Canon EOS EOS 7, Service Manual

Page: 82 / 271

1.6 B
UILT
-
IN
F
LASH
In the Full Auto and Programmed Image Control modes, the
built-in flash's automatic pop-up movement (retraction is
done manually) is driven by the M2 motor. In Creative Zone
modes, manual pop-up is required. Other features such as
3-zone TTL autoflash control and red-eye reduction are
based on the EOS 300/Rebel 2000/EOS Kiss III.
1.7 O
VERALL
O
PERATION
(1) Overall operation and basic sequence
Figure 2-19 shows the basic time chart, and Fig. 2-20 shows the basic sequence.
(2) Shutter release mechanism
The EOS ELAN 7 E / EOS 30’s shutter
release mechanism has a switch with two
click stops. At the first click stop (SW-1
ON), Eye Control, metering, and
autofocusing are activated. At the second
click stop (SW-2 ON), the shutter is
released to take the picture.
(3) Mirror-driving mechanism
To attain a continuous shooting speed of 4 fps, the EOS ELAN 7 E / EOS 30 features
improvements in the mirror-driving system as described below.
The EOS ELAN II E / EOS 50 E's mirror-driving system uses a spring for the mirror's
up movement and a cam for the down movement. Although this makes the mirror-up
time stable, the shutter-cocking load and mirror-up spring's cocking load occur at
the same time. This does not allow the gear ratio to be made small, and the power
consumption and time loss are large. To resolve this problem, the EOS ELAN 7 E /
EOS 30 uses a cam to move the mirror up and a spring to bring it back down. It uses
the same system as the EOS A2/A2E/5 where the mirror- and shutter-driving lever
and cam gear are driven independently. The load during the mirror's up movement
and the shutter cocking is thereby dispersed and the power current consumed is
reduced. The result is faster continuous shooting.
Also, since a mirror-dedicated cam is used to drive the mirror, the viewfinder
blackout time is shortened at the same time.
Part 2: Technical Information
2-15
Reflector
ST up/down spring
ST up lever
Pop-up
control switch
ST cam gear
ST up gear
ST switch cam
Absorption spring
Fig. 2-18 Built-in Flash Operation
Mechanism
Table 2-6 Built-in Flash Pop-up/Down Operation
Mode
Creative
Zone
Creative Zone
Full Auto &
PIC
Start of Recycling
1
After manual pop-up.
2
After the flash fires.
1
After the picture-taking mode is set.
2
At SW-1 ON.
3
After the flash fires.
Pop-Up
Manual
Automatic pop-up for low light or
fill flash after flash is ready and
AF and metering are executed.
Down
Manually
Condition
Shutter button up stroke
Normal position to SW-1 ON
SW-1 ON to SW-2 ON
Leeway beyond SW-2 ON
Stroke
0.0mm
0.7mm
0.2mm
0.2mm
Pressure
—
140g
330g
—
Table 2-7 Shutter Release Stroke and Pressure