JPH0743943Y2 - Structure of battery holding part of electronic musical instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a battery case of an electronic musical instrument, in which a part of the inner wall of the battery case is cut out to form a spring so as to prevent rattling and chattering of the held battery. .

(Prior Art) As a structure of a battery case of a conventional electronic musical instrument of this type,
For example, the one described in Japanese Utility Model Publication No. 57-19995 is known. This battery case will be described below with reference to FIG.

In this figure, 1 is an exterior body, which is a resin main body 3
And a keyboard frame 5 made of resin that covers the main body 3 from above. A white key 7 is swingably attached to the keyboard frame 5.

A battery storage section 9 is provided in the main body 3 below the white key 7. The battery housing portion 9 is composed of a recess 11 formed on the lower surface of the main body 3 and a recess 13 provided on the frame 5 so as to face the recess 11. Therefore,
The battery 15 is housed in a space (battery housing) having a circular cross section defined by the recesses 11 and 13.

(Problems to be solved by the invention) However, in such a battery case of a conventional electronic musical instrument, a battery housed in a space having a cross section that is slightly larger than the battery is used in the battery housing portion in a direction such as a spring. Since it is configured to be urged and held by the terminal composed of, and not to be configured to fix the battery so as not to move from the outer peripheral portion,
When the musical sound generating means and the like are fixed to the keyboard frame, the high frequency vibration generated by the generating means is transmitted to the case, and the battery is liable or rattled in the battery storage portion. There was a problem that these were causing noise.

In addition, as a battery case for other electric devices, it is known that a sponge or the like is attached to the inner surface of the case. However, this battery has a similar problem that it deteriorates quickly when the battery is used, and a problem of elastic recovery tends to occur, and it is not effective for rattling, chattering and the like.

(Means for Solving the Problems) Therefore, in the present invention, a support member, an operation portion provided on the support member, a musical sound generating means fixed to the support member, and a support member are formed. In an electronic musical instrument having a concave battery holding portion, a base end is continuous with the inner wall and a tip is a free end by forming a notch or a long groove in a part of the inner wall of the battery holding portion. A pair of elastic pieces that elastically support the battery are formed, and the pair of elastic pieces are arranged side by side with the notch or the long groove sandwiched between the pair of elastic pieces. At the tip of
The above problem is solved by providing a structure of a battery holding portion of an electronic musical instrument in which projections projecting inwardly of the concave battery holding portion are formed so that these projections substantially face each other. That is the purpose.

(Operation) In the structure of the battery holding portion of the electronic musical instrument according to the present invention,
Since the battery holding portion is formed on the supporting member provided with the musical sound generating means, the vibration from the musical sound generating means is transmitted to the battery holding portion. Further, the vibration from the operating portion is also transmitted to the battery holding portion.

This battery holding portion is formed in a concave shape in the support member. Moreover, a pair of elastic pieces is formed by forming a notch or a long groove in a part of the inner wall of the battery holding portion. Each elastic piece is provided with a protrusion projecting inward on its inner surface, and when the battery is stored in the concave battery holding portion, these elastic pieces elastically support the battery. As a result, the battery is always elastically supported not only in the axial direction but also in the radial direction.

Therefore, when harmonic vibrations or other shocking vibrations are transmitted to the battery holder, the elastic pieces absorb these vibrations,
It will be alleviated.

(Embodiment) An embodiment of the structure of the battery holding portion of the electronic musical instrument according to the present invention will be described below with reference to the drawings.

1 to 7 show a first embodiment of the structure of the battery holding portion of the electronic musical instrument according to the present invention.

FIG. 7 shows the overall configuration of the electronic keyboard instrument.

As shown in this figure, the resin frame 31 is fixed to the boss of the lower case 33 of the keyboard instrument by screws 35 and 37. That is, the keyboard instrument has an exterior body including a lower case 33 and an upper case 39 attached to the lower case 33, and further has a frame 31 fixed thereto.

A keyboard unit 43 formed by integrally molding a plurality of keys 41 with resin is attached to the frame 31. That is, the rear end portion 45 of each key 41, which is a common attachment portion to the frame 31, is fixed to the frame 31 by the screw 37, and as a result, the thin hinge portion 47 formed adjacent to the rear end portion 45. The key 41 is provided so as to be movable up and down in FIG.

Further, reference numeral 49 denotes a key-depressing portion of the key 41 (a portion that is pressed by the main body of the key). The upper and lower cases 33, 39 are also made of resin.

Here, on the lower surface of the frame 31, a battery holding portion having a semicircular cross section
51 is formed.

As shown in FIGS. 1 and 5, the battery holding portion 51 includes side walls 53 and 53 that are vertically erected from the horizontal lower surface of the frame 31 and extend in the key arrangement direction, and these side walls 53 and 53. The bottom wall 55, which is a concave curved surface facing downwardly, is formed in a long box shape as a whole.

Here, as shown in detail in FIGS. 2 to 4, a plurality of elastic piece pairs are formed on the bottom wall 55 along the key arrangement direction at predetermined intervals.

As shown in FIG. 3, the elastic piece pair forms three vertical grooves 61, 63, 65 along the circumferential direction of the curved surface of the bottom wall 55, and these vertical grooves 61, 63, 65 are formed. The horizontal groove in the key arrangement direction
It is a series of 67 and 69. These flutes 6
1, 63, 65 and the lateral grooves 67, 69 collectively form a long groove 71. A pair of elastic pieces 73A and 73B are arranged to face each other on the bottom wall 55 curved by the long groove 71. The elastic pieces 73A and 73B are both formed as a cantilever integrally with the bottom wall 55 when the frame 31 is molded. In addition, each elastic piece 73
Protrusion 75 protruding in a triangular shape on the inner surface of the free end of A and 73B
A and 75B are formed respectively. That is, the elastic piece 73
A extends along the circumferential direction of the curved bottom wall 55, its base end is formed continuously with the bottom wall 55, and its tip is a free end. A projection 75A is formed on this free end. Similarly, the elastic piece 73B is also formed so as to extend along the circumferential direction of the curved surface, the base end of which is arranged in the vicinity of the protrusion 75A, and the free end thereof is arranged in the vicinity of the base end of the elastic piece 73A. ing. In this way, these elastic pieces 73A, 73B are provided with a vertical groove between them.
The projections 75A and 75B are arranged side by side with the 63 interposed therebetween, and are spaced apart from each other by approximately 180 degrees in the circumferential direction so as to face each other.

Each of these elastic pieces 73A and 73B has a battery holding portion 51 having a concave battery.
When the battery is housed in the battery, the opposing protrusions 75A and 75B abut the outer peripheral surface of the battery and elastically support the same.

As shown in FIGS. 1 and 5, a large number of circular holes 81 (below each key 41) are formed in the horizontal portion of the frame 31 along the key arrangement direction. On the lower surface, hook-shaped hooks 83 are formed on the front side of each circular hole 81, projecting downward, and having their lower ends bent backward. On the side wall (rib) 53 of the battery holding portion 51 formed on the lower surface of the frame 31 on the rear side of these circular holes 81, a spring 85 curved in a U shape is formed so as to face each hook 83. Numeral 87 indicates a positioning pin projecting in a direction perpendicular to the side wall 53.

As shown in FIGS. 6 and 7, the hook 83 and the spring 85 are
A printed circuit board 91 made of plastic or the like is held substantially horizontally between and. The spring 85 constantly urges the printed circuit board 91 against the hook 83 in the horizontal direction. On the upper surface of the printed circuit board 91, fixed contacts and the like that form a key switch are formed by printing.

A sheet member 93 made of rubber having a predetermined thickness is sandwiched between the printed board 91 and the horizontal portion of the frame 31. A part of the sheet-shaped member 93 is bulged upward in a bowl shape to form a movable contact 95 of the key switch. The movable contact 95 is formed in each circular hole 81 of the frame 31.
It is arranged so as to project upward from. Moving contact
95 is made of conductive rubber and is arranged facing the fixed contact
When it is pressed by the actuator of 41, it elastically deforms downward and contacts the fixed contact to turn on the key switch. Reference numeral 97 is a spacer boss for the printed circuit board 91.

In FIGS. 1 and 7, a pair of slits 103 are formed in the front side of the circular hole 81 of the frame 31 so that a guide 101 protruding from the key body portion (key pressing portion) 49 and protrudingly inserted therein is loosely inserted. . The slit 103 is formed not only over a predetermined length in the horizontal portion of the frame 31, but also over the vertical bending portion that is continuous with the horizontal portion and extends for a predetermined length in the vertical direction. . The lower ends of the pair of guides 101 are bent so as to project toward the rear side of the key body 49 by a predetermined length. This hook-shaped horizontal piece is set to have a length that is substantially the same as or slightly shorter than the length of the horizontal portion of the slit 103.

A pair of rectangular holes 105 are formed vertically through the horizontal portion of the frame 31 behind the slits 103 and between the circular holes 81.

A pair of projections 107 formed by projecting a part of the upper surface of the sheet-shaped member 93 upward is inserted into each of these rectangular holes 105, and the upper ends of these projections are provided at a predetermined height of the frame 31. It projects from the top surface. That is, each key 41
On the other hand, each pair of protrusions 107 has an upper end protruding above the rectangular hole 105 and serves as a lower limit stopper of the key 41.

Reference numeral 109 is a single ridge formed on the front end side portion of the lower surface of the sheet-like member 93 so as to extend in the key arrangement direction.

The ridge 109 is formed on one end side of the sheet-shaped member 93,
As a result of the other end side portion of the sheet-shaped member 93 being pinched by the printed circuit board 91, the one end side portion that is the formation portion of the protrusion 109 is elastically swingable in the vertical direction with the pinching end portion as a fulcrum. Supported by the public.

That is, this ridge forming portion has a so-called one-way valve function, and the horizontal piece of the guide 101 allows the horizontal slit 103 to be inserted only from the upper side to the lower side of the frame 31 and prevents the slippage in the opposite direction. Is what you are doing. This ridge 109 is provided so that the bent lower end of the guide 101 can come into contact with it, and also acts as an upper limit stopper of the key 41.

Further, as shown in FIG. 5, a circuit portion 111 of the musical sound generating means is attached to the lower surface of the frame 31 on the side of the battery holding portion 51. The musical sound generating means is composed of a speaker and the like in addition to the circuit section 111.

The operation of this embodiment will be described.

When the keyboard unit 43 is attached to the frame 31 and the key pressing portion 49 is pressed, the horizontal thin plate piece of the thin hinge portion 47 bends downward, so that the key pressing portion 49 swings downward with the fixed portion 45 as a fulcrum. Move.

When the key-depressing portion 49 descends, it comes into contact with the movable contact 95 to be first deformed by pressing, and the key switch is turned on. A predetermined musical sound is generated by the musical sound generating means.
Further, when the key 41 descends, a part of the key body 49 is projected.
, And its descent is stopped.

Then, when the pressing is released, the key pressing portion 49 rises due to the elastic restoring force of the horizontal thin plate piece of the thin hinge portion 47 and the guide 10
The bent portion of 1 comes into contact with the ridge (upper limit stopper) 109 to return to the predetermined position.

Here, the battery that supplies power to the tone generation circuit 111 and the like is held by the battery holding unit 51. At this time, the protrusions 75A and 75B of the elastic pieces 73A and 73B are in contact with the outer peripheral surface of the battery. That is, the battery is elastically supported by the elastic pieces 73A and 73B.

Therefore, when the key switch is turned on, the circuit section 111 of the tone generating means is
When harmonic vibrations are transmitted to the battery holding portion 51 from the above, the elastic pieces 73A and 73B absorb and reduce the vibrations and prevent the vibrations from being directly transmitted to the battery. This is the prevention of so-called chattering. It also prevents noise from occurring.

Further, even when a large external force is applied when the keyboard musical instrument is transported or played, the elastic pieces 73A and 73B absorb the external force, and the battery does not come off or rattling. The battery is always kept in a predetermined state.

In addition, it goes without saying that in each of the above-described embodiments, the operator section is not limited to a key, but a push button of a hand percussion or the like can be considered.

(Effect) As described above, according to the present invention, the battery is elastically urged not only in the axial direction but also in the radial direction by a predetermined force, which causes harmonic vibration and other The buffering action also works against shocking vibrations. That is, it is possible to prevent rattling, chattering, and noise generation without applying harmonics or strong force to the battery.

[Brief description of drawings]

1 is a perspective view showing a back side of a frame according to a first embodiment of a structure of a battery holding portion of an electronic musical instrument of the present invention, and FIG. 2 is a plan view showing a back side of the frame according to the first embodiment, FIG. 3 is an enlarged plan view showing a part of the bottom wall of the battery holding portion according to the first embodiment, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, and FIG. FIG. 6 is a perspective view showing the back side of the frame according to the embodiment, FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5, and FIG. 7 is a longitudinal sectional view showing the electronic musical instrument according to the first embodiment. FIG. 1 is a sectional view showing a battery case of a conventional electronic musical instrument. 31 …… frame, 41 …… key (operator part), 51 …… battery holding part, 55 …… bottom wall, 71 …… long groove, 73A, 73B …… elastic piece,
75A, 75B ... Protrusion, 111 ... Music sound generation circuit section.

Claims (1)

[Scope of utility model registration request] 1. An electronic device comprising a support member, an operating portion provided on the support member, a musical sound generating means fixed to the support member, and a concave battery holding portion formed on the support member. In the musical instrument, by forming a notch or a long groove in a part of the inner wall of the battery holder, the base end is continuous with the inner wall and the tip becomes a free end, and a pair of elastic pieces for elastically supporting the battery is provided. The pair of elastic pieces are formed side by side, and the pair of elastic pieces are arranged side by side with the notch or the long groove sandwiched between the pair of elastic pieces. A structure of a battery holding portion of an electronic musical instrument, characterized in that projections projecting toward one side are formed so that the projections substantially face each other.