Variable temperature control correction separation blade switching mechanism

Abstract

The invention discloses a variable temperature control correction separation blade switching mechanism which comprises a base fixedly installed on an optical system structure frame. The driving element mounting seat is arranged on the base; the driving unit is mounted on the driving element mounting seat; the switching arm is mounted on the driving unit through a mounting hole in the middle of the switching arm; the correction blocking piece is installed at the end of the switching arm and can rotate along with the switching arm. And the guide part is used for restraining the axial movement of the correction separation blade. According to the variable temperature control correction separation blade switching mechanism, the large-size and large-weight variable temperature control correction separation blade can be rapidly cut into and out of an optical system, and non-uniform correction is carried out on the infrared optical system. The variable temperature control correction separation blade improves correction precision and adaptability through temperature adjustment. The switching mechanism is small in overall dimension, has a quick switching function, can be self-locked in power failure, and has good vibration and impact resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of infrared detection technology, and in particular to a variable temperature control correction shutter switching mechanism. BACKGROUND

[0002] In an airborne environment, the infrared thermal imager is affected by its own and external factors, and the output response rates of each pixel of the detector are different under the same intensity of infrared radiation. The existence of this non-uniformity reduces the imaging quality of the infrared thermal imager and affects its imaging or measurement, so it is necessary to add a correction shutter to the infrared thermal imager to correct the system consistency. When the system needs to be corrected for consistency, the correction shutter quickly cuts into the light path, the infrared detector takes the shutter as a uniformity radiation source, and by comparing the response values at different temperatures, the correction parameters are updated. When the system consistency correction is completed, the correction shutter quickly cuts out of the light path, without affecting the imaging and measurement of the infrared thermal imager.

[0003] Currently, the correction shutter of the infrared thermal imager is generally single-point correction, and the shutter does not have temperature control function, which cannot solve the problem of linear interval deviation caused by temperature fluctuation. The correction shutter increases the closed-loop temperature control system, and the shutter temperature is accurately adjusted. When the variable temperature control correction shutter cuts into the light path, the infrared detector takes the shutter as a uniformity radiation source, and by comparing the response values at different temperatures, the correction parameters are updated. By adjusting the temperature, the correction accuracy and adaptability are improved, which can effectively improve the correction effect in high temperature or low temperature environment, but the addition of the temperature control system increases the size and weight of the correction shutter. In the airborne environment, the variable temperature control shutter switching mechanism needs to have the functions of quickly cutting into the light path and switching the light path, and needs to be effectively locked and have anti-vibration impact capability. The existing correction shutter switching structure is generally single-point correction, and the shutter does not have temperature control function. The variable temperature control correction shutter has large size and weight, and the switching mechanism is difficult to design.

[0004] Based on the above technical problems, the technical personnel in the field urgently need to develop a variable temperature control correction shutter switching mechanism which can realize a large stroke, quickly cut into and switch the light path, and be effectively locked and have anti-vibration impact capability in the state of cutting into and switching the light path. SUMMARY

[0005] The purpose of the present application is to provide a variable temperature control correction shutter switching mechanism which can realize a large stroke, quickly cut into and switch the light path, and be effectively locked and have anti-vibration impact capability in the state of cutting into and switching the light path.

[0006] In order to achieve the above purpose, the present application provides the following technical scheme: The variable temperature control correction shutter switching mechanism of the present application comprises: a base fixedly installed on a frame of an optical system structure; and a driving element mounting seat arranged on the base; a driving unit installed on the driving element mounting seat; a switching arm installed on the driving unit through a mounting hole in a middle portion of the switching arm; a correction shutter installed on an end portion of the switching arm and capable of rotating with the switching arm; The switching mechanism further comprises: a guide portion for restricting axial movement of the correction shutter; a sensing portion having a plurality of sensing ends for sensing a magnetic field of an electromagnet according to rotation of the correction shutter to a light path cutting-in position or a light path cutting-out position, respectively.

[0007] Further, the driving unit comprises a driving element; and a speed reducer installed on the driving element mounting seat, an output shaft of the driving element being connected to an input shaft of the speed reducer, and the switching arm being installed on the speed reducer through the mounting hole in the middle portion of the switching arm.

[0008] Preferably, the driving element is selected from a brushless motor, a brush motor or a stepping motor.

[0009] Further, the guide portion comprises a guide slider installed on the switching arm; and a guide groove installed on the base, when the output shaft of the speed reducer is driven to rotate by the driving element, the correction shutter rotates around the output shaft of the speed reducer, so that the guide slider contacts and slides in the guide groove, and rotates around the output shaft of the speed reducer to restrict axial movement of the correction shutter.

[0010] Further, the sensing portion comprises a first position sensor and a second position sensor installed on the base; When the correction shutter rotates to the light path cutting-out position, the first position sensor senses the magnetic field of the electromagnet, and when the correction shutter rotates to the light path cutting-in position, the second position sensor senses the magnetic field of the electromagnet.

[0011] Further, the switching arm is fixed by using a jackscrew and the output shaft of the speed reducer.

[0012] Further, a counterweight is installed on an end portion of the switching arm away from the correction shutter, for adjusting the overall center of mass of the switching arm to be located on the rotation axis.

[0013] In the above technical solution, the variable temperature control correction shutter switching mechanism has the following beneficial effects: The variable temperature control correction shutter switching mechanism can realize quick switching of large-size and large-weight variable temperature control correction shutters in an optical system, and corrects the infrared optical system, wherein the diameter of the correction shutter can be realized as Φ20mm~Φ100mm, the rotation angle range can be realized as 30°~180°, and the rotation angular velocity can be realized as 10° / s~180° / s. The variable temperature control correction shutter can improve the correction precision and adaptability through temperature regulation. The switching mechanism has small overall size, quick switching function, self-locking after power-off, and good anti-vibration and anti-impact capability. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0015] Fig. 1 A schematic diagram of the overall structure of a variable temperature control correction shutter switching mechanism provided by the embodiment of the present application is shown in the figure. Fig. 2 A schematic diagram of the correction shutter cutting-in light path state in the variable temperature control correction shutter switching mechanism provided by the embodiment of the present application is shown in the figure. Fig. 3 A schematic diagram of the correction shutter cutting-out light path state in the variable temperature control correction shutter switching mechanism provided by the embodiment of the present application is shown in the figure.

[0016] Explanation of reference signs: 1, base; 2, driving element mounting seat; 3, driving unit; 4, switching arm; 5, correction shutter; 6, guide part; 7, sensing part; 8, electromagnet; 9, jackscrew; 10, counterweight; 301, driving element; 302, speed reducer; 601, guide slider; 602, guide groove; 701, first position sensor; 702, second position sensor. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0018] Referring to Figs. 1-3 the figure shown; The variable temperature control correction shutter switching mechanism of the present application comprises: a base 1 fixedly installed on an optical system structure frame; and a driving element mounting seat 2 arranged on the base 1; a driving unit 3 installed on the driving element mounting seat 2; a switching arm 4 installed on the driving unit 3 through the mounting hole in the middle part thereof; a correction baffle 5 installed at the end of the switching arm 4 and capable of rotating with the switching arm 4; preferably, the correction baffle 5 is a variable temperature control correction baffle. The variable temperature control correction baffle of the present application can accurately adjust the temperature of the baffle through a closed-loop temperature control system, so that the temperature continuously changes within a specific temperature range and adapts to different environmental requirements. At the same time, the variable temperature control correction baffle of the present application can be equipped with a cooling control device (such as a liquid cooling system or a semiconductor refrigeration sheet) to ensure that the baffle is quickly cooled and kept stable. The variable temperature control correction baffle can be equipped with a heat dissipation control device (such as a heating sheet) to ensure that the baffle is quickly heated and kept stable. The variable temperature control correction baffle can be circular, rectangular or irregular in shape.

[0019] The switching mechanism further comprises: a guide part 6 for constraining the axial movement of the correction baffle 5; a sensing part 7 having a plurality of sensing ends for sensing the magnetic field of an electromagnet 8 according to the rotation of the correction baffle 5 to cut into or cut out the light path.

[0020] As a further introduction to the present embodiment, the driving unit 3 comprises a driving element 301; and a speed reducer 302 installed on the driving element mounting seat 2, the output shaft of the driving element 301 is connected with the input shaft of the speed reducer 302, and the switching arm 4 is installed on the speed reducer 302 through the mounting hole in the middle part thereof.

[0021] As a preferred technical solution of the present embodiment, the driving element 301 is selected from a brushless motor, a brushed motor or a stepping motor. When the driving element 301 drives the speed reducer 301 to rotate, the output shaft of the speed reducer 301 drives the switching arm 4 to rotate around the output shaft, and the correction baffle 5 cuts into or cuts out the circular area of the light path. The diameter of the circular area of the correction baffle can be Φ20mm~Φ100mm. In the present embodiment, the diameter of the circular area of the correction baffle is Φ60mm, which can be used for non-uniformity correction of an optical system with a light aperture of about Φ50mm.

[0022] Preferably, the speed reducer 302 can use a planetary gear speed reducer or a harmonic speed reducer. In the present embodiment, a harmonic speed reducer is selected, and the speed reduction ratio is 50:1. The harmonic speed reducer has a self-locking function. After the driving element 301 is powered off, the output shaft of the speed reducer 302 can remain in a locked state, and the correction baffle 5 is locked and immovable.

[0023] Specifically, the switching arm 4 can be installed on the output shaft of the speed reducer 302, or on the rotating shaft of a shaft system composed of a set of angular contact bearings, the other end of the rotating shaft being connected with the output shaft of the speed reducer 302.

[0024] As a further introduction of the embodiment, the guide part 6 comprises a guide slider 601 installed on the switching arm 4; and a guide groove 602 installed on the base 1, when the output shaft of the speed reducer 302 is driven to rotate by the driving element 301, the correction baffle 5 rotates around the output shaft of the speed reducer 302, so that the guide slider 7 contacts and slides inside the guide groove 6, rotates around the output shaft of the speed reducer 302 to constrain the axial movement of the correction baffle 5, and improves the anti-vibration impact capability of the correction baffle 5.

[0025] As a further introduction of the embodiment, the sensing part 7 comprises a first position sensor 701 and a second position sensor 702 installed on the base 1. The default position of the correction baffle 5 is the state of cutting out the light path, as shown in FIG. 2. Fig. 2 When the control system inputs a correction instruction to the baffle switching mechanism, the driving element 301 drives the correction baffle 5 to rotate to the state of cutting into the light path, the rotation angle range can be 30°~180°, the rotation angle of the embodiment is 60°, the rotation speed can be 10° / s~180° / s, the rotation angular velocity of the embodiment is 50° / s, as shown in FIG. 3, at this time the first position sensor 701 can measure the magnetic field of the electromagnet 8, the control system powers off the driving element 301, the correction baffle 5 remains in the locked state, and the optical system performs uniformity correction. Fig. 3 When the optical system completes the uniformity correction, the control system inputs a cutting-out light path instruction to the baffle switching mechanism, the driving element 301 drives the correction baffle 5 to reversely rotate to the state of cutting out the light path, the rotation angle range can be 30°~180°, the rotation angle of the embodiment is 60°, the rotation speed can be 10° / s~180° / s, the rotation angular velocity of the embodiment is 50° / s, as shown in FIG. 4, when the correction baffle 5 completely cuts out the light path, the second position sensor 702 can measure the magnetic field of the electromagnet 8, the control system powers off the driving element 301, and the correction baffle 5 remains in the locked state. Fig. 2

[0026] When the optical system performs uniformity correction again, the above steps are repeated.

[0027] As a further introduction of the embodiment, the switching arm 4 is fixed by using a jackscrew 9 and the output shaft of the speed reducer 302.

[0028] ​As a further introduction of the present embodiment, the switching arm 4 is provided with a counterweight 10 at the end away from the correction baffle 5, for adjusting the overall center of mass of the switching arm 4 to be located on the rotating shaft. The unbalanced moment of the correction baffle 5 around the output shaft of the speed reducer 302 is eliminated, so that the correction baffle 5 has good anti-vibration impact capability.

[0029] In particular, the position sensor can be a non-contact sensor, or a contact type electric switch.

[0030] In particular, the tail of the driving element 301 can be provided with an encoder for control of the rotating speed.

[0031] The above only describes certain exemplary embodiments of the present application by way of illustration, and it is needless to say that the described embodiments can be modified in various ways without departing from the spirit and scope of the present application for those skilled in the art. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. A variable temperature control correction baffle switching mechanism, characterized in that, The switching mechanism includes: The base (1) is fixedly mounted on the optical system structural frame; and Drive element mounting base (2) is provided on the base (1); A drive unit (3) is mounted on the drive element mounting base (2); The switching arm (4) is mounted on the drive unit (3) through the mounting hole in its middle part; A correction baffle (5) is installed at the end of the switching arm (4) and can rotate with the switching arm (4); The switching mechanism also includes: The guide (6) is used to constrain the axial movement of the correction baffle (5); The sensing part (7) has multiple sensing ends, which respectively rotate to enter the optical path or exit the optical path according to the correction baffle (5) to sense the magnetic field of the electromagnet (8).

2. The variable temperature control correction baffle switching mechanism according to claim 1, characterized in that, The driving unit (3) includes a driving element (301); and A speed reducer (302) is mounted on the drive element mounting base (2). The output shaft of the drive element (301) is connected to the input shaft of the speed reducer (302). The switching arm (4) is mounted on the speed reducer (302) through the mounting hole in its middle.

3. The variable temperature control correction baffle switching mechanism according to claim 2, characterized in that, The drive element (301) is selected from brushless motors, brushed motors or stepper motors.

4. The variable temperature control correction baffle switching mechanism according to claim 2, characterized in that, The guide (6) includes a guide slider (601) mounted on the switching arm (4); and The guide groove (602) installed on the base (1) allows the correction baffle (5) to rotate around the output shaft of the reducer (302) when the drive element (301) drives the output shaft of the reducer (302) to rotate, so that the guide slider (7) contacts and slides inside the guide groove (6) and rotates around the output shaft of the reducer (302) to constrain the axial movement of the correction baffle (5).

5. The variable temperature control correction baffle switching mechanism according to claim 1, characterized in that, The sensing unit (7) includes a first position sensor (701) and a second position sensor (702) mounted on the base (1). When the correction baffle (5) rotates to the position of cutting out the optical path, the first position sensor (701) senses the magnetic field of the electromagnet (8). When the correction baffle (5) rotates to the position of cutting into the optical path, the second position sensor (702) senses the magnetic field of the electromagnet (8).

6. The variable temperature control correction baffle switching mechanism according to claim 1, characterized in that, The switching arm (4) is fixed using a set screw (9) and the output shaft of the reducer (302).

7. The variable temperature control correction baffle switching mechanism according to claim 1, characterized in that, A counterweight (10) is installed at the end of the switching arm (4) away from the correction baffle (5) to adjust the overall center of mass of the switching arm (4) to be located on the rotation axis.

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