JPS6194202A - Rotary head device for magnetic recording and reproducing device - Google Patents

Rotary head device for magnetic recording and reproducing device

Info

Publication number
JPS6194202A
JPS6194202A JP59215406A JP21540684A JPS6194202A JP S6194202 A JPS6194202 A JP S6194202A JP 59215406 A JP59215406 A JP 59215406A JP 21540684 A JP21540684 A JP 21540684A JP S6194202 A JPS6194202 A JP S6194202A
Authority
JP
Japan
Prior art keywords
signal
tooth
rectifying
signal generating
generating means
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.)
Pending
Application number
JP59215406A
Other languages
Japanese (ja)
Inventor
Kimimasa Shibata
柴田　公正
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP59215406A priority Critical patent/JPS6194202A/en
Publication of JPS6194202A publication Critical patent/JPS6194202A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/12—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams
    • G11B15/14—Masking or switching periodically, e.g. of rotating heads

Landscapes

  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

PURPOSE:To supply the power to a revolving preamplifying means with high stability and high reliability by rectifying the AC signal produced from an AC signal generating means by means of a rectifying means when a video head is revolving and stabilizing the output of rectification to apply it to the power supply of the preamplifying means. CONSTITUTION:A recessed/projected tooth is provided at the lower outer circumfer ential part of an inner tooth 34 of an AC signal generating means which is fixed to a thrust holding tool 9 with a screw 35 together with a rotor 11 of a motor. While an outer tooth 38 of said signal generating means is provided at the outer circumferen tial part and opposite to the recessed/projected tooth of the inner tooth 34. The outer side of the tooth 38 is adhered to a motor cover 39, and the tooth 38 also has a recessed/projected tooth at the inner side of the tooth 38. The lead wires 41 and 41' led into a pierced hole of a hollow rotary shaft 33 are connected to an AC signal rectifying means 42 through repeating terminals 40 and 40'. The rectifying means 42 is formed at a part of a circuit base board 29 fixed to the upper side of a rotary cylinder 4 and rectifies the applied AC signal by the rectifying function of a diode and a capacitor. Thus the AC signal is stabilized to the prescribed DC voltage and applied to the power supply of a preamplifying means 31.

Description

【発明の詳細な説明】 産業上の利用分野　　　　　　゛ 本発明は、磁気記録再生装置（以下ＶＴＲど称する。）
の回転ヘッド装置に関する。[Detailed Description of the Invention] Industrial Application Field The present invention is directed to a magnetic recording/reproducing device (hereinafter referred to as VTR).
The present invention relates to a rotating head device.

従来例の構成とその問題点 従来よりＶＴＲの回転ベッド装置は、回転しているビデ
オヘッドからの再生信号をビデオヘッドと共に回転する
一次側の回転トランスに加え、これに対応した固定二次
側からＶＴＲの前置増幅器に加える構成が一般的であっ
た。Conventional configuration and its problems Traditionally, rotating bed devices for VTRs have been known to apply playback signals from a rotating video head to a rotating transformer on the primary side that rotates together with the video head, and from a corresponding fixed secondary side. A common configuration was to add it to a VTR preamplifier.

近年ＶＴＲは高密度記録化及び小型軽量化が進行し、回
転ヘッド装置に前置増幅器を内蔵させ、ビデオヘッドと
直接結合し、ビデオヘッドと共に回転させる構成の回転
ヘッド装置が提供されている。以下従来例について図面
を用いて記述する。In recent years, VTRs have become more compact and lightweight with higher recording density, and rotary head devices have been provided in which a preamplifier is built into the rotary head device, and the rotary head device is directly connected to the video head and rotated together with the video head. A conventional example will be described below using drawings.

第１図は、従来例の回転ヘッド装置の断面図を示し、１
はビデオヘッドで、磁気テープ（図示せず）から記録信
号を再生可能である。２はへラドベースで先端にビデオ
ヘッド１を接着固定し、ビス３で回転シリンダー４の下
端に固定されている。FIG. 1 shows a cross-sectional view of a conventional rotary head device.
is a video head capable of reproducing recorded signals from a magnetic tape (not shown). A video head 1 is adhesively fixed to the tip of a helad base 2, which is fixed to the lower end of a rotary cylinder 4 with a screw 3.

５は固定下シリンダーで外周面に磁気テープを案内可能
である。６は回転ディスクで、中心部の回転軸７に固定
され、軸受け８．８′に支持されて回転自在である。９
は回転軸７の下端部にビス１０で締め付は固定されたス
ラスト止め具、１１はスラスト止め具９にビス１２で締
め付は固定された電動機のローター、１３は電動機のロ
ーターに接着固定されたマグネット、１４は電動機のス
テーターコイルで、通電すればローター１３に回転力が
発生する。１５は回転ディスク６と軸受け８との間のス
ペーサー、１６は回転シリンダー４を回転ディスク６に
締め付は固定するビス、１７は回転ディスク６の下方部
に接着固定された回転トランスの一次側コアーで、ビデ
オヘッド１及びビデオヘッド１に対し１０００離間して
設けられたビデオヘッド１′（図示せず）のそれぞれの
巻線と接続された一次巻線を溝部に有している。１８は
回転トランスの一次側コアー１７に対向して固定下シリ
ンダ−６の内部に接着固定された回転トランスの二次側
コアーで、溝部には二次巻線が設けられている。１９は
スペーサー２０を介してビス２１で回転ディスク６の上
端部に締め付は固定されたスリップリング取付は具、２
２はスリップリングの電極２３．２４を絶縁保持するス
リップリング保持具で、スリップリング取付は具１９に
接着固定されている。２５．２６はスリップリングの電
極２３．２４に対応して接触しているブラシ、２７はブ
ラシ２５．２６を絶縁保持するブラシ保持具　　　　−
で、ＶＴＲ本体のブラシ取付は板２８に接着固定されて
いる。２９はビス３ｏで回転シリンダー４の上方部に固
定された回路基板、３１は回路基板２９に構成された前
置増幅手段で、ビデオヘッド１．１′からの再生信号を
個々に増幅して、回転トランスの一次側コアー１７の一
次巻線に加わる。5 is a fixed lower cylinder capable of guiding a magnetic tape on its outer peripheral surface. Reference numeral 6 denotes a rotating disk, which is fixed to a rotating shaft 7 at the center and is rotatable by being supported by bearings 8 and 8'. 9
11 is a thrust stopper fixed to the lower end of the rotating shaft 7 with a screw 10, 11 is an electric motor rotor fixed to the thrust stopper 9 with a screw 12, and 13 is an electric motor rotor fixed with adhesive. The magnet 14 is a stator coil of an electric motor, and when energized, rotational force is generated in the rotor 13. 15 is a spacer between the rotating disk 6 and the bearing 8; 16 is a screw that tightens and fixes the rotating cylinder 4 to the rotating disk 6; 17 is the primary core of the rotating transformer adhesively fixed to the lower part of the rotating disk 6. The groove has a primary winding connected to each winding of the video head 1 and a video head 1' (not shown) provided 1000 mm apart from the video head 1. Reference numeral 18 denotes a secondary core of the rotary transformer which is adhesively fixed inside the fixed lower cylinder 6 opposite to the primary core 17 of the rotary transformer, and a secondary winding is provided in the groove. Reference numeral 19 denotes a slip ring mounting tool which is fastened to the upper end of the rotating disk 6 with a screw 21 via a spacer 20;
Reference numeral 2 denotes a slip ring holder for insulating and holding the electrodes 23 and 24 of the slip ring, and the slip ring is fixed to the fitting 19 with adhesive. Reference numerals 25 and 26 are brushes corresponding to and in contact with the electrodes 23 and 24 of the slip ring, and 27 is a brush holder that holds the brushes 25 and 26 insulated.
The brush mounting on the VTR body is adhesively fixed to the plate 28. 29 is a circuit board fixed to the upper part of the rotary cylinder 4 with a screw 3o, 31 is a preamplifier configured on the circuit board 29, and individually amplifies the reproduced signals from the video head 1.1'. It is added to the primary winding of the primary core 17 of the rotating transformer.

次に第２図は、従来例の回転ヘッド装置におけるビデオ
ヘッド１．１′からの再生信号の流れを示す結線図を示
し、ビデオヘッド１及び１′からの再生信号は、回路基
板２９に構成された前置増幅手段３１に加えられ、所定
の信号処理が成され、回転トランスの一次側コアー１７
の溝部に設けられている一次巻線１７ａ、１７ｂに加わ
り、回転トランスの二次側コアー１８の溝部に設けられ
ている二次巻線１８ａ、１８ｂに出力し、後続の信号処
理回路に加わる。Next, FIG. 2 shows a wiring diagram showing the flow of reproduction signals from video heads 1.1' in a conventional rotary head device. is added to the preamplification means 31, which performs predetermined signal processing, and is applied to the primary core 17 of the rotating transformer.
The signal is applied to the primary windings 17a, 17b provided in the groove of the rotary transformer, and is output to the secondary windings 18a, 18b provided in the groove of the secondary core 18 of the rotary transformer, and is added to the subsequent signal processing circuit.

前置増幅手段３１を動作させる為の電源は、スリップリ
ングの電極２３．２４に接触しているブラシ２５．２６
を通じて＋ｖｃｃ、ＧＮＤがそれぞれ供給される構成で
ある。第２図の破線３２で囲まれた部分は回転シリンダ
ー４とともに回転し、破線３２の外部は固定部を示す。The power supply for operating the preamplifier means 31 is provided by brushes 25, 26 which are in contact with the electrodes 23, 24 of the slip ring.
In this configuration, +vcc and GND are respectively supplied through the terminal. The portion surrounded by a broken line 32 in FIG. 2 rotates together with the rotating cylinder 4, and the area outside the broken line 32 indicates a fixed portion.

次に、第１図、第２図の従来例における動作は、ＶＴＲ
を再生状態にすれば、１４の電動機ステーターコイルが
通電され、ローター１３に回転力が発生し、ローター１
３に固定されたスラスト止め具９９回転軸７９回転ディ
スク６、回転トランスの一次側コアー１７９回転シリン
ダー４．ビデオへしド１，１’、スリップリングの電極
２３　、２４等の回転軸に固定された部分が回転する。Next, the operation in the conventional example shown in FIGS. 1 and 2 is as follows.
When the motor is put into the regeneration state, the 14 motor stator coils are energized, a rotational force is generated in the rotor 13, and the rotor 1
Thrust stop 99 fixed to 3. rotating shaft 79 rotating disk 6, primary core 179 of rotating transformer rotating cylinder 4. Portions fixed to the rotating shaft, such as the video shields 1 and 1' and the slip ring electrodes 23 and 24, rotate.

そして、スリップリングの電極２３．２４に対応して接
触しているブラシ２５．２６を通じて前置増幅手段３１
に＋ｖｃｃとＧＮＤの電源が供給され、前置増幅手段３
１が動作状態に至シ、ビデオヘッド１゜１′からの再生
信号を個々に増幅して、回転トランスの一次側コアー１
７の一次巻線１７ａ、１７ｂに加わり、これに対応した
二次側コアー１８の二次巻線１８ａ、１８ｂに出力し、
後続の信号処理回路に加わる。and the preamplifying means 31 through the brushes 25.26 correspondingly in contact with the electrodes 23.24 of the slip ring.
+vcc and GND power are supplied to the preamplifier 3.
1 comes into operation, the playback signals from the video heads 1゜1' are individually amplified, and the primary core 1 of the rotating transformer is
7 and outputs to the corresponding secondary windings 18a and 18b of the secondary core 18,
Participates in the subsequent signal processing circuit.

以上、記述した従来例の回転ヘッド装置では、前置増幅
手段３１を動作させる為の電源をスリップリングの電極
２３．２４に対応して接触しているブラシ２５．２６を
通じて供給する構成であるから、ＶＴＲの再生状態にお
いて、ビデオヘッド１．１′とともにスリップリングの
電極２３　、２４も回転し、これに対応しているブラシ
２５．２６はスリップリングの電極２３．２４に対して
回転接触することになる。In the conventional rotary head device described above, the power for operating the preamplifier means 31 is supplied through the brushes 25, 26 that are in contact with the electrodes 23, 24 of the slip ring. , in the playback state of the VTR, the slip ring electrodes 23, 24 also rotate together with the video head 1.1', and the corresponding brushes 25.26 come into rotational contact with the slip ring electrodes 23.24. become.

従って、ＶＴＲの長時間再生状態において、回転してい
るスリップリングの電極２３．２４とブラシ２５．２６
との接触部分が摩耗することや、接触部分に空気中のゴ
ミ、ホコリ等が付着し、スリップリングの電極２３．２
４とブラシ２５．２６との電気的接触状態が変化し、前
置増幅手段３１に安定した電源供給が行なえない等の理
由により、ＶＴＲの信頼性を低下させる原因に成ってい
た。Therefore, in the long-time playback state of the VTR, the rotating slip ring electrodes 23, 24 and brushes 25, 26
The slip ring's electrode 23.2 may wear out, or dirt and dust in the air may adhere to the contact portion.
4 and the brushes 25 and 26 changes, and a stable power supply cannot be provided to the preamplifier means 31, resulting in a decrease in the reliability of the VTR.

また、近年ＶＴＲの高密度記録化及び高品質化が進行し
、例えばＮＴＳＣ信号の約２倍の水平走査線を有する高
品位ＶＴＲや、ＮＴＳＣ信号をＡ／Ｄ変換して磁気テー
プにデジタル記録するデジタルＶＴＲにおける回転ヘッ
ド装置は、従来の回転ヘッド装置のビデオヘッド回転数
に対して４倍〜５倍以上で高速回転することが要求され
ている。これらの高速回転に対応したＶＴＲの回転ヘッ
ド装置に、前述したスリップリング２３．２４とブラシ
２５．２６との接触による電源供給を行なった場合には
、スリップリング２３．２４とブラシ２５．２６とが高
速回転接触する為に、それぞれの摩耗時間が短くなり、
ＶＴＲの信頼性をより低下させる等の欠点があった。In addition, in recent years, VTRs have become more densely recorded and have higher quality. For example, high-quality VTRs have about twice as many horizontal scanning lines as NTSC signals, and NTSC signals are A/D converted and digitally recorded on magnetic tape. The rotary head device in a digital VTR is required to rotate at a high speed of 4 to 5 times or more than the video head rotation speed of a conventional rotary head device. When power is supplied to the rotary head device of a VTR compatible with these high-speed rotations through contact between the slip ring 23.24 and the brush 25.26, the slip ring 23.24 and the brush 25.26 Because of the high-speed rotating contact, the wear time of each is shortened,
This had drawbacks such as lowering the reliability of the VTR.

発明の目的 本発明は、前述した従来の回転ヘッド装置の欠点を除去
し、回転している前置増幅手段に安定で信頼性の高い電
源供給を可能にすることにある。OBJECTS OF THE INVENTION The object of the present invention is to eliminate the drawbacks of the conventional rotating head devices mentioned above and to enable a stable and reliable power supply to rotating preamplifier means.

発明の構成 本発明は、ビデオヘッドからの再生信号を増幅する前置
増幅手段と、ビデオヘッドの回転に同期して交流信号を
発生する交流信号発生手段と、この出力信号を整流する
整流手段と、を設け、ビデオヘッド回転状態において、
交流信号発生手段から発生する交流信号を整流手段で整
流し、その出力を安定化して、前置増幅手段の電源に加
える構成の回転ヘッド装置である。Structure of the Invention The present invention comprises a pre-amplifying means for amplifying a reproduced signal from a video head, an alternating current signal generating means for generating an alternating current signal in synchronization with the rotation of the video head, and a rectifying means for rectifying this output signal. , and when the video head is rotating,
This rotary head device has a configuration in which an AC signal generated from an AC signal generating means is rectified by a rectifier, the output thereof is stabilized, and the output is applied to the power source of the preamplifier means.

実施例の説明 以下、本発明による回転ヘッド装置の一実施例を図面と
ともに述べる。尚、本発明と関係無い部分は、第１図、
第２図の従来例と同一番号、同−信号とし、重複説明を
省略する。DESCRIPTION OF EMBODIMENTS An embodiment of a rotary head device according to the present invention will be described below with reference to the drawings. In addition, parts unrelated to the present invention are shown in FIG.
The same numbers and signals are used as in the conventional example shown in FIG. 2, and redundant explanation will be omitted.

第３図は、本発明による一実施例の回転ヘッド装置の断
面図を示し、第４図は、同回転ヘッド装置の下部外観斜
視図を示す。第３図、第４図で、３３は中心部の軸長手
方向に貫通穴を有する中空回転軸で、上側の外周部に回
転ディスク６が固定され、下側の外周部にはスラスト止
め具９がビス１０で締め付は固定されている。次に交流
信号発生手段の構成を述べる。３４はビス３５で電動機
のローター１１とともにスラスト止め具９に締め付は固
定されている交流信号発生手段の内歯で、下部の外周部
に凹凸歯が設けられている。３６は円筒状のマグネット
、３γはマグネット３６の外側に設けられた交流信号発
生手段の信号検出コイルを示す。３８は交流信号発生手
段の内歯３４の凹凸歯に対向して外周部に設けられた交
流信号発生手段の外歯で、外側部は電動機カバー３９に
接着固定され、内側部には凹凸歯が設けられている。FIG. 3 shows a sectional view of a rotary head device according to an embodiment of the present invention, and FIG. 4 shows a perspective view of the lower part of the rotary head device. In FIGS. 3 and 4, reference numeral 33 denotes a hollow rotating shaft having a through hole in the longitudinal direction of the shaft in the center, a rotating disk 6 is fixed to the upper outer periphery, and a thrust stopper 9 is fixed to the lower outer periphery. is tightened with screw 10. Next, the configuration of the AC signal generating means will be described. Reference numeral 34 denotes internal teeth of the AC signal generating means which are fastened to the thrust stopper 9 together with the rotor 11 of the electric motor by screws 35, and have concave and convex teeth on the outer periphery of the lower part. Reference numeral 36 indicates a cylindrical magnet, and 3γ indicates a signal detection coil of an AC signal generating means provided outside the magnet 36. Reference numeral 38 denotes external teeth of the AC signal generating means, which are provided on the outer periphery opposite to the uneven teeth of the internal teeth 34 of the AC signal generating means. It is provided.

３９′は電動機カバー３９を固定シリンダー５に締め付
は固定するビス、４０．４０’は交流信号発生手段の信
号検出コイル３７に電気的結合された中継端子、４１．
４１’は中空回転軸３３０貫通穴に案内されたリード線
で、中継端子４０．４０’から交流信号整流手段４２に
結線されている。４２は回転シリンダー４の上側に固定
された回路基板２９の一部に構成された交流信号整流手
段で、ダイオードとコンデンサーの整流作用により、加
えられた交流信号を整流して、所定の直流電圧に安定化
し、前置増幅手段３１の電源に加える構成である。39' is a screw for tightening and fixing the motor cover 39 to the fixed cylinder 5; 40.40' is a relay terminal electrically connected to the signal detection coil 37 of the AC signal generating means; 41.
41' is a lead wire guided to the through hole of the hollow rotating shaft 330, and is connected to the AC signal rectifying means 42 from the relay terminal 40, 40'. Reference numeral 42 denotes an AC signal rectifier configured as a part of the circuit board 29 fixed on the upper side of the rotary cylinder 4, which rectifies the applied AC signal to a predetermined DC voltage using the rectifying action of a diode and a capacitor. The configuration is such that it is stabilized and added to the power supply of the preamplification means 31.

次に、第５図は、本発明の回転ヘッド装置の実施例にお
けるビデオヘッド１，１′からの再生信号及び交流信号
発生手段の信号検出コイル３７からの交流信号の流れを
示す結線図を示し、破線４３で囲まれた部分は回転シリ
ンダー４とともに回転し、破線４３の外部は固定されて
いる。第６図を用いて本発明の回転ヘッド装置の実施例
における動作を記述すると、ＶＴＲが再生状態になれば
、電動機のステーターコイルが通電されて、ローターに
回転力が発生し、これを固定している中空回転軸３３９
円筒状のマグネット３６．交流信号発生手段の信号検出
コイル３７１回転ディスク６゜回転シリンダー４．前置
増幅手段３１．交流信号整流手段４２．ビデオヘッド１
．１′等の破線４３で囲まれた部分が回転する。この回
転によって、交流信号発生手段の信号検出コイル３７に
は、交流信号発生手段の内歯３４が回転する為に、内歯
３４の外周部に設けられている凹凸部が移動し、マグネ
ット３６．信号検出コイル３７．交流信号発生手段の内
歯３４の凹凸部、固定されている外歯３８の凹凸部で構
成されている磁気回路の磁束が変化し、交流信号Ｐ０を
発生する。この交流信の両端に接続されている中継端子
４０．４０’から中空回転軸３３の貫通穴に案内された
リード線４１．４１’を通じて交流信号整流手段４２に
加わり、ダイオードとコンデンサーの整流作用で整流し
、所定の直流電圧■。に安定化し、＋ＶＣＣ。Next, FIG. 5 is a wiring diagram showing the flow of reproduction signals from the video heads 1, 1' and AC signals from the signal detection coil 37 of the AC signal generating means in an embodiment of the rotary head device of the present invention. , the part surrounded by the broken line 43 rotates together with the rotary cylinder 4, and the part outside the broken line 43 is fixed. The operation of the embodiment of the rotary head device of the present invention will be described using FIG. 6. When the VTR enters the playback state, the stator coil of the electric motor is energized, generating rotational force in the rotor and fixing it. Hollow rotating shaft 339
Cylindrical magnet 36. Signal detection coil 371 of AC signal generating means Rotating disk 6° Rotating cylinder 4. Preamplification means 31. AC signal rectification means 42. video head 1
．． The portion surrounded by a broken line 43 such as 1' rotates. Due to this rotation, since the internal teeth 34 of the AC signal generating means rotate, the concavo-convex portion provided on the outer periphery of the internal teeth 34 moves in the signal detection coil 37 of the AC signal generating means. Signal detection coil 37. The magnetic flux of the magnetic circuit made up of the uneven portions of the internal teeth 34 of the AC signal generating means and the uneven portions of the fixed external teeth 38 changes to generate an AC signal P0. The AC signal is connected to the AC signal rectifying means 42 through the lead wire 41, 41' guided to the through hole of the hollow rotary shaft 33 from the relay terminals 40, 40' connected to both ends of the AC signal, and is connected to the AC signal rectifying means 42 by the rectifying action of the diode and capacitor. Rectified, specified DC voltage■. stabilized at +VCC.

ＧＮＤ端子から出力して、前置増幅手段３１の電源に供
給される。前置増幅手段３１は、＋ＶＣＣ。It is output from the GND terminal and supplied to the power supply of the preamplifier means 31. The preamplification means 31 has +VCC.

ＧＮＤ端子に加えられた直流電圧ｖ０で動作状態に至り
、ビデオヘッド１，１′からの再生信号を個々に増幅し
て、回転トランスの一次側コアー１７の一次巻線１７ａ
、１７ｂに加わり、これに対応した二次側コアー１８の
二次巻線１８ａ、１８ｂに出力され、後続の信号処理回
路に加わる。The operating state is reached by the DC voltage v0 applied to the GND terminal, and the reproduction signals from the video heads 1 and 1' are individually amplified, and the primary winding 17a of the primary core 17 of the rotating transformer is
, 17b, and is output to the corresponding secondary windings 18a and 18b of the secondary core 18, and is added to the subsequent signal processing circuit.

発明の効果 以上述べた如く、本発明によれば、ビデオヘッドからの
再生信号を増幅する前置増幅手段と、ビデオヘッドの回
転に同期して交流信号を発生する交流信号発生手段と、
この出力信号を整流する整流手段とを設け、ビデオヘッ
ド回転状態において、交流信号発生手段から発生する交
流信号を整流手段で整流し、その出力を安定化して、前
置増幅手段の電源に加える構成であるから、従来例のス
リップリングの電極とブラシとの回転接触で、前置増幅
手段に電源供給を行なう構成の問題点を完全に除去可能
であシ、ＶＴＲの信頼性向上に寄与出来る。さらに、本
発明は高品位ＶＴＲやデジタルＶＴＲ等の高速回転型の
回転ヘッド装置に実施した場合においても、同様な効果
が得られる。Effects of the Invention As described above, according to the present invention, there are provided a pre-amplifying means for amplifying a reproduced signal from a video head, an AC signal generating means for generating an AC signal in synchronization with the rotation of the video head,
A configuration includes a rectifying means for rectifying this output signal, and when the video head is rotating, the rectifying means rectifies the AC signal generated from the AC signal generating means, stabilizes the output, and applies it to the power source of the preamplifier means. Therefore, it is possible to completely eliminate the problem of the conventional configuration in which power is supplied to the preamplifying means through rotational contact between the electrode of the slip ring and the brush, and this contributes to improving the reliability of the VTR. Furthermore, similar effects can be obtained even when the present invention is applied to a high-speed rotary head device such as a high-quality VTR or digital VTR.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来例の回転ヘッド装置の断面図、第２図は同
ビデオヘッドからの再生信号の流れを示す結線図、第３
図は本発明による一実施例の回転ヘッド装置の断面図、
第４図は同回転ヘッド装置の下部外観斜視図、第５図は
同ビデオヘッドからの再生信号及び交流信号発生手段の
信号検出コイルからの交流信号の流れを示す結線図であ
る。 １．１’−・・・・・ビデオヘッド、４・・・・・・回
転シリンダー、６・・・・・・固定シリンダー、６・・
・・・・回転ディスク、１１・・・・・・電動機のロー
ター、３１・・・・・・前置増幅手段、３３・・・・・
・中空回転軸、３４・・・・・・交流信号発生手段の内
歯、３６・・・・・・同筒状のマグネット、３７・・・
・・・交流信号発生手段の信号検出コイル、３８・−・
・・・交流信号発生手段の外歯、４２・・・・・・交流
信号整流手段。 代理人の氏名　弁理士　中　尾　敏　男　ほか１名第１
図 第３図 第４図 第５図Figure 1 is a sectional view of a conventional rotary head device, Figure 2 is a wiring diagram showing the flow of playback signals from the same video head, and Figure 3 is a wiring diagram showing the flow of playback signals from the video head.
The figure is a sectional view of a rotating head device according to an embodiment of the present invention.
FIG. 4 is a perspective view of the lower part of the rotary head device, and FIG. 5 is a wiring diagram showing the flow of the reproduction signal from the video head and the AC signal from the signal detection coil of the AC signal generating means. 1.1'-...Video head, 4...Rotating cylinder, 6...Fixed cylinder, 6...
... Rotating disk, 11 ... Rotor of electric motor, 31 ... Preamplification means, 33 ...
・Hollow rotating shaft, 34... Internal teeth of AC signal generating means, 36... Same cylindrical magnet, 37...
...Signal detection coil of AC signal generating means, 38...
. . . External teeth of AC signal generating means, 42 . . . AC signal rectifying means. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 3 Figure 4 Figure 5

Claims (1)

【特許請求の範囲】[Claims] ビデオヘッドからの再生信号を増幅する前置増幅手段と
、前記ビデオヘッドの回転により交流信号を発生する交
流信号発生手段と、前記交流信号発生手段からの出力信
号を整流する整流手段とを備え、前記ビデオヘッドの回
転状態において、前記交流信号発生手段から発生する交
流信号を前記整流手段で整流し、その出力を前記前置増
幅手段の電源に加えることを特徴とする磁気記録再生装
置の回転ヘッド装置。Preamplification means for amplifying a reproduced signal from the video head, AC signal generation means for generating an AC signal by rotation of the video head, and rectification means for rectifying the output signal from the AC signal generation means, A rotary head of a magnetic recording and reproducing apparatus, characterized in that, in a rotating state of the video head, an AC signal generated from the AC signal generating means is rectified by the rectifying means, and its output is applied to the power source of the preamplifying means. Device.
JP59215406A 1984-10-15 1984-10-15 Rotary head device for magnetic recording and reproducing device Pending JPS6194202A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59215406A JPS6194202A (en) 1984-10-15 1984-10-15 Rotary head device for magnetic recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59215406A JPS6194202A (en) 1984-10-15 1984-10-15 Rotary head device for magnetic recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS6194202A true JPS6194202A (en) 1986-05-13

Family

ID=16671795

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59215406A Pending JPS6194202A (en) 1984-10-15 1984-10-15 Rotary head device for magnetic recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS6194202A (en)

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