Abstract: A holder for holding a display device is divided into a first holder (5) and a second holder (6), and a light source housing chamber (10) for housing a light source (1) is also divided so that a work for mounting the light source (1) to the light source housing chamber (10) becomes easy. A first reflector (55) and a second reflector (65) integrally formed with the holder and having a reflecting surface corresponding to a light emitting part of the light source (1) are provided in the light source housing chamber (10), thus a certain space is secured around the light source, the light is efficiently incident to a light guide plate, and a separately formed reflector becomes unnecessary.

Abstract: A pickup moving mechanism for making it difficult to generate a deviation between an optical axis of an optical pickup and a target position on a disk. This mechanism is constituted to comprise: an elevation member tilting a guide member based on an angle deviation of the optical axis of the optical pickup in a disk diameter direction, and inclining the optical pickup supported by the guide member in a direction in which the angle deviation of the optical axis decreases; a cam follower; a tilt motor; an eccentric cam; an urging means; and a controller for controlling a pickup motor operating a screw member and an engagement member so as to move the optical pickup in a direction in which the deviation of the optical axis in the disk diameter direction generated by inclination of the optical pickup decreases.

Abstract: In order to correct the change in the offset and amplitude of a tracking error signal because of the change in the position of an object lens from the center of an optical pickup, the offset amount and amplitude value of the tracking error signal with respect to the displacement amount of the object lens from the center of the optical pickup are checked beforehand, and the displacement amount of the object lens is estimated on the basis of a tracking correction signal by using an object lens displacement observer.