Argox AS-9500 User Manual download pdf (Page 42)

Thermal and Centering

Thermal Considerations

Care must be taken when designing the Image Engine into any

system. Internal heating of the Image Engine can occur in high

duty cycle scanning applications in several ways. The high

visibility aimer dissipates a significant amount of power as heat.

The illumination and aiming LEDs also release heat, and are a

major contributor to thermal increases in high use or in Auto-sense

mode. An increase in temperature around an Image Engine can

cause noise levels on the imager, degrading image quality. The

thermal rise can also affect the laser diode. In a continuous

scanning or high use environment, the Image Engine temperature

can rise 15° to 20°C. Under high ambient temperature conditions,

the laser diode is at risk of thermal breakdown and possible failure.

The image quality and decode performance will also degrade. The

Power Control PWM can be used to reduce the effect of the

Illumination LEDs on thermal rise, however, this also reduces the

intensity of the illumination. Reducing the intensity of the

illumination reduces total power used but can also reduce the

depth of field in low light environments.

Centering

Use Centering to narrow the imager’s field of view to make sure

the imager reads only those bar codes intended by the user. For

instance, if multiple codes are placed closely together, centering

will insure that only the desired codes are read. (Centering can be

used in conjunction with Aimer Delay, for the most error-free

operation in applications where multiple codes are spaced closely

together. Using the Aimer Delay and Centering features, the

imager can emulate the operation of older systems, such as linear

laser bar code imagers. In the example below, the gray area is the

full imager field of view and the white area is the centering

window. Bar Code 1 will not be read, while Bar Code 2 will be.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 158 159

No comments

Argox AS-9500 User Manual Page 42