JPH0741936U - Reflector for reflective photoelectric switch - Google Patents

Abstract

(57) [Summary] [Object] To provide a reflector for a reflective photoelectric switch in which the flatness of the reflecting surface of the reflector 1 is maintained even when used in an environment with high ambient temperature. A reflector for a photoelectric photoelectric switch has a waterproof structure in which a peripheral edge of a reflector 1 and a peripheral edge of an opening of a surface of a base 2 are adhered to each other, and a recess 20 is provided on a back surface of the base 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reflector for a reflective photoelectric switch.

[0002]

[Prior art]

 A reflector generally used as a reflector for a reflection type photoelectric switch is an assembly of tetrahedral prisms having three surfaces orthogonal to each other. The incident light is returned in the same direction as the incident direction after three total reflections. It is a reflector with the characteristic that

FIG. 4 is a sectional view of a conventional reflector for a reflective photoelectric switch. The reflector 1 as described above is arranged in the opening of the surface of the base 2, and the peripheral edge of the reflector and the peripheral edge of the base opening are bonded to form a waterproof structure. Therefore, the air between the reflector 1 and the base 2 is sealed.

[Problems to be solved by the device]

When such a reflector for a photoelectric photoelectric switch is used in an environment with a high ambient temperature, the air sealed between the reflector 1 and the base 2 expands and the surface (reflecting surface) of the reflector 1 is expanded. Since the projections are convex, the flatness is not maintained, and there is a problem that the reflected light is not emitted in parallel with the incident light.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a reflector for a reflective photoelectric switch, which is resistant to changes in ambient temperature.

[0006]

[Means for Solving the Problems]

 A reflector for a photoelectric photoelectric switch according to the present invention comprises a reflector having a plurality of tetrahedral prisms having three surfaces orthogonal to each other, and a base having an opening on the surface for arranging the reflector, and a peripheral edge of the reflector. In the reflector for a photoelectric photoelectric switch, which has a waterproof structure by being adhered to the periphery of the base opening, a recess is provided on the back surface of the base.

[0007]

[Action]

 According to the present invention, a concave portion is provided on the back surface of the base of the reflector for a reflective photoelectric switch, and the thickness of the base in that portion is reduced to reduce the mechanical strength. By doing so, even if the air sealed between the reflector and the base expands due to the increase in ambient temperature, only the concave portion on the back surface of the base deforms, the reflecting surface of the reflector does not deform, and the flatness is maintained. The reflected light is emitted in parallel with the incident light.

[0008]

【Example】

 FIG. 1 is a perspective view of the back surface of a reflector for a reflective photoelectric switch of the present invention, and FIG. 2 is a sectional view of the present invention. A recess 20 is provided on the back surface of the base 2, and a reflector 1 having a plurality of tetrahedral prisms having three surfaces orthogonal to each other is arranged in the opening of the surface of the base 2, and the peripheral edge of the reflector 1 and the peripheral edge of the opening of the base 2 surface are It is adhered by ultrasonic welding or the like to have a waterproof structure, and the air between the reflector 1 and the base 2 is sealed.

When the ambient temperature rises and the sealed air expands, only the base back surface recess 20 is deformed as shown in FIG. 3, and the reflector 1 is not affected, so that the flatness of the reflecting surface of the reflector 1 is maintained. Be done.

[0010]

[Effect of device]

 According to the present invention, the concave portion is provided on the back surface of the base of the reflector for the reflection type photoelectric switch to weaken the mechanical strength of that portion, so that the flatness of the reflecting surface of the reflector is maintained even when used in an environment with high ambient temperature. Has the effect.

[Brief description of drawings]

FIG. 1 is a perspective view of the back surface of a reflector for a reflective photoelectric switch according to the present invention.

FIG. 2 is a sectional view of a reflector for a reflective photoelectric switch according to the present invention.

FIG. 3 is a sectional view when the air of the present invention is expanded.

FIG. 4 is a cross-sectional view of a conventional reflector for a reflective photoelectric switch.

[Explanation of symbols]

 1 reflector 2 base 20 base recess on back surface

Claims (1)

[Scope of utility model registration request] 1. A reflector having a plurality of tetrahedral prisms each having three surfaces orthogonal to each other, and a base having an opening on the surface for disposing the reflector, the reflector peripheral edge and the base opening peripheral edge. A reflector for a photoelectric photoelectric switch, wherein the reflector is adhered to form a waterproof structure, and a recess is provided on the back surface of the base.