Patent ID: 8958027
Filing Date: 2015-02-17
Classification: G02B,G02F,H05K

Abstract:
1. A backplate assembly for accommodating and positioning an optical unit, comprising: a backplate, including a plate and a vertical lateral side which vertically surrounds the plate; the plate has a first surface and a second surface corresponding to the first surface; a plurality of cone-shaped holes, formed in the backplate, wherein each cone-shaped hole has a first opening and a second opening, the first opening is formed in the first surface, the second opening is formed in the second surface, and the first opening is smaller than the second opening; and a plurality of positioning columns, protruding from the first surface for positioning the optical unit; each positioning column has a column body part and a ring-shaped head part forming on an end of the column body; an external diameter of the ring-shaped head part is smaller than a diameter of the column body; the ring-shaped head part of each optical unit column inserts into each cone-shaped hole through the first opening; the ring-shaped head part is deformed outward by an external force so as to engage with the cone-shaped hole, such that the positioning column is fixed in the backplate; and the external diameter of the deformed ring-shaped head part is smaller than the diameter of the column body part, wherein the positioning columns at least includes an anchor rivet bolt, and the deformed ring-shaped head is engaged with the plate by an anchor rivet joint or a rotating rivet joint, the optical unit is a light guiding plate, and a distance between the column part and the vertical lateral side is approaching zero.