Edge detection device

Abstract

An edge detector comprises the following components: a linear sensor (1); a light source (2) which irradiates monochromatic light to the linear sensor (1); an edge position analyzing unit (4a) which detects the edge position (E) of detected object (3) of linear sensor (1) in the pixel arrangement direction according to the light quantity arrangement at the edge of detected object (3) in the optical path of monochromatic light; and a total light shielding determining unit (4b) which calculates the total light receiving amount until the pixel corresponding with the edge position (E) of the detected object (3) in the linear sensor (1) when the edge position (E) of the detected object (3) is detected by an edge position analyzing unit (4a). When the total light receiving amount is smaller than a pre-stored total light receiving amount until the pixel corresponding with the edge position (E) at a state that the light is totally irradiated, a total light shading state because of the existence of detected object (3) is determined.

Description

technical field [0001] The present invention relates to an edge detection device suitable for detecting the edge position of a transparent body such as a transparent film or glass, and controlling the position of the transparent body, for example. Background technique [0002] When there is an object in the optical path of monochromatic light represented by laser light, Fresnel diffraction occurs at the edge of the object. Therefore, an edge detection device has been developed that detects the position of the edge of the object by obtaining the light intensity distribution of the Fresnel diffraction using a line sensor and analyzing the light intensity distribution. [0003] In addition, in this application, the so-called "light quantity" represents the intensity of the aforementioned monochromatic light received by the light-receiving surface of the line sensor in proportion, and does not necessarily agree with the original definition based on human vision. [0004] That i...

AI Technical Summary

Problems solved by technology

For example, when adjusting the position of the detected object 3 while detecting the edge position of the detected object 3, since it is not known which state it is in the state where all the light enters the state or the state where the light is completely shielded, it occurs. The problem is that it is impossible to determine the direction in which the position of the detected object 3 needs to be corrected, etc.

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