Prism bonding structure and bonding method

Abstract

The invention discloses a prism bonding structure and bonding method, the prism bonding structure is used for bonding a racemization prism, and the prism bonding structure comprises a prism mounting seat, a prism cover plate and a pressing ring; the prism mounting seat comprises a bottom plate, and two opposite side surfaces of the bottom plate are respectively provided with a first side plate and a second side plate; the second side plate is provided with a tool pressing plate. The other two opposite side faces of the bottom plate are provided with a positioning block and a detachable tool baffle respectively. The first side plate, the tool pressing plate, the positioning block and the tool baffle plate position the prism from four directions; a plurality of bosses are also symmetrically arranged on the bottom plate, a plurality of threaded holes are also symmetrically formed in the prism cover plate, and threads corresponding to the threaded holes are formed in the pressing ring; the prism cover plate covers the prism mounting base, the pressing ring is rotated to enable an interval with the thickness of an adhesive layer to exist between the pressing ring and the prism, the adhesive layers are arranged on all the bosses and the plane of the pressing ring, and the prism is bonded through the arranged adhesive layers. The structure and the bonding process are simple, and the installation and adjustment efficiency and the position precision of the prism in the vibration environment are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of optical machine design and assembly, and particularly relates to a prism bonding structure and a bonding method. Background Art

[0002] Prisms are polyhedrons made of transparent materials and are widely used in optical systems. For example, a large number of derotation optical systems use Delta prisms. Prisms are different from common lenses and are not easy to clamp. The surface accuracy of prisms is higher than that of lenses, so the control of surface shape changes caused by installation stress is more demanding than that of lenses.

[0003] The common prism installation structure is a single pressure plate pre-tightening installation structure, that is, a rubber pad is placed between the pressure plate and the prism, and the elasticity of the rubber pad is used to preload the prism. Due to the large preload force, a large installation stress will be generated, causing the prism to deform and causing stress refraction. The bonding structure is simple and compact, with uniform stress distribution and good temperature adaptability. It can combine parts of different materials together and is widely used in optical instruments. Conventional prism bonding structures generally use silicone rubber for bonding. Since silicone rubber is relatively soft, the prism is easy to move under a vibration environment, so some mechanical positioning surfaces are used to assist the mechanical limit of the prism. Therefore, the installation and adjustment process is more complicated, and the prism position accuracy under vibration is not high enough. Summary of the invention

[0004] The purpose of the present invention is to provide a prism bonding structure and bonding method, which uses epoxy resin glue to reliably bond the prism to the prism mounting seat without the need for mechanical limiters. The prism is not prone to movement in a vibration environment. The structure and bonding process are simple, which greatly improves the installation efficiency and the position accuracy of the prism in a vibration environment.

[0005] In order to achieve the above object, the technical solution provided by the present invention is as follows: According to a first aspect of the present invention, a prism bonding structure is provided for bonding a de-racembrane prism, the prism bonding structure comprising a prism mounting seat, a prism cover plate and a pressure ring; wherein: The prism mounting seat comprises a bottom plate, two opposite sides of the bottom plate are respectively provided with a first side plate and a second side plate, the outer sides of the first side plate and the second side plate are both provided with a trimming boss, and the trimming boss is perpendicular to the inner side of the first side plate; the other two opposite sides of the bottom plate are respectively provided with a positioning block and a detachable tooling baffle, the positioning block is used to locate the axial position of the prism, and the axial direction refers to the plane normal direction of the trimming boss; The second side plate is provided with a through groove, and a tooling pressure plate is provided in the through groove; after the prism is placed on the prism mounting seat, the tooling baffle plate and the tooling pressure plate are used to press the prism so that the prism is pressed to the inner side surface of the first side plate and the positioning block; wherein the inner side surface of the first side plate corresponds to the reflection surface of the prism; the first side plate, the tooling pressure plate, the positioning block and the tooling baffle plate position the prism from four directions; The bottom plate is also symmetrically provided with a plurality of bosses, and the plurality of bosses are coplanar; the prism cover is also symmetrically provided with a plurality of threaded holes, and the pressure ring is provided with threads corresponding to the threaded holes, and can be rotated in the corresponding threaded holes to adjust the distance of the pressure ring relative to the prism; after the prism is placed on the prism mounting seat, the prism cover covers the prism on the prism mounting seat, and the pressure ring is rotated so that a gap of the thickness of the glue layer exists between the pressure ring and the prism, and a glue layer is provided on all the bosses and the plane of the pressure ring, and the prism is bonded by the provided glue layer.

[0006] Furthermore, photographic black paper is adhered to the inner side of the first side plate; a top block is also provided below the bottom plate, and the top block is located at the intersection of the two side surfaces of the bottom plate where the first side plate and the tooling baffle are provided.

[0007] Furthermore, by trimming the plane of the trimming boss, the plane formed by the two trimming bosses forms a certain angle with the original plane, thereby playing a role in adjusting the tilt angle of the prism.

[0008] Furthermore, the top planes of the first side plate and the second side plate of the prism mounting seat are higher than the top surface of the prism by twice the thickness of the adhesive layer.

[0009] Furthermore, the thickness of the glue layer is 0.1 mm, that is, the thickness of the glue spot formed after the glue is squeezed.

[0010] Furthermore, a threaded hole is provided on the side of the bottom plate for mounting the tooling baffle, and the tooling baffle is detachably connected to the bottom plate by screws; a threaded hole is provided on the second side plate, and a through hole is provided at the corresponding position of the tooling pressure plate, and the distance of the tooling pressure plate relative to the prism is adjusted by screws to achieve the tightening of the tooling pressure plate on the prism.

[0011] Furthermore, there are three bosses and three pressing rings; the prism cover plate is covered on the prism mounting seat through the first side plate and the second side plate of the prism mounting seat; and the trimmed boss is provided with a pin hole required for the threaded cylindrical pin.

[0012] According to a second aspect of the present invention, a prism bonding method is provided, which is implemented using any one of the prism bonding structures described above, and the method comprises: According to the area and shape of the inner side surface of the first side plate in contact with the prism, cut a piece of photographic black paper and stick it to the inner side surface of the first side plate; Put glue on the center of the plane of the boss, cut a hard wire with a diameter equal to the thickness of the glue layer and place it on the boss; Put the prism vertically into the prism mounting seat from top to bottom, and make the prism lean against the inner side of the first side plate and the positioning block; under the weight of the prism, the glue is pressed into a glue spot, and the thickness of the glue spot is consistent with the diameter of the hard silk thread; Using a tooling baffle and a tooling pressure plate to press the prism tightly to the inner side surface of the first side plate and the positioning block; Place photographic black paper with a thickness of glue layer on the top surface of prism, cover the prism cover and rotate the pressing ring until the pressing ring contacts the photographic black paper; open the prism cover and take away the photographic black paper, apply glue on the flat surface of the pressing ring, and then cover the prism cover again; Installing a top block on the bottom plate of the prism mounting seat so that a certain inclination angle is formed between the prism mounting seat and the horizontal plane, so that the prism is pressed tightly to the inner side surface of the first side plate and the positioning block under its own weight; Remove the tooling baffle and tooling pressure plate, place it horizontally, and allow the glue to solidify gradually. After solidification, remove the top block to complete the prism bonding.

[0013] Furthermore, the thickness of the glue layer is 0.1 mm, that is, the thickness of the glue spot; the top block is located at the intersection of the two side surfaces of the first side plate and the tooling baffle set on the bottom plate.

[0014] Furthermore, the glue is epoxy resin glue, and the amount of glue is calculated by the glue spot area and glue layer thickness required for the bonding strength.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention provides a prism bonding structure and bonding method, which uses epoxy resin glue to reliably bond the prism to the prism mounting seat, and then cooperates with the multi-directional clamping structure of the prism mounting seat, including a first side plate, a tooling pressure plate, a positioning block and a tooling baffle for positioning from four directions, and the synergistic effect of a pressure ring and a boss, which significantly improves the bonding reliability and effectively prevents the prism from moving in a vibration environment. At the same time, the prism inclination angle is accurately controlled by trimming the boss to adjust the installation plane angle, the positioning block accurately positions the prism axial position, and the inner side of the first side plate is glued with photographic black paper to prevent collision. These designs enable the prism to reach a more accurate position and angle during the bonding process, ensure the accuracy of the optical path, reduce prism deformation, greatly improve the performance of the optical system, simplify the installation and adjustment process, and improve the installation and adjustment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a structural schematic diagram of a prism bonding structure of an example of the present invention from a first viewing angle; Figure 2 is a structural schematic diagram of a prism bonding structure of an example of the present invention from a second viewing angle; Figure 3 is a schematic structural diagram of a prism mounting seat according to an example of the present invention; Figure 4is a schematic diagram of a prism according to an example of the present invention.

[0017] In the figure: 1-prism mounting seat, 2-prism, 3-prism cover, 4-pressing ring, 5-tooling pressing plate, 6-photographic black paper, 7-tooling baffle, 8-top block, 9-screw, 11-cutting boss, 12-positioning block, 13-A plane, 14-boss, 41-pressing ring plane. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] The present invention provides a prism bonding structure, such as Figure 1 and Figure 2 As shown, it mainly includes structural parts such as a prism mounting seat 1, a prism cover plate 3, a pressure ring 4, a tooling baffle 7, a tooling pressure plate 5 and a prism 2.

[0020] like Figure 3 As shown, the prism mount 1 includes a bottom plate and a first side plate and a second side plate arranged opposite to each other on the bottom plate, and the bottom plate, the first side plate and the second side plate together constitute the prism mount 1. The outer sides of the first side plate and the second side plate are provided with trimming bosses 5 for facilitating trimming. Trimming refers to the use of grinding to reduce the material in a local area of ​​the mounting plane, and the grinding mounting plane forms a certain angle with the original plane, thereby playing a role in adjusting the inclination angle of the prism. Exemplarily, after trimming the trimming bosses of the first side plate and the second side plate, the prism mount 1 will have a rotation angle compared with before. The trimming boss 11 is provided with the pin hole required for the GB 878 threaded cylindrical pin, so as to facilitate fixing the prism mount 1.

[0021] The prism mount 1 is equipped with a positioning block 12 to facilitate positioning of the prism axial position, where the axial direction refers to the normal direction of the plane on the trimmed boss. The angle between the positioning block 12 and the inner side surface of the first side panel should match the prism. After installing the prism 2, the top plane of the prism mount 1 should be 0.2 mm higher than the top surface of the prism 2 (equivalent to twice the thickness of the adhesive layer). The bottom of the prism mount 1 is equipped with three bosses 14, and these three bosses 14 are coplanar; the A plane 13 shown in the prism mount 1 (i.e., the inner side surface of the first side panel) and the plane of the trimmed boss 11 have a verticality tolerance requirement, which can position the prism. Among them, the A plane 13 is in contact with the reflective surface of the prism 2. As Figure 4 As shown, the light is incident from the incident surface, reflected by the reflecting surface, and then emitted from the exiting surface.

[0022] The prism bonding structure also has tooling such as a tooling baffle plate 7, a tooling pressure plate 5, and a top block 8, which are convenient for preventing the prism 2 from slipping after bonding. The second side plate is provided with a through groove and a threaded hole, the tooling pressure plate 5 is located in the through groove and a through hole is provided at the corresponding position, and the screw is inserted into the threaded hole of the second side plate through the through hole, and the tooling pressure plate 5 is used to adjust the distance of the tooling pressure plate 5 relative to the prism 2 through the screw. The side of the prism mounting seat 1 for mounting the tooling baffle plate 7 is provided with a threaded hole, and the tooling baffle plate 7 is detachably connected to the bottom plate by screws. After the prism 2 is placed on the prism mounting seat 1, the tooling baffle plate 7 and the tooling pressure plate 5 are used to press the prism 2 so that the prism 2 is pressed against the inner side surface (A plane 13) of the first side plate and the positioning block 12.

[0023] The first side plate and the second side plate of the prism mounting seat 1 are provided with threaded holes, and the prism cover plate 3 is covered on the prism mounting seat 1 by screws 9. The pressing ring 4 can rotate in the threaded hole corresponding to the prism cover plate 3, so as to adjust the distance of the pressing ring 4 relative to the prism 2; one end of the pressing ring 4 is a slotted groove, which is convenient for rotating with a slotted wrench, and the other end is a plane, and the pressing ring plane 41 is used for applying glue to bond the prism 2. Photographic black paper 6 is glued on the prism mounting reference plane (A plane 13) on the side of the prism mounting seat 1 to prevent the prism from colliding with metal parts. The tooling pressing plate 5 and the tooling baffle 7 are close to the positioning surface of the prism mounting seat 1 during bonding.

[0024] The present invention also provides a method for bonding a deracembrane prism using the above-mentioned prism bonding structure, comprising the following steps: Step 1: According to the area and shape of the prism mounting reference plane (A plane 13) on the side of the prism mounting base, use scissors to cut a piece of photographic black paper, and then use a small amount of Nanda black 703 glue to stick it to the side prism mounting reference plane (A plane 13).

[0025] Step 2: Use a glue dispenser to apply epoxy resin to the center of the plane of the three bosses on the bottom of the prism mount to form a small glue spot. The amount of glue is calculated based on the glue spot area and thickness required for bonding strength.

[0026] Take out a hard thin wire with a diameter of 0.1mm (such as fishing line), cut several pieces of fishing line with a length of about 2-3mm with scissors, and place them on each glue spot with tweezers, placing one piece of fishing line on each glue spot.

[0027] Place the prism vertically from top to bottom into the prism mount, and after placing it, place the prism against the photographic black paper and positioning block on plane A. Pay attention to alignment when placing it, and the prism should not move more than 1mm when it is close to the positioning surface. Under the weight of the prism, the glue spot is pressed into a larger circular glue spot, and the thickness of the glue spot is consistent with the diameter of the fishing line placed on the glue spot.

[0028] Use the tooling pressure plate and tooling baffle to push the prism up so that the prism is close to the side prism installation reference plane (A plane 13) and the positioning block of the prism mounting seat.

[0029] Step 3: Place photographic black paper on the top surface of the prism, then tighten the prism cover, apply thread glue to the pressing ring, rotate the pressing ring until it touches the photographic black paper, then remove the cover, take away the photographic black paper, apply the same amount of glue to the flat surface of the pressing ring as to the flat surface of the bottom surface, place the prism cover vertically, and tighten the screws with thread glue.

[0030] Step 4: Install the top block so that a certain inclination angle is formed between the prism mounting seat and the horizontal plane. The prism is close to the side prism mounting reference plane (A plane 13) and the positioning block under its own weight.

[0031] Step 5: Place the bottom surface of the prism horizontally in a drying cabinet, then remove the tooling baffle and tooling pressure plate to solidify. After solidification, remove the top block to complete the bonding.

[0032] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0033] It will be easily understood by those skilled in the art that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prism bonding structure, characterized in that: Used for bonding de-racembrane prisms, the prism bonding structure comprises a prism mounting seat, a prism cover plate and a pressing ring; wherein: The prism mounting seat comprises a bottom plate, two opposite sides of the bottom plate are respectively provided with a first side plate and a second side plate, the outer sides of the first side plate and the second side plate are both provided with a trimming boss, and the trimming boss is perpendicular to the inner side of the first side plate; the other two opposite sides of the bottom plate are respectively provided with a positioning block and a detachable tooling baffle, the positioning block is used to locate the axial position of the prism, and the axial direction refers to the plane normal direction of the trimming boss; The second side plate is provided with a through groove, and a tooling pressure plate is provided in the through groove; after the prism is placed on the prism mounting seat, the tooling baffle plate and the tooling pressure plate are used to press the prism so that the prism is pressed to the inner side surface of the first side plate and the positioning block; wherein the inner side surface of the first side plate corresponds to the reflection surface of the prism; the first side plate, the tooling pressure plate, the positioning block and the tooling baffle plate position the prism from four directions; The bottom plate is also symmetrically provided with a plurality of bosses, and the plurality of bosses are coplanar; the prism cover is also symmetrically provided with a plurality of threaded holes, and the pressure ring is provided with threads corresponding to the threaded holes, and can be rotated in the corresponding threaded holes to adjust the distance of the pressure ring relative to the prism; after the prism is placed on the prism mounting seat, the prism cover covers the prism on the prism mounting seat, and the pressure ring is rotated so that a gap of the thickness of the glue layer exists between the pressure ring and the prism, and a glue layer is provided on all the bosses and the plane of the pressure ring, and the prism is bonded by the provided glue layer.

2. The prism bonding structure according to claim 1, characterized in that: The inner side surface of the first side plate is adhered with photographic black paper; a top block is also arranged below the bottom plate, and the top block is located at the intersection of the bottom plate where the first side plate and the two side surfaces of the tooling baffle are arranged.

3. The prism bonding structure according to claim 1, characterized in that: By trimming the plane of the trimming boss, the plane formed by the two trimming bosses forms a certain angle with the original plane, thereby playing a role in adjusting the tilt angle of the prism.

4. The prism bonding structure according to claim 1, characterized in that: The top planes of the first side plate and the second side plate of the prism mounting seat are higher than the top surface of the prism by two times of the thickness of the adhesive layer.

5. The prism bonding structure according to claim 1 or 4, characterized in that: The thickness of the glue layer is 0.1mm, which is the thickness of the glue spot formed after the glue is squeezed.

6. The prism bonding structure according to claim 1, characterized in that: A threaded hole is provided on the side of the tooling baffle for mounting on the bottom plate, and the tooling baffle is detachably connected to the bottom plate by screws; a threaded hole is provided on the second side plate, and a through hole is provided at the corresponding position of the tooling pressure plate, and the distance of the tooling pressure plate relative to the prism is adjusted by the screws to achieve the tightening of the tooling pressure plate on the prism.

7. The prism bonding structure according to claim 1, characterized in that: There are three bosses and three pressing rings; the prism cover plate is covered on the prism mounting seat through the first side plate and the second side plate of the prism mounting seat; and the trimming boss is provided with a pin hole required for a threaded cylindrical pin.

8. A prism bonding method, characterized in that: The method is implemented by using the prism bonding structure according to any one of claims 1 to 7, comprising: According to the area and shape of the inner side surface of the first side plate in contact with the prism, cut a piece of photographic black paper and stick it to the inner side surface of the first side plate; Put glue on the center of the plane of the boss, cut a hard wire with a diameter equal to the thickness of the glue layer and place it on the boss; Put the prism vertically into the prism mounting seat from top to bottom, and make the prism lean against the inner side of the first side plate and the positioning block; under the weight of the prism, the glue is pressed into a glue spot, and the thickness of the glue spot is consistent with the diameter of the hard silk thread; Using a tooling baffle and a tooling pressure plate to press the prism tightly to the inner side surface of the first side plate and the positioning block; Place photographic black paper with a thickness of glue layer on the top surface of prism, cover the prism cover and rotate the pressing ring until the pressing ring contacts the photographic black paper; open the prism cover and take away the photographic black paper, apply glue on the flat surface of the pressing ring, and then cover the prism cover again; Installing a top block on the bottom plate of the prism mounting seat so that a certain inclination angle is formed between the prism mounting seat and the horizontal plane, so that the prism is pressed tightly to the inner side surface of the first side plate and the positioning block under its own weight; Remove the tooling baffle and tooling pressure plate, place it horizontally, and allow the glue to solidify gradually. After solidification, remove the top block to complete the prism bonding.

9. The prism bonding method according to claim 8, characterized in that: The thickness of the glue layer is 0.1 mm, that is, the thickness of the glue spot; the top block is located at the intersection of the two side surfaces of the first side plate and the tooling baffle set on the bottom plate.

10. The prism bonding method according to claim 8, characterized in that: The glue is epoxy resin glue, and the amount of glue is calculated based on the glue spot area and glue layer thickness required for bonding strength.

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