JPS6131367Y2 - - 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 characteristics include a spacer that protrudes from the holder into the cylindrical damper and has a suspension wire fixed to its tip. The vertical compliance of the cylindrical damper is made smaller than that in the horizontal direction by making the end face of the damper longer in the vertical 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 moved from the exchange needle holder to the cylindrical damper 4.
The cylindrical damper is made to protrude inward, and the compliance of the cylindrical damper is adjusted by adjusting the amount of protrusion.

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 FIGS. 2 and 3, taking a movable magnet type pickup cartridge as an example. In addition, parts given the same reference numerals as in FIG. 1 represent the same members.

Figures 2A and 2B are a horizontal sectional view and a vertical sectional view, respectively.
8' is obliquely shaved off, a suspension wire 5 is inserted and fixed, and the needle holder 6 protrudes into the cylindrical damper 4. Therefore, the portion of the cylindrical damper 4 into which the spacer 17 is press-fitted is compressed more strongly in the vertical direction (as shown by the arrow in FIG. 2B) than 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, the low-frequency components of musical sound signals recorded in the record grooves are mostly horizontal components, and as a result, vibrations caused by warping of low-frequency records have only vertical components. ing. Therefore, the pick-up cartridge of the above embodiment sufficiently traces the low-frequency components of the musical tone signal, and does not pick up noise signals caused by warping of the record.

To adjust vertical and horizontal compliance, remove the scraped portion 18,1 of the spacer 17.
This can be done very easily since it is only necessary to change the size and angle of 8'.

As explained above, the support structure of the vibration system in the pick-up cartridge of this invention is achieved by forming the tip of the spacer press-fitted into the cylindrical damper to be long in the vertical direction and short in the horizontal direction. ) The horizontal compliance of the cylindrical damper can be set larger than that in the vertical direction, and (b) it is possible to set the horizontal compliance of the cylindrical damper to be larger than that in the vertical direction, and (b) to prevent excessive vibrations caused by record warping, etc., without impairing the trackability against low-frequency horizontal vibrations. The vertical low frequency co-frequency can be increased to the extent that low frequency noise is not picked up.

This has a unique effect.

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

[Brief explanation of drawings]

Figure 1 is a vertical sectional view of the vibration system of a conventionally known movable magnet type pick-up cartridge;
Figures A and B are horizontal sectional views showing the support structure of the vibration system of this invention, and Figure 3 is a perspective view of the spacer of this invention. 3... Disk-shaped magnet, 4... Cylindrical damper, 5
...Suspension wire, 6...Replacement needle holder, 7,17...Spacer, 18,18'...
The part that was scraped off.

Claims (1)

[Scope of utility model registration request] A vibration system in which an armature is fixed to the rear end of a cantilever having a regenerating needle at the tip, a cylindrical damper, and a spacer having a tip surface whose vertical length is larger than the horizontal length protruding from the holder into the cylindrical damper. A pick-up cartridge comprising: a rear end surface of the vibration system is swingably supported by the cylindrical damper and a suspension wire fixed to the tip of the spacer.