| 摘要 |
A hood structure incorporating a close-up lens and a specific light source whose intensity may be varied serves to support a conventional camera in front of an oscilloscope screen for photographing an oscilloscope trace. The hood blocks ambient light from the camera and the specific light source in the hood controls the exposure of the camera such as the shutter speed and/or the f-stop opening by causing this light source to shine on the photocell and by varying its intensity. Since the invention permits the use of a conventional camera, the entire apparatus is extremely economical for photographing oscilloscope traces.
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