JPS6024639B2 - pick-up cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a moving coil type pickup cartridge.

The pickup cartridge of the present invention was proposed for the purpose of eliminating the drawbacks of conventional moving coil type (hereinafter referred to as MC type) cartridges.

One of the purposes is to eliminate the coil connection link or coil winding frame that was required to be provided on the cantilever.
The purpose is to simplify the structure of the cantilever and facilitate its manufacture without reducing the output of the coil.
Another feature is that when the stylus tip wears out, conventionally the entire cartridge needs to be replaced due to its structure. The first thing to do is to make it easy for even amateurs to perform. The cartridge of this invention has the following disadvantages.
It is characterized by having the following configuration conditions.

That is, the cantilever is supported by a damper rubber inside the restraining sleeve, the pair of tubular magnetic bodies are directly inserted into the cantilever at the front and rear positions sandwiching the damper rubber, and the pair is attached. Each coil is wound around a magnetic body, and the rib sleeve is mounted on a cartridge body having a pair of hawks that form a pair of magnetic fields in directions perpendicular to each other. Further, a second invention is characterized in that in the first invention, the following configuration conditions from leg (G) are provided in place of the configuration condition 'D'. That is, 'E} The sleeve is fixed to a knob that is detachable from the cartridge body, and the cartridge body is provided with a yoke that forms a pair of magnetic fields in directions perpendicular to each other, and the sleeve on the knob is detachable. (2) providing a receiving hole with an iron insert in the yoke and reaching the yoke; and
The knob and the cartridge body are removably connected by a plurality of terminals that also serve as mounting legs and their insertion holes, and the induced voltage of the coil in the knob is transferred into the cartridge body through the terminals and their iron insertion holes. energized. The invention of the lever will be explained based on the embodiment shown in the drawings. In FIGS. 1 and 3, 1 has a stylus at the tip.
A cantilever to which tip 2 is fixed, made of aluminum,
Made of duralumin, titanium, beryllium, and other materials. Reference numeral 3 denotes a sleeve made of the same material as the cantilever bar, and although it is formed into a rectangular tube shape in the illustrated example, it may have another shape, for example, a circular tube shape.

Inside the sleeve 3, the proximal end of the cantilever bar is rotatably supported by a damper rubber 4 made of an elastic material such as butyl rubber. A pair of tubular magnetic bodies (cores) 5, 5 are directly fixed to the cantilever 1 at front and rear positions sandwiching the damper rubber 4, and around the pair of magnetic bodies 5, 5, respectively. Coils 6, 6 are wound around it. As described above, the cantilever 1, the pair of tubular magnetic bodies 5, 5, and the pair of coils 6, 6 are connected via the damper rubber 4.
As shown in FIG. 1, the sleeve 3 is fixed to the knob 7a with its proximal end protruding rearward. knob 7
A is a part of a cartridge main body 7, which will be described later, and is made of synthetic resin or the like like the main body 7. A plurality of terminals 8 are provided as a shield on the rear surface of the knob 7a, and each lead wire 6a of the pair of coils 6, 6 passes through the inside of the knob 78 and is connected to these terminals 8.

FIG. 2 shows a cartridge main body 7 to which the knob 7a is detachably connected, and a magnet 9 and a pair of yokes 10, 10 shown in FIG. 4 are fixed in the main body 7 by embedding or other means. .

On the front side of the cartridge body 7, the above-mentioned knob 7 is provided.
A receiving hole 3 and a plurality of iron insertion holes 8a are provided which can respectively receive the sleeve 3 and the plurality of terminals 8 on the top. The knob 7a inserts the sleeve 3 into the receiving hole 3a,
By inserting each terminal 8 into a corresponding iron insertion hole 8a, it can be detachably connected to the force cartridge body 7, and each terminal 8 transfers the induced voltage of the coils 6, 6 to the cartridge body 7. In addition to the role of transmitting information to the side, it also serves as a mounting leg. When the knob 7a is attached to the cartridge body 7, the base end of the sleeve 3 passes through the receiving hole 3a and reaches the opposing gaps 10a and 1ob between the pair of yokes 10 and 10 inside the cartridge body 7, and the inside of the sleeve 3 Both coils 6, 6 are located in the gaps 10a, 10b, respectively. The distal ends of both yokes 10, 10 which sandwich the magnet 9 at their base ends are connected to the two gaps 102, 10b.
Since the coils 6 and 6 are bifurcated and bent so as to obtain the following, both coils 6, 6 are located within a pair of magnetic fields in directions perpendicular to each other. In the cartridge having such a structure, the cantilever 1 is vibrated in the direction of arrow P or Q in FIG. 5 with the support center of the damper rubber 4 as a fulcrum by the stylus tip 2 which is in sliding contact with the sound groove of the record.

Each coil 6 on the cantilever 1 generates an electromotive force by a corresponding magnetic field only when vibrating in one direction.
The voltage is applied to the leads 6a, 6b and the terminal 8 on the knob 7a.
. It is taken out to the outside. Note that there is a terminal 8 for connecting the cartridge body 7 and the knob 7a.
Of course, contrary to the illustrated example, it may be provided on the side of the cartridge body 7, and the corresponding iron insertion hole 8a may be provided on the side of the knob 7a. Further, in the illustrated example, the cartridge main body 7 and the knob 7a are shown as separate bodies, but the first
When carrying out only the invention described above, both 7 and 7a can be used as - bodies. In that case, each terminal 8 that also serves as a mounting leg
Needless to say, the iron insertion holes 8a corresponding thereto can be omitted, and in that case, each lead wire 6a of the coils 6, 6 may be directly connected to each terminal 11 for taking out the induced voltage. According to the MC type pickup cartridge of the present invention described above, the coils 6, 6 can be simply wound around the cantilever 1, which is formed into a rod shape, through the tubular magnetic bodies 5, 5, so that In addition to simplifying the structure and making it extremely easy to manufacture, the coils 6, 6 placed before and after the rubber damper 4, which serves as the fulcrum of vibration, have a relatively small amount of displacement, but the displacement around the magnetic material 5, 5, which serves as the core, is relatively small. Since the wire is wrapped around the wire, there is no reduction in the output.

Furthermore, a knob 7a including the force bench lever 1, coils 6, 6, etc.
Since the part is made detachable from the cartridge body 7,
When the stylus tip 2 becomes worn out, it has the advantage that it can be partially replaced regardless of whether it is an MC cartridge, and the replacement can be done extremely easily.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the knob portion of the pickup cartridge of the present invention removed from the cartridge body;
2 is a perspective view of the main body portion, FIG. 3 is an enlarged vertical sectional side view of the cantilever portion of the knob of FIG. 1, and FIG. 4 is a perspective view showing the magnet and yoke taken out from the cartridge body of FIG. FIG. 5 is a schematic front view illustrating the operation of the pickup cartridge of the present invention. 1... Cantilever, 3... Sleeve, 3a...
Reception hole, 4...Rubber damper, 5...Magnetic material, 6...Coil, 7...Cartridge body, 7a...Knob, 8...
・Terminal, 8a... Iron insertion hole, 10... Yoke. Figure 1 Dance Z Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A pick-up cartridge having the following configuration conditions (A), (B), (C), and (D). (A) Cantilever 1 with damper rubber 4 inside sleeve 3
(B) A pair of tubular magnetic bodies 5, 5 is inserted directly into the cantilever 1 at front and rear positions sandwiching the damper rubber 4, and (C) A pair of magnetic bodies 5, (D) said sleeve 3 is mounted on a cartridge body 7 provided with a pair of yokes 10, 10 forming a pair of magnetic fields in directions perpendicular to each other; 2 The following (A), (B), (C), (D), (E), (
A pick-up cartridge having the configuration conditions of F) and (G). (A) Cantilever 1 with damper rubber 4 inside sleeve 3
(B) A pair of tubular magnetic bodies 5, 5 is inserted directly into the cantilever 1 at front and rear positions sandwiching the damper rubber 4, and (C) A pair of magnetic bodies 5, (E) the sleeve 3 is wound around the cartridge body 7, respectively;
(F) The cartridge body 7 is provided with yokes 10, 10 that form a pair of magnetic fields in directions perpendicular to each other, and the sleeve 3 on the knob 7a is detachably attached to the cartridge body 7. The yokes 10, 1
(G) The knob 7a and the cartridge main body 7 are removably connected to each other by a plurality of terminals 8 which also serve as mounting legs and their insertion holes 8a. The induced voltage of the coils 6, 6 in the knob 7a is applied to the cartridge body 7 through the terminal 8 and its insertion hole 8a.