创建组件识别数据的方法.pdf - 第6页
6/178 IM-SMT-VSNDI C-0002 -000 Figure 1 The shape param eter is used to def ine the shape of the com ponent, and def ines it with a coordinate s ystem lik e shown in Figure 2 . Figure 2 The upper direction of the im age …
5/178
IM-SMT-VSNDIC-0002-000
1. Component data
In vision recognition, data pertaining to the shape of the component, the image input condition
and other elements are required in order to perform component recognition.
This is hereafter referred to as “component data”.
The section below shows the configuration of the component data.
1.1 Component data configuration
Component data consists of the following two parts:
- Shape parameter
- Vision parameter
The vision parameters are the parameters that are required in order for component
recognition to actually be carried out, such as the lighting level and threshold value.
<Examples of recognition parameters>
Items to be set Set value
Notes
Alignment Module Back
Alignment Module Fore
Specifies the device that can be used for
recognition.
Light Main
Light Coax
Light Side
Selects the type of illumination to be used.
Lighting Level
Sets the brightness of the illumination to one
of nine levels from 0/8 through 8/8.
Comp. Threshold Sets the threshold value for recognition.
Comp. Tolerance Sets the tolerance check value as a
percentage.
Search Area(mm) Sets a range for carrying out a component
search.
Datum Angle (degree) Selects from “Normal”,”90 degrees”, “180
degrees” or “270 degrees”.
Multi MACS
Specifies whether to use Multi MACS or not.
Table 1
Caution:
The parameter “Datum Angle” is used when the actual angle of the component supplied from
the feeder is different from the angle specified by the component definition.
Though “Normal” is usually selected for this parameter, in the aforementioned case, “90
degrees”, “180 degrees” or “270 degrees” is specified depends which angle the component is
recognized.
This allows components to be recognized using the standard component data, without
correcting the existing data. (This is a system that automatically rotates the component data
for recognition based on this specification in the image recognition system.
6/178
IM-SMT-VSNDIC-0002-000
Figure 1
The shape parameter is used to define the shape of the component, and defines it with a
coordinate system like shown in
Figure 2
.
Figure 2
The upper direction of the image is defined as the N direction, the lower direction as the S
direction, the direction to the right of the image as the E direction and the direction to the left
of the image as the W direction.
It is possible to define up to two groups of lead information for each direction.
The Lead Group consists of leads that have the same lead width, lead pitch, and lead length.
In the case shown in
Figure 2
, as all of the leads in one direction have the same lead width,
lead pitch and lead length, they can be defined as one Lead Group.
On the other hand, in the case shown in
Figure 3
, as the lead width of the leads are different,
they cannot be defined as a single Lead Group, but are divided into two Lead Groups for
definition purposes.
Normal
90 degrees
180 degrees
270 degrees
Center of the component
W
N
E
S
Y
X
7/178
IM-SMT-VSNDIC-0002-000
Figure 3
Thus, the leads are defined as two different groups when the leads cannot be defined as a
single group due to the factor that individual lead width, lead pitch or lead length are different
or the lead pitches are not constant. (The Lead Groups can be defined up to 2 groups for
each direction.)
Each Lead Group can be defined based on the position and width of the reference lead, lead
length, lead pitch and number of the leads.
For a component shown in
Figure 4
, the leads in one direction can be define based on the
following factors:
- the position of the reference lead
- the lead length
- the lead width
- the lead pitch
- the number of the leads
In order to define the leads of the component as a whole, Lead Groups need to be defined for
each direction.
Figure 4
Group 1 Group 2
N
N direction reference lead position
E direction reference lead position
W direction reference lead position
S direction reference lead position
X
Y
Lead
width
Reflect Lead Length
Lead
pitch
Lead width
Lead pitch
Component center
Reflect Lead Length
N direction
E direction
S direction