Experimental holographic movie IV: the projection-type display system using a retro-directive screen

Holographic movies can be seen as a tool to estimate the picture quality of moving holographic images as a step towards holographic television. The authors have previously developed three versions of an experimental holographic movie system, and this paper is a report on an improved version 4 of the system. The new version features a newly-developed projection-type display with a retro-directive beaded-screen, and an automatic film driver unit which moves perforated 35 mm holographic film intermittently with a shutter. A twin diamond-shaped hologram format, which was developed in the earlier version 2, is adopted for the films. The films comprise a series of reconstructed moving holographic images with minimal blurring. The optical arrangement and structure of the version 4 system enable the viewers to watch the film images in an open space, which in turn relieves them of the psychological pressure they felt with the previous three versions, when they had to squint into a narrow window built into a wall on the side of the device.