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03-31-2011, 03:35 AM   #1
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Ring motor

If anyone is interested: TORIC MOTOR AND LENS BARREL HAVING ... - Google Patent Search

/P

03-31-2011, 03:55 AM   #2
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Maybe there is hope for faster in lens motors. Unfortunately, a lot of patents never see the light of day, they are more hedging bets against possible future moves.
03-31-2011, 04:03 AM   #3
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It appears that this patent was filed more than a year ago. It's probably already been implemented as the DC motor in the 18-135 (which Pentax has mentioned would be used for all consumer grade DA lenses from now on, by the way).
03-31-2011, 04:17 AM   #4
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I doubt it, mainly because it's not a DC-motor, secondly a ring motor would be a big thing for Pentax so they would probably advertise it more.

But I doubt it will ever be used, not in that form. It seems way to complicated (read expensive) compared to sonic motors.

03-31-2011, 05:17 AM   #5
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QuoteOriginally posted by Gimbal Quote
I doubt it, mainly because it's not a DC-motor, secondly a ring motor would be a big thing for Pentax so they would probably advertise it more.

But I doubt it will ever be used, not in that form. It seems way to complicated (read expensive) compared to sonic motors.
Yeah, you're right that it probably hasn't been implemented, as a closer look at the description reveals that this is quite experimental, without any sort of firm design.

However, it should be noted that this patent is about the configuration of the stator/rotor, and not about the driving force behind the motor. It can fundamentally be driven by any number of types of motors, examples of which they state include ultrasonic and brushless DC. The example implementation they give is pretty explicitly a brushless DC motor (see page 8-9).

Last edited by Cannikin; 03-31-2011 at 05:39 AM.
03-31-2011, 04:17 PM   #6
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QuoteOriginally posted by Cannikin Quote
It appears that this patent was filed more than a year ago. It's probably already been implemented as the DC motor in the 18-135 (which Pentax has mentioned would be used for all consumer grade DA lenses from now on, by the way).
One year ago was a different patent and this here is not the dc motor used in the 18-135.
04-01-2011, 12:27 AM   #7
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Still a promising sign that they are thinking. I hope one of them will see the light of day.
04-01-2011, 03:05 PM   #8
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Yes,they are

04-02-2011, 12:28 AM   #9
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QuoteOriginally posted by zackspeed Quote
Yes,they are
mid or end of 2012?
04-02-2011, 04:24 AM   #10
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What I would be hoping for would be re releases of the DA 16-50 and 50-135 with such a motor.
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