| 摘要 |
A focal point detecting device comprises a light-receiving device having a plurality of light-receiving elements which receive incident light coming from two different light paths. In the first step, the light-receiving device receives the incident light coming from the second light path while the first light path is blocked and the values of the photoelectric outputs A1, . . . An of each of the light-receiving elements are compared one with another and the compared values stored in a memory circuit. In the second step, the light-receiving device receives either the incident light coming from the first light path while the second light path is blocked or the incident light coming from both the first and second light path and the values of the photoelectric outputs B1, . . . Bn of each of the light-receiving element are compared on with another and the compared values are compared with the contents stored in the memory circuit and a focal point coincident signal is fed out in response to a favorable comparison. |
