Chapter 2—Installation

2.5. Lens Throw Distance and Screen Width

The distance from the closest point of the screen to the projector is known as the throw distance.

Table 2.0-3 Lens Definitions

Phrase

Definition

Throw distance

Distance from the projector lens to the closest point on the screen.

 

 

Screen width

Maximum width of picture that can be displayed.

 

 

To determine the throw distance from the projector to the screen, multiply the screen width by the lens ratio.

For instance, if the projection lens being used is the 1.5:1 lens and the desired screen width is 3.65 meters (12 feet), the distance from the closest point of the screen to the projector lens is 5.48 meters (18 feet), as illustrated in Table 2.0-4.

Table 2.0-4 Throw Distance Calculation

Screen Width

x

Lens Ratio

=

Throw Distance

3.65 meters

x

1.5

=

5.48 meters

 

 

 

 

 

12 feet

x

1.5

=

18 feet

 

 

 

 

 

A pictorial illustration of throw distance and screen width is shown in Figure 2.0-7.

A graphical model is shown in Figure 2.0-8 on page 2-8. Refer to these figures for calculating the throw distance required using the different projection lenses available for the HJT Model 100 Projector.

WARNING!!! Lens installation should be performed only by factory Certified Technicians. Please contact your dealer or distributor of the product for lens installation.

For special applications where the projector is not positioned orthogonally to the screen, more detailed calculations are required to obtain more accurate throw distances. Special HJT Lens Calculator software can be downloaded from HJT’s Web page at www.hjt.com

2-6

Hughes-JVC Technology Company

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JVC CB100 manual Lens Throw Distance and Screen Width, Lens Definitions, Throw Distance Calculation, Phrase Definition

CB100 specifications

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