US3749481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical slit adjustment device for a slit lamp
Assignee: American Optical Corp
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Filing: 1971-04-20
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Granted: 1973-07-31
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Expires: 1991-04-20
Abstract
Abstract A slit lamp illumination system in which the reflex mirror rotates about the axis of mirror incidence and about a pivot axis perpendicular thereto for combined horizontal and vertical sweep of the illumination beam across the eye interior. The objective lens remains parfocalized while the pivot action takes place. The pivot is by cam action between the mirror support and a tube assembly in which the mirror and objective are mounted.
Inventors
- 👤 I Bosack
- 👤 M Sussman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:31
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06; A; A61; A61B; A61B3/00; A61B3/10; A61B3/13; A61B3/135
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
173 words
A slit lamp apparatus including: an illumination system disposed along an illumination axis and including a light source, a condenser lens, an objective lens, and a mirror to direct light into the eye of a patient, an observation system to view the interior of the eye thus illuminated, said slit lamp apparatus characterized by the following improvement: said mirror being mounted for rotation about the mirrorincidence axis and mounted for pivoting about a pivot axis perpendicular to said mirror-incidence axis for combined horizontal and vertical swing adjustability of the direction of the axis of mirror-reflection, said objective lens being mounted in a lens housing, said mirror being pivotally mounted on said lens housing at said pivot aXis, movably disposed, said tube assembly being coaxial with and rotatable about said mirror-incidence axis, adjustment means to move said lens housing axially relative to said tube assembly, and pivot means responsive to the axial movement of said lens housing relative to said tube assembly to vary the angular orientation of said mirror about said pivot axis.
Claim 2
Dependent Claim
173 words
A slit lamp apparatus including: an illumination system disposed along an illumination axis and including a light source, a condenser lens, an objective lens, and a mirror to direct light into the eye of a patient, an observation system to view the interior of the eye thus illuminated, said slit lamp apparatus characterized by the following improvement: said mirror being mounted for rotation about the mirrorincidence axis and mounted for pivoting about a pivot axis perpendicular to said mirror-incidence axis for combined horizontal and vertical swing adjustability of the direction of the axis of mirror-reflection, said objective lens being mounted in a lens housing, said mirror being pivotally mounted on said lens housing at said pivot aXis, movably disposed, said tube assembly being coaxial with and rotatable about said mirror-incidence axis, adjustment means to move said lens housing axially relative to said tube assembly, and pivot means responsive to the axial movement of said lens housing relative to said tube assembly to vary the angular orientation of said mirror about said pivot axis.
Claim 3
Dependent Claim
78 words
The improvement defined in claim 1 wherein said pivot means include: a cam slot defined by said tube assembly and extending in a direction oblique to said mirror-incidence axis, a cam follower operatively connected between said mirror and said cam slot whereby the axial movement of said lens housing and mirror relative to said tube assembly causes said cam follower to displace laterally relative to said mirror-incidence axis and causes said mirror to swing about said pivot axis.
Claim 4
Dependent Claim
53 words
The improvement defined in claim 1 further including: a lens retaining ring resiliently mounted to and supporting said objective lens within said lens housing, means operatively disposed between said mirror and said retaining ring to effect the displacement of said retaining ring relative to said pivot axis when said lens housing is moved.
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |