Originally posted by Gimbal That patent does not describe a Direct Current (DC)-motor. A direct current motor runs on direct current, the one described in the patent needs alternating phases or pulses to run.
A DC-motor is usually found in the cheapest of toys. So it's probably a new micromotor with a new name to differentiate it from the old ones. Nothing fancy at all.
If you read the full patent they talk about the fixed alternating multi-pole magnets and then controlled magnets required to step the lens to the next fixed point.
There are two types of electromagnets (well 3) the AC type which is either a DC-magnet with a built in AC-DC converter (obviously not this) and a then are laminated core AC-magnets, these produce an alternating magnetic field, and therefore would be useless for this patent.
There are two types of DC-electromagnets. One is useless to the patent, but a bi-polar magnet, flips poles when a DC current is applied. This is the type they are talking about.
So they may in-fact be using DC to identify the described technology. Though it is doubtful, as even the patent describes a "DC-motor" aka. current micromotor.