Lens detection device capable of automatically calculating lens microsphere power and micro-column power

Abstract

The utility model relates to a lens detection device, in particular to a lens detection device capable of automatically calculating lens microsphere power and micro-column power. The utility model aims to solve the problems that the error is large when a lens is observed and detected by human eyes, the requirement on professional skills of operators is high when a focal length instrument is used for detecting the lens, and the focal length instrument is high in price and difficult to popularize and apply. In the utility model, a light source, a collimating lens group, a collecting lens, a beam splitter prism and a sensor are sequentially arranged in a straight line from left to right, a sample to be tested is arranged between the collimating lens group and the collecting lens, the signal output end of the sensor is connected with the signal input end of a computer, and a closed-loop light source receiver is arranged below the beam splitter prism. A focusing light spot of the beam splitter prism irradiates on the closed-loop light source receiver, and the closed-loop light source receiver is connected with the light source through the analog signal light source synchronous control panel. The utility model belongs to the technical field of lens detection.

Description

Technical Field

[0001] The utility model relates to a lens detection device, belonging to the technical field of lens detection. Background Art

[0002] Protective masks, helmet eyepieces, medical goggles, sunglasses, etc. generally use transparent materials as lenses. These lenses will produce slight deformations during the production process, so they need to be tested before leaving the factory to screen out unqualified products. The traditional detection method is to use subjective observation and judgment by the human eye, or to use expensive focal meters for testing. Both methods have disadvantages: human eye observation can only make qualitative judgments but not quantitative judgments, and there are individual differences in human eyes, so the results are prone to controversy; as a high-end general optical equipment, the focal meter has comprehensive functions, but the operation is relatively complex, and it has high professional skills requirements for operators. In addition, the focal meter is expensive and difficult to popularize.

[0003] The traditional solution can measure the image changes after the light passes through the sample object and make comparative calculations to obtain the actual morphological deformation of the sample object. However, in the image acquisition process, due to the different transmittances of different sample objects, the actual acquired image will be affected by the brightness information, which in turn affects the image size information. The interference in the measurement of subtle changes is particularly obvious. If the brightness passing through the sample object can be physically normalized, the two physical quantities of light deflection and brightness can be separated more efficiently, thereby obtaining accurate information on the sample object morphology or the imaging of the light spot passing through the sample object. Utility Model Content

[0004] The utility model aims to solve the problems that the error of detecting lenses by human eyes is large, the professional skills of operators are high when using a focal meter to detect lenses, and the focal meter is expensive and difficult to popularize and apply. Therefore, a lens detection device which automatically calculates the micro-spherical power and micro-cylindrical power of the lens is proposed.

[0005] The technical solution adopted by the utility model to solve the above problems is: the utility model includes a light source, a collimating lens group, a condenser, a dichroic prism, a sensor, an analog signal light source synchronization control board, a closed-loop light source receiver and a computer; the light source, the collimating lens group, the condenser, the dichroic prism and the sensor are arranged in a straight line from left to right, the sample to be tested is arranged between the collimating lens group and the condenser, the signal output end of the sensor is connected to the signal input end of the computer, the closed-loop light source receiver is arranged below the dichroic prism, and the focused light spot of the dichroic prism is irradiated on the closed-loop light source receiver, and the closed-loop light source receiver is connected to the light source through the analog signal light source synchronization control board.

[0006] Furthermore, the light source is a standard circular point light source in the visible light band.

[0007] Furthermore, the collimating lens group is an achromatic collimating lens group.

[0008] Furthermore, the condenser is an achromatic condenser.

[0009] Furthermore, the sensor is a CCD sensor.

[0010] Furthermore, a Vλ filter is provided on the closed-loop light source receiver.

[0011] Furthermore, the closed-loop light source receiver is a silicon photocell in the visible light band.

[0012] The beneficial effects of the utility model are:

[0013] 1. The utility model can greatly improve the accuracy and speed of detection. By separating the image after brightness interference, the program can perform high-speed recognition and calculation on the image; it not only improves the test efficiency but also improves the test accuracy; at the same time, it reduces the complicated operation steps of the operator; and can realize online high-speed production detection;

[0014] 2. The scheme shown in the utility model can be flexibly applied, and it plays a good application reference role in the high-speed identification and screening of samples in automated industrial production;

[0015] 3. The visible band standard dot light source of the utility model adopts analog circuit closed-loop light source control; it realizes millisecond-level light source irradiance adaptation to maintain the continuous stability of the light source during the measurement process; any ambient light interference can also be automatically compensated; at the same time, it adapts to the sample transmittance of 1 to 99% for adaptive calibration;

[0016] 4. The closed-loop light source receiver of the utility model is provided with a Vλ filter, which can realize the collection of the spectrum visible to the human eye;

[0017] 5. The light spot received by the CCD sensor of the utility model is not affected by the material transmittance and always maintains a constant size. The light spot of the CCD sensor will change only when the sample has a slight refractive power or a slight deformation;

[0018] 6. The utility model cleverly separates the image size from the image brightness, so that the imaging spot always maintains a constant brightness, avoiding the influence of the spot brightness on the image size, and thus obtaining an accurate contrast image on the CCD;

[0019] 7. The utility model realizes the real-time separation of the spot image size and the image irradiance (brightness) through the application of a closed-loop light source, so that the image size is not affected by the image brightness, and the image size only changes due to the image deformation caused by the unevenness of the sample;

[0020] 8. This utility model is an independent system that supports the simultaneous operation of multiple structures and can be used to test multiple samples at the same time;

[0021] 9. The utility model realizes accurate calculation of pixel-level images by converting the size of graphics. The spherical degree and cylindrical degree of the sample can be calculated by the changes in the X-axis and the Y-axis. The prismatic degree of the sample can be measured by the offset of the center point of the XY axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the optical path principle of the utility model;

[0023] Figure 2 This is a schematic diagram comparing the normal light spot and the distorted light spot. DETAILED DESCRIPTION

[0024] Specific implementation method 1: Combination Figure 1 The present embodiment is described. The lens detection device for automatically calculating the micro-spherical power and micro-cylindrical power of the lens described in the present embodiment comprises a light source 1, a collimating lens group 2, a condenser 3, a dichroic prism 4, a sensor 5, an analog signal light source synchronization control board 6, a closed-loop light source receiver 7 and a computer 8; the light source 1, the collimating lens group 2, the condenser 3, the dichroic prism 4 and the sensor 5 are arranged in a straight line from left to right, the sample to be tested 9 is arranged between the collimating lens group 2 and the condenser 3, the signal output end of the sensor 5 is connected to the signal input end of the computer 8, the closed-loop light source receiver 7 is arranged below the dichroic prism 4, and the focused light spot of the dichroic prism 4 is irradiated on the closed-loop light source receiver 7, and the closed-loop light source receiver 7 is connected to the light source 1 through the analog signal light source synchronization control board 6.

[0025] Specific implementation method 2: Combination Figure 1 To explain this embodiment, the light source 1 of the lens detection device for automatically calculating the microspherical power and microcylindrical power of a lens described in this embodiment is a standard circular point light source in the visible light band. Other components and connection relationships are the same as those in the first embodiment.

[0026] Specific implementation method three: Combination Figure 1 To explain this embodiment, the collimating lens group 2 of the lens detection device for automatically calculating the micro-spherical power and micro-cylindrical power of a lens described in this embodiment is an achromatic collimating lens group. Other components and connection relationships are the same as those of the first embodiment.

[0027] Specific implementation method four: Combination Figure 1 To explain this embodiment, the condenser 3 of the lens detection device for automatically calculating the microspherical power and microcylindrical power of a lens described in this embodiment is an achromatic condenser. Other components and connection relationships are the same as those of the first embodiment.

[0028] Specific implementation method five: Combination Figure 1 To explain this embodiment, the sensor 5 of the lens detection device for automatically calculating the micro-spherical power and micro-cylindrical power of a lens described in this embodiment is a CCD sensor. Other components and connection relationships are the same as those of the first embodiment.

[0029] Specific implementation method six: Combination Figure 1 This embodiment is described as follows: a closed-loop light source receiver 7 of a lens detection device for automatically calculating the micro-spherical power and micro-cylindrical power of a lens is provided with a Vλ filter. Other components and connection relationships are the same as those of the first embodiment.

[0030] Specific implementation method seven: Combination Figure 1 To explain this embodiment, the closed-loop light source receiver 7 of the lens detection device for automatically calculating the micro-spherical power and micro-cylindrical power of the lens described in this embodiment is a visible light band silicon photocell. Other components and connection relationships are the same as those of the specific embodiment 6.

[0031] How it works

[0032] like Figure 2 As shown, in the state without sample, the influence of air on light propagation can be ignored; a normal circular light spot is displayed. After placing the sample, due to the real-time monitoring of the brightness after placing the sample by the closed-loop light source receiver 7 and the real-time conversion of the brightness of the compensation light source 1 by the analog signal light source synchronization control board 6, no matter what sample is placed, the transmittance is 100% like air, so the image reaching the CCD sensor 5 is only the image distortion affected by the material itself.

[0033] The imaging in the camera is mainly affected by the brightness of the light reflected by the object (including the light penetrating the object) and the change in the shape and size of the object itself (including the deflection of the light due to the shape of the object itself after the light passes through the object). In other words, the final imaging is affected by both brightness and shape. Under the fixed exposure conditions of the camera, the same luminous object emits light of different intensities. Due to the interference and diffraction of light, the size of the image in the camera is different. Even if the camera can be set to automatic exposure, it cannot always accurately obtain the size information of the object (light spot).

[0034] The utility model normalizes the brightness information of different samples by adding a visible light band silicon photocell at the end of the CCD sensor 5 and performing real-time compensation on the light source of the sample 9 to be measured. The normalized brightness information can separate the deflection image actually occurring after the light passes through the object from the brightness interference, thereby obtaining accurate deflection information. Only through accurate light deflection information can tiny morphological changes be calculated and then compared and calculated.

[0035] The utility model adopts a special closed-loop constant brightness collimated light source, in conjunction with a CCD sensor 5, to perform sub-pixel-level intelligent recognition and analysis of the imaging light spot passing through the sample 9 to be tested, and to perform comparative calculations on the slight changes in the light spot, so as to obtain the slight spherical power (spherical diopter), cylindrical power (cylindrical diopter), prismatic power, and prism mutual error of the plane sample.

[0036] Through the combined use of the innovative optical path and closed-loop circuit of the utility model, the millisecond-level automatic adjustment of the brightness of the collimated light source of samples with different transparencies is achieved, and the recognition and calculation of the proportional images collected by the camera with or without samples in the optical path are truly realized to obtain high-precision test values.

[0037] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, without departing from the content of the technical solution of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A lens detection device for automatically calculating the micro-spherical power and micro-cylindrical power of a lens, characterized in that: The lens detection device for automatically calculating the microspherical power and microcylindrical power of a lens comprises a light source (1), a collimating lens group (2), a condenser (3), a beam splitter (4), a sensor (5), an analog signal light source synchronization control board (6), a closed-loop light source receiver (7) and a computer (8); the light source (1), the collimating lens group (2), the condenser (3), the beam splitter (4) and the sensor (5) are arranged in sequence in a straight line from left to right, the sample to be tested (9) is arranged between the collimating lens group (2) and the condenser (3), the signal output end of the sensor (5) is connected to the signal input end of the computer (8), the closed-loop light source receiver (7) is arranged below the beam splitter (4), and the focused light spot of the beam splitter (4) is irradiated on the closed-loop light source receiver (7), and the closed-loop light source receiver (7) is connected to the light source (1) via the analog signal light source synchronization control board (6).

2. A lens detection device for automatically calculating the micro-spherical power and micro-cylindrical power of a lens according to claim 1, characterized in that: The light source (1) is a standard circular point light source in the visible light band.

3. The lens detection device for automatically calculating the micro-spherical power and micro-cylindrical power of a lens according to claim 1, characterized in that: The collimating lens group (2) is an achromatic collimating lens group.

4. The lens detection device for automatically calculating the micro-spherical power and micro-cylindrical power of a lens according to claim 1, characterized in that: The condenser (3) is an achromatic condenser.

5. The lens detection device for automatically calculating the micro-spherical power and micro-cylindrical power of a lens according to claim 1, characterized in that: The sensor (5) is a CCD sensor.

6. The lens detection device for automatically calculating the micro-spherical power and micro-cylindrical power of a lens according to claim 1, characterized in that: A Vλ filter is provided on the closed-loop light source receiver (7).

7. A lens testing device for automatically calculating the micro-spherical power and micro-cylindrical power of a lens according to claim 6, characterized in that: The closed-loop light source receiver (7) is a silicon photocell in the visible light band.

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