Optical: systems and elements – Image stabilization – By movable refractive structure
Reexamination Certificate
1999-05-27
2001-10-23
Nguyen, Thong (Department: 2872)
Optical: systems and elements
Image stabilization
By movable refractive structure
C359S554000, C359S831000, C396S052000, C396S055000
Reexamination Certificate
active
06307678
ABSTRACT:
This application is based on application No. 10-162825 filed in Japan, the contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an image shake correction device for correcting the image shake on the image focal plane of an optical apparatus due to vibration of an optical apparatus such as a camera, and an optical apparatus provided with the image shake correction device.
2. Description of the Prior Art
Heretofore, in the camera industry field, a correction optical system which drives a correction lens, which is located behind the photographic lens, eccentrically in a plane perpendicular to the optical axis has been known as a means for correcting the image shake on the image forming plane due to camera vibration caused during photographic activity. In the lens device provided with a correction optical system, an actuator used exclusively for driving the correction lens in a predetermined direction is incorporated, the movement of a camera is detected by means of a camera shake sensor such as an angular acceleration sensor, and the correction lens is driven based on the detected signal.
The piezoelectric actuator has been proposed which utilizes a phenomenon that a driven member coupled frictionally with a driving shaft moves in a predetermined direction with repeated reciprocal vibration when the driving shaft is vibrated reciprocally in different speed by a piezoelectric transducer which is serves as the actuator for driving such a correction optical system. This structure can drive eccentrically the correction lens having a holder frame coupled with the driven member of the piezoelectric actuator in a plane perpendicular to the optical axis (refer to Japanese Laid Open Patent No. Hei 8-43872 as an example).
Also, the prior art recognises a moving coil type of actuator which has two electromagnetic coils in a plane perpendicular to the optical axis provided on a holder frame of a correction lens and has a yoke and a permanent magnet located correspondingly to the two electromagnetic coils provided on a fixed frame of a lens barrel.
The above-mentioned piezoelectric actuator and moving coil type actuator are suitable for the correction lens driving mechanism for correcting image shake because of excellent controllability, however, these driving mechanisms are large and heavy to result in a large-sized and expensive optical apparatus as a whole, therefore a compact and light-weight correction lens driving mechanism has been desired to be realized.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a novel image shake correction device for correcting image shake on the focal plane of an optical apparatus caused by vibration of the optical apparatus and to provide an optical system having the image shake correction device.
It is another object of the present invention to provide a compact and light-weight image correction device having a driving mechanism which utilizes a shape memory alloy as the driving mechanism for driving an image shake correction optical element located in the optical path of the principal optical system of the optical apparatus and to provide an optical system having the image shake correction device.
It is yet another object of the present invention to provide a method for correcting image shake by heating a shape memory alloy of the driving mechanism, which is employed as the driving mechanism for driving an image shake correction optical element located in the optical path of the principal optical system of an optical apparatus.
It is still another object of the present invention to provide an optical apparatus having an image shake correction device applying said method for correcting image shake.
Other objects of the present invention will be clear from the detailed description of the present invention with reference to the attached drawings.
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Hara Yoshihiro
Kosaka Akira
Minato Shoichi
Tanaka Yoshiharu
Tanii Junichi
Minolta Co. , Ltd.
Morrison & Foerster / LLP
Nguyen Thong
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