Abstract: A head mounted display includes a first optical housing mounting a light source and an optical component, a second optical housing mounting an image generating element and an optical component, a securing member connecting and securing the first optical housing and the second optical housing, and an exterior housing holding the first optical housing, the second optical housing, and the securing member. The securing member is fitted with the first optical housing with the second optical housing enclosed to connect and secure the first optical housing and the second optical housing.

Abstract: A terminal display device which a user wears on a user's head displays on a display unit an information object to be overlapped with a field of view of the user, detects a motion of the terminal display device, and stores a pattern of a motion of the terminal display device and an operation content of the information object that is displayed in association with each other. An information type management memory unit stores information related to a display mode of each of the information objects. A display control unit determines an operation content of the terminal display device based on the motion that is detected and an association between the motion pattern and the operation content, specifies the information object disposed at a predetermined position of the display unit, and performs an operation specified with the determined operation content on the specified information object.

Abstract: A head mounted display includes a first optical housing mounting a light source and an optical component, a second optical housing mounting an image generating element and an optical component, a securing member connecting and securing the first optical housing and the second optical housing, and an exterior housing holding the first optical housing, the second optical housing, and the securing member. The securing member is fitted with the first optical housing with the second optical housing enclosed to connect and secure the first optical housing and the second optical housing.

Abstract: A terminal display device which a user wears on a user's head displays on a display unit an information object to be overlapped with a field of view of the user, detects a motion of the terminal display device, and stores a pattern of a motion of the terminal display device and an operation content of the information object that is displayed in association with each other. An information type management memory unit stores information related to a display mode of each of the information objects. A display control unit determines an operation content of the terminal display device based on the motion that is detected and an association between the motion pattern and the operation content, specifies the information object disposed at a predetermined position of the display unit, and performs an operation specified with the determined operation content on the specified information object.

Abstract: An information recording apparatus for an optical information disk includes a recording position determining unit that determines a recording position on the optical information disk; and a recording and reproducing unit that performs recording and reproduction on the optical information disk. The recording position determining unit determines recording positions for all or some areas of the optical information disk, and the recording and reproducing unit records data at the recording positions on the optical information disk determined by the recording position determining unit.

Abstract: An information recording apparatus for an optical information disk includes a recording position determining unit that determines a recording position on the optical information disk; and a recording and reproducing unit that performs recording and reproduction on the optical information disk. The recording position determining unit determines recording positions for all or some areas of the optical information disk, and the recording and reproducing unit records data at the recording positions on the optical information disk determined by the recording position determining unit.

Abstract: It takes time to read management information and the like from a recording layer in starting reproduction of an optical disc, thus posing a problem of poor usability. Moreover, a light beam needs to be largely moved in a radial direction in recording or reproducing the next layer, thus posing a problem that the time to interrupt recording or reproduction increases. The above-described problems can be resolved by enabling a reference layer to be recorded and reproduced, and recording disc management information and the like in this reference layer, and reproducing this information. Moreover, the reference layer comprises two layers having the spiral directions of the track different from each other, and the reference layer, on which a light beam is focused, is changed according to a layer to be recorded or reproduced in the recording layer.

Abstract: An optical disc apparatus, being improved in a random access speed thereof and superior in a usability thereof, comprises: a virtual disc for memorizing data of at least one (1) pieces of an optical disc; a recording/reproducing means for executing reproduction of data from the optical disc and recording of data onto the optical disc; and a system controller means for controlling the virtual disc and the recording/reproducing means.

Abstract: An optical disc apparatus having a construction that lowers a peak value of a laser beam applied to an optical disc and controls a current supplied to the laser. Provisions are made to prevent recorded marks on the optical disc from degrading by utilizing the laser beam radiated onto the optical disc. Provisions are also made to minimize gradual deterioration of the laser itself that would otherwise be caused by the emission of laser beam, to minimize unwanted radio waves that would otherwise be produced from the optical disc apparatus by the emission of laser beam, and to prevent the responsiveness of the optical disc apparatus from being impaired.

Abstract: A recording/playback device includes an information conversion unit converting video or audio information, received from an external source, to video or audio data for recording on a rewritable optical disk, a recording unit recording the video or audio data on said optical disk, and a playback unit playing back the video or audio data recorded on said optical disk, in which the optical disk has at least two recording layers and, when the video or audio data is recorded in two or more layers of the optical disk and then a part of the video data or audio data recorded in each layer is erased, a part of the video or audio data left unerased is moved so that a number of layers, in which the video or audio data left unerased is recorded, is reduced.

Abstract: A recording/playback device includes an information conversion unit converting video or audio information, received from an external source, to video or audio data for recording on a rewritable optical disk, a recording unit recording the video or audio data on said optical disk, and a playback unit playing back the video or audio data recorded on said optical disk, in which the optical disk has at least two recording layers and, when the video or audio data is recorded in two or more layers of the optical disk and then a part of the video data or audio data recorded in each layer is erased, a part of the video or audio data left unerased is moved so that a number of layers, in which the video or audio data left unerased is recorded, is reduced.

Abstract: When, in the course of recording data to a disk for each basic recording unit, the recording is stopped in the middle of a basic recording unit, data of the basic recording unit of the recording that was stopped remain held in memory. When recording resumes, the recording operation is restarted sequentially from the remaining data held in memory from the position at which recording was stopped. When the remaining data cannot be recorded, dummy data are recorded instead and playback is performed, skipping the dummy data section.

Abstract: A rotation control method of a disc and a video camera using such a method in the video camera having an optical disc drive therein, wherein a vibration occurring due to the rotation of a disc when data is recorded to the disc during photographing is suppressed, an electric power which is consumed by the disc drive is reduced, a real-time recording is accomplished, and quality of the data which is recorded to the disc is not deteriorated. In the video camera, the disc drive is intermittently driven and a rotational speed of the disc and timing for switching the rotational speed of the disc are controlled.

Abstract: A video camera with a disk drive capable of recording and reproducing operations with stability and silence achieved by suppressing vibration and noise caused by disk rotation. The number of revolutions of the disk is controlled according to states of the video camera. The disk drive comprises a disk rotation control unit for rotating the disk at an optional number of revolutions under rotation control and an adjusting process unit for recording data on the disk, in which one or both of the disk rotation speed and the rotation control method are changed by using an adjusting process executed in a period when recording is performed and the adjusting process executed in a period when recording is not performed.

Abstract: An optical disc apparatus having a construction that lowers a peak value of a laser beam applied to an optical disc and controls a current supplied to the laser. Provisions are made to prevent recorded marks on the optical disc from degrading by utilizing the laser beam radiated onto the optical disc. Provisions are also made to minimize gradual deterioration of the laser itself that would otherwise be caused by the emission of laser beam, to minimize unwanted radio waves that would otherwise be produced from the optical disc apparatus by the emission of laser beam, and to prevent the responsiveness of the optical disc apparatus from being impaired.

Abstract: In a user data area, control of recording laser power cannot be performed accurately. In recording data in the user data area, data for the control of recording laser power is also recorded together with user data to be recorded. By reproducing the data for control of recording laser power, the recording laser power can be controlled to be suitable for a user data recording position and user data is recorded with use of the thus-controlled laser power. In this way the recording laser power can be controlled to be suitable for a recording position on an optical disc and hence an optical disc superior in recording quality is realized.

Abstract: Because a series of data is recorded continuously, the recording quality of data recorded in course of recording cannot be evaluated. Accordingly, the laser output cannot be controlled properly and there are a deterioration and dispersion of the recording quality. Further, when the recording lasts for a long time, the temperature in the vicinity of laser rises due to the heat from the inside of a disc drive and the recording quality is deteriorated. To solve this, a series of data to be recorded is split and recording is made intermittently in a split data unit. The recording quality is evaluated by reproducing the data recorded nearby before each split data is recorded using a duration and control is performed by reflecting the evaluation result in the laser output so that the recording quality can be maintained satisfactorily over a series of the whole data to be recorded.

Abstract: Some conventional optical disc apparatuses must continuously perform a recording operation if they continuously receive data from the host apparatus, which eliminates the opportunity for them to perform necessary internal adjustments during the recording operation. Other conventional optical disc apparatuses can perform internal adjustments even if they continuously receive data from the host apparatus. However, they may need to use an inappropriate disc area to make such adjustments. The present invention has been devised to solve these problems. The present invention provides a method for recording data on a disc which allows an optical disc apparatus to perform necessary internal adjustments during a recording operation even if it continuously receives data from the host apparatus during that operation. Further, the present invention also provides an adjustment method that allows an optical disc apparatus to perform adjustments using an appropriate area on the disc.

Abstract: Processing to confirm management information during starting processing of a disk device is completely executed in a short period of time without scanning a data area to thereby minimize the period of time for the starting processing. The management information confirming processing can be executed after the disk device notifies the condition to the host or the user. Therefore, the response characteristic of the disk device is improved. Authentication information to certify that management information recorded on a disk is valid and invalidating information to invalidate the authentication information are provided. When the invalidating information to invalidate the authentication information is present, it is possible to determine that the management information is invalid or is possibly invalid. When the invalidating information to invalidate the authentication information is absent, it is possible to determine that the management information is valid according to the authentication information.

Abstract: A disc device in which recording is possible in a basic recording area in units of a subarea and startable at any position. Even if the recording cannot help stopping due to some external cause during recording on a disc-type recording medium that basically employs real-time sequential recording, the recording is re-openable at the position where the recording stopped when the external cause has disappeared. The disc device includes a reference clock counter that starts to count at the starting point of each basic recording area reference clocks read from the disc, and an address memory that holds an address of the basic recording area under recording. When the recording is stopped due to some external cause, the count of the counter and the address held by the address memory at that time are saved.