CN1174425C - Device for recording and playback of video tape - Google Patents
Device for recording and playback of video tape Download PDFInfo
- Publication number
- CN1174425C CN1174425C CNB991213459A CN99121345A CN1174425C CN 1174425 C CN1174425 C CN 1174425C CN B991213459 A CNB991213459 A CN B991213459A CN 99121345 A CN99121345 A CN 99121345A CN 1174425 C CN1174425 C CN 1174425C
- Authority
- CN
- China
- Prior art keywords
- video
- circuit board
- frequency transformer
- district
- power circuit
- 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.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/782—Television signal recording using magnetic recording on tape
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/12—Disposition of constructional parts in the apparatus, e.g. of power supply, of modules
- G11B33/121—Disposition of constructional parts in the apparatus, e.g. of power supply, of modules the apparatus comprising a single recording/reproducing device
- G11B33/122—Arrangements for providing electrical connections, e.g. connectors, cables, switches
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
- Magnetic Heads (AREA)
- Television Receiver Circuits (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Dc-Dc Converters (AREA)
Abstract
To make it possible to control the moisture in the material in the construction stage, the fabrication stage or the like, and prevent generation of cracks and the dimensional deflection caused by decrease of the moisture after the lumber sawing, construction, fabrication or the like in the state of high moisture by achieving correct measurement of the moisture in the material such as wood and concrete which may affect the construction, the fabrication or the like, as an average value of the entire material. A moisture meter consisits of a plurality of sensors 8, 9, 10 for different measurement depths, a multiplexer 11 to receive the measured signal from the sensors, an A/D converter 12 to implement A/D conversion of the signal of the multiplexer 11, a calculating device 13 to calculate the moisture value on the basis of the signals from a plurality of sensors 8, 9, 10 which are A/D converted by the A/D converter 12, and a display device 14 to display the moisture value calculated by the calculating device 13.
Description
The present invention relates to a kind of electronic component that will form the video-tape circuit and be contained in the recording/displaying device of the video-tape on the printed circuit board with power circuit.
So far, in the recording/displaying device of the video-tape of routine, video circuit and power circuit are installed on the independent printed circuit board (PCB) separately, and the distance that it is suitable that two boards is spaced is placed, to avoid the noise that power transformer produces, the influence of heat and magnetic flux.
Because this kind layout, require complicated wiring, with being connected between the printed circuit board (PCB) of realizing being equipped with video circuit and the printed circuit board (PCB) that power circuit is housed.
And the wiring of these complexity increases the incidence of unfavorable noise.
Moreover, because will fix many terminals, can expect in order to said wiring on the connection printed circuit board (PCB), owing to increase the parts and the frock step of some necessity, and cause the rising of cost, reduced the reliability of device performance relatively.
Consider said circumstances, exploitation the present invention adopts video circuit and power circuit are contained on the printed circuit board, provides a kind of recording/displaying device that can avoid the video-tape of noise, heat and magnetic flux influence that power circuit produces to reach.
Be characterised in that according to the recording/displaying device of video-tape of the present invention this device comprises one and has for the specific region of assembling power circuit and be the printed circuit board (PCB) of the specific region of assembling video circuit, said last zone is assembled with the electronic component that constitutes power circuit, and one zone, said back is assembled with the electronic component that constitutes voicefrequency circuit.
Said power circuit is made of switch voltage-stabilizing circuit, is provided with a high-frequency transformer therein, and it produces the logical parallel said printed circuit board (PCB) in iron core gap surface of high-frequency magnetic leakage and places, and civilian ac power supply terminal is located in it.
And the terminals of tuner, intermediate frequency amplifier and radio-frequency converter are placed on a back zone of said printed circuit board (PCB).
Recording/displaying device according to video-tape of the present invention, when the electronic component of the electronic component of said video circuit and switching power supply circuit is assembled in the zones of different of a said printed circuit board separately, after the performance of consideration near the electronic component of the fringe region of the power circuit of said generation noise, heat and high frequency magnetic flux, make the best position of decision element, and with their closely assembling become possibility.
Moreover, when the wiring between said video circuit of connection and the power circuit substitutes with P.e.c., just no longer need to connect the terminals of said wiring.
And when the surface of the iron core gap of the high-frequency transformer of said switch voltage-stabilizing circuit is when being parallel to said printed circuit board (PCB) and placing, the high frequency magnetic flux that spills from said iron core gap just is not parallel to the component of said printed panel.
On the other hand, video heads easily affected by magnetic fields has the surface between the iron core gap of the horizonal base plate that is generally perpendicular to fixing said video component frame.
By convention, said framework soleplate is parallel to said printed circuit board (PCB) to be placed, and the surface between said video heads iron core gap is approximately perpendicular to said circuit board.So the magnetic leakage flux that is received by said video heads that is produced by said high-frequency transformer becomes minimum, it is minimum that the noise that is produced also becomes.
Fig. 1 is the back pseudosection of this device.
Fig. 2 is mounted in the front view of the high-frequency transformer in the said device of Fig. 1.
Fig. 3 is the side view that is placed in the high-frequency transformer in the device shown in Figure 1.
The explanation of reference number
11: the shell of device
11a: the base plate of shell 11
14: printed circuit board (PCB)
14a: power circuit zone
14b: video circuit zone
141,142: the guide rail of printed circuit board (PCB)
15: the frame that the video element parts are installed
151,152: the guide rail that frame is installed
16: high-frequency transformer
17: video-tape inserts mouth
18: barricade
19: the video heads tube
30: transformer coil
31: transformer core
32: iron core gap
33: the high frequency magnetic flux
Fig. 1 is the cut-open view that embodies the recording/displaying device of video-tape of the present invention.In the figure, express the shell 11 of this device, the base plate 11a of this shell, printed circuit board (PCB) 14, this plate 14 is the specific region 14a of assembling power circuit, and this plate 14 is assembling video circuit specific region 14b, and the guide rail 141 and 142 in order to said printed circuit board (PCB) to be installed.
And the frame 15 that the video element parts are installed is put said frame 15 guide rail 151 and 152 of said shell into, and high-frequency transformer 16, video-tape insert mouthfuls 17, and barricade 18 and video heads tube 19 also are shown among Fig. 1.The guide rail 141,142nd of said rack rail 151,152 and said printed circuit board (PCB), integrally formed with the header board (not being shown in Fig. 1) of said shell 11 with label, settle in order that be parallel to said base plate 11a.
In the embodiment shown in fig. 1, the 1/5 area 14a that occupies from said printed circuit board (PCB) left end is the power circuit zone, and occupying all the other area 14B of 4/5 is video circuit zones.
The regional 14a of said power circuit is equipped with switch voltage-stabilizing circuit, and high-frequency transformer 16 also is installed in it.
The front view of said high-frequency transformer 16 is shown in Fig. 2.Its side view is shown in Fig. 3.In these figure, the coil of the said transformer 16 of label 30 representatives, the iron core gap of the iron core of the said transformer 16 of label 31 expressions, the said iron core 31 of label 32 expressions, the high frequency magnetic flux that label 33 expressions are produced by said iron core gap 32.
In Fig. 1, when the iron core gap 32 of said high-frequency transformer 16 is when being parallel to printed circuit board (PCB) 14 and laying, said high frequency magnetic flux is only perpendicular to the component of said printed circuit board (PCB) 14, and is not parallel to the component of this plate 14.
On the other hand, being parallel to said circuit board 14 settles and is equipped with the frame of video organ and have a video tube 19.Reception is stored in around two magnetic head iron core gaps of the vision signal in the tape of said video tube 19 and settles approximately perpendicular to the surface of said frame 15.Therefore, said magnetic head does not almost receive magnetic flux perpendicular to said frame face.
Therefore, because the high frequency magnetic flux that said magnetic head receives becomes minimum, so said high-frequency transformer 16 is assembled on the printed circuit board closely with said video heads tube 19.
As mentioned above, adopt the present invention, can obtain following optimum efficiency.
The iron core gap that is installed in the high frequency transformer in the Type of Switch Stabilivolt Source Circuit is parallel to Said printed circuit board (PCB) is placed, and reduces the impact to said video head as far as possible, then can Power circuit and said video circuit closely are assembled in the list of a printed circuit board In only zone, and substituted the wiring that connects said power circuit and said video circuit, Comprise the terminals relevant with printed circuit. The result who arranges like this can be because of required parts Number and reducing of frock time and realize reducing cost, and the reliability of increase device. Simultaneously, Realized the close arrangement of the electronic component of video circuit.
Claims (5)
1. video-unit comprises:
A circuit board;
Supply unit in power circuit district that is installed in described circuit board except having disposed described power circuit district, also comprises the district of another assembling video circuit on the described circuit board;
A frame, on described frame, each component of described video-unit is contained on the described circuit board abreast, and the described component of described video-unit comprises a video heads tube; It is characterized in that,
A high-frequency transformer that is installed in described power circuit district, iron core and interferric space have been disposed with elementary winding and secondary winding, there is not magnetic shielding between this high-frequency transformer and this video heads tube, described interferric space is comprised in the plane, and this plane that comprises described interferric space is parallel with described circuit board.
2. video-unit comprises:
A circuit board;
Supply unit in power circuit district that is installed in described circuit board except having disposed described power circuit district, also comprises the district of another assembling video circuit on the described circuit board;
A frame, on described frame, each component of described video-unit is contained on the described circuit board abreast, and the described element of described video-unit comprises the video heads tube, described video heads tube contains a gap, and this gap is responsive to detecting along the magnetic line of force of first direction; It is characterized in that,
One is installed in the high-frequency transformer that produces the magnetic line of force in the described power circuit district, iron core and interferric space have been disposed with elementary winding and secondary winding, described interferric space is comprised in the plane, this plane that comprises described interferric space is parallel with described circuit board, determine the orientation of described high-frequency transformer, make the magnetic line of force that described high-frequency transformer produced along perpendicular to described first direction the second direction circulation.
3. according to the video-unit of claim 2, it is characterized in that the orientation of described high-frequency transformer is configured to make described video heads tube to minimize from the noise content that described high-frequency transformer received.
4. according to the video-unit of claim 2, it is characterized in that described high-frequency transformer is installed in the described power circuit district, do not have magnetic shielding between this high-frequency transformer and this video heads tube.
5. according to the video-unit of claim 3, it is characterized in that described high-frequency transformer is installed in the described power circuit district, between described high-frequency transformer and the described video heads tube without any magnetic shielding.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992004159U JP2571891Y2 (en) | 1992-01-10 | 1992-01-10 | Video tape recording and playback device |
| JP4159/1992 | 1992-01-10 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93101184A Division CN1053311C (en) | 1992-01-10 | 1993-01-09 | Video tape recording and regenerating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1258076A CN1258076A (en) | 2000-06-28 |
| CN1174425C true CN1174425C (en) | 2004-11-03 |
Family
ID=11576970
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93101184A Expired - Fee Related CN1053311C (en) | 1992-01-10 | 1993-01-09 | Video tape recording and regenerating device |
| CNB991213459A Expired - Fee Related CN1174425C (en) | 1992-01-10 | 1999-10-08 | Device for recording and playback of video tape |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93101184A Expired - Fee Related CN1053311C (en) | 1992-01-10 | 1993-01-09 | Video tape recording and regenerating device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2571891Y2 (en) |
| KR (1) | KR0160790B1 (en) |
| CN (2) | CN1053311C (en) |
| MY (1) | MY112230A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4447837A (en) * | 1981-02-18 | 1984-05-08 | Canon Kabushiki Kaisha | Video recording system |
-
1992
- 1992-01-10 JP JP1992004159U patent/JP2571891Y2/en not_active Expired - Lifetime
-
1993
- 1993-01-08 MY MYPI93000035A patent/MY112230A/en unknown
- 1993-01-09 KR KR1019930000236A patent/KR0160790B1/en not_active IP Right Cessation
- 1993-01-09 CN CN93101184A patent/CN1053311C/en not_active Expired - Fee Related
-
1999
- 1999-10-08 CN CNB991213459A patent/CN1174425C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| MY112230A (en) | 2001-05-31 |
| CN1053311C (en) | 2000-06-07 |
| CN1258076A (en) | 2000-06-28 |
| CN1076823A (en) | 1993-09-29 |
| JP2571891Y2 (en) | 1998-05-20 |
| KR0160790B1 (en) | 1998-12-15 |
| KR930016947A (en) | 1993-08-30 |
| JPH0559697U (en) | 1993-08-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20041103 Termination date: 20100209 |