JPS5824245Y2 - Pickup Cartridge - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pickup cartridge for stereo reproduction.

Generally, it is desirable for the vibration system of a pickup cartridge to vibrate faithfully in accordance with the vibration waveform engraved in the sound groove of a record, but the external factors that affect the vibration of the vibration system during playback and their magnitude vary depending on the direction. They are different, especially in the horizontal and vertical directions.

For example, vibrations caused by the warping of a record have mostly vertical components and very little horizontal components, and the stylus load applied to the stylus tip at the tip of the vibration system acts in the vertical direction.1.
It has little to do with the horizontal direction.

In order to deal with the fact that the vibration has different effects in the vertical and horizontal directions, it may be better to make the mechanical vibration characteristics of the pickup cartridge different in the horizontal and vertical directions.

For example, when trying to eliminate the effects of vibrations caused by warped records as mentioned above, it is important to note that most of the vibrations in the ultra-low frequency range caused by warped records are vertical components, and the sound grooves of records are Most of the components in the ultra-low frequency range of the musical sound signal recorded in the sound signal are in-phase components of the left and right channels, that is, they are horizontal components. It is considered that it is sufficient to cut only the vertical component of .

However, simply increasing the stiffness of the entire damper to support the vibration system would have cut out all vibrations in the ultra-low frequency range, both vertically and horizontally.As a result, the above-mentioned record disc This results in the inconvenience that not only the vertical vibrations due to the warpage but also the horizontal vibrations of the ultra-low range components of the musical tone signal are cut.

However, in conventional pickup cartridges, the vibration waveforms of the left and right channels, which are carved on each slope of the sound groove of a record that is 90 degrees to each other and inclined at 45 degrees to the horizontal direction, are transmitted perpendicularly to each slope. direction, i.e. horizontal,
Since the signal output of the left and right channels is directly detected as vibration in a direction inclined at 45 degrees in the vertical direction, complete structural and electrical symmetry is required, and therefore the mechanical vibration characteristics of the vibration system are It was inappropriate and difficult to make the difference between the aquatic direction and the vertical direction.

For example, in a conventional Me type pickup cartridge, as shown in FIG. X-shaped armature 3 along the direction
In other words, an armature 3 having protruding pieces 3A to 3D protruding in four directions inclined at 45 degrees with respect to the water column and the vertical direction is attached, and each protruding piece 3A to 3D of this armature 3 is attached.
It is known that a pair of left and right detection coils 4 A t 4 B are wound in 3D, and the vibration system 5 configured in this manner is arranged such that the armature 3 is located in the gap γ of the magnetic circuit 6. However, in the MC type pickup cartridge having such a configuration, the vibration of the regeneration needle 1 in a direction inclined at 45 degrees to the left and right with respect to the vertical direction is detected as the rotation of the armature 3 around the axis in the said direction. Therefore, it was extremely difficult to construct a vibration system that was suitable for both horizontal and vertical vibrations, as it required symmetry in directions tilted 45 degrees to the left and right with respect to the vertical direction. .

This idea was devised in view of the above circumstances, and was developed in order to advantageously deal with the difference in the effects of vertical and horizontal vibrations, such as vibrations caused by warping of records. The object of this invention is to configure a vibration system to be compatible with both directional vibration and vertical vibration.

In other words, this idea improves the vibration characteristics of the vibration system in two directions, horizontal and vertical, by configuring the armature of the vibration system so that the upper and lower parts with respect to the horizontal axis and the left and right parts with respect to the vertical axis have different shapes. Click to change the
As a result, the compliance of the vibration system with respect to horizontal vibrations is made larger than the compliance with vertical vibrations, so that the vertical component of vibrations in the ultra-low range is hardly cut, but the vertical component is cut. This is what I did.

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

FIG. 3 is a vertical sectional view schematically showing the overall structure of an embodiment in which this invention is applied to an MC type pickup cartridge, and is a sectional view taken along line I-I in FIG. is its front view.

For these figures, magnets N1, 11...
is attached to the holder 13 together with the vibration system 12.

The holder 13 is arranged in a fan shape with different @poles facing each other to form magnetic gaps 14 and 15 each inclined at 45 degrees with respect to the vertical axis. It is fixed by adhesive or other means.

That is, a total of six magnets are arranged and fixed in two rows, with their magnetic poles facing each other, so that the directions of magnetic flux formed in each of the magnetic gaps 14° and 150 are opposite to each other in the front half and the rear half. There is.

The vibration system 12 includes a hollow cantilever 16 having a regeneration needle 15 at its tip, and a substantially X-shaped coil made of a non-magnetic material such as synthetic resin or aluminum fixed to the base end of the cantilever 16. The armature 1T also serves as a support, and is attached to the holder 13 via a damper 18 made of an elastic material such as rubber.

That is, on the armature 17 side of the damper 18, a substantially X-shaped recess 17a having a shape slightly smaller than that of the armature 1γ is formed, and the armature 17 is firmly fitted into this recess 17a.

A fixing part 20 having a through hole 19 in the center is fixed to the hollow part at the base end of the cantilever 16, and one end of the tension wire 21 is connected to the locking part 2 of the fixing part.
2 through the through hole 19.

On the other hand, a through hole 23 is bored at a position m of the holder 13 that is in contact with the damper 18, and a pipe-shaped wire holder 24 for fixing the other end of the tension wire 21 is provided inside the through hole 23. Fixed.

The tension wire 21 extending from the vibration system 12 is
The tension wire 21 is fixed to the wire holder 24 by passing through the hollow part of a pipe-shaped fixing member 25 that holds the tension wire 21 provided in the hollow part of the wire holder 24, and caulking the end projecting through the pipe.

Note that the wire holder 24 is fixed to the holder 13 from below the holder 13 via a screw 26.

Further, thin film coils 27.27, which are respectively arranged in the magnetic gap 14.15, are attached to the two pieces projecting upwardly of the armature 1T.

In this embodiment, the two pieces of the armature 17 that protrude upward have a different shape from the two pieces that protrude downward because the upper half is longer than the lower half, as shown in FIG. It's different.

Thus, the vibration system 12 vibrates with the point O in the figure as a fulcrum.

At this time, the horizontal component of the vibration is caused by the vertical component of the vibration because the two pieces of the armature 17 that protrude upward are longer than the two pieces that protrude downward. It is further affected by the damper 18.

In this way, the horizontal and vertical vibration characteristics of the vibration system 12 are different.

In other words, the compliance to vibrations in the horizontal direction is greater than the compliance to vibrations in the vertical direction.

Therefore, the vibration system 12 is configured to be difficult to rotate in response to vibrations in the vertical direction, but easy to rotate in response to vibrations in the horizontal direction, so that the influence caused by vertical vibrations in the ultra-low range is avoided. Removal becomes an OT function.

In the above embodiment, the armature 1γ has a substantially X-shape inclined at an angle of 45 degrees with respect to the vertical axis, and the armature 1γ has an upwardly protruding
Although the shape of the piece is different from that of the two pieces protruding downward, the shape is not limited to this, and it may be formed into an elliptical shape as shown in FIG. 5, or in the horizontal axis direction as shown in FIG. It may be formed into a rectangular shape whose length is shorter than the length in the vertical axis direction, or it may be formed into a shape in which both left and right ends of the circle are notched along the vertical direction as shown in Fig. 7. Similar to the embodiment, by making the compliance of the vibration system for horizontal vibrations larger than the compliance for vertical vibrations, the vibration characteristics of the vibration system in the vertical and horizontal directions are made different, and the vibration characteristics in the vertical direction are made different. It is possible to eliminate the effects caused by ultra-low frequency vibrations.

As is clear from the above explanation, the pickup cartridge of this invention has the shape of the armature of the vibration system such that the shape of the upper or lower part with respect to the horizontal axis is different from the shape of the right or left part with respect to the vertical axis. do,
The horizontal vibration characteristics and vertical vibration characteristics of the vibration system are made to be different, so that the compliance of the vibration system to horizontal vibration is greater than the compliance to vertical vibration. Considering that the factors that affect the vibration system are different in the horizontal and vertical directions, it is ideal for countermeasures such as removing the influence of vertical vibration caused by warping of the board and reducing only the noise. This has effects such as being able to obtain suitable vibration characteristics.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing an example of a conventional pickup cartridge, Fig. 2 is a perspective view showing the vibration system of the pickup cartridge shown in Fig. 1, and Fig. 3 is an example in which this invention is applied to an MC type pickup cartridge. FIG. 4 is a longitudinal cross-sectional view showing a schematic overall configuration of the device, and FIG. 4 is a front view thereof, and FIG. 5, FIG. 6, and FIG. FIG. 7 is a front view showing another embodiment of the armature of the pickup cartridge. 15...Regeneration needle, 16...Cantilever 11...-armature, 18...
Damper, 12... Vibration system, 13... Holder, 11... Magnet, 14.15...
...Gap, 2T...Thin film coil.

Claims (1)

[Scope of utility model registration request] A regeneration needle is provided at the tip of the cantilever, and an armature is attached to the base end of the cantilever to constitute a vibration system, and this vibration system is supported by a fixed part via a damper. By configuring the shape of P so that the shape of the upper part or lower part with respect to the horizontal axis is different from the shape of the left part 0 of the vertical axis 1, the compliance with respect to horizontal vibration of the vibration system is improved. A pickup cartridge characterized in that the vibration system is made to be more flexible than the vertical vibration compliance.