| 摘要 |
PURPOSE:To reduce signal transmission lines by transferring a TTL light-emission stop signal and exposure factors for flashing selectively from a common terminal to a strobe side in accordance with pieces of information before and after the start of photography and whether a light measuring circuit is in operaion or not. CONSTITUTION:When a release button which is not shown in figure is pressed by the 1st stage, a transistor (TR)Q1 turns on to transfer flashing exposure factors from an exposure controlling circuit 1 to a strobe side which is not shown in figure through an OP amplifier A30 and a terminal T2. When the release button is pressed by the 2nd stage, a mechanical sequence starts and when a switch SW30 (photography start detecting means) turns on, TRs Q30 and Q33 turn on to stop the generation of the factors by the OP amplifier A30. A TRQ35 is turned on and off under the control of a mode signal from the strobe side and when the TRQ35 is turned on, a TTL light-emission quantity detecting circuit 50 operates to output a light-emission stop signal from the terminal T2 through the conduction of the TRQ32. |
