US3933408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microscope-illuminating system
Assignee: Individual
•
Filing: 1974-03-06
•
Granted: 1976-01-20
•
Expires: 1994-03-06
Abstract
Abstract Light from a fluorescent lamp successively passes a field stop, a condensing lens assembly close to that stop, an aperture stop and a microscope objective. The condensing lens assembly projects an aerial image of the lamp in the vicinity of the aperture stop and focuses the field stop at infinity; the microscope objective focuses an image of the field stop on its object plane. A dispersive lens may be interposed between the fluorescent lamp and the field stop to enable the use of condensing lens assemblies of short focal length.
Inventors
- 👤 Guido Georg Reinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:08
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06; G02B21/08; G02B21/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
94 words
An illuminating system for a microscope provided with an objective, comprising: a fluorescent lamp remote from said objective; a field-control diaphragm proximal to said lamp and an aperture-control diaphragm remote from said lamp disposed along the objective axis between said objective and said lamp; and collective lens means between said diaphragms producing an aerial image of said lamp immediately ahead of said aperture-control diaphragm while focusing said field-control diaphragm at infinity whereby an image of said field-control diaphragm is formed at a focal plane of said objective illuminated by rays from said aerial image.
Claim 2
Dependent Claim
94 words
An illuminating system for a microscope provided with an objective, comprising: a fluorescent lamp remote from said objective; a field-control diaphragm proximal to said lamp and an aperture-control diaphragm remote from said lamp disposed along the objective axis between said objective and said lamp; and collective lens means between said diaphragms producing an aerial image of said lamp immediately ahead of said aperture-control diaphragm while focusing said field-control diaphragm at infinity whereby an image of said field-control diaphragm is formed at a focal plane of said objective illuminated by rays from said aerial image.
Claim 3
Dependent Claim
27 words
A system as defined in claim 1 wherein said collective lens means is disposed relatively close to said field-control diaphragm and relatively remote from said aperture-control diaphragm.
Claim 4
Dependent Claim
19 words
A system as defined in claim 2, further comprising dispersive lens means between said lamp and said field-control diaphragm.
Claim 5
Dependent Claim
20 words
A system as defined in claim 1 wherein said lamp is provided with control means for varying its luminous intensity.
References Cited (Backward Citations)
US2730923A
Cited
US2738708A
Cited
US3137761A
Cited
US3421808A
Cited
US3414345A
Cited
US3679287A
Cited
US3799645A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |