Aligned mounting of a photodetector array in a color splitting prism
AssigneeOy Ekspansio Engineering Limited
InventorsJyri Paavola, Lasse Lindström
Life of this patent
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Abstract
A joining construction is described for mounting the CCD cells of a color line camera on a color splitting prism (30) attached to a prism housing (2) for each CCD cell (6, 7, 8) attached by a first glue joint (13), to its fastening element (9), the length (L2) whereof is essentially larger than the length (L1) of the CCD cell, and which fastening element (9) extends from the housing margin (12a) located on one side of said exit surface (20a, 20b, 20c) of the color splitting prism to the other housing margin (12b) located on the opposite side thereof. Each fastening element (9) is attached to said margins by third glue joints (11).
Claims30
A joining construction for mounting CCD cells of a color line camera in an aligned fashion on a color splitting prism, which is attached to a prism housing, each of said CCD cells having a light receiving input window and an opposite rear surface, said joining construction comprising:
- fastening elements having a length substantially larger than the length of the CCD cell and extending from a housing margin on one side of a light exit surface of said color splitting prism to another housing margin on the opposite side of said light exit surface;
- a first glue joint between the CCD cell and its fastening element, said first glue joint extending along the rear surface of said CCD cell and being of a thermally conductive glue;
- and third glue joints abutting said fastening element and said margins of the housing, said third glue joints being of a thermally insulating glue or cast plastic.
A method for mounting CCD cells of a color line camera on a color splitting prism, which is in advance attached to a housing, the method of mounting each of the CCD cells having a light receiving input window and an opposite rear surface onto said prism comprising the steps of:
- creating a thermally conductive surface contact between the rear surface of the CCD cell and a fastening element that is essentially larger than the CCD cell by joining them together with a first thermally conductive glue provided therebetween;
- allowing said first glue to harden fixing the CCD cell to the fastening element;
- aligning the fastening element with the CCD cell fixed thereto at the correct position on said prism exit surface by moving said fastening element with respect to said housing;
- and
- gluing the fastening element, while maintaining the obtained alignment of the CCD cell, at least at two front surfaces located in the area of its outer margins and having areas substantially smaller than the area of the CCD cell, with a third glue abutting the prism housing.
A method for mounting CCD cells of a color line camera on a color splitting prism, which is in advance attached to a housing, the method of mounting each of the CCD cells onto said prism comprising the steps of:
- creating a thermally conductive surface contact between the CCD cell and a fastening element that is essentially larger than the CCD cell by joining them together with a first glue;
- aligning the fastening element with the CCD cell at the correct position on said prism exit surface;
- gluing the fastening element, while maintaining the obtained alignment of the CCD cell, at least at two front surfaces located in the area of its outer margins and having areas substantially smaller than the area of the CCD cell, with a third glue to the prism housing;
- creating a thermally conductive surface contact between heat distribution pieces and the ends of the fastening element by joining them together with a second glue;
- and
- attaching the heat distribution pieces to the prism housing in a heat-insulating fashion and in order to make the structure rigid.
Dependencies are inferred from the claim text.