JP5003286B2 - Key switch structure - Google Patents

Description

  The present invention relates to a key switch structure of a keyboard used as an input device in information processing equipment, measuring equipment, medical equipment, and the like, and more particularly, to a key switch structure that is thinned without impairing operability.

  2. Description of the Related Art Conventionally, in a keyboard used for a portable personal computer or the like, so-called operability is ensured that the key top descends without tilting when any part of the key top is pressed. Therefore, in the conventional key switch structure, a link mechanism is provided under the key top. As a key switch structure having a link mechanism under the key top, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 2001-229964.

  FIG. 16 shows a conventional key switch structure provided with the link mechanism disclosed in the above document. In FIG. 16, a conventional key switch 10 includes a key top 11, a first link member 12 provided to be rotatable with respect to the key top 11, and a second link provided to be slidable with respect to the key top 11. The member 13 and the key top 11 are bent by being pressed, and when the pressing force is removed, the rubber dome (elastic member) 14 and the first and second link members 12 and 13 return the key top 11 to the original position. The holder 15 for holding the membrane, the membrane sheet 16 having a contact portion immediately below the rubber dome 14, and the back plate 17 having a hole for fixing the welding pin 15 a of the holder 15. The first link member 12 and the second link member 13 constitute a link mechanism.

In the above key switch structure, even if the end of the key top 11 is pressed, the key top 11 is lowered while maintaining the horizontal state by the link mechanism including the first and second link members 12 and 13. For example, when the position of the end portion of the key top 11 indicated by an arrow in FIG. 16 is pressed, first, the right end portion of the first link member 12 is lowered. As a result, the left end portion of the first link member 12 moves to the left as indicated by the arrow. Thereby, the center part of the 1st link member 12 falls, and the 2nd link member 13 connected with the 1st link member 12 in the center part also falls. As the second link member 13 is lowered, the left end portion of the key top 11 is also lowered. As described above, even when the end of the key top 11 is pressed, the key top 11 is lowered while maintaining a horizontal state, so that there is no difference in operational feeling depending on the pressed position, that is, operability is ensured. ing.
Japanese Patent Laid-Open No. 2001-229964

However, in the above-described conventional key switch structure, the key top 11, the first and second link members 12, 13 and the holder 15 are stacked in layers, and the holder 15 has a complicated structure requiring a certain thickness. Therefore, there is a limit to thinning, and there is a problem that it cannot be used for a PDA (personal digital assistant: portable information terminal) or a small personal computer that requires portability.

  Therefore, an object of the present invention is to provide a key switch structure that is thinned without impairing the operability that there is no difference in operational feeling depending on the pressed position of the key top.

In order to solve the above-mentioned problems, the present invention provides a key top, a membrane sheet having a contact portion, a key top and the membrane sheet, the first link member and the second link member. And a key switch structure including a link mechanism that supports the key top so as to be movable up and down. A sheet-like member is disposed on the membrane sheet, and the first link member is formed in a flat plate shape as a whole. A first hole is formed in one end of the flat plate of the first link member, and the first support formed on the back surface of the key top is inserted into the first hole. The one end portion of the first link member is rotatably supported, the second link member is entirely formed in a flat plate shape, and a second hole is formed in the flat plate one end portion of the second link member. Forming and keeping the kee in the second hole Wherein one end of said second link member is supported movably by the second supporting portion formed on the back surface of the flops are inserted moving in the sheet-like member, in the surface direction of the sheet-like member possible, the third support portion for supporting the first link member by the other end portion formed in a plate shape of said first link member is fixed is superposed, the second link member a flat plate shape is formed in the other end fixed and is characterized in that a fourth support section for supporting the second link member pivotally.

According to the present invention, the sheet-like member is disposed on the upper part of the membrane sheet, the first link member is formed in a flat plate shape as a whole, and the first hole is formed in the flat plate-like end portion of the first link member. And a first support member formed on the back surface of the key top is inserted into the first hole so that one end portion of the first link member is rotatably supported, and the second link member Is formed in a flat plate shape, a second hole is formed in one flat plate end portion of the second link member, and a second support portion is formed in the second hole on the back surface of the key top. Is inserted into the second link member so that one end of the second link member is movably supported , and the sheet-like member is movable in the surface direction of the sheet-like member. a third support portion for supporting superimposed other end of Jo, flat-shaped second link member Is provided with the fourth support portion for supporting the other end portion rotatably, without impairing the operability, it is possible to thin the key switch structure.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Elements common to the drawings are denoted by the same reference numerals. FIG. 1 is an exploded perspective view showing a key switch structure of Example 1 of the present embodiment, and FIG. 2 is a cross-sectional view showing the key switch structure of Example 1 of the present embodiment.

  1 and 2, the key switch 20 of the first embodiment is provided with a key top 21, a first link member 22 provided rotatably with respect to the key top 21, and slidable with respect to the key top 21. The second link member 23 and the key top 21 are bent when pressed, and a rubber dome (elastic member) 24 that returns the key top 21 to its original position when the pressing force is removed, first and second. Resin sheet 25 holding link members 22, 23, membrane sheet 26 having a contact portion directly below rubber dome 24, disposed at the bottom of resin sheet 25, and back plate disposed at the bottom of membrane sheet 26 27.

  On the back surface of the key top 21, a support portion 21a that is inserted into a hole 23b formed in one end portion 23a of the second link member 23, and a support portion 21b that rotatably supports the one end portion 22a of the first link member 22. Is provided. As shown in FIG. 2, the support portion 21 b includes a locking portion 21 ba that is rotatably inserted into a hole 22 b formed in one end portion 22 a of the first link member 22, and one end portion 22 a of the first link member 22. The stopper part 21bb is configured to prevent the stopper part 21ba from coming off.

The 1st link member 22 consists of a flat member as a whole, and the whole is formed in the substantially U shape. As will be described later, the other end portion 22c of the first link member 22 is a portion fixed to a first support portion formed integrally with the resin sheet 25, and this portion is also formed in a flat plate shape. The first link member 22 is formed in a flat plate shape, thereby contributing to a reduction in the thickness of the key switch structure. A step portion 22d is formed at the center of the first link member 22, and a notch 22e is formed inside the step portion 22d. The notch portion 22e is coupled to the notch portion 23e of the second link member 23 so as to be rotatable with each other.

Similar to the first link member 22, the second link member 23 is composed of a flat plate-like member, and is formed in a substantially U shape. The other end portion 23c of the second link member 23 is a portion fixed to a second support portion formed integrally with the resin sheet 25 as will be described later, and this portion is also formed in a flat plate shape. The second link member 23 is formed in a flat plate shape, thereby contributing to a reduction in the thickness of the key switch structure. A step portion 23d is formed at the center of the second link member 23, and a notch portion 23e is formed outside the step portion 23d. The notch 23e is provided for connection to the first link member 22.

  The rubber dome 24 is formed in a substantially cup shape using rubber or the like as a raw material, and a contact pressing portion 24a (shown in FIG. 2) is formed projecting downward at the center of the inner surface. The rubber dome 24 bends when pressed from above, and the contact pressing part 24a presses the contact part 26g of the membrane sheet 26. The rubber dome 24 is provided inside the first and second link members 22 and 23.

The resin sheet 25 is provided in the upper part of the whole membrane sheet 26, and a first support part 28, a second support part 29, and a contact hole 25a are provided for each key switch. The first support portion 28 is provided with two strip-shaped members (cutout portions) 28 a formed by cutting out a part of the resin sheet 25. The strip-shaped member 28a is provided corresponding to the two other end portions 22c of the first link member 22, and the other end portions 22c are fixed to each other. Cutout portions 28b are formed on three sides of the strip-shaped member (cutout portion) 28a, and the elastic portion 28c is formed by bending the strip-shaped member 28a into a curved shape.

By forming this elastic portion 28c, the strip-shaped member 28a can move in the direction of arrow A (the surface direction of the resin sheet 25) shown in FIG. After the strip-shaped member 28a is moved in the direction of the arrow A, a force for returning to the original position is applied by the return force of the elastic portion 28c. The other end 22c of the first link member 22 is bonded to the strip-shaped member 28a with an adhesive 30 as shown in FIG. In the bonded state, the other end 22c of the first link member 22 is movable in the direction of arrow A.

The second support portion 29 formed on the resin sheet 25 is provided with two strip-shaped members (cutout portions) 29 a formed by cutting out a part of the resin sheet 25. The strip-shaped member 29a is provided corresponding to the two other end portions 23c of the second link member 23, and the other end portions 23c are fixed to each other.

  FIG. 4 shows a state in which the other end portion of the second link member 23 is fixed. In FIG. 4, notches 29b are formed on three sides of the strip-shaped member 29a, and the strip-shaped member 29a can be bent in the plate thickness direction. The strip-shaped member 29a and the other end portion 23c of the second link member 23 are bonded so as to be overlapped by an adhesive 31 as shown in FIG. The other end 23c of the second link member 23 after bonding can be bent in the arrow direction, that is, in the thickness direction of the resin sheet 25, as shown in FIG. Moreover, the contact hole 25a shown in FIG. 1 is located in the upper part of the contact part of the membrane sheet 26, and is the magnitude | size into which the rubber dome 24 enters.

  As shown in FIG. 2, the membrane sheet 26 includes two flexible sheets 26a and 26b and a spacer sheet 26c sandwiched between the two flexible sheets 26a and 26b. Is provided with a plurality of through holes 26f corresponding to a plurality of keys. The through-hole 26f forms a space between the two flexible sheets 26a and 26b, and a fixed contact 26d is provided on the flexible sheet 26b on the back plate 27 side so as to be opposed to each other in this space. The movable contact 26e is provided on the flexible sheet 26a on the rubber dome 24 side. The fixed contact 26d and the movable contact 26e constitute a contact portion 26g. Further, the back plate 27 is disposed at the lower part so as to mount the above-described components.

  Next, the operation of the first embodiment will be described. FIG. 2 shows a state where the key top 21 is not pressed. In this state, the resin sheet 25, the first and second link members 22, 23, and the rubber dome 24 are disposed between the membrane sheet 26 and the key top 21, and an element that determines the height therebetween. These are the thickness of the resin sheet 25 and the heights of the first and second link members 22 and 23. The resin sheet 25 is formed of a thin resin, and the first and second link members 22 and 23 are formed of flat members, so that the height between the membrane sheet 26 and the key top 21 is lowered. Therefore, the key switch 20 can be thinned.

In the state shown in FIG. 2, when the key top 21 is pressed from above with an arbitrary load, for example, when the key top 21 is pressed at the position of the right end indicated by the arrow in FIG. Move to. As a result, the one end portion 22a of the first link member 22 descends, and the first link member 22 rotates in the clockwise direction in FIG. 2 around the central portion connected to the second link member 23. At this time, since the locking portion 21ba of the support portion 21b of the key top 21 is loosely fitted in the hole 22b formed in the one end portion 22a of the first link member 22, the first link member 22 is rotatable. The other end portion 22c of the first link member 22 moves in the direction of arrow A shown in FIG. 3B together with the strip-shaped member 28a of the first support portion 28. The strip-shaped member 28a presses the elastic portion 28c by this movement.

As the first link member 22 rotates, the second link member 23 connected to the first link member 22 at the central portion rotates in the counterclockwise direction in FIG. 2 around the central portion which is the connecting portion. Then, the one end portion 23a is lowered. Here, since the other end 23c of the second link member 23 is fixed to the strip-shaped member 29a of the flexible second support portion 29, the second link member 23 rotates well. By the lowering of the one end portion 23a, the opposite side of the key top 21 engaged with the one end portion 23a of the second link member 23 (on the left side in the figure, opposite to the pressing position) is also pulled by the second link member 23. And descend. Thus, even if the end of the key top 21 is pressed, the key top 21 is lowered while maintaining the horizontal state.

As the key top 21 is lowered, the rubber dome 24 is bent, and the contact pressing portion 24a of the rubber dome 24 presses the contact portion 26g of the membrane sheet 26 as shown in FIG. As a result, the movable contact 26e comes into contact with the fixed contact 26d and the switch is closed. FIG. 5 is a sectional view showing a state where the key top is pressed.

When the pressing on the key top 21 is released, the key top 21 is pushed upward by the restoring force of the rubber dome 24 and returns to the state before the pressing. At this time, the other end portion 22 c of the first link member 22 is pushed back by the restoring force of the elastic portion 28 c of the first support portion 28 formed on the resin sheet 25, and this force also becomes a force for pushing up the key top 21.

  As described above, according to the first embodiment, the first link member 22 and the second link member 23 formed of a flat plate member constitute a link mechanism, and the first link member 22 is formed integrally with the resin sheet 25. Since the second link member 23 is fixed to the strip-shaped member 28a of the first support portion 28 and supported by the second support portion 29 formed integrally with the resin sheet 25, the key switch 20 can be made thinner. In addition, it is possible to provide a key switch with good operability in which the key top 21 descends while maintaining the horizontal state even when the end of the key top 21 is pressed.

Next, Example 2 will be described. FIG. 6 is a perspective view illustrating the first link member of the second embodiment. In FIG. 6, the first link member 31 of the second embodiment is made of a flat plate-like member as in the first embodiment, and is formed in a substantially U shape. A hole 31b into which a locking portion 21ba formed in the key top 21 is inserted is formed in one end portion 31a of the first link member 31, and the other end portion 31c of the first link member 31 is a resin sheet 33 described later. This part is also formed in a flat plate shape. The first link member 31 is formed in a flat plate shape, which contributes to thinning of the key switch structure.

A hole 31 f is formed in the other end portion 31 c of the first link member 31. A cut-and-raised portion 34a of a first support portion 34 formed in a resin sheet 33 described later is fitted into the hole 31f. A step portion 31d is formed at the center of the first link member 31, and a notch portion 31e is formed inside the step portion 31d. The notch 31 e is provided for connection with the second link member 32.

FIG. 7 is a perspective view illustrating a second link member of the second embodiment. In FIG. 7, the second link member 32 of the second embodiment is made of a flat plate-like member as in the first embodiment, and is formed in a substantially U shape as a whole. A hole 32 b into which the support portion 21 a formed on the key top 21 is inserted is formed in one end portion 32 a of the second link member 32, and the other end portion 32 c of the second link member 32 is fixed to the resin sheet 33. This part is also formed in a flat plate shape. The second link member 32 is formed in a flat plate shape, thereby contributing to a reduction in the thickness of the key switch structure.

A hole 32 f is formed in the other end portion 32 c of the second link member 32. A cut-and-raised portion 35a of a second support portion 35 formed integrally with a resin sheet 33 described later is fitted into the hole 32f. A step portion 32d is formed at the center of the second link member 32, and a notch 32e is formed outside the step portion 32d. The notch 32 e is provided for connection with the first link member 31.

FIG. 8 is a perspective view showing a resin sheet of Example 2. FIG. In FIG. 8, the resin sheet 33 is provided in the upper part of the whole membrane sheet | seat 26, and the 1st support part 34, the 2nd support part 35, and the contact hole 33a are provided for every key switch. The first support portion 34 is provided with a strip-shaped member (cut-out portion) 34b formed by cutting out a part of the resin sheet 33, the strip-shaped member 34b is provided with an elastic portion 34c, and further its tip The part is formed with a cut-and-raised part 34a protruding in the vertical direction. The strip-shaped member 34b is provided corresponding to the two other end portions 31c of the first link member 31, and the other end portions 31c are fixed to each other.

  Further, the second support portion 35 is provided with a strip-shaped member (cut-out portion) 35b formed by cutting out a part of the resin sheet 33, and a cut-out protruding in the vertical direction at the tip portion of the strip-shaped member 35b. A raised portion 35a is formed. The strip-shaped member 35b is provided corresponding to the two other end portions 32c of the second link member 32, and the other end portions 32c are fixed to each other.

FIG. 9 is a perspective view illustrating a first support portion according to the second embodiment. In FIG. 9, an elastic portion 34 c is formed on the strip-shaped member 34 b of the first support portion 34, and the strip-shaped member 34 b can be expanded and contracted in the arrow A direction. As shown in FIG. 9A, the strip-shaped member 34b and the other end portion 31c of the first link member 31 are fixed by fitting and raising the cut-out portion 34a into the hole 31f of the other end portion 31c. After the insertion, as shown in FIG. 9B, the tip of the cut and raised portion 34a is bent and fixed. After fixing, the other end 31c of the first link member 31 is movable in the direction of arrow A, that is, in the surface direction of the resin sheet 33.

FIG. 10 is a perspective view illustrating a second support portion of the second embodiment. In FIG. 10, a notch 35c is formed on three sides of the strip-shaped member 35b of the second support portion 35, and the strip-shaped member 35b can be bent in the plate thickness direction. As shown in FIG. 10A, the strip-shaped member 35b and the other end portion 32c of the second link member 32 are fixed by inserting and raising the raised portion 35a into the hole 32f of the other end portion 32c. That is, after the insertion, as shown in FIG. 10B, the tip of the cut and raised portion 35a is bent and fixed. After fixing, the other end 32c of the second link member 32 can be bent in the direction of the arrow, that is, in the thickness direction of the resin sheet 32. Other configurations are the same as those of the first embodiment.

  The operation of the key switch of the second embodiment is the same as that of the first embodiment. Also in the second embodiment, it is possible to reduce the thickness of the key switch, and to provide a key switch with good operability in which the key top 21 is lowered while maintaining the horizontal state even when the end of the key top 21 is pressed. Is possible.

Next, Example 3 will be described. FIG. 11 is a perspective view illustrating the first link member of the third embodiment. In FIG. 11, the 1st link member 41 of Example 3 consists of a flat member as the whole like Example 1, and the whole is formed in the substantially U shape. One end 41 a of the first link member 41 is formed with a hole 41 b into which the locking portion 21 ba formed in the key top 21 is inserted, and the other end 41 c of the first link member 41 is fixed to the resin sheet 43. This part is also formed in a flat plate shape. The first link member 41 is formed in a flat plate shape, thereby contributing to a reduction in the thickness of the key switch structure.

A round hole 41 f is formed in the other end portion 41 c of the first link member 41. In the round hole 41f, a launch portion 44a of the first support portion 44 formed integrally with a resin sheet 43 described later is fitted. A step portion 41d is formed at the center of the first link member 41, and a notch portion 41e is formed outside the step portion 41d. The notch 41e is provided for connection to the second link member 42.

FIG. 12 is a perspective view illustrating a second link member of the third embodiment. In FIG. 12, the 2nd link member 42 of Example 3 consists of a flat member as the whole like Example 1, and the whole is formed in the substantially U shape. A hole 42 b into which the support portion 21 a formed on the key top 21 is inserted is formed in one end portion 42 a of the second link member 42, and the other end portion 42 c of the second link member 42 is fixed to the resin sheet 43. This part is also formed in a flat plate shape. The second link member 42 is formed in a flat plate shape, thereby contributing to a reduction in the thickness of the key switch structure.

A round hole 42 f is formed in the other end portion 42 c of the second link member 42. A projecting portion 45a of a second support portion 45 formed integrally with a resin sheet 43 described later is fitted into the round hole 42f. A step part 42d is formed at the center of the second link member 42, and a notch part 42e is formed outside the step part 42d. The cutout portion 42 e is provided for connection to the first link member 41.

FIG. 13 is a perspective view showing a resin sheet of Example 3. FIG. In FIG. 13, the resin sheet 43 is provided in the upper part of the whole membrane sheet | seat 26, and the 1st support part 44, the 2nd support part 45, and the contact hole 43a are provided for every key switch. The first support portion 44 is provided with a strip-shaped member (cut-out portion) 44b formed by cutting out a part of the resin sheet 43, and an elastic portion 44c is formed on the strip-shaped member 44b. A launch portion 44a is formed. The strip-shaped member 44b is provided corresponding to the two other end portions 41c of the first link member 41, and the other end portions 41c are fixed to each other.

The second support portion 45 is provided with a strip-shaped member (cut-out portion) 45b formed by cutting out a part of the resin sheet 43, and a stamped portion 45a is formed above the strip-shaped member 45b. The strip-shaped member 45b is provided corresponding to the two other end portions 42c of the second link member 42, and the other end portions 42c are fixed to each other.

  FIG. 14 is a perspective view illustrating a first support portion according to the third embodiment. In FIG. 14, an elastic portion 44 c is formed on the strip-shaped member 44 b of the first support portion 44, and the strip-shaped member 44 b can be expanded and contracted in the arrow A direction. As shown in FIG. 14A, the strip-shaped member 44b and the other end portion 41c of the first link member 41 are fixed by fitting the cut-and-raised portion 44a into the round hole 41f of the other end portion 41c. After the insertion, as shown in FIG. 14B, the tip end portion of the cut and raised portion 44a is crushed and fixed. After fixing, the other end 41c of the first link member 41 is movable in the direction of arrow A, that is, in the surface direction of the resin sheet 43.

FIG. 15 is a perspective view illustrating a second support portion according to the third embodiment. In FIG. 15, notches 45c are formed on three sides of the strip-shaped member 45b, and the strip-shaped member 45b can be bent in the plate thickness direction. As shown in FIG. 15A, the strip-like member 45b and the other end portion 42c of the second link member 42 are fixed by inserting the projecting portion 45a into the round hole 42f of the other end portion 42c. After the insertion, as shown in FIG. 15 (b), the tip of the launching portion 45a is crushed and fixed. After fixing, the other end portion 42c of the second link member 42 can be bent in the arrow direction, that is, in the plate thickness direction of the resin sheet 42. Other configurations are the same as those of the first embodiment.

  The operation of the key switch of the third embodiment is the same as that of the first embodiment. Also in the third embodiment, it is possible to reduce the thickness of the key switch, and to provide a key switch with good operability in which the key top 21 is lowered while maintaining the horizontal state even when the end of the key top 21 is pressed. Is possible.

  The present invention is not limited to the above embodiments, and various modifications can be made. For example, as the resin sheet described in each of the above embodiments, a material having high elasticity is used, the strip member is cut and raised at an arbitrary angle, and the second link member fixed to the strip member is raised, that is, the key top. You may make it give the force which returns to the original position from the state pressed. Moreover, you may use the metal which has a spring property instead of a resin sheet.

It is a disassembled perspective view which shows the key switch structure of Example 1 of an embodiment. It is sectional drawing which shows the key switch structure of Example 1 of an embodiment. FIG. 3 is a perspective view showing a first support part of Example 1. FIG. 6 is a perspective view showing a second support part of Example 1. It is sectional drawing which shows the state by which the keytop in Example 1 was pressed down. It is a perspective view which shows the 1st link member of Example 2. FIG. It is a perspective view which shows the 2nd link member of Example 2. FIG. It is a perspective view which shows the resin sheet of Example 2. FIG. FIG. 6 is a perspective view showing a first support part of Example 2. FIG. 6 is a perspective view showing a second support part of Example 2. 10 is a perspective view showing a first link member of Example 3. FIG. It is a perspective view which shows the 2nd link member of Example 3. FIG. It is a perspective view which shows the resin sheet of Example 3. FIG. 6 is a perspective view showing a first support part of Example 3. FIG. 6 is a perspective view showing a second support part of Example 3. It is sectional drawing which shows the conventional key switch structure.

Explanation of symbols

20 Key switch 21 Key tops 22, 31, 41 First link members 23, 32, 42 Second link members 25, 33, 43 Resin sheets 28, 34, 44 First support portions 29, 35, 45 Second support Portions 28a, 34d, 44d, 29a, 35d, 45d Strip members 28c, 34c, 44c Elastic portions

Claims (9)

A key top, a membrane sheet having a contact portion, and a first link member and a second link member that are disposed between the key top and the membrane sheet and support the key top so as to be movable up and down. In a key switch structure with a link mechanism that
A sheet-like member is disposed on the membrane sheet,
The first link member is formed in a flat plate shape as a whole, a first hole is formed in one end of the flat plate member of the first link member, and a first hole is formed in the back surface of the key top. When the first support portion is inserted, the one end portion of the first link member is rotatably supported,
The second link member is formed in a flat plate shape as a whole, a second hole is formed at one end of the flat plate member of the second link member, and the second hole is formed on the back surface of the key top. When the second support portion is inserted, the one end portion of the second link member is movably supported,
It said sheet-like member, movable in the plane direction of the sheet-like member, the first link member by the other end portion formed in a plate shape of said first link member is fixed is overlapped a third support portion for supporting the other end portion formed in a plate-like second link member is fixed, and a fourth support section for supporting the second link member pivotally provided Key switch structure characterized by that. Said third support section, the part of the sheet-like member is a cutting unit which is cut out so as to have an elastic portion, the other end of said first link member is fixed to該切out portion The key switch structure according to claim 1. Wherein said another end portion and the cutting portion of the first link member is a key switch structure of claim 2, wherein the fixed by being bonded. The cutting unit cut-raised portion is formed on the other end portion of the first link member by inserting The sections Ri raised portion into the hole portion formed in the other end portion of the first link member The key switch structure according to claim 2, wherein the cut-out portion is fixed. The protruding portion is formed in the cutting unit, the projecting portion inserted into the hole portion formed in the other end portion of the first link member, the first link by further deforming the projecting portion the key switch structure of claim 2, wherein the cutting unit and the other end is fixed in the member. Said fourth support portion is a cutting portion which is partially cut in the sheet-like member is deflectable in its own thickness direction, the other end of said second link member is out該切The key switch structure according to claim 1 or 2, wherein the key switch structure is fixed to the portion. The cutting unit cut-raised portion is formed on the other end portion of the second link member by inserting The sections Ri raised portion into the hole portion formed in the other end portion of the second link member The key switch structure according to claim 6, wherein the cut-out portion is fixed. The sheet-like member is formed of a highly elastic member, and the fourth support portion is a cut-and-raised portion in which a part of the sheet-like member is cut and raised at an arbitrary angle, and the second link member the key switch structure of claim 6, wherein the other end is fixed to the raised portion Ri該切. The protruding portion is formed in the cutting unit, the projecting portion inserted into the hole portion formed in the other end portion of the second link member, said second link by further deforming the projecting portion the key switch structure of claim 6, wherein the cutting unit and the other end is fixed in the member.

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