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A known type of holographic scanner employs a rotating glass disc which carries a hologram recording material in the form of a photopolymer or light-sensitive gelatin.
English (United States)
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Flexible Holographic Disc For Laser Scanner
A known type of holographic scanner employs a rotating glass disc which
carries a hologram recording material in the form of a photopolymer or light-
To reduce the cost of the scanner, the rigid glass disc may be replaced with a
flexible disc 10 carrying a track 12 of individual holographic material facets or
holofacets 14 on its surface. Technology previously developed for flexible
magnetic recording medium can be used to mount and drive the flexible
holographic disc. Techniques are already known for automatically and uniformly
coating flexible substrates with holographic photopolymer material using optical
In one application, a laser beam 16 provided by a source 18 is directed along
an optical path including a stationary mirror 20. The mirror 20 directs the laser
beam through the track 12. The movement of the holofacets 14 with respect to
the beam 16 causes the transmitted beam 22 to scan along a predetermined line,
such as line 24. By using holofacets having different characteristics, an area 26
can be covered by a multiline scan pattern.
While the illustrated scanner shows the laser beam being transmitted through
the rotating disc, an opaque disc might be used in which the laser beam would
be reflected from the surface of the disc.
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