Abstract: An electroluminescence light emission apparatus based on a switch circuit formed of a switch element and a thyristor connected in series across a DC power source, and a control circuit for setting the thyristor and switch element in alternating conducting and non-conducting states, with an electroluminescence element being coupled between one terminal of the power source and the junction of the switch element and thyristor to be thereby alternately charged and discharged to produce emission of light.

Abstract: The recording liquid containing at least one of the naphthelenediazoic dyes shown by general formula (I) or (II): ##STR1## as defined in the claim, and a liquid medium for dissolving or dispersing the dye.The recording liquid of this invention has the viscosity and surface tension in the proper ranges, does not cause clogging discharging orifices of an ink-jet recorder and shows good storage stability. Furthermore, the recording liquid gives recorded images excellent in fixing speed, light resistance, water resistance, abrasion resistance and resolution.

Abstract: In an electrophotographic light-sensitive material comprising at least one electric charge generation layer comprising a charge generating substance and a binder resin therefor and at least one electric charge transport layer on an electrically conductive base, said electrophotographic light-sensitive material is a laminate type electrophotographic light-sensitive material wherein the binder resin for the electric charge generating substance contains at least one polyvinylpyridine resin.

Abstract: An electrophotographic light-sensitive medium is described comprising at least an electrically conductive layer, a charge generation layer and a charge transport layer, the charge generation layer containing a dis-azo compound represented by Formula (1) wherein A represents a single bond, ##STR1## B represents a coupler having aromatic properties; and R represents a group selected from hydrogen, a halogen and a lower alkyl having 1 to 4 carbon atoms.

Abstract: A cleaning device for a transferring system wet type electronic copying machine. A cleaning roller is juxtaposed with the photosensitive drum in such a manner that the roller is in contact with the drum so as to absorb developing solution containing toner left on the photosensitive drum. The developing solution containing toner absorbed by the cleaning roller is squeezed out by a cleaning device which depresses the cleaning roller and is then discharged by discharging means.

Abstract: For a distance measuring system in which a light measuring arrangement responds to changes in light to establish distances, a processing circuit includes a quasi-compression device that receives the electrical signal from the light measuring arrangement and maintains the normal gain of an amplifier to amplify the electrical signal when the electrical signal is low. The compression device reduces the amplifier gain when the electrical signal is higher. This narrows the dynamic range necessary for the distance measuring system.

Abstract: An electrophotographic light-sensitive medium is described comprising a light-sensitive layer containing a dis-azo compound represented by Formula (1) ##STR1## wherein A represents a coupler having aromatic properties.

Abstract: An electrophotographic light-sensitive medium comprising a light-sensitive layer containing a dis-azo compound represented by Formula (1) ##STR1## wherein A represents a single chemical bond, a divalent hydrocarbon group containing a conjugated double bond, a divalent hydrocarbon group containing a nitrogen atom in a conjugated double bond, or a divalent heterocyclic group which may be condensed with a benzene ring or substituted and forms a conjugated double bond system in combination with the adjacent azomethine groups, and B and B', which may be the same or different, each represents a coupler having aromatic properties.

Abstract: For a distance measuring system in which a light measuring arrangement responds to changes in light to establish distances, a processing circuit includes a quasi-compression device that receives the electrical signal from the light measuring arrangement and maintains the normal gain of an amplifier to amplify the electrical signal when the electrical signal is low. The compression device reduces the amplifier gain when the electrical signal is higher. This narrows the dynamic range necessary for the distance measuring system.

Abstract: A pick-up system includes means for recognizing the displacement of objects to be photographed relative to the optical reproduction plane. The shutter of the pick-up system is actuated according to the relative motion of said objects. In a pick-up system comprising a variable diaphragm and a replaceable film of a special sensitivity, e.g. in an automatic camera, the shutter speed, being a function of the relative motion of the objects, determines the aperture of the diaphragm with respect to the sensitivity of the film.

Abstract: To check movement of film in still, or motion picture cameras, a movement sensing means is coupled to the film, for example a cam-operated switch coupled to the film payout spindle, an opto-electrical sensor sensing perforations in the film or the like, and generating film motion pulses. The pulses are counted in an evaluation circuit enabled when film movement is commanded, the evaluation circuit providing an alarm output if a predetermined number of output pulses has not been attained. When related to a motion picture camera, a timing circuit is included to check the generation of the number of pulses within a predetermined timing interval.

Abstract: In the disclosed shutter system, a standby mechanical shutter control operates a shutter in response to failure of the power source of a primary electrical shutter control. Normally the power source enables the electrical shutter control to time and operate the shutter. More specifically, in the disclosure, a standby mechanical timer responds to the failure of a power source to actuate a magnet in an electrical automatic timing arrangement, and operates the shutter for a fixed period.

Abstract: A light-transparent photoconductive material for use in electrophotography is the reaction product obtained by condensingA. an organic photoconductive compound containing an amino and/or hydroxyl group andB. a reactive colored compound containing an active halogen atom;Or by condensingA. an organic photoconductive compound containing an active halogen atom andB. a reactive colored compound containing an amino and/or hydroxyl group.