US3773404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telecentric lens
Assignee: AT&T Inc
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Filing: 1972-06-30
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Granted: 1973-11-20
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Expires: 1992-06-30
Abstract
Abstract A multi-element, telecentric lens for use in a laser deflection system, or the like. The lens comprises a front plano-convex element, a center plano-concave element, and a rear plano-convex element all of specified aperture and radii of curvature. A laser beam entering the entrance pupil of the lens is brought to a focus at the image plane in such a manner that the chief ray, and hence the image cone, is normal to the image plane, regardless of the angle of the laser beam as it enters the entrance pupil of the lens.
Inventors
- 👤 D Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:00
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/22; G02B15/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
A telecentric lens comprising a front plano-convex element, a central plano-concave element, and a rear plano-convex element, said lens being constructed according to the technical data given herebelow, the foci, radii, apertures and thicknesses being given in centimeters, wherein R1, R2, R3, R4, R5, and R6 are radii of refractive surface curvatures, t1, t2, and t3 are axial thicknesses of the front, central and rear lens elements, respectively, n1, n2, and n 3 are the refractive indices at lambda 1.06 Mu of the front, central and rear lens elements, respectively, S1, S2, S3, S4 are the entrance pupil-to-front element, front element-to-central element, central element-torear element, and rear element-to-image plane distances, respectively, Focal Length 47.3 f 23.7 Object Field 12*R1 +12.960 t1 0.500 R2 infinity t2 1.00 R3 infinity t3 2.00 R4 +4.9473 S1 1.8662 R5 infinity S2 15.86R6 -8.8487 S3 9.520 S4 14.83 n1 1.50731, n2 1.50731,n3 1.50731 and where the entrance pupil, front, central, and rear lens elements, and the image field have clear apertures of 2.0, 2.5, 6.0, 10.0, and 9.4 cms, respectively.
Claim 2
Dependent Claim
175 words
A telecentric lens comprising a front plano-convex element, a central plano-concave element, and a rear plano-convex element, said lens being constructed according to the technical data given herebelow, the foci, radii, apertures and thicknesses being given in centimeters, wherein R1, R2, R3, R4, R5, and R6 are radii of refractive surface curvatures, t1, t2, and t3 are axial thicknesses of the front, central and rear lens elements, respectively, n1, n2, and n 3 are the refractive indices at lambda 1.06 Mu of the front, central and rear lens elements, respectively, S1, S2, S3, S4 are the entrance pupil-to-front element, front element-to-central element, central element-torear element, and rear element-to-image plane distances, respectively, Focal Length 47.3 f 23.7 Object Field 12*R1 +12.960 t1 0.500 R2 infinity t2 1.00 R3 infinity t3 2.00 R4 +4.9473 S1 1.8662 R5 infinity S2 15.86R6 -8.8487 S3 9.520 S4 14.83 n1 1.50731, n2 1.50731,n3 1.50731 and where the entrance pupil, front, central, and rear lens elements, and the image field have clear apertures of 2.0, 2.5, 6.0, 10.0, and 9.4 cms, respectively.
References Cited (Backward Citations)
GB411322A
Cited
US3419321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |