JPH01320616A - Rotary head device - Google Patents

Abstract

PURPOSE:To improve the assembling workability and to obtain a simultaneous synchronizing reproducing signal scarcely mixed with a recording signal by executing the connection of the secondary side rotation coil of a recording rotary transformer and a recording signal supply lead wire at the lower surface side of a rotary drum. CONSTITUTION:A coil 38 of a recording head 1 is connected to a fixed edge 41 of a head coil fixing member 40. A movable contact terminal 44 of a fixed plate 47 of an elastic contacting member is pressurized to a signal communication terminal 42 of the member 40 with a spring and the secondary side rotary coil 35 of a recording rotary transformer is connected. At present, when a recording signal is supplied to a primary side fixed coil 22c of a transformer, a signal is supplied through the coil 35 and the terminal 44 to the coil 38 and a magnetizing track is formed by the head 1. Corresponding to this, a reproducing signal is obtained from a reproducing signal. Thus, by connecting a rotary coil and a recording signal supply line at the lower surface side of a rotary drum, an assembling workability is improved and a reproducing signal scarcely mixed with a recording signal can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary head device mainly used in a magnetic recording/reproducing apparatus (hereinafter referred to as a VTR) for recording (or reproducing) video signals on a magnetic tape.

BACKGROUND OF THE INVENTION Traditionally, VTR rotary head devices have been known to apply playback signals from a rotating video head to a secondary rotary transformer that rotates together with the video head, and a corresponding fixed transformer.
A common configuration was to add it to the VTR's preamplifier from the next side. In recent years, VTRs have become more and more multi-functional, and a recording head is placed before the reproduction head, and the magnetized track being recorded by the recording head is simultaneously reproduced by the reproduction head (hereinafter referred to as "simultaneous reproduction"). Rotary head devices have been provided that are configured to improve recording reliability.

A conventional example will be described below using drawings.

FIG. 4 shows a sectional view of a conventional rotary head device.

In the figure, reference numeral 1 denotes a recording head, which is capable of forming magnetized tracks on a magnetic tape (not shown) together with a recording head 1' (not shown) provided 180° apart from the recording head 1. Reference numeral 2 denotes a recording head base, to which the recording head 1 is adhesively fixed at the tip thereof, and is fixed to the lower end of the rotating drum 4 with screws 3. A recording head coil fixing member 3 is adhesively fixed to the recording head base 2, and a terminal of a recording head coil (not shown) wound around the recording head 1 is fixed thereto. 6 is the playback head, 180 for playback head 6
It is possible to scan the magnetized track formed by the recording heads 1, 1' together with a reproduction head (not shown) provided at a distance of 0,000 degrees, and output a reproduction signal. A reproduction head 6 is adhesively fixed to the tip of a reproducing rad pace, and is fixed to the lower end of the rotating drum 4 with screws 8. 9 is a remanufactured RAD coil fixing member that is adhesively fixed to the remanufactured RAD base 7;
A terminal of a reproducing head coil wound around the reproducing head 6 is fixed. Reference numeral 10 denotes a fixed lower drum capable of guiding a magnetic tape on its outer peripheral surface.

Reference numeral 11 denotes a rotating disk, which is fixed to a rotating shaft 12 at the center and is rotatable by being supported by bearings 13 and 13'.

14 is a thrust stopper fixed to the lower end of the rotating shaft 12 with a screw 16; 16 is an electric motor rotor fixed to the thrust stopper 14 with a screw 17; 18 is glued to the rotor 16 of the electric motor. Fixed rotor magnet, 1
Reference numeral 9 denotes a stator coil of the electric motor, which generates rotational force in the rotor magnet 18 when energized. 20 is a screw that tightens and fixes the rotating drum 4 to the rotating disk 11; 21 is a secondary rotating core of a recording rotating transformer that is adhesively fixed to the lower surface of the rotating disk 11; The secondary rotating coil that performs transmission is located in the grooves 21a and 2.
1b.

Reference numeral 22 denotes a primary fixed core of the recording rotary transformer which is adhesively fixed inside the fixed lower drum 10 opposite to the secondary core 21 of the recording rotary transformer. A fixed coil is provided. Reference numeral 23 denotes a regenerative rotary transformer mounting tool which is fastened to the upper end of the rotary disk 11 with a screw 24, to which a secondary rotary core 25 of the regenerative rotary transformer is adhesively fixed.

Reference numeral 26 denotes a primary fixed core of the regenerative rotary transformer provided outside corresponding to the secondary rotary core of the regenerative rotary transformer, and its outer peripheral portion is adhesively fixed to the regenerative rotary transformer holder 27 . Reference numerals 25a and 25b denote grooves provided in the secondary rotating core 25, and are provided with secondary rotating coils for transmitting reproduction signals from the respective reproduction heads 6 and 6'. 26a.

Reference numeral 26b denotes a groove provided in the primary fixed core 26, in which a primary fixed coil for outputting a reproduction signal to the outside is provided. 28 is a regenerative rotating transformer holder mounting tool which is fixed to the outer periphery of the lower drum 1Q with a screw 29, and 30 is a regenerative rotating transformer holder mounting tool 28 which is fastened to the regenerative rotating transformer holder 27. Indicates the screw to be used.

Next, 31 and 31' are preamplification means configured on the upper surface side of the rotating drum 4, which includes brushes and a slip ring (not shown).
The device is supplied with power from outside and reaches an operating state, and the reproduction signals from the reproduction head 6, 6' are inputted and individually amplified, and the secondary Added to the side rotating coil. Reference numerals 32 and 33 denote through holes provided in the rotating drum 4 near the recording head base 2 and the reproducing head base 7, respectively, through which signal transmission lead wires are connected to the recording head coil fixing member 5 and the reproducing head coil fixing member 9, respectively. is guided to the upper surface side of the rotating drum 4. Reference numeral 34 denotes a through hole provided in the rotating disk 11, through which the end of the secondary rotating coil provided in the secondary rotating core 21 of the recording rotating transformer is guided to the upper surface side of the rotating disk 11.

Next, FIG. 6 shows a layout diagram of the recording heads 1, 1' and the reproducing heads 6, 6' in a conventional rotary head device. 1a, 1b, 1a', and 1b' are recording signal transmission lead wires, which are located near the recording head coil fixing member adhesively fixed to the recording head base 2゜2 and the through holes 34 and 34' on the upper surface side of the rotating disk 11, respectively. The recording signal transmission lead wire connection members 36 and 36' provided in the recording signal transmission lead wire connection members 36 and 36' are connected to each other.

35a, 3sb, 35a', 3tsb' are both ends of a secondary rotating coil provided in the secondary rotating core 21 of the recording rotating transformer, and are guided through through holes 34 and 34' to connect recording signal transmission lead wires. It is connected to members 36° and 36'. 37a, 37b, 37a'.

Reference numeral 37b' denotes read signal transmission lead wires from the read head coil fixing member, which are connected to the preamplifying means 31 and 31', respectively.

Next, the operation in the conventional example shown in FIGS. 4 and 5 will be explained. When the VTR is put into the recording state, the electric motor stator coil 19 is energized and rotational force is generated in the rotor magnet 18, which tightens and fixes the rotor magnet 18 through the thrust stopper 14° rotating shaft 122 rotating disk 11.
Secondary rotating core 21 of the recording rotating transformer. Secondary rotating core 251 of the regenerative rotating transformer rotating drum 4. Rotating shaft 12 of recording head 1.1', reproducing head e, 6', etc.
The part fixed to rotates. When a recording signal is supplied from the primary fixed coil of the recording rotary transformer, both ends 35a and 35b of the secondary rotary coil.

35a', 35b' and record signal transmission I
Magnetic flux is applied to the recording head coils wound around the recording heads 1 and 1' through the J-column wires 1a, 1b, 1a', and 1b/, respectively, and magnetic flux is generated from the recording heads 1 and 1', and a new magnetic flux is generated on the magnetic tape. A magnetized track is formed.

A reproduction signal is obtained from the reproduction heads 1, 1' corresponding to the magnetized track being formed by the recording head. and,
Reproduction signals from the reproduction heads 1, 1' are transmitted through reproduction signal transmission lead wires 37a, 37b, 37a'.

37b' to the preamplifier means 31, 31', where they are individually amplified and applied to the secondary rotating coil provided in the secondary rotating core 25 of the regenerative rotating transformer, and the corresponding primary fixed It is output to the primary side fixed coil of the core 26 and is added to the subsequent signal processing circuit.

Problems to be Solved by the Invention However, in the above-described conventional rotary head device, both ends 36a, 35 of the secondary rotary coil of the recording rotary transformer
b, 36a', 36b' are the through holes 3 of the rotating disk 11.
4. 34' and pull it out to the top side, and record signal transmission lead wires 1a and 1b.

1a', 1b' are guided into the through holes 32, 32' of the rotating drum 4, pulled out to the upper surface side, and the respective lead wires are connected to the recording signal transmission lead wire connecting member 36. 36', these assembling steps become complicated, which causes a decrease in the efficiency of assembling the rotary head device.

However, in recent years, high-frequency recording has progressed on VTRs, such as NT
High-quality VT with approximately twice as many horizontal scanning lines as SC video signals
Rotary head devices in digital VTRs that A/D convert R and NTSC video signals and digitally record them on magnetic tape record and reproduce high frequencies that are four to five times higher than the recording frequency of conventional rotary head devices. is required to do so.

In these rotary head devices compatible with high-frequency recording and reproduction, both ends 35a, 35b, and 36a' of a secondary rotary coil of a recording rotary transformer are wired on the upper surface side of the rotary disk 11 and the rotary drum 4.

35b' and a recording signal transmission lead wire 1a of the recording head,
The recording signal passing through 1b, 1a', 1b' is transferred to the reproduction signal transmission lead wires 37a, 37b, 3a/.

37b' and the preamplifier means 31 and 31' arranged on the upper surface side of the rotating drum 4 as crosstalk, which has the disadvantage of lowering the reliability of the simultaneous reproduction signal.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary head device that eliminates the conventional drawbacks, improves the workability of assembling a rotary head, and enables simultaneous reproduction of signals with less mixing of recording signals.

Means for Solving the Problems The present invention fixes a video head disposed on a rotating drum and a head coil wound around the video head at one end,
A head coil fixing member that has a signal transmission terminal for transmitting signals at the other end and is arranged on the rotating drum, a rotating disk that fixes the rotating drum and rotates integrally, and a rotating disk that is provided on the rotating disk and can rotate integrally. A rotary transformer that transmits signals between a video head and an external fixed part using a secondary rotating coil and a corresponding primary fixed coil; The elastic contact member has a movable contact terminal that faces and comes into elastic contact with the signal transmission terminal of the hent coil fixing member at the end thereof.

According to the above-described structure, the present invention fixes a video head and a head coil wound around the video head to one end,
During the assembly work of attaching a rotating drum, on which a head coil fixing member having a signal transmission terminal for transmitting signals to the other end of the head coil fixing member is attached, to a rotating disk, the signal transmitting terminal of the head coil fixing member disposed on the rotating drum is attached. The movable contact terminal of the elastic contact member is brought into elastic contact to connect the secondary rotating coil of the rotating transformer and the signal transmission terminal of the head coil fixing member. Then, recording/reproduction signals are transmitted between the fixed coil on the primary side of the rotary transformer and the head coil wound around the video head.

EXAMPLE Hereinafter, an example of a rotary head device according to the present invention will be described with reference to FIGS. 1 to 3. In addition, Fig. 4.

Components that are the same as those in the conventional example shown in FIG. 5 are given the same numerals and their explanations will be omitted.

FIG. 1 shows a detailed view of the main parts of a rotary head device according to an embodiment of the present invention. In the figure, 38.38' is y-dove 1 for recording.
, 1' are wound through the head coil through holes 39 and 39 of the recording head bases 2 and 2', respectively.
' is guided. 40° 40' is a recording head coil fixing member made of a copper foil printed circuit board, which is adhesively fixed to the recording rad space 2, 2', and the recording head coil 38, 38' is connected and fixed to one end of the lower surface side shown by the broken line. Fixed end 41a.

41 b, 41 a', 41 b' and signal transmission terminals 42a, 42b, 42a', 42b' for transmitting signals to the other end.
and is provided. 3a and 3a' are guide holes for fixing the recording head base 2 and 2' to the threaded part 3b (sb') of the rotating drum 4 with screws 3 and 3', and 8b (ab') is for tightening the playback head base. 20a is a guide hole for tightening and fixing the rotating drum 4 to the threaded portion 2ob of the rotating disk 43; 4a is a guide hole for guiding the rotating drum 4 to the center of the rotating disk 43; 1c'; 6c are guide windows for recording and reproducing heads provided on the outer periphery of the rotary drum 4; 24b are screw portions 44a and 44b for tightening and fixing the reproducing rotary transformer mounting tool 23;

44a', 44b' are movable contact terminals made of conductive material, and holders 45a, 4tsb, 45
A', 45b' are elastically supported in the direction of arrow 46 by the action of a built-in coil spring so as to be movable at the center of each. These movable contact terminals, a holder, and a coil spring built into the holder constitute an elastic contact member. 47 is a fixing plate of an elastic contact member made of a copper foil printed circuit board, which is adhesively fixed to the upper part of the secondary rotating core 21 of the recording rotating transformer, and is wound around the secondary rotating core 21 of the recording rotating transformer. Holders 45a, 45b, 45a', 4 disposed at both ends of the secondary rotating coil.
sb' are respectively connected.

Next, FIG. 2 is a sectional view of the main parts of the rotary head device of this embodiment, including the recording head 1 (1') and the reproducing head 6 (6').
) are respectively fixed to the rotating drum 4, and the assembled state is shown in which the rotating drum 4 is tightened and fixed to the rotating disk 43 with the screws 2o. As shown in the figure, a movable contact terminal 44a elastically supported by a holder 45a disposed on a fixing plate 47 of the elastic contact member faces the recording head coil fixing member 40 and is in elastic contact therewith.

Next, FIG. 3 shows a wiring diagram of the main parts of the rotary head device of the embodiment, and shows a recording head coil 3 wound around the recording head 1.
8 is the fixed end 41a of the recording head coil fixing member 4°, 4
1b and are fixedly connected to each other. A movable contact terminal 44a is provided on the holders 45a and 4sb arranged on the fixed plate 47 of the elastic contact member.

Coil springs 48a and 48b are built-in to elastically bias the movable contact terminals 44a and 44b in the direction of the arrow 46, respectively.
44b is pressed against the signal transmission terminals 42a and 42b of the recording head coil fixing member 40. Both ends 35a of the secondary rotating coil of the recording rotating transformer are mounted on the holders 45a, *sb.

3sb are each connected and fixed.

The configuration described above also applies to the connection between the recording head coil of the recording head 1', which is provided 18a0 apart from the recording head 1, and the secondary rotating coil of the recording rotation transformer.

Next, the operation of the embodiment of the rotary head device of the present invention is as follows.
When the VTR is placed in the recording state, the electric motor stator coil 19 is energized, similar to the conventional example shown in FIG. 4, and rotational force is generated in the rotor magnet 18, causing the portion fixed to the rotating shaft 12 to rotate.

If a recording signal is supplied from both ends 22ct and 22ct' of the primary fixed coil 22c of the recording rotary transformer shown in FIG.
a, 3sb, holder 48a.

48b, movable contact terminals 44a, 44b, and signal transmission terminal 42a of recording head coil fixing member 4o.

A recording signal is transmitted to the recording head coil 38 through 42b1 and fixed ends 41a and 41b, magnetic flux is generated from the recording head 1, and a new magnetized track is formed on the magnetic tape. A reproduction signal is obtained from the reproduction heads 1, 1' corresponding to the magnetized track being formed by the recording head. The reproduction signal from the reproduction head 1.1' is transferred to reproduction signal transmission lead wires 37a, 37b, 37a', 3 as shown in FIG.
7b' to the preamplification means 31.31';
The signals are individually amplified and added to the secondary rotating coil provided in the secondary rotating core 25 of the regenerative rotating transformer, and output to the corresponding primary fixed coil of the primary fixed core 26 to generate subsequent signals. Joins the processing circuit.

Effects of the Invention As described above, according to the present invention, the connection between both ends of the secondary rotating coil of the recording rotating transformer and the recording signal transmission lead wire from the recording head is made on the lower surface side of the rotating drum. It is possible to eliminate the complicated assembly process of the example and improve the workability of assembling the rotary head device. Furthermore, even when the present invention is implemented in a high-speed rotating head device such as a high-quality VTR or a digital VTR, the secondary side of the recording rotary transformer, which is drawn out to the upper surface side of the conventional rotary disk and rotary drum, can be used. The recording signal passing through the recording signal transmission lead wires wired to both ends of the rotating coil and the recording head is mixed into the reproduction signal transmission lead wire and preamplification means wired to the reproduction head as crosstalk. This makes it possible to obtain high-quality simultaneous reproduction signals.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing details of the main parts of a rotary head device according to an embodiment of the present invention, Fig. 2 is a sectional view of the main parts of the rotary head device, and Fig. 3 is a wiring connection of the main parts of the rotary head device. Figure 4 shows a conventional rotating head, 21...
Secondary rotating core of recording rotating transformer, '35a,
3s b;... Secondary rotating coil of recording rotating transformer, 38, 38'... Recording head coil,
40, 40'...recording head coil fixing member,
42a, 42b, 42a', 42b'--signal transmission terminals of recording head coil fixing member, 43...
Rotating disks, 44a, 44b, 44a'. 44b'----Movable contact terminal, 45a,
45 b. 46a', 4sb'...Holder, 47...
...Fixing plates of elastic contact members, 48a, 48b...
...Coil spring. Figure 2 Figure 3

Claims (1)

[Claims] A video head arranged on a rotating drum, a head coil wound around the video head fixed at one end, and a signal transmission terminal for transmitting a signal at the other end, the head arranged on the rotating drum. A coil fixing member, a rotating disk that fixes the rotating drum and rotates integrally with it, a secondary coil that is provided on the rotating disk and can rotate together, and a corresponding primary fixed coil that connects the video head to the outside. a rotary transformer for transmitting signals to and from a fixed part; a movable contact terminal having a secondary rotary coil of the rotary transformer fixed at one end and elastically contacting a signal transmitting terminal of the head coil fixing member at the other end; What is claimed is: 1. A rotary head device comprising: an elastic contact member having the following features: