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US 6,285,515 B1Granted
Lens
AssigneeOlympus Optical Co., Ltd.
InventorsTatsuo Kitazawa, Tamotsu Koiwai
Life of this patent
Estimating the term…
Abstract
A lens is formed in a generally rectangular shape, and a reflection-preventing portion capable of preventing reflection of harmful rays is provided on at least one edge plane forming at least a portion of the perimeter of the lens, so that the lens is capable of suppressing deterioration of the quality of images including object images formed by a photographic lens system, in order to obtain better photographic images.
Claims19
An optical system comprising:
- a lens formed in a generally rectangular shape and having a plurality of grooves for preventing reflection of harmful rays, each groove being formed on at least one edge plane at the perimeter of the lens and extending in a direction generally orthogonal to rays passing through the lens, said plurality of grooves having different depths respectively;
- and
- a photographic aperture positioned behind the lens.
An optical system comprising:
- a lens formed in a generally rectangular shape and having a roughened surfacing for preventing reflection of harmful rays, said roughened surfacing being provided on at least one edge plane at the perimeter of the lens;
- and
- a photographic aperture positioned behind the lens.
A photographic optical system comprising:
- a photographic screen formed by a photographic aperture;
- and
- a lens in which at least a portion of the perimeter of said lens has been removed except for an effective area of the lens corresponding to the photographic screen, the removed portion forming an edge on the lens, said edge having a roughened surfacing for preventing reflection of rays from the edge of the lens formed by the removed portion.
A photographing optical system, comprising:
- at least one lens of which the outer configuration is circular, a portion of which has been removed in accordance with a photographing screen defined by a photographing aperture;
- and
- harmful rays preventing means for preventing reflection of harmful rays formed at the edge planes of said lens from entering said photographing aperture;
- wherein said harmful rays preventing means is formed only at the location of said lens from which the removed portion has been removed.
1 more element
Dependencies are inferred from the claim text.