Commentary; Optical System; Mechanism - Canon LV-7355J Service Manual

Part 1: General Information

4. COMMENTARY

4.1 Optical System

High brightness and high contrast are implemented by a newly designed wide zoom
lens and an improved LCD panel, combined with the Canon's unique Turbo Bright
System.
With these techniques, the LV-7355 with a microlens has 2200 ANSI lumen and the
LV-7350 without a microlens has 1800 ANSI lumen.
× 1.5 wide zoom lens
A wide zoom lens with a short focal length of 25.7 mm and high magnification of ×1.5 is
designed as a bright large-aperture projection lens (F1.7).
The optical system has 10 groups of 12 lenses, including 6 groups of zoom lenses.
All lenses are made from lead-free glass.
LCD panel
The LCD panel has a higher open area ratio than conventional ones by improving
production technologies to increase efficiency of using light. This results in increased
light intensity compared with previous models.

4.2 Mechanism

Cooling mechanism
This model has a higher light intensity and a low fan noise of 37 decibels, which is the
same as the previous models, by improving air flow and changing the fan shape.
The air flow has been optimized and cooling efficiency has been increased by
redesigning the air inlet of the projector. Cooling efficiency can be improved and noise
is reduced while the fan speed is reduced.
In addition, the air intake fan has been redesigned to suppress vibration and reduce
noise.
This projector reduces fan noise automatically by decreasing fan speed at low
temperatures using temperature sensors.
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