PATENT DOCUMENT

Abstract:
An optical lens assembly with a filter member for image taking, sequentially arranged from an object side to an image side along an optical axis, comprises: a filter member and a lens assembly. The lens assembly is set at the object side of the filter member. The lens assembly comprises at least three lens elements with refractive powers, wherein at least two lens elements are made of plastic, and have at least one aspheric object-side surface or image-side surface. By such arrangements, the optical lens assembly with a filter member for image taking can have good chromatic aberration correction and reduce the total length for applications to electronic products such as cameras and mobile phones requiring high resolution.

Full Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to an optical lens assembly with a filter member for image taking, and more particularly to an optical lens assembly capable of filtering the infrared band of lights of a photographed object and then forming an image by an appropriately installed optical lens assembly in order to be applied to electronic products. 
         [0003]    2. Description of the Related Art 
         [0004]    As optical technology advances, image reception devices becomes increasingly popular, and a large number of electronic devices such as digital cameras, mobile phones, smart phones, notebook computers or tablet PCs, are disposed with the image reception devices. Therefore, users have higher demands on image reception devices for high quality and high resolution. 
         [0005]    In an image reception device, CCD or CMOS image sensors are generally used for capturing color images of a photographed object. Since the CCD and CMOS image sensor adopts a non-continuous image taking method, the response to color is different to human eyes. The main reason resides on that the transmittance of infrared is higher than the transmittance of visible lights, so that it is necessary to remove the portion of infrared that can be detected by the image sensor but not by human eyes, while adjusting the response to color in the range of visible lights, and the color of the image can match with the feeling of human eyes. Therefore, one of the main factors for an image reception device affecting the quality of the optical lens assembly for image taking is how to filter infrared light effectively without affecting the chromatic aberration and image aberration. To prevent the color shift problem occurred after receiving the infrared light by the CCD and CMOS image sensors, the prior art generally uses a low-pass light filter (LPLF) to absorb or reflect lights of the infrared band. As disclosed in U.S. patent and publication of US2009/0009888 and U.S. Pat. No. 7,513,704, the low-pass light filter is installed between a lens assembly and an image sensor if the infrared isolation filter is used. As disclosed in U.S. Pat. No. 6,754,009, and U.S. Pat. Publication No. 2008/0266670, an infrared isolation filter is installed between the lens assemblies. 
         [0006]    The low-pass light filter is generally made by plating a layer of coating onto blue glass or plate glass, wherein the blue glass is a glass manufactured by adding sodium oxide, magnesium oxide, calcium oxide, cobalt oxide and a small quantity of rare earth oxides for absorbing lights with a wavelength other than those of 400 nm-700 nm, or the light of different bands is adjusted according to the added metal oxide, so as to further improve the absorbing effect within the wavelength bands of UV and infrared light. The plate glass plated coating is a plated coating formed on the glass substrate for reflecting or absorbing the infrared light as disclosed in U.S. Pat. No. 7,166,359. 
         [0007]    At present, the low-pass filter technology has been applied to sunglasses, contact glasses or measurement instruments as disclosed in U.S. Pat. No. 5,149,182 or U.S. Pat. Publication No. US2008/0137030. For applications of the optical lens assembly for image taking as disclosed in U.S. Pat. No. 7,064,909 or U.S. Pat. Publication No. US2009/0097103, a two-lens or multi-lens optical lens assembly for image taking can be used for filtering influential lights such as the infrared light and can be manufactured easily, therefore, blue glass is used directly for manufacturing the lenses. Although this method can achieve the effect of filtering the infrared light, the blue glass changes the Abbe number of the lens elements which is unfavorable for correcting chromatic aberrations and image aberrations. 
         [0008]    In recent years, electronic products such as digital still cameras, mobile phone cameras and web cameras tend to be developed with a compact design, and users have an increasingly stricter requirement on the quality and the resolution of the image reception devices in addition to the requirement for a compact and low-cost image reception device, while meeting the requirement of an optical lens assembly for image taking with good aberration correction ability, high resolution and high image quality. The conventional optical lens assembly for image taking, an infrared isolation filter is installed, regardless of being installed between the lens assemblies or in front of the image sensor, the infrared isolation filter simply has the effect of filtering the infrared light, but the optical design of the optical lens assembly for image taking is still designed with a full spectrum, and thus the correction of the image, aberration, and color shift still require further improvements. If the infrared light is filtered and an image is formed at the image sensor, the optical design is still insufficient for a high-quality and high-resolution optical lens assembly for image taking. 
         [0009]    Therefore, the present invention provides a more practical design and uses a front IR-filter to adjust the rear focal length appropriately and shorten the whole optical system, and adopts an absorbing filter such as the blue glass or with a coating thereof to provide a good effect of absorbing lights at the infrared band to reduce the color shift effectively. Moreover, with the appropriate design of the optical lens assembly for image taking, the length of the optical lens assembly for image taking is shortened, and a high-resolution, high-quality aberration and color shift correction capability is provided for the application to electronic products. 
       SUMMARY OF THE INVENTION 
       [0010]    Therefore, it is a primary objective of the present invention to provide an optical lens assembly with a filter member for image taking, sequentially arranged from an object side to an image side comprising a filter member and a lens assembly, wherein the filter member can filter infrared light. The lens assembly is disposed at an image side of the filter member, and comprises at least three lens elements with refractive power, wherein at least two of the at least three lens elements are made of plastic with at least one aspheric object-side surface or image-side surface. 
         [0011]    On the other hand, the present invention provides an optical lens assembly with a filter member for image taking as described above, further comprising an image sensor at an image plane, wherein the filter member comprises a blue glass that can absorb infrared light. The transmittance of the incident light with wavelengths of 750 nm-1000 nm through the filter member is smaller than 20%. The lens assembly can comprises four lens elements with refractive power, sequentially arranged from the object side to the image side: the first lens element with positive refractive power having a convex object-side surface and a convex image-side surface, the second lens element with negative refractive power having a concave object-side surface and a concave image-side surface, the third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, and the fourth lens element with negative refractive power having a concave image-side surface, and at least one of the object-side surface and image-side surface thereof having at least one inflection point. The optical lens assembly satisfies one or more of the following relations: 
         [0000]        TTL /Img H&lt; 2.10;  (1)
 
         [0000]      0.2 &lt;f   3   /f&lt; 0.7;  (2)
 
         [0000]      −0.7 &lt;f   4   /f&lt;− 0.2;  (3)
 
         [0012]    wherein, TTL is an axial distance from the object-side surface of the first lens element to the image plane, ImgH is a half of the diagonal length of an effective photosensitive area of the image sensor, f is a focal length of the optical lens assembly with a filter member for image taking, f 3  is a focal length of the third lens element, and f 4  is a focal length of the fourth lens element. 
         [0013]    On the other hand, the present invention provides an optical lens assembly with a filter member for image taking as described above, further comprising a stop, wherein the lens assembly comprises five lens elements with refractive power, and more specifically, sequentially arranged from the object side to the image side: the first lens element with positive refractive power having a convex object-side surface, the second lens element with negative refractive power, the third lens element with negative refractive power, the fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface, the fifth lens element with negative refractive power having a concave image-side surface, and at least one of the object-side surface and image-side surface having at least one inflection point, and a filter member made of plate glass. The transmittance of the incident light with wavelengths of 750 nm-1000 nm is smaller than 20%; or the transmittance of the incident light with wavelengths of 450 nm-600 nm is greater than 60%, and the transmittance of the incident light with wavelengths of 750 nm-1000 nm is smaller than 10%. The optical lens assembly with a filter member for image taking satisfies one or more of the following relations: 
         [0000]      30 &lt;v   1   −v   2 &lt;40;  (4)
 
         [0000]      0.05 &lt;FT&lt; 0.50;  (5)
 
         [0000]      0&lt; D   1 &lt;0.60;  (6)
 
         [0000]      | f/f   3 |&lt;0.7;  (7)
 
         [0000]      0.7 &lt;SL/TTL&lt; 1.10;  (8)
 
         [0014]    wherein, v 1  is an Abbe number of the first lens element, v 2  is an Abbe number of the, FT is a central thickness (unit in mm) of the filter member, D 1  is an axial distance (unit in mm) between the filter member and the first lens element, f is a focal length of the optical lens assembly with a filter member for image taking, f 3  is a focal length of the third lens element, SL is an axial distance between the stop and the image plane, and TTL is an axial distance from the object-side surface of the first lens element to the image plane. 
         [0015]    Another objective of the present invention is to provide an optical lens assembly with a filter member for image taking, comprising a lens assembly and a filter member, wherein the lens assembly comprises at least three lens elements with refractive power, and at least two of the lens elements are made of plastic having at least one of aspheric object-side surface or image-side surface. The filter member comprises a blue glass that can absorb infrared light. 
         [0016]    On the other hand, the present invention provides an optical lens assembly with a filter member for image taking as described above, wherein the filter member is disposed at the object side of the lens assembly, and the present invention further comprises an image sensor at the image plane. The transmittance of the incident light with wavelengths of 750 nm-1000 nm is smaller than 20%; or additionally, the transmittance of the incident light with wavelengths of 450 nm-600 nm is greater than 60%, and the transmittance of the incident light with wavelengths of 750 nm-1000 nm is smaller than 10%. The optical lens assembly comprises four lens elements with refractive power, sequentially arranged from the object side to the image side: the filter member, the first lens element with positive refractive power having a convex object-side surface, the second lens element with negative refractive power, the third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, and the fourth lens element with negative refractive power having a concave image-side surface, and at least one of the object-side surface and image-side surface thereof having at least one inflection point. The optical lens assembly satisfies one or more of the following relations: 
         [0000]        TTL /Img H&lt; 2.10;  (1)
 
         [0000]      additionally, TTL /Img H&lt; 1.85;  (9)
 
         [0000]      0.05 &lt;FT&lt; 0.50;  (5)
 
         [0000]      0&lt; D   1 &lt;0.60;  (6)
 
         [0000]      30 &lt;v   1   −v   2 &lt;40;  (4)
 
         [0017]    wherein, TTL is an axial distance from the object-side surface of the first lens element to the image plane, ImgH is a half of the diagonal length of an effective photosensitive area of the image sensor, FT is a central thickness (unit in mm) of the filter member, D 1  is an axial distance (unit in mm) between the filter member and the first lens element, v 1  is an Abbe number of the first lens element, and v 2  is an Abbe number of the second lens element. 
         [0018]    On the other hand, the present invention provides an optical lens assembly with a filter member for image taking as described above, wherein the lens assembly comprises five lens elements with refractive power, and more specifically, sequentially arranged from the object side to the image side: the first lens element with positive refractive power having a convex object-side surface, the second lens element with negative refractive power, the third lens element with negative refractive power, the fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface, and the fifth lens element with negative refractive power having a concave image-side surface, and at least one of the object-side surface and image-side surface thereof having at least one inflection point. 
         [0019]    In the present invention, the aforementioned filter member and properly configured lens assembly are installed with an appropriate interval apart along the optical axis to achieve a good aberration correction and a more advantageous modulation transfer function (MTF) in the condition of a larger view angle. 
         [0020]    In the optical lens assembly with a filter member for image taking of the present invention, the filter member is disposed between the photographed object and the lens assembly to reduce the rear focal length of the system effectively, so as to reduce the total length of the optical lens assembly with a filter member for image taking. If the filter member is further made of blue glass capable of filtering infrared light, reduces the reflections effectively. In addition, the filter member made of blue glass can waive the secondary reflection to lower or eliminate the flare phenomenon effectively. 
         [0021]    In the optical lens assembly, the first lens element with positive refractive power provides a portion of required refractive power to facilitate shortening the total length of the optical system, and the second lens element with negative refractive power corrects the aberration produced by the lens elements with positive refractive power effectively. If the first lens element has a convex object-side surface, the view angle of the system can be enlarged, and the refraction of the incident light can be mild to avoid a too-large increase of the aberration, so that an appropriate installation can be achieved to favor the great view angle and aberration correction. 
         [0022]    Moreover, in the optical lens assembly with a filter member for image taking of the present invention, the third lens element with positive refractive power can effectively match with the first lens element with positive refractive power to reduce the error sensitivity of the system and facilitate the manufacture of the lenses. In addition, the fourth lens element with negative refractive power can provide a portion of negative refractive power to the optical lens assembly with a filter member for image taking to correct the high level aberration of the system effectively. In addition, if the third lens element has a convex image-side surface, the astigmatism and high level aberration can be corrected effectively. 
         [0023]    If the lens assembly is comprised of five lens elements with refractive power including a combination of the fourth lens element with negative refractive power and the fifth lens element with positive refractive power, the optical lens assembly with a filter member for image taking can have the telescopic effect, and the rear focal length can be shortened to reduce the total length. In addition, if the fourth lens element has a concave object-side surface and a convex image-side surface, the astigmatism and high level aberration can be corrected effectively. Further, the curvature at the periphery of the image-side surface of the fourth lens element is greater than the curvature at the middle, such that the light at the periphery of the system can be controlled to an angle and projected onto the image sensor, such that the light sensitivity of the system can be enhanced. 
         [0024]    In the optical lens assembly with a filter member for image taking of the present invention, a stop can provide a longer distance between an exit pupil of the optical lens assembly with a filter member for image taking and the image plane, and the light of an image can be projected directly and received by an image sensor to avoid dark corners and achieve the telecentric effect on the image side. In general, the telecentric effect can improve the brightness of the image plane and enhance the efficiency of receiving images by the CCD or CMOS image sensor. 
         [0025]    If an inflection point is designed at a position at the lens element nearest to the image plane, the light of an image can be guided with an angle out from the edges of the lens elements, such that the light of an image at the off-axis view angle is guided to the image sensor and received by the image sensor. If the lens element nearest to the image plane has a concave image-side surface, the principal point of the optical lens assembly with a filter member for image taking is situated at a position away from the image plane to facilitate shortening the total length of the optical system and miniaturizing the lens. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0026]      FIG. 1A  is a schematic view of an optical lens assembly with a filter member for image taking in accordance with the first preferred embodiment of the present invention; 
           [0027]      FIG. 1B  is a series of aberration curves of the first preferred embodiment of the present invention; 
           [0028]      FIG. 2A  is a schematic view of an optical lens assembly with a filter member for image taking in accordance with the second preferred embodiment of the present invention; 
           [0029]      FIG. 2B  is a series of aberration curves of the second preferred embodiment of the present invention; 
           [0030]      FIG. 3A  is a schematic view of an optical lens assembly with a filter member for image taking in accordance with the third preferred embodiment of the present invention; 
           [0031]      FIG. 3B  is a series of aberration curves of the third preferred embodiment of the present invention; 
           [0032]      FIG. 4A  is a schematic view of an optical lens assembly with a filter member for image taking in accordance with the fourth preferred embodiment of the present invention; 
           [0033]      FIG. 4B  is a series of aberration curves of the fourth preferred embodiment of the present invention; 
           [0034]      FIG. 5A  is a schematic view of an optical lens assembly with a filter member for image taking in accordance with the fifth preferred embodiment of the present invention; 
           [0035]      FIG. 5B  is a series of aberration curves of the fifth preferred embodiment of the present invention; 
           [0036]      FIG. 6A  is a schematic view of an optical lens assembly with a filter member for image taking in accordance with the sixth preferred embodiment of the present invention; and 
           [0037]      FIG. 6B  is a series of aberration curves of the sixth preferred embodiment of the present invention. 
           [0038]      FIG. 7A  is a schematic view of an optical lens assembly with a filter member for image taking in accordance with the seventh preferred embodiment of the present invention; 
           [0039]      FIG. 7B  is a series of aberration curves of the seventh preferred embodiment of the present invention; 
           [0040]      FIG. 8A  is a schematic view of an optical lens assembly with a filter member for image taking in accordance with the eighth preferred embodiment of the present invention; 
           [0041]      FIG. 8B  is a series of aberration curves of the eighth preferred embodiment of the present invention; and 
           [0042]      FIG. 9  is a transmittance reference curve of a filter member of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0043]    With reference to  FIG. 1A  for an optical lens assembly with a filter member for image taking of the present invention, the optical lens assembly with a filter member for image taking, sequentially arranged from an object side to an image side along an optical axis, comprises a filter member  101  and a lens assembly  10 . The filter member  101  is made of plate glass for filtering infrared light. The lens assembly  10 , sequentially arranged from the object side to the image side along the optical axis, comprises: the first lens element  110 , the second lens element  120 , the third lens element  130  and the fourth lens element  140 , wherein the first lens element  110  with positive refractive power has a convex object-side surface  111  and a convex image-side surface  112 ; the second lens element  120  with negative refractive power has a concave object-side surface  121  and a concave image-side surface  122 ; the third lens element  130  with positive refractive power has a concave object-side surface  131  and a convex image-side surface  132 ; the fourth lens element  140  with negative refractive power has a concave image-side surface  142 , and at least one of the object-side surface  141  and image-side surface  142  thereof has at least one inflection point. The optical lens assembly with a filter member for image taking further comprises a stop and an image sensor  180  at the image plane  170  for imaging a photographed object. The stop can be an aperture stop  102  which is a middle aperture stop disposed between the first lens element  110  and the second lens element  120 . 
         [0044]    With reference to  FIG. 4A  for an optical lens assembly with a filter member for image taking in accordance with the present invention besides, the optical lens assembly with a filter member for image taking, sequentially arranged from an object side to an image side along an optical axis, comprises: a filter member  401  and a lens assembly  40 . The filter member  401  is made of plate glass and filter infrared light. The lens assembly  40  sequentially arranged from the object side to the image side along the optical axis comprises: the first lens element  410 , the second lens element  420 , the third lens element  430 , the fourth lens element  440  and the fifth lens element  450 ; wherein the first lens element  410  with positive refractive power has a convex object-side surface  411 ; the second lens element  420  with negative refractive power; third lens element  430  with negative refractive power; fourth lens element  440  with positive refractive power has a concave object-side surface  441  and a convex image-side surface  442 ; and the fifth lens element  450  with negative refractive power has a concave image-side surface  452 , and at least one of the object-side surface  451  and the image-side surface  452  thereof has at least one inflection point. The optical lens assembly with a filter member for image taking further comprises a stop and an image sensor  480  at the image plane  470  for imaging a photographed object. The stop can be an aperture stop  402  which is a middle aperture stop disposed between the first lens element  410  and the second lens element  420 . 
         [0045]    With reference to  FIG. 7A  for an optical lens assembly with a filter member for image taking in accordance with the seventh preferred embodiment of the present invention, the optical lens assembly with a filter member for image taking sequentially arranged from an object side to an image side along an optical axis comprises: a filter member  701  and a lens assembly  70 . The filter member  701  is made of plate glass for filtering infrared light. The lens assembly  70 , sequentially arranged from an object side to an image side along an optical axis comprises: the first lens element  710 , the second lens element  720  and the third lens element  730 ; wherein the first lens element  710  comes with positive refractive power; the second lens element  720  comes with negative refractive power; the third lens element  730  comes with refractive power; and the optical lens assembly with a filter member for image taking further comprises an aperture stop  702  which is a front aperture stop installed between a photographed object and the first lens element  710  and an image sensor  780  installed at the image plane  770  for imaging the photographed object. 
         [0046]    In the optical lens assembly with a filter member for image taking of the present invention as mentioned above, if the lens element has a convex surface, it shows that the surface of the lens element in proximity to the optical axis is convex; if the surface of the lens element is concave, it shows that the surface of the lens element in proximity to the optical axis is concave. 
         [0047]    In the meantime, the aforementioned first lens element  110 , second lens element  120 , third lens element  130 , fourth lens element  140  and fifth lens element  150  come with aspheric optical surface in compliance with the aspherical surface formula as given in Equation (10): 
         [0000]    
       
         
           
             
               
                 
                   
                     X 
                      
                     
                       ( 
                       Y 
                       ) 
                     
                   
                   = 
                   
                     
                       
                         ( 
                         
                           
                             Y 
                             2 
                           
                           / 
                           R 
                         
                         ) 
                       
                       
                         1 
                         + 
                         
                           
                             ( 
                             
                               1 
                               - 
                               
                                 
                                   ( 
                                   
                                     1 
                                     + 
                                     K 
                                   
                                   ) 
                                 
                                  
                                 
                                   
                                     ( 
                                     
                                       Y 
                                       / 
                                       R 
                                     
                                     ) 
                                   
                                   2 
                                 
                               
                             
                             ) 
                           
                         
                       
                     
                     + 
                     
                       
                         ∑ 
                         i 
                       
                        
                       
                           
                       
                        
                       
                         
                           ( 
                           
                             A 
                             i 
                           
                           ) 
                         
                         · 
                         
                           ( 
                           
                             Y 
                             i 
                           
                           ) 
                         
                       
                     
                   
                 
               
               
                 
                   ( 
                   10 
                   ) 
                 
               
             
           
         
       
     
         [0048]    wherein, X is the relative height from a point on the aspherical surface with a distance Y from the optical axis to a tangent plane at the tip of the optical axis of the aspherical surface; 
         [0049]    Y is the distance between a point on the curve of the aspherical surface and the optical axis; 
         [0050]    K is the conic coefficient; and 
         [0051]    A i  is the i th  level aspherical surface coefficient. 
         [0052]    In the optical lens assembly with a filter member for image taking of the present invention, the first lens element  110 , second lens element  120 , third lens element  130 , fourth lens element  140 , and fifth lens element  150  can be spheric or aspheric surfaces, and if aspheric optical surfaces are adopted, then the radius of curvature of the optical surface can be used for changing the refractive power to reduce or eliminate aberrations, so as to decrease the number of lens elements used in the optical lens assembly with a filter member for image taking and shorten the total length of the optical lens assembly with a filter member for image capture. 
         [0053]    In the optical lens assembly with a filter member for image taking of the present invention, with the installation filter member  101 , the incident light with wavelengths of 750 nm˜1000 nm passing through the filter member  101  has a transmittance smaller than 20%; or the incident light with wavelengths of 450 nm˜600 nm passing through the filter member  101  has a transmittance greater than 60%, and the incident light with wavelengths of 750 nm˜1000 nm has a transmittance smaller than 10% to reduce the color shift effectively. 
         [0054]    If the relation (1) is satisfied, the total length TTL of the optical lens assembly with a filter member for image taking can be reduced effectively, such that that a larger effective pixel range of the image sensor can be achieved within the same total length TTL. If the relations (2) and (3) are satisfied, in other words, the refractive powers are allocated appropriately among the focal length f of the optical lens assembly with a filter member for image taking, the focal length f 3  of the third lens element  130 , and the focal length f t  of the fourth lens element  140 , the sensitivity of the optical lens assembly with a filter member for image taking can be controlled and lowered to correct high level aberrations. 
         [0055]    In the optical lens assembly with a filter member for image taking of the present invention, if the relation (4) is satisfied, such that the difference of the Abbe number v 1  of the first lens element  110  and the Abbe number v 2  of the second lens element  120  falls within an appropriate range, the chromatic aberration produced by the first lens element  110  and the second lens element  120  can be corrected effectively, and the chromatic aberration compensation capability of the second lens  120  can be enhanced. If the central thickness FT of the filter member  101  is controlled (to the relation 5), the effect of absorbing the infrared band of the incident light can be adjusted appropriately, and the filter member  101  has an appropriate thickness to facilitate shortening the total length of the optical lens assembly with a filter member for image taking. 
         [0056]    If the axial distance D 1  between the filter member  101  and the first lens element  110  is limited (to the relation 6), the total length of the optical lens assembly with a filter member for image taking can be adjusted appropriately; and if the relation (8) is satisfied, a good balance between the telecentric property of the optical lens assembly with a filter member for image taking and a wider view angle can be obtained, and the total length of the optical lens assembly with a filter member for image taking can be shortened effectively. 
         [0057]    The optical lens assembly with a filter member for image taking of the present invention is described by preferred embodiments and related drawings in details as follows. 
       First Preferred Embodiment 
       [0058]    With reference to  FIGS. 1A and 1B  for a schematic view of an optical lens assembly with a filter member for image taking and a series of aberration curves in accordance with the first preferred embodiment of the present invention respectively, the optical lens assembly with a filter member for image taking primarily comprises four lens elements, an aperture stop  102  and a filter member  101 . More specifically, the optical lens assembly with a filter member for image taking, sequentially arranged from an object side to an image side along an optical axis, comprises: the filter member  101  made of plate blue glass for filtering infrared light; the plastic first lens element  110  with positive refractive power having a convex object-side surface  111  and a convex image-side surface  112 , and both object-side surface  111  and image-side surface  112  thereof being aspheric; the aperture stop  102 ; the plastic second lens element  120  with negative refractive power having a concave object-side surface  121  and a concave image-side surface  122 , and both object-side surface  121  and image-side surface  122  being aspheric; the plastic third lens element  130  with positive refractive power having a concave object-side surface  131  and a convex image-side surface  132 , and both object-side surface  131  and image-side surface  132  thereof being aspheric; the plastic fourth lens element  140  with negative refractive power having a concave object-side surface  141  and a concave image-side surface  142 , both object-side surface  141  and image-side surface  142  thereof being aspheric, and at least one of the object-side surface  141  and image-side surface  142  thereof having at least one inflection point; an image sensor  180  at an image plane  170 . With a combination of the lens assembly  10  having four lens elements, the aperture stop  102  and the filter member  101 , an image of a photographed object can be formed onto the image sensor  180 . 
         [0000]    
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 1 
               
             
             
               
                   
               
               
                 Optical data of this preferred embodiment 
               
               
                 f = 3.21 mm, Fno = 2.60, HFOV = 35.0 deg. 
               
             
          
           
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 IR-filter 
                 Plano 
                 0.300 
                 Glass 
                 1.527 
                 64.2 
                 — 
               
               
                 2 
                   
                 Plano 
                 0.300 
                 (Blue 
               
               
                   
                   
                   
                   
                 Glass) 
               
               
                 3 
                 Lens 1 
                  1.457340 (ASP) 
                 0.478 
                 Plastic 
                 1.544 
                 55.9 
                 1.97 
               
               
                 4 
                   
                 −3.553800 (ASP) 
                 −0.040 
               
               
                 5 
                 Ape. Stop 
                 Plano 
                 0.135 
               
               
                 6 
                 Lens 2 
                 −3.469100 (ASP) 
                 0.250 
                 Plastic 
                 1.634 
                 23.8 
                 −3.46 
               
               
                 7 
                   
                  6.141500 (ASP) 
                 0.565 
               
               
                 8 
                 Lens 3 
                 −3.043300 (ASP) 
                 1.235 
                 Plastic 
                 1.544 
                 55.9 
                 0.86 
               
               
                 9 
                   
                 −0.462650 (ASP) 
                 0.050 
               
               
                 10 
                 Lens 4 
                 −50.000000 (ASP)  
                 0.320 
                 Plastic 
                 1.535 
                 56.3 
                 −0.70 
               
               
                 11 
                   
                  0.377830 (ASP) 
                 0.500 
               
               
                 12 
                 Image 
                 Plano 
                 0.511 
               
               
                 13 
                   
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm. ASP stands for aspherical surfaces. 
               
             
          
         
       
     
         [0059]    The optical data of this preferred embodiment are listed in Table 1, wherein the object-side surfaces and the image-side surfaces of the first lens element  110  to the fourth lens element  140  comply with the aspherical surface formula as given in Equation (10), and their aspheric coefficients are listed in Table 2 as follows: 
         [0000]    
       
         
               
             
               
               
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
               
                 Aspheric coefficients of this preferred embodiment 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 3 
                 4 
                 6 
                 7 
               
               
                   
               
               
                 k = 
                 −1.07847E+01 
                 1.00000E+00 
                 0.00000E+00 
                 −6.64801E+00 
               
               
                 A4 = 
                  4.01933E−01 
                 1.48985E−01 
                 5.15964E−01 
                  3.86858E−01 
               
               
                 A6 = 
                 −8.57770E−01 
                 −3.90278E−01  
                 −1.52131E+00  
                 −7.44876E−01 
               
               
                 A8 = 
                  1.26682E+00 
                 −9.12930E−01  
                 4.55162E+00 
                  1.87321E+00 
               
               
                 A10 = 
                 −1.44703E+00 
                 3.39815E+00 
                 −1.45374E+01  
                 −3.87556E+00 
               
               
                 A12 = 
                  1.72092E−01 
                 −5.65123E+00  
                 2.92496E+01 
                  5.18075E+00 
               
               
                 A14 = 
                 −3.71327E−01 
                 4.08908E+00 
                 −2.22715E+01  
                 −1.93765E+00 
               
               
                   
               
               
                 Surface # 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                 −1.00000E+01  
                 −5.32044E+00 
                 −1.00000E+01 
                 −5.95095E+00 
               
               
                 A4 = 
                 3.91830E−02 
                 −4.45877E−01 
                 −3.82515E−01 
                 −2.20284E−01 
               
               
                 A6 = 
                 −5.78520E−01  
                  6.35459E−01 
                  2.03460E−01 
                  1.54006E−01 
               
               
                 A8 = 
                 7.32523E−01 
                 −7.15533E−01 
                  3.15344E−03 
                 −7.76986E−02 
               
               
                 A10 = 
                 2.56081E−01 
                  4.76345E−01 
                 −3.30044E−02 
                  2.48979E−02 
               
               
                 A12 = 
                 −1.40816E+00  
                 −1.36620E−01 
                  1.07782E−02 
                 −4.56601E−03 
               
               
                 A14 = 
                 9.36726E−01 
                  1.16735E−02 
                 −1.14342E−03 
                  3.58425E−04 
               
               
                   
               
             
          
         
       
     
         [0060]    With reference to Table 1 and the series of aberration curves as shown in  FIG. 1B  for the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment, the focal length of the optical lens assembly for image capture is f=3.21 (mm), the overall aperture value (f-number) of the optical lens assembly for image capture is Fno=2.60, the half of maximum view angle is HFOV=35.0°. After the optical data of this preferred embodiment are calculated and derived, the optical lens assembly satisfies related relations as shown in Table 3 below, and the related symbols have been described above and thus will not be described again. 
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 3 
               
             
             
               
                   
               
               
                 Data of related relations of this preferred embodiment 
               
             
          
           
               
                   
                 Relation 
                 Data 
               
               
                   
                   
               
             
          
           
               
                   
                 v 1 -v 2   
                 32.1 
               
               
                   
                 FT 
                 0.30 
               
               
                   
                 D 1   
                 0.30 
               
               
                   
                 f 3 /f 
                 0.27 
               
               
                   
                 |f/f 3 | 
                 3.74 
               
               
                   
                 f 4 /f 
                 0.22 
               
               
                   
                 SL/TTL 
                 0.89 
               
               
                   
                 TTL/ImgH 
                 1.77 
               
               
                   
                   
               
             
          
         
       
     
         [0061]    According to the optical data as shown in Table 1 and the series of aberration curves as shown in  FIG. 1B , the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment of the present invention provides good correction results in aspects of the longitudinal spherical aberration, astigmatic field curving, and distortion. 
       Second Preferred Embodiment 
       [0062]    With reference to  FIGS. 2A and 2B  for a schematic view of an optical lens assembly with a filter member for image taking and a series of aberration curves in accordance with the second preferred embodiment of the present invention respectively, the optical lens assembly with a filter member for image taking mainly comprises four lens elements, an aperture stop  202  and a filter member  201 . More specifically, the optical lens assembly with a filter member for image taking, sequentially arranged from an object side to an image side along an optical axis, comprises: the filter member  201  made of plate blue glass for filtering infrared light; the plastic first lens element  210  with positive refractive power having a convex object-side surface  211  and a convex image-side surface  212 , and both object-side surface  211  and image-side surface  212  thereof being aspheric; the aperture stop  202 ; the plastic second lens element  220  with negative refractive power having a concave object-side surface  221  and a concave image-side surface  222 , and both object-side surface  221  and image-side surface  222  being aspheric; the plastic third lens element  230  with positive refractive power having a concave object-side surface  231  and a convex image-side surface  232 , and both object-side surface  231  and image-side surface  232  thereof being aspheric; the plastic fourth lens element  240  with negative refractive power having a convex object-side surface  241  and a concave image-side surface  242 , both object-side surface  241  and image-side surface  242  thereof being aspheric, and at least one of the object-side surface  241  and image-side surface  242  thereof having at least one inflection point; an image sensor  280  at an image plane  270 . With a combination of the lens assembly  20  having four lens elements, the aperture stop  202  and the filter member  201 , an image of a photographed object can be formed onto the image sensor  280 . 
         [0000]    
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 4 
               
             
             
               
                   
               
               
                 Optical data of this preferred embodiment 
               
               
                 f = 3.85 mm, Fno = 2.82, HFOV = 30.1 deg. 
               
             
          
           
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 IR-filter 
                 Plano 
                 0.300 
                 Glass 
                 1.527 
                 64.2 
                 — 
               
               
                 2 
                   
                 Plano 
                 0.050 
                 (Blue 
               
               
                   
                   
                   
                   
                 Glass) 
               
               
                 3 
                 Lens 1 
                 1.648970 (ASP) 
                 0.610 
                 Plastic 
                 1.544 
                 55.9 
                 2.48 
               
               
                 4 
                   
                 −6.453500 (ASP)  
                 −0.012 
               
               
                 5 
                 Ape. Stop 
                 Plano 
                 0.166 
               
               
                 6 
                 Lens 2 
                 −10.655100 (ASP)  
                 0.380 
                 Plastic 
                 1.632 
                 23.4 
                 −3.64 
               
               
                 7 
                   
                 2.978290 (ASP) 
                 0.597 
               
               
                 8 
                 Lens 3 
                 −1.745370 (ASP)  
                 0.845 
                 Plastic 
                 1.544 
                 55.9 
                 2.42 
               
               
                 9 
                   
                 −0.878410 (ASP)  
                 0.050 
               
               
                 10 
                 Lens 4 
                 2.713550 (ASP) 
                 0.450 
                 Plastic 
                 1.530 
                 55.8 
                 −3.13 
               
               
                 11 
                   
                 0.970350 (ASP) 
                 0.533 
               
               
                 12 
                 Image 
                 Plano 
                 1.107 
               
               
                 13 
                   
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm. ASP stands for aspherical surfaces. 
               
             
          
         
       
     
         [0063]    The optical data of this preferred embodiment are listed in Table 4, wherein the object-side surfaces and the image-side surfaces of the first lens element  210  to the fourth lens element  240  comply with the aspherical surface formula as given in Equation (10), and their aspheric coefficients are listed in Table 5 as follows: 
         [0000]    
       
         
               
             
               
               
               
               
               
             
           
               
                 TABLE 5 
               
               
                   
               
               
                 Aspheric coefficients of this preferred embodiment 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 3 
                 4 
                 6 
                 7 
               
               
                   
               
               
                 k = 
                 −3.67829E−01 
                 3.20849E+01 
                 −1.00000E+00 
                 6.76856E−01 
               
               
                 A4 = 
                  3.39435E−03 
                 2.67772E−02 
                  1.03261E−01 
                 1.39908E−01 
               
               
                 A6 = 
                 −7.17988E−02 
                 −4.77291E−02  
                 −1.38113E−01 
                 −7.40642E−02  
               
               
                 A8 = 
                  1.36696E−01 
                 −2.10480E−01  
                 −9.91399E−02 
                 5.43810E−02 
               
               
                 A10 = 
                 −1.92463E−01 
                 1.81353E−01 
                  1.47911E−01 
                 0.00000E+00 
               
               
                 A12 = 
               
               
                 A14 = 
               
               
                   
               
               
                 Surface # 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                 −2.88540E−01 
                 −1.04215E+00 
                 −1.00000E+00 
                 −5.58851E+00 
               
               
                 A4 = 
                 −1.93299E−03 
                  1.32233E−01 
                 −3.27788E−01 
                 −1.91802E−01 
               
               
                 A6 = 
                 −1.66772E−01 
                 −3.44376E−01 
                  1.35071E−01 
                  9.47546E−02 
               
               
                 A8 = 
                 −3.06011E−01 
                  3.14209E−01 
                 −3.29903E−02 
                 −3.67465E−02 
               
               
                 A10 = 
                  6.78832E−01 
                 −1.87695E−01 
                  1.39907E−02 
                  6.95813E−03 
               
               
                 A12 = 
                  2.74215E−01 
                  6.03733E−03 
                 −4.53802E−03 
                  4.19682E−04 
               
               
                 A14 = 
                 −1.64570E+00 
                  7.54876E−02 
                 −2.28692E−03 
                 −4.94227E−04 
               
               
                 A16 = 
                  1.02935E+00 
                 −3.99526E−02 
                  9.71196E−04 
                  6.39773E−05 
               
               
                   
               
             
          
         
       
     
         [0064]    With reference to Table 4 and the series of aberration curves as shown in  FIG. 2B  for the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment, the focal length of the optical lens assembly for image capture is f=3.85 (mm), the overall aperture value (f-number) of the optical lens assembly for image capture is Fno=2.82, the half of maximum view angle is HFOV=30.1°. After the optical data of this preferred embodiment are calculated and derived, the optical lens assembly satisfies related relations as shown in Table 6 below, and the related symbols have been described above and thus will not be described again. 
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 6 
               
             
             
               
                   
               
               
                 Data of related relations of this preferred embodiment 
               
             
          
           
               
                   
                 Relation 
                 Data 
               
               
                   
                   
               
             
          
           
               
                   
                 v 1 -v 2   
                 32.5 
               
               
                   
                 FT 
                 0.30 
               
               
                   
                 D 1   
                 0.05 
               
               
                   
                 f 3 /f 
                 0.63 
               
               
                   
                 |f/f 3 | 
                 1.59 
               
               
                   
                 f 4 /f 
                 −0.81 
               
               
                   
                 SL/TTL 
                 0.87 
               
               
                   
                 TTL/ImgH 
                 2.11 
               
               
                   
                   
               
             
          
         
       
     
         [0065]    According to the optical data as shown in Table 4 and the series of aberration curves as shown in  FIG. 2B , the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment of the present invention provides good correction results in aspects of the longitudinal spherical aberration, astigmatic field curving, and distortion. 
       Third Preferred Embodiment 
       [0066]    With reference to  FIGS. 3A and 3B  for a schematic view of an optical lens assembly with a filter member for image taking and a series of aberration curves in accordance with the third preferred embodiment of the present invention respectively, the optical lens assembly with a filter member for image taking primarily comprises four lens elements, an aperture stop  302  and a filter member  301 . More specifically, the optical lens assembly with a filter member for image taking, sequentially arranged from an object side to an image side along an optical axis, comprises: the filter member  301  made of plate blue glass for filtering infrared light; the aperture stop  302 ; the plastic first lens element  310  with positive refractive power having a convex object-side surface  311  and a concave image-side surface  312 , and both object-side surface  311  and image-side surface  312  thereof being aspheric; the plastic second lens element  320  with negative refractive power having a concave object-side surface  321  and a concave image-side surface  322 , and both object-side surface  321  and image-side surface  322  being aspheric; the plastic third lens element  330  with positive refractive power having a concave object-side surface  331  and a convex image-side surface  332 , and both object-side surface  331  and image-side surface  332  thereof being aspheric; the plastic fourth lens element  340  with negative refractive power having a convex object-side surface  341  and a concave image-side surface  342 , both object-side surface  341  and image-side surface  342  thereof being aspheric, and at least one of the object-side surface  341  and image-side surface  342  thereof having at least one inflection point; an image sensor  380  at an image plane  370 . With a combination of the lens assembly  30  having four lens elements, the aperture stop  302  and the filter member  301 , an image of a photographed object can be formed onto the image sensor  380 . 
         [0000]    
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 7 
               
             
             
               
                   
               
               
                 Optical data of this preferred embodiment 
               
               
                 f = 3.31 mm, Fno = 2.82, HFOV = 34.2 deg. 
               
             
          
           
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 IR-filter 
                 Plano 
                 0.300 
                 Glass 
                 1.527 
                 64.2 
                 — 
               
               
                 2 
                   
                 Plano 
                 0.189 
                 (Blue 
               
               
                   
                   
                   
                   
                 Glass) 
               
               
                 3 
                 Ape. Stop 
                 Plano 
                 −0.139 
               
               
                 4 
                 Lens 1 
                 1.108640 (ASP) 
                 0.552 
                 Plastic 
                 1.543 
                 56.5 
                 2.28 
               
               
                 5 
                   
                 8.781800 (ASP) 
                 0.124 
               
               
                 6 
                 Lens 2 
                 −40.314100 (ASP)  
                 0.315 
                 Plastic 
                 1.632 
                 23.4 
                 −4.19 
               
               
                 7 
                   
                 2.841350 (ASP) 
                 0.419 
               
               
                 8 
                 Lens 3 
                 −1.722800 (ASP)  
                 0.695 
                 Plastic 
                 1.543 
                 56.5 
                 2.46 
               
               
                 9 
                   
                 −0.859470 (ASP)  
                 0.061 
               
               
                 10 
                 Lens 4 
                 6.736100 (ASP) 
                 0.555 
                 Plastic 
                 1.530 
                 55.8 
                 −2.47 
               
               
                 11 
                   
                 1.066010 (ASP) 
                 0.346 
               
               
                 12 
                 Image 
                 Plano 
                 0.734 
               
               
                 13 
                   
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm. ASP stands for aspherical surfaces. 
               
             
          
         
       
     
         [0067]    The optical data of this preferred embodiment are listed in Table 7, wherein the object-side surfaces and the image-side surfaces of the first lens element  310  to the fourth lens element  340  comply with the aspherical surface formula as given in Equation (10), and their aspheric coefficients are listed in Table 8 as follows: 
         [0000]    
       
         
               
             
               
               
               
               
               
             
           
               
                 TABLE 8 
               
               
                   
               
               
                 Aspheric coefficients of this preferred embodiment 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 4 
                 5 
                 6 
                 7 
               
               
                   
               
               
                 k = 
                 −7.84671E−02 
                 5.86239E+01 
                 −7.18107E+01 
                 2.73933E+00 
               
               
                 A4 = 
                  4.29489E−02 
                 4.55646E−02 
                  9.10820E−02 
                 2.04694E−01 
               
               
                 A6 = 
                 −7.95509E−02 
                 −5.23841E−01  
                 −1.05545E+00 
                 −2.71891E−01  
               
               
                 A8 = 
                  4.06059E−01 
                 1.39097E+00 
                  1.63418E+00 
                 1.86590E−01 
               
               
                 A10 = 
                 −5.45071E−01 
                 −4.00419E+00  
                 −1.43934E+00 
                 2.27613E−01 
               
               
                 A12 = 
                   
                   
                 −5.38754E+00 
               
               
                   
               
               
                 Surface # 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                 −8.04563E−01 
                 −1.64642E+00 
                 −8.84235E+02 
                 −8.61061E+00 
               
               
                 A4 = 
                  4.78653E−02 
                  7.78954E−02 
                 −1.08715E−01 
                 −1.28647E−01 
               
               
                 A6 = 
                  7.93853E−02 
                 −7.06319E−03 
                  3.61741E−02 
                  3.94249E−02 
               
               
                 A8 = 
                 −3.33975E−01 
                 −5.00295E−02 
                 −1.41644E−04 
                 −9.68117E−03 
               
               
                 A10 = 
                 −2.17938E−01 
                 −3.70110E−02 
                  4.06906E−05 
                  6.39029E−04 
               
               
                 A12 = 
                  4.88065E−01 
                  5.18394E−02 
                 −4.27372E−04 
                  8.20457E−05 
               
               
                 A14 = 
                  8.38250E−01 
                  3.77629E−02 
                 −1.22121E−05 
                 −3.53273E−06 
               
               
                 A16 = 
                 −1.26623E+00 
                 −3.26736E−02 
                  1.84618E−05 
                 −5.45623E−07 
               
               
                   
               
             
          
         
       
     
         [0068]    With reference to Table 7 and the series of aberration curves as shown in  FIG. 3B  for the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment, the focal length of the optical lens assembly for image capture is f=3.31 (mm), the overall aperture value (f-number) of the optical lens assembly for image capture is Fno=2.82, the half of maximum view angle is HFOV=34.2°. After the optical data of this preferred embodiment are calculated and derived, the optical lens assembly satisfies related relations as shown in Table 9 below, and the related symbols have been described above and thus will not be described again. 
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 9 
               
             
             
               
                   
               
               
                 Data of related relations of this preferred embodiment 
               
             
          
           
               
                   
                 Relation 
                 Data 
               
               
                   
                   
               
             
          
           
               
                   
                 v 1 -v 2   
                 33.1 
               
               
                   
                 FT 
                 0.30 
               
               
                   
                 D 1   
                 0.05 
               
               
                   
                 f 3 /f 
                 0.74 
               
               
                   
                 |f/f 3 | 
                 1.35 
               
               
                   
                 f 4 /f 
                 −0.75 
               
               
                   
                 SL/TTL 
                 0.96 
               
               
                   
                 TTL/ImgH 
                 1.68 
               
               
                   
                   
               
             
          
         
       
     
         [0069]    According to the optical data as shown in Table 7 and the series of aberration curves as shown in  FIG. 3B , the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment of the present invention provides good correction results in aspects of the longitudinal spherical aberration, astigmatic field curving, and distortion. 
       Fourth Preferred Embodiment 
       [0070]    With reference to  FIGS. 4A and 4B  for a schematic view of an optical lens assembly with a filter member for image taking and a series of aberration curves in accordance with the fourth preferred embodiment of the present invention respectively, the optical lens assembly with a filter member for image taking mainly comprises five lens elements, an aperture stop  402  and a filter member  401 . More specifically, the optical lens assembly with a filter member for image taking, sequentially arranged from an object side to an image side along an optical axis, comprises: the filter member  401  made of plate blue glass for filtering infrared light; the plastic first lens element  410  with positive refractive power having a convex object-side surface  411  and a convex image-side surface  412 , and both object-side surface  411  and image-side surface  412  thereof being aspheric; the aperture stop  402 ; the plastic second lens element  420  with negative refractive power having a concave object-side surface  421  and a concave image-side surface  422 , and both object-side surface  421  and image-side surface  422  being aspheric; the plastic third lens element  430  with negative refractive power having a convex object-side surface  431  and a concave image-side surface  432 , and both object-side surface  431  and image-side surface  432  thereof being aspheric; the plastic fourth lens element  440  with positive refractive power having a concave object-side surface  441  and a convex image-side surface  442 , and both object-side surface  441  and image-side surface  442  thereof being aspheric; the plastic fifth lens element  450  with negative refractive power having a convex object-side surface  451  and a concave image-side surface  452 , both object-side surface  451  and image-side surface  452  thereof being aspheric, and at least one of the object-side surface  451  and image-side surface  452  thereof having at least one inflection point; an image sensor  480  at an image plane  470 . With a combination of the lens assembly  40  having five lens elements, the aperture stop  402  and the filter member  401 , an image of a photographed object can be formed onto the image sensor  480 . 
         [0000]    
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 10 
               
             
             
               
                   
               
               
                 Optical data of this preferred embodiment 
               
               
                 f = 3.61 mm, Fno = 2.40, HFOV = 37.5 deg. 
               
             
          
           
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 IR-filter 
                 Plano 
                 0.210 
                 Glass 
                 1.527 
                 64.2 
                 — 
               
               
                 2 
                   
                 Plano 
                 0.300 
                 (Blue 
               
               
                   
                   
                   
                   
                 Glass) 
               
               
                 3 
                 Lens 1 
                 1.703230 (ASP) 
                 0.511 
                 Plastic 
                 1.544 
                 55.9 
                 2.85 
               
               
                 4 
                   
                 −15.711400 (ASP)  
                 −0.005 
               
               
                 5 
                 Ape. Stop 
                 Plano 
                 0.061 
               
               
                 6 
                 Lens 2 
                 −24.254200 (ASP)  
                 0.230 
                 Plastic 
                 1.640 
                 23.3 
                 −7.43 
               
               
                 7 
                   
                 5.932100 (ASP) 
                 0.537 
               
               
                 8 
                 Lens 3 
                 283.270800 (ASP)  
                 0.230 
                 Plastic 
                 1.640 
                 23.3 
                 −10.17 
               
               
                 9 
                   
                 6.356700 (ASP) 
                 0.214 
               
               
                 10 
                 Lens 4 
                 −3.696400 (ASP)  
                 1.054 
                 Plastic 
                 1.544 
                 55.9 
                 1.73 
               
               
                 11 
                   
                 −0.827400 (ASP)  
                 0.043 
               
               
                 12 
                 Lens 5 
                 29.180000 (ASP)  
                 0.718 
                 Plastic 
                 1.535 
                 56.3 
                 −1.84 
               
               
                 13 
                   
                 0.941970 (ASP) 
                 0.700 
               
               
                 14 
                 Image 
                 Plano 
                 0.506 
               
               
                 15 
                   
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm. ASP stands for aspherical surfaces. 
               
             
          
         
       
     
         [0071]    The optical data of this preferred embodiment are listed in Table 10, wherein the object-side surfaces and the image-side surfaces of the first lens element  410  to the fifth lens element  450  comply with the aspheric surface formula as given in Equation (10), and their aspheric coefficients are listed in Table 11 as follows: 
         [0000]    
       
         
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 11 
               
               
                   
               
               
                 Aspheric coefficients of this preferred embodiment 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 3 
                 4 
                 6 
                 7 
                 8 
               
               
                   
               
               
                 k = 
                 −6.47951E+00 
                 8.96701E+01 
                  9.00000E+01 
                 −1.40981E+02 
                 −9.00000E+01 
               
               
                 A4 = 
                  1.56786E−01 
                 −9.59932E−02  
                 −1.11035E−01 
                  2.88802E−03 
                 −3.67483E−01 
               
               
                 A6 = 
                 −1.66299E−01 
                 1.99200E−01 
                  3.11421E−01 
                 −3.42378E−03 
                 −1.28183E−01 
               
               
                 A8 = 
                  2.11446E−01 
                 −2.89805E−01  
                 −1.96637E−01 
                  1.74099E−01 
                  4.00731E−01 
               
               
                 A10 = 
                 −3.14829E−01 
                 1.24517E−01 
                 −2.46469E−01 
                 −4.87423E−01 
                 −7.99676E−01 
               
               
                 A12 = 
                  1.85664E−01 
                 2.22553E−01 
                  6.69759E−01 
                  5.05450E−01 
                  6.16361E−01 
               
               
                 A14 = 
                 −3.15370E−02 
                 −2.18273E−01  
                 −2.83192E−01 
                 −1.04265E−01 
               
               
                   
               
               
                 Surface # 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k = 
                 −8.97928E+01  
                 6.82136E+00 
                 −3.36695E+00 
                 −9.00000E+01 
                 −6.09198E+00 
               
               
                 A4 = 
                 −2.28216E−01  
                 4.07812E−02 
                 −1.52841E−01 
                 −5.61676E−02 
                 −6.01281E−02 
               
               
                 A6 = 
                 8.02348E−03 
                 2.14830E−02 
                  1.30576E−01 
                 −6.37514E−03 
                  2.09422E−02 
               
               
                 A8 = 
                 3.49795E−02 
                 −1.57145E−01  
                 −1.09155E−01 
                  7.86252E−03 
                 −6.66533E−03 
               
               
                 A10 = 
                 5.17487E−03 
                 2.45062E−01 
                  5.76844E−02 
                 −9.69980E−04 
                  1.25676E−03 
               
               
                 A12 = 
                 1.70663E−02 
                 −1.48296E−01  
                 −1.28546E−02 
                 −9.42627E−05 
                 −1.28562E−04 
               
               
                 A14 = 
                   
                 3.35300E−02 
                  7.60327E−04 
                  1.80094E−05 
                  5.58240E−06 
               
               
                   
               
             
          
         
       
     
         [0072]    With reference to Table 10 and the series of aberration curves as shown in  FIG. 4B  for the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment, the focal length of the optical lens assembly for image capture is f=3.61 (mm), the overall aperture value (f-number) of the optical lens assembly for image capture is Fno=2.40, the half of maximum view angle is HFOV=37.5°. After the optical data of this preferred embodiment are calculated and derived, the optical lens assembly satisfies related relations as shown in Table 12 below, and the related symbols have been described above and thus will not be described again. 
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 12 
               
             
             
               
                   
               
               
                 Data of related relations of this preferred embodiment 
               
             
          
           
               
                   
                 Relation 
                 Data 
               
               
                   
                   
               
             
          
           
               
                   
                 v 1 -v 2   
                 32.6 
               
               
                   
                 FT 
                 0.21 
               
               
                   
                 D 1   
                 0.30 
               
               
                   
                 f 3 /f 
                 −2.82 
               
               
                   
                 |f/f 3 | 
                 0.36 
               
               
                   
                 f 4 /f 
                 0.48 
               
               
                   
                 SL/TTL 
                 0.90 
               
               
                   
                 TTL/ImgH 
                 1.71 
               
               
                   
                   
               
             
          
         
       
     
         [0073]    According to the optical data as shown in Table 10 and the series of aberration curves as shown in  FIG. 4B , the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment of the present invention provides good correction results in aspects of the longitudinal spherical aberration, astigmatic field curving, and distortion. 
       Fifth Preferred Embodiment 
       [0074]    With reference to  FIGS. 5A and 5B  for a schematic view of an optical lens assembly with a filter member for image taking and a series of aberration curves in accordance with the fifth preferred embodiment of the present invention respectively, the optical lens assembly with a filter member for image taking comprises five lens elements, an aperture stop  502  and a filter member  501 . More specifically, the optical lens assembly with a filter member for image taking, sequentially arranged from an object side to an image side along an optical axis, comprises: the filter member  501  made of plate blue glass for filtering infrared light; the aperture stop  502 ; the plastic first lens element  510  with positive refractive power having a convex object-side surface  511  and a convex image-side surface  512 , and both object-side surface  511  and image-side surface  512  thereof being aspheric; the plastic second lens element  520  with negative refractive power having a concave object-side surface  521  and a concave image-side surface  522 , and both object-side surface  521  and image-side surface  522  being aspheric; the plastic third lens element  530  with positive refractive power having a convex object-side surface  531  and a concave image-side surface  532 , and both object-side surface  531  and image-side surface  532  thereof being aspheric; the plastic fourth lens element  540  with positive refractive power having a concave object-side surface  541  and a convex image-side surface  542 , and both object-side surface  541  and image-side surface  542  thereof being aspheric; the plastic fifth lens element  550  with negative refractive power having a concave object-side surface  551  and a concave image-side surface  552 , both object-side surface  551  and image-side surface  552  thereof being aspheric, and at least one of the object-side surface  551  and image-side surface  552  thereof having at least one inflection point; an image sensor  580  at an image plane  570 . With a combination of the lens assembly  50  having five lens elements, the aperture stop  502  and the filter member  501 , an image of a photographed object can be formed onto the image sensor  580 . 
         [0000]    
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 13 
               
             
             
               
                   
               
               
                 Optical data of this preferred embodiment 
               
               
                 f = 4.39 mm, Fno = 2.52, HFOV = 33.1 deg. 
               
             
          
           
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 IR-filter 
                 Plano 
                 0.200 
                 Glass 
                 1.527 
                 64.2 
                 — 
               
               
                 2 
                   
                 Plano 
                 0.300 
                 (Blue 
               
               
                   
                   
                   
                   
                 Glass) 
               
               
                 3 
                 Ape. Stop 
                 Plano 
                 −0.210 
               
               
                 4 
                 Lens 1 
                 1.679410 (ASP) 
                 0.671 
                 Plastic 
                 1.544 
                 55.9 
                 2.89 
               
               
                 5 
                   
                 −21.604500 (ASP)  
                 0.132 
               
               
                 6 
                 Lens 2 
                 −35.328700 (ASP)  
                 0.277 
                 Plastic 
                 1.640 
                 23.3 
                 −4.52 
               
               
                 7 
                   
                 3.155600 (ASP) 
                 0.411 
               
               
                 8 
                 Lens 3 
                 11.212300 (ASP)  
                 0.297 
                 Plastic 
                 1.634 
                 23.8 
                 29.41 
               
               
                 9 
                   
                 27.838500 (ASP)  
                 0.333 
               
               
                 10 
                 Lens 4 
                 −2.646860 (ASP)  
                 1.030 
                 Plastic 
                 1.544 
                 55.9 
                 1.96 
               
               
                 11 
                   
                 −0.863860 (ASP)  
                 0.277 
               
               
                 12 
                 Lens 5 
                 −4.263700 (ASP)  
                 0.353 
                 Plastic 
                 1.544 
                 55.9 
                 −1.84 
               
               
                 13 
                   
                 1.349770 (ASP) 
                 0.500 
               
               
                 14 
                 Image 
                 Plano 
                 0.926 
               
               
                 15 
                   
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm. ASP stands for aspherical surfaces. 
               
             
          
         
       
     
         [0075]    The optical data of this preferred embodiment are listed in Table 13, wherein the object-side surfaces and the image-side surfaces of the first lens element  510  to the fifth lens element  550  comply with the aspherical surface formula as given in Equation (10), and their aspheric coefficients are listed in Table 14 as follows: 
         [0000]    
       
         
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 14 
               
               
                   
               
               
                 Aspheric coefficients of this preferred embodiment 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 4 
                 5 
                 6 
                 7 
                 8 
               
               
                   
               
               
                 k = 
                 −7.72650E+00 
                 7.26990E+01 
                 −9.00000E+01 
                 3.76813E+00 
                  9.00000E+01 
               
               
                 A4 = 
                  1.98676E−01 
                 −2.22201E−02  
                 −1.89633E−02 
                 −3.84114E−02  
                 −1.37560E−01 
               
               
                 A6 = 
                 −1.82870E−01 
                 4.51462E−02 
                  1.50759E−02 
                 5.45918E−02 
                 −1.43251E−01 
               
               
                 A8 = 
                  1.43397E−01 
                 −1.94687E−01  
                  2.21839E−01 
                 1.32249E−01 
                  2.43076E−01 
               
               
                 A10 = 
                 −3.39137E−02 
                 2.88683E−01 
                 −6.55521E−01 
                 −3.61348E−01  
                 −2.17173E−01 
               
               
                 A12 = 
                 −6.09490E−02 
                 −2.74225E−01  
                  6.90407E−01 
                 3.48426E−01 
                  9.67622E−02 
               
               
                 A14 = 
                  2.10345E−02 
                 7.69446E−02 
                 −2.84876E−01 
                 −1.16700E−01  
               
               
                   
               
               
                 Surface # 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k = 
                 −2.06282E+01 
                 2.79567E+00 
                 −3.54903E+00 
                 −9.00000E+01 
                 −1.00958E+01 
               
               
                 A4 = 
                 −7.54199E−02 
                 8.12975E−03 
                 −1.10737E−01 
                 −1.92223E−02 
                 −5.24129E−02 
               
               
                 A6 = 
                 −9.84327E−02 
                 8.47443E−02 
                  1.10066E−01 
                 −2.03067E−02 
                  1.17990E−02 
               
               
                 A8 = 
                  1.17408E−01 
                 −1.73371E−01  
                 −8.74598E−02 
                  8.48103E−03 
                 −3.91275E−03 
               
               
                 A10 = 
                 −4.85129E−02 
                 1.96374E−01 
                  4.34468E−02 
                 −5.65576E−04 
                  9.53802E−04 
               
               
                 A12 = 
                  1.48649E−02 
                 −9.57327E−02  
                 −9.70903E−03 
                 −1.17925E−04 
                 −1.31503E−04 
               
               
                 A14 = 
                   
                 1.78507E−02 
                  6.65638E−04 
                  1.39175E−05 
                  7.97164E−06 
               
               
                   
               
             
          
         
       
     
         [0076]    With reference to Table 13 and the series of aberration curves as shown in  FIG. 5B  for the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment, the focal length of the optical lens assembly for image capture is f=4.39 (mm), the overall aperture value (f-number) of the optical lens assembly for image capture is Fno=2.52, the half of maximum view angle is HFOV=33.1°. After the optical data of this preferred embodiment are calculated and derived, the optical lens assembly satisfies related relations as shown in Table 15 below, and the related symbols have been described above and thus will not be described again. 
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 15 
               
             
             
               
                   
               
               
                 Data of related relations of this preferred embodiment 
               
             
          
           
               
                   
                 Relation 
                 Data 
               
               
                   
                   
               
             
          
           
               
                   
                 v 1 -v 2   
                 32.6 
               
               
                   
                 FT 
                 0.20 
               
               
                   
                 D 1   
                 0.09 
               
               
                   
                 f 3 /f 
                 6.70 
               
               
                   
                 |f/f 3 | 
                 0.15 
               
               
                   
                 f 4 /f 
                 0.45 
               
               
                   
                 SL/TTL 
                 0.96 
               
               
                   
                 TTL/ImgH 
                 1.81 
               
               
                   
                   
               
             
          
         
       
     
         [0077]    According to the optical data as shown in Table 13 and the series of aberration curves as shown in  FIG. 5B , the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment of the present invention provides good correction results in aspects of the longitudinal spherical aberration, astigmatic field curving, and distortion. 
       Sixth Preferred Embodiment 
       [0078]    With reference to  FIGS. 6A and 6B  for a schematic view of an optical lens assembly with a filter member for image taking and a series of aberration curves in accordance with the sixth preferred embodiment of the present invention respectively, the optical lens assembly with a filter member for image taking primarily comprises five lens elements, an aperture stop  602  and a filter member  601 . More specifically, the optical lens assembly with a filter member for image taking, sequentially arranged from an object side to an image side along an optical axis, comprises: the filter member  601  made of plate blue glass for filtering infrared light; the aperture stop  602 ; the plastic first lens element  610  with positive refractive power has a convex object-side surface  611  and a convex image-side surface  612 , and both object-side surface  611  and image-side surface  612  thereof being aspheric; the plastic second lens element  620  with negative refractive power having a convex object-side surface  621  and a concave image-side surface  622 , and both object-side surface  621  and image-side surface  622  being aspheric; the plastic third lens element  630  with negative refractive power having a concave object-side surface  631  and a convex image-side surface  632 , and both object-side surface  631  and image-side surface  632  thereof being aspheric; the plastic fourth lens element  640  with positive refractive power having a concave object-side surface  641  and a convex image-side surface  642 , and both object-side surface  641  and image-side surface  642  thereof being aspheric; the plastic fifth lens element  650  with negative refractive power having a concave object-side surface  651  and a concave image-side surface, both object-side surface  651  and image-side surface  652  thereof being aspheric, and at least one of the object-side surface  651  and image-side surface  652  thereof having at least one inflection point; an image sensor  680  at an image plane  670 . With a combination of the lens assembly  60  having five lens elements, the aperture stop  602  and the filter member  601 , an image of a photographed object can be formed onto the image sensor  680 . 
         [0000]    
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 16 
               
             
             
               
                   
               
               
                 Optical data of this preferred embodiment 
               
               
                 f = 4.36 mm, Fno = 2.45, HFOV = 33.1 deg. 
               
             
          
           
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 IR-filter 
                 Plano 
                 0.200 
                 Glass 
                 1.527 
                 64.2 
                 — 
               
               
                 2 
                   
                 Plano 
                 0.300 
                 (Blue 
               
               
                   
                   
                   
                   
                 Glass) 
               
               
                 3 
                 Ape. Stop 
                 Plano 
                 −0.230 
               
               
                 4 
                 Lens 1 
                 1.642070 (ASP) 
                 0.775 
                 Plastic 
                 1.544 
                 55.9 
                 2.74 
               
               
                 5 
                   
                 −13.746800 (ASP)  
                 0.068 
               
               
                 6 
                 Lens 2 
                 100.000000 (ASP)  
                 0.262 
                 Plastic 
                 1.634 
                 23.8 
                 −4.66 
               
               
                 7 
                   
                 2.868090 (ASP) 
                 0.484 
               
               
                 8 
                 Lens 3 
                 −14.912000 (ASP)  
                 0.306 
                 Plastic 
                 1.634 
                 23.8 
                 −52.83 
               
               
                 9 
                   
                 −27.094000 (ASP)  
                 0.278 
               
               
                 10 
                 Lens 4 
                 −2.746930 (ASP)  
                 0.945 
                 Plastic 
                 1.544 
                 55.9 
                 1.98 
               
               
                 11 
                   
                 −0.867770 (ASP)  
                 0.277 
               
               
                 12 
                 Lens 5 
                 −4.612100 (ASP)  
                 0.365 
                 Plastic 
                 1.544 
                 55.9 
                 −1.93 
               
               
                 13 
                   
                 1.394850 (ASP) 
                 0.500 
               
               
                 14 
                 Image 
                 Plano 
                 0.891 
               
               
                 15 
                   
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm. ASP stands for aspherical surfaces. 
               
             
          
         
       
     
         [0079]    The optical data of this preferred embodiment are listed in Table 16, wherein the object-side surfaces and the image-side surfaces of the first lens element  610  to the fifth lens element  650  comply with the aspherical surface formula as given in Equation (10), and their aspheric coefficients are listed in Table 17 as follows: 
         [0000]    
       
         
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 17 
               
               
                   
               
               
                 Aspheric coefficients of this preferred embodiment 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 4 
                 5 
                 6 
                 7 
                 8 
               
               
                   
               
               
                 k = 
                 −7.37794E+00 
                 3.24959E+01 
                 −9.00000E+01 
                 3.58896E+00 
                 −9.00000E+01 
               
               
                 A4 = 
                  2.02964E−01 
                 −2.15843E−02  
                 −1.81672E−02 
                 −3.37616E−02  
                 −1.66744E−01 
               
               
                 A6 = 
                 −1.82197E−01 
                 5.47852E−02 
                  1.88546E−02 
                 4.30220E−02 
                 −1.66738E−01 
               
               
                 A8 = 
                  1.40829E−01 
                 −2.01289E−01  
                  2.31330E−01 
                 1.37918E−01 
                  2.42464E−01 
               
               
                 A10 = 
                 −2.95269E−02 
                 2.84783E−01 
                 −6.57780E−01 
                 −3.47932E−01  
                 −2.15533E−01 
               
               
                 A12 = 
                 −5.75372E−02 
                 −2.67407E−01  
                  6.83637E−01 
                 3.36467E−01 
                  9.34803E−02 
               
               
                 A14 = 
                  2.10345E−02 
                 7.69446E−02 
                 −2.84876E−01 
                 −1.16700E−01  
               
               
                   
               
               
                 Surface # 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k = 
                 −9.00000E+01 
                 3.00717E+00 
                 −3.40417E+00 
                 −8.88210E+01 
                 −1.03637E+01 
               
               
                 A4 = 
                 −1.05300E−01 
                 2.43484E−03 
                 −1.16275E−01 
                 −1.90910E−02 
                 −5.33233E−02 
               
               
                 A6 = 
                 −1.01983E−01 
                 8.28282E−02 
                  1.13406E−01 
                 −2.03240E−02 
                  1.17970E−02 
               
               
                 A8 = 
                  1.16308E−01 
                 −1.73314E−01  
                 −8.72395E−02 
                  8.46071E−03 
                 −3.90282E−03 
               
               
                 A10 = 
                 −4.83787E−02 
                 1.96304E−01 
                  4.33763E−02 
                 −5.69618E−04 
                  9.49146E−04 
               
               
                 A12 = 
                  1.60930E−02 
                 −9.58341E−02  
                 −9.72933E−03 
                 −1.18095E−04 
                 −1.32178E−04 
               
               
                 A14 = 
                   
                 1.78418E−02 
                  6.55676E−04 
                  1.41063E−05 
                  8.07987E−06 
               
               
                   
               
             
          
         
       
     
         [0080]    With reference to Table 16 and the series of aberration curves as shown in  FIG. 6B  for the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment, the focal length of the optical lens assembly for image capture is f=4.36 (mm), the overall aperture value (f-number) of the optical lens assembly for image capture is Fno=2.45, the half of maximum view angle is HFOV=33.1°. After the optical data of this preferred embodiment are calculated and derived, the optical lens assembly satisfies related relations as shown in Table 18 below, and the related symbols have been described above and thus will not be described again. 
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 18 
               
             
             
               
                   
               
               
                 Data of related relations of this preferred embodiment 
               
             
          
           
               
                   
                 Relation 
                 Data 
               
               
                   
                   
               
             
          
           
               
                   
                 v 1 -v 2   
                 32.1 
               
               
                   
                 FT 
                 0.20 
               
               
                   
                 D 1   
                 0.07 
               
               
                   
                 f 3 /f 
                 −12.11 
               
               
                   
                 |f/f 3 | 
                 0.08 
               
               
                   
                 f 4 /f 
                 0.45 
               
               
                   
                 SL/TTL 
                 0.96 
               
               
                   
                 TTL/ImgH 
                 1.79 
               
               
                   
                   
               
             
          
         
       
     
         [0081]    According to the optical data as shown in Table 16 and the series of aberration curves as shown in  FIG. 6B , the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment of the present invention provides good correction results in aspects of the longitudinal spherical aberration, astigmatic field curving, and distortion. 
       Seventh Preferred Embodiment 
       [0082]    With reference to  FIGS. 7A and 7B  for a schematic view of an optical lens assembly with a filter member for image taking and a series of aberration curves in accordance with the seventh preferred embodiment of the present invention respectively, the optical lens assembly with a filter member for image taking mainly comprises three lens elements, an aperture stop  702  and a filter member  701 . More specifically, the optical lens assembly with a filter member for image taking, sequentially arranged from an object side to an image side along an optical axis, comprises: the filter member  701  made of plate blue glass for filtering infrared light; the aperture stop  702 ; the plastic first lens element  710  with positive refractive power having a convex object-side surface  711  and a concave image-side surface  712 , and both object-side surface  711  and image-side surface  712  thereof being aspheric; the plastic second lens element  720  with negative refractive power having a concave object-side surface  721  and a convex image-side surface  722 , and both object-side surface  721  and image-side surface  722  being aspheric; the plastic third lens element  730  with positive refractive power having a convex object-side surface  731  and a concave image-side surface  732 , both object-side surface  731  and image-side surface  732  thereof being aspheric; an image sensor  780  at an image plane  770 . With a combination of the lens assembly  70  having three lens elements, the aperture stop  702  and the filter member  701 , an image of a photographed object can be formed onto the image sensor  780 . 
         [0000]    
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 19 
               
             
             
               
                   
               
               
                 Optical data of this preferred embodiment 
               
               
                 f = 1.73 mm, Fno = 2.40, HFOV = 36.2 deg. 
               
             
          
           
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 IR-filter 
                 Plano 
                 0.200 
                 Glass 
                 1.527 
                 64.2 
                 — 
               
               
                 2 
                   
                 Plano 
                 0.200 
                 (Blue 
               
               
                   
                   
                   
                   
                 Glass) 
               
               
                 3 
                 Ape. Stop 
                 Plano 
                 −0.071 
               
               
                 4 
                 Lens 1 
                 0.753640 (ASP) 
                 0.365 
                 Plastic 
                 1.544 
                 55.9 
                 1.56 
               
               
                 5 
                   
                 5.688800 (ASP) 
                 0.221 
               
               
                 6 
                 Lens 2 
                 −0.755660 (ASP)  
                 0.250 
                 Plastic 
                 1.634 
                 23.8 
                 −3.96 
               
               
                 7 
                   
                 −1.219530 (ASP)  
                 0.197 
               
               
                 8 
                 Lens 3 
                 0.798670 (ASP) 
                 0.416 
                 Plastic 
                 1.544 
                 55.9 
                 7.02 
               
               
                 9 
                   
                 0.824550 (ASP) 
                 0.200 
               
               
                 10 
                 Image 
                 Plano 
                 0.456 
               
               
                 11 
                   
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm. ASP stands for aspherical surfaces. 
               
             
          
         
       
     
         [0083]    The optical data of this preferred embodiment are listed in Table 19, wherein the object-side surfaces and the image-side surfaces of the first lens element  710  to the third lens element  730  comply with the aspherical surface formula as given in Equation (10), and their aspheric coefficients are listed in Table 20 as follows: 
         [0000]    
       
         
               
             
               
               
               
               
             
           
               
                 TABLE 20 
               
               
                   
               
               
                 Aspheric coefficients of this preferred embodiment 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                  1.66465E−02 
                 −1.00000E+00 
                  5.38499E−01 
               
               
                 A4 = 
                 −4.04314E−01 
                 −6.14790E−01 
                 −4.92235E−02 
               
               
                 A6 = 
                  4.08221E+00 
                  1.04601E+00 
                 −1.42466E+01 
               
               
                 A8 = 
                 −4.37025E+01 
                 −4.80339E+01 
                  1.65851E+02 
               
               
                 A10 = 
                  2.71636E+02 
                  2.70982E+02 
                 −4.83515E+02 
               
               
                 A12 = 
                 −9.58761E+02 
                 −9.19876E+02 
                 −3.17740E+02 
               
               
                 A14 = 
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
               
               
                   
               
               
                 k = 
                 9.20873E−01 
                 −1.45503E+00 
                 −1.16469E+00 
               
               
                 A4 = 
                 −1.60768E+00  
                 −2.66713E+00 
                 −1.58422E+00 
               
               
                 A6 = 
                 8.44503E+00 
                  5.78314E+00 
                  2.44305E+00 
               
               
                 A8 = 
                 −2.02193E+01  
                 −8.05417E+00 
                 −2.81651E+00 
               
               
                 A10 = 
                 1.47095E+02 
                  6.68337E+00 
                  1.47976E+00 
               
               
                 A12 = 
                 −3.01063E+02  
                 −2.34007E+00 
                  5.23171E−01 
               
               
                 A14 = 
                 1.71502E+01 
                   
                 −1.17564E+00 
               
               
                 A16 = 
                   
                   
                  4.51793E−01 
               
               
                   
               
             
          
         
       
     
         [0084]    With reference to Table 19 and the series of aberration curves as shown in  FIG. 7B  for the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment, the focal length of the optical lens assembly for image capture is f=1.73 (mm), the overall aperture value (f-number) of the optical lens assembly for image capture is Fno=2.40, the half of maximum view angle is HFOV=36.2°. After the optical data of this preferred embodiment are calculated and derived, the optical lens assembly satisfies related relations as shown in Table 21 below, and the related symbols have been described above and thus will not be described again. 
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 21 
               
             
             
               
                   
               
               
                 Data of related relations of this preferred embodiment 
               
             
          
           
               
                   
                 Relation 
                 Data 
               
               
                   
                   
               
             
          
           
               
                   
                 v 1 -v 2   
                 32.1 
               
               
                   
                 FT 
                 0.20 
               
               
                   
                 D 1   
                 0.13 
               
               
                   
                 f 3 /f 
                 4.06 
               
               
                   
                 |f/f 3 | 
                 0.25 
               
               
                   
                 f 4 /f 
                 — 
               
               
                   
                 SL/TTL 
                 0.97 
               
               
                   
                 TTL/ImgH 
                 1.64 
               
               
                   
                   
               
             
          
         
       
     
         [0085]    According to the optical data as shown in Table 19 and the series of aberration curves as shown in  FIG. 7B , the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment of the present invention provides good correction results in aspects of the longitudinal spherical aberration, astigmatic field curving, and distortion. 
       Eighth Preferred Embodiment 
       [0086]    With reference to  FIGS. 8A and 8B  for a schematic view of an optical lens assembly with a filter member for image taking and a series of aberration curves in accordance with the eighth preferred embodiment of the present invention respectively, the optical lens assembly with a filter member for image taking comprises three lens elements, an aperture stop  802  and a filter member  801 . More specifically, the optical lens assembly with a filter member for image taking, sequentially arranged from an object side to an image side along an optical axis, comprises: the filter member  801  made of plate blue glass for filtering infrared light; the plastic first lens element  810  with positive refractive power having a convex object-side surface  811  and a convex image-side surface  812 , and both object-side surface  811  and image-side surface  812  thereof being aspheric; the aperture stop  802 ; the plastic second lens element  820  with negative refractive power having a concave object-side surface  821  and a convex image-side surface  822 , and both object-side surface  821  and image-side surface  822  being aspheric; the plastic third lens element  830  with negative refractive power having a convex object-side surface  831  and a concave image-side surface  832 , and both object-side surface  831  and image-side surface  832  thereof being aspheric; an image sensor  880  at an image plane  870 . With a combination of the lens assembly  80  having three lens elements, the aperture stop  802  and the filter member  801 , an image of a photographed object can be formed onto the image sensor  880 . 
         [0000]    
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 22 
               
             
             
               
                   
               
               
                 Optical data of this preferred embodiment 
               
               
                 f =2.94 mm, Fno = 2.70, HFOV = 30.5 deg. 
               
             
          
           
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 IR-filter 
                 Plano 
                 0.200 
                 Glass 
                 1.527 
                 64.2 
                 — 
               
               
                 2 
                   
                 Plano 
                 0.200 
                 (Blue 
               
               
                   
                   
                   
                   
                 Glass) 
               
               
                 3 
                 Lens 1 
                 1.282840 (ASP) 
                 0.474 
                 Plastic 
                 1.544 
                 55.9 
                 2.25 
               
               
                 4 
                   
                 −22.925300 (ASP)  
                 0.050 
               
               
                 5 
                 Ape. Stop 
                 Plano 
                 0.417 
               
               
                 6 
                 Lens 2 
                 −1.070460 (ASP)  
                 0.558 
                 Plastic 
                 1.634 
                 23.8 
                 −8.42 
               
               
                 7 
                   
                 −1.610550 (ASP)  
                 0.378 
               
               
                 8 
                 Lens 3 
                 1.718060 (ASP) 
                 0.622 
                 Plastic 
                 1.544 
                 55.9 
                 −34.42 
               
               
                 9 
                   
                 1.372940 (ASP) 
                 0.150 
               
               
                 10 
                 Image 
                 Plano 
                 0.851 
               
               
                 11 
                   
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm. ASP stands for aspherical surfaces. 
               
             
          
         
       
     
         [0087]    The optical data of this preferred embodiment are listed in Table 22, wherein the object-side surfaces and the image-side surfaces of the first lens element  810  to the third lens element  830  comply with the aspherical surface formula as given in Equation (10), and their aspheric coefficients are listed in Table 23 as follows: 
         [0000]    
       
         
               
             
               
               
               
               
             
           
               
                 TABLE 23 
               
               
                   
               
               
                 Aspheric coefficients of this preferred embodiment 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 3 
                 4 
                 6 
               
               
                   
               
               
                 k = 
                 −2.10302E+00 
                 −1.00000E+00 
                 −2.10480E+00 
               
               
                 A4 = 
                  6.75735E−02 
                 −8.35282E−02 
                 −1.38864E−01 
               
               
                 A6 = 
                 −3.00918E−02 
                 −6.47450E−01 
                 −3.37031E−01 
               
               
                 A8 = 
                 −4.45068E−01 
                  2.26279E+00 
                  6.53346E+00 
               
               
                 A10 = 
                  5.43769E−01 
                 −6.36902E+00 
                 −2.38737E+01 
               
               
                 A12 = 
                 −1.22982E+00 
                  6.34885E+00 
                  2.69489E+01 
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
               
               
                   
               
               
                 k = 
                 −8.88432E−01 
                 −7.57509E+00 
                 −3.64413E+00 
               
               
                 A4 = 
                 −3.29976E−02 
                 −2.80096E−01 
                 −2.63554E−01 
               
               
                 A6 = 
                  1.63907E−01 
                  2.32627E−01 
                  1.83097E−01 
               
               
                 A8 = 
                  1.21603E+00 
                 −8.18684E−02 
                 −9.65356E−02 
               
               
                 A10 = 
                 −1.99991E+00 
                  9.86180E−03 
                  2.97536E−02 
               
               
                 A12 = 
                  9.93607E−01 
                 −1.40742E−05 
                 −4.05589E−03 
               
               
                   
               
             
          
         
       
     
         [0088]    With reference to Table 22 and the series of aberration curves as shown in  FIG. 8B  for the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment, the focal length of the optical lens assembly for image capture is f=2.94 (mm), the overall aperture value (f-number) of the optical lens assembly for image capture is Fno=2.70, the half of maximum view angle is HFOV=30.5°. After the optical data of this preferred embodiment are calculated and derived, the optical lens assembly satisfies related relations as shown in Table 24 below, and the related symbols have been described above and thus will not be described again. 
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 24 
               
             
             
               
                   
               
               
                 Data of related relations of this preferred embodiment 
               
             
          
           
               
                   
                 Relation 
                 Data 
               
               
                   
                   
               
             
          
           
               
                   
                 v 1 -v 2   
                 32.5 
               
               
                   
                 FT 
                 0.20 
               
               
                   
                 D 1   
                 0.20 
               
               
                   
                 f 3 /f 
                 −11.71 
               
               
                   
                 |f/f 3 | 
                 0.09 
               
               
                   
                 f 4 /f 
                 — 
               
               
                   
                 SL/TTL 
                 0.85 
               
               
                   
                 TTL/ImgH 
                 2.00 
               
               
                   
                   
               
             
          
         
       
     
         [0089]    According to the optical data as shown in Table 22 and the series of aberration curves as shown in  FIG. 8B , the optical lens assembly with a filter member for image taking in accordance with this preferred embodiment of the present invention provides good correction results in aspects of the longitudinal spherical aberration, astigmatic field curving, and distortion. 
         [0090]    The filter member as described in the foregoing preferred embodiments are made of plate blue glass, plate glass with a coating or blue glass with a coating. If the filter member is made of blue glass that can filter infrared light, the reflections can be reduced. If the filter member is made of plate glass with a coating, the production cost can be lowered effectively. The materials used for making the filter members of the aforementioned preferred embodiments are given as examples only, but the invention is not limited to such materials only. 
         [0091]    In the optical lens assembly with a filter member for image taking of the present invention, the lens element can be made of glass or plastic. If the lens element is made of glass, the selection of the refractive power for the optical lens assembly with a filter member for image taking refractive power can be more flexible. If the lens is made of plastic, the production cost can be reduced effectively. In addition, the optical surface of the lens element is aspheric, and the aspheric surface can be easily manufactured into any shape other than those within the limitation of a spheric surface to have more control factors for eliminating aberrations, so as to reduce the number of lenses used and the total length of the optical lens assembly of the present invention. 
         [0092]    In the optical lens assembly with a filter member for image taking of the present invention, at least one aperture stop such as a glare stop or a field stop is provided for reducing stray lights to improve the image quality. 
         [0093]    With reference to  FIG. 9  for a transmittance reference curve of a filter member of the present invention, the transmittance of an infrared band falling beyond the range of visible lights is very low, indicating that the blue glass has a good effect of absorbing the incident infrared light, and thus the optical lens assembly has a good color shift correction function. Tables 1 to 24 show changes of values of an optical lens assembly with a filter member for image taking in accordance with different preferred embodiments of the present invention respectively, and each preferred embodiment can have good correction in aspects of the longitudinal spherical aberration, astigmatic field curving, and distortion. However, the changes of values in the preferred embodiments of the present invention are obtained from experiments, and even if different values are used, products of the same structure are intended to be covered by the scope of the present invention. It is noteworthy to point out that the aforementioned description and the illustration of related drawings are provided for the purpose of explaining the technical characteristics of the present invention, but not intended for limiting the scope of the present invention.