Patent ID: 6642510
Filing Date: 2003-11-04
Classification: G01S,G01V,H03K

Abstract:
A photoelectric switch device for detecting a presence or an absence of an object in a specified field of detection, which has at least a photoelectric means for receiving light from the field of detection and generating an electric signal of a level representing an amount of light received thereby and processing means for processing the electric signal from said photoelectric means, for making a determination of the presence or the absence of the object in the field of detection on the basis of a comparison of the level of the electric signal from said photoelectric means with a specified threshold and providing an electric signal representing a result of the determination, said photoelectric switch device comprising:a generally rectangular-parallelepiped box casing defined by a plurality of walls in which said photoelectric means and said processing means are installed; optical means disposed on a front wall of said generally rectangular-parallelepiped box casing for directing light from the field of detection to said photoelectric means; display means disposed on a rear wall of said generally rectangular-parallelepiped box casing opposite to said front wall and operatively connected to said processing means for providing a display of at least one of the specified threshold and the level of the electronic signal from said photoelectric means; adjusting means disposed on said rear wall and operatively connected to said processing means for selecting one of the specified threshold arid the level of the electronic signal from said photoelectric means to be displayed on said display means and adjusting the specified threshold while the specified threshold is displayed on said display means; and detection result indicator means disposed between said rear wall and a top wall of said generally rectangular-parallelepiped box casing connecting said top wall and said rear wall to each other and operatively connected to said processing means for indicating the result of the determination.