VIDICON HAVING MESH ON END OF CYLINDER COAXIAL WITH ANODE

• US 3,864,585 A
• Filed: 07/05/1973
• Issued: 02/04/1975
• Est. Priority Date: 07/06/1972
• Status: Expired due to Term

• Current Assignee: Hans Scholz
• Original Assignee: Hans Scholz
• Inventors: Scholz, Hans
• Primary Examiner(s): Segal, Robert
• Application Number:
  US05/376,551
• Time in Patent Office: 579 Days
• Field of Search: 315/8,65A,65R,389,390,382,383
• US Class Current: 313/390
• CPC Class Codes: H01J 29/92 Means forming part of the tube for the purpose of providing electrical connection to it

Abstract

A separate mesh vidicon in which in order to reduce voltage pick-up from the scanning field by the conductor system which makes connection to the mesh and at the same time provide a tube which is relatively insensitive to rotation about its axis when positioned within its scanning yoke, connection to the mesh is made within the area occupied in operation, by the scanning field, by a cylindrical conductor surrounding the usually provided cylindrical anode, the remainder of the connection path being provided by a number of conductors arranged symmetrically about the axis of the tube.

Claims

1. A vidicon tube including within an envelope, a target, a target electrode in electrical contact with the target, an anode of which the portion nearest the target is cylindrical, a field mesh electrically isolated from the positioned closely adjacent the target electrode between the target electrode and the cylindrical portion of the anode, terminal means passing through the envelope, and electrical connection means electrically connecting the terminal means to the field mesh;

wherein, the electrical connection means includes a conductive cylindrical member coaxial with and surrounding the anode and extending at least approximately to the end of the cylindrical portion of the anode, the opposite end portions of the cylindrical member being electrically connected, respectively, to the perimeter of the field mesh and to a plurality of electrical conductors which are disposed symmetrically about the axis of the tube and extend to the terminal means.

2. A tube as claimed in claim 1, wherein there are two current paths each consisting of a wire.

3. A tube as claimed in claim 1, wherein the tubular anode electrode is tapered at the end of its cylindrical portion, and wherein said conductive cylindrical member extends from the field mesh to the beginning of the taper.

4. A tube as claimed in claim 3, wherein the combined wall thickness of said conductive cylindrical member and said anode is approximately equal to 0.004 inch.

5. In a vidicon tube of the type including an evacuted envelope adapted to be received and adjustably oriented within a scanning yoke, said envelope having a face plate portion at one end and having an externally accessible electrode projecting through the envelope wall at its other end, a vidicon target electrode on the inner surface of said face plate portion, a tubular anode electrode within said envelope extending from adjacent said other end of said envelope to a position spaced from but adjacent said target electrode, and a field mesh electrode positioned across the space between said tubular anode electrode and said target electrode closely adjacent said target electrode, the improvement comprising;

an electrically conductive, non-magnetic cylinder electrically connected at one end thereof to said field mesh electrode and extending therefrom in concentric, surrounding relation to said tubular anode electrode over at least a major portion of the length thereof; and

at least a pair of electrical conductors connecting that end of said cylinder which is remote from said target electrode to said externally accessible electrode, said conductor being arranged symmetrically about the axis of the tube and said cylinder being of sufficient length as to provide maximum reduction of line scan pick-up with minimum sensitivity to orientation of said tube within the scanning yoke.