Patent ID: 7192153

Claim:
A light irradiation apparatus comprising: light projecting means for projecting light; a lens having light diameter expanding means for expanding a diameter of light projected from said light projecting means to be projected, light collimating means for receiving incident light having the diameter thereof expanded by said light diameter expanding means to be projected as approximately collimated light, and a lens unit in which said light diameter expanding means and said light collimating means are integrally formed, wherein said light projecting means is a laser light emitting module which projects laser light, and wherein said laser light emitting module comprises: a resonator comprising a solid-state laser medium, a non-linear optical element which converts a wavelength of light emitted from said solid-state laser medium, and a pair of resonance reflective portions between which said solid-state laser medium and said non-linear optical element are held to reciprocate light; a laser diode which emits light to excite said solid-state laser medium; and a window cap in which a window portion is formed to take out light projected from said resonator and which accommodates said resonator and said laser diode, the window cap being a single integrated component having: a sidewall portion having an approximately cylindrical shape, a portion of the sidewall portion having a bend in a direction toward the central axis of the sidewall portion to form a slant side plane portion of the sidewall portion; a slant opening surface obliquely formed to the central axis of the sidewall portion, the slant opening surface being bounded by the slant side plane portion and the sidewall portion, the slant opening surface having a window portion formed therethrough for taking out the light projected from the resonator.