JP2005025923A5

JP2005025923A5 -

Info

Publication number: JP2005025923A5
Application number: JP2004167046A
Authority: JP
Filing date: 2004-06-04
Publication date: 2007-05-10
Anticipated expiration: 2024-06-04

Claims

For a plurality of information recording layer information recording medium are stacked, an optical information processing apparatus for writing and / or reading data,
A light source that emits light;
A condensing optical system for condensing light from the light source to form a focal point;
A light receiving unit that generates a light amount signal according to the amount of light received by at least one light receiving element;
A detecting optical system for guiding the light receiving portion of reflected light from the front Kijo information recording layer,
A layer discrimination signal is generated based on the light quantity signal, and the focal point is located in the vicinity of any information recording layer among the plurality of information recording layers of the loaded information recording medium based on the layer discrimination signal. and a processing circuit that determines,
Before Symbol receiving unit includes a discrimination light receiving element arranged on the basis of the incident area of the reflected light from the information recording layer other than the information recording layer in which the focal point is located near neighbor, as said at least one light receiving element, Optical information processing device.

The plurality of information recording layers include at least a first information recording layer and a second information recording layer,
The detection optical system guides the first reflected light from the first information recording layer and the second reflected light from the second information recording layer to the light receiving unit,
The processing circuit determines, based on the layer determination signal, whether the focus is located in the vicinity of the first information recording layer or the second information recording layer of the loaded information recording medium,
The light receiving unit includes the incident region of the second reflected light when the focal point is located in the vicinity of the first information recording layer, and the first when the focal point is located in the vicinity of the second information recording layer. The optical information processing apparatus according to claim 1, comprising: a light-receiving element for determination arranged based on an incident region of reflected light as the at least one light-receiving element.

An optical information processing apparatus that writes data to and / or reads data from a first information recording medium having a single information recording layer or a second information recording medium in which a plurality of information recording layers are stacked. And
A light source that emits light;
A condensing optical system for condensing light from the light source to form a focal point;
A light receiving unit that generates a light amount signal according to the amount of light received by at least one light receiving element;
A detection optical system for guiding reflected light from the information recording layer to the light receiving unit;
A processing circuit for generating a recording medium determination signal based on the light amount signal and determining a type of the information recording medium loaded based on the recording medium determination signal ;
Before Symbol receiving unit, the case where the second information recording medium is loaded, the information the focal point at which the focal point is located in the vicinity of one of the plurality of information recording layers is positioned near the recording An optical information processing apparatus including, as the at least one light receiving element, a light receiving element for determination arranged based on an incident region of reflected light from an information recording layer other than the information recording layer .

The plurality of information recording layers of the second information recording medium include at least a first information recording layer and a second information recording layer,
The detection optical system guides the first reflected light from the first information recording layer and the second reflected light from the second information recording layer to the light receiving unit,
The light receiving unit includes an incident area of the second reflected light when the focal point is located in the vicinity of the first information recording layer when the second information recording medium is loaded, and the focal point is the first focal point. 2. The optical information processing apparatus according to claim 3, wherein the at least one light receiving element includes a determination light receiving element arranged based on an incident region of the first reflected light when positioned in the vicinity of two information recording layers. 5. .

The optical information processing apparatus according to claim 2, wherein the optical detection optical system includes an optical element that gives astigmatism to the first reflected light and the second reflected light.

The light-receiving element for discrimination is disposed in a region where one of the first reflected light and the second reflected light is incident, out of the region of the light receiving unit where the first reflected light and the second reflected light are incident. The optical information processing apparatus according to claim 2 or 4 .

Due to the astigmatism, the first reflected light and the second reflected light have a first axis and a second axis perpendicular to and orthogonal to the optical axis, respectively, and the second reflected light has the focal point Before being incident on the light receiving unit with respect to the first axis when located in the vicinity of the first information recording layer,
The optical information processing apparatus according to claim 5 , wherein the light-receiving element for determination is disposed along an axis on the light-receiving unit corresponding to the first axis.

The optical information processing apparatus according to claim 7 , wherein a plurality of the determination light receiving elements are arranged at positions substantially symmetrical with respect to a center of the optical axis.

The light receiving unit receives a first reflected light when the focal point is located in the vicinity of the first information recording layer and a second reflected light when the focal point is located in the vicinity of the second information recording layer. A light receiving element for
The processing circuit according to claim 6 , wherein the processing circuit generates a focus error signal based on a light amount signal corresponding to an amount of light received by the processing light receiving element, and further determines a position of the focus based on the focus error signal. Optical information processing device.

The light receiving unit has at least one auxiliary light receiving element disposed along an axis on the light receiving unit corresponding to the second axis,
Regarding the second axis, the second reflected light converges on the back side of the light receiving unit when the focal point is located in the vicinity of the first information recording layer,
The optical information processing apparatus according to claim 7 , wherein the processing circuit further generates the layer determination signal based on an amount of light received by the auxiliary light receiving element.

The plurality of light-receiving elements for determination are arranged at positions substantially symmetrical with respect to the center of the optical axis, and the plurality of auxiliary light-receiving elements are arranged at positions substantially symmetrical with respect to the center of the optical axis. The optical information processing apparatus according to claim 10 .

The processing circuit calculates the difference between the light quantity signal from the light receiving element for discrimination and the light quantity signal from the auxiliary light receiving element by the sum of the light quantity signal from the light receiving element for discrimination and the light quantity signal from the auxiliary light receiving element. The optical information processing apparatus according to claim 10 , wherein division is performed to generate the layer discrimination signal.

When the focal point is located in the vicinity of the second information recording layer, the detection optical system converges the first reflected light in the vicinity of the optical element and converges the second reflected light on the light receiving unit. The optical information processing apparatus according to claim 2 or 4 .

When the focal point is located in the vicinity of the second information recording layer, the detection optical system converges the first reflected light before entering the optical element, and the second reflected light is reflected on the light receiving unit. The optical information processing apparatus according to claim 2 , which is converged.

The detection optical system includes a light blocking unit that blocks a part of the light,
When the focal point is located in the vicinity of the second information recording layer, the first reflected light is converged in the vicinity of the light shielding unit to block the incident on the light receiving unit, and the second reflected light is transmitted to the light receiving unit. The optical information processing apparatus according to claim 2 , wherein the optical information processing apparatus converges above.

The detection optical system includes a light shielding portion having an opening that shields a peripheral portion of light,
When the focal point is located in the vicinity of the first information recording layer, the peripheral portion of the second reflected light is blocked by the light shielding portion, and the cross-sectional area of the light beam of the second reflected light incident on the light receiving portion is made smaller. The optical information processing apparatus according to claim 2 or 4 .

Information specific to each information recording layer is recorded in the first information recording layer and the second information recording layer,
The processing circuit acquires the unique information, identifies an information recording layer where the focal point is located based on the unique information, and verifies whether the determination result is accurate by comparing with the determination result The optical information processing apparatus according to claim 2 or 4 .

Each of the first information recording layer and the second information recording layer has a plurality of information tracks in which the data is written, and each of the plurality of information tracks specifies a data position on the information recording medium. With a unique address,
The optical information processing apparatus according to claim 17 , wherein the processing circuit acquires the address information as the unique information.

As a result of verification, when it is determined that the focal point is located in the vicinity of an information recording layer different from the predetermined information recording layer, the processing circuit is in the vicinity of another information recording layer based on the layer determination signal. The optical information processing apparatus according to claim 17 , wherein the position of the focal point is changed.

The information recording medium has N + 1 (N: natural number) information recording layers, and the second information recording layer is an arbitrary layer up to the Nth layer as viewed from the light emitting side. 5. The optical information processing apparatus according to claim 2 , wherein the first information recording layer is an information recording layer located deeper than the second information recording layer.

An optical information processing apparatus for further writing and / or reading data on a third information medium in which a plurality of information recording layers different in number from the second information medium are laminated,
Information recording in which the focal point is located in the vicinity when the focal point is located in the vicinity of any one of the plurality of information recording layers of the third information medium when the third information recording medium is loaded The optical information processing apparatus according to claim 3, comprising: a light-receiving element for determination arranged based on an incident region of reflected light from an information recording layer other than the layer as the at least one light-receiving element.

The processing circuitry, based on the level of the layer discrimination signal when the focus exists in the vicinity of the information recording layer of the loaded information recording medium, to determine the number of the information recording layer, according to claim 3 Optical information processing equipment.

The light receiving unit reflects reflected light from the surface of the first information recording medium when the first information recording medium is loaded and the focal point is located in the vicinity of the single information recording layer. The optical information processing apparatus according to claim 3, comprising a light-receiving element for determination arranged based on an incident region as the at least one light-receiving element.

For a plurality of information recording layers laminated information recording medium, an optical head for writing and / or reading data,
A light source that emits light;
A condensing optical system for condensing light from the light source to form a focal point;
A light receiving unit that generates a light amount signal according to the amount of light received by at least one light receiving element;
A detecting optical system for guiding the light receiving portion of reflected light from the front Kijo information recording layer,
A layer discrimination signal is generated based on the light quantity signal, and the focal point is located in the vicinity of any information recording layer among the plurality of information recording layers of the loaded information recording medium based on the layer discrimination signal. and a processing circuit that determines,
Before Symbol receiving unit includes a discrimination light receiving element arranged on the basis of the incident area of the reflected light from the information recording layer other than the information recording layer in which the focal point is located near neighbor, as said at least one light receiving element, Optical head.

An optical head for writing and / or reading data on a first information recording medium having a single information recording layer or a second information recording medium in which a plurality of information recording layers are laminated,
A light source that emits light;
A condensing optical system for condensing light from the light source to form a focal point;
A light receiving unit that generates a light amount signal according to the amount of light received by at least one light receiving element;
A detection optical system for guiding reflected light from the information recording layer to the light receiving unit;
A processing circuit that generates a recording medium determination signal based on the light amount signal and determines the type of the information recording medium loaded based on the recording medium determination signal;
With
The light receiving section is an incident area of reflected light from the single information recording layer when the first information recording medium is loaded and the focal point is located in the vicinity of the single information recording layer. And information other than the information recording layer in which the focal point is located in the vicinity when the focal point is located in the vicinity of any one of the plurality of information recording layers when the second information recording medium is loaded An optical head comprising, as the at least one light-receiving element, a light-receiving element for discrimination arranged based on an incident area of reflected light from a recording layer.

A processing circuit in which a plurality of information recording layers to the stacking information recording medium, is mounted on a device for writing and / or reading data,
The device is
A light source that emits light;
A condensing optical system for condensing light from the light source to form a focal point;
A light receiving unit for generating a light intensity signal based on the light amount of at least one light receiving element, the focal point is positioned on the basis of the incident area of the reflected light from the information recording layer other than the information recording layer located near near A light receiving section including the discriminating light receiving element as the at least one light receiving element;
The reflected light from the front Kijo information recording layer and a detecting optical system for guiding the light receiving unit,
A layer discrimination signal is generated based on the light quantity signal, and the focal point is located in the vicinity of any information recording layer among the plurality of information recording layers of the loaded information recording medium based on the layer discrimination signal. A processing circuit that determines whether

A process implemented in a device for writing and / or reading data on a first information recording medium having a single information recording layer or a second information recording medium in which a plurality of information recording layers are stacked. A circuit,
The device is
A light source that emits light;
A condensing optical system for condensing light from the light source to form a focal point;
A light receiving unit that generates a light amount signal according to the amount of light received by at least one light receiving element, and the focal point is positioned in the vicinity of the single information recording layer when the first information recording medium is loaded. The incident area of the reflected light from the single information recording layer when the second information recording medium is loaded and the focal point is in the vicinity of any one of the plurality of information recording layers A light-receiving unit including, as the at least one light-receiving element, a light-receiving element for discrimination arranged based on an incident region of reflected light from an information recording layer other than the information recording layer in which the focal point is located nearby;
A detection optical system for guiding reflected light from the information recording layer to the light receiving unit;
With
A processing circuit that generates a recording medium discrimination signal based on the light amount signal and discriminates the type of the information recording medium loaded based on the recording medium discrimination signal.