JP2606513Y2 - Key top 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 swing type key top mounting structure used for a push button switch or the like.

[0002]

2. Description of the Related Art Conventionally, some key tops have a structure in which when the key top is pressed, the key top swings like a keyboard of a piano to turn on a switch contact disposed thereunder. Was.

FIG. 10A is a schematic side sectional view showing a mounting structure of a key top of this type. As shown in the figure, the key top 80 is provided with a support rod 83 (two support rods 83 on the near side and the back side of the sheet of FIG. And push rod 8
7 are protruded. A projection 85 for rotatably supporting the key top 80 in a groove (not shown) provided in the case 90 is provided at the tip of the support rod 83.

On the other hand, a switch board 91 is provided below the key top 80, and a click plate 93 is mounted on a top surface thereof at a position facing the push rod 87. Switch contacts are provided on the switch board 91 below the click plate 93.

When the key top body 81 is pressed in the direction of arrow a, the key top 80 rotates in the direction of arrow b around the protrusion 85 engaged with a groove (not shown) of the case 90, and The lower end of 87 presses the click plate 93 to turn on the switch contact thereunder.

[0006] By the way, the key top 80 having such a structure is used.
Is required to be located at the very end of the case 90 from the point of design and space, as shown in FIG.
The distance l to 7 has to be considerably shortened.

When the key top 80 needs to be further approached to the end of the case 90, as shown in FIG.
Need to be brought to the opposite side (left side) of the support rod 83.

[0008]

[Problem to be solved by the invention] However, the push rod 87
When the key top 81 is pressed in the direction of the arrow a, as shown in FIG. 11A, when the push rod 87 is brought close to the pivot axis of the key top 80, In addition, the tip of the push rod 87 moves in the direction of arrow c, that is, in the lateral direction rather than downward. For this reason, the click plate disposed below the push rod 87 and the switch contact thereunder cannot be pressed properly.

FIG. 12 is a diagram showing the movement trajectory of the tip of the push rod.
mm shows the position when lowered. As shown in the figure, the lower the push rod tip is closer to the swing center axis, and the longer the push rod length, the larger the lateral displacement of the push rod tip becomes when the same 0.3 mm is lowered. I understand. In other words, the problem is that the closer the push rod 87 approaches the pivot center axis, the more the push rod 8
The longer the length of 7 is, the more noticeable.

When the push rod 87 is mounted on the opposite side of the support rod 83, as shown in FIG. 11B, when the key top body 81 is pressed in the direction of the arrow a, the tip of the push rod 87 is moved. It moves in the direction of arrow d, that is, diagonally upward. For this reason, the click plate disposed below the push rod 87 and the switch contact thereunder cannot be pressed at all.

On the other hand, in these cases, the key top 8
If 0 is a push button structure, the click plate and the switch contact can be easily pressed. However, in this case, the keyboard-type rocking sensation of the piano cannot be obtained.

The present invention has been made in view of the above-mentioned point, and its object is to provide a piano keyboard-type swing feeling even if the push rod of the key top is mounted on the opposite side of the swing center axis. It is an object of the present invention to provide a key top mounting structure capable of operating the key top.

[0013]

In order to solve the above-mentioned problems, the present invention provides a key top provided with a pressing portion for pressing a switch contact, provided with a projection for supporting a shaft, and attaching the projection to a member other than the key top. In a key top mounting structure in which the key top is pivotally supported by a member other than the key top by being engaged with the provided groove or hole, the width of the groove or hole provided in the case is reduced. width substantially the same city protrusion of the key top as the key top of the protrusion is pivotable, and the length of the longitudinal key tops of the protrusions are formed so as vertical become vertically movable, further key The top pressing part is a key
Of the key top as viewed from the pivot axis of the
The projection which is attached to the opposite side and is engaged with the groove or hole is attached so that a gap is formed below the groove or hole in a state where the key top is not pressed, whereby the key top is When pressing, the protrusion is rotated while moving downward in the gap, so that the pressing portion
Is configured to press a switch contact disposed below the switch .

[0014]

The projection of the key top descends while rotating in the groove or hole of the case. Therefore, even if the push rod of the key top is mounted on the opposite side of the swing center axis, the switch contact can be reliably pressed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an exploded perspective view of an essential part showing one embodiment of the present invention. As shown in the figure, this embodiment includes a key top 10 and a case 40, and has projections 19, 19 (only one is shown in the figure) provided at the tip of the support rods 17, 17 of the key top 10. Supports 43, 4 provided on case 40
The third groove 45, 45 is swingably and vertically movable. Hereinafter, each component will be described.

FIG. 2A shows the key top 10 in FIG.
2 (b) is a cross-sectional arrow view showing a state in which the key top 10 is cut along the line BB shown in FIG.

As shown in FIG. 1 and FIG.
Reference numeral 0 indicates that a long push rod (pressing portion) 13 protrudes from the center of the lower surface of the key top main body 11 having a desired shape, and that support rods 17, 17 protrude from near both ends of the lower surface of the key top main body 11. It is configured. Projections 19, 19 project outward from the lower end outer surfaces of the support rods 17, 17, respectively.

FIG. 3 is an enlarged view of the projection 19, wherein FIG. 3 (a) is a perspective view and FIG.
Is a view of the projection 19 viewed from the direction C shown in FIG. 4A, and FIG. 4C is a view of the projection 19 viewed from the direction D shown in FIG.

As shown in FIG. 1, the projection 19 is formed by cutting the upper part of a cylinder into a flat shape to provide a flat surface 21, and by cutting the lower part diagonally to provide an inclined surface 23.

Here, as shown in FIG. 2C, the projection 19 is configured such that the lower part of the projection 19 has an arc of 180 ° or more.

Next, as shown in FIG. 1, the case 40 is provided on its upper surface with a rectangular hole 41 through which the push rod 13 of the key top 10 and the two support rods 17, 17 pass. I have.

FIG. 4A is a sectional view taken along the line E--E in FIG. 1, and FIG. 4B is a view of the hole 41 of the case 40 viewed from the back. As shown in FIG. 1 and FIG.
The lower surfaces of both ends of the 0 hole 41 are provided with rectangular columnar support bases 43 projecting downward.

Grooves 45, 45 are provided on the inner side faces of the support bases 43, 43, respectively. Here, the width of the grooves 45, 45 is the same as that of the protrusion 1 of the key top 10.
The diameter of the projections 19 is substantially the same as the diameter of the projections 19 so that the projections 9 and 19 can be rotated. It is formed to have a predetermined length in the vertical direction than the length in the vertical direction.

As shown in FIG. 1, the push rod 13 of the key top 10 and the support rods 17, 17 are inserted into holes 41 of the case 40.
And the projections 19, 19 at the tips of the support rods 17, 17 are engaged with the grooves 45, 45 of the case 40. At this time, since the projections 19, 19 are provided with the inclined surfaces 23, 23 (see FIG. 3), the case 40 can be easily inserted into the hole 41 and snapped in.

FIG. 5 is a schematic side sectional view showing a state in which the case 40 to which the key top 10 is attached is fixed on the substrate 60. FIG. 5A is a schematic side view in the direction shown in FIG. FIG. 2 (b) is a schematic sectional side view in the direction shown in FIG. 2 (b).

As shown in FIG. 1, the switch substrate 60 is configured by mounting a flexible substrate 63 on a resin base 61. A switch contact 65 is provided at a predetermined position of the flexible substrate 63, and a click plate 67 is mounted thereon. The lower end of the push rod 13 of the key top 10 abuts on the click plate 67.

That is, when the click plate 67 contacts the lower end of the push rod 13 of the key top 10, the key top 1
As a result, the projections 19 of the key top 10 abut against the upper ends of the grooves 45 of the case 40, and a predetermined gap w is formed between the key top body 11 and the upper surface of the case 40. .

Next, the operation of the key top 10 will be described. That is, the key top body 11 of the key top 10 shown in FIG. 5A is pressed in the direction of arrow F shown in FIG. As a result, the key top 10 attempts to rotate about the projection 19, but at the same time, the projection 19 is lowered because it is housed in the groove 45 of the case 40.

That is, as shown in FIG. 6, the projection 19 is lowered while rotating. At this time, since the lower half of the projection 19 has an arc shape over an angle of 180 ° or more, the turning operation can be performed smoothly.

Accordingly, as shown in FIG. 7, the key top 10 is entirely lowered while rotating around the projection 19, and the lower end of the push rod 13 is lowered while slightly moving in the lateral direction. The click plate 67 is pressed to invert it, and the switch contact 65 thereunder is turned on. In the case where the projection 19 does not descend but merely rotates, the lower end of the push rod 87 does not descend as shown in FIG.

When the pressing of the key top body 11 is released, the key top 10 is returned to the original position by the return force of the click plate 67, and the switch contact 65 is turned off.

The reason why the upper surface of the projection 19 is a flat surface 21 as shown in FIG. 3 is to increase the strength of preventing the key top 10 from coming off in the upward direction. That is, as shown in FIG. 5B, when the key top 10 is attached to the case 40, in the case of this embodiment, the flat surface 21 of the projection 19 and the case 4
The upper surface of the zero groove 45 comes into surface contact. Therefore, when the key top 10 is pulled up, the key top 10 is harder to come out of the case 40 than when the projection 19 is a cylinder.

FIG. 8 is a schematic side sectional view showing a reference example of the present invention. In the reference example shown in the figure, the same reference numerals are given to the same or corresponding parts as in the above embodiment, and the description thereof will be omitted.

[0034] This differs from the above embodiment in reference example, a point having a押桿13 of the key top 10 on the right side near the protrusion 19, case 40 on the lower surface right of the key top 10
The point that the claw 25 is locked to the lower surface of the hole 41 is provided, and the surrounding projection 50 is provided around the hole 41 of the case 40.

In the case of this reference example , when the key top body 11 is pressed in the direction of arrow G, the entire key top 10 pivots around the projection 19 and descends in the same manner as in the previous embodiment. As a result, the click plate 67 can be inverted, and the switch contact 65 thereunder can be turned on. In the case where the projection 19 only rotates without descending, FIG.
As described above, the lower end of the push rod 87 hardly descends as shown in FIG.

On the other hand, in the case of this reference example , since the claw 25 is provided on the key top 10, when the key top 10 is returned to the original position by the resilience of the click plate 67, the claw 25 is The engagement with the lower surface of the hole 41 restricts the upward movement of the key top 10 and prevents the key top 10 from coming off the case 40.

In this embodiment , the surrounding projection 50 is provided on the case 40 because the light source is arranged between the case 40 and the substrate 60 and the key top body 11 is moved from the lower surface side through the hole 41 of the case 40. This is to prevent light from leaking from the gap W generated between the key top main body 11 and the case 40 when trying to illuminate.

As shown in FIG. 9, a translucent resin plate 53 may be inserted into a gap between the key top 10 and the substrate 60. The resin plate 53 guides light from a light source (not shown) to the key top 10. At this time, if the outer surface of the projecting portion 53a of the resin plate 53 is made to be close to the inner side surface of the support rods 17 of the key top 10 as shown in FIG. There is no danger of coming off and falling out.

If a sponge 55 is inserted between the resin plate 53 and the case 40 as shown in the figure, the sponge 55 acts to push up the projection 19 of the key top 10 in the upward direction. Can be held in a fully pushed state.

In each of the above embodiments, the case 40
A groove 45 is provided in the groove 45 and the projection 19 of the key top 10 is
However, the groove 45 may not be open at the lower end, and may be a hole instead of the groove. In short, the width of the key top projection is made approximately the same as the width of the key top projection so that the key top projection can rotate, and the vertical length is formed vertically long so that the key top projection can move up and down. Any groove or hole may be used.

The projection 19 of the key top 10 may be configured so that the angle θ of the lower portion thereof is an arc of 180 ° or more, and the angle θ may be 360 °. In this case, the plane 21 shown in FIG. 3 disappears.

It is needless to say that the present invention may be used for mounting a normal key top other than the key top located at the very edge of the case. In this case, when the keytop is pressed, a rocking sensation like a piano keyboard and a vertical pressing sensation are simultaneously felt. In other words, a keytop with a new operation feeling can be configured.

As described in detail above, according to the key top mounting structure of the present invention, even if the push rod (pressing portion) of the key top is mounted on the opposite side of the pivot axis of the key top. In addition, it has an excellent effect that the switch contact can be reliably turned on and off with a new operation feeling of simultaneously feeling the swinging feeling and the pressing feeling in the vertical direction like a keyboard of a piano.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part showing one embodiment of the present invention.

FIG. 2 is a view showing a key top 10;

FIG. 3 is an enlarged view showing a protrusion 19;

FIG. 4 is a view showing a portion of a hole 41 of a case 40.

FIG. 5 is a view showing a state in which a case 40 to which the key tops 10 are attached is fixed on a substrate 60.

FIG. 6 is a diagram for explaining the operation of a projection 19;

FIG. 7 is a diagram for explaining the operation of the key top 10;

FIG. 8 is a schematic side sectional view showing a reference example of the present invention.

FIG. 9 is a schematic side sectional view showing another reference example of the present invention.

FIG. 10 is a schematic side sectional view showing a conventional key top mounting structure.

FIG. 11 shows a push rod 87 when the key top body 81 is pressed.
It is a figure which shows operation | movement.

FIG. 12 is a diagram showing a movement locus of a push rod tip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Key top 13 Push rod 19, 19 Projection 40 Case 45, 45 Groove 65 Switch contact

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 21/00

Claims (2)

(57) [Scope of request for utility model registration] A key top provided with a pressing portion for pressing a switch contact is provided with a projection for supporting a shaft, and the projection is engaged with a groove or a hole provided in a member other than the key top so that the key top is keyed. In a key top mounting structure pivotally supported on a member other than the top, the groove or hole provided in the case has a width such that a protrusion of the key top is rotatable. The width of the projection is substantially the same, and the length in the vertical direction is formed to be vertically long so that the projection of the key top can move up and down .
On the side opposite to the side where the key top is lowered
At the same time, the projection engaged with the groove or hole is attached so that a gap is formed below the groove or hole in a state where the key top is not pressed, so that when the key top is pressed. Is installed below the pressing portion by rotating while the projection moves downward in the gap .
A key top mounting structure characterized by pressing a switch contact . 2. The key top mounting according to claim 1, wherein at least a portion of the outer peripheral surfaces of the two projections provided on the key top and in contact with the groove or the hole is formed in an arc shape. Construction.