Olympus Optical Company, Ltd.

Yoshiro Yoda

Shoji Yoshikawa

Masanori Doi

Saburo Funada

Kazutake Sugawara

An electronic camera system of this invention includes an electronic camera for converting an image obtained by sensing into a file and recording the file, a PHS unit attached to the electronic camera to transmit the image file recorded in the electronic camera upon obtaining base station identification information of a master unit in position registration processing according to movement, the master unit having registered the PHS unit as a subsidiary unit, a private base station as the master unit, in which the PHS unit is registered as the subsidiary unit in advance, for transferring the image file sent in position registration processing of the PHS unit, and an electronic album apparatus connected to the private base station to record the image file transferred from the private base station.

Electronic camera system capable of remote data storing

A photomagnetic recording apparatus comprises an optical pickup movable with reference to a photomagnetic recording medium to irradiate an optical beam toward a predetermined region of the photomagnetic recording medium, and a magnetic field-generating mechanism for applying a uniform magnetic field to that predetermined region of the optical magnetic recording medium which is irradiated with the optical beam. The magnetic field-generating mechanism includes a yoke, at least one arm portion supported by the yoke, a coil winding held by the at least one arm portion, and a recording medium-facing member supported by the at least one arm and having end portions extending from the coil winding in the direction in which the optical pickup is movable. The yoke, at least one arm portion, and the recording medium-facing member are made from a magnetic material.

Photomagnetic recording and erasing apparatus having magnetic field

The bias magnetic field abnormality detecting apparatus is used in a photomagnetic recording and reproducing apparatus for recording information on a recording medium or for reproducing and erasing the information from the recording medium and is provided with a field magnetic coil generating a magnetic field in the reverse direction at the time of recording and erasing information but generating no magnetic field at the time of reproducing information. A magnetic field detecting circuit detects the polarity of at least the magnetic field of the field magnetic coil and detects whether the magnetic field is abnormal or not. A writing in protecting circuit prohibits the recording and erasing operations by the output of the magnetic field detecting circuit.

Bias magnetic field abnormality detecting apparatus which controls

In an optomagnetic recording/reproducing apparatus, an objective lens is actuated by a lens actuator having focusing and tracking magnetic circuits so that a light beam is focused on an optical disk and is directed to a predetermined area of the optical disk. The lens actuator is mounted on a pickup body which is driven in a radial direction of the disk by a driving magnetic circuit. The optical disk is clamped on a turntable by a magnetic clamp mechanism. First leakage magnetic fields produced from each of the focusing and tracking magnetic circuits, second leakage magnetic fields are produced from the driving magnetic circuit and the magnetic clamp mechanism, and the first and second magnetic fields are directed in mutually opposite directions relative to the optical disk.

Arrangement for minimizing effects of leakage magnetic fields in

A reproduction apparatus for an optical magnetic disk having data recorded in a magneto-optical recording form and an address recorded in an optical recording form, includes a pickup for detecting P- and S-axis components of a linearly polarized laser beam reflected on an optical magnetic disk, an adder for adding the P- and S-axis components, and a subtracter for subtracting the S-axis component from the P-axis component. A reproduction signal processing circuit confines an output of the adder and that of the subtracter to produce a reproduction signal. A comparator converts the reproduction signal into a binary signal, the reproduction signal processing circuit including a circuit for identifying whether a reproduction signal is one of magneto-optical recording information or one of optical recording information. A variable gain amplifier amplifies the subtraction signal of the P- and S-axis components, at an amplification factor corresponding to a result of identification, in which the reproduction signal of optical recording information has a greater amplification factor than the amplification factor of the reproduction signal for magneto-optical recording information.

Reproduction apparatus for a magneto-optical recording medium

In an apparatus for generating a magnetic field, first and second electromagnetic coils are linearly arranged on a yoke. The coils face one surface of an optical disk. An optical head is positioned above the other surface of the optical disk. A track address for denoting a track on the optical disk is picked up from the optical disk by the optical head and an information signal processor. A first and/or second energizing signal is generated from a switching circuit in accordance with the track address. Thus, one or both of coil drive circuits are driven in response to the energizing signals, energizing one or both of the coils, so that a predetermined magnetic field is applied to the optical disk from the selected coil or coils.

Apparatus for generating magnetic field in a magneto-optic

The optical recording and reproducing apparatus comprises a magnetic field applying section, a movable mechanism for moving the magnetic field applying section, a distance detecting section for detecting a distance between magnetic poles of the magnetic field applying section and the surface of a recording medium, and a distance control section for maintaining the above distance constant in response to an output of the distance detecting section. The distance between two magnetic pole ends of the magnetic field applying section can be minimized. Further, on the basis of the tracking control of either one of the recording and erasing light beams, it is possible to enable a high-precision tracking control to the other of the two light beams.

Optical recording and reproducing apparatus

In a system in which a signal is read out of a medium for recording binary-coded information data, an information signal having no dc component is detected, and the information signal is compared with a slice signal to detect a series of binary-coded signals. The system includes a slice signal generating circuit for detecting an envelope of the information signal and generating a slice signal on the basis of the detected envelope signal such that the voltage level of the slice signal corresponds to a dc voltage level of the information signal when the information signal is being read and the voltage level thereof is higher than the noise level when the information signal is not being read.

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Tama, Japan

Yoshiro Yoda