Pioneer Corporation

Mitsutoshi Sugano

Shinichi Takahashi

Ko Ishii

Makoto Kawamura

Akira Miura

Masayuki Koyama

Hirokatsu Nagatake

Aki Yoshioka

Takehiro Motegi

Yoshihiro Seita

An optical pickup apparatus and a laser diode chip which can simplify and miniaturize a construction of the apparatus is provided for using a plurality of laser beams of different wavelengths. The laser diode chip is a chip for the optical pickup apparatus in which a plurality of light emitting portions for emitting the laser beams of the different wavelengths in the same emitting direction are formed on a substrate. Light emitting points of the plurality of light emitting portions are located at positions which are different in the emitting direction.

Optical pickup apparatus and laser diode chip

A reflective mirror is inclined and placed with respect to an objective lens and a photoelectric conversion element for monitor is placed in the back side of the reflective mirror . The reflective mirror is formed into a structure in which a semi-transmission film HM having predetermined reflectance and transmittance is formed on one surface of a substrate of a transparent medium. When a laser beam for information record or information reproduction is launched from semiconductor lasers to the reflective mirror , the semi-transmission film HM splits the laser beam into a reflected beam and a transmitted beam and the reflected beam is emitted to the side of the objective lens and the transmitted beam is emitted to the side of the photoelectric conversion element . As a result of this, any laser beams for the information record and the information reproduction can be detected by one photoelectric conversion element to perform APC control of the semiconductor lasers and the intensity of the laser beam for the information record and the information reproduction with respect to an information record medium can be controlled properly.

Optical pickup apparatus

Laser beams h , h with different wavelengths emitted from semiconductor lasers are incident to an optical path joint prism and each of optical intensities of the laser beams h , h is detected by a photoelectric conversion element provided in an optical path integrated by the optical path joint prism on which a semi-transmission film HM is provided and APC control of each of light emission intensities of the semiconductor lasers is performed on a basis of each of detection results. As a result of this, the beam intensity of the laser beam h passing through the optical path joint prism to be applied to an information recording medium and the laser beam h reflecting the optical path joint prism to be applied to the information recording medium are controlled properly.

An optical pickup apparatus which supports two wavelengths and is amenable to a reduction in size without employing a combining prism. The optical pickup apparatus employs a semiconductor laser device implemented in the form of a one-chip laser diode having two light sources for emitting a first laser beam and a second laser beam at a wavelength different from that of the first laser beam. A photodetector unit has a first detector section for receiving the first laser beam and a second detector section for receiving the second laser beam, and is set at positions at which the first and second laser beams follow return light paths of different lengths from an optical disc to the first and second detector sections.

Optical pickup apparatus for reading different types of recording media at different reading wavelengths

An optical pickup apparatus capable of reading information from recording media of different read wavelengths, includes a light-emitter having a first light source for emitting a first laser beam integrated with a second light source for emitting a second laser beam of a different wavelength from that of the first laser beam. The optical pickup apparatus includes a photodetector for receiving a beam reflected by each of the recording media and an optical system having a plurality of optical elements which form an optical path to guide the first and second laser beams to the recording media and which form an optical path for guiding the reflected beam to the photodetector and through which the first and second laser beams pass.

An optical pickup apparatus includes a semiconductor laser device having a plurality of light emitting portions for emitting laser beams having different wavelengths on a substrate for emitting a laser beam from one of the plurality of light emitting portions in response to a light emitter selecting instruction in the same emitting direction. The laser beam emitted from the semiconductor laser device is converged by an objective lens and led to a recording surface of an optical disk, and the objective lens is moved to one of a plurality of different positions in a radial direction of the optical disk, corresponding to the selected light emitting portion.

Growing community of inventors

Tokorozawa, Japan

Mitsutoshi Sugano