JP2003150152A - Electric music box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric music box with which anybody can easily play one's favorite music. SOLUTION: The electric music box comprises a plurality of free reeds as sound source elements, a plurality of actuators which drives free ends of the free reeds and an actuator driving instructing means which determines any one of the actuators to be used and instructs for driving timing. Thus, the actuators are driven by the actuator driving instructing means in accordance with desired music information. Moreover, by dispersedly arranging a plurality of actuators on both sides of the arrangement of a plurality of free reeds, relatively large actuators can be applied to the free reeds having narrow widths and the electric music box can be easily realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrically controlled music box, and more particularly to a drive mechanism for the electric music box.

[0002]

2. Description of the Related Art Conventionally, a music box is produced by flipping a comb-like comb vibration valve with a pin of a rotating cylinder, as is well known, and a unique tone color due to the vibration of the comb is preferred. . In addition, as the one that sounds with a tone color similar to a music box due to the vibration of the comb, star-shaped wheels arranged corresponding to the multiple vibration valves of the comb,
There is one in which a perforated sheet with holes perforated according to the scale is selectively rotated, and the vibrating valve is flipped by the claws of a rotating wheel.

[0003]

However, there are many standard songs prepared in the music box in advance, and it is difficult to choose a favorite song because the selection range is narrow. Also, if you try to play your favorite music on the music box, you have to make the cylinder original, which is very expensive and not easy for everyone to enjoy. Also, with a music box that uses a punched sheet, producing a punched sheet is relatively easier than producing a cylinder, but still, it takes time and labor with high precision to produce a punched sheet, and in this sense, it is difficult to produce. Is. In particular, it is important to naturally dampen the vibration valve in order to obtain a unique sound from the comb, and it is necessary to avoid continuously producing the same sound in a short time. Therefore,
When creating a punched sheet or cylinder, it is necessary to arrange the original song for the music box, and musical expertise is also required.

The present invention aims to provide a practical electric music box so that, for example, anyone can easily play a favorite piece of music with his or her own music box.

[0005]

An electric music box according to the present invention comprises a plurality of vibrating valves as sound source elements, and a plurality of actuators which respectively correspond to the plurality of vibrating valves and drive the free ends of the vibrating valves. Actuator drive instructing means for determining any one of the actuators and instructing the determined drive timing of the actuator, wherein the plurality of actuators are arranged in a distributed manner on both sides of the array of the plurality of vibration valves. It is characterized by that. According to this, since the music box music can be automatically played by driving the actuator by the actuator drive instruction means according to the desired music information, the cylinder provided with the pin or the perforated sheet can be specially created. Without it, anyone can play their favorite music with their own music box. Further, since the plurality of actuators are arranged dispersively on both sides of the arrangement of the plurality of vibration valves, it is not necessary to arrange the actuators corresponding to the adjacent vibration valves adjacent to each other, and the lateral size of the actuator vibrates. A relatively large actuator can be applied to a narrow vibration valve without being limited by the lateral size of the valve. Therefore, it is possible to use an actuator of a relatively large size that can easily generate the output required to drive the vibration valve, and an electric music box of this type can be easily realized. The method of playing this electric music box is the conventional performance style, that is, the automatic performance style, the manual rotation style in which the performance advances by the manual rotation of the handle, and the manual performance in which the performance is advanced by key-on operation by the performer like keyboard performance. It can be applied to any playing style.

[0006]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an external perspective view of a music box 10 according to the present invention. The music box 10 is composed of a main body case 1 and a lid body 11. The main body case 1 has an opening at the top, and a lid body 11 having an L-shaped cross section can be opened and closed via a hinge 12 on one side of the opening. It is installed. Inside the main body case 1, a vibration valve unit fixing frame 13 fixed to the bottom surface of the main body case 1, a vibration valve unit 2 attached thereto, and a vibration valve drive unit 3 arranged on the bottom surface of the main body case 1 are stored. The main body case 1
Electronic circuit section A on the inside (shown by a chain line in the figure)
Is provided. A liquid crystal display 11 is provided on the back side of the lid 11.
a is provided, and the liquid crystal display 11a can be used for displaying the score of a music piece to be reproduced. The liquid crystal display 11a may not be provided. Body case 1
A slot hole 7 for inserting a memory stick (trademark) B for supplying music data from the outside is formed on the front surface of the device, and a MIDI hole for inputting and outputting music data of the MIDI standard is formed below the slot hole 7. An input / output pin 8 for interface is provided. It should be noted that, as shown by the dotted line in FIG. 1, in order to simulate a hand-turned music box performance, a handle-type performance advancing means including a hand-turned handle 5, a pulse pattern turntable 4, a pulse pattern detection sensor 6, a note resolution switching switch S, etc. May be provided, which will be described later.

FIG. 2 is an external perspective view showing the vibrating valve unit 2 and the vibrating valve driving portion 3 of the music box 10 shown in FIG. The vibration valve unit 2 has a double-toothed structure including a first comb 20a and a second comb 20b that are parallel to each other, and a common base end portion 21 connected to a base end portion 21a of the first comb 20a, The second comb 20b has a U-shaped cross section formed by connecting the base ends 21b of the second comb 20b.
The common base end portion 21 of the vibration valve unit 2 is fixed to the common base end fixing portion 13a of the vibration valve unit fixing frame 13 with screws 13d or the like. Combs 20a and 2
Reference numeral 0b denotes a metal comb tooth plate that vertically stands down from opposite edges of the common base end portion 21, and each of the plurality of comb teeth provided therein corresponds to the vibration valve 22. That is, the combs 20a and 20b are arranged so that the comb tooth plate surface thereof is perpendicular to the bottom surface of the main body case 1, and the tip (free end) of each vibration valve 22 is downward (bottom surface of the main body case 1). ).

The vibration valve drive unit 3 comprises a plurality of actuators 31 installed in an actuator fixing unit 30 attached to the bottom surface of the main body case 1. Actuator 3
1 is provided corresponding to each of the vibration valves 22 of the combs 20a and 20b, and according to the control of the electronic circuit A,
Each is configured to flip the free end of the corresponding oscillating valve 22, and is arranged such that the vibration direction of the free end is its driving direction. In other words, the actuator 31 has the driving direction on the actuator fixing portion 30 and the comb 2
It is arranged so as to be oriented in a direction perpendicular to 0a and 20b. An inverted U-shaped return spring 32 is attached to each of the plungers of each actuator 31 described later. The return spring 32 is formed as an elastic body by bending the tip ends of a large number of metal members rising from the spring common base end portion 15 fixed to the actuator fixing portion 30 in a comb shape into an inverted U shape. .

The actuator 31 includes a plurality of vibration valves 22.
On each side of each of the combs, that is, on each side of the combs 20a and 20b, they are arranged in rows and in a distributed manner as described below. FIG. 3 is a plan view showing an arrangement example of the actuators 31. In FIG. 3, for convenience, symbols e1 to en are used to distinguish the individual actuators 31, and symbols d1 to dn are used to distinguish the individual vibration valves 22.
, The subscripts 1 to n are the vibration valve 22 and the actuator 31.
Shows the correspondence. For example, the vibration valve d1 is driven by the actuator e1. In FIG. 3, the actuator 31 includes an array on the right side of the first comb 20a (first array) and between the first comb 20a and the second comb 20b (that is, the left side of the first comb 20a or the right side of the second comb 20b). ) Array (second array) and second comb 2
It has a three-column structure with an array (third array) on the left side of 0b. The aforementioned spring common base end portion 15 is also provided corresponding to each array of the actuators 31.

Here, the arrangement of the vibration valve 22 will be briefly described. In FIG. 3, the actuators e1 to e are shown.
The vibration valves d1 to dn corresponding to n are, for example, the vibration valve d1.
Is "C", the vibration valve d2 is "C #", and the vibration valve d3 is
Is "D" ..., the vibration valves d1 to d2, d3,
It is assumed that the pitches are formed such that the pitch increases by semitones in order of dn. In this embodiment, the vibration valve d1
.. to dn are arranged in the combs 20a and 20b so that the pitch increases in order from bottom to top in FIG. As shown in FIG. 2, it seems that all the vibration valves 22 are formed in the same appearance, but the vibration valves 22 have the same width in the valve arrangement direction,
The thickness is made slightly different, that is, each time the pitch is different, the thickness is reduced or formed, or a dimple is formed somewhere in the longitudinal direction of the vibration valve 22, and the size of the dimple is adjusted in each vibration valve. Different scale tones are formed on each vibration valve 22 by forming the vibration valves 22 at different positions or by slightly changing the vibration valve width without changing the arrangement pitch in the valve arrangement direction. The comb 20a is formed in a "missing tooth" structure in which a portion where the vibration valve is not installed is provided at intervals of two jumps of the vibration valve, while the comb 20b is formed.
The vibrating valve 22 is provided only at the portion of the comb 20a that faces the "missing tooth" portion, that is, the vibrating valve 22 is provided at the interval of two jumps. The actuators 31 are appropriately dispersed and arranged so that the actuators corresponding to the adjacent vibration valves 22 are not arranged in the same arrangement. In the example of FIG. 3, in each of the actuators e1 to en, the actuator e1 is arranged in the first arrangement row, the actuator e2 is arranged in the second arrangement row, and the actuator e3 is arranged in the third arrangement row. e4 are arranged in the first arrangement row, and so on, in a first to third arrangement rows corresponding to the arrangement of the vibrating valves 22, and in a dispersive (staggered) arrangement on both sides of the combs 20a and 20b. To be done.

For example, the arrangement of the vibration valves d1, d2, d3 and the corresponding actuators e1, e2, e3 will be described. The vibration valves d1 and d2 are provided in the first comb 20a. Corresponding to d1, the actuator e1 is positioned in the first arrangement so as to flip the vibration valve d1 from the right side in the figure, and corresponding to the vibration valve d2, the actuator e2 flips the vibration valve d2 from the left side in the figure. Are located in the second array. That is, the actuators e1 and e2 are dispersed and arranged in different arrangements on both sides of the vibration valves d1 and d2 arranged adjacent to the comb 20a. Also,
The actuator e3 corresponds to the vibration valve d3 provided in the second comb 20b, and the actuator e3 is arranged from the left side in the drawing to the vibration valve d3.
It is located in the third array on the left side of the comb 20b so as to flip three. The actuators e3 are arranged alternately with the actuators e2 corresponding to the vibrating valves d2 adjacent to each other in pitch (semitone).

Thus, the actuators e1, e2, e
When viewed from the actuator e1, 3 are arranged in a staircase pattern ascending to the left in FIG. Actuator e4, e
Similarly, 5, e6 ... en are sequentially arranged in the first to third arrays. In this way, the actuator 31
By arranging in a plurality of arrangements corresponding to the arrangement of the vibration valves 22 of the combs 20a and 20b, for example, the actuator e4 that is adjacently arranged on the same arrangement line as seen from the actuator e1 is the vibration valve. It is possible to use a relatively large size actuator 31 that can easily generate the output required to drive the vibration valve, since it is arranged at intervals of two with respect to 22, and it is possible to use a narrow width. A drive system that can drive the vibration valve 22 without difficulty can be realized. Therefore, the electric music box can be easily put into practical use.

In FIG. 3, the first comb 20a
Between the first comb 2 and the actuators e2, e5, e8, ...
It is arranged so as to drive only the vibration valves d2, d5, d8 ... In this way, the twin tooth comb 20
The actuator 31 arranged in the middle of the a and the 20b (second array) drives only one of the twin-teeth combs (20a in this example) to simplify the configuration, Easy installation work.

The arrangement of the actuators 31 corresponding to the double-teeth combs 20a and 20b is not limited to the above-mentioned three rows.
It may consist of only two rows (first and second arrangements or first and third arrangements) or four rows (arranged on both sides of each comb 20a, 20b respectively). . In this case as well, it is not necessary to arrange the actuators 31 corresponding to the adjacent vibration valves 22 adjacent to each other, so that the same effect as described above can be obtained. Further, the comb structure is not limited to the double-toothed vibration valve unit, but may be a comb. In this case, the actuators are arranged in a distributed manner (in a two-row configuration) on both sides of the arrangement of the vibration valves, and the mutual spacing between the actuators in the direction of arrangement is
One jump is placed. Further, it may be configured by three or more multi-tooth combs. For example, as an example of a configuration in which four combs are provided, two above-mentioned U-shaped twin-teeth vibration valve units 2 are provided. You may comprise. The twin-teeth vibration valve unit is not limited to the U-shaped one as shown in the present embodiment, and the comb is attached in a planar shape following the common base end portion connecting the combs. It may be formed by The "missing tooth" portion of each of the combs 20a and 20b is not limited to the above-described "missing tooth" structure in which the vibration valve is not provided, and a dummy vibration valve may be provided at the corresponding location. In this case, a vibration valve having the same pitch as that of the vibration valve adjacent to the dummy vibration valve portion may be installed to give an effect of enriching sound by resonance. In addition, not only the dummy vibrating valve but also the original vibrating valve may be provided at the missing tooth portion. In that case, the combs 20a and 20b can be of the same construction, which is convenient. The scale arrangement of the vibration valves in each of the combs 20a and 20b is not limited to that described above, and may be an appropriate arrangement.

Returning to FIG. 2, the actuator fixing portion 30.
Is composed of a single plate-shaped base on which all the actuators 31 are arranged on the same plane, and has an area corresponding to all the vibration valves 22, and is in both the drive direction and the arrangement direction of the actuators 31. Is fixed to a surface parallel to (the bottom surface of the main body case 1 in this embodiment). The mounting surface for fixing the actuator fixing portion 30 is not limited to the horizontal plane, and may be a substantially horizontal plane (for example, an inclination angle of 45 ° or less). Thus, the plurality of actuators 31 installed on the same plane
Are arranged on a mounting surface parallel to both the driving direction and the arranging direction, and the mounting surface is a substantially horizontal surface, whereby the assembling work can be facilitated and the assembling accuracy can be improved. Also, maintenance and inspection work becomes easy. If the actuator 31 is mounted horizontally as shown in FIG. 2, it is possible to secure a uniform driving force for each oscillating valve 22 because it is not affected by gravity due to the disposition in different directions between the arrays.

The vibrating valve unit fixing frame 13 has two leg portions 13b, and the actuator fixing portion 30 is arranged between the both leg portions 13b (one leg portion 13b in FIG. 2).
(Only shown). The above-mentioned common base end fixing portion 13a to which the vibration valve unit 2 is fixed is bridged on both leg portions 13b, and one end thereof has a free end portion which is one leg portion 13b.
It is detachably attached to b with screws 13c, etc.
The other end is rotatably attached to the other leg 13b via the hinge 12. At the time of maintenance or the like, by removing the screw 13c and lifting the common base end portion fixed portion 13a upward, the fixed portion 13 is fixed via the hinge 12.
a can rotate upward together with the vibration valve unit 2, and the array of the actuators 31 on the actuator fixing portion 30 can be exposed. Therefore, the maintenance of the actuator 31 can be easily performed. After the maintenance is completed, the hinge 12 can be obtained by simply lowering the fixing portion 13a.
By virtue of the downward rotation of a predetermined locus via the vibration valve unit 2
Is securely returned to the predetermined position. Therefore, contact position deviation between the actuator 31 and the vibration valve 22 does not occur during reassembly, which is preferable.

The leg portion 1 of the vibrating valve unit fixing frame 13
3b is fixed to the bottom surface of the main body case 1 with a screw or the like. When each vibration valve 22 is repelled by the corresponding actuator 31, its free end vibrates, and the generated vibration causes the comb 2 to move.
It is transmitted from 0a or 20b to the common base end portion 21. The fixed frame 13 joined to the common base end portion 21 serves as a vibration transmission member, and the vibration generated by the vibration valve 22 is transmitted to the main body case 1 through the frame 13 and the main body case 1 resonates. To do. Therefore, a rich resonance effect is obtained when the music box sound corresponding to the flipped vibration valve 22 is produced.

Next, referring to FIG. 4, the actuator 31
The drive control of will be briefly described. FIG. 4 shows an electric circuit A
3 is a schematic block diagram of FIG. Music data external memory 44
Stores music data in a predetermined format such as SMF (standard MIDI file) format, and corresponds to the memory stick B shown in FIG. By operating the preparation switch 45, the music data is transferred from the music data external memory 44 to the format conversion unit 4
Read by 2. The format conversion unit 42
The read MIDI format data is converted into a predetermined data format handled by the music box 10, and the converted data is written in the internal memory 43. The internal memory 43 can store song data for one to a plurality of songs. Further, the format conversion section 42 outputs an end signal each time the conversion of the music data for one music is completed. The control unit 40 specifies the storage area of the corresponding music data in the internal memory 43 according to the end signal, and internally stores it in association with the music number information. Song selection switch 46
Is a switch for selecting the music data desired by the user from the music data stored in the internal memory 43 according to the music number. The control unit 40 stores the music data corresponding to the music number selected by the switch 46 in the internal memory 43.
Read from.

One piece of music data stored in the internal memory 43 has one set (note data) of pitch, touch, and sounding timing data corresponding to one note.
It consists of multiple sets of data for the number of notes for one song. Note that the music data in the music box 10 is as follows for a plurality of notes that are simultaneously sounded in the original music data.
After converting the sounding timing data so that the sounding timings may be slightly shifted, each note is defined by different set data, and the internal memory 4 is provided at different addresses.
3, or each note may be stored in the internal memory 43 at a different address by defining each note with different set data while keeping the same tone generation timing data. The pronunciation timing data is, for example, 24 clocks per quarter note (96 clocks per bar in 4/4 time signature).
(Clock) having a predetermined resolution corresponding to a clock as a time base, and data indicating the time from the beginning of a piece of music to the start of sounding the corresponding note in terms of the number of clocks. However, in one set of note data read at the same read address, the pitch data and the touch data correspond to the current note, but the sounding timing data indicates the sounding timing of the next note. Therefore, prior to the note data corresponding to the first note of the song, a data set consisting of only the sounding timing data indicating the sounding timing of the first note is stored, and at the beginning of the song only the sounding timing data of the first note is stored. Is read. Of course, the format of the sound generation timing data is not limited to this, and may be any other suitable format such as a format corresponding to a time difference between notes.

The playback performance of the electric music box 10 according to this embodiment can be performed in accordance with the internal tempo clock, or can be performed in conjunction with the manual operation of the handwheel 5. When performing according to the internal tempo clock, the control unit 40 counts the elapsed time from the beginning of the music according to a predetermined internal tempo clock, and compares the counted elapsed time data with the sounding timing data in the read data. Then, the read address of the internal memory 43 is incremented according to the coincidence. The note data of each note of the music data is sequentially read from the internal memory 43 in accordance with the progress of the read address. Among the note data read from the internal memory 43, pitch data and touch data are output from the control unit 40 to the drive circuit 41 as signals for controlling the driving of the actuator 31. The drive circuit 41 turns on the actuator 31 corresponding to the given pitch data with strength corresponding to the touch data (turns on the plunger of the actuator 31). In response to this, the actuator 3 turned on
The vibration valve 22 corresponding to 1 is driven, and the music box sound is emitted. As is well known, it is possible to adjust the tempo of reproduction performance by adjusting the speed of the internal tempo clock.

When the hand-turning handle 5 is manually operated, the tempo of the replay performance is set and controlled by the handle-type performance advancing means shown by the dotted line in FIG. The handle type performance advancing means includes a disc-shaped turntable 4 rotatably arranged, a crank-shaped handle 5 attached to the center of the turntable 4 and pulled out of the main body case 1, and a turntable 4.
Magnetic sensor 6 arranged near the outer periphery of the main body case 1
And a changeover switch S disposed below the handle 5 on the side surface of the. A predetermined magnetic pulse pattern is formed on the outer periphery of the turntable 4, and when the handle 5 is rotated,
In response to this, the turntable 4 rotates, and the magnetic sensor 6 outputs a pulse signal corresponding to the rotation direction and the rotation speed of the turntable 4. This pulse signal is used as a clock pulse for setting the reproduction performance tempo. That is, the control unit 40
Counts the elapsed time from the beginning of the music in accordance with this pulse signal, and obtains the same elapsed time data as the aforementioned elapsed time data. Thereafter, similar to the above, based on the comparison between the elapsed time data and the sound generation timing data, the internal memory 43
The read address of is controlled to be stepwise, and the note data is sequentially read. In this case, according to the hand-turning speed of the handle 5,
The playing tempo of the music box is set and controlled. It should be noted that the note resolution changeover switch S is a scale of the performance progress performed for one operation of the handle 5 (for example, 1 rotation, 1/2 rotation, etc.) (for example, 1 for 1 rotation of the handle).
This is for switching between advancing bars, advancing by two bars, etc.). For a detailed example of the control system, refer to Japanese Patent Application No. 2001
No. 284495, so please refer to it if necessary.

Next, an example in which the actuator 31 is composed of an electromagnetic solenoid will be described with reference to FIG.
In the example of FIG. 5 (a), the actuator 31 includes a coil 34 wound in a cylindrical shape, a yoke 35 covering the periphery of the coil 34, and a rod-shaped coil linearly movable inside the coil 34. And a plunger 33. The plunger 33 is a core body (movable iron core) 33a.
And a core head 33b and a core tail 33c. The core head 33b is made of a non-magnetic metal such as brass, and is press-fitted into and integrated with the core body 33a. The corresponding vibration valve 22 is struck by this core head 33b. The core tail 33c is made of resin, and the core body 3
3a through the protrusion provided at the joint with the core body 33a
Attach to. By forming the core tail 33c with resin, it is easy to form the insertion hole 32 'for mounting the return spring 32. In addition, by making the length of the core body 33a in the longitudinal direction and the length of the coil 34 in the longitudinal direction the same, the role of enhancing the driving force efficiency when the electric energy is constant is fulfilled. That is, under the condition that the core body 33a and the coil 34 have the same length in the longitudinal direction, when the mounting hole 32 'of the return spring 32 is directly provided in the core body 33a, the hole 32' is inside the coil 34 when the actuator 31 is turned on. Therefore, the core tail 33c provided with the hole 32 'is formed of a non-magnetic material so as not to be buried. The core body 33a is made of, for example, iron, is made of a ferromagnetic material having a small magnetization characteristic hysteresis, and has a length substantially equal to the axial length of the coil. In the coil non-excited state shown in the figure,
The rear end of the core body 33a (on the side of the core tail 33c) is provided with a return spring 3
The force of 2 causes the coil 34 to project to the opposite side in the plunger driving direction (arrow x). By using a material having a small hysteresis as the core body 33a, it is possible to reduce residual magnetism and ensure high drive response.

When the coil 34 is energized, a magnetic flux is generated, and a thrust force (in the direction of arrow x in the drawing) is generated in a direction to draw the core body 33a into the coil 34, thereby causing the plunger 3 to move.
3 is driven. In response to this, the core head 33b projects and strikes the vibration valve 22 provided forward of the plunger drive direction (arrow x), and the vibration valve 22 vibrates to produce a sound. The yoke 35 is configured so as to cover not only the outer circumference of the coil 34 but also the inner circumference near the opening, thereby positively forming a magnetic path and efficiently obtaining thrust of the plunger 33. be able to. As a modified example of the plunger 33 in the actuator 31 described above,
Both the core head 33b and the core tail 33c may be made of resin. In this case, a header made of a non-magnetic metal is attached to the tip of the core head 33b in order to enhance the rigidity of the drive unit and improve the sound quality. Further, the plunger 33 is the core body 3
It is also possible to provide joining protrusions at both ends of 3a and to provide joining holes corresponding to the joining protrusions in the core head 33b and the core tail 33c so as to be integrally formed with an outsert structure for joining each.

FIG. 5B shows another structural example of the actuator 31. The actuator 31 has two coils 34a
And 34b for covering the outer circumference of the coil 3
It is formed so as to close the end of 4b. The plunger 33 includes a magnetic core body 33a and a non-magnetic core head 33b. A shock absorber spring 33d is provided in the coil 34b at the rear end of the core body 33a.
The collision noise between the rear end of the core body 33a and the yoke end 35a when the plunger 33 returns when the coil 34b operates is reduced. “Core body 33a longitudinal length” <“coil 34
a, 34b "longitudinal length" is maintained so that when the coils 34a and 34b are used so as to be alternately energized, the pushing direction of the plunger 33 (to the left in the figure).
Driving and pulling back (to the right in the figure) can be performed alternately. In this case, the return spring 32 is unnecessary, but it may be provided. FIG. 5C shows a configuration example of still another actuator 31. Coil 34 covered by yoke 35
The plunger 33 provided inside has a head portion 33a made of a permanent magnet, and a plunger rear portion 33 made of resin.
A through hole 32 'for mounting the return spring 32 is provided at the rear end of b. When the coil 34 is energized, the tip portion 33
The magnetic force of a and the magnetic force of the magnetized yoke 35 repel each other, and the plunger 33 is driven.

In the above-described embodiments, the description has been made assuming that the tip of the plunger 33 of the linearly driven actuator 31 directly strikes the corresponding vibration valve 22. In that case, in order to secure the vibration of the valve immediately after the impact, it is necessary to immediately turn off the actuator 31 and immediately return the plunger 33 to the initial position. On the other hand, in the second embodiment described below, the movement of the plunger 33 of the electric actuator 31 is transmitted to the mechanical actuator 50 through the movement conversion mechanism, and the mechanical actuator causes the vibration movement of the vibration valve 22. Hit the vibration valve without disturbing it. FIG. 6 shows a vibration valve unit 2 according to the second embodiment.
FIG. 4 is an external perspective view showing the vibration valve drive unit 3. The vibration valve unit 2 has the same structure as that shown in the above-mentioned embodiment. The vibration valve drive unit 3 in the second embodiment is provided with an electric actuator 31 corresponding to each vibration valve 22 in a dispersive arrangement similar to that shown in the above-mentioned embodiment, and further,
A mechanical actuator 50 is provided corresponding to each electric actuator 31. Electric actuator 31
May be of an electromagnetic solenoid type as shown in FIG.

The mechanical actuator 50 includes a comb 20.
A mechanical actuator holding shaft 53 provided below a, 20b is rotatably attached with the mechanical actuator holding shaft 53 as a rotation axis, and in response to driving of the corresponding electric actuator 31, a corresponding vibration is generated via the mechanical actuator 50. It is configured to flip the free end of valve 22. The mechanical actuator 50 has a plurality of tip portions (four in this embodiment) for driving the free end of the vibration valve 22, for example, in the shape of a hook as a whole, and each tip portion (vibration) The valve striking portion) is formed in a sharpened shape in the direction of rotation. A plate-shaped pressing spring 51 corresponding to each mechanical actuator 50
Is provided. In each of the mechanical actuators 50, a pressing spring receiving portion 52 having a square shape when viewed from the side is provided so as to protrude from the side surface of the mechanical actuator 50 by bonding or integrally forming, and the pressing spring 51 abuts on the spring receiving portion 52. The rotational movement of the mechanical actuator 50 is restricted.

Referring to FIGS. 7 and 8 (a)-(c),
A configuration example of the mechanical actuator 50 will be described. FIG. 7 is a schematic plan view of the vibration valve drive unit 3 as seen from above. Only a part of the vibration valve drive unit 3 is shown for simplification of the description, and the combs 20a and 20b are shown by the cut surfaces of the respective base ends.
8A to 8C are schematic side views showing the operation mode of the mechanical actuator 50. The arrangement positions of the plurality of electric actuators 31 (only the electric actuators e1 to e9 are shown in FIG. 7) and the arrangement of the vibration valves corresponding to each are the same as those described in the first embodiment with reference to FIG. The electric actuators 31 are distributedly arranged on both sides of the combs 20a and 20b.
The detailed description is omitted by using the above description. The mechanical actuators 50 are arranged below the corresponding vibration valves 22 so that the rotational trajectories of the tip portions thereof are orthogonal to the combs 20a and 20b. The distal end of the plunger 33 protruding when the corresponding electric actuator 31 is driven on drives one distal end of the mechanical actuator 50, whereby the mechanical actuator 50 is rotated. As shown in FIG. 8A, the mechanical actuator 50
Among the four tip portions 50a to 50d, the tip portion located below in the non-driving state (the tip portion 50c in FIG. 8A) is located in front of the corresponding linear actuator driving direction of the plunger 33 of the electric actuator 31. It is arranged to be located. The spring receiving portion 52 is the mechanical actuator 50.
On the other hand, the diagonal direction of the spring receiving portion 52 and the cross direction of the mechanical actuator 50 (the rotation center p and the tip portions 50a to 5a-5).
The spring receiving portion 5 is attached so that the direction of connecting 0d) is displaced by a predetermined angle (for example, about 10 ° to 20 °).
The two diagonal directions and the direction connecting the rotation center of the mechanical actuator 50 and the apexes of the tip portions 50a to 50d are formed to form an angle of, for example, about 10 ° to 35 °. The two angle setting conditions are as follows: the vibration width of the vibration valve 22, the rotation center of the mechanical actuator 50, and the tip portions 50a to 50.
Depending on the length of d (radius length), the above condition corresponds to the case where the radius length is 5 to 15 mm. For example, when the radius length is larger, the above condition is mild (allowable range expansion).
become. Further, if the rounded cam-shaped cross actuator is used instead of making the apexes (driving points) of the tip portions 50a to 50d sharp as shown in FIG. 8, the actuator cross direction and the direction toward the central driving point And of course have the same direction. In the non-driving state of the mechanical actuator 50, the spring receiving portion 52 pressed by the pressing spring 51 forms a right angle with the opposing side corresponding to the vibration valve 22,
As shown in FIG. 8A, one tip portion 50a is located at the drive start position (standby position). The angle between the opposing side of the spring receiving portion 52 and the oscillating valve 22 will intersect at 45 degrees if the pressing direction of the pressing spring 51 is inclined from the upper left to the lower right by 45 degrees.

As shown in FIG. 6, the pressing spring 51 corresponding to each mechanical actuator 50 is held by the spring common holding portion 16 together with the return spring 32 of the electric actuator 31. In FIG. 7, the spring common holding portion 16 is provided corresponding to each array of the electric actuators 31 as indicated by reference numerals 16a to 16c. The pressing spring 51 corresponding to each mechanical actuator 50 may extend from the appropriate spring common holding portions 16a to 16c, and in short, the pressing spring 51 may pass through a vacant place between the arrangement of the electric actuators 31. Is extended. Further, as shown in FIG. 7, the spring receiving portion 52 corresponding to each mechanical actuator 50 may be provided on either side of the mechanical actuator 50 as long as it is pressed by the corresponding pressing spring 51. . For example, the mechanical actuator 5 corresponding to the electric actuator e1
The spring receiving portion 52 of 0 is arranged on one side so as to be pressed by the pressing spring 51 extended from the spring common holding portion 16b, while the spring receiving portion 52 of the mechanical actuator 50 corresponding to the electric actuator e2 is It is arranged on the other side surface side so as to be pressed by the pressing spring 51 extending from the spring common holding portion 16a. Further, the shape of the pressing spring 51 may be appropriately modified so that the corresponding spring receiving portion 52 can be pressed without being uniformized. For example, in FIG. 7, the electric actuator e
Spring receiving portion 52 of the mechanical actuator 50 corresponding to 3
The tip shape of the pressing spring 51 extending from the spring common holding portion 16c for pressing is wider than other shapes. As a modified example of the installation of the pressing spring 51, the mechanical actuator 50 corresponding to the electric actuators e3, e6, e9, ... By the pressing spring 51 extending from the pressing spring base part with the member 60 shown in FIG. 7 as the pressing spring base part. The spring receiving portion 52 may be pressed.

The pressing spring 51 and the spring receiving portion 52 serve as a bistable regulating member that regulates the operating state of the mechanical actuator 50 into a stable state, a metastable state, and an unstable state. One linear reciprocating drive makes a stepwise rotation with one quarter of the mechanical actuator 50 as one step. 8 (a)-
The operation mode of the mechanical actuator 50 will be described with reference to FIG. 8C. In the non-driven state of the electric actuator 31 shown in FIG. It is in normal pressure contact downward, and in this state, the mechanical actuator 50 is in a stable state. The stable state shown in FIG. 8A is referred to as a first stable position. Thus, the mechanical actuator 50 obtains this stable state every 90 ° with respect to the rotation direction. On the other hand, in the unstable state, the mechanical actuator 50 is acted upon by the pressing force of the pressing spring 51 to move to the stable state. The four tip portions 50a to 50d of the mechanical actuator 50 operate by switching to three functions of valve striking, stopper, and driving depending on the rotation range.

When the electric actuator 31 is turned on (driven), the tip portion 50c that functions as a drive for the mechanical actuator 50 is pushed by the plunger 33 and the mechanical actuator 50 rotates, and accordingly, functions as a valve striking. The leading end portion 50a starts moving from a predetermined drive start position. The tip portion 50a hits the vibration valve 22, exceeds the vibrating range of the vibration valve 22, and moves approximately 4 times from the first stable position.
At the midpoint of the transition to the adjacent stable state rotated by 5 °, the pressing spring 51 for the mechanical actuator 50 is located.
The stable state transition acting force from is not applied, and the mechanical actuator 50 assumes a metastable state. Figure 8 (b)
In, the tip position of the plunger 33 in this metastable state is indicated by an arrow z. As shown in FIG. 8B, when the mechanical actuator 50 slightly exceeds the metastable state as the plunger 33 continues to be pushed, the mechanical actuator 50 becomes instable and the mechanical actuator 50 becomes unstable.
On the other hand, due to the downward pressing force of the pressing spring 51, the transition acting force acts so as to transit from the first stable position to the next stable position, and the mechanical actuator 50 has the tip portion 50b that functions as a stopper. Rotate until it is located at 50b '. Here, since the tip end portion 50b 'comes into contact with the plunger 33, the rotation of the mechanical actuator 50 is temporarily suppressed, and the mechanical actuator 50 stops moving and waits for the transition to the next stable position. In this state, the striking tip portion 50a reaches the drive end position as shown by the broken line 50a ', and is in a position where it does not hinder the vibration of the vibration valve 22. That is, even if the plunger 33 of the electric actuator 31 is kept on and extended, the striking tip portion 50a does not hinder the vibration of the vibration valve 22. Accordingly, even if the electric pulse width of the electric energy (current × voltage) to the electric actuator 31 does not have to be calculated and taken into consideration, it suffices to prepare an appropriate electric pulse for the continuous hitting of the vibration valve 22. The degree of freedom increases.

When the plunger 33 is pulled back by the OFF operation of the electric actuator 31, the mechanical actuator 50 transits to the second stable position shown in FIG. 8 (c). The stopper tip portion 50b is locked by the plunger 33 until immediately before the plunger 33 returns to the complete return position (plunger position 33 'shown by a dotted line in the figure), but the position of the plunger 33 is set to the position 33'. When it returns to the complete return position, the engagement between the plunger 33 and the stopper tip 50b is released, and the mechanical actuator 50 moves to the second stable position according to the transition acting force of the holding spring 51 to the stable state. After the transition, this stable state is maintained to prepare for the next ON operation of the electric actuator 31. That is, at this time, the tip portion 50d that functions for the next valve striking is positioned at the drive start position. The tip portion 50a that has been functioning for hitting the valve until now moves a little further downward from the drive end position shown by the broken line 50a ′ when the electric actuator 31 is switched off, and is shown in FIG. 8 (c). To reach the position. Next, when the electric actuator 31 is turned on, the valve striking tip portion 50d moves from the drive start position to the drive end position in the same manner as described above, and the vibration valve 22 is driven. It should be noted that the tip portion 50a that had been functioning for valve striking before that moved to below the vibrating valve 22 with the rotation of the mechanical actuator 50, and eventually when functioning again for valve striking as shown in FIG. It returns to the drive start position as shown in a).
Therefore, the trajectory of the return of the tip portion 50a does not hinder the vibration valve 22. In this way, the tip portion 50a that functions as a valve striking member is designed to move back from the drive end position to the drive start position along a locus different from that during drive in response to the OFF operation of the electric actuator 31. A motion conversion mechanism of the mechanical actuator 50 that exhibits a hysteresis characteristic that draws different trajectories at the time of driving and at the time of returning is configured.

The relationship between the transition of the rotary operation state of the mechanical actuator 50 and the drive pulse signal input to the electric actuator 31 will be described with reference to FIGS. 9 (a) and 9 (b). In FIG. 9A, for a given one sound to be pronounced, the corresponding electric actuator 3
When the drive pulse signal is input (ON) to 1, the plunger 33 starts moving with a slight time delay from the rising of the pulse signal, and moves to the completely protruding state at the time indicated by L in the figure. The plunger 33 maintains a completely projecting state while the pulse signal is being input (while it is on) (time indicated by M in the figure), and when the signal disappears (is off), it has a very short time. The pull-back operation by the return spring 32 starts with a delay and is pulled back to the complete return position (time indicated by N in the figure).
At this time, in the case of the electric actuator 31 of FIG. 5B, instead of the return spring 32, the coil 34b may be energized to return the plunger 33.

FIG. 9B is an enlarged view of FIG. 9A showing an example of the rotation angle of the mechanical actuator 50 corresponding to the movement amount of the plunger 33. As described above, one linear reciprocating motion of the plunger 33 corresponds to about 90 ° rotation (1/4 rotation) of the mechanical actuator 50. The rotation of the mechanical actuator 50 is started in response to the start of the movement of the plunger 33 due to the turning on of the drive pulse signal, and the rotation is stopped at the above-mentioned drive end position. At this time, the mechanical actuator 50 is in a position rotated by about 50 ° (for example, about 45 ° to 60 °) from the start of rotation, and the rotation stopped state is maintained here. When the drive pulse signal is turned off, the pulling back of the plunger 33 starts and the plunger 3
When 3 exceeds a predetermined position (q in the figure), the remaining rotation of the mechanical actuator 50 is performed.

As the drive pulse signal, for example, 100
By using the ms width pulse signal, a music box capable of high performance pronunciation is possible. For example, when performing a musical piece at a tempo of 90 quarter notes per minute, 16th notes are about 16
Since it takes 6 ms, even if the pulse signal is 100 ms,
Approximately 66 ms after the start of the pullback operation of the plunger 33
Since there is a margin, the remaining rotation of the mechanical actuator 50 from the standby position (40 ° rotation in the example of FIG. 9) during this period.
Should be done. In this way, when a musical piece is played at a tempo of 90 quarter notes per minute, it is possible to continuously strike the same vibrating valve with a length of 16th notes, that is, to perform continuous same notes of 16th notes. . In the figure, the pulse width adjustable range W is a time region from the time corresponding to the complete projecting position of the plunger 33 to the time of turning off the pulse signal, during which the temporal length of the pulse signal can be arbitrarily adjusted. And can be adjusted within a range of approximately 0 to 150 ms.

According to the configuration including the electric actuator 31 and the mechanical actuator 50 as shown in FIG. 6, even if the ON time of the electric actuator 31 is long, the vibrating valve striking member (tips 50a to 50d) of the vibrating valve 22 is provided. Stable vibration can be secured without disturbing the vibration.
Further, since the locus of the vibration valve striking member (tips 50a to 50d) at the time of valve driving and the locus at the time of returning have different hysteresis characteristics, the vibration valve striking member (tips 50a to 50d).
Stable vibration can be ensured without the movement of the return valve d) returning to the vibration of the vibration valve 22.

As yet another arrangement example of the pressing spring 51,
The pressing spring 51 may be arranged below the electric actuators 31, whereby the mutual spacing in the arrangement direction of the electric actuators 31 can be made wider. This example will be briefly described with reference to FIG. 10. As shown in FIG. 10A, the electric actuators 31 (e1 to e6 in the figure) are arranged in two rows in a distributed manner on both sides of one comb 20. The mechanical common actuator 50 is arranged corresponding to this, and the spring common holding portion 16 that holds the return spring 32 and the pressing spring 51.
Are provided corresponding to the two-row arrangement of the electric actuators 31. As shown in the schematic side view of FIG. 10B, since each electric actuator 31 is mounted on the actuator installation base 17 and a space is formed between the actuator fixing portion 30 and the electric actuator 31, the pressing spring 51 is electrically connected. It can be arranged below the actuator 31.

As a method of playing the music box 10 according to the present invention, for example, a manual performance by a MIDI musical instrument can be performed. To this end, the MIDI performance data input from the MIDI input / output pin 8 shown in FIG. 1 is input to the format conversion section 42 shown in FIG.
Converted to a predetermined format handled by the music box,
The control unit 40 and the drive circuit 4 based on the converted performance data
It suffices to drive and control the actuator 31 in real time via the control unit 1. In this case, it is possible to play the music box 10 by connecting a MIDI musical instrument such as a keyboard with a MIDI output function to the MIDI input / output pin 8 of the music box 10 and performing a keyboard performance operation of the keyboard or the like. When this manual playing style is adopted, the electric music box of the present invention is changed to a form of an electronic musical instrument using a sound source called a music box rather than a music box. Although the control is electronic, the sound source is acoustic, and a large-scale device such as a MIDI-controlled piano is not required, and the acoustic sound source can be enjoyed at low cost. It should be noted that the electronic musical instrument of this manual playing form is not limited to the electronic keyboard musical instrument, and can be realized in any form such as an electronic wind instrument and an electronic harmonica. That is,
It can be used as an acoustic sound source for MIDI controlled musical instruments of any form.

[0038]

As described above, according to the present invention, by disposing a plurality of actuators in a distributed manner on both sides of the arrangement of a plurality of vibration valves, the actuators corresponding to the adjacent vibration valves are adjacent to each other. Since it is not necessary to arrange the actuators in a wide range, the lateral size of the actuator is not limited to the lateral size of the vibrating valve, and a relatively large actuator can be applied to the narrow vibrating valve. Therefore, it is possible to use a relatively large size actuator that can easily generate the output required to drive the vibration valve, and an electric music box of this kind can be easily put into practical use. Further, by arranging the actuators on the mounting surface parallel to both the driving direction and the arranging direction of the plurality of actuators and making the mounting surface substantially horizontal, the assembling work and the maintenance and inspection work can be simplified. Further, the vibration valve unit is configured such that a base end portion of a first valve array including a plurality of vibration valves and a base end portion of a second valve array including a plurality of vibration valves are commonly connected to each other. A configuration in which the actuators are arranged distributively in at least two rows corresponding to the first valve arrangement and the second valve arrangement (in this case, one row for each of the first and second valve arrangements) , Including two rows for one valve arrangement and one or more rows for the other valve arrangement)
It is not necessary to dispose the actuators corresponding to the adjacent vibrating valves adjacently, and the lateral width size of the actuator is not limited to the lateral width size of the vibrating valve, and a relatively large actuator can be applied to the narrow vibrating valve. Therefore, it is possible to use a relatively large size actuator that can easily generate the output required to drive the vibration valve, and an electric music box of this kind can be easily put into practical use. Further, the vibration valve unit is configured by connecting a base end portion of a first valve array including a plurality of vibration valves and a base end portion of a second valve array including a plurality of vibration valves at a common base end portion. The common base end is fixed to the vibration transmitting member fixed to the box, and the vibration is transmitted by the vibration valve, the base end, the vibration transmitting member, and the box in this order. A rich resonance effect can be obtained when the music box sound corresponding to the vibration valve is produced. The mechanical actuator includes a mechanical actuator having a tip that drives the free end of the vibration valve, and an electric actuator that drives the mechanical actuator. The mechanical actuator is driven from the drive start position to the tip starting position in response to the ON operation of the electric actuator. By moving to the end position and moving the tip according to the OFF operation of the electric actuator from the drive end position to the drive start position along a trajectory different from that during driving, a motion conversion mechanism is used. Accordingly, the vibration valve can be appropriately driven, and a practical electric music box can be provided.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment of a music box according to the present invention.

FIG. 2 is a perspective view showing a specific example of a vibration valve unit and a vibration valve driving unit according to the embodiment.

FIG. 3 is a view showing an arrangement example of actuators according to the embodiment.

FIG. 4 is a block diagram showing an example of an electric circuit of a music box according to the present invention.

FIG. 5 is a diagram showing some examples of electromagnetic solenoids usable as electric actuators according to the present invention.

FIG. 6 is a perspective view showing a specific example of a vibration valve unit and a vibration valve drive section according to a second embodiment of the present invention.

FIG. 7 is a schematic plan view of the vibration valve driving unit according to the embodiment as seen from above.

FIG. 8 is a schematic diagram showing an operating state of the mechanical actuator according to the embodiment.

FIG. 9 is a time chart showing an example of a pulse signal for driving the electric actuator according to the embodiment and an operation transition of the mechanical actuator according to the pulse signal.

FIG. 10 is a view showing still another embodiment according to the present invention, in which (a) is a schematic plan view of the comb and the vibration valve driving section as viewed from above, and (b) is a schematic side view thereof.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main body case (box) 2 Vibration valve unit 3 Vibration valve drive part 10 Music box 13 Fixed frame (vibration transmission part) 13a Common base end fixed part (fixed part of common base end) 20a, 20b Comb (first Valve arrangement, second valve arrangement) 21 Common base end portions 21a and 21b Base end portion 22 Vibration valve 31 Actuator (electric actuator) 32 Return spring 33 Plunger 40 Control unit (actuator drive instruction means) 41 Drive circuit 42 Format conversion unit 43 Internal Memory 44 External Memory 50 Mechanical Actuator (Motion Conversion Mechanism) 51 Holding Spring (Motion Conversion Mechanism) 50a-50d Mechanical Actuator Tip 52 Mechanical Actuator Spring Receiver

Claims (10)

[Claims] 1. A plurality of vibrating valves as sound source elements, a plurality of actuators respectively corresponding to the plurality of vibrating valves and driving a free end of the vibrating valve, and any one of the actuators is determined and determined. An electric music box comprising an actuator drive instruction means for instructing a drive timing of an actuator, wherein the plurality of actuators are arranged dispersively on both sides of an arrangement of the plurality of vibration valves. Music box. 2. The plurality of vibration valves are arranged in one or a plurality of rows, and the plurality of actuators are
The electric music box according to claim 1, including at least two rows arranged in a distributed manner corresponding to the arrangement of the vibration valves. 3. A plurality of vibration valves as sound source elements, a plurality of actuators respectively corresponding to the plurality of vibration valves and driving a free end of the vibration valve, and any one of the actuators are determined and determined. An electric music box comprising actuator drive instruction means for instructing a drive timing of an actuator, wherein the plurality of actuators are arranged such that a vibration direction of free ends of the plurality of vibration valves is a driving direction. The electric music box is characterized in that the actuators are arranged on mounting surfaces of the plurality of actuators that are parallel to both the driving direction and the arranging direction, and the mounting surfaces are substantially horizontal planes. 4. A vibrating valve unit comprising a plurality of vibrating valves as sound source elements, comprising a base end portion of a first valve array including a plurality of vibrating valves and a second valve array including a plurality of vibrating valves. A plurality of actuators that are commonly connected to the base end portion, a plurality of actuators that respectively correspond to the vibration valve and drive the free ends of the vibration valve, and one of the actuators is determined, and the determined actuator drive An electric music box including actuator drive instruction means for instructing timing, wherein the plurality of actuators are distributed in at least two rows corresponding to the first valve arrangement and the second valve arrangement. Electric music box that is characterized by being placed mechanically. 5. The electric music box according to claim 4, wherein the vibration valve unit is formed in a U-shaped cross section. 6. An actuator arranged between the first valve arrangement and the second valve arrangement of the vibration valve unit drives either one of the first valve arrangement or the second valve arrangement. The electric music box according to claim 4 or 5, which is characterized in that. 7. A vibrating valve unit comprising a plurality of vibrating valves as sound source elements, comprising: a base end portion of a first valve arrangement including a plurality of vibrating valves and a second valve arrangement including a plurality of vibrating valves. One in which the base end portion is connected at a common base end portion, a plurality of actuators that respectively correspond to the vibration valve and drive the free end of the vibration valve, and one of the actuators is determined and determined. An electric music box comprising actuator drive instruction means for instructing drive timing of an actuator, and a box body in which the vibration valve unit, the actuator, and the drive instruction means are arranged, wherein the common base end portion is the box. An electric music box characterized by being fixed to a vibration transmitting part that is in a fixed relationship with the body, and transmitting vibration in the order of the vibration valve, the base end part, the vibration transmitting part, and the box. 8. The electric music box according to claim 7, wherein a fixed portion of the common base end portion of the vibration transmission portion is disposed so as to be movable with respect to the box body. 9. An electric music box device comprising a plurality of vibrating valves as sound source elements, a mechanical actuator having a tip portion driving a free end of the vibrating valve, and an electric actuator driving the mechanical actuator, The mechanical actuator moves the tip portion from a drive start position to a drive end position in response to an ON operation of the electric actuator, and moves the tip portion in a locus different from that during driving in response to an OFF operation of the electric actuator. An electric music box device having a motion conversion mechanism for moving from a drive end position to the drive start position. 10. The mechanical actuator can be in a stable state, a metastable state, or an unstable state, the mechanical actuator is in a stable state when the tip portion is at the drive start position, and the tip portion is When in the drive end position, the mechanical actuator is in an unstable state and the tip is out of the vibrating range of the vibration valve, and the tip of the mechanical actuator is responsive to the ON operation of the electric actuator. When driving the vibration valve, the mechanical actuator reaches an unstable state after passing from the stable state to the unstable state and the metastable state, and when the electric actuator is turned off, the mechanical actuator moves to the unstable state. From the stable state,
The electric music box according to claim 9, wherein the stable state is maintained to prepare for the next turning on of the electric actuator.