Plastic lens
AssigneeFujinon Corporation
InventorKenichi SAKAMOTO
Life of this patent
Estimating the term…
Abstract
A plastic lens comprises a lens portion and a flange portion which are cast as an integral piece by injection molding using separate molds. A positioning reference surface is formed as an integral part of the lens portion between the lens portion and the flange portion by a casting mold for forming the lens portion. When the plastic lens is installed in a lens barrel and adjusted in position, a fixture holds the plastic lens at the positioning reference surface.
Claims3
A plastic lens element comprising a lens portion which is formed by a lens casting split mold and a flange portion surrounding the lens portion which is formed as an integral part of the lens portion by a flange casting split mold provided separately from said lens casting split mold, said plastic lens element comprising:
- a first lens surface forming an entrance aperture of said lens portion;
- a second lens surface forming an effective exit aperture of said lens portion;
- and
- a positioning surface serving as a reference surface for adjusting an optical axis of said plastic lens element with respect to a central axis of a lens barrel in which said plastic lens element is installed;
- wherein said positioning surface is formed as an integral part of said lens portion formed between said lens portion and said flange portion by said lens casting split mold.
Dependencies are inferred from the claim text.