Patent ID: 8450137

Claim:
A method for reducing the tilt of a transparent window during manufacturing of an image sensor, comprising the following steps: providing a semimanufacture of the image sensor, which comprises a circuit substrate and an image sensor die, wherein the circuit substrate has a supporting surface and a bottom surface, a plurality of first conductive contacts are provided on the supporting surface, and the image sensor die comprises: a first surface attached to the supporting surface; a second surface having a photosensitive region; and a plurality of second conductive contacts disposed outside the photosensitive region and electrically connected to the first conductive contacts via metal wirings respectively; carrying out a preheating process by placing the semimanufacture into an environment at a specific temperature; carrying out an adhesive spreading process by, after the preheating process, spreading an adhesive onto the second surface around the photosensitive region without covering the photosensitive region; carrying out a transparent window closing process by, after the adhesive spreading process, placing a transparent window on the adhesive and curing the adhesive to fix the transparent window onto the second surface and to form an air chamber between the image sensor die and the transparent window; and carrying out a packaging process by packaging the semimanufacture and the transparent window with an encapsulant.