JP2002324450A - Key switch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a key switch device that can assemble a link member and a holder member easily and can realize good key operation while maintaining a large key stroke without obstructing a descent motion of a key top halfway. SOLUTION: A thick will part 21a is formed integrally on the inside of a linking portion of a pair of plate-like body 17 and a lock bar 21 in a second link member 8 so as to project both end parts of the lock bar in pin form. On the inside part of a lock bar 13 formed between ends of a pair of plate-like body 9 in a first link member 7, a thick part 13a in plan view is formed integrally. Furthermore, both ends of the first link member 7 and the second link member 8 are formed thin as compared with the center in side view.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key switch device, and more particularly to a key switch device used for a thin keyboard attached to a notebook personal computer or the like.

[0002]

2. Description of the Related Art A conventional key switch device employs a configuration in which a key stem vertically provided from the back surface of a key top is inserted into a key holder portion formed on a holder member and guided vertically. In the key switch device having such a configuration, if the portion slidably guided by the key holder portion of the key stem is enlarged, the key operability is improved, but the keyboard cannot be made thinner. On the other hand, if the portion where the key stem is slid and guided by the key holder portion is reduced in order to cope with the thinning of the keyboard, there is a disadvantage that the operability of the key is reduced due to the torsion occurring between the two.

In order to solve the above-mentioned drawbacks of the conventional key switch device, the present applicant has shown in FIGS. 11 to 13 in which the key stem and the key holder are eliminated, the keyboard can be made thinner, and the key operability is improved. A key switch device was proposed in the specification and drawings attached to the application of Japanese Patent Application No. 3-330160 (Japanese Patent Application No. 3-33016).
No. 0 has not been published at the time of the original filing of the present application).

An outline of such a key switch device will be described. As shown in FIG. 11 to FIG.
In the key switch device described in the specification of No. 30160, a resin key top 101 is provided with two locking portions 102 and 103 (each locking portion 102, 103) provided on the back surface thereof.
A pair of locking holes 104 and locking grooves 105 and two locking portions 126 and 127 of the resin holder member 125 (each of which has a pair of locking portions 126). The guide support member 106 (consisting of two resin link members 107 and 108 provided between the stop groove 128 and the lock hole 129, and locking pins 113 and 114 provided at one end of the link member 107, respectively). In the locking hole 104,
The locking pins 115 and 116 provided at the other end are used to lock the locking groove 12.
8, locking pins 123 and 124 provided at one end of the link member 108 are locked in the locking groove 105, and locking pins 121 and 122 provided at the other end are locked in the locking holes 129. Up and down).

[0005] Axial support portions A of both link members 107 and 108 are disposed on the top of a rubber spring 131 mounted on a flexible circuit board 130 supported on a support plate 132, and press the key top 101. Thus, the rubber spring 131 is buckled via the shaft support A to perform the switching operation.

As shown in FIG. 12, the link member 107 has two base ends 110, 1 at both ends of the base 109.
11 are integrally formed. A shaft 112 extends from one side surface of the central portion of the base 109, and the shaft 112 is supported by a shaft hole 120 formed in the other link member 108 described later.

Further, locking pins 113 and 114 extend from the side surfaces of both end extending portions 110A of the base end portion 110. The locking pins 113 and 114 are connected to the locking portions 102 of the key top 101 described above. Is locked by a locking hole 104 formed in the hole. Further, the base end portion 111 is formed in a U-shape in plan view, and the same locking pins 115 and 116 as those described above extend from the side surfaces of the U-shaped both-end extending portion 111A. The locking pins 115 and 116 are used for the holder member 1.
25 is locked by the locking portion 126 formed.

As shown in FIG. 13, the link member 108 has two base ends 118, 11 at both ends of the base 117.
9 are integrally formed. A shaft hole 120 is formed in the center of the base 117, and the shaft 112 provided on the base 109 of the link member 107 is inserted into the shaft hole 120 as described above. Further, the base end portion 118 is formed in a U-shape in a plan view, and locking pins 121 and 122 extend from the U-shaped both end extending portions 118A. The locking pins 121 and 122 are locked by locking portions 127 formed on the holder member 125.

Further, the same locking pins 123, 124 as described above are extended from both end extending portions 119A of the base end portion 119. The locking pins 123, 124 are connected to the locking portions 103 of the key top 101 described above. Is slidably locked in the locking groove 105 formed in the groove.

As described above, the guide support member 106 is formed by the shaft 11 formed on the base 109 of one of the link members 107.
2 is inserted through a shaft hole 120 formed in the base 117 of the other link member 108, and both link members 107 and 108 are connected via a shaft support A formed of a shaft 112 and a shaft hole 117. It is possible to rotate relative to each other.

According to such a key switch device, a key switch device having good key operability while realizing a thin keyboard can be realized.

[0012]

However, in the key switch device described in the specification and drawings of Japanese Patent Application No. 3-330160, the guide support member 106 including the holder member 125 and the two link members 107 and 108 is used. And the assembling of the guide support member 106 and the key top 101 cannot be performed simply and easily.

That is, in order to assemble the key switch device, first, the link member 107 and the link member 108 are assembled in a cross shape to form the guide support member 106, and then both the locking at the base end 118 of the link member 108 are performed. Pin 12
1 and 122 are press-fitted into locking holes 129 of locking portions 127 of holder member 125. At this time, the locking pin 121,
The press-fit of the 122 into the locking hole 129 is performed by the end extension 118.
A, the locking pins 121 and 122 are made using the mutual resin elasticity.
9 is difficult to position, and therefore, the press-fitting operation tends to be unstable. Therefore, this press-fitting operation was considerably complicated.

The locking pins 115 and 116 at the base end 111 of the link member 107 are pressed into the locking grooves 128 of the locking portion 126. Even in such a case, since the press-fitting work is performed by using the resin elasticity of the end extension 111A and the locking pins 115 and 116, it is undeniable that the work is complicated as described above.

After the linking work between the link members 107 and 108 and the locking portions 127 and 126 of the holder member 125 is completed, the locking pins 113 and 114 of the link member 107 are locked. The operation of press-fitting into the locking hole 104 of the portion 102 and the operation of pressing the locking pins 123 and 124 of the link member 108 into the locking groove 105 of the locking portion 103 are performed. The two press-fitting operations also include the locking pins 113, 114, 123, 124 and the locking portions 102, 1
Since the process is performed by utilizing the resin elasticity between the process and the process No. 03, the complicated process is the same as the above-mentioned process.

As described above, in the key switch device described in the specification and drawings of Japanese Patent Application No. 3-330160, the link members 107 and 108 of the guide support member 106, the holder member 125, and the key top 101 are connected to each other. Each connection work is all performed using the resin elasticity of each member,
Further, since it is necessary to lock the locking pins 115 and the like while positioning them in the locking grooves 128 and the like, it is necessary to repeatedly perform a complicated press-fitting work throughout the assembly work of the key switch device. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and can assemble a link member and a holder member very easily.
It is an object of the present invention to provide a key switch device capable of realizing good key operability while maintaining a large key stroke without hindering a lowering operation of a key top.

[0018]

In order to achieve the above object, a key switch device according to a first aspect of the present invention has a key top and a plurality of locking portions disposed below the key top. The holder member, a first link member and a second link member that are connected and locked to the lower surface of the keytop and the plurality of locking portions of the holder member, and guide the keytop up and down, and urge the keytop upward. A key switch device comprising a biasing means and performing a switching operation in accordance with a vertical movement of a key top, wherein one of the first link member and the second link member is rotatable to a locking portion of a holder member. A pair of rotating end portions are formed, and a thick portion is formed inside the rotating end portion. The first link member and the second link member have a thickness at a central portion in a side view. Each of the thinner ends For example, characterized in that is. The key switch device according to a second aspect is the key switch device according to the first aspect, wherein the first link member or the second
On the other of the link members, a pair of rotating end portions that are rotatably locked to the lower surface of the key top are formed,
A thick portion is formed inside the rotation end.

[0019]

In order to assemble the key switch device according to the present invention, the lower ends of the first link member and the second link member are locked by the respective locking portions of the holder member. At the time of such locking, one of the link members is formed with a pair of rotating ends that are rotatably locked to the locking portions of the holder member, and the inside of the rotating ends has a flesh. Since the thick portion is formed, the rigidity of each rotating end is improved by such a thick portion,
The rotation end can be easily rotated and locked to the locking portion of the holder member without deforming each rotation end. After the lower ends of the first link member and the second link member are locked to the locking portions of the holder member as described above, the upper ends of the link members are locked to the lower surface of the keytop. . At the time of such locking, a pair of rotating ends that are rotatably locked to the lower surface of the key top are formed on the other of the two link members, and a thick portion is formed inside the rotating end. Is formed, the rigidity of each rotating end portion is improved by the thick portion, and the rotating end portion can be easily rotatably locked to the lower surface of the keytop without deforming each rotating end portion.

When a switching operation is performed in the key switch device, a key top is pressed. Then
With the depression, the key top is guided downward by the first link member and the second link member against the urging member. The switching operation is performed based on the key top pressing operation. At this time, since the first link member and the second link member have the end portions formed to be thinner than the thickness of the central portion in a side view, the key top is pressed to switch as described above. When performing the operation, even if the respective ends of both link members approach each other with the descending operation of the key top, each end in the middle of the descending of the key top is based on the fact that each end is formed in a thin shape. The contact of the parts is prevented. Therefore, the lowering operation of the key top is not hindered halfway, and good key operability can be realized while maintaining a large key stroke.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 to 8 show a first embodiment. FIG. 1 is a sectional view of a key switch according to a first embodiment. A key top 1 is molded from a synthetic resin such as an ABS resin, and letters such as alphabets are formed on the upper surface thereof by printing or the like. . In addition, key top 1
2, two locking portions 2 and 3 are provided integrally with the key top 1 body downward. In addition, the locking part 2,
3 has a pair in the direction perpendicular to the paper surface, and FIG. 1 shows only one of each pair.

The locking portion 2 rotatably locks a locking bar 13 formed at one end of the first link member 7 among two resin-made link members 7 and 8 described later. A groove 4 is formed. The locking portion 3 has a locking groove 5 for locking the locking pins 23 and 24 formed at one end of the second link member 8 so as to be slidable in the horizontal direction.

The locking groove 4 is formed by a pair of sandwiching walls 4b and 4c arranged side by side on the back surface of the key top 1. The locking groove 4 is continuous with the locking groove 4 and goes downward. A locking guide portion 4a that is opened so as to gradually expand is formed. The locking guide portion 4a guides the locking rod 13 of the first link member 7 toward the locking groove 4 when snapping into the locking groove 4.

Further, a locking guide portion 5 having a slope extending downward is formed at a position below the locking groove 5 of the locking portion 3.
a of the locking pin 2 of the second link member 8.
The guides 3 and 24 are guided toward the locking groove 5 when snapping into the locking groove 5.

A guide support member 6 for guiding and supporting the vertical movement of the key top 1 is provided below the key top 1, and the guide support member 6 is composed of two link members 7, 8. .

As shown in FIG. 2, the first link member 7 is
It is formed in a U-shape in plan view. This first link member 7
Has a pair of plate-like bodies 9, a locking rod 13 is integrally formed between one ends of the respective plate-like bodies 9, and the locking rods 13
A thick portion 1 formed in a thick shape in plan view
3a is formed integrally. The thick portion 13a on the opposite side of the locking bar 13 extends in parallel with the locking bar 13 and is formed in an H-shape (together) with the locking bar 13.

Both ends of the H-shaped locking bar 13 and the thick portion 13a are connected to a pair of plate members 9, respectively. Therefore, the locking rod 13 and the thick portion 13a are H
The two openings that are formed due to the character shape are closed by the pair of plate-like bodies 9 respectively, and the rigidity of the locking rod 13 is improved. As described above, since the rigidity of the locking rod 13 is improved by the thick portion 13a, the locking rod 1
3 through the locking guide portion 4a, the locking groove 4 of the key top 1
Can be snap-in (press-fit) inside.

Lock pins 15 and 16 are formed at the other end of each plate-like body 9, respectively.
Reference numerals 5 and 16 denote locking portions 2 formed on the holder plate 25.
6 locked. Further, a pair of shaft bodies 12 are provided at positions facing each other from the central position on the side of each plate body 9 facing each other. Each of these shafts 12
Are supported by a shaft hole 20 formed in the second link member 8.

Further, both ends of each plate member 9 are shown in FIGS.
As shown in FIG. 2 and the like, it is formed to be thinner than the thickness of the central part in side view. The locking bar 13 of the first link member 7
The locking pins 15 and 16 are configured so that the distances from the shafts 12 are equal.

As shown in FIG. 3, the second link member 8 has a pair of plate-like members 17, and a locking bar 21 is integrally formed between one end of each plate-like member 17. In addition, a pair of plate-like bodies 1
A thick wall portion 21a is integrally formed on an inner portion of a connecting portion between the locking rod 7 and the locking rod 21 so that both ends of the locking rod 21 project in a pin shape. This thick part 21
Due to a, the rigidity of both ends of the pin-shaped locking bar 21 is improved, and the locking bar 21 can be pressed into the holding portion 27 of the holder plate 25.

At the other end of each plate-like body 17, locking pins 23 and 24 are formed. Each of the locking pins 23 and 24 is connected to the key top 1 via the locking guide 5a.
Is snapped into the locking groove 5 of the locking portion 3. Further, shaft holes 20 are respectively formed at central positions facing each other outside the plate-like members 17, and these shaft holes 20 are provided in the respective plate-like members 9 of the first link member 7. Are rotatably fitted to each other. Thereby, both link members 7 and 8 are connected to each shaft body 12 and shaft hole 2.
The shafts 12 and the shaft holes 20 form a shaft support A.

Further, both ends of each plate 17 in the second link member 8 are the same as those in the first link member 7 shown in FIGS.
As shown in FIG. 4 and the like, it is formed to be thinner than the thickness of the central portion in side view. The locking bar 21 of the second link member 8 and the locking pins 23 and 24 are configured so that the distance from the shaft hole 20 is equal.

As shown in FIGS. 4 and 5, the first link member 7 and the second link member 8 are formed to have substantially the same length in a side view. It is configured to be substantially horizontal.

Between the central positions of the plate-like members 17, they are placed on the upper surface of a rubber spring 35, which will be described later, and when the key top 1 is pressed, each of the link members 7, 8 is pressed.
A pressing portion 18 is provided for pressing down the rubber spring 35 in accordance with the mutual rotation. Pressing part 18
, The rubber spring 3
5 is pressed to perform a switching operation.

As shown in FIG. 6, a depression 18a is formed on the surface of the pressing portion 18 on the key top 1 side. The concave portion 18a reduces the amount of components used for the second link member 8 and prevents sinking of the resin of the pressing portion 18 during injection molding.

A resin holder plate 25 is provided below the guide support member 6, and the holder plate 25 has a locking portion 26 and a holding portion 27 corresponding to each switch device. Have been. In addition, although each of the locking portion 26 and the holding portion 27 is provided with two each, FIG. 1 shows one locking portion 26 and the holding portion 27 each.

The locking portion 26 is formed with a sliding groove 32 having the right side in FIG.
The locking pins 15 and 16 formed on the first link member 7 are inserted into the sliding grooves 32 of No. 6. A restriction wall 26a whose upper part is closed is erected on the side opposite to the opening of the slide groove 26, and the restriction wall 26a allows the first link member 7 to move inwardly of the locking pins 15 and 16. Restricts sliding.

The holding portion 27 is formed by a first guide portion 28 and a second guide portion 29.
0 is formed, and both ends of a locking rod 21 formed at one end of the second link member 8 are held in the rotating groove 30. The groove 28 is provided outside the first guide portion 28.
a, and the elasticity of the first guide portion 28 is increased by the groove portion 28a. Here, the first guide portion 28 and the second guide portion 29 cooperate to form an elastic holding wall.

Thus, the locking pins 15, 16 of the first link member 7 of the guide support member 6 are slid on the holder plate 25 from the open side of the slide groove 32,
The locking pins 15 and 16 are inserted into the sliding grooves 32. Further, the locking rod 21 of the second link member 8 is
5 by pressing against the holding portion 27 of the first guide portion 2.
The elastic rod 8 moves elastically, and the locking rod 21 is held in the rotation groove 30.

The holder plate 2 configured as described above
As shown in FIG. 6, a flexible circuit board 40 on which a switch electrode 40a is formed corresponding to each key switch is disposed below the key switch 5, and an inverted cup-shaped board corresponding to the switch electrode 40a. Rubber spring 35 is mounted on the flexible circuit board 40.

Further, the switch electrode 40 on the circuit board 40
A movable electrode (not shown) is fixed to the inner top wall of the rubber spring 35 so as to oppose a. The pressing portion 18 formed on the second link member 8 is disposed on the upper surface of the rubber spring 35.

As a result, when the pressing portion 18 moves downward with the pressing of the key top 1, the rubber spring 35
Is depressed by the depressing portion 18, and when the pressing amount exceeds a certain depressed amount, the rubber spring 35 buckles, and the movable electrode 40 a and the switch electrode 40 a on the flexible circuit board 40 abut, and a switching operation is performed.

A switch support plate 42 is provided below the flexible circuit board 40. The switch support plate 42 is provided above each of the circuit boards 40,
This supports the holder plate 25.

Next, a method of assembling the key switch configured as described above will be described with reference to FIGS.

First, the flexible circuit board 40 and the holder plate 25 are placed on the switch support plate 42, and each shaft 12 of the first link member 7 is fitted into each shaft hole 20 of the second link member 8. Then, the guide support member 6 is assembled. At this time, as shown in FIGS. 4 and 5, the first link member 7 and the second link member 8 are formed to have substantially the same length in a side view, and become substantially horizontal in a folded state. In addition, the first link member 7 and the second link member 8 can be made compact to improve their handling.

Thereafter, the respective link members 7 and 8 are rotated to each other so as to be in the state shown in FIG. Then, the locking rod 21 of the second link member 8 is arranged on the guide portion of the holding portion 27 while sliding into the sliding groove 32 on the holder plate 25 from the above. In this case, in order to lock the locking pins 15 and 16 of the first link member 7 in the sliding groove 32, it is sufficient to simply slide the locking pins 15 and 16 into the sliding groove 32, Each locking pin 15, 16
Since it is not necessary to use the resin elasticity of the above, each locking pin 15, 16 can be easily locked in the sliding groove 32.

As described above, with the locking pins 15 and 16 slidably locked in the sliding groove 32, the locking rod 21 and the rotating groove 30 are positioned so as to face each other. It is not necessary to particularly position the locking rod 21 and the rotation groove 30.
From this state, the locking bar 21 is pressed into the rotating groove 30 and clamped. At this time, the first guide portion 28 of the holding portion 27 forming the elastic holding wall is elastically moved and easily elastically deformed with the press-fitting of the locking bar 21, and thus the locking bar is 2
1 can be easily clamped. The connecting portion between the pair of plate-like members 17 and the locking bar 21 in the second link member 8 has a thick-walled inner portion so that both ends of the locking bar 21 protrude in a pin shape. The thick part 21a is formed integrally, and the rigidity of both ends of the pin-shaped locking rod 21 is improved by the thick part 21a. It can be pressed into the holding portion 27 of the plate 25. This completes the connection between the guide support member 6 and the holder plate 25 (FIG. 5).
And FIG. 6).

At this time, the second supporting member 6
The pressing portion 18 formed on the link member 8 is mounted on the upper surface of the rubber spring 35 as shown in FIG.
Because it receives the urging force of the rubber spring 35,
Both the first link member 7 and the second link member 8 are in an obliquely inverted state.

Next, as shown in FIG. 6, the first spring held in an inverted state by the urging force of the rubber spring 35 is used.
The locking bar 13 of the link member 7 and the locking groove 4 of the key top 1 are opposed to each other, and the locking pins 23 and 24 of the second link member 8 and the key top 1 are also held in an inverted state. The stop groove 5 is made to face. At this time, the locking rods 13 and the locking pins 23 and 24 of the link members 7 and 8 are locked by the key top 1 in a state where the link members 7 and 8 are inverted based on the urging force of the rubber spring 35. Since the locking groove 4 of the portion 2 and the locking groove 5 of the locking portion 3 are opposed to each other, the locking rod 13 of each link member 7, 8 and each locking pin 23, 24 can be easily visually recognized. Thereby, the locking rod 13, the locking pins 23 and 24, and the locking portions 2 and 3 of the key top 1 can be easily opposed.

Thereafter, the key top 1 is lightly pressed down against the urging force of the rubber spring 35 (downward direction in FIG. 6). At this time, the key top 1 can be smoothly guided to the link members 7 and 8 by the guide ribs 50, 51, 52, and 53 provided on the back surface of the key top 1. Thereby, the locking rod 13 of the first link member 7 is snapped into the locking groove 4 while being guided by the locking guide portion 4a, and at the same time, each locking pin 23, 2 of the second link member 8 is locked.
4 is snapped into the locking groove 5 while being guided by the locking guide portion 5a. Such a state is shown in FIGS.

At this time, a thick portion 13a formed to be thick in plan view is formed inside the locking bar 13 formed between one end of the pair of plate-like members 9 in the first link member 7. Since the rigidity of the locking bar 13 is improved by the thick portion 13a, the locking groove of the key top 1 is formed via the locking guide portion 4a without deforming the locking bar 13. 4
Can be snap-in (press-fit) inside. Thus, the connection between the guide support member 6 and the key top 1 is completed.

The assembly of the key switch is completed by the above operation.
The connection work with the key top 1 can be performed extremely easily, thereby simplifying the work of assembling the key switch, shortening the assembling time, and assembling the key switch reliably. It is.

Next, the operation of the key switch assembled as described above will be described. When the key top 1 is pressed down, the key top 1 is rotated downward in the locking hole 4 of the locking portion 2 of the first link member 7 as the key top 1 moves downward, and the second link is rotated. Locking pin 2 of member 8
The reference numerals 3 and 24 slide horizontally in the locking groove 5 of the locking portion 3. At the same time, the locking rod 21 of the second link member 8 rotates clockwise in the rotation groove 30 of the holding portion 27 of the holder plate 25, and the locking pins 15 and 16 of the first link member 7 It slides horizontally in the sliding groove 32 of the locking portion 26.

As a result, the shaft supporting portion A for supporting the link members 7 and 8 with each other moves downward and gradually presses down on the rubber spring 35, and when the amount of pressing down exceeds a certain limit, the rubber support 35 is pushed down. The spring 35 is buckled.
Thereby, the movable electrode (not shown) in the rubber spring 35 is connected to the switch electrode 4 on the flexible circuit board 40.
0a is short-circuited and predetermined switching is performed.

At this time, since both end portions of the first link member 7 and the second link member 8 are formed thinner than the thickness of the central portion in side view as described above, the key top 1 is formed. To perform switching operation by pressing
Even if the ends of both link members 7 and 8 approach each other due to the lowering operation of the key top 1, the contact of the ends during the lowering of the key top 1 is based on the fact that each end is formed thin. Is prevented. Therefore, the lowering operation of the key top 1 is not hindered halfway, and good key operability can be realized while maintaining a large key stroke.

When the key top 1 is released from being depressed, the shaft supports A of the link members 7 and 8 are pushed upward by the elastic restoring force of the rubber spring 35. Accordingly, the locking bar 13 and the locking pins 15 and 16 of the first link member 7 and the locking bar 21 and the locking pins 23 and 2 of the second link member 8 are connected.
4 performs an operation reverse to the above-described operation, and as a result, the key top 1 returns to the original position.

Here, each of the locking rods 13 and 21 does not move in the horizontal direction, but each of the locking grooves 4 and
Since the key top 1 is only rotated by the rotation groove 30, the key top 1 is not moved in the horizontal direction, but is moved up and down while the horizontal state of the key surface of the key top 1 is maintained.

The present invention is not limited to the first embodiment described in detail above, and various changes can be made without departing from the gist of the present invention. For example,
The locking bar 21 of the second link member 8 in this embodiment may be a locking pin formed on each plate 17. In addition, the holding portion 27 formed on the holder plate has only the resin-specific elasticity of the first guide portion 28 and the second guide portion 29,
The locking bar 21 may be sandwiched.

Next, a second embodiment will be described with reference to FIGS. In the second embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The second embodiment differs from the first embodiment in the structure of the holding portion 27. As shown in FIGS. 9 and 10, the holding portion 61 in the second embodiment extends over the holder plate 25 over one side of a substantially rectangular area where the key switch device is arranged in plan view.
And a resilient piece 63 which stands on the holder plate 25 near both ends of the wall portion 62 and faces the rubber spring 35 of the wall portion 62 at a predetermined interval. Formed from The wall portion 62 and each elastic piece 63 cooperate to form an elastic holding wall. A groove 62a is formed outside the wall 62 to increase the elasticity of the wall 62.

The elastic piece 63 is a rubber spring 35
As shown in FIG. 9, the protrusion 6 protrudes toward the wall 62 at the upper end thereof.
3a are formed.

In the second embodiment, as shown in FIG. 10, in the vicinity of the inside of both locking portions 26, a bending preventing wall 64 is provided upright from the holder plate 25 at a predetermined interval from the locking portions 26. Have been. When the first link member 7 is bent inward and the locking pins 15 and 16 are locked by the locking portions 2,
6 is prevented.

In the method of assembling the key switch of the second embodiment formed as described above, the flexible circuit board 40 and the holder plate 25 are mounted on the switch support plate 42, similarly to the key switch of the first embodiment. And the first
The guide support member 6 is assembled by fitting each shaft 12 of the link member 7 into each shaft hole 20 of the second link member 8. At this time, as shown in FIGS. 4 and 5, the first link member 7 and the second link member 8 are formed to have substantially the same length in a side view, and become substantially horizontal in a folded state. , First
It is possible to make the link member 7 and the second link member 8 compact and improve the handling thereof.

Thereafter, the link members 7 and 8 are rotated relative to each other so that the locking pins 15 and 16 of the first link member 7 are moved from the opening side of the sliding groove 32 in the locking portion 26 to the holder plate 2.
5 while sliding toward the inside of the sliding groove 32.
The locking bar 21 of the link member 8 is disposed on the holding portion 61.
In this state, the amount of bending of the first link member 7 toward the inside of the plate-like body 9 is regulated by the deflection preventing wall 64, and the locking pins 15 and 16 are prevented from coming off the locking portion 26.

The locking pin 15 of the first link member 7
16 is locked in the sliding groove 32 by using each locking pin 1
The guide pins 5 and 16 need only be slid into the slide groove 32, and it is not necessary to use the resin elasticity of the lock pins 15 and 16; It can be locked easily. As described above, in a state where the locking pins 15 and 16 are slidably locked in the sliding grooves 32, the locking bar 21 and the holding portion 61 are positioned so as to face each other. It is not necessary to particularly position the 21 and the holding portion 61.

From this state, the locking bar 21 is pressed into the holding portion 61. With this press-fitting, the elastic piece 63 is elastically deformed toward the rubber spring 35, and the locking bar 21 is
Is sandwiched within. In this state, the locking rod 2 is
1 is restricted, and the protrusion 63 at the upper end of the elastic piece 63 is
a prevents the locking bar 21 from coming off the holding portion 61. By this press-fitting, the connection between the guide support member 6 and the holder plate 25 is completed.

As described above, with the locking pins 15 and 16 of the first link member 7 locked in the sliding grooves 32 of the locking portion 26, the locking bar 21 of the second link member 8 is held on the holding portion 61. At the time of locking, the elastic piece 63 constituting a part of the holding portion 61 is elastically deformed, and the locking bar 21 of the second link member 8 is moved to the two elastic pieces 63.
And the wall portion 62 so as to be easily rotatable and locked.

Next, the locking rod 13 of the first link member 7 and the locking groove 4 of the key top 1 are made to face each other, and the locking pins 23 and 24 of the second link member 8 are engaged with the key top 1. Stop groove 5
Are pressed, and the key top 1 is lightly pressed down. At this time, the key top 1 can be smoothly guided to the link members 7 and 8 by the guide ribs 50, 51, 52, and 53 provided on the back surface of the key top 1.

Thus, the locking rod 1 of the first link member 7
3 is snapped into the locking groove 4 while being guided by the locking guide portion 4a. At the same time, the locking pins 23 and 24 of the second link member 8 are guided into the locking groove 5 while being guided by the locking guide portion 5a. Snapped into Thus, the connection between the guide support member 6 and the key top 1 is completed. After that, when the key top 1 is released from being pressed, the key top 1 is urged upward based on the elastic force of the rubber spring 35, and FIG.
Is held at the non-pressed position of the key top 1 shown in FIG.

The assembly of the key switch according to the second embodiment is completed by the above-mentioned operation. However, as in the case of the key switch according to the first embodiment, the connecting operation between the link members 7, 8 and the holder plate 25 and the key top 1 is performed. Can be performed very easily, thereby simplifying the operation of assembling the key switch, shortening the assembling time, and assembling the key switch reliably.

Next, when the key top 1 of the assembled key switch is to be detached by replacement or the like, the key top 1 is pulled up, and the locking pins 15, 1 of the link members 7, 8 are lifted.
6, 23, 24, key top 1 and boulder plate 25
A load is applied to each of the locking portions 2, 3, 26 and the holding portion 61.
In the holding portion 61 of the holder plate 25, a force is applied to the locking bar 21 of the first link member 7 in the upper right or upper direction in FIG. 9, but the locking bar 21 is held on the right and upper sides by the elastic pieces 63. Therefore, the locking bar 21 does not come off the holding portion 61.

On the other hand, in the locking groove 4 of the key top 1, a force is applied to the locking rod 13 of the first link member 7 from the lower right to the lower side in FIG. 1 to elastically deform the locking guide portion 4a. As a result, the locking rod 13 comes off the locking groove 4.

When the key top 1 is lifted, a force is applied to the locking pins 15 and 16 of the first link member 7 at the locking portions 26 of the holder plate 25 in the upper left or upper direction in FIG. At this time, the plate-like body 9 of the first link member 7
Is elastically bent inward, but the plate-like body 9 is not bent.
, The movement toward the inside is restricted. Therefore, the amount of bending of the plate-like body 9 does not become so large that the locking pins 15 and 16 come off the sliding groove 32.

On the other hand, in the locking portion 3 of the key top 1, a force is applied to the locking pins 23 and 24 of the second link member 8 from the lower left to the lower direction in FIG. The body 17 elastically bends inward, and the locking pins 23, 24
Is removed from the sliding groove 5 of the locking portion 3. As a result, only the key top 1 comes off the guide support member 6, and the key top 1 can be replaced. At this time, the guide support member 6 does not come off the holder plate 25.

[0075]

As described above, according to the key switch device of the first aspect, when the lower end portions of the first link member and the second link member are locked to the respective locking portions of the holder member. On one of the link members is formed a pair of turning ends rotatably locked to the locking portion of the holder member, and a thick portion is formed inside the turning end. So
The rigidity of each rotating end is improved by such a thick portion, and the rotating end can be easily rotated and locked to the locking portion of the holder member without deforming each rotating end. This makes it easy to assemble the link member that guides the key top up and down and the holder member.

Further, since the first link member and the second link member have the end portions formed to be thinner than the thickness of the central portion in side view, the key top is depressed as described above. When performing the switching operation, even if the respective ends of both link members approach each other with the lowering operation of the keytop, based on the fact that each end is formed in a thin shape, the lowering of the keytop during the lowering of the keytop Contact of each end is prevented. Therefore, the lowering operation of the key top is not hindered halfway, and good key operability can be realized while maintaining a large key stroke.

According to the key switch device of the second aspect, when the upper ends of the first link member and the second link member are locked to the lower surface of the key top, the other of the two link members is provided with a key. A pair of rotating ends that are rotatably locked on the lower surface of the top are formed, and a thick portion is formed inside the rotating end. The rigidity of the portion is improved, and it is possible to easily and rotatably lock the lower surface of the key top without deforming each rotating end. Thus, the key member can be easily assembled with the link member that guides the key top up and down.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a key switch according to a first embodiment.

FIG. 2 is a plan view showing a configuration of a first link member used for the key switch of the first embodiment.

FIG. 3 is a plan view showing a configuration of a second link member used for the key switch of the first embodiment.

FIG. 4 is an explanatory view showing a state before a guide support member used for the key switch of the first embodiment is connected to a holder plate.

FIG. 5 is an explanatory view showing a state after the guide support member is connected to the holder plate at the time of assembling the key switch according to the first embodiment.

FIG. 6 is an explanatory view showing a state in which a key top is opposed to a guide support member when assembling the key switch of the first embodiment.

FIG. 7 is an explanatory diagram showing a state in which a keytop is snapped into a guide support member used for the key switch of the first embodiment.

FIG. 8 is a cross-sectional view illustrating the configuration of the key switch according to the first embodiment.

FIG. 9 is a longitudinal sectional view showing a configuration of a key switch according to a second embodiment.

FIG. 10 is a plan view illustrating a configuration of a holder plate and a first link member according to a second embodiment.

FIG. 11 is a longitudinal sectional view showing an embodiment embodying the configuration of a conventional key switch.

FIG. 12 is a plan view showing a configuration of a first link member used for a conventional key switch.

FIG. 13 is a plan view showing a configuration of a second link member used for a conventional key switch.

DESCRIPTION OF SYMBOLS 1 Key top 2 Locking part 3 Locking part 7 First link member 8 Second link member 13 Locking rod 13a Thick part 15, 16 Locking pin 21 Locking rod 21a Thick part 23, 24 Locking Pin 25 Holder Plate 26 Locking Portion 35 Rubber Spring 40 Flexible Circuit Board 40a Switch Electrode 61 Nipping Portion 62 Wall Portion 63 Elastic Piece

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeyuki Takagi 15-1 Naeshiro-cho, Mizuho-ku, Nagoya-shi Inside Brother Industries, Ltd. (72) Inventor Isao Mochizuki 15-1 Naeshiro-cho, Mizuho-ku, Nagoya-city Brother Industrial Co., Ltd. In-company (72) Inventor Hiroaki Okada 15-1 Naeshiro-cho, Mizuho-ku, Nagoya-shi F-term (reference) 5G006 AA01 AB25 AC03 BA01 BB03 BC04 CB01 CD05 FB08 LB01

Claims (2)

[Claims] 1. A key top, a holder member disposed below the key top and formed with a plurality of locking portions, and a coupling member connected to a lower surface of the key top and a plurality of locking portions of the holder member. 1st to guide the key top up and down
A key switch device comprising: a link member, a second link member, and a biasing unit that biases the key top upward, and performs a switching operation in accordance with the vertical movement of the key top, wherein the first link member Alternatively, one of the second link members is formed with a pair of rotating ends that are rotatably locked to the locking portions of the holder member, and a thick portion is formed inside the rotating ends. The key switch device according to claim 1, wherein the first link member and the second link member each have an end portion formed to be thinner than a thickness of a central portion in a side view. 2. A pair of rotating ends, which are rotatably locked to a lower surface of the key top, are formed on the other of the first link member and the second link member. The key switch device according to claim 1, wherein a thick part is formed inside the key switch.