Spherical prism optical axis deflection angle detection device

Abstract

The utility model provides a spherical prism optical axis deflection angle detection device, which is provided with a base and a supporting structure, and comprises a transmission-type coaxial eccentric detection light path and a transmission-type non-coaxial eccentric detection light path. Wherein the transmission-type coaxial eccentric detection light path comprises a collimator, an objective table and a photoelectric centering instrument; the transmission-type non-coaxial eccentric detection light path comprises a photoelectric autocollimator, an objective table and a photoelectric centering instrument; and the two detection light paths share the objective table and the photoelectric centering instrument. The collimator and the supporting structure are arranged at the two ends of the base respectively, the rotating mechanical arm A and the rotating mechanical arm B are arranged on the supporting structure, the photoelectric centering instrument is arranged on a guide rail at the top end of the rotating mechanical arm A in a sliding mode, and the photoelectric autocollimator is arranged on the rotating mechanical arm B. And a CCD camera is arranged at the right end of the photoelectric autocollimator. The detection device provided by the utility model is designed to be a double-optical-path detection system, so that the detection of the deflection angle of the optical axis of the spherical prism is realized.

Description

Technical Field

[0001] This utility model belongs to the field of optical detection methods and instruments, specifically relating to a device for detecting the optical axis deflection angle of a spherical prism. Background Technology

[0002] With the rapid development of modern space science, bioengineering, deep-sea exploration, information technology, and defense technology, the development and application of non-coaxial optical systems are increasing. A non-coaxial optical system refers to an optical system where the optical axis of the optical surface does not coincide with the optical axis of the system, and it lacks an axis of symmetry. Spherical prisms are one of the commonly used optical elements in non-coaxial optical systems, characterized by their small size, light weight, and compact structure. By rationally utilizing spherical prism elements, a series of optical systems with different applications can be designed. Currently, products and systems on the market include helmet-mounted displays, airborne periscopes, low-light night vision devices, projectors, AR / VR displays, and optical waveguides. As demand increases, the shapes and types of spherical prisms are becoming more diverse, and the precision requirements are gradually increasing.

[0003] Because of the deflection of the optical axis of a spherical prism, detecting and controlling the deviation between the actual and theoretical optical axes is a major challenge. Current processing mainly relies on directly assembling the product into the system to confirm whether it meets the usage requirements, which is time-consuming, labor-intensive, and extremely inconvenient. The testing instruments currently used are only designed for single prisms or lenses, such as the center offset instrument used to detect lens eccentricity and the goniometer used to detect the optical axis deflection angle of a prism. Neither of these instruments can image the optical axis of a spherical prism, and therefore cannot be measured. As a result, there are no relevant testing instruments for detecting the optical axis deflection angle of a spherical prism. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to provide a spherical prism optical axis deflection angle detection device that can adapt to the detection requirements of spherical prism optical axis deflection angles with different deflection angles.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A spherical prism optical axis deflection angle detection device is provided, comprising a base and a support structure, including a transmission-type coaxial eccentric detection optical path and a transmission-type non-coaxial eccentric detection optical path; the transmission-type coaxial eccentric detection optical path includes a collimator, a stage, and a photoelectric centering device; the transmission-type non-coaxial eccentric detection optical path includes a photoelectric autocollimator, a stage, and a photoelectric centering device; the two detection optical paths share the stage and the photoelectric centering device, and the collimator, photoelectric autocollimator, and photoelectric centering device are arranged in a triangular pattern; the collimator and the support structure are respectively located at both ends of the base, and a rotating robotic arm A and a rotating robotic arm B are provided on the support structure, the top end of the rotating robotic arm A is provided with a guide rail, the photoelectric centering device is slidably mounted on the guide rail, and the photoelectric autocollimator is mounted on the rotating robotic arm B.

[0007] Furthermore, the collimator has an illumination crosshair inside; the photoelectric centering instrument has an eyepiece and an objective lens, and the photoelectric centering instrument has a crosshair reticle inside.

[0008] Both the rotary robotic arm A and the rotary robotic arm B are equipped with locking devices between themselves and the supporting structure.

[0009] A CCD camera is installed at the right end of the photoelectric autocollimator.

[0010] The platform is equipped with a three-jaw chuck.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] The detection device of this invention is designed as a dual-optical-path detection system. One path is used to detect the eccentricity of optical elements or systems with a rotational symmetry axis, and the other path is used to detect the eccentricity of non-coaxial optical elements or systems. The core components of the detection device, the photoelectric autocollimator and the photoelectric centering instrument, are mounted on a rotating robotic arm to adjust and ensure the spatial position and angular relationship between them. During measurement, a suitable detection optical path is selected according to the characteristics of the optical axis of the element or system under test, thus completing the detection of the optical axis deflection angle of the spherical prism. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a spherical prism optical axis deflection angle detection device according to the present invention;

[0014] Figure 2 This is a schematic diagram of the visual reticle display of a photoelectric centering instrument;

[0015] Figure 3 This is a schematic diagram of the optical path for detecting the center offset of the lens;

[0016] Figure 4 This is a schematic diagram of the optical axis deflection angle detection of a spherical right-angle prism;

[0017] Figure 5This is a schematic diagram for detecting the optical axis deflection angle of a spherical semi-pentagonal prism. Detailed Implementation

[0018] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Reference Figure 1-5 A spherical prism optical axis deflection angle detection device is provided, comprising a base 1 and a support structure 2, including a transmission-type coaxial eccentricity detection optical path and a transmission-type non-coaxial eccentricity detection optical path, used respectively for detecting the eccentricity of a lens with a rotational symmetry axis and for detecting the eccentricity of a non-coaxial optical element. It should be noted that the lens is a coaxial spherical optical element, while the spherical prism is a non-coaxial optical element in the following description. The transmission-type coaxial eccentricity detection optical path includes a collimator 8, a stage 10, and a photoelectric centering device 12; the transmission-type non-coaxial eccentricity detection optical path includes a photoelectric autocollimator 7, a stage 10, and a photoelectric centering device 12; the two detection optical paths share the stage 10 and the photoelectric centering device 12. The collimator 8, the photoelectric autocollimator 7, and the photoelectric centering device 12 are arranged in a triangular pattern, and the angles between the three can be freely adjusted and calibrated to meet the eccentricity detection needs of different optical elements or systems. The parallel light tube and the support structure are respectively located at both ends of the base. The support structure is equipped with a rotating mechanical arm A4 and a rotating mechanical arm B5. The top of the rotating mechanical arm A4 is equipped with a guide rail 15. The photoelectric centering instrument 12 is slidably mounted on the guide rail 15. The photoelectric autocollimator 7 is mounted on the rotating mechanical arm B5.

[0020] The collimator has an illumination crosshair 9 inside; the photoelectric centering instrument has an eyepiece 13 and an objective lens 11, and the photoelectric centering instrument has a crosshair reticle 18 inside.

[0021] Both the rotary robotic arms A4 and B5 are equipped with locking devices 3 between themselves and the supporting structure. The photoelectric centering instrument achieves its detection purpose by aligning the focal point of its objective lens with the focal point of the sample being tested. Therefore, the distance between the objective lens and the sample needs to be adjustable, and a locking device 14 is required when the instrument is in a fixed position. Considering that a long guide rail would increase the overall weight, reinforcing ribs are installed between the guide rail and robotic arm A to improve overall rigidity and stability.

[0022] The photoelectric autocollimator is equipped with a CCD camera 6 at its right end.

[0023] The platform is equipped with a three-jaw chuck.

[0024] The dual-arm rotating mechanism, consisting of rotating robotic arm A and rotating robotic arm B, is used to adjust and ensure the spatial position and angular relationship between the photoelectric autocollimator and the photoelectric centering instrument. The main implementation schemes are as follows.

[0025] Option 1:

[0026] To quickly adjust and calibrate the theoretical position, the rotation of the dual arms is designed to be driven by high-precision motors, and matched with software and auxiliary calculation programs. The theoretical deflection angle is input into the software, and servo motors A and B, equipped with photoelectric encoders, drive the photoelectric centering measuring device and angle measuring device respectively, causing the photoelectric autocollimator to rotate to the theoretical deflection angle position. Specifically, the guide rail of the centering measuring device is fixedly connected to servo motor A. The collimator is fitted into a sleeve, which is connected to servo motor B. The collimator and the outer sleeve are assembled with a small clearance fit (allowing for a certain distance of left and right movement of the collimator), and are secured to the side of the sleeve with bolts, thus achieving the adjustment and fixation of the optical path.

[0027] Taking the testing of a non-coaxial spherical prism as an example, the spherical prism to be tested is placed on the stage, and its position is adjusted so that its plane is aligned with the photoelectric autocollimator. This ensures that the parallel light emitted by the photoelectric autocollimator is perpendicularly incident into the spherical prism to be tested. The vertical position of the centering measuring device is adjusted until the focal image of the spherical prism to be tested is observed. At this time, the difference between the actual image point and the theoretical image point of the spherical prism to be tested is measured in the software, which is the optical axis deflection angle of the spherical prism.

[0028] Option 2:

[0029] Without software and a high-precision motor drive, a calibration block is needed to determine the theoretical deflection angle of the spherical prism being measured (the calibration block is made of a standard prism and a standard plano-convex or plano-concave lens bonded together). The angles of the angle measuring device—the autocollimator and the centering measuring device—are adjusted using the calibration block. Simultaneously, the vertical position of the centering measuring device is adjusted. The focal image of the calibration block can be observed on the reticle of the centering measuring device, thus completing the calibration. By manually rotating the support arms of the autocollimator and the centering measuring device, a straight-through optical path structure or an oblique incidence optical path structure can be formed. A fine-adjustment and locking device is required at the mounting points of the support arms of the autocollimator and the centering measuring device to ensure the alignment of the optical path.

[0030] Remove the standard block and place the spherical prism to be measured on the stage. Adjust the position of the spherical prism so that its plane is just perpendicular to the autocollimator. This ensures that the parallel light emitted by the autocollimator is incident perpendicularly into the spherical prism to be measured. Observe the focal image of the spherical prism to be measured. At this time, measure the difference between the actual image point of the spherical prism to be measured and the image point of the standard block, and you can calculate the optical axis deflection angle of the spherical prism.

[0031] When using this utility model:

[0032] First, select the detection optical path: During measurement, select a suitable detection optical path according to the characteristics of the optical axis of the optical element or system under test;

[0033] Secondly, calibration and standardization: After the detection optical path is selected, the detection optical path is first calibrated and standardized;

[0034] For the inspection of coaxial optical elements or systems: a transmission-type coaxial eccentricity detection optical path is used. The lens product is placed on the stage, and the parallel light emitted by the collimator is focused after passing through the product. The focus of the photoelectric centering objective is adjusted to coincide with the focus of the product being tested, and the eccentricity of the product can be detected.

[0035] For the testing of non-coaxial optical elements or systems: a transmission-type non-coaxial eccentric detection optical path is used. The spherical prism under test is placed on the stage, with the plane of the spherical prism as the incident surface. It is oriented towards the photoelectric autocollimator. The spherical prism under test is adjusted so that the parallel light emitted by the photoelectric autocollimator is completely perpendicular to the spherical prism under test. The light is refracted and emitted from the spherical prism under test according to its specific optical path. The photoelectric centering instrument is rotated and its height is adjusted so that the focal point of the spherical prism and the focal point of the objective lens of the photoelectric centering instrument are on the same focal plane. The spherical prism under test is then imaged on the crosshairs of the photoelectric centering instrument. The difference between this image and the calibrated position of the photoelectric centering instrument is the optical axis deflection angle of the spherical prism. Example 1:

[0036] See Figure 1 A fixed parallel light tube 8 is located on the upper part of the marble base 1, which emits a parallel light source. This light source can be turned on or off as needed. The photoelectric autocollimator 7 and the photoelectric centering instrument 12 can be adjusted at any angle within the range of 0-90° by rotating robotic arm B and rotating robotic arm A, respectively, so as to form a standard detection optical path with the spherical prism sample being tested.

[0037] See Figure 2 The part to be tested, 19, is a spherical lens. Turn on the power of the collimator 8 and turn off the power of the photoelectric autocollimator 7. Place the zero-eccentric spherical lens sample on the stage 10. In the photoelectric centering instrument 12, the crosshair image 16 (calibrated position) is seen to be aligned with the middle of the crosshair plate 18 at the eyepiece end. Fix the position of the photoelectric centering instrument 12, remove the sample, and then place the spherical lens to be tested on the stage 10. Manually rotate the lens one to two revolutions. It can be seen that the spherical center image of the lens to be tested makes a certain range of circular jump on the crosshair plate 18 in the photoelectric centering instrument 12. The range of circular jump is the eccentricity difference. Example 2:

[0038] See Figure 4The part under test 20 is a spherical right-angle prism. At this time, the photoelectric autocollimator 7 and the photoelectric centering instrument 12 form a 90° angle. Turn off the power of the collimator 8, place the zero-eccentric spherical right-angle prism sample on the stage 10, turn on the photoelectric autocollimator 7, so that the parallel light is perpendicularly incident on the right-angle surface of the sample, fix the photoelectric autocollimator 7, adjust the photoelectric centering instrument 12, so that the seen crosshair image 16 is aligned with the zero position of its crosshair plate 18, fix the photoelectric centering instrument 12; place the spherical right-angle prism under test on the stage 10, adjust the position of the prism, so that the parallel light from the photoelectric autocollimator 7 is perpendicularly incident on the right-angle surface, and observe the distance between the crosshair image 17 in the photoelectric centering instrument 12 and the zero position of the center of the crosshair plate 18, which is the optical axis deflection angle of the part under test. Example 3:

[0039] See Figure 5 The component under test, 21, is a spherical semi-pentagonal prism. At this time, the photoelectric autocollimator 7 and the photoelectric centering instrument 12 form a 135° angle. Turn off the power of the collimator 8, place the zero-eccentric spherical semi-pentagonal prism sample on the stage 10, turn on the photoelectric autocollimator 7, and make the parallel light perpendicularly incident on the incident surface of the sample's optical path. Fix the photoelectric autocollimator 7, adjust the photoelectric centering instrument 12, and make the seen crosshair image 16 aligned with the zero position of its crosshair plate 18. Fix the photoelectric centering instrument 12. Place the spherical semi-pentagonal prism under test on the stage 10, adjust the position of the prism, and make the parallel light from the photoelectric autocollimator 7 perpendicularly incident on the incident surface of the optical path. Observe the distance between the crosshair image 17 in the photoelectric centering instrument 12 and the zero position of the center of the crosshair plate 18, which is the optical axis deflection angle of the component under test.

Claims

1. A device for detecting the optical axis deflection angle of a spherical prism, comprising a base and a support structure, characterized in that, The system includes a transmissive coaxial eccentric detection optical path and a transmissive non-coaxial eccentric detection optical path. The transmissive coaxial eccentric detection optical path includes a collimator, a stage, and a photoelectric centering device. The transmissive non-coaxial eccentric detection optical path includes a photoelectric autocollimator, a stage, and a photoelectric centering device. The two detection optical paths share a stage and a photoelectric centering device. The collimator, photoelectric autocollimator, and photoelectric centering device are arranged in a triangular pattern. The collimator and the support structure are located at opposite ends of the base. A rotating robotic arm A and a rotating robotic arm B are mounted on the support structure. A guide rail is provided at the top of the rotating robotic arm A, and the photoelectric centering device is slidably mounted on the guide rail. The photoelectric autocollimator is mounted on the rotating robotic arm B.

2. The spherical prism optical axis deflection angle detection device according to claim 1, characterized in that, The collimator has an illumination crosshair inside; the photoelectric centering instrument has an eyepiece and an objective lens, and the photoelectric centering instrument has a crosshair reticle inside.

3. The spherical prism optical axis deflection angle detection device according to claim 1, characterized in that, Both the rotary robotic arm A and the rotary robotic arm B are equipped with locking devices between themselves and the supporting structure.

4. The spherical prism optical axis deflection angle detection device according to claim 1, characterized in that, A CCD camera is installed at the right end of the photoelectric autocollimator.

5. The spherical prism optical axis deflection angle detection device according to claim 1, characterized in that, The platform is equipped with a three-jaw chuck.

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