초록

An optical disc drive apparatus includes a laser device for generating a light beam for optically reading data from a disc. The laser device is electrically incorporated in a resonant circuit which includes an inductance coupled to the laser device.

대표청구항 ▼

The invention claimed is: 1. An optical disc drive apparatus, comprising a laser device for generating a light beam for optically reading data from a disc, said laser device being incorporated in an LC oscillator circuit, with a parasitic capacitance of said laser resonating with an inductor to for

The invention claimed is: 1. An optical disc drive apparatus, comprising a laser device for generating a light beam for optically reading data from a disc, said laser device being incorporated in an LC oscillator circuit, with a parasitic capacitance of said laser resonating with an inductor to form a resonant LC circuit of said LC oscillator circuit, so that electrical energy can be exchanged in a resonant manner between the inductor and the parasitic capacitance back and forth, wherein an inverter is coupled in parallel to the inductor. 2. The optical disc drive apparatus according to claim 1, wherein said LC oscillator circuit comprises a current path in which said laser device and an inductance are coupled in a series arrangement. 3. The optical disc drive apparatus according to claim 1, wherein said LC oscillator circuit comprises at least one capacitance coupled in series with said laser device and said inductance. 4. A laser driver circuit for driving a semiconductor laser, having a first output terminal and a second output terminal for connection to an anode terminal and a cathode terminal, respectively, of a laser to be driven; the laser driver circuit comprising an inductance having at least one terminal coupled to at least one of said output terminals, and a parasitic capacitance of said laser resonating with said inductance to form a resonant LC circuit of an LC oscillator circuit, so that electrical energy can be exchanged in a resonant manner between said inductance and the parasitic capacitance back and forth, wherein an inverter is coupled in parallel to said inductance. 5. The laser driver circuit according to claim 4, further comprising at least one capacitance coupled between said inductance and said first or second output terminal, respectively. 6. The laser driver circuit according to claim 4, wherein said inductance has one terminal coupled to said first output terminal and has another terminal coupled to said second output terminal. 7. The laser driver circuit according to claim 4, further comprising a diode coupled between one of said output terminals and a voltage reference. 8. The laser driver circuit according to claim 7, wherein said diode comprises a controllable switch controlled by a signal derived from a voltage occurring at a location in a current path defined by said inductance and said output terminals, said location corresponding to one terminal or a tap of said inductance. 9. The laser driver circuit according to claim 4, comprising an output stage implemented as an oscillator coupled to at least one of said output terminals. 10. A light beam generating device, comprising a semiconductor laser driven by laser driver circuit according to claim 4. 11. An optical disc drive apparatus, comprising a laser driver circuit according to claim 4. 12. The optical disc drive apparatus of claim 1, wherein the inductor and capacitor are connected in parallel. 13. The laser driver circuit of claim 4, wherein said inductance and said parasitic capacitor are connected in parallel. 14. The laser driver circuit of claim 4, further comprising: a first capacitor connected between a first terminal of said inductance and the anode terminal; and a second capacitor connected between a second terminal of the inductor and the cathode terminal. 15. The laser driver circuit of claim 14, further comprising a switch connected between the anode terminal and a reference voltage source. 16. The laser driver circuit of claim 15, wherein the switch is a bootstrap diode. 17. The laser driver circuit of claim 15, wherein the switch is a transistor.