RU2400853C1 - Push buttom switch - Google Patents

Abstract

FIELD: electrical engineering. ^ SUBSTANCE: proposed switch comprises case with openings accommodating clock switch and key accommodating illumination elements secured on pcb, and incorporates at least one flexible element secured to case base. Flexible conductor is passed through one o case openings so that conductor one end extends outward and other end is secured to pcb arranged inside the key. Clock switch is arranged on the key lower side, switch pusher directed downward. ^ EFFECT: simplified replacement, higher reliability, simple design and reduced production costs. ^ 2 dwg

Description

The invention relates to the field of electrical engineering, in particular to switching equipment, which is required to provide backlighting for symbols and splash protection, and can be used in information input and conversion systems as contact devices.

A technical solution is known in which a button with electronic control of the brightness and color of the backlight (Patent EP No. 1005055, H01H 13/02, published March 20, 2008) comprises a pusher with a coil spring, contacts and controls for incoming signals in its housing with connectors . The key, in which the pusher abuts, contains semiconductor lighting elements, optical parts, reflectors. In this analogue, the key with lighting elements is separated from the electrical contact switch.

The disadvantages of this solution include the complexity of the design due to the large number of parts that make up the product, and, as a result, low maintainability.

As a prototype, a button is selected, which is one of the nodes of the electronic keyboard with backlight (US Patent No. 6720892, H01H 13/70; H03M 11/00, publ. 13.04.2004). The button consists of a key with a cavity for LEDs, LEDs, flexibly rigid and rigid printed circuit boards. The LEDs are located on the hard part of the flex-rigid printed circuit board in contact with the key, and the clock switch is located on the rigid printed circuit board. When you press a key, it presses on the clock pusher made of elastic material using the hard part of a flexible-rigid printed circuit board.

The disadvantage of this prototype is the possibility of accidental operation of the switch pusher during vibrations and accidental keystrokes and, in addition, the sensitivity of the material of the switch pusher to low temperatures; also a disadvantage is the low maintainability of the device, since the failure of a separate unit requires the replacement of the entire printed circuit board, which leads to a high cost of repairing the product. In addition, the presence of several printed circuit boards leads to a decrease in the reliability of the device, as well as to complicate the design.

The technical result of the proposed invention is to simplify the replacement of a push button switch while providing splash protection, improving reliability, simplifying the design, as well as reducing production costs.

The technical result is achieved in that the push-button switch comprises a housing within which a clock switch is located, a key in which lighting elements are mounted on a printed circuit board. Moreover, it contains at least one elastic element attached to the base of the housing having holes, through one of which a flexible conductor is led out to one end, the other end of which is connected to a printed circuit board located inside the key and containing a clock switch mounted on it bottom side pusher down.

The invention is illustrated by drawings.

Figure 1 - Button switch in the housing with an elastic element (section).

Figure 2 - Button switch in the housing with an elastic element (three-dimensional view).

The button switch (FIG. 1) contains a housing 1 with holes 2 for the natural flow of water droplets, a key 3 made of optically transparent material, in the cavity of which there is a printed circuit board 4 with radio elements (not shown) and LEDs 5. This arrangement of the printed circuit board 4 allows to ensure its splash protection, since water, once on the key, flows down to the bottom of the case without touching the printed circuit board.

A flexible conductor 6 (for example, a cable, wire or a flexible printed circuit board) with a connector 7 (FIG. 2) is connected to the printed circuit board 4, connecting the printed circuit board 4 to a control unit (not shown) located outside the button switch housing. At the same time, the replacement of the push-button switch is simplified, since the failure of one element of the device will allow only its replacement without difficulty.

On the underside of the circuit board 4, a clock switch 8 is pushed downward. This arrangement protects it from water droplets, which leads to an increase in the reliability of the device.

To eliminate the accidental operation of the clock switch 8 as a return mechanism, it uses an elastic element 9, fixed to the base of the housing, for example, a spring mechanism or a rubber gasket.

On the housing 1 of the push-button switch are fasteners 10, which increase the resistance of the entire device to vibration. The fastening element 10 can be made in the form of stops on the housing or a flat spring with hooks. The use of an individual housing for each switch makes it easy to replace a failed element.

The push button switch operates as follows. When you press the button 3, it translates into the body 1 of the button switch and compresses the elastic element 9 until the timing switch 8. When the timing switch 8 is activated, the information signal is transmitted via the flexible conductor 6 to the control unit. After removing the effect on the key 2, it returns to its original state.

Inside the key, partitions of opaque material can be installed between the LEDs, and above them are color filters to increase the information content of the signals. Different colors of LEDs can also be selected. Ensuring the isolation of the lighting elements of each switch improves their lighting parameters.

To prevent heating of the radio elements in the free space under the printed circuit board, a radiator can be installed on it.

As the body of the push-button switch, a multi-button dial field (keyboard) may be used, consisting of push-button switches independent of each other. In the case of the type-setting field, holes can be made for outputting flexible conductors connected to the processing unit of the received information, as well as for the natural flow of water drops.

Given the above, it can be concluded that thanks to the proposed solution, the claimed technical result is achieved: simplification of the design of the push button switch, reducing the cost of its production, as well as ensuring the reliability of the device with a high degree of splash protection, while simplifying the replacement of a failed push button switch .

From the foregoing, it follows that the claimed invention has advantages over the prototype and meets the criteria of patentability of the invention.

Claims (1)

A push-button switch comprising a housing, within which a clock switch is located, a key in which lighting elements are mounted on a printed circuit board, characterized in that it comprises at least one elastic element attached to the base of the housing having openings, through one of which one end leads out a flexible conductor, the other end of which is connected to a printed circuit board located inside the key and containing a clock switch mounted on its underside with a pusher h.

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