Fixed focal length objective
OwnerStefan Rothinventor
Life of this patent
Estimating the term…
Abstract
The invention relates to a fixed focal length objective having a stationary lens group forward in the direction of light (VG), a stationary diaphragm (BL) with an adjustable aperture, a stationary rear lens group (HG) and a focussing group (MG) displaceable relative to the diaphragm along the optical axis of the objective for imaging objects at different distances onto a stationary image plane (IM), in which lens the focussing group (MG) consists of at least one lens element and a diffractive optical element (DOE) integrated into the focussing group (MG).
Claims24
A fixed focal length lens comprising, in the light direction, a fixed front lens group (VG), a fixed stop (BL) with an adjustable aperture, a fixed back lens group (HG), and a focusing group (MG) positioned between the fixed front lens group (VG) and the fixed back lens group (HG), wherein said focusing group (MG) can be displaced relative to the stop along the optical axis of the lens for the purpose of imaging differently distant objects on a fixed image plane (IM), wherein
- the focusing group (MG) consists of at least a lens element and a diffractive optical element (DOE) integrated into the focusing group (MG);
- and
- the focusing group (MG) consists of a maximum of two lens elements and has a positive optical power f′MG overall;
- wherein
- the ratio V of the volume of the focusing group (MG) to the image circle diameter (Bd) in an imaging plane (IM), raised to the third power, is less than 0.1 (V/Bd3<0.1).
A fixed focal length lens comprising, in the light direction, a fixed front lens group (VG), a fixed stop (BL) with an adjustable aperture, a fixed back lens group (HG), and a focusing group (MG) positioned between the fixed front lens group (VG) and the fixed back lens group (HG), wherein said focusing group (MG) can be displaced relative to the stop along the optical axis of the lens for the purpose of imaging differently distant objects on a fixed image plane (IM), wherein
- the focusing group (MG) consists of at least a lens element and a diffractive optical element (DOE) integrated into the focusing group (MG);
- and
- the focusing group (MG) consists of a maximum of two lens elements and has a positive optical power f′MG overall;
- wherein
- the ratio of the optical overall length (SO′) of the lens to the image circle diameter (Bd) in an imaging plane (IM) is less than or equal to 3.0 (SO′/Bd<=3.0).
Dependencies are inferred from the claim text.