Structure for holding lens in lens holding member

Details Structure for holding lens in lens holding member Structure for holding lens in lens holding member

1990-10-30

1993-01-05

Ben, Loha

Optical: systems and elements

Lens

With support

359819, 359830, G02B 702

Patent

active

051776413

ABSTRACT:
Lenses, which include at least one plastic lens, are supported in a lens barrel by a lens holding structure which includes shoulder surfaces and inner circumferential surfaces of a lens barrel, at least one annular elastic member, and a retainer ring. The lenses are radially positioned in coaxial alignment with the lens barrel by the inner circumferential surfaces of the lens barrel, and axially positioned in engagement with the shoulder surfaces by the elastic member and the retainer ring. The elastic member elastically presses one of the lenses against one of the shoulder surfaces, and the retainer ring is threadedly mounted on the outer end of the lens barrel end holds the other lens against the other shoulder surface. Annular spacers may be disposed between the outer circumferential edges of the lenses and the inner circumferential surfaces of the lens barrel, for holding the lenses in coaxial alignment with the lens barrel.

REFERENCES:
patent: 3205774 (1965-09-01), Estes
patent: 3671108 (1972-06-01), Kilgus
patent: 3689134 (1972-09-01), Leitmeir et al.
patent: 4302076 (1981-11-01), Hashimoto
patent: 4668047 (1987-05-01), Okura
patent: 4737017 (1988-04-01), Nagasaka

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