Objective lens system
AssigneeACM Projektentwicklung GmbH
InventorIain A. Neil
Life of this patent
Estimating the term…
Abstract
A high performance fixed focal length optical imaging system for example for a cine camera is operable to receive radiation from an object space and deliver the received radiation through the optical system so as to form an image at an image surface in an image space. The imaging system has the advantage of providing high relative illumination and high contrast at elevated spatial frequencies even when using a fast aperture.
Claims23
A high performance fixed focal length optical imaging system operable to receive radiation from an object space and deliver the received radiation through the optical system so as to form an image at an image surface in an image space, said optical system comprising:
- a first positively powered lens group and a second positively powered lens group arranged in that order from object space to the image space of the optical system and aligned on a common optical axis,
- wherein at least one optical element of the first positively powered lens group and at least one optical element of the second lens group comprise an aspheric optical surface,
- wherein said first positively powered lens group comprises a first sub-lens group and a second sub-lens group wherein the first sub-lens group is stationary and the second sub-lens group is moveable axially about the optical axis for focusing the imaging system, and wherein the second lens group comprises an optical stop.
A high performance fixed focal length optical imaging system operable to receive radiation from an object space and deliver the received radiation through the optical system so as to form an image at an image surface in an image space, said optical system comprising:
- a first positively powered lens group and a second positively powered lens group arranged in that order from object space to the image space of the optical system and aligned on a common optical axis,
- wherein at least one optical element of the first positively powered lens group and at least one optical element of the second lens group comprise an aspheric optical surface, wherein said first positively powered lens group comprises a first sub-lens group and a second sub-lens group wherein the first sub-lens group is stationary and the second sub-lens group is moveable axially about the optical axis for focusing the imaging system, and wherein the full field chief ray angle in image space over the focus range is less than 15 degrees.
A high performance fixed focal length optical imaging system operable to receive radiation from an object space and deliver the received radiation through the optical system so as to form an image at an image surface in an image space, said optical system comprising:
- a first positively powered lens group and a second positively powered lens group arranged in that order from object space to the image space of the optical system and aligned on a common optical axis,
- wherein at least one optical element of the first positively powered lens group and at least one optical element of the second lens group comprise an aspheric optical surface, wherein said first positively powered lens group comprises a first sub-lens group and a second sub-lens group wherein the first sub-lens group is stationary and the second sub-lens group is moveable axially about the optical axis for focusing the imaging system, and wherein the full field average ray angle in image space over the focus range is less than 15 degrees.
Dependencies are inferred from the claim text.