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US 4,056,303 AGranted
Optical instrument in which eyepiece tube and objective tube are surrounded in cast resin to make a rigid core enclosed in foamed synthetic resin
AssigneeD. Swarovski & Co., Glasschleiferei
InventorsDaniel Swarovski, Kurt Schwab
Life of this patent
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Abstract
An optical instrument, for example a field-glass, in which the image-erecting system, the eyepiece tube and the objective tube are embedded in synthetic resin to form the housing of the instrument. The image-erecting system and the eyepiece and objective tubes and, if required, the hinge mechanism, are wholly or partially surrounded in cast resin to make a rigid core and this rigid core is partially or wholly enclosed in foamed synthetic resin.
Claims13
An optical instrument comprising:
- an image-erecting system;
- an eyepiece tube;
- an objective tube;
- said image-erecting system, said eyepiece tube and said objective tube being at least partially enclosed in cast resin and thereby positioned and forming a rigid core;
- and
- a foamed synthetic resin covering extending around the periphery of said rigid core and fixedly secured thereto to form the housing of the instrument.
3 more elements
Dependencies are inferred from the claim text.