JPS6025752Y2 - record player device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a record player device, and particularly to a structure for preventing vibration of a cabinet thereof.

Generally, a record player device having an automatic performance device is
The inside of the cabinet is hollow and an automatic performance device is installed, but when the inside is hollow, the rigidity of the cabinet decreases, causing problems with vibration characteristics and causing a decline in the playback quality of the record player device. .

Figures 1 and 2 are diagrams showing the structure of the cabinet of a conventional record player device. It is a back view with the bottom plate removed.

In the figure, 1 is the top plate of the cabinet, 2 is the bottom plate of the cabinet, 3 is the reinforcing rib, and 1 and 2 are the cabinet 1.
Configure 0.

4 is a pickup arm, 5 is a turntable, 6 is a motor that rotates the turntable, 7 is a drive mechanism for arm 4, 8 is a power transformer, 9 is the drive mechanism 7 and motor 6
It is an electric circuit for moving the.

The motor 6 and the pickup arm 4 are connected to the upper plate 1.
installed on.

Further, the motor 6, drive mechanism 7, power transformer 8, and electric circuit 9 are housed in a cabinet 10.

The vibration of the cabinet 10 is mainly the vertical vibration of the top plate 1, and the vibration mode is a peripherally fixed membrane vibration mode, as shown in FIG. The aim was to improve vibration characteristics by increasing the rigidity of the

FIG. 4 is a characteristic diagram showing the mechanical impedance of the cabinet 10. Characteristic curve A shows the characteristics without rib reinforcement, and characteristic curve B shows the characteristics with rib reinforcement.

In addition, points p9 and q in the figure each represent a membranous resonance point of the cabinet 10, and the mechanical impedance in the vicinity increases due to rib reinforcement, and the cabinet 1
This shows that the stiffness of 0 is greatly matched.

However, in order to obtain sufficient rigidity to mount an automatic performance device and obtain good acoustic characteristics by reinforcing the ribs, it is necessary to
It is necessary to arrange high ribs over the entire surface of the upper plate of the cabinet, and in order to accommodate the automatic musical instrument and other necessary components within the cabinet, the size of the cabinet cannot be avoided.

Therefore, due to the demand for smaller cabinets, the height of the ribs
Since the number and location of the automatic performance device are limited and sufficient rigidity cannot be obtained, the vibration characteristics are impaired, and this is a major reason why record players equipped with an automatic performance device are not highly evaluated.

This invention was made with the aim of eliminating the drawbacks of the above-mentioned conventional devices, and proposes a cabinet structure with greater rigidity.

FIG. 5 is a sectional view of an embodiment of this invention, in which the bottom plate 2 is fixed to the bottom surface of the motor 6 by fixing means such as screws.

In this way, the top plate 1 and the bottom plate 2 are integrally formed via the motor 6, so that the rigidity of the cabinet 10 is significantly increased and the vibration characteristics are improved.

Characteristic C in FIG. 4 shows the characteristic of this embodiment.

As can be seen from this characteristic C, the resonant frequency at the resonance point r is higher than that of the conventional example characteristic A, and the mechanical impedance at that time is also larger, indicating that the vibration characteristics are greatly improved.

Although the above embodiment shows a structure in which the bottom plate is fixed by directly contacting the bottom surface of the motor, the structure is not limited to this example. , the same effect can be obtained even if the height of the motor and the height of the cabinet cavity do not match.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional record player device, Fig. 2 is a rear view taken from the line ■-■ in Fig. 1 with the bottom plate removed, Fig. 3 is an explanatory diagram of the resonance mode of the top plate, and Fig. 4 is an illustration of the resonance mode of the upper plate. FIG. 5, which is a diagram showing the resonance characteristics of the cabinet, is a sectional view of one embodiment of this invention. In the figure, 1 is a top plate, 2 is a bottom plate, 4 is a pickup arm, 5 is a turntable, 6 is a motor, 7 is a drive mechanism, 8 is a transformer, 9 is an electric circuit, and 10 is a cabinet. Note that the same reference numerals in the figures indicate the same parts.

Claims (2)

[Scope of utility model registration request] (1) A cavity is formed between the upper plate on which the motor for rotationally driving the turntable and the pickup arm are mounted, and the upper plate which is fixed to cover the back side of this upper plate and houses the motor and other items. A record player device having a cabinet comprising a bottom plate, wherein the bottom plate is fixed to the bottom surface of the motor, and the bottom plate and the top plate are integrally connected via the motor. . (2) The record player device according to claim 1, which is registered as a utility model and has a structure in which the bottom plate and the bottom plate of the motor are fixed to each other by interposing a spacer between them.