JPH06290257A - Image input/output device - Google Patents

Abstract

PURPOSE:To provide the image input/output device which is small in size, lightweight, and simple in structure, and can easily be mounted by forming a document reader and a handwriting input device into the body. CONSTITUTION:The image input/output device equipped with a two-dimensional contact type photodetecting element array and a display part is provided with a light reflecting filter 10 which reflects light of wavelength lambda2 between the photodetecting element of a read part 1 and a document surface 13 and also has a document read array 5 which reads a document image by photodetecting the light of wavelength 21 reflected by the document surface 13 and a handwriting input array 5 which reads a handwriting input image by photodetecting the light of wavelength lambda2 reflected by the light reflecting filter 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input / output device having image reading, handwriting input and display functions,
In particular, it relates to a small, lightweight, low cost image input / output device.

[0002]

2. Description of the Related Art An image input / output device includes a document reading device as a reading unit for reading a document, a handwriting input device for inputting information by handwriting, and a flat display device as an information display unit.
The functions of various types of devices are incorporated into an integrated device.

In a conventional image input / output device, a two-dimensional contact type light receiving element array (Japanese Patent Laid-Open No. 64-62) is used as a document reading device.
(See Japanese Patent Laid-Open No. 980), a handwriting input device includes a pressure-sensitive contact input device, an electrostatic conduction input device, a magnetic induction input device, and the like, and a flat display device includes a liquid crystal display device ( LCD), electroluminescence display (ELD), electrochromic display (ECD)
Etc., and there were various methods for combining them and the structure of the device.

Now, a two-dimensional contact type light receiving element array as an image reading apparatus will be described. The two-dimensional contact type light receiving element array is a light receiving element array which is an assembly of light receiving elements on a transparent substrate and has the same width as the document width. Are parallel to each other, and the light receiving elements are arranged in a two-dimensional matrix in the row and column directions. A photodiode is used as the light receiving element. In such a two-dimensional contact type light receiving element array, the light incident from the back side of the transparent substrate is reflected by the document surface through the light collecting portion and is incident on the light receiving element which is the photoelectric conversion portion. A photocurrent is generated by the reflected light and is output as an electric signal.

[0005]

However, since the above-mentioned conventional image input / output device is equipped with three types of devices, that is, a two-dimensional contact type light receiving element array, a flat panel display device, and a handwriting input device, There is a problem that the entire device becomes large and heavy, the handling becomes inconvenient, and the mounting method of the device becomes complicated and the cost becomes high.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a low-cost image input / output device which is small in size, lightweight, and simple in structure.

[0007]

The invention according to claim 1 for solving the above-mentioned problems of the prior art, is a reading section comprising light-receiving elements arranged two-dimensionally in the row direction and the column direction, and a plane display. In an image input / output device including a display unit including a device, a reflection layer that reflects a part of light incident from the back side of the reading unit is provided between the reading unit and the document surface, and is reflected by the document surface. And a second light receiving element group for receiving the first light and reading the image on the original surface, and a second light receiving element group for receiving the second light reflected by the reflective layer and reading the handwritten input image. Is included in the reading unit.

According to a second aspect of the invention for solving the problems of the conventional example, in the image input / output device according to the first aspect, the first light is light of a first wavelength, and Two
Is a light of a second wavelength, the reflection layer is a light reflection filter that reflects the light of the second wavelength, and the second light is applied so as to cover the light receiving surface of the first light receiving element group. A first absorption filter that absorbs light of the first wavelength is formed, and a second absorption filter that absorbs light of the first wavelength is formed so as to cover the light receiving surface of the second light receiving element group. Is characterized by.

According to a third aspect of the present invention for solving the above-mentioned problems of the conventional example, in the image input / output device according to the first aspect, the reflecting layer is formed between the second light receiving element group and the document surface. It is characterized by being provided between them.

[0010]

According to the first aspect of the invention, a reflecting layer is provided between the reading section and the document surface for reflecting a part of the light incident from the back surface of the reading section, and the incident light is reflected by the document surface. An image having a first light receiving element group that receives the first light to read the document and a second light receiving element group that receives the second light reflected by the reflective layer to read the handwritten input image in the reading unit. Since it is an input / output device, both the original reading and the handwriting input can be performed by the reading section consisting of a plurality of light receiving elements arranged in a two-dimensional array on a single substrate, and the image input / output device can be made compact and lightweight. The cost can be reduced, and the structure and mounting method of the device can be simplified.

According to the second aspect of the present invention, the first light used for reading the original is the first wavelength (λ1), and the second light used for reading the handwritten input image is the second wavelength (λ2). ) Is provided between the reading section and the document surface, and a first absorption filter for absorbing the light of the wavelength λ2 is provided so as to cover the first light receiving element group and to have the light reflection filter for reflecting the light of the wavelength λ2. The image input / output device according to claim 1, further comprising a second absorption filter for absorbing the light of wavelength λ1 so as to cover the second light receiving element group, so that the light of wavelength λ1 is transmitted through the light reflection filter. Then, the light is reflected by the document surface, received by the first light receiving element group, and the image of the document is read.
Light is reflected by the light reflection filter and received by the second light receiving element group to read the handwritten input image, and only the light of wavelength λ1 for reading the original is incident on the first light receiving element group. Since only the light of wavelength λ2 for handwriting input can be made incident on the second light receiving element group, a high resolution reading can be performed without mixing the image of the original with the image of the handwriting input. .

According to a third aspect of the present invention, a reflection layer is provided between the second light receiving element group and the document surface so that the reflected light is incident on the second light receiving element group. Since this is the image input / output device, it is possible to form an image input / output device that can be used for both document reading and handwriting input with a simple structure.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an enlarged cross-sectional explanatory view when reading an original or inputting handwriting in an image input / output device according to an embodiment of the present invention. This embodiment (first embodiment)
As shown in FIG. 1, the image input / output device includes a reading unit 1 having a light receiving element array for performing photoelectric conversion for reading an original and inputting a handwriting, and a flat display device provided above the reading unit 1. And part 2.

In the reading unit 1, a plurality of light receiving elements are formed in a two-dimensional matrix in the row direction and the column direction on the lower surface of a substrate 1'made of a light transmissive member such as glass, quartz or ceramics. Each wiring for signal reading is formed.

In particular, the light receiving element array formed in the main scanning direction in the reading section 1 of the present embodiment is composed of an original reading array 5 and a handwriting input array 6, and the original reading array 5 and The handwriting input array 6 and the handwriting input array 6 are alternately arranged for each column to form a two-dimensional contact type light receiving element array.

In the original reading array 5, the lower surface of the light receiving element is covered with a long light absorption filter 7, and similarly,
The handwriting input array 6 is covered with a long light absorption filter 8. By these two types of light absorption filters 7 and 8, it is possible to make light of different specific wavelength bands enter the document reading array 5 and the handwriting input array 6. Further, between the light absorption filter 7 and the light absorption filter 8, there is a daylighting section 4 to which light is incident from the outside.

Then, in order to keep the distances between the original reading array 5 and the handwriting input array 6 and the original surface 13 constant and protect the light absorption filters 7 and 8 and the light receiving element arrays 5 and 6, the substrate A gap maintaining layer 12 made of a translucent member is provided so as to cover the entire lower surface of 1 ', and a filter portion 3 is further formed below the gap maintaining layer 12.
The filter unit 3 has a two-layer structure in which the light absorption filter 9 is formed below the light reflection filter 10.

That is, on the lower surface of the substrate 1 ', a two-dimensional contact type light receiving element array consisting of an original reading array 5 and a handwriting input array 6, light absorption filters 7 and 8, a gap maintaining layer 12, and a filter section 3 are provided. Are closely attached to each other to form the reading unit 1. In addition, the gap maintaining layer 1
2 includes an original reading array 5 and a handwriting input array 6
And the filter part 3 are formed so as to have a constant distance.

A non-luminous flat display device such as a liquid crystal display device (LCD) or an electrochromic display device (ECD) is provided as a display unit 2 on the substrate 1'of the reading unit 1. There is.

Next, the configuration of each part of the image input / output apparatus of the first embodiment will be specifically described. The feature of this embodiment is that the light for reading the original (wavelength λ1) and the light for inputting the handwriting (wavelength λ2) have different wavelengths, and the light of wavelength λ1 is reflected on the original surface 13. The light having the wavelength λ2 read by the original reading array 5 is reflected by the light reflection filter 10 of the filter unit 3 before reaching the original surface 13 and read by the handwriting input array 6.

The original reading array 5 and the handwriting input array 6 forming the two-dimensional contact type light receiving element array of the image input / output apparatus of the present embodiment are composed of the same light receiving element group, and By covering the light receiving elements with optical filters (light absorption filters 7 and 8) having the same shape and characteristics but different characteristics, the light beams of different wavelength bands are provided to the original reading array 5 and the handwriting input array 6. Is incident. The light receiving element is CdSe, amorphous Si,
The photodiode uses a semiconductor such as polycrystalline silicon (poly-Si).

The light used for reading the manuscript is external light of wavelength λ1, and of the light-receiving element array, only the light of wavelength λ1 reflected on the manuscript surface 13 enters the manuscript reading array 5 and is photoelectrically converted. The light absorption filter 7 is formed so as to cover the lower surface of the light receiving element. Here, the light absorption filter 7 transmits the light of the wavelength λ1 but absorbs the light of the wavelength λ2 emitted from the handwriting input pen 14, so that the light of the wavelength λ2 does not reach the original reading array 5. , Only light of wavelength λ1 is incident.

On the other hand, handwriting input can be performed in the shadow mode and the light pen mode. The shadow mode is a mode in which the shadow created by the external light and the handwriting input pen 14 is read by image processing. Light pen mode has a wavelength of λ2
The handwriting input is performed using a light pen provided with a light emitting unit 15 that emits the light. Since the handwriting input array 6 is covered with the light absorption filter 8 which transmits the light of wavelength λ2 reflected by the light reflection filter 10 and absorbs the light of wavelength λ1 reflected by the document surface, The light of λ1 does not reach, but only the light of wavelength λ2 enters.

As described above, by providing the document reading array 5 and the handwriting input array 6 with filters that selectively absorb light of unnecessary wavelengths and transmit light of required wavelengths, respectively. , The light for reading the original (wavelength λ1) is incident on the handwriting input array 6 or the light for inputting the handwriting (wavelength λ2
) Is prevented from entering the document reading array 5, and deterioration of handwriting input detection accuracy and document reading reproducibility can be prevented.

Next, each filter in the first embodiment will be described. The filter part 3 provided below the gap maintaining layer 12 is formed by closely stacking the light reflecting filter 10 and the light absorbing filter 9 on the gap maintaining layer 12. That is, in FIG. 1, the structure in which the light reflection filter 10 for reflecting the light of the wavelength λ2 is inserted between the light absorption filter 9 for absorbing the light of the wavelength λ2 used for the handwriting input and the gap maintaining layer 12 is used. Has become.

The light reflection filter 10 reflects light of wavelength λ2 and makes it incident on the handwriting input light receiving element 5'shown in FIG. Further, since the light absorption filter 9 has a narrow reflection wavelength band of the light reflection filter 10, the light absorption filter 9 absorbs the light near the wavelength λ2 transmitted through the light reflection filter 10, and the light for handwriting input reaches the document surface 13. It is provided for the purpose of clearly discriminating the wavelength for reading the original from the wavelength for inputting the handwriting. Further, the light absorption filter 9 is for enabling handwriting input even when the document is not in close contact with the filter unit 3. That is, the light absorption filter 9 is for absorbing the light in the vicinity of the wavelength λ2 of the external light incident from the document side and preventing the light from being superimposed on the input image from the pen.

Here, the characteristics of the light absorption filters 7, 8 and 9 and the light reflection filter 10 are shown in FIG.
This will be described with reference to the optical characteristic diagram of (b). Figure 2 (a) shows
FIG. 2B is an absorption spectrum characteristic diagram showing absorption characteristics of the light absorption filters 7 and 9 and the light absorption filter 8.
FIG. 4 is a reflection spectrum characteristic diagram showing the reflection characteristic of the light reflection filter 10.

The light absorption filters 7 and 9 have a sufficiently high transmittance for wavelengths near the short wavelength λ1 used for reading the original, but as the wavelength becomes longer, the transmittance decreases, so that the wavelength near the long wavelength λ2 for handwriting input. Has a characteristic of hardly transmitting (see FIG. 2 (a) -1). On the contrary, the light absorption filter 8 has a characteristic that the transmittance is extremely low near the short wavelength λ1 but is high near the long wavelength λ2 (see FIG. 2 (a) -2).

The light reflection filter 10 is shown in FIG.
As shown in (b), a reflection spectrum having a long wavelength λ2 as a peak is shown, and a wavelength range for reflection is narrow, and a sharp reflection band is formed.

Here, in order to clearly distinguish the wavelengths of light incident on the original reading array 5 and the handwriting input array 6 to obtain a good S / N ratio and resolution, FIG. At the wavelength λx at which the absorption spectra of the light absorption filters 7 and 9 intersect with the absorption spectrum of the light absorption filter 8, the transmittances of the light absorption filters 7 and 9 and the light absorption filter 8 are both 10% or less. Desirably, and also in FIG.
The reflectance of the light reflection filter 10 of (b) is also preferably 10% or less.

Further, assuming that the image input / output device is used indoors, the wavelength λ1 for reading the original and the wavelength λ2 for inputting the handwriting are selected from the three bright line spectral lines of the three-wavelength fluorescent tube. If you choose from, you can use the light effectively.
The wavelength of the emission line spectrum of the three-wavelength fluorescent tube is about 440 nm, although it varies slightly depending on the type of fluorescent material and the manufacturing method.
Since the wavelengths are 550 nm and 610 nm, wavelength λ1 and wavelength λ2
Is preferably selected from these three wavelengths.

The materials of the light absorption filters 7, 8 and 9 are
Resins including organic dyes, organic pigments, and inorganic pigments can be applied, and those materials can be used as the light receiving elements of the original reading array 5 and the handwriting input array 6 by a method such as spin coating, roll coating, printing, and electrodeposition. It is formed directly on the lower surface of the substrate 1 ′ so as to cover it.

Further, as the light reflection filter 10, a dielectric multi-layer film in which a high-refractive index dielectric material and a low-refractive index dielectric material are alternately laminated, or two types having the same spiral pitch and different handedness A laminated body of cholesteric liquid crystal is used.

Examples of the latter cholesteric liquid crystal include low molecular weight liquid crystal, high molecular weight liquid crystal, low molecular weight liquid crystal gelated by cross-linking of the added polymer, and polymer dispersed liquid crystal. Of these, the one having a low viscosity is sandwiched between two glass or plastic films to form a liquid crystal cell, and the liquid crystal cell is attached to the gap maintaining layer 12 of the substrate 1 ′ to form the light reflection filter 10. To form. For a highly viscous material, the light reflection filter 10 may be directly formed on the gap maintaining layer 12 by a method such as coating, vapor deposition, and electrodeposition.
The liquid crystal layer formed by the above method on another transparent substrate may be attached to the gap maintaining layer 12 to form the light reflection filter 10.

The gap maintaining layer 12 is provided to keep the distance between the light receiving element and the document surface 13 constant and to protect the document reading array 5 and the handwriting input array 6. A laminated structure may be used, and as the material, resin materials such as acrylic resin, epoxy resin, polycarbonate, etc., as well as silicon dioxide (SiO ₂ ) and silicon nitride (SiN) are used.
Inorganic materials such as x) and borate glass can be used. Then, these materials are directly formed into a film on the lower surface of the substrate 1'on which the light receiving element array is formed by a method such as spin coating, roll coating, printing, electrodeposition, vapor deposition, or a sheet once formed. The gap maintaining layer 12 is formed by applying it to the substrate 1 '.

Here, the value of the thickness d of the gap maintaining layer 12 affects the optical path of the light reflected by the document surface 13 and the light reflection filter 10, and therefore affects the resolution of document reading and handwriting input. Is. Next, how to set the value of the thickness d of the gap maintaining member 12 will be described.

When the gap maintaining layer 12 is thin and the ratio d / p between the thickness d of the gap maintaining layer 12 and the pixel pitch p of the light receiving element array is 0.1 or less, the manuscript surface 13 or the light reflection filter 10 is used. The light scattered at 2 spreads only slightly, and most of the light goes out of the lighting unit 4 again, so that the light cannot be effectively used.

On the other hand, the gap maintaining layer 12 is thick and d / p
If the number is 5 or more, the document surface 13 or the light reflection filter 1
The light scattered by 0 spreads widely and is incident on the adjacent pixels, which lowers the resolution of the original reading and the handwriting input. Therefore, d / p is 0.1
The thickness of the gap maintaining layer 12 may be set so as to fall within the range of ˜5, and more preferably within the range of 0.5˜2.

Next, the manuscript reading operation and the handwriting input operation in the image input / output apparatus having the above-mentioned structure will be described with reference to FIG. First, of the light incident from the outside, the light a having a short wavelength λ1 is transmitted through the flat display device 2 and the substrate 1 ',
The light is incident on the gap maintaining layer 12 from the lighting unit 4 of the reading unit 1, passes through the light reflection filter 10 and the light absorption filter 9 as they are, and the document surface 1 placed under the filter unit 3
It is reflected at 3 and scattered. Light a with scattered wavelength λ1
Is again the light absorption filter 9 and the light reflection filter 10.
To the gap maintaining layer 12 and the light absorbing filter 7 to enter the original reading light receiving element 5 '.
Then, the original is read by reading the photocurrent generated in the original reading light receiving element 5'in accordance with the brightness of the reflected light and performing image processing.

The light a of wavelength λ1 scattered on the document surface 13 also goes toward the handwriting input light receiving element 6 ', but is absorbed by the light absorption filter 8 so that it is handwritten input light receiving element. There is no incidence on 6 '. That is, the handwriting input array 6 does not operate at the time of reading a document.

On the other hand, of the light incident from the outside, the light b having the wavelength λ2 emitted from the light emitting portion 15 at the tip of the handwriting input pen 14 is the same as the light having the wavelength λ1. After passing through the gap maintaining layer 12, the light reaches the light reflection filter 10. Since the light of wavelength λ 2 is reflected by the light reflection filter 10, it does not reach the document surface 13 and passes through the light absorption filter 8 and enters the handwriting input light receiving element 6 ′, and is photoelectrically converted. Handwritten information can be read. The position of the pen tip can be detected by appropriately image-processing the output from the handwriting input light-receiving element 6 '.

Of the light b having the wavelength λ2 reflected by the light reflection filter 10, the component toward the light receiving element 5'for reading the original is absorbed by the light absorbing filter 7, so the light receiving element 5 for reading the original is read. There is no incidence on ′. Therefore, at the time of handwriting input, the document reading array 5 does not operate.

In this way, according to the image input / output device of this embodiment, the operation of reading an original and inputting handwriting can be performed without interfering with each other by using the single substrate 1 '. .

According to the image input / output apparatus of this embodiment (first embodiment), the light a (wavelength λ1) for reading the original and the light b (wavelength λ2) for handwriting input have different wavelengths. And the wavelength λ
A light reflection filter 10 which reflects the light of No. 2 before reaching the original surface 13 and transmits the light of wavelength λ1 is provided, and the original reading array 5 is covered with a light absorption filter 7 which absorbs the wavelength λ2. The writing input array 6 is covered with a light absorption filter 8 that absorbs the wavelength λ1 so that each light receiving element selectively absorbs light of an unnecessary wavelength and transmits light of a required wavelength. Therefore, the original reading array 5
Since the handwriting input array 6 and the handwriting input array 6 are arranged on the same substrate 1 ', both the original reading and the handwriting input can be performed on the single substrate 1'. This eliminates the need for a handwriting input device formed separately from the image reading device, and has the effect of significantly reducing the size and weight of the image input / output device.

Next, a second embodiment of the present invention will be described with reference to FIG.
Will be explained. FIG. 3 is an enlarged cross-sectional explanatory view of the image input / output device of the second embodiment. The image input / output device of the second embodiment is similar to the image input / output device of the first embodiment in that
It is composed of a reading section 1 having a three-dimensional contact type light receiving element array and a display section 2 composed of a flat display device.

In the two-dimensional close contact type light receiving element array of the reading section 1, the original reading array 5 and the handwriting input array 6 are alternately arranged on every one row on the lower surface of the substrate 1 '. A light-collecting part 4 from which light is incident from the outside is formed between and, and like the first embodiment, all the light-receiving elements themselves have the same characteristics. The transparent gap maintaining layer 12 is formed so as to cover the entire two-dimensional contact type light receiving element array.
Are formed, and the distance between the document surface 13 and the document reading array 5 and the handwriting input array 6 is kept constant.

Further, as a characteristic of the second embodiment, as shown in FIG. 3, the gap is wider than the width of the handwriting input light receiving element 6'at a position corresponding to the lower portion of the handwriting input array 6. A light reflector 18 is provided so as to closely contact the lower surface of the sustain layer 12 so as to cover the lower surface and reflect light. The light reflector 18 reflects the light incident from the daylighting section 4 to receive the handwriting input light receiving element 6 '.
Is to be incident on.

As the light reflector 18, aluminum (A
l), silver (Ag) and other high-reflectance metal materials, as well as high-refractive-index dielectrics such as zinc sulfide (ZnS) and low-refractive-index dielectrics such as silicon dioxide (SiO ₂ ) alternately. A laminated dielectric multilayer film can be applied. The surface of the light reflector 18 may be either a mirror surface or a scattering surface, and the thickness thereof is sufficient to reflect the incident light and does not deteriorate the resolution of the original reading light receiving element 5 '. It is necessary to form in a range. For example, the thickness of the light reflector 18 when a metal material is used is preferably in the range of 200 nm to 2 μm.

Further, the light reflector 18 needs to be formed in a size enough to cover the handwriting input array 6 so that sufficient light is incident on the handwriting input light receiving element 6 '. The area (S1-S2) obtained by subtracting the area (S2) of the handwriting input light-receiving element 5'from the area (S1) of the light reflector 18 influences the amount of light incident on the handwriting input array 6, and is therefore the substrate. It is desirable that the ratio {(S1-S2) / S} of the subtracted area (S1-S2) to the total area (S) of 1'is 0.1 or more.

However, if the light reflector 18 is too large, the light reflected by the light reflector 18 will be incident on the adjacent original reading light receiving element 5 ', so that the original reading light receiving element 5'shown in FIG. It is desirable that the ratio d / x of the distance x to the light reflector 18 and the thickness d of the gap maintaining layer 12 be 2 or less. The thickness of the gap maintaining layer 12 is formed in the same range as in the first embodiment.

Next, a method of reading an original and inputting handwriting in the image input / output apparatus of the second embodiment will be described. In the second embodiment, the handwriting input is performed by reading the position of the shadow formed when the user presses the handwriting input pen 14 on the display unit 2 under external light. Then, of the incident light from above, the original is read by the light reflected on the original surface 13, and the input for handwriting is read by the light reflected by the light reflector 18 and not reaching the original surface 13. It is a thing.

Incident light from above is displayed on the display unit 2 and the substrate 1 '.
And then enters the gap maintaining layer 12 from the light collecting portion 4. The light c of a certain component of the incident light from the light collecting portion 4 passes through the gap maintaining layer 12, is reflected by the document surface 13, enters the document reading light receiving element 5 ', and is read as an image of the document. .

The light c ', which is a component of the incident light including the position information of the handwriting input pen 14, is the gap maintaining layer 12.
The light is reflected by the light reflector 18 and is incident on the light receiving element 6'for handwriting input for photoelectric conversion, and the position of the handwriting input pen 14 is detected by image processing.

In this way, in the image input / output device of the second embodiment, the light reflector 18 for reflecting the incident light is formed below a part of the light receiving elements in the two-dimensional contact type light receiving element array. As a result, a part of the incident light can be used for reading for handwriting input, and the same two-dimensional contact type light receiving element array has two functions of original reading and handwriting input.

According to the image input / output device of the second embodiment,
Since the light reflector 18 is provided below the handwriting input array 6 which is a part of the two-dimensional contact type light-receiving element array, part of the incident light does not reach the document surface 13 and the light reflector 18 is not reached. It is reflected by and is incident on the handwriting input array 6 to read the handwritten input. Further, since the light reflector 18 is not provided below the document reading array 5, reflection on the document surface 13 is prevented. The light can be received by the light receiving element 5'for reading the original to read the image, and therefore, both the original reading and the handwriting input can be performed using the single two-dimensional contact type light receiving element array. Since the document reading device and the handwriting input device, which are separately formed, are integrated into one device, the image input / output device can be made smaller and lighter.

The second embodiment has a simple structure in which the reflector 18 is provided in the conventional two-dimensional contact type light receiving element array, and the function of handwriting input can be added, and the cost is reduced. There is an effect that can be.

Next, an image input / output device according to the third embodiment of the present invention will be described with reference to the enlarged sectional view of FIG. The image input / output device of the third embodiment has a structure similar to that of the second embodiment, and a light reflector 18 that reflects incident light to the lower part of the handwriting input array 6 of the two-dimensional contact type light receiving element array.
Is provided, and the light-receiving section 4 is formed inside the pattern of each light-receiving element of the array 5 for hand-writing input and the array 5 for hand-writing which forms a two-dimensional contact-type light-receiving element array. A feature is that a black matrix 20 is formed between the display array 5 and the handwriting input array 6 to shield light.

As shown in FIG. 4, in the image input / output apparatus of the third embodiment, the incident light c transmitted through the daylighting section 4a provided in the document reading array 5 is reflected by the document surface 13. Incident light c ′ that has entered the light receiving element 5 ′ for reading an original and has passed through the daylighting section 4 b provided in the array 6 for handwriting input is reflected by the light reflector 18 and is the light receiving element 6 for handwriting input. Incident on ′. Then, the black matrix 20 is formed between the original reading array 5 and the handwriting input array 6, and the light reflected by the original surface 13 is incident on the handwriting input light receiving element 6'or a light reflector. The light reflected by 18 is prevented from entering the document reading array 5 '.

As the material of the black matrix 20,
A resin or the like to which a black dye or a black pigment is added is used. Further, if the area of the lighting units 4a and 4b is too small, the amount of light decreases and the reading time becomes long.
The area of 4b is at least 5% or more of the area of the substrate 1 ', and more preferably 10% or more.

According to the image input / output device of the third embodiment,
Since the light collecting portions 4a and 4b are formed in the center of each light receiving element and the black matrix 20 is provided between the adjacent original reading array 5 and handwriting input array 6, the original reading light receiving element 5'is provided. The light incident from the light collecting portion 4a is reflected by the document surface 13 so as to be incident only on the document reading light receiving element 5 ', and the light incident from the light collecting portion 4b of the handwriting input light receiving element 6'is reflected by the light reflector 18. Then, the light is input only to the light receiving element 6'for handwriting input to prevent the light for reading the original and the light for handwriting input from entering the light receiving element array adjacent to each other, thereby lowering the detection accuracy of handwriting input. There is an effect that it is possible to prevent a reduction in reproducibility of document reading.

Further, when a document is read using outside light, there is unevenness in the illuminance of the outside light, and therefore density unevenness easily occurs in the read document. Here, in the image input / output devices of the second and third embodiments, the pitch between the handwriting input light receiving element and the original reading light receiving element is such that the light amounts of light incident on both light receiving elements are equal (both light receiving elements). If the light input element for handwriting input is operated in the same way as the light source for reading originals and the charges read by both light receiving elements are output, By correcting the output obtained by the original reading light receiving element with reference to the output obtained by the handwriting input light receiving element in the pixel, it is possible to eliminate the density unevenness in each original reading light receiving element. Specifically, since the ratio of the output of the light receiving element for handwriting input to the output of the light receiving element for reading the original corresponds to the reflectance of the original, the image information of the original is calculated based on the reflectance obtained at each pixel. By determining, it is possible to eliminate the uneven density of the original.

[0062]

According to the first aspect of the invention, a reflecting layer is provided between the reading unit and the document surface to reflect a part of the light incident from the back surface of the reading unit, and the incident light is reflected on the document surface. The first light receiving element group that receives the first light and reads the document and the second light receiving element group that receives the second light reflected by the reflective layer and reads the handwritten input image are provided in the reading unit. Since the image input / output device has the image input / output device, it is possible to perform both document reading and handwriting input by the reading section composed of a plurality of light receiving elements arranged in a two-dimensional array on a single substrate, and the image input / output device can be downsized The advantages are that the weight is reduced, the cost is reduced, and the structure and mounting method of the device can be simplified.

According to the second aspect of the invention, the first light used for reading the original is set to the first wavelength (λ1), and the second light used for reading the handwritten input image is set to the second wavelength (λ2). ) Is provided between the reading section and the document surface, and a first absorption filter for absorbing the light of the wavelength λ2 is provided so as to cover the first light receiving element group and to have the light reflection filter for reflecting the light of the wavelength λ2. The image input / output device according to claim 1, further comprising a second absorption filter for absorbing the light of wavelength λ1 so as to cover the second light receiving element group, so that the light of wavelength λ1 is transmitted through the light reflection filter. Then, the light is reflected by the document surface, received by the first light receiving element group, and the image of the document is read.
Light is reflected by the light reflection filter and received by the second light receiving element group to read the handwritten input image, and only the light of wavelength λ1 for reading the original is incident on the first light receiving element group. Since only the light of wavelength λ2 for handwriting input can be made incident on the second light receiving element group, high resolution reading can be performed without mixing the image of the original with the image of the handwriting input. effective.

According to the invention of claim 3, a reflective layer is provided between the second light receiving element group and the document surface so that the reflected light is incident on the second light receiving element group. Since the image input / output device is used as the image input / output device, the image input / output device that can be used for both document reading and handwriting input can be formed with a simple structure.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional explanatory view of an image input / output device according to an embodiment (first embodiment) of the present invention.

FIG. 2 is a characteristic explanatory diagram of each optical filter of the present embodiment.

FIG. 3 is an enlarged cross-sectional explanatory view of an image input / output device according to a second embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional explanatory view of an image input / output device according to a third embodiment of the present invention.

[Explanation of symbols]

1 ... reading unit, 2 ... display unit, 3 ... filter unit, 4
... Light collecting part, 5 ... Original reading array, 6 ... Handwriting input array, 7, 8 ... Light absorbing filter, 9 ... Light absorbing filter, 10 ... Light reflecting filter, 12 ... Gap maintaining layer, 13 ... Original surface, 14 ... Pen for handwriting input,
15 ... Light emitting part, 18 ... Light reflector, 20 ... Black matrix, a ... Light of wavelength λ1, b ... Light of wavelength λ2
c ... Incident light

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04N 1/04 Z 7251-5C

Claims (3)

[Claims] 1. An image input / output device comprising a reading section composed of light-receiving elements arranged two-dimensionally in a row direction and a column direction, and a display section composed of a flat panel display device. A first light receiving element group for reading an image on the document surface by receiving a first light reflected by the document surface and providing a reflection layer for reflecting a part of the light incident from the back side of the reading unit. An image input / output device, wherein the reading unit includes a second light receiving element group that receives the second light reflected by the reflective layer and reads a handwritten input image. 2. The first light is light of a first wavelength,
The second light is a light of a second wavelength, the reflection layer is a light reflection filter that reflects the light of the second wavelength, and the light reflection surface of the first light receiving element group is covered. A first absorption filter that absorbs the light of the second wavelength is formed, and a second absorption filter that absorbs the light of the first wavelength is formed so as to cover the light receiving surface of the second light receiving element group. The image input / output device according to claim 1, wherein the image input / output device is provided. 3. The image input / output device according to claim 1, wherein the reflective layer is provided between the second light receiving element group and the document surface.