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14
2-3. New SteadyShot Function (Active Lens System)
Operating Principle
A part of the inner lens is attached to the movable frame as shown in Fig. 2-3-1.
The movable frame has the structure that a coil is wound around the other part
of the movable frame. When the inner lens is shaken, a current flows through
the coil whereas the coil can be moved as it is coupled with the magnet of the
opposite pole. Amount of shaking (movement) is detected as a part of the mov-
able frame moves inside the photo-interrupter (between IRED and PSD).
Features
(1) The optical system can be made compact.
(Compared with the active prism system)
(2) There is no deterioration of picture quality.
(Compared with the active image area system)
Fig. 2-3-1
Fig. 2-3-1
Fig. 2-3-3
PSD
Shift unit
Fixed frame
IRED
Sdrive_h
Spsd_h
Spsd_v
Sdrive_v
IRED
PSD
Horizontal
direction position
detection circuit
direction position
detection circuit
Vertical
direction position
detection circuit
direction position
detection circuit
Guide plate to prevent
the lens system
from rolling
the lens system
from rolling
Eccentric pin
Movable frame
Subject side
CCD side
Yoke
Magnet
Coil
Yoke
Slit
IRED
PSD
Horizontal
direction
drive coil
direction
drive coil
Vertical
direction
drive coil
direction
drive coil
Shift lens
Shift lens
Shift unit
Lens unit
CCD
Position of the shift lens after it is moved
Direction of movement of the shift lens
Subject side
Other lens group
Other lens group
Shaking of image
Corrected image
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