The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 1988
Filed:
May. 06, 1986
Nobuyuki Baba, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A method of recording a hologram on a recording medium composed of a substrate and a recording material coated as a thin layer on the substrate, the recording medium being transparent or semitransparent with respect to light to which the recording medium is exposed. A value B, B/A, B/Bo, A/B, or Bo/B is established where A is the intensity of the light at a surface of the recording medium, B is the intensity of the light that has passed through the recording medium, and Bo is the intensity of the light that has passed through the recording medium immediately after the recording medium has started to be exposed to the light. The recording medium is exposed to the light until the established value is equalized to a preset value. The exposure of the recording medium is stopped when the established value is equalized to the preset value.