Diamond-shaped mask for making multiple exposure holograms

Details Diamond-shaped mask for making multiple exposure holograms Diamond-shaped mask for making multiple exposure holograms

1988-03-14

1990-05-08

Dees, Jose

Radiation imagery chemistry: process, composition, or product th

Holographic process, composition, or product

430 2, 430394, 350 367, 350 375, 350 381, 350 383, 350 385, 340705, 353 14, G03H 104, B60Q 100

Patent

active

049237713

ABSTRACT:
A method and apparatus for forming a multiple exposure hologram includes an object beam cut out mask 24 and reference beam cut out mask 60. Different segments of the masks are left uncovered during each exposure step and operate to shape the reference 18 and object 16 beams so that they illuminate selected areas of the photosensitive plate 12. The angle of incidence of the object beam 16 remains constant during each exposure step while the reference beam 18 illuminates the plate 12 at different angles during each exposure step. During playback, a plurality of lamps 94-106 project reconstruction beams at the hologram 12 to individually or collectively render the holographic segments viewable with a minimum of crosstalk between each segment. In the preferred embodiment, the reference beam mask includes diamond-shaped cut outs 62-74 which are selectively used with associated object beam mask cut outs 28-40 to generate a hologram in the form of a seven-segment display.

REFERENCES:
patent: 4018503 (1977-04-01), Silverman et al.
patent: 4094011 (1978-06-01), Nagao
patent: 4451114 (1984-05-01), Nicholson et al.
patent: 4547037 (1985-10-01), Case
patent: 4795223 (1989-01-01), Moss

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