| 摘要 |
PURPOSE:To eliminate the comatic aberration by constituting the processor so that an optical axis of an incident beam and an optical axis of an objective lens, and also a normal on the recording surface of a recording medium are always parallel to each other. CONSTITUTION:A current is supplied to tilt coils 44a, 44b of a magnetic circuit B, and by an electromagnetic action of magnets 43a, 43b, a base 17 is inclined in the tilt direction (c) by deforming elastically a tilt plate spring 35. In this case, an objective lens 11 is inclined within a range of, for instance, angles theta- theta', and also, a start mirror 5 is also inclined by the same angle in the same direction. In such a way, since the start mirror 5 is inclined by the same angle in the same direction as the objective lens 11, an optical axis (f) of the objective lens 11 and an optical axis (e) of an incident light are allowed to coincide with each other. Accordingly, a comatic aberration of a light beam in a condensing point of the objective lens is reduced, and the recording capacity of a recording medium is increased. |
