CN2814888Y - Intelligent light modulating industrial negative film viewing lamp - Google Patents

Abstract

The utility model relates to a detection device, particularly an intelligent light modulating industrial negative film viewing lamp which can be used for detecting photographic negative films. The utility model is composed of a film viewing lamp body and a control circuit, wherein the light intensity control of the control circuit adopts an LC resonance tank circuit; the LC resonance tank circuit can be driven by changing a half bridge of an MOSFET switch tube of driving frequency and impulse width, and the LC resonance tank circuit can detune. The luminance of a fluorescent lamp can be changed by controlling the current and the voltage phase of the half bridge. The driving frequency of PWM regulation duty ratio and the LC resonance tank circuit can be realized by a single chip computer. The luminance setting memory adopts the single chip computer and an EEPROM memory. The fluorescent lamp can be driven by a fluorescent lamp circuit network. Fluorescent lamp assemblies of the film viewing lamp body adopt stagger double-layer arrangement. Reflectors adopt irregular convex-concave reflection mirror surfaces. The utility model solves the problems that the film viewing and the film evaluation of industrial negative films of various exposure conditions and density degrees are difficult.

Description

Intelligent diming industrial negative film viewer

Technical field

The utility model relates to a kind of checkout equipment, particularly a kind of intelligent diming industrial negative film viewer that detects photographic negative.

Background technology

At present, it is 100000 luxs that common industrial egative film viewbox adopts thermal light source can meet the requirements of brightness, but its caloric value is big, use often, the roasting distortion of industrial egative film can be scrapped (the necessary end of the viewbox surface temperature of requirement is in 50 degrees centigrade), the high light of viewbox is harmful to operator's eyes in the use; And the viewbox brightness of adopting cold light source does not reach the brightness that the high density egative film is observed, and causes that high egative film evaluation occurs mistake easily or is difficult to provide conclusion to density.

Summary of the invention

The purpose of this utility model is to propose a kind of intelligent diming industrial negative film viewer, automatic preheating build-up of luminance when being implemented in the viewbox unlatching, enter the run-up mode of minimum brightness behind the build-up of luminance immediately, the operator can select the light intensity of suitable prior memory in computer to see sheet and comment sheet according to the density of egative film, removes the run-up mode that low-light level was discerned and entered to the egative film computer-chronograph automatically.Low, easy to operate according to egative film placement location intelligent dimming, protection operator eyes, caloric value, solved the problem that other industrial egative film of various conditions of exposures and density level is seen sheet and commented the sheet difficulty.

The utility model is achieved through the following technical solutions:

Intelligent diming industrial negative film viewer is made up of viewbox body and control circuit, and the LC resonant groove path has been adopted in light intensity control in the control circuit; Change the switch mosfet pipe half-bridge driven LC resonant groove path of driving frequency and pulsewidth, make the off resonance of LC resonant groove path; The electric current and the voltage-phase of control half-bridge change brightness of fluorescent lamp; Use chip microcontroller PWM to regulate the driving frequency of duty ratio and LC resonant groove path; Brightness is provided with memory and uses single-chip microcomputer and eeprom memory; Driving fluorescent lamp adopts the fluorescent lamp circuit network; Fluorescent lamp group in its viewbox body adopts staggered dual layer arrangement, and its reflector adopts irregular convexo-concave mirror face.

The viewbox body also includes housing, charactron, button, watch window, egative film transducer, electronic component.

Advantage of the present utility model and effect are:

1. the utility model is to be used for the equipment that the industrial nondestructive testing photographic negative is seen sheet, commented sheet, finishes the inspection of Non-Destructive Testing photographic negative, by the light source of viewbox the measurand of industrial nondestructive testing photographic negative institute exposure image is analyzed.The function, the performance requirement that meet the Non-Destructive Testing industrial standard, the function with an automatic light meter of satisfactory high-high brightness and protection operating personnel eyes.Have and adapt to the light intensity memory function that various conditions of exposure egative films are observed.

2., cold light source luminance shortage big at the thermal light source caloric value that exists; and present domestic like product does not have the problem to operating personnel's eye protection; the utility model provides a kind of new industrial egative film viewbox; not only can satisfy other industrial egative film of various conditions of exposures and density level is seen sheet and commented the needs of sheet, but also tool intelligent dimming, light intensity memory, protection operator eyes, lower calorific value, characteristics such as energy-conservation, easy to operate.

3. reflector of the present utility model is the metal reflective material, and the convex-concave shape that differs in size is made on the surface, and radiation source from different directions will be reflected to different directions by reflector, forms the reverberation of illuminance distribution, does not injure operating personnel's eyes.

4. the utility model design has the adjustment button, has also disposed foot switch, can free both hands and be convenient to see sheet fast, comment the sheet operation with the work of foot control system lamp, and is simple, convenient.

Description of drawings

Fig. 1 is a viewbox structural representation of the present utility model;

Fig. 2 is a viewbox structure left view of the present utility model;

Fig. 3 is a viewbox reflector schematic diagram of the present utility model;

Fig. 4 is a viewbox reflector enlarged left view of the present utility model;

Fig. 5 is viewbox circuit theory diagrams of the present utility model.

Embodiment

The utility model adopts energy-efficient mercuryvapour fluorescent lamp arranged crosswise, utilize LC resonant groove path and converter technique to realize the fluorescent lamp preheating, build-up of luminance, brightness regulation, circuit is by Single-chip Controlling, combine the memory storage of computer, operational analysis, be convenient to realize that numeral shows and the ability of button operation, automatic preheating build-up of luminance when being implemented in the viewbox unlatching, enter the run-up mode of minimum brightness behind the build-up of luminance immediately, the operator can select the light intensity of suitable prior memory in computer to see sheet and comment sheet according to the density of egative film, removes the run-up mode that low-light level was discerned and entered to the egative film computer-chronograph automatically.Present technique has adopted the LC resonant groove path in light intensity control, utilize switch mosfet pipe half-bridge driven LC resonant groove path, change driving frequency and pulsewidth, make the off resonance of LC resonant groove path, the electric current of control half-bridge and voltage-phase guarantee that the tube voltage drop of fluorescent lamp reaches the purpose of brilliance control.Computer has adopted PIC16F8778 position single-chip microcomputer, 10 eeprom memory and 4 buttons that can preset brightness storage usefulness.Disposed foot switch, can free both hands and be convenient to see sheet fast, comment the sheet operation with the work of foot control system lamp.

As shown in Figure 1, 2, scheming at the middle and upper levels, fluorescent tube (12) is staggered with lower floor's fluorescent tube (13), the direction of arrow from figure (14) is watched, lower floor's fluorescent tube (13) replenishes the slit that upper strata fluorescent tube (12) forms, its profile of reflector (11) as shown in Figure 2: the light reflected back watch window (8) of direction of observation (arrow (14) rightabout) dorsad.

Among the figure: (1) is the viewbox housing, (2) be to switch to preset the indication charactron of brightness, (3) be the charactron that is used to show default brightness, (4) be the high-high brightness button, (5) be default brightness and setting button, (6) be that brightness increases the adjustment button, (7) are that brightness reduces to adjust button, and (10) are circuit board and electronic component.

After the viewbox energising, fluorescent tube preheating build-up of luminance, if egative film detecting sensor (9) does not detect egative film be placed on viewbox before, fluorescent tube will be reduced to minimum brightness.The user can or trample foot switch (15) and select default brightness by button (5), or increases and decreases brightness by button (6) and (7) under certain default brightness, sees sheet and comments sheet with the egative film that is fit to different densities.

Shown in Fig. 3,4, reflector is metal (surface has the aluminium sheet of a dense oxidation film) reflectorized material, the convex-concave shape of shown in Figure 4 differing in size (approximately 3-6 millimeter size) is made on the surface, radiation source from different directions will be reflected to different directions by reflector, form the reverberation of illuminance distribution.

As shown in Figure 5, coil T1, T2, T3 and fluorescent tube P1, P2 among the figure, P3, P4 form the fluorescent lamp circuit network, and L1A-L1H is the auxiliary winding of L1, with the electric capacity composition filament preheating circuit of connect with it.L1 and C16 are the series resonance tank circuit, produce resonance under the driving of half-bridge M1, M2 drive circuit.The pulse-width signal of the PWM1 of single-chip microprocessor MCU, the output of PWM2 pin drives half-bridge circuit through driving triode Q1, Q2 and isolating transformer TQ.LED is digital display tube.Be used to detect egative film whether at the window of viewbox near switch P T, be used for the output of MCU control PWM1, PWM2, the output minimum pulse width does not make lamp works at minimum brightness when having egative film; The default pulsewidth of PWM1, PWM2 output made lamp works in default brightness when egative film was arranged.Foot switch KT or button K2 are used to switch the default in advance brightness of 0-9.The K1 button is pressed MCU by high-high brightness control fluorescent lamp circuit network, removes until egative film.K3, K4 are used for finely tuning brightness under certain default brightness.Resistance R 22, R23, R24, R21, C5 form the current detecting network, the half-bridge drive circuit overcurrent is detected, when preheating, preheat curent is carried out indirect detection, reach the preheat curent of the fluorescent lamp of use when preheat curent, when reaching warm-up time of fluorescent lamp of use warm-up time, the Micro Controller Unit (MCU) driving half-bridge circuit makes L1, the complete resonance of C16 resonant groove path trigger fluorescent lamp lighting.FUSE is a fuse, and L2, C12, LEMI form EMI and absorb circuit.Wave circuit is considered in diode D1, D2, D3, D4, capacitor C E full-wave rectification.Capacitor C 6, R10 isolate LC resonant groove path and fluorescent lamp circuit network.Realize that by using single-chip microcomputer and eeprom memory the brightness of viewbox is provided with memory.

The utility model adopts the fluorescent lamp circuit network to realize being driven by a cover drive circuit function of several fluorescent lamps.Adopt staggered dual layer arrangement fluorescent lamp group to improve the maximum brightness of viewbox.Adopt irregular convexo-concave mirror face to make reflector, improve the viewbox luminance uniformity.

Housing top is sub-assembly, can disassemble, and circuit board, reflector, fluorescent lamp are fixed on the bottom, removes the maintenance overhaul easily of upper body housing.Fluorescent lamp adopts staggered dual layer arrangement to strengthen ray density.

Claims (2)

1. intelligent diming industrial negative film viewer is made up of viewbox body and control circuit, it is characterized in that the LC resonant groove path is adopted in light intensity control in the described control circuit; Brightness is provided with memory and uses single-chip microcomputer and eeprom memory; Driving fluorescent lamp adopts the fluorescent lamp circuit network; Fluorescent lamp group in its viewbox body adopts staggered dual layer arrangement; Its reflector adopts irregular convexo-concave mirror face.

2. intelligent diming industrial negative film viewer according to claim 1 is characterized in that described viewbox body also includes housing (1), charactron, button, watch window (8), egative film transducer (9), electronic component (10).

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