JPH04159597A - Keyboard device - Google Patents

Abstract

PURPOSE:To make a whole device thin by arranging a hammer arm for a black key in the under space of a white key between the front edge of the black key and the front edge of the white key to be arranged adjacently to the side of this black key. CONSTITUTION:An under space 50 is formed under two white keys 10 between a front plate 19 of a black key 11 and a front plate 43 of the two white keys 10 arranged adjacently to both side of the black key (accurately to say, two white key guide parts 45), and in the under space 50, a hammer arm 51 for the black key is arranged. And both shaft parts 52 of the hammer arm 51 are inserted into the black key 11 through a notched part 54 formed under the front plate 19 of the black key 11, and attached rotatably to bearing parts 55 formed at opposite prescribed positions under both side plates 18 at the front edge of the black key 11 through bearings 56 respectively. Thus, regarding the black key 11 especially, it is possible to thin the whole device, and the number of part can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a keyboard device for a keyboard instrument such as an electronic piano.

[Prior art] In keyboard instruments such as electronic pianos, it is possible to obtain a key touch feeling similar to that of an acoustic piano. The hammer arm, which has a weight of 11, can be rotated vertically.When the key is pressed, the hammer arm rotates against its own weight, which causes the key to be rotated. Many of them are designed to apply a predetermined axicon load to the

By the way, in conventional keyboard instruments like this, when talking about the black keys, the rear end of the black keys is generally rotatably supported on the rear @ part of the key frog chassis, and the front part of the black keys is protruded from the lower part. The approximately T-1 shaped stopper piece provided is passed through the hole formed in the 611 part of the keyboard chassis to the upper limit stopper member common to each black key, which is made of a band-shaped rubber or the like provided inside the keyboard chassis. When the black key is positioned downward, the upper limit l1l (non-key position) of the black key is regulated by the flange of the black key coming into contact with the first limit stopper member. .

In this way, in the 5 conventional #V musical instruments, an upper limit stopper member, etc., which is common to the black keys, is provided below the first black key.
Compared to the front and lower parts of the black keys, there is a space at the rear and lower parts of all but one of the black keys. A hammer arm is provided below the rear side of the black key so as to be rotatable in the vertical direction.

[Problems with the prior art] However, with such a conventional keyboard instrument, for example, #! In the case of a belt type transposed and driven by a pond, if a dry cell storage section is provided below the rear side of the black key, the dry cell storage section will be provided below the rear side of the black key. Therefore, there was a problem in that the thickness of the entire instrument became thicker. The overall thickness of the instrument can be made thinner by providing a dry cell storage section at a suitable location other than the bottom of the hammer arm, but in this case, the space occupied in the horizontal direction of the instrument as a whole increases. become.

In addition, in such conventional keyboard instruments, the hammer arm is provided on the lower blade on the rear side of the black key so that it can rotate in the vertical direction, so the shaft for rotatably supporting the hammer arm,
You will need a support to support both ends of this shaft, and screws to attach this support to the keyboard chassis.
There was a problem that the number of parts was large and the cost was high.

[Object of the invention] This invention was made in view of the following two circumstances.
The purpose is to provide a keyboard device in which the overall thickness of the device can be made thinner, and the number of parts can be reduced, especially regarding the black keys.

[Summary of the Invention] In order to achieve the above object, the present invention includes a black key in the lower space of the white key between the front end of the black key and the front end of the white key arranged adjacent to the side of the black key. The main point is that a hammer arm for a key is arranged, and the rear part of the hammer arm for a black key is rotatably attached to the front end of the black key.

"Example code" Hereinafter, the present invention will be described in detail with reference to Examples.

FIG. 1 shows the main parts of an electronic keyboard instrument to which a first embodiment of the present invention is applied.

This electronic keyboard instrument includes a keyboard chassis 1 made of synthetic resin (or sheet metal V). In the keyboard chassis l, the rear chassis part 3 on the left side is higher than the front chassis part 2 on the right side in FIG. It has a slightly sloping structure that gradually increases in height. When this keyboard chassis 1 is assembled into a portable musical instrument body case (not shown), a certain amount of space is formed below the rear chassis m3 compared to the space below the front chassis section 2, and a portion of this space is formed below the rear chassis m3. The dry battery storage section 5 is configured by the sections.

On the top side of the keyboard chassis l, there are multiple white #! made of synthetic resin!
10 and black #! 11 are arranged in parallel, black I'll will be explained first.

Black flAll is designed so that the protrusion 12 formed at the rear end is placed on the upper surface of a band-shaped buffer member 13 made of nonwoven fabric or the like provided at the rear of the upper surface of the rear chassis part 3 of the keyboard chassis l. A mounting portion 1 having a roughly inverted U-shaped cross section is formed at the rear of the portion 12 via a thin elastically deformable hinge portion 14.
5 is attached to the rear part of the upper surface of the rear chassis part 3 of the keyboard chassis l with screws 16, and is rotatable in the vertical direction by elastic deformation of the hinge part 14. The part of the black key 11 in front of the protrusion 12 includes a top plate 17 and two side plates 18 (
(see Fig. 2), a front plate 19, etc.

The black key 11 is urged upward by the elastic restoring force of the hinge portion 14, and is normally provided protruding from the front lower part of the upper plate 17 and both side plates 18, as shown by the solid line in FIG. A stopper piece 21 whose cross section is approximately 8-shaped and whose tip end is approximately L-shaped.
passes through the hole 22 formed in the middle chassis part 4 of the keyboard chassis 1 and comes into contact with a band-shaped upper limit stopper member 23 made of rubber or the like provided on the upper inner surface of the middle chassis part 4 of the keyboard chassis 1. It is positioned at a predetermined initial position (upper limit position). The lower end of the stopper piece 21 comes into contact with the upper surface of the front chassis section 2 of the keyboard chassis 1 below the stopper piece 21, thereby forming a band-shaped lower limit stopper member made of rubber or the like for regulating the lower limit position of the black key 11. 24 are provided. Side plate 18 of black key 11
The rear chassis part 3 of the keyboard chassis 1 below the center of
A band-shaped buffer member 27 made of rubber or the like is provided on the upper surface of the black key 11 to prevent noise from being generated due to contact with the central lower end of the side plate 18 of the black key 11.

At two predetermined locations on the lower central surface of the upper plate 17 of the black key 11, there are first and second switch pressing protrusions 31 each having a substantially cross-shaped cross section.
．． 32 protrudes downward. 1st and 2nd
First and second rubber switches 33, 34 are arranged below each of the switch pressing protrusions 31, 32. The first and second rubber switches 33 and 34 are provided on the upper surface of a circuit board 35 disposed on the lower surface side of the rear chassis portion 3 of the keyboard chassis 1, and are provided on the upper surface of the circuit board 35 disposed on the lower surface side of the rear chassis portion 3 of the keyboard chassis l. It projects above the rear chassis part 3 of the keyboard chassis l through holes 36 and 37.

The circuit board 35 has one end supported by a substantially L-shaped support part 38 formed on the lower surface of the rear chassis section 3 of the keyboard chassis 1, and the other end supported on the lower surface of the rear chassis section 3 of the keyboard chassis 1. It is supported on the free end of a substantially U-shaped elastic support part 39.

Next, to explain the white key 1o, since the white key 1° basically has almost the same configuration as the black key 11 explained so far, only the points that are different from the black key 11 explained so far will be explained. .

As is well known, the white key 10 is longer than the black key 11, and only this longer portion, ie, the front portion of the white key 10, is shown in FIG. To explain the front part of the illustrated white key 10, this part consists of the top plate 41, two side plates 42 (the fourth
(see figure) and a front plate 43. The lower end of the front plate 43 of the white key 10 comes into contact with the upper surface of the front chassis part 2 of the keyboard chassis 1 below the front plate 43 of the white key 10, so that a rubber member is provided to regulate the lower limit position of the white key 10. A band-shaped lower limit stopper member 44 made of, for example, is provided.

On the upper surface of the front chassis section 2 of the keyboard chassis 1 on the rear side of the lower limit stopper member 44, there is a white key guide section 45 that prevents the white key 1o from horizontally swinging and guides the vertical movement of the white key 10. (See Figure 4).

Returning to the black key 11 and continuing the explanation, the front plate 19 of the black key 11
A lower space is provided below the two white keys 10 between the front plate 43 (more precisely, the two white key guide parts 45) of the two white keys 10 arranged adjacent to both sides of the black key 11. 50 (see Fig. 4), and in this lower space 50 is a hammer arm for a black key (hereinafter simply referred to as a hammer arm).
) 51 are arranged. The hammer arm 51 is made of iron or the like and has a roughly inverted U-shape on its side, and in plan view, as shown in FIG. A middle arm part 51a extending up to 5 degrees, a front arm part 51b protruding from both front ends of the middle arm part 51a, and a rear arm part protruding from one predetermined location at the rear of the middle arm part 51a. 51c, and a shaft portion 52 (see FIG. 2) is provided on both rear side surfaces of the rear arm portion 51c, and a protrusion 53 having an approximately semicircular cross section is provided at a predetermined location on the lower surface of the middle arm portion 51a. It has a well-designed structure. Both shaft portions 52 of the hammer arm 51 are connected to a notch 54 (a second
Bearing portions 55 are inserted into the interior of the black #111 through the black key 111 (see figure), and are formed at predetermined positions facing each other at the lower part of both side plates 18 at the front end of the black key 11, as shown in FIG. are rotatably attached to each via a bearing 56. For example, as shown in FIG. 3, both shaft portions 52 of the hammer arm 51 are press-fitted into bearing holes 57 formed in the bearing portion 55 of the black key 11 from below the black key 11, and are directly rotatably mounted. You can do it like this.

The hammer arm 51 is biased clockwise in FIG. 1 around the shaft portion 52 by its own weight, but normally, as shown by the solid line in FIG. 1 and also shown in FIG. Both ends of the hammer arm 51 are placed on the horizontal upper surfaces of a pair of hammer position regulating sections 58 provided at two predetermined locations on the upper surface of the front chassis section 2 of the keyboard chassis l. The arm portion 51b is positioned at a predetermined initial position by coming into contact with a hammer stopper member 59 made of rubber or the like provided on the upper rear surface of each of the two white key guide portions 45 at the front thereof.

On each lower surface of the upper plate 41 of the two white keys 10 above both front arm portions 51b of the hammer arm 51, the upper surface of the front arm portion 51b of the hammer arm 51 is in contact with the lower surface of the upper plate 41 of the white key 1o. A shock absorbing member 60 made of rubber or the like is provided to soften the impact when the contact occurs.

Next, black in this electronic keyboard instrument! The operation of 1111 will be explained.

The black key 11 is connected to the elastic force of the hinge part 14 and the hammer arm 5.
When the black key 11 is pressed against the weight of the black key 11, the black key 11 is displaced clockwise downward in FIG. 1 while bending the hinge portion 14. Then, as the shaft portion 52 of the hammer arm 51 moves downward together with the side plate 18 of the black key 11, the hammer arm 51 resists its own weight, and both ends of the protrusion 53 move toward the pair of hammer position regulating portions 58. While sliding leftward on each horizontal upper surface in FIG. 1, it is rotated counterclockwise about the protrusion 53, as shown by the dashed line in the same figure. At this time, the resistance force of the hammer arm 51, which is urged clockwise in FIG. 1 by its own weight, acts as an action load on the side plate 18 of the black key 11 via the shaft portion 52.

Therefore, the key pressed is black #! A predetermined action load is applied to the black key 11 by the resistance force of the hammer arm 51, giving the player the feeling that the black key 11 is heavy.

In this way, this electronic keyboard instrument provides a key touch feeling that is similar to that of an acoustic piano. The key touch feeling will be described in more detail later.

On the other hand, the first and second switch pressing protrusions 31.32, which rotate integrally with the black key 11, press the first and second rubber switches 33.34, respectively, as shown by the dashed-dotted lines in FIG. Then, the first and second rubber switches 33
．． 34 are sequentially switched with a time difference t corresponding to the key pressing speed of the black key 11. Then, by switching the second rubber switch 34, key-on data that instructs the sound source section ([!l not shown) to start producing musical tones is obtained, and due to the time lag, data regarding the key pressing speed, that is, the timing of musical tones is obtained. Initial touch data for initial control of musical sound characteristics such as volume and timbre can be obtained.

When the key press operation on the black key 11 is released, the black key 11 is returned to the original initial position shown by the solid line in FIG. It is returned to the original initial position shown by the solid line in the figure.

In this way, in this electronic keyboard instrument, the hammer arm 5
1 is a lower space formed at the lower part of the two white keys 10 between the front plate 19 of the black @ 11 and the front plate 43 of the two white keys 10 arranged adjacent to both sides of the black key 11. 50, so that even if the dry battery storage part 5 is configured by a part of the space of a certain size formed below the rear chassis part 3 of the keyboard chassis 1, the dry battery storage part 5 and Since the hammer arms 51 do not overlap with each other, the overall thickness of the musical instrument can be made thinner with respect to the black keys 11.

In addition, in this electronic keyboard instrument, both shaft portions 52 of the hammer arm 51 are attached to predetermined positions facing each other at the lower part of the side plates 18 at the front end of the black key 11, as shown in FIG. 2 or 3. Since it is rotatably attached to the formed bearing portion 55 via the bearing 56 or directly, there is no need for a dedicated shaft for rotatably supporting the hammer arm 51, and the number of parts can be reduced accordingly. Therefore, it is possible to reduce the cost.

Here, the key touch feeling (1! load) of this electronic keyboard instrument will be described in detail. First, when the black key 11 is pressed with a weak key pressing force, at the initial stage of the key pressing, the elastic force of the hinge portion 14 of the black key 11 and the hammer arm A load consisting of the sum of the resistance force of 51 acts on the black key 11. When the black key 11 further moves downward and reaches the point indicated by the symbol B in FIG.
The switch pressing projections 31.32 begin to press the first and second rubber switches 33.34. Then, as indicated by C in FIG. 5, a load consisting of the elastic resistance of the first and second rubber switches 33, 34 acts on the black key 11. Then, at the time indicated by the symbol in FIG. 5, the first rubber switch 33 buckles and turns on, and then, at the time indicated by the symbol E in FIG. 5, the second rubber switch 34 buckles. It turns on. Therefore, as a result of the key-on data and initial touch data being sent to the sound source section, a musical tone having the volume and tone corresponding to the initial touch data at this time is generated. Further, when the downward displacement reaches the point indicated by the symbol F in FIG. 5, the black key 1
The lower end of the first stopper piece 21 contacts the lower limit stopper member 24, and the downward displacement of the black key 11 is regulated.

Next, when the black key 11 is pressed with a slightly stronger key pressing force, the symbol G in FIG. 6 is compared to the case in FIG. 5.
As shown in , the load acting on the black key 11 increases rapidly in the initial stage of key depression. When the black key 11 is further displaced downward and reaches the point indicated by the symbol H in FIG. 6, the protrusion 53 of the hammer arm 51 is rotated counterclockwise in FIG. As a result, as shown by the reference numeral in FIG. This will give you a feeling of suddenly becoming lighter.

Next, when the black key 11 is pressed with a strong key pressing force, as shown in FIG. 7, compared to the case of FIG.
At the initial stage of key depression, the load acting on the black key 11 becomes even greater, and the time point indicated by symbol H becomes earlier.

In the first embodiment, the upper surface of the hammer position regulating portion 58 for regulating the position of the hammer arm 51 is simply a horizontal surface, but the upper surface is not limited to this.

For example, as in the second embodiment shown in No. 8@, a click feeling providing protrusion 61 having an approximately semicircular cross section is provided on the horizontal upper surface of the hammer position regulating portion 58 on the left side of the protrusion 53 of the hammer arm 51; When the hammer arm 51 rotates as the black key 11 is pressed, its protrusion 53 slides leftward on the horizontal upper surface of the hammer position regulating portion 58 in the left direction in FIG. It may be configured to overcome this.

With this configuration, for example, when the black key 11 is pressed with a weak key pressing force, the second rubber switch 34 buckles and enters the on state, compared to the case shown in FIG. At the time indicated by symbol E, a load due to the resistance force generated when the protrusion 53 of the hammer arm 51 rides on the click sensation imparting protrusion 61 acts on the black key 11, as indicated by the symbol in FIG. When the protrusion 53 passes over the click sensation imparting protrusion 61, the load due to the resistance force generated at this time no longer acts on the black key 11. Therefore, in this case, after the second rubber switch 34 is turned on, the load acting on the black key 11 becomes slightly larger, and then the load acting on the black key 11 becomes slightly smaller.

Note that instead of the click feeling protrusion 61 on the horizontal upper surface of the hammer position regulating portion 58, there is provided a click feeling recess 6 with a semicircular cross section as in the third embodiment shown in FIG.
2 is provided, and when the hammer arm 51 rotates as the black key 11 is pressed, the protrusion 53 slides on the horizontal upper surface of the hammer position regulating portion 58 to the left in FIG. 1O, producing a click feeling. The structure may be such that the support that has entered the application recess 62 comes out.

If configured like this, for example, black #! When the key No. 11 is pressed with a weak key pressing force, compared to the case shown in FIG. As shown by the symbol M in the figure, the protrusion 53 of the hammer arm 51 enters the click feeling recess 62, so that the black key 1
The load acting on the black key 11 becomes slightly smaller, and then the protrusion 53 comes out of the click-feeling recess 62, so that the load acting on the black key 11 becomes slightly larger.

In the third embodiment shown in FIG. 1O, the hammer stopper member 59 is not provided on the upper rear surface of the white key guide portion 45. Instead, as shown in FIG. 10, a hammer stopper member 59A is provided on the upper surface of the front chassis section 2 of the keyboard chassis 1 on the rear side of the white key guide section 45, and a hammer stopper member 59A is provided at the lower end of the front arm section 51b of the hammer arm 51. comes into contact with this hammer stopper member 59A. [Effects of the Invention] As explained above, according to the present invention, the front end of the black key and the white key disposed adjacent to the side of the black key Since the hammer arm for the black keys is placed in the space below the white keys between the front end of the keyboard and the front end of the keyboard, the space of a certain size formed at the bottom of the rear of the keyboard chassis can be used as a battery storage area, etc. This allows the entire device to be made thinner for the black keys, and since the rear of the hammer arm for the black keys is rotatably attached to the front end of the black keys, the hammer arm for the black keys can be rotated. This eliminates the need for a dedicated shaft for supporting the device, which reduces the number of parts and reduces costs.

[Brief explanation of the drawing]

1 to 7 are for explaining an electronic keyboard instrument to which the first embodiment of the present invention is applied. l
Figure 2 is a longitudinal side view showing the main parts of an electronic keyboard instrument;
A sectional view taken along the line ■-■ in the figure, Figure 3 is a sectional view similar to Figure 2 showing another example of how the hammer arm is attached to the black key,
Figure 4 is a sectional view taken along line IV-IV in Figure 1, Figures 5-
7th FM is a diagram shown to explain the key guard weight, FIG. 8 is a vertical cross-sectional side view showing the main parts of an electronic keyboard instrument to which the second embodiment of the present invention is applied, and FIG. 9 is a diagram showing the second embodiment. FIG. 10 is a longitudinal sectional side view showing the main parts of an electronic keyboard instrument to which a third embodiment of the present invention is applied. 1... Keyboard chassis, 10... Group white key, 11...
...Black key, 19...Front plate of black key, 43.
...White key front plate, 45...White key guide section, 5o...Lower space of white key, 51...Hammer arm for black key, 52 ...Shaft of hammer arm, 53 ...Protrusion of hammer arm, 5
8...Hammer position regulation section, 59.59A...
... Hammer stopper member, 61. Old... Protrusion for giving a click feeling, 62 ... Recess for giving a click feeling 6 Patent applicant Casio Computer Co., Ltd. Figure 2 Figure 3 Figure 4 □Mori 1 Figure 5 Figure 9 Figure 11 Figure 6 Figure 7

Claims (4)

[Claims] (1) In a keyboard device including a hammer arm for a black key that rotates and displaces in accordance with the key depression operation of the black key and applies an action load to the black key, the front end of the black key and the black The hammer arm for the black key is arranged in the lower space of the white key between the front end of the white key arranged adjacent to the side of the key, and the rear part of the hammer arm for the black key is arranged in the space below the white key. A keyboard device characterized by being rotatably attached to the front end of a key. (2) The hammer arm for the black key is provided with a click feeling imparting means for imparting a click feeling to the hammer arm for the black key when the hammer arm for the black key is rotationally displaced in accordance with the key depression operation of the black key. The keyboard device according to claim 1. (3) A hammer arm for the black key is attached to a white key guide provided below the front end of the white key in order to prevent horizontal swing of the white key and guide the vertical movement of the white key. 2. The keyboard device according to claim 1, further comprising a stopper member for regulating a rotation limit position in the same direction when the keyboard device returns to the initial position. (4) a keyboard chassis that rotatably supports the black keys;
2. The keyboard device according to claim 1, further comprising a stopper member for regulating a rotation limit position in the same direction when the black key hammer arm rotates back to its initial position.