五十年代末和六十年代初,我国从苏联引进的ΦCP—41型感光仪至今还在广泛地应用于科研和生产。这种感光仪的主要特点是耐用性好,其主要易损部件是灯泡和光楔,如能及时更换损坏的灯泡和光楔即能保证仪器的正常使用。但是随着感光材料工业的发展,人们不仅对感光测试的精度要求日 The late fifties and early sixties, China imported from the Soviet Union ΦCP-41-type photometer is still widely used in scientific research and production. The main features of this photometer is durability, and its main wearing parts are bulbs and wedges, if the timely replacement of damaged bulbs and wedges that can guarantee the normal use of the instrument. However, with the development of the photosensitive material industry, people not only demand the accuracy of the photosensitive test day