JPS6128255Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head position adjustment device.

A pair of magnetic heads that rotate and run within a slit of a tape guide cylinder of a video tape recorder are mounted on a head base that is rotatably disposed inside the cylinder. Since the suitability of the mounting position directly affects the recording and reproducing characteristics, it is essential to adjust the position of the magnetic head with respect to the head base, that is, to adjust the position of the magnetic head in the circumferential (left and right) and radial (front and back) directions. Therefore, in the past, a microscope was placed for each of a pair of magnetic heads to observe the tape contact surface of the magnetic head, and in the circumferential direction, the positional deviation with respect to the reference marker was detected, and in the radial direction, the image blur due to the difference in the depth of focus was detected. I was making position adjustments to correct it. The workability was very poor, and in order to improve this, a total of four imaging means including microscopes and cameras were placed in two directions perpendicular to the pair of magnetic heads on the head base, and their outputs were monitored. I tried displaying them individually on the screen of the display means, but even then, it was necessary to perform the work while alternately observing two separately placed screens to adjust the position of one magnetic head, and the workability was still poor. There was a problem.

The present invention displays the front and plane or bottom surfaces of the magnetic head attached to the head base separately on the screen of one display means, making it possible to perform position adjustment work while observing images from two directions at the same time. The purpose of this invention is to provide a device that does this.

Next, the present invention will be explained based on illustrated embodiments. FIG. 1 shows a head base on which a magnetic head whose position is to be adjusted is mounted, and FIG. 2 shows a sectional view of the main part thereof. The head base 1 is attached to a head drive motor and attached to the guide cylinder as described above, but prior to that, it is attached to the left and right sides of a pair of head mounts 4 and 5 to which a pair of magnetic heads 2 and 3 are respectively fixed. It is also necessary to adjust the position in the front and rear directions. As shown in FIG. 2, a stator 7 that loosely fits into the adjustment hole 6 of the head mount 4 and is screwed onto the head base 1 moves the head mount and the magnetic head fixed thereto in the front-rear direction (in the direction of arrow A). The magnetic head is configured to be adjustable in the horizontal and horizontal directions (direction perpendicular to the plane of the paper), and the magnetic head can be adjusted in the vertical direction (direction of arrow B) using an adjuster 8.

FIG. 3 shows a configuration diagram of the device of the present invention. 9 and 10 are head mounting bodies 4 on the head base 1;
First and second imaging means take images of the tape contact surface of the first magnetic head 2 fixed to the magnetic head 2 from the front and bottom sides, respectively. , a fourth imaging means. Each imaging means is a microscope 9.
A, 10A, 11A, 12A and TV camera 9
B, 10B, 11A, and 12B, each of which is arranged at a predetermined position with respect to the head base 1. Reference numeral 13 denotes a first unit which inputs and synthesizes each signal from the first and second imaging means and the reference line generating means 14.
A wiper 15 is a second wiper that combines signals from the third and fourth imaging means and the generating means 14. Reference numerals 16 and 17 are first and second display means having screens 18 and 19 for individually introducing the outputs of these respective wipers. Each of the above wipers 13,
15 is constructed to be able to display an image as shown in FIG. 4 on screens 18 and 19. That is, images by the first and third imaging means 9, 11 are displayed on the upper half of the screen, and the second,
The images taken by the fourth imaging means 10 and 12 are displayed in the lower half of the screen, and the reference lines 20 and 21 from the generation means 14 are also displayed as shown in the figure.

Using such a device, the first
To adjust the position of the magnetic head 2, set the head base in a predetermined position and move the first magnetic head to the first and second positions.
Images are taken by the imaging means 9 and 10, and the position of the head mounting body 4 is adjusted so that the taken images have the positional relationship shown in FIG. 4 with respect to the reference lines 20 and 21, and fixed at that position by the stator 7. Just do it.
In FIG. 4, image 22 is a front view of the tape contacting surface of the magnetic head, and image 23 is a view of it from below.The horizontal movement of the magnetic head is based on the reference line 20 of image 22. The movement of the magnetic head in the horizontal direction corresponds to the movement of the magnetic head in the horizontal direction relative to the image 21, and the movement of the magnetic head in the longitudinal direction corresponds to the movement of the magnetic head in the vertical direction with respect to the image 21. Furthermore, in FIG. 4, 24 is an operating gap of the magnetic head, and 25, 25 are grooves for defining the track width of this operating gap, and the grooves are filled with glass or the like. The adjustment for the other magnetic head 3 on the head base 1 can be similarly performed while observing the screen of the second display means 17. In adjusting the positions of the first and second magnetic heads, there is no correlation between them, so instead of using two display means as in the above embodiment, one display means may be used by switching. .

As mentioned above, according to the device of the present invention, the adjustment of the position of the magnetic head relative to the head base in the left-right and front-back directions is displayed side by side with two images of the tape contacting surface of the magnetic head observed from the front and from below or above. Since this can be done while monitoring the screen, it has become possible to significantly improve the work efficiency.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the head base, FIG. 2 is a sectional view of a central portion thereof, FIG. 3 is a block diagram of the apparatus of the present invention, and FIG. 4 is a front view of a screen displaying an image. Explanation of main drawing numbers, 2, 3...first and second magnetic heads, 4,5...a pair of head mounts, 1...head base, 9, 10, 11, 12...first ~4th
Imaging means, 16, 17...first and second display means.

Claims (1)

[Scope of utility model registration request] A pair of head mounts, each with a fixed magnetic head, are temporarily fixed so that the tape contact surfaces of each magnetic head face opposite directions, and their positions in the left-right and front-back directions can be adjusted. a first imaging means for imaging the tape contacting surface of one of the magnetic heads from the front thereof, a second imaging means for imaging the tape contacting surface from below or above the magnetic head, and the other magnetic head. A third imaging means takes an image of the tape contacting surface from in front of the tape contacting surface, a fourth imaging means takes an image of the tape contacting surface from below or above the third imaging means, and the images by the first and second imaging means are captured on one screen. 1. A magnetic head position adjustment device comprising: a first display means for simultaneously displaying divided images on one screen; and a second display means for simultaneously displaying images from the third and fourth imaging means divided on another screen.