JPS5820199B2 - Movable linear cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a movable coil type (hereinafter abbreviated as MC type) cartridge, and particularly to an MCC stereo cartridge power generation structure.

In the MCC stereo cartridge, a movable wire ring engaged with a cantilever is placed in a magnetic field within a predetermined magnetic gap of a magnetic circuit formed by a magnet and a pole piece, and the movable wire ring engages with the cantilever. The structure is such that the electromotive force generated by the movement of the sensor is extracted as a signal.

Compared to other electromagnetic stereo cartridges such as the MCC stereo cartridge, moving magnet type, moving iron type, etc., the output voltage is lower, and the wire ring is directly attached to the cantilever, making diagonal exchange possible. Although it has disadvantages such as being extremely difficult or requiring a high level of skill to assemble, and being expensive because it is not mass-produced and takes time, it is generally used in high-end machines because of its good sound quality. It is used.

In addition, various MCC stereo cartridges have been devised in the past, but as mentioned above (generally, one in which a pole piece coupled to a magnet surrounds a vibrator including a cantilever to form a magnetic circuit) is used. This has the disadvantage that the overall mass of the cartridge is heavy.

Furthermore, in order to improve power generation efficiency, specially processed coils are often used, but such coils require a high level of skill or technology to form the coils, resulting in high costs and inconvenience. It was mass-produced.

An object of the present invention is to provide an MC type cartridge that has a simple structure, high power generation efficiency, and easy needle replacement.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1a is a front view of an embodiment of the MCC stereo cartridge power generation structure according to the present invention, and a side view showing only one channel is shown.

In the figure, a cantilever 2 having a stylus snap 1 at its tip is one end of a string 4 for clarifying the vibration center of the vibration system at its rear end to which a disc-shaped member 3 made of a magnetically permeable material is fixed. is fixed.

5 is a damper provided to damp the vibration of the cantilever 2, and the cantilever 2 is attached via this damper 5 to a string holder 6 that holds the other end of the string 4.

This string holder 6 is supported by a support member 7 while applying a predetermined tension to the string 4 so that the damper 5 can fully perform its function and the vibration center of the vibration system can be clearly defined.

First and second wire rings 8a and 8b are provided on the disk-shaped member 3 at the rear end of the cantilever 20 so as to be substantially perpendicular to each other with respect to the central axis of the cantilever 2.

The first and second wire rings 8a and 8b are respectively wound around substantially U-shaped magnetic cores 9a and 9b made of a magnetic material such as permalloy.

The magnetic cores 9a and 9b are each fixed to the disc-shaped member 3 so that the central axes of their legs are substantially perpendicular to the central axis of the cantilever 2. For example, a pair of legs 9a1 of the magnetic core 9a
．． 9a2 has a wire ring 8a1 . with an equal number of turns. 8a2 are wound together with one end commonly connected to form a wire ring 8a.

It goes without saying that the first and second wire rings 8a and 8b may have a configuration that does not use the magnetic cores 9a and 9b.

10a and 10b are first and second magnet pairs each having, for example, a pair of closely spaced magnets 11a and 11b such that the same magnetic poles face each other, and each opposing magnetic pole part is connected to the first and second magnets with a prescribed gap, respectively. A pair of magnets 11a and 11b in the six first and second magnet pairs 10a and 10b, which are arranged opposite to the wire rings 8a and 8b, are arranged so that their magnetization lines are substantially parallel to the central axis of the cantilever 2. It is preferable that the

The pair of magnets 11a and 11b do not necessarily have to have the same magnetic poles in close contact with each other, and may be placed facing each other with a very small magnetic gap.

By arranging the pair of magnets 11a and 11b in close proximity so that the same magnetic poles (for example, N poles) face each other in this way, the magnetic flux is efficiently distributed from the opposing magnetic poles in a direction approximately perpendicular to the magnetization lines of the magnets 11a and 11b ( and is radiated with high density.

In the cartridge configured as described above, the operation of only one channel (the combination of the first wire ring 8a and the first pair of magnets 10a) is explained as shown in FIG. 1C when the cantilever 2 is not vibrating. Since the magnetic air gaps between the opposing magnetic poles of the magnets 11a and 11b and the legs 9a1 and 9a2 of the magnetic core 9a around which the first wire ring 8a is wound are equal, the magnetic flux passing through the wire rings 8a1 and 8a2 are equal, so the currents flowing through the coils 8a and 8a2 are canceled out.

Furthermore, when the cantilever 2 has already moved upward in FIG. 1, the magnetic gap between the opposing magnetic poles of the magnets 11a and 11b and the leg 9a1 of the magnetic core 9a is
The wire ring 8a1 is smaller than that of a2.
The magnetic flux passing through the coil 8a2 becomes larger than the magnetic flux passing through the wire ring 8a2, and a current in a predetermined direction is output according to the difference in magnetic flux.

On the other hand, when the cantilever 2 moves downward in the figure, the magnetic gap between the opposing magnetic pole part and the leg part 9a2 becomes smaller than the leg part 9a1.
Since the magnetic flux passing through the wire ring 8a2 is smaller than that of the wire ring 8aH, the magnetic flux passing through the wire ring 8a2 becomes larger than that of the wire ring 8aH, and therefore, a current in a direction opposite to the predetermined direction is outputted according to the difference in magnetic flux.

FIG. 2a is a front view of another embodiment of the power generation structure of the MC type stereo cartridge according to the present invention, and the figure is a side view showing only one channel, and the same part as FIG. 1 is shown in the figure. are indicated by the same reference numerals.

In this embodiment, the first and second wire wheels 8a and 8b
For example, cylindrical magnetic cores 12a and 12b made of a magnetic material such as permalloy are fixed to the disc-shaped member 3 in a positional relationship substantially perpendicular to each other with respect to the central axis of the cantilever 2.
The structure is the same as in FIG. 1 except that the two parts are wrapped around each other.

The magnetic cores 12 and 12b are provided so that their central axes are substantially parallel to the central axis of the cantilever 2.

In addition, as in the case of the above embodiment, the first and second wire rings 8
Of course, a and 8b may have a configuration that does not use the magnetic cores 12a and 12b.

In the cartridge configured in this manner, the operation of only one channel (the combination of the first wire ring 8a and the first pair of magnets 10a) will not be explained.When the rubber and cantilever 2 do not vibrate, the magnets 11a and 11b Since the magnetization line of the magnetic core 12a is parallel to the central axis of the magnetic core 12a, the magnetic flux from the opposing magnetic poles is guided through the first wire ring 8a at right angles to its central axis, as shown in FIG. 2C. This leads to a disc-shaped member 3 made of a magnetic material.

Therefore, no current flows through the first wire ring 8a.

Next, when the cantilever 2 has already moved upward in FIG. The magnetic gap with the left end is smaller than that with the right end of the magnetic core 12a, so the magnetic flux from the opposing magnetic pole passes through the magnetic core 12a from its left end to its right end in accordance with the rotational deviation of the magnetic core 12a. Much magnetic flux reaches the S pole of the magnet 11a.

At this time, a part of the magnetic flux that has reached the left end of the magnetic core 12a flows into the disc-shaped member 3, but the lower end of the disc-shaped member 3 and the magnet 11a.

Since the air gap between the magnet 11b and the south pole is large and the magnetic resistance is large, the magnetic flux from the right end of the magnetic core 12a to the south pole of the magnet 11a increases.

Therefore, a current flows in the first wire ring 8a in a predetermined direction according to this magnetic flux.

On the other hand, when the cantilever 2 moves downward in the drawing, the magnetic gap between the opposing magnetic pole portion and the right end portion of the magnetic core 12a becomes smaller than that between the left end portion of the magnetic core 12a. The magnetic flux from the magnetic core 12a passes through the magnetic core 12 from its right end to its left end in accordance with the rotational deviation of the magnetic core 12a, and much of the magnetic flux reaches the S pole of the magnet 11b.

Therefore, a current flows in the first wire ring 8a in a direction opposite to the above-mentioned predetermined direction according to this magnetic flux.

In this manner, in this embodiment, the wire ring performs minute rotation in the magnetic field, and power generation is performed in accordance with this rotational deviation.

Note that when the first wire ring 8a rotates, the second wire ring 8b rotates while maintaining a constant magnetic gap between both ends of the magnetic core 12b and the second pair of magnets 10b. I get a signal.

Incidentally, on the first real/stream side, the leg portions 9a1. of the magnetic core 9a.
When the interval between the magnetic cores 9a2 is widened, the magnetic flux passing through the magnetic core 9a flows similar to the second embodiment.

That is, when the cantilever 2 moves upward in FIG. It will return to the S pole of the magnet 11a.

FIGS. 3a and 3b are operational explanatory diagrams showing further embodiments of the power generation structure of the MC type cartridge according to the present invention, in which the same parts as in FIG. 2 are designated by the same reference numerals.

In this embodiment, wire ring 8a wound around magnetic core 12a
The embodiment is the same as the embodiment shown in FIG. 2, except that the disc-shaped member 3' supporting it is made of a non-magnetic material such as plastic.

To explain the operation of only one channel in a cartridge configured in this way, when the cantilever 2 is not vibrating, the magnetization lines of the magnets 11a and 11b are parallel to the central axis of the magnetic core 12a, so they are opposed to each other. The magnetic flux from the magnetic pole part (N pole) enters the magnet side part of the wire ring 8a at right angles, is directed toward both ends in the magnetic core 12a, and reaches the S pole of each of the magnets 11 a and 11 b from both ends of the magnetic core. .

In this state, no current flows through the coil 8a.

Next, when the cantilever 2 moves upward as shown in FIG. 3, the opposing magnetic poles of the magnets 11a and 11b and the magnetic core 12a
Since the magnetic gap with the left end of the magnet 11a is smaller than that with the right end, the magnetic flux from the opposing magnetic pole passes from the left end to the right end in accordance with the rotational deviation of the magnetic core 12a.
reaches the south pole.

Therefore, a current flows in the wire ring 8a in a predetermined direction according to the change in magnetic flux.

On the other hand, if the cantilever 2 moves downward in the figure,
Since the opposing magnetic pole portion and the right end portion of the magnetic core 12a are closer to each other than the left end portion, the magnetic flux from the opposing magnetic pole portion passes through the magnetic core 12a from its right end portion to its left end portion in accordance with the rotational deviation of the magnetic core 12a, It reaches the S pole of the magnet 11b.

Therefore, a current flows in the opposite direction to the above-mentioned predetermined direction in accordance with the change in the magnetic flux.

FIG. 4 is a side view before assembly, including a partial cross section, of an example of a cartridge body using the power generation structure according to the present invention, in which the same parts as in FIG. 1 are designated by the same reference numerals.

In the figure, a stylus unit consisting of a stylus snap 1, a cantilever 2, a disc-shaped member 3, a string holder 6, etc. is supported by a first case 13 via a damper 5.

First and second wire rings 8a attached to the disc-shaped member 3
and four lead wires (not shown) from 8b are connected to four terminal pins 14, respectively.

A positioning protrusion 15 is formed on the upper surface of the first case 13.

A second case 16 has four external connection terminal pins 17, and has first and second magnet pairs 10a and 10b built therein.

The second case 16 also has four terminal holders 18 and holes 19 electrically connected to the external connection terminal pins 17 in correspondence with the four terminal pins 14 and protrusions 15 of the first case 13. is formed.

Then, the protrusion 15 of the first case 13 is attached to the second case 1.
6 into the hole 19 as shown by the arrow A and fixed by a fixing means (not shown), the first and second cases 13 and 16 are integrated and the first and second wire rings 8a and 8b are fixed.
are arranged to face the opposing magnetic pole portions of the first and second magnet pairs 10a and 10b with a predetermined gap, thereby forming a cartridge body.

As described above, by using the power generation structure according to the present invention, it is possible to provide an MCC stereo cartridge in which the needle can be easily replaced.

As detailed above, according to the MC type cartridge according to the present invention, the magnetic field generating section that supplies magnetic flux to the wire ring that responds to the cantilever is formed by a pair of magnets arranged close to the wire ring so that the same magnetic poles face each other. Since the density of the magnetic flux emitted from the opposing magnetic poles is extremely high, a high density magnetic flux is supplied to this coil, resulting in high power generation efficiency (
, a practically sufficient power generation efficiency can be obtained without using a pole piece, and the weight of the cartridge body can be reduced.

Furthermore, since the wire ring is unevenly distributed at a predetermined distance from the center axis of the cantilever, the required distribution of magnetic flux is small, and the cartridge as a whole can be made compact. Since there is no need to make the magnetic circuit into a large shape surrounding the cantilever, the magnetic circuit can be made smaller, and since the wire ring has a simple shape and can be easily formed, cost reduction and mass production are possible.

Further, since the wire ring can be fixed in a predetermined position after assembling the stylus unit, a high level of skill or technique is not required for the assembly work.

Furthermore, since the vibration system and the magnet can be completely separated structurally, it is possible to easily provide an MCC stereo cartridge that allows the needle to be replaced, which has been considered difficult in the past.

In addition, in the above embodiment, the case where the disc-shaped member 3 is made of a magnetically conductive material is explained, but even if it is made of a material other than a magnetically conductive material, such as plastic, it is possible to obtain a practically sufficient power generation efficiency. It is.

[Brief explanation of the drawing]

Figure 1a is a front view of one embodiment of the MCC stereo cartridge power generation structure according to the present invention, Figure 1b is a side view showing only one channel, Figures 1C and d are illustrations of its operation, and Figure 1.
Figure a is a front view of another embodiment of the MCC stereo cartridge power generation structure according to the present invention, b is a side view showing only one channel, C and d are illustrations of its operation, and Figures 3a and b are An operational explanatory diagram showing still another embodiment of the power generation structure of the MC type cartridge according to the present invention, FIG. It is a diagram. Explanation of symbols of main parts, 2...cantilever,
5... damper, 8a, 8b... wire ring,
9a, 9b. 12 a + 12 b...Magnetic core, 10at1
0b... Magnet pair, 11 a, 1 l b...
····magnet.

Claims (1)

[Scope of Claims] 1. A cantilever, a wire ring that responds to the cantilever, and a pair of magnets that are arranged close to each other so that the same magnetic poles face each other, and whose opposing magnetic poles are arranged opposite to the wire ring with a predetermined gap. A movable wire ring type cartridge, wherein the wire ring is unevenly distributed at a predetermined distance from the central axis of the cantilever. 2. The movable wire ring type car according to claim 1, wherein the center point of the wire ring is within a plane including the boundary surface of the magnet pair. 3. The movable wire ring type cartridge according to claim 1, wherein the wire rings are a pair and are provided at positions substantially perpendicular to each other with respect to the central axis of the cantilever. 4. The movable wire ring type cartridge according to claim 3, wherein there are two pairs of magnets, each of which is arranged independently and close to each of the wire wheels. 5. The movable wire ring type cartridge according to claim 1 or 3, wherein the wire ring is provided so that its central axis is substantially perpendicular to the magnetization line of the magnet pair. 6. The movable wire ring type cartridge according to claim 1 or 3, wherein the wire ring is provided so that its central axis is substantially parallel to the magnetization line of the magnet pair.