JPH0440745A - image reading device - Google Patents

Abstract

PURPOSE:To confirm the film set state without increasing the cost and at the same time to improve the operability of an image reader by illuminating an original set on the reader main body by means of a 2nd illumination means. CONSTITUTION:The same illumination light source is used when a film original is set and when the original is actually read, and a partial luminous flux is led to a dispersion plate 27 by a mirror 26. Then a film image illuminated at its back is confirmed through an aperture 33 corresponding to the plate 27. A carrier 16a or 16b is set to a scanner 31 when this scanner is positioned above the plate 27 as shown in the diagram. Then the original is actually read when the end part of the original reading area moves up to a position corresponding to an optical axis l1 and then the original is scanned at a speed corresponding to the original reading speed.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Application Field The present invention relates to an image reading device that electrically reads an image of a transparent original such as a film using a photoelectric conversion element such as a COD.

<Prior Art> Conventionally, this type of image reading device has the configuration shown in FIG. 6.

In the figure, a film F as a transparent original is illuminated from a light source 1 through an illumination optical system 2 consisting of a condensing lens, etc., and the transmitted light, which is an original image, is transmitted through a projection lens 3 to a C.
The projected image of the document image is projected onto a sensor 4 such as a CD, and the cough sensor 4 converts the projected image of the original image into an electrical signal, and the image is read.

<Problems to be Solved by the Invention> However, with the configuration of the conventional example described above, there is a problem in that the film F cannot be confirmed while it is set in the device, so the vertical, horizontal, vertical, etc. of the image cannot be determined until it is read. Ta. In other words, when setting the film F in the device, it is necessary to set the film F in the correct direction.
It was extremely difficult to operate. Furthermore, in order to solve this problem, an optical system is provided separately from the optical system that projects the film F onto the sensor 4, the optical path is switched, and the film image is projected onto the screen, thereby confirming the set film. A device configured to do this has also been proposed, but this requires two systems of projection optical systems, resulting in an increase in cost.

SUMMARY OF THE INVENTION In view of the problems of the prior art described above, it is an object of the present invention to provide an image reading device that is capable of checking the state of a film set without increasing costs and has good operability.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention includes an illumination optical system that illuminates a document, and a light image from the document illuminated by the illumination optical system that is guided to a photoelectric conversion element. a projection optical system for transmitting the image information of the document;
and a second state for performing a reading operation of the original, and the scanning means is provided with another illumination means for illuminating the original in the first state.

Preferably, the separate illumination means is composed of a reflection member that reflects the illumination light from the illumination optical system and a diffusion member that diffuses the illumination light.

<Function> In the image reading device having the above configuration, when a document is set, the document is illuminated by another illumination means, and the condition of the document,
For example, it is possible to easily check the vertical and horizontal, right and left, top and bottom, etc. before reading, and mistakes in document setting can be prevented in advance.

Further, by forming the second illumination means from a reflection member and a diffusion member, the image of the document becomes easier to see.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 5.

First, FIG. 1 is a perspective view showing a schematic configuration of an image reading position. In the figure, 11 is the apparatus main body, 12 is an illumination optical system consisting of an illumination lamp, a condensing lens, a field lens, etc., and 13a, 13b.

A reflecting mirror 14 disposed along the projection optical path is a projection lens 13c, which is disposed between the reflecting mirrors 13b and 130, and which transmits a film original (not shown) illuminated by the illumination optical system 12. Mirrors 13a to 13 that reflect light images
It is projected onto the sensor 15 via c. The type sensor 15 is a line sensor such as a CCD, and as the film original is scanned by a scanning system to be described later, the image information of the film original is sequentially converted into electrical signals. 16a and 16b are carriers that hold film originals, which are set in a scanning system to be described later, and can be set in both 16a (horizontal position) and 16b (11th position!) depending on the length and width of the film original. .

FIG. 2 shows this image reading VR1+7) illumination optical system 12. A perspective view of a scanning system and a drive system is shown. In the same figure,
Reference numeral 21 denotes a pair of rails fixed to the apparatus main body 11 (not shown), on which a scanning body 31 (described later) reciprocates. 2
2 is a driven pulley; 23 is a driving pulley; 24 is a motor for driving the driving pulley; 25 is a wire that is hung between the driven pulley 22 and the driving pulley 23 and is fixed to the scanning body 31; Therefore, the motor 24 is connected to the drive pulley 23. The scanning body 31 is moved via the driven pulley 22 and the wire 25.

Reference numeral 26 denotes a reflection mirror 27 fixed to the apparatus main body 11, which is a diffuser plate also fixed to the apparatus main body 11, and the illumination optical system 12.
The light flux from the mirror 26 is incident on the reflective mirror 26. 28
is a display frame printed on the diffusion plate 7 and having a predetermined shape.

Further, the illumination optical system 12. The optical axis 11 of the reading system passes through the projection lens 14 (not shown) and the optical axis j! passes through the center of the diffuser plate 27! 2 is vi, the optical axis f of the left reading optical system with respect to the main body 11! Although a film original (not shown) is scanned and read on the film original 1, a reflection mirror 13a is located above the film original, and the film original illuminated by the illumination optical system 12 cannot be directly seen.

On the other hand, by setting the film original on the diffuser plate 27 that is spaced apart from the optical axis 11 of the reading optical system, it becomes possible to check the film image illuminated from behind by the diffuser plate 27 at the set position. ing.

FIG. 4 is a perspective view of the main parts of the scanning system.

In the figure, the scanning body 31 has an upper support portion 31a.

It is constituted by a base 31b, and is slidably supported by the rail 21 by a bearing 32 provided integrally with the base 31b. The upper support part 31a and the base 31b
has an aperture 3 corresponding to the diffuser plate 27 (not shown).
3 is provided for viewing the backlit film image through the aperture 33. Furthermore, openings 34 and 35 are provided corresponding to the setting directions of the carrier 16a in the horizontal position and the carrier 16b in the vertical position, respectively, and a film original is set by inserting the carrier 16a or 16b in the direction of the white arrow in the figure. .

With the above configuration, the carrier 16a or 16b is set in the illustrated state in which the scanning body 31 is located above the diffuser plate 27, but in actual reading operation, the end of the reading area of the film original corresponds to the optical axis 11. The reading operation is performed by moving to a position where the object is to be read, and scanning from that state at a speed corresponding to the reading speed. After scanning the entire reading area, the scanning body 31 returns to the position shown, and the reading operation ends.

FIG. 5 is a perspective view of a filter section that selects either a cyan filter or an ND filter depending on whether the film original is a negative film or a positive film.

In the figure, reference numeral 41 denotes a switching plate rotatably supported by a shaft 41a, which is arranged between the scanning body 31 and the illumination optical system 12, and is an ND filter that is selected depending on whether the film original is a positive film or a negative film. 42. cyan filter 4
3 are integrally provided. The switching plate 41 is a spring 44
The stopper 4 is normally biased counterclockwise as shown in the figure.
An ND filter 42 is placed in the optical path in contact with the switching plate 41 . One side of the cyan filter 43 contacts the stopper 46, and the cyan filter 43 is positioned in the optical path.

As shown in the figure, the filter portion is only the portion corresponding to the sensor 15, and the rest is shielded from light to prevent the occurrence of flare ghosts.

In this embodiment, the illumination light source when the film document is set is the same as the illumination light source used during actual reading.
Although a part of the light beam is guided to the diffuser plate 27 by the mirror 26, the same function can be obtained even if a dedicated illumination light source is provided below the diffuser plate 27 as an illumination light source when the film document is set. Needless to say, you can get it.

Furthermore, with such a configuration, only the necessary illumination light sources can be turned on when setting a film document and during a reading operation.

<Effects of the Invention> As explained above, the present invention makes it possible to check the condition and direction of the document by illuminating the document with the second illumination means while the document is set in the main body of the apparatus. This has the effect of significantly improving the operability when setting originals.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an image reading device according to an embodiment of the present invention, FIG. 2 is a perspective view of main parts of the illumination optical system, scanning system, and drive system, and FIG. 3 is a front view showing the configuration of the device. FIG. 4 is a perspective view showing the configuration of the scanning system, FIG. 5 is a perspective view showing the configuration of the filter system, and FIG. 6 is a schematic configuration diagram of a conventional image reading apparatus. 11... Apparatus body, 12... Illumination optical system, 13a. 13b, 13G... Reflection mirror 14... Projection lens, 15... Line sensor, 16a, 16b... Carrier, 26... Reflection mirror 27... Diffusion plate, 3
1...Scanning object. Figure Figure L

Claims (1)

[Scope of Claims] 1. An illumination optical system that illuminates an original, and a projection optical system that guides an optical image from the original illuminated by the illumination optical system to a photoelectric conversion element, and converts image information of the original into an electrical signal. The image reading device has a scanning means for sequentially scanning the original, and the scanning means has a first state in which the original is set and a second state in which the original is read.
1. An image reading apparatus characterized in that the scanning means is provided with another illumination means for illuminating the document when the scanning means is in the first state. 2. The image reading device according to claim 1, wherein the other illumination means comprises a reflection member that reflects the illumination light from the illumination optical system and a diffusion member that diffuses the illumination light.