US3810196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure device for manufacturing a display screen of a colour television picture tube, comprising a rotating lens
Assignee: US Philips Corp
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Filing: 1972-04-25
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Granted: 1974-05-07
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Expires: 1992-04-25
Abstract
Abstract An exposure device for display screens having either a rotationally symmetric lens, a plane parallel plate or a prismatic plate that rotates during the exposure operation of the device to provide exposed dots on the screen that are of smaller dimensions than the apertures in the mask employed.
Inventors
- 👤 P Barten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:09
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271; H01J9/2272
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
161 words
A device for exposing a surface portion of a photosensitive layer to light passing through an aperture in a mask to produce an exposed surface portion smaller in area than the area of the aperture in the mask comprising a light source for emitting a lIght beam on a first axial path, optical means having an axis of rotation substantially coincident with said first axial path positioned between said light source and the mask in said first axial path for causing a virtual displacement of the light beam and for directing the emerging virtual light beam portion into a second axial path which is substantially parallel to said first axial path, and means for rotating said optical means about said axis of rotation whereby the virtual light beam portion circulating about said first axial path exposes through the aperture in the mask a surface portion of a photosensitive layer which is smaller than the area of the aperture in the mask.
Claim 2
Independent Claim
161 words
A device for exposing a surface portion of a photosensitive layer to light passing through an aperture in a mask to produce an exposed surface portion smaller in area than the area of the aperture in the mask comprising a light source for emitting a lIght beam on a first axial path, optical means having an axis of rotation substantially coincident with said first axial path positioned between said light source and the mask in said first axial path for causing a virtual displacement of the light beam and for directing the emerging virtual light beam portion into a second axial path which is substantially parallel to said first axial path, and means for rotating said optical means about said axis of rotation whereby the virtual light beam portion circulating about said first axial path exposes through the aperture in the mask a surface portion of a photosensitive layer which is smaller than the area of the aperture in the mask.
Claim 3
Dependent Claim
15 words
A device according to claim 1 wherein said optical means is a plane parallel plate.
Claim 4
Dependent Claim
34 words
A device according to claim 1 wherein said optical means is a prismatic plate having a bottom surface orthogonal to said axis and a top surface inclined to said axis at an acute angle.
Claim 5
Dependent Claim
26 words
A device according to claim 1 further including additional optical means for adjusting the direction of said second axial path of said virtual light beam portion.
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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |