Title:
CONDENSER LENS, AND INSTRUMENT AND METHOD FOR MEASURING INCIDENT ANGLE
Document Type and Number:
Japanese Patent JP2004251817
Kind Code:
A
Abstract:
To provide a small-sized inexpensive condenser lens capable of reducing an influence onto a required sensor sensitivity range.
This condenser lens 1 has a visibility angle θ for condensing incident light from an outside on a two-dimensional sensor 2, and has a plurality of lenses L1-L7, and a light incidence preventing film provided on a lens face S3 out of the lenses to reflect the light outside a sensing wavelength range of the two-dimensional sensor 2. The lens face S3 is a lens face of which the maximum value, of an average incident angle provided by averaging incident angles in a plurality of incident points within the lens face, obtained within the range of the visibility angle θ is smaller than a half-angle of the visibility angle θ.
Inventors:
MATSUMIYA TAKESHI
TSUCHIKAWA MINORU
TSUCHIKAWA MINORU
Application Number:
JP2003043996A
Publication Date:
September 09, 2004
Filing Date:
February 21, 2003
Export Citation:
Assignee:
NEC CORP
International Classes:
G01B11/26; G01M11/02; (IPC1-7): G01B11/26; G01M11/02
Attorney, Agent or Firm:
Nobuyuki Kaneda
Katsuhiro Ito
Ishibashi Masayuki
Katsuhiro Ito
Ishibashi Masayuki
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