JPS6012400Y2 - MC type pickup cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an MC (moving coil) type pickup cartridge for a record player.

An object of the present invention is to provide an MC type pickup cartridge that eliminates the need for a special yoke, has good power generation efficiency, and is lightweight.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of the pickup cartridge, and a non-magnetic hollow armature 3 is fixed to the base end of a cantilever 2 having a needle 1 at its tip.
A coil 4 and a coil 4R are attached to the end faces of the needle 1 at 45 degrees left and right with respect to the needle 1 so that the winding axis is perpendicular to the cantilever 2.

The coils 4L-4R are located in the same plane.

5L and 5R are magnets for applying magnetic flux to the coils 4L and 4R, respectively, and are each formed of two magnets.

That is, for example, if we look at one magnet 5L, as shown in Fig. 3A, magnet 5 is placed in a state where different polarities are joined, and 5 and 2 are aligned, and the polar boundary surface (line) is
The coil 4L is arranged and fixed parallel to the coil 4L so that the winding axis of the coil 4L coincides with the coil 4L.

Note that the cantilever 2 is attached with the armature 3 being pulled to the holder 8 by the piano wire 6 via the damper 7, so that the cantilever 2
can vibrate around the center of the armature 3 as a fulcrum.

In the above, when the stylus 1 falls into the recess in the wall of the left channel of the groove on the record, the cantilever 2 rotates in the vertices direction, thereby displacing the coil 4L from A to A in FIG. , the magnetic flux φ from the magnet 5L flows from the top to the bottom of the coil 4L, and therefore a voltage of a certain polarity is induced in the coil 4L.

Furthermore, if the stylus 1 rides on the protrusion on the wall of the left channel of the record groove, the cantilever 2 rotates in the L2 direction opposite to the above case, and the coil 4
L is displaced as shown in Figure 3, and the magnetic flux φ from the magnet 5L flows from the bottom to the top of that coil, so that a voltage of opposite polarity to that in the previous case is applied to that coil 4L. become induced.

Note that when the cantilever 2 vibrates in the L direction as described above, the coil 4R only moves toward and away from the magnet 5R, but does not rotate, so no change in the number of interlinked magnetic flux occurs. Therefore, no voltage is induced.

Further, when the cantilever 2 vibrates in the R direction, the other coil 4R vibrates and a voltage is induced.

In this case, no voltage is induced in the coil 4L.

Therefore, from the above, the degree of separation between the left and right channels is good.

Also, the magnetic bias is applied to the coils 4L and 4R by the magnet 5L, which has a magnetic pole surface parallel to the winding axis of the coil.
, 5R, there is no need for a yoke or the like, which improves magnetic conversion efficiency, improves power generation efficiency, and makes it possible to reduce the weight of the entire cartridge.

In addition, coil 4-. Since the magnetic circuit does not block the periphery of 4R, the vibration system can be easily attached and detached, making it possible to use a replaceable needle type.

FIG. 4 is an exploded view of the same, in which A is a vibration system of a replaceable needle type, and B is a cartridge body including a magnetic circuit.

The vibration system A is positioned in the cartridge body B by a pin a1, and the outputs of the coils 4L-4R are connected to the cartridge body B by a pin τ''4a2.

Area is a group of pins for connecting to the herad shell.

As described above, according to the present invention, it is possible to realize an MC type pickup cartridge that has good power generation efficiency, is easily lightweight, and can easily be made into a replaceable blade type.

[Brief explanation of the drawing]

Figure 1 is a front view of an MC type pickup cartridge according to an embodiment of the present invention, Figure 2 is a side view of the left channel, and Figure 3 is a side view of the left channel.
The figure is an explanatory diagram of the power generation operation, and FIG. 4 is a perspective view of the replaceable needle type. 1... Needle, 2... Cantilever, 3.
... Armature, 4L, 4R@...06 coil,
5L, 5R...Magnet.

Claims (1)

[Scope of utility model registration request] A coil is fixed to the base end of a cantilever having a needle at the tip so that the winding axis is oriented perpendicular to the cantilever,
A magnet having bipolarity formed in one direction of the cantilever is fixedly arranged parallel to the coil with a slight gap on the opposing surface, and the coil is aligned with the magnetized boundary of the magnet at the neutral position of the cantilever. An MC type pickup cartridge characterized by being positioned in parallel.