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Video camera tube
The video camera tube was a type of cathode ray tube used to capture the television image prior to the introduction of charge-coupled devices (CCDs) in the 1980s. Several different types of tubes were in use from the early 1930s to the 1980s.
In these tubes, the cathode ray was scanned across a target which was illuminated by the scene to be broadcast. The resultant current was dependent on the brightness of the image on the target. The size of the striking ray was tiny compared to the size of the target, allowing 483 horizontal scan lines per image in the NTSC format, or 576 lines in PAL.〔NTSC#Lines and refresh rate〕
==Cathode ray tube==
Any vacuum tube which operates using a focused beam of electrons, "cathode rays", is known as a cathode ray tube (CRT). However, in the popular lexicon "CRT" usually refers to the "picture tube" in a CRT television. With the introduction of the personal computer in the early 1980s, "cathode ray tube" (quickly replaced by the acronym "CRT") became the word used for the display, which looked like a small television. It is only one of many types of cathode ray tubes. Other CRTs include the tubes used in television, oscilloscopes, or radar displays. The camera pickup tubes described in this article are also CRTs, but they display no image, and are not kinescopes.〔"Cathode-ray tube", ''McGraw-Hill Concise Encyclopedia of Science & Technology'', Third Ed., Sybil P. Parker, ed., McGraw-Hill, Inc., 1992, pp. 332-333.〕
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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