CN204287583U

CN204287583U - Focus long depth of field micro-lens

Info

Publication number: CN204287583U
Application number: CN201420795493.8U
Authority: CN
Inventors: 周建宝; 刘辉; 柳振全; 杨樟洪
Original assignee: Fujian Forecam Optics Co Ltd
Current assignee: Fujian Forecam Optics Co Ltd
Priority date: 2014-12-17
Filing date: 2014-12-17
Publication date: 2015-04-22
Anticipated expiration: 2024-12-17

Abstract

The utility model relates to one and focuses long depth of field micro-lens, comprise the optical system be arranged in primary mirror bucket, to be the focal power set gradually along light direction be described optical system that negative front group and focal power are positive rear group, described front group comprises and is disposed with plano-convex lens, negative selenodont lens and plano-concave lens, the described rear group of gummed group being biconvex lens and biconvex lens and touching, compared with prior art, the utility model has following beneficial effect: the utility model has the advantage of little relative aperture, high resolving power, depth of field length.

Description

Focus long depth of field micro-lens

Technical field

The utility model relates to one and focuses long depth of field micro-lens.

Background technology

It is large to meet illumination requirement that existing camera lens conventional design is all relative aperture, but for tight shot can not focus just need the depth of field ensure greatly before and after have larger definition range.

Utility model content

The purpose of this utility model is for above weak point, provides one and focuses long depth of field micro-lens.

The scheme that the utility model technical solution problem adopts is that one focuses long depth of field micro-lens, comprise the optical system be arranged in body tube, to be the focal power set gradually along light direction be described optical system that negative front group and focal power are positive rear group, described front group is disposed with plano-convex lens, negative selenodont lens and plano-concave lens, the described rear group of gummed group being biconvex lens and biconvex lens and touching.

Further, the airspace between described front group and rear group is 3.03mm.

Further, the airspace between described plano-convex lens and negative selenodont lens is 0.15mm, and the airspace between described negative selenodont lens and plano-concave lens is 0.46mm.

Further, described body tube front end is provided with the front trim ring pushing down plano-convex lens, is provided with the first spacer ring between described plano-convex lens and negative selenodont lens, is provided with the second spacer ring between described front group and rear group.

Further, the relative aperture of described second spacer ring internal diameter is 1:6.

Further, before described, the focal length of group is-8.66mm, and the focal length of described rear group is 6.92mm.

Compared with prior art, the utility model has following beneficial effect: the utility model has the advantage of little relative aperture, high resolving power, depth of field length.Adopt the retrofocus type structure that positive negative power is separated, the focal distance f of front group of A =-8.66mm, the focal distance f of rear group of B =6.92mm, after two constituent element combinations, make rear leading role's reach of camera lens, the rear cut-off distance of camera lens reaches 7.24mm; The lens of front group of camera lens all select the glass of high index of refraction to assume responsibility for very large focal power, through after organize B refraction after, the angle of chief ray and optical axis reduces, and depth of field change greatly, makes camera lens achieve excellent aberration correction, and makes the uniform-illumination of image planes, clear; Place the gummed group of two biconvex lens rear group of camera lens, effectively utilize the aberration that it carrys out corrective lens, make the resolution of camera lens up to mega pixel.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the utility model patent is further illustrated.

Fig. 1 is structural representation of the present utility model;

In figure:

Trim ring before 1-; 2-first spacer ring; 3-body tube; 4-second spacer ring; 5-plano-convex lens; 6-bears selenodont lens; 7-plano-concave lens; 8-gummed group.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is further illustrated.

As shown in Figure 1, one focuses long depth of field micro-lens, comprise the optical system be arranged in body tube 3, to be the focal power set gradually along light direction be described optical system that negative front group and focal power are positive rear group, described front group is disposed with plano-convex lens 5, negative selenodont lens 6 and plano-concave lens 7, the described rear group of gummed group 8 being biconvex lens and biconvex lens and touching, the lens of front group of camera lens all select the glass of high index of refraction to assume responsibility for very large focal power, through after organize B refraction after, the angle of chief ray and optical axis reduces, the depth of field becomes large, camera lens is made to achieve excellent aberration correction, and make the uniform-illumination of image planes, clear, place the gummed group of two biconvex lens rear group of camera lens, effectively utilize the aberration that it carrys out corrective lens, make the resolution of camera lens up to mega pixel.

In the present embodiment, the airspace between described front group and rear group is 3.03mm.

In the present embodiment, the airspace between described plano-convex lens 5 and negative selenodont lens 6 is 0.15mm, and the airspace between described negative selenodont lens 6 and plano-concave lens 7 is 0.46mm.

In the present embodiment, described body tube 3 front end is provided with the front trim ring 1 pushing down plano-convex lens 5, is provided with the first spacer ring 2 between described plano-convex lens 5 and negative selenodont lens 6, is provided with the second spacer ring 4 between described front group and rear group.

In the present embodiment, the light field in optics is put and is reduced by described second spacer ring 4, and the internal diameter of the second spacer ring 4 is 1:6 according to its relative aperture of optical design.

In the present embodiment, before described, the focal length of group is-8.66mm, and the focal length of described rear group is 6.92mm, and after two constituent element combinations, make rear leading role's reach of camera lens, the rear cut-off distance of camera lens reaches 7.24mm.

In the present embodiment, when optical design, aberration correction and balance are carried out to the wide spectral range of 485 ~ 850nm, camera lens is made all to have excellent picture element at wide spectral range, such camera lens can not only blur-free imaging under photoenvironment in the daytime, under night pole low-light (level) environment, by infrared light filling, also can blur-free imaging.

In the present embodiment, this camera lens reaches following optical index: (1) focal length: f '=16mm; (2) relative aperture F=1:6; (3) field angle: 2w≤28 °; (4) resolution: can be adaptive with mega pixel high-resolution CCD or cmos camera; (5) light path overall length ∑≤19.67mm, optics rear cut-off distance l ' >=7.24mm; (6) spectral line scope: 486nm ~ 656nm is suitable for.

Above-listed preferred embodiment; the purpose of this utility model, technical scheme and advantage are further described; be understood that; the foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims

1. one kind focuses long depth of field micro-lens, it is characterized in that: comprise the optical system be arranged in body tube, to be the focal power set gradually along light direction be described optical system that negative front group and focal power are positive rear group, described front group is disposed with plano-convex lens, negative selenodont lens and plano-concave lens, the described rear group of gummed group being two biconvex lens and touching.

2. according to claims 1, focus long depth of field micro-lens, it is characterized in that: the airspace between described front group and rear group is 3.03mm.

3. according to claims 1, focus long depth of field micro-lens, it is characterized in that: the airspace between described plano-convex lens and negative selenodont lens is 0.15mm, the airspace between described negative selenodont lens and plano-concave lens is 0.46mm.

4. according to claims 1, focus long depth of field micro-lens, it is characterized in that: described body tube front end is provided with the front trim ring pushing down plano-convex lens, be provided with the first spacer ring between described plano-convex lens and negative selenodont lens, between described front group and rear group, be provided with the second spacer ring.

5. according to claims 4, focus long depth of field micro-lens, it is characterized in that: the relative aperture of described second spacer ring internal diameter is 1:6.

6. according to claims 1, focus long depth of field micro-lens, it is characterized in that: before described, the focal length of group is-8.66mm, and the focal length of described rear group is 6.92mm.