JPH03242811A - Rotary magnetic head and assembly method thereof - Google Patents

Abstract

PURPOSE:To exactly and easily position and fix three head chips to prescribed positions by forming the above head device in such a manner that a central head base has the length varying in the radial direction of a rotary cylinder as compared with the head bases positioned on both sides thereof. CONSTITUTION:The 1st head base 5a which is positioned at the center and is fixed with a head chip at one end and the 2nd and 3rd head bases 5b, 5c which are positioned on both sides of the central head chip and are fixed with head chips at one end have the lengths varying in the radial direction of the rotary cylinder 2. Namely, the length of the head base 5a is shorter than the length of the head bases 5b, 5c and, therefore, the positioning and fixing of the head bases 5b, 5c after positioning and fixing of the head base 5a by utilizing this space are possible. The three head bases 5a to 5c are easily fixed to the rotary cylinder 2 by using positioning and fixing jigs.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a three-channel rotating magnetic head device used in a magnetic recording/reproducing device such as a video tape recorder (VTR) and a method for assembling the same.

Conventional technology In recent years, digital VTRs and high-definition television VCRs have significantly improved image quality compared to current television systems.
Demand for high-density recording and high-transmission rate recording and reproducing devices, such as TR, has been increasing. In the case of a general VTR, recording and reproduction are performed using a single magnetic head, but as the recording and reproduction frequency increases, it is no longer possible to use a single magnetic head.

Therefore, a method commonly used at present is to make the magnetic head multi-channel.

For example, in the 3-channel system, by dividing the frequency into three and assigning signal recording and reproduction to three magnetic heads, each magnetic head has a frequency band that is 1/3 of the original signal. The structure is as follows.

An example of a conventional rotary magnetic head device will be described below with reference to the drawings.

FIG. 7 is an enlarged view of the vicinity of the head of a conventional magnetic head device, FIG. 8 is a partial front view of FIG. 7, and FIG. 9 is a diagram showing an example of attachment of the head base.

In the figure, 1 is a magnetic tape that runs in the direction of arrow 1a. 2 is a rotating cylinder which rotates in the direction of arrow 2a. Head chips 3a to 3C are respectively fixed to one end of the head bases 5a to 5C, and their tips contact the magnetic tape 1 to record and reproduce signals. Furthermore, head gaps 4a to 4C are formed in the head chips 3a to 3c, respectively. Head bases 5a-5c are screws 6a-
6C to the rotating cylinder 2, respectively. Reference numeral 7a denotes a positioning and fixing jig used for positioning and fixing the head base 5a to the rotating cylinder 2.

In the above configuration, as the rotating cylinder 2 rotates,
When the magnetic tape 1 runs in the direction of the arrow 2a, the head chips 3a to 3C each scan the magnetic tape 1 to record and reproduce signals. Here, the head chips 38 to 3C are arranged on a staircase to protrude from the rotary cylinder 2 by a certain amount in order to contact the magnetic tape 1, and the head gap interval is set so that the tracks are arranged in H on the magnetic tape 1. It must be fixed at an angle θ that is an integral multiple of the H length. Therefore, the positions of the head chips 3a to 3c are accurately adjusted by using positioning fixtures to sandwich the head-1 bases 5a to 5C with the head chips 3a to 3C fixed to one end, respectively, and moving the head bases 5a to 5c. It needs to be fixed afterwards.

Therefore, we will explain how to attach the head base.

First, the head base 5a is held between both sides using the positioning fixture 7a. Then, after adjusting the head base 5a so that the tip of the head chip 3a protrudes a certain amount from the rotary cylinder 2 and the head gap 4a matches the installation reference line 10a, the head tip 3a is attached to the rotary cylinder 2 with a screw 6a. Fix it. Similarly, head bases 5b, 5c
The tips of the head chips 3b and 3c are also held together using a positioning fixture (not shown) to protrude a certain amount from the rotating cylinder 2, and the head gaps 4b and 4c are attached so that the reference line 10a is aligned with the rotating cylinder 2. Line 1 rotated counterclockwise by θ° and clockwise by θ° with respect to the center of
Head base 5b, 5c to match 0b, IOc
After adjusting by moving, fix it to the rotating cylinder 2 with screws 6b and 6c.

Problems to be Solved by the Invention However, the following problems arise in the above configuration.

According to the above-described rotating magnetic head device, since the lengths in the radial direction of the rotating cylinders 2 of the head bases 5a to 5C are the same, the rotating magnetic head units are sandwiched one by one from both sides using a positioning fixture. After adjusting the position of the head chip by moving the head base, it is very difficult to position and fix the head base.

For example, if the radial lengths of the rotary cylinders 2 of the head bases are the same, after positioning and fixing the central head/throat base 5a by sandwiching it from both sides using a positioning fixing jig,
When positioning and fixing the gutter base 5b located on the left side using a positioning and fixing jig, the gutter base 5b is in contact with the center head base 5a.
cannot be accurately positioned and fixed. Conversely, when positioning and fixing the left henod base 5b by sandwiching it from both sides using a positioning fixing jig, and then positioning the head base 5a located in the center using a positioning fixing jig, if the jig is There arises an inconvenience that the nod base 5a cannot be accurately positioned and fixed because it comes into contact with the head base 5b located at the top.

In view of the above-mentioned problems, the first and second inventions provide a head base shape that allows three head chips to be accurately and easily positioned and fixed at predetermined positions in a three-channel rotary head device. This provides a method for positioning and fixing.

Means for Solving the Problems In order to solve the above problems, a rotary magnetic head device according to a first aspect of the invention includes a three-channel type rotary magnetic head for simultaneously recording and reproducing a predetermined unit amount of video signals using three magnetic heads. The apparatus includes three head chips for recording and reproducing signals on a magnetic tape, a first henopod base to which the central head chip of the three head chips is fixed to one end, and both sides of the central head chip. A second head chip with a head chip located at one end fixed thereto. a third henodo base; and the first henodo base. Second. a rotating cylinder for fixing a third henode base, the first henode base and the second henode base; The third henode base is configured to have different lengths in the radial direction of the rotating cylinder.

Further, the rotary magnetic head device of the second invention includes three head chips for recording and reproducing signals on a magnetic tape;
a first head base having a head chip located on the left side of the two head chips fixed to one end; a second head base having a head chip located in the center fixed to one end;
a third head base having a head chip located on the right side fixed to one end; Second. a rotating cylinder for fixing the third head base; 2nd゜3rd
The head base has a length that differs stepwise in the radial direction of the rotating cylinder.

Effect With the above-described configuration, in the three-channel rotary magnetic head device, the first invention has a configuration in which the central head base has a different length in the radial direction of the rotary cylinder compared to the head bases located on both sides thereof. In addition, the second invention has a structure in which the three head bases have different lengths in stages in the radial direction of the rotating cylinder, so that the three head bases fixed to one end of the head base are
After positioning, move and adjust the three head bases using a positioning fixture so that the three head chips protrude a certain amount from the rotating cylinder and the distance between the head gaps becomes a predetermined value. Three head bases can be fixed to a rotating cylinder.

Embodiment Below, a rotating magnetic head device according to a first embodiment of the invention will be described with reference to the drawings. In these figures, the same components as those explained in FIGS. 7 to 9 are denoted by the same reference numerals, and the explanation thereof will be omitted.

FIG. 1 is a partially enlarged view of a rotating magnetic head device according to an embodiment of the first invention, and FIGS. 2(a), 2(b), and 2(c) are diagrams showing a method for positioning and fixing the head base.

In the above configuration, attachment of the head base will be explained.

First, in order to bring the head chip 3a into contact with the magnetic tape 1, the head chip 3a is made to protrude from the rotary cylinder 2 by a certain amount, and in order to fix the head chip 3a by aligning the center line 10a and the head gap 4a, one end of the head chip 3a is fixed. The head base 5a is held between both sides by the positioning fixture 7a,
After positioning the head base 5a by moving and adjusting it, it is fixed to the rotating cylinder 2 using screws 6a. Next, the head base 5b is held from both sides by the positioning fixture 7b, and the tip of the head chip 3b is made to protrude from the rotary cylinder 2 by a certain amount, and the distance from the head gap 4a is adjusted so that the tip of the head chip 3b is protruded from the rotary cylinder 2 by a certain amount, and in order to arrange H on the tape. For installation set to be an integral multiple of the H length, the head is placed at an angle θ°, and for installation of the head base 5a, the head is placed on a line 10b rotated counterclockwise from the reference line 10a with respect to the center of the rotating cylinder 2. In order to match and fix the gap 4b, the head base 5b
Using the positioning fixing jig 7b, hold the
Fix it to the rotating cylinder 2 using b.

Similarly, the head base 5c is also positioned and fixed to the rotary cylinder 2 after adjustment using the positioning fixture 7c.

In this way, since the length of the head base 5a in the radial direction of the rotating cylinder 2 is shorter than that of the head bases 5b and 5c,
After positioning and fixing the head base 5a using the space, it is possible to position and fix the head bases 5b and 5c.

Therefore, in order to fix the three head chips at predetermined positions, the three head bases can be easily fixed to the rotating cylinder using the positioning fixture.

In this example, the head bases were installed in the order of 5a, 5b, and 5c;
There is no problem with b.

Although the head bases 5b and 5c were positioned and fixed using positioning fixing jigs 7b and 7c by sandwiching them from the left and right sides in the figure, it is also possible to use jigs that sandwich them from above and below.

FIG. 3 is a partially enlarged view of a rotating magnetic head device in another embodiment of the first invention, and FIGS. 4(a), (b), (C
) shows how to position and fix the head base. In addition,
In these figures, the same components as those explained in FIGS. 7 to 9 are denoted by the same reference numerals, and the explanation thereof will be omitted.

In the above configuration, attachment of the head base will be explained.

First, the head chip 3b is made to protrude a certain amount from the rotary cylinder 2 in order to contact the magnetic tape l, and the distance from the head gap 4a is set to IJ in order to arrange H on the tape.
The mounting set to be an integral multiple of the length is by an angle θ, and the mounting of the head base 5a is set by a line 10 rotated counterclockwise with respect to the center of the rotating cylinder 2 from the reference line 10a.
In order to match and fix the head gap 4b to b,
The head base 5b is held between both sides by the positioning fixing jig 7b, and after positioning the head base 5b while moving and adjusting it, it is fixed to the rotary cylinder 2 using screws 6b.

Similarly to the head base 5b, the head base 5c is also positioned and fixed to the rotary cylinder 2 after adjustment using the positioning fixing jig 7c. And finally, head chip 3a
Using the positioning fixing jig 7a, move the head base 5a so that the tip of the head protrudes a certain amount from the rotating cylinder 2, and fix the head gap 4a so that it is aligned with the installation reference line 10a. After positioning while making adjustments, it is fixed to the rotating cylinder 2 using three screws 6a.

As described above, since the radial length of the rotating cylinder 2 of the head base 4a is longer than that of the head bases 4b and 4c,
After positioning and fixing the head bases 4b and 4c, it is possible to position and fix the head base 4a.

Therefore, in order to fix the three head chips in predetermined positions, the three head bases can be easily fixed to the rotating cylinder using the positioning fixture.

In this example, the head bases were installed in the order of 5b, 5c, and 5a;
There is no problem with a.

A rotary magnetic head device according to an embodiment of the second invention will be described below with reference to the drawings. In these figures, the same components as those explained in FIGS. 7 to 9 are denoted by the same reference numerals, and the explanation thereof will be omitted.

FIG. 6 is a partially enlarged view of a rotary magnetic head device according to a second embodiment of the invention, and FIGS. 7(a), (b), and (C) are diagrams showing a method for positioning and fixing the head base.

In the above configuration, when installing the head base, explain about.

First, the head chip 3b is made to protrude a certain amount from the rotary cylinder 2 in order to contact the magnetic tape l, and the distance from the head gap 4a is set to be an integral multiple of the H length in order to arrange H on the tape. For installation, only angle θ is required.
To install the head base 5a, use a positioning fixing jig 7b to align the head gap 4b with a line 10b rotated counterclockwise from the reference line 10a with respect to the center of the rotating cylinder 2. After positioning it by moving and adjusting the head base 5b, it is fixed to the rotary cylinder 2 using screws 6b. Next, the head base 5a is fixed so that the tip of the head chip 3a protrudes a certain amount from the rotating cylinder 2, and the head gap 4a is aligned with the mounting reference line 10a.
is held from both sides using the positioning fixture 7a, and after positioning while moving and adjusting the head base 5a, the head base 5a is fixed. Finally, using the positioning and fixing jig 7c, the head base 5c is positioned and fixed at a predetermined position in the same manner as the head base 5b.

As described above, since the lengths of the head bases 5a to 5C in the radial direction differ in stages, the head base 5b.

It is possible to position and fix in the order of 5a and 5c.

Therefore, in order to fix the three head chips in predetermined positions, the three head bases can be easily fixed to the rotating cylinder using the positioning fixture.

Note that in this embodiment, the head base 5b.

The length in the radial direction of the rotary cylinder 2 of 5a and 5c is increased in stages, and the positioning and fixing to the rotary cylinder 2 is adjusted to 5b,
I did head bases 5a and 5c in that order, but in reverse, I went to head bases 5b and 5.
The length in the radial direction of the rotary cylinder 2 of a and 5c is gradually reduced, and the positioning and fixing to the rotary cylinder 2 is
There is no problem even if steps a and 5b are performed in this order.

Further, although the head bases 5b and 5c are positioned and fixed by being sandwiched from the left and right sides in the figure using positioning fixing jigs 7b and 7c, it is also possible to use jigs that sandwich them from above and below.

Effects of the Invention As described above, according to the first invention, in a three-channel rotary magnetic head device that simultaneously records and reproduces a predetermined unit amount of video signals using three magnetic heads, it is possible to record and reproduce signals on a magnetic tape. a first head base to which the central head chip of the three head chips is fixed to one end; and a first head base to which the head chips located on both sides of the central head chip are fixed to one end. 2. a third head base; and the first head base. a rotary cylinder for fixing second and third head bases, and the first head base and the second and third head bases have different lengths in the radial direction of the rotary cylinder. The second invention also provides a first head base having three head chips for recording and reproducing signals on a magnetic tape, and a head chip located on the left side of the three head chips fixed to one end. , a second head base having a head chip located at the center position 9 fixed to one end, a third head base having a head chip located on the right side fixed to one end; a rotary cylinder for fixing the second and third head bases; Second.
By configuring the third head base to have lengths that differ stepwise in the radial direction of the rotating cylinder, a rotating cylinder with a head base in which three head chips are each fixed to one end, which was difficult in the past, is achieved. In order to fix the head chip in a predetermined position, the head base is held in place using a positioning fixing jig, and after positioning while moving and adjusting the head base, it is easily fixed to the rotating cylinder. be able to.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged view of a rotating magnetic head device according to a first embodiment of the invention, and FIGS. 2(a) and (c) are methods for positioning and fixing a head base in an embodiment of the first invention FIG. 3 is a 0-minute enlarged view of a rotating magnetic head device in another embodiment of the first invention, and FIGS. 4(a), (b), and (C) are An explanatory view showing a method of positioning and fixing the head base in the embodiment, FIG. 5 is a partially enlarged view of the rotating magnetic head device in the embodiment of the second invention, and FIGS. 6(a) and (b)
). (C) is an explanatory diagram showing a method of positioning and fixing the head base in the second embodiment, FIG. 7 is a partially enlarged view of a conventional rotating magnetic head device, and FIG. 8 is an enlarged front view of FIG. FIG. 9 is an explanatory diagram showing an example of positioning and fixing of a head base in a conventional rotary magnetic head device. l... Magnetic tape, 2... Rotating cylinder, 3a. 3b, 3c--head chip, 4a, 4b,
4c...Head gap, 5a, 5b, 5c.
...Head base, 7a, 7b, 7c...
・Head base positioning fixture.

Claims (5)

[Claims] (1) In a three-channel rotary magnetic head device that simultaneously records and reproduces a predetermined unit amount of video signals using three magnetic heads, 3 records and reproduces signals on a magnetic tape.
a first head base having a central head chip fixed to one end of the three head chips; a second head base having head chips located on both sides of the central head chip fixed to one end; a third head base; and a rotating cylinder that fixes the first, second, and third head bases; the first head base, and the second and third head bases are connected to the rotating cylinder. A rotating magnetic head device characterized by having a structure having different lengths in a radial direction. (2) Three head chips for recording and reproducing signals on magnetic tape, a first head base to which the central head chip of the three head chips is fixed to one end, and both sides of the central head chip. a rotary cylinder that fixes the first, second, and third head bases; and a rotating cylinder that fixes the first, second, and third head bases; 2. 3rd
The first head base is made smaller in the radial direction of the rotary cylinder than the head base of the rotary cylinder, and after the first head base is positioned and fixed to the rotary cylinder, the second and third head bases are positioned and fixed. A method of assembling a rotating magnetic head device. (3) Three head chips for recording and reproducing signals on magnetic tape, a first head base to which the central head chip of the three head chips is fixed to one end, and both sides of the central head chip. a rotary cylinder that fixes the first, second, and third head bases; and a rotating cylinder that fixes the first, second, and third head bases; 2. 3rd
The first head base is positioned and fixed after the second and third head bases are positioned and fixed to the rotating cylinder. A method of assembling a rotating magnetic head device. (4) In a three-channel rotary magnetic head device that simultaneously records and reproduces a predetermined unit amount of video signals using three magnetic heads, 3 records and reproduces signals on a magnetic tape.
A first head base has the head chip located on the left side of the three head chips fixed to one end, a second head base has the head chip located in the center fixed to one end, and the right side has two head chips. a third head base having a positioned head chip fixed to one end;
a rotating cylinder for fixing second and third head bases, and the first, second, and third head bases have lengths that differ stepwise in the radial direction of the rotating cylinder. A rotating magnetic head device characterized by: (5) Three head chips for recording and reproducing signals on magnetic tape, a first head base with the head chip located on the left side of the three head chips fixed to one end, and a head chip located in the center. a second head base fixed to one end; a third head base having a head chip located on the right side fixed to one end;
a rotary cylinder for fixing a head base, the first, second, and third head bases having lengths that are stepwise different in the radial direction of the rotary cylinder, and the first, second, and A method for assembling a rotary magnetic head device, characterized in that a third head base is positioned and fixed to the rotary cylinder from the side having the smallest length in the radial direction of the rotary cylinder.