JP2006040367A - Optical disk apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk apparatus wherein printing can be made possible by controlling a focal position of light with which a label surface is irradiated even when a specular reflectance of a printing layer is low. <P>SOLUTION: In the optical disk apparatus performing recording of information to a label on an optical disk 10 by an optical pickup, the label is provided with the printing layer 11 and a transparent protective layer 12 and the printing layer 11 is irradiated with recording light to perform printing by controlling the focal position of the recording light emitted from a laser light source 21 of the optical pickup on the surface of the protective layer 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical disc apparatus that prints characters, image information, and the like on a label surface of an optical disc.

  Recordable optical discs and optical disc devices have become widespread, and in order to recognize and manage the content recorded on the optical disc, information relating to the recorded content is written on the label surface of the optical disc by handwriting or printing means such as a printer. Yes. A technique for printing information on a heat-sensitive recording paper on the label surface inside an optical disk device is described in, for example, (Patent Document 1).

Thereby, high quality printing can be realized without using external printing means other than the optical disk device. In addition, the printing layer of the thermal recording paper includes a dye, a color developing material that develops a dye in response to heat, a photothermal conversion dye that efficiently absorbs the wavelength of the recording light emitted from the optical pickup, and changes heat. Therefore, increasing the sensitivity of the printing layer is also being studied. The technique regarding these is described in, for example, (Patent Publication 1).
JP 2000-30408 A

  A printing layer made of heat-sensitive recording paper is formed by pulverizing dyes, color developing materials, pigments and the like into fine particles and applying them to paper materials, but the surface scatters light. In an optical disk device, in order to focus on the information surface on the optical disk, reflected light from the optical disk is received by an optical sensor, and the condenser lens is controlled based on the focus servo signal. The printing layer has problems such as difficulty in controlling the focal position on the surface due to light scattering.

  The present invention has been made in order to solve the above-described problems, and can perform printing by controlling the focal position of light irradiated on a label surface even when the specular reflectance of the printing layer is small. The purpose is to provide.

  In order to solve the above-described problems, an optical disk apparatus according to the present invention is an optical disk apparatus that records information on an optical pickup with respect to a label provided on the optical disk, and the label includes a printing layer and a transparent protective layer. A part of the recording light from the optical pickup is reflected by the surface of the protective layer and returned to the optical pickup to focus control the optical pickup, and the recording light transmitted through the protective layer is printed An optical disc apparatus that prints by irradiating a layer.

  In the present invention, by forming a transparent protective layer having a predetermined thickness on the print layer, the optical pickup can be focused using the light specularly reflected on the surface of the protective layer. Even if the rate is small, it is possible to realize an optical disc apparatus capable of printing by controlling the focal position of light irradiated on the label surface.

The invention of the present application is an optical disc apparatus that records information on a label provided on an optical disc by an optical pickup, wherein the label includes a printing layer and a transparent protective layer, and the recording light from the optical pickup is recorded. A part of the light is reflected from the surface of the protective layer and returned to the optical pickup to control the focus of the optical pickup, and the recording layer that has passed through the protective layer is irradiated to the printing layer for printing. This is an optical disc device.

  By forming a transparent protective layer with a predetermined thickness on the print layer, the optical pickup can be focus-controlled using the light that is specularly reflected on the surface of the protective layer, so the specular reflectivity of the print layer is small. In addition, it is possible to realize an optical disc apparatus capable of printing by controlling the focal position of light irradiated on the label surface.

  In the invention of the present application, the print layer of the label can be a thermal paper printed by heat which has absorbed at least a part of the recording light and thermally converted, and the protective layer is a transparent resin coating layer. Can do.

  Hereinafter, the present invention will be described based on the embodiments.

  FIG. 1 is a configuration diagram of an optical disc apparatus according to an embodiment of the present invention. In FIG. 1, an optical disk 10 includes a printing layer 11 containing a leuco heat sensitive material on a label surface, and a protective layer 12 made of a transparent resin having a thickness of 30 μm and a refractive index n = 1.5, coated on the printing layer 11. It has a label for printing.

The light emitted from the laser light source 21 passes through the beam splitter 22 and the collimator lens 23, is reflected by the reflection mirror 24, is collected by the objective lens 25, and is collected on the surface of the protective layer 12. The numerical aperture of the objective lens 25 is 0.6, and the objective lens 25 is held by a focus servo mechanism (not shown) that displaces the position relative to the optical disc. The light emitted from the objective lens 25 enters the protective layer 12 from the air of n ₀ = 1.0, and about 4% of the incident light is specularly reflected by Fresnel reflection due to the difference in refractive index on the surface of the protective layer 12. To do. The specularly reflected light returns through the same objective lens 25 and collimator lens 23, is separated by the beam splitter 22, is guided to the cylindrical lens 26 for obtaining focus servo, and is received on the optical sensor 27.

  Due to the action of the cylindrical lens 26, a light amount distribution corresponding to the positional relationship between the focal position of the light and the surface of the protective layer 12 is generated on the optical sensor 27, and the objective lens 25 of the optical pickup is moved based on the signal generated from this light amount distribution. Focus control is performed on the surface of the protective layer 12. About 96% of the light transmitted through the protective layer 12 becomes a light spot having a diameter of about 26 μm on the print layer 11 depending on the thickness and refractive index of the protective layer 12 and the numerical aperture of the objective lens 25. 11 is partially absorbed and becomes heat, and the print layer 12 is discolored to perform printing.

  The diameter of the light spot irradiated on the print layer 11 according to the thickness of the transparent protective layer 12 on the print layer 11, the refractive index of the protective layer 12, and the numerical aperture of the objective lens 25 of the optical pickup, that is, light. Since the energy density of the beam can be changed, the thickness and refractive index of the protective layer 12 can be appropriately set according to the numerical aperture of the objective lens 25 and the print sensitivity characteristics of the print layer 11.

  The optical disc apparatus of the present invention can perform focus control so that light is specularly reflected on the surface of the protective layer and the reflected light is used to focus the surface of the protective layer. The present invention can be applied to an optical disc apparatus that prints information on a heat sensitive material.

Configuration diagram of an optical disc apparatus according to an embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical disk 11 Print layer 12 Protective layer 21 Laser light source 22 Beam splitter 23 Collimator lens 24 Reflection mirror 25 Objective lens 26 Cylindrical lens 27 Optical sensor

Claims (2)

An optical disc apparatus for recording information on an optical disc by an optical pickup, wherein the label includes a printing layer and a transparent protective layer, and a part of the recording light from the optical pickup is protected. An optical disc apparatus characterized by controlling the focus of the optical pickup using return light reflected from the surface of the layer and returning to the optical pickup, and irradiating the recording layer with the recording light transmitted through the protective layer . The print layer of the label is a thermal paper printed by heat which has absorbed at least a part of the recording light and thermally converted, and the protective layer is a transparent resin coating layer. Optical disk device.

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