CN1433896A - Piezoelectric electric writing pen for electronic ink display - Google Patents

Abstract

The piezoelectric type electric writing pen for electronic ink display consists of automatic ball-point pen (including refill, shaft and push-button switch) and piezoelectric ceramic, in which the refill and piezoelectric ceramic are placed in the shaft of the pen, said piezoelectric ceramic and the refill can be up-and-down contacted and connected. When it is used for writing, the refill can be sprung out, and can be used for writing on the electronic paper lightly, said repill can apply a pressure to the piezoelectric ceramic, so that two ends of the piezoelectric ceramic can produce positive and negative charges, can be static charges can be collected on the ball-point of the refill to excite a static electric field with 20-200V near by ball-point.

Description

A kind of piezoelectric electric writing pen that is used for electronic ink display

The present invention relates to a kind of display drive apparatus that is used for electronic ink display, particularly a kind of electric writing pen of making driving power by piezoelectric (as piezoelectric ceramics, organic piezoelectrics).

At present, based on the electric ink display material flexible display---Electronic Paper is succeeded in developing.Electronic Paper is made at two-layer transparent organic film intermediate package electric ink, thus Electronic Paper have thin, soft, in light weight, be easy to carry and characteristic such as cheap; Electronic Paper is a reflective display, promptly passive luminescence type display, so Electronic Paper has characteristics such as the wide and environmental protection of high-contrast, visual angle; Electric ink has bistable state, so Electronic Paper has characteristics such as low-power consumption.Electric ink is made up of many microcapsules, and the microcapsules the inside includes liquid paint and many charged solid granulates.When not having electric field, microcapsules demonstrate the color of pigment; Under electric field action, charged solid granulates is poured into one side of microcapsules, thereby microcapsules demonstrate the color of particle; When applying reversed electric field, microcapsules demonstrate the color of pigment again, thereby reach the purpose of demonstration.

In the present prior art, what the display driver mode of Electronic Paper was with the most use is the circuit drives mode, for example the flexible display driver circuit of Lucent's development.These display driver circuit cost height, owing to there is such shortcoming, this type of drive is not widely used in actual product as yet.But utilize electric writing pen to drive in many aspects is very convenient and cheap, for example the electric writing pen of Xerox Corporation's development.But the tail end at these electric writing pens is associated with a lead, and the power supply of electric writing pen is common dc source.Very inconvenient when therefore, writing with such pen.

The purpose of this invention is to provide a kind of piezoelectric electric writing pen that is used for electronic ink display, it is not only simple in structure, with low cost, and meets people's writing style.

The object of the present invention is achieved like this: the piezoelectric of packing in the inner chamber of the common automatic ball pen of plastics.Piezoelectric and pen core are contained in the pen cap, and piezoelectric contacts up and down with pen core and is connected.Pen core is that metal material is made, and pen core can eject or the indentation pen cap by press button.When writing, click the cap for brush, pen core has just ejected, firmly allowing nib draw on display then gently writes, pen core is just given pressure of piezoelectric, thereby produce positive and negative charge at the two ends of piezoelectric, therefore will the static electricity gathered lotus on the nib of pen core, thus near nib, excite an electrostatic field.This electrostatic field just can drive electric ink and show handwriting trace.When not needing to write, click the cap for brush again, pen core is with regard in the indentation pen cap.

Because only need write display and just can make electric ink on the position of nib, demonstrate hand-written track with defeating, so the present invention meets people's writing style as writing usually gently.The present invention forms in the automatic ball pen transformation of common plastics, only is made up of automatic ball pen of plastics (comprising pen core, the pen cap, press button and other part) and piezoelectric, so simple in structure.

The present invention is described in further detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is vertical section structure figure of the present invention.

5. rotating disk 6. guide pads 7. push rods 8. pens cap 9. caps for brush of 1. bead 2. springs, 3. pen cores, 4. piezoelectric ceramics (or organic piezoelectrics) among the figure

The described electric writing pen of Fig. 1 is to transform to form on the basis of the common automatic ball pen of plastics.Electric writing pen comprises an automatic ball pen of common plastics (spring (2), a pen core (3), a rotating disk (5), a push rod (7), a pen cap (8) and a cap for brush (9)) and a piezoelectric ceramics (4).Piezoelectric ceramics (4) and pen core (3) are contained in the inner chamber of the pen cap (8).The lower end of piezoelectric ceramics (4) contacts up and down with pen core (3).

The pen cap (8) is the plastic material of insulation.

Piezoelectric ceramics (4) is of a size of Φ 7 * 15, piezoelectric coefficient g ₃₃〉=2.5 * 10 ^-2Vm/N.

Pen core (3) is selected metal ball pen for use, and its external diameter is 3mm, and suitably clips one section at afterbody.The nib of pen core (3) is the cone of 30 degree, and the end of nib is inlaid with a bead (1).Bead (1) is a metal material, and bead (1) can rotate in nib, and the diameter of bead (1) is 0.05～2mm.The size of bead (1) has just determined the size of person's handwriting.Bead (1) is more little, and the lines of writing out are just thin more.

Use automatic ball pen the same with usual, in the time of need writing, press the cap for brush (9) of ball pen, the cap for brush (9) will move downward together with push rod (7), the wedge of push rod (7) will promote the wedge of rotating disk (5), thereby makes rotating disk (5) while move downward and rotate.Rotating disk (5) promotes piezoelectric ceramics (4) when moving downward and pen core 4 (3) moves downward, thereby pen core (3) compression spring (2) and pen core (3) expose the pen cap (8).Unclamp the cap for brush (9), just move upward, but because rotating disk (5) has rotated an angle, so rotating disk (5) just is directed to piece (6) and has blocked at the restoring force effect lower rotary table (5) of spring (2).The nib of pen core (3) has just exposed the pen cap (8) like this; When not needing to write, the cap for brush (9) of pressing ball pen again just can be in pen core (3) the indentation pen cap (8).

When writing, the most advanced and sophisticated bead (1) of pen core (3) is drawn on display gently and is write, pen core (3) is just given (4) pressure of piezoelectric ceramics, thereby the two ends at piezoelectric ceramics (4) produce positive and negative charge, therefore will the static electricity gathered lotus on the most advanced and sophisticated bead (1) of pen core (3), because the needle point effect will excite one 20～200 volts electrostatic field near nib.The size of electrostatic field voltage is regulated by the pressure of writing, and it is big more to write pressure, and voltage is big more.This electrostatic field just can drive electric ink and show handwriting trace.

In optimum implementation of the present invention, the piezoelectric modulus of piezoelectric ceramics (4) is the bigger the better, and like this, required to write pressure just very little, just can prevent that display from being scratched.The pen cap (8) is an insulating materials, can prevent that like this hand or other approach of electrostatic charge by the people from leaking.Pen core (3) is a conductive material, and like this, electrostatic charge just can focus on the nib.

Claims (4)

1. a piezoelectric electric writing pen that is used for electronic ink display is made up of automatic ball pen of plastics and piezoelectric, it is characterized in that: piezoelectric and pen core are packed in the pen cap, and piezoelectric contacts up and down with pen core and is connected.

2. according to claim 1 described device, the size that it is characterized in that piezoelectric is Φ 7 * 15, piezoelectric coefficient g ₃₃〉=2.5 * 10 ^-2Vm/N.

3. according to claim 1 described device, it is characterized in that pen core is a conductive material.

4. according to claim 1 described device, it is characterized in that the pen core lower end is a cone shape, the bead that it is 0.05～2mm that its end is inlaid with a diameter.