JPS6276017A - Manufacture of video head - Google Patents

Abstract

PURPOSE:To wind an electric wire without hindrance by selecting the 1st glass and the 2nd glass so that the former has a higher melting point than that of the latter and impregnating the molten 1st glass into the track slot by the self-weight. CONSTITUTION:The softening point and the melting point of a track slot packing glass 15 are higher than those of a bonding glass 10. The bonding glass 10 is molten by heat treatment and a part is impregnated into a gap 14 to fill in the gap 14. Although the packing glass 15 is molten, it descends along the wall face of the track slot by self-weight in a crawling way and the glass has a viscosity to stay there when the wall face is intermitted. Then the molten packing glass 15 chokes the slot and the track slot and since the wall face to be crawled is intermitted at an opening 16, the glass 15 does not go to downward any more by the viscosity but stays at the opening 16. Thus, the glass 15 is packed in the track slot 9-1 and the slots 5-1a, 5-1b, but not invaded in the winding slot 4.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a method of manufacturing a video head.

A conventional video head is manufactured by fixing a video head depth formed by combining a pair of cores to a base and winding a wire around the video head dip. The legal viscosity and strength of the video head gap is determined by the video head dip, and the 'I' of the gap is determined by the video head dip. It is required that the A accuracy is high, but satisfactorily <E strong 1σ, and that the cores are well bonded to each other. General video heads are made of glass around GiV Tsubu.
: The structure is reinforced and the cores are joined together by glass.

Conventional video head dips, for example, have a C-shaped core in which winding fb'f and track grooves are formed and the track grooves are filled with glass, and a track groove is formed in the front part and a bonding glass groove is formed in the rear part. It is manufactured by butting an I-shaped core whose track groove and bonding glass groove are both filled with glass, heating it to melt the glass, and joining the C-shaped core and I-shaped core with the glass. Ta. The heating temperature is set to a temperature at which the glass can melt and bond both cores together. In this case, the glass filled in the bonding glass groove and the glass filled in the track groove were the same glass. Therefore, due to the heating described above, the glass in the track groove also melts to a viscosity comparable to that of the glass in the bonding glass groove, and some of the glass flows out of the track groove and enters the winding groove. ), which solidifies and blocks part of the winding groove, causing problems in the winding of the coil.

An object of the present invention is to provide a method for manufacturing a video head that solves the above seven problems.

Means for Solving the Problems The present invention provides a first glass that is filled into the track groove to reinforce the gap and join the cores together, and a second glass that joins the cores at a location opposite to the gap. The first glass is selected such that the former has a higher melting point than the latter, and the first glass is melted while placed on the core and penetrates into the track groove by nm.

Effect: Selecting the first glass and the second glass so that the former has a higher melting point than the latter, and allowing the molten first glass to enter the track groove by its own weight, increases the heating temperature. By setting the appropriate settings, the second glass can be sufficiently melted.
However, it is possible to set the viscosity of the first glass to such a value that it penetrates into the track groove but does not penetrate into the winding groove.

Embodiment Next, an embodiment of the method for manufacturing a video head according to the present invention will be described.

FIG. 5 shows a video head (head chip) 1 manufactured by the manufacturing method of the invention, and FIGS. 1(A) and 1(B) show the main steps of the manufacturing method of the invention.

FIG. 2(A) shows the block 2 for the C core, and FIG. 2(B) shows the block 3 for the I core. The C core block 2 includes a winding groove 4 having a trapezoidal cross section and a plurality of track grooves 5 in which the winding is performed.
-+, 5-2, 53... The track grooves 5-1, 52, 53... have butt protrusions 6-+ having a width Q1 corresponding to the gap width therebetween,
6-2, 6-3... are formed with equal bits ρ so as to form them relatively.

The 1-racks 5 + , 5-2 , 5-3 . . . have a ( )-shaped cross section and a cone-like shape, and are formed by so-called comb processing. Also, track, groove 5-+,
5-z, 5-3... cross the winding groove 4, and the groove portions 5-+a, 5-28.5 extend from the upper surface of the C-core block 2 to the winding groove 4. -38, and groove portions 5+b, 5-2b, and 5-3b below the winding groove 4. On the tip surface of each protruding protrusion 61.6-7°6-3..., there is a gear 1! Quartz glass, which is a tube material (softening point: 16
A quartz glass layer 7 is formed by sputtering at a temperature of 50° C. (melting point: 1800° C.) to a thickness of dimension q2 corresponding to the girdle length.

(2) The core block 3 has a bonding glass groove 8 having a trapezoidal cross section and a plurality of track grooves 9-+, 9-2, 9-3. The groove 8 is filled with a bonding glass 10 (softening point: 400° C., melting point: 500° C.). Track groove 9-
+, 9-2. , 9-3 is the track groove 5
+ + 5 21 J g...It is formed by comb processing at a constant pitch p, and the width of the gib V knob is 1.
Butt convex part 11 +, 1 with corresponding width dimension Q+ to the right
1-2, 11-3... are formed relatively. Each track fM9-+, 9-2.

9-3... has a U-shaped cross section and a cone-like shape, and has the same track width 1 as the above track width 5++5-2.5-3.
It's noise.

The above C core blocks 2 and 1] A block 3 are as follows:
As shown in FIGS. 3(A) and 3(B), the convex portions 6-1, 62, 63, etc. of both core blocks.

11 1.11-2, 11 3... are matched and fixed, and the first block assembly 13 is 1c.
1-ru. The convex portions abut against each other with the quartz glass layer 7 in between, and this portion forms a gap 12. Track groove 5
-+, 5 2, 5-3..., 9-1.9 2.
9 3... are facing each other, and the new surface of the track groove has an oval shape. Furthermore, due to the presence of the quartz glass layer 7, the block 2.
3 is slightly inclined, and there is a small ■-shaped gap 1 between the two.
4 is formed.

Next, as shown in FIGS. 1(Δ) and 1(B), the first block assembly 13 is fixed in a position with the gap 12 facing upward, and the first block assembly 13 is placed in a position along the gap 12 on the F plane [ 41 pieces of glass 15 for filling track grooves with one dot shape! Affix and fix. This glass 15 has a softening point of 500°C and a melting point of 60°C.
0°C, and the softening point and melting point are respectively 10
0'c high.

Next, the first block assembly 13 on which the glass 15 is placed and fixed is placed in a heating furnace, and heated at 700°C ± 2°C for 30 minutes, for example.
==Perform heat treatment for 10 minutes.

Due to this thermal embedding, the bonding glass 10 and the filling glass 15 are both melted. As shown in FIG. The gap 14 is not filled. Although the filling glass 15 is melted, due to the above-mentioned melting point, the viscosity t of the molten glass is higher than the viscosity of the molten bonding glass 10, and it is more easily attached to the wall surface of the track groove. When the wall surface stops, the molten filling glass 15 slowly descends as if crawling along the wall, and becomes viscous enough to remain at that location.As a result, as shown in FIG. 5 +8.5 za, 5-38...
・and track grooves 9-+, 9 2.9 3... and spread over the entire cross-sectional area of the grooves and track grooves, blocking the grooves and track vortices, and creeping up the respective wall surfaces (as in this state) It's slowly descending. Although the lath 1.5 has entered the L-rack 9-1, it moves to a midway position in the track groove 9-I as shown by the arrow, fills a part of the track groove 9-1, and remains there.

The glass 15 that has entered the 1G i, 1M section 5-1a is indicated by the arrow. t'J: Filling the sea urchin groove 5-1a) Groove 5
- The glass 15 descends to the opening 16 with respect to the winding groove 4 of 18, and when it reaches the opening 16, the glass 15 stops moving downwards due to its viscosity. It stays at the opening 16 without moving. This results in
The glass 15 does not enter the winding groove 4 through the groove 5-1a.

Furthermore, by setting the heat treatment time as described above, intrusion of the glass 15 into the winding 4 from the track groove 9-1 side is also prevented. To this, J stiffness, glass 15 is 1
~ rack i +%9 + + ri4 part 5 + a
+ 5-1b is filled, so that it does not enter into the winding) 144.

When heating is stopped, glass 10.15 solidifies and blocks 2
．． 3 is (Fig. 4) in which the J2 nI side is joined to 1 mainly by glass 10, the gitop 12 side is joined by glass 15, and the periphery of gi 1/tub 12 is reinforced by glass 15 ( △>, second block assembly 1 shown in (B)
7 and 4. 'ru.

Note that since the softening point of the quartz glass layer 7 is considerably higher than the temperature of the heat treatment described above, the heat treatment does not soften the quartz glass layer 7 at all, and the dimensions of the gap 12 do not change at all even after the heat treatment.

Next, the second block assembly 17 is cut along the cutting line 18 to remove the lower part (rear part), and then sliced along the cutting line 19 to form the video head disk as shown in FIG. 1q is reduced. The video rad chip 1 is an IM JFj in which a C core 20 and a (2) core 21 are joined by glasses 10 and 15, and both sides of the 4' top 12 are reinforced with glasses 15. The video head is completed by fixing the RAD chip 1 to the base L and winding the electric wire through the winding groove 4. For winding) 1 to 4
Since the area is not blocked, the wire winding work can be carried out without any problems.

Next, the main parts of another embodiment of the manufacturing method according to the present invention will be described with reference to FIGS. 6 and 7.

Figure 6 and Figure 7 are people Figure 1 (B) and Figure 4 (B)
This is a diagram corresponding to , and corresponding parts are given the same reference numerals.

As shown in Figure 6, ? In addition to a rod-shaped glass 15 fixed to the upper surface of the A1 block assembly 13, a rod-shaped glass 22 shown by crosshatching is inserted into the winding b14. and f2 is placed.

Glass 23 has a softening point of 400° C. and a melting point of 500° C., and has a lower softening point and melting point than glass 15. With the glass 15 and 22 placed in this manner, heat treatment is performed as described above. This allows glass 10.1
5° 22 melts and solidifies by penetrating into the grooves and gaps as shown in FIG. is reinforced by glass 15, and furthermore, unlike the above, the lower part of the winding ring 4 is reinforced by glass 22, and the blocks 2 and 3 are joined together. In particular, the glass 22 penetrates into the groove portion 5-1b and the lower part of the track groove 9-1 and solidifies, thereby strengthening the bond between the blocks 2 and 3.

Since the winding ring 4 is not blocked by glass, the wire winding work can be carried out without any problem.

Effects of the Invention As described above, according to the video head manufacturing method of the present invention, a pair of abutted core blocks are used as the first glass to be filled in the track groove on the gap side, and the side opposite to the gap is used as the first glass filled in the track groove on the gap side. Use a glass that has a higher melting point than the second glass to be bonded, and place the first glass on the top of the gap so that when it is melted at j4, it can enter the track groove with its own hair. Since the core blocks are heated to a viscosity of QB that can barely penetrate into the interior, the core blocks are sufficiently firmly bonded by the first glass and the second glass, and the gap is closed by the first glass. In addition to providing reinforcement, it effectively restricts the first glass from entering the winding groove, ensuring perfect winding to the end, and manufacturing a video head in which the wire can be wound without any trouble. It has the feature of obtaining

[Brief explanation of drawings]

FIG. 1(A) is a plan view of the main steps of an embodiment of the video head manufacturing method according to the present invention, and FIG. 1(B) is the same diagram (
A) Cross-sectional view along the middle IB-B-IB line, Fig. 2 (A
) and (B) are perspective views showing the C core block and I core block facing each other, FIG. 3 (△) is a plan view of both blocks butted against each other, and FIG. 3 (B) is a Same figure (
Δ) Middle II B-IV
FIG. 5, a cross-sectional view taken along line B, shows one of the video head (video head chip) manufactured by the manufacturing method of the present invention.
The perspective view of the example, FIG. 6, and FIG. 7 are views showing essential parts of another embodiment of the manufacturing method of the present invention. 1...Video head (video head chip), 2...
・Block for C core, 3...Block for I core, 4・
・・Winding is perfect, 5-1~5-3.9-+~9-3...
Track 11/I, 5-1a to 5-3a, 5-Ib to 5
-3b... Part 111, 6-1 ~6
-3.11-t ~ 1 1-3... Butt convex portion, 7... Quartz glass layer, 8... d4 for bonding glass
．． 10... Bonding glass, 12... Gap, 13
...first block assembly, 14...gap, 15.
... Glass for full truck filling, 16... Opening, 17.
...Second block assembly, 18.19... Cutting line,
20...C core, 21...I core, 22...Glass. Patent applicant Mitsumi Electric Co., Ltd. Patent attorney Kaneyuki Matsuura ::1
, -12 No □ Figure 4 NS6 Figure 5 □ Figure 7

Claims (1)

[Claims] a plurality of first track grooves, a plurality of first abutting convex portions formed relative to the first track grooves, and a winding groove in which a winding wire is applied; A first core block having a gap material adhered to a thickness corresponding to the gap length on the distal end surface of the butting convex portion, a plurality of second track grooves, and a plurality of second track grooves formed relatively to each other. and a second core block having a plurality of second abutting convex portions and a second glass embedded in the glass groove, the abutting convex portions of the two core blocks are aligned with each other to form a gap. A first glass having a higher melting point than the second glass is placed on the upper surface of the gap with the gap as the upper side, and although the second glass is sufficiently melted, the first glass is The second glass joins the first and second core blocks by heating to a temperature at which the viscosity is such that it can enter the first and second track grooves under its own weight, and the second glass joins the first and second core blocks. Glass fills the first and second track grooves without entering the winding groove to join the first and second core blocks and to reinforce the gap. A method of manufacturing a video head.