Polaroid

Polaroid, in the subject covered by the canonical Wikipedia article, is a type of synthetic plastic sheet used as a polarizer or polarizing filter. The name originated as a trademark of Polaroid Corporation and later became widely used as a generic term for this class of dichroic sheet material. It should be distinguished from the better-known Polaroid instant-camera brand: this entry concerns the optical material and its technical development, not cameras, instant film, or the later consumer-imaging business. The original Polaroid material was developed from Edwin H. Land's work on sheet polarizers. A patent was obtained in 1929, and the material was further developed in 1932. The early construction, commonly known as J-sheet, used microscopic crystals of iodoquinine sulfate, also called herapathite, embedded in a transparent nitrocellulose film. During production, the needle-like crystals were aligned by stretching the film or by applying electrical or magnetic fields. Their alignment gave the sheet dichroic behavior: light polarized parallel to the crystal direction was strongly absorbed, while light polarized perpendicular to that direction was transmitted. The material's operating principle is based on selective absorption of one component of polarized light. Electromagnetic radiation contains an electric-field component whose direction changes as the wave propagates. In a Polaroid sheet, the aligned conducting structures interact strongly with the component parallel to their orientation and absorb it, while the perpendicular component is affected much less and passes through. This makes the sheet useful for producing, analyzing, or filtering polarized light. The transmitted intensity through polarizers can be described using Malus's law. The original J-sheet was later superseded by H-sheet, an improved form invented by Land in 1938. H-sheet uses polyvinyl alcohol impregnated with iodine. Manufacturing stretches the polymer chains into alignment, and the iodine associates with those chains, making the material electrically conductive mainly along their length. As a result, light polarized parallel to the chains is absorbed and light polarized perpendicular to them is transmitted. Another formulation, K-sheet, uses aligned polyvinylene chains in a polyvinyl-alcohol matrix produced by dehydrating the polymer. K-sheet is notable for improved resistance to heat and humidity. Polaroid polarizing sheets have been used in sunglasses, liquid-crystal displays, optical microscopes, and other optical instruments. In eyewear, the material reduces glare from partially polarized reflections produced by relatively flat surfaces such as water, glass, and other horizontal or smooth areas. In displays, polarizers are essential components of liquid-crystal image formation. In microscopy and laboratory work, paired polarizers can reveal optical properties and stress patterns in transparent materials. The sheets can also be used to inspect molecular or chain orientation in transparent plastics such as polystyrene and polycarbonate. The technology's significance lies in converting a laboratory optical effect into a manufacturable, flexible sheet product. Its importance extends across consumer optics, scientific instruments, display technology, and materials inspection. Because the term entered common usage beyond its original trademark context, references to Polaroid polarizers may describe both the historically branded material and similar sheet polarizers made using related polymer-and-dye technologies.

The history of Polaroid polarizing material is closely connected with Edwin H. Land's development of practical sheet polarizers. Earlier polarizers could be made from crystals or other optical arrangements, but Land's work helped produce a thin, flexible material that could be manufactured in sheet form. The first significant patent associated with the material dates to 1929, and the technology was further developed in 1932. The earliest material, called J-sheet, embedded microscopic crystals of herapathite—iodoquinine sulfate—in a transparent nitrocellulose film. The crystals had to be oriented so that their optical behavior was consistent across the sheet. Alignment could be achieved by stretching the material or through electrical or magnetic fields. Once aligned, the crystals absorbed light polarized along their long-axis direction and transmitted light polarized at right angles to it. This construction was later replaced by H-sheet, introduced by Land in 1938. H-sheet used a polyvinyl alcohol film treated with iodine. Stretching the polymer aligned its molecular chains, while the iodine dopant gave the chains the electrical characteristics needed for selective absorption. This polymer-based design was more suitable for practical manufacturing and broadened the range of applications for sheet polarizers. K-sheet represented another development in the same general family. It used aligned polyvinylene chains within polyvinyl alcohol, produced by dehydrating the polymer. Its principal advantage was greater resistance to humidity and heat, properties that are important in eyewear, displays, instruments, and other products exposed to variable environments. The material's applications expanded as optical and electronic technologies developed. Polarizing sheets became important in sunglasses because they reduce glare from partially polarized reflections from surfaces such as water and glass. They also became essential in liquid-crystal displays, where polarizers work with the liquid-crystal layer to control the amount of light reaching the viewer. In optical microscopes, polarizers enable examination of birefringence, stress, and other light-dependent properties. Sheets can additionally expose internal orientation and stress patterns in transparent plastics, including polystyrene and polycarbonate. The word Polaroid was originally a trademark associated with Polaroid Corporation, but it subsequently became common terminology for polarizing sheet material. This semantic expansion reflects the technology's influence rather than a change in the material's underlying optical principle. The relevant principle remains dichroism: one polarization component is absorbed more strongly than the perpendicular component. The intensity of light transmitted by polarizing elements is commonly analyzed using Malus's law. This subject is therefore a technology and material trademark rather than an account of Polaroid instant cameras or photographic film. Its historical importance comes from the commercialization of flexible sheet polarizers and their adoption across eyewear, displays, scientific optics, and materials testing.

• 1938

  Introduction of H-sheet

  [1]Polaroid (polarizer)en.wikipedia.org

  Edwin H. Land developed H-sheet, a polyvinyl-alcohol-and-iodine polarizer that replaced the earlier J-sheet construction in many applications.

• 1932

  Further development of the polarizing sheet

  [1]Polaroid (polarizer)en.wikipedia.org

  The original polarizer technology was further developed, improving the practical use of aligned dichroic material in sheet form.

• 1929

  Original sheet-polarizer patent

  [1]Polaroid (polarizer)en.wikipedia.org

  Edwin H. Land patented the original Polaroid sheet-polarizer material, based on aligned herapathite crystals embedded in a transparent polymer film.

A foundational branded optical-material technology providing selective light transmission in flexible sheet form for glare reduction, display construction, microscopy, scientific analysis, and transparent-plastic inspection.

• Synthetic polarizing sheet

  J-sheet

  The original Polaroid sheet construction used microscopic herapathite crystals embedded in transparent nitrocellulose. The crystals were aligned during manufacture so the resulting film absorbed light polarized parallel to their orientation and transmitted the perpendicular component. J-sheet established the practical basis for flexible, manufactured polarizers before later polymer-based designs superseded it.

• Polymer polarizer · 1938

  H-sheet Polaroid

  Introduced by Edwin H. Land in 1938, H-sheet uses stretched polyvinyl alcohol impregnated with iodine. Stretching aligns the polymer chains, and iodine makes the aligned chains selectively absorb light polarized along their length. This formulation became an important practical successor to the crystal-based J-sheet.

• Durable polymer polarizer

  K-sheet

  K-sheet uses aligned polyvinylene chains formed in a polyvinyl-alcohol polymer by dehydration. It is designed to withstand heat and humidity better than some earlier polarizer constructions, making the material suitable for demanding optical and display environments.

• 2008

  Petters Group collapse triggers a second Polaroid bankruptcy

  The post-reorganization Polaroid entity sought bankruptcy protection shortly after criminal investigations involving its parent company, Petters Group Worldwide.

  Source

• 2008

  Petters Group collapse and Polaroid bankruptcy

  The post-reorganization Polaroid entity filed for Chapter 11 shortly after criminal investigations involving its parent company, Petters Group Worldwide, placing the brand's ownership and operations under further uncertainty.

  Source

• 2001

  Polaroid bankruptcy takeover criticized over executive bonuses

  The restructuring and asset sale attracted criticism because senior executives received retention bonuses while shareholders and many employees lost substantial value.

  Source

• 2001

  Criticism of bankruptcy executive bonuses

  The first bankruptcy restructuring was criticized because senior executives received retention bonuses while shareholders, current employees and retirees were left with little or no recovery.

  Source

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• 2026.08.25

  Reported2026.08.18

  Polaroid launches Pokémon collaboration collection[3]宝丽来推出宝可梦联名系列prnasia.com

  Polaroid launched a limited-edition Polaroid x Pokémon collaboration collection, with pre-sales starting August 25, 2026 at flagship stores and Pokémon Center (the official Pokémon merchandise online platform for the US, UK and Canada), and full sales from October 5, 2026 at Polaroid Tmall, JD.com flagship stores and selected offline Polaroid stores.

• 2026.08.25

  Reported2026.08.20

  Polaroid and Pokémon launch 30th anniversary collaboration cameras and film[4]宝丽来与宝可梦推出30周年联名相机及相纸finance.sina.com.cn

  To celebrate the 30th anniversary of the Pokémon series, Polaroid is launching a full set of Pokémon collaboration products, including Pokémon-themed Polaroid Go Gen 3 cameras, a Polaroid Now Gen 3 Pokémon edition, themed film and accessories. Pre-orders open August 25, with general release on October 5.

• 2021.04.22

  Reported2021.04.22

  Polaroid launches Polaroid Go instant camera[5]宝丽来推出宝丽来Go拍立得相机finance.sina.com.cn

  Polaroid launched Polaroid Go, described in the source as its smallest instant camera to date and the world’s smallest instant camera.

• 2020.08.25

  Reported2020.08.25

  Polaroid launches Hi-Print portable photo printer[6]宝丽来推出 Hi-Print 便携式照片打印机tech.sina.com.cn

  Polaroid launched the Hi-Print portable photo printer, which prints phone photos onto 2.3×3.4-inch photo paper in one minute.

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1. 1Polaroid (polarizer)en.wikipedia.org
2. 2Petters Group collapse triggers a second Polaroid bankruptcyen.wikipedia.org
3. 3宝丽来推出宝可梦联名系列prnasia.com
4. 4宝丽来与宝可梦推出30周年联名相机及相纸finance.sina.com.cn
5. 5宝丽来推出宝丽来Go拍立得相机finance.sina.com.cn
6. 6宝丽来推出 Hi-Print 便携式照片打印机tech.sina.com.cn
7. 7Polaroid launches S$161 mobile printer to print phone photos & memes into stickersmothership.sg