JPH0546909A - Magnetic head - Google Patents

Abstract

PURPOSE:To position a magnetic tape at a high accuracy with respect to a magnetic detection part for a digital signal of a magnetic head and run it. CONSTITUTION:In a magnetic head provided with a magnetic detection part G1 for digital signals and a magnetic detection part G2 for analog signals, a positioning step 12a is formed on the side of the magnetic detection part G1 for digital signals and a guide 12b is so formed to be inclined forward on the side of the magnetic detection part G2 for analog signals. With the inclination of the guide part 12b, a magnetic tape T is energized toward the above positioning step 12a and is pressed onto the rim part Ta of the magnetic tape T. This allows the positioning of the magnetic detection part G1 for digital signals and the track at a high accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head in which a magnetic detection portion for digital signals and a magnetic detection portion for analog signals are formed, and particularly, a magnetic detection portion for digital signals and a magnetic tape are surely secured. In addition, the present invention relates to a magnetic head that can be brought into contact with each other without displacement in the width direction.

[0002]

2. Description of the Related Art FIG. 5 is a side view showing a conventional magnetic head for recording / reproducing analog signals. This magnetic head is composed of a head body 1 and a guide plate 2 fixed to the side surface of the head body 1. On the front surface 1a of the head main body 1, a gap of the magnetic detection part is located.
The magnetic detection unit is composed of a magnetic core embedded in the head body 1 and a coil wound around the core.
The facing gap of the magnetic core is exposed at the front surface 1a.

A concave portion 2c is formed in the guide plate 2, and upper and lower step portions 2a and 2b of the concave portion 2c are formed on the edge portions Ta and T of the magnetic tape T, respectively.
It is a positioning part for b. The facing distance between the step portions 2a and 2b of the guide plate 2 is formed to be slightly larger than the width dimension of the magnetic tape T, and the magnetic tape T travels between the step portions 2a and 2b. The magnetic tape T is guided so that the positional deviation between the track of the magnetic tape T and the gap of the magnetic detector is minimized.

[0004]

However, when the guide plate 2 shown in FIG. 5 is used, a slight gap δ between both edge portions Ta and Tb of the magnetic tape T and the step portions 2a and 2b.
Therefore, the magnetic tape T causes a movement error in the vertical direction in the figure by the gap δ (the size of the upper and lower 2δ). For example, when the magnetic tape T meanders in the vertical direction in the figure due to an error in the running drive system of the magnetic tape T, the positional deviation occurs between the gap on the front surface 1a and the track of the magnetic tape T.

In an ordinary analog tape recorder / reproducer such as a stereo tape recorder, since the positional deviation tolerance between the gap of the magnetic detector and the track of the magnetic tape is large to some extent, the value of δ should be made as small as possible. Further, by increasing the accuracy of the traveling drive system of the magnetic tape, the gap between the gap and the track does not become a problem.

Recently, however, it has been considered to use a magnetic head for digital signals, and in that case, the number of gaps of the magnetic detecting portion for digital signals is set to about 9 channels in a half area in the width direction of the tape. A scheme is being considered. For example, when a magnetic detecting portion of 9 channels is provided in a half region of the magnetic tape T in the width direction, the gap width (one track width of the magnetic tape) is about 50 to 200 μm. When a guide plate 2 as shown in FIG. 5 is used in such a magnetic head that requires high-accuracy positioning with respect to a track, the widthwise regulation of the magnetic tape T by the facing step portions 2a and 2b is used. However, it is impossible to position the track on the tape and the gap of the magnetic detecting portion in the order of several tens of μm.

Further, since the digital signal recorded on the magnetic tape is recorded at a short wavelength (for example, the wavelength is about 1 μm), the contact state between the magnetic tape and the gap of the magnetic detecting portion can be highly accurately determined. You have to do it.

The present invention solves the above-mentioned problems of the prior art. It is possible to position the gap of the magnetic detecting portion for digital signals and the track of the magnetic tape with high precision in the width direction of the magnetic tape, and moreover, digitally. It is an object of the present invention to provide a magnetic head capable of favorably contacting a gap of a signal magnetic detecting portion and a magnetic tape.

[0009]

A magnetic head according to the present invention is a magnetic head in which a magnetic detection portion for digital signals and a magnetic detection portion for analog signals are arranged side by side in a straight line direction. A positioning step for positioning the tape edge portion on the signal magnetic detection section side, and a guide section that is formed to be inclined on the analog signal detection section side and that applies a force to the magnetic tape in the direction of pressure contact with the positioning step. Is provided.

[0010]

In the above means, the magnetic detecting portion for the digital signal and the magnetic detecting portion for the analog signal are provided, and the positioning step is formed on the magnetic detecting portion side for the digital signal, and the positioning step is formed on the analog signal side. A guide portion is formed, and the inclination of the guide portion urges the magnetic tape toward the positioning step so that the magnetic tape can be accurately positioned on the magnetic detection portion for digital signals. Further, due to the inclination of the guide portion, the contact state between the gap of the magnetic detection portion for digital signals and the magnetic tape becomes stable.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a magnetic head according to the present invention. On the front surface 11a of the head body 11, a magnetic detection unit group H1 for digital signals and a magnetic detection unit group H2 for analog signals are provided side by side in the vertical direction in the figure. In the magnetic detection unit group H1 for digital signals, a 9-channel magnetic detection unit G1 is formed by a thin film head. The magnetic detector G1 is used for both recording and reproduction, for example, 8 channels are for recording / reproduction of a digital signal by 8-10 modulation, and the remaining 1 channel is for recording / reproduction of a subcode or the like. The width dimension of one magnetic detection unit G1 in the vertical direction in the drawing is about 50 to 200 μm.

The magnetic detection unit group H2 for analog signals has a two-channel magnetic detection unit G2. The 2-channel magnetic detector G2 is used exclusively for reproducing stereo analog signals. This analog magnetic detector G
Reference numeral 2 is composed of a thin film head like the magnetic detector G1 for digital signals. Alternatively, the head main body 11 is divided into upper and lower parts, one of the head main bodies is formed with a magnetic detection unit group H1 for digital signals by a thin film head, and the other head main body is made the same bulk head as for conventional analog signals. The head bodies may be joined and fixed.

As shown in FIG. 1, guide plates 12 are fixed to the left and right side surfaces of the head body 11. A recess 12c is formed in the front part of the guide plate 12. A positioning step 12a is formed on the upper end of the recess 12c in the figure, that is, on the side where the magnetic detection unit group H1 for digital signals is formed. Further, on the lower part of the recessed portion 12c in the drawing, that is, on the side where the magnetic detection unit group H2 for analog signals is formed, a guide portion 12b is formed which gradually inclines forward toward the step 12d in a concave curved surface. (See FIG. 2 for the side surface shape of the guide portion 12b).

Next, the tape running operation to the magnetic head will be described with reference to FIGS. Figure 2
2A is a plan view of the magnetic head showing a state in which the magnetic tape T is running while sliding on the front surface 11a of the magnetic head, FIG.
(B) is a side view thereof. This magnetic head is both digital and analog capable of recording / reproducing 9-channel digital signals and reproducing conventional 2-channel analog signals. That is, when a digital signal is used, recording / reproduction is performed by the magnetic detection unit group H1 on a half area in the width direction of the magnetic tape T, and when an analog signal is used, the width of the magnetic tape T is reduced. The magnetic detection unit group H2 performs the reproducing operation on the half area in the direction. Further, as shown by the arrow in FIG. 1, the magnetic head has a vertical position of 18
The rotation is switched so as to be replaced by 0 degree, whereby the automatic reverse operation of recording / reproducing a digital signal and the automatic reverse operation of reproducing an analog signal can be performed.

The magnetic tape is a recess 1 of a pair of guide plates 12.
Guided by 2c, it runs by sliding on the front surface 11a of the head body 11. Generally, a capstan and a pinch roller are located on the downstream side of the magnetic head, and the magnetic tape is run by the capstan. Therefore, the capstan and the pinch roller are located on the downstream side of the magnetic tape running with respect to the head body 11. The guide plate 12 mainly exhibits the guide function of the magnetic tape.

In the concave portion 12c of the guide plate 12, the guide portion 12b is provided so as to be inclined on the side where the magnetic detection unit group H2 for analog signals is provided. A biasing force (biasing force) in B direction of B) is applied, and the edge portion Ta of the magnetic tape T is pressed against the positioning step 12a. In this way, the edge portion Ta of the magnetic tape T is positioned and run,
The magnetic detection unit group H1 and the digital track of the magnetic head are positioned with high accuracy.

Further, the biasing force F exerted by the guide portion 12b presses a half area of the magnetic tape T in the width direction against the front surface 11a provided with the magnetic detection portion group H1 for digital signals. Thus, the contact state between the magnetic detection unit group H1 for digital signals and the magnetic tape T also becomes good. Therefore, recording / reproducing of a short wavelength digital signal can be performed with high accuracy. In the above embodiment, as shown in FIG. 2B, the guide plate 12
Although the guide portion 12b formed in the above has a concave curved surface shape, as shown in FIG. 3, the guide portion 12b may be an inclined surface which is linearly inclined.

Further, in the embodiment of FIG. 4, a positioning step 12a is formed on the guide plate 12, and the lower portion of the front surface 11a of the head body 11 (the portion where the magnetic detection unit group H2 for analog signals is formed) is forward. It inclines and protrudes, and this portion serves as a guide portion 11b. Even the guide portion 11b formed on the front surface 11a of the head body 11 can apply an urging force in the F direction to the magnetic tape T, and the edge portion Ta of the magnetic tape T is pressed against the positioning step 12a. The magnetic tape can be positioned in the width direction on the side of the magnetic detection unit group H1 for digital signals.

Further, a step projecting forward may be provided at the edge (upper end in the figure) on the digital side of the front surface 11a of the head body 11, and this step may be used as a substitute for the positioning step 12a of the guide plate 12. Further, in each of the above embodiments, the guide plate 12 is fixed to the side surface of the head body 11. However, the guide plate 12 may be fixed to a base that fixes the head body 11 (a base that rotates in the direction of the arrow in FIG. 1).

[0020]

As described above, according to the present invention, the magnetic detection portion for digital signals and the track of the magnetic tape are positioned, and the contact state between the magnetic detection portion for digital signals and the magnetic tape is improved. You will be able to keep.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic head according to the present invention,

2A and 2B show a state in which a magnetic tape is sliding on a magnetic head and running, (A) is a plan view, (B) is a side view,

FIG. 3 is a side view of a magnetic head according to another embodiment,

FIG. 4 is a side view of a magnetic head according to another embodiment,

FIG. 5 is a side view of a conventional magnetic head for analog signals,

[Explanation of reference numerals] 11 head main body 11a front surface of head main body 12 guide plate 12a positioning step 12b guide section H1 magnetic detection section group for digital signal H2 magnetic detection section group for analog signal T magnetic tape

Claims (1)

[Claims] 1. A magnetic head in which a magnetic detection unit for a digital signal and a magnetic detection unit for an analog signal are arranged side by side in a linear direction, and a tape edge portion on the magnetic detection unit side for a digital signal is provided. A magnetic step, which is provided with a positioning step for positioning the magnetic tape, and a guide section which is formed to be inclined on the side of the detection section for analog signals and which applies a force in a direction in which the magnetic tape is pressed against the positioning step. head.