| 摘要 |
PURPOSE:To describe a stereoscopic picture of wide visual field by adding a mask having plural holes to a hologram head and making coherent parallel rays incident on the mask and changing the pitch of interference fringes formed with the light which passes a light pass part to expose them on a photosensitive material. CONSTITUTION:When coherent parallel rays 31 are made incident on a mask 33, the light which passes a hole 32 of the mask is diffracted by a hologram head 34 and a diffracted light 35 is led to a minute area 36, and the spot 36 is projected on a photosensitive material 37 to record interference fringes. The diffracted light 35 is condensed on the minute area 36 and its pattern is not changed wherever the hole 32 exists on the mask 33 and whichever shape the hole 32 has. An interval between holes 32 is changed to change the space frequency of a grating generated on the photosensitive material 37, that is, interference fringes are successively exposed on the photosensitive material while changing the pitch. Thus, as colorful stereoscopic image of wide visual field is described.
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