JPH10106383A - Keyboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin keyboard with good feeling of touch on a key and high productivity. SOLUTION: In a keyboard 200,a switch part 260 which is operated by being pressed with an operation rubber 240 is arranged between a packing board 201 and a key frame 210, and a linking plate 220 formed by integrally linking a first linking part 221 and a second linking part 222 to a thin elastic linking plate 230 is arranged between the key frame 210 and a key top 250. The linking plate 220 guides and supports the key top 250 so that the key top 250 is capable of vertically moving.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key switch of a keyboard usable for an input device such as a personal computer (PC) or a word processor, and more particularly to a keyboard effective for a thin keyboard used in a notebook computer. About.

[0002]

2. Description of the Related Art In a generally known keyboard of a computer input device, another guide member is provided below a key top so that the key top can be repeatedly moved up and down smoothly. I have. The housing or holder provided below the guide member is connected when the keytop is pressed, and a switching element for generating an electrical operation is installed. An operating rubber made of an elastic material is installed so as to be possible.

However, the keyboard provided with the guide member as described above is limited to the stroke of the vertical movement of the key top and the height of the entire keyboard (minimum height of 8 mm).
As described above, since the stroke is 3 mm or more), it cannot be used for a thin keyboard used in a notebook computer or the like which is currently increasing in use.

In order to solve the above problem and to make the keyboard thinner, a thin keyboard in which a key top is vertically moved using a link member or a hinge member is disclosed in US Pat. Nos. 5,488,210 and 5,512,719. It is proposed in the specification.

FIG. 6A is a plan view showing a keyboard disclosed in US Pat. No. 5,488,210, and FIG.
FIG. 7B is a cross-sectional view of the keyboard shown in FIG.

As shown in FIG. 6, in the keyboard 1, the key top 50 is located between the housing 10 and the key top 50.
The link member 20 which enables the smooth upward and downward operation is connected. Between the link member 20 and the housing 10, the switch section 40 and the contact rubber 60 are sequentially installed. The switch section 40 includes a movable contact 41 and a fixed contact 4.
2 are electrically operated when they come into contact with each other. The contact rubber 60 is an elastic material having a protrusion 61 formed inside the upper part of the switch.

FIG. 7 is a perspective view (A) and an exploded perspective view (B) showing a link member of the keyboard shown in FIG.
As shown in FIG. 7, the link member 20 includes first link portions 2 that are connected to each other so as to be able to move up and down.
1 and a second link portion 25. First link 21
Includes a first support portion 22 and two support members 23.
The first support portion 22 has an operation piece 24 and has two support members 2.
3 are connected. The second link 25 has two support members 27 and a second support 26 coupled between the support members 27.

Each support member 23 of the first link portion 21 has
The first support piece 28 is integrally formed outside the distal end portion, and the hinge piece 30 is integrally formed inside the central portion. Each support member 27 of the second link portion 25 has a second support piece 29 integrally formed inside the distal end thereof, and a curved slot 31 formed in the center.

On the other hand, as shown in FIG. 6, the first support portion 22 of the first link portion 21 and the second support piece of the second link portion 25 are provided on the bottom portion of the key top 50 and one side of the housing 10. First guide pieces 51 and 11 into which the respective 29 are rotatably and slidably inserted are provided. Further, the second support portion 26 of the second link portion 25 is provided on the bottom portion of the key top 50 and on the side of the housing 10 which is different from the above.
And second guide pieces 52 and 1 into which first support pieces 28 of first link portion 21 are rotatably and slidably inserted, respectively.
2 are provided.

[0010] As shown in FIG. 7, the hinge piece 30 of the first link part 21 is slidably inserted into the curved slot 31 of the second link part 25.

In the keyboard 1 having the above structure, when the user presses the key top 50, the key top 50 descends in parallel from the link member 20 connected thereto,
The contact rubber 60 of the operation piece 24 provided on the first support portion 22 of the first link portion 21 is pressed. Thereby, the protrusion 61 of the contact rubber 60 is connected to the movable contact 4 of the switch 40.
Press 1 to make it contact the fixed contact 42. As a result, the keyboard 1 operates electrically. When the hand is released from the key top 50, the key top 50 rises while being smoothly guided by the link member 20, and a series of vertical operations of the key top 50 is completed.

When the key top moves up and down as described above, the first support portion 22 and the first support portion 22 of the first link portion 21 fitted to the first guide piece 51 and the second guide piece 52 of the key top 50, respectively. The second support part 26 of the two link part 25 performs a rotation operation. At the same time, the first guide piece 11 of the housing 10
The first support piece 28 of the first link portion 21 and the second support piece 29 of the second link portion 25 fitted respectively to the second guide piece 12 slide when the key top 50 is moved up and down. . Further, the hinge piece 30 of the first link portion 21 inserted into the curved slot 31 of the second link portion 25
Also, the key top 50 slides when the key top 50 is moved up and down.

FIG. 8A is a plan view showing a keyboard disclosed in US Pat. No. 5,512,719.
FIG. 8B is a diagram illustrating the B-B of the keyboard shown in FIG.
It is B sectional drawing.

As shown in FIG. 8, in the keyboard 100, the key top 120 of the keyboard 100 and the holder 1
Between the key top 12 and the key top 12
The hinge member 130 for guiding the zero is connected.

FIG. 9A is a front view showing the link member of the keyboard shown in FIG. 8, and FIG. 9B.
FIG. 4 is a view showing a state where the link member is separated.
As shown in FIG. 9, a switch member 140 including a movable contact 141 and a fixed contact 142 is provided on the holder 110.
And a guide support 150 made of an elastic member. The guide support part 150 is for operating the switch member 140 and is installed so as to be located above the switch member 140.

The hinge member 130 includes a set of support portions 132.
Are integrally connected via a first support portion 131, and a pair of support portions 135 is a second support portion 13
And a second hinge portion 136 integrally connected via the first hinge portion 4 and the first hinge portion 133 and the second hinge portion 136.
They are connected to each other in a crossed state.

Each of the support members 132 of the first hinge portion 133 has a first support piece 137 on the outer side of the distal end portion.
A guide groove 138 is formed inside the central portion. The support portion 135 of the second hinge portion 136 is integrally formed with second support pieces 139 and 143 at both end portions, and a projection 144 at a central portion.

Further, as shown in FIG. 8, first guide pieces 121 and 111 are provided on the bottom of the key top 120 and one side of the holder 110, and the first guide pieces 121 and 111 are provided on the first guide pieces 121 and 111. The first support part 131 of the first hinge part 133 and the second support piece 143 of the second hinge part 136 are rotatably fitted to the first hinge part 133, respectively. Second guide pieces 122 and 112 are provided on the bottom of the keytop 120 and on the side different from the above-described side of the holder 110, respectively. The second guide pieces 122 and 112 are provided with the second hinge portions 136, respectively. The first support piece 139 and the first support piece 137 of the first hinge portion 133 are slidably fitted.

On the other hand, the projection 144 of the second hinge 136
Is rotatably inserted into the guide groove 138 of the first hinge portion 131.

In the above keyboard 100, when the user presses the key top 120, the key top 120 descends in parallel by the hinge member 130, and the guide support 150
push. At the same time, the protrusion 151 at the bottom of the guide support 150 causes the movable contact 141 of the switch member 140 to contact the fixed contact 142, and as a result, the keyboard 100 is electrically operated.

When the key top 120 moves up and down,
The first support portion 131 of the first hinge portion 133 and the second support portion 139 of the second hinge portion 136 fitted to the first guide piece 121 or the second guide piece 122 installed on both sides of the bottom of the key top 120 are provided. Perform rotation and sliding, respectively. At the same time, the second support piece 143 and the first hinge part 133 of the second hinge part 136 fitted on the first guide piece 111 or the second guide piece 112 installed on both upper sides of the holder 110.
The first support piece 137 rotates and slides.
On the other hand, the protrusion 144 of the second hinge 136 inserted into the guide groove 138 of the first hinge 131 rotates.

[0022]

However, in the keyboard 1 disclosed in the above-mentioned US Pat. No. 5,488,210, the link member 20 is different from the first link portion 21 which is a separate member.
And the second link portion 25 are assembled so as to cross each other. In addition, a contact rubber 60 that enables the key top 50 to move up and down is separately provided on the keyboard 1. Therefore, in the keyboard 1, the first link portion 21 and the second link portion 25) must be separately assembled, and there is a disadvantage that the number of assembling steps of the entire keyboard increases. In addition, the structure of the keyboard becomes complicated,
Workability and productivity are significantly reduced, and the overall height of the keyboard is increased, so that the touch feeling of the keyboard itself (feeling to press the key top) is disadvantageously deteriorated.

On the other hand, the keyboard 100 disclosed in US Pat. No. 5,512,719 is also disclosed in US Pat. No. 5,488,210.
Similarly to the keyboard 1 disclosed in the specification, the hinge portion 130 has a configuration in which a first hinge portion 133 and a second hinge portion 136 which are separate members are connected. In addition, the guide support unit 150 that enables the key top 120 to move up and down,
It is separately installed on the keyboard 100. Therefore, there is a problem that the number of steps for assembling the keyboard 100 increases because the first hinge 133 and the second hinge 136 are separately assembled. In addition, there is a problem that the structure of the keyboard 100 is complicated, and workability and productivity are significantly reduced. Further, there is a problem that the height of the keyboard 100 is increased and the touch feeling of the keyboard itself is reduced.

The present invention has been devised to solve the above-mentioned conventional problems, and a first object of the present invention is to provide a link provided between a key top and a key frame of a keyboard. By configuring the plate integrally,
When the key top is moved up and down, even if the user presses only a part of the key top, the link plate is smoothly moved up and down in a parallel state, thereby providing a keyboard with further improved key top up and down function. is there.

It is a second object of the present invention to provide a keyboard which can maintain a constant stroke of up and down operation of the key top by using an integrated link plate.

A third object of the present invention is to provide a thinner keyboard by integrally forming a plurality of operation rubbers in a sheet shape.

Further, a fourth object of the present invention is to simplify the structure of the keyboard itself by using an integrated link plate, to reduce the number of assembling steps, to simplify manufacture, and to improve workability and productivity during assembly. It is another object of the present invention to provide an improved keyboard.

[0028]

To achieve the above object, according to the present invention, a key frame (210) is provided.
A key top (250) arranged to face the key frame; and an operating member sheet (242) for elastically supporting the operating member (240) up and down at a position corresponding to the key top. A switch unit (260) provided at a position corresponding to the key top, wherein the movable contact (261) and the fixed contact (264) come into contact with each other by up and down operation of the operating member in conjunction with operation of the key top.
And a first link portion (2) having one end connected to the key frame and the other end connected to the key top.
21) and a second link portion (222), and a connecting plate (230) for integrally connecting the first link portion and the second link portion in a state of intersecting each other. A keyboard is characterized in that the keyboard is provided with a link plate (220) that supports the key top so as to be able to move up and down.

According to a second aspect of the present invention, the first link portion of the ring plate has a first support portion (223) connected to the key top at one end and a second support portion connected to the key frame. A support portion (224) is formed to project from the other end, and a protrusion (23) connected to one end of the connection plate between the first support portion and the second support portion.
1), the second link portion is formed by projecting one end of a first support piece (225) coupled to the key frame, and a second support piece (226) coupled to the key top. And a projection (232) connected to one end of the connection plate between the first support piece and the second support piece. The gist is the keyboard described in 1.

According to a third aspect of the present invention, the first support portion of the first link portion is slidable with a first guide piece (251) provided below the key top. Is
The second guide piece (2) provided on the upper part of the key frame
14), and the first support piece of the second link portion is slidably connected to a first guide piece (213) provided on an upper portion of the key frame. 3. The keyboard according to claim 2, wherein the keyboard is rotatably connected to a second guide piece (252) provided below the key top.

According to a fourth aspect of the present invention, the connecting plate is
Formed thinner than the first link portion and the second link portion,
The keyboard according to any one of claims 1 to 3, wherein the keyboard has elasticity that allows the first link portion and the second link portion to move up and down. .

According to a fifth aspect of the present invention, the connecting plate has a thickness of 0.1 mm or more and 0.3 mm or less. It should be a keyboard.

According to a sixth aspect of the present invention, the vertical movement of the link plate is facilitated between the first link portion and the connecting plate and between the second link portion and the connecting plate. The keyboard according to any one of claims 1 to 5, wherein a gap (233) is provided.

According to a seventh aspect of the present invention, the switch section and the operating member sheet are provided with the key frame and a backing board (20) disposed below the key frame.
1) The keyboard according to any one of claims 1 to 6, wherein the keyboard is arranged between the keyboard and the keyboard.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.

FIG. 1 is an exploded perspective view showing a keyboard according to the present invention. FIG. 2A is a plan view illustrating a keyboard according to the present invention, and FIG. 2B is a plan view of FIG.
5 is a cross-sectional view of the keyboard shown in FIG.

The keyboard according to the present invention comprises a key frame 210 provided on the backing board 201,
A key top 250 provided with a guide piece, a link plate 220 disposed between the key frame 210 and the key top 250 for guiding and supporting the key top 250 so that the vertical movement is smooth; The movable contact 261 and the fixed contact 2 are actuated by the action of the operating rubber 240
And a switch section 260 for bringing the keyboard 200 into electrical contact with the switch section 260.

The key frame 210 has fastening holes 21 on both sides.
One. On the other hand, a through-hole 202 is formed in the backing board 201, and the key frame 210 is coupled to the backing board 201 by inserting a fixing bolt 203 into the through-hole 202 and fastening to the fastening hole 211.

The switch section 260 has the movable contact 26
An upper plate 262 on which a reference numeral 1 is printed, a guide plate 263 having an opening at a position corresponding to the movable contact 261, and a lower plate 265 on which a fixed contact 264 is printed are laminated in this order. When the inner protrusion 241 of the operation rubber 240 presses the movable contact 261, the switch 260 contacts the fixed contact 264 of the lower plate 265 through the opening provided in the guide plate 263. Backing board 201 and key frame 210
It is installed between.

Key frame 210 and backing board 2
01 on the upper side of the switch unit 260 provided between
An operation rubber sheet 242 in which a plurality of operation rubbers 240 are arranged in accordance with a circuit pattern of the keyboard is arranged. The operation rubber sheet 242 is attached to the key frame 210.
When the fastening is performed between the operating rubber sheet 242 and the backing board 201, the fixing bolt 203 passes through the through holes 243 formed on both sides of the operation rubber sheet 242, and integrally connects these members.

FIG. 3A is a plan view showing a key frame of the keyboard according to the present invention, and FIG. 3B is a front structural view of the key frame. Keyframe 210
A through hole 212 from which the operation rubber 240 can protrude is formed at the bottom center. Further, fastening holes 211 for fastening the fixing bolts 203 are formed at both ends of the key frame 210. Key frame 2
The first guide piece 213 is provided on one side of the upper part of the 10. The first guide piece 213 is for slidably fitting the first support piece 225 formed on the second link portion 222 of the link plate 220. On the upper side of the key frame 210, which is different from the above, a second
The guide piece 214 is formed integrally. The second guide piece 214 is connected to the first link 2 of the link plate 220.
This is for rotatably inserting the support portion 224 formed at 21.

FIG. 4A is a plan view of an integrated link plate for guiding and supporting the vertical movement of the key top in the keyboard according to the present invention, and FIG. 4B is a front view of the integrated link plate. It is. FIG. 4 (C)
FIG. 3 is a main part structural diagram showing a connecting plate of an integrated link plate.

The integrated link plate 220 which guides and supports the vertical movement of the key top 250 is a member integrally formed by injection molding. This integrated link plate 2
20 has a first link portion 221 and a second link portion 222. The first link part 221 is slidably fitted to the first guide piece 251 of the key top 250.
23 is formed at one end thereof, and a second support portion 224 is formed at the other end opposite thereto. In addition, the first link portion 221 has a protruding portion 231 formed integrally with one end of the connecting plate 230 on the outside of the rear of the body.

The second link part 222 is connected to the first link part 22.
The first support piece 225 is formed to protrude inward at the rear ends of both sides of the first support piece 221 and is slidably fitted to the first guide piece 213 of the key frame 210, and is opposite to the formation of the first support piece 225. The second guide piece 25 formed integrally with the end of the key top 250 and installed on the other side of the bottom of the key top 250
2 and a second support piece 226 rotatably fitted to the second support piece 226. In addition, the second link portion 222
A protruding portion 232 integrally formed with the other end of the connecting plate 230 is formed.

The first link part 221 and the second link part 222
Are integrally connected via a connecting plate 230. Further, gaps 233 are provided between the connection plate 230 and the first link portion 221 and the second link portion 222 to facilitate the elastic operation of the link plate 220.

FIG. 5A is a plan view showing a key top of a keyboard according to the present invention, and FIG. 5B is a front view of the key top. As shown in FIG. 5, a first guide piece 251 is formed on one side of the bottom of the key top 250. The first support portion 223 of the first link portion 221 is slidably fitted to the first guide piece 251. A second guide piece 252 is formed on the side opposite to the side where the first guide piece 251 is formed. A second support piece 226 of the second link portion 222 of the link plate 220 is rotatably fitted to the second guide piece 252.

Next, the operation and effect of the keyboard having the above-described structure according to the present invention will be described.

As shown in FIGS. 1 to 5, a plurality of through holes 202 are formed in the backing board 201 at positions corresponding to the fastening holes 211 formed on both sides of the bottom of the key frame 210 of the keyboard 200. And are sequentially arranged. On the upper side of the backing board 201, at a position corresponding to each key of the keyboard 200,
A switch section 260 is provided. Switch section 260
An operation rubber sheet 242 formed by arranging a plurality of operation rubbers 240 protruding upward through the central through hole 212 of the key frame 210 is located on the upper side.

The fixing bolt 203 is attached to the backing board 2
01, penetrates the backing board 201 and the working rubber sheet 242, and is integrally connected to the fastening hole 211 of the key frame 210. Thus, the switch 260 and the operation rubber 240 are fixed between the backing board 201 and the key frame 210.

As described above, the use of the operating rubber sheet 242 significantly reduces the number of assembling steps when assembling a keyboard having a plurality of switches on the backing board 201. At the same time, even if the installation position of the key is changed due to the external shape of the keyboard, it becomes easy to carry out an assembling work corresponding to the change.

The switch section 260 and the operating rubber 2
40 is disposed on the backing board 201 because the integrated link plate 22 is provided between the key frame 210 and the key top 250 which are connected and fixed to each other.
0 is connected so that the vertical movement of the key top 250 is performed in parallel and smoothly.

On both sides of the upper part of the key frame 210, a first guide piece 213 and a second guide piece 214 are respectively installed. Second link part 2 of link plate 220
The first support piece 225 formed on one end of the
It is fitted on the guide piece 213 and slides when the key top 250 is moved up and down. The second support portion 224 of the first link portion 221 of the link plate 220 is
And rotates when the key top 250 is moved up and down.

The first link portion 22 of the link plate 220
Connecting plate 23 for integrally connecting the first and second link portions 222
0 means that the thickness is 0.1 mm or more and 0.3 mm or less, preferably about
It is a thin plate formed to 0.2 mm. This is the connection plate 23
When the thickness of 0 is larger than 0.3 mm, the user's touch feeling of the key top 250 (feeling to press the key top) is reduced. On the other hand, when the thickness is smaller than 0.1 mm,
This is because its production becomes impossible. In the present embodiment, the thickness of the connecting plate 230 is thinner than the first link portion 221 and the second link portion 222.

Since the link plate 220 has a structure in which the first link portion 221 and the second link portion 222 are integrally connected via the connecting plate 230, the members in the crossed state are vertically moved by the elastic force of the connecting plate 230. , And the assembling work of the keyboard 200 is facilitated.

First link portion 22 of link plate 220
The first support portion 223 formed at one end of the key top 250 is inserted into a first guide piece 251 formed on one side of the bottom of the key top 250, and slides when the key top 250 is vertically moved. . On the other hand, the second support piece 226 formed at one end of the second link portion 222 of the ring plate 220
The key top 250 is inserted into a second guide piece 252 formed at the bottom of the key top, and rotates when the key top 250 moves up and down.

The second link portion 22 of the link plate 220
The first support piece 225 formed on the other end of the first guide piece 2 is formed on one side of the bottom of the key frame 210.
13 and when the key top 250 is moved up and down,
Perform sliding. In addition, the second support portion 224 formed on the first link portion 221 of the link plate 220 is inserted into the second guide piece 252 of the key frame 210, and rotates when the key top 250 is vertically moved.

That is, the support portions 223 and 224 and the support pieces 225 and 226 of the link plate 220 are connected to the guide pieces 213 and 2 of the key frame 210 and the key top 250.
14, 251, and 252, some of which perform sliding, and some of which perform rotational operation. Accordingly, even if the user presses only a part of the key top 250, the pressing force is transmitted uniformly to the entire link plate 220, and the key top 250 always smoothly moves up and down. .

As described above, according to the present invention, the use of the integrated operating rubber sheet 242 and the ring plate 220 simplifies the structure of the keyboard 200, thereby improving workability and productivity during assembly. Further, since the stroke of the link plate 220 is short, the height of the keyboard is suppressed to a minimum, the keyboard 200 can be made thinner, and when the user presses the key top 250, the touch (pressing feeling) is given. Can be kept good.

[0059]

As described above, according to the present invention,
Since the link plate to be arranged between the key top and the key frame of the keyboard was configured as an integral type,
Even if the user presses only a part of the keytop, when the keytop is moved up and down, the link plate moves smoothly up and down with the link plate in parallel, and the performance of the keytop up and down operation is further improved. . In addition, since the integrated link plate is used, the stroke of key top up / down operation is
The keyboard is always kept in a constant state, and a plurality of operating rubbers are integrally formed in a sheet shape, so that the keyboard can be made thinner. Furthermore, the use of the integrated link plate simplifies the structure of the keyboard itself, thereby facilitating the manufacture of the keyboard, reducing the number of assembly steps, and improving workability and productivity during assembly. An excellent effect of further improvement is obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a keyboard according to the present invention.

FIG. 2 is a plan view (A) showing a keyboard according to the present invention;
And a CC sectional view (B) of the keyboard.

3A is a plan view showing a key frame of a keyboard according to the present invention, and FIG. 3B is a front structural view of the key frame.

FIG. 4 is a plan view (A) of an integrated link plate that guides and supports the vertical movement of a key top in the keyboard according to the present invention, and a front view (B) of the integrated link plate;
FIG. 7C is a main part structural diagram (C) showing a connecting plate of the integrated link plate.

5A is a plan view showing a key top of a keyboard according to the present invention, and FIG. 5B is a front view of the key top.

FIG. 6A is a plan view showing a conventional keyboard disclosed in US Pat. No. 5,488,210, and FIG. 6B is a sectional view taken along line AA of the keyboard.

FIG. 7 is a perspective view (A) and an exploded perspective view (B) showing a link member of the keyboard disclosed in US Pat. No. 5,488,210.

FIG. 8 is a plan view showing a keyboard disclosed in US Pat. No. 5,512,719, and B of the keyboard;
It is a B sectional view (B).

FIG. 9 is a front structural view (A) showing a link member of the keyboard disclosed in US Pat. No. 5,512,719, and
FIG. 5B is a view showing a state where the link member is separated.

[Explanation of symbols]

 200 Keyboard 201 Backing board 202, 212 Through hole 203 Fixing bolt 210 Frame 211 Fastening hole 213 First guide piece 214 Second guide piece 220 Link plate 221 First link part 222 Second link part 223 First support part 224 Second support Part 225 First support piece 226 Second support piece 230 Connecting plate 231, 232 Projection part 240 Operation rubber 241 Operation rubber protrusion 242 Operation rubber sheet 250 Key top 251 First guide piece 252 Second guide piece 260 Switch part 261 Movable contact 264 fixed contact

Claims (7)

[Claims] A key frame; a key top arranged to face the key frame; an operating member sheet for elastically supporting an operating member at a position corresponding to the key top so as to be vertically movable; A switch unit provided at a position corresponding to the key top, wherein the movable contact and the fixed contact come into contact with each other by the up and down operation of the operating member in conjunction with the operation of the key top; and one end of each of the switch units is coupled to the key frame. A first link portion having an end coupled to the keytop and a second link portion;
A link for connecting the first link portion and the second link portion integrally in a state of intersecting with each other, and a link for supporting the key top vertically with respect to the key frame; A keyboard comprising a plate. 2. The first link portion of the ring plate has a first support portion coupled to the keytop at one end,
A second support portion coupled to the key frame is formed to project from the other end, and further, a protrusion connected to one end of the connection plate is formed between the first support portion and the second support portion. The second link portion is formed by projecting a first support piece coupled to the key frame at one end and a second support piece coupled to the key top at the other end, respectively.
2. The keyboard according to claim 1, wherein a protrusion connected to one end of the connection plate is formed between the support piece and the second support piece. 3. 3. The first support portion of the first link portion is slidable with a first guide piece provided below the key top, and the second support portion is provided on an upper portion of the key frame. The first support piece of the second link portion is slidably connected to the first guide piece provided on the upper part of the key frame. 3. The keyboard according to claim 2, wherein the keyboard is rotatably connected to a second guide piece provided below the key top. 4. 4. The connecting plate is formed to be thinner than the first link portion and the second link portion, and has an elasticity that allows the first link portion and the second link portion to move up and down. Any one of claims 1 to 3
Keyboard described in section. 5. The keyboard according to claim 1, wherein the connecting plate has a thickness of 0.1 mm or more and 0.3 mm or less. 6. between the first link portion and the connecting plate;
A gap is provided between the second link portion and the connecting plate to facilitate the up and down operation of the link plate. Keyboard described in section. 7. The switch unit and the operation member sheet are disposed between the key frame and a backing board disposed below the key frame, and are integrally fixed. The keyboard according to any one of claims 1 to 6.