Lamp reflecting mirror comprising polyphenylene sulfide, calcium silicate whiskers and a granular inorganic filler

• US 5,945,775 A
• Filed: 03/13/1997
• Issued: 08/31/1999
• Est. Priority Date: 03/14/1996
• Status: Expired due to Fees

• Current Assignee: Koito Manufacturing Company Limited
• Original Assignee: Koito Manufacturing Company Limited
• Inventors: Ikeda, Toshimasa, Toki, Junji, Yoshimoto, Yuji
• Primary Examiner(s): O'Shea, Sandra
• Assistant Examiner(s): HAYNES, MACK NELSON
• Application Number:
  US08/815,926
• Time in Patent Office: 901 Days
• Field of Search: 313/110, 313/112, 313/113, 313/493, 313/573-574, 313/580, 313/634-636, 523/212, 523/218-219, 524/425, 524/449, 524/609, 521/54
• US Class Current: 313/113
• CPC Class Codes: C08K 3/34 Silicon-containing compounds
• CPC Class Codes: F21S 41/37 characterised by their material, surface treatment or coatings
• CPC Class Codes: F21V 7/24 characterised by the material
• CPC Class Codes: F21V 7/28 characterised by coatings

Abstract

The invention provides a lamp reflecting mirror in which sufficient light reflecting characteristic (surface smoothness) can be obtained without application of any undercoat layer and in which heat resisting property, luminous intensity distributing performance (dimensional stability) and form retaining characteristic (material stiffness) at the time of adjustment of the optical axis can be satisfied at the same time. The lamp reflecting mirror is produced by injection molding a composition containing 30 to 50% by weight of polyphenylene sulfide resin, 5 to 30% by weight of calcium silicate whiskers, and 20 to 65% by weight of granular inorganic filler.

Claims

1. A lamp reflecting mirror obtained by injection molding a composition containing 30 to 50% by weight of polyphenylene sulfide resin, 5 to 30% by weight of calcium silicate whiskers, and 20 to 65% by weight of granular inorganic filler.

2. A lamp reflecting mirror according to claim 1, wherein said reflecting mirror has an overall surface that is split into a plurality of surfaces, wherein the surfaces have boundary portions that have a difference in level.

3. A lamp reflecting mirror according to claim 1, wherein a diameter of said calcium silicate whiskers is not larger than 3 μ

m, and a length thereof is not larger than 40 μ

m.

4. A lamp reflecting mirror according to claim 1, wherein a diameter of said granular inorganic filler is not larger than 5 μ

m.