Hitachi, Ltd.

Hitachi Medical Corporation

Hideyuki Sakai

Masakazu Fukushima

Masanori Maruyama

Hisatake Yokouchi

Satoru Miyamoto

Fumitaka Takahashi

Masashi Mizushima

Shigeru Ehata

Shinji Otsuka

Kinjir Gunbe

An image input apparatus including a camera tube having a photoconductive layer onto which an optical image is to be projected, a cathode for emitting an electron beam for scanning the photoconductive layer, a control electrode for controlling a beam current of the electron beam emitted from the cathode in accordance with a control voltage, and a mesh electrode having a frame, the apparatus further including a deflecting circuit for periodically deflecting the electron beam to scan the photoconductive layer. The deflecting circuit periodically deflects the electron beam to scan an area outside a restricted scanning area determined by the frame of the mesh electrode. A beam current control circuit is further added, if necessary, for generating a control voltage and applying the control voltage to the control electrode to control the beam current of the electron beam such that the electron beam does not collide with the frame of the mesh electrode during a period in which the electron beam scans the area outside the restricted scanning area.

Image input apparatus

A television camera tube with electrostatic focusing and magnetic deflection comprises in an cylindrical envelope a beam current control, a main lens section and a sixth grid in the form of a mesh electrode. The beam current control section includes a cathode, a first grid and a second grid with an electron beam limiting diaphragm in this order. The main lens section includes third, fourth and fifth grids in the form of cylindrical electrodes disposed in this order. Around the cylindrical envelope is mounted a magnetic deflection coil whose length along the envelope axis is 0.18 to 0.40 times the distance from the beam limiting diaphragm to the mesh electrode.

Television camera tube with electrostatic focusing and magnetic

An integrated pickup component used to support and mount thereto image pickup tubes is mounted to a color separation optical system of a multi-tube type color television camera. The integrated pickup component comprises a plurality of primary assembly retaining cylinders each housing an image pickup tube and its peripheral parts which are to be fixed to the cylinder with an adhesive in a ready-to-use manner, and a mount holder integrally formed in itself for attaching thereto the primary assembly retaining cylinders of respective image pickup tubes. Before connecting and fixing this integrated pickup component to the color separation optical system of the color television camera, the component is attached to an adjusting arrangement having an optical system with identical functions to those of the color separation optical system for the camera. The relative positions between each of the primary assembly retaining cylinders and the mount holder are adjusted by monitoring with a picture monitor the correct registration of the color separated optical images with the electron beam scanning areas in respect of their focus points, the sizes, the rotational positions and the center positions through the use of the optical system of the adjusting arrangement. Relative positions thus adjusted are then fixed with an adhesive.

Integrated pickup component and adjusting arrangement therefor

The electron lens of an electrostatically focusing type image pickup tube comprises three coaxially arranged cylindrical electrodes and the inner diameters thereof are decreased from the side of a target toward an electron gun. The electron lens is assembled by successively fitting the three electrodes over a mandrel, the outer diameter thereof varying stepwisely in accordance with the inner diameters of the three electrodes, and then interconnecting the three electrodes by axially extending insulating supporting rods.

Electrostatically focusing type image pickup tubes and method of

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Mobara, Japan

Hideyuki Sakai