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(PI875 Service Manual|
Distance belwess aperived anda and
es
active area
Window aperture total reflectivity
Reflective type
90
i a a
Absorptivetype
7
Active area absorption coefficient
a
Note 11
Thermal impedance, active area to case
Thermal impedence, window aperture to
case
Thermal impedance, case to thermal stud
Note 11
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Electrical input power
Note I : Differential Mirror Position
Differential mirror position refers to the geometric distortion of the array compared to an ideal
array that locates the center of each mirror on the corresponding grid at 17.0 micron pitch. It is
created by distortion in the optical performance of the semiconductor processing equipment used to
define the array, and to a lesser extent by warpage and nonuniform etching in processing of the array.
As an example, for the 8460 device, which has a resolution of 848 horizontal by 600 vertical pixels,
if we define a coordinate system with origin at the upper left corner pixel (0,0), the pixel at the lower
right hand corner will be at coordinates (14,399 +/- 1 micron, 10,183 +/- 1 micron). Similar
tolerances apply within the array, e.g., the pixel in the 100th row and 100th column will be centered at
coordinates (1700 +/- 1 micron, 1700 +/- 1 micron) assuming we define the corner pixel as being in
the zeroth row and the zeroth column, centered at coordinates (0,0).
Note 2 : Tilt Angle Tolerance
Limits on variability of mirror tilt half angle are critical in the design of the accompanying
optical system. Variations in tilt angle within a device may result in aparent non-uniformities, such as
line pairing and image mottling, across the projected image. Variations in the average tilt angle
between devices may result in colorimetry problems and a reduction in system contrast. The specified
limits represent the tolerances of the average tilt angle between devices. Tilt angle variation within a
device is discussed in Note 7.
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