2000Research papers

1.An Algorithm of Real-Time Variable Bit Rate Video Coding for DVD-RW Recorder

Yasuyuki Umehara, Katsutoshi Inagaki, Donghua Liu, Tsutomu Takahashi, Takahiro Horiuchi, Tomohiro Kimura


The authors have developed an algorithm of the Real-Time Variable Bit Rate (VBR) controlled MPEG video coding and implemented its algorithm into the DVD Recorder with the DVD-RW disc which is produced as one of the DVD-family. As the results of this, we could have improved the picture quality better than the Constant Bit Rate (CBR) controlled video coding which is used conventionally for the real-time coding.

2.The Development of BS Digital Broadcasting Prototype Receiver.

Tetsuro Emi, Yasushiro Ayukai, Kyoichiro Fujii, Akimitsu Fujiyoshi, Tatsu Inoue, Kazuya Abe, Reiji Matsumoto, Hideyuki Ohkubo, Ryuichi Todoroki, Yutaka Masumoto


The authors have developed the proto-type receiver corresponding for Japanese BS digital broadcasting system based on the requirement from MPT(Ministry of Posts and Telecommunications) and related organization.
The basic technology of Japanese BS digital broadcasting service, which is including new services(ex. High Definition Television service, Data broadcasting service, Hierarchal transmission service, and so on) has been established by us in this development process.
The technology which have not been corresponded in this development should be developed continuously to meet the receiver mass-production timing

3.ISDB-T:Intergrated Services Digital Broadcasting- Terrestrial System

Koji Takahashi


ISDB-T that is Japanese Digital Broadcasting Terrestrial standard, was fixed on May '99. This standard's fearures are as follows:
・HDTV broadcastiog is possible.
・Mobile reception is possible.
・Supporting Hierarichial layer Transmission.
・Bulding up Singl Frequency Network is Possible.
In this paper the author describes outline of ISDB-T Standard.

4.Application of DAB

Toshihito Ichikawa, Yuki Matsumiya, Kazuhiko Uchiyama, Katsuhiko Toki, Satoshi Nakao


We developed a DAB(Digital Audio Broadcasting) car receiver for consumer use.
DAB is a digital broadcasting system that can provide CD quality sound which means that we can forget about multipath noise.
DAB offers the possibility for a data service for mobile reception.
This product is a hide-away tuner system which is controlled through IP-BUS(Interactive Pioneer-BUS) by head unit. Its circuits consist of an Analog receiver and a Digital signal processing block. Analog receive block is composed of chip set from TEMIC, and Digital signal processing block is composed of chip set from Philips.
As a result of our field tests in Europe we confirmed it had almost the same performance as DAB452(product by Philips) which is used as a reference receiver by broadcasters.
We succeeded to introduce the first generation DAB car receiver(GEX-P900DAB) to the market.

5.The development of Karaoke with Dance

Naoto Inaba, Sanpei Asai, Takayuki Hoshino


The Authors have found the way to reproduce a realistic human motion within a small size data by having the motion sampling technology, which is called the motion capture ,and the 3 demensional computer graphics.Also it is investigated the representation of dance synchronized with the MIDI Karaoke .As a result,the authors have achieved to implement "Furikara" feature means the Karaoke with Dance in the Super Bemax's ,a network Karaoke system ,as a main feature. This paper is discribed the method of Karaoke with Dance.

1.Development of flip-chip packaging technology

Kikuiti Satou, Hiroshi Kajiwara, Akinao Adachi, Hisashi Mamiduka


Electronic equipment is required to be miniaturized and more functional. To realize such requests, flip-chip packaging technology has become an indispensable part in the manufacturing process. The technology consists of direct packaging bare IC chips on a printed circuit board.
The authors conducted reliability tests to assess this technology. Test-element-group (TEG) IC chips are mounted experimentally on a build-up substrate by means of three different methods :(1)Anisotropic Conductive Film (ACF) method , (2) Anisotropic Conductive Paste (ACP) method and (3)Non Conductive Resin Paste (NCP) method. Although the number of tests is still limited at present, the authors could draw the contact conditions for materials and minimize the increase of the resulting contact resistance to cope with a high-temperature & high-humidity test (85°C, 85 %, 500 hours) and a thermal shock test (-55°C/25min +125°C/25 min 500 cycles)

2.Development of the adjustment method of optical pickup using the image recognition.

Tsutomu Ichikawa, Makoto Kobayashi


The authors have developed a new optical adjustment method of optical pickup using the image recognition, different from conventional dynamic adjustment method. A photo detector and a laser beam are taken in with the CCD cameras, and processing the images, it can get position information, the distribution and focusing information of the beam.
Shortening and the decrease of the dispersion of the machine time can be expected by developing this method in mass production device.

3.Development and introduced production equipment and jigs for MD pickups

Katsutoshi Tanaka, Yoshiyuki Aoki, Atsushi Tazaki, Tsunetaka Okadera


We developed and introduced production equipment and jigs for MD pickups.We accomplished this considering following items concerning characteristics of MD pickup,miniaturization and high density.Therefore, we have succeeded in actualizing stable production.
  1. Small amount application of adhesives
  2. Prevention of curvature of ACT suspensions
  3. Packaging a flexible PCB at narrow intervals

4.Development of a New Adjustment Method for the Record/Readout Laser Pick-Up.

Tatsuya Iwata, Hayato Chida, Hidekazu Ouchi, Yoshinari Kuwabara


We have developed a new adjustment system for a 4.7 Gb DVD-RW Rewritable Laser Pick-Up unit.By this method, it became possible to directly measure focal shape on the disk surface of the beam emmitted from the pickup, and to adjust it. As compared with the conventional system that uses the playback signal of a test disk, it became possible to adjust to high precision with a less amount of time.

5.Module Assembly Technologies of PDP

Takashi Inaoka


This is to introduce the concrete method and relative attentions of The jointing technology at Module Assemble process, which electricallyconnects the electric circuits, e.g. driver IC, to the electrodes of PDP Glass Panel. And, the evaluation method of connection reliability, the driver IC mounting method, and the on-going challenge of the module assembly Technology are also to be outlined.

6.Testing Technology of Electronics Circuit Board

Kenichi Ogawa, Nobuji Tomita


We have studied a new testing method, named "Collaborative Multi-function test", for assembled print circuit boards. The Collaborative Multi-function test is a complex test which consists of a Boundary scanning test (JTAG), a Function test and a BIST and executing them simultaneously and collaboratively.
We have verified that this test method improves the detection of defects compared to methods which execute these tests independently.

7.A Tryal of Mass Production High-density Mounting PCB

Masato Watanabe


Since Mass production started with mobile phones with the first model in 1996,we have been contributing to introduce new technology of SMT(Surface Mount Technology) at our Kawagoe factory.
For example:
  1. "Mounting of 1005 size chip and inspection of high-density mounting PCB"
  2. "High-precision of fine pich solder paste printing"
  3. "High-reliablity of jointing points what is PCB and elctrode of BGA/CSP"
  4. "Repair and inspectoin technology of PCB mounted BGA/C"

8.A thin and high efficient BACKLIGHT

Koji Kawai, Hideo Yamada, Fumio Shimizu, Takashi Nagashima


For accomplishing the thinnest backlight in the world, along with light-weight and low power LCD keeping high quality images, An ORIGINAL BACKLIGHT has been developed. To be more specific , by the effective improvements of PARTS, for instance, INVERTER, LIGHT, PIPE.Low power has been realized in the LCD. And for materialization of the thinnest LCD, the elimination of BACKLIGHT MODULE-CASE,CO-OUTFRAME of ALUMINUM METAL on PLASTICS and the other methods have been taken. As the result, a 58 inch-wide LCD keeping high quality images has been materialized, the characteristics of which are the thinness of 7 mm, power consumption of 4.8 W, and the luminance of 480 cd/m2.

9.Improvement of solder past printing

Sadayuki Saito


The precision of cream solder printing is strictly influenced on the mounting quality in the SMT processing. On the other hand, the high-speed printing processing is strictly required from the viewpoint of total processing productivity on the SMT. In other words, it is an important subject to create shorten printing time with maintaining highest printing precision.
We have attained 200mm /sec of squeegee speed with the newly developed Urethane Squeegee holder for utilization of squeegee's stable flexibility. In addition, it is well maintained, stable, and has higher printing quality as well.

1.Signal Processing Techniques for a High Density Optical Disc System Employing Multi-Level Pit Edge Recording

Toshio Goto, Hideki Hayashi


For a high density ROM type optical disc, SCIPER/RPR method has been proposed. This is the combination of a single carrier independent pit edge recording (SCIPER) method and a radial direction partial response (RPR) reproduction method. For this system, we have developed signal processing techniques; pit alternating allocation, convolutional code, write pre-compensation, an adaptive equalizer, a carrier canceler, and Viterbi decoding. W e evaluated the data reproduction performance of the system by computer simulation. As a result, we confirmed that a noise margin was improved by 5.4 dB at a bit error rate of 1 × 10-3, and margins against tangential tilt, timing offset, and pit position offset were increased.

Click for Details (PDF 2.31 MB)
in Japanese

2.High density mastering using an electron beam recorder

Masahiro Katsumura, Hiroaki Kitahara, Masakazu Ogasawara, Yoshiaki Kojima, Yasumitsu Wada, Tetsuya Iida, Fumihiko Yokogawa


The purpose to develop an electron beam recorder was to produce a necessary high density optical disk in the next generation DVD system. We have confirmed the following items:

  1. We made stampers in which the recording capacity were 20 Gbytes, 25 Gbytes disks. We reproduced these stampers with the objective lens ofNA=0.75 and using DVD standard EQ. As the results, we obtained 7.7 % jitter in 20 Gbytes disk, and 14.5 % jitter in 25 Gbytes disk.
  2. We recorded 80 nm line and space and 50 Gbytes capacity disk with 6 mrad convergence semi-angle.

The mastering by using an electron beam is a hopeful technique for high-density optical disks.

Click for Details (PDF 662 KB)
in Japanese

3.Study on control of birefringence for a thin disk replication

Tetsuya Imai, Noriyoshi Shida, Keiji Suga, Tetsuya Iida


On a high density thin disk replication process by an injection molding, it is necessary to control and decrease a birefringence value, which has an influence on the disk performance. Therefore we took aim at the thermal stress which was caused the birefringence. And then we studied the relation between the birefringence and the temperature distribution of the mold cabity surface by using the injection molding CAE.

Click for Details (PDF 318 KB)
in Japanese

4.Reduction of The Thickness Variation for a Thin Substrate

Keiji Suga, Tetsuya Imai, Noriyoshi Shida, Tetsuya Iida


It will be necessary to reduce the thickness variation in a substrate on the next generation DVD system.The place where has the thickness variation in a substrate conforms to the bending place of a cooling channel in the molding plate.In the conventional injection molding process, the molding plate warps in the radial direction by the injection pressure.
By the CAE analysis we realized that the warp of the molding plate indicated the minimum value at the bending place of the cooling channel in the molding plate.So we made a new molding plates which has no bending place of the cooling cannel and then tried to same test. As the result, the local thickness variation reduced from 18 μ m to 4 μ m. From the mentioned above, we realized the shape of cooling channel had a relation to the thickness variation of molded substrate.。

Click for Details (PDF 475 KB)
in Japanese

5.Mechanism of Radial Skew Generation of an Optical Disk

Noriyoshi Shida, Keiji Suga, Tetsuya Imai, Tetsuya Iida


It is important to control radial skew in order to realize a high-density optical disk. However, the causes of the radial skew had not been made clear. In this paper we will describe the causes. We also developed a new method to analysis for the radial skew.
By using this method, we found that the temperature difference between a static cavity surface and a moving cavity surface caused the radial skew, which fluctuated on a radius. We also found that a mechanical ejector pushout, and the temperature difference between sprue parts and cutter parts caused the central skew component of the disk. At the same time, we were alsoable to realize that the radial skew was caused by the stumper came from the thermal resistance between the stumper and the cavity.

Click for Details (PDF 673 KB)
in Japanese

6.The technologies of DVD-RW version 1.0

Masahiro Kato, Atsushi Yamaguchi, Eiji Muramatsu, Shoji Taniguchi


In order to develop and establish the physical format of DVD-RW, there were essential technologies to develop, to get the best playback signal characteristics. Therefore, we examined these important items, the write pulse strategy, the optimization of disc substructure, the detection method of pre-formatting signal. This report presents these technologies in the development of the DVD-RW with the examination results of simulation and experiments.

Click for Details (PDF 1.07 MB)
in Japanese

7.Development of DVD-R Disc

Shigenori Murakami, Atsushi Kondo, Miki Kusama, Toshihiko Takishita


4.7GB DVD-R disc corresponding to 650 nm recording wavelength was developed by optimizing dye layer thickness, improving substrate characteristics uniformity in a disc and adopting LPP structure.
65.8 % modulation, 6.26 % Jitter, 53.3 % reflectivity and 5 counts PIER(AVE) were observed with the disc recorded by "basic write strategy " of the "DVD-R for General" specification, and the recorded discs worked on a general DVD players.
A possibility of DVD-R high-speed recording was also found with cyanine type dye.

Click for Details (PDF 1.03 MB)
in Japanese

8.Development of the DVD-RW disc (Cope with Readable Emboss)

Makoto Matsukawa, Seiro Oshima, Takao Tagiri, Toshihiko Takishita


The Current version of the DVD Re-recordable Disc (DVD-RW) specification ver.1.0 does not work with DVD players already been distributed to the market and has a only-one copy management capability. Therefore Readable Emboss was studied to solve those problems from physical point of view.It was necessary to hAVe different depth at emboss area and at groove area to realize the Readable Emboss, and the condition of groove area and of the emboss area and ofthe emboss area was optimized with the V-shaped groove structure, that is made by intermediately exposed photoresist layer. Media layer structure suited for V-shaped groove was also studied.

Click for Details (PDF 592 KB)
in Japanese

9.MD Recorder for Car use

Katsuaki Yamanoi


The authors have developed the "MDR1", a Mini DISC Recorder for Car use.
Although a recorder for Car use was the first trial of Pioneer and it had many issues to solve, with corporation of SHARP, we have developed a recorder that satisfy the required specification for Car use.

Click for Details (PDF 235 KB)
in Japanese

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