Victor Company of Japan, Limited

Jvc Kenwood Corporation

Other

Matsushita Electric Industrial Co., Ltd.

Yasuhiro Ueki

Yutaka Osada

Makoto Usui

Naoto Hirohata

Hideharu Eguchi

Mikio Okumura

Nobuyoshi Yamagishi

Kohjyu Konno

Takuya Kakinuma

Kenji Koishi

Hiroshi Tabata

Ichiro Ueno

Yuuichi Kamioka

Kazuo Yonehara

Toru Fujimoto

Atsushi Hosoda

Takeshi Aizawa

Osamu Yanagisawa

Hideaki Yamagami

Takashi Saito

Shuji Takahashi

Hironori Deguchi

Chikashi Inokuchi

Yoshiyuki Miyabata

Tomonori Ueno

Hiroshi Nishiumi

Takahiro Ochi

Mitsuhiko Ohta

Hiroyuki Ishida

Shinji Irioka

A mark having a length nT (n being an integer equal to or greater than 3 and T being a clock period) is formed by modulating irradiation laser power with three values of recording power Pw, erase power Pe, and bias power Pb (Pw&#x3e;Pe&#x3e;Pb). Constant strength periods (A) of the recording power Pw are set as AT, AT, . . . , and AT and constant strength periods (B) of the bias power Pb are set as BT, BT, . . . , BT, and CT (C=&#x2212;1 to 3). The application of laser is divided into pulses in order of AT, BT, AT, BT, . . . , AT, BT, and CT (m=(n&#x2212;k)/2, k=3 (if n is an odd number), or k=4 (if n is an even number)). (Here, the constant strength period of the recording power Pw for n=3, n=4, n&#x2267;5 (odd number), and n&#x2267;6 (even number) is set as A, A, A, and A, the constant strength period of the bias power Pb for n=3, n=4, n&#x2267;5 (odd number), and n&#x2267;6 (even number) is set as B, B, B, and B, and then, A+B=A+B=A+B=2T and A+B=A+B=3T).

Optical recording method, optical recording medium, optical recording medium recording apparatus, optical recording apparatus, optical disk, and optical disk recording/reproducing apparatus

A backlight device wherein LEDs which are arranged side by side at a first arrangement interval (P1) are provided to each LED unit. The LED units are mounted to a flexible board at a second arrangement interval. A light guide plate is disposed in such a manner that an end surface thereof is spaced from the LEDs by a distance (H). The light guide plate is disposed so as to satisfy the following relationship: first arrangement interval (P1)&#x3c;distance (H)&#x3c;second arrangement interval (P2). Specifically, the LEDs are arranged side by side in such a manner that the first arrangement interval (P1) is not less than 0.1 mm but not greater than 3 mm and the second arrangement interval (P2) is not less than 5 mm but not greater than 15 mm. The light guide plate is disposed in such a manner that the distance (H) is not less than 1 mm but not greater than 7 mm.

Backlight device

A disc-shaped information recording medium includes a laminate of recording layers on and from which an information signal can be optically recorded and reproduced from one side of the medium. Data areas are provided in the recording layers, respectively. The information signal can be recorded on and reproduced from the data areas while a laser beam emitted from an optical pickup is applied to the data areas. Optical recording test areas are provided in the recording layers, respectively. A test signal can be recorded on and reproduced from the optical recording test areas to decide optimum power values of the laser beam for signal recording. The test areas are out of overlap as viewed in a direction of propagation of the laser beam.

Apparatus for reproducing a signal from a disc-shaped information recording medium having a plurality of recording layers with different areas

A backlight device wherein LEDs which are arranged side by side at a first arrangement interval (P) are provided to each LED unit. The LED units are mounted to a flexible board at a second arrangement interval. A light guide plate is disposed in such a manner that an end surface thereof is spaced from the LEDs by a distance (H). The light guide plate is disposed so as to satisfy the following relationship: first arrangement interval (P)&#x3c;distance (H)&#x3c;second arrangement interval (P). Specifically, the LEDs are arranged side by side in such a manner that the first arrangement interval (P) is not less than 0.1 mm but not greater than 3 mm and the second arrangement interval (P) is not less than 5 mm but not greater than 15 mm. The light guide plate is disposed in such a manner that the distance (H) is not less than 1 mm but not greater than 7 mm.

An information recording medium in which bottoms of a guide groove and a pit array formed on a disc substrate are allocated on a same flat plane and shaped in flat. Further, in a transition area from a pit array to a guide groove or from a guide groove to a pit array, the information recording medium is provided with an intermediate area composed of a pit array of which height changes from a height between a bottom and a side of a groove to another height between the bottom and a side of the pit array.

Information recording medium, and recording method and reproducing method thereof

An information recording medium includes a lead-in area and a data area for storing contents information. The lead-in area includes a first lead-in information area and a second lead-in information area. The first lead-in information area corresponds to a first playback mode. The second lead-in information area corresponds to a second playback mode different from the first playback mode. The first lead-in information area has a first depth and is designed for storing lead-in information related to the contents information stored in the data area. The second lead-in information area includes pre-pits having a second depth greater than the first depth. The pre-pits represent predetermined information, such as information of copyright protection, related to the contents information stored in the data area.

Information recording medium, method and apparatus for recording and reproducing information

A video data recording device for sufficiently protecting privacy even before a mask target enters into a screen. The video data recording device includes a reference information storage unit in which reference information including predetermined features is recorded; a video data acquisition unit which acquires video data and sequentially outputs the video data to a video buffer; a similarity determining unit which compares newest video data and the reference information, and extracts partial information determined to be similar to the reference information from the newest video data; a relation determining unit which compares video data output to the video buffer before the newest video data, and the partial information determined to be similar, and extracts partial information determined to be related to the partial information determined to be similar; and an imaging recording I/F unit which records the video data and the related information related to the partial information in a recording medium.

Video data recording device, video data playing device, video data recording method, and video data playing method

A backlight device wherein LEDs which are arranged side by side at a first arrangement interval (P) are provided to each LED unit. The LED units are mounted to a flexible board at a second arrangement interval. A light guide plate is disposed in such a manner that an end surface thereof is spaced from the LEDs by a distance (H). The light guide plate is disposed so as to satisfy the following relationship: first arrangement interval (P)&#x2266;distance (H)&#x2266;second arrangement interval (P). Specifically, the LEDs are arranged side by side in such a manner that the first arrangement interval (P) is not less than 0.1 mm but not greater than 3 mm and the second arrangement interval (P) is not less than 5 mm but not greater than 15 mm. The light guide plate is disposed in such a manner that the distance (H) is not less than 1 mm but not greater than 7 mm.

Method of recording information on a recording medium including the recordation of a test signal thereon

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Sagamihara, Japan

Yasuhiro Ueki