US5237351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visual target apparatus
Assignee: Canon Inc
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Filing: 1992-02-27
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Granted: 1993-08-17
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Expires: 2012-02-27
Abstract
Abstract An apparatus for producing a figure as a visual image target visually recognizable by a patient to be examined, generating an image as a visual target from an image memory and displaying the visual target, and changing the size of the visual target in accordance with a change in diopter of the visual target.
Inventors
- 👤 Yoshimi Kohayakawa
- 👤 Motoya Takai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:25
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/028; A61B3/032; A61B3/10; A61B3/103
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
110 words
A visual target apparatus comprising: video display means for displaying a visual target visually recognizable by a subject to be examined; display control means for controlling a display of said video display means; and an optical system for projecting the visual target image onto an eye of the object the be examined, wherein when at least a part of said optical system or the visual target is changed to change the optical distance from the visual target image to the eye, said display control means changes a size of the visual target in predetermined relation with the change in the optical distance from the visual target image to the eye.
Claim 2
Dependent Claim
110 words
A visual target apparatus comprising: video display means for displaying a visual target visually recognizable by a subject to be examined; display control means for controlling a display of said video display means; and an optical system for projecting the visual target image onto an eye of the object the be examined, wherein when at least a part of said optical system or the visual target is changed to change the optical distance from the visual target image to the eye, said display control means changes a size of the visual target in predetermined relation with the change in the optical distance from the visual target image to the eye.
Claim 3
Dependent Claim
28 words
An apparatus according to claim 1, wherein said display control means reduces the size of the visual target when the visual target optically moves to a far position.
Claim 4
Dependent Claim
23 words
An apparatus according to claim 1, further comprising an image memory, wherein the visual target is an image generated by said image memory.
Claim 5
Dependent Claim
14 words
An apparatus according to claim 1, wherein the visual target is a synthesized figure.
Claim 6
Dependent Claim
14 words
An apparatus according to claim 1, wherein the visual target is an animation image.
Claim 7
Dependent Claim
17 words
An apparatus according to claim 1, wherein the visual target is a visual target for a refractometer.
Claim 8
Dependent Claim
17 words
An apparatus according to claim 1, wherein the visual target is a visual target for an optometer.
Claim 9
Dependent Claim
107 words
An ophthalmic apparatus, comprising: an eye test system, opposing an eye to be examined, for detecting eye information; video display means for displaying a visual target to be visually recognizable by the eye; and an optical system for projecting the visual target image on the eye to be examined, wherein when at least a part of said optical system or the visual target is changed to change the optical distance from the visual target image to the eye, said display control means changes a size of the visual target in predetermined relation with the change in the optical distance from the visual target image to the eye.
Claim 10
Dependent Claim
107 words
An ophthalmic apparatus, comprising: an eye test system, opposing an eye to be examined, for detecting eye information; video display means for displaying a visual target to be visually recognizable by the eye; and an optical system for projecting the visual target image on the eye to be examined, wherein when at least a part of said optical system or the visual target is changed to change the optical distance from the visual target image to the eye, said display control means changes a size of the visual target in predetermined relation with the change in the optical distance from the visual target image to the eye.
Claim 11
Dependent Claim
28 words
An apparatus according to claim 8, wherein said display control means reduces the size of the visual target when the visual target optically moves to a far position.
Claim 12
Dependent Claim
23 words
An apparatus according to claim 8, further comprising an image memory, wherein the visual target is an image generated by said image memory.
Claim 13
Dependent Claim
14 words
An apparatus according to claim 8, wherein the visual target is a synthesized figure.
Claim 14
Dependent Claim
14 words
An apparatus according to claim 8, wherein the visual target is an animation image.
Claim 15
Dependent Claim
149 words
An eye-refractometer apparatus, comprising: measuring means for projecting a measurement visual target image on a fundus of an eye to be examined and for measuring a refractive power of the eye upon reception of light reflected by the fundus of the eye; video display means for displaying a visual target to be visually recognizable by the eye to be examined; display control means for controlling a display of said video display means; and an optical system for projecting the visual target image on the eye of an object to be examined, wherein when at least a part of said optical system or the visual target is changed to change the optical distance from the visual target image to the eye, said display control means changes a size of the visual target in predetermined relation with the change in the optical distance from the visual target image to the eye.
Claim 16
Dependent Claim
149 words
An eye-refractometer apparatus, comprising: measuring means for projecting a measurement visual target image on a fundus of an eye to be examined and for measuring a refractive power of the eye upon reception of light reflected by the fundus of the eye; video display means for displaying a visual target to be visually recognizable by the eye to be examined; display control means for controlling a display of said video display means; and an optical system for projecting the visual target image on the eye of an object to be examined, wherein when at least a part of said optical system or the visual target is changed to change the optical distance from the visual target image to the eye, said display control means changes a size of the visual target in predetermined relation with the change in the optical distance from the visual target image to the eye.
Claim 17
Dependent Claim
28 words
An apparatus according to claim 13, wherein said display control means reduces the size of the visual target when the visual target optically moves to a far position.
Claim 18
Dependent Claim
23 words
An apparatus according to claim 13, further comprising an image memory, wherein the visual target is an image generated by said image memory.
Claim 19
Dependent Claim
14 words
An apparatus according to claim 13, wherein the visual target is a synthesized figure.
Claim 20
Dependent Claim
14 words
An apparatus according to claim 13, wherein the visual target is an animation image.
Claim 21
Dependent Claim
14 words
An apparatus according to claim 13, wherein the visual target is a synthesized figure.
Claim 22
Dependent Claim
14 words
An apparatus according to claim 13, wherein the visual target is an animation image.
Claim 23
Dependent Claim
23 words
An apparatus according to claim 14, further comprising an image memory, wherein the visual target is an image generated by said image memory.
Claim 24
Dependent Claim
14 words
An apparatus according to claim 14, wherein the visual target is a synthesized figure.
Claim 25
Dependent Claim
14 words
An apparatus according to claim 14, wherein the visual target is an animation image.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-16 | 1997-02-15 | 1997-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-16 | 2001-02-15 | 2001-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-16 | 2005-02-15 | 2005-08-17 | $7700.00 | Window Closed / Lapsed |