US 6,632,004 B2Granted

Lighting device

AssigneeCanon Kabushiki Kaisha

InventorsSaburo Sugawara, Yoshiharu Tenmyo, Takayuki Uchida, Nobuhisa Kojima

Life of this patent

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Abstract

A lighting device is disclosed which comprises an illuminating light source for illuminating an object, a first optical unit disposed on the side of the object of the illuminating light source and having an optical action section for diverging light or an optical action section for converging light, and a second optical unit disposed on the side of the object of the optical action section of the first optical unit and having an optical action section for exhibiting a characteristic opposite to a characteristic of the optical action section, wherein the optical action section of the second optical unit overlies the optical action section of the first optical unit in varying areas to change light distribution characteristic on the side of the object.

Claims22

Dependent claims

A lighting device comprising:

an illuminating light source for illuminating an object;
a first optical unit disposed on the side of said object of said illuminating light source and having:
one of an optical action section for diverging light and an optical action section for converging light;
and
another section which is not formed in said optical action section;
and
a second optical unit disposed on the side of said object of said first optical unit and having an optical action section for exhibiting a characteristic opposite to a characteristic of said optical action section of said first optical unit, an area of the second optical unit being smaller than the sum of the areas of the second optical action section and said another section,
wherein by moving said second optical unit from a position where it overlaps with said optical action section to a position where it overlaps with said another section, changing the light distribution characteristics.

5 more elements

A lighting device comprising:

a discharge tube for illuminating an object;
a first optical unit disposed on the side of said object of said discharge tube and having one of a plurality of optical action sections for diverging light and a plurality of optical action sections for converging light;
and
another section which is not formed in said plurality of optical action sections, each of said plurality of optical action sections being extended in the longitudinal direction of said discharge tube, and being arranged together with a direction perpendicular to the longitudinal direction;
and
a second optical unit disposed on the side of said object of said first optical unit and having a plurality of optical action sections for exhibiting a characteristic opposite to a characteristic of said first optical unit, each of said plurality of optical action sections being extended in the longitudinal direction of said discharge tube, and being arranged together with a direction perpendicular to the longitudinal direction;
wherein said second optical unit in contrast to said first optical unit moves relative to the longitudinal direction on said discharge tube, changing the light distribution characteristics.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/017,163Filed 14 Dec 2001
Priority: JP 2000-39956127 Dec 2000
Published: US 2003/0007359 A19 Jan 2003
Granted: 14 Oct 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G03B 15/05
Combinations of cameras with lighting apparatus; Flash units: combinations of cameras with electronic flash apparatus; Electronic flash units
F21V 5/00
Refractors for light sources
F21V 7/0091
Reflectors for light sources: using total internal reflection
F21V 13/04
Combinations of only two kinds of elements: the elements being reflectors and refractors