US4154506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection lens plate for microfiche
Assignee: Izon Corp
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Filing: 1976-08-12
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Granted: 1979-05-15
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Expires: 1996-08-12
Abstract
Abstract A projection lens plate for a microfiche and method of its manufacture. A base or substrate having greater dimensional stability against creepage, humidity, and thermal cycling than the optic material carries a plurality of openings for receiving extruded optic material, the optic material forming lenses after hardening. Extrusion passages in a die head carry the optic material to the substrate openings. The die head is provided with accurately spaced lens-forming cavities onto which the optic material flows to thereby form lenses. By this process and apparatus the lenses are very accurately located relative to each other, while the openings in the substrate need not be accurately located relative to each other. The substrate openings are larger than the diameter of the lenses. Further, by fashioning the substrate of a dimensionally stabler material than the lens material, accurate registry of the lenses vis a vis each other is maintained.
Inventors
- 👤 George J. Yevick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:27
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00365; B29D11/00375; B29D11/00278
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
A generally planar lens plate having an apertured substrate, the apertures being filled with a lens forming plastic material to thereby define lenses in the apertures, the coefficient of thermal and of humidity expansion of the substrate being less than those of the lens material, each lens of the lens plate being a compound lens, one of the lenses of each compound lens having an aperture which receives another, second lens within a portion of the said one, first mentioned lens.
Claim 2
Dependent Claim
81 words
A generally planar lens plate having an apertured substrate, the apertures being filled with a lens forming plastic material to thereby define lenses in the apertures, the coefficient of thermal and of humidity expansion of the substrate being less than those of the lens material, each lens of the lens plate being a compound lens, one of the lenses of each compound lens having an aperture which receives another, second lens within a portion of the said one, first mentioned lens.
Claim 3
Dependent Claim
75 words
A generally planar lens plate having an apertured substrate, the apertures being filled with a lens forming plastic material to thereby define lenses in the apertures, the creepage of the substrate being less than that of the lens material, each lens of the lens plate being a compound lens, one of the lenses of each compound lens having an aperture which receives another, second lens within a portion of the said one, first mentioned lens.
Claim 4
Dependent Claim
75 words
A generally planar lens plate having an apertured substrate, the apertures being filled with a lens forming plastic material to thereby define lenses in the apertures, the creepage of the substrate being less than that of the lens material, each lens of the lens plate being a compound lens, one of the lenses of each compound lens having an aperture which receives another, second lens within a portion of the said one, first mentioned lens.
Claim 5
Dependent Claim
91 words
A generally planar lens plate having an apertured substrate, the apertures being filled with a lens forming plastic material to thereby define lenses in the apertures, the coefficient of thermal and of humidity expansion of the substrate being less than those of the lens material, each lens of the lens plate being a compound lens, one of the lenses of each compound lens having an aperture which received another, second lens within a portion of the said one, first mentioned lense, each aperture being of a nonuniform diameter along its depth.
Claim 6
Dependent Claim
91 words
A generally planar lens plate having an apertured substrate, the apertures being filled with a lens forming plastic material to thereby define lenses in the apertures, the coefficient of thermal and of humidity expansion of the substrate being less than those of the lens material, each lens of the lens plate being a compound lens, one of the lenses of each compound lens having an aperture which received another, second lens within a portion of the said one, first mentioned lense, each aperture being of a nonuniform diameter along its depth.
References Cited (Backward Citations)
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Cited
US1466973A
Cited
US3263088A
Cited
US3532038A
Cited
US3586816A
Cited
US3706486A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |