JPH0594748A - Touch switch - Google Patents

Abstract

(57) [Abstract] [Purpose] To automate the assembly of the light guide plate and the holder for the guide of the optical element that can be mounted on the printed circuit board from the same direction as the electronic parts. [Structure] Printed circuit board 3, light emitting / receiving elements 4 and 5, an optical element holder 2 that holds the light receiving and emitting elements 4 and 5 and fixes it on the printed circuit board 3, and a light receiving and emitting element from above the optical element holder 2. In a touch switch having a light-shielding plate (1) for holding the projections (4, 5) and blocking light from directions other than the optical axis direction, assembling the tongue-shaped ground terminal (16) of the light-shielding plate (1) on the side surface of the optical element holder (2). Groove 2 at the position corresponding to the passage
5 is formed, and the light shielding plate 1 is an I-type touch switch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical sensor type touch switch.

[0002]

2. Description of the Related Art Conventionally, in this type of touch switch, an optical element holder is mounted on a printed circuit board, a light emitting / receiving element is incorporated in the optical element holder, and further, from the top of the optical element holder. It is covered with a shading plate for blocking necessary light.

The shading plate, in the assembled state, is generally mouth-shaped, which combines two L-shaped shading plate elements.

Further, the tongue-shaped ground terminal formed on a part of the light shielding plate is manually inserted along the side surface of the holder of the light emitting / receiving element into the hole of the printed board at the time of assembly.

[0005]

However, when attempting to mechanize these assembling, in the conventional L-shaped light-shielding plate, positioning is required at three points of the intersection of L-shape and the tip of two sides, There is a problem that machines cannot handle it.

Further, as described above, when the ground terminal is inserted by using the side surface of the light receiving element holder as a guide, if the ground terminal is bent inward, there is a problem that the light element will hit the top surface of the optical element holder and be bent. .

The present invention solves the above-mentioned problems of the conventional touch switch, and an object of the present invention is to provide a touch switch capable of automatically assembling the optical element holder and the light shielding plate.

[0008]

In order to achieve this object, the present invention provides a printed board, a light emitting / receiving element, an optical element holder for holding the light emitting / receiving element and fixing it on the printed board, and an optical element. In a touch switch equipped with a light blocking plate that holds the light emitting and receiving elements from protruding from the top of the holder and blocks light from directions other than the optical axis direction, use the tongue-shaped ground terminal of the light blocking plate on the side surface of the optical element holder. A groove is formed at a position corresponding to the road, and the light shielding plate is an I-type touch switch.

[0009]

In the present invention, since the light-shielding plate is of the I type, its positioning need only be done at two points, and can be easily mechanized.

Further, even if the tongue-shaped ground terminal of the light shielding plate is bent, since the optical element holder has a groove on the side surface at the time of assembly, there is no fear of collision and it can be inserted into the printed circuit board without trouble. .

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a light-shielding plate, 11 is a light-shielding portion, 12 is a positioning hole, 13 is a long hole for preventing rotation, 14 is each hole for floating in the Z direction, and 15 is a hole. Is a notch, and 16 is a tongue-shaped ground terminal.

Reference numeral 2 is a holder for the optical element, 21 is a guide hole for the light emitting / receiving element, 22 is a projection for positioning the light shield plate, 23 is a projection for preventing rotation of the light shield plate, and 24 is a float in the Z direction. Reference numeral 25 is a guide groove for a stopper projection.

Reference numeral 3 is a printed circuit board, 31 is a hole for inserting a ground terminal, 4 is a light emitting element, and 5 is a light receiving element.

An assembling method of this embodiment having such a structure will be described.

After mounting the optical element holder 2 on the printed circuit board 3, the light emitting element 4 and the light receiving element 5 are inserted into the guide holes 21 of the optical element holder 2. The I-shaped shading plate 1 is fitted along the outer shape of the optical element holder 2 from above. The positioning hole 12 and the rotation stopping elongated hole 13 are fitted to the projections 22 and 23 of the optical element holder 2, respectively, whereby the degrees of freedom in the X and Y directions are regulated. Since it is of type I, its positioning is easy.

Further, the square hole 14 sandwiched between the notches 15
Is a protrusion 24 for retaining the Z-direction having a wedge-shaped cross section.
The degree of freedom in the Z direction is regulated by overcoming. The notch 15 is for preventing the light shielding plate from being deformed.

Further, at that time, the tongue-shaped ground terminal 16
2, the tongue-shaped ground terminal 16 collides with the top surface of the optical element holder 2 because the optical element holder 2 has the guide groove 25 for the ground terminal, as shown in FIG. It can be easily inserted into the hole 31 for inserting the ground terminal on the printed circuit board 3 without concern. Incidentally, FIG. 3 is a conventional one, and as is apparent from the figure, since the groove 25 does not exist, the tongue-shaped ground terminal 1
If 6 is bent even a little, there is a risk of colliding with the top surface of the optical element holder 2.

[0019]

As described above, according to the present invention, a printed circuit board, a light emitting / receiving element, an optical element holder for holding the light emitting / receiving element and fixing it on the printed circuit board, and a light emitting / receiving element from above the optical element holder are provided. In a touch switch equipped with a light-shielding plate that suppresses the pop-out of the light and shields light from directions other than the optical axis direction, a groove is formed on the side surface of the optical element holder at a position corresponding to the assembly path of the tongue-shaped ground terminal of the light-shielding plate. Since the light shield plate is I-shaped, the light shield plate can be easily positioned, and the tongue-shaped Granso terminal of the light shield plate is
Since there is no risk of colliding with the optical element holder, it has an advantage that mechanization can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view of a touch switch according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the touch switch of the same embodiment.

FIG. 3 is a partial cross-sectional view of a conventional touch switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light-shielding plate 11 Light-shielding part 12 Positioning hole 13 Rotation stop long hole 14 Z direction floating stop hole 15 Notch 16 Tongue-shaped ground terminal 2 Optical element holder 21 Light emitting and receiving element guide hole 22 Light-shielding plate Positioning protrusions 23 Light-shielding plate rotation stopper protrusions 24 Z direction floating stopper protrusions 25 Guide grooves 3 Printed circuit board 31 Ground terminal insertion hole 4 Light emitting element 5 Light receiving element

Claims (1)

[Claims] 1. A printed circuit board, a light emitting / receiving element, an optical element holder for holding the light receiving / emitting element, and fixing the light emitting / receiving element on the printed circuit board; In a touch switch having a light blocking plate that blocks light from directions other than the optical axis direction, a groove is formed on a side surface of the optical element holder at a position corresponding to an assembly passage of a tongue-shaped ground terminal of the light blocking plate. The touch switch is characterized in that the light shielding plate is of an I type.