JPS5827363Y2 - Tone arm device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tone arm device for driving a tone arm in a record player in horizontal and vertical directions using a motor.

For example, various structures have been devised for horizontal drive motors that drive tone arms in the horizontal direction, but in all cases, they are bulky in the vertical direction, and the wiring is troublesome and prone to breakage. It had some defects.

The present invention was devised in view of the above-mentioned circumstances, and although it is equipped with a horizontal drive motor and a vertical drive motor that drive the tone arm in the horizontal and vertical directions, the entire motor is extremely small. It is very easy to wire, and the magnetic circuits of the horizontal drive motor and vertical drive motor are relatively strong, and by supplying a small current to the coils of these motors, the tone arm can be moved horizontally and vertically. The purpose of the present invention is to provide a tone arm device that can be sensitively driven.

Examples of the present invention will be described below with reference to the drawings.

First, a fixed frame 3 is fixed onto the top panel 1 of the record player via a mounting flange 2.

An arm shaft 5 is rotatably supported vertically on the fixed frame 3 via a pair of upper and lower bearings 4.

Namuko's fixed frame 3 is made of an insulator.

- A rotary frame 9 is fixed to the other end of the tone arm 8 to which a head shelf having a cartridge 6 at its tip is attached.

The fixed frame 3 has a hemispherical shape at its upper end, as shown clearly in FIG.

Further, as shown in FIG. 5, the rotating frame 9 is formed into a relatively shallow cylindrical shape.

The rotating frame 9 is inserted into the outer periphery of the fixed frame 3 from above with its open surface facing downward.

A pair of upper and lower horizontal yokes 11at11b are fixed to the upper end of the arm shaft 5 at a predetermined interval.

As clearly shown in FIG. 7, these horizontal yokes 11
A pair of pivot receivers 12a in a picot shape are provided between a and 11b.
, 12b are fixed in a state facing each other.

On the other hand, a pair of pivot shafts 13at13b are attached to the inner side of the cylindrical portion of the rotary frame 9 at two locations facing each other so as to be coaxial with each other and perpendicular to the cylindrical axis of the rotary frame 9. It is being

The tips of these pivot shafts 13a, 13b are engaged with pivot holes 14a, 14b provided in the pivot receivers 12a, 12b.

Therefore, the tone arm 8 is configured to be freely rotatable in the vertical direction, that is, in the vertical direction, with respect to the arm shaft 5, centering on the axes of both pivot shafts 13a and 13b.

Furthermore, for horizontal rotation of the tone arm 8, the arm shaft 5 is connected via both pivot shafts 13a, 13b, etc.
are also configured to rotate together.

By the way, the horizontal drive motor 16 for driving the tone arm 8 in the horizontal direction is connected to the pair of upper and lower horizontal yokes 11at.
A pair of permanent magnets 17a, which are first and second permanent magnets, are horizontally attached to opposing surfaces of the magnet 11b by adhesive bonding or mechanical fixing means.

17b, and a horizontal coil 1 disposed horizontally in close proximity to each other between the two and attached to the fixed frame 3.
It consists of 8.

Note that two sets of the pair of permanent magnets 17a, 17b and the horizontal coil 18 are provided on both sides of the arm shaft 5.

Both permanent magnets 17a and 17b are configured in a circular arc shape as the axis of the arm shaft 5.

Further, the pair of horizontal coils 18 have a flat shape, and are installed horizontally between the upper ends of the hemispherical wall portion 3a of the fixed frame 3, and have an insulating plate 1 fixed at both ends with screws 21.
The coil mounting hole 20 is horizontally buried in a pair of coil mounting holes 20 provided in the coil mounting hole 9, and is mounted by adhesive or mechanical fixing means.

These permanent magnets 17a and 17b are magnetized in the vertical direction, and are arranged so that their vertically opposing surfaces have different polarities.

And these two sets of permanent magnets 17a. Between 17b and 3rd
A closed magnetic path as indicated by ψ1 in the figure is formed.

The vertical magnetic flux generated between the permanent magnets 17a and 17b and the horizontal coil 1 indicated by arrow A or B in FIG.
The directions of the horizontal currents flowing through the currents 8 and 8 are perpendicular to each other.

On the other hand, a vertical drive motor 22 for vertically driving the tone arm 8 is connected to the inner circumferential surface of the cylindrical portion 9a of the rotary frame 9 and a U-shaped vertical yoke 23 fixed to the inside of the rotary frame 9. A pair of permanent magnets 24a and 24b, which are third and fourth permanent magnets, are vertically attached to the outer circumferential surface by adhesive or mechanical fixing means, and vertically arranged close to each other between them. and a fixed vertical coil 25 attached to the fixed frame 3.

That is, the pair of permanent magnets 24a. 24b and two vertical coils 25 are provided on both sides of the arm shaft 5.

and a permanent magnet 24a. The opposing surface of 24b is the both pivot shafts 13a.

It is constructed in a substantially concentric shape with the axis of the shaft 13b as the center.

The twisted pair of vertical coils 25 have a cylindrical shape and are curved in an arc shape centered on the arm shaft 5, and are provided in a coil mounting recess formed at the upper end of the hemispherical wall portion 3a of the fixed frame 3. 26 and attached by adhesive or mechanical fixing means.

A vertical yoke 27 fixed to the inner surface of the rotating frame 9 is inserted into the hollow portion of both twisted vertical coils 25 .

These permanent magnets 24a and 24b are magnetized in the horizontal direction, and are arranged so that their horizontally opposing surfaces have the same polarity.

Between these permanent magnets 24a and 24b, there is a diameter of φ2. A pair of closed magnetic paths as indicated by φ3 are formed.

The horizontal magnetic flux generated between the permanent magnets 24at and 24b and the horizontal direction of current flowing through the vertical coil 25, indicated by arrows C or D in FIG. 2, are orthogonal to each other.

The pair of horizontal coils 18 and vertical coils 25 are connected in series or in parallel and fixed to the fixed frame 3, and each of them is wired very simply from the fixed frame 3 to the input end.

Therefore, the number of lead wires that need to be wired from the tone arm 8 through the arm shaft 5 is only four from the cartridge 6, and the number of wires is the minimum.

When the tone arm 8 is driven in the horizontal direction, a current is passed through the pair of horizontal coils 1g of the horizontal drive motor 16 in the direction of arrow A or B in FIG.

As a result, a permanent magnet 17a is generated due to Fleming's left hand rule due to these currents and the magnetic flux ψ1.

17b1 Arm shaft 5 via horizontal yokes 11a and 11b
2, a horizontal driving torque is generated in the direction of arrow A' or B', and the tone arm 8 is driven in the horizontal direction by these torques.

At this time, the horizontal drive motor 16 has a pair of permanent magnets 17a on both sides above and below the flat horizontal coil 18.

17b are placed facing each other with different polarities such as υ facing each other. AM V dyke Q1 The magnetic circuit formed by these is relatively strong (high magnetic flux density), and a small current is applied to the horizontal coil 18. The relatively strong horizontal drive torque described above can be generated just by supplying the above.

Moreover, the permanent magnet 17at17b and the horizontal coil 18 are
Since the above-mentioned horizontal torque can be generated by installing a set of buttons on both sides of the arm shaft 5, the sensitivity of the horizontal 1 drive is good and it is easy to maintain lateral balance.

When the twisted tone arm 8 is driven in the vertical direction, the pair of vertical coils 25 of the vertical drive motor 22 are connected to the arrow C in FIG.
Or, a current is passed in the D direction.

As a result, these currents and the magnetic flux ψ2. Permanent magnet 24a according to Fleming's left hand rule with ψ3.

A vertical driving torque in the direction of arrow C in FIG. 4 is generated in the rotary frame 9 via 24b, and the tone arm 8 is driven in the vertical direction by these torques.

At this time, the vertical drive motor 22 has a pair of permanent magnets 24a on both sides of the cylindrical vertical coil 25 in the horizontal and lateral direction.
, 24b are arranged facing each other with the same polarity facing each other, and both of these permanent magnets 24a are placed in the hollow part of the vertical coil 25.

Since the common vertical yoke 27 of 24b is inserted and arranged, the overall magnetic circuit constituted by these is relatively strong (the overall magnetic flux density is high), and a small current is supplied to the vertical coil 25. By simply doing this, the relatively strong vertical drive torque described above can be generated.

Moreover, it is a permanent magnet 24a. 24b and the vertical coil 25.
Since the above-mentioned vertical torque can be generated on both sides of the arm shaft 5 by assembling, the sensitivity of vertical one-drive is good.

As described above, in the present invention, a rotary frame integrally connected to a tone arm is supported rotatably in the vertical direction on an arm shaft, a fixed frame is disposed opposite to the rotary frame, and the first and second frames are arranged horizontally. The second permanent magnets are attached to the rotating frame so as to face each other in the vertical direction, and the first and second permanent magnets are arranged so that their different polarities face each other while being magnetized in the vertical direction. and the flat horizontal coil attached to the fixed frame is connected to the first
and a second permanent magnet to constitute a horizontal drive motor, and vertically arranged third and fourth permanent magnets are attached to the rotating frame in a state of being laterally opposed to each other, and these third and fourth permanent magnets are arranged between The fourth permanent magnets are arranged so that the same poles face each other while being magnetized in the horizontal direction, and the cylindrical vertical coils attached to the fixed frame are connected to the third and fourth permanent magnets. The tone arm device is constructed by configuring a vertical drive motor by inserting and arranging a vertical yoke attached to the rotating frame into the hollow part of the vertical coil, and the tone arm device is arranged between the magnets. Although there is a horizontal drive motor and a vertical drive motor that move the arm in the horizontal and vertical directions, each of these motors is thin in the vertical and horizontal directions, so the entire motor is extremely thin. It can be configured compactly.

Since all the coils of each motor are fixed to the fixed frame side, wiring of the entire motor is very easy.

Moreover, the greatest feature of the present invention is that, for horizontal military motors, a pair of permanent magnets are placed oppositely on both sides of the flat horizontal coil, with their different polarities facing each other.
For the vertical drive motor, a pair of permanent magnets are placed oppositely on both sides of a cylindrical vertical coil in the lateral direction, with the same poles facing each other, and both of these permanent magnets are placed in the hollow part of the vertical coil. A common yoke of permanent magnets is inserted and arranged to make the magnetic circuits of these motors relatively strong (high magnetic flux density).

Therefore, although the motor as a whole is very small, it is possible to generate relatively strong driving torque in the horizontal and vertical directions by simply supplying a small current to each motor coil, and the tone arm can be moved horizontally. It can be driven sensitively in the direction and vertical direction.

It also has a high power saving effect.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a perspective view, Fig. 2 is a partially cutaway plan view, and Fig. 3 is a partially cutaway plan view.
Figure 4 is a sectional view taken along the line 2. Figure 4 is a sectional view taken along line 2. Figure 5 is a perspective view of the rotating frame. Figure 6 is a perspective view of the fixed frame. Figure 7 is a perspective view of the horizontal drive motor. It is a diagram. In the codes used in the cut drawings, 3...Fixed frame, 5...Arm shaft, 8...Tone arm,
9...Rotating frame, 16...Horizontal drive motor, 1
7a...first permanent magnet, 17b...second permanent magnet, 18...horizontal coil, 22...vertical drive motor, 24a...third permanent magnet, 24b...th 4 permanent magnet, 25... vertical coil, 27... yoke.

Claims (1)

[Scope of utility model registration request] A rotary frame integrally connected to the tone arm is supported by the arm shaft so as to be freely rotatable in the vertical direction, and a fixed frame is disposed opposite to the rotary frame, and horizontal first and second permanent magnets are vertically supported. The first and second permanent magnets are respectively magnetized in the vertical direction and are arranged so that different poles face each other, and are mounted on the fixed frame. A horizontal drive motor is constructed by disposing a flat horizontal coil having a horizontal shape between the first and second permanent magnets, and third and fourth permanent magnets having a vertical shape are laterally opposed to each other. The third and fourth permanent magnets are arranged so that the same poles face each other while being magnetized in the transverse direction, and the cylindrical magnets are attached to the fixed frame. A vertical coil forming a vertical coil is disposed between the third and fourth permanent magnets, and a vertical yoke attached to the rotating frame is inserted and disposed within a hollow portion of the vertical coil, thereby driving a vertical drive motor. A tone arm device consisting of.