Patent ID: 12242042

Throughout the drawings and the detailed description, the same reference numerals refer to the same elements. The drawings may not be to scale, and the relative size, proportions, and depiction of elements in the drawings may be exaggerated for clarity, illustration, and convenience.

DETAILED DESCRIPTION

The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatuses, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent after an understanding of the disclosure of this application. For example, the sequences of operations described herein are merely examples, and are not limited to those set forth herein, but may be changed as will be apparent after an understanding of the disclosure of this application, with the exception of operations necessarily occurring in a certain order. Also, descriptions of features that are known in the art may be omitted for increased clarity and conciseness.

The features described herein may be embodied in different forms, and are not to be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways of implementing the methods, apparatuses, and/or systems described herein that will be apparent after an understanding of the disclosure of this application.

In the drawings, the thicknesses, sizes, and shapes of lenses have been slightly exaggerated for convenience of explanation. Particularly, the shapes of spherical surfaces or aspherical surfaces illustrated in the drawings are illustrated by way of example. That is, the shapes of the spherical surfaces or the aspherical surfaces are not limited to those illustrated in the drawings.

An aspect of the present disclosure may provide an optical imaging system which may be easily applied to a portable electronic device, readily perform an aberration correction, and have a narrow field of view.

Referring toFIG.1, a multi-member optical imaging system in the examples described herein may include a plurality of optical imaging systems and each of the plurality of optical imaging systems may include a plurality of lenses.

For example, the multi-member optical imaging system in the examples disclosed herein may include a first optical imaging system400and a second imaging system500.

The first optical imaging system400and the second optical imaging system500may have different fields of view. A field of view of the first optical imaging system400may be narrower than that of the second optical imaging system500. As an example, the field of view of the first optical imaging system400may be smaller than 44°, and the field of view of the second optical imaging system500may be greater than that of the first optical imaging system400.

As described above, a plurality of optical imaging systems may be designed to have different fields of view to thus capture an image of a subject at various depths and implement a zoom function.

In addition, since an image having a high level of resolution or a bright image may be generated by using (for example, synthesizing) a plurality of images for one subject, an image of the subject may be clearly captured even in a low illuminance environment.

The plurality of optical imaging systems may be mounted in a portable electronic device600.

Examples of the first optical imaging system400will hereinafter be described with reference toFIGS.2through7.

The first optical imaging system400in the examples disclosed herein may include a plurality of lenses disposed along an optical axis. The plurality of lenses may be disposed to be spaced apart from each other by preset distances along the optical axis.

As an example, the first optical imaging system400may include six lenses.

In the examples disclosed herein in which the optical imaging system includes six lenses, a first lens refers to a lens closest to an object, while a sixth lens refers to a lens closest to an image sensor.

In addition, a first surface of each lens refers to a surface thereof closest to an object side (or an object-side surface) and a second surface of each lens refers to a surface thereof closest to an image side (or an image-side surface). Further, in the present specification, all numerical values of radii of curvature, thicknesses, distances, and the like, of lenses are indicated by millimeters (mm), and an angle is indicated by degrees.

Further, in a description for a shape of each of the lenses, the meaning that one surface of a lens is convex is that a paraxial region portion of a corresponding surface is convex, and the meaning that one surface of a lens is concave is that a paraxial region portion of a corresponding surface is concave. Therefore, although it is described that one surface of a lens is convex, an edge portion of the lens may be concave. Likewise, although it is described that one surface of a lens is concave, an edge portion of the lens may be convex.

A paraxial region refers to a narrow region in the vicinity of an optical axis.

The first optical imaging system400in the examples disclosed herein may include six lenses.

For example, the first optical imaging system400in the examples disclosed herein may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially disposed from the object side.

However, the first optical imaging system400in the examples disclosed herein is not limited to only including six lenses, but may further include other components.

For example, the first optical imaging system400may further include an image sensor configured to convert an image of a subject incident on the image sensor into an electrical signal.

In addition, the first optical imaging system400may further include an infrared cut-off filter configured to filter infrared light. The infrared cut-off filter may be disposed between a lens (as an example, the sixth lens) closest to the image sensor and the image sensor.

In addition, the first optical imaging system400may further include a stop for controlling an amount of light. For example, the stop may be disposed between the third lens and the fourth lens.

In the first optical imaging system400in the examples disclosed herein, all of the lenses may be formed of plastic. In addition, each lens may be formed of plastic having optical characteristics different from those of an adjacent lens.

In addition, the plurality of lenses may have at least one aspherical surface.

That is, at least one of first and second surfaces of all of the first to sixth lenses may be an aspherical surface. Here, the aspherical surfaces of the first to sixth lenses may be represented by the following Equation 1:

Z=cY21+1-(1+K)⁢c2⁢Y2+AY4+BY6+CY8+DY10+EY1⁢2+FY1⁢4+GY1⁢6+…(1)

In Equation 1, c is a curvature (an inverse of a radius of curvature) of a lens, K is a conic constant, and Y is a distance from a certain point on an aspherical surface of the lens to an optical axis in a direction perpendicular to the optical axis. In addition, constants A to G are aspherical coefficients. In addition, Z is a distance between the certain point on the aspherical surface of the lens at the distance Y and a tangential plane meeting the apex of the aspherical surface of the lens.

The first optical imaging system400including the first to sixth lenses may have positive refractive power/negative refractive power/negative refractive power/positive refractive power/negative refractive power/positive refractive power sequentially from the object side.

Alternatively, the first optical imaging system400may have positive refractive power/negative refractive power/negative refractive power/negative refractive power/negative refractive power/positive refractive power.

The first optical imaging system400in the examples disclosed herein may satisfy the following Conditional Expressions 2-7:
TTL/F≤0.83  (2)
2.2<D23/D34<5.4  (3)
10<D23/D12<22  (4)
58<D45/D56<65  (5)
0.3<f1/F<0.4  (6)
FOV<44°  (7)

In the above Conditional Expressions 2-7, TTL is a distance from an object-side surface of the first lens to an imaging plane of the image sensor, F is an overall focal length of the first optical imaging system400, D12 is an optical axis distance between the first lens and the second lens, D23 is an optical axis distance between the second lens and the third lens, D34 is an optical axis distance between the third lens and the fourth lens, D45 is an optical axis distance between the fourth lens and the fifth lens, D56 is an optical axis distance between the fifth lens and the sixth lens, f1 is a focal length of the first lens, and FOV is a field of view of the first optical imaging system400.

Next, the first to sixth lenses constituting the first optical imaging system400in the examples disclosed herein will be described.

The first lens may have positive refractive power.

In addition, both surfaces of the first lens may be convex. That is, first and second surfaces of the first lens may be convex.

At least one of the first and second surfaces of the first lens may be an aspherical surface. For example, both surfaces of the first lens may be aspherical surfaces.

The second lens may have negative refractive power. In addition, the second lens may have a meniscus shape of which an object-side surface is convex. That is, a first surface of the second lens may be convex, and a second surface thereof may be concave. Alternatively, both surfaces of the second lens may be concave. That is, the first and second surfaces of the second lens may be concave.

At least one of the first and second surfaces of the second lens may be an aspherical surface. For example, both surfaces of the second lens may be aspherical surfaces.

In addition, the first lens and the second lens may be formed of plastic having different optical characteristics from each other. That is, the first lens may be formed of plastic having first optical characteristics and the second lens may be formed of plastic having second optical characteristics different from the first optical characteristics.

The third lens may have negative refractive power. In addition, the third lens may have a meniscus shape of which an object-side surface is convex. That is, a first surface of the third lens may be convex, and a second surface thereof may be concave.

At least one of the first and second surfaces of the third lens may be an aspherical surface. For example, both surfaces of the third lens may be aspherical surfaces.

The fourth lens may have positive or negative refractive power. In addition, the fourth lens may have a meniscus shape of which an object-side surface is convex. That is, a first surface of the fourth lens may be convex, and a second surface thereof may be concave.

At least one of the first and second surfaces of the fourth lens may be an aspherical surface. For example, both surfaces of the fourth lens may be aspherical surfaces.

In addition, at least one inflection point may be formed on the first surface of the fourth lens. For example, the first surface of the fourth lens may be convex in the paraxial region and become concave toward an edge thereof.

In addition, the third lens and the fourth lens may be formed of plastic having different optical characteristics from each other.

Further, a stop may be disposed between the third lens and the fourth lens.

The fifth lens may have negative refractive power. In addition, the fifth lens may have a meniscus shape of which an image-side surface is convex. That is, a first surface of the fifth lens may be concave, and a second surface thereof may be convex.

At least one of the first and second surfaces of the fifth lens may be an aspherical surface. For example, both surfaces of the fifth lens may be aspherical surfaces.

In addition, at least one inflection point may be formed on the first surface of the fifth lens. For example, the first surface of the fifth lens may be concave in the paraxial region and become convex toward an edge thereof.

The sixth lens may have positive refractive power. In addition, the sixth lens may have a meniscus shape of which an image-side surface is convex. That is, a first surface of the sixth lens may be concave, and a second surface thereof may be convex.

At least one of the first and second surfaces of the sixth lens may be an aspherical surface. For example, both surfaces of the sixth lens may be aspherical surfaces.

In addition, the fifth lens and the sixth lens may be formed of plastic having different optical characteristics.

In the first optical imaging system400configured as described above, a plurality of lenses may perform an aberration correction function to increase aberration improvement performance.

As an example, an optical axis distance between the first lens and the second lens formed of the plastic having different optical characteristics may be configured to be relatively short to improve chromatic aberration correction performance. That is, the first and second lenses may be disposed along the optical axis relatively close to each other.

In addition, an optical axis distance between the third lens and the fourth lens formed of the plastic having different optical characteristics may be configured to be relatively short, to improve chromatic aberration correction performance. That is, the third and fourth lenses may be disposed along the optical axis relatively close to each other.

In addition, an optical axis distance between the fifth lens and the sixth lens formed of the plastic having different optical characteristics may be configured to be relatively short to improve chromatic aberration correction performance. That is, the fifth and sixth lenses may be disposed along the optical axis relatively close to each other.

Meanwhile, the first optical imaging system400in the examples disclosed herein may have characteristics of a telephoto lens of which a field of view is less than 44°.

A first example of the optical imaging system400in the examples disclosed herein will be described with reference toFIGS.2and3.

The first optical imaging system400ain the examples disclosed herein may include an optical system including a first lens110, a second lens120, a third lens130, a fourth lens140, a fifth lens150, and a sixth lens160, and may further include an infrared cut-off filter170, an image sensor180, and a stop ST.

Here, example lens characteristics (radii of curvature, thicknesses of lenses or distances between the lenses, refractive indices, Abbe numbers, and effective aperture radii) of each lens are represented in Table 1.

TABLE 1Radius ofThickness orRefractiveAbbeEffectiveFocalExample 1CurvatureDistanceIndexNumberAperture RadiusLengthS11.4639467310.9649350431.53655.6501.2202.416S2−8.6468662850.0251.097S3959.54486450.241.66720.3531.042−5.09S43.3829335550.5291616760.899S519.428108570.241.54656.1140.708−4.382S62.1209266830.0982201060.617S75.1828582930.3046850871.66720.3530.60871.91S85.6741588321.456298140.744S9−2.2641527790.41.53655.6501.822−5.153S10−13.323048520.0251.928S11−21.295509250.6116999481.66720.3532.0907.756S12−4.2100328840.0252.204S13Infinity0.211.51864.1972.400S14Infinity0.6701790442.451ImageInfinity−0.052.725

Meanwhile, in the first example, an overall focal length F of the first optical imaging system400ais 6.927 mm, a focal length f1 of the first lens110is 2.416 mm, a focal length f2 of the second lens120is −5.09 mm, a focal length f3 of the third lens130is −4.382 mm, a focal length f4 of the fourth lens140is 71.91 mm, a focal length f5 of the fifth lens150is −5.153 mm, and a focal length f6 of the sixth lens160is 7.756 mm.

In the first example, field of view (FOV) of the first optical imaging system400ais 43.43° and the effective aperture radius (earl) of an object-side surface of the first lens110is 1.22 mm.

Meanwhile, the effective aperture radius refers to a radius of a surface (an object-side surface or an image-side surface) of each lens through which light actually passes. As an example, referring toFIG.1, the effective aperture radius (earl) refers to a straight line distance between an end portion at which light is incident on the object-side surface of the first lens110and the optical axis.

In the first example, the first lens110may have positive refractive power, and a first surface and a second surface thereof may be convex in a paraxial region.

The second lens120may have negative refractive power, and a first surface thereof may be convex in a paraxial region and a second surface thereof may be concave in the paraxial region.

An optical axis distance between the first lens110and the second lens120may be configured to be relatively short. That is, the first and second lenses110,120may be disposed along the optical axis relatively close to each other.

The first lens110and the second lens120may be formed of plastic having optical characteristics different from each other. For example, the Abbe numbers of the first lens110and the second lens120may be different from each other.

The optical axis distance between the first lens110and the second lens120formed of the plastic having different optical characteristics may be configured to be relatively short to improve chromatic aberration correction performance.

The third lens130may have negative refractive power, and a first surface thereof may be convex in the paraxial region and a second surface thereof may be concave in the paraxial region.

The fourth lens140may have positive refractive power, and a first surface thereof may be convex in a paraxial region and a second surface thereof may be concave in the paraxial region.

An optical axis distance between the third lens130and the fourth lens140may be configured to be relatively short. That is, the third and fourth lenses130,140may be disposed along the optical axis relatively close to each other.

The third lens130and the fourth lens140may be formed of plastic having optical characteristics different from each other. For example, the Abbe numbers of the third lens130and the fourth lens140may be different from each other.

The optical axis distance between the third lens130and the fourth lens140formed of the plastic having different optical characteristics may be configured to be relatively short to improve chromatic aberration correction performance.

In addition, at least one inflection point may be formed on the first surface of the fourth lens140. For example, the first surface of the fourth lens140may be convex in a paraxial region and become concave toward an edge thereof.

In addition, the stop ST may be disposed between the third lens130and the fourth lens140.

The inflection point may be formed on the surface of the lens disposed close to the stop ST to thus improve correction performance of astigmatism and coma-aberration.

The fifth lens150may have negative refractive power, and a first surface thereof may be concave in the paraxial region and a second surface thereof may be convex in the paraxial region.

In addition, at least one inflection point may be formed on the first surface of the fifth lens150. For example, the first surface of the fifth lens150may be concave in a paraxial region and become convex toward an edge thereof.

The sixth lens160may have positive refractive power, and a first surface thereof may be concave in the paraxial region and a second surface thereof may be convex in the paraxial region.

An optical axis distance between the fifth lens150and the sixth lens160may be configured to be relatively short. That is, the fifth and sixth lenses150,160may be disposed along the optical axis relatively close to each other.

The fifth lens150and the sixth lens160may be formed of plastic having optical characteristics different from each other. For example, the Abbe numbers of the fifth lens150and the sixth lens160may be different from each other.

The optical axis distance between the fifth lens150and the sixth lens160formed of the plastic having different optical characteristics may be configured to be relatively short to improve chromatic aberration correction performance.

Meanwhile, respective surfaces of the first to sixth lenses110to160may have aspherical coefficients as illustrated in Table. 2. For example, all of object-side surfaces and image-side surfaces of the first to sixth lenses110to160may be aspherical surfaces.

TABLE 2S1S2S3S4S5S6R1.463946731−8.646866285959.54486453.38293355519.428108572.120926683K−0.1339893840.9983442460.2979090750.509997595−6.6855473740.87805276A1.09E−240.0288637780.0205099330.0196305180.055022581−0.02306423B−4.27E−367.08E−05−0.003001680.038792531−0.287790834−1.37E−01C1.00E−47−1.24E−030.007410129−0.1987244780.6934127662.50E−01D−1.35E−592.47E−04−0.0047905440.435476904−1.004707565−1.49E−01E1.03E−71−2.28E−050.001506562−0.4917804910.6939342444.23E−02F−4.13E−841.05E−06−0.0002852410.268401617−0.219209737−5.89E−03G6.79E−97−1.92E−082.37E−05−0.0539831130.0260513653.24E−04S7S8S9S10S11S12R5.1828582935.674158832−2.264152779−13.32304852−21.29550925−4.210032884K0.9999998584.73488621−11.96617843−27.0837742697.99999914−4.588713472A−0.09512504−1.05E−19−0.166954516−0.097017719−7.30E−17−1.78E−45B−0.095125052.44E−300.1126229880.0350752675.98E−242.94E−67C0.050439683−3.58E−41−0.028457272−0.008279172−1.98E−31−1.33E−89D−0.0670982043.27E−520.0025530830.0011450812.98E−393.14E−112E0.060515193−1.81E−630.00021226−8.67E−05−2.07E−47−4.00E−135F−0.0214169415.54E−75−5.37E−053.28E−066.58E−562.59E−158G0.002587362−7.14E−872.60E−06−4.84E−08−7.79E−65−6.67E−182

In addition, the first optical imaging system400aconfigured as described above may have aberration characteristics illustrated inFIG.3.

A second example of the first optical imaging system400will be described with reference toFIGS.4and5.

The second example of the first optical imaging system400bmay include an optical system including a first lens210, a second lens220, a third lens230, a fourth lens240, a fifth lens250, and a sixth lens260, and may further include an infrared cut-off filter270, an image sensor280, and a stop ST.

Here, lens characteristics (radii of curvature, thicknesses of lenses or distances between the lenses, refractive indices, Abbe numbers, and effective aperture radii) of each lens are represented in Table 3.

TABLE 3Radius ofThickness orRefractiveAbbeEffectiveFocalExample 2CurvatureDistanceIndexNumberAperture RadiusLengthS11.4503246720.9366534771.53655.6501.2002.458986S2−11.20402740.0270234951.073S3−16.330222070.221.66720.3531.046−4.98814S44.2003159130.4371319560.924S52.0752116290.221.53655.6500.730−6.26754S61.2353791940.150.637S74.9578747830.221.66720.3530.623−34.5267S84.0070880661.6171486060.713S9−2.4260803480.41.53655.6501.867−5.20057S10−19.774312360.0251.957S11−21.281816150.6420424651.66720.3532.1098.214169S12−4.4093324410.0252.229S13Infinity2.10E−011.51864.1972.432S14Infinity6.39E−012.482ImageInfinity−1.89E−022.725

Meanwhile, an overall focal length F of the second example of the first optical imaging system400bis 6.9262 mm, a focal length f1 of the first lens210is 2.458986 mm, a focal length f2 of the second lens220is −4.98814 mm, a focal length f3 of the third lens230is −6.26754 mm, a focal length f4 of the fourth lens240is −34.5267 mm, a focal length f5 of the fifth lens250is −5.20057 mm, and a focal length f6 of the sixth lens260is 8.214169 mm.

In addition, a field of view (FOV) of the second example of the first optical imaging system400bis 43.7°.

In the second example, the first lens210may have positive refractive power, and a first surface and a second surface thereof may be convex in the paraxial region.

The second lens220may have negative refractive power, and a first surface and a second surface thereof may be concave in the paraxial region.

An optical axis distance between the first lens210and the second lens220may be configured to be relatively short. That is, the first and second lenses210,220may be disposed along the optical axis relatively close to each other.

The first lens210and the second lens220may be formed of plastic having optical characteristics different from each other. For example, the Abbe numbers of the first lens210and the second lens220may be different from each other.

The optical axis distance between the first lens210and the second lens220formed of the plastic having different optical characteristics may be configured to be relatively short to improve chromatic aberration correction performance.

The third lens230may have negative refractive power, and a first surface thereof may be convex in the paraxial region and a second surface thereof may be concave in the paraxial region.

The fourth lens240may have negative refractive power, and a first surface thereof may be convex in the paraxial region and a second surface thereof may be concave in the paraxial region.

An optical axis distance between the third lens230and the fourth lens240may be configured to be relatively short. That is, the third and fourth lenses230,240may be disposed along the optical axis relatively close to each other.

The third lens230and the fourth lens240may be formed of plastic having optical characteristics different from each other. For example, the Abbe numbers of the third lens230and the fourth lens240may be different from each other.

The optical axis distance between the third lens230and the fourth lens240formed of the plastic having different optical characteristics may be configured to be relatively short to improve chromatic aberration correction performance.

In addition, at least one inflection point may be formed on the first surface of the fourth lens240. For example, the first surface of the fourth lens240may be convex in a paraxial region and become concave toward an edge thereof.

In addition, the stop ST may be disposed between the third lens230and the fourth lens240.

The inflection point may be formed on the surface of the lens disposed close to the stop ST to improve correction performance of astigmatism and coma-aberration.

The fifth lens250may have negative refractive power, and a first surface thereof may be concave in the paraxial region and a second surface thereof may be convex in the paraxial region.

In addition, at least one inflection point may be formed on the first surface of the fifth lens250. For example, the first surface of the fifth lens250may be concave in a paraxial region and become convex toward an edge thereof.

The sixth lens260may have positive refractive power, and a first surface thereof may be concave in the paraxial region and a second surface thereof may be convex in the paraxial region.

An optical axis distance between the fifth lens250and the sixth lens260may be configured to be relatively short. That is, the fifth and sixth lenses250,260may be disposed along the optical axis relatively close to each other.

The fifth lens250and the sixth lens260may be formed of plastic having optical characteristics different from each other. For example, the Abbe numbers of the fifth lens250and the sixth lens260may be different from each other.

The optical axis distance between the fifth lens250and the sixth lens260formed of the plastic having different optical characteristics may be configured to be relatively short to improve chromatic aberration correction performance.

Meanwhile, respective surfaces of the first to sixth lenses210to260may have aspherical coefficients as illustrated in Table. 4. For example, all of object-side surfaces and image-side surfaces of the first to sixth lenses210to260may be aspherical surfaces.

TABLE 4S1S2S3S4S5S6R1.450324672−11.2040274−16.330222074.2003159132.0752116291.235379194K−0.1089992860.9988035480.473432126−0.139419309−6.7770586650.138963086A1.09E−240.0372392080.024067335−0.022840984−0.225509683−0.44649055B−4.27E−365.04E−050.0272957350.0905832320.2186390870.305701589C1.00E−47−1.97E−03−0.019630308−0.1583366480.0857738110.025122088D−1.35E−594.29E−040.005197540.2541712−0.452361137−0.098661713E1.03E−71−4.23E−05−0.000306514−0.2673498470.3698303630.040930784F−4.13E−842.03E−06−0.0001580390.136893052−0.121185635−0.00708053G6.79E−97−3.86E−082.52E−05−0.0251069930.0144851070.000462094S7S8S9S10S11S12R4.9578747834.007088066−2.426080348−19.77431236−21.28181615−4.409332441K0.9999999244.703740249−21.30984089−27.0825900697.75024463−2.410568354A−0.118452535−1.05E−19−0.246764617−0.133021884−7.30E−17−1.78E−45B−0.1478713342.44E−300.1783137370.053253335.98E−242.94E−67C0.316026392−3.58E−41−0.059061686−0.012231444−1.98E−31−1.33E−89D−0.3276266333.27E−520.0113610760.0015892432.98E−393.14E−112E0.169384846−1.81E−63−0.00127409−1.11E−04−2.07E−47−4.00E−135F−0.0418210825.54E−757.68E−053.90E−066.58E−562.59E−158G0.003941456−7.14E−87−1.93E−06−5.34E−08−7.79E−65−6.67E−182

In addition, the second example of the first optical imaging system400bconfigured as described above may have aberration characteristics illustrated inFIG.5.

A third example of the first optical imaging system400will be described with reference toFIGS.6and7.

The third example of the first optical imaging system400cmay include an optical system including a first lens310, a second lens320, a third lens330, a fourth lens340, a fifth lens350, and a sixth lens360, and may further include an infrared cut-off filter370, an image sensor380, and a stop ST.

Here, lens characteristics (radii of curvature, thicknesses of lenses or distances between the lenses, refractive indices, Abbe numbers, and effective aperture radii) of each lens are represented in Table 5.

TABLE 5Radius ofThickness orRefractiveAbbeEffectiveFocalExample 3CurvatureDistanceIndexNumberAperture RadiusLengthS11.4275929750.9476671381.53655.6501.2002.616186S2−61.105201470.0251.049S378.596881110.221.66720.3531.026−5.39922S43.4392727960.2595924860.902S52.1666416660.221.53655.6500.791−7.62391S61.3657898420.1132366420.699S73.1383293210.221.66720.3530.686−43.1324S82.7502599861.8300599530.760S9−2.4443440970.41.53655.6501.892−5.16861S10−21.939634430.0300395352.007S11−21.368201180.6294042451.66720.3532.1439.398628S12−4.903613420.0252.261S13Infinity0.211.51864.1972.454S14Infinity0.656618262.502ImageInfinity−0.0361389762.726

Meanwhile, an overall focal length F of the third example of the first optical imaging system400cis 6.927 mm, a focal length f1 of the first lens310is 2.616186 mm, a focal length f2 of the second lens320is −5.39922 mm, a focal length f3 of the third lens330is −7.62391 mm, a focal length f4 of the fourth lens340is −43.1324 mm, a focal length f5 of the fifth lens350is −5.16861 mm, and a focal length f6 of the sixth lens360is 9.398628 mm.

In addition, in the third example, a field of view (FOV) of the first optical imaging system400cis 43.77°.

In the third example, the first lens310may have positive refractive power, and a first surface and a second surface thereof may be convex in the paraxial region.

The second lens320may have negative refractive power, and a first surface thereof may be convex in the paraxial region and a second surface thereof may be concave in the paraxial region.

An optical axis distance between the first lens310and the second lens320may be configured to be relatively short. That is, the first and second lenses310,320may be disposed along the optical axis relatively close to each other.

The first lens310and the second lens320may be formed of plastic having optical characteristics different from each other. For example, the Abbe numbers of the first lens310and the second lens320may be different from each other.

The optical axis distance between the first lens310and the second lens320each formed of plastic having different optical characteristics may be configured so that the first lens310and the second lens320are relatively close to each other to improve chromatic aberration correction performance.

The third lens330may have negative refractive power, and a first surface thereof may be convex in the paraxial region and a second surface thereof may be concave in the paraxial region.

The fourth lens340may have positive refractive power, and a first surface thereof may be convex in the paraxial region and a second surface thereof may be concave in the paraxial region.

An optical axis distance between the third lens330and the fourth lens340may be configured to be relatively short. That is, the third and fourth lenses330,340may be disposed along the optical axis relatively close to each other.

The third lens330and the fourth lens340may be formed of plastic having optical characteristics different from each other. For example, the Abbe numbers of the third lens330and the fourth lens340may be different from each other.

The optical axis distance between the third lens330and the fourth lens340each formed of plastic having different optical characteristics may be configured so that the third lens330and the fourth lens340are relatively close to each other to improve chromatic aberration correction performance.

In addition, at least one inflection point may be formed on the first surface of the fourth lens340. For example, the first surface of the fourth lens340may be convex in a paraxial region and become concave toward an edge thereof.

In addition, the stop ST may be disposed between the third lens330and the fourth lens340.

The inflection point may be formed on the surface of the lens disposed close to the stop ST to improve correction performance of astigmatism and coma-aberration.

The fifth lens350may have negative refractive power, and a first surface thereof may be concave in the paraxial region and a second surface thereof may be convex in the paraxial region.

In addition, at least one inflection point may be formed on the first surface of the fifth lens350. For example, the first surface of the fifth lens350may be concave in the paraxial region and become convex toward an edge thereof.

The sixth lens360may have positive refractive power, and a first surface thereof may be concave in the paraxial region and a second surface thereof may be convex in the paraxial region.

An optical axis distance between the fifth lens350and the sixth lens360may be configured to be relatively short. That is, the fifth and sixth lenses350,360may be disposed along the optical axis relatively close to each other.

The fifth lens350and the sixth lens360may be formed of plastic having optical characteristics different from each other. For example, the Abbe numbers of the fifth lens350and the sixth lens360may be different from each other.

The optical axis distance between the fifth lens350and the sixth lens360each formed of plastic having different optical characteristics may be configured so that the fifth lens350and the sixth lens360are relatively close to each other to improve chromatic aberration correction performance.

Meanwhile, respective surfaces of the first to sixth lenses310to360may have aspherical coefficients as illustrated in Table. 6. For example, all of object-side surfaces and image-side surfaces of the first to sixth lenses310to360may be aspherical surfaces.

TABLE 6S1S2S3S4S5S6R1.427592975−61.1052014778.596881113.4392727962.1666416661.365789842K−0.0475466040.9994733190.473358657−0.093875344−5.482125180.079998285A1.09E−240.0426687460.02395669−0.041645551−0.241683076−0.505530899B−4.27E−364.67E−030.0305601990.1549678810.2484152280.369625906C1.00E−47−4.32E−030.002098445−0.3278882850.27714106−0.016926512D−1.35E−598.92E−04−0.0191222080.715450376−0.804521888−0.081095321E1.03E−71−8.81E−050.00977612−0.8779816740.6065011190.036390072F−4.13E−844.31E−06−0.0020522840.486435606−0.192494979−0.006425488G6.79E−97−8.33E−081.61E−04−0.0966217870.0225830340.000422322S7S8S9S10S11S12R3.1383293212.750259986−2.444344097−21.93963443−21.36820118−4.90361342K13.233332688−22.60105043−27.0825900695.75590308−1.256217694A−0.186840269−1.05E−19−0.238409484−0.122004598−7.30E−17−1.78E−45B−0.1436590112.44E−300.1604159860.0470449385.98E−242.94E−67C0.338475555−3.58E−41−0.051848079−0.009867783−1.98E−31−1.33E−89D−0.3727131913.27E−520.0102940090.0011024092.98E−393.14E−112E0.207680172−1.81E−63−0.001247111−6.58E−05−2.07E−47−4.00E−135F−0.0553888465.54E−758.30E−051.98E−066.58E−562.59E−158G0.005629237−7.14E−87−2.30E−06−2.36E−08−7.79E−65−6.67E−182

In addition, the third example of the first optical imaging system400cconfigured as described above may have aberration characteristics illustrated inFIG.7.

Table 7 summarizes some of the optical characteristics of the first example of the first optical imaging system400a, the second example of the first optical imaging system400b, and the third example of the first optical imaging system400cdescribed above.

TABLE 7Example 1Example 2Example 3TTL5.755.74975.75F6.9276.92626.927FOV43.4343.69643.7667TTL/F0.8300.8300.830D23/D345.3882.9142.292f1/F0.3490.3550.378

In the examples described herein, the optical imaging system which readily performs an aberration correction and has a narrow field of view may be easily applied to a portable electronic device.

While this disclosure includes specific examples, it will be apparent after an understanding of the disclosure of this application that various changes in form and details may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only, and not for purposes of limitation. Descriptions of features or aspects in each example are to be considered as being applicable to similar features or aspects in other examples. Suitable results may be achieved if the described techniques are performed in a different order, and/or if components in a described system, architecture, device, or circuit are combined in a different manner, and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the disclosure is defined not by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.