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

 

 

 

TYPE1

9X-16X

Blue

 

 

 

TYPE2

13X-27X

Green

 

 

 

TYPE3

23X-50X

Yellow

 

 

 

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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Image 47
Kodak 2400DSV service manual Condenser Lens