JP2001014621A - Head and tape contact state observing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a running of picture while observing the contact state of a head and a magnetic tape, to improve the observation precision and to make efficiently and easily changeable the observation location. SOLUTION: This device is provided with a transparent dummy head 3 that is mounted on a rotary drum 1 and a reflection mirror 2 whose optical axis is aligned to the rotary shaft of the drum 1. An image corresponding to the contact condition of a magnetic tape and a head is piched up by a CCD camera at a prescribed location and the image is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head-tape contact state observing apparatus, and more particularly to a head-tape contact state observing apparatus having a transparent dummy head and a reflecting mirror.

[0002]

2. Description of the Related Art Conventionally, an apparatus for observing a contact state between a magnetic tape and a transparent dummy head attached to a rotating drum has been known.
JP-A-1-303620, JP-A-3-58309,
JP-A-4-281208, JP-A-4-90006,
It is disclosed in Japanese Utility Model Laid-Open No. 4-101911 and the like. In the observation devices disclosed therein, the transparent dummy head differs in the tape sliding surface and shape (T-groove processing), the method of bonding glass, and the like, but the sliding surface between the magnetic tape and the transparent dummy head is different. Since the opposite rear surface is formed into a 45-degree reflecting mirror and attached to the rotating head, the light to the transparent dummy head or the light from the transparent dummy head passes just above the transparent dummy head. A hole was formed, and the microscope was arranged so that the optical axis of the microscope was aligned with the hole and observed.

[0003]

However, in the above-mentioned conventional observation apparatus, the hole through which the light from the transparent dummy head passes and the hole through which the light to the transparent dummy head passes are almost completely formed in the transparent dummy head. When the rotating drum is rotated, the holes are rotated at a high speed equivalent to the peripheral speed of the drum, so that the flow (blur) of the observed image is large, and the image data cannot be easily analyzed. There was a problem that sufficient accuracy could not be obtained.
In addition, it is necessary to move the microscope and adjust the optical axis each time the mounting state (posture) of the head is changed or the observation position (tape winding is 0 degree, 90 degrees, 180 degrees, etc.) is changed.
There was a problem that operability was extremely poor.

[0004]

According to the present invention, there is provided a rotary drum rotating in contact with a magnetic tape, a transparent dummy head mounted on the rotary drum, the transparent dummy head and the transparent dummy head. A reflective surface disposed at an angle of 45 degrees with respect to the contact surface with the magnetic tape, wherein the reflective surface is separate from the transparent dummy head, and the reflective surface is disposed on a rotation axis of the rotating drum; An optical element arranged with the optical axis aligned, and arranged above the rotating drum,
A light source disposed so that the light source is incident on the transparent dummy head via the optical element; a light source driving unit that drives the light source in synchronization with a rotation phase of the rotating drum; A head-tape contact comprising: an imaging device in which light reflected on a contact surface with a tape is incident via the transparent dummy head and the optical element; and a display device for displaying an image captured by the imaging device. A state observation device is provided.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a view showing an embodiment of the observation device of the present invention. A reflecting mirror 2 (hereinafter, also referred to as a reflecting mirror 2) is disposed on a rotating shaft of the rotating drum 1 in contact with a magnetic tape (not shown), and a transparent (dummy) is provided on an end surface of the rotating drum 1. The head 3 is mounted. The reflecting surface of the reflecting mirror 2 is a magnetic tape, a transparent head 3 and a contact surface (part)
The reflecting mirror 2 is mounted on a holder H for aligning the optical axis of the reflecting mirror 2, as shown in FIG. The three screws S are screwed to the rotary drum 1 via a compression spring.
By adjusting the position and posture of the rotary mirror 1, the optical axis of the reflecting mirror 2 and the rotating axis of the rotary drum 1 can be adjusted.

The description will be continued with reference to FIG. The rotary drum 1 is rotationally driven by a motor 4 and a servo drive unit (not shown) electrically connected thereto.
A Hall element 5 is mounted at a position opposite to a magnet (not shown) arranged on the outer periphery of the rotor of the motor 4, and a PG signal relating to the rotation phase of the rotary drum 1 is output from the Hall element 5. .

A factory microscope 6 is mounted on the rotating shaft of the rotating drum 1.
(Hereinafter, also referred to as a microscope 6), and the optical axis of the microscope 6 and the rotation axis of the rotary drum 1 are arranged so as to coincide with each other.

The microscope 6 has an objective lens 7 for a factory microscope.
(Hereinafter, also referred to as an objective lens 7), and a xenon lamp 8 is disposed on the upper surface of the microscope 6 to detect the rotational phase of the rotary drum 1 described above. The output of the Hall element 5 is supplied to a delay circuit 9 and a strobe controller 10, and the rotation drum 1
The xenon lamp 7 is driven in synchronization with the rotation phase of. The delay time of the delay circuit 9 is configured to be variable. By variably controlling the delay time, the light emission timing of the xenon lamp 8 can be shifted.
The observation position can be moved.

A half mirror 11 is provided inside the microscope 6.
The light emitted from the xenon lamp 8 passes through the half mirror 11 and the reflecting mirror 2 through the objective lens 7.
And is incident on the transparent head 3, and this incident light is reflected on the contact surface (part) between the magnetic tape T and the transparent head 3,
After entering the transparent head 3 again and being reflected by the reflecting mirror 2,
CC reflected by the half mirror 11 through the objective lens 7
The light enters the D camera 12.

The output of the CCD camera 12 is displayed on a monitor 14 via a VTR 13 and can be recorded by a video printer 15. CCD
The light captured by the camera 12 becomes an image of interference fringes, and the interference fringes as shown in FIG. 3 are displayed on the monitor.

By rotating the rotating drum 1, the transparent head 3
FIG. 3 shows an image obtained by capturing the state of contact between the magnetic tape T and the magnetic tape T. The image flow becomes counterclockwise as shown in FIG. 3, and since the image rotation angle at this time is very small, the image flow can be made very small.

On the other hand, since the image flow in the conventional apparatus moves in the horizontal direction as shown in FIG. 4, observation becomes very difficult. On the other hand, the image flow of the present invention is, for example,
The rotating drum of 62φ has 1 /
It can be reduced from 20 to 1/100.

When the observation position is changed, the observation position can be changed by controlling the delay time of the delay circuit 8 shown in FIG. 1 as described above. There is no need to do so, and operability is improved.

[0014]

As described above in detail, according to the present invention, it is possible to reduce image deletion when observing the contact state between the head mounted on the rotary head and the magnetic tape, and to change the observation position. Also has the advantage that it can be changed efficiently.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a tape / head interface observation device according to the present invention.

FIG. 2 is a view showing an adjusting mechanism of the embodiment of the tape / head interface observation device according to the present invention shown in FIG. 1;

FIG. 3 is a view for explaining an observation state of the embodiment of the tape / head interface observation apparatus according to the present invention.

FIG. 4 is a diagram for explaining an observation state of a conventional tape head interface observation device.

[Explanation of symbols]

 1 rotating drum, 2 reflecting mirror, 3 transparent head, 4 motor, 5 Hall element, 6 factory microscope 7 factory microscope objective lens, 8 xenon lamp, 9 delay circuit, 10 strobe controller, 11 half mirror, 12 CCD camera 13 VTR 14 Monitor 15 Video printer T Magnetic tape H Holder S Screw

Claims (1)

[Claims] 1. A rotating drum that rotates in contact with a magnetic tape, a transparent dummy head attached to the rotating drum, and a 45 ° angle with respect to a contact surface between the transparent dummy head and the magnetic tape. An optical element that is separate from the transparent dummy head, and that is arranged on the rotation axis of the rotating drum with the optical axis of the reflecting surface aligned; A light source disposed so that the light source is incident on the transparent dummy head via the optical element; a light source driving unit that drives the light source in synchronization with a rotation phase of the rotating drum; An imaging device in which light reflected on a contact surface between a head and the magnetic tape is incident via the transparent dummy head and the optical element; and a display for displaying an image captured by the imaging device Head-to-tape contact observation apparatus and a location.