Compatible optical pickup

A compatible optical system for use with recording and/or reproducing data with respect to a first optical medium having a first thickness, a second optical medium having a second thickness, and a third optical medium having a third thickness, the system comprising:

• a first optical unit which emits a first light beam for use with the first optical medium and detects the first light beam reflected from the first optical medium, and emits a second light beam other than the first light beam for use with the second optical medium and detects the second light beam reflected from the second optical medium;
• a first objective lens disposed in an optical pathway between the first optical unit and the received one of the first and second optical media and having an optical property which forms a light spot suitable for recording and/or reproducing data with respect to each of the first and second optical media;
• a second optical unit which emits a third light beam other than the first and second light beams for use with recording and/or reproducing data with respect to the third optical medium and which detects the third light beam reflected from the third optical medium;
• and
• a second objective lens disposed in an optical pathway between the second optical unit and which forms a light spot using the third light beam suitable for recording and/or reproducing data with respect to the third optical medium,
• wherein the first through third light beams having corresponding different wavelengths corresponding to the first through third thicknesses.

A compatible optical system for use with recording and/or reproducing data with respect to a first optical medium having a first thickness and a second optical medium having a second thickness, the system comprising:

• a first optical unit which emits a first light beam for use with the first optical medium and detects the first light beam reflected from the first optical medium;
• a first objective lens disposed in an optical pathway between the first optical unit and the received one of the first and second optical media and having an optical property which forms a light spot suitable for recording and/or reproducing data with respect to the first second optical medium;
• a second optical unit which emits a second light beam other than the first light beam for use with recording and/or reproducing data with respect to the second optical medium and which detects the second light beam reflected from the second optical medium;
• a second objective lens disposed in an optical pathway between the second optical unit and the received one of the first and second optical media and which forms a light spot using the second light beam suitable for recording and/or reproducing data with respect to the second optical medium;
• and
• a holding unit which disposes the first objective lens at a first working distance relative to the first recording medium, and disposes the second objective lens at a basic operating distance relative to the second recording medium which is greater than a second working distance through which the second objective lens is moved during recording and/or reproducing of the second optical medium so as to prevent the second objective lens from impacting the first recording medium during recording and/or reproduction of the first recording medium,
• wherein the first working distance is greater than the second working distance.