Lexmark Scanner Technology ? Comparison of Lens Reduction Scan Module (LRSM) and Contact Image Sensor Module (CISM)

Audience: ‘Lexmark only’ below

Overview

This document presents a basic comparison of two scanner technologies used in some of Lexmark’s multifunction printers: Lens Reduction Scan Module (LRSM) and Contact Image Sensor Module (CISM).

IMPORTANT! This information is considered Lexmark confidential and should never be sent to a customer, nor shared in databases or other systems outside of Lexmark’s knowledgebase.

Form and Size Comparison

LRSM	CISM

Basic Comparison

	LRSM	CISM	Trilinear CISM
Cost (A4 Size)	~$20	~$10	~$17
Module/Scanner Size	Bulky	Slim
Optical Design	Complex	Simple
Optical Distance	Large 30-50cm	Small 1-2cm
Depth of Field/Focus	Best >2cm Less restrictions on paper path	Very Shallow <0.25cm
Effective Width	> 225mm	< 219mm
E-Deskew Support	Yes	No (Too Narrow)
Overall Image Quality	Better	Good	Better
Highlighter Copy	Better Tuning Mitigation Needed	Bad (Physically can’t resolve highlighters because no color filters)	Better Tuning Mitigation Needed
Color Fringing Auto Mono/Color Detect	Better	Bad ASIC Mitigation Needed	Better
Chip Gap	None	Bad ASIC Mitigation Needed	Bad ASIC Mitigation Needed

Current Products

Model	Color/Mono Engine	Scanner Technology
MX31x, MX41x, MX51x	Mono	CISM
CX31x, CX41x, CX51x	Color	LRSM
MX61x	Mono	LRSM
X74x	Color	LRSM
CX725	Color	LRSM
MX71x, MX81x	Mono	Dual LRSM
X79x	Color	Dual LRSM
CX82x, CX86x	Color	Dual LRSM
X925	Color	LRSM
X950	Color	LRSM
MX91x	Mono	LRSM (Frontside) Trilinear CISM (Backside)

Output Comparison

Depth of Focus/Field
LRSM	CISM

Color Fringing
LRSM	CISM

Highlighter Scan
LRSM	CISM

LEGACY ID: FA1179