Rare gas cold cathode discharge tube and image input device
First Claim
Patent Images
1. A rare gas cold cathode discharge tube comprising:
- a tube charged with a rare gas;
a pair of spaced main electrodes in said tube, one of said main electrodes generating an electron beam when the tube is powered;
an auxiliary electrode extending along at least a portion of said tube in the direction of the length thereof; and
a conductive member substantially surrounding said tube in the region of one of said main electrodes for stabilizing the discharge, said conductive member being electrically connected to said auxiliary electrode.
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Abstract
An image input device including a rare gas cold cathode discharge tube is provided to read an irradiated picture image using a photoelectric transducer element. The rare gas cold cathode tube includes a linear tube including a main electrode, an auxiliary electrode and a conductive member connected to the auxiliary electrode for preventing deflections of a positive column formed along the auxiliary electrode. The tube is successively powered on and off. Three of such tubes of different colors may be provided and the irradiated picture image may be read by a storage type photoelectric transducer element.
17 Citations
25 Claims
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1. A rare gas cold cathode discharge tube comprising:
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a tube charged with a rare gas; a pair of spaced main electrodes in said tube, one of said main electrodes generating an electron beam when the tube is powered; an auxiliary electrode extending along at least a portion of said tube in the direction of the length thereof; and a conductive member substantially surrounding said tube in the region of one of said main electrodes for stabilizing the discharge, said conductive member being electrically connected to said auxiliary electrode. - View Dependent Claims (2, 3)
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4. A rare gas cold cathode discharge tube comprising:
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a linear tube charged with a rare gas; a pair of spaced main electrodes in said tube, one of said main electrodes generating an electron beam when the tube is powered; an auxiliary electrode extending along at least a portion of said linear tube in the direction of the length thereof; and a conductive member positioned near said one of said main electrodes for preventing defections of a positive column extending essentially parallel to said auxiliary electrode from one of said main electrodes. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A rare gas cold cathode discharge tube comprising:
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a linear tube charged with a rare gas; a pair of spaced main electrodes in said linear tube, one of said main electrodes generating an electron beam when the linear tube is powered; an auxiliary electrode extending along at least a portion of said linear tube in a direction of the length thereof; a conductive member substantially surrounding said linear tube in the region of one of said main electrodes for preventing defection of a positive column extending from said one of said main electrodes essentially parallel to said auxiliary electrode, said conductive member being electrically connected to said auxiliary electrode; and discharge tube lighting circuit for supplying electrical power, two output terminals of said discharge tube lighting circuit are connected respectively to the corresponding main electrodes, and said auxiliary electrode and said conductive member are connected to one of the output terminals of said discharge tube lighting circuit. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification