摘要:
The picking of a semiconductor chip from a foil takes place by means of a chip gripper which bears on a bondhead and can be deflected in a predetermined direction and with the aid of a needle. An inductive sensor serves the precise measurement of the deflection of the chip gripper with reference to the bondhead. The pick process itself is characterised by the following steps: a) Lowering the chip gripper to a height z0, that is greater than an average height of the surface of the semiconductor chips so that the chip gripper does not yet touch the semiconductor chip, b) Raising the needle to a predetermined height z1, whereby the needle raises the semiconductor chip in order to bring the semiconductor chip into contact with the chip gripper and then to increase the height of the chip gripper, and c) Raising the chip gripper, whereby the semiconductor chip detaches itself from the needle.
摘要:
For dispensing solder on a substrate, a soldering wire and a forming gas heated to a predetermined temperature are fed to a mixing chamber of a two-component nozzle so that, in the mixing chamber, solder is melted off and carried with the gas stream. The solder blown out of the two-component nozzle settles on the substrate. The two-component nozzle is moved or swivelled relative to the substrate in order to distribute the solder over a predetermined area of the substrate.
摘要:
In order that, on wire bonding by means of a Wire Bonder, optimum bonding results can be achieved after a capillary change it is suggested that, after a change from a first capillary to a second capillary, the ultrasonic transducer which applies ultrasonics to the horn which guides the capillary is controlled with a parameter P2 which results from the parameter P1 before the capillary change as P2nullg(k1, k2)*P1 or P2nullg(k1, k2, A1, A2)*P1 or P2nullg(k1, k2, A1, A2, H1, H2)*P1, whereby the quantities k1 and k2 designate the estimated values for the flexural strength, the quantities A1 and A2 the amplitudes of the freely oscillating capillary and H1 and H2 the diameters in the narrowest part of the longitudinal drill hole of the first or second capillary and whereby the function g is a predetermined function.
摘要:
An apparatus for the transport and equipping of substrates with semiconductor chips comprises a channel with two side walls in which the substrates are transported in a transport direction. The apparatus has at least one comb which can be raised and lowered in order to move the substrates in transport direction as well as resiliently mounted elements which press against the substrates.
摘要:
An apparatus for placing a semiconductor chip as a flipchip on a substrate has a flip device for flipping the semiconductor chip. The flip device is formed as a parallelogram construction which consists of a support bracket, a first and a second swivel arm and a connecting arm. A chip gripper is arranged on the connecting arm. A drive system serves the back and forth movement of the parallelogram construction between a first limit position where the chip gripper accepts the semiconductor chip and a second limit position where the chip gripper places the semiconductor chip on the substrate.
摘要:
The bondhead of a Wire Bonder, that serves to produce a wire connection between two connection points by means of a capillary guiding a wire, is formed as a pantograph mechanism. The pantograph mechanism comprises a first swivel arm driven by a first motor, a second swivel arm driven by a second motor and two connecting arms. With this pantograph mechanism, the movement of the capillary takes place by means of rotary movements.
摘要:
A clamping element for the transport of a substrate in a predefined transport direction comprises a first and a second leg with a first and second clamping jaw for clamping a substrate. Each of the two clamping jaws has a clamping plate which is movable in transport direction relative to the corresponding leg. A sensor measures the deflection of the first clamping plate relative to the first leg. As soon as the measured deflection exceeds a predefined threshold value, the clamping element is opened.
摘要:
Optimum bond parameters for a bond force FB and an ultrasonic variable P and, optionally, at least one further bond parameter of a Wire Bonder can be determined by means of a method with the following steps: a) Carrying out several bonding operations, with which an end of a wire formed into a ball is bonded onto a connection point, whereby the bond force FB and the ultrasonic variable P and, if necessary, the at least one further bond parameter are each varied in discrete steps in a predefined range, whereby during bonding, for each bonding operation an electrical signal is produced by means of a sensor which is proportional to a shear force exerted on the corresponding connection point, b) for each bonding operation, determining a quantity G from the electrical signal delivered by the sensor during the bonding operation, c) Determining the maximum value of the quantity G and the corresponding values for the bond force FB, the ultrasonic variable P and, if necessary, the at least one further bond parameter or determining a global maximum of the quantity G and determining the corresponding values for the bond force FB, the ultrasonic variable P and, if necessary, the at least one further bond parameter or determining a parameter range H for the quantity G in which the quantity G fulfills predefined criteria, and determining a value for the bond force FB, the ultrasonic variable P and, if necessary, the at least one further bond parameter, which lie in the parameter range H.
摘要:
A pressure sensor for measuring a pressure p contains a membrane with a front and a rear clamped into a body. The pressure p can be applied to the rear of the membrane. The front of the membrane is actively linked to a piston. In addition, a force transmitter is present with which a predetermined force can be applied to the piston. For the purpose of re-calibration, the membrane of the pressure sensor can be deformed by the force transmitter under precisely defined conditions and the output signal re-calibrated. A positioner can also be foreseen instead of the force transmitter.
摘要:
A method for checking the quality of a wedge bond between a wire loop and a connection point on a substrate, whereby the wire loop was formed by means of a capillary of a Wire Bonder, is characterised by the following steps: Placing the capillary at a side of the wire loop and next to the wedge bond, whereby the tip of the capillary is located below the level of the wire loop. Moving the capillary parallel to the surface of the substrate and orthogonally to the wire loop until the wedge bond tears away from the connection point or the wire breaks, and simultaneously measuring a signal that is a measure for a force exerted by the capillary on the wire loop, and Determining the maximum of the measured signal.