JPH0552006B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a flat keyboard switch with an improved structure when fixing a transparent and elastic flat keyboard switch body and a transparent reinforcing plate that reinforces the main body to a case. This is related to keyboard switches.

[Prior art]

Fig. 1 is a diagram showing the structure of a transparent flat keyboard switch body made of a conventional film base material when attached to a case; 1 is a frame-shaped case;
2 is a flat keyboard switch body that contacts the inner surface of the case 1; 3 is a reinforcing plate that is a rigid body that supports the flat keyboard switch body 2; 4 is a flat keyboard switch body 2 and the reinforcing plate 3 are fixed to the case 1. 5 is a gasket to be inserted between the frame 4 and the reinforcing plate 3, and 6 is a tightening screw.

The structure for attaching the conventional transparent flat keyboard switch body to the case is constructed as described above, and when pressure is applied from the outside to the transparent flat keyboard switch body 2, the main body 2 of the transparent flat keyboard switch is made of a film base material. It is displaced a certain distance downward and the switch is turned on. Further displacement does not occur because the transparent reinforcing plate 3, which is a rigid body, receives pressure. Conversely, if the pressure decreases, the displacement will return to its original state and it will eventually turn off. In this manner, the flat keyboard switch body 2 is operated by the displacement of the film base material.

On the other hand, in this mounting method in which the case 1, the flat keyboard switch body 2, and the reinforcing plate 3 are fixed around the periphery, each component expands and contracts by a size proportional to the coefficient of thermal expansion when the ambient temperature changes.

The materials of each part are generally metal for the case 1, polyester film for the flat keyboard switch body 2, and acrylic for the reinforcing plate 3. The case 1 and the flat keyboard switch main body 2 have almost the same coefficient of thermal expansion, but there is a difference of about twice as much as that of the reinforcing plate 3, with the reinforcing plate 3 being larger.

If the case 1, the flat keyboard switch main body 2, and the reinforcing plate 3 are firmly tightened and fixed at their peripheral edges, the positions of the fixing points of the three will hardly change due to changes in ambient temperature. However, in other areas, the flat keyboard switch main body 2 and the reinforcing plate 3, especially the latter having a large coefficient of thermal expansion, are subject to dimensional changes.

When the temperature is high, the reinforcing plate 3 expands more, but since the peripheral end is strongly fixed to the case 1, it deforms into an arched shape. The direction will be toward the flat keyboard switch main body 2 or vice versa, depending on the history.

In the case of low temperature, if the shrinkage force of the reinforcing plate 3 is strong enough to deform the case 1, the flat keyboard switch body 2 will be relatively longer than the reinforcing plate 3, and deflection will occur accordingly. do.

In the above-mentioned mounting structure in which the three parts are strongly fixed at the peripheral edges, for example, when the temperature rises, the reinforcing plate 3 will warp, causing the entire flat keyboard switch body 2 to bend or be stretched. This will significantly deteriorate the appearance and operability.

Conversely, when the temperature becomes low, the reinforcing plate 3 contracts, causing the entire flat keyboard switch body 2 to flex.

As described above, this fixed structure has the disadvantage that the appearance and operability of the flat keyboard switch main body 2 change significantly due to changes in ambient temperature.

[Summary of the invention]

This invention was made for the purpose of improving this drawback, and a rigid body having a coefficient of thermal expansion similar to that of the flat keyboard switch body is bonded between the case and the reinforcing plate at the overlapped part of the case and the reinforcing plate. By inserting a flat keyboard switch body and integrating the movement of the flat keyboard switch body with a rigid body, we propose a transparent elastic flat keyboard switch whose appearance and operability do not change even with changes in ambient temperature. It is something to do.

[Embodiments of the invention]

FIG. 2 is a diagram showing an embodiment of this invention,
1 to 6 are almost the same as the conventional ones. Reference numeral 7 denotes a metal plate having a coefficient of thermal expansion similar to that of the base material of the flat keyboard switch body 2, which is bonded to the flat keyboard switch body 2 corresponding to the overlapping portion of the case 1 and the reinforcing plate 3.・A rigid body such as a glass plate, 8 is a spacer portion fixed to the case 1 and whose dimensions are greater than the thickness of the flat keyboard switch body 2 and the rigid body 7, and 9 is a spacer portion 8 whose dimensions are greater than the thickness of the reinforcing plate 3. 10 is a threaded part that continues from the pole part 9, 11 is a spacer part 8, the pole part 9, and the threaded part 1.
Frame a consisting of 0, 12 is a hole corresponding to the pole part 9 provided in the reinforcing plate 3, and its diameter is sufficiently larger than the pole part 9. 13 supports the reinforcing plate 3 via the pole part 9. This is Natsuto.

In the method of attaching the transparent elastic flat keyboard switch body 2 constructed as described above, the operation of the flat keyboard switch body 2 depends on the presence or absence of external pressure.

There is a contact point on the flat keyboard switch body 2.
When a pressure greater than the force required to turn on is applied, the flat keyboard switch main body 2 is further displaced downward by the thickness of the rigid body 7 due to the extra force.
However, if the displacement exceeds this level, the hard transparent reinforcing plate 3 located under the flat keyboard switch main body 2
Therefore, it will not occur and will be regulated.

In this mounting structure, the flat keyboard switch body 2 with the rigid body 7 and the reinforcing plate 3 are connected to the 1 part of the case 1.
For example, determine the position at the bottom of the four sides of case 1 shown in Fig. 2a, and place 2 on the bottom.
The two corners 14 are fixed with screws 6 in the same manner as the conventional one shown in FIG.
The reinforcing plate 3 is slidably supported at one corner 15 by a nut 13 fastened to the frame a11. In this case, the corner portion 14 serves as a fixed portion, and the corner portion 15 serves as a movable mounting portion. And case 1
A space larger than the thickness of the flat keyboard switch body 2 with the rigid body 7 attached is provided between the flat keyboard switch body 2 and the reinforcing plate 3, and the flat keyboard switch body 2 is arranged within this space. At this time, the flat keyboard switch body 2 with the rigid body 7 is attached to the corner 1.
Only the portion corresponding to 4 is fixed together with the case 1 and the reinforcing plate 3 with screws 6, and the other portions are merely placed in contact with the reinforcing plate 3. Further, the pole portion 9 is set so that a clearance always exists between the reinforcing plate 3 and the spacer 8 even when the nut 13 is tightened. When sandwiching the flat keyboard switch main body 2 between the case 1 and the reinforcing plate 3 and fixing it at the bottom with the screws 6, use the rigid body 7.
are sandwiched therein, and the flat keyboard switch main body 2 is supported and reinforced by this rigid body 7. Further, the reinforcing plate 3 is attached to the case 1 in such a manner that it can change in the horizontal direction by the diameter of the hole 12 except for the bottom side, thereby forming a movable attachment part.

Therefore, for example, when the ambient temperature becomes high, the reinforcing plate 3 made of a plastic material with a large coefficient of thermal expansion, such as an acrylic plate, expands further than the case 1 as in the past, but the reinforcing plate 3 is not fixed to the case 1 in the movable mounting part. Since it is simply supported by the nut 13 and the diameter of the hole 12 is sufficiently larger than the diameter of the pole 9, the expansion of the case 1 and the reinforcing plate 3 in the direction from the corner 14 to the corner 15 of the reinforcing plate 3 is Even if a difference occurs, the reinforcing plate 3 simply slides on the nut 13 and its movement is not suppressed, so that the reinforcing plate 3 does not warp. Furthermore, at this time, the flat keyboard switch main body 2 and the rigid body 7 also expand to different dimensions from the reinforcing plate 23, but as mentioned above, the rigid body 7 is fixed to the reinforcing plate 3 only by the corner part 14, which is the fixed part. , and the other parts are only placed in contact with the reinforcing plate 3,
The portions other than the bottom portion between the fixed portions move independently of the reinforcing plate 3, thereby preventing the flat keyboard switch main body 2 from warping or bending.

Conversely, when the temperature becomes low, the reinforcing plate 3 contracts more, but since it moves in the same manner as described above, the flat keyboard switch body 2 is not affected at all.

In the above embodiment, the rigid body 7 is provided on each side of the flat keyboard switch body 2, but this is also possible by providing the rigid body 7 only on one side of the reinforcing plate 3, which uses the frame a11 to ensure that there is always a clearance. It's okay.

〔Effect of the invention〕

As explained above, this invention attaches a rigid body having a coefficient of thermal expansion similar to that of the main body of a flat keyboard switch, partially fixes the main body of the flat keyboard switch to a reinforcing plate, and
The reinforcing plate is held in the case by a fixed part that fixes the reinforcing plate to the case, and a movable mounting part that attaches the reinforcing plate so that it can easily move in the direction of the plate surface, so that the reinforcing plate is held in place by a fixed part that fixes the reinforcing plate to the case. This has the effect of suppressing deterioration of the appearance and operability of the keyboard switch and maintaining it in good condition.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a conventional flat keyboard switch, in which a is a plan view and b is a vertical sectional view. Fig. 2 is a view showing an embodiment of the present invention, in which a is a plan view and b
is a vertical sectional view, and c is an enlarged partial view thereof. In the figure, 1 is the case, 2 is the flat keyboard switch body, 3 is the reinforcing plate, 4 is the frame, and 5
1 is a packing, 6 is a screw, 7 is a rigid body, 8 is a spacer part, 9 is a pole part, 10 is a screw part, 11 is a frame a, 12 is a hole, and 13 is a nut. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] 1 A transparent and elastic flat keyboard switch body, a reinforcing plate provided on the underside of this flat keyboard switch body, and a frame with punched holes provided at locations corresponding to the switch portion of the flat keyboard switch body. A flat keyboard switch is provided with a case that holds the flat keyboard switch main body and the reinforcing plate, which has a thermal expansion coefficient similar to that of the flat keyboard switch main body, and has a thermal expansion coefficient similar to that of the flat keyboard switch main body, The flat keyboard switch body is affixed to the flat keyboard switch body at a portion between the reinforcing plate and the part corresponding to the case to support the flat keyboard switch body, and is at least partially fixed to the reinforcing plate at one end side. a rigid body, a fixing part that at least partially fixes the reinforcing plate and the case on a fixed side of the rigid body and the reinforcing plate, and a fixing part that fixes the reinforcing plate to the case in a direction opposite to an end side of the fixing part. A flat keyboard switch characterized in that the reinforcing plate is held on the case by a movable mounting part that is displaceably mounted on the case.