Optical slit device

Abstract

The utility model relates to the technical field of optical instruments, in particular to an optical slit device which comprises a base with a light hole in the center, a left slit blade and a right slit blade are hinged to the left side and the right side of the upper portion of the base respectively, a containing cavity is formed in the left slit blade, and a left cutting edge is formed on the inner wall of the left side of the containing cavity. The right slit blade is an inverted-T-shaped plate body, the two sides of the right slit blade abut against the lower surface of the left slit blade, a right cutting edge is formed at the top of the right slit blade, and the right cutting edge is inserted into the containing cavity and is opposite to the left cutting edge; a torsion spring is arranged at the hinged position of the right slit blade and the base, and a tension spring is arranged between the right end of the left slit blade and the right end of the base. The base is further provided with a spiral micrometer head, and a push rod of the spiral micrometer head abuts against the right end of the left slit blade. According to the utility model, the left slit blade and the right slit blade are turned upwards or downwards synchronously by rotating the knob of the spiral micrometer head, so that the purpose of adjusting the width of the slit is realized, the opening precision of the slit is improved, and the opening symmetry is good.

Description

Technical Field

[0001] This utility model relates to the field of optical instrument technology, and specifically to an optical slit device. Background Technology

[0002] An optical slit is an essential light-transmitting structure used in applications such as measurement and analysis that utilize the physical properties of light, including diffraction, interference, and the absorption of different wavelengths of light by different substances. Slit devices are often installed inside optical instruments such as spectrometers, and their width is adjusted according to the illumination conditions required by the user.

[0003] In existing technologies, most light sources use a wedge-shaped slider to push the left and right blades that make up the slit laterally, thus widening or narrowing the slit. The disadvantage of this structure is that the slit opening accuracy is low and the symmetry of the opening is not high. Summary of the Invention

[0004] To address the problems of low slit opening accuracy and poor opening symmetry in existing technologies where a wedge-shaped slider pushes the left and right blades forming the slit laterally to widen or narrow it, this invention proposes an optical slit device. By rotating the knob of the micrometer screw, the left and right slit blades flip up or down synchronously, achieving the purpose of adjusting the slit width between the left and right blades. The adjustment is fast and precise, improving slit opening accuracy and opening symmetry.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] An optical slit device includes a base with a centrally located light-transmitting aperture. A left slit blade and a right slit blade are hinged to the upper left and right sides of the base, respectively. The left slit blade has a receiving cavity, and the left inner wall of the receiving cavity forms a left cutting edge. The right slit blade is a convex-shaped plate, with its two sides abutting against the lower surface of the left slit blade. The top of the right slit blade forms a right cutting edge, which is inserted into the receiving cavity and positioned opposite the left cutting edge. A torsion spring is provided at the hinge point between the right slit blade and the base, and a tension spring is provided between the right end of the left slit blade and the right end of the base. A micrometer screw is also provided on the base, with its push rod passing through the upper surface of the base and pressing against the right end of the left slit blade. The gap between the left and right cutting edges is the slit width. By rotating the knob of the micrometer screw, the left and right slit blades rotate synchronously upwards or downwards, achieving adjustment of the slit width between the left and right cutting edges.

[0007] Furthermore, a mounting groove is provided in the upper center of the base, and the light-transmitting hole penetrates the bottom of the mounting groove.

[0008] Furthermore, the left slit blade is inclined with its left side lower than its right side, and a shaft hole is opened at the left end of the left slit blade. A rotating shaft passes through the shaft hole, and the two ends of the rotating shaft are set on the inner wall of the mounting groove. The left slit blade rotates around the rotating shaft.

[0009] Furthermore, the right slit blade is inclined with its left side higher than its right side, and a second shaft hole is opened at the right end of the right slit blade. A second rotating shaft passes through the second shaft hole, and both ends of the second rotating shaft are set on the inner wall of the mounting groove. The right slit blade rotates around the second rotating shaft.

[0010] Furthermore, two torsion springs are provided, and two notches are formed on the right slit blade. The torsion springs are located within the notches and are fitted onto the second rotating shaft. The two ends of the torsion springs press against the right slit blade and the base, respectively. By utilizing the elastic force of the torsion springs, the right slit blade is positioned at the angle after rotation.

[0011] Furthermore, the tension springs are configured as two and symmetrically distributed on the front and rear sides of the micrometer head. Grooves are provided on both the right slit blade and the base, and connecting plates are provided in the grooves. The spring hooks at both ends of the tension springs hook onto the two connecting plates respectively.

[0012] Furthermore, the base has a through hole for the micrometer screw to pass through, and the side wall of the base has a threaded hole that communicates with the through hole, and a bolt is threaded into the threaded hole.

[0013] Furthermore, it also includes two limiting blocks, which are symmetrically distributed on the front and rear sides of the base. Bolts are used to secure the micrometer head.

[0014] Furthermore, a mounting hole is provided at the rear center of the base. The mounting hole is a threaded hole for connection with the optical base.

[0015] The beneficial effects of this utility model through the above technical solution are as follows:

[0016] This invention employs a micrometer screw to ensure adjustment accuracy. Turning the knob of the micrometer screw clockwise raises its push rod, which acts on the right end of the left slit blade, overcoming the tension spring's force. The left slit blade flips upward, and simultaneously, under the force of the torsion spring, the right slit blade flips upward, increasing the slit width between the left and right blades. Similarly, turning the knob counterclockwise lowers the push rod, and under the force of the tension spring, the left slit blade flips downward, pressing against the right slit blade and overcoming the torsion spring's force. The right slit blade flips downward, decreasing the slit width between the left and right blades. Therefore, the left and right slit blades flip upward or downward simultaneously with equal movement, achieving slit width adjustment quickly and accurately. This eliminates the problems caused by the wedge-shaped slider structure, improving slit opening accuracy and ensuring good opening symmetry. Attached Figure Description

[0017] Figure 1 This utility model provides a three-dimensional optical slit device. Figure 1 ;

[0018] Figure 2 This utility model provides a three-dimensional optical slit device. Figure 2 ;

[0019] Figure 3 This is a top view of an optical slit device according to the present invention;

[0020] Figure 4 This utility model relates to an optical slit device. Figure 3 Sectional view at point AA;

[0021] Figure 5 This is a right view of an optical slit device according to the present invention;

[0022] Figure 6 This is a schematic diagram of the left and right slit blades in an optical slit device according to the present invention;

[0023] Figure 7 This is a schematic diagram showing the connection relationship between the right slit blade, the second rotating shaft, and the torsion spring in an optical slit device according to this utility model.

[0024] Figure 8 This is a schematic diagram of the base in an optical slit device according to the present invention.

[0025] The numbers in the attached diagram are:

[0026] 1. Light-transmitting hole; 2. Base; 3. Left slit blade; 4. Right slit blade; 5. Receiving cavity; 6. Left blade; 7. Right blade; 8. Torsion spring; 9. Tension spring; 10. Micrometer screw; 11. Mounting groove; 12. Shaft hole one; 13. Rotating shaft one; 14. Shaft hole two; 15. Rotating shaft two; 16. Groove; 17. Connecting plate; 18. Through hole; 19. Threaded hole; 20. Bolt; 21. Limiting block; 22. Mounting hole. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0028] like Figures 1-8 As shown, this embodiment provides an optical slit device, including a base 2 with a light-transmitting hole 1 in the center. A left slit blade 3 and a right slit blade 4 are respectively hinged to the left and right sides of the upper part of the base 2. The left slit blade 3 has a receiving cavity 5, and the left inner wall of the receiving cavity 5 forms a left blade 6. The right slit blade 4 is a convex plate, with both sides of the right slit blade 4 abutting against the lower surface of the left slit blade 3. The top of the right slit blade 4 forms a right blade 7, which is inserted into the receiving cavity 5 and is positioned opposite to the left blade 6. The gap between the left blade 6 and the right blade 7 is the slit width. A torsion spring 8 is provided at the hinge point between the right slit blade 4 and the base 2, and a tension spring 9 is provided between the right end of the left slit blade 3 and the right end of the base 2. A micrometer screw 10 is also provided on the base 2, and the push rod of the micrometer screw 10 passes through the upper surface of the base 2 and abuts against the right end of the left slit blade 3.

[0029] With the above-described structure, rotating the knob of the micrometer screw head 10 clockwise raises the push rod of the micrometer screw head 10. The push rod acts on the right end of the left slit blade 3, overcoming the elastic force of the tension spring 9, causing the left slit blade 3 to flip upwards. Simultaneously, under the elastic force of the torsion spring 8, the right slit blade 4 flips upwards in sync, increasing the slit width between the left blade 6 and the right blade 7. Similarly, rotating the knob of the micrometer screw head 10 counterclockwise lowers the push rod of the micrometer screw head 10. Under the action of the tension spring 9, the left slit blade 3 flips downwards, pressing against the right slit blade 4 and overcoming the elastic force of the torsion spring 8. The right slit blade 4 flips downwards in sync, decreasing the slit width between the left blade 6 and the right blade 7. Therefore, during the slit width adjustment process, the left slit blade 3 and the right slit blade 4 flip upwards or downwards simultaneously, and their movements are equal, resulting in good symmetry of the opening.

[0030] In this embodiment, a mounting groove 11 is provided in the middle of the upper part of the base 2, and the light-transmitting hole 1 penetrates the bottom of the mounting groove 11. The purpose of providing the light-transmitting hole 1 is to facilitate the passage of the light source.

[0031] Specifically, please refer to [the relevant document] again. Figure 4 and Figure 6 The left slit blade 3 is inclined with its left side lower than its right side. A shaft hole 12 is opened at the left end of the left slit blade 3, and a rotating shaft 13 passes through the shaft hole 12. The two ends of the rotating shaft 13 are set on the inner wall of the mounting groove 11. The left slit blade 3 rotates around the rotating shaft 13.

[0032] Furthermore, the right slit blade 4 is inclined with its left side higher than its right side, and a shaft hole 14 is provided at the right end of the right slit blade 4. A rotating shaft 15 passes through the shaft hole 14, and both ends of the rotating shaft 15 are set on the inner wall of the mounting groove 11. The right slit blade 4 rotates around the rotating shaft 15.

[0033] Please refer to it again. Figure 7 Two torsion springs 8 are provided. Two notches are opened on the right slit blade 4, and the torsion springs 8 are located in the notches. The torsion springs 8 are fitted on the rotating shaft 15, and the two ends of the torsion springs 8 press against the right slit blade 4 and the base 2 respectively. Through the structure of double torsion springs 8, the force on the right slit blade 4 can be ensured to be uniform, and the elastic force of the torsion springs 8 can be used to position the right slit blade 4 at the angle after rotation.

[0034] In this embodiment, two tension springs 9 are symmetrically distributed on the front and rear sides of the micrometer head 10. Grooves 16 are provided on both the right slit blade 4 and the base 2, and connecting plates 17 are disposed within the grooves 16. Spring hooks at both ends of the tension springs 9 hook onto the two connecting plates 17 respectively. The tension springs 9 need to have a certain preload to ensure that the left slit blade 3 fits against the right slit blade 4.

[0035] Please refer to this again. Figure 8 The base 2 has a through hole 18 for the micrometer screw gauge 10 to pass through, and a threaded hole 19 communicating with the through hole 18 is provided on the side wall of the base 2. A bolt 20 is threaded into the threaded hole 19. The bolt 20 is used to fix the micrometer screw gauge 10. It should be noted that the micrometer screw gauge 10 used in this utility model is the VSJ-25B type sold by Dongguan Zhangmutou Hongzhun Measuring Tools Business Department, and the manufacturer is Qinghai Measuring Tools & Cutting Tools Co., Ltd.

[0036] It is worth mentioning that two limiting blocks 21 are also included, which are symmetrically distributed on the front and rear sides of the base 2. By setting the limiting blocks 21, the rotation angle of the left slit blade 3 or the right slit blade 4 is limited.

[0037] Please refer again. Figure 2 The base 2 has a mounting hole 22 at the rear center. The mounting hole 22 is a threaded hole 19, used for connecting to the optical base 2.

[0038] The working principle of this utility model is as follows:

[0039] Turn the knob of the micrometer screw head 10 clockwise, and the push rod of the micrometer screw head 10 rises. The push rod of the micrometer screw head 10 acts on the right end of the left slit blade 3 and overcomes the elastic force of the tension spring 9. The left slit blade 3 flips upward. At the same time, under the elastic force of the torsion spring 8, the right slit blade 4 flips upward synchronously, and the slit width between the left blade 6 and the right blade 7 increases.

[0040] When the knob of the micrometer head 10 is turned counterclockwise, the push rod of the micrometer head 10 descends. Under the action of the tension spring 9, the left slit blade 3 flips downward. The left slit blade 3 presses against the right slit blade 4 and overcomes the elastic force of the torsion spring 8. The right slit blade 4 flips downward in sync, and the slit width between the left blade 6 and the right blade 7 decreases.

[0041] During the slit width adjustment process described above, the left slit blade 3 and the right slit blade 4 flip up or down simultaneously, and the amount of movement of the two blades is equal.

[0042] In summary, this utility model uses a micrometer screw head 10 to ensure adjustment accuracy. When the knob of the micrometer screw head 10 is turned, the left slit blade 3 and the right slit blade 4 rotate upward or downward simultaneously, and the amount of movement of the two is equal, so as to achieve the purpose of adjusting the slit width. The adjustment is fast and accurate, eliminating the problems caused by the structure of the wedge slider, and improving the slit opening accuracy and opening symmetry.

[0043] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. An optical slit device comprising a base (2) having a light-transmitting hole (1) in the center, characterized in that, The left slit blade (3) and the right slit blade (4) are hingedly connected to the left and right sides of the base (2) respectively, the left slit blade (3) is provided with a containing cavity (5), and the left side inner wall of the containing cavity (5) forms a left blade edge (6); the right slit blade (4) is a convex-shaped plate body, the two sides of the right slit blade (4) abut against the lower surface of the left slit blade (3), the top of the right slit blade (4) forms a right blade edge (7), the right blade edge (7) is inserted into the containing cavity (5) and is oppositely arranged with the left blade edge (6); the hinged connection between the right slit blade (4) and the base (2) is provided with a torsion spring (8), and the right end of the left slit blade (3) and the right end of the base (2) are provided with a tension spring (9); the base (2) is further provided with a screw micrometer head (10), the push rod of the screw micrometer head (10) penetrates through the upper surface of the base (2) and abuts against the right end of the left slit blade (3).

2. An optical slit device according to claim 1, characterized in that The middle part of the base (2) is provided with a mounting groove (11), and the light transmission hole (1) penetrates through the bottom of the mounting groove (11).

3. An optical slit device according to claim 2, wherein The left slit blade (3) is arranged in a left-low-right-high inclined manner, the left end of the left slit blade (3) is provided with a shaft hole one (12), a rotating shaft one (13) is arranged in the shaft hole one (12), and the two ends of the rotating shaft one (13) are arranged on the inner wall of the mounting groove (11).

4. An optical slit device according to claim 2, wherein The right slit blade (4) is arranged in a left-high-right-low inclined manner, the right end of the right slit blade (4) is provided with a shaft hole two (14), a rotating shaft two (15) is arranged in the shaft hole two (14), and the two ends of the rotating shaft two (15) are arranged on the inner wall of the mounting groove (11).

5. An optical slit device according to claim 4, wherein The torsion spring (8) is provided in two, two notches are formed in the right slit blade (4), the torsion spring (8) is arranged in the notch, the torsion spring (8) is sleeved on the rotating shaft two (15), and the two ends of the torsion spring (8) are respectively abutted against the right slit blade (4) and the base (2).

6. An optical slit device according to claim 1, wherein The tension spring (9) is provided in two and symmetrically arranged on the front and rear sides of the screw micrometer head (10), recesses (16) are formed in the right slit blade (4) and the base (2), connecting plates (17) are arranged in the recesses (16), and the spring hooks at the two ends of the tension spring (9) respectively hook two connecting plates (17).

7. An optical slit device according to claim 1, wherein A through hole (18) is formed in the base (2) and used for penetrating the screw micrometer head (10), a threaded hole (19) is formed in the side wall of the base (2) and communicated with the through hole (18), and a bolt (20) is threadedly connected in the threaded hole (19).

8. An optical slit device according to claim 1, wherein Two limiting blocks (21) are further arranged on the front and rear sides of the base (2).

9. An optical slit device according to claim 1, wherein An installation hole (22) is formed in the middle part of the rear of the base (2).

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