JP2001023264A - Cleaning device and magnetic recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning device in which the rotational precision of a capstan motor is improved and the reliability of operations is also improved. SOLUTION: In a magnetic recording/reproducing device such as a VTR, a cleaning means 30, which removes foreign matter by bringing a cleaning member 34 into contact with the FG pattern forming part 52 in the rotor 12 of a capstan motor 50 in link with loading and unloading operations of a magnetic tape, is provided. The foreign matter in the FG pattern forming part 52 of the capstan motor 50 is removed with simple constitution. Also, since cleaning is executed only when the tape is loaded or unloaded, operational noises relating to the cleaning are negligible and recording/reproducing operations are not also influenced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning apparatus and a magnetic recording / reproducing apparatus, and more particularly to a cleaning apparatus and a magnetic recording / reproducing apparatus which improve the rotational accuracy of a capstan motor and improve the operation reliability.

[0002]

2. Description of the Related Art Conventionally, a capstan motor has been used for running a tape in a magnetic recording / reproducing apparatus such as a VTR. As the capstan motor, a flat brushless motor having a driving magnet on a rotor is generally used. The rotor of this motor is formed as a flat cylindrical body having one open side, and is fixed to one end of a rotating shaft rotatably supported by a bearing provided on a substrate. The drive magnet is mounted on the rotor facing the drive coil.

[0003] The capstan motor is provided with a rotation detecting device for detecting the rotation speed of the motor. The detecting device includes an FG (free-generator) magnet provided on the outer periphery of the rotor, An FG sensor is provided to face the FG magnet. FG
The magnet is formed of an annular ring magnet, and is provided so as to surround the outer periphery of the rotor. The FG magnet has N and S poles alternately magnetized. The FG sensor is composed of a magnetically sensitive element such as a magnetoresistive element (MR element) whose resistance value changes in accordance with a change in a magnetic field, and detects the magnetization pattern of the FG magnet and outputs an electric signal. In addition, as a publicly known document related to the present invention, for example, there is JP-A-7-230640.

[0004]

In recent years, with the demand for higher performance and miniaturization of the apparatus, the frequency of the detection signal has been increased in order to perform high-precision rotation control, and the motor has been downsized.
That is, in order to reduce the diameter of the FG magnet, it is necessary to reduce the magnetization pitch of the FG magnet. However,
If the magnetization pitch of the FG magnet is made smaller, the range of the magnetic field becomes narrower and the detection signal becomes smaller. Therefore, it is necessary to bring the FG sensor closer to the FG magnet.

However, when the FG sensor is brought closer to the FG magnet, for example, when a small foreign substance of a magnetic material is adsorbed to the FG magnet, the foreign substance is caught in the gap between the FG magnet and the FG sensor, and abnormal noise is generated. Occurs or F
There is a problem in that the output signal from the G sensor is disturbed, whereby the rotation of the capstan motor becomes unstable or impossible. SUMMARY OF THE INVENTION It is an object of the present invention to provide a cleaning device and a magnetic recording / reproducing device which solve the above-mentioned problems of the prior art, improve the rotation accuracy of the capstan motor, and improve the operation reliability.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a cleaning apparatus and a magnetic recording / reproducing apparatus provided with the cleaning apparatus, wherein a rotor of a capstan motor is rotated in conjunction with at least one of a loading operation and an unloading operation of a magnetic tape. And a cleaning means for removing foreign matter by bringing a cleaning member into contact with the rotation detecting magnetic pattern providing portion.

According to the present invention, it is possible to remove foreign matter from the FG pattern forming portion of the capstan motor with a simple structure. In addition, since the cleaning is performed only when loading or unloading the tape, the operation sound relating to the cleaning can be ignored, and the recording / reproducing operation is not affected at all.

[0008]

Embodiments of the present invention will be described below in detail. FIG. 2 is a plan view showing the configuration of the tape running mechanism of the VTR according to the embodiment of the present invention. The tape transport mechanism of the VTR includes a rotary head 20 equipped with a plurality of magnetic heads, a capstan shaft 10, a pinch roller 11, an audio head 13, a full-width erasing head 21, and a magnetic head 22 drawn out from a cassette. 20, two tape pull-out members 14, 1
5, stopper 1 for two tape pull-out members 14, 15
8, 19 etc.

When a cassette (not shown) is inserted in the power-on state, the two tape pull-out members 14 and 15 move along the guide grooves 16 and 17 engaged respectively, as shown in FIG.
Move from below to above. With this movement, the loading post pins mounted on the tape pull-out members 14 and 15 pull out the magnetic tape 22 from a cassette (not shown) and wind it around the rotary head 20. Also,
When the tape runs, the pinch roller 11 presses the magnetic tape 22 against the capstan shaft 10 by a mechanism (not shown), and the magnetic tape 22 runs as the capstan shaft 10 rotates. The above-described tape running mechanism is well known.

FIG. 3 is a rear view of the main part of the tape running mechanism of the VTR according to the embodiment of the present invention, as viewed from the rear side. A cleaning member 30, which is a cleaning unit according to the present invention, is mounted between the rotor 12 and the tape pull-out member 14 near the rotor 12 of the capstan motor.

One end of the cleaning member 30 is rotatably fixed to the chassis by a shaft 32, and the other end has
Cleaning member 3 that contacts the side surface of rotor 12 and wipes off foreign matter
4 is attached. The cleaning member 30 is urged clockwise by a spring 33 and normally comes into contact with a stopper pin 35 so that the cleaning member 34
Away from the sides.

FIG. 1 shows a first embodiment of the cleaning device of the present invention.
FIG. 3 is a plan view showing the configuration of the embodiment and an end view of a central cross section of the motor 50. First, the flat type brushless motor 50 employed in this embodiment will be described. The flat brushless motor 50 employed as a capstan motor includes a driving coil fixed on a stator (50), and a driving magnet opposed to the driving coil with a small gap. Rotor 1
2 and a rotating shaft (capstan shaft) 10 to which the rotor 12 is attached.

The drive coil is formed as an annular body having a substantially trapezoidal shape by winding a winding, for example. The rotor 12 is formed as a flat cylindrical body with one open. The rotor 12 is made of a magnetic material such as iron, for example, and functions as a yoke for a drive magnet. The drive magnet is fixed to the inner wall surface of the rotor 12 facing the drive coil.

The capstan motor 50 is provided with a rotation detecting device for detecting the rotation speed and rotation direction of the motor. The rotation detecting device includes an FG magnet 52 provided around the rotor 12 and the FG magnet 5.
2 and an FG sensor 51 provided opposite thereto. The FG magnet 52 is formed of an annular ring magnet, and is provided so as to surround the outer periphery of the rotor 12. The FG magnet 52 has N poles and S poles alternately magnetized.

The FG sensor 51 is composed of a magnetically sensitive element such as a magnetoresistive element (MR element) whose resistance value changes in accordance with a change in a magnetic field, and detects the magnetization pattern of the FG magnet 52 to generate an electric signal. Output. FG sensor 51
Are arranged to face the FG magnet 52 at a predetermined distance.

The cleaning member 34 according to the present invention is made of a material for wiping foreign substances such as felt, for example.
0 is attached. As shown in FIG.
Is provided with an arm member 31 constituting the pressing means shown in FIG. The arm member 31 or the entire cleaning member 30 is formed of an elastic member such as plastic, for example. In addition, a protrusion 40 that comes into contact with the arm member is provided on the back surface of the tape pull-out member 14 on the side near the rotor 12 of the capstan motor.

Next, the cleaning operation will be described. When a tape cassette (not shown) is inserted in a power-on state, a tape is arranged between the two tape pull-out members 14 and 15 and the rotary head 20. Next, the link 41 is driven by a loading gear (not shown), and moves upward from below in FIG. 2 along guide grooves 16 and 17 in which the two tape pull-out members 14 and 15 are engaged. With this movement, the loading post pins mounted on the tape pull-out members 14 and 15 pull out the magnetic tape 22 from a cassette (not shown) and wind it around the rotary head 20.

In the above-described loading operation, when the tape pull-out member 14 moves upward from below along the guide groove 16, the protrusion 40 of the tape pull-out member 14 shown in FIG. contact,
The cleaning member 30 is pressed. Therefore, the cleaning member 30 rotates counterclockwise about the shaft 32, and the cleaning member 3
4 contacts the side surface of the rotating rotor 12 and cleans the side surface. Also, at the time of unloading the tape, similarly, the protrusion 40 of the tape pull-out member 14 comes into contact with the arm member 31 of the cleaning member 30 to perform the cleaning operation.

The period during which the cleaning member 34 is in contact with the rotor 12 is only a part of the loading and unloading operations. For example, during loading, it is necessary to control the switching of the reel base. Capstan motor 5
0 is normally rotating. However, since recording and reproduction are not performed during this period, there is no problem even if the rotation of the capstan motor 50 is slightly disturbed by the cleaning operation.

FIG. 4 shows a second embodiment of the cleaning device of the present invention.
It is a top view showing the composition of an example. In the above-described first embodiment, the cleaning member 30 is configured to rotate around the shaft 32. However, in the second embodiment, the entire cleaning member is configured by an elastic member, thereby improving the structure. It is a simplification. In the second embodiment, the difference from the first embodiment is the structure of the cleaning member, and the other configuration is the same as that of the first embodiment.

The cleaning member 60 of the second embodiment is formed of, for example, a thin elastic metal plate, and one end is fixed to the chassis by screws 63. A cleaning member 62 is attached to the other end, and a curved portion 61 is formed at the center. The cleaning member 60 is fixed so that the cleaning member 62 stops at a position slightly away from the side surface of the rotor 12 when the protrusion 40 is not in contact with the curved portion 61. The cleaning member 62 is pressed against the side surface of the rotor 12 by being in contact with the portion 61, and cleaning is performed.

The pressing force and the cleaning period are adjusted by the thickness of the cleaning member 60, the shape of the curved portion 61, and the fixed position. The cleaning operation is the same as in the first embodiment. In the second embodiment, with the above configuration,
The same cleaning operation can be performed with a configuration that is simpler than that of the first embodiment.

[0023]

As described above, in the present invention,
In a cleaning device and a magnetic recording / reproducing device including the cleaning device, a cleaning member is brought into contact with a rotation detecting magnetic pattern applying portion of a rotor of a capstan motor in association with at least one of a loading operation and an unloading operation of a magnetic tape. Since the cleaning means for removing the foreign matter is provided by this, there is an effect that the foreign matter in the FG pattern forming portion of the capstan motor can be removed with a simple configuration. In addition, since cleaning is performed only during loading or unloading of the tape, operation noise related to cleaning can be ignored, there is no fear that the cleaning member is worn, and there is an effect that the recording / reproducing operation is not affected at all.

[Brief description of the drawings]

FIG. 1 is a plan view showing the configuration of a first embodiment of a cleaning device of the present invention, and an end view of a central cross section of a motor 50.

FIG. 2 is a plan view showing a configuration of a tape running mechanism of the VTR.

FIG. 3 is a rear view of a main part of the tape running mechanism of the VTR as viewed from the back side.

FIG. 4 is a plan view showing a configuration of a second embodiment of the cleaning device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Capstan shaft, 11 ... Pinch roller, 12 ... Rotor, 13 ... Audio head, 14, 15 ... Tape pull-out member, 16, 17 ... Guide groove, 18, 19 ... Stopper, 20 ... Rotary head, 21 ... Full width Erase head,
Reference numeral 22: magnetic tape, 30: cleaning member, 31: arm member, 32: shaft, 33: spring, 34: cleaning member, 35:
Stopper pin, 40 ... Projection, 41 ... Link, 50 ...
Capstan motor, 51 FG sensor, 52 FG magnet, 60 cleaning member, 61 curved part, 6
2: Cleaning member, 63: Screw

Claims (3)

[Claims] A cleaning means for removing foreign matter by bringing a cleaning member into contact with a rotation detecting magnetic pattern forming portion of a rotor of a capstan motor in conjunction with at least one of a loading operation and an unloading operation of a magnetic tape. A cleaning device for a magnetic recording / reproducing device, comprising: 2. The cleaning means according to claim 1, wherein said cleaning member is mounted at one end, and said other end of said plate member is rotatably held by said cleaning member. 2. A cleaning device according to claim 1, further comprising pressing means for pressing a cleaning member mounted at one end of the rotor against a rotation detecting magnetic pattern forming portion of a rotor of the capstan motor. 3. A cleaning means for removing foreign matter by bringing a cleaning member into contact with a rotation detecting magnetic pattern forming portion of a rotor of a capstan motor in conjunction with at least one of a loading operation and an unloading operation of a magnetic tape. A magnetic recording and reproducing device comprising: