US3752555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making multiple point holograms
Assignee: US Philips Corp
•
Filing: 1971-07-23
•
Granted: 1973-08-14
•
Expires: 1991-07-23
Abstract
Abstract A method and an apparatus for producing point holograms by means of an array of pinhole diaphragms is described. By illuminating the array of pinhole diaphragms through an array of zone plates disadvantages associated with known methods may be avoided.
Inventors
- 👤 E Klotz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:52
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/32
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
147 words
Apparatus for making multiple point holograms, comprising a source of coherent radiation, a plate of photosensitive material, optical means interposed in the path of the coherent radiation for focussing said radiation on the plate of photosensitive material, an array of pinhole diaphragms located between the optical means and the photosensitive material in the path of the radiation passing through the optical means, an array of zone plates having a binary phase structure located between the optical means and the array of pinhole diaphragms and arranged to focus the radiation eminating from the optical means on the array of pinhole diaphragms, the spacing of the array of zone plates being equal to that of the array of pinhole diaphragms, and phase plate means located on said array of pinhole diaphragms for randomly varying the phase of the radiation eminating from the zone plates and passing through the pinholes.
Claim 2
Dependent Claim
147 words
Apparatus for making multiple point holograms, comprising a source of coherent radiation, a plate of photosensitive material, optical means interposed in the path of the coherent radiation for focussing said radiation on the plate of photosensitive material, an array of pinhole diaphragms located between the optical means and the photosensitive material in the path of the radiation passing through the optical means, an array of zone plates having a binary phase structure located between the optical means and the array of pinhole diaphragms and arranged to focus the radiation eminating from the optical means on the array of pinhole diaphragms, the spacing of the array of zone plates being equal to that of the array of pinhole diaphragms, and phase plate means located on said array of pinhole diaphragms for randomly varying the phase of the radiation eminating from the zone plates and passing through the pinholes.
Claim 3
Dependent Claim
23 words
Apparatus as claimed in claim 1, wherein the phase plate means comprises a dielectric material vapour deposited on the array of pinhole diaphragms.
References Cited (Backward Citations)
US3405614A
Cited
US3545854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |