Abstract: Heat-absorbing phase-change materials are contained in voids provided in the substrate of a mirror to provide passive cooling. This arrangement for passive cooling of mirrors has been found especially suitable for composite mirrors used in high thermal energy laser and similar applications.

Abstract: A web transport apparatus includes a driving member which may be selectively positioned to advance a web from a reel or to rewind the web onto the reel. When positioned in the web advancing position, the driving member advances the web between the driving member and a pressure roller or other suitable pressure member to unwind the web from the reel. When moved to the web rewinding position, the driving member is coupled to and drives the reel to wind the web onto the reel. A flexible coupling provided between the driving member and a unidirectional drive motor permits the driving member to be selectively positioned by selector means to advance, rewind, and neutral positions. Through appropriate controls, the driving member may be deactivated when in the neutral position.

Abstract: A film cartridge for enclosing a photosensitive film disk within a light-tight chamber defined by opposed walls which are sealed together to encapsulate the film disk. When the cartridge is positioned in opening apparatus, force-applying members inserted through passages in one of the walls of the cartridge are moved into contact with the opposed wall. Continued movement of the members displaces the opposed wall sufficiently to rupture it and/or a seal joining the walls. A wall-separating member of the opening apparatus is inserted into the rupture and moved between the opposed walls to extend the rupture and space the walls by a distance sufficient to permit the film disk to be removed from the cartridge.

Abstract: A retractable viewfinder for a camera includes a control mechanism which provides compensation or correction for parallax as the objective lens of the camera is focused.

Abstract: An objective lens comprising a front positive meniscus element, a middle negative biconcave element and a rear positive biconvex element. Improved optical performance at a relative aperture of f/1.70 is achieved by the incorporation of an asphere on the rear surfaces of the first and second elements.