CN1847863A - Automatic test instrument for function of photography flash - Google Patents

Abstract

The test instrument specially for functional parameters of automatic flash lamp consists of two parts, one test fixture and one test controller. It can measure flash time, flash setup time, lamp tube operation voltage and other key parameters, and the measured items may be increased or decreased. The whole test process is completed by means of the test program in the microprocessor, and the test results and relevant information are shown in the LCD. The instrument has high work efficiency, simple operation, easy maintenance and other advantages and is ideal instrument for industrial production.

Description

Automatic test instrument for function of photography flash

Affiliated technical field:

The present invention relates to a kind of full self-test device to function of photography flash, it is applicable to the on-line testing of camera circuit plate manufacturing enterprise very much.

Background technology:

At present, in the manufacturing enterprise of camera circuit plate, general online the flash lamp circuit plate is adopted some comparatively simple manual test equipment, often can only its flash function of qualitative detection, and the key parameter test to be system test with camera carry out, so just can not in manufacture process, in time pinpoint the problems, make Quality Feedback become slow, reprocess length not only consuming time, and damage miscellaneous part easily, manufacturing cost rises.

Summary of the invention:

People take when running under illumination deficiency or the environment at complete unglazed photograph when the photography activity, just need assist to finish shooting with artificial light, to obtain more satisfactory shooting effect.Flashlamp is present the most frequently used shooting artificial light source.Along with the robotization of camera improves constantly, the intellectual flashlamp that modern digital camera and high-grade camera are automatically used just is different from the flashlamp that traditional mechanical formula camera is in the past used.It can regulate the intensity of illumination (flash time length) of flashlamp automatically along with the illumination condition of subject and environment, to reach best shooting effect.In addition, for reaching stable light index and convenient the shooting, the operating voltage of lamp tube ends and the setup time of glistening also must be controlled.Therefore, accurate these functions of test on production line just seem extremely important to quality and the shooting effect that guarantees camera, and automatic test instrument for function of photography flash just manufactures and designs for every functional parameter of special detection automatic flash light.

The flashlamp function of this tester automatically testing digital camera comprises: glisten setup time parameters such as flash time length and lamp works voltage.It can be used to the manufacturing enterprise of digital camera and traditional camera and the recycling production line of disposable camera.As the Function detection equipment of flashlamp, it has simple in structure, and running software is stable, and test is reliable, simple operation and other advantages, its alternative some simplified manual at present, no quantitative checkout equipment, perhaps unusual expensive detection equipment.It can realize the key parameter that full automatic quantitative test is whole, improves test accuracy and efficient, is suitable for the testing station that streamline in enormous quantities is produced.

The technical scheme that this tester adopted is the synchronous base time of utilizing crystal oscillator to produce to control and measure flash of light setup time and flash time length, the length of the trigger pulse control flash time that generation time is variable.The voltage signal of detected operating voltage signal and photosensitive device output is carried out mould/number conversion, the input of the digital signal after conversion machine inner microprocessor is carried out computing differentiate, and on LCD, show test event and data and test result.In case test result overshoot value or state, tester can be parked in this test event automatically, shows defective content and warning, and all testing procedures are all controlled by testing software.

Auto testing instrument is made up of test fixture and detection controller two major parts.Test fixture mainly is fixing measurand and take test volume and provide sample working power and test control signal, and it is made up of physical construction, contact probe and photosensitive device.The internal fixation carriage can be changed according to the difference of measurand, and the assurance measurand is stablized in testing process and is not mechanically damaged.

Detecting controller is made up of metering circuit, control circuit, microprocessor and test procedure.It is to handle sampling test signal of coming and the control signal of sending test event, according to test procedure sampled signal is carried out computing and differentiation.Before the beginning official testing, programmed instruction can detect the power supply standby condition of sample and the original state of each function earlier, is only satisfying under the status condition that presets, and controller just can begin test by test procedure.It can produce the trigger pulse of 45uS-2mS, detects whether synchronous corresponding trigger pulse width of flash time simultaneously.It can work out the trigger pulse of any different time length by sample requirement.Can between 250V-340V, set trigger voltage value arbitrarily.Test procedure write by test request finish and input microprocessor after, operating personnel only need be by a start button, tester can be finished test automatically, and test result is presented on the LCD.Do not pass through as a certain test.It also can show the defective content, provides information to the personnel of reprocessing, so greatly reduce working strength.Because the whole test process full automation, operating personnel can operate several testers simultaneously, have improved work efficiency.And its is simple in structure, is convenient to safeguard, cheap for manufacturing cost, and can satisfy automatic quantitative test and detection, is fit to very much large-scale production line.

Description of drawings:

Fig. 1 is the circuit diagram of this tester

Fig. 2 is the external form figure of this tester

1. clamp base among the figure (tape test interface); 2. specimen; 3. test bracket; 4. photosensitive detector box; 5. operating grip; 6. test controller power switch; 7. alarm lamp; 8. test passes pilot lamp; 9. detecting information display; 10. reset button; 11. test starting pushbutton switch; 12. anchor clamps pressing plate.

The full embodiment of tool:

Specimen 2 is placed on the test bracket 3, depress handle 5 then, anchor clamps pressing plate 12 can pin automatically, press test starting button 11, tester can be tested automatically by test procedure, the detecting information display can show test event and result successively by the test order, when sample did not pass through a certain test, alarm lamp 7 can be bright, can ring with hummer in opportunity, display shows the fault content, need to press reset button 10 before the test again, press the test starting button then, otherwise, sample is by all tests, and test passes lamp 8 can be bright.

Claims (3)

1. a flashlamp automatic test instrument for function partly is made up of anchor clamps and test controller two, the feature of test fixture is to be manual self-locking structure, when operating grip is depressed, connecting rod on the handle promotes pressing plate and descends, pressing plate and sample are fixed on the test interface, and at this moment, connecting rod becomes vertical 90 ° with the anchor clamps pressing plate, automatically pin pressing plate, anchor clamps are unclamped.Its load support can protect measured object before test, to load and test after in the process of taking off, keep sample steadily, can not make the crooked and damage electronic component of sample.Winding displacement with 20 cores between anchor clamps and the controller is connected.Test controller is interior to be measurement and the control circuit that main electron device is formed with microprocessor and A/D converter.

2. tester according to claim 1, the main electronic devices and components in its circuit are 89C52 microprocessors, and optical inductor is the 3DU5 phototriode, and A/D converter adopts the TLC2543 device.The 6M crystal oscillator provides standard clock signal for microprocessor; The accurate voltage stabilizer of TL431 provides 5V reference voltage for A/D converter; The digital signal of A/D converter output directly enters microprocessor.The voltage at flash of light electric capacity two ends enters the emitter follower IC7 that the OP27 amplifier is formed after the potential-divider network dividing potential drop of R27, R28 and R29 composition, because IC7 has high input impedance, so can guarantee does not influence its charging voltage when detecting flash of light electric capacity both end voltage.The detection signal of IC7 output is sent into microprocessor and is measured and differentiate.Microprocessor is by 7406 not gates output control signal, and work startup, flash of light, discharge and the LED of control sample indicate.P00～P07 and P20～P22,11 data delivery outlets are directly exported metrical information and are shown to LED.Two groups of 5V, one group of 3V and one group ± 15V direct supply are as the working power of controller and sample.

3. test procedure is to be formed by C language compilation, aims at the flashlamp functional test by the test event order and writes.