| 摘要 |
<p>PURPOSE:To prevent mistaken picture recording, by delivering an alarm or discontinuing the recording immediately after the alarm is delivered in case a camera shifts out of its horizontal position in a picture recording mode. CONSTITUTION:A rec. switch 3 is set at the ON side to connect a position detector 1 and an alarm device 4. A position detector 14, if gets out of its normal position, detects the abnormal position with a metallic bar 14a having a contact with a contact 14b at one side. For the device 4, the level of a point A changes to L from H when both the switch 3 and a position detector 2 are turned on, and the output of a terminal Q1 of a monostable multivibrator 5 is set at L. Thus a lamp 6 incorporated into a viewfinder glows, and a photographer can confirm visually the lighting of the lamp 6 during a recording mode. When the shooting is desired with an abnormal position, a reset button 10 is pushed to switch off the lamp 6. The lighting of the lamp 6 is automatically switched off when a fixed period of time elapses, and at the same time the output of the terminal Q1 is changed to L from H. Then a negative pulse is supplied to a monostable multivibrator 7, and the output of a terminal Q2 is set to L. Then a piezoelectric buzzer 8 sounds, and then the switch 3 is turned off to prevent a video recording mistake.</p> |
