Last Updated：2025/11/29
An adjustable diaphragm by which the diameter of an approximately circular opening may be controlled, as for regulating the aperture of a lens; it consists of a number of movable thin curved plates fastened at regular intervals around the inside of a ring, the positions of which are simultaneously adjusted by a single knob on the outside of the lens. It is used in cameras and microscopes.
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iris diaphragm
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Source Word
iris diaphragm
Noun
An
adjustable
diaphragm
by
which
the
diameter
of
an
approximately
circular
opening
may
be
controlled,
as
for
regulating
the
aperture
of
a
lens;
it
consists
of
a
number
of
movable
thin
curved
plates
fastened
at
regular
intervals
around
the
inside
of
a
ring,
the
positions
of
which
are
simultaneously
adjusted
by
a
single
knob
on
the
outside
of
the
lens.
It
is
used
in
cameras
and
microscopes.
Japanese Meaning
虹彩絞り：カメラや顕微鏡などの光学機器で使用される、円形の開口部の直径を調節するために用いられる調節可能な絞り機構。薄い曲線状のプレートがリングの内側に等間隔に固定され、外側のノブ一つで同時に位置が調整される。
Sense（1）
An
adjustable
diaphragm
by
which
the
diameter
of
an
approximately
circular
opening
may
be
controlled,
as
for
regulating
the
aperture
of
a
lens;
it
consists
of
a
number
of
movable
thin
curved
plates
fastened
at
regular
intervals
around
the
inside
of
a
ring,
the
positions
of
which
are
simultaneously
adjusted
by
a
single
knob
on
the
outside
of
the
lens.
It
is
used
in
cameras
and
microscopes.
（ plural ）
