Back to results
US 12,601,863 B2Granted
Optical system and optical apparatus having the same
AssigneeCanon Kabushiki Kaisha
InventorTsubasa Nakamura
Life of this patent
Estimating the term…
Abstract
An optical system includes a diffusion element configured to diffuse an incident light beam at a diffusion point and to emit diffused light, and an imaging element configured to form an image of the diffusion point. Peak intensities in a diffusion angle distribution characteristic of the diffused light are discrete. A predetermined condition is satisfied.
Claims17
An optical system comprising:
- a diffusion element configured to diffuse an incident light beam at a diffusion point and to emit diffused light, and
- an imaging element configured to form an image of the diffusion point,
- wherein peak intensities in a diffusion angle distribution characteristic of the diffused light are discrete, and
- wherein the following inequalities are satisfied:
- 1.0<(θp+θN)/θd<300.0
- where θd is a maximum value of intervals between the peak intensities in the diffusion angle distribution characteristic, θp is an angle range of an entrance pupil of the imaging element with respect to the diffusion point, and θN is an effective spread angle of the diffused light;
- and
- 0.05<θN min<20.50
- where θN min is a minimum value of the effective spread angle.
6 more elements
An optical system comprising:
- a diffusion element configured to diffuse an incident light beam at a diffusion point and to emit diffused light, and
- an imaging element configured to form an image of the diffusion point,
- wherein peak intensities in a diffusion angle distribution characteristic of the diffused light are discrete, and
- wherein the following inequalities are satisfied:
- 1.0<(θp+θN)/θd<300.0
- where θd is a maximum value of intervals between the peak intensities in the diffusion angle distribution characteristic, θp is an angle range of an entrance pupil of the imaging element with respect to the diffusion point, and θN is an effective spread angle of the diffused light;
- 0.05<θN min<20.50
- where θN min is a minimum value of the effective spread angle;
- and
- θp<θw−2×θax
- where θax is an angle formed by a principal ray of the incident light beam and a straight line connecting the diffusion point and a center of the entrance pupil of the imaging element, and θw is an effective diffusion angle at the diffusion point.
8 more elements
An optical system comprising:
- a diffusion element configured to diffuse an incident light beam at a diffusion point and to emit diffused light, wherein the incident light beam includes infrared light with a wavelength of 700 nm or longer, and
- an imaging element configured to form an image of the diffusion point,
- wherein peak intensities in a diffusion angle distribution characteristic of the diffused light are discrete, and
- wherein the following inequalities are satisfied:
- 1.0<(θp+θN)/θd<300.0
- where θd is a maximum value of intervals between the peak intensities in the diffusion angle distribution characteristic, θp is an angle range of an entrance pupil of the imaging element with respect to the diffusion point, and θN is an effective spread angle of the diffused light;
- and
- 0.05<θN min<20.50
- where θN min is a minimum value of the effective spread angle.
6 more elements
Dependencies are inferred from the claim text.