JPH0584568B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention has a dedicated magnetic head for each of the luminance signal and chrominance signal in order to separate and record/reproduce a video signal into a luminance signal and a chrominance signal on a magnetic tape. Regarding tape guide cylinders.

2. Description of the Related Art A conventional tape guide cylinder magnetic recording/reproducing apparatus of this type has a configuration as shown in FIG. 4, as disclosed in, for example, Japanese Patent Application Laid-open No. 75086/1986. That is, in a video signal magnetic recording/reproducing device (VTR), the video signal is separated into a luminance signal and a color signal for the purpose of recording and reproducing high-quality images, and a dedicated magnetic head is provided for each. As shown in Figure c, each dedicated head is arranged at a predetermined distance in the direction of the magnetic tape, and two sets of magnetic heads 40 are arranged for each field.
There are a, 41a and 40b, 41b, 40a, 40
b is the color signal 41a, 41b is the luminance signal recording/
It is used as a head for playback. As shown in FIG. 4a, these magnetic heads are fixed via head bases 36 to the upper and lower surfaces of a head support 33 that rotates integrally with a shaft 34 supported by bearing means provided in a lower cylinder 32. ing. The magnetic heads 40a, 40b, 41a, and 41b protrude into the gap a defined by the lower cylinder 32 and the upper cylinder 31 connected by the connecting member 35, and at the same time, the outer circumferential surface of the head support 33 also extends over the entire gap a. It has a prominent structure all the way around. As shown in FIG. 4B, on the magnetic tape running helically around the outer circumference of the cylinder, a chrominance signal track 50 is recorded on the upper side and a luminance signal track 51 is recorded on the lower side. become.

Furthermore, although the method of fixing the magnetic head is not clearly shown in the above-mentioned conventional example, for example,
Publication No. 79512 discloses a conventional example as shown in FIG. 5, in which a head base 52 to which a head chip 51 is glued is fixed to a rotating cylinder 50 with screws 53, but two head bases 52 are used. , In order to make these common, they are made symmetrical with respect to a line connecting the head chip 51 and the axis.

Problems to be Solved by the Invention However, with the above configuration, especially when two magnetic heads are fixed axially opposite both sides of the head support 33, the distance from the outer peripheral surface of the cylinder of each head is Because of the need to independently adjust the amount of protrusion and inclination, the shape of the head base may differ for each magnetic head, a complex shape may be required, the thickness of the head support 33 may be limited, or it may be difficult to make adjustments. This has the problem of requiring an extremely large amount of time for processing, resulting in increases in processing costs and assembly/adjustment costs.

In view of the above-mentioned problems, the present invention provides a tape guide cylinder which has a simple structure and records/reproduces luminance signals and color signals by separating them with high accuracy.

Means for Solving the Problems In order to solve the above problems, the tape guide cylinder of the present invention includes at least one set of two magnetic heads that record video signals by separating them into luminance signals and color signals. The rotary cylinder has two magnetic heads and a rotary cylinder for guiding the magnetic tape, and the rotary cylinder has two axially opposed surfaces for mounting the two magnetic heads at a predetermined distance in the axial direction. The magnetic head is formed by fixing a head chip forming a head gap to a head base, and the head base has an asymmetrical shape with respect to a line connecting the head gap of the head chip and the rotation axis, and The head bases of each magnetic head are constructed to have the same shape.

Effects According to the present invention, the magnetic heads can all use the same head base with the above-described configuration, and the positions of the two magnetic heads provided facing the head support can be adjusted independently with a simple configuration. This makes it possible to obtain a tape guide cylinder with low cost and high precision.

Embodiment A tape guide cylinder according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a partial cross-sectional view of a tape guide cylinder which is an important part of the present invention. Reference numeral 1 denotes a rotating cylinder that guides a magnetic tape along its outer peripheral surface. A fixed cylinder 18 has a guide portion 21 on its outer periphery for guiding the magnetic tape in a helical shape, and is fixed to a substrate (not shown). 17 is a shaft rotatably supported by bearing means 19 provided on the fixed cylinder 18, and 20 is a disk fixed to the shaft 17. The rotary cylinder 1 is fixed to this disk 20. Fig. 1 is a perspective view of the rotating cylinder section, and 10a and 10b (not shown in Fig. 1, but installed at a position 180° opposite to 10a) are for recording and reproducing color signals provided for each field. It is made of a magnetic thin plate made of ferrite or the like with a predetermined head gap formed with a head chip for use with the head, and is adhesively fixed to the head bases 4a and 4b, respectively. 11a,
Numeral 11b is a head chip for recording and reproducing luminance signals, which is similarly provided for each field, and is adhesively fixed to head bases 3a and 3b, respectively, in the same way as head chips 10a and 10b for color signals. Head bases 3a, 3b, 4a, 4b head tips 10a, 1
Since the fields 0b, 11a, and 11b have the same configuration, the following description will focus on the head bases 3a, 4a and head chips 10a, 11a, which correspond to one field. The head base 3a is fixed to one side 2a of the head support 2 with screws 7a. On the other hand, the head base 4a is fixed to a surface 2b of the head support 2, which is parallel to the surface 2a and with a predetermined gap in the axial direction, by screws 8a. Further, this head support 2 has a surface 2a and a surface 2b.
Since it is formed so that there is no part protruding in the axial direction, the thickness dimension, parallelism and surface phase of the surfaces 2a and 2b can be easily processed with high precision by wrapping processing or the like. Head base 3a, 4
a is a head chip 11a, 1 as shown in FIG.
The head base 3a has an asymmetrical shape with one side protruding from the line connecting each headcap 0a and the rotation axis of the rotary cylinder 1, but as described above, the head base 3a,
4a has the same shape, and the head chips 11a, 1
The surface to which the head 0a is bonded and joined to the head support 2 is configured to be the same for each head base. In other words, it is necessary to precisely machine only one surface of the head base, and moreover, only the same surface of each head base. Further, the head support 2 is made of the same material as the rotating cylinder 1,
A surface 2c sandwiched between surfaces 2a and 2b is an opening 12a, 12b provided on the outer peripheral surface of the rotating cylinder 1.
Head chips 10a, 11a and 10b, 1
It stands out and is sandwiched between 1b. The diameter thereof is set to be equal to or slightly smaller than the outer diameter of the rotating cylinder 1, and the width in the circumferential direction is set to be slightly smaller than the width of the openings 12a and 12b. Therefore, the running state of the magnetic tape, which tends to be unstable near the magnetic head, is maintained stably, and signals are stably recorded and reproduced. Furthermore, in this embodiment, the head gaps of the luminance signal head chips 11a, 11b and the corresponding color signal head chips 10a, 10b are aligned in the axial direction as in the conventional example shown in FIG. The magnetic tape and head chips 10a, 11a, 10b, 1 are configured to obtain a track pattern as shown in FIG.
In order to ensure good contact between the head chips 1b and recording and reproducing signals, it is necessary to adjust the amount of protrusion of each head chip from the outer peripheral surface of the rotary cylinder 1, the axial tilt, etc. with high precision. There is. For this reason, the head bases 3a, 4a have cutouts 6a, 9a and setscrews 5a, 13a, respectively.
is screwed on. That is, the head base 3a is fitted with a screw 7a by a jig that engages with a notch 6a and rotates around a screw hole provided in the head support 2 into which a screw 8a for fixing the head base 4a is screwed.
Since the head tip 11a can be moved slightly around the center, the amount of protrusion of the head tip 11a can be easily adjusted. The tilting of the head can be adjusted by turning the setscrew 5a, bringing the tip of the head into contact with the head support 2, and bending the head base 3a. Since this adjustment cannot give a large displacement, it is used for fine adjustment at the final stage. These adjustments are made in the same way for each head base, and the head support 2 on which the magnetic head is mounted is fitted with the center hole 14 into the boss 15 provided on the rotary cylinder 2 concentrically with the rotation axis. Perform positioning with respect to the center, and
b is fixed to the rotating cylinder 1 by bringing the rotating cylinder 1 into close contact with the mounting surface and suppressing the surface runout. On the other hand, the rotating cylinder 1 has a head base 4a.
A through hole 16 is provided corresponding to the position of the setscrew 13a screwed into the head base 4a, so that even after the head support 2 is fixed to the rotating cylinder 1, the head base 4a
It is now possible to fine-tune the tilt of the camera. Although not shown, the head base 4b can also be finely adjusted.

Effects of the Invention As described below, the present invention rotates the magnetic tape by a predetermined angle, has a guide part that guides the magnetic tape in a helical shape, has a fixed part fixed to the device, and separates the video signal into a luminance signal and a color signal. A set of two magnetic heads for recording/reproduction is provided, and a rotating section has at least one set of magnetic heads mounted thereon, and this rotating section rotates the two magnetic heads in a predetermined direction in the axial direction. The magnetic head is provided with a head support having two axially opposed surfaces for installation at a distance, and the magnetic head is formed by fixing a head chip forming a head gap to a head base, and the head base is connected to the head gap of the head chip and a rotating shaft. The head bases of the two magnetic heads have the same shape, so even if there are two or more sets of magnetic heads, the same head base can be used. Since the shape is asymmetrical, the wrapping surface and the adhesion surface of the head tip can be clearly distinguished during wrapping of the head base, greatly improving work efficiency. Furthermore, since the shapes are asymmetrical, even if the head gaps of the luminance signal head and the color signal head are perfectly aligned in the axial direction as in the embodiment, space for fixing the head base and installation space for the adjustment jig can be secured, allowing individual The position of each magnetic head can be easily adjusted independently. Therefore, even if the number of magnetic heads increases by recording/reproducing the signals separately, it is possible to suppress the increase in processing cost, assembly/adjustment cost, and obtain a high-precision tape guide cylinder, which is useful for practical use. The value is extremely great.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a rotating cylinder section of a tape guide cylinder used in a magnetic recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of the same rotating cylinder section, and FIG. 3 is a main part of the tape guide cylinder. 4a is a sectional view of a tape guide cylinder of a conventional magnetic recording/reproducing device, FIG. 4b is a schematic diagram of a track pattern recorded on a magnetic tape, and FIG. 4c is a diagram of a magnetic head arrangement. The schematic diagram, FIG. 5, is a perspective view of a rotary cylinder section in another conventional example. 1...Rotating cylinder, 2...Head support,
3a, 3b, 4a, 4b...Head base, 10
a, 10b, 11a, 11b...head chip,
12a, 12b...opening, 18...fixed cylinder.

Claims (1)

[Claims] 1. A rotating device that winds a magnetic tape at a predetermined angle, has a guide portion that guides it in a helical shape, a fixed portion that is fixed to the substrate of the device, and at least one set of two magnetic heads. The rotating section is configured to separate the video signal into a luminance signal and a color signal and record/reproduce it using the set of magnetic heads, and the rotating section is configured to separate the video signal into a luminance signal and a color signal and record/reproduce it using the set of magnetic heads. The head support has a first surface on which a magnetic head is attached, and a second surface opposite to the first surface in the rotational axis direction and on which a second magnetic head is attached, and each of the magnetic heads has a second surface. The head chip is formed by fixing a head chip made of a magnetic material forming a predetermined head gap to a head base. A tape guide cylinder characterized in that the head bases of the second magnetic heads have the same shape.