JPS58218298A - Moving coil type pickup cartridge - Google Patents

Abstract

PURPOSE:To realize excellent performance and high productivity, by constituting a titled cartridge so that a reproduction output is obtained by moving two moving coils, which are arranged in a magnetic field in accordance with the mechanical oscillation of a needle point. CONSTITUTION:A coil holder 3 is coupled with one end of a cantilever 2 which is fixed with a needle point 1 on its another end. The coil holder 3 is supported by a supporting line 10 projecting backward from the center of a rear surface so that it can freely move, and two moving coils 4 and 5 are fixed on its external peripheral so that a wound coil plain surface is located in a surface perpendicular to the main axis of the cantilever 2. Magnetic gaps 21 and 22 are formed between a front yoke 20 and poles 18 and 19 which are arranged so that they face each other with the poles 18 and 19, which are inserted to the center holes of the said coils 4 and 5, and coils 4 and 5 in-between. A permanent magnet 24 between the front yoke 20 and a rear yoke 23 generates a magnetic field to the gap 21 and 22. If the coils 4 and 5 are moved in the magnetic field, a reproduction output is obtained. Thus, the excellent performance and high productivity can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention has a single stylus tip for tracing record grooves formed substantially at right angles to each other and in which individual signals are recorded. A moving coil type pickup cartridge is constructed such that a reproduction output is obtained from the two moving coils by moving two moving coils arranged in a magnetic field in response to the mechanical vibrations of the moving coil. It is an object of the present invention to provide a device that can obtain basic characteristics such as characteristics, and can be easily assembled and mass-produced.

Further, the objectives of the present invention are as follows.

(1) In particular, by effectively reducing the size and weight of the moving coil part without impairing its performance, the effective mass of the vibrator system can be reduced, resulting in wide-band reproduction characteristics with a high limit frequency for high-frequency reproduction, and high-frequency mechanical To obtain a moving coil type pickup cartridge with low impedance.

(2) A harsh coil pickup cartridge with a low inductance, low direct current resistance generating coil and a high magnetic flux density magnetic circuit with a high concentration of magnetic flux, increasing the output sensitivity to impedance ratio, low noise, and high S/N ratio. Get a and.

(3) With simple shaped coils and coil holders, etc.
To obtain a moving coil type pickup cartridge with high productivity and uniform quality.

(4) To obtain a moving coil type pickup cartridge in which crosstalk can be easily minimized by simple geometric arrangement of coils and magnetic poles.

- To obtain a moving coil type pickup cartridge with little attraction phenomenon due to magnetic material such as a magnetic material and free from adverse effects such as changes in stylus pressure.

(6) To obtain a moving coil type pickup cartridge that can be easily changed into a configuration in which the needle can be replaced by making the vibrator system and a part of the magnetic circuit blockable.

Conventional structure and problems Generally speaking, as a moving coil type pickup cartridge,
The following two methods have been proposed.

(1) A moving coil pickup cartridge disclosed in Japanese Utility Model Publication No. 19879/1979.

(2) A moving coil type pickup cartridge disclosed in Japanese Patent Publication No. 46-5577.

First, as shown in FIGS. 1 to 3, the first car (IJ) disclosed in the above-mentioned Japanese Utility Model Publication No. 40-19879 uses a permanent magnet 101 to connect a yoke piece 102 and a magnetic pole piece 1.
Two coils 105 and 106 are wound directly on the armature 104, which is placed in a DC magnetic field generated between However, this type of moving coil type cartridge has the following drawbacks.

(a) As shown in FIG. 3, it is necessary to wind two coils 105 and 106 around the armature 104, that is, the coil support frame, to which the cantilever 108 having the needle tip 107 is fixed, so the cantilever 108 etc. get in the way. This makes the coil winding work difficult and productivity is severely limited. Also, the coil 106°10 wound around the armature 104
6 is in contact with the damper 109, the damping surface of the armature 104 by the damper 109 does not become a uniform plane, making it difficult to uniformly position and brake the armature 104.

(b) In order to increase the output sensitivity, the armature 104 interposed in the magnetic field is made of a magnetic material, but this increases the effective mass of the vibrator and increases the inductance of the coil, narrowing the reproduction frequency band. Nari, S/N
The ratio becomes worse.

In order to suppress this, the number of turns of the coil is limited, and as a result, the output sensitivity to impedance ratio cannot be increased, resulting in a high S/N.
It is not possible to configure a ratio cartridge.

(c) A uniform DC magnetic field is generated between the magnetic pole piece 103 and the yoke piece 102, and the armature 104 is inserted into the magnetic field, so essentially the yoke piece 102 has one end fixed to the armature 104. A hole 110 is required to pass through the cantilever 108, and the hole 1
It is necessary to insert the cantilever 108 through the cantilever 10 during assembly. For this reason, it is difficult to assemble the cartridge, and it is also extremely difficult to realize a needle exchange structure.

) Since the yoke piece 102 and the magnetic pole piece 103 are very close to the record surface, the yoke piece 102 and the magnetic pole piece 10
The force attracted to a magnetic body such as a turntable due to the leakage of the DC magnetic flux generated between the three positions increases, which tends to cause problems such as changes in stylus pressure. In addition, it is easy to attract iron powder, etc., so protective measures such as a thin rubber film are required.

It has various drawbacks, such as:

On the other hand, the second cartridge disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 46-6577 has two fan-shaped coils 111, 112 with arc-shaped effective coil portions 111a and 112a, as shown in FIGS. 4 and 6. This stereo electrodynamic transducer is fitted into an arc-shaped gap 116 formed at the tips of the magnetic pole pieces 113 and 114, and generates an output to the coil according to the movement of the tip 116. Type cartridges also have the following disadvantages:・That is, (a)
Coils 111, 112. In order to increase the output sensitivity, the effective coil portion 11', -,: a, 112-a is lengthened and fan-shaped. The coil becomes larger. As a result, the mass of the vibrator increases, the effective mass cannot be reduced, the high frequency reproduction limit frequency decreases, the mechanical impedance increases, the reproduction frequency band narrows, and the S/N ratio deteriorates. Furthermore, since the ineffective coil portion coupled to the coil holding member 117 is relatively long, the rigidity of that portion is reduced and harmful resonance is likely to occur. Furthermore, since the two coils are placed very close together, crosstalk problems are likely to occur.

(b) Also, since the coil is large, the winding length becomes long.
The direct current resistance increases, resulting in thermal noise and an increase in root tone due to an increase in equal input impedance with the connected amplifier input stage.

(c) Since the coil is fan-shaped and asymmetrical, it is difficult to manufacture the coil, and attachment to the coil holding member 117 is also very troublesome.

It includes various drawbacks such as.

),.

Purpose of the Invention The present invention is based on the prior art, and in order to eliminate its drawbacks, further research and development has been carried out to create a moving coil that has excellent overall performance, is highly productive, and can be manufactured at low cost. type pickup cartridge.

Structure of the Invention The present invention fixes two circular ring-shaped moving coils to a coil holder to which the other end of the cantilever is fixed, and inserts the moving coils into the magnetic gap between the pole and the yoke. In addition to being configured to obtain a reproduction output according to the movement of the tip of the cantilever, the coil holder and the support wire that supports the ridge are integrally formed of resin, thereby making assembly easier. The vibration fulcrum of the cantilever can be set accurately near the center of the moving coil.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIG. 6 and subsequent drawings. The cartridge of this embodiment is a pickup cartridge for playing back 46-46 stereo records in which two or more independent signals are recorded in the first sound groove.
It employs a moving coil type power generation system in which two independent moving coils vibrate in a DC magnetic field to generate an output voltage.

First, a first embodiment of the present invention will be explained using FIGS. 6 to 10. The structure of a pickup cartridge can be roughly divided into a vibration system and a power generation system, so the following explanation will be made according to these classifications as much as possible. First, we will explain the vibration system.A cantilever 2 with a needle tip 1 fixed to one end is connected to the other end of a coil holder 3 made of synthetic resin in the shape of an 11-disc disk. Two independent circular ring-shaped coils 4 and 6 are arranged so that their planes are located in a plane perpendicular to the main axis of the cantilever 2.
is fixed (see Figure 9). Above two coils 4
, 6 are arranged in the plane so that the respective winding centers a, b and the main axis C of the cantilever 2 are approximately at the vertices of a right-angled isosceles triangle (see FIG. 8). 4a, 6
a indicates the output lead wires of the coils 4 and 6.

Further, to explain the vibration system in more detail using FIG. 10, a cylindrical protrusion 3a is integrally provided on the front surface of the coil holder 3, and the center hole of the cylindrical protrusion 3a is The other end of the cantilever 2 is press-fitted into a through-hole 6 passing through the cantilever in the thickness direction and fixed by adhesive.

Further, above the outer periphery of the coil holder 3, arc-shaped notches 7°7 are provided symmetrically, and the notches 7
7 are provided with coil insertion grooves 8, 8, and the pre-wound circular ring-shaped coils 4, 6 are inserted into these grooves 8, 8 and fixed by adhesive or the like.

As mentioned above, the coil holder 3 has a through hole 6 for coupling the cantilever 2 and coil insertion grooves 8 for fixing the coils 4 and 6, but this coil holder 3 is made of synthetic resin. It can be made alone or made of reinforced plastic including carbon fiber, glass fiber, etc., or light metal such as aluminum. Coils 4 and 6 are 16μ to 40μ
A wire with a diameter of □ is made by winding it into a circular ring shape using a self-melting conductor that has been treated to adhere adhesive to the covered conductor, or a coated conductor and adhesive, but the effective mass of the needle tip and DC resistance In order to make the winding diameter as small as possible, the coil holder 3 is installed with notches 7, 7 formed so as to be as close as possible to the main axis C of the cantilever 2, and fixed firmly with epoxy adhesive or the like. do. If the coil is circular and small, the rigidity can be increased and unnecessary resonance will not occur.

As shown in FIG. 11, a coil support plate 9 having a circular lip 9a is provided integrally with the coil holder 3ti, so that the rib 9
Coil 4 so that a is inserted into the center hole of coils 4 and 6.
, 5, the coils 4, 6 can be easily positioned with respect to the holder 3.

To explain the support structure for supporting such a vibration system, as shown in Fig. 9, there is a pipe-shaped cantilever □ which is press-fitted into the through hole 6 of the coil holder 3 and fixed with adhesive. .) One end of the support wire 1o is fixed using a connector 11, and is inserted into the support pipe 13 with a slight interval 12 and fixed by pressure. Then, a circular ring-shaped damper 14 made of a viscoelastic material such as butyl rubber is sandwiched between the coil holder 3 and the support 16, and the support is inserted into the center hole 16 of the support 16, and the pipe 13 or this support pipe is inserted into the center hole 16 of the support 16. The support wire 1o fixed to the pipe 13 is pulled behind the support 15 to optimally adjust the amount of compression of the damper 14, that is, the damping of the vibration system, and then the screw 1 is tightened to connect the pipe 13 and the support wire 10 to the support 16. The vibration system is supported on the support body 15 so as to be able to freely vibrate. When the vibration system vibrates, the support wire 10
is bent at and near the neck portion 10a located within the cavity 12, and the vibration system moves angularly in any direction using the neck portion 10a as a substantially fulcrum. At this time, the support line 1o is not moved in its longitudinal direction. The neck part 10a
is expected to approximately coincide with a plane passing through the center of the coil 4.6 in the thickness direction. The support pipe 13 and the support line 1o protruding to the rear of the support body 16 may be cut and removed after adjusting the amount of compression of the damper 14 and tightening the screw 17. The front end of the support pipe 13 passes through the center hole of the damper 14 and partially projects into the cavity 12. It should be noted that the prior art related to this vibration support structure is disclosed in Japanese Utility Model Publication No. 51-241, which was invented by the present inventor, and this example utilizes this prior art in an improved form. ing.

Next, a power generation system for outputting an electric signal corresponding to the vibration of the needle tip 1 from the two circular ring-shaped coils 4 and 6 in accordance with the vibration of the vibration system will be explained. is made of a magnetic material, and cylindrical rod-shaped poles 18 and 19, which are inserted into the center holes of the two coils 4 and 5, are integrally formed on the front surface of the support 16. These poles 18.19 are the 8th
As shown in the figure, the coils 4 and 6 are arranged along the winding center axes a and b. In FIG. 8, the pole 18.degree. 19 and the coils 4, 6 are arranged in a concentric relationship. A front yoke 20 is arranged to face the poles 18, 19 with the coils 4 and 6 in between, and a magnetic field is formed between the front yoke 2o and the poles 18, 19.

Air gaps 21,22 are formed. The front yoke 20 and the rear yoke 23 integrally provided on the rear outer periphery of the support body 16 are connected by a permanent magnet 24, and a magnetic field is generated in the magnetic gap 21, 22 by the permanent magnet 24. .

To explain in more detail, two coils 4 and 5 are provided at the lower end of the front yoke 2o, that is, the portion facing the poles 18 and 19.
As shown in FIG. 8, magnetic pole faces 26 and 27 are formed facing each of the inverted V-shaped notches 25, which are substantially perpendicular to the two modulation axes of the record and substantially perpendicular to each other. ing. On the other hand, as described above, the 2
Since two protruding poles 18 and 19 with a circular cross section are arranged so as to penetrate approximately the center of each coil 4.6,
Magnetic pole faces 26 and 27 forming the inverted V-shaped notch 2'6
Seven independent magnetic gaps 21 and 22 are formed between the two. , □＼ In this magnetic gap 21, 22' table, each coil is Output voltages corresponding to the left and right channels are induced. That is, if the needle tip 1 were to vibrate in the direction along the left channel modulation axis in FIG. A certain portion 4b is interlocked to cut the parallel DC magnetic flux, and an electrical output is induced in the coil 4. At this time, the portion 6b of the other coil 6 within the magnetic gap 22 only rotates around the axis R, so the coil 5
The portion 5b does not cut the magnetic flux, and no output is obtained from the coil 6. Conversely, if the needle tip 1 vibrates in the direction along the right channel modulation axis H, no output is obtained from the coil 4, but an electrical output is induced in the coil 6. In this way, left channel signals are generated from coils 4' and 6 in response to the movement of needle tip 1.

The right channel signal sumo wrestler is separated and output.

The power generation system and the vibration system are combined to form a unit as shown in FIG. The moving coil type pickup cartridge of this embodiment is completed by connecting the wires to the four output terminals 29 provided on the rear plate portion of the main body 28.
In the figure, 30 indicates a shield plate, and 31 indicates a screw insertion recess for attaching the cartridge to a head shul (not shown).

The above is the explanation of the cartridge of this embodiment, and a supplementary explanation will be given below. In general, the weight of the cartridge has a large effect on the effective mass (affecting frequency characteristics) of the tone arm system including the cartridge, so the weight of the cartridge should not be unnecessarily large (if it is too large, the reproduction frequency band will be narrowed). The moving coil type pickup cartridge normally uses a sintered magnet as a magnet for generating a magnetic field, which has the disadvantage of being too heavy and narrowing the reproduction frequency band. In order to avoid this, in this example, a rare earth cobalt magnet such as a samarium cobalt magnet, which features high coercive force and high (BH) maw, is used to obtain a strong gap magnetic field, and the magnet is made smaller and lighter. There is. Of course, magnets made of other materials may be used without any problem.

The front yoke 20, the rear yoke 23, and the support body 16 having the poles 18 and 19, which constitute the magnetic circuit, are made of a magnetic material such as electromagnetic pure iron, permendur, or ferrite, which has a high saturation magnetic flux density and high magnetic permeability. However, it can also be manufactured using a sintering method in which similar materials are pulverized, molded, and sintered.

In particular, the support 1 with the rear yoke 23 and the poles 18, 19
By integrally molding and manufacturing 6 using a sintering method, assembly accuracy can be significantly improved and the number of man-hours can be reduced. The same applies to the front yoke 20, but it goes without saying that it may be manufactured using other methods such as press working.

By the way, in the first embodiment described so far, the support body 16 that supports the vibration system forms part of the magnetic line that generates a magnetic field in the magnetic gap between the poles 18 and 19 and the front yoke 20. Therefore, at least the portion of the support 15 that connects the poles 18, 19 and the rear yoke 23 must be made of a magnetic material. However, in the second embodiment shown in FIGS. 12 and 13, Even if the support body 16 is made of a non-magnetic material such as synthetic resin, it does not interfere with the reproducing operation.

The second embodiment will be described with reference to FIGS. 12 and 13. The base 3 protrudes forward on the front side of the lower end of the rear yoke 23.
2 is integrally formed with the rear yoke 23 by a sintering method, and the base 3
A circular groove 34.35 is provided on the circumference of the center through hole 33 of No. 2, and a cylindrical support 36 and a pole pin 37.38 made of magnetic or non-magnetic material are installed in these holes 33 and grooves 34.36. Each is inserted and fixed to form one magnetic pole part. In this case, the support pipe 13 connected to the vibration system described above is inserted into the center hole 16 of the support 36, and after adjusting the amount of compression of the damper 14, it is fixed with screws 17 to assemble the vibration system. 36 into the hole 33 of the base 32 and fix it with the screw 39, assembly can be facilitated 4.1
：・、、。

□ By the way, the pickup for playing stereo records, j...
In order to improve the separation characteristics between the left and right channel outputs, which is an important performance for a 111 dob cartridge, one important factor is the geometrical arrangement of the vibration system. That is, as shown in Fig. 8, it is necessary to construct the coil so that the line connecting the center of the coils 4 and 6 and the needle tip 1 coincides with the modulation axis of the record groove, or the direction of the R axis. 46° to each other, 9° to each other
They must be placed at an angle of 0°. To explain the operation in this case, the needle tip is modulated to the left by 46 degrees, causing the axis to R.
When moving along the effective coil portion 4a of the coil 4
The coil 6 moves in parallel in the front-back direction and generates an output voltage within the magnetic gap 21, but the coil 6 rotates around the axis H in the plane of the coil and therefore does not generate an output voltage. Therefore, good separation of left and right outputs is achieved. Further, when the needle tip moves by vertical modulation, outputs are generated in the coils 4 and 5 in the same phase and at the same level. Furthermore, in the case of horizontal modulation, the coils 4 and 6 move back and forth in opposite directions, so they produce outputs of the same level in opposite phases. Therefore, one coil is connected to the other coil so that the phase is reversed.

Another important factor is the shape of the notch 26 of the front yoke 2o. In other words, if the shape of the notch 26 is set so that the direction in which the density of the magnetic flux generated between the protruding magnetic poles 18 and 19 and the front wok 2o is maximum coincides with the modulation axis direction of the record, the left and right channels will be Separation characteristics and channel separation can be improved. For example, the seventh
By providing a recess 4o for separating the magnetic poles as shown by dotted lines in FIG. 8, it is possible to adjust the magnetic flux component in the vertical direction (vertical direction in FIG. Magnetic flux component and horizontal direction (horizontal direction in Figure 8)
The maximum magnetic flux density direction, which is the vector sum of the magnetic flux components, can be made to perfectly match the modulation axis direction of the record, and the minimum point of crosstalk can be realized. In order to make this easier to understand, this will be explained with reference to FIG. coil 4
, 6, the more the magnetic flux component in the horizontal direction increases, so the direction of the maximum magnetic flux, which is the vector sum of the vertical component and the horizontal component, is the direction of the modulation axis of the record, which coincides with R. It is possible to do so.

Next, another example of the support wire 10 portion forming the vibration fulcrum of the vibration system will be described with reference to FIGS. 14 and 16.
In the example shown in FIG. 4, the coil holder 3 and the support wire 10 are integrally molded from synthetic resin, and the support pipe 13 is attached and fixed to the support wire 1o. In the example shown in FIG. 16, a recess 41 is provided on the rear surface of the holder 3 in order to bring the flexible neck portion 10a, which serves as a vibration fulcrum, as close to the surface containing the coils 4 and 6 as possible, and the front end of the support knob 13 is aligned with the recess 41. The department is being invaded.

The latter structure is almost the same as the structure of the first embodiment shown in FIG.

Next, FIG. 16 shows a third embodiment of a moving coil type pickup cartridge in which the needle can be replaced. In the cartridge of Conventional Example 1 explained at the beginning, as shown in FIG. In addition, the yoke piece 102 requires a hole that passes through the cantilever 108, making it extremely difficult to replace the needle.In addition, since the magnetic pole is close to the record surface, leakage magnetic flux attracts iron particles. A thin film is required. If the turntable still contains magnetic material, the cartridge is likely to be attracted, causing problems such as changes in stylus pressure. However, according to the cartridge of this embodiment, the yoke 2
There is no need for a hole to penetrate the cantilever 2 at the tip of the cantilever 2,
Since it opens downward, it has the advantage that the needle can be replaced easily, and since the magnetic pole is separated from the record surface, the above-mentioned suction phenomenon does not occur, and there is no need for a dustproof thin film.

Therefore, the structure in which the needle can be replaced will be explained using FIG. 16. When assembling the vibration system, the output lead wires 4a and 15a of the coil 4.6 are housed in the slit groove 42 provided on the outer periphery of the support 36 and supported. Four terminal pins 43 are attached to the rear end of the body 36.
Fix the needle terminal part 44 and connect the lead wires 4m and 5.
Connect a to the terminal pin 43. This support 11 is the base 3
2 into the hole 33. On the other hand, the cartridge body 28
There are four jacks 46 into which the terminal pins 43 are press-fitted into a terminal plate 45 formed in
A conductive foil 47 is provided to be electrically connected, and the conductive foil 47 and the output terminal 29 of the cartridge are connected by a lead wire 48''T3.

In order to facilitate needle exchange, the support body 36 is integrated with a needle holder 49 made of synthetic resin, light alloy, etc., and this holder 49 is attached to the main body 28 with a fixing screw 5o.

When replacing the needle, the entire vibration system including the needle tip 1 can be easily replaced by loosening the fixing screw 60 and pulling out the support body 36 integrated with the needle holder 49 forward.

Note that the shape of the vocal pole surfaces 26 and 27 of the yoke 2o is in the form of an arc concentric with the center of the poles 18 and 19, as shown in FIG. 17, so that the effective coil portion is relatively longer.
A structure that increases the voltage may be used. ″□″
- Effects of the invention 1゛.

□1 As explained above, the moving coil type pickup cartridge of the present invention has a moving coil independently formed into a simple circular ring shape, fixed to a coil holder, and a pole inserted into the center hole of the coil. A magnetic gap is formed between the pole and the yoke facing the pole.
The coil is moved in a DC magnetic field generated within this magnetic gap to generate output.
In particular, by making the movable coil into a circular ring shape and generating a magnetic field in the radial direction of this coil, we can achieve the objectives (1) to (6) mentioned at the beginning, namely (1) a wide band with a high high-frequency reproduction limit frequency; To obtain a moving coil type pickup cartridge having reproduction characteristics and low high frequency mechanical impedance; (2) To obtain a moving coil type pickup cartridge having a large output sensitivity to impedance ratio, low noise, and high S/N ratio; 3) To obtain a moving coil type pickup cartridge with high productivity and uniform quality; (4) To obtain a moving coil type pickup cartridge in which crosstalk can be easily minimized by a simple geometric arrangement of coils and magnetic poles. (6) To obtain a moving coil type pickup cartridge with less leakage magnetic flux from a DC magnetic circuit, less attraction phenomenon due to magnetic materials such as a turntable, and no adverse effects such as changes in stylus pressure, (6) Vibrator system and Some magnetic circuits can be blocked,
To provide a moving coil type pickup cartridge that is unprecedented in the past and has excellent performance and ease of assembly, which satisfies the requirements of obtaining a moving coil type pickup cartridge that can be easily changed to a configuration in which the needle can be replaced. I can do it.

In other words, from a performance standpoint, it is possible to expand the reproduction frequency band without reducing the S/N ratio, and from an assemblability standpoint, the moving coil can be manufactured separately from the coil holder. Since the coil is a simple circular shape, high-speed winding work is easy and quality can be easily maintained. Automatic machines can be introduced for mass production, and in this case, the obtained cartridge performance can be easily achieved. The variation in ゛ can also be greatly reduced.

Moreover, in the present invention, the coil holder and the support wire protruding rearward from the center of the rear surface of the coil holder are integrally molded with resin, so the coil holder and the support wire are provided separately and attached by adhesive etc. The number of assembly steps can be significantly reduced compared to those that are combined. In addition, if a recess is provided in the center of the rear surface of the coil holder, and the support wire protrudes from the bottom of this recess, and the front end of the support pipe that holds the support wire is partially inserted into the recess, the bottom of the four parts and the support pipe A flexible neck portion can be set on the support line between the front ends of the device to serve as a vibration fulcrum.

Therefore, the fulcrum of the vibrator system can be brought as close as possible to the plane containing the moving coil, which results in a smaller effective mass of the vibrator system and a sufficiently high high-frequency reproduction limit frequency.
High-frequency mechanical impedance can be made sufficiently small.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an example of a conventional moving coil type pickup car 1° cartridge, Fig. 2 is a side sectional view of the same main part, Fig. 3 is a front view of the same coil part, and Fig. 4 is a conventional moving coil type pickup car. A side view showing another example of the moving coil pickup cartridge, FIG. 6 is a front view of the same coil portion, and FIG. 6 is a side sectional view of the moving coil pickup cartridge according to the first embodiment of the present invention. Fig. 7 is a perspective view of the same main part, Fig. 8 is a front view of the main part, Fig. 9 is a side sectional view of the main part, Fig. 10 is an exploded perspective view of the same vibration system, and Fig. 11 is the same vibration system. FIG. 12 is a side sectional view of a main part of a moving coil type pickup cartridge according to a second embodiment of the present invention, FIG. 13 is a partially exploded perspective view of the same main part,
14 and 15 are side sectional views showing other examples of the support structure of the vibration system, FIG. 16 is a side sectional view of a moving coil type pickup cartridge according to the third embodiment of the present invention, and FIG.
The figure is a front view of the fourth embodiment, and FIG. 18 is an explanatory diagram for explaining the principle of matching the maximum magnetic flux direction with the modulation axis direction of the record. 1...needle tip, number striking...cantilever, 3...
...Coil halter 14,6...Movable coil/
lz, 18.19...Ponope29...
・Yoke, 21, 22・Mountain...Magnetic gap, 24...
····permanent magnet. Name of agent: Toshio Nakao, 1st of the 4 Bento speakers
Figure 2 Figure 3 Figure 4 Figure 13 Figure 5 Figure 6 Figure 7 Figure 10 Figure 12, j6. 3D Figure 13 Figure 14 Figure 15 Figure 16 Figure 17

Claims (2)

[Claims] (1) A coil holder and a support line protruding rearward from the center of the rear surface of this coil holder are integrally molded with resin, and the other end of the cantilever with the needle tip fixed to one end is fixed to the above coil holder. The coil holder is movably supported by the support wire, and the movable coil is formed into a circular ring shape, and the two circular ring-shaped movable coils are attached to the outer periphery of the coil holder, and the winding plane ice is attached to the axis of the cantilever. a pole and a movable coil that are fixed substantially perpendicular to the direction and such that a substantially right-angled isosceles triangle is formed by the center of the winding and the cantilever, and that are penetrated through the center hole of the circular ring-shaped movable coil; A magnetic gap is formed between the pole and the yoke facing the pole, and a permanent magnet is interposed in the line that magnetically connects the pole and the yoke to generate a magnetic field in the magnetic gap. A moving coil pickup cartridge configured to obtain reproduction output from the moving coil disposed within the magnetic gap in response to mechanical vibrations of the pickup cartridge. (2) A recess is provided in the center of the rear surface of the coil holder, and support wires are protruded from the bottom of the four parts. 2. The moving coil type pickup cartridge according to claim 1, wherein the front end of the support pipe that holds the support wire partially enters the recess.