[time-nuts] MEMS oscillators

David Smith w6te at msn.com
Wed Oct 31 18:53:19 EDT 2018


What a hoot! I was an engineer for a company in the early 1970's (1972, 73, I think) where we used an Eidophor projector for a large arena crowd projecting the Indie 500 on a huge screen The arena held about 10,000. The technology didn't last for more than a few years as I recall.

Dave W6TE 

-----Original Message-----
From: time-nuts <time-nuts-bounces at lists.febo.com> On Behalf Of Julien Goodwin
Sent: Wednesday, October 31, 2018 2:54 PM
To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>; Joe Leikhim <jleikhim at leikhim.com>
Subject: Re: [time-nuts] MEMS oscillators

Reminds me a little of the crazy Eidophor projectors.

"An Eidophor was a television projector used to create theater-sized images. The name Eidophor is derived from the Greek word-roots ‘eido’
and ‘phor’ meaning 'image' and 'bearer' (carrier). Its basic technology was the use of electrostatic charges to deform an oil surface."

https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D3-BvMcqEc98&data=02%7C01%7C%7Cd720898b578648fbd62b08d63f7b9f89%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636766197521921210&sdata=L4V5rmgatXykrhBV%2BLDABHzUmsb%2FOPZfb4WkebsejcE%3D&reserved=0

https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FEidophor&data=02%7C01%7C%7Cd720898b578648fbd62b08d63f7b9f89%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636766197521921210&sdata=qn66ZlL8EjI%2FpeRD3qxxzt8qPN5vUEaqTtL4tL%2B6yZA%3D&reserved=0

On 31/10/18 04:39, Joe Leikhim wrote:
> This is fascinating. I am a bit skeptical if this actually happened.
> 
> I had an opportunity to meet an engineer that was involved with early 
> HDTV development. Apparently early in his career he invented a color 
> projection CRT for cinema. It had some sort of target inside of it (I 
> think plastic) that was subjected to the electron beam but would 
> outgas hydrogen in significant amounts and that hydrogen would ionize 
> in the electron beam which was undesired. So they incorporated a band 
> of titanium around the neck of the tube and the titanium apparently 
> allows hydrogen to collect and migrate through it even though there is 
> a vacuum inside the tube. It worked as intended. Then the Chinese 
> tried to replicate the design and did not use a titanium band because 
> they had no idea it had a purpose. Their tubes failed miserably.
> 
> 

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