Infrared absorption filter

• Main Authors: ONOMICHI SHINYA, YOKOYAMA SEIICHIRO, SHIMOMURA TETSUO
• Format: Patent
• Language: English; Korean
• Published: 30.08.2001
• Edition: 7
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

PURPOSE: An infrared ray absorption filter is provided to obtain an absorption in the near infrared region and high transmittance in the visible region, besides no large absorption of a specified wavelength in the visible region, also to have excellent environmental stability and durability and furthermore have few optical defects. CONSTITUTION: The infrared ray absorption filter comprises an infrared ray absorption layer laminated at least on a surface of a transparent polymer film. The infrared ray absorption filter is characterized by comprising the transparent polymer film being a film with an easy to adhere polymer layer laminated at least on the one side, by essentially containing no particle in the transparent polymer film and furthermore by containing 10 /m2 or less of 20 microns or more sized foreign matters per unit area of the film in the transparent polymer film. 본 발명은, 근적외선영역에 흡수가 있어, 가시영역의 광투과성이 높고, 또한 가시영역에 특정파장이 큰 흡수를 가지지 않으며, 또한 환경안정성이나 내구성이 우수하고, 또한 광학결점이 적은 적외선 흡수필터로서, 투명 고분자필름의 적어도 한쪽면에 적외선 흡수층을 적층하여 된 적외선 흡수필터에 있어서, 상기 투명 고분자필름은 적어도 한쪽면에 고분자 접착용이층을 적층한 필름이고, 또한 상기 투명 고분자필름중에는 실질적으로 입자를 함유하고 있지 않으며, 더욱이 상기 투명 고분자필름중에 크기 20㎛ 이상의 이물질이 필름의 단위면적당 1O개/㎡ 이하인 적외선 흡수필터를 사용한다.