TRIZ Case Study :


Introduction of the Activity to Promote TRIZ for Engineer and its Application Examples in Hitachi GST
Toshihiro Arisaka, Kazushi Tsuwako, Hiroyuki Suzuki (Hitachi Global Storage Technologies Japan, Ltd. )
Presented at The Third TRIZ Symposium in Japan, Held at TOSHIBA Kenshu Center, Yokohama, on Aug. 30 - Sept. 1, 2007
[Posted on Mar. 9, 2008]  Under the permission by the Authors.   

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Editor's Note (Toru Nakagawa, Feb. 29, 2008)

The paper posted here was originally presented last August at The Third TRIZ Symposium in Japan held at TOSHIBA Kenshu Center, Yokohama.  The paper was presented in a poster session on the third day afternoon.  I have reviewed this presentation in my 'Personal Report of The Third TRIZ Symosium in Japan, 2007' .  The first paragraph in my introduction, and then the last one are as follows:

This presentation contains 3 topics. 
(1) For making TRIZ easy to access for engineers working in the field of HDD (Hard Disk Drive), technical terms in HDD area are interpreted with the parameters in the Contradiction Matrix and application examples in HDD area are listed corresponding to 40 Inventive Principles. 
(2) Actual TRIZ application: An error recovery mechanism using low RPM operation. 
(3) Another actual TRIZ application: New design in an actuator mechanism. 
All the three topics are valuable, but here I will cite the topic (3).

*** This presentation shows a steady way of penetrating TRIZ in a specific field, i.e. HDD technologies in the present case. 

This page in English contains the followings:

[1] Extended Abstract (by the Author)

[2]  Nakagawa's introduction: Excerpt of my 'Personal Report of Japan TRIZ Symosium 2007'  

[3] Presentation slides in PDF (16 slides, 2 slides/page, 493 KB) )   

Whereas in the Japanese page , we have (1) Extended Abstract (by the Author), (2) Full paper, and (3) Presentation slides.

 
Top of this page Extended Abstract Nakagawa's introduction Slides in PDF (493 KB) Japanese Slides PDF Japan TRIZ Symposium 2007 (Nakagawa Personal Rept.) Japanese page

 


[1] Extended Abstract

Introduction of the activity to promote TRIZ for engineer and
its application examples in Hitachi GST

Toshihiro Arisaka, Kazushi Tsuwako, Hiroyuki Suzuki
Hitachi Global Storage Technologies Japan, Ltd.

Abstract

The activities to promote TRIZ was started two years ago in Hitachi GST. Some seminars and events by the visiting lecturer were held for research/development engineers. Mainly we focused on Contradiction Matrix for the TRIZ beginners. And we found that most of all beginners had some troubles when they tried to translate their business technical parameters to Contradiction Matrix’s parameters. So the correlation table between the business technical parameters and the Contradiction Matrix parameters has been made to solve their problems.
In this paper, the activities to promote TRIZ for research/development engineers and their application examples are reported.

Extended Abstract

In Hitachi Global Storage Technologies, Ltd., the development of hard disk drives (HDD) and manufacturing are carried out. The engineers and researchers are discussing about their technical problems by using their own key business technical words, for example, error rate, seek time, and track per inch, etc. When the engineers, which are TRIZ beginner in same time, would apply the Contradiction Matrix to their technical problem, they feel that it is trouble to generalize their own business technical parameters into the Contradiction Matrix’s parameters. The correlation table between the business technical parameters and the Contradiction Matrix’s parameters has been made in order to eliminate this trouble.

In our report, two examples of TRIZ application on the technical problems in the HDD development are shown.

1. Low RPM Error Recovery

The magnetic head slider flies on the magnetic disk with several nm spacing in HDD. When the spacing between the head slider and disk becomes smaller, the magnetic recording signal quality becomes better. But it also causes the increase of potential of the signal noise increase by nano-size asperities. The idea generation of the error recovery method for this problem was supported by the application of the Contradiction Matrix.

2. Actuator design for high accuracy head positioning

The improvement of the transfer function of actuator is needed in the development of the head positioning actuator for high accuracy servo system. The example of invention of the new design strategy by the breakthrough of “psychological inertia” is shown. It is shown that the function graph is applied to the design flow of the actuator by using the classical TRIZ tool.

Table: The example of the correlation table between the technical words and the Contradiction Matrix’s parameters

Key Word of HDD parameter TRIZ 48 Parameters
Bit length on the Disk Length of stationary object(4)
Error Rate Loss of Time (26)、Loss of Information (28)
Seek Time Duration of Action of Moving Object (12)
Weight Saving Weight of Stationary Object (2)
Sound Noise(29)
Thermal Stability Stability(21)
Track Per Inch Information (11)

Presenter's Profile: Toshihiro Arisaka, PhD.

Senior project manager of mechanics and servo technology development, Advanced HDD Technology Laboratory, Hitachi Global Storage Technologies Japan, Ltd.

 

[2] Introduction & Review of the Presentation (Toru Nakagawa (OGU), Nov. 14, 2007)

Excerpt from Nakagawa's 'Personal Report of Japan TRIZ Symposium 2007' (posted on Nov. 18, 2007). 

Toshihiro Arisaka, Kazushi Tsuwako, Hiroyuki Suzuki (Hitachi Global Storage Technologies Japan, Ltd. ) [35] gave a poster presentation with the title of "Introduction of the Activity to Promote TRIZ for Engineer and its Application Examples in Hitachi GST".  This presentation contains 3 topics.  (1) For making TRIZ easy to access for engineers working in the field of HDD (Hard Disk Drive), technical terms in HDD area are interpreted with the parameters in the Contradiction Matrix and application examples in HDD area are listed corresponding to 40 Inventive Principles.  (2) Actual TRIZ application: An error recovery mechanism using low RPM operation.  (3) Another actual TRIZ application: New design in an actuator mechanism.  All the three topics are valuable, but here I will cite the topic (3).

The following slide shows the problem situations.  In the actuator design we have a request of better control of the head position in the servo feedback system.  (Sorry but I cannot follow the logic exactly.)

Thus the typical way of thinking traps the engineer in a 'Psychological Inertia'.  Thinking the question 'What is truly needed?' breaks this trap of PI.

The new target of designing 'Zero head displacement' has lead the engineer to remind of the '4-link structure'. Using this structure and placing the head at the 'dynamic rotational center', the zero head displacement is achievable.  The new design with hinges at the corners of the 4-link structure was implemented in the product.

*** This presentation shows a steady way of penetrating TRIZ in a specific field, i.e. HDD technologies in the present case. 

 


[3] Presentation Slides

Presentation Slides (in English)   (PDF, 493 KB, 16 slides, 2 slides/page)  Click Here. 

 


[4] Links to the Japanese Pages

Japanese page

Full Paper in Japanese   (PDF, 283 KB, 6 pages)

Pesentation Slides in Japanese   (PDF, 189 KB, 16 slides, 2 slides/page)

 

Top of this page Abstract Nakagawa's introduction Slides in PDF (114 KB) Japanese Full Paper PDF Japanese Slides PDF Japan TRIZ Symposium 2007 (Nakagawa Personal Rept.) Japanese page

 

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Last updated on Mar. 9, 2008.     Access point:  Editor: nakagawa@ogu.ac.jp