Light source equipment, optical scanner and data reading apparatus using the same

摘要

The light source equipment is provided with a light source(1) and an anamorphic single lens(2). The anamorphic single lens(2) has different refracting powers in the x and y directions orthogonal to each other, and converts a light from the light source(1) to a light beam in a required state. Farther the anamorphic single lens(2) satisfies the following equation: $$ $ where\; fx\; is\; a\; focal\; length\; in\; the\; x\; direction,\; fy\; is\; a\; focal\; length\; in\; the\; y\; direction,\; and\theta y\; is\; a\; half\; angular\; divergence\; of\; radiant\; intensity\; of\; the\; light\; in\; the\; y\; direction.\mathop{\mathrm{image}}$$$