CN213780508U

CN213780508U - 12mm large target surface lens

Info

Publication number: CN213780508U
Application number: CN201921846134.XU
Authority: CN
Inventors: 吴强华; 李治; 崔灵敏; 胡长涛; 汪晓旭
Original assignee: Shenzhen Trace Optical Co ltd
Current assignee: Shenzhen Trace Optical Co ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2021-07-23
Anticipated expiration: 2029-10-30

Abstract

The embodiment of the utility model discloses a 12mm large target surface lens, including first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, the object plane side of first lens, eighth lens is the convex surface, and the image plane side is the concave surface; the object side of the second lens is a convex surface, and the image side of the second lens is a convex surface; the object plane side of the third lens is a concave surface, and the image plane side of the third lens is a concave surface; the object plane side of the fourth lens is a convex surface, and the image plane side of the fourth lens is a concave surface; the object plane side of the fifth lens is a concave surface, and the image plane side of the fifth lens is a concave surface; the object plane side of the sixth lens is a convex surface, and the image plane side of the sixth lens is a convex surface; the object side of the seventh lens is a convex surface, and the image side of the seventh lens is a convex surface; and satisfy：‑2.76<f₇/f₁<-1.17; wherein f is₁、f₇Is the focal length of the first and seventh lenses. The utility model provides a little with high costs problem of target surface of 12mm camera lens, effectively reduced the cost, colour difference and the structural tolerance sensitivity of well telephoto lens for the whole image plane of camera lens is even, luminance is high, the target surface is big.

Description

12mm large target surface lens

Technical Field

The utility model relates to an optics module technical field that makes a video recording especially relates to a big target surface camera lens of 12 mm.

Background

The medium and long focus lens has a certain strength of telephoto capability, shortens the depth of field and is used for shooting. However, the target surface of the current common intermediate-long-focus lens (such as a 12mm lens) is small, generally less than 2/3 ″, and the cost of the large target surface is high. Therefore, it is necessary to develop a low-cost high-sensitivity imaging chip with a maximum image plane exceeding 2/3 "medium-focus lens matching 2/3".

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a technical problem that will solve provides a big target surface camera lens of 12mm to make the problem of solving that the target surface is little, with high costs.

In order to solve the above technical problem, an embodiment of the present invention provides a 12mm large target lens, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, which are sequentially disposed from an object plane to an image plane along an optical axis, wherein the object plane side of the first lens is a convex surface, and the image plane side is a concave surface; the object side of the second lens is a convex surface, and the image side of the second lens is a convex surface; the object plane side of the third lens is a concave surface, and the image plane side of the third lens is a concave surface; the object plane side of the fourth lens is a convex surface, and the image plane side of the fourth lens is a concave surface; the object plane side of the fifth lens is a concave surface, and the image plane side of the fifth lens is a concave surface; the object plane side of the sixth lens is a convex surface, and the image plane side of the sixth lens is a convex surface; the object side of the seventh lens is a convex surface, and the image side of the seventh lens is a convex surface; the object plane side of the eighth lens is a convex surface, and the image plane side of the eighth lens is a concave surface;

and the large target surface lens meets the following conditions:

-2.76<f₇/f₁<-1.17；

wherein f is₁Is as followsFocal length of a lens, f₇Is the focal length of the seventh lens.

Further, the second lens and the third lens are a set of combined lenses.

Further, the following condition is also satisfied:

-1.62<(f₂/f₃)<-0.53；

wherein f is₂Is the focal length of the second lens, f₃Is the third lens focal length.

Further, the total optical length ttl of the large-target-surface lens satisfies: more than or equal to 55mm and less than or equal to 65 mm.

Further, the fifth lens and the sixth lens are a group of combined lenses.

Furthermore, the protection glass is arranged between the eighth lens and the image surface.

The utility model has the advantages that: the utility model solves the problems of small target surface and high cost of the 12mm lens, effectively reduces the cost, chromatic aberration and structural tolerance sensitivity of the medium and long focal length lens, and ensures that the whole image surface of the lens is uniform, the brightness is high and the target surface is large; the utility model discloses a total lens length TTL is preferred to be 64mm, and eight lenses are constituteed, can match 2/3 "and following target surface SENSOR, and resolution ratio reaches 5 megapixels.

Drawings

Fig. 1 is a structural diagram of a 12mm large target surface lens according to an embodiment of the present invention.

Fig. 2 is a first analytic view of a 12mm large target lens according to an embodiment of the present invention.

Fig. 3 is a second analysis diagram of a 12mm large target lens according to an embodiment of the present invention.

Fig. 4 is a field curvature diagram of a 12mm large target surface lens according to an embodiment of the present invention.

Fig. 5 is a distortion diagram of a 12mm large target surface lens according to an embodiment of the present invention.

Fig. 6 is a relative illuminance diagram of a 12mm large target lens according to an embodiment of the present invention.

Description of the reference numerals

First lens 1

Second lens 2

Third lens 3

Fourth lens 4

Fifth lens 5

Sixth lens 6

Seventh lens 7

Eighth lens 8

Cover glass 9

And a diaphragm ST.

Detailed Description

It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

In the embodiment of the present invention, if there is directional indication (such as upper, lower, left, right, front, and rear … …) only for explaining the relative position relationship between the components and the motion situation under a certain posture (as shown in the drawing), if the certain posture is changed, the directional indication is changed accordingly.

In addition, the descriptions of the first, second, etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Referring to fig. 1 to 6, a 12mm large target lens according to an embodiment of the present invention includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and an eighth lens 8 sequentially disposed from an object plane to an image plane along an optical axis.

The object plane side of the first lens 1 is a convex surface, and the image plane side is a concave surface. The object surface side of the second lens 2 is convex, and the image surface side is convex. The object plane side of the third lens 3 is a concave surface, and the image plane side is a concave surface. The fourth lens element 4 has a convex object surface side and a concave image surface side. The fifth lens 5 has a concave object surface side and a concave image surface side. The sixth lens element 6 has a convex object surface side and a convex image surface side. The seventh lens element 7 has a convex object surface side and a convex image surface side. The eighth lens element 8 has a convex object surface side and a concave image surface side.

The utility model discloses big target surface camera lens of 12mm satisfies following condition:

-2.76<f₇/f₁<-1.17；

wherein f is₁Is the focal length of the first lens 1, f₇Is the focal length of the seventh lens 7.

As an embodiment, the second lens 2 and the third lens 3 are a set of combined lenses.

As an embodiment, the following condition is also satisfied:

-1.62<(f₂/f₃)<-0.53；

wherein f is₂Is the focal length of the second lens 2, f₃Is the focal length of the third lens 3.

In one embodiment, the total optical length ttl of the large-target-surface lens satisfies: more than or equal to 55mm and less than or equal to 65 mm.

In one embodiment, the fifth lens 5 and the sixth lens 6 are a set of combined lenses.

As an embodiment, the protection glass 9 is further included between the eighth lens 8 and the image plane.

The embodiment of the present invention provides an in the infinite working distance, the total focal length f of the lens is 12mm, FNO is 1.4, the image height is 11mm, the resolution reaches 500 ten thousand pixels, 2/3 ″ target surface chip is matched, and each parameter of the lens group is listed in table 1 in sequence:

TABLE 1

In the above table and in fig. 1, S1, S2 correspond to two surfaces of the first lens 1 from the object plane to the image plane along the optical axis; s3, S4 correspond to both surfaces of the second lens 2; s4, S5 correspond to both surfaces of the third lens 3 (S4 is a common surface where the second lens 2 and the third lens 3 are cemented), and S6, S7 correspond to both surfaces of the fourth lens 4; STO is where stop ST is located; s8, S9 correspond to both surfaces of the fifth lens 5; s9, S10 correspond to both surfaces of the sixth lens 6, and S11, S12 correspond to both surfaces of the seventh lens 7; s13, S14 correspond to both surfaces of the eighth lens 8. In the above table, S15 and S16 represent both surfaces of the cover glass 9.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A12 mm large target surface lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are arranged along an optical axis from an object surface to an image surface in sequence, and is characterized in that the object surface side of the first lens is a convex surface, and the image surface side of the first lens is a concave surface; the object side of the second lens is a convex surface, and the image side of the second lens is a convex surface; the object plane side of the third lens is a concave surface, and the image plane side of the third lens is a concave surface; the object plane side of the fourth lens is a convex surface, and the image plane side of the fourth lens is a concave surface; the object plane side of the fifth lens is a concave surface, and the image plane side of the fifth lens is a concave surface; the object plane side of the sixth lens is a convex surface, and the image plane side of the sixth lens is a convex surface; the object side of the seventh lens is a convex surface, and the image side of the seventh lens is a convex surface; the object plane side of the eighth lens is a convex surface, and the image plane side of the eighth lens is a concave surface;

and the large target surface lens meets the following conditions:

-2.76<f₇/f₁<-1.17；

wherein f is₁Is the focal length of the first lens, f₇Is the focal length of the seventh lens.

2. The 12mm large target lens of claim 1, wherein the second lens and the third lens are a set of compound lenses.

3. The 12mm large target lens of claim 1, further satisfying the following condition:

-1.62<(f₂/f₃)<-0.53；

4. The 12mm large-target lens of claim 1, wherein the optical overall length ttl of the large-target lens satisfies: more than or equal to 55mm and less than or equal to 65 mm.

5. The 12mm large target lens of claim 1, wherein the fifth lens and the sixth lens are a set of compound lenses.

6. The 12mm large target lens according to claim 1, further comprising a protective glass disposed between the eighth lens element and the image plane.