Optical head and method of adjusting optical path thereof

A method of adjusting an optical path of an optical head, the method comprising:

• preparing the optical head to include a substrate, a laser diode that is installed on the substrate and emits light, a photodetector that is installed on the substrate and receives the light, an objective lens that is installed on a first side of the substrate and focuses the light emitted from the laser diode onto a recording surface of a disc, a prism that is installed on a second side of the substrate, transmits the light emitted from the laser diode toward the objective lens, and transmits the light reflected from the recording surface toward the photodetector, and an optical element that adjusts first and second optical path formed between the substrate and the prism.
• adjusting the first optical path through which the light is transmitted to the recording surface of the disc, by moving a first assembly body including the substrate and first optical elements assembled on the first side of the substrate relative to a second assembly body including second optical elements assembled on the second side of the substrate;
• and
• adjusting the second optical path through which the light is received from the recording surface of the disc, by adjusting a position of the hologram and quarter wave plate with respect to the first assembly body.

An optical head comprising:

• a substrate mounted with a laser diode and a photodetector;
• a first assembly body disposed on a first side of the substrate, and having an objective lens;
• and
• a second assembly body disposed on a second side of the substrate, and having a prism.

An optical head comprising:

• a substrate mounted with a laser diode and a photodetector;
• a first assembly body disposed on a first side of the substrate, and having an objective lens movably mounted on the first side of the substrate to adjust a first optical path from the laser diode to an outside of the objective lens;
• and
• a second assembly body having a prism and a hologram element disposed on a second side of the substrate to adjust a second optical path from the objective lens to the photodetector.

An optical head comprising:

• a substrate mounted with a laser diode and a photodetector;
• a first assembly body disposed on a first side of the substrate, and having an objective lens movably mounted on the first side of the substrate;
• and
• a second assembly body having a prism and a hologram element disposed on a second side of the substrate,
• wherein first and second optical paths are formed between the objective lens and the laser diode and the photodetector, respectively, in first and second U-shaped optical paths, respectively.

A method of adjusting first and second optical paths in an optical head, the method comprising:

• depositing a first assembly body having an objective lens on a first side of a substrate mounted with a laser diode and a photodetector;
• depositing a second assembly body having a prism on a second side of the substrate;
• depositing a hologram element between the second side of the substrate and the prism;
• moving the first assembly body to adjust the first optical path from the laser diode to an outside of the objective lens;
• and
• moving the hologram element to adjust the second optical path from the objective lens to the photodetector.

A method of adjusting first and second optical paths in an optical head, the method comprising:

• depositing first assembly body having an objective lens on a first side of a substrate mounted with a laser diode and a photodetector;
• depositing a second assembly body having a prism on a second side of the substrate;
• depositing a hologram element to be disposed between the second side of the substrate and the prism;
• and
• moving the hologram element to adjust the second optical path from the objective lens to the photodetector without adjusting the first optical path from the laser diode to an outside of the objective lens.

An optical head having an objective lens, a laser diode, and a photodetector, comprising:

• a unit having a hologram element and a quarter wave plate, and disposed between the objective lens and the laser diode and the photodetector;
• a first optical path on which light generated from the laser diode is transmitted to the objective lens through the unit;
• and
• a second optical path on which the light is transmitted to the photodetector through the unit,
• wherein the unit is moved with respect to the objective lens, the laser diode, and the photodetector to independently adjust the second optical path without interference between the first and second optical paths.

A method in an optical head having an objective lens, a laser diode, and a photodetector, comprising:

• depositing a unit having a hologram element and a quarter wave plate between the objective lens and the laser diode and the photodetector;
• forming a first optical path on which light generated from the laser diode is transmitted to the objective lens through the unit;
• forming a second optical path on which the light is transmitted to the photodetector through the unit;
• and
• adjusting the unit with respect to the objective lens, the laser diode, and the photodetector 170 to independently adjust the second optical path without interference between the first and second optical paths.