JPH05303339A - Large-screen display device - Google Patents

Abstract

PURPOSE:To obtain the large-screen display device having plural sheets of display medium sheets, can write images of a high resolution thereon and has a long-term preservable property. CONSTITUTION:A rotary drum 44 wound with a sheet cartridge 4 having plural sheets of the thermally reversible display medium sheets 3 is rotated in an arrow (a) direction and the free ends of the thermally reversible display medium sheets 3 are held by a guide belt 57. A rotary drum 44 is rotated in an arrow (b) direction to introduce the thermally reversible display medium sheet 3 to be selected to a page set passage 47 having a display part 9 when the sheets are released by one sheet each from a sheet separator 48 and the free end of the sheet to be selected is restrained by the sheet separator 48. A platen 73 is then rotated to write the image while a thermal head 71 having an image writing temp. is pressed. The heat roller 61 having the erasing temp. is pressed to the thermally reversible display medium sheet 3 and is rotated to erase the image at the time of erasing the image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large screen display device used for a bulletin system, a guide board, a notice board and the like.

[0002]

2. Description of the Related Art Heretofore, as a device of this kind, a collection of papers "Japan Hardcopy '89" (publisher of the Institute of Electrophotography) 1
Pages 51-154 and "Nikkei Electronics No. 45"
0 "(Nikkei BP) pages 179 to 181. This example will be described with reference to the drawings.

FIG. 20 is a schematic diagram showing the structure of a conventional example, and FIG. 21 is a recording principle diagram of the conventional example.

A recording sheet 201, which is a display medium sheet for forming and displaying a toner image, is supported by two rollers 202 and 203 as an endless belt and is conveyed. The toner image is formed in the lower part of the apparatus, and after the image of one screen is formed, the recording sheet 201 is stopped and the display unit 211 is displayed. The toner image on the recording sheet 201 after the display is changed by the brush 204 as the recording sheet 201 moves.
The recording sheet 201 and the toner 20 are scraped off by the
5 is reused.

The principle of image recording is an image recording method using a conductive magnetic toner 205 and a recording electrode 206 as shown in FIG. The toner 205 is conveyed on the outer fixed sleeve 208 by the rotation of the magnet roller 207 which is magnetized with different polarities alternately. On the fixed sleeve 208, a recording electrode 206 formed of a flexible printed board is attached at a position facing the recording sheet 201. When a voltage is applied to the recording electrode 206 by the electrode driver 209, an electric charge flows in the layer of the toner 205 and the recording sheet 20
1 reaches the toner 205 in contact with the recording layer 201a,
The toner 205 adheres to the recording sheet 201 by the electrostatic attraction with the electric charges of opposite polarities induced in the conductive layer 201b on the recording sheet 201 side. In a region where no voltage is applied, the toner 205 is held on the fixed sleeve 208 side by the magnetic force. Incidentally, 201c is a base layer and is made of a polyester film, and the recording sheet 201 is constituted by 201a, 201b and 201c.

The control unit 210 has an interface unit,
Controls the above mentioned elements. The interface section has an image scanner interface and a video interface as interfaces, and can output images from an external image scanner, personal computer, facsimile, or the like.

In the above-mentioned display device, it is necessary to arrange the recording electrodes 206 so as to correspond to pixels in the horizontal direction (that is, the main scanning direction) one by one, and the resolution is as rough as about 2.7 pixels / mm. ..

[0008]

In the conventional large-screen display device, (1) it is necessary to arrange the recording electrodes in the main scanning direction in correspondence with the number of pixels, so that it is possible to realize a high resolution due to the structure. Can not.

(2) Since the toner is only attached to the recording sheet by the electrostatic attraction due to the electric charge and is not fixed, the display cannot be performed for a long time, and the toner drops due to the vibration.
The quality of the displayed image deteriorates.

(3) Since there is only one screen as a display screen, the displayed image cannot be saved, and when it is desired to display a plurality of screens, it is necessary to erase the image each time and input the display image from the image scanner or facsimile. There is.

(4) Since there is no copy section, the service cannot be performed when a copy of the display screen is desired.

There is a problem that

The present invention has been made in view of the above drawbacks, and uses a plurality of thermoreversible display medium sheets as recording sheets, and the display medium sheets are provided with a heating means such as a thermal head having a high density of pixels. Image is printed and displayed by using a heat roller or the like, and the displayed image is erased by a heat means such as a heat roller to obtain an image with high resolution and excellent image quality. An object is to provide a large-screen display device that can be used.

[0014]

To achieve the above object, in a large screen display device of the present invention, a plurality of thermoreversible display media are provided at the other end of a base sheet having a locking portion at one end. A sheet cartridge in which sheets are mounted at regular intervals, and a sheet conveying drum that extends in a direction intersecting the sheet conveying direction and is rotatably supported and has a hook portion on the outer peripheral portion for hooking a locking portion of the cartridge. ,
Driving means for rotating the sheet conveying drum, seed holding means for holding the free end of the thermoreversible display medium sheet of the sheet cartridge wound around the sheet conveying drum along the outer periphery of the sheet conveying drum, and releasing from the sheet holding means The sheet separator that restrains the free end of the thermoreversible display medium sheet, the page set path that guides the thermoreversible display medium sheet restrained by the sheet separator to the display unit, and the heat reversibility that is retained by driving the driving means. It is provided with page selection control means for releasing the display medium sheets one by one and guiding them to the page setting path.

Further, an automatic image writing means which is provided between the sheet separator and the page setting passage and writes an image at an image writing temperature while conveying the thermoreversible display sheet, and adjacent to the automatic writing means. An automatic image erasing unit which has an image erasing temperature and erases an image while conveying a thermoreversible display medium sheet, an image processing unit which inputs image data from a host and processes it into image writing data, and an automatic image A print control means for controlling the writing means to output the image writing data inputted from the image processing means to the automatic image writing means, and an automatic writing / erasing control for controlling each means at a timing based on a control command inputted from the host. And means.

Further, an image scanner for reading an image while conveying the inserted original document, an analog / digital converting means for inputting an output signal of the image scanner, converting an analog signal into a digital signal and outputting the digital signal to an image processing means, and an image. Document image reading control means for controlling the scanner and the analog / digital conversion means are provided.

Further, a copy means for copying the image writing data inputted from the print control means, a sheet guide passage provided to face the page set passage with the sheet conveying drum interposed therebetween, a page set passage and a sheet guide passage. A sheet image reading means for irradiating the sheet surface of the thermoreversible display medium sheet, which is provided between the sheet guide path and the sheet guiding path, with light to convert the reflected light into an electric signal; It is provided with a switching means for inputting an output signal of the means and a switching operation for outputting to the analog / digital converting means, and an image copying control means for controlling each means at a timing.

[0018]

The page selecting means of the large-screen display device configured as described above drives the driving means to rotate the sheet conveying drum around which the sheet cartridge is wound, and the sheet holding means is provided with the free end of the thermoreversible display medium sheet. Release one by one while holding. The free end of the released sheet of thermoreversible display medium is restrained by the sheet separator each time it is released, but if it is not the page to be selected, it is held again by the sheet holding means via the sheet conveying drum and the next heat is released. The free end of the reversible display media sheet is released. If it is a page to be selected, the sheet conveying drum is inverted and guided to the page setting path and displayed on the display unit.

Further, the automatic writing / erasing control means processes the image data inputted from the host into the image writing data through the image processing means, outputs it to the printing control means, and is guided to the page setting path by the page selecting means. Image writing data is written on the thermoreversible display medium sheet by controlling an automatic image writing means having an image writing temperature.
It also controls the automatic image erasing means having an image erasing temperature to erase the image on the thermoreversible display medium sheet.

Further, the original image reading control means causes the image scanner to read the original image from the inserted original,
It is digitized through the analog / digital conversion means and output to the image processing means. Then, the automatic writing / erasing control means writes to the thermoreversible display medium sheet selected by the page selection control means.

Further, the image copying control means is image data obtained by causing the sheet image reading means to read the image written on the thermoreversible display medium sheet, and image data read by the original image reading control means through the image scanner. And are controlled by the switching means to be output to the analog / digital conversion means. Thereafter, the image data is processed by the original image reading control means as described above and is output to the print control means, so that the image copy control means controls the print control means to copy by the copying means.

Therefore, according to the present invention, the image once written can be stored, the display image has a high resolution and is not deteriorated for a long period of time, and a service can be provided when a copy of the display screen is desired.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. Elements common to the drawings are given the same reference numerals.

FIG. 2 is a perspective view showing the appearance of the embodiment.
1 is a sectional view taken along the line AA of FIG.

The present invention utilizes a single sheet cartridge having a plurality of pages of display media sheets, the construction of which is first described.

FIG. 3 is a plan view showing the structure of the cartridge of the display medium sheet used in this embodiment, and FIG. 4 is a side view of FIG.

The sheet cartridge 4 comprises a base sheet 1 and a plurality of thermoreversible display medium sheets 3. The base sheet 1 is flexible and has a locking portion 2 formed by extending a shaft at one end. A plurality of thermoreversible display medium sheets 3 are attached to one surface side of the base sheet 1 in a state where the end portions thereof are displaced from each other by a constant distance, and one thermoreversible display medium sheet 3 is a constituent unit of the sheet cartridge 4. Make a page. The present applicant has already applied for the thermoreversible display medium sheet 3, and is disclosed in Japanese Patent Application Laid-Open No. 3-200935.
The one disclosed in the publication is used. The thermoreversible display medium sheet used in the present invention will be briefly described below.

FIG. 5 is an enlarged sectional view of the thermoreversible display medium sheet, which comprises a flexible film layer 3a, a coloring layer 3b, a recording layer 3c, and a protective layer 3d. The specific materials and the like of the film layer 3a, the coloring layer 3b, and the recording layer 3c are disclosed in the above-mentioned publication, and therefore omitted. The protective layer 3d is composed of a transparent or translucent film having heat resistance or a UV curing agent. FIG. 6 is a diagram showing a hysteresis curve of transparency change with respect to temperature of the thermoreversible display medium sheet 3 of the present invention, in which the vertical axis represents transmittance and the horizontal axis represents temperature.

As can be seen from FIG. 6, when the thermoreversible display medium sheet 3 is heated to a temperature within the range of 70 ° C. to 120 ° C. which is the melting point temperature of Asmer, the recording layer becomes transparent. Shows the color of the colored support below the recording layer,
When this is cooled to room temperature (about 25 ° C.) as it is, red color remains visible. Furthermore, this is 57-68
When the recording layer is heated to a temperature in the range of ℃, the recording layer becomes opaque (that is, white), and the red color of the colored support becomes invisible, and when it is cooled to room temperature as it is, the opaque state is fixed.

Then, the thermoreversible display medium sheet 3 is heated to 63 ° C.
To a temperature of 70 ° C. to 120 ° C. and then to a room temperature by cooling to room temperature to form a white screen with the thermoreversible display medium, and then heating to a temperature within a temperature range of 70 ° C. to 120 ° C.
With this, if you print by heating a predetermined part of this white screen,
Only the printed portion can see the red color of the colored support, and the other portions remain white, and an image is obtained in which the background portion is white and the printed portion is red.

When the thermoreversible display medium sheet 3 is heated again to 63 ° C. by a heat roller described later after image formation, a white screen is again obtained.

Thus, the thermoreversible display medium sheet 3
It is clear that image formation and erasure can be repeated, and since the temperature for making the recording layer transparent is as wide as 70 to 120 ° C., image formation by the transparent recording method is easy.

The above-mentioned thermoreversible display medium sheet 3 is hereinafter referred to as the display sheet 3.

Returning to FIG. 3, the mark 5 is a sensor reflection patch attached to the base sheet 1, and can indicate the presence of the sheet cartridge.

Next, the structure of the apparatus main body using the sheet cartridge 4 having the above structure will be described. In FIG. 2, the housing 6 is supported by a stand 7, and a cover 8 that opens in the direction of arrow B when the sheet cartridge 4 is mounted and a display unit 9 that displays an image are provided on the front side in order from the top. Also, the housing 6
A printer unit 10 as a copying unit for copying an image and a scanner unit 20 as an image scanner for reading an original image are mounted in the lower part of the table.

An operating unit 100 is provided on the upper surface of the casing of the printer unit 10. As shown in FIG. 1, a rotary drum 44 serving as a sheet transport drum that transports the display sheet 3 by mounting the sheet cartridge 4 on the upper inside of the housing 6 extends in a direction intersecting the sheet transport direction, and is rotatable. It is pivotally supported. Two sides 48a and 48b are provided at the bottom of the rotating drum 44.
-Shaped sheet separator 48 having an apex 48c
Turns the apex 48c toward the rotary drum 44,
It extends in the axial direction. A sheet guide plate 14 is provided at the back of the display unit 9, and a casing unit having the display unit 9 forms a page set passage 47 that guides the display sheet 3 to the display unit 9.

Between the side 48a of the separator 48 and the sheet guide plate 14, an automatic writing unit 60 as an automatic image erasing unit and an automatic erasing unit 70 as an automatic image writing unit.
Are provided so as to extend in the width direction of the display sheet 3, respectively. The automatic erasing unit 60 includes a heat roller 61, a heat roller support member 62 that rotatably supports the heat roller 61, and a rubber roller 63. The heat roller support member 62 and the rubber roller 63 are axially supported by the housing 6, respectively. The heat roller 61 is rotated in the directions of arrows c and d around the shaft 62a of the heat roller support member 62 by driving a motor described later. When rotating in the direction of arrow c, the heat roller 61 is kept at a position away from the rubber roller 63. Conversely, when rotating in the direction of arrow d, the heat roller 61 is pressed against the rubber roller 63. If the display sheet 3 is sandwiched between the heat roller 61 and the rubber roller 63 in this state, the display sheet 3 is returned to the white screen by the heat roller 61 heated to 63 ° C. When the rubber roller 63 is rotated in the direction of arrow e, the heat roller 61 is also rotated in the direction of arrow f, and the display sheet 3 is returned to the white screen by the heat roller 61 one after another and automatically erased.
Incidentally, 64 and 65 are sheet guides.

The automatic writing section 70 is a thermal head 71.
And a head mounting plate 72 to which the thermal head 71 is fixed and which can be rotated about an axis 72a in the directions of arrows g and h,
A platen roller 73 facing the thermal head 71,
A compression coil spring 74 for pressing the thermal head 71 against the platen roller 73, a motor described later for rotating the thermal head 71 in the directions of arrows g and h, and a motor described below for rotating the platen roller 73 in the direction of arrow i. To be done. The rubber roller 63 is also connected by a belt so that when the platen roller 73 rotates in the direction of arrow i by rotating the motor, the rubber roller 63 also rotates in the direction of arrow e.
With this configuration, if the display sheet 3 is sandwiched between the platen roller 73 and the thermal head 71, the platen roller 7
By rotating 3 in the direction of arrow i, it is possible to sequentially feed the image on the display sheet 3 to the page setting path 47 while printing the image with the thermal head 71.

A sheet guiding passage 45 is provided inside the back side of the housing 6 so as to face the page set passage 47.
The sheet guiding passage 45 is a passage used when the sheet cartridge 4 is unwound, and is used for the selected display sheet 3
Is guided to the page set passage 47, the display sheet 3 other than the page is fed to the other side 48 of the sheet separator 48.
It is guided with b interposed. Also, the sheet cartridge 4
When removing the sheet from the rotating drum 44, the sheet cartridge 4
To the cartridge outlet 46, or the display sheet 3 when an image is copied by the printer unit 10. A gap 49 for irradiating the display sheet 3 with light from the light source 17 of the sheet image reading unit 12 as a sheet image reading unit is provided in the middle of the sheet guiding passage 45 so as to extend in the width direction of the display sheet 3.

Since the sheet image reading unit 12 reads the image on the display sheet 3, the image sensor 15, the condenser lens 16, the light source 17, for mounting the mirror and not passing the light of the light source 17 directly to the image sensor 15 and the condenser lens 16. Frame 18 and mirror 19. In the sheet image reading unit 12, the irradiation light R1 from the light source 17 is reflected at the reading position, the reflected light R2 is reflected by the mirror 19, and the reflected light R3 is condensed by the condenser lens 16, and then is reflected by the image sensor 15. Positioned to reach.

Next, the scanner section 20 for reading the original image will be described. The suction roller pair 23a, 23b is the suction port 2
2 is sucked in the direction of arrow j, document guides 24a, 24b, 24c guide the sucked document 21, and discharge roller pairs 25a, 25b guide the guided document 21 from discharge port 26 in the direction of arrow. Discharge in the k direction. The suction roller pair 23a, 23b and the discharge roller pair 25a, 25b are rotated by driving a motor described later. Manuscript 2
1 is a pair of suction rollers 23a and 23b and a pair of discharge rollers 25
When it is between a and 25b, the image is read by the document image reading unit 13. The document image reading unit 13 includes an image sensor 28 for reading an image of the document 21, a condenser lens 29, and a light source 30, and the irradiation light r1 from the light source 30 is emitted from the document 21.
Is reflected at the reading position and the reflected light r2 is reflected by the condenser lens 2
It is positioned so as to reach the image sensor 28 after being condensed at 9.

FIG. 7 is a front view of a main part of the rotary drum, FIG. 8 is a sectional view taken along the line CC of FIG. 7, FIG. 9 is a sectional view taken along the line DD of FIG. 7, and FIG. It is a partial perspective view, and the details of the page selection mechanism will be described with reference to these figures.

In FIG. 7, a pulse motor 50 is a pulse motor as a drive means for selectively rotating the rotary drum 44 in forward and reverse directions, and the shaft of the pulse motor 50 has a drive pulley 51.
Are directly connected to each other, and the drive pulley 51 and the drive belt 5 are
The driven pulley 53 is directly connected to the medium 2.

The drum shaft 54 to which the driven pulley 53 is fixed has the left and right brackets 55a and 5 fixed to the housing 6.
5b is rotatably supported and has a center drum 44a in the center.
However, side drums 44b and 44c are attached to the left and right. Further, as shown in FIG. 8, four guide rollers 55a to 55d are arranged around the center drum 44a, and the center drum 44a and the guide rollers 55a to 55d are arranged.
A guide belt 57 as a sheet holding means is stretched between the sheets. The guide belt 57 is in close contact with the entire circumference of the rotary drum other than the extension direction θ of the sheet cartridge 4 and holds the wound state of the sheet cartridge 4. As shown in FIG. 8, the center drum 44a is provided with a claw 58 as a hook portion on which the locking portion 2 of the sheet cartridge 4 is hooked to wind up the sheet cartridge 4.

Inside the right side drum 44c, an optical sensor 62 having a light emitting element 62a and a light receiving element 62b as shown in FIGS. 9 and 10 is provided on a bracket 59 fixed to a right bracket 55b shown in FIG. is there. Further, the slit 61 is formed on the right side drum 44c in correspondence with the optical sensor 62.
Is provided, and a home patch 60 is attached between predetermined adjacent slits.

The width of the sheet cartridge “present” mark 5 and the home patch 60 described above are made different from each other so that the two can be distinguished by the output width.

FIG. 11 is a waveform diagram showing the sensor output timing of the embodiment. When the winding is performed normally, the output waveform from the optical sensor 62 is the output width indicating the home patch 60 as shown in FIG. The output width t2 indicating the sheet cartridge “present” mark 5 is present between t1 and t1.

In this state, the position where the output width t1 indicating the home patch 60 is detected becomes the drive reference position of the pulse motor 50.

If the output width t2 indicating the sheet cartridge “present” mark 5 is not detected during the detection of the output width t1 indicating the home patch 60, it means that the normal winding is not performed.

FIG. 12 is a side sectional view showing the dimensional relationship between the sheet cartridge 4 and the rotary drum 44 in this embodiment. As shown in FIG. 12, the free end of each page is exposed for a certain length in the winding direction. ..

Although the free end exposed length of each page is the same as the c dimension except for the final page, the free end exposed length of only the last page covered by the page at the beginning of winding is the d dimension.

This d dimension is for obtaining a state in which the free end of any page is not caught on the sheet separator 48 when the sheet cartridge is discharged. Therefore, d> c with respect to the c dimension, and preferably d = 2c. Thus, the winding diameter of the base sheet 1 is set.

FIG. 13 is a plan view of the operation unit, and the operation unit 1
00 has various input keys. A power-on 101 is an input key for setting a power supply state to the entire apparatus, and a power-off 102 is an input key for setting the power supply state to a stop state. The indicator 103 displays the page number of the display sheet 3 currently set and displayed on the sheet guide plate 14. The ten-key pad 104 is an input key for inputting a page number by using a numeral input from 0 to 9, and the clear key 105 is an input key for canceling the numeral input by the ten-key pad 104. The page feed key 106 is an input key for selecting a set of pages next to the page number displayed on the indicator 103, and the direct page key 107 is an input key for directly selecting a set page. The copy key 108 is an input key for copying the image of the display sheet 3 currently set on the sheet guide plate 14 by the printer unit 10.
The continuous display key 109 is an input key for continuously setting and displaying the pages selected by the display page set key described later. Display page set key 110 is numeric keypad 1
An input key for permitting the set display of the pages set in 04, and a display page clear key 111 is an input key for canceling the set display permission set by the display page set key 110. The automatic writing key 112 is an input key for writing the image of the document 21 read by the scanner unit 20 by the image writing unit 70 on the page numbered by the ten key 104, and the automatic erasing key 113 is the display sheet numbered by the ten key 104. 3 is an input key for erasing the image No. 3 by the image erasing unit 60. The suction key 114 is an input key for instructing the suction of the cartridge 4, and the discharge key 115 is an input key for instructing the discharge. When the lock key 116 is locked by this, the page feed key 106, the direct page key 107, the copy key 108, the continuous display key 10
Keys other than 9, the numeric keypad 104, and the clear key 105 are invalidated.

FIG. 14 is a control block diagram of the embodiment.
The control circuit 80 is composed of a microprocessor, memory, etc., and controls the entire apparatus. That is, the control circuit 80
Is an analog switch 83, an analog / digital converter 8
4 (hereinafter referred to as an A / D conversion unit 84), an image processing unit 85,
Motor drive unit 86, sensor driver / receiver 87, lighting unit 88, heater driver 89, interface unit 90
(Hereinafter referred to as I / F unit 90), the print control unit 91, and the operation unit 100 are connected.

The control circuit 80 outputs various control signals based on the operation of the operation unit 100. The motor drive unit 86 drives various motors based on the control signal of the control circuit 80. The sensor driver / receiver 87 drives the optical sensor 62 shown in FIG. 10 and receives the output waveform. Lighting part 88
Is a light source 17 of the sheet image reading unit 12 and a document image reading unit 1
The light source 30 of No. 3 is turned on based on the control signal of the control circuit 80. The heater driver 89 heats and holds the heat roller 61 of the image erasing unit 60 at a predetermined temperature based on the control signal of the control circuit 80. The input terminal of the analog switch 83 is connected to the output terminals of the amplification section A81 and the amplification section B82, and the output terminal is connected to the input terminal of the A / D conversion section 84. The input terminal of the amplification unit A81 is the sheet image reading unit 12
Connected to the image sensor 15 of
The image signal output from is amplified to a certain level. Similarly, the input terminal of the amplification section B82 is the original image reading section 1
3 is connected to the image sensor 28, and the image sensor 2
The image signal output from 8 is amplified to a certain level. The analog switch 83 selects the image signal from the amplification unit A81 or B82 based on the control signal of the control circuit 80 and outputs it to the A / D conversion unit 84. The A / D conversion unit 84 converts the image signal from the analog switch 83 from an analog signal into a digital signal and outputs the digital signal to the image processing unit 85.
The A / D conversion unit 84 includes a shading correction circuit that corrects the unevenness of light irradiation in the sheet image reading unit 12 and the original image reading unit 13 and the peripheral light amount deterioration characteristic due to the lens. The I / F unit 90 outputs the image data of the document or figure created by the host computer 92 to the image processing unit 85. The image processing unit 85 includes the A / D conversion unit 84 or the I / F unit 9
The image signal input from 0 is binarized or halftoned, or the image signal binarized or halftoned by the zoom circuit is enlarged or reduced and output to the print control unit 91 as image writing data. The print control unit 91 outputs the data output from the image processing unit 85 to the thermal head 93 of the printer unit 10 or the thermal head 71 of the image writing unit 70 based on the control signal of the control circuit 80.
The power supply unit 96 is connected to an alternating current of 100 V and converted into a direct current voltage to supply power to the entire device.

During printing, the platen roller 94, which faces the thermal head 93, is rotated by the pulse motor 95 and the thermal paper 11 is sequentially fed out.
Thus, the image is printed on the thermal paper 11. Further, when writing an image on the display sheet 3, the motor 75 drives the image writing unit 7
The thermal head 71 of 0 to rotate the thermal head 7
The display sheet 3 is sandwiched between 1 and the platen roller 73.
When the image on the display sheet 3 is erased, the motor 64 rotates the heat roller 61 of the image erasing unit 60, and the display roller 3 is sandwiched between the heat roller 61 and the rubber roller 63.

Next, the operation will be described with reference to FIGS. 15 to 21. 15 is an explanatory view of the sheet cartridge suction operation, FIG. 16 is an explanatory view of the page selection operation, FIG. 17 is an explanatory view of the automatic erasing operation, FIG. 18 is an explanatory view of the automatic writing operation,
FIG. 19 is a diagram for explaining a sheet cartridge discharging operation, FIG. 20 is a perspective view of a printed thermoreversible display medium sheet, and FIG. 21 is a diagram showing a modified example of automatic writing and erasing.

First, the power-on key 101 of the operation unit 100
When is pressed, the control circuit 80 drives the motor 64 via the motor drive unit 86 to rotate the heat roller 61 in the direction of arrow c, and as shown in FIG. 15, the heat roller 61 and the rubber roller 62 are separated from each other. At the same time as opening, the motor 75 is driven to rotate the thermal head 71 in the direction of arrow g to open the space between the thermal head 71 and the platen roller. This state is maintained except during the automatic write and automatic erase operations described later.

[Sheet Cartridge Set] First, the operator opens the cover 8 in the direction of arrow B to insert the sheet cartridge 4 as shown in FIG. 15, and the locking portion 2 almost contacts the center drum 44a of the rotary drum 44. Set to. When the suction key 114 of the operation unit 100 is pressed, the control circuit 80 drives the motor 80 via the motor drive unit 86 to rotate the rotary drum 44 in the normal direction of arrow a. As a result, the engaging portion 2 is locked by the claw 5 of the center drum 44a.
8, the sheet cartridge 4 moves toward the center drum 44a and the side drums 44b, 44 as shown in FIG.
It is wound up in c.

Even if the suction key 114 is depressed, if the optical sensor 62 located inside the right side drum 44c detects the sheet cartridge “existence” mark 25 on the sheet cartridge 4, the sheet is placed on the rotary drum 44. It is determined that the cartridge 4 is wound, and the depression of the suction key 114 is determined to be invalid, and no operation is performed.

[Page Selection] In the operation unit 100, the page number n is entered using the ten keys 104, and the direct page 107 is pressed. When the page number is input, the number "n" is displayed on the indicator 103. Subsequently, the control circuit 80 controls the motor 50 via the motor drive unit 86.
Is driven to rotate the rotating drum 44 around which the sheet cartridge 4 is wound in the forward direction of the arrow a. Simultaneously with the start of rotation of the sheet cartridge 4, the control circuit 80 determines that the free end of the nth page from the drive reference position is the side 48 of the sheet separator 48.
The drive pulse number for rotating the rotary drum 44 to the point where it is caught by a and is restrained is calculated, and this is calculated as the motor drive unit 86.
Send to. The motor drive unit 86 detects the output width t1 of the home patch 60 in the output waveform of the optical sensor 62 and applies the above-described number of drive pulses to the motor 50 via the motor drive unit 86 from the point where the drive reference position is obtained. As a result, when the free end of the nth page among the plurality of display sheets 3 of the sheet cartridge 4 is hooked on the side 48a of the sheet separator 48, the motor drive unit 86 subsequently gives the motor 50 a reverse rotation instruction. As a result, as shown in FIG.
Rotates in the reverse direction, that is, a certain number of pulses in the direction of arrow b, the winding of the sheet cartridge 4 is released, and the unselected page extends to the sheet guiding passage 45 together with the base sheet 1, and the selected page, namely, The n-th side in which the free end is hooked on the side 48a of the sheet separator 48
Only the page is separated from the other pages, extends in the direction of arrow l in the page setting path 47, is drawn out onto the sheet guide plate 14, and the image of the nth page is displayed on the display unit 9.

When the page feed key 106 is pressed in this state, the rotary drum 44 rotates in the direction of arrow a, the sheet cartridge 4 is wound around the rotary drum 44, and the nth page set in the display order page to be described later. The free end of the display sheet 3 of the (n + 1) th page which is the next page can be hooked on the side 48a of the sheet separator 48 and delivered to the sheet guide plate 14 and displayed on the display unit 9 in the same manner as described above. At this time, the number “n + 1” on the next page is displayed on the indicator 103.

Here, a set of display order pages will be described. When the display page clear key 111 is pressed, the display order of the display sheets 3 on the sheet guide plate 14 is the first.
From the page, the second, third ... Nth, (n + 1) th ... are set. By using the display page set key 110, the display order of the display sheet 3 can be freely selected.
For example, 4th page, 8th page, 2nd page, 10th page
To display the pages in order, first press the display page clear key 111 to clear the order, then press the ten key 104 "4" and then display page set key 1
Press 10. Next, after pressing “8” on the ten-key pad 104, the display page set key 110 is pressed. Further, the "2" key, the display page set key, the "10" key, and the display page set key may be pressed. When the continuous display key is pressed in this set state, the 4th page, 8th page,
The second page and the tenth page are displayed one after another in order and repeated until a new key is pressed. If the display page set key is set without pressing the display page clear key 111, the set page is set following the last set page set previously. The set page number is stored in the memory of the control circuit 80. As described above, it is not necessary to care about the order in which the images are written on the display sheet 3 described later, and it is possible not to display the page that is not desired to be displayed. Generally, the time from selecting a page to displaying it on the sheet guide plate 14 can be increased because there is no automatic erasing or writing operation described later.

[Automatic erasing] The operation of erasing the image written on the display sheet 3 by the automatic writing described later is as follows.

First, when the number "m" of pages for which an image is to be erased is entered using the ten-key pad 104 and then the automatic erase key 113 is pressed, the above-described page selection operation is performed, and the free end of the m-th page is set to the side of the sheet separator 48. Hook on 48a. Next, the control circuit 80 drives the motor 64 via the motor drive unit 86 to rotate the heat roller 61 in the direction of arrow d and press the heat roller 61 against the rubber roller 63 as shown in FIG. In this state, the control circuit 80 drives the motor 50 and the motor 76 via the motor drive unit 86 to move the rotary drum 44 and the rubber roller 63 to the arrow b.
When rotated in the direction of arrow e, the display sheet 3 sandwiched between the rubber roller 63 and the heat roller 61 is erased in white by the heat roller 61 heated to 63 ° C. and is expanded in the direction of arrow p while being erased in white. It is paid out on the plate 14. When the erasing operation is completed as described above, the heat roller 61 is rotated in the direction of arrow c to open the space between the heat roller 61 and the rubber roller 63.

Next, the second method of the automatic erasing operation will be described. First, when the page to be erased is extended and displayed on the sheet guide plate 14 by the page selection operation, and only the automatic erase key 113 is pressed without pressing the ten keys 104, the heat roller 61 is moved to the arrow d as described above.
It rotates in the direction and presses against the rubber roller 63. In this state, when the rotating drum 44 is rotated in the direction of arrow a and the rubber roller 63 is rotated in the direction of the opposite arrow e according to the instruction of the control circuit 80, the sheet cartridge 4 is wound around the rotating drum 44, and the rubber roller 63 and the heat roller are rotated. The display sheet 3 sandwiched between 61 and 61 is turned white one after another by the heat roller 61 heated to 63 ° C. and erased. When all the display sheets 3 are wound around the rotary drum 44, the heat roller 61 is rotated in the direction of arrow c to open the space between the heat roller 61 and the rubber roller 63, and the erasing operation is completed, as described above.

[Automatic Writing] The operation of writing the image of the document 21 read by the scanner 20 on the display sheet 3 of the q-th page is as follows.

First, the numeric keypad 104 is used to enter the number "q" of pages for which an image is to be written, and then the automatic writing key 1
When 12 is pressed, the page selection operation described above is performed, and the free end of the qth page is hooked on the side 48a of the sheet separator 48. Next, the rotary drum 44 is rotated in the direction of the arrow b to extend the sheet of page q, and when the leading edge of the sheet reaches a position slightly past the platen roller 73, the motor 75 is driven via the motor drive unit 86. As shown in FIG. 18, the thermal head 71 is rotated in the direction of arrow h so that the thermal head 72 is pressed against the platen roller 73 by the compression spring 74. Next, the light source 30 shown in FIG. 1 is turned on via the lighting unit 88, and the motor 27 shown in FIG.
By rotating a and 23b and the discharge roller pair 25a and 25b, the document 21 starts moving in the direction of arrow j.
The image reaching the image sensor 28 of the document image reading unit 13 from the reading position on the original 21 is converted into an electric signal as one line in the horizontal direction, and the vertical direction in the vertical direction synchronized with the moving speed of the original 21. A screen is formed as an electric signal, converted into an image signal through the amplification unit B82, the analog switch 83, the A / D conversion unit 84, and the image processing unit 85, and the thermal head 7 of the printer 10 is controlled by the print control unit 91.
It is output to 1. The control circuit 80 drives the motor 76 in accordance with this output signal via the motor drive unit 86 and rotates the platen roller 73 to print on the display sheet 3. As described above, the image of the original 21 can be printed on the display sheet 3. When the image is written on the display sheet 3 in this manner, the image printed mark 3a is also printed by the thermal head 71 outside the image printing effective range of the display sheet 3 as shown in FIG. The unprinted display sheet 3 can be known by detecting the presence or absence of the printed mark 3a. This is checked by the sheet image reading unit 12 described later when the power is turned on, the number of unprinted pages is stored in the memory of the control circuit 80, and the number of written pages is sequentially deleted from the memory when the automatic writing operation is performed. If the number of pages erased when the automatic erasing operation is performed is sequentially added to the memory, the number of unprinted pages can always be known.

Next, the second method of the automatic writing operation will be described. If the automatic write key 112 is pressed without designating the automatic write page with the ten keys 104, the control circuit 8
0 selects one page from a plurality of non-print pages stored in the memory, and selects the non-print page selected by the page selection operation and the automatic writing operation from the scanner 20.
Print the image. When there is no unprinted page, the indicator 103 is blinked to call attention. Although the automatic erasing and the automatic writing are performed separately in this embodiment, since the automatic erasing unit 60 and the automatic writing unit 70 are arranged in a line, the image of the page is automatically erased after the page to be written is selected. An image can be written by the next automatic writing unit 70 while erasing by 60.

[Copying] The copying operation for copying the image of the thermoreversible display medium sheet 3 on the sth page by the printer unit 10 is as follows.

First, when the number "r" of pages to be copied is entered using the ten-key pad 104 and then the copy key 108 is depressed, the free edge of the (s-1) th page is moved to the sheet separator 48 as shown in FIG. To the side 48a. Next, when the rotary drum 44 is rotated in the direction of the arrow b, the (s−1) th page extends to the page set passage 47, and the remaining pages extend to the sheet guiding passage 45 with the sth page at the top. .. When the reading start position of the sth page comes to the reading position, the light source 17 is turned on through the lighting unit 88.
Further, the image on the display sheet 3 of the s-th page reaching the image sensor 15 from the reading position while extending the s-th page in the arrow μ direction is converted into an electric signal as one line in the horizontal direction, and as the vertical direction. Is a screen configured as an electric signal in the vertical direction synchronized with the extension speed of the sheet 3, and the amplification unit A81, the analog switch 83, the A / D conversion unit 8
4, through the image processing unit 85, the image signal is converted so as to be printed on the thermal head 93 and sent to the print control unit 91, and further sent to the thermal head 93, and the thermal paper 1
1 is output. If the page feed key 106 and the direct page key 107 are used for display, and then the copy key 108 is pressed without operating the ten keys, the displayed image is copied.

The image on the display sheet 3 can be printed by the printer unit 10 as described above.

When the printed mark 3a is at the reading position, the signal of the printed mark 3a is sent to the image processing unit 8.
It is taken into the control circuit 80 via 5. Further, a dedicated sensor for reading the printed mark 3a may be separately provided.

[Sheet Cartridge Ejection] The ejection operation of the sheet cartridge 4 is as follows. Operation unit 100
When the discharge key 115 is pressed, the control circuit 80
Drives the motor 50 through the motor drive unit 86 to rotate the rotary drum 44 in the forward direction of arrow a to guide the position of the dimension d shown in FIG.
In 8 we get a state where the free edge of any page is not caught,
Subsequently, the rotating drum 44 is reversely rotated in the direction of the arrow b to extend the sheet cartridge 4 into the sheet guiding passage 45, and the sheet cartridge 4 is extended.
As shown in FIG. 5, the locking portion 2 is stopped when it comes to a position between the claw 58 and the guide belt 57. At this time, the tail portion of the sheet cartridge 4 is led out from the cartridge take-out port 46, and if the operator slightly pulls it, the rotary drum 44 moves in the direction of arrow b.
The sheet cartridge 4 can be ejected by being rotated in the direction.

The above is the description of the operation of the present invention.

When the key is locked by the key lock 116, the control circuit 80 detects this and the suction key 114,
Depressing the eject key 115, the automatic write key 112, the automatic delete key 113, the display page set key 110, and the display page clear key 111 is invalid. Therefore, a third party is prevented from erasing and sucking / discharging the writing sheet cartridge. As the continuous display operation is always performed while the key is locked, the continuous display operation may be performed again after a certain period of time after the third party effective key such as the copy key is pressed and the operation is completed. If a continuous display time set key is newly provided so that the display time during the continuous display operation can be set, the display time on the sheet guide plate 14 is short for simple information and the display time for complicated information. Can be taken for a long time.

Further, if an enlarging / reducing setting key is provided so that the enlarging / reducing rate can be set with the ten keys, the image read by the scanner section 20 can be enlarged / reduced to an arbitrary size and automatically written. You can also

Although the case where the operation is performed by the instruction from the operation unit 100 has been described above, as shown in FIG. 14, the operation and setting can be performed in the same manner by the instruction from the host 92. However, in this case, the image data from the host 92 can also be handled. By connecting to the host 92 in this way, the display device of the present invention can be used online, but can also be used offline without an instruction of the host 92 according to an instruction from the operation unit. In this embodiment, the scanner unit 20
However, the same operation can be performed by removing the scanner unit from the main body and replacing the host computer shown in FIG. 14 with an image scanner device.

In addition, the embodiment of the present invention may be in various forms as follows.

(1) From the present embodiment, the sheet image reading unit 12
This form without the printer section 10 cannot be copied, but has the advantage that a silent copy cannot be made by a third party.

(2) A feature obtained by removing the scanner unit 20 from the feature of (1) This feature automatically writes and erases an image from the host 92, and is a simple-sized large-screen display device.

(3) A form obtained by removing the automatic erasing means and the automatic writing means from the form of (2). The form can perform page selection display operation and suction / discharge operation of the cartridge 4. Therefore, it is possible to automatically write an image on the sheet cartridge 4 in the shapes of the embodiments (1) and (2) and suck the sheet cartridge after the automatic writing into the shape to perform continuous display operation, which is the cheapest. It becomes an off-line type large screen display device.

Finally, a form having a facsimile communication function is also conceivable. As a result, the image data can be transmitted from the facsimile machine on the other side through the telephone line, and the image data can be enlarged and displayed on the thermoreversible display medium sheet 3.

In this embodiment, the thermal head is used as the printer unit, but a printer using a system such as electrophotography or ink jet may be used.

Heat roller 61 and thermal head 71
If the length is increased in the longitudinal direction, the contact with the rubber roller 63 and the platen roller 73 may be poor due to restrictions on strength and accuracy, and the erasing and print quality may deteriorate. Therefore, as shown in FIG. 21, the heat roller 161 and the thermal head 171 are staggered. It will be improved if they are arranged in a shape.

[0086]

Since the present invention is configured as described above, it has the following effects.

By selecting pages from a plurality of display medium sheets, an image once written can be saved,
When it is desired to display using a plurality of screens, pages can be selected, so that the display processing time is shortened.

Further, since the thermoreversible display medium sheet is used as the display medium sheet and writing is performed by a heat means such as a thermal head, the display image has a high resolution and is not deteriorated for a long period of time.

Further, by providing the sheet image reading means and the copying means, the copying service of the image written on the display medium sheet for which the page is selected can be easily performed.

Since the image scanner is provided, the image data can be easily input from the original document in which the image is written.

[Brief description of drawings]

1 is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is a perspective view showing an appearance of an example.

FIG. 3 is a plan view showing a configuration of a sheet cartridge.

FIG. 4 is a side view of FIG.

FIG. 5 is an enlarged cross-sectional view of a display medium sheet.

FIG. 6 is a hysteresis curve of the thermoreversible display medium sheet of the present invention.

FIG. 7 is a front view of a main part of a rotary drum.

8 is a cross-sectional view taken along the line CC of FIG.

9 is a sectional view taken along the line DD in FIG.

FIG. 10 is a perspective view of an essential part showing a sensor part.

FIG. 11 is a waveform diagram of sensor output timing.

FIG. 12 is a relationship diagram of a sheet cartridge and a rotating drum.

FIG. 13 is a plan view of an operation unit.

FIG. 14 is a control block diagram of the embodiment.

FIG. 15 is an explanatory diagram of a suction operation of the sheet cartridge.

FIG. 16 is an explanatory diagram of a page selection operation.

FIG. 17 is an explanatory diagram of an automatic erasing operation.

FIG. 18 is an explanatory diagram of an automatic writing operation.

FIG. 19 is a diagram illustrating a sheet cartridge discharging operation.

FIG. 20 is a perspective view of a printed thermoreversible display media sheet.

FIG. 21 is a diagram showing a modification of automatic write / erase.

FIG. 22 is a schematic view showing a conventional example.

FIG. 23 is a recording principle diagram of a conventional example.

[Explanation of symbols]

 4 sheet cartridge 9 display unit 10 printer unit 12 sheet image reading unit 13 original image reading unit 20 scanner unit 44 rotating drum 47 page setting passage 60 automatic erasing unit 70 automatic writing unit 100 operation unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuichiro Ogata 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (4)

[Claims] 1. A large-screen display device for transporting and displaying a display medium sheet on which an image has been written to a display section, wherein a plurality of thermoreversible sheets are provided at the other end of a base sheet having a locking section at one end. A sheet cartridge in which display medium sheets are mounted at regular intervals, and a sheet transport that extends in a direction intersecting the sheet transport direction and is rotatably supported and has a hook portion on the outer periphery for hooking the locking portion of the cartridge Drum, drive means for rotating the sheet conveying drum, sheet holding means for holding the free end of the thermoreversible display medium sheet wound around the sheet conveying drum along the outer circumference of the sheet conveying drum, and released from the sheet holding means The sheet separator that guides the free end of the thermoreversible display medium sheet and the sheet that guides the thermoreversible display medium sheet guided by the sheet separator to the display unit. A large-screen display device comprising: a page setting path and page selection control means for releasing the thermoreversible display medium sheets that have been driven by the driving means one by one and guiding the sheets to the page setting path. 2. An automatic image writing means which is provided between a sheet separator and a page setting passage and writes an image at an image writing temperature while conveying a thermoreversible display sheet, and adjacent to the automatic writing means. An automatic image erasing unit which has an image erasing temperature and erases an image while conveying a thermoreversible display medium sheet, an image processing unit which inputs image data from a host and processes it into image writing data, and an automatic image A print control means for controlling the writing means to output the image writing data inputted from the image processing means to the automatic image writing means, and an automatic writing erasing for controlling the respective means at respective timings based on a control command inputted from the host. The large screen display device according to claim 1, further comprising a control unit. 3. An image scanner for reading an image while conveying an inserted document, and an analog / digital conversion means for inputting an output signal of the image scanner, converting an analog signal into a digital signal and outputting the digital signal to the image processing means. 3. The large screen display device according to claim 2, further comprising original image reading control means for controlling the image scanner and the analog / digital conversion means, respectively. 4. A copying means for copying the image writing data inputted from the print control means, a sheet guiding passage provided opposite to the page setting passage with the sheet conveying drum interposed therebetween, a page setting passage and a sheet. Sheet image reading means provided between the guide passage and the sheet surface of the thermoreversible display medium sheet guided to the sheet guide passage to convert the reflected light into an electric signal, and the image scanner. A switching means for inputting an output signal of the sheet image reading means and a switching operation for outputting to the analog / digital converting means, and an image copying control means for controlling the respective means at respective timings. The large-screen display device described in 3.