Microactuator for track positioning a slider-mounted lens of an optical disc drive

An optical disc drive having

• a rotatable optical recording medium having a recording surface having a plurality of concentric radial tracks along which data may be recorded as marks having distinctive optical characteristics and along which data may be recovered by optically sensing marks when the recording medium is rotated at an operating velocity;
• an optical system having
• a light source for supplying light,
• an objective lens for directing light supplied by the light source at the recording surface, the objective lens defining a focal point at a position relative to the lens, and
• a light detector operatively associated with the objective lens to receive light reflected from the recording surface;
• a slider supporting the objective lens;
• an actuator arm supporting the slider at a selected radial position adjacent the optical recording medium, the slider having an aerodynamic surface to fly a design distance from the recording surface when the recording medium is rotated at the operating velocity;
• and
• a microactuator on the slider operable to selectively alter the radial position of the focal point relative to the slider.