Abstract: The electronic flash unit disclosed comprises: a transformer (14) to vary voltages of a power supply; an accumulator (16) composed of a main capacitor (17) to charge an electric energy supplied from the transformer (14); a lamp unit (4) provided with a flashlamp (20), set inside of a reflector (19), that flashes by discharging of energy storages in the main capacitor (17) upon applying a voltage on a trigger terminal (21); and a trigger circuit (10) to generate the voltage to apply on the trigger terminal (21), wherein at least the lamp unit (4) is coated with an insulation material.

Abstract: The electronic flash unit disclosed comprises: a transformer (14) to vary voltages of a power supply; an accumulator (16) composed of a main capacitor (17) to charge an electric energy supplied from the transformer (14); a lamp unit (4) provided with a flashlamp (20), set inside of a reflector (19), that flashes by discharging of energy storages in the main capacitor (17) upon applying a voltage on a trigger terminal (21); and a trigger circuit (10) to generate the voltage to apply on the trigger terminal (21), wherein at least the lamp unit (4) is coated with an insulation material.

Abstract: The electronic flash unit disclosed comprises: a transformer (14) to vary voltages of a power supply; an accumulator (16) composed of a main capacitor (17) to charge an electric energy supplied from the transformer (14); a lamp unit (4) provided with a flashlamp (20), set inside of a reflector (19), that flashes by discharging of energy storages in the main capacitor (17) upon applying a voltage on a trigger terminal (21); and a trigger circuit (10) to generate the voltage to apply on the trigger terminal (21), wherein at least the lamp unit (4) is coated with an insulation material.

Abstract: The electronic flash unit disclosed comprises: a transformer (14) to vary voltages of a power supply; an accumulator (16) composed of a main capacitor (17) to charge an electric energy supplied from the transformer (14); a lamp unit (4) provided with a flashlamp (20), set inside of a reflector (19), that flashes by discharging of energy storages in the main capacitor (17) upon applying a voltage on a trigger terminal (21); and a trigger circuit (10) to generate the voltage to apply on the trigger terminal (21), wherein at least the lamp unit (4) is coated with an insulation material.

Abstract: A strobe light which emits light by supplying a flash discharge tube with the electric charge stored in a main capacitor uses an aluminum-electrolytic capacitor having a dissipation factor (tan.delta.) of 0.03 or lower, and has voltage controlling means for setting the charge completion voltage of the aluminum-electrolytic capacitor at a predetermined value within 265.+-.35 V.

Abstract: The present invention provides a heat insulation covering for a spherical storage tank such as an LNG tank or the like for storing an extremely low temperature liquid. The covering is constructed by using elongated panel-like heat insulating panels. A plurality of slit parts having a U-shaped cross section are formed along the longitudinal direction of a foam-resin heat insulating panel formed in an elongated panel-like configuration. In the slit part, a heat insulating material is inserted. The material has a sufficient expandability under extremely low temperatures. The heat insulating panel can be deformed along the curvature of the surface of the spherical tank. The heat insulation covering of the spherical tank is formed of the heat insulating panels which have an elongated configuration. With such a structure, only a few kinds of heat insulating panels need be prepared, which is favorable in terms of cost.

Abstract: A printed circuit board includes a wiring pattern formed on an insulating board according to a predetermined electric circuit, and a cover member covering a portion of the wiring pattern used as a contact, the cover member being formed of an electrically conductive and non-solderable material. Due to the presence of the covering member, the wiring pattern portion is not covered with solder when the printed circuit board is subjected to dip soldering to attach various electric components to the printed circuit board. Since the covering member is electrically conductive, the wiring pattern portion can readily be used as a contact when the dip soldering is completed.

Abstract: In a strobo apparatus comprisinga power source part (A) containing a low voltage battery and a DC-DC converter circuit,a flashing part (B) containing a main capacitor and being separably connected with the power source part, and also hasa detecting means for detecting the said separation of the flashing part. By utilizing the output of the detecting means, the operation of the DC-DC converter circuit is compulsorily stopped, accordingly, waste of battery is eliminated and unnecessary high insulation against useless high tension during the separation of two parts can be dispensed with.

Abstract: An automatic photographic flash device wherein the amount of light of the flash tube is automatically controlled in response to intensity of light from the direction of the photographic object by means of an electric circuit A flash tube part is movably installed on a main case part containing a battery and the circuit A switch is installed in the device in such a manner that when the flash tube part is moved to a position not directed at the photographic object, the switch causes the circuit to appropriately increase the amount of light discharged by the flash tube when it is actuated.