| 摘要 |
PURPOSE:To secure easily a prescribed angle relation between a sensor lens and a photodetector by forming a spherical form part on the 1st surface of the sensor lens, a cylindrical form on the other surface and a bus bar of the cylindrical surface of a convex cylindrical form part and a reference part set at a prescribed geometric position at an outer form part respectively in a one body. CONSTITUTION:A spherical form part 2 and a cylindrical form part 3 are formed on the 1st surface and the other surface of a sensor lens 1 formed by plastic, etc. in a monolithic structure. A pair of projected flange parts 4 are formed at an external form part, and the side surfaces 5 of parts 4 are set approximately parallel to a generator L of the cylindrical surface of the part 3. The generator L is always attached at a prescribed geometric position to a holder 6 by securing coincidence between a base line K of the holder 6 and a base line G formed by the paired parts 4. The holder 6 is fixed via a screw 10 after having coincidence between a groove part 9 and a screw hole 11 of the main body 51 of the holder 6. As a result, a cross angle between the base line of a photodetector and the generator L can always be kept at 45 deg.. |
