Wide-angle lens

Abstract

A wide-angle lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens. The first lens has negative refractive power, is a meniscus lens, and comprises a convex surface facing the object side and a concave surface facing the image side. The second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens have refractive power. The ninth lens has positive refractive power and comprises a convex surface facing the image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are sequentially arranged from the object side to the image side along the optical axis.

Description

Technical Field

[0001] The invention relates to a wide-angle lens. Background Art

[0002] The current development trend of wide-angle lenses is not only to develop towards a larger field of view, but also to have miniaturization and resistance to ambient temperature changes in response to different application requirements. The existing wide-angle lenses can no longer meet today's needs, and another new wide-angle lens structure is needed to simultaneously meet the requirements of a large field of view, miniaturization, and resistance to ambient temperature changes. Summary of the invention

[0003] In view of this, the main purpose of the present invention is to provide a wide-angle lens with a large field of view but still good optical performance.

[0004] The present invention provides a wide-angle lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens. The first lens has a negative refractive power, is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side. The second lens has refractive power. The third lens has refractive power. The fourth lens has refractive power. The fifth lens has refractive power. The sixth lens has refractive power. The seventh lens has refractive power. The eighth lens has refractive power. The ninth lens has a positive refractive power, and the ninth lens includes a convex surface facing the image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are arranged in sequence from the object side to the image side along the optical axis. The wide-angle lens satisfies at least one of the following conditions: -3≤f1 / f≤-1; 19 degrees / mm≤(HFOV 0.77 -HFOV 0.1 ) / (IH 0.77 -IH 0.1 )≤22 degrees / mm; 0.91≤f / BFL≤0.99; 10.12≤TTL / T67≤29.28; 24.48≤(R11+R12) / CT1≤26.54; 2.67≤(R81+R82) / CT8≤14.37; where f is the effective focal length of the wide-angle lens, f1 is the effective focal length of the first lens, HFOV 0.77 The half field of view at 0.77 image height, HFOV 0.1 IH is the half field of view at 0.1 image height. 0.77 IH is the height of the electronic photosensitive component at 0.77 image height. 0.1is the height of the electronic photosensitive component at 0.1 image height, TTL is the distance between the object side of the first lens and the imaging surface on the optical axis, BFL is the distance between the image side of the ninth lens and the imaging surface on the optical axis, T67 is the distance between the image side of the sixth lens and the object side of the seventh lens on the optical axis, R11 is the radius of curvature of the object side of the first lens, R12 is the radius of curvature of the image side of the first lens, CT1 is the distance between the object side of the first lens and the image side of the first lens on the optical axis, R81 is the radius of curvature of the object side of the eighth lens, R82 is the radius of curvature of the image side of the eighth lens, and CT8 is the distance between the object side of the eighth lens and the image side of the eighth lens on the optical axis. When the wide-angle lens of the present invention meets the above characteristics and at least one of the conditions therein and does not require other additional conditional formulas or characteristics, the basic function of the wide-angle lens of the present invention can be achieved.

[0005] The second lens has negative refractive power, the fifth lens has positive refractive power, the sixth lens has positive refractive power, the seventh lens has positive refractive power, the eighth lens has negative refractive power, and the refractive power of the third lens is opposite to that of the fourth lens.

[0006] The fifth lens includes a convex surface facing the object side, the sixth lens includes a convex surface facing the image side, the seventh lens includes a convex surface facing the object side and another convex surface facing the image side, the eighth lens includes a concave surface facing the object side and another concave surface facing the image side, the ninth lens further includes another convex surface facing the object side, and the seventh lens and the eighth lens are cemented together.

[0007] The wide-angle lens of the present invention may further include a tenth lens disposed between the sixth lens and the seventh lens, the tenth lens has positive refractive power, the third lens has negative refractive power, and the fourth lens has positive refractive power.

[0008] The second lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side. The third lens includes a concave surface facing the object side. The fourth lens includes a convex surface facing the object side. The tenth lens includes a convex surface facing the object side and another convex surface facing the image side.

[0009] The third lens is a meniscus lens and further includes a convex surface facing the image side, the fourth lens is a meniscus lens and further includes a concave surface facing the image side, the fifth lens further includes another convex surface facing the image side, and the sixth lens is a meniscus lens and further includes a concave surface facing the object side.

[0010] The third lens further includes another concave surface facing the image side, the fourth lens further includes another convex surface facing the image side, the fifth lens is a meniscus lens and further includes a concave surface facing the image side, the sixth lens further includes another convex surface facing the object side, and the third lens and the fourth lens are cemented together.

[0011] The third lens has positive refractive power, and the fourth lens has negative refractive power.

[0012] The third lens includes a convex surface facing the object side and another convex surface facing the image side, the fourth lens includes a concave surface facing the object side and another concave surface facing the image side, the fifth lens further includes another convex surface facing the image side, and the sixth lens further includes another convex surface facing the object side.

[0013] The wide-angle lens of the present invention may further include an aperture arranged between the fifth lens and the seventh lens, and the wide-angle lens satisfies at least one of the following conditions: 0.4≤T11ST / TTL≤0.6; 0.2≤Nd8-Nd7≤0.5; 5≤(fSF1+fSR1) / f≤22; wherein T11ST is the distance between the object side surface of the first lens and the aperture surface on the optical axis, TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, Nd7 is the refractive index of the seventh lens, Nd8 is the refractive index of the eighth lens, fSF1 is the effective focal length of the lens closest to the object side of the aperture, and fSR1 is the effective focal length of the lens closest to the image side of the aperture.

[0014] The wide-angle lens of the present invention has a large field of view, a short total lens length, and is resistant to environmental temperature changes, while still having good optical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the above-mentioned objects, features, and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings.

[0016] Figure 1 Schematic diagram of lens configuration according to a first embodiment of the wide-angle lens of the present invention.

[0017] Figure 2 , 3 4 are respectively a field curvature diagram, a distortion diagram, and a lateral chromatic aberration diagram of the first embodiment of the wide-angle lens according to the present invention.

[0018] Figure 5 FIG. 4 is a schematic diagram of lens configuration according to a second embodiment of the wide-angle lens of the present invention.

[0019] Figure 6 , 7 8 are respectively a field curvature diagram, a distortion diagram, and a lateral chromatic aberration diagram of the second embodiment of the wide-angle lens according to the present invention.

[0020] Fig. 9FIG. 4 is a schematic diagram of lens configuration of a third embodiment of a wide-angle lens according to the present invention.

[0021] Fig.10 , 11 1 and 12 are respectively a field curvature diagram, a distortion diagram, and a lateral chromatic aberration diagram of the third embodiment of the wide-angle lens according to the present invention. DETAILED DESCRIPTION

[0022] The present invention provides a wide-angle lens, comprising: a first lens having negative refractive power, the first lens being a meniscus lens and comprising a convex surface facing the object side and a concave surface facing the image side; a second lens having refractive power; a third lens having refractive power; a fourth lens having refractive power; a fifth lens having refractive power; a sixth lens having refractive power; a seventh lens having refractive power; an eighth lens having refractive power; and a ninth lens having positive refractive power, the ninth lens comprising a convex surface facing the image side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are arranged in sequence from the object side to the image side along an optical axis; wherein the wide-angle lens satisfies at least one of the following conditions: -3≤f1 / f≤-1; 19 degrees / mm≤(HFOV 0.77 -HFOV 0.1 ) / (IH 0.77 -IH 0.1 )≤22 degrees / mm; 0.91≤f / BFL≤0.99; 10.12≤TTL / T67≤29.28; 24.48≤(R11+R12) / CT1≤26.54; 2.67≤(R81+R82) / CT8≤14.37; where f is the effective focal length of the wide-angle lens, f1 is the effective focal length of the first lens, HFOV 0.77 The half field of view at 0.77 image height, HFOV 0.1 IH is the half field of view at 0.1 image height. 0.77 IH is the height of the electronic photosensitive component at 0.77 image height. 0.1is the height of the electronic photosensitive component at 0.1 image height, TTL is the distance between the object side of the first lens and the imaging surface on the optical axis, BFL is the distance between the image side of the ninth lens and the imaging surface on the optical axis, T67 is the distance between the image side of the sixth lens and the object side of the seventh lens on the optical axis, R11 is the radius of curvature of the object side of the first lens, R12 is the radius of curvature of the image side of the first lens, CT1 is the distance between the object side of the first lens and the image side of the first lens on the optical axis, R81 is the radius of curvature of the object side of the eighth lens, R82 is the radius of curvature of the image side of the eighth lens, and CT8 is the distance between the object side of the eighth lens and the image side of the eighth lens on the optical axis. When the wide-angle lens of the present invention meets the above characteristics and at least one of the conditions, it is a preferred embodiment of the present invention.

[0023] Please refer to Table 1, Table 2, Table 4, Table 5, Table 7 and Table 8 below, wherein Table 1, Table 4 and Table 7 are the relevant parameter tables of each lens of the first embodiment to the third embodiment of the wide-angle lens according to the present invention, and Table 2, Table 5 and Table 8 are the relevant parameter tables of the aspheric surface of the aspheric lens in Table 1, Table 4 and Table 7. In the following embodiments, the concavity z of the aspheric surface of the aspheric lens is obtained by the following formula: z=ch 2 / {1+[1-(k+1)c 2 h 2 ] 1 / 2}+Ah 4 +Bh 6 +Ch 8 , where c is the curvature, h is the vertical distance from any point on the lens surface to the optical axis, k is the conic constant, A~C are the aspheric coefficients, and the aspheric coefficients are expressed in scientific notation, for example, 2E-03 means 2×10 -3 .

[0024] Figure 1 , 5 9 are schematic diagrams of lens configurations of the first, second and third embodiments of the wide-angle lens of the present invention, respectively. The first lenses L11, L21 and L31 are meniscus lenses with negative refractive power, made of glass, with object-side surfaces S11, S21 and S31 being convex, and image-side surfaces S12, S22 and S32 being concave, and both object-side surfaces S11, S21 and S31 and image-side surfaces S12, S22 and S32 being spherical surfaces.

[0025] The second lenses L12, L22, and L32 have negative refractive power and are made of glass. The image-side surfaces S14, S24, and S34 thereof are concave surfaces, and the object-side surfaces S13, S23, and S33 and the image-side surfaces S14, S24, and S34 are spherical surfaces.

[0026] The third lenses L13, L23 and L33 have positive refractive power and are made of glass.

[0027] The fourth lenses L14, L24 and L34 have positive refractive power.

[0028] The fifth lens L15, L25, L35 has positive refractive power, and the object-side surfaces S19, S28, S39 thereof are convex surfaces, and the object-side surfaces S19, S28, S39 and the image-side surfaces S110, S29, S310 are aspherical surfaces.

[0029] The sixth lens L16, L26, L36 has positive refractive power, is made of glass, and has convex image-side surfaces S112, S211, S313.

[0030] The seventh lens L17, L27, L37 is a double convex lens with positive refractive power, and is made of glass. Its object-side surfaces S116, S215, S314 are convex, and its image-side surfaces S117, S216, S315 are convex. The object-side surfaces S116, S215, S314 and the image-side surfaces S117, S216, S315 are all spherical surfaces.

[0031] The eighth lens L18, L28, L38 is a double concave lens with negative refractive power, and is made of glass. The object-side surfaces S117, S216, S315 are concave surfaces, and the image-side surfaces S118, S217, S316 are concave surfaces. The object-side surfaces S117, S216, S315 and the image-side surfaces S118, S217, S316 are all spherical surfaces.

[0032] The seventh lens L17, L27, L37 and the eighth lens L18, L28, L38 are cemented together.

[0033] The ninth lens L19, L29, L39 is a biconvex lens with positive refractive power, whose object-side surfaces S119, S218, S317 are convex surfaces, and image-side surfaces S120, S219, S318 are convex surfaces, and both the object-side surfaces S119, S218, S317 and the image-side surfaces S120, S219, S318 are aspherical surfaces.

[0034] In addition, the wide-angle lenses 1, 2, and 3 satisfy at least one of the following conditions (1) to (9):

[0035] -3 ≤ f1 / f ≤ -1; (1)

[0036] 19 degrees / mm ≤ (HFOV 0.77 -HFOV 0.1 ) / (IH 0.77 -IH 0.1 ) ≤ 22 degrees / mm; (2)

[0037] 0.4 ≤ T11ST / TTL ≤ 0.6; (3)

[0038] 0.2 ≤ Nd8-Nd7 ≤ 0.5; (4)

[0039] 5 ≤ (fSF1+fSR1) / f ≤ 22; (5)

[0040] 0.91 ≤ f / BFL ≤ 0.99; (6)

[0041] 10.12 ≤ TTL / T67 ≤ 29.28; (7)

[0042] 24.48 ≤ (R11+R12) / CT1 ≤ 26.54; (8)

[0043] 2.67 ≤ (R81+R82) / CT8 ≤ 14.37; (9)

[0044] Wherein, f is the effective focal length of the wide-angle lenses 1, 2, and 3 in the first to third embodiments, f1 is the effective focal length of the first lens L11, L21, and L31 in the first to third embodiments, HFOV 0.77 In the first to third embodiments, the half field of view at 0.77 image height, HFOV 0.1 In the first to third embodiments, the half field of view at 0.1 image height, IH 0.77 is the height of the electronic photosensitive component at 0.77 image height in the first to third embodiments, IH 0.1is the height of the electronic photosensitive component at 0.1 image height in the first to third embodiments, TTL is the distance between the object side surfaces S11, S21, S31 of the first lens L11, L21, L31 and the imaging surfaces IMA1, IMA2, IMA3 on the optical axes OA1, OA2, OA3 in the first to third embodiments, BFL is the distance between the image side surfaces S120, S219, S318 of the ninth lens L19, L29, L39 and the imaging surfaces IMA1, IMA2, IMA3 on the optical axes OA1, OA2, OA3 in the first to third embodiments, R11 is the distance between the object side surfaces S11, S21, S31 of the first lens L11, L21, L31 and the imaging surfaces IMA1, IMA2, IMA3 on the optical axes OA1, OA2, OA3 in the first to third embodiments. R12 is the curvature radius of the image-side surface S12, S22, S32 of the first lens L11, L21, L31 in the first to third embodiments, R81 is the curvature radius of the object-side surface S117, S216, S315 of the eighth lens L18, L28, L38 in the first to third embodiments, R82 is the curvature radius of the image-side surface S118, S217, S316 of the eighth lens L18, L28, L38 in the first to third embodiments, and CT1 is the curvature radius of the object-side surface S11, S21, S31 of the first lens L11, L21, L31 to the image-side surface S12, S22, S32 of the first lens L11, L21, L31 in the first to third embodiments. , S117, S216, S315 of the eighth lens L18, L28, L38 and the image side surfaces S118, S217, S316 of the eighth lens L18, L28, L38 on the optical axes OA1, OA2, OA3 in the first to third embodiments; T11ST is the distance between the object side surfaces S11, S21, S31 of the first lens L11, L21, L31 and the aperture surfaces S113, S212, S311 on the optical axes OA1, OA2, OA3 in the first to third embodiments; T67 is the distance between the image side surfaces S112, S216, S315 of the eighth lens L18, L28, L38 and the image side surfaces S118, S217, S316 of the eighth lens L18, L28, L38 on the optical axes OA1, OA2, OA3 in the first to third embodiments; The distances from S211, S313 to the object-side surfaces S116, S215, S314 of the seventh lenses L17, L27, L37 on the optical axes OA1, OA2, OA3, Nd7 is the refractive index of the seventh lenses L17, L27, L37 in the first to third embodiments, Nd8 is the refractive index of the eighth lenses L18, L28, L38 in the first to third embodiments, fSF1 is the effective focal length of the lenses L16, L26, L35 closest to the object side of the apertures ST1, ST2, ST3 in the first to third embodiments, and fSR1 is the effective focal length of the lenses L110, L210, L36 closest to the image side of the apertures ST1, ST2, ST3 in the first to third embodiments.The wide-angle lenses 1, 2, and 3 can effectively shorten the total length of the lenses, effectively improve the field of view, effectively resist changes in ambient temperature, and effectively correct aberrations.

[0045] When the condition (1) is met: -3≤f1 / f≤-1, the field of view can be effectively improved. When the condition (2) is met: 19 degrees / mm≤(HFOV 0.77 -HFOV 0.1 ) / (IH 0.77 -IH 0.1 )≤22 degrees / mm, distortion can be effectively reduced. When condition (3) is met: 0.4≤T11ST / TTL≤0.6, the total height of the lens can be effectively reduced. When condition (4) is met: 0.2≤Nd8-Nd7≤0.5, chromatic aberration can be effectively reduced. When condition (5) is met: 5≤(fSF1+fSR1) / f≤22, it can effectively resist changes in ambient temperature. When condition (6) is met: 0.91≤f / BFL≤0.99, condition (7) is met: 10.12≤TTL / T67≤29.28, condition (8) is met: 24.48≤(R11+R12) / CT1≤26.54 or condition (9) is met: 2.67≤(R81+R82) / CT8≤14.37, the total height of the lens can be effectively reduced. When the conditions (1) are met: -3 ≤ f1 / f ≤ -1, and (2) are met: 19 degrees / mm ≤ (HFOV 0.77 -HFOV 0.1 ) / (IH 0.77 -IH 0.1 )≤22 degrees / mm, condition (6): 0.91≤f / BFL≤0.99, condition (7): 10.12≤TTL / T67≤29.28, condition (8): 24.48≤(R11+R12) / CT1≤26.54 and condition (9): 2.67≤(R81+R82) / CT8≤14.37, which can effectively increase the field of view and correct distortion, and shorten the overall height of the lens.

[0046] The first embodiment of the wide-angle lens of the present invention is now described in detail. Figure 1The wide-angle lens 1 includes, along the optical axis OA1, from the object side to the image side, a first lens L11, a second lens L12, a third lens L13, a fourth lens L14, a fifth lens L15, a sixth lens L16, an aperture ST1, a tenth lens L110, a seventh lens L17, an eighth lens L18, a ninth lens L19, a protective glass CG1, and an electronic photosensitive component (not shown). The effective focal length of the combination of the seventh lens L17 and the eighth lens L18 is equal to -9.7887 mm. When imaging, the light from the object side is finally imaged on the imaging surface IMA1, and the imaging surface IMA1 coincides with the sensing surface of the electronic photosensitive component (not shown). According to the first to twelfth paragraphs of [Specific Implementation], the second lens L12 is a meniscus lens, and its object side surface S13 is a convex surface; the third lens L13 is a meniscus lens with negative refractive power, its object side surface S15 is a concave surface, and the image side surface S16 is a convex surface, and both the object side surface S15 and the image side surface S16 are spherical surfaces; the fourth lens L14 is a meniscus lens with positive refractive power, made of glass material, its object side surface S17 is a convex surface, and the image side surface S18 is a concave surface, and both the object side surface S17 and the image side surface S18 are spherical surfaces; the fifth lens L15 is a biconvex lens, made of glass material, and its image side surface S110 is a convex surface; the sixth lens L16 is a meniscus lens, and its object side surface S110 is a convex surface. 111 is a concave surface, and the object side surface S111 and the image side surface S112 are both spherical surfaces; the tenth lens L110 is a double convex lens with positive refractive power, made of glass material, and its object side surface S114 is a convex surface, and the image side surface S115 is a convex surface, and both the object side surface S114 and the image side surface S115 are aspherical surfaces; the ninth lens L19 is made of glass material; the object side surface S121 and the image side surface S122 of the protective glass CG1 are both flat surfaces; by using the above-mentioned lens, aperture ST1 and the design that meets at least one of the conditions (1) to (9), the wide-angle lens 1 can effectively shorten the total length of the lens, effectively improve the field of view, effectively resist environmental temperature changes, and effectively correct aberrations. When the wide-angle lens of the present invention only meets the condition (1) and the refractive surface shape characteristics in the independent item, or only meets the condition (6) and the refractive surface shape characteristics in the independent item, the basic action requirements can be met.

[0047] Table 1 Figure 1 Table of relevant parameters of each lens of medium wide angle lens 1.

[0048] Table 1

[0049]

[0050]

[0051] Table 2 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 1.

[0052] Table 2

[0053]

[0054] Table 3 shows the relevant parameter values ​​of the wide-angle lens 1 of the first embodiment and the calculated values ​​corresponding to conditions (1) to (9). It can be seen from Table 3 that the wide-angle lens 1 of the first embodiment can meet the requirements of conditions (1) to (9).

[0055] Table 3

[0056]

[0057] In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirements. Figure 2 It can be seen that the field curvature of the wide-angle lens 1 of the first embodiment is between -0.04mm and 0.04mm. Figure 3 It can be seen that the distortion of the wide-angle lens 1 of the first embodiment is between -80% and 0%. Figure 4 It can be seen that the lateral chromatic aberration of the wide-angle lens 1 of the first embodiment is between -1 μm and 7 μm. It is obvious that the field curvature, distortion and lateral chromatic aberration of the wide-angle lens 1 of the first embodiment can be effectively corrected, thereby obtaining better optical performance.

[0058] The second embodiment of the wide-angle lens of the present invention is now described in detail. Figure 5The wide-angle lens 2 includes, along the optical axis OA2 from the object side to the image side, a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, a fifth lens L25, a sixth lens L26, an aperture ST2, a tenth lens L210, a seventh lens L27, an eighth lens L28, a ninth lens L29, a protective glass CG2, and an electronic photosensitive component (not shown). The effective focal length of the combination of the third lens L23 and the fourth lens L24 is equal to -540.2782 mm, and the effective focal length of the combination of the seventh lens L27 and the eighth lens L28 is equal to -8.2178 mm. When imaging, the light from the object side is finally imaged on the imaging surface IMA2, and the imaging surface IMA2 coincides with the sensing surface of the electronic photosensitive component (not shown). According to the first to twelfth paragraphs of [Specific Implementation], the second lens L22 is a meniscus lens, and its object side surface S23 is a convex surface; the third lens L23 is a biconcave lens with negative refractive power, its object side surface S25 is a concave surface, the image side surface S26 is a concave surface, and both the object side surface S25 and the image side surface S26 are spherical surfaces; the fourth lens L24 is a biconvex lens with positive refractive power, made of glass, its object side surface S26 is a convex surface, the image side surface S27 is a convex surface, and both the object side surface S26 and the image side surface S27 are spherical surfaces; the third lens L23 is cemented with the fourth lens L24; the fifth lens L25 is a meniscus lens, made of glass, and its image side surface S29 is a concave surface; the sixth lens L26 is a biconvex lens The lens has an object side S210 which is convex, and both the object side S210 and the image side S211 are spherical surfaces; the tenth lens L210 is a double convex lens with positive refractive power, made of glass material, and its object side S212 is convex, and the image side S213 is convex, and both the object side S212 and the image side S213 are aspherical surfaces; the ninth lens L29 is made of glass material; the object side S220 and the image side S221 of the protective glass CG2 are both planes; by using the above-mentioned lens, aperture ST2 and the design that meets at least one of the conditions (1) to (9), the wide-angle lens 2 can effectively shorten the total length of the lens, effectively improve the field of view, effectively resist the change of ambient temperature, and effectively correct aberrations. When the wide-angle lens of the present invention only meets the condition (2) and the refractive surface shape characteristics in the independent item, or only meets the condition (7) and the refractive surface shape characteristics in the independent item, the basic action requirements can be met.

[0059] Table 4 is Figure 5 Table of relevant parameters of each lens of medium wide angle lens 2.

[0060] Table 4

[0061]

[0062]

[0063] Table 5 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 4.

[0064] Table 5

[0065]

[0066] Table 6 shows the relevant parameter values ​​of the wide-angle lens 2 of the second embodiment and the calculated values ​​corresponding to conditions (1) to (9). It can be seen from Table 6 that the wide-angle lens 2 of the second embodiment can meet the requirements of conditions (1) to (9).

[0067] Table 6

[0068]

[0069] In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also meet the requirements. Figure 6 It can be seen that the field curvature of the wide-angle lens 2 of the second embodiment is between -0.04mm and 0.08mm. Figure 7 It can be seen that the distortion of the wide-angle lens 2 of the second embodiment is between -80% and 0%. Figure 8 It can be seen that the lateral chromatic aberration of the wide-angle lens 2 of the second embodiment is between -0.5 μm and 4 μm. It is obvious that the field curvature, distortion and lateral chromatic aberration of the wide-angle lens 2 of the second embodiment can be effectively corrected, thereby obtaining better optical performance.

[0070] The third embodiment of the wide-angle lens of the present invention is now described in detail. Fig. 9The wide-angle lens 3 includes, along the optical axis OA3 from the object side to the image side, a first lens L31, a second lens L32, a third lens L33, a fourth lens L34, a fifth lens L35, an aperture ST3, a sixth lens L36, a seventh lens L37, an eighth lens L38, a ninth lens L39, a protective glass CG3, and an electronic photosensitive component (not shown). The effective focal length of the combination of the seventh lens L37 and the eighth lens L38 is equal to -6.5828 mm. When imaging, the light from the object side is finally imaged on the imaging surface IMA3, and the imaging surface IMA3 coincides with the sensing surface of the electronic photosensitive component (not shown). According to the first to twelfth paragraphs of [Specific Implementation], the second lens L32 is a biconcave lens, and its object side surface S33 is a concave surface; the third lens L33 is a biconvex lens with positive refractive power, its object side surface S35 is a convex surface, and the image side surface S36 is a convex surface, and both the object side surface S35 and the image side surface S36 are aspherical surfaces; the fourth lens L34 is a biconcave lens with negative refractive power, made of plastic material, its object side surface S37 is a concave surface, and the image side surface S38 is a concave surface, and both the object side surface S37 and the image side surface S38 are aspherical surfaces; the fifth lens L35 is a biconvex lens, made of plastic material. The sixth lens L36 is a double convex lens, and its object side S312 is a convex surface, and both the object side S312 and the image side S313 are aspherical surfaces; the ninth lens L39 is made of plastic material; the object side S319 and the image side S320 of the protective glass CG3 are both planes; by using the above-mentioned lenses, aperture ST3 and the design that meets at least one of the conditions (1) to (9), the wide-angle lens 3 can effectively shorten the total length of the lens, effectively improve the field of view, effectively resist the change of ambient temperature, and effectively correct aberrations. When the wide-angle lens of the present invention only meets the condition (8) and the refractive surface shape characteristics in the independent item, or only meets the condition (9) and the refractive surface shape characteristics in the independent item, the basic action requirements can be met.

[0071] Table 7 Fig. 9 Table of relevant parameters of each lens of medium wide angle lens 3.

[0072] Table 7

[0073]

[0074]

[0075] Table 8 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 7.

[0076] Table 8

[0077]

[0078] Table 9 shows the relevant parameter values ​​of the wide-angle lens 3 of the third embodiment and the calculated values ​​corresponding to conditions (1) to (9). It can be seen from Table 9 that the wide-angle lens 3 of the third embodiment can meet the requirements of conditions (1) to (9).

[0079] Table 9

[0080]

[0081]

[0082] In addition, the optical performance of the wide-angle lens 3 of the third embodiment can also meet the requirements. Fig.10 It can be seen that the field curvature of the wide-angle lens 3 of the third embodiment is between -0.04mm and 0.06mm. Fig.11 It can be seen that the distortion of the wide-angle lens 3 of the third embodiment is between -80% and 0%. Fig.12 It can be seen that the lateral chromatic aberration of the wide-angle lens 3 of the third embodiment is between -0.5 μm and 4.5 μm. It is obvious that the field curvature, distortion and lateral chromatic aberration of the wide-angle lens 3 of the third embodiment can be effectively corrected, thereby obtaining better optical performance.

[0083] Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A wide-angle lens, characterized in that: include: The first lens has negative refractive power, and the first lens is a meniscus lens, and includes a convex surface facing the object side and a concave surface facing the image side; The second lens has a refractive power; The third lens has refractive power; The fourth lens has refractive power; The fifth lens has refractive power; The sixth lens has refractive power; The seventh lens has refractive power; The eighth lens has refractive power; as well as The ninth lens has positive refractive power, and the ninth lens includes a convex surface facing the image side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are arranged in sequence from the object side to the image side along the optical axis; The wide-angle lens satisfies at least one of the following conditions: -3≤f1 / f≤-1; 19 degrees / mm ≤ (HFOV 0.77 - HFOV 0.1 ) / (IH 0.77 - IH 0.1 ) ≤ 22 degrees / mm; 0.91≤f / BFL≤0.99; 10.12≤TTL / T67≤29.28; 24.48≤(R11+R12) / CT1≤26.54; 2.67≤(R81+R82) / CT8≤14.37; Wherein, f is the effective focal length of the wide-angle lens, f1 is the effective focal length of the first lens, HFOV 0.77 The half field of view at 0.77 image height, HFOV 0.1 IH is the half field of view at 0.1 image height. 0.77 IH is the height of the electronic photosensitive component at 0.77 image height. 0.1 is the height of the electronic photosensitive component at 0.1 image height, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, BFL is the distance from the image side surface of the ninth lens to the imaging surface on the optical axis, T67 is the distance from the image side surface of the sixth lens to the object side surface of the seventh lens on the optical axis, R11 is the curvature radius of the object side surface of the first lens, R12 is the curvature radius of the image side surface of the first lens, CT1 is the distance from the object side surface of the first lens to the image side surface of the first lens on the optical axis, R81 is the curvature radius of the object side surface of the eighth lens, R82 is the curvature radius of the image side surface of the eighth lens, and CT8 is the distance from the object side surface of the eighth lens to the image side surface of the eighth lens on the optical axis.

2. The wide-angle lens according to claim 1, characterized in that: The second lens has negative refractive power; The fifth lens has positive refractive power; The sixth lens has positive refractive power; The seventh lens has positive refractive power; The eighth lens has negative refractive power; and The refractive power of the third lens is opposite to the refractive power of the fourth lens.

3. The wide-angle lens according to claim 2, characterized in that: The fifth lens comprises a convex surface facing the object side; The sixth lens comprises a convex surface facing the image side; The seventh lens comprises a convex surface facing the object side and another convex surface facing the image side; The eighth lens comprises a concave surface facing the object side and another concave surface facing the image side; The ninth lens further includes another convex surface facing the object side; and The seventh lens and the eighth lens are cemented together.

4. The wide-angle lens according to claim 3, characterized in that: The third lens has negative refractive power, the fourth lens has positive refractive power, and further includes a tenth lens disposed between the sixth lens and the seventh lens, the tenth lens has positive refractive power.

5. The wide-angle lens according to claim 4, characterized in that: The second lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side; The third lens comprises a concave surface facing the object side; The fourth lens comprises a convex surface facing the object side; and The tenth lens includes a convex surface facing the object side and another convex surface facing the image side.

6. The wide-angle lens according to claim 4, characterized in that: The third lens is a meniscus lens and further includes a convex surface facing the image side; The fourth lens is a meniscus lens and further comprises a concave surface facing the image side; The fifth lens further includes another convex surface facing the image side; and The sixth lens is a meniscus lens and further includes a concave surface facing the object side.

7. The wide-angle lens according to claim 4, characterized in that: The third lens further includes another concave surface facing the image side; The fourth lens further includes another convex surface facing the image side; The fifth lens is a meniscus lens and further includes a concave surface facing the image side; The sixth lens further includes another convex surface facing the object side; and The third lens and the fourth lens are cemented together.

8. The wide-angle lens according to claim 3, wherein: The third lens has positive refractive power, and the fourth lens has negative refractive power.

9. The wide-angle lens according to claim 8, characterized in that: The third lens comprises a convex surface facing the object side and another convex surface facing the image side; The fourth lens comprises a concave surface facing the object side and another concave surface facing the image side; The fifth lens further includes another convex surface facing the image side; and The sixth lens further includes another convex surface facing the object side.

10. The wide-angle lens according to any one of claims 1 to 9, characterized in that: The invention further comprises an aperture disposed between the fifth lens and the seventh lens, and the wide-angle lens satisfies at least one of the following conditions: 0.4≤T11ST / TTL≤0.6; 0.2≤Nd8-Nd7≤0.5; 5≤(fSF1+fSR1) / f≤22; Wherein, T11ST is the distance between the object side surface of the first lens and the aperture surface on the optical axis, TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, Nd7 is the refractive index of the seventh lens, Nd8 is the refractive index of the eighth lens, fSF1 is the effective focal length of the lens closest to the object side of the aperture, and fSR1 is the effective focal length of the lens closest to the image side of the aperture.

Images