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US 5,309,270 AGranted
Optical scanning system
AssigneeFuji Photo Optical Co., Ltd.
InventorHiromitsu Yamakawa
Life of this patent
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AssigneeFuji Photo Optical Co., Ltd.
InventorHiromitsu Yamakawa
Estimating the term…
An optical scanning system for use in a laser printer, including a first light receiving section for controlling a scan timing and a second light receiving section for controlling the amount of scanning beam. The first light receiving section is composed of two light receiving elements, wherein they are disposed remote from each other at outsides external to both ends of an effective scan field. The second light receiving section is a single light receiving element disposed in close proximity to either of the first light receiving elements in the same scan plane. In the system, there is further provided a laser beam splitter between a light source and the combination of the first light receiving element and the second light receiving element for diffracting the laser beam into the 0th order light and the +1st order light, the former entering the first light receiving element whilst the latter entering the second light receiving element.
An optical scanning system wherein the optical scanning across an image plane is effected by the deflection of a light beam by means of a light deflector, and wherein a scan timing is detected by either of two light receiving means and the quantity of scanning light is detected by the other of the two light receiving means, theses two light receiving means being disposed in the scan direction at one side external to an effective scan field which is defined within the image plane, wherein the improvement comprises:
An optical scanning system wherein the optical scanning over a target surface is effected by the deflection of a light beam by means of a light deflector, and wherein a scan timing is detected by at least two first-type light receiving means and the quantity of scanning light is detected by a second type light receiving means, the first type light receiving means being disposed in the scan direction on both sides external to an effective scan field defined within the image plane, and the second-type light receiving means disposed on either of the sides external to the effective scanning field, wherein the improvement comprises:
Dependencies are inferred from the claim text.