JPH04351160A - Picture reader - Google Patents

Abstract

PURPOSE:To save number of components, to save power and to make the size small by using one light source for a light source lighting a display panel and a light source used to read a picture from an original. CONSTITUTION:A scatter plate 2 scattering a light from light sources 3A, 3B to light up a rear side of a display panel 1 is provided to the reader, and also a display section 4, an original read section 5, an original platen 6 and a feed roller 7 feeding the original 8 along a read position 6A on the original platen 6 are provided to the reader. Then the original read section 5 uses a line image sensor 9 on which sensor elements are arranged in a direction perpendicular to the paper to receive and read the reflected light from a picture on the original 8. That is, the light from the light source 3A in the light sources 3A, 3B lighting up the rear side of the display panel 1 is collected by a condenser lens 10 and the light is emitted to the read position 6A on the original platen 6 and the light reflected in the original 8 at the read position 6A is received by the sensor 9 via a SELFOC lens 11.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to an image reading device.
Specifically, the present invention relates to an image reading device for image processing equipment that includes an optical display section and an image reading section.

0002

[Background Art] In recent years, as information processing equipment has become more sophisticated and faster, there has been a strong tendency for power consumption to increase as the number of components has increased, and the development of technologies related to miniaturization and energy saving has been desired. ing. By the way, facsimiles and the like used for transmitting image information are equipped with back-illuminated optical display means for displaying messages and other information related to the information, and image reading means for reading images from original documents. Particularly in this type of equipment in which the display means requires a light source, both a light source for the display means and a light source for illuminating the document for image reading have conventionally been provided.

0003

[Problems to be Solved by the Invention] However, as mentioned above, providing dedicated light sources for both display means and image reading requires a corresponding amount of space, which goes against miniaturization. In addition, it is necessary to supply power to both to drive the light source, leading to an increase in cost and expenses.

An object of the present invention is to focus on such conventional problems, and in order to solve the problems, to provide an image reading device that can be made compact and save power by sharing the light source of the display means with the light source of the reading section. It's about doing.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a reading unit that guides light from a light source onto an original and reads an image on the original using an optical sensor; In an image reading device, the image reading device has a transmissive display section that is configured to irradiate light from the back side of a display panel capable of displaying information related to the original document, and a light source for irradiating the display panel and the original document. It is characterized by using the same light source as the light source for reading the image from above.

[0006]

[Operation] According to the present invention, the same light source illuminates the display panel of the display section from the back side and also guides the light to the document in the reading section, so it is necessary to provide separate light sources for the display section and the reading section. By reducing the number of light sources, it is possible to achieve downsizing and power savings.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail and specifically below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. here,
1 is a back-illuminated transmissive display panel such as a liquid crystal display device; 2
are provided along the back side of the display panel 1, and the light sources 3A,
It is a scattering plate that scatters light from 3B and supplies the display panel 1 from the back side, and in this example, two light sources 3A, 3
Each of B is composed of, for example, a cold cathode discharge tube.

[0009] For the display unit 4 having the above-mentioned configuration, 5
1 is a document reading section, 6 is a document table thereof, and 7 is a feed roller that feeds the document 8 along a reading position 6A on the document table 6.

In the document reading section 5 of this example, the reflected light from the image on the document 8 is received by a line-type image sensor 9 whose sensor elements are arranged perpendicular to the plane of the paper, and reading is performed. 10 is a condensing lens, 1
1 is a SELFOC lens for guiding the above-mentioned reflected light to the image sensor 9. That is, in this embodiment, two light sources 3A and 3 are used to illuminate the display panel 1 from the back side.
B, the light from one light source 3A is collected by the condensing lens 1.
0 and emits the light toward a reading position 6A on the document table 6.The light reflected from the document 8 at this reading position 6A is received by the image sensor 9 via the SELFOC lens 11. Ru.

[0011] In the image reading device configured as described above, the light source for the display section of the image processing equipment as described above can also be used for reading from the original, thereby eliminating the need to provide a dedicated light source. This allows the number of parts to be reduced and the overall device to be more compact, and further contributes to power savings.

Further, in the above embodiment, two light sources 3A and 3B were provided for the display section 4, and one of them was used for the reading section 5, but the number of light sources and the amount of light depend on the size of the display section 4 and the light intensity. The light source used in common for the reading unit 5 may also be set as desired depending on the purpose, etc.
The number and amount of light may be appropriately set depending on the sensitivity of the light source and the like. Furthermore, in the above embodiment, the condenser lens 10 was provided to guide the light from the light source 3A to the reading position 6A, but such light guide means is not limited to the condenser lens, and for example, an optical fiber, etc. It is also possible to use

FIG. 2 shows another embodiment of the invention. In this example, one light source 3 is shared by the display section 4 and the reading section 5. That is, 3 is a shared light source. The light from the light source 3 is supplied to the display section 4 via the light guide plate 21 provided along the back side of the scattering plate 2 of the display panel 1.
Light is supplied from the light source 3 to the reading unit 5 by a light guide member 23 provided to direct the light toward the contact image sensor 22 . Note that the light guide plate 21 may be made of, for example, fine glass and coated on the back side of the plate so as to diffusely reflect light only toward the display panel 1 side.
The light guide member 23 is also preferably of a selfoc lens type that guides light in a condensing manner toward the reading position 6A.

Next, the contact type image sensor applied to this embodiment will be explained with reference to FIG. Such a contact type image sensor 22 is a well-known one, and as shown in this figure, a light sensor 26 consisting of a line of light-receiving elements arranged in a line on the back side of a light-shielding mask 25 having a slit-shaped light-transmitting window 24 is provided. A base glass 27 for holding the sensor is attached to the upper surface of the mask 25. 28 is a protective glass provided on the lower surface side of the mask 25.

By arranging the contact type image sensor 22 having such a configuration at a position as shown in FIG.
The light beam 30 guided through the light guiding member 23 is guided through the light-transmitting window 24 of the image sensor 22 onto the original 8 as shown by the arrow, reflected at a minute area at the reading position 6A, and received by the optical sensor 26. be able to. In this way, the optical sensor 26 performs photoelectric conversion according to the change in the amount of reflected light when it receives light, and reads the image on the document.

[0016]

As explained above, according to the present invention, the light source for illuminating the display panel and the light source for reading the image from the document are the same light source.
The light source can be shared for reading and display,
This can contribute to reducing the number of parts, saving power, and downsizing the entire device and reducing costs.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram schematically showing an embodiment of the present invention.

FIG. 2 is a configuration diagram schematically showing another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing the configuration of a contact type image sensor applied to the embodiment of FIG. 2;

[Explanation of symbols]

1 Display panel 2 Scatter plate 3, 3A, 3B Light source 4 Display section 5 Reading section 6 Manuscript table 6A Reading position 8 Manuscript 9 Image sensor 11 Selfoc lens 21 Light guide plate 22 Close-contact image sensor 23 Light guiding member 24 Translucent window 26 Optical sensor 30 Luminous flux

Claims (1)

[Claims] Claim 1: A reading section that guides light from a light source onto a document and reads an image on the document using an optical sensor, and a display panel that can display information related to the reading section on the back side thereof. In an image reading device having a transmissive display section, the light source for illuminating the display panel and the light source for reading an image from the document are the same light source. An image reading device characterized by: