CN100437781C - Optical head and optical pickup device - Google Patents
Optical head and optical pickup device Download PDFInfo
- Publication number
- CN100437781C CN100437781C CNB2006101007253A CN200610100725A CN100437781C CN 100437781 C CN100437781 C CN 100437781C CN B2006101007253 A CNB2006101007253 A CN B2006101007253A CN 200610100725 A CN200610100725 A CN 200610100725A CN 100437781 C CN100437781 C CN 100437781C
- Authority
- CN
- China
- Prior art keywords
- laser
- optical head
- stent
- head
- abutting part
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Optical Head (AREA)
Abstract
An optical head comprises a laser holder retaining a laser diode, and a holder support retaining the laser holder, and irradiates an information storage medium with laser light from the laser diode to perform recording/reproduction of information. In this optical head, the laser holder is a frame structure that fixes the laser diode, having an abutment portion protruding from a base side of the frame structure. Also, the holder support has a receiving surface that supports by abutment the abutment portion, and a through-hole that lets pass the laser light. The receiving surface is a plane approximately perpendicular to an optical axis of the optical head, the abutment portion being made as an arc surface having a central axis that passes through an emission point of the laser diode and is perpendicular to the optical axis.
Description
The application requires the spy of on June 30th, 2005 in Japanese publication to be willing to the right of priority of 2005-192412.By carrying out this explanation, thereby its full content is referred among the application.
Technical field
The present invention relates to a kind of optic pick-up that has the optical head of the structure that is used to carry out the laser beam axis adjustment and use this optical head.
Background technology
Optic pick-up constitutes, and shines on the information recording carrier after making the laser that sends from laser diode by collimating mirror, beam shaping prism, object lens etc., will be utilized photodetector to read as light signal by the reflected light of information recording carrier surface reflection.
Laser forms directional light by collimating mirror, is shaped to circular light beam by beam shaping prism, and by behind the optical splitter by object lens focusing, shine on the information recording carrier.Reflected light by the information recording carrier reflection reflects along right angle orientation in optical splitter by object lens, and is received by photodetector.Like this, for laser is disposed the form of each optical element with the optical axis unanimity by certain light path.
The laser diode of emission laser is configured to make the optical axis of laser consistent with the optical axis of optic pick-up, but owing to various products are different so there is deviation in the optical axis of laser diode, therefore needs the setting angle and the position of product ground adjustment laser diode one by one.
Therefore, be fixed with the structure that is provided for adjusting laser beam axis on the optical head of laser diode.
With reference to Fig. 9 to Figure 11 the optical axis of the optical head of optic pick-up in the prior art being adjusted dependency structure describes.
Fig. 9 is the skeleton diagram of the optical head of prior art example 1.Figure 10 is the skeleton diagram of the optical head of prior art example 2.Figure 11 is the skeleton diagram of the optical head of prior art example 3.
For example, the optical head 101 of prior art example 1 comprises laser diode 111, keep the support 121 of laser diode 111 and support 121 is fixed on breakout box 131 on the shell 141, support 121 is fixed on the breakout box 131 by support gib screw 171, and breakout box 131 is fixed on the shell 141 by breakout box gib screw 181.By screwing out or screw in this support gib screw 171 support 121 is tilted, thereby adjust the gradient of laser diode 111, in addition, by adjusting breakout box gib screw 181, support 121 and breakout box 131 moved the position (with reference to Japanese patent laid-open 2-294949 communique) of adjusting laser diode 111.
Optical head 201 in the prior art example 2 comprises: laser diode 211, adjust laser diode 211 gradient adjustment plate 221 and laser diode 211 is fixed on the fixed head of adjusting on the plate 221 291.Adjust the plate shaped U word shape that becomes of plate 221, a side par is fixed on the shell 231, and the substantial middle portion in two side pars is provided with peristome 223, and embedding is fixed with laser diode 211.The end that U word shape is adjusted plate 221 is provided with adjustment screw 271, can strengthen or dwindle the U word space by screwing out or screwing in this adjustment screw 271, adjusts the depth of parallelism of U word, thereby can adjust the gradient of laser diode 211.In addition, the diameter of peristome 223 is bigger slightly than the diameter of laser diode 211, therefore can adjust the position (with reference to No. 2835778 communique of Japanese Patent Laid) of laser diode 211.
But in the prior art example, the optical axis adjustment is all very loaded down with trivial details, need expend the adjustment time.Particularly, in prior art example 1, when carrying out the optical axis adjustment, need to screw out or screw in each screw 171,181, so can expend time in.In addition, by screwing out or screw in support gib screw 171 support 121 is tilted, and then laser diode 111 is tilted, but can cause the luminous point position of laser diode 111 to change this moment.That is, can be that move at the center with the fulcrum, so be fixed on the luminous point of the laser diode 111 on the support 121 because support 121 is that fulcrum tilts with a side support gib screw 171.Therefore, even in the time only need adjusting the laser gradient, also must carry out the position adjustment simultaneously.
In prior art example 2, when adjusting the gradient of laser diode 211, have available one and adjust the advantage that screw 271 is adjusted, but owing to adjusting the end of plate 221 with a side opposite with adjusting screw 272 present positions is that fulcrum tilts, so existence is fixed on the problem that the luminous point position of the laser diode 211 on the adjustment plate 221 changes.In addition, when carrying out the position adjustment, still need to screw out or screw in the screw of fixed head 291, so can expend time in.
In prior art example 3, though the luminous point position of laser diode 311 can not change, when adjusting in the position of carrying out laser diode 311, need to remove with being connected of the shell that is fixed with holder 321 after just can carry out the position adjustment, so can expend time in.
Summary of the invention
In view of this situation, the invention provides and easily carry out optical head and the optic pick-up that optical axis is adjusted under a kind of situation that can not change at the optical axis direction of the relative optical head of luminous point position.
Optical head of the present invention, comprise and keep laser diodes device support, and the stent support platform that keeps this laser stent, be used for to shine from described laser diodes and carry out recording of information/regeneration on the information recording carrier, it is characterized in that, described laser stent is the framework of fixing described laser diode, has the abutting part that is darted at this framework bottom, described stent support platform has the through hole that butt supports the supporting surface of described abutting part and described laser is passed through, described supporting surface is the plane with the optical axis approximate vertical of described optical head, described abutting part is the arc surface with following central shaft, the luminous point of this central shaft by described laser diode and vertical with described optical axis.
Adopt this formation, even tilt because of the laser beam axis adjustment makes laser stent, laser stent also rotates relative to central shaft, so the position of luminous point can not change on the optical axis direction of optical head.In the prior art, during owing to change laser stent angle, the position of luminous point changes on the optical axis direction of optical head, so each angle all needs to carry out the position adjustment of luminous point when changing, but the present invention can simplify this operation.
Because of supporting surface is plane with the optical axis approximate vertical, so even the abutting part of laser stent and supporting surface butt ground move, the position of luminous point can not change on the optical axis direction of optical head yet.That is, even carry out angular setting and position adjustment, the position of luminous point on the optical axis direction of optical head can not change yet, and therefore, can carry out angular setting and position adjustment simultaneously, thereby can adjust operation sleekly.
Because laser stent is not fixed on the stent support platform by connecting elements such as screws, so can reduce component parts.In addition, when carrying out the adjustment of angular setting or position, need not screw in or screw out screw etc., adjust the activity duration so can shorten.
Because the supporting surface of stent support platform is the plane,, suppress manufacturing cost very low so can easily carry out high-precision processing.
In addition, optical head of the present invention is characterized in that, described abutting part forms a pair of on two relative positions of described framework respectively.
Adopt this formation, because therefore abutting part and supporting surface butt that the laser stent utilization separately is set up in parallel can stably be supported on the stent support platform on two relative positions.
In addition, optical head of the present invention, it is characterized in that described laser stent has the head corresponding with described abutting part on the head relative with described bottom, described stent support platform has press device from described head to the direction that makes described abutting part push described supporting surface that push.
Adopt this formation, device is pushed and is supported on the stent support platform because laser stent is pressed, so can be all the time the posture of laser stent be remained necessarily, is easy to carry out the position adjustment and the angular setting of laser stent, and also is easy to carry out adjusted operation.That is,, then need to utilize temporary fixed adjusted states such as anchor clamps, but that the present invention does not need to carry out is this temporary fixed if adopt the structure to keep the laser stent posture.
Device is not pushed from the direction except that the optical axis direction of optical head (the vertical direction of optical head optical axis relatively) because laser stent is pressed, thus can on perpendicular to the direction of optical axis, easily move, and laser stent is tilted.
In addition, optical head of the present invention is characterized in that, described head is the projection that is made of the arc surface with described central shaft, and described press device constitutes and utilizes the pressing member with plane press surface vertical with described optical axis to push described head.
Adopt this formation, because abutting part and head constitute by having by luminous point and perpendicular to the arc surface of the central shaft of optical axis, even so laser stent is tilted, laser stent also rotates relative to central shaft, therefore, the distance of the abutment that connects of abutting part and supporting surface and central shaft and head and the contacted distance of pushing contact and central shaft of press surface can not change.That is, abutment is certain with the distance of pushing contact, so the power at pressing member press head top can not change, can push the support laser stent with the state of all-the-time stable.
Because abutting part and head constitute by having by luminous point and perpendicular to the arc surface of the central shaft of optical axis, supporting surface is the vertical plane of relative optical axis with press surface, and it is parallel to each other, so even laser stent tilts and rotates relative to central shaft, the direction of pushing of press surface also is always optical axis direction, thereby can push the support laser stent with stable posture.
In addition, optical head of the present invention is characterized in that, the distance of the arc surface from described central shaft to described abutting part is littler than the distance of the arc surface from described central shaft to described head.
Adopt this formation,,, suppress the distance change from the luminous point to the supporting surface so can reduce the deviation of radius owing to the radius of the abutting part that is made of arc surface is less.
That is, because laser stent tilts, the abutment of abutting part and supporting surface changes, thereby when there was deviation in the radius of the abutting part that is made of arc surface, the distance from the luminous point to the supporting surface can change, but the present invention can suppress this distance change.
In addition, optical head of the present invention is characterized in that, described abutting part has the conical surface external continuously with arc surface.
Adopt this formation, by abutting part is set, can reduce the gap of laser stent and stent support platform on laser stent, thus, the heat that laser diode produces to the conduction of stent support platform, can improve the thermal diffusivity of optical head by laser stent.
In addition, optical head of the present invention, comprise and keep laser diodes device support, and the stent support platform that keeps this laser stent, be used for to shine from described laser diodes and carry out recording of information/regeneration on the information recording carrier, it is characterized in that, described laser stent is the framework of fixing described laser diode, bottom in this framework is provided with the abutting part of being equipped with the crest line portion that is formed by two crossing on the same levels, described stent support platform has the through hole that butt supports the supporting surface of described abutting part and described laser is passed through, described supporting surface is the plane with the optical axis approximate vertical of described optical head, described crest line portion and luminous point by described laser diode and consistent perpendicular to the straight line of described optical axis.
Adopt this formation, crest line portion by luminous point and with the bearing plane butt, even tilt because of the laser beam axis adjustment makes laser stent, laser stent also rotates relative to crest line portion, so the position of luminous point can not change on optical axis direction.In the prior art, because when changing the gradient of laser stent, the position of luminous point changes on optical axis direction, thus all need to carry out the position adjustment of luminous point during the change of each gradient, but the present invention can simplify this operation.
Because of supporting surface is plane with the optical axis approximate vertical, so even the abutting part of laser stent and supporting surface butt ground move, the position of luminous point can not change on optical axis direction yet.That is, even carry out angular setting or position adjustment, the position of luminous point on optical axis direction can not change yet, and therefore, can carry out angular setting and position adjustment simultaneously, thereby can adjust operation sleekly.
Owing to the part with the supporting surface butt is the crest line portion of laser stent, even laser stent tilts, the part of laser stent and supporting surface butt can not change yet, therefore, luminous point all the time with supporting surface at grade, departing from the optical axis direction can be suppressed at Min..
Because laser stent is not fixed on the stent support platform by connecting elements such as screws, so can reduce component parts.In addition, when carrying out the adjustment of angular setting or position, need not screw in or screw out screw etc., adjust the activity duration so can shorten.
Because the supporting surface of stent support platform is the plane, thus can easily carry out high-precision processing, and, owing to adjustment not being set with screw etc., so can suppress manufacturing cost.
Because abutting part is made of two planes, so can be easily and be processed to form abutting part accurately.
In addition, optical head of the present invention is characterized in that, described abutting part forms a pair of on two relative positions of described framework respectively.
Adopt this formation, because therefore crest line portion and supporting surface butt that the laser stent utilization separately is set up in parallel can stably be supported on the stent support platform on two relative positions.
In addition, optical head of the present invention, it is characterized in that, described laser stent has the head corresponding with described abutting part on the head relative with described bottom, this head is the projection that is made of the arc surface that is central shaft with described crest line portion, and described stent support platform has and utilizes the pressing member that comprises the plane press surface vertical with described optical axis to push the device of described head.
Adopt this formation, device is pushed and is supported on the stent support platform because laser stent is pressed, so can be all the time the posture of laser stent be remained necessarily, is easy to carry out the position adjustment and the angular setting of laser stent, and also is easy to carry out adjusted operation.That is,, then need to utilize temporary fixed adjusted states such as anchor clamps, but that the present invention does not need to carry out is this temporary fixed if adopt the structure to keep the laser stent posture.
Device is not pushed from the direction except that the optical axis direction of optical head (the vertical direction of optical axis relatively) because laser stent is pressed, thus can on perpendicular to the direction of optical axis, easily move, and laser stent is tilted.
Head is made of the arc surface with central shaft consistent with crest line portion, even laser stent is tilted, laser stent also rotates relative to crest line portion, and therefore, the contacted distance of pushing contact of abutment that crest line portion and supporting surface connect and head and press surface can not change.That is, abutment is certain with the distance of pushing contact, so the power at pressing member press head top can not change, can push the support laser stent with the state of all-the-time stable.
Because head is made of the arc surface with central shaft consistent with crest line portion, supporting surface is the vertical plane of relative optical axis with press surface, and it is parallel to each other, so even laser stent tilts and rotates, the direction of pushing of press surface also is always optical axis direction, thereby can push the support laser stent with stable posture.
In addition, optical head of the present invention is characterized in that, the shell of described stent support platform and optic pick-up forms as one.
Adopt this formation, because laser stent directly is not installed on the shell of optic pick-up by the stent support tableland, thus can save part as the stent support platform, thus manufacturing cost can be reduced.
Optic pick-up of the present invention is used for the laser radiation from optical head is carried out recording of information/regeneration to information recording carrier, it is characterized in that described optical head adopts optical head of the present invention.
Adopt this formation,, adjust operating efficiency so can improve optical axis owing to can easily carry out the optical axis adjustment of the laser beam axis of optic pick-up.
Description of drawings
Fig. 1 is the stereographic map of the optical head in the embodiment of the invention 1.
Fig. 2 separates the exploded perspective view of representing with the laser stent of the optical head in the embodiment of the invention 1 and bracket supporting seat.
Fig. 3 is the general profile chart at the observed optical head of arrow A-A of laser stent central shaft state lower edge Fig. 1 consistent with the optical head central shaft.
Fig. 4 is the general profile chart at the observed optical head of arrow A-A of the state lower edge of the relative optical head inclined of laser stent central shaft Fig. 1.
Fig. 5 is the general profile chart of the observed optical head of arrow A-A of the state lower edge Fig. 1 after the laser stent central shaft moves relative to the optical head inclined and along the Y direction.
Fig. 6 dissects the general profile chart that obtains to the optical head in the embodiment of the invention 2 at the position identical with arrow A-A of Fig. 1, is the general profile chart of the expression laser stent central shaft state consistent with the optical head optical axis.
Fig. 7 dissects the general profile chart that obtains to the optical head in the embodiment of the invention 3 at the position identical with arrow A-A of Fig. 1, is the general profile chart of the expression laser stent central shaft state consistent with the optical head optical axis.
Fig. 8 is the stereographic map of the optical head in the embodiment of the invention 4.
Fig. 9 is the skeleton diagram of the optical head of prior art example 1.
Figure 10 is the skeleton diagram of the optical head of prior art example 2.
Figure 11 is the skeleton diagram of the optical head of prior art example 3.
Embodiment
With reference to the accompanying drawings embodiments of the invention are described.
＜embodiment 1 〉
Below with reference to Fig. 1 to Fig. 5 the optical head in the embodiment of the invention 1 is described.
Fig. 1 is the stereographic map of the optical head in the embodiment of the invention 1.Fig. 2 separates the exploded perspective view of representing with the laser stent of the optical head among this explanation embodiment 1 and bracket supporting seat.Fig. 3 is the general profile chart at the observed optical head of arrow A-A of laser stent central shaft state lower edge Fig. 1 consistent with the optical head central shaft.Fig. 4 is the general profile chart at the observed optical head of arrow A-A of the state lower edge of the relative optical head inclined of laser stent central shaft Fig. 1.Fig. 5 is the general profile chart of the observed optical head of arrow A-A of the state lower edge Fig. 1 after the laser stent central shaft moves relative to the optical head inclined and along the Y direction.
Pressing member 41 as component parts in Fig. 2 omits diagram.
In optic pick-up, the laser that penetrates from the laser diode 11 of optical head 1 forms directional light by collimating mirror, is shaped to circular light beam by beam shaping prism, and by behind the optical splitter by object lens optically focused to information recording carrier.Detect by photodetector and read information by the reflected light of information recording carrier reflection.These optical elements optical axis separately is configured to consistent with the optical axis of optic pick-up.Thus, in this optic pick-up, laser with suitable state optically focused to information recording carrier, so can not depart from from the track of information recording carrier the position of optically focused.The result is, can not produce trace error etc., can stably detect information.
Like this, it is consistent with the optical axis of optic pick-up that laser diode 11 is configured to laser beam axis, but there is deviation in the laser beam axis of laser diode 11 because of various products are different.Therefore, in order to adjust laser beam axis, on the optical head 1 of fixed support laser diode 11, be provided for adjusting the structure of luminous point position of shooting angle, the laser diode 11 of laser.Structure to optical head 1 describes below.
In addition, the optical axis of the laser that sends from laser diode 11 there are differences because of product is different, but basic consistent with laser diode central shaft CL, so substantially consistent with the optical axis of optic pick-up.Therefore, the laser beam axis adjustment is to be used to make the optical axis of basically identical further to reach the adjustment operation of optimum condition.
On the bottom 21b of relative two sidewalls of laser stent 21, be equipped with a pair of abutting part 23 across the laser emitting mouth.Each abutting part 23 is that the arc surface of r constitutes by the radius with luminous point EP by laser diode 11 and central shaft C vertical with the optical axis P of optical head 1.Therefore, the luminous point EP of laser diode 11 is positioned at the position (with reference to Fig. 3) of leaving the supporting surface 32 certain distance H1 that contact with two abutting parts 23,23.
In addition, abutting part 23 also can only form a place in the bottom of any sidewall.
On the head 21a relative of laser stent 21 frameworks, be equipped with head 24 accordingly with each abutting part 23 with bottom 21b.Two head 24,24 are that the arc surface of R constitutes by the radius with luminous point EP by laser diode 11 and central shaft C vertical with the optical axis P of optical head 1.Therefore, the luminous point EP of laser diode 11 is positioned at the position (with reference to Fig. 3) of leaving the press surface 43 certain distance H2 that contact with two head 24,24.
In addition, the distance (radius r) from central shaft C to the arc surface that constitutes abutting part 23 forms littler than the distance (radius R) from central shaft C to the arc surface that constitutes head 24.Because the deviation of the radius r of arc surface hour diminishes in radius r,, can reduce the range deviation of arc surface from central shaft C to formation abutting part 23 so the radius of the arc surface by will constituting abutting part 23 is set smallerly.Therefore, in the occasion of carrying out when laser beam axis is adjusted laser diode 11 being tilted, the abutment of abutting part 23 and supporting surface 32 changes, but because the range deviation from central shaft C to the arc surface that constitutes abutting part 23 is little, so 32 distance is almost constant from luminous point EP to supporting surface.
In addition, stent support platform 31 is provided with the press device (34,41) of laser stent 21 being pressed to supporting surface 32.Thus, laser stent 21 is pressed towards stent support platform 31, and the posture of laser stent 21 is maintained.
Particularly, press device is set up in parallel at a pair of guide part 34 of both sides and the pressing member 41 that is arranged on the guiding head 34a by relative laser stent 21 and constitutes (with reference to Fig. 1).Guide part 34 is set up in parallel on stent support platform 31 with laser stent 21 with separating certain intervals.Why this is set is owing to when carrying out the laser beam axis adjustment, will make laser stent 21 along direction (XY direction) displacement vertical with the optical axis P of optical head 1 sometimes at interval.
Guiding head 34a is provided with slot 37 that engages with pressing member 41 and the screw 36 that screws in for the screw 51 that pressing member 41 is fixed on the guide part 34, and pressing member 41 utilizes screw 51 to be fixed on the guiding head 34a.
The press surface 43 of pressing member 41 forms plane, and press surface 43 is with the state press head top 24 (with reference to Fig. 3) vertical with the optical axis P of optical head 1.
Abutting part 23 and head 24 constitute by the arc surface that has by luminous point EP and the central shaft C vertical with the optical axis P of optical head 1, therefore, even laser stent 21 is tilted, laser stent 21 also rotates relative to central shaft C, and abutment that abutting part 23 and supporting surface 32 connect and the distance of central shaft C and head 24 can not change with press surface 43 contacted distances of pushing contact and central shaft C.That is, abutment is certain with the distance of pushing contact, so the power at pressing member 41 press head tops 24 can not change, can push with the state of all-the-time stable and support laser stent 21.
Because supporting surface 32 is vertical planes of optical axis P of relative optical head 1 with press surface 43, and it is parallel to each other, even so laser stent 21 tilts and rotates relative to central shaft C, the direction of pushing of press surface 43 also is always optical axis direction, supports laser stent 21 thereby can push with stable posture.
Pressing member 41 for example is the leaf spring that is made of metals such as iron, copper, aluminium or plastics etc.
The press device that is made of guide part 34 and pressing member 41 also can be set up in parallel guide part 34 and pressing member 41 integrated backs as metal parts and laser stent 21.Like this, form the guide elements that can unload press device, only need the laser stent that can corresponding have various height by changing.
In addition, also can extend to form pressing member 41, pressing member 41, guide part 34 and stent support platform 31 are constituted one from guide part 34.Thus, can reduce the part number.
Below angular setting and position adjustment for the consistent laser stent that carries out 21 of optical axis P that makes laser beam axis and optical head 1 are described.
At first, optical head 1 is adjusted instrument (not shown) by optical head and is kept, and stent support platform 31 is adjusted angle, the position of laser stent 21 relatively.For example, the adjustment arm by optical head adjustment instrument makes laser stent 21 tilt, move.
Particularly, when the optical axis P of the relative optical head 1 of laser beam axis deviation angle θ, make the optical axis P angle of inclination-θ (with reference to Fig. 4) of laser stent 21 relative optical heads 1.Angular setting is to make laser stent 21 tilt to carry out on the supporting surface 32 by being connected to while the abutting part 23 that makes laser stent 21.
Like this, even because of laser beam axis adjustment laser stent 21 tilts, supporting surface 32 also is the plane of the optical axis P approximate vertical of relative optical head 1, because with the abutting part 23 of supporting surface 32 butts is to be made of the arc surface that has by luminous point EP and the central shaft C parallel with supporting surface 32, laser stent 21 rotates relative to central shaft C, does not change (with reference to Fig. 4) so go up at optical axis direction (Z direction) position of luminous point EP.
In addition, depart from installation position owing to laser diode chip, and during the optical axis P deviation angle θ of luminous point EP relative assigned position deviation distance y and the relative optical head 1 of laser beam axis, make laser stent 21 displacement-y on the vertical direction of the optical axis P of optical head 1 relatively on one side, on one side the optical axis P angle of inclination-θ of optical head 1 relatively.Angular setting and position adjustment are by carrying out while abutting part 23 being connected to laser stent 21 is moved.
Like this, move even the abutting part 23 of laser stent 21 is parallel with supporting surface 32 butt ground, supporting surface 32 also is the plane of the optical axis P approximate vertical of relative optical head 1, does not change (with reference to Fig. 5) so go up at optical axis direction (Z direction) position of luminous point EP.
Thus, because the position on the optical axis direction (being the range direction of luminous point and collimating mirror) of optical head 1 does not change, so the luminous point of laser diode 11 and the distance of collimating mirror do not change, focal length does not change yet, thereby by carrying out the optical axis adjustment, the depth of parallelism that becomes the laser of directional light via collimating mirror does not change, and therefore, laser spot is dwindled shine the shape of the luminous point on the information recording carrier less than changing.That is, when carrying out the laser beam axis adjustment, need not consider that the depth of parallelism that becomes the laser of directional light via collimating mirror changes, so can easily carry out the laser beam axis adjustment.
In addition, also can carry out the angular setting and the position adjustment of laser stent 21 simultaneously.Promptly, in the prior art, because when changing the angle of laser stent 21, the position of luminous point EP can change on optical axis direction, so all need carry out the position adjustment of luminous point when each angle changes, but in the present invention, owing to need not carry out the position correction that this angular setting causes, so even carry out angular setting simultaneously and the position adjustment also can all be adjusted to optimum condition with angle and position.In addition, can carry out simultaneously, can corresponding shortening adjust the time.
Do not push laser stent 21 owing to do not utilize pressing member from the direction (XY direction) beyond the optical axis direction of optical head 1, so laser stent 21 can move freely on the direction (XY direction) perpendicular to the optical axis P of optical head 1, can be easily on direction (XY direction), adjust perpendicular to the optical axis P of optical head 1.Promptly, owing to connecting elements such as not utilizing screw is fixed on laser stent 21 on stent support platform 31 grades, so when carrying out the adjustment of angular setting or position, do not need to unclamp the laggard line position adjustment of connecting elements such as screw temporarily and then connecting elements such as screw are screwed on, can shorten and adjust the activity duration.
After optical axis is adjusted, destroy, optical head 1 is unloaded the back from optical head adjustment instrument utilize bonding agent to fix laser stent 21 in order to prevent adjusted state.
Even optical head 1 is unloaded from optical head adjustment instrument, laser stent 21 is also pushed by press device and is supported on the stent support platform 31, is remaining the posture of laser stent 21, so also can easily carry out the adjusted operation of optical axis.That is,, then need to utilize in advance temporary fixed adjusted states such as anchor clamps, but that the present invention does not need to carry out is this temporary fixed if adopt the structure to keep laser stent 21 postures.
＜embodiment 2 〉
Below with reference to Fig. 6 the optical head in the embodiment of the invention 2 is described.
Fig. 6 dissects the general profile chart that obtains to the optical head in the embodiment of the invention 2 at the position identical with arrow A-A of Fig. 1, is the general profile chart of the expression laser stent central shaft state consistent with the optical head optical axis.
The formation of present embodiment and embodiment 1 is basic identical.That is, optical head 1 comprises: laser diode 11, the laser stent 21 that keeps laser diode 11 and butt support the stent support platform 31 of laser stent 21, only are below this point to be described the structure of abutting part 23 with the difference of embodiment 1.
The abutting part 23 that is arranged on the laser stent 21 is equipped with a pair of abutting part 23 across the laser emitting mouth in the same manner with embodiment 1 on the bottom 21b of laser stent 21 frameworks.Two abutting parts 23,23 are that the arc surface of r constitutes by the radius with luminous point EP by laser diode 11 and central shaft C vertical with the optical axis P of optical head 1.Therefore, the luminous point EP of laser diode 11 is positioned at the position of leaving supporting surface 32 certain distances that contact with two abutting parts 23,23.
On each abutting part 23, be formed with arc surface continuously with the external conical surface 27,27 of predetermined angular.That is,, can reduce the gap of laser stent 21 and stent support platform 31 on laser stent 21 by this abutting part 23 is set.Thus, the heat that laser diode 11 produces conducts to stent support platform 31 by laser stent 21, so can improve the thermal diffusivity of optical head 1.
In addition, also can use the high material of temperature conductivitys such as iron, copper to constitute the pressing member 41 of stent support platform 31, thereby can improve the thermal diffusivity of optical head 1.
Moreover, also can strengthen the head 24 of stent support platform 31 and the butt area of pressing member 41, thereby improve the thermal diffusivity of optical head 1.That is, the radius that constitutes the arc surface of head 24 can be strengthened, thereby the butt area of head 24 and pressing member 41 strengthens, thermal diffusivity improves.
Thus, can prolong the life-span of laser diode 11.
＜embodiment 3 〉
Below with reference to Fig. 7 the optical head in the embodiment of the invention 3 is described.
Fig. 7 dissects the general profile chart that obtains to the optical head in the embodiment of the invention 3 at the position identical with arrow A-A of Fig. 1, is the general profile chart of the expression laser stent central shaft state consistent with the optical head optical axis.
The optical head 1 of present embodiment comprises: laser diode 11, the laser stent 21 that keeps laser diode 11 and butt support the stent support platform 31 of laser stent 21.Each component parts is that optical axis P with optical head 1 is a baseline configuration.
On the bottom 21b of laser stent 21 frameworks, be equipped with a pair of abutting part 23 across the laser emitting mouth.Each abutting part 23 is the projections with the crest line portion 25 that two planes 29,29 is intersected and form, and two crest line portions 25,25 and the luminous point EP that passes through laser diode 11 and the straight line vertical with the optical axis P of optical head 1 are consistent.Therefore, the luminous point EP of laser diode 11 and two crest line portions 25,25 on same straight line, and with the supporting surface 32 that is connected to crest line portion 25 at grade.
On the head 21a relative of laser stent 21 frameworks, be equipped with head 24 accordingly with each abutting part 23,23 with bottom 21b.Two head 24,24 are made of the arc surface that has by the luminous point EP of laser diode 11 and the central shaft C vertical with the optical axis P of optical head 1 (promptly passing through the straight line of crest line portion 25).Therefore, the luminous point EP of laser diode 11 is positioned at the position of leaving the press surface 43 certain distance H3 that contact with two head 24,24.
Adopt this formation, can easily carry out the angular setting and the position adjustment of optical head 1.Promptly, crest line portion 25 consistent with the straight line by luminous point EP and with supporting surface 32 butts, even tilt because of the laser beam axis adjustment makes laser stent 21, laser stent 21 also rotates relative to crest line portion 25, thereby the position of luminous point EP can not change on the optical axis direction of optical head 1.In addition, because supporting surface 32 is the planes with the optical axis approximate vertical of optical head 1, so even the crest line portion of laser stent 21 25 moves with supporting surface 32 butt ground, the position of luminous point EP can not change on optical axis direction yet.
Thus, can carry out the angular setting of laser radiation angle and the luminous point position adjustment of laser diode 11 simultaneously.
In addition, stent support platform 31 is provided with the press device of laser stent 21 being pressed to supporting surface 32.Thus, laser stent 21 is pressed towards stent support platform 31, and the posture of laser stent 21 is maintained.
Concrete press device is identical with the structure shown in the embodiment 1, its explanation of Therefore, omited.
In addition, the angular setting of laser stent 21 and position are adjusted identical with embodiment 1, its explanation of Therefore, omited.
＜embodiment 4 〉
Below with reference to Fig. 8 the optical head in the embodiment of the invention 4 is described.
Fig. 8 is the stereographic map of the optical head in the embodiment of the invention 4.
In the present embodiment, above-mentioned stent support platform 31 forms as one with the shell 61 of optic pick-up.
The optical head 1 of present embodiment comprises: laser diode 11, keep the laser stent 21 of laser diode 11 and support the integrally formed shell 61 of stent support platform 31 of laser stent 21 with butt.Thus, optical head 1 directly is installed on the shell 61 of optic pick-up, does not need to be provided as separately the part of stent support platform 31, thereby can reduce cost of products.
Adopt this formation, can obtain the effect identical with embodiment 1.That is, even tilt because of the laser beam axis adjustment makes laser stent 21, laser stent 21 is also relative to rotating by luminous point EP and the central shaft C vertical with the optical axis P of optical head 1, thereby the position of luminous point EP can not change on optical axis direction.In addition, even go up the position of the position of adjustment laser stent 21 with adjustment lasing fluorescence point EP in the direction vertical with the optical axis P of optical head 1 (XY direction), the position of luminous point EP can not change on optical axis direction (Z direction) yet.In addition, even owing to carry out angular setting or position adjustment, the position of luminous point EP on optical axis direction can not change yet, and therefore, can carry out angular setting and position adjustment simultaneously.
In addition, shell 61 is provided with the press device of laser stent 21 being pressed to supporting surface 32.Thus, laser stent 21 is pressed towards supporting surface 32, and the posture of laser stent 21 is maintained.
Concrete press device is identical with the structure shown in the embodiment 1, its explanation of Therefore, omited.
Method of adjustment to optical head 1 describes below.
When before optical element being installed on the shell 61, the optical axis P of optical head 1 being adjusted, identical with embodiment 1, utilize optical head adjustment instrument to keep optical head 1, angle, the position of laser stent 21 are adjusted.
When after optical element being installed on the shell 61, the optical axis P of optical head 1 being adjusted, owing to play a role as optic pick-up, so while can directly measure the optical axis that optical head 1 is adjusted in the output of photodetector.At this moment, the optical axis deviation in the time of can eliminating optical head 1 installing is so can carry out the optical axis adjustment better.
＜embodiment 5 〉
Below the optic pick-up in the embodiment of the invention 5 (not shown) is described.
Optic pick-up comprises: the optical head 1 of explanation among the embodiment 1 to 4, make the laser that penetrates from laser diode 11 become directional light collimating mirror, will become the conglobate shaping prism of laser shaping of directional light, detecting device that the object lens that shine after laser spot after the shaping is dwindled and receiving detect by the light of information recording carrier reflection and to this light signal etc.
Adopt this formation, even because of the laser beam axis adjustment of laser diode 11 is tilted laser stent 21, also because not variation of the position on the optical axis direction (being the range direction of luminous point and collimating mirror) of optical head 1, so the luminous point of laser diode 11 and the distance of collimating mirror do not change, focal length does not change yet.That is, by carrying out the optical axis adjustment, the depth of parallelism that becomes the laser of directional light via collimating mirror does not change, therefore, laser spot is dwindled shine the shape of the luminous point on the information recording carrier also not change, thus, so can easily carry out the optical axis adjustment of optic pick-up.Therefore, can improve the throughput rate of optic pick-up.
The present invention can implement with other various forms in the scope that does not break away from its spirit or principal character.Therefore, the various aspects of the foregoing description all only are illustrations, can not do limited interpretation.Protection scope of the present invention is narrated by claims, is not subjected to any restriction of this instructions.Moreover, belong to claims equivalency range in distortion or the change also all within the scope of the present invention.
Claims (15)
1, a kind of optical head, comprise the stent support platform that keeps laser diodes device support and keep this laser stent, be used for to shine from described laser diodes and carry out recording of information/regeneration on the information recording carrier, it is characterized in that
Described laser stent is the framework of fixing described laser diode, has the abutting part that is darted at this framework bottom,
Described stent support platform has the through hole that butt supports the supporting surface of described abutting part and described laser is passed through,
Described supporting surface is and the plane of the optical axis approximate vertical of described optical head, and described abutting part is the arc surface with following central shaft, the luminous point of this central shaft by described laser diode and vertical with described optical axis.
2, optical head as claimed in claim 1 is characterized in that, described abutting part forms a pair of on two relative positions of described framework.
3, optical head as claimed in claim 1 or 2, it is characterized in that, described laser stent has the head corresponding with described abutting part on the head relative with described bottom, described stent support platform has press device from described head to the direction that makes described abutting part push described supporting surface that push.
4, optical head as claimed in claim 3 is characterized in that, described head is the projection that is made of the arc surface with described central shaft,
Described press device constitutes and utilizes the pressing member with plane press surface vertical with described optical axis to push described head.
5, optical head as claimed in claim 4 is characterized in that, the distance of the arc surface from described central shaft to described abutting part is littler than the distance of the arc surface from described central shaft to described head.
As each described optical head in the claim 1,2,4,5, it is characterized in that 6, described abutting part has the conical surface external continuously with arc surface.
7, optical head as claimed in claim 3 is characterized in that, described abutting part has the conical surface external continuously with arc surface.
8, a kind of optical head, comprise the stent support platform that keeps laser diodes device support and keep this laser stent, be used for to shine from described laser diodes and carry out recording of information/regeneration on the information recording carrier, it is characterized in that
Described laser stent is the framework of fixing described laser diode, in the bottom of this framework the abutting part of being equipped with the crest line portion that is formed by two crossing on the same levels is set,
Described stent support platform has the through hole that butt supports the supporting surface of described abutting part and described laser is passed through,
Described supporting surface is the plane with the optical axis approximate vertical of described optical head, described crest line portion and luminous point by described laser diode and consistent perpendicular to the straight line of described optical axis.
9, optical head as claimed in claim 8 is characterized in that, described abutting part forms a pair of on two relative positions of described framework.
10, optical head as claimed in claim 8 or 9, it is characterized in that, described laser stent has the head corresponding with described abutting part on the head relative with described bottom, this head is the projection that is made of the arc surface that is central shaft with described crest line portion
Described stent support platform has and utilizes the pressing member comprise the plane press surface vertical with described optical axis to push the device of described head.
As each described optical head in the claim 1,2,4,5,7,8,9, it is characterized in that 11, the shell of described stent support platform and optic pick-up forms as one.
12, optical head as claimed in claim 3 is characterized in that, the shell of described stent support platform and optic pick-up forms as one.
13, optical head as claimed in claim 6 is characterized in that, the shell of described stent support platform and optic pick-up forms as one.
14, optical head as claimed in claim 10 is characterized in that, the shell of described stent support platform and optic pick-up forms as one.
15, a kind of optic pick-up is used for the laser radiation from optical head is carried out recording of information/regeneration to information recording carrier, it is characterized in that, described optical head is each described optical head in the claim 1 to 14.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005192412 | 2005-06-30 | ||
| JP2005192412A JP3999240B2 (en) | 2005-06-30 | 2005-06-30 | Optical head and optical pickup device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1892849A CN1892849A (en) | 2007-01-10 |
| CN100437781C true CN100437781C (en) | 2008-11-26 |
Family
ID=37597616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101007253A Expired - Fee Related CN100437781C (en) | 2005-06-30 | 2006-06-29 | Optical head and optical pickup device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3999240B2 (en) |
| CN (1) | CN100437781C (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02294949A (en) * | 1989-05-10 | 1990-12-05 | Seiko Epson Corp | Optical pickup |
| JPH0581693A (en) * | 1991-09-25 | 1993-04-02 | Fuji Electric Co Ltd | Optical head |
| JP2835778B2 (en) * | 1990-09-28 | 1998-12-14 | 富士通株式会社 | Optical head and its adjustment method |
| CN1250212A (en) * | 1998-10-02 | 2000-04-12 | 三星电子株式会社 | Optical pick device for controlling light beam deflection and beam angle in disc driving device |
| CN1441418A (en) * | 2002-02-25 | 2003-09-10 | 株式会社日立制作所 | Optical head and its regulating method and optical disc device using such optical head and method |
| CN1577537A (en) * | 2003-05-15 | 2005-02-09 | 夏普株式会社 | Optical pickup apparatus |
-
2005
- 2005-06-30 JP JP2005192412A patent/JP3999240B2/en active Active
-
2006
- 2006-06-29 CN CNB2006101007253A patent/CN100437781C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02294949A (en) * | 1989-05-10 | 1990-12-05 | Seiko Epson Corp | Optical pickup |
| JP2835778B2 (en) * | 1990-09-28 | 1998-12-14 | 富士通株式会社 | Optical head and its adjustment method |
| JPH0581693A (en) * | 1991-09-25 | 1993-04-02 | Fuji Electric Co Ltd | Optical head |
| CN1250212A (en) * | 1998-10-02 | 2000-04-12 | 三星电子株式会社 | Optical pick device for controlling light beam deflection and beam angle in disc driving device |
| CN1441418A (en) * | 2002-02-25 | 2003-09-10 | 株式会社日立制作所 | Optical head and its regulating method and optical disc device using such optical head and method |
| CN1577537A (en) * | 2003-05-15 | 2005-02-09 | 夏普株式会社 | Optical pickup apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007012184A (en) | 2007-01-18 |
| JP3999240B2 (en) | 2007-10-31 |
| CN1892849A (en) | 2007-01-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1127725C (en) | Optical read-out device and CD player | |
| CN100437781C (en) | Optical head and optical pickup device | |
| JP2001084685A (en) | Tilt adjusting device of disk drive | |
| US8102752B2 (en) | Optical head and optical pickup device with a holder structure providing optical axis adjustment | |
| CN1195416A (en) | Optical pickup | |
| CN1074533C (en) | Apparatus for measuring degree of inclination of objective lens for optical pickup | |
| US6785063B2 (en) | Objective lens holding apparatus | |
| CN1251210C (en) | Optical pickup apparatus, holder and method of producing optical pickup apparatus | |
| TW200302463A (en) | Lens holder having for optical pickup device | |
| JP4770715B2 (en) | Optical pickup device | |
| JPH01162235A (en) | Optical head | |
| EP0735528B1 (en) | Pickup device for optical disk | |
| CN1969329A (en) | Apparatus and method for generating a scanning beam in an optical pickup head, miniature optical pickup head and optical storage system incorporating a miniature pickup head | |
| JP2003016659A (en) | Optical pickup device | |
| US6798819B1 (en) | Optical pickup apparatus and method of manufacturing the same | |
| CN100334623C (en) | Optical head, optical-information medium driving device, and sensor | |
| KR100649844B1 (en) | Laser diode holder structures of optical pick-up apparatus | |
| KR100680167B1 (en) | An optical unit and optical pick-up apparatus | |
| CN100380468C (en) | Optical recording disk device and manufacturing method therefor | |
| US6912721B2 (en) | Optical read and write apparatus | |
| JP2003217134A (en) | Optical pickup device | |
| JP3548694B2 (en) | Optical pickup device and method of manufacturing the same | |
| CN1784723A (en) | Optical head and optical information medium driver | |
| KR20040070890A (en) | Tilting apparatus of laser diode of optical pickup device | |
| JP2008269701A (en) | Optical pickup device, method for assembling the same, and assembling unit for the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081126 Termination date: 20160629 |