Honda Motor Co., Ltd.

Dai Nippon Printing Co., Ltd.

Naoto Shibata

Kazuyoshi Irisawa

Tetsuo Shinriki

Tsutomu Kawakatsu

Takafumi Murakami

Tomonori Aoyama

Masafumi Yamamoto

Shouichi Nakao

Masaki Kawamura

Mitsuru Kamikawa

Yutaka Takeuchi

Shunta Osako

Ko Sugai

Kazuya Kumei

Masato Saika

Takahiro Ogura

A drive shaft is configured by joining solid stub shafts formed of a medium carbon steel to both ends of a hollow tubular body formed of a medium carbon steel. When expressed as grain size number, the grain size of the hollow tubular body at joint parts where the hollow tubular body and the solid stub shafts are joined together ranges from #5 to #9, and the grain size of the solid stub shafts at the joint parts ranges from #10 to #12.

Drive shaft and method for producing drive shaft

Disclosed is a ball for a constant velocity joint, and a method for producing the same. The ball for a constant velocity joint is produced via a quenching step for heating a spherical body consisting of a material corresponding to a high carbon chromium bearing steel regulated by Japanese Industrial Standards (JIS) to 840-900&#xb0; C. and then cooling the spherical body under such a condition as 10-25 vol. % of austenite remains up to a first part where the depth from the surface is 0.1 mm, a step for tempering the spherical body at 150&#xb0; C. or more, and a step for shot peening the spherical body and imparting a compression residual stress of &#x2212;1000 MPa or more to a region reaching second part where the depth from the surface is 0.2 mm.

Ball for constant velocity joint and method for producing the same

A constant velocity joint, where the tilt angle of a first trunnion relative to a plane crossing perpendicularly to the axis of a second shaft is set to be different from the tilt angle of a second trunnion and the tilt angle of a third trunnion. The tilt angle of the second trunnion and the tilt angle of the third trunnion are set to be equal to or different from each other, and three axes of the first to third trunnions are set to be included on a same plane.

Constant velocity joint

An annular member is installed on a circular cylinder section of a trunnion, and a roller member, in the inner periphery of which a needle bearing is held, is installed on the circular cylinder section. The needle bearing is held between a flange section formed on one end of the roller member and the annular member installed on the trunnion with a predetermined gap between them. Further, a gap (X) between the needle bearing and the annular member is set to satisfy the following relationship. X&#x3e;R/2&#xb7;(1/cos &#x3b8; max&#x2212;1) where R: Radius of rotation of the center of the roller member relative to the center axis of an outer member. &#x3b8; max: Maximum inclination angle of an inner member.

When in order to enable the use of a plurality of applications (APto AP) simultaneously, preparation commands, having identifiers attached, are provided according to the respective applications and working areas for the respective applications are secured inside a RAM (). By providing a verification command having a specific identifier, a verification process concerning a specific application is performed and a verification result is stored in the corresponding application working area. This verification result is used until the completion of a communication session. To make a specific application execute a desired process, a process executing command that designates an identifier attached to the corresponding application is provided. Adequate security can be ensured and yet a series of linked processes can be performed smoothly while switching among a plurality of application programs in the same communication session.

Portable information recording medium

Switching between a requiring mode and a non-requiring mode of password code checking is enabled by an IC card with a CPU for accessing an EEPROM. The general data in the EEPROM are stored upon attachment of error check codes. The memory area of EEPROM is partitioned into unit areas of 2-byte length and writing is performed according to unit areas. The MSB of a specific unit area Ux is used as a checking requirement flag with '1' being defined as checking 'required' and &#x201c;0&#x201d; being defined as checking &#x201c;not required&#x201d;. In rewriting the checking requirement flag, an erasure process sets all bits in the unit area Ux to &#x201c;1&#x201d; and thereafter the desired flag is set in the MSB.

Portable information processor having password code checking function

Authentification data (R) comprising random numbers generated by a reader/writer () is given to an IC card (), encrypted by utilizing a secret key (a), and returned as encryption data (C). This encryption data (C) is decoded by utilizing an open key (&#x3b2;) to authentify the IC card. A set of past given authentification data (R) is stored in an authentification data storage section (): if another set of given authentification data (R) is the same as the set of past data, an encryption operating section () is prevented from executing an illegal statistical analysis technique by repeatedly giving encrypting operation the same set of authentiification data (R).

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Tokyo, Japan

Naoto Shibata