High-transmission low-reflection micro-prism

Abstract

The utility model discloses a kind of high-transmittance low-reflection micro-prism, it is related to prism field, and this kind of high-transmittance low-reflection micro-prism includes mirror seat and mirror cap, the middle part of mirror seat top surface has a positioning cavity, the top surface of mirror seat is located the both sides of positioning cavity and is formed with side plate, the middle part of the opposite side of two side plates is formed with longitudinally extending convex rib, mirror cap is inserted in the upper portion of two side plates;This kind of high-transmittance low-reflection micro-prism is cooperatively arranged by the positioning plug rod fixed symmetrically in mirror cap inner wall, the gap between black prism and side plate and the surface positioning hole of light barrier, so that the positioning plug rod can be inserted into positioning hole through gap, automatically limit light barrier position, ensure that light transmission hole and mirror cap round hole are accurately opposite, without manual calibration, improve the positioning precision and operation convenience.

Description

Technical Field

[0001] This utility model relates to the field of prisms, and in particular to a high-transmittance, low-reflection micro prism. Background Technology

[0002] Miniature prisms often employ a combination structure of a base, a cap, and a prism. Their optical performance is enhanced by using high-transmittance glass and anti-reflective coatings. They are widely used in fields such as miniature imaging and sensing. However, during assembly, manual adjustment of component positions is required to ensure optical path alignment.

[0003] In traditional techniques, the light-transmitting hole of the light-blocking plate and the round hole of the lens cap need to be manually aligned and then glued together. This process is not only cumbersome and the positioning accuracy is easily affected by human intervention, but also difficult to disassemble after the glue has cured. Subsequent replacement and maintenance of the prism and black prism are inconvenient, and the optical performance stability may be affected by the aging of the glue. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, the purpose of this invention is to provide a high-transmittance, low-reflection micro prism that solves the problem that the light-transmitting hole of the light-blocking plate and the circular hole of the lens cap need to be manually calibrated and positioned in the existing technology.

[0005] To address the problems in the existing technology, the technical solution of this utility model is as follows: A high-transmittance, low-reflection micro prism includes a base and a cap. The cap is detachably mounted on the base. A prism is inserted between two side plates of the base. The bottom of the prism is inserted into a positioning cavity on the surface of the base. An oblique groove is formed on the opposite side of each of the two side plates. A longitudinally extending rib is formed in the middle of the opposite side of each of the two side plates. A light-blocking plate is inserted into the two oblique grooves. The lower part of the light-blocking plate has a light-transmitting hole. The light-blocking plate is attached to one side of the prism. The light-blocking plate has a black prism on the side away from the prism. The black prism is inserted between the two side plates. The inner side of the lens cap has a limiting structure that limits the position of the light-blocking plate. The limiting structure ensures that the light-transmitting hole on the light-blocking plate is aligned with the round hole on the lens cap.

[0006] Optionally, the lens cap is inserted into the upper part of the two side plates, the top of the side plates abuts against the inner wall of the lens cap, and a hemispherical protrusion is formed at the upper end of the opposite side of the two convex ribs. A groove is formed on the inner wall of the lens cap corresponding to the position of the protrusion, and the protrusion is inserted into the groove. A baffle is fixed on a longitudinal side wall of the side plate away from the prism, and the side of the prism away from the light-blocking plate abuts against the surface of the baffle.

[0007] Optionally, several pads are fixed on opposite sides of the two side plates. The pads are all located on the side of the light-blocking plate away from the prism. The two sides of the prism abut against the surfaces of the pads on both sides. The pads create a gap between the outer wall of the prism and the side plates. The prism is confined within the space enclosed by the prism cap, side plates, light-blocking plate and baffle.

[0008] Optionally, a clearance groove is formed on one side of the lens cap, and the upper part of the light-blocking plate passes through the clearance groove. The limiting structure includes two positioning rods symmetrically fixed to the inner wall of the lens cap. Each positioning rod is directly opposite a gap on one side of the prism, and the lower end of the positioning rod passes through the gap and is inserted into the positioning hole on the surface of the light-blocking plate.

[0009] Compared with the prior art, the advantages of this utility model are as follows: This invention utilizes a combination of symmetrically fixed positioning rods on the inner wall of the lens cap, gaps between the prism and the side plate, and positioning holes on the surface of the light-blocking plate. This allows the positioning rods to pass through the gaps and insert into the positioning holes, automatically defining the position of the light-blocking plate and ensuring precise alignment between the light-transmitting hole and the round hole of the lens cap. This eliminates the need for manual calibration, improving positioning accuracy and ease of operation.

[0010] This utility model features a snap-fit ​​connection structure between the hemispherical protrusion on the side plate rib and the slot on the inner wall of the lens cap. During installation, the protrusion deforms and snaps into the slot. During disassembly, external force can be applied to disengage the protrusion from the slot. No additional fasteners are required, which achieves the effect of quick disassembly and assembly of the lens cap and lens base, and more convenient replacement and maintenance of subsequent parts. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0012] Figure 2 This is a schematic diagram of the baffle position structure of this utility model.

[0013] Figure 3 This is a schematic diagram of the gasket structure of this utility model.

[0014] Figure 4 This is a schematic diagram of the inclined groove structure of this utility model.

[0015] Figure 5 This is a schematic diagram of the positioning insert structure of this utility model.

[0016] Reference numerals in the attached drawings: 1. Lens base; 2. Lens cap; 3. Positioning cavity; 4. Side plate; 5. Protruding rib; 6. Protrusion; 7. Slot; 8. Prism; 9. Inclined groove; 10. Light-blocking plate; 11. Light-transmitting hole; 12. Clearance groove; 13. Dark prism; 14. Baffle; 15. Pad; 16. Positioning rod; 17. Positioning hole; 18. Round hole; 19. Gap. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Please see Figures 1 to 5 This embodiment provides a high-transmittance, low-reflection microprism, including a base 1 and a cap 2. The top surface of the base 1 has a positioning cavity 3 in the middle. Side plates 4 are formed on both sides of the top surface of the base 1 located in the positioning cavity 3. Longitudinal ribs 5 are formed in the middle of the opposite side of the two side plates 4. The ribs 5 enhance the strength of the side plates 4. The cap 2 is inserted into the upper part of the two side plates 4. The top of the side plates 4 abuts against the inner wall of the cap 2. Hemispherical protrusions 6 are formed at the upper ends of the opposite side of the two ribs 5. A groove 7 is formed on the inner wall of the cap 2 corresponding to the position of the protrusions 6. The protrusions 6 are inserted into the groove 7. The cap 2 and the base 1 constitute the main structure supporting the prism 8 and the black prism 13. When installing the cap 2, the cap 2 is aligned with the two side plates 4 and inserted. During the insertion process, the protrusions 6 are squeezed to deform them until they are inserted into place. The protrusions 6 return to their shape and abut against the groove 7, thus connecting the cap 2 to the base 1.

[0019] A prism 8 is inserted between the two side plates 4. The bottom of the prism 8 is inserted into the positioning cavity 3. An inclined groove 9 is opened on the opposite side of the two side plates 4. A light-blocking plate 10 is inserted into the two inclined grooves 9. The lower part of the light-blocking plate 10 has a light-transmitting hole 11. The light-blocking plate 10 fits against one side of the prism 8. An avoidance groove 12 is formed on one side of the lens cap 2. The upper part of the light-blocking plate 10 passes through the avoidance groove 12. The avoidance groove 12 is used for the lens cap 2 to avoid the light-blocking plate 10.

[0020] A prism 13 is provided on the side of the light-blocking plate 10 away from the prism 8. The prism 13 is inserted between two side plates 4. A baffle 14 is fixed on a longitudinal side wall of the side plate 4 away from the prism 8. The side of the prism 13 away from the light-blocking plate 10 abuts against the surface of the baffle 14. After the prism 8 and the light-blocking plate 10 are installed in place, the prism 13 is inserted and then the prism 13 is limited between the two side plates 4 by the baffle 14. The bottom of the prism 13 is supported in the positioning cavity 3 to limit the prism 13 between the side plates 4.

[0021] Among them, prism 8 is made of H-K9L optical glass (visible light transmittance of over 90%), and the optical surface is coated with MgF2 antireflection film (reflectivity ≤0.5%). The light-blocking sheet 10 is made of blackened metal sheet (stray light absorption rate ≥90%), and the black prism 13 is made of light-absorbing glass (reflectivity ≤5%), thereby achieving the effect of high transmittance and low reflection.

[0022] Several pads 15 are fixed on opposite sides of the two side plates 4. The pads 15 are located on the side of the light-blocking plate 10 away from the prism 8. The two sides of the prism 13 abut against the surfaces of the pads 15 on both sides. Under the action of the pads 15, the stability of the prism 13 is ensured, so that it cannot sway horizontally between the two side plates 4. At the same time, a gap 19 is formed between the outer wall of the prism 13 and the side plate 4. The prism 13 is then confined within the space enclosed by the lens cap 2, the side plate 4, the light-blocking plate 10 and the baffle 14.

[0023] Two positioning rods 16 are symmetrically fixed to the inner wall of the lens cap 2. Each positioning rod 16 is aligned with a gap 19 on one side of the prism 13, and the lower end of the positioning rod 16 passes through the gap 19 and is inserted into the positioning hole 17 on the surface of the light-blocking plate 10. After the prism 8, the light-blocking plate 10 and the prism 13 are all installed in place, the position of the light-blocking plate 10 is adjusted up and down while installing the lens cap 2 to ensure that the positioning hole 17 is aligned with the positioning rod 16. Finally, the light-blocking plate 10 is fully inserted into the lens cap 2, and the lens cap 2 is installed in place. The positioning rod 16 is inserted into the positioning hole 17 to position the light-blocking plate 10, ensuring that the light-transmitting hole 11 on the light-blocking plate 10 is aligned with the round hole 18 on the lens cap 2, which is conducive to imaging. Compared with the traditional method of manually calibrating to ensure that the light-transmitting hole 11 and the round hole 18 are in place and then using glue to fix the position, the operation is more convenient, the positioning is more accurate, and it is easier to disassemble and replace the prism 8 and the prism 13.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-transmission low-reflection micro-prism, comprising a mirror base (1) and a mirror cap (2), the mirror cap (2) being detachably mounted on the mirror base (1), characterized in that, A prism (8) is inserted between the two side plates (4) of the mirror base (1). The bottom of the prism (8) is inserted into the positioning cavity (3) on the surface of the mirror base (1). An inclined groove (9) is opened on the opposite side of the two side plates (4). A light-blocking plate (10) is inserted into the two inclined grooves (9). The lower part of the light-blocking plate (10) has a light-transmitting hole (11). The light-blocking plate (10) fits against one side of the prism (8). The light-blocking plate (10) has a black prism (13) on the side away from the prism (8). The black prism (13) is inserted between the two side plates (4). The inner side of the lens cap (2) has a limiting structure that limits the position of the light-blocking plate (10). The limiting structure ensures that the light-transmitting hole (11) on the light-blocking plate (10) is aligned with the round hole (18) on the lens cap (2).

2. The high-transmission low-reflection microprism according to claim 1, wherein Both of the two side plates (4) have longitudinally extending ribs (5) formed in the middle of the opposite side.

3. The high-transmission low-reflection microprism according to claim 2, wherein The lens cap (2) is inserted into the upper part of the two side plates (4). The top of the side plates (4) abuts against the inner wall of the lens cap (2). The upper ends of the two protruding ribs (5) on opposite sides are formed with hemispherical protrusions (6). The inner wall of the lens cap (2) is formed with a slot (7) corresponding to the position of the protrusion (6). The protrusion (6) is inserted into the slot (7).

4. The high transmission low reflection microprism according to claim 1, wherein, A baffle (14) is fixed on one of the longitudinal sidewalls of the side plate (4) facing away from the prism (8), and the side of the prism (13) facing away from the light-blocking plate (10) abuts against the surface of the baffle (14).

5. The high-transmission low-reflection microprism according to claim 4, wherein Several pads (15) are fixed on opposite sides of the two side plates (4). The pads (15) are located on the side of the light-blocking plate (10) away from the prism (8). The two sides of the prism (13) respectively abut against the surfaces of the pads (15). The pads (15) make a gap (19) between the outer wall of the prism (13) and the side plate (4). The prism (13) is confined within the space enclosed by the lens cap (2), the side plate (4), the light-blocking plate (10) and the baffle (14).

6. The high-transmittance, low-reflection microprism according to claim 1, characterized in that, A clearance groove (12) is formed on one side of the lens cap (2), and the upper part of the light-blocking plate (10) passes through the clearance groove (12).

7. The high-transmission low-reflection microprism according to claim 5, wherein The limiting structure includes two positioning rods (16) symmetrically fixed on the inner wall of the lens cap (2). Each positioning rod (16) is opposite to a gap (19) on one side of the prism (13), and the lower end of the positioning rod (16) passes through the gap (19) and is inserted into the positioning hole (17) on the surface of the light-blocking plate (10).

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