JPS626612Y2 - - Google Patents

Description

[Detailed description of the invention] In recent years, there has been research and development into high-density recording and reproduction of various information signals using information recording medium disks (hereinafter sometimes abbreviated as disks). Practical research has become active, and many types of information signal recording and reproducing methods using disks have been announced. We are promoting development research and practical research on high-density recording and reproducing methods for information signals using disks in the form of disks, and we are developing methods that use changes in capacitance as a means of reading (detecting) information signals. Many proposals have been made regarding recording/reproducing methods using magnetic heads, optical reproducing methods, etc. (for example,
Publication No. 52-123205, Japanese Patent Application No. 52-13322
53-98814), Japanese Patent Application No. 52-95346 (Japanese Patent Application No. 1983-
No. 29617), Japanese Patent Application No. 35483 (Sho 54-)
128303).

By the way, when reproducing information signals from a non-grooved disc, a tracking control means is required to ensure that the information signal reproducing element (reproducing element) always accurately follows the recording trace on the disc. Needless to say, the reproducing element is driven and displaced in the width direction of the recorded trace by a driving device of a tracking control system. Furthermore, although disks are designed to be rotated accurately at a predetermined number of rotations when reproducing information signals, disks are inevitably subject to mechanical deformation due to various other causes during manufacturing. (distortion), even if the disc is rotated at a constant number of revolutions during playback, the mechanical deformation that exists in the disc will cause a gap between the recording trace and the playback element. This causes a change in the relative speed of the
will be included.

For this reason, conventionally, a time axis error correction signal obtained by comparing a reference signal in a disc playback signal with a standard signal is applied to a drive device of a time axis error correction control circuit of a playback element. The element is driven and displaced in the direction in which the recording trace extends, so that no time axis error occurs in the reproduced signal.

Therefore, when reproducing information signals from a non-grooved disc, two types of control, namely time axis error correction control and tracking control, are used to move the reproducing element in the direction in which the recording trace extends and the recording trace. It is necessary to drive and displace the reproducing element two-dimensionally in both the width direction and the width direction, and the applicant company also drives and displaces the reproducing element two-dimensionally when reproducing information signals from a grooveless disk. We have been conducting various research on drive devices for information signal reproducing elements that can perform the following functions, and we have already obtained many results (for example, Japanese Patent Application No. 52-35501 (Japanese Patent Application Laid-open No. 121610-1983)) ,
Japanese Patent Application No. 52-35502 (Japanese Unexamined Patent Application No. 53-121611), Japanese Patent Application No. 52-41151 (Japanese Unexamined Patent Application No. 53-125817), Japanese Patent Application No. 52-125817
−119999 (Unexamined Japanese Patent Publication No. 54-54015), Patent Application No. 11999-
No. 12230 (Japanese Unexamined Patent Publication No. 54-55401), Utility Application No. 52-90270
(Please refer to Utility Model Publication No. 18222, 1983).

A playback element that is configured to continue to receive information signals from the disk while in sliding contact with the disk is unavoidably worn due to sliding contact with the disk that is rotating at high speed. The elements, such as playback needles, magnetic heads, etc., need to be replaced from time to time, which is why information signal pick-up devices using playback elements that need to be replaced as described above. In this case, it is desired that the reproduction element part be easily attached to and detached from the drive unit part.

In view of this, the applicant company first applied for a patent application in 1972.
-12230 (Japanese Patent Application Laid-open No. 54-55401) proposes an information signal pick-up device in which a drive device and a reproducing element can be easily attached and detached. By implementing the device, we were able to achieve the expected results, but subsequent research revealed that there were some points that needed to be improved in the previously proposed device.

The present invention has been made for the purpose of solving the problems of the previously proposed information signal pickup devices described above and providing an information signal pickup device that is easy to manufacture and has excellent characteristics. The specific contents will be clarified below with reference to the attached drawings.

First, problems with the previously proposed information signal pickup device will be explained with reference mainly to perspective views 1 and 2 for explaining the outline of the previously proposed information signal pickup device.

In FIG. 1, the proximal tips (pivots) 16a ₁ and _16b 1 of the pick-up arm 16, to which the reproducing element 15 is attached, are fixed to the support plate 8 of the movable part A in the drive device. 2 is shown in a state in which it is in pressure contact with the pivot receivers 9a and 9b, and FIG. 2 shows the state in which the reproducing element is detached from the drive device.

In FIG. 1, the movable part A of the drive device has a plurality of coils 1, 2, etc. fixed to a support plate 3, and the support plate 3 is connected and fixed to a support member 10. When a driving current is supplied to the coil, the driving force generated between the coil and the magnetic field generated by the DC magnetic field generator B performs a linear movement in the Y direction and a rotational movement about the Z axis. The structure and operation of the drive device are disclosed in Japanese Patent Application No. 52-12230.
Details are given in the specification of the issue. ).

Both ends of the support member 10 are supported by supports 11a and 11b, and two pivot receivers 9a and 9b mounted on the support plate 3 are supported by support members 11a and 11b.
It protrudes outward through through holes 10a and 10b drilled in the.

The DC magnetic field generator B is composed of an outer magnetic path 5, a pole piece 6, permanent magnets 7, 8, etc. The tip of the pole piece 6 is divided into two parts 6a and 6b, and the above-mentioned movable part A The coil 1 is loosely fitted into the pole piece 6a so that one side thereof is present in the magnetic gap formed between the permanent magnet 7 and the pole piece 6a, and the coil 1 of the above-mentioned movable part A is 2 is a permanent magnet 8 and a pole piece 6b
The pole piece 6b is loosely fitted into the pole piece 6b so as to be present on one side of the magnetic gap formed between the pole piece 6b.

The permanent magnets 7 and 8 generate a magnetic field in the magnetic gap between each of them and the opposing pole pieces 6a and 6b, and direct current is generated in such a state that no magnetic field is generated between the pole pieces 6a and 6b. It is magnetized so that it can constitute a magnetic field generator.

In the drive device, the coil 1 of the movable part A,
When current is supplied to each of the coils 1 and 2 so that both coils 1 and 2 are driven in the same direction with the same driving force, the movable part A is connected to the reproducing element attached to the pick-up arm 16. is displaced in the direction of extension of the recording trace on the disk (Y direction), that is, in the direction of time axis error correction, and the coils 1 and 2 are driven in the same direction and oppositely with the same driving force. Each coil 1, 2
When a current is supplied to the movable part A, the movable part A rotates about the Z axis, and moves the reproducing element 15 attached to the pickup arm 16 in the width direction of the recorded trace on the disk (X direction). Therefore, if the magnitude and direction of the current supplied to the coils 1 and 2 of the movable part A are appropriate, the reproducing element can be driven two-dimensionally by the driving device. be.

When the cartridge part equipped with the pick-up arm 16 is attached to and detached from the drive device, the cartridge base body 21 is inserted into a guide groove provided in a transfer body (not shown in FIG. 1) on both sides 21a, 2.
While guiding 1b, it is moved in the direction of arrow 27 in FIG.

A bracket 33 is attached to the bottom surface of the cartridge base 21 by fixing means such as screws 34, for example.
A second permanent magnet 36 is fixed to this bracket 33 in correspondence with a first permanent magnet 36 fixed to a mounting body 35 bridging the proximal end side of each leg of the pick-up arm 16. A magnet 37 is provided, and a guide plate 38 made of a non-magnetic material is provided around the second permanent magnet 37, which is thicker than the second permanent magnet.

The guide plate 38 is sized such that a slight gap is formed between it and the permanent magnet 37.

The permanent magnets 36 and 37 described above are of the same shape and size, and the magnetic attraction between them enables the engagement and disengagement of the drive device and the pick-up arm.
An operation such as bringing it into contact with the disk surface of the reproducing element with a predetermined contact pressure is performed. Further, the guide plate 38 regulates the attracting state of the first and second permanent magnets when they are magnetically attracted, and provides a guiding function when the two are attracted.

Pickup arm 16 and cartridge base 2
1, the bracket 33, and the first and second permanent magnets, etc., when the cartridge section is separated from the drive device, the first permanent magnet fixed to the mounting body 35 of the pick-up arm 16 36 and the second permanent magnet 37 attached to the bracket 33 are magnetically attracted, and the pick-up arm 16 and the bracket 33 attached to the cartridge base 21 are mechanically integrated. It is. In this state, the reproducing element 15 attached to the tip of the pick-up arm 16 is held close to the cartridge base 21 side, so that the reproducing element 15 is protected when the cartridge section is separated from the drive device. ensure that it is carried out well.

When the cartridge section configured as shown in the second figure is coupled to a drive device, it is possible to pick up information signals as shown in the first figure. In this case, the process of connection between the two is as follows.

Cartridge base 21 in the cartridge part
Guide the cartridge base 21 along the arrow 27 while guiding the side edges 21a and 21b into the guide groove provided in the information signal pick-up transfer body.
When the pick-up arm 16 is pushed in the direction 27a in the direction of
Since the state of coupling of the permanent magnets 36 and 37 by magnetic attraction is regulated by the guide plate 38, both legs 16 of the pick-up arm 16
Pivots 16a ₁ , 16 at the tips of the proximal ends of a, 16b
_b1 always comes into contact with the valley supports of the pivot supports 9a, 9b fixed to the movable part A of the drive device.

Subsequently, as the cartridge portion is pushed in, the pivots 16a ₁ and 16b ₁ at the tips of the pick-up arm 16 press against the pivot receivers 9a and 9b, thereby moving the movable part A to which the pivot receivers 9a and 9b are attached. moves backward while bending the support member 10. Cartridge base 21
If you continue to push in the cartridge base 2
A second permanent magnet 37 fixed to a bracket 33 attached to the pick-up arm 16 and a first permanent magnet 36 fixed to a mounting body 35 provided to the pick-up arm 16 are coupled by magnetic attraction. is released, which causes pick-up arm 1
6 is attached to the bracket 33 by the magnetic attraction force through the gap between the second permanent magnet 37 attached to the bracket 33 and the first permanent magnet 36 provided on the side of the pick-up arm 16. While being pulled to the side, the pivots 16a ₁ and 1 are attached to the pivot receivers 9a and 9b attached to the drive device.
_6b1 remains pressed, the movable part A of the drive device moves away from the bracket 33 as the supporting member 10 returns to its resting position.

The operation of restoring the movable part A of the drive device to the rest position occurs at the moment when a gap is created between the first and second permanent magnets 36 and 37. Therefore, the cartridge base 21 of the cartridge part are pushed in, and the first and second permanent magnets 36, 3
7, the first and second permanent magnets 36 and 37 are Since the distance between them increases, it is not possible for them to be magnetically attracted again and become mechanically integrated.

If the cartridge base 21 is pushed in further, the bracket 33 stops against a stop 32 provided on the column 31 of the drive device.

In this way, when the cartridge base 21 is pushed in until it stops, the second permanent magnet 37 fixed to the bracket 33 and the first permanent magnet 3 provided on the pick-up arm 16 side
6 and 6 face each other with a predetermined gap in between, and the two are attracted to each other by magnetic attraction, so that the pick-up arm 16 has pivots 16a ₁ and 16b at the tip of its base end. ₁ is pressed against the pivot receivers 9a and 9b with the required contact pressure, and the playback element 15 attached to the tip of the pick-up arm 16 is pressed against the surface of the disk with the required contact pressure. Let it be done.

Next, a description will be given of the process when the cartridge section is separated and taken out from the state in which the drive device and the cartridge section are combined as shown in the first figure.

When picking up the information signal in the state shown in the first figure, the cartridge base 21 is moved in the direction of the arrow 2 in the figure.
7, the bracket 33 attached to the cartridge base 21 also moves together with the cartridge base 21, and the second permanent magnet 37 fixed to the bracket 33 is picked up accordingly. It approaches the first permanent magnet 36 provided on the arm 16 side.

As the gap between the first and second permanent magnets 36, 37 becomes smaller, the magnetic attraction between them increases rapidly, and the first and second permanent magnets 36, 37 suddenly become less magnetic. The pickup arm 16 side and the drive device are separated from each other. Both of these permanent magnets 3
6, 37, the second permanent magnet 37
The guide plate 38 provided around the first,
This effectively helps the second permanent magnets 36, 37 to be attracted and coupled in a predetermined coupling state.
When the cartridge section is subsequently pulled out, the cartridge is in the state shown in the second figure, in which the pick-up arm 16 and the cartridge base 21 are mechanically connected integrally by the first and second permanent magnets 36 and 37. It is taken out separately from the drive unit.

Now, in the case of picking up an information signal in which the cartridge section and the driving device described above are constructed so as to be able to move toward and away from each other by magnetic coupling means using the first and second permanent magnets 36 and 37, the pickup arm 1
A drive device has a contact pressure application function for bringing the playback element 15 attached to the pickup arm 6 into contact with the disk surface with a predetermined contact pressure, and the pivots 16a ₁ and 16b ₁ at the tips of the base end of the pick-up arm 16. Pivot receiver 9 attached to movable part A in
a, 9b and a magnetic gap between the first and second permanent magnets 36, 37 provided in the cartridge portion. It is given by the force of attraction.

In addition, since the components for providing both of the functions described above are grouped together on the cartridge side,
Each cartridge part can be made to have the required performance, and when the cartridge part is separated from the drive device, the first permanent magnet 36 provided on the side of the pick-up arm 16 is attached to the cartridge base 21. Bracket 33
The adsorption state with the second permanent magnet 37 is regulated by the opening of the guide plate 38 that exists around the second permanent magnet 37 attached to the second permanent magnet 37, so that the permanent magnet 37 is magnetically adsorbed with the second permanent magnet 37. Therefore, even when the pick-up arm 16 is separated from the drive device, it does not wobble and can always maintain a predetermined positional relationship and correct posture with respect to the cartridge base 21. Therefore, when the cartridge portion is coupled to the drive device, the pivot at the tip of the proximal end of the pick-up arm 16 can be brought into pressure contact with the pivot receivers 9a and 9b provided on the drive device side. .

Furthermore, the first and second permanent magnets 3 in a state where the cartridge part and the drive device are separated
When the two are mechanically connected by magnetic attraction of the cartridges 6 and 37, the reproducing element 15 attached to the tip of the pick-up arm 16 is attached to the cartridge base 2.
The pick-up arm 16 is held so that it is pulled toward the first side, and when the cartridge section and the drive device are connected, the first
The second permanent magnets 36 and 37 are attracted and connected to each other by magnetic attraction force with a magnetic gap interposed between them. The attached reproducing element 15 is attached to a second permanent magnet 3 fixed to a bracket 33 in the cartridge part.
Due to the difference in the mounting position between the drive unit 7 and the pivot receivers 9a and 9b on the driving device side, the playback element 15 is brought into contact with the disk surface with a predetermined contact pressure while being separated from the cartridge base 21. Therefore, when the cartridge section is separated from the drive device side, the playback element 15, lead wire 29, etc. are completely protected, and when the cartridge section and the drive device are combined, the disk Even if there is surface wobbling or vibration, the reproducing element 15 can accurately trace the recorded trace without leaving the disk surface.

By the way, in the above-mentioned information signal pick-up device shown in the first diagram, the pick-up arm 1
Each pivot 16 on each leg 16a, 16b of 6
Pivot receivers 9a, 9b for receiving a ₁ , 16b ₁
As a result, when the cartridge portion is mounted on the drive device, each of the two pivots 16a ₁ and 16b ₁ does not necessarily fit into the two pivot supports 9a. ,9
The pivots 16a ₁ and 16b ₁ in each leg are brought into contact with the respective pivot receivers as the state of engagement between the cartridge portion and the drive device progresses. 9a and 9b, but the pivot receiver 9 in this already proposed device
a, 9b, each leg 1 of the pick-up arm 16
6a, 16b pivots 16a ₁ , 16b ₁ at the center position (X direction) of each pivot receiver 9a, 9b.
Therefore, in order to connect the cartridge part to the drive device, the cartridge base 21 in the cartridge part is connected to the transport body 2.
Guide base 2 in 4 (see Figures 6 to 8)
If the installation angle of the cartridge base 21 changes due to the presence of play between the guide groove 25 in the guide base 23 and the cartridge base 21 when the cartridge base 21 is inserted into the guide groove 25 of the pick-up arm 16. It happens that each of the pivots 16a ₁ and 16b ₁ is supported by each of the pivot supports 9a and 9b at a position that is shifted in the lateral direction (X direction) from the center position of the pivot supports 9a and 9b.

In order to eliminate this problem, the two pivot supports 9a and 9b should both have conical concave surfaces, but if such a solution is adopted, the pick up arm 16 The distance between the two pivots 16a ₁ and 16b ₁ is required to be the same as the distance between the two pivot supports 9a and 9b, and for this reason, the manufacturing accuracy of the pick up arm 16 and the distance between the pivot supports 9a and 9b are required. Since it is required to improve the mounting accuracy of 9b, a problem arises in mass production of the device.

The present invention provides a support plate 3 for a movable part in a drive device.
By making one of the two pivot supports 9a and 9b to be fixed to the pivot support having a trough-like receiving surface and the other having a concave concave receiving surface, The above-mentioned problems have been solved satisfactorily, and the specific contents thereof will be explained below by taking as an example the embodiments shown in the accompanying drawings starting from FIG.

FIG. 3 is a perspective view of one embodiment of the information signal pickup device of the present invention;
The figure shows a state where the cartridge part and the drive device are combined, FIG. 4 is a perspective view of the cartridge part and the drive device separated, and FIG. 5 is a partially exploded view of the drive device. 6 to 8 are a perspective view (FIG. 6) and a vertical side view (FIG. 7) illustrating how the information signal pickup device is used.
Figure 8). In FIGS. 3 and 4, a part of the drive device is broken down to show the internal structure. In addition, in each figure of FIG. 3 to FIG. 8, each component corresponding to each component in the already proposed device shown in FIG. sign is used.

In the information signal pickup device of the present invention shown in FIG. 3, the drive unit shown in the exploded perspective view of FIG. 5 is used. That is, in FIG. 5, the support plate 3 and the support member 10 of the movable part A are connected by a rigid connecting body 14, and when the movable part A moves in a linear motion, the support member 10 has an arcuate shape. When the movable part A rotates, the support member 10 deforms into an S-shape, and the tip of the proximal end of the support member 10 deforms into an S-shape, and the tip of the proximal end of the support member 10 is attached to the two pivot receivers 9a and 9b fixed to the support plate 3. Reproduction element 15 fixed to the tip of the pick-up arm to which pivots 16a ₁ and 16b ₁ are pressed
is displaced in a predetermined direction.

Two pivot receivers 9 fixed to the support plate 3
Among a and 9b, one 9a is a pivot holder with a valley holder, and the other 9b is a pivot holder having a conical recess.
As a result, the manner in which the pivots 16a 1 , 16b ₁ at the tips of the proximal ends of the pick-up arm ₁₆ and the pivot receivers 9a, 9b can be quickly and accurately brought into contact with each other during the mounting operation of the cartridge portion to the drive device. be.

Reference numeral 17 denotes a cover, and 18 a front plate. The front plate 18 has through holes 18a and 18b through which pivots 16a ₁ and 16b ₁ at the tips of the base end of the pick-up arm 16 can pass. Front plate 1
8 may be made of non-magnetic material, but if it is made of ferromagnetic material, a magnetic shielding effect will be added, and iron powder etc. from the outside will not enter the drive device where a strong DC magnetic field exists. It can effectively prevent entry. In addition, the through hole 1 bored in the front plate 18
8a and 18b are such that even if the pick-up arm 16 shakes significantly when the cartridge section and the driving device are rapidly mounted, the outer peripheral portions of the pivots 16a ₁ and 16b ₁ will abut against the edges of these holes. This effectively serves to ensure that the runout is well limited.

A permanent magnet 19 is fixed to the front plate 18, and when the cartridge section is attached to the drive device, the permanent magnet 19 is attached to the bracket 3 attached to the cartridge base 21 of the cartridge section.
3 facing the drive device (or a permanent magnet for coupling newly fixed on the surface of the bracket 33 facing the drive device) by magnetic attraction. is being done.

Therefore, by inserting both side edges of the cartridge base 21 of the cartridge portion along the guide grooves 25 provided in the guide base 23 of the transfer body 24 (see FIGS. 7 and 8), the cartridge portion is connected to the drive device. When the cartridge is attached to the cartridge, the bracket 33 on the cartridge base 21 of the cartridge unit and the permanent magnet 19 attached to the front plate 18 of the drive unit are magnetically attracted, so that the cartridge unit and the drive unit are firmly connected. be combined.
Therefore, the guide groove 2 in the guide base 23
5 and the cartridge base 21, when the cartridge base 21 is inserted into the guide base 23, the cartridge base 21
Even if the cartridge is inserted in an incorrect position, the bracket 33 of the cartridge base 21 and the permanent magnet 19 of the front plate 18 of the drive device are magnetically attracted to each other, so that the cartridge part and the drive device are always in the correct position. They are connected in a bonded state.

That is, in order to attach the cartridge part to the drive device, the cartridge base 21 of the cartridge part is
When inserted along the guide groove 25 of the guide base 23, the pivots 16a 1 and 16b ₁ of the legs 16a and _16b of the pick-up arm 16
The pivot receiver 9 passes through the through holes 18a and 18b of the front plate 18 of the drive device and is fixed to the support plate 3.
It abuts on the inclined surfaces of a and 9b.

When the cartridge base 21 is further inserted from this state, the pivots 16a ₁ and 16b ₁ of the pick-up arm 16 move to the center of the pivot receivers 9a and 9b, and move into the movable part A via the pivot receivers 9a and 9b. In order to push , the support member 10 deforms into an arcuate shape and moves the movable part A backward. When the cartridge base 21 is further inserted, the second permanent magnet 37 fixed to the bracket 33 attached to the cartridge base 21 and the first permanent magnet 36 fixed to the mounting body 35 on the side of the pick-up arm 16 are removed. The magnetic coupling between the pick-up arm 16 and the bracket 33 is thereby released.
It is driven while being attracted to the bracket 33 side by the magnetic attraction force through the gap between the second permanent magnet 37 attached to the pickup side and the first permanent magnet 36 installed on the pickup side. With the pivots 16a ₁ and 16b ₁ pressed against the pivot receivers 9a and 9b attached to the device, the movable part A of the drive device returns to the stationary position as the support member 10 is restored. Bracket 3
Move in the direction away from 3.

At the same time, the bracket 33 attached to the cartridge base 21 is magnetically attracted by the coupling permanent magnet 19 fixed to the front plate 18 of the drive device, so that it suddenly moves toward the drive device. The bracket 33 is moved to the permanent magnet 19.
magnetically attracted to. This magnetic coupling operation between the bracket 33 and the permanent magnet 19 is performed impulsively within a short period of time immediately after the first and second permanent magnets 36 and 37 are separated. While the distance between the second permanent magnets 36 and 37 is rapidly adjusted to the regular distance, the impactful coupling operation between the bracket 33 and the permanent magnet 19 causes the pivots 16a ₁ and 16b ₁ to Even if the pivot is caught on the inclined surface of the pivot receivers 9a, 9b, this serves to force the pivot to rapidly move to the center of the pivot receivers 9a, 9b.

Therefore, even if pivot receivers 9a and 9b whose inclined surfaces are not mirror-polished are used, the pivots 16a ₁ and 16b ₁ will not hold the pick up arm 16 due to the above-mentioned impactful coupling operation. The pivot 16b ₁ of one leg 16b of the pick-up arm 16 is reliably guided to the center of the pivot receiver 9b, which has a conical concave surface, and the pivot 16a ₁ of the other leg 16a of the pick-up arm 16 is also guided to the center of the pivot receiver 9b, which has a conical concave surface. With reference to the position of the pivot _16b1 of the pivot 16b1, the pivot receiver 9a is reliably guided to the center of the valley of the pivot receiver 9a, which has a receiving surface of the valley receiver.

As described above, in the device of the present invention, the pivot 16 of one leg 16b of the pick-up arm 16
Since only b ₁ is received by the pivot holder 9b whose receiving surface is a conical concave surface, and the pivot 16a ₁ of the other leg 16a is received by the pivot holder 9a whose receiving surface is a valley holder, the pick-up is easy. Even if the manufacturing accuracy of the arm 16 and the installation accuracy of the two pivot supports are not high, each of the pivots 16a ₁ and 16b ₁ of the two legs of the pick-up arm 16 is always set to 2.
It is supported at the center of two pivot receivers 9a and 9b.

The pivot supports 9a and 9b are made of, for example, duralumin, Y alloy, or anodized aluminum, and the wall surfaces of the support surfaces form a 90 degree angle.
If stainless steel or heat-treated iron is used for a ₁ and 16b ₁ , the pivot holder 9a,
Even if you do not apply a mirror finish to the wall surface of 9b,
Pivots 16a ₁ and 16b ₁ are pivot receivers 9a and 9b.
It has been confirmed that you will be reliably guided to the center of the city.

In addition, in FIGS. 6 to 10, reference numeral 22 indicates a disk that is rotated at a predetermined rotational speed in the direction of arrow R.

As is clear from the detailed explanation above, in the information signal pick-up device of the present invention, the two legs 16a of the pick-up arm 16,
Corresponding to each pivot 16a ₁ and 16b ₁ of 16b,
As for the two pivot receivers 9a and 9b to be provided on the support plate 3 of the movable part A of the drive device, the receiving surface of one of them is assumed to be a valley receiver,
In addition, by making the receiving surface of the other part a conical concave surface, all of the problems in the previously proposed devices are successfully solved, and the device of the present invention can be easily With this configuration, it is possible to easily and inexpensively provide an information signal pickup device whose performance is significantly improved compared to previously proposed devices.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the previously proposed information signal pickup device, FIG. 2 is a perspective view of the same cartridge section, FIG. 3 is a perspective view of an embodiment of the information signal of the present invention, and FIG. 4 is the same as above. FIG. 5 is an exploded perspective view of the drive device, and FIGS. 6 to 8 are perspective views in use (FIG. 6) and partially longitudinal side views (FIGS. 7 and 8). . A...Movable part, B...Direct current magnetic field generator,
1, 2...Coil, 3...Support plate, 9a, 9b...
...Pivot receiver, 10...Support member, 11a, 11
b... Support body, 14... Connecting body, 16... Pick up arm, 16a ₁ , 16b ₁ ... Pivot, 1
8... Front plate, 19... Permanent magnet, 23... Guide base, 24... Transfer body, 25... Guide groove, 2
1... Cartridge base, 33... Bracket,
36...first permanent magnet, 37...second permanent magnet.

Claims (1)

[Scope of utility model registration request] The information recording medium disk is slid against the surface of the information recording medium disk with a predetermined contact pressure, and traces a spiral or concentric recording trace on the information recording medium disk to read the information signal in the recorded trace. The two pivots formed at the other end of the pick-up arm to which the reproduction element is fixed at one end,
An information signal which can be removably pressed onto two pivot supports fixed to a movable part of a drive device provided to drive and displace the above-mentioned reproducing element in a predetermined direction on an information recording medium disc. In the pick-up device, one of the two pivot supports fixed to the movable part of the drive device has a valley support surface, and the other has a concave concave support surface. An information signal pick-up device having a pivot receiver.