Sharp Kabushiki Kaisha Corporation

Takashi Itoh

Kazunori Matsubara

Shigehiro Yamada

Nobumasa Kaneko

An optical pick-up apparatus and a semiconductor laser apparatus which can suppress reduction of optical utilization efficiency for the laser light emitted from the semiconductor laser element. When a laser light which is emitted from a laser element for DVD and whose polarization direction is perpendicular to a direction of a groove of the polarization grating is incident on the polarization grating, the polarization grating does not diffract the laser light and transmits the laser light as zero-order diffraction light. Consequently, all of the laser light emitted from the laser element for DVD can be used for reading information signal of DVD and detecting FES and TES. This enables reduction of optical utilization efficiency arising by diffracting action of a grating used for detecting TES of CD in a conventional optical pick-up apparatus to be suppressed.

Optical pick-up apparatus and semiconductor laser apparatus

A semiconductor laser device comprises a semiconductor laser chip, a first member which has one surface substantially perpendicular to a direction of an emission laser beam and has a concave having a bottom face substantially parallel to the one surface, and a second member inserted into the concave and joined to the first member. The semiconductor laser chip is disposed to the bottom face of the concave of the first member. The second member is inserted and joined into the concave of the first member so as to cover the semiconductor laser chip. Consequently, it is avoided to impair smoothness of the one surface of the first member, so that it is possible to precisely join the first and second members after being joined together to a desired apparatus at the one surface.

Growing community of inventors

Nara, Japan

Takashi Itoh