Image display device with optical systems to guide light to a pupil

Patent metadata

Field	Value
Publication number	US-10495883-B2
Application number	US-201816165221-A
Country	US
Kind code	B2
Filing date	Oct 19, 2018
Priority date	Oct 2, 2014
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

An image display device with which it is possible to visually recognize an image while securing the see-through property regardless of eye movements and changes in interpupillary distance, with which it is possible to display a large-size image with high quality, and which is small, has excellent wearability, and has an excellent external appearance.

First claim

The invention claimed is:

1. An image display device comprising:
a light source optical system emitting a light;
a mirror reflecting the light emitted from the light source optical system;
a light scanning device scanning in two-dimensionally the light reflected by the mirror;
a pupil magnifying optical system magnifying a beam diameter of the light scanned by the light scanning device;
a correcting optical system correcting the light magnified by the pupil magnifying optical system; and
a deflecting optical system deflecting the light corrected by the correcting optical system to a position of an exit pupil, and the deflecting optical system transmitting a portion of external light,
wherein a cross-sectional shape of the pupil magnifying optical system is a trapezoid, and
wherein the pupil magnifying optical system is disposed in an orientation such that of two sides which are disposed parallel to each other in the trapezoid, a short side is positioned at a side which is close to the exit pupil, and a long side is positioned at a side which is distant from the exit pupil.

2. The image display device according to claim 1 ,
wherein the light scanning device is MEMS mirror.

3. The image display device according to claim 1 ,
wherein the correcting optical system correcting a shape of the light magnified by the pupil magnifying optical system.

4. The image display device according to claim 1 ,
wherein the correcting optical system correcting a aberration of the light magnified by the pupil magnifying optical system.

5. The image display device according to claim 1 ,
wherein the correcting optical system correcting a distortion of the light magnified by the pupil magnifying optical system.

6. The image display device according to claim 1 ,
wherein the light having a intermediate image on an optical pass between the correcting optical system and the deflecting optical system.

7. The image display device according to claim 1 ,
wherein the deflecting optical system is formed of a holographic mirror.

8. The image display device according to claim 1 ,
wherein the correcting optical system is provided with a plurality of lenses, and
wherein at least one lens among the plurality of lenses has a wedge shape in which a thicknesses on a side which is close to the exit pupil is thick, and a thicknesses of a side which is distant from the exit pupil is thin.

9. The image display device according to claim 1 ,
wherein the mirror is disposed to be inclined such that an optical path of the light which is incident from the light source optical system and is reflected by the mirror is positioned on a side which is separated from the exit pupil in relation to an optical path of the light which is incident on the mirror.

10. The image display device according to claim 1 ,
wherein the light source optical system includes a light source unit, an optical fiber which propagates the light from the light source unit, and a collimator lens onto which the light which is emitted from the optical fiber is incident.

11. An image display device comprising:
a light source optical system emitting a light;
a mirror reflecting the light emitted from the light source optical system;
a light scanning device scanning in two-dimensionally the light reflected by the mirror;
a pupil magnifying optical system magnifying a beam diameter of the light scanned by the light scanning device;
a correcting optical system correcting the light magnified by the pupil magnifying optical system; and
a deflecting optical system deflecting the light corrected by the correcting optical system to a position of an exit pupil, and the deflecting optical system transmitting a portion of external light,
wherein the correcting optical system correcting a shape of the light magnified by the pupil magnifying optical system.

12. The image display device according to claim 11 ,
wherein the light scanning device is MEMS mirror, and
wherein the correcting optical system correcting a distortion of the light magnified by the pupil magnifying optical system.

13. The image display device according to claim 11 ,
wherein the light having a intermediate image on an optical pass between the correcting optical system and the deflecting optical system.

14. The image display device according to claim 11 ,
wherein the correcting optical system is provided with a plurality of lenses, and
wherein at least one lens among the plurality of lenses has a wedge shape in which a thicknesses on a side which is close to the exit pupil is thick, and a thicknesses of a side which is distant from the exit pupil is thin.

15. The image display device according to claim 11 ,
wherein the mirror is disposed to be inclined such that an optical path of the light which is incident from the light source optical system and is reflected by the mirror is positioned on a side which is separated from the exit pupil in relation to an optical path of the light which is incident on the mirror.

16. The image display device according to claim 11 ,
wherein the light source optical system includes a light source unit, an optical fiber which propagates the light from the light source unit, and a collimator lens onto which the light which is emitted from the optical fiber is incident.

17. An image display device comprising:
a light source optical system emitting a light;
a mirror reflecting the light emitted from the light source optical system;
a light scanning device scanning in two-dimensionally the light reflected by the mirror;
a pupil magnifying optical system magnifying a beam diameter of the light scanned by the light scanning device;
a correcting optical system correcting the light magnified by the pupil magnifying optical system; and
a deflecting optical system deflecting the light corrected by the correcting optical system to a position of an exit pupil, and the deflecting optical system transmitting a portion of external light,
wherein the correcting optical system correcting a aberration of the light magnified by the pupil magnifying optical system.

18. The image display device according to claim 17 ,
wherein the correcting optical system is provided with a plurality of lenses, and
wherein at least one lens among the plurality of lenses has a wedge shape in which a thicknesses on a side which is close to the exit pupil is thick, and a thicknesses of a side which is distant from the exit pupil is thin.

19. The image display device according to claim 17 ,
wherein the mirror is disposed to be inclined such that an optical path of the light which is incident from the light source optical system and is reflected by the mirror is positioned on a side which is separated from the exit pupil in relation to an optical path of the light which is incident on the mirror.

20. The image display device according to claim 17 ,
wherein the light source optical system includes a light source unit, an optical fiber which propagates the light from the light source unit, and a collimator lens onto which the light which is emitted from the optical fiber is incident.

Assignees

• Seiko Epson Corp

Inventors

• Yokoyama Osamu
• Yonekubo Masatoshi
• Takeda Takashi
• Ishida Daisuke
• Ide Mitsutaka
• Sorimachi Hidemitsu

Classifications

• H04N5/64

  Constructional details of receivers, e.g. cabinets or dust covers (furniture aspects {of television cabinets} A47B81/06) · CPC title

• G02B26/101

  with both horizontal and vertical deflecting means, e.g. raster or XY scanners (colour television using laser beams scanning a display screen H04N9/3129) · CPC title

• G02B6/0005

  the light guides being of the fibre type (G02B6/0003 takes precedence) · CPC title

• G02B5/32

  Holograms used as optical elements · CPC title

• G02B26/0833

  the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD (G02B26/0825 takes precedence; micromechanical devices in general B81B) · CPC title