CN117047608B

CN117047608B - Processing method of trapezoid optical prism

Info

Publication number: CN117047608B
Application number: CN202310898175.8A
Authority: CN
Inventors: 李文强
Original assignee: Beijing Trans Manufacture And Trade Co ltd
Current assignee: Beijing Trans Manufacture And Trade Co ltd
Priority date: 2023-07-20
Filing date: 2023-07-20
Publication date: 2024-06-28
Anticipated expiration: 2043-07-20
Also published as: CN117047608A

Abstract

The invention relates to the technical field of optical part processing, and provides a processing method of a trapezoid optical prism, which comprises the following steps: annealing the blank corresponding to the optical prism; based on the optical cement disc, disc forming grinding and disc forming polishing are carried out on a plurality of blanks for a plurality of times, and an S3 surface, an S2 surface, an S1 surface and an S4 surface on the optical prism are sequentially obtained; annealing the optical prism subjected to the disc forming frosting and the disc forming polishing in sequence, and repairing the surface shape and the angle; wherein, at the in-process of carrying out the dish dull polish and the dish polishing of becoming to a plurality of blanks at every turn, still be provided with a plurality of joining in marriage the dish on the optical cement dish, a plurality of joining in marriage the dish setting between a plurality of blanks, a plurality of joining in marriage the dish and a plurality of blanks all are central symmetry setting for the center of optical cement dish. The processing method of the trapezoid optical prism not only eliminates the residual stress in the blank, but also ensures that the stress of the blank is more balanced in the polishing process, so that the polishing effect is better, and the processing quality of the trapezoid optical prism is ensured.

Description

Processing method of trapezoid optical prism

Technical Field

The invention relates to the technical field of optical part processing, in particular to a processing method of a trapezoid optical prism.

Background

The trapezoidal optical prism is generally used for turning an optical path or deflecting an image formed by an optical system by 90 degrees, the incident light of the trapezoidal optical prism has different directions, the image can be consistent from left to right and inverted from top to bottom or different from left to right and consistent from top to bottom, and the trapezoidal optical prism can also be used in application fields of image combination, light beam deflection and the like.

At present, the cold working is mainly carried out on the trapezoidal optical prism, the working efficiency is low, the internal residual stress generated by structural change of the trapezoidal optical prism in the working process cannot be comprehensively eliminated, so that the accuracy of the surface shape and the angle is unqualified, in the subsequent film plating process, the residual stress of the trapezoidal optical prism also can cause uncontrollable surface shape change quantity and out-of-tolerance range of a product, in the polishing process of the cold working, the cutting force born by the trapezoidal optical prism is unbalanced, the accuracy of the surface shape and the angle processing of the trapezoidal optical prism can be influenced, and the processing quality of the trapezoidal optical prism is difficult to guarantee.

Disclosure of Invention

The invention provides a processing method of a trapezoid optical prism, which is used for solving the problems that the existing trapezoid optical prism has low processing efficiency and is difficult to ensure processing quality.

The invention provides a processing method of a trapezoid optical prism, which comprises the following steps:

annealing the blank corresponding to the optical prism;

Based on the optical cement disc, disc forming grinding and disc forming polishing are carried out on a plurality of blanks for a plurality of times, and an S3 surface, an S2 surface, an S1 surface and an S4 surface on the optical prism are sequentially obtained;

Annealing the optical prism subjected to the disc forming frosting and the disc forming polishing in sequence, and repairing the surface shape and the angle;

Wherein, at the in-process of carrying out the dish dull polish and the dish polishing of becoming to a plurality of blanks at every turn, still be provided with a plurality of joining in marriage the dish on the optical cement dish, a plurality of joining in marriage the dish setting between a plurality of blanks, a plurality of joining in marriage the dish and a plurality of blanks all are central symmetry setting for the center of optical cement dish.

According to the processing method of the trapezoid optical prism, the matched disc comprises a first matched disc and a second matched disc, and the processing of the S3 surface on the optical prism comprises the following steps:

the bottom surface of the first distribution plate is subjected to optical cement on the top surface of the cuboid part to form a first optical cement piece;

Symmetrically arranging a plurality of first optical glued pieces on the optical glue disc to ensure that the bottom surface of the cuboid part is optically glued on the optical glue surface of the optical glue disc;

bonding the second surface to be processed of the blank with the first side surface of the cuboid part corresponding to each first optical bonding piece, and ensuring that the top surface of the first distribution plate is flush with the first surface to be processed of the blank and is parallel to the optical bonding surfaces;

a plurality of second distribution discs are arranged between the plurality of first optical cementing pieces and on the optical cement surface corresponding to the outer sides of the plurality of first optical cementing pieces;

and sequentially performing disc forming grinding, disc forming polishing and surface shape repairing on the first surface to be processed of the blank to obtain an S3 surface on the blank.

According to the processing method of the trapezoid optical prism, a plurality of first distribution plates are arranged, and the plurality of first distribution plates are sequentially arranged along the length direction of the cuboid part.

According to the processing method of the trapezoid optical prism, the matched disc comprises a first matched disc and a second matched disc, and the processing of the S2 surface on the optical prism comprises the following steps:

The S3 surface optical cement obtained by processing the blank is glued on the first side surface of the cuboid part corresponding to each first optical cementing piece, so that the top surface of the first distribution plate and the second surface to be processed of the blank are flush, and are parallel to the optical cement surfaces;

And sequentially carrying out disc forming frosting and disc forming polishing on the second surface to be processed of the blank to obtain an S2 surface on the blank.

According to the processing method of the trapezoid optical prism, the matched disc comprises a second matched disc, and the processing of the S1 surface on the optical prism comprises the following steps: the S3 surface light glue processed on the blank is coated on the first light glue surface on the 45-degree backing plate, so as to form a second optical glued piece;

symmetrically arranging a plurality of second optical cementing pieces on the optical cement disc, and ensuring that the second optical cement surface on the 45-degree backing plate is optically cemented on the optical cement surface of the optical cement disc;

A plurality of second distribution discs are arranged between the plurality of second optical cementing pieces and on the optical cement surface corresponding to the outer sides of the plurality of second optical cementing pieces;

And sequentially carrying out disc forming frosting and disc forming polishing on the third surface to be processed of the blank to obtain an S1 surface on the blank.

According to the processing method of the trapezoid optical prism, the matched disc comprises a third matched disc, and the step of processing the S4 surface on the optical prism comprises the following steps: symmetrically arranging a plurality of blanks on a photoresist disc, and ensuring that the S2 surface photoresist is processed on the blanks on the photoresist surface of the photoresist disc;

A plurality of third matching discs are prepared by polishing the photoresist surfaces corresponding to the outer sides of the blanks;

and (3) carrying out disc-forming frosting on the fourth surface to be processed of the blank so as to obtain an S4 surface on the blank.

According to the processing method of the trapezoid optical prism, provided by the invention, based on the optical cement disc, disc forming polishing is carried out on two blanks for multiple times, and the S3 surface, the S2 surface, the S1 surface and the S4 surface on the optical prism are sequentially obtained;

In the S4 surface processing process, the two blanks are arranged in parallel, and S1 surfaces on the two blanks are arranged oppositely.

According to the processing method of the trapezoid optical prism, which is provided by the invention, the steps of repairing the surface shape and the angle of the optical prism after disc polishing are carried out, and the processing method comprises the following steps: performing surface shape repair on the S1 surface on the optical prism;

the step of performing surface shape repair on the S1 surface on the optical prism comprises the following steps:

placing the optical prism in a limiting hole of the ring polishing spacer ring to ensure that the S1 surface on the optical prism is attached to the polishing table;

The optical prism is embedded in a V-shaped groove of the single-pull tool, so that the S2 surface on the optical prism is attached to the first groove wall of the V-shaped groove, and the S3 surface on the optical prism is attached to the second groove wall of the V-shaped groove;

arranging a first pressing block on the top surface of the single-pull tool;

and starting the surface shape repairing equipment to repair the surface shape of the S1 surface.

According to the processing method of the trapezoid optical prism, which is provided by the invention, the steps of repairing the surface shape and the angle of the optical prism after disc polishing are carried out, and the processing method comprises the following steps: performing angle repair on the 45-degree angle on the optical prism;

the step of performing angle repair at a 45 ° angle on the optical prism includes:

placing the two optical prisms in the same limiting hole of the ring polishing spacer ring, and ensuring that the S1 surfaces of the two optical prisms are attached, and the S2 surface of one of the two optical prisms is attached to the polishing table;

The second pressing block is arranged on the S2 surface of the other one of the two optical prisms;

And starting the surface shape repairing equipment to repair the surface shape of the S2 surface so as to repair the angle of 45 degrees on the optical prism.

The processing method of the trapezoid optical prism provided by the invention further comprises the following steps: performing manual repair on the S1 surface shape on the optical prism;

the step of manual repair comprises the following steps: acquiring a surface shape diagram of an S1 surface on an optical prism;

marking unqualified surface shape positions on the S1 surface according to the surface shape graph;

And wiping the surface-shaped position.

According to the processing method of the trapezoid optical prism, firstly, annealing treatment is carried out on blanks, then disc forming grinding and disc forming polishing are carried out on a plurality of blanks on an optical rubber disc for many times, an S3 face, an S2 face, an S1 face and an S4 face of the optical prism are sequentially obtained, and finally, annealing treatment and surface shape and angle repair are sequentially carried out on the optical prism subjected to disc forming grinding and disc forming polishing, so that the optical prism with qualified precision is obtained; in the process of processing the trapezoid optical prism, the blank is subjected to two-wheel annealing treatment before and after polishing, residual stress in the blank is eliminated, and in the polishing process, the plurality of distribution plates and the plurality of blanks are arranged in central symmetry relative to the center of the optical plastic plate, so that the stress of the blank in the polishing process is more balanced, the processing efficiency is improved, the accuracy of processing the surface shape and the angle of the trapezoid optical prism is ensured, and the processing quality of the trapezoid optical prism is ensured.

Drawings

In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic flow chart of a processing method of a trapezoidal optical prism provided by the invention;

FIG. 2 is a flow chart of the steps for processing the S3 surface on the optical prism provided by the invention;

FIG. 3 is a flow chart of the steps for processing the S2 surface on the optical prism provided by the invention;

FIG. 4 is a schematic flow chart of the steps for processing the S1 surface on the optical prism;

FIG. 5 is a schematic flow chart of the steps for processing the S4 surface on the optical prism;

FIG. 6 is a flow chart of the steps for performing surface shape repair on the S1 surface of the optical prism provided by the invention;

FIG. 7 is a flow chart of the steps for performing an angle repair at a 45 angle on an optical prism provided by the present invention;

FIG. 8 is a schematic flow chart of a step of performing hand repair on the S3, S2, S1 and S4 surfaces of an optical prism according to the present invention;

FIG. 9 is a schematic view of the structure of the optical prism for processing the S3 surface;

FIG. 10 is a schematic view of the structure of the optical prism for processing the S2 surface;

FIG. 11 is a schematic view of a second optical cement provided by the present invention;

FIG. 12 is a schematic view of the structure of the optical prism for processing the S1 surface;

FIG. 13 is a schematic view of the structure of the optical prism for processing the S4 surface;

FIG. 14 is a schematic view of the structure of the optical prism for surface shape repair of the S1 surface;

FIG. 15 is a schematic view of an angle repair of a 45 degree angle on an optical prism provided by the present invention;

FIG. 16 is a schematic view of an optical prism according to the present invention;

FIG. 17 is a schematic view of the structure of a blank provided by the present invention;

FIG. 18 is a schematic view of a 45℃pad provided by the present invention;

FIG. 19 is a schematic view of a first tray according to the present invention;

FIG. 20 is a schematic view of a second tray according to the present invention;

FIG. 21 is a schematic view of a third tray according to the present invention;

FIG. 22 is a schematic view of the structure of a rectangular parallelepiped part provided by the present invention;

Fig. 23 is a schematic structural diagram of an optical disc according to the present invention.

Reference numerals:

1. an optical prism; 2. blank; 3. a photoresist plate; 4. a first distribution plate; 5. a second distribution plate; 6. a third distribution plate; 7. a rectangular parallelepiped part; 8. a 45-degree backing plate;

9. Ring polishing space rings; 91. a limiting hole;

11. A single-pull tool; 111. a V-shaped groove; 1111. a first groove wall; 1112. a second groove wall;

12. a first briquette; 13. A second briquetting;

101. A first optical cement; 102. A second optical cement;

H1, a first surface to be processed of the blank; h2, a second surface to be processed of the blank; h3, a third surface to be processed of the blank; h4, a fourth surface to be processed of the blank;

m1, a photoresist surface of a photoresist disk; m2, the bottom surface of the optical cement disc;

P1, the bottom surface of the first tray; p2, the top surface of the first distribution plate;

t1, the bottom surface of the second distribution plate; w1, the bottom surface of the third distribution plate;

O1, the top surface of the cuboid part; o2, the bottom surface of the cuboid part; o3, a first side surface of the cuboid part; o4, the second side surface of the cuboid part;

R1, a first photoresist surface of a 45-degree backing plate; r2, a second photoresist surface of the 45-degree backing plate; r3 and a first right-angle surface of the 45-degree backing plate; and R4, a third photoresist surface of the 45-degree backing plate.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The following describes in detail a processing method of the trapezoidal optical prism according to the embodiment of the present invention by referring to fig. 1 to 23 through specific embodiments and application scenarios thereof.

In some embodiments, as shown in fig. 1, 9, 10, 12, 13 and 17, the present embodiment provides a method for processing a trapezoidal optical prism, including the following steps:

Step 111, annealing the blank 2 corresponding to the optical prism 1.

It can be understood that when the blank 2 is annealed, the blank 2 is first put into an oven, the oven temperature is set to 200 ℃, then the oven is gradually heated to 200 ℃, the blank 2 is baked for 2 hours at 200 ℃, and finally the blank 2 is naturally cooled to room temperature, and 4 times of annealing operations are performed on the blank 2 according to the annealing process.

Before the blank 2 is processed into the optical prism 1, residual stress caused by processing exists in the blank 2, and the annealing treatment of the blank 2 can further eliminate the stress and avoid the surface shape change caused by the residual stress.

Step 112, based on the optical cement disc 3, disc forming grinding and disc forming polishing are performed on the blanks 2 for a plurality of times, and an S3 face, an S2 face, an S1 face and an S4 face on the optical prism 1 are sequentially obtained.

It can be understood that, using the optical disc 3 as a reference, using polishing solution cerium oxide, the first surface H1 to be processed, the second surface H2 to be processed, the third surface H3 to be processed, and the fourth surface H4 to be processed of the blank 2 are sequentially polished in a disc manner, and the processed surfaces can be used as references of subsequent surfaces to be processed, so that the S3 surface, the S2 surface, the S1 surface, and the S4 surface on the optical prism 1 are sequentially obtained, and the blank 2 is processed by using disc polishing, so that the processing efficiency of each surface can be ensured, and the processed surfaces meeting the surface shape and angle requirements can be obtained.

Step 113, annealing the optical prism 1 after the polishing of the disk and the polishing of the disk in turn, and repairing the surface shape and the angle.

It can be understood that the optical prism 1 after disc polishing has structural change caused by cutting in the processing process, residual stress is introduced, the annealing process in the step 111 needs to be repeated again to release the stress in the optical prism 1, the processing method belongs to the cold processing stage, the optical prism 1 needs to be coated after cold processing, and the annealing process can avoid uncontrollable surface shape change amount and out-of-tolerance of surface shape and angle after the optical prism 1 is coated due to the introduction of the residual stress.

Wherein, in the process of carrying out the lapping sand and the lapping polishing of the dish to a plurality of blanks 2 at every turn, still be provided with a plurality of joining in marriage the dish on optical cement dish 3, a plurality of joining in marriage the dish setting between a plurality of blanks 2, a plurality of joining in marriage the dish and a plurality of blanks 2 all are central symmetry setting for the center of optical cement dish 3.

The matched disc is a part for assisting in disc forming processing during product processing, and the matched disc is made of the same material as the blank 2 and can be processed together with the blank 2.

The multiple blanks 2 symmetrically arranged can be used for processing the multiple blanks 2 at a time, so that the processing efficiency is improved, the processing cost is reduced, the blanks 2 and the distribution plate are symmetrically arranged, and the stress of the blanks 2 and the distribution plate is more balanced during polishing, so that the polishing precision of each surface on the trapezoid optical prism 1 is more favorably ensured.

According to the processing method of the trapezoid optical prism, firstly, annealing treatment is carried out on blanks 2, then disc forming grinding and disc forming polishing are carried out on a plurality of blanks 2 on an optical rubber disc 3, an S3 face, an S2 face, an S1 face and an S4 face of the optical prism 1 are sequentially obtained, and finally, annealing treatment and surface shape and angle repairing are carried out on the optical prism 1 subjected to disc forming grinding and disc forming polishing in sequence, so that the optical prism 1 with qualified precision is obtained; in the process of processing the trapezoid optical prism 1, the blank 2 is subjected to two-wheel annealing treatment before and after polishing, so that residual stress in the blank 2 is eliminated, and in the polishing process, a plurality of distribution plates and a plurality of blanks 2 are arranged in a central symmetry mode relative to the center of the optical cement plate 3, so that the stress of the blank 2 is more balanced in the polishing process, the processing efficiency is improved, the accuracy of processing the surface shape and the angle of the trapezoid optical prism 1 is ensured, and the processing quality of the trapezoid optical prism 1 is ensured.

In some embodiments, as shown in fig. 2 and 9, the mating disc of the present embodiment includes a first mating disc 4 and a second mating disc 5, and the step of processing the S3 surface on the optical prism 1 includes:

Step 211, photo-curing the bottom surface P1 of the first mating disc 4 on the top surface O1 of the rectangular parallelepiped element 7 to form the first optical bonding element 101.

It is understood that the first optical bonding member 101 refers to a bonding member formed by photo-bonding the first mating disc 4 and the rectangular parallelepiped part 7 together. As shown in fig. 19, the first tray 4 is an optical part having a top surface P2 and a bottom surface P1, the top surface P2 and the bottom surface P1 being disposed in parallel; as shown in fig. 22, the rectangular parallelepiped part 7 is an optical part in the shape of a rectangular parallelepiped for duplicating the perpendicularity between the surfaces of the part, and can be reused in the processing.

Before the photoresist, the bottom surface P1 of the first distribution plate 4 and the top surface O1 of the cuboid part 7 are required to be pre-processed based on the requirements of a photoresist process, so that the surface shape and the error of the photoresist surface reach a certain precision, the bottom surface P1 of the first distribution plate 4 and the top surface O1 of the cuboid part 7 are required to be wiped clean before the photoresist, the photoresist surface is smooth, and the photoresist operation is convenient.

The bottom surface P1 of the first distribution plate 4 is optically glued to the top surface O1 of the cuboid part 7, and glue is coated on four edges of the bottom surface P1 of the first distribution plate 4 on the joint surface of the bottom surface P1 of the first distribution plate 4 and the top surface O1 of the cuboid part 7, so that the joint between the first distribution plate 4 and the cuboid part 7 is firmer.

Wherein the glue may be 417 glue.

In step 212, the plurality of first optical bonding members 101 are symmetrically disposed on the optical cement disc 3, so as to ensure that the bottom surface O2 of the rectangular part 7 is optically glued on the optical cement surface M1 of the optical cement disc 3.

In this embodiment, two first optical bonding members 101 are symmetrically disposed on the optical disc 3, and the bottom surface O2 of the rectangular part 7 is optically bonded to the optical adhesive surface M1 of the optical disc 3.

Step 213, bonding the second surface H2 to be processed of the blank 2 with the first side surface O3 of the cuboid part 7 corresponding to each first optical bonding member 101, so as to ensure that the top surface P2 of the first matching disc 4 and the first surface H1 to be processed of the blank 2 are flush and parallel to the optical bonding surface M1.

It is understood that rosin wax is formed by mixing rosin and white wax in a ratio of 1:1, and can be used for bonding optical parts.

Because the precision of the second surface to be processed of the blank 2 still cannot meet the technological requirement of the photoresist, only the bonding method can be used for fixing the second surface to be processed H2 of the blank 2 and the first side surface O3 of the cuboid part 7. In this embodiment, rosin wax is used as an adhesive to bond the second surface H2 to be processed of the blank 2 and the first side surface O3 of the rectangular parallelepiped part 7 together.

In this embodiment, by setting the top surface P2 of the first matching disc 4 and the first surface H1 to be processed of the blank 2 to be flush, and both the surfaces are parallel to the photoresist surface M1, the first surface H1 to be processed of the blank 2 and the top surface P2 of the first matching disc 4 are convenient to perform polishing operation together.

Step 214, a plurality of second matching discs 5 are glazed on the photoresist surface M1 corresponding to the outer sides of the plurality of first optical bonding members 101 and between the plurality of first optical bonding members 101.

In this embodiment, twelve second distributing discs 5 and two first optical bonding members 101 are disposed, six second distributing discs 5 are uniformly glued on a straight line passing through the center of the optical cement disc 3, two first optical bonding members 101 are respectively glued on two sides of the straight line passing through the center of the optical cement disc 3, the length direction of each first optical bonding member 101 is parallel to the arrangement direction of the six second distributing discs 5, the distance between the opposite end surfaces of each first optical bonding member 101 and each second distributing disc 5 is about 5mm, so that cerium oxide polishing solution can better dissipate heat based on the gap, then the six second distributing discs 5 are uniformly glued on the outer sides of the two first optical bonding members 101, and finally edges of the optical cement disc 3, the second distributing discs 5, the cuboid parts 7 and the optical cement disc 3 are sealed and reinforced by glue.

The glue used for edge sealing can be 417 glue.

Step 215, sequentially performing disc forming grinding, disc forming polishing and surface shape repairing on the first surface H1 to be processed of the blank 2 to obtain an S3 surface on the blank 2.

It can be understood that, first, the first surface H1 to be processed of the blank 2 is subjected to disc polishing, 280# sand is used for polishing the first surface H1 to be processed of the blank to 34.05mm, 303# sand with the model of W14 is used for polishing 0.05mm, 303.5# sand with the model of W10 is used for controlling the disc error Δt to be less than or equal to 0.005, and 33.97mm (the right-angle side dimension of the blank 2 is 33mm plus or minus 0.1 mm).

Secondly, the first surface H1 to be processed of the blank 2 is polished in a disc manner, firstly, the blank 2 is polished in a disc manner to ensure that the F-number N is less than or equal to 3fr, the first optical bonding part 101 and the blank 2 are detached from the optical bonding disc 3 after being heated by a hot air gun, and the second distribution disc 5 is soaked by acetone and then is put down.

The first optical bonding element 101, namely the combination of the second matching disk 5 and the cuboid part 7, is not split during the process of taking down the disk, and is reserved for the next step as a whole.

Because the first surface H1 to be processed of the blank 2 is bonded by rosin wax, the blank 2 is in a stressed state due to the tensile force of the rosin wax, and the rear surface of the lower disc of the blank 2 can be concave, the surface shape of a single piece part is repaired after the blank 2 is put down, and the surface shape PV of the S3 surface is less than 0.5 mu m (N is less than 1.57 fr).

And after the blank 2 and the second matched disc 5 are placed down, cleaning the blank 2 and the second matched disc 5 by using an acetone and alcohol mixed solution, and cleaning glue on the blank 2 and the second matched disc 5.

In some embodiments, as shown in fig. 9, a plurality of first matching trays 4 are provided in the present embodiment, and the plurality of first matching trays 4 are sequentially arranged along the length direction of the rectangular parallelepiped part 7.

It can be understood that in the polishing process of the optical part, the ratio of the area of the processing surface of the optical part to the area of the optical disc 3 needs to meet the requirement of 0.6, and in the case of insufficient area of the optical disc 3, the first matching disc 4 made of the same material as the optical part needs to be added to assist in disc forming processing.

In this embodiment, by arranging a plurality of first matching discs 4, the processing area of the blank 2 and the area of the matching discs meet the polishing requirement, which is more beneficial to ensuring the polishing precision of the trapezoidal optical prism 1.

In this embodiment, three first matching discs 4 are arranged on one cuboid part 7.

In some embodiments, as shown in fig. 3 and 10, the mating disc includes a first mating disc 4 and a second mating disc 5, and the step of processing the S2 surface on the optical prism 1 in this embodiment includes:

In step 311, the plurality of first optical bonding members 101 are symmetrically disposed on the optical cement disc 3, so as to ensure that the bottom surface O2 of the rectangular part 7 is optically glued on the optical cement surface M1 of the optical cement disc 3.

It can be understood that the first optical bonding pieces 101 obtained in the step 215 are used in the step 311, and in this embodiment, the two first optical bonding pieces 101 are symmetrically disposed on the optical disc 3, and the bottom surface O2 of the rectangular part 7 is optically bonded to the optical adhesive surface M1 of the optical disc 3.

Step 312, the S3-side optical cement obtained by processing the blank 2 is applied to the first side O3 of the cuboid part 7 corresponding to each first optical cement piece 101, so as to ensure that the top surface P2 of the first tray 4 and the second surface H2 to be processed of the blank 2 are flush and parallel to the optical cement surface M1.

It will be appreciated that since the first surface H1 to be processed of the blank 2 has been processed into the S3 surface in step 215, the accuracy of the S3 surface meets the requirements of the photo-glue process, and the photo-glue method may be used to fix the S3 surface and the first side O3 of the cuboid part 7.

In this embodiment, the top surface P2 of the first matching disc 4 and the second surface H2 to be processed of the blank 2 are flush and are parallel to the photoresist surface M1, so that the second surface H2 to be processed of the blank 2 is fixed in a pose convenient for processing.

Step 313, a plurality of second matching discs 5 are glazed on the corresponding light glue surfaces M1 of the outer sides of the plurality of first optical bonding members 101 and between the plurality of first optical bonding members 101.

The glue used for edge sealing can be 417 glue.

Step 314, sequentially performing disc-forming frosting and disc-forming polishing on the second surface H2 to be processed of the blank 2 to obtain an S2 surface on the blank 2.

It can be understood that, first, the second surface H2 to be processed of the blank 2 is subjected to disc polishing, 280# sand is used for polishing the second surface H2 to be processed of the blank 2 to 42.19mm, 303# sand with the model number of W14 is used for polishing 0.05mm, 303.5# sand with the model number of W10 is used for controlling the disc error Δt to be less than or equal to 0.005, and the disc error Δt is polished to 42.06mm.

Secondly, performing disk forming polishing on a second surface H2 to be processed of the blank 2, wherein the disk forming polishing is divided into disk forming high polishing and disk forming ring polishing, firstly, performing disk forming high polishing on the blank 2 to ensure that the aperture number N is less than or equal to 3fr, and then performing disk forming ring polishing on the blank 2, wherein no sand holes are required, the surface shape N is less than or equal to 2fr, the disk forming control verticality is less than or equal to 15 ', and the disk forming control parallelism is less than or equal to 10'.

The first optical bonding part 101 is knocked down, the blank 2 and the cuboid part 7 are heated by a hot air gun, the blank 2 is disassembled, and the second distribution plate 5 is soaked by acetone and then is down.

At this time, the S2 surface shape is required to be less than 0.5 μm (N is less than 1.57 fr), the right angle surface shape is required to be less than 0.002 μm (N is less than 6.3 fr), the verticality of the disk forming control is less than or equal to 15', and whether the surface shape and the angle need to be finished can be judged according to the situation.

In some embodiments, as shown in fig. 4 and 12, the mating disc of the present embodiment includes a second mating disc 5, and the step of processing the S1 surface on the optical prism 1 includes:

In step 411, the S3 surface of the blank 2 is glued to the first glue surface R1 of the 45 ° backing plate 8 to form the second optical glue 102.

It is understood that the second optical glue 102 refers to a glue that is formed by light gluing together the blank 2 and the 45 ° shim plate 8. The 45-degree backing plate 8 is a tool for copying the angle of the part, and the angle precision can reach the second level.

Before the S3 surface of the blank 2 and the first photoresist surface R1 of the 45-degree backing plate 8 are subjected to photoresist, the first photoresist surface R1 needs to be pre-processed based on the requirements of a photoresist process so that the surface shape and the error of the photoresist surface reach a certain precision, the S3 surface of the blank 2 and the first photoresist surface R1 of the 45-degree backing plate 8 need to be cleaned before photoresist, the photoresist surface is smooth, and the photoresist operation is convenient.

As shown in fig. 11, in order to glue the S3 surface machined on the blank 2 onto the first glue surface R1 on the 45 ° backing plate 8, the third glue surface R4 of the 45 ° backing plate 8 is first stuck to the glue surface M1 of the glue plate 3 with reference to the glue surface M1 of the glue plate 3 until a stripe is seen, then the S2 surface of the blank 2 is stuck to the glue surface M1 of the glue plate 3 until a stripe is seen, at this time, the first glue surface R1 of the 45 ° backing plate 8 is stuck to the S3 surface of the blank 2 and compacted, and the 45 ° backing plate 8 and the blank 2 are glued together to form the second optical glue 102, and at the same time, the third glue surfaces R4 of the S2 surface and the 45 ° backing plate 8 are both made to have aperture fringes, so as to ensure that the blank 2 is flush with the 45 ° backing plate 8.

In step 412, the plurality of second optical bonding members 102 are symmetrically disposed on the optical disc 3, so as to ensure that the second optical adhesive surface R2 on the 45 ° backing plate 8 is optically adhered to the optical adhesive surface M1 of the optical disc 3.

In this embodiment, two second optical bonding members 102 are disposed, and the two second optical bonding members 102 are disposed on the optical adhesive surface at intervals, and the two second optical bonding members 102 are disposed axisymmetrically with respect to a straight line passing through the center of the optical adhesive disc 3, so as to ensure that the second optical adhesive surface R2 on the 45 ° backing plate 8 is optically adhered to the optical adhesive surface M1 of the optical adhesive disc 3.

Step 413, a plurality of second matching discs 5 are glazed on the photoresist surface M1 corresponding to the outer sides of the plurality of second optical bonding members 102 and between the plurality of second optical bonding members 102.

In this embodiment, twelve second distribution plates 5 and two second optical bonding members 102 are provided, six second distribution plates 5 are uniformly glued on the central line of the glue surface M1 of the glue plate 3, two second optical bonding members 102 are respectively glued on two sides of the central line, the length direction of each second optical bonding member 102 is parallel to the arrangement direction of the six second distribution plates 5, and the distance between the opposite end surfaces of each second optical bonding member 102 and each second distribution plate 5 is about 5mm, so that cerium oxide polishing solution can better dissipate heat based on the distance, then the uniform glue of the six second distribution plates 5 is arranged on the outer sides of the two second optical bonding members 102, finally glue is used for sealing edges of the cuboid part 7, the second distribution plates 5 and the glue plate 3, waterproof glue is coated, and the glue is dried by a blower for one hour.

The glue used for edge sealing can be 417 glue.

In step 414, the third surface H3 to be processed of the blank 2 is sequentially subjected to disc forming and polishing to obtain the S1 surface on the blank 2.

It can be understood that, first, the third surface H3 to be processed of the blank 2 is disk-polished, 280# sand is used to polish the third surface H3 to be processed of the blank 2 to 34.05mm, 303# sand with the model of W14 is used to polish 0.05mm, 303.5# sand with the model of W10 is used to control the disk error Δt to be less than or equal to 0.005, and 33.97mm (the square edge size of the blank 2 is 33mm + -0.1 mm).

Secondly, performing disk forming polishing on a third surface H3 to be processed of the blank 2, wherein the disk forming polishing is divided into disk forming high polishing and disk forming ring polishing, firstly, performing disk forming high polishing on the blank 2 to ensure that the aperture number N is less than or equal to 6fr, then performing disk forming ring polishing on the blank 2 to ensure that the angle error between the S2 surface and the S1 surface is 45+/-3 ', the disk forming control parallelism is less than or equal to 2', the surface shape requirement is that PV is less than 50nm (N is less than 0.157 fr) in any 30mm multiplied by 50mm area, and the effective clear aperture diameter D0 is more than or equal to 290 multiplied by 30mm and N is less than 4.3fr in the area.

Knocking the blank 2 and the 45-degree backing plate 8 on the lower disc, heating the blank 2 and the 45-degree backing plate 8 by using a hot air gun, removing the blank 2, soaking the second matched disc 5 by using acetone, and then putting the lower disc.

The dimensions, shape and angle of the blank 2 are checked.

In some embodiments, as shown in fig. 5 and 13, the mating disc of the present embodiment includes a third mating disc 6, and the step of processing the S4 surface on the optical prism 1 includes:

In step 511, the blanks 2 are symmetrically disposed on the optical disc 3, so as to ensure that the S2-side optical disc 3 is processed on the blank 2.

It can be understood that, before the photoresist, the S2 surface of the blank 2 and the photoresist surface M1 of the photoresist disc 3 need to be pre-processed based on the requirements of the photoresist process, so that the surface shape and the error of the photoresist surface reach a certain precision, and the blank 2 needs to be wiped clean before the photoresist, so that the photoresist surface is smooth, and the photoresist operation is convenient.

In this embodiment, two blanks 2 are symmetrically arranged on the optical disc 3, so that the S2 surface of each blank 2 is optically glued on the optical glue surface M1 of the optical disc 3, and the distance between the two blanks 2 is 15mm.

And step 512, polishing the photoresist surface M1 corresponding to the outer sides of the blanks 2 with a plurality of third matched discs 6.

In this embodiment, seven third matching discs 6 are respectively formed on the optical cement surface M1 corresponding to the outer sides of the two blanks 2, four of the three third matching discs 6 are sequentially arranged along the length direction of the blanks 2, the other three third matching discs 6 are arranged on the outer sides of the optical cement discs 3, the distance between the third matching discs 6 is 5mm, and after finishing the optical cement on the optical cement discs 3, the fourteen third matching discs 6 are coated with waterproof glue.

And 513, performing disc grinding on the fourth surface H4 to be processed of the blank 2 to obtain an S4 surface on the blank 2.

It can be understood that the fourth surface H4 to be processed of the blank 2 is subjected to disc grinding, 280# sand is firstly used for grinding the fourth surface H4 to be processed of the blank 2 to 24.23mm, 303# sand with the model number of W14 is used for grinding 0.1mm, 303.5# sand with the model number of W10 is used for controlling the disc error Δt to be less than or equal to 0.005, and the disc error Δt is ground to (24.1-0.05) mm (the right-angle side dimension of the blank 2 is 24mm plus or minus 0.1 mm).

The blank 2 is knocked down.

The blank 2 and the third matched plate 6 are cleaned by the mixed solution of acetone and alcohol after being put down.

The S4 face size, part face shape and angle of the blank 2 were checked.

The blank 2 is coated with a water-repellent adhesive and the edges of the blank 2 are chamfered (blunt edges are not chamfered).

Based on the schemes of the above embodiments, the optical disc 3 in this embodiment performs disc forming polishing on two blanks 2 multiple times, so as to sequentially obtain the S3 face, the S2 face, the S1 face, and the S4 face on the optical prism 1.

In the process of processing the S4 surface, the two blanks 2 are arranged in parallel, and the S1 surfaces on the two blanks 2 are arranged oppositely.

It is understood that the S3 faces of the two blanks 2 are next to the third mating disc 6, and the S1 faces of the two blanks 2 are oppositely disposed in a direction of a straight line passing through the center of the optical disc 3.

In this embodiment, the two blanks 2 are arranged in parallel, and the S1 surfaces on the two blanks 2 are arranged opposite to each other, so that when the fourth surface H4 to be processed of the blank 2 is frosted, a V-shaped gap is formed between the S1 surfaces of the two blanks 2, and the operation of the polishing machine is facilitated.

In some embodiments, as shown in fig. 6 and 14, the step of performing surface shape and angle repair on the optical prism 1 after disk polishing of the present embodiment includes: the S1 surface of the optical prism 1 is subjected to surface shape repair.

The step of performing surface shape repair on the S1 surface on the optical prism 1 includes:

in step 611, the optical prism 1 is placed in the limiting hole 91 of the ring polishing spacer 9, so as to ensure that the S1 surface on the optical prism 1 is attached to the polishing table.

Step 612, the optical prism 1 is embedded in the V-shaped groove 111 of the single-pull tool 11, so that the S2 surface on the optical prism 1 is bonded to the first groove wall 1111 of the V-shaped groove 111, and the S3 surface on the optical prism 1 is bonded to the second groove wall 1112 of the V-shaped groove 111.

In step 613, the first pressing block 12 is arranged on the top surface of the single-pull tool 11.

Step 614, the surface shape repair device is started to repair the S1 surface.

It is to be understood that the ring polishing spacer 9 is disc-shaped, the upper surface is provided with a limiting hole 91, the limiting holes 91 are strip-shaped and are provided with two limiting holes 91, the extending directions of the two limiting holes 91 are arranged in parallel, the polishing table is arranged on the lower side of the ring polishing spacer 9, the optical prism 1 is placed in the limiting hole 91, and the S1 surface of the optical prism 1 is attached to the polishing table so as to facilitate surface shape repair of the S1 surface.

When the optical prism 1 is installed, the optical prism 1 is installed in the single-pull tool 11, acetone glue is smeared on the first groove wall 1111 and the second groove wall 1112 of the V-shaped groove 111 of the single-pull tool 11, the S2 surface and the S3 surface of the optical prism 1 are adhered in the V-shaped groove 111 of the single-pull tool 11, the optical prism 1 and the single-pull tool 11 are put into the ring polishing spacer 9 together, the S1 surface of the optical prism 1 passes through the limiting hole 91 to be attached to the polishing table, the first pressing block 12 is pressed on the top surface of the single-pull tool 11, surface shape repairing equipment is started, the S1 surface is repaired to the required surface shape precision, and the position and the weight of the first pressing block 12 can be adjusted according to the surface shape change trend in the surface shape repairing process.

During inspection, the optical prism 1 is placed for 4 hours, the surface shape PV of the S3 and S2 surfaces is less than 0.002mm (N is less than 6.3 fr), and the effective light transmission caliber of the S1 surface is as follows: 290mm×30mm, PV < 200nm (N < 0.63 fr), 50nm (DeltaN < 0.157 fr) in any 30mm×50mm area, S3& S2 verticality 15 ', and included angle 45 DEG+ -3' of S2& S1 surface meet the requirement to judge that the processing is finished, otherwise, the optical prism 1 is continuously reworked.

In some embodiments, as shown in fig. 7 and 15, the step of performing surface shape and angle repair on the optical prism 1 after disk polishing of the present embodiment includes: the angle repair is performed for a 45 ° angle on the optical prism 1.

A step of performing angle repair for a 45 ° angle on the optical prism 1, comprising:

in step 711, the two optical prisms 1 are placed in the same limiting hole 91 of the ring polishing spacer 9, so as to ensure that the S1 surfaces of the two optical prisms 1 are bonded, and the S2 surface of one of the two optical prisms 1 is bonded to the polishing table.

In step 712, the second pressing block 13 is disposed on the S2 surface of the other of the two optical prisms 1.

In step 713, the surface shape repair device is started to perform surface shape repair on the S2 surface to achieve angle repair on the 45 ° angle on the optical prism 1.

It will be appreciated that after the surface shape of the optical prism 1 is repaired to be qualified, if the angle is not qualified, the angle repair is required.

Firstly, the S1 surfaces of the two optical prisms 1 are coated with acetone glue, the S1 surfaces of the two optical prisms 1 are adhered together, the two optical prisms 1 form a combined body, secondly, protective glass is additionally arranged on the outer side of the combined body, the two ends of the optical prisms 1 can be protected from collision, cerium oxide polishing liquid can be prevented from being adhered to parts and difficult to remove, the combined body is placed into a limiting hole 91 of a ring polishing spacer 9, the S2 surface of one of the two optical prisms 1 is adhered to a polishing table, a second pressing block 13 is pressed on the S2 surface of the other one of the two optical prisms 1, finally, surface shape repairing equipment is started to repair the S2 surface to complete repairing of an included angle of 45 degrees between the S1 surface and the S2 surface, the placing position of a second pressing block 13 is judged according to angle measured data, and then the second pressing block 13 is used for applying pressure to complete repairing of a right angle between the S2 surface and the S3 surface, after the S2 surface of one of the two optical prisms 1 meets the requirement, the other repairing of the two optical prisms 1 is turned over for 180 degrees, and the other repairing of the two optical prisms 1 is carried out.

During the inspection, the optical prism 1 is placed for 2 hours, the processing is completed after the angle detection meets the requirement, and otherwise, the angle repair is continued to be repaired.

In some embodiments, as shown in fig. 8, the processing method of the trapezoidal optical prism of the present embodiment further includes: the surface shape of the S1 surface of the optical prism 1 is manually trimmed.

The manual repair step comprises the following steps:

Step 811, obtaining a surface shape map of the S1 surface on the optical prism 1.

Step 812, marking the unqualified surface shape position on the S1 surface according to the surface shape graph.

Step 813, wiping the convex surface shape position.

It is understood that the inspection apparatus is used to obtain a profile of the S1 side of the optical prism 1, and the cotton cloth wet with cerium oxide is used to wipe the unqualified profile position to perform a hand repair on the S1 side of the optical prism 1.

The manual repair is used as a supplement to the surface shape repair and angle repair of the optical prism 1 by using a machine, and can make the surface shape accuracy of the optical prism 1 more perfect.

The optical cement process requires high manufacturing precision of the optical cement surface, and the first distribution plate 4, the second distribution plate 5, the third distribution plate 6, the cuboid part 7, the 45-degree backing plate 8 and the optical cement plate 3 are processed in an optical processing mode before optical cement is carried out on the optical parts, so that good aperture, aperture local error, parallel and vertical indexes of the optical parts are obtained.

In some examples, as shown in fig. 19, the first tray 4 includes a bottom surface P1 and a top surface P2, the material of the first tray 4 is microcrystalline, the dimensions of the finished first tray 4 are 61mm×38mm×10mm, and the processing flow and index of the first tray 4 can be seen in table 1 below.

Table 1: first distribution plate 4 processing flow and index

In some examples, as shown in fig. 20, the bottom surface T1 of the second tray 5, the material of the second tray 5 is microcrystalline, and the dimensions of the finished second tray 5 are 50mm×43mm×34.5mm, and the processing flow and index of the second tray 5 can be seen in table 2 below.

Table 2: second distribution plate 5 processing flow and index

In some examples, as shown in fig. 21, the bottom surface W1 of the third tray 6, the material of the third tray 6 is microcrystalline, the dimensions of the finished third tray 6 are 52mm×33mm×31mm, and the processing flow and index of the third tray 6 can be seen in table 3 below.

Table 3: third distribution plate 6 processing flow and index

In some examples, as shown in fig. 22, the cuboid part 7 includes a top surface O1, a bottom surface O2, a first side surface O3 and a second side surface O4, the material of the cuboid part 7 is K9, the dimensions of the cuboid part 7 are 200mm×40mm×30.05mm, and the processing flow and index of the cuboid part 7 can be seen in table 4 below.

Table 4: cuboid part 7 processing flow and index

In some examples, as shown in fig. 18, the 45 ° shim plate 8 includes a first optical cement surface R1, a second optical cement surface R2, a first right-angle surface R3, and a third optical cement surface R4, the material of the 45 ° shim plate 8 is K9, the angular precision is ±2″ and the dimensions of the 45 ° shim plate 8 are 200mm×33mm×24mm, and the processing flow and the index of the 45 ° shim plate 8 can be seen in table 5 below.

Table 5: 45-degree backing plate 8 processing flow and index

In some examples, as shown in fig. 23, the optical cement disc 3 includes an optical cement surface M1 and a bottom surface M2, the optical cement disc 3 is made of quartz, and the optical cement disc 3 has a diameter ofThe surface shape of the optical disc 3 is 0.1fr (0.05λ@633 nm), and the parallelism θ between the upper and lower surfaces is less than 1', and the processing flow and index of the optical disc 3 can be seen in the following Table 6.

Table 6: processing flow and index of optical cement disc 3

In some examples, as shown in fig. 16, the material of the optical prism 1 is microcrystalline, the optical prism 1 includes an S1 face, an S2 face, an S3 face, and an S4 face, the dimensions of the optical prism 1 are 33mm×24mm×300mm, chamfering is performed using a cnc 1, and the machining allowance for each face is 0.5mm.

In some examples, as shown in fig. 17, the material of the blank 2 is microcrystalline, the blank 2 includes a first surface H1 to be processed, a second surface H2 to be processed, a third surface H3 to be processed, and a fourth surface H4 to be processed, the size of the blank 2 is 34.05mm× 34.05mm×300mm, chamfering is completed by using a engraving and milling machine, the chamfer size is C1, and the machining allowance of each surface is 0.5mm.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; while the invention has been described in detail with reference to the foregoing embodiments, it will be appreciated by those skilled in the art that variations may be made in the techniques described in the foregoing embodiments, or equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of processing a trapezoidal optical prism, comprising:

annealing the blank corresponding to the optical prism;

Wherein, in the process of polishing a plurality of blanks into a disc and polishing the disc each time, a plurality of matched discs are also arranged on the optical cement disc, the matched discs are arranged among the blanks, and the matched discs and the blanks are arranged in a central symmetry way relative to the center of the optical cement disc;

The step of performing surface shape and angle repair on the optical prism after disk polishing comprises the following steps: performing angle repair on the 45-degree angle on the optical prism;

2. The method of claim 1, wherein the mating discs comprise a first mating disc and a second mating disc, and wherein the step of machining the S3 face on the optical prism comprises:

3. The method of claim 2, wherein the first plurality of plates are arranged in series along the length of the rectangular part.

4. The method of claim 1, wherein the mating discs comprise a first mating disc and a second mating disc, and wherein the step of machining the S2 face on the optical prism comprises:

5. The method of claim 1, wherein the mating disk comprises a second mating disk, and wherein the step of machining the S1 surface on the optical prism comprises: the S3 surface light glue processed on the blank is coated on the first light glue surface on the 45-degree backing plate, so as to form a second optical glued piece;

6. The method of claim 1, wherein the tray comprises a third tray, and wherein the step of processing the S4 surface on the optical prism comprises: symmetrically arranging a plurality of blanks on a photoresist disc, and ensuring that the S2 surface photoresist is processed on the blanks on the photoresist surface of the photoresist disc;

7. The method for processing a trapezoidal optical prism according to any one of claims 1 to 6, wherein the two blanks are subjected to disc forming polishing for a plurality of times based on an optical disc, and an S3 face, an S2 face, an S1 face and an S4 face on the optical prism are sequentially obtained;

8. The method of processing a trapezoidal optical prism according to any one of claims 1 to 6, wherein the step of performing surface shape and angle repair on the optical prism after disk polishing comprises: performing surface shape repair on the S1 surface on the optical prism;

arranging a first pressing block on the top surface of the single-pull tool;

9. The method of processing a trapezoidal optical prism according to any one of claims 1 to 6, further comprising: performing manual repair on the S1 surface shape on the optical prism;

And wiping the surface-shaped position.