Abstract: Semiconductor piezoresistive devices can be obtained by the plasma CVD method, i.e., exposing a substrate to a plasma atmosphere produced from silicon hydride gas containing boron hydride to deposit on the substrate a thin film of crystalline silicon as a piezoresistive material. In accordance with this method, it is possible to form piezoresistive devices into IC's and also to impart excellent properties thereto.

Abstract: An operation indicator for an automatic flashing device comprising a first indication means which visually indicates a reaching to a predetermined voltage of main capacitor and readiness for proper completion of flashing of an automatic light adjusting, and a second indication means which indicates a selected one of them by sound, and a switching means which connects or disconnects said second indication means to the circuit of the device.By the abovementioned construction, the user can realize readiness of automatic flash operation both by eyesight and by audition.

Abstract: In a light angle indicator of photographic flash having a main part containing at least a flash lamp and a front lens part slidably coupled to said main part, the improvement is thatthe light angle indicator comprisesa first indicator panel fixed to said main part and having obliquely disposed transparent regions or windows anda second indicator panel fixed to said front lens part and having obliquely disposed bright marked regionseither of said windows or said bright marked regions having marks or numerals to indicate light coverage angles.

Abstract: The present invention provides a photosensitive material for use in electrophotography which comprises a conductive support having a photoconductive layer coated with a protective layer, the material being superior in light-decay property, mechanical strength and image formability, wherein said protective layer is composed of either (1) a member selected from the group of resins consisting of polyvinyl butyral, polyvinyl acetate, acryl or derivative resins thereof, copolymers of styrene and maleic anhydride or alkyl esters thereof, copolymers of vinyl acetate or derivatives thereof and vinyl pyrrolidone, copolymers of butyl vinyl ether and maleic anhydride or alkyl monoesters thereof and shellac, or of (2) a resin and silane-coupling agent.

Abstract: This invention provides a liquid developer for use in electrophotography which comprises a dispersion of toner particles in a carrier liquid having a high resistivity and a low dielectric constant and is superior in fixability, dispersion stability and redispersability, said toner particles consisting essentially of pigment or dye particles and a non-aqueous dispersion of thermoplastic resinous composition comprising a graft-copolymer and at least one substance selected from wax the groups consisting of polyethylene.

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.