CN211979312U

CN211979312U - Low-cost ultra-wide angle collimating lens

Info

Publication number: CN211979312U
Application number: CN202020488247.3U
Authority: CN
Inventors: 吴强华; 胡长涛; 张福美
Original assignee: Jiangxi Telaisi Optical Co ltd
Current assignee: Jiangxi Telaisi Optical Co ltd
Priority date: 2020-04-07
Filing date: 2020-04-07
Publication date: 2020-11-20
Anticipated expiration: 2030-04-07

Abstract

The utility model discloses a low-cost super wide angle collimating lens includes from the object plane to image plane along the optical axis in proper order: the lens comprises a first lens, a second lens, a diaphragm and a third lens; the object side of the first lens is a convex surface, and the image side of the first lens is a concave surface; the object side of the second lens is a concave surface, and the image side of the second lens is a concave surface; the object plane side of the third lens is a concave surface, and the image plane side of the third lens is a convex surface; the focal length of the first lens is f1, -150.56< f1< -115.95, the focal length of the second lens is f2, and 3.5< (f1/f2) < 8.3. The utility model discloses a low-cost super wide angle collimating lens comprises three lens, and is with low costs, through first lens to third lens arrange and the scope condition of focus between them realize when the working distance is infinity, low-cost super wide angle collimating lens's angle of vision FOV ═ 180, and when the entry diameter was 42mm, the parallel beam maximum distance that comes out reached 34 mm.

Description

Low-cost ultra-wide angle collimating lens

Technical Field

The utility model relates to an optical imaging technical field, especially a low-cost super wide angle collimating lens.

Background

At present, the existing collimating lens system generally has too many lenses, a complex structure, a high cost and a small field angle, and it is necessary to develop a collimating lens system with few lenses, a low cost and a wide angle to solve the defects of too many lenses, a complex structure, a high cost and a small field angle of the existing collimating lens system. Therefore, a low-cost ultra-wide angle collimating lens is needed.

Disclosure of Invention

In order to overcome the defects, the utility model discloses a solve the problem that current collimating lens's lens is too much, the structure is complicated, the cost is higher and the angle of vision is little, provide a low-cost super wide angle collimating lens.

In order to achieve the purpose, the utility model is implemented according to the following technical scheme:

the utility model provides a low-cost super wide angle collimating lens, low-cost super wide angle collimating lens includes from the object plane to image plane along the optical axis in proper order: the lens comprises a first lens, a second lens, a diaphragm and a third lens; the object plane side of the first lens is a convex surface, and the image plane side of the first lens is a concave surface; the object side of the second lens is a concave surface, and the image side of the second lens is a concave surface; the object plane side of the third lens is a concave surface, and the image plane side of the third lens is a convex surface; the focal length of the first lens is f1, -150.56< f1< -115.95, the focal length of the second lens is f2, and 3.5< (f1/f2) < 8.3.

Further, the refractive index of the first lens is Nd1, the abbe number of the first lens is Vd1, and 1.43< Nd1<1.68, 52.6< Vd1< 68.4.

Further, the refractive index of the second lens is Nd2, the abbe number of the second lens is Vd2, and 1.84< Nd2<1.98, 15< Vd2< 25.

Further, the refractive index of the third lens is Nd3, the abbe number of the third lens is Vd3, and 1.45< Nd3<1.55, 65.3< Vd3< 76.5.

The utility model discloses a low-cost super wide angle collimating lens through first lens to third lens arrange and the scope condition of focus between them realize when working distance is infinity, low-cost super wide angle collimating lens's angle of vision FOV ═ 180.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the field angle of the utility model can reach 180 degrees;

2. the utility model discloses constitute by three lens, with low costs and when the working distance is the infinity, when the entry diameter is 42mm, the parallel beam maximum distance that comes out reaches 34 mm.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic view of a lens structure according to an embodiment of the present invention;

fig. 2 is a relative illuminance diagram according to an embodiment of the present invention.

Detailed Description

The invention will be further described with reference to the drawings and specific embodiments, illustrative embodiments and description of which are provided herein to explain the invention, but not as a limitation thereof.

As shown in fig. 1, the low-cost super-wide-angle collimating lens sequentially includes, from an object plane to an image plane along an optical axis: a first lens E1, a second lens E2, a stop ST, and a third lens E3; the object surface side of the first lens E1 is a convex surface, and the image surface side is a concave surface; the object surface side of the second lens E2 is a concave surface, and the image surface side is a concave surface; the object surface side of the third lens E3 is a concave surface, and the image surface side is a convex surface; the focal length of the first lens E1 is f1, -150.56< f1< -115.95, the focal length of the second lens E2 is f2, and 3.5< (f1/f2) < 8.3.

Further, the refractive index of the first lens E1 is Nd1, the abbe number of the first lens E1 is Vd1, and 1.43< Nd1<1.68, 52.6< Vd1< 68.4.

Further, the refractive index of the second lens E2 is Nd2, the abbe number of the second lens E2 is Vd2, and 1.84< Nd2<1.98, 15< Vd2< 25.

Further, the refractive index of the third lens E3 is Nd3, the abbe number of the third lens E3 is Vd3, and 1.45< Nd3<1.55, 65.3< Vd3< 76.5.

Wherein: as shown in fig. 1, the object surface side of the first lens is S1, the image surface side is S2, the object surface side of the second lens is S4, the image surface side is S5, the stop is ST, the object surface side of the third lens is S6, and the image surface side is S7.

To verify the optical performance of the low-cost ultra-wide angle collimating lens of this embodiment, when the working distance is infinity, the field angle FOV is 180 °, and the entrance diameter is 42mm, the maximum distance of the outgoing parallel beam reaches 34mm, and the parameters of the lens groups are listed in table 1 in sequence.

TABLE 1

In the above table, Index is a refractive Index, Radius is a curvature Radius, ABB is an ABB, EFL-E is a focal length, and focal lengths of the first lens and the third lens are f1 to f3 in this order, which can be obtained from table 1:

f1 ═ -128.56, which satisfies the design of-150.56 < f1< -115.95 described above; (f1/f2) — 128.56/-20.48 ═ 6.18076823, which satisfies the above-mentioned design of 3.5< (f1/f2) < 8.3.

The refractive index of the first lens E1 is Nd 1-1.48, and the abbe number of the first lens E1 is Vd 1-58.3, which satisfy the above-mentioned design of 1.43< Nd1<1.68, and 52.6< Vd1< 68.4.

The refractive index of the second lens E2 is Nd 2-1.92, and the abbe number of the second lens E2 is Vd 2-20, so that the design of 1.84< Nd2<1.98 and 15< Vd2<25 is satisfied.

The refractive index of the third lens E3 is Nd 3-1.46, and the abbe number of the third lens E3 is Vd 3-68.3, which satisfy the above-mentioned design of 1.45< Nd3<1.55, and 65.3< Vd3< 76.5.

Fig. 2 is a diagram of relative illumination of a low-cost super-wide angle collimating lens of this embodiment when the working distance is infinity. As shown in fig. 2, where the relative illuminance is greater than 78%.

The technical scheme of the utility model is not limited to the restriction of above-mentioned specific embodiment, all according to the utility model discloses a technical scheme makes technical deformation, all falls into within the protection scope of the utility model.

Claims

1. A low-cost super wide angle collimating lens which characterized in that: the low-cost super wide angle collimating lens includes from object plane to image plane along the optical axis in proper order: the lens comprises a first lens, a second lens, a diaphragm and a third lens; the object plane side of the first lens is a convex surface, and the image plane side of the first lens is a concave surface; the object side of the second lens is a concave surface, and the image side of the second lens is a concave surface; the object plane side of the third lens is a concave surface, and the image plane side of the third lens is a convex surface; the focal length of the first lens is f1, -150.56< f1< -115.95, the focal length of the second lens is f2, and 3.5< (f1/f2) < 8.3.

2. The low-cost ultra-wide angle collimating lens of claim 1, wherein: the refractive index of the first lens is Nd1, the abbe number of the first lens is Vd1, and 1.43< Nd1<1.68, 52.6< Vd1< 68.4.

3. The low-cost ultra-wide angle collimating lens of claim 1, wherein: the refractive index of the second lens is Nd2, the abbe number of the second lens is Vd2, and 1.84< Nd2<1.98, 15< Vd2< 25.

4. The low-cost ultra-wide angle collimating lens of claim 1, wherein: the refractive index of the third lens is Nd3, the abbe number of the third lens is Vd3, and 1.45< Nd3<1.55, 65.3< Vd3< 76.5.