CN217689565U

CN217689565U - Large-aperture electric diaphragm mechanism

Info

Publication number: CN217689565U
Application number: CN202221457685.9U
Authority: CN
Inventors: 朱秀雪
Original assignee: Sofn Instruments Co ltd
Current assignee: Sofn Instruments Co ltd
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2022-10-28
Anticipated expiration: 2032-06-10

Abstract

The application relates to the diaphragm field, especially, relate to an electronic diaphragm mechanism of large aperture, its technical scheme main points are: the large-aperture electric diaphragm mechanism comprises a diaphragm plate and a diaphragm, diaphragm holes are formed in the diaphragm plate, the large-aperture electric diaphragm mechanism further comprises a driving assembly used for driving the diaphragm to move horizontally, the driving assembly comprises a driving piece used for providing power, and the driving piece is configured to stop running after the moving distance of the diaphragm reaches a preset distance; the purpose of improving the movement precision of the diaphragm plate so as to improve the action precision of the whole diaphragm is achieved.

Description

Large-aperture electric diaphragm mechanism

Technical Field

The application relates to the field of diaphragms, in particular to a large-aperture electric diaphragm mechanism.

Background

The diaphragm is an entity which plays a role in limiting the light beam in the optical system, and can adjust the intensity of the light beam or the imaging area through adjusting the light-passing area.

The diaphragm described in the related art comprises a diaphragm plate and a diaphragm sheet which are parallel to each other, wherein a circular diaphragm hole for light beams to pass through is formed in the diaphragm plate, and a semicircular light groove with the same diameter as the diaphragm hole is formed in one side of the diaphragm sheet; the position relation between the light groove and the diaphragm hole is adjusted by manually moving the diaphragm plate, and when the light groove is concentric with the diaphragm hole, the diaphragm can provide the maximum light passing area for the light beam, namely the area of the diaphragm hole; when the circle center of the light groove crosses the circle center of the diaphragm hole, the diaphragm sheet partially shields the diaphragm hole, and then the effective light passing area of the diaphragm hole is gradually reduced.

The manual movement of the diaphragm plate not only results in poor precision of the positional relationship between the diaphragm holes and the diaphragm plate, but also cannot be implemented in some special cases such as limitation of high-power laser beams or use of the diaphragm in a vacuum environment due to consideration of safety factors and feasibility of tests.

SUMMERY OF THE UTILITY MODEL

In order to improve the action precision of the removal precision of diaphragm piece in order to improve whole diaphragm, this application provides an electronic diaphragm mechanism of large aperture.

The application provides a large aperture electric diaphragm mechanism adopts following technical scheme:

the utility model provides an electronic diaphragm mechanism of large aperture, includes diaphragm board and diaphragm piece, has seted up the diaphragm hole on the diaphragm board, still including the drive assembly who is used for driving diaphragm piece horizontal migration, drive assembly is including the driving piece that is used for providing power, and the driving piece is configured as the driving piece stall after the actual migration distance of diaphragm piece reaches predetermineeing the migration distance.

By adopting the technical scheme, when the diaphragm is required to be driven to move, the driving piece is started to enable the driving component to operate and drive the diaphragm to translate, when the actual moving distance of the diaphragm reaches the preset moving distance, the driving piece stops operating, and the diaphragm further stops moving; compared with the manual movement of the diaphragm plate, the diaphragm plate has higher control precision, namely the precision of the effective light-passing area of the diaphragm hole is higher, so that the action precision of the whole diaphragm is improved.

Optionally, the device further comprises a support frame, the driving assembly comprises a screw rod rotationally connected with the support frame, a nut capable of axially translating along the screw rod is arranged on the screw rod, and the nut is used for driving the diaphragm to move; the driving piece adopts a stepping motor for driving the screw rod to rotate.

By adopting the technical scheme, the stepping motor matched controller can realize accurate movement of the nut, and the movement precision of the nut directly acts on the movement precision of the diaphragm.

Optionally, the device further comprises a support frame, the driving assembly comprises a driving wheel and a driven wheel which are rotatably connected with the support frame, a conveying belt is arranged between the driving wheel and the driven wheel, and the conveying belt is used for driving the diaphragm to move; the driving piece adopts a stepping motor for driving the driving wheel to rotate.

By adopting the technical scheme, the step motor is matched with the controller, so that the accurate stepping of the conveyor belt can be realized, and the stepping precision of the conveyor belt directly acts on the moving precision of the diaphragm.

Optionally, the driving part adopts a linear motor, and the diaphragm is fixed on a sliding block of the linear motor.

By adopting the technical scheme, the linear motor has extremely high moving precision, and is favorable for improving the moving precision of the diaphragm.

Optionally, a hand wheel is coaxially and fixedly connected to an output shaft of the stepping motor.

Through adopting above-mentioned technical scheme, not very high or the service scene of power supply of being inconvenient to the diaphragm precision requirement, the translation of diaphragm piece is realized to the mode of accessible rotation hand wheel.

Optionally, a guide extending along the translation direction of the diaphragm is fixed on the support frame, a diaphragm fixing frame is arranged on the guide, and the diaphragm is fixed on the diaphragm fixing frame.

By adopting the technical scheme, the moving of the diaphragm plate is guided, and the swing amplitude of the diaphragm plate in the moving process is reduced.

Optionally, the guide part adopts a slide rail, and the diaphragm fixing frame is connected to the slide rail in a sliding manner.

Optionally, the optical disc further comprises two position detection pieces, the two position detection pieces are distributed along the translation direction of the optical disc, a trigger piece for triggering the position detection piece is fixed on the optical disc fixing frame, the driving piece is coupled with a controller, and the controller is coupled with the position detection piece; the diaphragm can move within the range limited by the two position detection pieces, so that the diaphragm hole is completely shielded or completely exposed.

By adopting the technical scheme, the limitation of the limit moving distance of the diaphragm in two directions is realized.

Optionally, the two position detecting elements are a first microswitch and a second microswitch respectively, and the trigger element is one of a push pin, a button or a roller.

In summary, the present application has the following technical effects:

1. compared with the manual movement of the diaphragm plate, the control precision is higher by arranging the diaphragm plate, the diaphragm sheet and the driving assembly comprising the driving part, namely the precision of the effective light-passing area of the diaphragm hole is higher, so that the action precision of the whole diaphragm is improved;

2. the guide piece and the diaphragm fixing frame are arranged, so that the movement of the diaphragm is guided, and the swing amplitude of the diaphragm in the moving process is reduced;

3. the limiting of the limit moving distance of the diaphragm in two directions is realized by arranging the position detection piece, the controller and the trigger piece.

Drawings

FIG. 1 is a schematic perspective view of a large aperture electric diaphragm mechanism according to a first embodiment;

fig. 2 is a schematic perspective view of a large aperture electric aperture stop mechanism according to a second embodiment.

In the figure, 1, a support frame; 2. a diaphragm plate; 3. a diaphragm aperture; 4. a diaphragm; 5. a light groove; 6. a drive assembly; 61. a screw; 62. a nut; 63. a stepping motor; 64. a driving wheel; 65. a driven wheel; 66. a conveyor belt; 67. a hand wheel; 71. a slide rail; 72. an optical axis; 8. a diaphragm fixing frame; 9. a trigger; 10. a first microswitch; 11. a second microswitch; 12. a first proximity switch; 13. a second proximity switch.

Detailed Description

In the description of the present application, it should be noted that the terms "horizontal", "vertical", and the like are relative relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the process or module referred to must have a particular orientation, state, and operation, and thus, should not be construed as limiting the present invention.

The present application is described in further detail below with reference to the attached drawings.

The first embodiment is as follows:

referring to fig. 1, the application provides a large-aperture electric diaphragm mechanism, which comprises a support frame 1, a diaphragm plate 2 fixed on the support frame 1, a diaphragm 4 arranged on one side of the diaphragm plate 2 and parallel to the diaphragm plate 2, and a driving component 6 for driving the diaphragm 4 to move along the horizontal direction, wherein a circular diaphragm hole 3 with a horizontal axis is arranged on the diaphragm plate 2, and a semicircular light slot 5 with the same diameter as the diaphragm hole 3 is arranged on one side of the diaphragm 4; before driving the diaphragm 4 to move, setting a preset moving distance of the diaphragm 4 in advance, wherein the preset moving distance is configured to enable the shielding area of the diaphragm 4 to the diaphragm hole 3 or the effective light-passing area required by the diaphragm hole 3 to meet the required requirement after the actual moving distance of the diaphragm 4 is equal to the preset moving distance; the driving assembly 6 includes a driving member for providing power, and the driving member is configured to stop operating when the actual moving distance of the diaphragm 4 reaches the preset moving distance.

In this embodiment, the driving assembly 6 includes a screw 61 rotatably connected to the supporting frame 1, the screw 61 is horizontally disposed and can be fixed to rotate around its axis, the driving member adopts a stepping motor 63 whose body is fixed on the supporting frame 1, the stepping motor 63 is configured with a controller (not shown in the figure), and an output shaft of the stepping motor 63 is coaxially and fixedly connected with the screw 61 through a transmission shaft and a coupling; the screw 61 is connected with a nut 62 capable of reciprocating in the horizontal direction in a threaded manner, the nut 62 is fixed with a vertically arranged diaphragm fixing frame 8, the diaphragm 4 is fixed on the diaphragm fixing frame 8, and the diaphragm fixing frame 8 can be omitted and the diaphragm 4 can be directly fixed on the nut 62.

When the diaphragm 4 needs to be driven to move horizontally, the stepping motor 63 is started, the stepping motor 63 realizes accurate stepping under the action of the controller, the stepping motor 63 drives the screw 61 to rotate, and the nut 62 further drives the diaphragm 4 to move horizontally; compared with the method for manually driving the diaphragm plate 4 to move, the stepping motor 63 with higher control precision can greatly improve the moving precision of the diaphragm plate 4, and is further beneficial to improving the precision of the effective light transmission area of the diaphragm hole 3, namely the action precision of the whole diaphragm; in addition, the diaphragm mechanism can be suitable for a strong light environment, a high-low temperature environment and a vacuum environment in an electric control mode, and the application range of the diaphragm mechanism is expanded.

Further, the stepping motor 63 is a stepping motor with double output shafts, the screw 61 is fixed on an output shaft at one end of the stepping motor 63, and a hand wheel 67 is coaxially and fixedly connected on an output shaft at the other end of the stepping motor 63, so that the diaphragm mechanism is convenient to apply under the condition that the control precision requirement is not high or power cannot be supplied.

In order to improve the stability of the diaphragm 4 in the moving process, a guide piece positioned below the screw 61 is fixed on the support frame 1, the guide piece extends along the horizontal direction, and the diaphragm fixing frame 8 extends downwards to the guide piece and is in sliding connection with the guide piece; the guide in this embodiment is a slide rail 71.

Two position detection pieces coupled with the controller are arranged below the sliding rail 71, a trigger piece 9 capable of triggering the position detection pieces is fixed on the diaphragm fixing frame 8, and the two position detection pieces are distributed at intervals along the horizontal direction; in this embodiment, the two position detecting elements are a first microswitch 10 and a second microswitch 11 fixed on the support frame 1, the first microswitch 10 is far away from the diaphragm aperture 3 than the second microswitch 11, and the trigger element 9 is one of a press pin, a button or a roller.

Taking a press pin as an example, in the process that the diaphragm 4 moves towards the direction close to the first microswitch 10, when the optical slot 5 is coaxial with the diaphragm hole 3, that is, the diaphragm hole 3 is completely exposed and reaches the maximum light-passing area, the press pin will touch the action reed of the first microswitch 10, the first microswitch 10 is triggered, and the controller controls the stepping motor 63 to stop rotating; similarly, in the process that the diaphragm 4 moves towards the direction close to the second microswitch 11, when the diaphragm 4 completely shields the diaphragm hole 3, the action reed of the second microswitch 11 is triggered by the pin, the second microswitch 11 is triggered, and the controller controls the stepping motor 63 to stop rotating; thus, the movable distance of the diaphragm 4 is limited within the range limited by the two micro switches.

The second embodiment:

the present embodiment differs from the first embodiment in that the drive assembly 6, the guide member, the position detecting member, and the trigger member 9 are different.

Referring to fig. 2, specifically, the driving assembly 6 in this embodiment includes a driving wheel 64 and a driven wheel 65 rotatably connected to the support frame 1, a conveying belt 66 extending in the horizontal direction is disposed between the driving wheel 64 and the driven wheel 65, and the diaphragm fixing frame 8 is fixed on the conveying belt 66; of course, the conveyor belt 66 can be replaced by a chain, and the driving wheel 64 and the driven wheel 65 can be adjusted in terms of the adaptability of the chain; the driving member also adopts a stepping motor 63, an output shaft of the stepping motor 63 is coaxially and fixedly connected with the driving wheel 64, or a transmission mechanism is adopted to realize the transmission of the torque between the stepping motor 63 and the driving wheel 64. In another embodiment, the driving member is a linear motor, and the diaphragm 4 can be directly fixed on a slide block of the linear motor or indirectly fixed on the slide block through a diaphragm fixing frame 8.

The guide part adopts an optical axis 72 horizontally fixed on the support frame 1, and the diaphragm fixing frame 8 extends downwards to the optical axis 72 and is connected on the optical axis 72 in a sliding way.

The two position detection parts in the embodiment are respectively a first proximity switch 12 and a second proximity switch 13, the first micro proximity switch is far away from the diaphragm hole 3 compared with the second proximity switch 13, and the trigger part 9 adopts a magnetic or iron trigger; in another embodiment, the position detecting element is a travel switch, and the triggering element 9 may be the diaphragm holder 8, and the travel switch may be triggered when the diaphragm holder 8 touches and presses the travel switch.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. The utility model provides an electronic diaphragm mechanism of large aperture, includes diaphragm plate (2) and diaphragm piece (4), has seted up diaphragm hole (3) on diaphragm plate (2), its characterized in that: the device comprises a driving assembly (6) for driving the diaphragm (4) to move horizontally, wherein the driving assembly (6) comprises a driving piece for providing power, and the driving piece is configured to stop running after the actual moving distance of the diaphragm (4) reaches a preset moving distance.

2. The large aperture electric diaphragm mechanism of claim 1, characterized in that: the diaphragm plate driving mechanism is characterized by further comprising a support frame (1), the driving assembly (6) comprises a screw rod (61) which is rotatably connected with the support frame (1), a nut (62) capable of axially translating along the screw rod (61) is arranged on the screw rod (61), and the nut (62) is used for driving the diaphragm plate (4) to move; the driving piece adopts a stepping motor (63) for driving the screw rod (61) to rotate.

3. The large-aperture electric diaphragm mechanism according to claim 1, characterized in that: also comprises a supporting frame (1), a driving component (6) comprises a driving wheel (64) and a driven wheel (65) which are rotationally connected with the supporting frame (1), a conveyor belt (66) is arranged between the driving wheel (64) and the driven wheel (65), and the conveyor belt (66) is used for driving the diaphragm plate (4) to move; the driving piece adopts a stepping motor (63) for driving a driving wheel (64) to rotate.

4. The large aperture electric diaphragm mechanism of claim 1, characterized in that: the driving piece adopts a linear motor, and the diaphragm (4) is fixed on a slide block of the linear motor.

5. A large aperture electric diaphragm mechanism according to claim 2 or 3, characterized in that: a hand wheel (67) is coaxially and fixedly connected to an output shaft of the stepping motor (63).

6. An electric large-aperture diaphragm mechanism according to any one of claims 2 to 4, characterized in that: a guide piece extending along the translation direction of the diaphragm (4) is fixed on the support frame (1), a diaphragm fixing frame (8) is arranged on the guide piece, and the diaphragm (4) is fixed on the diaphragm fixing frame (8).

7. The large-aperture electric diaphragm mechanism according to claim 6, characterized in that: the guide piece adopts a slide rail (71), and the diaphragm fixing frame (8) is connected on the slide rail (71) in a sliding manner.

8. The large-aperture electric diaphragm mechanism according to claim 6, characterized in that: the device also comprises two position detection pieces, the two position detection pieces are distributed along the translation direction of the diaphragm (4), a trigger piece (9) for triggering the position detection pieces is fixed on the diaphragm fixing frame (8), the driving piece is coupled with a controller, and the controller is coupled with the position detection pieces; the diaphragm (4) can move in the limited range of the two position detection pieces, so that the diaphragm hole (3) can be completely shielded or completely exposed.

9. The large-aperture electric diaphragm mechanism according to claim 8, characterized in that: the two position detection pieces are respectively a first microswitch (10) and a second microswitch (11), and the trigger piece (9) is one of a press pin, a button or a roller.