Patent US4518231A successfully refreshed from Google Patents.
US4518231A
Expired / Lapsed
US
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Stereomicroscope
Assignee: Carl Zeiss AG
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Filing: 1983-05-02
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Granted: 1985-05-21
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Expires: 2003-05-02
Abstract
Abstract A stereomicroscope in which the axes of the two stereo channels are guided in parallel behind the objective assembly. Two different embodiments of the objective assembly are disclosed. One embodiment contains a common main objective for both individual stereoscopic pencils as well as a pair of wedge prisms of dispersive action to correct for the chromatic aberration in the direction of the stereo base which is produced as a result of the eccentric passage of the individual pencils through the objective. The second embodiment comprises a pair of individual objectives (Greenough type) which are inclined to each other, as well as a pair of a chromatic wedge prisms in order to adapt the angle of inclination of the objectives to the parallel passage of the beam in the tube.
Inventors
- 👤 Franz Muchel
- 👤 Fritz Strahle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:34
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/18; G02B21/20; G02B21/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A stereomicroscope having two parallel conducted observation channels behind an objective assembly, said objective assembly comprising (a) two individual objectives having respective optical axes which are inclined with respect to each other and with respect to said parallel channels, (b) two prism assemblies to compensate for the inclination of said optical axes of said objectives with respect to said parallel channels, and (c) a common housing containing said two objectives and said two prism assemblies, said common housing forming a replaceable and interchangeable part of said stereomicroscope, (d) each of said two prism assemblies including at least two cemented refractive wedge prism elements, one of said prism assemblies being mounted in operative relation to each of said objectives.
Claim 2
Dependent Claim
118 words
A stereomicroscope having two parallel conducted observation channels behind an objective assembly, said objective assembly comprising (a) two individual objectives having respective optical axes which are inclined with respect to each other and with respect to said parallel channels, (b) two prism assemblies to compensate for the inclination of said optical axes of said objectives with respect to said parallel channels, and (c) a common housing containing said two objectives and said two prism assemblies, said common housing forming a replaceable and interchangeable part of said stereomicroscope, (d) each of said two prism assemblies including at least two cemented refractive wedge prism elements, one of said prism assemblies being mounted in operative relation to each of said objectives.
Claim 3
Dependent Claim
17 words
The invention defined in claim 1, wherein said prism elements are made of glass having anomalous dispersion.
Claim 4
Dependent Claim
33 words
The invention defined in claim 1, further comprising (e) an additional housing interchangeable with said common housing, said additional housing containing (i) a single common main objective for both of said observation channels.
Claim 5
Dependent Claim
39 words
The invention defined in claim 3, wherein said additional housing also contains (ii) a pair of direct vision dispersive wedge prisms, one for each observation channel, to compensate for transverse chromatic aberration in the direction of a stereo base.
Claim 6
Dependent Claim
23 words
The invention defined in claim 3, wherein said common main objective consists essentially of two single collecting lenses and a collecting cemented doublet.
Claim 7
Dependent Claim
98 words
The invention defined in claim 5, wherein said lenses have substantially the characteristics indicated in the following table; ______________________________________
Index of
Abbe
Thick- Air Refraction
Number
Lens Radius ness Spacing
n.sub.d v.sub.d
______________________________________
r.sub.1 = -30.5
L.sub.1 d.sub.1 = 15.0 1.61772 49.77
r.sub.11 = -38.1
a.sub.1 = 0.2
r.sub.2 = 538.6
L.sub.2 d.sub.2 = 6.7 1.58913 61.27
r.sub.12 = -109.0
a.sub.2 = 0.2
r.sub.3 = 124.1
L.sub.3 d.sub.3 = 9.7 1.58599 61.04
r.sub.13 = -84.7
L.sub.4 d.sub.4 = 4.0 1.76180 26.95
r.sub.4 = plano
Focal length f = 100 mm.
Object-side back focus s' = 108.7 mm.
______________________________________
References Cited (Backward Citations)
US1790926A
Cited
US1501059A
Cited
FR701940A
Cited
US2406526A
Cited
US2639653A
Cited
GB907679A
Cited
US3353892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |