RS-1_instruction manual.pdf - 第66页

Part 1 B asic O peration Chapter 1 Overv iew of the Machine 1- 48 Center ing s y s tem Instead o f using conv entional me chanical c entering system, this machi ne uses t ouchless centering system wher e LED align s enso…

Part 1 Basic Operation Chapter 1 Overview of the Machine

1-47

(3) Board Recognition Marks

1) Shape

Create the board recognition marks under the following conditions.

We recommend the filled circle for the mark.

Notes:

1. When recognition, the mark shall be placed in the angle shown above.

However, if you specify "Use of each circuit mark" for a non-matrix PWB, the mark can be

recognized only when all marks of the reference circuit are positioned in the angle

described and the circuit is positioned at 90, 180, 270 or 360 degrees.

2. The fiducials of the same shape and same size is preferable within a board.

3. When processing, copper foil or solder plating can be recognized

4. Maximum number of marks which can be registered

Board mark: 2 set (2 marks or 3 marks)

Component positioning mark: 100 sets (Pairs of 2 marks to 3 marks)

5. Items that can be registered

Mark number, Balance detection window, Normal/reverse rotation identification when

detected, Mark shape, Outer dimensions, Effective value of projection, Matching

6. If there is no recognition mark on a board, register a user designated template to allow

the machine to recognize marks

2) Clearance

In the area around each recognition mark, there shall be a space in which any other

component such as a conductor pattern, solder resist and marking is not located.

The dimensions of this space should be a square whose size is larger than the outer area of a

recognition mark by 0.5 mm or more in the X direction and 0.5 mm or more in the Y direction.

A and C sizes:

0.5 to 3.0 mm ± 10 % or

lower

B size:

0.2 mm or longer

Circle

Square

Diamond

Regular

triangle

Up-side-down

triangle

Checker

pattern (1)

Cross

Inside-blank

circle

Inside-blank

square

Inside-blank

diamond

Inside-blank

up-side-down triangle

Checker

pattern (2)

Inside-blank

Regular triangle

0.5 mm or more

Part 1 Basic Operation Chapter 1 Overview of the Machine

1-48

Centering system

Instead of using conventional mechanical centering system, this machine uses touchless centering

system where LED align sensor is used to read the position and angle of components. This can be

achieved by detecting the shade of the components created by the laser rays applied horizontally to

the components.

LNC120-8

By moving Z-axis up and down, a component is picked with vacuum, and the LED is applied to the

component. A shade is made where the LED is obstructed by the component. By turning the

component along q-axis, the shade changes.

◇ According to the change of the shade, offsets of the position and angle of the picked component

are calculated. These offsets are corrected when mounting.

Caution

If the surface of the glass that covers the component detecting section of the

laser unit is scratched, it causes a component recognition error with laser.

Note the following points to use the machine.

1. Do not use any component whose size exceeds the regulated maximum

component size.

2. Even though a component size is the regulated maximum component size

or smaller, the component may become in contact with the glass surface

when you change the component pick-up position.

Specifications (Maximum component size)

LNC120-8 Square component: □ 50 mm Length of a diagonal line: 70 mm

Glass

Part 1 Basic Operation Chapter 1 Overview of the Machine

1-49

(1) Flow of laser align centering

1) For LNC120-8

①

②

③

④

⑤

⑥

Part attracting

Pick the component by driving

Z-axis, and adjust the

component at laser align height.

Rotation in θ direction starts.

While the θ-axis is accelerating, the system

does not start measuring a component.

Laser align measurement

Edge

When the speed of the rotation in θ direction

reaches the certain value, the system starts

laser align measurement.

Placement

The sensor obtains the edge position of the

area shadowed by a component.

The system saves a beam corresponding to

the edge position as a “tangent line” into the

sensor.

The system obtains the tangent line data on

each angle by rotating the θ axis 360

degrees.

When the θ axis finishes rotating by 360

degrees, the sensor generates and

analyzes the outer shape of a component

based on the tangent line data obtained at

each angle to return the measurement

result to the mounter.

- Component size

(X direction: wX Y direction: wY)

- Distance between the center of the

nozzle rotation and the center of a

component

(X direction: dX Y direction: dY)

- Angle (θ) error: dRz

The system corrects the following errors

and places a component on a board.

Positioning error (dX, dY)

Angle error (dRz)