JP2001337678A - Keyboard device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To build a switch component in stable conditions. SOLUTION: A switch component 3 consists of a rubber sheet 10 with a centroclinal evaginater 12 which inserts from the bottom into a through-hole set in a keyboard chassis 1, and a switch board 11 placed at the bottom side of the keyboard chassis 1 via this rubber sheet 10, and the first and second guide projections 25 and 26 are laid on the keyboard chassis 1 in order to prevent the switch board 11 from abutting the rubber sheet 10 while building the switch board 11. As the first and second guide projections 25 and 26 guide the switch board 11 so as not to contact with the rubber sheet 10, it is made possible to avoid displacement caused by the rubber sheet 10 getting stuck with the switch board 11 like the conventional devices, and to precisely build the switch component 3 in stable conditions accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a keyboard device for an electronic keyboard instrument such as an electronic piano.

[0002]

2. Description of the Related Art Conventionally, in an electronic keyboard musical instrument such as an electronic piano, a plurality of keys arranged in parallel on a keyboard chassis in an instrument case are depressed to operate a switch member provided on the keyboard chassis. It is configured to generate a musical sound when turned on. 17 to 20 are diagrams showing one example. As shown in FIG. 17, this electronic keyboard musical instrument has a keyboard chassis 1 integrally formed with a musical instrument case.
A plurality of keys 2 mounted on the keyboard chassis 1 so as to be vertically rotatable and arranged in parallel, and a switch member 3 provided on the keyboard chassis 1 and pressed by the plurality of keys 2. ing.

The plurality of keys 2 are composed of a white key and a black key, each having a thin elastic deformation portion 4 formed at its rear portion (right end in FIG. 17). The common chassis 5 is connected to the common connecting portion 5 along the key arrangement direction in a state where the white keys and the black keys are arranged in parallel. The connecting portions 5 are superimposed on the white keys and the black keys, respectively. It is configured to be mounted on the key mounting portion 6 by a screw 7, thereby rotating vertically about the respective elastically deforming portions 4. In this case, each key 2 is formed with a pressing portion 8 for pressing the switch member 3 in accordance with a key pressing operation, in a state protruding below the key 2.

The switch member 3 includes a rubber sheet 10 and a switch board 11, and is arranged on the lower surface of the keyboard chassis 1 at an intermediate portion. The rubber sheet 10 is shown in FIG.
As shown in FIG. 17, a dome-shaped bulging portion 12 which can be elastically deformed at a position corresponding to the pressing portion 8 of each key 2 as shown in FIG. These bulging portions 12 are inserted from below into each through hole 13 provided in the keyboard chassis 1, and each upper end portion is configured to elastically contact the lower surface of the pressing portion 8 of each key 2. ing. As shown in FIGS. 17 and 18, one end (the left end 11a in FIG. 17) of the switch board 11 is locked by a locking portion 14 provided on the lower surface of the keyboard chassis 1, and the other end is provided. The screw hole 15a provided in the right end portion 11b of the keyboard chassis 1 corresponds to the boss portion 15b of the keyboard chassis 1. In this state, the right end portion 11b of the switch board 11 is screwed by the screw 15.
b is attached to the boss portion 15b of the keyboard chassis 1, thereby sandwiching the rubber sheet 10 on the lower surface of the keyboard chassis 1.

In this case, each bulging portion 12 of the rubber sheet 10 is
17, a movable contact 16 is provided, and a pair of fixed contacts 17 are provided on the upper surface of the switch board 11 so as to correspond to each movable contact 16.
As a result, when the bulging portion 12 of the rubber sheet 10 is pressed by the pressing portion 8 of the key 2, the bulging portion 12 is elastically deformed, and the movable contact 16 inside the switch member 3 The pair contacts the pair of fixed contacts 17 to output a switch signal. Also, this switch member 3
When the key is released, the bulging portion 12 causes the key 2
Is pushed up to separate the movable contact 16 from the pair of fixed contacts 17. The switch member 3 has a length corresponding to, for example, the key 2 corresponding to one octave.

The plurality of keys 2 are urged upward by the respective elastic forces of the respective bulging portions 12 of the rubber sheet 10 and the elastically deforming portions 4 of the respective keys 2, and the front sides of the respective keys 2 (FIG. 17). The L-shaped stopper piece 18 provided on the left side) contacts the upper limit stopper 20 such as a felt provided on the lower surface of the keyboard chassis 1 through the stupid hole 19 of the keyboard chassis 1, whereby the key 2 is moved to the predetermined upper limit. The position is restricted to the position (initial position). When the key 2 is depressed, the stopper piece 18 abuts against a lower limit stopper 21 such as a felt provided on a lower portion of the keyboard chassis 1, thereby restricting the key 2 to a predetermined lower limit position. Have been. Furthermore, key 2 is
The lateral swing of the key 2 is regulated by the white key guide 22 and the black key guide 23 provided on the keyboard chassis 1.

[0007]

In such an electronic keyboard instrument, when the switch member 3 is assembled to the keyboard chassis 1, first, as shown in FIGS. The protrusion 12 is inserted into each through hole 13 of the keyboard chassis 1 from below, and the rubber sheet 10 is arranged on the lower surface of the keyboard chassis 1. In this state,
The switch substrate 11 is tilted downward to the right at a predetermined angle, and the left end 11a of the tilted switch substrate 11 is
Locking portion 1 of keyboard chassis 1 while sliding along the lower surface of
4 and lock it. Thereafter, the switch board 11
The switch board 11 is turned upward around the left end 11 a of the keyboard chassis 1 and disposed on the lower surface of the keyboard chassis 1 via the rubber sheet 10. In this state, the other end 11b of the switch board 11 is attached to the boss 15b of the keyboard chassis 1 with screws 15.

However, in such an electronic keyboard instrument, the left end portion 11a of the switch board 11 is
Locking portion 1 of keyboard chassis 1 while sliding along the lower surface of
4, the left end 11a of the switch board 11
May catch the left end of the rubber sheet 10, for example, the left inner edge of the bulging portion 12 and displace the rubber sheet 10. In such a case, the left end of the rubber sheet 10 cuts into the locking portion 14 of the keyboard chassis 1 together with the left end 11a of the switch board 11, and the switch board 11 cannot be securely fixed, or the rubber sheet 10 The dome-shaped bulge 12 abuts on the edge of the through hole 13 of the keyboard chassis 1 and deforms, causing problems such as a malfunction in the switch function and a deterioration in key pressing characteristics.

An object of the present invention is to enable a switch member to be accurately assembled in a stable state.

[0010]

According to the present invention, there is provided a keyboard chassis, a key provided on the keyboard chassis so as to be vertically rotatable, and a key provided on the keyboard chassis in response to a key pressing operation of the key. A keyboard member having a dome-shaped bulge inserted from below into a through hole provided in the keyboard chassis corresponding to the key. A seat, and a switch board disposed on the lower surface of the keyboard chassis via the rubber sheet. When the switch board is assembled with the keyboard chassis, the switch board contacts the rubber sheet. It is characterized in that a guide projection is provided for prevention.

According to this invention, the dome-shaped bulge of the rubber sheet is inserted from below into the through hole of the keyboard chassis, and the rubber sheet is arranged on the lower surface of the keyboard chassis. When assembling, the guide projections provided on the keyboard chassis guide the switch board so as not to contact the rubber sheet, so that the rubber sheet can be prevented from being displaced by being caught on the switch board as in the conventional case, Thereby, the switch member can be accurately assembled in a stable state. in this case,
As described in claim 2, the guide projection has an elastic hook portion that locks the switch board when the switch board is disposed on the lower surface of the keyboard chassis via the rubber sheet. The switch member can be attached to the keyboard chassis without using screws or the like, so that the attachment operation can be facilitated.

According to a third aspect of the present invention, there is provided a keyboard chassis, a key provided on the keyboard chassis so as to be rotatable in a vertical direction, and a key provided on the keyboard chassis for pressing a key. A keyboard member having a dome-shaped bulge inserted from below into a through hole provided in the keyboard chassis corresponding to the key. Rubber sheet,
A switch board disposed on the lower surface of the keyboard chassis via the rubber sheet, wherein the rubber sheet has a sliding direction on the side of the switch board when the switch board slides and is assembled to the keyboard chassis. A projection is provided at a position distant from an end of the rubber sheet, the position being regulated by a regulation portion provided on the keyboard chassis.

According to the present invention, since the protrusion is provided at a position apart from the end of the rubber sheet located on the slide direction side of the switch board, the switch board is slid along the lower surface of the rubber sheet to thereby produce a keyboard chassis. Even when the switch board is hooked on the end side of the rubber sheet located on the slide direction side when the switch board is assembled, the protrusion can be kept away from the end side of the hooked rubber sheet, thereby the protrusion of the rubber sheet. It is possible to make the portion hard to come off from the regulating portion of the keyboard chassis, so that the position of the rubber sheet can be surely regulated to a predetermined position, so that the switch member can be accurately assembled in a stable state.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of a keyboard device according to the present invention will be described below with reference to FIGS. The same parts as those of the conventional example shown in FIGS. In this keyboard device, guide protrusions 25 and 26 for guiding the switch board 11 are provided on the lower surface of the keyboard chassis 1, and the guide protrusions 25 and 26 are provided on the rubber sheet 10 and the switch board 11.
26 is provided with fitting holes 27 to 29 for fitting, and other than this, the structure is almost the same as the conventional example.

That is, of the guide projections 25 and 26,
As shown in FIGS. 5 and 7, the first guide projection 25
The left end 11 a of the switch board 11 is guided toward the locking portion 14 of the keyboard chassis 1. As shown in FIG. 2, the first guide projection 25 is located between the through holes 13 on the lower surface of the keyboard chassis 1 and near the locking portion 14 in the direction in which the through holes 13 are arranged. 2 are provided at predetermined intervals, for example, at intervals of about three through holes 13 as shown in FIG. Also, the second guide projection 26
Is for guiding the right end 11 b of the switch board 11, and is provided on the lower surface of the keyboard chassis 1 at a position located on the right side of the through hole 13 in correspondence with the first guide projection 25. In this case, the first and second guide projections 2
As shown in FIG. 5, the second guide projections 26 are used to tilt the switch board 11 downward at a predetermined angle.
The height of the first guide projection 25
Longer than the first and second guide projections 25,
Each of the tip surfaces 26 is formed as a downwardly inclined surface.

When the rubber sheet 10 is disposed on the lower surface of the keyboard chassis 1 as shown in FIG.
A fitting hole 27 into which the guide projection 25 fits is provided near the left side as shown in FIG. When the dome-shaped bulging portion 12 is pressed on the lower surface of the rubber sheet 10, that is, the surface facing the switch substrate 11,
Air vent grooves 30 for releasing the air inside are provided vertically and horizontally. Further, as shown in FIG. 7, the switch board 11 has the left end 11a inserted into the locking portion 14 of the keyboard chassis 1, and the switch board 1
When the right end 11b of the first guide projection 2 is attached to the lower surface of the keyboard chassis 1 with the screw 15, the first and second guide projections 2
As shown in FIG. 4, fitting holes 28 and 29 in which the fittings 5 and 26 are fitted are provided near both sides of the left side and the right side.

In such a keyboard device, the keyboard chassis 1
When assembling the switch board 11 on the lower surface of the keyboard chassis, first, as shown in FIG. 5, each of the dome-shaped bulging portions 12 of the rubber sheet 10 is inserted into each of the through holes 13 of the keyboard chassis 1 from below. The seat 10 is arranged on the lower surface of the keyboard chassis 1. At this time, the first guide projection 25 of the keyboard chassis 1 is inserted into the fitting hole 27 of the rubber sheet 10, so that the rubber sheet 10 is positioned on the lower surface of the keyboard chassis 1. In this state, the left end portion 11a of the switch substrate 11 is brought into contact with the distal end surface of the first guide projection 25 as shown by a two-dot chain line in FIG. 5, and then, as shown by a solid line in FIG. Is brought into contact with the distal end surface of the second guide projection 26. Then, the switch board 11
Are inclined rightward and downward at a predetermined angle by the first and second guide projections 25 and 26. At this time, as shown in FIG. 6, the fitting holes 28 and 29 of the switch board 11 are made to correspond to the first and second guide projections 25 and 26 along the sliding direction of the switch board 11.

In this state, the switch board 11 is slid to the left in FIG. 5, and the left end 11a of the switch board 11 is inserted into the locking portion 14 of the keyboard chassis 1 as shown in FIG. At this time, since the switch board 11 is guided by the first and second guide protrusions 25 and 26, the switch board 11 does not contact the rubber sheet 10. When the left end portion 11a of the switch board 11 is inserted into the locking portion 14, the fitting holes 28 and 29 of the switch board 11 are inserted into the first and second guide projections 25 of the keyboard chassis 1 as shown in FIG. , 26, so that FIG.
As shown by a two-dot chain line in FIG.
When the switch board 11 is rotated upward around the center 1a, the first and second guide projections 25 and 26 of the keyboard chassis 1 are fitted into the fitting holes 28 and 29 of the switch board 11, respectively. As a result, the switch board 11 is positioned with respect to the keyboard chassis 1, and in this state, the switch board 11 is disposed on the lower surface of the keyboard chassis 1 via the rubber sheet 10. Thereafter, the right end 11b of the switch board 11 is screwed to the boss 15 of the keyboard chassis 1 as shown in FIG.
b, the switch board 11 is attached to the keyboard chassis 1
The rubber sheet 10 is sandwiched between the lower surfaces of the rubber sheets.

As described above, according to this keyboard device, since the first and second guide projections 25 and 26 are provided on the lower surface of the keyboard chassis 1, each dome-shaped bulging portion 12 of the rubber sheet 10 is provided.
Is inserted into each through hole 13 of the keyboard chassis 1 to dispose the rubber sheet 10 on the lower surface of the keyboard chassis 1, and when the switch board 11 is assembled to the keyboard chassis 1 in this state,
The switch board 11 can be guided by the first and second guide projections 25 and 26 of the keyboard chassis 1 so as not to come into contact with the rubber sheet 10, whereby the rubber sheet 10 is caught on the switch board 11 and displaced as in the conventional case. Can be prevented, and the rubber sheet 10 and the switch board 11 can be positioned with respect to the keyboard chassis 1 by the first and second guide projections 25 and 26, whereby the rubber sheet 10 and the switch board 11 can be positioned. It is easy and accurate to assemble, so that a stable switch function and stable key pressing characteristics can be secured.

In the first embodiment, the case where the first and second guide protrusions 25 and 26 are provided on the lower surface of the keyboard chassis 1 has been described. However, the first and second guide protrusions 25 and 26 are necessarily provided. There is no necessity, and a structure in which only the first guide protrusion 25 located on the left end portion 11a side of the switch board 11 may be provided. In this case, it is desirable that the first guide protrusion 25 be formed long in the front-back direction of the keyboard chassis 1, that is, in the sliding direction of the switch board 11. In the first embodiment, the first and second guide protrusions 25 and 26 are provided.
Although the tip end surface is formed on an inclined surface, it is not always necessary to form the end surface on an inclined surface, and it may be an arc surface or a horizontal flat surface. It may be.

[Second Embodiment] Next, a keyboard device according to a second embodiment of the present invention will be described with reference to FIGS. In this case, the same parts as those in the first embodiment shown in FIGS. The keyboard device includes an elastic hook portion 3 instead of the second guide protrusion 26 located on the right side of the first and second guide protrusions 25 and 26.
1 and the other structure is substantially the same as that of the first embodiment. The elastic hook portion 31 has a function of locking the right end 11b of the switch board 11 in addition to a function of guiding the right end 11b of the switch board 1, and is provided on the lower surface of the keyboard chassis 1.

That is, when the switch board 11 is disposed on the lower surface of the keyboard chassis 1, the elastic hook portion 31 is located at a position corresponding to the right end 11 b of the switch board 11, that is, in the second embodiment, No boss part 1
At a position located on the right side of 5b, the keyboard chassis 1 is provided so as to be elastically deformable in the front-rear direction (the left-right direction in FIGS. 9 and 10) in a state corresponding to the first guide projection 25. In this case, the elastic hook portion 31 is
5, the switch board 11 is inclined downward to the right so that when the switch board 11 is disposed on the lower surface of the keyboard chassis 1, the switch board 11 is elastically deformed to engage the right end 11b of the switch board 11. It is configured to stop. The switch board 11 is provided with a fitting hole 28 into which the first guide protrusion 25 is fitted, but is not provided with the fitting hole 29 and the screw hole 15a of the first embodiment.

In such a keyboard device, the rubber sheet 10
When the rubber sheet 10 is arranged on the lower surface of the keyboard chassis 1 by inserting the respective dome-shaped bulging portions 12 into the respective through holes 13 of the keyboard chassis 1 and the switch board 11 is assembled to the keyboard chassis 1 in this state, After the left end 11a of the switch board 11 is brought into contact with the distal end surface of the first guide projection 25 as shown by the two-dot chain line in FIG. 9, the right end 11b of the switch board 11 is made as shown by the solid line in FIG. The upper surface on the side is brought into contact with the tip of the elastic hook portion 31, and the switch substrate 11 is moved to the first position.
The guide projection 25 and the elastic hook portion 31 incline at a predetermined angle downward to the right. At this time, as shown in FIG. 9, the fitting hole 28 of the switch board 11 is made to correspond to the first guide projection 25 along the sliding direction of the switch board 11. In this state, the switch board 11 is slid to the left in FIG. 9, and as shown in FIG.
The left end 11 a of the switch board 11 is inserted into the locking portion 14 of the keyboard chassis 1.

At this time, since the switch board 11 is guided by the first guide projections 25 and the elastic hook portions 31, the switch board 11 does not come into contact with the rubber sheet 10 as in the first embodiment. Then, when the left end portion 11a of the switch board 11 is inserted into the locking portion 14, as shown in FIG.
Reference numeral 8 corresponds to the first guide projection 25 of the keyboard chassis 1, and corresponds to the elastic hook portion 31 on the right end 11 b of the switch board 11. In this state, as shown by a two-dot chain line in FIG.
When the switch board 11 is turned toward the lower surface of the keyboard chassis 1, the first guide projection 25 is fitted into the fitting hole 28, and the right end 11b of the switch board 11 is moved rearward of the elastic hook portion 31 (see FIG. In this case, the elastic hook portion 31 is elastically deformed (to the right) and gets over, and the elastic hook portion 31 is elastically restored to lock the right end portion 11b of the switch board 11. As a result, as shown in FIG.
The rubber sheet 10 is sandwiched between the lower surfaces of the rubber sheets.

As described above, this keyboard device has the same operation and effect as the first embodiment. In particular, since the elastic hook portion 32 is provided instead of the second guide projection 26, the left end portion 11a of the switch board 11 is provided. To the locking portion 14 of the keyboard chassis 1
When the switch board 11 is disposed on the lower surface of the keyboard chassis 1 in a state where the switch board 11 is locked, the elastic hook portion 31 is elastically deformed and locks the right end 11b of the switch board 11, so that the first embodiment is different from the first embodiment. Like, without using screw 15 etc.
The switch board 11 can be easily mounted on the lower surface of the keyboard chassis 1, thereby facilitating the mounting operation.
In addition, since it is not necessary to provide the switch substrate 11 with the fitting hole 29 of the second guide protrusion 26 and the screw hole 15a of the screw 15, the structure of the switch substrate 11 can be simplified.

Third Embodiment Next, FIG. 13 and FIG.
With reference to FIG. 4, a third embodiment of the keyboard device of the present invention will be described. In this case, the same parts as those of the conventional example shown in FIGS. This keyboard device has a structure in which a projection 35 is provided on the rubber sheet 10 of the switch member 3 and a regulating portion 36 for regulating the position of the projection 35 of the rubber sheet 10 is provided on the keyboard chassis 1. It has the same structure.

That is, the protrusion 35 of the rubber sheet 10
The right side of the dome-shaped bulging portion 12 of the rubber sheet 10, that is, as shown in FIG.
As shown in FIG. 14, at a predetermined distance along the direction in which the keys 2 are arranged, at a position away from the left end of the rubber sheet 10 located on the sliding direction side when the keyboard 1a is inserted into the locking portion 14 of the keyboard chassis 1, as shown in FIG. Is provided. In addition, keyboard chassis 1
As shown in FIG. 19, when the bulging portion 12 of the rubber sheet 10 is inserted into the through hole 13 from below, the regulating portion 36 is a hole or a concave portion into which the protrusion 35 of the rubber sheet 10 fits. In addition, as shown in FIG. 13, it is located near the right side of the through-holes 13 and is provided at predetermined intervals along the arrangement direction of the through-holes 13.

In such a keyboard device, the rubber sheet 10
When the rubber sheet 10 is disposed on the lower surface of the keyboard chassis 1 by inserting the bulging portion 12 of the keyboard chassis 1 into the through hole 13 of the keyboard chassis 1 from below, the projection 35 of the rubber sheet 10 fits into the regulating portion 36 of the keyboard chassis 1. Therefore, the switch board 10 can be positioned on the lower surface of the keyboard chassis 1. In this state, when assembling the switch board 11 to the keyboard chassis 1, as shown by a two-dot chain line in FIG.
1 is slid along the lower surface of the rubber sheet 10 and inserted into the locking portion 14 of the keyboard chassis 1. At this time, for example, even if the left end 11a of the switch board 11 is hooked on the left end of the rubber sheet 10, the rubber sheet 10
The protrusion 35 is fitted into the regulating portion 36 of the keyboard chassis 1 to regulate the position of the rubber sheet 10, so that the entire rubber sheet 10 can be prevented from being displaced with respect to the keyboard chassis 1.

That is, since the protrusion 35 is provided on the right side of the bulging portion 12 of the rubber sheet 10, that is, at a position distant from the left end of the rubber sheet 10 located on the slide direction side of the switch substrate 11, the switch substrate 11 left end 1
Even when the left side of the rubber sheet 10 is hooked by the side 1a, the protrusion 35 can be kept away from the hooked portion.
6 can be prevented from coming off easily. For this reason, the position of the rubber sheet 10 can be reliably restricted to a predetermined position on the keyboard chassis 1, and the rubber sheet 10 can be accurately attached to the keyboard chassis 1 in a stable state.

Further, even if the left end 11a of the switch board 11 is hooked on the left end of the rubber sheet 10 and the rubber sheet 10 is elastically displaced, the switch board 11 is centered on the left end 11a of the switch board 11. When the rubber sheet 10 is not caught by the left end 11a of the switch board 11 when the switch 11 is turned on the lower side of the keyboard chassis 1 when it is disposed on the lower surface of the keyboard chassis 1, the protrusion 35 of the rubber sheet 10 is removed.
Is fitted to the regulating portion 36 of the keyboard chassis 1 and the rubber sheet 1
Since the position of 0 is regulated, the rubber sheet 10 returns to a predetermined position by its own elastic return force.
This also allows the rubber sheet 10 to be accurately attached to the keyboard chassis 1 in a stable state.

In the first to third embodiments, the case where the dome-shaped bulging portion 12 is provided in one row in the rubber sheet 10 corresponding to the pressing portion 8 of the key 2 has been described. Instead, for example, as shown in FIG. 16B, a structure in which two rows of dome-shaped bulging portions 12 are provided on one rubber sheet 40 may be used. In this case, as shown in FIGS. 15 and 16A, the keyboard chassis 1 may be provided with two rows of through holes 13 into which the bulging portions 12 are inserted, and the key 2 may be provided with two pressing portions 8. And a pair of fixed contacts 17 are formed on the switch substrate 11.
May be provided in two rows corresponding to each bulging portion 12. Also,
As shown in FIG. 16B, the rubber sheet 10 has a left bulging portion 12 located on the locking portion 14 side of the keyboard chassis 1.
On the right side of the rubber sheet 10, that is, in the middle of the rubber sheet 10.
16 is provided on the keyboard chassis 1 as shown in FIG.
As shown in (a), the restricting portion 36 into which the protrusion 35 is fitted.
Should be provided. With such a structure, in addition to the same operational effects as the first to third embodiments, in particular, when the key 2 is depressed, the pair of bulging portions 12 are sequentially elastically deformed, and each movable contact 16 is moved. Since each fixed contact 17 is contacted with a time difference, a switch signal can be output as a strength signal of a touch response for controlling generation of a musical tone at the time difference.

[0032]

As described above, according to the present invention, the rubber sheet is disposed on the lower surface of the keyboard chassis by inserting the dome-shaped bulging portion of the rubber sheet into the through hole of the keyboard chassis from below, When the switch board is assembled to the keyboard chassis in this state, the guide protrusions provided on the keyboard chassis guide the switch board so as not to contact the rubber sheet, so that the rubber sheet is displaced by being hooked on the switch board as in the related art. The switch member can be accurately assembled in a stable state. In this case, the switch member can be attached to the keyboard chassis without using a screw or the like by the guide projection having an elastic hook portion for locking the switch board disposed on the lower surface of the keyboard chassis. Can be easily done.

According to the third aspect of the present invention, the protruding portion whose position is regulated by the regulating portion provided on the keyboard chassis slides when the switch substrate is slid and assembled to the keyboard chassis. Is provided at a position distant from the end of the rubber sheet located on the side, even when the switch board is hooked on the end side of the rubber sheet located on the slide direction side when the switch board is assembled, the hook is caught. The protrusion can be kept away from the end side of the rubber sheet, and thus the protrusion can be made hard to come off from the restricting portion. As a result, the position of the rubber sheet can be reliably restricted to a predetermined position. Can be mounted accurately in a stable state.

[Brief description of the drawings]

FIG. 1 is an essential part cross-sectional view of a keyboard chassis in a first embodiment of a keyboard device of the present invention.

FIG. 2 is a bottom view of the keyboard chassis of FIG. 1;

FIG. 3 is a bottom view of a rubber sheet attached to the keyboard chassis of FIG. 1;

FIG. 4 is a bottom view of the switch board assembled to the keyboard chassis of FIG. 1;

5 is a cross-sectional view of a main part showing a state in which a rubber sheet is arranged on the keyboard chassis of FIG. 1 and before a left end of the switch board is inserted into a locking portion of the keyboard chassis.

FIG. 6 is a bottom view of FIG. 5;

FIG. 7 is a sectional view of a main part showing a state where the left end of the switch board is inserted into a locking portion of the keyboard chassis in the state of FIG. 5;

FIG. 8 is a bottom view of FIG. 7;

FIG. 9 is a cross-sectional view of a main part of a keyboard device according to a second embodiment of the present invention, showing a state in which a rubber sheet is disposed on a keyboard chassis and before a left end of a switch board is inserted into a locking portion of the keyboard chassis; FIG.

FIG. 10 is a bottom view of FIG. 9;

FIG. 11 is a cross-sectional view of a main part showing a state where the left end of the switch board is inserted into a locking portion of the keyboard chassis in the state of FIG. 9;

FIG. 12 is a bottom view of FIG. 11;

FIG. 13 is a bottom view of a keyboard chassis in a keyboard device according to a third embodiment of the present invention.

FIG. 14 is a bottom view of the rubber sheet attached to the keyboard chassis of FIG. 13;

FIG. 15 is a sectional view of a main portion of a keyboard chassis showing another embodiment of the keyboard device of the present invention.

16 (a) is a bottom view of the keyboard chassis of FIG. 15,
(B) is a bottom view of the rubber sheet.

FIG. 17 is a sectional view showing a conventional keyboard device.

FIG. 18 is a bottom view of FIG. 17;

19 is a cross-sectional view showing a state where the switch board is attached to the keyboard chassis in a state where the rubber sheet is arranged on the keyboard chassis of FIG. 17;

FIG. 20 is a bottom view of FIG. 19;

[Explanation of symbols]

 Reference Signs List 1 keyboard chassis 2 key 3 switch member 10, 40 rubber sheet 11 switch board 12 bulging portion 13 through hole 25 first guide protrusion 26 second guide protrusion 31 elastic hook portion 35 protrusion 36 regulating portion

Claims (3)

[Claims] 1. A keyboard chassis, a key provided on the keyboard chassis so as to be rotatable in a vertical direction, and a switch member provided on the keyboard chassis and operated by a key press operation of the key. In the keyboard device provided, the switch member includes a rubber sheet having a dome-shaped bulge inserted from below into a through hole provided in the keyboard chassis corresponding to the key, and a rubber sheet having A switch board disposed on the lower surface of the keyboard chassis, and the keyboard chassis is provided with a guide protrusion for preventing the switch board from contacting the rubber sheet when the switch board is assembled. A keyboard device characterized in that: 2. The device according to claim 1, wherein said guide projection has an elastic hook portion for locking said switch board when said switch board is disposed on a lower surface of said keyboard chassis via said rubber sheet. Item 2. The keyboard device according to Item 1. 3. A keyboard chassis, a key provided on the keyboard chassis so as to be rotatable in a vertical direction, and a switch member provided on the keyboard chassis and operated by a key press operation of the key. In the keyboard device provided, the switch member includes a rubber sheet having a dome-shaped bulge inserted from below into a through hole provided in the keyboard chassis corresponding to the key, and a rubber sheet having A switch board arranged on the lower surface of the keyboard chassis, and the rubber sheet is located on the sliding direction side of the switch board when the switch board slides and is assembled to the keyboard chassis. A keyboard device provided with a projection which is located at a position away from an end of the keyboard chassis and whose position is regulated by a regulating portion provided on the keyboard chassis.