JPH02174462A - Picture reader - Google Patents

Abstract

PURPOSE:To improve the positioning accuracy and the operability by fixing a read optical system in the film read mode and moving a film so as to apply scanning. CONSTITUTION:When the film picture read mode is selected, a read unit 3 moves from a position A till a prescribed position B and then stops. Then a lamp 16 of a film projector 13 is lighted and a projected image of a film F is formed on an original face. Read scanning is applied by reciprocating the film F while fixing the read unit 8. The film F is sequentially scanned by being moved at an equal speed upward by a film feed mechanism and a time series photoelectric conversion picture element signal S of read picture information from a solid-state image pickup element array 4 is outputted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a mode in which a film projector projects a film image onto an original platen, reads and copies the projected image, and a mode in which the projected image is read or copied, and The present invention relates to an image reading device that can select a mode for reading, copying, etc. a placed original.

[Conventional technology]

The device itself as described above is already known. An example is shown in FIGS. 4 and 5. The device of this example has two modes: a mode in which a normal sheet original, book original, etc. is placed on the document table and its image information is read and copied, and a film projector is used to project and form a film image on the document table. You can select a mode for reading, copying, etc. the projected image. FIG. 4 shows the former reflection original image processing mode, and FIG. 5 shows the latter projection image processing mode.

In the figure, 1 is an exterior cylinder of the main body of the apparatus, 2 is a transparent plate as a document table fitted into a window hole formed on the upper surface of the exterior tube, and 3 is a movable plate provided on the bottom side of the document table 2. This is an image reading unit.

The image reading unit 3 includes a solid-state imaging device array 4 (contact line sensor) such as a CCD array, a short focus imaging device array 5 (product name 5elfoc), an infrared cut filter 6,
It consists of an illumination lamp 7, etc., and is guided by a guide rail by a drive mechanism (not shown) to move the document table 2 along the lower surface of the document table 2.
It is moved from the home position (solid line water position) on the left side to the right side at a predetermined speed V, and when it reaches a predetermined end point of the forward movement, it is returned to the home position again.

A0 reflection original image processing mode (FIG. 4) An original O such as a sheet original or a book original is placed at a predetermined position on the upper surface of the original table 2 with the image surface facing downward, and the original holding plate 8 is placed over it. Set the mode selection switch on the device to the corresponding mode and press the processing start button.

Then, the illumination lamp 7 of the image reading unit 3 is turned on, and the forward movement a of the unit 3 is performed.

As a result, the downward image surface of the set document 0 on the document table 2 is sequentially illuminated and read and scanned from the left side to the right side.
A time-series charging conversion pixel signal S of read image information is output from the solid-state image sensor array 4. The output signal S is input to a printing mechanism (not shown) such as a laser beam printer built in the apparatus or as a separate device, and a half copy of the image corresponding to the image information of the original O is printed out.

In the case of a facsimile device, the signal S is transmitted to the receiving device by wire or wirelessly. In the case of Image League, the signal S is stored in a storage section or reproduced and displayed on a display device such as a CRT.

B. Projection image processing mode (Fig. 5) A Fresnel lens 11 is placed on the document table 2. Alternatively, the diffuser plate 10 and Fresnel lens 11 are placed. The member 11 or lO・1
A film projector 13 projects and forms a film image onto a document table 2 on which a document 1 is placed. In this example, the film projector 13 is removably set on the top plate of the outer cylinder of the apparatus main body on the right side of the document table 2, and is positioned in front of the projector 13 above the document table 2 at an angle of approximately 45 degrees downward. A film image is projected and formed onto a document table 2 via a mirror 12 that is stably supported and set.

The Fresnel lens 11 serves to convert the imaging light into a parallel beam of light. Set the mode selection switch to the corresponding mode and press the process start button.

Then, the forward movement a of the image reading unit 3 is performed (in this case, the illumination lamp 7 is kept in the off state),
The film projection image on the document table is sequentially read and scanned from the left side to the right side, and a time-series photoelectric conversion pixel signal S of the read image information from the solid-state image sensor array 4 is output.

The solid-state image sensor array 4 is not only for reading black and white images, but also has three-color resolution (red R, green G, blue B) and can read color or multicolor images. The color reading device can also be used for black and white image reading.

[Problems to be Solved by the Invention] However, in the above conventional example, the entire surface of the film is enlarged and projected onto the document table, and the projected image is scanned and read by the image reading unit, which has the disadvantage of increasing the size of the device. was there. In other words, in order to enlarge and project the entire surface of the film, a large lens with a wide image size and a long focal length is required.

Also, large lighting units for illuminating a wide area,
Alternatively, a large mirror is required to fold back a wide beam of light.

In addition, depending on the switching between reflective original reading mode and film image reading mode, a large diffuser plate and Fresnel lens,
Alternatively, a folding mirror or the like must be attached and detached, which poses problems in positioning accuracy and operability.

[Means for solving problems]

In order to solve the above problems, the present invention has a mode in which a document placed on a document table is read by scanning an optical system, and a film projector projects and forms a film image on the surface of the document. In an image reading device capable of selecting a mode in which a projected image is read by the reading optical system, in the film reading mode, the film is kept stationary with respect to the scanning direction of the reading optical system, and reading scanning is performed by moving the film. This is how it was done.

[Embodiment 1] FIG. 1 shows a first embodiment of the present invention. Components common to those shown in FIGS. 4 and 5 described above are given the same reference numerals, and repeated explanations will be omitted.

In the film projector 13, 16 is a light source lamp;
1 is a condenser lens and a heat ray absorption filter group, F is a set film, and 17 is an imaging lens. In the above configuration, the reflection original reading mode is the same as the conventional example, but when the film image reading mode is selected, the reading unit 3 moves from A to a predetermined position B as shown in FIG. Move and stop. After that, film projector 1
The lamp 16 of No. 3 is turned on, and the projected image of the film F is formed on the surface of the document.

The reading scan is performed by moving the film F forward C while keeping the reading unit 3 fixed. 1st
In the case of the figure, the film F is sequentially scanned by moving upward at a constant speed by a film feeding mechanism (not shown), and a time-series photoelectric conversion pixel signal S of image information read from the solid-state image sensor array 4 is output. . The pixel signal S is subjected to image processing using a known technique and then input to a printer or the like to obtain a hard copy.

[Embodiment 2] FIG. 2 shows a second embodiment of the present invention. In FIG. 2, the image reading unit 3 includes a solid-state imaging device array 4 such as a one-dimensional CCD array with pixels arranged in the X direction, a short focus imaging device array 5, an infrared cut filter 6,
Consists of illumination lamps 7, etc., in the X direction (main scanning direction) and Y direction (sub scanning direction...perpendicular to the paper surface) shown in FIG.
It is possible to move to

When the reflective document reading mode is selected, the image reading unit 3 moves to the home position on the left side of the document table 2, and
Further, scanning is performed in the sub-scanning direction Y, and only the inside b' of the document is read and scanned. Next, the image reading unit 3 is intermittently moved by b' in the X direction, and further scanned in the sub-scan Y direction. This operation is repeated sequentially (the entire document is read).

On the other hand, when the film image reading mode is selected, the image reading unit 3 moves to the home position on the left side of the document table 2 and stops. Thereafter, the lamp of the film projector 13 is turned on, and a film projection image is formed on the document surface. Here, the film projected image has a width a in the main scanning direction of the film F, as shown in FIG.

Only a region widthwise in the sub-scanning direction is projected onto the document surface in the form of a slit. The image reading unit 3 scans in the sub-scanning Y direction while being fixed in the main-scanning X direction, and reads the film projection image. Next, the film is advanced by a distance a in the direction C in FIG. 3, and a slit-shaped image is projected onto the same position on the document surface. An image reading unit scans this projected image in the Y direction to read the film image. Film F
By sequentially and intermittently moving the film F at a pitch a, the entire area of the film F can be read. In this way, since the film is sequentially projected and read in a slit shape, the film F
It is only necessary to illuminate the slit part (area aXb in Figure 3) (the illumination system can be made more compact compared to illuminating the entire surface of the film).Also, since the film F is projected in the form of a slit, the folding mirror The width of the device is also narrow (the entire device can be made compact).

[Embodiment 3] FIG. 6 shows a third embodiment of the present invention. Said 1st. In the second embodiment, the film projector 13
The folding mirror 12 and the folding mirror 12 are attached to the main body l of the image reading device, but as mentioned above, in the film reading mode, the film projector 13 and the folding mirror 12 can be made compact because scanning is performed by moving the film. , it is possible to incorporate it into the pressure bonding plate 8 for holding down the document in the document reading mode. That is, as shown in FIG. 6, a projection lens 17, a light source lamp 16, a condenser lens 15,
Reflection mirror 12, Fresnel lens 11. Diffusion plate 10
By incorporating a built-in camera, there is no need to attach or detach a folding mirror, Fresnel lens, diffuser plate, etc. when switching between reflective original reading mode and film image reading mode, which improves positioning accuracy and operability by attaching and detaching, which was a problem in the past. It is possible to significantly improve the

〔Effect of the invention〕

As explained above, according to the present invention, in an image reading device that can select between an original reading mode and a film reading mode, in the film reading mode, scanning is performed by fixing the reading optical system and moving the film. Therefore, compared to conventional devices that project and read the entire film at once, the optical system including the projection lens and mirror can be made more compact, and only a slit-shaped area needs to be illuminated.
This also has the effect of making the lighting system more compact. In addition, by incorporating the optical system such as a projection lens and mirror, and the illumination system within the document holding pressure plate, it is even more compact.
It is possible to significantly improve positioning accuracy and operability by attaching and detaching in response to mode switching, which was a problem in the past.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a first embodiment of the present invention, Fig. 2 is a schematic diagram showing a second embodiment of the invention, Fig. 3 is an enlarged view of the film feeding portion of Fig. 2; 4 and 5 are schematic diagrams showing a conventional example, and FIG. 6 is a schematic diagram showing a third embodiment of the present invention. Original table glass Image reading unit Solid-state image sensor array Short focus imaging element array Illumination lamp Document holder Pressure bonding plate Diffuser plate Fresnel lens Folding mirror film Projector Condenser lens Light source lamp Projection lens film

Claims (4)

[Claims] (1) A mode in which a document placed on a document table is scanned and read by an optical system, or a film projector projects a film image onto the document table, and the projected image is transmitted to the reading optical system. An image reading device capable of selecting a reading mode, characterized in that in a film reading mode, the reading optical system is fixed in the scanning direction, and the film is moved to read and scan. (2) The image reading device according to claim 1, wherein in the film reading mode, the film is read by moving at a constant speed. (3) The image reading device according to claim 1, wherein in the film reading mode, the film is moved intermittently and the slit projected image is read. (4) The image reading device according to claim 1, wherein the film projection system is built into a pressure bonding plate for holding down a document in a document reading mode.