Optical window member

• US 8,164,833 B2
• Filed: 07/03/2007
• Issued: 04/24/2012
• Est. Priority Date: 02/20/2007
• Status: Expired due to Fees

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Inventors: Yuba, Takashi, Arita, Takashi
• Primary Examiner(s): NGUYEN, THONG Q
• Application Number:
  US11/822,302
• Publication Number:
  US 20080198469A1
• Time in Patent Office: 1,757 Days
• Field of Search: 359/599, 359601-614, 359/831, 359577-590, 359/742
• US Class Current: 359/599
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing
• CPC Class Codes: G02B 5/0215 the surface having a regular structure
• CPC Class Codes: G02B 5/0231 the surface having microprismatic or micropyramidal shape macroscopic prism arrays G02B5/045
• CPC Class Codes: G02B 5/0268 characterized by the fabrication or manufacturing method
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: Y02E 10/52 PV systems with concentrators

Abstract

An optical window member includes a transparent synthetic resin plate having a surface with a protruding/recessed pattern of a predetermined fineness that causes light diffusion, and an optical thin film formed on the surface of the transparent synthetic resin plate with the protruding/recessed pattern. The optical thin film determines a component of light transmitted through the optical thin film and light reflected from the optical thin film.

Claims

1. A solar-powered watch, comprising:

an optical window member, including—

a transparent synthetic resin plate having a top surface with a pattern of a plurality of concentric and contacting protrusions/recesses that cause light diffusion, and a bottom surface opposite the top surface; and

an optical thin film having a top surface and a bottom surface, the bottom surface being positioned at the top surface of the transparent synthetic resin plate, each of the top and bottom surfaces of the optical thin film having a protruding/recessed pattern corresponding to the pattern on the top surface of the plate,

wherein the optical thin film is a top layer of the optical window member, and

wherein each of the protruding/recessed patterns is regularly arranged at a predetermined same pitch; and

a solar battery positioned near the bottom surface of the plate,

wherein light irradiated in a direction perpendicular to the top surface of the optical thin film enters the optical thin film through the pattern on the top surface of the optical thin film, some of the entering light is reflected by the pattern on the top surface of the plate out of the pattern on the top surface of the optical thin film, a remainder of the light passes through the pattern on the top surface of the plate, some of which charges the solar battery and some of which is reflected by the battery and exits through the patterns and out the top surface of the optical thin film, and

wherein the light diffusion substantially prevents seeing the battery through the optical window member.

2. The watch according to claim 1,

wherein the respective top surfaces of the transparent synthetic resin plate and the optical thin film are divided into plural sections and sectional shapes of the protruding/recessed patterns are different in each of the sections.

3. The watch according to claim 2,

wherein each of the protrusions has a sectional shape that is any one of a triangle, a trapezoid, a semicircle, and a trapezoid whose oblique sides are both staircase-like lines.

4. The watch according to claim 1, wherein:

the optical thin film comprises at least one thin film of a high refractive index and at least one thin film of a low refractive index that are laminated alternately.