| 摘要 |
<p>A near infrared ray shielding film which is a biaxially oriented film consisting of polyester containing a near infrared absorbing agent, and in which the weight decrease initiation temperature of the near infrared absorbing agent is at least 280°C, the haze value of the film is up to 5%, and a total light ray transmittance in a visible light of wavelength of 400-650 nm is at least 40%. Typically, optical characteristics in a visible light area and a near infrared area satisfy the following expressions (1)-(4). 1<T (850)<20 ...(1) 1<T (950)<20 ...(2) -10<T (620) - T (540)<10 ...(3) -10<T (450) - T (540)<10 ...(4) T (450), T (540), T (620), T (850) and T (950) denote respectively light transmittances (%) at wavelengths 450, 540, 620, 850, and 950 nm. This film is easy to handle, inexpensive, high in visible light transmittance, and suitably used for, e.g., the front panel of a plasma display having a function of preventing an erroneous operation given to peripheral apparatuses by near infrared ray emitted from the display surface of the plasma display.</p> |
