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4.1.5 Condenser Lens
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Overview
Not only must the amount of light projected onto the Screen or CCD
remain even despite changes in the microfilm or magnification ratio, but
also the light coming from the Projection Lamp must be efficiently
condensed. To accomplish this, the machine is equipped with two
Movable Condenser Lens: one convex and one concave.
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Movable Condenser Lenses
The Brightness Shift Lever is moved manually according to the
magnification of the Projection Lens being used so that the Movable
Condenser Lenses are moved to the set position. The set position is color-
coded, TYPE 1 to 3, each defined by a corresponding magnification of the
Projection Lens.
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Condenser Mirror
Light from the Projection Lamp after having passed through the Movable
Condenser Lenses strikes this Mirror and is reflected onto the Fresnel
Lens.
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Fresnel Lens
The Fresnel Lens, which is an acrylic plate with stepped setbacks,
ensures even illuminance from the Lamp.
TYPE Lens Magnification Color Code
TYPE1 7.5X Blue
TYPE1 9X-16X Blue
TYPE2 13X-27X Green
TYPE3 23X-50X Yellow
Fresnel Lens
Condenser Mirror
Projection
Lamp
Brightness
Shift Lever
Movable Condenser
Lenses