CN210499607U

CN210499607U - Device for optical processing and grinding of small-caliber pyramid prism

Info

Publication number: CN210499607U
Application number: CN201920951021.XU
Authority: CN
Inventors: 杨存斌; 闫博; 赵南; 袁祁刚; 贺维
Original assignee: XI'AN NORTH ELECTRO-OPTIC TECHNOLOGY DEFENSE CO LTD
Current assignee: XI'AN NORTH ELECTRO-OPTIC TECHNOLOGY DEFENSE CO LTD
Priority date: 2018-11-06
Filing date: 2018-11-06
Publication date: 2020-05-12
Anticipated expiration: 2028-11-06
Also published as: CN209288925U

Abstract

The utility model belongs to the technical field of optical part precision finishing, a device is used in small-bore pyramid prism optical machining coping is provided, including cube optical cement board, sheet glass and the little parallel plane glass of polylith, sheet glass and cube optical cement board are perpendicular, cube optical cement board optical cement is on sheet glass, and polylith little parallel plane glass evenly distributed is fluted on cube optical cement board and each other. This device uses plate glass and corner prism's optical cement veneer, and the area of processing working face is treated in the increase, makes things convenient for the processing and the polishing of corner prism working face to realize that the optical cement polylith corner prism reaches the purpose that improves production efficiency on plate glass. Has the advantages of improved efficacy, reduced cost, and high qualification rate.

Description

Device for optical processing and grinding of small-caliber pyramid prism

Technical Field

The utility model belongs to the technical field of optical part precision finishing, concretely relates to device is used in small-bore pyramid prism optical processing coping. The present case is the divisional application of utility model patent with application number 2018218159995, application date 11, 6 in 2018.

Background

The corner cube is a tetrahedron composed of three mutually perpendicular working faces, wherein the three mutually perpendicular working faces (also called reflecting faces) have the characteristics of an isosceles triangle, and the bottom face is a working face (incident face) of an equilateral triangle, which has the functions of incident light and reflected light. It is a total internal reflection prism made according to the critical angle principle. The important characteristic of the pyramid prism is that no matter the incident light enters the pyramid prism from the bottom working surface in any direction, after being reflected by the three mutually perpendicular working surfaces in sequence, the emergent light direction and the incident light direction are always kept parallel when the light is still emitted from the bottom working surface, namely, the emergent light rotates 180 degrees relative to the incident light. Because the pyramid prism has the directional reflection characteristic, the acting distance can be obviously increased, and the distance measurement precision can be improved. And are therefore widely used in the resonant cavities of laser rangefinders, laser interferometers, wavemeters and lasers. The method is applied to the technical fields of laser manufacturing, laser irradiation, laser ranging, mapping, building and the like.

In order to increase the energy of the light reflected by the pyramid prism to increase the measurement distance and accuracy of the distance meter, the technical requirements on the pyramid prism are high. That is, the deviation angle error between the incident ray and the emergent ray is required to be

The flatness requirements of the three working surfaces are

Newton rings (aperture). To satisfy

The right angle errors of three mutually perpendicular working faces of the pyramid prism to be processed respectively meet the technical requirements of

I.e. the errors between the three right angles satisfy

. The pyramid prism is divided into two types of large and small calibers according to the maximum inscribed circle diameter of the incident plane. The small-caliber pyramid prism is called as the small-caliber pyramid prism when the incident plane is smaller than phi 40mm, and the large-caliber pyramid prism is called as the large-caliber pyramid prism when the incident plane is larger than phi 40 mm. And the pyramid prism with the incident plane of phi 18mm and the caliber of 15mm from the incident plane to the vertex angle of the pyramid is a high-precision prism, has high measurement precision and has the characteristic of higher processing difficulty.

The processing method of the pyramid prism currently includes the following steps:

1. the separator is used on the polishing machine, a cube with equal side length is ground and polished, the verticality and the planeness of the three working faces of the two groups of the pyramids at the opposite angles meet the technical requirements, then the pyramids are formed and cut, the separator is used on the polishing machine again to grind and polish the incident face, and the included angle between the incident face of the pyramids and the working face of the pyramids and the planeness of the incident face meet the technical requirements. The qualified working surface is easy to generate defects in cutting, and the quality of parts is affected.

2. And (3) putting the working surface of the pyramid prism which is cut and formed into a separator for grinding and polishing, and comparing and measuring by using a 15' single-tube goniometer, aiming at the angle error of the pyramid prism and the included angle error between the incident surface and the working surface. The separator is provided with a mode of mounting the balancing weight on the working surface to be processed, and the included angle error between the incident surface and the working surface and the angle errors of the three working surfaces are corrected to meet the technical requirements. Has the defects of long processing time and low percent of pass.

3. For the small-caliber corner cube prism, the height of the prism is increased to obtain the large mass of the prism, the method 1.2 is conveniently used for processing on a separator, then the corner cube is formed and cut, and the separator is used for grinding and polishing on a polishing machine again, so that the included angle between the incident surface of the corner cube prism and the working surface of the corner cube prism and the flatness of the incident surface meet the technical requirements. There are disadvantages of wasting materials and increasing the production cost of enterprises.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the problem that exists among the prior art, provide a device is used in small-bore pyramid prism optical processing coping.

Therefore, the utility model provides a technical scheme as follows:

the device for optically processing and grinding the small-caliber pyramid prism comprises a cubic optical cement plate, flat glass and a plurality of pieces of small parallel plane glass, wherein the flat glass is perpendicular to the cubic optical cement plate, the cubic optical cement plate is optically cemented on the flat glass, and the plurality of pieces of small parallel plane glass are uniformly distributed on the cubic optical cement plate and are provided with grooves.

The parallelism of the upper surface and the lower surface of the cubic optical cement plate is less than or equal to 1', the flatness of the working surface reaches N =0.5 aperture, and the included angles between the four side surfaces of the cubic optical cement plate and the upper surface and the lower surface are

And the error angle is the same or smaller.

The upper surface of the plate glass is a measuring reference, the lower surface and the four side surfaces are optical cement surfaces, and the flatness of the working surface reaches N =0.5 aperture.

The planeness of the upper working surface and the lower working surface of the plurality of small parallel plane glasses is less than or equal to 0.2 mu m.

The utility model has the advantages that:

the utility model provides a device is used in small-bore pyramid prism optical processing coping uses the optical cement veneer of plate glass and pyramid prism, and the area of processing working face is treated in the increase, makes things convenient for the processing and the polishing of pyramid prism working face to realize that the optical cement polylith pyramid prism reaches the purpose that improves production efficiency on plate glass. Has the advantages of improved efficacy, reduced cost, and high qualification rate.

The following will be described in further detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic view of a structure of a placement film;

FIG. 2 is a schematic structural view of an aluminum outer ring;

FIG. 3 is a cross-sectional view of an embodiment of an apparatus for optical machining of a small-diameter corner cube;

FIG. 4 is a schematic structural diagram of an apparatus for optically polishing a small-diameter pyramid prism;

fig. 5 is a cross-sectional view of an upper disc for grinding unqualified corner cube prisms.

In the figure: 1. pasting a film; 2. a pyramid prism blank; 3. sawdust; 4. an aluminum outer ring; 5. preparing a gypsum cement mixture; 6. an aluminum glue die; 7. a cubic optical cement board; 8. a plate glass; 9. small parallel plane glass; 10. unqualified corner-cube prism; 11. and (4) a locking device.

Detailed Description

Example 1:

this embodiment provides a small-bore pyramid prism device for optical machining, including pasting and putting membrane 1, aluminium system outer lane 4 and aluminium cement mould 6, be equipped with locking device 11 on the aluminium system outer lane 4, 1 circumference of membrane is put along pasting to aluminium system outer lane 4 and is set up and form cylindrical container, cylindrical container intussuseption is filled with gypsum cement modulation thing 5 and forms the gypsum dish, aluminium cement mould 6 is located gypsum dish central authorities and is parallel and level with the gypsum dish. The film 1 is shown in fig. 1, and the aluminum outer ring 4 is shown in fig. 2.

The device is used for processing the first working face of the small-caliber corner cube prism. The using process is as follows:

and (3) opening the locking device 11, taking down the aluminum outer ring 4, and pasting any working surface of the pyramid prism blank 2 on the pasting die (arranged along the circumferential direction), wherein a gap of (2-4) mm is formed between the parts. A layer of sawdust 3 with the thickness of 0.5-1 mm or melted white wax is scattered between the gaps, and then the attaching mold is surrounded by an aluminum outer ring 4 and is fixed by a locking device 11. The cube-corner prism blank 2 (part) is fixed on the gypsum plate by the gypsum cement preparation 5. As shown in fig. 3.

Wherein the gypsum cement mixture 5 comprises gypsum, cement and water, the mass ratio of the gypsum to the cement is 4:1-3:1, and the mass ratio of the mixture of the water and the gypsum cement is 1: 2.

Preparing gypsum and cement according to the proportion of 3:1 or 4:1, uniformly mixing the gypsum and the cement with water, wherein the proportion of the water to be mixed (the gypsum and the cement) is 1:2, pouring the mixture into a cylindrical container with the thickness of 50mm, and finally embedding and placing an aluminum glue mold 6 with the diameter of about 120mm at the center of the plaster tray, wherein the aluminum glue mold 6 is flush with the plaster tray (see figure 2). And (3) placing the aluminum outer ring for 4-8 hours, solidifying the gypsum cement concoction 5, opening the locking manufacture after solidification, and taking down the aluminum outer ring 4. The sawdust 3 between the parts is swept by a brush or the white wax is picked up by a bamboo stick, then the higher gypsum between the parts is removed by the bamboo stick, so that the parts are about 1mm higher than the gypsum plate, and the surface of the gypsum plate parts is cleaned by the brush. The melted yellow wax is coated between the parts and all the surfaces of the gypsum plate, the yellow wax on the parts is scraped by a blade to be lower than the surfaces of the parts, and the parts are wiped clean by dipping cloth in gasoline.

The processing process comprises the following steps: the asphalt polishing mould is arranged on a plane grinder, a gypsum plate fixed with parts (a plurality of parts can be fixed at one time) is cleaned and then is placed on the asphalt polishing mould, and the plane grinder is respectively used for grinding and polishing a first working surface of a pyramid prism by using carborundum (brown corundum) with different brands and meeting the technical requirements. The carborundum of different brands is W28, W14 and W7 respectively.

By using the processing device, the area of the working face to be processed is increased, the processing and polishing of the working face of the pyramid prism are facilitated, and the grinding and processing of a plurality of blocks at one time are realized, so that the optical processing of the small-caliber pyramid prism is facilitated.

Example 2:

the embodiment provides a device for optically grinding a small-caliber angle cone prism, which comprises a cubic optical cement plate 7, a flat glass 8 and a plurality of small parallel plane glasses 9, wherein the flat glass 8 is perpendicular to the cubic optical cement plate 7, the cubic optical cement plate 7 is optically cemented on the flat glass 8, and the plurality of small parallel plane glasses 9 are uniformly distributed on the cubic optical cement plate 7 and are provided with grooves. The groove plays a role in heat dissipation in optical processing and facilitates the flowing of grinding liquid, so that the polishing effect is achieved.

After the working surface of the small-caliber pyramid prism is processed, the working surface needs to be detected, the included angles between the incident surface of the pyramid prism and the three working surfaces are required to be 54 degrees 44' 24 degrees, and the right angle errors of the three mutually vertical working surfaces are respectively met

. And if the detection is unqualified, polishing is required.

As shown in fig. 4, the defective corner cube 10 was polished using the apparatus, and in this example, the small parallel plane glass 9 was nine pieces with a size of (40 × 40 × 2), the cubic optical cement 7 was (140 × 140 × 30), and the plate glass 8 was (140 × 60 × 15).

As shown in fig. 5, the unqualified corner cube 10 is optically glued around the cubic optical cement plate 7, and the other surface of the corner cube is in close contact with the glass plate 8, and interference fringes are generated and are parallel to the edge line of the cubic optical cement plate 7. After the corner cube prism 10 is glued, the rest is coated with protective paint except the processing surface.

The grinding process comprises the following steps: installing a phi 250mm asphalt polishing die on a grinding machine, placing a cubic optical rubber plate 7 with optical rubber shown in figure 5 on the polishing die for direct polishing, measuring the parallelism difference between the surface of a mirror disc and the surface of an optical rubber base plate by using a dial indicator in the polishing process to be less than 0.0005mm, detecting the flatness N =0.25 Newton ring of a prism by using an interferometer, detecting the surface of a part to be free of defects by using a magnifier, knocking the part down by using a wood hammer after the technical conditions of part processing are met, wiping the part clean by using absorbent cotton dipped in alcohol, detecting the right angle error of the corner cone prism by using a Taeman interferometer, and enabling the flatness of three working surfaces to meet the requirements of the flatness of the three working surfaces

Newton rings (aperture). Then satisfy

Namely, the right angle errors of three mutually perpendicular working faces of the pyramid prism to be processed respectively meet the requirements

Or

。

After polishing, every two of the three reflecting working surfaces of the pyramid prism are mutually vertical, and the included angle between the incident working surface and the three reflecting working surfaces is 54 degrees, 44' 24 ". The vertex from the working face to the corner cube prism is 15mm, the incident face is smaller than the small-caliber corner cube prism with phi 40mm, if the three processing methods mentioned in the background technology are used, the defects of great waste, long processing time and low qualified rate exist.

The optical cement veneer of plate glass 8 and corner cube prism is used to this embodiment, and the area of processing working face is treated in the increase, makes things convenient for the processing and the polishing of corner cube prism working face to realize the optical cement polylith corner cube prism on plate glass 8, reach the purpose that improves production efficiency. Has the advantages of improved efficacy, reduced cost, and high qualification rate.

The above examples are merely illustrative of the present invention and do not limit the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention.

Claims

1. Device for optical processing coping of small-bore pyramid prism, its characterized in that: the novel flat glass comprises a cube optical cement plate (7), flat glass (8) and a plurality of small parallel plane glasses (9), wherein the flat glass (8) is perpendicular to the cube optical cement plate (7), the cube optical cement plate (7) is optically cemented on the flat glass (8), and the plurality of small parallel plane glasses (9) are uniformly distributed on the cube optical cement plate (7) and are mutually provided with grooves.

2. The device for optically processing and grinding the small-caliber corner cube prism according to claim 1, wherein the parallelism of the upper and lower surfaces of the cubic optical cement plate (7) is less than or equal to 1 ", the flatness of the working surface reaches N =0.5 diaphragm, the included angle between the four side surfaces of the cubic optical cement plate (7) and the upper and lower surfaces is △ 90 degrees to 0.5", and the error angle is equal to larger or smaller.

3. The device for optically processing and grinding the small-caliber corner-cube prism according to claim 1, wherein: the upper surface of the plate glass (8) is a measuring standard, the lower surface and four side surfaces are optical cement surfaces, and the flatness of the working surface reaches N =0.5 aperture.

4. The device for optically processing and grinding the small-caliber corner-cube prism according to claim 1, wherein: the planeness of the upper working surface and the lower working surface of the plurality of small parallel plane glasses (9) is less than or equal to 0.2 mu m.