The present invention relates to an optical pickup apparatus that is capable of at least reading information from an optical disc, an optical information apparatus having the optical pickup apparatus and an optical information recording/reproducing apparatus having the optical information apparatus.
There are various kinds of recording media used for recording and storing digital audio data, image data, animation data, as well as document files and data files formed by computers and the like, and optical discs are one kind of these. Among optical discs, the DVD (Digital Versatile Disk) can record a large quantity of information with a higher density in comparison with conventional CDs (Compact Discs), and has come to be widely used in the field of recording apparatuses also, as a medium that is substituted for the VTR (Video Tape Recorder) which is mainly used at present. Moreover, in recent years, examinations on optical discs of the next generation in which the recording density is further increased by using a violet semiconductor laser have been conducted in various places, and the early market introduction is expected. In order to record and reproduce data on and from these optical discs, appropriate optical pickup apparatuses are required.
Here, the straight line connecting a light-emitting point position of the light source 1 with an optical center point of the collimate lens 4 is referred to as a light axis 21, and various parts are arranged so that the light axis 21 passes through an optical center point of the condensing lens 6. For this reason, upon assembling the optical pickup apparatus 30, it is essential to adjust the light axis by adjusting the light-emitting point position, that is, the position of the light source 1, and also to provide a structure that makes the light source 1 less vulnerable to positional deviations after the adjustments.
With respect to the method of securing the light source 1 after the light-axis adjustments, generally, as disclosed in Japanese Patent Application Laid-Open No. 2003-132570 and as shown in
Patent Document 1: Japanese Patent Application Laid-Open No. 2003-132570
Patent Document 2: Japanese Patent Application Laid-Open No.
Patent Document 3: Japanese Utility Model Registration No. 3098794
In the method of the prior art, shown in
Moreover, in the method of the prior art, shown in
Moreover, in recent years, there have been developments in a higher output in a red laser light source in order to achieve higher speeds in writing and reading information on and from an optical disc, as well as developments in a shorter wavelength in a laser light in order to achieve reading and writing operations with a large amount of information, that is, the use of a blue laser light. This trend has made the quantity of heat generation in the laser light source greater in comparison with that of the conventional apparatus. Since the heat generation exceeding a permissible level gives adverse effects to the stability of light emission and light irradiation, it becomes very important to release heat from the laser light source in the optical pickup apparatus.
The present invention has been devised to solve the above-mentioned problems, and its objective is to provide an optical pickup apparatus in which a small size and a reduction in the number of parts have been achieved, and which is superior in durability against an external influence such as a drop impact, and has an excellent heat radiating property in the light source, and also to provide an optical information apparatus having the optical pickup apparatus and an optical information recording/reproducing apparatus having the optical information apparatus.
In order to achieve the above-mentioned objective, the present invention has the following arrangements.
An optical pickup apparatus in accordance with a first aspect of the present invention, which is provided with:
a base; and
a light source that is attached to the base and emits light to be applied to an optical information medium,
with the second side face of the light source being made in contact with the mount face of the holding section so that the light source is held on the holding section, the bonding agent being injected into the gap to be made in contact with the first side face and the wall face and secures the light source to the holding section.
Moreover, an optical pickup apparatus in accordance with a second aspect of the present invention, which is provided with:
a base; and
a light source holder that is attached to the base and holds a light source that emits light to be applied to an optical information medium,
In the second aspect, the holding section may have a protruding member that is formed on the base so as to protrude therefrom and has the wall face.
In the second aspect, the protruding member may have a pillar portion that protrudes from the base in a protruding direction and an arm portion that is extended from the pillar portion toward the light source holder side in a direction orthogonal to the protruding direction.
In the second aspect, the light source holder may have a light axis adjusting member and a tilt adjusting member, and in this structure, the arm portion can also be extended to a position near the tilt adjusting member so that the arm portion allows thermal conduction from the tilt adjusting member to the arm portion.
In the second aspect, the holding section may be prepared as a recessed section that is formed on the base and has the wall face and the mount face.
In the second aspect, the holding section may be prepared as a protruding member formed on the base so as to protrude therefrom and a recessed section formed on the base.
In the second aspect, even after the installation position of the light source holder holding the light source has been adjusted, the gap may have a sufficient size that allows the bonding agent to be injected therein.
In the second aspect, the first side face may be constituted by a slope face that expands along a direction in which light, released from the light source, proceeds along the light axis, and the second side face may be constituted by a plane that is extended in a direction orthogonal to, or virtually orthogonal to the proceeding direction of the light.
In the second aspect, the light source holder holding the light source may be provided with an optical element on the light-releasing side of the light source.
In the second aspect, the optical element may be prepared as a beam shaping element that is made of a glass member having a cylindrical face or a non-cylindrical face on each of the light-incident side and the light-releasing side.
In the second aspect, the light source holder may be made of a metal material.
In the second aspect, the bonding agent may be composed of a curing-type resin.
Moreover, an optical information apparatus in accordance with a third aspect of the present invention is provided with:
an optical pickup apparatus relating to the first aspect or the second aspect;
a motor that rotates the optical information medium; and
a control driving circuit that receives a signal obtained from the optical pickup apparatus, and controls and drives the motor and the light source based upon the signal.
Furthermore, an optical information recording/reproducing apparatus in accordance with a fourth aspect of the present invention is provided with:
an optical information apparatus relating to the third aspect;
a processing apparatus that performs operations based upon information obtained from the optical information apparatus; and
an output device that outputs the information obtained from the optical information apparatus and the results of operations performed by the processing apparatus.
The optical information recording/reproducing apparatus of the fourth aspect having the above-mentioned structure can constitute a computer system.
An optical information recording/reproducing apparatus in accordance with a fifth aspect of the present invention is provided with:
an optical information apparatus relating to the third aspect; and
a decoder from information to an image, which converts information obtained from the optical information apparatus to an image.
The optical information recording/reproducing apparatus of the fifth aspect having the above-mentioned structure can constitute an optical information media player.
The optical information recording/reproducing apparatus of the fifth aspect having the above-mentioned structure may be used as a car navigation system.
An optical information recording/reproducing apparatus in accordance with a sixth aspect of the present invention is provided with:
an optical information apparatus relating to the third aspect; and
a decoder from an image to information, which converts image information to information that is recordable onto the optical information medium by the optical information apparatus.
The optical information recording/reproducing apparatus of the sixth aspect having the above-mentioned structure can constitute an optical information media recorder.
Moreover, an optical information recording/reproducing apparatus in accordance with a seventh aspect of the present invention is provided with:
an optical information apparatus relating to the third aspect; and an input/output terminal used for exchange information with an external apparatus.
The optical information recording/reproducing apparatus of the seventh aspect having the above-mentioned structure can constitute an optical disc server.
In accordance with the optical pickup apparatus relating to the first aspect and the second aspect of the present invention, since the base has the holding section, the light source or the light source holder can be secured to the base without using an auxiliary member such as a plate spring, so that the optical pickup apparatus can be miniaturized. Moreover, since a bonding agent, made from, for example, a ultraviolet-ray curing resin, is applied to a gap between the holding section formed on the optical base and the light source as well as the light source holder, it becomes possible to prepare a wider contact area of the bonding agent within a small space between the optical base and the light source as well as the light source holder. In other words, since the securing strength of the light source and the light source holder to the optical base is enhanced, it becomes possible to improve the durability against an external influence, such as a drop impact.
Furthermore, since the holding section has the wall face and the mount face, heat generated from the optical element and the light source holder is effectively conducted to the base so as to be released.
In accordance with the optical information apparatus relating to the third aspect and the optical information recording/reproducing apparatuses relating to the fourth to seventh aspects of the present invention, since the above-mentioned optical pickup apparatus is installed therein, it becomes possible to provide apparatuses that are superior in durability as well as in the radiating property of the light source portion in comparison with conventional apparatuses.
Referring to the drawings, the following description will discuss an optical pickup apparatus, an optical information apparatus and an optical information recording/reproducing apparatus that form embodiments of the present invention. In the drawings, those members that have the same structures are indicated by the same reference numerals.
An optical pickup apparatus in accordance with the embodiment is an apparatus which at least reads information from a CD or a DVD, serving as an example of an optical information medium, and, preferably, writes and reads information on and from these. With respect to the information reproducing and recording operations by the optical pickup apparatus, the same operations as those of the aforementioned conventional optical pickup apparatus 30 are carried out, and the explanations thereof are omitted. Here,
In
The laser light source 101 is preferably prepared as a semiconductor laser light source; thus, it becomes possible to effectively provide an optical pickup and an optical information apparatus having the optical pickup which have a small-size, light-weight and low power consumption.
For example, as shown in
The light source holder 111 is preferably composed of a metal material such as aluminum and zinc so that the holder is made less vulnerable to deformation and damages even if an external influence such as a drop impact is imposed onto the optical pickup. Moreover, by using the metal material, heat generated from the light source 101 that is a heat generation source is effectively conducted to the light source holder 111, making it possible to improve the radiating property of the light source 101.
The optical base 110 to which a bonding agent 140, which is used for securing the light source holder 111 onto the base 110 with the light source holder 111 being held on the base 110, is applied has a holding section 130 that conducts heat, generated in the light source 101 and conducted to the light source holder 111, to the base 110.
The holding section 130 has a wall face 130a and a mount face 130b. The wall face 130a faces a first side face 115 of the light source holder 111 through a gap 132, conducts heat of the light source holder 111 to the base 110 through the bonding agent 140 and release it indirectly. The mount face 130b comes into contact with a second side face 116 of the light source holder 111, conducts the heat of the light source holder 111 to the base 110 and releases it directly.
In the holding section 130 having the above-mentioned structure, in a state where the light source holder 111 is held on the holding section 130 with the second side face 116 of the light source holder 111 being made in contact with the mount face 130b of the holding section 130, the bonding agent 140, which is injected to the gap 132, is made in contact with the first side face 115 and the wall face 130a, so that the light source holder 111 is secured onto the holding section 130.
By installing the holding section 130 in this manner, the light source holder 111 with the light source 101 attached thereto is secured to the base 110 by the bonding agent 140 injected to the gap 132, and since the light source holder 111 is placed close to each wall face 130a through the gap 132 so as to be made face to face therewith and also directly made in contact with the mount face 130b, the holding section 130 functions so as to efficiently remove the heat of the light source holder 111.
As will be described below, since the gap 132 forms a space having a minute value, each first side face 115 of the light source holder 111 and each wall face 130a of the holding section 130 are closely placed face to face with each other. Consequently, the radiating effect of the light source holder 111 to the base 110 through the wall face 130a, as described above, can be improved.
Here, the size of the gap 132 is determined based upon the following reasons, and the size of the gap 132 may also be determined from the viewpoint of improving the heat radiating property of the light source holder 111 from the first side face 115 to the wall face 130a.
The light source holder 111, housed in the holding section 130, is made in contact with the optical base 110 through planes of the second side face 116 and the mount face 130b, and allowed to freely slide vertical and lateral directions in
The above-mentioned bonding agent 140 which is made from, for example, a ultraviolet-ray curing resin is injected to the gap 132 so as to be continuously located in contact with at least the two faces of the side face 130a of the rib 131 and the first side face 115 of the light source holder 111. Thus, it becomes possible to prepare a wide contact area without occupying a large space on the optical base 110. With this structure, even in the case when an external influence such as a drop impact is exerted on the optical pickup in X and Y-directions of
In the first embodiment, the bonding agent 140 of the ultraviolet-ray curing resin is supposed to be made in contact with each of the wall faces 130a of the rib 131 and each of the first side faces 115 of the light source holder 111. However, this may be made in contact with the optical base 110 and other parts, or the other face of the rib 131, or the other face of the light source holder 111. Moreover, as shown in
Moreover, in the first embodiment, the bonding agent 140 of an ultraviolet-ray curing agent (hereinafter, referred to also as “ultraviolet-ray curing resin 140”) is used for a securing purpose; however, this agent may be made from a curing-type resin that is cured by applying an external influence to a flowable resin, such as a thermosetting resin, an anaerobic resin and a moisture-curing resin, and any bonding agent having the same effects may be used. Moreover, from the viewpoint of heat radiation, this agent is preferably made from a material having a high heat conductivity.
Moreover, in the first embodiment, the ribs 131 formed on the optical base 110 are molded integrally with the base 110. However, not limited to this structure, another structure in which another supporting member is secured to the optical base 110 through a method such as welding and bonding may be used with the same effects.
In the first embodiment, the second side face 116 of the light source holder 111 is supposed to be made in contact with the mount face 130b of the optical base 110 through a plane; however, as shown in
Moreover, the first side faces 115 forms a side face opposing to the wall face 130a of the holding section 130 as described above; therefore, for example, in the case when, as indicated by a two-dots chain line in
Moreover, the ribs 131 shown in
As will be described below, the mode for constructing the holding section 130 is not limited by the method using the rib 131.
In other words, as shown in
Moreover, as shown in
In the case when the holding section 130 is formed by the protruding members 131-2 having the above-mentioned bent shape and the recessed section 133, each wall face 130a of the holding section 130 is constituted by the inner face 1331 of the recessed section 133, a wall face 1311a of the pillar portion 1311 and a wall face 1312a of the arm portion 1312. Moreover, the arm portion 1312 is extended in a manner so as to cover one portion of the light source holder 111. Here, the first side face 115 of the light source holder 111 serves as the side face opposing to the wall face 130a of the holding section 130, as described earlier. Therefore, in this mode, each of the side faces of the light source holder 111 that oppose to the wall face 1311a and the wall face 1312a, and are indicated by reference numerals 115-1, 115-2 and 115-3, corresponds to the first side face 115.
Moreover, in the case when the holding section 130 is formed by the protruding members 131-2 and the recessed section 133, as shown in
As described above, by forming the holding section 130 in a manner so as to include the protruding members 131-2 having a bent shape, the total area of the wall face 130a of the holding section 130 can be made larger in comparison with the structure provided with the ribs 131. Therefore, the area that can be coated with the bonding agent 140 and the area that is used for heat conduction are made larger, so that the holding section 130 is allowed to hold the light source holder 111 more firmly and the heat releasing efficiency of the light source holder 111 can be further enhanced.
As one modified example of the mode shown in
As another modified example, a structure in which, as shown in
By using this structure, the bonding agent 140 can be placed in the gap 132 between the first side face 115-1 of the light source holder 111 and the wall face 1311a of the protruding member 131-2 as well as in the gap 132 between the first side face 115-3 of the light source holder 111 and the wall face 1312a of the protruding member 131-2. Here, the arm portion 1312 supports the foot portion 117 of the light source holder 111 through the bonding agent 140. Therefore, this structure allows the holding section 130 to hold and secure the light source molder 111 more firmly in comparison with the structure shown in
The above-mentioned embodiment has discussed the structure in which the holding section 130 is formed by the protruding members 131-2 and the recessed section 133; however, as another modified example, a structure in which, as shown in
Moreover, in the first embodiment, the light source 101 is supposed to be held on the light source holder 111; however, as shown in
In the holding sections 130 shown in
In this case, the light source 101 has a first side face 101a that faces a wall face 130a of a holding section 130 through a gap 132 and corresponds to the first side face 115, and a second side face 101b that is directly made in contact with the mount face 130b of the holding section 130 and corresponds to the second side face 116.
Moreover, in the first embodiment, the light source 101 is prepared as the laser light source that emits a laser light beam having, for example, a wavelength of λ. However, the wavelength may have a value other than this, and a light source other than the semiconductor laser may be used.
Furthermore, in the first embodiment, the light source 101 is supposed to be secured to the light source holder 111 by using an ultraviolet-ray curing resin. However, the light source 101 may be inserted to the light source holder 111, for example, through a press-fit mode or a gap-fit mode, and secured by using another member such as a plate spring, as long as it has the structure such that a large load is not applied to the outer shape of the laser light source 101.
Moreover, in the first embodiment, the light source holder 111 is supposed to be made of a metal material. However, a resin material such as PPS (polystyrene) may be used. The use of the resin material makes it possible to achieve a light-weight apparatus, although the heat conductivity becomes inferior to that of the metal material.
In the aforementioned first embodiment, the light source holder 111, which is formed by a single member, has the structure that is not capable of carrying out a so-called tilt adjustment of the light axis, although it can be shifted in X and Y-directions for adjustments of the installation position. In contrast, in the present second embodiment, the light source holder has a structure that is capable of the tilt adjustment.
In other words, as shown in
The light source 101 is secured to the light source tilt holder 1121 by using the same method as that of the first embodiment, and the light source tilt holder 1121 is made in contact with the light axis adjusting holder 1122 in a manner so as to freely rock thereon. In other words, the light source holder 112 has a structure in which an arc face of the light source tilt holder 1121 is fitted into a cone portion of the light axis adjusting holder 1122. The arc face is made in line-contact with the cone portion, so that the light source tilt holder 1121 is allowed to rock on the light axis adjusting holder 1122.
With this arrangement, in the case when each of the light sources 101 has a tilt in the light-emitting angle upon production, the light source tilt holder 1121 can be tilt-adjusted along θx and θy axes with respect to the light axis adjusting holders 1122, so that the light-emitting angle can be adjusted to a desired angle for each light source tilt holder 1121. After the light-emitting angle adjustment, a second side face 116 of the light axis adjusting holder 1122 is made in plane-contact with the mount face 130b of the optical base 110 in the same manner as the aforementioned light source holder 111. Thus, the light axis adjusting holder 1122 is allowed to freely slide in vertical and lateral directions in
With this arrangement, the light source 101 is subjected to both of deviation adjustments of its light-emitting angle and the light-axis adjustment of the optical pickup upon assembling the optical pickup, and after these adjustments, it achieves the same effects as those shown in the first embodiment. In other words, the light axis adjusting holder 1122 is made free from positional deviations with respect to the base 110 even if an external influence such as a drop impact is imposed onto the optical pickup, and the resulting effect is that after light axis adjustments for positional deviations of the light source 101, the light axis becomes free from deviations.
Moreover, in the present second embodiment also, the structures of the modified examples shown in
From these viewpoints, structures, shown in
In the third embodiment, the first side face 115 of the light source holder 111 is formed as a slope that expands from the light source side toward the optical base side, that is, as a wide slope face 115a that expands in a direction 101d in which light proceeds along the light axis 101e of light 101c that is emitted from the light source 101. The light source holder 111 is secured to the optical base 110 by the ultraviolet-ray curing agent 140 that is applied to the gap 132 between the first side face 115 having the slope face of the light source holder 111 and each rib 131 formed on the optical base 110.
In this structure, in the case when an external influence such as a drop impact, for example, a force 105 that is exerted to drop the light source holder 111 from the base 110 is imposed on the optical pickup, if no deformation or damage occurs in the ultraviolet-ray curing resin 140, the light source holder 111 itself has to be deformed or damaged in order that the light source holder 111 comes off from the optical base 110 because of the slope direction of the first side face 115 forming the slope face 115a. Therefore, when the light source holder 111 is formed by using a material having high strength, such as a metal material and a resin material, the securing property of the light source holder 111 to the optical base 110 can be enhanced.
Moreover, in the third embodiment, in the same manner as the second embodiment, the light source holder 111 may be constituted by the light source tilt holder 1121 and the light axis adjusting holder 1122, with a slope being formed on the first side face 115 of the light axis adjusting holder 1122 in the same manner as the third embodiment. With this structure, the same effects as those of the first embodiment and the second embodiment can be obtained in the present third embodiment as well.
Moreover, in the present third embodiment also, the structures of the modified examples shown in
In the present forth embodiment, in addition to a laser light source 101, an optical element 102 is integrally installed on the light source holder 111 on the light-emitting side of the light source 101. In the present forth embodiment, for example, a beam shaping element is used as one example of the optical element 102. Laser light 101c emitted from the light source 101 forms a far field pattern. The beam shaping element, which is an element made of a glass member, shapes the intensity distribution of the laser light 101c emitted from the light source 101 with an elliptical shape into a virtually round shape. In the present forth embodiment, a light-incident side face 102a of the beam shaping element is formed into a non-cylindrical face, while a light-releasing side face 102b is formed into a cylindrical face. Here, with respect to the shapes of the light-incident side face 102a and the light-releasing side face 102b, not limited by the above-mentioned mode, both of the faces may be formed into cylindrical faces or non-cylindrical faces.
With this structure, the beam shaping element 102 can be placed very closely to the laser light source 101. Thus, even in the case when the light source holder 111 is thermally expanded upon a change in the ambient temperature of the optical pickup, the change in the distance between the laser light source 101 and the beam shaping element 102 can be minimized.
In the present forth embodiment as well, the base 110 is provided with the holding section 130, and the light source holder 111 and the optical base 110 are secured by the curing-type resin 140 applied to the gap 132 between each rib 131 formed on the optical base 110 and the light source holder 111, so that the same effects as those of first embodiment can be obtained. In particular, in the case when a member other than the laser light source 101, such as an optical lens, is installed on the light source holder 111 as in the case of the present forth embodiment, even in a structure in which the weight of the entire light source holder is big with an external influence, such as a drop impact, being exerted thereon, that is, a structure in which a relatively large destructive force is imposed on the securing potion of the optical base 110 and the light source holder 111, it becomes possible to make the light source holder 111 less vulnerable to positional deviations with respect to the optical base 110.
The effect that the use of the holding section 130 improves the heat radiating property of the light source 101 as described in the first embodiment can also be obtained by the present forth embodiment.
Moreover, in the present forth embodiment also, the structures of the modified examples shown in
Moreover, in the above-mentioned first to fourth embodiments 1 to 4, the bonding agent 140 is applied in a manner so as not to overflow the gap 132. However, unless a limit is given to the amount of application of the bonding agent 140, the bonding agent 140 may get over each wall face 130a of the holding section 130 and the first side face 115 of the light source holder 111 to overflow the gap 132. For example, in the case of the first embodiment, the bonding agent 140 may be applied so as to be present from the gap 132 up to the first side face 115-2 of the light source holder 111 over the upper face 131a of each rib 131, as shown in
By applying the bonding agent 140 with such an amount of coat, the light source 101 or the light source holder 111 to which the light source is attached is more firmly secured to the holding section 130, and the heat radiating property from the light source 101 or the light source holder 111 to which the light source is attached to the holding section 130, that is, to the base 110, can be improved.
Next, referring to
In
In the optical information apparatus 150 having the above-mentioned structure, the optical disc 7, mounted on the turn table 152a, is rotated by the motor 152b. The optical pickup apparatus 100 is roughly shifted to a track, on which desired information is located, of the optical disc 7 by the driving device 151 of the optical pickup.
The optical pickup apparatus 100 also sends a focus error signal and a tracking error signal to the control driving circuit 153 in response to the positional relationship with the optical disc 7. The control driving circuit 153 sends a signal used for finely moving an objective lens mounted on the carriage 107 of the optical pickup apparatus 100 to the optical pickup apparatus 100 in accordance with these focus error signal and tracking error signal. Based upon the objective lens shifting signals, a focus control operation and a tracking control operation to the optical disc 7 are carried out in the optical pickup apparatus 100. Thus, the optical pickup apparatus 100 reads information from the optical disc 7, and also writes (records) and erases information to and from the optical disc 7.
Here, the optical information apparatus 150 is provided with the optical pickup apparatus 100 in which the optical pickup used for BDs and the optical pickup used for CDs and DVDs are integrally formed. However, the optical information apparatus 150 may be provided with optical pickups exclusively used for DVDs, CDs and BDs respectively, or may be an optical information apparatus 150 provided with an optical pickup apparatus in which these three kinds are desirably used in combination.
The following description will discuss various modes of an optical information recording/reproducing apparatus in which the optical information apparatus 150 explained in the above-mentioned fifth embodiment is installed. Computers, optical disc players and optical disc recorders, which are provided with the optical information apparatus 150 of the above-mentioned fifth embodiment, or adopt the above-mentioned recording/reproducing method, can stably record or reproduce information on or from different kinds of optical discs, and can be effectively used in wider applications. Here, the optical information recording/reproducing apparatus is not necessarily required to perform information recording and reproducing operations, and any apparatus may be used as long as it can at least reproduce information.
As one example of the optical information recording/reproducing apparatus, the following description will discuss an Embodiment of a computer system which is provided with the optical information apparatus 150 described in the fifth embodiment.
In
As one example of the optical information recording/reproducing apparatus, referring to
In
As another example of the optical information recording/reproducing apparatus, referring to
In
As still another example of the optical information recording/reproducing apparatus, referring to
In
Furthermore, a changer 183, which loads and unloads a plurality of optical discs 7 to and from the optical information apparatus 150, may be installed therein so that many pieces of information can be recorded and accumulated therein.
In the above-mentioned sixth to ninth embodiment, the outputting devices 163 and 178, and the liquid crystal monitor 172 are shown in
Here, by properly combining the above-mentioned first to ninth embodiments, an optical pickup apparatus, an optical information apparatus and an optical information recording/reproducing apparatus may be configured.
All the contents including the specification, claims, Figures and Abstract disclosed in Japanese Patent Application No. 2005-131957, filed on Apr. 28, 2005, are incorporated by reference herein.
Although the present invention has been fully described in connection with the preferred embodiments thereof with reference to the accompanying drawings, it is to be noted that various changes and modifications are apparent to those skilled in the art. Such changes and modifications are to be understood as included within the scope of the present invention as defined by the appended claims unless they depart therefrom.
The present invention relates to an optical information recording/reproducing apparatus that records or reproduces information on or from an optical information recording medium by applying light thereto through an optical pickup, and is applicable to wide industrial fields from computers to AV apparatuses that utilize optical discs. Thus, its industrial applicability is very wide and large.
Number | Date | Country | Kind |
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2005-131957 | Apr 2005 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP2006/308266 | 4/20/2006 | WO | 00 | 10/24/2007 |