Patent ID: 9488522
Filing Date: 2016-11-08
CPC Classification: G01B,G01J,G06K

Claim Text:
1. An identifying device for detecting a specific region of a translucent medium, comprising: a driving unit configured to drive a translucent medium to move along a direction; a light-emitting module configured to emit light to intersect the direction; a light sensing module configured to (1) sense the light which has been passed through the translucent medium at one time instant so as to generate a first light-intensity signal, to (2) divide and stabilize voltages of the first light-intensity signal to derive a second light-intensity signal, and to (3) compare the second light-intensity signal with the first light-intensity signal to generate a comparison result; and a processing unit configured to determine whether a specific region of the translucent medium is exactly positioned between the light-emitting module and the light sensing module based on the comparison result, wherein the light-emitting module or the light sensing module is adjusted to allow an operation point of the light sensing module on a current-voltage characteristic curve to be in an active region of the current-voltage characteristic curve.