Platinum Optics Technology Inc.

Ptot (suzhou) Inc.

Chung-Han Lu

Hsiao-Ching Shen

Chun-Cheng Hsieh

Ming-Zhan Wang

Hsin-Miau Peng

Liang-Yu Yen

An absorption type near-infrared filter comprising a first multilayer film, a second multilayer film, and an absorption film, wherein in the ultraviolet band, the difference of between the wavelength with the transmittance at 80% of the absorbing film and the wavelength with the reflectivity at 80% of the first multilayer film falls in the range between 25 nm and 37 nm, the difference of between the wavelength with the transmittance at 50% of the absorbing film and the wavelength with the reflectivity at 50% of the first multilayer film falls in the range between 6 nm and 14 nm, and the difference of between the wavelength with the transmittance at 20% of the absorbing film and the wavelength with the reflectivity at 20% of the first multilayer film falls in the range between −6 nm and 2.5 nm.

Absorption type near infrared filter

An absorption type near-infrared filter comprising a first multilayer film, a second multilayer film, and an absorption film comprising an infrared absorbing dye with a weight percentage between 1% and 3%, wherein in the infrared band, the difference between the wavelength with the transmittance at 80% of the absorption film and the wavelength with the reflectivity at 80% of the first multilayer film ranges between 130 nm and 145 nm; the difference between the wavelength with the transmittance at 50% of the absorption film and the wavelength with the reflectivity at 50% of the first multilayer film ranges between 75 nm and 90 nm; the difference between the wavelength with the transmittance at 20% of the absorption film and the wavelength with the reflectivity at 20% of the first multilayer film ranges between 25 nm and 45 nm.

The present disclosure provides a near-infrared absorbing filter, including an absorbing type infrared filtering medium having opposite first and second surfaces; an organic coating layer formed on the first surface of the absorbing type filtering medium for absorbing infrared rays; a first multi-layered film structure formed on the organic coating layer with the organic coating layer disposed between the first multi-layered film structure and the absorbing type infrared filtering medium; and a second multi-layered film structure formed on the second surface of the absorbing type infrared filtering medium. The near-infrared filter of the present disclosure is able to reduce the wavelength difference of T50 and T20 of the incident light within the range of from 0 to 30 degrees to less than 5 nm, thereby reducing chromatic aberration effectively and reducing ghost images of infrared reflections. The disclosure further provides an image sensor including the near-infrared absorbing filter.

Growing community of inventors

Taoyuan, Taiwan

Chung-Han Lu