CN200945199Y - Novel computer-aided colorimeter for oral cavity based on semiconductor color-sensitive sensing technology - Google Patents
Novel computer-aided colorimeter for oral cavity based on semiconductor color-sensitive sensing technology Download PDFInfo
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- CN200945199Y CN200945199Y CN 200620028886 CN200620028886U CN200945199Y CN 200945199 Y CN200945199 Y CN 200945199Y CN 200620028886 CN200620028886 CN 200620028886 CN 200620028886 U CN200620028886 U CN 200620028886U CN 200945199 Y CN200945199 Y CN 200945199Y
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Abstract
The utility model relates to a new type intraoral color comparator based on the semiconductor color sensing technique, which comprises a signal detecting part, a signal processing part and a result displaying part; wherein, the signal detecting part receives the reflex signals from the oral tooth color through two silicon color sensors with two PN junctions with different junction depths and transfers optical signals into two current signals corresponding to the wavelength of the incoming ray; the signal processing part consists of two logarithmic amplifiers and a differential amplifier and outputs a voltage signal concerning the reflex signals of the oral tooth color; and the result displaying part consists of an analog-to-digital conversion circuit, an interface circuit, a CPU, a ROM and a display and is used to transfer the voltage signal from the signal processing part into a digital signal may be identified by computer and then to compare the digital signal with the standard data stored in the computer memory, thereby having color comparison information shown on the display. The utility model has the advantages of free from interference of external environmental, high accuracy, convenient operation, practical value and so on.
Description
Technical field
This patent belongs to the optical, mechanical and electronic integration field, is specifically related to the novel oral cavity computer-aided colorimeter of the quick sensing technology of based semiconductor color of high sensitivity, high reliability in a kind of electric physiological detection, custodial care facility and the pick off.
Background technology
It is that all lay-by materials are carried out colour examining in advance under standard conditions that computer selects color (CCS) technology, and the result is made the data base, retrieves and its most close material at a certain color then.CCS is as a kind of objective colorimetric method, be used widely at industrial circles such as printing and dyeing, that it has is objective, quick, accurately and not be subjected to the characteristics of environmental disturbances, begun to attempt being applied to the clinical color matching of dentistry in the world, because the present research in this regard of China still belongs to blank, therefore, the practicality of research CCS on clinical oral has great importance.The colorimetric technology is very important in Oral Repair, in order to make the beautiful teeth after repairing, coordinates with oral environment, and the doctor need measure the color of patients teeth, selects to have identical or the most close color repairing material then, and tooth is repaired.Present clinical employing be artificial vision's colorimetric method, whether the color of determining tooth and repair materials is consistent, quite difficult, because main repair materials is translucent, appearing surface color of base portion dentin color is influential, and the natural teeth color has the color change of dividing a word with a hyphen at the end of a line gradually at different positions, has so just caused very big difficulty to colorimetric.Again because the color comparison of naked eye method depends on accurate understanding and the grasp of doctor to color, also can be subjected to the influence of subjective factorss such as light source, surrounding and emotion simultaneously, therefore have a large amount of correlational studyes to point out that color comparison of naked eye can cause tangible colorimetric error, and repetitive rate is lower.Often occur repairing the position different with the tooth environmental colors and cause inharmonious, influence repairing effect.Our product is developed for the demand that satisfies present China clinical oral market.
At present, have only German VITA company at the beginning of 21 century, to release a kind of personal computer colour comparatour abroad, and sold in Chinese market since 2004, it carries out colour examining by measuring reflecting spectrum, thereby it is bigger influenced by external condition, and the price comparison costliness, and this type instrument development, do not appear in the newspapers as yet at home.For this reason, this project proposes the computer-aided colorimeter that broad prospect of application is arranged that independent intellectual property right is arranged of a kind of practicality of development.The instrument that we developed has bigger price advantage with external like product, and also is not less than external product on performance; Therefore, this project product can also can export by the substituting import one product in a large number.
The utility model content
The purpose of this utility model is to provide a kind of computer-aided colorimeter that can use that computer selects color technology and the quick sensing technology of quasiconductor color that combines on oral repairing clinic.
The described computer-aided colorimeter of this patent can be used for replacing the artificial vision's colorimetric method that uses clinically at present, and this instrument has small portable, simple to operate, the characteristics that can allot accurate color in a short period of time.
Computer-aided colorimeter described in the utility model is by signal detection, signal processing, the display part constitutes as a result.
The signal detection part is made up of the silicon color-sensitive transducer with 2 different junction depth PN junctions, and its reception comes from the reflected light signal of Buccodental color, and converts optical signal to two current signals corresponding with lambda1-wavelength;
Signal processing is made up of two logafiers and a differential amplifier, two current signals that come from silicon color-sensitive transducer connect the inverting input of logafier respectively, the output voltage of two logafiers as the input signal of differential amplifier (as shown in Figure 4, one end ground connection of differential amplifier), differential amplifier is used to realize the subtraction to two input voltages, the voltage signal that its output is relevant with the reflected light signal of Buccodental color;
As a result the display part by analog-digital converter circuit, interface circuit, central cpu, deposit all devices and display is formed, it is to set up earlier input voltage and light-cured resin color normal data curve one to one in computer, by recording magnitude of voltage, provide colorimetric information again.After the voltage signal that promptly comes from the color of teeth information that at every turn records of signal processing converts the digital signal that computer can discern to, compare with the normal data that exists computer to deposit Zhu Qizhong, thereby in display, provide the colorimetric information of each measurement result.
The key technology of this instrument is the development of color sensitive sensor and the exploitation of software system, and this patent is applied to silicon color-sensitive transducer measure color of teeth more accurately in the used for stomatological repair colour comparatour first, to reach best repairing effect.
Because this patent employing logarithmic transformation element and differential amplifier are realized the subtraction to two input voltages, as long as measure output voltage, just can measure colouring information according to the standard curve of voltage of in Computer Database, having set up and optical wavelength (colouring information) respective value with the corresponding Buccodental of output voltage.Have and be not subjected to external environmental interference accuracy height, advantage such as convenient and practical, overcome other colour comparatours and be subjected to the big shortcoming of ectocine owing to directly measuring frequency spectrum.This type instrument development is not appeared in the newspapers at home as yet.
The technical specification of this patent product:
Operating temperature range: 0-70 ℃, spectral response range: 400-700nm, spectral resolution: 25nm, response time＜15 second, recovery time＜30 second, complete machine weighs less than 3kg.
Description of drawings
Fig. 1: silicon color-sensitive transducer structural representation;
Fig. 2: silicon color-sensitive transducer equivalent circuit diagram;
Fig. 3: silicon color-sensitive transducer with respect to the absorption sensitivity sketch map of different two PN junctions of incident illumination distance to the light of different wave length;
Fig. 4: computer-aided colorimeter integrated circuit block diagram;
Fig. 5: the software system functional-block diagram of this patent.
The described silicon color-sensitive transducer of this patent is that the different PN junction Zu of two junction depths of You becomes, and as shown in Figure 1, electrode 11,12,13 is respectively three aluminium electrodes, Yongs SiO2Zuo insulating barrier 14, it is take body material Si as optical filter, and 15,16,17 is respectively N+Mix the respectively owner of lost property and acceptor of Xing district, p type island region and N-type district, Zai silicon Zhong obtains N (light dope), P, N+(Chong doping) district. The reverberation that comes from the Ya tooth can be distinguished after inciding on two PN junctions of color sensitive sensor Dark, the shallow PN junction of Zai produces Yi photoelectric current, and the ratio of two photoelectric currents is Xiang corresponding Yu the incident light wavelength, and is logical (dark, shallow PN junction is for incident light or electrode 11,12 to cross dark, the shallow PN junction of incident light Zai of different wave length The ratio of two photoelectric currents that distance) produce is Yu the corresponding relation of wavelength can be surveyed monochromatic light, and also can distinguish Divide the polychromatic light of two different spectral compositions, namely aberration is distinguished. Have the external environmental interference of not being subjected to, the true Xing of Zhun height, side Just the You point such as practicality has overcome other colour comparatours You Yu Zhi and has connect and measure frequency spectrum and be subjected to the big shortcoming of ectocine.
As shown in Figure 1, N+-P-N is two P-N junction diodes. Shallow junction is (apart from incident light or electrode 11,12 distances From close to PN+The knot, Zai this patent Zhong is called shallow junction) diode PD1N+-P knot, the diode PD of dark knot (apart from the PN junction of incident light or electrode 11,12 distance, Zai this patent Zhong is called dark knot)2It is the P-N knot. Fig. 2 is The equivalent circuit diagram of this color sensitive sensor is penetrated (from the next only different wave length monochromatic light of Ya tooth reflection as incident illumination Compound) time, N+, P, N each zone and therebetween barrier region Zhong You photonic absorption. According to the optical property of silicon, It is big that it partially absorbs the Xi number to the short wavelength, complex light Zhong short wavelength's part Zai sensor Zhong through very short distance with regard to energy Xi harvests complete, and Yin this, the shallow junction photodiode is highly sensitive to short wavelength's light. And silicon partially absorbs the long wavelength Xi counts Xiao, and the transmission depth of long wavelength light is bigger, and its transmission depth of infrared light part can reach this look quick sensing by Yi Zhi The dark interface of device, as shown in Figure 3, Yin this, dark p n junction photodiode is highly sensitive to long wavelength light. Zai has Yi The Zhao of the complex light of the long scope of standing wave penetrates Xia the ratio I of the short circuit current of this device Zhong two Zhi photodiodes1/I
2Difference, I1The short circuit current of shallow diode, I2It is the short circuit current of dark junction diode. So short circuit according to device Current ratio, Wo can obtain the closely-related current signal of Yu lambda1-wavelength scope (Yan look Xin Xi). Zai determines Process conditions Xia, almost Zhi is Yu incident light Xin manner of breathing closes short-circuit current ratio, Zhe is Yi outstanding You point so that it Zai monochromatic light Yu polychromatic light distinguish the less interference that is subjected to change of external conditions.
As shown in Figure 4, two of color sensitive sensor Zhong photosensitive part PD1 and PD2 be connected two Zhi operation amplifier device IC1, The inverting input of IC2 is about to the imported use of operation amplifier device Zuo electric current. Be connected the anti-phase input of IC1, IC2 End is Yu two Zhi diode D1 between Zhi the output and D2 Yong Zuo logarithmic transformation Yuan spare, and they do not change PD1 during Zai work Xing Zhi with the short circuit current of PD2 can stably measure light wavelength in the broad range of Zai incident power Yin this, Also namely predicts the Yan look of Wu body or the Yan look of light. IC3 Wei Yi differential amplifier, Yong Yu realizes to two input voltages (namely The output voltage of IC1, IC2) subtraction. The output voltage V o of this signal acquisition circuit (λ) Yu different colours Relation between Zhi the wavelength can be represented by the formula
Vo(λ)＝Vo[lgI
SC2(λ)-lgI
SC1(λ)]R
2/R
1
Formula Zhong Vo is constant, and Isc1, Isc2 are respectively IC1, IC2 input current (R2、R
1Series resistance). Xian is right, Zhi Yao Measure output voltage V o (λ), just can be according to output voltage Yu the standard curve determination practical operation of light wavelength respective value The time incident the wavelength of color of light.
As shown in Figure 5, be the Xin display part branch of this patent, it adopts normal computer programming, groundwork Process can be described as: after the work beginning, computer program begins the Xi system is initialized, and has no progeny Zhong opening, and You Yu adopts Yang Wei high level interrupt, no so Xian judges the A/D EOC, the Zhu that carries out then the identification of Yan look is Yaoed data and is processed, Be linearization process, light source luminescent rate Xiu Zheng, gained number of colours Zi amount enters look-up routine, Zui after color value is sent into Xian shows or the keyboard handling procedure.
Interrupt handling routine: comprise sampling routine and keyboard handling procedure.
Handling procedure: comprise that linearization process, light source luminescent rate correction value are looked into and got, the judgement of color value is Yu control signal Output.
Appendage: comprise the key handling procedure, display routine.
The specific embodiment
Embodiment 1:
As shown in Figure 1, being the described silicon color-sensitive transducer structural representation of this patent, is by two PN junction (N that junction depth is different
+-P knot and P-N knot) form.Utilize semiconductor technology (MOCVD technology) preparation silicon color-sensitive transducer, boron (B) as the owner of lost property and nitrogen (N) as the acceptor doping material, by adulterated owner of lost property's concentration control heavy doping and light dope, the thickness of each layer is controlled by growth time, about 1 micron, as shown in Figure 1, electrode 11,12,13 is respectively three aluminum electrodes, uses SiO
2Make insulating barrier 14, zone 15,16,17 is respectively heavily doped N
+Type district, p type island region and lightly doped N type district are two P-N junction diodes.Shallow junction is (apart from incident illumination or the near PN of electrode 11,12 distances
+Knot is called shallow junction, by heavily doped N in this patent
+Type district 15 and p type island region 16 constitutes) diode PD
1Be N
+-P knot, the diode PD of dark knot (PN junction apart from incident illumination or electrode 11,12 distance is called dark knot in this patent, be made of p type island region 16 and lightly doped N type district 17)
2It is the P-N knot.
Fig. 2 is the equivalent circuit diagram of this color sensitive sensor, 11,12,13 respectively corresponding three aluminum electrodes.The reflected light that comes from tooth can produce a photoelectric current at dark, shallow PN junction respectively after inciding on the PN junction of two different junction depths of color sensitive sensor, and the ratio of two photoelectric currents and incident light wavelength are corresponding.When incident illumination shines (monochromatic compound from the only different wave length that the tooth reflection comes), N
+, photonic absorption is all arranged in each zone of P, N and therebetween barrier region.According to the optical property of silicon, it is big to the short-wavelength light absorptance, and the part of the short-and-medium wavelength of complex light just can absorb through very short distance in pick off and finish, and therefore, the shallow junction photodiode is highly sensitive to short wavelength's light.And silicon is little to the long wavelength light absorptance, and the transmission depth of long wavelength light is bigger, and its transmission depth of infrared light part can reach the dark interface of this color sensitive sensor always, and as shown in Figure 3, therefore, dark p n junction photodiode is highly sensitive to long wavelength light.Under the irradiation of complex light with certain wave-length coverage, the ratio I of the short circuit current of two photodiodes in this device
1/ I
2Difference, I
1Be the short circuit current of shallow diode, I
2It is the short circuit current of dark junction diode.So according to the short-circuit current ratio of device, we can obtain and the closely-related current signal of lambda1-wavelength scope (colouring information).Under the process conditions of determining, short-circuit current ratio is almost only relevant with incident illumination information, and this is an outstanding advantage, make it monochromatic light survey and polychromatic light distinguish the less interference that is subjected to change of external conditions.
As shown in Figure 4, be the described computer-aided colorimeter integrated circuit of this patent block diagram.Color sensitive sensor (its structure as shown in Figure 1) accepts to come from the reflected light (light source) of tooth, two photosensitive part PD in the color sensitive sensor
1And PD
2Be connected the inverting input of two operational amplifier IC1, IC2 (model OP37, Wuhan semiconductor factory), the other end ground connection of two operational amplifier IC1, IC2 is about to operational amplifier and does the imported use of electric current.Be connected the inverting input of IC1, IC2 and the D1 between the outfan and two diodes of D2 as the logarithmic transformation element, the inverting input of the forward termination operational amplifier of two diodes, the oppositely outfan of termination operational amplifier.They do not change PD when work
1And PD
2The character of short circuit current, therefore can in the very broad scope of incident power, stably measure light wavelength, also promptly predict the color of object or the color of light.The output signal that comes from two operational amplifier IC1, IC2 connects the input of differential amplifier IC3, the output head grounding of IC2, IC3 is a differential amplifier (model LF356, a Wuhan semiconductor factory), is used for the subtraction of realization to two input voltages (being the output voltage of IC1, IC2).Relation between the wavelength of output voltage V o of this signal acquisition circuit (λ) and different colours can be represented by the formula
Vo (λ)=Vo[lgI
SC2(λ)-lgI
SC1(λ)] R
2/ R
1(R
2, R
1Be series resistance)
Vo is a constant in the formula, and Isc1, Isc2 are respectively IC1, IC2 input current.Obviously, as long as measure the output voltage V o (λ) of differential amplifier, just can measure its color wavelength according to the respective value of output voltage and light wavelength.
Before this patent instrument uses, need set up the computer standard data base earlier, promptly earlier with various light-cured resins (29 kinds of light-cured resins of multiple tooth are inlayed in commonly used being used for) under specific background (during practical operation, tooth also will be under identical specific background, just can make the result accurate, as under the specific background of oral cavity clinic priming illumination light), be successively placed on the instrument of this patent before, at each light-cured resin (source reflection light), shallow, the dark PN junction (N of the silicon color-sensitive transducer of this instrument
+-P knot and P-N tie) all can produce two photoelectric currents, and then produce a voltage output signal at the outfan of differential amplifier IC3, with this signal process analog digital conversion (A/D), by importing computer (CPU) behind the interface circuit, again to the computer input colouring information of this moment, as color code of light-cured resin etc., make the magnitude of voltage that enters computer corresponding one by one with light-cured resin, further relevant information is stored in the memorizer of computer (ROM), thus the data base who in computer, has set up light-cured resin colouring information and voltage signal corresponding relation.Colour examining result (magnitude of voltage) with natural teeth similarly passes through silicon color-sensitive transducer then, operational amplifier IC1, IC2, differential amplifier IC3 is by (as shown in Figure 4) input computer (CPU) behind analog digital conversion (A/D) and the interface circuit, contrast with the information of voltage (chromatic value) of the light-cured resin that has had among the data base (ROM), and calculate mutual aberration between measured value and standard light cured resin respectively, select the most close light-cured resin of colourity according to minimum aberration, and the result shown by display device, instruct odontologist to wait work again by the edge that this result selects for use corresponding light-cured resin to carry out tooth.
The computer software that relates to this patent mainly forms with the compilation language compilation.By basic colour examining principle as can be known, Single Chip Microcomputer (SCM) system key data contents processing has linearization process, color identification.Software can be divided into four modules, that is:
Mastery routine: main program flow chart as shown in Figure 5.Program begins system is carried out initialization, have no progeny in opening, owing to be sampled as high level interrupt, so whether judge A/D conversion (using the 7135A/D transducer) earlier finishes, carrying out the key data of color identification then handles, be linearization process, gained color digital quantity enters look-up routine, color value is sent to show or the keyboard handling procedure at last.
Interrupt handling routine: comprise sampling routine and key handling procedure.
Handling procedure: comprise the judgement and the control signal output of linearization process, color value.
Appendage: comprise the key handling procedure, display routine etc.
The computer programming method that is suitable for this patent can have a variety of, this patent is not limited to wherein one or more, this partial content neither this patent the inventive point place, as long as can finish the goal of the invention of this patent, compare by the colouring information of these high-tech means of computer the light-cured resin of the colouring information of the tooth that records and standard, thereby provide than much accurate by eye-observation in the past to the operator, and the judgement conclusion that approaches the actual teeth color more gets final product.
Claims (2)
1, the novel oral cavity computer-aided colorimeter of the quick sensing technology of based semiconductor color by signal detection, signal processing, the display part constitutes as a result, is characterized in that:
(1) the signal detection part is made up of the silicon color-sensitive transducer with 2 different junction depth PN junctions, and its reception comes from the reflected light signal of Buccodental color, and converts optical signal to two current signals corresponding with lambda1-wavelength;
(2) signal processing is made up of two logafiers and a differential amplifier, two current signals that come from silicon color-sensitive transducer connect the inverting input of logafier respectively, the output voltage of two logafiers is as the input signal of differential amplifier, differential amplifier is used to realize the subtraction to two input voltages, the voltage signal that its output is relevant with the reflected light signal of Buccodental color;
(3) as a result the display part by analog-digital converter circuit, interface circuit, central cpu, deposit all devices and display is formed, after the voltage signal that comes from signal processing converts the digital signal that computer can discern to, compare with the data that exist computer to deposit Zhu Qizhong, thereby in display, provide colorimetric information.
2, the novel oral cavity computer-aided colorimeter of the quick sensing technology of based semiconductor color as claimed in claim 1, it is characterized in that: silicon color-sensitive transducer is with SiO
2Making insulating barrier, make electrode with aluminum, is optical filter with body material Si, heavily doped N
+The PN junction of type district and p type island region and p type island region and two different junction depths of lightly doped N type district formation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620028886 CN200945199Y (en) | 2006-06-08 | 2006-06-08 | Novel computer-aided colorimeter for oral cavity based on semiconductor color-sensitive sensing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620028886 CN200945199Y (en) | 2006-06-08 | 2006-06-08 | Novel computer-aided colorimeter for oral cavity based on semiconductor color-sensitive sensing technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200945199Y true CN200945199Y (en) | 2007-09-12 |
Family
ID=38732259
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620028886 Expired - Fee Related CN200945199Y (en) | 2006-06-08 | 2006-06-08 | Novel computer-aided colorimeter for oral cavity based on semiconductor color-sensitive sensing technology |
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| Country | Link |
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| CN (1) | CN200945199Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102760196A (en) * | 2011-04-25 | 2012-10-31 | 温宁 | Dental color fitting and color inquiry system |
| US10028810B2 (en) | 2013-04-29 | 2018-07-24 | 3M Innovative Properties Company | Method of capturing data from a patient's dentition and system for performing such method |
-
2006
- 2006-06-08 CN CN 200620028886 patent/CN200945199Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102760196A (en) * | 2011-04-25 | 2012-10-31 | 温宁 | Dental color fitting and color inquiry system |
| US10028810B2 (en) | 2013-04-29 | 2018-07-24 | 3M Innovative Properties Company | Method of capturing data from a patient's dentition and system for performing such method |
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