JPH0341377Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application This invention relates to a drip-proof structure for a panel switch section disposed on a display operation panel of an underwater detection display device, for example.

(b) Prior Art FIG. 3 shows a cross-sectional structure of a conventional panel switch section. In the figure, 1 is, for example, a contact type push switch, 1a is a fixed side, and 1b is a movable side. The fixed side 1a is connected to a predetermined electric circuit (not shown) by soldering, for example, to a printed wiring board 2. 3 is a housing, which includes a printed wiring board 2 and the housing 3;
This is to protect other electronic components (not shown) in between, and is fixed in place with a spacer 4 or the like.
5 is the role of each switch 1 on the surface of the housing 3,
For example, it is a front panel with characters such as ON, OFF, AGC, and other necessary symbols drawn on it. A button 6 is attached to the movable side 1b of the touch switch 1 in consideration of its operability, and a hole 7 is formed in the housing 3 and the panel 5 to match the diameter of the button 6. Reference numeral 8 denotes a drip-proof sponge attached to the button 6 side, for example, in order to provide drip-proofing during normal use.

(c) Problems to be solved by the invention In the conventional panel switch described above, the diameter of the hole 7 is generally slightly larger than the circumferential surface of the button 6 to account for dimensional variations. Moreover, if the buttons are of the same size and just touch each other, there is a risk that water droplets may get mixed in when the button 6 moves up and down (switch operation), so it is difficult to say that the drip-proofness is sufficient considering the structure. Ta.

(d) Means and action for solving the problem This invention was made to solve the above-mentioned drawbacks, using a rubber surface panel,
The part of the panel in contact with the head on the movable side of the switch is cut and glued to the head, and the thickness of the panel is at least 1/2 or more of the vertical movable length of the switch,
In other words, the panel and the head adhesive panel are always in contact with each other on their side surfaces, and furthermore, the contact is made under constant pressure due to the property of rubber that spreads in the direction of the cut surface due to the elasticity of rubber. This paper proposes a drip-proof structure for panel switches.

(e) Embodiment FIG. 1 is a side sectional view showing an embodiment of this invention, and the same numbers as in FIG. 3 indicate the same parts. Reference numeral 5' denotes a square or circular panel that contacts the head of the movable side 1b of the switch 1, and is cut and separated from the panel 5 and glued to the head. On the surface of this panel 5', marks such as symbols and letters are drawn to clearly indicate the role of the switch.

Due to the above-mentioned cutting, the panel 5' becomes wider than the diameter before cutting (for example, if it is circular), and on the other hand, the elasticity of the rubber acts so that the diameter of the cut hole becomes smaller in the panel 5, and both dimensions expand in the direction of the cut surface. . Therefore, when the panel 5' is glued to the head of the movable side 1b,
Both sides come into contact under constant pressure. Note that the panel 5 is bonded to the housing 3 to prevent it from turning over.

Next, Fig. 2 is a side sectional view of the main part showing the change in the position of the panel 5' relative to the panel 5 when the touch switch 1 is operated (up and down). (bottom).

In case A, the panel 5' protrudes from the upper surface of the panel 5, but is still partially in contact with the panel 5. The height of the panel 5 can be adjusted appropriately depending on the spacer 4 and the housing thickness. In the case of (b), although the panel 5' protrudes downward from the lower surface of the panel 5, a portion thereof is still in contact with the panel 5. Now, the vertical movable length of the switch is 2L (see Figure 2).
, the thickness of panels 5 and 5' is at least l
If it is thicker, the two can always be in contact with a constant pressure in any state, as shown in A and B.

(f) Effect of the invention As explained above, according to this invention, by using rubber panels, it is possible to utilize the elasticity of rubber that tends to spread in the direction of the cut surface. It is possible to apply a constant pressure to the contact between the two, and by setting the thickness of the panel to at least half the length of the vertical movement of the switch, it is possible to maintain contact between the two at all times under any state of the switch. drip-proof.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of this invention.
FIG. 2 is a side sectional view of the main part showing changes in the position of the panel 5'. FIG. 3 is a side sectional view illustrating a conventional structure. 1... Touch switch, 1a... Fixed side, 1b
...Movable side, 2...Printed wiring board, 3...Housing, 4...Spacer, 5, 5'...Panel,
7...hole.

Claims (1)

[Claims for Utility Model Registration] A hole is provided at an appropriate location in the housing of the device, and the switch is placed so that its head is located within the hole,
In the operation panel switch part, in which the head of the switch moves up and down in this hole when the head is pressed, the head of the switch has a thickness that is at least half of the vertical movable length of the switch, and the size of the head of the switch is at least half the length of the vertical movement of the switch. A display panel made of rubber that protrudes from the top surface of the switch is fixed to the top surface of the head of the switch, and has an edge corresponding to a peripheral edge of the display panel that has the thickness and is fixed to the head of the switch. A rubber display panel having the thickness described above is fixed to the housing so that the edge always contacts the peripheral edge of the display panel fixed to the head of the switch even when the switch moves up and down. Features a splash-proof structure of the panel.