RS-1_instruction manual - 第674页

Pa r t 2 D et ai l ed Des c r i pt i o n of Ea c h F unc t i o n Chapte r 6 G e neral - Purpose Vision Co mpone nt 6- 43 W1 W2 Ｌ <TOP VIEW> W 1: Pitc h of Elem ent group 1 PW 2: Pitc h of Elem ent group 2 L: Dis ta…

Part 2 Detailed Description of Each Function Chapter 6 General-Purpose Vision Component

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Limitations of a general-purpose vision component 6.6

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

Width

Normal lead

Gull-wing lead

The length of a lead

should be longer than

the width.

- 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.

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

H ≦ 0.5 P1 and H ≦ 0.5 P2

L ≧ 2P1 and L ≧ 2P2

- 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.

Part 2 Detailed Description of Each Function Chapter 6 General-Purpose Vision Component

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Ｌ

W1: Pitch of Element group 1

PW2: Pitch of Element group 2

L: Distance between two element groups in

the longitudinal direction

L ≧ W1, ≧ W2 and L ≧ 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.

First element group

Second element group

Pitch 1

Pitch 2

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

precision.

- 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.

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.

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,

L ≧ 2D1 and L ≧ 2D2

- 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.

Part 2 Detailed Description of Each Function Chapter 6 General-Purpose Vision Component

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

accuracy.

- 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.

5. Outline-recognized components

- If you define an outline-recognized component with only one type of element (corner, side or

mark) other than a lead and ball, you have to specify two or more corresponding elements. If

you specify another type of element also, you only have to specify one corresponding element

(excluding a side).

- Up to four corners can be specified for this type of component. Note that you cannot specify

two or more corners whose specified angle is the same (theta offset).

ｰ

θ270°

Corner

θ0°

Corner2

θ0°

Corner1

θ90°

Corner

θ180°

Corner

Although there are two corners

whose theta angle is 0 degrees, you

can specify just one corner of them.

- If another corner or an element (lead, rectangular land or rectangular mark) having a corner

whose angle is the same is located near one corner element, they should be far from one

another by 4 mm or more provided that the VCS (54mm view) is used.

- Up to four sides can be specified per component. However, note that two or more sides

whose specified angle is the same (theta offset) cannot be specified per component. A side

should be located on the outer frame, and its length should be half or longer of the dimension

of the component. When you specify a side (sides) only as an element, include two sides

that are orthogonal to one another.

- The linear part of the setting element should be 4.0 (±2.0 mm) or more calculated in terms of

VCS (54mm view).

- When the inside of a part is black, the thickness of the side portion should be 0.3 mm or more.

- Up to three marks can be specified per component.

- You can specify a hole as a circle mark of the reverse polarity (dark). In this case, it has to

be displayed as a circle clearly on the screen. (Note that a hole may not be displayed as a

circle clearly on the screen when a thick component is to be recognized with the perspective

light.)

- A mark should be located far from a similar-sized mark or similar-shaped and similar-sized

element (ball or circular land) by 5 mm or more provided that the VCS (54mm view) is used.

6. Notes when a general-purpose vision component data format is used

- Use this format for an element group (especially lead element group) whose positioning

precision is sufficient to be recognized. When you use this format for an element group

(especially lead element group) whose positioning precision is uncertain, a recognition error

may occur frequently.