Anamorphic Lens
AssigneeKonica Minolta Opto, Inc.
InventorMasatoshi Hirose
Life of this patent
Estimating the term…
Abstract
Provided is a low-cost and compact super-wide-angle anamorphic lens having small number of lenses and exhibiting excellent lens performance when the lens is used for an onboard camera, capturing of an unwanted portion is minimized. The super-wide-angle anamorphic lens has an angle of view of 180° or more in the horizontal direction, and includes a first lens having a negative power, a second lens having a negative power, a third lens having a positive power, a fourth lens having a positive power in that order from an object side. One of the aforementioned third lens and fourth lens is provided with at least one non-rotationally symmetric aspherical surface.
Claims8
An anamorphic lens having an angle of view of 180° or more in a first direction perpendicular to an optical axis thereof, the lens comprising from an object side:
- a first negative lens which is made of glass and has spherical surfaces;
- a second negative lens having at least one non-rotationally symmetric aspherical surface;
- a third positive lens;
- and
- a fourth positive lens,
- wherein either the third lens or the fourth lens includes at least one non-rotationally symmetric aspherical surface.
An anamorphic lens which is used for forming an image of an object on a rectangular imaging surface of an image pickup device, and has an angle of view of 180° or more in a horizontal direction which is a direction of a long side of the rectangular imaging surface, the anamorphic lens comprising from an object side:
- a first negative lens which is made of glass and has spherical surfaces;
- a second negative lens having at least one non-rotationally symmetric aspherical surface;
- a third positive lens;
- and
- a fourth positive lens,
- wherein either the third lens or the fourth lens includes at least one non-rotationally symmetric aspherical surface.
Dependencies are inferred from the claim text.