| Project/Area Number |
05650005
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Applied materials science/Crystal engineering
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| Research Institution | Chiba University |
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Principal Investigator |
KOKADO Hiroshi Department of Image Science, Faculty of Engineering, Chiba University, Professor, 工学部, 教授 (40016358)
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| Co-Investigator(Kenkyū-buntansha) |
HOSHINO Katsuyoshi Department of Image Science, Faculty of Engineering, Chiba University, Research, 工学部, 助手 (50192737)
KITAMURA Takashi Department of Image Science, Faculty of Engineering, Chiba University, Associate, 工学部, 助教授 (20009541)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1994: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1993: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Ferroelectrics / Image Recording / Pyroelectricity / Polyvinylidenefluoride / 画像電体 |
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| Research Abstract |
(1) Copolymer of vinylidene fluoride and tetrafluoroethylene (4 : 1) can be solution coated into films. If have been poled, imagewise heating by a flash gives these films a contrast potential for the toner development. A novel imaging process is proposed based on this.
(2) Investigation of corona charging dynamics of poled and unpoled films revealed that the thermal depolarization by heating occurs no more than 20%. The main part of potential contrast comes from the pyroelectricity. A balance fields of the dipole and the surface charges is lost by the pyroelectricity and subsequently charges decay.
(3) A satisfactory toner image was transferred on paper, with a stroboflash as the heat source, with the energy required for unity image density of about 50mJ/cm^2.
(4) Several light absorbers were incorporated into the ferroelectric layr and examined. Ionic substances greatly depressed the ferroelectric properties. The bilayr structure was found to be favored than the pigment dispersed monolayr structure.
(5) A lack of mechanical strength imposes a problem for application of the pyroelectric imaging. Some reforming resins were tested. A small amount of such reformers improved the image quality, with a minimal influence on the ferroelectricity.
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