G - Physics – 03 – B
Patent
G - Physics
03
B
88/73
G03B 21/11 (2006.01)
Patent
CA 1079553
ABSTRACT OF THE DISCLOSURE A microfiche reader according to the present invention includes a housing consisting of a hood portion and a base por- tion, a screen located within the hood portion and visible through the front end of the hood, a combined microfiche carriage and index holder, a lens assembly and a projection system. The com- bined microfiche carriage and index holder serves to accurately locate the microfiche with respect to the index grid. By reason of the fact that there is no relative movement between the index grid and the microfiche in use, it is always possible to accurately locate the microfiche with respect to the projection system by reference to the index grid. The index grid is illuminated by an index illuminating carried by the housing. The illuminating lens is located in a fixed relationship with respect to the pro- jection path which again contributes to the facility with which the microfiche may be accurately located in the projection path. The lens assembly includes a support plate mounted above the microfiche carriage and a slide member mounted in the support plate and a pair of lens members mounted in the above members so that either one may be located in the projection path as re- quired. The projection system includes a demountable modular unit which may be easily mounted in and removed from the housing. A prefocussed lamp is mounted on the modular unit and the position of the prefocussed lamp with respect to the modular unit may be adjusted so as to vary the length of the illuminating path between the prefocussed lamp and the condenser means whereby the optical system may be adjusted to accommodate objective lenses having different characteristics. The projection system consists of a profocussed lamp which projects a beam of light onto a cold mirror which reflects the beam of light through an optical con- denser which in turn directs the beam of light through the micro- fiche to an objective lens mounted thereabove. A first surface mirror is mounted in the housing and reflects the beam of light emitted from the objective lens to a viewing screen mounted in the housing. The viewing screen consists of a unitary body of molded plastics material having an image receiving surface formed with a concave spherical curvature. The image receiving surface may be plated with a suitable coating to form an image reflecting coating thereon.
268032
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