OPTICAL HEAD AND OPTICAL DISK DEVICE

摘要

An optical head is disclosed which comprises first and second light sources which are arranged next to each other and emit lights of different wavelengths and an optical device which is arranged between the first and second light sources and a collective lens for reducing the spherical aberration caused by combination of the collective lens and at least one of first and second optical recording media which correspond to at least one of the lights of first and second wavelengths. The optical axis of the optical device is shifted with respect to the optical axis of the collective lens in order to reduce the coma aberration that is caused since at least one of optical axes of the lights of first and second wavelengths does not coincide with the optical axis of the collective lens.