JPH05316375A - Picture reader - Google Patents

Abstract

PURPOSE:To allow the reader able to read both a reflecting original and a transparent original to use a signal processing circuit for color reading in common. CONSTITUTION:The reader is provided with a reflection original reading optical path 9 and a transparent original reading optical path 14, color line sensors 11, 19 are arranged separately to attain the same signal read direction for reading of reflecting original and for reading of a transparent original, the subscanning start position at both reading is set to the same position, and the reader is provided with a changeover means 35 selecting outputs of both color line sensors 11, 19 by the selection of read line pairs 11R, 19B, read line pairs 11G, 19G, and read line pairs 11B, 19R, and a common signal processing circuit 20 is connected to its output side, and a switch circuit 42 is provided to a final output stage of the signal processing circuit 20 so as to select the output destination to extract the same color of spectral output at both reading from same output terminals 39, 40, 41.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is applicable to digital copying machines, electronic file devices, image scanners as computer peripherals, input units of scanner devices in the printing field, and the like such as ordinary reflection originals and film originals. The present invention relates to an image reading device capable of full-color reading of two types of originals, a transparent original.

[0002]

2. Description of the Related Art Conventionally, various image reading apparatuses capable of reading two kinds of originals, a reflective original and a transparent original, have been proposed as disclosed in, for example, Japanese Patent Laid-Open No. 3-58566. According to the publication, when a reflective original and a transparent original are read by a single image reading device, a light source and an original stand are separately provided for the reflective reading and the transparent reading, and the reflective original set on the original stand is read by an optical reader. A mode of reading by exposure scanning of the system and a mode of reading a transparent original set on another original table by moving the transparent original across the optical path between the imaging lens in the reading optical system and the exposure system were set. It is a thing.

In this publication, there is no mention of a method / means for reading color information in the case of a color original, but in general, light source sequential, spectral filter sequential, dichroic mirror, etc. are used for simultaneous spectroscopy. It is easy to understand that reading and simultaneous reading by a color line sensor are known, and these may be applied.

[0004]

However, the reflection original,
In order to read both transparent originals, color reading is performed using the color line sensor, and the signal processing circuit is also used for both reading the reflective original and reading the transparent original. It is necessary for the signal processing circuit to correct that the reading position of each color component is physically displaced in the sub-scanning direction for each of reading the reflective original and reading the transparent original. In addition, the geometrical arrangement of the main scanning and the sub-scanning of the original by the sensor is naturally restricted by the mechanical scanning method of the original, so that the correction of the sub-scanning positional deviation of the reading as described above is performed by the reflective original. It is generally difficult to achieve the same circuit for reading and reading a transparent original. Therefore, in an image reading apparatus that can handle both reflective originals and transparent originals, it is necessary to take special consideration into the dual use of the signal processing circuit, and a countermeasure is required.

[0005]

A reflective original or a transparent original is exposed and scanned, and light reflected by the reflective original or transmitted through the transparent original is condensed by an imaging lens to have different spectral characteristics in the sub-scanning direction. In an image reading apparatus, which is made to enter a color line sensor having a plurality of reading lines, and obtains image information by detecting an electric signal corresponding to the reflectance of the reflective original or the transmittance of the transparent original as an image signal. According to the first aspect of the present invention, the first scanning traveling body that exposes and scans the reflection original fixed in position and the second scanning traveling body that scans in the same direction at a speed half that of the first scanning traveling body.
An optical path for reading a reflective original is formed by the scanning traveling body, and the transparent original held on the original table fixed to the second scanning traveling body is fixed in position so as to be exposed and scanned as the second scanning traveling body moves. An optical path for reading a transparent original is formed by the optical system described above, and the color line sensor is provided separately so that the signal reading direction is the same when reading the reflective original and when reading the transparent original. The scanning start position of the second scanning traveling member is set as the sub scanning start position of the original at the time of reading the transparent original, and the color line for the reflective original is selected by selecting the reading line at the same relative position in the sub scanning direction. A switching means for selectively switching between the output of the sensor and the output of the color line sensor for the transparent original is provided, a common signal processing circuit is connected to the output side of this switching means, and the reflection original is provided at the final output stage of this signal processing circuit. Read In the case time and transparent original reading was a switch circuit for switching the output destination to retrieve the spectral output of the same color from the same output terminal.

According to a second aspect of the invention, instead of the selection of the read line at the same relative position in the sub-scanning direction, which is the selection method in the first aspect of the invention, a read line for outputting the same spectral information. The switching means is used for selectively switching by selecting.

In the third aspect of the present invention, the reflection original reading optical path and the transmission original reading optical path are configured in the same manner as in the first and second aspects of the present invention, but the reflection original reading optical path and the transmission original reading are performed. An optical path selection means is provided for changing and switching the optical path so that the light from the original is imaged on the same color line sensor, and the sub-scanning starting position of the original during the reading of the reflective original and the reading of the transparent original is used for the second scanning. The delay storage means for setting the scanning start position of the traveling body to correct the reading position deviation between the plurality of reading lines of the color line sensor in the sub-scanning direction, and the delay original reading and the transparent original reading A signal processing circuit having a switch for spectrally inputting different reading line information to the delay storage means is connected to the output side of the color line sensor, and a reflection original reading is performed at the final output stage of the signal processing circuit. The switching circuit for switching the output destination to retrieve the spectral output of the same color from the same output terminal in a time of reading the transparent original is provided.

According to the invention described in claim 4,
In contrast to the described invention, the color line sensor provided separately is arranged so that the signal reading directions are opposite between the reading of the reflective original and the transparent original, and the reading of the reflective original and the transparent original are performed. The sub-scanning start position of the document is set differently to the position opposite to the sub-scanning direction of the second scanning traveling body, and thereafter the same is reflected by selecting the reading line at the same relative position in the sub-scanning direction. A switching means for selectively switching between the output of the color line sensor for the original and the output of the color line sensor for the transparent original is provided, and a common signal processing circuit is connected to the output side of the switching means, and the final signal processing circuit of this signal processing circuit is connected. The output stage is provided with a switch circuit for switching the output destination so that the spectral output of the same color is taken out from the same output terminal when the reflective original is read and when the transparent original is read.

According to the fifth aspect of the invention, in contrast to the second aspect of the invention, the color line sensors provided separately are arranged so that the signal reading directions are opposite between the reading of the reflective original and the reading of the transparent original. Along with the arrangement, the sub-scanning start position of the document at the time of reading the reflective document and that at the time of reading the transmissive document are set to different positions in the sub-scanning direction of the second scanning traveling body.
After that, similarly, there is provided switching means for selectively switching between the output of the color line sensor for the reflective original and the output of the color line sensor for the transparent original by selecting the reading line for outputting the same spectral information. A common signal processing circuit is connected to the output side of the.

Further, in a sixth aspect of the present invention, a combination of these is provided, and the color line sensor provided separately is arranged so that the signal reading direction is the same during the reading of the reflective original and the reading of the transparent original. On the other hand, the sub-scanning starting position of the document during the reading of the reflective original and the reading of the transparent original are set differently in the opposite position in the sub-scanning direction of the second scanning traveling body, and the output of the color line sensor for the reflective original is Switching means for selectively switching the output of the color line sensor for the transparent original is provided, and delay storage means for correcting a reading position shift in the sub-scanning direction between a plurality of reading lines of the color line sensor and each reading line. Further, a signal processing circuit having line data output inverting means for selectively inverting the data output order is connected to the output side of the switching means.

According to the invention described in claim 7, claim 3
Similar to the invention described above, a reflective original reading optical path and a transparent original reading optical path are formed so that light from the original is imaged on the same color line sensor during the reflective original reading and the transparent original reading. An optical path selection means for changing and switching the optical path is provided, and the sub-scanning starting position of the original during the reading of the reflective original and the reading of the transparent original is set at a position opposite to the sub-scanning direction of the second scanning traveling body. A delay storage unit for correcting a reading position shift in the sub-scanning direction between a plurality of reading lines of the color line sensor, and a line data output inverting unit for selectively inverting the data output order for each reading line. The signal processing circuit is connected to the output side of the color line sensor.

[0012]

According to the first aspect of the present invention, the signal reading direction of the color line sensor is the same for reading the reflective original and for reading the transparent original, and the sub-scanning start position is scanned by the second scanning traveling member. Since the start position is set to be the same for reading the reflective original and for reading the transparent original, different color information is used for the reading of the reflective original and the reading of the transparent original at the reading line at the same relative position in the sub-scanning direction. Therefore, a signal processing circuit that is common to both reflective original reading and transparent original reading including correction processing for reading position deviation in the sub-scanning direction is used, and finally, the spectral output of the same color is obtained at the same output terminal by the switch circuit. Just switch to make it compatible with reflective originals / transparent originals.
Most of the color image reading processing can be shared.

According to the second aspect of the present invention, the signal reading direction of the color line sensor is the same for reading the reflective original and for reading the transparent original, and the sub-scanning start position is scanned by the second scanning traveling member. Since the start position is set to be the same when reading a reflective original and when reading a transparent original, the reading line that outputs the same color information is in a relative positional relationship that is opposite in the sub-scanning direction when reading a reflective original and when reading a transparent original. have. Therefore, by selecting the reading line that outputs the same spectral information, the signal processing circuit common to the reflective original reading and the transparent original reading is used, and finally the same spectral output of the same color is output by the switch circuit. Just switch so that you can get to the terminal,
It is possible to perform color image reading processing in which most of the color images are shared by making it compatible with reflective originals / transparent originals.

According to the third aspect of the invention, the signal reading direction of the shared color line sensor is the same for reading the reflective original and for reading the transparent original, and the sub-scanning start position is the second scan. Since the scanning start position of the traveling body is the same for reading the reflective original and for reading the transparent original, the reading lines that output the same color information are reversed in the sub-scanning direction during the reading of the reflective original and the transparent original. Has a relative positional relationship.
Therefore, a delay storage means for correcting the read position shift in the sub-scanning direction is provided in the common signal processing circuit, and a read line that outputs the same spectral information to the delay storage means is selected. By using the signal processing circuit common to the reading of the reflective original and the reading of the transparent original, only by finally switching the switch circuit so that the spectral output of the same color can be obtained at the same output terminal, It becomes possible to perform color image reading processing in which most of the documents are compatible with originals.

According to the present invention, the signal reading direction of the color line sensor is opposite between the reading of the reflective original and the reading of the transparent original, and the sub-scanning start position is set to the reading of the reflective original. Since it is opposite to that at the time of reading the transparent original, different color information is obtained at the reading line at the same relative position in the sub-scanning direction at the time of reading the reflective original and at the time of reading the transparent original.
Therefore, a signal processing circuit that is common to both reflective original reading and transparent original reading including correction processing for reading position deviation in the sub-scanning direction is used, and finally, the spectral output of the same color is obtained at the same output terminal by the switch circuit. By simply switching the setting as described above, it is possible to perform color image reading processing which is compatible with a reflective original / transparent original and is commonly used.

According to the fifth aspect of the present invention, the signal reading direction of the color line sensor is opposite between the reading of the reflective original and the reading of the transparent original, and the sub-scanning start position is set to the reading of the reflective original and the transparent original. Since the reading lines are the same for reading, the reading lines that output the same color information have a relative positional relationship that is opposite in the sub-scanning direction when reading a reflective original and when reading a transparent original. Therefore, by selecting the reading line that outputs the same spectral information, the signal processing circuit common to the reflective original reading and the transparent original reading is used, and finally the same spectral output of the same color is output by the switch circuit. By simply switching the terminals so that they can be obtained, color image reading processing can be performed, which is compatible with a reflective original / transparent original and is commonly used.

On the other hand, according to the sixth aspect of the present invention, the signal reading direction of the color line sensor is the same for reading the reflective original and for reading the transparent original, and the sub-scanning start position is for reading the reflective original. Since the reading lines that output the same color information have the same relative positional relationship in the sub-scanning direction as when reading a reflective original and when reading a transparent original, since the reading lines that output the same color information are opposite to each other, The reading positional relationship in the directions is opposite. Therefore, a common signal processing circuit is used for the reading of the reflective original and the reading of the transparent original including the correction processing of the reading position deviation in the sub-scanning direction, and the data output order is set for each reading line by the line data output inverting means. By switching between the reading and the reading of the transparent original, a color image reading process can be performed, which is compatible with the reflection original / transparent original and is shared in most cases.

Furthermore, the same is true of the invention according to claim 7, the signal reading direction of the shared color line sensor is the same for reading the reflective original and for reading the transparent original, and the sub-scanning start position is set. The reading line that outputs the same color information has the same relative positional relationship in the sub-scanning direction when the reflective original is read and when the transparent original is read. , The reading position relationship with respect to the document in the main scanning direction is reversed. Therefore, a common signal processing circuit is used for the reading of the reflective original and the reading of the transparent original including the correction processing of the reading position deviation in the sub-scanning direction, and the data output order is set for each reading line by the line data output inverting means. By switching between the reading and the reading of the transparent original, a color image reading process can be performed, which is compatible with the reflection original / transparent original and is shared in most cases.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention described in claim 1 will be described with reference to FIG. First, the configuration and operation of the reading optical system will be described. A contact glass 2 for fixedly mounting the reflection original 1 is provided. This contact glass 2
In the lower part of the first scanning traveling body 5 having the exposure lamp 3 and the first mirror 4 mounted thereon, and the second scanning mirror having the second and third mirrors 6 and 7 mounted thereon in the same manner as in the optical scanning type digital copying machine. An optical path 9 for reading a reflected original is formed by the scanning traveling body 8. The reflective original reading optical path 9 is configured to focus the original reflected light image on the color line sensor 11 via the imaging lens 10. Here, the first and second scanning traveling bodies 5 and 8 are moved in the same direction by using the scanning drive motor M as a common drive source.
The scanning speed of the scanning traveling body 8 is set to 1/2 (= v / 2) of the scanning speed v of the first scanning traveling body 5, and the optical path length from the surface of the reflective original 1 to the color line sensor 11 is always constant. Is set. The home position HP, which is the scanning start position of the reflection original 1, is set on the left end side of the contact glass 2 as shown in FIG. 1, and the reading is performed by sub-scanning to the right. Further, the color line sensor 11 has a CCD structure and has, for example, three read lines having different spectral characteristics in the sub-scanning direction. Here, for example, the read line 11 _R for R and the read line 11 for G are provided. having a read line 11 _B for _G and B are used.

On the other hand, on the back surface of the second scanning traveling body 8 in the scanning direction, an original plate 13 made of a transparent member for holding the transparent original 12 in a sandwiched manner is integrally provided. Therefore, the transparent original 12 moves with the sub-scanning movement of the second scanning traveling body 8. The transparent original reading optical path 14 is formed in a fixed state so as to traverse the original table 13. That is, the light from the exposure lamp 15 is deflected by the first mirror 16 to expose the transmissive original 12, and the transmitted light image is deflected by the second mirror 17 to be guided to the imaging lens 18, which is separate from the color line sensor 11. The color line sensor 19 provided in the above is configured to focus and form an image. The color line sensor 19 also has a CCD structure and has, for example, three reading lines having different spectral characteristics in the sub-scanning direction. Here, for example, the reading line 1 for R is used.
9 _R, has a read line 19 _B for reading lines 19 _G and B for G, are set to the same arrangement state and the same signal readout direction and color line sensor 11 side. Also,
The scanning start position HP of the transparent original 12 is the position shown in FIG. 1, that is, the position where the second scanning traveling body 8 is located at the scanning start position HP of the reflective original 1, and is the same position as when the reflective original is read. It is set.

In such an optical system configuration, at the time of reading a reflective original, first, the original surface of the reflective original 1 fixedly set on the contact glass 2 is slit-exposed by the exposure lamp 3, and the reflected light is first and second reflected. 2, 3 mirror 4,
The reading is performed by guiding the image to the imaging lens 10 via 6 and 7 and focusing and forming an image on the color line sensor 11. On the other hand, at the time of reading a transparent original, the transparent original 12 is set on the original table 13 and slit exposure is performed by irradiating the transparent original 12 with the light from the exposure lamp 15 by the first mirror 16, and the transmitted light is transmitted through the second mirror 17. The image is read by being guided to the image forming lens 18 via the light source and focused on the color line sensor 19 to form an image. Here, the sub-scanning is performed by the second scanning traveling body 8 holding the transparent original 12 scanningly moving at the speed of v / 2 as in the reading of the reflective original.

Next, these color line sensors 11
Or configuration related to electrical processing after reading by 19.
The operation will be described. In the present embodiment, the processing is performed by using the common signal processing circuit 20 which is used both for reading the reflective original and for reading the transparent original. The signal processing circuit 20 is composed of three processing circuits for R, G, and B, and a sample hold circuit (S / H circuit) 2 in order from the input side.
1, 22, 23, A / D conversion circuits 24, 25, 26 and shading correction circuits 27, 28, 29 are provided.
The shading correction circuits 27 and 28 have a FIFO (first-in / first-out) functioning as a storage means for delay.
The memories 30 and 31 are connected. Further, correction memories 32, 33, 34 storing reference values for correction are connected to the respective shading correction circuits 27, 28, 29. Here, the S / H circuits 21, 22, 23 are for removing the transfer clock component of the sensor in each spectral component signal, and the A / D conversion circuits 24, 25, 26 are for converting into digital signals. It is a thing. The shading correction circuits 27, 28, and 29 are for electrically correcting variations in brightness due to the illumination system and the imaging system, variations in sensitivity among pixels on the reading lines of the color line sensors 11 and 19, and the like. In advance, the correction memory 32, 33, 3
The correction data stored in No. 4 is corrected by calculating each read pixel.

Further, the FIFO memories 30 and 31 are for correcting the reading position deviation of each color component in the color line sensors 11 and 19 in the sub-scanning direction. For example,
In the configuration of FIG. 1, if the reading of the reflective original 1 is performed by sub-scanning from the left side to the right side, the reading line on the upper side of the color line sensor 11 is read on the preceding reading line on the original. become. Therefore, the output signal of the read line located at the top of the color line sensor 11 is processed by the shading correction circuit 27, and then the line shift amount to the line located at the bottom in the sub-scanning direction (2 lines). It is necessary to align the output signal with the output signal of the bottom read line by delaying the output in the FIFO memory 30 by (minute). The output signal of the second (center line) read line is processed by the shading correction circuit 28, and then the FIFO is shifted by the line shift amount (one line) to the line located at the bottom in the sub-scanning direction. It is necessary to delay it in the memory 31 so as to match the output timing with the output signal of the bottom read line.

On the other hand, in the color line sensor 19, the reverse is true, and the lower the reading line is, the more the reading line on the preceding document is read.
Therefore, after the output signal of the read line located at the bottom of the color line sensor 19 is processed by the shading correction circuit 27, the amount of line deviation (2 lines) up to the line located at the top in the sub-scanning direction. Min) only FIFO
It is necessary to delay the delay in the memory 30 to match the output timing with the output signal of the uppermost read line. The output signal of the read line located at the second (center line) is processed by the shading correction circuit 28, and then the FIFO is shifted by the line shift amount (one line) to the line located at the top in the sub-scanning direction. It is delayed in the memory 31 so that the output signal of the uppermost read line is aligned with the output timing.

However, since the signal processing circuit 20 is used for both reading the reflective original and reading the transparent original,
A switch circuit 35 serving as a switching unit is provided between the color line sensors 11 and 19 and the signal processing circuit 20. The switch circuit 35 has switches 36, 37, 38 for three lines which are switched by selecting a reflective original reading / transparent original reading mode. Switch 36 FIFOs the preceding read line 11 _R or 19 _B into the FIFO.
A switch 37 selectively connects the intermediate read line 11 _G or 19 _G to the line of the S / H circuit 22 with the FIFO memory 31 and selectively connects to the line of the S / H circuit 21 with the memory 30. The switch 38, however, selectively connects the subsequent read line 11 _B or 19 _R to the line of the S / H circuit 23 which does not have the FIFO memories 30 and 31. That is, those having the same relative position (preceding / trailing relationship) in the sub-scanning direction are connected to the same processing line. FIG. 1 shows a switch state when reading a reflection original.

Further, three output terminals 39, 40 and 41 for R, G and B are set in the final output stage of the signal processing circuit 20, and the spectral output of the same color of the signal processing circuit 20 is read at the time of reflection original reading. A switch circuit 42 for switching the output destination is provided so that the same output terminal outputs the data when the transparent document is read. The switch circuit 42 is a FIFO memory 3
It is composed of switches 43 and 44 for switching between the output from 0 and the output from the shading correction circuit 29.

Therefore, according to this embodiment, the signal reading directions of the color line sensors 11 and 19 are the same, and
Since the sub-scanning start positions are set to the same HP, the reading line at the same relative position in the sub-scanning direction,
For example, the read line 11 _R and the read line 19 _B have different color information (R and B), and the read line 11 _B and the read line 19 _R have different color information (B and R) (however, in the center). Read lines 11 _G and 19 _G have the same color information). Therefore, the signal processing circuit 20 is shared during the reading of the reflective original and the reading of the transparent original including the correction of the reading position deviation in the sub-scanning direction by the FIFO memories 30 and 31, and finally, the mode reading by the switch circuit 42 is performed. Also in the case of (1), the R signal is output from the output terminal 39, the G signal is output from the output terminal 40, and the B signal is output from the output terminal 41, so that most of the reflective original 1 and the transparent original 12 are shared. Color reading processing becomes possible.

Next, an embodiment of the invention described in claim 2 will be described with reference to FIG. The same parts as those shown in the above-mentioned embodiments are designated by the same reference numerals (the same applies to the following embodiments). Basically, it is the same as that of the above-described embodiment, but with respect to the outputs of the color line sensors 11 and 19, the read circuit which outputs the same spectral information is connected to the same processing system by the switching circuit 45 serving as a switching means. In place of the switch circuit 35. That is, this switch circuit 45 is also switched by switches 46 and 4 for three lines, which are switched by selecting a reflective original reading / transparent original reading mode.
It has 7,48. The switch 46 selectively connects the read line 11 _R or 19 _R for _R to the line of the S / H circuit 21, and the switch 47 selects the read line 1 for G.
1 _G or 19 _G is selectively connected to the line of the S / H circuit 22, and the switch 48 is a read line 11 _B or 19 _{B for B.}
Is selectively connected to the line of the S / H circuit 23. Here, as described above, the preceding read line 11
For _R, 19 _B, for applying a delay process to correct the registration error in the sub-scanning direction, a reflective original reading / transmission by the mode selection of the document reading by the switch 49 is provided for inputting to the FIFO memory 30 There is. FIG. 2 shows a switch state at the time of reading a reflection original.

Therefore, also in the case of this embodiment, color reading is performed using the color line sensors 11 and 19, and both reading of the reflection original 1 and the transmission original 12 are possible.
In addition, it is possible to read the color image by using the signal processing circuit 20 in common during the reading of the reflective original and the reading of the transparent original.

An embodiment of the invention described in claim 3 will be described with reference to FIG. In this embodiment, the color line sensor 1
9 is omitted and one color line sensor 11 is commonly used, and a deflecting mirror 5 is provided at the subsequent stage of the imaging lens 18.
0 is provided, and an image forming lens 1 is used when reading a reflection original.
The image forming lens 1 is retracted to the outside of the optical path of 0 and at the time of reading a transparent original.
After the optical path of No. 8 is deflected by the mirror 50, the position of the mirror 51 is changed and the optical path selecting means is deflected and guided to the color line sensor 11.

Therefore, in the case of the present embodiment, the color line sensor 11 is also used for reading the reflective original / transparent original, so that a switch circuit is not required at the input stage of the signal processing circuit 20. However, the reading lines 11 _R , 1 in the sub-scanning direction are read during the reading of the reflective original and the reading of the transparent original.
Since the leading and trailing relations of 1 _G and 11 _B are reversed, the configuration of the latter stage of the signal processing circuit 20 is the same as that of the embodiment shown in FIG.

Also in the case of this embodiment, the same effect as that of the above-described embodiment can be obtained, and since one color line sensor 11 is shared by both readings, the cost can be further reduced.

Further, an embodiment of the invention described in claim 4 will be described with reference to FIG. Basically, the configuration is similar to that of FIG. 1, but in the present embodiment, the sub-scanning start position is set to be different between when reading a reflective original and when reading a transparent original. That is, the sub-scanning start position when reading a reflective original does not change, but the sub-scanning start position when reading a transparent original is the second position.
When the scanning traveling body 8 reaches the return position which is on the rightmost side, it becomes the home position on the side of the document table 13,
It is set so that the scanning scanning of the transparent original 12 is performed by the scanning movement of the second scanning traveling body 8 from the right side to the left side. As a result, on the color line sensor 19 for reading the transparent original, the order of preceding and following in the sub-scanning direction is opposite to that in the case of FIG. 1, and the main scanning direction is also opposite. Therefore,
In this embodiment, the arrangement of the color line sensor 19 for reading the transparent original is reversed in the vertical and horizontal directions as compared with the case of FIG.

The structure of the color line sensors 11 and 19 and thereafter is the same as that of FIG. Therefore, also in the case of this embodiment, the same effect as that of the above-described embodiment can be obtained.

An embodiment of the invention described in claim 5 will be described with reference to FIG. Basically, the configuration is the same as in the case of FIG. 2, but in the present embodiment, the sub-scanning start position is set to be different between when reading a reflective original and when reading a transparent original, according to the case of FIG. ing. That is, the sub-scanning start position during the reading of the reflective original does not change, but the sub-scanning starting position during the reading of the transparent original is about the original table 13 side when the second scanning traveling body 8 is at the return position which is on the rightmost side. The home position is set, and the scanning scanning of the second scanning traveling body 8 from the right side to the left side is performed so that the reading scanning of the transparent original 12 is performed. As a result, on the color line sensor 19 for reading the transparent original, the order of preceding and following in the sub-scanning direction is opposite to that in the case of FIG. 1, and the main scanning direction is also opposite. Therefore, in this embodiment, the arrangement of the color line sensor 19 for reading the transparent original is reversed in the vertical and horizontal directions as compared with the case of FIG.

The structure of the color line sensors 11 and 19 and thereafter is the same as in the case of FIG. Therefore, also in the case of this embodiment, the same effect as that of the above-described embodiment can be obtained.

Next, an embodiment of the invention described in claim 6 will be described with reference to FIG. In this embodiment, the sub-scanning direction at the time of reading the transparent original is set as in the case of FIG. 4 and is made different from that at the time of reading the reflective original, but the color line sensor 19 is not reversed in the vertical and horizontal directions, and the color line sensor 19 shown in FIG. The arrangement is as it is. As a result, when the switches 46, 47, and 48 are used to select the line information at the same relative position in the sub-scanning, the same spectral line information is selected. That is, the switch 46 is for R, the switch 47 is for G,
The switch 48 is for B, and the switch circuit 42 on the output side is unnecessary. On the other hand, since the main scanning direction is reversed between the reading of the reflective original and the reading of the transparent original, in the present embodiment, line data output inversion in which the data output order is inverted for each line when reading the transparent original in the final output stage. Through / mirroring circuits 52, 53, 54 are provided as circuits. These through / mirroring circuits 5
Reference numerals 2, 53, and 54 are switched depending on the mode selection of the reflective original reading / transparent original reading, and when reading the reflective original, nothing is output and the output is through. However, it is also possible to switch the through / mirroring circuits 52, 53, 54 by an operator's operation and to exert a mirroring function of inverting the original output so that the original output is intentionally reversed.

Therefore, also in the case of this embodiment, the same effect as that of the above-mentioned embodiment can be obtained.

Further, an embodiment of the invention described in claim 7 will be described with reference to FIG. In the present embodiment, the through / mirroring circuits 52, 53, 5 are used in the same manner as in the above-described embodiment with respect to the combined use of the single color line sensor 11 shown in FIG.
It is a combination of four. Also in the case of this embodiment, the same effect as the above-mentioned embodiment can be obtained.

[0040]

According to the present invention, the color line sensor for reading the reflective original and the color line sensor for reading the transparent original are separately provided, and the signal reading directions are different. Since the switching means, the switch circuit, and the line data output reversing means are combined in accordance with the same / opposite arrangement and the setting of the same / opposite sub-scanning start position when reading the transparent original, the reading in the sub-scanning direction is performed. A common signal processing circuit is used for both reflective original reading and transparent original reading, including misalignment correction processing, and finally, switching is performed by the switch circuit so that spectral output of the same color is obtained at the same output terminal, or line Only by reversing by the data output reversing means, it is possible to make a color image reading process compatible with a reflective original / transparent original and mostly shared.

According to the inventions described in claims 3 and 7, the same effect can be obtained. However, since the same color line sensor is used for both the reflective original reading and the transparent original reading, in addition to the above effects, The cost can be further reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an optical system and an electrical processing system of an embodiment of the invention described in claim 1 together.

FIG. 2 is a configuration diagram showing an optical system and an electrical processing system of an embodiment of the invention described in claim 2 together.

FIG. 3 is a configuration diagram showing an optical system and an electrical processing system of an embodiment of the invention described in claim 3 together.

FIG. 4 is a configuration diagram showing an optical system and an electric processing system of an embodiment of the invention described in claim 4 together.

FIG. 5 is a configuration diagram showing an optical system and an electrical processing system of an embodiment of the invention described in claim 5 together.

FIG. 6 is a configuration diagram showing an optical system and an electrical processing system of an embodiment of the invention described in claim 6 together.

FIG. 7 is a configuration diagram showing an optical system and an electrical processing system of an embodiment of the invention described in claim 7 together.

[Explanation of symbols]

1 Reflective Document 5 First Scanning Traveling Body 8 Second Scanning Traveling Body 9 Optical Path for Reading Reflective Document 10 Imaging Lens 11 Color Line Sensor 11 _R , 11 _G , 11 _B Reading Line 12 Transparent Document 13 Document Plate 14 For Reading Transparent Document Optical path 18 Imaging lens 19 Color line sensor 19 _R , 19 _G , 19 _B Read line 20 Signal processing circuit 30, 31 Delay storage means 35 Switching means 39, 40, 41 Output terminal 42 Switch circuit 45 Switching means 49 Switch 50 Optical path Means of selection

Claims (7)

[Claims] 1. A plurality of reading lines having different spectral characteristics in the sub-scanning direction, which is formed by exposing and scanning a reflective original or a transparent original and condensing light reflected by the reflective original or transmitted through the transparent original by an imaging lens. In an image reading apparatus configured to obtain image information by inputting a color line sensor having, and detecting an electric signal corresponding to the reflectance of the reflective original or the transmittance of the transparent original as an image signal,
An optical path for reading a reflective original is formed by a first scanning traveling body that exposes and scans the positionally fixed reflective original and a second scanning traveling body that scans in the same direction at a speed half that of the first scanning traveling body. An optical path for reading a transparent original is formed by an optical system whose position is fixed so as to expose and scan the transparent original held on the original table fixed to the second scanning carriage with the movement of the second scanning carriage. , The color line sensor is arranged separately so that the signal reading directions are the same when reading a reflective original and when reading a transparent original, and sub-scanning of the original at the time of reading a reflective original and when reading a transparent original is started. The position is set to the scanning start position of the second scanning traveling body, and the output of the color line sensor for the reflective original and the output of the color line sensor for the transparent original are selected by selecting the reading line at the same relative position in the sub-scanning direction. Select and switch Switching means is provided, and a common signal processing circuit is connected to the output side of this switching means, and the same output spectral output of the same color is output to the final output stage of this signal processing circuit at the time of reading a reflective original and at the time of reading a transparent original. An image reading apparatus comprising a switch circuit for switching an output destination so as to be taken out from a terminal. 2. A plurality of reading lines having different spectral characteristics in the sub-scanning direction, which are exposed and scanned on a reflection original or a transmission original, and the light reflected by the reflection original or transmitted through the transmission original is condensed by an imaging lens. In an image reading apparatus configured to obtain image information by inputting a color line sensor having, and detecting an electric signal corresponding to the reflectance of the reflective original or the transmittance of the transparent original as an image signal,
An optical path for reading a reflective original is formed by a first scanning traveling body that exposes and scans the positionally fixed reflective original and a second scanning traveling body that scans in the same direction at a speed half that of the first scanning traveling body. An optical path for reading a transparent original is formed by an optical system whose position is fixed so as to expose and scan the transparent original held on the original table fixed to the second scanning carriage with the movement of the second scanning carriage. , The color line sensor is arranged separately so that the signal reading directions are the same when reading a reflective original and when reading a transparent original, and sub-scanning of the original at the time of reading a reflective original and when reading a transparent original is started. The position is set to the scanning start position of the second scanning traveling body, and the output of the color line sensor for the reflective original and the output of the color line sensor for the transparent original are selected by selecting the reading line that outputs the same spectral information. Select and switch A common signal processing circuit is connected to the output side of the switching means, and the spectral output of the same color is output to the same output terminal at the final output stage of this signal processing circuit at the time of reading the reflective original and that of the transparent original. An image reading apparatus comprising a switch circuit for switching an output destination so that the image is taken out from the image reading apparatus. 3. A plurality of reading lines having different spectral characteristics in the sub-scanning direction, which is formed by exposing and scanning a reflective original or a transparent original and condensing light reflected by the reflective original or transmitted through the transparent original by an imaging lens. In an image reading apparatus configured to obtain image information by inputting a color line sensor having, and detecting an electric signal corresponding to the reflectance of the reflective original or the transmittance of the transparent original as an image signal,
An optical path for reading a reflective original is formed by a first scanning traveling body that exposes and scans the positionally fixed reflective original and a second scanning traveling body that scans in the same direction at a speed half that of the first scanning traveling body. An optical path for reading a transparent original is formed by an optical system whose position is fixed so as to expose and scan the transparent original held on the original table fixed to the second scanning carriage with the movement of the second scanning carriage. An optical path selecting means is provided for changing and switching the optical path so that the light from the original is imaged on the same color line sensor during the reading of the reflection original and the reading of the transparent original. A delay memory for setting the sub-scanning start position of the document with respect to time to the scanning start position of the second scanning traveling body and correcting the reading position shift in the sub-scanning direction between the plurality of reading lines of the color line sensor. Means and reflective manuscripts A signal processing circuit having a switch for spectrally inputting different reading line information to the delay storage means at the time of taking and at the time of reading the transparent original is connected to the output side of the color line sensor, and this signal processing is performed. An image reading apparatus characterized in that a switch circuit is provided at the final output stage of the circuit to switch the output destination so that spectral outputs of the same color are taken out from the same output terminal when reading a reflective original and when reading a transparent original. 4. A plurality of reading lines having different spectral characteristics in the sub-scanning direction, which is formed by exposing and scanning a reflective original or a transparent original and condensing light reflected by the reflective original or transmitted through the transparent original by an imaging lens. In an image reading apparatus configured to obtain image information by inputting a color line sensor having, and detecting an electric signal corresponding to the reflectance of the reflective original or the transmittance of the transparent original as an image signal,
An optical path for reading a reflective original is formed by a first scanning traveling body that exposes and scans the positionally fixed reflective original and a second scanning traveling body that scans in the same direction at a speed half that of the first scanning traveling body. An optical path for reading a transparent original is formed by an optical system whose position is fixed so as to expose and scan the transparent original held on the original table fixed to the second scanning carriage with the movement of the second scanning carriage. , The color line sensor is arranged separately so that the signal reading directions are opposite when reading a reflective original and when reading a transparent original, and sub scanning of the original at the time of reading a reflective original and when reading a transparent original is started. The position is set differently in the position opposite to the sub-scanning direction of the second scanning traveling body, and the output of the color line sensor for the reflection original and the transmission original for the transparent original are selected by selecting the reading line at the same relative position in the sub-scanning direction. Color line sensor Switching means for selectively switching between output and output is provided, and a common signal processing circuit is connected to the output side of this switching means, and the same output color is used at the final output stage of this signal processing circuit when reading a reflective original and reading a transparent original. An image reading apparatus comprising a switch circuit for switching an output destination so that spectral output is taken out from the same output terminal. 5. A plurality of reading lines having different spectral characteristics in the sub-scanning direction, which is formed by exposing and scanning a reflective original or a transparent original and condensing light reflected by the reflective original or transmitted through the transparent original by an imaging lens. In an image reading apparatus configured to obtain image information by inputting a color line sensor having, and detecting an electric signal corresponding to the reflectance of the reflective original or the transmittance of the transparent original as an image signal,
An optical path for reading a reflective original is formed by a first scanning traveling body that exposes and scans the positionally fixed reflective original and a second scanning traveling body that scans in the same direction at a speed half that of the first scanning traveling body. An optical path for reading a transparent original is formed by an optical system whose position is fixed so as to expose and scan the transparent original held on the original table fixed to the second scanning carriage with the movement of the second scanning carriage. , The color line sensor is arranged separately so that the signal reading directions are opposite when reading a reflective original and when reading a transparent original, and sub scanning of the original at the time of reading a reflective original and when reading a transparent original is started. The position is set differently in the position opposite to the sub-scanning direction of the second scanning traveling body, and the output of the color line sensor for the reflective original and the color for the transparent original are selected by selecting the reading line that outputs the same spectral information. Line sensor output Switching means for selecting switching the provided,
Connect a common signal processing circuit to the output side of this switching means,
An image reading apparatus provided with a switch circuit at the final output stage of the signal processing circuit for switching the output destination so that the spectral output of the same color is taken out from the same output terminal when reading a reflective original and when reading a transparent original. .. 6. A plurality of reading lines having different spectral characteristics in the sub-scanning direction, which are exposed and scanned on a reflection original or a transmission original, and the light reflected by the reflection original or transmitted through the transmission original is condensed by an imaging lens. In an image reading apparatus configured to obtain image information by inputting a color line sensor having, and detecting an electric signal corresponding to the reflectance of the reflective original or the transmittance of the transparent original as an image signal,
An optical path for reading a reflective original is formed by a first scanning traveling body that exposes and scans the positionally fixed reflective original and a second scanning traveling body that scans in the same direction at a speed half that of the first scanning traveling body. An optical path for reading a transparent original is formed by an optical system whose position is fixed so as to expose and scan the transparent original held on the original table fixed to the second scanning carriage with the movement of the second scanning carriage. , The color line sensor is arranged separately so that the signal reading directions are the same when reading a reflective original and when reading a transparent original, and sub-scanning of the original at the time of reading a reflective original and when reading a transparent original is started. A switching means is provided which is set to a position opposite to the sub-scanning direction of the second scanning traveling body and is selectively switched between the output of the color line sensor for the reflective original and the output of the color line sensor for the transparent original. ,
A signal having delay storage means for correcting reading position shifts in the sub-scanning direction between a plurality of reading lines of the color line sensor and line data output inverting means for selectively inverting the data output order for each reading line. An image reading apparatus characterized in that a processing circuit is connected to an output side of the switching means. 7. A plurality of reading lines having different spectral characteristics in the sub-scanning direction, which is formed by exposing and scanning a reflective original or a transparent original and condensing light reflected by the reflective original or transmitted through the transparent original by an imaging lens. In an image reading apparatus configured to obtain image information by inputting a color line sensor having, and detecting an electric signal corresponding to the reflectance of the reflective original or the transmittance of the transparent original as an image signal,
An optical path for reading a reflective original is formed by a first scanning traveling body that exposes and scans the positionally fixed reflective original and a second scanning traveling body that scans in the same direction at a speed half that of the first scanning traveling body. An optical path for reading a transparent original is formed by an optical system whose position is fixed so as to expose and scan the transparent original held on the original table fixed to the second scanning carriage with the movement of the second scanning carriage. An optical path selection means for changing and switching the optical path so that light from the original is imaged on the same color line sensor during reading of the reflective original and during reading of the transparent original,
The sub-scanning start position of the original during the reading of the reflective original and the reading of the transparent original is set differently in the opposite position in the sub-scanning direction of the second scanning traveling body, and the sub-interval between the plurality of reading lines of the color line sensor is set. A signal processing circuit having a delay storage means for correcting the reading position shift in the scanning direction and a line data output inverting means for selectively inverting the data output order for each reading line is connected to the output side of the color line sensor. An image reading device characterized by the above.