Canon Kabushiki Kaisha

Shigeru Aoi

Yasuo Suzuki

Masaharu Tsukada

Takaaki Ashinuma

Makoto Shiho

Osamu Koyama

Taku Yamagami

Nobuhiro Kasama

Takayuki Aizawa

Takehiko Shibata

Kazuo Uzuki

Image processing apparatus and its processing method, storage medium, and image file format

An optical information processing method according to the present invention includes a first step of supplying a driving current to a light source so as to emit a light beam, a second step of converging the light beam emitted from the light source and irradiating the converged light beam onto an optical recording medium, a third step of adjusting a focal point of the light beam on the medium, a fourth step of adjusting the driving current so that the power of the light beam is set to a predetermined value in a state in which the focal point was adjusted a fifth step of storing the value of the driving current which was adjusted in the fourth step, and a sixth step of supplying the current of the value stored in the fifth step to the light source so as to emit the light beam and scanning the medium by the light beam, and thereby recording, reproducing, or erasing information. An apparatus to embody the above method is also disclosed.

Method and apparatus for driving light source by stored current value

An optical information recording/reproducing apparatus for stably recording, reproducing, or erasing the information by a laser beam with respect to different kinds of optical disks is represented. This apparatus includes a processor to record, reproduce, or erase the information for an optical disk, a disk sort detector to detect the sort of optical disk, and a controller to control the processing parameters of the processor in response to an output signal from the disk sort detector. The disk sort detector reads the disk sort identifying information preliminarily recorded on the optical disk by the processor to detect the sort of disk. Or, this detector irradiates light onto labels having different reflection factors or transmission factors preliminarily provided on the optical disks by the processor and detects the reflected light amounts or transmitted light amounts from the labels, thereby detecting the sort of disk. The optical disks include disks of the type only for use of reproduction, the rerecordable type, and the writable type.

Optical information recording/reproduction apparatus including means for

An optical information processing apparatus is so constructed that an optical head in the apparatus for recording and/or reproducing information by irradiating a light beam onto a recording medium is exchangeably attached to an apparatus main body, wherein a circuit which compensate for an offset of an electric signal which is output from the optical head, is attached to the apparatus main body so that it can be exchanged together with the optical head, thereby making unnecessary an offset adjustment after the optical head has been exchanged.

Optical information processing apparatus having offset adjusting circuit

An optical information processing method comprises a step of recording and/or reproducing information by irradiating a light beam to a periodically relatively moving record medium, detecting focusing and/or tracking servo signals and driving auto-focusing and/or auto-tracking means in accordance with the detected servo signals, a step of storing detected servo signals of at least one period of the movement of the medium, and a step of stopping the irradiation of the light beam to the medium and driving the auto-focusing and/or auto-tracking means in accordance with the stored ervo signals. An optical information processing apparatus for embodying the above method comprises a device for irradiating a light beam to an optical information record medium, a device for periodically moving the record medium relative to the light beam, a device for detecting focusing and/or tracking servo signals from the light beam reflected by or transmitted through the medium, auto-focusing and/or auto-tracking device, a feedback circuit for feeding the detected servo signal back to the auto-focusing and/or auto-tracking device, a device for storing the detected servo signals of at least one period of movement of the medium, and control device for deactivating the feedback circuit and activating the auto-focusing and/or auto-tracking device in accordance with the signals stored in the storage device when the irradiation of the light beam to the medium is stopped.

Optical information processing method of driving auto-focusing and/or

An image system can output image information to a plurality of output devices at a time, has a function to print, display, or store an image information before all of the image information is completely read out, and has a function to output an image information stored in a memory device by using an interface, before the completion of reading all of the image information. The image processing system includes for an example a readout device for reading image information; a storage device for storing the image information from the readout device; an output device for printing or displaying the image information from the readout device; an interface device for outputting a read-out information to the output device before the image information is completely read out; wherein the image information from the readout device is stored into the storage device by using the interface device.

Image processing system

An optical information processing apparatus including a light source, a lens system for condensing the light beam emitted from the light source as a minute spot on the track of a recording medium, tracking signal detectors for receiving the light beam from the spot modulated by the recording medium to thereby detect the positional deviation of the spot relative to the track in the tracking direction crossing the track, a correcting device for moving the lens system in the tracking direction in response to the output signal from the tracking signal detectors to thereby correct the positional deviation, and lens position detectors including at least one photoelectric converting element provided outside the effective diameter of the lens system so as to be movable with the lens system, and directly receiving part of the light beam emitted from the light source by the photoelectric converting element to thereby detect the position of the lens system in the tracking direction.

Optical tracking apparatus with photodetector disposed outside part of

An error signal detecting device is composed of means for irradiating an object with a concentrated light beam, a photosensor having a photoreceptor face divided into plural portions and adapted to receive the light reflected or transmitted by the object, a device for respectively dividing a first output and a second output obtained respectively from the first and second portions of the photoreceptor face of the photosensor, a first comparator for respectively comparing the outputs divided from the first output with the second output, a second comparator for respectively comparing the outputs divided from the second output with the first output, and a device for deriving a positional error signal indicating the positional error of the light beam spot with respect to the surface of the object, at least in one of the direction of optical axis and a direction perpendicular to the optical axis.

Error signal producing device having improved linearity

An optical information recording method comprises a first step of scanning a radiation beam on a disk-like recording medium without effecting tracking control, and recording information as concentric circular or spiral information tracks for at least one round on the recording medium, and a second step of scanning the radiation beam while effecting tracking control so as to keep a predetermined interval with respect to an information track recorded one round previously, thereby recording the information on the recording medium.

Method and apparatus for recording a continuous spiral information track

An optical information recording-reproducing apparatus in which a primary beam is applied to a recording medium and information is recorded and reproduced by the same primary beam while, at the same time, at least two secondary beams are applied to the recording medium and the lights of the secondary beams from the recording medium are detected to thereby obtain the position information of the primary beam on the recording medium has a device for varying the relative position of the primary beam and the secondary beams on the recording medium during recording of information and during reproduction of information.

Optical information recording-reproducing apparatus in which the

An image output apparatus comprises an image information supply unit, an output unit for causing any image information to be put out from the supply unit, a designating device for designating an image to be put out from the image information of the supply unit, a command device for commanding a change of the designated image, and a control device whereby, when a designated image change command is given before the outputting of a previously designated image is completed, the outputting of the previously designated image is stopped and the outputting of a newly designated image is started.

Image display apparatus capable of starting display of a new image in

An image display device has an image display window, an endless photosensitive belt, an image exposure unit, a semiconductor laser oscillator, developing equipment, an optical system, and a sequence controller. When a power-OFF switch is depressed, the current display image on the belt is erased first and then power is cut off. When the operator accidentally forgets to erase an image, the sequence controller automatically erases the image to allow protection of confidential data. However, a previous image can be redisplayed within a predetermined time after erasure of this image.

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Yokohama, Japan

Shigeru Aoi