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:
Jul. 19, 1994
Filed:
May. 01, 1992
Hirosi Ando, Aichi, JP;
Masayuki Goto, Kariya, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
A hologram plate manufacturing apparatus comprising a copying optical element disposed in opposed relation to a photosensitive surface of a hologram plate. The copying optical element is arranged so that its one surface facing the photosensitive surface of the hologram plate has a plane configuration and its other surface has a convex or concave configuration. On the convex or concave surface there is formed a reflection film for effectively reflecting incident light. Also included a refraction index adjusting layer which is provided between the photosensitive surface of the hologram plate and the convex or concave surface of the copying optical element, the refraction index adjusting layer having an index of refraction substantially equal to indexes of refraction of the hologram plate and the copying optical element. Further, a prism is disposed in opposed relation to the incident surface of the hologram plate and arranged such that light incident on the incident surface of the hologram plate and reflected on the reflection film is not re-reflected on the incident surface of the hologram plate so as not to be directed toward the hologram plate. This arrangement can suppress generation of noise images due to unnecessary reflection.