JPH0531448U - Image reader - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide an image reading device capable of accurately reading image information of an original regardless of the type of the original. [Structure] Document platen holder 1, document platen suitable for various documents,
For example, it is composed of a reflection original platen 2 and a mounted 35 mm slide original platen 3. Here, when various originals are placed on the original table suitable for the original, the distance between the original surface and the reading element is always the same. When reading a document, the document table for the document can be set on the document table holder 1 in accordance with the document to be read, and the image information of the document can be read. Therefore, any original can be easily set, and the distance between the original surface and the reading element can always be the same regardless of the type of original, so that good reading can be performed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an image reading device capable of reading image information.

[0002]

[Prior Art]

 Conventionally, most of the image reading apparatuses of this type can read only a reflective original document or only a transparent original document. Further, in an apparatus capable of reading both reflective and transmissive originals, the same original table was used for both reflective and transmissive originals to set an original as shown in FIG. That is, in the case of reading the transparent original 200, the mirror 202 is rotated by a predetermined amount, the light emitted from the light source 203 passes through the transparent original 200, and is coupled to the reading element 201 via the predetermined mirror and lens 204. I changed the optical path to read the image.

[0003]

[Problems to be solved by the device]

 However, in this type of image reading device, when a mounted transparent original is read on the same platen as the reflective original, it is difficult to set the original, and the distance between the original surface and the reading element depends on the mount. However, there was a drawback that the read image was blurred. Also, because the optical path is changed, it is necessary to newly take measures against stray light etc. in the optical path.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an image reading apparatus capable of accurately reading image information of an original regardless of the type of the original. ..

[0005]

[Means for Solving the Problems]

 In order to achieve this object, the image reading apparatus of the present invention makes it possible to replace the platen according to a reflective original and a transparent original.

[0006]

[Action]

 In the image reading apparatus of the present invention having the above-mentioned configuration, the document table can be replaced with a document table dedicated to the read document and read according to the type of the document.

[0007]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

First, the configuration of the entire image reading apparatus will be described with reference to FIG. The cover portion 13 connects a document table holder 1 for holding various document tables, a light source 5 for illuminating a document (not shown) placed on each document table, and a reflected light or a transmitted light from the document. A mirror 8 for guiding the image lens 9 is provided. Further, an image forming lens 9 for forming an image of reflected light or transmitted light from the document on the reading element 10 and a reading element 10 are arranged. A motor 11 for driving the platen holder 1 is arranged, and a wire rope 12 having both ends fixed to the platen holder 1 is wound around a shaft of the motor 11 by a predetermined amount. Therefore, the original table holder 1 can be moved by rotating the motor 11. Further, a light source unit 6 that holds the light source 5 and a rotary motor 7 whose shaft is fixed to the light source unit 6 are also arranged. Therefore, by rotating the rotary motor 7, the light source unit 6 can be moved to a predetermined position on the front surface side and the back surface side of the document table holder 1.

Next, the document table will be described with reference to FIG.

Although the platen holder 1 in FIG. 2 is actually incorporated in an image reading apparatus, only the platen holder 1 is separately shown here for the sake of easy understanding. FIG. 2 shows a reflection original platen 2, a mounted 35 mm slide original plate 3, and an original plate 4 on which several 35 mm slide originals can be set at once. The document table holder 1 has a plurality of projecting pieces 101 extending from the side surface for fixing the reflection document document table 2, the mounted 35 mm slide document table 3, and the document table 4. Further, at the bottom of the platen holder 1, a holding part 103 is provided extending from each side for holding the document platen 2 for the reflection document, the platen 3 for mounted 35 mm slide, and the platen 4. Further, each document table is provided with a recess 103 so as to be engaged with the protruding piece 101 of the document table holder 1.

Thus, for example, when the document to be read is a reflection document, the document table 2 can be set on the document table holder 1, and the reflection document can be placed on the set document table 2. In the case of a 35 mm slide original with a mount, the original table 3 can be set on the original table holder 1 and the mounted 35 mm slide original can be set at a predetermined position on the original table 3. In this case, the height of each platen is adjusted so that the distance between the document surface of the mounted 35 mm slide document and the reading element 10 is the same as that of the reflection document. In this way, the document table is selected according to the document to be read and mounted on the document table holder 1.

Next, switching of the light source will be described with reference to FIG.

First, when the power source of the image reading apparatus is turned on, the platen holder 1 moves to the position shown in FIG. 3 by rotating the motor 11 by a predetermined amount. Next, the light source unit 6 holding the light source 5 is placed at the position A on the back side of the document holder 1 by rotating the rotary motor 7 by a predetermined amount. Next, a switch (not shown) installed in the image reading device indicates what kind of original, that is, whether the original is a reflection original or a transparent original. When the given instruction is a reflective original, the light source unit 6 is held at the position A on the back side of the original holder 1. When the instruction is a transparent original, the light source unit 6 holding the light source 5 is arranged at the position B on the front surface side of the document holder 1 by rotating the rotary motor 7 by a predetermined amount.

Next, an actual reading operation will be described with reference to FIGS. 4 and 5.

FIG. 4 shows reading of a reflective original, and FIG. 5 shows reading of a transparent original. First, the reading of a reflective original will be described. First, the user sets the reflection original platen 2 on the original plate holder 1 and instructs a switch (not shown) that the original to be read is a reflection original. Based on the instruction, when the light source unit 6 is not arranged at the position of the back side of the document table holder 1 in FIG. 4 (position A in FIG. 3), the document table holder 1 is moved to the position in FIG. By moving the light source unit 6 by rotating the rotary motor 7 by a predetermined amount, the light source unit 6 is arranged at the position of the back side of the document holder 1 in the position of FIG. Further, when the light source unit 6 is arranged at the position of the back side of the document table holder 1 in FIG. 4 (the position of A in FIG. 3), the light source unit 6 is held in that state.

Next, the user places a reflection document (not shown) on the platen holder 1 at a predetermined position, and presses the reflection document with a document holder (not shown) so as not to shift the reflection document. After the reflection original is placed, wait until the scanning start instruction is given. Although it is not possible to describe in detail here how to start scanning, set scanning conditions, or transfer image data, this type of image scanning device is usually used in connection with a host computer to start scanning. Instructions are also issued by the host computer. This embodiment is also used by connecting to a host computer, and an instruction to start reading is also issued from the host computer. The image reading device that has received the reading start instruction rotates the motor 11 to move the platen holder 1 to the reading start position. Next, the light source 5 is turned on to irradiate the reflective original with light. The light reflected on the reflective original is guided to the imaging lens 9 by the mirror 8, and the image of the reflective original is imaged on the reading element 10 by the imaging lens 9. While reading the image of the reflection original one line at a time, the platen holder 1 is moved in the direction of the arrow shown in FIG. 4 to scan the area of the original to be read, and the reading is completed.

Next, with reference to FIG. 5, the reading of a transparent original here, a mounted 35 mm slide original, will be described. First, the user sets the mounted 35 mm slide original platen 3 on the platen holder 1 as in the case of the reflection original, and the original to be read by the switch (not shown) is a transparent original. Instruct. Based on the instruction, when the light source unit 6 is not arranged at the position of the front side of the document table holder 1 in FIG. 5 (position B in FIG. 3), the document table holder 1 is moved to the position in FIG. By moving the light source unit 6 by rotating the rotary motor 7 by a predetermined amount, the light source unit 6 is arranged at the position of FIG. 5 (the position of B in FIG. 3) on the front surface side of the document table holder 1. Further, when the light source unit 6 is arranged at the position of the front side of the document holder 1 in FIG. 5 (position B in FIG. 3), the light source unit 6 is held in that state.

Next, the user places a transparent document (not shown) on the document table holder 1 at a predetermined position, and holds the transparent document with a transparent document holder (not shown) so as not to shift it. Once the transparent original has been placed, wait until an instruction to start reading is given. When the reading start instruction is received from the host computer, the motor 11 is rotated to move the platen holder 1 to the reading start position. Next, when the light source 5 is turned on, the transparent original is irradiated with light, and the light transmitted through the transparent original is reflected by the mirror 8 and guided to the imaging lens 9, and the image of the transparent original is read by the imaging lens 9. An image is formed on the element 10. In this way, while reading the transparent original image line by line, the platen holder 1 is moved in the direction of the arrow shown in FIG. 5 to scan the range of the transparent original to be read, and the reading is completed.

The present invention is not limited to the embodiments described in detail above, and various modifications can be made without departing from the spirit of the invention. For example, in the present embodiment, only the manuscript table for the reflection manuscript and the manuscript table for the mounted 35 mm slide manuscript are shown, but a manuscript table dedicated to the manuscript may be similarly prepared for other manuscripts. However, it is necessary that the distance between the document surface and the reading element does not change when the original is set. Before starting scanning, the user used a switch to instruct whether the original to be read is a reflective original or a transparent original.However, similar to other reading conditions, the host computer determines whether the original is reflective or transparent. You may give instructions. Further, the moving means of the light source unit may be manual.

In addition, changes can be made without departing from the scope of the present invention.

[0021]

[Effect of the device]

 As is apparent from the above description, according to the present invention, since the platen can be exchanged according to the type of the original, any original can be easily set and the original surface and the reading element can be set regardless of the type of the original. Since the distance between them can always be the same, good reading is possible. It is possible to provide an image reading device that does not require additional measures for stray light in the optical path.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an overall configuration of an image reading apparatus.

FIG. 2 is a diagram illustrating a document table of the image reading apparatus.

FIG. 3 is a diagram illustrating switching of a light source of the image reading device.

FIG. 4 is a diagram illustrating reading of a reflective original by the image reading apparatus.

FIG. 5 is a diagram illustrating reading of a transparent original by the image reading apparatus.

FIG. 6 is a diagram illustrating reading of a transparent original by a conventional image reading apparatus.

[Explanation of symbols]

 1 Platen Holder 2 Document Platen for Reflective Documents 3 Mounted 35 mm Slide Document Platen 4 Mounted 35 mm Slide Document Platen 5 Light Source 6 Light Source Unit 7 Rotation Motor 8 Mirror 9 Imaging Lens 10 Reading Element 11 Motor

Claims (1)

[Scope of utility model registration request] 1. A document table on which a document is placed, a light source for irradiating the document with light, and an imaging lens for focusing reflected light or transmitted light from the document on a reading element. In the image reading device, the document table can be replaced according to a reflective original and a transparent original.