Patent ID: 11858775
Assignee: LAUREL PRECISION MACHINES CO., LTD.
Field: Control (Instruments)
Classification: CPC B  G | IPC B  G

Claim 8:
9. A paper sheet detection method comprising:
emitting light by a light-emitting portion;
receiving the emitted light by a light-receiving portion;
determining whether a level of the light received by the light-receiving portion is equal to or greater than a first threshold value and less than a second threshold value, the first threshold value being used for determining whether or not a paper sheet is present in a path of the emitted light, the second threshold value being set to a value less than a target light-receiving level set as a target value of the level of the light received by the light-receiving portion in a state where the paper sheet is not present;
estimating whether or not the paper sheet is present; and
adjusting an amount of the light emitted by the light-emitting portion so that the level of the light received by the light-receiving portion becomes the target light-receiving level in the state where the paper sheet is not present when it is estimated that the paper sheet is not present after it is determined that the level of the light received by the light-receiving portion is equal to or greater than the first threshold value and less than the second threshold value.