Rohm Co., Ltd.

Yasukazu Kondo

Takeshi Kitamura

A pinprovided at a hornfor ultrasonic welding is press-fitted to the depth reaching the light guide platebreaking through the various kind of sheetsandfrom surface side thereof. Another embodiment of the invention is that pinsconstructed so as to break through various kind of sheetsandon the surface of the plate are provided on the light guide plate, and the various kind of sheetsandare fixed on the light guide plateby distorting by caulking using ultrasonic vibration of the tip end of the pin.

Back light unit for liquid crystal display device and method for manufacturing the unit

A pinprovided at a hornfor ultrasonic welding is press-fitted to the depth reaching the light guide platebreaking through the various kind of sheetsandfrom surface side thereof. Another embodiment of the invention is that pinsconstructed so as to break through various kind of sheetsandon the surface of the plate are provided on the light guide plateand the various kind of sheetsandare fixed on the light guide plateby distorting by caulking using ultrasonic vibration of the tip end of the pin.

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Kyoto, Japan

Yasukazu Kondo