Optical: systems and elements – Mirror – Concave cylindrical or providing a line focus
Patent
1990-03-19
1991-12-10
Arnold, Bruce Y.
Optical: systems and elements
Mirror
Concave cylindrical or providing a line focus
126438, 126442, 126443, 359852, 359869, 359894, 359514, G02B 510, F24J 224
Patent
active
050712438
ABSTRACT:
A generally rectangular tensioned cover comprises a pair of end forms having end portions. They are generally parallel along their lengths. A pair of side rails which are generally orthogonal to the end forms have first and second end portions. They are spaced substantially the lateral separation of the end forms with the end portions of each side rail positioned adjacent the end portions of an end form. A tensionable sheet spans from one side rail to the other and from one end form to the other. The sheet's first end portions are attached along the end forms. The lateral peripheral portions of the sheet are attached along the side rails. The end portion of the one end form is fastened to the first end portions of the side rails. The end portion of the other end form is fastened to selectable regions of the second end portions of the side rails. The sheet is tensioned longitudinally between the end forms.
REFERENCES:
patent: 4127926 (1978-12-01), White
patent: 4205659 (1980-06-01), Beam
patent: 4510923 (1985-04-01), Bronstein
patent: 4543946 (1985-10-01), Gill et al.
patent: 4561424 (1985-12-01), Gill et al.
patent: 4596238 (1986-06-01), Bronstein
patent: 4611575 (1986-09-01), Powell
Arnold Bruce Y.
Ryan J.
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