JPS63181101A - Tape guide drum device - Google Patents

Abstract

PURPOSE:To cope with multi-channel without large-sized guide drum by combining a torus rotary transformer formed along a radial plane and a cylindrical rotary transformer formed in an axial direction. CONSTITUTION:The rotary transformer 5 is constituted by combining the torus rotary transformer 12 in a torus shape in a radial direction and the cylindrical rotary transformer formed cylindrically in the axial direction. The rotary transformer 5 sends signals of in total 8 channels for each four channels of video and audio signals by combining the torus rotary transformer 12 and the cylindrical rotary transformer 14. Since said rotary transformer 5 is provided in a limited space in the tape guide drum device, the multi-channel application is applied without large-sized rotary drum 2 and stationary drum 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape guide drum device, and more particularly to a tape guide configured to support multi-channel magnetic recording/reproduction using a rotating drum having a plurality of magnetic heads. Regarding a drum device.

BACKGROUND OF THE INVENTION For example, in a magnetic recording/reproducing device having a tape guide drum device such as a video tape recorder, it has been considered to miniaturize the device without changing the recording pattern of the conventional magnetic recording method. There is. Further, so-called camera-integrated video tape recorders are being developed to increase the number of magnetic heads and provide multi-channel recording to provide compatibility in recording patterns and to make the device smaller and lighter. That is, in the above-mentioned device,
In order to reduce the size of the magnetic tape, the magnetic tape is placed on the outer periphery of the guide drum.
It is being considered to create multiple channels by winding the tape over a 0° angle and installing four magnetic heads at 90'' intervals on a rotating drum.In addition, in this type of tape guide drum device, the rotating drum and fixed A rotary transformer having a coil for transmitting signals from the magnetic head is provided between the drum and the rotary transformer. A pair of rotary transformers are provided on the upper surface of the rigid drum, and a pair of rotary transformers are used.A ring-shaped rotary transformer with a coil facing each other, and a cylindrical outer peripheral side provided on the rotating drum. There is a cylindrical rotary transformer consisting of a low retransformer half and an inner cylindrical rotary transformer half provided on a fixed drum.

Problems to be Solved by the Invention However, in the above-described tape guide drum device, if the number of magnetic heads is increased and the number of channels is increased, the number of coils of the rotary transformer will also increase accordingly. Therefore,
Conventional tape guide drum devices have a problem in that when an annular rotary transformer is used, the outer diameter of the rotary transformer increases due to the increase in coils due to multi-channel design, resulting in an increase in the size of the rotating drum and fixed drum. Additionally, in tape guide drum devices that use a cylindrical rotary transformer, there is a problem in that the height of the rotary transformer increases due to the increase in coils, and the height of the valve fixed drum and rotating drum also increases. . Therefore, with the conventional tape guide drum device, there is a problem that it is difficult to increase the number of channels within a limited space, and the device cannot be miniaturized.

Therefore, the present invention has solved the above problems. The purpose of this invention is to provide a tape guide drum device.

Means and Effects for Solving the Problems The present invention provides the above-mentioned tape guide drum device, in which the rotary transformer includes an annular rotary transformer formed in an annular shape along a radial plane and a cylindrical shape along an axial direction. The guide drum is combined with a cylindrical rotary transformer to accommodate multiple channels without increasing the size of the guide drum.

Embodiment FIGS. 1 and 2 show an embodiment of the tape guide drum device according to the present invention. In both figures, the tape guide drum device 1 generally consists of a rotating drum 2, a fixed drum 4 supporting the rotating drum 20 and the rotating shaft 3, and a rotary transformer 5 disposed between the rotating drum 2 and the fixed drum 4. It is configured.

Since this tape guide drum device 1 is incorporated into a so-called camera-integrated video tape recorder, the outer diameters of the rotary drum 2 and fixed drum 4 are reduced.

Four magnetic heads 6 to 9 are arranged on the lower surface of the rotating drum 2 at 90° intervals. Each magnetic head 6-9 is a video head 68-9a and an audio head 6b.
9b, and is fixed to the rotating drum 2 via a head support 10. The video heads 6a to 9a are of a type that can be used both in a standard mode and in a long-time recording mode in which recording is performed for a longer time than in the standard mode. Therefore, the number of channels of magnetic heads 6 to 9 is as follows: video heads 6a to 9a and audio heads 6 to 9.
b to 9b totaling 8 channels.

In addition, although the outer diameter dimensions of the rotating drum 2 and fixed drum 4 are smaller than those of the standardized standard, the tape winding angle is adjusted so that the recording patterns recorded on the magnetic tape are compatible. At 270 degrees, it is set larger than the standard one. Note that in the recording mode, the magnetic head 6 is
During the 70° scan, the next magnetic head 7.8 also starts scanning, but as soon as the scanning of the magnetic head 6 is completed, the recording current is supplied to the next magnetic head 7 with some overlap. Similarly, the magnetic head 6°7.8.
By supplying recording current in the order of 9, magnetic recording/reproduction is performed in a standardized standard recording pattern.

Eight channels of signals from each magnetic head 6 to 9 are supplied to a preamplifier 11 via a rotary transformer 5. Here, with reference to Figure 3.4.5, the rotary transformer 5
I will explain about it.

As shown in FIGS. 3(A) and (B), the rotary transformer 5
The transformer is formed by combining an annular rotary transformer 12 formed into an annular shape along the radial direction and a cylindrical rotary transformer 14 formed into a cylindrical shape along the axial direction.

As shown in FIGS. 4(A) and 4(B), the annular rotary transformer 12 includes a rotating rotary transformer half 12A and a stationary rotary transformer half 12B facing each other. There are four concentric circles on the bottom surface of the rotating side rotary transformer half body 12A.
12a to 12d are provided. In addition, the above FIW 12a~
Concentric grooves 12e to 12h opposite to 12d are provided. Inside these grooves 12a to 12h are coils 138 to 13.
h is buried. In addition, the lower surface of the rotating side rotary transformer half body 12A and the fixed side rotary transformer half body 12B
Four grooves 12Δ+ and 12B+ are formed radially on the upper surface of each of the coils, and lead wires (not shown) connected to each of the coils 13a to 13h are inserted into the grooves 112A+ and 12B+.

Further, as shown in FIGS. 5(Δ) and (B), the cylindrical rotary transformer 14 includes the outer rotary 1 to the lance half 14A.
and an inner rotary transformer half 143. On the inner periphery of the outer rotary transformer half-open 14A and on the outer periphery of the inner rotary transformer half-closed 14B, there are four holes 14a, . coil 15a
~15h is buried. Also, 14A1.14B+
are grooves formed in the axial direction, and each coil 15a is inserted into the groove.
~Lead connected to 15h? , il (not shown) are wired.

As shown in FIG. 3, the annular rotary transformer 12 and the cylindrical rotary transformer 14 are integrally bonded to the inner periphery of the center hole 12A2 of the rotary transformer half-opened on the rotating side 12A and the lower end of the outer circumference of the outer rotary transformer half-opened 14A. , center hole 12B of fixed side rotary transformer half-open 12B
The lower end of the outer periphery of the inner rotary transformer half-rest 14B is adhered to the second inner part to form a rotation-side half-shut and a stationary-side half-shut, respectively, each having an L-shaped cross section.

Moreover, four terminals 16 connected to each of the rotating side coils 13a to 13d and 15a to 15d are provided on the upper part of the inner rotary transformer half-closed 14A. Each fixed side coil 13 is installed on the bottom of the fixed side rotary transformer half-closed 12B.
4 terminals 1 connected to e~13h, 15e~15h
7 is a provision.

As shown in FIG. 1, the rotating side rotary transformer half 12A of the rotary transformer 5 constructed as described above is adhered to the lower surface 18a of the flywheel 18 fixed to the rotating drum 2. In addition, fixed side rotary transformer half-off 1
2B is glued to the convex portion 4a of the fixed drum 4. Rotating side rotary transformer half-off 12A and outer circumferential side rotary transformer half-off 14△ are fixed side rotary transformer half-off 12, respectively.
B.

It closely faces the inner rotary transformer half-closed 14B with a minute gap of several tens of microns therebetween. Further, the flywheel 18 is fitted and fixed to the upper end of the rotating shaft 3. Therefore, during magnetic recording/reproduction, the rotation side rotary transformer half 12A and the outer peripheral side rotary transformer half 14A rotate integrally with the rotary drum 2.

Note that the terminal 16 has four bins 16a, and the second
As shown in the figure, each bin 16a of the terminal 16 is attached to the rotating drum 2.
The video heads 6a to 9a and the audio head 6b are connected through the pattern 19a of the substrate 19 attached to the top of the
~9b is connected to the relay bin 20.

Each of the coils 13a to 13d on the rotating side is a pin 16a of the terminal 16 and a pattern 19a of the substrate 19, respectively.

It is connected to video heads 68 to 9a via relay pins 20. Further, the coils 15a to 15d are similarly connected to the audio heads 6b to 9b.

Further, the terminal 17 on the fixed side has four bins 17a, and each bin 17a of the terminal 17 is connected to the preamplifier 11 via a lead wire. Therefore, each of the coils 13e to 13h and 15e to 15h on the fixed side is connected to the preamplifier 11 via this terminal 17.

When performing magnetic recording, the recording current from the preamplifier 11 is transferred to the rotary transformer 5 (annular [1-998522129
Each magnetic head 6 is connected via a cylindrical rotary transformer 14).
-9 (video heads 68-9a, audio heads 6b-9b). Further, in the reproduction mode, the current obtained by the magnetic heads 6 to 9 is outputted to the preamplifier 11 via the rotary transformer 5.

In this way, the rotary transformer 5 can transmit a total of eight channels of video and audio signals, four channels each, by combining the annular rotary transformer 12 and the cylindrical rotary transformer 14. Furthermore, since the rotary transformer 5 can be provided within a limited space within the tape guide drum device 1, it is possible to support multi-channel design without increasing the size of the lower rotating ram 2 and fixed drum 4.

Although the above embodiment has been explained using a camera-integrated video tape recorder as an example, the present invention is not limited to this and can be applied to any other device as long as it uses a rotating drum to perform magnetic recording/recording. Of course.

Effects of the Invention As mentioned above, the tape guide drum device according to the present invention has the following features:
Since the rotary transformer is composed of an annular rotary transformer formed in an annular shape along a radial plane and a cylindrical rotary transformer formed in a cylindrical shape along the axial direction, for example, the number of magnetic heads can be increased. Even if you want to increase the number of channels in the guide drum, this can be easily accommodated, and since the number of coils can be increased in both the radial and axial directions, the limited space inside the guide drum can be used effectively. This makes it possible to increase the number of channels without increasing the size of the guide drum. Therefore, for example, even in a camera-integrated video tape recorder, the guide drum can be made smaller and lighter by increasing the number of channels.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a tape guide drum device according to the present invention, FIG. 2 is a plan view of the tape guide drum device, and FIGS. 4(A) and (B) are a vertical sectional view and a plan view, respectively, for explaining an annular rotary transformer, and FIG. 5(A) and (B) are a cylindrical rotary transformer. FIG. 2 is a longitudinal cross-sectional view and a plan view for explaining a transformer. DESCRIPTION OF SYMBOLS 1... Tape guide drum device, 2... Rotating drum, 4... Fixed drum, 5... 0-critrans, 6
~9...Magnetic head, 6a-9a...Video head, 6b-9b...Audio head, 12...
Annular rotary transformer, 13a to 13h...coil,
14... Cylindrical rotary transformer, 15a to 15h.
...Coil, 16.17...Terminal. Patent Applicant Victor Japan Co., Ltd. Figure 2 Figure 2 1 Figure 3 (A) Figure 4 (A) (B)

Claims (1)

[Claims] a rotating drum that has a plurality of magnetic heads and is rotationally driven;
A tape guide drum device comprising: a fixed drum that rotatably supports the rotating drum; and a rotary transformer that is provided between the rotating drum and the fixed drum and transmits signals from the magnetic head. A tape guide drum device characterized in that the transformer includes an annular rotary transformer formed in an annular shape along a radial plane and a cylindrical rotary transformer formed in a cylindrical shape along an axial direction.