TWI727544B - 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, an eighth lens, and a ninth lens. The first lens is with negative refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens is with negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The third lens is a biconcave lens with negative refractive power. The fourth and fifth lenses are biconvex lenses with positive refractive power. The sixth lens is with positive refractive power and includes a convex surface facing the image side. The seventh lens is with negative refractive power and includes a concave surface facing the object side. The eighth lens is with positive refractive power and includes a convex surface facing the object side. The ninth lens is with positive refractive power and includes a concave surface facing the object side and a convex surface facing the image side.

Description

Wide-angle lens (27)

The invention relates to a wide-angle lens.

The field of view of today's wide-angle lenses is getting larger and larger. Although it can shoot images with a wide field of view, the smaller the image is, the smaller the image outside. With different application requirements, it is necessary to capture visible light images during the day and infrared images at night. Conventional wide-angle lenses often cannot take into account the image quality of visible light and infrared light at the same time. Therefore, a new wide-angle lens with a new architecture is needed to meet the requirements at the same time. Meet the above needs.

In view of this, the main purpose of the present invention is to provide a wide-angle lens, which has a larger field of view, the peripheral image is not too small, can take into account the image quality of visible light and infrared light at the same time, and is resistant to environmental temperature changes, but still has good optical performance.

The wide-angle lens of the present invention 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 and includes a convex surface facing an object side and a concave surface facing an image side. The second lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The third lens has negative refractive power and includes a concave surface facing the object side and another concave surface facing the image side. The fourth lens has positive refractive power and includes a convex surface facing the object side and another convex surface facing the image side. The fifth lens has positive refractive power and includes a convex surface facing the object side and another convex surface facing the image side. The sixth lens has positive refractive power and includes a convex surface facing the image side. The seventh lens has negative refractive power and includes a concave surface facing the object side. The eighth lens has positive refractive power and includes a convex surface facing the object side. The ninth lens has positive refractive power and includes a concave surface facing the object side and 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 order from the object side to the image side along an optical axis.

It may further include an aperture set between the fifth lens and the sixth lens, and the sixth lens and the seventh lens are cemented.

The sixth lens may further include another convex surface facing the object side, the seventh lens may further include another concave surface facing the image side, and the eighth lens may further include another convex surface facing the image side.

5%；其中，DT為廣角鏡頭之一F-Theta畸變。 The wide-angle lens meets the following conditions: |DT|

5%; Among them, DT is the F-Theta distortion of one of the wide-angle lenses.

The wide-angle lens satisfies the following conditions: |P _V-IR |<8μm; among them, P _V-IR is the difference between the position of the clearest imaging surface of the center of the wide-angle lens in visible light and the position of the clearest imaging surface of the center of the wide-angle lens in infrared light .

Among them, the wide-angle lens satisfies the following conditions: 3.3mm<BFL<4mm; among them, BFL is the distance between an image side of the ninth lens and an image surface of the optical axis.

1/(Nd₁×f₁)+1/(Nd₂×f₂)+1/(Nd₃×f₃)+1/(Nd₄×f₄)+1/(Nd₅×f₅)+1/(Nd₆×f₆)+1/(Nd₇×f₇)+1/(Nd₈×f₈)+1/(Nd₉×f₉)

0.7mm^-1；其中，Nd₁為第一透鏡之一折射率，Nd₂為第二透鏡之一折射率，Nd₃為第三透鏡之一折射率，Nd₄為第四透鏡之一折射率，Nd₅為第五透鏡之一折射率，Nd₆為第六 透鏡之一折射率，Nd₇為第七透鏡之一折射率，Nd₈為第八透鏡之一折射率，Nd₉為第九透鏡之一折射率，f₁為第一透鏡之一有效焦距，f₂為第二透鏡之一有效焦距，f₃為第三透鏡之一有效焦距，f₄為第四透鏡之一有效焦距，f₅為第五透鏡之一有效焦距，f₆為第六透鏡之一有效焦距，f₇為第七透鏡之一有效焦距，f₈為第八透鏡之一有效焦距，f₉為第九透鏡之一有效焦距。 The wide-angle lens meets the following conditions: -0.7mm ^-1

1/(Nd ₁ ×f ₁ )+1/(Nd ₂ ×f ₂ )+1/(Nd ₃ ×f ₃ )+1/(Nd ₄ ×f ₄ )+1/(Nd ₅ ×f ₅ )+ 1/(Nd ₆ ×f ₆ )+1/(Nd ₇ ×f ₇ )+1/(Nd ₈ ×f ₈ )+1/(Nd ₉ ×f ₉ )

0.7mm ^-1 ; where Nd ₁ is a refractive index of the first lens, Nd ₂ is a refractive index of the second lens, Nd ₃ is a refractive index of the third lens, and Nd ₄ is a refractive index of the fourth lens , Nd ₅ is a refractive index of the fifth lens, Nd ₆ is a refractive index of the sixth lens, Nd ₇ is a refractive index of the seventh lens, Nd ₈ is a refractive index of the eighth lens, and Nd ₉ is a ninth lens. The refractive index of one lens, f ₁ is an effective focal length of the first lens, f ₂ is an effective focal length of the second lens, f ₃ is an effective focal length of the third lens, and f ₄ is an effective focal length of the fourth lens. f ₅ is an effective focal length of the fifth lens, f ₆ is an effective focal length of the sixth lens, f ₇ is an effective focal length of the seventh lens, f ₈ is an effective focal length of the eighth lens, and f ₉ is a ninth lens One of the effective focal lengths.

The wide-angle lens satisfies the following conditions: 1.5<TTL/D ₁ <2; wherein, TTL is a distance between an object side of the first lens and an imaging surface on the optical axis, and D ₁ is an optical effective diameter of the first lens.

Vd₆-Vd₇

70；其中，Vd₆為第六透鏡之一阿貝係數，Vd₇為第七透鏡之一阿貝係數。 The wide-angle lens meets the following conditions: 50

Vd ₆ -Vd ₇

70; where Vd ₆ is one of the Abbe coefficients of the sixth lens, and Vd ₇ is one of the Abbe coefficients of the seventh lens.

The wide-angle lens satisfies the following conditions: 135 degrees/mm<FOV/f<170 degrees/mm; among them, FOV is the full field of view of one of the wide-angle lenses, and f is the effective focal length of one of the wide-angle lenses.

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

1, 2, 3‧‧‧Wide-angle lens

L11, L21, L31‧‧‧First lens

L12, L22, L32‧‧‧Second lens

L13, L23, L33‧‧‧third lens

L14, L24, L34‧‧‧Fourth lens

L15, L25, L35‧‧‧Fifth lens

ST1, ST2, ST3‧‧‧Aperture

L16, L26, L36‧‧‧Sixth lens

L17, L27, L37‧‧‧Seventh lens

L18, L28, L38‧‧‧Eighth lens

L19, L29, L39‧‧‧Ninth lens

OF1, OF2, OF3‧‧‧Filter

CG1, CG2, CG3‧‧‧Protection glass

IMA1, IMA2, IMA3‧‧‧imaging surface

OA1, OA2, OA3‧‧‧Optical axis

S11, S21, S31‧‧‧Object side of the first lens

S12, S22, S32‧‧‧The side of the first lens image

S13, S23, S33‧‧‧Object side of the second lens

S14, S24, S34‧‧‧Second lens image side

S15, S25, S35‧‧‧Object side of the third lens

S16, S26, S36‧‧‧Third lens image side

S17, S27, S37‧‧‧Object side of the fourth lens

S18, S28, S38‧‧‧Fourth lens image side

S19, S29, S39‧‧‧Fifth lens object side

S110, S210, S310‧‧‧Fifth lens image side

S111, S211, S311‧‧‧Aperture surface

S112, S212, S312‧‧‧Sixth lens object side

S113, S213, S313‧‧‧Sixth lens image side (7th lens object side)

S114, S214, S314‧‧‧Seventh lens image side

S115, S215, S315‧‧‧Object side of the eighth lens

S116, S216, S316‧‧‧8th lens image side

S117, S217, S317‧‧‧Object side of the ninth lens

S118, S218, S318‧‧‧Ninth lens image side

S119, S219, S319‧‧‧The side of the filter object

S120, S220, S320‧‧‧Filter image side

S121, S221, S321‧‧‧Protect the side of the glass object

S122, S222, S322‧‧‧Protect the side of the glass image

FIG. 1 is a schematic diagram of the lens arrangement and optical path of the first embodiment of the wide-angle lens according to the present invention.

Fig. 2A is a longitudinal aberration diagram of the first embodiment of the wide-angle lens according to the present invention.

Figure 2B is the Field Curvature of the first embodiment of the wide-angle lens according to the present invention Figure.

Figure 2C is a distortion diagram of the first embodiment of the wide-angle lens according to the present invention.

FIG. 3 is a schematic diagram of the lens configuration and optical path of the second embodiment of the wide-angle lens according to the present invention.

Fig. 4A is a longitudinal aberration diagram of the second embodiment of the wide-angle lens according to the present invention.

Figure 4B is a field curvature diagram of the second embodiment of the wide-angle lens according to the present invention.

Figure 4C is a distortion diagram of the second embodiment of the wide-angle lens according to the present invention.

FIG. 5 is a schematic diagram of the lens arrangement and optical path of the third embodiment of the wide-angle lens according to the present invention.

Fig. 6A is a longitudinal aberration diagram of the third embodiment of the wide-angle lens according to the present invention.

Fig. 6B is a field curvature diagram of the third embodiment of the wide-angle lens according to the present invention.

Fig. 6C is a distortion diagram of the third embodiment of the wide-angle lens according to the present invention.

The present invention provides a wide-angle lens, including: a first lens having negative refractive power, the first lens including a convex surface facing an object side and a concave surface facing an image side; a second lens having negative refractive power, the second lens including a convex surface Facing the object side and a concave surface toward the image side; a third lens with negative refractive power, the third lens including a concave surface facing the object side and another concave surface facing the image side; a fourth lens with positive refractive power, the fourth lens includes a The convex surface faces the object side and the other convex surface faces the image side; a fifth lens has positive refractive power, the fifth lens includes a convex surface facing the object side and the other convex surface facing the image side; a sixth lens has positive refractive power, this sixth lens It includes a convex surface facing the image side; a seventh lens with negative refractive power, the seventh lens includes a concave surface facing the object side; an eighth lens with positive refractive power, the eighth lens includes a convex surface facing the object side; and a ninth lens The lens has positive refractive power. The ninth lens includes a concave surface facing the object side and 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, and the seventh lens The eighth lens and the ninth lens are arranged in order from the object side to the image side along an optical axis.

Please refer to Table 1, Table 2, Table 4, Table 5, Table 7 and Table 8 below. Table 1, Table 4 and Table 7 are the lenses of the first embodiment to the third embodiment of the wide-angle lens according to the present invention. The related parameter table, Table 2, Table 5 and Table 8 are the relevant parameter table of the aspheric surface of the aspheric lens in Table 1, Table 4 and Table 7, respectively.

Figures 1, 3, and 5 are schematic diagrams of the lens configuration and optical path of the first, second, and third embodiments of the wide-angle lens of the present invention. The first lenses L11, L21, and L31 are meniscus lenses with negative refractive power and are made of glass. The object side surfaces S11, S21, S31 are convex surfaces, the image side surfaces S12, S22, and S32 are concave surfaces, and the object side surfaces S11, S21, S31 and the image side surfaces S12, S22, S32 are spherical surfaces.

The second lenses L12, L22, and L32 are meniscus lenses with negative refractive power and are made of glass. The object side surfaces S13, S23, S33 are convex surfaces, the image side surfaces S14, S24, and S34 are concave surfaces, and the object side surfaces S13, S23, S33 and the image side surface S14, S24, S34 are all spherical surfaces.

The third lens L13, L23, and L33 are biconcave lenses with negative refractive power and are made of glass. The object side surfaces S15, S25, S35 are concave surfaces, the image side surfaces S16, S26, and S36 are concave surfaces, and the object side surfaces S15, S25, S35 and The image sides S16, S26, and S36 are all spherical surfaces.

The fourth lens L14, L24, L34 is a double convex lens with positive refractive power, made of glass material, its object side surface S17, S27, S37 is convex surface, the image side surface S18, S28, S38 is convex surface, the object side surface S17, S27, S37 and The image sides S18, S28, and S38 are all spherical surfaces.

The fifth lens L15, L25, L35 is a biconvex lens with positive refractive power, composed of glass The object side surface S19, S29, S39 is convex surface, the image side surface S110, S210, S310 is convex surface, the object side surface S19, S29, S39 and the image side surface S110, S210, S310 are all spherical surfaces.

The sixth lens L16, L26, and L36 are biconvex lenses with positive refractive power and are made of glass. The object side surfaces S112, S212, S312 are convex surfaces, and the image side surfaces S113, S213, and S313 are convex surfaces. The object side surfaces S112, S212, S312 and The image side surfaces S113, S213, and S313 are all spherical surfaces.

The seventh lens L17, L27, and L37 are biconcave lenses with negative refractive power and are made of glass. The object side surfaces S113, S213, S313 are concave surfaces, the image side surfaces S114, S214, and S314 are concave surfaces, and the object side surfaces S113, S213, S313 and The image sides S114, S214, and S314 are all spherical surfaces.

The eighth lens L18, L28, and L38 are biconvex lenses with positive refractive power and are made of glass. The object side surfaces S115, S215, S315 are convex surfaces, the image side surfaces S116, S216, and S316 are convex surfaces, and the object side surfaces S115, S215, S315 and S315 are convex. The image sides S116, S216, and S316 are all spherical surfaces.

The ninth lens L19, L29, and L39 are meniscus lenses with positive refractive power and are made of plastic material. The object side surfaces S117, S217, and S317 are concave surfaces, the image side surfaces S118, S218, and S318 are convex surfaces, and the object side surfaces S117, S217, S317 and the image side surface S118, S218, and S318 are all aspherical surfaces.

The sixth lenses L16, L26, and L36 are cemented with the seventh lenses L17, L27, and L37, respectively.

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

|P _V-IR |<8μm (2)

3.3mm<BFL<4mm (3)

1.5<TTL/D ₁ <2 (5)

135 degrees/mm<FOV/f<170 degrees/mm (7)

Among them, DT is F-Theta distortion in one of the wide-angle lenses 1, 2, and 3 in the _{first to third embodiments, and P V-IR} is in the first to third embodiments, The difference between the position of the imaging surface with the clearest center of the wide-angle lens 1, 2, 3 in visible light and the position of the imaging surface with the sharpest center of the wide-angle lens 1, 2, 3 in infrared light, BFL is the first to third embodiments Among them, the image side surfaces S118, S218, and S318 of the ninth lens L19, L29, and L39 are spaced from the imaging planes IMA1, IMA2, and IMA3 on the optical axis OA1, OA2, OA3, respectively, and Nd ₁ is the first embodiment to the third embodiment. In the embodiment, the refractive index of one of the first lenses L11, L21, L31, Nd ₂ is one of the refractive indexes of the first embodiment to the third embodiment, the second lens L12, L22, L32, and Nd ₃ is the first embodiment In the third embodiment, the third lens L13, L23, L33 has a refractive index, and Nd ₄ is the refractive index of the fourth lens L14, L24, L34 in the first embodiment to the third embodiment, and Nd ₅ The refractive index of one of the fifth lenses L15, L25, L35 in the _{first embodiment to the third embodiment, and Nd 6} is the refractive index of one of the sixth lenses L16, L26, L36 in the first embodiment to the third embodiment Nd ₇ is the refractive index of one of the seventh lenses L17, L27, L37 in the _{first embodiment to the third embodiment, and Nd 8} is the eighth lens L18, L28, L28, and L18 in the first embodiment to the third embodiment. A refractive index of L38, Nd ₉ is a refractive index of the ninth lens L19, L29, L39 in the first embodiment to the third embodiment, f is the wide-angle lens 1, 2 in the first embodiment to the third embodiment , 3 is the effective focal length, f ₁ is the effective focal length of one of the first lenses L11, L21, L31 in the _{first embodiment to the third embodiment, and f 2} is the second embodiment in the first embodiment to the third embodiment. One of the effective focal lengths of the lenses L12, L22, and L32, f ₃ is the effective focal length of one of the third lenses L13, L23, and L33 in the _{first to third embodiments, and f 4} is the first to third embodiments Among them, one of the effective focal lengths of the fourth lens L14, L24, and L34, f ₅ is the effective focal length of one of the fifth lenses L15, L25, L35 in the first embodiment to the third embodiment, and f ₆ is the effective focal length of the first embodiment to the third embodiment. In the third embodiment, one of the effective focal lengths of the sixth lenses L16, L26, L36, f ₇ is the effective focal length of one of the seventh lenses L17, L27, L37 in the first to third embodiments, and f ₈ is the first In the first to third embodiments, one of the effective focal lengths of the eighth lens L18, L28, L38, f ₉ is the effective focal length of one of the ninth lenses L19, L29, L39 in the first to third embodiments, TTL is in the first embodiment to the third embodiment, the object side surface S11, the first lens L11, L21, L31 S21, S31 are respectively a distance from the imaging planes IMA1, IMA2, and IMA3 on the optical axes OA1, OA2, OA3. D1 is _one of the first lenses L11, L21, L31 in the first embodiment to the third embodiment. The effective diameter, Vd ₆ is the Abbe coefficient of one of the sixth lenses L16, L26, L36 in the _{first embodiment to the third embodiment, and Vd 7} is the seventh lens L17, the seventh lens in the first embodiment to the third embodiment One of the Abbe coefficients of L27 and L37, FOV is the full field of view of one of the wide-angle lenses 1, 2, and 3 in the first embodiment to the third embodiment. The wide-angle lens 1, 2, 3 can effectively increase the field of view, effectively increase the surrounding image, effectively increase the back focal length (Back Focal Length), effectively enhance the infrared light image, effectively resist environmental temperature changes, and effectively correct the image Poor and effective correction of chromatic aberration.

5%時，可有效的增大周邊影像。 When condition (1) is met: |DT|

At 5%, it can effectively enlarge the surrounding image.

When the condition (2) is satisfied: |P _V-IR |<8μm, the optical performance of visible light image and infrared light image can be taken into account at the same time.

When the condition (3) is met: 3.3mm<BFL<4mm, the back focal length can be longer, which is beneficial to the assembly and manufacturing of the wide-angle lens.

1/(Nd₁×f₁)+1/(Nd₂×f₂)+1/(Nd₃×f₃)+1/(Nd₄×f₄)+1/(Nd₅×f₅)+1/(Nd₆×f₆)+1/(Nd₇×f₇)+1/(Nd₈×f₈)+1/(Nd₉×f₉)

0.7mm^-1時，可有最佳的修正場曲效果。 When condition (4) is met: -0.7mm ^-1

1/(Nd ₁ ×f ₁ )+1/(Nd ₂ ×f ₂ )+1/(Nd ₃ ×f ₃ )+1/(Nd ₄ ×f ₄ )+1/(Nd ₅ ×f ₅ )+ 1/(Nd ₆ ×f ₆ )+1/(Nd ₇ ×f ₇ )+1/(Nd ₈ ×f ₈ )+1/(Nd ₉ ×f ₉ )

When 0.7mm ^-1 , it has the best effect of correcting curvature of field.

When the condition (5) is met: 1.5<TTL/D ₁ <2, the total length of the lens can be shorter.

Vd₆-Vd₇

70時，可有較佳的消色差效果。 When condition (6) is met: 50

Vd ₆ -Vd ₇

At 70, it can have better achromatic effect.

When the condition (7) is met: 135 degrees/mm<FOV/f<170 degrees/mm, the distortion can be effectively controlled.

When the first to eighth lenses are glass spherical lenses and the ninth lens is a plastic aspheric lens, the number of lenses can be effectively reduced and the environmental temperature change can be effectively resisted.

The first embodiment of the wide-angle lens of the present invention will now be described in detail. Please refer to Figure 1, the wide-angle lens 1 includes a first lens L11, a second lens L12, a third lens L13, a fourth lens L14, and a A fifth lens L15, an aperture ST1, a sixth lens L16, a seventh lens L17, an eighth lens L18, a ninth lens L19, a filter OF1 and a protective glass CG1. When imaging, the light from the object side is the most After imaging on an imaging surface IMA1. According to the first to twelfth paragraphs of [Implementation Mode], in which:

The object side S119 and the image side S120 of the filter OF1 are both flat surfaces;

The object side S121 and the image side S122 of the protective glass CG1 are both flat surfaces;

Using the above-mentioned lens, aperture ST1, and a design that meets at least one of the conditions (1) to (7), the wide-angle lens 1 can effectively increase the field of view, effectively increase the peripheral image, effectively increase the back focus, and effectively improve Infrared image, effective resistance to environmental temperature changes, effective correction of aberration, effective correction of chromatic aberration.

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

The aspheric surface concavity z of the aspheric lens in Table 1 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

among them:

c: curvature;

h: the vertical distance from any point on the lens surface to the optical axis;

k: conic coefficient;

A~D: Aspheric coefficient.

Table 2 is a table of related parameters of the aspheric surface of the aspheric lens in Table 1, where k is the Conic Constant and A~D are the aspheric coefficients.

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 (7). From Table 3, it can be seen that the wide-angle lens 1 of the first embodiment can all satisfy the conditions (1) to The requirement of condition (7).

In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirements.

It can be seen from Fig. 2A that the longitudinal aberration of the wide-angle lens 1 of the first embodiment is between -0.005 mm and 0.02 mm.

It can be seen from Fig. 2B that the field curvature of the wide-angle lens 1 of the first embodiment is between -0.04mm and 0.03mm.

It can be seen from Figure 2C that the F-Theta distortion of the wide-angle lens 1 of the first embodiment is between -5% and 0%.

Obviously, the longitudinal aberration, curvature of field, and F-Theta distortion of the wide-angle lens 1 of the first embodiment can be effectively corrected to obtain better optical performance.

Please refer to FIG. 3, which is a schematic diagram of the lens configuration and optical path of the second embodiment of the wide-angle lens according to the present invention. The wide-angle lens 2 includes a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, a fifth lens L25, a fifth lens L25, and a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, a third lens L23, a second lens L22, a third lens L23, a third lens L23, a fourth lens L24, a third lens L23, a fourth lens L24, a third lens L23, a fourth lens L24, a The aperture ST2, a sixth lens L26, a seventh lens L27, an eighth lens L28, a ninth lens L29, a filter OF2 and a protective glass CG2. 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 Mode], in which:

The object side S219 and the image side S220 of the filter OF2 are both flat surfaces;

The protective glass CG2, the object side S221 and the image side S222 are both flat surfaces;

Using the above-mentioned lens, aperture ST2, and a design that satisfies at least one of the conditions (1) to (7), the wide-angle lens 2 can effectively increase the field of view, effectively increase the peripheral image, effectively increase the back focus, and effectively improve Infrared image, effective resistance to environmental temperature changes, effective correction of aberration, effective correction of chromatic aberration.

Table 4 is a table of related parameters of each lens of the wide-angle lens 2 in Figure 3.

The definition of the aspheric surface concavity z of the aspheric lens in Table 4 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 1 in the first embodiment, and will not be repeated here.

Table 5 is a table of related parameters of the aspheric surface of the aspheric lens in Table 4, where k is the Conic Constant, and A~D are the aspheric coefficients.

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 (7). From Table 6 it can be seen that the wide-angle lens 2 of the second embodiment can all satisfy the conditions (1) to The requirement of condition (7).

In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also meet the requirements.

It can be seen from FIG. 4A that the longitudinal aberration of the wide-angle lens 2 of the second embodiment is between -0.005mm and 0.02mm.

It can be seen from FIG. 4B that the field curvature of the wide-angle lens 2 of the second embodiment is between -0.03mm and 0.02mm.

It can be seen from Fig. 4C that the F-Theta distortion of the wide-angle lens 2 of the second embodiment is between -5% and 0%.

It is obvious that the longitudinal aberration, curvature of field, and F-Theta distortion of the wide-angle lens 2 of the second embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to FIG. 5, which is a schematic diagram of the lens configuration and optical path of the third embodiment of the wide-angle lens according to the present invention. The wide-angle lens 3 moves from one object side to one along an optical axis OA3 The image side sequentially includes 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, and a seventh lens L37 , An eighth lens L38, a ninth lens L39, a filter OF3 and a protective glass CG3. 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 Mode], in which:

The object side S319 and the image side S320 of the filter OF3 are both flat surfaces;

The protective glass CG3, the object side S321 and the image side S322 are both flat surfaces;

Using the above-mentioned lens, aperture ST3, and a design that meets at least one of the conditions (1) to (7), the wide-angle lens 3 can effectively increase the field of view, effectively increase the peripheral image, effectively increase the back focus, and effectively improve Infrared image, effective resistance to environmental temperature changes, effective correction of aberration, effective correction of chromatic aberration.

Table 7 is a table of related parameters of each lens of the wide-angle lens 3 in Figure 5.

The definition of the aspheric surface concavity z of the aspheric lens in Table 7 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 1 in the first embodiment, and will not be repeated here.

Table 8 is a table of related parameters of the aspheric surface of the aspheric lens in Table 7, where k is the Conic Constant and A~D are the aspheric coefficients.

Table 9 shows the relevant parameter values of the wide-angle lens 3 of the third embodiment and the calculated values of the corresponding conditions (1) to (7). From Table 9, it can be seen that the wide-angle lens 3 of the third embodiment can all satisfy the conditions (1) to The requirement of condition (7).

In addition, the optical performance of the wide-angle lens 3 of the third embodiment can also meet the requirements.

It can be seen from FIG. 6A that the longitudinal aberration of the wide-angle lens 3 of the third embodiment is between -0.005 mm and 0.025 mm.

It can be seen from FIG. 6B that the field curvature of the wide-angle lens 3 of the third embodiment is between -0.01 mm and 0.03 mm.

It can be seen from FIG. 6C that the F-Theta distortion of the wide-angle lens 3 of the third embodiment is between -5% and 0%.

It is obvious that the longitudinal aberration, curvature of field, and F-Theta distortion of the wide-angle lens 3 of the third embodiment can be effectively corrected, thereby obtaining better optical performance.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone familiar with the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be subject to those defined by the attached patent scope.

1‧‧‧Wide-angle lens

L11‧‧‧First lens

L12‧‧‧Second lens

L13‧‧‧Third lens

L14‧‧‧Fourth lens

L15‧‧‧Fifth lens

ST1‧‧‧Aperture

L16‧‧‧Sixth lens

L17‧‧‧Seventh lens

L18‧‧‧Eighth lens

L19‧‧‧Ninth lens

OF1‧‧‧Filter

CG1‧‧‧Protection glass

IMA1‧‧‧imaging surface

OA1‧‧‧Optical axis

S11‧‧‧Object side of the first lens

S12‧‧‧The side of the first lens image

S13‧‧‧Second lens object side

S14‧‧‧Second lens image side

S15‧‧‧Third lens object side

S16‧‧‧Third lens image side

S17‧‧‧Fourth lens object side

S18‧‧‧Fourth lens image side

S19‧‧‧Fifth lens object side

S110‧‧‧Fifth lens image side

S111‧‧‧Aperture surface

S112‧‧‧Sixth lens object side

S113‧‧‧Sixth lens image side (7th lens object side)

S114‧‧‧Seventh lens image side

S115‧‧‧The eighth lens object side

S116‧‧‧Eighth lens image side

S117‧‧‧Object side of ninth lens

S118‧‧‧Ninth lens image side

S119‧‧‧The side of the filter object

S120‧‧‧Filter image side

S121‧‧‧Protect the side of the glass object

S122‧‧‧Protect the side of the glass image

Claims (10)

A wide-angle lens including: A first lens with negative refractive power, the first lens including a convex surface facing an object side and a concave surface facing an image side; A second lens with negative refractive power, the second lens including a convex surface facing the object side and a concave surface facing the image side; A third lens having negative refractive power, the third lens including a concave surface facing the object side and another concave surface facing the image side; A fourth lens having positive refractive power, the fourth lens including a convex surface facing the object side and another convex surface facing the image side; A fifth lens with positive refractive power, the fifth lens including a convex surface facing the object side and another convex surface facing the image side; A sixth lens having positive refractive power, and the sixth lens includes a convex surface facing the image side; A seventh lens having negative refractive power, and the seventh lens includes a concave surface facing the object side; An eighth lens having positive refractive power, the eighth lens including a convex surface facing the object side; and A ninth lens with positive refractive power, the ninth lens including a concave surface facing the object side and 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 along an optical axis Arrange in order from the object side to the image side. The wide-angle lens described in item 1 of the scope of patent application further includes an aperture set between the fifth lens and the sixth lens, and the sixth lens is cemented with the seventh lens. The wide-angle lens as described in item 1 of the scope of patent application, in which: The sixth lens further includes another convex surface facing the object side; The seventh lens further includes another concave surface facing the image side; and The eighth lens further includes another convex surface facing the image side. For the wide-angle lens described in any one of claims 1 to 3 in the scope of the patent application, the wide-angle lens satisfies the following conditions: |DT|

5%; Among them, DT is the F-Theta distortion of one of the wide-angle lenses. For the wide-angle lens described in any one of claims 1 to 3 in the scope of the patent application, the wide-angle lens satisfies the following conditions: |P _V-IR |<8μm; Wherein, P _{V-IR is} the difference between the position of the clearest imaging surface of the center of the wide-angle lens in visible light and the position of the clearest imaging surface of the center of the wide-angle lens in infrared light. For the wide-angle lens described in any one of claims 1 to 3 in the scope of the patent application, the wide-angle lens satisfies the following conditions: 3.3mm<BFL<4mm; Wherein, BFL is a distance from an image side surface of the ninth lens to an image surface and the optical axis. For the wide-angle lens described in any one of claims 1 to 3 in the scope of the patent application, the wide-angle lens satisfies the following conditions: -0.7mm ^-1

1/(Nd ₁ ×f ₁ )+1/(Nd ₂ ×f ₂ )+1/(Nd ₃ ×f ₃ )+1/(Nd ₄ ×f ₄ )+1/(Nd ₅ ×f ₅ )+ 1/(Nd ₆ ×f ₆ )+1/(Nd ₇ ×f ₇ )+1/(Nd ₈ ×f ₈ )+1/(Nd ₉ ×f ₉ )

0.7mm ^-1 ; Wherein, Nd _{1 is a} refractive index of the first lens, Nd _{2 is a} refractive index of the second lens, Nd _{3 is a} refractive index of the third lens, and Nd _{4 is a} refractive index of the fourth lens. Nd _{5 is a} refractive index of the fifth lens, Nd _{6 is a} refractive index of the sixth lens, Nd _{7 is a} refractive index of the seventh lens, Nd _{8 is a} refractive index of the eighth lens, Nd ₉ Is a refractive index of the ninth lens, f _{1 is} an effective focal length of the first lens, f _{2 is} an effective focal length of the second lens, f _{3 is an effective focal length of the third lens, and f 4 is} an effective focal length of the third lens. An effective focal length of the fourth lens, f _{5 is} an effective focal length of the fifth lens, f _{6 is} an effective focal length of the sixth lens, f _{7 is} an effective focal length of the seventh lens, and f _{8 is} the eighth lens. One of the effective focal lengths of the lens, f _{9 is} one of the effective focal lengths of the ninth lens. For the wide-angle lens described in any one of claims 1 to 3 in the scope of the patent application, the wide-angle lens satisfies the following conditions: 1.5<TTL/D ₁ <2; Wherein, TTL is a distance from an object side of the first lens to an imaging surface on the optical axis, and D _{1 is} an optical effective diameter of the first lens. For the wide-angle lens described in any one of claims 1 to 3 in the scope of the patent application, the wide-angle lens satisfies the following conditions: 50

Vd ₆ -Vd ₇

70; Wherein, Vd _{6 is} one of the Abbe coefficients of the sixth lens, and Vd _{7 is} one of the Abbe coefficients of the seventh lens. For the wide-angle lens described in any one of claims 1 to 3 in the scope of the patent application, the wide-angle lens satisfies the following conditions: 135 degrees/mm<FOV/f<170 degrees/mm; Wherein, FOV is a full field of view of the wide-angle lens, and f is an effective focal length of the wide-angle lens.

Images