Coherent light generators – Particular component circuitry – Optical pumping
Patent
1986-03-05
1989-05-30
LaRoche, Eugene R.
Coherent light generators
Particular component circuitry
Optical pumping
372 9, 372 24, 372 34, 372 38, 372 29, 350 61, 350 65, 350 67, G02B 2608, H01S 310, H01S 304
Patent
active
048344770
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND ART
There are known optical scanning devices in which an image can be recorded or read by being scanned with a laser beam. As one of such optical scanning devices, there has been proposed a device employing a semiconductor laser as a light source and a holographic scanner for deflecting a laser beam emitted from the semiconductor laser (see Japanese patent application No. 59-28066, for example).
The optical scanning device of the above type and problems to be solved by the present invention will be described below with reference to FIG. 1.
FIG. 1 shows an image recorder employing an optical scanning device in which a laser beam emitted from a semiconductor laser is deflected by a holographic scanner.
The image recorder includes a semiconductor laser 10, a collimator lens 12, a cylindrical lens 14, plane mirrors 16, 18, 22, a holographic scanner 20, an f.theta. lens 24, plane mirrors 26, 28, a cylindrical lens 30, a photoconductive photosensitive member 32, and light detectors 34, 36.
Actually, the present invention is embodied in the image recorder shown in FIG. 1. A device similar to the image recorder of FIG. 1, but which lacks the light detector 36, suffers the problems to be solved by the invention. Therefore, insofar as the problems are addressed, the presence of the light detector 36 in FIG. 1 is neglected.
The holographic scanner 20 comprises a hologram disc 20A and a motor 20B. The hologram disc 20A is fixed to the shaft of the motor 20B and driven by the motor 20B to rotate in the direction of the arrow.
A plurality of identically shaped diffraction gratings 200 are arranged in an annular pattern on one surface of a transparent circular base plate of the hologram disc 20A.
The diffraction gratings 200 are linear diffraction gratings and optically equivalent to each other, the diffraction gratings 200 being formed as holograms. The terms "hologram disc" and "holographic scanner" are derived from the fact that the diffraction gratings 200 are formed as holograms.
A laser beam emanating from the semiconductor laser 10 is converted by the collimator lens 12 into a parallel-ray beam, which is passed through the cylindrical lens 14 and reflected by the plane mirrors 16, 18 to fall on the diffraction gratings 200 of the hologram disc 20A, thereby producing a diffraction beam. As the hologram disc 20A rotates, the diffraction beam is deflected since the direction of each of the diffraction gratings 200 varies with respect to the incident laser beam. The diffraction beam as deflected is referred to as a "deflected laser beam".
The diffraction beam is then guided by the plane mirror 22, the f.theta. lens 24, the plane mirrors 26, 28, and the cylindrical lens 30 to reach the photosensitive member 32 which is in the form of a belt. The diffraction beam is focused as a spot on the photosensitive member 32 by the focusing action of the f.theta. lens 24 and the cylindrical lenses 14, 30. Upon rotation of the hologram disc 20A, the spot formed on the photosensitive member 32 by the deflected laser beam is linearly displaced on the photosensitive member 32. The spot is cyclically displaced to repeat an optical scanning process each time the laser beam falls on a different diffraction grating. The spot as it scans the photosensitive member follows a straight path 38, which is referred to as a main scanning line. A direction normal to the main scanning line on the photosensitive member 32 is referred to as an auxiliary scanning direction.
The photosensitive member 32 is continuously moved. After the peripheral surface of the photosensitive member 32 has been uniformly charged, it goes to an optical scanning zone in which it is scanned by the deflected laser beam. If the intensity of the laser beam emitted from the semiconductor laser 10 is modified by an image signal representative of an image to be recorded, an electrostatic latent image corresponding to the image to be recorded is formed on the photosensitive member 32. By developing the electrostatic latent image into a visible image, transferring the
REFERENCES:
patent: 4205350 (1980-05-01), Gunning
patent: 4338577 (1982-07-01), Sato et al.
patent: 4485475 (1984-11-01), Large et al.
patent: 4505537 (1985-03-01), Funato
patent: 4513422 (1985-04-01), Buholz
Webster's Ninth New Collegiate Dictionary, Copyright 1986, p. 319.
Imakawa Susumu
Tomita Satoru
LaRoche Eugene R.
Ricoh & Company, Ltd.
Shingleton Michael
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