JPH0734462Y2 - Electronic musical instrument key - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a key of an electronic musical instrument having a key touch similar to that of an acoustic piano.

(Prior Art) Conventionally, as a key a of an electronic musical instrument, as shown in FIG. 6, a tension spring c is stretched between a base end portion and a keyboard chassis b and a weight d is added to the tip end portion. Are known.

(Problems to be solved by the invention) The conventional key touch of this electronic musical instrument was completely different from that of an acoustic piano.

The present invention provides a key for an electronic musical instrument which has a key touch close to that of an acoustic piano, has little change in the height of the key over time, and can be easily finely adjusted, and can also make the keyboard compact. Is its purpose.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention has a key in which a key height adjusting screw is screwed to the rear part across a fulcrum so that the lower end contacts the keyboard pillow. And a cross-section reverse L which is erected on the rear side of the key and in which a plurality of comb tooth pieces are formed in the horizontal portion corresponding to the pitch of the key and a plurality of through holes are formed in the vertical portion corresponding to the pitch of the key. A leaf spring support member having a U-shape and a leaf spring bent in a U shape are provided, one end of the leaf spring is locked to the rear end surface of the key, the bent portion is fitted in the through hole, and the other end is The leaf spring supporting member is engaged with the bottom edge of the recess between the comb teeth, and the engaging portion at the other end of the spring has a reaction force of a predetermined pressing force of the key at the beginning of the pressing of the key. When the key is pushed further down, the spring bends with the locking portion at the other end as a fulcrum and the amount of deflection of the spring does not increase. It is set at a position where it rotates in a state in which the reaction force of the pressing force is small.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, (1 ₁ ) and (1 ₂ ) are wooden white keys and black keys, respectively. These white keys (1 ₁ ) and black keys (1 ₂ ) are fulcrum points on the reed (2). It is arranged to be swingable around (3). Since the white key (1 ₁ ) (black key) (1 ₂ ) has the same structure, only the white key (1 ₁ ) will be described below. ), An actuator (5) for operating a switch (4) arranged on the reed (2) is attached, and a key height adjusting screw (6) is provided in the rear part across the fulcrum. Is screwed on,
The lower end of the screw (6) abuts on a keyboard pillow (7) which is fixed on the reed (2) and is made of, for example, a felt having a thickness of 1 mm. Further, one end of a leaf spring (8) having a width b curved in a substantially U shape is locked to the end surface of the rear right portion with this fulcrum interposed, and the width b of the other end of the leaf spring (8) is held. And the width a (a <b) are bound to the fulcrum (11) of the leaf spring support member (10) having an inverted L-shaped cross section fixed to the positioning member (9) of the reed (2). Has been done.

The horizontal portion of the leaf spring support member (10) is formed in a comb tooth shape as shown in the second illustration, and the pitch of the comb tooth pieces (12) corresponds to the pitch of the keys (1 ₁ ) (1 ₂ ). The bottom edge of the recess (width a) between the comb teeth (12) and (12) serves as the fulcrum (11). A large number of through holes (13) (width b) into which the curved portion of the leaf spring (8) is fitted are formed in the vertical portion. Fulcrum (1
1) The key (1 ₁₎ a leaf spring (8 stretched between the end face of the rear portion across the fulcrum of), in the beginning of the depression of the key, the reaction force of a predetermined pressing force of the key is the key It is bent so as to be obtained at the locking point (14) on the end face of (1 ₁ ), and when the key is further depressed, it rotates counterclockwise about the fulcrum (11) in the counterclockwise direction. There is little increase in the amount of bending and the variation in the reaction force of the key pressing force is small.

FIG. 3 shows the relative positions of the locking point (14) of the key (1), the fulcrum (11) of the leaf spring (8), and the fulcrum (3) of the key (1) at the beginning and end of the key depression. , The reaction force of the pressing force of the leaf spring (8).

According to this relational position, the reaction force P ′ at the end of the pressing of the key (1) does not change much with respect to the reaction force P at the locking point (14) at the beginning of the pressing of the key (1).

As the switch (4), for example, a switch composed of a movable contact mounted on the inner surface of the rubber bowl-shaped member and a fixed contact arranged so as to face the movable contact is used.

Next, the operation of this embodiment will be described.

When the white key (1 ₁ ) and the black key (1 ₂ ) are arranged on the reed (2), the key heights H are adjusted by the key height adjusting screws (6).

When the white key (1 ₁ ) or the black key (1 ₂ ) is pressed, a predetermined pressing force is required at the beginning of pressing the key, as shown in FIG. After that, the pressing force of the key itself is almost constant until the end of pressing the key, but since the pressing force is required to operate the switch (14), the pressing force of the key added with this is in the latter half of the stroke. It will rise slightly. The broken line in the figure is a line showing the load acting on the finger when the key is returned.

FIG. 5 shows another embodiment of the present invention.

In this embodiment, in place of the reed (2), the substrate two members (2 ₂₎ on the (2 ₁₎ (2 ₃₎ and is used as fixed and the substrate (2 ₁₎ A leaf spring support member (10 ') is formed integrally with the.

In this figure, the same symbols as those in FIG. 1 indicate the same elements.

(Effect of the invention) As described above, according to the present invention, a key touch similar to that of an acoustic piano can be obtained, the height of the key can be finely adjusted, and the keyboard pillow can be made thinner. It is possible to reduce the change in the height of the key with time and to make the keyboard compact.

[Brief description of drawings]

FIG. 1 is a side view of one embodiment of the present invention, FIG. 2 is a perspective view of the main part thereof, FIG. 3 is an explanatory view of operation, and FIG. 4 is a characteristic diagram showing the relationship between the stroke of a key and the load. 5 is a side view of another embodiment of the present invention, and FIG. 6 is a side view of a key of a conventional electronic musical instrument. (1 ₁ ) (1 ₂ ) …… White key, black key (2) …… Reed (3) …… Key fulcrum (4) …… Switch (5) …… Actuator (6) …… Key height adjustment Screw (7) …… Keyboard pillow (8) …… Leaf spring (10) (10 ′) …… Leaf spring support member

Claims (1)

[Scope of utility model registration request] 1. A key having a key height adjusting screw screwed on a rear portion with a fulcrum in between so that the lower end abuts on a keyboard pillow, and a key which is erected upright on the rear side of the key and has a pitch of the key on a horizontal portion. A leaf spring support member having a reverse L-shaped cross section, in which a plurality of comb-teeth pieces are formed correspondingly and a plurality of through holes are formed in the vertical portion corresponding to the key pitch;
A leaf spring bent in a U shape, one end of the leaf spring being locked to the rear end face of the key, the bent portion being fitted into the through hole, and the other end being the comb tooth piece of the leaf spring supporting member. The engaging portion at the other end of the spring bends the spring so that the reaction force of the predetermined pressing force of the key acts on the key at the beginning of the pressing of the key. No, when the key is pushed further down, the spring is set to a position where it rotates with the increase in the amount of flexure of the spring as a fulcrum and the variation in the reaction force of the key pressing force as the fulcrum with the other end as a fulcrum The key to the electronic musical instruments that have been created.