EP0001673B1 - Farbwahlelektrode mit schlitzförmigen Öffnungen in einer Farbbildröhre - Google Patents
Farbwahlelektrode mit schlitzförmigen Öffnungen in einer Farbbildröhre Download PDFInfo
- Publication number
- EP0001673B1 EP0001673B1 EP78200260A EP78200260A EP0001673B1 EP 0001673 B1 EP0001673 B1 EP 0001673B1 EP 78200260 A EP78200260 A EP 78200260A EP 78200260 A EP78200260 A EP 78200260A EP 0001673 B1 EP0001673 B1 EP 0001673B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- colour
- selection electrode
- apertures
- colour selection
- rows
- 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
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 4
- 239000003086 colorant Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/06—Screens for shielding; Masks interposed in the electron stream
- H01J29/07—Shadow masks for colour television tubes
- H01J29/076—Shadow masks for colour television tubes characterised by the shape or distribution of beam-passing apertures
Definitions
- the invention relates to a colour selection electrode in a colour display tube comprising in an evacuated envelope consisting of a display window, a cone and a neck, a display screen on the inside of the display window consisting of a large number of phosphor lines luminescing in three different colours the said electrode being disposed at some distance in front of the display screen, and comprising a metal plate having a very large number of rows of apertures which are separated from each other by bridges and are elongate in the direction of the rows, the said rows extending in the direction of the phosphor lines.
- Such a colour display tube is disclosed in United States Patent Specification 3,983,613.
- a photosensitive phosphor-containing layer is provided a few times successively (usually 3 times) on the display window which is then exposed via the elongate apertures in the colour selection electrode and is then fixed, so that the phosphor lines are formed on the display screen.
- the said exposure is carried out by means of an elongate light source whose longitudinal axis extends in the direction of the rows of apertures, so that the light distribution behind the rows of apertures which are separated by bridges is as homogeneous as possible.
- a colour selection electrode of the kind described in the first paragraph is characterized in that the last aperture at the two ends of each row being at least equally long as the penultimate aperture at the two ends of each row, and the short sides of the last apertures of all rows situated at the extreme ends are situated on lines which follow the edges of the colour selection electrode. Generally these edges are curved since the aperture which is situated at the ends of each row is as long as but usually is longer than the penultimate aperture, more light will impinge on the photosensitive phosphor-containing layer during exposure and the end of the phosphor line will adhere better to the inner wall of the display window.
- FIG. 1 is a perspective view, partly broken away, of a colour display tube made in accordance with the invention.
- This colour display tube comprises a glass envelope 1 which is composed of a display window 2, a cone 3 and a neck 4 having contact pins 5.
- Three electron guns 6, 7 and 8 are situated in the neck. The axes of these guns are situated in one horizontal plane and the outermost guns enclose a small angle with the central gun, so that the generated electron beams 9, 10 and 11 pass through apertures 12 in a colour selection electrode 13 at an angle and thus each impinge on phosphor lines 14, 15 and 16, respectively.
- the whole display screen 17 consists of such triplets of phosphor lines of which three are shown.
- Phosphor line 14 is a phosphor luminescing red (R)
- phosphor line 15 is a phosphor luminescing green (G)
- phosphor line 16 is a phosphor luminescing blue (B).
- Colour selection electrode 13 consists of a metal plate having a very large number of rows of apertures 12 extending in the direction of the phosphor lines, which plate is secured in a metal ring 18 which is mounted in the display tube in front of the display screen.
- Figure 2 is a perspective view of a part of the colour selection electrode 13 and the display screen 17.
- the apertures 12 of each row are separated by bridges 19.
- the elongate apertures usually have rounded-off short sides.
- Figure 3 is an elevation of a part of an upper edge of a known colour selection electrode. As a result of the curved shape of the said upper edge, apertures 20 are obtained which are shorter than the adjacent apertures 12. During the manufacture of the display screen an insufficient amount of light passes through the said apertures and an unsatisfactory adhesion of the ends of the phosphor lines to the display window is obtained.
- Figure 4 is an elevation of a part of the upper edge of the colour selection electrode as disclosed in United States Patent Specification 3,983,613. The smaller apertures are omitted. The picture boundary shown in Figure 3 and the adhesion of the ends of the phosphor lines still leaves something to be desired.
- Figure 5 is an elevation of a part of the upper edge of the colour selection electrode to be used in the cathode ray tube shown in Figure 1.
- the length of the last apertures 22 is always larger than or equal to the length of the adjacent apertures 12 in the row.
- the short sides of the last apertures 22 of all rows situated at the extreme end are situated on a smooth curved line which follows the edge 21 of the colour selection electrode. Since the apertures 22 are extra long a better adhesion of the phosphor lines to the inner wall of the display window is obtained during the manufacture of the said lines as a result of the extra good exposure at the ends. These longer apertures at the same time ensure a beautiful smooth picture boundary.
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7711713 | 1977-10-26 | ||
NL7711713A NL7711713A (nl) | 1977-10-26 | 1977-10-26 | Kleurenbeeldbuis. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0001673A2 EP0001673A2 (de) | 1979-05-02 |
EP0001673A3 EP0001673A3 (en) | 1979-05-16 |
EP0001673B1 true EP0001673B1 (de) | 1981-01-07 |
Family
ID=19829406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP78200260A Expired EP0001673B1 (de) | 1977-10-26 | 1978-10-23 | Farbwahlelektrode mit schlitzförmigen Öffnungen in einer Farbbildröhre |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0001673B1 (de) |
JP (1) | JPS5471556A (de) |
CA (1) | CA1121857A (de) |
DE (1) | DE2860435D1 (de) |
ES (1) | ES474452A1 (de) |
IT (1) | IT1099429B (de) |
NL (1) | NL7711713A (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4121233A1 (de) * | 1990-07-02 | 1992-01-16 | Thomson Consumer Electronics | Farbbildroehre mit lochmaske |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5814735A (ja) * | 1981-07-20 | 1983-01-27 | 忠見 佳彦 | 内装材の製造方法 |
JPS5840745A (ja) * | 1981-09-02 | 1983-03-09 | Sony Corp | カラ−陰極線管 |
US4631440A (en) * | 1985-04-29 | 1986-12-23 | North American Philips Consumer Electronics Corp. | Color cathode ray tube having smooth screen edges |
GB8708574D0 (en) * | 1987-04-10 | 1987-05-13 | Philips Nv | Colour cathode ray tube |
US5583391A (en) * | 1995-11-15 | 1996-12-10 | Thomson Consumer Electronics, Inc. | Color picture tube shadow mask having improved mask aperture pattern |
KR100411512B1 (ko) * | 1997-01-21 | 2004-02-14 | 엘지마이크론 주식회사 | 섀도우마스크 유효부 제조방법 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7200212A (de) * | 1971-01-14 | 1972-07-18 | ||
JPS5244511B2 (de) * | 1972-08-30 | 1977-11-08 | ||
US3766419A (en) * | 1972-11-10 | 1973-10-16 | Rca Corp | Cathode-ray tube with shadow mask having random web distribution |
JPS6024533B2 (ja) * | 1973-12-10 | 1985-06-13 | 日本電気株式会社 | シヤドウマスクの製造方法 |
CA1065003A (en) * | 1975-05-05 | 1979-10-23 | Albert M. Morrell | Cathode ray tube having improved line-screen structure |
-
1977
- 1977-10-26 NL NL7711713A patent/NL7711713A/xx not_active Application Discontinuation
-
1978
- 1978-10-19 CA CA000313787A patent/CA1121857A/en not_active Expired
- 1978-10-23 JP JP13037478A patent/JPS5471556A/ja active Pending
- 1978-10-23 DE DE7878200260T patent/DE2860435D1/de not_active Expired
- 1978-10-23 IT IT29012/78A patent/IT1099429B/it active
- 1978-10-23 EP EP78200260A patent/EP0001673B1/de not_active Expired
- 1978-10-24 ES ES474452A patent/ES474452A1/es not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4121233A1 (de) * | 1990-07-02 | 1992-01-16 | Thomson Consumer Electronics | Farbbildroehre mit lochmaske |
DE4121233C2 (de) * | 1990-07-02 | 1998-03-12 | Thomson Consumer Electronics | Farbbildröhre mit Lochmaske |
Also Published As
Publication number | Publication date |
---|---|
DE2860435D1 (en) | 1981-02-26 |
EP0001673A2 (de) | 1979-05-02 |
CA1121857A (en) | 1982-04-13 |
IT7829012A0 (it) | 1978-10-23 |
JPS5471556A (en) | 1979-06-08 |
EP0001673A3 (en) | 1979-05-16 |
IT1099429B (it) | 1985-09-18 |
ES474452A1 (es) | 1979-10-16 |
NL7711713A (nl) | 1979-05-01 |
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