Sony Corporation

Kenzo Nakagawa

Katsuhisa Aratani

Akira Kouchiyama

Shinichi Kai

Yoshihiro Takemoto

Masayuki A Suzuki

Susumu Hoshimi

Yoshiaki Takano

The method of the present invention includes: an exposing process in which an inorganic resist layerformed on a substrateis irradiated with recording laser light modulated by an information signal corresponding to an information signal of an information concave and convex pattern formed on an optical disc to form an exposed pattern corresponding to the information concave and convex pattern on the optical disc, and after the above process a development process in which development processing is performed on the inorganic resist layer to form a concave and convex pattern corresponding to the information concave and convex pattern of the inorganic resist layer; in the above exposing process, after a trial exposure is performed on a non-recording area of the above resist layer, the exposed portion is irradiated with evaluation laser light and a recording signal characteristic of the above resist layer is evaluated from the reflected light to determine based on the evaluation result an optimum focus position of recording laser light which is later performed; and accordingly the recording signal characteristic (jitter value) of the optical disc is predicted and evaluated in the exposing process from the recording characteristic of the exposed portion on the resist to appropriately adjust an exposure focusing position based on the evaluation result and thus, a master having an appropriate concave and convex pattern and consequently an optical disc having an excellent characteristic can be manufactured.

Method of making master for manufacturing optical disc and method of manufacturing optical disc

The method of the present invention includes an exposing step in which a laser beam for recording modulated by an information signal corresponding to an information signal of an information concave and convex pattern formed on the optical disc is applied to an inorganic resist layerformed on a substrateto form an exposed pattern corresponding to the information concave and convex pattern on the optical disc, and a development step in which a concave and convex pattern corresponding to the information concave and convex pattern by the inorganic resist layer is formed. By applying a laser beam for estimation to a predetermined area on the inorganic resist layer in the exposing step to estimate recorded signal characteristics of the exposed pattern by the inorganic resist layer using reflected light of the laser beam for estimation, and controlling power of the laser beam for recording based on the estimated result, the aimed information recording on the optical disc can reliably be obtained.

A disk recording apparatus in which a marked improvement is achieved in terms of vibration dampening and shock impact resistance on the disk device. In this disk recording apparatus, a built-in disk device is elastically supported by a plurality of insulators, and the feeding direction of a carriage feeding mechanism for an optical disk and an optical pick-up of the disk device is substantially parallel to the optical axis of a photographic lens.

Elastic support assembly for disk device for disk recording apparatus with video camera

A recording medium includes a user data area (UDA) for writing real data and a program memory area (PMA) for writing management data. In the PMA, a repetitive writing operation number NA of the UDA, write end address AE, operation life number NL and final address AL, etc. are written. On the occasion of recording real data to the UDA, writing is started from the address next to the write end address AE at the time of the preceding recording operation and after the recording is executed up to the final address AL, data writing is started again from the start address to give an increment of one (1) to NA. The real data is written in average up to the final address from the start address of UDA. When NA exceeds NL, a warning is displayed and the recording medium (e.g. a disc) ejected. Therefore, the recording medium's operational life is extended and the safety of data written to the UDA is assured.

Recording medium driver

A disc cartridge having a cartridge body in which a magneto-optical disc is rotatably accommodated in a hermetic-fashion so as to be capable of recording and/or reproduction. The cartridge body has a concave recessed portion extended from an insertion side end face of the cartridge body to a central portion of the cartridge body to allow the introduction of an external magnetic field generating means which generates an external magnetic field to record an information signal on the magneto-optical disc accommodated within the cartridge body.

Disc cartridge

A device is provided for opening and closing a shutter member of a disk cartridge containing a disk in a cartridge housing and adapted for insertion into a signal recording and/or reproducing apparatus that uses the disk as a magnetic recording medium. The cartridge housing has signal read and write apertures in its upper and lower walls. The shutter member is mounted so as to partially cover a front wall and the upper wall and lower wall of the cartridge housing for opening and closing the apertures, and has an engaging opening exposing the front and lower walls. The device includes a pair of opening and closing elements mounted on the signal recording and/or reproducing apparatus so as to be in the path of insertion of the disk cartridge. The elements are provided with engaging portions adapted for selectively engaging in the engaging opening of the shutter member and for being rotated when thrust by the disk cartridge. The opening and closing elements are so designed that their engaging portions strike each other to inhibit insertion of the disk cartridge when the latter is inserted with a reversed orientation so that its rear side opposes the opening and closing elements.

Device for opening and closing a shutter member of a disk cartridge

In a brushless DC motor, the rotor has a rotor shaft with a rotor yoke attached thereto and an annular rotor magnet mounted on the rotor yoke, the stator has a stator yoke with stator coils disposed on the stator yoke so as to face the rotor magnet, and two magnetic field sensing elements, such as, Hall elements, are provided for detecting the rotational position of the rotor. A printed wiring board and the stator coils are arranged on the same surface of the stator yoke so as to make the motor flat. The printed wiring board also serves as a thrust pad for the rotor shaft and provides a ground for the latter.

Growing community of inventors

Kanagawa, Japan

Kenzo Nakagawa