IMAGE CAPTURING LENS

An image capturing lens sequentially includes a first lens to a seventh lens from an object side to an image side along an optical axis. The first lens has a positive refracting power. The second lens has a negative refracting power. The third lens has a positive refracting power. The fourth lens has a negative refracting power. The fifth lens has a positive refracting power. The fourth lens and the fifth lens form a cemented lens. The sixth lens has a positive refracting power. The seventh lens has a negative refracting power.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of China application no. 202310117990.6, filed on Feb. 15, 2023. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND

Technical Field

The disclosure relates to an optical device; more particularly, the disclosure relates to an image capturing lens.

Description of Related Art

The landscape of portable electronic device specifications is in constant flux, and an optical image capturing lens, as a critical component, is likewise experiencing diversified advancements. In the realm of the image capturing lenses for portable electronic devices, the demand extends beyond merely achieving a larger aperture within a compact system length. There is also a quest for increased pixel count and higher resolution. To cater to diverse design requirements, these image capturing lenses frequently incorporate a plurality of lenses, making the assembly tolerance between each lens a critical concern.

SUMMARY

The disclosure provides an image capturing lens that includes a cemented lens and is capable of reducing an impact of assembly tolerance and improve production yield.

According to an embodiment of the disclosure, an image capturing lens is provided, and the image capturing lens sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens from an object side to an image side along an optical axis. The first lens has a positive refracting power. The second lens has a negative refracting power. The third lens has a positive refracting power. The fourth lens has a negative refracting power. The fifth lens has a positive refracting power, where the fourth lens and the fifth lens form a cemented lens. The sixth lens has a positive refracting power. The seventh lens has a negative refracting power. The image capturing lens satisfies a conditional expression:

where G34 is a gap between the third lens and the fourth lens on the optical axis, G56 is a gap between the fifth lens and the sixth lens on the optical axis, T4 is a thickness of the fourth lens on the optical axis, T5 is a thickness of the fifth lens on the optical axis, and TTL is a distance from an object side surface of the first lens to an image plane of the first lens on the optical axis.

In light of the foregoing, the image capturing lens provided in one or more embodiments of the disclosure includes a cemented lens formed by the fourth lens and the fifth lens, which may prevent the assembly tolerance between the two lenses caused by using discrete fourth and fifth lenses, and the image capturing lens may have good imaging quality. Several exemplary embodiments accompanied with figures are described in detail below to further describe the disclosure in details.

DESCRIPTION OF THE EMBODIMENTS

Please refer toFIG.1, which schematically illustrates an image capturing lens according to a first embodiment of the disclosure. An image capturing lens10provided in the first embodiment of the disclosure sequentially includes an aperture0, a first lens1, a second lens2, a third lens3, a fourth lens4, a fifth lens5, a sixth lens6, a seventh lens7, and a filter8along an optical axis I of the image capturing lens10from an object side A1to an image side A2. When a light beam emitted from an object to be shot enters the image capturing lens10and sequentially passes through the aperture0, the first lens1, the second lens2, the third lens3, the fourth lens4, the fifth lens5, the sixth lens6, the seventh lens7, and the filter8, an image is generated on an image plane99. The filter8, for instance, is an infrared cut-off filter, which allows light beams with appropriate wavelengths (such as infrared or visible light beams) to pass through, and the filter8filters out an infrared band that is desired to be filtered out. The filter8is disposed between the seventh lens7and the image plane99. It should be further noted that the object side A1is a side facing the object to be shot, and the image side A2is a side facing the image plane99.

In the present embodiment, each of the first lens1, the second lens2, the third lens3, the fourth lens4, the fifth lens5, the sixth lens6, the seventh lens7, and the filter8of the optical image capturing lens10has an object side surface15,25,35,45,55,65,75, and85facing the object side A1and allowing an imaging light beam to pass through, and has an image side surface16,26,36,46,56,66,76, and86facing the image side A2and allowing the imaging light beam to pass through. Here, the fourth lens4and the fifth lens5are cemented together through the image side surface46of the fourth lens4and the object side surface55of the fifth lens5, thus forming a cemented lens BL and avoiding an assembly tolerance between the two lenses caused because of using the discrete fourth lens4and fifth lens5. In the present embodiment, the aperture0is set on the object side A1of the first lens1.

The first lens1has a positive refracting power, an optical axis region of the object side surface15of the first lens1has a convex surface, an optical axis region of the image side surface16of the first lens1has a concave surface, and both the object side surface15and the image side surface16are aspheric surfaces. The second lens2has a negative refracting power, an optical axis region of the object side surface25of the second lens2has a convex surface, an optical axis region of the image side surface26of the second lens2has a concave surface, and both the object side surface25and the image side surface26are aspheric surfaces. The third lens3has a positive refracting power, an optical axis region of the object side surface35of the third lens3has a convex surface, an optical axis region of the image side surface36of the third lens3has a convex surface, and both the object side surface35and the image side surface36are aspheric surfaces. The fourth lens4has a negative refracting power, and an optical axis region of the object side surface45of the fourth lens4has a concave surface, which is an aspheric surface. The fifth lens5has a positive refracting power, an optical axis region of the object side surface55of the fifth lens5has a convex surface, an optical axis region of the image side surface56of the fifth lens5has a convex surface, and both the object side surface55and the image side surface56are aspheric surfaces. The sixth lens6has a positive refracting power, an optical axis region of the object side surface65of the sixth lens6has a convex surface, an optical axis region of the image side surface66of the sixth lens6has a concave surface, and both the object side surface65and the image side surface66are aspheric surfaces. The seventh lens7has a negative refracting power, an optical axis region of the object side surface75of the seventh lens7has a concave surface, an optical axis region of the image side surface76of the seventh lens7has a concave surface, and both the object side surface75and the image side surface76are aspheric surfaces. The cemented lens BL may have a positive or negative refracting power. An Abbe number of the fourth lens4falls within a range of 18 to 28, and a refractive index Nd of the fourth lens4falls within a range of 1.6 to 1.95.

Other detailed optical data provided in the first embodiment are shown in Table 1. A field of view (FOV) of the optical image capturing lens10is 380 and a f-stop (F number) is 1.77, which satisfies a conditional expression as follows:

where TTL is a distance from the object side surface15of the first lens to the image plane99on the optical axis I, and ImgH is half the length of a diagonal of an effective pixel region on the image plane99.

In Table 1, a pitch of the object side surface15(as shown in Table 1 as 0.628 mm) is a thickness of the first lens1on the optical axis I, and a pitch of the image side surface16(as shown in Table 1 as 0.332 mm) is the distance on the optical axis I between the image side surface16of the first lens1and the object side surface25of the second lens2, i.e., a gap on the optical axis I between the first lens1and the second lens2, and the rest may be deduced therefrom.

In the present embodiment, the object side surfaces15,25,35,45,55,65, and75and image side surfaces16,26,36,46,56,66, and76of the first lens1, the second lens2, the third lens3, the fourth lens4, the fifth lens5, the sixth lens6, and the seventh lens7are all aspheric surfaces, and these aspheric surfaces are defined by a formula below:

Z⁡(Y)=Y2R/(1+1-(1+K)⁢Y2R2)+∑i=1na2⁢i×Y2⁢i(1)Y: a distance between a point on an aspheric curve and the optical axis;Z: an aspheric depth, i.e., a vertical distance between a point located on the aspheric surface and spaced from the optical axis by a distance Y and a tangent plane tangent to a vertex of the aspheric surface on the optical axis;R: a curvature radius of the lens surface;K: conic coefficient;a2i: the 2i-th order aspheric coefficient.

In the present embodiment, the conic coefficient K and various aspheric coefficients of the above-mentioned aspheric surface in the formula (1) are as shown in Table 2. In Table 2, the column numbered as 15 indicates that it refers to the aspheric coefficient of the object side surface15of the first lens1, and the rest may be deduced therefrom for other numbered columns.

Please refer toFIG.2AtoFIG.2D.FIG.2Ais a schematic view illustrating astigmatism of the image capturing lens according to the first embodiment,FIG.2Bis a schematic view illustrating vertical chromatic aberration of the image capturing lens according to the first embodiment,FIG.2Cis a schematic view illustrating axial aberration of the image capturing lens according to the first embodiment, andFIG.2Dis a schematic view illustrating distortion of the image capturing lens according to the first embodiment.

As shown inFIG.2A, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, the astigmatism of each color beam at different FOV falls within a range of ±0.10 mm. With reference toFIG.2B, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, on the image plane99perpendicular to the optical axis I, the position of the 550 nm color beam is taken as the reference zero, and the position differences of the 465 nm and 630 nm color beams are compared. As shown inFIG.2B, which schematically illustrates the vertical chromatic aberration, it may be learned that the vertical chromatic aberration of the image capturing lens10at different FOVs falls within a range of a diffraction limit (shown as the dotted line inFIG.2B), and falls within a range of ±2.0 μm. With reference toFIG.2C, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, the imaging position on the optical axis I varies with different aperture angles, thus generating the axial aberration, and the axial aberration of each color beam falls within the range of ±0.10 mm. The distortion aberration diagram inFIG.2Dshows that the distortion aberration of the image capturing lens10remains within a range of ±1%. ThroughFIG.2AtoFIG.2D, it is demonstrated that the image capturing lens10provided in the first embodiment has good imaging quality.

In order to fully demonstrate various embodiments of the disclosure, other embodiments of the disclosure are described below. Note that the reference numbers and some content provided in the previous embodiments are also used in the following embodiments, where the same reference numbers serve to represent the same or similar components, and the description of the same technical content is omitted. The description of the omitted parts may be referred to as those provided in the previous embodiments and will not be repeated hereinafter.

Please refer toFIG.3, which schematically illustrates an image capturing lens according to a second embodiment of the disclosure. The image capturing lens10provided in the second embodiment of the disclosure sequentially includes an aperture0, a first lens1, a second lens2, a third lens3, a fourth lens4, a fifth lens5, a sixth lens6, a seventh lens7, and a filter8along the optical axis I of the image capturing lens10from the object side A1to the image side A2. When the light emitted by an object to be shot enters the image capturing lens10and sequentially passes through the aperture0, the first lens1, the second lens2, the third lens3, the fourth lens4, the fifth lens5, the sixth lens6, the seventh lens7, and the filter8, an image is generated on the image plane99. The fourth lens4and the fifth lens5are cemented together through the image side surface46of the fourth lens4and the object side surface55of the fifth lens5, thus forming a cemented lens BL. In the present embodiment, the aperture0is set on the object side A1of the first lens1.

The first lens1has a positive refracting power, the optical axis region of the object side surface15of the first lens1has a convex surface, the optical axis region of the image side surface16of the first lens1has a concave surface, and both the object side surface15and the image side surface16are aspheric surfaces. The second lens2has a negative refracting power, the optical axis region of the object side surface25of the second lens2has a convex surface, the optical axis region of the image side surface26of the second lens2has a concave surface, and both the object side surface25and the image side surface26are aspheric surfaces. The third lens3has a positive refracting power, the optical axis region of the object side surface35of the third lens3has a convex surface, the optical axis region of the image side surface36of the third lens3has a convex surface, and both the object side surface35and the image side surface36are aspheric surfaces. The fourth lens4has a negative refracting power, and the optical axis region of the object side surface45of the fourth lens4has a concave surface, which is an aspheric surface. The fifth lens5has a positive refracting power, the optical axis region of the object side surface55of the fifth lens5has a convex surface, the optical axis region of the image side surface56of the fifth lens5has a convex surface, and both the object side surface55and the image side surface56are aspheric surfaces. The sixth lens6has a positive refracting power, the optical axis region of the object side surface65of the sixth lens6has a convex surface, the optical axis region of the image side surface66of the sixth lens6has a concave surface, and both the object side surface65and the image side surface66are aspheric surfaces. The seventh lens7has a negative refracting power, the optical axis region of the object side surface75of the seventh lens7has a concave surface, the optical axis region of the image side surface76of the seventh lens7has a concave surface, and both the object side surface75and the image side surface76are aspheric surfaces. The cemented lens BL may have a positive or negative refracting power. The Abbe number of the fourth lens4falls within a range of 18 to 28, and the refractive index Nd of the fourth lens4falls within a range of 1.6 to 1.95.

Other detailed optical data provided in the second embodiment are shown in Table 3. The FOV of the optical image capturing lens10is 380 and the f-stop (F number) is 1.77, which satisfies a conditional expression as follows:

where TTL is the distance from the object side surface15of the first lens1to the image plane99on the optical axis I, and ImgH is half the length of the diagonal of the effective pixel region on the image plane99.

In the present embodiment, the object side surfaces15,25,35,45,55,65, and75and image side surfaces16,26,36,46,56,66, and76of the first lens1, the second lens2, the third lens3, the fourth lens4, the fifth lens5, the sixth lens6, and the seventh lens7are all aspheric surfaces, and these aspheric surfaces are defined by the above-mentioned formula (1).

In the present embodiment, the conic coefficient K and various aspheric coefficients of the above-mentioned aspheric surface in the formula (1) are as shown in Table 4. In Table 4, the column numbered as 15 indicates that it refers to the aspheric coefficient of the object side surface15of the first lens1, and the rest may be deduced therefrom for other numbered columns.

Please refer toFIG.4AtoFIG.4D.FIG.4Ais a schematic view illustrating astigmatism of the image capturing lens according to the second embodiment,FIG.4Bis a schematic view illustrating vertical chromatic aberration of the image capturing lens according to the second embodiment,FIG.4Cis a schematic view illustrating axial aberration of the image capturing lens according to the second embodiment, andFIG.4Dis a schematic view illustrating distortion of the image capturing lens according to the second embodiment.

As shown inFIG.4A, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, the astigmatism of each color beam at different FOV falls within a range of ±0.20 mm. With reference toFIG.4B, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, on the image plane99perpendicular to the optical axis I, the position of the 550 nm color beam is taken as the reference zero, and the position differences of the 465 nm and 630 nm color beams are compared. As shown inFIG.4B, which schematically illustrates the vertical chromatic aberration, it may be learned that the vertical chromatic aberration of the image capturing lens10at different FOVs falls within a range of a diffraction limit (shown as the dotted line inFIG.4B), and falls within a range of ±3.0 μm. With reference toFIG.4C, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, the imaging position on the optical axis I varies with different aperture angles, thus generating the axial aberration, and the axial aberration of each color beam falls within the range of ±0.12 mm. The distortion aberration diagram inFIG.4Dshows that the distortion aberration of the image capturing lens10remains within a range of ±1%. ThroughFIG.4AtoFIG.4D, it is demonstrated that the image capturing lens10provided in the second embodiment has good imaging quality.

Please refer toFIG.5, which schematically illustrates an image capturing lens according to a third embodiment of the disclosure. The image capturing lens10provided in the third embodiment of the disclosure sequentially includes an aperture0, a first lens1, a second lens2, a third lens3, a fourth lens4, a fifth lens5, a sixth lens6, a seventh lens7, and a filter8along the optical axis I of the image capturing lens10from the object side A1to the image side A2. When the light emitted by an object to be shot enters the image capturing lens10and sequentially passes through the aperture0, the first lens1, the second lens2, the third lens3, the fourth lens4, the fifth lens5, the sixth lens6, the seventh lens7, and the filter8, an image is generated on the image plane99. The fourth lens4and the fifth lens5are cemented together through the image side surface46of the fourth lens4and the object side surface55of the fifth lens5, thus forming a cemented lens BL. In the present embodiment, the aperture0is set on the object side A1of the first lens1.

The first lens1has a positive refracting power, the optical axis region of the object side surface15of the first lens1has a convex surface, the optical axis region of the image side surface16of the first lens1has a concave surface, and both the object side surface15and the image side surface16are aspheric surfaces. The second lens2has a negative refracting power, the optical axis region of the object side surface25of the second lens2has a convex surface, the optical axis region of the image side surface26of the second lens2has a concave surface, and both the object side surface25and the image side surface26are aspheric surfaces. The third lens3has a positive refracting power, the optical axis region of the object side surface35of the third lens3has a convex surface, the optical axis region of the image side surface36of the third lens3has a convex surface, and both the object side surface35and the image side surface36are aspheric surfaces. The fourth lens4has a negative refracting power, and the optical axis region of the object side surface45of the fourth lens4has a concave surface, which is an aspheric surface. The fifth lens5has a positive refracting power, the optical axis region of the object side surface55of the fifth lens5has a convex surface, the optical axis region of the image side surface56of the fifth lens5has a convex surface, and both the object side surface55and the image side surface56are aspheric surfaces. The sixth lens6has a positive refracting power, the optical axis region of the object side surface65of the sixth lens6has a convex surface, the optical axis region of the image side surface66of the sixth lens6has a concave surface, and both the object side surface65and the image side surface66are aspheric surfaces. The seventh lens7has a negative refracting power, the optical axis region of the object side surface75of the seventh lens7has a concave surface, the optical axis region of the image side surface76of the seventh lens7has a concave surface, and both the object side surface75and the image side surface76are aspheric surfaces. The cemented lens BL may have a positive or negative refracting power. The Abbe number of the fourth lens4falls within a range of 18 to 28, and the refractive index Nd of the fourth lens4falls within a range of 1.6 to 1.95.

Other detailed optical data provided in the third embodiment are shown in Table 5. The FOV of the optical image capturing lens10is 380 and the f-stop (F number) is 1.77, which satisfies a conditional expression as follows:

where TTL is the distance from the object side surface15of the first lens1to the image plane99on the optical axis I, and ImgH is half the length of the diagonal of the effective pixel region on the image plane99.

In the present embodiment, the object side surfaces15,25,35,45,55,65, and75and image side surfaces16,26,36,46,56,66, and76of the first lens1, the second lens2, the third lens3, the fourth lens4, the fifth lens5, the sixth lens6, and the seventh lens7are all aspheric surfaces, and these aspheric surfaces are defined by the above-mentioned formula (1).

In the present embodiment, the conic coefficient K and various aspheric coefficients of the above-mentioned aspheric surface in the formula (1) are as shown in Table 6. In Table 6, the column numbered as 15 indicates that it refers to the aspheric coefficient of the object side surface15of the first lens1, and the rest may be deduced therefrom for other numbered columns.

Please refer toFIG.6AtoFIG.6D.FIG.6Ais a schematic view illustrating astigmatism of the image capturing lens according to the third embodiment,FIG.6Bis a schematic view illustrating vertical chromatic aberration of the image capturing lens according to the third embodiment,FIG.6Cis a schematic view illustrating axial aberration of the image capturing lens according to the third embodiment, andFIG.6Dis a schematic view illustrating distortion of the image capturing lens according to the third embodiment.

As shown inFIG.6A, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, the astigmatism of each color beam at different FOV falls within a range of ±0.20 mm. With reference toFIG.6B, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, on the image plane99perpendicular to the optical axis I, the position of the 550 nm color beam is taken as the reference zero, and the position differences of the 465 nm and 630 nm color beams are compared. As shown inFIG.6B, which schematically illustrates the vertical chromatic aberration, it may be learned that the vertical chromatic aberration of the image capturing lens10at different FOVs falls within a range of a diffraction limit (shown as the dotted line inFIG.6B), and falls within a range of ±2.0 μm. With reference toFIG.6C, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, the imaging position on the optical axis I varies with different aperture angles, thus generating the axial aberration, and the axial aberration of each color beam falls within the range of ±0.16 mm. The distortion aberration diagram inFIG.6Dshows that the distortion aberration of the image capturing lens10remains within a range of ±1%. ThroughFIG.6AtoFIG.6D, it is demonstrated that the image capturing lens10provided in the third embodiment has good imaging quality.

Please refer toFIG.7, which schematically illustrates an image capturing lens according to a fourth embodiment of the disclosure. The image capturing lens10provided in the fourth embodiment of the disclosure sequentially includes an aperture0, a first lens1, a second lens2, a third lens3, a fourth lens4, a fifth lens5, a sixth lens6, a seventh lens7, and a filter8along the optical axis I of the image capturing lens10from the object side A1to the image side A2. When the light emitted by an object to be shot enters the image capturing lens10and sequentially passes through the aperture0, the first lens1, the second lens2, the third lens3, the fourth lens4, the fifth lens5, the sixth lens6, the seventh lens7, and the filter8, an image is generated on the image plane99. The fourth lens4and the fifth lens5are cemented together through the image side surface46of the fourth lens4and the object side surface55of the fifth lens5, thus forming a cemented lens BL. In the present embodiment, the aperture0is set on the object side A1of the first lens1.

The first lens1has a positive refracting power, the optical axis region of the object side surface15of the first lens1has a convex surface, the optical axis region of the image side surface16of the first lens1has a convex surface, and both the object side surface15and the image side surface16are aspheric surfaces. The second lens2has a negative refracting power, the optical axis region of the object side surface25of the second lens2has a convex surface, the optical axis region of the image side surface26of the second lens2has a concave surface, and both the object side surface25and the image side surface26are aspheric surfaces. The third lens3has a positive refracting power, the optical axis region of the object side surface35of the third lens3has a convex surface, the optical axis region of the image side surface36of the third lens3has a convex surface, and both the object side surface35and the image side surface36are aspheric surfaces. The fourth lens4has a negative refracting power, and the optical axis region of the object side surface45of the fourth lens4has a concave surface, which is an aspheric surface. The fifth lens5has a positive refracting power, the optical axis region of the object side surface55of the fifth lens5has a concave surface, the optical axis region of the image side surface56of the fifth lens5has a convex surface, and both the object side surface55and the image side surface56are aspheric surfaces. The sixth lens6has a positive refracting power, the optical axis region of the object side surface65of the sixth lens6has a convex surface, the optical axis region of the image side surface66of the sixth lens6has a concave surface, and both the object side surface65and the image side surface66are aspheric surfaces. The seventh lens7has a negative refracting power, the optical axis region of the object side surface75of the seventh lens7has a concave surface, the optical axis region of the image side surface76of the seventh lens7has a concave surface, and both the object side surface75and the image side surface76are aspheric surfaces. The cemented lens BL may have a positive or negative refracting power. The Abbe number of the fourth lens4falls within a range of 18 to 28, and the refractive index Nd of the fourth lens4falls within a range of 1.6 to 1.95.

Other detailed optical data provided in the fourth embodiment are shown in Table 7. The FOV of the optical image capturing lens10is 380 and the f-stop (F number) is 1.87, which satisfies a conditional expression as follows:

where TTL is the distance from the object side surface15of the first lens1to the image plane99on the optical axis I, and ImgH is half the length of the diagonal of the effective pixel region on the image plane99.

In the present embodiment, the object side surfaces15,25,35,45,55,65, and75and image side surfaces16,26,36,46,56,66, and76of the first lens1, the second lens2, the third lens3, the fourth lens4, the fifth lens5, the sixth lens6, and the seventh lens7are all aspheric surfaces, and these aspheric surfaces are defined by the above-mentioned formula (1).

In the present embodiment, the conic coefficient K and various aspheric coefficients of the above-mentioned aspheric surface in the formula (1) are as shown in Table 8. In Table 8, the column numbered as15indicates that it refers to the aspheric coefficient of the object side surface15of the first lens1, and the rest may be deduced therefrom for other numbered columns.

Please refer toFIG.8AtoFIG.8D.FIG.8Ais a schematic view illustrating astigmatism of the image capturing lens according to the fourth embodiment,FIG.8Bis a schematic view illustrating vertical chromatic aberration of the image capturing lens according to the fourth embodiment,FIG.8Cis a schematic view illustrating axial aberration of the image capturing lens according to the fourth embodiment, andFIG.8Dis a schematic view illustrating distortion of the image capturing lens according to the fourth embodiment.

As shown inFIG.8A, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, the astigmatism of each color beam at different FOV falls within a range of ±0.10 mm. With reference toFIG.8B, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, on the image plane99perpendicular to the optical axis I, the position of the 550 nm color beam is taken as the reference zero, and the position differences of the 465 nm and 630 nm color beams are compared. As shown inFIG.8B, which schematically illustrates the vertical chromatic aberration, it may be learned that the vertical chromatic aberration of the image capturing lens10at different FOVs falls within a range of a diffraction limit (shown as the dotted line inFIG.8B), and falls within a range of ±3.0 μm. With reference toFIG.8C, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, the imaging position on the optical axis I varies with different aperture angles, thus generating the axial aberration, and the axial aberration of each color beam falls within the range of ±0.10 mm. The distortion aberration diagram inFIG.8Dshows that the distortion aberration of the image capturing lens10remains within a range of ±1%. ThroughFIG.8AtoFIG.8D, it is demonstrated that the image capturing lens10provided in the fourth embodiment has good imaging quality.

Please refer toFIG.9, which schematically illustrates an image capturing lens according to a fifth embodiment of the disclosure. The image capturing lens10provided in the fifth embodiment of the disclosure sequentially includes an aperture0, a first lens1, a second lens2, a third lens3, a fourth lens4, a fifth lens5, a sixth lens6, a seventh lens7, and a filter8along the optical axis I of the image capturing lens10from the object side A1to the image side A2. When the light emitted by an object to be shot enters the image capturing lens10and sequentially passes through the aperture0, the first lens1, the second lens2, the third lens3, the fourth lens4, the fifth lens5, the sixth lens6, the seventh lens7, and the filter8, an image is generated on the image plane99. The fourth lens4and the fifth lens5are cemented together through the image side surface46of the fourth lens4and the object side surface55of the fifth lens5, thus forming a cemented lens BL. In the present embodiment, the aperture0is set on the object side A1of the first lens1.

The first lens1has a positive refracting power, the optical axis region of the object side surface15of the first lens1has a convex surface, the optical axis region of the image side surface16of the first lens1has a concave surface, and both the object side surface15and the image side surface16are aspheric surfaces. The second lens2has a negative refracting power, the optical axis region of the object side surface25of the second lens2has a convex surface, the optical axis region of the image side surface26of the second lens2has a concave surface, and both the object side surface25and the image side surface26are aspheric surfaces. The third lens3has a positive refracting power, the optical axis region of the object side surface35of the third lens3has a convex surface, the optical axis region of the image side surface36of the third lens3has a convex surface, and both the object side surface35and the image side surface36are aspheric surfaces. The fourth lens4has a negative refracting power, and the optical axis region of the object side surface45of the fourth lens4has a concave surface, which is an aspheric surface. The fifth lens5has a positive refracting power, the optical axis region of the object side surface55of the fifth lens5has a convex surface, the optical axis region of the image side surface56of the fifth lens5has a convex surface, and both the object side surface55and the image side surface56are aspheric surfaces. The sixth lens6has a positive refracting power, the optical axis region of the object side surface65of the sixth lens6has a convex surface, the optical axis region of the image side surface66of the sixth lens6has a concave surface, and both the object side surface65and the image side surface66are aspheric surfaces. The seventh lens7has a negative refracting power, the optical axis region of the object side surface75of the seventh lens7has a concave surface, the optical axis region of the image side surface76of the seventh lens7has a concave surface, and both the object side surface75and the image side surface76are aspheric surfaces. The cemented lens BL may have a positive or negative refracting power. The Abbe number of the fourth lens4falls within a range of 18 to 28, and the refractive index Nd of the fourth lens4falls within a range of 1.6 to 1.95.

Other detailed optical data provided in the fifth embodiment are shown in Table 9. The FOV of the optical image capturing lens10is 380 and the f-stop (F number) is 1.8, which satisfies a conditional expression as follows:

where TTL is the distance from the object side surface15of the first lens1to the image plane99on the optical axis I, and ImgH is half the length of the diagonal of the effective pixel region on the image plane99.

In the present embodiment, the object side surfaces15,25,35,45,55,65, and75and image side surfaces16,26,36,46,56,66, and76of the first lens1, the second lens2, the third lens3, the fourth lens4, the fifth lens5, the sixth lens6, and the seventh lens7are all aspheric surfaces, and these aspheric surfaces are defined by the above-mentioned formula (1).

In the present embodiment, the conic coefficient K and various aspheric coefficients of the above-mentioned aspheric surface in the formula (1) are as shown in Table 10. In Table 10, the column numbered as15indicates that it refers to the aspheric coefficient of the object side surface15of the first lens1, and the rest may be deduced therefrom for other numbered columns.

Please refer toFIG.10AtoFIG.10D.FIG.10Ais a schematic view illustrating astigmatism of the image capturing lens according to the fifth embodiment,FIG.10Bis a schematic view illustrating vertical chromatic aberration of the image capturing lens according to the fifth embodiment,FIG.10Cis a schematic view illustrating axial aberration of the image capturing lens according to the fifth embodiment, andFIG.10Dis a schematic view illustrating distortion of the image capturing lens according to the fifth embodiment.

As shown inFIG.10A, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, the astigmatism of each color beam at different FOV falls within a range of ±0.10 mm. With reference toFIG.10B, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, on the image plane99perpendicular to the optical axis I, the position of the 550 nm color beam is taken as the reference zero, and the position differences of the 465 nm and 630 nm color beams are compared. As shown inFIG.10B, which schematically illustrates the vertical chromatic aberration, it may be learned that the vertical chromatic aberration of the image capturing lens10at different FOVs falls within a range of a diffraction limit (shown as the dotted line inFIG.10B), and falls within a range of ±3.0 μm. With reference toFIG.10C, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, the imaging position on the optical axis I varies with different aperture angles, thus generating the axial aberration, and the axial aberration of each color beam falls within the range of ±0.04 mm. The distortion aberration diagram inFIG.10Dshows that the distortion aberration of the image capturing lens10remains within a range of ±2%. ThroughFIG.10AtoFIG.10D, it is demonstrated that the image capturing lens10provided in the fifth embodiment has good imaging quality.

Please refer toFIG.11, which schematically illustrates an image capturing lens according to a sixth embodiment of the disclosure. The image capturing lens10provided in the sixth embodiment of the disclosure sequentially includes an aperture0, a first lens1, a second lens2, a third lens3, a fourth lens4, a fifth lens5, a sixth lens6, a seventh lens7, and a filter8along the optical axis I of the image capturing lens10from the object side A1to the image side A2. When the light emitted by an object to be shot enters the image capturing lens10and sequentially passes through the aperture0, the first lens1, the second lens2, the third lens3, the fourth lens4, the fifth lens5, the sixth lens6, the seventh lens7, and the filter8, an image is generated on the image plane99. The fourth lens4and the fifth lens5are cemented together through the image side surface46of the fourth lens4and the object side surface55of the fifth lens5, thus forming a cemented lens BL. In the present embodiment, the aperture0is set on the object side A1of the first lens1.

The first lens1has a positive refracting power, the optical axis region of the object side surface15of the first lens1has a convex surface, the optical axis region of the image side surface16of the first lens1has a convex surface, and both the object side surface15and the image side surface16are aspheric surfaces. The second lens2has a negative refracting power, the optical axis region of the object side surface25of the second lens2has a convex surface, the optical axis region of the image side surface26of the second lens2has a concave surface, and both the object side surface25and the image side surface26are aspheric surfaces. The third lens3has a positive refracting power, the optical axis region of the object side surface35of the third lens3has a convex surface, the optical axis region of the image side surface36of the third lens3has a convex surface, and both the object side surface35and the image side surface36are aspheric surfaces. The fourth lens4has a negative refracting power, and the optical axis region of the object side surface45of the fourth lens4has a concave surface, which is an aspheric surface. The fifth lens5has a positive refracting power, the optical axis region of the object side surface55of the fifth lens5has a concave surface, the optical axis region of the image side surface56of the fifth lens5has a convex surface, and both the object side surface55and the image side surface56are aspheric surfaces. The sixth lens6has a positive refracting power, the optical axis region of the object side surface65of the sixth lens6has a convex surface, the optical axis region of the image side surface66of the sixth lens6has a concave surface, and both the object side surface65and the image side surface66are aspheric surfaces. The seventh lens7has a negative refracting power, the optical axis region of the object side surface75of the seventh lens7has a concave surface, the optical axis region of the image side surface76of the seventh lens7has a concave surface, and both the object side surface75and the image side surface76are aspheric surfaces. The cemented lens BL may have a positive or negative refracting power. The Abbe number of the fourth lens4falls within a range of 18 to 28, and the refractive index Nd of the fourth lens4falls within a range of 1.6 to 1.95.

Other detailed optical data provided in the sixth embodiment are shown in Table 11. The FOV of the optical image capturing lens10is 380 and the f-stop (F number) is 1.87, which satisfies a conditional expression as follows:

where TTL is the distance from the object side surface15of the first lens1to the image plane99on the optical axis I, and ImgH is half the length of the diagonal of the effective pixel region on the image plane99.

In the present embodiment, the object side surfaces15,25,35,45,55,65, and75and image side surfaces16,26,36,46,56,66, and76of the first lens1, the second lens2, the third lens3, the fourth lens4, the fifth lens5, the sixth lens6, and the seventh lens7are all aspheric surfaces, and these aspheric surfaces are defined by the above-mentioned formula (1).

In the present embodiment, the conic coefficient K and various aspheric coefficients of the above-mentioned aspheric surface in the formula (1) are as shown in Table 12. In Table 12, the column numbered as15indicates that it refers to the aspheric coefficient of the object side surface15of the first lens1, and the rest may be deduced therefrom for other numbered columns.

Please refer toFIG.12AtoFIG.12D.FIG.12Ais a schematic view illustrating astigmatism of the image capturing lens according to the sixth embodiment,FIG.12Bis a schematic view illustrating vertical chromatic aberration of the image capturing lens according to the sixth embodiment,FIG.12Cis a schematic view illustrating axial aberration of the image capturing lens according to the sixth embodiment, andFIG.12Dis a schematic view illustrating distortion of the image capturing lens according to the sixth embodiment.

As shown inFIG.12A, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, the astigmatism of each color beam at different FOV falls within a range of ±0.05 mm. With reference toFIG.12B, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, on the image plane99perpendicular to the optical axis I, the position of the 550 nm color beam is taken as the reference zero, and the position differences of the 465 nm and 630 nm color beams are compared. As shown inFIG.12B, which schematically illustrates the vertical chromatic aberration, it may be learned that the vertical chromatic aberration of the image capturing lens10at different FOVs falls within a range of a diffraction limit (shown as the dotted line inFIG.12B), and falls within a range of ±2.0 μm. With reference toFIG.12C, when different color beams with wavelengths of 465 nm, 550 nm, and 630 nm respectively are incident to the image capturing lens10, the imaging position on the optical axis I varies with different aperture angles, thus generating the axial aberration, and the axial aberration of each color beam falls within the range of ±0.14 mm. The distortion aberration diagram inFIG.12Dshows that the distortion aberration of the image capturing lens10remains within a range of ±2%. ThroughFIG.12AtoFIG.12D, it is demonstrated that the image capturing lens10provided in the sixth embodiment has good imaging quality.

The image capturing lens10provided in the previous embodiments satisfies a conditional expression as follows:

where G34 refers to a gap on the optical axis I between the third lens3and the fourth lens4, G56 refers to a gap on the optical axis I between the fifth lens5and the sixth lens6, T4 refers to a thickness of the fourth lens4on the optical axis I, T5 refers to a thickness of the fifth lens5on the optical axis I, and TTL refers to a distance from the object side surface15of the first lens1to the image plane99of the first lens1on the optical axis I.

The image capturing lens10provided in the previous embodiments satisfies a conditional expression as follows:

where L1R1 refers to a curvature radius of the object side surface15of the first lens1in an optical axis region, and L1R2 refers to a curvature radius of the image side surface16of the first lens1in the optical axis region.

The image capturing lens10provided in the previous embodiments satisfies a conditional expression as follows:

where T1 is a thickness of the first lens1on the optical axis I, T2 is a thickness of the second lens2on the optical axis I, T3 is a thickness of the third lens3on the optical axis I, G12 is a gap between the first lens1and the second lens2on the optical axis I, and G23 is a gap between the second lens2and the third lens3on the optical axis I.

The image capturing lens10provided in the previous embodiments satisfies a conditional expression as follows:

where L4R1 is a curvature radius of the object side surface45of the fourth lens4in the optical axis region, and L5R2 is a curvature radius of the image side surface46of the fifth lens5in the optical axis region.

The image capturing lens10provided in the previous embodiments satisfies a conditional expression as follows:

where L6R1 is a curvature radius of the object side surface65of the sixth lens6in the optical axis region, and L6R2 is a curvature radius of the image side surface66of the sixth lens6in the optical axis region.

In some embodiments of the disclosure, the image capturing lens10psatisfies a conditional expression as follows:

where ImgH is half the length of the diagonal of the effective pixel region on the image plane99, and the f-number of the image capturing lens10falls within a range of 1.7 to 1.9.

To sum up, the image capturing lens provided in one or more embodiments of the disclosure includes the cemented lens formed by the fourth lens and the fifth lens, which may prevent the assembly tolerance between the two lenses caused by using discrete fourth and fifth lenses, and the image capturing lens may have good imaging quality.