Abstract: An electrophotography system for use in laser printers, printing machines and copying machines. The system includes a rototable drum having a photosensitive member which can take a first absorption spectrum state and a second absorption spectrum state, the variation from the first absorption spectrum state to the second absorption spectrum state being made by illuminating it with light whose intensity is above a predetermined threshold and whose wavelength is in a first predetermined wavelength region. Also included is an optical system including a light-emitting device for illumination of the photosensitive member so as to form thereon an electrostatic latent image, the optical system being arranged to directly illuminate the photosensitive member with light from the light-emitting device and further to illuminate it with reflected light from an original picture.

Abstract: The present invention provides an improved lining structure composition on the inner surface of a tundish by forming an alumina-silica-base intermediate lining layer over which a magnesian surface coating layer is formed by gunning. It solves the adhesion defect on a refractory lining of the tundish and enables longer operation of the tundish.

Abstract: Information signals are reproduced from a disc-shaped recording medium which was accommodated within a case. The case has a jacket with space for accommodating the disc-shaped recording medium therein and an opening through which the disc-shaped recording medium can enter and leave the jacket. A lid member may be inserted through the opening of the jacket for covering and closing the opening. The apparatus for reproducing the disc comprises an inserting opening through which the case is manually inserted. A holding mechanism holds either the disc-shaped recording medium or the lid member at an innermost part of the reproducing apparatus and on the side opposite of the inserting opening. A turntable is located between the inserting opening and the holding mechanism. A push-back mechanism includes energy storing members which are urged responsive to a disc insertion operation in which the case is inserted through the inserting opening and into the innermost part of the reproducing apparatus.

Abstract: A reproducing apparatus reproduces a disc-shaped recording medium which is accommodated within a case. The case comprising a jacket which has a space for accommodating the disc-shaped recording medium and an opening for allowing the disc-shaped recording medium to go in and out of the jacket, and a lid member inserted through the opening of the jacket for closing the opening of the jacket. The reproducing apparatus comprises an inserting opening part through which the case is inserted into the reproducing apparatus, a turntable for rotating the disc-shaped recording medium, and a clamping mechanism for clamping at least one of the disc-shaped recording medium or the lid member provided at the innermost part on the opposite side from the inserting opening part with respect to the turntable.

Abstract: A reproducing apparatus reproducing a disc-shaped recording medium which is accommodated within a case. The case comprises a jacket which has a space for accommodating the disc-shaped recording medium and an opening for allowing the disc-shaped recording medium to go in and out of the jacket, and a lid member inserted through the opening of the jacket for closing the opening of the jacket, the reproducing apparatus comprises a holding mechanism for holding and leaving the disc-shaped recording medium inside the reproducing apparatus when the case is inserted into and then pulled out from within the reproducing apparatus in a direction opposite to the direction of the insertion and a clamping mechanism for clamping the disc-shaped recording medium on a turntable.

Abstract: A case for a disc-shaped recording medium is used in a disc-shaped recording medium reproducing apparatus provided with an insertion opening through which the case is inserted, a turntable for rotating the disc-shaped recording medium, a lid plate locking member and a disc-shaped recording medium clamping member provided at the innermost part of the disc-shaped recording medium reproducing apparatus opposite to the inserting opening with respect to the turntable, and a jacket opening enlarging member provided in the vicinity of the insertion opening, capable of moving between the position in the vicinity of the insertion opening and the innermost part of the disc-shaped recording medium reproducing apparatus above the turntable. The case comprises a jacket having a space for accommodating the disc-shaped recording medium and an opening for allowing the disc-shaped recording medium to go in and out of the jacket, and a lid plate inserted through the opening of the jacket for closing the opening of the jacket.

Abstract: A reproducing apparatus reproduces a disc-shaped recording medium which is accommodated within a case. The case comprises a jacket which has a space for accommodating the disc-shaped recording medium and an opening for allowing the disc-shaped recording medium to go in and out of the jacket, and a lid member inserted through the opening of the jacket for closing the opening of the jacket.

Abstract: A reproducing apparatus reproduces a disc-shaped recording medium which is accommodated within a case comprising jacket which has a space for accommodating the disc-shaped recording medium and an opening for allowing the disc-shaped recording medium to go in and out of the jacket, and a lid plate inserted through the opening of the jacket for closing the opening of the jacket. The reproducing apparatus comprises an inserting opening through which the case is inserted a lid plate locking mechanism and disc-shaped recording medium clamping mechanism respectively provided at the innermost part of the reproducing apparatus opposite to the inserting opening with respect to a turntable, for rotating the disc-shaped recording medium, and a jacket opening enlarging mechanism provided in the vicinity of the inserting opening, capable of moving over the turntable between the position in the vicinity of the inserting opening and the innermost part of the reproducing apparatus.

Abstract: The disc reproducing apparatus of the invention comprises low- and high-speed belt drive mechanism for playback and forward/backward operations. The latter comprises speed change means which in response to the operation of a feed-forward or a feed-backward button reduces its speed to a medium speed level suitable for searching a desired portion of the record grooves. A carriage on which a pickup arm with a needle is mounted includes a means for selectively seizing the low- and high-speed belts so as to be driven at the low or high speed relative to the turntable. A loop-and-finger arrangement is included to serve as a means for moving the pickup needle between upper and lower positions at a variable speed in response to the selective operation of the belt catch means.

Abstract: An ozone generating apparatus comprises a rectangular waveform current feeding device for feeding rectangular waveform alternating current between discharge electrodes of a discharge tube of an ozone generator so that a constant current is fed by the rectangular waveform current feeding device during a half cycle period to the ozone generator which is equivalent to a capacitor. Accordingly, the voltage applied to the ozone generator has a waveform which changes in proportion to the time period. Such a voltage waveform is ideal for the ozone generator to improve the conventional ozone generating apparatus.

Abstract: Audio/video disc playback apparatus includes a housing, a cover hinged to the housing, a rotor disc mounted in the housing and driven by a motor, and a pressure disc rotatably mounted underside of the cover for providing pressure contact with the rotor disc by the weight of the cover with an audio/video disc held therebetween. The pressure disc is loosely coupled to a mounting attached to the cover by means of a suspension which permits it to disengage from the mounting when the pressure disc comes to contact with the rotor disc as the cover is brought to the closed position so that the pressure disc is self-aligned to the axis of the rotor disc.