JPS6131366Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a support structure for the vibration system of a pick-up cartridge, and its feature is that the front surface of the wire holder, which the cylindrical damper that supports the vibration system comes into contact with, is vertically By forming the cylindrical damper longer in the direction, the compliance in the vertical direction of the cylindrical damper is made smaller than that in the horizontal direction.

Conventionally, a movable magnet type pickup cartridge as shown in FIG. 1 has been known.

That is, a cantilever 2 having a regenerated needle 1 at its tip
A disk-shaped movable magnet 3 magnetized in the thickness direction is fixed to the rear end, and the exchange needle holder 6 is attached to the rear end surface by a cylindrical damper 4 and a suspension wire 5.
In order to make the vibration fulcrum clear, the spacer 7 to which the suspension wire 5 is fixed is made to protrude from the exchange needle holder into the cylindrical damper, and the amount of this protrusion is adjusted to adjust the amount of the cylindrical damper. Compliance is now being adjusted.

In such devices, if the compliance of the cylindrical damper is decreased, the low-frequency mechanical impedance increases, making it easier to cause needle skipping, and conversely, if the compliance is increased and the mechanical impedance is decreased, the mechanical impedance increases. This lowered the low-frequency resonant frequency of the pick-up cartridge, making it easier to pick up noise due to warping of the record in the ultra-low frequency range, which was a cause of cross-modulation distortion.

The purpose of this invention is to obtain a support structure that can raise the low-frequency resonant frequency to an extent that does not cause ultra-low-frequency noise caused by warping of records, etc., without reducing the truckability of the pick-up cartridge.

An embodiment of this invention will be described with reference to FIG. 2, taking a movable magnet pickup cartridge as an example. In addition, parts given the same reference numerals as in FIG. 1 represent the same members.

FIG. 2A is a horizontal cross-sectional view, in which a wire holder 8 is provided inside the exchange needle holder 6', and the central hole 9 is
A spacer 7 is inserted into the wire holder 8, and the cylindrical damper 4 is supported in contact with the front surface of the wire holder 8. The wire holder 8, as shown in FIG.
The shape of the contact surface with the cylindrical damper 4 is such that the length in the vertical direction is larger than that in the horizontal direction.

In this way, the compliance of the cylindrical damper becomes large with respect to horizontal movement of the vibration system, and small with respect to vertical movement. In other words, the mechanical impedance seen from the needle tip is small in the horizontal direction and large in the vertical direction.

By the way, in general, most of the low-frequency components of musical sound signals recorded in the record grooves are horizontal components, and vibrations caused by warping of the record at lower frequencies are only vertical components. Therefore, in the embodiment described above, the low frequency components of the musical tone signal can be sufficiently traced, and noise caused by warping of the record disc will not occur.

Adjustment of compliance in the vertical and horizontal directions can be done by changing the size and angle of the part to be scraped off, and is extremely simple.

As explained above, the support structure of the vibration system of the pick-up cartridge of this invention is such that the front surface of the wire holder that abuts and supports the cylindrical damper is
By making the cylindrical damper longer in the vertical direction and shorter in the horizontal direction, (a) the horizontal compliance of the cylindrical damper can be set larger than that in the vertical direction, and (b) the truckability against low-frequency horizontal vibrations is improved. The vertical low-frequency resonant frequency can be increased to the extent that ultra-low-frequency noise caused by warping of a record, etc. is not amplified without impairing the E quality.

This has a unique effect.

In the above embodiment, a movable magnet pick-up cartridge was described, but it is to be understood that the vibration system support structure of this invention can be used for various pick-up cartridges such as a moving coil type and a movable iron piece type. Needless to say.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of the vibration system of a conventionally known movable magnet type pick-up cartridge;
Figure A is a horizontal sectional view showing the support structure of the vibration system of this invention, and Figure B is a perspective view of the wire holder. 3...Disc-shaped movable magnet, 4...Cylindrical damper, 5...Suspension wire, 6, 6'...
Replacement needle holder 7...Spacer, 8...Wire holder, 10, 10'...Diagonally scraped portion.

Claims (1)

[Scope of utility model registration request] It is equipped with a vibration system in which an armature is fixed to the rear end of a cantilever with a regenerating needle at the tip, and a wire holder whose front face is longer in the vertical direction than in the horizontal direction, and the rear face of the vibration system is connected to a cylindrical damper and a suspension. 1. A pick-up cart cartridge, characterized in that the pick-up cartridge is supported on the front surface of the wire holder by a wire.