Reproduction lens of high image-resolving power with an image-side numerical aperture of 0.5 comprising three doublets and three single lens elements
Abstract
Abstract A REPRODUCTION LENS OF HIGH IMAGE-RESOLVING POWER COMPRISES THREE DOUBLETS, AND THREE SINGLE LENS ELEMENTS, I, II, III/IV, V/VI, VII, VIII/IX FROM OBJECT SIDE TO IMAGE SIDE, AND IS DIVIDED INTO THREE GROUPS. THE FIRST GROUP CONSISTS OF THE ELEMENTS I AND II, I BEING A DISPRESIVE MENISCUS, AND II BEING A CONVERGENT ELEMENT. THE SECOND GROUP CONSISTS OF TWO CEMENTED CONVERGENT DOUBLETS III/VI AND V/VI, WHEREOF THE SINGLE ELEMENTS III AND V ARE CONVERGENT AND THE SINGLE ELEMENTS IV AND VI ARE DIVERGENT. THE THIRD GROUP CONSISTS OF THE CONVERGENT ELEMENT VII AND THE CEMENTED THICK MENISCUS VIII/IX. THE LENS APERTURE IS 0.5. THE FOCAL LENGTH OF THE LENS IS 15MM. THE IMAGE SCALE IS 1:15. THE LENS IS SUITABLE FOR MICROPHOTOGRAPHIC TECHNIQUES AND MICRO-WAVE CIRCUITS.
Inventors
- 👤 Doris Trebitz
- 👤 Ernst Rumpoldin
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |