JPH02274162A - Picture reader - Google Patents

Abstract

PURPOSE:To read a transparent original by providing a transparent original projecting means having one side transparent diffusion projecting face can be replaced and a means fixing an original read face perpendicularly to the reader. CONSTITUTION:A transparent original platen 2 of a scanner main body is designed to be replaced with a transparent original projection plate 3 (screen plate) having a transparent diffusion projection face (frosted glass or the like) on its one side and a means 8 (scanner stand) fixing the screen plate 3 of the scanner main body 1 to the scanner main body 1 to be perpendicular is prepared, and a picture projected with magnification with a slide projector 9 or the like on market is formed on the screen plate 3. Thus, the transparent original 3 is read by replacing the original platen 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of an image reading device used for image input.

[Prior Art] Conventionally, as an image reading device, a carriage 4 is shown in FIG. As shown in Figure 3(C), the reading range 1
6, and uses a pulse motor 13 as a driving source to move the carriage 4 along a guide shaft 12 via a pulley 14 and a belt 15 to perform sub-scanning, as shown in FIG. Transparent manuscript board 2 on the bottom
1. An image reading device has been devised that is installed in a scanner main body 1 incorporating a transparent original confirmation plate 17 on the upper surface and reads a reflective original by placing the scanner main body 1 above the original 11.

[Problems to be Solved by the Invention] The conventional image reading device as described above has a scanner body installed above a reflective document, uses a lamp in a carriage as a light source, reflects the light from the surface of the document, and transmits light through a lens in the carriage. Due to the structure of forming an image on an image sensor, it has been impossible to read a transparent original instead of a reflective original. Furthermore, when reading a transparent original using the image reading device, a method has been known in which the transparent original is placed on a white surface light source such as a light box and then read.

In this case, the size of the original to be scanned is read at the same size, so 35mm, which is considered to be particularly in demand for transparent originals,
With slide film, the document is small and must be enlarged using the image reading software, which has the problem of deteriorating image quality in terms of reading resolution.
A mechanism for enlarging and projecting a transparent original onto the image reading device has been desired.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the image reading device of the present invention has a transparent document plate of the scanner body that is removable and has a transmission type diffuse projection surface (ground glass) on one side instead of the document plate. etc)
means (hereinafter simply referred to as a scanner stand) for fixing the scanner body so that the screen plate of the scanner body is vertical; The present invention is characterized in that it is possible to read a transparent original by forming an image on the screen plate, which is prepared and enlarged and projected using a commercially available slide projector or the like.

Further, although the image 9 formed on the screen plate is a mirror image when viewed from the carriage side, the image output order of the read image in the main scanning direction can be reversed to obtain a regular image.

[Function] When the image reading device configured as described above reads a reflective original, the scanner body is installed above the original, and a lamp mounted on the carriage is used to perform the reading. When reading a transparent original, the original plate used for reading the reflective original is removed from the scanner body, the screen plate is attached in its place, and the scanner body is installed vertically using the scanner stand. . Then, using a commonly used slide projector or the like, the reflected original is projected onto the screen plate and read. As the transparent original is enlarged and projected as described above, the original is 35
Even when using a mm slide film, trimming can be performed freely at any magnification ratio, making it possible to prevent deterioration in image quality when enlarging by software operations after reading.

[Example] The fruits and examples of the present invention will be explained below based on the drawings.

In this embodiment, when reading a reflective original, the scanner body 1 is placed above the original as shown in FIG. 4, as in the conventional manner. When reading a transparent original, remove the original g4 plate 2 from the scanner body 1,
The screen plate 3 is attached as shown in FIG. 1(a). Furthermore, one side of the screen plate 3 has been subjected to a uniform permeable diffusion surface treatment, so that an image projected from the direction A is formed, and this image is also reflected by the lens 5 in the carriage 4 and the image. It is possible to read through the sensor 6. Further, the image forming surface 7 of the screen plate 3 which has been subjected to the transparent diffusion surface treatment is connected to the image sensor 6 and the lens 5.
coincides with the focal plane of the optical system consisting of Then, as shown in FIG. 1 (b"l), the scanner body 1 with the screen plate 3 mounted thereon as described above is fixed vertically using the scanner stand 8. Next, the screen plate 3 is fixed using a commercially available slide projector 9. to form an image to be read,
This causes the scanner body 1 to start reading. Note that in this case, the lamp 10 in the carriage 4 is turned off. In addition, in the above state, an image in the same direction as the original as shown in FIG. 2(a) is projected on the slide projector 9 side of the imaging plane 7, but this image is projected on the carriage 4 (!
! 1 is a mirror image shown in FIG. 2(b), and cannot be read as is. Therefore, main scanning inversion processing is performed, but in FIG. 2(C), a1 to a592 indicate the reading pixels in the main scanning direction (in the case of 592 pixels in the front main scanning direction), al, bl, C1 ,...
* indicates a pixel read in the sub-scanning direction due to movement of the carriage 4. Normally, the reading pixels are al, C2, ・
..., a592, bl, b2, ... b592, C1
The pixel information sent from the image sensor 6 around I of , C2, . However, in the case of a transparent original obtained by the above method, the main scanning direction - columns (al~
a592) is stored in the memory once, and the second
As shown in figure (d), the image processing circuit includes a592 and a591:
,... Send in the order of C2 and al. Similarly b592
, b591.・ b2, bl, c592, c591, ・
By performing the processing C2, C1, . . . , an image in the same direction as the original is obtained as shown in FIG. 2(a).

Note that this example is only one form of the embodiment, and if the readout start pixel of the image sensor 6 can be selected from left or right, the above-mentioned method may be used by reading from the opposite direction to the normal readout direction or after image processing. Exactly the same effect can be obtained by inverting the main scanning pixel array.

Furthermore, although this embodiment describes an image reading device with a moving reading head having a transparent structure that allows the surface of the document to be viewed directly, the present invention is applicable to all types of image reading devices in which the document is fixed.

[Effects of the Invention] As described above, according to the present invention, in a fixed document type image reading device, it is possible to easily read not only reflective documents but also transparent documents by simply replacing the document plate. Furthermore, since the image is enlarged and projected using a general slide projector, trimming can be easily specified at any magnification, and even small 35 mm slide films can be read with clear image quality.

[Brief explanation of drawings]

FIG. 1(a) is a cross-sectional view of a carriage in the sub-scanning direction in an embodiment of the present invention, FIG. 1(b) is a conceptual diagram of the image reading device, and FIG. 2(a) is a transparent original and screen of the embodiment. Conceptual diagram of the image projected on the board (viewed from the slide projector side), (b) is a conceptual diagram of the image projected on the screen board (viewed from the carriage side), and (C) is a conceptual diagram of the normal image sensor readout pixel arrangement. An explanatory diagram, (d) is an explanatory diagram of a pixel array that has undergone inversion processing on the main scanning side, and Fig. 3 (a)
) is a sectional view in the sub-scanning direction of a carriage in another conventional image reading device, (b) is a sectional view in the main scanning direction, and (C) is a conceptual diagram of the conventional image reading device. Further, FIG. 4 is an explanatory diagram of the conventional image reading device. 9...Slide projector 0...Lamp...Document 2...Guide shaft 3...Motor 4...Pulley 5. ...Belt 6...Reading range 7...Document confirmation plate and above 1...Scanner body 2...Document plate 3...・Screen plate 4... Carriage 5... Lens 6... Image sensor 7... Imaging surface 8... Scanner stand Applicant, Seiko Epson Co., Ltd. agent Patent attorney Kisanbe Meiki and 1 other person 1 varnish\dapne book Figure 3 (Q) (b) (C) (d) Figure 2

Claims (2)

[Claims] (1) A self-scanning photoelectric converter in which multiple-bit reading elements are arranged in series in the main scanning direction is mounted on a carriage, and the carriage is moved in the sub-scanning direction of the original within the reading device to perform reading. A document fixed type image reading device for performing image reading includes: a document holding device that is transparent and removable from the main body of the reading device; a transparent document projection device having a single-sided transmission type diffusion projection surface that can be attached interchangeably with the document holding device; and the image reading device. An image reading device comprising means for vertically fixing a document reading surface of the device. (2) The image reading device according to claim 1, wherein the output order of the image signals in the main scanning direction of the carriage can be reversed.