US3647284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical display device
Assignee: Individual
•
Filing: 1970-11-30
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Granted: 1972-03-07
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Expires: 1990-11-30
Abstract
Abstract A pair of concave mirrors are placed with their concave sides toward each other and one is optically apertured, either with a hole in the mirror or by an unsilvered portion in a mirror of transparent material. An object placed at the mirror that is not apertured will project a real image at the region of the aperture if the curvature and spacings of the mirrors are correct. The image may be left-right reversed or may have the same orientation as the object depending upon the reflective paths of rays from the object. The image may be magnified or reduced in size depending upon curvatures and spacings of the mirrors.
Inventors
- 👤 Virgil B Elings
- 👤 Caliste J Landry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:59
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0856; G02B17/086; G02B17/008; G02B17/02; G02B17/06; G02B17/0605; G02B17/061; G02B17/0804; G02B17/0808; G02B30/00; G02B30/50; G02B30/56
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
An optical display device having an optical axis comprising: a. a concave first mirror formed as a surface of revolution of a curved line about said axis; b. a second mirror formed as a surface of revolution about said axis and spaced from said first mirror on the concave side thereof And concave toward the first mirror; characterized by one of said mirrors being optically apertured about said optical axis, the other of said mirrors having a continuous reflecting surface, the mirror curvatures being such that light rays from an object placed near that optical axis and near the other mirror will strike the one mirror, be reflected onto the other mirror and thereafter converge near the aperture to form a real image in the vicinity of the aperture, and a source of illumination is provided to illuminate the object to thereby enhance the brightness of the real image.
Claim 2
Dependent Claim
149 words
An optical display device having an optical axis comprising: a. a concave first mirror formed as a surface of revolution of a curved line about said axis; b. a second mirror formed as a surface of revolution about said axis and spaced from said first mirror on the concave side thereof And concave toward the first mirror; characterized by one of said mirrors being optically apertured about said optical axis, the other of said mirrors having a continuous reflecting surface, the mirror curvatures being such that light rays from an object placed near that optical axis and near the other mirror will strike the one mirror, be reflected onto the other mirror and thereafter converge near the aperture to form a real image in the vicinity of the aperture, and a source of illumination is provided to illuminate the object to thereby enhance the brightness of the real image.
Claim 3
Dependent Claim
41 words
An optical display device as set forth in claim 1 wherein the optical aperture is a physical hole in the one mirror and a transparent sheet is disposed between the mirrors to prevent removal of the object through the aperture hole.
Claim 4
Dependent Claim
27 words
An optical display device as set forth in claim 1 wherein the optical aperture is a transparent piece of material and protects the object from ready removal.
Claim 5
Dependent Claim
20 words
An optical display device as set forth in claim 1 wherein said source of illumination is disposed between the mirrors.
Claim 6
Dependent Claim
23 words
An optical display device as set forth in claim 1, wherein the region between the concave mirrors is filled with a transparent material.
Claim 7
Dependent Claim
33 words
An optical display device as set forth in claim 1, wherein the mirror not apertured has a removable portion in the area of the axis to assist in placing objects between the mirrors.
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |