JP2007123290A - Keytop switch for electronic musical instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keytop switch for an electronic musical instrument, which is capable of easily positioning a keytop with accuracy at a predetermined position in a back and forth direction and a right and left direction of an operation panel, and reducing its manufacturing cost. <P>SOLUTION: A keytop switch 1 for an electronic musical instrument provided in an operation panel 2 comprises a rib 2b for positioning in a back and forth direction at a predetermined position in a back and forth direction on a rear face of the operation panel 2; a first engaging part 9a and a second engaging part 9c, a keytop 4 fixed on a rear face of the operation panel 2 in such a state that a first engaging part 9a engages with the rib 2b, an engaging part 3a for positioning in a right and left direction at a predetermined position in a right and left direction, and a switch substrate 3 fixed to the operation panel 2 in such a state that the engaging part 3a engages with the second engaging part 9c of the keytop 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a key top switch of an electronic musical instrument provided as various switches on an operation panel of an electronic musical instrument such as an electronic piano.

  FIG. 7 shows an example of a conventional key top switch of an electronic piano. The key top switch 50 is provided on the operation panel 51 as a tone color selection switch, for example. The operation panel 51 is made of an extruded material or the like, and is provided with a large number of key top holes 52 penetrating in the vertical direction, and ribs 53 protruding in the predetermined direction at the back side and extending in the horizontal direction. . The key top switch 50 includes a switch board 54 formed of a printed wiring board, and a large number of key tops 55 supported on the switch board 54 and slightly protruding from the key top holes 52 of the operation panel 51. ing. Each key top 55 is formed of a synthetic resin molded product, and the like. The support portion 56 attached to the switch board 54 in a state of being fitted to the rib 53, the main body portion 57 supported by the support portion 56, It is constituted by. When the key top 55 is attached to the operation panel 51 with the support portion 56 fitted to the rib 53 of the operation panel 51, the key top 55 is positioned at a predetermined position in the front-rear direction with respect to the operation panel 51. Yes. Further, regarding the positioning of the key top 55 in the left-right direction, the upper surface of the support portion 56 is placed on both sides while determining the mounting position by visual observation so that the center of the main body portion 57 is located at the center of the key top hole 52. This is done by attaching the tape 58 to the back surface of the operation panel 51.

  In addition, although not shown in the drawing regarding the positioning of the key top in the left-right direction, a pair of positioning crushing portions protruding in the front-rear direction are provided at predetermined positions in the left-right direction of the rib, and the key top is supported between these positioning crushing portions. What is performed by fitting the parts is also known. These positioning crushing portions are formed by pressing the ribs using a dedicated press mold prepared in advance.

  However, when the left and right positioning of the key top 55 with respect to the operation panel 51 is performed by the double-sided tape 58, the pasting operation must be performed while determining the mounting position for each of the key tops 55. The pasting operation is very complicated, and the manufacturing cost of the key top switch 50 is increased. In addition, since the mounting position of the key top 55 is determined by visual observation, the mounting position may not be determined accurately. Even if the key top 55 is determined accurately, it is difficult to attach the key top 55 accurately. Cannot be obtained, and the quality becomes difficult to stabilize.

  On the other hand, when the positioning of the key top in the left-right direction is performed by the positioning crushing portion provided on the rib of the operation panel, it is technically very difficult to obtain the positioning crushing portion with high accuracy by the press. Therefore, it is costly to produce such an expensive press die only for positioning, and as a result, the manufacturing cost of the key top switch is increased.

  The present invention has been made to solve such a problem, and the key top can be accurately and easily positioned at predetermined positions in the front-rear direction and the left-right direction of the operation panel, and the manufacturing cost can be reduced. An object of the present invention is to provide a key top switch for an electronic musical instrument.

  In order to achieve this object, the invention according to claim 1 is a key top switch of an electronic musical instrument provided in an operation panel, wherein the back of the operation panel has a position for positioning in the front-rear direction at a predetermined position in the front-rear direction. A key top provided with a rib and having first and second engaging portions, with the first engaging portion engaged with the rib, and a left and right direction at a predetermined position in the left and right direction And a switch board fixed to the operation panel in a state in which the engaging portion is engaged with the second engaging portion of the key top.

  In the key top switch of the electronic musical instrument, the key top is attached to the operation panel in a state where the first engagement portion is engaged with the positioning rib in the front-rear direction. Since the positioning rib is provided at a predetermined position in the front-rear direction of the operation panel, the key top can be moved with respect to the operation panel by simply engaging the first engaging portion with such a rib. It is possible to accurately and easily position at a predetermined position. In addition, the switch board is fixed to the operation panel in a state where the second engaging portion of the key top is engaged with the engaging portion for positioning in the left-right direction. Since the engaging portion for positioning is provided at a predetermined position in the left-right direction of the switch board, the key top can be attached to the switch board simply by engaging the second engaging portion with such an engaging portion. Thus, it is possible to accurately and easily position at a predetermined position in the left-right direction with respect to the operation panel. As a result of the above, unlike conventional key top switches, it is not necessary to perform a double-sided tape affixing operation or a rib crushing operation for providing a positioning crushing portion for positioning the key top in the left-right direction. The operation of attaching the key top to the operation panel can be simplified, thereby reducing the manufacturing cost of the key top switch.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a key top switch of an electronic piano to which the present invention is applied. The key top switch 1 is arranged on the operation panel 2 as, for example, a timbre selection switch, and selects a timbre by the operation and displays the selection state. The key top switch 1 includes a switch board 3, a large number of key tops 4 (only one is shown in FIG. 1) attached to the operation panel 2, and LEDs 5 for illuminating each key top 4. Yes.

  The operation panel 2 is made of an extruded aluminum material and has a predetermined cross-sectional shape. As shown in FIG. 2, a plurality of openings 2a (only one is shown) penetrating in the vertical direction are formed at predetermined positions on the operation panel 2 so as to be lined up in the left-right direction. The main body 8 of the top 4 is fitted with a slight gap and slightly protrudes above the operation panel 2. A rib 2b for positioning each key top 4 in the front-rear direction is provided at a predetermined position behind the opening 2a of the operation panel 2 (right side in the figure). The rib 2b extends continuously in the left-right direction, protrudes to the back surface side, has a predetermined taper, and is formed so that its width decreases toward the tip side. In addition, screw mounting portions 2c and 2c that extend in parallel in the left-right direction are provided immediately behind the rib 2b so as to protrude to the back surface side. Further, a substrate support portion 2d extending in the left-right direction is provided on the front side of the opening 2a of the operation panel 2 so as to protrude to the back surface side, and the substrate support portion 2d has a recess opened rearward. 2e is formed.

  The switch board 3 is composed of a printed wiring board, and a tact switch 6 is provided on the surface thereof at a position corresponding to the key top 4. Then, as the key top 4 is pushed, the tact switch 6 is turned on, so that the key top 4 is turned on, and the ON signal is output to a control device (not shown). The tone color or function corresponding to the key top 4 is selected. A number of key top positioning holes 3a (engaging portions) for positioning the key tops 4 in the left-right direction are formed at predetermined positions on the rear side of the tact switch 6 (see FIG. 3). Furthermore, a plurality of attachment holes 3b are formed at intervals in the left-right direction on the rear side of the key top positioning holes 3a. The LED 5 is attached to the upper surface of the switch substrate 3 at a position below the main body 8 of the key top 4. The LED 5 is connected to a control device, and the control state of the control device displays a selection state of a tone color or a function by turning on the one corresponding to the pressed key top 4.

  As shown in FIGS. 4 to 6, each key top 4 includes a main body portion 8 that fits into the opening 2 a of the operation panel 2, and a support portion 9 that supports the main body portion 8 on the switch substrate 3. ing.

  The main body 8 includes an upper cylindrical operation portion 8 a that is pushed when the key top 4 is operated, and a lower cylindrical cover portion 8 b that covers the LEDs 5. The operation portion 8a is made of a translucent or transparent synthetic resin, for example, acrylic, and the other part of the key top 4 is made of a translucent synthetic resin, for example, ABS. It is formed by color molding. Further, an actuator portion 8c that protrudes downward is provided at the front end portion of the operation portion 8a so as to face the tact switch 6 of the switch board 3. This actuator portion 8 c is operated by pressing the tact switch 6 in accordance with the pressing operation of the key top 4. The support portion 9 is connected to the main body portion 8 via a pair of left and right hinges 11 and 11. The key top 4 returns to its original position when the finger is released after the pressing operation due to the elasticity of the hinges 11 and 11. Further, the support portion 9 has an engagement portion 9a (first engagement portion) having an inverted L-shaped cross section that protrudes from the back surface. The vertical portion 9b of the engagement portion 9a is a contact portion 9. It extends in the vertical direction substantially parallel to the vertical direction. In addition, a positioning projection 9c (second engagement portion) is provided on the lower surface of the support portion 9 at the center in the left-right direction. The width of the positioning projection 9c in the left-right direction is set to a predetermined size so that it can be engaged with the key top positioning hole 3a.

  Furthermore, a pair of left and right elastic arm portions 10 and 10 that urge the support portion 9 toward the switch substrate 3 are provided at the upper end portion of the support portion 9. Each elastic arm portion 10 is formed in an L-shaped cross section from a relatively thin horizontal portion 10a extending substantially horizontally from the front surface of the support portion 9 and a panel contact portion 10b extending upward from the tip of the horizontal portion 10a. Yes. Before the key top 4 is attached to the operation panel 2, the upper end of the panel contact portion 10 b is positioned above the upper end of the support portion 9.

  The key top switch 1 configured as described above is assembled as follows. First, in a state where the engaging portions 9a of the support portions 9 of the key tops 4 are engaged with the ribs 2b of the operation panel 2, the main body portions 8 of the key tops 4 are fitted into the corresponding openings 2a of the operation panel 2, respectively. . Thus, by engaging the engaging portion 9a with the rib 2b, the key top 4 can be accurately and easily positioned at a predetermined position in the front-rear direction of the operation panel 2, and the body portion 8 is fitted into the opening 2a. As a result, the key top 4 is roughly positioned in the left-right direction. Next, the switch board 3 is inserted at its front end into the recess 2e of the operation panel 2, and the positioning projections 9c of the key tops 4 are engaged with the key top positioning holes 3a of the corresponding switch boards 3. In this state, a jig (not shown) is used to position the switch board 3 at a predetermined position in the left-right direction with respect to the operation panel 2, and screws 12 are attached to the operation panel 2 through the attachment holes 3b. The switch board 3 is fixed by screwing between the parts 2c and 2c. Thereby, a large number of key tops 4 can be accurately and easily positioned at predetermined positions in the left-right direction at a time. Therefore, unlike the conventional key top switch, the operation of attaching the double-sided tape for positioning the key top in the left-right direction and the crushing work of the ribs for providing the positioning crushing portion are omitted. The key top 4 mounting operation can be simplified, and the manufacturing cost of the key top switch 1 can be reduced.

  Further, when the key top switch 1 is assembled, the panel abutting portion 10b of the elastic arm portion 10 abuts on the operation panel 2, so that the reaction force causes the horizontal portion 10a to bend and the support portion 9 to be connected to the switch board 3 side. Energize to. Therefore, by this urging, the key top 4 is always pressed against the switch board 3 after the key top 4 is attached. Similarly, when the key top switch 1 is assembled, the engaging portion 9a of the support portion 9 is pushed and spread by the tapered rib 2b of the operation panel 2, so that the support portion 9 tends to come out of the rib 2b. Force acts. Therefore, by this action, the key top 4 is always pressed against the switch board 3 after being attached. As described above, the support portion 9 of the key top 4 abuts on the switch board 3 in a state where the urging force from the elastic arm portion 10 and the pressing force from the rib 2b are applied. It is firmly attached to the panel 2. As a result, since the key top 4 does not vibrate with respect to the operation panel 2 due to vibration of sound generated from a speaker (not shown), it is possible to prevent chatter between the two and generation of noise. .

  In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, in the embodiment described, the rib 2b is formed in a tapered shape, but this shape is arbitrary, and for example, it may be a straight shape. Further, the left and right positioning of the key top 4 is performed by engaging the positioning projection 9c of the key top 4 with the key top positioning hole 3a of the switch board 3, but these may be reversed. That is, a convex portion may be provided at a predetermined position of the switch substrate 3 and a concave portion that engages with the convex portion may be provided on the key top 4. Further, the rib 2b is continuous in the left-right direction because the operation panel 2 is made of an extruded material. However, the rib 2b may be provided only at a portion where the key top 4 is attached. In addition, in the embodiment, the present invention is applied to an electronic piano. However, the present invention may be applied to other electronic musical instruments such as an electronic organ. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.

  As described above, according to the key top switch of the electronic musical instrument of the present invention, the key top can be accurately and easily positioned at predetermined positions in the front-rear direction and the left-right direction, and the manufacturing cost can be reduced. Have

It is a partial front view of the key top switch and operation panel of the electronic musical instrument according to the first embodiment of the present invention. It is a partial front view of an operation panel. FIG. 2 is a partial bottom view of FIG. 1. It is a top view of a key top. It is a side view of a key top. It is a front view of a key top. It is a partial front view of the key top switch and operation panel of the conventional electronic musical instrument.

Explanation of symbols

1 Key Top Switch 2 Operation Panel 2b Rib 3 Switch Board 3a Key Top Positioning Hole (engagement part)
4 Key top 9a Engagement part (first engagement part)
9c Positioning protrusion (second engaging portion)

Claims (1)

A key top switch of an electronic musical instrument provided on an operation panel,
On the back surface of the operation panel, a positioning rib in the front-rear direction is provided at a predetermined position in the front-rear direction,
A key top having first and second engaging portions and attached to the operation panel in a state where the first engaging portions are engaged with the ribs;
A switch board that is fixed to the operation panel in a state in which an engaging portion for positioning in the left-right direction is provided at a predetermined position in the left-right direction, and the engaging portion is engaged with the second engaging portion of the key top. When,
A key top switch of an electronic musical instrument characterized by comprising:

Images