Abstract: A photographic film like a microfilm is maintained on a focal plane by suction. A film support having a vacuum suction holes is made of a drafty material to allow draft while the film is maintained flat on the surface thereof by suction. Further, the film support has cushion to protect the film from scratches. Thus, the film can be fed on while being kept flat on a focal plane on the film support.

Abstract: A light beam scanning system in which the vibration of a rotating multi-face mirror and a high-speed motor which constitute the light beam scanning means of the system is prevented from being transmitted to other optical components of the system by mounting the rotating multi-face mirror and the high-speed motor on the optical component mounting board through the medium of vibration isolators.

Abstract: A device for feeding a web like a microfilm by use of rubber rollers has a stepping motor for driving the rubber roller. The stepping motor is controlled by a pulse generator. A temperature detector is provided for measuring the temperature of the rubber roller or any part of the device having a temperature substantially equal to the rubber roller. The output of the temperature detector is sent to the pulse generator for controlling the stepping motor according to the measured temperature. When the temperature is raised, the stepping motor is controlled to reduce the speed of rotation and the increase in feeding speed due to expansion of the rubber roller is compensated, thereby feeding the web at a constant speed irrespective of the temperature fluctuation.

Abstract: A laser COM device in which a platen securing a film strip to a base plot may be moved between two mutually perpendicular positions to orient the delivery direction of the film strip parallel to either a main or auxiliary scanning direction. The platen is mounted over an aperture in the base plate at the other side of which is disposed a laser scanner. In one embodiment the aperture is round, and a cylindrical sleeve extends from the platen into the aperture. A slot in the base plate and a mating protrusion extending from the platen prevent rotation. In another embodiment, the aperture is square with a mating square sleeve extending from the platen.

Abstract: Microfilm carried by a microfilm carrier is moved in a horizontal plane so that a selected area of the microfilm is presented to a film aperture of a microform printing system. The microfilm carrier includes a sliding spacer fixed thereto sliding along a base plate in which the film aperture is formed. The sliding spacer maintains a predetermined distance between the carrier and the base plate during movement of the carrier.

Abstract: An improved method and apparatus for removing the scanning error due to imperfect parallelism of a rotary polyhedral mirror is disclosed. An incident beam of light initially deflected by the rotary polyhedral mirror is directed along an optical path which brings it back into incidence on the same deflection point on the mirror. The double deflection causes the second reflected beam to travel a path which is vertically independent of the error in parallelism, while at the same time not interfering with the horizontal scanning of the second reflected beam.

Abstract: In a laser beam scanning system for recording information on a recording material employing a rotating mirror, a photodetector is provided to receive a laser beam in the start position of rasters. The photodetector supplies a synchronizing signal for making a synchronization between the laser beam scanning and a video signal supplied to a light modulator to modulate the laser beam. The frequency of base clock pulses is several times as large as that of the video clock pulses, whereby the start positions of the effective rasters on the recording material are aligned with each other.

Abstract: A rotary polygonal mirror is used to horizontally deflect a laser beam emitted by a laser source. A cylindrical lens is provided between the laser source and the rotary polygonal mirror for vertically converging the laser beam to form a horizontally extending light spot on the face of the rotary mirror. The beam reflected by the face of the mirror is vertically collimated and horizontally converged by a convergent lens to form a vertically extending light spot on an elemental hologram plate. By the hologram plate, the beam is vertically converged. Behind the hologram plate is located another cylindrical lens for horizontally converging the beam. By the vertical convergence effect of the elemental hologram plate and the horizontal convergence effect of the second cylindrical lens, the laser beam incident to the elemental hologram plate is converged to a minute light spot on a focusing plane. A microfilm is located on the focusing plane and the laser beam scans the microfilm to record information thereon.

Abstract: A method and apparatus for deflecting a light beam having high resolution, good linearity with time and high frequency response. For deflecting a light beam, after a monochromatic light beam is applied to a light deflection unit driven by a sinusoidal AC voltage so as to carry out light deflection, the deflected monochromatic light beam is scanned on a deflection angle correction plate which comprises elemental holograms formed by a multiple-beam hologram production technique. Thereafter, the light beam passing through the deflection angle correction plate is focused on a light receiving surface to perform a uniform scanning thereon.