KR0118016Y1 - Diagnostic tape of head drum for vcr - Google Patents

Abstract

This invention relates to a drum inspection tape for inspecting the performance of a drum used in a tape recorder.

This invention is designed by inspecting tapes having color pattern parts and bar pattern parts respectively formed on the upper and lower sides of the center of the screen. Not only is the inspection time shortened, but also the worker's trouble caused by the inspection of the drum is eliminated, so it is suitable for mass production system to improve the yield of the product.

Description

Tape for checking drums in tape recorders

(A), (b), (c) of FIG. 1 are drawings for explaining the inspection state of the drum by the conventional inspection tape;

(A) and (b) of FIG. 2 are diagrams for explaining the inspection state of the drum by the inspection tape according to the present invention;

3 is a view showing for explaining the angle of inspection of the drum by the inspection tape according to the present invention.

* Description of the symbols for the main parts of the drawings *

T: Inspection Tape CP: Color Patten

BP: Bar Patten

The present invention relates to a tape for drum inspection of a tape recorder, and more particularly, by allowing one inspection tape to simultaneously inspect various performances of a drum used in a video tape recorder (VTR). It is to reduce the number of process and inspection time to improve product yield.

In general, a video tape recorder is provided with a drum for recording a signal on a tape of a cassette seated on a deck or for reproducing a recorded signal on one side of the deck, and loading grooves are formed on both sides of the drum. In the loading groove, a pole base for loading and unloading the tape to the drum side is provided. Therefore, after loading the tape of the cassette seated on the deck to the drum, it is possible to record the signal or to reproduce the recorded signal on the tape moving along a certain path by the video head of the drum in accordance with each mode change.

By the way, when the drum is a two-head type, for example, two video heads are installed at the same height plane 180 degrees symmetrical position, and the angle (180 °) should be inspected, and the color, jitter and It is necessary to perform a linear inspection such as an envelope (Envelope), the angular rate inspection is the amount of spreading that appears on the screen as shown in Fig. 1 (a) using a pattern formed on one inspection tape (H'd) To check the tape.

In addition, the state of the screen shown in FIG. 2 (b) is for checking color, and (c) shows a state of screen for performing jitter inspection with the jitter waveform displayed on the screen using a jitter meter. Drawing.

However, only the standard mode state can be detected for the inspection to be angled, and for the inspection of color and jitter, each time the button is pressed during recording of the video tape recorder, the standard (SP) mode and the long time (EP) mode are selected. Standard mode test tape and long time mode test tape are used separately.

Therefore, the inspection of the drum as described above is used for each performance test by using a plurality of test tapes, which leads to the cumbersome problem of increasing the inspection process and at the same time takes a lot of inspection time is unsuitable for mass production system and the yield of the product is lowered The problem arises.

This invention has been devised to solve the conventional problems as described above, the object of the invention is a test tape that is recorded so that the color pattern portion and the bar pattern portion are formed on the upper and lower sides, respectively, centered on the center portion of the screen. By checking various performances such as color, jitter and angle of the drum at the same time, the number of work processes and inspection time are not only shortened, but also it is suitable for mass production system, which eliminates the inconvenience of the operator. To provide a tape inspection tape for the tape recorder to improve the yield of the.

A feature of this invention for achieving the above object is a test tape in which a pattern is formed to test the performance of a drum used in a tape recorder; There is a color tape for inspecting the color and jitter on the upper side centered on the center of the screen, and a bar pattern tape for inspecting the angle to be formed on the lower side thereof.

Hereinafter, one preferred embodiment of a tape for inspecting a drum of a tape recorder according to the present invention will be described in detail with reference to the accompanying drawings.

2 (a), 2 (b) and 3 are diagrams for explaining the inspection state of the drum by the inspection tape according to the present invention. First, as shown in FIG. 2 (a), the inspection tape ( In T), a color pattern part CP is formed on the upper side of the screen, and a bar pattern part BP is formed on the lower side of the screen.

Here, the color pattern portion CP and the bar pattern portion BP of the inspection tape T are manufactured by using a computer, and when the inspection tape T is reproduced by a video tape recorder, the video tape By the playback operation of the drum provided in the recorder, an image is formed on the screen as shown in Fig. 2B.

In this case, the image quality of the screen may be inspected by the color pattern unit CP formed on the upper side of the screen, and in the process of inspecting jitter inspection (screen fidelity), a screen in which a jitter meter is connected Jitter can be inspected by the jitter waveform shown in.

In addition, as shown in FIG. 3, when the drum is a two-head type system, it is possible to check the angle reduction that checks whether two video heads are in a symmetrical position of 180 °, which is the amount of flaring caused by the pattern of the screen ( It is possible to check whether the angle angle of the video head is produced within the error range by H'd, that is, skew.

On the other hand, since the envelope can be inspected by the video waveform, various performances of the drum are inspected at the same time by one inspection tape (T), thereby eliminating the need for a plurality of inspection tapes used for each inspection in the conventional drum. It can be easily applied to mass production systems, such as shortening the number of work processes and inspection time and eliminating the inconvenience of the operator due to the inspection of the drum.

As described above, the drum inspection tape of the tape recorder according to the present invention has a color pattern portion and a bar pattern portion formed around the center of the tape, so that the performance is simultaneously checked, thereby reducing the number of work steps and inspection time. In addition, it is a useful design that can be easily adapted to mass production systems and can improve the yield of products.

Claims (1)

An inspection tape in which a pattern is formed to inspect the performance of a drum used in a tape recorder; The color pattern part CP for inspecting color and jitter is formed on the upper side around the center of the screen, and the bar pattern part BP for inspecting the angle angle is formed on the lower side thereof. Tape for drum inspection of tape recorders.