Code readout apparatus
First Claim
1. A code readout apparatus for reading out information indicated in the form of broad and narrow marks and intervening broad and narrow blanks juxtaposed in the scanning direction, which comprises a readout head having a first detector for reading out an output representing the central area of an image on the illuminated surface of a recording medium and converting said output into an electrical signal, and a second detector for reading out an output denoting the peripheral area of said image and converting said output into an electric signal;
- a judgment circuit provided with means for indicating a difference between outputs from the first and second detectors and means for judging from said difference whether the marks and blanks are broad or narrow, the first and second detectors each being provided with a semiconductor device received in the readout head and formed of a large number of juxtaposed PN junctions, the central one of which is supplied with light reflected from the central area of an image on the surface of a recording medium and all the junctions of which are supplied with light reflected from the peripheral portion of said image.
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Accused Products
Abstract
A readout apparatus for indicating data recorded in the form of marks bearing different widths and intervening blanks also having different widths which comprises a photosensitive device for optically detecting narrow marks and intervening narrow blanks and generating corresponding electric signals; a second photosensitive device for optically detecting broad marks and intervening broad blanks and generating corresponding electric signals; and an electric circuit for reading out a difference between both electric signals and sending forth signals representing the above-mentioned broad and narrow marks and intervening broad and narrow blanks from said difference.
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Citations
2 Claims
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1. A code readout apparatus for reading out information indicated in the form of broad and narrow marks and intervening broad and narrow blanks juxtaposed in the scanning direction, which comprises a readout head having a first detector for reading out an output representing the central area of an image on the illuminated surface of a recording medium and converting said output into an electrical signal, and a second detector for reading out an output denoting the peripheral area of said image and converting said output into an electric signal;
- a judgment circuit provided with means for indicating a difference between outputs from the first and second detectors and means for judging from said difference whether the marks and blanks are broad or narrow, the first and second detectors each being provided with a semiconductor device received in the readout head and formed of a large number of juxtaposed PN junctions, the central one of which is supplied with light reflected from the central area of an image on the surface of a recording medium and all the junctions of which are supplied with light reflected from the peripheral portion of said image.
- View Dependent Claims (2)
Specification