RS-1_instruction manual.pdf - 第975页
Part 2 D etaile d Descript ion of E ach Functi on Chapter 12 Handling th e Optional Device s 12 - 91 12.14.2 Items t o be inspect ed with a copl anarity ch eck 12.14.2.1 Colinearity check This check inspe cts whet her a …
Part 2 Detailed Description of Each Function Chapter 12 Handling the Optional Devices
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When you use a coplanarity sensor, you have to operate the key for the coplanarity sensor. Insert
the key into the machine, and turn it counterclockwise. The coplanarity sensor can be used.
◇ When the coplanarity sensor can be used
◇ When the coplanarity sensor cannot be used
The coplanarity sensor uses a Laser Class 3B product.
Exposure of an eye or skin to a laser beam is dangerous. Never look
directly at a laser beam nor touch it.
When the cover is opened, you cannot use the coplanarity sensor even
though the machine is in Maintenance mode. The sensor neither scans
nor radiates laser.
If you control or adjust the unit according to a procedure other than that
regulated in this document, it may expose you to dangerous laser radiation.
DANGER
CAUTION
CAUTION
Coplanarity key
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12.14.2 Items to be inspected with a coplanarity check
12.14.2.1 Colinearity check
This check inspects whether a side on which a lead is located is “bent upwards or downwards.”
◇ This check is run with “one scanning operation.” For example, each of “four sides of a 4-side
element such as a QFP” or each of “two sides of a 2-side element such as an SOP” is
inspected with one scanning operation.
“Colinearity” means parallelism.
A colinearity check can be run for a lead component only.
12.14.2.2 Coplanarity check
To calculate coplanarity, two methods are provided:
Coplanarity (uniformity of the bottom of a terminal) of a QFP/SOP can be calculated with the 3-point
method (JEDEC standard: JESD22-B108A) or the least-square method (JEDEC standard:
JESD22-B108A).
■ The 3-point method is selected at the factory.
This setting can be changed on the “Machine Setup” screen (See Section 8.3.6.8
“Coplanarity”).
◇ Coplanarity of a QFP or an SOP can be calculated with the 3-point method or the least-square
method.
◇ Coplanarity of a ball component can be calculated with the least-square method.
Measurement line
This lead is bent downwards
Element to be checked
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◆ Coplanarity of a lead component obtained with the 3-point method (default)
In the geometric plane passing the lowest points of arbitrary three terminals, all the lowest
points of the other terminals exist on the package side and the center of gravity of the
package is included within or on sides of the triangle comprised of these three points. When
the plane satisfies the above condition and has no effect of the empty weight, it is defined as
coplanarity.
If there are multiple combinations that satisfy the above condition, adopt a combination in
which the coplanarity value becomes large.
◆ Coplanarity of a lead component obtained with the least-square method
In case of the least-square method, when the plane obtained by the least-square method from
the lowest points of all the terminals is in contact with the lowest point of the most distant
terminal from the package side, the distance up to the most distant terminal is defined as
coplanarity.
◆ Coplanarity of a ball component obtained with the least-square method
When the plane obtained by the least-square method from the vertexes of all balls is in
contact with the vertex of the most distant ball from the package side, the distance up to the
most distant ball is defined as coplanarity.
Plane obtained with the lowest points
Plane obtained with the least-square method