Optical disc player capable of reproducing a plurality of different types of optical discs

In an optical disc player including

• a first light source which emits a luminous flux of a first wavelength for reproducing a first optical disc,
• a second light source which emits a luminous flux of a second wavelength shorter than the first wavelength for reproducing a second optical disc having a recording density higher than that of the first optical disc,
• lens means for focusing the luminous fluxes of the first and second wavelengths onto the optical discs, and
• photodiodes for receiving reflected lights from the first and second optical discs,
• the improvement characterized by further including
• means for discriminating between the first optical disc and the second optical disc,
• wherein the means for discriminating discriminates between the first optical disc and the second optical disc by first trying to reproduce an optical disc by the first light source and determining whether the optical disc being reproduced is the first optical disc or the second optical based on a result of trying to reproduce the optical disc by the first light source.

An optical disc player capable of reproducing a first type of optical disc and a second type of optical disc having a recording density higher than a recording density of the first type of optical disc, the optical disc player comprising:

• a first light source which emits light having a first wavelength for reproducing the first type of optical disc;
• a second light source which emits light having a second wavelength shorter than the first wavelength for reproducing the second type of optical disc;
• focusing means for focusing the light having the first wavelength and the light having the second wavelength on an optical disc;
• light receiving means for receiving reflected light having the first wavelength and reflected light having the second wavelength from the optical disc;
• and
• discriminating means for discriminating whether the optical disc is the first type of optical disc or the second type of optical disc by
• first trying to reproduce the optical disc using the light having the first wavelength,
• if the optical disc is successfully reproduced using the light having first wavelength, identifying the optical disc as the first type of optical disc and continuing to reproduce the optical disc using the light having the first wavelength, and
• if the optical disc cannot be successfully reproduced using the light having first wavelength, identifying the optical disc as the second type of optical disc and reproducing the optical disc using the light having the second wavelength.

An optical disc player capable of reproducing a first type of optical disc and a second type of optical disc having a recording density higher than a recording density of the first type of optical disc, the optical disc player comprising:

• a first light source which emits light having a first wavelength for reproducing the first type of optical disc;
• a second light source which emits light having a second wavelength shorter than the first wavelength for reproducing the second type of optical disc;
• focusing means for focusing the light having the first wavelength and the light having the second wavelength on an optical disc;
• light receiving means for receiving reflected light having the first wavelength and reflected light having the second wavelength from the optical disc;
• and
• discriminating means for discriminating whether the optical disc is the first type of optical disc or the second type of optical disc by
• first trying to reproduce the optical disc using the light having the first wavelength, and
• discriminating whether the optical disc is the first type of optical disc or the second type of optical disc based on a result of trying to reproduce the optical disc using the light having the first wavelength.