CN1469359A - Optical head apparatus - Google Patents
Optical head apparatus Download PDFInfo
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- CN1469359A CN1469359A CNA031412769A CN03141276A CN1469359A CN 1469359 A CN1469359 A CN 1469359A CN A031412769 A CNA031412769 A CN A031412769A CN 03141276 A CN03141276 A CN 03141276A CN 1469359 A CN1469359 A CN 1469359A
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- 230000003287 optical effect Effects 0.000 title abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000009413 insulation Methods 0.000 claims description 8
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- 238000010438 heat treatment Methods 0.000 description 7
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- 239000010410 layer Substances 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000001172 regenerating effect Effects 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
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- 230000037361 pathway Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000001259 photo etching Methods 0.000 description 2
- 230000011514 reflex Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 208000031481 Pathologic Constriction Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 230000005855 radiation Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 208000037804 stenosis Diseases 0.000 description 1
- 230000036262 stenosis Effects 0.000 description 1
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Abstract
In the optical head device, IC for driving and a laser diode for DVD are connected to each other with a flexible circuit board 8. On their wiring part 82, the wide wiring pattern 92 for driving signal is formed on the surface side of a thin base material 80 having the thickness of <=10[mu]m, while on the reverse surface side of a base material 80, the wiring pattern 91 for ground is formed with the width dimension identical to that of the wiring pattern 92 for driving signal so as to superficially overlap with the wiring pattern 92 for driving signal.
Description
Technical field
The present invention relates to a kind of optical-head apparatus that LASER Light Source is connected with laser driving apparatus with flexible base plate.
Background technology
In the used optical-head apparatus of record, the regeneration of CD (compact disk) and DVD optical recording medias such as (multifunction digital CDs), to guide object lens into by light-conducting system from the ejaculation light of LASER Light Source such as laser diode, the light by object lens focusing is focused on the optical recording media.Here, object lens and lens driver that object lens are driven to tracking direction and focus direction etc. are loaded on metallic or the resinous framework, and also are mounted with the photo detector of LASER Light Source and photodiode etc. on this framework.In addition, also be mounted with on this framework the driving circuit that is formed for the driving laser light source IC, and connect the flexible base plate of this IC and LASER Light Source.
Here, flexible base plate since be subjected to frame shape, IC and LASER Light Source allocation position, and other integral arrangement on restriction, event is shown in the vertical view of the flexible base plate of Fig. 5, and the mounting portion 180 of LASER Light Source generally is formed in from the body part 181 that IC has been installed and extends into the banded part front of extending.Therefore, the ground wire that IC and LASER Light Source are electrically connected with wiring graph 191, and drive signal with wiring graph 192, be formed on the face side of the part 182 of extending of flexible base plate 108 side by side.Here, be formed with the hole 184,185 of inserting the LASER Light Source terminal on the mounting portion 180 of LASER Light Source, around it, be formed with the weld flange 194,195 that is connected with wiring graph 192 with wiring graph 191 and drive signal with ground wire simultaneously.
But, in optical-head apparatus, because overlapping interchange in the drive signal that provides with wiring graph 192 by drive signal, simultaneously, raising along with the recording density of optical recording media, the signal that is provided with wiring graph 192 by drive signal is also by high frequencyization gradually, so be formed with ground wire usefulness wiring graph 191 and drive signal side by side with wiring graph 192, the then narrowed width of wiring graph on the part 182 of extending of band shape as still picture tradition.Its result, wiring resistance increases, and exists the bigger problem of loss that heating causes.In addition, it is bigger that ground that wiring graph causes changes, thus to external noise a little less than, be easy to generate unwanted radiation.And the inductance of wiring graph is big, exists the problem of the actuating speed decline of LASER Light Source.
Summary of the invention
In view of this, the object of the present invention is to provide a kind ofly to have, make the optical-head apparatus of structure of the action high speed of LASER Light Source by reducing the resistance and the inductance of wiring graph.
In order to solve described problem, optical-head apparatus of the present invention, be that LASER Light Source, the laser driving apparatus that drives this LASER Light Source, the flexible base plate that connects this laser driving apparatus and described LASER Light Source are loaded in the optical-head apparatus on the framework, it is characterized in that, in described flexible base plate, the ground wire that described laser driving apparatus and described LASER Light Source are electrically connected with wiring graph and drive signal with wiring graph by thin insulation course and the plane is overlapping.
Structure like this, the occasion of having to make the part of extending of flexible substrate to do narrowly even be subjected to the allocation position, the restriction on other integral arrangement of frame shape, IC and LASER Light Source also can form ground wire that the partial width of extending is of a size of maximum wide cut with wiring graph and drive signal wiring graph.Therefore, ground wire makes wiring resistance less with wiring graph because of its wide cut with wiring graph and drive signal, can reduce the energy loss that heating causes.In addition, ground wire can be formed wide cut and effective inductance is reduced with wiring graph with wiring graph and drive signal,, improve the degree of freedom of wiring graph design so, also can suppress the decline of response speed to greatest extent even distribution is long.In addition, in the occasion that wiring graph is arranged side by side, even make wiring graph approaching, also because of the restriction on the photoetching technique, and the interval between the distribution can not be narrowed down to about 100 common μ m, if but insulation course then can form the following thickness of 10 μ m, so adopt the present invention, ground wire is reduced with wiring graph and the drive signal interval with wiring graph.Therefore, can suppress electromagnetic radiation.In addition, it is less that the ground that distribution causes changes, and can improve the ability for external noise.And mutual inductance also reduces, and is fit to high-speed driving.
Among the present invention, such as, described ground wire is formed at the substrate surface side and the rear side of described flexible base plate respectively with wiring graph with wiring graph and described drive signal.That is, by using double-sided substrate as flexible base plate, thereby become make ground wire with wiring graph and drive signal with wiring graph by thin insulation course and plane overlapping structure.
Among the present invention, best described ground wire forms bilayer with wiring graph, to be clamped described drive signal wiring graph by face side and rear side.So structure then has the function of screen layer with respect to drive signal with wiring graph with wiring graph owing to ground wire, so the advantages such as ability of raising for external noise arranged.
Among the present invention, described ground wire is with wiring graph and described drive signal wiring graph, also can be formed on the same one side of base material of described flexible base plate, plane overlapping for described ground wire is done by described base material with wiring graph with wiring graph and described drive signal, and with described flexible base plate bending.So structure as flexible base plate, can be used cheap single face substrate.
The simple declaration of accompanying drawing
Fig. 1 be expression to CD, CD-R, and DVD carry out the stereographic map of the optical-head apparatus of record regenerating
Fig. 2 (A), (B), (C) represent that respectively the employed flexible base plate of optical-head apparatus of the present invention the 1st embodiment and drive signal give the cut-open view of modal representation with the vertical view of the flat shape of wiring graph, the ground wire of this flexible base plate with the vertical view of the flat shape of wiring graph, with the cross section structure of this flexible base plate.
Fig. 3 (A), (B), (C), (D) represent respectively the employed flexible base plate of optical-head apparatus of the present invention the 2nd embodiment cut-open view, be illustrated in the 1st ground wire that the upper strata of this flexible base plate forms with the vertical view of the flat shape of wiring graph, be illustrated in drive signal that the middle layer of flexible base plate forms with the vertical view of the flat shape of wiring graph, be illustrated in the vertical view of flat shape of the 2nd ground wire usefulness wiring graph of lower floor's formation of flexible base plate.
Fig. 4 (A), (B), (C), (D) represent respectively before the employed flexible base plate bending of the optical-head apparatus of the present invention the 3rd embodiment vertical view, form before crooked this flexible base plate drive signal form with the cut-open view of the part of wiring graph, before crooked flexible base plate ground wire with the cut-open view of the part of wiring graph, with the flexible base plate doubling after the cut-open view of state.
Fig. 5 is the vertical view of the employed flexible base plate of the traditional optical-head apparatus of expression.
Specific embodiment
Followingly explain having used optical-head apparatus of the present invention with reference to accompanying drawing.
(the 1st embodiment)
Fig. 1 be expression to CD, CD-R, and DVD carry out the stereographic map of the optical-head apparatus of record regenerating
As shown in Figure 1, the optical-head apparatus 1 of present embodiment has resin system or metal framework 3, and this framework 3 is inserted by 2 leading axles (not shown) that are arranged in parallel with respect to equipment and led in connecting portion 301,302,303, and it can be moved along leading axle.
The side surface part 32 of this framework 3 is mounted with DVD laser diode 4 and CD laser diode 5.That is, DVD with laser diode 4, CD with diode 5 respectively under the state in the holder 6,7 that is fixed in double as heating radiator and position adjustments member, be fixed in the side of framework 3 with cementing agent.Here, DVD is used for the record regenerating of DVD with laser diode 4, and penetrating wavelength is the laser of 650nm or 635nm.On the other hand, CD is used for record, the regeneration of CD and CD-R with laser diode 5, and penetrating wavelength is the laser of 780～800nm.
Although not shown, photo detector, sensor leads, light-conducting system, collimation lens, and optical element such as static reflex mirror are housed on framework 3, above the static reflex mirror, dispose the object lens 9 that penetrate laser towards optical recording media (not shown).Therefore,, be drawn towards the common optical pathways of described optical element defined, utilize this common optical pathways, can carry out all records and the regeneration of CD, CD-R, DVD from the laser that each laser diode 4,5 penetrates.And, also be provided with the objective lens device 50 that object lens 9 are driven towards focus direction and tracking direction in the framework 3.As this objective lens device 50, used the drive unit of axle slip rotation in the present embodiment.
In the optical-head apparatus 1 of structure like this,, be mounted with flexible base plate 8 on the framework 3 in order to drive DVD with laser diode 4 and CD laser diode 5 etc.Here, framework 3 is for viewpoints such as the layout of optical system and lightweights and can be designed to different shape, and the shape of flexible base plate 8 is decided according to the shape of framework 3.
Such as, in the present embodiment, 31 form wide and smooth zone on framework 3, from there, towards the side surface part 32 of DVD with the framework 3 of laser diode 4 is installed, and form than top 32 low 1 grade stage portion 33 also.
Fig. 2 (A), (B), (C) represent respectively the employed flexible base plate of optical-head apparatus of the present invention the 1st embodiment and drive signal with the ground wire of the vertical view of the flat shape of wiring graph, this flexible base plate with the vertical view of the flat shape of wiring graph and the cross section structure of this flexible base plate is given the cut-open view of modal representation.
Among Fig. 1, flexible base plate 8 has the corresponding shape such as shape with framework 3, also has to overlap above the framework 3 31 body 81, make the banded part 82 of extending that extends to framework 3 side surface part 32, and in this front of extending part 82 installation portion 80 of DVD with laser diode 4 be installed from this body 81.In addition, flexible base plate 8 has the fixed part 89 that stretches out to the both sides rectangle in the half-way of the part 82 of extending, to be used for that the part 82 of extending is fixed in stage portion 33.
The IC2 (laser driving apparatus) that drives usefulness is installed on the body 81 of flexible base plate 8, is covered with in the top position of the IC2 of this driving usefulness with screw 22 and is fixed on heat sink 21 on the framework 3.Therefore, the heat that IC2 took place spreads by heat sink 21.And IC2 and heat sink 21 are configured in the top 31 of framework 3, and at this place, regional top position, optical recording media is rotated.Therefore, heat sink 21 is by the air-flow that rotation produced of optical recording media and effectively dispelled the heat, and the reliability of optical-head apparatus 1 is enhanced.
In the present embodiment, as flexible base plate 8, used the double-sided substrate shown in Fig. 2 (A), (B), (C), the part 82 of extending for flexible base plate 8, at thickness is the face side of the thin base material 801 below the 10 μ m drive signal that is formed with wide cut with wiring graph 92, on the other hand, for plane overlapping with wiring graph 92, be formed with the ground wire usefulness wiring graph 91 that has the same widths size with drive signal with wiring graph 92 in the rear side of base material 80 with drive signal.
In addition, in the installation portion 80 of flexible base plate 8, be formed with and insert the hole 84,85 of DVD with laser diode 4 terminals, simultaneously, in the hole 84,85 around form weld flange 94,95.In these weld flanges 94,95, weld flange 95 is integrally formed with wiring graph 92 in the face side and the drive signal of base material 801, and on the other hand, weld flange 94 is connected with the ground configurations 91 of rear side by being formed on the through hole 811 on the base material 801.
In addition, be formed with many weld flanges that IC2 can be installed on the body 81 of flexible base plate 8, in these weld flanges, the weld flange 96 of output drive signal, be integrally formed in the face side of base material 801 with wiring graph 92 with drive signal, on the other hand, keep the weld flange 97 of ground wire current potential, be connected with the ground wire wiring graph 91 of rear side by being formed on the through hole 812 on the base material 801.And in flexible base plate 8, its face side is formed with scolder protective seam 805 for avoiding weld flange 94,95,96, and the roughly whole face of side is formed with scolder protective seam 806 overleaf.
So, in the optical-head apparatus 1 of present embodiment, though be subjected to shape, IC2 and the DVD of framework 3 with the allocation position of laser diode 4, and other integral arrangement on restriction and with the narrow width of the part 82 of extending of flexible base plate 8, but, for make drive signal with wiring graph 92 and ground wire with wiring graph 91 plane overlapping face side and the rear side that are formed on flexible base plate 8 separately.Therefore, but, wiring resistance is reduced, so can reduce the energy loss that heating causes because ground wire forms with wiring graph 92 wide cuts with wiring graph 91 and drive signal.In addition, effective inductance is reduced,, improve the degree of freedom of wiring graph design so, also can suppress the decline of response speed to greatest extent even distribution is long owing to ground wire forms wide cut with wiring graph 91 and drive signal with wiring graph 92.In addition, in the occasion that wiring graph is arranged side by side, even it is distribution is approaching, because of the restriction on the photoetching technique, and the interval between the distribution can not be narrowed down to about 100 common μ m, but, can form the following thickness of 10 μ m for base material 801 as insulation course, so among the present invention, ground wire is reduced with wiring graph 91 and the interval of drive signal with wiring graph 92.Therefore, can suppress electromagnetic radiation from distribution.In addition, it is less that the ground that distribution causes changes, and can improve the ability for external noise.And mutual inductance also reduces, and is fit to high-speed driving.
(the 2nd embodiment)
Fig. 3 (A), (B), (C), (D) represent respectively the employed flexible base plate of optical-head apparatus of the 2nd embodiment of the present invention cut-open view, be illustrated in the 1st ground wire that the upper strata of this flexible base plate forms with the vertical view of the flat shape of wiring graph, be illustrated in drive signal that the middle layer of flexible base plate forms with the vertical view of the flat shape of wiring graph, be illustrated in the vertical view of flat shape of the 2nd ground wire usefulness wiring graph of lower floor's formation of flexible base plate.
Shown in Fig. 1 and Fig. 3 (A), (B), (C), (D), the employed flexible base plate 8 of the optical-head apparatus of present embodiment, also have overlap framework 3 top 31 on body 81, make the banded part 82 of extending that extends to the side surface part 32 of framework 3, and the installation portion 80 of DVD with laser diode 4 be installed from this body 81 in this front of extending part 82.In addition, flexible base plate 8 has the fixed part 89 that stretches out to the both sides rectangle that is used for the part 82 of extending is fixed in stage portion 33 in the half-way of the part 82 of extending.
In the present embodiment, used multilager base plate as flexible base plate 8, the part 82 of extending at flexible base plate 8, at thickness is the face side of the 1st thin base material 802 below the 10 μ m, be formed with the 1st ground wire wiring graph 911 of wide cut, on the other hand, for overlapping with wiring graph 911 planes, be formed with the drive signal usefulness wiring graph 92 that has the same widths size with the 1st ground wire with wiring graph 911 in the rear side of the 1st base material 802 with the 1st ground wire.
In addition, in the flexible base plate 8 of present embodiment, drive signal is formed on the face side of the 2nd base material 803 with wiring graph 92, for overlapping with wiring graph 92 planes, be formed with the 2nd ground wire usefulness wiring graph 912 that has the same widths size with drive signal with wiring graph 92 in the rear side of the 2nd base material 803 with drive signal.
In addition, on the installation portion 80 of flexible base plate 8, be formed with weld flange 94,95 on every side with the hole 84,85 of laser diode 4 terminals inserting DVD.In these weld flanges 94,95, weld flange 94 is integrally formed with wiring graph 911 with the 1st ground wire that is formed on the 1st base material 802 face side, and weld flange 94 is by through hole 815 and be electrically connected with the 2nd ground wire wiring graph 912 of the rear side that is formed on the 2nd base material 803.And weld flange 95 then is electrically connected with wiring graph 92 with the drive signal that is formed on the 1st base material 802 rear side by through hole 816.
In addition, be formed with many weld flanges that IC2 can be installed in the body 81 of flexible base plate 8, in these weld flanges, the weld flange 97 of output drive signal is integrally formed with wiring graph 911 with the 1st ground wire that is formed on the 1st base material 802 face side, and weld flange 97 is electrically connected with the 2nd ground wire wiring graph 912 that is formed on the 2nd base material 803 rear side by through hole 817.And weld flange 96 then is electrically connected with wiring graph 92 with the drive signal that is formed on the 1st base material 802 rear side by through hole 818.
And in flexible base plate 8, its face side is formed with scolder protective seam 805 for avoiding weld flange 94,95,96,97, and side roughly is formed with scolder protective seam 806 comprehensively overleaf.
So, the optical-head apparatus 1 of present embodiment, even the width of the part 82 of extending of flexible base plate 8 is the occasions that become narrow of having to, because the 1st ground wire forms the overlapping different layer in mutual planes with wiring graph the 911, the 2nd ground wire wiring graph 912, drive signal with wiring graph 92, so but the 1st ground wire uses wiring graph 92 wide cuts to form with wiring graph the 911, the 2nd ground wire with wiring graph 912, drive signal.Therefore, the 1st ground wire is wide cuts with wiring graph 912, drive signal with wiring graph 92 with wiring graph the 911, the 2nd ground wire, and wiring resistance is reduced, so can reduce the energy loss that heating causes.In addition, for base material 802,802 as insulation course, can form the following thickness of 10 μ m, so the 1st ground wire is narrower with the interval of wiring graph 92 with wiring graph 912 and drive signal with interval, the 2nd ground wire of wiring graph 92 with wiring graph 911 and drive signal.Therefore, can suppress electromagnetic radiation etc., play the effect identical with the 1st embodiment.
In addition, drive signal wiring graph 92, its face side and rear side are clamped with wiring graph 912 with wiring graph 911 and the 2nd ground wire by the 1st ground wire, so the 1st ground wire wiring graph 911 and the 2nd ground wire wiring graph 912, has the function of screen layer with respect to drive signal with wiring graph 92, so have the advantages such as ability of raising for external noise.
(the 3rd embodiment)
Fig. 4 (A), (B), (C), (D) represent respectively before the employed flexible base plate bending of the optical-head apparatus of the present invention the 3rd embodiment vertical view, form before crooked this flexible base plate drive signal form with the cut-open view of the part of wiring graph, before crooked flexible base plate ground wire with the cut-open view of the part of wiring graph, with the flexible base plate doubling after the cut-open view of state.
Among Fig. 1, the flexible base plate 8 that uses in the optical-head apparatus of present embodiment also has from this body 81 and makes the banded part 82 of extending that extends to the side surface part 32 of framework 3.
Here, flexible base plate 8 extend part 82 shown in Fig. 4 (A), 2 of the part doublings of the roughly 2 times of width dimensions by will having part of extending 82 form.Promptly, in the present embodiment, flexible base plate 82 is shown in Fig. 4 (B), (C), form by the single face substrate, this single face substrate be thickness be the face side of the thin base material 808 below the 10 μ m be formed with side by side with identical width dimensions drive signal with wiring graph 92 and ground wire with wiring graph 91, the position of substrate 82 at the dot-and-dash line L shown in Fig. 4 (A) bent towards rear side, and, shown in Fig. 4 (D), be stained with cementing agent 88 grades and form the part 82 of extending.Therefore, in the present embodiment, ground wire with wiring graph 91, drive signal with wiring graph 92 by base material 808 and the plane is overlapping mutually.And drive signal is formed with scolder protective seam 809 with wiring graph 92, ground wire with the upper strata of wiring graph 91.
Even so the part 82 of extending of the flexible base plate 8 of structure, because drive signal is positioned at the face side and the rear side of flexible base plate 8 separately with wiring graph 91 with wiring graph 92 and ground wire, even the width stenosis of part 82 so extend, but ground wire can form wide cut with wiring graph 91 and drive signal with wiring graph 92, therefore, wiring resistance reduces, and can reduce the energy loss that heating causes.In addition, for base material 808 as insulation course, can form the following thickness of 10 μ m, so can will be suppressed at below the 20 μ m (bilayer thickness that is equivalent to base material 808 adds the thickness of cementing agent 88) with the thickness of the insulation course between the wiring graph 92 with wiring graph 91 and drive signal as being clipped in ground wire, so can suppress electromagnetic radiation etc., play the effect identical with the 1st embodiment.
And, in the present embodiment, used single layer substrate, can the cheap advantage of making flexible base plate 8 so have.
(other embodiment)
The foregoing description is, applies the present invention to IC2 and the DVD coupling part with laser diode 4, and the present invention also can be applicable to the coupling part of IC2 and CD usefulness laser diode 5.
As mentioned above, in the present invention, even be subjected to the restriction of frame shape etc. and have to make the narrow occasion of the part of extending of flexible base plate, the ground wire that also can form wide cut is with wiring graph and drive signal wiring graph.Therefore, wiring resistance is little, can reduce the energy loss that heating causes.In addition, ground wire forms wide cut and effective inductance is reduced with wiring graph with wiring graph and drive signal, so even distribution is long, also can suppress the decline of response speed to greatest extent, improves the degree of freedom of wiring graph design.In addition, ground wire is reduced with wiring graph and the drive signal interval with wiring graph, therefore can suppress electromagnetic radiation.In addition, it is less that the ground that distribution causes changes, and can improve the ability for external noise.And mutual inductance also reduces, and is fit to high-speed driving.
Claims (4)
1. optical-head apparatus is that LASER Light Source, the laser driving apparatus that drives this LASER Light Source, the flexible base plate that connects this laser driving apparatus and described LASER Light Source are loaded in the optical-head apparatus on the framework, it is characterized in that,
In the described flexible base plate, the ground wire that described laser driving apparatus and described LASER Light Source are electrically connected with wiring graph and drive signal with wiring graph by thin insulation course and plane overlapping.
2. optical-head apparatus according to claim 1 is characterized in that, described ground wire is formed at the face side and the rear side of the base material of described flexible base plate respectively with wiring graph with wiring graph and described drive signal.
3. according to the described optical-head apparatus of claim 1, it is characterized in that described ground wire wiring graph forms bilayer for clamping described drive signal by face side and rear side with wiring graph.
4. optical-head apparatus according to claim 1 is characterized in that, described ground wire is with wiring graph and described drive signal wiring graph, be formed on the same one side of base material of described flexible base plate,
Described flexible base plate is bent into: described ground wire with wiring graph and described drive signal usefulness wiring graph by described base material and plane overlapping.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002161691A JP4029008B2 (en) | 2002-06-03 | 2002-06-03 | Optical head device |
| JP2002161691 | 2002-06-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1469359A true CN1469359A (en) | 2004-01-21 |
| CN1209761C CN1209761C (en) | 2005-07-06 |
Family
ID=29996383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03141276 Expired - Fee Related CN1209761C (en) | 2002-06-03 | 2003-06-03 | Optical head apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4029008B2 (en) |
| CN (1) | CN1209761C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1331120C (en) * | 2004-04-09 | 2007-08-08 | 三洋电机株式会社 | Pickup device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005235332A (en) | 2004-02-20 | 2005-09-02 | Sanyo Electric Co Ltd | Wiring apparatus for optical head system |
| JP4756840B2 (en) * | 2004-09-13 | 2011-08-24 | 三菱電機株式会社 | CAN PACKAGE OPTICAL SEMICONDUCTOR DEVICE AND OPTICAL MODULE |
-
2002
- 2002-06-03 JP JP2002161691A patent/JP4029008B2/en not_active Expired - Fee Related
-
2003
- 2003-06-03 CN CN 03141276 patent/CN1209761C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1331120C (en) * | 2004-04-09 | 2007-08-08 | 三洋电机株式会社 | Pickup device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1209761C (en) | 2005-07-06 |
| JP2004013935A (en) | 2004-01-15 |
| JP4029008B2 (en) | 2008-01-09 |
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Owner name: NIDEC SANKYO CORP. Free format text: FORMER NAME OR ADDRESS: SANKYO SEIKI MFG. SEISAKUSHO K.K. |
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| CP01 | Change in the name or title of a patent holder |
Address after: Japan, Suwa, Nagano Patentee after: Sankyo Seiki Seisakusho KK Address before: Japan, Suwa, Nagano Patentee before: Sankyo Seiki Manufacturing Co., Ltd. |
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Granted publication date: 20050706 Termination date: 20100603 |