JPH11212571A - Driving part structure for keyed device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving part structure for keyed device which is stabilized in driving and driven operations to improve the speed of operation transmission. SOLUTION: A key 1 is so constituted that it can be turned around a key turning shaft P1 to drive a hammer 2, and the hammer 2 is so constituted that it can be turned around a hammer turning shaft P2 to drive a switch part 3, and the switch part 3 is so constituted that its swelling part 3a is turned in the vertical direction by a hinge part 3c. A slide face 2d of the hammer 2 is formed into a plane, and the hammer turning shaft P2 exists in a face including the slide face 2d. The slide face of the swelling part 3a of a face 3a1 is formed to a plane, and the hinge part 3x exists in a face including the slide face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive unit structure for a keyboard device comprising a driving body and a driven body.

[0002]

2. Description of the Related Art Conventionally, a keyboard device is provided with various driving units including a driving body (actuator) and a driven body driven by the actuator. For example, a key and a mass body for giving inertia to the key pressing operation are provided, and a key switch unit driven by the mass body and capable of detecting the key pressing operation is provided, and the key pressing operation causes the mass body to rotate. In addition, a drive unit structure of a keyboard device in which the key switch unit is driven through rotation of the mass body is generally known.

In this case, if the key and the mass body are regarded as one drive unit, the key is an actuator, the mass body is a driven body, and if the mass body and the key switch unit are regarded as one drive unit. , The mass body is an actuator, and the key switch unit is a driven body.

[0004] These drive units are generally configured such that the actuator and the driven body (or only the driven body) rotate about respective rotation axes (rotation fulcrums). A part is brought into contact with the driven body so that the driven body can be rotated. Moreover, at least one of the actuator and the driven body is generally formed in a planar shape at a portion in contact with the other. For example, the distal end of the actuator is formed into a curved surface, the driven body is formed with a planar abutting surface, and the actuator is driven by the distal end abutting on the abutting surface of the driven body. That can be driven.

[0005]

However, in the above-described conventional driving device structure of the keyboard device, the influence of friction between the actuator and the driven body during driving is not sufficiently considered, so that the driving operation cannot be stabilized. There was room for improvement.

That is, in the drive unit structure of the conventional keyboard device, since the positions of the rotation axes of the actuator and the driven body do not usually coincide with each other, the driven unit is driven by the rotation of the actuator unless a particularly complicated structure is adopted. In order to rotate the body, relative sliding between the two is inevitable. In other words, the actuator drives the driven body while abutting and sliding on the driven body, whereby a frictional force is generated between the two.

FIG. 10 is a diagram showing an example of the configuration of a drive unit structure of the above-mentioned conventional keyboard device. In this example, the actuator 101 is, for example, a part of a key, has a protrusion 101a having a convex curved cross section at the tip end, and is movable vertically. The driven body 102 is, for example, a mass body or a switch body, has a planar sliding contact surface 102a,
About the center.

The actuator 101 has a projection 101a.
Drives the driven body 102 by sliding in contact with the sliding contact surface 102 a of the driven body 102. At that time, the actuator 101
Descends almost straight down, a frictional force F is generated by sliding (in the left-right direction on the paper surface) between the protrusion 101a and the sliding contact surface 102a. Since this frictional force F is a force in the sliding direction of the sliding contact surface 102a, a rotational moment M around the rotation shaft 103 is represented by M = F × L. Where L
Is the shortest distance from the rotation shaft 103 to the surface including the sliding contact surface 102a, and in this example, varies depending on the driving stroke.
In this example, during driving, the frictional force F is
1 and the driven body 102, and the rotational moment M acts on the driven body 102. When the actuator 101 has a rotation axis, the actuator 101 also receives a certain rotational moment.

However, when the driven body is a mass body having a large inertia or a switch body whose operation state is directly related to the key pressing accuracy, the frictional force between the actuator and the driven body cannot be ignored. In particular, when the actuator and the driven body are both rotating bodies, the frictional force acts as the rotational moment of the actuator and the driven body, respectively. When the frictional force is large, the influence on the operation of the driving unit is large.

In addition, at an important timing involving an accelerating operation, such as in the initial stage of key depression or in the initial stage of key recovery starting from the lower limit position of the key in the key depression stroke (the so-called key stroke opening position), the drive unit is particularly required. Smooth and agile movement is required. In addition, when the key switch unit comes into contact with the substrate, a delicate driving operation as intended for accurate key press detection is required. Therefore, the fact that the frictional force itself is large also has an adverse effect on the operation of the drive unit.

As described above, in the drive unit structure of the conventional keyboard device, the driving and driven operations of the drive unit become unstable due to the frictional force generated between the actuator and the driven body, and the operation of the actuator is affected. There is a problem that the power is not accurately transmitted to the driving body. For example, if the drive unit is related to a key-pressing operation, the key-pressing resistance may be increased, resulting in deterioration of the touch feeling and deterioration of the key-press detection accuracy in some cases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a driving apparatus for a keyboard device capable of stabilizing driving and driven operations and improving the transmission accuracy of the operations. It is to provide a partial structure.

[0013]

According to a first aspect of the present invention, there is provided a driving device for a keyboard device which has a flat sliding contact surface and is rotatable about a rotation fulcrum. A driving body, and an actuator capable of rotating the driven body by sliding against a sliding contact surface of the driven body, wherein a rotation fulcrum of the driven body is formed in a planar shape of the driven body. It is characterized in that it exists in a plane including the sliding contact surface.

With this configuration, the actuator comes into contact with the sliding surface of the driven body and slides, and the driven body is driven to rotate about its rotation fulcrum. The sliding contact surface of the driven body is planar, and the rotation fulcrum is in a plane including the sliding contact surface. Therefore, the rotational force about the rotation fulcrum does not occur due to the frictional force generated by the sliding contact between the driven body and the actuator, and the resistance force as the rotational moment to the rotation of the driven body is not generated. It does not work. Therefore, the driving and driven operations can be stabilized, and the transmission accuracy of the operations can be improved. For example, if the present invention is applied to a key driving unit, the touch feeling of the key can be improved by reducing the key pressing resistance.

Preferably, the driven body is one of a mass body for giving inertia to a key pressing operation and a switch body having a key switch for detecting a key pressing operation. ).

With this configuration, when the driven body is a mass body, the touch feeling can be improved, and when the driven body is a switch body, the key pressing accuracy and the touch feeling can be improved. Can be.

[0017] To achieve the same object, claim 3 of the present invention.
The drive unit structure of the keyboard device has a planar sliding contact surface.
A driven body that is rotatable about a rotation fulcrum, and a driven body that is rotatable about a second rotation fulcrum and slides in contact with a sliding contact surface of the driven body. A drivable actuator, wherein a surface including a sliding contact surface of the driven body passes through the second rotation fulcrum during a rotation driving process by the actuator.

According to this configuration, the actuator rotates about the first rotation fulcrum and slides on the sliding contact surface of the driven body to rotate the driven body about the second rotation fulcrum. Dynamically driven. In the rotation drive process by the actuator, a surface including the sliding contact surface of the driven body passes through the second rotation fulcrum. When a surface including the sliding contact surface of the driven body passes through the second rotation fulcrum, the second rotation fulcrum may be moved depending on the frictional force generated by the sliding contact between the actuator and the driven body. No rotational moment is generated, and the resistance given to the rotation of the actuator by the driving operation is minimized. Therefore, the driving and driven operations can be stabilized, and the transmission accuracy of the operations can be improved. For example, if the present invention is applied to a key driving unit, the touch feeling of the key can be improved by reducing the key pressing resistance.

Preferably, the key comprises a key and a switch board, and the actuator is configured to rotate by a key-pressing operation, and wherein the driven body contacts the switch board to detect the key-pressing action. A switch is provided, and a surface including a sliding contact surface of the driven body passes through the second rotation fulcrum when the key switch comes into contact with the switch board (claim 4).

With this configuration, the resistance applied to the rotation of the actuator when the key switch contacts the switch board is minimized. Therefore, it is possible to stabilize the driving and driven operations of the key switch, which is the most important for detecting the key pressing operation, when the key switch comes into contact with the switch board, and improve the detection accuracy of the key pressing operation.

Alternatively, a key may be provided and the actuator may be rotated by a key-pressing operation. When the key arrives at a lower limit position in a key-pressing stroke, the actuator may be driven in a plane including a sliding contact surface of the driven body. The second rotation fulcrum may be located (claim 5).

With this configuration, the resistance applied to the rotation of the actuator when the key reaches the lower limit position in the key pressing stroke is minimized. Therefore, the touch feeling can be improved by stabilizing the driving and driven operations when the key reaches the lower limit position in the key pressing stroke that most affects the feeling of after touch.

[0023] To achieve the same object, claim 6 of the present invention.
The drive unit structure of the keyboard device includes a driven body that has a sliding contact surface and is rotatable about a first rotation fulcrum, and a driven body that is rotatable about a second rotation fulcrum and about the second rotation fulcrum. An actuator capable of rotationally driving the driven body by abuttingly sliding on the sliding contact surface, wherein a contact point at which the actuator and the driven body come into contact with each other during the rotation driving process by the actuator is the first contact point; Characterized by passing through a line connecting the rotation fulcrum and the second rotation fulcrum.

With this configuration, the driven body having the sliding contact surface rotates around the first rotation fulcrum. The actuator is rotated about the second rotation fulcrum to abut on the sliding surface of the driven body to slide and drive the driven body. Then, in the rotation drive process by the actuator, the contact point where the actuator and the driven body contact each other passes through a line connecting the first rotation fulcrum and the second rotation fulcrum.

Thus, when the contact point where the actuator and the driven body contact each other passes through the line connecting the first rotation fulcrum and the second rotation fulcrum, the first and second rotation fulcrum and the contact point Are substantially in the same plane, the amount by which the actuator slides relative to the driven body is minimized. Therefore, the amount by which the actuator slides on the driven body can be reduced, and the resistance to driving and driven operations can be reduced by reducing friction. Therefore, the driving and driven operations can be stabilized, and the transmission accuracy of the operations can be improved. For example, if the present invention is applied to a key driving unit, the touch feeling of the key can be improved by reducing the key pressing resistance. Further, the durability of the driving section itself can be improved.

Preferably, the key switch includes a key and a switch board, and the actuator is configured to rotate by a key-pressing operation, and the driven body contacts the switch board to detect a key-pressing operation. And a contact point where the actuator and the driven body come into contact with each other when the key switch comes into contact with the switch board is present on a line connecting the first rotation fulcrum and the second rotation fulcrum. (Claim 7).

According to this configuration, the amount of sliding of the actuator against the driven body when the key switch most important for detecting the key pressing operation comes into contact with the switch board can be minimized, and the driving and driven operations can be performed. And the detection accuracy of the key pressing operation can be improved.

Alternatively, a contact is provided with a key, wherein the actuator is rotated by a key pressing operation, and the actuator and the driven body come into contact with each other when the key reaches a lower limit position in a key pressing stroke. May exist on a line connecting the first rotation fulcrum and the second rotation fulcrum (claim 8).

According to this configuration, the amount of sliding of the actuator with the driven body when the key reaches the lower limit position in the key stroke that most affects the feel of aftertouch can be minimized, and the drive and the driven Can be stabilized to improve the touch feeling.

Preferably, in the configuration according to any one of claims 6 to 8, a trajectory of a contact point at which the actuator contacts the driven body is defined by the first rotation fulcrum and the second fulcrum. It is characterized in that it is configured to intersect with a line segment connecting the rotation fulcrum (claim 9).

With this configuration, the trajectory of the contact point where the actuator and the driven body come into contact with each other, the first rotation fulcrum and the second rotation fulcrum.
An intersection with a line segment connecting the rotation fulcrums exists between the first rotation fulcrum and the second rotation fulcrum. Considering the movement of the contact point on the sliding contact surface of the driven body, a contact point where the actuator contacts the driven body is a line segment connecting the first rotation fulcrum and the second rotation fulcrum. When the driven body is rotating in a direction approaching the above, the actuator slides in the direction of the first rotation fulcrum. on the other hand,
A contact portion of the actuator (for example, when the cross-sectional shape is a convex curved surface) rotates in a direction rolling with respect to the sliding contact surface of the driven body toward the center of the first rotation fulcrum. This rolling action acts in a direction that reduces the amount by which the actuator slides on the driven body. Therefore, the amount by which the actuator slides with the driven body is reduced. Therefore, the sliding amount can be reduced at the beginning of the forward operation of driving and driven as compared with the end thereof, and as a result, the frictional force can be reduced. Therefore, for example, keying resistance can be reduced at an important operation timing accompanied by a large number of acceleration operations at the beginning of the keying operation, and the touch feeling of the key can be improved.

In the first to ninth aspects, the sliding relationship may be opposite between driving and driven.

[0033]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the structure of a drive unit structure of a keyboard device according to one embodiment of the present invention. This drive unit structure includes a key 1 (white key), a hammer 2 (mass body) for giving an appropriate inertia to a key pressing operation to obtain a key pressing feeling like an acoustic piano, and a key pressing operation for detecting a key pressing operation. It is mainly composed of a drive section comprising a switch section 3 (switch body) and a support member 9 and a chassis 4 supporting the entire drive section. The black key is configured similarly to the key 1, and is rotatably supported by the chassis 4.

As will be described later in detail, a key 1, a hammer 2,
The switch unit 3 has respective pivot axes, that is, a key pivot axis P1, a hammer pivot axis P2 (second pivot point), and a switch pivot axis P3 (first pivot point) (see also FIG. 2). It is configured to be rotatable vertically as a center. The key 1 is configured to drive a hammer 2, and the hammer 2 is configured to drive a switch unit 3.

When the key 1 is rotated by the key pressing operation, the hammer 2
And the switch part 3 rotates. At that time, key 1 and hammer 2
In this relation, it can be said that the key 1 is an actuator (drive body) and the hammer 2 is a driven body, and the relationship between the hammer 2 and the switch unit 3 is that the hammer 2 is an actuator and the switch unit 3 is a driven body.

FIGS. 2 and 3 are side sectional views taken along the line II-II of FIG. FIG. 2 shows a non-key-pressed state (a state where the key 1 is at the upper limit position of the key-pressing process), and FIG. 3 shows a key-pressed state (a state where the key 1 is at the lower limit position of the key-pressing process).

The key 1 is provided with a convex fulcrum key fulcrum 1a at the rear end face. On the other hand, a key support portion 5 is provided at a rear portion of the chassis horizontal portion 4a of the chassis 4. A concave portion 5a is provided in a portion of the key support portion 5 facing the key fulcrum portion 1a so as to correspond to each key fulcrum portion 1a (FIG. 1).
The key fulcrum portion 1a engages with the concave portion 5a of the key support portion 5, and the key 1
Is rotatable up and down around the key fulcrum 1a (key rotation axis P1).

At the front of the key 1, there is provided a hammer driving portion 1b which hangs downward. A buffer 13 made of urethane rubber or the like is attached to the lower end of the hammer driving section 1b. The cushioning material 13 is sandwiched between the upper extending portion 2c and the lower extending portion 2b of the hammer 2, and transmits the key pressing operation of the key 1 to the hammer 2 and the return operation of the hammer 2 to the key 1. I do. Here, since the position of the key rotation axis P1 which is the rotation center of the key 1 and the position of the hammer rotation axis P2 which is the rotation center of the hammer 2 do not match, the sliding contact between the cushioning material 13 and the hammer 2 is performed. Face 2
The contact with d always involves relative sliding. Therefore, with the key being pressed, the lower end of the cushioning material 13 is
The key 1 is returned by the opposite operation when the key is pressed, while the hammer 2 is rotated downward by sliding in contact with the sliding contact surface 2d. In the key-pressing and key-returning processes, the upper end of the cushioning material 13 is always in contact with the upper extension 2c of the hammer 2 to ensure the transmission of the operation.

The chassis 4 is reinforced by connecting a chassis horizontal portion 4a and a front portion 4b of the chassis 4 by ribs 12. A key guide 6 for restricting the rotation of the keys 1 in the direction in which the keys 1 are arranged is provided on the front portion 4b of the chassis so as to project from each key 1. A chassis holding portion 4c is provided below the rear portion of the chassis 4.
Is provided. The chassis holding portion 4c is
And also functions as a stopper for the hammer 2 so that the hammer 2 does not fall off after the hammer 2 is attached to the chassis 4.

The hammers 2 are provided corresponding to the respective keys 1.
Hammer support portion 9a of support member 9 provided on chassis 4
Is used as a rotation axis (hammer rotation axis P2; rotation fulcrum) and is supported by the hammer fulcrum part 2a so as to be freely rotatable in the vertical direction.
A fork-shaped spring 7 is suspended from the vicinity of the hammer fulcrum 2a to the rear of the key 1. The spring 7 presses the key 1 against the key support 5 and presses the hammer 2 against the hammer support 9 a of the support member 9, and the key 1 and the hammer 2
Are not easily dropped from the chassis 4.

The hammer 2 always urges the key 1 upward at the lower extension 2b due to the weight of the mass member 2f. As described above, the restoring force of the key 1 is not provided by the spring 7 but is due to the restoring force of the hammer 2.
FIG. 4 is a partial sectional view of the hammer 2. The sliding surface 2d of the hammer 2 is formed in a planar shape, and includes a surface SF1 including the sliding surface 2d.
Is set so that the hammer rotation axis P2 exists in the inside. With such a setting, the surface S is moved from the hammer rotation axis P2.
The shortest distance to F1 is 0. Therefore, frictional force is generated by sliding between the cushioning material 13 provided on the key 1 and the sliding contact surface 2d of the hammer 2 at the time of key pressing operation, but theoretically, the hammer 2 on the side where the frictional force is driven is generated. Is prevented from acting as a rotational moment.

The hammer 2 has a switch driving section 2e at a lower portion. The switch driving section 2e has a distal end portion formed in a substantially convex curved section, and functions as an actuator for pressing the switch section 3 when a key is pressed.

Returning to FIGS. 2 and 3, an upper stopper 10 and a lower stopper 1 made of felt or the like are provided on the rear portion of the chassis horizontal portion 4a and the chassis holding portion 4c of the chassis 4, respectively.
1 is provided. The upper stopper 10 contacts the mass member 2f of the hammer 2 when the key is pressed, and regulates the lower limit position of the key 1. The lower stopper 11 contacts the mass member 2f of the hammer 2 when the key is not pressed, and the upper limit position of the key 1. Regulate.

A switch board 8 is provided on the front part 4b of the chassis 4.
Is mounted, and the switch section 3 is provided on the switch board 8. The switch section 3 is provided for each hammer 2 so as to face the switch drive section 2e of the hammer 2.

FIG. 5 is a sectional view taken along the line V--V of FIG. 1 showing a detailed configuration of the switch section 3. As shown in FIG.

The switch unit 3 is a contact time difference type two-make type touch response switch, and includes a fixed unit FS and a movable unit MS. The fixed part FS is a switch board 8
Fixed contact F1, which is a comb-like pattern provided on the upper surface of
F2. The movable part MS includes an elastic swelling part 3a, a base 3b, and a hinge part 3c. The bulging portion 3a has a first,
The movable contacts 3a2 and 3a3 for the second makeup are fixed contacts F
1 and F2.

The bulging portion 3a is vertically rotatable around a hinge portion 3c (switch rotation axis P3; rotation fulcrum) by its elasticity. Here, hammer rotation axis P
The position of 2 and the switch rotation axis P3 do not match. Therefore, when the hammer 2 rotates in response to a key-pressing operation, the switch driving unit 2
e slides on the sliding contact surface 3a1 of the switch portion 3 to rotate the bulging portion 3a. That is, the contact between the switch drive unit 2e and the sliding contact surface 3a1 always involves relative sliding. When the bulging portion 3a rotates downward, first, the movable contact 3a2 comes into contact with the fixed contact F1, and then the movable contact 3a3 comes into contact with the fixed contact F.
2, key-on and key velocity of key 1 are detected.

The sliding surface 3a1 of the bulging portion 3a is formed in a flat shape, and the hinge portion 3c exists in a surface SF2 including the sliding surface 3a1. With such a setting, similarly to the case of the hammer 2, the surface SF is moved from the switch rotation axis P3.
The shortest distance to 2 is 0. Therefore, when the key is pressed, the switch driving section 2e of the hammer 2 and the sliding contact surface 3 of the switch section 3 are pressed.
Although frictional force is generated by sliding with a1, theoretically,
This prevents the frictional force from acting on the driven switch unit 3 as a rotational moment.

FIG. 6 shows the state when the contacts are in contact (movable contacts 3a2, 3a).
It is a schematic diagram showing hammer 2 and switch part 3 at the time of a3 contacting fixed contacts F1 and F2).

When the switch section 3 is depressed by the switch driving section 2e of the hammer 2, the bulging section 3 as shown in FIG.
a is collapsed, the movable contacts 3a2, 3a3 are fixed contacts F1,
Contact 2 At the time of this contact, the position of the sliding contact surface 3a1 has changed from that at the time of non-key depression. That is, in the present embodiment, the switch unit 3
The surface SF2 including the sliding contact surface 3a1 passes through the hammer rotation axis P2. In particular, the hammer rotation axis P
2 are set to exist.

As described above, the sliding contact (at the contact point Q) between the switch driving section 2e of the hammer 2 and the sliding contact surface 3a1 of the switch section 3 generates a frictional force between the two. Also works. However, by setting the positions of the sliding contact surface 3a1 and the hammer rotation axis P2 as described above, the rotational moment acting on the hammer 2 which is driven by the frictional force is minimized when the contact is in contact.

FIG. 7 is a schematic diagram showing a locus of a point (contact point Q) where the hammer 2 and the switch section 3 come into contact with each other in the rotation driving process of the hammer 2. In this drive unit structure, the hammer 2
The contact Q passes through the surface SF3 including the hammer rotation axis P2 and the switch rotation axis P3 (that is, the locus of the contact Q connects the hammer rotation axis P2 and the switch rotation axis P3). In particular, the contact Q is set so as to be located on the surface SF3 when the contact comes into contact during the key pressing process.

The contact point Q describes an arc-shaped locus having a radius RH about the hammer rotation axis P2. On the other hand, the switch unit 3
The contact point Q on the sliding contact surface 3a1 of the hammer 2 gradually moves due to the sliding of the switch driving unit 2e of the hammer 2, and the distance from the switch rotation axis P3 to the contact point Q gradually changes. That is, for example, from the start of sliding contact to the point of contact contact via the intermediate position, the contact point Q is at points QA, QB, Q as shown in FIG.
Move to C. Accordingly, the distance (radius) from the switch rotation axis P3 to each contact point Q is RA, RB, RC.
(RA>RB> RC). As a result, the moving distance of the contact point Q on the sliding contact surface 3a1, that is, the relative sliding distance D of the switch driving unit 2e relative to the sliding contact surface 3a1 is:
It is represented by the following formulas 1 and 2. Here, D1 is a sliding distance from the start of sliding contact to the intermediate position, and D2 is a sliding distance from the intermediate position to contact contact.

[0055]

D1 = RA-RB

[0056]

D2 = RB-RC As is apparent from the figure, the sliding distance D2 is equal to the sliding distance D1.
Less than. That is, during the key pressing process, the contact Q is set to the surface SF3.
The closer the distance, the smaller the sliding distance D. In the present drive unit structure, as described above, the contact point Q is set to the surface SF at the time of contact.
3, the frictional force between the hammer 2 and the switch unit 3 can be reduced most when the contact is in contact.

Further, in this drive unit structure, the contact point Q is always set to the hammer rotation axis P2 and the switch rotation axis P during the key pressing stroke.
3 (inside). That is, the contact point Q is set so as to draw a locus between the hammer rotation axis P2 and the switch rotation axis P3 (inside instead of outside).

FIGS. 8 and 9 are diagrams schematically showing the contact state between the switch driving section 2e of the hammer 2 and the sliding contact surface 3a1 of the switch section 3. FIG. FIG. 8 shows that the contact point Q has a hammer rotation axis P.
FIG. 9 shows a case where the contact point Q is located between (inside) the switch rotation axis P3 and the switch rotation axis P3 (this embodiment). Axis P3
The figure shows another embodiment in which it is not located between the two and is located outside. 8 and 9, (A) shows a state at the start of sliding contact, for example, and (B) shows a state at the time of contact contact.

The switch driving section 2e of the hammer 2 does not always strictly contact the sliding contact surface 3a1 of the switch section 3 at the same point in the key pressing stroke. This is because both the hammer 2 and the switch unit 3 rotate around different rotation axes.

That is, as shown in FIG. 8, as the hammer 2 rotates downward, the switch drive section 2e rotates counterclockwise, and acts on the sliding contact surface 3a1 to roll leftward in the figure. As a result, the switch driving unit 2e moves to the sliding contact surface 3a.
1 at point Q1 at the start of sliding contact, and at point Q1 'at contact point contact. Since the direction in which the switch driving unit 2e slides on the sliding contact surface 3a1 coincides with the above-mentioned rolling direction of the switch driving unit 2e (the left side in the figure), the actual sliding between the switch driving unit 2e and the sliding contact surface 3a1 is performed. The distance is reduced by the arc length S1 from the apparent sliding distance. Thereby, the sliding distance can be shortened.

On the other hand, in another embodiment shown in FIG. 9, the switch driving section 2e rotates counterclockwise as the hammer 2 rotates downward. However, the hammer rotation axis P
2 and the switch rotation axis P3 are both to the right of the contact point Q, and the switch rotation axis P3 is closer to the contact point Q. As a result, the switch driving unit 2e slightly moves to the right on the sliding contact surface 3a1. Acts to roll. The switch drive unit 2e contacts the sliding contact surface 3a1 at the point Q2 at the start of the sliding contact, and contacts the sliding surface 3a1 at the point Q2 'at the time of the contact contact. Since the rolling action of the switch drive unit 2e in the direction in which the switch drive unit 2e slides on the sliding contact surface 3a1 (rightward in the figure) is small, the switch drive unit 2e and the slide contact surface 3a
The actual sliding distance with 1 is smaller than the apparent sliding distance only by the arc length S2. This arc length S2 is smaller than the arc length S1.

As described above, during the key pressing process, when the contact Q approaches the surface SF3 including both the rotation axes P2 and P3 of the hammer 2 and the switch unit 3, the position setting as shown in FIG. The sliding distance between the hammer 2 and the switch unit 3 can be further reduced. Moreover, in the present embodiment, the contact Q
Are set so as to pass through the surface SF3, so that the contact Q approaches the surface SF3 in the same manner as in the initial stage of the return from the key depression lower limit position. Therefore, it is possible to reduce the sliding amount at the initial stage of the key pressing operation, which is an important operation timing accompanied by the acceleration operation, and to reduce the key pressing resistance.

In order to achieve the same effect, it is not always necessary to set the contact point Q to completely pass through the surface SF3, and the hammer rotation axis P2 and the switch rotation axis P
The line segment SF3L (same as the surface SF3 on the paper surface of FIG. 8) connecting the point Q1′L (the point in the example shown in FIG. (The same position as Q1 ').

According to the present embodiment, since the hammer rotation axis P2 is set so as to exist in the surface SF1 including the sliding contact surface 2d of the hammer 2 (FIG. 4), the frictional force generated by the sliding is reduced. It does not act on the hammer 2 as a rotational moment. Also,
Surface SF including sliding contact surface 3a1 of bulging portion 3a of switch portion 3
Since the hinge portion 3c is set so as to be present in FIG. 2 (FIG. 5), the frictional force generated by sliding does not act on the switch portion 3 as a rotational moment. Therefore, since the resistance due to the rotational moment does not act on the driven component, the driving and driven operations are stabilized, and the transmission accuracy of the operation can be improved. Specifically, the hammer 2 is a driven body, which contributes to an improvement in a touch feeling, and the switch section 3 is a driven body, which contributes to an improvement in key pressing accuracy and an improvement in a touch feeling.

Further, according to the present embodiment, the surface including the sliding contact surface 3a1 of the switch portion 3 is set so as to pass through the hammer rotation axis P2 in the rotation driving process of the hammer 2 (FIG. 6). At the time of the passage, a rotational moment about the hammer rotation axis P2 is not generated in the hammer 2 by the frictional force generated by the abutment sliding, and the resistance applied to the driving operation is minimized. Therefore, it is possible to improve the transmission accuracy of the operation by stabilizing the operation of the drive and the driven, and to improve the touch feeling of the key by reducing the key pressing resistance.

In particular, since the hammer rotation axis P2 is set so as to exist in a plane including the sliding contact surface 3a1 of the switch unit 3 when the contact is brought into contact (FIG. 6), the most important contact for detecting the key-pressing operation. The driving and driven operations at the time of contact can be stabilized, and the detection accuracy of the key pressing operation can be improved.

Further, according to the present embodiment, the contact point Q is set so as to pass through the surface SF3 including the hammer rotation axis P2 and the switch rotation axis P3 in the rotation driving process of the hammer 2 (see FIG. 8) The amount by which the hammer 2 slides relative to the switch unit 3 can be minimized, and the resistance to driving and driven operations can be reduced by reducing friction. Therefore, the driving and driven operations can be stabilized, and the transmission accuracy of the operations can be improved. Further, the key pressing resistance is reduced, the touch feeling of the key is improved, and the durability of the drive unit itself is also improved.

In particular, when a contact is made during the key pressing process, the contact Q
Are set so as to be located on the SF3 (FIG. 8), so that the driving and driven operations at the time of contacting the contacts, which are the most important for detecting the key pressing operation, are stabilized, and the detection accuracy of the key pressing operation is improved. be able to.

Further, according to the present embodiment, in the key pressing stroke, the contact point Q is set so as to draw the locus between the hammer rotation axis P2 and the switch rotation axis P3 (inside instead of outside). Therefore (FIG. 8), the sliding distance can be shortened, and the sliding amount can be reduced at the beginning of the forward operation of driving and driven as compared with the last period. Therefore, the key-pressing resistance can be reduced at the initial stage of the key-pressing operation, which is an important operation timing accompanied by the acceleration operation, and the driving and driven operations can be stabilized to improve the key touch feeling.

In this embodiment, the surface including the sliding contact surface 3a1 of the switch portion 3 is set so as to pass through the hammer rotation axis P2 in the rotation driving process of the hammer 2 (FIG. 6). The same relationship as described above may be applied to the key 1 as the driving body and the hammer 2 as the driven body. With this, the same effect can be obtained.

The time when the hammer rotation axis P2 exists in the plane including the sliding contact surface 3a1 of the switch unit 3 is set at the time of contact abutment. (Stroke up position). Thereby, by stabilizing the driving and driven operations at the time when the touch of aftertouch is most affected,
Touch feeling can be further improved.

In the present embodiment, the contact point Q passes through the surface SF3 including the hammer rotation axis P2 and the switch rotation axis P3 during the rotation driving process of the hammer 2, and further, during the key pressing stroke, Rotation axis P2 and switch rotation axis P3
(Inside instead of outside), the contact point Q is set so as to draw its trajectory (FIG. 8), but the same relationship is established between the key 1 as the driving body and the hammer 2 as the driven body. May be applied. With this, the same effect can be obtained.

The time when the contact point Q is located on the above SF3 is set at the time of contact of the contact point during the key pressing process (FIG. 8).
This may be set at the time when the key 1 is at the lower limit position of the key pressing stroke. Thereby, the touch feeling can be further improved.

In the present embodiment, for example, the switch driving section 2e of the hammer 2 as a driving body is formed in a convex curved shape, and the switch section 3 as a driven body that slides in contact with the switch driving section 2e.
Although the sliding surfaces 3a1 are formed in a flat shape, the sliding relationship may be reversed by reversing the shapes. Moreover, the plane formed in a planar shape may not be a strict plane, and may be a gentle curved surface having a small curvature, for example. The same applies to the key 1 as a driving body and the hammer 2 as a driven body.

[0075]

As described above, according to the first aspect of the present invention,
According to the drive unit structure of the keyboard device according to the above, a rotational moment about the rotation fulcrum does not occur due to the frictional force generated by the contact sliding between the driven body and the actuator, and the rotation of the driven body No resistance force acts as a rotational moment. Therefore, the driving and driven operations can be stabilized, and the transmission accuracy of the operations can be improved.
For example, if the present invention is applied to a key driving unit, the touch feeling of the key can be improved by reducing the key pressing resistance.

According to the drive unit structure of the keyboard device according to the second aspect, the touch feeling can be improved when the driven body is a mass body, and the key is pressed when the driven body is a switch body. It is possible to improve the accuracy and the touch feeling.

According to the drive unit structure of the keyboard device of the third aspect, when the surface including the sliding contact surface of the driven body passes through the second rotation fulcrum, the actuator is brought into contact with the driven body. A rotational moment about the second rotation fulcrum does not occur due to the frictional force generated by the sliding, and the resistance given to the rotation of the actuator by the driving operation is minimized. Therefore, the driving and driven operations can be stabilized, and the transmission accuracy of the operations can be improved. For example, if the present invention is applied to a key driving unit, the touch feeling of the key can be improved by reducing the key pressing resistance.

According to the drive unit structure of the keyboard device according to the fourth aspect, the resistance given to the rotation of the actuator when the key switch contacts the switch board is minimized.
Therefore, it is possible to stabilize the driving and driven operations of the key switch, which is the most important for detecting the key pressing operation, when the key switch comes into contact with the switch board, and improve the detection accuracy of the key pressing operation.

According to the drive unit structure of the keyboard device according to the fifth aspect, the resistance given to the rotation of the actuator when the key reaches the lower limit position in the key pressing stroke is minimized. Therefore, the touch feeling can be improved by stabilizing the driving and driven operations when the key reaches the lower limit position in the key pressing stroke that most affects the feeling of after touch.

According to the drive unit structure of the keyboard device of the sixth aspect, when the contact point where the actuator contacts the driven body passes through the line connecting the first rotation fulcrum and the second rotation fulcrum, Since the first and second fulcrum and the contact point are substantially in the same plane, the amount of sliding of the actuator relative to the driven body is minimized. Therefore, the amount by which the actuator slides with the driven body can be reduced,
By reducing the friction, the resistance to driving and driven operations can be reduced. Therefore, the driving and driven operations can be stabilized, and the transmission accuracy of the operations can be improved. For example, if the present invention is applied to a key driving unit, the touch feeling of the key can be improved by reducing the key pressing resistance. Further, the durability of the driving section itself can be improved.

According to the drive unit structure of the keyboard device according to the seventh aspect, the amount of sliding of the actuator with the driven body when the key switch most important for detecting the key pressing operation comes into contact with the switch board is minimized. Thus, the driving and driven operations can be stabilized, and the detection accuracy of the key pressing operation can be improved.

According to the drive unit structure of the keyboard device according to the eighth aspect, the amount by which the actuator slides with the driven body when the key reaches the lower limit position in the key stroke that most affects the aftertouch feeling is determined. This can be minimized, and the driving and driven operations can be stabilized to improve the touch feeling.

According to the drive unit structure of the keyboard device of the ninth aspect, the amount by which the actuator slides on the driven body is reduced. Therefore, the sliding amount can be reduced at the beginning of the forward operation of driving and driven as compared with the end thereof, and as a result, the frictional force can be reduced. Therefore, for example, keying resistance can be reduced at an important operation timing accompanied by a large number of acceleration operations at the beginning of the keying operation, and the touch feeling of the key can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a drive unit structure of a keyboard device according to an embodiment of the present invention.

FIG. 2 is a sectional side view taken along the line II-II of FIG. 1 (non-key pressed state).
It is.

FIG. 3 is a side sectional view taken along the line II-II of FIG. 1 (key pressed state).

FIG. 4 is a partial sectional view of a hammer.

FIG. 5 is a cross-sectional view taken along line VV of FIG. 1 showing a detailed configuration of a switch unit.

FIG. 6 is a schematic diagram showing the hammer and the switch unit at the time of contact contact (at the time when the movable contact comes into contact with the fixed contact).

FIG. 7 is a schematic diagram showing a locus of a contact point Q during a key pressing stroke.

FIG. 8 is a view schematically showing a contact state between a switch driving section of a hammer and a sliding contact surface of the switch section (this embodiment).

FIG. 9 is a view schematically showing a contact state between a switch driving unit of a hammer and a sliding contact surface of the switch unit (another embodiment).

FIG. 10 is a diagram showing an example of a configuration of a drive unit structure of a conventional keyboard device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Key (actuator) 1a Key fulcrum part 1b Hammer drive part 2 Hammer (actuator, driven body, mass body) 2a Hammer fulcrum part 2d Sliding contact surface 2e Switch drive part 3 Switch part (driven body, switch body) 3a Expansion Protrusion 3a1 Sliding contact surface 3a2 Movable contact (key switch) 3a3 Movable contact (key switch) 3c Hinge 4 Chassis 8 Switch board 9 Supporting member 9a Hammer support 13 Buffer material Q Contact F1 Fixed contact F2 Fixed contact P1 Key contact Dynamic axis P2 Hammer rotation axis (second rotation fulcrum) P3 Switch rotation axis (first rotation fulcrum) SF1 plane SF2 plane SF3 plane SF3L Line segment

Claims (9)

[Claims] 1. A driven body having a planar sliding contact surface and rotatable about a rotation fulcrum, and abuttingly sliding on the sliding contact surface of the driven body to rotate the driven body. A drive unit structure for a keyboard device, comprising: a drivable actuator, wherein a rotation fulcrum of the driven body is present in a plane including a planar sliding contact surface of the driven body. 2. The apparatus according to claim 1, wherein the driven body is one of a mass body for giving inertia to the key pressing operation and a switch body having a key switch for detecting the key pressing operation. 2. The drive unit structure of the keyboard device according to 1. 3. A driven body having a planar sliding contact surface and rotatable around a first rotation fulcrum, and a driven body rotatable about a second rotation fulcrum and sliding on the driven body. An actuator capable of rotating the driven body by abutting sliding on a contact surface, wherein a surface including a sliding contact surface of the driven body is a second rotation fulcrum during a rotation drive process by the actuator. The drive unit structure of the keyboard device, characterized in that the drive unit is configured to pass through. 4. A key switch comprising a key and a switch substrate, wherein the actuator is configured to rotate by a key pressing operation, and wherein the driven body comprises a key switch for detecting a key pressing operation by contacting the switch substrate. 4. The keyboard device according to claim 3, wherein a surface including a sliding contact surface of said driven body passes through said second rotation fulcrum when said key switch comes into contact with said switch board. Drive section structure. 5. A device comprising a key, wherein the actuator is rotated by a key-pressing operation, and when the key arrives at a lower limit position in a key-pressing stroke, the driven member is in a plane including a sliding contact surface. The drive unit structure for a keyboard device according to claim 3, wherein the second rotation fulcrum is located. 6. A driven body having a sliding surface and rotatable about a first rotation fulcrum, and a driven body rotatable about a second rotation fulcrum and being rotatable about the second rotation fulcrum. An actuator capable of rotating the driven body by abutting sliding, wherein a contact point at which the actuator comes into contact with the driven body during a rotation driving process by the actuator is the first rotation fulcrum and A driving unit structure for a keyboard device, wherein the driving unit passes through a line connecting the second rotation fulcrum. 7. A key switch comprising a key and a switch substrate, wherein the actuator is configured to rotate by a key pressing operation, and wherein the driven body comprises a key switch for detecting a key pressing operation by contacting the switch substrate. When the key switch comes into contact with the switch board, a contact point where the actuator and the driven body come into contact with each other exists on a line connecting the first rotation fulcrum and the second rotation fulcrum. 7. The drive unit structure for a keyboard device according to claim 6, wherein: 8. A contact point comprising a key, wherein the actuator is rotated by a key-pressing operation, and the actuator and the driven body come into contact with each other when the key reaches a lower limit position in a key-pressing stroke. 7. The drive unit structure for a keyboard device according to claim 6, wherein the first and second rotational fulcrums are located on a line connecting the first and second rotational fulcrums. 9. A trajectory of a contact point where said actuator and said driven body contact each other intersects a line connecting said first rotation fulcrum and said second rotation fulcrum. A drive unit structure for a keyboard device according to any one of claims 6 to 8.