JP2004189466A - Security camera system installed inside elevator car - Google Patents

Security camera system installed inside elevator car Download PDF

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Publication number
JP2004189466A
JP2004189466A JP2002362794A JP2002362794A JP2004189466A JP 2004189466 A JP2004189466 A JP 2004189466A JP 2002362794 A JP2002362794 A JP 2002362794A JP 2002362794 A JP2002362794 A JP 2002362794A JP 2004189466 A JP2004189466 A JP 2004189466A
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Prior art keywords
video
core
wire core
insulated wire
video signal
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JP2002362794A
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JP4205418B2 (en
Inventor
Shinichiro Yamaguchi
伸一朗 山口
Yasutaka Suzuki
靖孝 鈴木
Teruyoshi Atsuzawa
輝佳 厚沢
Sadao Hokari
定夫 保苅
Toshiki Kajiyama
俊貴 梶山
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Hitachi Ltd
Hitachi Building Systems Co Ltd
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Hitachi Ltd
Hitachi Building Systems Co Ltd
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  • Studio Devices (AREA)
  • Indicating And Signalling Devices For Elevators (AREA)
  • Cage And Drive Apparatuses For Elevators (AREA)
  • Closed-Circuit Television Systems (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a security camera system installed inside an elevator car that can ensure the anti-noise property of a multiconductor flat traveling cable with excellent flexibility. <P>SOLUTION: This security camera system installed inside an elevator car transmits a video signal from a camera 2 to a video recorder 6 via a twisted pair line 9 of a multiconductor flat traveling cable and a braid shield line 9b of the twisted pair line 9 is connected to a ground 2b on the camera 2 and a ground 6b on the video recorder 6 respectively and an insulating coating cable core 9a1 is connected to a transmission buffer 2a and a receive buffer 6a respectively with the core 9a1 but another insulating coating cable core 9a2 that is twisted with the 9a1 is not connected to either of them. Thus, a dummy coaxial cable is formed and inverter noise is blocked by the braid shield line 9b without being guided to the cable core 9a1, which enabling obtaining a good SN ratio. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、エレベータの乗かご内防犯カメラ装置に係り、特に、映像信号が多心平型移動ケーブルを介して伝送されるエレベータの乗かご内防犯カメラ装置に関する。
【0002】
【従来の技術】
近年、刑法犯の認知件数が増加の一途をたどり、なかでも路上でのひったくり、建物又は住居内での性犯罪、ピッキング用具使用の空き巣ねらい、強盗等が著しく増加するに至り、警視庁は安全・安心まちづくり推進要綱を制定し、安全に安心して暮らせる地域社会の構築を推進してきた。この動き中でビルやマンションのエレベータについては、乗かご内の防犯カメラ設置が特に実現に努めるべき事項として定められた。このため、エレベータの多くに防犯カメラが設置されるものと予想されている。そして防犯カメラ設置にあっては、防犯カメラの映像信号を映像記録機に送ったり、映像信号を表示手段に表示したりするため、何らかの映像信号伝送路を設ける必要がある。
【0003】
このために、従来、ツイストペア線等の複数の伝送線を内在する多心平型ケーブルをエレベータの移動ケーブルとして用い、前記ツイストペア線が映像信号を送信するための信号伝送路として用いられている。エレベータで使用される移動ケーブルは、乗かごの移動に伴って屈曲、捻回等の各種の機械的作用を反復して受けることから優れた屈曲特性が要求されるが、この点、開示されているツイストペア線は撚り合わせ構造を有していることから屈曲性に優れており、移動ケーブルとして適している(特許文献1参照)。
【0004】
ここで、多心平型ケーブルのツイストペア線を映像信号の信号伝送線として用いられた従来例を図に基づき説明する。
【0005】
図7はエレベータの乗かご内防犯カメラ装置の主要構成を示す構成図、図8は乗かご内防犯カメラ装置に用いられる多心平型ケーブルの断面図、図9は多心平型ケーブルに備えられるツイストペア線の拡大断面図、図10はツイストペア線の構成を示す断面図、図11は従来のツイストペア線の接続を示す構成図である。
【0006】
乗かご内防犯カメラ装置は図7に示すように、乗かご1に設置され映像出力端子を有するカメラ2と、制御盤3が設けられる昇降路4上部の機械室5に配設され映像入力端子を有する映像記録機6とを備え、カメラ2から映像信号を複数の伝送線が併設された多心平型移動ケーブル7を介して映像記録機6に伝送する。
【0007】
前記の多心平型移動ケーブル7には図8に示すように、給電線や他の一般信号線が割付けられる集合心8と、映像信号を伝送するツイストペア線9とが併設されている。
【0008】
また、前記のツイストペア線9は、図9に示すように導体90およびこの導体90を覆う絶縁体91を備えた絶縁被覆線心9a1を有している。そして、図8、10に示すように、前記のように構成される絶縁被覆線心9a1と他の絶縁被覆線心9a2が撚り合わされるとともに、この撚り合わされたそれぞれの絶縁被覆線心9a1、9a2を覆う編組遮蔽線9bと、この編組遮蔽線9bの外周を覆う保護用の被覆9cとから成っている。
【0009】
そして、前記のツイストペア線9は図11に示すように、カメラ2の映像出力端子、すなわち送信バッファ2aがコネクタ10を介して絶縁被覆線心9a1の一端に接続されるとともに、映像記録機6の映像入力端子、すなわち受信バッファ6aがコネクタ11を介して絶縁被覆線心9a1の他端に接続される。また、映像出力端子側のグラウンド2bがコネクタ10を介して絶縁被覆線心9a2の一端に接続されるとともに、映像入力端子側のグラウンド6bがコネクタ11を介して絶縁被覆線心9a2の他端に接続される。
【0010】
【特許文献1】
特開平11−185540号公報 (段落番号0013、第3図)
【0011】
【発明が解決しようとする課題】
ところで、エレベータの移動ケーブルではすべての伝送線にインバータノイズ、すなわちコモンモードノイズが誘導され、ツイストペア線9を構成するそれぞれの絶縁被覆線心9a1、9a2にも同レベルのコモンモードノイズが誘導される。しかし従来のように絶縁被覆線心9a2がグランド2b、6bに接続されている状態で映像信号のような不平衡信号が絶縁被覆線心9a1を介して伝送されると、相対的に絶縁被覆線心9a1にノーマルノイズ電圧が現れ、映像信号の通信品質、すなわちSN比を劣化させてしまう。特に、インバータ用のパワーデバイスは年々高速化されており、近年のインバータを用いたエレベータにあっては、インバータによる急峻な電圧変化によって移動ケーブルの伝送線に高レベルのノイズを誘導する現象が観測されており、通信品質が著しく劣化することが実験によっても確認されている。したがって、この問題は今後さらに顕著になってくるものと考えられる
本発明はこのような従来技術における実情に鑑みてなされたもので、その目的は、屈曲性に優れた多心平型移動ケーブルの耐ノイズ性を確保することのできるエレベータの乗かご内防犯カメラ装置を提供することにある。
【0012】
【課題を解決するための手段】
この目的を達成するために本発明の請求項1に係る発明は、乗かごに設置され映像出力端子を有するカメラと、昇降路内あるいは昇降路外に配設され前記カメラの映像信号を記録するとともに映像入力端子を有する映像記録機とを備え、前記カメラから前記映像信号を複数の伝送線が併設された多心平型移動ケーブルの映像信号伝送線を介して前記映像記録機に伝送するものであって、前記映像信号伝送線が、導体およびこの導体を覆う絶縁体を有する絶縁被覆線心と、この絶縁被覆線心と撚り合わされる他の線心と、撚り合わされた前記絶縁被覆線心および前記他の線心を覆う編組遮蔽線とを有して成るエレベータの乗かご内防犯カメラ装置において、前記映像出力端子側のグラウンドが前記編組遮蔽線の一端に接続されるとともに、前記映像入力端子側のグラウンドが前記編組遮蔽線の他端に接続され、かつ前記映像出力端子が前記絶縁被覆線心の一端に接続されるとともに、前記映像入力端子が前記絶縁被覆線心の他端に接続され、また前記他の線心が未接続とされる構成にしてある。
【0013】
本発明の請求項1に係る発明によれば、乗かごに映像出力端子を有するカメラが設置されるとともに、昇降路内あるいは昇降路外に映像入力端子を有する映像記録機が配設されたエレベータにあって、カメラから映像記録機に映像信号を伝送する多心平型移動ケーブルの映像信号伝送線は、絶縁被覆線心、他の線心および編組遮蔽線を有し成っている。そして、編組遮蔽線に映像出力端子側のグラウンドおよび映像入力端子側のグラウンドが接続されるとともに、絶縁被覆線心に映像出力端子および映像入力端子が接続され、かつ他の線心は未接続とされる。これにより擬似的な同軸ケーブルが形成されインバータノイズ、すなわちコモンモードノイズは編組遮蔽線で遮蔽されて絶縁被覆線心へ誘導されることがなく良好なSN比が得られる。したがって優れた屈曲性をもつ撚り合せ構造の伝送線を映像信号伝送線として用いても耐ノイズ性を確保することができる。
【0014】
また、本発明の請求項2記載に係る発明は、乗かごに設置されるカメラおよびこのカメラの映像信号を記録するとともに映像出力端子を有する映像記録機と、昇降路内あるいは昇降路外に配設され映像入力端子を有する表示手段とを備え、前記映像記録機から前記映像信号を複数の伝送線が併設された多心平型移動ケーブルの映像信号伝送線を介して前記表示手段に伝送するものであって、前記映像信号伝送線が、導体およびこの導体を覆う絶縁体を有する絶縁被覆線心と、この絶縁被覆線心と撚り合わされる他の線心と、撚り合わされた前記絶縁被覆線心および前記他の線心を覆う編組遮蔽線とを有して成るエレベータの乗かご内防犯カメラ装置において、前記映像出力端子側のグラウンドが前記編組遮蔽線の一端に接続されるとともに、前記映像入力端子側のグラウンドが前記編組遮蔽線の他端に接続され、かつ前記映像出力端子が前記絶縁被覆線心の一端に接続されるとともに、前記映像入力端子が前記絶縁被覆線心の他端に接続され、また前記他の線心が未接続とされる構成にしてある。
【0015】
本発明の請求項2に係る発明によれば、乗かごにカメラおよび映像出力端子を有する映像記録機が設置されるとともに、昇降路内あるいは昇降路外に映像入力端子を有する表示手段が配設されたエレベータにあって、映像記録機から表示手段に映像信号を伝送する多心平型移動ケーブルの映像信号伝送線は、絶縁被覆線心、他の線心および編組遮蔽線を有し成っている。そして、編組遮蔽線に映像出力端子側のグラウンドおよび映像入力端子側のグラウンドが接続されるとともに、絶縁被覆線心に映像出力端子および映像入力端子が接続され、かつ他の線心は未接続とされる。これにより擬似的な同軸ケーブルが形成されインバータノイズ、すなわちコモンモードノイズは編組遮蔽線で遮蔽されて絶縁被覆線心へ誘導されることがなく良好なSN比が得られる。したがって優れた屈曲性をもつ撚り合せ構造の伝送線を映像信号伝送線として用いても耐ノイズ性を確保することができる。
【0016】
さらに、本発明の請求項3記載に係る発明は、前記映像記録機に映像出力端子を備えるとともに、前記乗かご内に映像入力端子を有する他の表示手段を設け、前記多心平型移動ケーブルに併設される他の映像信号伝送線の一端を前記映像出力端子、その他端を前記映像入力端子に接続し、前記映像記録機から前記映像信号を前記他の表示手段に伝送する構成になっている。
【0017】
本発明の請求項3に係る発明によれば、一旦、乗かご側から映像信号伝送線を介して映像記録機に伝送された映像信号は、この映像記録機から他の映像信号伝送線を介して乗かご内に備えられる他の表示手段に伝送される。このとき他の映像信号伝送線は前述した映像信号伝送線と同様、その編組遮蔽線に映像出力端子側のグラウンドおよび映像入力端子側のグラウンドが接続されるとともに、絶縁被覆線心に映像出力端子および映像入力端子が接続され、かつ他の線心は未接続とされる。これにより擬似的な同軸ケーブルが形成されインバータノイズ、すなわちコモンモードノイズは編組遮蔽線で遮蔽されて絶縁被覆線心へ誘導されることがなく良好なSN比が得られる。
【0018】
【発明の実施の形態】
以下、本発明のエレベータの乗かご内防犯カメラ装置の実施の形態を図に基づいて説明する。
【0019】
図1は本発明のエレベータの乗かご内防犯カメラ装置の一実施形態を示す構成図である。なお、本実施形態の乗かご内防犯カメラ装置は前述した図7ないし図10に示すものと同等の構成を有しているのでこれらの図を参照して説明する。
【0020】
本実施形態の乗かご内防犯カメラ装置は図7に示すように、乗かご1に設置され映像出力端子を有するカメラ2と、制御盤3が設けられる昇降路4上部の機械室5に配設され映像入力端子を有する映像記録機6とを備え、カメラ2から映像信号を複数の伝送線が併設された多心平型移動ケーブル7を介して映像記録機6に伝送する。
【0021】
前記の多心平型移動ケーブル7は図8に示すように、集合心8と映像信号を伝送するツイストペア線9が併設されており、このツイストペア線9は図8ないし図10に示すように、導体90、絶縁体91を備えた絶縁被覆線心9a1、絶縁被覆線心9a1と撚り合わされる他の線心、すなわち絶縁被覆線心9a2、絶縁被覆線心9a1、9a2を覆う編組遮蔽線9b、編組遮蔽線9bの外周を覆う被覆9cから成っている。なお、前記の導体90は、集合心8を構成する絶縁被覆線の導体と同じ0.75平方mmの太さ寸法が好ましいとともに、前記の絶縁体91は高周波における誘電率の安定性を考慮するとポリエチレンが好ましい。また、前記の絶縁被覆線心9a1、9a2と編組遮蔽線9b間の特性インピーダンスは75Ωが望ましく、これは絶縁被覆線心9a1、9a2の絶縁体91の厚さ寸法、撚り合わせ間隔で調整することができる。
【0022】
そして、本実施形態の乗かご内防犯カメラ装置は図1に示すように、映像出力端子、すなわち送信バッファ2a側のグラウンド2bがコネクタ20を介して編組遮蔽線9bの一端に接続されるとともに、映像入力端子、すなわち受信バッファ6a側のグラウンド6bがコネクタ21を介して編組遮蔽線9bの他端に接続され、かつ送信バッファ2aがコネクタ20を介して絶縁被覆線心9a1の一端に接続されるとともに、受信バッファ6aがコネクタ21を介して絶縁被覆線心9a1の他端に接続され、また他の線心である絶縁被覆線心9a2が未接続とされる。なお、コネクタ20、21には、絶縁被覆線心9a1、絶縁被覆線心9a2、編組遮蔽線9b用のそれぞれのピンが備えられるが、絶縁被覆線心9a2のピンを未接続とすることで、所望の接続構成を得る。
【0023】
このように構成した実施形態では、擬似的な同軸ケーブルが形成されインバータノイズ、すなわちコモンモードノイズは編組遮蔽線9bで遮蔽されて絶縁被覆線心9a1へ誘導されることがなく良好なSN比が得られる。したがって優れた屈曲性をもつ撚り合せ構造の伝送線を映像信号伝送線として用いても耐ノイズ性を確保することができ、画像品質の高い乗かご内防犯カメラ装置とすることができる。
【0024】
なお、映像記録機6に映像出力端子を備えるとともに、乗かご1内に映像入力端子を有する図示しない他の表示手段を設け、図8に示す多心平型移動ケーブル7に併設されるツイストペア腺19の一端を映像出力端子、その他端を映像入力端子に接続し、映像記録機6から映像信号を他の表示手段に伝送するようにしてもよい。この場合、一旦、乗かご1側からツイストペア腺9を介して映像記録機6に伝送された映像信号は、この映像記録機6から他のツイストペア腺19を介して乗かご1内に備えられる他の表示手段に伝送される。このとき他のツイストペア腺19は前述したツイストペア腺9と同様、その編組遮蔽線が映像出力端子側のグラウンドおよび映像入力端子側のグラウンドのそれぞれに接続されるとともに、絶縁被覆線心が映像出力端子および映像入力端子のそれぞれに接続され、かつ絶縁被覆線心と撚り合わされる他の線心は未接続とされる。これにより擬似的な同軸ケーブルが形成されインバータノイズ、すなわちコモンモードノイズは編組遮蔽線で遮蔽されて絶縁被覆線心へ誘導されることがなく良好なSN比が得られる。
【0025】
図2は本発明のエレベータの乗かご内防犯カメラ装置の他の実施形態を示す構成図、図3は乗かご内防犯カメラ装置の主要構成を示す構成図、図4は乗かご内防犯カメラ装置に用いられる多心平型ケーブルの断面図、図5は多心平型ケーブルに備えられる映像信号伝送線の拡大断面図、図6は映像信号伝送線の構成を示す断面図である。
【0026】
他の実施形態の乗かご内防犯カメラ装置は図3に示すように、乗かご30に設置されるカメラ31と、乗かご30上部に設置され映像出力端子を有する映像記録機32と、その上部に制御盤33が設けられる機械室34を備えた昇降路35外に配設され映像入力端子を有する表示手段、例えば映像モニタ36とを備え、映像記録機32から映像信号を複数の伝送線が併設された多心平型移動ケーブル37を介して映像モニタ36に伝送する。
【0027】
前記の多心平型移動ケーブル37には図4に示すように、給電線や他の一般信号線が割付けられる集合心38と、映像信号を伝送する映像信号伝送線39とが併設されている。
【0028】
また、前記の映像信号伝送線39は、図5に示すように導体39a1およびこの導体39a1を覆う絶縁体39a2を備えた絶縁被覆線心39aを有しているとともに、図4、6に示すように、絶縁被覆線心39aと撚り合わされる他の線心、すなわち撚り合わせ補助線心39bと、これら撚り合わされた絶縁被覆線心39aおよび撚り合わせ補助線心39bを覆う編組遮蔽線39cと、この編組遮蔽線39cの外周を覆う保護用の被覆39dとから成っている。なお、前記の撚り合わせ補助線心39bは絶縁被覆線心39aとの撚り合わせ状態を保持するために必要な硬度を持った、例えば絶縁体から成っている。また、絶縁被覆線心39aと撚り合わせ補助線心39b間の特性インピーダンスは75Ωが望ましく、これは絶縁被覆線心39aの絶縁体39a2の厚さ寸法、撚り合わせ補助線心39bの太さ寸法、絶縁被覆線心39aと撚り合わせ補助線心39bの撚り合わせ間隔で調整することができる。
【0029】
そして、他の実施形態の乗かご内防犯カメラ装置は図2に示すように、
映像出力端子、すなわち送信バッファ32a側のグラウンド32bがコネクタ40を介して編組遮蔽線39cの一端に接続されるとともに、映像入力端子、すなわち受信バッファ36a側のグラウンド36bがコネクタ41を介して編組遮蔽線39cの他端に接続され、かつ送信バッファ32aがコネクタ40を介して絶縁被覆線心39aの一端に接続されるとともに、受信バッファ36aがコネクタ41を介して絶縁被覆線心39aの他端に接続され、また他の線心である絶縁被覆線心39bが未接続とされる。なお、コネクタ40、41には、絶縁被覆線心39a、撚り合わせ補助線心39b、編組遮蔽線39c用のそれぞれのピンが備えられるが、撚り合わせ補助線心39bのピンを未接続とすることで、所望の接続構成を得る。
【0030】
このように構成した他の実施形態では、前述した実施形態と同様に、擬似的な同軸ケーブルが形成されインバータノイズ、すなわちコモンモードノイズは編組遮蔽線39cで遮蔽されて絶縁被覆線心39aへ誘導されることがなく良好なSN比が得られる。したがって優れた屈曲性をもつ撚り合せ構造の伝送線を映像信号伝送線として用いても耐ノイズ性を確保することができ、画像品質の高い乗かご内防犯カメラ装置とすることができる。
【0031】
【発明の効果】
本発明の請求項1ないし請求項3に係る発明によれば、映像信号伝送線の編組遮蔽線を映像出力端子側および映像入力端子側のグラウンドに接続するとともに、絶縁被覆線心を映像出力端子および映像入力端子に接続し、かつ絶縁被覆線心と撚り合わされる他の線心を未接続とすることより擬似的な同軸ケーブルが形成されインバータノイズ、すなわちコモンモードノイズが編組遮蔽線で遮蔽されて絶縁被覆線心へ誘導されることがなく良好なSN比が得られる。したがって優れた屈曲性をもつ撚り合せ構造の伝送線を映像信号伝送線として用いても耐ノイズ性を確保し、映像品質の高い乗かご内防犯カメラ装置を実現することができる。
【図面の簡単な説明】
【図1】本発明のエレベータの乗かご内防犯カメラ装置の一実施形態を示す構成図である。
【図2】本発明のエレベータの乗かご内防犯カメラ装置の他の実施形態を示す構成図である。
【図3】乗かご内防犯カメラ装置の主要構成を示す構成図である。
【図4】乗かご内防犯カメラ装置に用いられる多心平型ケーブルの断面図である。
【図5】多心平型ケーブルに備えられる映像信号伝送線の拡大断面図である。
【図6】映像信号伝送線の構成を示す断面図である。
【図7】エレベータの乗かご内防犯カメラ装置の主要構成を示す構成図である。
【図8】乗かご内防犯カメラ装置に用いられる多心平型ケーブルの断面図である。
【図9】多心平型ケーブルに備えられるツイストペア線の拡大断面図である。
【図10】ツイストペア線の構成を示す断面図である。
【図11】従来のツイストペア線の接続を示す構成図である。
【符号の説明】
1、30 乗かご
2、31 カメラ
2a、32a 送信バッファ(映像出力端子)
2b、32b グラウンド
6、32 映像記録機
6a、36a 受信バッファ(映像入力端子)
6b、36b グラウンド
7、37 多心平型ケーブル
9、19 ツイストペア腺
9a1、39a 絶縁被覆線心
9a2 絶縁被覆線心(他の線心)
9b、39c 編組遮蔽線
9c、39d 被覆
10、11、40、41 コネクタ
36 映像モニタ(表示手段)
39 映像信号伝送線
39b 撚り合わせ補助線心(他の線心)
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a security camera device in a car of an elevator, and more particularly to a security camera device in a car of an elevator in which a video signal is transmitted via a multi-core flat moving cable.
[0002]
[Prior art]
In recent years, the number of criminal offenses perceived has continued to increase. We have established the guidelines for the development of safe towns and promoted the construction of local communities where people can live safely and with peace of mind. In this movement, the installation of security cameras in the car has been specified as a matter to be particularly worked out for elevators in buildings and condominiums. For this reason, it is expected that security cameras will be installed in many elevators. When a security camera is installed, it is necessary to provide some kind of video signal transmission path in order to send a video signal of the security camera to a video recorder or display the video signal on a display unit.
[0003]
For this purpose, conventionally, a multi-core flat cable having a plurality of transmission lines such as twisted pair lines is used as a moving cable of an elevator, and the twisted pair lines are used as a signal transmission line for transmitting a video signal. The moving cable used in the elevator is required to have excellent bending characteristics because it repeatedly receives various mechanical actions such as bending and twisting with the movement of the car, but this point is disclosed. Some twisted pair wires have a twisted structure and therefore have excellent flexibility and are suitable as moving cables (see Patent Document 1).
[0004]
Here, a conventional example in which a twisted pair wire of a multi-core flat cable is used as a signal transmission line of a video signal will be described with reference to the drawings.
[0005]
7 is a configuration diagram showing a main configuration of a security camera device in a car of an elevator, FIG. 8 is a cross-sectional view of a multi-core flat cable used in the security camera device in a car, and FIG. 9 is a twisted pair provided in the multi-core flat cable. 10 is an enlarged cross-sectional view of the line, FIG. 10 is a cross-sectional view showing the configuration of the twisted pair line, and FIG. 11 is a configuration diagram showing the connection of the conventional twisted pair line.
[0006]
As shown in FIG. 7, the security camera device in the car is provided in the car 1 and having a video output terminal, and a video input terminal disposed in the machine room 5 above the hoistway 4 where the control panel 3 is provided. And a video signal transmitted from the camera 2 to the video recorder 6 via a multi-core flat type moving cable 7 provided with a plurality of transmission lines.
[0007]
As shown in FIG. 8, the multi-core flat type mobile cable 7 is provided with a collective core 8 to which a power supply line and other general signal lines are allocated, and a twisted pair line 9 for transmitting a video signal.
[0008]
Further, as shown in FIG. 9, the twisted pair wire 9 has an insulated wire core 9a1 having a conductor 90 and an insulator 91 covering the conductor 90. As shown in FIGS. 8 and 10, the insulated wire core 9a1 and the other insulated wire core 9a2 configured as described above are twisted, and the twisted insulated wire cores 9a1 and 9a2 are twisted. And a protective covering 9c for covering the outer periphery of the braided shielding wire 9b.
[0009]
As shown in FIG. 11, the twisted pair wire 9 is connected to the video output terminal of the camera 2, that is, the transmission buffer 2 a is connected to one end of the insulated wire core 9 a 1 via the connector 10. A video input terminal, that is, a reception buffer 6a is connected via a connector 11 to the other end of the insulated wire core 9a1. The ground 2b on the video output terminal side is connected to one end of the insulated wire core 9a2 via the connector 10, and the ground 6b on the video input terminal side is connected to the other end of the insulated wire core 9a2 via the connector 11. Connected.
[0010]
[Patent Document 1]
JP-A-11-185540 (paragraph number 0013, FIG. 3)
[0011]
[Problems to be solved by the invention]
By the way, in the moving cable of the elevator, the inverter noise, that is, the common mode noise is induced in all the transmission lines, and the same level of the common mode noise is also induced in the respective insulated cores 9a1 and 9a2 constituting the twisted pair line 9. . However, when an unbalanced signal such as a video signal is transmitted through the insulated core 9a1 while the insulated core 9a2 is connected to the grounds 2b and 6b as in the related art, the insulated wire is relatively insulated. A normal noise voltage appears at the center 9a1 and deteriorates the communication quality of the video signal, that is, the SN ratio. In particular, the speed of power devices for inverters is increasing year by year, and in elevators using inverters in recent years, a phenomenon in which high-level noise is induced on the transmission line of a moving cable due to a sharp voltage change by the inverter is observed. It has been confirmed by experiments that the communication quality is significantly deteriorated. Therefore, the present invention, which is considered to become more prominent in the future, has been made in view of such a situation in the prior art, and the object of the present invention is to provide a multi-core flat moving cable having excellent flexibility. An object of the present invention is to provide a security camera device in a car of an elevator that can ensure noise characteristics.
[0012]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 of the present invention is directed to a camera which is installed in a car and has a video output terminal, and which is disposed inside or outside a hoistway and records a video signal of the camera. And a video recorder having a video input terminal, wherein the camera transmits the video signal to the video recorder via a video signal transmission line of a multi-core flat type moving cable provided with a plurality of transmission lines. The video signal transmission line has an insulated wire core having a conductor and an insulator covering the conductor, another wire core that is twisted with the insulated wire core, and the insulated wire core that is twisted. In an elevator car security camera device having a braided shielding line covering the other wire core, a ground on the video output terminal side is connected to one end of the braided shielding line, The ground on the image input terminal side is connected to the other end of the braided shielding wire, and the video output terminal is connected to one end of the insulated wire core, and the video input terminal is the other end of the insulated wire core. And the other core is not connected.
[0013]
According to the invention according to claim 1 of the present invention, an elevator in which a camera having a video output terminal is installed in a car and a video recorder having a video input terminal in a hoistway or outside a hoistway is arranged. In this case, the video signal transmission line of the multi-core flat type moving cable for transmitting a video signal from a camera to a video recorder has an insulating coated core, another core, and a braided shielding line. The ground on the video output terminal side and the ground on the video input terminal side are connected to the braided shielding wire, the video output terminal and the video input terminal are connected to the insulated wire core, and the other cores are unconnected. Is done. As a result, a pseudo coaxial cable is formed, and the inverter noise, that is, the common mode noise is shielded by the braided shielded wire, and a good SN ratio is obtained without being guided to the insulated wire core. Therefore, even if a transmission line having a twisted structure having excellent flexibility is used as a video signal transmission line, noise resistance can be ensured.
[0014]
According to a second aspect of the present invention, there is provided a camera installed in a car, a video recorder for recording a video signal of the camera and having a video output terminal, and a video recorder installed in a hoistway or outside a hoistway. And display means having a video input terminal, wherein the video signal is transmitted from the video recorder to the display means via a video signal transmission line of a multi-core flat type moving cable provided with a plurality of transmission lines. Wherein said video signal transmission line comprises a conductor and an insulating coated core having an insulator covering said conductor, another core twisted with said insulating coated core, and said insulating coated core twisted together And in the car security camera device of the elevator having a braided shielding line that covers the other wire core, the ground on the video output terminal side is connected to one end of the braided shielding line, The ground on the video input terminal side is connected to the other end of the braided shielding wire, the video output terminal is connected to one end of the insulated wire core, and the video input terminal is connected to the other end of the insulated wire core. It is configured to be connected to the end and the other wire core is not connected.
[0015]
According to the invention according to claim 2 of the present invention, a video recorder having a camera and a video output terminal is installed in a car, and a display means having a video input terminal inside or outside a hoistway is provided. The video signal transmission line of the multi-core flat type moving cable for transmitting the video signal from the video recorder to the display means has an insulated wire core, another wire core, and a braided shielding wire. . The ground on the video output terminal side and the ground on the video input terminal side are connected to the braided shielding wire, the video output terminal and the video input terminal are connected to the insulated wire core, and the other cores are unconnected. Is done. As a result, a pseudo coaxial cable is formed, and the inverter noise, that is, the common mode noise is shielded by the braided shielded wire, and a good SN ratio is obtained without being guided to the insulated wire core. Therefore, even if a transmission line having a twisted structure having excellent flexibility is used as a video signal transmission line, noise resistance can be ensured.
[0016]
Further, the invention according to claim 3 of the present invention is characterized in that the video recorder has a video output terminal and another display means having a video input terminal is provided in the car, and the multi-core flat type moving cable is provided. One end of another video signal transmission line to be connected is connected to the video output terminal, and the other end is connected to the video input terminal, and the video signal is transmitted from the video recorder to the other display means. .
[0017]
According to the invention according to claim 3 of the present invention, the video signal once transmitted from the car side to the video recorder via the video signal transmission line is transmitted from the video recorder via another video signal transmission line. And transmitted to other display means provided in the car. At this time, the other video signal transmission lines are connected to the ground on the video output terminal side and the ground on the video input terminal side to the braided shielding wire, and the video output terminal is And the video input terminal are connected, and the other cores are not connected. As a result, a pseudo coaxial cable is formed, and the inverter noise, that is, the common mode noise is shielded by the braided shielded wire, and a good SN ratio is obtained without being guided to the insulated wire core.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a security camera device in an elevator car according to the present invention will be described with reference to the drawings.
[0019]
FIG. 1 is a configuration diagram showing an embodiment of a security camera device in an elevator car according to the present invention. The security camera device in the car according to the present embodiment has the same configuration as that shown in FIG. 7 to FIG. 10 described above, and the description will be given with reference to these drawings.
[0020]
As shown in FIG. 7, the security camera device in the car of the present embodiment is provided in a camera 2 installed in the car 1 and having a video output terminal, and in a machine room 5 above the hoistway 4 where the control panel 3 is provided. And a video recorder 6 having a video input terminal. The video signal is transmitted from the camera 2 to the video recorder 6 via a multi-core flat type moving cable 7 provided with a plurality of transmission lines.
[0021]
As shown in FIG. 8, the multi-core flat type mobile cable 7 is provided with a collective core 8 and a twisted pair wire 9 for transmitting a video signal, and the twisted pair wire 9 is a conductor as shown in FIGS. 90, an insulated wire core 9a1 having an insulator 91, another wire twisted with the insulated wire core 9a1, namely, an insulated wire core 9a2, a braided shielding wire 9b covering the insulated wire cores 9a1, 9a2, a braid. It consists of a coating 9c that covers the outer periphery of the shielding wire 9b. Preferably, the conductor 90 has a thickness of 0.75 square mm, which is the same as the conductor of the insulated wire constituting the collective core 8, and the insulator 91 is made of polyethylene in consideration of the stability of the dielectric constant at high frequencies. preferable. The characteristic impedance between the above-mentioned insulated wire cores 9a1 and 9a2 and the braided shield wire 9b is desirably 75Ω, which is adjusted by the thickness dimension of the insulator 91 of the insulated wire cores 9a1 and 9a2 and the twisting interval. Can be.
[0022]
As shown in FIG. 1, in the car security camera device of the present embodiment, the video output terminal, that is, the ground 2 b on the transmission buffer 2 a side is connected to one end of the braided shielding wire 9 b via the connector 20. The video input terminal, that is, the ground 6b on the receiving buffer 6a side is connected to the other end of the braided shielded wire 9b via the connector 21, and the transmitting buffer 2a is connected to one end of the insulated wire core 9a1 via the connector 20. At the same time, the reception buffer 6a is connected to the other end of the insulated wire core 9a1 via the connector 21, and the other insulated wire core 9a2 is not connected. The connectors 20 and 21 are provided with respective pins for an insulated wire core 9a1, an insulated wire core 9a2, and a braided shielding wire 9b. Obtain the desired connection configuration.
[0023]
In the embodiment configured as described above, a pseudo coaxial cable is formed, and the inverter noise, that is, the common mode noise is shielded by the braided shielded wire 9b and is not guided to the insulated wire core 9a1, and a good SN ratio is obtained. can get. Therefore, even if a transmission line having a twisted structure having excellent flexibility is used as a video signal transmission line, noise resistance can be ensured, and an in-car security camera device with high image quality can be obtained.
[0024]
The video recorder 6 is provided with a video output terminal, and other display means (not shown) having a video input terminal in the car 1 is provided, so that the twisted pair glands 19 attached to the multi-core flat type moving cable 7 shown in FIG. May be connected to a video output terminal and the other end to a video input terminal to transmit a video signal from the video recorder 6 to another display means. In this case, the video signal once transmitted from the car 1 to the video recorder 6 via the twisted pair gland 9 is provided in the car 1 from the video recorder 6 via another twisted pair gland 19. Is transmitted to the display means. At this time, the other twisted pair glands 19 are connected to the ground on the video output terminal side and the ground on the video input terminal side in the same manner as the above-mentioned twisted pair gland 9, and the insulating coated wire core is connected to the video output terminal. The other core connected to each of the video input terminals and twisted with the insulated core is left unconnected. As a result, a pseudo coaxial cable is formed, and the inverter noise, that is, the common mode noise is shielded by the braided shielded wire, and a good SN ratio is obtained without being guided to the insulated wire core.
[0025]
2 is a configuration diagram showing another embodiment of the security camera device in the car of the elevator of the present invention, FIG. 3 is a configuration diagram showing a main configuration of the security camera device in the car, and FIG. 4 is a security camera device in the car. FIG. 5 is an enlarged cross-sectional view of a video signal transmission line provided in the multi-core flat cable, and FIG. 6 is a cross-sectional view showing a configuration of the video signal transmission line.
[0026]
As shown in FIG. 3, a security camera device in a car according to another embodiment has a camera 31 installed on the car 30, a video recorder 32 installed on the car 30 and having a video output terminal, and an upper part thereof. A display means, for example, a video monitor 36, which is disposed outside a hoistway 35 having a machine room 34 in which a control panel 33 is provided, and has a video input terminal. The data is transmitted to the video monitor 36 via the multi-core flat type moving cable 37 attached.
[0027]
As shown in FIG. 4, the multi-core flat type moving cable 37 is provided with a collective core 38 to which a power supply line and other general signal lines are allocated, and a video signal transmission line 39 for transmitting a video signal.
[0028]
The video signal transmission line 39 has a conductor 39a1 as shown in FIG. 5 and an insulating core 39a provided with an insulator 39a2 covering the conductor 39a1, and as shown in FIGS. In addition, another wire core that is twisted with the insulated wire core 39a, that is, a twisted auxiliary wire core 39b, a braided shield wire 39c that covers the twisted insulated wire core 39a and the twisted auxiliary wire core 39b, And a protective coating 39d for covering the outer periphery of the braided shielding wire 39c. The twisting auxiliary wire core 39b is made of, for example, an insulator having a hardness necessary for maintaining a twisted state with the insulating coated wire core 39a. The characteristic impedance between the insulated wire core 39a and the twisted auxiliary wire core 39b is desirably 75Ω, which is the thickness of the insulator 39a2 of the insulated wire core 39a, the thickness of the twisted auxiliary wire core 39b, It can be adjusted by the twisting interval between the insulated wire core 39a and the twisting auxiliary wire core 39b.
[0029]
Then, the security camera device in the car of another embodiment is, as shown in FIG.
The video output terminal, that is, the ground 32b on the transmission buffer 32a side is connected to one end of the braid shielding wire 39c via the connector 40, and the video input terminal, that is, the ground 36b on the reception buffer 36a side is connected via the connector 41 to the braid shielding. The transmission buffer 32a is connected to one end of the insulated core 39a via the connector 40, and the reception buffer 36a is connected to the other end of the insulated core 39a via the connector 41. The wire core 39b which is connected and is the other wire core is not connected. The connectors 40 and 41 are provided with respective pins for an insulation-coated core 39a, a twisting auxiliary core 39b, and a braid shield wire 39c, but the pins of the twisting auxiliary core 39b are not connected. Thus, a desired connection configuration is obtained.
[0030]
In another embodiment configured as described above, a pseudo coaxial cable is formed and inverter noise, that is, common mode noise is shielded by the braided shield wire 39c and guided to the insulated wire core 39a, similarly to the above-described embodiment. A good SN ratio can be obtained without being performed. Therefore, even if a transmission line having a twisted structure having excellent flexibility is used as a video signal transmission line, noise resistance can be ensured, and an in-car security camera device with high image quality can be obtained.
[0031]
【The invention's effect】
According to the first to third aspects of the present invention, the braided shielding wire of the video signal transmission line is connected to the ground on the video output terminal side and the video input terminal side, and the insulated wire core is connected to the video output terminal. And a pseudo coaxial cable is formed by connecting to the video input terminal and leaving other wires twisted with the insulated wire core unconnected, and inverter noise, that is, common mode noise is shielded by the braided shielding wire. Thus, a good SN ratio can be obtained without being guided to the insulated wire core. Therefore, even if a transmission line having a twisted structure having excellent flexibility is used as a video signal transmission line, noise resistance is secured, and a security camera device in a car with high video quality can be realized.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a security camera device in a car of an elevator according to the present invention.
FIG. 2 is a configuration diagram showing another embodiment of the security camera device in the elevator car of the present invention.
FIG. 3 is a configuration diagram showing a main configuration of a security camera device in the car.
FIG. 4 is a cross-sectional view of a multi-core flat cable used in a security camera device in a car.
FIG. 5 is an enlarged sectional view of a video signal transmission line provided in the multi-core flat cable.
FIG. 6 is a cross-sectional view illustrating a configuration of a video signal transmission line.
FIG. 7 is a configuration diagram showing a main configuration of a security camera device in a car of an elevator.
FIG. 8 is a sectional view of a multi-core flat cable used in a security camera device in a car.
FIG. 9 is an enlarged sectional view of a twisted pair wire provided in the multicore flat cable.
FIG. 10 is a sectional view showing a configuration of a twisted pair wire.
FIG. 11 is a configuration diagram showing connection of a conventional twisted pair line.
[Explanation of symbols]
1,30 car 2,31 camera 2a, 32a transmission buffer (video output terminal)
2b, 32b Ground 6, 32 Video recorder 6a, 36a Receive buffer (video input terminal)
6b, 36b Ground 7, 37 Multi-core flat cable 9, 19 Twisted pair gland 9a1, 39a Insulated wire core 9a2 Insulated wire core (other wires)
9b, 39c Braided shielding wire 9c, 39d Coating 10, 11, 40, 41 Connector 36 Video monitor (display means)
39 Video signal transmission line 39b Twisted auxiliary core (other core)

Claims (3)

乗かごに設置され映像出力端子を有するカメラと、昇降路内あるいは昇降路外に配設され前記カメラの映像信号を記録するとともに映像入力端子を有する映像記録機とを備え、前記カメラから前記映像信号を複数の伝送線が併設された多心平型移動ケーブルの映像信号伝送線を介して前記映像記録機に伝送するものであって、前記映像信号伝送線が、導体およびこの導体を覆う絶縁体を有する絶縁被覆線心と、この絶縁被覆線心と撚り合わされる他の線心と、撚り合わされた前記絶縁被覆線心および前記他の線心を覆う編組遮蔽線とを有して成るエレベータの乗かご内防犯カメラ装置において、
前記映像出力端子側のグラウンドが前記編組遮蔽線の一端に接続されるとともに、前記映像入力端子側のグラウンドが前記編組遮蔽線の他端に接続され、かつ前記映像出力端子が前記絶縁被覆線心の一端に接続されるとともに、前記映像入力端子が前記絶縁被覆線心の他端に接続され、また前記他の線心が未接続とされることを特徴とするエレベータの乗かご内防犯カメラ装置。
A camera installed in the car and having a video output terminal, and a video recorder arranged in the hoistway or outside the hoistway and recording a video signal of the camera and having a video input terminal, and the video from the camera A signal is transmitted to the video recorder via a video signal transmission line of a multi-core flat type mobile cable provided with a plurality of transmission lines, wherein the video signal transmission line includes a conductor and an insulator covering the conductor. An elevator comprising: an insulated wire core having: a wire core twisted with the insulated wire core; and a braided shielded wire covering the insulated wire core and the other wire core. In the security camera device in the car,
The ground on the video output terminal side is connected to one end of the braided shielding wire, the ground on the video input terminal side is connected to the other end of the braided shielding wire, and the video output terminal is connected to the insulated wire core. Characterized in that the video input terminal is connected to the other end of the insulated wire core, and the other wire core is not connected. .
乗かごに設置されるカメラおよびこのカメラの映像信号を記録するとともに映像出力端子を有する映像記録機と、昇降路内あるいは昇降路外に配設され映像入力端子を有する表示手段とを備え、前記映像記録機から前記映像信号を複数の伝送線が併設された多心平型移動ケーブルの映像信号伝送線を介して前記表示手段に伝送するものであって、前記映像信号伝送線が、導体およびこの導体を覆う絶縁体を有する絶縁被覆線心と、この絶縁被覆線心と撚り合わされる他の線心と、撚り合わされた前記絶縁被覆線心および前記他の線心を覆う編組遮蔽線とを有して成るエレベータの乗かご内防犯カメラ装置において、
前記映像出力端子側のグラウンドが前記編組遮蔽線の一端に接続されるとともに、前記映像入力端子側のグラウンドが前記編組遮蔽線の他端に接続され、かつ前記映像出力端子が前記絶縁被覆線心の一端に接続されるとともに、前記映像入力端子が前記絶縁被覆線心の他端に接続され、また前記他の線心が未接続とされることを特徴とするエレベータの乗かご内防犯カメラ装置。
A camera installed in the car and a video recorder that records a video signal of the camera and has a video output terminal, and a display unit that has a video input terminal disposed inside or outside the hoistway, The video signal is transmitted from the video recorder to the display means via a video signal transmission line of a multi-core flat type moving cable provided with a plurality of transmission lines, wherein the video signal transmission line includes a conductor and a conductor. An insulated wire core having an insulator covering the conductor, another wire core twisted with the insulated wire core, and a braided shielding wire covering the twisted insulated wire core and the other wire core. In the elevator security camera device in the elevator car
The ground on the video output terminal side is connected to one end of the braided shielding wire, the ground on the video input terminal side is connected to the other end of the braided shielding wire, and the video output terminal is connected to the insulated wire core. Characterized in that the video input terminal is connected to the other end of the insulated wire core, and the other wire core is not connected. .
前記映像記録機に映像出力端子を備えるとともに、前記乗かご内に映像入力端子を有する他の表示手段を設け、前記多心平型移動ケーブルに併設される他の映像信号伝送線の一端を前記映像出力端子、その他端を前記映像入力端子に接続し、前記映像記録機から前記映像信号を前記他の表示手段に伝送することを特徴とする請求項1記載のエレベータの乗かご内防犯カメラ装置。The video recorder has a video output terminal, and other display means having a video input terminal in the car is provided, and one end of another video signal transmission line attached to the multi-core flat type moving cable is connected to the video. 2. The security camera device in an elevator car according to claim 1, wherein an output terminal and the other end are connected to the video input terminal, and the video signal is transmitted from the video recorder to the other display means.
JP2002362794A 2002-12-13 2002-12-13 Security camera device in elevator car Expired - Lifetime JP4205418B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
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JP2006202641A (en) * 2005-01-21 2006-08-03 Sumitomo Electric Ind Ltd Coaxial cable and multi-core coaxial cable
JP2010275095A (en) * 2009-06-01 2010-12-09 Mitsubishi Electric Corp In-car security camera device for elevator
JP6054498B1 (en) * 2015-11-19 2016-12-27 東芝エレベータ株式会社 Elevator, and video processing apparatus and video processing method used therefor

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CN110697541B (en) * 2018-07-10 2021-03-23 广州广日电气设备有限公司 Elevator cable following system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006202641A (en) * 2005-01-21 2006-08-03 Sumitomo Electric Ind Ltd Coaxial cable and multi-core coaxial cable
JP4591094B2 (en) * 2005-01-21 2010-12-01 住友電気工業株式会社 Coaxial cable and multi-core coaxial cable
JP2010275095A (en) * 2009-06-01 2010-12-09 Mitsubishi Electric Corp In-car security camera device for elevator
JP6054498B1 (en) * 2015-11-19 2016-12-27 東芝エレベータ株式会社 Elevator, and video processing apparatus and video processing method used therefor

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