An optical system alignment device

Abstract

The present application relates to the field of aerospace technology, and more particularly to an optical system axis alignment device, comprising a base, a torsion spring, a prism, a mounting frame and a self-unlocking limiting part. The base is arranged between a transmitting optical system and a receiving optical system of an optical system to be aligned, and is fixed relative to the transmitting optical system and the receiving optical system. In the state of alignment, the torsion spring provides a rotating force to the prism, the self-unlocking limiting part limits the rotation of the prism, the prism respectively blocks a part of the light path of the transmitting optical system and the receiving optical system to be aligned, collects the outgoing light of the transmitting optical system, and transmits it to the receiving optical system, thereby achieving alignment. When it is necessary to release the alignment state, the self-unlocking limiting part releases the limitation on the prism, the mounting frame drives the prism to rotate under the action of the torsion spring, the light path of the transmitting optical system and the receiving optical system is no longer blocked, the torsion spring returns to the natural state, and provides a limiting function for the prism.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aerospace technology, and particularly relates to an optical system axis alignment device. BACKGROUND

[0002] In the field of aerospace, such as a rocket, an optical measurement or monitoring system is carried on the upper surface. Since the rocket will vibrate and impact during flight, ignition, and separation, etc., a vibration damper needs to be installed to protect the optical system. In order to master the change of the optical axis of the optical system after the impact, and to provide support for subsequent measurement and monitoring, a front-end axis alignment device needs to be installed on the optical system. The device has a prism that blocks part of the optical path of the optical system, and the change of the optical path is monitored to understand the change of the shafting after the impact. Before the optical system starts to work formally, the prism needs to be turned out of the optical path of the optical system, and does not affect the work of the optical system. In the past, the prism rotation of the axis alignment device was often realized by a micro servo motor and an electrical switch. This method needs to increase the circuit control, and the prism needs to be fixed after being in place, which needs a fixing device, and is relatively troublesome to realize. Therefore, it is urgent to design a simple and reliable optical system axis alignment device. SUMMARY

[0003] The purpose of the present application is to provide a simple and reliable optical system axis alignment device.

[0004] In order to achieve the above purpose, the present application provides an optical system axis alignment device, comprising:

[0005] A base is arranged between a transmitting optical system and a receiving optical system to be aligned, and is fixed relative to the transmitting optical system and the receiving optical system;

[0006] A torsional spring has first and second torsional arms at opposite ends. In a natural state, the orthographic projections of the first and second torsional arms are on the same straight line and are in opposite directions.

[0007] A prism has two opposite reflecting surfaces that are 45° inclined and perpendicular to each other. The prism is rotatably mounted on the base through a mounting frame. In the axis alignment state, the prism blocks part of the optical path of the transmitting optical system and the receiving optical system, respectively, collects the outgoing light of the transmitting optical system, and transmits it to the receiving optical system. The first torsional arm is fixed to the base, and the second torsional arm is attached to the mounting frame. The first torsional arm and the second torsional arm are arranged at an angle to provide a rotating force for the prism.

[0008] The self-unlocking limiting part is used for limiting the rotation of the mounting frame relative to the base, so that the prism is kept in the axis state, when the axis state needs to be released, the self-unlocking limiting part releases the limitation on the prism, under the action of the torsion spring, the mounting frame drives the prism to rotate, the light path of the emitting optical system and the receiving optical system is no longer blocked, the torsion spring returns to the natural state, and the first torsion arm and the second torsion arm are both abutted on the mounting frame.

[0009] Optionally, the self-unlocking limiting part is a memory alloy puller, which is arranged at the lower end of the base, and the prism is located at the upper end of the base.

[0010] The mounting frame has a limiting section parallel to the upper end surface of the base and a rotating column section inserted into the base, the limiting section is connected with the rotating column section, the base is provided with a through hole penetrating through the base along the up-down direction of the base, the limiting section is provided with a limiting hole coaxially arranged with the through hole, the pin column of the memory alloy puller is inserted into the limiting hole after penetrating through the through hole, and the pin column is pulled out of the limiting hole after being powered.

[0011] Optionally, the limiting section comprises a bottom plate and two side plates, the two side plates are arranged at intervals and have one end connected with the bottom plate, the prism is accommodated between the two side plates, and the limiting hole is arranged on the bottom plate.

[0012] Optionally, the first torsion arm and the second torsion arm are arranged at 90° in the axis state.

[0013] Optionally, the base is provided with a fixing hole, the end portion of the first torsion arm is provided with a first bending section, and the first bending section is inserted into the fixing hole.

[0014] Optionally, the end portion of the second torsion arm is provided with a second bending section, so as to increase the contact area with the mounting frame.

[0015] Optionally, the torsion spring is a cylindrical helical torsion spring.

[0016] The above technical scheme of the present application has the following advantages:

[0017] The optical system axis alignment device provided by the application comprises a base, a torsion spring, a prism, a mounting frame and a self-unlocking limiting part. The base is arranged between a transmitting optical system and a receiving optical system of an optical system to be aligned and is fixed relative to the transmitting optical system and the receiving optical system. The two ends of the torsion spring are a first torsion arm and a second torsion arm. In a natural state, the projections of the first torsion arm and the second torsion arm are on the same straight line and are in opposite directions. The two opposite reflecting surfaces of the prism are both 45° inclined and perpendicular to each other. The prism is rotatably arranged on the base through the mounting frame. In an alignment state, the prism blocks part of the light paths of the transmitting optical system and the receiving optical system, collects the outgoing light of the transmitting optical system, and the two reflecting surfaces of the prism are perpendicular to each other. The collected outgoing light is parallel to the direction of the outgoing light after being reflected by the two reflecting surfaces, and the light beam is returned to the receiving optical system, thereby realizing the alignment of the optical axes of the transmitting optical system and the receiving optical system. The first torsion arm is fixed to the base, the second torsion arm is attached to the mounting frame, the first torsion arm and the second torsion arm are arranged at an angle, and the stored energy provides a rotating force for the prism. The self-unlocking limiting part limits the rotation of the mounting frame relative to the base, so that the prism remains in the alignment state. When the alignment state needs to be released, the self-unlocking limiting part releases the limitation on the prism, and under the action of the torsion spring, the mounting frame drives the prism to rotate, so that the light paths of the transmitting optical system and the receiving optical system are no longer blocked. The torsion spring returns to the natural state, and the first torsion arm and the second torsion arm are both attached to the mounting frame to provide a limiting for the prism, thereby avoiding the rotation of the prism. BRIEF DESCRIPTION OF DRAWINGS

[0018] The proportions and quantities of the components in the drawings provided for the purpose of illustration only may not be consistent with the actual product.

[0019] Figure 1 is a top view of an optical system axis alignment device in an embodiment of the application;

[0020] Figure 2 is Figure 1 is a sectional view of A-A in

[0021] Figure 3 is a state diagram of the optical system axis alignment device when the optical system is working;

[0022] Figure 4 is Figure 3 is a structural diagram of the optical system axis alignment device at another angle in

[0023] Figure 5 is a structural diagram of the optical system axis alignment device installed in an optical system and in an alignment state in an embodiment of the application;

[0024] Figure 6 is Figure 5 is a diagram of the optical system axis alignment device installed in an optical system and in a working state in

[0025] In the drawings:

[0026] 1: base;

[0027] 2: torsion spring;

[0028] 21: first torsion arm;

[0029] 22: second torsion arm;

[0030] 3: prism;

[0031] 4: mounting frame;

[0032] 41: rotating column segment;

[0033] 42: limiting segment;

[0034] 421: bottom plate;

[0035] 422: side plate;

[0036] 5: memory alloy puller;

[0037] 51: pin column;

[0038] 100: transmitting optical system;

[0039] 200: receiving optical system. DETAILED DESCRIPTION

[0040] To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0041] As Figure 1 and Figure 2 , Figure 5 and Figure 6As shown in the drawings, the optical system axis alignment device provided by the embodiment of the application comprises a base 1, a torsion spring 2, a prism 3, a mounting frame 4 and a self-unlocking limiting part. The base 1 is arranged between a transmitting optical system 100 and a receiving optical system 200 to be aligned and is fixed relative to the transmitting optical system 100 and the receiving optical system 200 to be aligned. The two torsion arms of the torsion spring 2 are a first torsion arm 21 and a second torsion arm 22. In a natural state, the orthographic projections of the first torsion arm 21 and the second torsion arm 22 are on the same straight line and are in opposite directions. The two opposite reflecting surfaces of the prism are 45° inclined and perpendicular to each other. The prism 3 is rotatably arranged on the base 1 through the mounting frame 4. In an alignment state, the prism 3 blocks a part of the light paths of the transmitting optical system 100 and the receiving optical system 200 to be aligned respectively and collects the outgoing light of the transmitting optical system 100. The first torsion arm 21 is fixed to the base 1 and the second torsion arm 22 is attached to the mounting frame 4. The first torsion arm 21 and the second torsion arm 22 are arranged at an angle and store energy to provide a rotating force for the prism 3. The self-unlocking limiting part is used to limit the rotation of the mounting frame 4 relative to the base 1, i.e. when the torsion spring 2 applies a rotating force to the prism 3, the self-unlocking limiting part limits the rotation of the prism 3, so that the prism remains in the alignment state. Since the prism 3 blocks a part of the light paths of the two transmitting optical systems 100 and the receiving optical systems 200 to be aligned respectively and is used to collect the outgoing light of the transmitting optical system 100, the two reflecting surfaces of the prism 3 are perpendicular to each other. The collected outgoing light is parallel to the direction of the outgoing light after being reflected by the two reflecting surfaces, so that the light beam is returned to the receiving optical system 200. The control part of the transmitting optical system 100 and the receiving optical system 200 judges the coaxiality according to the received light beam. If necessary, the transmitting optical system 100 and the receiving optical system 200 are adjusted and compensated to realize the alignment of the optical axes of the transmitting optical system 100 and the receiving optical system 200. It should be noted that the control part of the transmitting optical system 100 and the receiving optical system 200 is a prior art structure and the compensation and adjustment of the optical system are also prior art, which will not be described here.

[0042] As shown in the drawings, Figure 3 and Figure 4 When it is necessary to release the alignment state, the self-unlocking limiting part releases the limitation on the prism 3. Under the action of the torsion spring 2, the mounting frame 4 drives the prism 3 to rotate and no longer blocks the light paths of the two transmitting optical systems 100 and the receiving optical systems 200 to be aligned. The torsion spring 2 returns to the natural state. The first torsion arm 21 and the second torsion arm 22 are both attached to the mounting frame 4 to limit the prism 3 and prevent the prism 3 from rotating. The transmitting optical system 100 and the receiving optical system 200 can start to work normally.

[0043] As shown in the drawings, Figure 5 and Figure 6As shown, in the optical system in the embodiment, the transmitting optical system 100 and the receiving optical system 200 are two lens structures, and the base 1 is fixedly connected to the outside of at least one of the lenses. Preferably, one side of the base 1 has an arc matching the lens to achieve better matching and fixing with the lens. In the rocket operation, the prism 3 is always in the axis alignment state. If the optical path is de-aligned due to vibration or other reasons, the optical system can automatically adjust. When the optical system needs to work, the self-unlocking limiting part releases the limitation on the prism 3, so that the prism 3 rotates and no longer blocks the light path, that is, it will not affect the normal work of the optical system.

[0044] In the embodiment, the self-unlocking limiting part only needs to be able to achieve convenient unlocking. For example, a fusible fuse that can be melted by power supply or an electric telescopic rod structure. Preferably, the self-unlocking limiting part is a memory alloy puller 5 with a telescopic pin 51 that can be retracted when powered on to release the limitation on the prism 3.

[0045] In the embodiment, the torsional spring 2 is a cylindrical helical torsional spring.

[0046] Referring to Figures 2-4 As shown, the mounting frame 4 has a limiting section 42 parallel to the upper end surface of the base 1 and a rotating column section 41 inserted into the base 1. The limiting section 42 is connected with the rotating column section 41. The base 1 is provided with a through hole penetrating the base 1 in the up-down direction of the base 1. The limiting section 42 is provided with a limiting hole coaxially arranged with the through hole. The pin 51 of the memory alloy puller 5 is inserted into the limiting hole after passing through the through hole. The pin 51 is pulled out of the limiting hole after being powered on. It should be noted that the rotating connection between the rotating column section 41 and the base 1 can adopt an existing structure, for example, direct rotating connection through hole and column size matching, or rotating connection through the arrangement of a bearing, which is not limited here.

[0047] Referring to Figure 3 and Figure 4 As shown, the limiting section 42 includes a bottom plate 421 and two side plates 422. The two side plates 422 are arranged at intervals and have one end connected with the bottom plate 421 to form a U-shaped structure. The two side plates 422 are used to accommodate the prism 3, and the limiting hole is arranged on the bottom plate 421.

[0048] In an example, in the axis alignment state, the first torsional arm 21 and the second torsional arm 22 are arranged at 90°. After the self-unlocking limiting part releases the limitation on the prism 3, the prism 3 rotates by 90°, and the first torsional arm 21 and the second torsional arm 22 are both abutted on the mounting frame 4 to provide limiting for the prism 3, avoiding rotation of the prism 3.

[0049] In an example, the base 1 is provided with a fixing hole, and the end of the first torsional arm 21 is provided with a first bending section. The first bending section is inserted into the fixing hole to achieve fixed connection of the torsional spring 2 with the base 1.

[0050] In an example, the end of the second torsion arm 22 is provided with a second bending section for increasing the contact area with the mounting frame 4.

[0051] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same; although the present application has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that not every example contains only one independent technical solution, and in the absence of solution conflicts, various technical features mentioned in each example can be combined in any way to form other embodiments that can be understood by those skilled in the art.

[0052] In addition, without departing from the scope of the present application, modifications are made to the technical solutions described in the foregoing examples, or equivalent replacements are made to part of the technical features, without causing the essence of the corresponding technical solution to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An aligning device for an optical system, characterized in that The application relates to an optical system axis alignment device. The device comprises a base arranged between a transmitting optical system and a receiving optical system of an optical system to be aligned, and fixed relative to the transmitting optical system and the receiving optical system; a torsion spring with two torsion arms, i.e. a first torsion arm and a second torsion arm, the projections of the first torsion arm and the second torsion arm on a plane are on the same line and in opposite directions in a natural state; a prism with two opposite reflecting surfaces, each of which is inclined at 45 degrees and perpendicular to each other, the prism is rotatably arranged on the base through a mounting frame, in an axis alignment state, the prism blocks part of the light paths of the transmitting optical system and the receiving optical system, collects the outgoing light of the transmitting optical system and transmits the light to the receiving optical system, the first torsion arm is fixed to the base, the second torsion arm is attached to the mounting frame, the first torsion arm and the second torsion arm are arranged at an angle to provide a rotating force for the prism; a self-unlocking limiting part is arranged to limit the rotation of the mounting frame relative to the base, so that the prism remains in the axis alignment state, when the axis alignment state needs to be released, the self-unlocking limiting part releases the limitation on the prism, under the action of the torsion spring, the mounting frame drives the prism to rotate, and the prism no longer blocks the light paths of the transmitting optical system and the receiving optical system, the torsion spring returns to the natural state, and the first torsion arm and the second torsion arm are both attached to the mounting frame.

2. The optical system axis alignment device according to claim 1, wherein the self-unlocking limiting part is a memory alloy puller arranged at the lower end of the base, and the prism is arranged at the upper end of the base; the mounting frame has a limiting section parallel to the upper end surface of the base and a rotating column section inserted into the base, the limiting section is connected with the rotating column section, the base is provided with a through hole penetrating the base along the up-down direction of the base, the limiting section is provided with a limiting hole coaxially arranged with the through hole, and the pin column of the memory alloy puller is inserted into the limiting hole after penetrating the through hole, and the pin column is pulled out of the limiting hole after being electrified. The limiting section comprises a bottom plate and two side plates, the two side plates are arranged at intervals and have one end connected with the bottom plate, and the prism is arranged between the two side plates, and the limiting hole is arranged on the bottom plate. In the axis alignment state, the first torsion arm and the second torsion arm are arranged at an angle of 90 degrees. The base is provided with a fixing hole, the end of the first torsion arm is provided with a first bending section, and the first bending section is inserted into the fixing hole. The end of the second torsion arm is provided with a second bending section for increasing the contact area with the mounting frame. The torsion spring is a cylindrical helical torsion spring.

3. An optical system aligning apparatus according to claim 2, wherein: ​ 4. The optical system aligning apparatus according to claim 1, wherein: ​ 5. The optical system aligning apparatus according to claim 1, wherein: ​ 6. An aligning device for optical systems according to claim 1 or 5, characterized in that: ​ 7. The optical system aligning apparatus according to claim 1, wherein: ​

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