Multi-refraction prism

Abstract

The utility model discloses a multi-refraction prism, which relates to the technical field of optical prisms and comprises a first prism blank block, a second prism blank block and a third prism blank block, a reflecting film is attached to the inner side of the first prism blank block, and one side, plated with the reflecting film, of the first prism blank block is glued with the inner side of the second prism blank block; and the prism blank block III is glued at the bottoms of the prism blank block I and the prism blank block II. According to the multi-refracting prism, the design of slotting in the middle of the upper bottom end surface is canceled, so that the processing difficulty and the manufacturing cost are greatly reduced; the structural stability is good, the prism is processed through bonding, the rigidity of the prism finished product is obviously higher than that of the original product structure, and the bending resistance can reach more than 20kgf; the three-in-one structure can accurately control the position precision of the black film to reach the micron order, and effectively inhibits stray light.

Description

Technical Field

[0001] This utility model relates to the field of optical prism technology, and in particular to a multi-refractive prism. Background Technology

[0002] Traditional optical prisms are isosceles triangular in shape, and their manufacturing process generally involves: cutting a long blank, rough grinding, fine grinding, polishing, optical testing, chamfering, printing, cleaning, and coating. After continuous optimization of optical design, a new type of multi-refractive prism (such as...) has emerged on the market. Figure 1 The top bottom has an irregular groove in the middle, and the groove is evenly coated with ink.

[0003] Figure 1 Existing multi-refractive prisms have the following drawbacks: 1. The central slot requires precision machining, making it difficult to guarantee rigidity and prone to breakage. 2. The slot requires high dimensional accuracy, which is difficult to achieve with precision machining, resulting in a rough surface (significant stray light) and necessitating acid etching, further complicating dimensional control. 3. The small space within the slot leads to inconsistent ink thickness during ink coating, also contributing to stray light generation. In summary, multi-refractive prisms have a unique structural design, high manufacturing difficulty, low yield, and high cost (poor dimensional accuracy, surface roughness, and performance in camera modules for stray light reduction and imaging). Utility Model Content

[0004] The purpose of this invention is to provide a multi-refractive prism to solve the problems existing in the prior art, reduce processing difficulty and manufacturing cost, and greatly improve processing efficiency and production yield.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a multi-refractive prism, comprising a prism blank block one, a prism blank block two, and a prism blank block three. The inner side of the prism blank block one is coated with a reflective film, and the side of the prism blank block one coated with the reflective film is bonded to the inner side of the prism blank block two. The bottom of the prism blank block one and the prism blank block two is bonded to the prism blank block three.

[0006] In one embodiment, light enters from one side of the prism blank block three, is refracted more than or equal to three times inside the multi-refractive prism, and then exits from the other side of the prism blank block three.

[0007] In one embodiment, the reflective film is made of a light-absorbing material.

[0008] In one embodiment, the reflective film is elongated.

[0009] In one embodiment, the prism blank block one, prism blank block two, and prism blank block three form an isosceles trapezoidal structure.

[0010] In one embodiment, the outer waist surfaces of the prism blank block one, prism blank block two, and prism blank block three are also coated with a reflective film.

[0011] The present invention achieves the following beneficial technical effects compared to the prior art:

[0012] The multi-refractive prism of this invention includes a prism blank block one, a prism blank block two, and a prism blank block three. The inner side of the prism blank block one is coated with a reflective film, and the side of the prism blank block one coated with the reflective film is bonded to the inner side of the prism blank block two. The bottom of the prism blank block one and the prism blank block two is bonded to the prism blank block three. The multi-refractive prism of this invention eliminates the need for a slotted design in the middle of the top and bottom end faces, greatly reducing processing difficulty and manufacturing costs. It has good structural stability; through bonding processing, the rigidity of the finished prism is significantly higher than that of the original product structure (e.g., ...). Figure 1 The bending strength can reach over 20 kgf; the three-in-one structure can accurately control the position accuracy of the black film to the micron level, effectively suppressing stray light. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a structural diagram of a trirefringent prism in the prior art;

[0015] Figure 2 This is a structural diagram of the trirefringent prism in this utility model;

[0016] Figure 3 This is a diagram illustrating the assembly process of the three-refractive prism in this invention.

[0017] Among them, 1. Prism blank block one; 2. Prism blank block two; 3. Prism blank block three; 4. Black film. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] The purpose of this invention is to provide a trirefringent prism to solve the problems existing in the prior art, reduce processing difficulty and manufacturing cost, and greatly improve processing efficiency and production yield.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 2-3 As shown, this utility model provides a trirefringent prism, including prism blank block one 1, prism blank block two 2 and prism blank block three 3. The inner side of prism blank block one 1 is coated with a reflective film, and the side of prism blank block one 1 coated with the reflective film is glued to the inner side of prism blank block two 2. The bottom of prism blank block one 1 and prism blank block two 2 is glued to prism blank block three 3.

[0022] The three prism blanks are bonded together using an adhesive bonding method. The processing steps are as follows: Prism blank 1 is vacuum-deposited with a black film --- bonded to prism blank 2 --- the bonded sheet is shaped (bottom surface grinding + polishing / top surface grinding) --- silkscreen printing on the top surface of the two-in-one assembly --- the two-in-one assembly is bonded to prism blank 3 (e.g., ...). Figure 3 --- Three-in-one bevel shaping and polishing (e.g.) Figure 2 ---Laser cutting---Silk screen printing on end face / waist face / bottom face---High reflective coating on waist face / anti-reflective coating on bottom face.

[0023] In one embodiment, light enters from one side of prism blank block 3, is refracted more than or equal to three times inside the prism, and then exits from the other side of prism blank block 3.

[0024] In one embodiment, the reflective film is made of a light-absorbing material, preferably a black film 4.

[0025] In one embodiment, the black film 4 can be prepared by, but is not limited to, vacuum evaporation, screen printing, centrifugal coating or exposure development. It is placed on the inner side of the prism blank block 1, and the black film 4 is in the shape of a strip. The prism black film is made of strips, and the mass evaporation followed by grinding / polishing results in good thickness consistency, which greatly improves processing efficiency and production yield.

[0026] It should be noted that prism blank block 1 is the light-emitting side (i.e., the mounting side of the image sensor), and prism blank block 2 is the light-entry side (i.e., the mounting side of the optical lens).

[0027] In one embodiment, prism blank block 1, prism blank block 2, and prism blank block 3 form an isosceles trapezoidal structure.

[0028] In one embodiment, the outer waist surfaces of prism blank 1, prism blank 2, and prism blank 3 are also coated with a high-reflection film.

[0029] The trirefringent prism of this invention has the following characteristics:

[0030] 1. The design of the groove in the middle of the top and bottom end faces has been eliminated, which greatly reduces the processing difficulty and manufacturing cost.

[0031] 2. Prism black film can be applied in long strips, mass-produced by vapor deposition, followed by grinding / polishing, resulting in excellent thickness consistency and greatly improving processing efficiency and production yield.

[0032] 3. Good structural stability; prisms are manufactured through bonding, resulting in finished prism products (such as...). Figure 3 The stiffness of the first product is significantly higher than that of the original product structure (e.g., Figure 1 Its bending strength can reach over 20 kgf.

[0033] 4. The three-in-one structure can accurately control the positional precision of the black film, reaching the micron level, and effectively suppress stray light.

[0034] 5. It has superior optical performance (high-precision refraction, low image distortion, and good stray light elimination ability); it has high processing accuracy and is easy to process.

[0035] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A multi-refractive prism, characterized in that: The device includes prism blank block one, prism blank block two, and prism blank block three. The inner side of prism blank block one is coated with a reflective film, and the side of prism blank block one coated with the reflective film is bonded to the inner side of prism blank block two. The bottom of prism blank block one and prism blank block two is bonded to prism blank block three.

2. The multi-refractive prism according to claim 1, characterized in that: The light enters from one side of the prism blank block three, and is refracted more than or equal to three times inside the multi-refractive prism, and then exits from the other side of the prism blank block three.

3. The multi-refractive prism according to claim 1, characterized in that: The reflective film is made of a light-absorbing material.

4. The multi-refractive prism according to claim 1, characterized in that: The reflective film is elongated.

5. The multi-refractive prism according to claim 1, characterized in that: The prism blank block one, prism blank block two, and prism blank block three form an isosceles trapezoidal structure.

6. The multi-refractive prism according to claim 4, characterized in that: The outer waist surfaces of prism blank block one, prism blank block two, and prism blank block three are also coated with a reflective film.

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