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
Polaroid Corporation with the PDC-2000 in 1996; however, they failed to capture a large market share in that segment. They also made 35 mm and multi format scanners, such as Polaroid SpiritScan 4000 35 mm scanner (the first scanner with a 4000 DPI CCD) in 1999, and the Polaroid PrintScan 120 in 2000. The scanners received mixed reviews and saw heavy competition from Nikon and Minolta products. The entire line was discontinued when Polaroid entered bankruptcy in 2001. The original Polaroid Corporation filed for federal bankruptcy protection on October 11, 2001. The outcome was that within ten months, most of the business