Abstract: A fluorescent printer head capable of rendering luminance of dot-like anodes along its main scanning direction uniform and stable to improve quality of printing in an optical printer. The fluorescent printer head includes dot-like anodes constituting a luminous area, control electrodes having apertures formed at positions corresponding to the dot-like anodes, and at least one filamentary cathode stretched above the control electrode extending along the middle portion of the luminous area.

Abstract: A fluorescent printer head includes a second control electrode (4) including a plurality of grid plates (5) formed with slits (6) and arranged in parallel above anodes (104), and a first control electrode (1) comprising a single plate member formed with a plurality of slits (3) and arranged above the second control electrode (4). The second control electrode (4) has a dummy grid plate (7) at each end, while the first control electrode (1) has a contiguous dummy grid section (2) at each end. This results in the electric field near the control electrodes being uniform in the longitudinal direction of anodes, preventing nonuniformity of luminance.

Abstract: A write device for an optical printer capable of determining intervals between luminous dots and inclination and dimensions of the luminous dots with high precision to improve printing quality of a printer. The write head includes luminous dots defined on each of a plurality rows of anodes. The luminous dots arranged obliquely across the row of the anodes are driven to emit lights which are uninterruptedly linearly irradiated together in a direction perpendicular to a direction of movement of a record medium on a surface of a record medium. The write head also includes an electro-optical shutter which is arranged in front of the obliquely arranged luminous dots and adapted to be varied in optical characteristics in synchronism with an emission driving signal supplied to the anodes to selectively shield or transmit light emitted from each of the luminous dots.

Abstract: An optical write head for an electrostatic dot-matrix image printing system which includes a plurality of controlled light emission element row-arrays positioned parallel and spaced in the direction perpendicular to the row-wise direction a distance equal to an integer multiple of the desired dot image-pitch S measured in the perpendicular direction, corrected by the fraction S/N where N is the number of row-arrays. A timed electrode drive circuit activates the arrays sequentially, and grid mask elements extending transversely across the row-arrays control emission from the individual light emission elements in an activated array, to minimize the number of drive circuit switching elements. A series-to-parallel signal conversion and storage circuit preprocesses the recording signal of the image to be printed.

Abstract: A write head for an optical printer using a vacuum fluorescent tube. The write head includes strip like anodes 12 having a phosphor layer 16, control electrodes 14 having slits 15 formed obliquely across the anodes and a first plate-like control electrode 19 having slits 20 formed at positions corresponding to the slits 15 of the second control electrodes 14.

Abstract: An optical write device is disclosed which is capable of being driven according to a dynamic drive system. The device uses, as an optical printer head, a vacuum fluorescent tube which includes a plurality of stripe-like anode conductors arranged on a substrate, a plurality of control electrodes formed with slits extending obliquely across the anode conductors and phosphor layers deposited on the anode conductors and defined by the slits to form luminous dots. The device is adapted to successively scan the anode conductors in a such manner that one scanning of the anode conductors is completed while a photosensitive drum is moved by a distance corresponding to a height of the luminous dot.

Abstract: A graphic fluorescent display device is disclosed which is capable of effectively eliminating a streak pattern occurring right below cathodes. The fluorescent display device is constructed in such a manner that an electric field controlling electrode is disposed on the surface of a cover plate opposite to a substrate having anodes formed thereon, and potential positive with respect to the cathodes is applied to the electric field controlling electrode so that electrons emitted from the cathodes may be diffused by the positive electric field of the electric field controlling electrode.

Abstract: A recording and/or reproducing apparatus, such as a video tape recorder, comprises a drum having a peripheral surface on which a magnetic tape can be wrapped, and at least one head for recording signals on, reproducing signals from, the magnetic tape by helically scanning it. Grooves are formed in the peripheral surface of the drum to inhibit formation of a thin layer of water between the surface of the drum and the magnetic tape. The lengths of the grooves are substantially parallel to the direction of transport of the magnetic tape and each groove includes a wall portion disposed at an angle greater than 3 degrees to a line joining the crests of the grooves and normal to the direction of transport of the magnetic tape.