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Hiromichi Ishibashi, Motoyuki Kobayashi, Mitsurou Moriya: Jitter measurement apparatus detecting amplitude of phase errors between information signal and synchronized clock signal. Matsushita Electric Industrial, Renner Otto Boisselle & Sklar, September 2, 1997: US05663942 (66 worldwide citation)

A read-out information signal read out from an optical disk carrier is digitized, thereby detecting an amplitude of an absolute value of a phase error between the read-out information signal and a synchronized clock signal. The synchronized clock signal is obtained by using a phase locked loop const ...


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Noriaki Wakabayashi, Hiromichi Ishibashi: Optical disk drive apparatus. Matsushita Electric Industrial, Wenderoth Lind & Ponack, May 26, 1987: US04669073 (45 worldwide citation)

An optical disk drive apparatus, for data or information disks of which the data or information are able to record or playback on each of the recording tracks, comprises an optical rotary pick-up head actuator for both seeking and following to the recording track to read or write data signals by a l ...


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Shinichi Tanaka, Hiromichi Ishibashi, Mitsurou Moriya, Shinichi Kadowaki: Recording medium, a method for producing the same, a control method using the recording medium, and a recording/reproducing apparatus using the recording medium. Matsushita Electric Industrial, Renner Otto Boisselle & Sklar P L L, September 29, 1998: US05815485 (35 worldwide citation)

A disk-shaped recording medium includes a plurality of first tracks and a plurality of second tracks for recording data, the first track and the second track being alternately arranged in the radial direction on the surface of the recording medium in one of a pattern of concentric circles and a spir ...


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Hiromichi Ishibashi: Optical disk drive having functions of detecting disk tilt from difrraction pattern of track and compensating disk tilt with use of comatic lenses. Matsushita Electric Industrial, Renner Otto Boisselle & Sklar, June 4, 1996: US05523989 (34 worldwide citation)

An optical disk drive of the present invention includes: a light source for emitting a light beam; an optical system for radiating the light beam onto a desired track formed on an optical disk; a light receiving element for receiving the light beam reflected by the optical disk; and a signal process ...


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Harumitsu Miyashita, Hiromichi Ishibashi, Shinichi Tanaka, Takashi Yumiba: Optical disc, and recording apparatus, recording method, and reproducing apparatus for the same. Matsushita Electric Industrial, Wenderoth Lind & Ponack L, May 11, 2004: US06735160 (27 worldwide citation)

An optical disc recording apparatus records a digital content onto an optical disc so that the perfect copying of the digital content is difficult without proper authorization. The optical disc recording apparatus includes a formatter for generating a channel signal corresponding to primary digital ...


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Hiromichi Ishibashi, Shinichi Tanaka, Ryosuke Shimizu, Makoto Kuwamoto, Hajime Yamamoto: Optical disc drive apparatus. Matsushita Electric Industrial, Wenderoth Lind & Ponack, August 2, 1988: US04761774 (26 worldwide citation)

An optical disc drive apparatus has a remarkably improved track accessing ability in comparison with conventional like apparatus. On a base are provided an optical system having a light emitting element and a light sensing element, as well as an optical path deflecting element which performs a preci ...


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Shinichi Tanaka, Hiromichi Ishibashi, Akira Mitsubara, Tsuyoshi Okada: Digital modulator and demodulator. Matsushita Electric Industrial, Wenderoth Lind & Ponack, May 14, 1991: US05016258 (25 worldwide citation)

A digital modulator converts M-bit data words to N-bit code words (N>M) each containing a specific number of bits `1`. The specific number is one of a plurality of predetermined numbers which are different by at least 3 from one another. A specific data word may be converted to either one of two cod ...