Patent ID: 6124986
Filing Date: 2000-09-26
Classification: G02B

Abstract:
A zoom optical system comprising:a first optical unit having a refractive power, said first optical unit having a reflecting surface;a second optical unit having a refractive power; anddriving means for moving an image pick-up surface which receives light from an object through said first optical unit and said second optical unit,wherein said zoom optical system performs variation of magnification by moving at least one of said first optical unit and said second optical unit, and a deviation of a focus position due to the variation of magnification is corrected by moving the image pick-up surface by said driving means, andwherein said first optical unit is provided with a plurality of surfaces,at least one of said plurality of surfaces being decentered with respect to other surfaces, andat least one of said Plurality of surfaces being an aspheric surface of rotational asymmetry.