# US 2018/0024221 A1 · Scheme capable of calibrating value of sampling precision of optical sensor for tracking

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2018/0024221 A1
- Document ID: US20180024221A1
- Status: Published application
- Kind: A1
- Application number: 15/213,411
- Filed: 2016-07-19
- Published: 2018-01-25
- Earliest claimed: 2016-07-19
- Assignees: PixArt Imaging (Penang) SDN. BHD.
- Applicants: PixArt Imaging (Penang) SDN. BHD.
- Inventors: Chiang Hee LIM
- Web page: https://patentgrep.com/patent/US20180024221A1

## CPC

- G01S 3/7803: {Means for monitoring or calibrating}
- B41J 29/38: Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J 29/393: Devices for controlling or analysing the entire machine {; Controlling or analysing mechanical parameters involving printing of test patterns}
- G01S 3/786: the desired condition being maintained automatically
- B41J 19/205: {Position or speed detectors therefor}
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A method for calibrating a value of sampling precision of an optical sensor for tracking includes: reading a precision variance and a setting precision value from a memory device; measuring the sampling precision of the optical sensor under a normal mode to generate an actually measured precision value; calculating a normalized value that is proportional to the actually measured precision value according to the precision variance, the actually measured precision value, and the setting precision value; and, calibrating the actually measured precision value by using the normalized value.

## Claims

### Claim 1

A method for calibrating a value of sampling precision of an optical sensor for tracking, comprising:
reading a precision variance and a setting precision value from a memory device;
measuring the sampling precision of the optical sensor under a normal mode to generate an actually measured precision value;
calculating a normalized value that is proportional to the actually measured precision value according to the precision variance, the actually measured precision value, and the setting precision value; and
calibrating the actually measured precision value by using the normalized value.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
obtaining the setting precision value;
measuring the sampling precision of the optical sensor under a test mode to generate a test precision value;
calculating a difference between the setting precision value and the test precision value, to obtain the precision variance; and
storing the precision variance and the setting precision value in the memory device.

### Claim 3 (depends on 1)

The method of claim 1, wherein the memory device is located within the optical sensor, and the method is performed by the optical sensor.

### Claim 4 (depends on 1)

The method of claim 1, wherein the optical sensor is coupled to a remote host device in which the memory device is located, and the method is performed by the remote host device.

### Claim 5 (depends on 1)

The method of claim 1, wherein the optical sensor is used for tracking movement of a printer head.

### Claim 6 (depends on 1)

The method of claim 1, wherein the optical sensor is used for tracking movement of an optical mouse or movement of a laser mouse.

### Claim 7 (depends on 1)

The method of claim 1, being performed each time when the optical sensor starts up.

### Claim 8

An optical sensor capable of calibrating a value of sampling precision of the optical sensor, comprising:
a memory device storing a precision variance and a setting precision value;
a detecting circuit, for measuring the sampling precision of the optical sensor under a normal mode to generate an actually measured precision value; and
a controller, coupled to the memory device and the detecting circuit, for calculating a normalized value that is proportional to the actually measured precision value according to the precision variance, the actually measured precision value, and the setting precision value, and for calibrating the actually measured precision value by using the normalized value.

### Claim 9 (depends on 8)

The optical sensor of claim 8, wherein the detecting circuit is arranged to measure the sampling precision of the optical sensor under a test mode to generate a test precision value; the controller is arranged to calculate a difference between the setting precision value and the test precision value, to obtain the precision variance; and, the controller stores the precision variance and the setting precision value into the memory device.

### Claim 10 (depends on 8)

The optical sensor of claim 8 is used for tracking movement of a printer head.

### Claim 11 (depends on 8)

The optical sensor of claim 8 is used for tracking movement of an optical mouse or movement of a laser mouse.

### Claim 12 (depends on 8)

The optical sensor of claim 8, wherein the controller is arranged to calibrate the actually measured precision value each time when the optical sensor starts up.

### Claim 13

A host device remotely connected to an optical sensor and capable of calibrating a value of sampling precision of the optical sensor, comprising:
a memory device storing a precision variance and a setting precision value;
a controller, coupled to the memory device, for controlling the optical sensor to measure the sampling precision of the optical sensor under a normal mode to generate an actually measured precision value, for calculating a normalized value that is proportional to the actually measured precision value according to the precision variance, the actually measured precision value, and the setting precision value, and for calibrating the actually measured precision value by using the normalized value.

### Claim 14 (depends on 13)

The host device of claim 13, wherein the controller is arranged to control the optical sensor to measure the sampling precision of the optical sensor under a test mode to generate a test precision value; and, the controller is arranged to calculate a difference between the setting precision value and the test precision value, to obtain the precision variance, and to store the precision variance and the setting precision value into the memory device.

### Claim 15 (depends on 13)

The host device of claim 13 is installed within a printer system, and the optical sensor is configured for tracking movement of a printer head.

### Claim 16 (depends on 13)

The host device of claim 13, wherein the optical sensor is used for tracking movement of an optical mouse or movement of a laser mouse.

### Claim 17 (depends on 13)

The host device of claim 13, wherein the controller is arranged to calibrate the actually measured precision value each time when the optical sensor starts up.