JPS58133668A - Record player - Google Patents

Abstract

PURPOSE:To prevent noise due to mechanical vibration from being introduced to a reproduced output, by coupling a driving shaft with a shaft of a motor directly or indirectly via in bellows-state or a bellows type viscoelastic coupling. CONSTITUTION:The viscoelastic coupling 13 is formed into bellows-state or bellows type with rubber of plate spring, and the torque of the motor 7 is delivered to a drive shaft 5 via the coupling 13. Thus, the vibration of the motor 7 is shut and absorbed in the coupling 13 and not delivered to the driving shaft 5. Even if there is a play between a screw 12 of the shaft 5 and internal screws of a bearing 6, the play is eliminated since the tensile strength or compressing force toward axial direction is exerted with the coupling 13. Thus, the invasion of the mechanical vibration to a linear tracking arm 3 is blocked and the introduction of noise to the reproducing sound is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a record player equipped with a linear tracking arm, and its purpose is to provide a mechanism for preventing mechanical vibration noise from being mixed into the playback output. It is located in Jinto, which offers a variety of record players.

In a conventional record player equipped with a general type track DF/G arm, its geometrical shape causes a large tracking error angle, which may generate distorted sound during playback. The linear tracking arm is designed to compensate for this drawback, and is constructed so that the tracking error angle is zero over the entire range of records and records.

Figure 1 shows an outline of a record player equipped with a linear tracking arm. In the figure, 1 is the main body of the player, 2 is the turntable, and 5 is the main body of the player.
is linear tracking arm, 4 is cartridge, 5F
This is the drive shaft for the linear tossing arm 3, and the bearing for it. FIG. 2 shows a conventional linear tracking arm support structure that is an object of the present invention. In Fig. 2 0), 7d motor, 8 is a reduction pulley fixed to the drive shaft 5, 9 is a wire belt that connects the tape pulley 10 and the reduction pulley, and 11 is a bearing that supports both ends of the drive shaft 50. . Screws 1 and 2 are provided on the surface of the drive shaft 50, and are screwed into screws 12 inside the bearing 6 to which the linear tracking arm'sK is fixed.

Therefore, when the drive shaft 5 rotates, the linear tracking arm 5 moves in the axial direction of the drive shaft 5. FIG. 2 IP) is another example in which the reduction mechanism (8, 9, 10) of FIG. 2 0) is omitted and the drive shaft 5 is directly driven by the motor 7.

By the way, in the conventional structure described above, if the vibration of the shaft 7 is large, or if play occurs between the thread 12 of the drive shaft 5 and the internal thread of the bearing 6, these mechanical vibrations acts on the cartridge 4, causing noise in the reproduced sound and deteriorating the sound quality. The present invention is intended to provide a structure that prevents noise from being mixed in due to such mechanical vibrations.

An embodiment of the invention will be described with reference to FIG.

5 to 12 in Fig. 5 f1) are no different from Fig. 2 0). In the present invention, the provision of the viscoelastic connecting body 15 in the middle of the drive shaft 5 is referred to as image 41. This viscoelastic connection body 15 is formed of a bellows IIK made of rubber or a metal plate, and the rotation of the motor 7 is transmitted to the drive shaft 5 through this viscoelastic connection body 15. Figure 3-
is another embodiment of the present invention in which the drive shaft 5 is directly coupled to the rotating shaft of the motor 7 via the viscoelastic connector 15. Since the present invention has the above configuration, the vibration of the motor 7 is suppressed by the viscosity. It is blocked and absorbed by the elastic connecting body 1s, and is not transmitted to the drive shaft 5.Also, even if play occurs in the relationship between the thread 12 of the drive shaft S and the internal thread of the bearing 6, the p Since tension or compression force in the axial direction is applied, the backlash disappears.Therefore, these mechanical vibrations are prevented from entering the linear tracking arm 5, and the reproduction sound Km is prevented from being mixed in. FIG. 4 is a graph comparing the playback output of the cartridge when a record with silent grooves is played back by the conventional record player shown in FIG. 2 and the record player of the present invention shown in FIG. The reproduction output 6 of the hB conventional product also shows less noise.

As described above, the record player of the present invention is a record player in which a cartridge 4 is attached to the tip of a linear tracking arm S that is screwed onto a drive shaft 5 that rotates once and moves. - Directly or indirectly coupled to the rotating shaft of the motor 7 via the viscoelastic connecting body 1s, and rotational vibrations of the motor and other mechanical vibrations are absorbed by the viscoelastic connecting body 1S. As described above, the reproduction output of the cartridge is excellent and has an excellent effect of overcoming the drawbacks of the conventional record player shown in FIG.

[Brief explanation of drawings]

Figure 120) Perspective view of linear tracking arm, IP
) Schematic diagram of a record player equipped with a linear tracking arm @Figure 2: (A) Plan view of a conventional record player equipped with a linear tracking arm, IP) Partial view of another conventional example Figure S: H) Present invention ←) Partial view of another embodiment of the present invention Figure 4 2 Graph comparing the playback output of the record player 6 of the present invention and the conventional record player 6 [Symbols] 1-- Main body 2・-Turntable, 5-Linear tracking arm% 4... Cartridge, 5-
Drive shaft, 6-bearing, 7...motor, 8-reduction pulley,
9...-wire belt, 10,,--motor pulley, 1
1-・Bearing, 12・・Neji, 13・-Viscoelastic connection body 1 fe-Lfu) η

Claims (1)

[Claims] In a record player that moves by being screwed onto a drive shaft that rotates once, or has a cartridge attached to the tip of an air tracking arm, the front attached moving shaft is connected to the rotation of the motor via an accordion-like or bellows-type viscoelastic connection. A record player characterized in that it is connected directly or indirectly to a shaft.