CN112845163B - Device for measuring yellowing degree of spectacle lens - Google Patents

Device for measuring yellowing degree of spectacle lens Download PDF

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Publication number
CN112845163B
CN112845163B CN202011520535.3A CN202011520535A CN112845163B CN 112845163 B CN112845163 B CN 112845163B CN 202011520535 A CN202011520535 A CN 202011520535A CN 112845163 B CN112845163 B CN 112845163B
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lens
light
detector
yellowing
spectacle lens
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CN112845163A (en
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蒋俊平
佟艳群
张霏霏
周志强
焦飞宏
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Jiangsu Huiding Optical Glasses Co ltd
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Jiangsu Huiding Optical Glasses Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/3416—Sorting according to other particular properties according to radiation transmissivity, e.g. for light, x-rays, particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/36—Sorting apparatus characterised by the means used for distribution
    • B07C5/361—Processing or control devices therefor, e.g. escort memory
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/36—Sorting apparatus characterised by the means used for distribution
    • B07C5/361—Processing or control devices therefor, e.g. escort memory
    • B07C5/362—Separating or distributor mechanisms

Abstract

The invention discloses a device for measuring yellowing degree of a spectacle lens. The device can realize real-time online detection of the yellowing degree of the spectacle lens on the convection production line and carry out real-time screening work on unqualified products. The device adopts the detector to collect the broad spectrum at one time, thereby greatly shortening the detection time. The device adopts two modes of transmission and reflection to cooperate with the measurement of the yellowing degree of the spectacle lens, thereby increasing the reliability and the accuracy of the device. The light source of the device adopts the light evening device to homogenize light, and simultaneously adopts a pulse type illumination mode, thereby being beneficial to the improvement of the measurement accuracy. This device can realize that unqualified product is automatic to be screened out, has saved the manpower greatly, can in time send out the police dispatch newspaper if unqualified product is more in the production line simultaneously, warns this batch product qualification rate low, must in time check raw and other materials quality or optimize processing technology parameter.

Description

Device for measuring yellowing degree of spectacle lens
Technical Field
The invention relates to the field of detection of spectacle lenses, in particular to a device for measuring yellowing of spectacle lenses.
Background
China is known as the "kingdom of eyeglasses" throughout the world. According to the research report of the world health organization, the myopia population in China currently exceeds 6 hundred million, and accounts for nearly half of the population in China. The myopia rates of high school students and college students exceed 7, and the myopia rate of primary school students is close to 50%. China is one of the countries with the highest incidence rate of myopia in the world at present.
The quality of the lens directly affects the health of vision, so that the national quality supervision department lists metering equipment such as a lensmeter, a optometry lens, an optometry machine and the like as metering instruments for forced verification. The state also provides a series of national standard guidelines and regulations for the production and processing of eyeglasses.
Yellowness or yellowness index is an important parameter for the quality of ophthalmic lenses. The yellowness index refers to the yellowness of the lenses relative to the light source of the International Commission on illumination (CIE) standard C, using magnesium oxide as a reference. It is an important technical index for evaluating the quality and the aging degree of the plastic lens. The yellowing and transparency of the lens are related to the manufacturing process and are influenced by the use environment conditions, so that the manufacturing quality and the use performance can be inferred by testing the transparency and the yellowing of the lens. If the lens becomes yellow in color, its transparency is reduced and its handling properties are deteriorated, which can be explained by the aging mechanism of the polymer. Since the lens is inevitably exposed to air during its formation, storage and use, the aging is mainly oxidation, and heat and light accelerate the oxidation, so called thermo-oxidative aging. The photo-oxidative aging is mainly used in the outdoor atmosphere. The rate of oxidation depends on the molecular structure of the polymer, and as a result, molecular chains are broken or decomposed, changing the molecular structure of the polymer, thereby discoloring and embrittling the article, and reducing transparency, tensile strength, and the like. For example, PC lenses are easily oxidized and thermally decomposed during molding, and the aliphatic bonds are rapidly hydrolyzed, thereby reducing the molecular weight, deteriorating the mechanical properties and yellowing the color. PS lenses turn yellow under the action of sunlight, and the color depth is related to the content and the performance of impurities.
In addition, in recent years, resin lenses have been excellent in overall performance, but have also been highly yellowed due to complicated processing. The quantity of blue light prevention lenses in the current market is continuously increased, and the blue light prevention lenses are popular with consumers. However, the blue light-proof lens generally adopts a coating process to filter blue light, and the blue light with the wavelength of 465-455 nm is also over-reflected or absorbed while the blue light with the wavelength of 400-455nm is filtered, so that the display distortion of object color is caused, and the yellowing degree of the lens is increased.
The method has very important application value for measuring the yellowing factor of the spectacle lens because the factors influencing the yellowing factor of the optical resin lens are more and are an important technical index for judging the manufacturing quality and the use value of the lens.
However, the existing yellowing measurement field of spectacle lenses still has a plurality of defects:
(1) at present, most of the yellowing degree measurement is in the field of chemical materials, and only opaque materials and transparent flat materials can be measured. The spectacle lens has a certain concave-convex surface, so that a certain deflection effect is generated on the transmitted light and the reflected light. These devices are difficult to detect on clear ophthalmic lenses having a certain concave-convex surface.
(2) The traditional detection process needs steps such as light splitting and the like, the measurement time of a single sample is long, and the method cannot adapt to the production line operation mode of modern spectacle lenses.
(3) Due to the characteristics of the spectacle lens and the influence of the production environment, the influence of the stray light of the measurement background of the yellowing degree is particularly obvious, and the traditional detection cannot adapt to the real-time online detection application scene, so that the reliability and the accuracy are greatly reduced.
(4) The traditional detection method cannot screen unqualified products in real time, needs a large amount of manpower and material resources, wastes time and labor, and is not beneficial to the modern production process.
Disclosure of Invention
In view of the deficiencies of the prior art, the present invention provides an apparatus for measuring the yellowness of an ophthalmic lens. The device comprises five subsystems, namely a transmission type yellowing degree measuring system (T), a reflection type yellowing degree measuring system (F), a lens position detecting system (W), a control processing system (C) and a lens screening system (S). The device can realize real-time online detection of the yellowing degree of the spectacle lens on the convection production line and carry out real-time screening work on unqualified products. The device adopts the detector to collect the broad spectrum at one time, thereby greatly shortening the detection time. The device adopts two modes of transmission and reflection to cooperate with the measurement of the yellowing degree of the spectacle lens, thereby increasing the reliability and the accuracy of the device. The light source of the device adopts the light evening device to even light, so that the uniformity of the light source is better. Meanwhile, the pulse type illumination mode is adopted, so that the instability of signals generated by the jitter of the ambient light and the sample to be measured is effectively avoided, and the measurement accuracy is improved. This device can realize that unqualified product is automatic to be screened out, has saved the manpower greatly, can in time send out the police dispatch newspaper if unqualified product is more in the production line simultaneously, warns this batch product qualification rate low, must in time check raw and other materials quality or optimize processing technology parameter.
The technical solution of the invention is as follows:
the device comprises five subsystems, namely a transmission type yellowing degree measuring system (T), a reflection type yellowing degree measuring system (F), a lens position detecting system (W), a control processing system (C) and a lens screening system (S).
The transmission-type yellowing degree measurement system (T) comprises: light emitted by the red LED array 1 and the blue LED array 2 is homogenized by the homogenizer 3, enters the first collimating system 5 through the first lens 4, is spatially filtered by the first aperture diaphragm 6, and then is applied to a spectacle lens 13 to be measured on the production line 12 through the first shutter 7. A slit is arranged in the middle of the production line 12 to ensure that light emitted by the red LED array 1 and the blue LED array 2 can reach the spectacle lens to be measured. After light transmitted from the spectacle lens 13 to be measured sequentially passes through the zoom lens B composed of the second lens 801, the third lens 802, the fourth lens 803 and the fifth lens 804, a red light part in a spectrum enters the first detector 807 through the transmission of the first optical filter 805, and is collected, and a blue light part in the spectrum enters the second detector 809 through the reflection of the first optical filter 805 and the third optical filter 808. The zoom lens B can realize a zoom function through the zoom controller 810, and can ensure that light transmitted through the to-be-measured spectacle lens 13 with different diopters can be collected by the detector. The red LED array 1, the blue LED array 2, the first shutter 7, the first detector 807, the second detector 809 and the zoom controller 810 are respectively connected with the control processing system (C).
The reflective yellowing measurement system (F) comprises N reflective yellowing measurement modules FMODLE which are same in structure and symmetrically distributed by taking the center of the spectacle lens 13 to be measured as the spherical center. And the detection direction of the reflective yellowness measurement module FMODULE and the optical axis direction of the spectacle lens 13 to be measured form 45 degrees +/-2 degrees or 85 degrees +/-2 degrees. The N reflection type yellowness measurement modules FMODULE are respectively connected with the control processing system (C).
The reflective yellowness measurement module FMODULE comprises: light emitted by the white light LED array F1 is homogenized by the light homogenizer F2, enters the second collimation system F4 through the sixth lens F3, is spatially filtered by the second aperture diaphragm F5, and is incident on the spectacle lens to be tested 13 on the production line 12 through the second shutter F7. The red light part of the light reflected and scattered by the spectacle lens 13 to be measured is incident on the third detector F8 through the fourth filter F7, and the blue light part is incident on the fourth detector F10 through the fifth filter F9. The white light LED array F1, the third detector F8 and the fourth detector F10 are respectively connected with the control processing system (C).
The lens position detection system (W) comprises a signal generator 10 and a signal detector 11, and the signal generator 10 and the signal detector 11 are respectively connected with the control processing system (C).
The lens sorting system (S) includes a retractable robot arm and a storage box for temporarily storing the defective ophthalmic lens.
The distance range between the first lens 801 and the spectacle lens 13 to be measured is 2-10 cm.
The red LED array 1 may adopt 1 LED or an array of n × n (n is 1, 2, 3 … …) LEDs, and the central wavelength range of the LEDs is 650nm ± 50 nm.
The blue LED array 2 may adopt 1 LED or an array of n × n (n is 1, 2, 3 … …) LEDs, and the central wavelength range of the LEDs is 450nm ± 50 nm.
The first collecting lens 4 is a positive lens, and the focal length ranges from 5cm to 50 cm.
The light-transmitting aperture of the first aperture diaphragm 6 is adjustable, and the adjustable range is 1 cm-7 cm.
The second lens 801 is a positive lens, the third lens 802 is a positive lens, the fourth lens 803 is a negative lens, and the fifth lens 804 is a positive lens.
The first optical filter 805 is a reflective high-pass filter, the cut-off wavelength is 550nm +/-50 nm, the transmittance of light with the wavelength of more than 600nm is greater than 95%, and the reflectance of light with the wavelength of less than 500nm is greater than 90%.
The second filter 806 is a band-pass filter, the light-transmitting range is 400nm to 500nm, and the average transmittance is greater than 90%.
The third optical filter 808 is a band-pass optical filter, the light-passing range is 600nm to 700nm, and the average transmittance is more than 90%.
The sixth lens F3 is a positive lens with a focal length ranging from 5cm to 50 cm.
The fourth optical filter F7 is a band-pass filter, the light-passing range is 600nm to 700nm, and the average transmittance is more than 90%.
The fifth optical filter F9 is a band-pass optical filter, the light-passing range is 400nm to 500nm, and the average transmittance is more than 90%.
When the spectacle lens to be measured is not placed, the signal sent by the signal generator 10 enters the signal detector 11 after passing through the production line 12.
The device for on-line measurement of the yellowing degree of the spectacle lens has the working principle as follows:
firstly, system initialization:
1. and the red LED array 1 and the blue LED array 2 and the white LED array F1 are lightened to ensure stable light emission.
2. When the spectacle lens 13 to be tested is not placed, the first shutter 7 is opened, the second shutter F7 is closed, light emitted by the red LED array 1 and the blue LED array 2 is collimated by uniform light and then is directly collected to the first detector 807 and the second detector 809 by the zoom lens B, and at the moment, the first detector 807 and the second detector 809 output signals power1 and power2 respectively.
3. A standard white board is placed in an area to be detected, a second shutter F7 is opened, a first shutter 7 is closed, light emitted by a white light LED array F1 is collimated through uniform light and then reflected and scattered by the standard white board, and a part of light is transmitted to a third detector F8 and a fourth detector F10 through a fourth optical filter F7 and a fifth optical filter F9 respectively. The third detector F8 and the fourth detector F10 output signals power3 and power4, respectively.
4. The spectacle lens 13 to be measured is placed in an area to be measured, light emitted by the red LED array 1 and the blue LED array 2 passes through the spectacle lens 13 to be measured after being collimated by even light, and the spectacle lens 13 to be measured has certain diopter, so that the originally collimated light can generate a dispersing effect. The zoom lens B is continuously zoomed by the zoom controller 810, and the position where the output value of the first probe 807 is maximum is found within the entire zoom range. When the zoom lens B is at the position, the divergent light can be effectively collected to the first detector 807 and the second detector 809, and the zoom lens B keeps the position fixed in the batch detection.
Transmission yellowing measurement
1. In the production process of the spectacle lens, the spectacle lens 13 to be measured advances on the production line 12, when the front edge of the spectacle lens 13 to be measured moves between the signal generator 10 and the signal detector 11, the signal detector 11 cannot detect the signal sent by the signal generator 10 due to the shielding of the spectacle lens 13 to be measured, and at the moment, the signal detector 11 outputs a low-level signal to indicate that the spectacle lens to be measured has moved to a proper position, and the device is triggered to measure.
2. After receiving the low level signal sent by the signal detector 11, the control processing system (C) opens the first shutter 7, so that the light sent by the red LED array 1 and the blue LED array 2 passes through the spectacle lens 13 to be detected after being collimated by uniform light, and is further effectively collected to the first detector 807 and the second detector 809 by the zoom lens B. The first detector 807 and the second detector 809 output signals power5 and power6, respectively.
Third, data processing
And (3) calculating the yellowing degree of the lens according to the formula of 1- (power6/power2)/(power5/power1), comparing the yellowing degree with a set threshold value, and if the yellowing degree is less than the threshold value, indicating that the quality of the spectacle lens is qualified. This measurement is ended. If the value is larger than the threshold value, the quality of the lens is possibly unqualified, and the reflective yellowing degree measurement process is started.
Four, reflection type yellowing measurement
And after the control processing system (C) judges that the transmission type yellowing degree is unqualified, the second shutter F7 is opened, at the moment, light emitted by the white light LED array F1 is collimated by uniform light and then is irradiated onto the lens 13 to be detected, and after the light is reflected and scattered by the lens 13 to be detected, a part of the light is irradiated onto the third detector F8 and the fourth detector F10 through the fourth optical filter F7 and the fifth optical filter F9 respectively. At the same time, the first shutter 7 is closed, and the light from the red LED array 1 and the blue LED array 2 cannot strike the spectacle lens 13 to be measured. It is ensured that the light received at the third detector F8 and the fourth detector F10 is both reflected and scattered light and no transmitted light. The third detector F8 and the fourth detector F10 output signals power7(1) and power8(1), respectively.
If the reflective yellowing measurement system (F) comprises N reflective yellowing measurement modules FMODULE. Then a series of detector output signals power7(2), power8(2), power7(3), power8(3) … … power7(N), and power8(N) can be obtained simultaneously.
By the formula YInverse directionN reflection yellowness Y can be obtained by 1-power8(N)/power7(N)Inverse direction(N) N reflection yellowness Y is needed for N reflection yellowness factors which may cause strong stray signals received by partial detectors due to mirror reflectionInverse direction(N) statistical analysis was performed. And eliminating obvious deviation from the average value. For residual reflection yellowing degree YInverse direction(N) averaging to obtain YInverse equilibrium. If Y isInverse equilibriumIf the value is less than (1-power4/power3), the quality of the lens is qualified, and the measurement is finished. If Y isInverse equilibriumIf the value is greater than (1-power4/power3), the quality of the lens is not qualified, and a screening procedure is started.
Fifthly, screening out procedure
After the quality of the lenses is determined to be unqualified through the measurement of the transmission type and the reflection type, the control processing system (C) starts a screening program, sends an instruction to the mechanical arm, the mechanical arm pops up automatically, the unqualified lenses are pushed down from the production line 12, and the lenses fall into a storage box beside the production line. If the number of unqualified spectacle lenses exceeds a certain threshold value, the system automatically gives an alarm to warn that the product of the batch has low qualification rate, and the quality of raw materials needs to be checked in time or the processing technological parameters need to be optimized.
The above steps are completely automatically processed under the control of the control processing system (C), and unqualified spectacle lenses can be quickly and effectively screened out.
The invention has the beneficial effects that:
1. the invention can realize real-time online detection of the yellowing degree of the spectacle lens on the flowing production line and real-time screening of unqualified products.
2. The invention adopts the detector to collect the broad spectrum once, thus greatly shortening the detection time.
3. The invention adopts two modes of transmission and reflection to measure the yellowing degree of the spectacle lens, thereby increasing the reliability and the accuracy of the device.
4. The light source of the invention adopts the light uniformizing device to uniformize light, so that the uniformity of the light source is better. Meanwhile, the pulse type illumination mode is adopted, so that the instability of signals generated by the jitter of the ambient light and the sample to be measured is effectively avoided, and the measurement accuracy is improved.
5. The yellowing degree calculation adopts a wide spectrum (400-500 nm and 600-700 nm) integration mode, and the data is more accurate.
6. The invention can realize automatic screening of unqualified products, greatly saves labor, and can give an alarm in time if more unqualified products exist in the production line, so as to warn that the batch of products have low qualification rate and need to check the quality of raw materials or optimize processing technological parameters in time.
Drawings
FIG. 1 is a schematic structural view of a device for measuring yellowness of an ophthalmic lens
FIG. 2 is a schematic view of a FMODULE structure of a reflection-type yellowness measurement module
FIG. 3 is a schematic diagram of FMODULE spatial distribution of a reflection-type yellowness measurement module
FIG. 4 is a schematic view of the working state of an apparatus for measuring the yellowing of ophthalmic lenses
Detailed Description
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.
FIG. 1 is a schematic diagram of the structure of an embodiment of the present invention for implementing an apparatus for measuring the yellowness of an ophthalmic lens. The device comprises five subsystems, namely a transmission type yellowing degree measuring system (T), a reflection type yellowing degree measuring system (F), a lens position detecting system (W), a control processing system (C) and a lens screening system (S).
The transmission-type yellowing degree measurement system (T) comprises: light emitted by the red LED array 1 and the blue LED array 2 is homogenized by the homogenizer 3, enters the first collimating system 5 through the first lens 4, is spatially filtered by the first aperture diaphragm 6, and then is applied to a spectacle lens 13 to be measured on the production line 12 through the first shutter 7. A slit is arranged in the middle of the production line 12 to ensure that light emitted by the red LED array 1 and the blue LED array 2 can reach the spectacle lens to be measured. After light transmitted from the spectacle lens 13 to be measured sequentially passes through the zoom lens B composed of the second lens 801, the third lens 802, the fourth lens 803 and the fifth lens 804, a red light part in a spectrum enters the first detector 807 through the transmission of the first optical filter 805, and is collected, and a blue light part in the spectrum enters the second detector 809 through the reflection of the first optical filter 805 and the third optical filter 808. The zoom lens B can realize a zoom function through the zoom controller 810, and can ensure that all light transmitted from the spectacle lens 13 to be measured with different diopters is collected by the detector. The red LED array 1, the blue LED array 2, the first shutter 7, the first detector 807, the second detector 809 and the zoom controller 810 are respectively connected with the control processing system (C).
As shown in fig. 2, fig. 2 is a schematic structural diagram of a reflective yellowness measurement module FMODULE. The reflective yellowness measurement module FMODULE comprises: light emitted by the white light LED array F1 is homogenized by the light homogenizer F2, enters the second collimation system F4 through the sixth lens F3, is spatially filtered by the second aperture diaphragm F5, and is incident on the spectacle lens to be tested 13 on the production line 12 through the second shutter F7. The red light part of the light reflected and scattered by the spectacle lens 13 to be measured is incident on the third detector F8 through the fourth filter F7, and the blue light part is incident on the fourth detector F10 through the fifth filter F9. The white light LED array F1, the third detector F8 and the fourth detector F10 are respectively connected with the control processing system (C).
The lens position detection system (W) comprises a signal generator 10 and a signal detector 11, and the signal generator 10 and the signal detector 11 are respectively connected with the control processing system (C).
The lens sorting system (S) includes a retractable robot arm and a storage box for temporarily storing the defective ophthalmic lens.
The distance range between the first lens 801 and the spectacle lens 13 to be measured is 2-10 cm.
The red LED array 1 may adopt 1 LED or an array of n × n (n is 1, 2, 3 … …) LEDs, and the central wavelength range of the LEDs is 650nm ± 50 nm.
The blue LED array 2 may adopt 1 LED or an array of n × n (n is 1, 2, 3 … …) LEDs, and the central wavelength range of the LEDs is 450nm ± 50 nm.
The light uniformizing device adopts a 1mm double-sided frosted PC light uniformizing sheet
The first collecting lens 4 is a positive lens, and the focal length ranges from 5cm to 50 cm.
The light-transmitting aperture of the first aperture diaphragm 6 is adjustable, and the adjustable range is 1 cm-7 cm.
The second lens 801 is a positive lens, the third lens 802 is a positive lens, the fourth lens 803 is a negative lens, and the fifth lens 804 is a positive lens.
The first optical filter 805 is a reflective high-pass filter, the cut-off wavelength is 550nm +/-50 nm, the transmittance of light with the wavelength of more than 600nm is greater than 95%, and the reflectance of light with the wavelength of less than 500nm is greater than 90%.
The second filter 806 is a band-pass filter, the light-transmitting range is 400nm to 500nm, and the average transmittance is greater than 90%.
The third optical filter 808 is a band-pass optical filter, the light-passing range is 600nm to 700nm, and the average transmittance is more than 90%.
The reflective yellowing measurement system (F) includes N (N is 2, 4, 6 … …) reflective yellowing measurement modules FMODULE having the same structure and symmetrically distributed by taking the center of the spectacle lens 13 to be measured as the spherical center. In the schematic diagram of the embodiment shown in fig. 1, N is 4, that is, 901, 902, 903, and 904 are 4 reflective yellowness measurement modules fmodulle having the same structure but different positions. And the detection direction of the reflective yellowness measurement module FMODULE and the optical axis direction of the spectacle lens 13 to be measured form 45 degrees +/-2 degrees or 85 degrees +/-2 degrees. The N reflection type yellowness measurement modules FMODULE are respectively connected with the control processing system (C). To express the spatial distribution of the reflective yellowness measurement module FMODULE more intuitively, fig. 3 may be referred to, where fig. 3 is a schematic diagram of the spatial distribution of the reflective yellowness measurement module FMODULE when N takes a value of 8.
The sixth lens F3 is a positive lens with a focal length ranging from 5cm to 50 cm.
The fourth optical filter F7 is a band-pass filter, the light-passing range is 600nm to 700nm, and the average transmittance is more than 90%.
The fifth optical filter F9 is a band-pass optical filter, the light-passing range is 400nm to 500nm, and the average transmittance is more than 90%.
When the spectacle lens to be measured is not placed, the signal sent by the signal generator 10 enters the signal detector 11 after passing through the production line 12.
The working principle and the process of the device for measuring the yellowing degree of the spectacle lens comprise the following steps:
firstly, system initialization:
1. and the red LED array 1 and the blue LED array 2 and the white LED array F1 are lightened to ensure stable light emission.
2. When the spectacle lens 13 to be tested is not placed, the first shutter 7 is opened, the second shutter F7 is closed, light emitted by the red LED array 1 and the blue LED array 2 is collimated by uniform light and then is directly collected to the first detector 807 and the second detector 809 by the zoom lens B, and at the moment, the first detector 807 and the second detector 809 output signals power1 and power2 respectively.
3. A standard white board is placed in an area to be detected, a second shutter F7 is opened, a first shutter 7 is closed, light emitted by a white light LED array F1 is collimated through uniform light and then reflected and scattered by the standard white board, and a part of light is transmitted to a third detector F8 and a fourth detector F10 through a fourth optical filter F7 and a fifth optical filter F9 respectively. The third detector F8 and the fourth detector F10 output signals power3 and power4, respectively.
4. The spectacle lens 13 to be measured is placed in an area to be measured, light emitted by the red LED array 1 and the blue LED array 2 passes through the spectacle lens 13 to be measured after being collimated by even light, and the spectacle lens 13 to be measured has certain diopter, so that the originally collimated light can generate a dispersing effect. The zoom lens B is continuously zoomed by the zoom controller 810, and the position where the output value of the first probe 807 is maximum is found within the entire zoom range. When the zoom lens B is at the position, the divergent light can be effectively collected to the first detector 807 and the second detector 809, and the zoom lens B keeps the position fixed in the batch detection.
Transmission yellowing measurement
1. In the production process of the spectacle lens, the spectacle lens 13 to be measured advances on the production line 12, when the front edge of the spectacle lens 13 to be measured moves between the signal generator 10 and the signal detector 11, the signal detector 11 cannot detect the signal sent by the signal generator 10 due to the shielding of the spectacle lens 13 to be measured, and at the moment, the signal detector 11 outputs a low-level signal to indicate that the spectacle lens to be measured has moved to a proper position, and the device is triggered to measure.
2. After receiving the low level signal sent by the signal detector 11, the control processing system (C) opens the first shutter 7, so that the light sent by the red LED array 1 and the blue LED array 2 passes through the spectacle lens 13 to be detected after being collimated by uniform light, and is further effectively collected to the first detector 807 and the second detector 809 by the zoom lens B. The first detector 807 and the second detector 809 output signals power5 and power6, respectively.
Third, data processing
And (3) calculating the yellowing degree of the lens according to the formula of 1- (power6/power2)/(power5/power1), comparing the yellowing degree with a set threshold value, and if the yellowing degree is less than the threshold value, indicating that the quality of the spectacle lens is qualified. This measurement is ended. If the value is larger than the threshold value, the quality of the lens is possibly unqualified, and the reflective yellowing degree measurement process is started.
Four, reflection type yellowing measurement
And after the control processing system (C) judges that the transmission type yellowing degree is unqualified, the second shutter F7 is opened, at the moment, light emitted by the white light LED array F1 is collimated by uniform light and then is irradiated onto the lens 13 to be detected, and after the light is reflected and scattered by the lens 13 to be detected, a part of the light is irradiated onto the third detector F8 and the fourth detector F10 through the fourth optical filter F7 and the fifth optical filter F9 respectively. At the same time, the first shutter 7 is closed, and the light from the red LED array 1 and the blue LED array 2 cannot strike the spectacle lens 13 to be measured. It is ensured that the light received at the third detector F8 and the fourth detector F10 is both reflected and scattered light and no transmitted light. The third detector F8 and the fourth detector F10 output signals power7(1) and power8(1), respectively.
If the reflective yellowing measurement system (F) comprises N reflective yellowing measurement modules FMODULE. Then a series of detector output signals power7(2), power8(2), power7(3), power8(3) … … power7(N), and power8(N) can be obtained simultaneously.
By the formula YInverse directionN reflection yellowness Y can be obtained by 1-power8(N)/power7(N)Inverse direction(N) N reflection yellowness Y is needed for N reflection yellowness factors which may cause strong stray signals received by partial detectors due to mirror reflectionInverse direction(N) statistical analysis was performed. And eliminating obvious deviation from the average value. For residual reflection yellowing degree YInverse direction(N) averaging to obtain YInverse equilibrium. If Y isInverse equilibriumIf the value is less than (1-power4/power3), the quality of the lens is qualified, and the measurement is finished. If Y isInverse equilibriumIf the value is greater than (1-power4/power3), the quality of the lens is not qualified, and a screening procedure is started.
Fifthly, screening out procedure
After the quality of the lenses is determined to be unqualified through the measurement of the transmission type and the reflection type, the control processing system (C) starts a screening program, sends an instruction to the mechanical arm, the mechanical arm pops up automatically, the unqualified lenses are pushed down from the production line 12, and the lenses fall into a storage box beside the production line. If the number of unqualified spectacle lenses exceeds a certain threshold value, the system automatically gives an alarm to warn that the product of the batch has low qualification rate, and the quality of raw materials needs to be checked in time or the processing technological parameters need to be optimized.
The above steps are completely automatically processed under the control of the control processing system (C), and unqualified spectacle lenses can be quickly and effectively screened out.
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 (8)

1. A device for measuring the yellowing of spectacle lenses is characterized by comprising a transmission type yellowing measuring system (T), a reflection type yellowing measuring system (F), a lens position detecting system (W), a control processing system (C) and a lens screening system (S);
the transmission-type yellowing degree measurement system (T) comprises: light emitted by the red LED array (1) and the blue LED array (2) is homogenized by the first homogenizer (3), enters the first collimation system (5) through the first lens (4), is spatially filtered by the first small-hole diaphragm (6), and then is emitted onto a spectacle lens (13) to be tested on the production line (12) through the first shutter (7); a slit is arranged in the middle of the production line (12) to ensure that light emitted by the red LED array (1) and the blue LED array (2) can reach the spectacle lens to be tested; after light transmitted by the spectacle lens (13) to be tested sequentially passes through a zoom lens (B) consisting of a second lens (801), a third lens (802), a fourth lens (803) and a fifth lens (804), red light in a spectrum enters a first detector (807) through the transmission of a first optical filter (805) and is collected, and blue light in the spectrum enters a second detector (809) through the reflection of the first optical filter (805) and the third optical filter (808) and is collected; the zoom lens (B) can realize a zoom function through the zoom controller (810), so that light transmitted by the spectacle lens (13) to be detected with different diopters can be collected by the detector; the red LED array (1), the blue LED array (2), the first shutter (7), the first detector (807), the second detector (809) and the zoom controller (810) are respectively connected with the control processing system (C);
the reflective yellowing measurement system comprises N reflective yellowing measurement modules which are of the same structure and symmetrically distributed by taking the center of a spectacle lens (13) to be measured as a spherical center, and the detection direction of each reflective yellowing measurement module and the optical axis direction of the spectacle lens (13) to be measured form an angle of 45 degrees +/-2 degrees or an angle of 85 degrees +/-2 degrees;
the reflection type yellowness measuring module comprises: the white light LED array (F1), the emitted light is homogenized by a second light homogenizer (F2), enters a second collimation system (F4) through a sixth lens (F3), is subjected to spatial filtering by a second pinhole diaphragm (F5), is incident on a spectacle lens to be detected (13) on the assembly line (12) through a second shutter (F7), the red light part in the light reflected and scattered by the spectacle lens to be detected (13) is incident on a third detector (F8) through a fourth optical filter (F7), and the blue light part is incident on a fourth detector (F10) through a fifth optical filter (F9); the white light LED array (F1), the third detector (F8) and the fourth detector (F10) are respectively connected with the control processing system (C);
the lens position detection system (W) comprises a signal generator (10) and a signal detector (11), and the signal generator (10) and the signal detector (11) are respectively connected with the control processing system (C); when the spectacle lens to be measured is not placed, a signal sent by the signal generator (10) enters the signal detector (11) after passing through the production line (12);
the second lens (801) is a positive lens, the third lens (802) is a positive lens, the fourth lens (803) is a negative lens, and the fifth lens (804) is a positive lens;
the first optical filter (805) is a reflection type high-pass optical filter, the cut-off wavelength is 550nm +/-50 nm, the transmittance of light with the wavelength of more than 600nm is more than 95%, and the reflectivity of light with the wavelength of less than 500nm is more than 90%;
the second optical filter (806) is a band-pass optical filter, the light-passing range is 400nm to 500nm, and the average transmittance is more than 90%;
the third optical filter (808) is a band-pass optical filter, the light-passing range is 600nm to 700nm, and the average transmittance is more than 90%.
2. A device for the measurement of the yellowing of ophthalmic lenses according to claim 1, wherein the second lens (801) is at a distance of 2 to 10cm from the ophthalmic lens (13) to be measured.
3. The device for measuring yellowness of ophthalmic lenses according to claim 1, wherein said red LED array (1) uses an array of n x n (n =1, 2, 3 … …) LEDs, the central wavelength range of which is 650nm ± 50 nm.
4. The device for measuring yellowness of ophthalmic lenses according to claim 1, wherein said array of blue LEDs (2) is an array of n × n (n =1, 2, 3 … …) LEDs having a central wavelength in the range of 450nm ± 50 nm.
5. A device for the measurement of the yellowing of ophthalmic lenses according to claim 1, wherein the first lens (4) is a positive lens having a focal length in the range of 5cm to 50 cm;
the light-transmitting aperture of the first aperture diaphragm (6) is adjustable, and the adjustable range is 1 cm-7 cm.
6. The device for measuring the yellowing of the spectacle lens according to claim 1, wherein the reflective yellowing measurement system (F) comprises N reflective yellowing measurement modules which are symmetrically distributed by taking the center of the spectacle lens (13) to be measured as the spherical center and have the same structure, the detection direction of the reflective yellowing measurement modules forms 45 ° ± 2 ° or 85 ° ± 2 ° with the optical axis direction of the spectacle lens (13) to be measured, and the N reflective yellowing measurement modules are respectively connected with the control processing system (C).
7. The device for the measurement of the yellowness index of an ophthalmic lens according to claim 1, characterized in that said sixth lens (F3) is a positive lens with a focal length ranging from 5cm to 50 cm;
the fourth optical filter (F7) is a band-pass optical filter, the light-passing range is 600nm to 700nm, and the average transmittance is more than 90%;
the fifth filter (F9) is a band-pass filter, the light-passing range is 400nm to 500nm, and the average transmittance is more than 90%.
8. The device for the measurement of the yellowness index of ophthalmic lenses according to claim 1, characterized in that it further comprises a lens screening system (S) comprising a telescopic mechanical arm able to move a rejected ophthalmic lens inside a storage box and a storage box for storing rejected ophthalmic lenses.
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