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US 2003/0169516 A1Published application
Optical system, and optical apparatus
AssigneeOlympus Corporation
InventorKentaro Sekiyama
Life of this patent
Estimating the term…
Abstract
The invention relates to an optical system that can be operated with low power consumptions, reduced noises and fast responses, is simplified in mechanical structure and of reduced outer diameter and compact size, and is capable of focusing and zooming. This optical system comprises a rotationally symmetric lens group and an optical element having variable optical properties, whereby focusing or zooming can be performed. Focusing or zooming can be performed by use of a plurality of optical elements having variable optical properties, wherein at least one of the optical elements is configured to a free-form surface shape.
Claims30
An optical system, comprising:
- a rotationally symmetric lens, and
- an optical element having variable optical properties, wherein said optical element having variable optical properties has a focusing or zooming function.
An optical system, comprising:
- a plurality of optical elements having variable optical properties, wherein each of said optical elements having variable optical properties has a focusing or zooming function.
An optical system, comprising:
- at least one optical element having variable optical properties, wherein said optical element having variable optical properties turns to a free-form surface shape in a given state upon focusing or zooming.
An optical system, comprising:
- an optical element having variable optical properties, wherein said optical system is constructed such that the angle of incidence of an axial chief ray on said optical element having variable optical properties is in the range of 15° to 30° inclusive.
An optical system, comprising:
- a lens group having negative power and a lens group having positive power, and
- an optical element having variable optical properties, wherein said optical system is constructed such that an axial incident light ray from an object on said optical system and an axial emergent light ray from an exit pupil are substantially parallel with each other in a given state.
An optical system, comprising:
- a lens group having negative power and a lens group having positive power, and
- an optical element having variable optical properties, wherein said lens group having negative power and said lens group having positive power form together a retrofocus type lens system, and said optical element having variable optical properties is located in the rear of said lens group having negative power and said lens group having positive power and has a zooming or focusing function.
An optical system, comprising:
- an optical element having variable optical properties, wherein said optical element having variable optical properties has two states where a free-form surface coefficient C4 has opposite signs in a given state.
An optical system, comprising:
- an optical element having variable optical properties, wherein said optical element having variable optical properties has two states where a free-form surface coefficient C6 has opposite signs in a given state.
An optical system, comprising:
- an optical element having variable optical properties, wherein said optical element having variable optical properties satisfies the following condition (103) in a given state:.
- 0.05<|FTELE/FWIDE|<20 (103)
- where FWIDE is a focal length of said optical element having variable optical properties upon zooming to the wide-angle side of said optical system, and FTELE is a focal length of said optical element having variable optical properties upon zooming to the telephoto side of said optical system.
An optical system, comprising:
- an optical element having variable optical properties, wherein said optical system satisfies the following condition (101) in a given state:
- 0≦|PDFM×FTOT|<10 (101)
- where PDFM is a power of said optical element having variable optical properties, and FTOT is a focal length of a lens group between the first lens surface and just before said optical element having variable optical properties in said optical system.
An optical system, comprising:
- two optical elements having variable optical properties, wherein said optical system satisfies the following condition (105) in a given state:
- 0.1<D1/FTOT<5 (105)
- where D1 is a length as calculated on an air basis between said two optical elements having variable optical properties, and FTOT is a focal length of a lens group between the first lens surface and just before said optical element having variable optical properties in said optical system.
An optical system, comprising:
- two optical elements having variable optical properties, wherein said optical system satisfies the following condition (107) in a given state:
- 0.1<D2/FTOT<5 (107)
- where D2 is a length as calculated on an air basis from the second optical element having variable optical properties to an intermediate image plane, and FTOT is a focal length of a lens group between the first lens surface and just before said optical element having variable optical properties in said optical system.
An optical system, comprising:
- an optical element having variable optical properties, wherein said optical system satisfies the following condition (109) in a given state:
- 0.5<CJ/FTOT<10 (109)
- where CJ is a distance from the first lens surface in an image pickup system lens group to an intermediate image plane, and FTOT is a focal length of a lens group between the first lens surface and just before said optical element having variable optical properties in said optical system.
An optical system, comprising:
- an optical element having variable optical properties, wherein said optical system satisfies the following condition (111) in a given state:
- 10°<2ω<67° (111)
- wherein 2ω is a maximum angle of view of a light ray incident on said optical system.
An optical system, comprising:
- an optical element having variable optical properties, wherein said optical element having variable optical properties satisfies the following condition (117) in a given state:
- 0.01<C6/C4<10 (117)
- where C4 and C6 are each a free-form surface coefficient.
An optical system, comprising:
- an optical element having variable optical properties, wherein said optical element having variable optical properties satisfies the following condition (119) in a given state:
- 0.01<C10/C8<10 (119)
- where C8 and C10 are each a free-form surface coefficient.
An optical system, comprising:
- an optical element having variable optical properties, wherein said optical element having variable optical properties satisfies the following condition (121) in a given state:
- 0.01<C13/C11<100 (121)
- where C11 and C13 are each a free-form surface coefficient.
An optical system, comprising:
- an optical element having variable optical properties, wherein said optical element having variable optical properties satisfies the following condition (123) in a given state:
- 0.01<C11/C151<10 (123)
- where C11 and C15 are each a free-form surface coefficient.
An optical system, comprising:
- an optical element having variable optical properties, and
- an image pickup system lens group, wherein said optical system satisfies the following condition (113) in a given state:
- 0.1<|FN|/FTOT<10 (113)
- wherein FN is a focal length of a lens group having negative power and included in said image pickup system lens group, and FTOT is a focal length of a lens group between the first lens surface and just before said optical element having variable optical properties in said optical system.
1 more element
An optical system, comprising:
- an optical element having variable optical properties, and
- an image pickup system lens group, wherein said optical system satisfies the following condition (115) in a given state:
- 0.1<|FP|/FTOT<10 (115)
- wherein FP is a focal length of a lens group having positive power and included in said image pickup system lens group, and FTOT is a focal length of a lens group between the first lens surface and just before said optical element having variable optical properties in said optical system.
1 more element
An optical system, comprising:
- two optical elements having variable optical properties, wherein said optical system is constructed such that a position where a chief ray at a given image height for said optical system intersects an optical axis of said optical system is located between said two optical elements having variable optical properties.
An optical system, comprising:
- at least one optical element having variable optical properties, wherein said at least one optical element having variable optical properties is transformed for diopter control.
An optical system, comprising:
- an optical element having variable optical properties, wherein said optical element having variable optical properties has such a property as to have an increased converging action at a near point of object distance and a decreased converging action at a far point object distance.
An optical system, comprising:
- two optical elements having variable optical properties, wherein said two optical elements having variable optical properties have free-form surface coefficients C4 with opposite signs in a given state.
An optical system, comprising:
- two optical elements having variable optical properties, wherein said two optical elements having variable optical properties have free-form surface coefficients C6 with opposite signs in a given state.
Dependencies are inferred from the claim text.