JPS61196456A - Magnetic recording and reproducing device - Google Patents

Magnetic recording and reproducing device

Info

Publication number
JPS61196456A
JPS61196456A JP3583485A JP3583485A JPS61196456A JP S61196456 A JPS61196456 A JP S61196456A JP 3583485 A JP3583485 A JP 3583485A JP 3583485 A JP3583485 A JP 3583485A JP S61196456 A JPS61196456 A JP S61196456A
Authority
JP
Japan
Prior art keywords
drum
brush
conductive grease
lower drum
static electricity
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
JP3583485A
Other languages
Japanese (ja)
Inventor
Yoshikazu Nishida
西田 芳和
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP3583485A priority Critical patent/JPS61196456A/en
Publication of JPS61196456A publication Critical patent/JPS61196456A/en
Pending legal-status Critical Current

Links

Landscapes

  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

PURPOSE:To eliminate oscillation noises due to abrasion between solid bodies and a defect in grounding, etc., due to the wear of a brush, a decrease in durability, and a brush differential pressure difference by charging conductive grease in a part which is a discontinuous part of an earth path from an upper drum to the outside and rotates relatively. CONSTITUTION:The tip end part of a conductive pin 11 made of silver carbon provided atop of a brush 5 screwed into a holder drum 4 is dipped in the conductive grease reserved in a hollow part 10. Static electricity charged on the upper drum 2 having a head 7 is transferred to the conductive grease 12 in the hollow part 10 directly or through a center shaft 1 and further transferred to a lower drum 8 through the pin 11 and the drum holder 4. This lower drum 8 is fitted in a main plate 13 fixed to a chassis and the static electricity transferred to the lower drum 8 is earthed.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、磁気記録再生装置に係り、特に静電気帯電
防止に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device, and particularly to prevention of electrostatic charging.

〔従来の技術〕[Conventional technology]

従来、この種の装置として第2図に示すものがあった。 Conventionally, there has been a device of this type as shown in FIG.

(1)はドラムの中心軸、(2)はヘッド(7)を有す
るアッパードラムで、このアッパードラム(2)を中心
軸(1)に固定させ、アッパードラム(2)と、テープ
の位置決めをするリード溝を有するロアドラム(8)と
の平行度を出すためにフランジ(3)が上記中心軸(1
)に圧入さ′れている。(4)はドラム(2)、(8)
を保持するためのホルダードラムで、このホルダードラ
ム(4)からアッパードラム(2)のアースを取るため
に、ブラシ(5)がホルダードラム(4)にねじ止めし
てあり、このブラシ(5)の先端部には、導電性の良い
銀カーボン部(6) h’付設されていて、この銀カー
ボン部(6)と中心軸(1)が固体接触している。
(1) is the central axis of the drum, (2) is an upper drum with a head (7), and this upper drum (2) is fixed to the central axis (1), and the upper drum (2) and the tape are positioned. The flange (3) is aligned with the center axis (1) in order to achieve parallelism with the lower drum (8) having a lead groove.
) is press-fitted. (4) is drum (2), (8)
A brush (5) is screwed to the holder drum (4) in order to ground the upper drum (2) from this holder drum (4). A highly conductive silver carbon part (6) h' is attached to the tip of the holder, and the silver carbon part (6) and the central shaft (1) are in solid contact with each other.

つぎに、動作について説明する。ヘッド(7)を有する
アッパードラム(2)に溜まった静電気は、ねじ止めに
より固定されているフランジ(3)から、中心軸(1)
に伝わり、つぎに、と記ブラシ(5)先端部の銀カーボ
ン部(6)と中心軸(1)上端との金属接触によ□リブ
ラシ(5)へ伝わった後、ホルダードラム(4)を介し
てロアドラム(8)に伝わる。このようにしてロアドラ
ム(8)に伝わった静電気はメインプレート(至)を経
て、このメインプレート(至)が固着されているシャー
シに伝わり、アースされる。
Next, the operation will be explained. Static electricity accumulated on the upper drum (2) with the head (7) is transferred from the flange (3) fixed with screws to the central shaft (1).
Then, the metal contact between the silver carbon part (6) at the tip of the brush (5) and the upper end of the central shaft (1) causes it to be transmitted to the rebrush (5), and then the holder drum (4) is The signal is transmitted to the lower drum (8) via the signal. The static electricity transmitted to the lower drum (8) in this way is transmitted to the chassis to which the main plate (to) is fixed via the main plate (to), and is grounded.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

従来のドラム静電気帯電防止機構は、以とのように構成
されているので、ブラシ(5)先端の銀カーボン部(6
)と、ドラム(2) 、 (8)の中心軸(1)上端が
金属接触していなければならず、ブラシ(5)と中心軸
(1)間の接触圧が高くなると接触抵抗は下がり、静電
気のアッパードラム(2)への帯電を防ぐ反面、ブラシ
(5)と中心軸(1)との金属接触による振動および騒
音が大きくなる問題を生じる。一方、ブラシ(5)と中
心軸(1)間の接触圧が下がると、振動および騒音は軽
減する反面、接触抵抗の増加に伴なうアース不良を生じ
、画面上問題となるめだかノイズ等を発生しやすくなる
The conventional drum electrostatic charge prevention mechanism is constructed as follows.
) and the upper ends of the central shafts (1) of the drums (2) and (8) must be in metal contact, and as the contact pressure between the brushes (5) and the central shafts (1) increases, the contact resistance decreases. Although this prevents the upper drum (2) from being charged with static electricity, it causes a problem of increased vibration and noise due to metal contact between the brush (5) and the central shaft (1). On the other hand, when the contact pressure between the brush (5) and the center shaft (1) decreases, vibration and noise are reduced, but on the other hand, grounding failure occurs due to an increase in contact resistance, causing problems such as medaka noise on the screen. It is more likely to occur.

この発明は、上記のような従来のものの欠点を除去する
ためになされたもので、ブラシと中心軸間の金属摩擦に
よる振動騒音、ブラシの摩耗による耐久性低下およびブ
ラシ圧差によるアース不良等のブラシによって生じる欠
点を解消した磁気記録再生装置を提供することを目的と
している。
This invention was made to eliminate the above-mentioned drawbacks of the conventional brushes, such as vibration noise due to metal friction between the brush and the central shaft, reduced durability due to brush wear, and poor grounding due to the brush pressure difference. It is an object of the present invention to provide a magnetic recording/reproducing device that eliminates the drawbacks caused by the above.

〔問題点を解決するための手段〕[Means for solving problems]

この発明では、上記目的を達成するために、アッパード
ラムから外部へのアース経路の断続部分であって、相対
回転する部分に、導電性グリースを充填している。
In this invention, in order to achieve the above object, conductive grease is filled in the intermittent portions of the earth path from the upper drum to the outside and the relatively rotating portions.

〔作用〕[Effect]

上記構成により、アッパードラムから外部へのアース経
路の断続部分は導通状態となる。
With the above configuration, the interrupted portions of the ground path from the upper drum to the outside are brought into conduction.

また、ブラシを用いる場合はブラシが導電性のグリース
と接触することになり、ブラシを用いない場合と同様に
、固体接触によってひき起こされる弊害を除去すること
ができる。
Further, when a brush is used, the brush comes into contact with conductive grease, and as in the case where a brush is not used, the adverse effects caused by solid contact can be eliminated.

〔実施例〕〔Example〕

以下、この発明の一実施例を図面にしたがって説明する
An embodiment of the present invention will be described below with reference to the drawings.

第1図はこの発明の一実施例を示す断面図である。図に
おいて、αQは、中心軸(1)とフランジ(3)ト部と
の間に設けられた空所で、導電性の良いグリースが注入
されている。(ロ)はホルダードラム(4)にねじ止め
されたブラシ(5)の先端に設けられた銀カーボンから
なる導電性のピンで、このピン(ロ)の先端部は上記空
所αQに溜められた導電性グリース(2)中に浸漬され
ている。
FIG. 1 is a sectional view showing an embodiment of the present invention. In the figure, αQ is a space provided between the center shaft (1) and the flange (3), into which highly conductive grease is injected. (B) is a conductive pin made of silver carbon provided at the tip of the brush (5) screwed to the holder drum (4), and the tip of this pin (B) is stored in the above-mentioned space αQ. It is immersed in conductive grease (2).

つぎに、動作について説明する。ヘッド(7)を有する
アッパードラム(2)に溜まった静電気は上記フランジ
(3)を経て、直接、あるいは中心軸(1)を介して空
所αQの導電性グリース(ロ)に伝わる。静電気はさら
に、上記ピンa)およびホルダードラム(4)を経てロ
アドラム(8)に伝わる。このロアドラム(8)はシャ
ーシに固着されたメインプレート(至)に嵌め込まれて
おり、ロアドラム(8)に伝わった静電気は外部へ伝わ
り、アースされる。
Next, the operation will be explained. Static electricity accumulated on the upper drum (2) having the head (7) is transmitted to the conductive grease (b) in the space αQ via the flange (3), either directly or via the central shaft (1). The static electricity is further transmitted to the lower drum (8) via the pin a) and the holder drum (4). This lower drum (8) is fitted into a main plate (to) fixed to the chassis, and static electricity transmitted to the lower drum (8) is transmitted to the outside and grounded.

上記実施例では、フランジ(3)と部と中心軸(1)間
に空所a・を設け、この空所αQに導電性グリース(2
)を注入し、ブラシ(5)とフランジ(3)(あるいは
軸)との間を導通させたが、この導電性グリースをド5
 A (2)、 (8)内のベアリング(9)内に注入
すれば、ベアリング(9)を介してアッパードラム(2
)をロアドラム(8)に電気的に接続して、アッパード
ラム(2)のアースを取ることができ、この際、ブラシ
(5)は不要となる。
In the above embodiment, a space a is provided between the flange (3) and the central axis (1), and conductive grease (2) is filled in this space αQ.
) was injected to create electrical continuity between the brush (5) and the flange (3) (or shaft).
If injected into the bearings (9) in A (2) and (8), it will flow through the bearings (9) to the upper drum (2).
) can be electrically connected to the lower drum (8) to ground the upper drum (2), and in this case, the brush (5) becomes unnecessary.

〔発明の効果〕〔Effect of the invention〕

以上のように、この発明によれば、従来の銀カーボン部
を介しての固体接触が招いた弊害、すなわち、固体間の
摩擦による振動騒音、ブラシの摩耗による耐久性低下お
よびブラシ圧差によるアース不良等を解消することがで
きる。
As described above, according to the present invention, the disadvantages caused by the conventional solid contact through the silver carbon part, namely, vibration noise due to friction between solids, durability reduction due to brush wear, and grounding failure due to brush pressure difference, can be solved. etc. can be resolved.

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

第1図はこの発明の一実施例を示す縦断面図、第2図は
従来例を示す縦断面図である。 (1)・・・中心411、(2)・・・アッパードラム
、 (3)・・・フランジ、 (5)・・・ブラシ、(
7)・・・ヘッド、(8)・・・ロアドラム、(ロ)・
・・ピン、(2)・・・導電性グリース。 なお、図中、同一符号は同一または相当部分を示す。
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing a conventional example. (1)...Center 411, (2)...Upper drum, (3)...Flange, (5)...Brush, (
7)...head, (8)...lower drum, (b)...
... Pin, (2) ... Conductive grease. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] (1)ドラムに磁気テープを巻き付けて映像信号を録画
再生する磁気記録再生装置であつて、テープを外周上に
沿わせるリード溝を有するロアドラムと、ヘッドを有し
、ロアドラムに保持された軸受によつて支えられた回転
軸に固定されて回転するアッパードラムと、上記回転軸
を回転させる駆動装置とを有し、上記アッパードラムか
ら外部へのアース経路の断続部分であつて、相対回転す
る部分に、導電性のグリースが充填されていることを特
徴とする磁気記録再生装置。
(1) A magnetic recording and reproducing device that records and reproduces video signals by winding a magnetic tape around a drum, which includes a lower drum having a lead groove along the outer periphery of the tape, a head, and a bearing held by the lower drum. an upper drum that is fixed to and rotates on a rotating shaft that is supported by a rotating shaft; and a drive device that rotates the rotating shaft, and is an intermittent part of a ground path from the upper drum to the outside and that rotates relatively. A magnetic recording/reproducing device characterized in that the device is filled with conductive grease.
JP3583485A 1985-02-25 1985-02-25 Magnetic recording and reproducing device Pending JPS61196456A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3583485A JPS61196456A (en) 1985-02-25 1985-02-25 Magnetic recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3583485A JPS61196456A (en) 1985-02-25 1985-02-25 Magnetic recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS61196456A true JPS61196456A (en) 1986-08-30

Family

ID=12452994

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3583485A Pending JPS61196456A (en) 1985-02-25 1985-02-25 Magnetic recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS61196456A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5486966A (en) * 1993-08-24 1996-01-23 Daewoo Electronics Co., Ltd. Head drum ground system for use in a video cassette recorder
US5724214A (en) * 1995-11-30 1998-03-03 Daewoo Electronics Co., Ltd. Discharging device for head drum

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5486966A (en) * 1993-08-24 1996-01-23 Daewoo Electronics Co., Ltd. Head drum ground system for use in a video cassette recorder
US5724214A (en) * 1995-11-30 1998-03-03 Daewoo Electronics Co., Ltd. Discharging device for head drum

Similar Documents

Publication Publication Date Title
JP2536074B2 (en) Grounding device for rotating drum
US5729404A (en) Disc drive spindle motor with rotor isolation and controlled resistance electrical pathway from disc to ground
US3995317A (en) Helical scan apparatus for video tape or the like and having rotating-head inclination-adjustment means
JP2921967B2 (en) Disk drive with electrically isolated disk stack
JPS61196456A (en) Magnetic recording and reproducing device
KR920008413B1 (en) Rotary head apparatus and magnetic reproducing device using it
US5486966A (en) Head drum ground system for use in a video cassette recorder
JPH0452828Y2 (en)
JP2725301B2 (en) Rotary drum grounding device
KR920007998Y1 (en) Head drum for vtr
JP2921162B2 (en) Signal transmission device
JPS5912766Y2 (en) Antistatic device for rotating drive shaft
JPH0617358U (en) Antistatic structure of rotating shaft
JPH0619115U (en) Antistatic structure of rotating shaft
KR200169601Y1 (en) A gyrating structure of head drum assembly
KR200198149Y1 (en) Apparatus for oarthing a static electricty of a head drum asembly
JPH05126158A (en) Rotary bearing device
KR200303155Y1 (en) Bearing for head drum of vcr
JPH02300515A (en) Dynamic pressure gas bearing device
JP2722981B2 (en) Guide drum
KR100359937B1 (en) head drum assembly
JPH05101481A (en) Bearing device
JPH0845121A (en) Sputtering device
JPH11162040A (en) Rotary magnetic head device
JPH05101482A (en) Rotary head drum