DISPLAY OPTICAL SYSTEM AND IMAGE DISPLAY APPARATUS INCLUDING THE SAME

• US 20070279744A1
• Filed: 05/30/2007
• Published: 12/06/2007
• Est. Priority Date: 06/06/2006
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Fujimoto, Makoto
• Granted Patent: US 7,894,138 B2
• Time in Patent Office: Days
• US Class Current: 359/557
• CPC Class Codes: G02B 2027/011 comprising device for correcting geometrical aberrations, distortion
• CPC Class Codes: G02B 2027/012 comprising devices for attenuating parasitic image effects
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00

Abstract

At least one exemplary embodiment is directed to a display optical system which includes a first optical system configured to form a magnified image of an image displayed on an image display element, the first optical system including an optical member, a second optical system configured to magnify and guide light of the magnified image from the first optical system to one of an observer or a projection surface, the second optical system including a decentered reflecting surface, and an adjusting mechanism configured to displace the optical member of the first optical system in such a way as to have a component in a direction perpendicular to an optical axis of the first optical system.

Claims

1. A display optical system comprising:

a first optical system configured to form a magnified image of an image displayed on an image display element, the first optical system including an optical member;

a second optical system configured to magnify and guide light of the magnified image from the first optical system to one of an observer or a projection surface, the second optical system including a decentered reflecting surface; and

an adjusting mechanism configured to displace the optical member of the first optical system in such a way as to have a component in a direction perpendicular to an optical axis of the first optical system.

2. The display optical system according to claim 1, wherein the optical member has a rotationally asymmetric surface.

3. The display optical system according to claim 1, wherein the adjusting mechanism is configured to shift the optical member in a direction perpendicular to the optical axis.

4. The display optical system according to claim 1, wherein the adjusting mechanism is configured to tilt the optical member around a rotational axis perpendicular to the optical axis.

5. The display optical system according to claim 1, wherein the display optical system includes a prism body having a first surface, a second surface, and a third surface, and

wherein light having entered the prism body via the first surface sequentially reflects on the second surface and the third surface, and the light further sequentially reflects on the second surface and the first surface and exits from the second surface.

6. An image display apparatus comprising:

the display optical system according to claim 1; and

an image display element configured to display an image,

wherein the display optical system is configured to allow the image displayed on the image display element to be observed.