Illuminating system for camera
View Patent ↗An illuminating system for a camera that can illuminate an area according to an angle of view of the camera for stroboscopy is provided. The illuminating system includes: a light source emitting light; and an illuminating lens arranged in an optical path of the light emitted from the light source and having a fly-eye lens surface with a plurality of lens cells thereon and an aspherical or spherical lens surface opposite to the fly-eye lens surface.
1. An illuminating system for a camera, comprising:
a light source disposed immediately preceding a monolithic illuminating lens, the light source emitting light; and
the monolithic illuminating lens arranged in an optical path of the light emitted from the light source and having a fly-eye lens surface with a plurality of lens cells thereon immediately preceding one of an aspherical and spherical lens surface opposite to the fly-eye lens surface, wherein the emitted light is substantially received directly by the fly-eye lens surface from the light source, wherein the illuminating system satisfies the condition:
15
°
≤
tan
-
1
d
D
≤
31
°
where d is a height of each of the lens cells, and D is a distance between the light source and the fly-eye lens surface.
2. The illuminating system of claim 1 , wherein the monolithic illuminating lens is comprised of a plurality of lenses.
3. The illuminating system of claim 1 , wherein the monolithic illuminating lens is arranged such that the fly-eye lens surface faces the light source.
4. The illuminating system of claim 1 satisfying the condition:
T
R
≤
1.5
where T is a thickness of the monolithic illuminating lens, and R is a radius of curvature of each of the lens cells.
5. The illuminating system of claim 4 , wherein each of the lens cells has a square shape when viewed from the light source.
6. The illuminating system of claim 4 wherein the light source is at least one light emitting diode (LED).
7. The illuminating system of claim 1 wherein each of the lens cells has a square shape when viewed from the light source.
8. The illuminating system of claim 1 satisfying the condition:
T
R
≤
1.5
where T is a thickness of the monolithic illuminating lens, and R is a radius of curvature of each of the lens cells.
9. The illuminating system of claim 8 , wherein each of the lens cells has a square shape when viewed from the light source.
10. An illuminating apparatus for an image processing device, the apparatus comprising:
a light source disposed immediately preceding a monolithic illuminating lens, the light source emitting light; and
the monolithic illuminating lens arranged in an optical path of the light emitted from the light source, the monolithic illuminating lens having a fly-eye lens surface with a plurality of lens cells thereon that separately converge incident light and one of an aspherical and spherical lens surface immediately following and opposite to the fly-eye lens surface, wherein emitted light is substantially received directly by the fly-eye lens surface from the light source, and wherein the plurality of lens cells are substantially convex and rectangular shaped, and the illuminating apparatus satisfies the condition:
15
°
≤
tan
-
1
d
D
≤
31
°
where d is a height of each of the lens cells, and D is a distance between the light source and the fly-eye lens surface.
11. An illumination method for improving the brightness and uniformity of light incident upon an image processing apparatus, the method comprising:
receiving light from a light source;
providing a monolithic illuminating lens disposed immediately following the light source such that the monolithic illuminating lens receives the light directly from the light source, the monolithic illuminating lens having a fly-eye lens surface having a plurality of adjacent lens cells thereon each of which is substantially convex in shape and each of which separately converges incident light, and immediately following the fly-eye lens surface one of a substantially aspherical and substantially spherical surface that converges incident light; and
arranging the monolithic illuminating lens in an optical path of the light emitted from the light source wherein the fly-eye lens surface faces the emitted light and the emitted light is substantially received directly by the fly-eye lens surface from the light source,
wherein the illumination method satisfies the condition:
15
°
≤
tan
-
1
d
D
≤
31
°
where d is a height of each of the lens cells, and D is a distance between the light source and the fly-eye lens surface.
12. The illuminating method of claim 11 satisfying the condition:
T
R
≤
1.5
where T is a thickness of the monolithic illuminating lens, and R is a radius of curvature of each of the lens cells.
13. The illuminating method of claim 12 wherein the light source is at least one light emitting diode (LED).
14. The illuminating method of claim 12 , wherein each of the lens cells has a square shape when viewed from the light source.
15. The illuminating method of claim 11 satisfying the condition:
T
R
≤
1.5
where T is a thickness of the monolithic illuminating lens, and R is a radius of curvature of each of the lens cells.
16. The illuminating method of claim 15 , wherein each of the lens cells has a square shape when viewed from the light source.