Illumination devices and optical fibres for use therein
First Claim
1. An illumination device comprising an illumination device for propagating light in a preselected direction, said fibre having a light emitting region, said light emitting region comprising a plurality of reflecting surfaces of optical quality extending into said fibre and arranged such that a portion of light propagating along said fibre and impinging upon said surfaces will be reflected out of said fibre by total internal reflection through a side wail thereof, at least one of said reflecting surfaces having a cross-sectional area less than that of said fibre, said reflecting surfaces varying in cross-sectional area and/or spacing such that light is emitted over said light emitting region substantially uniformly.
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Reexamination
Accused Products
Abstract
An optical fibre has a light emitting region. In the light emitting region are reflecting surfaces, at least one of which has a cross sectional area less than that of the fibre. Light striking the reflecting surfaces will be reflected out of the fibre.
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Citations
21 Claims
- 1. An illumination device comprising an illumination device for propagating light in a preselected direction, said fibre having a light emitting region, said light emitting region comprising a plurality of reflecting surfaces of optical quality extending into said fibre and arranged such that a portion of light propagating along said fibre and impinging upon said surfaces will be reflected out of said fibre by total internal reflection through a side wail thereof, at least one of said reflecting surfaces having a cross-sectional area less than that of said fibre, said reflecting surfaces varying in cross-sectional area and/or spacing such that light is emitted over said light emitting region substantially uniformly.
- 17. An illumination device comprising an illumination device for propagating light in a preselected direction, said fibre having a light emitting region, said light emitting region comprising a plurality of reflecting surfaces of optical quality extending into said fibre and arranged such that a portion of light propagating along said fibre and impinging upon said surfaces will be reflected out of said fibre by total internal reflection through a side wall thereof, said reflecting surfaces having cross-sectional areas that vary such that the amount of light reflected out of said fibre by each of said reflecting surfaces is substantially equal.
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19. An illumination device comprising a plurality of illumination devices for propagating light in a preselected direction, said fibres being aligned to form an array, said array having a light emitting region wherein each of said fibres has a plurality of reflecting surfaces of optical quality extending therein such that a portion of light propagating along any fibre of the array and impinging on said reflecting surfaces will be reflected out of its fibre by total internal reflection wherein the cross-sectional area of said reflecting surfaces increases as distance along said fibres increases in said preselected direction.
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20. An illumination device comprising a plurality of illumination devices for propagating light in a preselected direction, said fibres being aligned to form an array, said array having a light emitting region wherein each of said fibres has a plurality of reflecting surfaces of optical quality extending therein such that a portion of light propagating along any fibre of the array and impinging on said reflecting surfaces will be reflected out of its fibre by total internal reflection wherein the cross-sectional area of said reflecting surfaces varies such that the amount of light reflected out of each fibre by each of said reflecting surfaces is substantially equal.
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21. An illumination device comprising a plurality of illumination devices for propagating light in a preselected direction, said fibres being aligned to form an array, said array having a light emitting region wherein each of said fibres has a plurality of reflecting surfaces of optical quality extending therein such that a portion of light propagating along any fibre of the array and impinging on said reflecting surfaces will be reflected out of its fibre by total internal reflection wherein the cross-sectional area of the said reflecting surfaces and/or the spacing between said reflecting surfaces varies such that the light emitted over said light emitting region is substantially uniform.
Specification