JPH0515083U - Magnetic display device - Google Patents

Abstract

(57) [Abstract] [Purpose] In addition to appropriate writing on a magnetic display sheet, it enables sharp, delicate and relatively clear display on the display surface, and eliminates the fear of collapse of each microcapsule. To do. [Structure] In a magnetic display device, a buffer sheet member for buffering writing pressure of a magnetic pen is arranged on the back surface side of a non-magnetic substrate in a magnetic display sheet.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic display device, and more specifically, a surface of a large number of microcapsules arranged in a plane, the light-absorbing ferromagnetic powder and the light-reflecting non-magnetic fine powder being encapsulated in an oily liquid. By selectively moving to the side and the back side, the incident light from the front side is absorbed or reflected, and the light absorbing ferromagnetic powder in these selected microcapsules is not selected. The present invention relates to an improvement of a magnetic display device which displays a contrast image of light and dark between the light-reflecting non-magnetic fine powder in a microcapsule.

[0002]

[Prior Art]

 Conventionally, as a magnetic display device of this type, as shown in FIG. 4, a light-absorbing ferromagnetic powder 3 and a light-reflecting non-magnetic fine powder 4 are sealed in an oily liquid in a suspended state. Using the microcapsules 2, a large number of the microcapsules 2 are applied on the surface of the non-magnetic substrate 6 in a planarly arranged manner to form the display layer 5, and display on the surface of the display layer 5 to the outside. A magnetic display sheet 1 formed by coating a possible magnetically transparent protective film, for example, a transparent protective film 7, and the light-absorbing ferromagnetic powder 3 in each of the microcapsules 2 on the surface side by a magnetic piece 12. By selectively magnetically attracting and moving the light-reflecting non-magnetic fine powder 4 to the back surface side, the magnetically attracting and moving light-absorbing ferromagnetic powder 3 causes the transparent protective film on the front surface to move. Make the required display on the 7 side By magnetically attracting and moving the magnetic pen 11 with the tip magnetic piece 12 and, on the contrary, the light absorbing ferromagnetic powder 3 magnetically attracted and moved to the front side of the display layer, It is well known that the light-reflecting non-magnetic fine powder 4 is floated relatively to the surface side to erase the display on the transparent protective film 7 side and a full-magnetization erasing plate 21. Either one of the sheet 1 and the erasing plate 21 which is in contact with the sheet 1 via the non-magnetic substrate 6 on the back side is slidably movable relative to the other. With respect to the erase plate 21, as a form of full-face magnetization, the N pole row and the S pole row are alternately arranged on the surface corresponding to the erase surface at a pitch interval as narrow as possible. It is magnetized in stripes over a plurality of rows.

However, in the case of the conventional magnetic display device having the above configuration, the erasing plate 21 which is in contact with the magnetic display sheet 1 on the back side via the non-magnetic substrate 6 is slid to display the display layer 5 and further. The display on the side of the transparent protective film 7 is completely erased, and in the state where the erasing plate 21 is held outside the display range of the magnetic display sheet 1, the light absorbing strength in each microcapsule 2 is increased. The magnetic powder 3 is settled on the back surface side of the display layer 5, and in place of this, the light-reflecting non-magnetic fine powder 4 is relatively floated to the surface side and divided, and is incident on the transparent protective film 7 from the outside. The light is totally reflected by the light-reflecting non-magnetic fine particles 4 that are floated to the surface side on the magnetic display sheet 1, and no display is made.

Further, in a state where the display on the magnetic display sheet 1 on the transparent protective film 7 side is completely erased, the magnetic pen 11 is used, and the magnetic piece 12 at the tip of the magnetic pen 11 is used to make the transparent film. By writing desired characters, figures, etc. on the surface of the protective film 7, in the portion of the display layer 5 where the magnetic piece 12 is indirectly contacted, that is, in each microcapsule 2 in the selected portion, The absorptive ferromagnetic powder 3 is magnetically attracted by the magnetic force of the magnetic piece 12 and moved to the front surface side of the display layer 5, and the light-reflecting non-magnetic fine powder 4 is relatively settled to the back surface side. On the transparent protective film 7 side, the incident light from the outside is absorbed only by each of the light absorbing ferromagnetic powders 3 selectively levitated on the surface side of the display layer 5, and is levitated without being selected. It is not reflected by each light-reflecting non-magnetic fine powder 4 of ゝ. As a result, the desired characters, figures, etc., are drawn and displayed as a contrast image of light and dark.

Further, with respect to the entire surface of the magnetic display sheet 1, the transparent protective film 7 side is displayed on the magnetic display sheet 1 by the light-absorbing ferromagnetic powder 3 which is floated to the surface side. By slidingly moving the erasing plate 21, the light absorbing ferromagnetic powder 3 is magnetically attracted by the magnetic force of the erasing plate 21 in all the microcapsules 2 of the display layer 5 contrary to the above. Since the light-reflecting nonmagnetic fine powder 4 is relatively entirely floated to the front surface side because it is entirely moved to the rear surface side of the display layer 5, the transparent protective film 7 side is not exposed to the outside. The incident light of was totally reflected by the levitating light-reflecting non-magnetic fine powder 4, and thereby all the display was erased.

[0006]

[Problems to be solved by the device]

 In the magnetic display device using the magnetic display sheet having such a structure, the light-absorbing ferromagnetic powder 3 in the microcapsule 2 is magnetized through the transparent protective film 7 of the magnetic display sheet 1 and the non-magnetic substrate 6. Since the pen 11 and the erasing plate 21 are magnetically attracted and moved, it is preferable to design the transparent protective film 7 and the non-magnetic substrate 6 as thin as possible. In addition, when the magnetic display sheet 1 is formed by the non-magnetic substrate 6, the magnetic display sheet 1 has a disadvantage that it is difficult to effectively maintain a flat surface in a state where the magnetic display sheet 1 has a planar spread.

Further, as shown in FIG. 6, even when the magnetic display sheet 1 is configured to have a hardness capable of maintaining a sufficient planar expansion, the magnetic display sheet 1 is affected by the writing pressure of the magnetic pen 11. It is easy to warp, and it is necessary to devise necessary operations for drawing characters, figures, etc. When characters, figures, etc. are drawn while the magnetic display sheet 1 is warped as shown in FIG. 6, The peripheral portion of the tip of the magnetic pen 11 forms a gap between the magnetic pen 11 and the surface of the magnetic display sheet 1, and a light display portion is generated on both sides of the width of the drawn characters and figures, resulting in sharp image quality. Had the inconvenience of being damaged.

From this point of view, as shown in FIG. 5, a comparatively hard underlay substrate 31 is provided on the lower surface side of the magnetic display sheet 1, and characters and figures are stably drawn on this underlay substrate 31. Is being attempted. However, in a magnetic display device using such a magnetic display sheet 1, the magnetic pen 11 is lightly brought into contact with the surface of the magnetic display sheet 1 so that the desired characters, figures, etc. can be displayed on the magnetic display sheet 1. Although the magnetic display sheet 1 has a feature that it can be easily and surely drawn on the surface, the magnetic display sheet 1 can be used for drawing characters, figures, etc. on the surface of the magnetic display sheet 1 due to the writing habit of a pencil or a ballpoint pen. It was often the case that characters, figures, etc. were drawn while strongly pressing the magnetic pen 11 on the surface of.

When characters, figures, etc. are drawn on the magnetic display sheet 1 on the surface of the underlaying substrate 31 with a strong writing pressure on the magnetic display sheet 1, the transparent protective film 7 is a magnetic piece of the magnetic pen 11. It is partially recessed by 12, and the stress of the writing pressure is directly concentrated on this portion, and each microcapsule 2 in the portion where the writing pressure is concentrated is crushed and is not suitable for reuse. Was there. Further, when the transparent protective film 7 is strongly pressed and deformed by the magnetic piece 12 of the magnetic pen 11, the part continuous with the surface of the magnetic display sheet 1 in contact with the magnetic piece 12 is located on the magnetic piece 12 side. It was pulled in and moved closer to the peripheral portion of the magnetic piece 12, and this portion had a disadvantage that it was a light display portion and the sharpness of the image quality was impaired.

The present invention has been made in order to solve such a conventional problem, and its purpose is to make it easier to write on a magnetic display sheet and to make the display surface sharp and An object of the present invention is to provide a magnetic display device of this kind, which enables delicate and relatively clear display and eliminates the fear of collapse of each microcapsule.

[0011]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the magnetic display device according to the present invention has a cushioning sheet member for cushioning the writing pressure of a magnetic pen, which is arranged on the back side of a non-magnetic substrate in a magnetic display sheet.

That is, the first aspect of the present invention is to apply a large number of microcapsules in which a light-absorbing ferromagnetic powder and a light-reflecting non-magnetic fine powder are suspended in an oily liquid to a non-magnetic substrate surface. As a display layer, and a magnetic display sheet integrally formed by covering the surface with a protective film capable of displaying to the outside, and a magnetic piece at the tip of the protective film By writing from the front side, the light-absorbing ferromagnetic powder in each microcapsule is selectively magnetically attracted and moved to the front side of the display layer, and the light-reflecting non-magnetic fine powder is relatively moved to the back side. In a magnetic display device that includes at least a magnetic pen that sinks and makes a desired depiction display, the writing pressure of the magnetic pen is buffered against the back side corresponding to the writing surface range of the magnetic display sheet. Relaxation A magnetic display device is configured by arranging sheet members.

In addition, in the configuration of the magnetic display device according to the first invention, the cushioning sheet member is stretched on an underlaying substrate, and the cushioning degree of the cushioning sheet material is The pen writing pressure is buffered to prevent collapse of the microcapsules on the one hand, and on the other hand, the image quality of the depiction display is set so as not to deteriorate.

Next, a second invention of this invention has a device housing in which the range of the writing surface is set by a peripheral frame portion, and the magnetic display sheet is fixed in the peripheral frame portion of the device housing. In addition, the underlying substrate on which the cushioning sheet member is stretched is provided with an erasing magnet for erasing the display on the distal end side and an operation grip portion on the proximal end side. A magnetic display device is constructed by slidably moving the underlying substrate with the cushioning sheet member to the back side of the magnetic display sheet inside the device housing while passing through the slit holes opened in the side part. ..

Further, according to a third aspect of the present invention, there is provided a device housing in which a writing surface range is set by a peripheral frame portion, and the buffer sheet member is stretched in the peripheral frame portion of the device housing. The underlay substrate is fixedly arranged, an erasing magnet for erasing the display is provided on the base end side of the cushioning sheet member, and the magnetic display sheet is held by a holding frame having an operating grip portion, and A magnetic display device is constructed by slidably moving the magnetic display sheet held by the holding frame on the front surface side of the cushioning sheet member while passing through a slit hole formed in one side of the housing. is doing .

[0016]

[Action]

 Therefore, in the magnetic display device according to each of the first to third inventions of the present invention, a desired character or figure is written on the surface of the transparent protective film of the magnetic display sheet by the tip of the magnetic piece of the magnetic pen. In this writing, the writing pressure applied to the magnetic display sheet is effectively applied only to the relevant part of the magnetic display sheet with which the magnetic piece is in contact due to the cushioning sheet member arranged on the back side. By being dispersed, the stress concentration on each microcapsule inside the sheet is eliminated, and the collapse of each microcapsule is prevented. In addition, when the cushioning sheet member is stretched on the underlay substrate, in addition to the above-described action, the ease of writing is maintained. Furthermore, by appropriately setting the cushioning degree of the cushioning sheet member, the brush of the magnetic pen can be set. By buffering the pressure, it is possible to adjust the degree of flexure in the relevant part of the magnetic display sheet and the range of the magnetic force spread to ensure the image quality of the depiction display, and at the same time the protection of each microcapsule is further improved.

[0017]

【Example】

 Hereinafter, different embodiments of the magnetic display device according to the present invention will be described in detail with reference to FIGS. In each of the configurations of the embodiments shown in FIGS. 1 to 3, the same reference numerals as those of the configuration of the conventional example shown in FIG. 4 represent the same or corresponding parts.

FIG. 1 is a vertical cross-sectional view schematically showing, in a written state, a schematic configuration of a magnetic display device to which a basic first embodiment of the first invention of the present invention is applied.

Also in the device configuration according to the first embodiment shown in FIG. 1, the magnetic display device is configured as follows.

That is, in the magnetic display sheet 1 as the display means, the light-absorbing ferromagnetic powder 3 and the light-reflecting non-magnetic fine powder 4 are placed in an oily liquid in exactly the same manner as the conventional case. Using the microcapsules 2 encapsulated in a suspended state, a large number of the microcapsules 2 are applied to the surface of the non-magnetic substrate 6 in a planarly arranged manner to form the display layer 5, and the display layer 5 is also formed. The surface is covered with a magnetically permeable protective film that can be displayed to the outside, for example, a transparent protective film 7 and is integrally formed into a thin sheet shape.

Similarly, regarding the magnetic pen 11 having the tip magnetic piece 12 made of a permanent magnet or a magnetic pole piece of a permanent magnet as the writing / drawing means, light absorption in each of the individual microcapsules 2 is similarly performed. By selectively magnetically attracting and moving the ferromagnetic ferromagnetic powder 3 to the front surface side of the display layer 5 by the magnetic piece 12, the light-reflecting non-magnetic fine powder 4 is relatively settled to the back surface side, and is magnetically attracted and moved. The light-absorbing ferromagnetic powder 3 is used to provide a desired display on the transparent protective film 7 side of the surface.

In the case of the first embodiment, the means for erasing the display is not directly related to only the first embodiment here, so it is not shown again. As in the conventional case, it is needless to say that it is necessary to interpose an appropriate erasing magnet on the back surface side of the non-magnetic substrate 6 so that they can slide and move relative to each other.

In the configuration of the first embodiment, however, the back surface side corresponding to the writing surface range for the magnetic display sheet 1, that is, the front surface side positioned in the writing surface range set as required. On the back surface side of the non-magnetic substrate 6 facing the transparent protective film 7 in order to buffer the writing pressure applied from the transparent protective film 7 side by the tip magnetic piece 12 of the magnetic pen 11, for example, various types A cushioning sheet member 41 made of a foam material or the like is arranged, and the cushioning sheet member 41 is used by being stretched on an underlaying substrate 42 formed in a flat plate shape with a relatively hard material. ..

Here, regarding the cushioning sheet member 41, a cushioning degree for counteracting the writing pressure at the time of writing by the tip magnetic piece 12 of the magnetic pen 11 is used, and on the other hand, the collapse of the microcapsule is prevented. On the other hand, it is set to such an extent that the image quality of the depiction display is not deteriorated.

Further, the cushioning sheet member 41 stretched on the underlay substrate 42 corresponds to a preset writing surface, as will be apparent from the description of the configurations of the second and third embodiments described later. And the relative positional relationship with the magnetic display sheet 1 and / or the difference dynamics in both of them, which are premised on erasing the display on the magnetic display sheet 1. Such a typical relationship is as follows. (a) The magnetic display sheet 1 side is fixedly arranged with respect to the writing surface range, and the cushioning sheet member 41 side on the underlaying substrate 42 provided with an erasing magnet at the differential direction end is slidable. 1st aspect which makes it arrange | positioned mechanically. (b) With respect to the writing surface range, the buffer sheet member 41 side on the underlaying substrate 42 having the erasing magnet at the base end in the differential direction is fixedly arranged, and the magnetic display sheet 1 side is slidable. Second mode of dynamically arranging.

Therefore, also in the depiction display in the magnetic display device of the first embodiment configured as described above, the tip magnetic piece 12 of the magnetic pen 11 causes the surface of the transparent protective film 7 of the magnetic display sheet 1 to be displayed. The desired writing pressure is applied to the magnetic display sheet 1 at the time of writing by writing desired characters, figures, etc. on the back surface of the cushioning sheet member 41, which has an appropriate cushioning property. And the relatively rigid underlay substrate 42 makes it effective only at the relevant part of the magnetic display sheet 1 in contact with the magnetic piece 12, and since this corresponding part is flexed to a certain degree, it is written down. The ease is kept good, and at the same time, the stress concentration on each microcapsule 2 inside the seat is eliminated and the fear of being crushed is eliminated. Since the degree of bending is relatively small and the ripple of magnetic force is almost negligible, it is possible to easily secure a delicate, sharp and relatively clear display.

Next, a concrete magnetic display device according to the second and third considerations to which the basic embodiment as the first embodiment is applied will be described in detail with reference to FIGS. 2 and 3. To do.

FIG. 2 and FIG. 3 are vertical cross-sectional views schematically showing the schematic configuration of the magnetic display devices according to the second and third embodiments to which the basic embodiment is applied in the usage mode.

First, a magnetic display device according to the second embodiment shown in FIG. 2 will be described. The structure of the second embodiment is a magnetic display device to which the first embodiment is applied.

In the second embodiment shown in FIG. 2, the magnetic display device has a device casing 51 in which a writing surface range 53 is set by a peripheral frame portion 52, and the peripheral frame portion 52 of the device casing 51. In the underlying substrate 42 in which the magnetic display sheet 1 is fixedly arranged and the cushioning sheet member 41 is stretched, an erasing magnet 43 for erasing the display on the end side, and a base end portion are provided. The operation grip portion 44 is provided on each side, and the underlayment substrate 42 with the buffer sheet member 41 is passed through the slit hole 55 opened at one side portion of the device housing 51, and the magnetic field in the device housing 51 is reduced. It is configured such that it can be pulled out and inserted between the display sheet 1 and the housing back plate 54.

Therefore, in the case of this second embodiment configuration, when the underlaying substrate 42 with the cushioning sheet member 41 is fully pushed into the device housing 51, the magnetic display sheet 1 within the writing surface range 53 is The buffer sheet member 41 on the underlying substrate 42 is arranged in contact with the back surface side, and in this state, arbitrary drawing display by the magnetic pen 11 on the front surface side of the magnetic display sheet 1 is performed as described above. It is possible.

Further, after the drawing display, the operation grip portion 44 at the base end is grasped to slide the underlaying substrate 42 with the cushioning sheet member 41 relative to the magnetic display sheet 1 as shown by an arrow a. That is, by causing the differential, the erasing magnet 43 provided at the end portion in the differential direction rubs the magnetic display sheet 1 from the back surface side within the writing surface range 53 to display the display. On the other hand, on the one hand, the buffer sheet member 41 acts as a sliding resistance against the slit hole 54, so that the magnetic display sheet 1 can be stably maintained and stable for erasing the display. The operation will be performed.

Next, a magnetic display device according to the third embodiment shown in FIG. 3 will be described. The structure of the third embodiment is a magnetic display device to which the second embodiment is applied.

Contrary to the configuration of the second embodiment, the magnetic display device of the third embodiment shown in FIG. 3 displays on the base end side in correspondence with the inside of the peripheral frame portion 52 of the device housing 51. The underlaying substrate 42 (which also serves as the casing backing plate 54) stretched with the cushioning sheet member 41 having the erasing magnet 43 for erasing is fixed to the underlaying substrate 42 with the cushioning sheet member 41. Thus, the magnetic display sheet 1 held by the holding frame 45 having the operation grip portion 44 can be pulled out and operated.

Therefore, also in the case of the configuration of the third embodiment, when the holding frame 45, and by extension, the magnetic display sheet 1 is fully pushed in the device housing 51, the magnetic display sheet 1 is written on the writing surface. The buffer sheet member 41 is to be arranged within the range 53 and is in contact with the back surface side of the magnetic display sheet 1 and the cushioning sheet member 41 on the underlaying substrate 42 is present. It is possible to perform arbitrary drawing display on the front surface side of the magnetic pen 1 with the magnetic pen 11.

Further, after the drawing display, the magnetic display sheet 1 held by the holding frame 45 by holding the operation grip portion 44 at the base end is indicated by an arrow b with respect to the underlay substrate 42 with the buffer sheet member 41. By slidingly moving as shown, that is, by making a differential also in this direction, the erasing magnet 43 provided at the base end in this differential direction causes the magnetic display sheet 1 within the writing surface range 53 to be backside. It can be rubbed from the side to be erased, and the same actions and effects can be obtained.

[0037]

[Effect of the device]

 As described above in detail with reference to each embodiment, according to the first aspect of the present invention, a large number of light-absorbing ferromagnetic powders and light-reflecting non-magnetic fine powders are enclosed in an oily liquid in a suspended state. A magnetic display sheet is formed by coating microcapsules on the surface of a non-magnetic substrate to form a display layer, and the surface is covered with a protective film that can be displayed externally. By writing from the front side of the protective film, the light-absorbing ferromagnetic powder in each microcapsule is selectively magnetically attracted and moved to the front side of the display layer, and the light-reflecting non-magnetic fine powder is relatively moved to the back side. In a magnetic display device that is settled to the side to perform a desired depiction display, a cushioning sheet that cushions the writing pressure of the magnetic pen on the back side corresponding to the writing surface range of the magnetic display sheet. Place parts Therefore, when writing with the tip magnetic piece of the magnetic pen, the writing pressure applied to the magnetic display sheet is effective only on the relevant part of the magnetic display sheet that is in contact with the magnetic piece due to the buffer sheet member arranged on the back side. Therefore, the stress concentration on each microcapsule inside the sheet is eliminated, and the crushing of each microcapsule can be effectively prevented.

In addition, in the configuration of the magnetic display device according to the first aspect of the present invention, the cushioning sheet member is stretched on the underlay substrate to effectively maintain the above-mentioned action and effect as well as the ease of writing. In addition, by appropriately setting the cushioning degree of the cushioning sheet member, it is possible to cushion the writing pressure of the magnetic pen and adjust the degree of bending at the relevant portion of the magnetic display sheet and the range of magnetic force spread. Therefore, it is possible to easily make a delicate and sharp, relatively clear display, and to always ensure a good image quality of the depiction display, and at the same time, further improve the protective action of each microcapsule. have.

According to the second aspect of the present invention, the magnetic display sheet is fixedly arranged in the peripheral frame portion of the device housing in which the range of the writing surface is set by the peripheral frame portion. The underlay substrate with the cushioning sheet member is provided with an erasing magnet on the distal end side and an operation grip portion on the base end side, and the underlaying substrate with the cushioning sheet member is installed in the device housing. Since it is configured so that it can be slidably inserted into the back side of the magnetic display sheet from the slit hole opened in the side part, it is possible to effectively and satisfactorily achieve the required requirements in the first invention. A display device can be configured to enable drawing and display as expected using a magnetic pen, and it is an extremely simple operation that simply slides the underlaying substrate with the cushioning sheet member while holding the operating grip. Product This has the advantage that the drawing display can be surely and completely erased.

Further, according to a third aspect of the present invention, an underlay substrate having a cushioning sheet member stretched in the peripheral frame portion is fixed to the device housing in which the range of the writing surface is set by the peripheral frame portion. And an erasing magnet for erasing the display is provided on the base end side, and the magnetic display sheet is held by a holding frame having an operating grip and is held by this holding frame. From this, it is possible to construct a magnetic display device that effectively and satisfactorily fulfills the required requirements of the first device, and to achieve the intended drawing display using a magnetic pen, and to operate it. It has an excellent feature that the drawing display can be erased surely and completely just by an extremely simple operation of gripping the grip and sliding the magnetic display sheet. It

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view schematically showing, in a written state, a schematic configuration of a magnetic display device to which a first embodiment, which is a basic embodiment of the present invention, is applied.

FIG. 2 is a vertical cross-sectional view schematically showing, in a use mode, a schematic configuration of a magnetic display device according to a second embodiment to which the basic embodiment described above is applied.

FIG. 3 is a vertical cross-sectional view schematically showing, in a use mode, a schematic configuration of a magnetic display device according to a third embodiment to which the basic embodiment described above is applied.

FIG. 4 is a vertical cross-sectional view schematically showing the principle of display and erase operations in a conventional magnetic display device.

FIG. 5 is a vertical cross-sectional view schematically showing a writing state when an underlying substrate is interposed on the back surface side of the conventional magnetic display device.

FIG. 6 is a vertical cross-sectional view schematically showing a writing state when the underlying substrate is not provided on the back surface side of the conventional magnetic display device.

[Explanation of symbols]

 1 Magnetic Display Sheet 2 Micro Capsule 3 Light Absorbing Ferromagnetic Powder 4 Light Reflecting Non-Magnetic Fine Particle 5 Display Layer 6 Non-Magnetic Substrate 7 Transparent Protective Film 11 Magnetic Pen 12 Magnetic Piece 41 Buffer Sheet Member 42 Underlay Substrate 43 Erase Magnet 44 Operation grip 45 Holding frame 51 Device housing 52 Peripheral frame 53 Writing surface range 54 Housing back plate 55 Slit hole

Claims (6)

[Scope of utility model registration request] 1. A large number of microcapsules in which a light-absorbing ferromagnetic powder and a light-reflecting non-magnetic fine powder are enclosed in an oily liquid in a suspended state are applied to a non-magnetic substrate surface to form a display layer, and
A magnetic display sheet integrally formed by covering the surface with a protective film capable of displaying to the outside, and a magnetic piece at the tip, and by writing from the surface side of the protective film by the magnetic piece, each of the above The light-absorbing ferromagnetic powder in the microcapsules is selectively magnetically attracted and moved to the front surface side of the display layer, and the light-reflecting non-magnetic fine powder is relatively allowed to settle to the back surface side, so that the desired magnetic representation is achieved. In a magnetic display device including at least a pen, a magnetic sheet characterized in that a buffer sheet member for buffering writing pressure of the magnetic pen is arranged on a back surface side corresponding to a writing surface range with respect to the magnetic display sheet. Display device. 2. The magnetic display device according to claim 1, wherein the buffer sheet member is stretched on an underlying substrate. 3. The cushioning degree of the cushioning sheet member cushions the writing pressure of the magnetic pen to prevent the microcapsules from being destroyed on the one hand, and to prevent the quality of the depiction display from deteriorating on the other hand. Claims 1 and 2 that are set
A magnetic display device as described. 4. The magnetic display device is arranged in contact with the back surface of the non-magnetic substrate, and the light absorbing ferromagnetic powder on the front surface side of the display layer is transferred to the back surface side by sliding movement with the back surface. 4. An erasing magnet for erasing the display by magnetically attracting and moving the entire surface to the surface, and relatively floating the light-reflecting non-magnetic fine powder to the surface side, is provided. Magnetic display device. 5. An apparatus casing having a writing surface range set by a peripheral frame portion, wherein the magnetic display sheet is fixedly arranged in the peripheral frame portion of the device casing,
In addition, the underlying substrate on which the cushioning sheet member is stretched,
An erasing magnet for erasing the display on the distal end side and an operating grip portion on the proximal end side are provided respectively, and the buffer sheet member with the buffer sheet member is inserted through a slit hole opened in one side portion of the device housing. A magnetic display device, wherein an underlaying substrate is slidably provided on the back surface side of a magnetic display sheet inside the device housing. 6. An apparatus casing having a writing surface range set by a peripheral frame portion, wherein an underlaying substrate on which the buffer sheet member is stretched is fixedly arranged in the peripheral frame portion of the device casing. An erasing magnet for erasing the display is provided on the base end side of the buffer sheet member, and the magnetic display sheet is held by a holding frame having an operation grip portion,
The magnetic display sheet 1 held by the holding frame 45 is slidably provided on the front surface side of the buffer sheet member while passing through a slit hole formed in one side of the device housing. And a magnetic display device.