Patents by Inventor Nobuo Banba

Nobuo Banba has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Hologram disk for deflecting a light beam
    Patent number: 4712852
    Abstract: A hologram disk for deflecting a light beam in a hologram scanner includes a plurality of straight-line gratings formed by holograms in an annular pattern for deflecting the light beam. The line-to-line distance d.theta. between adjacent lines of each of said straight-line gratings is determined to meet, at least approximately, the following equation when said each straight-line grating is rotated through an angle .theta.R: ##EQU1## where .lambda. is the wavelength of the light beam and .alpha. is a proportionality constant. Therefore, the angle .theta.s through which the light beam is deflected is expressed by .theta.s=.alpha..multidot..theta.R.
    Type: Grant
    Filed: June 3, 1986
    Date of Patent: December 15, 1987
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroyoshi Funato, Nobuo Banba