JPS5945772A - Automatic adjusting device of magnetic video recorder and reproducer - Google Patents

Abstract

PURPOSE:To attain initial adjustment without manual operation, by storing a manipulated variable where a VTR reaches a preset normal state after the required manipulated variable for the initial adjustment is changed and outputting the stored manipulated variable at the normal using state of the VTR afterwards. CONSTITUTION:A standard tape is set to a reproducing mode, and a time difference tau between a reproducing vertical synchronizing signal V after stable running and a head switching signal SW formed by passing a signal of a tag head 6 through a voltage control delay circuit 13 is measured. Then, the calculation of tau-6.5H is performed, and when the result [tau6.5H] is a prescribed errror DELTA(e.g., 0.5H), a value of an OP is written in a PROM 2 through a device 22 to stop the VTR and a microcomputer. Since the value store in the PROM 2 is outputted to the OP through a device 23 at the normal operation, the phase difference between the V and the SW is kept almost to 6.5H. Thus, in insertint once an adjusting tape and a jig once, the initial adjustment at the manufacture of the VTR is performed automatically by having only to give power to the VTR.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic adjustment device that automates the initial adjustment during production of a magnetic recording and reproducing device (VTJ').

A VTR is composed of a large number of electrical and mechanical parts, each of which has its own initial deviation. Requires numerous initial adjustment steps in the source circuit, ■T 11. This was a major factor in the increase in costs.

For example, in the case of the servo circuit that is essential for running a VTR, the speed adjustment of the rotating cylinder motor and capstan motor, tracking adjustment using standard tape to ensure compatibility, and phase l between the playback synchronization signal and the rotating head cylinder.
1lA! In order to speed up these adjustments, adjustment jigs, adjustment jigs, etc. are required.
Adjustment methods are constantly being devised and improved, but
We have not yet reached the stage of fully automating the initial adjustment.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic adjustment device for a magnetic recording/reproducing device which eliminates the above-mentioned drawbacks of the prior art and is capable of increasing the initial percentage by +491 without having to worry about obtaining the device.

In order to achieve this purpose, the present invention changes the amount of operation necessary for initial adjustment, and when the VTR reaches a preset normal state, stops the change and stores the amount of operation at that point in memory. However, in the subsequent normal use state of V '1' R, a means for outputting the stored manipulated variable was adopted.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an automatic adjustment device for a magnetic recording and reproducing apparatus according to an embodiment of the present invention.

In this figure, 1 is a microcomputer with a built-in initial adjustment program as well as a VTR system control program, and 2 is a programmable read-only memory (electrically erasable, ultraviolet erasable) for storing manipulated variables. 3 is a DA converter, 4 is a servo circuit, 5 is a cylinder motor, 6 is a tack head for detecting the rotational phase of the cylinder motor, 7 is a capstan motor, and 8 is a Signal circuit, 9 is a jig that adds +J only during adjustment, 10 (zu: P
The power supply for the ROM (because there are many cases where the capacity of the VTR is insufficient), 11 is a switch, and 12 is an AD converter. Figure and g 5
Using the flowchart shown in FIG. 4 and FIG. 4, the adjustment points of 2) 5q will be explained using the automatic rA kidney of the servo circuit of a VTR as an example.

The first t-circumference part is the number V in playback synchronization with the standard tape.
and the rotating head cylinder 5.

At No. 31 No. 1, when the switch 11 of the jig 9 is turned on and the VTR is energized, the terminal 21 goes to the initial adjustment mode because the terminal 21 is L#.

Next, the standard tape inserted in advance is set to playback mode. After the running is stabilized, the time difference r between the reproduced vertical synchronization signal (2) and the head switching signal SW (corresponding to the cylinder 50 rotation phase) created by passing the tuck head (B) signal through the voltage control delay circuit 13 is measured.

01) τ can be changed by the voltage of
It was adjusted so that it was the own ear signal period). This OP corresponds to the amount of operation necessary for the 614 condyles, and ■ and SW correspond to the signal information necessary for the adjustment.

Next Q performs τ-6.5H, and if the result is positive, OP is reduced and the delay time of 13 is reduced, and negative landing is increased (-)P and delay of C15. Pursue jealousy.

If the result [τ-<S, 5114) is less than the predetermined error Δ (for example, 05)], the value of 013 at that time is transferred to PR,0M2 through 22, and V',i''R is obtained.

The frame is stopped and the microcomputer is stopped (SWI is an abbreviation for Software Interrupted and enters an interrupt wait state).

When Cr -6,sH) is 7 or more, the town is τ-6,5,H
After forming a negative feedback loop returning to the calculation, in normal operation, the Phi value stored in i'ROI~12 is outputted to OP through 23, and the phase difference between ■ and SW is maintained at about 6.5H.

Next, the second adjustment point is the tracking preset at the time of recording. The operation of the eye movement toning field will be explained using chart 70 in FIG. 1zu VTR.

When energized, the terminal 21 is set to "L" and the mode is set to initial setting mode.Next, set to recording mode and record the test signal for a predetermined time, then set to rewind mode and rewind to the original position of 1 car. The tracking preset control No. 100 T I (, (tracking of the head on the cylinder and the tape can be changed by the voltage of 'J') is changed by a unit amount, and the playback output No. 1 (, F The level is taken into the microcomputer 1 by the AD converter 12.

Then, a negative feedback loop is constructed so that RF is maximized, and the value of TR that maximizes R and F is written into P It, OM 2 through 22.

The procedure for obtaining the thickest value is the same as in the previous example, so the details are omitted.

The subsequent operation is similar to the previous example.

Note that if the first and second area adjustment areas cannot be performed at the same time, it is better to program the system so that the second adjustment is performed after the first adjustment is completed.

Although the example of the servo circuit has been described above, it goes without saying that the automatic adjustment device can be constructed using the same concept for signal circuits, power supply circuits, and system control circuits.

The Ushida PH, 0M2, AD converter 12, and DA converter 6 can be built into the microcomputer, and the present invention can be realized compactly in that case.

As explained above, according to the present invention, once the adjustment tape and jig are inserted, all that is left to do is to energize v'i'g, and the V'LM? It is possible to perform initial adjustments during manufacturing, contributing to reductions in manufacturing man-hours and costs.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an automatic adjustment device for a magnetic recording and reproducing device according to an embodiment of the present invention, FIG. 2 is a signal waveform diagram of each part for detailed explanation of the present invention, and FIGS. 3 and 4 are FIG. 3 is a flowchart diagram for explaining the present invention in detail; FIG. 1...Microcomputer 2...I) It, OM 6...I) A converter 4...Servo circuit 5...Cylinder Motor 6... Tack head 7... Capstan motor 8... Signal circuit 9... Adjustment jig 10... Power supply 11... ...Switch 12...AD converter 1st (!1 O?Figure V-N?" - Ichiga 3 times

Claims (1)

[Claims] means for setting the magnetic recording/reproducing device to each mode necessary for initial adjustment; means for inputting signal information necessary for each adjustment; means for outputting the amount of operation necessary for each adjustment; Magnetic recording and playback characterized by having a negative feedback loop for changing the manipulated variable so that it becomes a predetermined value, and a means for storing the manipulated variable after completion of adjustment and thereafter outputting the manipulated variable after completion. Automatic adjustment device of equipment.