Focus servo pull-in apparatus for use in a compatible disk player

A focus servo pull-in apparatus for performing focus servo pull-in control at a time of reproducing information from one of at least two types of recording media with different distances from surfaces of said recording media to information recording planes where information is recorded, said apparatus comprising:

• a light-emitter irradiating a light beam on an information recording plane of a recording medium in use;
• a light-receiver receiving reflected light of said light beam from said information recording surface;
• a focus driver moving an objective lens for focusing said light beam, in a direction parallel to an optical axis of said light beam;
• a discriminator discriminating a type of said recording medium in use and outputting a discrimination signal;
• and
• a controller controlling said focus driver in such a manner as to set a start position of a pull-in control operation at one of a plurality of positions in accordance with said discrimination signal.

A focus servo pull-in apparatus for performing focus servo pull-in control at a time of reproducing information from a recording medium having a plurality of information recording planes where information is recorded, said apparatus comprising:

• light-emitting means for irradiating a light beam on one of said information recording surfaces;
• light-receiving means for receiving reflected light of said light beam from one of said information recording surfaces;
• moving means for moving an objective lens for directing said light beam to a focus, in a direction parallel to an optical axis of said light beam;
• and
• control means for controlling said moving means in such a manner as to set a start position of a pull-in control operation at one of a plurality of positions in accordance with an information recording surface to be accessed for reproduction.

A focus servo pull-in apparatus for performing focus servo pull-in control at a time of reproducing information from one of at least two types of recording media with different distances from surfaces of said recording media to information recording planes where information is recorded, said apparatus comprising:

• light-emitting means for irradiating a light beam on an information recording plane of a recording medium in use;
• light-receiving means for receiving reflected light of said light beam from said information recording surface;
• moving means for moving an objective lens for focusing said light beam, in a direction parallel to an optical axis of said light beam;
• discrimination means for discriminating a type of said recording medium in use and outputting a discrimination signal;
• and
• control means for controlling said moving means in such a manner as to set a start position of a pull-in control operation at one of a plurality of a positions in accordance with said discrimination signal.