JPS59154626A - Cleaner of recording or reproducing head - Google Patents

Abstract

PURPOSE:To improve the cleaning efficiency of a head by vibrating relatively a recording/reproducing magnetic head and a cleaning member in two orthogonal directions via an electromechanical converring element by means of AC power supply. CONSTITUTION:A bimorph plate 8 consists mainly of converting elements 8a, 8b made of a piezoelectric crystal plate, the element 8a is provided with an outer electrode 9a and an intermediate electrode 9b, and the element 8b is provided with the intermediate electrode 9b and an outer electrode 9c, and each electrode is connected to a driving AC power supply 10. The converting elements 8a, 8b represent the converting characteristic inverse to each other. Thus, the bimorph plate 8 is vibrated according to the frequency of the AC power supply, the magnetic head 3 is vibrated in the direction C at the frequency, the relative movement between the magnetic head 3 and a cleaning sheet 1 is attained also in the lengthwise direction of the gap of the magnetic head 3, and dust clogged in a head gap 7 is removed efficiently.

Description

TECHNICAL FIELD The present invention relates to a cleaning device for a recording or reproducing head, and the present invention relates to a cleaning device for a recording or reproducing head, in which a head and a cleaning member are moved relative to each other in two directions substantially perpendicular to each other to clean the head. The challenge is to find ways to improve efficiency.

Conventional head cleaning means for recording or reproducing devices include those that remove dirt from the head surface using a solvent, and a rotating member provided with a cleaning wrap material, such as a cleaning sheet, or a rotating member that removes the portion where recording tracks are to be provided. The recording medium provided with the wrap material, for example, a recording sheet having a cleaning track with the wrap material adhered to the outside of the recording track, faces the head and a relative movement is performed between the two to remove dirt on the head. It is suggested that something be done.

This invention relates to the latter improvement among the above. For example, in a device that cleans the head by rotating the cleaning sheet or recording sheet having a leaning track while facing the head, the direction of relative movement between the rotating sheet and the head is the rotation direction of the rotating sheet. The cleaning effect may not be sufficient because the cleaning effect is only this is,
As will be explained in detail later, when the recording or reproducing head is a magnetic head, its disadvantages are significant. In other words, since the rotating direction of the rotary sheet is perpendicular to the head gap, it is not possible to sufficiently remove dust such as magnetic powder stuck in the head gap.6 To solve this problem, a head transfer mechanism is used to move the head It has been proposed to perform cleaning by moving the head in a direction ``4-'', which is perpendicular to the rotational direction of the rotary sheet, but it is not possible to vibrate the L head of the head transfer mechanism at a high frequency. Cleaning effect is not sufficient.

OBJECTS OF THE INVENTION Accordingly, the present invention overcomes the above-mentioned drawbacks of the conventional cleaning device 4 and improves the head performance by causing relative movement between the recording or reproducing head and the member provided with the cleaning material in two substantially orthogonal directions. The object of the present invention is to provide a recording or reproducing head cleaning device that can improve the cleaning of young trees.

Structure of the Invention The present invention provides a drive unit (for example, a third The sheet rotation motor 2) shown in the figure; and an electromechanical transducer (also shown in FIGS. Board 8) What; AiJ record? tj air/mechanical conversion element (
(The first AC power source connected, whose frequency is "A")
Q Recording or reproducing - A device whose frequency is at or near the resonance frequency of the electromechanical transducer described in I when the RAD is supported (also the AC power source 10 in FIG. 5); The recording or reproducing head cleaning device is characterized by:

In the above, the recording or reproducing head refers to a recording or reproducing head such as a magnetic head, an optical head, or a capacitive head that records a signal or reproduces a recorded signal, and is a member equipped with a cleaning system. refers to a recording medium provided with a dedicated cleaning section or the aforementioned cleaning track for cleaning the recording or reproducing head. Here, the form of the dedicated cleaning unit or the recording medium may be in various forms such as sheet, disk, tape, or drum. Referring to the medium on which recording or reproduction is performed in No. 48, 5. In addition, in the above, reference C to the specific examples described later: This invention is not intended to limit the scope of this invention in any way, and this invention does not fall within the scope of the above claims. 5, 611 can be changed as necessary.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific examples of a conventional recording or endogenous head cleaning device and a recording or reproducing head cleaning device according to the present invention will be described in detail below with reference to the drawings.

The following description will be made using an example in which the recording or reproducing head is a magnetic head and the part provided with the cleaning groove is a rotating sheet.

A conventional recording or reproducing head cleaning device (FIG. 1).

FIG. 2) FIG. 1 is a front view of a conventional recording or reproducing head cleaning device, and FIG. 2 is a front view of its main parts. These L
4, reference numeral 1 denotes a cleaning sheet which is a dedicated 114 cleaning member, and a valley-sweeping wrap material is provided, for example, by coating, over almost the entire surface facing the recording or reproducing head at least during loading. 2 (is a sheet rotation motor, 3 is a magnetic head that is a recording or (1j raw head),
4 is -\rad holder, 5 is screwed to head support 4 [[? ] It is a rotating screw, and is rotated by a feed motor (not shown). Reference numeral 6 denotes a head support base 4 i/ζ fitting''fZ) guide, and 7 a head gap.

Due to the configuration of upper Rt:, the cleaning seed 1 is rotated in the direction B in Fig. 2 during cleaning.
They were removing dirt and other dirt that had arrived. However, at the head gap 70 portion, the cleaning sheet 1 is aligned with the gap 7 in the 1n angle direction. Gap 7 for bb''
2) It was difficult to sufficiently remove dust such as magnetic powder.

In order to solve this problem, a method has been proposed in which cleaning is performed by rotating the screen 1-5 under pressure in the first figure and moving the magnetic head 6 in the direction C (longitudinal direction of the spatula gap) in the first figure. ing. However, in this method, since the screw 5 is rotated by the feed motor, the magnetic head 6 is rotated at a high frequency.
Since it cannot be perturbed in the direction C in the figure, the cleaning effect is sufficient.

Specific example of the recording or reproducing head according to the present invention
l# (FIGS. 5 to 5) FIG. 5 is a top view of a specific example of the cleaning device method for a recording or reproducing head according to the present invention, FIG.
The figure shows the structure of the bimorph plate directly in this cleaning device and its 711. A diagram showing the electrical connections.

7 to 5, a bimorph plate, which is an example of the structure shown in FIGS. 1 and 2, is attached to the head stand 4, and 1if1. Supports the air head.

The bimorph plate 8, as shown in FIG.
The conversion elements 3, a, and 3b are mainly composed of L-body crystal plates, and the element 8a has an outer 9111' electrode 9a and an intermediate electrode 9b, and the element 8b has an intermediate electrode 91) and an outer lio'.
Open electrodes 9C are provided respectively. N, pole 9 a, 9
c and 't11 pole? b is connected to 10 drive AC power sources. The conversion elements 8a and 8b exhibit opposite conversion characteristics to each other in the electrical connection shown in FIG. do. The bimorph plate 8 is attached to the head support base 4 via, for example, a smoother near one end (near the left end in the figure), and the magnetic head (head chip) 5 is attached directly or directly to the other end (near the right end in the figure). Supported via a mounting plate. Note that an electromagnetic vibration element such as a voice coil can also be used as another example of the electro-mechanical conversion element.

The AC power supply 10 generates a frequency at or near the resonance frequency of the electro-mechanical transducer (bimorph plate 8) supporting the magnetic head. Here, to explain an example of the resonant frequency of the bimorph plate 8 supporting the magnetic head 6, the bimorph plate 8 is supported in a cantilevered manner at one end, and its free length l (FIG. 5) is 12n+n+, and the width W is 6mm
, thickness d is 0.6 mm.

When the mass of the head is 0.4 g, the resonance frequency is 9
501-(Z, 1;). Since this vibration system has a high Q, the town decided to circularly adjust the frequency of the AC power supply. However, even if the frequency deviates slightly from the resonant frequency, there is no practical problem.

In the above configuration, when the AC power supply 10 is turned on in the head cleaning mode, the bimorph plate 8 vibrates according to the frequency, and the magnetic head 6 rotates at the frequency in the direction C in FIGS. Relative movement between the magnetic head and the cleaning tape 1 also occurs in the longitudinal direction of the gap of the magnetic head (in the direction of the AA force in FIG. 4). Since the resonance frequency of the bimorph plate 8 is set at or near the resonance frequency of the bimorph plate 8, the magnetic head 5 vibrates at a high frequency and with a large amplitude of 1 μm, thereby efficiently removing dust stuck in the head gap 7. be able to.

As a modification of the apparatus shown in FIGS. 6 to 5, when using a cleaning member in which a cleaning track is provided on the outside of a portion of the rotating magnetic sheet where a recording track is to be provided, for example, it is possible to use IJ -, -, - directing the recording or reproducing head to face the recording or reproducing head for relative movement; Also, when using a dedicated cleaning tape with cleaning material on almost its entire surface or a recording tape with a cleaning track on the front or rear end, you can clean it by running it in the same way as a regular recording tape. can. When using other recording or reproducing heads and cleaning members, the procedure described in L can also be carried out.

Effects of the Invention According to the present invention, the recording or reproducing head can be cleaned using the cleaning material '75.
- In an apparatus for cleaning a recording or reproducing head by making a relative movement between the head and the head facing each other, the recording or reproducing head is in a supporting state f.
Since the mechanical transducer is vibrated in a direction substantially perpendicular to the direction of the relative motion at or near the resonant frequency of the mechanical transducer, the recording or reproducing head can be vibrated at a high frequency and with a large amplitude. By eliminating the need for a large drive current due to the vibration of the recording or reproducing head, the recording or reproducing head and the cleaning member can be cleaned efficiently by performing relative motion in two directions that are substantially orthogonal to each other. It can be performed.

[Brief explanation of drawings]

FIG. 1 is a front view of a conventional recording or reproducing head cleaning device, FIG. 2 is a plan view of its essential parts, and FIG. 5 is a front view of a specific example of the recording or reproducing head cleaning device according to the present invention.
Figures 1 and 4 are plan views of the main parts thereof, and Figure 5 is a diagram showing the bimorph plate's 14 formations and their 7fi air connections in the apparatus shown in Figures 1 and 4. In the figure, 1 is a cleaning sheet which is an example of a member provided with a cleaning material, 2 is a sheet rotation motor, the filter is a magnetic head which is a recording or reproducing head, 7 is a throat gap of the magnetic head filter, and 8 is an electric/reproducing head. The mechanical conversion element is a bimorph plate, 10 indicates the source of AC 〒15; 11:) B [1≧1 foil?

Claims (2)

[Claims] (1) A drive device for making a recording or aging head face a member provided with a cleaning material and causing a relative movement between the two; and a drive device for supporting the recording or reproducing head and in the direction of the relative movement. an electric-to-mechanical transducer capable of displacement in a direction substantially perpendicular to the electric-to-mechanical transducer; - A cleaning device for a recording or reproducing head comprising: a frequency at or near the resonance frequency of a mechanical transducer; (2) The recording or reproducing head according to claim (1), wherein the recording or reproducing head is a magnetic head, and the direction of displacement of the electromechanical transducer is substantially the longitudinal direction of the head gap of the magnetic head. Playback head cleaning device.