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Primary Examiner: Smith, Alfred E.
Assistant Examiner: DELOS Reyes, B. W.
Attorney: Hopgood, Calimafde, Kalil, Blaustein & Lieberman

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Title: Optical memory apparatus

Abstract: An optical memory includes a light beam source, converting means for causing the light beam to take on a predetermined spot size, and a light-focusing fiber guide having a refractive index distribution decreasing radially outwardly from its center axis. A memory medium is arranged to be irradiated by an output beam from the fiber guide. The fiber guide has input and output end faces perpendicular to the direction from which the light beam irradiates the surface of the memory medium. The length of the fiber guide is equal to an integral multiple and a half-integral multiple, respectively, of the characteristic propogation pitch of the fiber guide corresponding to conditions in which the directions of the input and output beams are anti-parallel and parallel.

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Inventors: Ono, Yuzo (Tokyo, JA)

Application Number: 533993
Filing Date: 1974-12-18
Publication_date: 1976-03-09
Assignee: Nippon Electric Co., Ltd. (Tokyo, JA)
Primary Class(es): 359/107 385/124, 385/147
Other Classes:
US Patent Ref:

3801181

Apr, 1974

Kitano et al.

350/96.

Other Refs: Other References: A. N. Rosen, Scanning a TEM Mode Laser Beam Through Selfoc Fibers Apr. 1972, pp. 946-947.
Applied Optics-Vol. 11, No. 4.
Aagard, Advance Optical Storage-Techniques for Computers, Oct. 1972, Vol. 11, No. 10 Applied Optics pp. 2133-2139.