| 摘要 |
PROBLEM TO BE SOLVED: To obtain an IR-ray lens having high transmittance and superior in mass-productivity. SOLUTION: This IR ray lens is produced by optically adhering a plastic material 3 having a lens formed molded on one surface to at least one surface of a plate material 1 consisting of an inorg. material having transmitting property for IR rays. The thickness of the plastic material 3 is suppressed to the min. to obtain a high transmittance of the lens. By this method, the lens can be formed by die molding and superior mass productivity can be realized. |
