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Equipment Discussions >> Mounts

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gnowellsct
Postmaster
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Reged: 06/24/09

found this by accident looky looky new
      #4377963 - 02/11/11 12:35 AM

http://www.patentstorm.us/patents/4050318/description.html

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orlyandico
Postmaster
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Reged: 08/10/09

Loc: Singapore
Re: found this by accident looky looky new [Re: gnowellsct]
      #4378117 - 02/11/11 03:47 AM

it's the grand-daddy of the astrotrac!

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Ad Astra
professor emeritus
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Reged: 05/12/10

Loc: Riverside Co., California
Re: found this by accident looky looky new [Re: orlyandico]
      #4378650 - 02/11/11 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


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Starhawk
Space Ranger
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Reged: 09/16/08

Loc: Tucson, Arizona
Re: found this by accident looky looky new [Re: Ad Astra]
      #4378672 - 02/11/11 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


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orlyandico
Postmaster
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Reged: 08/10/09

Loc: Singapore
Re: found this by accident looky looky [Re: Starhawk]
      #4378782 - 02/11/11 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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