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found this by accident looky looky

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#1 gnowellsct

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Posted 11 February 2011 - 12:35 AM

http://www.patentsto...escription.html

#2 orlyandico

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Posted 11 February 2011 - 03:47 AM

it's the grand-daddy of the astrotrac!

#3 Ad Astra

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Posted 11 February 2011 - 11:20 AM

patent issued in 1977, expired in 1994... how come no one put it into production if all the claims in the abstract were true?

Wish I could see the full PDF drawings - kinda hard to appreciate it this way!

Dan

#4 Starhawk

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Posted 11 February 2011 - 11:28 AM

True tracking requires a continually changing rate for the drive mechanism in this design. So, it isn't really that big a simplification unless exposure times are relatively short and low magnifications hide the continual drive error.

-Rich

#5 orlyandico

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Posted 11 February 2011 - 12:22 PM

... which is what the astrotrac does.. it uses a processor to continually vary the drive rate on the gear.

the above patent looks like an astrotrack, but is really a barndoor. well the astrotrac is a finely-made barndoor with a microprocessor-controlled motor drive.

funny because even in 1977 you could get a cpu to drive a stepper motor and it was cheap.






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