Matches 201 - 250 out of 623 < 1 2 3 4 5 6 7 8 9 10 11 12 13 >
Match Document Document Title
4404496 Light source apparatus using flash discharge tube  
A light source apparatus which comprises a flash discharge tube for illuminating a foreground subject, a switching element connected in series with the flash discharge tube, a light receiving...
4400087 Light measuring circuit  
A light measuring element which is provided with a pulse signal generator for generating pulse signals the duty ratio of which varies in accordance with a coefficient related to the exposure for...
4398127 Electric flash lamp unit with a light controlling circuit  
An electric flash lamp unit is provided with an electric flash lamp and a storage capacitor for supplying energy to the flash lamp unit. An optimum exposure value of a film is previously...
4396870 Electronic flash device  
An electronic flash device provided with an auxiliary winding electromagnetically coupled to a winding in a DC-DC converter which is connected to a main power supply and generates a voltage for...
4395658 Proper light emission indicating device for computer flash device  
In the disclosed device, a sensor produces a corroborating signal when a computer flash unit emits a flash proper for an exposure. A timer energizes an indicator for a predetermined time in...
4393335 Electronic flash device  
In an electronic flash device of the type in which depending upon the exposure conditions an electronic flash lamp converts into light the energy stored on a main flash capacitor or the energies...
4389596 Photometry power supply for automatic electronic flash  
A photometry power supply for automatic electronic flash comprises an impedance element through which part of the charge stored across a main capacitor of the electronic flash discharges to develop...
4385818 Multiple electronic flash controlling apparatus  
An electronic flash assembly including a plurality of flash units for illuminating an object, one of which determines reflected light from the object being photographed and also produces a...
4384238 Electronic strobe flash apparatus for indirect and direct flash  
Electronic strobe flash apparatus includes a first energizable flashtube arranged to project light for reflection from a surface to illuminate a scene indirectly, and a second energizable flashtube...
4382666 Indicating device for computer type electronic flash apparatus  
An indicating device of computer type electronic flash apparatus has a plurality of display members representing respective limited distance ranges for correct exposure of an object to be...
4382211 Electric flash device  
An electronic flash device having a battery, means for converting the battery voltage to alternating current voltage, means for rectifying the alternating current voltage to direct current voltage,...
4377774 Electronic flash control device  
A control circuit controls the amount of light emitted from an electronic flash tube in accordance with the voltage of a main capacitor, which energizes the flash tube, and a set guide number so...
4374345 Electronic flash apparatus  
The voltage on an electronic flash tube or a main capacitor is detected by a voltage detecting circuit, and when the detected voltage reaches the discharge continuous voltage of the flash tube, a...
4371811 Electronic flash gun structure  
To permit easy handling and pivoting of the flash head of a flash gun using n elongated flash tube, in which the reflector units are rotatable relative to each other, a tubular structure (2) is...
4369395 Electronic flash with safety switch feature  
A safety switch arrangement is provided for an electronic flash for automatically discharging the main storage capacitor in response to the user deliberately or inadvertently removing the cover...
4368966 Photographic system including remote controllable flash unit  
A photographic system including a flash unit wirelessly controlled. The system comprises a controller interlocked with the photographic camera and a flash unit operable in response to the...
4360764 Flash unit having plural flashlamps  
An electronic flash unit is disclosed which includes one flashlamp arranged to illuminate an object from the front side thereof and another flashlamp which is rotatably mounted and arranged to...
4349260 Automatic electronic flash device producing preliminary flash light and primary flash light  
An automatic electronic flash device capable of producing both a preliminary flash light used for automatic determination of a diaphragm aperture of a camera and a primary flash light used for...
4344680 Photographic devices for controlling flash photography  
In a photographic system for flash photography, the firing current of an electronic flash tube is selectively restricted in accordance with the detection of whether or not the flash light amount...
4344020 Electronic flash device capable of automatic flash duration adjustment  
In an electronic flash device, in order to control the discharge through a flash lamp for converting the energy stored on a main discharge capacitor into light; that is, in order to control the...
4336582 Energy saving DC-DC converter circuit  
An energy saving DC-DC converter circuit is disclosed having two energy efficient means which operate in tandem, an energy conserving means (30, 8, 1) and a voltage doubling means (26). These...
4336481 Method of and apparatus for automatic electronic flash lamp control  
The amount of light to be produced in an electronic flash lamp apparatus, which is required to take a picture under proper exposure conditions, is predetermined depending on the object distance,...
4330737 Electronic flash system  
There is disclosed herein an electronic flash system which obviates the need for the typical large capacity main capacitor as the power source for the flashtube. The system includes a conventional...
4329623 Electronic flash apparatus  
An electronic flash apparatus comprises a flash lamp and a semiconductor switching element which are connected in series across a main capacitor, and a flash control circuit which measures light...
4329624 Computer type electronic photoflash  
A computer type electronic photoflash consisting of a main photoflash unit having photoflash emission and photoflash light volume control functions and a plurality of adapters connectable thereto....
4323822 Electric flash device  
This invention discloses an electric flash device which comprises a direct current power source circuit, a flash tube circuit including a flash tube, a voltage convertor including an oscillator...
4319165 Electronic flash apparatus with function to bounce flash  
An electronic flash apparatus provided with a main flash apparatus having a first flash discharge tube and a sub-flash apparatus having a second flash discharge tube. The sub-flash apparatus is...
4317620 Variable proportional fill flash  
A photographic exposure and flash fire control system initially measures ambient scene light and subsequently utilizes the results of that measurement to control the amount of artificial...
4317070 Circuits for flash equipment  
A circuit for flash equipment having a trigger control switch or an SCR with its gate lead connected to a condenser through a switching transistor which is rendered conducting when the main flash...
4311372 Computer controlled electronic flash  
An electronic flash unit has a flash tube and a flash circuit which includes an internal light sensor that interrupts the supply of electricity to the flash tube when it senses that the flash light...
4310785 Electronic photographic flash apparatus  
In an electronic photographic flash apparatus comprising a DC-DC converter, a high tension capacitor, and a gas-discharge flash tube to produce a light flash by consuming electric energy stored in...
4306281 DC-DC Converter for electronic flash unit  
In a DC-DC converter for an electronic flash unit disclosed, an npn transistor is used as an oscillating transistor. The emitter of the npn transistor is connected to a main capacitor of the flash...
4303849 Process and apparatus for charging a capacitor and application of the process  
A process and apparatus for charging a capacitor, particularly for flash guns with a fast flash series, so as to achieve a short charging time while avoiding a high charging current pulse, the...
4302707 Electric flash discharge device  
An electric flash discharge device comprises a capacitor charged by a power source, a trigger device including an operating member for producing a trigger signal in response to the actuation of the...
4301392 Electronic flash system capable of automatic flash duration control  
In an automatic flash duration controllable electronic flash system of the type in which in response to the quantity of light reflected back from a subject illuminated by the flash light emitted...
4298826 Automatic flash unit  
A series control type automatic flash unit which is capable of achieving completely controlled flashing by controlling electrical energy supplied from a main capacitor to a discharge lamp by means...
4294528 Automatically controlled electronic flash device  
An automatic electronic flash device for use with a camera includes a flash tube carried by a housing. A battery is carried by the housing as a source of electric supply. A capacitor is connected...
4290692 Photographic strobe apparatus  
A strobe apparatus for reducing contrast index in photographic copies by employing an illumination pulse of short duration includes a source energizable at both a relatively high level to provide...
4288722 Electronic flash device  
A control circuit for an electronic flash device is disclosed. The control circuit is connected to a commutating capacitor and includes a coil connected in parallel to the capacitor and switching...
4274724 Indicator circuit for auto-strobo unit  
An indicator circuit for an auto-strobo unit comprises a switching element which rapidly discharges a capacitor which, when adequately charged, feeds a display element indicating proper operation...
4275335 Constant light intensity electronic flash device  
The emitted light intensity of an electronic flash tube is maintained constant over a given time period by connecting the electronic flash tube in series with an inductor and a switching element...
4272806 DC to DC Converter adjustable dynamically to battery condition  
A battery-powered DC to DC converter is operated dynamically in accordance with the condition of the battery so that an optimum compromise is made between the performance of the battery and the...
4271375 Flash light discharge device  
In a flash light discharge device including a strobo tube attached to a camera body, both the positive and negative outputs of a blocking oscillator are made use of. One output is used for charging...
4271376 Electronic flash  
An improved electronic flash is provided having a selectively energizable source of illumination, control circuits for controlling the source of illumination according to a plurality of operational...
4270079 Flash device  
In the flash device disclosed, a control circuit for controlling the charging operation of a main capacitor is provided with a switching means for forming a path for charging the main capacitor;...
4259615 Photographic flash device  
A photographic flash device comprising a main capacitor for flashing a flash discharge tube, a DC-DC converter, a constant-voltage circuit for controlling the oscillation function of the DC-DC...
4258297 Voltage indicator for a stroboscope  
A voltage indicator for a stroboscope, having a high voltage generator (10), discharge capacitor (12), flash tube (20) and trigger circuit (22), which further comprises a light-emission diode (LED)...
4258294 Control circuit for flash tube apparatus  
A control circuit for flash tube apparatus has a flash tube, a thyristor for controlling the flash tube in ON-OFF fashion, a trigger circuit for triggering the flash tube and thyristor, a...
4258290 Operation indicator for auto-strobo unit  
An operation indicator for auto-strobo unit which includes a single light emitting element capable of indicating the completion of a charging operation or a flashlight illumination of the...
4256994 Actuating circuit for light measuring circuit in electronic flash device  
A computer type electronic flash device is disclosed. The flash device has an auxiliary capacitor for producing a bias voltage which is to be superimposed on the charged voltage across the main...
Matches 201 - 250 out of 623 < 1 2 3 4 5 6 7 8 9 10 11 12 13 >