Dual-viewing light tube, spherical center image measurement method, centering instrument and centering car

Abstract

The present application relates to a dual-view light tube, a method for measuring the spherical center image, a centering instrument and a centering vehicle. The dual-view light tube comprises: a light source assembly, a first imaging assembly, a beam splitter, a first imaging lens and a second imaging lens; wherein the beam splitter is used to split the light collimated by the first imaging assembly to obtain a first target sub-light and a second target sub-light, and transmit the first target sub-light to the first imaging lens, and reflect the second target sub-light to the second imaging lens; the light is provided by the light source assembly; the first imaging lens is used to converge the first target sub-light so that the first target sub-light is imaged on the camera; the second imaging lens is used to converge the second target sub-light so that the second target sub-light is imaged on the camera; the focal length of the first imaging lens is smaller than that of the second imaging lens. The use of the dual-view light tube can improve the efficiency of measuring the spherical center image of an optical element.

Description

Technical Field

[0001] The present application relates to the field of optical information technology, and in particular to a dual-field light pipe, a spherical center image measurement method, a centering instrument and a centering vehicle. Background Art

[0002] In centering instruments and centering machines, optical tubes are mainly used to measure the spherical center image of optical components. During the measurement process, the lens or lens group needs to be constantly adjusted so that the optical axis of the lens or lens group coincides with the mechanical axis of the metal lens seat to ensure the assembly accuracy of the optical system.

[0003] At present, when using a light tube to measure the spherical center image of an optical element, an electronic autocollimator with an interchangeable objective lens is mainly used for measurement. In order to increase the measurement accuracy and the resolution of the spherical center image, an electronic autocollimator with a longer focal length is used for measurement.

[0004] However, the longer the focal length of the electronic autocollimator used, the higher the pixel resolution and the smaller the field of view, which will make it impossible to quickly find the spherical center image, thereby resulting in low efficiency in measuring the spherical center image of the optical element. Summary of the invention

[0005] Based on this, it is necessary to provide a dual-view light tube, a spherical center image measurement method, a centering instrument and a centering vehicle to address the above technical problems.

[0006] In a first aspect, the present application provides a dual-viewing light pipe, the dual-viewing light pipe comprising: a light source assembly, a first imaging assembly, a beam splitter, a first imaging lens and a second imaging lens; wherein:

[0007] The beam splitter is used to split the light collimated by the first imaging component to obtain a first target sub-light and a second target sub-light, and transmit the first target sub-light to the first imaging lens, and reflect the second target sub-light to the second imaging lens; the light is provided by the light source component;

[0008] The first imaging lens is used to converge the first target sub-light to form an image on the camera;

[0009] The second imaging lens is used to converge the second target sub-light to form an image of the second target sub-light on the camera; the focal length of the first imaging lens is smaller than that of the second imaging lens.

[0010] In one embodiment, the light source assembly comprises:

[0011] A light source, used for providing multiple paths of light, one of the multiple paths of light reaching the first imaging component;

[0012] Cross target, used to provide imaging object.

[0013] In one embodiment, the first imaging component comprises:

[0014] A beam splitter prism, used for reflecting or transmitting a path of light so that the path of light reaches the positive lens;

[0015] The positive lens is used to collimate the light reflected or transmitted by the beam splitter prism;

[0016] The replaceable objective lens is used to converge the light beam so that the light beam reaches the optical element and transmit the light beam reflected by the optical element.

[0017] In one embodiment, the positive lens is an achromatic positive lens, and the achromatic positive lens comprises:

[0018] A first achromatic positive lens, used for collimating the light beam reflected by the beam splitter prism so that the light beam reaches the replaceable objective lens, and also used for transmitting the light beam reflected by the optical element;

[0019] The second achromatic positive lens is used for collimating the light beam transmitted by the beam splitter prism so that the light beam reaches the beam splitter.

[0020] In one embodiment, the focal points of the first achromatic positive lens and the second achromatic positive lens coincide with each other, and the cross target in the light source assembly is located at the focal plane of the first achromatic positive lens.

[0021] In one of the embodiments, the dual-viewing light pipe further includes a camera, and the camera includes a first camera and a second camera.

[0022] In one embodiment, the first imaging lens is specifically used to converge the first target sub-light transmitted by the beam splitter to the first camera, so that the first target sub-light is imaged on the first camera; the second imaging lens is specifically used to converge the second target sub-light reflected by the beam splitter to the second camera, so that the second target sub-light is imaged on the second camera.

[0023] In a second aspect, the present application further provides a spherical centroid image measurement method, which is applied to a dual-viewing light pipe, and the dual-viewing light pipe is the dual-viewing light pipe described in any of the above embodiments, and the spherical centroid image measurement method includes:

[0024] Splitting the light collimated by the first imaging component to obtain a first target sub-light and a second target sub-light, transmitting the first target sub-light to the first imaging lens, and reflecting the second target sub-light to the second imaging lens; the light is provided by the light source component;

[0025] Converging the first target sub-light beam to form an image on a camera;

[0026] The second target sub-light beam is converged to form an image on the camera; the focal length of the first imaging lens is smaller than that of the second imaging lens.

[0027] In a third aspect, the present application further provides a centering device, which includes the dual-viewing light pipe described in any one of the above embodiments.

[0028] In a fourth aspect, the present application further provides a centering vehicle, wherein the centering vehicle comprises the dual-viewing light pipe described in any one of the above embodiments.

[0029] The above-mentioned dual-view light tube, spherical center image measurement method, centering instrument and centering vehicle, the dual-view light tube includes: a light source assembly, a first imaging assembly, a beam splitter, a first imaging lens and a second imaging lens; wherein the beam splitter is used to split the light collimated by the first imaging assembly to obtain a first target sub-light and a second target sub-light, and transmit the first target sub-light to the first imaging lens, and reflect the second target sub-light to the second imaging lens; the light is provided by the light source assembly; the first imaging lens is used to converge the first target sub-light so that the first target sub-light is imaged on the camera; the second imaging lens is used to converge the second target sub-light so that the second target sub-light is imaged on the camera; the focal length of the first imaging lens is smaller than that of the second imaging lens. By using the dual-view light tube, the light collimated by the first imaging component is split by a beam splitter to obtain a first target sub-light and a second target sub-light, and the first target sub-light and the second target sub-light are imaged on the camera through a first imaging lens and a second imaging lens with different focal lengths, respectively, so that two images can be obtained at the same time, so that one image satisfies the high pixel resolution while forming another image with a larger view. The image with a larger view improves the speed of finding the image of the center of the sphere of the optical element, thereby improving the efficiency of measuring the image of the center of the sphere of the optical element. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] FIG1 is a schematic diagram of the structure of a dual-viewing light pipe in one embodiment;

[0032] FIG2 is a detailed structural diagram of a dual-viewing light pipe in one embodiment;

[0033] FIG3 is a schematic flow chart of a method for measuring a spherical center image in one embodiment;

[0034] FIG4 is a schematic diagram of the structure of a centering device in one embodiment;

[0035] FIG. 5 is a schematic structural diagram of a centering vehicle in one embodiment. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] It should be understood that the terms "first", "second", "third" and "fourth" in the specification and drawings are used to distinguish different objects rather than to describe a specific order. The terms "include" and "comprise" used in the specification and claims of this application indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0038] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and claims, unless the context clearly indicates otherwise, the singular forms of "a", "an" and "the" are intended to include plural forms. It should also be further understood that the term "and / or" used in this application specification and claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0039] As used in this specification and claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0040] In one embodiment, as shown in FIG. 1 , a dual-field-of-view light pipe 100 is provided, and the dual-field-of-view light pipe 100 includes: a light source assembly, a first imaging assembly, a beam splitter, a first imaging lens, and a second imaging lens; wherein the beam splitter is used to split the light collimated by the first imaging assembly to obtain a first target sub-light and a second target sub-light, and transmit the first target sub-light to the first imaging lens, and reflect the second target sub-light to the second imaging lens; the light is provided by the light source assembly; the first imaging lens is used to converge the first target sub-light to form an image on the camera; and the second imaging lens is used to converge the second target sub-light to form an image on the camera.

[0041] The focal length of the first imaging lens 130 is smaller than that of the second imaging lens 140. The beam splitter 120 is a 1:1 beam splitter, and the ratio of reflected light to transmitted light is 1:1.

[0042] In implementation, the dual-view light pipe 100 includes a first imaging assembly 110, a beam splitter 120, a first imaging lens 130, a second imaging lens 140, and a light source assembly 150. The beam splitter 120 is located at one side of the first imaging assembly 110. On the side where the beam splitter 120 exists, there is also the first imaging lens 130. The second imaging lens 140 is located below the beam splitter 120. Optical elements are located at the other side of the first imaging assembly 110. The light source assembly 150 is located below the first imaging assembly 110.

[0043] The light source assembly 150 is used to provide multiple paths of light, and one path of the multiple paths of light reaches the first imaging assembly 110. The first imaging assembly 110 is used to emit one path of light to the optical element to be measured. When the focus of the replaceable objective lens 113 in the first imaging assembly 110 coincides with the optical element, the path of light will be reflected to the first imaging assembly 110 along the original incident light path. The first imaging assembly 110 collimates the path of light reflected by the optical element, and outputs the collimated path of light to the spectroscope 120. The spectroscope 120 splits the path of light collimated by the first imaging assembly 110 to obtain a first target sub-light and a second target sub-light. The spectroscope 120 transmits the first target sub-light to the first imaging lens 130, and reflects the second target sub-light to the second imaging lens 140. The first imaging lens 130 converges the first target sub-light so that the first target sub-light is imaged on the camera. The second imaging lens 140 converges the second target sub-light so that the second target sub-light is imaged on the camera.

[0044] In the above dual-view light pipe, the light collimated by the first imaging component is split by a beam splitter to obtain a first target sub-light and a second target sub-light, and the first target sub-light and the second target sub-light are imaged on the camera through a first imaging lens and a second imaging lens with different focal lengths, respectively, so that two images can be obtained at the same time, so that one image satisfies a high pixel resolution while forming another image with a larger view. The image with a larger view improves the speed of finding the center image of the optical element, thereby improving the efficiency of measuring the center image of the optical element.

[0045] In an exemplary embodiment, the light source assembly includes a light source for providing multiple light paths, one of the multiple light paths reaches the first imaging assembly; and a cross target for providing an imaging object.

[0046] In implementation, the light source assembly 150 includes a light source 151 and a cross target 152. The light source 151 is a white LED (light-emitting diode) light source. The cross lines in the cross target 152 are transparent, and the rest of the cross target 152 is opaque. The cross target 152 is located below the beam splitter prism 111.

[0047] The light source 151 is used to provide multiple light paths and illuminate the cross target 152. One of the multiple light paths reaches the first imaging component 110 to provide light for subsequent imaging. The cross target 152 is an object imaged on the camera. By observing the cross target 152 imaged in the camera, the position of the spherical center image can be clearly determined.

[0048] Optionally, the light source 151 may be located below the cross target 152, or may be located to the left or right of the cross target 152. The position of the light source 151 in the embodiment of the present application is not limited.

[0049] In this embodiment, the light source in the light source assembly provides a light source for subsequent imaging, and the cross target in the light source assembly provides an object for subsequent imaging, so as to facilitate the subsequent determination of the position of the spherical center image.

[0050] In an exemplary embodiment, the first imaging component includes: a beam splitter prism, used to reflect or transmit a light ray so that the light ray reaches a positive lens; a positive lens, used to collimate a light ray reflected or transmitted by the beam splitter prism; and a replaceable objective lens, used to converge a light ray so that the light ray reaches an optical element and transmit a light ray reflected by the optical element.

[0051] The beam splitter prism is a 1:1 beam splitter prism, where 1:1 means that the ratio of reflected light to transmitted light is 1:1.

[0052] In implementation, the first imaging assembly 110 includes a beam splitter prism 111, a positive lens 112, and a replaceable objective lens 113. The positive lens 112 is an achromatic positive lens, and the achromatic positive lens includes a first achromatic positive lens 112a and a second achromatic positive lens 112b.

[0053] Starting from one side of the optical element to the other side of the beam splitter 120, the positions of the elements in the first imaging assembly 110 are respectively replaceable objective lens 113, first achromatic positive lens 112a, beam splitter prism 111 and second achromatic positive lens 112b.

[0054] The beam splitter 111 will reflect a light beam to the first achromatic positive lens 112a. The first achromatic positive lens 112a will collimate the light beam reflected by the beam splitter 111, and make the collimated light beam reach the replaceable objective lens 113. The replaceable objective lens 113 converges the collimated light beam, so that the light beam reaches the optical element. When the focus of the replaceable objective lens 113 coincides with the spherical center of the optical element, the light beam will be reflected along the original light path to reach the replaceable objective lens 113. The replaceable objective lens 113 transmits the light beam reflected by the optical element, so that the light beam returns to the first achromatic positive lens 112a along the original path. The first achromatic positive lens 112a will transmit a light beam, so that the light beam reaches the beam splitter 111. The beam splitter 111 transmits a light beam, so that the light beam reaches the second achromatic positive lens 112b. The second achromatic positive lens 112b collimates a light beam, so that the collimated light beam reaches the beam splitter 120.

[0055] In this embodiment, through the mutual combination of the various elements in the first imaging component, one light ray is emitted into the optical element to be measured, which provides a basis for the imaging of the optical element, and collimates one light ray reflected by the optical element, so that the collimated light ray reaches the beam splitter, which is convenient for subsequent imaging of one light ray and further positioning of the spherical center image of the optical element.

[0056] In an exemplary embodiment, the positive lens is an achromatic positive lens, which includes: a first achromatic positive lens, used to collimate a light ray reflected by a beam splitter prism so that the light ray reaches the replaceable objective lens, and also used to transmit a light ray reflected by the optical element; a second achromatic positive lens, used to collimate a light ray transmitted by the beam splitter prism so that the light ray reaches the beam splitter.

[0057] In implementation, the positive lens 112 is an achromatic positive lens. The achromatic positive lens 112 includes: a first achromatic positive lens 112a and a second achromatic positive lens 112b. The first achromatic positive lens 112a and the second achromatic positive lens 112b are respectively located on both sides of the beam splitter prism 111. The focal length of the first achromatic positive lens 112a is , the focal length of the second achromatic positive lens 112b is .

[0058] The first achromatic positive lens 112a receives a light beam reflected by the beam splitter prism 111, and collimates the light beam so that the light beams reach the replaceable objective lens 113 in parallel. The replaceable objective lens 113 converges the collimated light beam so that the light beam reaches the optical element. When the focus of the replaceable objective lens 113 coincides with the spherical center of the optical element, the light beam will be reflected along the original optical path and reach the replaceable objective lens 113. The replaceable objective lens 113 transmits the light beam reflected by the optical element so that the light beam returns to the first achromatic positive lens 112a along the original path. The first achromatic positive lens 112a also transmits the light beam reflected by the optical element so that the light beam reaches the beam splitter prism 111. The beam splitter prism 111 transmits the light beam so that the light beam reaches the second achromatic positive lens 112b. The second achromatic positive lens 112b collimates the light beam transmitted by the beam splitter prism 111 so that the light beam reaches the beam splitter 120.

[0059] In this embodiment, the achromatic positive lens can be used to correct the light of different wavelengths in one light path when passing through the achromatic positive lens, so that the light path is focused at the same position, thereby improving the imaging quality. In addition, the achromatic positive lens is used to collimate one light path, so that the collimated light path reaches the beam splitter, which is convenient for subsequent imaging of the light path, and then positioning the spherical center image of the optical element.

[0060] In an exemplary embodiment, the focal points of the first achromatic positive lens and the second achromatic positive lens coincide with each other, and the cross target in the light source assembly is located at the focal plane of the first achromatic positive lens.

[0061] In implementation, the focus of the first achromatic positive lens 112a coincides with the focus of the second achromatic positive lens 112b. The cross target 152 in the light source assembly 150 is located at the focal plane of the first achromatic positive lens 112a. The focal plane, also known as the front focal plane or the object focal plane, refers to a plane where light rays converge after passing through the positive lens, and the plane is perpendicular to the optical axis of the positive lens. Under ideal conditions, only light rays parallel to the optical axis converge on the focal plane after the positive lens. The first achromatic positive lens 112a, the second achromatic positive lens 112b, the interchangeable objective lens 113 and the first imaging lens 130 are parallel to each other.

[0062] In this embodiment, the cross target is set on the focal plane of the first achromatic positive lens, which ensures that the first achromatic positive lens collimates one light ray, and the focal points of the first achromatic positive lens and the second achromatic positive lens coincide, which ensures that the transmission path of one light ray can pass through the first achromatic positive lens and the second achromatic positive lens at the same time and be output to the spectroscope in parallel.

[0063] In an exemplary embodiment, the dual-viewing light pipe further includes a camera, and the camera includes a first camera and a second camera.

[0064] In implementation, the dual-view light pipe 100 further includes a camera 160. The camera 160 is a CMOS (Complementary Metal-Oxide-Semiconductor) camera, which is a camera device using a CMOS image sensor. The camera 160 includes a first camera 161 and a second camera 162. The target surface diameter of the first camera 161 is A×B, and the pixel size of the second camera 162 is d.

[0065] In this embodiment, one light ray is imaged by the first camera, and one light ray is imaged by the second camera, so as to facilitate the subsequent positioning of the sphere center image according to the images of the two cameras.

[0066] In an exemplary embodiment, the first imaging lens is specifically used to converge the first target sub-light transmitted by the beam splitter to the first camera, so that the first target sub-light is imaged on the first camera; the second imaging lens is specifically used to converge the second target sub-light reflected by the beam splitter to the second camera, so that the second target sub-light is imaged on the second camera.

[0067] The first imaging lens 130 has a focal length of Infinite conjugate achromatic imaging lens. The second imaging lens 140 has a focal length of Infinite conjugate achromatic imaging lens. Infinite conjugate achromatic imaging lens is a specially designed optical lens used to reduce or eliminate chromatic aberration. Chromatic aberration refers to the dispersion phenomenon caused by the different focusing positions of light of different wavelengths in the lens due to the different relationship between refractive index and wavelength. Infinite conjugate achromatic imaging lens reduces the influence of chromatic aberration through special lens combination and design. Generally speaking, it consists of at least two lenses, some of which are positive lenses and some are negative lenses. Such a design can effectively focus light of different wavelengths onto the same plane, thereby reducing chromatic aberration.

[0068] In implementation, the first imaging lens 130 converges one path of the first target sub-light transmitted by the beam splitter 120 to the first camera 161, so that one path of the first target sub-light is imaged on the first camera 161. Because the focal length of the first imaging lens 130 is smaller than that of the second imaging lens 140, the field of view of the image formed on the first camera 161 is larger than the field of view of the image formed on the second camera 162, that is, the field of view of the image formed on the first camera 161 is the maximum field of view of the image formed by the dual-field light pipe 100. The maximum field of view of the image formed on the first camera 161 is determined based on the target diameter of the first camera 161, the focal length of the first imaging lens 130, the focal length of the first achromatic positive lens 112a, and the focal length of the second achromatic positive lens 112b.

[0069] Specifically, the target diameter of the first camera 161, the focal length of the first imaging lens 130, the focal length of the first achromatic positive lens 112a, and the second achromatic positive lens 112b are processed according to the first viewing algorithm to obtain the maximum viewing area of ​​the dual-view light pipe 100 in the x direction, and the target diameter of the first camera 161, the focal length of the first imaging lens 130, the focal length of the first achromatic positive lens 112a, and the second achromatic positive lens 112b are processed according to the second viewing algorithm to obtain the maximum viewing area of ​​the dual-view light pipe 100 in the y direction. The first viewing algorithm is shown in the following formula (1):

[0070] (1)

[0071] In the above formula (1), is the maximum field of view of the dual-viewing light pipe 100 in the x direction, is the target surface diameter of the first camera 161 in the x direction. is the focal length of the first achromatic positive lens 112a. is the focal length of the second achromatic positive lens 112b. is the focal length of the first imaging lens 130 .

[0072] The second view algorithm is shown in the following formula (2):

[0073] (2)

[0074] In the above formula (2), is the maximum field of view of the dual-viewing light pipe 100 in the y direction, is the target surface diameter of the first camera 161 in the y direction. is the focal length of the first achromatic positive lens 112a. is the focal length of the second achromatic positive lens 112b. is the focal length of the first imaging lens 130 .

[0075] The second imaging lens 140 converges one path of the second target sub-light reflected by the beam splitter 120 to the second camera 162, so that one path of the second target sub-light is imaged on the second camera 162. Since the focal length of the second imaging lens 140 is greater than that of the first imaging lens 130, the pixel resolution of the image formed on the second camera 162 is higher than the pixel resolution of the image formed on the first camera 161, that is, the pixel resolution of the image formed on the second camera 162 is the highest pixel resolution of the image formed by the dual-view light pipe 100. The pixel resolution of the image formed on the second camera 162 is determined based on the pixel size of the second camera 162, the focal length of the second imaging lens 140, the focal length of the first achromatic positive lens 112a, and the focal length of the second achromatic positive lens 112b.

[0076] Specifically, the pixel size of the second camera 162, the focal length of the second imaging lens 140, the focal length of the first achromatic positive lens 112a, and the focal length of the second achromatic positive lens 112b are processed according to the first resolution algorithm to obtain the highest single pixel resolution of the dual-view light pipe 100. The first resolution algorithm is shown in the following formula (3):

[0077] (3)

[0078] In the above formula (3), The highest single pixel resolution for dual-view light pipe 100. is the pixel size of the second camera 162 . is the focal length of the first achromatic positive lens 112a. is the focal length of the second achromatic positive lens 112b. is the focal length of the second imaging lens 140 .

[0079] In this embodiment, the first target sub-light is converged by a first imaging lens with a shorter focal length, so that the first target sub-light is imaged on the first camera, and an image with a larger field of view is obtained, and the maximum field of view can reach several degrees, thereby improving the speed of finding the image of the center of the sphere of the optical element, and thus improving the efficiency of measuring the image of the center of the sphere of the optical element. In addition, the second target sub-light is converged by a second imaging lens with a longer focal length, so that the second target sub-light is imaged on the second camera, and a high-resolution image is obtained, and the highest resolution can reach the micro-arc level, thereby improving the imaging quality and clarity.

[0080] In an exemplary embodiment, as shown in FIG. 2 , a detailed structural diagram of the dual-view light pipe 100 is provided. The dual-view light pipe 100 includes an optical element to be measured, a replaceable objective lens 113, and a focal length of Achromatic positive lens 112a, 1:1 beam splitter prism 111, cross target 152, white light LED light source 151, focal length Achromatic positive lens 112b, 1:1 beam splitter 120, focal length Infinite conjugate achromatic imaging lens 130, COMS camera 161, focal length Infinite conjugate achromatic imaging lens 140 and COMS camera 162.

[0081] The optical element includes a spherical center 210 of the optical element and a surface 220 of the optical element. The focal length of the infinite conjugate achromatic imaging lens 140 is greater than that of the infinite conjugate achromatic imaging lens 130. The crosshairs in the cross target 152 are transparent, and the rest of the cross target 152 is opaque, and the cross target 152 is located in the focal plane of the achromatic positive lens 112a. The target surface diameter of the COMS camera 161 is A×B. The pixel size of the COMS camera 162 is d. The interchangeable objective lens 113, the achromatic positive lens 112a, the beam splitter 111, the cross target 152, the white light LED light source 151, the achromatic positive lens 112b, the beam splitter 120, the infinite conjugate achromatic imaging lens 130, the COMS camera 161, the infinite conjugate achromatic imaging lens 140 and the COMS camera 162 constitute a long-short focal dual-path imaging system 300.

[0082] In implementation, when the long-short focal length dual-path imaging system 300 is working, the white light LED light source 151 will illuminate the cross target 152, providing a light source for the imaging of the cross target 152. Among them, one of the multiple light rays reaches the beam splitter prism 111. The beam splitter prism 111 reflects one ray of light to the achromatic positive lens 112a. The achromatic positive lens 112a collimates the one ray of light reflected by the beam splitter prism 111, and outputs the collimated one ray of light to the replaceable objective lens 113. After the replaceable objective lens 113 converges one ray of light, one ray of light is incident on the surface 220 of the optical element to be measured. When the focus of the replaceable objective lens 113 coincides with the center 210 of the spherical surface of the optical element, one ray of light is reflected along the original light path, and is transmitted through the replaceable objective lens 113, the achromatic positive lens 112a and the beam splitter prism 111 respectively. Then, one ray of light is incident on the achromatic positive lens 112b. The focal points of the achromatic positive lens 112a and the achromatic positive lens 112b overlap, and one light beam will be collimated by the achromatic positive lens 112b to form a mutually parallel light beam, and enter the spectroscope 120. The spectroscope 120 splits the light beam to obtain a first target sub-light beam and a second target sub-light beam. The spectroscope 120 transmits the first target sub-light beam to the infinite conjugate achromatic imaging lens 130, and reflects the second target sub-light beam to the infinite conjugate achromatic imaging lens 140. The infinite conjugate achromatic imaging lens 130 converges the first target sub-light beam, so that the first target sub-light beam is imaged on the COMS camera 161. The infinite conjugate achromatic imaging lens 140 converges the second target sub-light beam, so that the second target sub-light beam is imaged on the COMS camera 162.

[0083] The maximum field of view of the image of the long-short focal length dual-path imaging system 300 is calculated based on the first field of view algorithm and the second field of view algorithm by calculating the target diameter of the COMS camera 161, the focal length of the infinite conjugate achromatic imaging lens 130, the focal length of the achromatic positive lens 112a, and the focal length of the achromatic positive lens 112b. The highest pixel resolution of the image of the long-short focal length dual-path imaging system 300 is calculated based on the first resolution algorithm by calculating the pixel size of the COMS camera 162, the focal length of the infinite conjugate achromatic imaging lens 140, the focal length of the achromatic positive lens 112a, and the focal length of the achromatic positive lens 112b.

[0084] For example, the curvature radius of the surface 220 of the optical element is 10 mm (millimeter), and the focal length of the interchangeable objective lens 113 is 50 mm. The focal length of the achromatic positive lens 112a is , f1 is 200mm. The focal length of the achromatic positive lens 112b is , is 100 mm. The focal length of the infinite conjugate achromatic imaging lens 130 is , The target diameter of the COMS camera 161 is 6.2 mm × 3.3 mm. The focal length of the infinite conjugate achromatic imaging lens 140 is , is 500 mm. The pixel size of the COMS camera 162 is d, and d is 3.2 microns. Then the calculation process of the maximum field of view of the long-short focal dual-path imaging system 300 in the x direction is shown in the following formula (4):

[0085] (4)

[0086] In the above formula (4), is the maximum field of view of the long- and short-focus dual-path imaging system 300 in the x direction, which is 0.062 radians, or 3.55 degrees. is the target surface diameter of COMS camera 161. is the focal length of the achromatic positive lens 112a. is the focal length of the achromatic positive lens 112b. is the focal length of the infinite conjugate achromatic imaging lens 130. The calculation process of the maximum field of view of the long-short focal dual-path imaging system 300 in the y direction is shown in the following formula (5):

[0087] (5)

[0088] In the above formula (5), is the maximum field of view of the long- and short-focus dual-path imaging system 300 in the y direction, which is 0.33 radians, or 1.89 degrees. is the target surface diameter of COMS camera 161. is the focal length of the achromatic positive lens 112a. is the focal length of the achromatic positive lens 112b. is the focal length of the infinite conjugate achromatic imaging lens 130 .

[0089] The calculation process of the highest single pixel resolution of the long-short focal length dual-path imaging system 300 is shown in the following formula (6):

[0090] (6)

[0091] In the above formula (5), This is the highest single pixel resolution of the long- and short-focus dual-path imaging system 300, which is 3.2 microradians. is the pixel size of the COMS camera 162. is the focal length of the achromatic positive lens 112a. is the focal length of the achromatic positive lens 112b. is the focal length of the infinite conjugate achromatic imaging lens 140 .

[0092] The present application provides a dual-field light pipe, which works in the visible light band and is illuminated by a white light source. Through a long- and short-focus dual-path imaging system, a self-collimating optical path is shared to achieve dual-field detection of the center of a spherical optical element. By selecting the focal length of the achromatic positive lens and the focal length of the wireless conjugate imaging lens, the maximum working field can reach several degrees, and the maximum resolution can reach the micro-arc level, so that the high-precision measurement of the center image of the sphere can be achieved while quickly locating the center image of the sphere in a large field of view.

[0093] In particular, it should be noted that any component in the dual-viewing-zone light pipe 100 may be a complete component or may be a combination of multiple sub-components, which is not limited in the present application.

[0094] In an exemplary embodiment, a spherical center image measurement method is provided. The spherical center image measurement method can be applied to the dual-viewing light pipe 100 in the above embodiment. As shown in FIG3 , the spherical center image measurement method includes:

[0095] Step 302, splitting the light collimated by the first imaging component to obtain a first target sub-light and a second target sub-light, transmitting the first target sub-light to the first imaging lens, and reflecting the second target sub-light to the second imaging lens.

[0096] The light is provided by a light source component.

[0097] In implementation, the light source assembly 150 in the dual-field light pipe 100 provides light, wherein one path of light reaches the first imaging assembly 110. The first imaging assembly 110 emits one path of light to the surface of the optical element being measured. When the focus of the replaceable objective lens 113 in the first imaging assembly 110 coincides with the center of the sphere of the optical element, one path of light will be emitted by the surface of the optical element and return to the first imaging assembly 110 along the original path. The first imaging assembly 110 collimates one path of light reflected by the optical element and outputs the collimated one path of light to the spectroscope 120. The spectroscope 120 splits the one path of light collimated by the first imaging assembly 110 to obtain a first target sub-light and a second target sub-light. The spectroscope 120 transmits the first target sub-light to the first imaging lens 130, and reflects the second target sub-light to the second imaging lens 140.

[0098] Step 304 , converge the first target sub-light beam to form an image on the camera.

[0099] In implementation, the first imaging lens 130 in the dual-viewing light pipe 100 converges the first target sub-light beam, so that the first target sub-light beam is imaged on the first camera 161 in the camera.

[0100] Step 306 , converge the second target sub-light beam to form an image on the camera.

[0101] Wherein, the focal length of the first imaging lens is smaller than that of the second imaging lens.

[0102] In implementation, the second imaging lens 140 in the dual-view light pipe 100 converges the second target sub-light, so that the second sub-light is imaged on the second camera 162. Since the focal length of the first imaging lens 130 is smaller than that of the second imaging lens 140, the viewing distance of the image on the first camera 161 is greater than that of the image on the second camera 162, and the pixel resolution of the image on the first camera 161 is higher than that of the image on the second camera 162.

[0103] In this embodiment, by splitting the light after the collimation of the first imaging component, a first target sub-light and a second target sub-light are obtained, and the first target sub-light and the second target sub-light are imaged on the camera through a first imaging lens and a second imaging lens with different focal lengths, respectively, so that two images can be obtained at the same time, so that one image satisfies the high pixel resolution while forming another image with a larger field of view. The image with a larger field of view improves the speed of finding the center image of the optical element, thereby improving the efficiency of measuring the center image of the optical element.

[0104] In an exemplary embodiment, as shown in FIG4 , a centering device 400 is provided. The centering device 400 includes a dual-viewing light pipe 410 of any of the above embodiments. The centering device 400 also includes a guide rail 420, a test piece 430, and an air-floating rotating table 440. The test piece 430 is located on the air-floating rotating table 440, and the dual-viewing light pipe 410 is installed beside the guide rail 420.

[0105] In an exemplary embodiment, as shown in FIG5 , a centering lathe 500 is provided. The centering lathe 500 comprises a dual-view light pipe 510 of any one of the above embodiments, a lathe 520, a clamping plate 530 and a workpiece 540. The clamping plate 530 is mounted on the lathe 520, and the workpiece 540 is mounted on the clamping plate 530. The center of the dual-view light pipe 510 coincides with the lathe spindle of the lathe 520.

[0106] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0107] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0108] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

[0109] Each embodiment in this application is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0110] The method and system of the present application may be implemented in many ways. For example, the method and system of the present application may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of steps for the method is for illustration only, and the steps of the method of the present application are not limited to the order specifically described above, unless otherwise specifically stated. In addition, in some embodiments, the present application may also be implemented as a program recorded in a recording medium, which includes machine-readable instructions for implementing the method according to the present application. Therefore, the present application also covers a recording medium storing a program for executing the method according to the present application.

[0111] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present application, and to enable those of ordinary skill in the art to understand the present application and thus design various embodiments with various modifications suitable for specific purposes.

Claims

1. A dual-viewing light pipe, characterized in that: The dual-view light pipe comprises: a light source assembly, a first imaging assembly, a beam splitter, a first imaging lens and a second imaging lens; wherein, The first imaging component is used to emit a path of light to the optical element to be measured; when the focus of the replaceable objective lens in the first imaging component coincides with the spherical center of the optical element, the path of light will be reflected to the first imaging component along the original incident light path; the first imaging component collimates the path of light reflected by the optical element, and outputs the collimated path of light to the beam splitter; The first imaging assembly includes a beam splitter prism, a positive lens and the replaceable objective lens; the positive lens is an achromatic positive lens, and the achromatic positive lens includes a first achromatic positive lens and a second achromatic positive lens; starting from one side of the optical element to the other side of the beam splitter, the position order of each element in the first imaging assembly is the replaceable objective lens, the first achromatic positive lens, the beam splitter prism and the second achromatic positive lens; the beam splitter prism is used to reflect a path of light provided by the light source assembly to the first achromatic positive lens; The beam splitter is used to split the light collimated by the first imaging component to obtain a first target sub-light and a second target sub-light, and transmit the first target sub-light to the first imaging lens, and reflect the second target sub-light to the second imaging lens; the light is provided by the light source component; The first imaging lens is used to converge the first target sub-light to form an image on the camera; The second imaging lens is used to converge the second target sub-light so that the second target sub-light is imaged on the camera; the focal length of the first imaging lens is smaller than that of the second imaging lens; the camera comprises a first camera and a second camera, the field of view of the image formed on the first camera is the maximum field of view of the image formed by the dual-field light pipe; the maximum field of view of the dual-field light pipe in the x direction is The maximum field of view of the dual-viewing light pipe in the y direction is Among them, θ x is the maximum field of view of the dual-field light pipe in the x direction, A is the target diameter of the first camera in the x direction, f1 is the focal length of the first achromatic positive lens, f2 is the focal length of the second achromatic positive lens, and f3 is the focal length of the first imaging lens; θ y is the maximum field of view of the dual-field light pipe in the y direction, and B is the target diameter of the first camera in the y direction.

2. The dual-viewing light pipe according to claim 1, characterized in that: The light source assembly comprises: A light source, used for providing multiple paths of light, one of the multiple paths of light reaching the first imaging component; Cross target, used to provide imaging object.

3. The dual-viewing light pipe according to claim 1, characterized in that: The beam splitter prism is used to reflect or transmit a path of light so that the path of light reaches the positive lens; The positive lens is used to collimate the light reflected or transmitted by the beam splitter prism; The replaceable objective lens is used to converge the light beam so that the light beam reaches the optical element and transmit the light beam reflected by the optical element.

4. The dual-viewing light pipe according to claim 3, characterized in that: The first achromatic positive lens is used to collimate the light reflected by the beam splitter prism so that the light reaches the replaceable objective lens, and is also used to transmit the light reflected by the optical element; The second achromatic positive lens is used for collimating the light beam transmitted by the beam splitter prism so that the light beam reaches the beam splitter.

5. The dual-viewing light pipe according to claim 4, characterized in that: The focal points of the first achromatic positive lens and the second achromatic positive lens coincide with each other, and the cross target in the light source assembly is located at the focal plane of the first achromatic positive lens.

6. The dual-viewing light pipe according to claim 1, characterized in that: The dual-viewing light pipe further includes a camera, wherein the camera includes a first camera and a second camera.

7. The dual-viewing light pipe according to claim 6, characterized in that: The first imaging lens is specifically used to converge the first target sub-light transmitted by the beam splitter to the first camera, so that the first target sub-light is imaged on the first camera; the second imaging lens is specifically used to converge the second target sub-light reflected by the beam splitter to the second camera, so that the second target sub-light is imaged on the second camera.

8. A method for measuring a spherical center image, characterized in that: The spherical center image measurement method is applied to a dual-viewing light pipe, the dual-viewing light pipe is the dual-viewing light pipe according to any one of claims 1 to 7, and the spherical center image measurement method comprises: The light beam is emitted to the optical element to be measured, and the light beam reflected by the optical element is collimated; when the focus of the replaceable objective lens in the first imaging component coincides with the spherical center of the optical element, the light beam is reflected along the original incident light path to the first imaging component; Outputting the collimated light to the beam splitter; The light collimated by the first imaging component is split to obtain a first target sub-light and a second target sub-light, and the first target sub-light is transmitted to the first imaging lens, and the second target sub-light is reflected to the second imaging lens; the light is provided by the light source component; the first imaging component includes a beam splitter prism, the positive lens and the replaceable objective lens; the positive lens is an achromatic positive lens, and the achromatic positive lens includes a first achromatic positive lens and a second achromatic positive lens; starting from one side of the optical element to the other side of the beam splitter, the position order of each element in the first imaging component is the replaceable objective lens, the first achromatic positive lens, the beam splitter prism and the second achromatic positive lens; the beam splitter prism is used to reflect one path of light provided by the light source component to the first achromatic positive lens; Converging the first target sub-light beam to form an image on a camera; The second target sub-light beam is converged to form an image on the camera; the focal length of the first imaging lens is smaller than that of the second imaging lens; the camera comprises a first camera and a second camera, the field of view of the image formed on the first camera is the maximum field of view of the image formed by the dual-field light pipe; the maximum field of view of the dual-field light pipe in the x direction is The maximum field of view of the dual-viewing light pipe in the y direction is Among them, θ x is the maximum field of view of the dual-field light pipe in the x direction, A is the target diameter of the first camera in the x direction, f1 is the focal length of the first achromatic positive lens, f2 is the focal length of the second achromatic positive lens, and f3 is the focal length of the first imaging lens; θ y is the maximum field of view of the dual-field light pipe in the y direction, and B is the target diameter of the first camera in the y direction.

9. A centering device, characterized in that: The centering device comprises the dual-viewing light pipe according to any one of claims 1 to 7.

10. A centering machine, characterized in that: The centering vehicle comprises the dual-viewing light pipe according to any one of claims 1 to 7.

Images