US5689736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image observation apparatus
Assignee: Canon Inc
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Filing: 1996-02-26
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Granted: 1997-11-18
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Expires: 2016-02-26
Abstract
Abstract The present invention relates to an image observation apparatus which comprises an optical system having a plurality of reflecting surfaces and a positive refracting power to guide light from an image to an observer and a visual axis detection system including a light source for illuminating an anterior ocular segment of the observer to detect a visual axis of the observer, a light-receiving device for receiving an image of the anterior ocular segment which is formed by light reflected by the anterior ocular segment and having passed through a portion of the optical system, and a device for correcting an aberration of the image of the anterior ocular segment which occurs when the image passes through at least a portion of the optical system.
Inventors
- 👤 Atsushi Okuyama
- 👤 Shoichi Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:24
CPC Classifications
G; G03; G03B; G03B13/00; G03B13/02; G03B13/06
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
127 words
An image observation apparatus comprising: an optical system having a plurality of reflecting surfaces and a positive refracting power to guide light from an image to an observer; and a visual axis detection system comprising a light source for illuminating an anterior ocular segment of the observer to detect a visual axis of the observer, light-receiving means for receiving an image of the anterior ocular segment which is formed by light reflected by the anterior ocular segment and having passed through a tilted curved surface constituting said optical system, and correcting means for correcting an aberration of the image of the anterior ocular segment which occurs when the image passes through the tilted curved surface constituting said optical system, said correcting means comprising a tilted curved surface.
Claim 2
Dependent Claim
127 words
An image observation apparatus comprising: an optical system having a plurality of reflecting surfaces and a positive refracting power to guide light from an image to an observer; and a visual axis detection system comprising a light source for illuminating an anterior ocular segment of the observer to detect a visual axis of the observer, light-receiving means for receiving an image of the anterior ocular segment which is formed by light reflected by the anterior ocular segment and having passed through a tilted curved surface constituting said optical system, and correcting means for correcting an aberration of the image of the anterior ocular segment which occurs when the image passes through the tilted curved surface constituting said optical system, said correcting means comprising a tilted curved surface.
Claim 3
Dependent Claim
74 words
An apparatus according to claim 1, wherein said optical system has a first surface opposing the observer, a second surface constituted by a reflecting concave surface, and a third surface on which the light from the image is incident, and the light from the image which is incident on the third surface is totally reflected by the first surface, focused/reflected by the second surface toward the first surface, and emerges from the first surface.
Claim 4
Dependent Claim
24 words
An apparatus according to claim 2, wherein said optical system is a prism member on which the first, second, and third surfaces are formed.
Claim 5
Dependent Claim
28 words
An apparatus according to claim 2, wherein an area which transmits the light reflected by the anterior ocular segment is formed on a portion of the second surface.
Claim 6
Dependent Claim
28 words
An apparatus according to claim 4, wherein said visual axis detection system has a stop near the area which transmits the light reflected by the anterior ocular segment.
Claim 7
Dependent Claim
34 words
An apparatus according to claim 5, wherein said visual axis detection system has a stop at the same position as that of the area which transmits the light reflected by the anterior ocular segment.
Claim 8
Dependent Claim
27 words
An apparatus according to claim 4, wherein the area which transmits the light reflected by the anterior ocular segment has a diameter of less than 2 mm.
Claim 9
Dependent Claim
31 words
An apparatus according to claim 2, further comprising a plurality of areas which transmit the light reflected by the anterior ocular segment and are formed on portions of the second surface.
Claim 10
Dependent Claim
50 words
An apparatus according to claim 4, wherein said light source is an infrared source, and a dichroic film for reflecting visible light and transmitting light is formed on the area which is formed on a portion of the second surface and transmits the light reflected by the anterior ocular segment.
Claim 11
Dependent Claim
22 words
An apparatus according to claim 2, wherein illumination light from said light source directly illuminates the anterior ocular segment of the observer.
Claim 12
Dependent Claim
49 words
An apparatus according to claim 2, further comprising an area which transmits the illumination light from said light source and is formed on the second surface, and wherein the illumination light from said light source illuminates the anterior ocular segment of the observer via the first and second surfaces.
Claim 13
Dependent Claim
14 words
An apparatus according to claim 1, further comprising display means for forming the image.
Claim 14
Dependent Claim
45 words
An apparatus according to claim 1, at least one of said plurality of reflecting surfaces being a curved surface only symmetrical with respect to a plane containing a ray emerging from a central portion of the image and passing a central portion of a pupil.
Claim 15
Dependent Claim
12 words
An apparatus according to claim 1, wherein the aberration is an astigmatism.
Claim 16
Dependent Claim
15 words
An apparatus according to claim 1, wherein said correcting means is a wedge-shaped optical member.
Claim 17
Dependent Claim
14 words
An apparatus according to claim 15, wherein said optical member has a refracting power.
Claim 18
Dependent Claim
28 words
An apparatus according to claim 1, further comprising a stop for said visual axis detection system, said stop being provided between said optical system and said correcting means.
Claim 19
Dependent Claim
17 words
An apparatus according to claim 1, said stop comprising an opening portion formed in said optical system.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 2000-11-17 | 2001-05-19 | 2001-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-17 | 2005-05-19 | 2005-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-17 | 2009-05-19 | 2009-11-18 | $7700.00 | Window Closed / Lapsed |