GB2308749A - Cylindrical rotary transformer including stacked annular core members - Google Patents
Cylindrical rotary transformer including stacked annular core members Download PDFInfo
- Publication number
- GB2308749A GB2308749A GB9626863A GB9626863A GB2308749A GB 2308749 A GB2308749 A GB 2308749A GB 9626863 A GB9626863 A GB 9626863A GB 9626863 A GB9626863 A GB 9626863A GB 2308749 A GB2308749 A GB 2308749A
- Authority
- GB
- United Kingdom
- Prior art keywords
- head drum
- rotary
- transformer
- heads
- annular member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/18—Rotary transformers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
- G11B15/61—Guiding record carrier on drum, e.g. drum containing rotating heads
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
- G11B15/66—Threading; Loading; Automatic self-loading
- G11B15/665—Threading; Loading; Automatic self-loading by extracting loop of record carrier from container
- G11B15/6653—Threading; Loading; Automatic self-loading by extracting loop of record carrier from container to pull the record carrier against drum
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
- G11B5/53—Disposition or mounting of heads on rotating support
- G11B5/531—Disposition of more than one recording or reproducing head on support rotating cyclically around an axis
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Description
A HEAD DREN ASSEMBLY OF A VIDEO CASSETTE RECORDER
The present invention relates to an information recording and reproducing apparatus, such as a video cassette recorder (hereinafter referred to as VCR), and more particularly to a head drum assembly including an annular transformer which is capable of being piled up in such a manner that the number of channels of the transformer are adjustable in accordance with the number of heads mounted on a head drum.
In general, an information recording and reproducing apparatus such as a VCR records video signals and audio signals onto a magnetic tape which is driven through a driving system or reproduces video signals and audio signals from the magnetic tape. The
VCR is divided into three types; p, VHS, and 8mm according to the width of the tape on which an information is recorded. The tape is wound on a supply reel and a take-up reel provided within a cassette. When the cassette is inserted into the cassette inserting port and is mounted on the VCR deck a tape loading mechanism moves the tape from the cassette to a driving position.
The tape. wound on the supply reel is drawn by a capstan and a pinch roller so as to be wound on the take-up reel. Three heads are disposed between the supply reel and the take-up reel so that the three heads erase, record. and reproduce signals by making contact with the tape during a driving of the tape.
At this time, a head drum rotates at a predetermined velocity so that heads mounted on the head drum record video signals onto a tape or reproduce video signals recorded on a tape. A head drum assembly generally comprises a stationary head drum, a rotary head drum, a driving source for rotating the rotary head drum, a plurality of heads mounted on the rotary head drum, for recording video signals onto a tape being driven or reproducing video signals recorded on a tape being driven. and a transformer disposed between the stationary head drum and the rotary head drum, for transferring video signals to be recorded from a signal control system to the heads or for transferring video signals reproduced from the heads to the signal control system.
The transformer of the head drum assembly is an element for transferring video signals converted into electric signals from the heads to the signal control system and vice.versa. In recent times, there have been various efforts to make and assemble a transformer which can prevent the electric signals transferred from electric coils to each of heads or from each of heads to the electric coils from being interrupted by electric fields which are created at electric coils disposed in each of channels of the transformer.
FIG. 1 is a cross sectional view of a head drum assembly 100 according to a conventional art. As shown in FIG. 1, the head dnan assembly 100 according to the conventional art comprises a rotary head drum 110, a stationary head drum 120, a driving source 130 for rotating the rotary head drum 110, a plurality of heads 112 and 114 mounted on the rotary head drum 110, for recording video signals onto a tape being driven or for reproducing video signals recorded on a tape being driven, and a transformer 140 for transferring video signals to be recorded from a signal control system to heads or for transferring video signals reproduced from the heads to the signal control system.
FIG. 2 is a partial sectional view of the transformer 140 of the head drum assembly 100 shown in FIG. 1. As shown in FIGs. 1 and 2, the transformer 140 includes a stationary transformer section 142 and a rotas transformer section 144. The stationary transformer section 142 and the rotary transformer section 144 have a cylindrical shape, and the stationary transformer section 142 is fixedly mounted on the Stationary head dnirn 120 while the rotary transformer section 144 is attached to the rotary transformer section 144. A plurality of channels are formed apart from each other on the outer periphery of the stationary transformer section 142 and the inner periphery of the rotary transformer section 144, and the'channels of the stationary transformer are opposite the rotary transformer. The number of channels respectively formed on the stationary transformer section 142 and the rotary transformer section 144 is the same as the number of heads 112 and 114 mounted on the rotary head drum 110. Electric coil windings 150, 152, 160.
and 162 are arranged on each channel of the stationary transformer section 142 and the rotary transformer section 144. Opposing ends of coil windings 150 and 152 of the stationary transformer section 142 are connected through a flexible printed circuit board to a signal control system, and opposing ends of coil windings 160 and 162 of the rotary transformer section 144 are connected to the heads 112 and 114.
In the head drum assembly 100 as constructed above, video signals pass through each of the coil windings 150. 152, 160, and 162 respectively disposed on the channels of the stationary transformer section 142 and the rotary transformer section 144 and are transferred from the signal control system to the heads 112 and 114 or from the heads 112 and 114 to the signal control system. However, it is substantially difficult to make the transformer 140 of the head drum assembly 100 according to the prior art.
Particularly, there is a problem in that it is difficult to form the channels on the periphery of the rotary transformer section 144 and to space apart from each other at a predetermined distance after forming the rotary transformer section 144 in a cylindrical shape by sintering ferrite powder.
The present invention has been made to overcome the above described problelr. of the prior art. It is an object of the present invention to provide a head drum assembly of a
VCR including an annular transformer which is capable of being piled up so that the number of channels of the transformer are adjustable in accordance with the number of heads mounted on a head drum.
To accomplish the above object of the present invention, there is provided a head drum assembly of a VCR which comprises: a rotary head drum which is mounted on a driving shaft of a driving source; a stationary head drum fixedly disposed between said driving source and said rotary head drum, for supporting said driving shaft of said driving source; a plurality of heads attached to edge of a lower portion of said rotary head drum, for recording or reproducing video signals; and a transformer section for transferring the video signals from the heads to a signal control system or for transferring the video signals from the signal control system to the heads, said transformer comprising a rotary transfortner which is formed by piling a plurality of first annular members and a second annular member and is attached to said rotary head drum, and a stationary transformer which is attached to said stationary head drum.
The plurality of said first anrmlar members of said rotary transformer section include a cylindrical wall portion and a flange portion formed inwardly at a lower portion of the cylindrical wall portion, respectively, said second annular member thereof is an annular plate and has the same width and height as the flange of said first annular member.
The rotary transformer section is formed in such a manner that after piling the plurality of said firs. annular members, said second annular member is piled up on an uppermost first annular members and adheres to the uppermost first annular member.
When piling the plurality of said first annular member and said second annular member, channels ar: defined between said first annular members and between said first annular member and said second annular member.
A plurality of electric coils are arranged in each of the channels.
The rotary transformer section can be formed in such a manner that the first annular members, a number of which are the same as a number of the heads mounted on the rotary head drum, and the second annular member are incorporated with each other.
In the head drum assembly according to the present invention, in the case of mounting two heads on the rotary head drum, the rotary transformer section is formed in such a manner that two first annular member are piled and second annular member is piled up on the uppermost first annular member so that channels are formed between the first annular members and between the first annular member and the second annular member. In the case of mounting four or six heads on the rotary head drum, a plurality of the first annular members and one of the second annular members are piled up in such a manner as described above, so a transformer having a plurality of channels corresponding to the number of heads can be formed. And then, electric coil windings are arranged on each of the channels; and opposing ends of each of the coil windings are connected to each of the heads. On the other hand, a stationary transformer section according to the prior art is used as the stationary transformer section of head drum assembly. Also, the coil windings are respectively disposed in channels formed on the periphery of the stationary transformer section, and both ends of each of the coil windings are connected through a flexible printed circuit board to a signal control system. As described above, in the head drum assembly according to the present invention. there are advantages in that it is easy to make the rotary transformer section and to adjust the number of channels in accordance with the number of heads.
The above object and other advantages of the present invention will become more apparent by describing in detail the preferred embodiment thereof with reference to the attached drawings, in which:
FIG. 1 is a sectional view of a head drum assembly according to the conventional art;
FIG. 2 is a partial sectional view of a transformer of the head drum assembly shown in FIG. 1;
FIG. 3 is a sectional view of a head drum assembly according to one embodiment of the present invention, in which a transformer is mounted;
FIG. 4 is a perspective view of a rotary transformer of the head drum assembly according to the present invention; and
FIG. 5 is a partial sectional view of a transformer of the head drum assembly shown in FIG. 4.
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 3 is a sectional view of a head drum assembly according to one.embodiment of the present invention, in which a transformer is mounted, PIG. 4 is a perspective view of a rotazy transformer of the head drum assembly according to the present invention, and
FIG. 5 is a partial sectional view of a transformer of the head drum assembly as showy in
FIG. 4. In FIGs. 3 to 5, the head drum assembly is a aZo head type and includes a transformer having two channels formed therein.
As shown in FIG. 3, the bead drum assembly 200 according to the present invention includes a driving source 210 such as an electric motor, a rotary head drum 220 mounted on a driving shaft 212 of driving source 210. a stationary head drum 230 disposed between driving source 210 and rotary head drum 220, for supporting driving shaft 212 of driving source 210, a plurality of heads 222 and 224 arranged on rotary head drum 220, for recording video signals onto a tape or for reproducing video signals recorded on the tape, and a transformer 240 disposed between rotary head drum 220 and stationary head drum 230, for transferring video signals from a signal control system (not shown) to heads 222 and 224 or for transferring video signals from heads 222 and 224 to the signal control system.
Driving source 210 is comprised of a rotor section, a stator section, and driving shaft 212, and is disposed on the lower portion of stationary head drum 230. Driving shaft 212 of driving source 210 extends through stationary head drum 230 and is supported by a first bearing 250 and a second bearing 252. The rotor section of driving source 210 comprises a rotor mounting member 213, a rotor supporting member 214, and a rotor 215. Rotor mounting member 213 is tightly fitted to the lower portion of driving shaft 212, and rotor supporting member 214 is fixed by a screw to rotor mounting member 213. Also, rotor 215 is arranged on the inner wall of rotor supporting member 214. The stator section of driving source 210 comprises a stator supporting plate 216 and a stator 217. Stator supporting plate 216 is attached to stationary head drum 230, and stator 217 is suspended from the lower surface of stator supporting plate 216 so as to be in opposition to rotor 215 of rotor section.
Stationary head drum 330 includes a bottom portion, a cylindrical wall portion. an upper hub 232 extending upwardly from a center of the bottom portion, and a lower hub 234 extending downwardly from the center of the bottom portion. Upper hub 232 and lower hub 234 pass through the center of the bottom portion and are connected to each other. A step portion is formed on the inner perisher) of an upper end of upper hub 232, and a first bearing 250 is disposed thereon. Also, a step portion is formed on the inner periphery of a lower end of lower hub 234, and a second bearing 252 is disposed thereon.
First bearing 250 and second bearing 252 support driving shaft 212 extending through upper hub 232 and lower hub 234 of stationary head drum 230. The upper surface of side wall of stationary head drum 230 is inclined inwardly.
Rotary head drum 220 has a cylindrical shape and is tightly fitted to an upper portion of driving shaft 212 of driving source 210. A plurality of screw-holes are formed on an edge of rotary head drum 220 and are spaced apart from each other by a predetermined angle, and a rotary transformer connecting portion 226 projects from a bottom surface of rotary head drum 220 and is spaced apart from longitudinal axis of rotary head drum 220 by a predetermined distance circumferentially. Also, a plurality of heads 222 and 224 are arranged on the bottom surface of rotary head drum 220 are spaced apar from each other by a predetermined angle, and each of heads 222 and 224 is fixed by screws to rotary head drum 220.
In a recording or a reproducing mode, rotary head drum 220 is rotated by driving source 210 at a prcdetermined velocity, so the plurality of heads 222 and 224 ,arranged on the bottom surface of rotary head drum 220 records the video signals onto the tape being driven or reproduces the video signals recorded on the tape.
Transformer 240 includes stationar transformer section 242 and rotary transformer section 244. which have cylindrical shapes. Stationary transformer section 242 is disposed on the periphery of upper hub 232 of scationar,v head drum 230 and is fixed thereto. A plurality of first channels are formed on the periphery of stationary transformer section 242 and are spaced apart from each other by a predetermined distance. The upper surface of rotary transformer section 244 is attached to rotary transformer connecting portion 226 projecting from the bottom surface of rotary head drum 220.
Referring to FIG. 4, rotary transformer section 244 according to the preferred embodiment of the present Invention is shown in FIG. 4. Stationary transformer section according to the prior art is used as stationary transformer section 242, and stationary transformer section 242 is not shown in FIG. 4. Stationary transformer section 242 and rotary transformer section 244 are formed by sintering ferrite powder, and are then polished. As described above, channels. the number of which being the same as the number of heads 222 and 224 arranged at the bottom of rotary head drum 220, are formed on the periphery of stationary transformer section 242 and spaced apart from each other by a predetermined distance. Rotary transformer section 244 includes a first annular member 245 and a second annular member 246. First annular member 245 comprises a cylindrical wall portion 245a and a flange 245b extending inwardly from a lower portion of the cylindrical wall portion 245a. Second annular member 246 is made to have the same width and height as the flange of first annular member 245.
As shown in FIG. 5,. in rotary transformer section 244, when piling first annular members 245, the numbers of which being the same as the number of heads 222 and 224 arnnged at the bottom of rotary head drum 220, and piling one of the second annular members 246 and when attaching them to each other, channels are formed between the cylindrical wall portion 245a of first annular member 245 and flange portion 245b. Coil windings are arranged at the each of the channels formed in rotary transformer section 244 as described above. In transformer 240 as constructed above, Opposing ends of respective coil windings arranged at each of the channels of the rotary transformer section 244 are connected to each of heads 222 and 224. On the other hand, opposing ends of respective coil windings arranged at each of the channels of stationary transformer section 242 are connected through a flexible printed circuit board to a signal control system.
Hereinafter, the operation of each of the elements of head drum assembly 200, in which transformer according to the present invention is mounted, will be described.
In transformer 240 of head drum assembly 200 according to the present invention, stationary transformer section 242 is disposed on the periphery of upper hub 232 of stationary transformer section 230, and rotary transformer section 244, which is formed by piling the plurality of first annular members 245 and one of second annular members 246. is attached to rotary transformer connecting portion 226, which is formed on the bottom surface of rotary head drum 220. At this time, the plurality of channels which are formed on rotary transformer section 244 are opposite to the plurality of channels which are formed on stationary transtormer section 242. Accordingly, in a recording mode, rotary head drum 220 rotates at a predetermined velocity, so the plurality of heads 222 and 224 which are arranged at the bottom surface of rotary head drum 220 records the video signals onto the tape being driven. At this time, the video signals are converted into electric signals and transmitted from signal control system to the coil windings of stationary transformer section 242, and a current is induced to coil windings of rotary transformer section 244. which rotates along with rotary head drum 220, according to a current intensity of coil windings of stationary transformer section 242, and is transmitted to heads 222 and 224. Heads 222 and 224 magnetize the tape being driven according to the intensity of the induced current and record the video signals onto the tape. In a reproducing mode, a current is induced according to a magnetization state of the tape being driven to heads 222 and 224, and the induced current is transmitted to the coil windings of rotary transformer section 244. Then, current also is induced to stationary transformer section 242 according to the current intensity of the coil windings of rotary transformer section 244. The induced current is transmitted through the flexible printed circuit board to the signal control system, and the video signals are reproduced.
While the present invention has been paiticularly shown and described with reference to a particular embodiment thereof, it will be understood by those skilled in the art that various changes in form and detail may be effected therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A head drum assembly of a VCR having a rotary head drum mounted on a driving shaft of a driving source, a stationary head drum fixedly disposed between said driving source and said rotary head drum, for supporting said driving shaft of said driving source, a plurality of heads attached to an edge of a lower portion of said rotary head drum, for recording or reproducing video signals, and a transformer section for transferring the video signals from the heads to a signal control system or for transferring the video signals from the signal control system to the heads,
characterized in that said transformer comprises a rotary transformer which is formed by piling a plurality of first annular members, and a second annular member and is attached to said rotary head drum, and a stationary transformer which is attached to said stationary head drum.
2. The head drum assembly of a VCR as claimed in claim 1, characterized in that each of said first annular members of said rotary transformer section include a cylindrical wall portion and a flange portion formed inwardly at a lower portion of the cylindrical wall portion, said second annular member thereof is an annular plate and has the same width and height as the flange of said first annular member.
3. The head drum assembly of a VCR as claimed in claims 1 or 2, characterized in that said rotary transformer section is formed in such a manner that after piling the plurality of said first annular members said second annular member is piled up an uppermost first annular member and adheres to the uppermost first annular member.
4. The head drum assembly of a VCR as claimed in claims 1 or 2, characterized in that when piling the plurality of said first annular members and said second annular member, channels are defined between said first annular members and between said first annular members and said second annular member.
5. The head drum assembly of a VCR as claimed in claim 3 characterized in that a plurality of electric coils are arranged in each of the channels.
6. The head drum assembly of a VCR as claimed in claim 3, characterized in that said rocary transformer section can be formed in such a manner that said first annular members, a number of which are the same as a timber of said heads mounted on said rotary head drum, and said second annular member are incorporated with each other.
7. A head drum assembly constructed and arranged substantially as herein described with reference to or as shown in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950062760A KR0174475B1 (en) | 1995-12-29 | 1995-12-29 | Head drum of a tape recorder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9626863D0 GB9626863D0 (en) | 1997-02-12 |
| GB2308749A true GB2308749A (en) | 1997-07-02 |
Family
ID=19446339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9626863A Withdrawn GB2308749A (en) | 1995-12-29 | 1996-12-24 | Cylindrical rotary transformer including stacked annular core members |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH09190602A (en) |
| KR (1) | KR0174475B1 (en) |
| GB (1) | GB2308749A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723185A (en) * | 2012-06-06 | 2012-10-10 | 哈尔滨工业大学 | Double-channel axial magnetic circuit reluctance type rotary transformer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2058474A (en) * | 1979-08-31 | 1981-04-08 | Westinghouse Electric Corp | Inductive coupler |
| EP0510926A2 (en) * | 1991-04-26 | 1992-10-28 | Matsushita Electric Industrial Co., Ltd. | Rotary transformer |
| EP0681305A1 (en) * | 1994-05-03 | 1995-11-08 | Lg Electronics Inc. | Rotary transformer and method for fabricating the same |
-
1995
- 1995-12-29 KR KR1019950062760A patent/KR0174475B1/en not_active IP Right Cessation
-
1996
- 1996-12-24 GB GB9626863A patent/GB2308749A/en not_active Withdrawn
- 1996-12-27 JP JP8349995A patent/JPH09190602A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2058474A (en) * | 1979-08-31 | 1981-04-08 | Westinghouse Electric Corp | Inductive coupler |
| EP0510926A2 (en) * | 1991-04-26 | 1992-10-28 | Matsushita Electric Industrial Co., Ltd. | Rotary transformer |
| EP0681305A1 (en) * | 1994-05-03 | 1995-11-08 | Lg Electronics Inc. | Rotary transformer and method for fabricating the same |
Non-Patent Citations (2)
| Title |
|---|
| Patent Abstracts of Japan, vol 17, no 683 (E-1477), JP 050234767 A (NEC CORP), 10.09.93 * |
| Patent Abstracts of Japan, vol 8, no 66 (E-234), JP 580218105 A (TDK), 19.12.83 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723185A (en) * | 2012-06-06 | 2012-10-10 | 哈尔滨工业大学 | Double-channel axial magnetic circuit reluctance type rotary transformer |
| CN102723185B (en) * | 2012-06-06 | 2014-02-05 | 哈尔滨工业大学 | Double-channel axial magnetic circuit reluctance type rotary transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| KR0174475B1 (en) | 1999-04-15 |
| GB9626863D0 (en) | 1997-02-12 |
| JPH09190602A (en) | 1997-07-22 |
| KR970050243A (en) | 1997-07-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |