KE2040Instruction Manual Ver2.01,REV04.2003.6.25.pdf - 第417页

5 − 73 - W hen a lead end (lead end position) of one lead elem ent g roup is laterally located near another lead element g roup, whose lead end height is alm ost the same with that of the f ormer lead element g roup (tha…

5 − 72

5.2.4.5 Limitations of a general-purpose vision component

1. Quantity

- Up to 20 element groups can be defined per component.

- Only one extended array group can be defined per component.

- The maximum number of lead elements that can be defined per element group

is 384, and that of ball elements is 6936. These numbers include missing

leads/balls.

- One corner/side/mark element should be defined per element group

respectively.

- The maximum number of ball elements that can be defined per extended array

group is 256.

- Up to four blocks of missing elements can be defined per element group. If

you want to define five or more blocks of missing elements, divide the element

group into two or more groups.

- Up to 6936 balls can be defined per component.

- Up to four corners/sides and up to three marks can be defined per component.

- The total number of element groups that can be handled with one production

program is up to 1,024.

- The total number of extended array groups that can be handled with one

production program is up to 256.

2. Combination

- Both a lead element and a ball (or land) element cannot be defined for one

component at the same time.

- Combination of elements that are seen under the same light only can be

defined for one component.

- Both an element group and an extended array group cannot be defined for one

component at the same time.

3. Lead components

- At least one element group including two or more leads has to exist on a

component.

- As the lead size, the ratio of the length to width should be 1 or more. For a

gull-wing lead, the ratio of the length to the length specified in the “Lead size”

should be 1 or more.

Length Length

Width

Normal lead Gull-wing lead

The length of a lead

should be longer than

the width.

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- When a lead end (lead end position) of one lead element group is laterally

located near another lead element group, whose lead end height is almost the

same with that of the former lead element group (that is, the height difference

should be 0.5 times of the pitch or less), the centers of the adjacent two leads

should be located far from one another by two times of the pitch. For an

element group that has only one lead, the center of one group should be far

from that of another one by two times of the lead width. If a lead-like shaped

substance is located near a lead, they should be far from one another in the

same manner.

- If another lead group is located in the longitudinal direction of a lead of one

lead group, it should be far from the lead by the distance equal to the lead

width and at least by 1 mm.

- In any case: if you define all lead groups or if you define only certain groups

to recognize them, you have to follow the two requirements described just

above.

- For a connector on which two types of leads are arranged alternatively: long

one and short one, you can define two groups: a group of long leads and that

of short leads. You can define these lead groups even though they overlap

one another if leads themselves do not overlap each other. The requirements

on the lead distance described above are not applied to these lead groups

unless bent leads of the different groups do not overlap.

- If you specify only the limited leads of one lead group, we cannot guarantee

their recognition precision (due to the Version 1.10 limitations).

- You cannot define one lead for two different groups. You cannot define leads

that overlap each other. Note that you happen to define leads in these ways

if you set the wrong lead pitch, number of leads and/or lead width.

- You cannot specify an inner lead as the lead element type. If you specify in

this way, we cannot guarantee the recognition precision (due to the Version

1.10 limitations).

Ｌ

Ｈ

P1: Pitch of Element group 1

P2: Pitch of Element group 2

L: Distance between two element groups

H: Difference between lead ends of two element

groups

≧

0.5 P1 and H

≧

0.5 P2

≧

2P1 and L

≧

2P2

Ｌ

W1: Pitch of Element group 1

PW2: Pitch of Element group 2

L: Distance between two element groups in

the longitudinal direction

≧

W1,

≧

W2 and L

≧

1 mm

First element group

Second element group

Pitch 1

Pitch 2

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4. Ball components

- At least one ball group consisting of three or more balls of the same size

should exist on a component.

- When the similar size of ball/land groups (the diameter ratio should be less

than 1.5) are located closely, the center of one group should be far from that of

another group by 2 times of the ball/land diameter or more.

- In any case: if you define all ball groups or if you define only certain groups to

recognize them, you have to follow the requirement described above.

- For a staggered type of BGA, you can define it as two square-grid ball groups.

In this case, you can specify these two groups even though these ball groups

overlap one another. However, any ball of these groups should not overlap

with each other, and the centers of two adjacent balls of each group should be

located far from on another by 1.5 times of their diameters.

- If you specify only limited balls of one ball group, we cannot guarantee their

recognition accuracy (due to the Version 1.10 limitations).

- If the diameter check precision is the diameter ± 50 % or less, the recognizable

pitch and recognizable ball diameter are limited greatly.

- A rectangular land should be a square. (Note that the machine may

recognize an element as a lead if the ratio of the lead width to the lead length

of a rectangular land is 1 : 1 or less.)

- You cannot define a ball for two different ball groups. You cannot define balls

that overlap each other either. Note that you happen to define balls in these

ways if you set the wrong ball pitch, number of ball lines and/or ball diameter.

Ｌ

D1: Ball diameter of Element group 1

D2: Ball diameter of Element group 2

L: Distance between the centers of the two

adjacent balls

When D1 < 1.5D2 or D2 < 1.5D1,

≧

2D1 and L

≧

2D2

D: Ball diameter

L: Distance between the

centers of two adjacent balls

L >= 15

Element

roup 2

Element

roup 1