| 摘要 |
PROBLEM TO BE SOLVED: To suppress deterioration in optical performance caused by change in environmental conditions (temperatures and humidity) without enlarging and complicating an optical head.SOLUTION: An optical head (10) comprises: a lens array (3) having a plurality of lenses (30) formed of resin; a holder (4) for holding the lens array (3); and positioning mechanisms (45, 46, and 47) which position the holder (4) so that the holder opposes to an image formation object (12). The positioning mechanisms (45, 46, and 47) are configured to change distances between the lens array (3) and the image formation object (12) according to change in at least either one of temperatures and humidity.SELECTED DRAWING: Figure 7 |
