US4968130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser beam scanning type ophthalmological instrument
Assignee: Topcon Corp
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Filing: 1988-10-26
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Granted: 1990-11-06
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Expires: 2008-10-26
Abstract
Abstract A laser beam scanning type ophthalmological instrument has a first laser beam light source for emitting a first laser beam; a second laser beam light source for emitting a second laser beam of a different wavelength from that of the first laser beam; and a light receiving element for receiving a laser beam reflected by an eye fundus, and in which the eye fundus is scanned by the first and second laser beams in order to observe the eye fundus or in order that a view field, etc. can be inspected. The laser beam scanning type ophthalmological instrument is characterized in that the first and second laser beams emitted by the first and second laser beam light sources can independently be adjusted in light quantity.
Inventors
- 👤 Masayuki Hideshima
- 👤 Shinji Wada
- 👤 Akihiko Sekine
- 👤 Takashi Yokokura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:45
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/12; A61B3/1225; A61F; A61F9/00; A61F9/007; A61F9/008; A61F9/00821; A61B17/00; A61B2017/00017; A61B2017/00199; A61B18/00; A61B18/18; A61B18/20; A61B2018/2015; A61B2018/2025; A61B2018/2065; A61B2018/207; A61F2009/00861; A61F2009/00863; A61F2009/00897
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
128 words
A laser beam scanning type ophthalmological instrument for observing and testing an eye fundus, comprising: a first laser beam light source for emitting a first laser beam; a second laser beam light source for emitting a second laser beam of a different wavelength from that of said first laser beam; a light receiving element for receiving light reflected by an eye fundus; means for scanning the eye fundus with said first and second laser beam; and means for forming an image in response to light from both said first laser beam light source and said second laser beam light source reflected from the eye fundus, said first and second laser beams emitted by said first and second laser beam light sources can independently be adjusted in light quantity.
Claim 2
Dependent Claim
128 words
A laser beam scanning type ophthalmological instrument for observing and testing an eye fundus, comprising: a first laser beam light source for emitting a first laser beam; a second laser beam light source for emitting a second laser beam of a different wavelength from that of said first laser beam; a light receiving element for receiving light reflected by an eye fundus; means for scanning the eye fundus with said first and second laser beam; and means for forming an image in response to light from both said first laser beam light source and said second laser beam light source reflected from the eye fundus, said first and second laser beams emitted by said first and second laser beam light sources can independently be adjusted in light quantity.
Claim 3
Dependent Claim
52 words
A laser beam scanning type ophthalmological instrument according to claim 1, which further includes control means for establishing light quantity of the other laser beam when a target value of output power from said light receiving element and light quantity of either one of said first and second laser beams are established.
Claim 4
Dependent Claim
65 words
A laser beam scanning type ophthalmological instrument according to claim 2, wherein said control means adjusts the light quantity of said first and second laser beam with reference to reflectance at the eye fundus with respect to a wavelength which is input as data beforehand and wavelength characteristic of said light receiving element, so that the output power of said light receiving element becomes constant.
Claim 5
Dependent Claim
193 words
A laser beam scanning type ophthalmological instrument comprising: a first laser beam light source for emitting a first laser beam; a second laser beam light source for emitting a second laser beam of a different wavelength from that of said first laser beam; a light receiving element for receiving light reflected from the eye fundus; a display for displaying an image of the eye fundus thereon when said light receiving element has received the reflected laser beam scanning means for scanning the eye fundus with said first and second laser beams, one of said first and second laser beams is used for selectively stimulating or coagulating a portion of the eye fundus control means for separately controlling light quantity of said first and second laser beams emitted by said first and second laser beam light sources and for controlling said display; and designating means for designating a desired position on the eye fundus, said control means causing said display means to display an image of the portion of the eye fundus corresponding to the designated position on said display in accordance with modulation of either one of said first and second laser beams.
Claim 6
Dependent Claim
193 words
A laser beam scanning type ophthalmological instrument comprising: a first laser beam light source for emitting a first laser beam; a second laser beam light source for emitting a second laser beam of a different wavelength from that of said first laser beam; a light receiving element for receiving light reflected from the eye fundus; a display for displaying an image of the eye fundus thereon when said light receiving element has received the reflected laser beam scanning means for scanning the eye fundus with said first and second laser beams, one of said first and second laser beams is used for selectively stimulating or coagulating a portion of the eye fundus control means for separately controlling light quantity of said first and second laser beams emitted by said first and second laser beam light sources and for controlling said display; and designating means for designating a desired position on the eye fundus, said control means causing said display means to display an image of the portion of the eye fundus corresponding to the designated position on said display in accordance with modulation of either one of said first and second laser beams.
Claim 7
Dependent Claim
22 words
A laser beam scanning type ophthalmological instrument according to claim 4, wherein one of said first and second laser beams is modulated.
Claim 8
Dependent Claim
27 words
A laser beam scanning type ophthalmological instrument according to claim 5, wherein one of said laser beams for observation has a wavelength outside of the visible spectrum.
Claim 9
Dependent Claim
52 words
A laser beam scanning type ophthalmological instrument according to any one of claims 4 through 6, which further includes preventing means for preventing reflected light of either one of said first and second laser beams from being made incident to said light receiving element while the laser beam is used for coagulation.
Claim 10
Dependent Claim
23 words
A laser beam scanning type ophthalmological instrument according to claim 7, wherein said preventing means includes a wavelength split mirror or a filter.
Claim 11
Dependent Claim
20 words
A laser beam scanning type ophthalmological instrument according to claim 7, wherein said preventing means includes an acoustic optical element.
Claim 12
Dependent Claim
18 words
A laser beam scanning type ophthalmological instrument according to claim 7, wherein said preventing means includes a shutter.
Claim 13
Dependent Claim
31 words
A laser beam scanning type ophthalmological instrument according to claim 4, wherein when said designating means designates a plurality of positions, the plurality of positions are substantially simultaneously subjected to coagulation.
References Cited (Backward Citations)
US4579430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-05 | 1994-05-07 | 1994-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-05 | 1998-05-07 | 1998-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-05 | 2002-05-07 | 2002-11-06 | $7700.00 | Window Closed / Lapsed |