JPH01269220A - Head cleaning cassette - Google Patents

Abstract

PURPOSE:To suppress the bad influence of friction, etc., to a magnetic head by giving magnetism to the magnetic tape of a cleaning cassette, which has a cleaning tape to execute the cleaning of the magnetic head, and recording the speed control signal of a reproducing mode, which is farthest to a device, and providing an error erasing means in the cassette. CONSTITUTION:The magnetism is given to the tape in the head cleaning cassette of a video tape recorder VTR and the speed control signal of an SP mode is recorded in advance. Then, the error erasing means is provided in this cassette. The prescribed length of this tape is wound to a pair of reels in the cassette and received and the cassette is charged to the VTR. Then, when the cleaning of the tape is executed, a condition that the error erasing means can be operated is obtained and using in a recording mode is prohibited. Then, the speed control signal of the SP mode, which is recorded when the device is used in the reproducing mode, is detected and the tape is automatically traveled at a highest traveling speed. Then, the cleaning of the magnetic head is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a head cleaning cassette for cleaning a magnetic head provided in a device such as a video device.

(Prior Art) For example, a magnetic head provided in a video tape recorder (hereinafter referred to as a VTR) is clogged with magnetic particles from the magnetic tape attached to it due to repeated recording and reproduction over a long period of time. As a result, normal recording and reproduction cannot be performed.

As a means to recover from this clogging, a tape with abrasive action is wound around a reel inside the cassette, a cassette exclusively used for head cleaning is manufactured, and this cassette is transferred to the VT.
Conventionally, a method has been widely used in which a clogged magnetic head is recovered by attaching the tape to a magnetic head and running the tape.

These conventional tapes are either magnetic or non-magnetic, and in either case, the tape is stored in a cassette without any recording, and the cassette is inserted into a VTR to record or play back. I ran the tape in one of the modes and performed the rig. and usually 1
The time required for each use was approximately 10 seconds, and the polishing was limited to three times in order to prevent wear and tear on the magnetic head.

However, when cleaning the magnetic head, the user may forget to stop running the tape and perform cleaning for longer than the time limit. At this time, if the VTR mode is the reproduction mode and the tape running speed is the slowest mode, the magnetic head must be cleaned for a long time, which poses a problem of adversely affecting the life of the magnetic head. Furthermore, in the recording mode, the tape running speed is constant and relatively slow, so a similar problem occurs. There is also a method of adding magnetism to the head cleaning cassette, recording normal images and audio on this tape, and playing it back at the same time as cleaning to determine whether the magnetic head has recovered from clogging. Since the magnetic tape comes into sliding contact with the video head or the audio head during recording, it has the disadvantage of accelerating the wear of the magnetic head.

(Problems to be Solved by the Invention) As described above, according to the conventional head cleaning cassette, the tape can be run in either recording or playback mode when cleaning the magnetic head, and the tape running speed is also limited. Therefore, if the tape running speed is set to the slowest speed in recording mode or playback mode, the magnetic tape may slide against the magnetic head for a long time when the user forgets to stop tape running, causing the magnetic head to Problems such as wear and other adverse effects were rare.

The present invention was devised in view of these points, and it is an object of the present invention to provide a head cleaning cassette that can minimize the occurrence of adverse effects such as abrasion on the magnetic head even if the user forgets to stop tape running. shall be.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for cleaning a magnetic head wound around a pair of reels housed in a cassette and provided in an apparatus. In a head cleaning cassette having a cleaning tape for carrying out the cleaning, the tape is magnetized, a speed control signal for the fastest playback mode in the apparatus is recorded on the tape, and the cassette is provided with means for preventing accidental erasure. It is something.

(Function) According to the above configuration, the cassette cannot be used in the recording mode, but can only be used in the playback mode, due to the erroneous erasure prevention means provided on the cassette. Also, when this cassette is used in playback mode, the speed control signal for the fastest playback mode of the device is recorded, so when this cassette is installed in the device and the tape is running, the tape running speed will be Automatically becomes the fastest speed. As a result, even if you forget to stop tape running when using a head cleaning cassette tape, the time the tape is in sliding contact with the magnetic head is minimized, minimizing the occurrence of adverse effects such as wear on the magnetic head. Mud is formed.

(Example) Hereinafter, an example of the head cleaning tape according to the present invention will be described in detail.

In a VH8 system VTR, the tape running speed is set to approximately 0.7 m/min during normal recording, approximately 2 m/min during playback in SP mode, and approximately 0.7 m/min in EP mode. The tape in the head cleaning cassette according to this embodiment is magnetized, and a speed control signal (control signal) for SP mode is recorded in advance.This tape is typically 11 m in length. It is wound around a pair of reels housed in a cassette. Also, this cassette has a known claw for preventing accidental erasure broken off for the reason described below.

Next, the operation of this embodiment will be explained. When cleaning the magnetic head by attaching a cassette configured as described above to a VTR, the cassette cannot be used in the recording mode and cannot be used in the playback mode because it has measures to prevent accidental erasure (the mold is folded). Only available. When used in playback mode, since the speed control signal for SP mode is recorded on the tape, the control head detects this signal and automatically moves the tape to the fastest tape running speed, approximately 2 m/min. The machine runs for several minutes and cleans the magnetic head. Therefore, if the length of the tape is constant at 11 m, even if you accidentally forget to stop the tape during use, the tape will run for the shortest time, minimizing the occurrence of adverse effects such as wear on the magnetic head. It can be suppressed.

According to this embodiment, when cleaning the magnetic head with a head cleaning tape, even if the stop operation is accidentally forgotten, the adverse effects on the magnetic head can be minimized. Furthermore, since a control head is used when recording speed control signals on the tape, a video head is not required, and video track linearity during recording is also not required, making tape production easier.

In the above embodiment, a head cleaning cassette used in a Vt-1s type VTR was explained, but it can be similarly applied to a head cleaning cassette used in a β type VTR, and the speed control signal in this case is β.
■Just make it a mode. The present invention can also be applied to magnetic recording and reproducing apparatuses other than VTRs, in which information is recorded and reproduced on a magnetic tape using a magnetic head, and similar effects can be obtained.

Also, the length of the tape is not limited to 17m,
Needless to say, the tape running speed is not limited to 2 m/min.

F Effects of the Invention As explained above, according to the head cleaning cassette of the present invention, the fastest speed control signal is recorded on the tape, and the cassette is provided with a means for preventing erroneous erasure, so that the magnetic head cleaning using the tape is possible. Even if one forgets to stop tape running at times, the occurrence of adverse effects such as friction on the magnetic head can be minimized.

Agent: Patent Attorney Noriyuki Chika Same as Hiroshi Uji

Claims (1)

[Claims] In a head cleaning cassette, the cleaning tape is wound around a pair of reels housed in the cassette and is used to clean a magnetic head installed in an apparatus. A head cleaning cassette, characterized in that a speed control signal for the fastest reproduction mode is recorded therein, and the cassette is provided with means for preventing erroneous erasure.