Low-loss automatic diaphragm

Abstract

The utility model discloses a low-loss automatic diaphragm, which comprises an upper cover, a base, a moving ring, a motor and a blade group, the upper cover is covered on the base to form a moving space, the blade group and the moving ring are movably connected in the moving space, the blade group is rotatably connected with the bottom wall of the base, the moving ring is arranged between the blade group and the upper cover, and the motor is connected with the moving ring. The upper cover and the base are provided with communicated light holes in a penetrating mode, the movable ring can rotate around the circle center of the light holes, a limiting piece used for limiting the movable ring to deviate from the circle center of the light holes to rotate is further arranged in the movable space, and a plurality of balls are arranged on the side, away from the upper cover, of the movable ring and evenly distributed around the circle center of the light holes. The movable ring is supported above the blade group through the balls; and the motor and the movable ring are in transmission through a gear. The diaphragm provided by the utility model has the effect of reducing the mechanical wear of the diaphragm in the long-term use process.

Description

Technical Field

[0001] The utility model relates to the field of low-loss automatic diaphragms, in particular to a low-loss automatic diaphragm. Background Art

[0002] In optical systems, the iris plays a vital role. It controls the amount of light passing through the optical system by changing the size of the aperture between the blades through a dynamic ring drive, thereby affecting key parameters such as image brightness, contrast, resolution, and depth of field. In traditional optical equipment, there are many problems with the adjustment method of the iris. For example, some manually adjusted irises require the operator to manually rotate the adjustment ring to change the iris aperture. This method is highly dependent on the operator's experience and skills in terms of accuracy. Moreover, in some application scenarios where frequent iris adjustment is required, such as dynamic optical experiments in scientific research and automated optical detection equipment, manual adjustment methods are inefficient and cannot meet the needs of fast and accurate iris adjustment.

[0003] While some automatic irises exist on the market, existing drive systems still have drawbacks. Some mechanically driven irises, such as those utilizing cams or linkages, are complex and prone to mechanical wear over time, resulting in reduced iris adjustment accuracy. Furthermore, these mechanical drive systems have limited response speeds, making it difficult to adjust the iris aperture in a timely manner when high-speed adjustment is required. Utility Model Content

[0004] In order to reduce the mechanical wear of the diaphragm during long-term use, the utility model provides a low-loss automatic diaphragm.

[0005] The utility model provides a technical solution that adopts the following:

[0006] A low-loss automatic diaphragm comprises an upper cover, a base, a moving ring, a motor and a blade group. The upper cover is connected to the base to form an active space. The blade group and the moving ring are movably connected in the active space. The blade group is rotatably connected to the bottom wall of the base. The moving ring is arranged between the blade group and the upper cover. The upper cover and the base are penetrated by a connected light-transmitting hole. The moving ring can rotate around the center of the light-transmitting hole. A limiting member for limiting the rotation of the moving ring away from the center of the light-transmitting hole is also provided in the active space. A plurality of balls are provided on the side of the moving ring away from the upper cover. The plurality of balls are evenly distributed around the center of the light-transmitting hole. The moving ring is supported above the blade group by the balls. The motor and the moving ring are driven by gears.

[0007] Start the motor, and the motor drives the gear between the click and the dynamic ring to rotate, which in turn causes the dynamic ring to move, thereby driving the blade group to open and close, and realizing the opening and closing of the diaphragm. Compared with the traditional actuator column support method, the ball bearing on the bottom wall of the dynamic ring has less friction resistance driven by the rotation of the dynamic ring, and the contact area of ​​the ball bearing and the base is smaller. Therefore, compared with the actuator column, the ball bearing is less prone to wear and makes less noise, which is beneficial to improving the overall performance of the product, reducing the mechanical wear of the diaphragm during long-term use, and increasing the service life of the diaphragm.

[0008] Preferably, the driving shaft of the motor is provided with an output gear, the outer circumference of the moving ring is integrally connected with an arc-shaped rack, the rack is arranged in contact with the outer circumference of the moving ring, and the output gear is meshed with the rack.

[0009] The arc-shaped rack meshes with the output gear, and the dynamic ring can be driven to rotate through a first-stage transmission, which is conducive to simplifying the driving method of the dynamic ring, making the driving of the dynamic ring more sensitive, and is conducive to improving the accuracy of the aperture precision adjustment.

[0010] Preferably, the motor is arranged on the upper cover, the driving shaft of the motor passes through the upper cover, and the output gear is arranged in the movable space.

[0011] The motor is large in size, and setting it on the upper cover can avoid the situation where the motor setting causes the aperture housing to become larger. At the same time, the upper cover can support the motor, which is conducive to making full use of the existing structure for the setting of other structures, making the overall structural setting more reasonable.

[0012] Preferably, the ball bearings are steel balls.

[0013] The setting of the steel ball makes the ball less likely to wear and makes the rotation of the dynamic ring smoother.

[0014] Preferably, the balls are ceramic balls.

[0015] The setting of the ceramic ball makes the ball less prone to wear and makes the rotation of the dynamic ring smoother.

[0016] Preferably, a spherical groove for mounting a ball is recessed on a side of the moving ring away from the upper cover, and an opening diameter of the spherical groove is smaller than a diameter of the ball.

[0017] By limiting the diameter of the spherical groove, the ball can be firmly installed in the spherical groove. The ball can roll freely in the spherical groove, converting the original sliding friction of the actuator into the rolling friction of the ball, making the ball less prone to wear and making the rotation of the dynamic ring smoother and more sensitive.

[0018] Preferably, the limiting member includes a limiting ring, which is fixedly connected to the side of the moving ring close to the upper cover, and the inner bottom wall of the upper cover is recessed with a limiting groove adapted to the limiting ring, and the limiting groove is correspondingly set as an annular groove.

[0019] When the moving ring rotates, the limiting ring rotates synchronously in the limiting groove. The cooperation between the limiting ring and the limiting groove limits the horizontal movement of the moving ring, so that the moving ring can rotate steadily around the center of the light-transmitting hole.

[0020] In summary, the present invention has the following beneficial technical effects:

[0021] Start the motor, which drives the gears between the click and the dynamic ring to rotate, thereby causing the dynamic ring to move, thereby driving the blade group to open and close, and realizing the opening and closing of the diaphragm. Compared with the traditional actuating column support method, the ball bearing on the bottom wall of the dynamic ring has less friction resistance driven by the rotation of the dynamic ring, and the contact area of ​​the ball bearing and the base is smaller. Therefore, compared with the actuating column, the ball bearing is less prone to wear and noise, which is beneficial to improving the overall performance of the product and the service life of the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a low-loss automatic aperture of the utility model.

[0023] Figure 2 It is a schematic diagram used to illustrate the internal structure of the optical cable.

[0024] Figure 3 It is a schematic diagram used to illustrate the distribution of balls.

[0025] Explanation of the accompanying symbols: 1. Upper cover; 2. Base; 3. Moving ring; 4. Motor; 5. Blade group; 6. Activity space; 7. Light-transmitting hole; 8. Ball; 9. Output gear; 10. Rack; 11. Limiting ring; 12. Limiting groove. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-3 The utility model is described in further detail.

[0027] The embodiment of the utility model discloses a low-loss automatic aperture.

[0028] Reference Figure 1 as well as Figure 2A low-loss automatic aperture comprises an upper cover 1, a base 2, a moving ring 3, a motor 4 and a blade group 5. The upper cover 1 is connected to the base 2 to form an active space 6. The blade group 5 and the moving ring 3 are movably connected in the active space 6. The blade group 5 is rotatably connected to the bottom wall of the base 2. The moving ring 3 is arranged between the blade group 5 and the upper cover 1. The upper cover 1 and the base 2 are penetrated by a connected light-transmitting hole 7. The moving ring 3 can rotate around the center of the light-transmitting hole 7. A limiting member for limiting the rotation of the moving ring 3 from the center of the light-transmitting hole 7 is also provided in the active space 6. A plurality of balls 8 are provided on the side of the moving ring 3 away from the upper cover 1. The plurality of balls 8 are evenly distributed around the center of the light-transmitting hole 7. The moving ring 3 is supported above the blade group 5 by the balls 8; the motor 4 and the moving ring 3 are driven by gears.

[0029] Start the motor 4, which drives the gear between the click and the dynamic ring 3 to rotate, thereby moving the dynamic ring 3, thereby driving the blade group 5 to open and close, and realizing the opening and closing of the diaphragm. The ball 8 on the bottom wall of the dynamic ring 3 is less resistant to wear and tear than the traditional actuating column support method. The friction resistance driven by the rotation of the dynamic ring 3 is smaller, and the contact area of ​​the ball 8 with the base 2 is smaller. Therefore, compared with the actuating column, the ball 8 is less likely to wear and makes less noise, which is beneficial to improving the overall performance of the product and the service life of the diaphragm.

[0030] The connection method between the dynamic ring 3 and the blade group 5 and the driving method of the blade group 5 are existing technologies and will not be described in detail here.

[0031] Reference Figure 2 as well as Figure 3 In this embodiment, the driving shaft of the motor 4 is provided with an output gear 9, and the outer periphery of the dynamic ring 3 is integrally connected with an arc-shaped rack 10. The rack 10 is arranged in contact with the outer periphery of the dynamic ring 3, and the output gear 9 is engaged with the rack 10.

[0032] The arc-shaped rack 10 meshes with the output gear 9, and can drive the dynamic ring 3 to rotate through a first-stage transmission, which is conducive to simplifying the driving method of the dynamic ring 3, making the driving of the dynamic ring 3 more sensitive, and is conducive to improving the accuracy of the aperture precision adjustment.

[0033] Reference Figure 2 as well as Figure 3 In this embodiment, the motor 4 is disposed on the upper cover 1 , the driving shaft of the motor 4 passes through the upper cover 1 , and the output gear 9 is disposed in the movable space 6 .

[0034] The motor 4 is relatively large in size, and the method of setting it on the upper cover 1 can avoid the situation where the setting of the motor 4 causes the size of the aperture shell to become larger. At the same time, the upper cover 1 can support the motor 4, which is conducive to making full use of the existing structure to set up other structures, making the overall structural setting more reasonable.

[0035] Reference Figure 2 as well as Figure 3In this embodiment, the ball 8 is a steel ball.

[0036] The provision of the steel balls makes the ball bearings 8 less susceptible to wear and makes the rotation of the moving ring 3 smoother.

[0037] Reference Figure 2 as well as Figure 3 In other embodiments, the ball 8 can also be a ceramic ball.

[0038] The arrangement of the ceramic balls makes the ball bearings 8 less prone to wear and tear, and makes the rotation of the moving ring 3 smoother.

[0039] Reference Figure 2 as well as Figure 3 In this embodiment, a spherical groove for mounting the ball 8 is recessed on the side of the dynamic ring 3 away from the upper cover 1 , and the opening diameter of the spherical groove is smaller than the diameter of the ball 8 .

[0040] By limiting the diameter of the spherical groove, the ball 8 can be firmly installed in the spherical groove. The ball 8 can rotate and roll freely in the spherical groove, thereby converting the original sliding friction of the actuator column into the rolling friction of the ball 8, making the ball 8 less prone to wear and making the rotation of the dynamic ring 3 smoother and more sensitive.

[0041] Reference Figure 2 as well as Figure 3 In this embodiment, the limiting member includes a limiting ring 11, which is fixedly connected to the side of the dynamic ring 3 close to the upper cover 1. The inner bottom wall of the upper cover 1 is recessed with a limiting groove 12 that is adapted to the limiting ring 11, and the limiting groove 12 is correspondingly set as an annular groove.

[0042] When the movable ring 3 rotates, the limiting ring 11 rotates synchronously in the limiting groove 12. The cooperation between the limiting ring 11 and the limiting groove 12 can limit the horizontal movement of the movable ring 3, so that the movable ring 3 can rotate steadily around the center of the light-transmitting hole 7.

[0043] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-loss automatic diaphragm, characterized by: The movable ring comprises an upper cover, a base, a moving ring, a motor and a blade group, wherein the upper cover is connected to the base to form an active space, the blade group and the moving ring are movably connected in the active space, the blade group is rotatably connected to the bottom wall of the base, the moving ring is arranged between the blade group and the upper cover, the upper cover and the base are penetrated by a connected light-transmitting hole, the moving ring can rotate around the center of the light-transmitting hole, and a limiting member for limiting the rotation of the moving ring away from the center of the light-transmitting hole is also provided in the active space, a plurality of balls are provided on the side of the moving ring away from the upper cover, the plurality of balls are evenly distributed around the center of the light-transmitting hole, and the moving ring is supported above the blade group by the balls; the motor and the moving ring are transmitted by gears.

2. The low-loss automatic diaphragm according to claim 1, characterized in that: The driving shaft of the motor is provided with an output gear, the outer circumference of the moving ring is integrally connected with an arc-shaped rack, the rack is arranged in contact with the outer circumference of the moving ring, and the output gear is meshed with the rack.

3. The low-loss automatic diaphragm according to claim 2, characterized in that: The motor is arranged on the upper cover, the driving shaft of the motor passes through the upper cover, and the output gear is arranged in the movable space.

4. The low-loss automatic diaphragm according to claim 1, characterized in that: The balls are steel balls.

5. The low-loss automatic diaphragm according to claim 1, characterized in that: The balls are ceramic balls.

6. The low-loss automatic diaphragm according to claim 1, characterized in that: A spherical groove for mounting a ball is recessed on one side of the moving ring away from the upper cover, and an opening diameter of the spherical groove is smaller than a diameter of the ball.

7. The low-loss automatic aperture according to claim 6, characterized in that: The limiting member includes a limiting ring, which is fixedly connected to the side of the dynamic ring close to the upper cover. The inner bottom wall of the upper cover is recessed with a limiting groove adapted to the limiting ring, and the limiting groove is correspondingly set as an annular groove.

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