JPH0343630Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention is a switch that uses a light emitting element and a light receiving element, and uses a part of the light from the light emitting element for illumination. Regarding lighting devices.

(Prior Art) As one means for making a switch contactless, it has been conventionally practiced to use a light emitting element such as a light emitting diode and a light receiving element such as a phototransistor. There is a demand for this type of switch to be illuminated at night.

(Problems to be Solved by the Invention) In order to meet such demands, conventionally, it has generally been considered to separately provide a light emitting diode for night illumination. However, since a light emitting diode for configuring the switch and a light emitting diode for night illumination must be separately provided, the manufacturing cost is high.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lighting device for a switch that can reduce manufacturing costs by providing illumination using a light projecting element for operating the switch.

[Structure of the invention] (Means for solving the problems) The present invention provides a movable part in the light guide member disposed on the substrate, and when the movable part is moved, the tip of the movable part moves to the opposite position. a light guide member that emits light into the light guide member; a light receiving element that receives light from the light guide member and generates a switching signal in a light receiving state; The device is characterized by being provided with a light-transmitting member that guides a portion of the light passing through the member to the outside for illumination.

(Function) According to the above means, since a part of the light from the light emitting element for switch operation is used for illumination, there is no need to provide a dedicated light emitting element for illumination.
Therefore, manufacturing costs can be reduced.

(Example) An example of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a printed circuit board, on which a light emitting diode 2 as a light emitting element and a phototransistor 3 as a light receiving element are mounted at predetermined intervals. A reinforcing member 4 is provided on the top surface of the printed circuit board 1.
The reinforcing member 4 has through holes 5 facing the light emitting diode 2 and the phototransistor 3, respectively.
and 6 are provided. Further, light shielding members 7 and 8 are sequentially attached to the upper surface of the reinforcing member 4. Reference numeral 9 denotes a substantially L-shaped light guide member with one end facing the phototransistor 3. Reference numeral 10 denotes a light guide member disposed on the upper surface of the light shielding member 8, and a shaft-shaped portion 10a formed integrally with the light guide member 10 is connected to the light shielding members 7, 8.
The lower end thereof is opposed to the light emitting diode 2 by passing through holes 7a and 8a provided therein. and,
A substantially V-shaped notch 10b is formed in a portion of the light guiding member 10 that faces the upper end of the shaft portion 10a. 11 is a movable part formed on the light guide member 10, and a convex part 11a is provided on the lower surface of this movable part. Reference numeral 12 denotes a substantially arc-shaped spring disposed on the upper surface of the reinforcing member 4, the middle portion of which is in contact with the convex portion 11a, and the movable portion 11 is always moved by this spring 12 as shown in FIG. It is biased toward its original position.
A light shielding member 13 is disposed on the upper surface of the light guide member 10, and a convex portion 13a for operation is provided on the upper surface of the light shielding member 13 at a portion facing the movable portion 11. Reference numeral 14 denotes a light transmitting member disposed so as to penetrate the light shielding member 13, and the lower end of this member is in contact with the cutout portion 10b of the light guide member 10.

Next, the operation of the above configuration will be explained. When the convex portion 13a of the light shielding member 13 is not operated, the movable portion 11 is positioned at its original position by the biasing force of the spring 12 as shown in FIG. The light guide member 9 is in a non-opposed state. Therefore, in this state, the light from the light emitting diode 2 is directed toward the shaft-shaped portion 10a of the light guide member 10.
The phototransistor 3 enters the part 10c of the light guide member 10 through the movable part 11 and the light guide member 9, and the phototransistor 3 is in an off state.
When the convex portion 13a of the light shielding member 13 is pushed in from this state, the movable portion 1 swings in the direction of arrow A, and the tip of the movable portion 11 comes to face the other end of the light guide member 9. The light from the light emitting diode 2 enters the light guide member 9 via the shaft-like part 10a and the movable part 11 of the light guide member 10 in this order, and the light reaches the phototransistor 3 via the light guide member 9. Therefore, the phototransistor 3 turns on and generates a switching signal.

On the other hand, the light from the light emitting diode 2 is transmitted to the light guide member 1.
When the light reaches the notch 10b through the light guide member 10, a part of the light leaks out from the outer periphery of the light guide member 10, and the leaked light is emitted from the light transmitting member 14 to the outside, and this light causes the light to pass through the light guide member 10. Member 14 is illuminated.

Note that fine irregularities are formed on the upper surface of the movable part 11 of the light guide member 10 and the convex part 13 of the light shielding member 13 is formed.
If a is made transparent or translucent, this portion can be made into a light-transmitting member, and therefore, the entire position of the convex portion 13a can be displayed. It goes without saying that the position of the light-transmitting member 14 can be changed to a part other than the above-described embodiment. A CDS can also be used as the light receiving element.

In addition, in the above configuration, since the other end of the light guide member 9 is located further back than the end surfaces of the light shielding members 7 and 8, the movable part 11 is moved and only a portion thereof faces the light guide member 9. This prevents the phototransistor 3 from turning on.

[Effects of the invention] As is clear from the above explanation, the present invention provides illumination at night by extracting part of the light for switch operation from the light guide member and applying it to the light-transmitting member. Therefore, there is no need to provide a dedicated light projecting element for illumination, and therefore manufacturing costs can be reduced.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional view, and FIG. 2 is a longitudinal sectional view showing an operating state different from that in FIG. 1. In the drawing, 1 is a printed circuit board, 2 is a light emitting diode (light emitting element), 3 is a phototransistor (light receiving element), 9 is a light guide member, 10 is a light guide member, 11
12 is a movable part, 12 is a spring, and 14 is a transparent member.

Claims (1)

[Scope of utility model registration request] A light guide member disposed on a substrate, a light projecting element provided to project light into the light guide member, a movable part provided in the light guide member, and a light guide member disposed in the light guide member; a light guide member with the tips of the movable parts facing each other; a light receiving element arranged to receive light from the light guide member and generating a switching signal in a light receiving state; A lighting device for a switch comprising a translucent member that guides a portion of the light to the outside for illumination.