Surface inspecting apparatus with surface inspection width adjustment
AssigneeFuji Photo Film Co., Ltd.
InventorIppei Takahashi
Life of this patent
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Abstract
A surface inspecting apparatus generates an inspecting width gate signal by in a procedure wherein when the subject matter is subjected to the scanning via the light beam, a counting means digitizes the detected position of both the front and rear ends of the subject and then an operating means calculates values which indicate the positions included within the range between both of the ends, thus generating the inspecting width gate signal. Consequently, it is possible to inspect any subject matter without manually resetting the effective inspecting range whenever a subject matter changes in width.
Claims10
A surface inspecting apparatus wherein a subject having a front end and a rear end is inspected for detecting defects on a surface thereof by means of a scanner scanning and irradiating a light beam on said subject while said subject is being conveyed, said apparatus comprising:
- light detecting means for detecting said light beam before the starting of every scan;
- light receiving means for receiving light reflected from said subject;
- first counting means for making a first count during an interval from when said light detecting means detects said light beam until said light receiving means detects the front end of said subject;
- second counting means for making a second count in an interval from when said light detecting means detects said light beam until said light receiving means detects the rear end of said subject;
- operating means for calculating a first value which is larger than the first count counted via said first counting means by a predetermined amount, as well as a second value which is smaller than the second count counted via said second counting means by a predetermined amount;
- and gate signal generating means for generating a gate signal in accordance with the first and second values in order to select an effective portion out of the reflected light obtained via said light receiving means.
A surface inspecting apparatus wherein a subject having a front end and a rear end is inspected for detecting defects on a surface thereof by means of a scanner scanning and irradiating a light beam on said subject while said subject is being conveyed, said apparatus comprising:
- light detecting means for detecting said light beam before the starting of every scan;
- light receiving means for receiving light reflected from said subject;
- counting means for making a count during an interval from when said light receiving means detects the front end of said subject until said light receiving means detects the rear end of said subject;
- operating means for calculating a value which is smaller than the value counted via said counting means by a first predetermined amount;
- and gate signal generating means for generating a gate signal according to a second predetermined amount from the the front end detected by said light receiving means and the value calculated by said operating means in order to select an effective portion out of the reflected light obtained via said light receiving means.
Dependencies are inferred from the claim text.