摘要:
Determination of the height difference between a first reference point and a second reference point, at least one of the two reference points lying on a semiconductor chip, which is mounted on a substrate, comprises the stepsA) recording a first image from a first direction, which runs diagonally to the surface of the substrate at a predetermined angle α2, the substrate and the semiconductor chip being illuminated from a second direction which runs diagonally to the surface of the substrate at a predetermined angle α3, a telecentric optics being located in the beam path, B) recording a second image from the second direction, the substrate and the semiconductor chip being illuminated from the first direction, either the cited telecentric optics or a further telecentric optics being located in the beam path, C) ascertaining a first coordinate of the position of the first reference point and a first coordinate of the position of the second reference point in the first image and determining a first difference between these two coordinates, D) ascertaining a first coordinate of the position of the first reference point and a first coordinate of the position of the second reference point in the second image and determining a second difference between these two coordinates, and E) calculating the height difference from the first difference and the second difference.
摘要:
The invention relates to a method for picking up semiconductor chips from a wafer table and, optionally, their mounting on a substrate by means of a pick-and-place system. The position and orientation of the semiconductor chip to be mounted next are determined by means of a first camera and made available in the form of positional data relating to a first system of coordinates. The position and orientation of the substrate place on which the semiconductor chip will be mounted are determined by means of a second camera and made available in the form of positional data relating to a second system of coordinates. The conversion of coordinates of the first or second system of coordinates into coordinates of motion of the pick-and-place system occurs by means of two fixed mapping functions and two changeable correction vectors. The correction vectors are readjusted on the occurrence of a predetermined event.
摘要:
The invention relates to a method for picking up semiconductor chips from a wafer table and, optionally, their mounting on a substrate by means of a pick-and-place system. The position and orientation of the semiconductor chip to be mounted next are determined by means of a first camera and made available in the form of positional data relating to a first system of coordinates. The position and orientation of the substrate place on which the semiconductor chip will be mounted are determined by means of a second camera and made available in the form of positional data relating to a second system of coordinates. The conversion of coordinates of the first or second system of coordinates into coordinates of motion of the pick-and-place system occurs by means of two fixed mapping functions and two changeable correction vectors. The correction vectors are readjusted on the occurrence of a predetermined event.
摘要:
A Die Bonder or a Wire Bonder contains a device for holding down a substrate. The device comprises a table with drill holes. The drill holes are mechanically programmable with regard to whether vacuum can be applied to them or not. The mechanical programming enables a fast and easy adaptation of the device to different substrates.
摘要:
The detachment and removal of a semiconductor chip from a foil occurs in accordance with the invention in three phases. In the first phase there is a partial detachment of the semiconductor chip from the foil with mechanical means, but without the participation of a chip gripper. In the second phase the semiconductor chip is further detached from the foil, with the semiconductor chip being held by the chip gripper. In the third phase the chip gripper is lifted and moved away.
摘要:
A Die Bonder or Wire Bonder has a suction device for pulling flat and holding down a curved substrate equipped with or to be equipped with a semiconductor chip onto a supporting surface of a plate. The plate contains at least one cavity open towards the supporting surface in which there is a vacuum gripper made out of flexible material, whereby the vacuum gripper is lowerable into the cavity during transport of the substrate and which is raisable above the level of the supporting surface to apply suction to the substrate.
摘要:
The detachment and removal of a semiconductor chip from a foil occurs in accordance with the invention in three phases. In the first phase there is a partial detachment of the semiconductor chip from the foil with mechanical means, but without the participation of a chip gripper. In the second phase the semiconductor chip is further detached from the foil, with the semiconductor chip being held by the chip gripper. In the third phase the chip gripper is lifted and moved away.
摘要:
In order to eliminate the inclination of a semiconductor chip picked by a gripper, the height of at least three points on the underneath of the semiconductor chip is determined in relation to a reference surface and from this the inclination is calculated. Determining the heights takes place in that the semiconductor chip is lowered until the semiconductor chip comes into contact with a needle.
摘要:
In order to eliminate the inclination of a semiconductor chip picked by a gripper, the height of at least three points on the underneath of the semiconductor chip is determined in relation to a reference surface and from this the inclination is calculated. Determining the heights takes place in that the semiconductor chip is lowered until the semiconductor chip comes into contact with a needle.