Other

James Neill Holdings Limited

Establissements Pierre Angenieux Sa

Comtech Research

John D Bradbrook

Robert M Pettigrew

John H Fisher

Alan M Smith

Ronald C Wainwright

Peter J Bassett

John D Anderson

Nicholas M Goy

A camera zoom lens system comprising; means for generating and storing a first information signal representing a predetermined position of the first movable lens group, means for generating a second information signal whose value determines a relationship between the respective positions of said first and second movable lens groups, first computing means for deriving from the stored first information signal a third signal representing the position to which the second movable lens group must move so that both lens groups produce an in-focus image of the object at infinity, second computing means responsive to the first and second information signals for generating a correction signal which when combined with the third signal produces an output signal representing the position to which the second movable lens group must move so that both lens groups will produce an in-focus image of an object at a specified distance, third computing means responsive to the correction signal and the third signal for generating and storing a fourth signal for the second movable lens group; sensing means for producing additional information signals relating to the actual positions of said lens groups, a central processor unit responsive to the first, fourth and additional signals for producing two error signals corresponding to any discrepancy between the actual positions of said lens groups and the positions represented by said first and fourth signals respectively, and means responsive to said error signals for moving the lens groups respectively to positions corresponding to said first and fourth signals.

Zoom lens for cameras

Information storage and retrieval

A thermoplastics data storage member carries information which can be imaged using non-coherent light and, in addition to and distinct from that information, control data which defines a two-coordinate system for the member which controls random access to the information. A reading apparatus comprises a non-laser optical system for imaging selected areas of the information and a servo-system, including a microprocessor and transducers for reading the control data, for positioning a reading head of the optical system in desired locations relative to the storage member. The invention affords cheap optical data bases readable by apparatus not requiring a laser optical system.

Optical data storage

A hand held digital read-out measuring instrument in which interference fringes are generated by the transmission of radiations through gratings which move relative to one another according to a distance being measured and the fringes are counted to detect changes in the fringe pattern and generate a pulse output related to the distance, means being provided to control the rate of movement and to exert a substantially constant force on the movable elements.

Distance measuring gauge

Growing community of inventors

Royston, United Kingdom

John D Bradbrook