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| Number | Title | Issue Date |
| 7106008 | Flashlight control circuit A flashlight control circuit is provided to control the flash according to an exposure voltage and a predetermined voltage. Either a first comparator, second comparator and logic gate or a comparator, a first inverter, a first transistor, a first logic gate and a se... | 09/12/2006 |
| 6571061 | Uniform flash-emission controller A uniform flash-emission controller which controls an intensity of a light emission of a flashtube, the uniform flash-emission controller includes an IGBT which causes the flashtube to emit a rapid series of short flash pulses; an IGBT controller which sw... | 05/27/2003 |
| 6556790 | Electronic flash device An electronic flash device includes: a flash light emission circuit that performs a flash light emission; a light emission control circuit that supplies power for light emission to the flash light emission circuit in response to an input of a light emissi... | 04/29/2003 |
| 6381414 | Oscillation circuit and strobe device employing the oscillation circuit A lens-fitted film unit incorporating a strobe device, comprises: a main body; a photographic film loaded in advance in said main body; a shutter; a photographic lens; and a strobe circuit included in said strobe device, said strobe circuit comprising, a ... | 04/30/2002 |
| 6081076 | Fill-in light emitting apparatus and still video camera A fill-in light emitting apparatus having an illuminating mechanism for emitting illumination light whose color temperature can be varied; a color temperature metering mechanism for measuring the color temperature of the external light; and a color temper... | 06/27/2000 |
| 6034486 | Electronic flash device The present invention relates to an electronic flash device which, even if the charged voltage of a main capacitor is low, can securely effect a trigger operation by making a trigger voltage higher than the charged voltage of the main capacitor.... | 03/07/2000 |
| 6009281 | Flash device A flash device comprising a power source; a main capacitor adapted to be charged by the power source; a flash firing unit operable to consume charge stored in the main capacitor to emit a flash light; a switching unit disposed in a discharge loop for the ... | 12/28/1999 |
| 5752102 | Electronic flashing device An electronic flashing device includes a booster circuit for boosting a power supply voltage to a predetermined voltage, a main capacitor charged via the booster circuit, a light emission tube for emitting light according to a charge charged on the main c... | 05/12/1998 |
| 5717962 | Electric flash apparatus using MOS controlled thyristor A power supply circuit includes a booster circuit for boosting an output voltage from a power supply battery to predetermined positive and negative voltages, respectively. A main capacitor is charged by the predetermined positive or negative voltage boost... | 02/10/1998 |
| 5678077 | Electronic flash device and camera equipped with said device The oscillating switching element of step-up transformer comprises a dedicated high-frequency FET and is placed between center tap of the primary coil and the ground of the primary circuit. Terminal of the primary coil on the side of the ground is connect... | 10/14/1997 |
| 5640620 | Radiation regulating device for an electronic flash device and method for regulating same With an electronic flash device that utilizes an IGBT, circuit construction can be simplified using a single condenser as both the trigger condenser of a trigger circuit and the voltage doubling condenser. In addition, because the recharging of the multi-... | 06/17/1997 |
| 5313247 | Flash device A flash device comprising a power source; a main capacitor adapted to be charged by the power source; a flash firing unit operable to consume charge stored in the main capacitor to emit a flash light; a switching unit disposed in a discharge loop for the ... | 05/17/1994 |
| 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 IGBT (104). To the gate of the IGBT (104), bias voltage i... | 02/02/1993 |
| 5180953 | Strobo device A strobo device in accordance with the present invention is provided with an insulated gate bipolar transistor connected to a flash discharge tube in series and a step-up capacitor to step up a voltage between the main electrodes of the flash discharge tu... | 01/19/1993 |
| 5159381 | Electronic flash control circuit An improved electrical circuit for controlling the firing time of an electronic flash tube. The electrical circuit includes a storage capacitor that is chargeable by a suitable power source, a flash tube and an insulated gate bipolar transistor (IGBT), wh... | 10/27/1992 |
| 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 receiving a light-emission stopping command of a very short... | 07/14/1992 |
| 5107292 | Electronic flash unit In an electronic flash unit, a voltage applying device is provided to apply a predetermined voltage to the gate of an insulated gate bipolar transistor (IGBT), connected in series with a flash tube, for controlling the light-emission operation of the flas... | 04/21/1992 |
| 5075714 | Electronic flash apparatus An electronic flash apparatus uses a voltage-controlled switching device, such as an insulated gate bipolar transistor, for controlling the start and termination of flash emission from a flash discharge tube. A peak voltage of an oscillation generated in ... | 12/24/1991 |
| 5053802 | Electric flash apparatus An electric flash apparatus of the present invention is actuated to emit light by application of a trigger signal issues by a trigger circuit (5) after a power transistor (4), such as, an I.G.B.T. (insulated gate bipolar transistor) connected in series wi... | 10/01/1991 |
| 5038080 | Electric flash apparatus An electric flash apparatus of the present invention has an Insulated Gate Bipolar Transistor (I.G.B.T.) for controlling the light emission actuation of the strobe tube (Xe), which is connected to the strobe tube in series, a switching element (11) for su... | 08/06/1991 |
| 4839686 | Flash device An improved flash device which is characterized in the provision of a power source, a main capacitor adapted to be charged by the power source, a flash firing unit operable to consume charge stored in the main capacitor to emit a flash light, a trigger ci... | 06/13/1989 |
