JP2554858Y2 - Electronic musical instrument touch response switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to an electronic musical instrument for obtaining a key touch similar to a key touch of a piano and obtaining a volume corresponding to a keying speed, particularly a touch response switch of an electronic piano. . (Prior Art) As a touch response switch of a conventional electronic piano, as shown in FIG. 8, a first dome-shaped body a, a second dome-shaped body b connected to the top and a cylindrical body c connected to the top are formed. integrally formed, an insulating elastic body e with a movable contact d _1, d ₂ so as to protrude downward on top of the top portion and the second dome-shaped body b of the first dome-shaped body a, the movable contact d _1, those consisting of a substrate g with a fixed contact f _1, f ₂ to respective opposite the d ₂ are known. This switch, press the key, moves downward the tubular body c, the movable contact d ₁ comes into contact with the fixed contacts f ₁ on the substrate g is first first dome a deformation, followed by a second dome-shaped body b is deformed, the movable contact d ₂ into contact with the fixed contacts f _2. Thus, a musical tone having a volume corresponding to the keying speed can be obtained from the time difference between the contact of the two sets of contacts. (Problems to be Solved by the Invention) According to the touch response switch described above, as can be seen from the pressing load characteristic for the key stroke shown in FIG.
Due to the deformation of the second dome-shaped body b following the deformation of the first dome-shaped body a, the pressing load of the key from Y to Z increases, and the pressing load increases as the key is pressed, so that the finger is abnormal. I feel oppressed. On the other hand, in the piano, when the key is pressed, the pressing force is constant (A) as shown in FIG. 7 before the damper contacts the strings, and the pressing force increases from the point where the damper contacts the strings (B).
Pressing it further releases the jack from the hammer roller.
Since this is generally called let-off, a peak of the pressing force appears (C), and the key has a key Stoke-load characteristic in which the pressing force decreases once to reach the end point of the stroke. Therefore, there has been an inconvenience that a key touch similar to a piano cannot be obtained with an electronic piano using a conventional switch. An object of the present invention is to provide a conventional touch response switch of an electronic musical instrument without such inconvenience. (Means for Solving the Problem) In a touch response switch in which two movable contacts sequentially contact corresponding two sets of fixed contacts by keying, a non-click type dome-shaped body and a click action connected to a top edge thereof are provided. A click-shaped body and a tubular body connected to the click-shaped body are integrally formed, and a first movable contact is provided at one of the top of the non-click-shaped dome and the bottom of the click-shaped body. And an insulating elastic body provided with a second movable contact so as to protrude downward, and first and second fixed contacts mounted with the insulating elastic body and opposed to the first and second movable contacts, respectively. The non-click type dome-shaped body is first deformed by movement of the cylindrical body by keying.
The movable contact comes into contact with the first fixed contact after the non-click type dome-shaped body (hereinafter, referred to as a dome-shaped body) is deformed. The load is set such that a click action is performed after contact with the contact point to generate a peak portion of the pressing load and a valley portion following the pressing portion in the latter half of the key stroke.
The second movable contact comes into contact with the second fixed contact after the click-shaped body performs a click action. (Operation) When the key is pressed, the pressing force of the key becomes constant as shown by A 'in FIG. 6 until the key comes into contact with the cylindrical body. Is deformed, and the pressing force increases as shown by B '. When the cylindrical body further moves down,
The click-shaped body buckles and deforms (this is referred to as "click action"), so that a mountain C 'having a large pressing force is formed, and once the load is reduced, the key reaches the bottom dead center. The keystroke-pressing load characteristic is very similar to the keystroke-pressing load characteristic of the piano shown in FIG. 7 in a static manner, so that there is no feeling of pressure on the finger unlike the related art, and the key touch is remarkably improved. You. (Embodiment) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a key device of an electronic piano using a touch response switch according to an embodiment of the present invention shown in FIG. 1 and 2, reference numeral 1 denotes a key. The key 1 has a weight 2 fixed to a rear end of a fulcrum. When the hand is released, the rear end of the fulcrum comes into contact with a keyboard pillow 3, and a key 1 is provided. Is depressed, a pressing force as shown in A 'of FIG. 6 is required. Reference numeral 4 denotes a touch response switch, which is mounted on the shelf 5 via a spacer 6. The touch response switch 4 includes an elastic insulator 7 made of, for example, rubber or the like and a printed circuit board 8. The elastic insulator 7 has a dome-shaped body 10 having a base 9 at a lower end and a click connected to an opening edge of a top portion thereof. A torch-like body 11 as a mold body and a cylindrical body 12 connected thereto are integrally formed, and a ring-shaped first movable contact 13 is provided at the top of the dome-like body 10 so as to project downward. A second movable contact 14 is provided on the bottom of the body 11 so as to protrude downward, and the first movable contact piece 13 is provided on the printed circuit board 8 as shown in FIGS. A pair of first fixed contacts 15 to be connected and a pair of second fixed contacts 16 to be connected by the second movable contact 14 are formed by printing. In FIG. 1, reference numeral 17 denotes a key stopper, and in FIG. 3, reference numeral 18 denotes an insulating coating. According to this embodiment, when the key 1 is pressed, the elastic insulator 7 is pressed.
The cylindrical body 12 moves downward, the dome-shaped body 10 first deforms, and the first movable contact 13 and the first fixed contact 15 come into contact. Next, a force is applied to the torso-shaped body 11, which buckles and deforms, and the second movable contact 14 and the second fixed contact 16 come into contact. 4 and 5 show another embodiment of the present invention. In this embodiment, the elastic insulator 7A is a dome-shaped body 10A having a base 9A at the lower end, a flute-shaped body 11A connected to the top end edge and protruding downward, and a cylindrical shape protruded upwardly connected to the flute-shaped body 11A The body 12A is formed integrally with the first movable contact 13A, and the second movable contact 14A is provided on the lower surface of the top of the dome-shaped body 10A. Therefore, the first fixed contact 15A and the second fixed contact 16A, which are in contact with the first movable contact 13A and the second movable contact 14A, respectively, are the first fixed contact 15 and the second fixed contact 15 shown in FIG. It is formed on the printed circuit board 8A instead of 16. Thus, according to this embodiment, when the cylindrical body 12A is moved by the depression of the key, the dome-shaped body 10A is deformed and the first movable contact 13A at the bottom of the slash-shaped body 11A first becomes the first fixed contact 15A.
Contact, and then the plaque 11A buckles and deforms,
The movable contact 14A contacts the second fixed contact 16A. (Effects of the Invention) As described above, according to the present invention, when a key is pressed, two sets of contacts can contact with a time difference corresponding to the keying speed, and a sound volume corresponding to the keying speed can be obtained. It is possible to provide a touch-response switch with a simple structure and inexpensiveness that can obtain a key touch similar to a piano, which has a let-off feeling and always sounds after a let-off feeling even when the keyboard is slowly pressed down. It has the effect of being able to.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a key device of an electronic piano using a switch according to one embodiment of the present invention, FIG. 2 is a sectional view of the switch, and FIG. FIG. 4 is a cross-sectional view of a switch according to another embodiment of the present invention, FIG. 5 is a plan view of the printed circuit board, FIG. 6 is a diagram showing an example of a keystroke-pressing load characteristic of the present invention, FIG. 7 is a diagram showing a keystroke-pressing load characteristic of a grand piano, FIG. 8 is a sectional view of a touch response switch of a conventional electronic piano, and FIG.
The figure shows the keystroke of an electronic piano using the switch.
It is a figure which shows a pressing load characteristic. 1 ... key 2 ... weight 4 ... touch response switch 7, 7A ... elastic insulator 8, 8A ... printed circuit board 10, 10A ... dome-shaped body 11, 11A ... Cylindrical body 13, 13A First movable contact 14, 14A Second movable contact 15, 15A First fixed contact 16, 16A Second fixed contact

Continuation of front page    (56) References Japanese Utility Model Sho 58-91794 (JP, U)                 61-135393 (JP, U)                 60-160431 (JP, U)                 52-125432 (JP, U)

Claims (1)

(57) [Rules for requesting registration of utility model] In a touch response switch in which two movable contacts sequentially contact two corresponding fixed contacts by keying, a non-click dome-shaped body, a click-shaped body connected to a top edge thereof and performing a click action, and A cylindrical body connected to the mold body is integrally formed, and a first movable contact is provided on one of a top of the non-click dome and a bottom of the click-shaped body, and a second movable contact is provided on the other. The non-click type dome, comprising: an insulating elastic body provided so as to protrude downward; and a substrate mounted with the insulating elastic body and having first and second fixed contacts opposed to the first and second movable contacts, respectively. The body is first deformed by movement of the cylindrical body by keying, and the first movable contact is the first fixed contact after the non-click dome-shaped body is deformed. The click-shaped body generates a peak portion of the pressing load and a valley portion following the pressing portion in the second half of the key stroke by performing a click action after the first movable contact contacts the first fixed contact. Wherein the second movable contact comes into contact with the second fixed contact after the click-shaped body performs a click action. .