JPS61195554U - - Google Patents
Info
- Publication number
- JPS61195554U JPS61195554U JP5780785U JP5780785U JPS61195554U JP S61195554 U JPS61195554 U JP S61195554U JP 5780785 U JP5780785 U JP 5780785U JP 5780785 U JP5780785 U JP 5780785U JP S61195554 U JPS61195554 U JP S61195554U
- Authority
- JP
- Japan
- Prior art keywords
- head
- recording mode
- switching circuit
- polarity
- 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.)
- Granted
Links
- 230000007774 longterm Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Description
第1図は本考案の一実施例を示す回路ブロツク
図、第2図は同要部波形説明図であり、第3図は
従来回路の回路ブロツク図、第4図は同要部波形
説明図であり、第5図は本考案のヘツド配置を示
す模式的説明図を、それぞれ示す。
11……第1極性反転回路、12……第2極性
反転回路、1……(第1)位相比較回路、DM…
…ドラムモータ、SA,SB……標準録再ビデオ
ヘツド、LA,AB……長時間録再ビデオヘツド
。
Fig. 1 is a circuit block diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram of waveforms of the same main part, Fig. 3 is a circuit block diagram of a conventional circuit, and Fig. 4 is an explanatory diagram of waveforms of the main part of the same. and FIG. 5 is a schematic explanatory diagram showing the head arrangement of the present invention. 11...First polarity inversion circuit, 12...Second polarity inversion circuit, 1...(first) phase comparison circuit, DM...
...Drum motor, SA, SB...Standard recording/playback video head, LA, AB...Long time recording/playback video head.
Claims (1)
し逆アジマスの長時間録再ビデオヘツドを近接配
置して成るビデオテープレコーダに於て、 ヘツドドラムモータ側の位相比較回路の基準入
力側と比較入力側に、標準記録モードと長時間記
録モードとの記録モード切換に伴い入力信号の極
性を反転する第1極性切換回路と第2極性切換回
路をそれぞれ配し、前記第1極性切換回路出力を
コントロールヘツドに供給することを特徴とする
サーボ回路。[Claims for Utility Model Registration] In a video tape recorder in which a long-time recording/playback video head with an opposite azimuth is placed close to a standard recording/playback video head with a different azimuth, a phase comparison circuit on the head drum motor side. A first polarity switching circuit and a second polarity switching circuit for inverting the polarity of the input signal upon switching the recording mode between the standard recording mode and the long-term recording mode are respectively disposed on the reference input side and comparison input side of the A servo circuit characterized by supplying a unipolarity switching circuit output to a control head.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5780785U JPH0538423Y2 (en) | 1985-04-18 | 1985-04-18 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5780785U JPH0538423Y2 (en) | 1985-04-18 | 1985-04-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61195554U true JPS61195554U (en) | 1986-12-05 |
JPH0538423Y2 JPH0538423Y2 (en) | 1993-09-29 |
Family
ID=30582689
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5780785U Expired - Lifetime JPH0538423Y2 (en) | 1985-04-18 | 1985-04-18 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0538423Y2 (en) |
-
1985
- 1985-04-18 JP JP5780785U patent/JPH0538423Y2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0538423Y2 (en) | 1993-09-29 |