Etablissements Pierre Angenieux

Thomson-csf

Andre A Masson

Francis Jourdan

Jean-Paul Lepeytre

Charles Le Roux

The variable-focal-length objective for motion-picture cameras and especially color television cameras comprises two movable groups of lens elements placed between two stationary groups of lens elements and capable of displacement so as to produce a variation of the focal distance. In this objective, the two movable groups each take part in the total variation of magnification; each elementary magnification has a minimum and maximum absolute value during the variation, such that the ratio of maximum value to minimum value is higher than 1:1. However, only one of the two movable groups which does not pass through a magnification of unity performs both a magnification function and an additional focusing function. On the other hand, the other movable group which may pass through a position corresponding to a magnification of unity performs only a magnification function.

Variable-focal-length objective

These device and method for adjusting the value of the chromatism and distortion aberrations in an optical system, notably for color television cameras, by using a diascope from which a color image is injected into the optical system, comprises an assembly of at least four prismatic blades forming two optically parallel groups of variable thickness, each group comprising two such blades, the blades consisting of transparent materials having the same index of refraction and the same index of dispersion of the blades of the same group, but a different index of dispersion for each group, with control means for varying the thickness of each group while preserving a constant total thickness.

Device and method for adjusting the value of chromatism aberrations in

An optical device comprising at least an optical element having a cut away area and which supports an inner mechanical structure accommodated in the cut away area, the whole being supported by an outer mechanical structure without obstruction in the optical path between the structures. The contact areas of the optical element with the structures comprise mechanical gripping and position means including deformable members for holding an unvaried centered position to the optical element for severe temperature and mechanical operating conditions.

Optical device comprising mechanical connections transverse to the

This lighting projector, notably for surgical theaters, comprises a plurality of elongated basic elements extending radially from a central casing outwards and disposed by pairs in relative alignment and a light source for each pair of elements, disposed adjacent one of the two elements involved, with a pair of frosted zones adjacent said source, and a reflection mirror and an optical system adapted to form an image of said source on the field to be illuminated after reflecting said image on said mirror.

Lighting projector

A lighting projector, notably for surgical theatres, comprising a central case enclosing light sources, and radial basic elements of tubular configuration provided with optical means for reflecting the light rays received from said sources towards the area to be illuminated, said means comprising notably a first mirror and a second mirror, the latter being disposed on the path of the light rays and capable of returning one portion thereof towards the area to be illuminated while allowing the other fraction to pass towards said first mirror located at the outer end of the element.

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Saint-Heand, France

Andre A Masson