# US 7,609,426 B2 · Image scanning apparatus

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- Number: US 7,609,426 B2
- Document ID: US7609426B2
- Status: Granted
- Kind: B2
- Application number: 11/646,738
- Filed: 2006-12-28
- Published: 2007-08-02
- Granted: 2009-10-27
- Earliest claimed: 2006-02-01
- Assignees: Samsung Electronics Co., Ltd.
- Inventors: Yong-Chan Keh; Mun-Kue Park; Byeong-Hoon Park
- Web page: https://patentgrep.com/patent/US7609426B2

## CPC

- G02B 26/0833: {the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD (G02B26/0825 takes precedence; micromechanical devices in general B81B)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An image scanning apparatus for embodying an image using visible lights apparatus includes a scanning unit for irradiating line scan light; a power source for generating voltage for driving the scanning unit; a light detector for detecting duty that is a variation ratio of line scan light with respect to time; and a servo-loop for comparing the detected duty with a preset value, calculating a magnitude of the voltage for driving the scanning unit, and applying voltage, which is controlled depending on the calculated voltage magnitude, to the scanning unit.

## Claims

### Claim 1

An image scanning apparatus for embodying an image using a visible light, comprising:
a scanning unit for irradiating a line scan light;
a power source for generating a voltage for driving the scanning unit;
a light detector for detecting a variation ratio of the line scan light with respect to time; and
a servo-loop for comparing the detected variation ratio with a preset value, calculating a magnitude of the voltage for driving the scanning unit, and applying voltage, which is controlled depending on the calculated voltage magnitude, to the scanning unit.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the scanning unit comprises:
a micro electromechanical system (MEMS) mirror for irradiating the visible light as the line scan light; and
a driver for controlling the MEMS mirror to irradiate the line scan light.

### Claim 3 (depends on 2)

The apparatus of claim 2, wherein the driver comprises an electrostatic, a piezoelectric driving type actuator or a magnetostriction actuator.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the light detector comprises a photo diode for detecting the variation ratio of the irradiated line scan light with respect to time.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein the servo-loop comprises:
a digital converter for digitally converting the variation ratio detected in the light detector;
an integrator for converting the digitally converted variation ratio into direct current duty;
an arithmetic unit for comparing the converted direct current variation ratio with a preset reference duty, calculating an error of a viewing angle range of the line scan light irradiated from the scanning unit, and outputting a control signal for compensating the error;
a phase controller for controlling a phase of input voltage depending on the control signal; and
an amplifier for amplifying a voltage applied from the phase controller and transmitting the amplified voltage to the MEMS mirror.