Method for cutting thin film filter work pieces
AssigneeHon Hai Precision Ind. Co., Ltd.
InventorCharles Leu
Life of this patent
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Abstract
A method for cutting thin film filter work pieces has two embodiments. In a first embodiment, an intermediate layer (13) binds an augmenting substrate (14) to a glass substrate (12) of the work piece (16) prior to cutting of the work piece. In a second embodiment, the work piece (23) comprises a glass substrate (22) which is thicker than a final desired thickness. After the work piece is cut, a surplus portion (222) of the glass substrate is removed. Both embodiments of the method increase the effective thickness of the work piece, which reduces the residual stress in the final thin film filter product, and reduces the risk of a film stack (11, 21) of the work piece peeling from the glass substrate during the cutting process.
Claims17
A method for cutting a thin film filter work piece, the work piece comprising a glass substrate and a film stack, the method comprising the steps of:
- providing an augmenting substrate;
- coating an intermediate layer on a top surface of the augmenting substrate;
- mounting the work piece onto the intermediate layer;
- removing air bubbles from the intermediate layer, and making the film stack, glass substrate, intermediate layer and augmenting substrate substantially parallel;
- allowing the intermediate layer that binds the augmenting substrate to the work piece to harden;
- cutting the combined film stack, glass substrate, intermediate layer and augmenting substrate into pieces;
- and
- removing an intermediate layer piece and an augmenting substrate piece from each of the cut pieces.
A method for cutting a thin film filter work piece, the work piece comprising a glass substrate and a film stack, the method comprising the steps of:
- providing the work piece such that its glass substrate is thicker than a final desired thickness;
- cutting the work piece into pieces, each piece having a film stack piece and a glass substrate piece;
- pushing the cut pieces together into a plate so that the cut pieces hold their same relative positions to one another as they had in the original, uncut work piece;
- clamping the plate in a chuck and supporting the plate upside-down on a support;
- and
- removing a surplus portion of each glass substrate piece from each cut piece.
A method for making a thin film filter piece with reduced stress-induced peak insertion loss, comprising the steps of:
- providing a glass substrate with a film stack applied thereon, said glass substrate defining a thickness which is larger than a desired one of a final finished film filter piece for use;
- cutting said glass substrate with the associated film stack thereon into pieces each with desired planar dimensions;
- and
- removing a portion of said glass substrate of each of said pieces opposite to said film stack so as to obtain said desired thickness thereof.
Dependencies are inferred from the claim text.