OPTICAL PICKUP DEVICE, IRRADIATING METHOD, INFORMATION RECORDING DEVICE AND INFORMATION REPRODUCING DEVICE, AND COMPUTER PROGRAM

摘要

An optical pickup device (10) comprising a light source (11) for irradiating the recording surface of an information recording medium (100) with an output light, a light intensity controlling means (26) for controlling the light source so as to change the light intensity of the output light into an almost sinusoidal form, a filter (13) disposed on the light path of the output light to change the transmission amount of an incident output light, and a filter controlling means (27) for controlling the filter so as to change the transmission amount of the output light.