The VCSEL (Vertical Cavity Surface Emitting Laser) method is adopted in this machine, as in the ProC751 series, but the components are different.

In the ProC751 series, there are VCSELs for each color and hexagonal polygon mirrors. But this machine has two VCSELs (one for K/C and one for M/Y) [B] and two four-sided double-layered polygon mirrors [A].

This machine uses VCSEL technology as ProC751 does, and realizes a high image quality (approx. 4800dpi x 4800dpi). But the components and the control method are different from those of the ProC751.

The polygon mirrors [C] of this machine are smaller than those of the ProC751 series. But this machine realizes not only the same image quality as the ProC751 series, but also a cost reduction because only two VCSELs are enough.

There is no shutter in the laser unit for K and C, unlike the previous models in this series (MP C6502/C8002, Pro C5100S/C5110S).

Writing Control Method Difference

In the ProC751EX, each VCSEL emits a beam for one color. While in this machine, with the PBS, one VCSEL can emit a beam for two colors.

In this machine, VCSEL emits beams alternately (K > C > K > C). A beam from VCSEL is divided into two beams with the PBS. One of the beams is used for K and heads to the upper polygon mirror; the other beam is used for C and heads to the lower polygon mirror. When the K beam heads to the drum, the C beam does not head to the drum because there are differences in reflective-surface directions between the upper polygon mirror and the lower polygon mirror. Likewise, the K beam doesn’t head to the drum when the C beam heads to the drum.

In the ProC751EX, each color has a separate VCSEL unit, but each polygon mirror handles two colors. Beams arriving at one side of the mirror are sent to one PCU, and the beams arriving at the other side of the mirror are sent to another PCU.

In this machine, each VCSEL unit handles two colors. Instead of just one polygon mirror for two colors, there is a stack of two mirrors (one mirror for each color). The PBS just after the exit from the VCSEL unit sends some beams to the top mirror and some to the bottom one.

Pro C751EX

Pro C5200S/C5210S, MP C6503/C8003

The emitter generates 40 beams (ch1 to ch40).

In a VCSEL package, a photo sensor detects the laser output. Laser beams heading to the polygon motor pass through the emitter surface, the quarter wave plate [A] and the collimating lens [B]. And then the laser is emitted to the drum in a vertical array of lines.

The VCSEL method contributes to reducing the polygon motor speed, curbing heat emission significantly, and energy saving.

VCSEL: Vertical Cavity Surface Emitting Laser