JPH056563Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application and purpose of the invention) The invention relates to a linear tracking player, and its purpose is to create an extremely simple and novel return mechanism and support mechanism for the tone arm. It is an object of the present invention to provide a linear tracking type player which is realized by the structure and whose cost is reduced.

(Structure of the idea) The present invention will be explained below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In the figure, 1 is a player body, and a turntable 2 on which a disc D can be placed is disposed approximately in the center thereof. Further, an operating section 3 including a power switch, a rotation speed changeover switch, etc. is provided at the end of the front surface of the player main body 1.

Next, reference numeral 4 denotes a cover which can be freely opened and closed, which is attached to the player body 1 via a hinge 5, and a linear tracking mechanism as described below is disposed on the inner surface of the cover.

That is, the shaft support portion 6 is fixed near the lower end of the inner surface of the cover 4, and the shaft support portion 6
A round bar-shaped shaft 7 extends from the side end of the hinge 5 in the direction of one of the hinges 5 so as to descend by a slight angle from the horizontal position. And shaft 7
is covered with a tone arm support portion 8 having a structure as shown in FIG. 2 in detail. The tone arm support portion 8 includes a pair of substantially semi-cylindrical sleeves 8a disposed to surround the shaft 7, and is interposed between a groove on the inner surface of these sleeves 8a and an outer peripheral surface of the shaft 7. These balls 8b are connected to the shaft 7.
Since the tone arm support portion 8 is housed in vertical rows along the length of the shaft 7 by an amount corresponding to the length of the sleeve 8a, the tone arm support portion 8 can smoothly and linearly move between the stoppers 7a along the length of the shaft 7. It is now possible to move to Note that the sleeve 8a is integrated by screwing or the like at both ends thereof.

Next, reference numeral 9 indicates an arm main body constituting the tone arm T, and this arm main body 9 is fixed to the tone arm support portion 8 in a direction perpendicular to the shaft 7. Further, a cartridge 10 is attached to the tip of the arm body 9, and a stylus 10a is provided to protrude in the direction of the disk D.

As shown in FIG. 4, the shaft support part 6 and the base end of the arm body 9 are electrically connected by a printed film 11, which is a plastic film printed with copper foil or the like, and is relatively wide. The end portion 11a formed at the end portion 11a is housed within the shaft support portion 6 and is used for connection to an amplifier, etc., and the other end portion 11b is housed within the base end portion of the arm body 9 and is connected to a terminal within the cartridge 10. They are designed to be used for connection with each other.

Next, as shown in FIG. 3 in detail, a first magnet 12 is provided on the inner surface of the cover 4 at a position corresponding to the cartridge 10 of the tone arm T in the restored state. A magnetically conductive rail 13 made of a magnetic material is disposed on the moving path of the cartridge 10. On the other hand, a second magnet 14 is fixed to the back surface of the cartridge 10, and its magnetization direction is set such that the side facing the magnetically conductive rail 13 is the south pole, as shown in FIG. 3, for example. Here, the first magnet 12 may be either a permanent magnet or an electromagnet, but in the case of a permanent magnet, by reversing its position, and in the case of an electromagnet, by reversing the current direction, the third magnet 12
The structure is such that the polarity is reversed as shown in Figures A and B.

In FIGS. 1 and 2, reference numeral 15 indicates an interlock band whose both ends are fixed to the inner surface of the cover 4, and although it does not come into contact with the arm body 9 of the tone arm T during performance, for example, This is for suspending the arm body 9 and holding it together with the cover 4 in case the cover 4 is opened by mistake.

To use this, first open the cover 4 and set the disk D, then open the tone arm support part 8.
is moved to the tip of the shaft 7 by the weight of the tone arm T and is stopped by the stopper 7a, so that the cartridge 10 is in the position shown by the solid line in FIG. At this time, the position of the stylus 10a is set so that it matches the outermost circumference of the sound groove of the disc D when the cover 4 is closed. Furthermore,
When the first magnet 12 is magnetized in the direction shown in FIG. It is attracted to the magnetically conductive rail 13 side and enters a standby state.

Next, during performance, by reversing the magnetization direction of the first magnet 12 as shown in FIG. The magnet 14 repulses this, and the repulsive force is applied to the cartridge 10 and the stylus 10a.
is added as stylus pressure. During this time, the stylus 10a
The tone arm T accurately traces the sound groove of the disk D, and the tone arm T moves linearly along the shaft 7 and the magnetically conductive rail 13. In addition, during the movement of the tone arm T, the print film 11 is bent as shown by solid lines and imaginary lines in FIG. 1, and its restoring force pushes the tone arm T toward the tip of the shaft 7. Therefore, it is expected that the print film 11 will function as an inside focus canceller.

Note that the first magnet 12 and the second magnet 14 may be provided on the base end side of the tone arm T, and in that case, the cartridge 1 is held by the attraction force between the magnets.
0 can be played by lowering it toward the disk side, and the cartridge 10 can be made to stand by on the cover 4 side by the same repulsive force.

(Effects of the invention) As described below, according to the invention, a linear shaft whose tip is slightly lowered from the horizontal position is fixed to the inner surface of a cover attached to the player body so as to be openable and closable. A tone arm that can move linearly along the shaft is attached to the shaft, and a stylus attached to the tone arm that moves linearly with the cover closed is used to tune the sound groove of the disc on the player body. Since the tone arm is configured to return to the tip of the shaft by its own weight when the cover is opened, the tone arm can be automatically returned to standby at the same time as the cover is opened. , there is no need to provide a complicated return mechanism for the tone arm as in the past, and combined with a simple stylus pressure applying mechanism, the structure is extremely simple, which has the advantage of reducing costs.

In addition, in the present invention, a first magnet whose polarity can be freely reversed is provided inside the cover, and a second magnet is provided through a magnetically conductive rail.
The repulsion and attraction forces of these magnets are used, and when the opposing surfaces of both magnets have different polarities, the attraction action is used to set the standby state, so even when external vibrations are applied, it is reliable. The device can be kept in standby mode to prevent malfunctions and damage to the stylus.

On the other hand, when the opposing faces of the magnets are of the same polarity, the repulsive force between them can be utilized during playing to act as stylus pressure, allowing the grooves to be traced accurately.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention. Figure 1 is a perspective view with the cover open, Figure 2 is an enlarged sectional view taken along line A-A in Figure 1, and Figures 3 A and 3 are in operation. FIG. 4 is a perspective view of the print film. 1... Player body, 4... Cover, 7... Shaft, 10a... Stylus, D... Disc, T... Tone arm.

Claims (1)

[Scope of utility model registration request] A linear shaft 7 whose tip is slightly lowered from the horizontal position is fixed to the inner surface of a cover 4 attached to the player body 1 so as to be openable and closable, and the shaft 7 can be moved linearly along this shaft 7. The tone arm T is attached to the shaft 7, and the cover 4 is attached to the shaft 7.
A first magnet 12 whose polarity can be freely reversed is provided inside the shaft 7, and a second magnet 14 is provided on the side of the cartridge 10 having the stylus 10a via a magnetically conductive rail 13 provided parallel to the shaft 7. With the cover 4 closed, a stylus 10a attached to a tone arm T that moves linearly traces the sound groove of the disc on the player body 1 using the magnetic force of the first and second magnets, and A linear tracking type player characterized in that the tone arm T is configured to return to the tip of the shaft 7 by its own weight with the cover 4 open.