Optical: systems and elements – Holographic system or element – Using modulated or plural reference beams
Patent
1991-02-11
1992-09-29
Arnold, Bruce Y.
Optical: systems and elements
Holographic system or element
Using modulated or plural reference beams
359 26, 359 30, G03H 114, G03H 130
Patent
active
051517990
ABSTRACT:
A fast, accurate system for manufacturing holographic projection screens. The invention (10) includes a mechanism (28) for moving holographic film (26) along a longitudinal axis thereof in a first direction. A mechanism (12) is provided for directing and maintaining an input beam (22) onto the film (26) as the film (26) is moved. The application of a reference beam (23) is then effective to create an interference pattern on the film (26) with the input beam (22). The mechanism (12) for maintaining the input image at a fixed location on the film includes a polygon shaped mirror mounted to rotate at a rate determined in accordance with the rate of movement of the film. An image stabilization system (40) is also provided which includes a detector (58) for monitoring an interference pattern created by the signal beam and the reference beam. Circuitry (60) is included for providing control signals in response to the detector (58) outputs. A phase shifter (44) induces a phase shift in the reference beam. A phase shifter positioning mechanism (46) adjusts the phase shifter (44) in response to the control signals so that the image is stabilized on the film (26) despite the movement thereof.
REFERENCES:
patent: 3539242 (1970-11-01), Burch et al.
patent: 3558207 (1971-01-01), Worthington, Jr.
patent: 3572882 (1971-03-01), Neumann
patent: 3622794 (1971-11-01), Pond et al.
patent: 3632214 (1972-01-01), Chang et al.
patent: 3636838 (1972-01-01), Chang et al.
patent: 3659947 (1972-05-01), Neumann
patent: 3697149 (1972-10-01), Van Heeckeren et al.
patent: 3812496 (1974-05-01), Brooks
patent: 3838903 (1974-10-01), Leith et al.
patent: 3964032 (1976-06-01), Bardos
patent: 4212536 (1980-07-01), Bencze et al.
patent: 4500163 (1985-02-01), Burns et al.
Bardos et al., "Gigabit/Second Recording with Holography," Proceedings of the Technical Program, Electro-Optical Systems Design Conference, Sep. 18-20, 1973, New York, pp. 90 to 101.
Johnson et al, "Scophony Spatial Light Modulator," Optical Engineering, vol. 24, No. 1, Jan.-Feb. 1985, pp. 94 to 95.
Arnold Bruce Y.
Denson-Low Wanda K.
Hughes Aircraft Company
Lerner Martin
Sales Michael W.
LandOfFree
System and technique for making holographic projection screens does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and technique for making holographic projection screens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and technique for making holographic projection screens will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1972912