JP2555670Y2 - Operation button mounting structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing generation of abnormal noise at a place where plastic parts used in electronic equipment and the like come into contact.

[0002]

2. Description of the Related Art Conventionally, a structure in which a projection boss is protruded from an operation button and pressed against an electronic circuit board to provide a boss for preventing the operation button from falling off from a front panel is generally used. When the boss of the operation button is in direct contact with the electronic circuit board made of phenolic resin, the boss of the operation button expands thermally due to the temperature rise inside the housing and moves from the initial contact position. Abnormal noise is generated by rubbing with the substrate. At this time, grease is applied by adding a step to the contact position between the boss for preventing the operation button from falling off and the electronic circuit board, thereby preventing generation of abnormal noise.

[0003]

[Problem to be Solved by the Invention] A structure in which the operation button drop prevention boss is pressed against the electronic circuit board in order to prevent the operation button from dropping from the front panel. However, since it cannot be prevented from moving from the initial contact position due to thermal expansion due to the temperature rise, there has been a defect that the bosses for preventing the operation buttons from falling off and the electronic circuit board are rubbed, and abnormal noise is generated.

[0004]

According to the present invention, an operation button, a boss that elastically supports the operation button, and an electronic circuit board that is switched by pressing the operation button against the elasticity are provided. A switch, a printed coating made for displaying circuit components of the electronic circuit board,
An operation button mounting structure including means for sandwiching the boss between the coating film of the electronic circuit board and the housing. According to another aspect of the present invention, there is provided an operation button, a boss elastically supporting the operation button, a switch wired on an electronic circuit board that is switched by pressing the operation button against the elasticity, and the electronic circuit board. And a means for clamping the boss between the concavo-convex portion of the electronic circuit board and the housing, the concavo-convex portion having a large frictional resistance at a contact portion of the circuit pattern connecting the electronic components to the boss with the boss. This is an operation button mounting structure.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment. FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is an explanatory view showing a state in which a drop-off prevention boss of an operation button thermally expands due to a rise in temperature inside a housing and moves from an initial contact position. Housing 1
The operation button 3 made of a plastic member attached to the front panel 2 disposed on the front surface of the front panel 2 pushes a fall prevention boss 4 against the electronic circuit board 5 made of a phenol resin member so that the operation button 3 does not fall off the front panel 2 due to an external force A or the like. The switch is mounted between the panel 2 and the electronic circuit board 5 and operates a switch 7 provided on the electronic circuit board 5. The falling-off prevention boss 4 of the operation button 3 thermally expands in the arrow B direction due to a rise in the temperature inside the housing 1. Since the thermally expandable falling-off prevention boss 4 is constantly pressed against the electronic circuit board 5, it moves in the direction of arrow C, for example, to absorb the thermally expanded length. At this time, if the fall prevention boss 4 and the electronic circuit board 5 are in direct contact with each other, an abnormal sound is generated, so that the coating film 6 is applied to the electronic circuit board 5 by silk printing. The silk printed coating 6 prevents the falling-off prevention boss 4 from directly contacting the electronic circuit board 5, so that vibration loss is added between the operation button 3 and the electronic circuit board, and no abnormal noise due to resonance is generated. Also, instead of the coating film 6 shown in FIG. 1, it can contact the falling-off prevention boss 4 as a circuit pattern to increase the frictional resistance on the uneven pattern surface and prevent movement due to thermal expansion.

[0006]

[Effect of the Invention] According to the present invention, the boss for preventing the operation button from falling out of the plastic member and the electronic circuit board such as the phenolic resin member do not directly come into contact with each other. It is possible to reliably prevent the generation of abnormal noise even when moving from the initial contact position.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention.

FIG. 2 is a diagram showing a state in which a drop-off prevention boss of an operation button moves.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Front panel 3 Operation button 4 Fall prevention boss 5 Electronic circuit board 6 Paint film 7 Switch

Claims (2)

(57) [Scope of request for utility model registration] An operation button, a boss elastically supporting the operation button, a switch disposed on an electronic circuit board that is switched by pressing the operation button against the elasticity, and a switch of the electronic circuit board. A mounting structure for an operation button, comprising: a coating film formed by printing for displaying circuit components; and means for holding the boss between the coating film and the housing of the electronic circuit board. 2. An operation button, a boss elastically supporting the operation button, a switch wired on an electronic circuit board which is switched by pressing the operation button against the elasticity, and a switch connected to the electronic circuit board. An uneven portion having a large frictional resistance at a contact portion of the circuit pattern connecting the electronic components to be assembled with the boss, and means for sandwiching the boss between the uneven portion and the housing of the electronic circuit board are provided. A mounting structure for an operation button, characterized in that: