OPTICAL FILTER AND METHOD FOR MANUFACTURING SAME

• US 20100040865A1
• Filed: 09/28/2007
• Published: 02/18/2010
• Est. Priority Date: 09/28/2006
• Status: Abandoned Application

• Current Assignee: Seiko Precision Incorporated (Seiko Group)
• Original Assignee: Seiko Precision Incorporated (Seiko Group)
• Inventors: Kinoshita, Takeshi
• Application Number:
  US12/443,308
• Publication Number:
  US 20100040865A1
• Time in Patent Office: Days
• US Class Current: 428/323
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: G02B 2207/101 Nanooptics
• CPC Class Codes: G02B 26/007 the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
• CPC Class Codes: G02B 26/023 comprising movable attenuating elements, e.g. neutral density filters
• CPC Class Codes: G02B 5/205 Neutral density filters
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: G03B 11/00 Filters or other obturators specially adapted for photographic purposes
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/30 Self-sustaining carbon mass or layer with impregnant or other layer

Abstract

An optical filter (10) is constituted by a flat plate (11), a rotation pin (12), and an actuation pin (13). The flat plate (11) includes a transparent substrate (31), a resin layer (32) formed on the transparent substrate (31), and a CNT layer (33) formed on the resin layer (32). The CNT layer (33) is disposed on the outermost layer. CNTs dispersed in the CNT layer (33) have a characteristic of more absorbing light that has a short wavelength. Therefore, by forming the CNT layer (33) on the outermost layer, it is possible to weaken the intensity of ultraviolet that is to reach the resin layer (32), and to prevent deterioration of a dye dispersed in the resin layer (32). Hence, the optical filter (10) acquires a satisfactory environment resistance.

Claims

1. An optical filter that attenuates light having a predetermined wavelength, comprising:

at least one resin layer containing a material that absorbs light having a predetermined wavelength; and

a carbon layer in which a carbon-based material is dispersed,

wherein the resin layer is formed on one surface of the carbon layer, and light that passes through the carbon layer enters the resin layer.

2. The optical filter according to claim 1,

wherein the resin layer is formed on a substrate having light transmissivity.

3. The optical filter according to claim 1,

wherein the material that absorbs light having the predetermined wavelength is polyethylenedioxythiophene.

4. The optical filter according to claim 1,

wherein the carbon-based material is comprised of carbon nanotubes.

5. The optical filter according to claim 4,

wherein the carbon nanotube has a diameter of 300 nm or smaller.

6. The optical filter according to claim 5,

wherein the carbon nanotube is mixed at a rate of 0.01 to 20 weight %.

7. A method for manufacturing an optical filter, comprising:

a resin layer forming step of forming at least one resin layer containing a material that absorbs light having a predetermined wavelength; and

a carbon layer forming step of forming a carbon layer in which a carbon-based material is dispersed on the resin layer,

wherein at the carbon layer forming step, the carbon layer is formed on a light entrance side of the optical filter, such that light that passes through the carbon layer enters the resin layer.

8. The method for manufacturing the optical filter according to claim 7,

wherein the resin layer is formed on a substrate having light transmissivity.

9. A method for manufacturing an optical filter, comprising:

a carbon layer forming step of forming at least one carbon layer in which a carbon-based material is dispersed; and

a resin layer forming step of forming a resin layer containing a material that absorbs light having a predetermined wavelength, on the carbon layer,

wherein a carbon-resin layer that includes the carbon layer formed at the carbon layer forming step and the resin layer formed at the resin layer forming step is transferred to a substrate having light transmissivity, such that the resin layer and the substrate having light transmissivity contact, and

at the resin layer forming step, the formation is performed in such a way that the carbon layer is positioned in a light entrance side of the optical filter so that light that passes through the carbon layer enters the resin layer.

10. A method for manufacturing an optical filter, comprising:

a resin printing step of printing a resin containing a material that absorbs light having a predetermined wavelength, on a substrate having light transmissivity; and

a carbon layer forming step of forming a carbon layer in which a carbon-based material is dispersed, on a surface, on which the resin is printed in the resin printing step, of a printed product,

wherein at the carbon layer forming step, the formation is performed in such a way that the carbon layer is positioned in a light entrance side of the optical filter so that light that passes through the carbon layer enters the resin.