| 摘要 |
The invention achieves a vibration-proof optical system which is designed so that when a picture-taking lens vibrates or shakes, the resultant blurring of the image can be well compensated for rapidly and without incurring deterioration of the ability to form images, and which is small and simple in structure as well. A meniscus lens L convex on the image surface is located between principal lens systems G1 to G4 forming an object image and the image surface. The blurring of the image that occurs by the inclination of the entire picture-taking lens system is compensated for by the tilting of the meniscus lens L with respect to the optical axis. The image blur compensating lens L of such construction is of lens shape that enables decentration aberration coefficients to be reduced, so making it possible to inhibit the occurrence of a "point image blur" or an "image expansion and compression" and, hence, to keep the ability to form images in a good enough state even in the presence of an image blur. For this reason, an aberration variation due to the rotation of the image blur compensating optical system L is so reduced that the ability to form images can be kept in a good enough state even when the taking optical system moves unintentionally.
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