JPH0339430B2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention scatters illumination light with a light scattering plate, and the scattered light passes through the transmission type document to be read and enters the reading element. The present invention relates to a transmissive document reading device that reads the contents.

In particular, the present invention relates to a reading device that performs a reading operation by placing a transparent original such as a film on a flat original table like a general electronic copying machine.

<Prior Art> A reading device as shown in FIG. 6 has been proposed in which a document such as a photographic film is placed on a flat document table and the reading operation is performed.

To explain the conventional device shown in FIG. 6, light from the lighting lamp 4 as a light source is transmitted to the cover 4A.
The light scattered by the light scattering plate 5 provided on the surface facing the original 6 illuminates the transmission type original 6 from above, and the light transmitted through the reading point A is transmitted to the illumination lamp 4 and the original 6. An image of the point A is formed on the element surface of the reading element 3 via the reflecting mirror 1 and the reading lens 2, which are placed on opposite sides of the image, and reading of this point A is performed.

The illumination light 4 is illuminated onto the document 6 side by a cover 4A, and the document 6 is sequentially moved in the direction of arrow B on a document table 7 made of transparent glass, for example, so that the document 6 at point A is illuminated. The entire document 6 is read by the reading element 3 sequentially reading the contents.

In this case, photographic film is often used as the transmission original, but photographic film is prone to warping due to changes in temperature and humidity. Further, due to the structure of the transmissive type document reading device, it is not possible to correct the warpage by pressing the document with a normal document pressing plate as in the case of a reflective type document reading device.

Therefore, it was necessary to tape the warped original to the original table, or to press the original with a transparent glass plate.

However, with this method, it is too time-consuming to attach with tape, and if it is pressed with a transparent glass plate, the amount of light decreases when the scattered light passes through the glass, so it is necessary to increase the amount of light. There were other problems. Therefore, conventional document holders for transparent type documents have had various problems.

<Objective> The object of the present invention is to provide the above-mentioned transmissive type document reading device equipped with a document holder that does not reduce the amount of light from the light source as a means to prevent the transmissive type document from warping, etc. The purpose is to provide an improved device that

In particular, by using a light scattering plate as the transmissive original holder and making the light scattering plate also serve as the original holder, a special original holding member is not required, thereby simplifying the configuration and reducing costs. It is something.

<Embodiment> An embodiment of the present invention is shown in Figs. 1 and 2, in which Fig. 1 shows the configuration of the entire apparatus, and Fig. 2 shows a planar view of the surface on which the original to be read is placed. It is.

In the apparatus configuration shown in FIG. 1, light from an illumination lamp 4 serving as a light source is scattered by a light scattering plate 5 serving as a document holding member, and is positioned between a document table 7 made of transparent glass or the like and the light scattering plate 5. transparent type original 6
The light transmitted through the reading point A passes through the illumination lamp 4 and the reflection mirror 1 placed on the opposite side of the original 6, and the reading lens 2, and then reaches the element surface of the reading element (for example, CCD) 3. An image of the point A is formed at , and this point A is read.
Then, the light scattering plate 5, the original 6, and the original table 7 are moved in the direction of arrow B, and as a result of this movement, the original 6
The whole is read by the reading element 3. Note that 4A is a cover for the illumination lamp 4.

As mentioned above, at a predetermined position on the side of the document table 7 facing the illumination light 4, there is a cutout portion 8A approximately equal to the size of the transmission type original 6, and approximately equal to the thickness of the transmission type original 6. A thick film 8 of a predetermined size is placed (see FIG. 2), and the original 6 is placed within the cutout 8A of the film 8.
A light scattering plate 5 is placed directly on the film 8 and the original 6, and the light scattering plate 5 presses the transmission type original 6 onto the original table 7. The light scattering 5 is provided to have approximately the same size as the film 8.

Said film 8 is clearly visible in FIG.
It is configured to be opaque, especially in the visible light range, to prevent unnecessary external light from entering the device. However, only a portion 8B corresponding to the length of the cutout 8A is transparently provided at a position along one side of the cutout 8A of the film 8 in the document feeding direction to allow light to pass through. Used to detect end timing.

That is, the document table 7 is located above the reading point A of the document 6 and corresponds to the transparent portion 8B of the film 8.
A phototransistor 9 is disposed at a lower position, and when the transparent portion 8B moves to the reading point A during reading of the original 6, scattered light passes through the film 8 and enters the phototransistor 9. The reading start timing is set at the rising edge of the output. The relationship between the output Vp of the phototransistor 9 and the read timing signal _TM is shown in the time chart of FIG.

Similarly, the transparent portion 8B is the reading point A.
The reading is completed when the output of the phototransistor 9 completely passes through and the output of the phototransistor 9 falls.

A plurality of the above-mentioned films 8 are prepared according to the size of the transmission original 6, and the film 8 corresponding to the size of the original 6 is selected and placed on the original table 7.

Next, another embodiment is shown in FIG. 4, in which the above-described film 8 having a cutout portion 8A corresponding to the transmission type original 6 is attached to the light scattering plate 5 side.

That is, the above-mentioned film 8 is attached to the light scattering plate 5, and a transparent film cover 10 with one end attached to the light scattering plate 5 is mounted on the film 8.

Therefore, the original 6 is placed in the cutout 8A of the film 8, and then the cover 10 is used to close the film 8.
After the top is covered, the film 8 is placed on the document table 7 at a predetermined position on the document table 7, and a reading operation is performed. As a result, the original 6 is pressed toward the original table 7 by the light scattering plate 5,
The light scattering plate 5 acts as a presser to prevent the original 6 from warping.
is prevented.

FIG. 5 shows a configuration in which the original platen feeding shown in FIG. These rollers 11, 11 move the light scattering plate 5, original 6, film 8, and original table 7 in the direction of arrow B, and return them in the opposite direction of arrow B after reading.

In each of the above-mentioned embodiments, the illumination was monochromatic light, but by installing multiple color illumination lights and repeating their sequential flashing, or by placing a filter in front of the illumination light and switching the filter, color transmission can be achieved. It is clear that it is also possible to use a type document reading device.

<Effects> As described above, in the present invention, by using the light scattering plate as a transmissive document holder, it is possible to create a transmissive document reading device that does not require the trouble of pasting tape or reduce the amount of light due to the presser glass as in the past. becomes. Furthermore, by using the light scattering plate as the document holding member, the structure is simple and can be implemented at low cost. Furthermore, the film with the cutout allows the transmissive original to be always placed in a predetermined position, and by making the film opaque, it is possible to prevent unnecessary light from entering the device. Furthermore, by making a part of the film transparent, the timing of reading start and end can be accurately obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of the apparatus of the present invention, FIG. 2 is a plan view of the document placement section shown in FIG. 1, FIG. 3 is a time chart of the reading timing, and FIG. FIG. 5 is a diagram showing an embodiment, FIG. 5 is a diagram showing a feeding configuration of a document table, and FIG. 6 is a diagram showing a configuration of a conventional apparatus. 1: Reflection mirror, 2: Reading lens, 3: Reading element, 4: Illumination light, 5: Light scattering plate, 6: Transmissive original, 7: Original table, 8: Film, 8A: Film cutout, 8B: Light transmitting part of film, 9:
Phototransistor.

Claims (1)

[Scope of Claims] 1. Light from a light source is scattered by a light scattering plate, the scattered light is irradiated onto a transmissive original such as a film to be read, and the light transmitted through the original is guided to a reading element. A transmissive type document reading device for reading the document using the element, characterized in that a holding member made of a light scattering plate is provided to press a transparent document placed on a transparent document table against the document table. Manuscript reading device. 2. The transmissive original is surrounded by a film having a cutout portion approximately equal to the size of the original and a thickness approximately equal to the thickness of the original; 2. The transmission type document reading device according to claim 1, wherein the device is interposed between a pressing member.