IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0277905
(1981-06-26)
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발명자
/ 주소 |
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출원인 / 주소 |
- Mobil Solar Energy Corporation
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
14 인용 특허 :
1 |
초록
▼
A solar cell having a periodic front surface electrode is provided with a transparent cover chosen and configured to provide refractive discontinuities of the same spatial frequency as and aligned with the conductive grid. The refractive discontinuities are so controlled, through selection of the sh
A solar cell having a periodic front surface electrode is provided with a transparent cover chosen and configured to provide refractive discontinuities of the same spatial frequency as and aligned with the conductive grid. The refractive discontinuities are so controlled, through selection of the shape, disposition, and refractive index of the cover, as to cause a ray initially normal to the surface of the cell which would otherwise be intercepted by the electrode to miss the electrode and fall on the photosensitive material.
대표청구항
▼
1. A solar cell assembly comprising in combination a solar cell for generating an electrical current in response to electromagnetic radiation, said cell having a front surface and an electrode obscuring a plurality of regions of said front surface, said regions each having a characteristic dimens
1. A solar cell assembly comprising in combination a solar cell for generating an electrical current in response to electromagnetic radiation, said cell having a front surface and an electrode obscuring a plurality of regions of said front surface, said regions each having a characteristic dimension in a first direction and being spaced from one another along said first direction in a predetermined spatial frequency, said electrode comprising a comb-like array of equally spaced-apart like conductors; a transparent front cover of predetermined refractive index having opposed first and second surfaces, said first surface facing said front surface of said cell and confronting a medium having a refractive index different from said predetermined refractive index, said first surface having a contour comprising a plurality of substantially identical cylindrical segments having a like plurality of substantially cylindrical axes, adjacent ones of said cylinder axes being spaced apart a distance similar to that between adjacent ones of said conductors, each of said cylinder axes being disposed (a) in a plane substantially parallel to said conductors, (b) parallel to individual conductors, and (c) equidistant from an adjacent pair of said conductors, said cylinders being dimensioned and disposed so that selected rays of said radiation incident upon them are deflected through a predetermined angle and directed to regions of said front surface which are not obscured by said electrode, and said second surface being a substantially planar surface parallel to said cylinder axes; and means securing said front cover to said cell in overlaying relation to said front surface with said first surface positioned at a predetermined distance from said electrode. 2. The assembly according to claim 1 wherein said cylindrical segments are convex with regard to said planar surface and the medium confronting said first surface is of lower refractive index than said predetermined refractive index. 3. A solar cell assembly comprising in combination a solar cell for generating an electrical current in response to electromagnetic radiation, said cell having a front surface and an electrode obscuring a plurality of regions of said front surface, said regions each having a characteristic dimension in a first direction and being spaced from one another along said first direction in a predetermined spatial frequency, said electrode comprising a comb-like array of equally spaced-apart parallel like conductors; a transparent front cover of predetermined refractive index having opposed first and second surfaces, both of said first and second surfaces confronting a medium having a refractive index different from said predetermined refractive index, said first and second surfaces having first and second contours respectively, each of said contours being in the form of a plurality of substantially identical cylindrical segments having a like plurality of substantially coplanar cylinder axes, adjacent ones of said cylinder axes being spaced apart a distance similar to that between adjacent ones of said conductors, each of said cylinder axes being disposed (a) in a plane substantially parallel to said conductors, (b) parallel to individual conductors, and (c) equidistant from an adjacent pair of said conductors, said cylinders being dimensioned and disposed so that selected rays of said radiation incident upon said cylinders are directed to regions of said front surface which are not obscured by said electrode; and means for securing said front cover to said cell in overlaying relation to said front surface so as to maintain said first and second surfaces at predetermined distances from said front surface. 4. The assembly according to claim 3 wherein said cylindrical segments forming said first contour are convex, said cylindrical segments forming said second contour are concave, and further wherein said second surface faces said front surface of said cell and the medium confronting said second-surface is of lower refractive index than said predetermined refractive index. 5. The assembly according to claim 4 wherein said second surface includes a plurality of planar sections parallel said cylinder axes, each of said planar sections extending between a pair of said cylindrical sections, and each of said planar sections having an extent in said first direction substantially equal to said characteristic dimension. 6. The assembly according to claim 3 wherein the cylindrical segments defining said first contour are substantially identical to the cylindrical segments defining said second contour. 7. A solar cell assembly comprising in combination a solar cell for generating an electrical current in response to electromagnetic radiation, said cell having a front surface and an electrode obscuring a plurality of regions of said front surface, said regions each having a characteristic dimension in a first direction and being spaced from one another along said first direction in a predetermined spatial frequency, said electrode comprising a comb-like array of equally spaced-apart parallel like conductors; a transparent front cover of predetermined refractive index having opposed first and second surfaces, said first surface confronting a medium having a refractive index different from said predetermined refractive index, said first surface having a contour, said contour having a spatial frequency along said first direction corresponding to the spatial frequency of said regions, said contour including a plurality of pairs of cylindrical segments, each segment having an axis substantially parallel to said conductors, each pair being disposed such that the segments intersect in a line substantially in opposing relationship to a one of said conductors, said cylindrical elements being dimensioned so that selected rays of said radiation incident near said lines are deflected through a predetermined angle and directed to regions of said front surface which are not obscured by said electrode; and means for securing said front cover to said cell in overlaying relation to said front surface so as to maintain said first surface at a predetermined distance from said electrode with said lines in a selected alignment with said regions, said predetermined distance being selected so that no less than one half of said characteristic dimension subtends said predetermined angle at said predetermined distance, and said alignment being selected to that said regions and zones are disposed along a path parallel to an incident ray of said radiation. 8. The assembly according to claim 7 wherein said axes are disposed to be nearer said conductors than to a line midway between adjacent said conductors. 9. The assembly according to claim 8 wherein said contour includes a plurality of substantially planar sections tangent to and connecting adjacent ones of said first plurality. 10. A solar cell assembly comprising in combination a solar cell for generating an electrical current in response to electromagnetic radiation, said cell having a front surface and an electrode obscuring a plurality of regions of said front surface, said regions each having a characteristic dimension in a first direction and being spaced from one another along said first direction in a predetermined spatial frequency, said electrode comprising a comb-like array of spaced-apart like conductors; a transparent front cover of predetermined refractive index having opposed first and second surfaces, said first surface at least in part confronting a medium having a refractive index different from said predetermined refractive index, said first surface having a contour comprising a plurality of spaced-apart identical prismatic sections, each of said sections being defined by a pair of intersecting lateral faces disposed to make equal but opposite angles, each greater than the critical angle, with a plane parallel said front surface, said pair of lateral faces intersecting along a line which is parallel to and centered opposite one of said conductors, said contour having a spatial frequency along said first direction corresponding to the spatial frequency of said regions, said lateral faces being dimensioned and disposed so that selected rays of said radiation incident upon said lateral faces are deflected through a predetermined angle and directed to regions of said front surface which are not obscured by said electrode, the projection of each of said prismatic sections on a plane parallel to said lines having a size along said first direction substantially the same size as said characteristic dimension, said first surface also including a plurality of planar sections parallel to said planar surface, each of said planar sections extending between a pair of said prismatic sections on a plane parallel to said lines, each said planar section having a size along said first direction substantially the same as the separation between adjacent said conductors, and said second surface being a substantially planar surface parallel to said lines and spaced apart from said first surface; and means securing said front cover to said cell in overlaying relation to said front surface with said first surface facing said front surface so as to maintain said first surface at a predetermined distance from said electrode with said prismatic sections in a selected alignment with said regions, said predetermined distance being selected so that no less than one half of said characteristic dimension subtends said predetermined angle at said predetermined distance, said alignment being selected so that said regions and zones are disposed along a path parallel to an incident ray of said radiation.
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