Optical instrument in which eyepiece tube and objective tube are

Details Optical instrument in which eyepiece tube and objective tube are Optical instrument in which eyepiece tube and objective tube are

1976-05-18

1977-11-01

Henry, Jon W.

350 67, G02B 2318

Patent

active

040563030

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.

REFERENCES:
patent: 3531177 (1970-10-01), Akin, Jr.

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