CN1922666A - Pickup unit comprising a stroke limiter, and disk drive unit provided with such a pickup unit - Google Patents
Pickup unit comprising a stroke limiter, and disk drive unit provided with such a pickup unit Download PDFInfo
- Publication number
- CN1922666A CN1922666A CNA2005800058961A CN200580005896A CN1922666A CN 1922666 A CN1922666 A CN 1922666A CN A2005800058961 A CNA2005800058961 A CN A2005800058961A CN 200580005896 A CN200580005896 A CN 200580005896A CN 1922666 A CN1922666 A CN 1922666A
- Authority
- CN
- China
- Prior art keywords
- read
- write equipment
- movable part
- support member
- elastic support
- 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.)
- Pending
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0933—Details of stationary parts
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/121—Protecting the head, e.g. against dust or impact with the record carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0932—Details of sprung supports
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
A pickup unit (1) for reading and/or writing data on a disk comprises a lens holder (3) which is connected to a base (4) of the pickup unit (1) by means of at least one elastic support member (5). The lens holder (3) is movable with respect to the base (4) by bending of the at least one elastic support member (5) under the action of an actuator (6, 7, 8) acting between the lens holder and the base. A stroke limiter (11) is provided between the base and the lens holder to limit the stroke of the lens holder relative to the base. The stroke limiter (11) is of an electro-mechanical type including, besides an electrical contact, a mechanical stop. The electrical contact (5, 12, 13; 15, 12, 14) is operatively connected to the actuator (6, 7, 8) to cause the actuator to move the lens holder towards a central position upon closure of the contact.
Description
Technical field
The present invention relates to a kind of reading on CD and/or the read-write equipment of write data, it comprises an overstroke safety device, to limit the stroke of any motion of movable part in this read-write equipment.
Background technology
One of problem of this class read-write equipment is that the stroke of movable part is so big in the read-write equipment, so that this movable part may run into part or CD near the movable part, and this may the damage dish or the optics or the mechanical organ of read-write equipment.
Known read-write equipment embodiment attempts to address this problem among the EP1124223A.
Movable part is positioned on the base in the read-write equipment that EP1124223A provides, and makes movable part be limited by two on the base upstanding walls that surround movable part at the stroke of any motion on the tracking direction.This movable part is limited by limit element at the range of movement of focus direction.Therefore, this read-write equipment provides the mechanical system of restriction stroke.
Also have some other read-write equipments, they attempt to solve the excessive problem of movable part stroke, method is to utilize read-write equipment light path and circuit signal that excessive stroke detection is come out and provide signal to actuating mechanism, makes it return the center to apply resistibility on movable part.
An object of the present invention is to provide read-write equipment with novel overstroke safety device.
Summary of the invention
For reaching this purpose, read-write equipment of the present invention comprises feature as claimed in claim 1.
In pressing the read-write equipment of claim 1, overstroke safety device comprises an electric contact, and it links to each other with actuating mechanism effectively, and when the closing of contact, actuating mechanism makes the movable part motion or allows it move towards the center.The advantage of this system is that the trip limiter can make the read-write equipment quick acting, because movable part activated mechanism or at least one elastic support member brings back to its normal range rapidly.Therefore, the running of read-write equipment links up rapidly, thereby prevents any interference of optical disc apparatus operation.But, by the optical system of system of the present invention and optical disc apparatus or the existence of the CD that matches of optical system is irrelevant therewith.
Though the present invention can be used to the motion of restraint parts in a direction, preferably adopt the embodiment of claim 2, because the risk minimum that it damages read-write equipment and CD.
Preferred embodiment according to pick up apparatus of the present invention limits in claim 3.
According to this embodiment, mechanical and electric spacing being joined together, both mechanical position limitation also can be by the range of operation that brings back to it but make the movable part of read-write equipment.Preferably linked together to simplify the overstroke safety device structure mechanical position limitation and electrical contact.
Simple embodiment by overstroke safety device of the present invention is defined by claim 4, though preferably it is combined with the feature of claim 5, electric like this and Mechanical Contact is all realized by the opposition element.
If the feature of claim 6 is used in this read-write equipment, overstroke safety device with scalable accurately to be regulated by specific read-write equipment.In this way can tolerance balancing.
Utilize the characteristic of claim 8 very favourable in this embodiment because elastic support member in many read-write equipments always the conduction.
Overstroke safety device of the present invention need not done a lot of modifications and just can be incorporated in the existing read-write equipment.In new design, preferably utilize the characteristic of claim 12, because this will take the contact to more approach the read-write equipment movable part barycenter.So more help absorbability when overstroke safety device moves.This will improve the degree of accuracy of overstroke safety device.Embodiment to claim 13 also is like this.
The invention still further relates to the optical disc apparatus that comprises above-mentioned read-write equipment.
These and other aspect of the present invention and advantage will be from below in conjunction with recognizing the description of the drawings.
Description of drawings
Fig. 1 is the simplified perspective view of a kind of preferred embodiment of optical disc apparatus read-write equipment of the present invention.
Fig. 2 is the skeleton view of Fig. 1 read-write equipment of seeing from another side.
Fig. 3 is the enlarged drawing of details III among Fig. 1.
Fig. 4 is the view suitable with Fig. 3, but another embodiment of expression read-write equipment of the present invention.
Fig. 5 be comprise read-write equipment of the present invention optical disc apparatus than the small scale sketch.
Fig. 6 represents the very schematically circuit of the read-write equipment of a kind of Fig. 1 of being used for-5, and it can make the movable part of this read-write equipment turn back to the center.
Embodiment
Accompanying drawing is represented the preferred embodiment of read-write equipment 1 of the present invention.This read-write equipment can be used for data are read and/or write on the device on the dish, and as Disc player, it utilizes light, magnetic etc. to read and/or writing component is read sound, image and/or data and/or write on the CD.
Fig. 5 represents such optical disc apparatus, and it comprises motor 20 and main shaft 21 and optical system 22, and the latter comprises read-write equipment 1, is used for reading or to its write data from dish D.In Fig. 5, dish D is contained among the optional tray salver C who is inserted in this drive unit.Dish D has a clamping district of being meshed by the main shaft 21 of motor 20 to be driven.The dish D that the lens position of read-write equipment 1 is very approaching when inserting.
Be used in (light) dish in this optical disc apparatus coding in one or more layers of data in dish.Known various principle, every kind of distortion is suitable for using in conjunction with the present invention.Data are put in one or several magnetic track with digital form row.Change along data track (light) characteristic comprises the data that are recorded on the dish.In order on dish, to read and/or write data, utilize the optical disc apparatus motor to make disc spins.Read and/or write dish by the read-write equipment detection along the change of data track (light) characteristic.In the present invention now in this preferred embodiment, be to utilize from read-write equipment emission and the laser that reflects back to detect this variation.
With reference to figure 1-4, the preferred embodiment of read-write equipment 1 comprises lens (will be installed in the hole 2), and its conduct is read and/or writing component is installed on the movable part, is on the lens carrier 3 in this example.Four straight steel wire elements 5 of these lens carrier 3 usefulness link to each other with the base 4 of read-write equipment 1, these elements by elasticity and preferably the conduction material make, as copper, iron, or alloy.Steel wire element 5 forms elastic support member like this, when not having external force to act on the lens carrier 3, it is suspended on stable (before a biasing) position, and can allow it move a little with respect to base 4 on being added to lens carrier 3 effectively the time.
Read-write equipment 1 is made the as a whole slide mechanism (not shown) that passes through and is moved at tracking direction y with respect to dish.The actuating mechanism 6,7,8 (see Fig. 4, be omitted in Fig. 1-3) that is provided between lens carrier 3 and the base 4 can allow the lens 2 of read-write equipment 1 move at tracking direction y and focus direction z with respect to dish and base 4, and it is tilted around circumferential axis x.
In the preferred embodiment of read-write equipment 1, actuating mechanism 6,7,8 comprise the permanent magnet 9 and the coil 10 that links to each other with lens carrier 3 (being positioned at the opposite of relevant permanent magnet 9) that some link to each other with base 4, lead to electric current then coil 10 and 9 pairs of lens carrier 3 application of forces of permanent magnet in coil 10.Lens carrier 3 is used to laser focusing to the accurate point of the interior data track of dish with respect to the motion of base 4 and dish, allow lens carrier 3 with respect to the dish location simultaneously, make laser always be locally perpendicular to card, no matter and card whether owing to the deviation of its flatness tilts.
Be the position and the orientation of lens carrier 3 in accurate this read-write equipment of control 1 preferred embodiment, the electric current by coil 10 is provided by the control circuit (not shown).In order to determine the physical location of lens carrier 3 with respect to dish, control circuit can utilize the laser intensity parameter that for example received by read-write equipment 1 etc.This control assembly is not a part of the present invention, and known a lot of possible control circuit schemes is arranged for this purpose, therefore no longer it is described further here.
The lens carrier 3 of band lens 2 is adapted to be mounted within very close to one of card very little operating distance (being typically 0.15 to 1mm) to be located, and very close to permanent magnet 9.Motion significantly or vibration unexpected in the reading device may cause lens carrier 3 bump CD or magnets, and this may cause the damage of lens carrier 3, lens 2 and/or dish.
According to the present invention, an overstroke safety device 11 is provided, comprise overstroke safety device plate 12 in the case, it is being fixed on the base 4 near lens carrier 3 places.This restrictor plate is basically perpendicular to steel wire supporting element 5 extends, and extend in the hole 13 that the latter passes in the restrictor plate 12.The dimension/diameter in these holes 13 is hanked, and around steel wire element 5 free space to be arranged be the gap, and its decision steel wire element 5 is at the freedom of motion (also visible Fig. 3) of restrictor plate 12 positions.This has determined the free travel of lens carrier 3 in all directions.The size in hole 13 should be hanked and be made lens carrier can not run into magnet 10, also is restricted in focus direction simultaneously, runs into the risk of dish with eliminating or reduction.Restrictor plate 12 or certain other overstroke safety device element can be regulated, with the tolerance between offset lens support 3 and the base 4.Hole 13 can be square, rectangle, and circular or other Any shape is as long as can limit the stroke of lens carrier in required direction on request.These holes can be fully or only part surround steel wire element.In fact in the embodiment shown, restrictor plate 12 each corner can be removed and form recess or groove, make hole 13 have only the two sides adjacent with corresponding steel wire element 5.The motion of corresponding steel wire element 5 is limited at different directions in each hole, makes each hole 13 complimentary to one another and limit the motion of lens carrier 3 in all directions jointly.
Fig. 6 is a simple circuit, is used for guaranteeing that lens carrier 3 will return its center when the closing of contact.Comprise coil 10 ' and 10 in the circuit ", be used for driving lens carrier 3 in focus direction and tracking direction.Corresponding lead-in wire 23 ' and 23 " by steel wire element 5 and through respective amplifier 24 ' and 24 " be connected to the processor parts.Restrictor plate 12 is as earthing contact, and at least one steel wire element 5 is used as short circuiting switch 25 when contact restrictor plate 12 simultaneously.Under the sort of situation, coil 10 ', 10 " on electromotive force be eliminated, make to no longer include any acting force on the lens carrier 3.Thereby lens carrier 3 will return its center under the elastic force effect that steel wire element 5 is applied thereto.As addition thereto, can become to add an active control signal afterwards to coil 10 ', 10 software programming of processor parts in short circuit (it can partly be detected by processor) " on, lens carrier 3 is shifted onto its center.
This layout not only provides the mechanical protection to this device, but also electric protection is provided.If software fault causes lens carrier 3 to be shifted onto extreme position by the continuous fault signal, then eliminate coil 10 ', 10 " electromotive force will prevent that them from being burnt out and can be used to and make this software rejuvenation.
Fig. 4 represents another embodiment, wherein restrictor plate 11 comprise with lens carrier 3 on another holes 14 of pin 15 collaborative works of stretching out.The pin of these collaborative works and hole at least at both direction as overstroke safety device, and banking motion is by the collaborative work restriction in 13 in steel wire element 5 and hole.The barycenter of the preferably basic scioptics support 3 of pin 15, when being limited 12 restrictions of device plate with the motion of convenient lens carrier, the moment of inertia on the restriction lens carrier.The most desirable is that effective abutment of overstroke safety device is just at the barycenter of lens carrier.
According to the above deducibility, read-write equipment 1 of the present invention provides a kind of simple effectively overstroke safety device for the optical disc apparatus read-write equipment.
The invention is not restricted to the described embodiment of top accompanying drawing, it can not deviate from scope of the present invention from several respects change.
For example, elastic support member can be the shape of any kind between its installation site, and wherein each can have different bending stiffnesses, as long as the center of rigidity of steel wire element overlaps with the barycenter of lens carrier.The quantity of elastic support member also is not limited to 4; For example, read-write equipment can be provided with 6 elastic support member, and it is right to be arranged to two collaborative supporting element groups rather than two collaborative supporting elements.
As another example, on the same direction in any direction of the installation site of every pair of collaborative elastic support member on lens carrier and the base, can separate equidistance, to obtain (dynamically) characteristic of aforesaid lens carrier motion.
In another modification, elastic support member can become a low-angle to the plane of scioptics on focus direction and tangential direction.
Must be pointed out that using " one " or " a kind of " not repel has a plurality of these items, " comprises " speech simultaneously and does not get rid of extra element or step in this explanation and claims.Reference symbol in claims can not be thought the restriction to its scope.Single processor or parts can be finished the function of several elements in claims.
In present preferred embodiment, dish is an optical data disk.But should point out that the present invention also can be used for the dish of all other types, as ferroelectric, magnetic, magneto-optic, near field, active Charge Storage dish, or utilize the combination of these technology or other read and/other dish of writing technology.In these cases, lens will be replaced by certain other read/write element.
The invention is not restricted to the described embodiment of top accompanying drawing, and can change differently within the scope of the appended claims.For example, overstroke safety device can comprise a base-mounted projection and the opposition element that is installed on the lens carrier.In each embodiment, the part of overstroke safety device can be conduct electricity fully or comprise contact and conductor, excite required signal or electric current during with the closing of contact in overstroke safety device.
If elastic support member is fixed on the bossing of movable part, their more available extensions reach outside the bossing.These extensions can be cooperated mutually with the opposition element, and thereby play overstroke safety device, its position is more near the barycenter of read-write equipment movable part.
Claims (16)
1. on CD, read and/or the read-write equipment (1) of write data for one kind, comprise a movable part (3), it is connected on the base (4) of read-write equipment (1) with at least one elastic support member (5), this movable part (3) can be by acting on the actuating mechanism (6 between movable part and base, 7,8) down crooked this at least one elastic support member (5) of effect, and with respect to base (4) the focus direction (z) of movable part go up towards or deviate from the dish motion, this read-write equipment also comprises an overstroke safety device (11) that is between base and the movable part, in order on focus direction, to limit the stroke of movable part at least with respect to base, the trip limiter comprises and actuating mechanism (6,7,8) electric contact (5,12,13 that links to each other effectively; 15,12,14), make actuating mechanism when the closing of contact, can allow movable part move towards the center.
2. read-write equipment as claimed in claim 1, wherein overstroke safety device (11) is constructed to the nearly all stroke that may move of restraint parts (3).
3. read-write equipment as claimed in claim 1 or 2, wherein overstroke safety device (11) is the electromechanical type, comprises a mechanical stop except that electric contact.
4. read-write equipment as claimed in claim 3, wherein mechanical stop comprises at least one protrusion element (5; 15) and the opposition element (12), the latter has hole (13; 14), this hole to small part band gap ground surrounds this and protrudes element, and the stroke of movable part is defined in this gap.
5. read-write equipment as claimed in claim 4 wherein protrudes element (5; 15) and the opposition element (12) conduct electricity, to form this electric contact.
6. as claim 4 or 5 described read-write equipments, wherein protrude element (5; 15) and in the opposition element (12) at least one is adjustable.
7. as arbitrary described read-write equipment in the claim 4 to 6, the elastic support member of wherein protruding element (5) and being by the hole of passing contiguous movable part (3) forms.
8. read-write equipment as claimed in claim 7, wherein at least one elastic support member (5) is made of conductive material, and is used as the part of overstroke safety device (11) electric contact.
9. as arbitrary described read-write equipment in the above-mentioned claim, comprise a plurality of elastic support member (5), preferably 4 elastic support member.
10. read-write equipment as claimed in claim 9, wherein elastic support member (5) is a steel wire element.
11. as arbitrary described read-write equipment in the claim 4 to 10, the element (12) that wherein opposes is a panel element, it be installed in that base (4) is gone up and with protrude element (5; 15) cooperation.
12. as arbitrary described read-write equipment in the claim 9 to 11, wherein elastic support member (5) is fixed on the extension of movable part (3), and reaches beyond this extension by corresponding extension, this extension is cooperated with the opposition element.
13. as arbitrary described read-write equipment in the above-mentioned claim, wherein protruding element (15) is the element that separates with at least one supporting element (5), and preferred orientation becomes basic along the direction stretching, extension by movable part (3) barycenter.
14. as arbitrary described read-write equipment in the above-mentioned claim, wherein electric contact (5,12,13; 15,12,14) as earthing contact, so that actuating mechanism (6,7,8) stops to activate and allowing at least one elastic support member (5) to make movable part (3) turn back to the center.
15. as arbitrary described read-write equipment in the above-mentioned claim, wherein electric contact (5,12,13; 15,12,14) become like this with the processor unit architecture, make when the closing of contact, actuating mechanism (6,7,8) allows movable part (3) move to core from processor parts received signal.
16. optical disc apparatus that comprises arbitrary described read-write equipment in the aforesaid right requirement.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP04100768.3 | 2004-02-26 | ||
| EP04100768 | 2004-02-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1922666A true CN1922666A (en) | 2007-02-28 |
Family
ID=34917198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800058961A Pending CN1922666A (en) | 2004-02-26 | 2005-02-18 | Pickup unit comprising a stroke limiter, and disk drive unit provided with such a pickup unit |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1721315A1 (en) |
| JP (1) | JP2007525782A (en) |
| KR (1) | KR20060126787A (en) |
| CN (1) | CN1922666A (en) |
| TW (1) | TW200539128A (en) |
| WO (1) | WO2005086146A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2641815B2 (en) * | 1991-07-22 | 1997-08-20 | シャープ株式会社 | Objective lens drive |
| JP3888821B2 (en) * | 2000-02-09 | 2007-03-07 | パイオニア株式会社 | Pickup device and manufacturing method thereof |
-
2005
- 2005-02-18 CN CNA2005800058961A patent/CN1922666A/en active Pending
- 2005-02-18 KR KR1020067016907A patent/KR20060126787A/en not_active Application Discontinuation
- 2005-02-18 WO PCT/IB2005/050613 patent/WO2005086146A1/en not_active Application Discontinuation
- 2005-02-18 EP EP05708802A patent/EP1721315A1/en not_active Withdrawn
- 2005-02-18 JP JP2007500336A patent/JP2007525782A/en active Pending
- 2005-02-23 TW TW094105477A patent/TW200539128A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| TW200539128A (en) | 2005-12-01 |
| WO2005086146A1 (en) | 2005-09-15 |
| KR20060126787A (en) | 2006-12-08 |
| EP1721315A1 (en) | 2006-11-15 |
| JP2007525782A (en) | 2007-09-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |