JPH0437295Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pick-up needle cleaning device suitable for use in a capacitive video disc player.

(Prior Art) In general, in a capacitive video disc player in which a pick-up needle is in contact with the disk, the pick-up needle a is in constant contact with the disk b during playback, as shown in FIG.
By detecting the capacitance on disk b
It detects the tracking signal and information signal engraved on the top. At this time, the dust c adhering to the surface of the disk b adheres to the tip of the pick-up needle a, as shown by diagonal lines. This attached dust c is mainly a mixture of resins such as vinyl chloride and vinyl acetate that form the disc b, and residues such as plasticizers and silicone oil used as a mold release agent when manufacturing the disc. It has insulating properties and adheres to the needle tip due to its moderate viscosity.

If this dust c enters between the disk b and the sliding contact surface of the tip of the pickup needle a, the tracking signal and the information signal will not be detected sufficiently, causing tracking disturbance and deterioration of the information signal. Therefore, in such a player, it is necessary to remove the dust c adhering to the needle tip with a brush or the like, and various needle cleaner devices for this purpose have been proposed.

(Problems to be Solved by the Invention) Incidentally, in the needle cleaner devices that have been proposed up to now, a relatively hard and one type of material, such as pig hair, has been used as the cleaner brush.
For this reason, only the tip of the pick-up needle can be cleaned, and there is a problem in that dust is not sufficiently removed from the portion away from the sliding surface.

The present invention has been developed in view of the above-mentioned circumstances, and its purpose is to provide a pick-up needle cleaning device that can reliably remove dust attached to areas remote from the sliding surface.

(Means for Solving the Problem) In order to solve the above problem, the pick-up needle cleaning device of the present invention has a brush-like needle cleaner between the stop position of the arm that drives the pick-up needle and the mounting position on the disk. In the capacitive video disc player, the needle cleaner is formed by flocking each region with at least two types of materials, a relatively hard material and a relatively soft material, and the needle cleaner The needle cleaner is rotatably provided by a driving means with the needle axis direction of the needle as the rotation axis, and during cleaning, by rotationally driving by the driving means of the needle cleaner,
The needle cleaner is configured to slide and brush the needle tip of the pick-up needle relative to the moving direction of the needle tip from an obliquely lateral direction.

(Function) The relatively hard cleaner material removes dust attached to the sliding surface of the tip of the pick-up needle, and
The relatively soft cleaner material wraps around the pick-up needle to remove dust attached to a portion of the pick-up needle away from the sliding surface. During this cleaning, the needle cleaner is rotated by the driving means with the needle axis direction of the pick-up needle as the rotation axis, so that the pick-up needle is slid and brushed from an obliquely lateral direction with respect to the direction of movement of the needle cleaner.

(Embodiment) FIG. 1 shows a brush 1 of a pick-up needle cleaning device according to the present invention.

The brush 1 is formed by disposing a second cleaner part 3 made of a relatively hard material, such as pig hair, around a first cleaner part 2 made of a relatively soft material, such as felt. There is.

FIG. 2 shows a pick-up needle cleaning device using the brush 1 described above.

Stop position D of the arm 4 equipped with a cartridge (not shown) for driving the pick-up needle 6
The brush 1 is provided at a lower position between the pick-up needle 6 attached to the tip of the cantilever 5 and a mounting position A on the disk (not shown). This brush 1 is rotatably provided in a direction P in FIG. 2 by a drive motor 7 serving as a drive means. That is, it is rotatably provided around the needle shaft R of the pick-up needle 6 as a rotation axis.

In addition, a magnet 8 is attached to the base end of the cantilever 5.
is attached, and an iron piece 9 is provided at a lower position through which the magnet 8 passes.

In the above configuration, when the pick-up needle 6 passes over the upper surface of the brush 1, the magnet 8 attached to the base end of the cantilever 5 is attracted to the iron piece 9, the cantilever 5 is lowered, and the pick-up needle 6 is placed on the brush 1. Descend. Then, while the magnet 8 is attracted to the iron piece 9, the pick-up needle 6 slides on the brush 1. When the magnet 8 separates from the iron piece 9, the cantilever 5 rises again and the pick-up needle 6 rises from the upper surface of the brush 1.

In other words, the pick-up hand 6 moves when replaying.
In order to move from the mounting position A on the disk to the stop position D, it passes through the path A-B-C-D shown by the dashed line in FIG. 2, and slides on the brush 1 between B and C. It turns out. Furthermore, at the start of play, the player moves to the disc mounting position A by passing through a route DCB-A that is opposite to the above-mentioned route.

At this time, the sliding surface of the tip of the pick-up needle 6 is cleaned by the relatively hard second cleaner part 3 of the brush 1, and the sliding surface of the pick-up needle 6 is cleaned by the comparatively soft first cleaner part 3.
The area away from the sliding surface is cleaned by wrapping around the needle tip. Also, during replay, when the pick-up needle 6 comes to the C position on the brush 1, the brush 1 is rotated in the P direction by the drive motor 7,
At the start of play, when the pick-up needle 6 reaches position B on the brush 1, the drive motor 7 moves the brush 1
is rotated in the P direction. Therefore, the needle tip of the pick-up needle 6 is slid and brushed from diagonally horizontally with respect to the moving direction due to the relative movement between the moving direction of the pick-up needle 6 itself and the rotating direction P of the brush 1 itself. become. FIG. 4 shows the shape of the bottom surface of the pick-up needle 6 (ie, stylus) with dust 10 etc. attached thereto and the cleaning direction (vector representation) of the brush 1. In the figure, the symbol Q indicates the rotation vector of the brush 1, the diagonally shaded portion indicated by the symbol E indicates the sliding direction vector of the brush 1 with respect to the pick-up needle 6, and the diagonally shaded portion indicated with the symbol F indicates the sliding direction of the brush 1 with respect to the pick-up needle 6. It is a vector. Further, the reference numeral 6a is an electrode portion.

In this way, the relative movement between the moving direction of the pick-up needle 6 itself and the rotation direction P of the brush 1 itself effectively removes foreign matter such as dust 10 that has wrapped around and adhered to the side surface of the pick-up needle 6 near the electrode portion 6a. It is something that can be removed.

(Effect of the invention) The pick-up needle cleaning device of the invention has the following features:
A configuration in which a brush is formed by flocking at least two types of materials, a relatively hard material and a relatively soft material, in each area, and is rotatable by a driving means with the needle axis direction of the pick-up needle as the rotation axis. Therefore, a wide range of the tip of the pick-up needle can be cleaned using a relatively hard brush and a relatively soft brush.
At this time, the tip of the pick-up needle is slid and brushed diagonally from the lateral direction by the relative movement between the direction of movement of the pick-up needle itself and the direction of rotation of the drive means of the brush itself. It is possible to effectively remove foreign matter such as dust that has gotten around and adhered to the side surface near the needle.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the pick-up needle cleaning device according to the present invention, FIG. 1 is a vertical sectional view of a brush, FIG. 2 is a schematic diagram of the pick-up needle cleaning device, and FIG. 3 is a needle tip. FIG. 4 is a vector diagram showing the bottom shape of the needle tip and the cleaning direction of the brush when dust is attached. 1... Brush, 2... First cleaner section, 3...
Second cleaner section, 4...arm, 5...cantilever, 6...pick-up needle, 8...magnet, 9...iron piece.

Claims (1)

[Scope of Claim for Utility Model Registration] In a capacitive video disc player in which a brush-like needle cleaner is provided between a stop position of an arm that drives a pick-up needle and a placement position on the disc, the needle cleaner is formed by flocking at least two types of materials, a relatively hard material and a relatively soft material, in each region, and is rotatably provided by a driving means with the needle axis direction of the pick-up needle as the rotation axis. When cleaning the pick-up needle, the needle cleaner slides the needle tip from an obliquely lateral direction relative to the moving direction of the needle tip of the pick-up needle by rotationally driving the needle cleaner by the driving means. , a pick-up needle cleaning device characterized by brushing.