Abstract: A reversible thermosensitive recording medium is disclosed which includes an opaque support and a transparent recording film having a thermosensitive layer capable of reversibly assuming a maximum transparent state and a maximum opaque state depending upon the thermal hysteresis thereof. The recording film has an image display section in which a void space is provided between the recording film and the opaque support and a color discriminative from the color of the support. The display section in the maximum transparent state shows a reflectance greater by 5% than that in the maximum opaque state and a transmittance of 20-80% in the maximum transparent state, so that the visibility of the recorded image is improved.

Abstract: An image recording method for recording information in and erasing recorded information from a display medium which contains a reversible thermosensitive recording material capable of writing information therein and erasing recorded information therefrom by the application of heat thereto, by using a heat application member with round corners, and contacting the surface of the heat application member with the display medium.

Abstract: An image recording method of recording information in and erasing recorded information from a display medium which contains a reversible thermosensitive recording material capable of writing information therein and erasing recorded information therefrom by the application of heat thereto, by use of a heat application member with a flat portion by bringing the flat portion into contact with the display medium provided on a supporting base, at least one of the display medium or the flat portion of the heat application member having an elastically deformable portion through which one of the display medium or the flat portion of the heat application member performs elastic deformation and the display medium is capable of coming into close contact with the heat application member.

Abstract: A method of compensating for the distortion in a recording layer of a reversible thermosensitive recording medium, for which transparency of the recording layer is changeable, depending upon the temperature thereof, and the recording layer is capable of forming images and erasing the images reversibly. The distortion in the recording layer is caused by the repeated image formation by image formation means and/or image erasure by image erasing means. In this method, stress is applied to the recording layer before and/or after image formation by the movement of the recording medium relative to the image formation means, in a direction different from the direction of the application of stress in the course of a previous image formation or image erasure. Instead of the stress, thermal energy can be employed for compensating for the distortion in the recording layer.

Abstract: A reversible thermosensitive recording material is composed of a support and a reversible thermosensitive recording layer formed thereon. The reversible thermosensitive recording layer is composed of a matrix resin, such as polyvinyl chloride or vinyl chloride copolymer, and an organic low-molecular-weight material dispersed in the form of finely-divided particles in the matrix resin, with the weight percentage Y of the vinyl chloride repeat in the matrix resin and the average polymerization degree X of the matrix resin satisfying the relationship:-0.68 log X+3.794.ltoreq.log Y.ltoreq.-0.215 log X+2.66.

Abstract: A reversible thermosensitive recording material composed of a support, an undercoat layer formed on the support, and a reversible thermosensitive recording layer formed on the undercoat layer, capable of reversibly assuming a transparent state and a white opaque state depending on the temperature thereof, the undercoat layer having at least one colored portion and at least one light reflecting portion.

Abstract: An electrophotographic photoconductor is formed of a metallic base drum and a photoconductive layer formed thereon. The base drum is an electroseamed tube prepared by high-frequency welding of a tubular metallic plate or strip. The electroseamed tube may be subjected to extruding or drawing, straightness improving by use of correcting rollers, or machining, grinding, abrasion finish, electro-polishing or anodizing for treatment of its surface.

Abstract: The present invention relates to an apparatus for conveying and rotating an image-forming belt while supporting said belt by at least two rolls, wherein the surface of at least one roll A of said rolls is short-fibre-embedded or wound up with thread or cloth. It is desirable to provide a meander-preventing guide at the side-end portions of said image-forming belt. In this case, it is desirable to attach a plastic-made washer to at least one side-end of said roll A so as to abut on said guide.

Abstract: An improved electrophotographic photoconductor is disclosed, which comprises a cylindrical electroconductive support and a photoconductive layer formed on the electroconductive support, which electroconductive support comprises a base support made of a phenol resin with the releasing rate of ammonia therefrom per 48 hours being 50 ppm or less.

Abstract: An endless belt shaped electrophotographic photoconductor is disclosed, which comprises an electroconductive support material, a photoconductive layer formed thereon, a joint portion by which the electrophotographic photoconductor is worked into the shape of an endless belt, and a grounding electrode which is electrically connected to the electroconductive support material, the joint portion comprising an electroconductive overcoating layer by which the photoconductive layer in the joint portion is covered, the electroconductive overcoating layer comprising a polymeric material having a glass transition of -10.degree. C. or lower and finely-divided electroconductive particles, or the joint portion further comprising a joint reinforcement resin layer which is formed so as to be inserted between the electroconductive overcoating layer and the photoconductive layer in the joint portion.