| 摘要 |
PURPOSE: A laser diode driving circuit and an optical head are provided to generate a better driving signal even though a pulse width of light emitted from a laser diode is narrow. CONSTITUTION: An optical head is faced with an optical recording disk(30). The optical head consists of the first laser unit(10), a flexible circuit board(3) connected to the first laser unit(10), an IC(4) for driving a laser diode mounted on the flexible circuit board(3), the second laser unit(20), and a substrate(8). The first laser unit(10) is composed of the first laser diode(11) for emitting a laser beam having the first wavelength, the first photo detector(12), and the first hologram(13). The photo detector(12) generates a reproduction signal, a focusing error signal, and a tracking error signal. The first hologram(13) passes the laser beam emitted from the laser diode(11), and diffracts a portion of a beam reflected from the disk(30) to induce the diffracted light to the first photo detector(12).
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