CN113155287A - Spectacle lens color measuring device - Google Patents
Spectacle lens color measuring device Download PDFInfo
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- CN113155287A CN113155287A CN202110461535.9A CN202110461535A CN113155287A CN 113155287 A CN113155287 A CN 113155287A CN 202110461535 A CN202110461535 A CN 202110461535A CN 113155287 A CN113155287 A CN 113155287A
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- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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- G01M11/0207—Details of measuring devices
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Abstract
The invention discloses a device for detecting the quality of an eyeglass, belonging to the technical field of eyeglass detection; the device of the invention adopts the principle of grating light splitting detection, and can accurately measure the color of the spectacle lens with the diopter range of +25D to-25D. The real-time online detection of the colors of the spectacle lenses on the flow production line can be realized, and the unqualified products can be warned in real time. Besides color measurement, the method can monitor key parameters of the spectacle lens such as blue light transmittance and light transmittance in real time, and realize quality control of the spectacle lens.
Description
Technical Field
The invention relates to the field of spectacle lens detection, in particular to a spectacle lens color measuring device.
Background
Color measurement has been widely used in research, production, and life. With the progress of science and technology and the development of economy, people have higher and higher index requirements on product color, and the color difference can directly influence the quality grade of products. In recent years, in the related industries of color at home and abroad, such as textile printing and dyeing, ink printing, dye manufacturing and the like, the correctness of the color of a product is a crucial quality index. These departments need to detect and monitor color quality, and use color parameters as the basis for product classification and grading. In batch production, it is important to ensure that the color indexes of the same batch of products and different batches of products are consistent. The deviation between the color of the product and the color of the standard sample exceeds the standard, defective products or waste products can be caused, and serious economic loss is brought to enterprises. The color measuring instrument is used for replacing human eyes to distinguish colors, so that the product quality can be effectively improved, and preconditions are provided for computer color matching.
Color is a psychophysical quantity. The perception of color is known by the human eye by receiving a light signal reflected or transmitted by an object. Color persistence is a three-variable function that can be described by three elements of color, lightness, hue, and saturation. The light source color is determined by the spectral distribution of the light source. The object color is determined by the spectral characteristics of the object surface. However, the human eye does not always have the same color perception for objects with the same spectral characteristics of the surface of the object, and another key factor affecting the color perception of the human eye is the geometrical characteristics of the surface light spatial distribution of the object. The description of the geometrical characteristics is complex, different industries pay different attention, and different description and measurement methods are adopted, such as the surface gloss of an object, the orange peel and the like.
Over the years of experimental accumulation by scientists, the commission internationale de l' eclairage (CIE) organization proposed a series of standardized colorimetry systems. The method not only comprises a corresponding color expression method, but also comprises a series of standard precise optical detection models, calculation methods and various standard color measurement methods. Based on the principle of colorimetry, various color measuring instruments measure objects or light sources by taking the CIE standard as reference so as to obtain objective evaluation. The method has the significance of quantifying the color of the object surface or the light source, providing convenient and effective standards and ways for product design and production control, and being more beneficial to the establishment of industrial standards.
There are three main methods for color measurement: visual methods, spectrophotometry and photoelectric integration methods. Visual methods are one of the most basic and traditional methods of color measurement. The measured object was visually observed under standard illumination conditions by a standard chromaticity observer specified by CIE (International Commission on Standard illumination), and the chromaticity parameters were obtained by comparison with a standard chromaticity diagram. This method has been rarely used because the human eye cannot accurately recognize subtle differences and the subjectivity of the observation. Spectrophotometry is an accurate method of color measurement. The tristimulus values of the object under various standard light sources and standard illuminants are calculated by measuring the spectral power distribution of the light source or the spectral power of the reflected light of the object and utilizing the measured data. This method determines the color parameters of an object by detecting its spectral components, and therefore the accuracy of the measurement is very high. However, the system realized by the method has complex structure, complex operation and higher cost, and is suitable for occasions with higher requirements on color measurement and color matching. The photoelectric integration method is a color measurement method for simulating the tristimulus values characteristic of human eyes. The measured spectral power is measured by integrating the spectral response of the detector into the CIE standard chromaticity observer spectral tristimulus curve, or a specific spectral response curve. Although the instrument manufactured by the photoelectric integration method cannot accurately measure the tristimulus values and chromaticity coordinates of the objects, the instrument can accurately measure the color difference between the two objects, and is also called as a colorimeter.
However, at present, the color measuring instrument is mainly applied to the color management field of the industries such as chemical industry, food, plastics, architecture, printing, coating, paint, ink, textile and clothing, and mainly measures the diffuse reflection of the surface of an opaque object such as colored paper and the scattered light information to measure the color. In the field of glasses, due to the high light transmittance and specular reflection characteristics of the glasses, such instruments cannot accurately perform color measurement.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an eyeglass color measuring device. The device adopts the principle of grating light splitting detection, and can accurately measure the color of the spectacle lens with the diopter range from +25D to-25D. The real-time online detection of the colors of the spectacle lenses on the flow production line can be realized, and the unqualified products can be warned in real time. Besides color measurement, the method can monitor key parameters of the spectacle lens such as blue light transmittance and light transmittance in real time, and realize quality control of the spectacle lens.
The technical solution of the invention is as follows:
the device of the invention comprises a measuring system T and a positioning system D. The measuring system T comprises a first light filter, a second light filter, a third lens, a fourth lens, a third light filter, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a fifth lens, a sixth lens, a fifth lens, a fifth lens. The second slit can precisely move along the direction vertical to the light path to perform spatial filtering under the control of the stepping motor, so that light with different wavelengths can be incident to the detector after passing through the second slit in sequence. The other path of reflected light passing through the spectroscope is incident to the photodiode array.
The positioning system D comprises a signal generator and a signal detector which are positioned at the upper side and the lower side of the assembly line; the vertical distance between the center of the signal detector and the center of the second lens is the radius length of the spectacle lens to be measured.
A slit is arranged in the middle of the spectacle lens production line, so that the light emitted from the shutter can reach the spectacle lens to be detected, and the signal emitted by the signal generator can reach the signal detector.
The shutter, the zoom lens, the compensating lens, the detector, the stepping motor, the photodiode array, the signal generator, the signal detector and the production line are respectively connected with a computer.
The light source adopts a CIE standard illuminant D65 light source.
The coating material in the integrating sphere is barium sulfate, the diameter range is 0.5m to 2m, and the incident window and the exit window are made of quartz glass materials.
The transmission wavelength range of the first optical filter and the second optical filter is 360nm to 830nm, and the average transmittance is more than 95%.
The first lens, the second lens, the zoom lens group, the compensation lens group, the third lens and the fourth lens are all made of quartz glass materials.
The light-passing aperture of the small-hole diaphragm is adjustable, and the adjustable range is 1 cm-7 cm.
The distance range of the second lens to the spectacle lens to be measured is 2-10 cm.
The spectral waveband of the spectroscope ranges from 360nm to 830nm, the transmittance is 10%, and the reflectivity is 90%.
The distance between the spectroscope and the first slit is consistent with the distance between the spectroscope and the photodiode array.
The slit width of the first slit and the slit width of the second slit are adjustable and are consistent.
The focal lengths of the third lens and the fourth lens are equal.
The grating is a blazed grating, and the light splitting wave band is 360nm to 830 nm.
The photodiode array is composed of N-N photodiode arrays sensitive to wave bands from 360nm to 830 nm.
The distance between the signal detector and the second lens along the center perpendicular to the measuring light path is equal to the radius of the spectacle lens to be measured.
The principle and process for measuring the color of the spectacle lens by using the spectacle lens color measuring device comprise the following steps:
step 1, in the production process of the spectacle lenses, the spectacle lenses to be measured advance on an assembly line, when the front edges of the spectacle lenses to be measured move between a signal generator and a signal detector, the signal detector cannot detect signals sent by the signal generator due to shielding of the spectacle lenses to be measured, at the moment, the signal detector outputs low-level signals, the fact that the spectacle lenses to be measured move to proper positions is indicated, and the device is triggered to carry out color measurement.
And 2, controlling the assembly line to stop moving and start color measurement after the computer receives a low level signal sent by the signal detector. And opening the shutter, so that the light emitted by the light source passes through the spectacle lens to be detected after being subjected to uniform light collimation, and the transmitted light passes through the second lens, the zoom lens group, the compensating lens group, the second optical filter and the spectroscope and enters the photodiode array. The computer controls the zoom lens group and the compensation lens group to move, so that the size of a convergent light spot incident to the photodiode array is changed, when the number of photodiodes capable of detecting optical signals in N × N photodiodes in the photodiode array is the minimum, the convergent effect is the best, and the zoom lens group and the compensation lens group keep the position unchanged in the color measurement process.
And 3, after the positions of the zoom lens group and the compensating lens group are optimized in the step 2, light emitted by the light source passes through the spectacle lens to be detected after uniform light collimation, transmitted light passes through the second lens, the zoom lens group, the compensating lens group, the second light filter and the spectroscope for times and then is converged to the first slit for spatial light filtering, then the light is collimated by the third lens and then enters the surface of the grating, and light with different wavelengths respectively passes through the fourth lens, is converged by the second slit and then enters the detector. The stepping motor controls the second slits to move in sequence, so that light with different wavelengths is incident to the detector in sequence, and the light power value corresponding to each wavelength is recorded to obtain the transmission spectrum power distribution function f of the spectacle lens to be measured1(lambda). To be f1And (lambda) after the measurement is finished, the computer controls the shutter to close and simultaneously controls the production line to start moving.
And 4, the spectacle lens to be measured continues to advance on the production line, when the rear edge of the spectacle lens to be measured moves out of the position between the signal generator and the signal detector, the signal detector can detect a signal sent by the signal generator due to the fact that the spectacle lens to be measured is not shielded, the signal detector outputs a high-level signal at the moment, the fact that the spectacle lens to be measured moves out of the measuring position is explained, and the device is triggered to carry out background measurement.
And 5, after the computer receives the high-level signal sent by the signal detector, controlling the assembly line to stop moving and starting to carry out background measurement. And opening the shutter, so that the light emitted by the light source passes through the slit of the production line after being homogenized and collimated, and the transmitted light passes through the second lens, the zoom lens group, the compensating lens group, the second light filter and the spectroscope and enters the photodiode array. The computer controls the zoom lens group and the compensation lens group to move, so that the size of a convergent light spot incident to the photodiode array is changed, when the number of photodiodes capable of detecting optical signals in N x N photodiodes in the photodiode array is the minimum, the convergent effect is the best, and the zoom lens group and the compensation lens group keep the positions unchanged in the background measurement process.
And 6, after the positions of the zoom lens group and the compensating lens group are optimized in the step 5, light emitted by the light source passes through the spectacle lens to be tested after being subjected to uniform light collimation, the transmitted light passes through the second lens, the zoom lens group, the compensating lens group, the second light filter and the spectroscope for times and then is converged to the first slit for spatial light filtering, then the light is collimated by the third lens and then enters the surface of the grating, and light with different wavelengths respectively passes through the fourth lens and then is converged by the second slit and then enters the detector. The stepping motor controls the second slits to move in sequence, so that light with different wavelengths is incident to the detector in sequence, and the light power value corresponding to each wavelength is recorded to obtain a background transmission spectrum power distribution function f2(λ)。f2And (lambda) after the measurement is finished, the computer controls the shutter to close and simultaneously controls the production line to start moving.
And 7, processing data by a computer: the tristimulus value of the spectacle lens to be measured is calculated by adopting formulas (1), (2) and (3):
in the formula: lambda is wavelength, the measuring range of the device is 360nm to 830nm, f0(lambda) is the spectral power distribution of the light source 1, f1(lambda) is the transmission spectral power distribution of the ophthalmic lens to be measured, f2(λ) is the background transmitted spectral power distribution, x (λ), y (λ), z (λ) are functions of the spectral tristimulus values of CIE1964 standard chromaticity observers, Δ λ is the wavelength interval, a is a constant whose value is determined by the following equation:
chromaticity coordinates are:
X10＝X/(X+Y+Z) (5)
Y10＝Y/(X+Y+Z) (6)
Z10＝1-X-Y (7)
transmittance of blue light τsbThe calculation is performed using equation 8:
in the formula: es (lambda) is the solar spectral power distribution at sea level when the air quality is 2, and B (lambda) is the blue light danger coefficient.
Light transmittance tauVThe calculation is performed using equation 9:
in the formula: v (lambda) is the spectral luminous efficiency function of average human eyes under sunlight.
Optionally, the color range of the batch of spectacle lenses can be preset in a computer, the computer compares the result with the preset color range, and if the result exceeds the color range, a warning word is output on a display.
Step 9, the computer transmits tau according to the blue lightsbAnd light transmittance tauVComparing the calculation result with a threshold value, if the calculation result is lower than the threshold value, the transmittance of the spectacle lens is unqualified, and outputting a warning word on a display.
The steps 1-9 are controlled by a computer to realize complete automatic processing, so that the color measurement and quality detection can be rapidly and effectively carried out on the glasses.
The invention has the beneficial effects that:
1. the invention adopts a grating spectrophotometry detection method, and can accurately measure the color of the spectacle lens with diopter ranging from +25D to-25D.
2. The invention can realize real-time online detection of the color of the spectacle lens on the flow production line and real-time warning of unqualified products.
3. The invention can monitor the film coating process by measuring the color of the glasses lens, so as to increase the stability of the film coating process.
4. The invention can realize color measurement, and can monitor key parameters of the spectacle lens, such as blue light transmittance and light transmittance, in real time, thereby realizing quality control of the spectacle lens.
Drawings
Fig. 1 is a schematic structural view of a spectacle lens colorimeter.
Detailed Description
The invention will be further explained with reference to the drawings.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a spectacle lens colorimeter according to the invention. The device comprises a measuring system T and a positioning system D. The measuring system T comprises a light source 1, a first light filter 4, a first lens 5, a second lens, a small hole diaphragm 6, a shutter 7, a lens 8 to be measured, a second lens 9, a variable power lens group 10, a compensating lens group 11, a second light filter 12 and a spectroscope 13, wherein the light emitted by the light source 1 passes through an integrating sphere 3 and is fully homogenized (the baffle 2 prevents the light of the light source 1 from being directly reflected to an exit window), the light is spatially filtered through the exit window, the light is collimated by the first lens 5 and then is converged to a first slit 14 for spatial filtering, the transmitted light of the lens 8 to be measured passes through the second lens 9, the variable power lens group 10, the compensating lens group 11, the second light filter 12 and the spectroscope 13 in sequence and then is converged to a first slit 14 for spatial filtering, the light is collimated by a third lens 15 and then is converged to the surface of a grating 16, and the light with different wavelengths is converged to a second slit 18 and then is transmitted to a detector 19 through a fourth lens 17. The second slit 18 can precisely move along the direction perpendicular to the light path by the control of the stepping motor 20 to perform spatial filtering, so as to ensure that light with different wavelengths can enter the detector 19 after passing through the second slit 18 in sequence. The reflected light passing through the beam splitter 13 is incident on the photodiode array 21.
The positioning system D comprises a signal generator 22 and a signal detector 23.
A slit is arranged in the middle of the spectacle lens production line 24 to ensure that the light emitted from the shutter 7 can reach the spectacle lens 8 to be measured, and the signal emitted by the signal generator 22 can reach the signal detector 23.
The shutter 7, the zoom lens 10, the compensating lens 11, the detector 19, the stepping motor 20, the photodiode array 21, the signal generator 22, the signal detector 23 and the pipeline 24 are respectively connected with a computer 25.
The light source 1 adopts a CIE standard illuminant D65 light source.
The coating material in the integrating sphere 3 is barium sulfate, the diameter range is 0.5m to 2m, and the incident window and the exit window are made of quartz glass materials.
The transmission wavelength ranges of the first optical filter 4 and the second optical filter 12 are 360nm to 830nm, and the average transmittance is greater than 95%.
The first lens 5, the second lens 9, the zoom lens group 10, the compensation lens group 11, the third lens 15 and the fourth lens 17 are all made of quartz glass materials.
The aperture of the aperture diaphragm 6 is adjustable, and the adjustable range is 1 cm-7 cm.
The distance range between the second lens 9 and the spectacle lens 8 to be measured is 2-10 cm.
The spectroscope 13 has a spectroscopic wave band of 360nm to 830nm, a transmittance of 10% and a reflectance of 90%.
The distance between the beam splitter 13 and the first slit 14 is consistent with the distance between the beam splitter 13 and the photodiode array 21.
The slit widths of the first slit 14 and the second slit 18 are adjustable and are consistent.
The third lens 15 and the fourth lens 17 have the same focal length.
The grating 16 adopts a blazed grating, and the light splitting wave band is 360nm to 830 nm.
The photodiode array 21 is composed of N × N photodiode arrays sensitive to a wavelength band of 360nm to 830 nm.
The distance between the signal detector 23 and the center of the second lens 9 along the direction perpendicular to the measuring light path is equal to the radius of the spectacle lens 8 to be measured.
The process of measuring the color of the spectacle lens by using the spectacle lens color measuring device comprises the following steps:
step 1, in the production process of the spectacle lens, the spectacle lens 8 to be measured advances on an assembly line 24, when the front edge of the spectacle lens 8 to be measured moves between a signal generator 22 and a signal detector 23, the signal detector 23 cannot detect a signal sent by the signal generator 22 due to the shielding of the spectacle lens 8 to be measured, and at the moment, the signal detector 23 outputs a low-level signal, which indicates that the spectacle lens 8 to be measured has moved to a proper position, and triggers the device to perform color measurement.
And 2, after receiving the low level signal sent by the signal detector 23, the computer 25 controls the assembly line 24 to stop moving and start color measurement. The shutter 7 is opened, so that light emitted by the light source 1 passes through the spectacle lens 8 to be detected after being subjected to uniform light collimation, and transmitted light passes through the second lens 9, the zoom lens group 10, the compensating lens group 11, the second optical filter 12 and the spectroscope 13 and enters the photodiode array 21. The computer 25 controls the zoom lens group 10 and the compensation lens group 11 to move, so that the size of the convergent light spot incident to the photodiode array 21 is changed, when the number of photodiodes capable of detecting light signals in the N × N photodiodes in the photodiode array 21 is the minimum, the convergent effect is the best, and the zoom lens group 10 and the compensation lens group 11 keep the positions in the color measurement process.
And 3, after the positions of the zoom lens group 10 and the compensating lens group 11 are optimized in the step 2, light emitted by the light source 1 passes through the spectacle lens 8 to be tested after being subjected to uniform light collimation, the transmitted light passes through the second lens 9, the zoom lens group 10, the compensating lens group 11, the second optical filter 12 and the spectroscope 13 for transmission and then is converged to the first slit 14 for spatial filtering, then is collimated by the third lens 15 and then enters the surface of the grating 16, and light with different wavelengths respectively passes through the fourth lens 17 and then is converged by the second slit 18 and then enters the detector 19 through the light splitting action of the grating 16. The stepping motor 20 controls the second slit 18 to move in sequence, so that the light with different wavelengths enters the detector 19 in sequence, and the light power value corresponding to each wavelength is recorded to obtain the transmission spectrum power distribution function f of the spectacle lens 8 to be measured1(lambda). To be f1After the (lambda) measurement is finished, the computer 25 controls the shutter 7 to close and controls the pipeline 24 to start moving.
And 4, continuing to advance the spectacle lens 8 to be measured on the production line 24, and when the rear edge of the spectacle lens 8 to be measured moves out of the position between the signal generator 22 and the signal detector 23, the signal detector 23 can detect a signal sent by the signal generator 22 due to the fact that the spectacle lens 8 to be measured is not shielded, and the signal detector 23 outputs a high-level signal at the moment, which indicates that the spectacle lens 8 to be measured moves out of the measuring position, and triggers the device to perform background measurement.
And 5, after receiving the high-level signal sent by the signal detector 23, the computer 25 controls the pipeline 24 to stop moving and start background measurement. The shutter 7 is opened, so that light emitted by the light source 1 passes through the slit of the production line 24 after being subjected to uniform light collimation, and the transmitted light passes through the second lens 9, the zoom lens group 10, the compensation lens group 11, the second optical filter 12 and the spectroscope 13 and enters the photodiode array 21. The computer 25 controls the zoom lens group 10 and the compensating lens group 11 to move, so that the size of the convergent light spot incident to the photodiode array 21 is changed, when the number of photodiodes capable of detecting light signals in the N × N photodiodes in the photodiode array 21 is the minimum, the convergent effect is the best, and the zoom lens group 10 and the compensating lens group 11 keep the positions in the background measurement process.
Step 6, after the position of the zoom lens group 10 and the compensating lens group 11 is optimized in the step 5, light emitted by the light source 1 passes through the spectacle lens 8 to be measured after being subjected to uniform light collimation, the transmitted light passes through the second lens 9, the zoom lens group 10, the compensating lens group 11, the second optical filter 12 and the spectroscope 13 for transmission and then is converged to the first slit 14 for spatial filtering, then is collimated by the third lens 15 and then enters the surface of the grating 16, and light with different wavelengths respectively passes through the fourth lens 17 and then is converged by the second slit 18 and then enters the detector 19 through the light splitting function of the grating 16. The stepping motor 20 controls the second slit 18 to move in sequence, so that the light with different wavelengths enters the detector 19 in sequence, and the light power value corresponding to each wavelength is recorded to obtain the background transmission spectrum power distribution function f2(λ)。f2After the (lambda) measurement is finished, the computer 25 controls the shutter 7 to close and controls the pipeline 24 to start moving.
And step 7, the computer 25 performs data processing: the tristimulus values of the spectacle lens to be measured are calculated by adopting formulas 1, 2 and 3:
in the formula: lambda is wavelength, the measuring range of the device is 360nm to 830nm, f0(lambda) is the spectral power distribution of the light source 1, f1(lambda) is the transmission spectral power distribution of the ophthalmic lens to be measured, f2(λ) is the background transmitted spectral power distribution, x (λ), y (λ), z (λ) are functions of the spectral tristimulus values of CIE1964 standard chromaticity observers, Δ λ is the wavelength interval, a is a constant whose value is determined by the following equation:
chromaticity coordinates are:
X10＝X/(X+Y+Z) (5)
Y10＝Y/(X+Y+Z) (6)
Z10＝1-X-Y (7)
transmittance of blue light τsbThe calculation is performed using equation 8:
in the formula: es (lambda) is the solar spectral power distribution at sea level when the air quality is 2, and B (lambda) is the blue light danger coefficient.
Light transmittance tauVThe calculation is performed using equation 9:
in the formula: v (lambda) is the spectral luminous efficiency function of average human eyes under sunlight.
Optionally, the color range of the batch of spectacle lenses can be preset in the computer 25, the computer 25 compares the result with the preset color range, and if the result exceeds the color range, a warning word is output on the display.
Step 9, the computer 25 transmits tau according to the blue light transmittancesbAnd light transmittance tauVComparing the calculation result with a threshold value, if the calculation result is lower than the threshold value, the transmittance of the spectacle lens is unqualified, and outputting a warning word on a display.
The steps 1-9 are controlled by the computer 25 to realize complete automatic processing, so that the glasses can be rapidly and effectively subjected to color measurement and quality detection.
The above-listed series of detailed descriptions are merely specific illustrations of possible embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent means or modifications that do not depart from the technical spirit of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An ophthalmic lens colorimetric device comprising a measurement system T and a positioning system D;
the measurement system T includes: light emitted by the light source (1) is fully homogenized through the integrating sphere (3), then is output through the exit window, then is subjected to spatial filtering through the first optical filter (4) and light collimated through the first lens (5) through the small-hole diaphragm (6), and then is incident to the spectacle lens (8) to be tested through the shutter (7); transmitted light passing through a spectacle lens (8) to be detected sequentially passes through a second lens (9), a zoom lens group (10), a compensating lens group (11), a second optical filter (12) and a spectroscope (13) and then is converged to a first slit (14) for spatial filtering, then is collimated by a third lens (15) and then is incident to the surface of a grating (16), and light with different wavelengths respectively passes through a fourth lens (17) and is converged by a second slit (18) and then is incident to a detector (19) through the light splitting action of the grating (16); the second slit (18) can precisely move along the direction vertical to the light path to perform spatial filtering under the control of the stepping motor (20), so that light with different wavelengths can enter the detector (19) after passing through the second slit (18) in sequence;
a baffle is arranged in the integrating sphere (3) to prevent light of the light source from being directly reflected to the exit window;
the other path of reflected light of the spectroscope (13) enters a photodiode array (21);
the positioning system D includes: a signal generator (22) and a signal detector (23);
the device is characterized in that the shutter (7), the zoom lens (10), the compensating lens (11), the detector (19), the stepping motor (20), the photodiode array (21), the signal generator (22), the signal detector (23) and the production line (24) are respectively connected with a computer (25), and the computer controls the operation of the whole device on one hand and performs data processing on the other hand to obtain information of the spectacle lens to be measured.
2. An ophthalmic lens colorimetric device according to claim 1, wherein a slit is provided in the middle of the ophthalmic lens production line (24) so that the light emitted from the shutter (7) can reach the ophthalmic lens (8) to be measured, and the signal from the signal generator (22) can reach the signal detector (23).
3. An ophthalmic lens colorimetric device as claimed in claim 1, wherein the light source (1) is a CIE standard illuminant D65 light source.
4. An ophthalmic lens colorimetric device according to claim 1, wherein the coating material in the integrating sphere (3) is barium sulfate, the diameter is in the range of 0.5m to 2m, and the entrance window and the exit window are made of quartz glass.
5. The device according to claim 1, wherein the first filter (4) and the second filter (12) have a transmission wavelength range of 360nm to 830nm and an average transmission rate of more than 95%.
6. The spectacle lens colorimetry device according to claim 1, wherein the first lens element (5), the second lens element (9), the zoom lens group (10), the compensation lens group (11), the third lens element (15) and the fourth lens element (17) are all made of quartz glass materials, focal lengths of the third lens element (15) and the fourth lens element (17) are equal, and a distance range from the second lens element (9) to a spectacle lens element (8) to be measured is 2-10 cm.
7. An ophthalmic lens colorimetric device according to claim 1, wherein the aperture stop (6) has an adjustable clear aperture in a range of 1cm to 7 cm.
8. The ophthalmic lens colorimetric device according to claim 1, wherein the spectroscope (13) has a spectroscopic band of 360nm to 830nm, a transmittance of 10% and a reflectance of 90%; the distance between the spectroscope (13) and the first slit (14) is consistent with the distance between the spectroscope (13) and the photodiode array (21); the grating (16) adopts a blazed grating, and the light splitting wave band is 360nm to 830 nm; the photodiode array (21) adopts N-N photodiode arrays sensitive to a wave band from 360nm to 830 nm.
9. A spectacle lens colorimeter device according to claim 1 wherein the first slit 14 and the second slit 18 have adjustable slit widths and the slit widths are consistent.
10. An ophthalmic lens colorimetric device according to claim 1 wherein the distance between the signal detector (23) and the second lens (9) along the center perpendicular to the measurement optical path is equal to the radius of the ophthalmic lens (8) to be measured.
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| CN114216655A (en) * | 2021-12-08 | 2022-03-22 | 江苏汇鼎光学眼镜有限公司 | Method for measuring imaging quality of spectacle lens |
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