KR100715732B1 - Apparatus for reproducing optical information and method of reproducing optical information using the same - Google Patents

Abstract

The present invention relates to an optical information reproducing apparatus and an optical information reproducing method using the same. The optical information reproducing apparatus according to the present invention provides a light source for irradiating light onto an optical information storage medium on which optical information is recorded, and reflects the light to desired light. And a light acquiring unit including a reflector for guiding information stored in the optical information storage medium and a lens for reflecting the information light reproduced from the light reflected by the reflector and incident on the optical information storage medium. Even when the distance between the lens and the storage medium is several mm or less, the incidence of light for reproducing information can be effectively achieved, so that the configuration of the optical information reproducing apparatus can be realized more efficiently, and at the same time, the servo control for optical information reproducing is easy together. It is effective to improve the optical information reproduction efficiency to be able to perform.

Description

Apparatus for reproducing optical information and method of reproducing optical information using the same}

1 is a block diagram showing an optical information reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view of part A of FIG. 1.

3 is a flowchart illustrating a method of reproducing optical information according to an embodiment of the present invention.

4 is a diagram illustrating a track servo control operation of the optical information reproducing apparatus according to the embodiment of the present invention.

5 is a diagram showing an optical information reproducing apparatus according to another embodiment of the present invention.

6 is a flowchart illustrating a method of reproducing optical information according to another embodiment of the present invention.

* Explanation of symbols for main parts of drawings *

100 ... light source

110 ... storage media

140 ... reflective mirror

150.Optical acquisition part

170.Control panel

The present invention relates to an optical information reproducing apparatus and an optical information reproducing method using the same, and more particularly, to an optical information reproducing apparatus for efficiently inputting reference light into the optical information storage medium when the optical information is reproduced and an optical information reproducing method using the same It is to provide.

There are various data recording apparatuses which are widely used in recent years. Typical data recording apparatuses include semiconductor memory, CD, HD-DVD, and Blu-ray. A more advanced data recorder is the holographic data recorder.

Digital versatile discs (DVDs) are still evolving, but they are expected to reach the limit of recording capacity at 50 gigabytes (giga byte). However, holographic data recording devices are expected to be capable of 1TB (terabyte), and the degree of integration is expected to be about 10 times higher than that of DVD.

The data recording method of the holographic data recording apparatus is different from the conventional general recording method. The holographic data recording device interferes with one point by using Fourier transform method for the entire information of the plane unlike the DVD method that records brightness information one by one for each specific coordinate to record data. Page-Oriented Memory (Interference fringe) is used. In addition, the holographic data recording technology records data in units of pages, and the input / output method also uses a parallel method and can support a speed 150 times faster than a current DVD in transmission speed.

On the other hand, the holographic data recording apparatus irradiates the reference light and the signal light to record data. Some of the holographic data recording devices that have been developed so far have been developed in the form of discs, such as CDs and DVDs. The holographic data recorder, developed and released by Japan's optware company, is in the form of a 12 cm diameter disc with the same diameter as a CD or DVD.

Such disk-type holographic data recording apparatus has been mainly developed by write once read many (WORM) method, but read / write memory (RW) has been mainly developed. Recently, a technology for a holographic data recording device using a read only memory (ROM) method using a faster copying technology has been disclosed. The ROM type holographic data recording apparatus is effective for mass duplication of discs.

Prior arts for such a holographic data recording apparatus include Korean Patent Laid-Open Publication No. 10-2005-0082030, and a data recording / reproducing apparatus and method for a holographic storage medium. The patent discloses a bit-type data incident on the entire disc by using a mask patterned with a data pattern for mass reproduction of the holographic data storage medium. The reference light multiplexes the reference light at various angles by replacing a conical mirror located at the bottom of the disk. The reproduction of the recorded data discloses that the reference light is incident on the recording portion with a phase conjugate wave and reproduced, and the pickup lens is used to detect the reproduced light.

In the prior art mentioned in the above-mentioned patent, it is disclosed that the phase-conjugated wave is incident obliquely between the storage medium and the pickup lens. However, the distance between the objective lens and the storage medium is approximately several mm or less although there is a slight difference depending on the numerical aperture of the objective lens. Therefore, it is difficult to enter the reference light at a predetermined predetermined angle between the lens and the storage medium.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an optical information reproducing apparatus and an optical information reproducing method using the same, which allows efficient light to be reproduced between an objective lens and an optical information storage medium. It is to.

The optical information reproducing apparatus according to the present invention for achieving the above object is a light source for irradiating light to the optical information storage medium on which optical information is recorded, the reflection to reflect the light to guide the optical information storage medium storing the desired optical information And a light acquiring unit including a lens which reflects the information light reproduced from the light reflected by the reflecting unit and incident on the optical information storage medium.

The optical information storage medium may be driven for reproducing optical information stored at another location, and the light source and the optical acquiring unit may be synchronized with each other to track the optical information.

The light source and the light acquisition unit may synchronize the servo operation in the same direction.

The light acquisition unit may be located at one side of the optical information storage medium, and the light source may be installed at a position opposite to the light acquisition unit with respect to the optical information storage medium.

The light acquiring unit and the light source may be adjacent to one side of the optical information storage medium, and a reflective surface may be formed on an opposite side of the surface on which the light of the optical information storage medium is incident.

The light source and the light acquisition unit may move in an optical information acquisition direction by an actuator.

A reflection mirror may be provided between the light source and the optical information storage medium to reflect light emitted from the light source toward the reflector.

The reflection mirror may drive for angular multiplexing of the light when multiplexing the optical information from the optical information storage medium.

The light may be a phase conjugated wave of light incident upon the storage of the optical information on the optical information storage medium, and the optical information may be read only memory (ROM) data in the form of a bit pattern.

The optical information reproducing method according to the present invention for achieving the above object comprises the steps of incident light to one side of the optical information storage medium storing the optical information; Reflecting light incident on the optical information storage medium to a position where optical information to be reproduced is stored in the optical information storage medium; And picking up and detecting the light reproduced from the optical information storage medium.

The light incident on the optical information storage medium may be transmitted to the optical information storage medium and then reflected to the position where the optical information is stored.

The light incident on the optical information storage medium may be reflected on the opposite side of the surface on which the light of the optical information storage medium is incident to be reflected back to the position where the optical information is stored.

The light may be a phase conjugated wave of light incident upon storage of the optical information on the optical information storage medium, and the optical information may be read only memory (ROM) data in the form of a bit pattern.

Hereinafter, an optical information reproducing apparatus and an optical information reproducing method according to an embodiment of the present invention configured as described above will be described. And the names of each component in the description of the following embodiments may be called other names in the art. However, if the functional similarity and identity thereof, even if the modified embodiment can be adopted may be equivalent configuration. In addition, the symbols added to each component is described for convenience of description. However, the contents shown in the drawings in which these symbols are described do not limit each component to the ranges in the drawings. Similarly, even if an embodiment in which the configuration on the drawings is partially modified is employed, it can be regarded as an equivalent configuration if there is functional similarity and identity.

1 is a block diagram showing an optical information reproducing apparatus according to an embodiment of the present invention. In the optical information reproducing apparatus according to the embodiment of the present invention, as shown in FIG. 1, a light source such as a laser oscillator for irradiating light onto the optical information storage medium 110 on which information is recorded below the optical information storage medium 110. 100 is provided. An optical acquiring unit 150 is provided on the optical information storage medium 110 to acquire optical information reproduced by the storage medium 110.

The optical information storage medium 110 is rotatably installed by the motor 120. The data area of the optical information storage medium 110 is a spiral track (t), and the optical information recorded in the track (t) may be read only memory (ROM) data in the form of a bit pattern. And this bit pattern may be a holographic interference fringe.

The light source 100 enters into the optical information storage medium 110 a phase conjugation wave of the reference light that was incident upon recording the optical information onto the optical information storage medium 110. In other words, the direction of incidence is made in the direction opposite to the direction at the time of recording, or the storage medium 110 is positioned and played in the direction opposite to the time of recording. Alternatively, the phase conjugate wave may be provided through a separate optical system in advance.

The light source 100 is coupled to the first actuator 130 for driving the light source 100 in the light irradiation direction. In the light irradiation direction of the light source 100, a reflection mirror 140 for guiding light toward the optical information storage medium 110 is provided. The reflection mirror 140 may use a galvano mirror to control the angle of incidence when the data is stored in the optical information storage medium 110 in multiple layers.

The light acquiring unit 150 includes a first lens 152 that captures the diffracted light by being positioned in a direction in which light incident on the optical information storage medium 110 is diffracted. The side of the first lens 152 is provided with a reflector 157 integrally coupled to the housing 151 of the light acquisition unit 150. When the light emitted from the light source 100 passes through the optical information storage medium 110, the reflector 157 reflects the transmitted light back to a position for reproducing the optical information.

The second lens 153 for guiding the regenerated light is provided on the upper side of the first lens 152, and the screen (three holes 156a, 156b, 156c) are formed on the upper side of the second lens 153. 156) (see FIG. 2). In addition, a third lens 154 and a fourth lens 155 are respectively provided on the upper portion of the screen 156, and a photo detector 158 is provided on the upper portion of the fourth lens 155. The photo detector 158 may be a photo detector integrated circuit (PDIC). Elements constituting these light acquisition units 150 are mounted in one housing 151. The housing 151 is coupled to the second actuator 160 to be movable in the optical information detection direction.

Meanwhile, the first actuator 130 and the second actuator 160 are synchronized with each other in the tracking operation for reproducing optical information stored at different positions of the optical information storage medium 110 to perform servo operation. At this time, the servo operation is controlled by the controller 170 such that the light source 100 and the light acquisition unit 150 move at the same moving distance in the same direction. The reflection mirror 140 adjusts the reflection angle by the controller 170 at the time of multiple reproduction of the optical information.

Hereinafter, the optical information reproducing method according to the embodiment of the present invention configured as described above will be described. 3 is a flowchart illustrating a method of reproducing optical information according to a first embodiment of the present invention.

As shown in FIG. 3, light is incident to the lower side of the optical information storage medium 110 in which the optical information is stored (S100). In this case, the reflection mirror 140 reflects the incident light at a predetermined angle and guides the light to the optical information storage medium 110. The optical information storage medium 110 is a transparent material. Therefore, light incident on the optical information storage medium 110 passes through the optical information storage medium 110.

The transmission direction of the light transmitted through the optical information storage medium 110 is at the reflection part 157 side of the light acquisition part 150. Therefore, the light transmitted through the optical information storage medium 110 is reflected by the reflector 157 again toward the optical information storage medium 110 at a predetermined angle, where the position reflected by the optical information storage medium 110 is incident The desired optical information is stored at step S110. As such, when the light is reflected and guided to the location where the optical information of the optical information storage medium 110 is stored, the incident of light is effectively performed even when the distance between the optical information storage medium 110 and the light acquisition unit 150 is several mm. Can be.

Meanwhile, the light incident on the optical information storage medium 110 then passes through the optical information storage medium 110, where the optical information is diffracted and reproduced. At this time, the reproduced optical information is picked up by the optical acquisition unit 150 and detected. The reproduced light information first passes through the screen 156 through the first lens 152 and the second lens 153. Light on the screen 156 is finally detected by the photo detector 158 through the third lens 154 and the fourth lens 155 through the three holes 156a, 156b, and 156c.

The track t servo control is performed on the optical information detected by the photodetector 158 based on the results detected by the three holes 156a, 156b, and 156c. FIG. 2 is an enlarged plan view of part A of FIG. 1. As shown in FIG. 2, the first hole 156a in the center is actually for detecting optical information, and the second and third holes 156b and 156c located on both sides of the top and bottom are left and right of the track t. It is to detect both sides. Therefore, when the intensity of the light diffracted through the second hole 156b and the third hole 156c on both sides is equally controlled, the optical information is accurately detected in the central first hole 156a. At this time, the servo control is performed by the first actuator 130 and the second actuator 160.

In addition, the acquisition of the optical information in the other track (t) can be performed by controlling the first actuator 130 and the second actuator 160. 4 is a diagram illustrating a track servo control operation of the optical information reproducing apparatus according to the embodiment of the present invention. As shown in FIG. 4, the first light B1 is incident for acquiring optical information for the first track t1. Next, when the first actuator 130 and the second actuator 160 are moved with respect to the second track t2, the light provided from the light source 100 is reflected while the angle reflected by the reflection mirror 140 is maintained. The position is different, and light can be incident on each track t in the same way for the third and other tracks t3.

The superimposed recorded optical information and the multi-layer recorded optical information are possible by controlling the incident angle of the reflection mirror 140, and the reproduction of these tracks t at this time is performed by the first actuator 130 and the second actuator ( By controlling the 160, the optical information is reproduced.

Hereinafter, an optical information reproducing apparatus and a reproducing method according to another embodiment of the present invention will be described. In the following description of the embodiments, descriptions of the same elements as the above-described embodiments will be described as briefly as possible, and reference numerals for each of the elements will be described with different reference numerals. 5 is a diagram illustrating an optical information reproducing apparatus according to another embodiment of the present invention, and FIG. 6 is a flowchart illustrating an optical information reproducing method according to another embodiment of the present invention.

First, as shown in FIG. 5, the optical information reproducing apparatus according to another embodiment of the present invention includes a light source 200 for irradiating light onto the optical information storage medium 210 on which information is recorded on the optical information storage medium 210. And an optical acquiring unit 250 for acquiring the reproduced optical information on the side of the light source 200 among the upper portion of the optical information storage medium 210.

The optical information storage medium 210 is rotatably installed by the motor 220 and has a spiral track t. The optical information recorded in the track t is a ROM (Rread) in the form of a bit pattern. only memory) data. And this bit pattern may be a holographic interference fringe. In addition, the lower surface of the optical information storage medium 210 forms a reflective surface 211 through which incident light is reflected.

And a lens for capturing and guiding the light emitted from the light source 200. The light source 200 enters the phase conjugate wave of the incident reference light into the optical information storage medium 210 when the optical information is recorded on the optical information storage medium 210. In addition, the light source 200 is coupled to the first actuator 230 for driving the light source 200 in the light irradiation direction, and the reflection for guiding light toward the optical information storage medium 210 in the light irradiation direction of the light source 200. The mirror 240 is installed. The reflection mirror 240 may use a galvano mirror to control the angle of incidence when data is recorded in a multi-layered or multiplexed optical information storage medium 210.

The light acquisition unit 250 has the same configuration as that of the first embodiment described above. Briefly, the first lens 252 and the reflector 257 integrally coupled to the housing 251 are provided. The second lens 253 is provided on the image side of the first lens 252, and the screen 256 having three holes is formed on the image side of the second lens 253. In addition, a third lens 254 and a fourth lens 255 are respectively provided on the upper portion of the screen 256, and a photo detector 258 is provided on the upper portion of the fourth lens 255. Configurations of the light acquisition unit 250 is mounted to one housing 251. The housing 251 is coupled to the second actuator 260 to be movable in the optical information detection direction.

In addition, the first actuator 230 and the second actuator 260 are synchronized with each other during a tracking operation for reproducing optical information stored in another position of the optical information storage medium 210, and the servo operation is performed by the controller 270. Is performed by

In the optical information acquisition method according to the second embodiment of the present invention configured as described above, light is incident on the optical information storage medium 210 in which the optical information is stored (S200). In this case, the reflection mirror 240 reflects the incident light at a predetermined angle and guides the light to the optical information storage medium 210. Light is reflected from the lower reflection surface 211 of the optical information storage medium 210. The reflected light travels to the reflection part 257 side of the light acquisition part 250. The light is again reflected by the reflector 257 and directed toward the optical information storage medium 210 at a predetermined angle (S210).

At this time, the position incident on the optical information storage medium 210 becomes the position where the desired optical information is stored, and then the light diffracted by the optical acquiring unit 250 is captured and acquired (S220). In this way, when the light is reflected to enter the incident position where the optical information of the optical information storage medium 210 is stored, even if the distance between the optical information storage medium 210 and the light acquiring unit 250 is several mm, the light is effectively incident. Can be performed. And the track servo control for the other track t can proceed in the same way as in the first embodiment already mentioned.

In the optical information reproducing apparatus and the optical information reproducing method according to the embodiments of the present invention, even if the distance between the optical information storage medium and the optical acquiring unit is dense, the light can be effectively incident. Meanwhile, in the second embodiment, the light source and the light acquisition unit may be installed together in the same housing to be driven by one actuator.

In the optical information reproducing apparatus and the optical information reproducing method according to the embodiment of the present invention as described above, components having other additional functions are added. Alternatively, the present invention may be replaced with another component, but another modified embodiment includes essential components of the present invention, and separately records or reproduces optical information by using an optical multiplexer according to an embodiment of the present invention. Or recording and reproducing together, all should be regarded as included in the technical scope of the present invention.

As described above, the optical information reproducing apparatus and the optical information reproducing method according to the present invention enable effective incidence of light for reproducing information even when the distance between the lens and the storage medium of the optical acquisition unit is several mm or less. It is possible to more efficiently implement the configuration, and at the same time it is possible to easily perform the servo control for the reproduction of optical information has the effect of improving the optical information reproduction efficiency.

Claims (15)

A light source for irradiating light to the optical information storage medium storing the optical information; A reflection unit for reflecting the light transmitted through the optical information storage medium to a location where optical information desired for reproduction of the optical information storage medium is stored; and a light reflected from the reflection unit and reproduced from the light incident on the optical information storage medium. And a light acquiring unit comprising a lens for capturing information light and a photo detector for detecting the information light captured by the lens. The optical information storage medium of claim 1, wherein the optical information storage medium is driven to reproduce optical information stored at another location, and the light source and the optical acquisition unit are synchronized with each other to track the optical information. Optical information reproducing apparatus. The optical information reproducing apparatus according to claim 1, wherein the optical acquisition unit is located at one side of the optical information storage medium, and the light source is installed at a position opposite to the optical acquisition unit with respect to the optical information storage medium. The optical information reproducing apparatus according to claim 3, wherein the light source and the light acquiring unit move in an optical information acquiring direction by an actuator. According to claim 1, Between the light source and the optical information storage medium is provided with a reflection mirror for reflecting the light irradiated from the light source toward the optical information storage medium, the reflection mirror is to receive the optical information from the optical information storage medium And optical driving for angular multiplexing of the light during multiple reproduction. The optical information of claim 1, wherein the light is a phase-conjugated wave of light incident upon storage of the optical information on the optical information storage medium, and the optical information is read only memory (ROM) data in the form of a bit pattern. Playback device. Injecting light into one side of an optical information storage medium storing optical information; Reflecting the light passing through the optical information storage medium to a location where optical information desired for reproduction of the optical information storage medium is stored; And picking up and detecting the light reproduced from the optical information storage medium. The optical information of claim 7, wherein the light is a phase conjugated wave of light incident upon storage of the optical information on the optical information storage medium, and the optical information is read only memory (ROM) data in the form of a bit pattern. How to play. A light source for recording light information and irradiating light to the other surface of the optical information storage medium having a reflective surface formed on one surface thereof; A reflector for reflecting the light reflected from the reflective surface back to an optical information storage medium storing desired optical information; a lens for capturing information light reflected from the light reflected by the reflector and incident on the optical information storage medium; And a light acquisition unit including a light detector for detecting the information light captured by the lens. 10. The optical information storage medium of claim 9, wherein the optical information storage medium is driven to reproduce optical information stored at another location, and the light source and the optical acquiring unit are synchronized with each other to track the optical information. Optical information reproducing apparatus. The optical information reproducing apparatus according to claim 9, wherein the light acquisition unit and the light source are located adjacent to one side of the optical information storage medium. 10. The method of claim 9, wherein between the light source and the optical information storage medium is provided with a reflection mirror for reflecting the light irradiated from the light source toward the reflector side, the reflection mirror is a multi-reproducing optical information from the optical information storage medium And driving for angular multiplexing of the light. 10. The optical information of claim 9, wherein the light is a phase conjugated wave of light incident upon storage of the optical information on the optical information storage medium, and the optical information is read only memory (ROM) data in the form of a bit pattern. Playback device. Injecting light into the other surface of the optical information storage medium having optical information stored thereon and having a reflective surface formed on one surface thereof; Reflecting the light incident on the optical information storage medium and reflected from the reflective surface back to a position where the optical information to be reproduced on the optical information storage medium is stored; And picking up and detecting the light reproduced from the optical information storage medium. 15. The optical information of claim 14, wherein the light is a phase conjugated wave of light incident upon storage of the optical information on the optical information storage medium, and the optical information is read only memory (ROM) data in the form of a bit pattern. How to play.

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