OPTICAL PICKUP USING THE PRINCIPLE OF THE PHOTOLUMINESCENCE

摘要

An optical head using the principle of photoluminescence is disclosed. According to an embodiment of the present invention, the optical head is an optical head (100) including photoluminescence substances for generating a point source inside an optical system. The optical head comprises a condensing lens (110) and a point source part (120) formed in a layer on the focal surface (111) of the condensing lens and including the photoluminescence substances (121). The optical head according to the present invention can make a light spot with a smaller size than a diffraction limit since the photoluminescence substances are formed in a layer layer on the focal surface of the condensing lens, thereby overcoming the diffraction limit of the optical system.