Light emitting module and compatible optical pickup device adopting the same

A light emitting module, comprising:

• a base;
• a heat sink positioned on said base, with said heat sink providing a lateral surface and a top surface;
• first and second light sources installed on the base to emit laser beams in different wavelength regions, with the first and second light sources respectively mounted on said lateral surface and on said top surface;
• a beam splitter positioned between said first and second light sources, dividing the beams emitted from the first and second light sources;
• and
• a photodetector monitoring the optical outputs of the first and second light sources by receiving the beams emitted from the first and second light sources and split from the beam splitter in one direction.

A compatible optical pickup device, comprising:

• a light emitting module having a base, first and second light sources installed on the base, to emit laser beams in different wavelength regions, a beam splitter dividing the beams emitted from the first and second light sources, and a photodetector monitoring the optical outputs of the first and second light sources by receiving the beams emitted from the first and second light sources and split from the beam splitter in one direction;
• a heat sink positioned on the base, with the first and second light sources mounted on a lateral surface of and on a top surface of the heat sink;
• an objective lens disposed on the optical path between the light emitting module and an optical recording medium, for focusing the beams emitted from the first and second light sources onto the optical recording medium;
• an optical path converting device disposed on the optical path between the light emitting module and the objective lens, converting the proceeding path of an incident beam;
• and
• a photodetector receiving the beams emitted from the first and second light sources, reflected from the optical recording medium and input via the optical path converting device.

A light emitting module, comprising:

• a substrate;
• a first light source, installed on the substrate, for emitting a laser beam of a wavelength from both lateral sides thereof;
• a second light source, installed on the substrate being separated by a predetermined distance from the first light source, emitting a laser beam of a wavelength different from that of the laser beam emitted from the first light source from both lateral sides thereof;
• a reflection member, arranged on the substrate between the first light source and the second light source, reflecting the laser beam emitted from one lateral side of each of the first and second light sources to proceed in one direction;
• first and second monitoring photodetectors receiving the laser beam emitted from the other lateral side of each of the first and second light sources and monitoring optical outputs of the first and second light sources;
• a package frame encompassing the substrate, the first and second light sources, the reflection member and the first and second photodetectors;
• and
• a lead frame formed by penetrating the package frame and wire-bonded to the first and second light sources and the first and second monitoring photodetectors.

A compatible optical pickup device, comprising:

• a light emitting module including a substrate, first and second light sources installed on the substrate emitting laser beams of first and second wavelengths from both lateral sides thereof, a reflection member arranged on the substrate between the first and second light sources reflecting the laser beam emitted from one lateral side of each of the first and second light sources to proceed in one direction, and first and second monitoring photodetectors receiving the laser beam emitted from the other lateral side of each of the first and second light sources and monitoring optical outputs of the first and second light sources;
• an objective lens arranged on an optical path between the light emitting module and an optical recording medium focusing the incident first and second laser beams on the optical recording medium;
• an optical path converting device arranged on an optical path between the light emitting module and the objective lens converting a proceeding path of an incident light;
• a grating arranged on an optical path between the light emitting module and the optical path converting device diffracting and transmitting an incident light;
• a photodetector receiving an incident light emitted from the first and second light sources and reflected by the optical recording medium and passing the optical path converting device;
• and
• a holographic device arranged on an optical path between the optical path converting device and the optical output device diffracting and transmitting an incident light.

A light emitting process, comprising:

• providing a base providing a lateral surface and a top surface within a module;
• installing first and second light sources on the base to emit laser beams exhibiting different wavelengths, with the first and second light sources respectively mounted on said lateral surface and on said top surface;
• positioning a beam splitter between said first and second light sources, to divide the beams emitted from the first and second light sources;
• and
• monitoring the optical outputs of the first and second light sources by positioning a photodetector within said module to receive the beams emitted from the first and second light sources and split from the beam splitter onto said photodetector.

A light emitting process, comprising:

• assembling a light emitting module comprised of a substrate, first and second light sources installed on the substrate to selectively emit laser beams of first and second wavelengths from both lateral sides thereof, a reflection member arranged on the substrate between the first and second light sources to reflect the laser beam emitted from one lateral side of each of the first and second light sources to proceed in one direction, and at least one photodetector positioned within the module to receive the laser beam emitted from the other lateral side of at least one of the first and second light sources;
• arranging an objective lens on an optical path between the light emitting module and an optical recording medium to focus incident first and second laser beams on the optical recording medium;
• and
• detecting error occurring along said optical path.