GB1046422A - Improvements in or relating to oscillographic recorders - Google Patents

Abstract

1,046,422. Photographic print-out processes. HONEYWELL Inc. April 11, 1963 [April 11,1962], No. 14647/63. Heading G2C. [Also in Division G1] In an oscillographic recorder wherein a spot of high intensity radiation produces a trace on a print-out paper or film 4 sensitive to such radiation, the trace being at first latent but becoming almost immediately visible upon subsequent exposure of the paper to all over radiation, the postrecording treatment for rendering the trace visible comprises the subjection of the paper to radiation of the wavelengths to which it is primarily responsive and to infra-red radiation or heat. Preferably the exposed paper is heated to a temperature as high as practical in the range 170‹F to 400‹F and while so heated it is exposed initially to low intensity light radiation and thereafter to high intensity radiation of substantially the same wavelengths as employed in producing the trace i.e. principally between 3000 A‹ and 4000 A‹. As shown, Fig. 2, a concentrated beam of high intensity ultra-violet radiation from a super-high pressure mercuryvapour lamp enclosed in a quartz envelope is reflected through a filter 12 and lens to the mirror 8 of each galvanometer in a group and thence to the paper 4 as it passes the recording plane between reels 2,3. The position of the high-energy spots may be observed through an amber-coloured window 15 and yellow light (5500 A‹ to 5800 A‹) from a lamp 16 facilitates observation of the traces as they appear. Heat from an electrically-heated platen 17 and visible and ultra-violet radiations from lamps 18, 19 mounted each side co-operate to latensify the latent images as the paper 4 is drawn downwardly. The preferred print-out paper is that disclosed in Specification 1, 018, 552.