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1. (WO2010116862) COLLIMATING LENS

Pub. No.:    WO/2010/116862    International Application No.:    PCT/JP2010/054337
Publication Date: Fri Oct 15 01:59:59 CEST 2010 International Filing Date: Tue Mar 16 00:59:59 CET 2010
IPC: G02B 13/00
G02B 13/18
Applicants: ALPS ELECTRIC CO.,LTD.
アルプス電気株式会社
KAMEDA Hiroshi
亀田 博史
KYOYA Shoichi
京谷 昇一
NAKAGAWA Masayoshi
中川 正義
KONDO Yasuyuki
近藤 康之
Inventors: KAMEDA Hiroshi
亀田 博史
KYOYA Shoichi
京谷 昇一
NAKAGAWA Masayoshi
中川 正義
KONDO Yasuyuki
近藤 康之
Title: COLLIMATING LENS
Abstract:
Provided is a collimating lens that can be implemented with a single lens and has low chromatic aberration. Said collimating lens collimates light from a laser device used in a laser display device. The light from the laser device has a wavelength between 375 and 750 nm. The collimating lens has a numerical aperture between 0.2 and 0.75 and fulfills both of the following conditions: (1) D/f > 0.85, with lens thickness D and focal length f; and (2) Abbe number νd > 57.