22
Sirius-PJ1Training
Slide 22
Iris Unit
The Iris unit physically blocks the light path from the
projector to the screen when the projector is on but
nothing is being projected.
At these times during a presentation, a blank white screen
is often not desirable. So, there are three ways to get
around this.
1. Turn off the projector. If you do that, you have to think
about cool-down and warm-up times. Also, if you keep
turning the lamp off/on, the lamp's life can be reduced.
2. Send an all-black video signal. This can cause delicate
optical components to overheat, reducing the projector's life
3. Physically block the light path inside the projector. The
projector keeps working as normal but nothing comes out of
the projector lens. This is how the Iris unit works.
This is the first Ricoh projector to contain an Iris unit.
No additional notes
