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随着电视机的日益普及,人们对它提出了各种新的要求,对大画面的要求就是其中之一。由于大画面图象富有临场感和感染力,因此,家庭以及教育等领域对它的期望日趋强烈。投影电视的设想产生很早,但由于这种机器的亮度和清晰度还存在问题,加上操作复杂等原因,因此即使使用于业务服务方面还尚未普及。日本松下公司吸取了显象管、接收机电路以及光学系统等方面的最新技术,研制了60英寸投影电视机的投影管。这种投影管采用了有益于亮度和清晰度的施密特反射式光学系统和高效率的发光面,使最大实用亮度达到50英尺-朗伯以上,清晰度达到450线。此外,通过将光学部件与投影管的结构组装为一体,简化了电视机的装配和调试,降低了功耗。
With the increasing popularity of television, people put forward various new requirements for it, the requirements of the large screen is one of them. Due to the presence and appeal of large-screen images, expectations are growing in the fields of family and education. The concept of projection TV came very early, but due to the brightness and clarity of such machines, coupled with complex operations and other reasons, they have not yet become widely used in business services. Japan’s Matsushita learned the kinescope, receiver circuits and optical systems, and other aspects of the latest technology, developed a 60-inch projection TV projection tube. The projection tube uses a Schmidt reflective optical system for brightness and sharpness and an efficient light-emitting surface that achieves a maximum practical brightness of 50 feet - Lambert above and 450 lines of sharpness. In addition, by assembling the optical components with the structure of the projection tube, the television set-up and debugging are simplified, and the power consumption is reduced.