CN100343912C - Structure for preventing gear slippage in optical disk drive - Google Patents
Structure for preventing gear slippage in optical disk drive Download PDFInfo
- Publication number
- CN100343912C CN100343912C CNB2005100037628A CN200510003762A CN100343912C CN 100343912 C CN100343912 C CN 100343912C CN B2005100037628 A CNB2005100037628 A CN B2005100037628A CN 200510003762 A CN200510003762 A CN 200510003762A CN 100343912 C CN100343912 C CN 100343912C
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- main body
- optical disk
- disk drive
- toothholder
- brake component
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Abstract
The present invention relates to a structure for preventing from gear slippage in an optical disk drive, which comprises a support frame with an elastic flexing part, a connecting seat connected with one end of the support frame, a tooth holder connected with the other end of the support frame and a spacing spring, wherein the tooth holder is provided with a plurality of equispaced rack bars; the spacing spring is provided with a main body spring which is connected with a braking member; the main body spring is supported between the connecting seat and the tooth holder, the braking member is positioned between the connecting seat and the tooth holder, and a space is kept. The spacing spring pushes the rack of the tooth holder to be engaged with a thread groove of a screw rod so as to simplify components and servo control.
Description
Technical field
The present invention relates to a kind of structure for preventing gear slippage in optical disk drive, relate in particular between the tooth bar of read head in the CD player and drive screw and keep suitable engagement, make the read head can fast moving, prevent to jump toothing with what accurately read and write data.
Background technology
The capacity of current optical disc is increasing, and CD is still kept the size of original diameter 12cm, and data of optical disk record position spacing is also dwindled rapidly thereupon.Therefore, CD player is the data on the writable disc correctly, depend on the record position that the fast moving read head is accurately aimed at data of optical disk.
As shown in Figure 1, known CD player read/write head gear train 10 is located at read head 11 on the Connection Block 12, Connection Block 12 1 ends are provided with a toothholder 13, the double wedge 14 of toothholder 13 is engaged in the thread groove 151 of screw rod 15, by motor 16 rotary screws 15, drive the Connection Block 12 of engagement screws 15, utilize screw rod 15 positive and negative rotations and drive Connection Block 12, read head 11 on it is slided front and back apace, to search the data on the CD.
Because times speed of CD player increases continuously and healthily, read head 11 needs the moment fast moving to search data.When screw rod 15 Fast starting or counter-rotating, because inertia effect will force double wedge 14 to break away from the thread groove 151 of screw rod 15.Therefore known CD player is established a spring 17 at toothholder 13 rears, cooperation is the linking arm 18 of elastic deflection suitably, utilize the spring 17 outer elastic force of opening, make double wedge 14 elasticity press the thread groove 151 of screw rod 15, firmly be engaged in the thread groove 151 of screw rod 15 to strengthen double wedge 14, be absorbed in simultaneously to make and go up or assemble the error that goes up backlash between the engagement that produces.If yet spring 17 elastic force are too big, can make double wedge 14 press the thread groove 151 of screw rod 15, thereby increase the friction force of 12 of screw rod 15 and Connection Blocks, cause reducing the transmission torsion of motor, even can not drive Connection Block 12 immediately and move, thereby influence the precision of read head read-write.Otherwise, too little as elastic force, then make double wedge 14 break away from the thread groove 151 of screw rods 15 easily and that tooth takes place to jump is out of hand, and can not absorb effectively to make and go up or the error that produces is gone up in assembling, cause read/write head to search the error of data easily.So the size of elastic force need limit within the specific limits, thereby can not prevent to jump tooth fully, and need relend the servocontrol that helps CD player, suitably adjust the rotational speed and the acceleration of restriction screw rod, to avoid producing the jumping tooth.
For the elastic force that prevents spring can not stop the inertial force that lifting is too big and jump the tooth fault, as shown in Figure 2, another known CD player read/write head gear train 20 utilizes a plate 22 with center pit 221, one end is fixed in Connection Block 21, the center pit 221 of the other end passes spring 26 and is resisted against toothholder 23 back, its end face then keeps an appropriate gap d with toothholder 23 back, and this gap d is less than the length of double wedge 24.When screw rod 25 starts or counter-rotating forms excessive inertial force fast, when pushing double wedge 24 and causing moderate finite deformation, toothholder 23 will touch plate 22.Though stop to contract behind the toothholder 23 by the plate 22 of rigidity and continue distortion, prevent that double wedge 24 from ejecting disengaging screw rod 25, but read head is quite accurate, the translational speed of searching data is quite fast, too much weight increase can influence balance and cause vibration, also will delay the transmission reaction time, must relend the servocontrol that helps CD player inside, with the error of avoiding CD player to read and write data, thereby increase the servocontrol complicacy.Have, read head gear train installing space is limited and volume is very little again, is difficult for the installing plate, installs the cost that plate also will increase part and assembling simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of structure for preventing gear slippage in optical disk drive, reduce cost of parts and assembling degree of difficulty by simplifying member.
Another purpose of the present invention is to provide a kind of structure for preventing gear slippage in optical disk drive, reduces the change to gear train inside, reduces the servocontrol complicacy.
In order to reach the purpose of foregoing invention, structure for preventing gear slippage in optical disk drive of the present invention comprises the bracing frame with an elastic deflection portion, be connected in the Connection Block of this bracing frame one end, be connected in the toothholder of this bracing frame other end, toothholder is provided with a plurality of equidistant tooth bars, and a limit spring.Limit spring has a main body spring and connects a brake component, and the main body spring is shored between this Connection Block and toothholder, and brake component is between Connection Block and toothholder, and keeps a gap.The tooth bar of limit spring pushing tow toothholder is engaged in the screw flight groove, drives read head by a motor and moves around along screw rod, with the data on the writable disc.
The present invention is with the rotational speed of screw rod or the inertial force that acceleration produced, limit spring by simple structure is absorbed and is prevented the toothholder excessive deflection, to keep tooth bar in the position of engagement, needn't be by servocontrol, the rotational speed of adjustment screw rod or acceleration are to prevent to jump tooth, and the main body spring of limit spring extends the brake component of hollow shape frame, and the weight of not too large change read head can be simplified the servo-controlled complicacy of CD player.Main body spring and brake component are same part, but so simplified structure and number of spare parts.Brake component is fixing with the assembling of main body spring, thereby can quicken assembling and save man-hour.
Description of drawings
Fig. 1 is the side view of prior art structure for preventing gear slippage in optical disk drive;
Fig. 2 is the side view of another prior art structure for preventing gear slippage in optical disk drive;
Fig. 3 is the stereographic map that the present invention prevents to jump toothing;
Fig. 4 is the stereographic map of limit spring of the present invention;
Fig. 5 is the side view of structure for preventing gear slippage in optical disk drive of the present invention;
Fig. 6 is the action diagram of structure for preventing gear slippage in optical disk drive of the present invention.
Embodiment
For reaching technological means and the complementary work effect thereof that above-mentioned purpose of the present invention adopts, now lift a preferred embodiment, and be illustrated as follows in conjunction with the accompanying drawings.
With reference to Fig. 3, structure for preventing gear slippage in optical disk drive 30 of the present invention mainly comprises a connecting seat 31, a bracing frame 32, a toothholder 33 and a limit spring 34.One end of this bracing frame 32 connects Connection Block 31, Connection Block 31 is provided with a read head (not shown), the other end of bracing frame 32 then is connected to toothholder 33, toothholder 33 is provided with tooth bar 331, toothholder 33 rear ends are provided with limit spring 34, the tooth bar 331 of limit spring 34 pushing tow toothholders 33 is engaged in the thread groove 41 of screw rod 40, screw rod 40 rotates by a motor 50 (with reference to Fig. 5), through toothholder 33, bracing frame 32 and Connection Block 31, drive read head and move around, with the data on the writable disc along screw rod 40.
Wherein the toothholder 33 of structure for preventing gear slippage in optical disk drive 30 is roughly a flat board, toothholder 33 is provided with a plurality of equally spaced tooth bars 331, the size of tooth bar 331, shape and direction is set need to cooperate the thread groove 41 of screw rod 40, make all tooth bars 331 can embed thread groove 41 and are meshing with each other.In addition, a bracing frame 32 is connected in toothholder 33 1 sides and extends back, and roughly is vertical with toothholder 33.Have an elastic deflection portion 321 in the bracing frame 32, provide toothholder 33 suitable elastic force, allow toothholder 33 appropriateness distortions.The other end of bracing frame 32 is connected to Connection Block 31, and Connection Block 31 is in order to carry a read head.
In addition, as shown in Figure 4, limit spring 34 of the present invention comprises a main body spring 341 and brake component 342, both are formed by a web basically, wherein main body spring 341 can be a coil spring, and brake component 342 is to be stretched out and formed by main body spring 341 1 ends, can be a rectangle frame.The axle of brake component 342 about parallel bodies springs 341, and it is smooth in the outside of main body spring 341, brake component 342 1 ends flush with main body spring 341 1 ends, the length L of brake component 342 is less than main body spring 341, brake component 342 also can increase the winding number of turns of web according to desirable strength, and for example the number of turns of web shown in the present embodiment is 2 circles.With reference to Fig. 5, these limit spring 34 usefulness main body springs 341 1 ends are supported on Connection Block 31, an end pushing tow toothholder 33 rear ends that flush with brake component 342, the end limit of brake component 342 is close to and is approximately perpendicular to toothholder 33 rear end faces, utilize the compression elasticity of main body spring 341, the flexibility that cooperates the elastic deflection portion 321 of bracing frame 32, make tooth bar 331 can with thread groove 41 appropriate tight engagement, suitable thrust to be provided and to reduce error in the assembling.Simultaneously, brake component 342 other end limits and Connection Block 31 planes keep a suitable clearance D, and the spacing of clearance D is less than the height of tooth bar 331.
With reference to Fig. 6, when motor 50 drives screw rod 40 Fast starting or counter-rotating, because action of inertia, the tooth bar 331 of toothholder 33 is forced to move to breaking away from thread groove 41 directions, the distortion of allowing because of elastic deflection portion 321, to make toothholder 33 is the center rotation with elastic deflection portion 321 approximately, moves and compress body spring 341 backward, and then dwindles clearance D.Because the spacing of clearance D is set at the height less than tooth bar 331,, can guarantee that tooth bar 331 and thread groove 41 still keep drive state therefore as long as clearance D has spacing to exist.Yet when inertial force is too big, toothholder 33 is compress body spring 341 energetically, cause the clearance D spacing to disappear, and the end limit that makes brake component 342 presses to Connection Block 31, shore toothholder 33 by upright brake component 342, make toothholder 33 upper racks 331 unlikely disengaging thread grooves 41, thereby it is unlikely out of control to keep drive state.When inertial force reduced or disappear, by the elastic force of main body spring 31 and elastic deflection portion 321, the tooth bar 331 of pushing toothholder 33 again entered the position of engagement of screw rod 40 thread grooves 41, the effect that recovers normal mobile read head.
Therefore, structure for preventing gear slippage in optical disk drive 30 of the present invention is the rotational speed of screw rod 40 or the inertial force that acceleration produced, and the limit spring 34 by simple structure is absorbed and prevents the toothholder excessive deflection, to keep tooth bar in the position of engagement.Therefore can be by the inner servocontrol of CD player, adjust the rotational speed of screw rod 40 or acceleration at preset range to prevent to jump tooth, and the brake component 342 of limit spring 34 is the hollow shape frames that directly extended by main body spring 341, do not cause the weight of read head to change too big, can simplify the servo-controlled complicacy of CD player, to improve the stability of product.Have again, the brake component 342 and the main body spring 341 of limit spring 34, be actually the same part that is shaped together, not only but simplified structure and number of spare parts reduce cost, and brake component 342 is fixed with 341 assemblings of main body spring, do not need to occupy or plan additional space, can quicken assembling yet and save man-hour, improve product market competitiveness.
The above only is the preferred embodiments of the present invention for convenience of description, and scope of the present invention is not limited to described preferred embodiment, not breaking away under the design condition of the present invention according to any change that the present invention did, all belongs to protection scope of the present invention.
Claims (6)
1. structure for preventing gear slippage in optical disk drive comprises:
One bracing frame has an elastic deflection portion;
A connecting seat is connected in an end of this bracing frame;
One toothholder is connected in the other end of this bracing frame, is provided with a plurality of equally spaced tooth bars; And
One limit spring has a main body spring and connects at least one brake component, and this main body spring stays between this Connection Block and the toothholder, and this brake component and keeps a gap between Connection Block and toothholder, and the spacing in described gap is less than the height of tooth bar.
2. according to the described structure for preventing gear slippage in optical disk drive of claim 1, wherein said brake component one end connects main body spring one end, and flushes with the main body spring.
3. according to the described structure for preventing gear slippage in optical disk drive of claim 1, wherein said main body spring is a coil spring, and brake component is extended by main body spring one end and forms a rectangle frame, is parallel to the outside of main body spring.
4. according to the described structure for preventing gear slippage in optical disk drive of claim 1, wherein said brake component is perpendicular to toothholder and Connection Block.
5. according to the described structure for preventing gear slippage in optical disk drive of claim 1, wherein said main body spring and brake component are that same web forms.
6. according to the described structure for preventing gear slippage in optical disk drive of claim 5, wherein said brake component is that several materials of multi-turn are to gain in strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100037628A CN100343912C (en) | 2005-01-11 | 2005-01-11 | Structure for preventing gear slippage in optical disk drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100037628A CN100343912C (en) | 2005-01-11 | 2005-01-11 | Structure for preventing gear slippage in optical disk drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1805023A CN1805023A (en) | 2006-07-19 |
| CN100343912C true CN100343912C (en) | 2007-10-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100037628A Expired - Fee Related CN100343912C (en) | 2005-01-11 | 2005-01-11 | Structure for preventing gear slippage in optical disk drive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100343912C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101312053B (en) * | 2007-05-22 | 2013-02-13 | 鸿富锦精密工业（深圳）有限公司 | Optical disk drive |
| CN101471107B (en) * | 2007-12-28 | 2010-11-17 | 广明光电股份有限公司 | Position limiter of CD player |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05234281A (en) * | 1991-12-28 | 1993-09-10 | Sony Corp | Pickup device feeding mechanism |
| JPH08138333A (en) * | 1994-11-04 | 1996-05-31 | Toshiba Corp | Disc player |
| JP2001210028A (en) * | 2000-01-26 | 2001-08-03 | Hitachi Ltd | Optical disk device |
| JP2003203439A (en) * | 2002-01-09 | 2003-07-18 | Matsushita Electric Ind Co Ltd | Optical disk apparatus |
| JP2003249042A (en) * | 2002-02-22 | 2003-09-05 | Ricoh Co Ltd | Optical pickup feed device and optical disk unit |
-
2005
- 2005-01-11 CN CNB2005100037628A patent/CN100343912C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05234281A (en) * | 1991-12-28 | 1993-09-10 | Sony Corp | Pickup device feeding mechanism |
| JPH08138333A (en) * | 1994-11-04 | 1996-05-31 | Toshiba Corp | Disc player |
| JP2001210028A (en) * | 2000-01-26 | 2001-08-03 | Hitachi Ltd | Optical disk device |
| JP2003203439A (en) * | 2002-01-09 | 2003-07-18 | Matsushita Electric Ind Co Ltd | Optical disk apparatus |
| JP2003249042A (en) * | 2002-02-22 | 2003-09-05 | Ricoh Co Ltd | Optical pickup feed device and optical disk unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1805023A (en) | 2006-07-19 |
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Granted publication date: 20071017 Termination date: 20100211 |