JPH0453090Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image scanner that reads information such as characters and figures using an image sensor.

[Conventional technology]

An image scanner is used to cause a display device such as a personal computer to process a document displaying information such as characters and graphics into an image.

In this image scanner, a scanning window is provided on the document table, the document is placed face down on the document table, and an image sensor installed at the bottom of the document table is placed along the document. The so-called document fixing method, in which the document is sequentially scanned through a scanning window by moving the document, and the document fixing method, in which the document is held by wrapping it around a drum, for example, and the image sensor is moved in the axial direction of the drum in conjunction with the rotation of the drum. By moving the document, it is broadly classified into the so-called document movement method, in which information is read by helical scanning the document, and it is possible to increase the relative speed between the document and the image sensor.In other words, it is possible to increase the scanning speed of the image sensor. The latter document moving method is superior from the viewpoint of reducing the number of pixels of the image sensor.

[Problem that the invention attempts to solve]

By the way, in the case of the above-mentioned document moving type image scanner, it is necessary to wrap the document around the circumferential surface of the drum and hold it.As a conventional example for this purpose, a pair of presser plates are attached to a cylindrical metal drum. , one can hold both ends of the original between the holding plate and the circumferential surface of the drum, or one can fix one end of a transparent film body to a cylindrical metal drum and hold the original between the film body and the circumferential surface of the drum. Clamping devices are known.

However, with this document holding method, the document must be wrapped around a drum within the case body that forms the outer shell of the image scanner, so the task of wrapping the document is troublesome, especially as the diameter of the drum becomes smaller. In addition, since the drum is formed of a cylindrical body made of metal material, the mass of the drum is large, and an expensive and large motor must be used to rotate the drum. There was a problem.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an image scanner in which the problems of the prior art described above are solved, the weight of the drum can be reduced, and documents can be easily set.

[Means for solving problems]

The object of the present invention described above is to provide a drum that is rotatable about a rotation axis and that carries a document wound around its circumferential surface, and an image sensor disposed outside the circumferential surface of the drum. and scanning the image sensor in the axial direction of the drum,
In an image scanner that reads information such as characters and figures displayed on the document, a plurality of disc-shaped carriers are provided on the rotating shaft at predetermined intervals in the axial direction, and the circumference of these disc-shaped carriers is A lower film body and an upper film body are wound around the surface in a laminated state and one end of each is fixed to the disc-shaped carrier, and the original document is prepared by:
This is generally achieved by configuring the image sensor to scan the image sensor through the upper film body and between the upper film body and the lower film body.

[Effect]

According to the above means, a cylindrical drum can be formed by the plurality of disc-shaped carriers and the lower film body wound around the circumferential surfaces of these carriers, so that the weight of the drum can be reduced and the lower film body can be Since the original can be sandwiched between the upper film and the upper film when these two films are pulled out, the original can be easily set on the circumferential surface of the drum.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

First, a schematic configuration of an image scanner according to an embodiment of the present invention will be explained using FIGS. 1 to 3.

In these figures, 1 is a case body made of synthetic resin forming the outer shell of the image scanner, 2 is a cover made of transparent synthetic resin disposed to cover the upper surface of the case body 1, The case body 1 consists of an upper case 3 and a lower case 4, and the shaft portion 2 of the cover 2 is attached to the joint surface of these cases 3 and 4.
a is rotatably held.

A relatively large first opening 5 and a second opening 6 are arranged in parallel on the upper surface of the upper case 3,
Further, a small window hole 7 and a circular operation hole 8 are provided at one corner of the top surface.

On the other hand, a pair of side plates 9 are erected inside both side walls of the lower case 4, and between these side plates 9, a guide shaft 10 with a circular cross section, a drive shaft 11 with a square cross section, and a drum (to be described later) are installed. The rotating shafts 12 are supported parallel to each other. Further, a DC motor 13 is attached to the inner bottom of the lower case 4, and the rotational driving force of the motor 13 is transmitted to the rotating shaft 12 via a belt 14 and a first reduction gear train 15. The rotation of the rotary shaft 12 is transmitted to the drive shaft 11 via a second reduction gear train 16.

A carriage 17 is inserted and held in the guide shaft 10 so as to be able to reciprocate in the axial direction thereof, and a holder 19 containing an image sensor 18 is integrally attached to the side wall of the carriage 17. The image sensor 18 is composed of a light emitting element made of an LED, a light receiving element made of a phototransistor, a spherical lens, etc. (none of which are shown), and the light emitted from the LED is focused by the spherical lens, which will be described later. This is a well-known optical reading device used as a barcode scanner, etc., in which the reflected light enters a phototransistor when a document is read.

Further, an insertion hole 20a having a rectangular cross section is inserted into the drive shaft 11, and the insertion hole 20a is bored in the center of a worm 20.
7, and its both ends are regulated by both side walls of the recess. Therefore, when the worm 20 reciprocates in the axial direction of the drive shaft 10, the carriage 17 and holder 19 are also guided by the guide shaft 10 and reciprocate together with the worm 20.

A printed circuit board 21 is installed in one corner of the lower case 4.
A start switch 22 for starting the reading operation by the image sensor 18 and a stop switch 23 for stopping the reading operation by the image sensor 18 are mounted on the printed circuit board 21, respectively. ing. An operation button 24 is attached to the actuator of the start switch 22, and the operation button 24 protrudes outward from the window hole 7 of the upper case 3, and a button for operating the actuator of the stop switch 23 is attached to the side plate 9. An operating body 25 is provided (details of this operating body 25 will be described later).

The drum described above includes three synthetic resin disc-shaped carriers 26 fixed to the rotating shaft 12 at predetermined intervals, and a lower film that is wound around the circumferential surface of these disc-shaped carriers 26 to form a cylindrical surface. The drum 29 comprises a body 27 and an upper film body 28, and a document to be described later is held between the lower film body 27 and the upper film body 28 and carried on the drum 29. As described above, this drum 29 is rotated at a constant rate by the driving force of the motor 13, but can be rotated by manual operation of an operating knob 30 provided exposed on the side surface of the case body 1. . The details of the operation of this operating knob 30 will be described later, but the operating knob 30 is pivoted on a drive plate 32 that is rotatably supported on the side plate 9 while being biased by a coil spring 31. Shaft part 3
0a is held between the joint surfaces of the upper case 3 and the lower case 4.

A rack 33 extending parallel to the drive shaft 11 and a cylindrical drive rod 3 are provided on the back surface of the cover 2.
4 is installed vertically, and when the cover 2 is closed,
The rack 33 is engaged with the worm 20 through the second opening 6 of the upper case 3, and the drive rod 34 is engaged with the worm 20.
The operating body 25 is connected to the operating body 25 through the operating hole 7 of the upper case 3.
It is becoming more and more pressing. Further, a cam 35 is integrally formed on one side of the shaft portion 2a of the cover 2, and the cam 35 drives the drive plate 32 in conjunction with the opening/closing operation of the cover 2.

Next, the structure of the drum 29 is shown in FIGS. 4 and 5.
This will be explained in detail using figures.

A partially cut out flat surface 26a is formed on the circumferential surface of each of the disc-shaped carriers 26, and one end of each of the lower film body 27 and the upper film body 28 is bonded to these flat surfaces 26a as appropriate by heat-sealing or the like. It is fixed by means. In addition, disc-shaped carriers 2 located at both ends
A plurality of positioning protrusions 36 are provided at predetermined intervals on the circumferential surface of the carrier 6, and a locking protrusion 37 is provided on the flat surface 26a of the central disc-shaped carrier 26.
A plurality of sprocket holes 38 are bored in both side edges of both film bodies 27, 28 in correspondence with the positioning projections 36. The lower film body 27 and the upper film body 28 are rectangular with approximately the same size and are both made of transparent synthetic resin films, and a presser plate 39 having an elastic tongue piece 39a at the center is fixed to the other end of the upper film body 28. The elastic tongue piece 39a
can be engaged with and detached from the locking protrusion 37. Further, near the other end of the upper film 28, a band-shaped synchronization mark 40 made of a highly reflective material such as white or silver ink is printed and formed.
extends parallel to the rotation axis 12.

6 and 7 show the operation knob 30 described above.
This explains the power transmission system between the drum 29 and the drum 29.
FIG. 6 shows the cover 2 in a closed state, and FIG. 7 shows the cover 2 in an open state.

As shown in these figures, one support shaft 41 and two guide pins 42 are implanted in the side plate 9, and the drive plate 32 pivots on the side plate 9 about the support shaft 41. When the drive plate 32 is attached, a pair of elongated holes 32a formed in the drive plate 32 engage with the guide pin 42, thereby smoothly restricting its rotation. The drive plate 32 also has the operation knob 3.
0 shaft portion 30a is pivotally supported, and this shaft portion 30
A gear 43 fixed to the tip of the gear a and a gear 44 fixed to the rotating shaft 12 (this constitutes a part of the first reduction gear train 15 described above) face each other so as to be able to come into contact with and separate from each other. Furthermore, the coil spring 31 is stretched between the upper part of the drive plate 32 and the upper part of the side plate 9,
The drive plate 32 is urged upward by the elasticity of the coil spring 31, that is, in the direction in which both the gears 43 and 44 are separated. On the other hand, the cam 35 formed on the cover 2 has a circular arc portion 35a that is approximately equal in distance to the shaft portion 2a, and a shaft portion 2a that is shorter than the circular arc portion 35a.
The arcuate portion 35a has a linear portion 35b which has a short distance to the drive plate 3 when the cover 2 is opened.
2, and the straight portion 35b is in contact with the upper end of the cover 2.
When the lid is closed, it comes into contact with the upper end of the drive plate 32. Therefore, when the cover 2 is open, the drive plate 32 is urged downward by the arc portion 35a of the cam 35, and the gear 43 of the operating knob 30 and the gear 44 of the drum 29 mesh with each other.
In the closed state, the drive plate 32 is lifted by the spring force of the coil spring 31 to a position where it comes into contact with the linear portion 35b of the cam 35, and the meshing of both gears 43 and 44 is released.

Next, the configuration of the operating body 25 is shown in FIGS. 8 to 11.
This will be explained in detail using figures.

A long hole 45 extending in the vertical direction is bored in the center of the operating body 25, and an abutting protrusion 25a and a pin 25b are provided at both upper and lower ends in opposite directions. The operating body 25 is supported by a support shaft 46 installed in the side plate 9, and a coil spring 47 is stretched between the upper end of the support shaft 46 and the upper end of the side plate 9. The aforementioned stop switch 23 is disposed below the abutment protrusion 25a, and the drive rod 34 comes into contact with and leaves the upper surface of the abutment protrusion 25a as the cover 2 rotates. on the other hand,
The pin 25b is located near the stroke end of the above-mentioned carriage 17.
7 comes into contact with the pin 25b at its end of movement position, so that the operating body 25 rotates about the support shaft 46.

When the cover 2 is in the open state, the drive rod 34 separates from the contact projection 25a of the operating body 25 as shown in FIG. 9, so the operating body 25 is lifted by the spring force of the coil spring 47, and the stop switch is activated. 23 is not operated. On the other hand, when the cover 2 is closed, the abutment protrusion 25a is pressed by the drive rod 34 which passes through the operation hole 8 of the upper case 3 and descends as shown in FIG.
is inserted by the lower surface of the abutment protrusion 25a. In addition, when the carriage 17 is moved along the guide shaft 10 to its terminal position and comes into contact with the pin 25b in this state, the operating body 25 is moved counterclockwise in the figure with the support shaft 46 as the center, as shown in FIG. As a result, the stop switch 23 is released from being turned on by the contact projection 25a.

FIG. 12 is a schematic configuration diagram showing the circuit section of the above-mentioned image scanner. In the figure, 48 is a control section consisting of a flip-flop circuit, etc. On the input side of the control section 48 are the start switch 22 and stop switch 23. is connected. Further, 49 is a host computer, and three types of signals, ie, a status signal, a mark signal, and a data signal, are input to the host computer 49. Further, to the output side of the control section 48, the motor 13 is connected via a motor driver 50, and the LED 18a of the image sensor 18 is connected via an LED driver 51. Further, the phototransistor 18b of the image sensor 18 is connected via an amplifier 52 to first and second comparators 53 and 54, respectively. The first comparator 53 has a first reference voltage 55.
is connected, and by comparing this voltage with the voltage obtained from the phototransistor 18b,
The first comparator 53 inputs the aforementioned mark signal to the host computer 49. On the other hand, a second reference voltage 56 is connected to the second comparator 54, and by comparing this voltage with the voltage obtained from the phototransistor 18b, the second comparator 54
transmits the aforementioned data signal to the host computer 49.
Enter.

In such a circuit configuration, the stop switch 2
3 is in the off state, regardless of whether the start switch 22 is on or off, the control unit 48 inputs an "L" level signal to the motor driver 50 and the LED driver 51, and the motor 13 is activated by the signal. It stops and the LED 18a turns off. In this case, the control section 48 inputs an "L" level status signal to the host computer 49, and the host computer 49 detects from this signal that the image scanner is in an inactive state.

On the other hand, if the start switch 22 is turned on while the stop switch 23 is in the on state, the control section 48 sends an "H" level signal to the motor driver 5.
0 and the LED driver 51, the motor 13 rotates according to the signal, and the LED 18a
lights up. In this case, the control section 48 inputs an "H" level status signal to the host computer 49, and the host computer 49 detects from this signal that the image scanner is in an operating state.

Here, the operating principle of the image scanner is explained in the 13th section.
The explanation will be made mainly with reference to the drawings and FIG.

When the motor 13 rotates as described above, this driving force is transmitted to the drum 29 via the belt 14 and the first reduction gear train 15, and the drum 29 rotates at a constant speed. Further, the rotation of the drum 29 is transmitted to the drive shaft 11 via the second reduction gear train 16, and the worm 20, which rotates in conjunction with the drive shaft 11, engages with the rack 33 vertically disposed on the cover 2, so that the image The holder 19 containing the sensor 18 is the carriage 1
7 along the guide shaft 10.

In this way, when the drum 29 rotates at a constant speed and the image sensor 18 starts moving at a constant speed along the axial direction of the drum 29, the image sensor 18
scans the circumferential surface of the drum 29 in a spiral pattern, and sequentially scans in the direction of the arrow shown by the broken line in the developed view of the drum 29 shown in FIG. A document, which will be described later, is wound around the circumferential surface of the drum 29 (its effective reading area is indicated by the symbol S in FIG. The reflected light is received by the phototransistor 18b, so that the phototransistor 18b outputs the signal waveform shown in FIG. Output. In the figure, V ₁ is the first reference voltage,
V ₂ represents the second reference voltage, and
The mark signal described above is obtained by shaping the waveform as shown in FIG. 14B with V ₁ as the threshold value, and the data signal described above is obtained by shaping the waveform as shown in FIG. 14C with V ₂ as the threshold value. is obtained.

This mark signal is a signal obtained corresponding to the synchronization mark 40, and the first comparator 53 outputs an "H" level signal to the host computer 49 once per rotation of the drum 29, and the host computer The computer 49 can detect the rotational speed of the drum 29 by measuring the period T of the mark signal. The host computer 49 also controls the drum 2
9 reaches the constant speed number, the data signal is sampled at a constant sampling period from a certain time (corresponding to the end _S1 of the document from the synchronization mark 40) using this mark signal as a reference, thereby obtaining the desired signal. The image data at the resolution can be displayed on a display device (not shown).

The data signal is a binary signal of black and white read by the image sensor 18, and is sent from the second comparator 54 as an "H" or "L" level signal over the entire circumference of the drum 29. The data is output to the host computer 49, and as described above, the host computer 49 samples the data signal only within a necessary range based on the mark signal, so that information within the effective reading area S can be displayed.

Returning to FIG. 12 again, when the start switch 22 is turned on and the stop switch 23 is turned off, the control section 48 inputs an "L" level status signal to the host computer 49, and the host computer 49 receives the signal. Therefore, it is detected that the image scanner is in an inactive state. in this case,
As described above, the motor 13 is stopped and the LED 18a is turned off.

The configuration of the image scanner has been described above, and now the operation of the image scanner will be described.

First, as shown in Figure 15, cover 2 is
The lower film body 27 and the upper film body 28 are pulled out from the first opening 5 of the upper case 3. This operation is possible because the gear 43 of the operating knob 30 and the gear 44 of the drum 29 are in mesh with each other when the cover 2 is in the open state as described above. This is done by rotating the drum 29.

Next, the original 57 is inserted between the lower film body 27 and the upper film body 28 with its information side facing up, and the operating knob 30 is manually rotated in the opposite direction to the above, so that the lower film body 27 , the original 57 and the upper film body 28 are wound around the circumferential surface of each disc-shaped carrier 26. In this case, both film bodies 27 and 28 have their respective sprocket holes 38 aligned with the disc-shaped carrier 26.
The elastic tongues 39a of the presser plate 39 provided at the end of the upper film body 28 are then wound around the circumferential surface of each disc-shaped carrier 26 with high precision. The document 57 is held on the circumferential surface of the drum 29 by being hooked onto the locking protrusion 37 of the disc-shaped carrier 26 .

After setting the original 57 on the drum 29 in this manner, move the carriage 17 facing inside the second opening 6 of the upper case 3 along the guide shaft 10 with your fingers or the like, and move the holder 19 containing the image sensor 18. Align the leading edge with the reading start position on the document 57.

Thereafter, when the cover 2 is closed, the gear 43 of the operating knob 30 and the gear 44 of the drum 29 are disengaged by the cam 35 as described above, and the rack 33 vertically disposed on the back surface of the cover 2 is released. The teeth engage with the worm 20, which is moved to a predetermined position in conjunction with the carriage 17. Further, due to the closing operation of the cover 2, the drive rod 34 vertically disposed on the cover 2 is moved to the operating body 2, as shown in FIG.
Since the actuator of the stop switch 23 is pressed down via the switch 5, the stop switch 23 is turned on in the circuit shown in FIG.

In this state, when the operation button 24 is pressed and the start switch 22 is turned on, the host computer 49 detects that the image scanner is in the operating state based on the status signal from the control unit 48, as described above. , the motor 13 starts rotating, and the LED 18a of the image sensor 18
lights up.

When the motor 13 rotates, its driving force is transmitted to the drum 2 via the belt 14 and the first reduction gear train 15.
9, and the drum 29 is rotated at a constant speed.
In this case, as described above, the gear 44 of the drum 29
Since the gear 43 of the operating knob 30 is not in mesh with the operating knob 30, the operating knob 30 exposed outside the case body 1 does not rotate in conjunction with the drum 29. Even if the knob 30 is touched by a finger or the like, the rotation of the drum 29 is not disturbed thereby, and an image scanner that is excellent in terms of both safety and reading reliability is realized. Further, in this embodiment, the drum 29 includes a plurality of disc-shaped carriers 26 and a lower film body 27.
Since the weight of the drum 29 is reduced by composing the drum 29 with
Coupled with the fact that the power transmission system between the drum 29 and the operating knob 30 is cut off, the inertial mass during constant rotation of the drum 29 is significantly reduced.

The rotation of the drum 29 is controlled by the second reduction gear train 1
6 to the drive shaft 11, and the drive shaft 11
When the worm 20 rotates at a constant rate, the worm 20 rotates thereby and the rack 33 engages with the worm 20, thereby moving the worm 20 along the drive shaft 11 in the direction of arrow A in FIG. This worm 20 has a carriage 17
Since the concave portions 17a of the worm 20 are engaged so as to hold both ends of the worm 20, the carriage 17 also moves in the direction of arrow A along the guide shaft 10 in conjunction with the worm 20, and the carriage 17 is integrated with the worm 20. Image sensor 18 built into holder 19
(LED18a and phototransistor 18b)
A document 57 wound around a continuously rotating drum 29 is helically scanned through a transparent upper film body 28.

Since the helical scan of the document 57 by the image sensor 18 has been described above, a detailed explanation will be omitted here, but the image sensor 18
sequentially scans the peripheral surface of the drum 29 starting from the reading start position, and based on the mark signal and data signal obtained from the image sensor 18, the host computer 49 displays information on the document 57 on a display device (not shown). do.

In this way, the image sensor 18 performs the information reading operation, and when the carriage 17 reaches just before its movement end position, the side surface of the carriage 17 comes into contact with the pin 25a of the operating body 25, and the carriage 17 Further, when the movement end position is reached, the operating body 25 is rotated as shown in FIG. 11. Then, the stop switch 2, which had been pressed by the operating body 25 and kept in the on state,
3 is turned off, thereby stopping the motor 13 and turning off the LED 18a of the image sensor 18.
The host computer 49 also turns off the control unit 48.
The image sensor 18 is activated by the status signal from
The end of the reading operation is detected.

Furthermore, if the cover 2 is opened during the information reading operation by the image sensor 18,
As shown in FIG. 9, the driving rod 34 moves away from the operating body 25, and the operating body 25 is thereby pulled back by the coil spring 47.
The spring force of the stop switch 23 causes it to rise.
Therefore, in the same manner as when the reading operation is completed as described above, the image scanner is put into a non-operating state, and the reading operation can be interrupted by opening the cover 2.

In the above-described embodiment, the drum 29 is composed of a plurality of disc-shaped carriers 26 and the lower film body 27 that is wound around the circumferential surfaces of these carriers to form a cylindrical surface, so that the weight of the drum 29 can be minimized. It is possible to realize the high-speed rotation of the drum required for high-speed reading. When setting the original 57 on the drum 29, all you have to do is pull out the lower film body 27 and the upper film body 28 from the case body 1, insert the original 57 between them, and then rotate the drum 29. Since the original 57 can be wrapped around the peripheral surface of the drum 29, even if the original 57 is small like a postcard, it can be easily set. Further, sprocket holes 38 formed in each of the upper film body 28 and the lower film body 27 are regulated by positioning protrusions 36 provided on the disc-shaped carrier 26, so that misalignment on the circumferential surface of each disc-shaped carrier 26 is prevented. Since both the film bodies 27 and 28 and the original 57 are wound without any distortion, both the film bodies 27 and 28 and the original 57 are accurately positioned with respect to the cylindrical surface of the original, thereby preventing misalignment of the original 57 and deformation of both the film bodies 27 and 28. I can do it.

In addition, in the above embodiment, three disc-shaped carriers 2
Although the number of these disc-shaped carriers 26 can be changed as appropriate depending on the length required for the drum 27 and the thickness dimension of each disc-shaped carrier 26, the point is that both film bodies 26 are used. It is sufficient if there are two or more 27 and 28 so that a cylindrical surface can be formed.

Further, the lower film body 27 does not need to be made of a transparent material as in the above embodiment, but may be a colored film as long as it is made of a material with sufficiently lower reflection than the synchronization mark 40.

[Effect of idea]

As explained above, according to the present invention, since the drum is constituted by a plurality of disc-shaped carriers and the lower film body wound around the circumferential surfaces of these carriers, the weight of the drum can be reduced as much as possible, and it After sandwiching the original between the upper film body and the lower film body,
It is possible to provide an image scanner in which the document can be wound around a disc-shaped carrier together with both film bodies, and is suitable for high-speed reading and in which the document can be easily set.

[Brief description of the drawings]

The figures all relate to one embodiment of the present invention; Fig. 1 is an exploded perspective view of the image scanner, Fig. 2 is a sectional view of the image scanner, and Fig. 3 is an image with the upper case and cover removed. A plan view of the scanner, Figures 4 and 5 are perspective views of the drum, Figures 6 and 7 are explanatory diagrams showing the power transmission system between the operating knob and the drum, and Figure 8 is a diagram of the operating body and stop switch. FIGS. 9, 10, and 11 are perspective views showing the relationship, and FIGS. 12 and 11 are explanatory views showing the operation of the operating body.
The figure shows the circuit configuration of the image scanner, FIG. 13 is a developed view of the drum, FIG. 14 is a diagram of waveforms obtained from the image sensor, and FIG. 15 is a perspective view showing the document set state. . DESCRIPTION OF SYMBOLS 1...Case body, 2...Cover, 2a...Axis diagram, 3...Upper case, 4...Lower case, 5...First opening, 6...Second opening, 7...Window hole , 8...
...Operation hole, 9...Side plate, 10...Guide shaft, 11...Drive shaft, 12...Rotation shaft, 13...
Motor, 14... Belt, 15... First reduction gear train, 16... Second reduction gear train, 17... Carriage, 17a... Recess, 18... Image sensor, 18a... LED, 18b... ...Phototransistor, 19...Holder, 20...Worm, 2
0a...Insertion hole, 21...Printed circuit board, 22...
...Start switch, 23...Stop switch, 24...Operation button, 25...Operation body, 25a...
...Abutting protrusion, 25b...pin, 26...disc-shaped carrier, 26a...flat surface, 27...lower film body,
28...Top film body, 29...Drum, 30...
...Operation knob, 30a...Shaft, 31...Coil spring, 32...Drive plate, 32a...Long hole, 33...
...Rack, 34...Drive rod, 35...Cam, 35
a... Arc part, 35b... Straight line part, 36... Positioning protrusion, 37... Locking protrusion, 38... Sprocket hole, 39... Holding plate, 40... Synchronization mark, 41... Support shaft, 42...Guide pin, 43,
44...Gear, 45...Elongated hole, 46...Spindle, 4
7...Coil spring, 48...Control unit, 49...Host computer, 50...Motor driver, 5
1...LED driver, 52...amplifier, 53...
...First comparator, 54... Second comparator, 55...
...First reference voltage, 56...Second reference voltage, 5
7...Manuscript.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A drum that is rotatable around a rotating shaft and that carries a manuscript wound around its circumferential surface, and an image disposed outside the circumferential surface of the drum. In an image scanner that reads information such as characters and figures displayed on the document by scanning the image sensor in the axial direction of the drum, A plurality of disc-shaped carriers are provided with an interval of The manuscript is
An image scanner characterized in that it is configured to be sandwiched between an upper film body and a lower film body, and to be scanned by the image sensor via the upper film body. (2) In the utility model registration claim described in paragraph (1), positioning holes are formed on both widthwise edges of the upper and lower film bodies, and the positioning holes are inserted into the circumferential surface of the disc-shaped carrier. An image scanner characterized in that it is provided with a positioning protrusion.