CN201917923U - Palm print instrument defogging system - Google Patents
Palm print instrument defogging system Download PDFInfo
- Publication number
- CN201917923U CN201917923U CN2010206623944U CN201020662394U CN201917923U CN 201917923 U CN201917923 U CN 201917923U CN 2010206623944 U CN2010206623944 U CN 2010206623944U CN 201020662394 U CN201020662394 U CN 201020662394U CN 201917923 U CN201917923 U CN 201917923U
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- prism
- conducting strip
- detect switch
- temperature
- instrument
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Abstract
The utility model relates to a palm print instrument defogging system which comprises a heating sheet, a heat-conducting strip, an electronic temperature control switch and a power supply, wherein the heat-conducting strip is adhered on a surface of a prism, where light can not penetrate through, and the heating sheet is fixed on the heat-conducting strip; and the electronic temperature control switch is fixed at a position close to the upper surface of the prism, and the electronic temperature control switch is communicated with the power supply and the heating sheet. With the system, the intelligent heating of the prism can be realized so as to keep the prism at a constant temperature all the time, the temperature difference of a human body and the prism is eliminated, the generation of fog can be avoided, the imaging quality can not be influenced, the heating efficiency is high, the noise is small and the effects of being sanitary and clean and having no pollution are achieved.
Description
Technical field
The utility model belongs to technical field of biometric identification, relates to a kind of palmmprint instrument demister system.
Background technology
Along with the development of biological identification technology, the palmmprint instrument
Be widely used in safety-security area, and the application of palmmprint instrument will be in the face of the different application environment, even rugged surroundings.In the application of palmmprint instrument, find, when environment temperature is lower, perhaps people's palm temperature is than higher the time, because palm and palmmprint instrument prism have the temperature difference, cause prism surface to have fog to generate, had a strong impact on the sharpness and the degree of accuracy of image acquisition, so the prism surface demist will be necessary function of palmmprint instrument.
The method of eliminating prism fog has a lot, as adhering to resistance wire at prism surface, heats prism by resistive heater, thereby eliminates fog; Perhaps use the mode of blowing hot wind, heat prism by constantly giving the prism blowing hot-air; Use chemical reagent to spread upon prism surface in addition, thereby elimination fog.But above method all has certain defective: the mode of resistance wire can make prism surface opaque, thereby the palmprint image that collects can include the picture of netted resistance wire; The mode efficiency of heating surface of blowing hot wind is low, and noise is very big; The mode of chemical reagent can influence the transmitance of prism, and chemical reagent will often be smeared in addition, and unhygienic.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of temperature difference that can effectively eliminate people's body surface and prism, and does not influence that image quality, efficiency of heating surface height, noise are little, the palmmprint instrument demister system of hygiene.
In order to solve the problems of the technologies described above, palmmprint instrument demister system of the present utility model comprises heating plate, conducting strip, electron temperature detect switch, power supply; On the face of described conducting strip attached to the obstructed light of prism, heating plate is fixed on the conducting strip; Electron temperature detect switch is fixed on the position of adjacent prisms upper surface, and is communicated with power supply and heating plate by electron temperature detect switch.
Described heating plate adopts the PTC thermistor.
When demister system is worked, at first electron temperature detect switch is discerned the Current Temperatures of prism earlier, if the Current Temperatures of the prism of electron temperature detect switch induction is less than the design temperature of electron temperature detect switch, electron temperature detect switch is in closure state so, heating plate begins to heat to conducting strip, conducting strip is with the heat transferred prism, thus the heating purposes of realization prism.When the temperature of electron temperature detect switch induction rose to the design temperature of electron temperature detect switch, electronic temperature control opened the light circuit is disconnected, and this moment, heating plate stopped heating.When the temperature of the prism of electron temperature detect switch induction drops to when being lower than design temperature, start heating once more; So circulation, thus make prism remain on a stationary temperature.
People's palm temperature generally can be above 40 ℃ according to the different maximum temperatures with health of environment, if we are heated to 30～40 ℃ according to the environment for use difference with the temperature of prism surface, will eliminate the fog that causes because the temperature of prism is lower than palm temperature so.The utility model has been realized the intelligence heating of prism, makes prism remain at a stationary temperature, has eliminated the temperature difference of people's body surface and prism, has avoided the generation of fog, and has not influenced image quality, and efficiency of heating surface height, noise is little, hygiene is pollution-free.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is a palmmprint instrument demister system synoptic diagram of the present utility model.
Fig. 2 is the right view of Fig. 1.
Embodiment
As shown in Figure 1, 2, palmmprint instrument demister system of the present utility model comprises heating plate 11,21,31, conducting strip 12,22,32, electron temperature detect switch 7, power supply 6; The prism 1 of described palmmprint instrument is a right-angle prism, on three faces of conducting strip 12,22,32 attached to the obstructed light of prism; Heating plate 11,21,31 adopts the PTC thermistor, and three PTC thermistors are separately fixed on the conducting strip 12,22,32; Electron temperature detect switch 7 is fixed on the position of adjacent prisms 1 upper surface, and is communicated with power supply 6 and heating plate 11,21,31 by electron temperature detect switch 7.
The preset temperature of electron temperature detect switch 7 will be higher than the predetermined temperature of prism 1 upper surface, and this preset temperature can obtain by test several times: on the conducting strip 22 of electron temperature detect switch 7 attached to prism 1 side; Open heating system, the temperature of monitoring prism 1 upper surface and the temperature of 7 thermal contact conductance sheets of electron temperature detect switch, when prism 1 upper surface temperature reaches predetermined temperature, read the temperature of 7 thermal contact conductance sheets of electron temperature detect switch, this temperature value can be set to the preset temperature of electron temperature detect switch 7.For accurately, can repeatedly test, try to achieve the preset temperature of mean value as electron temperature detect switch.For example, predetermined prism 1 upper surface medial temperature is 37 degree; Reach 37 when spending when monitoring prism 1 upper surface medial temperature, the reading of the electron temperature detect switch 7 that reads is 40 degree, and then the preset temperature of electron temperature detect switch 7 is 40 degree.
The utility model is not limited to above-mentioned embodiment, and heating plate and conducting strip can adopt one group, two groups, three groups or many groups, decide on concrete applicable cases.Should be understood that, every in any simple deformation of making on the utility model claim 1 technical scheme basis all within the utility model intention protection domain.
Claims (2)
1. a palmmprint instrument demister system is characterized in that comprising heating plate, conducting strip, electron temperature detect switch, power supply; On the face of described conducting strip attached to the obstructed light of prism, heating plate is fixed on the conducting strip; Electron temperature detect switch is fixed on the position of adjacent prisms upper surface, and is communicated with power supply and heating plate by electron temperature detect switch.
2. palmmprint instrument demister system according to claim 1 is characterized in that described heating plate adopts the PTC thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206623944U CN201917923U (en) | 2010-12-16 | 2010-12-16 | Palm print instrument defogging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206623944U CN201917923U (en) | 2010-12-16 | 2010-12-16 | Palm print instrument defogging system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201917923U true CN201917923U (en) | 2011-08-03 |
Family
ID=44417716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206623944U Expired - Fee Related CN201917923U (en) | 2010-12-16 | 2010-12-16 | Palm print instrument defogging system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201917923U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102385699A (en) * | 2011-11-01 | 2012-03-21 | 长春方圆光电技术有限责任公司 | System for acquiring palmprint in dark background |
| CN102913884A (en) * | 2012-10-23 | 2013-02-06 | 广州市浩洋电子有限公司 | Defogging system for stage lamp lenses |
| CN107918982A (en) * | 2017-12-13 | 2018-04-17 | 北京智联弘盛科技发展有限公司 | Intelligent cash sales counter |
| CN112113550A (en) * | 2020-10-16 | 2020-12-22 | 中铁上海设计院集团有限公司 | Intelligent magnetic suspension power multi-state measuring prism and application method thereof |
-
2010
- 2010-12-16 CN CN2010206623944U patent/CN201917923U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102385699A (en) * | 2011-11-01 | 2012-03-21 | 长春方圆光电技术有限责任公司 | System for acquiring palmprint in dark background |
| CN102913884A (en) * | 2012-10-23 | 2013-02-06 | 广州市浩洋电子有限公司 | Defogging system for stage lamp lenses |
| CN102913884B (en) * | 2012-10-23 | 2014-12-10 | 广州市浩洋电子有限公司 | Defogging system for stage lamp lenses |
| CN107918982A (en) * | 2017-12-13 | 2018-04-17 | 北京智联弘盛科技发展有限公司 | Intelligent cash sales counter |
| CN112113550A (en) * | 2020-10-16 | 2020-12-22 | 中铁上海设计院集团有限公司 | Intelligent magnetic suspension power multi-state measuring prism and application method thereof |
| CN112113550B (en) * | 2020-10-16 | 2023-08-15 | 中铁上海设计院集团有限公司 | Intelligent magnetic floating force polymorphism measuring prism and application method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110803 Termination date: 20171216 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |