Coaxial optical scanner

Details Coaxial optical scanner Coaxial optical scanner

1981-02-02

1982-08-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235462, H01J 314

Patent

active

043462928

ABSTRACT:
A scanner for mechanically distinguishing light from dark areas of an image, having a light source 4, a collecting lens 7 directing light from the source to surface 11 of a total internal reflective block 62 (block 9 in FIG. 1). The top, parallel surface 13 reflects the light through a focusing, hemispherical condenser lens 17. Light reflected from area 21 on document 23 is collected by the center of lens 17, passes through notch 64 (an area of non-surface 15 in block 9 in FIG. 1), and then through an objective lens 27, from which it is focused on phototransistor 29. The scanner functions well without precise positioning of document.

REFERENCES:
IBM Technical Disclosure Bulletin, vol. 16, No. 4, Sep. 1973, "Mask to Wafer Alignment System", R. Feder et al., p. 1307.
IBM Technical Disclosure Bulletin, vol. 16, No. 5, Oct. 1973, "Coupler for Optical Data", L. Cooper, pp. 1470-1471.
IBM Technical Disclosure Bulletin, vol. 22, No. 6, Nov. 1979, "Optical Focusing Technique", H. G. Nauth et al., pp. 2515-2516.

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