Motorola 6700 Especificaciones descargar pdf (Pagina 19)

Installation 2 - 5

Polysiloxane Coating

Polysiloxane type coatings are applied to plastic surfaces to improve the surface resistance to both scratch and

abrasion.

To gauge a window's durability, use ASTM standard D1044, Standard Test Method for Resistance of Transparent

Plastics to Surface Abrasion (the Taber Test), which quantifies abrasion resistance as a percent increase in haze

after a specified number of cycles and load. Lower values of the increase in haze correspond to better abrasion

and scratch resistance. See Table 2-2.

A Word About Coatings

In all cases, adhere to the minimum tilt angle specified in Figure 2-2 on page 2-6. When the Symbol SE6700 is set

to an exposure time less than 10 milliseconds and gain less than 127, anti-reflection coating is not necessary.

Otherwise, consider single-side or double-side AR coatings. If using an anti-reflective coating, polysiloxane coating

is not required. Recess the exit window to minimize scratches and digs.

If using an anti-reflective coating, the specifications in Table 2-3 apply.

Table 2-2

Taber Test Results on Common Exit Window Materials

Sample

Haze 100

cycles

Haze 500

cycles

Abrasion

Resistance

Chemically Tempered

Float Glass

1.20% 1.50% Best

PMMA with

Polysiloxane

Hardcoat

3% 10%

ADC 5% 30%

PMMA 30% Worst

* All measurements use a 100 gram load and CS-10F Abraser.

Table 2-3

AR Coatings Specifications

Feature Description

Material Both tempered glass and plastic (e.g., CR-39 or hard coated

acrylic) exit windows can be AR coated. AR coated glass is

easier and more durable because of a better adhesion property

on the glass structure. In addition, it can be more cost effective

to put an AR coating on the glass substrate rather than on the

plastic.

AR Coating

Specification

1. One side tempered AR coating: 92% minimum within

spectrum range from 450nm to 700nm.

2. Double side AR coating: One side AR coating must be 97%

minimum within spectrum range from 450nm to 700nm.

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