Polymer light-emitting diodes (PLEDs) with four different emissive layers were fabricated. The current efficiencies of the optimized PLEDs with Spiro-Red (SR), Super Orange (SO), Spiro-Green (SG) and Super Yellow (SY), are 1.23, 4.33, 7.70, and 11.2cd/A, respectively. Electron and hole drift mobilities (μ_n, (μ_p), bimolecular recombination constants (β) of the emissive layers in working PLEDs were determined simultaneously using impedance spectroscopy (IS). The bimolecular recombination constants obtained by the IS measurement were found to be two orders of magnitude smaller than the Langevin recombination constants estimated from electron and hole drift mobilities. It is found that there is correlation between the quantum efficiency estimated from the bimolecular recombination constants and the external quantum efficiency of PLEDs.

An inkjet printing technology is widely used to fields of sign graphics, textile and industry products. The inkjet printing is suitable for various production in small quantities such as the on-demand printing. On the other hand, most of printing objects are plane surfaces, and a screen printing is used for objects having three-dimensional curved surfaces such as bottles. A new mechanism to print on three-dimensional curved surfaces is required to expand the applications for the inkjet printing. A novel inkjet printer which enabled the print on a three-dimensional curved surface of an object has been developed. It has a mechanism of six axes that realize the relative motion of the printer heads and the object, and has an image correction process that gives a good print result. This paper describes the mechanism of the relative motion control and the image correction process of the novel inkjet printer, and evaluation result of print tests.

A method for phase imaging using the radial expansion mode of the piezoelectric transducer is described. The method was used to evaluate the shape and defects of characters “U.S” in the thin samples by piezoelectric transducer in the radial expansion mode and the phase information of ultrasonic vibrations. The imaging results was examined in comparison to the thickness mode vibration imaging. In addition, an aluminum plate sample having a defect (“U.S”) is used as an imaging sample. As the results, when phase imaging is performed with radial vibration, the fringe pattern due to phase wrapping confirmed when phase imaging is performed with thickness vibration is suppressed. Besides, by applying the laser probe method, it was possible to clearly image the shape of the sample surface which is about the spot diameter of the laser. From the results possibility of ultrasonic imaging of defects in thin plate-shaped samples such as electronic circuit boards is clarified.

Recently the negative-charging-type multi-layered organic photoreceptor makes up most photoreceptors which are important devices of electrophotography process. On the other hand, a positive-charging-type single-layered organic photoreceptor have been used by KYOCERA Document solutions due to environment, high-resolution and low-cost. Since the charge generation region of the later photoreceptor is in the vicinity of the photoconductive layer, the charge transport distance in the latent image formation is short. Therefore, it has been proposed that it is little latent image degradation due to charge diffusion. In this report, latent image analysis of EFM (electrostatic force microscopy) and latent image formation simulation in two type organic photoreceptors has revealed that the positive charging-type single layered photoreceptor is superior in resolution.

Novel bisnaphthylquinone compounds (BNQ), were designed as an electron transport material for fabricating single-layered organic photoconductors (OPC) useful for positive charging. These compounds, which have an expandedπ-conjugated plane of the diphenoquinone derivative, have an appropriate electron-accepting property and high electron-transporting performance for phthalocyanine pigments, and have high compatibility with polycarbonate resins. The application to an electron transport material for a single-layer photoreceptor was studied. In the positive charging process of reversal development, a negative charge is applied to the photoreceptor during transfer, and when the electron transport material has low electron transport performance, a negative charge remains in the film, causing a memory phenomenon. In order to solve this problem, we confirmed the effect of using BNQ to reduce the potential and memory for images, and found that it can be used without any practical problems compared to conventional electron transport materials.

In laser printers, to maintain the print quality, a cleaning blade is brought into contact with a photoreceptor to remove residual toner on the photoreceptor surface after the transfer process. However, due to long-term use of the product, abrasion or chipping may occur at the blade, causing color streaks on the printed matter. In this study, a blade-on-disk-type friction tester simulating the cleaning mechanism of laser printers was manufactured and polyurethane blade pieces in contact with a glass disk were observed with the photoelastic method. By using this friction tester, internal stress of the blade was visualized and quantified, and the influence of applied toner on the internal stress was examined. With the finite element method, mechanical behavior of a blade contacting with a sliding glass plate was analyzed. Validity of the internal stress distribution visualized with the photoelastic method was discussed by comparing that analyzed with the finite element method.

We believe that the main purpose of model based development (MBD) is to improve productivity by automating development work and to create new system ideas by analyzing the mechanism of the system.

Modeling by combining physical formulas and advanced simulations requires a large amount of man-hours, which has been a bottleneck when implementing MBD.

We will report on practical examples of the MBD process, such as a simple model construction method that combines experiments with actual machines and general-purpose simulations, AI (Artificial Intelligence), and the use of multi-purpose optimization tools.

Model-based Development (MBD) is attracting attention as tools for further efficiency and improvement of designing quality in these days while product is highly functionalized and diversified. MBD provide improvement of designing quality at an early stage of product development through “front loading” by using simple physical model. This study performed MBD for fuser-nip for laser printer and achieved more detailed design in virtually than before by using simple simulation. The simulation was based on not only heat transfer but also viscoelasticity of tonner. This paper shows a series of details, construction of model, development of fuser-nip and verification.

This article describes the systematic model based development (MBD) approach practiced in the new development of the photoconductor drum drive unit. In the development of the industry's first drive system using a planetary gear, MBD and quality engineering are utilized in upstream process of the design with the objective of effectively ensuring robustness and durability. In the planetary gear design, the influence of molded plastic gear eeror and assembly error have been confirmed. A planetaly gear unit that suppresses rotational fluctuations has designed based on a robust guideline. In the life prediction, a field-proven drive unit is adopted as a benchmark. A degradation test is conducted in market environmental and operating conditions and SN ratio (signal-noise ratio) of the drive units are caluculated by characteristic of startup motor current. A life is predicted from the defference of the SN ratio between the benchmark and the planetary gear. In the servo controller, A design for periodic disturbance reduction is needed. Feedback and feedforward controllers are used to achieve higher performance.

AccurioPress C14000 series was designed as Konica Minolta's flagship model to provide new value to customers and to expand business opportunities. This machine is equipped with various new technologies in the electrophotographic (EP) imaging process, and pursued further “improvement of productivity”, “improvement of reliability”, and “strengthening of media compatibility” from the conventional machine. In this paper, we will introduce the concept and product outline of the AccurioPress C14000 series, and explain the EP imaging process technology newly adopted in this machine, focusing on the development sub-process technology. In the developing sub-process, the double-stage magnetic brush development method, ensures developability in the high-speed process area, adopts a carrier collecting unit that collects carriers scattered from the developing section onto the photoconductor, and “new auto refining method” that detects and controls the fluid level of the developer to improve stability and high durability.

The RICOH Pro C5310S/ C5300S inherits the technology of its predecessor model Pro C5210S/ C5200S and further enhances its functions to strengthen the lineup of Ricoh production printers.

1) High productivity : Output of 80 sheets per minute (C5310S) for both color and monochrome on 52.3 to 256g/m² paper

2) Paper handling capability : Envelope control, non-carbon paper compatible

3) Improved front and back registration accuracy : Main scanning resist adjustment mechanism, sub scanning adjustment mechanism, skew adjustment

4) High image quality stabilization : Interpage density fluctuation correction technology

5) Gloss adjustment : Gloss adjustment mechanism

In 2014, Partial Amendment to the Industrial Safety and Health Act, made it mandatory to assess Risk Assessment for Chemical substance. This is because serious industrial accidents due to chemical substances incurred while working are increasing more and more. Representative example is case of cholangiocarcinoma. After five years from the date on which the amended Act comes into effect, there are still a lot of non-correspondence companies. Therefore the Labor Standards Inspection Office are, in particular, a recent increase of crackdowns on non-correspondence companies by on-site inspections. It is a noteworthy fact. On the other hand, the companies that handled chemical substances are not limited to chemical companies. There are lots of regulated companies including cleaning service, wholesale business, retail business, restaurant, medical care and welfare. I hear that Risk Assessment for Chemical substance looks very difficult, and voluntary action is weak or absent. But now, new useful systems will be developed. I would be fully rewarded for my efforts if this paper proved helpful to the present issues.