Patent ID: 8270278
Filing Date: 2012-09-18
Classification: G11B

Abstract:
1. An optical recording apparatus comprising: a focusing section that focuses to a transmission type recording medium a recording light beam including a signal light beam and a reference light beam which are radiated from a same direction with a common optical axis, the signal light beam including a light and dark pattern representing digital data; and a focused-position moving section that moves in a direction of the optical axis and a direction parallel to one face of the recording medium a focused position where the recording light beam is focused to the transmission type recording medium by the focusing section, wherein the focused position is moved by moving the transmission type recording medium, the focused-position moving section sets the focus position at a first position to form a first hologram in the transmission type recording medium at the first position, and the focused-position moving section sets the focus position at a second position to form a second hologram in the transmission type recording medium at the second position, the first position being different from the second position in the direction of the optical axis, and the focusing section focuses the recording light beam at an angle θ which satisfies sin θ>0.2 with respect to the optical axis.