Disc unit and damper mechanism therefor

A disc unit comprising a body frame having an opening area inside thereof, a holder fitted to the body frame and movable up and down with respect to the plane of the body frame, a chassis disposed inside the opening area and mounting a pickup mechanism thereon, a rear holding interface for holding the side end portions of the chassis at the rear side onto the body frame via a damper, and elastic members disposed opposite the rear holding interface for holding the side end portions of the chassis onto the holder,

• wherein the elastic members cause the chassis to move up and down with respect to the plane of the body frame in response to like movements of the holder;
• each of the elastic members is formed of a cylindrical body having a pair of flange portions at the upper and lower end portions thereof, a pair of first fitting portions having a small diameter formed adjacent to the inner side of the flange portions, a pair of expansion portions having a large diameter formed between the first fitting portions, a second fitting portion having a small diameter formed between the pair of expansion portions;
• and the holder has a pair of supporting portions each provided with a holder interface formed to fit into the first fitting portions of the elastic members, and the chassis has front holding interfaces formed on the side end portions thereof to fit into the second fitting portion of the elastic members.