Photographic lens device

Details Photographic lens device Photographic lens device

1989-05-22

1989-12-12

Arnold, Bruce Y.

350417, 350475, G02B 702, G02B 916

Patent

active

048863424

ABSTRACT:
A photographing lens device wherein the optical axes of lenses can be aligned with a high degree of accuracy with a simple structure and at least a lens made of a plastic material can be secured to a lens barrel without causing a torsion thereof. The photographing lens device comprises first, second and third lenses arranged in this order from the object side. The second and third lenses have mutually contacting flat faces formed thereon outside effective light path regions therein, and the third lens is secured to the second lens at the flat faces of them by a bonding agent. The optical axis of the second and third lenses are aligned with each other by slipping the lenses along the flat faces thereof before adhesion. The second lens further has a contacting face formed outwardly of the flat face thereof and is pressed at the contacting face thereof against a face of a lens barrel while the first lens is pressed against the second lens by a pressing member coupled to the lens barrel.

REFERENCES:
patent: 2373815 (1945-04-01), Riccio
patent: 3402003 (1968-09-01), McFarland
patent: 3784287 (1974-01-01), Grey
patent: 4258982 (1981-03-01), Skinner et al.

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