AVALANCHE PHOTODIODES FOR HIGH-RESOLUTION PET IMAGING SYSTEMS

In an optical magnetic recording and reproducing apparatus including a disc clamp member and a magnetic field biasing device, the disc clamp member and the magnetic field biasing device are pivotably supported by separate supporting members so as to undergo pivotal movement independently of one another with respect to a disc cartridge holder. This enables a compact arrangement in which the disc cartridge holder is compactly accommodated beneath the disc clamp member and the magnetic field biasing device during the loading of a record disc.