Abstract: An optical recording medium comprises a substrate layer formed with a plurality of grooves having a pitch of 0.7-0.9 .mu.m, further with a plurality of prepits located between the grooves and separated from each other at a predetermined interval; a recording layer formed on the substrate layer. The optical recording medium is adapted for recording and reproducing information by directing a laser beam (having a wavelength of 600-700 nm) through an objective lens (having an numerical aperture of 0.55-0.70), further through the substrate layer so as to converge the beam on the recording layer. In particular, the plurality of grooves are different from the plurality of prepits in depth and/or width.

Abstract: In a method for manufacturing a master disc for optical discs, patterns to be displayed on the disc are classified into a main object and a background. The background is commonly assigned as the background pattern for glittering rainbow colors by diffracted light reflected from dummy pits of diffraction gratings or a hologram. The main object is individually assigned as the main object pattern of a diffused reflection portion or mirror surface. The manufacturing method comprises one group of steps for forming the common background pattern and the other group of steps for forming the individual main object pattern in the common background pattern. A development substrate for the master disc is formed by using a mask disc in a first light-exposure of a photoresist layer thereof and by using a displaying-pattern mask in a first light-exposure of the photoresist layer. The individual main object pattern is drawn in the common background pattern of the master disc by using a laser-marking or an etching.

Abstract: A device for editing information includes: a device for encoding a plurality of unit information each having a predetermined length and outputting the coded unit information consecutively at a first rate; a device for generating additional information to be added to the unit information; a plurality of editing devices for storing the unit information encoded by the encoding device and processing the unit information stored and the additional information in a parallel manner with each other at a second rate different from the first rate, respectively; a device for selectively supplying the unit information outputted by said outputting device to one of the editing device; and a device for detecting the editing unit which is not performing the processing and permitting the supplying device to supply a new unit information to the editing unit thus detected when said outputting device outputs the new unit information.

Abstract: A recording disk carrying a compressed video signal at a high recording density and a recorded information reproducing apparatus for reproducing the information recorded on the particular recording disk. A linear velocity of the reading of information is adjusted according to a data quantity signal reproduced from the recording disk having data areas in which a compressed video signal produced by the compression and coding process is recorded in predetermined unit blocks (GOP block) and at least a data quantity information recording area in which a data quantity signal representing the quantity of each unit of the compressed video signal is recorded.

Abstract: A compressed picture information recording apparatus which sequentially stores modulated compressed video signals in a memory, and reads information from the memory in such a way as to reduce the information reading speed when the remaining memory space becomes smaller than a predetermined value and to increase the information reading speed when the remaining memory space becomes greater than the predetermined value. This apparatus records the read information on a recording disk at a recording linear velocity according to the information reading speed. This structure permits compressed video signals excluding invalid data to be continuously recorded on the recording disk at a variable transfer rate according to the producing rate of the compressed video signals, thus ensuring a high recording efficiency.

Abstract: A data block of digital data, which is to divided into a plurality of data blocks, is input to a transfer rate changing apparatus from a data transferring device at a first transfer rate each time when a transfer instruction signal is supplied to the data transferring device. The transfer rate changing apparatus is provided with: a memory device for storing the data block at the first transfer rate, which is transferred from the data transferring device, and outputting the stored data block at a second transfer rate, which is different from the first transfer rate; and a controlling device for supplying the transfer instruction signal, which instructs the data transferring device to transfer one data block to the memory device, to the data transferring device when the memory device finishes outputting another data block which has been transferred from the data transferring device prior to the one data block.

Abstract: A real-time image compression processor records on a CD or other recording media a compressed video signal which is compressively processed in a high recording efficiency at real-time as being reproduced by a VTR while preventing the image quality from being degraded. There are provided a first encoder for compressively encoding the video signal, and a second encoder for compressively encoding the signal obtainable by delaying such video signal for a given period of time. A parameter adjustment is executed for the second encoder in accordance with the compressed video signal obtained through the compressive encoding by the first encoder. The compressed video signal obtained by the second encoder is recorded on a recording medium.

Abstract: A disc playing apparatus which can access to a desired track at a high speed without losing an advantage of a large recording capacity of a non-CAV disc. A disc 1 on which a predetermined information signal is recorded is rotated at a constant rotational speed, the information signal is read out to thereby obtain a read signal, a reproduction clock signal CLK.sub.1 is extracted from the read signal, and the read signal is demodulated to thereby obtain demodulation data. A clock signal CLK.sub.2 of a predetermined frequency is generated, the demodulation data is stored in response to the reproduction clock signal CLK.sub.1, the stored demodulation data is sequentially read out in accordance with the storing order in response to the clock signal CLK.sub.2, and when it is detected that a residual data amount exceeds a predetermined amount, a read stop signal is generated, thereby stopping the reading operation of the information signal in response to the read stop signal.

Abstract: Apparatus and method for forming pits in an optical disk and the resulting disk. The preformed pits in the disk are adjusted to suppress the hump phenomenon by adjusting the amplitude and duty cycle of the standard modulating pulses. The amount of adjustment depends upon the duration of the standard pulses applied.

Abstract: An optical disk of the type including guide grooves is improved by regulating the width of the grooves, and thus the width of the adjacent land portion, in accordance with the type of information recorded at that part of the land.

Abstract: Herein disclosed is a device for accurately measuring an angular deviation of a flat plate such as a video disk and a digital audio disk. A light beam emitted from a light source is obliquely made incident on the flat plate. A light beam reflected by the flat plate is refracted by a convex lens and detected by a semiconductor position-sensitive detector. The convex lens and the position-sensitive detector are disposed in such a manner that the distance between a reflection point on the flat plate and the convex lens and the distance between the convex lens and the position-sensitive detector become two times the focal length and the focal length of the convex lens, respectively.

Abstract: In an optical disk manufacturing method in which a first photo resist layer, an intermediate resin layer, and a second photo resist layer are formed on a substrate in the stated order, a resin solution which is unsoluble in organic solvent is applied to the first photo resist layer, heated, and hardened to form the intermediate resin layer. Thereby the use of a large, expensive device such as a vacuum deposition device or sputting device is eliminated.