Head-up display device with rotationally asymmetric curved surface
AssigneeCanon Kabushiki Kaisha
InventorsShoichi Yamazaki, Takeshi Nishimura
Life of this patent
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Abstract
A display device for displaying information is provided with an optical system for guiding the light of the display device to the eye, the optical system having, in the order in the proceeding direction of the light, an entrance face for receiving the light, a curved face for totally reflecting the light and a reflecting face concave to the eye side and adapted to reflect the light toward the eye. The reflected light is transmitted by the curved face and reaches the eye. Thus there is obtained a compact display device with satisfactorily suppressed aberrations.
Claims114
An image-forming optical system which forms an image of an object, said image-forming optical system comprising a prism member,
- wherein said prism member has a first surface and a second surface, which face each other across a medium, so that light rays entering said prism member from an object side thereof are reflected at least twice in said prism member,
- wherein both said first surface and said second surface are curved surface configurations, and at least one of the curved surface configurations is formed from a rotationally asymmetric curved surface.
An ocular optical system arranged to lead an image formed on an image plane to an observer's eyeball,
- said ocular optical system comprising a prism member,
- wherein said prism member has a first surface and a second surface, which face each other across a medium, so that light rays entering said prism member from an image side thereof are reflected at least twice in said prism member,
- wherein both said first surface and said second surface are curved surface configurations, and at least one of the curved surface configurations is formed from a rotationally asymmetric curved surface.
An optical system comprising a prism member,
- wherein said prism member has two surfaces having a reflecting action to reflect light in said prism member, and two surfaces having a transmitting action to transmit light, and
- wherein said prism member has at least one rotationally asymmetric curved surface.
An optical system comprising a prism member,
- wherein said prism member has a first surface and a second surface, which face each other across a medium, so that light rays entering said prism member are reflected at least twice in said prism member,
- wherein both said first surface and said second surface are curved surface configurations, and at least one of the curved surface configurations is formed from a rotationally asymmetric curved surface.
Dependencies are inferred from the claim text.