KE2040Instruction Manual Ver2.01,REV04.2003.6.25.pdf - 第448页
5 − 58 I f t he length of a lead chang es alternat ively as show n in Figure 5. 2.4.4. 2, def ine two groups: one having long leads and another having shor t leads. The pitch is also defined f or a g roup of long leads a…
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5.2.4.4 Procedure for creating general-purpose vision component data
5.2.4.4.1 Lead components (Element group/Element format)
This section describes the procedure for creating data on lead components
(multi-lead components).
1) Operation on the “Extended Vision” screen
- Select “Lead Component” on the “Component Type” combo box.
- Check the “Element group/Element format” check box in the “Define data
format” field.
- Click the <Add> button on the “Element Group List”.
2) Operation on the “Element Group” screen
Define an element group on this screen.
An element group is composed of components whose lead size and pitch are the
same.
See Figure 5.2.4.4.1 for an example of a multi-lead component. The procedure
for creating data on this component is to be described below.
▼
▼▼
▼ Description
In the example below, four element groups are defined. The size and pitch of
leads of the first and third element groups are the same, while the direction and
position of leads of these groups are different from each another. The size and
pitch of leads of the second and fourth element groups are the same also, but
leads of these groups are not arrange continuously, so the lead pitch is not the
same. If the distance between these leads is an integral multiple of the specified
pitch, they can be defined as one element group that has an area having no lead.
However, we recommend that you define them as separate element groups.
To define the direction and position of the element group, specify the component
posture. In Figure 5.2.4.1.1, the direction of a component shown is normal. The
posture of multi-lead components is regulated from the top view.
Figure 5.2.4.4.1
Fourth element
group
Third element
group
Second element
group
First element
group
Top View
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If the length of a lead changes alternatively as shown in Figure 5.2.4.4.2, define
two groups: one having long leads and another having short leads. The pitch is
also defined for a group of long leads and that of short leads separately.
Figure 5.2.4.4.2
① Name
Name an element group to be handled. When you want to change an
element group, specify its name to edit it.
- A name is assigned automatically with serial numbers.
- Users can change this numbered name to an alphanumeric name (up to 32
characters).
In the example, the numbered name is used.
② First element position
Specify the position (X, Y) and direction (Theta) of an element group.
As the position, specify the distance (offset) from the center of a component.
Normally, the center of a component is the center of the component outline.
- If the placement coordinates set in Placement data of a production program
is not based on the center of the component outline, you can specify the
coordinates of the reference component center with coordinates different
from the center of the component outline.
Figure 5.2.4.4.3 indicates that the center of the component outline is the
center of a component, while Figure 5.2.4.4.4 indicates that the center of
component body is the center of a component.
Figure 5.2.4.4.3
Figure 5.2.4.4.4
Top View
Center of a component
(Center of the component outline)
Top View
Center of a component
(Center of the component body)
Second element group
First element group
Pitch 2
Pitch 1
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- To be precise, the “First element position” is the distance (offset) from the
center of a component to the first element.
In the same manner as defined for a standard lead components (such as a
QFP, SOP and connector), the first element is the leftmost element when an
element group is located on the bottom side, the lowest element when
located on the right side, the rightmost element when located on the top
side, or the top element when located on the left side. Figure 5.2.4.4.5
shows the first element position of the component used as an example.
For a lead element, the first element position is the end of the first lead with
being viewed from the center of a component.
Figure 5.2.4.4.5
- The direction (angle) of an element group is 0 degrees when it is located on
the bottom side, 90 degrees when located on the right side, 180 degrees
when located on the top side, and 270 degrees when it is located on the left
side with counting anti-clockwise.
In the example, the angle of the first element group is 0 degrees and the
angle of each group from the second element group to fourth element group
is 180 degrees.
- The VCS finds each element group of a general-purpose vision component,
then recognizes it with assuming that the component center obtained when
you set the element group layout is on the VCS center.
If the component pick-up position is shifted from the center of a component
as shown in Figure 5.2.4.4.6, set the following values as the recognition
offset: an offset for recognizing a component so that the center of a
component can be located on the VCS center.
Recognition offset X: (Xcenter – Xpick)
Y: (Ycenter – Ypick)
When the machine recognizes a general-purpose vision component, the
center for recognizing a component is the component center obtained when
you set the element group layout.
Therefore, if the placement center position of a component is shifted from
the center of a component as shown in Figure 5.2.4.4.6, set the following
values as the Placement offset: an offset for placing a component so that
the placement center point of a component can be moved on the placement
position on a board.
Placement offset X: (Xplace – Xcenter)
Y: (Ycenter – Ycenter)
Top View
Direction: 0 degrees
Direction: 180 degrees