Patent US4544248A successfully refreshed from Google Patents.
US4544248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ophathalmoscopic camera having a focus detecting system
Assignee: Topcon Corp
•
Filing: 1984-02-21
•
Granted: 1985-10-01
•
Expires: 2004-02-21
Abstract
Abstract An ophthalmoscopic camera comprising a photographing optical system including an objective lens adapted to be positioned opposite to a patient's eye with a working distance and an image plane on which an image of fundus of the patient's eye is formed, an illuminating optical system for projecting a beam of illuminating light to the patient's eye, a focus detecting optical system including a mark projecting system having a mark plate formed with at least one mark and located conjugate with the image plane of the photographing optical system with respect to the objective lens and an optical system for optically projecting the mark through the pupil of the patient's eye to the eye fundus. The mark projecting system includes a beam rotating device for rotating the mark projecting beam about the mark projecting optical axis.
Inventors
- 👤 Kazuo Nunokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:12
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/34; G02B7/343; A; A61; A61B; A61B3/00; A61B3/10; A61B3/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
157 words
An ophthalmoscopic camera comprising a photographing optical system including objective lens means adapted to be positioned opposite to a patient's eye with a working distance and an image plane on which an image of fundus of the patient's eye is formed, an illuminating optical system for projecting a beam of illuminating light to the patient's eye, a focus detecting optical system including mark projecting means having a mark plate formed with at least one mark and located conjugate with said image plane of the photographing optical system with respect to said objective lens means and means for optically projecting said mark through pupil of the patient's eye to the fundus of the eye, said mark projecting means including means for varying a position of at least one mark-projecting beam of light with respect to the axis of the objective lens where the beam passes the objective lens, and with respect to the pupil of the patient's eye.
Claim 2
Dependent Claim
157 words
An ophthalmoscopic camera comprising a photographing optical system including objective lens means adapted to be positioned opposite to a patient's eye with a working distance and an image plane on which an image of fundus of the patient's eye is formed, an illuminating optical system for projecting a beam of illuminating light to the patient's eye, a focus detecting optical system including mark projecting means having a mark plate formed with at least one mark and located conjugate with said image plane of the photographing optical system with respect to said objective lens means and means for optically projecting said mark through pupil of the patient's eye to the fundus of the eye, said mark projecting means including means for varying a position of at least one mark-projecting beam of light with respect to the axis of the objective lens where the beam passes the objective lens, and with respect to the pupil of the patient's eye.
Claim 3
Dependent Claim
28 words
An opthalmoscopic camera in accordance with claim 1 in which said mark projecting means includes means for producing at least two mark projecting beams emitting in different angles.
Claim 4
Dependent Claim
19 words
An ophthalmoscopic camera in accordance with claim 2 in which said beam producing means includes a split image prism.
Claim 5
Dependent Claim
28 words
An ophthalmoscopic camera in accordance with claim 2 which further includes means for rotating said mark projecting means about an optical axis of said focus detecting optical system.
Claim 6
Dependent Claim
22 words
An ophthalmoscopic camera in accordance with claim 4 in which said rotating means is means for rotatably mounting said beam producing means.
Claim 7
Dependent Claim
19 words
An ophthalmoscopic camera in accordance with claim 4 in which said rotating means is an image rotating optical element.
Claim 8
Dependent Claim
54 words
An ophthalmoscopic camera in accordance with claim 1 in which said mark projecting means has a projecting optical axis and includes means for producing a mark projecting beam emitting with an angle with respect to the projecting optical axis, means being provided for continuously rotating said mark projecting beam about said projecting optical axis.
Claim 9
Dependent Claim
55 words
An ophthalmoscopic camera in accordance with claim 7 in which said beam producing means includes an aperture offset from said projecting optical axis and adapted to be located conjugate with the pupil of the patient's eye under a focused condition, said beam rotating means includes means for rotating said aperture about the projecting optical axis.
Claim 10
Dependent Claim
20 words
An ophthalmoscopic camera in accordance with claim 7 in which said beam rotating means is an image rotating optical element.
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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |