Patent ID: 7787718

Claim:
A suspension board with circuit comprising: a metal supporting board including a board trench portion; an insulating base layer formed on a surface of the metal supporting board; a conductive pattern formed on a surface of the insulating base layer; and an optical waveguide provided to overlap the board trench portion when projected in a thickness direction of the metal supporting board, wherein at least a part of the optical waveguide is positioned closer to the conductive pattern than to a back surface of the metal supporting board, a magnetic-head-side opening is formed on a head-slider mounting portion for mounting a head slider provided with a magnetic head, the magnetic-head-side opening extending through the metal supporting board and the insulating base layer in the thickness direction thereof, a light-emitting-element-side opening is formed on a light-emitting-element mounting portion for mounting a light emitting element, the light-emitting-element-side opening extending through the metal supporting board and the insulating base layer in the thickness direction thereof, the board trench portion and the optical waveguide are continuously provided between the magnetic-head-side opening and the light-emitting-element-side opening, a magnetic-head-side end surface as a front end surface of the optical waveguide is disposed so as to face the magnetic-head-side opening, while a light-emitting-element-side end surface as a rear end surface thereof is disposed so as to face the light-emitting-element-side opening, the light-emitting-element-side end surface is formed as an inclined surface that crosses the longitudinal direction of the optical waveguide at a predetermined angle, the magnetic-head-side end surface is formed as an inclined surface that crosses the longitudinal direction of the optical waveguide at a predetermined angle, and light emitted from the light emitting element passes through the light-emitting-element-side opening to have an optical path thereof changed at a predetermined angle by the light-emitting-element-side end surface and is then incident on the optical waveguide, and light emitted from the optical waveguide has an optical path thereof changed at a predetermined angle by the magnetic-head-side end surface and is then emitted toward the magnetic-head-side opening.