Light path adjusting device and light path adjusting method of afocal optical system with steering function

Abstract

The invention provides a light path adjusting device and a light path adjusting method of an afocal optical system with steering. The device comprises an auto-collimation collimator, a horizontal reference assembly and a vertical reference assembly. The adjusting method comprises the steps of main lens cone connection positioning surface correction, reference reflector correction and main lens cone reflector adjustment. According to the device, the horizontal reference reflector is used for firstly adjusting the horizontal reference of the mounting and positioning surface of the afocal optical system (optical path product) to be adjusted, then the vertical reference reflector is used for adjusting the vertical reference, and the adjusting method can be used for adjusting the incident and incident light angle of the afocal optical system with the steering function and adjusting the collimation of the system. The device is simple and convenient in operation mode and remarkable in effect, and ensures that the incident light angle and the collimation performance of the product are excellent.

Description

Technical Field

[0001] The invention belongs to the technical field of optical system detection, and in particular relates to an optical path adjustment device and an optical path adjustment method for an afocal optical system with steering. Background Art

[0002] An afocal optical system refers to an optical system with an infinite focal length, that is, when a beam of parallel light enters the afocal optical system, the outgoing light is still a beam of parallel light. The collimation of an afocal optical system refers to the ability of the optical system to keep parallel light beams passing through its system parallel or approximately parallel. In an optical system, if a parallel light beam can remain parallel after passing through the optical system, the system is said to have good collimation. An afocal optical system usually includes two main components, the primary mirror and the secondary mirror. When the focal points of the two components completely coincide, the collimation of the system reaches the best state. To achieve this goal, it is required to adjust the focal positions of the primary mirror and the secondary mirror of the primary lens barrel. In addition to adjusting the collimation of the system, if the system is a non-centrosymmetric system with steering, it is also necessary to adjust the angles of the incident and outgoing light of the system at the same time. If the collimation of the primary lens barrel is poor and the angles of the incident and outgoing light are deviated, the light will not be able to remain parallel when passing through the primary lens barrel, resulting in blurred imaging, distortion or aberration.

[0003] At present, the collimation and incident light angle of the main mirror tube can be adjusted by using professional equipment such as a spectrometer to calibrate the main mirror tube. This equipment has two self-collimating collimating light tubes, which are placed on a turntable with an adjustable angle scale. First, the angle between the two self-collimating light tubes is set according to the theoretical incident light angle of the system to be adjusted. One of the self-collimating collimating light tubes emits parallel light, which emits quasi-parallel light after passing through the main mirror tube to be adjusted. The quasi-parallel light is received by the other self-collimating collimating light tube. The collimation and incident light angle of the main mirror tube are judged to be qualified by the imaging position and clarity of the received quasi-parallel light, and corresponding adjustments are made accordingly. However, this type of equipment itself is large in size and high in price, and it is necessary to make suitable positioning tooling for the product structure to be adjusted. The collimation adjustment operation process for such products is relatively cumbersome, and due to the influence of the complexity of the adjustment, the adjustment cumulative error is large, which affects the imaging quality of the main mirror tube. Summary of the invention

[0004] In order to solve the above problems, the present invention discloses an optical path adjustment device and an optical path adjustment method for an afocal optical system with steering. The device can quickly and conveniently adjust the horizontal and vertical references of the product placement adjustment optical path, and then quickly adjust the collimation and incident light angles of the product based on the horizontal and vertical references. The device has the advantages of simple operation, significant effect, and can ensure excellent product performance.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: an optical path adjustment device for an afocal optical system with steering, the device comprising a self-collimating parallel light tube, a horizontal reference component, and a vertical reference component; wherein:

[0006] Self-collimating collimator includes:

[0007] First beam splitter prism;

[0008] A graticule, arranged on one side of the first beam splitter prism;

[0009] Light source; arranged on one side of the reticle;

[0010] An imaging receiving device, which is electrically connected to the display and is disposed on one side of the first beam splitter prism, wherein the target surface of the imaging receiving device and the dividing surface of the dividing plate are symmetrical with respect to the beam splitting surface of the first beam splitter prism;

[0011] A collimating objective lens is arranged on one side of the first beam splitter prism, and the optical axes of the collimating objective lens, the first beam splitter prism, the imaging receiving device and the graticule are aligned;

[0012] The horizontal reference components include:

[0013] A second beam splitter prism, which splits the parallel light emitted by the self-collimating collimator into two paths, one path of light propagates along the original path, and the other path of light is reflected by the reflective surface of the second beam splitter prism and then turned upward by 90 degrees;

[0014] An adjusting device having a mounting positioning surface;

[0015] A horizontal reference reflector, which is arranged on the installation positioning surface and serves as a reference light for adjusting the alignment between the installation positioning surface and the self-collimation collimator by reflecting the parallel light of the self-collimation collimator;

[0016] The vertical reference components include:

[0017] An adjustment platform, which is arranged on one side of the adjustment device;

[0018] A vertical reference reflector is arranged on the adjustment platform to reflect the parallel light of the self-collimating collimator. The adjustment platform is used to adjust the alignment of the reference reflector and the self-collimating collimator.

[0019] Preferably, the adjustment device is a cup body reference piece connected to the self-collimating parallel light pipe, and the cup body reference piece has a horizontal hole and a vertical hole through which light can pass;

[0020] The parallel light emitted from the self-collimating collimator through the vertical hole is reflected by the vertical reference reflector and then received by the imaging receiving device as its reflected cross image; the parallel light emitted from the self-collimating collimator through the horizontal hole is reflected by the second beam splitting prism through the beam splitting surface and then received by the imaging receiving device as its reflected cross image.

[0021] Preferably, the installation positioning surface is aligned with the installation positioning surface of the main lens barrel of the afocal optical system to be adjusted.

[0022] A method for adjusting a light path of a light path adjusting device of an afocal optical system with steering, comprising the following steps:

[0023] Step S1: Reference mirror calibration

[0024] The self-collimating collimator emits parallel light, which is divided into two paths of light by the second beam splitter prism. One path of light is emitted through the vertical hole and is received by the imaging receiving device after being reflected by the vertical reference reflector. The center of the reflected cross image of the reference reflector is adjusted to the center of the screen by the adjustment platform.

[0025] The other path is received by the imaging receiving device after being reflected by the splitting surface of the second splitting prism and the horizontal reference reflector, and the center of the reflected cross image of the reflector is adjusted to the center of the screen by the adjusting device;

[0026] Step S2: Main barrel mirror adjustment

[0027] Remove the horizontal reference reflector on the mounting positioning surface, install the main lens barrel on the adjustment device, and the parallel light from the self-collimating collimator is reflected by the beam splitting surface of the second beam splitter prism and then enters the main lens barrel to be adjusted vertically upward. The parallel light passes through the internal optical system of the main lens barrel and the reflector placed at 45 degrees and then emits parallel light horizontally. It is received and reflected by the vertically placed reference reflector and finally received by the imaging receiving device. By adjusting the reflector placed at 45 degrees of the main lens barrel, the reflected cross image on the screen is adjusted to the center of the screen to complete the adjustment.

[0028] Step S3: Adjustment of optical path collimation

[0029] If the clarity of the reflected cross image of the main lens barrel is poor, the focusing assembly inside the main lens barrel is adjusted to make the reflected cross image clear, thereby completing the adjustment of the optical path collimation of the main lens barrel.

[0030] Preferably, in step S1, the reflected image positions of the horizontal reference reflector and the vertical reference reflector placed on the installation positioning surface are adjusted to the center of the screen, and the reference of the product to be adjusted is transferred to the vertical reference reflector.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: the device uses a horizontal reference reflector to first adjust the horizontal reference of the installation positioning surface of the optical path product to be adjusted, and then adjusts the vertical reference through a vertical reference reflector to complete the transfer of the reference, and finally through the adjustment of the product reflector, the adjustment method can not only adjust the output light angle of the steering afocal optical system, but also adjust the system collimation. The device is simple to operate, has significant effects, and ensures excellent product collimation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a diagram of the optical path adjustment device of the present invention;

[0033] Figure 2 This is a diagram showing the adjustment of the main barrel reflector of the present invention;

[0034] Figure 3 It is a diagram showing the structure of the adjustment platform of the present invention.

[0035] In the figure: 1-light source; 2-CCD; 3-first beam splitter prism; 4-graticule; 5-collimating objective lens; 6-base; 7-copper ring; 7a-vertical hole; 7b-horizontal hole; 8-second beam splitter prism; 9-horizontal reference reflector; 11-adjustment rod; 12-angle adjustment plate; 13-vertical reference reflector; 15-lens; 16-reflector; 17-adjustment screw. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application as claimed, but is merely representative of selected embodiments of the present application.

[0038] Refer to the attached Figure 1-3 As shown, the present invention provides an optical path adjustment device for an afocal optical system with steering, the device comprising a self-collimating parallel light pipe, a horizontal reference component, and a vertical reference component; wherein,

[0039] like Figure 1 As shown, the self-collimating parallel light tube includes:

[0040] The first beam splitter prism 3.

[0041] The graticule 4 is arranged on one side of the first beam splitter prism 3 .

[0042] The light source 1 is arranged on one side of the graticule 4.

[0043] The imaging receiving device, preferably CCD2, is electrically connected to the display and is arranged on one side of the first beam splitter prism 3. Its target surface and the dividing surface of the dividing plate 4 are symmetrical relative to the beam splitting surface of the first beam splitter prism 3.

[0044] The collimating objective lens 5 is arranged on one side of the first beam splitter prism 3 , and the optical axes of the collimating objective lens 5 , the first beam splitter prism 3 , the imaging receiving device and the graticule 4 are aligned.

[0045] like Figure 1 As shown, the horizontal reference assembly includes:

[0046] The second beam splitter prism 8 splits the parallel light emitted by the self-collimating collimator into two paths, one path of light propagates along the original path, and the other path of light is reflected by the reflective surface of the second beam splitter prism 8 and then turned upward by 90 degrees.

[0047] The adjusting device comprises a base 6 arranged on one side of a collimating objective lens 5, a copper ring 7 is adjustably arranged on the base 6 (the copper ring 7 is connected to the base 6 by a circumferential screw), a second dichroic prism 8 which is in communication with the collimating objective lens 5 and can be adjusted for collimation is arranged at the center of the copper ring 7, and a vertical hole 7a and a horizontal hole 7b are provided in the copper ring 7 for light to pass through, the vertical hole emits parallel light from a self-collimating collimator, and after being reflected by a vertical reference reflector 13, a reflected cross image thereof is received by an imaging receiving device, and the horizontal hole emits parallel light emitted from the self-collimating collimator and reflected by a dichroic surface of the dichroic prism, the parallel light has two functions, one is that after being reflected by a horizontal reference reflector 9 placed on a mounting and positioning surface, the reflected cross image thereof is received by the imaging receiving device, and the other is that the parallel light is received by a main lens barrel to be adjusted, and after passing through an internal optical system of the main lens barrel, the light is reflected by the vertical reference reflector 13 and returns to the original path, and the reflected cross image thereof is received by the imaging receiving device.

[0048] The horizontal reference reflector 9 is detachably arranged on the adjusting device (copper ring 7) and guides the alignment between the mounting positioning surface of the adjusting device (i.e. the top surface of the copper ring 7) and the self-collimating parallel light tube.

[0049] The vertical reference reflector 13 is arranged on the installation positioning surface and serves as a reference light for adjusting the alignment between the installation positioning surface and the self-collimation collimator by reflecting the parallel light of the self-collimation collimator.

[0050] like Figure 1 As shown, the vertical reference assembly includes:

[0051] The adjustment platform is arranged on one side of the adjustment device, and its specific structure is as follows Figure 1As shown, it includes an adjusting mechanism that can be adjusted in displacement along three axes (the adjusting mechanism is preferably through plates in different directions and the plates are connected by screw guides, and each plate is provided with an adjusting rod 11. By rotating the adjusting rod 11, the corresponding plate can be driven to be adjusted in displacement along three axes), and an angle adjusting plate 12 is provided on the top of the adjusting mechanism and can be rotated toward the direction of the copper ring 7 to adjust its position and angle.

[0052] A vertical reference reflector 13 is disposed on the adjustment platform to reflect the parallel light of the self-collimating collimator. The adjustment platform is used to adjust the alignment between the reference reflector 13 and the self-collimating collimator.

[0053] like Figure 2 As shown, the afocal optical system with steering is a product adjusted by the optical path adjustment device of the present patent, and the steering device is arranged on the adjustment device, and has from bottom to top:

[0054] A lens 15 is arranged on the upper side of the mounting positioning surface;

[0055] The reflector 16 is disposed on the upper side of the lens 15 .

[0056] Specifically, the parallel light emitted from the hole 7b is emitted horizontally through the lens and reflector of the afocal optical system with steering, and then reflected by the vertical reference reflector 13 and finally received by the CCD2. The image is adjusted to the center of the screen by adjusting the reflector 16.

[0057] Based on the above device, the present application also provides a light path adjustment method of a light path adjustment device of an afocal optical system with steering, comprising the following steps:

[0058] Step S1: Calibration of the vertical reference reflector 13

[0059] The self-collimating collimator emits parallel light, which is divided into two paths by the second beam splitter prism 8. One path is directly reflected by the vertical reference reflector 13 and then received by the imaging receiving device, and the center of the reflected cross image of the reference reflector 13 is adjusted to the center of the screen.

[0060] The other path is reflected by the splitting surface of the second splitter prism 8 and the horizontal reference reflector 9 and then received by the imaging receiving device. The center of the reflected cross image of the reflector 9 is adjusted to the center of the screen through the adjustment table.

[0061] Step S2: Adjustment of the main barrel reflector 16

[0062] Remove the horizontal reference reflector 9 on the mounting positioning surface, and install the main lens barrel on the adjusting device. The parallel light from the self-collimating collimator is reflected by the beam splitting surface of the second beam splitter prism 8 and then enters the main lens barrel to be adjusted vertically upward. The parallel light passes through the internal optical system of the main lens barrel and the reflector 16 placed at 45 degrees and then emits parallel light horizontally. It is received and reflected by the vertical reference reflector 13 and finally received by the imaging receiving device. By adjusting the reflector 16 placed at 45 degrees of the main lens barrel, the reflected cross image on the screen is adjusted to the center of the screen to complete the adjustment.

[0063] Step S3: Adjustment of optical path collimation

[0064] If the clarity of the reflected cross image of the main lens barrel is poor, it means that the optical system inside the main lens barrel is out of focus. The focusing component inside the main lens barrel is adjusted to make the reflected cross image clear, thereby completing the adjustment of the optical path collimation of the main lens barrel.

[0065] The principle of the optical path adjustment device of the above-mentioned afocal optical system with steering is mainly as follows:

[0066] The principle of the present application is as follows: firstly, by placing a reference reflector 9 on the copper ring 7, the self-collimating collimator emits parallel light, and the position of the copper ring 7 is adjusted, and when the reflected light of the horizontal reference reflector 9 appears a cross image in the middle on the screen connected to the imaging receiving device, that is, the mounting positioning surface of the top port of the copper ring 7 and the alignment of the self-collimating collimator are adjusted, then a reference reflector 13 is placed on the adjustment table on the right side of the copper ring 7, and the self-collimating collimator emits parallel light, which is divided into two paths of light by the second beam splitter prism 8, one of which is directly reflected by the reference reflector 13 and then received by the imaging receiving device, and the vertical line of the reflected image of the reference reflector 13 is adjusted to the center of the screen of the imaging receiving device through the adjustment table.

[0067] Then install the main lens barrel (product) on the copper ring 7, adjust the reflector 16 of the main lens barrel, and adjust the reflected image received by the imaging receiving device to the center of its screen (cross spot), thus completing the collimation adjustment of the main lens barrel.

[0068] Although the embodiments of the present invention have been shown and described, it is obvious that many modifications and variations can be made according to the contents of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can better understand and use the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An optical path adjustment device for an afocal optical system with steering, characterized in that: The device comprises a self-collimating parallel light tube, a horizontal reference component and a vertical reference component; wherein, Self-collimating collimator includes: First beam splitter prism; A graticule, arranged on one side of the first beam splitter prism; Light source; arranged on one side of the reticle; An imaging receiving device, which is electrically connected to the display and is disposed on one side of the first beam splitter prism, wherein the target surface of the imaging receiving device and the dividing surface of the dividing plate are symmetrical with respect to the beam splitting surface of the first beam splitter prism; A collimating objective lens is arranged on one side of the first beam splitter prism, and the optical axes of the collimating objective lens, the first beam splitter prism, the imaging receiving device and the graticule are aligned; The horizontal reference components include: A second beam splitter prism, which splits the parallel light emitted by the self-collimating collimator into two paths, one path of light propagates along the original path, and the other path of light is reflected by the reflective surface of the second beam splitter prism and then turned upward by 90 degrees; An adjusting device having a mounting positioning surface; A horizontal reference reflector, which is arranged on the installation positioning surface and serves as a reference light for adjusting the alignment between the installation positioning surface and the self-collimation collimator by reflecting the parallel light of the self-collimation collimator; The vertical reference components include: An adjustment platform, which is arranged on one side of the adjustment device; A vertical reference reflector is arranged on the adjustment platform to reflect the parallel light of the self-collimating collimator. The adjustment platform is used to adjust the alignment of the reference reflector and the self-collimating collimator.

2. The optical path adjustment device of the afocal optical system with steering according to claim 1, characterized in that: The adjustment device is a cup body reference piece connected to the self-collimating parallel light tube, and the cup body reference piece has a horizontal hole and a vertical hole through which light can pass; The parallel light emitted from the vertical hole from the self-collimating collimator is reflected by the vertical reference reflector and then received by the imaging receiving device as a reflected cross image; The parallel light emitted from the horizontal hole from the self-collimating parallel light tube and reflected by the second beam splitter prism is reflected by the horizontal reference reflector and then received by the imaging receiving device.

3. The optical path adjustment device of the afocal optical system with steering according to claim 1, characterized in that: The installation positioning surface is aligned with the installation positioning surface of the main lens barrel of the afocal optical system to be adjusted.

4. A method for adjusting the optical path of an optical path adjusting device of an afocal optical system with steering as claimed in claim 1, characterized in that: The following steps are involved: Step S1: Reference mirror calibration The self-collimating collimator emits parallel light, which is divided into two paths of light by the second beam splitter prism. One path of light is emitted through the vertical hole and is received by the imaging receiving device after being reflected by the vertical reference reflector. The center of the reflected cross image of the reference reflector is adjusted to the center of the screen by the adjustment platform. The other path is received by the imaging receiving device after being reflected by the splitting surface of the second splitting prism and the horizontal reference reflector, and the center of the reflected cross image of the reflector is adjusted to the center of the screen by the adjusting device; Step S2: Main barrel mirror adjustment Remove the horizontal reference reflector on the mounting positioning surface, install the main lens barrel on the adjustment device, and the parallel light from the self-collimating collimator is reflected by the beam splitting surface of the second beam splitter prism and then enters the main lens barrel to be adjusted vertically upward. The parallel light passes through the internal optical system of the main lens barrel and the reflector placed at 45 degrees and then emerges horizontally. It is received and reflected by the vertically placed reference reflector and finally received by the imaging receiving device. By adjusting the reflector placed at 45 degrees of the main lens barrel, the reflected cross image on the screen is adjusted to the center of the screen to complete the adjustment. Step S3: Adjustment of optical path collimation If the clarity of the reflected cross image of the main lens barrel is poor, the focusing assembly inside the main lens barrel is adjusted to make the reflected cross image clear, thereby completing the adjustment of the optical path collimation of the main lens barrel.

5. The optical path adjustment method of the optical path adjustment device of the afocal optical system with steering according to claim 4, characterized in that: In the step S1, the reflected image positions of the horizontal reference reflector and the vertical reference reflector placed on the installation positioning surface are adjusted to the center of the screen, and the reference of the product to be adjusted is transferred to the vertical reference reflector.

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