New Canon lenses with built-in motor

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Article #17301

#17301

From: jpexg
Date: Mon, 23 Feb 1987 07:04

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I was skimming through the Photography section of Sunday's New York Times,
the subject of which was a new series of lenses produced by Canon for their
35mm cameras. It seems that unlike Minolta's Maxxum system, which puts a
motor for focusing the lens in the camera body, Canon has put the motor in
the lens itself, with "no discernible increase in size or weight". The
motor is claimed to use "ultrasound, instead of conventional electromagnets";
can anyone guess how it works?

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watnot!watmath!clyde!rutgers!mit-eddie!mit-hermes!jpexg
From: jpexg@mit-hermes.UUCP
Newsgroups: sci.electronics
Subject: New Canon lenses with built-in motor
Message-ID: <2807@mit-hermes.AI.MIT.EDU>
Date: Mon, 23-Feb-87 02:04:30 EST
Article-I.D.: mit-herm.2807
Posted: Mon Feb 23 02:04:30 1987
Date-Received: Tue, 24-Feb-87 02:53:44 EST
Organization: MIT AI Lab, Cambridge, MA
Lines: 7
Keywords: "Ultrasonic motor"??