KE-750_MAINTE.pdf - 第99页

- 96 - As shown in Figure 7, the timing of vac uum off and that of blow on/off are the same regardless of the part types. Ho wever, the parameter values of the vacuum timer in Figure 6 differ for the part type because, f…

3.8.2.3 Vacuum and blow timing of KE-750/760

Figure 7 shows the operation timing of each SV of vacuum and blow on

KE-750/760, and the changes in the pressure values at the tip of the nozzle at

that timing.

Vacuum

Blow

Negative pressure

Vacuum level

Atmosphere

Z axis

Figure 7

NOTE:

For Z axis: q is for square chip parts; w is for Melf, aluminum electrolytic

capacitor, network resistor, trimmer, SOT, SOJ, SOP, and PLCC; e is for QFP,

TSOP, BGA, connector, and socket.

- 95 -

- 96 -

As shown in Figure 7, the timing of vacuum off and that of blow on/off are the

same regardless of the part types. However, the parameter values of the

vacuum timer in Figure 6 differ for the part type because, for the Z axis, the

speed to move down and the time to be held differ per part type.

By performing blow control, the vacuum destruction time is shortened from 5 ms

(for KE-730/740 as shown in Figure 1) to 12 ms. As a result, a high vacuum

pressure can be maintained for mounting chip parts immediately before their

mount. For other part types, a high vacuum pressure is maintained until the

nozzle stops at the low position. Then, after releasing the vacuum pressure,

the nozzle is moved upward.

3.9 LA Operation

Measurement procedure for Laser Align Ver. 2.1

① Setting window parameters

- 97 -

Holdoff angle: The angle until

the scanning starts to detect the

next minimum width.

Algorithm: The algorithm

used to compute the minimum

width from the result of scanning.

Holdoff Angle

0°

85°

0°

Algorithm

Angle Limit

120

∞

Result 0

Result 1

Result 2

Result 3

Angle Limit: The angle within which if the minimum width is not detected,

an error is returned as the status of the result.

Parameters are set using LOAD_CMD (40).

Holdoff Angle 0

Algorithm 0

Angle Limit 0

Holdoff Angle 1

Algorithm 1

Angle Limit 1

*1: Setting for the result 2 and result 2 shall not be

changed from the default setting.