JPH0123860B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a needle cleaner device suitable for use in a capacitive video disc player.

Generally speaking, in a capacitive video disc player where the needle contacts the disc, the diamond needle 1 is constantly in contact with the disc 2 during performance, as shown in Figure 1, and the capacitance on the disc is By this detection, tracking signals and information signals engraved on the disk 2 are detected. In this case, the dust adhering to the surface of the disk disk 2 adheres to the tip of the needle 1 as shown by diagonal lines. If this attached dust 3 enters between the disc 2 and the sliding surface of the tip of the needle 1, the tracking signal and information signal will not be detected sufficiently, causing tracking disturbance or deterioration of the information signal. Therefore, a needle cleaner is required to remove the dust 3 attached to the needle 1.

FIGS. 2 and 3 show the positional relationship between the needle and the disc of a conventional general video disc player. Here, a cartridge for driving the diamond needle 1 is housed in a housing-like arm 4. In the current play-off state, the arm 4 is at position A shown in FIG. Simultaneously with the start of play, the arm 4 moves in the radial direction of the disk board 2 as indicated by the arrow, and when it reaches position B, current flows through the lifter coil and the needle 1
falls onto the disc 2, starts playing, and detects information engraved on the disc 2 toward the inner circumference.
When the play-off is made, the arm 4 moves back to the original position A and stops.

Normally, in this type of video disc player, a brush 5 is used to brush dust from below the cartridge at the arm stop position A during the play-off mentioned above.
is installed as shown in FIG. 4, and the lifter coil 6 is installed as shown in FIG. A current is applied to the cartridge for a certain period of time, and rotational force is applied to the magnet 8 attached to the other end of the cantilever 7 of the cartridge. As a result, the needle tip at the tip of the cantilever 7 is lowered onto the brush 5, and at the same time, the brush 5 is mechanically driven to clean the needle tip.

In the conventional needle cleaner device configured as described above, in order to lower the needle tip onto the brush 5 during play-on or play-off, a mechanism is required to apply current to the lifter coil 6 and drive the brush 5 each time. As a result, costs were increasing.

The present invention has been made in view of these points, and it is an object of the present invention to provide a stylus cleaner device for a video disc player that has a simple configuration and can reliably remove dust from the stylus tip every time a performance is performed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the drawings. FIG. 6 shows one embodiment of the present invention, in which the stopping position of the arm 4 and the disk disk 2 are shown.
Four brushes 5, 5... are installed side by side at a lower position where the tip of the tip of the cantilever 7 passes when the arm 4 moves above the disk board 2 especially during play-on. In addition, an iron piece 9 is attached to the other end of the cantilever 7 at a lower position through which the magnet 8 passes.

Therefore, in the video disc player configured as described above, the cantilever 7 moves against the iron piece 9 as the arm 4 moves during play-on or play-off.
When the needle passes over the brush 5, the upper part of the iron piece 9 is magnetized to the north pole by the magnetic field of the magnet 8, as shown in FIG. This state continues for a length l of the iron piece 9, during which time the needle tip is slid into the brush 5, and the dust attached to the needle tip is removed by the brush 5. By appropriately designing the position and length l of this iron piece 9, after the cantilever 7 passes over the brush 5, the needle tip is housed in the arm 4 again.

Although the iron piece 9 is used in the above embodiment, a plate-shaped magnet may be used instead.

As described above, according to the needle cleaner device of the present invention, in a capacitive video disc player, the brush is placed between the stop position of the arm and the mounting position of the disc disc, and at the position where the needle tip passes through at the tip of the cantilever. In addition, a magnetic piece is attached to the passage position of the magnet at the other end of the cantilever to set the passage period of the needle tip brush by setting the length, and when the magnet at the other end of the cantilever passes the magnetic piece, the length of the cantilever tip is set. Because the needle tip passes through the brush, the needle tip slides inside the brush and adheres to the needle tip each time during play-on and play-off with a simple configuration without using a separate micro switch or electromagnet. Dust is reliably removed, and the period during which the needle tip brush passes can be easily and reliably set simply by setting the length of the magnetic piece.

[Brief explanation of drawings]

Fig. 1 is an enlarged perspective view showing the relationship between the stylus tip and the disc disc in a capacitive video disc player, Fig. 2 is a side view of the same, Fig. 3 is a perspective view of the same main part, and Fig. 4 is a conventional FIG. 5 is a partially cutaway plan view for explaining the needle cleaner device, FIG. 5 is a side view of the same, FIG. 6 is a partially cutaway plan view showing the needle cleaner device of the present invention, and FIG. 7 is a side view of the same. 1...Diamond needle, 2...Disk disc, 4...Arm, 5...Brush, 7...Cantilever, 8...
...Magnet, 9...piece of iron.

Claims (1)

[Scope of Claims] 1. In a capacitive video disk player, a brush is placed between the stop position of the arm and the placement position of the disk disk, at a position where the tip of the needle at the tip of the cantilever passes, and a magnet at the other end of the cantilever. Attach a magnetic piece that sets the length of time the needle tip passes through the brush by setting the length, and when the magnet at the other end of the cantilever passes through the magnetic piece, the needle tip at the tip of the cantilever passes through the brush. A needle cleaner device for a video disc player, characterized in that: 2. The needle cleaner device for a video disc player according to claim 1, wherein an iron piece is used as the magnetic piece.