Illumination type optical recorded information reading device

Details Illumination type optical recorded information reading device Illumination type optical recorded information reading device

1991-02-07

1992-09-01

Shepperd, John W.

Registers

Coded record sensors

Particular sensor structure

315297, 323269, 362244, 362800, G06K 710, H05B 3702, F21V 508, G05F 1577

Patent

active

051441179

ABSTRACT:
An illumination type optical recorded information reading device including a plurality of light emitting elements, a photo detector for detecting optical indication on a media and converting the detected indication to electrical information, a plurality of driving elements for driving the light emitting elements, a driving current detector for detecting a total value of driving currents flowing through the driving elements, and a controller for comparing the total value with a reference value and generating a control signal to the driving elements so as to make a difference between the total value and the reference value constant. Further, a distribution of an illuminance of the light to be applied to the media is set in such a manner that the illuminance at positions spaced away from a central portion of a maximum detectable range of the photo detector is higher than that at the central portion, and that the illuminance at opposite end portions of the maximum detectable range is lower than that at the positions spaced away from the central portion.

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patent: 4941072 (1990-07-01), Yasumoto et al.
patent: 5025204 (1991-06-01), Su
patent: 5065188 (1991-11-01), Kobayashi et al.

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