Apparatus for deflecting light and scanning line conversion system

• US 3,951,509 A
• Filed: 04/16/1974
• Issued: 04/20/1976
• Est. Priority Date: 04/17/1973
• Status: Expired due to Term

• Current Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Noguchi, Masaru, Oosaka, Shigenori, Takahashi, Tsunehiko
• Primary Examiner(s): Corbin, John K.
• Assistant Examiner(s): Rosenberger, Richard A.
• Application Number:
  US05/461,328
• Time in Patent Office: 735 Days
• Field of Search: 350/6, 350/7, 350/285, 350/3.5
• US Class Current: 359/17
• CPC Class Codes: G02B 26/106 having diffraction gratings as scanning elements, e.g. holographic scanners holographic optical elements G02B5/32, holography G03H
• CPC Class Codes: G02B 26/125 Details of the optical system between the polygonal mirror and the image plane G02B26/123, G02B26/127 take precedence; F-Theta lenses G02B13/0005

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. An embodiment includes a scanning conversion system for converting a circular scanning line into a linear scanning line comprising a monochromatic light source, a light deflection member for circular-scanning a monochromatic light beam from the monochromatic light source, a deflection angle correction member for forming a deflection light beam through the circular-scanned light beam with this correction member comprising an arrangement of elemental holograms formed by a two-beam hologram production technique and a light receiving member for the diffracted light beam, in which the diffracted light beam from the deflection angle correction member is applied to the light receiving member to carry out uniform linear scanning.

Claims

1. A scanning line conversion system comprising

a monochromatic light source,

a light deflection member for circular-scanning a monochromatic light beam from said light source,

a deflection angle correction member for forming a desired diffracted light beam from the circular-scanned light beam, said correction member comprising an arrangement of two-beam elemental holograms, and a light receiving member for said diffracted light beam, said diffracted light beam from said deflection angle correction member being applied as a fixed-size spot to said light receiving member to carry out a uniform linear scanning thereon.

2. The scanning line conversion system as defined in claim 1 including means for modulating said monochromatic light beam by an image signal, whereby desired images are recorded on said light receiving member.

3. The scanning line conversion system as defined in claim 1, wherein said elemental holograms are circularly arranged on said deflection angle correction member.

4. The scanning line conversion system as defined in claim 1, including a light shielding member to pass said desired diffracted light beam and to block an undesired diffracted light beam, said shielding member being disposed between said deflection angle correction member and said light receiving member.