| 摘要 |
PURPOSE:To obtain one system of a detection apparatus, by detecting the shift quantity of focus matching by performing the judgment of focus matching and focus non-matching on the basis of the comparing result of the integration level and stepwise signal level of an input signal. CONSTITUTION:Switches SW 16, 17 are turned ON by the timing signals M1, M2 from CPU 25 and the light emitted from a light emitting element 1 through a subject is received by light receiving parts 5a, 5b and the sum signal (A+B) thereof is introduced into an integrating circuit 21. After the completion of this integration, the integrated value is supplied to a sample hold circuit 22 and a resistor group 23 by a signal M4 and comparing levels V4-V0 are generated at the connection points of resistors 23a-23f. Next, only the switch SW 16 is turned ON by the signal M2 and the integration of a signal A is performed and the integrated value thereof is given to a comparator group 24. The comparing result is taken in CPU 25 to perform the judgment of focus matching and focus non-matching. |
