CN204903934U - Projecting apparatus that can adjust luminance based on operational amplifier circuit - Google Patents
Projecting apparatus that can adjust luminance based on operational amplifier circuit Download PDFInfo
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- CN204903934U CN204903934U CN201520430469.9U CN201520430469U CN204903934U CN 204903934 U CN204903934 U CN 204903934U CN 201520430469 U CN201520430469 U CN 201520430469U CN 204903934 U CN204903934 U CN 204903934U
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Abstract
The utility model discloses a projecting apparatus that can adjust luminance based on operational amplifier circuit contains light sense sensor, microcontroller module, operational amplifier circuit, analog -to -digital conversion module and control module, the output of light sense sensor passes through the input that analog -to -digital conversion module connects the microcontroller module, microcontroller's output passes through operational amplifier circuit connection control module, operational amplifier circuit contains amplifier chip, first resistance, second resistance, third resistance, the one end of first resistance and second resistance is connected respectively to the output of microcontroller module, and the positive pole of amplifier chip is connected to the other end of second resistance, with the other end ground connection of first resistance behind the negative pole of amplifier chip and the 3rd series resistance, and the voltage output end connection control module's of amplifier chip input.
Description
Technical field
The utility model relates to a kind of projector, particularly relates to a kind of projector of the tunable optical based on operational amplification circuit, belongs to regulation and control field.
Background technology
From the development in industry future, education is still industry future development pillar field.According to prediction net statistical figure, institute of total kindergarten 12.91 ten thousand, the whole nation in 2010, institute of primary school 39.42 ten thousand, general high school 7.90 ten thousand institute, institute of common medium universities and colleges 3047, institute of higher education school 1778, be equipped with a projector by each classroom to calculate, according to related data display China only education sector market capacity just reach more than 1,100 ten thousand, if calculated according to projection occupation rate, projector can account for about 14%-28% (not comprising market maintenance), and the real sales volume of education market in 2010 is less than 500,000.
Secondly, the development in commercial projection market is also the key strength of left and right projector market development.Although China's commercial affairs projection market, in rapid expansion, is estimated according to relevant survey institute, in future, medium-sized and small enterprises quantity will keep the rate of growth of 7%-8%, and within 2012, medium-sized and small enterprises sum will reach 5,000 ten thousand, industry development Bright Prospect.In addition, with regard to domestic at present, wealthy family's quantity of assets more than 1,000,000 can reach more than 200 ten thousand, and some elite, white collar are comparatively large for the demand of the quality of life, amusement equipment, and following household application market has a high potential.
The development of Science in Future in China projector industry, also rely on the support of government policy, in " the 12 " program outline announced, Cultural Information Resources Sharing Project is put into " system of public cultural services construction project ", and this will advance the development of Chinese projector industry in the coming years.In addition, in " 12 " planning, the system of public cultural services construction projects such as radio and television Rural areas, project to screen movies in rural areas also will obtain continuing to advance, and the IT buying of local government is by one of main growth factor becoming whole IT market.More than comprehensive, Science in Future in China projector industry development prospect is huge.
At present, in the routine use of projector, ambient light and projection screen all can have an impact to drop shadow effect.Under bright or dark varying environment, drop shadow effect is also different, and projection screen is if not white in addition, and the color of projection will be affected.Existing projector can only be manual the brightness of adjustment projector, the color parameter such as the redgreenblue ratio of manual adjustment projector, do not possess the function automatically regulated.
A kind of projector of such as " 200980158326.4 ", it uses LASER Light Source and is safe, and realizes high brightness.The laser beam of launching from LASER Light Source is applied to image modulation device by this projector, and is projected by the Nonlinear magnify be formed in image modulation device by zoom lens.This projector comprises control gear, its change for the focal length in response to zoom lens and control the amount of the energy of light beam by this way, that is, the energy density of the laser beam occurred on the light emission surface of zoom lens is made to remain on setting or be less than setting.This setting is the energy density of the laser beam when being most short value by the focus settings of zoom lens, and is the accessible emission limit value of the laser safety grade meeting projector.
And for example a kind of projector LED light source structure of " 201310205346.0 ", comprise: light source base and the multiple small light sources be located on light source base four perisporium, each small light source is provided with condenser, in the base central authorities of light source base, a mirror assembly is set, a Light-modulating mirror erecting frame is provided with between mirror assembly and multiple small light source, and on Light-modulating mirror erecting frame, the Light-modulating mirror corresponding with each small light source is installed respectively, these Light-modulating mirrors are located at the front of each small light source, wherein, the light that small light source sends converts directional light to and sends after condenser process, by light beam being concentrated into after described Light-modulating mirror process a branch of light pencil directive mirror assembly, described multiple light pencil reflects away by described mirror assembly.The light pencil that the utility model can concentrate a lot of brightness very strong, all light pencils send along same direction, form the light source that a brightness is very high, and eliminate complicated cooling system.
Utility model content
Technical problem to be solved in the utility model is the projector providing a kind of tunable optical based on operational amplification circuit for the deficiency of background technology, and its structure is simple, and the image light intensity that projector can be made to launch and environmental light intensity ratio keep the best.
The utility model is for solving the problems of the technologies described above by the following technical solutions:
Based on a projector for the tunable optical of operational amplification circuit, comprise photosensitive sensors, micro controller module, operation amplifier circuit, analog-to-digital conversion module and regulation and control module; The output terminal of described photosensitive sensors connects the input end of micro controller module by analog-to-digital conversion module, the output terminal of described microcontroller connects regulation and control module by operation amplifier circuit; Described operational amplification circuit comprises amplifier chip, the first resistance, the second resistance, the 3rd resistance; The output terminal of micro controller module connects one end of the first resistance and the second resistance respectively, the other end of the second resistance connects the positive pole of amplifier chip, with the other end ground connection of the first resistance after the negative pole of amplifier chip and the 3rd resistant series, the voltage output end of amplifier chip connects the input end of regulation and control module.
As the further preferred version of the projector of a kind of tunable optical based on operational amplification circuit of the utility model, described photosensitive sensors adopts photoresistance.
As the further preferred version of the projector of a kind of tunable optical based on operational amplification circuit of the utility model, described micro controller module adopts AVR series monolithic.
As the further preferred version of the projector of a kind of tunable optical based on operational amplification circuit of the utility model, the chip model of described analog-to-digital conversion module is TMS320LF240.
As the further preferred version of the projector of a kind of tunable optical based on operational amplification circuit of the utility model, described micro controller module adopts storage battery power supply.
The utility model adopts above technical scheme compared with prior art, has following technique effect:
1, the utility model structure simple, be easy to realize;
2, the utility model utilizes photoelectric sensor dynamic acquisition environmental light intensity, and process reaches object with an automatic light meter by analysis.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present utility model;
Fig. 2 is operation amplifier circuit of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail:
As shown in Figure 1, a kind of projector of the tunable optical based on operational amplification circuit, comprises photosensitive sensors, micro controller module, operation amplifier circuit, analog-to-digital conversion module and regulation and control module; The output terminal of described photosensitive sensors connects the input end of micro controller module by analog-to-digital conversion module, the output terminal of described microcontroller connects regulation and control module by operation amplifier circuit; Described operational amplification circuit comprises amplifier chip, the first resistance, the second resistance, the 3rd resistance; The output terminal of micro controller module connects one end of the first resistance and the second resistance respectively, the other end of the second resistance connects the positive pole of amplifier chip, with the other end ground connection of the first resistance after the negative pole of amplifier chip and the 3rd resistant series, the voltage output end of amplifier chip connects the input end of regulation and control module.
Wherein, described photosensitive sensors adopts photoresistance, and described micro controller module adopts AVR series monolithic.The chip model of described analog-to-digital conversion module is TMS320LF240.Described micro controller module adopts storage battery power supply.
Photosensitive sensors produces the voltage of O ~ 412mV under the illumination of 0 ~ 50000lux scope, and the A/D input voltage range of single-chip microcomputer is O ~ 3.3V, and therefore system adopts LM324 to carry out amplification conditioning to signal.Realize the scope of the voltage amplification of 0 ~ 412mV to O ~ 3.3V, Design enlargement multiple is 8, and enlargement factor is determined: be specifically calculated as follows: Av=1+R24/R23.Determine that R23 selects 10k Ω resistance, R24 selects 80k Ω resistance.LM324 by four independently amplifier form, gathering the accuracy of light intensity to improve, gathering CCFL light intensity with two photoelectric sensings respectively, two collection environmental light intensities.
AVR single chip has prefetched instruction function, namely when an execution instruction, in advance next instruction is got into, and call instruction can be performed within a clock period; Multiple accumulator type, data processing speed is fast; AVR single chip has 32 general purpose working registers, and being equivalent to has 32 viaducts, can fast passing; Response time is fast.AVR single chip has multiple fixing interrupt vector entry address, can respond interruption fast; AVR single chip power consumption is low.For typical power consumption situation, be 100nA when WDT closes, be more suitable for battery powered application apparatus; The minimum 1.8V of some devices gets final product work; AVR single chip security performance is good.
The utility model adopts operational amplification circuit, and as shown in Figure 2, described operational amplification circuit comprises amplifier chip, the first resistance, the second resistance, the 3rd resistance; Voltage input end connects one end of the first resistance and the second resistance respectively, the other end of the second resistance connects the positive pole of amplifier chip, with the other end ground connection of the first resistance after the negative pole of amplifier chip and the 3rd resistant series, the voltage output end of amplifier chip connects regulation and control module; Photoelectric sensor Real-time Collection environmental light intensity is to micro controller module, and micro-control module carries out analog to digital conversion to signal, exports control voltage, realize the automatic adjustment of projector brightness according to after computing through operational amplification circuit; Described micro-control module connects host computer by communication unit, for seeing the setting of sheet instrument parameter.
The utility model is by photosensitive sensors Real-time Collection ambient light intensity, the optical parameter gathered is carried out to analog to digital conversion and then transferred to micro controller module, micro controller module carries out Data Analysis Services to acquisition parameter, then carries out the light output of method process by regulation and control module control projector by exporting control signal; The signal processing method that the utility model relates to all is known to the skilled person general knowledge.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the utility model.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Above embodiment is only and technological thought of the present utility model is described; protection domain of the present utility model can not be limited with this; every technological thought according to the utility model proposes, any change that technical scheme basis is done, all falls within the utility model protection domain.By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, make a variety of changes under can also or else departing from the prerequisite of the utility model aim.
Claims (5)
1. based on a projector for the tunable optical of operational amplification circuit, it is characterized in that: comprise photosensitive sensors, micro controller module, operation amplifier circuit, analog-to-digital conversion module and regulation and control module; The output terminal of described photosensitive sensors connects the input end of micro controller module by analog-to-digital conversion module, the output terminal of described microcontroller connects regulation and control module by operation amplifier circuit; Described operational amplification circuit comprises amplifier chip, the first resistance, the second resistance, the 3rd resistance; The output terminal of micro controller module connects one end of the first resistance and the second resistance respectively, the other end of the second resistance connects the positive pole of amplifier chip, with the other end ground connection of the first resistance after the negative pole of amplifier chip and the 3rd resistant series, the voltage output end of amplifier chip connects the input end of regulation and control module.
2. the projector of a kind of tunable optical based on operational amplification circuit according to claim 1, is characterized in that: described photosensitive sensors adopts photoresistance.
3. the projector of a kind of tunable optical based on operational amplification circuit according to claim 1, is characterized in that: described micro controller module adopts AVR series monolithic.
4. the projector of a kind of tunable optical based on operational amplification circuit according to claim 1, is characterized in that: the chip model of described analog-to-digital conversion module is TMS320LF240.
5. the projector of a kind of tunable optical based on operational amplification circuit according to claim 1, is characterized in that: described micro controller module adopts storage battery power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520430469.9U CN204903934U (en) | 2015-06-23 | 2015-06-23 | Projecting apparatus that can adjust luminance based on operational amplifier circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520430469.9U CN204903934U (en) | 2015-06-23 | 2015-06-23 | Projecting apparatus that can adjust luminance based on operational amplifier circuit |
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| CN204903934U true CN204903934U (en) | 2015-12-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231277A (en) * | 2016-08-28 | 2016-12-14 | 天津通信广播集团有限公司 | Laser television ray machine control system based on AML7366SOC chip |
| CN106357004A (en) * | 2016-11-01 | 2017-01-25 | 南京软核科技有限公司 | Distributed feeder line automatic monitoring device for rural power distribution network |
-
2015
- 2015-06-23 CN CN201520430469.9U patent/CN204903934U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231277A (en) * | 2016-08-28 | 2016-12-14 | 天津通信广播集团有限公司 | Laser television ray machine control system based on AML7366SOC chip |
| CN106357004A (en) * | 2016-11-01 | 2017-01-25 | 南京软核科技有限公司 | Distributed feeder line automatic monitoring device for rural power distribution network |
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