- Email: [email protected]
Viewdata expertise exported
Displags neuJs
Shadow mask sheet unveiled Nippon Kokan and Nippon Mining Ltd have jointly developed a shadow mask sheet for colour telewision set and colour computer monitor crt's. The sheet of aluminium-killed steel is produced by continuous casting. Usually rimmed steel is used for the masks. A shadow mask is a cold-rolled steel sheet panel, with about 400 000 small slots, embedded in the crt of colour tv's. Shadow masks for computer monitor displays must have more accurate, uniform slots numbering three times those of masks for television. The slots of masks for the tv sets are usually 0.1 mm x 0.2 mm and the space between slots is less than 0.1 mm. Cold-rolled sheets for masks call for stringent quality, much higher than for conventional cold-rolled sheets. For this reason, the yield ratio of rimmed steel sheets, up to the finished stage of the shadow masks, is less than 50%. However, if the newly developed aluminium steel is used, the yield ratio it is claimed is improved to almost 100%.
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Rimmed steel contains a relatively high level of non-metallic inclusions, which make it difficult in the etching process to form uniform slots of high dimensional accuracy. Although the large size grain structure of the steel gives good formability, the structure hinders obtaining high accuracy in the press operation because of deformation.
NKK's aluminium-killed steel is produced by specially controlled continuous casting, apparently minimizing non-metalHc inclusions. It inherently contains less oxygen and the yield stress can be reduced to less than 10 kgf mm -2 . The decarbonization process maintains the small grain structure and ensures slots of highly uniform shape. Nippon Kokan KK, 4th Floor, West Block, 11 Moorfields High Walk, London EC2Y 9DE, UK
Ireland's o w n Ireland's first private Viewdata service is planned to be launched before the end of 1980. Photo Advertising Ltd have bought equipment from Redifon with the aim'of setting up a service geared specifically to Irish needs.
Electrongun
Redifon Computers Limited, Kelvin Way, Crawley, Sussex, UK
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Shadowmask
Shadow mask ~ I t t /Fluorescent Green <~.... J~J~ I " plate ~ +i.fl
Rank Electronic Tubes, Rank Precision Industries Ltd, Sidcup By-Pass, Sidcup, Kent DA 14 6LZ, UK
V i e w d a t a e x p e r t i s e exported Austria has become the fifth country to buy the technology of the British Post Office's Prestel system. Viewdata skill has also been sold to West Germany, the Netherlands, Hang Kong and Switzerland while negotiations are under way with organizations in the USA to set up a Viewdata service there. The contract with Austria is for the sale of the programs, or instructions, which control the operation of the computer on which the information is stored. At the same time, GEC Computers will be supplying a 4065 computer for a Viewdata trial in Austria. The announcement of this contract follows the adoption of the Prestel system as an international standard for Viewdata. The decision was taken by the relevant study groups of th$ International Consultative Committee on Telephones and Telegraphs.
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I?
Fluorescent plate
Red
principally involved in negative film scanning. The screen is subjected to critical evaluation to ensure its suitability for jump-scan and Digiscan modes of Cintel mark III operation.
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Function of a shadow mask in a crt
DISPLAYS. OCTOBER 1980
Telecine scanning tubes Rank Electronic Tubes has introduced two flying spot crt's to support the flexibility of operation now possible with Cintel mark III telecines. The range comprises three tube types. The first remains available to service telecine equipment used for positive film scanning. The second is suitable for telecine operations where above-average screen quality is required to handle both positive and negative film scanning. While the third aims to meet the needs of post-production houses
British Telecom, Public Relations Department, 23/-lowland Street, London WIP 6HQ, UK
A r a b i c and Latin characters In the Arabic alphabet, letters change shape according to their position in the word and are written from right to left. The Ascribe, a bilingual vdu automatically alters Arabic characters' to their correct forms and positions them for left to right or right to left addressing. The operator has access to
107
Shadow mask sheet unveiled Nippon Kokan and Nippon Mining Ltd have jointly developed a shadow mask sheet for colour telewision set and colour computer monitor crt's. The sheet of aluminium-killed steel is produced by continuous casting. Usually rimmed steel is used for the masks. A shadow mask is a cold-rolled steel sheet panel, with about 400 000 small slots, embedded in the crt of colour tv's. Shadow masks for computer monitor displays must have more accurate, uniform slots numbering three times those of masks for television. The slots of masks for the tv sets are usually 0.1 mm x 0.2 mm and the space between slots is less than 0.1 mm. Cold-rolled sheets for masks call for stringent quality, much higher than for conventional cold-rolled sheets. For this reason, the yield ratio of rimmed steel sheets, up to the finished stage of the shadow masks, is less than 50%. However, if the newly developed aluminium steel is used, the yield ratio it is claimed is improved to almost 100%.
\
Rimmed steel contains a relatively high level of non-metallic inclusions, which make it difficult in the etching process to form uniform slots of high dimensional accuracy. Although the large size grain structure of the steel gives good formability, the structure hinders obtaining high accuracy in the press operation because of deformation.
NKK's aluminium-killed steel is produced by specially controlled continuous casting, apparently minimizing non-metalHc inclusions. It inherently contains less oxygen and the yield stress can be reduced to less than 10 kgf mm -2 . The decarbonization process maintains the small grain structure and ensures slots of highly uniform shape. Nippon Kokan KK, 4th Floor, West Block, 11 Moorfields High Walk, London EC2Y 9DE, UK
Ireland's o w n Ireland's first private Viewdata service is planned to be launched before the end of 1980. Photo Advertising Ltd have bought equipment from Redifon with the aim'of setting up a service geared specifically to Irish needs.
Electrongun
Redifon Computers Limited, Kelvin Way, Crawley, Sussex, UK
~
•
tJ/ii
Shadowmask
Shadow mask ~ I t t /Fluorescent Green <~.... J~J~ I " plate ~ +i.fl
Rank Electronic Tubes, Rank Precision Industries Ltd, Sidcup By-Pass, Sidcup, Kent DA 14 6LZ, UK
V i e w d a t a e x p e r t i s e exported Austria has become the fifth country to buy the technology of the British Post Office's Prestel system. Viewdata skill has also been sold to West Germany, the Netherlands, Hang Kong and Switzerland while negotiations are under way with organizations in the USA to set up a Viewdata service there. The contract with Austria is for the sale of the programs, or instructions, which control the operation of the computer on which the information is stored. At the same time, GEC Computers will be supplying a 4065 computer for a Viewdata trial in Austria. The announcement of this contract follows the adoption of the Prestel system as an international standard for Viewdata. The decision was taken by the relevant study groups of th$ International Consultative Committee on Telephones and Telegraphs.
/,
I?
Fluorescent plate
Red
principally involved in negative film scanning. The screen is subjected to critical evaluation to ensure its suitability for jump-scan and Digiscan modes of Cintel mark III operation.
t /
Function of a shadow mask in a crt
DISPLAYS. OCTOBER 1980
Telecine scanning tubes Rank Electronic Tubes has introduced two flying spot crt's to support the flexibility of operation now possible with Cintel mark III telecines. The range comprises three tube types. The first remains available to service telecine equipment used for positive film scanning. The second is suitable for telecine operations where above-average screen quality is required to handle both positive and negative film scanning. While the third aims to meet the needs of post-production houses
British Telecom, Public Relations Department, 23/-lowland Street, London WIP 6HQ, UK
A r a b i c and Latin characters In the Arabic alphabet, letters change shape according to their position in the word and are written from right to left. The Ascribe, a bilingual vdu automatically alters Arabic characters' to their correct forms and positions them for left to right or right to left addressing. The operator has access to
107