Bonding tool for ultrasonic bonding and method of ultrasonic bonding
AssigneeFujitsu Limited
InventorsKenji Kobae, Takashi Kubota
Life of this patent
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Abstract
Changes in the form of a pressure welding part of a bonding tool for ultrasonic bonding due to abrasion of the pressure welding part and/or accumulation of foreign matter, such as plating material, on the pressure welding part during use of the bonding tool are prevented, so that the bonding tool can carry out ultrasonic bonding stably. A plurality of protrusions with curved outer surfaces are formed on the pressure welding part that contacts the bonded part during ultrasonic bonding. The protrusions can be formed with spherical outer surfaces by forming concave grooves in a grid in an end surface of the bonding tool and then sandblasting the end surface of the bonding tool.
Claims12
A bonding tool for ultrasonic bonding, comprising:
- a pressure welding part that contacts a bonded part during the ultrasonic bonding;
- and
- a plurality of protrusions with curved outer surfaces that are formed on the pressure welding part.
A method of ultrasonic bonding that ultrasonically bonds a bonded part using a bonding tool for ultrasonic bonding including a pressure welding part that contacts a bonded part during the ultrasonic bonding and a plurality of protrusions with curved outer surfaces that are formed on the pressure welding part, the method comprising a step of bonding that applies ultrasound in a state where the pressure welding part of the bonding tool has been placed in contact with the bonded part and gradually increases a pressing force applied onto the bonded part by the bonding tool from a start of bonding.
A method of manufacturing a carriage assembly used in a magnetic disk apparatus using an ultrasonic bonding apparatus in which a bonding tool for ultrasonic bonding, which includes a pressure welding part that contacts a bonded part during the ultrasonic bonding and a plurality of protrusions with curved outer surfaces that are formed on the pressure welding part, is attached to a horn, the method of manufacturing comprising:
- a step of positioning a carriage arm and a flexible circuit board;
- and
- a step of ultrasonically bonding electrical connecting parts of the carriage arm and the flexible circuit board using the bonding tool.
Dependencies are inferred from the claim text.