Optical Filter and Lighting Apparatus

• US 20080266690A1
• Filed: 09/13/2005
• Published: 10/30/2008
• Est. Priority Date: 03/16/2005
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Asahi Matsushita Electric Works Ltd. (Panasonic Holdings Corporation)
• Inventors: Toda, Naohiro, Tanaka, Wataru, Noguti, Hiroki
• Granted Patent: US 8,164,844 B2
• Time in Patent Office: Days
• US Class Current: 359/885
• CPC Class Codes: A61M 2021/0044 by the sight sense
• CPC Class Codes: A61M 21/02 for inducing sleep or relaxation, e.g. by direct nerve stimulation, hypnosis, analgesia for massage A61H; electrotherapy A61N, e.g. applying alternating or intermittent electric currents for producing anaesthesia A61N1/36021
• CPC Class Codes: A61N 5/0618 Psychological treatment

Abstract

An optical filter and a lighting device using the same wherein the suppression of the melatonin secretion by the reception of light in the nighttime is prevented and the color of light is maintained desirable are provided. The optical filter has a mean transmissivity of a light beam in a wavelength range of about 480˜550 nm is about 30% or less. The optical filter is formed by at least molding a transparent resin and a resin composition material containing an orange color series fluorescent dye material, and, for 100 weight part of the transparent resin, the resin composition material containing about 0.005˜0.2 weight part of the orange color series fluorescent dye material is molded. This can prevent the suppression of the melatonin secretion in the nighttime. The color of light is maintained desirable. The optical filter may be applied to a lighting apparatus.

Claims

1. An optical filter wherein a mean transmissivity of a light beam in a wavelength range of about 480-550 nm is about 30% or less.

2. The optical filter in accordance with claim 1, wherein, in addition to the wavelength range, a mean transmissivity of the light beam in a wavelength range of about 430-445 nm is about 50% or less and a mean transmissivity of the light beam in a wavelength range of about 530-565 nm is about 45% or more and about 75% or less.

3. The optical filter in accordance with one of claims 1 and 2, wherein the optical filter is formed by molding a transparent resin and a resin composition material containing an orange color series florescent dye material.

4. The optical filter in accordance with claim 3, wherein, for 100 weight part of the transparent resin, the resin composition material containing about 0.005-0.2 weight part of the orange color series florescent dye material is molded.

5. The optical filter in accordance with claim 3, wherein, for 100 weight part of the transparent resin, the resin composition material containing a compound of about 0.005-0.2 weight part of the orange color series florescent dye material and about 0.25-4 weight part of an ultraviolet ray absorbent having an absorption peak at a wavelength ranging from 330 to 400 nm is molded.

6. The optical filter in accordance with claim 3, wherein, for 100 weight part of the transparent resin, the resin composition material containing a compound of about 0.005˜

0.2 weight part of the orange color series florescent dye material and about 0.005-0.01 weight part of a yellow color series florescent dye material is molded.

7. A lighting apparatus having an optical filter in accordance with one of claims 1 through 6.