US3764198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Objective system consisting of a diaphragm and a single lens
Assignee: US Philips Corp
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Filing: 1972-06-01
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Granted: 1973-10-09
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Expires: 1992-06-01
Abstract
Abstract An objective system which comprises, in order of succession, a diaphragm and a single lens is described. It is shown that if such an objective satisfies several requirements, the ''''condition of radial distortion'''' applies to this objective, i.e., there is a linear relationship between an angle of incidence of a beam of radiation on the objective and the associated point in the image plane.
Inventors
- 👤 J Hunzinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:13
CPC Classifications
G; G02; G02B; G02B3/00; G01; G01S; G01S3/00; G01S3/78; G01S3/781
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
126 words
Objective system which consists of in order of succession a diaphragm and a single lens, characterized in that the surface of incidence of the lens is diverging and its surface of emergence is converging, in that the distance, measured along the optical axis, between the diaphragm and the surface of incidence is at most equal to 1/5 of the lens thickness e, also measured along the optical axis, in that the index of refraction of the lens material has a value between 1.54 and 1.73, and in that the radii of curvature r1 and r2 of the surfaces of incidence and emergence respectively are related to one another and to the lens thickness e according to the following expression: r2/r1 e/r1 0.28 + OR - 0.06
Claim 2
Dependent Claim
126 words
Objective system which consists of in order of succession a diaphragm and a single lens, characterized in that the surface of incidence of the lens is diverging and its surface of emergence is converging, in that the distance, measured along the optical axis, between the diaphragm and the surface of incidence is at most equal to 1/5 of the lens thickness e, also measured along the optical axis, in that the index of refraction of the lens material has a value between 1.54 and 1.73, and in that the radii of curvature r1 and r2 of the surfaces of incidence and emergence respectively are related to one another and to the lens thickness e according to the following expression: r2/r1 e/r1 0.28 + OR - 0.06
Claim 3
Dependent Claim
45 words
Objective system as claimed in claim 1, characterized in that the surfaces of incidence and emergence of the lens are surfaces of cylinders having parallel generatrices and a common plane of symmetry, the edges of the diaphragm being parallel to the generatrices of the lens.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |