Compound lens

Abstract

A composite lens includes six coaxially aligned lenses: (i) a first substrate and a first lens, and, in order of increasing distance and on the same side, (ii) a second lens, a second substrate, a third lens, a third substrate, a fourth lens, a fifth lens, a fourth substrate, and a sixth lens. The first and fifth lenses are negative lenses. The second and fourth lenses are positive lenses.

Description

Technical Field

[0001] This disclosure relates to a compound lens. Background Technology

[0002] Medical endoscopes, machine vision, eye / face tracking, and other applications require compact cameras that can capture high-quality images with a wide field of view and can be manufactured using low-cost processes compatible with mass production.

[0003] Four-lens optical systems are designed to improve the image quality of three-lens optical systems and provide smaller lens sizes. Typically, a three-lens optical system provides a camera with a resolution of 400 pixels × 400 pixels, a pixel size of 1–1.75 micrometers, and a field of view (FOV) of 90–120 degrees. Furthermore, a four-lens optical system can provide a camera with a resolution of 1000 pixels × 1000 pixels, a pixel size of 1–2.2 micrometers, and a FOV of 120 degrees. However, for cameras requiring higher sensor resolution and ultra-wide FOVs, a powerful lens system with more lens surfaces may be needed to reduce lateral ray aberrations and achieve good image quality. For example, a target-lens optical system can provide a camera with a resolution of 1400 pixels × 1400 pixels and an FOV greater than 130 degrees. Summary of the Invention

[0004] This disclosure relates to a composite lens that can provide higher sensor resolution and an ultra-wide field of view (FOV).

[0005] A composite lens comprises six coaxially aligned lenses: (i) a first substrate and a first lens, and, in increasing order of distance and on the same side, (ii) a second lens, a second substrate, a third lens, a third substrate, a fourth lens, a fifth lens, a fourth substrate, and a sixth lens. The first and fifth lenses are negative lenses. The second and fourth lenses are positive lenses.

[0006] Based on the above, the composite lens in this embodiment includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and the refractive power of the lenses is designed such that the first and fifth lenses are negative lenses, and the second and fourth lenses are positive lenses. Therefore, compared with a four-lens optical system or a three-lens optical system, the composite lens in this embodiment can provide good imaging quality, higher sensor resolution, and an ultra-wide field of view (FOV).

[0007] To make the foregoing more understandable, several embodiments accompanied by the accompanying drawings are described in detail below. Attached Figure Description

[0008] The accompanying drawings are included to provide a further understanding of this disclosure and are incorporated in and form a part of this specification. The drawings illustrate exemplary embodiments of this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0009] Figure 1 A cross-sectional view of a ventricle including a lesion in one embodiment, the lesion being imaged by an endoscopic camera including a compound lens;

[0010] Figure 2A This is a schematic cross-sectional view of a compound lens. Figure 1 The first embodiment of the composite lens;

[0011] Figure 2B for Figure 2A A schematic diagram illustrating the definition of the diagonal diameter of the image plane;

[0012] Figures 3A to 3D According to Figure 2A A graph showing the longitudinal spherical aberration and various aberrations of the compound lens in the first embodiment;

[0013] Figure 3E According to Figure 2A A graph showing the lateral chromatic aberration of the composite lens in the first embodiment;

[0014] Figure 3F According to Figure 2A A graph showing the focal offset of the composite lens in the first embodiment with respect to different wavelengths;

[0015] Figure 4 This is a schematic cross-sectional view of a compound lens. Figure 1 A second embodiment of the composite lens;

[0016] Figures 5A to 5D According to Figure 4 A graph showing the longitudinal spherical aberration and various aberrations of the compound lens in the second embodiment;

[0017] Figure 5E According to Figure 4 A graph showing the lateral chromatic aberration of the composite lens in the second embodiment;

[0018] Figure 5F According to Figure 4 A graph showing the focal offset of the composite lens in the second embodiment with respect to different wavelengths;

[0019] Figure 6 This is a schematic cross-sectional view of a compound lens. Figure 1 The third embodiment of the composite lens;

[0020] Figures 7A to 7D According to Figure 6A graph showing the longitudinal spherical aberration and various aberrations of the compound lens in the third embodiment;

[0021] Figure 7E According to Figure 6 A graph showing the lateral chromatic aberration of the composite lens in the third embodiment;

[0022] Figure 7F According to Figure 6 A graph showing the focal offset of the composite lens in the third embodiment with respect to different wavelengths. Detailed Implementation

[0023] Figure 1 This is a cross-sectional view of a ventricle including a lesion, imaged by an endoscopic camera including a compound lens, in one embodiment. (See reference...) Figure 1 , Figure 1 The illustration shows an endoscope 195 inside a ventricle 190, which includes a lesion 192. The lesion 192 is located on the lateral wall 191 of the ventricle. The ventricle 190 may be, for example, part of the esophagus or intestine. The endoscope 195 includes a camera 180 for imaging the lesion 192. The camera 180 includes a lens 182 that partially determines the viewing angle 188 of the camera 180. Without departing from the scope of this document, the camera 180 may be part of a device other than an endoscope, such as a surveillance camera, mobile device, or other consumer electronics.

[0024] Figure 2A This is a schematic cross-sectional view of a compound lens. Figure 1 The first embodiment of the compound lens. See also... Figure 2A , Figure 2A Display compound lens 200, which is Figure 1 An example of lens 182 in camera 180. The compound lens 200 includes six lenses coaxially aligned along optical axis 201: (i) a first substrate 270 and a first lens 210, and, in increasing order of distance and on the same side, (ii) a second lens 220, a second substrate 280, a third lens 230, a third substrate 290, a fourth lens 240, a fifth lens 250, a fourth substrate 2000, and a sixth lens 260. The first lens 210 and the fifth lens 250 are negative lenses (i.e., having negative refractive power). The second lens 220 and the fourth lens 240 are positive lenses (i.e., having positive refractive power).

[0025] Specifically, in this embodiment, the first substrate 270, the first lens 210, the second lens 220, the second substrate 280, the third lens 230, the third substrate 290, the fourth lens 240, the fifth lens 250, the fourth substrate 2000, and the sixth lens 260 respectively have surfaces 271, 211, 221, 281, 231, 291, 241, 251, 2001, and 261 facing away from the image plane 299, which can be represented as object-side surfaces. The first substrate 270, the first lens 210, the second lens 220, the second substrate 280, the third lens 230, the third substrate 290, the fourth lens 240, the fifth lens 250, the fourth substrate 2000, and the sixth lens 260 further have a first plane 272, a first lens surface 212, a surface 222, a surface 282, a surface 232, a fourth plane 292, a fourth lens surface 242, a surface 252, a sixth plane 2002, and a sixth lens surface 262 facing the image plane 299, which can be represented as image-side surfaces.

[0026] In this embodiment, the first substrate 270 may be a glass substrate, but this disclosure is not limited thereto. The first lens 210 may be a plano-concave lens. The first lens 210 is bonded to the first plane 272, that is, the surface 211 of the first lens 210 and the first plane 272 of the first substrate 270 are coplanar. In addition, the first lens 210 has a first lens surface 212 with a paraxial concave surface facing the image plane 299.

[0027] In this embodiment, the second substrate 280 may be a glass substrate, but this disclosure is not limited thereto. The second lens 220 may be a plano-convex lens. The second lens 220 is bonded to the second plane 281, that is, the surface 222 of the second lens 220 and the second plane 281 of the second substrate 280 are coplanar. In addition, the second lens 220 has a second lens surface 221 with a paraxial convex surface facing away from the image plane 299.

[0028] In this embodiment, the third substrate 290 may be a glass substrate, but this disclosure is not limited thereto. The third lens 230 is a positive lens and may be a plano-convex lens. The third lens 230 is bonded to the third plane 291, that is, the surface 232 of the third lens 230 and the third plane 291 of the third substrate 290 are coplanar. In addition, the third lens 230 has a third lens surface 231 with a paraxial convex surface facing away from the image plane 299.

[0029] In this embodiment, the fourth lens 240 may be a plano-convex lens. The fourth lens 240 is coupled to the fourth plane 292, that is, the surface 241 of the fourth lens 240 and the fourth plane 292 of the third substrate 290 are coplanar. In addition, the fourth lens 240 has a fourth lens surface 242 with a paraxial convex surface facing the image plane 299.

[0030] In this embodiment, the fourth substrate 2000 may be a glass substrate, but this disclosure is not limited thereto. The fifth lens 250 may be a plano-concave lens. The fifth lens 250 is bonded to the fifth plane 2001, that is, the surface 252 of the fifth lens 250 and the fifth plane 2001 of the fourth substrate 2000 are coplanar. In addition, the fifth lens 250 has a fifth lens surface 251 with a paraxial concave surface facing away from the image plane 299.

[0031] In this embodiment, the sixth lens 260 is a negative lens and may be a plano-concave lens. The sixth lens 260 is bonded to the sixth plane 2002, that is, the surface 261 of the sixth lens 260 and the sixth plane 2002 of the fourth substrate 2000 are coplanar. In addition, the sixth lens 260 has a sixth lens surface 262 with a paraxial concave surface facing the image plane 299.

[0032] Table 1

[0033]

[0034] Table 1 illustrates other detailed optical data of the first embodiment. The compound lens 200 according to the first embodiment has an F-number (Fno) of 5.5, a field of view (FOV) of 129 degrees, and an effective focal length (EFL) of 0.76 mm.

[0035] Table 2

[0036]

[0037] Table 2 illustrates the aspherical parameters of the compound lens 200 according to the disclosed first embodiment. The quantities in Table 2 are expressed in millimeters. In this embodiment, the first lens surface 212 of the first lens 210, the second lens surface 221 of the second lens 220, the third lens surface 231 of the third lens 230, the fourth lens surface 242 of the fourth lens 240, the fifth lens surface 251 of the fifth lens 250, and the sixth lens surface 262 of the sixth lens 260 are aspherical surfaces. These aspherical surfaces are defined by the following formula:

[0038]

[0039] in,

[0040] R: The radius of curvature of the lens surface close to the optical axis 201.

[0041] Z sag : A function of the radial coordinate r, where the z and r directions are parallel and perpendicular to the optical axis 201, respectively.

[0042] K: Conic constant, and

[0043] ai : The i-th order aspherical coefficient.

[0044] Furthermore, in this embodiment, the composite lens 200 also includes an aperture stop ST, a filter 2010, and a cover glass 2020 arranged sequentially along the optical axis 201. The aperture stop ST is disposed between the second substrate 280 and the third lens 230. The filter 2010 is disposed between the sixth lens 260 and the cover glass 2020. Furthermore, the filter 2010 and the cover glass 2020 each have surfaces 2011 and 2021 facing away from the image plane 299, which can be represented as object-side surfaces. The filter 2010 and the cover glass 2020 further have surfaces 2012 and 2022 facing the image plane 299, which can be represented as image-side surfaces. The filter 2010 may be an infrared cutoff filter, but this disclosure is not limited thereto.

[0045] Furthermore, in this embodiment, the Abbe numbers of the first lens 210, the third lens 230, and the fourth lens 240 are greater than the Abbe numbers of the second lens 220, the fifth lens 250, and the sixth lens 260.

[0046] Figure 2B for Figure 2A A schematic diagram illustrating the definition of the diagonal diameter of the image plane. (Refer to...) Figure 2A and Figure 2B In this embodiment, the compound lens 200 satisfies the following conditional expression: TTL / IH < 4, where TTL is the total track length from the surface 271 of the first substrate 270 to the image plane 299, and IH is the half-diagonal diameter (or image height) of the image plane 299, where the image plane 299 can be represented as the sensing surface of the sensor of the camera 180. Therefore, since the compound lens 200 disclosed herein satisfies the conditional expression TTL / IH < 4, the overall length of the compound lens 200 can be limited, and a compact camera 180 can be obtained.

[0047] Furthermore, in this embodiment, the compound lens 200 satisfies the following conditional expression: 1 < R2 / R1 < 8, where R1 is the radius of the first lens surface 212 of the first lens 210 facing the image plane 299, and R2 is the radius of the second lens surface 221 of the second lens 220 facing away from the image plane 299. Therefore, the above conditional expression is used to ensure the diopter ratio of the second lens 220 and the first lens 210, so that the compound lens 200 can have a wide FOV and a compact system.

[0048] Furthermore, in this embodiment, the compound lens 200 satisfies the following conditional expression: 1 < R5 / R4 < 10, where R4 is the radius of the fourth lens surface 242 of the fourth lens 240 facing the image plane 299, and R5 is the radius of the fifth lens surface 251 of the fifth lens 250 facing away from the image plane 299. Therefore, the above conditional expression is used to ensure the diopter ratio of the fourth lens 240 and the fifth lens 250, so that the compound lens 200 can have a small principal ray angle in the corner field of view.

[0049] Figures 3A to 3D According to Figure 2A A graph showing the longitudinal spherical aberration and various aberrations of the compound lens in the first embodiment. (Refer to...) Figures 3A to 3D , Figure 3A The longitudinal spherical aberration of the first embodiment is shown when the wavelengths are 420 nm, 475 nm, 520 nm, 570 nm, 600 nm and 640 nm. Figure 3B and Figure 3C The astigmatism in the sagittal direction and the astigmatism in the tangential direction on the image plane 299 are shown respectively when the wavelengths are 420 nm, 475 nm, 520 nm, 570 nm, 600 nm and 640 nm, according to the first embodiment. Figure 3D The distortion aberrations on image plane 299 according to the first embodiment are shown when the wavelengths are 420 nm, 475 nm, 520 nm, 570 nm, 600 nm and 640 nm (the six curves overlap each other).

[0050] The longitudinal spherical aberration of the first embodiment is as follows: Figure 3A As shown, the curves formed by each wavelength are very close to each other and tend towards the center, indicating that off-axis rays of each wavelength at different heights are concentrated near the imaging point. Therefore, this embodiment does indeed significantly improve spherical aberration at the same wavelength. Furthermore, the distances between the six representative wavelengths are also quite close to each other, indicating that the imaging positions of different wavelengths are quite concentrated, thus significantly improving chromatic aberration. Figure 3B and Figure 3C In the two image scattering aberration charts, the focal length variation of the six representative wavelengths across the entire image plane is very small. This demonstrates that the optical system according to the first embodiment can effectively eliminate aberrations. Figure 3D The distortion aberration diagram illustrates that the distortion aberration of the first embodiment is maintained within a small range, indicating that the distortion aberration of the first embodiment meets the imaging quality requirements of the optical system.

[0051] Figure 3E According to Figure 2A A graph showing the lateral chromatic aberration of the composite lens in the first embodiment. Figure 3F According to Figure 2A A graph showing the focal shift of the compound lens in the first embodiment with respect to different wavelengths. (Refer to...) Figure 3E , Figure 3E The image shows the location of the Irwin disk, and the maximum image height is 1.1090 mm. Figure 3E The lateral color difference in the first embodiment is maintained within a small range. (Refer to...) Figure 3F , Figure 3F The focal offset of the compound lens 200 is also kept within a small range. Therefore, this embodiment can provide higher sensor resolution and ultra-wide FOV while maintaining good optical performance.

[0052] Based on the above, the composite lens 200 in this embodiment includes a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, and a sixth lens 260. The refractive power of the lenses is designed such that the first lens 210 and the fifth lens 250 are negative lenses, and the second lens 220 and the fourth lens 240 are positive lenses. The additional fifth lens 250 and sixth lens 260 in the composite lens 200 improve the ability to reduce lateral ray aberration (the difference in distance between the real ray and the ideal image point on the image plane) and axial chromatic aberration. Therefore, the composite lens 200 in this embodiment can provide good image quality, higher sensor resolution (e.g., a camera with a 1500 pixel × 1500 pixel resolution), and ultra-wide FOV (e.g., FOV > 130 degrees). In addition to the elimination of aberrations, the composite lens 200 can also be used for a wide range of wavelengths (e.g., from visible light to near-infrared (850 nm)).

[0053] Figure 4 This is a schematic cross-sectional view of a compound lens. Figure 1 A second embodiment of the compound lens. See also... Figure 4The second embodiment of the compound lens 300 disclosed herein is generally similar to the first embodiment, except for the optical data and aspherical coefficients. Specifically, the compound lens 300 in this embodiment includes six lenses coaxially aligned along the optical axis 301: (i) a first substrate 370 and a first lens 310, and, in order of increasing distance from them and on the same side, (ii) a second lens 320, a second substrate 380, a third lens 330, a third substrate 390, a fourth lens 340, a fifth lens 350, a fourth substrate 3000, and a sixth lens 360. The first substrate 370, the first lens 310, the second lens 320, the second substrate 380, the third lens 330, the third substrate 390, the fourth lens 340, the fifth lens 350, the fourth substrate 3000, and the sixth lens 360 each have a surface 371, a surface 311, a second lens surface 321, a second plane 381, a third lens surface 331, a third plane 391, a surface 341, a fifth lens surface 351, a fifth plane 3001, and a surface 361 facing away from the image plane 399, which can be represented as object-side surfaces. The first substrate 370, the first lens 310, the second lens 320, the second substrate 380, the third lens 330, the third substrate 390, the fourth lens 340, the fifth lens 350, the fourth substrate 3000, and the sixth lens 360 further have a first plane 372, a first lens surface 312, a surface 322, a surface 382, ​​a surface 332, a surface 392, a fourth lens surface 342, a surface 352, a sixth plane 3002, and a sixth lens surface 362 facing the image plane 399, which can be represented as image-side surfaces.

[0054] Furthermore, in this embodiment, the third lens 330 is a negative lens. The third lens 330 is coupled to the third plane 391 and has a third lens surface 331 with a paraxial concave surface facing away from the image plane 399.

[0055] Table 3

[0056]

[0057] Detailed optical data of the compound lens 300 according to the second embodiment are shown in Table 3. The compound lens 300 according to the second embodiment has an F-number of 5.5, an FOV of 140 degrees, and an effective focal length of 0.8 mm.

[0058] Table 4

[0059]

[0060] According to the second embodiment, the aspherical coefficients of the first lens surface 312 of the first lens 310, the second lens surface 321 of the second lens 320, the third lens surface 331 of the third lens 330, the fourth lens surface 342 of the fourth lens 340, the fifth lens surface 351 of the fifth lens 350 and the sixth lens surface 362 of the sixth lens 360 in formula (1) are shown in Table 4.

[0061] Furthermore, in this embodiment, the Abbe numbers of the first lens 310, the fourth lens 340, and the sixth lens 360 are greater than the Abbe numbers of the third lens 330 and the fifth lens 350, and this disclosure does not limit the Abbe number of the second lens 320.

[0062] Similarly, the composite lens 300 in this embodiment also includes an aperture stop ST, a filter 3010, and a cover glass 3020 arranged sequentially along the optical axis 301. The aperture stop ST is disposed between the second substrate 380 and the third lens 330. The filter 3010 is disposed between the sixth lens 360 and the cover glass 3020. Furthermore, the filter 3010 and the cover glass 3020 respectively have surfaces 3011 and 3021 facing away from the image plane 399, which can be represented as object-side surfaces. The filter 3010 and the cover glass 3020 further have surfaces 3012 and 3022 facing the image plane 399, which can be represented as image-side surfaces. The filter 3010 may be an infrared cutoff filter, but this disclosure is not limited thereto.

[0063] Furthermore, in this embodiment, the composite lens 300 satisfies the following conditional expression: V6-V5 > 20, where V5 is the Abbe number of the fifth lens 350 and V6 is the Abbe number of the sixth lens 360. Therefore, since the composite lens 300 disclosed herein satisfies the conditional expression V6-V5 > 20, the axial chromatic aberration of the composite lens 300 is corrected.

[0064] Figures 5A to 5D According to Figure 4 A graph showing the longitudinal spherical aberration and various aberrations of the compound lens in the second embodiment. Figure 5E According to Figure 4 A graph showing the lateral chromatic aberration of the composite lens in the second embodiment. Figure 5F According to Figure 4 A graph showing the focal offset of the compound lens in the second embodiment with respect to different wavelengths. (Refer to...) Figures 5A to 5F In this embodiment, it can be obtained from Figures 5A to 5F It can be seen that longitudinal spherical aberration, astigmatism, distortion aberration, lateral chromatic aberration, and focus shift are all maintained within a small range. Therefore, the compound lens 300 in this embodiment can also provide good image quality.

[0065] Furthermore, since the sixth lens 360 of the compound lens 300 is designed to satisfy the following condition expression: V6-V5 > 20, the longitudinal chromatic aberration of the compound lens 300 in the second embodiment is lower than that in the first embodiment. Figure 5A ) and focus offset ( Figure 5F Smaller and better. Other advantages of the compound lens 300 are... Figure 2A The compound lens 200 is the same and will not be described again.

[0066] Figure 6 This is a schematic cross-sectional view of a compound lens. Figure 1 The third embodiment of the compound lens. See also... Figure 6 The third embodiment of the compound lens 400 disclosed herein is generally similar to the first embodiment, except for the optical data and aspherical coefficients. Specifically, the compound lens 400 in this embodiment includes six lenses coaxially aligned along the optical axis 401: (i) a first substrate 470 and a first lens 410, and, in order of increasing distance from them and on the same side, (ii) a second lens 420, a second substrate 480, a third lens 430, a third substrate 490, a fourth lens 440, a fifth lens 450, a fourth substrate 4000, and a sixth lens 460. The first substrate 470, the first lens 410, the second lens 420, the second substrate 480, the third lens 430, the third substrate 490, the fourth lens 440, the fifth lens 450, the fourth substrate 4000, and the sixth lens 460 each have a surface 471, a surface 411, a second lens surface 421, a second plane 481, a third lens surface 431, a third plane 491, a surface 441, a fifth lens surface 451, a fifth plane 4001, and a surface 461 facing away from the image plane 499, which can be represented as object-side surfaces. The first substrate 470, the first lens 410, the second lens 420, the second substrate 480, the third lens 430, the third substrate 490, the fourth lens 440, the fifth lens 450, the fourth substrate 4000, and the sixth lens 460 further have a first plane 472, a first lens surface 412, a surface 422, a surface 482, a surface 432, a surface 492, a fourth lens surface 442, a surface 452, a sixth plane 4002, and a sixth lens surface 462 facing the image plane 499, which can be represented as image-side surfaces.

[0067] Furthermore, in this embodiment, the third lens 430 is a negative lens, and the sixth lens 460 is a positive lens. The third lens 430 is bonded to the third plane 491 and has a third lens surface 431 with a paraxial concave surface facing away from the image plane 499. The sixth lens 460 is bonded to the sixth plane 4002 and has a sixth lens surface 462 with a paraxial convex surface facing the image plane 499.

[0068] Table 5

[0069]

[0070] Detailed optical data of the compound lens 400 according to the third embodiment are shown in Table 5. The compound lens 400 according to the second embodiment has an F-number of 5.5, an FOV of 140 degrees, and an effective focal length of 0.75 mm.

[0071] Table 6

[0072]

[0073] According to the third embodiment, the aspherical coefficients of the first lens surface 412 of the first lens 410, the second lens surface 421 of the second lens 420, the third lens surface 431 of the third lens 430, the fourth lens surface 442 of the fourth lens 440, the fifth lens surface 451 of the fifth lens 450 and the sixth lens surface 462 of the sixth lens 460 in formula (1) are shown in Table 6.

[0074] Furthermore, in this embodiment, the Abbe numbers of the first lens 410, the fourth lens 440, and the sixth lens 460 are greater than the Abbe numbers of the third lens 430 and the fifth lens 450, and this disclosure does not limit the Abbe number of the second lens 420.

[0075] Similarly, the composite lens 400 in this embodiment also includes an aperture stop ST, a filter 4010, and a cover glass 4020 arranged sequentially along the optical axis 401. The aperture stop ST is disposed between the second substrate 480 and the third lens 430. The filter 4010 is disposed between the sixth lens 460 and the cover glass 4020. Furthermore, the filter 4010 and the cover glass 4020 respectively have surfaces 4011 and 4021 facing away from the image plane 499, which can be represented as object-side surfaces. The filter 4010 and the cover glass 4020 further have surfaces 4012 and 4022 facing the image plane 499, which can be represented as image-side surfaces. The filter 4010 may be an infrared cutoff filter, but this disclosure is not limited thereto.

[0076] Furthermore, in this embodiment, the composite lens 400 satisfies the following conditional expression: V6-V5 > 20, where V5 is the Abbe number of the fifth lens 450 and V6 is the Abbe number of the sixth lens 460. Therefore, since the composite lens 400 disclosed herein satisfies the conditional expression V6-V5 > 20, the axial chromatic aberration of the composite lens 400 is corrected.

[0077] Figures 7A to 7D According to Figure 6 A graph showing the longitudinal spherical aberration and various aberrations of the compound lens in the third embodiment. Figure 7E According to Figure 6 A graph showing the lateral chromatic aberration of the composite lens in the third embodiment. Figure 7F According to Figure 6 A graph showing the focal offset of the compound lens in the third embodiment with respect to different wavelengths. (Refer to...) Figures 7A to 7F In this embodiment, it can be obtained from Figures 7A to 7F It can be seen that longitudinal spherical aberration, astigmatism, distortion aberration, lateral chromatic aberration, and focal shift are all maintained within a small range. Therefore, the compound lens 400 in this embodiment can also provide good image quality.

[0078] Furthermore, since the sixth lens 460 of the compound lens 400 is designed to satisfy the following condition expression: V6-V5 > 20, the longitudinal chromatic aberration of the compound lens 400 in the third embodiment is lower than that in the first embodiment. Figure 7A ) and focus offset ( Figure 7F Smaller and better. Other advantages of the compound lens 400 are... Figure 2A The compound lens 200 is the same and will not be described again.

[0079] In summary, the composite lens in this embodiment includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Furthermore, the first and fifth lenses are negative lenses, while the second and fourth lenses are positive lenses. Therefore, the additional fifth and sixth lenses in the composite lens improve the ability to reduce lateral ray aberration and axial chromatic aberration. Consequently, the composite lens in this embodiment can provide good image quality, higher sensor resolution, and an ultra-wide field of view (FOV).

[0080] Those skilled in the art will readily recognize that various modifications and variations can be made to the disclosed embodiments without departing from the scope or spirit of this disclosure. In view of the foregoing, this disclosure is intended to cover modifications and variations that fall within the scope of the following claims and their equivalents.

Claims

1. A composite lens, characterized in that, include: Six coaxially aligned lenses, including (i) a first substrate and a first lens, and, in order of increasing distance from them and on the same side, (ii) a second lens, a second substrate, a third lens, a third substrate, a fourth lens, a fifth lens, a fourth substrate and a sixth lens. Wherein the first lens and the fifth lens are negative lenses; and The second lens and the fourth lens are positive lenses.

2. The composite lens according to claim 1, characterized in that, The third lens is a positive lens, and the sixth lens is a negative lens.

3. The composite lens according to claim 1, characterized in that, The Abbe numbers of the first lens, the third lens, and the fourth lens are greater than the Abbe numbers of the second lens, the fifth lens, and the sixth lens.

4. The composite lens according to claim 1, characterized in that, The third lens and the sixth lens are negative lenses.

5. The composite lens according to claim 1, characterized in that, The third lens is a negative lens and the sixth lens is a positive lens.

6. The composite lens according to claim 1, characterized in that, The Abbe numbers of the first lens, the fourth lens, and the sixth lens are greater than the Abbe numbers of the third lens and the fifth lens.

7. The composite lens according to claim 1, characterized in that, The first substrate has a first plane facing the image plane, and the first lens is coupled to the first plane and has a first lens surface with a paraxial concave surface facing the image plane.

8. The composite lens according to claim 1, characterized in that, The second substrate has a second plane facing away from the image plane, and the second lens is joined to the second plane and has a second lens surface with a paraxial convex surface facing away from the image plane.

9. The composite lens according to claim 1, characterized in that, The third substrate has a third plane facing away from the image plane, and the third lens is bonded to the third plane and has a third lens surface with a paraxial convex surface facing away from the image plane.

10. The composite lens according to claim 1, characterized in that, The third substrate has a third plane facing away from the image plane, and the third lens is bonded to the third plane and has a third lens surface with a paraxial concave surface facing away from the image plane.

11. The composite lens according to claim 1, characterized in that, The third substrate has a fourth plane facing the image plane, and the fourth lens is coupled to the fourth plane and has a fourth lens surface with a paraxial convex surface facing the image plane.

12. The composite lens according to claim 1, characterized in that, The fourth substrate has a fifth plane facing away from the image plane, and the fifth lens is bonded to the fifth plane and has a fifth lens surface with a paraxial concave surface facing away from the image plane.

13. The composite lens according to claim 1, characterized in that, The fourth substrate has a sixth plane facing the image plane, and the sixth lens is coupled to the sixth plane and has a sixth lens surface with a paraxial concave surface facing the image plane.

14. The composite lens according to claim 1, characterized in that, The fourth substrate has a sixth plane facing the image plane, and the sixth lens is coupled to the sixth plane and has a sixth lens surface with a paraxial convex surface facing the image plane.

15. The composite lens according to claim 1, characterized in that, The composite lens satisfies the following condition: 1 < R2 / R1 < 8, where R1 is the radius of the first lens surface facing the image plane, and R2 is the radius of the second lens surface facing away from the image plane.

16. The composite lens according to claim 1, characterized in that, The composite lens satisfies the following condition: 1 < R5 / R4 < 10, where R4 is the radius of the fourth lens surface facing the image plane, and R5 is the radius of the fifth lens surface facing away from the image plane.

17. The composite lens according to claim 1, characterized in that, The composite lens satisfies the following condition: TTL / IH < 4, where TTL is the total track length from the surface of the first substrate facing away from the image plane to the image plane, and IH is the half-diagonal diameter of the image plane.

18. The composite lens according to claim 1, characterized in that, The composite lens satisfies the following conditional expression: V6-V5 > 20, where V5 is the Abbe number of the fifth lens and V6 is the Abbe number of the sixth lens.

Images