| 摘要 |
PURPOSE:To form an optical system for photometry and optical system for distance measurement into a single system by using a detecting element which is disposed with a photoelectric element formed of an a(for amorphous)-Si layer on the incident light side and is disposed with a crystalline Si photoelectric element behind the same. CONSTITUTION:The detecting element is constitute by superposing and disposing the photoelectric transducer 2 formed of the a-Si layer on a glass substrate 3 and an Si photocell 4 provided on a glass substrate 5 in an incident direction of light. IR light P projected from an IR light emitting device 12 is reflected by a subject 13 and the reflected light R is made incident on the detecting element but said light is first made incident on the element 2. The visible light component is absorbed and the output signal corresponding to the luminance of the subject 13 is obtd. there and therefore, the photometric value of the subject is obtd. in a photometric circuit 14. The IR light component of the incident light is made incident on the cell 4 through the element 2. The output signal corresponding to the intensity of the IR light is obtd. there and therefore, said signal is processed in a distance measuring circuit 15, by which the distance up to the subject 13 is obtd. |
