JPS6030006B2 - erase head device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a direct current erasing head device using a magnet, and its purpose is to enable a complete erasing operation.

Structure of the conventional example and its problems A conventional DC erasing head device has a structure as shown in FIG. 1, for example.

In other words, 1 is the erase head main body, and this erase head main body 1
The eraser core 2 is divided into three upper and lower parts and is magnetized such as N, S, and N so that the same magnetic poles are not adjacent to each other. 3 is a recording/reproducing head body, 4 is a recording/reproducing core provided in this head body 3, 5 is a tape guide, 6 is a tape,
A indicates the running direction of the tape.

If such an erasing head is used, the tape 6 can be
The N-pole magnetized portion 7, the S-pole magnetized portion 8 of the divided erase core 2,
Although it is saturated and erased by the N-pole magnetized portion 9, due to differences in the magnetization method of the core 2 and variations in magnetization strength, as shown in FIG. However, due to this non-magnetized portion 10, incomplete erasure portions 11 are generated between the erased tracks 7a to 9a erased by the respective magnetized portions. OBJECT OF THE INVENTION The present invention overcomes these conventional drawbacks.
To provide an erasing head device capable of complete erasing with a simple configuration.

Configuration of the Invention A tape in which the erasing core constituting the erasing head is divided into two core parts, left and right, and of these two core parts, the core part located on the upstream side with respect to the tape running direction is erased. The height is greater than the width of the upper track and magnetized to N or S pole, and the other core is divided into an odd number of 3 or more pieces vertically and magnetized so that the same poles are not adjacent to each other. This makes complete erasure possible.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG.

Components in FIG. 3 that are the same as those in FIG. 1 are given the same numbers and their explanations will be omitted. In the figure, 12 is the erase head main body;
This main body 12 is equipped with an erasing core 13. This erasing core 13 is divided into left and right parts into two core parts 14,
15, the core part 14 located on the upstream side with respect to the tape running direction is magnetized to the S pole at a height equal to or greater than the width of the track on the tape 6 to be erased, and the other core part 15 is magnetized 3 times vertically. They are divided into N, S, and N magnets so that the same polarity is not adjacent to each other. According to such a configuration, as shown in FIG.
, even if a non-magnetized portion 19 occurs between the N-pole magnetized portions 18,
Since the entire width of the track is erased in the core portion 14 before being erased in the core portion 15, incompletely erased portions will not remain between the tracks 16a to 18a erased by the magnetized portions 16 to 18. Can be completely erased.

In addition, the same effect can be obtained even if the core part 14 is magnetized to the N pole in the above embodiment, or even if the core part 15 is magnetized by dividing it into five parts, seven parts, etc. Effects of the Invention As explained above, according to the erasing head device of the present invention, the track to be erased on the tape can be completely erased.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional erasing head device, FIG. 2 is a diagram explaining its erasing state, FIG. 3 is a front view of an erasing head device in an embodiment of the present invention, and FIG. 4 is its erasing state. FIG. 6...Magnetic tape, 12...Erasing head body, 13...Erasing core, 14, 15...Core part, 16-18...Magnetized Part, A: Running direction of the magnetic tape 6. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 The erasing core constituting the erasing head is divided into two core parts, left and right, and of these two core parts, the core part located on the upstream side with respect to the tape running direction is the one on the tape to be erased. The feature is that the height is greater than the width of the track and it is magnetized to N or S poles, and the other core is divided vertically into an odd number of 3 or more pieces and magnetized so that the same poles are not adjacent to each other. erasing head device.