Pioneer Electronic Corporation

Pioneer Corporation

Pioneer System Technology Corporation

Tatsuya Fukuda

Hidehiro Ishii

Noriyoshi Takeya

Chiharu Miura

Mitsuo Yasushi

Takashi Iizawa

Takashi Morishige

Kenta Isozaki

Yoshio Aoyagi

Takashi Saito

Kazumi Sugaya

Yoshikazu Takeuchi

Yasunori Suzuki

Osamu Yoshizawa

Hiroshi Wakimoto

Susumu Ohsawa

Akira Kawahara

Kyoichiro Fujii

Munehiko Iwase

Hiroshi Takeya

Kota Kakisaka

Naoki Murakami

A seat includes a seating portion, a backrest, two pairs of vibrators and a vibration absorbing member, and constitutes a driver's seat of a vehicle. The vibration absorbing member is arranged at a boundary portion between a first region and a second region of the seating portion, and is arranged at an intermediate portion between the pair of vibrators. The vibration absorbing member suppresses vibration of the vibrator from being propagated to the second region and vibration of the vibrator from being propagated to the first region. The vibration absorbing member is arranged at a boundary portion between a first region and a second region of the backrest, and is arranged at an intermediate portion between the pair of vibrators. The vibration absorbing member suppresses vibration of the vibrator from being propagated to the second region and vibration of the vibrator from being propagated to the first region.

Seat

A vibration control device which can make a user recognize a vibration by using a plurality of vibration units appropriately is provided. In a first vibration pattern, by interposing a low-vibration period (Ti) between a first standard vibration period (T) and a second standard vibration period (T), a user recognizes more easily a vibration by a vibration unit which vibrates in the second standard vibration period (T). Therefore, even when the user's weight acts on the vibration unit which vibrates in the second standard vibration period (T) lightly, the vibration of this vibration unit is easily recognized.

Vibration control device

A vibration control device is provided which enables an awakening effect for a user to be increased while making it difficult to give discomfort to the user. A harmonic signal generating section of a vibration control device is configured to successively output a plurality of alternating signals for driving a vibration unit. By way of the plurality of alternating signals which is successively output and has a frequency ratio represented with a predetermined integer ratio, vibration generated with the plurality of alternating signals can more easily awaken a user while making it difficult to give discomfort to the user.

The above security device determines whether there occurs screening between a movable body such as a vehicle and a user, and controls the security level in accordance with the determination result. Specifically, the security device sets the security level high when there occurs screening between the movable body and the user, and sets the security level low when there occurs no screening.

Security device, security control method, program, and storage medium

A travel distance estimating apparatus () estimates a travel distance of a moving body in a given section through which the moving body travels (hereinafter referred to as a 'travel interval'). A current position acquiring unit () acquires the current position of the moving body. A variable acquiring unit () acquires information related to the speed of the moving body in the travel interval. An estimating unit () estimates based on a consumed energy estimating equation, energy consumption and a travelable distance for travel through the travel interval. A correcting unit () corrects information related to the moving body and used as variables of the consumed energy estimating equation. A storage unit () stores information related to roads associated with a travel history of the moving body. A display unit () displays map data including information related to travelable distance calculated by the estimating unit ().

Travel distance estimating apparatus, travel distance estimating method, travel distance estimating program, and recording medium

A liquid crystal display includes a plurality of pixels arranged in a matrix. The matrix is formed by five rows and three columns. A pixel at a predetermined position is bisected.

Alphanumeric symbol formed by a 3.times.5 matrix with two longitudinally

A disc playing apparatus having a tracking servo loop and a focus servo loop is configured such that a transfer function of at least one of the servo loops is adjustable. Disc defect detection signals are generated in response to a change in a low frequency component and a high frequency component of a read signal output from the pickup, and the transfer function of at least one of the tracking servo loop and the focus servo loop is adjusted in response to the disc defect detection signals. According to another feature of the invention, the transfer function of at least one of the tracking servo loop and the focus servo loop is gradually changed each time an erroneous jumping movement of the information reading light spot is detected by information contained in the read signal output by the pickup.

Disc player using a servo loop with a variable transfer function

A method for setting the loop gain in a focusing servo loop of a disc player. The loop is opened and the objective lens is moved repeatedly up and down about the focusing point while the disc is slowly rotated, thereby generating an S-shaped focusing error curve. The S-shaped error curve is sampled and a loop gain is determined based on the sampled values. If an eject instruction occurs during the loop gain setting process, a braking pulse is applied to a spindle motor for stopping the disc rotation.

Method for setting the loop gain in a focusing servo loop

In the tracking servo system according to the present invention, the noise removal means for removing a high-frequency noise component contained in the tracking error signal is in an operative state in normal playing operation, while the noise removal means is made to be in an inoperative state at least in an opened state of the servo loop.

Tracking servo system

A disc player operates in a manual search mode in which play and jump operations are alternately repeated, in response to a manual search command, while maintaining the reproducing level at a level lower than the level at the initiation of the manual search command as long as no change command appears. When the change command appears the reproducing level is shifted to a level which is designated by an operator so as to adjust the reproduced sound level to a level sufficient to listen to the reproduced sound for music selection.

Disc player with manual search function

A method of setting the loop gain of a tracking servo loop of a disc player. The optimum loop gain is set for each playing of a disc without being influenced by disc eccentricity. The servo loop is opened, the disc is driven at a revolving speed which is lower than that of normal playback at the current position of the information reading spot, and a tracking error signal is obtained. The loop gain is set on the basis of a plurality of the sample values.

Method for setting the loop gain in a tracking servo loop

A loop gain setting method automatically sets the loop gain of a focus servo loop and a tracking servo loop of a disc player for playing a disc. Firstly the loop gains of the focus servo loop and the tracking servo loop are set, and subsequently the appropriateness of the set values of loop gains is judged by comparing the set values of the loop gains with each other. According to another aspect of the present invention the loop gains of the focus servo loop and the tracking servo loop are set, and subsequently the appropriateness of the set values of loop gains is judged by comparing at least one of the set values of the loop gains with a sensed value of the amplitude of the envelope of an RF signal read-out from the disc.

Method for setting the loop gain of servo loops in a disc player

A servo system for a disc player having a pickup for reading information recorded on an information recording disc, includes an A/D converter for converting an error signal produced on the basis of signals output from the pickup into a digital signal, and performs driving and control of the pick up according to the signal level of the error signal having been processed digitally. The servo system further comprises a filter circuit permitting low frequency components of the error signal to pass therethrough and supplying the low frequency components to the A/D converter, detection circuit detecting noise components having levels higher than a predetermined level, contained in the error signal, and a circuit generating a control signal for a predetermined period after an instant of detection of the noise components by the detection circuit. The filter circuit has a first transmission characteristic with a cut-off frequency below one half of a sampling frequency of the A/D converter when the control signal is absent, and a second transmission characteristic with another cut-off frequency lower than the cut-off frequency when the control signal is present.

Servo system responsive to noise and having variable characteristic

A disc player having digital processing of error signals in a servo system utilizes an A/D converter. The relatively small closed loop error signals are amplified by a predetermined amount above that for the open loop error signals prior to conversion in the A/D converter, and the converter output representing the digitized small error signals are amplified by a predetermined amount below that for the digitized open loop error signals. While the overall gain in the servo system is substantially the same for the closed loop and open loop error signals, the small closed loop error signals are greatly expanded in range at the converter input to permit the same A/D converter to faithfully convert both the open loop and the closed loop error signals.

Growing community of inventors

Saitama, Japan

Tatsuya Fukuda