Ricoh LU6000, Field Service Manual

Page: 143 / 150

Light Source/
Light Collection
Method
image Characteristic
4. Pure Laser
• Instant on
• Long lifetime
• Maintenance free
• Smallest Etendue*
• Smaller optics
• High laser costs
* This is the amount of light collected into the display device (such as a DMD or LCD). The smaller the
value is, the smaller size you can achieve.
Optical Mechanism
The blue laser light from the laser diode passes through the afocal lens*[A] and the blue dichroic mirror
[B]. Using the collimator [E], the laser irradiation position on the phosphor wheel is adjusted for
convergence.
The phosphor wheel [D] creates green and yellow lights from the blue light. The green and yellow lights
reflected by the blue dichroic mirror [B].
The blue light passes without modification. To use the blue light as is, there is the blue wraparound path
[C].
The filter wheel [G] creates the red light from the yellow light.
Red, yellow, green, and blue lights reach the DMD [F].
*Afocal lens, without convergence, transmits light signal to a distant point as a parallel light.
Laser
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