| 摘要 |
PURPOSE:To stabilize a light emitting and a light receiving element mechanically by providing light passage holes formed in a partition wall, interference filters fitted in the respective passage holes, and a light reflecting means which is arranged on an optical path extending from an optical fiber collimator to a light receiving element collimator and adjustable in angle. CONSTITUTION:Light emitted by the light emitting element 29 is converted by a spherical lens 30 into a parallel beam, which passes through a light passage hole 32 and an interference filter 25 and is converged by a spherical lens 33 and coupled with an optical fiber 34. Further, the projection light from the optical fiber 34 is converted by the spherical lens 33 into a parallel beam, which is reflected by an interference filter 26 to pass through the hole 46 of a shield plate 45 and then reflected by a universal mirror 27 to pass through the light passage hole 41 of the interference filter 26, and the light is converged by a spherical lens 43 and coupled with the light receiving element 44. When respective elements are mounted on a case 21, the light emitting element collimator 22 and light receiving element collimator 23 are fixed at specific positions of the case 21 with screws. In this case, accuracy and optical path adjustment are not necessary unlike conventional products. |
