JPS5894105A - Cleaner device of stylus for video disk player - Google Patents

Abstract

PURPOSE:To certainly remove dust at the pointed end of the stylus at every play with a simple constitution, by installing a brush to a location where the stylus at the end of the cantilever passes and a magnetic piece to another location where the magnet at the other end passes. CONSTITUTION:In a video disk player of the electrostatic capacity system, a brush 5 is installed to a location between the stopping location a of an arm 4 and the putting location of a disk 2 and where the stylus at the end of a cantilever 7 passes, and a magnetic piece 9, such as iron piece, etc., is fitted to a location where a magnet at the other end of the cantilever 7 passes. When the cantilever 7 passes over the iron piece at the time of play-on or play-off, for example, the upper part of the iron piece 9 is magnetized by the magnetic filed of the magnet 8, the cantilever 7 is rotated, and the stylus is lowered upon the brush 5. This condition continues for the length (l) of the iron piece 9, and the stylus is brushed by the brush 5 during this period, and thus, dust adhering to the pointed end of stylus is removed by the brush 5.

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 type video disc player in which the stylus contacts the disc, the diamond stylus 1 is in constant contact with the disc 2 during play, as shown in Figure 1, and the capacitance on the disc is By this detection, the tracking signal and information signal engraved on the disk 2 are detected.

In this case, dust adhering to the surface of the 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 stylus 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 video disc player. Diamond needle 1 here
A cartridge for driving the 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 disc 2 as indicated by the arrow, and detects information engraved on the disc 2 toward B.

When the play-off is started, arm 4 moves back to the original position A and stops.

Usually, in this type of video disc player, a brush 5 for brushing dust is installed below the cartridge at arm stop position A during play-off, as shown in FIG. Immediately before the arm 4 is driven by A or immediately after the arm 4 returns to position A during play-off, a current is applied to the lifter coil 6 for a certain period of time as shown in FIG. Rotational force is applied to the magnet 8.

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. This resulted in an increase in costs.

SUMMARY OF THE INVENTION The present invention has been devised in view of the above-mentioned problems, and it is an object of the present invention to provide a stylus cleaner device for a video disc player, which has a simple structure 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 explained below according to the embodiments shown in the drawings. 6th
The figure shows one embodiment of the present invention, in which the arm 4 is positioned midway between the stop position and the disk disk 2 mounting position.
In particular, four brushes 5, 5, etc. are installed side by side at the lower position where the tip of the tip of the cantilever 7 passes when the arm 4 moves above the disk 2 during play-on, and An iron piece 9 is attached at a lower position through which the magnet 8 passes.

Therefore, in a video disc player configured as described above, the cantilever 7 is turned off during play-on or play-off.
When the arm 4 moves and passes over the iron piece 9, 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. be descended above. This state lasts only for the length L of the iron piece 9, and during this period the needle tip touches the brush 5.
The bluff 5 removes dust that has been slid inside and adhered to the needle tip. By appropriately designing the position and length k 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 at the tip of the cantilever passes. Also, since a magnetic piece is attached to the other end of the cantilever where the magnet passes, the needle tip slides inside the brush each time during play-on and play-off, ensuring that dust attached to the needle tip is removed. .

[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 illustrating the needle cleaner device, FIG. 5 is a side view thereof, FIG. 6 is a two-part cutaway plan view showing the needle cleaner device of the present invention, and FIG. 7 is a side view thereof. 1... Diamond needle, 2... Disc disc, 4... Arm, 5... Brush, 7... Cantilever,
8... Magnet, 9... Iron piece. Agent Patent Attorney Aihiko Fukushi 2 Figure 1 44 θ 2 212'l Figure 3 Figure 7 Figure 6

Claims (1)

[Claims] L In a capacitive video disc player,
A needle cleaner for a video disc player comprising a brush installed at a position at the tip of the cantilever where the needle passes, and a magnetic piece at the position where the magnet passes at the other end of the cantilever, midway between the stop position of the arm and the position where the disc is placed. Device. 2. A needle cleaner device for a patent cuplayer, characterized in that an iron piece is used as the magnetic piece.