Optical pickup and high-frequency superposition module therefor
AssigneeTDK Corporation
InventorMasamichi Tanaka
Life of this patent
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Abstract
A high-frequency super position module for an optical pickup that reduces the number of devices, facilitates scale-down and allows an oscillating circuit to be turned off when a power supply for feeding a direct current to a laser diode is turned off and an optical pickup using the high-frequency superposition module. An oscillating circuit for feeding a high frequency to a laser diode comprises at least an active element and passive elements such as capacitors, resistors, and inductors. A power supply for feeding a direct current to the laser diode is also used as a power supply for the oscillating circuit.
Claims3
A high-frequency superposition module for an optical pickup that superposes a high-frequency current on a direct current of a laser diode for the optical pickup, said module comprising:
- an oscillating circuit for feeding said high frequency to said laser diode, which includes at least an active element and passive elements;
- and
- a power supply for feeding said direct current to the laser diode which is also used as a power supply for said oscillating circuit.
An optical pickup comprising:
- a laser diode;
- and
- a high-frequency superposition module that superposes a high-frequency current on a direct current of a laser diode, said module including:
- an oscillating circuit for feeding said high frequency to said laser diode, which includes at least an active element and passive elements;
- and
- a power supply for feeding said direct current to the laser diode which is also used as a power supply for said oscillating circuit,
- wherein said laser diode is driven by said high-frequency superposition module
Dependencies are inferred from the claim text.