Title:
ILLUMINATION DEVICE
Document Type and Number:
Japanese Patent JP2017003671
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an illumination device that can change a light irradiation range and can suppress a reduction in intensity of light when the irradiation range is narrowed, while suppressing an increase in size of the device.SOLUTION: There is provided an illumination device that can change a light irradiation range and comprises a light emitting part and an optical member arranged in front of the light emitting part, wherein the optical member has a plurality of shapes in which two types of cylindrical concave surfaces having axial directions substantially orthogonal to each other are overlapped with each other, in a central area of an incident surface on which light from the light emitting part is made incident or a central area of an emission surface from which the light made incident on the incident surface is emitted.SELECTED DRAWING: Figure 3
Inventors:
OKANO YOSHINOBU
Application Number:
JP2015115231A
Publication Date:
January 05, 2017
Filing Date:
June 05, 2015
Export Citation:
Assignee:
CANON KK
International Classes:
G03B15/05; F21V5/04; F21V14/00; F21V14/02; G03B15/02; H04N5/225; H04N5/238
Domestic Patent References:
| JPH1165030A | 1999-03-05 | |||
| JP2008020609A | 2008-01-31 | |||
| JP2001337372A | 2001-12-07 |
Attorney, Agent or Firm:
Takuma Abe
Sogo Kuroiwa
Sogo Kuroiwa
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