JPH10320871A - Magnetic recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the magnetic recording/reproducing device having compatibility on the recording/reproducing operation between the other magnetic recording/ reproducing device. SOLUTION: At the time of completing the loading operation, under the state positioned by engagement with the base catcher provided corresponding to the pole base, the information of the reference position obtained corresponding to the normal height position pre-determined with respect to the magnetic recording/reproducing device in order to secure compatibility of recording/reproducing is stored into an external recording device 16 with the guide surface of a guide pole. At the time of completing the loading operation in the case of starting the recording/reproducing operation with the magnetic recording/reproducing device, the height position of the guide surface is automatically set in the normal height position pre-determined with respect to the magnetic recording/reproducing device in order to secure compatibility of recording/reproducing with the automatic height control operation of the closed loop in the height control mechanism composed including reference position sensors 7, 10 and rotary encoders 8, 11 generating the information on the height of the guide pole and the driving source and power transmitting mechanism of control motors 9, 12 provided in the fixing part of the body frame of the magnetic recording/ reproducing device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic recording / reproducing apparatus,
In particular, a magnetic coil wound around a part of the drum peripheral surface by a rotating magnetic head provided so that a rotational trajectory surface is formed at a predetermined position with respect to a fixed portion of the body of the magnetic recording / reproducing apparatus. Recording and playback operations are performed on the tape,
The first and second guide poles which are individually arranged on the running path between the winding start side and the winding end side of the magnetic tape to be wound around a part of the drum circumferential surface described above. The height of the recording trace at a position close to the first guide pole obtained based on the reproduction signal from the magnetic tape and the bending information of the recording trace at a position close to the second guide pole described above. The information on the height of the guide pole is changed so that the closed loop automatic control operation of adjusting the recording trace of the magnetic tape to the rotation locus of the rotary magnetic head is performed by changing the height control signal generated by using the above. A height control mechanism including a reference position sensor and a rotary encoder to be generated and a drive source and a power transmission mechanism provided on a fixed portion of a body of the magnetic recording and reproducing apparatus are provided. A magnetic recording and reproducing apparatus have.

[0002]

2. Description of the Related Art A magnetic tape wound around a part of a peripheral surface of a drum is run at a predetermined running speed, and a specific recording trace pattern (track pattern) corresponding to the rotation locus of a rotary magnetic head is obtained. ) Is formed on a magnetic tape to perform a recording / reproducing operation, and is widely used as a video tape recorder (VTR) or a video cassette recorder (VCR). The above-mentioned track pattern has a specific format for each magnetic recording / reproducing method employed in the magnetic recording / reproducing apparatus, but is formed to operate according to the same magnetic recording / reproducing method. Even if the magnetic recording / reproducing device of the same standard exists, due to the variation due to the existence of the allowable manufacturing error, and other causes,
Generally, the track patterns formed on the magnetic tape corresponding to the rotation locus of the rotary magnetic head for each magnetic recording / reproducing device are different from each other.

[0003] For the above-mentioned reasons, the track pattern formed on the magnetic tape is different for each magnetic recording / reproducing device. Therefore, the recorded magnetic tape recorded by the magnetic recording / reproducing device is used for recording. When recording / reproducing is performed by a magnetic recording / reproducing apparatus other than the magnetic recording / reproducing apparatus (during compatible recording / reproducing operation), good reproducing operation may not be performed. In particular, when a track pattern is formed by recording traces having a narrow recording trace width (track width) for high-density recording, serious trouble may occur during the compatible recording / reproducing operation.

For example, in recent years, by recording three recording traces having a recording trace width of 19 μm on a magnetic tape T simultaneously in parallel, it has become possible to record and reproduce so-called high-vision image information. New form of VTR
(A so-called W-VHS VTR) has been proposed. In the above-described VTR of the new type, two adjacent recording marks among three recording marks formed in parallel on the magnetic tape T at the same time. Are used for recording / reproducing a video signal by two rotating magnetic heads having azimuth angles in opposite directions, and the remaining one recording trace is used for recording an acoustic signal by another rotating magnetic head. Used for reproduction,
The after-recording is also made possible by the rotary magnetic head for recording and reproducing the acoustic signal.

[0005] Incidentally, since the allowable value of the bending in one recording mark in the above-mentioned VTR is set to about 7 μm, for example, when after-recording is performed by the compatible recording / reproducing operation, the recorded magnetic tape is not recorded. A maximum of 1 between the recording trace and the rotation locus of the rotating magnetic head
A shift of about 4 μm may occur. So now,
Considering the case where the displacement of 14 μm occurs between the recording trace of the recorded magnetic tape and the rotation locus of the rotary magnetic head as described above, in the above case, the recording trace of the acoustic signal on the recorded magnetic tape is considered. The rotary magnetic head for recording and reproducing the audio signal to be subjected to the after-recording is shifted from the recording track for recording the audio signal on the recorded magnetic tape by 14 μm toward the recording track for recording the video signal adjacent thereto. In addition, a portion having a width of 14 μm in a recording trace for recording a video signal having a recording trace width of 19 μm is overwritten by an audio signal for after recording, and as a recording portion of an original video signal, Only the portion having a width of 5 μm is left, and the quality of the reproduced video signal is degraded.

In order to solve the above-mentioned problems, it is only necessary to match the rotation trajectory of the rotary magnetic head with the recording trace of the magnetic tape T. Conventionally, in the open loop control circuit or the closed loop control circuit, The rotating magnetic head is tracked to the recording trace of the magnetic head by being driven and displaced by a magnetic head driving device configured using an electro-mechanical conversion element (for example, a voice coil motor, a bimorph of an electrostrictive element) used as an actuator. Let them do it. For example, as disclosed in Japanese Utility Model Publication No. 63-34126 and Japanese Utility Model Application Publication No. Sho 61-158633, the rotating drum on which the rotating magnetic head is mounted and the lower drum are integrally tilted so that the rotating head becomes magnetic. The recording trace of the tape T can be tracked. For example, as disclosed in Japanese Patent Application Laid-Open No. 60-115043, the height of the guide pole is changed by the stacked piezoelectric elements.
For example, as disclosed in Japanese Utility Model Laid-Open Publication No. 61-153151, a gear is fixed to a shaft of a guide pole having a thread portion, and the gear is rotated by a motor to change the height of the guide pole. Various solutions have been proposed.

However, since about two rotary magnetic heads can be mounted on a single magnetic head drive device having a small size, it is used, for example, for recording and reproducing acoustic signals by a so-called deep recording method. In addition, it is difficult to mount an audio head on the magnetic head drive device, and the magnetic head drive device is very expensive. Is difficult to use for consumer VTRs where
Further, the rotating head and the lower drum are integrally tilted as in the above-described solution, and the rotating head is moved by the magnetic tape T.
In the magnetic recording / reproducing apparatus which is capable of tracking the recording marks of the magnetic recording / reproducing apparatus, it is possible to perform the tilt correction satisfactorily, but it is difficult to perform the bending correction. The element is not practical because it can only obtain a displacement of a few microns with a driving voltage of several hundred volts, and it is not practical to provide a motor or a gear on a pole base that is moved at the time of loading operation. There was a problem that it was extremely difficult.

[0008] The applicant's company has proposed a magnetic recording / reproducing apparatus as disclosed in Japanese Patent Application Laid-Open No. 7-57351, ie, a magnetic recording / reproducing apparatus, which does not cause the above-mentioned problems in the conventional apparatus. Recording and recording on a magnetic tape wound around a part of the drum peripheral surface by a rotary magnetic head provided so that a rotational trajectory surface is formed at a predetermined position with respect to a fixed portion of the body of the reproducing apparatus. A reproducing operation is performed, and the magnetic tape to be wound around a part of the drum peripheral surface is separately provided on a traveling path between a winding start side and a winding end side around the drum peripheral surface. A screw provided on the shaft of the guide pole is screwed into a screw hole threaded on the pole base of the loading mechanism to be disposed, and the structure integrated with the lower flange of the guide pole is formed. The height of the guide pole can be changed when a rotational force is transmitted to a gear of the magnetic recording / reproducing apparatus from a driving source provided in a fixed portion of the magnetic recording / reproducing apparatus via a power transmission system using the gear. The first,
The height of the second guide pole is determined based on the reproduction signal from the magnetic tape. The information on the curvature of the recording trace at a position near the first guide pole and the information at the position near the second guide pole are obtained. A reference position sensor and a rotary encoder that generate information on the height of the guide pole and a body of the magnetic recording / reproducing device are configured to be able to be changed by a height control signal generated using the bending information of the recording trace. A closed-loop automatic control system including a drive source and a power transmission mechanism provided in the fixed portion, configured to operate to match the recording trace of the magnetic tape with the rotation locus of the rotating magnetic head. Proposed a magnetic recording / reproducing apparatus having a height control mechanism.

According to the magnetic recording / reproducing apparatus proposed by the present applicant company, even if the recording trace recorded on the recorded magnetic tape to be reproduced is curved, it can be detected based on the reproduced signal. By the automatic control operation of the closed loop performed using the bending information of the generated recording trace,
The recording tracks are rotated by changing the height of the guide poles, which are individually arranged in the running path between the winding start side and the winding end side around the drum peripheral surface, by a closed loop automatic control system. Since the track is matched, the recorded magnetic tape recorded by another magnetic recording / reproducing device can also be favorably reproduced.

[0010]

By the way, in the above-mentioned proposed magnetic recording / reproducing apparatus, when the loading operation is completed, the power transmission by the height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus is performed. If the driven gear in the height control mechanism provided on the loading pole side meshed with the driving gear of the system rotates for some reason while the loading operation is not completed, the guide pole The reference height position may deviate from the normal reference height position. However, at the time of the above-described reproducing operation, even when the reference height position of the guide pole is shifted as described above, the state in which the height of the guide pole is controlled by the automatic control operation of the closed loop described above. Since the reproduction operation is performed in the, no problem occurs in the reproduction operation.

However, the recorded magnetic tape obtained when the recording operation is performed in a state where the reference height position of the guide pole is shifted as described above is a magnetic recording / reproducing apparatus which has performed the recording operation. When the reproducing operation is performed by the magnetic recording / reproducing apparatus, the height of the guide pole is controlled by a closed loop automatic control operation similar to that of the magnetic recording / reproducing apparatus that performed the above-described recording operation. When the reproducing operation is performed, a good reproducing signal can be obtained by the reproducing operation. However, the guide pole by the closed loop automatic control operation in the magnetic recording / reproducing apparatus which has performed the recording operation for producing the recorded magnetic tape described above A magnetic recording / reproducing device that is configured so that it cannot control the height of the Not good reproduction signal can be obtained even by performing. Therefore, the emergence of a magnetic recording / reproducing apparatus free from the above-mentioned problems has been desired.

[0012]

SUMMARY OF THE INVENTION According to the present invention, there is provided a magnetic recording / reproducing apparatus in which a rotating magnetic head is provided such that a rotational trajectory surface is formed at a predetermined position with respect to a fixed portion of a body of a drum. The recording and reproducing operations are performed on the magnetic tape wound on a part of the surface, and the start and end ends of the magnetic tape to be wound on the part of the drum peripheral surface around the drum peripheral surface. The height of the first and second guide poles individually arranged on the traveling path of the recording track at the position close to the first guide pole obtained based on the reproduction signal from the magnetic tape. By changing the bending information and the bending information of the recording trace at a position near the second guide pole by a height control signal generated, the recording trace of the magnetic tape is recorded on the rotation locus of the rotary magnetic head. Close together A reference position sensor and a rotary encoder for generating information about the height of the guide pole, and a drive source and a power transmission mechanism provided on a fixed portion of the body of the magnetic recording and reproducing apparatus so that the automatic control operation of the loop is performed. In a magnetic recording / reproducing apparatus which individually includes a height control mechanism configured for each of the first and second guide poles, a winding start portion and a winding end portion of a magnetic tape on a drum peripheral surface are provided. The space between the guide surfaces of the first and second guide poles in a state in which the reference edge of the magnetic tape in the above can be made to coincide with the reference guide surface for the reference edge of the magnetic tape provided near the drum peripheral surface. When the position is set to the reference height for each of the guide surfaces of the first and second guide poles, after the loading operation is completed, the above-described height control is performed. When a reference position signal is generated from a reference position sensor of a guide pole provided in the mechanism, a count value of a counter that counts pulses generated from a rotary encoder belonging to the height control mechanism is preset to a predetermined value. Means, and a guide surface of each of the first and second guide poles, in a state where the height adjustment is performed so that the guide surfaces individually match the respective reference heights, for each of the guide poles described above. Means for storing a count value of a counter of a provided height control mechanism as information of a reference height for each of the guide surfaces of the first and second guide poles. I do.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific contents of a magnetic recording / reproducing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a block diagram showing a schematic configuration of a magnetic recording / reproducing apparatus of the present invention. FIGS. 2 and 5 show a magnetic recording / reproducing apparatus of the present invention in which a pole base and a magnetic recording / reproducing apparatus are fixed during a loading operation. FIG. 3 is a perspective view of a part of the magnetic recording / reproducing apparatus showing a state of the unit. FIG. 3 is a perspective view of a part of the magnetic recording / reproducing apparatus showing a state in which the magnetic recording / reproducing apparatus shown in FIG. 2 has completed the loading operation and the pole base and the fixed part of the magnetic recording / reproducing apparatus have been joined. In addition,
2, 3, and 5, for simplicity of illustration, illustration of a magnetic tape pulled out from a tape cassette by a loading mechanism and guide rails for guiding a pole base in the loading mechanism are omitted. I have.

In FIG. 1, reference numeral 1 denotes an input terminal of an information signal to be recorded / reproduced in a magnetic recording / reproducing apparatus, and 2 denotes an output terminal. 3 is an upper drum (FIGS. 2 and 3)
And a plurality of rotating magnetic heads (Du in FIG. 5) attached to the rotating magnetic heads (the magnetic rotating heads are indicated by H in FIGS. 2 and 3 and FIG. 5). It is. 4 is a recording / reproducing signal processing unit, 5 is an envelope detection unit, and 6 is a control unit.
Reference numerals 7 and 10 denote reference position sensors, reference numerals 8 and 11 denote rotary encoders, reference numerals 9 and 12 denote control motors (in FIGS. 2, 3 and 5, the control motors 9 and 12 are represented by a drawing symbol Mg. ) And 13 are a drum control unit, 14 is a tape running control unit, 15 is a loading control unit, 16 is an external nonvolatile memory, and 17 is an external control input terminal.

A control input is supplied to the external control input terminal 17 from an operation unit (not shown). In the magnetic recording / reproducing apparatus, the control unit 6 to which the external control input signal supplied to the external control input terminal 17 is provided controls the operation state of each component of the apparatus, thereby providing the external control input signal. , The operation is performed in a predetermined operation mode. The control unit 6 includes, for example, a microprocessor, a read only memory (ROM), a random access memory (RAM), a counter (counter),
A device including an up-down counter or the like can be used.

When the magnetic recording / reproducing apparatus performs a recording operation, the information signal supplied to the input terminal 1 which is to be recorded / reproduced is converted by the recording / reproducing signal processing section 4 into a recording signal suitable for recording. When a magnetic recording / reproducing apparatus performs a reproducing operation by using the rotating magnetic head 3 for recording on a magnetic tape (not shown), a reproduced signal reproduced from the recorded magnetic tape (not shown) by the rotating magnetic head 3 is used. On the other hand, after a predetermined signal processing is performed by the recording / reproducing signal processing unit 4, a reproduction output signal is output from the output terminal 2. When the magnetic recording / reproducing apparatus is performing a reproducing operation, the reproduced frequency modulated wave signal is supplied from the recording / reproducing signal processing section 4 to the envelope detecting section 5 and is output from the envelope detecting section 5. The envelope signal is supplied to the control unit 6.

The envelope signal described above is used as bending information indicating a bending state of a recording mark recorded on a recorded magnetic tape to be reproduced.
As described later, the height of the guide poles individually arranged in the traveling path between the winding start side and the winding end side on the drum peripheral surface,
It is used to make the recording trace coincide with the rotation trajectory of the rotary magnetic head by changing it by the automatic control operation of the closed loop automatic control system.

The control section 6 sends control data to the drum control section 13 to rotate a drum drive motor (indicated by Dm in FIGS. 2, 3 and 5) at a predetermined rotation speed and rotation phase. And the tape control running control unit 14
Drives the magnetic tape at a predetermined running speed and running phase. In addition, the control unit 6 includes a loading control unit
Control the operation of. The reference position sensor 7, the rotary encoder 8, and the control motor 9 are constituent members of a height control mechanism provided to control the height of the guide pole on the drum start side on the winding start side. The reference position sensor 10, the rotary encoder 11, and the control motor 12 are components of a height control mechanism provided for controlling the height of the guide pole on the drum peripheral surface on the winding end side.

Referring now to FIG. 9, a reference position sensor 7 (or 1) that generates information about the height of the guide pole.
0), a rotary encoder 8 (or 11), and a height control including a drive source [control motor 9 (or 12)] and a power transmission mechanism provided on a fixed portion of the body of the magnetic recording / reproducing apparatus. The mechanism will be described.
In FIG. 9C, Du denotes an upper drum, Dd denotes a lower drum, DB denotes a drum base, and PB1 and PB2 denote pole bases provided in a loading mechanism.

The pole base PB1 is provided with a guide pole GP1 and an inclined pole SP1, and the pole base PB2 is provided with a guide pole GP2 and an inclined pole SP2. The guide poles GP1 and GP2 are displaceable in the vertical direction with respect to the pole bases PB1 and PB2 on which the guide poles GP1 and GP2 are provided. When the loading operation by the loading mechanism is completed, the above-described guide pole GP1 is set at a predetermined position on the winding start side on the drum peripheral surface, and the guide pole GP2 is positioned at a predetermined end position on the drum peripheral surface. Installed in

FIG. 9A is a top view near the upper drum in a state where the loading operation by the loading mechanism is completed. Now, as shown in FIG. 9A, the recorded magnetic tape T extends over an angle range slightly over 180 degrees (center angle of the drum) on the peripheral surfaces of the upper and lower drums.
When the tape is wound and the reproducing operation is performed while the tape is wound, the recorded magnetic tape T is in a state where the sequential recording marks recorded on the magnetic tape T have no bend (for example, an alignment tape). ... standard tape for adjustment), and the height position of the guide pole GP1 installed at a predetermined position on the winding start side around the drum peripheral surface;
When the height position of the guide pole GP2 provided at a predetermined position on the drum peripheral surface at the end of winding coincides with the reference height position, reproduction is performed from the rotating magnetic head H. The envelope of the frequency modulated wave signal has a substantially rectangular shape.

However, the height of the guide pole GP1 installed at a predetermined position on the winding start side on the drum peripheral surface, and the guide pole GP installed at a predetermined position on the winding end side on the drum peripheral surface If the height position of the GP2 is deviated from the reference height position, the recorded magnetic tape to be reproduced is sequentially recorded on the magnetic tape as described above. Even if there is no bend in the envelope, the envelope of the frequency-modulated wave signal reproduced from the rotating magnetic head is in a state where the height positions of the guide poles GP1 and GP2 deviate from the normal height positions. , The waveform changes in a wave-like manner as exemplified in FIG. 9B.

When the recording mark formed on the recorded magnetic tape T has a bend as illustrated in FIG. 9C, the recording mark is formed on the drum peripheral surface. The height position of the guide pole GP1 installed at a predetermined position on the winding start side and the height position of the guide pole GP2 installed at a predetermined position on the winding end side around the drum peripheral surface are defined as a reference. When the height position coincides with the set height position, the envelope of the frequency modulated wave signal reproduced from the rotating magnetic head H changes in a wave shape as illustrated in FIG. 9B. Things.

From the above, information on the bending near both ends of the recording trace is obtained in accordance with the change state of the envelope of the frequency modulated signal reproduced from the recorded magnetic tape T to be reproduced. Then, based on this, the height control signal of each guide pole is generated, and the operation of the closed loop automatic control system is performed so that the envelope of the frequency modulated signal reproduced from the rotating magnetic head becomes rectangular over the entire recording trace. It can be seen that by controlling the height of each guide pole, the recording trace of the magnetic tape can be adjusted to the rotation locus of the rotating magnetic head.

In FIGS. 2, 3 and 5 each showing a perspective view of a part of the magnetic recording / reproducing apparatus of the present invention, DB is a drum base. It is fixed to the fixed part of the fuselage. The drum base DB is also a component that functions as a fixing part of the body of the magnetic recording / reproducing apparatus. Dd is a lower drum integrally formed with the drum base DB, and Du is an upper drum. The upper drum Du and the lower drum Dd constitute a drum structure DA. Md is a drum drive motor provided with the rotor fixed to the upper drum Du. In the following description, it is assumed that the upper drum Du is a rotating drum.

In each of the drawings, reference numeral 18 denotes a substrate, and 19 denotes a central axis of the drum structure MA.
Reference numeral 9 is fixed to the center of the lower drum Dd fixed to the drum base DB. The upper drum Du is rotatably mounted on the center shaft 19 of the drum structure MA via a bearing. 20 and 21 are screws for fixing the stator of the drum motor Md to the substrate 18. H is a rotating magnetic head, and G in the figure is a gap between the upper drum Du and the lower drum Dd. The rotating magnetic head H that rotates at a predetermined rotation speed forms a rotation locus plane at a predetermined position with respect to a fixed portion of the body of the magnetic recording / reproducing apparatus. Needless to say, a required number of rotating magnetic heads H are used according to the magnetic recording / reproducing method applied to the magnetic recording / reproducing apparatus.

BC is a base catcher, and this base catcher BC is provided in the aforementioned drum base DB. When the loading operation of the magnetic tape performed by the loading mechanism is completed, the magnetic tape is wound around a predetermined range on the outer peripheral surface of the upper drum Du and the lower drum Dd constituting the drum structure DA. Is done. The loading mechanism pulls out a magnetic tape housed in a tape cassette (not shown) at the time of the loading operation, and, when the loading operation is completed, the magnetic tape wound around a part of the drum peripheral surface. And a first pole base PB provided with a first guide pole GP and a slant pole (slant pole) SP, which are arranged on the traveling path on the winding start side around the drum peripheral surface in the first embodiment. I have.

The loading mechanism cooperates with the first guide pole during the loading operation to pull out the magnetic tape housed in the tape cassette, and in a state where the loading operation is completed, A second guide pole provided on a magnetic tape wound around a part of the drum peripheral surface on a traveling path on the end side of the drum peripheral surface, and a second inclined pole provided with an inclined pole; Pole base PB. The first and second pole bases PB are fixed to, for example, a link constituting a loading mechanism, and are fixed by a guide rail (not shown) from the position of the tape cassette to the position of the drum structure DA. It is configured to be able to move along the moving path of the vehicle.

In the state where the loading operation of the magnetic tape by the loading mechanism (not shown) is completed, the upper drum D constituting the drum structure DA is set.
u and a guide pole G for winding a magnetic tape around a predetermined range on the peripheral surface of the lower drum Dd.
P and the first and second pole bases PB provided with the pair of inclined poles SP are separate base catchers BC whose tip portions are provided corresponding to the respective pole bases PB. Combine with Thereby, the first and second pole bases PB at the time of completion of the loading operation of the magnetic tape by the loading mechanism are predetermined with respect to the fixed portion of the body of the magnetic recording / reproducing apparatus in all of the left-right direction and the up-down direction. It is set in a state where it exists at a spatial position having the specified positional relationship.

As described above, the loading mechanism is provided with the guide pole GP and the inclined pole SP paired with the guide pole GP.
2 and 3, each of FIGS. 2 and 3 and FIG. 5 shows one of the two pole bases, that is, the drum circumference when the loading operation is completed. A pole base on which a second guide pole and an inclined pole are provided, which are disposed on a traveling path on the end side of the drum peripheral surface of the magnetic tape wound on a part of the surface; Only the PB is shown, and the pole base PB provided with the first guide pole and the companion inclined pole is not shown. That is, the pole base PB on which the first guide pole and the paired inclined pole are provided,
In the figure, it is not shown because it exists on the side opposite to the drum structure DA.

In the magnetic recording / reproducing apparatus shown in each of the drawings, a control mechanism for controlling the height of the first guide pole and a control mechanism for controlling the height of the second guide pole are used. The same structure as the mechanism is used. Therefore, in the following description of the present specification, in the state where the loading operation of the magnetic tape by the loading mechanism is completed, the traveling path on the end side of the winding of the drum peripheral surface of the magnetic tape wound around a part of the drum peripheral surface A pole base PB provided with a second guide pole placed at a predetermined position in the inside and a tilt pole paired with the second guide pole, and a mechanism for controlling the height of the second guide pole Is often described simply using terms such as the guide pole GP without distinction between the first guide pole and the second guide pole.

In the magnetic recording and reproducing apparatus shown in FIGS. 2, 3 and 5, GP is a guide pole and SP is a tilt pole. The guide pole GP provided on the pole base PB shown in FIGS. 2 and 3 together with the inclined pole SP has, for example, a configuration as shown in FIG. The top view of the pole base PB shown in FIG.
, The inclination pole SP, and the magnetic tape T, and FIG. 4B shows A in FIG. 4A.
FIG. 4 is a vertical cross-sectional view taken along a line A, and FIG. 4C is a vertical cross-sectional view of a guide pole GP.

Reference numeral 22 denotes a guide pole shaft. The guide pole shaft 22 is inserted into a hole 55 formed in the pole base PB near the lowermost end thereof. The moving direction of the guide pole shaft 22 is guided. A lower flange 23 having a gear 23g formed on a lower outer periphery is fitted and fixed to the shaft 22 of the guide pole. A screw 23a is formed on the outer peripheral surface of the boss of the gear 23g formed on the lower flange 23. The gear 23g is a driven gear that is rotated by meshing with a drive gear of a height control mechanism provided on a fixed portion side of a body of a magnetic recording / reproducing apparatus described later. The screw 23a on the outer peripheral surface of the boss portion of the gear 23g is a female screw 2 provided on the pole base PB.
4 screwed. Since the length of the female screw 24 is set to be longer than the screw 23a on the outer peripheral surface of the boss of the gear 23g, when the shaft 22 of the guide pole rotates, the guide pole GP The shaft 22 is displaced in the center line direction.

The screw to be screwed to the female screw 24 provided on the pole base PB as described above may be provided on the outer peripheral portion of the shaft 22 of the guide pole. An elastic ring 2 is provided between the upper end 25 of the pole base PB and the lower surface of the gear 23g formed below the lower flange 23.
6 (for example, a rubber ring) is press-fitted, and the gear 23g is constantly urged upward. Thereby, the screw 23a on the outer peripheral surface of the boss of the gear 23g formed on the lower flange 23 and the female screw 24 provided on the pole base PB are tightly screwed together without play. Therefore, the gear 23g provided as a driven gear in the height control mechanism on the pole base side meshes with the drive gear of the height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus. Other than the driving rotation, the rotation is not caused by the external force applied as a disturbance.

Reference numeral 27 denotes an upper flange, and the upper flange 27 is arranged such that the lower surface thereof is spaced from the upper surface of the lower flange 23 by a distance equal to the width of the magnetic tape. Is fixed to the shaft 22. Reference numeral 28 denotes a roller provided between the upper and lower flanges 23 and 27. The roller 28 is rotatably inserted into the shaft 22 of the guide pole. On the upper end surface of the protruding portion 27a of the upper flange 27, a semicircular light-shielding plate 29 used as a constituent member of a reference position detector (reference position sensor) PS described later is provided.
The height of the guide pole GP is adjusted so as to have a predetermined mounting phase so that the position detecting operation of the height position of the guide pole GP can be performed well, and the guide pole GP is fixed by the screw 30.
31 is a reference position sensor P which cooperates with the light shielding plate 29 described above.
It is a photo interrupter in S.

In FIGS. 2 and 3 (the same applies to FIG. 5), Mg
Denotes a control motor (control motors indicated by reference numerals 9 and 12 in FIG. 1), and RE denotes a rotary encoder. As the rotary encoder RE, any of various well-known rotary encoders having a function of generating and outputting a pulse having information on the rotation direction of the rotation axis of the control motor Mg and information on the rotation amount may be used. You can select and use ones. The rotary encoder RE shown in each of the above-described drawings is a light-shielding blade plate 3
3 and a photo interrupter 34. A gear 35 is fixed to the shaft 32 of the control motor Mg, in addition to the light-shielding blade plate 33 of the rotary encoder RE, and a gear 36 in a power transmission system is meshed with the gear 35. . Reference numeral 37 denotes a rotation shaft of the gear 36. A gear 37 is fixed to the rotation shaft 38, and the gear 37 is meshed with a gear 39 fixed to the rotation shaft 40.
The gear 39 is a drive gear of a height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus.

The operation of the loading mechanism (not shown) causes the pole base PB to move along the predetermined movement path from the position of the magnetic tape cassette to the position of the drum assembly DA, and the loading operation of the magnetic tape by the loading mechanism is performed. In the completed state, when the tip of the pole base PB is positioned by engagement with the base catcher BC provided corresponding to the pole base PB, the pole base PB is connected to the pole base PB. A gear 23g provided as a driven gear in the height control mechanism is meshed with a drive gear 39 of the height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus.

By the way, when the operation of the loading mechanism is completed as described above, the tip of the pole base PB is positioned by engaging with the base catcher BC provided corresponding to the pole base PB. However, in order for the tip of the pole base PB and the base catcher BC to be completely engaged as described above, the gear 23g on the pole base side and the body of the magnetic recording / reproducing apparatus are required. It is necessary that the drive gear 39 of the height control mechanism provided on the fixed portion side be completely meshed. Therefore, it is a desirable embodiment to use the tooth-shaped driving gear 39 and the driven gear 23a having no flat portion as the tip of the teeth of the driving gear 39 and the driven gear 23g.

FIG. 7 is a diagram for explaining a manner of detecting a reference position by the reference position sensor PS constituted by the light shielding plate 29 and the photo interrupter 31. In the figure, 41 is a light emitting element and 42 is a light receiving element. In the illustrated example, in the optical path from the light emitting element 41 to the light receiving element 42,
The reference position sensor PS is configured to generate a position signal when the light shielding plate 29 enters and exits. However, in implementation, for example, a reflection-type device that generates a position signal by causing a light-receiving element to receive light reflected by a reflector from light emitted from a light-emitting element may be used. Instead of an optical position sensor, for example, a position sensor constituted by a permanent magnet and a magnetic detection element (for example, a Hall element) may be used.

The light shielding plate 29 of the reference position sensor PS is attached to the upper end surface of the projection 27a of the upper flange 27 of the guide pole GP as described above. When the portion 27a is attached to the upper end surface, the guide surface of the guide pole GP (the upper surface of the lower flange 23 of the guide pole or the lower surface of the upper flange 27 of the guide pole) is compatible with the magnetic recording / reproducing apparatus. When the light shielding plate 29 of the reference position sensor PS is in a reference rotation position, that is, in a state where the light shielding plate 29 is at a predetermined regular height position for ensuring the performance,
Deviates from the optical path between the light-emitting element 41 and the light-receiving element 42 that are disposed facing each other in the photointerrupter 31,
The light shielding plate 29 of the reference position sensor PS is projected from the upper flange 27 by a screw 30 so that the light is emitted from the light emitting element 41 to the light receiving element 42 at the moment (see FIG. 7A). You may make it attach to the upper end surface of the part 27a. FIG. 7B is a side view showing a state in which the light shielding plate 29 is most intruded into the photo interrupter 31.

The position (height) of the guide surface of the guide pole GP is detected based on a signal generated by the reference position sensor PS and a count value of pulses output from the rotary encoder RE. That is, the light-shielding plate 29 of the reference position sensor PS deviates from the optical path between the light-emitting element and the light-receiving element arranged opposite to the photointerrupter 31, and the light of the light-emitting element is received by the light-receiving element. The position of the moment when it comes to come
9 as the reference rotation phase.
The height of the guide pole GP when is in the reference rotation phase is defined as the reference position of the guide surface of the guide pole GP, and the amount of displacement (difference in height) in the upward and downward directions from the reference position. Is the cumulative value of the number of pulses output from the rotary encoder RE between the reference position and the current position (for example, the cumulative number of pulses performed by the up / down counter is In addition, the downward displacement of the guide pole is performed by subtraction).

The light shielding plate 29 of the reference position sensor PS described above.
The guide pole GP to which is mounted is provided on the loading pole side meshed with the drive gear 39 of the power transmission system in the height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus as described above. When the driven gear 23g of the height control mechanism is driven and rotated, the driven gear 23g can move upward and downward.
Therefore, even when the driven gear 23g is not meshed with the driving gear 39, the guide pole GP rotates when any rotational force (rotational force that becomes a disturbance) is applied to the guide pole GP, and the guide pole GP rotates. GP up,
It may move downward.

Also, as described above, the height position of the guide surface of the guide pole GP is at the regular height position predetermined for the magnetic recording / reproducing apparatus in order to ensure recording / reproducing compatibility. At this time, the guide pole GP is set so that the light shielding plate 29 of the reference position sensor PS is at the reference rotation position.
When the guide pole GP is rotated by one or more rotations, even if the light shielding plate 29 of the reference position sensor PS is at the reference rotation position, the light shielding plate of the reference position sensor PS in that state is not changed. The reference rotation position 29 does not correspond to the height position of the guide surface of the guide pole GP.

Then, the guide surface of the guide pole GP is
The light shielding plate 29 of the reference position sensor PS is set to a reference rotation position in correspondence with a state where the magnetic recording / reproduction device is at a predetermined regular height position for ensuring recording and reproduction compatibility. After attaching to the guide pole GP,
The guide pole GP is prevented from rotating even when an external force acting as a disturbance is applied to the guide pole GP, or when the guide pole GP is rotated when an external force acting as a disturbance is applied to the guide pole GP, at least one rotation. It is desirable to make it impossible to rotate. Further, it is preferable that the light shielding plate 29 of the reference position sensor PS can be easily attached to the guide pole GP at the reference rotation position.

As described above, after the light shielding plate 29 of the reference position sensor PS is mounted on the guide pole GP so as to be at the reference rotation position with respect to the guide pole GP, an external force acting as a disturbance is applied to the guide pole GP. Even guide pole GP
Is prevented from rotating, for example, as described above with reference to FIG. 4, between the upper end portion 25 of the pole base PB and the lower surface of the gear 23 g formed below the lower flange 23. An elastic ring 26 (for example, a rubber ring 26 or a spring) is press-fitted, and a screw 23a on an outer peripheral surface of a boss portion of a gear 23g formed on the lower flange 23,
Means such that the female screw 24 provided on the pole base PB is tightly screwed with no play is effective.

Further, as described above, the guide pole GP having such a configuration that even when the guide pole GP is rotated when the external force acting as a disturbance is applied to the guide pole GP, the guide pole GP cannot rotate more than one rotation, This can be realized by providing a stopper in the movement path of the light shielding plate 29 in the reference position sensor PS. Further, in order to allow the light shielding plate 29 of the reference position sensor PS to be easily mounted at the reference rotation position with respect to the guide pole GP described above, for example, the light shielding plate in the reference position sensor PS is required. This can be easily realized by providing a long hole in the plate 29, adjusting the light-shielding plate 29 to turn so as to be a reference turning position, and then fixing it with a screw.

In the magnetic recording / reproducing apparatus shown in FIGS. 2 and 3, the loading operation is completed and the tip of the pole base PB engages with the base catcher BC provided corresponding to the pole base PB. The driven gear 23g of the pole base-side height control mechanism is engaged with the drive gear of the height control mechanism provided on the fixed part side of the body of the magnetic recording / reproducing apparatus. When the recording / reproducing operation is performed after the recording, the running path of the magnetic tape on the drum peripheral surface of the magnetic tape wound on a part of the drum peripheral surface is the magnetic tape on the drum start side on the drum peripheral surface. The height of the guide surface of the first guide pole disposed in the travel path of the first guide pole, and the guide surface of the second guide pole disposed in the travel path of the magnetic tape on the end side of the drum peripheral surface It can be varied by varying the height is as previously described.

When the loading operation of the magnetic tape by the loading mechanism is completed, the magnetic tape wound around a part of the drum peripheral surface is placed at a predetermined position in the traveling path on the side of the winding start side of the drum peripheral surface. A first guide pole in a closed state, and a second guide pole arranged in a predetermined position in a traveling path on the end side of the winding of the drum peripheral surface of the magnetic tape wound around a part of the drum peripheral surface. Height of the guide surface (the height of the upper surface of the lower flange 23, the height of the lower surface of the upper flange 27)
Is set to a predetermined regular height for ensuring the compatibility of the recording / reproducing operation with respect to the magnetic recording apparatus. In the state where the magnetic recording / reproducing apparatus is in the reproducing mode, the first The height of the guide surface (the height of the upper surface of the lower flange 23 and the height of the lower surface of the upper flange 27) of the guide pole is closer to the first guide pole obtained based on the reproduction signal from the magnetic tape. The height is changed by a height control mechanism in accordance with a height control signal generated by using the bending information of the recording trace at the position, and the height of the second guide pole (the height of the upper surface of the lower flange 23, the upper flange 27) is reduced. Of the lower surface of the recording tape at a position close to the second guide pole obtained based on the reproduction signal from the magnetic tape. Varied by control mechanism, by performing a control operation to fit the recording track of the magnetic tape to the rotary locus of the rotary magnetic head described above, it is possible to realize good reproduction operation.

That is, the normal recording mark bend appearing in the recording mark of the recorded magnetic tape to be reproduced in the magnetic recording / reproducing apparatus is often U-shaped or S-shaped. Now, taking as an example a recorded magnetic tape showing an S-shaped bend in a recording trace, a traveling path on the start side of winding of the magnetic tape wound around a part of the drum peripheral surface on the drum peripheral surface will be described. The height of the guide surface of the first guide pole (position of the magnetic tape running path) in a state where the first guide pole is disposed at a predetermined position inside, and the drum peripheral surface of the magnetic tape wound around a part of the drum peripheral surface The height of the guide surface of the second guide pole (the position of the magnetic tape running path) in a state where it is arranged at a predetermined position in the running path on the end side of the winding, is opposite to each other, that is, one is high. If the height of the first and second guide poles is changed in a direction opposite to each other, it is possible to correct the height of the first and second guide poles. Drum in magnetic tape as Guides on a first guide pole arranged on the traveling path on the winding start side of the peripheral surface and on a second guide pole arranged on the traveling path on the end side of the magnetic tape on the drum peripheral surface. By controlling the height of the surface by the control mechanism of the height to which the control signal obtained based on the information of the recording trace bending is given,
It is possible to easily obtain a good reproduction signal free from the influence of the curvature of the recording trace.

The state of the envelope of the reproduced frequency modulated wave signal obtained from the magnetic recording / reproducing apparatus 29 in the reproducing mode is as follows.
It undulates corresponding to the S-shaped bend of the recording trace. Therefore, after detecting the reproduced frequency modulated wave signal by the amplitude detector, for example, a signal portion near the head of the envelope signal corresponding to each one recording trace sequentially output from the amplitude detector, Sampling is performed at a time position where a signal portion near the end and an intermediate signal portion can be extracted. The height of the lower flange 23 of the first guide pole arranged in the traveling path on the drum start side on the drum peripheral surface is changed based on the detected signal and the signal extracted from the intermediate signal portion. Control signal of a height having a size and direction for the first guide pole is supplied to the control motor Mg of the height control mechanism of the lower flange 23 of the first guide pole.

Further, based on the signal sampled from the signal portion near the end and the signal extracted from the intermediate signal portion in the envelope signal corresponding to each of the recording traces in sequence, the drum peripheral surface is determined. Flange 23 of the second guide pole arranged in the traveling path at the end of winding
A control signal of a height having a size and a direction for changing the height of the second guide pole is supplied to the control motor Mg of the height control mechanism of the lower flange 23 of the second guide pole. Note that the magnitude of the signal sampled from the intermediate signal portion of the envelope signal corresponding to the reproduction frequency modulated wave signal reproduced from one recording trace is equal to the height of the first and second guide poles. Even if the height is changed, it does not change significantly. The information on the change in height is sequentially 1
The height control can be easily obtained by comparing successive sample values on the time axis at the same position in the reproduction frequency modulated wave signal and the corresponding envelope signal reproduced from the book record. The signal is generated by the control unit 6.

The different heights for changing the height of the lower flange 23 of the first and second guide poles to which the drive signal corresponding to the height control signal generated as described above is supplied. The control motor Mg in the control mechanism according to the above is controlled by the drive signal corresponding to the height control signal having the magnitude and direction individually supplied thereto in the forward (or reverse) direction in accordance with the signal, and the control signal Mg is transmitted in the forward direction (or the reverse direction). Rotate by the amount corresponding to. The rotation force of the control motor Mg
Is transmitted to the driving gear 39 via the gears 35, 36, and 37 fixed to the driven gear 23g, and transmitted to the driven gear 23g meshed with the driving gear 39, and
g rotates in the forward (or reverse) direction. Thereby,
The guide pole GP is displaced in the direction of the center line of the guide pole shaft 22, and therefore, the position of the lower flange 23 fixed to the guide pole shaft 22 is as follows.
It is displaced upward and downward in accordance with the amount of rotation of the driven gear 23g.

Next, the magnetic recording and reproducing apparatus of the present invention illustrated in FIG. 5 will be described. In the magnetic recording / reproducing apparatus shown in FIG. 5, first and second magnetic tapes are provided corresponding to a winding start portion and a winding end portion of the magnetic tape on the peripheral surface of the drum.
The guide pole GP of the magnetic recording / reproducing apparatus is secured within a range of a predetermined upper portion and a lower portion with respect to a regular height position which is predetermined for securing the recording / reproducing compatibility. Each of the pole bases PB is slidably provided so that the height position of the guide surface can be changed in the axial direction. That is, as shown in FIG. 6, for example, the first and second guide poles GP are biased in one direction by a spring while being slidable in the axial direction. Individual pole base P
B. FIG. 5 shows a state in the middle of the loading operation by the loading mechanism, and a magnetic tape is not shown in the figure.

When the loading operation of the magnetic tape by the loading mechanism is completed, the drum structure DA
A guide pole GP in which a magnetic tape is wound around a predetermined range on the peripheral surface of the upper drum Du and the lower drum Dd constituting the guide pole GP;
The first and second pole bases PB provided with the inclined poles SP forming a pair with the first and second pole bases PB are connected to the individual base catchers BC, and the first and second pole bases PB are connected to the first and second pole bases PB.
Each of the second pole bases PB is set to a spatial position having a predetermined positional relationship with respect to a fixed portion of the body of the magnetic recording / reproducing apparatus. The position of the pole base PB is determined by the position shown in FIG.
The position of the pole base PB in the horizontal plane is determined by the coupling of the concave portion indicated by the arrow mark with the portion indicated by the portion 44 of the pole base PB, and the vertical positioning projection provided on the pole base PB. The positioning of the pole base PB in the vertical direction is performed by the engagement of the positioning part 45 (not shown) provided with the base catcher BC.

By the way, the first and second guide poles GP
Are provided on the individual pole bases PB in such a manner that they can be slid in the axial direction and are urged in one direction by a spring. A component of the height control mechanism provided on the fixed part side of the body of the magnetic recording / reproducing apparatus in the height control mechanism used to change the height of the guide pole GP in a state where it is connected to the catcher BC. And the component members of the height control mechanism provided on the pole base side are engaged, the guide pole G
The height of the guide surface of P will be set to the height determined by the height control mechanism at that time.

FIG. 6A is a side view of the pole base PB in the magnetic recording / reproducing apparatus shown in FIG. 5, and FIG. 6B is a view of FIG. An engaging portion 46a formed at the tip of a lower flange 46 shown therein and a boss portion of a gear 47 in a height control mechanism provided on a fixed portion side of the body of the magnetic recording / reproducing apparatus. It is a partial side sectional view which illustrates and illustrates the engaged state with the engaged engaging groove 47b. Reference numeral 5 denotes a shaft of a guide pole GP. The shaft 22 of the guide pole is inserted into a hole whose lower portion is formed in the pole base PB. The sliding can be performed in a state where the moving direction is guided on the wall surface of the hole.

In FIG. 6, reference numeral 27 denotes an upper flange fixed to the shaft 22 of the guide pole.
6 is a lower flange. The lower flange 46 has an engaging portion 46a which can engage with an engaging groove 47b formed in a boss portion of a gear 47 in a height control mechanism provided on a fixed portion side of the body of the magnetic recording / reproducing apparatus. Is formed. Reference numeral 28 denotes a roller having a length equal to the width of the magnetic tape T. A spring 50 is wound around the guide pole shaft 22 between the lower surface of the lower flange 46 and the concave portion 49 provided at the upper end of the pole base PB. Thereby, the upper and lower flanges 27, 4 fixed to the shaft 22 of the guide pole
6 and a roller 28 rotating about the shaft 22 as a center of rotation between the upper and lower flanges 27, 46.
Are urged upward by the spring 50 described above.

At the lower end of the shaft 22 of the guide pole, a hollow portion 5 provided in the pole base PB is provided.
The guide pole GP is in a state in which the washer 52 is in contact with the upper wall of the hollow portion 51 provided in the pole base PB because the washer 52 is fixed with the screw 53 in a state where the washer 52 is protruded into the inside. In, the upper limit position of the displacement is determined. In FIG. 5, the rotating shaft 3 of the control motor Mg
2, a light-shielding vane plate 33 constituting a part of the rotary encoder RE and a gear 35 constituting a part of the power transmission system are fixed. Reference numeral 34 denotes a photo interrupter which forms a part of the rotary encoder RE.

A gear 36 is meshed with the gear 35 fixed to the rotating shaft 32 of the control motor Mg.
Reference numeral 37 denotes a gear provided on the same rotary shaft 38 as the gear 36 described above. The gear 37 is meshed with a gear 47. An engaging groove 47b is formed in the boss of the gear 47. A light-shielding plate 29, which constitutes a part of the reference position sensor PS, is mounted on a rotation shaft 48 of the gear 47 by a screw 30. Reference numeral 31 denotes a photo interrupter that constitutes the reference position sensor PS together with the light shielding plate 29 described above.
A screw 48g is screwed on an outer peripheral surface of a portion below the rotary shaft 48 of the gear 47, and the screw 48g is screwed to a female screw 54g screwed to the protrusion 54 of the drum base DB. ing.

When the magnetic recording / reproducing apparatus changes from a state in the middle of the loading operation illustrated in FIG. 5 to a state in which the loading operation is completed (not shown), the leading end of the pole base PB as described above. However, in combination with the base catcher BC, the pole base PB is set to a spatial position having a predetermined positional relationship with respect to the fixed portion of the body of the magnetic recording / reproducing apparatus. When the magnetic recording / reproducing device has completed the loading operation, a member formed at the tip of a lower flange 46 used as a member functioning as a part of a component provided on the pole base side of the height control mechanism. The joining portion 46a and the engagement groove 47b formed in the boss portion of the gear 47 used as a member provided on the fixed portion side of the height control mechanism and serving as a component member are engaged.

The engaging portion 46a formed at the tip of the lower flange 46 has a V-shaped cross section, and engages with the engaging portion 46a formed at the tip of the lower flange 46. The engaging groove 47b has a V-shaped cross-sectional shape that matches the V-shaped cross-sectional shape of the engaging portion 46a. Therefore, immediately before the magnetic recording / reproducing apparatus completes the loading operation, the lower flange 4
6 from the state in which the engaging portion 46a formed at the tip of the gear 6 starts engaging with the engaging groove 47b formed in the boss portion of the gear 47, until the loading operation is completed. The engaging operation is performed well.

The magnetic recording / reproducing apparatus of the present invention shown in FIG.
After the loading operation by the loading mechanism is completed, the recording / reproducing operation is started and a height control signal is supplied from the control unit 6 to rotate the control motor Mg. Via the gear 47
Rotates. When the gear 47 rotates, the screw 48g screwed below the rotation shaft 48 of the gear 47 rotates in a state of being screwed into the female screw 54g screwed to the protrusion 54 of the drum base DB. Meanwhile, the rotation shaft 48 of the gear 47 moves upward or downward according to the rotation direction.

When the rotation shaft 48 of the gear 47 rotates, the light shielding plate 29 of the reference position sensor PS mounted on the rotation shaft 48 rotates, and the position signal from the photointerrupter 24 of the reference position sensor PS is turned. Is output. When the rotation shaft 48 moves upward and downward with the rotation of the rotation shaft 48 of the gear 47, the lower flange engaged with the engagement groove 47b formed in the boss portion of the gear 47. The engaging portion 46a formed at the tip of the 46 also moves upward and downward with the above-described upward and downward movement of the rotating shaft 48. Therefore, the guide pole GP moves upward and downward by the rotation of the control motor Mg.

In the magnetic recording / reproducing apparatus shown in FIG.
When the loading operation by the loading mechanism is completed,
For each of the guide poles arranged on the winding start side of the drum peripheral surface and the guide poles arranged on the winding end side of the drum peripheral surface, the height of their guide surfaces is determined by:
In order to ensure the compatibility of the recording / reproducing operation of the magnetic recording device, the height is set to a predetermined regular height. When the magnetic recording / reproducing device is in the reproducing mode, the first guide is used. The height of the guide surface of the pole,
The first method described above obtained based on a reproduction signal from a magnetic tape.
The height of the guide surface of the second guide pole is changed by a height control mechanism using a height control signal generated using the bending information of the recording trace at a position close to the guide pole. The rotation is changed by a height control mechanism by a height control signal generated by using the bending information of the recording trace at a position close to the second guide pole obtained based on the reproduction signal from the tape. By performing a control operation such that the recording trace of the magnetic tape matches the rotation locus of the magnetic head, a good reproducing operation is realized as in the case of the magnetic recording / reproducing apparatus described above with reference to FIGS. can do.

Next, FIG. 2, FIG. 3, and FIG.
The following describes how the standard height of the guide pole GP at the time of manufacturing the magnetic recording / reproducing apparatus shown in (1) (regular height predetermined for ensuring compatibility of the recording / reproducing operation) is set. This will be described with reference to FIGS. FIGS. 8A and 8B are flowcharts illustrating two different setting modes that can be used when setting the standard height of the guide pole GP at the time of shipment from the factory. 4B is a flowchart illustrating a manner in which the magnetic recording / reproducing apparatus sets the standard height of the guide pole GP when recording / reproducing an information signal to be recorded / reproduced.

First, the guide pole G at the time of shipment from the factory
In the setting mode of the standard height of P, the setting mode of the standard height of the guide pole GP at the time of factory shipment shown in the flowchart of FIG. 8A in the setting mode of the driving motor Mg as in step (a1). When driven, the guide pole GP is displaced upward and downward, and the height of the guide surface (upper surface of the lower flange, lower surface of the upper flange) of the guide pole GP is set to a predetermined height (magnetic recording) by a measuring instrument. Adjusted to a state where the height becomes a predetermined regular height in order to ensure the compatibility of the recording and reproducing operations between the reproducing devices)
The count value of the counter (counter) in the above state is stored in the external nonvolatile memory 16 (see FIG. 1) as in step (a2).

The setting mode of the standard height of the guide pole GP at the time of factory shipment shown in the flowchart of FIG. 8B is obtained by reproducing the standard tape as in the step (b1). The drive motor Mg is driven so that the envelope of the reproduction frequency modulated wave signal becomes flat, and the guide pole GP is displaced upward and downward, and the guide surface of the guide pole GP (the upper surface of the lower flange, the lower surface of the upper flange) , The roller surface) is adjusted to a predetermined height (a regular height that is predetermined in order to ensure compatibility of the recording / reproducing operation between the magnetic recording / reproducing devices). The count value of the counter (counter) in the above state is stored in the external nonvolatile memory 16 (see FIG. 1) as in step (b2).

Here, the manner of setting the standard height of the guide pole GP at the time of shipment from the factory shown in the flowchart of FIG. 8B will be specifically described as follows. First, a standard tape (recorded magnetic tape with no bent recording traces) is mounted on the magnetic recording / reproducing apparatus, and the height of the guide pole GP on the winding start side of the magnetic tape around the drum peripheral surface is increased. The control motor Mg (9 in FIG. 1) of the control mechanism is operated until the reference position sensor PS (7 in FIG. 1) outputs a reference position signal corresponding to the reference rotation position of the light shielding plate 29 until the reference position signal is output. Invert or reverse. Then, the control unit 6 first receives a reference position sensor PS (7 in FIG. 1) in the height control mechanism of the guide pole GP on the winding start side of the magnetic tape around the drum peripheral surface.
By the time the reference position signal corresponding to the reference rotation position of the light shielding plate 29 is output, the rotary encoder RE (FIG.
The counter (not shown) provided in the control unit 6 that has counted the number of pulses output from 8) is set in advance when the reference position signal is output. Preset to a predetermined numerical value (for example, zero).

Next, the control motor Mg (12 in FIG. 1) in the height control mechanism of the guide pole GP at the end of winding the standard tape around the drum peripheral surface, which is mounted on the magnetic recording / reproducing apparatus, is The light is rotated forward or backward until the reference position sensor PS (10 in FIG. 1) outputs a reference position signal corresponding to the reference rotation position of the light shielding plate 29. Next, in the control unit 6, the reference position sensor PS in the height control mechanism of the guide pole GP on the end side of the winding of the magnetic tape around the drum peripheral surface is controlled.
The number of pulses output from the rotary encoder RE (11 in FIG. 1) from (10 in FIG. 1) to the time when the reference position signal corresponding to the reference rotation position of the light shielding plate 29 is output. A counter (not shown) provided in the control unit 6 that has been counting is preset to a predetermined numerical value (for example, zero) when the reference position signal is output. Next, the reproduction operation is performed by running the standard tape, and after the running state is stabilized, the reproduced frequency modulated wave signal is detected by the envelope detection unit 5 and supplied to the control unit 6. The envelope detector 5 detects a signal portion close to the head, a signal portion close to the end, and a signal position close to the end of the detected envelope signal corresponding to each one recorded trace sequentially. After sampling is performed, the above-described sample value is converted into an analog-to-digital value and supplied to the control unit 6.

In the control section 6, first, the control motor Mg (9 in FIG. 1) in the height control mechanism of the guide pole GP on the winding start side of the magnetic tape around the drum peripheral surface causes the magnetic tape to move to the drum peripheral surface. The envelope signal is detected while changing the height of the guide pole GP on the winding start side over its variable range, and changes with the change in the height of the guide pole GP (change in the count value of the counter). The magnitude (envelope value) of the envelope signal is calculated, and it is sequentially written into a memory (not shown) in the control unit 6. Then, the control unit 6 reads each of the envelope values obtained over the variable range of the height from the memory and compares them, and the counter when the envelope value indicating the state of the highest flatness is obtained is obtained. Is written into the external nonvolatile memory 16.

Next, the control unit 6 controls the height of the guide pole GP on the ending side of the magnetic tape around the drum peripheral surface by the control motor Mg (12 in FIG. 1) in the height control mechanism. The envelope signal is detected while changing the height of the guide pole GP on the winding start side over the variable range thereof, and the envelope changes with the change in the height of the guide pole GP (count value of the counter). The magnitude (envelope value) of the signal is calculated, and it is sequentially written into the memory (not shown) in the control unit 6. Then, the control unit 6 reads each of the envelope values obtained over the variable range of the height from the memory and compares them, and the counter when the envelope value indicating the state of the highest flatness is obtained is obtained. Is written into the external nonvolatile memory 16.

As described above, the data of the reference height of the guide pole on the winding start side of the magnetic tape around the drum peripheral surface,
Each counter value individually written in the external nonvolatile memory as the data of the reference height of the guide pole GP on the winding end side is stored in each guide pole GP in the magnetic recording / reproducing apparatus.
(A regular height predetermined for ensuring compatibility of recording and reproducing operations). Therefore, during the recording operation of the magnetic recording / reproducing apparatus, if the height position of each guide pole GP is set corresponding to the counter value written in the external nonvolatile memory, the height position of each guide pole GP is set. Is set to a predetermined regular height in order to ensure compatibility of the recording / reproducing operation.

Next, FIG. 8C shows the case where the recording operation is performed in the magnetic recording / reproducing apparatus and the case where the recorded magnetic tape on which the information signal is recorded is reproduced in another magnetic recording / reproducing apparatus. It will be described with reference to FIG. When performing a recording operation and a reproducing operation in the magnetic recording / reproducing apparatus, first, the operations of steps (c1) and (c2) in the flowchart illustrated in FIG. After the operation of setting the height to the standard height (regular height predetermined for ensuring compatibility of the recording / reproducing operation) is performed, the process proceeds to step (c3). In step (c3), it is determined whether or not a reproducing operation is performed. If the magnetic recording / reproducing apparatus is performing a recording operation, the process proceeds from step (c3) to the end. If the magnetic recording / reproducing apparatus is performing a reproducing operation, the process proceeds from step (c3) to step (c4).

Next, the operation for reproducing a recorded magnetic tape will be described in detail with reference to a flowchart illustrated in FIG. 8C. When the recorded magnetic tape is reproduced by the magnetic recording / reproducing apparatus, the recorded magnetic tape is loaded on the magnetic recording / reproducing apparatus in step (c1). Next, in step (c2), the control unit 6 determines the count value of the counter (counter) for counting the pulses generated from the rotary encoder RE (8 in FIG. 1) at the start of winding the magnetic tape around the drum peripheral surface. The external non-volatile memory 16
The control motor Mg (the control motor 9 in FIG. 1) in the height control mechanism of the guide pole GP on the winding start side of the magnetic tape around the drum is set so that the count value coincides with the count value stored in the magnetic tape. Control to rotate forward or reverse. When the count value of the above-mentioned counter matches the count value stored in the external non-volatile memory 16 for the guide pole GP on the winding start side of the magnetic tape around the drum peripheral surface, the control motor Mg (FIG. 9) is stopped.

Then, in the control section 6, the count value of the counter (counter) for counting the pulses generated from the rotary encoder RE (11 in FIG. 1) is determined on the side of the end of the winding of the magnetic tape around the drum peripheral surface. The control motor in the height control mechanism of the guide pole GP at the end side of the winding of the magnetic tape around the drum peripheral surface so that the guide pole GP coincides with the count value stored in the external nonvolatile memory 16. Control is performed so that Mg (control motor 12 in FIG. 1) rotates forward or reverse. When the count value of the above-mentioned counter matches the count value stored in the external nonvolatile memory 16 for the guide pole GP at the end side of the winding of the magnetic tape around the drum peripheral surface, the control motor Mg (FIG. 12)
To stop.

By the operation in step (c2), the spatial position of the guide surface of the guide pole GP at the start of winding the magnetic tape around the drum surface and the guide pole at the end of winding the magnetic tape around the drum circumferential surface The spatial position of the guide surface of the GP means each guide pole G in the magnetic recording / reproducing apparatus.
A state corresponding to the standard height of P (regular height that is predetermined for ensuring compatibility of the recording / reproducing operation) is set. Therefore, in the state where the above-mentioned step (c2) is completed, the height position of each of the above-mentioned guide poles GP is
The recording height is set to a predetermined regular height in order to ensure the compatibility of the recording / reproducing operation. If the recording operation is performed in this state, the recording can be performed well by another magnetic recording / reproducing apparatus. A finished magnetic tape is obtained.

In step (c3), a reproducing operation is performed on a recorded magnetic tape which is loaded to be reproduced. In step (c4), for the reproduced frequency modulated wave signal reproduced from the recorded magnetic tape, the envelope signal output from the envelope detection unit 5, that is, each of the recording traces sequentially recorded by the envelope detection unit 5, The corresponding envelope signal is sampled at a time position where a signal portion near the head, a signal portion near the end, and an intermediate signal portion can be extracted, and an envelope signal (A / D converted from the sample value) is obtained. The control unit 6 to which the data of the bending information is given includes a control motor Mg (9 in FIG. 1) in the height control mechanism of the guide pole GP on the start side of winding the magnetic tape on the drum peripheral surface, The control motor Mg (12 in FIG. 1) in the height control mechanism of the guide pole GP at the winding end side on the drum peripheral surface is moved forward and backward, respectively. It is rotated in.

The height control mechanism of the guide pole GP on the winding start side of the magnetic tape around the drum peripheral surface and the height control mechanism of the guide pole GP on the winding end side of the magnetic tape around the drum peripheral surface have already been described. As described above, since the automatic height control systems are respectively configured, the height of the guide pole GP at the beginning of winding the magnetic tape around the drum peripheral surface and the height of the guide pole GP at the end of winding the magnetic tape around the drum peripheral surface are described. The height of the guide pole GP means that the guide pole GP is displaced upward and downward so as to be able to correct the curvature of the recording mark recorded on the recorded magnetic tape, and is recorded on the recorded magnetic tape. Even if the recording trace has a bend, a good reproduction signal can be obtained as in the case of reproducing a recorded magnetic tape in a state where the recording trace has no bend.

In the magnetic recording / reproducing apparatus of the present invention, the spatial position of the guide surface of the guide pole GP at the start of winding the magnetic tape around the drum surface and the guide pole GP at the end of winding the magnetic tape around the drum circumferential surface. And the spatial position of the guide surface corresponds to the standard height of each guide pole GP in the magnetic recording / reproducing apparatus (regular height predetermined for ensuring compatibility of the recording / reproducing operation). In FIG. 1, the edge of the light shielding plate 29 of the reference position sensor PS (7, 11 in FIG. 1) is connected to the light emitting elements 41, 4 of the photo interrupter 31.
The optical path between the two has a specific rotational phase relationship as described above with reference to FIG. 7, and the magnetic recording / reproducing apparatus of the present invention is described with reference to FIGS. As in the configuration example described above, the light-shielding plate 29 of the reference position sensor PS (7, 11 in FIG. 1) is provided on the pole base PB that is in a moving state during the loading operation, and the reference position sensor PS. When the photointerrupter 31 (7, 11 in FIG. 1) is provided on the fixed portion side of the body, the reference position sensor PS (see FIG. 1) provided on the pole base PB which is in a moving state during the loading operation. 7,1 in 1
The rotation phase of the light shielding plate 29 in 1) may deviate from the normal rotation phase state due to vibration, impact, or the like during movement.

As a solution to the above problem, as described above, the shaft 22 of the guide pole may be made to have a mechanical structure that makes it difficult to rotate even by disturbance. When loading the magnetic tape, the control unit 6 moves the guide pole GP up and down within a predetermined range when the loading operation is completed.
Performs a control operation such that the control motor Mg (the control motors 9 and 12 in FIG. 1) rotates forward and backward, and when the loading operation is completed, the reference position of the guide surface of the guide pole and the count value of the counter are calculated. May always be made correct.

In the magnetic recording / reproducing apparatus shown in FIGS. 2, 3 and 5, the height control mechanism of the guide pole GP at the start of winding the magnetic tape on the drum peripheral surface, and the winding of the magnetic tape on the drum peripheral surface. Reference position sensors P individually provided for the height control mechanism of the guide pole GP on the end side.
In S (7, 10 in FIG. 1), each light shielding plate 29 generates a reference position signal at a reference rotation position, and supplies it to the control unit 6. Also, the rotary encoder RE
(8, 11 in FIG. 1) generates a pulse having information on the rotation direction and the amount of rotation of the rotation shaft 32 of the control motor Mg (9, 12 in FIG. 1), and sends the pulse to the control unit 6. Supply.

Further, the envelope detector 5 to which the reproduced frequency modulated signal reproduced from the recorded magnetic tape is supplied generates an envelope signal corresponding to the envelope of the reproduced frequency modulated signal, and outputs the envelope signal to the controller 6. To supply. The control unit 6 controls the height control mechanism of the guide pole GP on the winding start side of the magnetic tape around the drum peripheral surface and the height control mechanism of the guide pole GP on the ending end side of the magnetic tape winding around the drum peripheral surface. A height control signal is generated for each of the predetermined guide poles, and a height control mechanism configured as a closed-loop automatic height control system, that is, a reference position sensor PS and a rotary encoder R
E, control motor Mg, gear 23g, 35-37, 39
(In the case of FIGS. 2 and 3) [or the gears 35 to 37, 47
(In the case of FIG. 5)], drives the control motor Mg (9, 12 in FIG. 1) in the height control mechanism configured as a closed loop automatic height control system including the guide pole GP and the control unit 6. Let it.

The reference height position of the guide surface of the guide pole GP is determined by the pulse generated from the rotary encoder RE belonging to the height control mechanism when the reference position signal is output from the reference position sensor PS. After the count value of the counting counter (up-down counter) is preset to a predetermined numerical value, the above-described guide in a state where the height of the guide surface of the guide pole GP is adjusted to be the reference height. The count value of the counter that counts the number of pulses generated from the rotary encoder RE of the height control mechanism to which the pole belongs (the external nonvolatile memory 16
, The amount of change in the height (rotation amount) of the guide pole GP from the reference height position of the guide surface is indicated by the rotary encoder RE. And the count value of the counter at the reference height position of the guide surface of the guide pole GP (for each guide surface stored in the external nonvolatile memory 16). (Information on the reference height).

Therefore, in the magnetic recording / reproducing apparatus exemplified in FIGS. 2, 3 and 5, etc., the height of the guide surface of the first and second guide poles GP is determined by using the count value of the counter. The height can be set to the reference height with high accuracy by the automatic height control operation of the height control mechanism described above, or can be changed with high accuracy according to the detected envelope value.

[0085]

As is apparent from the above description, in the magnetic recording / reproducing apparatus of the present invention, the guide surface of the guide pole is set in advance with respect to the magnetic recording / reproducing apparatus in order to secure recording / reproducing compatibility. The information of the reference position obtained corresponding to the determined regular height position is stored in an external storage device, and when the loading operation is completed when the magnetic recording and reproducing device starts the recording and reproducing operation, the guide pole is Height control mechanism including a position sensor and a rotary encoder for generating information about the height of the vehicle, and a drive source and a power transmission mechanism provided on a fixed portion of the body of the magnetic recording and reproducing apparatus By the operation, the height position of the guide surface is automatically set at a predetermined regular height position for the magnetic recording / reproducing apparatus in order to secure recording / reproducing compatibility. According to the present invention, it is possible to easily provide a magnetic recording / reproducing apparatus in which recording / reproducing compatibility is secured. First and second individually arranged in the traveling path between the winding start side and the winding end side on the peripheral surface
The height of the guide pole is obtained based on the reproduction signal from the magnetic tape, and the information on the curvature of the recording trace at the position near the first guide pole and the recording trace at the position near the second guide pole are described. It is of course possible to perform a closed loop automatic control operation for adjusting the recording trace of the magnetic tape to the rotation trajectory of the rotating magnetic head by changing the height according to the height control signal generated using the bending information. The adjustment of the height of the guide pole at the time of shipment from the factory can be automatically performed only by reproducing the standard tape, and the conventional problems described above can be solved well by the present invention.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is a perspective view of a part of the magnetic recording / reproducing apparatus of one embodiment of the present invention during a loading operation.

FIG. 3 shows a state where a loading operation is completed.
1 is a perspective view of a part of the magnetic recording and reproducing apparatus of the present invention shown in FIG.

FIG. 4 is a diagram for explaining a guide pole provided on a pole base.

FIG. 5 is a perspective view of a part of another magnetic recording / reproducing apparatus of the present invention during a loading operation.

FIG. 6 is a diagram illustrating a guide pole provided on a pole base.

FIG. 7 is a diagram for explaining the operation of the position sensor.

FIG. 8 is a flowchart for explaining the operation.

FIG. 9 is a diagram for explaining a problem of the magnetic recording / reproducing apparatus.

[Explanation of symbols]

DB: drum base, Dd: lower drum, Du: upper drum, H, 3: rotary magnetic head, BC: base catcher, DA: drum assembly, PB: pole base, Md: drum drive motor, Mg, 9, 12, ... Control motor, GP ...
Guide pole, SP: Inclined pole, T: Magnetic tape, R
E, 8, 11 ... Rotary encoder, PS, 7, 10
... Reference position sensor, 4 ... Recording / reproducing signal processing unit, 5 ... Envelope detecting unit, 6 ... Control unit, 13 ... Drum control unit, 1
4 ... Tape running control unit, 15 ... Loading control unit, 1
6 ... external nonvolatile memory, 17 ... external control input, 22 ...
Guide pole shaft, 23, 46, ... lower flange,
23g: driven gear, 35 to 37, 47: gear, 26: elastic body, 27: upper flange, 28: roller, 29: light shielding plate, 32: rotating shaft of control motor Mg, 33: part of rotary encoder RE Constituting light-shielding blades, 3
1, 34: photo interrupter, 39: drive gear, 50
... Spring, 47b ... engagement groove of gear 47, 54 ... protrusion of drum base,

Claims (4)

[Claims] 1. A magnetic recording / reproducing apparatus, which is wound around a part of a drum peripheral surface by a rotary magnetic head provided so that a rotational trajectory surface is formed at a predetermined position with respect to a fixed portion of a body of a magnetic recording / reproducing apparatus. The recording and reproducing operations for the magnetic tape are performed, and the magnetic tape to be wound around a part of the drum peripheral surface is individually moved along the running path between the winding start side and the winding end side around the drum peripheral surface. The height of the disposed first and second guide poles is determined by the information on the curvature of the recording trace at a position close to the first guide pole obtained based on the reproduction signal from the magnetic tape and the second A closed loop automatic control operation for adjusting the recording trace of the magnetic tape to the rotation locus of the rotating magnetic head by changing the height control signal generated by using the bending information of the recording trace at a position near the guide pole of the rotating magnetic head. Do As can be seen, a reference position sensor and a rotary encoder that generate information regarding the height of the guide pole, and a height configured to include a drive source and a power transmission mechanism provided at a fixed portion of the body of the magnetic recording and reproducing apparatus. In a magnetic recording / reproducing apparatus which is provided with a control mechanism individually for each of the first and second guide poles,
In a state in which the reference edge of the magnetic tape at the start and end portions of the magnetic tape on the drum peripheral surface can coincide with the reference guide surface for the reference edge of the magnetic tape provided near the drum peripheral surface. Assuming that the respective spatial positions of the guide surfaces of the first and second guide poles are the reference heights of the respective guide surfaces of the first and second guide poles, the above-described operation is performed after the loading operation is completed. When a reference position signal is generated from a reference position sensor of a guide pole provided in the height control mechanism, a count value of a counter that counts pulses generated from a rotary encoder belonging to the height control mechanism is a predetermined numerical value. And a guide surface of the first and second guide poles so that the guide surfaces individually match the respective reference position heights. In the adjustment has been performed state,
Means for storing a count value of a counter of a height control mechanism provided for each of the guide poles as information of a reference height for each of the guide surfaces of the first and second guide poles. Magnetic recording and reproducing device. 2. A counter preset value stored as information of a reference height for each guide surface of first and second guide poles, based on a count value of pulses generated from a rotary encoder in a height control mechanism. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the recording operation is performed in a state where the values are matched. 3. The magnetic recording / reproducing apparatus according to claim 1, wherein the height of the guide surface of each of the first and second guide poles is measured by a measuring device to adjust the standard height. 4. A reference height so that an envelope of a reproduction signal obtained by reproducing a recorded magnetic tape having a recording mark recorded on a magnetic tape without a bend as a standard tape is in a flat state. 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the adjustment is performed.