JPH06243603A - Head transferring mechanism of recording and reproducing device and stepping motor for head transfer as well as head transferring device and carriage position detector - Google Patents

Abstract

PURPOSE:To provide the head transferring mechanism of a recording and reproducing device which can make adjustment to rotationally move a lower head after device assembly in the circumferential direction of a disk and within the disk plane in addition to the radial direction of the disk in the positioning adjustment of the lower head and can omit the adjustment of an optical sensor indicating the reference position of the carriage. CONSTITUTION:A driving motor 11 is mounted and fixed to a frame 3 without the positioning adjustment. A lower arm 21 is so supported and adjusted to the carriage 2 that this arm can make translational motion in the radial and circumferential directions of the disk 1 and can be adjusted to make rotational movement within the disk plane. The lower am 21 is so constituted that the arm can be fixed to the carriage 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording or reproducing information using a disc.
In particular, the present invention relates to a head transfer mechanism, a stepping motor for head transfer, a head transfer device, and a carriage position detection device.

[0002]

[Prior art]

Conventional example 1. 17 to 19 show, for example, the actual Kaihei 1-107.
FIG. 17 is a perspective view of the head moving mechanism of the conventional magnetic recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 062, and FIG.
7 is a top view as seen in the direction of arrow U in FIG. 7, and FIG. 19 is a side view of the main part as seen in the direction of arrow E. In the figure, reference numeral 1 is a disk for recording information, and the lower head 22 and the upper head 32 record / reproduce and erase information. The lower head 22 is adhesively fixed to a gimbal spring 23.
3 is adhered and fixed to the upper surface portion 2b of the carriage 2.
The upper head 32 is adhesively fixed to the upper arm 31, and the upper arm 31 is fixed to the upper arm mounting portion 2f of the carriage 2 with screws 33 and 34.

Reference numeral 11 is a stepping motor for driving the carriage 2 in the radial direction (AB direction) of the disk 1.
Is fixed to the motor holder 13 having the long holes 13a and 13b shown in FIG.
It is fixed to the back surface portion 3a of the frame 3 with screws 14 and 15 that engage with 13b. A lead screw 12 is provided on the shaft portion of the stepping motor 11, and a screw groove 12a is provided on the surface thereof in a spiral shape.

A bearing 16 is fixed to a bearing portion 3b facing the back surface portion 3a of the frame 3 to support the rotation of the lead screw 12. The needle 5 fixed to the needle supporting portion 2a of the carriage 2 is installed in the screw groove 12a.
Are engaged with each other, and the needle 5 is attached so as to relatively slide in the screw groove 12a by the rotation of the stepping motor 11. Reference numeral 6 is a needle pressure spring fixed to the needle support portion 2a, and is composed of the needle 5 and the screw groove 12a.
Hold the engagement of. Reference numeral 4 denotes a guide rod, which is fixed to the bottom surface portion 3c of the frame 3 and is provided with the bearing portion 2 of the carriage 2.
It engages with d and 2e to support the movement of the carriage 2 in the direction of arrow AB.

Reference numeral 41 is an optical sensor, which is adhesively fixed to the slide plate 42. The slide plate 42 has an elongated hole 42a
Are provided and are fixed to the bottom surface portion 3c of the frame 3 by screws 43 and 44. In addition, in the carriage 2,
As the carriage 2 moves in the direction of arrow AB, the optical sensor 41
The flag portion 2c for blocking the optical path portion 41a is provided.

Next, the operation will be described. Disk 1
For recording / reproducing and erasing data on / from, the disk 1 is rotated and the carriage 2 holding the upper and lower heads 32 and 22 is moved by the arrow AB.
This is done by driving in the direction and positioning the upper and lower heads 32, 22 on the tracks formed on the disk 1. The carriage 2 is driven in the direction of arrow AB by rotating the stepping motor 11, and the rotation of the lead screw 12 directly connected thereto causes the needle 5 to relatively slide in the screw groove 12a, at which time the needle 5 receives it. AB
These are driven by directional component forces.

The basic rotation angle of the stepping motor 11 to be driven with respect to one start-up pulse is determined in advance by its structure, and the rotation amount of the stepping motor 11 is controlled by the number of start-up pulses input thereto. To be done. Therefore, the rotation amount is an integral multiple of the basic rotation angle, and the feed amount of the carriage 2 driven by this in the arrow AB direction is also an integral multiple of the basic feed amount driven for one start pulse.

Here, the lead angle of the lead screw 12 is set so that the pitch of the tracks formed on the disk 1 is twice the basic feed amount. As a result, when two starting pulses are input to the stepping motor 11, the carriage 2 is driven in the arrow AB direction by the track pitch formed on the disk 1. Therefore, if the upper and lower heads 32 and 22 are accurately positioned on the tracks formed on the disk 1 in the initial state, thereafter, by inputting a required amount of start pulse to the stepping motor 11, the upper and lower heads 32 and 22 will be moved on each track. It is possible to accurately position the carriage 2 at the position.

FIG. 20 shows the positioning adjustment in the initial state.
23 to 23 will be described. FIG. 20 shows the lower head 22.
FIG. 24 is a schematic diagram showing the positioning error of FIG.
FIG. 8 is a sequence diagram showing positioning adjustment. In FIG. 20, reference numeral 50 is a reference 0 track, which is a reference during adjustment, and 51.
Is the standard 40 tracks. The positioning error that occurs when the lower head 22 is positioned at the target point W on the reference 40 track 51 is the radial direction (arrow AB direction) error S of the disk 1, the circumferential direction error T, and the alignment error within the disk 1 plane. Represented by R.

Among these, the circumferential error T and the alignment error R within the surface of the disk 1 are not adjusted after the device is assembled, and when the lower head 22 is adhesively fixed to the gimbal spring 23, and this gimbal spring 23. When the adhesive is fixed to the upper surface portion 2b of the carriage 2 by fine positioning, adjustment is performed.

Regarding the error S in the radial direction (arrow AB direction) of the disk 1, in the stepping motor 11 having four steps as one cycle, for example, V1 and W1 in FIGS.
Alternatively, the position of the lower head 22 when the stepping motor 11 is driven to the 0 step position indicated by V2 and W2 is set so as to match the target point V on the reference 0 track 50 and the target point W on the reference 40 track 51. Adjust. This adjustment is performed with the stepping motor 11 excited.
The motor holder 13 and the back surface portion 3a of the frame 3 are unscrewed and fixed by the screws 14 and 15, and this is performed by rotating in the arrow LM direction shown in FIG.

When the stepping motor 11 main body is rotated with respect to the frame 3 in the excited state, the lead screw 12 connected to this also rotates similarly to the stepping motor 11 main body. At this time, the reference signal written only in the reference track is reproduced by the lower head 22, and the motor holder 13 is rotated in the arrow LM direction while electrically monitoring the reference signal, thereby changing the step position of the stepping motor 11. It is possible to adjust the position of the carriage 2 in the radial direction (direction of arrow AB) of the carriage 2 without performing the adjustment.

The optical sensor 41 for determining the reference position of the carriage 2 is adjusted after the positioning adjustment of the carriage 2 in the radial direction (arrow AB direction) of the disk 1 is completed. This is the reference 0 track V as shown in FIG.
Is adjusted only so that the step position of the stepping motor 11 is 0 and the signal of the optical sensor is 0. The slide plate 42 holding the optical sensor 41 is attached to the frame 3 with respect to the frame 3. This is adjusted by sliding in the AB direction and changing the position where the flag portion 2c of the carriage 2 shields the optical path portion 41a of the optical sensor 41.

In such a conventional head moving mechanism of the recording / reproducing apparatus, since the lower head 22 is adhered and fixed to the carriage 2, the error T in the disk circumferential direction of the lower head 22 and the in-plane of the disk after the apparatus is assembled. The alignment error R could not be adjusted.

Further, the optical sensor 41 indicating the carriage reference position needs to be adjusted after the positioning adjustment of the carriage 2 in the disk radial direction is completed. Furthermore, the lower head 2
2 is fixed to the carriage 2 by adhesion, the height of the lower head 22 with respect to the disk surface does not change, and the disk 1
When they are attached to or detached from the device, they come into contact with each other and the upper and lower heads 3
2, 22 or disk 1 could be damaged.

Conventional example 2. Next, a head transfer device of a conventional magnetic recording / reproducing apparatus will be described. FIG. 24 is a perspective view showing a head transfer device of a conventional magnetic recording / reproducing apparatus disclosed in, for example, Japanese Utility Model Laid-Open No. 1-107062. In the figure, reference numeral 1 is a disc for recording information, and an upper head 3
2. Recording / reproducing and erasing of information is performed by the lower head 22. The lower head 22 is adhesively fixed to the gimbal spring 23,
The gimbal spring 23 is adhered and fixed to the lower arm 21 which is screwed and fixed to the lower arm mounting portion 2g of the carriage 2, though not shown. The upper head 32 is the upper arm 3
1. The upper arm 31 is adhesively fixed to a plate spring 63 that is elastically deformed in the CD direction.
Is a screw 33 on the upper arm attachment portion 2f of the carriage 2,
It is fixed by 34.

Further, the upper arm 31 has a pointing plate sliding portion 62 on a part thereof, and the frame 3 is displaceable in the direction of arrow CD.
The arm retraction support plate 64 supported with respect to FIG.
As shown in (a) and (b), it is arranged so as to come into contact with the support plate sliding portion 62 of the upper arm 31 in the process of displacing from the lowermost end in the arrow C direction and displace the upper arm 31 in the arrow C direction. Has been done.

Reference numeral 11 shown in FIG. 24 is a stepping motor which drives the carriage 2 in the radial direction of the disk 1 (direction of arrow AB), and the rear surface portion 3a of the frame 3 is provided via a motor holder 61 having mounting holes 61a and 61b. Although not shown in the figure, it is fixed by screwing. A lead screw 12 is provided on the shaft portion of the stepping motor 11, and a screw groove 12a is provided on the surface thereof in a spiral shape.

A bearing 16 is fixed to a bearing portion 3b facing the back surface portion 3a of the frame 3 to support the rotation of the lead screw 12. The needle 5 fixed to the needle supporting portion 2a of the carriage 2 is engaged with the screw groove 12a, and the needle 5 is attached so as to slide relatively in the screw groove 12a by the rotation of the stepping motor 11. Reference numeral 6 denotes a needle pressure spring fixed to the needle support portion 2a, and the needle 5 and the screw groove 12
Hold the engagement of a.

A guide rod 4 is fixed to a bottom surface portion 3c of the frame 3, which is not shown, and engages with a bearing portion of the carriage 2 to support the movement of the carriage 2 in the arrow AB direction.

Reference numeral 41 is an optical sensor, which is fixed to the slide plate 42 by adhesion. The slide plate 42 is fixed to the bottom surface portion 3c of the frame 3 with screws 43. In addition, the carriage 2 has a flag portion 2 that shields the optical path portion 41a of the optical sensor 41 as the carriage 2 moves in the arrow AB direction.
c is provided.

FIG. 26 is a partially cutaway perspective view showing the internal structure of the stepping motor 11. 27 is the same as FIG.
XXVII-XXVII longitudinal view taken along line XXVII, and FIG. 28 is XXVIII of FIG.
In a cross-sectional view taken along the line -XXVIII, 71 is a rotor core fixedly attached to the other end of the lead screw 12 having a screw groove 12a formed at the tip thereof, and further on the outer periphery thereof,
A magnet 72, which is magnetized in a sinusoidal wave form of N-pole to S-pole at every 72 ° in the circumferential direction, is adhered and fixed. The lead screw 12 holding the rotor core 71 and the magnet 72 is rotatably supported by an upper metal bearing 73 fixed to a bracket 75 and a lower metal bearing 74 fixed to a housing 76.

Reference numeral 81 is an A-phase coil, which is an A-phase bobbin 83.
Is wound around the axis of the lead screw 12 that holds the rotor core 71 and the magnet 72.
Further, on the surface facing the magnet 72, the A-phase claw pole 85 composed of the A-phase pole upper portion 85a and the A-phase pole lower portion 85b having the comb tooth-shaped claw poles
The phase bobbin 83 is held.

Similarly, reference numeral 82 is a B-phase coil, which is held by the B-phase bobbin 84 and has its winding wound around the axis of the lead screw 12 holding the rotor core 71 and the magnet 72. Further, the B-phase bobbin 84 has a B-phase pole upper portion 86 having a comb tooth-shaped claw pole on the surface facing the magnet 72.
It is held by a B-phase claw pole 86 composed of a and a B-phase pole lower portion 86b. Here, the A-phase claw pole 85 and the B-phase claw pole 86 are offset from each other by 18 ° around the axis of the lead screw 12, overlapped with each other, and fixed in the housing 76.

Next, the operation will be described. Disk 1
For recording / reproducing and erasing data on / from, the disk 1 is rotated and the carriage 2 holding the upper and lower heads 32 and 22 is moved by the arrow AB.
This is done by driving in the direction and positioning the upper and lower heads 32, 22 on the tracks formed on the disk 1. The carriage 2 is driven in the direction of arrow AB by rotating the stepping motor 11, and the rotation of the lead screw 12 directly connected thereto causes the needle 5 to relatively slide in the screw groove 12a, at which time the needle 5 receives it. It is performed by a component force in the direction of arrow AB.

When the disc 1 is attached to or detached from the apparatus, the arm retraction support plate 64 is displaced in the direction of arrow C in order to avoid interference between the upper and lower heads 32, 22 and the disc 1. As a result, the support plate sliding portion 62 of the upper arm 31 is displaced in the direction of arrow C and the upper arm 31 is lifted in the direction of arrow C, so that the interference between the upper head 32 and the disk 1 is prevented.

When the reference position of the carriage 2 is determined, the position is detected by using the optical sensor 41. this is,
The carriage 2 is driven in the direction of arrow B at the same time as power is supplied,
This is performed by detecting the position where the flag portion 2c provided on the carriage 2 shields the optical path portion 41a of the optical sensor 41. At this time, with the upper arm 31 being lifted in the direction of arrow C, the arm retraction support plate 64 and the upper arm 3 are
The carriage 2 is driven while the support plate sliding portion 62 of No. 1 slides.

FIG. 29 is a view for explaining the operation principle of the stepping motor 11 which drives the carriage 2,
FIG. 27 shows the magnetized states of the surfaces of the A-phase claw pole 85 and the B-phase claw pole 86 shown in FIG. 26 when a current is passed through the phase coil 81 and the B-phase coil 82. Figure 2
9 (a) shows the magnetization state of each claw pole when a current in the same direction is applied to the A-phase coil 81 and the B-phase coil 82. At this time, the magnetic fields formed by the respective claw poles are combined. The S pole center position and the N pole center position of the entire magnetic field created are the I and J positions, respectively.

FIG. 29B shows a case where the current of the A-phase coil 81 is switched in the reverse direction from the state of FIG. 29A. When the current is switched in the opposite direction, the direction of the magnetic field at the center of the A-phase bobbin 83 around which the A-phase coil 81 is wound is reversed, so that the A-phase pole lower portion 85b becomes the N pole,
The upper part 85a of the A-phase pole is magnetized to the south pole. By this excitation switching, the center position of the S pole and the center position of the N pole are changed from K to L.
Move to the right position.

FIG. 29C shows the case where the current of the B-phase coil 82 is further switched in the reverse direction. This time, the direction of the magnetic field at the central portion of the B-phase bobbin 84 around which the B-phase coil 82 is wound is reversed, so that the lower portion of the B-phase pole 86b becomes N.
It becomes a pole, and the upper portion 86a of the B-phase pole is magnetized to the S pole.
By this excitation switching, the S pole center position and the N pole center position are further moved to the right.

In FIG. 29D, the current of the A-phase coil 81 is switched again and the current is passed in the same direction as in FIG. 29A. As a result, the S pole center position and the N pole center position are further moved rightward from the P position to the R position and from the M position to the Q position. The magnet 72 facing the claw poles 85 and 86 and having a sinusoidal magnetization of N pole-S pole in the circumferential direction attracts each other with the magnetic pole center formed by the coil current, and the A-phase coils 81 and B. Phase coil 82
Along with the movement of the center of the magnetic pole due to the switching of the direction of the electric current that is applied to the lead screw 12, the lead screw 12 and the lead screw 12 rotate together to obtain a motor output.

In such a conventional head transfer device for a magnetic recording / reproducing apparatus, when power is supplied to the device and the optical sensor 41 is used to determine the reference position of the carriage 2, the upper arm 31 is moved to the arm retraction support plate 64. The arm retracting support plate 64 and the upper arm 31
The carriage 2 is driven while sliding the support plate sliding portion 62. Therefore, the driving load applied to the stepping motor 11 is larger than that during normal recording and reproduction. Therefore, the stepping motor 11 is selected according to the drive load at the time of start-up when the load is maximum, but if this is driven at a constant voltage, the load applied to the stepping motor 11 during normal recording / reproduction becomes small, An unbalance between the torque generated by the stepping motor 11 and the load torque of the carriage 2 occurs, and abnormal noise or vibration is generated in the sliding portion of the lead screw 12, the guide rod 4, or the like.

Conventional example 3. Next, the position detecting mechanism of the carriage holding the magnetic head of the conventional magnetic recording / reproducing apparatus will be described. FIG. 30 shows, for example, Shoukai 63-176.
FIG. 31 is a perspective view showing a position detecting mechanism of a carriage holding a magnetic head of the conventional magnetic recording / reproducing apparatus shown in Japanese Patent Publication No. 971. FIG. 31 is a front view of the carriage position detecting portion. In FIG. 30, reference numeral 101 denotes a carriage that holds a magnetic head (not shown) and movably supports the magnetic head in a radial direction (AB direction) of a recording medium (not shown), and is configured as follows. There is.

The upper surface portion 1 of the carriage holder 102 rotatably supported by the guide rod 106 in the direction of arrow AB.
02c includes a leaf spring set screw 10 through a leaf spring 103.
The arm 104 is fixed by 5a and 105b.
Further, on one side surface portion 102a of the carriage 102,
A sensor flag unit 102d is provided. A slide plate 111 fixedly supports the optical sensor 113. As shown in FIG. 31, the slide plate 111 is attached to the main body frame 117 by the arrow AB of the carriage 101.
With the movement in the direction, the sensor flag portion 102d passes through the sensor flag passage portion 113b, and the slide plate 111 is arranged so that the light emitted from the light emitting portion 113a is blocked by the sensor flag portion 102d. The slide plate 111 provided with the long hole portion 111a is fitted with the guide pin 118a fixed to the main body frame 117 and the slide plate set screw 112, and is supported so as to be movable and adjustable in the arrow AB direction. A circuit board 115 is fixed to the bottom surface 117c of the main body frame 117 by set screws 116a, 116b, and 116c. Optical sensor 1
13 and the circuit board 115 are electrically connected by a flexible lead 114.

FIG. 32 is a front view of another conventional carriage position detector, in which the optical sensor 113 and the circuit board 115 are arranged.
Mounted on the circuit board 115, and the long holes 115a and 115b provided on the circuit board 115 and the guide pins 118a and 11
8b and the set screws 119a and 119b are fitted to each other, so that the circuit board 115 is movably supported in the arrow AB direction.

Next, the operation will be described. The position of the carriage 101 in the recording medium radial direction (arrow AB direction) is detected when the carriage 101 is positioned at a certain specific position with respect to the recording medium.
The light emitted from 3a is blocked by the sensor flag portion 102d of the carriage holder 102, and the position is detected by electrically monitoring the light. Therefore, when positioning the carriage 101 at the reference position of the recording medium, when the carriage 101 is at the reference position of the recording medium, the sensor flag portion 102d of the carriage holder 102
Adjusts the position of the optical sensor 113 in the recording medium radial direction (arrow AB direction) so that the light emitted from the light emitting portion 113a of the optical sensor 113 is blocked.

In this adjustment, the reference signal of the reference disk for adjustment prepared in advance is read by the magnetic head, the carriage 101 is arranged at the reference position of the recording medium, and then,
In the conventional example shown in FIG. 31, the slide plate 111 having the optical sensor 113 mounted thereon is slid in the arrow AB direction on the circuit board 115 having the optical sensor 113 mounted in the conventional example shown in FIG. The sensor flag portion 102d of the light sensor 102 includes the light emitting portion 1 of the optical sensor 113.
13a is adjusted while being electrically monitored so that the light emitted from 13a is shielded.
Alternatively, set screws 119a and 119b are used to fix this.

In the carriage position detecting mechanism of such a conventional magnetic recording / reproducing apparatus, when the optical sensor 113 is positioned and adjusted, the slide plate or the circuit board on which the optical sensor 113 is mounted is moved in the recording medium radial direction (arrow AB). The adjustment resolution at this time needs to be equal to or smaller than the radial pitch of the signal tracks written on the recording medium, and the accuracy of the micrometer is required. When adjusting by sliding in the direction of arrow AB, the slide feed amount of this slide plate or the circuit board becomes the adjustment amount as it is. Therefore, the feed amount of the slide plate 111 on which the optical sensor is mounted or the circuit board 115 is adjusted by the micrometer. It had to be controlled in units and adjustment was very difficult.

In addition, when the adjustment is automated, the adjustment action point is set on the slide plate 111 or the circuit board 115 to adjust this position. When the adjustment is performed by sliding in the AB direction, the slide plate is adjusted. Since 111 or the entire circuit board 115 moves, the position of the adjustment action point is not uniquely determined with respect to the main body frame 117 in the assembled state before adjustment, and when the adjustment action point is chucked by an automatic machine, Positioning was difficult.

Further, the position of the adjusting action point is the body frame 1
In the case of being inside 17, the chucking of the adjusting action point in the assembled state before adjustment becomes difficult as the component mounting density of the apparatus increases.

[0041]

In the conventional head moving mechanism of the recording / reproducing apparatus as described above, in order to adhere and fix the lower head to the carriage, the disk circumferential error T of the lower head after assembly of the apparatus and the disk error in the disk. There is a problem that the in-plane alignment error R cannot be adjusted.

Further, the optical sensor indicating the carriage reference position needs to be adjusted after the positioning adjustment of the carriage in the disk radial direction is completed. Further, since the lower head is adhesively fixed to the carriage, the height of the lower head with respect to the disk surface does not change, and when the disk is attached to or detached from the apparatus, the two may come into contact with each other and the head or the disk may be damaged. There was a problem.

In the conventional head transfer device of the magnetic recording / reproducing apparatus, the upper arm is lifted by the arm retracting support plate at the time of start-up when power is supplied to the apparatus and the reference position of the carriage is determined using the optical sensor. The carriage is driven while the arm retraction support plate and the support plate sliding portion of the upper arm slide. Therefore, the driving load applied to the stepping motor becomes larger than that during normal recording and reproduction. Therefore, the stepping motor is selected according to the drive load at the time of start-up when the load is maximum, but if this is driven at a constant voltage, the load applied to the stepping motor during normal recording and reproduction will be small, so the stepping motor will be selected. There is a problem in that the generated torque and the carriage load torque are unbalanced, and abnormal noise or vibration occurs in the sliding portion of the lead screw, the guide rod, or the like.

In the conventional carriage position detecting mechanism of the magnetic recording / reproducing apparatus, when positioning and adjusting the optical sensor,
The slide plate or the circuit board on which the optical sensor is mounted is slid in the recording medium radial direction (arrow AB direction) for adjustment. The adjustment resolution at this time is the radial direction of the signal track written on the recording medium. The pitch needs to be equal to or less than the pitch, and the accuracy of the micrometer is required. When adjusting by sliding in the direction of arrow AB, the slide feed amount of this slide plate or the circuit board becomes the adjustment amount as it is. Therefore, the feed amount of the slide plate on which the optical sensor is mounted or the feed of the circuit board is in units of micrometer. There is a problem in that adjustment is extremely difficult because it needs to be controlled.

When the adjustment is automated, the adjustment action point is set on the slide plate or the circuit board to adjust this position. When the adjustment is performed by sliding in the AB direction, the slide plate or the circuit is used. Since the entire board moves, the position of the adjustment action point is not uniquely determined with respect to the body frame in the assembled state before adjustment, and it becomes difficult to position the adjustment action point when chucking the adjustment action point with an automatic machine. There was a problem.

Further, when the position of the adjusting action point is inside the main body frame, it is difficult to chuck the adjusting action point in the assembled state before adjustment as the component mounting density of the apparatus increases. there were.

The present invention has been made in order to solve the problems of the head transfer mechanism of the conventional recording / reproducing apparatus as described above, and the positioning adjustment of the lower head after the apparatus is assembled is as follows.
The objective is to obtain a highly reliable head transfer mechanism for a recording / reproducing apparatus that can be adjusted not only in the radial direction of the disc but also in the circumferential direction of the disc and in the angular direction within the disc surface, without adjusting the optical sensor indicating the carriage reference position. And

Further, the present invention has been made in order to solve the above-mentioned problems of the head transfer device of the conventional magnetic recording / reproducing apparatus, and the maximum stepping motor corresponding to the driving load applied to the stepping motor. To obtain a stepping motor that can switch the generated torque,
Another object of the present invention is to obtain a head transfer device of a magnetic recording / reproducing device that suppresses the generation of abnormal noise and vibration using this motor.

Further, the present invention has been made to solve the problems of the carriage position detecting mechanism of the conventional magnetic recording / reproducing apparatus as described above, and a minute adjustment for position adjustment at the time of adjusting the carriage position detecting mechanism. An object of the present invention is to obtain a carriage position detection mechanism of a magnetic recording / reproducing apparatus that can be easily fed and can be easily positioned for adjustment even when performing automatic adjustment.

[0050]

A head transfer mechanism for a recording / reproducing apparatus according to the present invention comprises an upper and lower arm for holding a plurality of upper and lower heads facing the front and back surfaces of the disk, and a radial arm of the upper and lower arm for holding the upper and lower arm. A carriage for transfer, a drive motor for the carriage, a lead screw shaft that engages with the needle portion of the carriage to transmit a driving force to the carriage, and a frame that holds these. Positioning and adjusting the drive motor with respect to the frame. Without mounting, the lower arm is supported relative to the carriage so that translational movement in the disk radial direction, circumferential direction, and rotational movement within the disk plane can be adjusted, and after adjustment, the lower arm is fixed to the carriage. It is configured to be possible.

An optical sensor for detecting the reference position of the carriage with respect to the disk is attached and fixed to the frame without positioning adjustment, and the arm is translated relative to the carriage in the disk radial direction and the circumferential direction, and the disk is moved. It is configured such that it is supported so that the rotational movement can be adjusted in the plane, and after the adjustment, the arm can be fixed to the carriage.

Further, the carriage holds it through a leaf spring-like elastic body fixed to the arm, and the elastic body is moved in translation in the disk radial direction and the circumferential direction with respect to the carriage.
Also, the elastic body is supported so as to be adjustable in rotational movement within the disk surface, and after adjustment, the elastic body can be fixed to the carriage.

The stepping motor according to the present invention is configured such that each coil inside the stepping motor is divided into a plurality of windings, and the coil to be energized can be energized to the coil selected according to the load.

When the phase coils divided into a plurality of parts inside the stepping motor are made of materials having the same number of turns and different wire diameters or different electric resistance values, and the same drive voltage is applied. It is configured such that the amount of energization changes and the generated torque differs.

Further, the stepping motor configured as described above is used as a driving device of a mechanism for moving the recording / reproducing head with respect to the disk-shaped recording medium so as to advance and retreat in the radial direction, and a torque according to the load is applied. The coil of each phase is selected so as to generate electricity and is energized.

The carriage position detecting mechanism of the magnetic recording / reproducing apparatus according to the present invention rotates an optical sensor, which holds the magnetic head and detects the position of the carriage moving in the radial direction of the recording medium, with respect to the recording medium, on the main body frame. The circuit board is movably held on the circuit board so that the circuit board can be rotated and adjusted, and the circuit board can be fixed to the body frame at an arbitrary rotating position.

Further, the distance between the rotation action point position and the rotation center position for rotating the circuit board is larger than the distance between the rotation center position of the circuit board and the optical sensor mounted on the circuit board. The rotational action point position is determined so that

Further, an adjusting screw having a sliding contact area whose diameter changes in the direction of the central axis of rotation of the circuit board is brought into sliding contact with the side surface of the circuit board by elastic force, and the adjusting screw is moved in the axial direction. The circuit board is configured to rotate.

Further, the tip end of the adjusting screw movable in the direction perpendicular to the central axis of the circuit board rotation is brought into contact with the side surface of the circuit board with an elastic force, and the adjusting screw engaged with the main body frame, The circuit board is configured to rotate by adjusting movement in the axial direction.

[0060]

The head transfer mechanism of the recording / reproducing apparatus of the present invention enables the lower arm holding the lower head to move in translation in the disk radial direction and the circumferential direction with respect to the carriage, and to rotate in the disk plane. Since it is configured to support and displace the lower arm relative to the carriage, positioning adjustment of the lower head after device assembly can be performed not only in the disk radial direction but also in the disk circumferential direction and the angular direction within the disk plane. It will be adjustable.

If the carriage reference position is determined based on the position where the optical sensor is mounted during assembly, the arm can be displaced relative to the carriage without adjusting the position of the optical sensor after assembly. Adjustments can be made.

Further, the carriage is held via a leaf spring-like elastic body fixed to the arm, and the elastic body is translated with respect to the carriage in the disk radial direction and the circumferential direction, and is rotated in the disk plane. Since it is movably supported and the elastic body can be adjusted in displacement relative to the carriage, the head is moved out of the disk surface with respect to the carriage in a state other than recording / reproduction after positioning adjustment. It is possible to displace.

In the stepping motor according to the present invention, the magnitude of the generated torque can be changed by selecting a plurality of divided coils and energizing them.

Further, since the divided coils of the respective phases have different resistance values, different torques are generated when the same drive voltage is applied to the respective coils.

Further, in the recording / reproducing head transfer device using the stepping motor configured as described above, the coils of each phase are selected and energized so as to generate the torque according to the magnitude of the load. The torque generated by the stepping motor at a certain step rate balances with the carriage drive load increased compared to the steady state, and it is possible to prevent abnormal noise and vibration from occurring in the sliding parts such as the lead screw and guide rod. .

The carriage position detecting mechanism of the magnetic recording / reproducing apparatus of the present invention rotatably supports the circuit board on which the optical sensor is mounted, so that the positioning of the optical sensor with respect to the radial direction of the recording medium is rotated. It is configured so that it can be performed by moving the circuit board, and a rotation action point position for rotating the circuit board with respect to the rotation center position of the circuit board and the distance between the sensors mounted on the circuit board. If the position of the rotation action point is determined so that the distance between the rotation center positions becomes large, the displacement amount of the optical sensor becomes smaller according to the distance ratio than the displacement amount at the rotation action point. It becomes possible to easily carry out the minute feed of the sensor in the AB direction.

In addition, when the circuit board rotates due to the displacement of the rotation action point which comes in sliding contact with the adjustment screw attached to the main body frame, the adjustment point should be displaced with respect to the main body frame. Instead, it is always constant, so positioning during adjustment can be performed easily.

[0068]

【Example】

Example 1. 1 is a perspective view showing a head moving mechanism of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention, FIG. 2 is a bottom view seen from the direction of arrow C shown in FIG. 1, and FIG. FIG. 4 is a side view of the main part as seen, and FIG. 4 is a side view of the main part as seen from the arrow E direction. In the figure, the same or corresponding portions as those of the conventional magnetic recording / reproducing apparatus are designated by the same reference numerals and the description thereof will be omitted.

In the figure, reference numeral 21 is a lower arm, to which a gimbal spring 23 to which a lower head 22 is adhered and fixed is adhered and fixed. As shown in detail in FIG. 2, the lower arm 21 is provided with adjustment holes 21a and 21b for position adjustment, and screws 24 and 25 are attached to the lower arm attachment portion 2g of the carriage 2 via a pressing metal plate 26. Fixed by. Further, the stepping motor 11 has a motor holder 13
It is fixed to the back surface portion 3a of the frame 3 by means of screws 14 and 15.

Next, the operation will be described. Lower arm 2
When the screws 24 and 25 attaching 1 to the lower arm attachment portion 2g of the carriage 2 are loosened from the carriage 2, the lower arm 21 is adjusted to the adjustment holes 21a and 21 for position adjustment.
Depending on the clearance between b and the screws 24 and 25, the disk 2 is moved relative to the carriage 2 in the disk radial direction (arrow AB direction), the circumferential direction (arrow HI direction), and the alignment direction (arrow FG direction) shown in FIG. Can be displaced.

As a result, the initial positioning adjustment of the lower head 21 can be performed in the radial direction of the disk 1, the circumferential direction, and the alignment direction within the surface of the disk 1 after the device is assembled. It is possible to omit the head positioning step that has been adjusted by fine positioning when the 22 is adhesively fixed to the gimbal spring 23 and when the gimbal spring 23 is adhesively fixed to the upper surface portion 2b of the carriage 2.

Example 2. FIG. 5 is a perspective view showing a head moving mechanism of a magnetic recording / reproducing apparatus according to a second embodiment of the present invention. A slide plate 42 holding an optical sensor is fixed to a bottom surface portion 3c of a frame 3 by a screw 43. .

Next, the operation will be described. In the conventional example and the first embodiment of the present invention, the optical sensor 41 that determines the reference position of the carriage 2 is adjusted by the disc 1 of the carriage 2.
The adjustment is performed after the positioning adjustment in the radial direction (arrow AB direction), the circumferential direction (arrow HI direction), and the alignment direction (arrow FG direction) is completed, but according to the following procedure, the adjustment of the optical sensor 41 is omitted. It will be possible.

FIG. 6 is a diagram showing the sequence. When the stepping motor 11 is driven and the carriage 2 is moved in the direction of arrow B approaching the optical sensor 41, the flag portion 2c of the carriage 2 causes the optical sensor 41 to move. The optical path portion 41a is blocked and the signal of the optical sensor 41 is switched from 1 to 0 at the point X. Considering further movement in the direction of arrow B from this X point, the step position of the stepping motor 11 becomes 0 next Y
The carriage 2 is moved to the point, and this position is set as the position of the carriage 2 on the reference 0 track. In this state, since the lower head 22 is not positioned at the reference 0 track position of the disk 1, the lower arm 21 is relatively displaced with respect to the carriage 2 by the procedure shown in the first embodiment. It becomes possible to carry out the positioning adjustment of 22.

Example 3. FIG. 7 is a bottom view showing a head moving mechanism of a magnetic recording / reproducing apparatus according to a third embodiment of the present invention, and FIGS. 8 and 9 are side views showing the head moving mechanism in the direction of arrow D. In the figure, 27 is a leaf spring-like elastic body,
As shown in FIG. 9, the lower arm 21 is adhesively fixed by elastically deforming in the disk out-of-plane direction (arrow JK direction). The elastic body 27 is provided with adjusting holes 27a and 27b for position adjustment, and is fixed to the bottom surface portion 2j of the carriage 2 with screws 24 and 25 via a pressing metal plate 26. In this state, the pressing force of the elastic body 27 in the direction of arrow J acts on the lower arm 21, so that the lower arm 21 is attached to the lower arm mounting portion 2
The protrusions 2h and 2i provided on g are brought into contact with each other to perform positioning in the disc surface out-of-plane direction (arrow JK direction).

Next, the operation will be described. Elastic body 27
Is a screw 24 attached to the bottom surface 2j of the carriage 2,
When the engagement of 25 with the carriage 2 is released, the elastic body 2
7 is adjustment holes 27a and 27b for position adjustment and screws 24,
According to the gap of 25, the disk 2 can be displaced relative to the carriage 2 in the radial direction (arrow AB direction), the circumferential direction (arrow HI direction), and the alignment direction (arrow FG direction). This makes it possible to perform the initial positioning adjustment of the lower head 21 in the radial direction of the disk 1, the circumferential direction, and the alignment direction within the surface of the disk 1 after the device is assembled.

Further, after the positioning adjustment, although not shown, by applying an acting force in the arrow K direction against the lower arm 21 against the pressing force of the elastic body 27 in the J direction, the lower head 2
2 with respect to the carriage 2 in the direction out of the disc surface (arrow JK
Direction).

Example 4. FIG. 10 is a vertical sectional view showing a stepping motor according to a fourth embodiment of the present invention. In the figure, the same or corresponding parts as those of the conventional magnetic recording device shown in FIGS. 26 to 28 are designated by the same reference numerals and the description thereof will be omitted. Reference numeral 81a denotes an A-phase inner circumference side coil wound on the inner circumference side of the A-phase bobbin 83, and an A-phase outer circumference side coil 81b is wound outside the partitioning portion 83a of the A-phase bobbin 83. The A-phase inner circumference side coil 81a and the A-phase outer circumference side coil 81b are insulated from each other, and coil terminals (not shown) are respectively connected to the power supply circuit.

Similarly, reference numeral 82a denotes a B-phase inner peripheral side coil wound on the inner peripheral side of the B-phase bobbin 84, and the B-phase outer peripheral side coil 8 is provided outside the partition part 84a of the B-phase bobbin 84.
2b is wound. The B-phase inner circumference side coil 82a and the B-phase outer circumference side coil 82b are insulated from each other, and coil terminals (not shown) are respectively connected to the power supply circuit.

Next, the operation will be described. When the stepping motor 11 is driven using only the A-phase inner circumference side coil 81a and the B-phase inner circumference side coil 82a, the stepping motor 11 is driven by switching the energization direction of each phase coil as in the conventional example. It is possible.

When the stepping motor 11 is driven by using only the A-phase outer peripheral coil 81b and the B-phase outer peripheral coil 82b, the stepping motor 11 can be driven by switching the energizing direction of each phase coil. You can

Next, when the stepping motor 11 is driven by using all the coils of the A-phase inner circumference side coil 81a, the A-phase outer circumference side coil 81b, the B-phase inner circumference side coil 82a, and the B-phase outer circumference side coil 82b. Among the coils independently connected to the power supply circuit, the A-phase inner circumference side coil 8
1a and the A phase coil 81 of the A phase outer circumference coil 81b, and the B phase coil 82 of the B phase inner circumference side coil 82a and the B phase outer circumference side coil 82b are considered to be one coil, respectively, and four coils are arranged in the same sequence as above. If you switch the current and energize,
The stepping motor 11 can be driven.

At this time, when all the driving voltages applied to the respective coils are made constant, the magnetomotive force indicated by the product of the current value flowing around the A-phase claw pole 85 and the B-phase claw pole 86 and the number of coil turns is compared. When starting the stepping motor 11 using only the coils on the inner circumference side of each phase,
In contrast to the case where the stepping motor 11 is started by using only the coils on the outer circumference side of each phase, the case where the stepping motor 11 is started by using all the coils obviously has the largest magnetomotive force. The strength of the magnetic field generated at the center of the bobbin increases, and the maximum torque generated by the stepping motor correspondingly increases.

At the time of normal recording / reproduction, the A-phase inner circumference side coils 81a and B are set at a predetermined step rate.
The stepping motor 11 is driven using only the phase inner circumference side coil 82a. At this time, the electric resistance value and the number of turns of each coil are selected in advance so that the torque generated by the stepping motor is balanced with the steady load during recording and reproduction.

Further, when the carriage driving load acting on the stepping motor increases with respect to the steady load during recording / reproducing, all coils including the A-phase outer peripheral coil 81b and the B-phase outer peripheral coil 82b are activated when the apparatus is started. By energizing, the total amount of current flowing through each phase coil is increased. Here, the electric resistance value and the number of turns of each outer peripheral side coil are selected so that the torque generated by the stepping motor and the carriage driving load increased compared to the steady state are balanced.
As a result, it is possible to suppress the generation of abnormal noise and vibration in sliding parts such as the lead screw and the guide rod.

Example 5. FIG. 11 is a vertical sectional view showing a stepping motor according to a fifth embodiment of the present invention. 81a
Is an A-phase inner circumference side coil wound around the inner circumference side of the A-phase bobbin 83, and has a larger wire diameter than the A-phase inner circumference side coil 81a on the outer side of the partition section 83a of the A-phase bobbin 83. The A-phase outer peripheral coil 81c is wound with the same number of turns as the A-phase inner peripheral coil 81a. The A-phase inner circumference side coil 81a and the A-phase outer circumference side coil 81c are insulated from each other, and coil terminals (not shown) are respectively connected to the power supply circuit.

Similarly, reference numeral 82a denotes a B-phase inner peripheral side coil wound around the inner peripheral side of the B-phase bobbin 84, and the B-phase inner peripheral side coil 8 is provided outside the partition portion 84a of the B-phase bobbin 84.
The B-phase outer circumference side coil 82c having a larger wire diameter than 2a is wound with the same number of turns as the B-phase inner circumference side coil 82a. The B-phase inner circumference side coil 82a and the B-phase outer circumference side coil 82c are insulated from each other, and coil terminals (not shown) are respectively connected to the power supply circuit.

Next, the operation will be described. The driving voltage applied to each coil is constant and the A-phase claw pole 8
5 and the magnetomotive force indicated by the product of the current value flowing around the B-phase claw pole 86 and the number of coil turns, respectively, the outer coil has the same number of turns as the inner coil and the wire diameter is Since it is thick, the electric resistance value becomes small and the value of the electric current to be supplied increases. Therefore, the magnetomotive force becomes larger when the stepping motor 11 is started up using only the coils on the outer circumference side of each phase than when the stepping motor 11 is started up using only the coils on the inner circumference side of each phase. The strength of the magnetic field generated at the center of the wound bobbin increases, and the maximum generated torque value of the stepping motor correspondingly increases.

At the time of normal recording / reproduction, the A-phase inner circumference side coils 81a and B are set at a predetermined step rate.
The stepping motor 11 is driven using only the phase inner circumference side coil 82a. At this time, the electric resistance value and the number of turns of each coil are selected in advance so that the torque generated by the stepping motor is balanced with the steady load during recording and reproduction.

Further, when the carriage drive load acting on the stepping motor increases with respect to the steady load during recording and reproduction, when the apparatus is started, the A-phase outer circumference side coil 81c and the B-phase outer circumference are set under a certain step rate. Side coil 82
The stepping motor 11 is driven using only c. At this time, the electric resistance value and the number of turns of each coil are selected in advance so that the torque generated by the stepping motor is balanced with the carriage drive load that is higher than the steady load during recording and reproduction. As a result, it is possible to suppress the generation of abnormal noise and vibration in sliding parts such as the lead screw and the guide rod.

In the fifth embodiment, the wire diameter of each phase outer circumference side coil is made larger than the wire diameter of the inner circumference side coil. However, conversely, the wire diameter of each phase inner circumference side coil is changed to the outer circumference side coil. The same effect can be obtained by making the coil thicker than the wire diameter and inverting the coil for energization.

Example 6. In the fifth embodiment, the coils 81a, 82a on the inner side of each phase and the coils 81c, 8 on the outer side of each phase are provided.
The difference in the magnetomotive force of 2c was configured by utilizing the change in electric resistance value due to the wire diameter difference between the outer coil and the inner coil.
You may comprise as follows. In FIG. 10, the wire rods of the coils 81a and 82a on the inner side of each phase and the wire rods of the coils 81b and 82b on the outer side of each phase are made of materials having different electric resistance values. If the number of turns of the inner circumference side coil is made equal, the same effect as that of the fifth embodiment can be obtained.

Example 7. FIG. 12 is a front view showing a carriage position detecting mechanism of a magnetic recording / reproducing apparatus according to a seventh embodiment of the present invention. In the drawing, the same or corresponding members as those of the carriage position detecting mechanism of the conventional magnetic recording / reproducing apparatus are designated by the same reference numerals, but since they have already been described, the description thereof will be omitted. Reference numeral 120 denotes a rotation support pin, and the circuit board 115 is pivotally supported around the pin so as to be rotatable in the plane of the board. Reference numeral 115a denotes an elongated hole portion provided on the circuit board 115. The elongated hole portion 115a and the guide pin 118 are provided.
a and a set screw 119a are fitted together.

Next, the operation will be described. Set screw 1
When the engagement between 19a and the circuit board 115 is loosened, the circuit board 1
15 can be rotated around the rotation support pin 120. When the circuit board 115 is rotated, the optical sensor 113 mounted on the circuit board 115 is also rotated around the rotation support pin 120 in the arrow CD direction. If the rotation in the direction of arrow CD is minute, this corresponds to the slide feed in the direction of arrow AB.
By rotating 5 the positioning of the carriage position detection mechanism can be adjusted.

Example 8. 13 is a front view showing a carriage position detecting mechanism of a magnetic recording / reproducing apparatus according to an eighth embodiment of the present invention. In the figure, 121 is a rotation action hole that gives an adjustment action force when the circuit board 115 is rotated,
The distance from the rotation support pin 120 is I, and the rotation support pin 120 is
The distance between the optical sensor 113c and the optical sensor 113c is indicated by J, and the three points of the rotation support pin 120, the rotation action hole 121, and the optical axis 113c of the optical sensor are arranged so that the distance J becomes smaller than the distance I. .

Next, the operation will be described. Set screw 1
Loosen the engagement between 19a and the circuit board 115,
When the circuit board 115 is rotated in the direction of the arrow EF around the rotation support pin 120 by applying the adjusting force to No. 1, the optical sensor 113 mounted on the circuit board 115 is also rotated support pin as in the seventh embodiment. It rotates in the direction of arrow HG around 120. At this time, the displacement amount of the rotation action hole 121 in the arrow AB direction,
Comparing the amount of displacement of the optical axis 113c of the optical sensor in the direction of arrow AB, the ratio is the distances I and J from the rotation support pin 120.
Proportional to. Therefore, when the distance I is larger than J, the displacement amount of the optical axis 113c of the optical sensor in the arrow AB direction becomes smaller than the displacement amount of the rotation action hole 121 in the arrow AB direction, and the arrow AB caused by the rotation action hole 121. The positioning adjustment of the optical axis 113c of the optical sensor in the direction of arrow AB, which is a minute amount with respect to the adjustment movement amount in the direction, can be easily performed.

Example 9. 14 is a front view showing a carriage position detecting mechanism of a magnetic recording / reproducing apparatus according to a ninth embodiment of the present invention, and FIG. 15 is a circuit board V notch portion 11 in FIG.
FIG. 5D is a sectional view taken along the line XV-XV of FIG. In the figure, the adjusting screw 122 engages with the screw portion 117d because it is provided on the main body frame 117 at the screw portion 122b, and is movable in the arrow PQ direction shown in FIG. Further, the countersunk head portion 122a of the adjusting screw 122 is in contact with the V notch portions 115d and 115e provided on the circuit board 115. Further, one end of the pressing spring 124 is fixed to a supporting portion 117f of the main body frame facing the adjusting screw 122, and the rotation support pin 120 is fixed to the circuit board 115.
Rotational pressure is applied in the direction of the arrow F around it.

Next, the operation will be described. Circuit board 1
The V-notch portions 115d and 115e of the plate 15 have a dish head 122a.
When the adjusting screw 122 contacting with is pushed in the direction of the arrow Q, the V notch portions 115d and 115e of the circuit board 115 are pushed by the dish head 122a of the adjusting screw 122, and the rotation support pin 12
The circuit board 115 rotates in the direction of arrow E with 0 as the center of rotation. When the adjusting screw 122 is returned in the direction of arrow P, the circuit board 115 is rotated in the direction of arrow F around the rotation support pin 120 of the pressing spring 124 in the direction of arrow F with the rotation support pin 120 as the center of rotation. Rotate. As a result, Example 7
Similarly, the positioning adjustment of the optical sensor 113 in the arrow AB direction can be easily performed by adjusting the screwing amount of the adjusting screw 122 that is always present at a constant adjusting position with respect to the main body frame 117.

Example 10. FIG. 16 shows a first embodiment of the present invention.
16 is a front view showing the carriage position detecting mechanism of the magnetic recording / reproducing apparatus according to 0, and the same reference numerals as those in FIG. 16 denote the same portions. In the figure, reference numeral 123 is an adjusting screw, and its screw portion 123b engages with a screw portion 117e provided on the frame back surface 117a, and the tip portion 123a has a tip portion 123a.
It is in contact with the side surface portion 115 f of 15. Also, the push spring 1
24 has one end fixed to a supporting portion 117f of the main body frame facing the adjusting screw 122, and the circuit board 115
A rotation pressure is applied in the direction of arrow F around the rotation support pin 120.

Next, the operation will be described. Adjustment screw 1
When 23 is pushed in the direction of the arrow E, the circuit board 115 is slidably in contact with the tip portion 123a of the side surface portion 11 of the circuit board 115.
5f is made into an action point, and it rotates in the arrow E direction centering around the rotation support pin 120. In addition, adjust screw 123 with arrow F
Returning to the direction, the circuit board 115 is rotated in the arrow F direction with the rotation support pin 120 as the rotation center due to the pressurization of the pressing spring 124 around the rotation support pin 120 in the arrow F direction. As a result, similarly to the seventh embodiment, the positioning adjustment of the optical sensor 113 in the arrow AB direction can be easily performed by adjusting the adjusting screw 123, which is always present at a constant adjusting position with respect to the main body frame 117, from the outside of the main body frame 117. It becomes possible to do it.

[0101]

As described above, in the head transfer mechanism of the recording / reproducing apparatus according to the present invention, the lower arm holding the lower head is translated in the disk radial direction and the circumferential direction with respect to the carriage, and in the disk plane. Since the lower arm is rotatably supported and the lower arm is displaced relative to the carriage, the lower head can be positioned and adjusted after the device is assembled, in addition to the disk radial direction and the disk circumferential direction and disk surface. The effect is that it can be adjusted in the angle direction within.

Further, if the reference position of the carriage is determined based on the position where the optical sensor is attached at the time of assembling, and the arm is relatively displaced with respect to the carriage based on this reference position, the adjustment is performed. This has the effect of omitting the subsequent positioning adjustment of the optical sensor.

Further, the carriage is held via the elastic body of the leaf spring plate fixed to the arm, and the elastic body is translated with respect to the carriage in the disk radial direction and the circumferential direction, and is rotated in the disk plane. Since the movable body is supported and the displacement of the elastic body can be adjusted relative to the carriage, the head is placed outside the disk surface with respect to the carriage in a state other than recording / reproduction after positioning adjustment. It is possible to displace the disc in the direction, and it is possible to prevent the head or the disc from being damaged due to contact between the two when the disc is attached to or detached from the device.

In the stepping motor according to the present invention, since the coils of each phase are divided into a plurality of parts, there is an effect that the magnitude of the torque generated can be changed by selecting the coils of each phase to be energized.

Since the divided coils have the same number of turns and different resistances, different torques can be generated when the same drive voltage is applied.

Further, in the head transfer device of the magnetic recording / reproducing apparatus according to the present invention, each phase coil inside the stepping motor is divided into an inner peripheral side coil and an outer peripheral side coil and wound.
Since it is configured so that the energization can be switched for each coil, if the coil to be energized is selected in each phase,
The amount of current flowing in each phase coil can be switched under a constant drive voltage, the strength of the magnetic field generated in the center of the bobbin around which the coil is wound changes, and the maximum torque generated by the stepping motor can be changed. effective.

During normal recording / reproduction, the energizing coil is selected so that the torque generated by the stepping motor at a predetermined step rate is balanced against the steady load, and the carriage driving load acting on the stepping motor is recorded / reproduced. The coil of each phase is selected so that the current flowing through the coil increases when the load exceeds the steady load at that time, and the strength of the magnetic field generated at the center of the bobbin is increased. As a result, the maximum torque generated by the stepping motor can be increased, and the torque generated by the stepping motor at a certain specified step rate balances with the carriage drive load increased more than in the steady state, and the lead screw, guide rod, etc. There is an effect that it is possible to prevent abnormal noise and vibration from occurring in the sliding portion.

The carriage position detecting mechanism of the magnetic recording / reproducing apparatus according to the present invention has an optical sensor for holding the magnetic head and moving it in the radial direction of the recording medium on the circuit board to detect the position of the carriage with respect to the recording medium. Since the circuit board is rotatably supported in the plane of the board and can be fixed to the main body frame at an arbitrary rotating position, the position adjustment of the optical sensor in the recording medium radial direction is adjusted by rotating the circuit board. It becomes possible by doing so. Therefore, the distance between the rotation action point position and the rotation center position for rotating the circuit board should be larger than the distance between the rotation center position of the circuit board and the optical sensor mounted on the circuit board. When the position of the rotation action point is determined, the displacement amount of the optical sensor becomes smaller with respect to the displacement amount at the rotation action point in accordance with the distance ratio, so that it is easy to perform minute feeding of the optical sensor in the radial direction of the recording medium. The effect is that it can be implemented.

Further, an adjusting screw having a sliding contact area whose diameter changes in the central axis direction of rotation of the circuit board is slidably brought into contact with the side surface of the circuit board by elastic force to move the adjusting screw in the axial direction. The circuit board is configured to rotate, or the side surface of the circuit board is brought into contact with the circuit board so that the circuit board is rotated by moving in the axial direction of the adjusting screw. There is an effect that the adjustment action point can be easily positioned at the time of adjustment without constantly displacing with respect to the main body frame.

[Brief description of drawings]

FIG. 1 is a perspective view showing a head moving mechanism of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a bottom view showing the head transfer mechanism of the magnetic recording / reproducing apparatus in Embodiment 1. FIG.

FIG. 3 is a side view of essential parts showing a head moving mechanism of the magnetic recording / reproducing apparatus in Embodiment 1.

FIG. 4 is a side view of essential parts showing a head moving mechanism of the magnetic recording / reproducing apparatus in Embodiment 1.

FIG. 5 is a perspective view showing a head moving mechanism of the magnetic recording / reproducing apparatus in Embodiment 2 of the present invention.

FIG. 6 is a sequence diagram showing a method for adjusting a head moving mechanism of the magnetic recording / reproducing apparatus according to the second embodiment.

FIG. 7 is a bottom view showing the head moving mechanism of the magnetic recording / reproducing apparatus in Embodiment 3 of the present invention.

FIG. 8 is a side view showing a head transfer mechanism of the magnetic recording / reproducing apparatus in Example 3.

FIG. 9 is a side view showing a head transfer mechanism of the magnetic recording / reproducing apparatus in Example 3.

FIG. 10 is a vertical sectional view of a stepping motor according to a fourth embodiment of the present invention.

FIG. 11 is a vertical sectional view of a stepping motor according to a fifth embodiment of the present invention.

FIG. 12 is a front view showing a carriage position detecting mechanism of a magnetic recording / reproducing apparatus according to a seventh embodiment of the present invention.

FIG. 13 is a front view showing a carriage position detecting mechanism of a magnetic recording / reproducing apparatus according to an eighth embodiment of the present invention.

FIG. 14 is a front view showing a carriage position detecting mechanism of a magnetic recording / reproducing apparatus of Example 9 of the present invention.

FIG. 15 is a cross-sectional view of essential parts showing a positioning adjustment unit of a carriage position detection mechanism of a magnetic recording / reproducing apparatus of Example 9 of the present invention.

FIG. 16 is a front view showing a carriage position detection mechanism of a magnetic recording / reproducing apparatus according to a tenth embodiment of the present invention.

FIG. 17 is a perspective view showing a head transfer mechanism of a conventional magnetic recording / reproducing apparatus.

FIG. 18 is a top view showing a head transfer mechanism of a conventional magnetic recording / reproducing apparatus.

FIG. 19 is a side view of essential parts showing a head transfer mechanism of a conventional magnetic recording / reproducing apparatus.

FIG. 20 is a schematic diagram showing a positioning error in the head transfer mechanism of the conventional magnetic recording / reproducing apparatus.

FIG. 21 is a sequence diagram showing positioning adjustment of the head transfer mechanism of the conventional magnetic recording / reproducing apparatus.

FIG. 22 is a sequence diagram showing positioning adjustment of the head transfer mechanism of the conventional magnetic recording / reproducing apparatus.

FIG. 23 is a sequence diagram showing positioning adjustment of the head transfer mechanism of the conventional magnetic recording / reproducing apparatus.

FIG. 24 is a perspective view showing a head transfer device of a conventional magnetic recording / reproducing apparatus.

FIG. 25 is a partially enlarged view of a conventional head transfer device.

FIG. 26 is a partially cutaway perspective view showing the internal structure of a conventional stepping motor.

FIG. 27 is a vertical sectional view of a conventional stepping motor.

FIG. 28 is a cross-sectional view of a conventional stepping motor.

FIG. 29 is a diagram for explaining the operating principle of a conventional stepping motor.

FIG. 30 is a perspective view showing a carriage position detection mechanism of a conventional magnetic recording / reproducing apparatus.

FIG. 31 is a front view showing a position detection unit of a carriage position detection mechanism of a conventional magnetic recording / reproducing apparatus.

FIG. 32 is a front view showing a carriage position detecting mechanism of another conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 1 Disk 2 Carriage 2a Needle Support 2b Upper Surface 2c Flag 2d Bearing 2e Bearing 2f Upper Arm Attachment 3 Frame 3a Back 3b Bearing 3c Bottom 4 Guide Rod 5 Needle 6 Needle Pressure Spring 11 Stepping Motor 12 Lead screw 12a Screw groove 13 Motor holder 13a Oblong hole 13b Oblong hole 14 Screw 15 Screw 16 Bearing 21 Lower arm 21a Adjusting hole 21b Adjusting hole 22 Lower head 23 Gimbal spring 24 Screw 25 Screw 26 Presser plate 27 Elastic plate-like elasticity Body 27a Adjustment hole 27b Adjustment hole 31 Upper arm 32 Upper head 33 Screw 34 Screw 41 Optical sensor 41a Optical path portion 42 Slide plate 42a Long hole portion 43 Screw 44 Screw 50 Reference 0 track 51 Reference 40 track 61 Motor holder 6 a Mounting hole 61b Mounting hole 62 Support plate sliding part 63 Leaf spring 64 Arm retracting support plate 71 Rotor core 72 Magnet 73 Upper metal bearing 74 Lower metal bearing 75 Bracket 76 Housing 81 A-phase coil 81a A-phase inner circumferential coil 81b A Phase outer coil 81c A phase outer coil 82 B phase coil 82a B phase inner coil 82b B phase outer coil 82c B phase outer coil 83 A phase bobbin 84 B phase bobbin 85 A phase claw pole 85a A phase pole Upper part 85b A-phase pole lower part 86 B-phase claw pole 86a B-phase pole upper part 86b B-phase pole lower part 101 Carriage 102 Carriage holder 102a Side part 102b Side part 102c Top part 102d Sensor flag part 103 Leaf spring 104 Arm 105a Leaf spring set screw 105 Leaf spring set screw 106 Guide rod 111 Sliding plate 111a Oblong hole 112 Sliding plate set screw 113 Optical sensor 113a Light emitting portion 113b Sensor flag passage portion 113c Optical axis 114 of optical sensor Flexible lead 115 Circuit board 115a Long hole portion 115b Long hole portion 115d V notch portion 115e V notch portion 115f Side surface portion 116a Set screw 116b Set screw 116c Set screw 117 Main body frame 117a Frame rear portion 117b Frame rear portion 117c Bottom portion 117d Female screw portion 117e Screw portion 117f Support portion 118a Guide pin 118b Guide pin 119a Set screw 119b Set screw 120 Rotation support pin 121 Rotation action hole 122 Adjustment screw 122a Countersunk head 122b Screw portion 123 Adjustment screw 123a Tip 123b threaded portion 124 press spring

Claims (11)

[Claims] 1. A recording / reproducing apparatus for recording, reproducing or erasing information on a recording medium disk, wherein an upper and lower arm for holding an upper and lower head facing the front and back surfaces of the disk, and the disk for holding the upper and lower arm. A carriage for moving the carriage in the radial direction, a drive motor for moving the carriage in the radial direction of the disk, a lead screw shaft for engaging the carriage and transmitting a driving force to the carriage, the lead screw shaft and the drive A frame for supporting a motor, the drive motor is mounted and fixed to the frame without positioning adjustment, and the lower arm is translated in the radial direction and the circumferential direction of the disk with respect to the carriage; The lower arm is supported so that it can be adjusted for rotational movement within the disc surface. A head transfer mechanism for a recording / reproducing apparatus, characterized in that it can be fixed to a carriage. 2. A recording medium disc and a recording / reproducing apparatus for recording, reproducing or erasing information on the disc surface, an arm for holding a head facing the disc, and a diameter of the disc for holding the arm. A carriage for moving in the direction, and an optical sensor for detecting the standard position of the carriage with respect to the disk, the optical sensor is mounted and fixed without adjusting the positioning with respect to the frame, and the arm is attached to the carriage with respect to the carriage. Support the disk for translational movement in the radial and circumferential directions, and rotational movement in the disk plane, and after adjustment,
A head transfer mechanism of a recording / reproducing apparatus, wherein the arm is configured to be fixed to the carriage. 3. A recording medium disc and a recording / reproducing apparatus for recording, reproducing or erasing information on the disc surface, and an arm for holding a head facing the disc, and a leaf spring having the arm fixed thereto. A carriage that holds the same through an elastic body and moves in the radial direction of the disk, the elastic body moving translationally in the radial direction and the circumferential direction of the disk with respect to the carriage, and the disk. A head transfer mechanism for a recording / reproducing apparatus, which is supported so as to be capable of adjusting rotational movement in a plane, and is configured to fix the elastic body to the carriage after adjustment. 4. A head-moving stepping motor having a coil for supplying a magnetic field by supplying a current whose polarity is switched, wherein the coil is divided into a plurality of coils, and a part or all of the plurality of coils is selectively selected. A stepping motor for transferring a head, characterized in that the stepping motor is configured to urge the head. 5. A head-moving stepping motor having an A-phase coil and a B-phase coil for supplying a combined magnetic field to which a current whose polarity is individually switched is supplied, each having a plurality of A-phase coils and a plurality of B-phase coils. A stepping motor for head movement, characterized by being divided into coils. 6. A stepping motor for head transfer having an A-phase coil and a B-phase coil for supplying a combined magnetic field to which a current whose polarity is individually switched is supplied, wherein the A-phase coil and the B-phase coil are respectively wound. A stepping motor for head transfer, characterized in that the stepping motor is divided into a plurality of coils having the same value but different DC resistance values. 7. A mechanism for moving a recording / reproducing head with respect to a disk-shaped recording medium so as to advance and retract in the radial direction thereof,
A stepping motor in which the A-phase coil and the B-phase coil for driving the transfer mechanism are divided into a plurality of coils, respectively, and the stepping motor is divided into a plurality of A's.
A head transfer device for a recording / reproducing device, comprising a means for selectively energizing a phase coil and a B phase coil. 8. An optical sensor for detecting the position of a carriage, which holds a head for recording, reproducing, or erasing information on a disk-shaped recording medium and moves it in the radial direction of the recording medium, on the main body frame. Of a recording / reproducing apparatus, which is rotatably supported on a circuit board that is rotatably held in the inside of the board, and that can be fixed to the body frame at an arbitrary rotating position. Carriage position detection device. 9. A rotation action point position for rotating the circuit board is provided at a position farther from a rotation center position of the circuit board than a distance between optical sensors mounted on the circuit board. The carriage position detecting device of the recording / reproducing apparatus according to claim 1. 10. An adjusting screw having a sliding contact area whose diameter changes in a central axis direction of rotation of the circuit board is slidably contacted to the side surface of the circuit board by elastic force, and the adjusting screw is axially moved. The carriage position detecting device of the recording / reproducing apparatus according to claim 1, wherein the circuit board is rotated by moving the circuit board. 11. The side face of the circuit board is brought into contact with the tip end of an adjusting screw engaged with the main body frame in a direction perpendicular to the central axis of rotation of the circuit board by elastic force, and the adjusting screw is axially moved. 2. The carriage position detecting device for a recording / reproducing apparatus according to claim 1, wherein the circuit board is rotated by adjusting the position of the carriage circuit.