CN110514411B

CN110514411B - Lens refractive index detection device and method

Info

Publication number: CN110514411B
Application number: CN201910851360.5A
Authority: CN
Inventors: 刘义兵; 孙昭; 刘力威
Original assignee: Ningbo Flo Optical Co ltd
Current assignee: Ningbo Flo Optical Co ltd
Priority date: 2019-09-10
Filing date: 2019-09-10
Publication date: 2024-02-02
Anticipated expiration: 2039-09-10
Also published as: CN110514411A

Abstract

The utility model provides a lens refracting index detection device which characterized in that: the device comprises a light source module, a lens center physical thickness detection module and a lens center optical thickness detection module, wherein the light source module comprises a first light source component and a first focusing component, the first light source component is used for outputting collimated light beams, the lens center physical thickness detection module comprises a first imaging component and a second imaging component, and the lens center optical thickness detection module comprises a first photoelectric detection component, a second photoelectric detection component, a beam splitting component, a partially-reflected first reflecting mirror and a movable second reflecting mirror. The lens refractive index detection device is simple to operate, can perform online rapid nondestructive detection, and is also suitable for irregular surface type lenses such as aspheric lenses and cylindrical lenses and finished lenses. In addition, a method for detecting the refractive index of the lens is also provided.

Description

Lens refractive index detection device and method

Technical Field

The invention relates to the technical field of optical lens parameter detection, in particular to a lens refractive index detection device and method.

Background

The refractive index parameter is an important parameter index of the optical lens, and in order to ensure good imaging quality of the optical system, it is necessary to accurately measure the refractive index of the optical material. The refractive index of the optical glass material is detected by a minimum deflection angle method at present, but the premise of the detection by the minimum deflection angle method is that the optical glass to be detected needs to be manufactured into a triple prism to carry out light refraction, and meanwhile, the related angle of the triple prism needs to be accurately detected. Therefore, the method for detecting the refractive index of the optical glass material by the minimum deflection angle method is a direct detection mode, and has the following technical problems: 1. the need to destroy the optical elements, which is necessarily not suitable for the detection of finished lenses; 2. the prism is difficult to manufacture, the period is long, corresponding prisms are required to be manufactured for optical glass of different batches and different materials, and the detection efficiency is low; 3. since the test is performed using a triangular prism, the test is not suitable for detecting an irregular surface type lens such as an aspherical lens or a cylindrical lens. The minimum deviation angle method is suitable for detecting raw material glass in the same batch by glass manufacturers, but is not suitable for detecting the refractive index of finished lenses in an online high-precision manner, such as detecting the refractive index of the ophthalmic lenses, and the refractive index of the ophthalmic lenses needs to be detected without knowing the material of the optical elements and without damaging the optical elements, so that the material properties of the ophthalmic lenses are determined.

The existing refractive index detection methods for finished lenses mainly comprise 2 types: one is to calculate reversely according to the focal power formula, namely, measure its front and back surface curvature, center thickness and lens focal power by mechanical precision measurement method, calculate its wavelength refractive index according to the focal power formula, the method is complex in operation, difficult to guarantee the measurement accuracy, and is not suitable for the aspheric lens to measure; another method is to change the refractive index of the lens by changing the refractive index of the medium in contact with the front and rear surfaces of the lens, for example, placing the lens in a solution with a known refractive index, or attaching a flexible medium with a known refractive index to the front and rear surfaces of the lens, respectively detecting the refractive power of the lens in air and in the solution, and calculating the refractive index of the lens according to the change of the refractive power and the refractive index of the solution.

Disclosure of Invention

The first technical problem to be solved by the invention is: the lens refractive index detection device is simple to operate, capable of conducting on-line rapid nondestructive detection, and applicable to irregular surface lenses such as aspheric lenses and cylindrical lenses and finished lenses.

The technical solution of the invention for the first technical problem is: the utility model provides a lens refracting index detection device which characterized in that: the system comprises a light source module, a lens center physical thickness detection module and a lens center optical thickness detection module, wherein the light source module comprises a first light source component and a first focusing component, the first light source component is used for outputting collimated light beams, the lens center physical thickness detection module comprises a first imaging component and a second imaging component, the lens center optical thickness detection module comprises a first photoelectric detection component, a second photoelectric detection component, a beam splitting component, a first reflecting mirror which is partially reflected and a movable second reflecting mirror, the second photoelectric detection component, the first reflecting mirror, the beam splitting component, the first focusing component and the first light source component are sequentially arranged from front to back along a first optical axis direction, the movable second reflecting mirror is arranged on one side of the beam splitting component, the first photoelectric detection component is arranged on the other side of the beam splitting component, the focal plane of the first focusing component is positioned between the beam splitting component and the first reflecting mirror and is used for placing a lens to be detected, the first imaging component and the second imaging component are respectively arranged above and below the lens to be detected, the first light source component transmits collimated light beams along the first optical axis direction to the first optical axis direction, the first focusing component passes through the first reflecting component and the second component, the first light beam is further transmitted to the first light beam is reflected along the first component and the first component, the first light beam is further transmitted to the first light component passes through the first imaging component, and the first light component passes through the first reflecting component, and the first imaging component passes through the first reflecting component, and the first focusing component is further light component, and the first light component is reflected light component and light beam is reflected, the other beam is projected onto the first reflecting mirror and reflected by the first reflecting mirror to return in the original path, and is also reflected into the first photoelectric detection assembly through the beam splitting assembly, and the two returned beams enter the first photoelectric detection assembly for detecting interference phenomena.

The working principle of the technical scheme is as follows:

before the lens to be measured is placed, a first light source component is turned on, a collimated light beam emitted by the first light source component is focused by a first focusing component and is transmitted out by a first reflecting mirror part and is projected into a second photoelectric detection component, and the second photoelectric detection component monitors the spot center position of the projected light beam and is used as a reference position for adjusting the position of the subsequent lens to be measured; the measured lens is put in, the actual spot center position of the projected light beam is monitored by the second photoelectric detection component and is compared with the reference position obtained before, the position of the measured lens is guided to be adjusted by a user according to the deviation of the actual spot center position and the reference position, and when the actual spot center position is coincident with the reference position, the center of the measured lens is coincident with the center of the light path, so that the position adjustment of the measured lens is completed; at the same time, the collimated light beam emitted by the first light source component is focused at the tested lens by the first focusing component, and light scattering is generated on the upper and lower surfaces of the tested lens, and the collimated light beam is formed by the first imaging component and the second imaging componentThe image component images scattered light on the upper surface and the lower surface of the measured lens respectively to realize the measurement of the space height of scattered light spots on the upper surface and the lower surface of the measured lens, and the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens is the physical thickness D0 of the center of the lens; in addition, the light beam emitted by the first light source assembly is further divided into two beams by the light splitting assembly, one beam is projected onto the second reflector and reflected by the second reflector to return to the original path, the other beam is projected onto the first reflector and reflected by the first reflector to return to the original path, the two returned light beams enter the first photoelectric detection assembly through the light splitting assembly, the second reflector is moved to a proper position, namely when the optical path of the light beam emitted by the first light source assembly to the second reflector is completely equal to the optical path of the light beam emitted by the first reflector, the light beam reflected by the second reflector and the light beam reflected by the first reflector generate interference phenomena in the first photoelectric detection assembly, before the light beam is placed into the lens to be detected, the position d1 of the second reflector is recorded when the interference phenomena occur in the first photoelectric detection assembly, after the light beam is placed into the lens to be detected, the position of the second reflector is readjusted, and the position d2 of the second reflector is recorded when the interference phenomena occur again in the first photoelectric detection assembly, and the difference between the position d2 and d1 is related to the center optical thickness of the lens; then, according to the physical thickness D0 of the center of the lens and the related parameters D1 and D2 of the optical thickness of the center of the lens, the refractive index of the measured lens is calculated, and the calculation formula is as follows:

The beneficial effects of the technical scheme are as follows:

the lens refractive index detection device acquires relevant parameters for calculating the refractive index by detecting the space height difference and interference phenomenon of scattered light spots generated on the upper surface and the lower surface of the detected lens by focused light beams, does not need to manufacture a prism, does not need to detect relevant angles of the prism, is more convenient to operate, shortens the detection period, and can realize online rapid detection; the optical element to be detected is not damaged without manufacturing a prism, so that the method is also very suitable for detecting finished lenses; and the detection of the space height difference and interference phenomenon of the scattered light spots is also suitable for irregular surface lenses such as aspheric lenses, cylindrical lenses and the like.

According to the technical scheme, the lens refractive index detection device and the corresponding lens refractive index detection method are characterized in that: it comprises the following steps:

(1) Before the lens to be tested is inserted, the first light source component is turned on, and the spot center position of the light beam of the first light source component is monitored by the second photoelectric detection component and is used as a reference position;

(2) Detecting an interference phenomenon by the first photoelectric detection assembly, and recording the position d1 of the second reflecting mirror when the interference phenomenon occurs in the first photoelectric detection assembly;

(3) Inserting a measured lens, monitoring the actual spot center position of the light beam of the first light source component by the second photoelectric detection component, comparing the actual spot center position with the reference position obtained in the step (1), guiding a user to adjust the position of the measured lens according to the deviation of the actual spot center position and the reference position, and when the actual spot center position of the light beam of the first light source component is overlapped with the reference position, overlapping the center of the measured lens with the center of the light path to finish the position adjustment of the measured lens;

(4) The first imaging component and the second imaging component respectively image scattered light on the upper surface and the lower surface of the measured lens, so that the space height of scattered light spots on the upper surface and the lower surface of the measured lens is measured, and the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens is the physical thickness D0 of the center of the lens;

(5) Readjusting the position of the second reflecting mirror and recording the position d2 of the second reflecting mirror when the interference phenomenon occurs again in the first photoelectric detection assembly;

(6) According to the physical thickness D0 of the lens center and the related parameters D1 and D2 of the optical thickness of the lens center, the refractive index of the measured lens is calculated, and the calculation formula is as follows: n=1+ (D2-D1)/D0.

The second technical problem to be solved by the invention is: the lens refractive index detection device is simple in operation, capable of performing on-line rapid nondestructive detection, applicable to irregular surface lenses such as aspheric lenses and cylindrical lenses and finished lenses, and has an optical power detection function.

The first technical solution of the present invention for the second technical problem is: the utility model provides a lens refracting index detection device which characterized in that: comprises a light source module, a lens center physical thickness detection module and a lens center optical thickness detection module, wherein the light source module comprises a first light source component and a removable first focusing component which are used for outputting collimated light beams, the lens center physical thickness detection module comprises a first imaging component and a second imaging component, the lens center optical thickness detection module comprises a first photoelectric detection component, a second photoelectric detection component, a beam splitting component, a Hartmann plate and a removable second reflecting mirror, the second photoelectric detection component, the Hartmann plate, the beam splitting component, the removable first focusing component and the first light source component are sequentially arranged from front to back along the direction of a first optical axis, the upper surface of the Hartmann plate is coated with a reflecting film which is used for partially reflecting the light beams of the first light source component, the lower surface of the Hartmann plate is provided with an array light transmitting hole which is used for projecting a light spot array to the second photoelectric detection component, the movable second reflecting mirror is arranged on one side of the beam splitting component, the first photoelectric detection component is arranged on the other side of the beam splitting component, the focal plane of the first focusing component is positioned between the beam splitting component and the Hartmann plate and is used for placing a lens to be tested, the first imaging component and the second imaging component are respectively arranged above and below the lens to be tested, when the first focusing component is removed, the collimated light beam transmitted by the first light source component along the first optical axis direction is transmitted by the beam splitting component and then projected onto the lens to be tested and the Hartmann plate and enters the second photoelectric detection component, the light spot array projected by the Hartmann plate is detected by the second photoelectric detection component, after the first focusing component is inserted, the collimated light beam transmitted by the first light source component along the first optical axis direction is transmitted by the beam splitting component and focused by the first focusing component at the lens to be tested, meanwhile, scattered light spots are generated on the upper surface and the lower surface of the lens to be measured and detected by the first imaging component and the second imaging component, in addition, the light beam transmitted by the first light source component along the first optical axis direction is further divided into two beams by the light splitting component, one beam is projected onto the second reflecting mirror and reflected by the second reflecting mirror to return to the original path, the other beam is projected onto the Hartmann plate and reflected by the upper surface of the Hartmann plate to return to the original path, the light beam is also reflected into the first photoelectric detection component by the light splitting component, and the two returned light beams enter the first photoelectric detection component to be used for detecting interference phenomena.

The working principle of the technical scheme is as follows:

before a measured lens and a first focusing component move in, a first light source component is turned on, a collimated light beam transmitted by the first light source component along a first optical axis direction sequentially passes through a light splitting component and a Hartmann plate and then enters a second photoelectric detection component, a light spot array projected by the Hartmann plate is detected by the second photoelectric detection component, and the position of the light spot array is used as a reference position for position adjustment and focal power calculation of a subsequent measured lens; then moving into a first focusing assembly, dividing a light beam transmitted by the first light source assembly along the first optical axis direction into two beams by a light splitting assembly after passing through the first focusing assembly, wherein one beam is projected onto a second reflector and reflected by the second reflector to return in the original path, the other beam is projected onto a Hartmann plate and reflected by the upper surface of the Hartmann plate to return in the original path, and the two returned light beams enter into a first photoelectric detection assembly through the light splitting assembly to be used for detecting interference phenomena, and recording the position d1 of the second reflector when the interference phenomena occur; removing the first focusing assembly, moving the first focusing assembly into the measured lens, monitoring the projected actual light spot array by the second photoelectric detection assembly, calculating the center position of the lens at the moment according to the position of the actual light spot array and the deviation of the reference position obtained in the step (1), and guiding a user to adjust the position of the measured lens so that the center of the measured lens coincides with the center of the light path, thus finishing the position adjustment of the measured lens; meanwhile, the focal power of the measured lens can be calculated according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1); then moving into a first focusing assembly, readjusting the position of a second reflecting mirror, recording the difference value between the D2 and D1 of the second reflecting mirror and the optical thickness of the center of the lens when the interference phenomenon occurs in the first photoelectric detection assembly again, enabling the collimated light beam transmitted by the first light source assembly along the first optical axis direction to pass through a light splitting assembly, focusing the collimated light beam at the position of the measured lens by the first focusing assembly, generating light scattering on the upper surface and the lower surface of the measured lens, and respectively imaging scattered light on the upper surface and the lower surface of the measured lens by a first imaging assembly and a second imaging assembly to realize the measurement of the spatial height of scattered light spots on the upper surface and the lower surface of the measured lens, wherein the spatial height difference of scattered light spots on the upper surface and the lower surface of the measured lens is the central physical thickness D0 of the lens; then, according to the physical thickness D0 of the center of the lens and the related parameters D1 and D2 of the optical thickness of the center of the lens, the refractive index of the measured lens is calculated, and the calculation formula is as follows: n=1+ (D2-D1)/D0.

(1) Before the measured lens and the first focusing component move in, the first light source component is turned on, the light spot array projected by the Hartmann plate is detected by the second photoelectric detection component, and the position of the light spot array is used as a reference position for the position adjustment and focal power calculation of the subsequent measured lens;

(2) Moving into a first focusing assembly, detecting interference phenomenon by a first photoelectric detection assembly, and recording the position d1 of a second reflecting mirror when the interference phenomenon occurs;

(3) Removing the first focusing assembly, moving the first focusing assembly into the measured lens, monitoring the projected actual light spot array by the second photoelectric detection assembly, calculating the center position of the lens at the moment according to the position of the actual light spot array and the deviation of the reference position obtained in the step (1), and guiding a user to adjust the position of the measured lens so that the center of the measured lens coincides with the center of the light path, thus finishing the position adjustment of the measured lens; meanwhile, the focal power of the measured lens can be calculated according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1);

(4) Then moving into the first focusing assembly, readjusting the position of the second reflecting mirror, recording the position D2 of the second reflecting mirror when the interference phenomenon occurs again in the first photoelectric detection assembly, and simultaneously, respectively imaging scattered light on the upper surface and the lower surface of the measured lens by the first imaging assembly and the second imaging assembly to realize the measurement of the space heights of scattered light spots on the upper surface and the lower surface of the measured lens, wherein the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens is the physical thickness D0 of the center of the lens;

(5) According to the physical thickness D0 of the lens center and the related parameters D1 and D2 of the optical thickness of the lens center, the refractive index of the measured lens is calculated, and the calculation formula is as follows: n=1+ (D2-D1)/D0.

The second technical solution of the present invention for the second technical problem is: the utility model provides a lens refracting index detection device which characterized in that: comprises a light source module, a lens center physical thickness detection module and a lens center optical thickness detection module, wherein the light source module comprises a first light source component and a second light source component which are used for outputting collimated light beams, a first focusing component and a first light combining component, the lens center physical thickness detection module comprises a first imaging component and a second imaging component, the lens center optical thickness detection module comprises a first photoelectric detection component, a second photoelectric detection component, a beam splitting component, a Hartmann plate and a movable second reflecting mirror, the second photoelectric detection component, the Hartmann plate, the beam splitting component, the first light combining component and the second light source component are sequentially arranged from front to back along the first optical axis direction, the first light source component is arranged on one side of the first light combining component, the first focusing component is arranged between the first light source component and the first light combining component, the upper surface of the Hartmann plate is coated with a reflecting film for partially reflecting the light beam of the first light source component, the lower surface of the Hartmann plate is provided with an array light hole for projecting a light spot array to the second photoelectric detection component, the movable second reflecting mirror is arranged on one side of the light splitting component, the first photoelectric detection component is arranged on the other side of the light splitting component, the focal plane of the first focusing component is positioned between the light splitting component and the Hartmann plate and used for placing a lens to be tested, the first imaging component and the second imaging component are respectively arranged above and below the lens to be tested, the light beam output by the first light source component is transmitted along the first optical axis direction after being reflected by the first light combining component and focused by the first focusing component at the position of the lens to be tested, and meanwhile, the upper surface and the lower surface of the lens to be tested generate scattered light spots and are detected by the first imaging component and the second imaging component, meanwhile, the light beam transmitted by the first light source assembly along the first optical axis direction is further divided into two beams by the light splitting assembly, one beam is projected onto the second reflecting mirror and reflected by the second reflecting mirror to return in an original way, the other beam is projected onto the Hartmann plate and reflected by the upper surface of the Hartmann plate to return in an original way, the other beam is also reflected into the first photoelectric detection assembly by the light splitting assembly, the two returned light beams enter the first photoelectric detection assembly to be used for detecting interference phenomena, and the collimated light beam transmitted by the second light source assembly along the first optical axis direction is transmitted into the second photoelectric detection assembly after being transmitted onto the first light combining assembly, the light splitting assembly, the lens to be detected and the Hartmann plate, and the light spot array projected by the Hartmann plate is detected by the second photoelectric detection assembly.

The working principle of the technical scheme is as follows:

before the measured lens moves in, the first light source component is closed, the second light source component is opened, and the collimated light beam transmitted by the second light source component along the first optical axis direction enters the second photoelectric detection component after passing through the first light combination component, the light splitting component and the Hartmann plate, the light spot array projected by the Hartmann plate is detected by the second photoelectric detection component, and the position of the light spot array is used as a reference position for the position adjustment and the focal power calculation of the subsequent measured lens; then the second light source component is closed, the first light source component is opened, the light beams output by the first light source component are reflected by the first light combining component and then transmitted along the first optical axis direction, the light beams are divided into two beams by the light splitting component, one beam is projected onto the second reflecting mirror and reflected by the second reflecting mirror to return in the original path, the other beam is projected onto the Hartmann plate and reflected by the upper surface of the Hartmann plate to return in the original path, and the two returned light beams enter the first photoelectric detection component through the light splitting component to be used for detecting interference phenomenon, and the position d1 of the second reflecting mirror when the interference phenomenon occurs is recorded; then turning off the first light source assembly, turning on the second light source assembly, moving into the measured lens, monitoring the projected actual light spot array by the second photoelectric detection assembly, calculating the center position of the lens at the moment according to the position of the actual light spot array and the deviation of the reference position obtained in the step (1), and guiding a user to adjust the position of the measured lens, so that the center of the measured lens coincides with the center of the light path, and thus the position adjustment of the measured lens is completed; meanwhile, the focal power of the measured lens can be calculated according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1); then the second light source component is closed, the first light source component is opened, the position of the second reflecting mirror is readjusted, the difference value between the positions D2 and D1 of the second reflecting mirror is related to the optical thickness of the center of the lens when the interference phenomenon occurs in the first photoelectric detection component again, meanwhile, the light beam output by the first light source component is focused at the position of the lens to be detected by the first focusing component, light scattering is generated on the upper surface and the lower surface of the lens to be detected, the first imaging component and the second imaging component respectively image scattered light on the upper surface and the lower surface of the lens to be detected, the space height of scattered light spots on the upper surface and the lower surface of the lens to be detected is measured, and the space height difference of scattered light spots on the upper surface and the lower surface of the lens to be detected is the center physical thickness D0 of the lens; then, according to the physical thickness D0 of the center of the lens and the related parameters D1 and D2 of the optical thickness of the center of the lens, the refractive index of the measured lens is calculated, and the calculation formula is as follows: n=1+ (D2-D1)/D0.

(1) Before the measured lens moves in, the first light source component is closed, the second light source component is opened, the light spot array projected by the Hartmann plate is detected by the second photoelectric detection component, and the position of the light spot array is used as a reference position for the position adjustment and focal power calculation of the subsequent measured lens;

(2) Closing the second light source assembly, opening the first light source assembly, detecting an interference phenomenon in the first photoelectric detection assembly, and recording the position d1 of the second reflecting mirror when the interference phenomenon occurs;

(3) Closing the first light source assembly, opening the second light source assembly, moving into the measured lens, monitoring the projected actual light spot array by the second photoelectric detection assembly, calculating the center position of the lens at the moment according to the position of the actual light spot array and the deviation of the reference position obtained in the step (1), and guiding a user to adjust the position of the measured lens, so that the center of the measured lens coincides with the center of the light path, and thus the position adjustment of the measured lens is completed; meanwhile, the focal power of the measured lens can be calculated according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1);

(4) The second light source component is closed, the first light source component is opened, the position of the second reflecting mirror is readjusted, the difference value between the positions D2 and D1 of the second reflecting mirror is related to the optical thickness of the center of the lens when the interference phenomenon occurs in the first photoelectric detection component again, meanwhile, the light beam output by the first light source component is focused at the position of the lens to be detected by the first focusing component, light scattering is generated on the upper surface and the lower surface of the lens to be detected, the first imaging component and the second imaging component respectively image scattered light on the upper surface and the lower surface of the lens to be detected, the space height of scattered light spots on the upper surface and the lower surface of the lens to be detected is measured, and the space height difference of scattered light spots on the upper surface and the lower surface of the lens to be detected is the center physical thickness D0 of the lens;

The third technical solution of the present invention for the second technical problem is: the utility model provides a lens refracting index detection device which characterized in that: the system comprises a light source module, a lens center physical thickness detection module and a lens center optical thickness detection module, wherein the light source module comprises a first light source component, a second light source component, a third light source component, a first light combining component, a second light combining component and a first focusing component, which are used for outputting collimated light beams; the collimated light beam output by the first light source component is transmitted along the first optical axis direction after being transmitted through the first light combining component, and is focused at the position of the lens to be detected by the first focusing component, and meanwhile, scattered light spots are generated on the upper surface and the lower surface of the lens to be detected by the first imaging component and the second imaging component; the third light source assembly is positioned on the rear focal point of the first focusing assembly, light beams output by the third light source assembly are sequentially reflected by the second light combining assembly and the first light combining assembly, focused into parallel light beams by the first focusing assembly and transmitted along the first optical axis direction, and the parallel light beams transmitted by the third light source assembly along the first optical axis direction are transmitted through the lens to be tested and the Hartmann plate and then detected by the second photoelectric detection assembly to be transmitted through the light spot array of the Hartmann plate; the collimated light beam output by the second light source assembly is transmitted through the second light combining assembly and is reflected by the first light combining assembly and then transmitted along the first optical axis direction, and is divided into two beams by the light splitting assembly, wherein one beam is projected onto the second reflecting mirror and is reflected by the second reflecting mirror to return in an original way, the other beam is further transmitted onto the first photoelectric detection assembly through the light splitting assembly, is projected onto the Hartmann plate and is reflected by the upper surface of the Hartmann plate to return in an original way, and is also reflected into the first photoelectric detection assembly through the light splitting assembly, and the two returned light beams enter the first photoelectric detection assembly to be used for detecting interference phenomena.

The working principle of the technical scheme is as follows:

before the measured lens moves in, the first light source component and the second light source component are turned off, the third light source component is turned on, the second photoelectric detection component detects the light spot array transmitted by the Hartmann plate (30), and the position of the light spot array is used as a reference position for the position adjustment and focal power calculation of the subsequent measured lens; turning off the third light source assembly, turning on the second light source assembly, detecting interference phenomenon by the first photoelectric detection assembly, and recording the position d1 of the second reflecting mirror when the interference phenomenon occurs; closing the second light source assembly, opening the third light source assembly, moving the third light source assembly into the measured lens, monitoring the projected actual light spot array by the second photoelectric detection assembly, calculating the center position of the lens at the moment according to the position of the actual light spot array and the deviation of the reference position obtained in the step (1), guiding a user to adjust the position of the measured lens, and enabling the center of the measured lens to coincide with the center of the light path, thus finishing the position adjustment of the measured lens; meanwhile, the focal power of the measured lens can be calculated according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1); the third light source component is turned off, the first light source component is turned on, the light beam output by the first light source component is focused at the position of the measured lens by the first focusing component, light scattering is generated on the upper surface and the lower surface of the measured lens, the scattered light on the upper surface and the lower surface of the measured lens is imaged by the first imaging component and the second imaging component respectively, the space height of scattered light spots on the upper surface and the lower surface of the measured lens is measured, and the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens is the center physical thickness D0 of the lens; closing the first light source assembly, opening the second light source assembly, readjusting the position of the second reflecting mirror, and recording the position d2 of the second reflecting mirror when the interference phenomenon occurs again in the first photoelectric detection assembly, wherein the difference value between d2 and d1 is related to the optical thickness of the center of the lens; finally, according to the physical thickness D0 of the lens center and the related parameters D1 and D2 of the optical thickness of the lens center, the refractive index of the measured lens (13) is calculated, and the calculation formula is as follows: n=1+ (D2-D1)/D0.

(1) Before the measured lens moves in, the first light source component and the second light source component are turned off, the third light source component is turned on, the second photoelectric detection component detects the light spot array transmitted by the Hartmann plate, and the position of the light spot array is used as a reference position for the position adjustment and focal power calculation of the subsequent measured lens;

(3) Turning off the third light source assembly, turning on the second light source assembly, detecting interference phenomenon by the first photoelectric detection assembly, and recording the position d1 of the second reflecting mirror when the interference phenomenon occurs;

(4) Closing the second light source assembly, opening the third light source assembly, moving the third light source assembly into the measured lens, monitoring the projected actual light spot array by the second photoelectric detection assembly, calculating the center position of the lens at the moment according to the position of the actual light spot array and the deviation of the reference position obtained in the step (1), guiding a user to adjust the position of the measured lens, and enabling the center of the measured lens to coincide with the center of the light path, thus finishing the position adjustment of the measured lens; meanwhile, the focal power of the measured lens can be calculated according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1);

(5) The third light source component is turned off, the first light source component is turned on, the light beam output by the first light source component is focused at the position of the measured lens by the first focusing component, light scattering is generated on the upper surface and the lower surface of the measured lens, the scattered light on the upper surface and the lower surface of the measured lens is imaged by the first imaging component and the second imaging component respectively, the space height of scattered light spots on the upper surface and the lower surface of the measured lens is measured, and the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens is the center physical thickness D0 of the lens;

(6) Closing the first light source assembly, opening the second light source assembly, readjusting the position of the second reflecting mirror, and recording the position d2 of the second reflecting mirror when the interference phenomenon occurs again in the first photoelectric detection assembly, wherein the difference value between d2 and d1 is related to the optical thickness of the center of the lens;

(7) According to the physical thickness D0 of the lens center and the related parameters D1 and D2 of the optical thickness of the lens center, the refractive index of the measured lens is calculated, and the calculation formula is as follows: n=1+ (D2-D1)/D0.

The three technical schemes have the following beneficial effects:

the lens refractive index detection device acquires relevant parameters for calculating the refractive index by detecting the space height difference and interference phenomenon of scattered light spots generated on the upper surface and the lower surface of the detected lens by focused light beams, does not need to manufacture a prism, does not need to detect relevant angles of the prism, is more convenient to operate, shortens the detection period, and can realize online rapid detection; the optical element to be detected is not damaged without manufacturing a prism, so that the method is also very suitable for detecting finished lenses; the detection of the space height difference and interference phenomenon of the scattered light spots is also suitable for irregular surface lenses such as an aspheric lens, a cylindrical lens and the like; in addition, the Hartmann plate is arranged to correct whether the center of the lens to be detected is aligned with the center of the optical path, and the focal power is detected according to the deviation condition of the light spot array detected by the Hartmann plate.

Description of the drawings:

FIG. 1 is an optical schematic diagram of a lens refractive index detection device according to an embodiment 1 of the present invention;

FIG. 2 is an optical schematic diagram of a lens refractive index detection device in embodiment 3 of the present invention;

FIG. 3 is an optical schematic diagram of a lens refractive index detection device according to embodiment 5 of the present invention;

FIG. 4 is an optical schematic diagram of a lens refractive index detection device according to embodiment 7 of the present invention;

FIG. 5 is a graph of conjugate relationships of object images imaged by oblique imaging lens according to the present invention;

FIG. 6 is a schematic diagram of the structure of a Hartmann plate of the present invention;

FIG. 7 is a schematic view of another embodiment of a Hartmann plate of the present invention;

in the figure: 1-first light source component, 2-second light source component, 3-third light source component, 4-first focusing component, 5-second focusing component Jiao Zujian, 6-first imaging component, 7-second imaging component, 8-first photoelectric detection component, 9-second photoelectric detection component, 10-light splitting component, 11-first reflecting mirror, 12-second reflecting mirror, 13-lens to be tested, 14-first light combining component, 15-first monochromatic LED test light source, 16-second monochromatic LED test light source, 17-first light transmitting hole, 18-second light holes, 19-first collimating lenses, 20-second collimating lenses, 21-first light splitters, 22-second light splitters, 23-third light splitters, 24-fourth light splitters, 25-focusing lenses, 26-oblique image lenses, 27-cameras, 28-frame, 29-second light combining components, 30-Hartmann plates, 31-array light holes, 32-reflecting films, 33-object planes, 34-image planes, A-first optical axis directions, B-second optical axis directions, C-third optical axis directions and D-fourth optical axis directions.

Detailed Description

The invention will be further described with reference to the accompanying drawings, in conjunction with examples.

Example 1:

the utility model provides a lens refractive index detection device, includes light source module, lens center physical thickness detection module and lens center optical thickness detection module, the light source module includes first light source subassembly 1, the first focusing subassembly 4 that are used for the output collimated light beam, lens center physical thickness detection module includes first imaging subassembly 6 and second imaging subassembly 7, lens center optical thickness detection module includes first photoelectric detection subassembly 8, second photoelectric detection subassembly 9, beam split subassembly 10, the first speculum 11 of partial reflection, movable second speculum 12, second photoelectric detection subassembly 9, first speculum 11, beam split subassembly 10, first focusing subassembly 4 and first light source subassembly 1 set gradually from front to back along first optical axis direction A, movable second speculum 12 sets up in one side of beam split subassembly 10, the first photoelectric detection component 8 is arranged on the other side of the beam splitting component 10, the focal plane of the first focusing component 4 is positioned between the beam splitting component 10 and the first reflecting mirror 11 and is used for placing a measured lens 13, the first imaging component 6 and the second imaging component 7 are respectively arranged above and below the measured lens 13, the collimated light beam transmitted by the first light source component 1 along the first optical axis direction A is focused on the measured lens 13 through the first focusing component 4, meanwhile, scattered light spots are generated on the upper surface and the lower surface of the measured lens 13 and detected by the first imaging component 6 and the second imaging component 7, the light beam focused by the first light source component 1 is also transmitted into the second photoelectric detection component 9 through the first reflecting mirror 11, the light beam transmitted by the first light source component 1 along the first optical axis direction A is further divided into two beams through the beam splitting component 10, one beam is projected onto the second reflecting mirror 12 and reflected by the second reflecting mirror 12 to return in the original path, and is further transmitted to the first photoelectric detection assembly 8 through the beam splitting assembly 10, the other beam is projected onto the first reflecting mirror 11 and reflected by the first reflecting mirror 11 to return in the original path, and is also reflected to the first photoelectric detection assembly 8 through the beam splitting assembly 10, and the two returned beams enter the first photoelectric detection assembly 8 for detecting interference phenomena.

The light reflectivity of the first reflecting mirror 11 is larger than the light transmittance, and a second focusing assembly 5 is further arranged between the first reflecting mirror 11 and the second photoelectric detection assembly 9 and used for converging the light beams transmitted by the first light source assembly 1 through the first reflecting mirror 11, and the light reflectivity and the light transmittance are both the light beams emitted by the first light source assembly 1. The provision of the second condenser Jiao Zujian 5 enhances the transmitted light which is weak in the original light intensity, so that the lens center position correction can be performed by reliably focusing into the second photodetector assembly 9.

The light reflectance of the first reflecting mirror 11 is 80% to 90%, and the light transmittance is 10% to 20%. This arrangement ensures both interference phenomena and the light intensity required for lens position detection.

The first light source assembly 1 includes a first single-color LED test light source 15, where the first single-color LED test light source 15 may be in a patch package, the first single-color LED test light source 15 may be green light of 530nm or 540nm, blue light of 450nm or 480nm, red light of 610nm or 630nm, etc., the first single-color LED test light source 15 may test the refractive index at which wavelength, a first light hole 17 is provided in front of the first single-color LED test light source 15, a first collimating lens 19 is provided in front of the first light hole 17, and the first single-color LED test light source 15 is disposed at the back focal point of the first collimating lens 19, so that the light beam emitted by the first single-color LED test light source 15 through the first light hole 17 is changed into a collimated light beam after passing through the first collimating lens 19, and is projected onto the first focusing assembly 4. The first monochromatic LED test light source 15 is low in cost, low in energy consumption and safer to use; converting the first monochromatic LED test light source 15 into a collimated beam may make the optical path coupling more reliable.

The light splitting assembly 10 includes a half-transparent and half-reflective first light splitting sheet 21, the first focusing assembly 4 includes a focusing lens 25, the center of the first light splitting sheet 21, the center of the focusing lens 25, the center of the first collimating lens 19, the center of the first light hole 17 and the center of the first monochromatic LED test light source 15 are all located in the first optical axis direction a, the center of the second reflecting mirror 12, the center of the first light splitting sheet 21 and the center of the first photoelectric detection assembly 8 are all located in the second optical axis direction B perpendicular to the first optical axis direction a, when the second reflecting mirror 12 is located at the left side of the first light splitting sheet 21, an included angle between the side surface of the first light splitting sheet 21 and the second optical axis direction B is 45 °, and when the second reflecting mirror 12 is located at the right side of the first light splitting sheet 21, an included angle between the side surface of the first light splitting sheet 21 and the second optical axis direction B is 135 °. The device has the advantages of few elements, simple structure and reliable optical path coupling.

The first imaging component 6 and the second imaging component 7 are both cameras 27 with oblique imaging lenses 26, an included angle between an optical axis direction of the oblique imaging lenses 26 and a first optical axis direction a and an included angle between an optical axis direction of the oblique imaging lenses 26 and an imaging chip plane of the cameras 27 satisfy an object image conjugate relationship of oblique imaging of the imaging lenses, as shown in fig. 5, 33 represents an object plane, 34 represents an imaging plane, the imaging plane 34 is an imaging chip plane of the first imaging component 6 or the second imaging component 7, scattered light generated by a focused light beam output by the first light source component 1 on the upper surface and the lower surface of the measured lens 13 is focused and imaged on the imaging chip planes in the two cameras 27 respectively through the two oblique imaging lenses 26, the first imaging component 6 is used for measuring a spatial height of an intersection point between the focused light beam of the first light source component 1 and the upper surface of the measured lens 13, and the second imaging component 7 is used for measuring a spatial height of an intersection point between the focused light beam of the first light source component 1 and the lower surface of the measured lens 13, and the spatial height difference between the intersection point of the upper surface and the lower surface is a lens center physical thickness D0. The oblique imaging lens 26 has better imaging effect, and the acquired image is more accurate.

The first photoelectric detection component 8 is an area camera 27, a linear camera 27 or a photodiode. This arrangement can make interference phenomenon detection more accurate.

The second photo-detecting element 9 is a position sensitive detector or area camera 27. This arrangement may allow for more accurate lens position calibration.

Also included are a frame 28 positioned near the focal plane of the first focusing assembly 4 and a motor for driving the frame 28 to move left and right for driving the lens 13 under test mounted on the frame 28 to move automatically. This arrangement can drive the measured lens 13 mounted on the frame 28 to move automatically, and is more convenient to operate and accurate in position control.

In this embodiment, the spectrum width of the first monochromatic LED test light source 15 is 10nm to 50nm, and the center wavelength is 546nm; the diameter of the first light transmission holes 17 is smaller than 0.5mm, preferably the diameter of the first light transmission holes 17 is smaller than 0.2mm, for example 0.15mm; the distance between the first light transmission hole 17 and the first single-color LED test light source 15 is smaller than 0.5mm, for example, 0.2mm; the focal length of the first collimating lens 19 is greater than 50mm, preferably the focal length of the first collimating lens 19 is greater than 100mm; the focal length of the focusing lens 25 is greater than 50mm, preferably the focal length of the focusing lens 25 is greater than 100mm, for example 120mm; the transmittance and reflectance of the first beam splitter 21 to the light beam of the first single-color LED test light source 15 is 1:1; the light reflectance of the first reflecting mirror 11 is 80% to 90%, and the light transmittance is 10% to 20%.

The working principle of the lens refractive index detection device of the invention is as follows:

before the lens 13 to be measured is placed, the first light source component 1 is turned on, the collimated light beam emitted by the first light source component 1 is focused by the first focusing component 4 and is partially transmitted out by the first reflecting mirror 11 and is projected into the second photoelectric detection component 9, and the spot center position of the projected light beam is monitored by the second photoelectric detection component 9 and is used as a reference position for adjusting the position of the subsequent lens 13 to be measured; the measured lens 13 is put in, the second photoelectric detection component 9 monitors the actual spot center position of the projected light beam, compares the actual spot center position with the reference position obtained before, guides the user to adjust the position of the measured lens 13 according to the deviation of the actual spot center position and the reference position, and when the actual spot center position is coincident with the reference position, the center of the measured lens 13 is coincident with the center of the light path, thus completing the position adjustment of the measured lens 13; meanwhile, the collimated light beam emitted by the first light source component 1 is focused at the position of the measured lens 13 through the first focusing component 4, light scattering is generated on the upper surface and the lower surface of the measured lens 13, the scattered light on the upper surface and the lower surface of the measured lens 13 is imaged by the first imaging component 6 and the second imaging component 7 respectively, the space height of scattered light spots on the upper surface and the lower surface of the measured lens 13 is measured, and the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens 13 is the physical thickness D0 of the center of the lens; in addition, the light beam emitted from the first light source assembly 1 is split into two beams by the beam splitter assembly 10, one beam is projected onto the second reflector 12 and reflected by the second reflector 12 to return in the original path, and the other beam is projected onto the first reflector 11 and reflected by the first reflector The mirror 11 reflects and returns in the original path, the two returned light beams enter the first photoelectric detection assembly 8 through the light splitting assembly 10, the second reflecting mirror 12 is moved to a proper position, namely when the optical path of the light beam emitted by the first light source assembly 1 to the second reflecting mirror 12 is completely equal to the optical path of the light beam emitted by the first light source assembly 11, the light beam reflected by the second reflecting mirror 12 and the light beam reflected by the first reflecting mirror 11 generate interference phenomena in the first photoelectric detection assembly 8, before the light beam is placed in the measured lens 13, the position d1 of the second reflecting mirror 12 when the interference phenomena occur in the first photoelectric detection assembly 8 is recorded, after the light beam is placed in the measured lens 13, the position d2 of the second reflecting mirror 12 is readjusted, and when the interference phenomena occur again in the first photoelectric detection assembly 8, the difference between the d2 and d1 is related to the central optical thickness of the lens; then, the refractive index of the measured lens 13 is calculated according to the lens center physical thickness D0 and the lens center optical thickness related parameters D1 and D2, and the calculation formula is as follows:

the lens refractive index detection device acquires relevant parameters for calculating the refractive index by detecting the space height difference and interference phenomenon of scattered light spots generated on the upper surface and the lower surface of the detected lens 13 by focused light beams, does not need to manufacture a prism, does not need to detect relevant angles of the prism, is more convenient to operate, shortens the detection period, and can realize online rapid detection; the optical element to be detected is not damaged without manufacturing a prism, so that the method is also very suitable for detecting finished lenses; and the detection of the space height difference and interference phenomenon of the scattered light spots is also suitable for irregular surface lenses such as aspheric lenses, cylindrical lenses and the like.

Example 2:

a lens refractive index detection method based on the lens refractive index detection apparatus of embodiment 1, comprising the steps of:

(1) Before the lens 13 to be tested is inserted, the first light source component 1 is turned on, and the spot center position of the light beam of the first light source component 1 is monitored by the second photoelectric detection component 9 and is used as a reference position;

(2) Detecting an interference phenomenon by the first photoelectric detection assembly 8, and recording the position d1 of the second reflecting mirror 12 when the interference phenomenon occurs in the first photoelectric detection assembly 8;

(3) Inserting a measured lens 13, monitoring the actual spot center position of the light beam of the first light source component 1 by the second photoelectric detection component 9, comparing the actual spot center position with the reference position obtained in the step (1), guiding a user to adjust the position of the measured lens 13 according to the deviation of the actual spot center position and the reference position, and when the actual spot center position of the light beam of the first light source component 1 is overlapped with the reference position, overlapping the center of the measured lens 13 with the center of the light path to finish the position adjustment of the measured lens 13;

(4) The first imaging component 6 and the second imaging component 7 respectively image scattered light on the upper surface and the lower surface of the measured lens 13, so that the space height of scattered light spots on the upper surface and the lower surface of the measured lens 13 is measured, and the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens 13 is the physical thickness D0 of the center of the lens;

(5) Readjusting the position of the second mirror 12 and recording the position d2 of the second mirror 12 when the interference phenomenon occurs again in the first photodetector assembly 8;

(6) The refractive index of the measured lens 13 is calculated according to the lens center physical thickness D0 and the lens center optical thickness related parameters D1 and D2, and the calculation formula is as follows:

example 3:

the utility model provides a lens refractive index detection device, including light source module, lens center physical thickness detection module and lens center optical thickness detection module, the light source module includes the first light source subassembly 1 that is used for exporting collimated light beam, removable first focusing subassembly 4, lens center physical thickness detection module includes first imaging component 6 and second imaging component 7, lens center optical thickness detection module includes first photo-detection subassembly 8, second photo-detection subassembly 9, beam splitting subassembly 10, hartmann board 30, removable second speculum 12, second photo-detection subassembly 9, hartmann board 30, beam splitting subassembly 10, removable first focusing subassembly 4 and first light source subassembly 1 set gradually from front to back along first optical axis direction A, the upper surface of Hartmann board 30 scribbles reflective film 32 and is used for the partial reflection light beam of first light source subassembly 1, the lower surface of the Hartmann plate 30 is provided with an array light hole 31 for projecting the light spot array to the second photoelectric detection component 9, the movable second reflecting mirror 12 is arranged on one side of the beam splitting component 10, the first photoelectric detection component 8 is arranged on the other side of the beam splitting component 10, the focal plane of the first focusing component 4 is positioned between the beam splitting component 10 and the Hartmann plate 30 for placing the tested lens 13, the first imaging component 6 and the second imaging component 7 are respectively arranged above and below the tested lens 13, when the first focusing component 4 is removed, the collimated light beam transmitted by the first light source component 1 along the first optical axis direction A is transmitted through the beam splitting component 10, then projected onto the tested lens 13 and the Hartmann plate 30 and enters the second photoelectric detection component 9, and the light spot array projected by the Hartmann plate 30 is detected by the second photoelectric detection component 9, after the first focusing assembly 4 is inserted, the collimated light beam transmitted by the first light source assembly 1 along the first optical axis direction a is transmitted through the beam splitting assembly 10 and focused by the first focusing assembly 4 at the measured lens 13, meanwhile, scattered light spots are generated on the upper surface and the lower surface of the measured lens 13 and detected by the first imaging assembly 6 and the second imaging assembly 7, in addition, the light beam transmitted by the first light source assembly 1 along the first optical axis direction a is further divided into two beams by the beam splitting assembly 10, one beam is projected onto the second reflecting mirror 12 and reflected by the second reflecting mirror 12 to be returned in an original way, further transmitted to the first photoelectric detection assembly 8 by the beam splitting assembly 10, the other beam is projected onto the Hartmann plate 30 and reflected by the upper surface of the Hartmann plate 30 to be returned in an original way, and also reflected to the first photoelectric detection assembly 8 by the beam splitting assembly 10, and the two returned light beams are all entered into the first photoelectric detection assembly 8 by the beam splitting assembly 10 to be used for detecting interference phenomena.

The first imaging component 6 and the second imaging component 7 are both cameras 27 with oblique imaging lenses 26, and the included angle of the optical axis direction of the oblique imaging lenses 26 relative to the first optical axis direction a and the included angle of the optical axis direction of the oblique imaging lenses 26 relative to the imaging chip plane of the cameras 27 meet the object image conjugate relation of oblique imaging of the imaging lenses. The oblique imaging lens 26 has better imaging effect, and the acquired image is more accurate.

The second photo-detecting element 9 is a position sensitive detector or area camera 27. This arrangement may allow for more accurate lens position calibration and power calculation.

The present embodiment differs from the lens refractive index detection device in embodiment 1 in that: 1. the first focusing assembly 4 becomes a removable structure, removable by electronically controlled translation or rotation; 2. the first mirror 11 becomes the hartmann plate 30; 3. the second focusing assembly 5 is removed.

In this embodiment, the spectrum width of the first monochromatic LED test light source 15 is 10nm to 50nm, and the center wavelength is 546nm; the diameter of the first light transmission holes 17 is smaller than 0.5mm, preferably the diameter of the first light transmission holes 17 is smaller than 0.2mm, for example 0.15mm; the distance between the first light transmission hole 17 and the first single-color LED test light source 15 is smaller than 0.5mm, for example, 0.2mm; the focal length of the first collimating lens 19 is greater than 50mm, preferably the focal length of the first collimating lens 19 is greater than 100mm; the focal length of the focusing lens 25 is greater than 50mm, preferably the focal length of the focusing lens 25 is greater than 100mm, for example 120mm; the transmittance and reflectance of the first beam splitter 21 to the light beam of the first single-color LED test light source 15 is 1:1; the Hartmann plate 30 has a structure as shown in fig. 6 and 7, wherein the upper surface is coated with a partial reflective film 32, the reflectivity of the light source is 80% -90% for 500-600nm, the lower surface is coated with an array circular hole type metal film to form an array light transmitting hole 31, the rows and columns of the array light transmitting hole 31 are odd numbers, the diameter of the most central circular hole in the array light transmitting hole 31 is larger than the diameters of the other circular holes, for example, the diameter of the central circular hole is 0.5mm, the diameters of the other circular holes are 0.2mm, and the center distance of the circular holes is 0.5-0.6mm.

Before the lens 13 to be tested and the first focusing assembly 4 are moved in, the first light source assembly 1 is turned on, and the first light source assembly 1 is arranged along the direction of the lensThe collimated light beam transmitted in the first optical axis direction A sequentially passes through the light splitting component 10 and the Hartmann plate 30 and then enters the second photoelectric detection component 9, the second photoelectric detection component 9 detects the light spot array projected by the Hartmann plate 30, and the position of the light spot array is used as a reference position for the position adjustment and focal power calculation of the follow-up measured lens 13; then moving into the first focusing assembly 4, after passing through the first focusing assembly 4, the light beam transmitted by the first light source assembly 1 along the first optical axis direction a is split into two beams by the beam splitting assembly 10, one beam is projected onto the second reflecting mirror 12 and reflected by the second reflecting mirror 12 to return in the original way, the other beam is projected onto the Hartmann plate 30 and reflected by the upper surface of the Hartmann plate 30 to return in the original way, and the two returned light beams enter the first photoelectric detection assembly 8 through the beam splitting assembly 10 to be used for detecting interference phenomena, and the position d1 of the second reflecting mirror 12 when the interference phenomena occur is recorded; removing the first focusing assembly 4, moving into the measured lens 13, monitoring the projected actual light spot array by the second photoelectric detection assembly 9, calculating the center position of the lens at the moment according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1), and guiding a user to adjust the position of the measured lens 13, so that the center of the measured lens 13 coincides with the center of the optical path, thereby completing the position adjustment of the measured lens 13; meanwhile, the focal power of the measured lens 13 can be calculated according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1), and the center position and the focal power of the lens are calculated according to the deviation between the position of the actual light spot array and the reference position; then moving into the first focusing component 4, readjusting the position of the second reflecting mirror 12 and recording the difference between the positions d2, d2 and d1 of the second reflecting mirror 12 and the optical thickness of the center of the lens when the interference phenomenon occurs again in the first photoelectric detection component 8, wherein the collimated light beam transmitted by the first light source component 1 along the first optical axis direction A is transmitted through the light splitting component 10 and focused by the first focusing component 4 at the position of the measured lens 13, and light scattering is generated on the upper and lower surfaces of the measured lens 13, the scattered light on the upper and lower surfaces of the measured lens 13 is imaged by the first imaging component 6 and the second imaging component 7 respectively, so as to realize the height measurement of the scattered light spot space on the upper and lower surfaces of the measured lens 13, and the scattered light spot space on the upper and lower surfaces of the measured lens 13 The height difference is the physical thickness D0 of the center of the lens; then, the refractive index of the measured lens 13 is calculated according to the lens center physical thickness D0 and the lens center optical thickness related parameters D1 and D2, and the calculation formula is as follows:

the lens refractive index detection device acquires relevant parameters for calculating the refractive index by detecting the space height difference and interference phenomenon of scattered light spots generated on the upper surface and the lower surface of the detected lens 13 by focused light beams, does not need to manufacture a prism, does not need to detect relevant angles of the prism, is more convenient to operate, shortens the detection period, and can realize online rapid detection; the optical element to be detected is not damaged without manufacturing a prism, so that the method is also very suitable for detecting finished lenses; the detection of the space height difference and interference phenomenon of the scattered light spots is also suitable for irregular surface lenses such as an aspheric lens, a cylindrical lens and the like; the Hartmann plate 30 is also used to correct whether the center of the lens to be measured is aligned with the center of the optical path, and to detect the optical power of the lens according to the offset of the light spot array detected by the Hartmann plate 30.

Example 4:

a lens refractive index detection method based on the lens refractive index detection apparatus in embodiment 3, comprising the steps of:

(1) Before the measured lens 13 and the first focusing component 4 move in, the first light source component 1 is turned on, the second photoelectric detection component 9 detects the light spot array projected by the Hartmann plate 30, and the position of the light spot array is used as a reference position for the position adjustment and focal power calculation of the subsequent measured lens 13;

(2) Moving into the first focusing assembly 4, detecting interference phenomenon by the first photoelectric detection assembly 8, and recording the position d1 of the second reflecting mirror 12 when the interference phenomenon occurs;

(3) Removing the first focusing assembly 4, moving into the measured lens 13, monitoring the projected actual light spot array by the second photoelectric detection assembly 9, calculating the center position of the lens at the moment according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1), and guiding a user to adjust the position of the measured lens 13, so that the center of the measured lens 13 coincides with the center of the optical path, thereby completing the position adjustment of the measured lens 13; meanwhile, the focal power of the measured lens 13 can be calculated according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1);

(4) Then moving into the first focusing assembly 4, readjusting the position of the second reflecting mirror 12, recording the position D2 of the second reflecting mirror 12 when the interference phenomenon occurs again in the first photoelectric detection assembly 8, and simultaneously, respectively imaging scattered light on the upper surface and the lower surface of the measured lens 13 by the first imaging assembly 6 and the second imaging assembly 7 to realize the measurement of the space heights of scattered light spots on the upper surface and the lower surface of the measured lens 13, wherein the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens 13 is the physical thickness D0 of the center of the lens;

(5) The refractive index of the measured lens 13 is calculated according to the lens center physical thickness D0 and the lens center optical thickness related parameters D1 and D2, and the calculation formula is as follows:

example 5:

the utility model provides a lens refractive index detection device, including light source module, lens center physical thickness detection module and lens center optical thickness detection module, the light source module includes first light source subassembly 1 and second light source subassembly 2, first focusing subassembly 4 and first light combining subassembly 14 that are used for the output collimated light beam, lens center physical thickness detection module includes first imaging subassembly 6 and second imaging subassembly 7, lens center optical thickness detection module includes first photo detection subassembly 8, second photo detection subassembly 9, beam split subassembly 10, hartmann board 30, mobilizable second speculum 12, second photo detection subassembly 9, hartmann board 30, beam split subassembly 10, first light combining subassembly 14 and second light source subassembly 2 set gradually from front to back along first optical axis direction A, first light source subassembly 1 sets up in one side of first light combining subassembly 14, the first focusing assembly 4 is arranged between the first light source assembly 1 and the first light combining assembly 14, the upper surface of the Hartmann plate 30 is coated with a reflective film 32 for partially reflecting the light beam of the first light source assembly 1, the lower surface of the Hartmann plate 30 is provided with an array light-transmitting hole 31 for projecting a light spot array to the second photoelectric detection assembly 9, the movable second reflecting mirror 12 is arranged at one side of the light splitting assembly 10, the first photoelectric detection assembly 8 is arranged at the other side of the light splitting assembly 10, the focal plane of the first focusing assembly 4 is positioned between the light splitting assembly 10 and the Hartmann plate 30 for placing the lens 13 to be measured, the first imaging assembly 6 and the second imaging assembly 7 are respectively arranged above and below the lens 13 to be measured, the light beam output by the first light source assembly 1 is transmitted along the first optical axis direction A after being reflected by the first light combining assembly 14, the first focusing component 4 focuses on the measured lens 13, scattering light spots are generated on the upper surface and the lower surface of the measured lens 13 and detected by the first imaging component 6 and the second imaging component 7, meanwhile, the light beam transmitted by the first light source component 1 along the first optical axis direction A is further divided into two beams by the beam splitting component 10, one beam is projected onto the second reflecting mirror 12 and reflected by the second reflecting mirror 12 to be returned in the original path, the other beam is projected onto the Hartmann plate 30 and reflected by the upper surface of the Hartmann plate 30 to be returned in the original path, the light beams reflected by the beam splitting component 10 are also transmitted into the first photoelectric detection component 8 for detecting interference phenomena, and the collimated light beam transmitted by the second light source component 2 along the first optical axis direction A is transmitted through the first combining component 14, the beam splitting component 10, the measured lens 13 and the Hartmann plate 30 to be transmitted into the second photoelectric detection component 9 and reflected by the Hartmann plate 30 to be returned to the first photoelectric detection component 9 to be used for detecting light spots projected by the Hartmann plate 9.

The second light source assembly 2 includes a second single-color LED test light source 16, where the second single-color LED test light source 16 may be in a patch package, the second single-color LED test light source 16 may be green light of 530nm or 540nm, blue light of 450nm or 480nm, red light of 610nm or 630nm, etc., a second light hole 18 is disposed in front of the second single-color LED test light source 16, a second collimating lens 20 is disposed in front of the second light hole 18, and the second single-color LED test light source 16 is disposed at a back focal point of the second collimating lens 20, so that a light beam emitted by the second single-color LED test light source 16 through the second light hole 18 is changed into a collimated light beam after passing through the second collimating lens 20. The second monochromatic LED test light source 16 has low cost, low energy consumption and safer use; converting the second monochromatic LED test light source 16 to a collimated beam may make the optical path coupling more reliable.

The light splitting assembly 10 includes a first light splitting sheet 21 with half-transmission and half-reflection, the center of the second reflecting mirror 12, the center of the first light splitting sheet 21 and the center of the first photoelectric detection assembly 8 are all located in a second optical axis direction B perpendicular to the first optical axis direction a, when the second reflecting mirror 12 is located at the left side of the first light splitting sheet 21, an included angle between the side surface of the first light splitting sheet 21 and the second optical axis direction B is 45 °, and when the second reflecting mirror 12 is located at the right side of the first light splitting sheet 21, an included angle between the side surface of the first light splitting sheet 21 and the second optical axis direction B is 135 °. The device has the advantages of few elements, simple structure and reliable optical path coupling.

The first light combining component 14 includes a half-transmissive second light splitting sheet 22, the first focusing component 4 includes a focusing lens 25, the center of the first single-color LED test light source 15, the center of the first light transmitting hole 17, the center of the first collimating lens 19, the center of the focusing lens 25, and the center of the second light splitting sheet 22 are all located in a third optical axis direction C perpendicular to the first optical axis direction a, the center of the second single-color LED test light source 16, the center of the second light transmitting hole 18, the center of the second collimating lens 20, and the center of the second light splitting sheet 22 are all located in the first optical axis direction a, when the first single-color LED test light source 15 is located at the left side of the second light splitting sheet 22, an included angle between the side surface of the second light splitting sheet 22 and the third optical axis direction C is 135 °, and when the first single-color LED test light source 15 is located at the right side of the second light splitting sheet 22, an included angle between the side surface of the second light splitting sheet 22 and the third optical axis direction C is 45 °. The first light combining component 14 has a simple structure, so that the collimated light beams output by the first light source component 1 and the second light source component 2 can be transmitted along the first optical axis direction A only through one-time transmission or one-time reflection, and the energy loss of the light beams is small, thereby being beneficial to accurate and reliable detection.

The lens refractive index detection device in this embodiment differs from that in embodiment 3 in that: 1. the first focusing assembly 4 becomes a fixed structure; 2. the second light source component 2 is added, the second light source component 2 is utilized to adjust the center position of the measured lens 13 and calculate the focal power, and the first light source component 1 is used for detecting the space height difference and interference phenomenon of scattered light spots and calculating the refractive index.

In this embodiment, the spectrum width of the first monochromatic LED test light source 15 is 10nm to 50nm, and the center wavelength is 546nm; the spectrum width of the second single-color LED test light source 16 is 10 nm-50 nm, and the center wavelength is 546nm; the diameter of the first light transmission holes 17 is smaller than 0.5mm, preferably the diameter of the first light transmission holes 17 is smaller than 0.2mm, for example 0.15mm; the distance between the first light transmission hole 17 and the first single-color LED test light source 15 is smaller than 0.5mm, for example, 0.2mm; the diameter of the second light transmission holes 18 is smaller than 0.5mm, preferably the diameter of the second light transmission holes 18 is smaller than 0.2mm; the second light transmission hole 18 is spaced from the second monochromatic LED test light source 16 by less than 0.5mm, for example 0.2mm; the focal length of the first collimating lens 19 is greater than 50mm, preferably the focal length of the first collimating lens 19 is greater than 100mm; the focal length of the second collimating lens 20 is greater than 50mm, preferably the focal length of the second collimating lens 20 is greater than 100mm; the focal length of the focusing lens 25 is greater than 50mm, preferably the focal length of the focusing lens 25 is greater than 100mm; the transmittance and reflectance of the first light splitting sheet 21 to the 500-600nm light source assembly are 1:1.

before the measured lens 13 moves in, the first light source component 1 is closed, the second light source component 2 is opened, the collimated light beam transmitted by the second light source component 2 along the first optical axis direction A passes through the first light combining component 14, the light splitting component 10 and the Hartmann plate 30 and then enters the second photoelectric detection component 9, the second photoelectric detection component 9 detects the light spot array projected by the Hartmann plate 30, and the position of the light spot array is used as a reference position for the position adjustment and the focal power calculation of the subsequent measured lens 13; then the second light source component 2 is turned off, the first light source component 1 is turned on, the collimated light beam transmitted by the first light source component 1 along the third optical axis direction C is reflected by the first light combining component 14 and then transmitted along the first optical axis direction A, and is split into two beams by the light splitting component 10, and one beam is projected onto The second reflecting mirror 12 is reflected by the second reflecting mirror 12 to return in the original way, the other beam is projected onto the Hartmann plate 30 and reflected by the upper surface of the Hartmann plate 30 to return in the original way, and the two returned beams enter the first photoelectric detection assembly 8 through the beam splitting assembly 10 to be used for detecting interference phenomena, and the position d1 of the second reflecting mirror 12 when the interference phenomena occur is recorded; then the first light source component 1 is turned off, the second light source component 2 is turned on and moved into the measured lens 13, the second photoelectric detection component 9 monitors the projected actual light spot array, the center position of the lens is calculated according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1), and then a user is guided to adjust the position of the measured lens 13, so that the center of the measured lens 13 coincides with the center of the light path, and the position adjustment of the measured lens 13 is completed; meanwhile, the focal power of the measured lens 13 can be calculated according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1), and the center position and the focal power of the lens are calculated according to the deviation between the position of the actual light spot array and the reference position; then the second light source component 2 is closed, the first light source component 1 is opened, the position of the second reflecting mirror 12 is readjusted, when the interference phenomenon occurs again in the first photoelectric detection component 8, the difference value between the positions D2 and D1 of the second reflecting mirror 12 is related to the optical thickness of the center of the lens, meanwhile, the light beam output by the first light source component 1 is focused by the first focusing component 4 at the position of the measured lens 13, light scattering is generated on the upper surface and the lower surface of the measured lens 13, the scattered light on the upper surface and the lower surface of the measured lens 13 is imaged by the first imaging component 6 and the second imaging component 7 respectively, the space height of scattered light spots on the upper surface and the lower surface of the measured lens 13 is measured, and the space height difference of scattered light spots on the upper surface and the lower surface of the measured lens 13 is the physical thickness D0 of the center of the lens; then, the refractive index of the measured lens 13 is calculated according to the lens center physical thickness D0 and the lens center optical thickness related parameters D1 and D2, and the calculation formula is as follows:

The lens refractive index detection device acquires relevant parameters for calculating the refractive index by detecting the space height difference and interference phenomenon of scattered light spots generated on the upper surface and the lower surface of the detected lens 13 by focused light beams, does not need to manufacture a prism, does not need to detect relevant angles of the prism, is more convenient to operate, shortens the detection period, and can realize online rapid detection; the optical element to be detected is not damaged without manufacturing a prism, so that the method is also very suitable for detecting finished lenses; the detection of the space height difference and interference phenomenon of the scattered light spots is also suitable for irregular surface lenses such as an aspheric lens, a cylindrical lens and the like; the Hartmann plate 30 is also used to correct whether the center of the lens to be measured is aligned with the center of the optical path, and to detect the optical power according to the offset of the light spot array detected by the Hartmann plate 30.

Example 6:

a lens refractive index detection method based on the lens refractive index detection apparatus of example 5, comprising the steps of:

(1) Before the measured lens 13 moves in, the first light source component 1 is turned off, the second light source component 2 is turned on, the light spot array projected by the Hartmann plate 30 is detected by the second photoelectric detection component 9, and the position of the light spot array is used as a reference position for the position adjustment and focal power calculation of the subsequent measured lens 13;

(2) Turning off the second light source assembly 2, turning on the first light source assembly 1, detecting an interference phenomenon in the first photoelectric detection assembly 8, and recording the position d1 of the second reflecting mirror 12 when the interference phenomenon occurs;

(3) Turning off the first light source assembly 1, turning on the second light source assembly 2, moving into the measured lens 13, monitoring the projected actual light spot array by the second photoelectric detection assembly 9, calculating the center position of the lens at the moment according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1), and guiding a user to adjust the position of the measured lens 13, so that the center of the measured lens (13) coincides with the center of the light path, thus finishing the position adjustment of the measured lens 13; meanwhile, the focal power of the measured lens 13 can be calculated according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1);

(4) The second light source component 2 is closed, the first light source component 1 is opened, the position of the second reflecting mirror 12 is readjusted, when the interference phenomenon occurs again in the first photoelectric detection component 8, the difference value between the positions D2 and D1 of the second reflecting mirror 12 is related to the optical thickness of the center of the lens, meanwhile, the light beam output by the first light source component 1 is focused at the position of the measured lens 13 by the first focusing component 4, light scattering is generated on the upper surface and the lower surface of the measured lens 13, the scattered light on the upper surface and the lower surface of the measured lens 13 is imaged by the first imaging component 6 and the second imaging component 7 respectively, the space height of scattered light spots on the upper surface and the lower surface of the measured lens 13 is measured, and the space height difference of scattered light spots on the upper surface and the lower surface of the measured lens 13 is the physical thickness D0 of the center of the lens;

example 7:

the utility model provides a lens refractive index detection device, includes light source module, lens center physical thickness detection module and lens center optical thickness detection module, the light source module includes the first light source subassembly 1 and the second light source subassembly 2 that are used for exporting collimated light beam, third light source subassembly 3, first light combining subassembly 14, second light combining subassembly 29 and first focusing subassembly 4, lens center physical thickness detection module includes first imaging component 6 and second imaging component 7, lens center optical thickness detection module includes first photoelectric detection subassembly 8, second photoelectric detection subassembly 9, beam splitting subassembly 10, hartmann board 30, movable second speculum 12, the second photoelectric detection assembly 9, the hartmann plate 30, the light splitting assembly 10, the first focusing assembly 4, the first light combining assembly 14 and the first light source assembly 1 are sequentially arranged from front to back along the first optical axis direction a, the second reflecting mirror 12 is arranged on one side of the light splitting assembly 10, the first photoelectric detection assembly 8 is arranged on the other side of the light splitting assembly 10, the focal plane of the first focusing assembly 4 is positioned between the light splitting assembly 10 and the hartmann plate 30 and is used for placing the lens 13 to be measured, the first imaging assembly 6 and the second imaging assembly 7 are respectively arranged above and below the lens 13 to be measured, the upper surface of the hartmann plate 30 is coated with a reflecting film 32 for partially reflecting the light beam of the second light source assembly 2, and the lower surface of the hartmann plate 30 is provided with an array type light transmitting hole 31; the collimated light beam output by the first light source component 1 is transmitted along the first optical axis direction a after being transmitted through the first light combining component 14, and is focused at the measured lens 13 by the first focusing component 4, and meanwhile, scattered light spots are generated on the upper surface and the lower surface of the measured lens 13 and detected by the first imaging component 6 and the second imaging component 7; the third light source assembly 3 is located at the back focal point of the first focusing assembly 4, the light beams output by the third light source assembly 3 are sequentially reflected by the second light combining assembly 29 and the first light combining assembly 14, focused into parallel light beams by the first focusing assembly 4 and transmitted along the first optical axis direction a, and the parallel light beams transmitted by the third light source assembly 3 along the first optical axis direction a are transmitted through the tested lens 13 and the Hartmann plate 30 and then detected by the second photoelectric detection assembly 9 to be transmitted through the light spot array of the Hartmann plate 30; the collimated light beam output by the second light source assembly 2 is transmitted through the second light combining assembly 29 and is reflected by the first light combining assembly 14, and then is transmitted along the first optical axis direction a, and is split into two beams by the light splitting assembly 10, wherein one beam is projected onto the second reflecting mirror 12 and reflected by the second reflecting mirror 12 to return in the original path, and is further transmitted into the first photoelectric detection assembly 8 by the light splitting assembly 10, the other beam is projected onto the hartmann plate 30 and reflected by the upper surface of the hartmann plate 30 to return in the original path, and is also reflected into the first photoelectric detection assembly 8 by the light splitting assembly 10, and the two returned light beams enter the first photoelectric detection assembly 8 for detecting interference phenomena.

The light splitting assembly 10 includes a first light splitting sheet 21 with half-transmission and half-reflection, the center of the first photoelectric detection assembly 8, the center of the first light splitting sheet 21 and the center of the second reflecting mirror 12 are all located in a second optical axis direction B perpendicular to the first optical axis direction a, in this embodiment, the second reflecting mirror 12 is located on the right side of the first light splitting sheet 21, the included angle between the side surface of the first light splitting sheet 21 and the second optical axis direction B is 135 °, and of course, the second reflecting mirror 12 may also be located on the left side of the first light splitting sheet 21, so that the included angle between the side surface of the first light splitting sheet 21 and the second optical axis direction B is 45 °. The device has the advantages of few elements, simple structure and reliable optical path coupling.

The first light combining component 14 includes a semi-transparent and semi-reflective second light splitting sheet 22, the second light source component 2 and the third light source component 3 are disposed on the same side of the second light splitting sheet 22, and the second light combining component 29 includes a semi-transparent and semi-reflective third light splitting sheet 23 disposed between the second light splitting sheet 22 and the second light source component 2; the first light source component 1 is arranged behind the second light splitting piece 22, and the output collimated light beam is transmitted after being projected onto the second light splitting piece 22 along the first optical axis direction A; the collimated light beam output by the second light source assembly 2 is transmitted along a third optical axis direction C perpendicular to the first optical axis direction a, then is projected onto a third beam splitter 23 to be transmitted, and is reflected by the second beam splitter 22 to be transmitted along the first optical axis direction a; the light beam output by the third light source assembly 3 is transmitted along a fourth optical axis direction D perpendicular to the third optical axis direction C, and then is reflected by the third light-splitting sheet 23 and the second light-splitting sheet 22 in sequence and then transmitted along the first optical axis direction a; when the second light splitting sheet 22 and the third light splitting sheet 23 are both 45 ° with the third optical axis direction C, the second light source assembly 2 is located on the right side of the second light splitting sheet 22 and the third light source assembly 3 is located above the third optical axis direction C, when the second light splitting sheet 22 and the third light splitting sheet 23 are both 135 ° with the second optical axis direction B, the second light source assembly 2 is located on the left side of the second light splitting sheet 22 and the third light source assembly 3 is located above the third optical axis direction C, and when the second light splitting sheet 22 is 45 ° with the third optical axis direction C and the third light splitting sheet 23 is 135 ° with the third optical axis direction C, the second light source assembly 2 is located on the right side of the second light splitting sheet 22 and the third light source assembly 3 is located below the third optical axis direction C, and when the second light splitting sheet 22 is 135 ° with the third light splitting sheet 23 is 45 ° with the third optical axis direction C, the second light source assembly 2 is located on the left side of the second light splitting sheet 22 and the third light source assembly 3 is located below the third optical axis direction C. The first light combining component 14 and the second light combining component 29 have simple structures, so that the collimated light beams output by the first light source component 1 and the second light source component 2/the third light source component 3 can be transmitted along the first optical axis direction A only through simple transmission and/or reflection, and the energy loss of the light beams is small, thereby being beneficial to the accurate and reliable detection.

The first light source assembly 1 includes a semiconductor laser disposed behind the second beam splitter 22, and the output collimated light beam is transmitted after being projected onto the second beam splitter 22 along the first optical axis direction a. The semiconductor laser has small volume, light weight, reliable operation, low power consumption and high efficiency.

The second light source assembly 2 includes a first single-color LED test light source 15, where the first single-color LED test light source 15 may be in a patch package form, the first single-color LED test light source 15 may be green light of 530nm or 540nm, blue light of 450nm or 480nm, red light of 610nm or 630nm, etc., the first single-color LED test light source 15 may test the refractive index at which wavelength, a first light transmitting hole 17 is disposed in front of the first single-color LED test light source 15, a first collimating lens 19 is disposed in front of the first light transmitting hole 17, the first single-color LED test light source 15 is disposed at a back focal point of the first collimating lens 19, and is used to convert a light beam emitted by the first single-color LED test light source 15 through the first light transmitting hole 17 into a collimated light beam, where the collimated light beam output by the first single-color LED test light source 15 is transmitted through a third light splitter 23 along a third direction C perpendicular to the first optical axis direction a, and is reflected along the first optical axis a first direction a; the center of the second beam splitter 22, the center of the third beam splitter 23, the center of the first collimating lens 19, the center of the first light hole 17, and the center of the first single-color LED test light source 15 are all located in a third optical axis direction C perpendicular to the first optical axis direction a. The first monochromatic LED test light source 15 is low in cost, low in energy consumption and safer to use; converting the first monochromatic LED test light source 15 into a collimated beam may make the optical path coupling more reliable.

The third light source assembly 3 includes a second single-color LED test light source 16, where the second single-color LED test light source 16 may be in a patch package form, the second single-color LED test light source 16 may be the same as the first single-color LED test light source 15, may be green light with 530nm or 540nm, may be blue light with 450nm or 480nm, may also be red light with 610nm or 630nm, etc., a second light transmitting hole 18 is disposed in front of the second single-color LED test light source 16, and the second single-color LED test light source 16 is disposed on a rear focal point of the first focusing assembly 4, and is configured to convert a light beam emitted by the second single-color LED test light source 16 through the second light transmitting hole 18 into a collimated light beam through the first focusing assembly 4, where the collimated light beam output by the second single-color LED test light source 16 is projected onto the third light splitting sheet 23 along a fourth optical axis direction D perpendicular to the third optical axis direction C, and is sequentially reflected twice by the third light splitting sheet 23 and the second light splitting sheet 22, and is transmitted along the first optical axis direction a; the center of the third light splitting sheet 23, the center of the second light transmitting hole 18 and the center of the second single-color LED test light source 16 are all located in the fourth optical axis direction D perpendicular to the third optical axis direction C. The second monochromatic LED test light source 16 has low cost, low energy consumption and safer use; the second monochromatic LED test light source 16 is converted to a collimated beam for power calculation.

The first focusing assembly 4 comprises a focusing lens 25. The arrangement is simple in structure.

In this embodiment, the diameter of the collimated beam output by the semiconductor laser is smaller than 3mm, for example, 1.5mm, and the wavelength is larger than 650nm; the spectrum width of the first single-color LED test light source 15 is 10 nm-50 nm, and the center wavelength is 546nm; the spectrum width of the second single-color LED test light source 16 is 10 nm-50 nm, and the center wavelength is 546nm; the diameter of the first light holes 17 is smaller than 0.5mm, preferably the diameter of the first light holes 17 is smaller than 0.2mm; the distance between the first light transmission hole 17 and the first single-color LED test light source 15 is smaller than 0.5mm, for example, 0.2mm; the diameter of the second light transmission holes 18 is smaller than 0.5mm, preferably the diameter of the second light transmission holes 18 is smaller than 0.2mm; the second light transmission hole 18 is spaced from the second monochromatic LED test light source 16 by less than 0.5mm, for example 0.2mm; the focal length of the first collimating lens 19 is greater than 50mm, preferably the focal length of the first collimating lens 19 is greater than 100mm; the focal length of the focusing lens 25 is greater than 50mm, preferably the focal length of the focusing lens 25 is greater than 100mm; the distance from the second light hole 18 to the focusing lens 25 is equal to the focal length of the focusing lens 25; the transmittance and reflectance of the first beam splitter 21 and the fourth beam splitter 24 to the light beam of the single-color LED test light source are 1:1, the transmittance and reflectance of the light beam of the semiconductor laser are greater than the reflectance, and the transmittance and reflectance of the second beam splitter 22 and the third beam splitter 23 to the light beam of the single-color LED test light source are 1:1.

The working principle of the lens refractive index detection device of the embodiment is as follows:

before the measured lens 13 moves in, the first light source component 1 and the second light source component 2 are closed, the third light source component 3 is opened, the second photoelectric detection component 9 detects the light spot array transmitted by the Hartmann plate 30, and the position of the light spot array is used as a reference position for the position adjustment and focal power calculation of the subsequent measured lens 13; turning off the third light source assembly 3, turning on the second light source assembly 2, detecting an interference phenomenon by the first photoelectric detection assembly 8, and recording the position d1 of the second reflecting mirror 12 when the interference phenomenon occurs; turning off the second light source assembly 2, turning on the third light source assembly 3, moving into the measured lens 13, monitoring the projected actual light spot array by the second photoelectric detection assembly 9, calculating the center position of the lens at the moment according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1), and guiding a user to adjust the position of the measured lens 13, so that the center of the measured lens 13 coincides with the center of the optical path, thus finishing the position adjustment of the measured lens 13; meanwhile, the focal power of the measured lens 13 can be calculated according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1); the third light source component 3 is closed, the first light source component 1 is opened, the light beam output by the first light source component 1 is focused at the position of the measured lens 13 by the first focusing component 4, light scattering is generated on the upper surface and the lower surface of the measured lens 13, the scattered light on the upper surface and the lower surface of the measured lens 13 is imaged by the first imaging component 6 and the second imaging component 7 respectively, the space height of scattered light spots on the upper surface and the lower surface of the measured lens 13 is measured, and the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens 13 is the physical thickness D0 of the center of the lens; turning off the first light source assembly 1, turning on the second light source assembly 2, readjusting the position of the second reflecting mirror 12, and recording the position d2 of the second reflecting mirror 12 when the interference phenomenon occurs again in the first photoelectric detection assembly 8, wherein the difference between d2 and d1 is related to the optical thickness of the center of the lens; the refractive index of the measured lens 13 is calculated according to the lens center physical thickness D0 and the lens center optical thickness related parameters D1 and D2, and the calculation formula is as follows: n=1+ (D2-D1)/D0.

The lens refractive index detection device acquires relevant parameters for calculating the refractive index by detecting the space height difference and interference phenomenon of scattered light spots generated on the upper surface and the lower surface of the detected lens 13 by focused light beams, does not need to manufacture a prism, does not need to detect relevant angles of the prism, is more convenient to operate, shortens the detection period, and can realize online rapid detection; the optical element to be detected is not damaged without manufacturing a prism, so that the method is also very suitable for detecting finished lenses; the detection of the space height difference and interference phenomenon of the scattered light spots is also suitable for irregular surface lenses such as an aspheric lens, a cylindrical lens and the like; in addition, two groups of light source components are respectively arranged and matched with the Hartmann plate 30 to correct whether the center of the lens to be detected is aligned with the center of the light path, and the focal power is detected according to the deviation condition of the light spot array detected by the Hartmann plate 30.

Example 8:

a lens refractive index detection method based on the lens refractive index detection apparatus of example 7, comprising the steps of:

(1) Before the measured lens 13 moves in, the first light source component 1 and the second light source component 2 are closed, the third light source component 3 is opened, the second photoelectric detection component 9 detects the light spot array transmitted by the Hartmann plate 30, and the position of the light spot array is used as a reference position for the position adjustment and focal power calculation of the subsequent measured lens 13;

(3) Turning off the third light source assembly 3, turning on the second light source assembly 2, detecting an interference phenomenon by the first photoelectric detection assembly 8, and recording the position d1 of the second reflecting mirror 12 when the interference phenomenon occurs;

(4) Turning off the second light source assembly 2, turning on the third light source assembly 3, moving into the measured lens 13, monitoring the projected actual light spot array by the second photoelectric detection assembly 9, calculating the center position of the lens at the moment according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1), and guiding a user to adjust the position of the measured lens 13, so that the center of the measured lens 13 coincides with the center of the optical path, thus finishing the position adjustment of the measured lens 13; meanwhile, the focal power of the measured lens 13 can be calculated according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1);

(5) The third light source component 3 is closed, the first light source component 1 is opened, the light beam output by the first light source component 1 is focused at the position of the measured lens 13 by the first focusing component 4, light scattering is generated on the upper surface and the lower surface of the measured lens 13, the scattered light on the upper surface and the lower surface of the measured lens 13 is imaged by the first imaging component 6 and the second imaging component 7 respectively, the space height of scattered light spots on the upper surface and the lower surface of the measured lens 13 is measured, and the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens 13 is the physical thickness D0 of the center of the lens;

(6) Turning off the first light source assembly 1, turning on the second light source assembly 2, readjusting the position of the second reflecting mirror 12, and recording the position d2 of the second reflecting mirror 12 when the interference phenomenon occurs again in the first photoelectric detection assembly 8, wherein the difference between d2 and d1 is related to the optical thickness of the center of the lens;

(7) The refractive index of the measured lens 13 is calculated according to the lens center physical thickness D0 and the lens center optical thickness related parameters D1 and D2, and the calculation formula is as follows: n=1+ (D2-D1)/D0.

Claims

1. The utility model provides a lens refracting index detection device which characterized in that: the device comprises a light source module, a lens center physical thickness detection module and a lens center optical thickness detection module, wherein the light source module comprises a first light source component (1) for outputting a collimated light beam and a first focusing component (4), the lens center physical thickness detection module comprises a first imaging component (6) and a second imaging component (7), the lens center optical thickness detection module comprises a first photoelectric detection component (8), a second photoelectric detection component (9), a beam splitting component (10), a partially-reflecting first reflecting mirror (11) and a movable second reflecting mirror (12), the second photoelectric detection component (9), the first reflecting mirror (11), the beam splitting component (10), the first focusing component (4) and the first light source component (1) are sequentially arranged from front to back along a first optical axis direction (A), the movable second reflecting mirror (12) is arranged on one side of the beam splitting component (10), the first photoelectric detection component (8) is arranged on the other side of the beam splitting component (10), a light focusing surface of the first focusing component (4) is positioned between the first reflecting mirror (10) and the first focusing component (11) and the first imaging component (13) which are arranged below the first focusing component (7) and is arranged below the first imaging component (13), the light beam transmitted by the first light source component (1) along the first optical axis direction (A) is focused at a measured lens (13) through a first focusing component (4), scattered light spots are generated on the upper surface and the lower surface of the measured lens (13) and detected by a first imaging component (6) and a second imaging component (7), the focused light beam of the first light source component (1) is also partially transmitted into a second photoelectric detection component (9) through a first reflecting mirror (11), the light beam transmitted by the first light source component (1) along the first optical axis direction (A) is further divided into two beams through a light splitting component (10), one beam is projected onto the second reflecting mirror (12) and reflected by the second reflecting mirror (12) to return in a primary way, the other beam is further projected onto the first reflecting mirror (11) and reflected by the first reflecting mirror (11) to return in a primary way, the light beam is also reflected into the first photoelectric detection component (8) through the light splitting component (10), and the two beams enter the first photoelectric detection component (8) to detect interference phenomena; before the lens (13) to be tested is placed, the second photoelectric detection assembly (9) is used for monitoring the central position of a light spot of the collimated light beam and taking the light spot as a reference position, the first photoelectric detection assembly (8) is used for detecting an interference phenomenon, and when the interference phenomenon occurs, the position of the second reflecting mirror (12) is recorded as d1; when the measured lens (13) is placed, the second photoelectric detection assembly (9) is used for monitoring the actual spot center position of the collimated light beam of the first light source assembly (1) and comparing the actual spot center position with the reference position, so that the position of the measured lens (13) is adjusted to enable the actual spot center position of the collimated light beam to coincide with the reference position; the first imaging component (6) and the second imaging component (7) respectively image scattered light on the upper surface and the lower surface of the measured lens (13) so that the space height of scattered light spots on the upper surface and the lower surface of the measured lens (13) is measured, and the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens (13) is recorded as the physical thickness D0 of the center of the lens; when the position of the second reflecting mirror (12) is readjusted to generate interference phenomenon again, the position of the second reflecting mirror (12) is marked as d2, and the refractive index calculation formula of the measured lens (13) is as follows: n=1+ (D2-D1)/D0.

2. The lens refractive index detection apparatus according to claim 1, wherein: the light reflectivity of the first reflecting mirror (11) is larger than the light transmittance, a second polymer Jiao Zujian (5) is further arranged between the first reflecting mirror (11) and the second photoelectric detection assembly (9) and used for converging light beams transmitted by the first light source assembly (1) through the first reflecting mirror (11), and the light reflectivity and the light transmittance are both light beams emitted by the first light source assembly (1).

3. The lens refractive index detection apparatus according to claim 1, wherein: the first light source assembly (1) comprises a first single-color LED test light source (15), a first light hole (17) is formed in front of the first single-color LED test light source (15), a first collimating lens (19) is arranged in front of the first light hole (17), the first single-color LED test light source (15) is arranged on a rear focal point of the first collimating lens (19) and is used for enabling light beams emitted by the first single-color LED test light source (15) through the first light hole (17) to be converted into collimated light beams after passing through the first collimating lens (19) and then to be projected onto the first focusing assembly (4).

4. A lens refractive index detection apparatus according to claim 3, wherein: the light splitting assembly (10) comprises a semi-transparent and semi-reflective first light splitting sheet (21), the first focusing assembly (4) comprises a focusing lens (25), the center of the first light splitting sheet (21), the center of the focusing lens (25), the center of the first collimating lens (19), the center of the first light transmitting hole (17) and the center of the first monochromatic LED test light source (15) are all located in a first optical axis direction (A), the center of the second reflecting mirror (12), the center of the first light splitting sheet (21) and the center of the first photoelectric detection assembly (8) are all located in a second optical axis direction (B) perpendicular to the first optical axis direction (A), when the second reflecting mirror (12) is located at the left side of the first light splitting sheet (21), the included angle between the side surface of the first light splitting sheet (21) and the second optical axis direction (B) is 45 degrees, and when the second reflecting mirror (12) is located at the right side of the first light splitting sheet (21), the included angle between the side surface of the first light splitting sheet (21) and the second optical axis direction (135 degrees.

5. The lens refractive index detection apparatus according to claim 1, wherein: the first imaging component (6) and the second imaging component (7) are cameras (27) with oblique imaging lenses (26), and the object image conjugate relation of oblique imaging of the imaging lenses is met by the included angle of the optical axis direction of the oblique imaging lenses (26) relative to the first optical axis direction (A) and the included angle of the optical axis direction of the oblique imaging lenses (26) relative to the imaging chip plane of the cameras (27).

6. The utility model provides a lens refracting index detection device which characterized in that: the system comprises a light source module, a lens center physical thickness detection module and a lens center optical thickness detection module, wherein the light source module comprises a first light source component (1) for outputting a collimated light beam and a removable first focusing component (4), the lens center physical thickness detection module comprises a first imaging component (6) and a second imaging component (7), the lens center optical thickness detection module comprises a first photoelectric detection component (8), a second photoelectric detection component (9), a beam splitting component (10), a Hartmann plate (30) and a movable second reflecting mirror (12), the second photoelectric detection component (9), the Hartmann plate (30), the beam splitting component (10), the removable first focusing component (4) and the first light source component (1) are sequentially arranged from front to back along a first optical axis direction (A), a reflecting film (32) is coated on the upper surface of the Hartmann plate (30) for partially reflecting the light beam of the first light source component (1), an array hole (31) is formed in the lower surface of the Hartmann plate (30) for partially reflecting the light beam of the first light source component (1), the array hole (31) is formed in the lower surface of the Hartmann plate (30) for projecting the second photoelectric detection component (9) to the second photoelectric detection component (10), the movable photoelectric detection component (10) is arranged on the other side of the first photoelectric detection component (10) and the first focusing component (10) is arranged on the other side, the focal plane of the first focusing component (4) is positioned between the beam splitting component (10) and the Hartmann plate (30) and used for placing a lens (13) to be tested, the first imaging component (6) and the second imaging component (7) are respectively arranged above and below the lens (13) to be tested, when the first focusing component (4) is removed, the collimated light beam transmitted by the first light source component (1) along the first optical axis direction (A) is transmitted by the beam splitting component (10) and then projected onto the lens (13) to be tested and the Hartmann plate (30) and enters the second photoelectric detection component (9), the second photoelectric detection component (9) detects a light spot array projected by the Hartmann plate (30), after the first focusing component (4) is inserted, the collimated light beam transmitted by the first light source component (1) along the first optical axis direction (A) is transmitted by the beam splitting component (10) and focused by the first focusing component (4) at the lens (13) to be tested, meanwhile, the upper and lower surfaces of the lens (13) to be tested are scattered and the first imaging component (6) is reflected by the first reflecting component (12) and then reflected by the first reflecting component (12) along the first optical axis (12), the light is further transmitted into the first photoelectric detection component (8) through the light splitting component (10), the other beam is projected onto the Hartmann plate (30) and reflected by the upper surface of the Hartmann plate (30) to return in an original way, and the light is also reflected into the first photoelectric detection component (8) through the light splitting component (10), and the two returned light beams enter the first photoelectric detection component (8) for detecting interference phenomena; before the measured lens (13) and the first focusing assembly (4) move in, the first light source assembly (1) is turned on, the second photoelectric detection assembly (9) is used for detecting a light spot array projected by the Hartmann plate (30), and the position of the light spot array is recorded as a reference position; moving into a first focusing assembly (4), wherein the first photoelectric detection assembly (8) is used for detecting interference phenomena, and when the interference phenomena occur, the position of the second reflecting mirror (12) is marked as d1; removing a first focusing assembly (4) and moving into a measured lens (13), wherein the second photoelectric detection assembly (9) is used for monitoring an actual light spot array, and adjusting the position of the measured lens (13) according to the offset between the position of the actual light spot array and the reference position so that the center of the measured lens (13) coincides with the center of a light path; and then moving into the first focusing assembly (4), when the second reflecting mirror (12) is adjusted and the interference phenomenon occurs again, marking the position of the second reflecting mirror (12) as D2, respectively imaging scattered light on the upper surface and the lower surface of the measured lens (13) by the first imaging assembly (6) and the second imaging assembly (7), so that the space heights of scattered light spots on the upper surface and the lower surface of the measured lens (13) are measured, marking the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens (13) as the physical thickness D0 of the center of the lens, and calculating the refractive index of the measured lens (13) to obtain the formula n=1+ (D2-D1)/D0.

7. The lens refractive index detection apparatus according to claim 6, wherein: the first light source assembly (1) comprises a first single-color LED test light source (15), a first light hole (17) is formed in front of the first single-color LED test light source (15), a first collimating lens (19) is arranged in front of the first light hole (17), the first single-color LED test light source (15) is arranged on a rear focal point of the first collimating lens (19) and is used for enabling light beams emitted by the first single-color LED test light source (15) through the first light hole (17) to be converted into collimated light beams after passing through the first collimating lens (19) and then to be projected onto the first focusing assembly (4).

8. The lens refractive index detection apparatus according to claim 7, wherein: the light splitting assembly (10) comprises a semi-transparent and semi-reflective first light splitting sheet (21), the first focusing assembly (4) comprises a focusing lens (25), the center of the first light splitting sheet (21), the center of the focusing lens (25), the center of the first collimating lens (19), the center of the first light transmitting hole (17) and the center of the first monochromatic LED test light source (15) are all located in a first optical axis direction (A), the center of the second reflecting mirror (12), the center of the first light splitting sheet (21) and the center of the first photoelectric detection assembly (8) are all located in a second optical axis direction (B) perpendicular to the first optical axis direction (A), when the second reflecting mirror (12) is located at the left side of the first light splitting sheet (21), the included angle between the side surface of the first light splitting sheet (21) and the second optical axis direction (B) is 45 degrees, and when the second reflecting mirror (12) is located at the right side of the first light splitting sheet (21), the included angle between the side surface of the first light splitting sheet (21) and the second optical axis direction (135 degrees.

9. The utility model provides a lens refracting index detection device which characterized in that: the system comprises a light source module, a lens center physical thickness detection module and a lens center optical thickness detection module, wherein the light source module comprises a first light source component (1) and a second light source component (2) which are used for outputting collimated light beams, a first focusing component (4) and a first light combining component (14), the lens center physical thickness detection module comprises a first imaging component (6) and a second imaging component (7), the lens center optical thickness detection module comprises a first photoelectric detection component (8), a second photoelectric detection component (9), a light splitting component (10), a Hartmann plate (30) and a movable second reflecting mirror (12), the second photoelectric detection component (9), the Hartmann plate (30), the light splitting component (10), the first focusing component (14) and the second light source component (2) are sequentially arranged from front to back along a first optical axis direction (A), the first light source component (1) is arranged on one side of the first light combining component (14), the first focusing component (4) is arranged between the first light source component (1) and the first light combining component (14), the light reflecting plate (30) is used for projecting light beams to a light transmitting array (30) of the first reflecting plate (30) on the surface of the first light beam reflecting plate (30), the movable second reflecting mirror (12) is arranged on one side of the light splitting component (10), the first photoelectric detection component (8) is arranged on the other side of the light splitting component (10), the focal plane of the first focusing component (4) is positioned between the light splitting component (10) and the Hartmann plate (30) and used for placing the measured lens (13), the first imaging component (6) and the second imaging component (7) are respectively arranged above and below the measured lens (13), the light beam output by the first light source component (1) is reflected by the first light combining component (14) and then transmitted along the first optical axis direction (A), and is focused by the first focusing component (4) at the measured lens (13), scattered light spots are generated on the upper surface and the lower surface of the measured lens (13) and are detected by the first imaging component (6) and the second imaging component (7), the light beam transmitted by the first light source component (1) along the first optical axis direction (A) is further divided into two beams by the light splitting component (10), the first beam is reflected by the second light combining component (14) and then transmitted by the second light source component (12) and returns to the Hartmann plate (30), the light beam is further transmitted by the first light combining component (12) and returns to the Hartmann plate (30), the light beams are reflected into the first photoelectric detection component (8) through the light splitting component (10), two returned light beams enter the first photoelectric detection component (8) for detecting interference phenomena, the collimated light beams transmitted by the second light source component (2) along the first optical axis direction (A) are transmitted to the second photoelectric detection component (9) after being transmitted through the first light combining component (14), the light splitting component (10), the detected lens (13) and the Hartmann plate (30), and the light spot array projected by the Hartmann plate (30) is detected by the second photoelectric detection component (9); before the lens (13) to be tested is moved in, the first light source component (1) is closed, the second light source component (2) is opened, the second photoelectric detection component (9) is used for detecting a light spot array projected by the Hartmann plate (30), and the position of the light spot array is recorded as a reference position; the second light source component (2) is turned off, the first light source component (1) is turned on, the first photoelectric detection component (8) is used for detecting interference phenomena, and when the interference phenomena occur, the position of the second reflecting mirror (12) is marked as d1; the first light source component (1) is closed, the second light source component (2) is opened, the second light source component is moved into the measured lens (13), the second photoelectric detection component (9) is used for monitoring the actual light spot array, and the position of the measured lens (13) is adjusted according to the offset between the position of the actual light spot array and the reference position, so that the center of the measured lens (13) coincides with the center of the light path; the method comprises the steps of closing a second light source assembly (2), opening a first light source assembly (1), recording the position of a second reflecting mirror (12) as D2 when the second reflecting mirror (12) is adjusted and an interference phenomenon occurs again, respectively imaging scattered light on the upper surface and the lower surface of a measured lens (13) by a first imaging assembly (6) and a second imaging assembly (7), measuring the scattered light spot space height of the upper surface and the scattered light spot space height of the lower surface of the measured lens (13), recording the scattered light spot space height difference of the upper surface and the scattered light spot space height difference of the lower surface of the measured lens (13) as a lens center physical thickness D0, and calculating the refractive index of the measured lens (13) according to a formula n=1+ (D2-D1)/D0.

10. The lens refractive index detection apparatus according to claim 9, wherein: the first light source assembly (1) comprises a first single-color LED test light source (15), a first light hole (17) is formed in front of the first single-color LED test light source (15), a first collimating lens (19) is arranged in front of the first light hole (17), the first single-color LED test light source (15) is arranged on a rear focal point of the first collimating lens (19) and is used for enabling light beams emitted by the first single-color LED test light source (15) through the first light hole (17) to be converted into collimated light beams after passing through the first collimating lens (19) and then to be projected onto the first focusing assembly (4).

11. The lens refractive index detection apparatus according to claim 10, wherein: the second light source assembly (2) comprises a second single-color LED test light source (16), a second light hole (18) is formed in front of the second single-color LED test light source (16), a second collimating lens (20) is arranged in front of the second light hole (18), and the second single-color LED test light source (16) is arranged on a rear focal point of the second collimating lens (20) and used for changing light beams emitted by the second single-color LED test light source (16) through the second light hole (18) into collimated light beams after passing through the second collimating lens (20).

12. The lens refractive index detection apparatus according to claim 9, wherein: the light splitting assembly (10) comprises a semi-transparent and semi-reflective first light splitting sheet (21), the center of the second reflecting mirror (12), the center of the first light splitting sheet (21) and the center of the first photoelectric detection assembly (8) are all located in a second optical axis direction (B) perpendicular to the first optical axis direction (A), when the second reflecting mirror (12) is located on the left side of the first light splitting sheet (21), an included angle between the side surface of the first light splitting sheet (21) and the second optical axis direction (B) is 45 degrees, and when the second reflecting mirror (12) is located on the right side of the first light splitting sheet (21), an included angle between the side surface of the first light splitting sheet (21) and the second optical axis direction (B) is 135 degrees.

13. The lens refractive index detection apparatus according to claim 11, wherein: the first light combining component (14) comprises a semi-transparent semi-reflective second light splitting piece (22), the first focusing component (4) comprises a focusing lens (25), the center of the first single-color LED test light source (15), the center of the first light transmitting hole (17), the center of the first collimating lens (19), the center of the focusing lens (25) and the center of the second light splitting piece (22) are all located in a third optical axis direction (C) perpendicular to the first optical axis direction (A), the center of the second single-color LED test light source (16), the center of the second light transmitting hole (18), the center of the second collimating lens (20) and the center of the second light splitting piece (22) are all located in the first optical axis direction (A), when the first single-color LED test light source (15) is located on the left side of the second light splitting piece (22), the included angle between the side surface of the second light splitting piece (22) and the third optical axis direction (C) is 135 degrees, and when the first single-color LED test light source (15) is located on the right side of the second light splitting piece (22), the included angle between the side surface of the second single-color LED test light source (22) and the third light splitting piece (C) is 45 degrees.

14. The utility model provides a lens refracting index detection device which characterized in that: the optical system comprises a light source module, a lens center physical thickness detection module and a lens center optical thickness detection module, wherein the light source module comprises a first light source component (1) and a second light source component (2) which are used for outputting collimated light beams, a third light source component (3), a first light combining component (14), a second light combining component (29) and a first focusing component (4), the lens center physical thickness detection module comprises a first imaging component (6) and a second imaging component (7), the lens center optical thickness detection module comprises a first photoelectric detection component (8), a second photoelectric detection component (9), a light splitting component (10), a Hartmann plate (30) and a movable second reflecting mirror (12), the second photoelectric detection component (9), the Hartmann plate (30), the light splitting component (10), the first focusing component (4), the first light combining component (14) and the first light source component (1) are sequentially arranged from front to back along a first optical axis direction (A), the second reflecting mirror (12) is arranged on one side of the light splitting component (10), the first photoelectric detection component (8) is arranged between the first photoelectric detection component (10) and the light splitting component (10) and the first focusing component (10) and the Hartmann plate (10) are arranged on the other side, the first imaging component (6) and the second imaging component (7) are respectively arranged above and below the lens (13) to be measured, the upper surface of the Hartmann plate (30) is coated with a reflecting film (32) for partially reflecting the light beam of the second light source component (2), and the lower surface of the Hartmann plate (30) is provided with an array light hole (31); the collimated light beam output by the first light source assembly (1) is transmitted along the first optical axis direction (A) after being transmitted through the first light combining assembly (14), and is focused at the position of the lens (13) to be detected by the first focusing assembly (4), and meanwhile, scattered light spots are generated on the upper surface and the lower surface of the lens (13) to be detected by the first imaging assembly (6) and the second imaging assembly (7); the third light source assembly (3) is positioned on the rear focal point of the first focusing assembly (4), light beams output by the third light source assembly (3) are sequentially reflected by the second light combining assembly (29) and the first light combining assembly (14), focused into parallel light beams by the first focusing assembly (4) and transmitted along the first optical axis direction (A), and the parallel light beams transmitted by the third light source assembly (3) along the first optical axis direction (A) are transmitted through the lens (13) to be tested and the Hartmann plate (30) and then detected by the second photoelectric detection assembly to be transmitted through the light spot array of the Hartmann plate (30); the collimated light beam output by the second light source assembly (2) is transmitted through the second light combining assembly (29) and is reflected by the first light combining assembly (14) and then transmitted along the first optical axis direction (A), and is divided into two beams by the light splitting assembly (10), wherein one beam is projected onto the second reflecting mirror (12) and is reflected by the second reflecting mirror (12) to be returned in an original path, the other beam is further transmitted to the first photoelectric detection assembly (8) through the light splitting assembly (10), is projected onto the Hartmann plate (30) and is reflected by the upper surface of the Hartmann plate (30) to be returned in an original path, and is also reflected to the first photoelectric detection assembly (8) through the light splitting assembly (10), and the two returned light beams enter the first photoelectric detection assembly (8) to be used for detecting interference phenomena; before the lens (13) to be tested is moved in, the first light source assembly (1) and the second light source assembly (2) are closed, the third light source assembly (3) is opened, the second photoelectric detection assembly (9) is used for detecting a light spot array projected by the Hartmann plate (30), and the position of the light spot array is recorded as a reference position; the third light source component (3) is turned off, the second light source component (2) is turned on, the first photoelectric detection component (8) is used for detecting interference phenomena, and when the interference phenomena occur, the position of the second reflecting mirror (12) is marked as d1; the second light source assembly (2) is closed, the third light source assembly (3) is opened, the second photoelectric detection assembly (9) is moved into the measured lens (13), the second photoelectric detection assembly is used for monitoring the actual light spot array, and the position of the measured lens (13) is adjusted according to the offset between the position of the actual light spot array and the reference position, so that the center of the measured lens (13) coincides with the center of the light path; the third light source component (3) is closed, the first light source component (1) is opened, the first imaging component (6) and the second imaging component (7) respectively image scattered light on the upper surface and the lower surface of the measured lens (13), so that the space heights of scattered light spots on the upper surface and the lower surface of the measured lens (13) are measured, and the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens (13) is recorded as the physical thickness D0 of the center of the lens; and turning off the first light source assembly (1), turning on the second light source assembly (2), and recording the position of the second reflecting mirror (12) as D2 when the second reflecting mirror (12) is adjusted and the interference phenomenon occurs again, wherein the refractive index of the measured lens (13) is calculated as n=1+ (D2-D1)/D0.

15. The lens refractive index sensing device of claim 14, wherein: the light splitting assembly (10) comprises a semi-transparent and semi-reflective first light splitting sheet (21), the center of the first photoelectric detection assembly (8), the center of the first light splitting sheet (21) and the center of the second reflecting mirror (12) are all located in a second optical axis direction (B) perpendicular to the first optical axis direction (A), when the second reflecting mirror (12) is located on the right side of the first light splitting sheet (21), an included angle between the side face of the first light splitting sheet (21) and the second optical axis direction (B) is 135 degrees, and when the second reflecting mirror (12) is located on the left side of the first light splitting sheet (21), an included angle between the side face of the first light splitting sheet (21) and the second optical axis direction (B) is 45 degrees.

16. The lens refractive index sensing device of claim 14, wherein: the first light combining component (14) comprises a semi-transparent and semi-reflective second light splitting sheet (22), the second light source component (2) and the third light source component (3) are arranged on the same side of the second light splitting sheet (22), and the second light combining component (29) comprises a semi-transparent and semi-reflective third light splitting sheet (23) arranged between the second light splitting sheet (22) and the second light source component (2); the first light source component (1) is arranged behind the second light splitting piece (22), and the output collimated light beam is transmitted after being projected onto the second light splitting piece (22) along the first optical axis direction (A); the collimated light beam output by the second light source assembly (2) is transmitted along a third optical axis direction (C) perpendicular to the first optical axis direction (A), then is projected onto a third light splitting sheet (23) and transmitted, and is reflected by a second light splitting sheet (22) and transmitted along the first optical axis direction (A); the light beam output by the third light source assembly (3) is transmitted along a fourth optical axis direction (D) perpendicular to the third optical axis direction (C), and then is transmitted along a first optical axis direction (A) after being reflected by a third light-splitting sheet (23) and a second light-splitting sheet (22) in sequence; when the second light splitting sheet (22) and the third light splitting sheet (23) are both 45 degrees with the third optical axis direction (C), the second light source assembly (2) is located on the right side of the second light splitting sheet (22) and the third light source assembly (3) is located above the third optical axis direction (C), when the second light splitting sheet (22) and the third light splitting sheet (23) are both 135 degrees with the second optical axis direction (B), the second light source assembly (2) is located on the left side of the second light splitting sheet (22) and the third light source assembly (3) is located above the third optical axis direction (C), when the second light splitting sheet (22) is 45 degrees with the third optical axis direction (C) and the third light splitting sheet (23) is 135 degrees with the third optical axis direction (C), the second light source assembly (2) is located on the right side of the second light splitting sheet (22) and the third light source assembly (3) is located below the third optical axis direction (C), and when the second light splitting sheet (22) is located on the left side of the third light splitting sheet (135 degrees with the third light splitting sheet (23) and the third light source assembly is located on the third optical axis direction (2).

17. The lens refractive index sensing device of claim 16, wherein: the first light source assembly (1) comprises a semiconductor laser, the semiconductor laser is arranged behind the second light splitting piece (22), and the output collimated light beam is transmitted after being projected onto the second light splitting piece (22) along the first optical axis direction (A).

18. The lens refractive index sensing device of claim 16, wherein: the second light source assembly (2) comprises a first single-color LED test light source (15), a first light transmission hole (17) is formed in front of the first single-color LED test light source (15), a first collimating lens (19) is arranged in front of the first light transmission hole (17), the first single-color LED test light source (15) is arranged on a rear focal point of the first collimating lens (19) and is used for converting a light beam emitted by the first single-color LED test light source (15) through the first light transmission hole (17) into a collimated light beam through the first collimating lens (19), and the collimated light beam output by the first single-color LED test light source (15) is transmitted through the third light splitting piece (23) along a third optical axis direction (C) perpendicular to the first optical axis direction (A) and is transmitted along the first optical axis direction (A) after being reflected by the second light splitting piece (22); the center of the second light splitting sheet (22), the center of the third light splitting sheet (23), the center of the first collimating lens (19), the center of the first light transmitting hole (17) and the center of the first single-color LED test light source (15) are all located in a third optical axis direction (C) perpendicular to the first optical axis direction (A).

19. The lens refractive index sensing device of claim 16, wherein: the third light source assembly (3) comprises a second single-color LED test light source (16), a second light transmission hole (18) is formed in front of the second single-color LED test light source (16), the second single-color LED test light source (16) is arranged on the rear focal point of the first focusing assembly (4) and is used for converting a light beam emitted by the second single-color LED test light source (16) through the second light transmission hole (18) into a collimated light beam through the first focusing assembly (4), and the collimated light beam output by the second single-color LED test light source (16) is projected onto the third light splitting sheet (23) along a fourth optical axis direction (D) perpendicular to the third optical axis direction (C) and is sequentially transmitted along the first optical axis direction (A) after being reflected twice by the third light splitting sheet (23) and the second light splitting sheet (22); the center of the third light splitting sheet (23), the center of the second light transmitting hole (18) and the center of the second single-color LED test light source (16) are all located in a fourth optical axis direction (D) perpendicular to the third optical axis direction (C).

20. A method for detecting refractive index of a lens, wherein the method is applied to a lens refractive index detecting device according to any one of claims 1 to 5, the method comprising the steps of:

(1) Before the lens (13) to be tested is inserted, the first light source component (1) is turned on, and the second photoelectric detection component (9) monitors the light spot center position of the light beam of the first light source component (1) and takes the light spot center position as a reference position;

(2) Detecting an interference phenomenon by the first photoelectric detection component (8) and recording the position d1 of the second reflecting mirror (12) when the interference phenomenon occurs in the first photoelectric detection component (8);

(3) Inserting a measured lens (13), monitoring the actual spot center position of the light beam of the first light source assembly (1) by the second photoelectric detection assembly (9), comparing the actual spot center position with the reference position obtained in the step (1), guiding a user to adjust the position of the measured lens (13) according to the deviation of the actual spot center position and the reference position, and when the actual spot center position of the light beam of the first light source assembly (1) is overlapped with the reference position, overlapping the center of the measured lens (13) with the center of the light path, so as to finish the position adjustment of the measured lens (13);

(4) The first imaging component (6) and the second imaging component (7) respectively image scattered light on the upper surface and the lower surface of the measured lens (13) to realize the measurement of the space height of scattered light spots on the upper surface and the lower surface of the measured lens (13), and the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens (13) is the physical thickness D0 of the center of the lens;

(5) Readjusting the position of the second mirror (12) and recording the position d2 of the second mirror (12) when the interference phenomenon occurs again in the first photodetection element (8);

(6) According to the physical thickness D0 of the lens center and the related parameters D1 and D2 of the optical thickness of the lens center, the refractive index of the measured lens (13) is calculated, and the calculation formula is as follows: n=1+ (D2-D1)/D0.

21. A method for detecting refractive index of a lens, characterized in that the method is applied to a lens refractive index detecting device according to any one of claims 6 to 8, the method comprising the steps of:

(1) Before the measured lens (13) and the first focusing component (4) move in, the first light source component (1) is turned on, the light spot array projected by the Hartmann plate (30) is detected by the second photoelectric detection component (9), and the position of the light spot array is used as a reference position for the position adjustment and focal power calculation of the subsequent measured lens (13);

(2) Moving into the first focusing assembly (4), detecting interference phenomenon by the first photoelectric detection assembly (8), and recording the position d1 of the second reflecting mirror (12) when the interference phenomenon occurs;

(3) Removing the first focusing assembly (4), moving into the measured lens (13), monitoring the projected actual light spot array by the second photoelectric detection assembly (9), calculating the center position of the lens at the moment according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1), and guiding a user to adjust the position of the measured lens (13) so that the center of the measured lens (13) coincides with the center of the light path, thus finishing the position adjustment of the measured lens (13); meanwhile, calculating the focal power of the lens (13) to be measured according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1);

(4) Then moving into the first focusing assembly (4), readjusting the position of the second reflecting mirror (12) and recording the position D2 of the second reflecting mirror (12) when the interference phenomenon occurs again in the first photoelectric detection assembly (8), and simultaneously, respectively imaging scattered light on the upper surface and the lower surface of the measured lens (13) by the first imaging assembly (6) and the second imaging assembly (7) to realize the measurement of the space heights of scattered light spots on the upper surface and the lower surface of the measured lens (13), wherein the space height difference of the scattered light spots on the upper surface and the lower surface of the measured lens (13) is the physical thickness D0 of the center of the lens;

(5) According to the physical thickness D0 of the lens center and the related parameters D1 and D2 of the optical thickness of the lens center, the refractive index of the measured lens (13) is calculated, and the calculation formula is as follows: n=1+ (D2-D1)/D0.

22. A method for detecting refractive index of a lens, characterized in that the method is applied to a lens refractive index detecting device according to any one of claims 9 to 13, the method comprising the steps of:

(1) Before the measured lens (13) moves in, the first light source component (1) is closed, the second light source component (2) is opened, the light spot array projected by the Hartmann plate (30) is detected by the second photoelectric detection component (9), and the position of the light spot array is used as a reference position for the position adjustment and focal power calculation of the subsequent measured lens (13);

(2) Closing the second light source assembly (2), opening the first light source assembly (1), detecting an interference phenomenon in the first photoelectric detection assembly (8), and recording the position d1 of the second reflecting mirror (12) when the interference phenomenon occurs;

(3) Closing the first light source assembly (1), opening the second light source assembly (2), moving into the measured lens (13), monitoring the projected actual light spot array by the second photoelectric detection assembly (9), calculating the center position of the lens at the moment according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1), and guiding a user to adjust the position of the measured lens (13) so that the center of the measured lens (13) coincides with the center of the light path, thus finishing the position adjustment of the measured lens (13); meanwhile, calculating the focal power of the lens (13) to be measured according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1);

(4) The second light source component (2) is closed, the first light source component (1) is opened, the position of the second reflecting mirror (12) is readjusted, the position D2 of the second reflecting mirror (12) is recorded when the interference phenomenon occurs again in the first photoelectric detection component (8), the difference value between D2 and D1 is related to the optical thickness of the center of the lens, meanwhile, the light beam output by the first light source component (1) is focused at the position of the lens (13) to be detected by the first focusing component (4), light scattering is generated on the upper surface and the lower surface of the lens (13) to be detected, the scattered light on the upper surface and the lower surface of the lens (13) to be detected is imaged by the first imaging component (6) and the second imaging component (7) respectively, and the scattered light spot space height difference between the upper surface and the lower surface of the lens (13) to be detected is the physical thickness D0 of the center of the lens;

23. A method for detecting refractive index of a lens, wherein the method is applied to a lens refractive index detecting device according to any one of claims 14 to 19, the method comprising the steps of:

before the measured lens (13) moves in, the first light source component (1) and the second light source component (2) are closed, the third light source component (3) is opened, the second photoelectric detection component (9) detects the light spot array transmitted by the Hartmann plate (30), and the position of the light spot array is used as a reference position for position adjustment and focal power calculation of the subsequent measured lens (13);

(2) Turning off the third light source assembly (3), turning on the second light source assembly (2), detecting an interference phenomenon by the first photoelectric detection assembly (8), and recording the position d1 of the second reflecting mirror (12) when the interference phenomenon occurs;

(3) Closing the second light source assembly (2), opening the third light source assembly (3), moving into the measured lens (13), monitoring the projected actual light spot array by the second photoelectric detection assembly (9), calculating the center position of the lens at the moment according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1), and guiding a user to adjust the position of the measured lens (13) so that the center of the measured lens (13) coincides with the center of the light path, thus finishing the position adjustment of the measured lens (13); meanwhile, calculating the focal power of the lens (13) to be measured according to the deviation between the position of the actual light spot array and the reference position obtained in the step (1);

(4) The third light source component (3) is closed, the first light source component (1) is opened, the light beam output by the first light source component (1) is focused at the position of the measured lens (13) by the first focusing component (4), light scattering is generated on the upper surface and the lower surface of the measured lens (13), the scattered light on the upper surface and the lower surface of the measured lens (13) is imaged by the first imaging component (6) and the second imaging component (7) respectively, the space height of scattered light spots on the upper surface and the lower surface of the measured lens (13) is measured, and the space height difference of scattered light spots on the upper surface and the lower surface of the measured lens (13) is the center physical thickness D0 of the lens;

(5) Turning off the first light source assembly (1), turning on the second light source assembly (2), readjusting the position of the second reflecting mirror (12) and recording the position d2 of the second reflecting mirror (12) when the interference phenomenon occurs again in the first photoelectric detection assembly (8), wherein the difference value between d2 and d1 is related to the optical thickness of the center of the lens;