Patent ID: 7486857
Filing Date: 2009-02-03
Classification: G02B

Abstract:
1. An optical wavelength identification apparatus, comprising: an optical diffraction device for dispersing light into light components each having different wavelength; a focusing lens for focusing the light components dispersed from the optical diffraction device, the focusing lens having a predetermined focal length f and a focal length temperature coefficient β; a light receiving device for identifying wavelengths of the light components based on incident positions of the light components focused, the light receiving device being made of material having a predetermined temperature coefficient α a board for fixing the optical diffraction device, the focusing lens, and the light receiving device, the board being made of material having a predetermined temperature coefficient α, the distance between the focusing lens and the light receiving device being set at f; wherein, for a distance coefficient k (0<k≦1), the distance between the optical diffraction device and the focusing lens is set at a product f·k, and the focal length temperature coefficient β and the distance coefficient k are set such that the focal length temperature coefficient β and the predetermined temperature coefficient α