CN2397516Y - Camera fully automatic light-adjusting and focusing system controlled by one-chip computer - Google Patents
Camera fully automatic light-adjusting and focusing system controlled by one-chip computer Download PDFInfo
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- CN2397516Y CN2397516Y CN 99247984 CN99247984U CN2397516Y CN 2397516 Y CN2397516 Y CN 2397516Y CN 99247984 CN99247984 CN 99247984 CN 99247984 U CN99247984 U CN 99247984U CN 2397516 Y CN2397516 Y CN 2397516Y
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Abstract
The utility model relates to an improvement for photography light adjusting and focusing systems, comprising a density disc, an image surface and an opening angle detecting device, a liquid crystal screen, a monolithic computer, a memory, an interface, a key managing device, a driving module, a mechanical driving device, a stepping motor, a focusing detecting device, a light wedge, a power supply, a photography pulse receiving device, an automatic focusing receiving device, a shutter and a phase reversal. The utility model realizes the automatic adjustment of positions of the density disc and the moving light wedge by one monolithic computer, can automatically adjust the opening angle of the shutter and directly control the amount of exposure and the resolution on photographic negatives without ultraharmonic shock. The range of the automatic adjustment of the automatic light adjustment is enhanced 16 times, and the utility model especially suitable for devices working under strong light.
Description
The invention belongs to optical technical field, relate to a kind of improvement the photography light modulation focusing system.
The K400 cinetheodollite that several model cinetheodollites that prior art is used and Switzerland produce all has photography light modulation, focusing system, and the photography light adjusting system comprises: testing circuit, modulator and frequency-selecting amplifier, shift to device and voltage amplifier, limit circuit, phase inverter and power amplifier, motor, gear case, variable-density disk, manual shutter.
The structure of focusing system also comprises the distance signal testing circuit except that the parts identical with above-mentioned light adjusting circuit, controlled object wedge of focusing.Photography light modulation and focusing system are realized the control of two systems by circuit board separately.
1, existing light adjusting system
The light modulation testing circuit of prior art adopts null-type bridge circuit, and an arm of electric bridge has been adorned a photoresistance R, with the detecting element of photoresistance as light adjusting system, is used for measuring illuminance of image plane.In order to adapt to various photography conditions, just need on another arm of electric bridge, to connect the resistance R 3 that several differences concern arrangement by a certain percentage, when changing the R3 resistance of electric bridge, the electric bridge out of trim, the output of one dc error signal is arranged, mechanical chopper in modulator and frequency-selecting amplification is modulated into square-wave voltage, deliver to the input end of phase shifter and voltage amplifier, phase shifter and voltage amplifier are imported phase inverter and power amplifier drive motor again after with signal phase shift and voltage amplification, after gear case slows down, drive variable-density disk and realize light modulation.It can compensate the variation range of exposure automatically and have only 25 of variable-density disk variation range, increase the then moving angular aperture of opening greatly or opening little shutter of armrest of variation range.
2, existing focusing system
The focusing system of prior art is except that having the distance signal testing circuit, and other circuit are the same with light adjusting system, and different is by motor after gear case slows down, and drives wedge and moves.
The objective of the invention is to overcome the shortcoming that prior art exists, solve following problems:
A) adopt photoresistance low as the opto-electronic conversion precision that measuring sensor brings, dynamic perfromance is poor, is subject to the problem of bad border temperature effect.
B) the circuit complexity that circuit employing discrete component brings in the prior art, method of adjustment trouble, unstable link reach with alternating current generator more drives neutral variable-density disk rotation and the system overshoot and the reforming phenomena of appearance.
C) because the angular aperture of shutter will be regulated size by operating personnel.Each photography will be looked into exposure alignment table, sets luminosity coefficient with the empty background illuminance of illuminometer observation, thereby makes system operation complexity, factors such as instability.
The variation of exposure scope that d) can compensate automatically is 32 times, make that the narrow precision of the automatic setting range of light modulation is low, can not satisfy of the requirement of Modern High-Speed camera chain, the range of the photographic frequency of modern photography control system from low speed 1C/S to high speed 240C/S to light adjusting system.The dimming scope of its requirement photography light adjusting system adapts to the variation of the photographic frequency of photographic control system.
E) photography light adjusting system and focusing system are realized control, poor reliability, consuming cost height by two circuit boards.
F) can not carry out automatic focusing.
Light modulation focusing detailed content of the present invention comprises: variable-density disk 1, image planes testing circuit 2, angular aperture testing circuit 3, LCDs 4,16 single-chip microcomputers 5,2764 type program storages 6, interface circuit 7, limit circuit 8, button management circuit 9, stepper power driver module 10, mechanical drive 11, stepper motor 12, stepper power driver module 13, mechanical drive 14, stepper motor 15, distance focusing testing circuit 16, stepper power driver module 17, mechanical drive 18, stepper motor 19, wedge 20, Switching Power Supply 21, photography pulse receiving circuit 22, automatic focusing signal receiving circuit 23, shutter 24, wiring board 25, casing 26, control panel 27, phase inverter 28, side at variable-density disk 1 is settled illuminance of image plane testing circuit 2, the output terminal of illuminance of image plane testing circuit 2, the output terminal of shutter opening angle testing circuit 3 is received the analog to digital conversion passage ACH1 of 16 single-chip microcomputers 5 and the input end of ACH3 respectively, the output terminal of distance focusing testing circuit 16 is received 16 single-chip microcomputers, 5 analog to digital conversion passage ACH6 input ends, 16 single-chip microcomputer 5 data buss and 2764 type program storages 6, interface circuit 7, LCDs 4, the data bus of button management circuit 9 joins, the high-speed output hso .0 of 16 single-chip microcomputers 5, HSO.1, HSO.2 connects the input end of phase inverter 28 respectively, the output terminal of phase inverter 28 and stepper power driver module 10, stepper power driver module 13, the CP end of stepper power driver module 17 joins, stepper power driver module 10, stepper power driver module 13, the output terminal of stepper power driver module 17 respectively with stepper motor 12, stepper motor 15, the winding of stepper motor 19 joins, stepper motor 12,15 and 19 the axle respectively with mechanical drive 11,14 link to each other with 18, mechanical drive 11,14 and 18 the other end respectively with variable-density disk 1, shutter 24, wedge 20 joins, the other end of shutter 24 links to each other with shutter opening angle testing circuit 3, the P2.6 of the output terminal of limit circuit 8 and 16 single-chip microcomputers 5, P2.7 joins, the output terminal of photography pulse receiving circuit 22 is received the input end of the hsi port HSI.0 of 16 single-chip microcomputers 5, the input end of automatic focusing distance signal receiving circuit 23 is connected with external communication interface, and the output terminal of automatic focusing distance signal receiving circuit 23 and the serial port RXD of 16 single-chip microcomputers 5 join.According to the numerical value of the output of automatic focusing distance signal receiving circuit 23, calculate target to the distance the system of the present invention and be transformed into decimal code by 16 single-chip microcomputers 5 and 2764 type program storages 6, intuitively show by LCDs 4.On wiring board 25, place image planes testing circuit 2,3,16 single-chip microcomputer 5,2764 type program storages 6 of angular aperture testing circuit, interface circuit 7, limit circuit 8, button management circuit 9, distance focusing testing circuit 16, photography pulse receiving circuit 22, automatic focusing distance signal receiving circuit 23, phase inverter 28, place wiring board 25, stepper power driver module 10,13,17 and Switching Power Supply 21 in the casing 26, Switching Power Supply 21 is power supplies of system of the present invention, and the switch of LCDs 4 and Switching Power Supply 21 is placed on the control panel 27.
The course of work of light modulation focusing system of the present invention is:
1, automatic light control system:
When the sky bias light enters in the transit telephotolens light path, the illuminance of image plane testing circuit 2 that shines phototriode and operational amplifier composition through variable-density disk 1 carries out opto-electronic conversion, converting bias light to be directly proportional with bias light DC voltage amount is the illuminance of image plane value, the testing circuit 3 of angular aperture is exported another DC voltage, is input to input end ACH1, the ACH3 of the analog to digital conversion passage of 16 single-chip microcomputers 5 respectively.16 single-chip microcomputers 5 and 2764 type program storages 6 send and deposit internal storage region in after two analog quantitys that instruction will import convert digital quantity to.The standard exposure amount presets in single-chip microcomputer 5 internal memories and the corresponding numerical value of standard exposure amount (film sensitivity).The standard exposure amount is selected by the options button of button management circuit 9, press definite key after selecting, differentiate by program inquiring, and by LCDs 4 with the numerical value of the angle value of the Chinese character-shaped demonstration angular aperture directly perceived of 16*16, light sensitivity with by the photographic frequency of Automatic Program frequency discrimination.The photography pulse of outside time-code terminal output is input to the input end of photography pulse receiving circuit 22, the output terminal of photography pulse receiving circuit 22 is received the input end of the hsi port HSI.0 of 16 single-chip microcomputers 5, identify photographic frequency by Automatic Program, 16 illuminance of image plane values that single-chip microcomputer 5 detects illuminance of image plane testing circuit 2, the time shutter that the angular aperture value of the internal memory that is read in by ACH3 and photographic frequency are determined is calculated by 16 single-chip microcomputers 5, calculate the sampling exposure, the sampling exposure draws exposure error with presetting with the corresponding numeric ratio of standard exposure amount of 16 single-chip microcomputer 5 internal memories again, the pulse signal that 16 single-chip microcomputers 5 produce frequency adjustable according to this error by the high-speed output hso .0 HSO.1 and the 2764 type program storages 6 of 16 single-chip microcomputers 5.The input end of this received impulse signal phase inverter 28, receive the CP end of stepper power driver module 10 and stepper power driver module 13 by the output terminal of phase inverter 28, when exposure error is not equal to zero, send instruction by 2764 type program storages 6, by program at first control step motor 12 drive variable-density disks 1 and rotate to reducing direction of error, still can not to make error be zero if variable-density disk 1 forwards the mechanical position limitation position to, then 16 single-chip microcomputers 5 send programmed instruction again, regulate the angular aperture of shutter immediately, also drive simultaneously the pot of angular aperture testing circuit 3, continuation is rotated to reducing direction of error, up to error convergence zero, system balancing, stepper motor stops.If the P2.6 of 16 single-chip microcomputers 5, P2.7 detect the machinery of limit circuit 8 spacing state is arranged.Then by a little less than LCDs 4 Chinese characters demonstration light intensity or the light.Ambient light constantly changes, and light modulation is also constantly carried out.
2, automatic focusing system
Distance focusing testing circuit 16 reads in 16 single-chip microcomputers 5 through the analog to digital conversion passage ACH6 of 16 single-chip microcomputers 5.16 single-chip microcomputers 5 and 2764 type program storages 6 send and compare with the numerical value (reference voltage) that is preset at 16 single-chip microcomputer internal memories after instruction converts the analog quantity of input to digital quantity, draw error △ U, if error is not equal to zero, the pulse signal that 16 single-chip microcomputers 5 produce frequency adjustable according to this error by the high-speed output hso .2 and the 2764 type procedure stores 6 of 16 single-chip microcomputers 5.The input end of this received impulse signal phase inverter 28, the CP that is received stepper power driver module 17 by the output terminal of phase inverter 28 holds, and drives wedges 20 by programmed control stepper motor 19 and rotates to the direction that reduces error, up to error convergence zero, system balancing, stepper motor 19 stops.Distance focusing testing circuit 16 detected distance signals are after the analog to digital conversion passage ACH6 of 16 single-chip microcomputers 5 reads in 16 single-chip microcomputer 5 internal storage regions, at first convert thereof into decimal code and deliver on the LCDs 4 with the font of 24*16 in 16 single-chip microcomputers 5, display-object directly perceived is to the distance of instrument.
When the ACH6 of 16 single-chip microcomputers 5 does not detect the distance signal of distance focusing testing circuit 16 outputs.16 single-chip microcomputers 5 are inquired about serial port RXD immediately, because of automatic focusing distance signal receiving circuit 23 provides guidance information by microcomputer communication, adopt RS232 to isolate, serial port RXD input by 16 single- chip microcomputers 5,16 single-chip microcomputers 5 are according to the numerical value of importing, calculate distance and be transformed into decimal code, intuitively show by LCDs.
Good effect of the present invention;
Light modulation focusing system of the present invention is promptly automatically adjusted the position of variable-density disk 1 and the size of regulating shutter opening angle automatically, and the position of automatic mobile wedge again is so be referred to as the full-automatic light regulator focusing system.
A) light adjusting system is because the illuminance of image plane testing circuit has adopted phototriode to do detecting element, what it directly received is sky background light, can directly control the exposure on the film, remove the method that optical measuring device is looked into exposure alignment table conversion luminosity coefficient, make operation easier.Solved light modulation complicated operation in the past, problem easily influenced by ambient temperature.
B) because the present invention adopts integrated circuit, with 16 80C196KB single-chip microcomputers of a top grade is the control core, realized the dual control mode not only controlling light adjusting system automatically but also control focusing system automatically with a circuit board, this control mode has improved the automaticity of system's control, strengthened system control function, minimizing has also been simplified system hardware structure, has reduced cost, and has made the control system microminiaturization.
C) owing to adopted stepper motor as executive component, therefore can accurately control the amount of spin of motor, make control system not produce the hyperharmonic concussion, the system that has obviously improved light modulation and focusing adjusts precision and control accuracy, has strengthened the stability and the reliability of system's control.
D) prior art adopts the variable-density disk light modulation to adjust 32 times only automatically, the present invention is owing to adopt the structure of the angular aperture of regulating shutter, the angular aperture of shutter is changed in 7.5 °～120 ° scope continuously, be that automatic setting range with an automatic light meter has improved 16 times again, the variation of exposure scope that then can compensate automatically is 512 times.Wide like this setting range has satisfied the requirement of modern photography control system to focusing range with an automatic light meter fully.
E) owing to adopted LCDs to show the adjustment distance of focusing, show the angle value of the angular aperture of light modulation, the numerical value and the photography pulse of light sensitivity with Chinese character.Make the control of light modulation and focusing system more perfect, show with LCDs to be better than charactron.Because LCDs is not subjected to the restriction of the high light and the low light level, be particularly suitable for the equipment of work under the open-air high light.
F) the adjustment precision of the present invention's focusing with an automatic light meter is weighed with the variable quantity of egative film density value, and the density value error of actual measurement task mediella is less than 10%, and target is clear.The complete machine energized, light modulation and focusing can be adjusted automatically, are the focusing systems with an automatic light meter of total digitalization.
Description of drawings:
Fig. 1 is the prior art theory diagram
Fig. 2 is the null-type bridge circuit figure in the prior art testing circuit
Fig. 3 is a structural representation of the present invention
Fig. 4 is a principle of the invention block diagram
Fig. 5 is the present invention's focusing control program with an automatic light meter process flow diagram
Embodiments of the invention:
Variable-density disk 1 selects for use optical glass coating to make, and transmitted light changes with corner.Illuminance of image plane testing circuit 2 is made up of a phototriode and two LM3140 operational amplifiers.Shutter 24 is two blades of a machining moulding.The WX74A-1 type pot that angular aperture testing circuit 3 selects for use semiconductor 14 factories in Shanghai to produce, resistance 10K ± 0.5%.Band bias light and wide temperature range type that LCDs 4 selects for use paulin science and trade far away company of Beijing Tsing-Hua University to provide, model MGLS12864T (built-in T6963C controller dot matrix graphic).16 single-chip microcomputers 5 select for use INTEL to produce, high-grade 16 single-chip microcomputers of model: 80C196KB.2764 models that program storage selects for use American I NTEL company to produce.Interface circuit 7 selects for use the 74HC573 model to form.It is that WWK-2 and 5.1K resistance are formed that limit circuit 8 is selected the microswitch model for use.Button management circuit 9 is by 74HC245, and 74HC00 forms.Three power driver modules of stepper, 10,13,17 usefulness Beijing industrial and trading company production models are μ P-3BF04.Three 45BF005 model stepper motors that stepper motor 12,15,19 adopts Changzhou telecommunication electrical machinery plant to produce.Mechanical drive 11,14,18 is made up of gear and shaft coupling, adopts this institute product.The WX74A-1 type pot that distance focusing testing circuit 16 adopts Shanghai semiconductor 14 factories to produce, resistance 39K ± 0.5% and operational amplifier model 3140 are formed.Wedge 20 is optical glass products that I produce.Photography pulse receiving circuit 22 adopts model 4N25 to form.It is MAX202E that automatic focusing distance signal receiving circuit 23 adopts model, and Huanghua, wiring board 25 effluents north hemp is bought circuit board plant production.Switching Power Supply 21 employing ± 12V ,+5V, the product of+24V Chaoyang power supply factory.Casing 26 and control panel 27 self-controls.Phase inverter 28 is made up of 74HC14.Mechanical drive 11, stepper motor 12,, mechanical drive 14, stepper motor 15, mechanical drive 18, stepper motor 19, wedge 20, shutter 24 link to each other with the exterior mechanical system.
Claims (1)
1, a kind of monolithic processor controlled photography full-automatic light regulator focusing system, comprise: variable-density disk 1, image planes testing circuit 2, angular aperture testing circuit 3, limit circuit 8, mechanical drive 11,14 and 18, stepper motor 12,15 and 19, Switching Power Supply 21, shutter 24, wiring board 25, casing 26, control panel 27, phase inverter 28, it is characterized in that: illuminance of image plane testing circuit 2, the output terminal of shutter opening angle testing circuit 3 is received the analog to digital conversion passage ACH1 of 16 single-chip microcomputers 5 and the input end of ACH3 respectively, the output terminal of distance focusing testing circuit 16 is received 16 single-chip microcomputers, 5 analog to digital conversion passage ACH6 input ends, 16 single-chip microcomputer 5 data buss and 2764 type program storages 6, interface circuit 7, LCDs 4, the data bus of button management circuit 9 joins, the high-speed output hso .0 of 16 single-chip microcomputers 5, HSO.1, HSO.2 is respectively through phase inverter 28 and stepper power driver module 10, stepper power driver module 13, the CP end of stepper power driver module 17 joins, stepper power driver module 10, stepper power driver module 13, the output terminal of stepper power driver module 17 respectively with stepper motor 12, stepper motor 15, the winding of stepper motor 19 joins, the axle of stepper motor 19 links to each other with mechanical drive 18, mechanical drive 18 other ends and wedge 20 join, the P2.6 of the output terminal of limit circuit 8 and 16 single-chip microcomputers 5, P2.7 joins, the output terminal of photography pulse receiving circuit 22 is received the input end of the hsi port HSI.0 of 16 single-chip microcomputers 5, the input end of automatic focusing distance signal receiving circuit 23 is connected with external communication interface, and the output terminal of automatic focusing distance signal receiving circuit 23 and the serial port RXD of 16 single-chip microcomputers 5 join.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99247984 CN2397516Y (en) | 1999-12-01 | 1999-12-01 | Camera fully automatic light-adjusting and focusing system controlled by one-chip computer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99247984 CN2397516Y (en) | 1999-12-01 | 1999-12-01 | Camera fully automatic light-adjusting and focusing system controlled by one-chip computer |
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| Publication Number | Publication Date |
|---|---|
| CN2397516Y true CN2397516Y (en) | 2000-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 99247984 Expired - Fee Related CN2397516Y (en) | 1999-12-01 | 1999-12-01 | Camera fully automatic light-adjusting and focusing system controlled by one-chip computer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100389363C (en) * | 2003-12-09 | 2008-05-21 | 北京中星微电子有限公司 | Exposure pulse generator, exposure generating device and exposure pulse output method |
| CN100511073C (en) * | 2007-10-11 | 2009-07-08 | 中国科学院长春光学精密机械与物理研究所 | Density disc drive device of automatic light modulation system |
| CN102435219A (en) * | 2011-08-02 | 2012-05-02 | 中国科学院长春光学精密机械与物理研究所 | Aerospace camera focusing encoder debugging, measurement and control system |
| CN107462985A (en) * | 2017-09-21 | 2017-12-12 | 中国科学院长春光学精密机械与物理研究所 | The networking type light modulation focusing system and control method of large telescope multiple imaging system |
| CN111510633A (en) * | 2020-04-30 | 2020-08-07 | 中国科学院长春光学精密机械与物理研究所 | Serial bus communication system and communication method |
-
1999
- 1999-12-01 CN CN 99247984 patent/CN2397516Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100389363C (en) * | 2003-12-09 | 2008-05-21 | 北京中星微电子有限公司 | Exposure pulse generator, exposure generating device and exposure pulse output method |
| CN100511073C (en) * | 2007-10-11 | 2009-07-08 | 中国科学院长春光学精密机械与物理研究所 | Density disc drive device of automatic light modulation system |
| CN102435219A (en) * | 2011-08-02 | 2012-05-02 | 中国科学院长春光学精密机械与物理研究所 | Aerospace camera focusing encoder debugging, measurement and control system |
| CN107462985A (en) * | 2017-09-21 | 2017-12-12 | 中国科学院长春光学精密机械与物理研究所 | The networking type light modulation focusing system and control method of large telescope multiple imaging system |
| CN111510633A (en) * | 2020-04-30 | 2020-08-07 | 中国科学院长春光学精密机械与物理研究所 | Serial bus communication system and communication method |
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| CF01 | Termination of patent right due to non-payment of annual fee |