JPH09190602A - Head drum assembly for video cassette recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head drum assembly equipped with a transformer capable of adjusting the number of channels by the number of heads fitted to a rotary head drum. SOLUTION: The head drum assembly 200 is composed of a rotary head drum 220 fitted rotatably to a driving shaft 212 of a driving source 210, a fixed head drum 230 fixed and arranged between the driving source 210 and the rotary head drum 220 and to support the driving shaft 212 of the driving source 230, a large number of heads 222 and 224 fitted to the lower part edge of the rotary head drum 220 for the purpose of recording and reproducing a video signal, a rotary transformer part constituted by layering a large number of 1st annular members fitted to the rotary head drum 220 and one unit of a 2nd annular member and a stationary transformer part fitted to the fixed head drum. The rotary transformer part is formed by layering the same number of 1st annular members as the number of heads fitted to the head drum and one unit of the 2nd annular member so as to be equipped with channels corresponding to the number of heads.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records / records information like a video cassette recorder (hereinafter referred to as VCR).
The present invention relates to a reproducing device, and more particularly, to a head drum assembly including a ring-shaped stackable transformer so that the number of channels of the transformer can be adjusted according to the number of heads attached to the head drum.

[0002]

2. Description of the Related Art Generally, a device for recording / reproducing information such as a VCR is a device for recording video and audio signals on a magnetic tape running along a running system and for playing back the signals recorded on the magnetic tape. Commercial VCRs for household use are mainly β, VHS and 8 m depending on the width of the tape on which information is recorded.
It is roughly divided into m type. The tape is wound on a rewind reel and a supply reel provided in the cassette. V
When the cassette is inserted into the cassette insertion opening of the CR and the cassette is attached to the VCR deck, the tape loading mechanism positions the tape in the cassette at the running position.

The tape wound on the delivery reel is pulled by a capstan and a pinch roller and wound on a rewind reel. Three heads are arranged between the feeding reel and the rewinding reel, and contact the tape while the tape is running to erase, record and reproduce signals.

At this time, the head drum rotates at a predetermined speed and the head attached thereto records a video signal on a running tape or reproduces a video signal recorded on the tape. The head drum assembly generally records a video signal on a fixed head drum, a rotary head drum, a drive source for rotating the rotary head drum, a tape mounted on the rotary head drum and running, or a video signal recorded on the tape. It is arranged between a large number of heads to be played back, and a fixed head drum and a rotary head drum, and the video signal recorded by the head or the video signal reproduced by the head is transmitted from the signal processing system to the head or processed by the head. It consists of a transformer that transmits to the system.

The transformer of the head drum assembly is an element for transmitting a video signal converted into an electric signal between the head and the signal processing system. Recently, while preventing the electric fields generated from the electric coils arranged in the respective channels of the transformer from interfering with each other and the signals transmitted from the heads, the transformer manufacturing, processing and Research is being conducted on transformers that are easy to assemble.

FIG. 1 is a cross-sectional view of a prior art head drum assembly 100. As shown in FIG. 1, the conventional head drum assembly 100 includes a rotary head drum 11
0, fixed head drum 120, rotary head drum 1
A drive source 130 for rotating 10 and a large number of heads 112, 114 attached to the rotary head drum 110 for recording a video signal on a running tape and reproducing a video signal from the tape, and the heads 112, 114. 1
The video signal reproduced at 14 is transmitted to a signal processing system (not shown), and the video signal to be recorded is sent from the signal processing system to the head 1
It is composed of a transformer 140 that transmits the data to 12, 114.

FIG. 2 shows the head drum assembly 1 shown in FIG.
10 is a partial cross-sectional view showing a transformer 40 of No. 00. FIG.
As shown in FIGS. 1 and 2, the transformer 40 includes a stationary transformer unit 142 and a rotary transformer unit 144. Stationary transformer section 142 and rotary transformer section 144
Is a cylindrical shape, and the stationary transformer unit 142
Are fixedly attached to the fixed head drum 120, and the rotary transformer section 144 is attached to the rotary head drum 1.
It is attached to 10. A large number of channels are formed on the inner peripheral surface and the outer peripheral surface of the stationary transformer part 142 and the rotary transformer part 144 so as to face each other at regular intervals. The number of channels formed in each of the stationary transformer section 142 and the rotary transformer section 144 is the same as that of the head 11 attached to the rotary head drum 110.
The number matches 2,114. Each of the channels formed in the stationary transformer section 142 and the rotary transformer section 144 has an electric coil winding 1
50, 152, 160, 162 are arranged. The coil winding 150 of the stationary transformer 142,
Both ends of each of 152 are connected to a signal processing system through a flexible printed circuit board (not shown), and the coil windings 160 and 162 of the rotary transformer unit 144 are connected.
Both ends of each are connected to the heads 112 and 114.

In the head drum assembly 100 having the above-described structure, the video signal includes a stationary transformer section 142 and a rotary transformer section 144.
Coil windings 150, 152, 1 arranged in
Heads 112, 1 from the signal processing system through 60, 162
14 or from the heads 112 and 114 to the signal processing system. However, it is very difficult to manufacture and process the transformer 140 of the head drum assembly 100 according to the related art. In particular, the rotary transformer part 144 is formed by sintering ferrite powder into a cylindrical shape, and then it is fixed on the inner peripheral surface thereof. There is a problem that it is difficult to form channels at intervals.

[0009]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems of the prior art, and an object of the present invention is to adjust the number of channels according to the number of heads mounted on the head drum. It is an object of the present invention to provide a head drum assembly including a transformer that can be used.

[0010]

According to the present invention for achieving the above object, there is provided a rotary head drum mounted on a drive shaft of a drive source, and fixedly arranged between the drive source and the rotary head drum. A fixed head drum that supports the drive shaft of the drive source, a large number of heads that are attached to the lower edge of the rotary head drum to record and reproduce video signals, and a large number of heads that are attached to the rotary head drum. It is composed of a rotary transformer part formed by stacking one ring-shaped member and one second ring-shaped member and a stationary transformer part attached to the fixed head drum, and transmits a video signal from the head to the control part and controls the control part. The present invention provides a head drum assembly for a VCR including a transformer transmitting from the head to the head.

The first annular member of the rotary transformer portion includes a cylindrical wall portion and a flange portion formed radially inward at a lower portion of the cylindrical wall portion, and the second annular member serves as an annular piece and has a width and a height. Is the same as the width and height of the flange portion of the first annular member.

The rotary transformer portion is formed by stacking the plurality of first ring-shaped members and then stacking and adhering the second ring-shaped member on the uppermost first ring-shaped member of the stacked first ring-shaped members. To do.

When the first ring-shaped member and the second ring-shaped member are stacked, the upper part of the first ring-shaped member and the flange part of another first ring-shaped member, and the upper part of the first ring-shaped member and the second ring-shaped member. A channel is formed between. A large number of electric coils are arranged in the channel.

According to the number of heads mounted on the rotary head drum, the first annular member and the second annular member are combined to form the rotary transformer section.

In the thus constructed head drum assembly according to the present invention, when two heads are attached to the upper head drum, the two first ring-shaped members are stacked to form the uppermost one of the first ring-shaped members. By mounting the second ring-shaped member on the first ring-shaped member, channels can be formed between the first ring-shaped members and between the first ring-shaped member and the second ring-shaped member to form the rotary transformer part. Also, when four or six heads are attached to the upper head drum, a plurality of first ring-shaped members and one second ring-shaped member are stacked in this manner to provide channels corresponding to the number of heads. The rotary transformer section can be configured.

In such a state, electric coil windings are attached to the respective channels and both ends of the respective coil windings are connected to the respective heads. On the other hand, as the stationary transformer unit, a conventional stationary transformer unit is used. Coil windings are also attached to the channels formed on the outer periphery of the stationary transformer unit, and both ends of each coil winding are connected to the signal processing system through the flexible printed circuit board. The head drum assembly of the present invention as described above has advantages that the rotary transformer portion can be easily manufactured and assembled, and the number of channels corresponding to the number of heads can be easily adjusted.

The above objects and other features and advantages of the present invention will be apparent from the following description of some preferred embodiments of the present invention, which will be referred to next.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 3 is a cross-sectional view of a head drum assembly to which a transformer according to an exemplary embodiment of the present invention is attached, and FIG. 4 is a perspective view illustrating a rotary transformer portion of the head drum assembly according to an exemplary embodiment of the present invention. 5 is a sectional view of the transformer of the head drum assembly shown in FIG. 3 to 5, the head drum assembly includes two heads in a two-head system, and the transformer has two channels.

As shown in FIG. 3, a head drum assembly 200 according to the present invention includes a driving source 210 and a rotary head drum 2 mounted on a driving shaft 212 of the driving source 210.
20, a fixed head drum 230 arranged between the drive source 210 and the rotary head drum 220 and supporting a drive shaft 212 of the drive source 210, the rotary head drum 2
A plurality of heads 222, 224 for recording video signals on the tape and reproducing video signals from the tape, and a signal processing system (not shown) arranged between the rotary head drum 220 and the fixed head drum 230. From head 22
2, 222 to transmit video signals to the heads 222, 22
4 includes a transformer 240 for transmitting a video signal to the signal processing system.

The drive source 210 comprises a rotor portion, a stator portion, and a drive shaft 212, and the fixed head drum 23.
It is placed at the bottom of 0. Drive shaft 2 of drive source 210
12 extends through the fixed head drum 230,
It is supported by the bearing 250 and the second bearing 252. The rotor portion of the drive source 210 includes a rotor mounting member 213, a rotor support member 214, and a rotor 215. The rotor attachment member 213 is forcibly inserted (so as to be integrally fitted) into the lower portion of the drive shaft 212, and the rotor attachment member 213 is inserted.
A rotor support member 214 is fixed to 13 by screws. The rotor 215 is arranged on the inner wall of the rotor support member 214. The stator portion of the drive source 210 includes a stator support plate 216 and a stator 217. The stator support plate 216 is attached to the fixed head drum 230, and the stator 217 is suspended from the lower surface of the stator support plate 216 so as to face the rotor 215 of the rotor section.

The fixed head drum 230 includes a bottom portion, a cylindrical side wall portion, a cylindrical upper hub 232 extending upward from the center of the bottom portion, and a cylindrical lower hub 234 extending downward from the center of the bottom portion. Upper hub 232 and lower hub 234
Are connected through the center of the bottom. A step portion (step portion) is formed on the inner periphery of the upper end portion of the upper hub 232, and the first bearing 250 is arranged on the step portion. In addition, a step portion is also formed on the inner circumference of the lower end portion of the lower hub 234, and the second bearing 252 is arranged in the step portion. First
The bearing 250 and the second bearing 252 are the fixed head drum 230.
The drive shaft 212 of the drive source 210, which extends through the upper hub 232 and the lower hub 234 of the. The upper surface of the side wall portion of the fixed head drum 230 is inclined inward and downward.

The rotary head drum 220 has a cylindrical shape and is forcibly inserted into the upper portion of the drive shaft 212 of the drive source 210. A large number of screw holes are formed at an edge of the rotary head drum 220 and are spaced apart from each other at a predetermined angle.
A rotary transformer connecting portion 226 is projected in a circular shape around the axis line at a predetermined distance from the center axis line of 0. Further, a large number of heads 222 and 224 are arranged on the lower surface of the rotary head drum 220 so as to be separated from each other at a predetermined angle, and the heads 222 and 224 are fixed to the rotary head drum 220 with screws.

The rotary head drum 220 rotates at a speed determined by the driving source 210 in the recording or reproducing mode, so that a large number of heads 222 and 224 arranged on the lower surface of the rotary head drum 220 are imaged on the running tape. It records signals and reproduces video signals recorded on tape.

The transformer 240 includes a stationary transformer part 242 and a rotary transformer part 244 which are cylindrical. The stationary transformer unit 242 is disposed on the outer surface of the upper hub of the fixed head drum 230 and is fixed to the fixed head drum 230, and a plurality of first channels are formed on the outer peripheral surface of the fixed head drum 230 at predetermined intervals. There is. The rotary transformer part 244 is a rotary transformer connecting part 22 formed on the lower surface of the rotary head drum 220.
The upper surface is attached to 6.

Referring to FIG. 4, a rotary transformer section 244 according to one embodiment of the present invention is shown.
As the stationary transformer unit 242, a conventional stationary transformer unit is used and is not shown in the drawing. The stationary transformer portion 242 and the rotary transformer portion 244 are formed by sintering ferrite powder and then polishing the ferrite powder. As described above, the same number of channels as the heads 222 and 224 arranged on the lower surface of the rotary head drum 220 are formed on the outer peripheral surface of the stationary transformer portion 242 at predetermined intervals. The rotary transformer part 244 includes a first ring-shaped member 245 and a second ring-shaped member 2.
46. The first annular (annular) member 245 includes a cylindrical wall portion 245a and a flange portion 245b extending inward in the radial direction from the lower end portion of the cylindrical wall portion 245a. The second ring-shaped member 246 has a width and height that are equal to the flange portion 2 of the first ring-shaped member 245.
It is manufactured to have the same width and height as 45b.

As shown in FIG. 5, the rotary transformer portion 244 is formed by stacking the same number of the first annular members 245 and one second annular member 246 as the number of the heads 222 and 224 arranged on the lower surface of the rotary head drum 220. When joined together, a channel is formed between the cylindrical wall portion 245a and the flange portion 245b of the first annular member 245. Also,
A channel is formed between the first ring-shaped member 245 and the second ring-shaped member 246 arranged at the top.

Coil windings are arranged in the respective channels formed in the rotary transformer section 244 as described above. In the transformer 240 configured as described above, both ends of the coil windings arranged in the respective channels of the rotary transformer unit 244 are connected to the heads 222 and 224 attached to the lower portion of the rotary head drum 220. It On the other hand, both ends of each coil winding arranged in each channel of the stationary transformer unit 242 are connected to the signal processing system through the flexible printed circuit board.

Hereinafter, the operational relationship between the respective elements of the head drum assembly 200 to which the transformer 240 according to the present invention as described above is attached will be described. In the transformer 240 of the head drum assembly 200 according to the present invention, as described above, the stationary transformer part 242 is the stationary (fixed) head drum 2.
The rotary transformer part 244 is formed on the outer periphery of the upper hub 232 of 30 and is formed by stacking a plurality of first ring-shaped members 245 and one second ring-shaped member 246. The rotary transformer part 244 is connected to the rotary transformer formed on the lower surface of the rotary head drum 220. It is attached to the part 226. At this time, the multiple channels formed in the rotary transformer unit 244 face the multiple channels formed in the stationary transformer unit 242, respectively. Therefore, in the recording mode, the rotary head drum 220 rotates at a predetermined speed and a large number of heads 222 and 224 arranged on the lower surface of the rotary head drum 220 record video signals on the running tape.

At this time, the video signal is converted into an electric signal and the signal processing system moves the stationary transformer unit 24.
2 is transmitted to the coil winding of the stationary transformer unit 242, and the electric strength of the coil winding of the stationary transformer unit 242 causes a current to be induced in the coil winding of the rotary transformer unit 244 that rotates together with the rotary head drum 220.
2, 224. The heads 222 and 224 magnetize the running tape according to the strength of the induced current to record a video signal. In the reproducing mode, a current is induced in the heads 222 and 224 depending on the degree of magnetization of the traveling tape, and the induced current is transmitted to the coil winding of the rotary transformer unit 244. After that, a current is also induced in the coil winding of the stationary transformer section 242 by the strength of the current of the coil winding of the rotary transformer section 244, and the induced current is transmitted to the signal processing system through the flexible printed circuit board to reproduce the video signal. To be done.

[0030]

As described above, the head drum assembly of the present invention has the advantages that the rotary transformer portion can be easily manufactured and assembled, and the number of channels corresponding to the number of heads can be easily adjusted.

Although the present invention has been described in detail with reference to the embodiments, the present invention is not limited to the embodiments, and any person having ordinary knowledge in the technical field to which the present invention belongs may depart from the spirit and spirit of the present invention. Rather, the invention could be modified or changed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a head drum assembly according to the related art.

FIG. 2 is a partial cross-sectional view showing a transformer of the head drum assembly shown in FIG.

FIG. 3 is a cross-sectional view of a head drum assembly equipped with a transformer according to an exemplary embodiment of the present invention.

FIG. 4 is a perspective view showing a rotary transformer portion of a head drum assembly according to an exemplary embodiment of the present invention.

5 is a partial cross-sectional view showing a transformer of the head drum assembly shown in FIG.

[Explanation of symbols]

 200 head drum assembly 210 drive source 212 drive shaft 213 rotor attachment member 214 rotor support member 215 rotor 216 stator support plate 217 stator 220 rotary head drum 222, 224 head 226 rotary transformer connection part 230 fixed head drum 232 upper hub 234 lower hub 240 Transformer 242 Stationary Transformer Section 244 Rotary Transformer Section 250 First Bearing 252 Second Bearing

Claims (6)

[Claims] 1. A rotary head drum mounted on a drive shaft of a drive source; a fixed head drum fixedly arranged between the drive source and the rotary head drum to support the drive shaft of the drive source; A plurality of heads mounted on the lower edge of the rotary head drum for recording and reproducing video signals, a plurality of first ring-shaped members and one second ring-shaped member mounted on the rotary head drum are laminated. And a transformer for transmitting a video signal from the head to the controller or from the controller to the head. Head drum assembly for a video cassette recorder. 2. The first of the rotary transformer parts
The ring-shaped member includes a cylindrical wall portion and a flange portion formed inwardly in a radial direction at a lower portion of the cylindrical wall portion, and the second ring-shaped member is a ring-shaped piece having a width and a height of the flange portion of the first ring-shaped member. The head drum assembly for a video cassette recorder according to claim 1, wherein the head drum assembly has the same width and height. 3. The rotary transformer unit comprises: stacking the plurality of first ring-shaped members, and then stacking the stacked first first members.
The second ring-shaped member is laminated and adhered to the uppermost first ring-shaped member among the ring-shaped members.
A head drum assembly for a video cassette recorder according to claim 1. 4. When the first ring-shaped member and the second ring-shaped member are stacked, a channel is formed between the first ring-shaped members and between the first ring-shaped member and the second ring-shaped member. A head drum assembly for a video cassette recorder according to claim 3. 5. The head drum assembly for a video cassette recorder according to claim 3, wherein a plurality of electric coils are arranged in each of the channels. 6. The rotary transformer unit according to claim 3, wherein the first annular member and the second annular member are combined to form the rotary transformer unit according to the number of heads attached to the rotary head drum. Head drum assembly for the VCR video cassette recorder.