Optical measuring device

Abstract

The utility model discloses an optical measuring device, the optical measuring device is used for carrying out eccentricity measurement on a product to be measured, the optical measuring device comprises a bearing support, and the bearing support is used for bearing the product to be measured; the device further comprises a light emitting and receiving mechanism, and the light emitting and receiving mechanism is arranged above the bearing support. The light emitting and receiving mechanism comprises a light source and a polarization assembly, and emergent light emitted by the light source can be converted into circularly polarized light under the action of the polarization assembly. By adopting the optical measurement device provided by the embodiment of the invention, eccentricity measurement can be carried out on the to-be-measured product with the folded light path, and the accuracy of the measurement result is relatively high.

Description

Technical Field

[0001] The present application relates to the field of optical measurement technology, and more particularly, to an optical measurement device. Background Art

[0002] In optical testing, it is often necessary to measure the reflected image of each surface of the optical lens in order to detect the eccentricity of the optical axis based on the position of the reflected image. For conventional products, there is usually only one reflected image on each surface; however, for some optical devices, such as the folded optical path (pancake) products in virtual reality devices, since the curvature radius of two adjacent surfaces is the same, or two adjacent surfaces are bonded together, multiple cross images may appear on the image plane during the measurement process, such as Figure 1' As shown in the figure, the presence of multiple cross images will significantly affect the results of eccentricity measurement, thereby greatly reducing the accuracy of the measurement.

[0003] In view of this, it is necessary to provide a new technical solution to solve the above technical problems. Utility Model Content

[0004] One purpose of the present application is to provide a new technical solution for an optical measuring device.

[0005] According to a first aspect of the present application, an optical measuring device is provided, wherein the optical measuring device is used to measure the eccentricity of a product to be measured, and the optical measuring device comprises:

[0006] A supporting bracket, the supporting bracket is used to support the product to be tested;

[0007] A light emitting and receiving mechanism, wherein the light emitting and receiving mechanism is arranged above the supporting bracket;

[0008] The light emitting and receiving mechanism includes a light source and a polarization component. The outgoing light emitted by the light source can be converted into circularly polarized light through the action of the polarization component.

[0009] Optionally, the light emitting and receiving mechanism further includes a condenser lens group, and the condenser lens group is arranged on a side of the polarization component away from the light source.

[0010] Optionally, the light emitting and receiving mechanism further includes a target component, and the target component is arranged on a side of the condenser lens assembly away from the light source.

[0011] Optionally, the polarization component includes a linear polarizer and a phase retarder, and along the light emitting direction of the light source, the light source, the linear polarizer and the phase retarder are arranged in sequence.

[0012] Optionally, the light emitting and receiving mechanism further includes a filter wheel, the polarization component is mounted on the filter wheel, and the filter wheel is provided with a first light-through hole; the polarization component and the first light-through hole can be rotated in the filter wheel to switch the positions of the polarization component and the first light-through hole so that the polarization component or the first light-through hole corresponds to the light source.

[0013] Optionally, the optical measuring device further includes a rotating platform, the supporting bracket is mounted on the rotating platform, and the rotating platform can rotate around a first direction.

[0014] Optionally, the optical measuring device further comprises a four-position adjustment platform, the four-position adjustment platform is mounted on the rotating platform, and the supporting bracket is mounted on the four-position adjustment platform; the four-position adjustment platform can translate along the second direction and the third direction, and the four-position adjustment platform can rotate around the second direction and the third direction; the first direction, the second direction and the third direction are perpendicular to each other.

[0015] Optionally, the optical measuring device further comprises a switching mechanism connected to the light emitting and receiving mechanism;

[0016] The switching mechanism is provided with a second light-through hole and at least one lens. The second light-through hole and any one of the lenses can be moved in the switching mechanism to switch the positions of the second light-through hole and the lens so that the second light-through hole or any one of the lenses corresponds to the light emitting and receiving mechanism.

[0017] Optionally, the optical measuring device further comprises a motion axis, the light emitting and receiving mechanism is mounted on the motion axis, and the motion axis can drive the light emitting and receiving mechanism to perform translational motion along the first direction.

[0018] Optionally, the light emitting and receiving mechanism further includes a photoelectric sensor.

[0019] The optical measuring device provided in the embodiment of the present application can realize eccentricity measurement of a product to be measured with a folded optical path, and the measurement result has high accuracy.

[0020] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0022] Figure 1' The figure shows the ghosting phenomenon that occurs during eccentricity measurement.

[0023] Figure 2' The following is a schematic diagram of the structure of the product to be tested. Figure 1 ;

[0024] Figure 3' The following is a schematic diagram of the structure of the product to be tested. Figure 2 ;

[0025] Figure 1 Shown is a schematic structural diagram of an optical measuring device of the present application;

[0026] Figure 2 Shown is a structural schematic diagram of a light emitting and receiving mechanism in an optical measuring device of the present application.

[0027] Description of reference numerals:

[0028] 11. Support frame; 12. Light emitting and receiving mechanism; 121. Light source; 122. Polarization assembly; 1221. Linear polarizer; 1222. Phase retarder; 123. Condenser lens assembly; 124. Target; 125. Filter wheel; 1250. First light aperture; 13. Rotating stage; 14. Four-position adjustment stage; 15. Switching mechanism; 150. Second light aperture; 151. Lens; 16. Motion axis;

[0029] 01, first lens; 02, second lens; 011, first surface; 021, second surface; 012, third surface; 022, fourth surface; 03, linear polarizing film; 04, semi-transparent and semi-reflective film; 05, quarter glass; 06, reflective polarizing film. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0031] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0033] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0034] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] Reference Figure 1 、 Figure 2 As shown, according to one embodiment of the present application, an optical measuring device is provided, which is used to perform eccentricity measurement on a product to be measured. The optical measuring device includes a supporting bracket 11 and a light emitting and receiving mechanism 12. The supporting bracket 11 is used to support the product to be measured to ensure the stability of the product to be measured during the measurement process; the light emitting and receiving mechanism 12 is arranged above the supporting bracket 11; the light emitting and receiving mechanism 12 includes a light source 121 and a polarization component 122. The outgoing light emitted by the light source 121 can be converted into circularly polarized light through the action of the polarization component 122.

[0036] The optical measuring device provided in the embodiment of the present application can realize eccentricity measurement of the product to be measured with a folded optical path; Figure 2' 、 Figure 3' The structure of a typical product under test with a folded optical path is shown. It includes a first lens 01 and a second lens 02. First lens 01 has a first surface 011 and a third surface 012, while second lens 02 has a second surface 021 and a fourth surface 022. First surface 011 and second surface 021 have the same curvature and are positioned adjacent to each other. Fourth surface 022 is provided with a transflective film 04, second surface 021 is provided with a quarter-glass 05, and first surface 011 is laminated with a linear polarizing film 03 and a reflective polarizing film 06. When light is incident from above second lens 02, it passes sequentially through transflective film 04, fourth surface 022, second lens 02, second surface 021, quarter-glass 05, reflective polarizing film 06, linear polarizing film 03, first surface 011, first lens 01, and third surface 012 before exiting. Due to the presence of multiple functional films, the light is folded once within this product under test. When measuring eccentricity, it is necessary to measure the reflected image of the sphere center of each surface. When measuring the first surface 011 of the first lens 01 and the second surface 021 of the second lens 02, since the two are adjacent and have the same surface curvature, the sphere centers of the two surfaces will be imaged at the same time during measurement. Since there is a certain angle deviation between the two surfaces, the following will appear: Figure 1' Double cross ghosting problem shown.

[0037] When using the optical measuring device provided in an embodiment of the present application for measurement, since the light emitting and receiving mechanism 12 of the optical measuring device includes a polarization component 122, when light is emitted from the light source 121 and then passes through the polarization component 122, circularly polarized light is generated. When the circularly polarized light is irradiated and received by the product under test, the presence of the reflective polarizing film 06 prevents the light from continuing to propagate after passing through the second lens 02. Therefore, only the light reflected from the second surface 021 can return and be received by the light emitting and receiving mechanism 12. As a result, the reflected light generated by the product under test only includes a reflected image of the second surface 021. Therefore, when using the optical measuring device provided in an embodiment of the present application for measurement, at least when performing decentration measurement on the second surface 021 of the second lens 02, the influence of the first surface 011 of the first lens 01, which is adjacent and has the same curvature, can be eliminated, thereby improving the accuracy and precision of the measurement results.

[0038] During measurement, it should be noted that when the product to be tested is placed on the supporting bracket 11 , the second lens 02 should be placed closer to the light emitting and receiving mechanism 12 than the first lens 01 .

[0039] Reference Figure 2 As shown, in one embodiment, the light emitting and receiving mechanism 12 further includes a condenser lens group 123 , and the condenser lens group 123 is disposed on a side of the polarization component 122 away from the light source 121 .

[0040] In this specific example, the condenser lens group 123 can focus the circularly polarized light processed by the polarization component 122 and direct it toward the product to be measured, thereby improving the accuracy and efficiency of the measurement.

[0041] Reference Figure 2 As shown, in one embodiment, the light emitting and receiving mechanism 12 further includes a target member 124 , and the target member 124 is disposed on a side of the condenser lens assembly 123 away from the light source 121 .

[0042] In this specific example, the circularly polarized light processed by the polarization component 122 is converged by the condenser lens group 123 to illuminate the target part 124; the target pattern on the target part 124 is, for example, a cross.

[0043] Reference Figure 2 As shown, in one embodiment, the polarization component 122 includes a linear polarizer 1221 and a phase retarder 1222 , and along the light emitting direction of the light source 121 , the light source 121 , the linear polarizer 1221 and the phase retarder 1222 are arranged in sequence.

[0044] In this specific example, the light emitted by the light source 121 is first converted into linearly polarized light by the linear polarizer 1221, and then becomes circularly polarized light after passing through the phase retarder 1222. Optionally, the phase retarder 1222 may be, for example, a quarter-glass plate.

[0045] Reference Figure 2 As shown, in one embodiment, the light emitting and receiving mechanism 12 further includes a filter wheel 125, the polarization component 122 is installed on the filter wheel 125, and the filter wheel 125 is provided with a first light-through hole 1250; the polarization component 122 and the first light-through hole 1250 can rotate in the filter wheel 125 to switch the positions of the polarization component 122 and the first light-through hole 1250, so that the polarization component 122 or the first light-through hole 1250 corresponds to the light source 121.

[0046] In this specific example, the positions of the polarization component 122 and the first light hole 1250 can be switched through the filter wheel 125, so that the polarization component 122 or the first light hole 1250 is located in the measurement system; when the first light hole 1250 is located in the measurement system, the eccentricity measurement of the first surface 011 of the first lens 01 can be performed.

[0047] Reference Figure 1 As shown, in one embodiment, the optical measuring device further includes a rotating platform 13 , the supporting bracket 11 is mounted on the rotating platform 13 , and the rotating platform 13 can rotate around a first direction.

[0048] In this specific example, the product to be measured is driven to rotate around a first direction by the rotating stage 13 , and the eccentricity of the second surface 021 of the second lens 02 is measured during the rotation, thereby further improving the measurement precision and accuracy.

[0049] Reference Figure 1 As shown, in one embodiment, the optical measuring device further includes a four-position adjustment platform 14, the four-position adjustment platform 14 is mounted on the rotating platform 13, and the supporting bracket 11 is mounted on the four-position adjustment platform 14; the four-position adjustment platform 14 can translate along the second direction and the third direction, and the four-position adjustment platform 14 can rotate around the second direction and the third direction; the first direction, the second direction and the third direction are perpendicular to each other.

[0050] In this specific example, through the action of the four-position adjustment table 14, the translation position and rotation position of the product to be tested can be adjusted along the second direction and the third direction, so as to adjust the optical axis of the product to be tested and the optical axis of the light emitting and receiving mechanism 12 to be consistent, thereby improving the measurement precision and accuracy.

[0051] Reference Figure 1 As shown, the first direction is Figure 1 The a direction in the second direction is Figure 1 The b direction in the third direction is Figure 1 The c direction in .

[0052] Reference Figure 1 As shown, in one embodiment, the optical measuring device further includes a switching mechanism 15, and the switching mechanism 15 is connected to the light emitting and receiving mechanism 12;

[0053] The switching mechanism 15 is provided with a second light-through hole 150 and at least one lens 151. The second light-through hole 150 and any one of the lenses 151 can be moved in the switching mechanism 15 to switch the positions of the second light-through hole 150 and the lens 151 so that the second light-through hole 150 or any one of the lenses 151 corresponds to the light emitting and receiving mechanism 12.

[0054] In this specific example, the positions of the second light hole 150 and the lens 151 can be switched by the switching mechanism 15 so that the second light hole 150 or any lens 151 is located in the measurement system to adapt to products with different parameters to be measured.

[0055] Reference Figure 1 As shown, in one embodiment, the optical measuring device further includes a motion shaft 16 , and the light emitting and receiving mechanism 12 is installed on the motion shaft 16 , and the motion shaft 16 can drive the light emitting and receiving mechanism 12 to translate along a first direction.

[0056] In this specific example, according to measurement requirements, the light emitting and receiving mechanism 12 can be translated along the first direction through the motion axis 16; for example, when measuring the first surface 011 of the first lens 01, the light emitting and receiving mechanism 12 is located at one position on the motion axis 16; when measuring the second surface 021 of the second lens 02, the light emitting and receiving mechanism 12 is located at another position on the motion axis 16.

[0057] Reference Figure 1 As shown, in one embodiment, the light emitting and receiving mechanism 12 further includes a photoelectric sensor.

[0058] In this specific example, the light emitting and receiving mechanism 12 is not only responsible for emitting the outgoing light, but also for receiving the reflected light; the light emitting and receiving mechanism 12 may be, for example, an autocollimator, which has high-precision light emitting and receiving capabilities.

[0059] The method for measuring using the optical measuring device provided in the embodiment of the present application includes:

[0060] S101, placing the product to be tested on the supporting bracket 11, and placing the second lens 02 closer to the light emitting and receiving mechanism 12 than the first lens 01;

[0061] S102, controlling the light emitting and receiving mechanism 12 to emit an outgoing light, the outgoing light is reflected by the product to be tested and generates a reflected light, and the reflected light is received by the light emitting and receiving mechanism 12;

[0062] S103 : Acquire a second reflected image of the second surface 021 according to the reflected light, and obtain a second eccentricity of the second surface 021 according to the second reflected image.

[0063] In the measurement method provided in this embodiment, in step S101, the product to be tested is placed on the supporting bracket 11 with the second lens 02 being closer to the light emitting and receiving mechanism 12;

[0064] In steps S102 and S103, the light source 121 of the light emitting and receiving mechanism 12 is turned on to emit outgoing light. The outgoing light first passes through the linear polarizer 1221 and then passes through the phase retarder 1222 to become circularly polarized light and is received by the product to be tested. Due to the presence of the reflective polarizing film 06, the light can no longer continue to propagate after passing through the second lens 02. Therefore, only the light reflected from the second surface 021 can return and be received by the light emitting and receiving mechanism 12. As a result, the reflected light generated by the reflection of the product to be tested only includes the reflection image of the second surface 021.

[0065] The light emitting and receiving mechanism 12 is not only responsible for emitting the outgoing light, but also for receiving the reflected light. The light emitting and receiving mechanism 12 may be, for example, an autocollimator.

[0066] The method for measuring using the optical measuring device provided in the embodiment of the present application also includes:

[0067] Switching the positions of the polarization component 122 and the first light-through hole 1250 in the filter wheel 125 so that the first light-through hole 1250 corresponds to the light source 121;

[0068] Controlling the light source 121 to emit outgoing light, the outgoing light being reflected by the product to be tested to generate reflected light, and the reflected light being received by the photoelectric sensor of the light emitting and receiving mechanism 12;

[0069] Acquire a total reflection image of the first surface 011 and the second surface 021 according to the reflected light;

[0070] A first reflected image of the first surface 011 is acquired according to the total reflected image and the second reflected image, and a first eccentricity of the first surface 011 is obtained according to the first reflected image.

[0071] In this specific example, the measurement objective is to measure the decentration of the first surface 011 of the first lens 01, thereby requiring the outgoing light to not only pass through the second lens 02 but also enter the first lens 01. Therefore, by adjusting the filter wheel 125, the first light hole 1250 and the polarization component 122 are swapped, so that the first light hole 1250 corresponds to the light source 121. As a result, the outgoing light emitted by the light source 121 does not pass through the polarization component 122, but instead passes through the first light hole 1250 and then enters the product to be measured. The outgoing light is reflected not only by the second surface 021, but also by the first surface 011. Therefore, the obtained reflected light is the total reflected image of the first surface 011 and the second surface 021. Combined with the second reflected image of the second surface 021, the first reflected image of the first surface 011 can be obtained. Based on this first reflected image, the first decentration of the first surface 011 can be obtained.

[0072] Furthermore, acquiring a first reflected image of the first surface 011 according to the total reflected image and the second reflected image includes:

[0073] The first reflected image is obtained by removing the second reflected image from the total reflected image.

[0074] In this specific example, the first reflected image is obtained by image processing; for example, the second reflected image is subjected to regional recognition to obtain the position of the second reflected image; the second reflected image is determined in the total reflected image according to the position of the second reflected image, and then the grayscale of the second reflected image is removed from the total reflected image to obtain a separate first reflected image.

[0075] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An optical measuring device, characterized in that: The optical measuring device is used to measure the eccentricity of the product to be measured, and the optical measuring device includes: A supporting bracket (11), the supporting bracket (11) is used to support the product to be tested; a light emitting and receiving mechanism (12), wherein the light emitting and receiving mechanism (12) is arranged above the supporting bracket (11); The light emitting and receiving mechanism (12) comprises a light source (121) and a polarization component (122), and the outgoing light emitted by the light source (121) can be converted into circularly polarized light through the action of the polarization component (122).

2. The optical measuring device according to claim 1, wherein The light emitting and receiving mechanism (12) further comprises a condenser lens group (123), and the condenser lens group (123) is arranged on a side of the polarization component (122) away from the light source (121).

3. The optical measuring device according to claim 2, wherein The light emitting and receiving mechanism (12) further comprises a target component (124), and the target component (124) is arranged on a side of the condenser lens group (123) away from the light source (121).

4. The optical measuring device according to claim 1, wherein The polarization component (122) comprises a linear polarizer (1221) and a phase retarder (1222); along the light emitting direction of the light source (121), the light source (121), the linear polarizer (1221) and the phase retarder (1222) are arranged in sequence.

5. The optical measuring device according to claim 1 or 4, characterized in that The light emitting and receiving mechanism (12) further comprises a filter wheel (125), the polarization component (122) is mounted on the filter wheel (125), and the filter wheel (125) is provided with a first light-through hole (1250); the polarization component (122) and the first light-through hole (1250) can be rotated in the filter wheel (125) to switch the positions of the polarization component (122) and the first light-through hole (1250), so that the polarization component (122) or the first light-through hole (1250) corresponds to the light source (121).

6. The optical measuring device according to claim 1, wherein The optical measuring device further comprises a rotating platform (13), the supporting bracket (11) is mounted on the rotating platform (13), and the rotating platform (13) is capable of rotating around a first direction.

7. The optical measuring device according to claim 6, characterized in that The optical measuring device further comprises a four-position adjustment platform (14), the four-position adjustment platform (14) being mounted on the rotating platform (13), and the supporting bracket (11) being mounted on the four-position adjustment platform (14); the four-position adjustment platform (14) being capable of translational movement along a second direction and a third direction, and being capable of rotation about the second direction and the third direction; and the first direction, the second direction and the third direction being perpendicular to each other.

8. The optical measuring device according to claim 1, wherein The optical measuring device further comprises a switching mechanism (15), wherein the switching mechanism (15) is connected to the light emitting and receiving mechanism (12); The switching mechanism (15) is provided with a second light-through hole (150) and at least one lens (151); the second light-through hole (150) and any one of the lenses (151) are movable in the switching mechanism (15) to switch the positions of the second light-through hole (150) and the lens (151), so that the second light-through hole (150) or any one of the lenses (151) corresponds to the light emitting and receiving mechanism (12).

9. The optical measuring device according to claim 1 or 8, characterized in that The optical measuring device further comprises a motion shaft (16), the light emitting and receiving mechanism (12) is mounted on the motion shaft (16), and the motion shaft (16) is capable of driving the light emitting and receiving mechanism (12) to perform translational motion along a first direction.

10. The optical measuring device according to claim 1, wherein The light emitting and receiving mechanism (12) also includes a photoelectric sensor.

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