JP2003219110A5

JP2003219110A5 -

Info

Publication number: JP2003219110A5
Application number: JP2002013525A
Authority: JP
Filing date: 2002-01-22
Publication date: 2005-04-14

Description

【００１２】
【課題を解決するための手段】
上記目的を達成するために、本発明の画像読み取り装置は、原稿の光学像を電気信号に変換する光電変換手段と、予め設定された複数の不連続の倍率で、前記光電変換手段上に前記原稿の光学像を合焦させるズーム機能を有する光学手段と、前記複数の倍率のいずれかを選択する選択手段と、前記選択手段により選択された倍率となるように前記光学手段のズーム機能を制御する制御手段とを有し、反射原稿及び透過原稿の両方を、各原稿から前記光電変換手段までの間を同一の光路を介して読み取り可能であって、前記選択手段は、反射原稿を読み取る際に第１の倍率を選択し、透過原稿を読み取る際には前記第１の倍率よりも高い第２の倍率を選択する。 [0012]
[Means for Solving the Problems]
In order to achieve the above object, an image reading apparatus according to the present invention comprises photoelectric conversion means for converting an optical image of a document into an electric signal, and the photoelectric conversion means with a plurality of preset discontinuous magnifications. An optical unit having a zoom function to focus an optical image of a document, a selection unit to select one of the plurality of magnifications, and a zoom function of the optical unit to control the magnification selected by the selection unit and control means possess for, reflective original and both the transparent original, a period from the original to said photoelectric converting means comprising readable through the same optical path, said selecting means, when reading the reflective original The first magnification is selected, and a second magnification higher than the first magnification is selected when reading a transparent original .

また、原稿の光学像を電気信号に変換する光電変換手段と、予め設定された複数の不連続の倍率で、前記光電変換手段上に前記原稿の光学像を合焦させるズーム機能を有する光学手段とを有し、反射原稿及び透過原稿の両方を、各原稿から前記光電変換手段までの間を同一の光路を介して読み取り可能な画像読み取り装置における本発明の画像読み取り方法は、前記複数の倍率のいずれかを選択する選択工程と、前記選択工程により選択された倍率となるように前記光学手段のズーム機能を制御する制御工程とを有し、前記選択工程では、反射原稿を読み取る際に第１の倍率を選択し、透過原稿を読み取る際には前記第１の倍率よりも高い第２の倍率を選択する。 An optical means having photoelectric conversion means for converting an optical image of a document into an electrical signal, and a zoom function for focusing the optical image of the original on the photoelectric conversion means at a plurality of preset discontinuous magnifications. possess the door, both the reflective original and a transmissive original, the image reading method of the present invention in an image reading apparatus capable of reading through the same optical path between the each original to the photoelectric conversion means, said plurality of magnifications a selection step of selecting either, have a controlling process of controlling the zoom function of the optical means so as to be the ratio selected by the selecting step, in the selection step, first when reading the reflective original A magnification of 1 is selected, and a second magnification higher than the first magnification is selected when reading a transparent original .

Claims

Photoelectric conversion means for converting an optical image of a document into an electrical signal;
An optical means having a zoom function for focusing an optical image of the document on the photoelectric conversion means at a plurality of discontinuous magnifications set in advance;
Selection means for selecting one of the plurality of magnifications;
Control means for controlling the zoom function of the optical means to achieve the magnification selected by the selection means ;
Both the reflective original and the transmissive original can be read through the same optical path from each original to the photoelectric conversion means,
The image reading apparatus , wherein the selection unit selects a first magnification when reading a reflective original, and selects a second magnification higher than the first magnification when reading a transparent original .

The apparatus further comprises detection means for detecting a reading area of the document,
When reading the transparent original, the selection means, the image reading according to claim 1, characterized in that selecting a magnification based of the plurality of magnifications, the reading area of the document detected by the detection means apparatus.

3. The image reading apparatus according to claim 2 , wherein the selection unit selects a magnification at which the available resolution of the photoelectric conversion unit is maximized among the plurality of magnifications.

The selection unit selects a second magnification higher than the first magnification when the width in the main scanning direction of the reading area detected by the detection unit is equal to or greater than a predetermined width when reading a transparent original. and, an image reading apparatus according to claim 2 or 3, characterized in that selecting a higher third magnification than said second magnification in the case of less than the predetermined width.

The apparatus further comprises scanning means for moving the document reading position in the sub-scanning direction
The image reading apparatus according to any one of claims 1 to 4 , wherein the scanning unit controls a reading pitch in accordance with a magnification selected by the selection unit.

Photoelectric conversion means for converting an optical image of a document into an electrical signal; and optical means having a zoom function for focusing the optical image of the document on the photoelectric conversion means at a plurality of preset discontinuous magnifications. Yes, and reflective original and both transparent original, an image reading method in an image reading apparatus capable of reading through the same optical path between the each original to the photoelectric conversion means,
A selection step of selecting one of the plurality of magnifications;
And controlling the zoom function of the optical unit to achieve the magnification selected by the selection step ,
In the image reading method , in the selection step, a first magnification is selected when reading a reflection original, and a second magnification higher than the first magnification is selected when reading a transmission original .

The method further includes a detection step of detecting a reading area of the document,
7. The image reading method according to claim 6 , wherein, in reading the transparent original, in the selection step, the magnification is selected based on the reading area of the original detected in the detection step among the plurality of magnifications. Method.

8. The image reading method according to claim 7 , wherein in the selection step, a magnification at which the available resolution of the photoelectric conversion unit is maximized is selected from the plurality of magnifications.

In the selection step, when reading a transparent original, if the width in the main scanning direction of the reading area detected in the detection step is equal to or greater than a predetermined width, a second magnification higher than the first magnification is selected and, an image reading method according to claim 7 or 8, characterized in that selecting a higher third magnification than said second magnification in the case of less than the predetermined width.

The image reading apparatus further comprises scanning means for moving the reading position of the document in the sub scanning direction,
The image reading method according to any one of claims 6 to 9 , further comprising the step of determining the reading pitch by the scanning means according to the magnification selected in the selecting step.

A program that can be executed by an information processing apparatus having a program code for realizing the image reading method according to any one of claims 6 to 10 .

A storage medium storing the program according to claim 11 .