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Lamp reflecting mirror comprising polyphenylene sulfide, calcium silicate whiskers and a granular inorganic filler
| Details |
Inventors: Ikeda, Toshimasa; Toki, Junji; Yoshimoto, Yuji;
Assignee: Koito Manufacturing Co., Ltd. (Tokyo, JP)
Primary Examiner: O'Shea; Sandra
Assistant Examiner: Haynes; Mack
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
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. |
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DETAILED DESCRIPTION It has been found that the aforementioned problems are solved by the provision of 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.
By molding a reflecting mirror using the aforementioned composition, excellent heat resisting property, dimensional stability, surface smoothness and stiffness can be obtained even in the case where a metal coating is provided directly without application of any undercoat layer.
Accordingly, the present invention further provides a method of producing a lamp reflecting mirror in which a reflecting mirror surface is formed from a metal coating without application of any undercoat layer on a substrate obtained by injection molding the aforementioned composition and then a top coat layer is applied onto the surface of the reflecting mirror.
According to the present invention, very good luminous intensity distributing performance can be obtained without occurrence of irregular reflection, particularly in a level-difference reflecting mirror in which luminous intensity distribution is controlled only by the reflecting mirror.
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