Patent ID: 7319644

Claim:
A recording and/or reproducing apparatus for an optical recording medium comprising: means for rotationally driving an optical recording medium; an optical head for illuminating light via an objective lens supported for movement relative to a rotating optical recording medium and for detecting a light beam reflected from a signal recording surface of said optical recording medium through said objective lens by light detecting means; a signal processing circuit for generating playback signals based on detection signals from said light detecting means; and a servo circuit for causing movement of said objective lens based on said detection signals from said light detecting means; said optical head including: an objective lens supported for movement; a light source for radiating a light beam; light separating means for separating the light beam radiated from said light source and a reflected light beam from an optical recording medium from each other; light detecting means for receiving said reflected light beam from said optical recording medium separated by said light separating means; and spot shape correction means arranged between said objective lens and said light detecting means; said spot shape correction means correcting part or all of spots formed by said reflected light beam on said light detecting means so that the spot diameter in a direction of traversing a track on said optical recording medium will be larger than the spot diameter in a direction along said track, wherein said spot shape correction means includes a cylindrical lens.