Lens and lens unit
AssigneeHoya Corporation
InventorKenji Yamanaka
Life of this patent
Estimating the term…
Abstract
A lens includes: an optical-functioning portion that is a glass press-molded product and has both lens surfaces in an optical axis direction and a volume absorption portion allowing a shape error due to press-molding around the lens surfaces; and a flange portion made of a material different from the glass of the optical-functioning portion, fixed to the optical-functioning portion to surround the volume absorption portion, and having a position reference surface serving as a reference of a lens position. An outer diameter D in an orthogonal direction to the optical axis defined by the flange portion and a thickness t of the flange portion satisfy the following condition (1) or (2). when 2 mm≤D≤5 mm, 0.15≤t≤0.35 (1) when D>5 mm, 0.15+(D−5)×0.03≤t≤0.15+(D−5)×0.07 (2)
Claims12
A lens comprising:
- an optical-functioning portion that is a press-molded product made of glass, has lens surfaces on both sides in an optical axis direction, and has a volume absorption portion that allows a shape error due to press-molding around the lens surfaces;
- and
- a flange portion made of a material different from the glass of the optical-functioning portion, fixed to an outer circumferential surface of the optical-functioning portion to surround an outer side of the volume absorption portion, and having a position reference surface serving as a reference of a lens position,
- wherein an outer diameter D in an orthogonal direction to the optical axis defined by an outer circumferential surface of the flange portion and a thickness t in the optical axis direction of the flange portion satisfy the following condition (2):
- when D>5 mm, 0.15+(D−5)×0.03≤t≤0.15+(D−5)×0.07. (2).
Dependencies are inferred from the claim text.