Camera Tube

14,000,000 Leading Edge Experts on the ideXlab platform

Scan Science and Technology

Contact Leading Edge Experts & Companies

Scan Science and Technology

Contact Leading Edge Experts & Companies

The Experts below are selected from a list of 48 Experts worldwide ranked by ideXlab platform

Chun-lin Shen - One of the best experts on this subject based on the ideXlab platform.

  • Preliminary study of supersensitive Camera Tube
    Photoelectronic Detection and Imaging: Technology and Applications '93, 1993
    Co-Authors: Pan-ao Chen, Chun-lin Shen
    Abstract:

    For lack of sensitivity, conventional HDTV Cameras can't obtain satisfactory picture quality. A super-sensitive HDTV Camera Tube, HARPICON (10 times as sensitive as the Saticon), and a new Camera Tube (more sensitive than the HARPICON) are proposed. The later combines a microchannel plate (MCP) as the electron image storage, a field emission array cathode (FEAC), and high-performance electron-optics. The performances of two experimental Saticon are also given in this paper.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

K. Tanioka - One of the best experts on this subject based on the ideXlab platform.

  • Invention of highly sensitive HARP Camera Tube and its application
    4th IEEE International Conference on Vacuum Electronics 2003, 2003
    Co-Authors: K. Tanioka
    Abstract:

    In 1985, I found that when an amorphous selenium (a-Se) photoconductive target for Camera Tubes is operated in a strong electric field of about 10/sup 8/ V/m, continuous and stable avalanche multiplication takes place, allowing high sensitivity to be obtained with little picture degradation. Based on this discovery, we went on to develop a new kind of Camera Tube called HARP (high-gain avalanche rushing amorphous photoconductor), which has been studied to this day to achieve further increases in sensitivity and a wider range of applications. HARP Camera Tubes, which have achieved sensitivities roughly 100 times greater than CCDs, can serve as a powerful tool for reporting breaking news at night and other low-light conditions, the production of scientific programs, and numerous other applications.

  • Super high sensitive Camera Tube for HDTV hand-held Cameras
    Cameras and Systems for Electronic Photography and Scientific Imaging, 1995
    Co-Authors: Masakazu Nanba, Tadaaki Hirai, T. Yamagishi, Saburo Okazaki, K. Tanioka, Yoshiro Takiguchi, Misao Kubota, Tsutomu Kato, Yukio Takasaki
    Abstract:

    We have developed a compact HDTV Camera Tube that combines high sensitivity with high resolution and is compact enough for hand-held Cameras. This new Camera Tube employs an 8-micrometers -thick HARP (High-gain Avalanche Rushing amorphous Photoconductor) target. Unlike other photoconductors, this target is unique in that its sensitivity can be increased to very high levels to cope with darker illumination. In addition, we have achieved high resolution over the entire picture through the use of a new all-electrostatic focusing and deflection system in the 18-mm-diameter Tube that facilitates the use of a narrow electron beam while assuring the optimal suppression of aberration. a prototype hand-held HDTV Camera equipped with three of these Camera Tubes has attained a maximum sensitivity of 2,000 lux at f/25 (normal gain) and a limiting resolution of more than 1,400 TV lines.© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

  • 1-Inch high-performance HDTV HARP Camera Tube
    1993
    Co-Authors: T. Yamagishi, Masakazu Nanba, N. Egami, Saburo Okazaki, K. Tanioka
    Abstract:

    In order to realize high-resolution, high-sensitivity HDTV Cameras, we developed an HDTV Camera Tube that combines a 4μm-thick HARP target with a 1-inch all-electrostatic focusing-deflecting system. The system features a unipotential lens that is shifted closer to the target

  • High-Sensitivity HDTV Camera Tube with a HARP Target
    SMPTE Journal, 1990
    Co-Authors: N. Egami, T. Yamagishi, K. Tanioka, M. Kurashige, S. Okazaki, S. Ehata
    Abstract:

    High-definition television (HDTV) Cameras must have a high signal-to-noise ratio (SNR) and considerable depth of focus. Conventional Cameras with Saticon® Tubes cannot satisfy these two contradictory requirements because the sensitivity of the Tubes is insufficient. In order to make a better HDTV handheld Camera, a new combination of electron optics and the high-gain avalanche rushing amorphous photoconductor (HARP) target is proposed. A ⅔-in. (18mm) magnetic-focus electrostatic-deflection (MS) system provided with a unique axial-twist pattern-yoke was devised to conform with a HARP target. This resulted in a new Camera Tube 10 times as sensitive as a conventional Tube, an amplitude response (AR) of 30% at 800 TV lines in the ITE AR chart, and good uniform resolution over the entire picture area with no sacrifice in lag or shading.

  • avalanche mode a se photoconductive target for high sensitive Camera Tube
    The Journal of The Institute of Image Information and Television Engineers, 1990
    Co-Authors: K. Tanioka, Kawabe Taketoshi, J Yamazaki, T. Kawamura, Tadaaki Hirai, Yukio Takasaki, Keiichi Shidara, Takaaki Unnai
    Abstract:

    アモルファスSe (a-Se) を主成分とする光導電ターゲットを強い電界で動作させると, アバランシェ (なだれ) 増倍作用により, 極めて高い感度が得られることを見出した.a-Seターゲットに240Vの電圧を印加した場合, 青色光 (B光) に対する量子効率 (単位入射光子数当たりの出力電子数, 以下η) が10となり, 従来の阻止型ターゲットを用いた光導電型撮像管の感度の理論限界 (η=1) をはるかに上回る高い感度が得られた.このときの暗電流は0.2nAと小さかった.また, アバランシェ増倍に伴う残像, 解像度等の特性劣化は認められなかった.試作管を実装したカラーカメラでは, 被写体照度180lx, レンズ絞りF4の条件で, 従来のスタジオカメラの標準撮像時 (2000lx, F4) とほぼ同等の良好な画像が得られた.

Gregory J. Murphy - One of the best experts on this subject based on the ideXlab platform.

  • Application of a Plumbicon TV Camera Tube in a 2000-line imaging system
    Medical Imaging 1994: Physics of Medical Imaging, 1994
    Co-Authors: Gregory J. Murphy, William Bitler, John Lybrook, Timothy L. Stevener, Marc W. Broemmelsiek
    Abstract:

    In 1990 a new high resolution Plumbicon Camera Tube development was presented at SPIE Medical Imaging IV. At that time, image processors were not readily available to take advantage of the performance capabilities of this imaging device. This paper presents the result obtained with the latest imaging system capable of utilizing the performance advantages of high resolution Camera Tubes.

  • Importance of TV Camera Tube parameters in fluoroscopic imaging
    Medical Imaging VI: Instrumentation, 1992
    Co-Authors: William Bitler, James G. Coffin, Walter Doesschate, Robert M. Langdon, Gregory J. Murphy
    Abstract:

    In the search for better ftuoroscopic imaging, the TV Camera Tube performance has become more critical. Traditional Camera Tube test methods, which expose Tubes to extreme conditions, have only marginal correlation to typical fluoroscopic usage. This paper compares these traditional measurements with test measurements made on a modern fluoroscopic digital system for two different types of TV Camera Tubes. The results obtained show how the x-ray system influences the importance of the TV Camera Tube parameters and which Tube features are most relevant.

Pan-ao Chen - One of the best experts on this subject based on the ideXlab platform.

  • Preliminary study of supersensitive Camera Tube
    Photoelectronic Detection and Imaging: Technology and Applications '93, 1993
    Co-Authors: Pan-ao Chen, Chun-lin Shen
    Abstract:

    For lack of sensitivity, conventional HDTV Cameras can't obtain satisfactory picture quality. A super-sensitive HDTV Camera Tube, HARPICON (10 times as sensitive as the Saticon), and a new Camera Tube (more sensitive than the HARPICON) are proposed. The later combines a microchannel plate (MCP) as the electron image storage, a field emission array cathode (FEAC), and high-performance electron-optics. The performances of two experimental Saticon are also given in this paper.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

William Bitler - One of the best experts on this subject based on the ideXlab platform.

  • Application of a Plumbicon TV Camera Tube in a 2000-line imaging system
    Medical Imaging 1994: Physics of Medical Imaging, 1994
    Co-Authors: Gregory J. Murphy, William Bitler, John Lybrook, Timothy L. Stevener, Marc W. Broemmelsiek
    Abstract:

    In 1990 a new high resolution Plumbicon Camera Tube development was presented at SPIE Medical Imaging IV. At that time, image processors were not readily available to take advantage of the performance capabilities of this imaging device. This paper presents the result obtained with the latest imaging system capable of utilizing the performance advantages of high resolution Camera Tubes.

  • Importance of TV Camera Tube parameters in fluoroscopic imaging
    Medical Imaging VI: Instrumentation, 1992
    Co-Authors: William Bitler, James G. Coffin, Walter Doesschate, Robert M. Langdon, Gregory J. Murphy
    Abstract:

    In the search for better ftuoroscopic imaging, the TV Camera Tube performance has become more critical. Traditional Camera Tube test methods, which expose Tubes to extreme conditions, have only marginal correlation to typical fluoroscopic usage. This paper compares these traditional measurements with test measurements made on a modern fluoroscopic digital system for two different types of TV Camera Tubes. The results obtained show how the x-ray system influences the importance of the TV Camera Tube parameters and which Tube features are most relevant.