Wide-range, wide-angle, rotatable compound zoom

G - Physics – 02 – B

Patent

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G02B 15/14 (2006.01)

Patent

CA 2577629

A compact zoom lens system providing a wide-range, ultra-wide angle optionally rotatable compound zoom is disclosed. In one embodiment, the optical design is comprised of an NPP kernel followed by a PP relay with four independently moving groups, two on each side of an intermediate image. The front group is stationary with respect to the image plane, as are two fold prisms. The kernel has a zoom ratio of about 2:1, and the zoom relay has a magnification ratio of about 4:1, giving a total zoom ratio of about 8.6:1. The PP relay is comprised of two independently moving positive groups. The focal lengths covered by the zoom range have a 35mm still camera equivalent of about 21mm to 180mm. The aperture of the system ranges from about f/2.8 to f/6.3, but is constant at about f/2.8 from about 3mm through 6.2mm focal length.

L'invention concerne un système d'objectif zoom compact permettant d'obtenir un zoom à composant éventuellement rotatif à ultra-grand angle et à plage étendue. Dans un mode de réalisation de l'invention, la conception optique est constituée d'un noyau NPP suivi d'un relais PP doté de quatre groupes indépendamment mobiles, deux de ces groupes étant situés de chaque côté d'une image intermédiaire. Le groupe avant est fixe par rapport au plan d'image, comme le sont les prismes doubles. Le noyau présente un rapport de zoom de 2:1 environ, et le relais de zoom présente un rapport d'agrandissement de 4:1 environ, ce qui donne un rapport de zoom total de 8,6:1 environ. Le relais PP est constitué de deux groupes positifs indépendamment mobiles. Les longueurs focales couvertes par la plage de zoom présentent un équivalent d'appareil photographique de 35mm à environ 21mm et 180mm. L'ouverture de ce système est comprise entre f/2,8 et f/6,3 environ, mais est constante entre f/2,8 et 3mm sur une longueur focale de 6,2mm.

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