Optics: image projectors – Selective data retrieval
Patent
1984-08-03
1987-07-14
Haroian, Harry N.
Optics: image projectors
Selective data retrieval
353110, G03B 2306
Patent
active
046799222
ABSTRACT:
A high-density rapid random-access retrieval apparatus for retrieving micrographic and data images stored on plural windowed discs. The apparatus is comprised of a disc/radial selection mechanism which moves axially on a cartridge containing a stack of closely spaced discs. Each disc has a clear window disposed on a radius thereof and a plurality of windows containing micrographic and/or data images disposed along other radii. When the disc/radial selection mechanism has moved to a selected disc, the radial component rotates the disc until the radius upon which the desired image is located is aligned with the clear windows in the other discs. The optical system includes lens and reflecting surfaces. At one end of the system is a projection means and at the other end lies its image receiving means. Elements of the system are vertically adjustable so that the line of sight of the system is projected through any selected image bearing window. The optical system also includes a means for keeping all of the optical path lengths constant. The constant image-to-lens path length attained maintains the constant position and size of the primary aerial image regardless of the location of the image bearing window on the disc/radius. The distance between the light source and the selected image varies with the position of the disc in the cartridge, which variation changes the cross section of the source cone. In the disclosed system this distance remains constant and the cross section of the source cone remains constant whereby the brightness and eveness of illumination remains constant regardless of the position of the disc in the stack.
REFERENCES:
patent: 1215975 (1917-02-01), Palmer
patent: 3421802 (1969-01-01), Irazoqui
patent: 3743400 (1973-07-01), Haning
patent: 4132469 (1979-01-01), Harvey
Publication: Microfiche Image Storage Research Disclosure #214, pp. 54 & 55, 2/82.
Abbott Frank L.
Haroian Harry N.
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