A prism bonding structure and bonding method

Abstract

The present invention discloses a prism bonding structure and bonding method. The prism bonding structure is used for bonding a derotational prism and includes a prism mounting seat, a prism cover plate, and a pressure ring. The prism mounting seat includes a base plate, two opposite sides of the base plate are respectively provided with a first side plate and a second side plate; the second side plate is provided with a tooling pressure plate; the other two opposite sides of the base plate are respectively provided with a positioning block and a detachable tooling baffle; the first side plate, the tooling pressure plate, the positioning block, and the tooling baffle position the prism from four directions; the base plate is also symmetrically provided with a plurality of bosses, the prism cover plate is also symmetrically provided with a plurality of threaded holes, and the pressure ring is provided with threads corresponding to the threaded holes; the prism cover plate is fitted onto the prism mounting seat, the pressure ring is rotated to form a gap of a thickness of a glue layer between the pressure ring and the prism, and a glue layer is provided on all bosses and the pressure ring surface, and the prism is bonded via the provided glue layer. The present invention has a simple structure and bonding process, and improves the assembly efficiency and the position accuracy of the prism in a vibration environment.

Description

Technical Field

[0001] The present 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 utilize delta prisms. Unlike common lenses, prisms are not easily clamped. Furthermore, prisms require higher surface precision than lenses, making control of surface shape changes caused by mounting stress more demanding than with lenses.

[0003] The most common prism mounting structure is a single pressure plate pre-tightening mounting 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 resulting in stress refraction. The adhesive structure is simple and compact, with uniform stress distribution and good temperature adaptability. It can combine parts of different materials 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 vibration conditions, so some mechanical positioning surfaces are used to assist the mechanical limiting of the prism. Therefore, the assembly and adjustment process is relatively 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 vibrating environment. The structure and bonding process are simple, greatly improving the installation efficiency and the position accuracy of the prism in a vibrating environment.

[0005] In order to achieve the above-mentioned purpose, the technical solutions provided by the present invention are as follows:

[0006] According to a first aspect of the present invention, a prism bonding structure is provided for bonding a derotational prism. The prism bonding structure comprises a prism mounting seat, a prism cover plate, and a pressure ring; wherein:

[0007] The prism mounting seat includes a base plate, two opposite side surfaces of the base 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 respectively provided with a trimming boss, and the trimming boss is perpendicular to the inner side surface of the first side plate; the other two opposite side surfaces of the base 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;

[0008] The second side plate is provided with a through slot, in which a tooling pressure plate is provided; after the prism is placed on the prism mounting seat, the tooling baffle and the tooling pressure plate are used to press the prism so that the prism is pressed against 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 reflective surface of the prism; the first side plate, the tooling pressure plate, the positioning block and the tooling baffle position the prism from four directions;

[0009] 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 there is a gap of the thickness of the glue layer between the pressure ring and the prism, and a glue layer is provided on all the bosses and the pressure ring plane, and the prism is bonded by the provided glue layer.

[0010] Furthermore, photographic black paper is adhered to the inner side of the first side panel; a top block is also provided below the bottom panel, and the top block is located at the intersection of the two side surfaces of the bottom panel where the first side panel and the tooling baffle are provided.

[0011] Furthermore, by trimming the plane of the trimming bosses, 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.

[0012] 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.

[0013] 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.

[0014] Furthermore, a threaded hole is provided on the side of the base plate for mounting the tooling baffle, and the tooling baffle is detachably connected to the base 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 between the tooling pressure plate and the prism is adjusted by the screws to achieve the tightening of the tooling pressure plate on the prism.

[0015] 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.

[0016] 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, the method comprising:

[0017] Cut a piece of photographic black paper according to the area and shape of the inner side surface of the first side plate in contact with the prism, and stick it to the inner side surface of the first side plate;

[0018] Apply glue to the center of the flat surface of the boss, and cut a hard wire with a diameter equal to the thickness of the glue layer and place it on the boss;

[0019] Place the prism vertically into the prism mount from top to bottom, and place the prism 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;

[0020] Use the tooling baffle and the tooling pressure plate to press the prism tightly to the inner side surface of the first side plate and the positioning block;

[0021] Place photographic black paper of the same thickness as the adhesive layer on the top surface of the prism, close the prism cover and rotate the pressure ring until the pressure ring contacts the photographic black paper; open the prism cover and remove the photographic black paper, apply glue on the flat surface of the pressure ring, and then close the prism cover again;

[0022] Installing a top block on the bottom plate of the prism mounting seat so that the prism mounting seat forms a certain inclination angle with the horizontal plane, so that the prism is pressed tightly against the inner side surface of the first side plate and the positioning block under its own weight;

[0023] 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.

[0024] 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 bottom plate where the first side plate and the tooling baffle are arranged.

[0025] Furthermore, 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.

[0026] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0027] The present invention provides a prism bonding structure and bonding method. Epoxy resin glue is used to reliably bond the prism to the prism mounting seat. Combined with the prism mounting seat's multi-directional clamping structure, including a first side panel, 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, this significantly improves bonding reliability and effectively prevents the prism from moving in a vibrating environment. Furthermore, the prism's tilt angle is precisely controlled by trimming the boss to adjust the mounting plane angle. The positioning block accurately positions the prism's axial position, and photographic black paper is adhered to the inner side of the first side panel to prevent impact. These designs enable the prism to achieve a more precise position and angle during the bonding process, ensuring an accurate optical path and reducing prism deformation. This significantly enhances optical system performance, simplifies the assembly and adjustment process, and improves assembly and adjustment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 2 is a schematic structural diagram of a prism bonding structure according to an embodiment of the present invention from a first viewing angle;

[0029] Figure 2 2 is a schematic structural diagram of a prism bonding structure according to an embodiment of the present invention from a second viewing angle;

[0030] Figure 3 is a schematic structural diagram of a prism mounting base according to an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of a prism according to an example of the present invention.

[0032] In the figure: 1-prism mounting seat, 2-prism, 3-prism cover, 4-pressing ring, 5-tooling pressure 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

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate 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 may be combined with each other as long as they do not conflict with each other.

[0034] 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.

[0035] like Figure 3 As shown, the prism mount 1 includes a base plate and a first side plate and a second side plate disposed opposite each other on the base plate. The base plate, the first side plate, and the second side plate together constitute the prism mount 1. The outer sides of the first and second side plates are each provided with a trimming boss 5 to facilitate trimming. Trimming refers to the use of grinding to reduce the material in a local area of ​​the mounting surface. The ground mounting surface forms a certain angle with the original surface, thereby adjusting the tilt angle of the prism. For example, after trimming the trimming bosses of the first and second side plates, the prism mount 1 will have a rotation angle compared to before. The trimming boss 11 is provided with the pin hole required for the GB 878 threaded cylindrical pin to facilitate the fixing of the prism mount 1.

[0036] The prism mount 1 is provided with a positioning block 12, which is convenient for positioning the axial position of the prism. 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 0.2mm 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 provided 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 be used to position the prism. Among them, the A plane 13 is in contact with the reflective surface of the prism 2. As shown in FIG. Figure 4 As shown, the light is incident from the incident surface, reflected by the reflecting surface, and then emitted from the exit surface.

[0037] The prism bonding structure also features a tooling baffle 7, a tooling pressure plate 5, and a top block 8, which facilitate anti-slip bonding of the prism 2. The second side panel is provided with a through-slot and threaded holes. The tooling pressure plate 5 is positioned within the through-slot and has corresponding perforations. Screws pass through the perforations and are inserted into the threaded holes of the second side panel. The tooling pressure plate 5 is used to adjust the distance of the tooling pressure plate 5 relative to the prism 2. The side of the prism mount 1 where the tooling baffle 7 is mounted is provided with threaded holes. The tooling baffle 7 is detachably connected to the base plate via screws. After the prism 2 is placed in the prism mount 1, the tooling baffle 7 and the tooling pressure plate 5 are used to press the prism 2 against the inner side surface (plane A 13) of the first side panel and the positioning block 12.

[0038] The first and second side panels of the prism mount 1 are provided with threaded holes, and the prism cover 3 is secured to the prism mount 1 with screws 9. A pressure ring 4 can be rotated within the corresponding threaded holes in the prism cover 3, allowing adjustment of the distance between the pressure ring 4 and the prism 2. One end of the pressure ring 4 has a slot for easy rotation with a flat-blade wrench, while the other end has a flat surface 41 for applying glue to the prism 2. A photographic black paper 6 is attached to the prism mounting reference plane (plane A 13) on the side of the prism mount 1 to prevent the prism from colliding with metal parts. The tooling pressure plate 5 and tooling baffle 7 rest against the locating surface of the prism mount 1 during bonding.

[0039] The present invention also provides a method for bonding a deracemated prism using the above-mentioned prism bonding structure, comprising the following steps:

[0040] Step 1: Cut a piece of photographic black paper according to the area and shape of the prism mounting reference plane (Plane A 13) on the side of the prism mount with scissors, and then use a small amount of Nanda black 703 adhesive to stick it to the prism mounting reference plane (Plane A 13) on the side of the prism mount.

[0041] Step 2: Use a dispenser to apply epoxy resin to the center of the three flat surfaces of the prism mount's bottom surface, creating a small adhesive spot. The amount of adhesive required is calculated based on the area and thickness of the adhesive spot for optimal bonding strength.

[0042] Take out a hard thin wire with a diameter of 0.1mm (such as fishing line), cut several pieces of fishing line about 2-3mm in length with scissors, and place them on each glue spot with tweezers, placing one piece of fishing line on each glue spot.

[0043] Place the prism vertically into the prism mount from top to bottom. Once positioned, place the prism against the photographic black paper and positioning blocks on plane A. Pay careful attention to alignment during placement; the prism should not move more than 1mm when pressed against the positioning surfaces. Under the weight of the prism, the adhesive patch will be compressed into a larger circular patch, the thickness of which matches the diameter of the fishing line placed on it.

[0044] Use the fixture pressure plate and fixture baffle to push the prism up so that the prism is close to the side prism installation reference plane (A plane 13) and positioning block of the prism mount.

[0045] Step 3: Place photographic black paper on the top surface of the prism, then tighten the prism cover, apply thread glue to the pressure ring threads, rotate the pressure ring until it contacts the photographic black paper, then remove the cover, remove the photographic black paper, apply the same amount of glue to the pressure ring flat surface as to the glue surface on the bottom surface, place the prism cover vertically, and tighten the screws with thread glue.

[0046] Step 4: Install the top block so that the prism mount forms a certain inclination angle with the horizontal plane. The prism, under its own weight, is close to the side prism installation reference plane (A plane 13) and the positioning block.

[0047] Step 5: Place the prism bottom surface horizontally in a drying cabinet, then remove the tooling baffle and tooling pressure plate to cure. After curing, remove the top block to complete the bonding.

[0048] 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, or 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.

[0049] It will be easily understood by those skilled in the art that the above are merely 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 scope of protection of the present invention.

Claims

1. A prism bonding structure, characterized in that: Used for bonding derotation prisms, the prism bonding structure includes a prism mounting seat, a prism cover plate and a pressure ring; wherein: The prism mounting seat includes a base plate, two opposite side surfaces of the base 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 respectively provided with a trimming boss, and the trimming boss is perpendicular to the inner side surface of the first side plate; the other two opposite side surfaces of the base 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 slot, in which a tooling pressure plate is provided; after the prism is placed on the prism mounting seat, the tooling baffle and the tooling pressure plate are used to press the prism so that the prism is pressed against 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 reflective surface of the prism; the first side plate, the tooling pressure plate, the positioning block and the tooling baffle 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 there is a gap of the thickness of the glue layer between the pressure ring and the prism, and a glue layer is provided on all the bosses and the pressure ring plane, and the prism is bonded by the provided glue layer.

2. The prism bonding structure according to claim 1, wherein: The inner side of the first side plate is adhered with photographic black paper; a top block is further 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.

3. The prism bonding structure according to claim 1, wherein: 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, wherein: 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.

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, wherein: A threaded hole is provided on the side of the tooling baffle for mounting 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. The distance between the tooling pressure plate and 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, wherein: 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 using the prism bonding structure according to any one of claims 1 to 7, comprising: Cut a piece of photographic black paper according to the area and shape of the inner side surface of the first side plate in contact with the prism, and stick it to the inner side surface of the first side plate; Apply glue to the center of the flat surface of the boss, and cut a hard wire with a diameter equal to the thickness of the glue layer and place it on the boss; Place the prism vertically into the prism mount from top to bottom, and place the prism 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; Use the tooling baffle and the tooling pressure plate to press the prism tightly to the inner side surface of the first side plate and the positioning block; Place a piece of photographic black paper of the same thickness as the adhesive layer on the top surface of the prism, close the prism cover and rotate the pressure ring until it contacts the photographic black paper; open the prism cover and remove the photographic black paper, apply glue to the flat surface of the pressure ring, and then close the prism cover again; Installing a top block on the bottom plate of the prism mounting seat so that the prism mounting seat forms a certain inclination angle with the horizontal plane, so that the prism is pressed tightly against 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, wherein: 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 first side plate and the two side surfaces of the tooling baffle set on the bottom plate.

10. The prism bonding method according to claim 8, wherein: 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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