Minolta 7000 - Page 14

(3)
Phase
difference
detection
system
Interval of both images
when in-focus
©
Infocus
—
Film plane |
@)
Out
of
focus
(near
focus}
@
Out
of
focus
(far
focus)
@ In-focus
After
light
from
taking
lens
is
focused
on
specified
position
which
corresponds
to
actual
film
plane.
Light
is
separated
into
two
images
and
formed
on
CCD
image
sensor
by
separating-lens.
@ Out of focus (near focus)
In
case
that
light
is
focused
on
front
side
of
specified
position,
space
in
between
2
images
becomes
narrower than that of in-focus.
@ Out of focus (far focus)
In
case
that
light
is
focused
on
rear
side
of
specified
position,
space
in
between
2
images
becomes
wider than that of in-focus.
Comparison
biock
is
composed
with
more
picture
elements
than
that
of
reference
block.
AF
circuit
detects
phase
difference
while
shifting
image
on
comparison
block
one
by
one,
comparing
image
on
reference
block.
Since
space
in
between
2
images
at
in-focus
is
specified,
in-focus
position
and
defocus
amount
can
be
calculated
by
image
data
on
refernce
block
and
comparison
block.