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monoscope
A monoscope was a special form of video camera tube which displayed a single still video image. The image was built into the tube, hence the name. The tube resembled a small cathode ray tube (CRT). Monoscopes were used beginning in the 1950s to generate TV test patterns and station logos. This type of test card generation system was technologically obsolete by the 1980s.
== Design ==
The monoscope was similar in construction to a CRT, with an electron gun at one end, but in place of a phosphor-coated screen which displayed an image, it had a metal target with an image formed on it. As the electron beam scanned the target, varying amounts of electrons were reflected from the different areas of the image. The reflected electrons were picked up by an internal electrode ring, producing a varying electrical signal which was amplified to become the video output of the tube.
This signal reproduced an accurate still image of the target, so the monoscope was used to produce still images such as test patterns and station logo cards. For example, the classic Indian Head test card used by NBC, shown on the right was often produced using a monoscope.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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