Patent
1985-04-15
1988-07-19
Punter, William H.
350569, 350631, G02B 2302, G02B 718
Patent
active
047580771
ABSTRACT:
In a binocular employing mirrors in place of Porro prisms as an erector system, including a pair of telescopes each having a hollow body shell, a plurality of mirrors in the shell and arranged to provide a folded light path therethrough, eyepiece and objective barrels mounted on the shell and having, respectively, eyepiece and objective lenses therein and disposed at opposite ends of the light path, such mirrors being ovally-shaped and sized to conform to the respective cross sections thereat of the light bundle transmitted by the objective lenses, the shell defining an internal arcuate mirror rim-receiving surface for each of the mirrors and a portion of the rim of each mirror being adhesively secured to the receiving surface therefor by an elastic adhesive; and hinge structure including a hinge post connecting the telescopes together for adjustment of the interpupillary spacing of the eyepiece barrels, the improvement being that each mirror pair is first mounted at right angles in a hood-shaped cover, which is then delivered for elastic cementing into the binocular body shell instead of cementing the mirrors into the body shell first. The cover comprises two flat oval plates at right angles, each having three conical bosses to the apices of which the back side of a mirror is permanently cemented for collimating purposes before the cover is cemented into the body shell with an elastic adhesive which will fix the mirror edges elastically to arcuate matching surfaces of the shell wall at the same time the hood-like cover is cemented to matching surfaces of the body shell to close and complete the binocular.
REFERENCES:
patent: 471708 (1892-03-01), Rudall
patent: 1533248 (1925-04-01), Harwix
patent: 2212123 (1940-08-01), Neill et al.
patent: 3676274 (1972-07-01), Matulis
patent: 3866140 (1975-02-01), Hobart et al.
patent: 4140568 (1979-02-01), Beecher
patent: 4488790 (1984-12-01), Beecher
Trsar et al., "Production Engineering & Implementation of a Modular Military Binocular", SPIE, vol. 250, 1980, pp. 27-36.
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