Lens unit and method for manufacturing the same
AssigneeFUJIFILM Corporation
InventorsYoshiyuki Takase, Motokazu Shimizu
Life of this patent
Estimating the term…
Abstract
A holding frame of a lens unit has a frame main body of a cylindrical shape, which corresponds to the shapes of lenses. A protruding part is provided at a front end of the frame main body. The protruding part protrudes to the inside of the frame main body. The thickness of the protruding part is the same as that of a flange portion of a first lens. When the first lens is fitted into a space formed by the protruding part, a front surface of the flange portion of the first lens is flush with a front surface of the protruding part. A first light shielding film, which functions as an aperture stop, is affixed to at least one of the flange portion of the first lens and the front surface of the protruding part.
Claims6
A lens unit comprising:
- a disc-like first lens having a ring-like flange portion around a lens body portion;
- a disc-like second lens having a ring-like flange portion around a lens body portion, a diameter of the second lens being greater than a diameter of the first lens;
- a holding frame comprising a cylindrically-shaped frame main body and a protruding part provided at a front end portion of the frame main body and protruding to inside of the frame main body, the frame main body having an inner diameter corresponding to the second lens, a frame opening with a size greater than the diameter of the first lens and smaller than the diameter of the second lens being formed in a center portion of the protruding part, thickness of the protruding part in an optical axis direction and thickness of the flange portion of the first lens being the same, the holding frame using the protruding part to hold the flange portion of the second lens inserted from a rear end side of the frame main body, the holding frame holding the first and the second lenses stacked in the optical axis direction in a state that a front surface of the flange portion of the first lens is flush with a front surface of the protruding part when the first lens is fitted from a front end side of the frame main body into a space surrounded by the frame opening;
- and
- a light shielding film through which an aperture is formed, the aperture partially exposing the lens body portion of the first lens including an optical axis, the light shielding film being affixed to at least one of the front surface of the flange portion of the first lens and the front surface of the protruding part, the light shielding film being an aperture stop for the first lens.
Dependencies are inferred from the claim text.