Patent ID: 7945962

Claim:
An information memory apparatus comprising: a plate-like recording medium having a recording surface; a probe array for recording or reading information with respect to said recording medium; a first actuator for displacing said recording medium in a first direction parallel to the recording surface; and a second actuator for displacing said recording medium in a second direction, which is parallel to the recording surface and which crosses the first direction, wherein said probe array comprising a probe support device and m×n probes (each of m and n is an integer of 2 or more), in the probes, m probes being arranged at even intervals along the first direction and n probes being arranged at even intervals along the second direction on the probe support device, and an interval between tips of the probes adjacent to each other in the first direction being shorter than an interval between tips of the probes adjacent to each other in the second direction, and a mechanical minimum resonance frequency of said first actuator being different from a mechanical minimum resonance frequency of said second actuator.