JPH0240686A - Overhead projector - Google Patents

Abstract

PURPOSE:To perform the creation of transparent original sheets and the transfer setting of the transparent original sheets at the same time and to project an optional image by setting transparent sheets with plural pages on a device previously, transferring a developed image of an original to the sheets, and carrying them out onto an original platen automatically after the transfer. CONSTITUTION:The original 24 is conveyed to a read position by the original feed roller 32 of the overhead projector and detected by an image sensor 40. At this time, a scanning roller 13 is rotated through the operation of an operation part 64 to press a transparent original sheet 45' on a transparent belt 15 by a projection member 16, and the sheet 15 moves together with the belt 15 and falls on a stacker 63 by gravitation. Further, the projection member 16 is conveyed to and stopped at the position where it contacts the transparent sheet 24 by the continuous driving of a pulse motor after printing. Then a hopper roller 25 and the roller 32 are rotated slightly after the pulse motor rotates and a light source is turned on through an illumination part simultaneously with the feeding of the original 24 to the read position.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a method for displaying characters and images on a document table consisting of a Fresnel lens.
An overhead projector that carries a transparent original sheet on which an image such as a symbol 1 figure is written, irradiates the image of the transparent original sheet from above or below, and projects this reflected light or transmitted light onto a screen via a projection lens and a mirror. (hereinafter referred to as OHP).

[Conventional technology]

In the first conventional example of this type of 0) (P), a transparent original sheet placed on an original platen made of a Fresnel lens is irradiated from below, and a transparent image of this transparent original sheet is projected above the upper surface of the original platen. A transmissive type that projects onto a screen through a placed projection lens and reflective mirror, and a transparent original sheet placed on a similar document tray is irradiated from above, and the reflected image of the transparent document sheet is projected onto the top of the document tray. A reflective type is known that projects images onto a screen through a projection lens and reflective mirror placed above, and is used in schools and various explanation halls.

In either case, in use, an operator manually places a transparent original sheet prepared in advance on a document mounting stand made of a Fresnel lens and projects the image onto the screen as described above.

Furthermore, as a second conventional example, Japanese Patent Application Laid-Open No. 59-20103
There is a technique disclosed in No. 3.

This is an existing copying device combined with an OHP, which is equipped with a reflective member and a Fresnel lens on the back of the document cover that covers the document table, and a removable column on the side of the copying device. Attachment: An OHP head consisting of an illumination lamp, projection lens, and reflection mirror is attached above the support.

With the above configuration, when used as an OHP, a transparent original sheet is placed on the upper surface of the original cover, irradiation is performed from above with an illumination lamp, and a reflected image is projected onto a screen through a projection lens and a reflection mirror.

When using it as a copying device, the whole column is 0)
(Tilt the P head unit to either the left or right side, lift the document cover, place the document on the document table, cover it with the document cover, and copy using a known copying technique.

Then, by applying the copying device of the apparatus disclosed in Japanese Patent Application Laid-Open No. 59-201033 mentioned above to create a transparent original sheet, an attempt was made to solve the troublesome task of creating a transparent original sheet.

[Problem to be solved by the invention]

However, according to the first conventional technology having the above-mentioned configuration,
For example, a transparent original sheet must be created in advance by hand or by copying, which not only makes it difficult to directly project the original manually, but also requires the preparation of a copying device, which complicates the equipment involved in projection.

In addition, when conducting various briefing sessions, when changing the projected image, the operator must manually replace each transparent original sheet one by one, and during this time, there is a problem that the explanation must be temporarily interrupted. there were.

Furthermore, when a previously projected original is desired to be viewed again, it is necessary to search for a specific one from among a large number of transparent original sheets, which causes an interruption in the explanation, which greatly impedes the overall progress.

Furthermore, according to the second prior art, it is necessary to move the OHP head section in order to switch between copying and projection.
The operability is poor and the problem has not been fully resolved.

In view of the above problems, the present invention provides a configuration that simultaneously creates a transparent original sheet and sets the transparent original sheet for projection, thereby allowing the operator to project any image without interrupting the explanation. The purpose is to provide an OHP that is possible.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a mechanism for setting a plurality of pages of transparent sheets in an apparatus in advance, a mechanism for transferring an image of an original document onto the transparent sheet, and a mechanism for automatically placing the image on a document table after transfer. A mechanism will be provided to carry out the work.

That is, in the present invention, a transparent original sheet on which images such as characters, symbols, and figures are written is placed on an original table consisting of a Fresnel lens, and the image of the transparent original sheet is irradiated from above or below, and this reflected light or transmitted light is emitted. An overhead projector that projects light onto a screen via a projection lens and mirror installed above the document table includes a document feeding unit that sends the original document to a reading position, and an image of the original document that is optically read at the reading position. an image reading means that converts the image into an electrical signal, a thermal head prints the image read by the image reading means on a transparent sheet to create a transparent original sheet, and the created transparent original sheet is carried onto the original document mounting table. A printing section is provided for printing.

Then, the original document is sent to a reading position by the original document feeding section, the image of the original document is read by the image reading means, and this image is printed on a transparent sheet in the printing section, and the transparent sheet is placed on the document placing table. The present invention is characterized in that the original sheet is carried out, and the image on the transparent original sheet that has arrived on the original table is projected onto a screen using reflected light or transmitted light.

[Function] According to the above configuration, when it is desired to project an image of an original document, the present invention sends the original document to the reading position by the document feeding section, optically reads the image on the original document by the image reading means, and displays this image. is printed on a transparent sheet by a printing means.

Thereafter, the transparent sheet on which the image has been printed is guided from the printing section onto the document table, and the image can be projected onto the screen using reflected light or transmitted light.

〔Example〕

Examples will be described below with reference to the drawings.

Figure 1 is a sectional side view of a first embodiment of the present invention, and Figure 2 is a partially cut away perspective view of the same, which is of a reflective type.

First, in FIG. 2, reference numeral 1 indicates a housing of the apparatus, and reference numeral 2 denotes a document mounting table provided on the upper surface of the housing 1. The document placing table Iy2 includes a Fresnel lens 3 and a reflective member 4.

Reference numeral 5 denotes a column fixed to the side surface of the housing 1 with screws and nuts (not shown), 6 a projection lens housing secured to the column 5 with screws 7a, and 8 similarly attached to the top of the projection lens housing 6. These are reflection mirrors that are locked with screws 7b, and the projection lens housing 6 and reflection mirror 8 can be freely adjusted in size by changing the distance from the original table 2 by selecting the locking position with the pillar 5. You can set the sheath projection position.

As shown in FIG. 1, the projection lens housing 6 houses a projection lens 10 supported by a lens holder 9, a light source 11, and a light source reflection plate 12.

In FIG. 1, reference numerals 13 and 14 refer to running rollers 15 that are rotatably arranged parallel to both ends of the document table 2;
is an endless transparent belt that is wrapped around the running rollers 13 and 14 and passed over the document table.

FIG. 3 is a perspective view of essential parts showing the structure of the transparent belt 15. As shown in FIG.

In the figure, reference numeral 16 denotes a protruding member formed vertically on the transparent belt 15, and when a transparent original sheet is supplied from the printing section, which will be described later, it comes into contact with the leading edge of the transparent original sheet to regulate the position of the transparent original sheet. be. The protruding members 16 are constructed by tearing off a part of the transparent belt 15 and bending it at right angles, and are provided at two locations at equal intervals in the direction of arrow a (FIG. 1) indicating the feeding direction.

17 is a page mark printed or pasted on the transparent belt 15 for page management;
Similarly to the projection member 16, 7 also moves in the direction of the arrow a indicating the feeding direction (
They are provided at two locations at equal intervals as shown in Figure 1).

In FIG. 2, reference numeral 18 is a pulse motor fixed to a frame (not shown) and capable of forward and reverse rotation.
A motor gear 19 is directly connected to the shaft of the driving roller 13 and meshes with a driving gear 20 that is directly connected to the shaft of the driving roller 13 to transmit the rotation of the pulse motor 18 to the driving rollers 13 and 14.

That is, although not shown, tension is applied to the running rollers 13 and 14 in the direction of separating them from each other, and the transparent belt 15
, so when the pulse motor 18 is driven to rotate and the traveling rollers 13 rotate, each traveling roller 13,1
4 and the transparent belt 15, the transparent belt 1
5 is in the direction of arrow a (
It can run in the forward direction) or in the direction of the arrow (return direction).

Returning to FIG. 1, reference numeral 21 denotes a page mark sensor provided at a predetermined position below the passing line of the page mark 17 in order to read the page mark 17 on the transparent belt 15.

Reference numeral 22 denotes a hopper unit that sends out an original document for the purpose of image reading, and the configuration of this hopper unit 22 will be described below.

23 is a hopper in which a plurality of original documents 24 are set; 25 is a hopper roller that feeds the original documents 24 from the hopper 23 to a reading position; 26 is a separating piece that contacts the center of the hopper roller 25; and 27 is a hopper roller that moves the separating piece 26 25 is a pressure piece that presses the pressure piece 27; 29 is a compression coil spring that presses the pressure piece 27; 29 is the original document 24;
This is a paper detection sensor that detects separation and feeding of paper.

30.31 is a document guide that guides the original document 24 to the reading position; 32 is a feed roller that is rotatably attached along the document guide 31; and 33.34 is a feed roller that is rotatably mounted in pressure contact with the feed roller 32. These are guide rollers arranged opposite to each other.

It is assumed that the document guide 31 is made of a transparent material that allows light to pass through, or has a cutout that allows light to pass through by an amount equal to the reading width of the original document.

In FIG. 2, 35 is a hopper gear fixed to one end of the shaft of the hopper roller 25, 36 is a feed gear fixed to one end of the shaft of the feed roller 32, 37 is a motor that rotationally drives the hopper roller 25 and the feed roller 32, and 38 is a motor that rotationally drives the hopper roller 25 and the feed roller 32. The motor 3
7, and the motor gear 38 meshes with the hopper gear 35 and the feed gear 36.

Reference numeral 39 denotes a stacker that stacks and stores the discharged original documents 24.

The operation of the hopper unit 22 is as follows.

First, drive the motor 37 and move the motor gear 38 to the arrow C.
When the hopper roller 25 is rotated in the direction of the arrow d, the feed roller 32 is rotated in the direction of the arrow e.

The plurality of original documents 24 stored in the hopper 23 collide with the hopper roller 25 due to gravity, so when the motor 37 is driven and the hopper roller 25 rotates in the direction of arrow G, the topmost original document 24 is moved between the hopper roller 25 and the separation piece 26. sent into the gap.

When the motor 37 is further driven, the fed original document 2
The leading edge of the document 4 is guided by the document guides 30 and 31, reaches the feed roller 32, is further sent in the direction of arrow e by the guide roller 33, and is further discharged to the stacker 39 by the guide roller 34.

The above is the configuration of the document feeding section that sends the original document to the reading position.

40 is an image sensor that reads the image of the original document 24;
41 is a condensing lens, 42 is a light source, 43 is a reflective material,
These optical system means emit light R1 from the light source 42 through the document guide 31 and reflect the reflected light R1 at the reading position.
2 is positioned so that the light reaches the image sensor 40 after being focused by the condenser lens 41.

The above is the configuration of the image reading means that optically reads the image of the original document at the reading position and converts it into an electrical signal.

Reference numeral 44 denotes a printing unit that is detachably attached to the housing 1, and the details of its configuration will be explained below.

45 is a continuous unprinted transparent sheet made of polyester film or the like, and 46 is a sheet roll around which the transparent sheet 45 is wound. The transparent sheet 45 indicates an unprinted transparent original sheet.

47 is a thermal head that makes the transparent sheet 45 cloudy and prints images such as letters and figures, and 48 is a platen roller that faces the thermal head 47 with the transparent sheet 45 in between.

49 is a motor that rotationally drives the platen roller 48;
0 is the motor gear of the 8 motor, 51 is the motor gear 50
The platen gear meshed with the platen gear, 52 is the thermal head 47
This is a compression coil spring that presses the platen roller 48 against the platen roller 48. This pressing force causes friction between the transparent sheet 45 and the platen roller 48, and the rotation of the platen roller 48 causes the transparent sheet 45 to be sequentially moved from the sheet roll 46 in the direction of the arrow f. At the same time, printing is performed by the thermal head 47.

Reference numeral 53 denotes a cutter that cuts the transparent sheet 45 fed out and printed as described above into a single sheet;
3 is composed of a fixed blade 53a and a rotary blade 53b.

That is, as shown in FIG. 2, the fixed blade 53a is fixed to the frame of the printing unit 44, and the rotary blade 53b is rotatably attached around a shaft 54, and a gear 55 is directly connected to this shaft 54. has been done. The gear 55 meshes with a gear 57 fixed to the shaft of a motor 56 that rotates in forward and reverse directions. As a result, the transparent sheet 45 can be cut by rotating the rotary blade 53b in the direction of the arrow g, and after cutting, the rotary blade 53b
3b can be rotated in the opposite direction of arrow g and returned to its original position.

A decurling plate 58 removes curls from the transparent sheet 45 wound around the sheet roll 46, and the decurling plate 58 is pulled toward the sheet roll 46 by a tension coil spring 59.

Reference numeral 60 denotes a cover of the printing unit that can be opened in the direction of the arrow around the fulcrum 61. By opening the cover 60, the sheet roll 46 can be easily replaced.

The above is the configuration of the printing section which prints the image read by the image reading means on a transparent sheet using a printing press to create a transparent original sheet, and transports the created transparent original sheet onto the original document mounting table.

62 is a sheet ejection port provided horizontally on the document table 2;
A stacker 63 is connected to the sheet discharge port 62 and stacks the discharged transparent original sheets 45'.

Reference numeral 64 denotes an operation section equipped with various input keys;
4, there are arranged a power on key, an off key, a feed key and a return key for the transparent belt 15, a transparent original creation key for instructing the creation of a transparent original, an on key and an off key for the projection light source, etc.

FIG. 4 is a block diagram showing the control system of this embodiment. In the figure, 1.65 is a control circuit section that controls the entire apparatus, and this control circuit section 65 includes an operation section 64, a page mark sensor 21. Based on the signal from the paper detection sensor 29, the image data output section 66, A/D conversion section 67, and print control section 681
Lighting part A701 Lighting part B71. Controls the motor drive section 72.

The image data output unit 66 converts the reflected light R1 from the light source 42 at the reading position and the reflected light R2 that reaches the image sensor 40 into electrical signals, assembles the electrical signals according to a predetermined method, and outputs the signals to the A/D. The converter 67 converts the analog signal into a digital signal and outputs it to the print controller 68.

The print control section 68 outputs the data from the A/D conversion section 67 to the thermal head 47 as a print signal. The motor drive section 72 is a pulse motor 18. The lighting section A70 that drives the motors 38, 49, and 56 turns on and off the projection light a11, and the lighting section B71 turns on and off the reading light tX49.

Further, direct current is supplied to each of the above sections from a power source 73. This power source 73 rectifies 100 square meters of alternating current.

Next, the operation of the apparatus having the above configuration will be explained.

<Transparent Original Creation> FIGS. 5(a), 5(b), and 5(C) are side sectional views showing the operation of this embodiment.

When the transparent original creation key of the operation section 64 is pressed, the pulse motor 18 is driven via the motor drive section 72 to rotate the traveling roller 13 in the direction of arrow i.

Thereby, the transparent belt 15 runs in the direction of arrow a.

At this time, if there is a transparent original sheet 45' on the transparent belt 15, the transparent original sheet 45' is placed on the protruding member 16 of the transparent belt 15 and moves together with the transparent belt 15, as shown in FIG. 5(a). As shown, it falls and is stored in the stacker 63 under its own weight.

The pulse motor 18 continues to drive in the same direction, moving the projection member 16 to the contact position with the transparent sheet 24 after printing is completed (
It stops when it is brought to the position shown in Figure 5(b).

The drive control of the pulse motor 18 is performed by counting the pulses of the pulse motor 18 and by counting the pulses of the pulse motor 18.
This is done by detecting 7.

On the other hand, in parallel with this, after a short delay after the pulse motor 18 starts rotating, the motor 37 is driven to rotate the hopper roller 25 and the feed roller 32, and the original document 24 in the hopper 23 is sent to the reading position. At the same time, the light source 42 is turned on via the lighting section B71.

The timing for starting the reading operation is determined by detecting the leading edge of the original document 24 with the paper detection sensor 29, determining how much further the motor 37 must be driven from this point until the leading edge of the original document 24 reaches the reading position, and determining the timing. The reading operation is started after the motor 37 is driven.

Original document 2 that has reached the image sensor 40 from the reading position
The image No. 4 is converted into an electric signal as one line in the horizontal direction, and the screen is configured as an electric signal in the vertical direction synchronized with the rotation speed of the feed roller 32, that is, the feed speed of the original document 24, The image data output unit 66 outputs the image data to the A/D conversion unit 67. The signal converted from an analog signal to a digital signal by the A/D converter 67 is input to the print controller 6, where it is converted into a signal for driving the thermal head 47 and output to the thermal head 47.

The control circuit section 65 controls the motor drive section 72 according to this signal.
The motor 49 is driven through the platen roller 48 to rotate the platen roller 48 in the direction of the arrow j, and the transparent sheet 45 is sent out from the sheet roll 46 in the direction of the arrow f while the thermal head 5 is rotated.
2, the transparent sheet 45 is made cloudy and printing is executed.

In the hopper unit 22, when the end of the original document 24 reaches the reading position, the motors 37 and 49 are stopped.
Finish reading and printing operations.

The arrival of the end of the original document 24 is determined by detecting the gap between the end of the original document 24 and the leading edge of the next original document 24 using the paper detection sensor 29 .

After printing is completed, the transparent sheet 45 is carried out by one page, and its leading end abuts against the projection member 16 of the transparent belt 15, as shown in FIG.

Here, the motor 56 is driven via the motor drive unit 72 to rotate the rotary blade 53b in the direction of arrow g to cut the printed transparent sheet 45. This cut printed transparent sheet 45 becomes a transparent original sheet 45'.

Note that the motor 56 rotates in the reverse direction to return the rotary blade 53b to its original position, and then stops.

After cutting, the motor drive section 72 reversely rotates the pulse motor 18 and rotates the running roller 13 in the direction of the arrow to run the transparent belt 15 in the direction of the arrow. The transparent original sheet 45 is attached to the transparent belt 1 due to contact friction with the transparent belt 15.
5 in the direction indicated by the arrow, and when the transparent belt 15 reaches the positional relationship shown in FIG. 5(C), the pulse motor 18 is stopped to stop the transparent belt 15 from running.

At this time, the leading edge of the next original document 24 is in front of the reading position, in preparation for the instruction to create the next transparent document.

<Projection> When the light source on key is input with the transparent original sheet 45' printed with the desired image set on the original platen 2, the irradiated light R3 from the light source 11 hits the reflective member 4 in this state. The reflected light R4 passes through the Fresnel lens 3.
It passes through the transparent belt 15 and the transparent original sheet 45', and then passes through the projection lens 10° reflection mirror 8 to the screen 7.
4, the image printed on the transparent original sheet 45' is projected onto the screen 74. At this time, the light is reflected in the cloudy parts of the transparent original sheet 45 and is not transmitted, and is projected as black on the screen, while other parts are transmitted and projected as white.

As described above, the projection mechanism is the same as before.

The above is the operation of the first embodiment.

Star I disaster Ueda FIG. 6 is a side sectional view showing a second embodiment of the invention.

While the first embodiment projects the image on the transparent original sheet onto the screen using reflected light, the second embodiment is a transmission type that has a light source inside the main body and projects the image on the transparent original sheet onto the screen using transmitted light. belongs to.

Further, in the second embodiment, a long contact type image sensor 4
Use 0'.

In FIG. 12, the irradiation light R5 irradiated from the light B11'
is Fresnel lens 3. After passing through the transparent belt 15 and the transparent original sheet 45', the transmitted light R6 is focused by the Fresnel lens 3 onto the center of the projection lens 10, and then projected onto the screen 74 by the reflection mirror 8.

Fig. 7 is a sectional side view of a main part showing a third embodiment of the present invention.

1st. While the second embodiment uses a continuous transparent sheet 45, the third embodiment uses a cut sheet type transparent sheet 75.

In the figure, 76 is a printing unit, and 77 is a hopper in which a plurality of unprinted transparent sheets 75 are set.

78 is a hopper roller that is driven by a drive source (not shown) to feed out the transparent sheet 75 from the hopper 77; 79 is a leaf spring that presses the transparent sheet 75 set in the hopper 77 against the hopper roller 78; and 80 is a plate spring that makes the transparent sheet 75 cloudy. A thermal head 81 prints images such as characters 5 and figures, and 81 is connected to the thermal head 80 with a transparent sheet 75 in between.
This is the platen roller facing the platen roller.

82 is the motor of the platen roller 81, 83 is the motor gear of the Si motor, 84 is the platen gear meshed with the 84 motor gear 83, and 85 is a compression coil spring that presses the thermal head 80 against the platen roller 81. Friction occurs between the sheet 75 and the platen roller 81, and the rotation of the platen roller 81 causes the transparent sheet 75 to be fed in the direction of arrow f, while the thermal head 80
Printing is performed.

This printed transparent sheet 75 becomes a transparent original sheet 75'.

The transparent sheet 75 is fed out by controlling the drive of the motor 82 and the hopper roller 78. First, hopper roller 78
When the transparent sheet 75 is fed out one sheet at a time and has been fed by a certain amount to a printable distance, the driving of the hopper roller 78 is stopped and the motor 82 is then started.

〔Effect of the invention〕

As described in detail above, according to the present invention, an overhead projector includes a document feeding section that sends an original document to a reading position, and an image reader that optically reads an image of the original document at the reading position and converts it into an electrical signal. and a printing section for printing an image read by the image reading means on a transparent sheet using a thermal head to create a transparent original sheet, and transporting the created transparent original sheet onto the original document mounting table. The original document is sent to a reading position by the document feeding section, the image of the original document is read by the image reading means, this image is printed on a transparent sheet in the printing section, and the transparent document sheet is carried out onto the document placing table. Since the image on the transparent original sheet that has arrived on the original table is projected onto the screen using reflected light or transmitted light, multiple pages of transparent sheets are set in the device in advance, and the original It is possible to transfer an image on a document and automatically transport it onto the document table after the transfer.

This makes it possible to create a transparent original sheet and set the projection of the transparent original sheet at the same time, and has the effect of providing an OHP that allows the operator to project any image without interrupting the explanation. be.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a first embodiment of the present invention, FIG. 2 is a partially cutaway perspective view of the same embodiment, and FIG. 3 is a perspective view showing the structure of a transparent belt of the same embodiment. 4 is a circuit block diagram of the same embodiment, FIGS. 5(a), (b), and (C) are side sectional views showing the operation of the same embodiment, and FIG. 6 is a circuit block diagram of the second embodiment of the present invention. FIG. 7 is a side sectional view of a main part showing a third embodiment of the present invention. 2...Original table 3...Fresnel lens 11...Light source 13.14...Travel roller 15...Transparent belt projection member Pulse motor hopper unit Printing unit Transparent sheet thermal head Platen roller Cutter Stacker special Applicant: Oki Electric Industry Co., Ltd. Takashi Kanakura, Patent Attorney, University of Science, Perspective view showing the structure of a transparent belt Full sectional view of main parts of the third embodiment

Claims (1)

[Claims] 1. Characters, symbols,
A transparent original sheet with an image such as a figure written on it is placed, the image on the transparent original sheet is irradiated from the top or bottom, and the reflected or transmitted light is projected onto the screen via a projection lens and mirror installed above the original table. An overhead projector for projecting images on a computer, comprising: a document feeding unit that sends an original document to a reading position; an image reading unit that optically reads an image of the original document at the reading position and converts it into an electrical signal; and an image read by the image reading unit. A printing section is provided for printing an image on a transparent sheet using a thermal head to create a transparent original sheet, transporting the created transparent original sheet onto the document mounting table, and moving the original document to a reading position using the original document feeding section. The image of the original document is read by the image reading means, and this image is printed on a transparent sheet in the printing section, and the transparent document sheet is conveyed onto the document mounting table. An overhead projector that projects an image on a transparent original sheet onto a screen using reflected light or transmitted light. 2. A running roller arranged parallel to the document placement table at a predetermined interval, a drive source that rotates the running roller in forward and reverse directions, an endless transparent belt wrapped around the running roller, and the above-mentioned. a protruding member formed to protrude vertically on the transparent belt and abut against the leading edge of the transparent original sheet produced and carried out from the printing unit; a sheet ejection port provided horizontally on the original document mounting table; and the sheet ejection port. 2. The overhead projector according to claim 1, further comprising a stacker connected to the stacker for stacking and storing discharged transparent original sheets. 3. The printing section is composed of a sheet roller that sets a continuous transparent sheet, a thermal head and a platen roller that face each other across the transparent sheet fed out from the sheet roller, and a cutter that cuts the transparent sheet. Claim 1
Overhead projector as described. 4. The printing section includes a hopper that sets multiple transparent sheets, a hopper roller that feeds the transparent sheets from the hopper onto the document table,
2. The overhead projector according to claim 1, further comprising a drive unit that rotationally drives the hopper roller, and a thermal head and a platen roller that face each other with the transparent sheet fed out by the hopper roller interposed therebetween.