TWI736462B - Lens assembly - Google Patents

Abstract

A lens assembly includes a first lens, a second lens, a third lens, a stop, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens includes a convex surface facing an object side and a concave surface facing an image side. The second lens is with negative refractive power. The third lens is with positive refractive power and includes a convex surface facing the image side. The fourth lens includes a convex surface facing the image side. The fifth lens is with positive refractive power and includes a convex surface facing the object side. The sixth lens is a biconcave lens. The seventh lens includes a convex surface facing the image side. The first lens, the second lens, the third lens, the stop, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are arranged in order from the object side to the image side along an optical axis. The lens assembly satisfies: 4.3

TTL/BFL

Description

Imaging lens (48)

The invention relates to an imaging lens.

The development trend of today’s imaging lenses, in addition to constantly moving towards large apertures, high resolution, and resistance to environmental temperature changes, it also needs to have the characteristics of day and night confocal, whether it is day or night, it can capture clear images, in order to meet both day and night For image quality requirements, conventional imaging lenses can no longer meet today's needs, and a new imaging lens with a new architecture is needed to simultaneously meet the requirements of large aperture, high resolution, resistance to environmental temperature changes, and day and night co-focus.

In view of this, the main purpose of the present invention is to provide an imaging lens with a small aperture value, high resolution, resistance to environmental temperature changes, day and night confocal, but still has good optical performance.

TTL/BFL

5.3；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，BFL為第七透鏡之一像側面至成像面於光軸上之一間距。 The invention provides an imaging lens including a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens is a meniscus lens with 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. The third lens has positive refractive power and includes a convex surface facing the image side. The fourth lens has refractive power and includes a convex surface facing the image side. The fifth lens has positive refractive power and includes a convex surface facing the object side. The sixth lens is a biconcave lens with negative refractive power and includes a concave surface facing the object side and another concave surface facing the image side. The seventh lens has refractive power and includes a convex surface facing the image side. The first lens, the second lens, the third lens, the aperture, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in order from the object side to the image side along an optical axis. The imaging lens meets the following conditions: 4.3

TTL/BFL

5.3; where TTL is a distance from an object side of the first lens to an imaging surface on the optical axis, and BFL is a distance from an image side of the seventh lens to the imaging surface on the optical axis.

(R₄₁+R₄₂)/(R₄₁-R₄₂)

0；其中，R₄₁為第四透鏡之一物側面之一曲率半徑，R₄₂為第四透鏡之一像側面之一曲率半徑。 The present invention provides another imaging lens including a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens is a meniscus lens with 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 concave surface facing the image side. The third lens has positive refractive power and includes a convex surface facing the image side. The fourth lens has refractive power and includes a convex surface facing the image side. The fifth lens has positive refractive power and includes a convex surface facing the object side. The sixth lens is a biconcave lens with negative refractive power, and includes a concave surface facing the object side and another concave surface facing the image side. The seventh lens has refractive power and includes a convex surface facing the image side. The first lens, the second lens, the third lens, the aperture, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in order from the object side to the image side along an optical axis. The imaging lens meets the following conditions: -1

(R ₄₁ +R ₄₂ )/(R ₄₁ -R ₄₂ )

0; where R ₄₁ is a radius of curvature of an object side surface of the _{fourth lens, and R 42} is a radius of curvature of an image side surface of the fourth lens.

The first lens has negative refractive power, the fourth lens has positive refractive power, and may further include another convex surface facing the object side, the fifth lens may further include another convex surface facing the image side, and the seventh lens may have positive refractive power, and may further include The other convex surface faces the object side.

The second lens includes a concave surface facing the object side.

The second lens includes a convex surface facing the object side.

The third lens may further include another convex surface facing the object side.

The third lens includes a concave surface facing the object side.

The fifth lens and the sixth lens are cemented together.

The seventh lens is an aspheric lens.

TTL/f

11.5；-3.5

f₁/f

-2.4；3

f₃/f

6；2.5

f₇/f

5.2；17.4

f+f₃

23.8；其中，TTL為第一透鏡之物側面至成像面於光軸上之間距，f為成像鏡頭之一有效焦距，f₁為第一透鏡之一有效焦距，f₃為第三透鏡之一有效焦距，f₇為第七透鏡之一有效焦距。 The imaging lens meets any of the following conditions: 8.5

TTL/f

11.5; -3.5

f ₁ /f

-2.4; 3

f ₃ /f

6; 2.5

f ₇ /f

5.2; 17.4

f+f ₃

23.8; where TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, f is an effective focal length of the imaging lens, f ₁ is an effective focal length of the first lens, and f ₃ is one of the third lens Effective focal length, f ₇ is one of the effective focal lengths of the seventh lens.

In order to make the above-mentioned objectives, 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, 4: imaging lens

LG11, LG21, LG31, LG41: the first lens group

ST1, ST2, ST3, ST4: Aperture

LG12, LG22, LG32, LG42: second lens group

L11, L21, L31, L41: the 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

OF1, OF2, OF3, OF4: filter

CG1, CG2, CG3, CG4: protective glass

IMA1, IMA2, IMA3, IMA4: imaging surface

OA1, OA2, OA3, OA4: Optical axis

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

S12, S22, S32, S42: the side of the first lens image

S13, S23, S33, S43: the object side of the second lens

S14, S24, S34, S44: the side of the second lens image

S15, S25, S35, S45: third lens object side

S16, S26, S36, S46: third lens image side

S17, S27, S37, S47: aperture surface

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

S19, S29, S39, S49: the side of the fourth lens image

S110, S210, S310, S410: fifth lens object side

S111, S211, S311, S411: the side of the fifth lens image

S112, S212, S312, S412: sixth lens object side

S113, S213, S313, S413: the side of the sixth lens image

S114, S214, S314, S414: seventh lens object side

S115, S215, S315, S415: Side view of the seventh lens

S116, S216, S316, S416: side of the filter object

S117, S217, S317, S417: Filter image side

S118, S218, S318, S418: Protect the side of the glass object

S119, S219, S319, S419: Protect the side of the glass image

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

Figure 2A is a Field Curvature diagram of the first embodiment of the imaging lens according to the present invention.

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

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

The 2D diagram is a diagram of a Through Focus Modulation Transfer Function (Through Focus Modulation Transfer Function) of the first embodiment of the imaging 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 imaging lens according to the present invention.

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

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

Fig. 4C is a light spot diagram of the second embodiment of the imaging lens according to the present invention.

Fig. 4D is a diagram of the defocus modulation transfer function of the second embodiment of the imaging lens according to the present invention.

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

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

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

Fig. 6C is a light spot diagram of the third embodiment of the imaging lens according to the present invention.

Fig. 6D is a diagram of the defocus modulation transfer function of the third embodiment of the imaging lens according to the present invention.

FIG. 7 is a schematic diagram of the lens configuration and optical path of the fourth embodiment of the imaging lens according to the present invention.

Fig. 8A is a field curvature diagram of the fourth embodiment of the imaging lens according to the present invention.

FIG. 8B is a distortion diagram of the fourth embodiment of the imaging lens according to the present invention.

Fig. 8C is a light spot diagram of the fourth embodiment of the imaging lens according to the present invention.

Fig. 8D is a graph of the defocus modulation transfer function of the fourth embodiment of the imaging lens according to the present invention.

TTL/BFL

5.3；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，BFL為第七透鏡之一像側面至成像面於光軸上之一間距。 The present invention provides an imaging lens including: a first lens is a meniscus lens with refractive power, and includes a convex surface facing an object side and a concave surface facing an image side; a second lens having negative refractive power; a third lens having Positive refractive power, the third lens includes a convex surface facing the image side; an aperture; a fourth lens with refractive power, the fourth lens includes a convex surface facing the image side; a fifth lens with positive refractive power, the fifth lens includes a convex surface Towards the object side; a sixth lens is a biconcave lens with negative refractive power, and includes a concave surface facing the object side and another concave surface facing the image side; a seventh lens has refractive power, the seventh lens includes a convex surface facing the image side; A lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens, and a seventh lens are arranged in order from the object side to the image side along an optical axis; the imaging lens meets the following conditions: 4.3

TTL/BFL

5.3; Wherein, TTL is a distance from an object side of the first lens to an imaging surface on the optical axis, and BFL is a distance from an image side of the seventh lens to the imaging surface on the optical axis.

(R₄₁+R₄₂)/(R₄₁-R₄₂)

0；其中，R₄₁為第四透鏡之一物側面之一曲率半徑，R₄₂為第四透鏡之一像側面之一曲率半徑。 The present invention provides another imaging lens, including: a first lens is a meniscus lens with refractive power, and includes a convex surface facing an object side and a concave surface facing an image side; a second lens having a negative refractive power; a third lens With positive refractive power, the third lens includes a convex surface facing the image side; an aperture; a fourth lens with refractive power, the fourth lens includes a convex surface facing the image side; a fifth lens with positive refractive power, the fifth lens includes a The convex surface faces the object side; a sixth lens is a biconcave lens with negative refractive power, and includes a concave surface facing the object side and the other concave surface facing the image side; a seventh lens has refractive power, and the seventh lens includes a convex surface facing the image side; The first lens, the second lens, the third lens, the aperture, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in order from the object side to the image side along an optical axis; the imaging lens meets the following conditions :-1

(R ₄₁ +R ₄₂ )/(R ₄₁ -R ₄₂ )

0; where R ₄₁ is a radius of curvature of an object side surface of the _{fourth lens, and R 42} is a radius of curvature of an image side surface of the fourth lens.

Please refer to Table 1, Table 2, Table 4, Table 5, Table 7, Table 8, Table 10, and Table 11 at the bottom. Table 1, Table 4, Table 7 and Table 10 are respectively the first imaging lens according to the present invention. The related parameter table of each lens of the first embodiment to the fourth embodiment, Table 2, Table 5, Table 8 and Table 11 are the aspheric surface of the aspheric lens in Table 1, Table 4, Table 7 and Table 10, respectively Related parameter table.

Figures 1, 3, 5, and 7 are respectively schematic diagrams of the lens configuration and optical path of the first, second, third, and fourth embodiments of the imaging lens of the present invention, where the first lens group LG11 includes a first lens L11 and a second lens L12 The third lens L13, the second lens group LG12 includes a fourth lens L14, a fifth lens L15, a sixth lens L16, and a seventh lens L17; the first lens group LG21 includes a first lens L21, a second lens L22, and a third lens. The second lens group LG22 includes a fourth lens L24, a fifth lens L25, a sixth lens L26, and a seventh lens L27; the first lens group LG31 includes a first lens L31, a second lens L32, and a third lens L33, The second lens group LG32 includes a fourth lens L34, a fifth lens L35, a sixth lens L36, and a seventh lens L37; the first lens group LG41 includes a first lens L41, a second lens L42, a third lens L43, and a second lens The group LG42 includes a fourth lens L44, a fifth lens L45, a sixth lens L46, and a seventh lens L47.

The first lenses L11, L21, L31, and L41 are meniscus lenses with negative refractive power and are made of glass. The object side surfaces S11, S21, S31, and S41 are convex surfaces, and the image side surfaces S12, S22, S32, and S42 are concave surfaces. The object side surfaces S11, S21, S31, S41 and the image side surfaces S12, S22, S32, S42 are all spherical surfaces.

The second lenses L12, L22, L32, and L42 have negative refractive power and are made of glass material, and the image side surfaces S14, S24, S34, and S44 are concave.

The third lens L13, L23, L33, L43 has positive refractive power and is made of glass The image side surfaces S16, S26, S36, S46 are convex surfaces, and the object side surfaces S15, S25, S35, S45 and the image side surfaces S16, S26, S36, S46 are all spherical surfaces.

The fourth lenses L14, L24, L34, and L44 are biconvex lenses with positive refractive power and are made of glass. The object side surfaces S18, S28, S38, and S48 are convex surfaces, and the image side surfaces S19, S29, S39, and S49 are convex surfaces.

The fifth lens L15, L25, L35, L45 is a double convex lens with positive refractive power, made of glass material, its object side surface S110, S210, S310, S410 is convex surface, the image side surface S111, S211, S311, S411 is convex surface, the object side surface S110, S210, S310, S410 and the image side surface S111, S211, S311, S411 are all spherical surfaces.

The sixth lens L16, L26, L36, and L46 are biconcave lenses with negative refractive power and are made of glass. The object side surfaces S112, S212, S312, and S412 are concave surfaces, and the image side surfaces S113, S213, S313, and S413 are concave surfaces. S112, S212, S312, S412 and the image side surface S113, S213, S313, S413 are all spherical surfaces.

The seventh lens L17, L27, L37, and L47 are double convex lenses with positive refractive power and are made of glass. The object side surfaces S114, S214, S314, and S414 are convex surfaces, and the image side surfaces S115, S215, S315, and S415 are convex surfaces. S114, S214, S314, S414 and the image side surface S115, S215, S315, S415 are all aspherical surfaces.

The fifth lenses L15, L25, L35, and L45 are cemented with the sixth lenses L16, L26, L36, and L46, respectively.

In addition, the imaging lenses 1, 2, 3, and 4 meet at least one of the following conditions:

Among them, TTL is in the first embodiment to the fourth embodiment, the object sides S11, S21, S31, and S41 of the first lenses L11, L21, L31, L41 are respectively to the imaging planes IMA1, IMA2, IMA3, IMA4 on the optical axis OA1 , OA2, OA3, OA4, BFL is the first embodiment to the fourth embodiment, the seventh lens L17, L27, L37, L47 on the image side surface S115, S215, S315, S415 respectively to the imaging surface IMA1 IMA2, IMA3, IMA4 are at a pitch on the optical axis OA1, OA2, OA3, OA4, R ₄₁ is the object side S18, S28 of the fourth lens L14, L24, L34, L44 in the first to fourth embodiments , S38, S48, one of the radius of curvature, R ₄₂ is one of the curvature radius of the image side surface S19, S29, S39, S49 of the fourth lens L14, L24, L34, L44 in the first to fourth embodiments, f ₁ the first embodiment to the fourth embodiment, a first lens L11, L21, L31, L41, one effective focal length, f ₃ of the first embodiment to the fourth embodiment, the third lens L13, L23, L33, L43 is an effective focal length, f ₇ is the effective focal length of one of the seventh lenses L17, L27, L37, and L47 in the first to fourth embodiments, and f is the imaging lens in the first to fourth embodiments One of 1, 2, 3, 4 effective focal length. The imaging lens 1, 2, 3, 4 can effectively increase the field of view, effectively improve the resolution, effectively resist environmental temperature changes, effectively correct the day and night different focal points, effectively correct aberrations, and effectively correct chromatic aberrations.

TTL/BFL

5.3時，可有較長的後焦距，有助於成像鏡頭組裝。 When the condition (1) is met: 4.3

TTL/BFL

At 5.3, it can have a longer back focal length, which is helpful for the assembly of the imaging lens.

(R₄₁+R₄₂)/(R₄₁-R₄₂)

0時，可有效控制第四透鏡外型，使得後焦距變長。 When condition (2) is met: -1

(R ₄₁ +R ₄₂ )/(R ₄₁ -R ₄₂ )

At 0, the shape of the fourth lens can be effectively controlled to make the back focal length longer.

TTL/f

11.5時，可有效縮短成像鏡頭總長度。 When condition (3) is met: 8.5

TTL/f

At 11.5, the total length of the imaging lens can be effectively shortened.

f₁/f

-2.4時，可提供足夠強的負屈光力。 When condition (4) is met: -3.5

f ₁ /f

-2.4, can provide sufficient negative refractive power.

f₃/f

6時，可降低成像鏡頭中單一透鏡屈光力的強度，以避免透鏡之間屈光力差距過大而造成影像修正不足或過度修正等問題。 When condition (5) is met: 3

f ₃ /f

At 6 o'clock, the refractive power of a single lens in the imaging lens can be reduced to avoid problems such as insufficient or over-correction of the image due to the excessive difference in refractive power between the lenses.

f₇/f

5.2時，可提供足夠強的正屈光力。 When condition (6) is met: 2.5

f ₇ /f

At 5.2, it can provide sufficient positive refractive power.

f+f₃

23.8時，可使第三透鏡之屈光力不至於過高，有助於第三透鏡之加工。 When condition (7) is met: 17.4

f+f ₃

At 23.8, the refractive power of the third lens will not be too high, which is helpful for the processing of the third lens.

TTL/BFL

5.3及條件(2)：-1

(R₄₁+R₄₂)/(R₄₁-R₄₂)

0的共同功效為能達到較長的後焦距，使得機構件的設計可具有較大彈性，並有助於成像鏡頭組裝。 Condition (1): 4.3

TTL/BFL

5.3 and conditions (2): -1

(R ₄₁ +R ₄₂ )/(R ₄₁ -R ₄₂ )

The common effect of 0 is to achieve a longer back focal length, so that the design of the mechanical parts can have greater flexibility and facilitate the assembly of the imaging lens.

When the first lens is a meniscus lens, it can collect light to achieve the function of a large field of view; when the second lens is a meniscus lens, it can further assist the lack of light collection of the first lens; the third lens and the fourth lens Both have positive refractive power, which can balance the negative refractive power of the first lens and the second lens to correct aberrations; the fifth lens and the sixth lens are cemented to effectively eliminate axial and lateral chromatic aberration to improve the resolution of the imaging lens ; The seventh lens uses aspherical design to correct the angle of incidence of light, which can greatly correct the field curvature and distortion of the imaging lens; when the aperture is set to the third lens and the first lens Among the four lenses, various types of aberrations can be balanced, and the outer diameter of the first lens and the seventh lens can be reduced to reduce the outer diameter of the imaging lens.

The first embodiment of the imaging lens of the present invention will now be described in detail. Referring to Figure 1, the imaging lens 1 includes a first lens group LG11, an aperture ST1, a second lens group LG12, a filter OF1, and an optical axis OA1 from an object side to an image side in sequence. A protective glass CG1. The first lens group LG11 includes a first lens L11, a second lens L12, and a third lens L13 in order from the object side to the image side along the optical axis OA1. The second lens group LG12 extends from the object side along the optical axis OA1. The image side includes a fourth lens L14, a fifth lens L15, a sixth lens L16, and a seventh lens L17 in sequence. 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 Mode], in which:

The second lens L12 is a biconcave lens, the object side surface S13 is a concave surface, and the object side surface S13 and the image side surface S14 are both spherical surfaces;

The third lens L13 is a double convex lens, and its object side surface S15 is a convex surface;

For the fourth lens L14, the object side surface S18 and the image side surface S19 are both aspherical surfaces;

The object side S116 and the image side S117 of the filter OF1 are both flat surfaces;

The protective glass CG1 has a flat surface on the object side S118 and the image side S119;

Using the above-mentioned lens, aperture ST1, and a design that meets at least one of the conditions (1) to (7), the imaging lens 1 can effectively increase the field of view, effectively improve the resolution, effectively resist environmental temperature changes, and effectively Correct day and night different focus, effective correction of aberration, effective correction of chromatic aberration.

Table 1 is a table of related parameters of each lens of the imaging 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 +Eh ¹² +Fh ¹⁴

in:

c: curvature;

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

k: conic coefficient;

A~F: 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~F are the aspherical coefficients.

Table 3 shows the relevant parameter values of the imaging 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 imaging lens 1 of the first embodiment can all satisfy the condition (1). ) To the requirements of condition (7).

In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirements. It can be seen from Figure 2A that the curvature of field of the imaging lens 1 of the first embodiment is between -0.04 mm and 0.10 mm. It can be seen from Fig. 2B that the distortion of the imaging lens 1 of the first embodiment is between -35% and 0%. It can be seen from Figure 2C that, when the image height of the imaging lens 1 of the first embodiment is 0.000mm, the root mean square (Root Mean Square) radius of the light spot is 2.095μm, and the geometrical radius of the light spot When the image height is 1.087mm, the root mean square radius of the spot is 2.774µm, and the geometric radius of the spot is 13.436µm. When the image height is 1.811mm, the root mean square radius of the spot is 3.505μm, the geometric radius of the light spot is 16.808μm, when the image height When it is 2.898mm, the root mean square radius of the light spot is 4.586μm, and the geometric radius of the light spot is 21.158μm. When the image height is 3.623mm, the root mean square radius of the light spot is 5.873μm. The radius is 27.068μm. It can be seen from Fig. 2D that the imaging lens 1 of the first embodiment has a modulation transfer function value between 0.0 and 0.76 when the focus shift is between -0.05 mm and 0.05 mm.

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

Referring to FIG. 3, the imaging lens 2 includes a first lens group LG21, an aperture ST2, a second lens group LG22, a filter OF2, and an optical axis OA2 from an object side to an image side in sequence. A protective glass CG2. The first lens group LG21 includes a first lens L21, a second lens L22, and a third lens L23 in order from the object side to the image side along the optical axis OA2. The second lens group LG22 extends from the object side along the optical axis OA2. The image side includes a fourth lens L24, a fifth lens L25, a sixth lens L26, and a seventh lens L27 in sequence. 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 second lens L22 is a meniscus lens, the object side S23 is convex, and both the object side S23 and the image side S24 are aspherical surfaces;

The third lens L23 is a meniscus lens, and its object side surface S25 is concave;

For the fourth lens L24, both the object side surface S28 and the image side surface S29 are spherical surfaces;

The object side S216 and the image side S217 of the filter OF2 are both flat surfaces;

The protective glass CG2, the object side S218 and the image side S219 are both flat surfaces;

Using the above-mentioned lens, aperture ST2, and a design that meets at least one of the conditions (1) to (7), the imaging lens 2 can effectively increase the field of view, effectively improve the resolution, effectively resist environmental temperature changes, and effectively Correct day and night different focus, effective correction of aberration, effective Correction of chromatic aberration.

Table 4 is a table of related parameters of each lens of the imaging 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~F are the aspheric coefficients.

Table 6 shows the relevant parameter values of the imaging 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 imaging lens 2 of the second embodiment can all satisfy the condition (1). ) To the requirements of condition (7).

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 curvature of field of the imaging lens 2 of the second embodiment is between -0.04mm and 0.09mm. It can be seen from FIG. 4B that the distortion of the imaging lens 2 of the second embodiment is between -35% and 0%. It can be seen from Figure 4C that the imaging lens 2 of the second embodiment, when the image height is 0.000mm, the root mean square radius of the light spot is 2.321μm, the geometric radius of the light spot is 10.261μm, when the image height is When 1.087mm, the root mean square radius of the light spot is 2.836μm, the geometric radius of the light spot is 13.447μm, when the image height is 1.811mm, the root mean square radius of the light spot is 3.392μm, the geometric radius of the light spot When the image height is 2.898mm, the root mean square radius of the spot is 4.445µm, and the geometric radius of the spot is 19.343µm. When the image height is 3.623mm, the root mean square radius of the spot is 5.316μm, the geometric radius of the light spot is 22.795μm. It can be seen from FIG. 4D that the imaging lens 2 of the second embodiment has a modulation transfer function value between 0.0 and 0.75 when the focus shift is between -0.05 mm and 0.05 mm.

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

Referring to FIG. 5, the imaging lens 3 includes a first lens group LG31, an aperture ST3, a second lens group LG32, a filter OF3, and an optical axis OA3 from an object side to an image side in sequence. A protective glass CG3. The first lens group LG31 includes a first lens L31, a second lens L32, and a third lens L33 in order from the object side to the image side along the optical axis OA3. The second lens group LG32 extends from the object side along the optical axis OA3. The image side includes a fourth lens L34, a fifth lens L35, a sixth lens L36, and a seventh lens L37 in sequence. 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 second lens L32 is a meniscus lens, the object side surface S33 is convex, and both the object side surface S33 and the image side surface S34 are aspherical surfaces;

The third lens L33 is a meniscus lens, and its object side surface S35 is concave;

For the fourth lens L34, both the object side surface S38 and the image side surface S39 are spherical surfaces;

The object side S316 and the image side S317 of the filter OF3 are both flat surfaces;

The protective glass CG3, the object side S318 and the image side S319 are both flat;

Using the above-mentioned lens, aperture ST3, and a design that meets at least one of the conditions (1) to (7), the imaging lens 3 can effectively increase the field of view, effectively enhance the resolution, effectively resist environmental temperature changes, and effectively Correct day and night different focus, effective correction of aberration, effective correction of chromatic aberration.

Table 7 is a table of related parameters of each lens of the imaging 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~F are the aspheric coefficients.

Table 9 shows the relevant parameter values of the imaging 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 imaging lens 3 of the third embodiment can all satisfy the condition (1). ) To the requirements of condition (7).

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 field curvature of the imaging lens 3 of the third embodiment is between -0.04 mm and 0.05 mm. It can be seen from FIG. 6B that the distortion of the imaging lens 3 of the third embodiment is between -30% and 0%. It can be seen from Figure 6C that the imaging lens 3 of the third embodiment, when the image height is 0.000mm, the root mean square radius of the light spot is 1.732μm, the geometric radius of the light spot is 6.538μm, when the image height is When 1.087mm, the root mean square radius of the light spot is 2.215μm, and the geometric radius of the light spot is 11.996μm. When the image height is 1.811mm, the root mean square radius of the light spot is 2.626μm, and the geometric radius of the light spot When the image height is 2.898mm, the root mean square radius of the spot is 3.726µm, and the geometric radius of the spot is 19.580µm. When the image height is 3.623mm, the root mean square radius of the spot is 4.956μm, the geometric radius of the light spot is 25.056μm. It can be seen from FIG. 6D that the imaging lens 3 of the third embodiment has a modulation transfer function value between 0.0 and 0.75 when the focus shift is between -0.05 mm and 0.05 mm.

It is obvious that the field curvature and distortion of the imaging lens 3 of the third embodiment can be effectively corrected, and the focal depth can also meet the requirements, thereby obtaining better optical performance.

Please refer to Figure 7, the imaging lens 4 along an optical axis OA4 from one object side to one The image side sequentially includes a first lens group LG41, an aperture ST4, a second lens group LG42, a filter OF4 and a protective glass CG4. The first lens group LG41 includes a first lens L41, a second lens L42, and a third lens L43 in order from the object side to the image side along the optical axis OA4. The second lens group LG42 extends from the object side along the optical axis OA4. The image side includes a fourth lens L44, a fifth lens L45, a sixth lens L46, and a seventh lens L47 in sequence. 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 Mode], in which:

The second lens L42 is a meniscus lens, the object side S43 is convex, and both the object side S43 and the image side S44 are aspherical surfaces;

The third lens L43 is a double convex lens, and its object side surface S45 is a convex surface;

For the fourth lens L44, both the object side surface S48 and the image side surface S49 are spherical surfaces;

The object side S416 and the image side S417 of the filter OF4 are both flat surfaces;

The protective glass CG4, the object side S418 and the image side S419 are both flat;

Using the above-mentioned lens, aperture ST4, and a design that meets at least one of the conditions (1) to (7), the imaging lens 4 can effectively increase the field of view, effectively improve the resolution, effectively resist environmental temperature changes, and effectively Correct day and night different focus, effective correction of aberration, effective correction of chromatic aberration.

Table 10 is a table of related parameters of each lens of the imaging lens 4 in Figure 7.

The definition of the aspheric surface concavity z of the aspheric lens in Table 10 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 11 is a table of related parameters of the aspheric surface of the aspheric lens in Table 10, where k is the Conic Constant, and A~F are the aspheric coefficients.

Table 12 shows the relevant parameter values of the imaging lens 4 of the fourth embodiment and the calculated values of the corresponding conditions (1) to (7). From Table 12, it can be seen that the imaging lens 4 of the fourth embodiment can all meet the conditions (1) to the requirements of condition (7).

In addition, the optical performance of the imaging lens 4 of the fourth embodiment can also meet the requirements. It can be seen from FIG. 8A that the curvature of field of the imaging lens 4 of the fourth embodiment is between -0.04 mm and 0.08 mm. It can be seen from FIG. 8B that the distortion of the imaging lens 4 of the fourth embodiment is between -35% and 0%. It can be seen from Figure 8C that the imaging lens 4 of the fourth embodiment, when the image height is 0.000mm, the root mean square radius of the light spot is 2.065μm, the geometric radius of the light spot is 8.410μm, when the image height is When 1.087mm, the root mean square radius of the light spot is 2.519μm, and the geometric radius of the light spot is 13.042μm. When the image height is 1.811mm, the root mean square radius of the light spot is 2.992μm, and the geometric radius of the light spot When the image height is 2.898mm, the root mean square radius of the spot is 3.693µm, and the geometric radius of the spot is 17.253µm. When the image height is 3.623mm, the root mean square radius of the spot is 4.740μm, the geometric radius of the light spot is 19.875μm. It can be seen from FIG. 8D that the imaging lens 4 of the fourth embodiment has a modulation transfer function value between 0.0 and 0.76 when the focus shift is between -0.05 mm and 0.05 mm.

It is obvious that the field curvature and distortion of the imaging lens 4 of the fourth embodiment can be effectively corrected, and the focal depth 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 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 the scope of the attached patent application.

1: imaging lens

LG11: The first lens group

ST1: Aperture

LG12: Second lens group

L11: The first lens

L12: second lens

L13: third lens

L14: Fourth lens

L15: fifth lens

L16: sixth lens

L17: seventh lens

OF1: filter

CG1: Protective glass

IMA1: imaging surface

OA1: Optical axis

S11: Object side of the first lens

S12: The side of the first lens image

S13: Object side of the second lens

S14: Second lens image side

S15: Third lens object side

S16: Third lens image side

S17: Aperture surface

S18: Object side of the fourth lens

S19: Fourth lens image side

S110: fifth lens object side

S111: Side view of the fifth lens

S112: sixth lens object side

S113: Sixth lens image side

S114: seventh lens object side

S115: Side view of seventh lens

S116: Side of the filter object

S117: Filter image side

S118: Protect the side of the glass object

S119: Protect the side of the glass image

Claims (10)

An imaging lens, including: A first lens is a meniscus lens with refractive power, and includes a convex surface facing an object side and a concave surface facing an image side; A second lens with negative refractive power; A third lens having positive refractive power, and the third lens includes a convex surface facing the image side; One aperture A fourth lens having refractive power, and the fourth lens includes a convex surface facing the image side; A fifth lens having positive refractive power, and the fifth lens includes a convex surface facing the object side; A sixth lens is a biconcave lens with negative refractive power, and includes a concave surface facing the object side and another concave surface facing the image side; and A seventh lens having refractive power, and the seventh lens includes a convex surface facing the image side; Wherein the first lens, the second lens, the third lens, the aperture, the fourth lens, the fifth lens, the sixth lens, and the seventh lens along an optical axis from the object side to the image Arranged side by side; The imaging lens meets the following conditions: 4.3

TTL/BFL

5.3; Wherein, TTL is a distance from an object side of the first lens to an imaging surface on the optical axis, and BFL is a distance from an image side of the seventh lens to the imaging surface on the optical axis. An imaging lens, including: A first lens is a meniscus lens with refractive power, and includes 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 concave surface facing the image side; A third lens having positive refractive power, and the third lens includes a convex surface facing the image side; One aperture A fourth lens having refractive power, and the fourth lens includes a convex surface facing an image side; A fifth lens having positive refractive power, and the fifth lens includes a convex surface facing the object side; A sixth lens is a biconcave lens with negative refractive power, and includes a concave surface facing the object side and another concave surface facing the image side; and A seventh lens having refractive power, and the seventh lens includes a convex surface facing the image side; Wherein the first lens, the second lens, the third lens, the aperture, the fourth lens, the fifth lens, the sixth lens, and the seventh lens along an optical axis from the object side to the image Arranged side by side; The imaging lens meets the following conditions: -1

(R ₄₁ +R ₄₂ )/(R ₄₁ -R ₄₂ )

0; Wherein, R _{41 is a} radius of curvature of an object side surface of _{the fourth lens, and R 42 is a} radius of curvature of an image side surface of the fourth lens. Such as the imaging lens described in item 1 or item 2 of the scope of patent application, in which: The refractive power of the first lens is negative; The fourth lens has positive refractive power and further includes another convex surface facing the object side; The fifth lens further includes another convex surface facing the image side; and The seventh lens has positive refractive power and further includes another convex surface facing the object side. The imaging lens described in item 3 of the scope of patent application, wherein the second lens includes a concave surface facing the object side. The imaging lens described in item 3 of the scope of patent application, wherein the second lens includes a convex surface facing the object side. According to the imaging lens described in item 3 of the scope of patent application, the third lens further includes another convex surface facing the object side. The imaging lens described in item 3 of the scope of patent application, wherein the third lens includes a concave surface facing the object side. The imaging lens described in item 1 or item 2 of the scope of patent application, wherein the fifth lens and the sixth lens are cemented. The imaging lens described in item 1 or item 2 of the scope of patent application, wherein the seventh lens is an aspheric lens. Such as the imaging lens described in item 1 or item 2 of the scope of patent application, wherein the imaging lens satisfies at least one of the following conditions: 8.5

TTL/f

11.5; -3.5

f ₁ /f

-2.4; 3

f ₃ /f

6; 2.5

f ₇ /f

5.2; 17.4

f+f ₃

23.8; Wherein, TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, f is an effective focal length of the imaging lens, f _{1 is} an effective focal length of the first lens, and f ₃ is An effective focal length of the third lens, f _{7 is} an effective focal length of the seventh lens.

Images