| 摘要 |
PURPOSE:To reduce the deviation of distance measuring from a contrast pattern by detecting the reflected light from a detection object with three light receiving surfaces and operating the signal component of the center area with signal components of outer areas to perform focusing. CONSTITUTION:The light emitted from a light projecting element 4 is allowed to pass a projection lens 3 and passes a dichroic mirror 13 and lens groups 12 and 2 to form a projected spot on a subject 1. A photodetector 6 which receives the light reflected from the object 1 has a light receiving surface consisting of three areas 6a, 6b, and 6c, and the signal component from the center area 6c and signal components from the other areas 6a and 6b are operated by a signal processing circuit 7, and a motor 9 is driven by the control of a microcomputer 8 to perform focusing. |
