Method and apparatus for producing an image from a transparent o

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350202, 350299, G02B 508, G02B 518

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040350622

ABSTRACT:
The contrast produced from a photographic transparency is controlled by placing the transparency between a pair of partially reflecting mirrors forming walls of an optical cavity. Mirrors are used to trap a collimated laser beam illuminating the transparency so that at least a portion of the beam energy is passed through the transparency plural times. The distance that the light beam travels between the mirrors is controlled as a function of the wavelength of the beam energy to control the phase of light interference in the beam passing through the transparency, thereby controlling the intensity of the beam derived from the mirror downstream of the transparency. The contrast of the transparency is increased or decreased, depending upon whether constructive or destructive interference for the beam energy is provided by the mirror spacing. For a negative input transparency a low to high contrast projected negative or positive image can be obtained.

REFERENCES:
patent: 3424512 (1969-01-01), Ingalls
patent: 3432239 (1969-03-01), Holland
patent: 3516727 (1970-06-01), Hickey et al.
patent: 3531204 (1970-09-01), Holland et al.
patent: 3586444 (1971-06-01), Sproul et al.
patent: 3598471 (1971-08-01), Baldwin et al.
patent: 3749475 (1973-07-01), Shupe
patent: 3778635 (1973-12-01), Giuliani
patent: 3915573 (1975-10-01), Knoll et al.
"Mathematical Operations by Optical Processing," Lee, Optical Engineering, vol. 13, No. 3, May/June, 1974, pp. 196-207.

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