U.S. Philips Corporation

Pamela May Stubberfield

Hewson Nicholas King

Derek Washington

Pieter Schagen

Daphne L Lamport

John R Mansell

Roger Pook

A channel plate electron multiplier of the discrete dynode type formed from conductive sheets which are stacked in closely spaced relation. Each sheet is perforated with apertures which are aligned to form electron multiplying channels. The apertures in each sheet have input and output and cross sections which are approximately the same size and a concave shaped inner surface profile which causes a majority of electrons to strike the inner surface close to the output end, whereby the gain of the multiplier is increased.

Electron multipliers

A color cathode ray tube having a screen with concentric phosphor ring patterns and an electron multiplying channel plate between the screen and the electron gun, the channel plate including a focusing control electrode having a constant focusing action.

Color tube having concentric phosphor ring pattern and electron

A channel plate electron multiplier having channels which rapidly decrease in cross-section away from the input aperture and a conductive structure extending across the input aperture to flatten any fringing electrostatic field, resulting in an electrostatic field configuration which causes secondary emitted electrons to collide with the same side of the channel.

Electron multipliers having tapered channels

A flat large-area photocathode intended for use in an intensifier tube is constructed so that a pre-determined potential gradient can be maintained across its surface in operation in order to simplify the electron-optical system of the intensifier. This is done by providing photoemissive material on an electrically resistive layer or sheet on a major surface of which is provided a series of spaced rings of electrically conductive material one inside the other. The spacings and widths of the rings are chosen so that, when a potential difference is applied between the center and the edge of the sheet or layer, the desired potential gradient is set up across the surface of the photocathode. The intensifier tube may be an x-ray image intensifier.

Growing community of inventors

Salfords, near Redhill, United Kingdom

Pamela May Stubberfield