Infocus XS1 参照ガイド

Positioning your projector

10

The distance from the projector lens to the screen, the zoom setting, and the video 

format each factors in the projected image size.

4:3 is the native aspect ratio of this projector. To be able to project a complete 16:9 

(widescreen) aspect ratio image, the projector can resize and scale a widescreen 

image to the projector's native aspect width. This will result in a proportionally 

smaller height equivalent to 75% of the projector's native aspect height.

Thus, a 16:9 aspect image will not utilize 25% of the height of a 4:3 aspect image 

displayed by this projector. This will be seen as darkened (unlit) bars along the top 

and bottom (vertical 12.5% height respectively) of the 4:3 projection display area 

whenever displaying a scaled 16:9 aspect image in the vertical center of the 4:3 

projection display area.

When determining the position of your projector, you should consider its intended 

use and input signal aspect ratios. All inputs (other than composite Video being fed 

a 16:9 aspect signal) will display in a 4:3 aspect ratio (and will require an additional 

33% display height than that of the scaled 16:9 aspect image projection area).

The projector should always be placed horizontally level (like flat on a table), and 

positioned directly perpendicular (90° right-angle square) to the horizontal center of 

the screen. This prevents image distortion caused by angled projections (or 

projecting onto angled surfaces). 

The modern digital projector does not project directly forward (like older style reel-

to-reel film projectors did). Instead, digital projectors are designed to project at a 

slightly upward angle above the horizontal plane of the projector. This is so that 

they can be readily placed on a table and will project forward and upwards onto a 

screen positioned so that the bottom edge of the screen is above the level of the 

table (and everyone in the room can see the screen).

If the projector is mounted on a ceiling, it must be mounted upside-down so that it 

projects at a slightly downward angle. 

You can see from the diagram on page 

, that this type of projection causes the 

bottom edge of the projected image to be vertically offset from the horizontal plane 

of the projector. When ceiling mounted, this refers to the top edge of the projected 

image.

If the projector is positioned further away from the screen, the projected image size 

increases, and the vertical offset also increases proportionately.

When determining the position of the screen and projector, you will need to account 

for both the projected image size and the vertical offset dimension, which are 

directly proportional to the projection distance.

4:3 aspect image in a 4:3 

aspect display area

16:9 aspect image scaled to a 

4:3 aspect display area