JPH0623088U - Keyboard device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the impact noise generated when keystrokes. [Structure] A key guide piece 11b corresponding to each key 1 is attached to a base 1
The sound absorbing material 12 is adhered to the outer peripheral portion of the sub-frame 11 formed by bending from 1a to form the key guide portion 14, and the sub-frame 11 is connected to the main frame 2 via the sound absorbing material 12.
Screw to. An upper limit stopper 4 and a lower limit stopper 5 are attached to the lower surface and the upper surface of the sub-frame 11, and both side walls of the key and the stopper piece 1b are attached to the stopper 5, when the key is pressed and the key is returned.
The impact sound generated by contacting the contact point 4 is transmitted to the main frame 2 after passing through the sound absorbing material 12 twice.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a keyboard device in which a key is slidably supported by a key support member, and more particularly to a keyboard device having a key guide portion for preventing lateral vibration of the key and an upper limit stopper for restricting a return position of the key.

[0002]

[Prior art]

 Conventionally, as a keyboard device of this type, for example, one shown in FIG. 5 has been generally used.

In this keyboard device, a key guide piece 2b is formed by cutting and raising a keyboard frame 2 in which a rear end 1a of a key 1 is swingably supported by a key fulcrum 2a. A soft resin portion 2c is outserted to the outer peripheral portion of the key to form a key guide portion 2d. Both side surfaces of the key guide portion 2d guide inner wall surfaces of both side walls of the key 1 having a U-shaped cross section. This prevents the key 1 from swinging laterally.

A key return spring 3 is engaged between the key 1 and the keyboard frame 2 to urge the key 1 clockwise, and an upper limit stopper 4 made of felt or the like is attached to the lower surface of the keyboard frame 2. The same lower limit stoppers 5 are attached to the upper surface, and the upper and lower limit stoppers 4 and 5 are brought into contact with the stopper pieces 1b and 1d vertically attached to the key 1 to regulate the swing range of the key 1. ing.

[0005]

[Problems to be solved by the device]

 However, in such a conventional keyboard device, since the upper limit stopper and the lower limit stopper are directly attached to the keyboard frame, the impact sound at the time of keystroke is directly transmitted to the keyboard frame via these stoppers. There was a risk that the sound would be transmitted to the entire keyboard and reverberated, increasing its volume.

In addition, a large molding die is required for integrally molding the key guide portion and both upper and lower limit stoppers on a long keyboard frame, which makes assembly workability difficult and increases production cost. Was the result. Further, in order to stably receive the load when hitting the keys, the strength of the entire keyboard frame must be increased, which causes a problem that the keyboard device becomes significantly heavy.

The present invention has been made in view of the above points, and an object thereof is to reduce impact noise generated at the time of keystroke and improve molding workability and assembly workability.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, this invention has at least a key support member, a key rotatably supported by the key support member via a support portion, and a key guide portion for preventing lateral swing of the key. In a keyboard device having an upper limit stopper that regulates the return position of the key, the key guide section and the upper limit stopper are configured as a sub-unit that is separate from the key support member, and the main body of this sub-unit absorbs noise. The present invention provides a keyboard device arranged on the key support member through a material.

[0009]

[Action]

 By configuring the keyboard device according to the present invention as described above, the impact sound at the time of keystroke is transmitted to the upper limit stopper → sound absorbing material → sub-unit main body → sound absorbing material → key supporting member. It is converted and the impact sound is significantly reduced. Also, by forming the subunit separately from the key support member, it becomes possible to significantly improve the molding workability and assembly workability of the parts.

[0010]

【Example】

 Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings, in which parts corresponding to those in FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view showing a part thereof, and FIG. 3 is a perspective view of a subunit thereof.

The white key 1 and the black key 1 ′ (hereinafter, referred to as “key 1”) are hemispheres formed in a rear end portion integrally with a resin material or the like with a U-shaped cross section with an open lower surface. The fulcrum 1a is slidably supported by the key fulcrum portion 2a of the main frame 2 of the metal plate which is the key supporting member, and L-shaped stopper pieces 1b are vertically provided on the lower surfaces of both side walls of the front portion. A key return spring 3 is engaged between the keys to urge the key 1 clockwise in the figure.

A sub-frame 11 of a sub-unit 10 is attached to a front portion of the main frame 2 with a set screw 9 via a sound absorbing material 12 described later. The subunits 10 are, for example, a set of 12 in units of octaves, and the subframe 11 forming the main body of each subunit 10 includes a plurality of key guide pieces bent from the base portion 11a corresponding to each key. It has an L-shaped cross section having 11b.

A sound absorbing material 12 such as a soft elastomer or foam is integrally formed on the outer peripheral portion of the sub-frame 11 by an outsert process. The key guide piece 11b and the sound absorbing material 12 adhered to the outer peripheral portion of the key guide piece 11b. The key guide portion 14 is constituted, and the side wall of the key guide portion 14 is brought into sliding contact with the inner wall surfaces of both stopper pieces 1b of the key 1 to prevent lateral swing of the key.

Then, the upper limit stopper 4 and the lower limit stopper 5 are attached to the lower surface and the upper surface of the base portion 11a of the sub-frame 11 via the sound absorbing material 12, and at the time of keying shown by phantom lines in FIG. The lower surface of both side walls abuts the lower limit stopper 5 to regulate the lower limit position of the key 1. When the key returns, the stopper piece 1b of the key 1 abuts the upper limit stopper 4 to regulate the return position of the key 1. ing.

Further, as shown in FIG. 1, a substrate 6 is fixed to the lower surface of the main frame 2 with set screws 7, 7, and a bowl-shaped upper surface of the substrate 6 corresponding to each key. A well-known contact rubber member 8 having a bulge portion is arranged, and an actuator 1c vertically provided on the lower surface of the key 1 at the time of keystroke elastically deforms the contact rubber member 8 to close the key switch. By doing so, a musical sound is generated.

Since this embodiment is configured as described above, the impact sound generated when the lower surfaces of both side walls of the key 1 abut on the lower limit stopper 5 at the time of keystroke, and the stopper piece 1b of the key 1 at the upper limit when the key is returned. The impact sound generated when the stopper 4 abuts is transmitted to the sub-frame 11 via the lower limit or upper limit stoppers 5 and 4 and the sound absorbing material 12, and again to the main frame 2 via the sound absorbing material 12. In this process, the energy of the impact passes twice through the sound absorbing material 12 and is converted into heat energy, and the impact sound transmitted to the keyboard device via the main frame 2 can be significantly reduced.

Further, as compared with the conventional keyboard device in which the main frame is cut and raised to form the key guide portion, the sub frame serves as a reinforcing material and has no cut and raised hole. The strength of the key increases remarkably, and by providing the lower and upper limit stoppers on the upper and lower surfaces of this sub-frame, the rocking range of the key can always be stabilized to a constant amount.

Further, by disposing the subunit having the key guide portion separately from the long main frame, it becomes possible to divide the subunit into a size that is easy to form and assemble.

Next, FIG. 4 shows another embodiment of the present invention. Instead of integrally forming the sound absorbing material 12 on the sub-frame 11 by outsert processing, each sound absorbing member 12a 'and the key formed in advance are formed. Slits 12a "and 12b" are provided in the sound absorbing member 12b 'which is continuous in the arrangement direction, and the sound absorbing members 12a' and 12b 'are respectively covered on the base portion 11a and the key guide piece 11b of the bent subframe 11. The other configurations are the same as in the previous embodiment. According to this embodiment, since the subframe and the sound absorbing member can be processed in separate dedicated processes, production can be performed with simple equipment.

In the above embodiment, the key fulcrum portion is provided on the main frame, but it may be provided on another member and attached to the main frame. The lower limit stopper of the key is the keyboard device of the electronic musical instrument. In this case, the contact rubber member can also be used, and it is not always necessary. Further, the sub-unit may be attached to the main frame not by a set screw but by an adhesive or the like.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the keyboard device of the electronic keyboard musical instrument has been described, but the present invention is not limited to this and can be applied to a keyboard device such as a piano touch. .

[0022]

[Effect of device]

 As described above, in the keyboard device according to the present invention, the key guide portion and the upper limit stopper of the key are configured as the subunit, and the main body of the subunit is arranged on the key supporting member via the sound absorbing material. Therefore, the volume of the impact sound at the time of keystroke is transmitted to the key support member after passing through the sound absorbing material twice, and is greatly reduced.

Further, since the subunit having the key guide portion is configured as a separate body and is disposed on the key supporting member, it is possible to double the strength of the key supporting member at the time of keying due to the double structure. It will be possible.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a part of the same in an enlarged manner.

FIG. 3 is a perspective view showing the subunit of the same.

FIG. 4 is an exploded perspective view showing a subunit of another embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating a conventional keyboard device.

[Explanation of symbols]

1 ... Key, 2 ... Main frame, 3 ... Key return spring, 4 ... Upper limit stopper, 5 ... Lower limit stopper, 6 ... Board, 7,9 ... Set screw, 8 ... Contact rubber member, 10 ... Subunit, 11
… Subframe, 12… Sound absorbing material, 14… Key guide part

Claims (1)

[Scope of utility model registration request] 1. A key support member, a key rotatably supported by the key support member via a support portion, a key guide portion for preventing lateral swing of the key, and at least a return position of the key is regulated. In the keyboard device having an upper limit stopper, the key guide portion and the upper limit stopper are configured as a subunit that is separate from the key support member, and the main body of the subunit is provided with a sound absorbing material. A keyboard device characterized in that it is arranged in.