Title:
ILLUMINATION DEVICE
Document Type and Number:
Japanese Patent JP2019132870
Kind Code:
A
Abstract:
To provide an optical system that has a miniaturized and simple mechanism, and is excellent in optical characteristics, and in particular, to provide an illumination device that causes distribution light on a wide-angle side to be efficiently diffused.SOLUTION: In a zoom strobo device comprising: a light emission member that is composed of a reflection umbrella, and a flash discharge tube; and an optical panel that is in front of a rectangular opening part of the reflection umbrella, in which a change of a separated space between the optical panel and the light emission member causes an irradiation angle to change, a Fresnel lens with positive refractive power in which an angle of a microlens surface successively changes is formed on a subject side of the optical panel, and the Fresnel lens with negative refractive power is formed on one piece of the optical panel in at least an area around a center on a light emission unit side of a rear surface of the optical panel.SELECTED DRAWING: Figure 1
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Inventors:
OKANO YOSHINOBU
TENMYO RYOJI
TENMYO RYOJI
Application Number:
JP2018012153A
Publication Date:
August 08, 2019
Filing Date:
January 29, 2018
Export Citation:
Assignee:
CANON KK
International Classes:
G03B15/05; G02B3/08; G03B15/02
Attorney, Agent or Firm:
Yukio Takanashi