Richtige Fernseher haben Röhren!
In Brief: On this site you will find pictures and information about some of the electronic, electrical and electrotechnical technology relics that the Frank Sharp Private museum has accumulated over the years .
Premise: There are lots of vintage electrical and electronic items that have not survived well or even completely disappeared and forgotten.
Or are not being collected nowadays in proportion to their significance or prevalence in their heyday, this is bad and the main part of the death land. The heavy, ugly sarcophagus; models with few endearing qualities, devices that have some over-riding disadvantage to ownership such as heavy weight,toxicity or inflated value when dismantled, tend to be under-represented by all but the most comprehensive collections and museums. They get relegated to the bottom of the wants list, derided as 'more trouble than they are worth', or just forgotten entirely. As a result, I started to notice gaps in the current representation of the history of electronic and electrical technology to the interested member of the public.
Following this idea around a bit, convinced me that a collection of the peculiar alone could not hope to survive on its own merits, but a museum that gave equal display space to the popular and the unpopular, would bring things to the attention of the average person that he has previously passed by or been shielded from. It's a matter of culture. From this, the Obsolete Technology Tellye Web Museum concept developed and all my other things too. It's an open platform for all electrical Electronic TV technology to have its few, but NOT last, moments of fame in a working, hand-on environment. We'll never own Colossus or Faraday's first transformer, but I can show things that you can't see at the Science Museum, and let you play with things that the Smithsonian can't allow people to touch, because my remit is different.
There was a society once that was the polar opposite of our disposable, junk society. A whole nation was built on the idea of placing quality before quantity in all things. The goal was not “more and newer,” but “better and higher" .This attitude was reflected not only in the manufacturing of material goods, but also in the realms of art and architecture, as well as in the social fabric of everyday life. The goal was for each new cohort of children to stand on a higher level than the preceding cohort: they were to be healthier, stronger, more intelligent, and more vibrant in every way.
The society that prioritized human, social and material quality is a Winner. Truly, it is the high point of all Western civilization. Consequently, its defeat meant the defeat of civilization itself.
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.How to use the site:
OLD, but ORIGINAL, Well made, Funny, Not remotely controlled............. and not Made in CHINA.
- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the left blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. Doing so it starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.
You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.
- If you arrived here at the main page via bookmark you can visit all the site scrolling the left blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.
- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.
Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !
Every CRT Television saved let revive knowledge, thoughts, moments of the past life which will never return again.........
Many contemporary "televisions" (more correctly named as displays) would not have this level of staying power, many would ware out or require major services within just five years or less and of course, there is that perennial bug bear of planned obsolescence where components are deliberately designed to fail and, or manufactured with limited edition specificities..... and without considering........picture......sound........quality........
..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!
Have big FUN ! !
©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All sets and apparates appearing here are property of
Engineer Frank Sharp. NOTHING HERE IS FOR SALE !
Wednesday, October 2, 2013
XONYCS COLOUR TV RECEIVER RC4020PS CHASSIS RECOR RC4021A CRT TUBE SAMSUNG A48KRD82X01.
Generally, green, red, and blue phosphors are regularly arranged in a dotted or striped pattern in the inner surface of a color CRT, and electron beams irradiate onto a target dot or stripe to make the corresponding phosphor luminesce.
However, the electron beams do not irradiate onto a target dot or stripe exactly but an adjacent phosphor dot or stripe of another color may also luminesce, which lowers color purity. Also, a fluorescent layer may luminesce due to electrons scattering at the inner wall of a panel or around shadow mask apertures, which causes lowering of contrast.
To avoid such lowering of color purity and contrast, generally a non-luminescent absorbent such as graphite is filled in a space between the respective phosphor dots or stripes to form a black matrix.
A black matrix is largely classified into a negative black matrix and a positive black matrix according to the size of a phosphor dot or stripe and the size of an electron beam irradiating onto a dot or stripe.
According to the negative black matrix, the irradiated beam is made larger than the phosphor dot or stripe, a landing margin is excellent, and contrast and luminance can be improved. However, if the black matrix size between the red, green, and blue phosphors cannot be adjusted uniformly, a poor quality screen, e.g. a color blot, is liable to be generated.
The negative black matrix is generally fabricated in the following manner.
First, a negative photoresist forming composition comprising a base resin, a binder, a dispersant, and a hardening agent are applied to the inner surface of a panel of a CRT and dried to form a photoresist layer. Then, the photoresist layer is exposed to light and developed so that an exposed portion where phosphor patterns are to be formed is hardened by a photo-reaction, to thereby form a photoresist pattern having a strong adherence to an underlying layer (here, the inner surface of the CRT panel) and being not developed by water.
Subsequently, graphite is applied to the photoresist pattern to form a black matrix layer. Then, etching and developing processes are sequentially performed to remove the exposed portion of the photoresist layer and the black matrix material layer on the exposed layer, thereby completing a black matrix pattern.
As described above, the negative black matrix is, however, formed through a long and complicated process line, and requires an etching step in which materials detrimental to the environment are used.
Also, manufacturing cost is too high to use Ti-containing black pigment composition which can form a black matrix having excellent blackness.
On the contrary, according to a positive black matrix, the irradiated beam is made smaller than the phosphor dot or stripe. Although an excellent landing margin is not easily obtained, the positive black matrix is advantageous in being easily fabricated without an etching step. However, since a photoresist forming material suitable for this method is not in practical use, the positive black matrix is not widely used.
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide a method for forming a positive black matrix having excellent blackness and an improved landing margin.
Accordingly, to achieve the above objective, there is provided a method for forming a black matrix comprising the steps of:
coating a photoresist forming composition containing a compound represented by the formula (1) on the inner surface of a panel and drying the same to form a photoresist layer;
exposing the photoresist layer;
coating a black pigment solution for forming a black matrix on the photoresist layer and drying the same to form a black pigment layer; and
developing the resultant structure; ##STR2## wherein, X is a halogen atom and l:m:n is 1.0-4.5:70.0-98.0:1.0-20.0.
Particularly, the main chain of the compound represented by the formula (1) has a degree of polymerization of 300 to 4000. Also, the photoresist forming composition further comprises a surfactant of 0.5 to 5.0% by weight with respect to the compound represented by the formula (1). Here, if the content of the surfactant is not less than the above range, a sufficient surface activity does not occur, whereas, if the content of the sufactant is over the above range, surface activity is not enhanced further and the surplus amount of surfactant is not removed during subsequent processes.
Preferable examples of the surfactant include polyoxyethylene-polyoxypropylene copolymer (for example, PES manufactured by BASF AG.), fluorocarbon-denatured polyacrylate (for exampled, EFKA7070 manufactured by EFKA) or the like.
Also, the black pigment composition for forming the black matrix is not specifically restricted if it can be used in the art of the present invention, and preferably, it can be selected from graphite and Ti-containing black pigment composition. Particularly, the Ti-containing black pigment composition is more preferably because it can fabricate a black matrix having more excellent blackness than the conventional black matrix forming composition containing graphite.
The compound represented by the formula (1) which is a main component of the photoresist forming composition according to the present invention, is a copolymer of vinyl alcohol-vinyl acetate acetalated by 4-[2-(4-formyl phenyl)ethenyl]-1-methylpyridinium salt, which is nontoxic and excellent in storage stability and thermal stability. Also, whereas the photoresist forming composition used for forming the negative black matrix includes a base resin and a photosensitive agent causing a cross linkage reaction with the base resin, the photoresist forming composition according to the present invention does not require a separate photosensitive agent since the compound represented by the formula (1) itself has a function as a photosensitive agent.
According to the present invention, the positive photoresist forming composition containing the compound represented by the formula (1) is coated on the inner surface of the CRT panel to form a photoresist layer and then exposed using a shadow mask so that the exposed portion is softened to have a structure deprived of adhesiveness with the underlying layer (the inner surface of the CRT panel).
Subsequently, the black matrix forming composition is coated on the photoresist layer to form a black matrix material layer and developed with water, so that the exposed portion of the photoresist layer and the black matrix material layer formed thereon are easily developed and removed to thus form a black matrix pattern on the upper layer of the non-exposed portion, thereby providing a phosphor forming portion.
In other words, since the method of the present invention does not require an etching process, the process is simplified and is free from environmental contamination caused by using an etching solution.
Also, the photosensitivity of the compound represented by the formula (1) is so excellent that the profile of the formed pattern becomes better, thereby improving a landing margin, compared to the conventional positive black matrix.