Polaroid (polarizer) Polaroid (polarizer) Polaroid is a type of synthetic plastic sheet which is used as a polarizer or polarizing filter. A trademark of the Polaroid Corporation, the term has since entered common use. The original material, patented in 1929 and further developed in 1932 by Edwin H. Land, consists of many microscopic crystals of iodoquinine sulphate (herapathite) embedded in a transparent nitrocellulose polymer film. The needle-like crystals are aligned during manufacture of the film by stretching or by applying electric or magnetic fields. With the crystals aligned, the sheet is dichroic: it tends to absorb light which is polarized parallel to
Instant camera in a single compartment, was invented in 1923 by Samuel Shlafrock. During 1977, was the height of the Instant Camera popularity but around 1979, Started the decline of Polaroid cameras. There were newer, smaller, and less expensive cameras and recording devices being introduced which was the start of the digital photography age being born In February 2008, Polaroid filed for Chapter 11 bankruptcy protection for the second time and announced it would discontinue production of its instant films and cameras, shut down three manufacturing facilities, and lay off 450 workers. Sales of the analog film by all makers dropped by