Reading device setting reading start position by reading reference hole having L-shape

Patent metadata

Field	Value
Publication number	US-11870958-B2
Application number	US-202117563683-A
Country	US
Kind code	B2
Filing date	Dec 28, 2021
Priority date	Dec 29, 2020
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

In a reading device, a light transmissive member has a front surface on which an original is placed. A peripheral member is adjacent to the light transmissive member, and includes a back surface in which a reference hole is formed. The reference hole includes a first edge and a second edge intersecting with each other. A reading sensor faces the back surface of the light transmissive member and the back surface of the peripheral member. The controller controls the reading sensor to read a reading range including the reference hole to obtain a read image, and determines a reference position in the reading range based on the read image. The reference position is determined to an intersection between the first edge and the second edge. The controller sets a reading start position based on the reference position.

First claim

What is claimed is:

1. A reading device comprising:
a light transmissive plate having a front surface on which an original is placed, and a back surface;
a peripheral frame located adjacent to the light transmissive plate, the peripheral frame including a hack surface in which a reference hole is formed, the reference hole having first and second segment, the first segment including first inside edge and the second segment including a second inside edge intersecting with the first inside edge at an angle to define an inside part of the reference hole;
a reading sensor provided to face the back surface of the light transmissive plate and the back surface of the peripheral frame, the reading sensor being configured to read an image while moving over a range including the light transmissive plate and the peripheral frame; and
a controller configured to perform:
controlling the reading sensor to read a reading range including the reference hole to obtain a read image;
determining a reference position in the reading range based on the read image obtained in the controlling, the reference position being determined to an intersection between the first inside edge and the second inside edge; and
setting a reading start position based on the reference position in the reading range, the reading start position being a position from which the reading sensor starts moving when the reading sensor reads the original.

2. The reading device according to claim 1 , wherein the first inside edge and the second inside edge intersect with each other at a right angle.

3. The reading device according to claim 1 , wherein the reference hole includes a T-shape including the first inside edge and the second inside edge.

4. The reading device according to claim 1 , wherein the controller is configured to further perform:
setting a search origin outside the reference hole and within a bent side of the first inside edge and the second inside edge, wherein the reading range is read in the controlling so that the reading range includes the reference hole and the search origin; and
searching a position of the first inside edge and a position of the second inside edge from the set search origin by using the read image obtained in the controlling to find the reference position.

5. The reading device according to claim 1 , wherein the controller is configured to further perform:
setting a search origin so that a fan shape formed by the first inside edge, the second inside edge, and a circular arc crossing the search origin has a central angle smaller than 180 degrees, wherein the reading range is read in the controlling so that the reading range includes the reference hole and the search origin; and
searching a position of the first inside edge and a position of the second inside edge from the set search origin by using the read image obtained in the controlling to find the reference position.

6. The reading device according to claim 1 , wherein the reference hole further includes an outside edge to define an outside part of the reference hole,
wherein the first inside edge and the second inside edge are smaller than the outside edge.

7. The reading device according to claim 1 , wherein reference hole includes an L-shape including the first inside edge and the second inside edge.

8. The reading device according to claim 1 , wherein the reading sensor includes a contact image sensor,
wherein the contact image sensor includes:
a light source configured to emit light and located at one end side of a light guide in a main scanning direction;
the light guide extending in the main scanning direction and configured to guide emitted light from the light source in the main scanning direction; and
a line sensor configured to receive reflection light which is emitted from the light source and reflected by the peripheral frame or the original placed on the light transmissive plate.

9. The reading device according to claim 1 , wherein the light transmissive plate is a platen glass.

10. The reading device according to claim 1 , wherein the peripheral frame supports and surrounds a periphery of the light transmissive plate.

11. The reading device according to claim 1 , further comprising a motor configured to move the reading sensor in a sub scanning direction.

12. The reading device according to claim 1 , further comprising a motor configured to move the reading sensor in a sub scanning direction,
wherein the reading sensor is configured to move in the sub scanning direction below the light transmissive plate and the peripheral frame by rotation of the motor.

13. A reading device comprising:
a light transmissive plate having a front surface on which an original is placed, and a back surface;
a peripheral frame located adjacent to the light transmissive plate, the peripheral frame including a back surface in which a reference hole is formed, the reference hole having first and second segments, the first segment including a first inside edge and the second segment including a second inside edge intersecting with the first inside edge at an angle to define an inside part of the reference hole, an intersection between the first inside edge and the second inside edge being a reference position; and
a reading sensor provided to face the back surface of the light transmissive plate and the back surface of the peripheral frame, the reading sensor being configured to read an image while moving over a range including the light transmissive plate and the peripheral frame,
wherein a reading start position is defined based on the reference position in the range.

Assignees

• Brother Ind Ltd

Inventors

• Motoyama Toshiki
• Oyama Yoshihiro
• Okamoto Yoshihiro
• Shumiya Kazushi
• Aoyama Kentaro

Classifications

• H04N1/00816 Primary

  Determining the reading area, e.g. eliminating reading of margins · CPC title

• H04N1/00819

  Self-calibrating reading means · CPC title

• H04N1/02835

  in combination with a light guide, e.g. optical fibre, glass plate (light-guides per se G02B6/00) · CPC title

• H04N1/0313 Primary

  Direct contact pick-up heads, i.e. heads having no array of elements to project the scanned image elements onto the photodectors · CPC title

• H04N1/047

  Detection, control or error compensation of scanning velocity or position ({H04N1/0402 and } H04N1/17 take precedence) · CPC title