TWI759021B - Lens assembly - Google Patents

Abstract

A 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 refractive power and includes a convex surface facing an object side. The second lens is with positive refractive power. The third lens is with negative refractive power. The fourth lens is with positive refractive power. The fifth lens is with positive refractive power. The sixth lens is with positive refractive power. The seventh lens is with negative refractive power. The eighth lens is with refractive power and includes a convex surface facing an image side. The ninth lens is with refractive power and includes a convex surface facing the object side. The first lens, the second len, 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.

Description

Imaging Lens(52)

The present invention relates to an imaging lens.

The development trend of today's imaging lenses, in addition to the continuous development of miniaturization, with different application requirements, also need to have the ability of small field of view, large aperture and high resolution, conventional imaging lenses can no longer meet today's needs. , An imaging lens with a new architecture is required to meet the requirements of miniaturization, small field of view, large aperture and high resolution at the same time.

In view of this, the main purpose of the present invention is to provide an imaging lens, which has a short overall lens length, a small field of view, a small aperture value, and a high resolution, but still has good optical performance.

The present invention provides an imaging lens comprising 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 lens. The first lens has refractive power and includes a convex surface facing an object side. The second lens has positive refractive power. The third lens has negative refractive power. The fourth lens has positive refractive power. The fifth lens has positive refractive power. The sixth lens has positive refractive power. The seventh lens has negative refractive power. The eighth lens has refractive power and includes a convex surface facing an image side. The ninth lens has refractive power and includes a convex surface facing the object side. First lens, second lens, third lens, fourth lens, fifth lens The mirror, the sixth lens, the seventh lens, the eighth lens and the ninth lens are sequentially arranged along an optical axis from the object side to the image side.

The first lens has negative refractive power, the eighth lens has positive refractive power, and the ninth lens has positive refractive power.

The first lens is a meniscus lens, and may further include a concave surface facing the image side, the eighth lens is a biconvex lens, and may further include another convex surface facing the object side, and the ninth lens is a biconvex lens, and may further include another A convex surface faces the image side.

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 is a double concave lens, and includes a concave surface facing the object side and another concave surface facing the image side.

The fourth lens is a biconvex lens and includes one convex surface facing the object side and another convex surface facing the image side, and the fifth lens is a biconvex lens and includes one convex surface facing the object side and another convex surface facing the image side.

The sixth lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side.

The seventh lens is a biconcave lens, and includes a concave surface facing the object side and another concave surface facing the image side.

The imaging lens of the present invention may further include a diaphragm disposed between the fourth lens element and the fifth lens element.

TTL/f

3.8；2.7

TTL/R₁₁

3.0；0.65

f/f₅

0.8；1.15

f₃₄/f₆₇

1.80；Vd₂<30；Vd₄>35； 其中，TTL為第一透鏡之一物側面至一成像面於光軸上之一間距，f為成像鏡頭之一有效焦距，R₁₁為第一透鏡之一物側面之一曲率半徑，f₅為第五透鏡之一有效焦距，f₃₄為第三透鏡及第四透鏡之一組合有效焦距，f₆₇為第六透鏡及第七透鏡之一組合有效焦距，Vd₂為第二透鏡之一阿貝係數，Vd₄為第四透鏡之一阿貝係數。 The imaging lens meets at least one of the following conditions: 3.0

TTL/f

3.8; 2.7

TTL/R ₁₁

3.0; 0.65

f/f ₅

0.8; 1.15

_f34 / _f67

1.80; Vd ₂ <30; Vd ₄ >35; wherein, TTL is the distance between the object side of the first lens and an imaging surface on the optical axis, f is an effective focal length of the imaging lens, and R ₁₁ is the first lens A curvature radius of an object side surface, f ₅ is an effective focal length of the fifth lens, f ₃₄ is a combined effective focal length of the third lens and the fourth lens, f ₆₇ is a combination of the sixth lens and the seventh lens effective focal length Focal length, Vd ₂ is the Abbe coefficient of one of the second lenses, and Vd ₄ is the Abbe coefficient of one of the fourth lenses.

In order to make the above objects, features, and advantages of the present invention more clearly understood, preferred embodiments are given below and described in detail with the accompanying drawings.

1, 2, 3: Imaging lens

L11, L21, L31: The first lens

L12, L22, L32: Second lens

L13, L23, L33: Third lens

L14, L24, L34: Fourth lens

ST1, ST2, ST3: Aperture

L15, L25, L35: Fifth lens

L16, L26, L36: Sixth lens

L17, L27, L37: Seventh lens

L18, L28, L38: Eighth lens

L19, L29, L39: ninth lens

OF1, OF2, OF3: Filters

CG1, CG2, CG3: Protective glass

IMA1, IMA2, IMA3: Imaging plane

OA1, OA2, OA3: Optical axis

S11, S21, S31: the object side of the first lens

S12, S22, S32: the image side of the first lens

S13, S23, S33: the object side of the second lens

S14, S24, S34: second lens image side

S15, S25, S35: the object side of the third lens

S16, S26, S36: third lens image side

S17, S27, S37: the object side of the fourth lens

S18, S28, S38: image side of the fourth lens

S19, S29, S39: Aperture surface

S110, S210, S310: the object side of the fifth lens

S111, S211, S311: Image side of the fifth lens

S112, S212, S312: the object side of the sixth lens

S113, S213, S313: image side of sixth lens

S114, S214, S314: the object side of the seventh lens

S115, S215, S315: image side of the seventh lens

S116, S216, S316: the object side of the eighth lens

S117, S217, S317: image side of the eighth lens

S118, S218, S318: the object side of the ninth lens

S119, S219, S319: image side of the ninth lens

S120, S220, S320: side of filter object

S121, S221, S321: Filter image side

S122, S222, S322: Protect the side of the glass

S123, S223, S323: Protective glass image side

FIG. 1 is a schematic diagram of a lens configuration of a first embodiment of an imaging lens according to the present invention.

FIG. 2A is a longitudinal aberration (Longitudinal Aberration) diagram of the first embodiment of the imaging lens according to the present invention.

FIG. 2B is a field curvature diagram of the first embodiment of the imaging lens according to the present invention.

FIG. 2C is a distortion diagram of the first embodiment of the imaging lens according to the present invention.

Figure 2D is a lateral chromatic aberration (Lateral Color) diagram of the first embodiment of the imaging lens according to the present invention.

FIG. 2E is a Modulation Transfer Function diagram of the first embodiment of the imaging lens according to the present invention.

FIG. 3 is a schematic diagram of the lens configuration of the second embodiment of the imaging lens according to the present invention.

FIG. 4A is a longitudinal aberration diagram of the second embodiment of the imaging lens according to the present invention.

FIG. 4B is a field curvature diagram of the second embodiment of the imaging lens according to the present invention.

FIG. 4C is a distortion diagram of the second embodiment of the imaging lens according to the present invention.

FIG. 4D is a lateral chromatic aberration diagram of the second embodiment of the imaging lens according to the present invention.

FIG. 4E is a modulation transfer function diagram of the second embodiment of the imaging lens according to the present invention.

FIG. 5 is a schematic diagram of a lens configuration of a third embodiment of an imaging lens according to the present invention.

FIG. 6A is a longitudinal aberration diagram of a third embodiment of the imaging lens according to the present invention.

FIG. 6B is a field curvature diagram of the third embodiment of the imaging lens according to the present invention.

FIG. 6C is a distortion diagram of a third embodiment of the imaging lens according to the present invention.

FIG. 6D is a lateral chromatic aberration diagram of the third embodiment of the imaging lens according to the present invention.

FIG. 6E is a modulation transfer function diagram of the third embodiment of the imaging lens according to the present invention.

The invention provides an imaging lens, comprising: a first lens with refractive power, the first lens includes a convex surface facing an object side; a second lens with positive refractive power; a third lens with negative refractive power; a fourth lens with positive refractive power refractive power; a fifth lens has positive refractive power; a sixth lens has positive refractive power; a seventh lens has negative refractive power; an eighth lens has refractive power, the eighth lens includes a convex surface facing an image side; and a ninth lens With refractive power, the ninth lens includes a convex surface facing the object 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 They are arranged in sequence from the object side to the image side along an optical axis.

Please refer to Table 1, Table 3 and Table 5 below, wherein Table 1, Table 3 and Table 5 are the relevant parameter tables of each lens of the first embodiment to the third embodiment of the imaging lens according to the present invention, respectively.

Figures 1, 3, and 5 are the first, second, and third examples of the imaging lens of the present invention, respectively. The schematic diagram of the lens configuration of the embodiment, wherein the first lenses L11, L21, L31 are meniscus lenses with negative refractive power, made of glass material, the object sides S11, S21, S31 are convex, and the image sides S12, S22, S32 are Concave, the object sides S11, S21, S31 and the image sides S12, S22, S32 are all spherical surfaces.

The second lenses L12, L22 and L32 are meniscus lenses with positive refractive power and are made of glass material. S33 and the image side surfaces S14, S24, and S34 are all spherical surfaces.

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

The fourth lenses L14, L24, L34 are biconvex lenses with positive refractive power, made of glass material, the object sides S17, S27, S37 are convex, the image sides S18, S28, S38 are convex, and the object sides S17, S27, S37 and Like the side surfaces S18, S28, S38 are spherical surfaces.

The fifth lens L15, L25 and L35 are biconvex lenses with positive refractive power and are made of glass material. The image sides S111, S211, and S311 are all spherical surfaces.

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

The seventh lenses L17, L27, and L37 are biconcave lenses with negative refractive power, which are composed of glass Made of glass material, the object sides S114, S214, S314 are concave, the image sides S115, S215, S315 are concave, and the object sides S114, S214, S314 and the image sides S115, S215, S315 are spherical surfaces.

The eighth lenses L18, L28, and L38 are biconvex lenses with positive refractive power and are made of glass material. The object sides S116, S216, and S316 are convex, the image sides S117, S217, and S317 are convex, and the object sides S116, S216, and S316 are convex. The image sides S117, S217, and S317 are all spherical surfaces.

The ninth lenses L19, L29, and L39 are biconvex lenses with positive refractive power and are made of glass material. The side surfaces S119, S219, and S319 are all spherical surfaces.

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

Vd ₂ <30; (5)

Vd ₄ >35; (6)

Among them, TTL is the first embodiment to the third embodiment, the side surfaces S11, S21, S31 of the first lenses L11, L21, L31 to the imaging planes IMA1, IMA2, IMA3 on the optical axes OA1, OA2, OA3, respectively A distance, f is an effective focal length of the imaging lenses 1, 2, ₃ in the first to third embodiments, f5 is the fifth lens L15, L25, L35 in the first to third embodiments One effective focal length, f ₃₄ is the effective focal length of the first embodiment to the third embodiment, the third lens L13, L23, L33 and one of the fourth lenses L14, L24, L34 respectively combined effective focal length, f ₆₇ is the first embodiment In the third embodiment, the sixth lenses L16, L26, L36 are respectively combined with one of the seventh lenses L17, L27, _L37 to have an effective focal length, and R11 is the first to third embodiments. One of the curvature radius of the side surfaces S11, S21, S31 of the objects L21 and L31, Vd ₂ is the Abbe coefficient of the second lens L12, L22, L32 in the first to third embodiments, and Vd ₄ is the first embodiment In the example to the third embodiment, the Abbe coefficient of the fourth lens L14, L24, L34 is one. The imaging lenses 1, 2, and 3 can effectively shorten the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, effectively correct the aberration, and effectively correct the chromatic aberration.

The first embodiment of the imaging lens of the present invention will now be described in detail. Referring to FIG. 1, the imaging lens 1 includes a first lens L11, a second lens L12, a third lens L13, a fourth lens L14, An aperture ST1, a fifth lens L15, a sixth lens L16, a seventh lens L17, an eighth lens L18, a ninth lens L19, a filter OF1 and a protective glass CG1. During imaging, the light from the object side is finally imaged on an imaging plane IMA1. According to the first to eleventh paragraphs of [Embodiment], wherein:

The object side S120 and the image side S121 of the filter OF1 are both flat; the object side S122 and the image side S123 of the protective glass CG1 are both flat;

Using the above-mentioned lens, aperture ST1 and the design that satisfies at least one of the conditions (1) to (6), the imaging lens 1 can effectively shorten the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, and effectively Correction of aberration, effective correction of chromatic aberration.

Table 1 is a table of relevant parameters of each lens of the imaging lens 1 in the first figure.

Table 2 shows the relevant parameter values of the imaging lens 1 of the first embodiment and the calculated values of the corresponding conditions (1) to (6). It can be seen from Table 2 that the imaging lens 1 of the first embodiment can meet the conditions (1). ) to the requirements of condition (6).

In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirements. It can be seen from FIG. 2A that the longitudinal aberration of the imaging lens 1 of the first embodiment is between -0.01 mm and 0.03 mm. between mm. It can be seen from FIG. 2B that the field curvature of the imaging lens 1 of the first embodiment is between -0.02 mm and 0.03 mm. It can be seen from FIG. 2C that the distortion of the imaging lens 1 of the first embodiment is between -8% and 0%. It can be seen from FIG. 2D that the lateral chromatic aberration of the imaging lens 1 of the first embodiment is between -0.5 μm and 2.5 μm. It can be seen from FIG. 2E that the modulation transfer function value of the imaging lens 1 of the first embodiment is between 0.52 and 1.0.

It is obvious that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the imaging lens 1 of the first embodiment can be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 3, the imaging lens 2 includes a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, An aperture ST2, a fifth lens L25, a sixth lens L26, a seventh lens L27, an eighth lens L28, a ninth lens L29, a filter OF2 and a protective glass CG2. During imaging, the light from the object side is finally imaged on an imaging plane IMA2. According to the first to eleventh paragraphs of [Embodiment], wherein:

The object side S220 and the image side S221 of the filter OF2 are both flat; the object side S222 and the image side S223 of the protective glass CG2 are both flat;

Using the above-mentioned lens, aperture ST2 and the design that satisfies at least one of the conditions (1) to (6), the imaging lens 2 can effectively shorten the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, and effectively Correction of aberration, effective correction of chromatic aberration.

Table 3 is a table of relevant parameters of each lens of the imaging lens 2 in Figure 3.

Table 4 shows the relevant parameter values of the imaging lens 2 of the second embodiment and the calculated values of the corresponding conditions (1) to (6). It can be seen from Table 4 that the imaging lens 2 of the second embodiment can meet the conditions (1). ) to the requirements of condition (6).

In addition, the optical performance of the imaging lens 2 of the second embodiment can also meet the requirements. It can be seen from FIG. 4A that the longitudinal aberration of the imaging lens 2 of the second embodiment is between -0.02 mm and 0.03 mm. It can be seen from Fig. 4B that the field curvature of the imaging lens 2 of the second embodiment is between -0.02mm to 0.03mm. It can be seen from FIG. 4C that the distortion of the imaging lens 2 of the second embodiment is between -6% and 0%. It can be seen from FIG. 4D that the lateral chromatic aberration of the imaging lens 2 of the second embodiment is between 0 μm and 3.0 μm. It can be seen from FIG. 4E that the modulation transfer function value of the imaging lens 2 of the second embodiment is between 0.56 and 1.0. .

It is obvious that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the imaging lens 2 of the second embodiment can be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 5, the imaging lens 3 includes a first lens L31, a second lens L32, a third lens L33, a fourth lens L34, An aperture ST3, a fifth lens L35, a sixth lens L36, a seventh lens L37, an eighth lens L38, a ninth lens L39, a filter OF3 and a protective glass CG3. During imaging, the light from the object side is finally imaged on an imaging plane IMA3. According to the first to eleventh paragraphs of [Embodiment], wherein:

The object side S320 and the image side S321 of the filter OF3 are both flat; the object side S322 and the image side S323 of the protective glass CG3 are both flat;

Using the above-mentioned lens, aperture ST3 and the design that satisfies at least one of the conditions (1) to (6), the imaging lens 3 can effectively shorten the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, and effectively Correction of aberration, effective correction of chromatic aberration.

Table 5 is a table of relevant parameters of each lens of the imaging lens 3 in Fig. 5 .

Table 6 shows the relevant parameter values of the imaging lens 3 of the third embodiment and the calculated values of the corresponding conditions (1) to (6). It can be seen from Table 6 that the imaging lens 3 of the third embodiment can meet the conditions (1). ) to the requirements of condition (6).

In addition, the optical performance of the imaging lens 3 of the third embodiment can also meet the requirements. It can be seen from FIG. 6A that the longitudinal aberration of the imaging lens 3 of the third embodiment is between -0.01 mm and 0.03 mm. It can be seen from FIG. 6B that the field curvature of the imaging lens 3 of the third embodiment is between -0.02 mm and 0.04 mm. It can be seen from FIG. 6C that the distortion of the imaging lens 3 of the third embodiment is between -6% and 0%. It can be seen from Fig. 6D that the lateral chromatic aberration of the imaging lens 3 of the third embodiment is between 0 μm and 2.5 μm. It can be seen from FIG. 6E that the modulation transfer function value of the imaging lens 3 of the third embodiment is between 0.59 and 1.0.

It is obvious that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the imaging lens 3 of the third embodiment can be effectively corrected, and the resolution of the lens can also meet the requirements, 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 who is 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 determined by the scope of the appended patent application.

1: Imaging lens

L11: The first lens

L12: Second lens

L13: Third lens

L14: Fourth lens

ST1: Aperture

L15: Fifth lens

L16: Sixth lens

L17: Seventh lens

L18: Eighth lens

L19: ninth lens

OF1: filter

CG1: Protective glass

IMA1: Imaging plane

OA1: Optical axis

S11: Object side of the first lens

S12: The first lens image side

S13: Object side of the second lens

S14: The second lens is like the side

S15: Object side of the third lens

S16: The third lens is like the side

S17: Fourth lens object side

S18: Fourth lens like side

S19: Aperture Surface

S110: Object side of fifth lens

S111: Fifth lens image side

S112: Object side of sixth lens

S113: The sixth lens image side

S114: Seventh lens object side

S115: The seventh lens image side

S116: Object side of the eighth lens

S117: The eighth lens image side

S118: The object side of the ninth lens

S119: Ninth lens image side

S120: Side of filter object

S121: Filter like side

S122: Protect the side of glass

S123: Protective glass like side

Claims (10)

An imaging lens, comprising: a first lens with refractive power, the first lens including a convex surface facing an object side; a second lens with positive refractive power; a third lens with negative refractive power; a fourth lens with positive refractive power; The fifth lens has positive refractive power; the sixth lens has positive refractive power; the seventh lens has negative refractive power; the eighth lens has refractive power, and the eighth lens includes a convex surface facing the object side and another convex surface facing an image side; And a ninth lens with refractive power, the ninth lens includes a convex surface facing the object side and another convex surface facing the image side; wherein the first lens, the second lens, the third lens, the fourth lens, the The fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are sequentially arranged along an optical axis from the object side to the image side. The imaging lens of claim 1, wherein: the first lens has a negative refractive power; the eighth lens has a positive refractive power; and the ninth lens has a positive refractive power. The imaging lens of claim 2, wherein: the first lens is a meniscus lens, and further includes a concave surface facing the image side. The imaging lens of claim 1, wherein 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 imaging lens of claim 1, wherein the third lens is a biconcave lens, and includes a concave surface facing the object side and another concave surface facing the image side. The imaging lens of claim 1, wherein: the fourth lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side; and the fifth lens is a biconvex lens, and It includes a convex surface facing the object side and another convex surface facing the image side. The imaging lens of claim 1, wherein the sixth lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side. The imaging lens of claim 1, wherein the seventh lens is a biconcave lens, and includes a concave surface facing the object side and another concave surface facing the image side. The imaging lens of claim 1, further comprising an aperture disposed between the fourth lens and the fifth lens. The imaging lens according to any one of claims 1 to 9 in the scope of the application, wherein the imaging lens satisfies at least one of the following conditions: 3.0

TTL/f

3.8; 2.7

TTL/R ₁₁

3.0; 0.65

f/f ₅

0.8; 1.15

_f34 / _f67

1.80; Vd ₂ <30; Vd ₄ >35; wherein, TTL is a distance from an object side of the first lens to an imaging plane on the optical axis, f is an effective focal length of the imaging lens, and R ₁₁ is A curvature radius of an object side surface of the first lens, f5 is an effective focal length of the _fifth lens, _f34 is a combined effective focal length of the third lens and the fourth lens, _f67 is the sixth lens and a combined effective focal length of the seventh lens, Vd ₂ is an Abbe coefficient of the second lens, and Vd ₄ is an Abbe coefficient of the fourth lens.

Images