JPH0741913U - Rubber key switch - Google Patents

Abstract

(57) [Abstract] [Purpose] A seal part provided on the lower surface of the periphery of the rubber key switch body prevents dust and water from entering, and a lamp air chamber creates a ventilation path from the cavity of the rubber key switch body switch part. It suppresses the rise in internal pressure due to the air pushed out and houses the lamp to illuminate the upper part. [Arrangement] Air pushed out from the cavity portion 26, 26 of the switch portion 23, 23 having the seal portion 21 on the lower surface of the peripheral edge portion of the rubber key switch body 20 and the movable contact 25 inside when the push button portions 22, 22 are pressed. Vent passage 2
8, 28 and a lamp air chamber 27 having a spherical portion 24 for suppressing an increase in internal pressure and accommodating the lamp and illuminating the upper side.
Are integrally formed with the rubber key switch body 20.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a rubber key switch used for opening and closing a power window of an automobile.

[0002]

[Prior art]

 Conventionally, there is a rubber key switch having a structure shown in FIGS. 3 and 4, for example. The prior art shown in FIG. 3 is a rubber key switch disclosed in Japanese Utility Model Laid-Open No. 3-12326, but the rubber key switch body 1 is mounted by being sandwiched between a housing (not shown) and a printed circuit board 2. The peripheral lower surface seal portion 3 of the rubber key switch body is in close contact with the printed circuit board 2 to prevent dust and water from entering from the outside.

The rubber key switch body 1 has a movable contact 6 provided inside the conical switch parts 5 and 5 which press the push button parts 4 and 4, and a fixed contact 7 printed on the printed circuit board 2. Contact and turn on. At this time, the conical shaped switch parts 5 and 5 bend and the air pushed out from the hollow parts 8 and 8 escapes to the air chamber 10 through the ventilation passage 9 and suppresses the rise of the internal pressure to reduce the resistance when the switch is operated. It has disappeared.

As another example of the conventional technique shown in FIG. 4, a rubber key switch body 11 is provided with a lamp chamber 12 at the position of the air chamber 10 shown in FIG. 13 is the same as the structure of FIG. 3 except for these two points. The rubber key switch body 11 is illuminated upward by a lamp 14 provided in a lamp chamber 12, and when the switch is turned on, the switch portions 15 and 15 are bent and the air in the inner cavity portions 16 and 16 flows through the ventilation passages 13 and 13. It is discharged into the atmosphere as it passes through and facilitates the operability when operating the switch.

[0005]

[Problems to be solved by the device]

 In the prior art shown in FIG. 3, in the prior art shown in FIG. 3, when the switch is turned on, the switches 5 and 5 are bent and the air in the inner cavities 8 and 8 passes through the ventilation passage 9 to generate internal pressure in the air chamber 10. Is prevented from rising, and the seal portion 3 prevents dust and water from entering from the outside. However, there is a problem that it cannot be used as an illumination switch because there is no lamp room to accommodate the lamp. Further, the prior art shown in FIG. 4 is an illumination switch for illuminating the upper side by the lamp 14 provided in the lamp chamber 12, but the air pushed out from the cavity portions 16 and 16 of the switch portions 15 and 15 is ventilated through the ventilation passages 13 and 13. Since it is a structure that escapes to the outside, there is a problem that dust and water from the outside enter from the ventilation passages 13 and 13 and easily cause a failure.

[0006]

[Means for Solving the Problems]

 In view of the above drawbacks, the present invention has a rubber key switch body, in which a seal portion is formed on the lower surface of a peripheral portion which is pressed against a case so as to be in close contact with a printed circuit board and prevent intrusion of dust and water from the outside. The ventilation passage that allows the air pushed out of the cavity of the switch to escape when each push button is pressed, and the rise in the internal pressure due to the air that is connected to the ventilation passage and pushed out of the cavity is suppressed and the lamp is housed to illuminate the upper side. It is characterized in that it is integrally formed with the lamp air chamber.

[0007]

【Example】

 1 and 2 show an embodiment of a rubber key switch according to the present invention. FIG. 1 is a front view of the rubber key switch, and FIG. 2 is an actual view taken along the line I--I of FIG. It is sectional drawing which shows a mounting state.

The rubber key switch body 20 includes a seal portion 21 provided on a lower surface of a peripheral portion, push button portions 22 and 22 on an upper portion, and switch portions 23 and 23 formed in a conical shape below the push button portions 22 and 22. A lamp air chamber 27 formed by projecting a spherical portion 24 in the center, and movable contacts 25 provided inside the switch portions 23, 23 to form hollow portions 26, 26, and the lamp air chamber 27 and the switch. Ventilation passages 28, 28 provided between the hollow portions 26, 26 of the portions 23, 23 are integrally formed in the rubber key switch body 20.

The rubber key switch body 20 is mounted by inserting the peripheral edge portion between the pressing portion 30 of the case 29 and the printed board 31, and the seal portion 21 on the lower surface of the peripheral edge is brought into close contact with the printed circuit board 31 and externally. Prevents dust and water from entering. That is, the pressing portion 30 can completely press the seal portion 21 against the printed circuit board 31 by the pressing force.

The lamp air chamber 27 has two functions of a lamp chamber and an air chamber. The first function is to change the color of the illumination by changing the color of the illumination by coloring the surface of the spherical portion 24 with a light-transmitting color. The lamp chamber accommodates the lamp 32 for diffusing the light of the lamp 32 provided on the printed circuit board 31 in the section 24 and illuminating the translucent section 33 of the upper case 29. The second function is to push the knobs 35, 35 that are inserted into and retracted from the openings 34, 34 of the case 29 to urge the push button portions 22, 22 of the rubber key switch body 20. This is an air chamber that bends the conical switch parts 23, 23 and suppresses an increase in internal pressure due to the air pushed out from the inner cavity parts 26, 26, thereby eliminating the resistance during the switch operation.

The ventilation passages 28, 28 are formed between the hollow portions 26, 26 of the switch portions 23, 23 and the lamp air chamber 27, and are inserted into and retractable from the openings 34, 34 of the case 29. Then, when the movable contact 25 and the fixed contact 36 come into contact with each other by the pressing operation of the knobs 35, 35 for urging the push button portions 22, 22 of the rubber key switch body 20 and the switch is turned on, the switch portions 23, 23 This is a ventilation path for allowing the air pushed out from the hollow portions 26, 26 of the lamp to escape to the lamp air chamber that suppresses the rise in internal pressure.

[0012]

[Effect of device]

 According to the invention, a seal portion is formed on the lower surface of the peripheral portion of the rubber key switch body, and a ventilation passage for releasing air pushed out from the cavity of each switch portion when the push button portion is pressed, and a ventilation passage connected to the ventilation passage Since the rise of the internal pressure due to the extruded air is suppressed and the lamp air chamber that houses the lamp and illuminates the upper part is integrally formed with the rubber key switch body by the pressing part of the case, the seal part is printed. It is possible to reduce the number of parts and the cost by providing one rubber key switch with the two functions of being in close contact with the substrate and preventing the ingress of dust and water from the outside, and being able to illuminate the upper side with a lamp.

[Brief description of drawings]

FIG. 1 is a front view of a rubber key switch according to the present invention.

FIG. 2 is a cross-sectional view showing a mounted state in the direction of the arrow I-I of FIG.

FIG. 3 is a cross-sectional view of a rubber key switch main body including a printed circuit board having an air chamber and showing a conventional technique.

FIG. 4 is a cross-sectional view of a rubber key switch main body including a printed circuit board having a lamp chamber and showing a conventional technique.

[Explanation of symbols]

 20 Rubber Key Switch 21 Sealing Part 24 Spherical Part 27 Lamp Air Chamber 28, 28 Ventilation Path 30 Pressing Part

Claims (1)

[Scope of utility model registration request] 1. A seal portion provided on a lower surface of a peripheral edge portion which is pressure-contacted with a case, a lamp air chamber having a spherical portion projecting in the center so as to cover the periphery of the lamp, and a switch portion having a contact point with the lamp air chamber. A rubber key switch in which the main body of the rubber key switch is laid on the printed circuit board and has a ventilation path that connects the cavities.