GB930848A - Improvements in or relating to cathode ray tube display apparatus - Google Patents
Improvements in or relating to cathode ray tube display apparatusInfo
- Publication number
- GB930848A GB930848A GB3770760A GB3770760A GB930848A GB 930848 A GB930848 A GB 930848A GB 3770760 A GB3770760 A GB 3770760A GB 3770760 A GB3770760 A GB 3770760A GB 930848 A GB930848 A GB 930848A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filter
- hood
- display
- plate
- tube
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers
- H04N5/65—Holding-devices for protective discs or for picture masks
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
930,848. Television. DECCA Ltd. Jan. 29, 1962 [Nov. 2, 1960], No. 37707/60. Class 40 (3). [Also in Group XL (c)] Reflections of ambient light by the screen of a cathode-ray tube (e.g. for television or radar display) are prevented from reaching the viewer by means of an optical filter 15 (Figs. 1 to 3) or 33 (Fig. 4) positioned, in front of the tube screen, within a hood 12, 13, 14 (Figs. 1 to 3) or 32 (Fig. 4) the arrangement being such that ambient light reflected by the filter is obscured by the hood. The filters are either neutral density filters or are tinted to attenuate ambient light more than light emitted by the tube screen. The filter 15, which is formed as a cylindrically curved sheet, is hinged at 16 and when not in use may be held against the top surface 12 of the hood by a spring clip 17. When this filter is also to act as an implosion guard (e.g. by forming it of thick material) the hinge is omitted and it is secured rigidly in the hood and to allow insertion of the hand behind the filter (e.g. for writing on the tube screen) a hinged or sliding door 18 is provided in the bottom surface 13 of the hood. The interior of the latter should be absolutely black but when this is not so reflections by the filter which are directed towards the top surface 12 of the hood are prevented from reaching an observer by providing the latter surface with a number of ribs 19. In the embodiment of Fig. 4 the filter 33, which comprises a thin sheet 34 of filter material supported on a rigid plate 35 of glass of polymethyl methacrylate resin, is arranged in a plane at 45 degrees to the plane of the tube screen and to enable visual data to be superimposed of the tube display the top surface of the hood 32 is provided with an aperture 45 above which is positioned a transparent glass or plastic plate 36 edge illuminated by lamps 37 so that data written on the plate appears as a virtual image. The plate 36 may be provided with a graticule (e.g. for range and bearing in the case of a radar display) or it may be made rotatable and carry bearing markers. Additional data (e.g. from a chart or map) may be superimposed on the display by means of an assembly 38 pivotally mounted at 49 (to allow access to plate 36) containing the chart or map 39 mounted on rollers 40 and including lamps 42 which form an image of the chart &c. (preferably consisting of translucent markings on an opaque ground) on the filter 33. A colour filter may be positioned below plate 36 if the additional data is required to be produced in a particular colour and to eliminate parallax effects due to the curvature of the tube screen a correcting lens may be positioned in the aperture 45. Other display devices e.g. meters or indicators may be positioned within the hood so that additional visual images are superimposed on the main display (or near the edge thereof) and where (e.g. in radar operations rooms) the user of the display requires to see also information such as carried on display boards on the walls of the room a mirror may be arranged above an aperture formed in the top of the hood such that the mirror and the filter 33 form a periscope.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3770760A GB930848A (en) | 1960-11-02 | 1960-11-02 | Improvements in or relating to cathode ray tube display apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3770760A GB930848A (en) | 1960-11-02 | 1960-11-02 | Improvements in or relating to cathode ray tube display apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB930848A true GB930848A (en) | 1963-07-10 |
Family
ID=10398424
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3770760A Expired GB930848A (en) | 1960-11-02 | 1960-11-02 | Improvements in or relating to cathode ray tube display apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB930848A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4235523A (en) * | 1979-02-23 | 1980-11-25 | Digicourse Inc. | Controlled reflection readout for displays |
GB2161983A (en) * | 1984-07-16 | 1986-01-22 | Gen Electric | Contrast enhancement structure for color cathode ray tube |
GB2238937A (en) * | 1989-12-06 | 1991-06-12 | Bailey Concepts Limited | Anti-reflection housing for a VDU |
FR2695213A1 (en) * | 1992-08-27 | 1994-03-04 | Laporte Philippe | Cathode tube image screen filter system - uses semi-reflecting mirror with screen at 45 degree angle to horizontal |
GB2284733A (en) * | 1993-12-09 | 1995-06-14 | Village Times Limited | Hood assembly |
-
1960
- 1960-11-02 GB GB3770760A patent/GB930848A/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4235523A (en) * | 1979-02-23 | 1980-11-25 | Digicourse Inc. | Controlled reflection readout for displays |
GB2161983A (en) * | 1984-07-16 | 1986-01-22 | Gen Electric | Contrast enhancement structure for color cathode ray tube |
GB2238937A (en) * | 1989-12-06 | 1991-06-12 | Bailey Concepts Limited | Anti-reflection housing for a VDU |
GB2238937B (en) * | 1989-12-06 | 1994-07-13 | Bailey Concepts Limited | Housing |
FR2695213A1 (en) * | 1992-08-27 | 1994-03-04 | Laporte Philippe | Cathode tube image screen filter system - uses semi-reflecting mirror with screen at 45 degree angle to horizontal |
GB2284733A (en) * | 1993-12-09 | 1995-06-14 | Village Times Limited | Hood assembly |
GB2284733B (en) * | 1993-12-09 | 1995-12-13 | Village Times Limited | Hood assembly |
US5485226A (en) * | 1993-12-09 | 1996-01-16 | Chipperfield; John S. | Hood assembly for a video display unit |
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