Lighting area-selectable background lighting device for picture viewing machine

Abstract

A lighting area-selectable background lighting device for a viewing industrial crack detection photographic plate viewing machine is composed of an active controller, an LED lighting plate and a wave-band switch, and is characterized in that the input end of the active controller is connected with a 220VAC power supply; the output end of the active controller is connected with the positive end and the negative end of a lighting plate and built-in sectional connection points of the lighting plate; and the connecting points of the wave-band switch are respectively connected with the built-in sectional connection points of the lighting plate. By utilizing the picture viewing machine provided by the invention, the lighting area of the background lighting device can be selected in a sectional manner, therefore, when viewing standard photographic plate, the size of the background lighting can be selected according to the specification of the standard photographic plate, so that a user is facilitated to view the photographic plate, the energy is saved, requirements on production, life, energy conservation and low carbon of modern social are met, the development prospect is active, and the market demand is large.

Description

technical field [0001] The utility model relates to a background light device for viewing an optional light area of ​​an industrial flaw detection photographic film viewer. Background technique [0002] Industrial flaw detection operations often require viewing standard photographic negatives taken after flaw detection. Need to use the film viewer with background light when viewing above-mentioned photographic film. [0003] The width of the light-emitting area of ​​the background light of the known technology film viewer is fixed, although it can basically meet the film viewing requirements, but when viewing a standard negative film shorter than the film viewing screen, it is necessary to use a cover to block the screen that is not covered by the negative film Otherwise, the background light of the film viewing screen that is not covered by the negative film will directly enter the eyes, affecting the viewing of the film. At the same time, the background light of the unus...

AI Technical Summary

Problems solved by technology

[0003] The width of the light-emitting area of ​​the background light of the known technology film viewer is fixed, although it can basically meet the film viewing requirements, but when viewing a standard negative film shorter than the film viewing screen, it is necessary to use a cover to block the screen that is not covered by the negative film Otherwise, the background light of the film viewing screen without the negative film blocking part will directly enter the eyes, affecting the film viewing

At the same time, the background light of the unused part can directly cause energy waste, which does not meet the requirements of modern society for energy saving and low carbon in various production and life

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