Patents by Inventor Tomoaki Ishituka

Tomoaki Ishituka 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).

  • Optical reading apparatus for reading latent image mark
    Patent number: 5668363
    Abstract: A high-reliability optical reading apparatus for reading a latent image mark capable of accurately reading the code information of a latent image mark. The optical reading apparatus comprises a light-projecting light member for projecting on a surface of the latent image mark, the light having a wavelength to excite a fluorescent substance contained in the latent image mark having desired information; and a light-receiving member for receiving fluorescence emitted from the surface of the latent image mark. A range in which the latent image mark can be read is formed by setting a point at which the optical axis of the light-projecting member and that of the light-receiving member intersect with each other as a reference. An intersection angle between the two optical axes is preferably in the range of from 10.degree. to 40.degree..
    Type: Grant
    Filed: January 17, 1995
    Date of Patent: September 16, 1997
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Masato Nishida, Tomoaki Ishituka, Toshio Oshima