US4217025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereoscopic microscope
Assignee: Nikon Corp
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Filing: 1978-06-30
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Granted: 1980-08-12
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Expires: 1998-06-30
Abstract
Abstract A microscope for stereoscopically observing therethrough an object from an oblique direction comprises a first convergent lens group and two second convergent lens groups. The first convergent lens group is disposed with the optic axis thereof perpendicular to the object plane to collimate the light from each point on the object plane when the focal plane thereof is coincident with the object plane. The two second convergent lens groups have equivalent optical performances and are parallel-disposed so that the principal planes thereof are coincident with each other on the exit side of the first convergent lens group and that the principal planes thereof are disposed non-parallel by forming a predetermined angle with the principal plane of the first lens group.
Inventors
- 👤 Hiroshi Takenaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:51
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/18; G02B21/20; G02B21/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
A microscope for stereoscopically observing therethrough an object from an oblique direction, comprising: a first convergent lens group disposed with the optic axis thereof perpendicular to the object plane to collimate the light from each point on the object plane when the focal plane thereof is coincident with the object plane; and two second convergent lens groups having equivalent optical performances and parallel-disposed so that the principal planes thereof are coincident with each other on the exit side of said first convergent lens group and that the principal planes thereof form a predetermined angle with the principal plane of said first lens group, said predetermined angle substantially defining the oblique direction of observation.
Claim 2
Dependent Claim
113 words
A microscope for stereoscopically observing therethrough an object from an oblique direction, comprising: a first convergent lens group disposed with the optic axis thereof perpendicular to the object plane to collimate the light from each point on the object plane when the focal plane thereof is coincident with the object plane; and two second convergent lens groups having equivalent optical performances and parallel-disposed so that the principal planes thereof are coincident with each other on the exit side of said first convergent lens group and that the principal planes thereof form a predetermined angle with the principal plane of said first lens group, said predetermined angle substantially defining the oblique direction of observation.
Claim 3
Dependent Claim
62 words
A microscope as defined in claim 1, further comprising two eyepieces disposed so that the optic axes thereof are coincident, respectively, with the optic axes of said two second convergent lens groups on the exit side thereof and that the entrance side focal points thereof are coincident with the focal points on the exit side of said two second convergent lens groups.
Claim 4
Dependent Claim
35 words
A microscope as defined in claim 2, wherein said two second convergent lens groups and said two eyepieces are movable as a unit to vary their angular position relative to said first convergent lens group.
Claim 5
Dependent Claim
35 words
A microscope as defined in claim 3, wherein the movement of said two second convergent lens groups and said two eyepieces is rotational movement substantially about the exit pupil of said first convergent lens group.
References Cited (Backward Citations)
US3912359A
Cited
US3994558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |