US3873188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aligning means for incremental lenses
Assignee: 3M Co
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Filing: 1973-03-29
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Granted: 1975-03-25
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Expires: 1993-03-29
Abstract
Abstract Optical lenses formed with incremental surfaces of the Fresneltype to provide for the direction of light can be used in pairs to provide lenses of specific power. It is necessary to align the optic axis of these lens pairs however and this may be accomplished by forming on one lens at positions spaced 90* about the circumference of the lens a V-shaped groove and forming on the other of the lenses a mating rib in respective positions such that the opposed rib and groove when mated at all four positions will align the axis.
Inventors
- 👤 Robert B Baeker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:25
CPC Classifications
G; G01; G01M; G01M11/00; G01M11/02; G01M11/0221; G02; G02B; G02B3/00; G02B3/02; G02B3/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
A lens comprising a pair of polymeric, incremental lens members each of the Fresnel-type in juxtaposition and sealed together at the edge, said lens members being aligned to dispose the optic axis of the refracting increments coaxially, and each of said pair of lens members having on a face at four positions, spaced radially from the axis and spaced circumferentially on radial lines 90* apart, one of a V-groove or mating rib extending in a radial direction and in opposed relationship to a cooperating groove or rib on the other lens member.
Claim 2
Dependent Claim
92 words
A lens comprising a pair of polymeric, incremental lens members each of the Fresnel-type in juxtaposition and sealed together at the edge, said lens members being aligned to dispose the optic axis of the refracting increments coaxially, and each of said pair of lens members having on a face at four positions, spaced radially from the axis and spaced circumferentially on radial lines 90* apart, one of a V-groove or mating rib extending in a radial direction and in opposed relationship to a cooperating groove or rib on the other lens member.
Claim 3
Dependent Claim
47 words
A lens according to cLaim 1 wherein the refracting incremental ridges of the lens members are in opposed relationship, the lens members are rectangular, the grooves and ribs are disposed at the corners of the lens members, and the lens members are sealed about their entire circumference.
Claim 4
Independent Claim
117 words
A method of aligning the optic axis of a pair of flat incremental lens members each of which is formed with a radially extending V-groove or mating rib at each of four positions, spaced radially from the axis of the lens member and spaced circumferentially on radial lines 90* apart, to mate with a groove or rib similarly located on the other lens member, comprising the steps of: placing said lens members in juxtaposition with grooves and ribs in opposed relationship, engaging the ribs with the grooves at all four positions about the circumference of the lens, and sealing the lens members together at the edge, whereby the optic axis of the two lens member are coaxial.
Claim 5
Independent Claim
117 words
A method of aligning the optic axis of a pair of flat incremental lens members each of which is formed with a radially extending V-groove or mating rib at each of four positions, spaced radially from the axis of the lens member and spaced circumferentially on radial lines 90* apart, to mate with a groove or rib similarly located on the other lens member, comprising the steps of: placing said lens members in juxtaposition with grooves and ribs in opposed relationship, engaging the ribs with the grooves at all four positions about the circumference of the lens, and sealing the lens members together at the edge, whereby the optic axis of the two lens member are coaxial.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |