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5250978 |
Flashing device
A flashing device associated with a camera is provided with a light emitting member, a condenser that is charged to supply electricity to the light emitting member, and a charging circuit for...
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5249007 |
Strobe apparatus
The strobe apparatus of the present invention applies upon both the ends of the flash discharging tube the oscillating voltages to be caused in the primary winding of the trigger transformer by the...
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5221942 |
Controlling charging of a flash device
A flashing device that emits light toward an object, in which a condenser for supplying electricity to a light emitting member is charged by a charging circuit. A timer is provided for measuring a...
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5196766 |
Discharge circuit for flash lamps including a non-reactive current shunt
A discharge circuit for and method of operating a flashlamp are disclosed in which the flashlamp is reliably operated repetitively while reducing current surges from the electrical power source. A...
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5187410 |
Electronic flash device
An electronic flash device includes a flash discharge tube, an IGBT, connected to the flash discharge tube, for controlling light emission, a trigger means for driving the flash discharge tube, an...
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5184171 |
Electronic flash device
In an electronic flash device according to the present invention, a main condenser (101) charged by a high power voltage supply (100) is connected in series with a flash discharge tube (102) and an...
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5172031 |
Hermetically sealed type electronic flash device
A hermetically sealed type electronic flash device comprises an electric circuit device comprising a main capacitor storing light emitting energy therein prior to light emission, a light emission...
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5146250 |
External power source for electronic flash
An external power source, for an electronic flash unit, includes a battery, a voltage step-up circuit for starting a voltage step-up operation of the battery voltage in response to a start signal...
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5130738 |
Electronic flash unit driver by insulated gate bipolar transistor
An I.G.B.T. (Insulated Gate Bipolar Transistor) driven electronic flash unit includes a control switch for controlling an off-operation of the I.G.B.T. The control switch has a first terminal for...
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5115169 |
Flash light control circuit
An object of the invention is to provide a flash light control circuit by which a flash bulb is controlled to maintain a constant quantity of emitted light at each flash, in order to counter an...
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5111233 |
Electronic flashing device
An electronic flashing device comprises a flashing discharge tube for emitting light by a charge stored in a main capacitor, a voltage controlled switching device driven by a voltage applied to a...
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5111116 |
Stroboscopic controller
A stroboscopic controller for illuminating a photographed object by discharging a charge stored to a main capacitor through a light emitting tube has a voltage measuring device for measuring a...
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5109244 |
Electronic flash apparatus for cameras
In a camera system including an electronic flash apparatus, a main capacitor of the flash apparatus is charged for a predetermined time interval, in response to a preparatory operation such as a...
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5101335 |
DC-to-DC converter using coupled inductor current sensing and predetermined on time
A DC-to-DC converter is operated in accordance with a predetermined primary circuit ON time and a sensed predetermined secondary circuit current level to provide improved charging performance and...
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5068575 |
Indirect storage capacitor voltage sensing means for a flyback type DC-to-DC converter
In a flyback type self-oscillating DC-to-DC converter, a voltage sensing means indirectly senses the storage capacitor voltage and indicates when the voltage across a storage capacitor has been...
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5048955 |
Device for measuring color temperature
A device for measuring color temperature, having at least one measuring diffuser and at least one indicator for the color temperature, as well as operating elements for turning the device on and...
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5046152 |
Ignition circuit for a gas discharge lamp
Ignition circuit for a gas discharge lamp. In the ignition circuit, the generating of uniform current pulses for ignition over the entire useful life of the gas discharge lamp is guaranteed. A...
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5034662 |
Apparatus for controlling the charging of a main capacitor of a flash unit
An apparatus is provided for controlling the charging of a main capacitor of a flash unit. Comparison means detect the timing at which a voltage V across the main capacitor reaches a reference...
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5027039 |
Electronic flash apparatus
In an electronic flash apparatus, a flash preparation signal is sent from a signal generating means to a first switching device at a first timing preceding the flash emission, the first switching...
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5023470 |
Electronic flash charging circuit
An electronic flash charging circuit for use with a camera having a power source common to a microcomputer that controls a plurality of camera functions and to an electronic flash. The charging...
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5013973 |
Power supply for intermittently operated loads
A power supply for intermittently energized loads, particularly gas discharge tubes employed as high intensity lights, has a pair of capacitances which are charged to a high voltage level to...
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5004958 |
Strobe apparatus
A series connection of a reverse direction diode 10 and a main capacitor 2 is connected across both terminals of a DC power source 1. Another series connection of a strobe tube 3 and forward...
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4992923 |
Electrical power supply, fusing apparatus and recording apparatus using the same
Disclosed is an electrical power supply for use, for example, for a flash fusing device in an electrophotographic recording apparatus, in which a DC high voltage is generated from a low voltage of...
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4985725 |
Auto-flash photographing system
An auto-flash photographing system includes a flash lamp unit, a photometry unit for detecting light reflecting from a subject of interest, a reference setting unit, a comparator, and a trigger...
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4951080 |
Device for controlling the amount of emission of electronic flash apparatus
A light emission controlling device for an electronic flash apparatus includes a first photometric unit for metering a first region of an object field in a weighted manner and outputting first...
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4942340 |
Arrangement for displaying operation of booster circuit for flash device camera
In the oscillating booster circuit of an electronic flash device for a camera arranged to boost the output of a DC low voltage source by a blocking oscillator circuit and to make it into a DC high...
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4910438 |
Wide band, high efficiency simmer power supply for a laser flashlamp
Methods and apparatus are disclosed for supplying and controlling simmer current to a flashlamp 28. A direct current-to-direct current converter including a transformer 12, full-wave bridge...
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4908552 |
Electronic flash unit
This invention concerns with an electronic flash unit in which, as two capacitors of large and small capacitances are charged, even when a trigger operation is actuated before the capacitor of...
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4900990 |
Method and apparatus for energizing a gaseous discharge lamp using switched energy storage capacitors
A trigger circuit is coupled to a gas discharge lamp having anode and cathode terminals, a minimum anode voltage and a minimum holding voltage. The trigger circuit periodically transmits a trigger...
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4899087 |
Triggering circuit for series connected flash lamps
Lamp operating voltage levels are reduced by using a boost circuit to initiate a triggering sequence in one of two lamps connected in series. The boost circuit is connected across one of the lamps...
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4899092 |
Juxtaposed discharge tubes with opposed trigger electrodes
A light emitting device wherein one of a plurality of juxtaposed discharge tubes which is to remain not emitting light is prevented from being caused to emit light by induction by an adjacent one...
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4894588 |
High efficiency flasher
A heavy duty flasher for incandescent lamps for a motor coach or the like incorporates a pair of power MOSFETs in parallel for efficient, cool operation and includes a pair of timers, one for flash...
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4881013 |
Flash photographic apparatus
In a flash photographing apparatus, a flash device is arranged to slow the rise of flashing characteristic thereof at the initial stage of flashing. To attain this purpose, the electric charge of a...
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4853600 |
Flash apparatus with color temperature control
The illumination device includes a charging part, an energy storage device, a flash tube and an amplitude control device, by means of which the energy storage device can be charged to different...
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4847538 |
Electronic flash equipment
Electronic flash equipment in the present including a Field Effect Transistor which is connected to a flash tube in series and a voltage control structure which controls the conductivity of the...
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4843229 |
High light level cutoff apparatus for use with night vision devices
There is disclosed a high light level cutoff apparatus for use with night vision devices. The apparatus employs a digital method of timing implemented by a divider counter responsive to a crystal...
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4839566 |
Circuit for supplying power to a dental photopolymerizing apparatus
An electric lamp for the photopolymerization of dental materials is supplied with constant electric power so that constant light output is obtained. The control circuit used to this end operates...
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4816854 |
Close-range lighting flash device
A close-range lighting flash device comprising an electronic flash unit including a plurality of xenon tubes, an illuminator unit provided integrally in the flash unit and including a plurality of...
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4798996 |
Electronic photoflash control circuit
A control circuit for a photoflash gun capable of fast recycling times, including a flashtube (FT), a switching circuit (SW, L1) for initiating operation of the flashtube, a switch (CR1) in series...
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4780649 |
Metal vapor lamp having low starting voltage
A high-intensity discharge (HID) metal vapor lamp and starting apparatus includes a metal vapor lamp having an outer envelope containing a gas filled arc tube, the fill gas including xenon, the arc...
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4779027 |
DC to DC converter with overvoltage protection circuit
An overvoltage protection circuit limits the output voltage of a DC to DC converter to a maximum desired output voltage. An output voltage sensing circuit includes a semiconductor device such as a...
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4772805 |
Lamp illumination adjusting apparatus
A lamp illumination adjusting apparatus for automobiles comprises a reference triangular wave generator, an adjusting voltage setting circuit, a comparator to compare the reference triangular...
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4771301 |
Apparatus for flash photography
An apparatus for flash photography being of the type in which for one shot a number of different flash tubes are time-serially fired and the amount of flash light emitted from each flash tube is...
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4754389 |
Voltage regulating circuitry for a DC to DC converter
Voltage regulating circuitry maintains a load voltage of a DC to DC converter within a prescribed range. For that purpose, an SCR latching switch is connected to conduct upon the load voltage...
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4751436 |
Device for boosting power supply voltage
A device for boosting power supply voltage is provided with a transformer having a secondary winding which generates an elevated voltage when the power supply current is supplied to the primary...
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4748382 |
Electric circuit arrangement
An electric circuit arrangement for use in energising a flash tube (3) to provide a series of pairs of flashes, each pair consisting of a main flash and a rapidly following second flash, includes...
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4745613 |
Laser flash lamp triggering circuit
A laser flash lamp triggering circuit is connected in parallel with the flash lamp and between the flash lamp and the flash lamp power supply. A impedance element is connected between the parallel...
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4742277 |
Pulse generating apparatus for xenon lamp and lighting method thereof
A pulse generating apparatus includes a base current supply section for generating a constant DC current having a first prescribed current level for turning on a xenon lamp, and a pulse current...
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4737806 |
Apparatus for flash photographing
An apparatus for conducting flash photographing by a camera capable of incorporating or setting therein a flashlight device and generating a trigger signal at full opening of a shutter, and a...
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4727297 |
Arc lamp power supply
An improved high power (40,000 watt) high intensity arc discharge power supply which provides reliable, automatic ignition control and enables precise variation of lamp power in dual AC and DC...
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