GB548750A - Improvements in or relating to projectors for the light image of a cathode-ray tube - Google Patents
Improvements in or relating to projectors for the light image of a cathode-ray tubeInfo
- Publication number
- GB548750A GB548750A GB45742A GB45742A GB548750A GB 548750 A GB548750 A GB 548750A GB 45742 A GB45742 A GB 45742A GB 45742 A GB45742 A GB 45742A GB 548750 A GB548750 A GB 548750A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mirror
- screen
- tube
- spherical
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0884—Catadioptric systems having a pupil corrector
- G02B17/0888—Catadioptric systems having a pupil corrector the corrector having at least one aspheric surface, e.g. Schmidt plates
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
Abstract
548,750. Optical-projection apparatus. PHILIPS LAMPS, Ltd. (Naamlooze Vennootschap Philips' Gloeilampenfabrieken). Jan. 12, 1942, No. 457. [Class 97 (i)] The image on the screen 2 of a cathoderay tube 1 is projected on to a screen 3 by means of a concave mirror 4 having its axis coincident with the axis of the tube, and by a mirror 6 inclined to this axis and apertured to receive the tube or to permit passage of light from it. The mirror 4 may be spherical, parabolic &c. and may be concentric with a spherical screen 2. Spherical and other aberrations may be corrected by a transparent plate 7 or by curvature of the mirror 6. The edge of the screen 2 may be tangential to the surface of the mirror 6, and the mirror surface may have an electric potential applied to it sufficient to prevent discharge to it from the screen 2 when the tube is in use, the mirror being insulated from the casing of the apparatus.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB45742A GB548750A (en) | 1942-01-12 | 1942-01-12 | Improvements in or relating to projectors for the light image of a cathode-ray tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB45742A GB548750A (en) | 1942-01-12 | 1942-01-12 | Improvements in or relating to projectors for the light image of a cathode-ray tube |
Publications (1)
Publication Number | Publication Date |
---|---|
GB548750A true GB548750A (en) | 1942-10-22 |
Family
ID=9704674
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB45742A Expired GB548750A (en) | 1942-01-12 | 1942-01-12 | Improvements in or relating to projectors for the light image of a cathode-ray tube |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB548750A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2476124A (en) * | 1940-09-30 | 1949-07-12 | Hartford Nat Bank & Trust Co | Folded schmidt television projector |
US2593724A (en) * | 1941-07-14 | 1952-04-22 | Optische Ind De Oude Delft Nv | Microscope with reflecting objective |
-
1942
- 1942-01-12 GB GB45742A patent/GB548750A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2476124A (en) * | 1940-09-30 | 1949-07-12 | Hartford Nat Bank & Trust Co | Folded schmidt television projector |
US2593724A (en) * | 1941-07-14 | 1952-04-22 | Optische Ind De Oude Delft Nv | Microscope with reflecting objective |
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