Patent ID: 8081552

Claim:
A hologram disc reading and writing apparatus for reading and writing data on a hologram disc, the hologram disc reading and writing apparatus comprising: a signal light source module adapted for emitting a signal light beam to a data region of the hologram disc when writing data, the signal light beam having a first polarization direction; a beam splitter disposed on a transmission path of the signal light beam and located between the signal light source module and the data region, the beam splitter being adapted for transmitting the signal light beam to the data region; a reference/reading light source located at one side of the hologram disc where the signal light source module is located, the reference/reading light source being adapted for emitting a spherical wave light beam having the first polarization direction to the data region when writing data so as to write data onto the data region through the signal light beam and the spherical wave light beam, the reference/reading light source being adapted for emitting the spherical wave light beam to the data region when reading data, the spherical wave light beam passing through the data region; a reflector located at the other side of the hologram disc opposite to the one side of the hologram disc where the signal light source module is located, the reflector being adapted for reflecting the spherical wave light beam to form a phase conjugate light beam conjugating with the spherical wave light beam and transmitted to the data region, the phase conjugate light beam being transmitted through the data region and then transformed to a data light beam transmitted to the beam splitter; and an optical reading head located on the one side of the hologram disc where the reference/reading light source is located, the beam splitter being adapted for transmitting the data light beam to the optical reading head.