JPH036950Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a fixing structure for a diaphragm of a music box.

[Prior Art] The diaphragm of a music box is fixed to a frame with screws. Particularly in high-end music boxes that have a large number of vibrating valves, in order to fully utilize the vibration characteristics of the vibrating valves, the diaphragm is securely fixed to the base by welding or soldering, and then the integrated vibration The board and pedestal are fixed to the frame with screws.

Furthermore, in high-grade music boxes in which the pedestal is integrally formed with the frame, the diaphragm is directly fixed to the pedestal with screws.

In both of the above two conventional examples, there are three or more screw-fastening locations, and the screw-fastening intervals are equal intervals with respect to the diaphragm.

However, the method in which the diaphragm is welded to the pedestal and then fixed to the frame with screws has the drawback of poor workability and is not suitable for mass production. However, in the contact area between the pedestal and the diaphragm, the vibration transmission loss of the vibration valve in the high-frequency treble range is large, making it difficult to obtain good sound quality.

[Purpose of the invention] The object of the invention is to provide a diaphragm fixing structure for a music box that is easy to mass-produce and has good sound quality.

[Structure of the invention] The present invention is characterized by a music box diaphragm fixing structure in which a diaphragm on which a large number of vibration valves are formed is fixed to a frame by screws at three or more positions. This is because the interval between the vibrating valves is narrower on the treble range side than on the low range side of the vibration valve.

[Example] In Fig. 1, a cup-shaped barrel 2 is fixed to one corner of a frame 1 of a music box, which houses a full-body movement that serves as a driving source for the music box, and a drive gear that is rotationally driven by this full-speed movement. has been done. A drum 3 is pivotally supported on the frame 1, and is driven by the drive gear based on the accumulated force of the whole body. The base of a diaphragm 4 having vibrating valves (the longer one produces a low sound, the shorter one produces a high sound, and the natural frequency of each valve is set depending on the song) is fixed with screws 9.

As shown in FIG. 2, the diaphragm 4 has a hole 6 formed near the base of the vibrating valve 5 through which the foot of the fixing screw 9 passes, and each vibrating valve 5 that is repelled by the drum 3
The frame is configured to transmit vibrations to the frame 1 through the pedestal portion.

The inner diameter of the hole 6 is formed to be slightly larger than the foot diameter of the fixing screw 9, and the screw 9 can be tightened after adjusting the positional relationship (meshing amount) between the pin provided on the drum 3 and the vibration valve 5. The diaphragm 4 is fixed. The positions where the holes 6 are provided are set such that the distance between them becomes narrower from the bass side A to the treble side B of the vibration valve 5. This is to ensure that high-frequency sounds that are difficult to transmit to frame 1 are transmitted to frame 1.
Frame 1 ensures that the vibration of the high-pitched vibration valve is suppressed by concentrating on the area near the high-pitched vibration valve.
is configured to be transmitted to

Furthermore, in order to reliably transmit the vibration of the vibrating valve 5 to the frame 1, the hole 6 should be formed as close to the vibrating valve 5 as possible from the center of the base of the vibrating plate 4 when viewed in the direction of the vibrating valve. is desirable, and the illustrated example also has this configuration.

Note that 7 is a speed regulating unit for keeping the rotational speed of the drum 3 constant, and 8 is a one-rotation stopper for stopping the rotation of the drum 3 every rotation.

[Effects of the present invention] According to the present invention, by narrowing the interval between the screw positions for fixing the diaphragm to the frame on the high-frequency side of the vibration valve than on the low-frequency side of the vibration valve, the area near the vibration valve in the high-frequency range is concentrated. Since the music box is pressed down to ensure that high-frequency sounds that are difficult to transmit to the frame are transmitted to the frame, the sound quality of the music box can be made good from the low-frequency range to the high-frequency range.

In addition, by intensively pressing the area around the high-frequency vibration valve, we have reduced the transmission loss of the vibration of the high-frequency vibration valve, so welding between the pedestal and the diaphragm is not required, which simplifies the assembly process. .

Of course, the present invention can also be applied to a device in which a diaphragm fixed to a pedestal by welding or the like is screwed to a frame.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG.
The figure is a plan view showing the diaphragm of the music box of the present invention. 1...Frame, 3...Drum, 4...Diaphragm, 5...
vibrating valve.

Claims (1)

[Scope of utility model registration request] In a music box diaphragm fixing structure in which a diaphragm on which a large number of vibrating valves are formed is fixed to a frame by screws at three or more positions, the intervals between the screw-fastening positions are set from the bass side of the vibrating valves. The music box's diaphragm fixed structure is characterized by a narrower treble region.