Illumination device and photographing apparatus having the same
First Claim
Patent Images
1. An illumination device comprising:
- a light source;
a first optical member having a total-reflection surface for totally reflecting at least a part of incident light, light emitted from said light source being made incident on said first optical member; and
a second optical member, light having exited from said first optical member being made incident on said second optical member, wherein said illumination device varies a state of illumination light by varying a positional relationship between said first optical member and said second optical member.
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Abstract
An illumination device includes a flash discharge tube, an optical prism having a total-reflection surface for totally reflecting at least a part of incident light, light emitted from the flash discharge tube being made incident on the optical prism, and an optical panel, light having exited from the optical prism being made incident on the optical panel, wherein the illumination device varies a state of illumination light by varying a positional relationship between the optical prism and the optical panel.
29 Citations
19 Claims
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1. An illumination device comprising:
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a light source;
a first optical member having a total-reflection surface for totally reflecting at least a part of incident light, light emitted from said light source being made incident on said first optical member; and
a second optical member, light having exited from said first optical member being made incident on said second optical member, wherein said illumination device varies a state of illumination light by varying a positional relationship between said first optical member and said second optical member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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4. An illumination device according to claim 1, wherein light emitted from the center of said light source and advancing to an exit surface of said first optical member is a parallel beam.
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5. An illumination device according to claim 1, wherein an exit surface of said first optical member is provided with a pattern having a predetermined refracting action, and said second optical member is provided with a pattern for substantially offsetting the refracting action of the exit surface of said first optical member at a predetermined position.
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6. An illumination device according to claim 5, wherein said light source has a cylindrical shape extending in a predetermined direction, and the exit surface of said first optical member has a refracting action in a direction perpendicular to the predetermined direction.
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7. An illumination device according to claim 6, wherein the exit surface of said first optical member is provided with a pattern in which a plurality of cylindrical lenses each having a refracting action within a plane perpendicular to the predetermined direction are arranged in a direction perpendicular to the predetermined direction, and wherein each of said plurality of cylindrical lenses has such a shape as to convert a parallel light beam into a plurality of convergent rays.
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8. An illumination device according to claim 7, wherein the following conditions are satisfied:
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9. An illumination device according to claim 6, wherein the exit surface of said first optical member is provided with a pattern in which a plurality of cylindrical lenses each having a refracting action within a plane perpendicular to the predetermined direction are arranged in a direction perpendicular to the predetermined direction, and wherein each of said plurality of cylindrical lenses has such a shape as to proportionally distribute a parallel light beam at a predetermined rate according to an incidence position thereof.
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10. An illumination device according to claim 5, wherein the exit surface of said first optical member has a refracting action varying according to a position thereof.
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11. An illumination device according to claim 1, wherein an exit surface of said first optical member is provided with a pattern having a predetermined refracting action, and said second optical member is provided with a pattern having such a shape as to substantially fit in with the exit surface of said first optical member.
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12. An illumination device according to claim 11, wherein said light source has a cylindrical shape extending in a predetermined direction, and the exit surface of said first optical member has a refracting action in a direction perpendicular to the predetermined direction.
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13. An illumination device according to claim 12, wherein the exit surface of said first optical member is provided with a pattern in which a plurality of cylindrical lenses each having a refracting action within a plane perpendicular to the predetermined direction are arranged in a direction perpendicular to the predetermined direction, and wherein each of said plurality of cylindrical lenses has such a shape as to convert a parallel light beam into a plurality of convergent rays.
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14. An illumination device according to claim 13, wherein the following conditions are satisfied:
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15. An illumination device according to claim 12, wherein the exit surface of said first optical member is provided with a pattern in which a plurality of cylindrical lenses each having a refracting action within a plane perpendicular to the predetermined direction are arranged in a direction perpendicular to the predetermined direction, and wherein each of said plurality of cylindrical lenses has such a shape as to proportionally distribute a parallel light beam at a predetermined rate according to an incidence position thereof.
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16. An illumination device according to claim 11, wherein the exit surface of said first optical member has a refracting action varying according to a position thereof.
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17. An illumination device according to claim 1, wherein said second optical member is provided, on at least a part of en exit surface thereof, with a Fresnel lens.
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18. An illumination device according to claim 1, further comprising:
a reflection member disposed on a side of said light source opposite to said first optical member, said reflection member having a reflecting surface in the shape of a circle in a predetermined section having a central point thereof set at the center of said light source.
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19. A photographing apparatus comprising:
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a photographic optical system; and
an illumination device according to claim 1, wherein said photographing apparatus varies a state of illumination light emitted from said illumination device, according to a state of said photographic optical system.
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Specification