JPS6072474A - Reader - Google Patents

Abstract

PURPOSE:To obtain a reader having the capacity of sure detection of the presence of an original or the size of the original by providing a light source for one scanning line's share to a side opposite to the side of an original placing plate provided with a scanner and detecting the original in response to the output of a photoelectric transducing element in the scanner by the light from said light source. CONSTITUTION:The original placing plate 7 is fixed to a main body 1 and scanner 11 scanning optically the original O placed on the original placing plate 7 and reading a picture is provided to the lower part of the original placing plate 7 by reciprocating the scanner along the lower face of the plate 7 in the arrow (a) in Fig. The scanner 11 consists of a lighting lamp 12, a photoelectric transducing section 13, a light converging optical fiber 14, and a carriage 15. The photoelectric transducing section 13 outputs picture information as green, yellow and cyan color signals by applying photoelectric transducing to the reflected light from the original O and consists mainly of four CCD line image sensors (CCD elements) 711-714 arranged in zigzag (in parallel with each other) and a printed board.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a reading device for reading image information used in an image forming apparatus such as a thermal transfer color copying machine.

[Technical background of the invention and its problems]

Recently, a thermal transfer color copying machine that performs color copying using, for example, thermal transfer ink ribbons of a plurality of colors has been considered. This copying machine scans and reads a document using an optical scanning means, and generates image information (color signal of light).
This image information is converted into a color signal corresponding to each ink color of the thermal transfer ink ribbon, the corresponding ink area of the thermal transfer ink ribbon is selected according to this color signal, and the ink is transferred to the paper by the thermal head. By heat transfer to
Color copying is performed by sequentially transferring one color to paper.

Conventionally, image information is collected by the scanning means using a photoelectric conversion element such as a COD image sensor.

Therefore, 5. When attempting to detect the presence or absence of a document or the size of the document using the light source of the scanning means and the CCD image sensor, if the document and the inner surface of the document table cover have similar colors, There was a problem that a level difference was generated in the detection signal, and the presence or absence of a document or the size of the document could not be detected.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object thereof is to provide a reading device that can reliably detect the presence or absence of a document or the size of the document.

[Summary of the invention]

In this invention, a light source for one scanning line is provided on the opposite side of the document table to the side where the scanner is arranged, and the document is detected according to the output of a photoelectric conversion element in the scanner using light from this light source. It was designed to do so.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 and 2 schematically show a thermal transfer type color copying machine according to the present invention. That is, 1 is a main body of a copying machine, and an operating panel 2 is provided at the front of the upper surface of the main body 1. For this operation/mother panel 2, copy key 39
A number display section 4, a display section 5 for displaying the operating state, a numeric keypad 6, etc. are provided. And the left side of main body 1 is the manuscript table (transparent glass plate)? There is a document scanning section 8 that scans and reads the document set thereon, and an image forming section 9 on the right side. Note that 10 is a document cover provided on the document table 7 so as to be openable and closable.

As shown in FIG. 3, the document cover 10 is provided with an LED array 73 as a light source.

This LED array 73 is configured to be able to illuminate a width corresponding to one scanning line of the document table 7, and the illumination state 73a of the document table 7 by the LED array 73 is as shown in FIG. Further, a detector such as a magnetic switch 74 for detecting opening/closing of the document cover 10 is provided near the LED array 73.

The document scanning section 8 is configured as shown in FIGS. 2, 3, and 5, for example. In other words, the document table 74
The main body IK is fixed, and the lower part of the document table 70 is moved back and forth in the direction of the arrow a shown in the figure along the lower surface of the document table 70. A scanner 1111751 for optical scanning and reading is provided. This scanner 11, as shown in FIGS. 6 and 7,
i lamp 12 illuminating the original O. From manuscript 0. ffJH
□3: Light, 6□[1,+,[@Oka, 11=纺,, the light-converging optical fiber 14 guided to the section 13, 1:6 by the carriage 15 that supports them. Composition::Constitution:1 is done. The photoelectric conversion section 13
The system outputs image information as green, yellow, and cyan color signals by photoelectrically converting the 1 reflected light from document 0 to '1, as shown in Fig. 7, for example. Four 1CφD line image sensors (CCD elements) arranged in a staggered pattern (alternately in parallel).
Currently, it is mainly composed of 711...714 and a printed circuit board 72.

As shown in FIGS. 6 to 8, the detection lines of the CCD elements 7Jl, 71a and "21714 are placed on the printed circuit board 72 at the same distance as the effective field of view Δt of the light-focusing glass film 14. They are arranged in parallel.

The width Δt corresponds to several scanning lines, and corresponds to an integral multiple of the step and angle of the scanning motor 8, which will be described later. The effective reading length of the CCD elements 711 is b, and four of them can read a document with a length and width of 4b, and if n CCD elements 711 are lined up, nb
Can read originals of different widths, freely select the width (reading),
I will teach you how to do it. The above CCD Saiko 71F... has 9 green (G), yellow (Y), cyan (C), green (G), and yellow for each pixel of the original as shown in Figure 9. (Wow, Cyan (
It is separated into elements for extracting the color signal □ of C. Further, the carriage 15 is guided by a guide rail 16 and a guide shaft 12 so as to be able to reciprocate in the direction of arrow a, as shown in FIG. 4(i). A driving pulley 19 driven by a scanning motor (Noyals motor) 18 that can be forward and reverse is provided at one end of the guide shaft 17, and a driven booby IJ 20 is provided at the other end. Boo+)19. t.

A timing belt 21 is stretched between them.

Further, one point of the timing belt 21 is fixed to the carriage 15 via a fixing member 22. This results in
When the scanning motor 18 rotates forward or backward, the carriage 15 moves linearly.

Further, the image forming section 9 may be configured, for example, in FIGS. 2 and 1.
It is configured as shown in Figure 0. That is, the image forming section 9
A platen 30 is disposed approximately in the center of the image forming apparatus, and a thermal head 31 is disposed on the left side facing the platen 30. The thermal head 31 is
It is attached to a heat radiator 23 that is integrally formed on the rear end surface of the holder 32. A ribbon cassette 35 containing a thermal transfer ink ribbon 34 as a thermal transfer material is detachably attached via the boulder 32, and a thermal transfer clip pin 34 is interposed between the thermal head 31 and the platen 30. It becomes. Above 4? Nkase, 21.
35 is a thermal transfer ink ribbon 3 as shown in FIG.
Two parallel winding cores i6. :tv
In addition, the thermal transfer ink ribbon 34 is enclosed in a case 38 with a part thereof exposed so as to be interposed between the platen 30 and the thermal head 31. . When the ribbon cassette 35 is installed, the cores 36 and 37 are connected to a drive shaft of a motor (not shown) via a drive force transmission mechanism (not shown), and are rotated as required. Further, as shown in FIG. 2, the ribbon cassette 35 can be inserted into or removed from the holder 32 through an insertion/removal port 39 formed on the right side of the main body 1.

Note that the insertion/removal port 39 is provided with an outer lid body 4θ that can be opened and closed.

On the other hand, a paper feed roller 4 is located diagonally below the right side of the platen 30.
1 is provided, and the paper P as a transfer material stored in the paper feed cassette 42 is taken out one by one. Then, the paper P taken out by the paper feed roller 41 is
The sheet is sent to a registration roller 43 disposed diagonally above and to the right of the feed roller 41, and its leading edge is aligned.Then, the sheet is transported by the registration roller 43 toward the platen 3o, and the sheet is transferred to the platen 30 by pressing rollers 44 and 45. 9, which allows it to be fed accurately. Here, the paper feed cassette 42 is detachable from the front of the main body 1. Note that 46 in FIG. 8 is a manual paper feeder for manually feeding the paper P.

However, for thermal transfer, the third step is thermal transfer ink ribbon 34.
The paper P is pressed against the platen 3o through all the media, and the 11th
As shown in the figure, all of the ink 47 as a colorant on the thermal transfer ink ribbon 34 is thermally melted and transferred onto the paper P.

The thermal transfer ink ribbon 34 has yellow, magenta, cyan, and black ink portions 47Y, 47M each having a width approximately equal to that of the paper P, as shown in FIGS. 11 and 12', for example.

47C*47Bk are arranged in sequence, and after transferring one color at a time, the paper P is returned to the transfer start position, and the sheets are overlapped one after another accurately.

In this way, the paper P is moved back and forth by the number of colors by the rotation of the platen 30, but the path of the paper P at that time is
The first paper trays are sequentially arranged along the lower surface of the paper discharge tray 48 which is inclined and protrudes from the main body 1. It is guided onto the second guide plate 49,50. This includes the platen 30 and the first. The first guide plates 49 and 50 are respectively provided between the ends of the second guide plates 49 and 50. This is done by the second distribution gates 51 and 52. That is,
First, the paper P taken out from the paper feed cassette 42 is transported through the reno roller 43 and the first sorting dart 51, and its leading end is wrapped around the platen 30. Next, the platen 30 is rotated in the forward direction by a pulse motor (not shown) to transport the paper P at a constant speed, and the thermal heads 32 arranged in a line tod shape along the axial direction of the platen 30 are rotated in the forward direction. Heat generating element (
(not shown) generates heat in accordance with the image information, and the ink 47 of the thermal transfer ink cartridge 34 is transferred onto the paper P. Then, the leading edge of the paper P that has passed through the platen 3'0 is placed on the second distribution gate 52 located at the solid line position and on the first guide plate 49 provided along the lower surface of the paper output tray 48. Sent. Thus, one color of ink 47
When the transfer is completed, the platen 3o is rotated in the opposite direction, so that the paper P is transported backwards and returned to the transfer start position. At this time, the first sorting dart 51 is rotated to the position indicated by the two-dot chain line, and the rear end of the paper P is forced onto the second guide plate 50 provided along the lower surface of the first guide plate 49. .

In this way, a plurality of colors are transferred by moving the paper P back and forth a plurality of times. Finally, the paper P on which all the colors of ink 47 have been transferred is guided to the paper ejection roller 53 by the second distribution gate 52, which is rotated to the position indicated by the two-dot chain line. 53 onto the paper ejection tray 48.

FIG. 13 schematically shows the control circuit. That is, 6' is a main control unit that controls the entire copying machine, and is mainly composed of a CPU (central processing unit) and its peripheral circuits, to which a pass line 62 is connected. There is. And the above bass line:/62VC is 1. The border panel 2. LED 7V ear 3, document cover open/close detector 74. Scanner control unit 63.
The photoelectric conversion unit 132 color conversion unit 64° conveyance control unit 65.
A thermal head driving section 66, a thermal head temperature control section 62. A storage section 68 and a document size determination section 69 are connected to each other.

The scanner control section 63 operates in response to a signal sent from the main control section 6 via the pass line 62, and operates to control the scanner 11.
The illumination runzo 121, the power converter 13, and the scanning motor 18 are each driven and controlled. The photoelectric conversion section 13 is
The image on the document is detected in accordance with the signal sent from the main control section 61 via the pass line 62, and the light color signal is output as described above.

As shown in FIG. 14, the photoelectric conversion section 13 includes CCD elements 711 to 714. Amplifier 811...81t, A/D
Converters 821...824. Buffer memory 83.
...834, analog switch 841...844.
Panfa 7% 1,8511. ．． 1B, 41,'
y, 79. X・□686゜゜nogurusu oscillator 87
and an address counter 88.

That is, 1,000 CCD elements 71, 714, .
An analog signal (photoelectric conversion signal) is taken out serially from the CCD unit 811.
Amplified by 81-, A/D = + 7 /7 2 82
1...824. This tR) b X oscillation g5□8. The amplifier 81 operates according to the pulse from
The signal from F...□8C is converted into D□ and supplied to buffer memory I)'851...854. The above buffer memo IJ 85. , 853 are C in FIG.
CCD element 711゜7 for the time corresponding to the deviation Δt of the detection line between CD element 7J, 713 and 712, 714.
The main controller 6 has a capacity to store the information read by the main controller 6, and corrects the difference □ of Δt.
The data is read out in order from the oldest data by the readout signal R1 of one or more and is supplied to the analog switch 841+8'4B. Here, if the relative speed of the CCD element 711... and the document 0 is "τ" (constant speed), then "Δt=Δt
CCD elements 711° 713 and 712 with a time difference of 7v j
By reading the +714 data, it is as if one scanning line's worth of image/image information can be read at the same time. Also, the above buffer memo 17852, 85
4 each has a data capacity for two scanning lines, one for reading and one for sending out, and the data for sending out is read out by the read signal R1 from the main control section 61, and analog switches 842, 844 supplied to The above analog switches 84]...844 are respectively A/DiJ
? The buffer memory 83 . ... Signal f supplied from 834
y IJ-n (G), yellow (Y), cyan (C
) into each color signal, ・Muffer memory 851 ・・
・Required (supplied) to 854. This buffer memory 851・
...No.85 is analog switch 841...8
By storing the signals for each color supplied from 4hi)' in the address indicated by the address counter 88,
Each color is stored in a different memory area.

On the other hand, the color conversion section 64 receives and processes the @ issue output from the photoelectric conversion section 13, converts it into color signals of each ink of yellow, magenta, cyan, and black, and converts each color signal into a mass line and a mass line. Outputs 62VC. Further, the color converter 64 can also perform color conversion on the signal sent from the 1-noise line 62 and output a new signal to the line 62. The conveyance fli control section 65 operates in response to signals sent from the main phase section 61 and the mass line 62, and drives the platen 3θ. A motor that drives the winding core 36.37 of the ink cartridge 35, a motor that drives the paper feed roller 41, registration roller 43, paper discharge roller 53, etc., and a solenoid that drives the first and second distribution gates 52, 52. (none of which are shown).

The thermal head driving section 66 operates in response to a signal sent from the main control section 61 via the pass line 62 and a signal from the thermal head temperature control section 67 to drive and control the heating element of the thermal head 31. do. The thermal head temperature 1++ control section 67 outputs a temperature control signal to the thermal head driving section 66 in response to a signal sent from the main control section 61 via the panel 1 line 62. The storage section 6B operates in response to a signal sent from the main control section 61 via the pass line 62, and stores the information sent via the pass line 62 or outputs the recorded information. I do.

Furthermore, when the copy key (not shown) on the operation panel is turned on and the detector 74 detects that the document cover 10 is closed, the main control section 6 causes the IJD array 73 to emit light. It illuminates the top of the document table z with light.

At this time, the color signal of one color signal obtained by the photoelectric conversion section 13, for example, the color signal for one scanning line of yellow, is converted into a dot pattern for each color by the color conversion section 64-C, and is therefore converted into a dot pattern for each color. 69. This original size determination sound b69 is for determining the size of the original by 4'tl according to the supplied color signal for one scanning line, that is, the number of consecutive dots and dots.
As shown in the figure, the counter 91 and comparison times w59271
1'- et al. That is, ゛, consecutive f minutes, do F
, 7) are counted by the counter 91, and this counting result is B5.
゜A4. When the number exceeds B4, the comparison circuit 92 outputs different signals.

Furthermore, the main control f''JJ361 controls the document size 4'4.
] The paper set to be fed is selected according to the size signal from the fixing section 69.

, -+ -h J〆+ -1' +r, >-+ -/d
11. 〃+= -c+ e(5 days → turn.For example, the operator has placed the original O on the original platen 7, closed the original cover 10, and then fully inserted the copy key (not shown). Then, the document cover opening/closing detector 74 detects that the document cover 10 is closed.As a result, the main controller 6 causes the LED array 73 to emit light.The light from the IJD array 73 is transmitted through the document table 7. CC in the photoelectric conversion unit 13
It is guided to D elements 711 to 7C. In other words, CCD element 7
1, to 7 J4' are blocked by the original O, as shown in FIGS. 16(a) and 16(b), and only the light that has passed through other than the original is guided to the CCD elements 711 to 714. Accordingly, 5, CCD element 71. .about.714 photoelectrically converts t of one scanning line for each color, and outputs this signal in response to a clock pulse from a clock A' pulse oscillator 76.

The signals outputted from the CCD elements 711...714 are sent to amplifiers 81. . . 814, it is supplied to the computer 82 bits . . . 824. This is fine.

A/D converter 82. ...824 A, /D In response to the pulse from the pulse oscillator 87, the amplifier 81 . ...
Convert the signal from 8H to Φ and convert it to balance memory 851.
...supply to 854. Next, each buffer memory 83
1 . In this case, the buffer memory "Jl r 83" corresponds to the deviation Δt between the CCD elements 711+7'3 and 712°714.
3 delays the output of data.

The analog switches 84, . . . 844 convert the signals supplied from the buffer memories 831 . are separated into signals of each color and outputted to buffer memories 851...86<K. As a result, the buffer memories 851...854
By storing the signals for each color supplied from the analog switches 841 . . . 844 to the address indicated by the address counter 88, each color is stored in a different storage area.

The image signals for one scanning line read by the photoelectric conversion unit 13 are then supplied from the buffer memories 85, . . .
The light color signal of C) is supplied to the color conversion section 6i4. As a result, the color conversion portion 64 is converted to the image signal to be supplied to a color signal of the ink, converted it to a 9 -Ilo component, and a counter 69 in the manuscript size judgment unit 69 via a pass line 62.
1, the counter 91 counts the number of signal pinch dots supplied, and counts the number of dots for one scanning line. The count value of this counter 91 is compared by a comparator circuit 92. For example, when the count number is between a%b, it is determined to be size B4, when it is between C and d, it is determined to be size A4, and when the count value is between a% and b, it is determined to be size A4, The size is B5.

(However, a) b) a) d) e) f). The determination result of the document size determination section 68 is supplied to the main control section 61 via the pass line 62. In addition, Fig. 16(a),
Even if the originals are placed at different positions as in (b), it can be determined that both originals are of the same size.

Thereby, the main control unit 61 moves the scanner 11 to start scanning the original.

In other words, lighting runde 12. The original 0 is irradiated,
The reflected light is guided to CCD elements 711 . . . 714 via the light focusing optical fiber 14 . Accordingly, each of the CCD elements 711...714 photoelectrically converts the reflected light for one scanning line for each color, and converts this signal into a clock t.
The Z pulse oscillator 76 outputs it in response to a clock pulse from the oscillator 76. The signals output from the CCD elements 711...714 are passed through amplifiers 811...814 to A/
It is supplied to D converters 821...824. This is K
YoJ), A/D converter 82. ...824 is A/D
In response to the i4 pulse from the pulse oscillator 87, the amplifier 811
. . . A/D converts the signal from 814 and sends it to buffer memory 85 . ...Supplied to 854. Next, each buffer memory 83 [...834] is connected to the main controller 9.61.
Bladder evacuation signal R from.

The data is output in order from the oldest to the analog switches 841...844. In this case, C
CD element 71. ．． Disparity Δ between 713 and “2 + 714”
Buffer memory for time corresponding to trc, 83.・、83
3 delays the output of data. And Anna o/
'X switches 841...844 are A/l respectively)
) According to the pulse from the pulse oscillator 87, the signals supplied from the buffer memories 831...834 are separated into green (G), yellow (t), and cyan (C) color signals, and the buffer Output to memories 851...854. With this, buffer memory 851...85.4
The signals for each color supplied from the analog switches 841...844 are stored at the address indicated by the address counter 88, and each color is stored in a different storage area. □The image signal for one scanning line read by the photoelectric conversion unit 13 or the image signal supplied from the buffer memory 851...854:
At the beginning of lean, the yellow cap cyan (C) light i signal is supplied to the color converter 64. Accordingly, the color conversion unit 64 converts the supplied image signal into ink color signals, including a yellow component, a magenta component, and a cyan component.

Each of the signals is converted into a black component and supplied to the storage section 68 via the bus line 62. As a result, color signals of each ink for one scanning line are stored in the storage unit 68. Thereafter, the image information for each scanning line is converted into a color signal for each ink and stored in the storage unit 68.

In this way, when the color signals for each color for one page of the original are stored, the paper in the paper feed cassette 42 is selected according to the above-described document size determination result, and the paper is moved to the paper feed cassette by the paper feed roller 41. The paper P stored in 42 is 1
A sheet is taken out. The taken out paper P is sent to the registration rollers 43 and its leading edge is aligned, then transported by the registration rollers 43 toward the platen 3o, and wound around the platen 30 by the pressing rollers 44 and 45. becomes. Next, the paper P is conveyed by the platen 3o, and the thermal head 3'1 [i] reads out one page of the original (7) (-1-low component color signal is 1 ink IJyl?y34) from the printing section 68. yellow ink section 47
Thermal transfer is performed using Y. The paper P on which printing of the yellow component has been completed is sent onto the first guide plate 49 by the rotation of the platen 30. Then, the platen 30 is rotated in the opposite direction, and the paper P is transported in the opposite direction.

When this reverse feeding is completed, the paper P is sent onto the second guide plate 50.

Thereafter, by performing the same operation as the above-mentioned transfer of the yellow component, the original 1 read out from the storage unit 68 on the sheet P is transferred to the paper P.
Color signals for magenta, cyan, and black for a page are thermally transferred using ink portions corresponding to the color signals. Paper P printed in yellow, magenta, cyan, and black in this way
is guided to the paper discharge roller 53 by the platen 300 rotations and the second distribution gate 52, and is discharged onto the paper discharge tray 48 by the paper discharge roller 53, and the copying operation is completed.

In the above embodiment, a case has been described in which the size of the document is determined based on the count number in one scanning line, but the present invention is not limited to this, and the presence or absence of the document may be determined based on the count number. For example, at the end of copying, an LED array is operated, the number of dots of a predetermined color signal generated by the light is counted, the presence or absence of a document is determined according to the counting result, and the presence or absence of a document is determined according to the determination of the presence of a document. You can notify your residence. Also, I used an LED array as the light source,
This may be limited to a fluorescent light. Further, the light source may be set at any position corresponding to one scanning line of the document on the document cover.

In addition, although the explanation was given using a thermal transfer color copying machine as an example,
The present invention is not limited to this, and can be applied to other image forming apparatuses, such as an electrophotographic laser printer having a scanning means for scanning and reading a document.

〔Effect of the invention〕

\ As described in detail above, according to the present invention, it is possible to provide a reading device that can reliably detect the presence or absence of a document or the size of the document.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an external perspective view schematically showing the configuration of a thermal transfer color copying machine, and FIG. 2 is a schematic perspective view with a portion of FIG. 1 cut away. 3 is a sectional view of FIG. 1 for schematically explaining the configuration of the document scanning section, FIG. 4 is a plan view for explaining the state of illumination by the LED array on the document table, and FIG. 5 is a sectional view of FIG. 6 is a plan view schematically showing the structure of the scanner, FIG. 7 is a perspective view of FIG. 6, and FIG. 8 is an example of the arrangement of CCD elements. 9 is a plan view schematically showing the structure of the CCD element, FIG. 10 is a longitudinal side view schematically showing the structure of the image forming section, and FIG. 11 is a plan view schematically showing the structure of the image forming section. 12 is a plan view showing the structure of the thermal transfer ink ribbon; FIG. 13 is a block diagram schematically showing the control circuit; FIGS. 1 and 4 are block diagrams schematically showing the structure of the photoelectric conversion section; FIG. 15 is a diagram schematically showing the configuration of the document size determination section, and FIG. 16 is a diagram for explaining the relationship between the document and the document table and the photoelectric conversion signal in this relationship. 0... Original (object to be read), P... Paper, 7... Original table, 8... Original scanning unit, 10... Original cover, 1
No. Scanner, 12. Illumination lamp, 13. Photoelectric conversion unit, 14. Light focusing glass fiber, 15.
... Carriage, 16... Guide rail, 18... Scanning motor, 61... Main control section, 63... Scanner control section, 69... Document size determination section, 711-714.
...CCD element (charge coupled device), 72...Glint board, 73...LED array (light source), 74...Document cover opening/closing detector, 81-814...Amplifier, 8
21~824...N converter, 831~834・
・・Buffer memory, 84□～844・・Analog switch, 851～854・・Buffer memory, 86・
... Clock pulse, oscillator, 87... width/? pulse oscillator, 88...address counter, 9.1...counter, 92...comparison circuit. Applicant's agent Patent attorney Takehiko Suzue□ 4.4. '. 1 7 ・Figure 11Figure 12

Claims (4)

[Claims] (1) In a reading device that photoelectrically converts information on a document placed on a document table by scanning the document placed on a document table with a scanner including a photoelectric conversion element, the scanner is arranged with respect to the document table. A reading device characterized by comprising: a light source for one scanning line provided on the opposite side to the side where the original is being scanned; and a detection means for detecting the original according to the output of the photoelectric conversion element by light from the light source. Device. (2) The reading device according to item 1, wherein the detection means detects the dimensions of the document. (3) The detection means detects the presence or absence of a document.
The reading device according to claim 1. (4) The reading device according to claim 1, wherein the light source is attached to a document table cover.