JPH043029B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) Signal recording performed on a rotating recording medium by applying various recording and reproducing methods, and signal scanning used for reproducing signals from the rotating recording medium. Concerning child assemblies.

(Prior Art) A recording and reproducing apparatus configured to record information signals on a disc-shaped or cylindrical rotating recording medium by applying various recording and reproducing methods, and to reproduce the recorded information signals, It is well known that it has been widely used for recording and reproducing various information signals.

In recent years, in order to meet the demand for high-density recording and reproducing, recording and reproducing elements that are driven and displaced by a closed-loop tracking control system are used to record traces that are formed at minute intervals on recording media. It has also begun to be possible to trace such signal scanners.

FIGS. 10 and 11 show a signal scanner assembly provided with a signal scanner for recording and reproducing signals by slidingly contacting the recording medium surface of a rotating recording medium, and a signal scanner assembly provided with a signal scanner for recording and reproducing signals; FIG. 3 is a perspective view of a conventional device coupled to an actuator configured to drive and displace a signal scanner in two directions: a direction and a direction perpendicular to the direction in which a recording trace extends; In FIGS. 10 and 11, A is the general symbol of the movable part of the actuator, and B is the general symbol of the DC magnetic field generating part of the actuator.

In the conventional device shown in FIGS. 10 and 11, the movable part A is made of an elastic material (for example, rubber) at the central vertical portion of the support plate 3 to which a plurality of coils 1, 2, . . . are fixed. Connecting member 14 consisting of
A fixed fulcrum member 15 (a plurality of fixed fulcrum members 15 (a plurality of fixed fulcrum members are provided at intervals in the vertical direction ) is used to set the pivot point. The above-mentioned support member 12 has supports 1 such as rubber at both ends thereof.
3a and 13b, the support member 12 can easily bend in the front-back direction, but it does not deform in other directions. Therefore, the displacement in the front-back direction in the movable part A is , is easily performed by the support member 12, and the rotational movement of the movable part A is easily performed with the straight line position connecting the apexes of the rotational fulcrum member 15 serving as the rotational axis, and movement in other directions is easily performed. is suppressed. In the figure, 12a and 12b are through holes in the support member.

The thickness of the above-mentioned connecting member 14 in the front-rear direction is slightly smaller than the length of the rotation fulcrum member 15 in the front-back direction. After the support plate 3 and support member 1 are connected and fixed by 14,
If the rotation fulcrum member 15 is inserted into the gap between the
The connecting member 14 is in an extended state, and its contractile force causes the support plate 3 to be properly pressed against the apex portion of the rotation fulcrum member 15.

In the conventional device shown in FIG. 10, rubber dampers 5a, 5b are fixed to the support plate 3, and each leg 6a, 6b of a two-pronged cantilever 6 is attached to the rubber dampers 5a, 5b. The base of the signal scanner 7 is fitted onto the cantilever 6, and when it comes into contact with the surface of the rotating recording medium, the signal scanner 7 is fitted with the rubber dampers 5a, 5 described above.
The elasticity in the vertical direction at b causes contact with the surface of the rotating recording medium with a predetermined contact pressure.

In addition, in the conventional device shown in FIG.
3 is attached, and a permanent magnet is fixed near the center of a holder 24 that is provided to bridge the base ends of the legs 6a and 6b of the two-pronged cantilever 6. When the tips 6a1, 6b1 of the legs 6a, 6b of the cantilever 6 are in pressure contact with the pivots 20a, 20b, the two permanent magnets 23, 24 are attracted to each other through the magnetic gap, and the above-mentioned Pivot 2 the tips 6a1 and 6b1 of each leg 6a and 6b of the cantilever 6.
0a and 20b.

DC magnetic field generation part B in actuator
is the outer magnetic path 8, the pole piece 9, and the permanent magnet 10,
11, etc., and the tip of the pole piece 9 is divided into two parts 9a and 9b, and the coil 1 of the movable part A described above is connected to the magnetic gap formed between the permanent magnet 10 and the pole piece 9a. The coil 2 of the movable part A is loosely fitted into the pole piece 9a so that one side of the coil 2 is present in the magnetic gap formed between the permanent magnet 11 and the pole piece 9b. It is loosely fitted into the pole piece 9b so that the side surface is present.

The permanent magnets 10, 11 generate a magnetic field in the magnetic gap between each one and the opposing pole pieces 9a, 9b, and also
B is magnetized so as to constitute a DC magnetic field generating section B that does not generate a magnetic field.

The coils 1 and 2 of the movable part A in the actuator configured as described above are coiled by the electromagnetic force generated between the current supplied to them and the magnetic field of the magnetic gap in the DC magnetic field generating part B. Although the coils 1 and 2 are driven and displaced in the axial direction (X direction), the respective coils 1 and 2 are driven in the same direction with the same driving force.
When current is supplied to 2, the movable part A
The signal scanner 7 attached to the cantilever 6 is displaced in the direction of extension of the recording trace on the rotating recording medium (X direction), that is, in the direction of time axis error correction, and the coils 1 and 2 are moved in the same direction. When current is supplied to each of the coils 1 and 2 so that they are driven in opposite directions with the same drive, the movable part A rotates about the Z axis and is attached to the cantilever 6. The signal scanner 7 is displaced in a direction (Y direction) perpendicular to the direction of extension of the recording trace on the rotating recording medium, that is, in a tracking error correction direction.

(Problems to be Solved by the Invention) By the way, in the conventional device shown in FIG.
Since the cantilever 7 and the rubber damper 5 are connected to the movable part A of the actuator by
Due to the resonance of the mechanical resonance system constituted by a and 5b, screws and vibrations occur in the signal scanner, which may impair the tracking control operation or increase the loop gain of the tracking control system. If a rubber damper with extremely high stiffness is used to eliminate the above-mentioned drawback, the contact pressure of the signal scanner against the surface of the rotating recording medium will increase, causing the recording A problem arises in that the medium surface is damaged.

In addition, the rubber damper used as a component has poor temperature characteristics, environmental resistance, chemical resistance, etc., and also lacks stability due to large changes over time.Furthermore, it has poor positioning accuracy. This method also has drawbacks such as not being able to maintain the contact accuracy of the signal scanner, and furthermore, it being difficult to maintain the positioning accuracy when replacing the cartridge.

Since the conventional device shown in FIG. 11 does not use a rubber damper, the problems described in the conventional device shown in FIG. 10 do not occur.However, in the conventional device shown in FIG. At the base end of the cantilever 6, a cantilever with a complicated configuration is used, which is expensive to manufacture, as it requires accurate alignment of conical pivots and press-fitting. It was desired to provide a cantilever that was simple in construction and inexpensive. Furthermore, the pivot bearings described above require complex machining, making them expensive, which also poses a problem in terms of reducing the cost of the device.

(Means for Solving the Problems) The present invention provides a first member including a signal scanner that is to be brought into contact with a recording medium surface of a rotating recording medium with a predetermined contact pressure, and the first member described above. A signal scanner assembly comprising a second member to be removably coupled, the second member having two pivots, and the first member having two pivots as described above. Pivot receiving holes are provided corresponding to each of the two pivots provided in the second member, and a biasing force for mechanically coupling the first member and the second member is provided. The present invention provides a signal scanner assembly that uses the magnetic force generated between the magnetic field generating members provided in the first member and the second member, respectively.

(Embodiments) Hereinafter, specific details of the signal scanner assembly of the present invention will be explained in detail with reference to the accompanying drawings. In the description of the embodiments below, a case where a magnetic head is used as a signal scanner is given as an example, but when implementing the signal scanner assembly of the present invention, the signal scanner used Of course, a signal converter other than a magnetic head may be used as the magnetic head. FIG. 1 is a perspective view of one embodiment of the signal scanner assembly of the present invention, in which C is the first member in the signal scanner assembly, and E is the signal scanner assembly. The first member C and the second member E, which are the second members of the assembly, are each configured separately, and the first member C is different from the second member E. It is made to be removable.

The vibration scanning element assembly shown in FIG. 1 has a thin metal plate (for example, a 0.1 mm thick thin plate of aluminum, beryllium, titanium, phosphor bronze, etc.) as its first member C, as shown in FIG. This is an example in which a die is punched into the shape shown in the developed view and then bent. b in Fig. 4 is a rear view of the product after the bending process has been applied to the one shown in Fig. FIG. 4 is a side sectional view taken along the line U-U shown in FIG.

In FIG. 1, H is a magnetic head fixed to the tip of the first member C in the signal scanner assembly, and this magnetic head H is attached to the mounting piece 30 of the first member C. The first member C can be fixed to the first member C in a predetermined attachment manner.

In the first member C, the rear wall 31 thereof has a through hole 32 for receiving a pivot for engaging the conical pivots 34 and 35 provided in the second member E of the signal scanner assembly. 33 are drilled.

Among the through holes 32 and 33, one 32
has a circular planar cross-sectional shape, and the other one 33 has an elongated shape with a large length in the direction of the straight line connecting the two pivots 34 and 35, which have a planar cross-sectional shape. In Figure 1, 4
Reference numerals 8 and 48 denote vibration absorbing agent coating layers, and these vibration absorbing agent coating layers 48 and 48 can be constructed using, for example, a known adhesive that becomes rubber-like after hardening.

36 is a permanent magnet, and this permanent magnet 36 is fixed to a mounting plate 37 provided near the rear end of the first member C. In addition, the second member E
A permanent magnet 38 is fixed to the.

The second member E in the signal scanner assembly is fixed to the movable part A of the actuator provided in the transfer part of the signal scanner in the recording/reproducing apparatus, as illustrated in FIG. Or,
Alternatively, the second member E and the first member C may be directly fixed to the signal transfer section of the recording/reproducing device.
This is achieved by inserting the two conical pivots 34 and 35 in the second member E into the pivot receiving holes 32 and 33 formed in the first member C. It is done.

As mentioned above, when the two conical pivots 34 and 35 of the second member E are inserted into the pivot receiving through holes 32 and 33 drilled in the first member C, the conical pivot 34 , 35 are engaged with the edges of the pivot receiving holes 32, 33 formed in the first member C, the first member C and the second member E are connected. are concatenated.

Then, the permanent magnet 36 provided on the first member C and the permanent magnet 38 provided on the second member E magnetically attract each other through the air gap, so that the first member The member C and the second member E are integrally mechanically connected to each other so as to be able to rotate in the vertical direction at the engagement portions between the pivots 34 and 35 and the pivot receiving through holes 32 and 33. It is. In the state where the first member C and the second member E in the signal scanner assembly are mechanically coupled as described above, the pivots 34, 3
5 and the through holes 32 and 33 for pivot receiving, the two permanent magnets are arranged so that the tip of the first member C is rotated in the direction of arrow 40 in FIG. By determining the direction of the magnetic attraction force acting between the two permanent magnets 36 and 38 and appropriately setting the magnitude of the magnetic attraction force acting between the two permanent magnets 36 and 38, the magnetic head H is rotated toward the recording medium. The contact surface can be brought into contact with a predetermined contact pressure.

Further, by exciting the electromagnet indicated by the reference numeral 39 in FIG. 1, the electromagnet 3 described above
9 can attract the permanent magnet 36 in the first member C to rotate the first member C upward.

The first member C in a state where the first member C and the second member E described above are integrated.
forwards against the magnetic attraction force acting between the permanent magnet 36 provided on the first member C and the permanent magnet 38 provided on the second member E. By pulling, the first member C can be easily moved to the second member C.
can be separated from member E of. Therefore, the first member C, which is considered a consumable item, can be replaced extremely easily, and moreover, the first member C, which is considered a consumable item, can be easily replaced with the second member E. The configuration for the second member E
Since the first member C is only provided with a circular hole and an elongated hole that can be engaged with the vicinity of the tip of the conical pivot provided in the first member C, it is possible to manufacture the first member C at a low cost. It can be done.

FIG. 8 shows how the second member E in the signal scanner assembly shown in FIG. It is a diagram showing a state in which the first member C is connected to the first member C that has been firmly fixed. Further, FIG. 9 is a diagram illustrating a case where the signal scanner assembly of the present invention is used in a recording/reproducing apparatus in which a cylindrical recording medium is used as a rotating recording medium. This cylindrical recording medium D is driven and rotated at a predetermined number of rotations by a drive motor Md. 43 in Fig. 9 is a motor housing, 44
is the support part. The signal scanner assembly is connected to the transport body 4
The second member E thereof is fixed to an actuator 46 attached to the actuator 5, and the actuator 46 is fixed to the transfer body 45. The transfer body 45 is engaged with the feed screw 42 and the guide rod 41, and the rotational force of the transfer motor Mf is applied to the reducer 4.
By rotating the feed screw 42 at a speed reduced by 7, the signal scanner is moved in the direction of the generatrix of the cylindrical recording medium.

It goes without saying that the signal scanner assembly of the present invention can be used satisfactorily even when the rotating recording medium is planar.

Next, in the embodiment shown in FIG. 2, the first member C of the signal scanner assembly is fixed to the coupling plate 51 by fixing the base of a pipe 50 of a suitable material (for example, an aluminum pipe) to the coupling plate 51; Further, a permanent magnet 36 is fixed to the back side of the above-mentioned coupling plate 51, and a magnetic head H is attached to the tip of the above-mentioned pipe 50.
It is constructed by fixing the In FIG. 2, the second member E of the signal scanner assembly is constructed by mounting two pivots 35, 36 and a permanent magnet 38 on a base plate 52.

Further, in the embodiment shown in FIG. 5, the first member C in the signal scanner assembly has through holes 32 and 33 for receiving pivots formed on the upper surface of its base, and
A structure having a permanent magnet 36 fixed thereto is used, and as the second member E in the signal scanner assembly, a through hole for a pivot receiving hole bored at the base of the upper surface of the first member C described above is used. 32, 33
The pivots 34, 35 to be inserted into the substrate 53
The permanent magnet 38 is fixed to the substrate 53.

FIG. 6 shows how the biasing force for mechanically coupling the first member C and the second member E in the signal scanner assembly is applied to the permanent magnet 36 fixed to the first member C and the permanent magnet 36 fixed to the first member C. This is an embodiment in which the repulsion is obtained by magnetic repulsion between the permanent magnet 38 fixed to the member E of No. 2. In the embodiment shown in this FIG. 6, the first member C in the signal scanner assembly is the first member C shown in FIG.
It is assumed that a member having the same structure as the first member C is used (however, a part of the description of the first member C is omitted in FIG. 6).

In the embodiment shown in FIG. 6, the second member E does not have conical pivots 34 and 35 implanted directly in the substrate 54, but is provided at a position spaced upward from the surface of the substrate 54. Pivot 3
The pivots 34, 35 are fixed to the mounting plates 55, 56 of No. 4, 35 in such a way that the tips of the pivots 34, 35 face the substrate 54, and the surface of the substrate 54 of the second member E mentioned above and the pivot 34, 35
The coupling plate 5 in the first member C from between the tip of the
1, and the through-holes 32, 33 for pivot receiving, which are bored in the coupling plate 51 of the first member C, are inserted into the tips of the pivots 34, 35 provided in the second member E. I try to do that.

Then, as described above, the first member C and the second member
When the first member C and the second member E are mechanically connected to each other by the pivots 34 and 35 and the pivot receiving holes 32 and 33, the first member C and the second member E are connected to each other by the first member C and the second member E. A permanent magnet 36 provided in
Due to the repulsive force of the permanent magnet 38 provided in the second member E, the through holes 32 and 33 for receiving the pivot in the first member C and the pivots 34 and 35 in the second member E are connected. Forced in a direction that strengthens the bond. In the case of the embodiment shown in the sixth figure, even if large external vibrations are applied to the signal scanner assembly, the coupling between the first member C and the second member E will not separate. do not have.

Next, in the embodiment shown in FIG. 7, an electromagnet 57 is provided in place of the permanent magnet as the magnet provided on the substrate 52 of the second member E in the signal scanner assembly. When the second member E configured as in the embodiment shown in FIG. 7 is used, by changing the magnitude of the current supplied to the electromagnet 57, the The magnitude of the contact pressure of the magnetic head H can be adjusted.

(Effects) As is clear from the detailed explanation above, the signal scanning assembly of the present invention has a first signal scanning element that is provided with a signal scanning element that is to be brought into contact with the recording medium surface of a rotating recording medium with a predetermined contact pressure. and a second member to which the first member is removably coupled, the second member is provided with two pivots, and the second member is provided with two pivots; The first member is provided with holes for receiving pivots corresponding to the two pivots provided in the second member, and
The magnetic force generated between the magnetic field generating members provided in the first member and the second member, respectively, is used as the urging force for mechanically coupling the first member and the second member. Since the signal scanner assembly of the present invention is made of
The component for mechanical engagement with member E of
There is only a through hole for engaging near the tip of the conical pivot provided in the second member E, and in the signal scanner assembly of the present invention, the expensive pivot is not a consumable part. Furthermore, since a precision-machined pivot receiver is not used as the pivot receiver, the signal scanner assembly can be provided at low cost. Furthermore, one of the two pivot receiving holes provided in the first member corresponding to the two pivots provided in the second member has a circular planar cross-sectional shape. In addition, by making the other member have an elongated planar cross-sectional shape with a large length in the direction of the straight line connecting the two pivots, the first member C can be transformed into the second member E.
Easy to operate when attaching and detaching. Furthermore, the first member to which the signal scanner is attached is constructed by bending a thin metal plate, and
If the planar shape is triangular, a signal scanner is attached to the apex of the triangle, and two holes for receiving two pivots are provided at the base of the triangle, it is possible to reduce the cost. In addition, it is possible to easily obtain a signal scanner assembly having a large mechanical strength.Furthermore, one of the magnetic field generating members provided in the first member and the second member, respectively, can be used as an electromagnet. By doing,
According to the signal scanner assembly of the present invention, the contact pressure of the magnetic head against the surface of the rotating recording medium can be freely adjusted, and the above-mentioned drawbacks of the conventional ones can be overcome, and high precision can be achieved at extremely low cost. Thus, it is possible to provide a signal scanner assembly of.

[Brief explanation of drawings]

1, 2, and 5 are perspective views of different embodiments of the signal scanner assembly of the present invention;
The figure is a developed view when the first member of the signal scanner assembly shown in FIG. 1 is made of a thin metal plate, and a in FIG. The back view of the processed product, b in Figure 4 is a rear view seen from the arrow W-W direction shown in a in Figure 4, and c in Figure 4 is shown in a in Figure 4. 6 and 7 are perspective views of different configurations of the second member in the signal scanner assembly of the present invention, and FIG. 8 is a side sectional view taken along line U-U of the present invention. FIG. 9 is a perspective view of a portion of an example recording/reproducing apparatus, and FIGS. 10 and 11 are perspective views of a conventional example. C...first member, E...second member, H...
Magnetic head, 32, 33... Pivot receiving hole, 34, 35... Pivot, 36, 38... Permanent magnet, 50... Pipe, 51... Connection plate, 5
2, 53, 54... Board, 55, 56... Pivot mounting plate, 39, 57... Electromagnet.

Claims (1)

[Claims] 1. A first member provided with a signal scanner that is to be brought into contact with a recording medium surface of a rotating recording medium with a predetermined contact pressure, and the above-mentioned first member should be removably coupled. In the signal scanner assembly, the second member is provided with two pivots, and the first member is provided with two pivots, and the first member is provided with two pivots. Pivot receiving holes are provided corresponding to each of the two pivots, and as an urging force for mechanically coupling the first member and the second member,
A signal scanner assembly that uses magnetic force generated between magnetic field generating members provided in the first member and the second member, respectively. 2. Two pivot receiving holes provided in the first member corresponding to the two pivots provided in the second member, one of which has a circular planar cross-sectional shape; The signal scanner assembly according to claim 1, wherein the other one has a planar cross-sectional shape that is elongated and has a large length in the direction of the straight line connecting the two pivots. 3. The signal scanner assembly according to claim 1, wherein the first member to which the signal scanner is attached is constructed by bending a thin metal plate. 4 The planar shape is made into a triangle by bending a thin metal plate, and a signal scanner is attached to the apex of the triangle, and two pivot receivers are attached to the base of the apex. 2. The signal scanner assembly according to claim 1, wherein the first member is provided with a hole. 5. The signal scanner assembly according to claim 1, wherein one of the magnetic field generating members provided in the first member and the second member is an electromagnet.