摘要:
An optical scanning system wherein a light beam from a laser source is reflected by a rotating polygonal mirror and focused by a scanning lens into a scanning beam spot on the drum surface. A cylindrical lens disposed between the scanning lens and the drum for correcting the unevenness of the scanning line pitch caused by the incline of the each facet of the polygonal mirror has a curvature in the scanning direction of the beam so that optimal focal points of the scanning beam spot align on a straight line.
摘要:
An apparatus for driving a semiconductor laser for use in a laser-beam printer, in which a laser beam from the laser is deflected so as to scan a light-sensitive drum and a light-sensitive detector placed in the vicinity of one edge of the drum, comprises a first device for determining the operation level for the laser when it scans the drum to record information thereon, a second device for determining the operation level for the laser when it scans the detector to provide a scanning start pulse signal and a controller for controlling the first and second devices so that they are alternately enabled to determine the intensity of the laser beam depending upon whether the drum or the detector is scanned, whereby the intensity of the laser beam is allowed to be adjusted in accordance with the varying light-sensitivity of the drum without fluctuating the instant of generation of the scanning start pulse signal.
摘要:
In a laser beam scanner apparatus for scanning the surface of a photosensitive drum or a document to be read by deflecting a laser beam emitted from a laser diode with a deflector, there is provided a drive current control circuit for controlling the magnitude of drive current of said laser diode on the basis of a beam deflection angle of said deflector.
摘要:
In an interferometry wherein a light beam from a light source is divided in two, one of which is used as a reference beam and the other beam is used as an inspecting beam, and the two beams are projected again on an identical plane so as to form an interference pattern; a wavelength scanning type laser diode interferometry characterized in that a laser diode is employed as the light source, and that an injection current of the laser diode is modulated thereby to scan a wavelength of the laser diode and to change an intensity distribution of the interference pattern.
摘要:
An optical system provided with a single optical scanner for separating a plurality of laser beams from each other and for leading the separated laser beams to different recording materials to record information thereon is disclosed in which cylindrical lenses are provided in front of the recording materials in such a manner that a predetermined number of ones among the laser beams pass through the cylindrical lenses, respectively.
摘要:
In a laser beam recording apparatus comprising a laser source, an optical modulator for modulating the intensity of the laser beam from the laser source in response to an electrical signal, an optical scanner for deflecting the modulated laser beam, a recording medium on which the deflected laser beam is recorded, and a optical system for guiding the emitted laser beam from the laser source to recording medium, an automatic focusing device is provided for vibrating a lens or mirror in the optical system in synchronism with the scanning provided by the optical scanner, thereby converging the deflected laser beam into a small spot at any position on the recording medium.
摘要:
An optical system and a optical information processing equipment utilizing the same are disclosed. The optical system comprises a laser diode and a hologram lens has an interference fringe prepared by the interference of a beam having substantially the same intensity distribution and/or phase characteristic as that of a laser beam emitted from the laser diode with a beam having a desired characteristic. The laser beam from the laser diode is irradiated on the hologram lens so that its characteristic is converted into the desired characteristic.
摘要:
Herein disclosed is a system using a plurality of laser beams, in which the positions of the respective laser beams are detected as the differences between the outputs of detectors of an optical detector arrangement and controlled by the difference signals so that they may be held mutually precisely. This system finds its suitable application to an optical disk recording system or a laser beam printer.
摘要:
This invention is characterized in that a modified polarization prism or a modified half prism is used therein. Since photodetectors serving at the same time for light signal detection, for automatic focussing and for tracking are disposed at opposite sides of the optical source of a semiconductor laser, a single axis optical system can be realized and it is possible to reduce the optical head in size.
摘要:
A hologram apparatus comprises a rotary plane with a plurality of holograms concentrically or spirally arranged thereon, a light emitting source, and at least one photodetector for reading out reconstructed images of the holograms. During rotation of the rotary plane, the optical path of a light beam from the light emitting source is controlled, whereby the reconstructed images from the respective holograms are focused on the photodetector in succession. Some or all of the holograms are substantially oblong, and the long side and the short side of each oblong extend radially about the axis of the rotary plane and substantially orthogonally to the radial direction respectively.