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DSW700 System Description
6. Digital sensor and lens A large-format, 12-bit, CCD array sensor is fitted on the DSW700. It
provides better performance than any previous model in terms of the area of the film that can
be captured. Faster and larger sensors that are also lower in noise translate directly into
speed and quality improvements. The new sensor also creates a cleaner, more consistent
scan and allows future efforts to be redirected away from perfecting raw capture towards
higher level image processing, such as dodging or automatic light balancing in roll-film
scanning. A 120 mm color-corrected lens has been selected to image the film on to the
sensor. This lens provides greater light throughput and low distortion. An 80 mm lens is
available as an option to facilitate even higher resolution for special applications. By varying
the vertical positions of the CCD sensor and lens, both of which are mounted on a rail
mechanism with clamps and slow motion screws, the physical pixel size at the film plane is
adjustable in the range 4.5-22 µm (0.00018-0.00087 inch). With the optional 80 mm lens,
pixel sizes as small as 3 µm are possible. Raw imagery is captured and may be output at any
pixel size selected by the user, up to 256x the raw pixel size at the film plane. The precise
CCD image geometry and low distortion optics provide an almost distortion-free image.
7. User control panel The user control panel is mounted inside the upper casing of the
DSW700. It has two rows of 16 buttons and a small LCD panel with four rows of characters.
The panel is used to input user commands, run diagnostics, etc. It contains a small computer
circuit to control the LCD display, read the push button switches and communicate with a
DOS-based communications computer card. The panel may also be used for manual
movement of the stage and roll-film transport.
8. Power supplies and electronics There are four DC power supplies: one gives 5V and 12V,
one gives 40V for the motors, one gives 12-24V for the CCD sensor, and the fourth gives 24V
for the LED dome light. The DSW700 runs at 3.2 amps on 110V (1.6 amps at 220V) and the
peak load with a 500 foot (152 m) film roll is calculated to be 6 amps.
9. Outer housing The stylish skins of the DSW700 consist of two main parts. The pedestal
around the base structure is made from pressure formed plastic and the top housing of
fiberglass. The pedestal is dark gray, the top housing silver gray and the colored inserts
Leica red. The product name is in black and the Leica logo in red on white. There is a single
LED to indicate power and the top housing has a large lid for loading and unloading cut or roll
film or for viewing the position of a film roll.
10. Tools and accessories Standard system delivery provides all special tools and accessories
required for routine maintenance, lubrication and calibration, including a precision glass grid
plate for checking stage accuracy, and special filters for calibration of sensor radiometric
response.
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