Axis correcting device of optical system

Abstract

The invention relates to the technical field of spaceflight, in particular to an axis calibration device of an optical system, which comprises a base, a torsion spring, a prism, a mounting frame and a self-unlocking limiting part. Wherein the base is arranged between a transmitting optical system and a receiving optical system of a to-be-calibrated axis of the optical system, and is fixed relative to the transmitting optical system and the receiving optical system of the to-be-calibrated axis. In the axis calibration state, the torsional spring provides rotating force for the prism, the self-unlocking type limiting part limits rotation of the prism, and the prism shields part of light paths of the transmitting optical system and the receiving optical system to be subjected to axis calibration and is used for collecting emergent light of the transmitting optical system and transmitting the emergent light to the receiving optical system to achieve axis calibration. When the axis correction state needs to be relieved, the self-unlocking type limiting part relieves limitation on the prism, under the action of the torsion spring, the installation frame drives the prism to rotate, light paths of the transmitting optical system and the receiving optical system are not shielded any more, the torsion spring recovers to the natural state, and limiting is provided for the prism.

Description

Technical Field

[0001] The invention relates to the field of aerospace technology, and in particular to an axis alignment device for an optical system. Background Art

[0002] In the aerospace field, rockets are equipped with optical measurement or monitoring systems. Since rockets vibrate and impact during flight, ignition, and separation, the optical system needs to be equipped with a shock absorber to protect the optical system. In order to understand the changes in the optical axis of the optical system after the impact and provide support for subsequent measurement and monitoring, it is necessary to install an axis calibration device at the front end of the optical system. The device has a prism that blocks part of the optical path of the optical system, and monitors the changes in the optical path to understand the changes in the axis system after the impact. Before the optical system starts to work, the prism needs to be rotated out of the optical path of the optical system without affecting the operation of the optical system. In the past, the rotation of the prism of the axis calibration device was often achieved through micro servo motors and electrical switches. This method requires additional circuit control, and a fixing device is required to fix the prism after it is in place, which is more troublesome to implement. Therefore, it is urgent to design an axis calibration device for an optical system with a simple structure and reliability. Summary of the invention

[0003] The object of the present invention is to provide an axis correction device for an optical system which is simple in structure and reliable.

[0004] In order to achieve the above object, the present invention provides an axis calibration device for an optical system, comprising:

[0005] A base is arranged between the transmitting optical system and the receiving optical system of the optical system whose axis is to be calibrated, and is fixed relative to the transmitting optical system and the receiving optical system;

[0006] The torsion spring has torsion arms at both ends being a first torsion arm and a second torsion arm respectively. In a natural state, the orthographic projections of the first torsion arm and the second torsion arm are located on the same straight line and in opposite directions.

[0007] A prism, wherein two opposing reflecting surfaces are both inclined at 45° and perpendicular to each other, and the prism is rotatably mounted on the base through a mounting frame. When in the axis alignment state, the prism blocks a part of the optical path of the transmitting optical system and the receiving optical system respectively, and is used to collect the emitted light of the transmitting optical system and transmit it to the receiving optical system. The first torsion arm is fixed to the base, and the second torsion arm is attached to the mounting frame. The first torsion arm and the second torsion arm are set at an angle to provide a rotational force for the prism;

[0008] The self-unlocking limit portion is used to limit the rotation of the mounting frame relative to the base, so that the prism remains in a relatively axial state. When the axial alignment state needs to be released, the self-unlocking limit portion releases the restriction on the prism, and under the action of the torsion spring, the mounting frame drives the prism to rotate and no longer blocks the optical path of the transmitting optical system and the receiving optical system. The torsion spring returns to a natural state, and the first torsion arm and the second torsion arm both rest on the mounting frame.

[0009] Optionally, the self-unlocking limiter is a memory alloy pin 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 to the rotating column section. The base is provided with a through hole that penetrates the base along the up and down directions of the base. The limiting section is provided with a limiting hole coaxially arranged with the through hole. The pin of the memory alloy pin puller passes through the through hole and is inserted into the limiting hole. After power is turned on, the pin is pulled out of the limiting hole.

[0011] Optionally, the limiting section includes a bottom plate and two side plates, the two side plates are spaced apart and each has one end connected to the bottom plate, the space between the two side plates is used to accommodate the prism, and the limiting hole is provided on the bottom plate.

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

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

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

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

[0016] The above technical solution of the present invention has the following advantages:

[0017] The optical system alignment device provided by the present invention comprises a base, a torsion spring, a prism, a mounting frame and a self-unlocking limiter. The base is arranged between the emitting optical system and the receiving optical system of the optical system to be aligned, and is fixed relative to the emitting optical system and the receiving optical system of the optical system to be aligned. The torsion arms at both ends of the torsion spring are respectively the first torsion arm and the second torsion arm. In a natural state, the orthographic projections of the first torsion arm and the second torsion arm are located on the same straight line and in opposite directions. The two opposite reflection surfaces of the prism are both inclined at 45° and perpendicular to each other. The prism is rotatably mounted on the base through the mounting frame. In the alignment state, the prism blocks a part of the optical path of the emitting optical system and the receiving optical system respectively, collects the outgoing light of the emitting optical system, and the two reflection surfaces of the prism are perpendicular to each other. The collected outgoing light is parallel to the direction of the outgoing light after passing through the two reflection surfaces, and the light beam is returned to the receiving optical system, thereby realizing the alignment task of the optical axis of the emitting optical system and the receiving optical system. The first torsion arm is fixed to the base, and the second torsion arm is attached to the mounting frame. The first torsion arm and the second torsion arm are set at an angle to store energy to provide rotational force for the prism. The self-unlocking limiter limits the rotation of the mounting frame relative to the base, so that the prism remains in a relatively axial state. When the axial alignment state needs to be released, the self-unlocking limiter releases the restriction on the prism. Under the action of the torsion spring, the mounting frame drives the prism to rotate and no longer blocks the optical path of the transmitting optical system and the receiving optical system. The torsion spring returns to its natural state, and the first torsion arm and the second torsion arm both rest on the mounting frame to provide a limit for the prism to prevent the prism from rotating. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings of the present invention are provided for illustrative purposes only, and the proportions and quantities of the components in the drawings may not necessarily be consistent with the actual products.

[0019] Figure 1 is a schematic top view of an axis alignment device for an optical system according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 Schematic diagram of the AA section;

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

[0022] Figure 4 yes Figure 3 A schematic diagram of the structure of the centering axis device from another angle;

[0023] Figure 5 is a structural schematic diagram of an optical system alignment device installed in an optical system and in an alignment state according to an embodiment of the present invention;

[0024] Figure 6 yes Figure 5 Schematic diagram of the centering axis device installed in the optical system and the optical system in working condition.

[0025] In the figure:

[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: limit section;

[0034] 421: bottom plate;

[0035] 422: side panels;

[0036] 5: Memory alloy pin puller;

[0037] 51: pin;

[0038] 100: Transmitting optical system;

[0039] 200: Receiving optical system. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] like Figure 1 and Figure 2 , Figure 5 and Figure 6As shown, an optical system alignment device provided by an embodiment of the present invention comprises a base 1, a torsion spring 2, a prism 3, a mounting bracket 4 and a self-unlocking limiter. The base 1 is arranged between the emitting optical system 100 and the receiving optical system 200 of the optical system to be aligned, and is fixed relative to the emitting optical system 100 and the receiving optical system 200 of the optical system to be aligned. The torsion arms at both ends of the torsion spring 2 are respectively the first torsion arm 21 and the second torsion arm 22. In a natural state, the orthographic projections of the first torsion arm 21 and the second torsion arm 22 are located on the same straight line and in opposite directions. The two opposite reflecting surfaces of the prism are inclined at 45° and perpendicular to each other. The prism 3 is rotatably mounted on the base 1 through the mounting bracket 4. In the alignment state, the prism 3 respectively blocks a part of the optical path of the emitting optical system 100 and the receiving optical system 200 to be aligned, and collects the outgoing light of the emitting 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 bracket 4. The first torsion arm 21 and the second torsion arm 22 are arranged at an angle to store energy and provide a rotational force for the prism 3. The self-unlocking limiter is used to limit the rotation of the mounting bracket 4 relative to the base 1, that is, when the torsion spring 2 applies a rotational force to the prism 3, the self-unlocking limiter limits the rotation of the prism 3, so that the prism is kept in a relatively axial state. Since the prism 3 blocks a part of the optical path of the two emitting optical systems 100 and the receiving optical system 200 to be calibrated, and is used to collect the outgoing light of the emitting optical system 100, the two reflecting surfaces of the prism 3 are perpendicular to each other, and the collected outgoing light is parallel to the direction of the outgoing light after passing through the two reflecting surfaces, and the light beam is returned to the receiving optical system 200. The control parts of the emitting optical system 100 and the receiving optical system 200 determine the coaxial situation according to the received light beam, and if necessary, compensate and adjust the emitting optical system 100 and the receiving optical system 200 to achieve the task of calibrating the optical axis of the emitting optical system 100 and the receiving optical system 200. It should be noted that the control parts of the emitting optical system 100 and the receiving optical system 200 are existing structures, and their compensation adjustment of the optical system is also existing technology, which will not be repeated here.

[0042] See also Figure 3 and Figure 4 As shown, when the axis calibration state needs to be released, the self-unlocking limit portion releases the restriction on the prism 3, and under the action of the torsion spring 2, the mounting bracket 4 drives the prism 3 to rotate, and no longer blocks the light paths of the two axes to be calibrated. The torsion spring 2 returns to its natural state, and the first torsion arm 21 and the second torsion arm 22 both rest on the mounting bracket 4, providing a limit for the prism 3 to prevent the prism 3 from rotating, so that the transmitting optical system 100 and the receiving optical system 200 can start to work normally.

[0043] See also Figure 5 and Figure 6As shown, in this embodiment, the transmitting optical system 100 and the receiving optical system 200 in the optical system are two lens structures, and the base 1 is located between the two lenses and is fixedly connected to the outer side of at least one of the lenses. Preferably, one side of the base 1 has an arc that matches the lens to achieve better matching and fixation with the lens. During the operation of the rocket, the prism 3 is always in an axis alignment state. If the optical path is not coaxial due to vibration or other reasons, the optical system can adjust itself. When the optical system is to work, the self-unlocking limiter releases the restriction 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 operation of the optical system.

[0044] In this embodiment, the self-unlocking limiter only needs to be able to realize convenient unlocking. For example, a fusible wire that can be melted by power or an electric telescopic rod or other structures. Preferably, the self-unlocking limiter is a memory alloy pin puller 5, which has a retractable pin 51. When power is applied, the pin 51 can be retracted to realize the release of the restriction on the prism 3.

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

[0046] See also Figure 2 to Figure 4 As shown, the mounting frame 4 has a limit section 42 parallel to the upper end surface of the base 1 and a rotating column section 41 inserted into the base 1, the limit section 42 is connected to the rotating column section 41, the base 1 is provided with a through hole penetrating the base 1 in the up and down direction of the base 1, the limit section 42 is provided with a limit hole coaxially arranged with the through hole, the pin 51 of the memory alloy pin puller 5 passes through the through hole and is inserted into the limit hole, and the pin 51 is pulled out from the limit after power is turned on. It should be noted that the rotation connection between the rotating column section 41 and the base 1 can adopt the existing structure, for example, it can be directly rotatably connected by matching the hole column size, or it can be realized by setting a bearing to achieve the rotation connection, which is not limited here.

[0047] See also 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 spaced apart and each has one end connected to the bottom plate 421 to form a structure with a U-shaped cross section. The two side plates 422 are used to accommodate the prism 3 , and the limiting hole is set on the bottom plate 421 .

[0048] In one example, in the axis alignment state, the first torsion arm 21 and the second torsion arm 22 are set at 90°. After the self-unlocking limit portion releases the restriction on the prism 3, the prism 3 rotates 90°, and the first torsion arm 21 and the second torsion arm 22 both rest on the mounting frame 4, providing a limit for the prism 3 to prevent the prism 3 from rotating.

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

[0050] In one example, a second bending section is provided at the end of the second torsion arm 22 to increase the contact area with the mounting bracket 4 .

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that not every embodiment contains only one independent technical solution. In the absence of a conflict of solutions, the various technical features mentioned in each embodiment can be combined in any manner to form other implementation methods that can be understood by those skilled in the art.

[0052] In addition, without departing from the scope of the present invention, the technical solutions described in the aforementioned embodiments may be modified, or some of the technical features may be replaced by equivalents, without causing the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An axis alignment device for an optical system, characterized in that: include: A base, arranged between the transmitting optical system and the receiving optical system of the optical system whose axis is to be calibrated, and fixed relative to the transmitting optical system and the receiving optical system; A torsion spring, wherein the torsion arms at both ends are respectively a first torsion arm and a second torsion arm, and in a natural state, the orthographic projections of the first torsion arm and the second torsion arm are located on the same straight line and in opposite directions; A prism, two opposite reflecting surfaces are inclined at 45 degrees and perpendicular to each other, the prism is rotatably mounted on the base through a mounting frame, and in an axis-aligned state, the prism blocks a part of the optical path of the transmitting optical system and the receiving optical system respectively, and is used to collect the emitted light of the transmitting optical system and transmit it to the receiving optical system, the first torsion arm is fixed to the base, the second torsion arm is attached to the mounting frame, and the first torsion arm and the second torsion arm are arranged at an angle to provide a rotational force for the prism; The self-unlocking limit portion is used to limit the rotation of the mounting frame relative to the base, so that the prism is maintained in a relatively axial state. When the axial alignment state needs to be released, the self-unlocking limit portion releases the restriction on the prism, and under the action of the torsion spring, the mounting frame drives the prism to rotate and no longer blocks the optical path of the transmitting optical system and the receiving optical system. The torsion spring returns to a natural state, and the first torsion arm and the second torsion arm both rest on the mounting frame.

2. The optical system alignment device according to claim 1, characterized in that: The self-unlocking limiter is a memory alloy pin puller, which is arranged at the lower end of the base, and the prism is located 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 to the rotating column section, the base is provided with a through hole penetrating the base along the up and down directions of the base, the limiting section is provided with a limiting hole coaxially arranged with the through hole, the pin of the memory alloy pin puller passes through the through hole and is inserted into the limiting hole, and the pin is pulled out of the limiting hole after power is turned on.

3. The optical system alignment device according to claim 2, characterized in that: The limiting section includes a bottom plate and two side plates. The two side plates are spaced apart and each has one end connected to the bottom plate. The space between the two side plates is used to accommodate a prism. The limiting hole is disposed on the bottom plate.

4. The axis alignment device for an optical system according to claim 1, characterized in that: In the shaft alignment state, the first torsion arm and the second torsion arm are arranged at 90 degrees.

5. The axis alignment device for an optical system according to claim 1, characterized in that: 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.

6. The axis alignment device for an optical system according to claim 1 or 5, characterized in that: A second bending section is provided at the end of the second torsion arm for increasing the contact area with the mounting frame.

7. The axis alignment device for an optical system according to claim 1, characterized in that: The torsion spring is a cylindrical helical torsion spring.

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