Reference Guide

ManualsBrandsCanon ManualsDigital CameraEOS 1

page

12

The

use

of

traveling

waves

as

a

source

of

drive

power

in

this

new

motor

is

completely

different

from

the

principle

of

conventional

motors

which

use

the

mutual

effects

of

electric

current

and

magnetic

fields

to

produce

rotary

motion.

Used

in

selected

Canon

EF

lenses

as

an

auto

focus

actuator,

this

is

the

world's

first

practical

implementation

of

ultrasonic

motors

in

a

consumer

product.

Changing

from

AF

to

manual

focus

can

be

accomplished

by

setting

a

switch

on

the

lens.

However,

with

the

EOS-l

and

the

EOS

630,

manual

focusing

is

possible

in

AF

mode

upon

focus

completion.

(No

external

switching

necessary.)

The

features

of

Canon's

ultrasonic

motor

include:

1.

Extremely

low

rotation

speed

(Maximum

speed

is

40

rpm,

with

a

control

range

from

0.2

to

40

rpm).

2.

High

torque

(1.6

kg/cm.)

3.

Low

power

consumption

(maximum

of

1

watt,

allowing

motor

to

be

powered

by

camera

batteries).

4.

Broad

range

of

operating

temperatures

(Normal

operating

range

is

-30C/-22F

to

60C/140F).

5.

Superior

control

due

to

unequaled

start/stop

response.

6.

Quiet

operation--almost

noiseless.

7.

No

external

electrical

effects

since

no

magnetic

field

is

generated.