Magneto-optical head and method of making coil for the same

A method of making a coil for a magneto-optical head comprising the steps of:

• forming a first conductive pattern on a transparent substrate;
• forming a first transparent insulating layer filling a center of the first conductive pattern;
• forming a second conductive pattern on the first insulating layer, the second conductive pattern being smaller in inner diameter than the first conductive pattern;
• and
• forming a second transparent insulating layer filling a center of the second conductive pattern;
• wherein the step of forming the second conductive pattern comprises the sub-steps of:
• forming on the first insulating layer a third transparent insulating layer provided with a hole;
• forming a fourth transparent insulating layer to cover the third insulating layer:
• etching the fourth insulating layer and a part of the first insulating layer via the hole of the third insulating layer, so that a second recess corresponding to the second conductive pattern is formed in the fourth insulating layer, and a through-hole communicating with the second recess is formed in the first and the third insulating layers;
• and
• supplying a conductive material for filling the second recess and the through-hole.

A magneto-optical head comprising:

• a slider held in facing relation to a storage medium;
• an objective lens supported by the slider for concentrating light rays;
• a coil provided with a center through which the light rays pass, the coil including a first conductive pattern and a second conductive pattern which is closer to the storage medium than the first conductive pattern is;
• and
• a transparent insulating layer enclosing the coil, the transparent insulating layer having an outer surface facing the storage medium;
• wherein the second conductive pattern is smaller in inner diameter than the first conductive pattern, the insulating layer filling the center of the coil;
• wherein the coil includes third and fourth conductive patterns arranged between the first and the second conductive patterns, the third and the fourth conductive patterns being smaller in inner diameter than the first conductive pattern but greater in inner diameter than the second conductive pattern;
• and
• wherein the coil is provided with a first connecting piece for connecting an inner end of the first conductive pattern to an inner end of the third conductive pattern, a second connecting piece for connecting an outer end of the third conductive pattern to an outer end of the fourth conductive pattern, and a third connecting piece for connecting an inner end of the fourth conductive pattern to an inner end of the second conductive pattern.