JP2006180293A - Head separation type single panel type color camera device - Google Patents

Head separation type single panel type color camera device Download PDF

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JP2006180293A
JP2006180293A JP2004372262A JP2004372262A JP2006180293A JP 2006180293 A JP2006180293 A JP 2006180293A JP 2004372262 A JP2004372262 A JP 2004372262A JP 2004372262 A JP2004372262 A JP 2004372262A JP 2006180293 A JP2006180293 A JP 2006180293A
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camera
head
signal
unit
synchronization signal
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Satoshi Watanabe
悟史 渡邊
Makoto Watanabe
誠 渡邊
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SENSOR TECHNOLOGY CO Ltd
Sensor Technology Co Ltd Japan
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SENSOR TECHNOLOGY CO Ltd
Sensor Technology Co Ltd Japan
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a head separation type single panel type color camera device whose camera head and camera control portion are separated, in which the camera head is small-sized and connected to the camera control portion through one coaxial cable and which can control an electronic shutter etc., and can externally be synchronized with the other device. <P>SOLUTION: The head separation type single panel type color camera device comprises the camera head which outputs a video signal read out of a solid-state imaging device with a clock synchronized with a synchronizing signal sent from the camera control portion and generated by a timing signal generating means and based upon the array order of pixels and the camera control portion which outputs a color video signal by sampling the video signal inputted from the camera head and with a clock in phase with the video signal and is equipped with a synchronizing signal generating means of generating the clock in phase and the synchronizing signal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本願発明は、カメラヘッド部とカメラ制御部が分離した単板式カラーカメラ装置に関する。   The present invention relates to a single-plate color camera device in which a camera head unit and a camera control unit are separated.

図２に記載の従来例のカメラヘッド部とカメラ制御部が分離した単板式カラーカメラ装置のブロック図で示すように、単一の２次元固体撮像デバイス単板カラーＣＣＤ１０４の各画素上に複数種の色フィルタが所定の順序で配列された単板カラーＣＣＤ１０４を使用した単板式カラーカメラ装置１０１において、カメラヘッド部１０２の大きさを人の親指大又はそれ以下に超小型化するためカメラヘッド部１０２には単板カラーＣＣＤ１０４のみ内蔵し、単板カラーＣＣＤ１０４の駆動用Ｖドライバ回路１０７，Ｈドライバ回路１０８、ＣＤＳ回路１０５（相関二重サンプリング回路）、カラー信号処理手段１０６、タイミング信号発生手段１０９等はカメラ制御部１０３側に配設している例が多い。   As shown in the block diagram of the single-plate color camera apparatus in which the camera head unit and the camera control unit of the conventional example shown in FIG. 2 are separated, a plurality of types are provided on each pixel of a single two-dimensional solid-state imaging device single-chip color CCD 104. In the single-plate color camera device 101 using the single-plate color CCD 104 in which the color filters are arranged in a predetermined order, the camera head portion is made to be ultra-small so that the size of the camera head portion 102 is equal to or smaller than a human thumb. Only a single-plate color CCD 104 is built in 102, a V driver circuit 107 for driving the single-plate color CCD 104, an H driver circuit 108, a CDS circuit 105 (correlated double sampling circuit), a color signal processing means 106, and a timing signal generation means 109. Are often arranged on the camera control unit 103 side.

このため、例えば、１／４”２７万画素ＮＴＳＣ方式単板カラー用ＩＴ−ＣＣＤをカメラヘッド部１０２に使用した単板式カラーカメラ装置１０１において、そのカメラ制御部１０３では、ＣＣＤ駆動のためＶ，Ｈドライバ、タイミング信号発生手段１０９、ＣＬＫ発生回路１１０等で構成され、垂直４９２、水平５１２画素数を駆動するためには水平方向の駆動周波数が９．５３５ＭＨｚになるから、ＣＣＤ駆動用タイミング信号発生手段１０９ではこの周波数の２倍、１９．０７ＭＨｚが基本クロック周波数となる。   For this reason, for example, in a single-plate color camera device 101 using a 1/4 "270,000-pixel NTSC single-plate color IT-CCD for the camera head unit 102, the camera control unit 103 uses V, It is composed of H driver, timing signal generating means 109, CLK generating circuit 110 and the like, and in order to drive the number of vertical 492 and horizontal 512 pixels, the driving frequency in the horizontal direction becomes 9.535 MHz. In means 109, the basic clock frequency is 19.07 MHz which is twice this frequency.

そこで、タイミング信号発生手段１０９では前記基本クロック周波数から同期信号をはじめ、各種のパルスが作られ、単板カラーＣＣＤ１０４の駆動に必要な垂直転送のための４相パルスＶ１〜Ｖ４、フィールドシフトパルス、水平転送のための２相パルスＨ１，Ｈ２などが作られるが、これらのパルス波形条件として数ｎｓから３００ｎｓ以内の立ち上がり、立ち下がり時間が要求される高速パルスをカメラヘッド部１０２へ送出する必要がある。
特許第３４６９４２６号公報 特開２０００−１３４６３３号公報 Therefore, in the timing signal generation means 109, various pulses including a synchronization signal are generated from the basic clock frequency, and four-phase pulses V1 to V4 for vertical transfer necessary for driving the single-plate color CCD 104, field shift pulses, Two-phase pulses H1, H2, and the like for horizontal transfer are generated. As these pulse waveform conditions, it is necessary to send to the camera head unit 102 high-speed pulses that require rise and fall times within a few ns to 300 ns. is there.
Japanese Patent No. 3469426 JP 2000-134633 A

この種のＮＴＳＣ方式、ＶＧＡ方式のカメラでは、映像信号の信号線のほか、同期信号用ケーブル、クロック用ケーブルがそれぞれ必要となり、ケーブル芯線数が増加するため、ケーブルが高価になり、また屈曲性が悪く、ケーブルを細心化すると断線事故が心配されるだけでなく、ケーブルが数十メートルに亘って延長される場合は、映像信号が途中で減衰したり、特にＣＣＤ駆動用タイミング信号の高速パルスの遅延と劣化によりカメラヘッド部から伝送された映像信号とカメラ制御部側でのサンプリングのタイミングの位相のずれが生じ、精度の良い画像データが得られなくなるおそれがあり、その位相合わせのため回路が複雑となり設置工事の際の作業性が悪かった。   These types of NTSC and VGA cameras require a video signal line, a synchronization signal cable, and a clock cable, which increases the number of cable cores, making the cable expensive and flexible. If the cable is lengthened, it is not only worrying about disconnection accidents, but if the cable is extended over several tens of meters, the video signal may be attenuated along the way, and especially the high-speed pulse of the CCD drive timing signal Due to the delay and deterioration of the image, the video signal transmitted from the camera head unit and the sampling timing on the camera control unit side may be out of phase, and accurate image data may not be obtained. Became complicated and the workability during installation work was poor.

さらに、映像信号の劣化の補正及びサンプリングのタイミングの位相合わせをカメラ装置毎に行う必要があるため、カメラヘッド部同士又はカメラ制御部同士及び相互間の互換性が失われ、多数のカメラ装置を設置する場合は設置工事に多大な時間と労力を要し、その後のメンテナンスにも支障を生じていた。   Furthermore, since it is necessary to correct the deterioration of the video signal and to adjust the sampling timing phase for each camera device, the compatibility between the camera head units or between the camera control units and each other is lost. In the case of installation, the installation work required a lot of time and labor, and the subsequent maintenance was also hindered.

さらにまた、ＨＤＴＶ方式など高精細画像対応の固体撮像デバイスを使用したヘッド分離型単板式カラーカメラ装置においてはＣＣＤ駆動用タイミング信号はさらに高速パルスとなるため実現性は極めて難しかった。   Furthermore, in a head-separated single-plate color camera device that uses a solid-state imaging device that supports high-definition images such as the HDTV system, the timing signal for driving the CCD becomes a further high-speed pulse, which makes it extremely difficult to implement.

上記の問題を一部解決したカメラヘッド部とカメラ制御部が分離した単板式カラーカメラ装置もあるが、外部同期方式としたり、電子シャッタ制御及びランダムトリガ方式で外部トリガ信号で駆動できるヘッド分離型単板式カラーカメラ装置は開発されていなかった。   Although there is a single-plate color camera device in which the camera head part and camera control part are partly solved, the head synchronization type that can be driven by an external trigger signal by the external synchronization method or the electronic shutter control and random trigger method No single-plate color camera device has been developed.

本願発明者は、上記に鑑み鋭意研究の結果、次の手段によりこの課題を解決した。
（１）カメラヘッド部とカメラ制御部が分離した単板式カラーカメラ装置において、前記カメラ制御部から送出された同期信号に同期したタイミング信号発生手段で生成されたクロックで固体撮像デバイスから読み出され画素の配列順序に基づいた映像信号を出力するカメラヘッド部と、前記カメラヘッド部から入力された映像信号と同位相のクロックにより前記映像信号をサンプリングしてカラー映像信号を出力する前記同位相のクロック及び同期信号を生成する同期信号発生手段を備えたカメラ制御部とで構成してなることを特徴とするヘッド分離型単板式カラーカメラ装置。 The inventor of the present application has solved this problem by the following means as a result of intensive studies in view of the above.
(1) In a single-plate color camera device in which a camera head unit and a camera control unit are separated, the camera head unit and the camera control unit are read from the solid-state imaging device with a clock generated by timing signal generation means synchronized with a synchronization signal sent from the camera control unit. A camera head unit that outputs a video signal based on an arrangement order of pixels, and a video signal that is sampled by a clock having the same phase as the video signal input from the camera head unit and outputs a color video signal. A head-separated single-plate color camera device comprising a camera control unit having a clock and a synchronization signal generating means for generating a synchronization signal.

（２）前記カメラヘッド部から送出する映像信号と、カメラ制御部から送出する同期信号とが、一本の同軸ケーブルに重畳して送受されてなることを特徴とする前項（１）に記載のヘッド分離型単板式カラーカメラ装置。 (2) The video signal transmitted from the camera head unit and the synchronization signal transmitted from the camera control unit are transmitted and received superimposed on a single coaxial cable. Head-separated single-plate color camera device.

（３）前記カメラ制御部が、さらにカメラヘッド部との接続同軸ケーブルによる水平同期信号の遅延量を補正するケーブル補正手段を備え、
前記ケーブル補正手段が、カメラヘッド部から送り返された水平同期信号と、前記同期信号発生手段で生成された水平同期信号との位相差を検知し同相に制御してなることを特徴とする前項（１）又は（２）に記載のヘッド分離型単板式カラーカメラ装置。 (3) The camera control unit further includes cable correction means for correcting a delay amount of the horizontal synchronization signal by the coaxial cable connected to the camera head unit,
The cable correction unit detects a phase difference between a horizontal synchronization signal sent back from the camera head unit and a horizontal synchronization signal generated by the synchronization signal generation unit, and controls the phase difference to be in phase (previous item) The head-separated single-plate color camera device according to 1) or (2).

（４）前記カメラ制御部が、該カメラ制御部から送出する同期信号にカメラヘッド部を制御する制御信号を重畳して送出する手段を備えてなることを特徴とする前項（１）〜（３）のいずれか１項に記載のヘッド分離型単板式カラーカメラ装置。 (4) The above-mentioned (1) to (3), wherein the camera control unit includes means for superimposing and transmitting a control signal for controlling the camera head unit on a synchronization signal transmitted from the camera control unit. The head separation type single plate type color camera device according to any one of the above.

（５）前記カメラ制御部が、外部機器と同期できる外部同期手段を備えてなることを特徴とする前項（１）〜（４）のいずれか１項に記載のヘッド分離型単板式カラーカメラ装置。 (5) The head-separated single-plate color camera device according to any one of (1) to (4), wherein the camera control unit includes an external synchronization unit that can synchronize with an external device. .

（６）前記カメラ制御部が、該カメラ制御部から送出する同期信号に直流電源を重畳して送出する手段と、前記カメラヘッド部が、前記カメラ制御部から送出された同期信号と直流電源の分離手段とを備えてなることを特徴とする前項（１）〜（５）のいずれか１項に記載のヘッド分離型単板式カラーカメラ装置。 (6) The camera control unit superimposes and transmits a DC power source on the synchronization signal transmitted from the camera control unit, and the camera head unit transmits the synchronization signal transmitted from the camera control unit and the DC power source. A head-separated single-plate color camera device as set forth in any one of (1) to (5) above, characterized in that it comprises a separating means.

（７）前記カメラヘッド部が、標準方式に基づく映像信号を出力する手段を備えてなることを特徴とする前項（１）〜（６）のいずれか１項に記載のヘッド分離型単板式カラーカメラ装置。 (7) The head-separated single plate color according to any one of (1) to (6), wherein the camera head unit includes means for outputting a video signal based on a standard system. Camera device.

本願発明によれば、次のような効果が発揮される。
１．本願発明の請求項１の発明によれば、
前記カメラヘッド部内部のタイミング信号発生手段で、前記カメラ制御部から送出された同期信号に同期したクロックでＣＣＤ駆動用タイミング信号を生成しているので、ＣＣＤの駆動に必要な垂直転送のための４相パルスやフィールドシフトパルス、水平転送のための２相パルス等高速パルスのカメラヘッド部とカメラ制御部間の送受、位相合わせが不要のため、ケーブル本数の削減、長距離伝送が可能となる。 According to the present invention, the following effects are exhibited.
1. According to the invention of claim 1 of the present invention,
The timing signal generating means inside the camera head unit generates the CCD driving timing signal with a clock synchronized with the synchronizing signal sent from the camera control unit, so that it is necessary for vertical transfer required for driving the CCD. High-speed pulses such as 4-phase pulses, field shift pulses, and 2-phase pulses for horizontal transfer are not required to be sent and received between the camera control unit and the camera control unit, and phase alignment is not required, enabling reduction in the number of cables and long-distance transmission. .

また、カメラヘッド部同士とカメラ制御部同士及び相互間に互換性を有するため、多数のカメラ装置を設置する場合は設置工事では多大な時間と労力を要していた前記ＣＣＤ駆動用タイミング信号の高速パルスの位相合わせが全く不要となり、設置工事期間の短縮、工事コストの削減ができる。また、その後のメンテナンス時の作業性も向上する。   In addition, since there is compatibility between the camera head units and the camera control units and between each other, when installing a large number of camera devices, the timing signal for driving the CCD, which required a lot of time and labor in the installation work, is required. High-speed pulse phasing is completely unnecessary, shortening the installation period and reducing construction costs. In addition, workability during subsequent maintenance is also improved.

さらに、前記カメラ制御部内部に前記カメラヘッド部から入力された映像信号と同位相のクロック及び同期信号を生成する同期信号発生手段を備えて、前記同位相のクロックによりカメラヘッド部から送出された画素の配列順序に基づいた輝度信号の前記映像信号をサンプリングしてカラー映像信号を生成しているので、カメラヘッド部の小型化に資すると同時に、Ｒ、Ｇ、Ｂ又はＮＴＳＣ等規格化された方式への対応が容易である。   Furthermore, the camera control unit includes a synchronization signal generating means for generating a clock and a synchronization signal having the same phase as that of the video signal input from the camera head unit, and is transmitted from the camera head unit by the clock having the same phase. Since the video signal of the luminance signal based on the pixel arrangement order is sampled to generate a color video signal, it contributes to miniaturization of the camera head part and is standardized such as R, G, B or NTSC. Easy to adapt to the system.

さらにまた、ＨＤＴＶ方式など高精細画像対応の固体撮像デバイスを使用したヘッド分離型単板式カラーカメラ装置にも容易に対応できる。   Furthermore, it is possible to easily cope with a head-separated single-plate color camera device using a solid-state imaging device that supports high-definition images such as an HDTV system.

２．本願発明の請求項２の発明によれば、
前記請求項１の効果に加えて、前記カメラヘッド部から送出する映像信号と、カメラ制御部から送出する同期信号とが、一本の同軸ケーブルに重畳して送受されているので、布線等設置工事が容易で、同時にケーブルコストの節減が可能になり、かつ各種の同軸ケーブルを採用できるので、ケーブル延長に伴う映像信号の劣化等を補償増幅器又は補償増幅回路を増設することなくケーブルの延長が可能になる。 2. According to the invention of claim 2 of the present invention,
In addition to the effect of the first aspect, the video signal transmitted from the camera head unit and the synchronization signal transmitted from the camera control unit are transmitted and received while being superimposed on a single coaxial cable. Installation work is easy, cable costs can be reduced at the same time, and various types of coaxial cables can be used, so cable extension can be extended without adding a compensation amplifier or compensation amplifier circuit to prevent video signal degradation due to cable extension. Is possible.

３．本願発明の請求項３の発明によれば、
前記請求項１及び２の効果に加えて、前記カメラ制御部が、さらにカメラヘッド部との接続ケーブルによる水平同期信号の遅延量を補正するケーブル補正手段を備え、前記ケーブル補正手段が、カメラヘッド部から送り返された水平同期信号と、前記同期信号発生手段で生成された水平同期信号との位相差を検知し同相になるように制御しているので、前記接続ケーブルの長さを変更しても、常に水平同期信号の遅延量が補正されると同時に、カメラ制御部で生成されるクロックも前記カメラヘッド部から入力された映像信号と同位相のクロックに制御され前記映像信号を正確にサンプリングして規定のカラー映像信号を出力することができる。 3. According to the invention of claim 3 of the present invention,
In addition to the effects of the first and second aspects, the camera control unit further includes a cable correction unit that corrects a delay amount of a horizontal synchronization signal by a connection cable with the camera head unit, and the cable correction unit includes a camera head. Since the phase difference between the horizontal synchronizing signal sent back from the unit and the horizontal synchronizing signal generated by the synchronizing signal generating means is detected and controlled to be in phase, the length of the connecting cable is changed. In addition, the delay amount of the horizontal synchronization signal is always corrected, and at the same time, the clock generated by the camera control unit is also controlled to a clock having the same phase as the video signal input from the camera head unit, so that the video signal is accurately sampled. Thus, a prescribed color video signal can be output.

また、ケーブル延長に伴うＣＣＤ駆動用タイミング信号の高速パルスの遅延が無く、位相合わせが不要のため、カメラヘッド部同士とカメラ制御部同士及び相互間に互換性を有し、さらに、多数のカメラ装置を設置する場合は設置工事では多大な時間と労力を要していた前記ＣＣＤ駆動用タイミング信号の高速パルスの位相合わせが不要となり、設置工事期間の短縮、工事コストの削減ができる。また、その後のメンテナンス時の作業性も向上する。   In addition, there is no delay of the high-speed pulse of the CCD drive timing signal due to cable extension, and phase alignment is not required, so there is compatibility between the camera heads and between the camera control units, and between many cameras. In the case of installing the apparatus, the phase alignment of the high-speed pulse of the timing signal for driving the CCD, which required a lot of time and labor in the installation work, becomes unnecessary, and the installation work period can be shortened and the construction cost can be reduced. In addition, workability during subsequent maintenance is also improved.

４．本願発明の請求項４の発明によれば、
前記請求項１〜３の効果に加えて、前記カメラ制御部が、該カメラ制御部から送出する同期信号にカメラヘッド部を制御する制御信号を重畳して送出する手段を備えているので、固体撮像デバイスの電子シャッタ制御、ランダムトリガによる電子シャッタ制御及び画像読みだし制御等をカメラ制御部側から制御できるので、監視用途のみでなく従来機種と同様に、ＦＡ用、画像処理用カメラ装置として用途拡大ができる。 4). According to the invention of claim 4 of the present invention,
In addition to the effects of the first to third aspects, the camera control unit includes means for superimposing and transmitting a control signal for controlling the camera head unit on a synchronization signal transmitted from the camera control unit. The electronic shutter control of the imaging device, electronic shutter control by random trigger, image reading control, etc. can be controlled from the camera control unit side, so that it can be used not only for monitoring purposes but also for FA and image processing camera devices as with conventional models Can be enlarged.

５．本願発明の請求項５の発明によれば、
前記請求項１〜４の効果に加えて、前記カメラ制御部が、外部機器と同期できる外部同期手段を備えているので、外部からの同期信号をカメラ制御部へ入力することにより本願発明の複数のヘッド分離型単板式カラーカメラ装置を同期制御でき、画像切換、合成等を容易に、かつ精度良く制御することができる。 5. According to the invention of claim 5 of the present invention,
In addition to the effects of the first to fourth aspects, since the camera control unit includes an external synchronization unit that can synchronize with an external device, a plurality of the inventions of the present invention can be performed by inputting an external synchronization signal to the camera control unit. The head-separated single-plate color camera device can be synchronously controlled, and image switching, composition, etc. can be controlled easily and accurately.

６．本願発明の請求項６の発明によれば、
前記請求項１〜５の効果に加えて、前記カメラ制御部が、該カメラ制御部から送出する同期信号に直流電源を重畳して送出する手段と、前記カメラヘッド部が、前記カメラ制御部から送出された同期信号と直流電源の分離手段とを備えているので、電源専用の接続ケーブルが不要となり、布線等設置工事が容易で、同時にケーブルコストの節減が可能になる。 6). According to the invention of claim 6 of the present invention,
In addition to the effects of the first to fifth aspects, the camera control unit transmits a DC power source superimposed on a synchronization signal transmitted from the camera control unit, and the camera head unit receives from the camera control unit. Since the synchronization signal sent out and the means for separating the DC power supply are provided, a connection cable dedicated to the power supply becomes unnecessary, installation work such as wiring is easy, and cable cost can be reduced at the same time.

７．本願発明の請求項７の発明によれば、
前記請求項１〜６の効果に加えて、前記カメラヘッド部が、標準方式に基づく映像信号を出力する手段を備えているので、カメラヘッド部が遠隔地に設置されていても、カメラヘッド部に映像信号出力端子を装着しておけば、設置工事中や、メンテナンス時に映像モニタ等を接続して映像を確認でき作業性が向上する。 7). According to the invention of claim 7 of the present invention,
In addition to the effects of the first to sixth aspects, since the camera head unit includes means for outputting a video signal based on a standard system, even if the camera head unit is installed in a remote place, the camera head unit If the video signal output terminal is attached to the, the video can be confirmed by connecting a video monitor or the like during installation work or maintenance, and the workability is improved.

本願発明を実施するための最良の形態を実施例図に基づき説明する。図１は、本願発明実施例のヘッド分離型単板式カラーカメラ装置のブロック図、である。   The best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a head-separated single-plate color camera device according to an embodiment of the present invention.

図１において、カメラヘッド部２は、単板カラーＣＣＤ（固体撮像デバイス、以後、ＣＣＤと記述）４が補色モザイク方式あるいは原色モザイク方式等の方式で、各画素上に複数種の色フィルタが所定の順序で配列された単板カラーＣＣＤ４と、このＣＣＤ４で光電変換された映像信号のリセット雑音を除去するＣＤＳ（相関二重サンプリング）回路５と、カメラ制御部３へケーブル接続端子７を介して送出する映像信号とモニタ出力端子８に出力する映像信号を生成する輝度信号処理手段６と、カメラ制御部３から同軸ケーブル１４を通じて伝送された複合同期信号と制御信号の多重信号からそれぞれの信号を分離する同期分離回路１１及び制御信号分離回路１０と、クロックを生成するＰＬＬ回路１２と、前記クロックからＣＣＤ４を駆動する駆動信号等を発生するタイミング信号発生手段９及び直流電源をヘッド内各部へ供給する電源１３で構成されている。   In FIG. 1, a camera head unit 2 has a single-plate color CCD (solid-state imaging device, hereinafter referred to as CCD) 4 of a complementary color mosaic method or a primary color mosaic method, and a plurality of types of color filters are predetermined on each pixel. A single-plate color CCD 4 arranged in this order, a CDS (correlated double sampling) circuit 5 for removing reset noise of the video signal photoelectrically converted by the CCD 4, and the camera control unit 3 via a cable connection terminal 7. Luminance signal processing means 6 for generating a video signal to be transmitted and a video signal to be output to the monitor output terminal 8, and a composite synchronization signal transmitted from the camera control unit 3 through the coaxial cable 14 and a multiplexed signal of the control signal, respectively. A synchronous separation circuit 11 and a control signal separation circuit 10 for separating, a PLL circuit 12 for generating a clock, and driving the CCD 4 from the clock. A timing signal generator 9 and a DC power source for generating a driving signal or the like which is composed of a power supply 13 for supplying to the head units.

また、カメラ制御部３は、ケーブル接続端子７に接続された同軸ケーブル１４を通じて伝送された前記カメラヘッド部２からの映像信号を、同軸ケーブル長による水平同期信号の遅延量を補正するケーブル補正手段１５と、該ケーブル補正手段１５から入力されたアナログ量の輝度信号を前記画素の配列順序に基づいてサンプリングし所望の規格の映像信号を生成するカラー信号処理手段１６と、カメラヘッド部２へ送出する帰線消去信号、水平同期信号、垂直同期信号等複合同期信号及びこの複合同期信号の垂直帰線消去信号期間内の水平走査期間にカメラヘッド部２を制御する制御信号を重畳して送出する同期・制御信号発生手段１８と、同位相のクロックを発生するＰＬＬ回路１２と、入力端子１９に入力された外部同期信号ＥｘｔＳＹＮＣから垂直同期信号ＶＤ及び水平同期信号ＨＤを分離し生成する同期分離回路１１及びカメラ制御部３内部へ供給する直流電源とカメラヘッド部２へ供給する直流電源を備えた電源２１で構成されている。   Further, the camera control unit 3 corrects the video signal from the camera head unit 2 transmitted through the coaxial cable 14 connected to the cable connection terminal 7 with respect to the delay amount of the horizontal synchronization signal due to the coaxial cable length. 15, a color signal processing means 16 that samples an analog luminance signal input from the cable correction means 15 based on the arrangement order of the pixels and generates a video signal of a desired standard, and sends it to the camera head unit 2. A composite synchronizing signal such as a blanking signal, a horizontal synchronizing signal, a vertical synchronizing signal, and the like, and a control signal for controlling the camera head unit 2 are transmitted in a horizontal scanning period within the vertical blanking signal period of the composite synchronizing signal. The synchronizing / control signal generating means 18, the PLL circuit 12 for generating a clock of the same phase, and the external synchronizing signal ExtS inputted to the input terminal 19 A synchronization separation circuit 11 that separates and generates a vertical synchronization signal VD and a horizontal synchronization signal HD from the NC, and a power source 21 that includes a DC power source that supplies the camera control unit 3 and a DC power source that supplies the camera head unit 2. Yes.

カメラヘッド部２では、カメラ制御部３から同軸ケーブル１４を通じて伝送された複合同期信号と制御信号の多重信号から、複合同期信号は同期分離回路１１によって垂直同期信号ＶＤと水平同期信号ＨＤに分離されてタイミング信号発生手段９及びＰＬＬ回路１２へ供給され、制御信号は制御信号分離回路１０によって分離され連続したそれぞれの制御信号に形成されて各部へ供給される。   In the camera head unit 2, the composite synchronization signal is separated into the vertical synchronization signal VD and the horizontal synchronization signal HD by the synchronization separation circuit 11 from the composite synchronization signal and the control signal multiplexed signal transmitted from the camera control unit 3 through the coaxial cable 14. Are supplied to the timing signal generating means 9 and the PLL circuit 12, and the control signal is separated by the control signal separation circuit 10 to be formed into continuous control signals and supplied to each part.

タイミング信号発生手段９は、同期分離回路１１から入力された垂直同期信号ＶＤ及びＰＬＬ回路１２で水平同期信号ＨＤと位相比較し調相されたクロックＣＬＫに基づいてＣＣＤ４駆動用タイミング信号他カメラヘッド部２内部で使用される各種タイミング信号を発生する。   The timing signal generating means 9 includes a timing signal for driving the CCD 4 based on the vertical synchronizing signal VD inputted from the synchronizing separation circuit 11 and the clock CLK phase-compared by phase comparison with the horizontal synchronizing signal HD by the PLL circuit 12 and other camera head parts. 2 Generate various timing signals used internally.

ＣＣＤ４は、前記タイミング信号発生手段９から供給されたＣＣＤ４の駆動に必要な垂直転送のための４相パルスやフィールドシフトパルス、水平転送のための２相パルス等によって駆動され、図示しない撮像レンズによって複数種の色フィルタが所定の順序で配列された画素上に結像した光学像を光電変換し、画素の配列順序に基づいた輝度信号の前記映像信号を出力する。   The CCD 4 is driven by a four-phase pulse for vertical transfer, a field shift pulse, a two-phase pulse for horizontal transfer, etc. required for driving the CCD 4 supplied from the timing signal generating means 9, and is driven by an imaging lens (not shown). An optical image formed on a pixel in which a plurality of types of color filters are arranged in a predetermined order is photoelectrically converted, and the video signal of the luminance signal based on the arrangement order of the pixels is output.

前記画素の配列順序に基づいた輝度信号の前記映像信号は、タイミング信号発生手段９から供給されたフィードスルーの０レベル期間をサンプルホールドするパルスＳＨＤ、映像信号期間をサンプルホールドするパルスＳＨＰによって作動するＣＤＳ回路５によってリセット雑音が除去され輝度信号処理手段６へ出力される。   The video signal of the luminance signal based on the arrangement order of the pixels is operated by a pulse SHD that samples and holds the feed-through zero level period supplied from the timing signal generation means 9 and a pulse SHP that samples and holds the video signal period. The reset noise is removed by the CDS circuit 5 and output to the luminance signal processing means 6.

前記輝度信号処理手段６は、適切なレベルに増幅された映像信号のガンマ補正、ニー補正、自動レベル補正等の処理と、さらに映像信号に対し、帰線消去信号及びカメラ制御部３における同軸ケーブル補正手段１５の位相比較用水平同期信号として正極性水平パルス等が混合され、任意の出力インピーダンスで直流阻止用コンデンサＣを介してケーブル接続端子７に接続された同軸ケーブル１４によりカメラ制御部３へ標準方式に基づく映像信号が送出される。また、カメラ制御部３からの制御信号を受けて複合同期信号ＣＳの付加をオン／オフできるスイッチＳＷを備え標準方式に基づく映像信号をモニタ出力端子８へ出力することもできる。   The luminance signal processing means 6 performs processing such as gamma correction, knee correction, and automatic level correction of the video signal amplified to an appropriate level, and further applies a blanking signal and a coaxial cable in the camera control unit 3 to the video signal. A positive horizontal pulse or the like is mixed as a phase comparison horizontal synchronizing signal of the correction means 15 and is connected to the camera control unit 3 by a coaxial cable 14 connected to the cable connection terminal 7 via a DC blocking capacitor C with an arbitrary output impedance. A video signal based on the standard system is transmitted. In addition, a switch SW that can turn on / off the addition of the composite synchronization signal CS in response to a control signal from the camera control unit 3 can be provided to output a video signal based on the standard system to the monitor output terminal 8.

カメラヘッド部２からカメラ制御部３へ入力された映像信号は、直流阻止用コンデンサＣを介してケーブル補正手段１５へ入力される。ケーブル補正手段１５へ入力された映像信号はパルスクランプ回路等で黒レベルを固定し、同期・制御信号発生手段１８から入力された水平同期信号ＨＤと、前記カメラヘッド部２からの映像信号に混合された正極性水平パルスを分離した前記位相比較用水平同期信号との位相を比較し同相となるように公知の技術を用いて制御する。その結果、同期・制御信号発生手段１８からカメラヘッド部２へ送出される水平同期信号は、同軸ケーブルの長さによって生じるその遅延量に応じて進相した水平同期信号を含む複合同期信号が送出される。   The video signal input from the camera head unit 2 to the camera control unit 3 is input to the cable correction unit 15 via the DC blocking capacitor C. The video signal input to the cable correction unit 15 is fixed to the black level by a pulse clamp circuit or the like, and mixed with the horizontal synchronization signal HD input from the synchronization / control signal generation unit 18 and the video signal from the camera head unit 2. The phase is compared with the phase comparison horizontal synchronization signal obtained by separating the positive polarity horizontal pulse, and control is performed using a known technique. As a result, the horizontal synchronizing signal sent from the synchronizing / control signal generating means 18 to the camera head unit 2 is a composite synchronizing signal including a horizontal synchronizing signal advanced in accordance with the delay amount caused by the length of the coaxial cable. Is done.

なお、ケーブル補正手段１５では、同軸ケーブル１４の長さに応じて映像信号の高域周波数特性の劣化を補正する自動補正回路又は同軸ケーブル１４の長さに応じて手動又は自動で切換できるＳＷ等を設けることが好ましい。   In the cable correction means 15, an automatic correction circuit that corrects deterioration of the high frequency characteristics of the video signal according to the length of the coaxial cable 14, a SW that can be switched manually or automatically according to the length of the coaxial cable 14, etc. Is preferably provided.

前記ケーブル補正手段１５によって同相に調相されカラー信号処理手段１６へ入力された映像信号は、前記カラー信号処理手段１６において、ＰＬＬ回路１２で生成されたクロックＣＬＫと、同期・制御信号発生手段１８で生成された水平同期信号ＨＤとを位相比較し、水平同期信号ＨＤの位相に合わせたクロックＣＬＫに基づいてＣＣＤ４の各画素上に複数種の色フィルタが所定の順序で配列された画素の配列順序に従った輝度信号を公知の技術を用いてサンプリングして、前記色フィルタに準じたカラー映像信号を生成する。   The video signal phased in phase by the cable correction unit 15 and input to the color signal processing unit 16 is synchronized with the clock CLK generated by the PLL circuit 12 and the synchronization / control signal generation unit 18 in the color signal processing unit 16. Of the horizontal sync signal HD generated in step (1), and a pixel arrangement in which a plurality of types of color filters are arranged in a predetermined order on each pixel of the CCD 4 based on the clock CLK that matches the phase of the horizontal sync signal HD. The luminance signal according to the order is sampled using a known technique to generate a color video signal according to the color filter.

さらに、サンプリングして得たカラー映像信号は、公知の方式に従ってＲ、Ｇ、Ｂ又はＮＴＳＣ等規格化されたカラー信号方式へ変換され、映像出力端子１７へ出力される。   Further, the color video signal obtained by sampling is converted into a standardized color signal system such as R, G, B, or NTSC according to a known system, and is output to the video output terminal 17.

同期・制御信号発生手段１８は、カメラ制御部３の図示しない操作盤のＳＷ等を操作することにより、先に説明したカメラヘッド部２のモニタ出力映像信号に複合同期信号ＣＳの付加をオン／オフする制御信号を垂直帰線信号期間内の水平走査期間に制御信号を重畳して送出するほか、同様にＣＣＤ４の電子シャッタ時間の設定と制御信号や、電子シャッタ時間の設定と制御信号を含むトリガ信号を送出することができ、さらに、外部トリガ信号端子２０から入力された外部トリガ信号Ｅｘｔ．ＴＲＧを同様に垂直帰線信号期間内の水平走査期間に制御信号として重畳して送出することができる。前記トリガ信号による制御は、アトランダムに制御できる方式とすることが好ましい。   The synchronization / control signal generator 18 turns on / off the addition of the composite synchronization signal CS to the monitor output video signal of the camera head unit 2 described above by operating the SW of the operation panel (not shown) of the camera control unit 3. The control signal to be turned off is transmitted by superimposing the control signal in the horizontal scanning period within the vertical blanking signal period, and similarly includes the electronic shutter time setting and control signal of the CCD 4 and the electronic shutter time setting and control signal. The trigger signal can be transmitted, and the external trigger signal Ext. Similarly, TRG can be transmitted as a control signal superimposed on a horizontal scanning period within a vertical blanking signal period. The control by the trigger signal is preferably a system that can be controlled at random.

カメラヘッド部２では、伝送された制御信号を制御信号分離回路１０で複合同期信号から分離して、公知の技術を用いて連続した制御信号を生成してタイミング信号発生手段９等を制御してＣＣＤ４の電子シャッタ動作等所望の動作を行わせることができる。   In the camera head unit 2, the transmitted control signal is separated from the composite synchronization signal by the control signal separation circuit 10, and a continuous control signal is generated using a known technique to control the timing signal generating means 9 and the like. A desired operation such as an electronic shutter operation of the CCD 4 can be performed.

前記カメラ制御部３が、図示しない外部機器と同期できる外部同期手段を備えているので、外部同期入力端子１９から入力された外部同期信号ＥｘｔＳＹＮＣを同期分離回路１１へ入力し、該同期分離回路１１から同期信号ＨＤ、ＶＤをＰＬＬ回路１２や、同期・制御信号発生手段１８へ供給することにより本ヘッド分離型単板式カラーカメラ装置１を外部同期制御でき、さらに、本願発明の複数のヘッド分離型単板式カラーカメラ装置１を外部同期制御すれば、複数のヘッド分離型単板式カラーカメラ装置１の画像切換、合成等を容易に、かつ精度良く制御することができる。   Since the camera control unit 3 includes external synchronization means that can synchronize with an external device (not shown), the external synchronization signal ExtSYNC input from the external synchronization input terminal 19 is input to the synchronization separation circuit 11, and the synchronization separation circuit 11 By supplying the synchronization signals HD and VD to the PLL circuit 12 and the synchronization / control signal generating means 18, the head-separated single-plate color camera device 1 can be externally synchronized, and the plurality of head-separated types of the present invention can be controlled. If the single-panel color camera device 1 is externally synchronized, image switching and composition of the plurality of head-separated single-panel color camera devices 1 can be controlled easily and accurately.

前記カメラ制御部３が、商用交流電源入力端子２２から入力された商用交流電源ＡＣから電源２１によって直流電源を生成し、該直流電源をカメラ制御部３内部各回路へ供給するほか、ケーブル接続端子７に直流電源を接続しカメラ制御部３から送出する同期信号に直流電源を重畳して送出する。カメラヘッド部２では電源１３により同期信号及び制御信号等を取り除き安定化された直流電源を各部へ供給する。カメラヘッド部２及びカメラ制御部３ともに重畳された直流電源とと、映像、複合同期信号及び制御信号との分離のためそれぞれのケーブル接続端子７の両端に直流阻止コンデンサＣが接続されている。   The camera control unit 3 generates a DC power source from the commercial AC power source AC input from the commercial AC power source input terminal 22 by the power source 21 and supplies the DC power source to each circuit inside the camera control unit 3. 7 is connected to a DC power supply, and the DC power supply is superimposed on the synchronization signal sent from the camera control unit 3 and sent out. The camera head unit 2 removes synchronization signals and control signals from the power source 13 and supplies a stabilized DC power source to each unit. A DC blocking capacitor C is connected to both ends of each cable connection terminal 7 in order to separate the DC power source superimposed on both the camera head unit 2 and the camera control unit 3 and the video, composite synchronization signal, and control signal.

なお、本カラーカメラ装置１では、カメラヘッド部２内部にＣＣＤ４を駆動するタイミング信号発生手段９をＣＣＤ４に近接して配設でき、また、カメラヘッド部２とカメラ制御部３を１本の同軸ケーブル１４で接続し、伝送された輝度信号の映像信号を同相のクロックでサンプリングしてカラー画像を生成する方式のため、ＮＴＳＣ方式のものに限らず、ＰＡＬ方式など他の規格の方式や、さらに、ＨＤＴＶ方式など高精細画像対応の固体撮像デバイスを使用したヘッド分離型単板式カラーカメラ装置にも容易に対応できる。   In the color camera device 1, the timing signal generating means 9 for driving the CCD 4 can be disposed in the camera head unit 2 in the vicinity of the CCD 4, and the camera head unit 2 and the camera control unit 3 are arranged on one coaxial line. Since it is a method of generating a color image by sampling the video signal of the transmitted luminance signal with an in-phase clock by connecting with the cable 14, it is not limited to the NTSC method, and other standard methods such as the PAL method, In addition, it can be easily applied to a head-separated single-plate color camera device using a solid-state imaging device that supports high-definition images such as HDTV.

上記はアナログ方式のヘッド分離型単板式カラーカメラ装置１として説明したが、カメラヘッド部２のＣＤＳ回路５をはじめ輝度信号処理手段６及びカメラ制御部３を含めてデジタル化し、デジタル信号を同軸ケーブル１４で伝送する方式としてもよい。   The above has been described as an analog head-separated single-plate color camera device 1, but the digital signal including the luminance signal processing means 6 and the camera control unit 3 including the CDS circuit 5 of the camera head unit 2 is digitized and the digital signal is coaxial cable 14 may be used for transmission.

上記実施例において、カメラ制御部３は商用交流電源ＡＣで作動するほか、カメラ制御部３内部にＤＣ−ＤＣコンバータを備えて、外部ＤＣ電源で作動するようにしてもよい。   In the above embodiment, the camera control unit 3 may be operated by a commercial AC power supply AC, or may be provided with a DC-DC converter inside the camera control unit 3 and operated by an external DC power supply.

超小型化が可能なカメラヘッド部と、カメラ制御部とを１本の同軸ケーブルで接続でき、かつ、外部トリガ信号でランダムトリガ制御が可能で、さらに複数の機器と外部同期もできるヘッド分離型単板式カラーカメラ装置のため、ＶＧＡ方式等画像処理用、ＦＡ用、歯科治療用超小型カラーカメラ等の産業に利用できる。   A head-separated type that can connect the camera head unit, which can be miniaturized, and the camera control unit with a single coaxial cable, can be controlled with an external trigger signal, and can be synchronized with multiple devices. Since it is a single-plate color camera device, it can be used in industries such as VGA type image processing, FA, and ultra-small color cameras for dental treatment.

本願発明実施例のヘッド分離型単板式カラーカメラ装置のブロック図。1 is a block diagram of a head-separated single-plate color camera device according to an embodiment of the present invention. 従来例のカメラヘッド部とカメラ制御部が分離した単板式カラーカメラ装置のブロック図。The block diagram of the single plate type color camera apparatus which the camera head part and camera control part of the prior art example isolate | separated.

符号の説明Explanation of symbols

１：ヘッド分離型単板式カラーカメラ装置
２：カメラヘッド部 ３：カメラ制御部
４：ＣＣＤ ５：ＣＤＳ回路
６：輝度信号処理手段 ７：ケーブル接続端子
８：モニタ出力端子 ９：タイミング信号発生手段
１０：制御信号分離回路 １１：同期分離回路
１２：ＰＬＬ回路 １３：電源
１４：同軸ケーブル １５：ケーブル補正手段
１６：カラー信号処理手段 １７：出力端子
１８：同期・制御信号発生手段 １９：外部同期入力端子
２０：外部トリガ信号端子 ２１：電源
２２：商用交流電源入力端子
１０１：単板式カラーカメラ装置 １０２：カメラヘッド部
１０３：カメラ制御部 １０４：単板カラーＣＣＤ
１０５：ＣＤＳ回路 １０６：カラー信号処理手段
１０７：Ｖドライバ １０８：Ｈドライバ
１０９タイミング信号発生手段 １１０：ＣＬＫ発生回路
１１１：電源 ＡＣ：商用交流電源
ＥｘｔＴＲＧ：外部トリガ信号 ＥｘｔＳＹＮＣ：外部同期信号
ＣＳ：複合同期信号 ＳＷ：スイッチ
1: head-separated single-plate color camera device 2: camera head unit 3: camera control unit 4: CCD 5: CDS circuit 6: luminance signal processing means 7: cable connection terminal 8: monitor output terminal 9: timing signal generation means 10 : Control signal separation circuit 11: synchronization separation circuit 12: PLL circuit 13: power supply 14: coaxial cable 15: cable correction means 16: color signal processing means 17: output terminal 18: synchronization / control signal generation means 19: external synchronization input terminal 20: External trigger signal terminal 21: Power supply 22: Commercial AC power input terminal 101: Single plate color camera device 102: Camera head unit 103: Camera control unit 104: Single plate color CCD
105: CDS circuit 106: Color signal processing means 107: V driver 108: H driver 109 Timing signal generation means 110: CLK generation circuit 111: Power supply AC: Commercial AC power supply ExtTRG: External trigger signal ExtSYNC: External synchronization signal CS: Composite synchronization Signal SW: Switch

Claims (7)

カメラヘッド部とカメラ制御部が分離した単板式カラーカメラ装置において、前記カメラ制御部から送出された同期信号に同期したクロックで固体撮像デバイスから読み出され画素の配列順序に基づいた映像信号を出力するカメラヘッド部と、前記カメラヘッド部から入力された映像信号と同位相のクロックにより前記映像信号をサンプリングしてカラー映像信号を出力する前記同位相のクロック及び同期信号を生成する同期信号発生手段を備えたカメラ制御部とで構成してなることを特徴とするヘッド分離型単板式カラーカメラ装置。   In a single-plate color camera device in which the camera head unit and camera control unit are separated, a video signal read out from the solid-state imaging device with a clock synchronized with the synchronization signal sent from the camera control unit is output based on the pixel arrangement order And a synchronization signal generating means for generating the in-phase clock and the synchronization signal for sampling the image signal by a clock having the same phase as the image signal inputted from the camera head unit and outputting a color image signal A head-separated single-plate color camera device, comprising: 前記カメラヘッド部から送出する映像信号と、カメラ制御部から送出する同期信号とが、一本の同軸ケーブルに重畳して送受されてなることを特徴とする請求項１に記載のヘッド分離型単板式カラーカメラ装置。   2. The head-separated single unit according to claim 1, wherein the video signal transmitted from the camera head unit and the synchronization signal transmitted from the camera control unit are transmitted and received superimposed on one coaxial cable. Plate type color camera device. 前記カメラ制御部が、さらにカメラヘッド部との接続同軸ケーブルによる水平同期信号の遅延量を補正するケーブル補正手段を備え、
前記ケーブル補正手段が、カメラヘッド部から送り返された水平同期信号と、前記同期信号発生手段で生成された水平同期信号との位相差を検知し同相に制御してなることを特徴とする請求項１又は２に記載のヘッド分離型単板式カラーカメラ装置。 The camera control unit further includes cable correction means for correcting a delay amount of a horizontal synchronization signal by a coaxial cable connected to the camera head unit,
The cable correction unit detects a phase difference between a horizontal synchronization signal sent back from the camera head unit and a horizontal synchronization signal generated by the synchronization signal generation unit, and controls the phase difference to be in phase. 3. A head-separated single-plate color camera device according to 1 or 2. 前記カメラ制御部が、該カメラ制御部から送出する同期信号にカメラヘッド部を制御する制御信号を重畳して送出する手段を備えてなることを特徴とする請求項１〜３のいずれか１項に記載のヘッド分離型単板式カラーカメラ装置。   The said camera control part is provided with the means to superimpose and send out the control signal which controls a camera head part on the synchronous signal sent out from this camera control part, The any one of Claims 1-3 characterized by the above-mentioned. 2. A head-separated single-plate color camera device according to 1. 前記カメラ制御部が、外部機器と同期できる外部同期手段を備えてなることを特徴とする請求項１〜４のいずれか１項に記載のヘッド分離型単板式カラーカメラ装置。   5. The head-separated single-plate color camera device according to claim 1, wherein the camera control unit includes an external synchronization unit that can synchronize with an external device. 前記カメラ制御部が、該カメラ制御部から送出する同期信号に直流電源を重畳して送出する手段と、前記カメラヘッド部が、前記カメラ制御部から送出された同期信号と直流電源の分離手段とを備えてなることを特徴とする請求項１〜５のいずれか１項に記載のヘッド分離型単板式カラーカメラ装置。   Means for superimposing and sending a DC power supply on a synchronization signal sent from the camera control section; and means for separating the synchronization signal sent from the camera control section from the DC power supply. 6. The head-separated single-plate color camera device according to claim 1, comprising: 前記カメラヘッド部が、標準方式に基づく映像信号を出力する手段を備えてなることを特徴とする請求項１〜６のいずれか１項に記載のヘッド分離型単板式カラーカメラ装置。
7. The head-separated single-plate color camera device according to claim 1, wherein the camera head unit includes means for outputting a video signal based on a standard system.
JP2004372262A 2004-12-22 2004-12-22 Head separation type single panel type color camera device Pending JP2006180293A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009225146A (en) * 2008-03-17 2009-10-01 Nec Corp Revolution camera apparatus, temperature control method and temperature control program used for the revolution camera apparatus
JP2010062650A (en) * 2008-09-01 2010-03-18 Hitachi Kokusai Electric Inc Video transmission system
US7728876B2 (en) 2008-03-31 2010-06-01 Kabushiki Kaisha Toshiba Imaging apparatus having camera control unit and separate camera head
CN113329200A (en) * 2021-06-07 2021-08-31 广州市奥威亚电子科技有限公司 Clock synchronization data transmission device based on coaxial cable

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009225146A (en) * 2008-03-17 2009-10-01 Nec Corp Revolution camera apparatus, temperature control method and temperature control program used for the revolution camera apparatus
US7728876B2 (en) 2008-03-31 2010-06-01 Kabushiki Kaisha Toshiba Imaging apparatus having camera control unit and separate camera head
JP2010062650A (en) * 2008-09-01 2010-03-18 Hitachi Kokusai Electric Inc Video transmission system
CN113329200A (en) * 2021-06-07 2021-08-31 广州市奥威亚电子科技有限公司 Clock synchronization data transmission device based on coaxial cable
CN113329200B (en) * 2021-06-07 2024-03-15 广州市奥威亚电子科技有限公司 Clock synchronous data transmission device based on coaxial cable

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