NEAR INFRARED RAY FILTER AND VISIBLE LIGHT FILTER

Title:

NEAR INFRARED RAY FILTER AND VISIBLE LIGHT FILTER

Document Type and Number:

Japanese Patent JP2004123509

Kind Code:

A

Abstract:

To provide a thin neutral filter having a flat spectral transmission characteristics in the range of the whole or a part of the near infrared rays region or a short wave visible light region.

The spectral transmission characteristics in the range of wave length of 800-1,800 nm is flattened by combining ≥2 kinds among MnO2, CoO, Co2O3, NiO, CuO, V2O5, Sm2O3, Er2O3, Pr2O3, and Ho2O3. The spectral transmission characteristics in the range of wave length of 400-450 nm is flattened by combining ≥1 kind(s) among P2O5, V2O5, NiO, K2Cr2O7, and Pr6O11.

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Inventors:

TSUTSUMI TAKASHI

Application Number:

JP2003106144A

Publication Date:

April 22, 2004

Filing Date:

April 10, 2003

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Assignee:

OMG CO LTD

International Classes:

G02B5/22; C03C3/091; C03C3/093; C03C3/095; C03C3/21; C03C4/10; (IPC1-7): C03C4/10; C03C3/091; C03C3/093; C03C3/095; C03C3/21; G02B5/22

Attorney, Agent or Firm:

Seiichi Nonaka

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