JPH0682474B2 - Cleaning device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning device used for a reproducing pickup needle or the like used in an information recording medium reproducing device.

2. Description of the Related Art Conventionally, in a capacitance type video disk player, for example, there is a strong possibility that reproduction defects may occur due to dust adhering to the pick-up needle, so that a method of cleaning the pick-up needle has been very important.

An example of the above-described conventional cleaning device will be described below with reference to the drawings.

FIG. 3 shows the structure of a conventional cleaning device. In FIG. 3, 2 is a cleaner base for holding all parts, 7 is a rotary shaft press-fitted onto the cleaner base 2, 4 is a rotary base, and the rotary shaft 7 is inserted with a slight clearance. There is. A cleaning member 6 is attached to the rotary table 4. A cleaner rod 8 is held by the cleaner base 2 and is in contact with the turntable 4. Reference numeral 8a is a cylindrical portion that is integrated with the cleaner rod 8. Ten
Is a torsion coil spring and is in contact with the cleaner rod 8 and the cleaner base 2. A magnet 12 is fixed to the cleaner base 2. 14 is a pickup needle, and 16 is a cantilever, which are integrated with each other. 16a is a cantilever magnet, which is built in the cantilever 16.

The operation of the cleaner configured as described above will be described below.

When the reproducing operation is completed, the pickup needle 14 moves as shown by the arrow in the figure, and at the position where it comes above the cleaning member 6,
The magnet 12 causes the cantilever magnet 16a to press the pick-up needle 14 against the cleaning member 6 with a constant stylus pressure due to the effect of attraction and repulsion. In this state, the pickup needle 14 further moves to slide on the cleaning member 6 to remove dust, and then by the side wall of the arm housing (not shown) holding the cantilever 16,
The cylindrical portion 8a on the cleaner rod 8 is pushed over, and the rotary table 4 is slightly rotated. Further, when the arm housing (not shown) moves in the opposite direction, the torsion coil spring 10 pushes the cleaner rod 8 back. At that time, the cleaner rod 8 is separated from the rotary table 4, so that the rotary table 4 ( The cleaning member 6) always rotates only in one direction, and the sliding locus with the pickup needle 14 is changed at any time.

Problems to be Solved by the Invention However, with the above-mentioned configuration, the pickup needle
Even when 14 is at the final position (start point), the magnetic force of the magnet 12 affects the cantilever magnet 16a, which has a factor of varying the needle pressure of the pickup needle 14 itself.

In view of the above problems, the present invention provides a cleaning device that allows a cleaner magnet to escape to a predetermined position so that it is not affected by the magnetic force of the magnet.

Means for Solving the Problems In order to achieve this object, a cleaning device of the present invention includes a rotation drive unit that rotates a cleaning member in only one direction by engaging and disengaging gear meshing of a gear transmission mechanism. A magnet for pressing a pickup needle for reproducing the information recording medium held in the arm housing against the cleaning member, and the rectilinear movement of the arm housing reciprocating in the radial direction of the information recording medium is performed by the cleaning member. By converting into rotational movement, the pickup needle for reproducing the information recording medium is wiped, and
When the arm housing is at the rest position, the magnet is allowed to escape to a position where there is no influence of attraction.

Action With this configuration, when the arm housing is at the rest position, the magnet escapes to a position where there is no influence of the cantilever magnet, so that there is an advantage that the needle pressure of the pickup needle is not changed by the magnet.

Embodiment One embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows the structure of the cleaning device in one embodiment of the present invention. In FIG. 2, reference numeral 32 is a geared rotary base in which a gear and a rotary base are integrated, 20 is a cleaner base holding all parts, and 38 and 36 are press-fitted into the cleaner base 20 by rotary shafts. A cleaning member 34 is attached to the rotary table 32 with gears. Reference numeral 14 is a pickup needle used for reproduction of the information recording medium reproducing apparatus, 16 is a cantilever for holding the pickup needle 14, and 16a is a cantilever magnet built in the cantilever 16. 24 is a fan-shaped external gear for rotating the turntable with gears,
24a is a guide shaft used to regulate the movement of the fan-shaped external gear 24, and 20a and 20b are guide grooves for guiding the guide shaft 24a to regulate the movement of the fan-shaped external gear 24, and an inclined guide groove. . Reference numeral 24b is a rotary shaft for rotating the fan-shaped external gear 24, and 22 is a rotary arm for converting linear movement of an arm housing (not shown) into rotation, which is inserted into the rotary shaft 36 with a minute gap. There is. 22a is a column that abuts on the arm housing (not shown), 28 is a torsion coil spring for urging the rotating arm 22 in one direction, and one end is the rotating arm 22.
The other end is hung on the cleaner base 20. Reference numeral 30 denotes a torsion coil spring for biasing the fan-shaped external gear 24 in one direction, one end of which is hooked to the fan-shaped external gear 24 and the other end of which is hooked to the rotating arm 22. A magnet 26 is fixed to the rotating arm 22.

The operation of the cleaning device configured as described above will be described below with reference to FIGS. 1 and 2.

First, FIG. 2 is an overall configuration diagram of an embodiment. When the reproducing operation is completed, the pickup needle 14 moves as shown by the arrow in the figure, and when it reaches the cleaning member 34, the magnet 26
The pickup needle 14 is pressed against the cleaning member 34 with a constant stylus pressure by the effect of attraction and repulsion of the cantilever magnet 16a. In this state, the pickup needle 14 further moves and slides on the cleaning member 34, and after removing dust, the side wall of the arm housing (not shown) holding the cantilever 16 causes the rotation arm 22 to move. The support 22a is pushed away, and the geared rotary table 32 is rotated clockwise through the rotary arm 22 and the fan-shaped external gear 24. At the same time, the magnet 26 fixed to the rotating arm 22 also moves, and the magnet 26 can escape to a position where the magnetic force does not affect the cantilever magnet 16a (the position shown by the dotted line).
The guide shaft 24a passes through the inclined guide groove 20b at first, and when it gets over it, it passes through the guide groove 20a next, and the fan-shaped external gear 24 and the rotary table 32 with gears always engage / disengage the meshing, The rotary table 32 (cleaning member 34) is rotated only in one direction, and the sliding locus with the pickup needle 14 is changed at any time.

In FIG. 1, the positional relationship between the pickup needle 14 and the magnet 26 is a locus as indicated by the arrow in the figure. At first, the pickup needle 14 and the cleaning member 34 are separated from each other, and when the cantilever magnet 16a approaches the magnet 16 and is affected by the magnetic force, the pickup needle 14 approaches and contacts the cleaning member 34, and the cantilever magnet 16a moves to the magnet 16. The pickup needle 14 and the cleaning member 34 continue to slide while being affected by the magnetic force. After a while, the magnet 26 starts to rotate and moves away from the cantilever magnet 16a, but the influence of the magnetic force still remains, and the cleaning member 34 starts rotating, so that the pickup needle 14 is still in a sliding state. When the magnet 26 further rotates and the influence of the magnetic force on the cantilever magnet 16a disappears, the pickup needle 14 is a cleaning member.
Away from 34.

As described above, the drive unit for rotating the cleaning member 34 and the device for moving the magnet 26 are integrated.

As described above, according to the present invention, when the arm housing is at the stop position, the magnet for pressing the reproducing pickup needle against the cleaning member is moved away to a position where the magnetic force does not affect the pickup needle pressure. It can be prevented from affecting.

[Brief description of drawings]

FIG. 1 is a locus diagram of a cleaning device in one embodiment of the present invention, FIG. 2 is an overall perspective view of the cleaning device in one embodiment of the present invention, and FIG. 3 is an overall perspective view of a conventional cleaning device. 6-fan external gear, 14-pickup needle, 16-cantilever, 16a-cantilever magnet, 22-rotating arm, 26-magnet, 34-cleaning member.

Claims (1)

[Claims] 1. A pickup needle for reading a signal from an information recording medium, and holding the pickup needle at one end,
A cantilever holding a cantilever magnet at the other end, an arm housing that supports the cantilever rotatably in the vertical direction and can reciprocate together with the cantilever in the radial direction of the information recording medium, and dust of the pickup needle. And a magnet for pressing the pick-up needle against the cleaning member by rotating the cleaning member only in one direction by engaging and disengaging the meshing of the cleaning member and the gear of the gear transmission mechanism. A rotary arm for converting a linear motion of the arm housing into a rotary motion of the cleaning member, the rotary arm converting a linear motion of the arm housing into a rotary motion of the cleaning member. , Further, the cantilever by the magnet The magnet is attracted when the pick-up needle slides on the cleaning member by pressing the pick-up needle against the cleaning member due to the suction and repulsion effect of the gnet and the arm housing is at the rest position. A cleaning device configured to escape to a position that is not affected by.