JPH095724A - Power source device, charge response medium set consisting of the power source device and charge response medium, hand writing liquid crystal board set, impressing means containing its power source device and writing means for hand writing liquid crystal board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To embody weight and size reduction without limitations in the places of use by subjecting the charges generated by impartation of strains to a piezoelectric element to current rectification, storing these currents and applying the charges to a charge response medium. SOLUTION: This power source device is constituted by connecting the piezoelectric element 1 to a circuit 6 constituted by combining a bridge current rectifier circuit section 3 built-in with high voltage resistant diodes 2 which are four current rectifier elements and a condensed circuit section 5 consisting of a high voltage resistant capacitor 4. The charges generated by imparting the strains to the piezoelectric element 1 are subjected to current rectification in the bridge current rectifier circuit 3 and the stored by the high voltage resistant capacitor 4. The charge are applied to the charge response medium with which the display or recording is possible by the presence of the charges. The power source device is usable also as a power source device for applying the charges onto the display screen of a hand writing liquid crystal board. The charge response medium of such a case is a liquid crystal sheet having a conductive layer and a liquid crystal dispersed polymer layer formed by finely dispersing the liquid crystals into a polymer matrix.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for giving an electric charge to a charge responsive medium capable of displaying or recording due to the presence of electric charge, and a charge response composed of the power supply device and the charge responsive medium. The present invention relates to a handwritten liquid crystal board set in which the medium set and the charge responsive medium are liquid crystal sheets having a conductive layer and a liquid crystal dispersed polymer layer in which liquid crystals are finely dispersed in a polymer matrix. Furthermore, the present invention relates to an application unit for applying an electric charge to a charge responsive medium containing the power supply device and a writing unit for the handwritten liquid crystal board.

[0002]

2. Description of the Related Art Conventionally, as a charge responsive medium capable of displaying or recording by the presence of electric charge, a device for drawing an electrostatic latent image on a dielectric film and sprinkling toner or the like on the electrostatic latent image to visualize the latent image. In the so-called electrophoretic display dispersion system containing electrophoretic particles between electrode plates in a so-called electrophoretic device for displaying or recording by a difference in surface contrast by migrating electrophoretic particles. It is well known that there are electrophoretic displays and the like. In the light control device described in U.S. Pat. No. 4,125,319, in which the particles are oriented in the direction of the electric field due to the presence of electric charges to cause transmission or non-transmission of light to perform display or recording. , A charge responsive medium consisting of a large number of dipolar particles (aluminum flakes) dispersed in an elastic solid matrix. As shown in FIGS. 11 and 12, the display or recording device using this charge responsive medium connects the back electrode e provided on the charge responsive medium B and one output terminal of the power supply device A to the power supply device. The other output terminal of A and the application means C for applying charges to the charge responsive medium B are connected. The power supply device uses an AC commercial power supply or a dry battery.

A liquid crystal sheet having a liquid crystal-dispersed polymer layer in which a liquid crystal is finely dispersed in a polymer matrix, which is disclosed in Japanese Patent Application Laid-Open No. 5-281530 filed by the applicant of the present application, is used. The surface of the liquid crystal sheet is provided with writing means for applying an electric charge from the outside, erasing means for removing the electric charge on the screen, and a power supply for generating an electric charge for orienting the liquid crystal. There is a "handwriting liquid crystal board set" in which an image can be easily written / erased on the screen repeatedly by applying and removing charges on the screen of the liquid crystal board by the means and the erasing means.

The liquid crystal sheet in the handwritten liquid crystal board is such that one terminal of a power supply device for applying an electric charge to the surface is electrically connected to the conductive layer of the liquid crystal sheet, and the other terminal is electrically connected to the writing means. By contacting the writing means with the surface of the liquid crystal sheet, the liquid crystal in the liquid crystal dispersion polymer layer is aligned by the electrostatic field and becomes transparent, and a high-contrast image becomes transparent in the screen of the cloudy liquid crystal sheet. Is what you can get. Further, by electrically connecting the conductive layer of the liquid crystal sheet and the erasing means and making contact with the image, the surface of the liquid crystal sheet and the conductive layer have the same potential, and the electrostatic field is easily removed to erase the image. Is.

As the power supply device, a direct current low voltage power supply, a power switch, and a low voltage generated by the direct current low voltage power supply are disclosed in Japanese Patent Application No. 6-321271 filed by the present applicant. For boosting, a blocking oscillation circuit composed of an oscillation transistor and a boosting oscillation transformer, a rectifying diode for rectifying the voltage generated by the blocking oscillation circuit, and charging the rectified voltage, It has been proposed to use a smoothing capacitor for smoothing the output voltage, and a resistor connected between the smoothing capacitor and the output terminal to regulate the output current value to 5 mA or less.

[0006]

When a commercial power source is used as the power supply device for applying the charge to the charge responsive medium as described above, the place where the commercial power source can be used is restricted and the charge is applied. By doing so, the use place of the display or recording device itself which can display or record is restricted, and there is a problem that it cannot be used outdoors, for example. Further, in the case of using the dry battery, there is a problem of the life of the dry battery, and it is necessary to replace the dry battery each time. Also, in order to give an electric charge and to extend the life of the dry battery, it is necessary to use a battery with a large capacity, and in order to further extend the life of the dry battery, a power switch is inevitably needed. However, the exterior of a display or recording device capable of displaying or recording by applying an electric charge tends to be large, and the weight is heavy.

Particularly, in the above-mentioned handwritten liquid crystal board set, the applicant intends to provide it as a drawing toy for children, and to provide the handwritten liquid crystal board set as a toy for children at the lowest possible price. Then, it is necessary to reduce the manufacturing cost by making the liquid crystal board set as simple as possible and easily assembling it. To this end, it is necessary to reduce the number of parts in the power supply device so that the power supply device can be manufactured at low cost. Also, when a dry battery is used as a power source, as described above, it is necessary to use a power switch or a battery with a large capacity, and the handwriting liquid crystal board itself has to be large in size and heavy in weight. Is a problem when carrying. Furthermore, as a practical matter, the replacement of the dry battery is troublesome for a child because the dry battery box is opened or the substrate is removed from the frame.

The present invention has been made in view of such a fact, and by providing a new power supply device for applying an electric charge to a charge responsive medium capable of displaying or recording due to the presence of electric charge, the charge responsiveness is improved. The present invention provides a display or recording device using a medium, where the place of use is not restricted, the device can be made compact, and the device does not become heavy.

Further, in particular, in the handwriting liquid crystal board set, the weight is reduced so that it does not become a problem when children carry it, and a new handwriting liquid crystal board set requiring no battery replacement work is provided. Is to reduce the manufacturing cost of handwriting LCD board set.

[0010]

In order to achieve the above-mentioned object, the present invention provides a power supply device for applying an electric charge to a charge responsive medium capable of displaying or recording by the presence of electric charge, and a piezoelectric element for generating an electric charge by distortion. And means for applying strain to the piezoelectric element, and a circuit for accumulating the electric charge, which is composed of a rectifying element for rectifying the electric charge generated by the piezoelectric element and a storage element for storing the electric charge.

Since the power supply device of the present invention can be formed compactly because of the above-mentioned structure, the power supply device is attached to or built in the charge responsive medium or the application means for applying the charge to the charge responsive medium. It becomes possible.

The piezoelectric element in the power supply device for a charge responsive medium is one that generates a high voltage by applying strain to the element. The means for applying strain to the piezoelectric element include, for example, a means provided with a mechanism for applying a strain by the impactor colliding with the piezoelectric element by a combination of springs, a means for simply applying pressure, and the like. The circuit for storing charges is called a bridge rectifier circuit, a voltage doubler rectifier circuit, or an N-fold voltage circuit (Cockcroft circuit) in which a rectifier circuit unit and a storage circuit unit are combined together.

Since the power supply device can be constructed in a small space, it can be attached to the frame holding the charge responsive medium, or it can be built in the applying means. By doing so, the charge-responsive medium set can be made compact.

The power supply device according to the present invention can also be used as a power supply device for applying electric charges on the display screen of the above-mentioned handwritten liquid crystal board. The charge responsive medium in a handwritten liquid crystal board is a liquid crystal sheet having a conductive layer and a liquid crystal dispersed polymer layer in which liquid crystals are finely dispersed in a polymer matrix. The conductive layer is a metal, a metal alloy plate foil, or a plastic. , The surface of the glass substrate is metal,
It can be obtained by conducting with a conductive material such as a metal alloy, a metal oxide, graphite, or a conductive polymer.

The liquid crystal dispersed polymer layer is preferably a liquid crystal in which a liquid crystal is dispersed in a polymer matrix in the form of independent droplets.
The polymer forming the liquid crystal dispersed polymer layer may be a polymer having a crosslinked structure. As a method for dispersing the liquid crystal, a polymer-liquid crystal common solvent evaporation phase separation method (common solvent casting method), a polymerization phase separation method in which a polymer precursor is polymerized from a liquid crystal-polymer precursor mixture by light or heat, a liquid crystal There are a melt-cooling phase separation method of cooling a polymer from a heated and molten state, a method of microcapsulating a liquid crystal and dispersing it in a polymer matrix, and the like can be appropriately used.

As the polymer which can be used in the liquid crystal dispersed polymer layer, any polymer which is hardly compatible with the liquid crystal may be used, such as vinyl resin such as chlorinated polyethylene, polypropylene, polystyrene and acrylic resin, vinylidene chloride resin, polyvinyl acetal resin and cellulose resin. , Ionomer, polyamide, polycarbonate, polyphenylene oxide, polysulfone, fluororesin, silicon resin,
Examples thereof include styrene-butadiene rubber, chlorosulfonated polyethylene, polyester and epoxy resin.
Here, the polyvinyl acetal resin is polyvinyl formal, polyvinyl acetal, polyvinyl butyral, or the like.

A polymer having a crosslinked structure (hereinafter referred to as a crosslinked polymer) may be used in the polymer matrix constituting the liquid crystal dispersed polymer layer. Examples of the crosslinked polymer include double bond, nitrile, mercapto, hydroxy, carboxy, Epoxy, chlorine, fluorine, isocyanate, methoxy, amino, a polymer having a functional group such as chlorosulfone, a crosslinked polymer obtained by mixing a polymer such as a silicone polymer with a crosslinking agent that reacts with the functional group, or the above Examples thereof include crosslinked polymers obtained by reacting a polymer having a functional group of (1) with a reactive polymer.

As the crosslinking agent used in the above reaction, organic peroxide, amine compound, aziridine compound, epoxy compound, dicarboxylic acid or carboxylic acid anhydride, formaldehyde, dialdehyde, diol, bisphenol, silanol compound, metal oxide. , Metal halides, photocrosslinking agents (photopolymerization initiators), and the like, and reactive polymers include phenol resins, amino resins, polyisocyanates, polyols, and epoxy resins.

The preferred crosslinked polymer is a crosslinked polymer obtained by reacting a di- or polyisocyanate with a polymer such as a polyvinyl acetal resin, an epoxy resin, an acrylic resin having a functional group such as a hydroxy group or a carboxy group, a polyester resin or a fluororesin. I can give you. A more preferable crosslinked polymer is a crosslinked polymer obtained by reacting di- or polyisocyanate with a polyvinyl acetal resin. Here, the polyvinyl acetal resin is polyvinyl formal, polyvinyl acetal, polyvinyl butyral, or the like.

The liquid crystal used for the liquid crystal sheet is preferably a nematic liquid crystal having a positive dielectric anisotropy, and as the liquid crystal phase,
From the practical point of view of a liquid crystal sheet, a liquid crystal temperature range of about −10 to 100 ° C. and a birefringence Δn of 0.2 or more are preferable in order to improve the white turbidity at the time of OFF. A dichroic dye may be added and used depending on the application.

As a liquid crystal sheet of a handwritten liquid crystal board, a transparent high electric resistance layer may be interposed between a conductive layer and a liquid crystal dispersed polymer layer and sequentially laminated. The movement of charges from the electrodes to the liquid crystal dispersed polymer layer is prevented, and the memory property of the displayed image as a handwritten liquid crystal board can be improved. A transparent high electric resistance layer means a relative humidity of 90 at a temperature of 20 ° C.
% Volume resistivity of 10 ¹³ Ω · cm or more.

The transparent high electric resistance layer can be provided by coating, or by laminating a high electric resistance film with an adhesive or an adhesive. The thickness of the transparent high electric resistance layer is preferably in the range of 0.4 to 10 μm.

As the polymer used for the transparent high electric resistance layer, vinyl resins such as chlorinated polyethylene, polypropylene, polystyrene and acrylic resin, vinylidene chloride resin, polyvinyl acetal resin, cellulose resin, ionomer, polyamide, polycarbonate, polyolefin oxide and polysulfone. , Fluororesin, silicon resin, styrene-butadiene rubber, chlorosulfonated polyethylene, polyester, epoxy resin and the like. Here, the polyvinyl acetal resin is polyvinyl formal, polyvinyl acetal, polyvinyl butyral, or the like.

Further, the following crosslinked polymers can be used, for example, functional groups such as double bond, nitrile, mercapto, hydroxy, carboxy, epoxy, chlorine, fluorine, isocyanate, methoxy, amino and chlorosulfone. A cross-linked polymer obtained by mixing a polymer having a functional group with a cross-linking agent that reacts with a polymer having a functional group or a cross-linking polymer obtained by mixing a reactive polymer with a polymer having a functional group described above and reacting And cross-linked polymers.

As the crosslinking agent used in the above reaction, organic peroxide, amine compound, aziridine compound, epoxy compound, dicarboxylic acid or carboxylic acid anhydride, formaldehyde, dialdehyde, diol, bisphenol, silanol compound, metal oxide. , Metal halides, photocrosslinking agents (photopolymerization initiators), and the like, phenolic resins, amino resins, polyisocyanates, polyols, epoxy resins and the like as reactive polymers.

The preferred crosslinked polymer is a crosslinked polymer obtained by reacting a di- or polyisocyanate with a polymer such as a polyvinyl acetal resin, an epoxy resin, an acrylic resin having a functional group such as a hydroxy group or a carboxy group, a polyester resin or a fluororesin. Can be shown. A more preferable crosslinked polymer is a crosslinked polymer obtained by reacting di- or polyisocyanate with a polyvinyl acetal resin. Here, the polyvinyl acetal resin is polyvinyl formal, polyvinyl acetal, polyvinyl butyral, or the like.

Examples of the reactive material include, for example, di- and polyisocyanate compounds as the cross-linking agent, and polyvinyl alkaryl, epoxy resin, and the like as the compound that reacts with the cross-linking agent.
Acrylic resin containing carboxyl group, polyester resin,
There are fluororesins.

It is also possible to obtain a film having a high electric resistance as a transparent high electric resistance layer by laminating it with an adhesive or an adhesive. Films with high electrical resistance include polyethylene terephthalate, polyethylene naphthalate, polypropylene, polyethylene, polyvinyl chloride,
Films such as polysulfone, polyphenylene oxide, ionomer, polycarbonate, nylon and fluororesin, and silicon dioxide film.

As a liquid crystal sheet of a handwritten liquid crystal board, a transparent insulator layer may be laminated on the liquid crystal dispersed polymer layer in order to protect the liquid crystal dispersed polymer layer. The provision of the transparent insulator layer suppresses the decay of electric charges from the surface of the transparent insulator layer, so that the contour of the displayed image does not bleed with time, which is clear and improves the memory property.
The transparent insulator layer means a layer having a volume resistivity of 10 ¹³ Ω · cm or more at a temperature of 20 ° C. and a relative humidity of 90%, and examples thereof include polyethylene terephthalate, polyethylene naphthalate, polypropylene, polyethylene and polychlorinated. It can be obtained by laminating films of various polymers such as vinyl, polysulfone, polyphenylene oxide, ionomer, polycarbonate, nylon and fluororesin with an adhesive or an adhesive, or by coating and drying a solution of various polymers. .

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION The power supply device of the present invention comprises a piezoelectric element, a means for giving strain to the piezoelectric element, and a circuit for rectifying the electric charge generated by the piezoelectric element and storing the electric charge.
In constructing a circuit, a rectifying element such as a diode is used to rectify electric charges, and a storage element such as a capacitor is used to store electricity. The voltage and current required by the charge responsive medium differ depending on the type of charge responsive medium.Therefore, select the type of each piezoelectric element, diode, and capacitor so as to obtain the required voltage and current, and configure the circuit etc. Need to be configured. In order to avoid the risk of electric shock, it is preferable to connect a protective resistor or the like to the output terminal of the power supply device so that the current flowing through the applying means is 5 mA or less.
Means for applying strain to the piezoelectric element include tapping, pushing, pulling, twisting, and the like. For example, a piezoelectric module provided with a push button section having a built-in spring impact mechanism such as commercially available as an ignition device ( (As shown in FIG. 9) can also be used.

The power supply device thus obtained has a back electrode e on a support plate d as shown in FIG. 11, which acts to transmit or block light by an electric charge, for example, the above-mentioned liquid crystal dispersed polymer layer or electrophoresis. A charge responsive medium B formed by sequentially laminating a layer having a display dispersion system, a charge responsive layer f containing aluminum flakes, and a charge receiving layer (insulator layer) g, or a support as shown in FIG. A power supply is applied to the back electrode e of the charge responsive medium B formed by sequentially laminating the charge responsive layers f ′ of the dielectric film, which form a latent image by charging electric charges on the back electrode e on the plate d. One output terminal of the device A is electrically connected, and the other output terminal is electrically connected to an application unit C for applying charges to the charge responsive medium B. The power supply device A may be attached to the charge responsive medium B, or may be built in the applying means C. The term “electrically connected” means that a cord may be used for connection, or a human body may be used as a conductive medium.

[0032]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a piezoelectric element in a power supply device for applying an electric charge to the surface of a liquid crystal sheet in a handwritten liquid crystal board, a piezoelectric element and a charge generated by the piezoelectric element are rectified without a means for imparting strain to the piezoelectric element. 2 is a circuit diagram showing a state in which a circuit for storing electric charge is connected. The circuit diagram of FIG. 1 shows a piezoelectric rectifier 1 (means for giving strain is not shown) to a bridge rectifier circuit unit 3 (dashed line portion) in which four high-voltage diodes 2 which are rectifiers are assembled.
It is formed by connecting a circuit 6 in which a storage circuit section 5 (a portion indicated by a chain line) including a high withstand voltage capacitor 4 is combined. FIG. 2 shows another embodiment, which is a voltage doubler rectifier circuit 6 in which a piezoelectric element 1 is combined with a rectifier circuit section composed of two high withstand voltage diodes 2 and two high withstand voltage capacitors 4 and a storage circuit section. '(Dashed-dotted line portion) may be configured. Incidentally, 7 and 8 are output terminals of the power supply device.

3 to 5 show an embodiment of a handwritten liquid crystal board having a power supply device composed of the above-mentioned circuit in its main body.
The handwritten liquid crystal board 10 is formed by fixing the liquid crystal sheet 11 to the substrate 12 with an adhesive and fixing the liquid crystal sheet 11 to the frame 13.

In the liquid crystal sheet 11, first, a vapor-deposited aluminum layer of # 125 Metalmy TS (manufactured by Toyo Metallizing Co., Ltd .: an aluminum vapor-deposited film whose base material is polyethylene terephthalate film) is used as a conductive layer. A solution having the composition described in (1) is applied, dried and cured so that the dry film thickness is 3 μm, and a transparent high electric resistance layer is laminated, and Denka formal # 20 (manufactured by Denki Kagaku Kogyo Co., Ltd .: polyvinyl formal) 10% tetrahydrofuran Solution 9.0 g Takenate D110N (manufactured by Takeda Yakuhin Kogyo Co., Ltd .: polyisocyanate) 0.4 g A liquid crystal-dispersed polymer layer in which a liquid crystal is finely dispersed in a polymer matrix is formed on the transparent high electrical resistance layer described above by a solution having the following composition. Was applied, dried, and cured so as to have a dry film thickness of 7 μm, and laminated to obtain a vinylec K-6. 4 (manufactured by Chisso Corporation: polyvinyl formal) 10% tetrahydrofuran solution 4.2 g Takenate D110N (manufactured by Takeda Pharmaceutical Co., Ltd .: polyisocyanate) 0.56 g E44 (manufactured by MERCK: nematic liquid crystal) 0.36 g Further, the above liquid crystal dispersion A transparent insulator layer made of 9 μm Tetron film F (manufactured by Teijin Ltd .: polyethylene terephthalate film) was laminated on the polymer layer by using an adhesive.

On the back surface 14 of the substrate 12, the piezoelectric element 1 serving as a power supply device is formed as shown in the circuit diagram of FIG.
A circuit 6 for rectifying and storing the voltage generated by the piezoelectric element 1 having the one output terminal 7 and the other output terminal 8 is provided. The piezoelectric element 1 is provided with an impact mechanism (not shown) by a spring and is configured as a piezoelectric module 9. A push button portion 9a incorporating the impact mechanism is additionally provided. This is a commercially available ignition device. The push button portion 9a is provided with means for pushing the push button portion 9a so as to be connected to the push button portion 9a.

The above means pivots an insulating rotary member 18 having a handle 17 protruding from the surface 16 of the frame 13 on the display screen 15 side of the handwritten liquid crystal board 10, and the rotary member 1
8 is attached to the shaft portion 19 made of a conductive material.
An insulating rotary cam 20 is fixed so as to be connected to the push button portion 9a of the piezoelectric module 9 on the rear surface 14 side.

In the long strip portion 21 above the frame 13, a sheet-like non-woven fabric (made by Toray Industries, Inc.) of the first tentacle surface electrode 22 having a current value of 5 mA or less flowing therethrough is formed. Liquid crystal sheet 1
It is attached so as to be connected to the first conductive layer (not shown).

The other output terminal 8 is connected to the conductive member 22.
Connected to One of the output terminals 7 is connected to the electrode piece 23 which is in contact with the shaft portion 19 without hindering its rotation. On the surface 24 of the rotating body 18, there is provided a second tentacle surface electrode 26 made of a conductive sponge connected to the shaft portion 19 by a cord 25 and having a current value of 5 mA or less flowing therethrough. One output terminal 7 is the electrode piece 2
It is connected to the second tentacle surface electrode 26 through the shaft 3, the shaft 19 and the cord 25.

This handwritten liquid crystal board is a piezoelectric module 9
And the back surface 14 of the substrate 12 where the circuit 6 is provided
A cover body 27 as shown by a chain double-dashed line is provided on the upper side of the piezoelectric module 9 and the circuit 6 so as to prevent an electric shock.

To display an image on the display screen 15 of the handwriting liquid crystal board 10, first, the rotating body 18 is rotated by holding the handle 17. Then, the rotary cam 20 connected to the rotary body 18 rotates, and the push button portion 9a of the piezoelectric module 9 makes a retracting movement due to the state change of the rotary cam 20 shown in FIG. An impact mechanism is actuated by the spring to distort the piezoelectric element 1 and generate a high voltage. The high voltage is the high withstand voltage capacitor 4 of the storage circuit unit 5.
Is stored in Holding the attached writing member (not shown) and touching the second tentacle surface electrode 26, the display screen 15
Writing above, as described above, the liquid crystal in the liquid crystal dispersion polymer layer is aligned by an electrostatic field and becomes transparent, and a transparent contrast image can be obtained on the screen of the cloudy liquid crystal sheet. When erasing an image, the image is erased by touching the image with an erasing member (not shown) while touching the first tentacle surface electrode 22.

6 to 8 show another embodiment. In the handwritten liquid crystal board 30 of this embodiment, the liquid crystal sheet 11 is used as the substrate 3.
The frame 32 and the back plate 33, which are fixed to 1 by an adhesive
It is stored and fixed between and.

A step portion 35 is provided in the long piece portion 34 below the back plate 33, and a through hole 36 parallel to the step portion 35 is provided. The through-hole 36 has a handle portion 38 on the display screen 37 side of the handwritten liquid crystal board 30, and the piezoelectric module 9 and the circuit 6 similar to those in the above-described embodiment are attached to the attachment portion 40 on the back surface 39 side of the back plate 33. The attached slide piece 41 is slidably arranged. As shown in FIG. 9, a contact member 42 having a rounded tip is attached to the tip of the push button portion 9a of the piezoelectric module 9.

The through hole 3 is provided on the back surface 39 side of the back plate 33.
6, a standing piece 43 is formed so as to surround 6, and the standing piece 43a facing the contact member 42 attached to the push button portion 9a of the piezoelectric module 9 has a wave shape so as to abut against the contact member 42. A corrugated piece 44 is attached.

On one short piece portion 45 of the frame 32 on the display screen 37 side of the handwritten liquid crystal board 30, a first tentacle surface electrode 46 made of a conductive sponge so that the current value flowing therethrough is 5 mA or less. A second tentacle surface electrode 47 is provided. One output terminal (not shown) of the power supply device is
It is connected to a conductive layer (not shown) of the liquid crystal sheet 11, and the other output terminal (not shown) has the standing piece 43a.
It is connected to an aluminum thin piece 48 arranged on the upright piece 43b opposed to. Aluminum flakes 48 and the second tentacle surface electrode 4
7 are connected via a cord 49. Therefore, the other output terminal (not shown) is connected to the second tentacle surface electrode 47.
Connected to The first tentacle surface electrode 46 is connected to a conductive layer (not shown) of the liquid crystal sheet 11 via a cord 50.

To display an image on the display screen 15 of the handwriting liquid crystal board 10, first, when the grip 38 is grasped and the slide piece 41 is slid, the piezoelectric module 9 also slides, and the push button of the piezoelectric module 9 is pushed. When the contact member 42 attached to the portion 9a slides along the corrugated piece 43, the push button portion 9a of the piezoelectric module 9 moves in and out, and an impact mechanism is activated by the built-in spring, and the piezoelectric element 1
High voltage is generated by applying distortion to. The high voltage is stored in the high withstand voltage capacitor 4 of the storage circuit unit 5. By holding the attached writing member 51 and writing on the display screen 37 while touching the second tentacle surface electrode 47, an image can be obtained as described above. When erasing an image, the image is erased by contacting the image with an erasing member (not shown) while touching the first tentacle surface electrode 46.

FIG. 10 shows an embodiment in which the power supply device composed of the above circuit is provided in the writing means for applying the electric charge to the liquid crystal sheet of the handwritten liquid crystal board. Writing means 1
00 is a pen type,
1 is made of a conductive material, and the current value flowing there is 5
It is connected to the other output terminal 8 of the power supply device through a protective resistor 107 so that the current will be mA or less. Tip cylinder 102
Is provided with a writing tip 103 made of a conductive sponge, and is connected to one output terminal 7 of the power supply device through a protective resistor 107 so that the current value flowing therethrough is 5 mA or less. is there.

In the barrel 101, the same as in the above-described embodiment of the handwritten liquid crystal board, the piezoelectric module 9 having the piezoelectric element 1 and the impact mechanism by the spring built therein, and the support 104 having the circuit 6 arranged therein are built in. Has been done. One output terminal 7 of the power supply device is connected to the needle body 10 via the protection resistor 107 described above.
5, the needle body 105 is the writing tip 1 described above.
It is connected to 03. A knock body 106 is connected to the push button portion 9 a of the piezoelectric module 9.

To display an image on the display screen of a handwriting liquid crystal board using the writing means 100 of this embodiment, first,
The knock body 106 is pressed several times to cause the push button portion 9a of the piezoelectric module 9 to move in and out, and an impact mechanism is operated by a built-in spring to distort the piezoelectric element 1 and generate a high voltage. The voltage is stored in the high withstand voltage capacitor 4 of the storage circuit unit 5. Then, by writing on the display screen while touching the tentacle surface electrodes connected to the conductive layer of the liquid crystal sheet provided on the handwritten liquid crystal board, an image can be obtained as described above.

As the handwriting liquid crystal board corresponding to the writing means 100 of the present embodiment, since the power supply device is built in the writing means, for example, the tentacle surface electrodes arranged on the handwriting liquid crystal board are electrically conductive of the liquid crystal sheet. Only one tentacle surface electrode connected to the layer is required. Further, the liquid crystal board does not need to be provided with a power supply device.

[0050]

The power supply device for applying charges to the charge responsive medium of the present invention has the above-described structure, and thus has a small number of parts and a simple structure, so that it can be easily manufactured at low cost and does not become heavy. However, there is an advantage that it is not bulky as a power supply device. In addition, since the commercial power source is not used, the place where the display device itself is used is not restricted,
It is possible to provide a display or recording device using a charge responsive medium capable of displaying or recording due to the presence of electric charge, which does not require the work of replacing the dry battery each time due to the life of the dry battery.

In particular, when the power supply device of the present invention is used for a handwriting liquid crystal board, the number of parts in the power supply device is reduced, so that the handwriting liquid crystal board itself can be made compact and the weight can be reduced. Thus, it is possible to provide an advantageous handwritten liquid crystal board when carried. Further, since the dry battery is not used as the DC low voltage power source, there is no need to open and close the substrate for replacing the dry battery, and at that time, there is an advantage that the risk of electric shock to children can be avoided. is there. Further, when the power supply device is built in the writing means and the handwriting liquid crystal board main body is not connected by a cord, when the handwriting liquid crystal board reaches the end of its service life due to the life of the liquid crystal, etc. There is an advantage that only the means can be provided as a replacement part at a low cost.

[Brief description of drawings]

FIG. 1 is an example of a circuit diagram of a power supply device for a handwritten liquid crystal board of the present invention, which includes a piezoelectric element and a circuit for storing electric charges generated by the piezoelectric element.

FIG. 2 is another embodiment of the circuit diagram of the power supply device for the handwritten liquid crystal board of the present invention, which includes a piezoelectric element and a circuit for storing electric charges generated by the piezoelectric element.

FIG. 3 is a rear view of the handwriting liquid crystal board of an embodiment showing a state in which the power supply device for the handwriting liquid crystal board of the present invention is incorporated in the handwriting liquid crystal board.

FIG. 4 is a front view of the handwriting liquid crystal board of the embodiment.

5 is a cross-sectional view taken along the line I-I in FIG.

FIG. 6 is a rear view of a handwriting liquid crystal board of another embodiment showing a state in which the power supply device for the handwriting liquid crystal board of the present invention is incorporated in the handwriting liquid crystal board.

FIG. 7 is a front view of the handwriting liquid crystal board of the embodiment.

FIG. 8 is a sectional view taken along line II-II in FIG.

FIG. 9 is a perspective view of a piezoelectric module including a piezoelectric element in which a contact member is attached to a push button portion in the handwriting liquid crystal board of the embodiment.

FIG. 10 is a vertical cross-sectional view of a writing means for a handwriting liquid crystal board, showing an embodiment in which the power supply device for the handwriting liquid crystal board of the present invention is incorporated in the writing means for the handwriting liquid crystal board.

FIG. 11 is a conceptual diagram of a display or recording device including a charge responsive medium capable of displaying or recording due to the presence of electric charge, a power supply device for applying an electric charge to the charge responsive medium, and an applying unit. .

FIG. 12 is another conceptual diagram of the display or recording device in which the charge responsive medium is different in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piezoelectric element 3 Rectifier circuit section 5 Storage circuit section 6 Circuit 7 One output terminal 8 The other output terminal 10 Handwriting liquid crystal board 11 Liquid crystal sheet 13 Frame body 18 Rotating body 20 Rotating cam 30 Handwriting liquid crystal board 32 Frame body 41 Sliding piece 44 Wavy piece 100 Writing means 103 Writing tip A Power supply device B Charge response medium C Applying means e Back electrode

Claims (5)

[Claims] 1. A piezoelectric element that generates an electric charge by strain,
A charge response that can be displayed or recorded by the presence of electric charges, which includes means for applying strain to the piezoelectric element, and a circuit for storing electric charge that is composed of a rectifying element that rectifies the electric charge generated by the piezoelectric element and a storage element that stores the electric charge. A power supply device that applies an electric charge to a medium. 2. A charge responsive medium set comprising the power supply device according to claim 1 and a charge responsive medium, wherein one output terminal of the power supply device and a back electrode of the charge responsive medium are electrically connected. 3. An applying means for applying an electric charge to a charge responsive medium, comprising the power supply device according to claim 1. 4. The charge responsive medium set according to claim 2, wherein the charge responsive medium is a liquid crystal sheet having a conductive layer and a liquid crystal dispersed polymer layer in which liquid crystal is finely dispersed in a polymer matrix. Board set. 5. The handwriting liquid crystal board according to claim 3, wherein the charge responsive medium is a liquid crystal sheet having a conductive layer and a liquid crystal dispersed polymer layer in which liquid crystal is finely dispersed in a polymer matrix. Writing means.