Cubic beam splitter prism assembling device

Abstract

The utility model discloses an assembling device of a cubic beam splitter prism, which comprises a light source, an autocollimator, two cube-corner prisms and two supports, the autocollimator is arranged in the emergent direction of the light source, at least one support comprises a displacement adjusting module, a lens tool is arranged on the support, and the two cube-corner prisms are arranged on the lens tool. The lens tools are provided with connecting grooves used for being detachably connected with isosceles right-angle prisms, the two lens tools are oppositely arranged to be used for assembling the isosceles right-angle prisms into a cubic beam splitter prism, and the two isosceles right-angle prisms are installed between an autocollimator and a light source. The two cube-corner prisms are oppositely arranged on the two sides of the isosceles right-angle prism, and the connecting line direction of the two cube-corner prisms is perpendicular to the emergent direction of the light source; the device has the advantages of being high in assembly precision, good in product performance and convenient to operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of prism production, and particularly relates to an assembly device for a cube beam splitting prism. Background Art

[0002] A six-axis adjustment mount is a precision adjustment device with six degrees of freedom (translation along the X, Y, and Z axes and three rotational axes). Its design typically includes high-precision guide rails and screw systems, enabling adjustment accuracy at the micron level. By manipulating these degrees of freedom, users can perform full-range fine adjustment and alignment of the object to be adjusted.

[0003] A beam splitter is an optical component used to split incident light into two different beams at a specified ratio. Additionally, a beam splitter can be used to combine two different beams into a single beam. In common laser optical systems, illumination optical systems, and spectrometer optical systems, beam splitters are common optical elements, and users can split incident light according to the intensity transmission and reflection percentages, as well as the polarization states of the transmitted and reflected light, based on specific application requirements. According to the structure, beam splitters can generally be classified into cube beam splitting prisms and plate beam splitters.

[0004] An isosceles right triangular prism is a basic type of prism. Its characteristic is that it can reflect light at the right angle or the inclined surface to achieve the turning of the light beam. Isosceles right triangular prisms can be used for beam alignment, image inversion, flipping, and rotation, and are widely used in optical systems. Generally speaking, cube beam splitting prisms focus more on light separation and beam splitting, while isosceles right triangular prisms are mainly used for light turning and reflection, and both have their unique application values in optical instruments and equipment.

[0005] A cube beam splitting prism is composed of two isosceles right triangular prisms combined. The hypotenuse surface of one prism is coated with a beam splitting film, and the two prisms are optically cemented or glued together to form a cube. A plate beam splitter is composed of a thin and flat glass plate, and a beam splitting film is coated on the outer surface of its substrate. Most plate beam splitters have an anti-reflection film coated on the other surface to reduce unnecessary Fresnel reflection. The advantages of cube beam splitting prisms compared to plate beam splitters are: 1. No beam displacement; 2. Equal transmission and reflection optical paths; 3. The film layer is not exposed to the air, making it not easily damaged and corroded.

[0006] The problem with the prior art is that there are two types of cube beam splitting prisms, namely glued and optically cemented. Compared with glued beam splitting prisms, optically cemented beam splitting prisms have higher transmittance and damage thresholds. However, during optical cementing, the two inclined surfaces will quickly adsorb to each other, and it is difficult to guarantee the assembly accuracy. If there is relative rotation between the two inclined surfaces after adsorption, it is difficult to adjust, which results in an angular deviation between the transmitted beam and the incident beam of the optically cemented cube beam splitting prism, affecting the performance and use, and leading to a high rework rate. Summary of the Invention

[0007] The object of the utility model is to provide an assembly device for a cube beam splitting prism aiming at the problems existing in the prior art, which has the advantages of high assembly accuracy, good product performance and convenient operation.

[0008] To achieve the above object, the technical solution adopted by the utility model is: an assembly device for a cube beam splitting prism, comprising a light source, an autocollimator, two corner cube prisms and two supports. The autocollimator is located in the light emitting direction of the light source. At least one of the supports includes a displacement adjustment module. A lens tooling is arranged on the support. A connecting groove for detachably connecting an isosceles right-angled triangular prism is formed on the lens tooling. The two lens toolings are arranged oppositely to assemble the isosceles right-angled triangular prisms into a cube beam splitting prism. The two isosceles right-angled triangular prisms are installed between the autocollimator and the light source. The two corner cube prisms are arranged oppositely on both sides of the isosceles right-angled triangular prism. The connecting line direction of the two corner cube prisms is perpendicular to the light emitting direction of the light source.

[0009] In the above solution, the isosceles right-angled triangular prisms are divided into a front triangular prism and a rear triangular prism according to the front and rear positions. The collimated light emitted by the light source is vertically incident from the right-angle surface of the front triangular prism. After being reflected by the inclined surface, it reaches a corner cube prism on one side. The corner cube prism will reflect the light parallelly. After being reflected by the two corner cube prisms, the light is vertically incident from the right-angle surface of the rear triangular prism. After being reflected by the inclined surface of the rear triangular prism, it reaches the autocollimator. The position of the lens tooling is adjusted through the displacement adjustment module, and then the relative position of the two isosceles right-angled triangular prisms is adjusted. The connecting groove is used for positioning the isosceles right-angled triangular prism. When the position of the light spot coincides with the zero position, the two isosceles right-angled triangular prisms are relatively parallel. At this time, the inclined surfaces of the two isosceles right-angled triangular prisms can be adhered together to achieve optical cementing. The two lens toolings are arranged oppositely to facilitate the inclined surfaces of the isosceles right-angled triangular prisms to approach and adhere to each other. The two corner cube prisms are arranged oppositely, and the connecting line direction is perpendicular to the light emitting direction of the light source, so as to realize that the light is vertically incident on the rear triangular prism.

[0010] Further, the connecting groove includes a triangular groove body matching the shape of the right-angle part of the isosceles right-angled triangular prism, and the inclined surface of the isosceles right-angled triangular prism extends beyond the end surface of the plate body.

[0011] The triangular groove body is used to cooperate with the side surface of the isosceles right-angled triangular prism for limiting, ensuring the stable positioning of the isosceles right-angled triangular prism. The inclined surface part of the isosceles right-angled triangular prism is suspended, which is convenient for butt joint gluing.

[0012] Further, a connecting part is arranged on the lens tooling, and a pressing part for cooperating with the top surface of the isosceles right-angled triangular prism is arranged on the connecting part.

[0013] A connecting part is provided to position the pressing part. The pressing part presses the top surface of the isosceles right triangular prism to ensure stable positioning between the isosceles right triangular prism and the lens tooling.

[0014] Furthermore, the pressing part includes an adjusting nut threadedly connected to the connecting part, and a pressing cushion layer is provided at the bottom end of the adjusting nut.

[0015] By rotating the adjusting nut, the pressing cushion layer is made to cooperate with the top surface of the isosceles right triangular prism to ensure stable positioning and a simple structure.

[0016] Furthermore, the connecting part includes a bottom plate and a top plate. A connecting rod is provided between the bottom plate and the top plate. The bottom plate is rotatably connected to the bottom surface of the lens tooling, and the adjusting nut is screwed onto the top plate.

[0017] The connecting rod connects the bottom plate and the top plate, facilitating the rotational connection between the connecting part and the lens tooling. The position of the connecting rod can be adjusted as needed to avoid blocking light.

[0018] Furthermore, the displacement adjustment module includes a six-axis adjustment frame, and the lens tooling includes a plate body. The plate body is connected to the top of the support through fasteners.

[0019] The six-axis adjustment frame can conveniently adjust the position of the isosceles right triangular prism. The plate body has a simple structure and is convenient for installation.

[0020] Furthermore, temporary glue for connecting the isosceles right triangular prism is provided in the connecting groove, and a through hole is opened at the bottom of the connecting groove.

[0021] The isosceles right triangular prism is temporarily fixed in the connecting groove through the temporary glue, facilitating optical cementing. The through hole opened at the bottom of the connecting groove is convenient for disassembling the cube beam splitter prism after gluing.

[0022] Furthermore, the bottom of the support is fixed on the workbench, and the bottoms of the light source, the autocollimator, and the corner cube prism are all arranged on the workbench.

[0023] The bottom of the support, the light source, the autocollimator, and the corner cube prism are supported and positioned by the fixing table to ensure the stable operation of the overall device.

[0024] Compared with the prior art, the beneficial effects of the present utility model are:

[0025] 1. An optical path configuration is achieved by setting a support and a lens tooling between a light source and an autocollimator, and cooperating with two corner cube prisms. By adjusting the relative positions of the isosceles right triangular prisms on the two lens toolings, the path of the light source light is adjusted. When the light spot on the autocollimator is at the zero position, the inclined planes of the two isosceles right triangular prisms are relatively parallel, ensuring the positioning accuracy between the two isosceles right triangular prisms during optical cementing and resulting in a high product qualification rate.

[0026] 2. The cube beam splitter prism fabricated by optical cementing has higher transmittance and damage threshold. By detecting the relative positions of the inclined planes of the two isosceles right triangular prisms through the optical path, the distance between the light spot and the zero position can be observed in real time, and the positions of the isosceles right triangular prisms can be adjusted, ensuring that the angle deviation between the transmitted beam and the incident beam of the cube beam splitter prism after optical cementing is less than 10″, guaranteeing the performance of the product.

[0027] 3. The two isosceles right triangular prisms are detachably connected to the connection grooves of the lens tooling through a colloid or a pressing member, facilitating the position adjustment of the isosceles right triangular prisms and ensuring the relative positions of the isosceles right triangular prisms and the lens tooling during the cementing process. After optical cementing, the cube beam splitter prism can be conveniently disassembled, with convenient operation. Description of the Drawings

[0028] Figure 1 It is a three-dimensional structure diagram of an assembly device for a cube beam splitter prism according to Embodiment 1 of the present invention;

[0029] Figure 2 It is a three-dimensional structure diagram of a triangular groove body in Embodiment 1 of the present invention;

[0030] Figure 3 It is an optical path diagram in Embodiment 1 of the present invention;

[0031] Figure 4 It is a three-dimensional structure diagram of a connection part in Embodiment 2 of the present invention;

[0032] In the figure: 1, light source; 2, autocollimator; 3, corner cube prism; 4, through hole; 5, six-dimensional adjustment frame; 6, plate body; 7, triangular groove body; 8, adjusting nut; 9, pressing cushion; 10, bottom plate; 11, top plate; 12, connecting rod; 13, fastener; 14, front triangular prism; 15, rear triangular prism; 16, rotating shaft pin. Detailed Embodiment

[0033] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the protection scope of the present utility model. In the description of the present utility model, it should be noted that the terms "front", "rear", "left", "right", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. Embodiment 1

[0034] As Figures 1-3 shown, an assembly device for a cubic beam splitting prism includes a light source 1, an autocollimator 2, two corner cube prisms 3 and two supports. The autocollimator 2 is located in the emission direction of the light source 1. At least one of the supports includes a displacement adjustment module. A lens tooling is provided on the support. A connection groove for detachably connecting an isosceles right-angled triangular prism is provided on the lens tooling. The two lens toolings are arranged oppositely to assemble the isosceles right-angled triangular prisms into a cubic beam splitting prism. The two isosceles right-angled triangular prisms are installed between the autocollimator 2 and the light source 1. The two corner cube prisms 3 are arranged oppositely on both sides of the isosceles right-angled triangular prism. The connection direction of the two corner cube prisms 3 is perpendicular to the emission direction of the light source 1.

[0035] In the above solution, the isosceles right-angled triangular prisms are divided into a front triangular prism 14 and a rear triangular prism 15 according to the front and rear positions. The collimated light emitted by the light source 1 is vertically incident from the right-angle surface of the front triangular prism 14, and after being reflected by the inclined surface, it reaches the corner cube prism 3 on one side. The corner cube prism 3 will reflect the light parallelly. After being reflected by the two corner cube prisms 3, the light is vertically incident from the right-angle surface of the rear triangular prism 15, and after being reflected by the inclined surface of the rear triangular prism 15, it reaches the autocollimator 2. The position of the lens tooling is adjusted through the displacement adjustment module, and then the relative position of the two isosceles right-angled triangular prisms is adjusted. The connection groove is used for positioning the isosceles right-angled triangular prism. When the position of the light spot coincides with the zero position, the two isosceles right-angled triangular prisms are relatively parallel. At this time, the inclined surfaces of the two isosceles right-angled triangular prisms can be adhered by optical cement. The two lens toolings are arranged oppositely to facilitate the inclined surfaces of the isosceles right-angled triangular prisms to approach and adhere to each other. The two corner cube prisms 3 are arranged oppositely, and the connection direction is perpendicular to the emission direction of the light source 1 to achieve perpendicular incidence of the light onto the rear triangular prism 15.

[0036] Further, the connecting groove includes a triangular groove body 7 that matches the shape of the right-angle part of the isosceles right triangular prism, and the inclined plane of the isosceles right triangular prism extends beyond the end face of the plate body 6.

[0037] The triangular groove body 7 is used to cooperate with the side surface of the isosceles right triangular prism for limiting, ensuring the stable positioning of the isosceles right triangular prism. The inclined plane part of the isosceles right triangular prism is suspended, which is convenient for butt joint gluing.

[0038] Further, the displacement adjustment module includes a six-dimensional adjustment frame 5, the lens tooling includes a plate body 6, and the plate body 6 is connected to the top of the support through a fastener 13.

[0039] The six-dimensional adjustment frame 5 can conveniently adjust the position of the isosceles right triangular prism, and the plate body 6 has a simple structure and is convenient for installation.

[0040] Both supports include a six-dimensional adjustment frame 5, and the fastener 13 includes a bolt.

[0041] Further, a temporary glue for connecting the isosceles right triangular prism is provided in the connecting groove, and a through hole 4 is opened at the bottom of the connecting groove.

[0042] The isosceles right triangular prism is temporarily fixed in the connecting groove by the temporary glue, which is convenient for optical gluing. The through hole 4 opened at the bottom of the connecting groove is convenient for disassembling the cube beam splitter prism after gluing.

[0043] The temporary glue uses UV hydrolysis glue, and after gluing, the cube beam splitter prism can be separated from the lens tooling by injecting water at the connecting groove. The through hole 4 can be used for the ejector rod to pass through, which is convenient for pushing and disassembling the cube beam splitter prism.

[0044] Further, the bottom of the support is fixed on the workbench, and the bottoms of the light source 1, the autocollimator 2, and the corner cube prism 3 are all arranged on the workbench.

[0045] The support, the light source 1, the autocollimator 2, and the bottom of the corner cube prism 3 are supported and positioned by the fixing table to ensure the stable operation of the whole device. The support is connected to the workbench by bolts.

[0046] The working principle is as follows: A collimated light of a single wavelength is emitted by the light source 1; two isosceles right triangular prisms are fixed on the six-dimensional adjustment frame through the lens tooling; the corner cube prism 3 is placed on both sides. Since the corner cube prism 3 is not sensitive to the incident angle of light, within a certain range of incident angles, the light will be reflected by 180°. Therefore, the placement angle requirement of the corner cube prism 3 is relatively low, allowing a deviation within 3°.

[0047] Operation steps: Fix the autocollimator 2, adjust the light source 1 so that the collimated light emitted by the light source 1 hits the zero point of the autocollimator 2, and then fix the light source 1; Fix the isosceles right-angled prism to the lens tooling, and by adjusting the rotation and pitch of the six-axis adjustment frame 5, make the light from the light source 1 incident on the right-angled surface of the front prism 14 at an angle of 0° ± 2°. Keep the front prism 14 fixed; Adjust the angle of the rear prism 15 by adjusting the pitch and rotation of the six-axis adjustment frame, so that the light passing through the two corner cube prisms 3 and the rear prism 15 hits the zero point position of the autocollimator 2. At this time, the inclined surfaces between the front prism 14 and the rear prism 15 are parallel, and there is no relative rotation between the front prism 14 and the rear prism 15; Adjust the translation and height of the six-axis adjustment frame to make the front prism 14 and the rear prism 15 stick together to achieve optical cementing.

[0048] The optical path of this method is relatively simple and easy to adjust. It can quickly and accurately adjust the parallelism and relative rotation of the inclined surface of the isosceles right-angled prism. The angle deviation between the transmitted beam and the incident beam of the cube beam splitter prism after optical cementing is less than 10″. Embodiment 2

[0049] As Figure 4 shown, an assembly device for a cube beam splitter prism in this embodiment is further modified as follows on the basis of Embodiment 1:

[0050] Further, a connecting part is provided on the lens tooling, and a pressing part for cooperating with the top surface of the isosceles right-angled prism is provided on the connecting part.

[0051] Set the connecting part to position the pressing part, and press the top surface of the isosceles right-angled prism through the pressing part to ensure stable positioning between the isosceles right-angled prism and the lens tooling.

[0052] Further, the pressing part includes an adjusting nut 8 threadedly connected to the connecting part, and a pressing cushion layer 9 is provided at the bottom end of the adjusting nut 8.

[0053] Rotate the adjusting nut 8 to make the pressing cushion layer 9 cooperate with the top surface of the isosceles right-angled prism to ensure stable positioning and simple structure.

[0054] The pressing cushion layer 9 includes a rubber sleeve sleeved on the bottom end of the adjusting nut 8.

[0055] Further, the connecting part includes a bottom plate 10 and a top plate 11. A connecting rod 12 is provided between the bottom plate 10 and the top plate 11. The bottom plate 10 is rotatably connected to the bottom surface of the lens tooling, and the adjusting nut 8 is screwed on the top plate 11.

[0056] The connecting rod 12 connects the bottom plate 10 and the top plate 11, facilitating the rotational connection of the connecting part with the lens tooling. The position of the connecting rod 12 can be adjusted as needed to avoid blocking light.

[0057] A rotating shaft pin 16 is provided at the bottom of the bottom plate 10 for rotational connection with the bottom plate 10.

[0058] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An assembly device for a cubic beam splitter prism, characterized in that: The invention comprises a light source, an autocollimator, two corner cube prisms and two supports, wherein the autocollimator is located in the emission direction of the light source, at least one of the supports comprises a displacement adjustment module, a lens fixture is arranged on the support, a connection groove for detachably connecting an isosceles right-angle prism is provided on the lens fixture, two lens fixtures are arranged opposite to each other to assemble the isosceles right-angle prisms into a cubic beam splitter, two isosceles right-angle prisms are installed between the autocollimator and the light source, two corner cube prisms are arranged opposite to each other on both sides of the isosceles right-angle prism, and the connection direction of the two corner cube prisms is perpendicular to the emission direction of the light source.

2. The assembly device of the cubic beam splitter according to claim 1, characterized in that: The connecting groove comprises a triangular groove body whose shape matches the right-angle part of the isosceles right-angle prism, and the inclined surface of the isosceles right-angle prism exceeds the end surface of the plate body.

3. The assembly device of the cubic beam splitter according to claim 1, characterized in that: The lens tooling is provided with a connecting portion, and the connecting portion is provided with a pressing piece for matching with the top surface of the isosceles right-angle prism.

4. The assembly device for a cubic beam splitter according to claim 3, characterized in that: The clamping member comprises an adjusting nut threadedly connected to the connecting portion, and a clamping pad is arranged at the bottom end of the adjusting nut.

5. The assembly device for a cubic beam splitter according to claim 4, characterized in that: The connecting part comprises a bottom plate and a top plate, a connecting rod is arranged between the bottom plate and the top plate, the bottom plate is rotatably connected to the bottom surface of the lens tooling, and the adjusting nut is screwed on the top plate.

6. The assembly device for a cubic beam splitter according to claim 1, characterized in that: The displacement adjustment module comprises a six-dimensional adjustment frame, and the lens tooling comprises a plate body, and the plate body is connected to the top of the support through a fastener.

7. The assembly device of the cubic beam splitter according to claim 2, characterized in that: Temporary glue for connecting the isosceles right-angle prism is arranged in the connection groove, and a through hole is opened at the bottom of the connection groove.

8. The assembly device of the cubic beam splitter according to claim 1, characterized in that: The bottom of the support is fixed on the workbench, and the bottoms of the light source, the autocollimator and the corner cube prism are all arranged on the workbench.

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