JPS5847780B2 - Signal pickup device for rotating information recording medium playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal pickup device for a reproducing device for a rotating information recording medium, such as a video disk reproducing device, and in particular for picking up information tracks on a rotating information recording medium by a scanner provided on the free end side of a cantilever. The present invention relates to an improvement in a signal pickup device that extracts an information signal by tracking and scanning, and more specifically, tracking control that causes a scanner to follow an information track and displace it in a direction perpendicular to the tangential direction of the information track; In addition, the driving force for each of the above-mentioned displacements is generated over almost the entire cantilever that performs jitter compensation to displace the scanning element in the tangential direction of the information track, thereby increasing the efficiency of each of the above-mentioned controls,
Furthermore, it is an object of the present invention to provide a signal pickup device with high precision and a wide control range by increasing the rigidity of the cantilever in the tracking direction (direction perpendicular to the tangential direction of the information track).

The present applicant previously published Japanese Patent Application No. 51-123285 (Japanese Unexamined Patent Publication No. 51-123285) as a device that can perform tracking control and jitter compensation in a so-called video disc playback device.
No. 3-48501) proposed a "cantilever device for signal tracking in a rotating recording medium reproducing device."

This apparatus is constructed as shown in FIGS. 1 and 2.

That is, the cantilever 1 has a damper 2 on its base end side.
is supported by a rubber membrane support part 3, and a reproducing needle 4 attached to the free end side is in contact with an information recording disk 5.

Further, on the base end side of the cantilever 1, a pair of magnet pieces 6,
7, it is coupled to a movable shaft 10 of an arm stretcher 9 provided within a cartridge case 8.

The permanent magnet 11 is supported by a base 12, and the cantilever 1
is placed opposite.

An extremely thin conducting wire 13 is attached to the area of the cantilever 1 facing the permanent magnet 11.

Both ends of the conductor 13 are connected to connectors 14a and 1 on the base 12.
4b, and a lead wire 15 drawn out from the regenerated needle 4 is connected to a connector 16.

In the device configured as described above, by passing a tracking control current through the conductive wire 13 attached to the cantilever 1, the conductive wire 13, that is, the cantilever 1, is driven horizontally by the action of the magnetic field from the permanent magnet 11, and the cantilever 1 is moved horizontally. The playback needle 4 attached to the free end side moves over the information track of the information recording disk 5 in a direction perpendicular to its tangential direction (
Tracking control is performed by displacing in the direction of arrow A).

Furthermore, by appropriately operating the arm stretcher 9, the cantilever 1 is displaced in its axial direction, and the regenerated needle 4
is displaced in the tangential direction of the information track (in the direction of arrow B) to perform jitter compensation.

Although the above-described device is somewhat satisfactory in terms of performance, it has the following problems due to its structure.

■ Attach an extremely thin conductive wire (tenon diameter 18 μm) 13 to the cantilever 1, and connect both ends to the connector 14a,
14b, making assembly difficult.

■ Because the conductor 13 is extremely thin so as not to interfere with the movement of the cantilever 1, it is difficult to supply large amounts of electric power.
In order to horizontally displace the damper 2 as much as necessary, it becomes necessary to reduce the horizontal spring constant of the damper 2 and the moment of inertia of the cantilever itself.

In this case, tracking errors are likely to occur due to uneven traces on the information recording disk, vibrations caused by the reproducing device itself, or external vibrations applied from the outside.

(2) Since the conducting wire 13 is more flexible than the cantilever 1, the conducting wire 13 oscillates in a mode different from that of the cantilever 1 and interferes with tracking control.

(2) Since there is only one conducting wire 13 in the magnetic field and it is short, sufficient displacement force for tracking control cannot be obtained, and the amplitude becomes small.

(2) The distance between the cantilever 1 and the permanent magnet 11 varies due to the surface run-out of the information recording disk or the difference in height of the attached information recording disk, and the linearity gain of the tracking control fluctuates.

(2) Since the lead wire 15 for signal detection and the conductor wire 13 for tracking control are close to each other, mutual guidance occurs, which deteriorates signal reproduction characteristics and tracking control performance.

■ Since the driving force for tracking control is obtained by the leakage magnetic flux of one pole along the conductor 13 of the permanent magnet 11 and the intersection of the conductor 13, the driving efficiency and driving force are small (first
(see figure).

(2) Since the driving force is small, it is necessary to make the cantilever 1 lighter, that is, thinner, and the rigidity of the cantilever itself is lower, making it impossible to perform highly accurate tracking control.

(2) If the arm stretcher 9 is not installed accurately, the jitter compensation operation will increase the tracking error.

Therefore, it is necessary to attach the arm stretcher 9 fairly accurately, making assembly difficult.

The present invention provides a device that solves the above problems, and embodiments thereof will be described below with reference to the drawings.

FIG. 3 is an exploded perspective view of the main parts of the signal pickup device of the present invention, and the reference numeral 21 indicates a cantilever 22 formed of a conductive plate material such as aluminum. This arm is made of an insulating material such as plastic and is insulated against signals and holds the reproduction needle 23 at a predetermined distance from the cantilever 21.

Reference numeral 24 denotes an elastic body such as rubber that supports the swinging point of the cantilever 21, and its both ends are stretched over both side walls of the cartridge case 25 shown in FIG.

The cantilever 21 is bifurcated, or in other words, U-shaped. Lead wires 26 and 27 are connected to the opening ends of the cantilever 21, and tracking control signals are applied to the cantilever 21 from the outside via the lead wires 26 and 27. supply

In addition, the permanent magnet 28 is placed close to the upper surface of the cantilever 21 without contacting it with a magnetic piece 29 having a high magnetic permeability.
A direct current magnetic field generating member having an elongated U-shaped cross section and configured by sandwiching the magnetic material pieces 29 and 30 between the cantilever 21 and the lower end of each of the magnetic pieces 29 and 30 is arranged so as to face the portion 21at2ib of the cantilever 21 through which the tracking control signal current flows. .

Further, in close proximity to the lower surface of the cantilever 21 without contacting it, as shown in FIG. It is arranged as follows.

FIG. 4 is a diagram showing the opposing positional relationship between the permanent magnet 28, the DC magnetic field generating member consisting of the magnetic pieces 29 and 30, the cantilever 21, and the magnetic plate 31.
The lines of magnetic force coming out from the N pole of the forgetful body piece 29 come out from the lower end of the forgettable piece 29 in the direction of arrow A, flow through the magnetic plate 31 in the direction of arrow B, pass through the lower end of the magnetic piece 30, flow in the direction of arrow C, and become permanent. magnet 28
A DC magnetic circuit is constructed that returns to the S pole of the

Therefore, as shown in FIG.
When a current is applied to the cantilever 21 in the direction of the arrow D through the cantilever 7, the cantilever 21 receives a force in the direction of the arrow E due to the action of this current and the magnetic lines of force.

That is, the cantilever 21 is rotationally displaced from the state a to the state b in FIG. 5 by bending the elastic body 24.

Therefore, the reproducing needle 23 can move in a direction perpendicular to the tangential direction of the information track on the information recording disk 32 and follow a predetermined information track.

FIG. 6 is an exploded perspective view of a specific example of this signal pickup device, showing the vertical swing fulcrum of the cantilever 21 that follows the surface vibration of the information recording disk 32 and the horizontal rotation fulcrum in the tracking direction. The elastic body 24 attached to the rear end is made thick at both ends 24a, 24a' so that it can be suspended by engaging notches 25a in both side walls 25d of the cartridge case 25 made of a non-magnetic material. be.

33 is a frame-shaped damper made of an elastic material attached to the upper surface of the tip of the cantilever 21 and the lower surface of the top plate 25e of the cartridge case 25; The needle 23,
The information recording disk 32 is pressed with a predetermined pressure, and an appropriate spring constant is given to the rotational movement of the cantilever 21 in the tracking direction.

A metal ribbon wire 34 is used to send the signal picked up by the reproduction needle 23 to a signal detector to be described later, and its upper end is attached to the lower surface of the top plate 25e of the cartridge case 25.

A notch 25b at the front of the cartridge case 25 is a notch into which a center conductor of a signal detector to be described later is inserted.

The magnetic plate 31, which is disposed close to and not in contact with the lower surface of the cantilever 21, is attached to the cartridge case 25.
It is attached to the lower surface of the cartridge case 25 and is integrated with the cartridge case 25.

A hole 25c provided in the top plate of the cartridge case 25 is attached to a non-metallic rotating member which will be described later.
1 is fitted as described below so that it can be placed close to the top surface of the cantilever 21 without contacting it, and the cartridge case 25 is attached thereto.

Reference numerals 35 and 36 denote contacts that are attached to the top plate 25e of the cartridge case 25, extend to the bottom surface thereof, and are connected to the lead wires 26 and 27.
When 5 is attached to a rotating member to be described later, it is connected to a tracking control signal circuit (not shown).

FIG. 7 is a longitudinal sectional side view of the cartridge case 25 with the above-described components attached to the signal pickup head (signal detector) 37. It is formed on a metal body constituting a coaxial resonator having a
0 is closed and a set screw 41 provided thereon is screwed into a screw hole 42 provided on the top surface of the signal pickup head 37, thereby closing the top opening.

A non-metallic rotating member 43 that can rotate coaxially with the shaft 39 is provided below the upper lid 40, and this rotating member 43 is connected to a leaf spring 44 fixed to the lower surface of the upper lid 40. As a result, it is pushed in a direction away from the top cover 40.

The rotation of the rotation member 43 is limited by the rear end (the upper right end in FIG. 7) coming into contact with the lower surface of the upper lid 40.

Further, the permanent magnet 28 is attached to the lower surface of the rotating member 43.
, a DC magnetic field generating member M1 made of magnetic pieces 29 and 30 is fixed.

Cartridge case 2 incorporating the cantilever 21
The hole 25c drilled in the top plate 25e of No. 5 is connected to the rotating member 4.
When fitted from below to the DC magnetic field generating member M0 fixed to the lower surface of the cartridge case 25, the magnetic plate 31 attached to the lower surface of the cartridge case 25 becomes the magnetic pieces 29, 30 that intercept the DC magnetic field generating member M1. , and the cartridge case 25 is locked at a position where it comes into contact with the lower surface of the rotating member 43 .

At this time, a predetermined gap is provided between the lower ends of the magnetic pieces 29, 30 and the upper surface of the magnetic plate 31, and the cantilever 21 can move within a predetermined range within the gap. There is.

Further, when the cartridge case 25 is attached as described above, the contacts 35 and 36 (the contact 36 is not shown in FIG. 7) provided on the top plate 25e of the cartridge case 25 are connected to the rotating member 43. Mounted leaf spring contact 4
5, and a tracking control signal current from a tracking control signal generation circuit (not shown) is applied to the cantilever 21.
connected to be supplied to the

When the rotating member 43 to which the cartridge case 25 is attached and the upper lid 40 are closed as described above, the central conductor 3
8 relatively enters the front notch 25b of the cartridge case 25 and contacts the metal ribbon wire 34,
Further, the regenerating needle 23 and the center conductor 38 are completely connected to each other via the metal ribbon wire 34 by being pressed by the displacement of the leaf spring 44 .

Reference numeral 46 denotes a lever for pushing up the cartridge case 25 and the rotating member 43. As shown in FIG. The surface of the information recording disk 32 is brought into contact and the signal can be picked up.

When the lever 46 is rotated counterclockwise by the traction operation of the traction rod 47, the force grip case 25 and the rotation member 43 bend the plate spring 44 and move upward a little.
The reproducing needle 23 is moved away from the information recording disk 32.

Note that by rotating the adjustment screw 48 in FIG. 1, the center conductor 38 is bent, and the cartridge case 25
Then, the height position of the rotating member 43 changes, and the contact pressure of the reproduction needle 23 against the information recording disk 32 is adjusted.

In addition, as another example of a cantilever, a conductive plate may be formed into an elongated ring shape, and a conductor may be insulated on the annular surface and fixed in a coil shape; Alternatively, an insulating plate may be formed into an elongated annular shape, a conductor may be fixed in a coil shape to one annular surface, and the conductor may be short-circuited to the other annular surface. It may be fixed in a ring shape, and furthermore,
The conductor may be formed by winding the conductor into an elongated ring shape in a plane and solidifying it with resin.

The above describes a signal pickup device that performs only tracking control, but an outline of a signal pickup device having a cantilever having a jitter compensation function and examples of cantilevers will be described below.

FIG. 8 is an exploded perspective view of the main part. A playback needle 23 is fixed to the tip via an insulating arm 22, and is reciprocated at least once in the tangential direction of the information track of the information recording disk to control tracking. A cantilever member 21' formed into a bifurcated shape or a U-shape by a conductor plate material such as aluminum so as to form the respective conductors 21a, 2lb through which signal current flows, and this cantilever member 21' The reproducing needle 23 is attached to the rear end side where the reproducing needle 23 is not attached, insulated from the cantilever member 21', and reciprocates at least once in a direction perpendicular to the tangential direction of the information track to generate a jitter compensation signal. In other words, a bifurcated shape is formed by conductor plates such as aluminum to form conductors 2 1 c and 2 1 d through which current flows.
A cantilever 21 is constituted by a cantilever member 21'' shaped like a letter.

A DC magnetic field generating member M1 configured as described above is arranged on the upper surface of this cantilever member 21', and a permanent magnet 28' is disposed on the upper surface of the cantilever member 21'' similarly to the DC magnetic field generating member M1. High permeability magnetic piece 29', 3
Direct current magnetic field generating members M2 configured by sandwiching them at 0' are arranged.

The magnetic plate 31 extends from the lower surface of the cantilever member 21' to the lower surface of the cantilever member 21''.

A tracking control signal current is supplied to the cantilever member 21' via lead wires 26 and 27 to perform tracking control, and a tracking control signal current is supplied to the cantilever member 21'' via lead wires 49 and 50. A jitter compensation signal current is supplied from a jitter compensation signal generation circuit (not shown), and the cantilever member 21'' is moved in the direction of arrow F by the action of the magnetic field of the DC magnetic field generation member M2.
That is, the cantilever member 21' is also moved in the same direction to move the reproducing needle 23 in the tangential direction of the information track of the information recording disk 32 to perform jitter compensation.

This jitter compensation is performed simultaneously with tracking control.

9 to 11A and 11B show examples of cantilevers having a jitter compensation function, respectively.

That is, FIG. 9 shows the cantilever member 2 shown in FIG.
1' and the cantilever member 21'' are each formed by winding a thin aluminum wire into a flat rectangular coil shape and solidifying it by impregnating it with resin such as plastic.
8 to form a cantilever 21.

In this way, since the number of turns of the coil can be increased, a large control output can be obtained for each coil, and lead wires for supplying each control signal can be integrally provided.

As shown in FIG. 10, the cantilever 21 is formed into a T-shape having a predetermined width using an aluminum plate or the like, and a conductive annular band 21e is cut through the width to reduce mass. , 21f, and this conductive annular band 2 1
A tracking control coil and a jitter compensation coil may be attached insulated to the surfaces of e and 2 1 f.

In this case, conductive annular bands 2 1 e , 2 1 f
Since it is a short ring that moves in a magnetic field, it performs an electromagnetic braking effect on the movement of the cantilever, improving tracking control and jitter compensation operation.

This short ring is effective for high impedance cantilevers with many coils wound around them.

In addition, as shown in FIGS. 11A and 11H, the cantilever 21 is made of a thin insulating board (printed circuit board) made of glass epoxy material, etc., and has a T-shape with a predetermined width, and is designed to reduce the mass within that width. A hole 21gt21h is provided to form a shape in which elongated insulating annular bands are connected in a T-shape, and a coil-shaped conductive pattern 51 for flowing a tracking control signal current and a jitter compensation signal current are formed on the surface thereof. A coil-shaped conductive pattern 52 is provided on each side, and conductive patterns 53 and 54 are provided on the back side to form a short ring to perform the same function as that shown in FIG. 10. Terminals 5 for sending respective signals to the conductive patterns 51 and 52
3, 54, 55, and 56 are provided.

57 is the tip of a cantilever corresponding to the arm 22 shown in FIG. 3, and a regeneration needle 23 is further provided at the tip.

This cantilever 21 also provides the same effects as explained with reference to FIG. 10 above.

Note that since the operation of the coaxial resonator 37 is already known, a description thereof will be omitted.

This invention is configured as described above, and includes tracking control for causing a scanner such as a reproducing needle to follow an information track of a rotating information recording medium and moving in a direction perpendicular to the tangential direction of the information track, and a scanner such as a reproducing needle. The cantilever, which performs jitter compensation by moving in the tangential direction of the information track, generates the driving force for each of the above movements over almost its entire length, increasing the efficiency of each of the above controls,
Furthermore, the rigidity of the cantilever in the tracking direction, that is, the direction perpendicular to the tangential direction of the information track is increased, and a signal pickup device with high precision and a wide control range can be obtained.

In addition, the magnetic circuit of this signal pickup device includes a permanent magnet, a high magnetic permeability magnetic pole piece that holds both poles of the permanent magnet, and a high magnetic permeability magnetic pole piece that is placed with a predetermined space between the end faces of these two magnetic pole pieces. Since the cantilever is interposed in the space between the end faces of both magnetic pole pieces and the magnetic plate, the magnetic circuit becomes a closed circuit and the leakage magnetic flux is extremely small. Magnetic flux does not act on the lead wires that supply the respective control signal currents, and therefore the lead wires are driven without adversely affecting the drive of the cantilever, and both tracking control and jitter compensation operations are accurate. .

Further, since no lead wire is connected to the tip end side where the cantilever is provided with the scanning element, where the cantilever moves widely, there are few factors that disturb the movement of the cantilever.

Further, since the portion of the conductor where the driving force of the cantilever where the magnetic fluxes intersect is at least twice that of the conventional example shown in FIGS. 1 and 2, one driving force is large.

In addition, since the magnetic flux density in the space between the magnetic plate and the end faces of the two magnetic pole pieces that sandwich the two poles of the permanent magnet is almost uniform, the gain linearity of the control system changes due to changes in the vertical position of the cantilever. There are few.

In addition, jitter compensation also changes the part where the driving force is obtained.
Since it is provided integrally with the cantilever in the same way as the part that obtains one driving force for tracking control, its structure is simple and highly accurate.

In addition, the permanent magnet that interacts with the cantilever and the magnetic pole pieces that sandwich both of its magnetic poles are fixed to the main body of the signal pickup device, and the cartridge case containing the cantilever is removably attached to this, making it easy to replace the cantilever. In some cases, the direct current magnetic field generating member made of an expensive permanent magnet or the like can be left as is and replaced together with the inexpensive cartridge case having a cantilever, which is advantageous in terms of cost.

Additionally, the cartridge case with this cantilever can be installed and replaced very easily because the magnetic plate on the bottom surface of the cartridge case is attracted to the permanent magnet fixed to the main body of the signal pickup device. It is certain.

In addition, regarding the cantilever itself, which is the main part of the signal pickup device, the cantilever and the conductor through which each control current flows can be easily fabricated as one body, or the conductor can be provided in a coil shape to control each control. A device with a large driving force can be easily made, a short ring for braking the cantilever can be easily installed, and the part that holds the scanner can also be made integrally with the tip of the cantilever. .

In addition, if the cantilever is made of an insulating plate such as a thin printed circuit board and a conductor is printed on the surface of the cantilever, the cantilever will be With appropriate flexibility and vibration damping properties, it is possible to reduce dynamic fluctuations in the contact pressure of the scanning element, prevent wear of the scanning element, and reduce fluctuations in the detected signal.

Moreover, since the cantilever has a flat plate shape, the rigidity of the cantilever in the tracking direction is sufficiently high, and the tracking accuracy is not inferior.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing an outline of a signal pickup device of a conventional rotating information recording medium reproducing device, and Figure 3 and the following diagrams show a signal pickup device of the present invention. FIG. 4 is an exploded perspective view showing the relationship between the cantilever and the magnetic circuit. FIG. Figure γ is a longitudinal cross-sectional side view of the cartridge case with a built-in cantilever attached to the signal pickup head, Figure 8 is an exploded perspective view of the signal pickup device with tracking control and jitter compensation functions, and Figures 9- FIGS. 11A and 11B are diagrams showing examples of cantilevers. 21... Cantilever 23... Regeneration needle which is a scanner, 24... Elastic body supporting the cantilever on the cartridge case, 25... Cartridge case, 28, 28'... Permanent magnet, 29, 29', 30, 30'... Magnetic pole piece, 3
1...Magnetic plate, 32...Information recording disk, 33...Damper with cantilever supported on cartridge case 34...Reproducing needle and signal detector A metal ribbon wire connecting the two, 37... A signal pickup head, which is a signal detector, 38...
・Center conductor, 40...Top lid, 43...
Rotating member to which DC magnetic field generating member is fixed, 51, 52.
...Coil-shaped conductive pattern, 53, 54...
・・・Short ring-shaped conductive pattern, MI, M2・
...DC magnetic field generating member.

Claims (1)

[Claims] 1. In a device that reproduces an information signal by relatively scanning an information track of a rotating information recording medium with a scanner provided on a cantilever, the scanner is fixed at one end and the information track is scanned in the tangential direction of the information track. a flat cantilever disposed on the surface of the rotating information recording medium and supported so as to be vertically swingable and horizontally rotatable; , DC magnetic field generating members arranged so that lines of magnetic force in opposite directions act on the portions of the conductors in the cantilever in which control currents flow in mutually opposite directions in a direction substantially perpendicular to the plane of the cantilever. . A signal pickup device for a rotary information recording medium reproducing device, wherein the cantilever is horizontally driven in a direction perpendicular to a tangential direction of the information track in accordance with the tracking control signal current. 2. A signal pickup device for a rotating information recording medium reproducing device, in which a conductive plate is formed into a bifurcated shape as the cantilever according to claim 1. 3. A signal pickup device for a rotating information recording medium reproducing device, in which a conductive plate is formed into an elongated annular shape, and a conductor is insulated and fixed to the annular surface in the form of a coil, as the cantilever according to claim 1. 4. A signal pickup device for a rotary information recording medium reproducing device, as the cantilever according to claim 1, in which an insulating plate is formed into an elongated annular shape, and a conductor is fixed in a coil shape to one annular surface of the insulating plate. 5. As a cantilever according to claim 1, an insulating plate is formed into an elongated annular shape, a conductor is fixed in a coil shape to one annular surface, and a conductor is fixed in a short ring shape to the other annular surface. A signal pickup device for a rotating information recording medium reproducing device fixed to a rotary information recording medium. 6. A signal pickup device for a rotary information recording medium reproducing device, in which the cantilever according to claim 1 is formed by winding a conductor into an elongated ring shape in a plane and solidifying it with resin. 7 In a device that reproduces an information signal by relatively scanning an information track of a rotating information recording medium with a scanner provided on a cantilever, the scanner is fixed to one end and is reciprocated at least once in the tangential direction of the information track. and a conductor through which a tracking control signal current flows, and on the other end side where the scanner is not attached, at least one conductor insulated from the conductor and extending in a direction perpendicular to the tangential direction of the information track. A flat cantilever, which is disposed on the surface of a rotating information recording medium and supported so as to be vertically swingable and horizontally rotatable, has respective conductors through which a jitter compensation signal current flows back and forth more than once; a DC magnetic field generating member disposed so that lines of magnetic force in opposite directions act on each of the conductor portions through which the tracking control signal current flows in a direction substantially perpendicular to the plane of the cantilever; and the jitter compensation member included in the cantilever. Another direct current magnetic field generating member is arranged so that lines of magnetic force in opposite directions act on the portion of each conductor through which the signal current flows, in a direction substantially perpendicular to the plane of the cantilever, and the cantilever moves according to the tracking control signal current to generate the above information. A signal pickup of a rotary information recording medium reproducing apparatus characterized in that the cantilever is horizontally driven in a direction perpendicular to the tangential direction of the track, and the cantilever is horizontally driven in the tangential direction of the information track in accordance with the jitter compensation signal current. Device. 8. A signal pickup device for a rotating information recording medium reproducing device, as the cantilever according to claim 7, in which a portion through which a tracking control signal current flows and a portion through which a jitter compensation signal current flows are each formed into a bifurcated shape by a conductive plate. . 9 As the cantilever according to claim 7, the portion where the tracking control signal current flows and the portion where the jitter compensation signal current flows are formed into a shape in which elongated annular bands are connected in a T-shape by a conductive plate, respectively. A signal pickup device for a rotating information recording medium reproducing device, in which a conductor is insulated and fixed in a coil shape to the annular band surface of the rotary information recording medium. 10 As a cantilever according to claim 1, the portion through which the tracking control signal current flows and the portion through which the jitter compensation signal current flows are formed into a shape in which elongated annular bands are connected in a T-shape by an insulating plate, respectively. A signal pickup device for a rotating information recording medium reproducing device in which a conductor is fixed in a coil shape to one side of an annular band. 11 As the cantilever according to claim 7, the portion through which the tracking control signal current flows and the portion through which the jitter compensation signal current flows are formed into a shape in which elongated annular bands are connected in a T-shape by an insulating plate, respectively. A signal pickup device for a rotary information recording medium reproducing device, in which a conductor is fixed in a coil shape to one surface of an annular band, and a conductor is fixed in a showing shape to the other surface of each of the annular bands. 12 In the cantilever according to claim 7, the portion where the tracking control signal current flows and the portion where the jitter compensation signal current flows are integrally formed by winding a conductor into a coil shape in a plane and solidifying it with resin. A signal pickup device for a rotating information recording medium reproducing device. A scanner that scans the information track of the 13-rotation information recording medium and reproduces the information signal is fixed to one end, and it reciprocates at least once in the tangential direction of the information track to connect each conductor through which a tracking control signal current flows. and on the other end side to which the scanning element is not fixed, each is insulated from the conductor and through which a jitter compensation signal current flows back and forth at least once in a direction perpendicular to the tangential direction of the information track. A flat cantilever having a conductive material is placed in a cartridge case made of non-magnetic material and has a magnetic plate fixed to the bottom surface, and is placed above the magnetic plate at a predetermined distance, and is moved horizontally and vertically through an elastic material. A hole drilled in the top plate of the cartridge case is fixed to a rotating member rotatably provided to close an opening of a signal pickup head formed by a coaxial resonator. The cantilever is fitted to the DC magnetic field generating member, so that the cartridge case can be attached, and by this attachment, the cantilever is movable in the magnetic field between the DC magnetic field generating member and the magnetic plate fixed to the bottom surface of the cartridge case. When the opening of the signal pickup head is closed with the rotating member to which the DC magnetic field generating member and the cartridge case are attached, the scanning element comes into contact with the information track, and the scanning element and the signal pickup head are closed. A signal pickup device for a rotating information recording medium reproducing device configured to be electrically connected to a center conductor of a head.