JP3318317B2 - Key switch device - Google Patents

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 suitable for use in a thin keyboard attached to a notebook type word processor, a notebook type personal computer or the like.

[0002]

2. Description of the Related Art Conventionally, a key switch device generally has a structure in which an insulating film circuit board is sandwiched between a holder member and a switch support plate, as described in the specification and drawings attached to Japanese Patent Application No. 3-330160. have.

On the film circuit board, a fixed contact pattern in which two types of switching circuits and fixed contacts extending from each circuit are combined in a comb-like pattern is printed, and the fixed contact pattern is formed at a position corresponding to the fixed contact pattern. Is provided with a rubber spring formed in an inverted cup shape. A movable contact is provided inside the rubber spring, and a switching operation is performed by depressing the rubber spring.

An actuator is mounted on the holder member corresponding to the rubber spring, and a key top is mounted on the upper end of the actuator. When the operator depresses the key top, the actuator guides the key top to the upper part of the corresponding rubber spring, and depresses the rubber spring. When the pressing amount exceeds a certain amount, the movable contact inside the rubber spring comes into contact with the fixed contact pattern, and the switching operation is performed by short-circuiting between the fixed contacts.

[0005] The switch support plate corresponds to a lower cover of the keyboard device, and enhances the rigidity of the keyboard device and increases the reliability of key input.

[0006]

However, in recent years, as word processors, personal computers, and the like have become smaller, thinner, lighter, and less expensive, keyboards attached to them have been similarly made smaller and thinner. I have.

On the other hand, it is required that the movable portion of the key be ergonomically excellent in operability (generally, the amount of perception of pushing down is 3 to 4 mm). Therefore, it is necessary to meet the above-mentioned requirements while securing the pushing stroke.

However, many parts and holder members around the key actuator are mainly manufactured using a resin material, and the processing method is mainly formed by injection molding. Therefore, the minimum thickness of each member is required to be at least 1.5 mm. This means that as the number of components to be stacked increases, it becomes more difficult to reduce the thickness, and the weight naturally increases.

Further, the conventional key switch device has a three-layer structure of a holder member, a film circuit board, and a switch support plate. If the three layers are not properly aligned without gaps, the reliability of key operation response is lacking. For this reason, there is a type which has been subjected to processing for suppressing the floating of the three layers for each key or at regular intervals, but the processing requires considerable time and effort.

Further, since a holder member for guiding the vertical movement of the key top at the time of operating the key top is required, the number of components constituting the key switch device increases, and the cost of the entire key switch device increases. Will bring up.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to cope with downsizing and thinning of a keyboard and to secure sufficient keystrokes. There is also provided a key switch device which facilitates the key input operability and enables reliable key input by smoothing the movable operation of the lower end portion of the two link members for guiding the vertical movement of the key top. The purpose is to:

[0012]

In order to achieve the above object, a key switch device according to the present invention comprises a support member made of a plastically deformable metal material and having a plurality of locking portions projecting therefrom; A switching unit disposed on the support member ,
A spring member for actuating the switching portion, Split
And a resin key top disposed above the ring member, made of as well as guiding and supporting the key <br/> Toppu vertically, a first link member and a second link member connected to the movable state mutually and a guide support member, a key switch for performing a switching operation by the switching section via the Motozukisu pulling member to the pressing operation of the key Toppu, first
The upper end of the upper end portion及beauty second link member of the link member
And it was allowed movably locking the lower side of the key Toppu, the lower end of the lower end and a second link member of the first link member, the upper surface and a plurality of supporting <br/> support member movable self between the inner peripheral surface of the locking portion
Are locked in place.

[0013]

In the key switch device having the above configuration, when the key top is pressed down, the key top is guided downward via the guide support member. Further, when the keytop is pressed, the switching unit is activated via the spring member.
Activated and a switching operation is performed.

At this time, the first phosphorus in the guide support member
The upper end of the link member and the upper end of the second link member are keyed.
It is movably locked to the lower surface side of the top and the first
The lower end of the link member and the lower end of the second link member are
Upper surface and a plurality of which are protruded from the support member of the supporting support member
It is movably locked between the inner peripheral surface of the locking part
Therefore , the movable operation becomes smooth, the operability of key input is good, and it is possible to perform key input reliably.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0016] Figures 1 and 2 show a board 1 of the key switch device of the present embodiment. The substrate 1 is made of a plastically deformable metal such as iron or aluminum, and its surface is subjected to resist printing as an insulating process. A first electrical circuit pattern for switching is printed on the insulated surface with a conductive paint such as silver, and an insulating print is applied to a portion corresponding to an intersection between the second electrical circuit pattern and the first circuit pattern. after the second circuit pattern is printed by similarly conductive paint. At regular intervals, fixed contacts in the shape of keys extending from two circuit patterns are combined to form a fixed contact pattern 2.

[0017] Incidentally, perform carbon coating on portion corresponding to the fixed contact pattern 2 and a connector (not shown), the other circuit surface by performing a resist printing, thereby preventing deterioration due to oxidation of the printed circuit pattern. In some cases, a protective film is adhered on the circuit surface to protect the circuit surface during plastic working.

Around the fixed contact pattern 2, mounting portions 1a and 1c of the guide support member 6 are formed integrally with the substrate 1 by press working. The mounting portions 1a and 1c are formed so as to surround the fixed contact pattern 2 and to be arranged in a rectangular shape at four points on the upper, lower, left and right sides. The mounting portion 1a has a structure in which two locking shafts 8a of the guide support member 6 described later are rotatably locked, and the mounting portion 1c has a structure in which the two locking pins 7a are horizontally slidably locked. I have.

As described above, between each mounting portion 1a integrally formed on the substrate 1 and rotatably locking the locking shaft 8a and the mounting portion 1c for slidably locking the locking pin 17a. Is provided with a spring disposing portion R for disposing a rubber spring 4 described later (see FIG. 2).

That is, the mounting portion 1a is integrally formed in a convex shape from the substrate 1 and is processed into an arc shape so as to have a locking hole sufficient for the locking shaft 8a to rotate. The mounting portion 1c that slides and locks is formed integrally with the substrate 1 in a convex shape, and is formed into a U-shape as viewed from the horizontal direction so as to have a long hole-like locking groove.

In general, a large number of fixed contact patterns 2 are regularly and vertically arranged, and two types of mounting portions 1a, 1
c are also formed so as to be arranged in the same row.

By the way, the mounting portion 1a on the substrate 1 of embodying the key switch of the present invention, the formation of 1c is carried out as follows.

First, a hinge portion (a portion corresponding to the mounting portion 1a or 1c) is formed at a predetermined portion on the substrate 1 by removing a portion corresponding to the U-shaped blank portion 1b. hereinafter referred to as blanking), then the mounting portion 1a by press bending the hinge portion, 1c is formed. However, in the blank processing of a metal plate, press processing is generally often used from the viewpoint of cost. Since blank processing by press processing is processing of shearing and breaking through a die by a punch as a punching die, sagging occurs on the upper surface and burrs 11 occur on the rear surface when viewed from the surface to be pressed. The burrs 11 hinder the smooth movement of the locking pin. When blanking is performed from the back surface, burrs 11 that hinder the movement of the locking shaft 8a and the locking pin 7a are formed on the boundary of the blank portion 1b on the front surface of the substrate 1.

In order to prevent the harm, as shown in FIG.
The locking shaft 8a and the locking pin 7a near the mounting portions 1a and 1c.
The thick film 3 is printed on a part of a predetermined portion of the substrate 1 touched by the thick film 3. Due to the presence of the thick film 3, the locking shaft 8 a and the locking pin 7 a are mounted on the thick film 3 as shown in FIG. FIG. 9 shows a state in which the locking pin 7a is on the thick film 3.

Since the thickness of the thick film 3 is sufficiently large with respect to the height of the burr 11, the locking shaft 8a and the locking pin 7a can move smoothly without being caught by the burr 11. Here, the locking shaft 8a is rotated between the inner peripheral surface of the mounting portion 1a and the thick film 3, and at this point, the locking shaft 8a is formed on the upper surface of the substrate 1 between the two mounting portions 1a. The thick film 3 acts as a rotation assisting member for the locking shaft 8a. In addition, locking pin 7
a is slid between the inner peripheral surface of the mounting portion 1c and the thick film, as shown in FIG.
The thick film 3 formed on the upper surface of the substrate 1 during the period c serves as a sliding aid for the locking pin 7a.

The substrate 1 is provided with holes (corresponding to the blank portions 1b) when the mounting portions 1a and 1c are formed. The holes function as cooling holes, thereby providing excellent heat radiation. Has an effect.

The same effect as that of the thick film 3 can be obtained by forming a protruding surface in the vicinity of the mounting portions 1a and 1c by performing light pressing from the back surface of the substrate 1 other than printing the thick film 3. Of course, it plays.

FIGS. 3 and 4 show the configuration of the key switch device of the present embodiment. Fixed contact pattern 2 on substrate 1 described above
A rubber spring 4 in the shape of an inverted cup is placed on a spring disposition portion R located at a position corresponding to. The rubber spring 4 has a well-known movable contact inside, and a pressing portion 82 of a shaft supporting portion A of the guide support member 6 described later is disposed at the center of the upper surface thereof. At this time, the rubber spring 4 is arranged adjacent to both of the two thick films 3. Thus, the rubber spring 4
Are disposed adjacent to each other between the two thick films 3 acting as a rotation assisting member for the locking shaft 8a and a sliding assisting member for the locking pin 7a. The rubber springs 4 can be arranged in a compact manner in relation to the fixed contact patterns 2 provided.

[0029] More thereto, the shaft support A is moved downward in association with the depression of the key top 5, the pressed portion 82 thereof presses weight depresses the rubber spring 4 exceeds a certain limit,
The rubber spring 4 buckles, and the movable contact in the rubber spring 4 short-circuits the fixed contact pattern 2.

FIG. 4 is an exploded perspective view of the key switch device. In FIG. 4, the key top 5 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. ing. In addition, from the back surface of the key top 5, the rotation locking portion 5a and the sliding locking portion 5b correspond to the mounting portions 1a and 1c on the substrate 1, and are integrally formed with the key top main body 5 downward. Is provided.

The rotation locking portion 5a has a locking hole for rotatably locking a locking shaft 7b formed at one end of one of the two link members 7, 8 to be described later. In the sliding locking portion 5b, a locking groove is formed to lock the locking pin 8b formed at one end of the other link member 8 so as to be slidable in the horizontal direction. ing.

Below the key top 5, a guide support member 6 for guiding and supporting the vertical movement of the key top 5 is provided. The guide support member 6 is composed of two link members 7, 8.

As shown in FIGS. 3 and 5, one link member 7 is formed in a U-shape in a plan view, and has a pair of plate members 71. The locking shaft 7b is integrally connected and formed, and a locking pin 7a is formed outward at the other end of each plate-like body 71. Further, shafts 7c are formed inward at central positions inside each plate 71 that oppose each other, and the shafts 7c are connected to each plate 81 of the link member 8 described later.
Are rotatably supported by the respective shaft holes 8c formed in the holes.

Further, the other link member 8 has a pair of plate-like members 81 as shown in FIGS.
A locking shaft 8a is integrally formed outwardly at one end of the plate-shaped member 81, and a locking pin 8b is formed outwardly at the other end of each plate-like body 81. In addition, each plate-like body 8
1, between the central positions on the upper side of the rubber spring 4 and the key top 5.
A pressing portion 82 is provided for pressing down the rubber spring 4 in accordance with the mutual rotation of the link members 7 and 8 at the time of pressing. Thus, the pressing portion 82 presses the rubber spring 4 in accordance with the pressing of the key top 5 to perform a switching operation.

A shaft hole 8c is provided at a central position facing each other on the outside of each plate 81, and each plate 8 of the link member 7 is provided in each shaft hole 8c.
Each of the shaft bodies 7c formed on the shaft 1 is rotatably supported. As a result, the link members 7, 8 are rotatable crossing each other via the respective shafts 7c and the shaft holes 8c. Thus, a shaft support A is formed by the shaft 7c, the shaft hole 8c, and the pressing portion 82.

The locking pin 7a and the locking shaft 7b of the link member 7 are arranged in a straight line with the shaft 7c as a center, and the distance from the shaft 7c is equal. The locking pin 8b of the link member 8 and the locking shaft 8a are
They are arranged so as to be aligned on a straight line with c as the center, and have the same distance from the shaft hole 8c.

Further, as shown in FIG.
Is rotatably locked in a locking hole formed in the rotation locking portion 5a of the key top 5 by a locking shaft 7b of the link member 7. Further, the locking pin 7a is locked to the mounting portion 1c formed on the substrate 1 for sliding locking. In addition, the locking shaft 8a of the link member 8 is
Is rotatably locked to a mounting portion 1a which is formed to be rotatable and locked. Further, the locking pin 8b is slidably locked in a locking groove formed in the sliding locking portion 5b of the key top 5 described above.

Further, as shown in FIG. 3, both link members 7 and 8 are formed such that the thickness of the tip of each plate-like body 71 and 81 is reduced. Therefore, even when the key top 5 is pressed, the respective ends of the plate-like bodies 71 and 81 of the link members 7 and 8 do not come into contact with each other during the pressing of the key top 5. Therefore, the key top 5 is configured so that the pressing operation is not hindered on the way and the key stroke can be sufficiently secured.

Next, the operation of the key switch device having the above configuration will be described. FIG. 7 is a sectional view of the key switch device.

In FIG. 7, when the key top 5 is depressed downward, the locking shaft 7b of the link member 7 moves counterclockwise in the locking hole of the rotation locking portion 5a as the key top 5 moves downward. And the locking pin 8 of the link member 8
b slides horizontally (rightward in FIG. 7) in the locking groove of the sliding locking portion 5b. At the same time, the locking shaft 8a of the link member 8 rotates clockwise in the locking hole of the mounting portion 1a of the board 1 which is rotatably locked, and the locking pin 7a of the link member 7 slides. It slides horizontally (rightward in FIG. 7) within the locking groove of the mounting portion 1c to be stopped.

As a result, the shaft supporting portion A for supporting the link members 7 and 8 with each other moves downward and gradually presses the rubber spring 4, and when the pressing amount exceeds a certain limit, the rubber spring 4 is pressed. The spring 4 is buckled. Thereby, the movable contact in the rubber spring 4 short-circuits the fixed contact pattern 2 on the substrate 1 and a predetermined switching operation is performed.

When the key top 5 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 4. Accordingly, the locking shaft 7b, 8a,及Beauty locking pin 7a, 8b performs the inverse operation as described above, this result, the key top 5 is returned to its original position.

[0043] Here, the locking shaft 7b, 8a without being moved in the horizontal direction, since it is only rotated in the respective locking holes, the key top 5 be moved in the horizontal direction . Therefore , the keys do not collide with the adjacent keys, and are moved up and down while the horizontal state of the key surface of the key top 5 is maintained.

[0044] La bar spring 4 is a side view substantially trapezoidal, as described above, the angle of the sides due to the length and height of the upper base length and the lower base will depend on the desired key touch. Further, the height of the trapezoid, that is, the height of the rubber spring 4 is determined according to the keystroke, and a higher one is preferred. However, given the overall thickness of the device,
Obviously, the rubber spring 4 cannot be so large.

Further, as described above, the thickness of the plate-like bodies 71, 81 of both link members 7, 8 at the tip side is reduced in side view, so that the keystroke operation is not hindered halfway. Sufficient stroke can be secured.

As described above, the key switch device of the present invention can increase the key stroke in accordance with the thinning of the keyboard by forming the circuit board, the holder member, and the switch support plate into one structure. Therefore , it is possible to provide a key switch device that has good key operability and can reliably perform key input, and that is highly effective in reducing the number of parts, facilitating assembly, and reducing the weight of the device.

Here, in the substrate 1, the two mounting portions 1
a, the thick film 3 formed on the upper surface of the substrate 1
The thick film 3 formed on the upper surface of the substrate 1 between the two mounting portions 1c is provided with a locking pin 7a.
, The turning operation of the locking shaft 8 and the sliding operation of the locking pin 7a can be performed extremely smoothly during key operation, and the key operability is further improved.

In general, a logic board, a storage device, and a power supply of a portable computer are often arranged under a keyboard, and there is a problem in measures against heat generated by these components. In the key switch device of the present invention, since a large number of holes (blank portions 1b) provided in the substrate function as cooling holes, heat can be effectively radiated. In this regard, the present invention also has an ideal structure.

In addition to the above effects, in particular, in the key switch device according to the present embodiment, the configuration in which the key stem is guided by the key holder can be completely eliminated.
Unlike the conventional key switch device, there is no sliding noise between the key stem and the key holder when the key is pressed, and it is not necessary to reduce the key operation area and press the center of the key. It is completely gone.

In the key switch device according to the present embodiment, the locking hole of the rotation locking portion 5a and the mounting portion 1 for rotation locking are provided.
When the key top 5 is depressed, the locking shafts 7b and 8a, which are locked in the locking hole a, only rotate in the locking hole without moving in the horizontal direction. It is not moved horizontally. Therefore, it is possible to provide a key switch device which has good key operability and can perform key input reliably without colliding between adjacent keys.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications and changes can be made without departing from the gist of the present invention.
Improvements are possible. For example, the link members 7 and 8 in the present embodiment may be the same type of members combined in a pantograph shape.

Further, in this embodiment, the link members 7, 8
The rubber spring 4 is pressed by the shaft support portion, but the rubber spring 4 may be pressed by another member provided on the link members 7 and 8 or the key top 5.

[0053]

As described in the foregoing, according to the key switch device according to the present invention, the lower surface side upper end portion of the key top of the upper end portion and a second link member of the first link member in plan the support member Yes movably so as to lock, the lower end of the lower end and a second link member of the first link member,
The upper surface of the support member and a plurality of
By movably locking the inner peripheral surface of the locking part , it is possible to secure sufficient key strokes while responding to miniaturization and thinning of the keyboard, and good key operability. In addition, it is possible to provide a key switch device capable of performing secure key input.

[Brief description of the drawings]

FIG. 1 is a top view of a substrate of a key switch device of the present embodiment.

FIG. 2 is a side sectional view of the substrate of FIG. 1;

FIG. 3 is a perspective view of a board and components of the embodiment.

FIG. 4 is an exploded perspective view of the key switch device of the embodiment.

FIG. 5 is a plan view of the link member of the present embodiment.

FIG. 6 is a plan view of another link member of the present embodiment.

FIG. 7 is a cross-sectional view of the key switch device of the present embodiment.

FIG. 8 is a diagram showing an example of the shape of thick film printing of the key switch device of the present embodiment.

FIG. 9 is an enlarged view of the vicinity of a mounting portion of the key switch device of the present embodiment.

[Explanation of symbols]

Mounting portion 2 fixed contact pattern to the mounting portion 1c sliding engagement to 1 group plate 1a rotation locking 3 thick film 4 rubber spring 5 key top 5a turning locking portion 5b Suridogakaritome section 6 guide support member 7 links Member 8 Link member R Spring arrangement part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 13/14

Claims (1)

(57) [Claims] 1. It is made of a plastically deformable metal material ,
A support member which projects a plurality of locking portions, the switching portion arranged on the support member, a spring member for actuating the switching portion, and the upward arranged a resin key top of the spring member , as well as guiding and supporting the key top in a vertical direction, mutually and a guide support member comprising a first link member and a second link member connected to the movable state, Motozukisu pulling the depressing operation of the key top a key switch for performing a switching operation by the switching section through the member, the upper end of the upper end portion及beauty second link member of the first link member, freely soluble dynamic on the lower surface of the key top Locked on
And, movably engaged with the front Symbol lower end and the lower end of the second link member, the inner circumferential surface of the upper surface and the plurality of engagement portions of the support member of the first link member A key switch device characterized by stopping.