MDCP: Patent Abstact US05673247: Optical pickup having two objective lenses

US05673247 Optical pickup having two objective lenses

Assignee Sharp Corporation

Assign./Filed Sept. 30, 1997/ Nov. 27, 1996

Inventors Sekimoto; Yoshihiro, Nakata; Yasuo, Ogata; Nobuo, Miyake; Tomoyuki

Summary Double lens optical pickup. Good drawings of the optical path details.

Abstract An optical pickup for irradiating a first recording medium and a second recording medium with light, at least one of the substrate thickness and the refractive index of the first recording medium being different from that of the second recording medium, where the optical pickup includes: a light source for emitting the light; a polarized beam splitter for receiving the light and for transmitting at least a portion of the light while reflecting the remaining portion of the light depending on the polarization direction of the light; a first objective lens for focusing the portion of the light reflected by the polarized beam splitter onto the first recording medium; and a second objective lens for focusing the portion of the light transmitted through the polarized beam splitter onto the second recording medium.

US05673247	Optical pickup having two objective lenses
Assignee	Sharp Corporation
Assign./Filed	Sept. 30, 1997/ Nov. 27, 1996
Inventors	Sekimoto; Yoshihiro, Nakata; Yasuo, Ogata; Nobuo, Miyake; Tomoyuki
Summary	Double lens optical pickup. Good drawings of the optical path details.
Abstract	An optical pickup for irradiating a first recording medium and a second recording medium with light, at least one of the substrate thickness and the refractive index of the first recording medium being different from that of the second recording medium, where the optical pickup includes: a light source for emitting the light; a polarized beam splitter for receiving the light and for transmitting at least a portion of the light while reflecting the remaining portion of the light depending on the polarization direction of the light; a first objective lens for focusing the portion of the light reflected by the polarized beam splitter onto the first recording medium; and a second objective lens for focusing the portion of the light transmitted through the polarized beam splitter onto the second recording medium.