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US 4,050,780 AGranted
Optical system for a scanning apparatus with reflector pairs at each end
AssigneeNorthern Telecom Limited
InventorsJohn Shi Sun Wei, William Dickson Westwood
Life of this patent
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Abstract
An optical system for a scanning apparatus uses a folded optical path with certain mirrors moving, the movement of the mirrors such that the length of the optical path, and thus the magnification, is maintained constant. Either a fixed or movable lens system can be provided. With a fixed lens system there is differential movement of mirrors. With a moving lens system, the lens system and image receiver move in fixed relationship with the scanning mirror.
Claims9
An optical system for a scanning apparatus, comprising;
- an elongated housing;
- a first mirror mounted in said housing for reciprocal movement therein for scanning of material positioned on said housing;
- second and third mirrors mounted at one end of said housing, the second mirror optically aligned with said first mirror for reception of light rays therefrom and for reflection rays to said third mirror;
- fourth and fifth mirrors mounted at the other end of said housing, the fourth mirror optically aligned with the third mirror for reception of said rays therefrom and for reflection of said rays to the fifth mirror;
- a sixth mirror intermediate the ends of the housing and optically aligned with the fifth mirror for reception of said rays therefrom, the path of said rays from said sixth mirror extending to a lens system and then to an image receiver;
- the sixth mirror mounted for reciprocal movement in said housing at a predetermined speed relationship with said lamp and first mirror, to maintain constant the total optical path length from said first mirror to said lens system.
3 more elements
A scanning apparatus comprising:
- an elongate rectangular housing including a base, end walls and side walls, and a transparent top surface;
- means for illuminating material positioned on said transparent top surface;
- a first mirror mounted in said housing for reciprocal movement from one end wall to the other end wall for scanning of said material;
- second and third mirrors mounted at one end of said housing, the second mirror optically aligned with said first mirror for reception of light rays therefrom and for reflection of said rays to said third mirror;
- fourth and fifth mirrors mounted at the other end of said housing, the fourth mirror optically aligned with said third mirror for reception of said light rays therefrom and for reflection of said rays to said fifth mirror;
- a sixth mirror intermediate the ends of said housing and optically aligned with the fifth mirror for reception of said light rays therefrom;
- a lens system in said housing for reception of said light rays from said sixth mirror;
- and
- a semiconductor image receiving device optically aligned with said lens system;
- said sixth mirror mounted for reciprocal movement in said housing in the same direction as said first mirror and at a predetermined speed relationship with said first mirror, to maintain constant the total optical path length from said first mirror to said lens system.
7 more elements
Dependencies are inferred from the claim text.