JPS5912766Y2 - Antistatic device for rotating drive shaft - Google Patents
Antistatic device for rotating drive shaftInfo
- Publication number
- JPS5912766Y2 JPS5912766Y2 JP12730079U JP12730079U JPS5912766Y2 JP S5912766 Y2 JPS5912766 Y2 JP S5912766Y2 JP 12730079 U JP12730079 U JP 12730079U JP 12730079 U JP12730079 U JP 12730079U JP S5912766 Y2 JPS5912766 Y2 JP S5912766Y2
- Authority
- JP
- Japan
- Prior art keywords
- drive shaft
- rotary drive
- antistatic device
- chassis
- rotating drive
- 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
Links
Landscapes
- Elimination Of Static Electricity (AREA)
Description
【考案の詳細な説明】
本考案は、ビデオテープレコーダの帯電を解消した回転
駆動軸の帯電防止機構に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an antistatic mechanism for a rotary drive shaft that eliminates static electricity in a video tape recorder.
ビデオテープレコーダはガイドシリンダ外周にテープを
周接走行せしめる関係上、第１図に図示せる如く、ガイ
ドシリンダ１周面及び該ガイドシリンダ１の間隙より僅
か突出してテープ面を走査する回転ヘッド３，３に静電
気を発生することが知られている。Since the video tape recorder runs the tape circumferentially around the outer periphery of the guide cylinder, as shown in FIG. 3. It is known that static electricity is generated.
前記ガイドシリンダ１はシャーシ２に直接固定されるた
め帯電の惧れはないが、前記回転ヘッド３，３を支持す
る回転ヘッド支持体４及び回転駆動軸５は、下部ガイド
シリンダ下方の筒部１ａに介在せしめたボールベアリン
グ６゜６によって支持され、第２図に図示せる如く該ホ
ールベアリング６．６を構成する鋼球６ａがグリースの
油膜７によって包まれ電気的な絶縁が保たれるため帯電
し易く、帯電に伴う放電即ち油膜７の絶縁破壊により静
電ノイズが記録再生画像を乱すことが知られている。Since the guide cylinder 1 is directly fixed to the chassis 2, there is no fear of charging, but the rotary head support 4 and the rotary drive shaft 5 that support the rotary heads 3, 3 are connected to the cylindrical portion 1a below the lower guide cylinder. As shown in FIG. 2, the steel balls 6a constituting the hall bearing 6.6 are surrounded by a grease film 7 to maintain electrical insulation, so that they are not electrically charged. It is known that electrostatic noise disturbs recorded and reproduced images due to discharge accompanying charging, that is, dielectric breakdown of the oil film 7.
そこで、従来は、静電ノイズ解消のため、第３図に図示
せる如く、前記回転駆動軸５の頭部に白金パナジューム
より戊るスリップリング８を導電接着材９にて固定する
と共に、前記スリップリング８に対し同じく白金パナジ
ュームより成るブラシ１０を周接せしめ、前記駆動軸５
を地絡している。Therefore, in order to eliminate electrostatic noise, conventionally, as shown in FIG. A brush 10 also made of platinum panadium is circumferentially attached to the ring 8, and the drive shaft 5
There is a ground fault.
しかし斯る従来構成は貴金属を使用する関係上、コスト
高を伴う。However, such a conventional structure involves high costs due to the use of precious metals.
そこで、安価な金属によってスリップリングとブラシを
形成することも考えられるが、接触部に生ずる摩擦熱や
、接触部に生ずる酸化被膜によって接触抵抗が増加し、
結局帯電に伴う放電現象を招来することが確認された。Therefore, it is possible to form the slip ring and brush with inexpensive metal, but this increases contact resistance due to frictional heat generated at the contact area and an oxide film formed at the contact area.
It was confirmed that this eventually led to a discharge phenomenon due to charging.
尚前述の放電は帯電電圧５〜６■で発生するものである
。The above-mentioned discharge occurs at a charging voltage of 5 to 6 cm.
そこで本考案は、上述の点に鑑み静電ノイズが問題とな
らない程度迄放電電圧を減ずべく、放電がし易く構成し
た帯電防止装置を安価に提供せんとするものである。Therefore, in view of the above-mentioned points, the present invention aims to provide an inexpensive antistatic device configured to facilitate discharge in order to reduce the discharge voltage to such an extent that electrostatic noise does not become a problem.
以下本考案を第４図に図示せる一実施例に従い説明する
。The present invention will be explained below according to an embodiment shown in FIG.
本実施例は、従来例同様下部ガイドシリンダー下部の筒
体１ａより下方に突出する回転駆動軸５に対し、駆動ベ
ルト１１を張架せるプーリ１２とフライホイール１３を
固定しており、特徴とするところは、直径を約７μとす
る強靭な炭素の長繊維を数千本支持金具１４にかしめ、
ブラシ１５を形成し、前記フライホイール１３に周接せ
しめ前記支持金具１４を電気的に地絡せしめる点にある
。This embodiment is characterized in that, like the conventional example, a pulley 12 on which a drive belt 11 is stretched and a flywheel 13 are fixed to a rotary drive shaft 5 that protrudes downward from the cylindrical body 1a at the bottom of the lower guide cylinder. However, several thousand strong long carbon fibers with a diameter of approximately 7 μm were caulked to the support fitting 14.
A brush 15 is formed and brought into circumferential contact with the flywheel 13 to electrically ground the support fitting 14.
斯る本実施例の構成によれば、前記ブラシを構成する数
千率の炭素繊維の細い先端が前記フライホイール外周に
周接又は対向するため、放電現象が極めて生じ易い状態
となり、放電が頻繁に繰り返えされて電荷の帯電量が大
幅に減少すると共に、１回当りの放電量も減少し、静電
ノイズが記録蓋くは再生映像信号に影響を与える惧れも
全くなく解消された。According to the configuration of this embodiment, the thin tips of several thousand carbon fibers constituting the brush are in contact with or opposite to the outer periphery of the flywheel, so that a discharge phenomenon is extremely likely to occur, and discharges occur frequently. The amount of charge is significantly reduced by repeating this process, and the amount of discharge per time is also reduced, eliminating the possibility of electrostatic noise affecting the recording lid or playback video signal. .
尚本実施例ではフライホイール外周にブラシを周接せし
めたが、回転駆動軸の頭部等地の部分に周接せしめても
良いことは言を俟たない。In this embodiment, the brush is placed in contact with the outer periphery of the flywheel, but it goes without saying that the brush may be placed in contact with a portion such as the head of the rotary drive shaft.
上述せる如く、本考案によれば回転駆動軸に対して放電
路を安価に形成するため、製造コストの低減に資すると
ころ大である。As described above, according to the present invention, a discharge path can be formed at a low cost on a rotary drive shaft, which greatly contributes to reducing manufacturing costs.
第１図はガイドシリンダの構成を一部断面して示す側面
図、第２図は、第１図の要部拡大断面図、第３図は従来
の帯電防止装置の模式的な側面図、第４図は本考案の一
実施例装置の要部を模式的に示す側面図をそれぞれ顕わ
す。
主な図番の説明、１ａ・・・・・・筒部、６，６・・・
・・・ボールベアリング、５・・・・・・回転駆動軸、
４・・・・・・回転ヘッド支持体、１４・・・・・・ブ
ラシ。Fig. 1 is a side view partially showing the structure of the guide cylinder, Fig. 2 is an enlarged sectional view of the main part of Fig. 1, and Fig. 3 is a schematic side view of a conventional antistatic device. 4 each shows a side view schematically showing the main parts of an apparatus according to an embodiment of the present invention. Explanation of main drawing numbers, 1a... cylinder section, 6, 6...
... Ball bearing, 5 ... Rotation drive shaft,
4... Rotating head support, 14... Brush.
Claims (1)
ボールベアリングによって支持され回転ヘッド支持体と
共に一体回転する回転駆動軸、若くは該回転駆動軸に電
気的に接続される部品に対し、炭素の長繊維を束ねて戒
るブラシを対向蓋くは対接せしめ、該ブラシとシャーシ
を電気的に接続せしめることにより、前記回転駆動軸と
前記シャーシ間の放電路を形成することを特徴とする回
転駆動軸の帯電防止装置。The rotary drive shaft, which is supported by a ball bearing disposed inside the cylindrical part extending downward of the lower guide cylinder and rotates together with the rotary head support, or the parts electrically connected to the rotary drive shaft, is coated with carbon. Rotation characterized by forming a discharge path between the rotary drive shaft and the chassis by arranging brushes made by bundling long fibers and making them face each other or facing each other, and electrically connecting the brushes and the chassis. Antistatic device for drive shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12730079U JPS5912766Y2 (en) | 1979-09-14 | 1979-09-14 | Antistatic device for rotating drive shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12730079U JPS5912766Y2 (en) | 1979-09-14 | 1979-09-14 | Antistatic device for rotating drive shaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5644500U JPS5644500U (en) | 1981-04-22 |
| JPS5912766Y2 true JPS5912766Y2 (en) | 1984-04-17 |
Family
ID=29359163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12730079U Expired JPS5912766Y2 (en) | 1979-09-14 | 1979-09-14 | Antistatic device for rotating drive shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5912766Y2 (en) |
-
1979
- 1979-09-14 JP JP12730079U patent/JPS5912766Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5644500U (en) | 1981-04-22 |
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