Production of optical reading hologram

Abstract

Abstract PURPOSE: To achieve the improvement in the performances of holograms, reduce read errors, etc. and improve the realiability of the apparatus by changing the exposure to scanning holograms and condensing holograms. CONSTITUTION: Photosensitive material is coated on a substrate 4 for holograms and a hologram region 5 for scanning the target by laser light and hologram regions 6 for condensing the reflected light from the target are formed thereon. In this case, the region 5 is exposed under the conditions where the exposure is in the range (a) by using a mask having a light transmission window 7 and a light-blocking part 8, thence the regions 6 are exposed under the conditions where the exposure is in the range (b) by using a mask having light transmission windows 9 and a light blocking part 10. As a result of this, the region 5 becomes high in diffraction efficiency and is improved of S/N and the regions 6 become high in diffraction efficiency and have less differences depending upon places, thus the performances of the holograms improve. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Seikichi Matsumoto
• 👤 Hiroyuki Ikeda

Bibliographic Details