JPH04102363U - Illumination mechanism in image reading device - Google Patents

Abstract

(57) [Summary] [Purpose] To enable shadow-free irradiation of a document reading position with a single light source. [Structure] At least one pair of optical systems 1 that guide reflected light from the reading position of a document on a transparent paper guide plate 9 in two directions.
2 and 13 are arranged in a substantially inverted V shape. Image sensors 16 and 17 are arranged at the ends of the optical paths of optical systems 12 and 13, and optical images of the reading position of the original are formed on the image sensors 16 and 17. A light source 18 is provided on the vertical axis L with respect to the document reading position, and the light from this light source 18 is irradiated onto the document reading position on the paper guide plate 9 from the side where the image sensors 16 and 17 are arranged.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a contact sensor type image reading device, and more specifically, the present invention relates to a contact sensor type image reading device. This invention relates to an illumination mechanism for illumination.

0002

[Conventional technology]

As shown in FIG. 4, the conventional method disclosed in Japanese Patent Publication No. 59-42511 The light sources 1 and 2 of the image reading device are provided on both sides of the reading position 4 on the paper guide plate 3. There is. The optical system illuminates the original on the paper guide plate 3 by the light sources 1 and 2. 5 and 6, it is imaged onto image sensors 7 and 8 as a one-to-one erect real image.

0003

[Problem that the invention attempts to solve]

In the conventional configuration, two sets of light sources are required, and related parts are also required, making it difficult to There was a flaw in the overall size of the reading device.

0004 In addition, a light source must be installed in the space between the paper guide and the optical system. There is a problem that the size is limited.

[0005] It is also possible to place the light source on only one side of the reading position, but this will create a shadow at the reading position. There may be cases where The present invention aims to eliminate the above defects.

[0006]

[Means to solve the problem]

In order to achieve the above object, the present invention includes a light source 18 and a document that supports a document having a transparent part. A paper guide plate 9 is arranged to face the document onto which the light from the light source 18 is irradiated. at least a pair of mutual optical systems 12 and 13 arranged in a substantially inverted V shape with a large angle; A plurality of image sensors 16 and 17 are arranged oppositely on each optical path of 13. In the image reading device, the light source 18 is aligned with the reading position 15 of the document. The image sensor 16 of the paper guide plate 9 is positioned substantially on the vertical axis L, 17 arrangement side.

[0007]

[Effect]

The document on the paper guide plate 9 is placed on the vertical axis L with respect to the reading position of the document. The light from the light source 18 is irradiated, and a light image at the reading position of the document is transmitted to the optical systems 12 and 13. The images are formed on image sensors 16 and 17 by the following.

[0008]

【Example】

The configuration of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings. 9 is a paper guide supported by the body of the image reading device, and the paper guide is It is configured.

[0009] A paper conveying roller 10 connected to a drive system is disposed on the upper surface side of the paper guide 9. As the roller 10 rotates, the document 11 is conveyed on the paper guide 9 in the direction of the arrow. It is configured so that

0010 Below the paper guide 9 is a focusing rod lens array (product name SELFOC). A pair of optical systems 12 and 13 consisting of lenses (manufactured by Nippon Sheet Glass) are viewed from the side. They are arranged in an inverted V-shape and are supported by the reading unit 14.

[0011] The elongated upper ends of the pair of optical systems 12 and 13 are connected to the light on the upper surface of the paper guide 9. The reading position 15 faces the entire area of the reading position 15.

0012 The optical systems 12 and 13 overlap each other and are shifted in a direction transverse to the paper guide 9. The linear arrangement on the top surface of the paper guide 9 is made by the above arrangement and the inverted V-shaped arrangement. It is configured to guide the light image of the entire area of the reading position 15 downward as a one-to-one light image. Ru.

[0013] Below the optical systems 12 and 13, each consists of an elongated sensor module. Image sensors 16 and 17 are arranged.

[0014] 18 is located below the paper guide 9 and is disposed in the reading unit 14. A light source consisting of a light emitting diode (LED) that illuminates the document on the top surface of the paper guide 9. It is located on the substantially vertical axis L with respect to the reading position 15 of.

[0015] In the above configuration, when the original 11 moves on the paper guide 9 in the arrow direction in FIG. Then, the image of the original 11 at the reading position 15 is reflected by the light source that illuminates the reading position 15. 18 enters optical systems 12 and 13 and is coupled to image sensors 16 and 17. It is then converted into a digital electronic signal.

[0016] In this embodiment, the image for one line along the reading position 15 is divided into two parts, each of which is divided into two parts. An image is formed on corresponding image sensors 16 and 17.

[0017] In this example, a paper transport type was used as the document scanning method, but the paper was fixed. A method may also be used in which the reading unit 14 moves in the state.

[0018] In addition, as shown in Figure 3, the light from the light source is not directly irradiated onto the manuscript paper surface. Image sensors 16 and 17 are arranged on the vertical axis L of the reading position 15 on the paper guide 9. A light source 18 is placed on the side, and the light from the light source 18 is passed through the disturbance light prevention cover 19. The light is guided to the reflecting mirrors 20 and 21 placed on the left and right sides of the light source 18, and the mirrors of the reflecting mirrors 20 and 21 The light reflected by the surface may be irradiated onto the reading position 15 from both sides thereof.

[0019]

【effect】

Since the present invention is constructed as described above, only one light source is required and the structure is simple. , compactness can be achieved. In addition, there is more space for placing the light source, so the size of the light source is not limited. .

[0020] Also, if the light from the light source is directly irradiated onto the paper guide, the light will not affect the document paper. Since the incident angle is approximately 90 degrees, the illumination efficiency is good.

[Brief explanation of drawings]

FIG. 1 is an explanatory side view showing the configuration of an image reading device.

FIG. 2 is an explanatory external view showing the configuration of an image reading device.

FIG. 3 is a side explanatory view showing another embodiment.

FIG. 4 is a side explanatory diagram of the conventional technology.

[Explanation of symbols]

1 light source 2 Light source 3 Paper guide 4 Reading position 5 Optical system 6 Optical system 7 Image sensor 8 Image sensor 9 Paper guide 10 Paper transport roller 11 Manuscript 12 Optical system 13 Optical system 14 Reading unit 15 Reading position 16 Image sensor 17 Image sensor 18 Light source 19 Cover 20 Reflector 21 Reflector

Claims (1)

[Scope of utility model registration request] 1. A light source 18, a paper guide plate 9 for supporting a document having a transparent portion, and a light source 18 that extends over the entire area of the document reading position 15 facing the document to which the light from the light source 18 is irradiated. At least a pair of optical systems 12 and 13 that guide reflected light in two directions are arranged at an angle to each other in a substantially inverted V shape.
and a plurality of image sensors 16 and 17 arranged oppositely on the respective optical paths of the optical systems 12 and 13. An illumination mechanism characterized in that it is located on a vertical axis L and is disposed on a side of the paper guide plate 9 on which the image sensors 16 and 17 are arranged.