JPS6138541B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a linear tracking arm assembly, and more particularly to a linear tracking arm assembly using a moving coil type linear motor as a drive source.

A linear motor is used as a drive source for a linear tracking arm, which has the advantage of generating extremely little vibration. This linear motor is
It is equipped with a guide rail, a moving member that can move linearly along the guide rail, and a driving means consisting of a combination of a mover and a stator that drive this moving member by electromagnetic force. The tone arm is supported by the member so as to be rotatable in horizontal and vertical planes, and is used as a driving source for the linear tracking arm.

In addition, the linear tracking arm assembly includes a deviation angle detection means that detects the deviation angle in the horizontal plane of the tone arm that follows the sound groove as the record rotates during performance, and a deviation angle detection means that controls the driving force of the drive means. The control circuit supplies the drive means with a drive current according to the output of the deflection angle detection means during performance, and supplies a drive current in a predetermined direction in a predetermined direction during lead-in or return. Provides a drive current of value. However, in the conventional linear tracking arm assembly, since the control circuit is provided on the stator side, the signal transmission line from the deflection angle detection means moves with the movement of the moving member. The disadvantage is that there is a risk of a decrease in operating sensitivity.
Furthermore, when a moving coil type linear motor is used, the control line to the coil is similarly moved in conjunction with the movement of the moving member, which has the disadvantage that smooth movement of the moving member cannot be achieved. It was hot.

It is an object of the present invention to provide a linear tracking arm assembly that eliminates the above-mentioned drawbacks.

In the linear tracking arm assembly according to the present invention, a moving member supporting a pick-up arm is engaged with a guide rail made of a conductive material via an engaging means made of a conductive material, and a moving coil type linear motor is used as a driving source. The present invention is characterized in that a control circuit for controlling the coil current is mounted on the moving member, and a power supply voltage is applied to the control circuit via the guide rail and the engagement means.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a side view of one embodiment of a linear tracking arm assembly according to the present invention, and FIG. 2 is a schematic perspective view of the drive mechanism in FIG. 1. In the figure, a linear tracking arm 1 is supported by an arm holder 2 so as to be rotatable in horizontal and vertical planes, and a counterweight 3 is attached to the rear end of the arm. The arm holder 2 is supported by a movable member 4, and the movable member 4 is configured to be movable along a pair of linear guide rails 5a and 5b made of a conductive material and mounted horizontally.
That is, the structure is such that rollers 6 and 7 made of a conductive material and serving as engagement means rotatably attached to the moving member 4 are engaged with guide rails 5a and 5b, respectively.

A coil 8 as a movable element of a linear motor is attached to the lower end of the moving member 4, and this coil 8 movably surrounds a yoke 10 that constitutes a stator together with a magnet 9, which will be described later. Further, a magnet 9 constituting a field pole as a stator, which is provided along the guide rails 5a and 5b with a predetermined gap with the coil 8, is attached to a yoke 10 fixed to a base 11 such that the N pole faces each other. The magnetic flux generated from the N pole of magnet 9 is attached to coil 8.
interlink with. Therefore, by supplying a current of a predetermined value in a predetermined direction to the coil 8, a force acts between the magnet 9 and the coil portion facing the magnet 9, and the coil 8
The moving member 4, which is movable while supporting the pick-up arm 1, is driven in a predetermined direction, so that the pick-up arm 1 performs a tracking operation in a horizontal plane.

A drive current is supplied to the coil 8 from a control circuit 12 mounted on the moving member 4. This control circuit 1
2 is a drive corresponding to the output of a deflection angle detecting means (not shown) that detects the deflection angle of the pickup arm 1 that follows the sound groove as the record rotates during performance in the record player with respect to the coil 8. A drive current of a predetermined value is supplied in a predetermined direction during lead-in or return.
The deflection angle detection means is composed of, for example, a combination of a light emitting element such as a lamp, a light receiving element such as CdS, and a shutter having a slit interlocked with the pickup arm 1 between the light emitting element and the light receiving element. There is. A power supply voltage E is applied to the control circuit 12 via guide rails 5a, 5b and rollers 6, 7 made of a conductive material.

In this way, the control circuit 12 is mounted on the moving member 4, and the guide rails 5a, 5b and rollers 6, 7
By applying the power supply voltage E to the control circuit 12 via the control circuit 12, the signal transmission line from the deflection angle detection means and the control line to the coil 8 can be connected within the movable part, which enables reliable tracking control and movement. Smooth movement of the member 4 can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of a linear tracking arm assembly according to the present invention, and FIG.
It is a schematic perspective view of the drive mechanism in a figure. Explanation of symbols of main parts, 1... Pickup arm, 4... Moving member, 5a, 5b... Guide rail, 6, 7... Roller, 8... Coil, 9...
Magnet, 10... Yoke, 12... Control circuit.

Claims (1)

[Claims] 1. A guide rail made of a conductive material, a moving member that supports a pick-up arm and is movable linearly along the guide rail, and a conductive material that is attached to the moving member and movably engaged with the guide rail. a movable element including a coil attached to the moving member; and a stator including a magnet provided along the guide rail with a predetermined gap from the coil; a control circuit mounted on the movable member to control the drive current of the linear motor, and a power supply voltage is applied to the control circuit via the guide rail and the engagement means. Tracking arm assembly.