Optical unit and light irradiating device

Abstract

This invention provides an optical unit that does not require an operation of aligning the axis of the rod lens and the axis of the light condensing lens, and that can improve an assembling workability and reduce a cost with less number of forming processes and less number of components due to its downsized structure. In order to realize this optical unit provided are a light condensing section 41 and a light transmitting section 42 integrally formed at a distal end side of the light condensing section 41 with its axis coincided with an axis of the light condensing section 41. The light condensing section 41 is in a shape of a body of rotation substantially widening from a proximal end toward a distal end with centering on its optical axis C, and comprises a concave section 43 opening at a proximal end face 41a to accommodate the light emitting element 21, a side circumferential face 41c to reflect the light from the light emitting element 21 inward and a distal end face 41b to introduce the light from the light emitting element 21 into the light transmitting section 42. The light transmitting section 42 is in a substantially cylindrical shape, and comprises a proximal end face 42a to introduce the light from the light condensing section 41, a side circumferential face 42c to reflect the light introduced from the proximal end face 42a inward and a distal end face 42b to emit the light introduced from the proximal end face 42a outside.

Dependencies are inferred from the claim text.