Abstract: An optical disk drive (101) for optically recording and/or reproducing information signals is provided in which the power of a light beam emitted from an optical head (104) to an optical disk (102) is controlled by an optical-coupling efficiency varying elements (214, 215) correspondingly to the type of the optical disk, recording layer in a multilayer optical disk and a mode of operation selected while a variation of the optical-coupling efficiency is being detected by a light-detecting element (216), thereby positively varying the optical-coupling efficiency in a minimum necessary time. Thus, the power of the light beam focused on the optical disk can be varied in a wide range without having to extremely raise the ratio in output power between modes of operation at a light source (212).

Abstract: The present invention provides an optical disc camcorder unit having a base plate assembly loaded with an optical disc and a camcorder main body accommodating the base plate assembly, the base plate assembly is swingably set to the camcorder main body via a rotating shaft so that the base plate assembly rotates in an axial direction about the rotating shaft. In this manner the optical disc camcorder provides improved recording and reproduction characteristic and improved tracking performance by way of preventing rolling generated by in the camcorder unit from being transmitted to internal base plate assembly and also preventing skew and oscillation of spindle motor shaft from being generated.

Abstract: An optical head in which pre-formatted signals may be detected as variations in the amplitude or the phase in the pre-formatted signals are suppressed, and a recording and/or reproducing apparatus employing the optical head, are disclosed. The optical head includes a light source 212, an objective lens 220 for condensing a light beam radiated from the light source 212 on a recording track of an optical recording medium 102, and a photodetector unit 223 for receiving the light beam reflected back from said recording track. The photodetector unit 223 includes a first light receiving section 230b and a second light receiving section 230c.

Abstract: The present invention is directed to an optical head adapted for performing recording or reproduction of information signals with respect to an optical disc (102), which controls light coupling efficiency with respect to light beams irradiated onto the optical disc (102) by light coupling efficiency adjustable element such as a liquid crystal element (214), etc. in accordance with type of the optical disc (102), recording surface of multi-layer optical disc and/or operation mode to change power of light beams irradiated onto the optical disc (102) to a large extent without excessively increasing change quantity of output power of a semiconductor laser element (212). A beam splitter (218) divides incident light beams of P-polarized light at a predetermined ratio to allow the light beams thus obtained to be incident on a light detector (219) for disc surface power monitor.

Abstract: An optical disk drive (101) for optically recording and/or reproducing information signals is provided in which the power of a light beam emitted from an optical head (104) to an optical disk (102) is controlled by an optical-coupling efficiency varying elements (214, 215) correspondingly to the type of the optical disk, recording layer in a multilayer optical disk and a mode of operation selected while a variation of the optical-coupling efficiency is being detected by a light-detecting element (216), thereby positively varying the optical-coupling efficiency in a minimum necessary time. Thus, the power of the light beam focused on the optical disk can be varied in a wide range without having to extremely raise the ratio in output power between modes of operation at a light source (212).

Abstract: The present invention is directed to an optical head adapted for performing recording or reproduction of information signals with respect to an optical disc (102), which controls light coupling efficiency with respect to light beams irradiated onto the optical disc (102) by light coupling efficiency adjustable element such as a liquid crystal element (214), etc. in accordance with type of the optical disc (102), recording surface of multi-layer optical disc and/or operation mode to change power of light beams irradiated onto the optical disc (102) to a large extent without excessively increasing change quantity of output power of a semiconductor laser element (212). A beam splitter (218) divides incident light beams of P-polarized light at a predetermined ratio to allow the light beams thus obtained to be incident on a light detector (219) for disc surface power monitor.

Abstract: An optical head in which pre-formatted signals may be detected as variations in the amplitude or the phase in the pre-formatted signals are suppressed, and a recording and/or reproducing apparatus employing the optical head, are disclosed. The optical head includes a light source 212, an objective lens 220 for condensing a light beam radiated from the light source 212 on a recording track of an optical recording medium 102, and a photodetector unit 223 for receiving the light beam reflected back from said recording track. The photodetector unit 223 includes a first light receiving section 230b and a second light receiving section 230c.

Abstract: A production instruction volume decision support method comprising the steps of: creating a plurality of sets of amount of the production order; obtaining a plurality of evaluation values based on simulation of demand for each product; obtaining a superiority relationship among the sets of amount of the production order from the evaluation values; creating a new set of amount of the production order from two sets of amount of the production order which are superior to the other sets of amount of the production order; repeating the above steps a predetermined number of times to obtain solutions to the plurality of sets of amount of the production order which have been optimized; displaying a plurality of sets of amount of the production order which have nothing superior thereto; and enabling a user to select one of them according to his/her management policy.

Abstract: A production instruction volume decision support method comprising the steps of: creating a plurality of sets of amount of the production order; obtaining a plurality of evaluation values based on simulation of demand for each product; obtaining a superiority relationship among the sets of amount of the production order from the evaluation values; creating a new set of amount of the production order from two sets of amount of the production order which are superior to the other sets of amount of the production order; repeating the above steps a predetermined number of times to obtain solutions to the plurality of sets of amount of the production order which have been optimized; displaying a plurality of sets of amount of the production order which have nothing superior thereto; and enabling a user to select one of them according to his/her management policy.

Abstract: A current detector detects a driving current Im flowing through a light emitting device (laser diode); a temperature sensor is arranged in the vicinity of the light emitting device; a microcomputer is supplied with the outputs of the current detector and temperature sensor; a temperature correction coefficient specific to the light emitting device, obtained based on a driving current value IT1 at a temperature T1 and a driving current value IT2 at a temperature T2 (>T1), is stored in memory; a deterioration threshold current Id for a detected temperature Ti is calculated; and when the deterioration threshold current Id for the detected temperature Ti is exceeded by the detected current, a driver is controlled so as to inhibit the supply of the driving current to the light emitting device. Since the operating temperature also is taken into consideration, deterioration of the light emitting device can be accurately estimated, thereby preventing erroneous recording/reproduction of data.

Abstract: An apparatus for recording a signal on a disc medium driven by a servo circuit comprises, device for generating a laser beam for recording the signal on the disc medium, device for detecting a track jump of a scan of the disc medium by the laser beam, device for storing the signal during an occurrence of the track jump, and controller for controlling the laser beam generating device, track jump detecting device and storing device so that a recording operation by the laser beam is stopped during the occurrence of the track, and the signal stored in the storing device is recorded on a predetermined area of the disc medium after the record operation becomes to be possible.

Abstract: In a sampled data transmitting apparatus in which the sampled data to be transmitted are divided into odd-numbered samples and even-numbered samples and arranged in different rows of a two-dimensional data array, and in which error correction codes are annexed to each row and to each column of the two-dimensional data array, the row arraying sequence in one of the odd-numbered or even-numbered rows is caused to differ from the row arraying sequence in the other of the odd-numbered or even-numbered rows so that odd-numbered data and even-numbered data continuous with the odd-numbered data are not arranged in one row. In this manner, even when error correction becomes impossible by the error correcting code for one row, interpolation remains feasible because there exist no odd-numbered data or even-numbered data contiguous to each other in the row.

Abstract: A disk recording and reproducing apparatus using two light beams has a disk driving section for loading a disk-shaped record medium having recording tracks and for rotating the disk-shaped record medium, an optical system having a light beam generating source, a light beam splitting device for splitting a light beam to provide at least a main beam and a sub beam, an optical path forming device for respectively causing the main beam and the sub beam to become incident on two adjacent recording tracks in the disk-shaped record medium loaded on the disk driving section and a photo-detecting device for detecting the condition that at least the sub beam from the disk-shaped record medium loaded on the disk driving section is affected by the recording track.

Abstract: An optically writable record of digital information is provided on an optically writable record disk having a reflection factor substantially higher than seventy percent, and is composed of first digital information including a plurality of program data and respective address data indicative of the individual addresses of the respective program data and being recorded with the latter sequentially along a first track in a first annular recording area of the record disk, and second digital information including table-of-contents data, identifying the plurality of program data, respectively, and being recorded sequentially along a second track which is in a second annular recording area of the record disk and which has a concluding end contiguous to a starting end of the first track so that, upon playback of the digital information record, the table-of-contents data and the plurality of program data and respective address data can be reproduced successively without interruption by a standardized compact disk pla

Abstract: In a tape recorder of the type having a first or drive gear rotatable with the capstan by a motor, a second or driven gear rotated by the drive gear when in meshing engagement therewith and having a toothless portion to permit rotation of the drive gear independently of the second gear when the latter is disposed in a rest position with its toothless portion facing the first gear, an actuator in the form of a cam rotatable with the second gear and engaging a lever by which, for example, a head carriage is moved to its operative position for establishing the playback mode of the tape recorder in response to turning of the second gear, and a latching assembly normally holding the second gear in its rest position and being actuable, for example, for selection of the playback mode, to permit angular displacement of the second gear from its rest position into meshing engagement with the first or drive gear so as to be driven by the latter in a substantially complete revolution whereupon the latching assembly again