Observation apparatus and image pickup apparatus having the same
AssigneeCanon Kabushiki Kaisha
InventorShuichi Mogi
Life of this patent
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Abstract
An observation apparatus includes an observation optical system and a line of sight detection system. The observation optical system includes, in order from a display element side to an observation side, an optical path splitter configured to split an optical path, and a first lens unit having a positive refractive power. The line of sight detection system includes a second lens unit configured to image light incident on the first lens unit and split by the optical path splitter. A predetermined condition is satisfied.
Claims16
An observation apparatus comprising an observation optical system and a line of sight detection system,
- wherein the observation optical system includes, in order from a display element side to an observation side, an optical path splitter configured to split an optical path, and a first lens unit having a positive refractive power,
- wherein the line of sight detection system includes a second lens unit configured to image light incident on the first lens unit and split by the optical path splitter, and
- wherein the following inequalities are satisfied:
- 0.4<L/f1<2.0
- 11<βr<16
- βr=250 [mm]/f1
- where L is a distance on an optical axis from a rear principal point position of the first lens unit to a lens surface closest to an observation position of the second lens unit, f1 is a focal length of the first lens unit, and βr is a loupe magnification of the first lens unit.
An image pickup apparatus comprising:
- a sensor configured to receive an image formed by an optical system;
- and
- an observation apparatus used to observe an image corresponding to the image,
- wherein the observation apparatus includes an observation optical system and a line of sight detection system,
- wherein the observation optical system includes, in order from a display element side to an observation side, an optical path splitter configured to split an optical path and a first lens unit having a positive refractive power,
- wherein the line of sight detection system includes a second lens unit configured to image light incident on the first lens unit and split by the optical path splitter, and
- wherein the following inequalities are satisfied:
- 0.4<L/f1<2.0
- 11<βr<16
- βr=250 [mm]/f1
- where L is a distance on an optical axis from a rear principal point position of the first lens unit to a lens surface closest to an observation position of the second lens unit, f1 is a focal length of the first lens unit, and βr is a loupe magnification of the first lens unit.
Dependencies are inferred from the claim text.