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4
Mechanical and Electrical
4.1.5 Condenser Lens
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.
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.
TYPE | Lens Magnification | Color Code |
TYPE1 | 7.5X | Blue |
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TYPE1 | Blue | |
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TYPE2 | Green | |
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TYPE3 | Yellow | |
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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.
Fresnel Lens
The Fresnel Lens, which is an acrylic plate with stepped setbacks, ensures even illuminance from the Lamp.
Fresnel Lens
Movable Condenser
Lenses
Projection
Lamp
Condenser Mirror
Brightness
Shift Lever
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