CN2585256Y

CN2585256Y - F theta object lens with two aperture diaphragms in front of it

Info

Publication number: CN2585256Y
Application number: CN 02288396
Authority: CN
Inventors: 黄宣劭
Original assignee: Shanghai Institute of Laser Technology
Current assignee: Shanghai Institute of Laser Technology
Priority date: 2002-12-18
Filing date: 2002-12-18
Publication date: 2003-11-05
Anticipated expiration: 2012-12-18

Abstract

The utility model relates to an f theta objective lens with two aperture diaphragms in the front end, which comprises two diaphragms and an optical assembly. The utility model is characterized in that the optical assembly comprises a first lens, a second lens and a third lens; from the object side, the first lens is a negative meniscus lens, the second lens is a positive meniscus lens, and the third lens is a convex-plane lens; the convex surfaces of the three lenses all face a processed object, namely the image side; the two diaphragms are placed in front of the first lens. Due to the adoption of the structure of the scheme, the utility model has the advantages of small volume of the lenses, processing convenience, simple assembly technology and convenient mass production. The utility model is particularly suitable for being used as an objective lens used for the laser processing of various focal lengths from the ultraviolet band to the near infrared wave band, and pattern scanning.

Description

Two aperture diaphragms place the f θ object lens of front end

Technical field

Two aperture diaphragms that the utility model relates to a kind of multi-wavelength's from ultraviolet light near infrared light multiple focal length place the f θ object lens of front end, can be widely used in the graph scanning and the Laser Processing of various wavelength.

Background technology

Because laser beam has high monochromaticity, the characteristic of high brightness and good directionality, it is widely used in the laser scanning figure, plate-making and Laser Processing, mark etc.Adopt two galvanometers the light beam efficient transformation can be become the light beam of required direction, and utilize f θ object lens to make it to focus on the processed object to realize designed figure or mark, it requires object lens focusing correct position, figure meticulous, therefore adopt two aperture diaphragms place front end f θ object lens be inevitable, yet, at present designed f θ object lens often adopt the glass of special requirement such as high refractivity and are designed to bigger bore, thereby cause relatively difficulty of processing, shortcomings such as cost of manufacture height, and assembly difficulty is also big.

Summary of the invention: the purpose of this utility model is in order to overcome the shortcoming of existing f θ object lens, the f θ object lens that a kind of volume is little, assembly technology simply places front end applicable to two aperture diaphragms from ultraviolet to the multiple focal length of near infrared multi-wavelength to be provided.

Two aperture light orchids place the f θ object lens of front end to include two diaphragms and an optical group, be characterized in, optical group comprises first, second, third eyeglass, from object space, first eyeglass is negative crescent, and second eyeglass is positive crescent, and prismatic glasses is the convexo-plane lens, its convex surface of three set of contact lenses all towards processed object side promptly as the side, two diaphragms are positioned at the place ahead of first eyeglass.

After adopting the structure of such scheme, the volume of camera lens is little, easy to process, assembly technology is simple, can produce in a large number easily, and it is specially adapted to the Laser Processing of the various focal lengths from ultraviolet to near-infrared band and the object lens that scanning patter is used.

Description of drawings:

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

Fig. 2 is an embodiment synoptic diagram of the present utility model.

Embodiment:

As shown in Figure 1, a kind of two aperture diaphragms place the f θ object lens of front end, include two diaphragms 1 and an optical group 2, are characterized in, optical group 2 comprises first, second, third eyeglass, from object space, be expressed as on the figure from top to bottom, first eyeglass 21 is negative crescent, second eyeglass 22 is positive crescent, prismatic glasses 23 is the convexo-plane lens, and its convex surface of three set of contact lenses is the below towards picture side all, and two diaphragms 1 are positioned at the top of first eyeglass 21.Two above-mentioned diaphragms 1 can be used the eyeglass of finite size.Be len, below described prismatic glasses 23, be equipped with the 4th eyeglass 24 of plain film.

In use, two aperture diaphragms are placed the f θ object lens of front end screw in the head 3 of laser machine, as shown in Figure 2.

Claims

1, a kind of two aperture diaphragms place the f θ object lens of front end, include two diaphragms (1) and an optical group (2), it is characterized in that, optical group (2) comprises first, second, third eyeglass, and from object space, first eyeglass (21) is negative crescent, second eyeglass (22) is positive crescent, prismatic glasses (23) is the convexo-plane lens, and its convex surface of three set of contact lenses is all towards picture side, and two diaphragms (1) are positioned at the top of first eyeglass (21).

2, two aperture diaphragms according to claim 1 place the f θ object lens of front end, it is characterized in that, described two diaphragms (1) are the eyeglass of finite size.

3, two aperture diaphragms according to claim 1 place the f θ object lens of front end, it is characterized in that, are equipped with the 4th eyeglass (24) of plain film in the below of described prismatic glasses (23)