JPH05122446A - Scanner - Google Patents

Abstract

PURPOSE:To facilitate the switching between transmission original read and reflection original read. CONSTITUTION:The reflection original set on a platen glass 2 is illuminated by illuminators 1a and 1b capable of illuminating all of the periphery, and the light reflected on the original is led to a lens 5 by a mirror 4, and its image is formed on an image sensor 6 to read the original image; and at the time of reading the transmission original, a transmission original 3b interposed between a diffusing plate 7 which can be taken in and out and a holder glass is inserted to a main body and is illuminated by an illuminator 1c capable of illuminating all of the periphery, and obtained transmitted light is led to the lens 5, whose focus is moved to the transmission original, and the image sensor 6 by the mirror 4 to read the original image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanner using an image sensor or the like, and more particularly to a conversion method for reading a reflective original and reading a transparent original.

[0002]

2. Description of the Related Art Conventionally, in a scanner using an image sensor, the following method has been studied as a conversion means for reading both a reflective original and a transparent original.

FIG. 3 shows the configuration of parts when a reflective original is read in a conventional apparatus. The reflective original illuminating device 1a illuminates the reflective original 3a on the original platen glass 2 and the light reflected from the original surface is mirrored by a mirror 4 to a lens. 5, the image is formed on the image sensor 6, and the original is read.

At the time of reading a transparent original, as shown in FIG. 4, a transparent original 3b is placed on the original platen glass 2, a diffusion plate 7 is placed on the original, and the transparent original 3b is placed by the transparent original illuminating device 1b. Illuminate the light, guide the transmitted light to the lens 5 by the mirror 4, form an image on the image sensor 6, and read the original.

[0005]

Conventionally, in order to read a transparent original, an illuminating device for illuminating the transparent original is required outside the reflective original reader, and the transparent original must be attached and replaced as a separate unit. It was

Further, it is necessary to synchronize the operations of the main body device and the transparent original reading device, and since a mechanism for connecting both devices and for synchronizing them is installed in both the main body device and the transparent original reading device, the mechanism becomes complicated. Due to the nature of connecting both devices, the mechanism was exposed outside the device, which was a safety issue.

Further, both the main body device and the transparent original reading device are equipped with the same parts in their respective parts, which is expensive, large in size, and heavy in weight.

In order to solve the above problems, according to the present invention, the main body internal lighting device used at the time of reading a reflection original is
It is also used when reading transparent originals, and the purpose is to eliminate the external attachment device for transparent originals.

[0009]

A scanner according to the present invention comprises a platen glass, an illuminating device, a lens, an image sensor, and a diffusing plate, and illuminates a reflection document on the platen glass when reading a reflection document. The reflected light is imaged on the image sensor by the lens.

When reading a transparent original, the external light from the original glass is blocked, and the light is diffused in the optical path between the original glass and the lens and within the irradiation range of the illumination device used for illuminating the reflected original. It is characterized in that a transparent document image is formed on an image sensor by setting a plate and a transparent document and adjusting the focal point of the lens to the transparent document surface.

[0011]

According to the present invention, the reflection original is read by placing the diffusion plate and the transmission original between the original glass and the lens and within the irradiation range of the illumination device used for illuminating the reflection original. Since the internal mechanical parts used for can also be used for transparent reading, the number of parts can be reduced, and it is cheap, small, lightweight, and easy to switch between transparent and reflective.
A scanner that can read both sides can be realized.

[0012]

FIG. 1 is a cross-sectional view of a scanner according to the present invention in the sub-scanning direction when reading a reflective original. A reflective device installed on a platen glass 2 by an illuminating device 1c capable of illuminating the entire circumference. The original 3a is illuminated, and the reflected light of the original is mirrored.
The image of the original is read by being guided to the lens 5 and focused on the image sensor 6 by.

FIG. 2 is a sectional view of the scanner according to the present invention in the sub-scanning direction at the time of reading a transparent original. The original holder 9 is closed to shield the leaked light from the original table glass, and a diffusing plate 7 which can be taken in and out. Illumination device 1 capable of illuminating the entire circumference of transparent original 3b sandwiched by holder glass 10.
By illuminating with c and moving the sensor and lens moving block 8, the transmitted light is guided by the mirror 4 to the lens 5 and the image sensor 6 whose focus has moved to the transparent original surface, and the original image is read.

[0014]

According to the present invention, when a transparent original is read, the transparent original is installed inside the reflective original reader, so that there is no external device, the number of parts is reduced, the cost is small, the weight is light, and the main body is There is no need to consider tuning between different devices, which simplifies the structure and mechanism,
It is easy to switch the method of reading the reflective original.

[Brief description of drawings]

FIG. 1 is an explanatory view when reading a reflective original according to the present invention.

FIG. 2 is an explanatory view when reading a transparent original according to the present invention.

FIG. 3 is an explanatory view when reading a reflective original according to the related art.

FIG. 4 is an explanatory view when reading a transparent original according to a conventional technique.

[Explanation of symbols]

 1a Illumination device for reflective originals 1b Illumination device for transparent originals 1c Illumination device for both reflection and transmission 2 Platen glass 3a Reflective originals 3b Transparent originals 4 Miller 5 Lens 6 Image sensor 7 Diffuser 8 Sensor, lens moving block 9 Original holder 10 Transparent original holder glass

Claims (1)

[Claims] 1. A scanner comprising an illuminating device, a lens, and an image sensor, wherein the illuminating device illuminates the surface of the original of the reflective original so that the light reflected from the original is imaged on the image sensor by the lens. By placing the diffuser plate and the transparent original in the optical path between the base glass and the lens and within the irradiation range of the illumination device used for illuminating the reflective original, and aligning the lens focus position with the transparent original surface, A scanner characterized in that a document image is formed on an image sensor.