JP3189350B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus provided with a cleaning means for removing foreign matter such as dust and dirt attached to a fixed head for recording and reproducing audio signals and synchronization signals on a magnetic tape.

[0002]

2. Description of the Related Art In recent years, magnetic recording / reproducing apparatuses (hereinafter referred to as VTRs)
Is widely used from home use to business use and broadcast use. In particular, a camera- integrated VTR and a portable VTR used in combination with it are convenient to carry, so there are many opportunities to use them outdoors. There has been a growing demand for home-use recordings, such as taking a commemorative photo on a trip without missing a chance.

FIG. 3 is a top view showing a magnetic tape traveling system of a conventional VTR, FIG. 4 (a) is a perspective view of the periphery of a fixed head, and FIG. 4 (b) is an enlarged sectional view of a head gap. . In FIG. 3, a magnetic tape 1 exits from a pair of reels 3 of a cassette 2 and is guided by a plurality of guide pins 4 while a cylinder 5 on which a video head or the like is mounted, and a fixed head 6 for recording and reproducing audio signals and synchronization signals. Then, it travels by being driven by the capstan 8 and the pinch roller 9 via the monitor head 7 for reproducing the recorded signal.
As shown in FIG. 4A, the fixed head 6 has an audio head section 10 for recording and reproducing an audio signal and a control head section 11 for recording and reproducing a synchronization signal. The fixed head 6 and the monitor head 7 are moved or tilted back and forth, up and down and left and right so that the running of the magnetic tape 1 is stabilized during tape running adjustment and the signal output level for recording and reproducing on the magnetic tape 1 is detected by a predetermined amount or more. Or adjust it.

[0004]

SUMMARY OF THE INVENTION Such a conventional VT
In the case of R, especially in the case of outdoor use, powdery substances such as dust and dirt in the air enter the VTR main body through openings and gaps such as the cassette insertion port, and adhere to the magnetic tape surface and the cassette. As a result, as shown in FIG. 3A, the magnetic tape travels into the traveling system, and is transported into the traveling system by the magnetic tape, and adheres and deposits on the magnetic tape traveling system. In particular, foreign substances such as dust and dirt gradually adhere to and accumulate on the front surface of the fixed head, as shown by A in FIG. 4A. Become. In particular, when the control head 11 that magnetically records and reproduces the synchronization signal is clogged and the recording operation is incomplete, it is impossible to reproduce the simultaneously recorded video signal, so that a one-time opportunity such as news coverage for broadcasting can be obtained. This leads to a serious problem of missing video.

Conventionally, when a predetermined signal output level cannot be detected by a monitor head during recording and reproduction on a magnetic tape, an alarm is displayed on the main body of the VTR, and then recording and reproduction on the magnetic tape is interrupted. The VTR was opened and the fixed head was cleaned manually, but it was not possible to take a picture during the cleaning and an important recording opportunity was missed. Therefore, the fixed head was automatically fixed before the fixed head clogged. The problem was to provide a cleaning mechanism for removing foreign matter on the front surface of the head.

However, in the above-mentioned conventional VTR, the position of the fixed head is not fixed because the fixed head is moved forward, backward, up, down, left, and right at the time of tape running adjustment. Therefore, for example, a cleaning mechanism is provided on the main body side of the VTR. In this case, there is a problem that the cleaning of the front surface of the fixed head cannot be performed uniformly.

As shown in FIG. 4 (b), the head gaps of the audio head 10 and the control head 11 have a slight step in the head gap direction. There is also a problem that it cannot be easily removed by cleaning in the direction.

The present invention solves the above-mentioned conventional problems. It is not necessary to manually open the VTR to clean foreign matter such as dust and dirt attached to the fixed head, and the position of the fixed head changes. It is another object of the present invention to provide a magnetic recording / reproducing apparatus having a cleaning means for reliably and uniformly removing foreign matter.

[0009]

In order to achieve this object, the present invention comprises a fixed head and a cleaning member.
The fixed head is adjusted in position with the cleaning member.
It is what is done. The cleaning member is a magnetic tape.
The front of the fixed head until the
It is held in the cover position and the magnetic tape hits the fixed head.
Just before touching, move in the head gap direction of the fixed head
Clean the front of the fixed head while cleaning the magnetic tape
Is held at a position where it does not contact the

[0010]

According to the present invention, when the magnetic tape is not mounted on the tape running system, the cleaning member prevents foreign substances such as dust and dirt from adhering and depositing on the front surface of the fixed head. Sometimes, the cleaning member moves while moving in the head gap direction to perform cleaning, and since the relative positional relationship between the fixed head and the cleaning member is always constant, foreign matters adhering to the front surface of the fixed head are reliably and uniformly removed.

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing a configuration of a peripheral portion of a fixed head according to an embodiment of the present invention, and FIG. 2 is a right side view thereof. 1 and 2, a fixed head 6 and a monitor head 7 are held by a support plate 12 so that the running of the magnetic tape 1 is stabilized and a signal output level for recording and reproducing on the magnetic tape 1 is detected by a predetermined amount or more. It is adjusted by moving or tilting it back and forth, up and down and left and right. Reference numeral 13 denotes a cleaning member which is fixed or detachably attached to the cleaner holder 14. The cleaner holder 14 has a guide groove 15 and a shaft 16 fixed to the support plate 12.
While being guided by a drive gear 18 integrally fitted with a motor 17 through a rack 19, arrows B,
It is configured to be movable in the C direction.

In the above configuration, before the magnetic tape 1 comes into contact with the fixed head 6 and the monitor head 7, the cleaner holder 14 is at the position indicated by the solid line in FIG.
To prevent dust and dirt from accumulating. Immediately before the magnetic tape 1 abuts, a current is supplied to the motor 17 for a predetermined time to rotate the motor 17,
The cleaner 19 is moved through the rack 19 in the direction B in FIG. 2, and the cleaning member 13 held at the tip of the rack 19 slides on the front surface of the fixed head 6 to move dust and dirt. Foreign matter such as is removed. When the magnetic tape 1 comes into contact with the fixed head 6, the cleaning member 13 is at the position indicated by the two-dot chain line in FIG. 2, and there is no contact with the magnetic tape. At this time, the moving direction of the cleaning member 13 coincides with the head gap direction.
The cleaning member 13 also moves in a fixed relationship with the fixed head 6 even if the cleaning head 13 is moved back and forth, up, down, left and right, and the relative positional relationship between the fixed head 6 and the cleaning member 13 is always constant. The conditions for removing the foreign matter adhering to the front surface are always constant, so that the foreign matter can be surely and uniformly removed. When the magnetic tape 1 separates from the running system, the cleaner holder 14 moves in the direction C in FIG. 2 by applying a reversing current to the motor 17 for a predetermined time, and the cleaning member 13 returns to the initial position. I do.

As described above, according to this embodiment, the cleaning member for cleaning the front surface of the fixed head while keeping the relative position to the fixed head for recording and reproducing the audio signal and the synchronization signal on the magnetic tape constant. Before the magnetic tape touches the fixed head, it is placed so as to cover the front surface of the fixed head, and just before the magnetic tape touches the fixed head, the front surface of the fixed head is cleaned while moving in the head gap direction of the fixed head. The fixed head is adjusted by moving the fixed head without manually opening the VTR and cleaning the fixed head.
Also, since the relative positional relationship between the fixed head and the cleaning member is constant, it is possible to obtain a magnetic recording / reproducing apparatus capable of reliably and uniformly removing foreign matters such as dust and dirt attached to the front surface of the fixed head.

Although the operation of the cleaning member is performed using a motor in this embodiment, the cleaning member may be driven using an actuator such as a solenoid.

[0016]

As is apparent from the above embodiments, according to the present invention, the front surface of the fixed head is kept constant while the relative position with respect to the fixed head for recording and reproducing audio signals and synchronization signals on the magnetic tape is kept constant. The cleaning member to be cleaned covers the front of the fixed head until the magnetic tape comes into contact with the fixed head, and is fixed while moving in the head gap direction of the fixed head just before the magnetic tape comes into contact with the fixed head. It has a mechanism that cleans the front of the head and keeps it in a position where it does not come into contact with the magnetic tape, so it usually prevents foreign matter such as dust and dirt from adhering to the front of the fixed head, and attaches the magnetic tape By automatically moving the cleaning member when cleaning, the VTR is opened and the fixed head is cleaned manually. No, move the fixed head in the adjustment
However, since the relative positional relationship between the fixed head and the cleaning member is constant, it is possible to provide a magnetic recording / reproducing apparatus that can reliably and uniformly remove foreign matters such as dust and dirt attached to the front surface of the fixed head. .

[Brief description of the drawings]

FIG. 1 is a front view illustrating a configuration of a peripheral portion of a fixed head according to an embodiment of the present invention.

FIG. 2 is a right side view showing a configuration of a peripheral portion of a fixed head according to an embodiment of the present invention.

FIG. 3 is a top view showing a magnetic tape traveling system of a conventional VTR.

FIG. 4 (a) is a perspective view of a peripheral portion of a conventional fixed head (b)
Enlarged sectional view of a head gap portion of a conventional fixed head

[Explanation of symbols]

 6 Fixed head 12 Support plate 13 Cleaning member 14 Cleaner holder

Claims (2)

(57) [Claims] And 1. A fixed head for recording and reproducing in the longitudinal direction of the magnetic tape, held by the fixed head and a cleaning member for cleaning the front of the fixed head in the head gap direction, the fixed head the Cree
A magnetic recording / reproducing apparatus characterized in that the position is adjusted integrally with a lining member . 2. Recording and reproduction are performed in the longitudinal direction of a magnetic tape.
Fixed head and the cleaner held by the fixed head.
The cleaning member is held at a position covering the front surface of the fixed head until the magnetic tape comes into contact with the fixed head, and the cleaning member is held immediately before the magnetic tape comes into contact with the fixed head. A magnetic recording / reproducing apparatus wherein a front surface of the fixed head is cleaned while being moved in a head gap direction of the fixed head, and is held at a position where the fixed head does not contact the magnetic tape.