Display device

• US 7,495,836 B2
• Filed: 10/30/2007
• Issued: 02/24/2009
• Est. Priority Date: 06/13/1994
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Nishimura, Takeshi, Yamazaki, Shoichi
• Primary Examiner(s): SCHWARTZ, JORDAN MARC
• Application Number:
  US11/928,518
• Publication Number:
  US 20080094720A1
• Time in Patent Office: 483 Days
• Field of Search: 359/630, 359/631, 359/633, 359/638, 359/640
• US Class Current: 359/631
• CPC Class Codes: G02B 2027/011 comprising device for correcting geometrical aberrations, distortion
• CPC Class Codes: G02B 2027/0138 comprising image capture systems, e.g. camera
• CPC Class Codes: G02B 2027/0143 the two eyes not being equipped with identical nor symmetrical optical devices
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 2027/0187 slaved to motion of at least a part of the body of the user, e.g. head, eye
• CPC Class Codes: G02B 2027/0198 System for aligning or maintaining alignment of an image in a predetermined direction
• CPC Class Codes: G02B 27/017 Head mounted
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 5/10 with curved faces

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.

Claims

1. A display apparatus comprising:

display means for forming image information; and

optical means for guiding light of said display means to an eye, said optical means including a concave mirror decentered with respect to an optical axis of the eye and having different optical powers according to an azimuth angle and another surface decentered with respect to the optical axis of the eye and having different optical powers according to an azimuth angle,

wherein when a paraxial curvature radius of a generatrix section of said concave mirror and a paraxial curvature radius of a meridian section of said concave mirror are respectively defined by r_y and r_x, the relationship of |r_x|<

|r_y| is satisfied.

2. An apparatus according to claim 1, wherein a surface of said concave mirror and said another surface have optical powers having mutually different positive or negative power on a section of a meridian of each said surface.

3. An apparatus according to claim 2, wherein said optical means comprises an eyepiece optical system for directly magnifying the image information from said display means.

4. An apparatus according to claim 1, further comprising:

illumination means for illuminating the eye; and

light-receiving means for receiving the light reflected from the eye to detect the visual line thereof.