Information display device
AssigneeMinolta Co., Ltd.
InventorsIchiro Kasai, Hiroaki Ueda, Yasushi Tanijiri
Life of this patent
Estimating the term…
Abstract
An information display device provided with a prism having at least two reflecting surfaces arranged in facing each other and a hologram surface formed of a reflection-type hologram. And at least one of the two reflecting surfaces is a light-beam-selective surface that selectively transmits or reflects light in accordance with its incident angle. An image light emitted from an image display means enters the prism, and is reflected between the reflecting surfaces, and then is diffractively reflected on the hologram surface, and, after being transmitted through the light-beam-selective surface, is directed to an observer's pupil.
Claims31
An information display device comprising:
- an image display member which displays images;
- and
- a prism having at least two reflecting surfaces arranged in facing each other, and a hologram surface formed of a reflection-type hologram, and at least one of the two reflecting surfaces arranged in facing each other is a light-beam-selective surface which selectively transmits or reflects light,
- wherein an image light beam that corresponds to image information and that exits from the image display member is reflected between the two reflecting surfaces arranged in facing each other, and is diffractively reflected on the hologram surface, and then, after being transmitted through the light-beam-selective surface, is directed to an observer's pupil.
An information display device comprising:
- a first image display member for displaying a first image;
- a first prism having at least two reflecting surfaces arranged in facing each other and another reflecting surface, and at least one of the two reflecting surfaces arranged in facing each other is a light-beam-selective surface which selectively transmits or reflects light;
- a second image display member for displaying a second image;
- and
- a second prism having the same construction as the first prism,
- wherein an image light beam corresponding to the information of the first image exiting from the first image display member is reflected between the two reflecting surfaces of the first prism arranged in facing each other, and is reflected on another reflecting surface of the first prism, and then, after being transmitted through the light-beam-selective surface, is directed to an observer's pupil, on the other hand, an image light beam corresponding to the information of the second image exiting from the second image display member is reflected between the two reflecting surfaces of the second prism arranged in facing each other, and is reflected on another reflecting surface, and then is, after being transmitted through the light-beam-selective surface, directed to the same observer's pupil as the light beam of the first image.
An optical element comprising:
- two reflecting surfaces arranged in facing each other, and at least one of the two reflecting surfaces is a light-beam-selective surface that selectively transmits or reflects light;
- and
- a hologram surface formed of a reflection-type hologram,
- wherein light entering the optical element is reflected on the two reflecting surfaces, and after being reflected on the hologram surface is transmitted through the light-beam-selective surface and then exits therefrom.
An optical element comprising:
- two reflecting surfaces arranged in facing each other, and at least one of the two reflecting surfaces is a light-beam-selective surface that selectively transmits or reflects light;
- and
- two hologram surface formed of a reflection-type holograms,
- wherein light entering the optical element is reflected between the two reflecting surfaces, and is reflected on the one of two hologram surfaces, and then is transmitted through the light-beam-selective surface, on the other hand, light which is different from the light to be reflected on the one of two hologram surfaces entering the optical element is reflected between the two reflecting surfaces, and is reflected on the other two hologram surfaces, after then, is transmitted through the light beam-selective surface.
Dependencies are inferred from the claim text.