JPS6042680B2 - Pickup Cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pickup cartridge for playing records.

More specifically, it is a moving iron type cartridge. In the conventional moving iron type, as shown in FIG. 6, an armature 22a is provided near the base of the cantilever 21, and a pole piece 29 is provided opposite the armature 22a. It was wrapped and warm.

The magnet 22 is provided near the armature 22a, and the magnetic circuit is connected from the magnet 22 to the armature 22a.
2a Armature 22a to pole piece 29 Yoke 29 continuous from pole piece to pole piece 29
a) Furthermore, there was a magnet 22 from the pole piece 29. In this way armature-2
Generally, a power generating mechanism such as 2a or a coil is provided behind the cantilever 21'. Armature Your 22
Since trace vibration is transmitted to the armature 22a using the cantilever as a medium because point a is located close to the vibration fulcrum, the trace vibration of the needle tip and the armature 22a are
It is difficult for the vibrations of a to match perfectly, and this has been a cause of reproduction distortion. Therefore, as shown in FIG. 5, the present applicant has applied for a cartridge in which a magnet 22 is fixed to the tip of a cantilever 21, and a ball piece 29 and a coil 30 are provided in front of the magnet 22.

The disadvantage of this M-M type cartridge is that a small magnet is used to reduce the mass of the magnet 22, so the magnetic flux density of the magnet becomes small, resulting in no output. Furthermore, since the magnet is fixed to the top of the needle tip, it is difficult to maintain a dynamic balance between the horizontal and vertical directions of the needle tip. Therefore, the present invention eliminates the above-mentioned drawbacks, reduces the mass of the armature 2, makes it easier to dynamically balance the vibrator by wiring the wire of a magnetically conductive material, increases the magnetic flux density, and creates a high-output cartridge. The purpose of this invention is to provide an M-J type cartridge with excellent characteristics. Embodiments of the present invention shown in the drawings will be described as follows.

FIG. 1 is a longitudinal sectional view of the cartridge of the present invention, and the cartridge includes a cantilever 1, an armature 2, a needle tip 3, a damper rubber 4, a damper mounting flange 5,
It consists of a needle assembly consisting of a fitting base 6, a power generation mechanism consisting of a magnet 7, a yoke 8, a ball piece 9, a coil 10, and a cartridge housing 11.

The power generation mechanism is fixed to the cartridge housing 11, and the needle structure is fixed to the power generation mechanism by attraction with a magnet 7, so that it can be removed. The needle structure will be explained in more detail.

The cantilever 1 is a vibrator made of non-magnetic material, and the first
There are straight cantilevers 1 with the same diameter as shown in the figure, and tapered cantilevers 1 with different outer diameters as shown in FIG. A needle tip 3 is fixed to the tip of the cantilever 1. The fixing method is to provide a through hole 1a in the cantilever and pass the base 3a of the needle tip 3 through the hole 1a as shown in FIG. This is a method of adhering and fixing it there with adhesive. Next, the wire armature end 2 is adhesively fixed onto the flat surface of the cantilever 1. The wire armature 2 is inserted into the cantilever tube through the through hole 1c by making a through hole 1c in the plane of the cantilever 1, and is fixed to the lower side of the cantilever as shown in FIG. It is designed so that more mass is applied to the lower part of the central axis m, and the balance with the upper part of the central axis is balanced. The wire armature 2 is fixed by a vibrator 5a at the base of the cantilever, and the portion behind it acts as a suspension wire.

The suspension wire 2a and the wire armature 2 may be of the same line as shown in the drawings, or if they are made of different materials, they are connected at the location where they are fixed by the vibrator 5a.
A damper mounting flange 5 is fitted and fixed to the cantilever 1 at the base of the cantilever, and a damper rubber 4 is adhesively fixed to this flange. A suspension wire 2a is extended through approximately the center of the damper rubber 4 and is fixed within the fitting base 6. Further, the damper rubber 4 is adhesively fixed to this fitting base 6. Since the fitting base 6 is made of a magnetic material, it is attracted and fixed to the upper magnet with one touch.

A guide plate 7a is fixed to the outer periphery of the magnet so as to be attracted at a predetermined position, and the fitting base 6 is attracted into this guide plate. When replacing the needle, it can be removed with one touch by pulling the fitting base 6 downward. A yoke 8 is provided above the magnet 7, and is magnetically coupled to a ball piece base 9a of a coil 8a provided in front. Since they are magnetically coupled, they are divided into a front yoke 8a and a rear yoke 8b, as shown in FIG. 1, and may be installed with a space 12 between them. By providing the space 12, it becomes possible to maintain a constant gap between the wire armature 2 and the ball piece 9. Four coils 10 are arranged in parallel at the front of the cartridge, and the two front coils are connected at a ball piece base 6.

Similarly, the two rear coils are connected. As shown in FIG. 4, the end of the ball piece 9 acting as the magnetic core of each coil 10 opens a slight gap in front of the wire armature 2, and extends left and right with respect to the vertical axis of the wire armature. Place it at a 45 degree angle. Since the cartridge of the present invention is constructed as described above, trace vibration occurs as the needle tip 3 traces the record, and the trace vibration is absorbed by the wire armature provided close to the needle tip. 2, the wire armature 2 vibrates and the four ball pieces 9, 9, 9
, 9 and acts to approach or move away from each ball piece, an output voltage proportional to the vibration of the needle tip is detected in the coil 10 wound around the intermediate portion of each ball piece.

Since this output voltage is proportional to the displacement speed of the needle tip 3, providing the armature directly above the needle tip results in a higher displacement speed and higher output voltage than in the prior art. Also, by making the magnet 7 larger, the magnetic flux density of the flux from the armature 2 can be increased.
This has the effect of obtaining a large output voltage. Conventional magnets attached to the tip of the cantilever are small and very difficult to process, but the present invention allows the magnet to be larger and has the effect of making it easier to process the magnet. Furthermore, because it has become easier to maintain dynamic balance, the armature can be positioned at a greater distance from the stylus tip, and the ball piece can also be positioned further away from the record surface. It also has the effect of protecting the board from damage.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the present invention, FIG. 2 is an enlarged vertical cross-sectional view of the tip of the vibrator, FIG. 3 is a vertical cross-sectional view of another embodiment of the vibrator, and FIG. 4 is a cross-sectional view taken along the line X-X in FIG. A cross-sectional view of the line, Figure 5 is the conventional M-M
FIG. 6 is a side view of a conventional M-1 type cartridge. 1... Cantilever, 2... Armature, 3... Needle tip, 4... Damper rubber, 5... Flange, 6... ...Mating base.

Claims (1)

[Claims] 1. A needle tip is fixed to the bottom surface of the tip of the cantilever made of a non-magnetic material, and an end of a wire armature made of a magnetically conductive material is fixed to the flat surface of the tip of the cantilever, and the other end of the wire armature is fixed to a fitting base made of a magnetic material. A needle mechanism is connected to the cartridge and is configured to be removable, and a magnet is provided above the fitting base, and a needle mechanism is provided with a small distance in front of the end of the wire armature and at an angle of 45 degrees left and right with respect to the vertical axis of the end of the wire armature. A pickup comprising a power generation mechanism in which pole pieces are provided at angular positions, a coil is wound around the middle part of each pole piece, and the base of the pole piece and the magnet are magnetically coupled by a yoke. cartridge. 2. The cantilever made of non-magnetic material is tubular and has a flat part at the tip, the needle tip is fixed to this flat part, and the wire armature fixed to the cantilever tip plane is passed through the cantilever tube and formed in line with the suspension wire. The pickup cartridge according to claim 1, wherein the fitting base of the needle structure, in which the rear end of the suspension wire is connected to the fitting base made of a magnetic material, is fixed by adsorption to a magnet of the power generating mechanism. . 3. The pickup according to claim 1, wherein the yoke for magnetically coupling the magnet and the base of the pole piece is composed of two yoke members, and the two yokes are provided with a slight gap between them. cartridge.