CN208937802U

CN208937802U - A kind of overlength depth of focus exposes thoroughly the telecentricity field lens of breadth

Info

Publication number: CN208937802U
Application number: CN201821852311.0U
Authority: CN
Inventors: 周滔; 乔士琪
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-11-12
Filing date: 2018-11-12
Publication date: 2019-06-04
Anticipated expiration: 2028-11-12

Abstract

It exposes thoroughly the telecentricity field lens of breadth the utility model relates to a kind of overlength depth of focus, including entrance pupil surface and laser field lens working surface, the first lens, the second lens, the third lens and diaphragm with diopter are set gradually between the entrance pupil surface and laser field lens working surface.Overcome the focal length of the more big corresponding field lens of breadth of field lens and the problem that operating distance is bigger；Overcome that field lens focal length is longer, the hot spot that laser focuses will bigger energy density become smaller, will lead to the very shallow problem of mark depth；It overcomes laser energy and is lost in air bigger, the lines typed it out are thicker, and shallow problem.

Description

A kind of overlength depth of focus exposes thoroughly the telecentricity field lens of breadth

Technical field

The utility model relates to field lens device field, specifically a kind of overlength depth of focus exposes thoroughly the telecentricity field lens of breadth.

Background technique

Field lens is that beam of laser is focused on a bit for focusing, can metric density upgrading with reach engraving The purpose of, a variety of field lenses are disclosed in the prior art, as Chinese utility model patent CN207216123U discloses a kind of big coke Away from salt free ligands face medium-wave infrared double-view field camera lens, comprising: be a piece of convex surface towards object space with first fixed group of positive light coke The germanium negative lens of falcate silicon positive lens and a piece of convex surface towards object space；Zoom group with negative power, it is negative saturating for two panels germanium Mirror；Latter fixed group with positive light coke, be that a piece of convex surface is just saturating towards the zinc sulphide negative lens of object space and the silicon of a piece of biconvex Mirror；Secondary imaging group with positive light coke, be a piece of biconvex zinc selenide positive lens, the zinc sulphide negative lens of a piece of concave-concave, The silicon positive lens of a piece of biconvex, optical axis stable is high, there is good imaging effect, but still has the drawback that work as and need breadth When biggish field lens, it is bigger that there are breadths, corresponding field lens focal length and the bigger problem of operating distance；Simultaneously as focal length becomes Long, hot spot becomes larger, and energy density becomes smaller, and laser energy is lost greatly in air, and the lines of mark are thick and depth is excessively shallow, influences to imitate Fruit.

Utility model content

It exposes thoroughly the telecentricity field lens of breadth the technical problem to be solved by the utility model is to provide a kind of overlength depth of focus, with Solve defect existing in the prior art.

The technical solution that the utility model solves above-mentioned technical problem is as follows:

A kind of overlength depth of focus exposes thoroughly the telecentricity field lens of breadth, including entrance pupil surface and laser field lens working surface, described The first lens, the second lens, the third lens with diopter are set gradually between entrance pupil surface and laser field lens working surface And diaphragm, wherein the focal length of the first lens is negative, the focal length of the second lens is positive, and the focal length of the third lens is positive, entire field The focal length of mirror is 150-170 millimeters, and the optics total length of field lens is 110-130 millimeters, and depth of focus is more than or equal to 3 millimeters, uses wave A length of 1064nm, sweep amplitude are greater than 80*80 millimeters.

The beneficial effects of the utility model are: the focal length and operating distance of the more big corresponding field lens of the breadth for overcoming field lens Bigger problem；Overcome that field lens focal length is longer, the hot spot that laser focuses will bigger energy density become smaller, will lead to mark depth Spend very shallow problem；It overcomes laser energy and is lost in air bigger, the lines typed it out are thicker, and shallow problem.

Detailed description of the invention

FIG. 1 is a schematic structural view of the utility model；

The reference numerals are as follows:

1, entrance pupil surface, the 2, first lens, the 3, second lens, 4, the third lens, 5, diaphragm, 6, laser field lens worksheet Face；

Specific embodiment

The principles of the present invention and feature are described below in conjunction with attached drawing, example is served only for explaining that this is practical It is novel, it is not intended to limit the scope of the utility model.

The telecentricity field lens of breadth as shown in Figure 1, a kind of overlength depth of focus exposes thoroughly, including entrance pupil surface and the work of laser field lens Surface, set gradually between the entrance pupil surface and laser field lens working surface the first lens with diopter, the second lens, The third lens and diaphragm, wherein the focal length of the first lens is negative, the focal length of the second lens is positive, and the focal length of the third lens is Just, the focal length of entire field lens is 150-170 millimeters, and the optics total length of field lens is 110-130 millimeters, and depth of focus is more than or equal to 3 millis Rice, is 1064nm using wavelength, and sweep amplitude is greater than 80*80 millimeters.

Concrete operating principle:

After laser is incident from entrance pupil surface, into the first lens for concavees lens, then laser enters convex surface and is oppositely arranged The second lens and the third lens, be converted into directional light, by after diaphragm enter laser field mirror working surface, overcome field lens The more big corresponding field lens of breadth focal length and the bigger problem of operating distance, mark is clear and depth can satisfy requirement.

The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model Within the scope of shield.

Claims

The telecentricity field lens of breadth 1. a kind of overlength depth of focus exposes thoroughly, it is characterised in that: work including entrance pupil surface and laser field lens Surface, set gradually between the entrance pupil surface and laser field lens working surface the first lens with diopter, the second lens, The third lens and diaphragm, wherein the focal length of the first lens is negative, the focal length of the second lens is positive, and the focal length of the third lens is Just, the focal length of entire field lens is 150-170 millimeters, and the optics total length of field lens is 110-130 millimeters, and depth of focus is more than or equal to 3 millis Rice, is 1064nm using wavelength, and sweep amplitude is greater than 80*80 millimeters.