Photo-electrical detecting apparatus

Details Photo-electrical detecting apparatus Photo-electrical detecting apparatus

1979-06-19

1981-04-14

Hostetter, Darwin R.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356446, G02B 2106

Patent

active

042622085

ABSTRACT:
This invention relates to a photo-electrical detecting apparatus for forming a dark-field image of an object on a one-dimensional image sensor and reading said image photo-electrically. The apparatus includes a telecentric objective lens, and a light source image is formed on the clear aperture plane of said lens, said image being in focus in a direction on said plane and out of focus in a perpendicular direction. A line- or band-shaped area of the object is illuminated by the light from said light source image. Thus a dark-field image of the object is formed on said one-dimensional image sensor by providing, on a plane equivalent to said aperture plane, a filter which intercepts the normal reflected light from said object and transmits the scattered light therefrom.

REFERENCES:
patent: 4062623 (1977-12-01), Suzuki et al.

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