JPS5916497A - Mc type pickup cartridge - Google Patents

Abstract

PURPOSE:To decrease the number of components and to simplify the assembling, by opposing two ring magnets having sectorial notch with each other, arranging the direction of magnetization to be in parallel with a cuntilever shaft and constituting a magnetic circuit. CONSTITUTION:The two ring magnets 11 magnetized in broadwise direction and having sectorial notch with 90 deg. of center angle are arranged by inserting center yoke 12 so that the same poles oppose to each other. A side yoke 13 is provided at both sides of the magnet 11, and when a magnetic circuit 10 is inserted to a hole 8 and fixed, the sectorial notch of the circuit 10 is exposed to the lower side of the hole 8. In fitting a replacement stylus knob, a moving coil 5 fixed to the root of the cuntilever is arranged in close proximity to and opposingly to the notch of the circuit 10.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an MC type pickup cartridge (hereinafter referred to as M
C cartridge), and its characteristics are that two annular magnets magnetized in the thickness direction and having fan-shaped notches are placed with the same polarity facing each other, and the magnetization direction is a cantilever axis. By configuring the magnetic circuits for both the left and right channels by arranging them parallel to each other, the number of parts is reduced. The point is that the assembly between both channels is simplified and the L5 MC cartridge shown in FIG. 1 has been known in the past.

The figure shows one channel of the mechanical-electrical conversion mechanism, with magnets A and two magnets 1 magnetized in the thickness direction.
A movable coil 5 fixed to the base end of the cantilever 4 is disposed opposite to a magnetic circuit arranged in a KE shape with the center yoke 2 and side yokes 3 so as to face the same polarity lL.

Since the magnetic circuit and the moving coil must be placed accurately in both position and direction, as shown in Figure 2,
The magnetic circuits of both channels were inserted into the magnet holder 6 beforehand, and then assembled into the cartridge body.However, after each magnetic circuit was inserted into the magnet holder and the mutual positions of the parts were adjusted, they were glued together. The work of fixing with adhesive required skill and was time-consuming because there were many parts and each S6 item was extremely small.

The object of the present invention is to provide an MC cartridge circuit that is easy to assemble and has a small number of parts and few adjustment points, without improving the drawbacks of the conventional device described above.

Embodiments of the invention will be described with reference to the drawings.

Figure 3 shows its exploded view, -J No. 1
- l) The magnetic circuit 10 is fitted and fixed into the hole 8 provided in the frame of the engine body 7 and covered with a cover.

As shown in FIG. 4, the magnetic circuit 10 consists of two annular magnets 11 that are magnetized in the thickness direction and provided with a fan-shaped cutout with a center angle of 90 degrees, arranged with the same polarity across a center yaw 12. are arranged so as to face each other, and on both sides thereof there is provided a Zite yoke 13 having an extension part 13a bent toward the center yoke side.

Positioning pieces 12a are protruded from both left and right sides of the center yoke 12, and these positioning pieces 12a fit into positioning grooves 8a provided on both side walls of the hole 8, thereby positioning the magnetic circuit in the front-rear direction and the up-down direction. I am doing it.

The upper end of the groove 8a has a wider width to facilitate insertion of the magnetic circuit positioning piece 12a.

When the magnetic circuit IO is fitted and fixed in the hole 8, the magnetic circuit 10
The fan-shaped notch part is exposed below the hole 8, and when the replacement needle knob 9 is attached, the two movable coils 5 fixed to the base end of the cantilever are exposed to the notch part of the magnetic circuit 10. They are arranged close to each other and facing each other.

Figure 5 shows a cross section taken along a plane that includes the cantilever axis and faces each vibration direction of the 15-45 stereo. The movable coil 5 reaches the end face of the extension 13a of the side yoke 13 (if the direction of the magnetizing force of the annular magnet is opposite, the direction of the magnetic flux is opposite), and is disposed at a position where the magnetic flux density is highest.

The center yaw 12 and the site yoke 13 are made of, for example, black mendur or pure iron, which has a high saturation magnetic flux density.

FIG. 6 shows another embodiment, which is annular? in
The stone 11, the center yoke I2, and the sight yoke 13 are attached to a support shaft 1 provided in the front and rear direction of the cartridge body 7.
4, the support shaft 14 has a large diameter portion 14a and a small diameter portion 141 with slightly different outer diameters, as shown in the horizontal cross-sectional view of FIG.
correspondingly two annular magnets 11 and 2.
The inner diameters of the two side yokes 13 are also slightly different,
The center yoke 12 abuts against the stepped portion of the support shaft 14 and is accurately positioned.

As explained above, the magnetic circuit of the MC cartridge of the present invention consists of two annular magnets that are magnetized in the thickness direction and have a fan-shaped notch, with the same polarity facing each other, and the direction of magnetization is cantilevered and parallel to one axis. Place it so that both left and right chi V
By configuring the magnetic circuit for the channel, the number of parts is reduced, and together with the fact that there is no need to adjust the position of phase/i between both channels, it is extremely easy to make silk. I can do it, so I can).

Note that the shapes of the annular magnet and each yoke are not limited to those in the above embodiments; in short, the left and right channels are integrated, and the end faces are orthogonal. Any shape is fine as long as it is Q.

[Brief explanation of the drawing]

Figure 1: Side view of one channel of the conventionally known Z) MC car 1-IJ/θ) Mechanical-electrical conversion mechanism Figure 2: Magnetic circuits of both channels Convulsions ``Figure 3... MC horn-1-'' which is an embodiment of this invention
Exploded view of the magnetic circuit shown in Fig. 4. Exploded view of the magnetic circuit shown in Fig. 5. Cutaway view of one channel of the mechanical-electrical conversion mechanism. Fig. 6. Exploded view of the magnetic circuit of another embodiment. Figure 7...
・Horizontal sectional view 5 ・・Movable coil 7 ・Cartridge body 8 ・hole 8a ・positioning groove 10 ・magnetic circuit 11 ・annular magnet 12 ・center yaw 12; I ・positioning piece 1: 3...Side yoke 13a...Extension portion 14...Support shaft Fig. 1゛No. 214] Fig. 3

Claims (1)

[Claims] Kafuchi17 HaM FjA's 45. -45 stereono A vibration system in which two movable coils are fixed at each vibration direction position parallel to the coil winding axis or cantilever axis, and two annular magnets magnetized in the thickness direction and having fan-shaped notches are the same. It consists of a magnetic circuit with poles facing each other and arranged in the magnetization direction or parallel to the cantilever axis.
An MC-type pink-up cartridge characterized by two moving coils arranged opposite to each other in the fan-shaped notch of the magnetic circuit.