TWI852555B - Wide-angle lens assembly - Google Patents

Abstract

A wide-angle lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first, fourth, fifth, seventh, and eighth lenses are with refractive power. The second, third, and sixth lenses are with positive refractive power. An image side surface of the fourth lens is cemented with an object side surface of the fifth lens on a first cemented surface. An image side surface of the seventh lens is cemented with an object side surface of the eighth lens on a second cemented surface. The wide-angle lens assembly satisfies at least one of following conditions: 0.8

f/D22

3; 0.025 degrees^-1

1/α

0.3 degrees^-1; 0.03 degrees^-1

1/β

0.35 degrees^-1; 0.5

α/β

Description

Wide-angle lens (forty-seven)

The present invention relates to a wide-angle lens.

In order to improve the field of view and image quality, today's wide-angle lenses often use up to eight lens structures to form a wide-angle lens. When the number of lenses increases, it is easy to cause lens tilt and eccentricity during the wide-angle lens assembly process, which reduces the production yield. The conventional wide-angle lens can no longer meet the current needs. A wide-angle lens with a new structure is needed to meet the needs of large field of view, high image quality and high production yield at the same time.

In view of this, the main purpose of the present invention is to provide a wide-angle lens that utilizes a double-glue lens design to reduce lens tilt and eccentricity caused by excessive number of lenses during the lens assembly process, so that the wide-angle lens can simultaneously meet the requirements of large field of view, high imaging quality and high production yield.

f/D22

3；0.025度^-1

1/α

0.3度^-1；0.03度^-1

1/β

0.35度^-1；0.5

α/β

30；其中，f為廣角鏡頭之一有效焦距，D22第二透鏡之一像側面之一光學有效直徑，α為一第一膠合面之一最大切線角度，β為一第二膠合面之一最大切線角度。當本發明之廣角鏡頭滿足上述特徵及其中至少一條件且不需其他額外的特徵或條件，即可達成本發明之廣角鏡頭之基本功能。 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 and an eighth lens. The first lens has a refractive power. The second lens has a positive refractive power. The third lens has a positive refractive power. The fourth lens has a refractive power. The fifth lens has a refractive power. The sixth lens has a positive refractive power. The seventh lens has a refractive power. The eighth lens has a refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are arranged in sequence from an object side to an image side along an optical axis. Wide-angle lens meets at least one of the following conditions: 0.8

f/D22

3; 0.025 degrees ^-1

1/α

0.3 degrees ^-1 ; 0.03 degrees ^-1

1/β

0.35 degrees ^-1 ; 0.5

α/β

30; wherein f is an effective focal length of the wide-angle lens, D22 is an optical effective diameter of an image-side surface of the second lens, α is a maximum tangent angle of a first bonding surface, and β is a maximum tangent angle of a second bonding surface. When the wide-angle lens of the present invention meets the above characteristics and at least one of the conditions and does not require other additional characteristics or conditions, the basic function of the wide-angle lens of the present invention can be achieved.

The first lens has negative refractive power, the fourth lens has positive refractive power, the fifth lens has negative refractive power, the seventh lens has positive refractive power, and the eighth lens has negative refractive power.

The first lens is a biconcave lens, and the first lens includes a concave surface facing the object side and another concave surface facing the image side; the second lens is a meniscus lens, and the second lens includes a convex surface facing the object side and a concave surface facing the image side; the third lens is a biconvex lens, and the third lens includes a convex surface facing the object side and another convex surface facing the image side; the sixth lens is a biconvex lens, and the sixth lens includes a convex surface facing the object side and another convex surface facing the image side.

The fourth lens includes a convex surface facing the object side; the fifth lens includes a concave surface facing the image side; the seventh lens includes a convex surface facing the object side; and the eighth lens includes a concave surface facing the image side.

The fourth lens is a biconvex lens, and further includes another convex surface facing the image side; the fifth lens is a biconcave lens, and further includes another concave surface facing the object side.

The seventh lens is a biconvex lens, and further includes another convex surface facing the image side; the eighth lens is a biconcave lens, and further includes another concave surface facing the object side.

The seventh lens is a meniscus lens and further includes a concave surface facing the image side; the eighth lens is a meniscus lens and further includes a convex surface facing the object side.

An image side surface of the fourth lens and an object side surface of the fifth lens are glued to the first glued surface, and an image side surface of the seventh lens and an object side surface of the eighth lens are glued to the second glued surface.

The wide-angle lens of the present invention may further include an aperture disposed between the second lens and the third lens.

R51/R72

3：0

T1131/T3152

3；0

T1131/T6182

3；0

T3152/T6182

3；其中R51為該第五透鏡之該物側面之一曲率半徑，R72為該第七透鏡之該像側面之一曲率半徑，T1131為該第一透鏡之一物側面至該第三透鏡之一物側面於該光軸上之一間距，T3152為該第三透鏡之該物側面至該第五透鏡之一像側面於該光軸上之一間距，T6182為該第六透鏡之一物側面至該第八透鏡之一像側面於該光軸上之一間距。 The wide-angle lens meets at least one of the following conditions: -3

R51/R72

3:0

T1131/T3152

3;0

T1131/T6182

3;0

T3152/T6182

3; wherein R51 is a curvature radius of the object side surface of the fifth lens, R72 is a curvature radius of the image side surface of the seventh lens, T1131 is a distance from an object side surface of the first lens to an object side surface of the third lens on the optical axis, T3152 is a distance from the object side surface of the third lens to an image side surface of the fifth lens on the optical axis, and T6182 is a distance from an object side surface of the sixth lens to an image side surface of the eighth lens on the optical axis.

In order to make the above-mentioned purposes, features, and advantages of the present invention more clearly understood, the following specifically cites preferred embodiments and provides detailed descriptions with the accompanying drawings.

1, 2, 3, 4: Wide-angle lens

L11, L21, L31, L41: First lens

L12, L22, L32, L42: Second lens

L13, L23, L33, L43: Third lens

L14, L24, L34, L44: Fourth lens

L15, L25, L35, L45: Fifth lens

L16, L26, L36, L46: Sixth lens

L17, L27, L37, L47: Seventh lens

L18, L28, L38, L48: Eighth lens

ST1, ST2, ST3, L4: Aperture

OF1, OF2, OF3, OF4: Filters

IMA1, IMA2, IMA3, IMA4: imaging surface

OA1, OA2, OA3, OA4: optical axis

S11, S21, S31, S41: Object side of the first lens

S12, S22, S32, S42: First lens image side

S13, S23, S33, L43: Second lens object side

S14, S24, S34, S44: Second lens image side

S16, S26, S36, S46: Third lens object side

S17, S27, S37, S47: Third lens image side

S18, S28, S38, S48: fourth lens object side

S19, S29, S39, S49: Fourth lens image side

S19, S29, S39, S49: Fifth lens object side

S110, S210, S310, S410: Fifth lens image side

S111, S211, S311, S411: sixth lens object side

S112, S212, S312, S412: Sixth lens image side

S113, S213, S313, S413: seventh lens object side

S114, S214, S314, S414: Side view of the seventh lens

S114, S214, S314, S414: The eighth lens object side

S115, S215, S315, S415: Eighth lens image side

S116, S216, S316, S416: Object side of filter

S117, S217, S317, S417: filter image side

S15, S25, S35, S45: aperture surface

CS45: First bonding surface

CS78: Second bonding surface

α: Maximum tangent angle of the first bonding surface

β: Maximum tangent angle of the second bonding surface

Figure 1 is a schematic diagram of the lens configuration of the first embodiment of the wide-angle lens of the present invention.

Figures 2, 3, and 4 are respectively the field curvature diagram, distortion diagram, and modulation transfer function diagram of the first embodiment of the wide-angle lens of the present invention.

Figure 5 is a schematic diagram of the lens configuration of the second embodiment of the wide-angle lens of the present invention.

Figures 6, 7, and 8 are respectively the field curvature diagram, distortion diagram, and modulation transfer function diagram of the second embodiment of the wide-angle lens of the present invention.

Figure 9 is a schematic diagram of the lens configuration of the third embodiment of the wide-angle lens of the present invention.

Figures 10, 11, and 12 are respectively the field curvature diagram, distortion diagram, and modulation transfer function diagram of the third embodiment of the wide-angle lens of the present invention.

Figure 13 is a schematic diagram of the lens configuration of the fourth embodiment of the wide-angle lens of the present invention.

Figure 14 is a schematic diagram of the maximum tangent angle of the first bonding surface and the maximum tangent angle of the second bonding surface of the first embodiment of the wide-angle lens of the present invention.

f/D22

3；0.025度^-1

1/α

0.3度^-1；0.03度^-1

1/β

0.35度^-1；0.5

α/β

30；其中，f為該廣角鏡頭之一有效焦距，D22該第二透鏡之一像側面之一光學有效直徑，α為該第一膠合面之一最大 切線角度，β為該第二膠合面之一最大切線角度。當本發明之廣角鏡頭滿足上述特徵及其中至少一條件，為本發明之一較佳實施例。 The present invention provides a wide-angle lens, comprising: a first lens having refractive power; a second lens having positive refractive power; a third lens having positive refractive power; a fourth lens having refractive power; a fifth lens having refractive power; a sixth lens having positive refractive power; a seventh lens having refractive power; and an eighth lens having refractive power; wherein the first lens, the second lens, the third lens, the fourth lens The fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are arranged in sequence from an object side to an image side along an optical axis; wherein an image side surface of the fourth lens and an object side surface of the fifth lens are glued to a first glued surface, and an image side surface of the seventh lens and an object side surface of the eighth lens are glued to a second glued surface; wherein the wide-angle lens satisfies at least one of the following conditions: 0.8

f/D22

3; 0.025 degrees ^-1

1/α

0.3 degrees ^-1 ; 0.03 degrees ^-1

1/β

0.35 degrees ^-1 ; 0.5

α/β

30; wherein f is an effective focal length of the wide-angle lens, D22 is an optical effective diameter of an image-side surface of the second lens, α is a maximum tangent angle of the first bonding surface, and β is a maximum tangent angle of the second bonding surface. 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.

Please refer to Table 1, Table 2, Table 4, Table 5, Table 7, Table 8, Table 10 and Table 11 below, wherein Table 1, Table 4, Table 7 and Table 10 are respectively tables of relevant parameters of each lens according to the first embodiment to the fourth embodiment of the wide-angle lens of the present invention, and Table 2, Table 5, Table 8 and Table 11 are respectively tables of relevant parameters of the aspherical surface of the aspherical lens in Table 1, Table 4, Table 7 and Table 10. In the following embodiments, the aspheric surface concavity z 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 +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ +Gh ¹⁶ +Hh ¹⁸ +Ih ²⁰ , wherein: 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~I are aspheric coefficients, and the aspheric coefficients can be expressed in scientific notations, for example, 2E-03 represents 2×10 ^-3 .

Figures 1, 5, 9, and 13 are schematic diagrams of the lens configuration of the first, second, third, and fourth embodiments of the wide-angle lens of the present invention. The first lens L11, L21, L31, and L41 are biconcave lenses with negative refractive power, and their object side surfaces S11, S21, S31, and S41 are concave surfaces, and the image side surfaces S12, S22, S32, and S42 are concave surfaces. The object side surfaces S11, S21, S31, and S41 and the image side surfaces S12, S22, S32, and S42 are all spherical surfaces.

The second lenses L12, L22, L32, and L42 are meniscus lenses with positive refractive power. The object side surfaces S13, S23, S33, and S43 are convex, and the image side surfaces S14, S24, S34, and S34 are concave. The object side surfaces S13, S23, S33, and S43 and the image side surfaces S14, S24, S34, and S34 are all spherical surfaces.

The third lens L13, L23, L33, and L43 are biconvex lenses with positive refractive power. The object side surfaces S16, S26, S36, and S46 are convex, and the image side surfaces S17, S27, S37, and S47 are convex. The object side surfaces S16, S26, S36, and S46 and the image side surfaces S17, S27, S37, and S47 are all aspherical surfaces.

The fourth lens L14, L24, L34, L44 is a biconvex lens with positive refractive power, and its object side surfaces S18, S28, S38, S48 are convex surfaces, and the image side surfaces S19, S29, S39, S49 are convex surfaces. The object side surfaces S18, S28, S38, S48 and the image side surfaces S19, S29, S39, S49 are all spherical surfaces.

The fifth lens L15, L25, L35, and L45 are biconcave lenses with negative refractive power. The object side surfaces S19, S29, S39, and S49 are concave surfaces, and the image side surfaces S110, S210, S310, and S410 are concave surfaces. The object side surfaces S19, S29, S39, and S49 and the image side surfaces S110, S210, S310, and S410 are all spherical surfaces.

The image side surfaces S19, S29, S39, S49 of the fourth lens L14, L24, L34, L44 and the object side surfaces S19, S29, S39, S49 of the fifth lens L15, L25, L35, L45 are bonded to a first bonding surface. The first bonding surface is the image side surfaces S19, S29, S39, S49 of the fourth lens L14, L24, L34, L44 or the object side surfaces S19, S29, S39, S49 of the fifth lens L15, L25, L35, L45.

The sixth lens L16, L26, L36, and L46 are biconvex lenses with positive refractive power, and their object side surfaces S111, S211, S311, and S411 are convex surfaces, and their image side surfaces S112, S212, S312, and S412 are convex surfaces. The object side surfaces S111, S211, S311, and S411 and the image side surfaces S112, S212, S312, and S412 are all aspherical surfaces.

The seventh lens L17, L27, L37, L47 has positive refractive power, and its object side surfaces S113, S213, S313, S413 are convex surfaces, and the object side surfaces S113, S213, S313, S413 and the image side surfaces S114, S214, S314, S414 are all spherical surfaces.

The eighth lens L18, L28, L38, L48 has negative refractive power, and its image side surfaces S115, S215, S315, S415 are concave surfaces, and the object side surfaces S114, S214, S314, S414 and the image side surfaces S115, S215, S315, S415 are all spherical surfaces.

The image side surfaces S114, S214, S314, S414 of the seventh lens L17, L27, L37, L47 and the object side surfaces S114, S214, S314, S414 of the eighth lens L18, L28, L38, L48 are bonded to the second bonding surface. The second bonding surface is the image side surfaces S114, S214, S314, S414 of the seventh lens L17, L27, L37, L47 or the object side surfaces S114, S214, S314, S414 of the eighth lens L18, L28, L38, L48.

In addition, wide-angle lenses 1, 2, 3, and 4 meet at least one of the following conditions (1) to (8):

Wherein, f is an effective focal length of the wide-angle lens 1, 2, 3, 4 in the first to fourth embodiments, D22 is an optical effective diameter of the image side surface S14, S24, S34, S44 of the second lens L12, L22, L32, L42 in the first to fourth embodiments, α is a maximum tangent angle of the first bonding surface of the fourth lens L14, L24, L34, L44 and the fifth lens L15, L25, L35, L45 in the first to fourth embodiments, β is a maximum tangent angle of the seventh lens L17, L27, L37, L47 and the eighth lens L18, L28, L39 in the first to fourth embodiments. 8, L48 is a maximum tangent angle of the second bonding surface of the bonding, and the diagram of α and β can refer to FIG. 14 (taking the first embodiment as an example), wherein symbol L14 is the fourth lens, symbol L15 is the fifth lens, symbol CS45 is the first bonding surface, symbol α is the maximum tangent angle of the first bonding surface CS45, symbol L17 is the seventh lens, symbol L18 is the eighth lens, symbol CS78 is the second bonding surface, symbol β is the maximum tangent angle of the second bonding surface CS78, and R51 is a curvature of one of the object side surfaces S19, S29, S39, S49 of the fifth lens L15, L25, L35, L45 in the first to fourth embodiments. R72 is a curvature radius of the image side surface S114, S214, S314, S414 of the seventh lens L17, L27, L37, L47 in the first to fourth embodiments, T1131 is a distance between the object side surface S11, S21, S31, S41 of the first lens L11, L21, L31, L41 and the object side surface S16, S26, S36, S46 of the third lens L13, L23, L33, L43 on the optical axis OA1, OA2, OA3, OA4 in the first to fourth embodiments, T3152 is a distance between the object side surface S11, S21, S31, S41 of the first lens L11, L21, L31, L41 and the object side surface S16, S26, S36, S46 of the third lens L13, L23, L33, L43 in the first to fourth embodiments, T6182 is a distance between the object side surfaces S16, S26, S36, S46 of L33, L43 and the image side surfaces S110, S210, S310, S410 of the fifth lens L15, L25, L35, L45 on the optical axes OA1, OA2, OA3, OA4. In the first to fourth embodiments, T6182 is a distance between the object side surfaces S111, S211, S311, S411 of the sixth lens L16, L26, L36, L46 and the image side surfaces S115, S215, S315, S415 of the eighth lens L18, L28, L38, L48 on the optical axes OA1, OA2, OA3, OA4. This allows wide-angle lenses 1, 2, 3, and 4 to effectively reduce the aperture value, effectively increase the field of view, effectively improve the resolution, and effectively correct aberrations.

1/α

0.3度^-1或條件(4)：0.03度^-1

1/β

0.35度^-1或條件(5)：0.5

α/β

30時，可有效減少透鏡傾斜與偏心誤差。 When condition (3) is met: 0.025 degrees ^-1

1/α

0.3 degrees ^-1 or condition (4): 0.03 degrees ^-1

1/β

0.35 degrees ^-1 or condition (5): 0.5

α/β

30, it can effectively reduce lens tilt and decentration errors.

The first embodiment of the wide-angle lens of the present invention is described in detail. The wide-angle lens 1 includes a first lens L11, a second lens L12, an aperture ST1, a third lens L13, a fourth lens L14, a fifth lens L15, a sixth lens L16, a seventh lens L17, an eighth lens L18 and a filter OF1 in sequence from an object side to an image side along an optical axis OA1. When imaging, the light from the object side is finally imaged on an imaging surface IMA1. According to the first to twelfth paragraphs of [Implementation Method], the seventh lens L17 is a biconvex lens, and its image side surface S114 is a convex surface; the eighth lens L18 is a biconcave lens, and its object side surface S114 is a concave surface; the object side surface S116 and the image side surface S117 of the filter OF1 are both planes; by using the above-mentioned lens, aperture ST1 and the design that satisfies at least one of the conditions (1) to (8), the wide-angle lens 1 can effectively reduce the aperture value, effectively improve the field of view, effectively improve the resolution, and effectively correct the aberration.

Table 1 is a table of relevant parameters of each lens of the wide-angle lens 1 in Figure 1.

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

Table 3 shows the relevant parameter values of the wide-angle lens 1 of the first embodiment and the calculated values of the corresponding conditions (1) to (8). 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 (8).

In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirements. As can be seen from Figure 2, the field curvature of the wide-angle lens 1 of the first embodiment is between -0.02mm and 0.03mm. As can be seen from Figure 3, the distortion of the wide-angle lens 1 of the first embodiment is between -7% and 0%. As can be seen from Figure 4, the modulation transfer function value of the wide-angle lens 1 of the first embodiment is between 0.56 and 1.0. It is obvious that the field curvature and distortion of the wide-angle lens 1 of the first embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

The second embodiment of the wide-angle lens of the present invention is described in detail. The wide-angle lens 2 includes a first lens L21, a second lens L22, an aperture ST2, a third lens L23, a fourth lens L24, a fifth lens L25, a sixth lens L26, a seventh lens L27, an eighth lens L28 and a filter OF2 in sequence from an object side to an image side along an optical axis OA2. When imaging, the light from the object side is finally imaged on an imaging surface IMA2. According to the first to twelfth paragraphs of [Implementation Method], the seventh lens L27 is a biconvex lens, and its image side surface S214 is a convex surface; the eighth lens L28 is a biconcave lens, and its object side surface S214 is a concave surface; the object side surface S216 and the image side surface S217 of the filter OF2 are both planes; by using the above-mentioned lens, aperture ST2 and the design that satisfies at least one of the conditions (1) to (8), the wide-angle lens 2 can effectively reduce the aperture value, effectively improve the field of view, effectively improve the resolution, and effectively correct the aberration.

Table 4 is a table of relevant parameters of each lens of the wide-angle lens 2 in Figure 5.

Table 5 is a table of relevant parameters of the aspherical surface of the aspherical lens in Table 4.

Table 6 shows the relevant parameter values of the wide-angle lens 2 of the second embodiment and the calculated values of the corresponding conditions (1) to (8). 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 (8).

In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also meet the requirements. As can be seen from Figure 6, the field curvature of the wide-angle lens 2 of the second embodiment is between -0.04mm and 0.03mm. As can be seen from Figure 7, the distortion of the wide-angle lens 2 of the second embodiment is between -7% and 0%. As can be seen from Figure 8, the modulation transfer function value of the wide-angle lens 2 of the second embodiment is between 0.39 and 1.0. It is obvious that the field curvature and distortion of the wide-angle lens 2 of the second embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

The third embodiment of the wide-angle lens of the present invention is described in detail. The wide-angle lens 3 includes a first lens L31, a second lens L32, an aperture ST3, a third lens L33, a fourth lens L34, a fifth lens L35, a sixth lens L36, a seventh lens L37, an eighth lens L38 and a filter OF3 in order from an object side to an image side along an optical axis OA3. When imaging, the light from the object side is finally imaged on an imaging surface IMA3. According to the first to twelfth paragraphs of [Implementation Method], the seventh lens L37 is a meniscus lens, and its image side surface S314 is a concave surface; the eighth lens L38 is a meniscus lens, and its object side surface S314 is a convex surface; the object side surface S316 and the image side surface S317 of the filter OF3 are both planes; by using the above-mentioned lens, aperture ST3 and the design that satisfies at least one of the conditions (1) to (8), the wide-angle lens 3 can effectively reduce the aperture value, effectively improve the field of view, effectively improve the resolution, and effectively correct the aberration.

Table 7 is a table of relevant parameters of each lens of the wide-angle lens 3 in Figure 9.

Table 8 is a table of relevant parameters of the aspherical surface of the aspherical lens in Table 7.

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 (8). 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 (8).

In addition, the optical performance of the wide-angle lens 3 of the third embodiment can also meet the requirements. As can be seen from Figure 10, the field curvature of the wide-angle lens 3 of the third embodiment is between -0.04mm and 0.03mm. As can be seen from Figure 11, the distortion of the wide-angle lens 3 of the third embodiment is between -35% and 0%. As can be seen from Figure 12, the modulation transfer function value of the wide-angle lens 3 of the third embodiment is between 0.45 and 1.0. It is obvious that the field curvature and distortion of the wide-angle lens 3 of the third embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

The fourth embodiment of the wide-angle lens of the present invention is described in detail. The wide-angle lens 4 includes a first lens L41, a second lens L42, an aperture ST4, a third lens L43, a fourth lens L44, a fifth lens L45, a sixth lens L46, a seventh lens L47, an eighth lens L48 and a filter OF4 in order from an object side to an image side along an optical axis OA4. When imaging, the light from the object side is finally imaged on an imaging surface IMA4. According to the first to twelfth paragraphs of [Implementation Method], the seventh lens L47 is a meniscus lens, and its image side surface S414 is a concave surface; the eighth lens L48 is a meniscus lens, and its object side surface S414 is a convex surface; the object side surface S416 and the image side surface S417 of the filter OF4 are both planes; by using the above-mentioned lens, aperture ST4 and the design that satisfies at least one of the conditions (1) to (8), the wide-angle lens 4 can effectively reduce the aperture value, effectively improve the field of view, effectively improve the resolution, and effectively correct the aberration.

Table 10 is a table of relevant parameters of each lens of the wide-angle lens 4 in Figure 13.

Table 11 is a table of relevant parameters of the aspherical surface of the aspherical lens in Table 10.

Table 12 shows the relevant parameter values of the wide-angle lens 4 of the fourth embodiment and the calculated values corresponding to conditions (1) to (8). It can be seen from Table 12 that the wide-angle lens 4 of the fourth embodiment can meet the requirements of conditions (1) to (8).

Although the present invention has been disclosed as above in the preferred implementation mode, it is not intended to limit the present invention. Anyone familiar with this technology can 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 subject to the scope of the attached patent application.

1: Wide-angle lens

L11: First lens

L12: Second lens

ST1 aperture

L13: Third lens

L14: The fourth lens

L15: Fifth lens

L16 sixth lens

L17: Seventh lens

L18: Eighth lens

OF1: Filter

IMA1 imaging surface

OA1: optical axis

S11: Object side of the first lens

S12: Side view of the first lens

S13: Second lens object side

S14: Second lens image side

S15: Aperture surface

S16: Third lens object side

S17: Third lens image side

S18: Fourth lens object side

S19: Fourth lens image side

S19: Fifth lens object side

S110: Fifth lens image side

S111: sixth lens object side

S112: Sixth lens image side

S113: seventh lens object side

S114: Side view of the seventh lens

S114: The eighth lens object side

S115: Side view of the eighth lens

S116: Object side of filter

S117: Filter image side

Claims (10)

A wide-angle lens comprising: A first lens has refractive power; A second lens has positive refractive power; A third lens has positive refractive power; A fourth lens has refractive power; 1. The fifth lens has refractive power; 1. The sixth lens has positive refractive power; A seventh lens has refractive power; and 一The eighth lens has refractive power; The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are arranged in sequence along an optical axis from an object side to an image side; The wide-angle lens meets at least one of the following conditions: 0.8

f/D22

3; 0.025 degrees ^-1

1/α

0.3 degrees ^-1 ; 0.03 degrees ^-1

1/β

0.35 degrees ^-1 ; 0.5

α/β

30; Wherein, f is an effective focal length of the wide-angle lens, D2.2 is an optical effective diameter of an image-side surface of the second lens, α is a maximum tangent angle of a first bonding surface, and β is a maximum tangent angle of a second bonding surface. The wide-angle lens as described in item 1 of the patent application, wherein the first lens has negative refractive power, the fourth lens has positive refractive power, the fifth lens has negative refractive power, the seventh lens has positive refractive power, and the eighth lens has negative refractive power. A wide-angle lens as described in Item 2 of the patent application, wherein: The first lens is a biconcave lens, and the first lens includes a concave surface facing the object side and another concave surface facing the image side; The second lens is a meniscus lens, and the second lens includes a convex surface facing the object side and a concave surface facing the image side; The third lens is a biconvex lens, and the third lens includes a convex surface facing the object side and another convex surface facing the image side; and The sixth lens is a double convex lens, and the sixth lens includes a convex surface facing the object side and another convex surface facing the image side. A wide-angle lens as described in item 3 of the patent application, wherein: The fourth lens includes a convex surface facing the object side; The fifth lens includes a concave surface facing the image side; The seventh lens includes a convex surface facing the object side; and The eighth lens includes a concave surface facing the image side. A wide-angle lens as described in Item 4 of the patent application, wherein: The fourth lens is a biconvex lens and further includes another convex surface facing the image side; and The fifth lens is a biconcave lens and further includes another concave surface facing the object side. A wide-angle lens as described in Item 5 of the patent application, wherein: The seventh lens is a biconvex lens and further includes another convex surface facing the image side; and The eighth lens is a biconcave lens and further includes another concave surface facing the object side. A wide-angle lens as described in Item 5 of the patent application, wherein: The seventh lens is a meniscus lens and further includes a concave surface facing the image side; and The eighth lens is a meniscus lens and further includes a convex surface facing the object side. As described in item 1 of the patent application scope, the wide-angle lens, wherein an image side surface of the fourth lens and an object side surface of the fifth lens are bonded to the first bonding surface, and an image side surface of the seventh lens and an object side surface of the eighth lens are bonded to the second bonding surface. The wide-angle lens described in Item 1 of the patent application further includes an aperture disposed between the second lens and the third lens. A wide-angle lens as described in any one of the claims 1 to 9 of the patent application, wherein the wide-angle lens satisfies at least one of the following conditions: -3

R51/R72

3; 0

T1131/T3152

3; 0

T1131/T6182

3; 0

T3152/T6182

3; Among them, R51 is a radius of curvature of the object side surface of the fifth lens, R72 is a radius of curvature of the image side surface of the seventh lens, T1131 is a distance from an object side surface of the first lens to an object side surface of the third lens on the optical axis, T3152 is a distance from the object side surface of the third lens to an image side surface of the fifth lens on the optical axis, and T6182 is a distance from an object side surface of the sixth lens to an image side surface of the eighth lens on the optical axis.

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