JPS6013312A - Magnetic head device - Google Patents

Abstract

PURPOSE:To suppress the generation of break at the ridgeline part of a core and to prevent the abutted surface of a medium from the stack of dust such as magnetic powder by constituting two sides crossing with tracks of a magnetic head so as to be non-parallel each other. CONSTITUTION:Since respective sides 6a, 7a crossing with the tracks of at least one (preferably two) magnetic head out of the 1st and 2nd magnetic heads 1, 2 having different cores A6, B7 at their length along the extending direction 5 of the tracks are constituted so as to be non-parallel each other and the side 7a of the core B7 is formed approximately vertically to the width direction of the track, the generation of break is reduced at the ridgeline part 9 of the core B7. Preferably, a curved shape along the track extending direction 5 of the medium abutted surface 1a of the magnetic head is constituted so as to coincide with a circumference having its center 40 under a point corresponding to 70- 90% the length of the track extending direction from the outside of the core B7 and the ridgeline part 9 of the core B7 is made slidably contact with the tape, so that the stack of dust or the like is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (() Field of Industrial Application) The present invention relates to a magnetic head device used in video tape recorders (VTRs) and the like.

1crl Prior Art A normal helical scan VTR has multiple magnetic heads arranged at predetermined intervals in the circumferential direction! on magnetic tape (
：Video signals, etc. are recorded in order on the opened diagonal tracks (2).In order to improve the recording areal density, the structure is configured so that guard bands are not provided.C: Adjacent tracks This makes the azimuth of each one different.

In addition, in order to improve the image quality in the special reproduction mode (:), auxiliary heads are provided at two adjacent positions (2) with an azimuth different from that of the magnetic head (2). is a partial plan view of a magnetic head device having one pair of heads employed in such a VTR.

Fig. 1C: In Fig. 1C, (1) is the first magnetic head disposed on the entrance side C2 of the relatively traveling recording medium (tape, not shown), and (2) is the exit side (: the second magnetic head disposed Head, (
3) is a substrate that supports both of these magnetic heads.

The first magnetic head (1) and the second magnetic head (2) are symmetrical with respect to an imaginary line (4).Hereinafter, the first magnetic head (1) will be explained as a representative.

The first magnetic head (1) has cores A and B (61 (71) with different lengths along the track extension direction (5), and the outer surfaces (61 (71!L) of both cores are each other C
: Consists of two parallel Cs. Further, the curved shape of the medium contacting surface (1a) in the track extending direction coincides with the circumference having its center at a point directly below the working gap (8).

These occur when following the manufacturing process described below, and as a result, ■the outer surface (7a) and the medium contact surface (1&
) tends to cause chips (00) on the ridgeline (9), ■problems (: gaps are likely to occur between this ridgeline (9) and the tape running relative to it), and on the medium contact surface (1a) ( :
There is a drawback that dust such as magnetic powder accumulates and the reproduction output characteristics gradually deteriorate.

Next is the manufacturing process of the first magnetic head (1).
-Explain. Figure 2 shows one core wafer 〇υ.

Figure 3 shows the other core wafer. Each wafer is placed on two abutting surfaces (11a) and (12B);
A thin film such as 102 (not shown) is provided. It also has a groove 031 (141) that defines the track width + Tl.Furthermore, one wafer 011 (= is a direction perpendicular to the groove a3 (: a bonding material (glass rod) insertion groove (Is and a coil window groove) These two core wafers are aligned with the reference planes (11b) and (12b) and
Butt the glass rod as shown in the picture? ) are melted, solidified, and integrated. Thereafter, the core block 119 shown in FIG. 5 (2) is obtained by dividing along the broken line ζ in the figure.

Regarding this core block ■, its tape contact surface (19 &
), the working gap (center of the point QD just below 2I (2R) is polished, and after that, in order to form the above core B (7), the working gap c!Q1m parallel I: the part along the broken line (to)
C: Divide so as to remove. Then, we obtain Pro7ri (24) in Figure 6. Next, create a groove (c) with a depth that does not reach the depth end (upper edge of the coil window) C, leaving the tape contact width (5) (see Figure 7), and then open the dotted line (c) on this groove (c). The magnetic head (with no coil attached) shown in FIG. 8C is obtained by performing swiping along the lines 1 and 2) but with the necessary azimuth angle. The medium contact surface (1) of this magnetic head (1)
a) is constructed as shown in Fig. 9, and the ridgeline part (9)
This is because the cutter (II) on the top must have a cutting distance of C2, so a blade with a small number of blades must be used. Also, according to the radius attached to the upper surface of the medium contacting surface of the magnetic head as described above, when this magnetic head independently contacts tape C2, this ridge line part (9) is brought into sliding contact with tape C2. However, when another magnetic head (2) is placed close to it as shown in FIG. etc. are accumulating (secondary).

Furthermore, since the single corner portion (7C) of the core B (7) is formed at an acute angle, it acts to scrape off the magnetic powder and promotes the above-mentioned accumulation.

(C) Purpose of the Invention The present invention has been made in view of the above point C2, and the above ridgeline portion (
- It suppresses the occurrence of chips on the surface of the medium and body, and also secures sliding contact with the traveling medium at this ridgeline, thereby ensuring that the medium and body contact surface (
It is an object of the present invention to provide a magnetic head device that prevents dust such as magnetic powder from accumulating.

B)) Structure of the Invention The present invention provides cores A having different lengths along the track extending direction;
The first and second magnetic heads with B are connected in series along the track/7 and the shorter core B
a common substrate -1- (two adjacently arranged so that they face each other, one for each intersecting the tracks of at least one (preferably both) magnetic heads
The core A is characterized in that its surfaces are non-parallel to each other (-).Furthermore, the core A has side surfaces that intersect with the tracks (=parallel) to each other, and in the width direction of the track ( Azimuth angle (7° for β-type VTR)
, and that the side surface of core B opposite to the gap forming surface (one of the side surfaces of the magnetic head) is substantially perpendicular to the recording direction. This is one of its characteristics. These configurations are the first. The ridgeline of each core B of the second Ia air head F (the boundary line between the medium contact surface and the outer surface) The circumference (2) is configured to coincide with the circumference having its center below 70 to 90% of the length of the core B in the track extending direction, and the ridge line marking tape (-) of the core B is configured so as to be in sliding contact. It is characterized by preventing the accumulation of dust and the like in the area.

In addition, if it is less than 70%, the ridgeline part tends to fall away from the tape, while if it exceeds 90%, the contact relationship with the tape at the working gap part (2) may deteriorate.

Figure 11 is a partial plan view of one embodiment of the device of the present invention;
The figure is a partial front view.

The first magnetic head (1) is arranged on the entrance side (= disposed) in the tape running direction (5), and the second magnetic head (2) is disposed on the exit side. The first magnetic head (1) is installed as a pair with a third magnetic head (not shown) located 180 degrees apart in negative azimuth for normal recording and reproduction, while the second magnetic head (1) performs normal recording and reproduction. The magnetic head (2) has the same positive azimuth as the third magnetic head, and the special reproduction mode (according to the first and second magnetic heads (1) +21 is selectively used (the first, Working gap (s+) of the second magnetic head (llf2+
(The interval fPl between si is made as small as possible in order to avoid the need for time correction within the signal processing system or to make it extremely short (1). In this example, the NTSO method is used. The temperature is 1.25 I ((approximately 556 μm) at ℃.

1st. Since the second magnetic head (11f21 is symmetrical with respect to the virtual line (4), the first magnetic head (1) will be explained below as a representative. It is constructed by butting two cores with different lengths in the direction (5), namely a core (6) and a core B (7). It has a gap (8) and a coil window space that defines the lower end of this working gap.Nl) indicates this coil window C: a wound coil.It should be noted that core A (6) and core B (7)
The length and length of the sample are approximately 15 m and 0.2 mg, respectively. Each of the cores A and B is further provided with a notch C34 for defining the top width [T+] between the two opposing surfaces, and within this notch It is filled with a bonding material (glass) (351).

The tape contacting surface (1a) of the first magnetic helad (11) is rounded to align with the tape along the direction (5) (2), and extends in the direction (51) (36
) the width (37) is regulated. The radius is formed by using the ridge line (9) that separates the tape contact surface (1a) and the side surface (7a), or the running tape (=to ensure the heat of sliding contact), and the operating gap (8) is applied with an appropriate pressure to the running tape (:
In order to ensure engagement, the magnetic head (second magnetic head) (2) side (two points apart) facing the side surface (7a) by a distance of 70 to 90% of the above length 331) is attached. Directly below (two centers (11'Il) and the circumference l) are made to coincide with each other.

Next, the manufacturing process of this first magnetic head (hereinafter simply referred to as magnetic head) will be briefly explained.

(The second magnetic head is also manufactured in almost the same way except for the direction of slicing, which will be described later.) The steps up to the integration shown in FIG. The same goes for dividing blocks. The tape contacting surface of the divided block (4υ) is formed as shown in FIG. Formed fang 1, then the tape contact surface (width c3η of 411
A groove (43Y) is created to define the magnetic head chip (14), and then slicing is performed along the broken line (43) so that a predetermined azimuth angle is displayed.
obtain. Thereafter, a large number of steps were processed and formed on a jig (4! ) and core B (7).The total core thickness of this magnetic head (1) (4η
(See Figure 17) is 250 μm or less, so it is possible to use a cutter with a larger number than in the case of core BY molding in the conventional block state, and It is possible to significantly reduce the occurrence of chipping of the corresponding ridge line part (9).The method of attaching the magnetic head with the azimuth Z corresponding to this magnetic head to the substrate (3) (see Fig. 10) (2) is based on the conventional technique. You can use it as is.

(f) Effects of the Invention The present invention forms the core B as described above! In the state of the block, tc < Since we are trying to perform the process in the state of the chip, we can use a cutter with a large number, so the core B
It is possible to reduce the occurrence rate of chips at the ridgeline. Since the spacing between the two magnetic heads is constant over the entire width of the core, as shown in Figure 1 (2), there is no risk that one end of the core B will be abnormal (2) close to each other and encourage the accumulation of dust, etc. Since the tape does not exhibit a knife effect, there is less of a problem with magnetic particles being scraped off.Furthermore, since the ridge line section above and the operation gap section can always be in sliding contact with the magnetic tape, dust can be easily removed between the tape and the head. C: There is no risk of introducing or depositing spacing loss 'a' thick.

[Brief explanation of the drawing]

10 is a partial plan view of a conventional device. Figures 2 to 9 are explanatory diagrams of the manufacturing process of the magnetic head used in the device (-). Figure 5, Figure 6, and Figure 7 are perspective views of one block, Figure 8 is a perspective view of one chip, and Figure 9 shows the chip in its assembled state. It is a partially enlarged plan view of a surface. FIG. 10 is a schematic diagram showing the relationship between the apparatus of FIG. 1 and the running tape. FIG. 11 is a partial plan view of an ON embodiment of the apparatus of the present invention, and FIG. 12 is a partial front view of the same apparatus. Figures 13 to 17 are explanatory diagrams of the manufacturing process of the same device C: one type of magnetic and rad used.
The figure is a perspective view of the block, Figure 14 is a perspective view of the chip before processing core B, Figure 15 is an explanatory diagram of processing core B, Figure 16
0 is a perspective view of the chip, and FIG. 17 is a partially enlarged plan view of the tape contacting surface of the visiting chip. Explanation of main drawing numbers (617)...Core A, Core B, (1) (21.
...First and second magnetic heads, (6!L) (7a)...
Two non-parallel sides. Figure 2 Figure 8 Figure 6 Figure 8 Figure 0 Figure 0 JLO diagram

Claims (4)

[Claims] (1) Recording medium 1: Cores A and B, each having a sliding surface and having different lengths in the extending direction I-G of the track on the recording medium, are arranged in a coil between the opposing surfaces of both cores A and B. The window and the coil window C: Therefore, the first and second magnetic heads are configured to butt each other so that the lower end thereof has a defined working gap t, so that they are in series in the extending direction (= and the smaller core B is the track (-2 intersecting
A magnetic head device characterized in that two side surfaces are non-parallel to each other. (2) A patent claim characterized in that the track (two opposing side surfaces) of the core A are parallel and are inclined at an angle corresponding to two azimuth angles in the width direction of the track (1) Range No. 1 (Magnetic head device according to item 11). (3) The curved shape of the medium contacting surface of the first magnetic head in the track extending direction is set below a point from 70 to 90% of the length of the core B in the track extending direction from the outer surface of the core B. (:
A magnetic head device according to claim 1, characterized in that the magnetic head device is configured such that a circumference having a center coincides with the circumference. (4) The magnetic head device according to claim (2), wherein the inclination angles of the first and second magnetic heads are symmetrical with respect to an imaginary line in the track width direction.