Magneto-optical head device having integrated auxiliary lens and magnetic reproducing head and recording and reproducing device using magneto-optical head device

A reproducing device comprising:

• a spindle motor rotating a recording medium;
• a magneto-optical head device reading information recorded on said recording medium and
• a demodulation unit demodulating the information read by said magneto-optical head device,
• said magneto-optical head device including:
• a light source;
• an objective lens condensing a light beam emitted from said light source;
• an auxiliary lens converting an effective numerical aperture of the light beam condensed by said objective lens to irradiate said recording medium with the light beam;
• and
• a magnetic reproducing head integrated into said auxiliary lens, wherein when the light beam in said auxiliary lens has an angular aperture of 2θ, a surface of said auxiliary lens at which said magnetic reproducing head is formed is fabricated to be angled at θ or more relative to an optical axis of said auxiliary lens.

A recording and reproducing device comprising:

• a spindle motor rotating a recording medium;
• a magneto-optical head device reading information recorded on said recording medium and writing information on said recording medium;
• and
• a modulation and demodulation unit demodulating information read by said magneto-optical head device and modulating information to be written on said recording medium,
• said magneto-optical head device including:
• a light source;
• an objective lens condensing a light beam emitted from said light source;
• an auxiliary lens converting an effective numerical aperture of the light beam condensed by said objective lens to irradiate said recording medium with the light beam;
• a magnetic reproducing head integrated into said auxiliary lens;
• and
• a magnetic recording head integrated into said auxiliary lens, wherein when the light beam in said auxiliary lens has an angular aperture of 2θ, a surface of said auxiliary lens at which said magnetic reproducing head is formed is fabricated to be angled at θ or more relative to an optical axis of said auxiliary lens.