JPH1031437A - Electronic information display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic information display device capable of stabilizing the running of a magnetic display body and the operation of an electronic circuit, and further, allowing the device to be made thinner. SOLUTION: This electronic information display device is constituted of a magnetic display sheet 10 which is magnetically writable and erasable and formed endless, a recording head 30 for forming a still picture by applying a magnetic field for recording on the magnetic display sheet 10 according to a signal applied from outside, and an erase head 20 arranged to be brought in contact with the magnetic display sheet 10 for erasing the recorded picture by applying a magnetic field for erasing, and a sheet of non-magnetic but conductive film with a smooth surface is adhered onto a contact face of the erase head 20 and grounded to a case 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an electronic information display device for recording and displaying a still image on a display body based on print information sent from an external host device.

[0002]

2. Description of the Related Art Conventionally, a magnetically responsive magnetic display sheet has been known as a display body which develops or erases color in response to the direction and strength of a magnetic field (for example, Japanese Patent Application Laid-Open No. 48-48).
56393, JP-A-2-146082).

[0003] Such a magnetic display sheet can draw simple characters and figures by contacting a magnet pen with a built-in magnet on the sheet surface, and can be reused many times by erasing. Has been put to practical use.

In recent years, an electronic information display device has been developed which records and displays a still image on a magnetic display sheet by a recording head forming a dot matrix magnetic field based on print information sent from an external host device. Is being done.
Since the electronic information display device can change the display content arbitrarily by remote control from an external host device, it can be installed at public facilities, stations, retail stores, etc. Can be widely announced and advertised. In addition, poster replacement work is not required, which contributes to resource saving of paper and the like, and is therefore expected to be a future bulletin board.

[0005]

In such an electronic information display apparatus, a magnetic display sheet is formed endlessly and circulated and conveyed to perform sub-scanning, and the recording head is reciprocated in the sheet width direction to perform main scanning. To perform two-dimensional scanning. When erasing an image, an erase head having a length equal to or greater than the sheet width is brought into close contact with the back side of the magnetic display sheet, and continuous erasing can be performed by moving the magnetic display sheet.

Since the magnetic display sheet moves cyclically,
The contact surface of a member that slides on the sheet such as an erasing head or a platen is worn or charged by friction. If the friction with the magnetic display sheet is large, the life of the member will be shortened,
The required torque of the transport motor increases. Further, if electric charges are accumulated in the member due to frictional charging, the electric charges may become a noise source in an electronic circuit at the time of spark discharge, which may cause a malfunction.

It is an object of the present invention to provide an electronic information display device capable of stabilizing the running of a magnetic display and the operation of an electronic circuit.

[0008]

SUMMARY OF THE INVENTION The present invention is based on a display body which is writable and erasable and has an endless shape, a conveying means for circulating the display body, and a print signal from the outside. A recording means for forming a still image on the display, and an erasing means for erasing the still image on the display, wherein the display is grounded by a conductive sliding contact member. An electronic information display device characterized in that: According to the present invention, since the display body is grounded by the conductive sliding contact member, the charge generated by the circulating conveyance and the frictional charging by the sliding contact member is quickly discharged, so that noise generation and dust on the sheet are generated. Adhesion can be prevented.

Further, according to the present invention, the erasing means is arranged so as to be in sliding contact with the display, and a non-magnetic and conductive film having a smooth surface is adhered to a contact surface of the erasing means.
And is grounded. According to the present invention, by adhering a film having a smooth surface to the contact surface of the erasing means, the friction between the erasing means and the magnetic display is reduced, and the running of the magnetic display is stabilized. At the same time, the driving force of the transfer means can be reduced. Further, by using a non-magnetic film, the erasing magnetic field from the erasing means can reach the magnetic display without attenuating.

Further, the present invention is characterized in that the recording means is arranged so as to be in sliding contact with a display, and a contact surface of the recording means with the display is formed conductive and grounded. According to the present invention, since the recording means that is in sliding contact with the display body is grounded, charges generated by frictional charging are quickly discharged, so that noise generation and erroneous recording accompanying the noise can be prevented.

The present invention further comprises a platen arranged so as to face the recording means, wherein the platen is arranged so as to be in sliding contact with the display, and a non-magnetic and conductive film having a smooth surface is provided. It is affixed to the contact surface of the platen and grounded. According to the present invention, since the platen that is in sliding contact with the display body is grounded, charges generated by frictional charging are quickly discharged, so that noise can be prevented. Further, by using a non-magnetic film as the film, there is no fear that the recording magnetic field generated by the recording means is adversely affected, and stable recording can be achieved.

Further, the present invention is characterized in that the film is formed of a synthetic resin. According to the present invention, by forming a film with a synthetic resin such as PET (polyethylene terephthalate) or a fluorine resin, it is possible to easily realize low friction and conductivity.

[0013]

FIG. 1 is a side sectional view of an electronic information display device according to the present invention, FIG. 2 is a partial perspective view thereof, and FIG. 4 is a partial perspective view of an erasing head and its periphery. FIG. 5 is a partial perspective view of a recording head, a platen, and the periphery thereof. The housing 1 is formed of a metal such as iron or SUS (stainless steel), and a driven roller 50 is disposed in an upper portion inside the housing 1, and a driving roller 6 is disposed in an inner lower portion.
A flexible endless magnetic display sheet 10 is suspended between the two rollers 50 and 60. The roller 50 is urged upward by an elastic member (not shown) such as a spring, and applies a constant tension to the magnetic display sheet 10 to stabilize the running of the sheet and maintain the flatness of the sheet surface. The roller 60 includes a gear 61,
It is rotationally driven by a motor 63 via 62. By driving the roller 60, the magnetic display sheet 10 is moved from bottom to top on the front side of the housing 1 (right side in FIG. 1 and rear side in FIG. 2), and on the rear side of the housing 1 (left side in FIG. 1). Circulates from top to bottom.

The rollers 50 and 60 are made of a metal such as iron, aluminum, or a copper-based sintered bearing, and are grounded to the housing 1.

A display window 2 made of a transparent material such as acrylic resin or glass is formed on the front surface of the housing 1, and an opaque portion 2a is formed on the upper and lower portions of the display window 2 to hide the internal mechanism. .

The magnetic display sheet 10 is stretched between the rollers 50 and 60 to form two opposing surfaces, and the front side sheet is close to the display window 2. The rear side sheet is pressed by a pair of rollers 51 and 52 that change the sheet conveyance path, and is displaced toward the front side sheet to the vicinity of an imaginary plane connecting the respective central axes of the rollers 51 and 52. By providing the rollers 51 and 52 for changing the path, the space surrounded by the magnetic display sheet 10 can be reduced, and a space is created in the internal space on the back side of the device, which contributes to the reduction in thickness of the device. .

The rollers 51 and 52 are made of metal such as iron or aluminum, and are grounded to the housing 1.

The recording head 30 is a sheet on the rear side of the magnetic display sheet 10 and is installed below a flat portion on a transport path between the rollers 51 and 52, and prints from an external host device (not shown). A dot-matrix recording magnetic field is generated toward the surface of the magnetic display sheet 10 based on the signal. The recording head 30 has a plurality of electromagnetic coils arranged in a staggered manner, for example, and is mounted on a carriage 31 that reciprocates in the sheet width direction. The carriage 31 is 2
Endless belt 3 suspended between two pulleys 34, 35
3 and is driven by a motor 36 that rotationally drives a pulley 35 while being guided by a guide 32.

The guide 32 is composed of an axial guide 32a and a U-shaped guide 32b.

The recording head 30 has a sliding contact portion 30a that comes into sliding contact with the guide 32b and conducts electricity. Sliding part 30a
Are copper-based sintered bearings, which are metals with high wear resistance (N
TN company bare fight).

In order to maintain the flatness of the printing portion of the recording head 30, a plate-like platen 25 having a length about the sheet width is provided so as to sandwich the magnetic display sheet 10, and the platen 25 has a U-shaped cross section. The support member 26 is fixed to the support member 26.
On the surface of the platen 25, a film 2 having a smooth surface
5a is adhered, and the running of the sheet is stabilized while maintaining the close contact with the magnetic display sheet 10. The film 25a is formed of a synthetic resin film such as PET (polyethylene terephthalate), and is further provided with a conductivity and is provided with a platen 25 with a screw M2 having conductivity such as metal.
And, by being fixedly grounded to the housing 1 through the support member 26, triboelectric charging is prevented.

If the rollers 51 and 52 for changing the path are not provided, the recording head 30 projects from the rear sheet to the rear side, and the depth of the apparatus is required by the thickness of the recording head 30. In the present invention, the magnetic display sheet 10 is provided by providing the rollers 51 and 52 for changing the path.
Is displaced to the front side, the protrusion of the recording head 30 is reduced, and the device is made thinner.

A sensor P for detecting the reference position of the magnetic display sheet 10 is provided near the upstream side of the recording head 30 in the sheet conveyance.
Is provided. The sensor P is composed of, for example, a photo sensor including a light emitting diode and a photodiode,
The initial position of the magnetic display sheet 10 is detected by detecting the presence or absence of a transmission hole (not shown) formed at the end of the magnetic display sheet 10.

The erasing head 20 is composed of a permanent magnet having a length equal to or greater than the sheet width, and is disposed above the front side sheet of the magnetic display sheet 10 and in close contact with the back side of the magnetic display sheet 10. I have. The erasing head 20 is configured such that two erasing magnets 20a and 20b are fixed to a flat portion of a U-shaped support member 21 formed of metal such as iron. The erasing magnet 20a on the upstream side of the sheet conveyance has a plurality of magnets having different poles alternately arranged in the sheet conveyance direction, generates a strong magnetic field, and erases a still image on the sheet at a stretch. In the erasing magnet 20b on the downstream side of the sheet conveyance, a plurality of magnets having different poles are alternately arranged at a fine pitch in the sheet width direction, and a weak magnetic field is generated to eliminate erasing unevenness.

A film 20c having a smooth surface is adhered to the surfaces of the erasing magnets 20a and 20b, so that the running of the sheet is stabilized while maintaining the close contact with the magnetic display sheet 10. The film 20c is formed of a synthetic resin film such as PET, and by using such a nonmagnetic material, the erasing magnetic field from the erasing magnets 20a and 20b can reach the magnetic display sheet 10 without being attenuated. Further, by imparting conductivity to the film 20c and passing through the erase magnet 20a or 20b and the support member 21 with the conductive screw M1 made of metal or the like and fixedly grounded to the housing 1, frictional electrification is prevented. ing.

Further, the magnetic display sheet 10 is
A pair of pressing rollers 53 and 54 are provided to press to the 0 side, and the adhesion between the magnetic display sheet 10 and the erasing head 20 is enhanced to improve erasing characteristics.

Further, the entire write head 22 composed of a permanent magnet having a length equal to or longer than the sheet width is used as the erase head 2.
The magnetic particles are provided on the surface side of the magnetic display sheet 10 on the upstream side of the transfer sheet 0 so as not to contact the magnetic display sheet 10 so that the entire surface is forcibly written before erasing. The erasing characteristics are improved by increasing the fluidity.

FIG. 3 is a partial sectional view showing the structure of the magnetic display sheet 10 and the recording head 30. On the magnetic display sheet 10, microcapsules 15 that develop color in response to magnetism are applied and fixed over the entire surface. The microcapsule 15 is composed of a high-viscosity liquid and a spherical shell that holds the liquid tightly, and substantially black magnetic particles and substantially white non-magnetic particles are dispersed in the liquid. For example, black iron oxide (FeO) particles having a particle size of 0.1 to 5 μm are used as magnetic particles, and non-magnetic particles have a particle size of 0.1 μm.
White titanium oxide particles of 1 to 5 μm are used. Also,
As the high-viscosity liquid, an aqueous liquid, an oil or fat, an organic solvent including a surfactant-based solvent, or the like is used. Gelatin is mainly used as a material of the spherical shell, and the particle size of the microcapsules 15 is 1
It is distributed in the range of 00 to 1000 μm.

The microcapsules 15 are kneaded with a binder 14 made of a highly transparent synthetic rubber-based adhesive or the like, and applied to a substrate 11 made of a transparent material such as polyethylene terephthalate.
A μm capsule coating layer 12 is formed.

On the back surface of the capsule coating layer 12, a protective sheet 13 made of, for example, a polypropylene long-fiber non-woven fabric is adhered so as to have a thickness of, for example, 300 to 1000 μm.
Seat running is facilitated.

On the other hand, the recording head 30 has a box-shaped yoke 39 made of a high magnetic permeability material, a magnetic core 37 erected inside the yoke 39, made of a high magnetic permeability material, and an electromagnetic core mounted on the magnetic core 37. And a plurality of magnetic cores 37 and electromagnetic coils 38 corresponding to the plurality of print dots. The magnetic core 37 is formed in a columnar shape, the diameter of the tip portion is formed smaller than the diameter of the middle portion, and a tapered portion whose diameter changes linearly is formed on the way.

The printing surface 39a of the yoke 39 has a number of circular voids formed therein, and the leading end of the magnetic core 37 is positioned at the center of each void, so that a void exists between the magnetic core 37 and the void. As a result, a leakage magnetic field is generated. When the electromagnetic coil 38 is selectively energized in response to a print signal, a magnetic field is generated along the axial direction of the magnetic core 37 and passes through a magnetic circuit composed of the magnetic core 37, a gap, and a yoke 39. A recording magnetic field is generated toward the sheet 10.

Next, the principle of magnetic recording / display and erasure will be described. When the recording head 30 is brought close to the surface of the magnetic display sheet 10 where the substrate 11 is located, and a recording magnetic field is generated based on a print signal, the magnetic particles dispersed in the microcapsules 15 are attracted to the substrate 11 and the pressure is reduced. Thereby, the non-magnetic particles move to the protective sheet 13 side.
Then, when viewed from the front side of the magnetic display sheet 10, the portion to which the recording magnetic field is applied is observed to have a substantially black color. By applying the magnetic field in a dot matrix using the recording head 30, characters and symbols can be displayed. Can be recorded.

Next, when the erasing head 20 is brought close to the back side of the magnetic display sheet 10, that is, the side where the protective sheet 13 is located, the magnetic particles dispersed in the microcapsules 15 are attracted to the protective sheet 13 side, and the pressure is increased. As a result, the non-magnetic particles move toward the base 11. Then, when viewed from the front side of the magnetic display sheet 10, the portion to which the erasing magnetic field is applied becomes substantially white, and the erasing magnetic field is uniformly erased by applying the erasing magnetic field to the entire sheet width.

As the above-mentioned high-viscosity liquid in the microcapsule 15, a liquid having a predetermined viscosity is selected in order to maintain the display state of the magnetic particles moved to the back side or the front side by applying a magnetic field. That is, if the viscosity of the liquid is low, the display state is prevented from being disturbed by the particles that have once moved to the front side or the back side settling or moving due to vibration or the like. Therefore, the above-described recording head 3
The magnetic attraction force in the zero and erasing heads 20 needs to be greater than the yield value due to the viscosity of the liquid, and thereby writing and erasing of a display are performed.

Next, the operation of the entire apparatus will be described. Referring to FIGS. 1 and 2, first, before printing is started, the magnetic display sheet 10 is circulated at a constant speed and the erase head 20 is rotated.
To erase the entire surface. Next, a print signal is received from an external host device, and each time the development of image data for one print line is completed, the recording head 30 is moved for several milliseconds to several hundred milliseconds while moving in the sheet width direction. The magnetic printing is performed by applying the pulse current described above and applying a dot matrix magnetic field to the surface of the magnetic display sheet 10.

When printing of one line is completed, the magnetic display sheet 10 is transported by a predetermined feed pitch and stopped, and then printing is performed based on the image data developed for the next printing line. Thus, the development of the image data, the recording head 30
The image of one sheet is formed while repeating the serial printing and the intermittent feeding of the magnetic display sheet 10.

Next, when a new image is printed, the magnetic display sheet 10 is circulated at a constant speed to perform the entire erasing by the erasing head 20, and then the recording head 3 is printed.
Performs serial printing with 0.

In this embodiment, an example is shown in which the device is grounded to a metal device housing. However, the present invention is not limited to this.
It may be grounded to a metal frame member or the like, or a ground wire may be provided to ground to the ground.

[0040]

As described in detail above, according to the present invention, the display body is circulated and slidably contacted by being grounded to a metal device housing or a metal frame member by a conductive sliding contact member. As a result, the charge generated by the triboelectric charging is quickly discharged, so that noise generation and adhesion of dust to the sheet can be prevented. In addition, by adhering a film having a smooth surface to the contact surface of the erasing means, friction between the erasing means and the magnetic display is reduced, the running of the magnetic display is stabilized, and the conveying means is provided. Driving force can also be reduced. Further, by using a non-magnetic film, the erasing magnetic field from the erasing means can reach the magnetic display without attenuating. Furthermore, by imparting conductivity to the film and grounding it to a metal device housing, a metal frame member, or the like, electric charges generated by frictional charging are quickly discharged to the device housing, thereby reducing noise generation. Can be prevented.

Further, by forming the film with a synthetic resin, it is possible to easily realize low friction and imparting conductivity.

In addition, since the recording means which is in sliding contact with the display body is grounded, the electric charge generated by frictional charging is quickly discharged, so that noise generation and erroneous recording accompanying the noise can be prevented.

Further, since the platen which is in sliding contact with the display body is grounded, charges generated by frictional charging are quickly discharged, so that noise generation can be prevented. Also, by using a non-magnetic film as the film, there is no fear of adversely affecting the recording magnetic field generated by the recording means,
A stable record can be achieved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an electronic information display device according to the present invention.

FIG. 2 is a partial perspective view showing an internal configuration of the electronic information display device of FIG.

FIG. 3 is a partial cross-sectional view showing the structures of a magnetic display sheet 10 and a recording head 30.

FIG. 4 is a partial perspective view of an erasing head and its periphery.

FIG. 5 is a partial perspective view of a recording head, a platen, and the periphery thereof.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 housing 2 display window 10 magnetic display sheet 11 base 12 capsule coating layer 13 protective sheet 14 binder 15 microcapsule 20 erase head 22 full surface write head 30 recording head 31 carriage 32 guide 33 belt 37 magnetic core 38 electromagnetic coil 39 yoke 50 , 51, 52, 53, 54, 60 rollers

Claims (5)

[Claims] An endless display body which can be written and erased, a conveying means for circulating the display body, and a still image on the display body based on an external print signal. An electronic system comprising: a recording unit for forming a color image; and an erasing unit for erasing a still image on the display body, wherein the display body is grounded by a conductive sliding contact member. Information display device. 2. The erasing device according to claim 1, wherein the erasing device is disposed so as to be in sliding contact with the display, and a non-magnetic and conductive film having a smooth surface is attached to a contact surface of the erasing device and grounded. The electronic information display device according to claim 1, wherein: 3. The recording means is arranged so as to be in sliding contact with a display, and a contact surface of the recording means with the display is formed conductive.
2. The electronic information display device according to claim 1, wherein the electronic information display device is grounded. 4. A platen disposed so as to face the recording means, wherein the platen is disposed in sliding contact with a display body, and a non-magnetic and conductive film having a smooth surface is provided on the platen. 2. The electronic information display device according to claim 1, wherein the electronic information display device is attached to a contact surface and grounded. 5. The electronic information display device according to claim 2, wherein the film is formed of a synthetic resin.