# US 2010/0166445 A1 · Toner adhesion amount measuring apparatus, and toner adhesion amount measuring method

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

- Number: US 2010/0166445 A1
- Document ID: US20100166445A1
- Status: Published application
- Kind: A1
- Application number: 12/641,953
- Filed: 2009-12-18
- Published: 2010-07-01
- Earliest claimed: 2008-12-25
- Assignees: Canon Kabushiki Kaisha
- Inventors: Kunitoshi Aoki
- Web page: https://patentgrep.com/patent/US20100166445A1

## CPC

- G03G 15/5058: {using a test patch}
- G03G 15/5041: {Detecting a toner image, e.g. density, toner coverage, using a test patch (G03G15/553 takes precedence)}
- G03G 2215/00042: Optical detection
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An apparatus includes an irradiation unit configured to irradiate a light onto a toner image, a detection unit configured to detect reflected light from the toner image, and a deriving unit configured to derive a toner adhesion amount of the toner image, based on detection result by the detection unit in measurement range of integer multiple of screen pitch of the toner image.

## Claims

### Claim 1

An apparatus for measuring a toner adhesion amount of a toner image formed on an image bearing member of an image forming apparatus, the apparatus comprising:
an irradiation unit configured to irradiate light on the toner image;
a detection unit configured to detect reflected light from the toner image; and
a deriving unit configured to derive the toner adhesion amount, based on detection result by the detection unit in measurement range of integer multiple of screen pitch of the toner image.

### Claim 2 (depends on 1)

The apparatus according to claim 1, further comprising a scanning unit configured to scan irradiated light.

### Claim 3 (depends on 1)

The apparatus according to claim 1, further comprising:
a position detection unit configured to detect reflection position of detected reflected light; and
a calculation unit configured to calculate reflected light amount of the detected reflected light,
wherein the deriving unit calculates the toner adhesion amount, based on the detected reflection position or the calculated reflected light amount.

### Claim 4 (depends on 3)

The apparatus according to claim 3, wherein the position detection unit detects the reflection position of the reflected light, by detecting a peak position of reflection waveform data output from the detection unit.

### Claim 5 (depends on 3)

The apparatus according to claim 3, wherein the calculation unit calculates the reflected light amount, by calculating an area of peak portion of the reflection waveform data output from the detection unit.

### Claim 6 (depends on 3)

The apparatus according to claim 3, wherein the deriving unit switches between calculating the toner adhesion amount based on the reflection position of the reflected light, according to density information of the toner image, and calculating the toner adhesion amount, based on the reflected light amount.

### Claim 7

An apparatus comprising:
an irradiation unit configured to irradiate a light onto a toner image formed on an image bearing member of the apparatus;
a detection unit configured to detect reflected light from the toner image;
a deriving unit configured to derive a toner adhesion amount of the toner image, based on detection result by the detection unit in measurement range of integer multiple of screen pitch of the toner image; and
an image forming unit configured to form an image based on set value corrected based on the derived toner adhesion amount.

### Claim 8

A method for measuring a toner adhesion amount of a toner image formed on an image bearing member of an apparatus, comprising:
irradiating a light onto the toner image;
detecting a reflected light from the toner image; and
deriving the toner adhesion amount of the toner image, based on detection result of the detection in measurement range of integer multiple of screen pitch of the toner image.

### Claim 9 (depends on 8)

The method according to claim 8, further comprising scanning irradiated light by a scanning unit.

### Claim 10 (depends on 8)

The method according to claim 8, further comprising:
detecting reflection position of detected reflected light by a position detection unit; and
calculating reflected light amount of the detected reflected light by a calculation unit,
wherein the toner adhesion amount is derived based on the detected reflection position or the calculated reflected light amount.

### Claim 11 (depends on 10)

The method according to claim 10, wherein the detecting reflection position is detected, by detecting a peak position of reflection waveform data output from the detection unit.

### Claim 12 (depends on 10)

The method according to claim 10, wherein the calculating reflected light amount includes calculating an area of peak portion of the reflection waveform data output from the detection unit.

### Claim 13 (depends on 10)

The method according to claim 10, further comprises switching between calculating the toner adhesion amount based on the reflection position of the reflected light, according to density information of the toner image, and calculating the toner adhesion amount, based on the reflected light amount.