JPS5846635Y2 - Moving coil type pickup cartridge - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a moving coil type pickup cartridge.

The moving coil type pickup car 1 helicopter vibrates a power generating coil in a magnetic field according to the vibrational displacement of a regeneration needle transmitted via a cantilever, and induces a voltage according to this vibrational displacement. As shown in Figures 1 and 2, the structure is as shown in Figures 1 and 2.
A cylindrical pole piece 3 is fixed to one of the yokes 2a and 2b fixed to both ends of the pole piece 3, and a magnetic gap 4 is formed between the end face of this pole piece 3 and the end face of the other yoke 2a opposing this. Inside, the generator coils 5L and 5R of the left and right channels are wound so as to be orthogonal to each other, and an armature 8 to which a cantilever 7 having a reproducing meter 6 at its tip is fixed is positioned, and the record sound groove (recorded signal) is traced. It has a structure in which the armature 8, that is, the generator coils 5L and 5R vibrate in the magnetic gap 4 in proportion to the vibration of the regenerator 6.

As mentioned above (the winding structure of the generator coils 5L and 5R is
(shown in the figure) has a structure in which the generating coils 5L and 5R are wound around an extremely small square-shaped armature 8, which not only has poor workability and requires a large amount of time for winding work. In addition, the winding state of the generator coils 5L and 5R tends to be uneven, making it unsuitable for mass production and expensive.

The present invention improves these conventional drawbacks, and will be explained in the drawings below.

3 and 4, a conductive film 10 with a sawtooth pattern printed on a square insulating substrate 9 to be fixed to a cantilever is formed, and a magnetic field is formed on the forward (or backward) path of this conductive film 10. The body 11 is arranged using a printing wiring technique or the like to constitute a power generation body corresponding to the power generation coil 5L (or 5R) of one channel.

Next, the insulating substrate 9 having this structure is laminated so that the conductor films 10 formed on the surface thereof are perpendicular to each other to constitute a power generation body corresponding to the power generation coils 5L and 5R of the left and right channels.

The conductive film 10 is formed by forming a structure of a highly conductive metal such as gold, silver, copper, aluminum, etc. on the surface of the insulating substrate 9 by a method such as vacuum evaporation, sputtering, ion blasting, or plating. This conductive thin film is subjected to photoetching, chemical etching, etc., or electron beam, laser, etc. processing to etch the conductive thin film to a depth that reaches the insulating substrate 9, thereby forming a sawtooth pattern of the conductive film 10.
form.

When the power generator with the above structure is vibrated in a magnetic field, voltages in the same direction are induced in the forward and backward portions of the conductor film 10 and cancel each other out, but only in the forward path of the conductor film 10. Since the magnetic material 11 is disposed in the forward path, the magnetic flux is concentrated in the forward path and interlinks, and the difference in magnetic flux density between the forward path and the backward path is 20.
dB or more, and therefore, the difference in induced voltage between the outgoing and returning sections is more than 20 dB, so the canceling effect of the induced voltages in the outgoing and returning sections is practically ignored, and the function as a generating coil is lost. can get.

The above structure differs from the conventional structure in which the power generation coils 5L and 5R are wound around the armature 8, and the power generation body corresponding to the power generation coils 5L and 5R is constructed by a conductive film 10 printed on an insulating substrate 9. Since the structure is extremely simple and no winding work is required, workability is significantly improved, and power generators with stable quality can be mass-produced, resulting in a significant reduction in cost.

Furthermore, the mass of the power generating body is reduced, and therefore the equivalent mass of the vibration system including this power generating body is reduced, and the performance of the pickup cartridge, particularly the high frequency characteristics, is improved.

In addition, the insulating substrate 9 has a square shape, and the conductor film 10 formed on its surface has a shape that corresponds one-to-one to the conventional power generation coils 5L and 5R, so that the conventional support structure for the magnetic circuit and vibration system can be replaced. It can be used as is, and the advantages include not only easy fabrication of the pattern of the conductive film 10 but also the ability to directly lead out both terminals of the conductive film 10 from the outer periphery of the insulating substrate 9, making it easy to process the lead wires. has.

As described above, the present invention utilizes printed wiring technology to connect the power generation coils 5L and 5R with a conductor film printed on the insulating substrate 9.
The structure is extremely simple, the workability is significantly improved, it is suitable for mass production, the quality is stable, the cost is significantly reduced, and the performance is further improved. It has practical advantages such as

[Brief explanation of the drawing]

Figure 1 shows a conventional moving coil pickup car 1
- Figure 2 is a diagram showing the structure of the IJ joint, Figure 2 is a diagram showing the structure of the power generating coil part, and Figures 3 and 4 are the diagrams showing the structure of the power generating part of the moving coil type pick-up cart joint of the present invention. FIG. 7 is a cantilever, 6 is a regeneration needle, 5L and 5R are power generation coils, 9 is an insulating substrate, 10 is a conductive film, and 11 is a magnetic material.

Claims (1)

[Scope of utility model registration request] In a moving coil type pickup cartridge that includes power generation coils 5L and 5R that vibrate and induce voltage in accordance with the vibrational displacement of the regenerator 6 transmitted via the cantilever 7 in a magnetic field, the power generation coils 5L and 5R are mounted on an insulating substrate. Conductor film 10 with a sawtooth pattern printed on 9
, and a magnetic material 11 is formed on the outgoing or returning path of the conductor film.
A moving type pickup cartridge characterized by being configured by arranging.