CN2544293Y

CN2544293Y - Objective lens support device

Info

Publication number: CN2544293Y
Application number: CN 02236002
Authority: CN
Inventors: 彭立仲; 张骐麟
Original assignee: HONGJING SCIENCE AND TECHNOLOG
Current assignee: Via Technologies Inc
Priority date: 2002-05-23
Filing date: 2002-05-23
Publication date: 2003-04-09
Anticipated expiration: 2012-05-23

Abstract

The utility model relates to an objective bearing device, by connecting one ends of an upper supporting part and a lower supporting part which are unparallel to each other to an objective frame and connecting the other ends thereof to a fixed seat of a supporting arm, the objective arranged on the objective frame does not produce a dip angle when yawing; and the elastic fixed seat of the supporting arm also leads high-frequency resonance frequency to move to a frequency range that is repressible, thus improving the stability of an optical read and write head in the processes of reading and writing.

Description

The object lens bogey

Technical field

The utility model relates to optical element physical construction, especially specifically is a kind of object lens bogey.

Technical background

Utilize laser beam (as semiconductor laser) reading and recording early well known in the technology of optical record medium (as CD or DVD CD-RW discsCD-RW), laser beam focuses on the track (track) on CD-RW discsCD-RW surface by the object lens in the optical read head (objective lens), utilize optics to pick up again and know that the light echo that device (photo detector) will reflect from CD-RW discsCD-RW is converted to the regeneration signal, can obtain to be recorded in the data of CD-RW discsCD-RW, and reading in the process in data, also must in light echo, obtain and follow rail signal (tracking signal, TS) and focus on signal (focusing signal, FS), control respectively and follow rail driver (tracking actuator) and the in time mobile object lens of focus driver (focusing actuator) with focusing on signal according to following the rail signal, guarantee that laser beam can correctly focus on the predetermined track in CD-RW discsCD-RW surface.

In order to finish the servo operation that follows rail and focusing, object lens essential can be freely in optical axis direction (both focus direction, focusing direction), and the radial direction of CD-RW discsCD-RW (is promptly followed the rail direction, tracking direction) motion, therefore need special bogey to support object lens, and stable movement is provided, known object lens bogey roughly comprises following several types:

1, line style bogey (wire-supported type): for example all have open among the United States Patent (USP) No. 5381273, No. 5555623 and No. 5587845.In this design, object lens are supported by four rubber-like metal wires (as stainless copper cash), these metal wires are parallel to each other, wherein an end maintains static, the other end then is linked to objective carrier (lens holder), therefore objective carrier and object lens just can move in two different directions under the promotion that follows rail driver and focus driver, finish the servo operation that follows rail and focusing, but this kind design can be when following the servo operation of rail and focusing, four metal line are twisted, cause the error of following rail and focusing operation.

2, utilize the object lens bogey of sheet type spring (leaf spring): for example disclose a kind of mode of utilizing four parallel plate type springs to support object lens in No. the 5892628th, the United States Patent (USP), in No. the 5453881st, United States Patent (USP), then disclose in addition a kind of only utilize two parallel to each other on the technology of shell fragment and following shell fragment support object lens, but both all are difficult for finishing aspect production and assembly these.

3, the object lens bogey (axial sliding and rotating typedevice) of rotation and sliding-type: No. 5587845 Fig. 1 is disclosed as United States Patent (USP), the objective carrier of this bogey and object lens are installed in a reach (supporting shaft), and can be under the promotion that follows rail driver and focus driver endwisely slipping along reach, or be that oscillating motion is done in the axle center with the reach, finish the servo operation that follows rail and focusing, but it must control the size that objective carrier cooperates with reach exactly, so can increase the difficulty of manufacturing, in case and reach is not good with cooperating of objective carrier, will cause shaking of objective carrier easily.

But, no matter use above-mentioned which kind of object lens bogey, when optical read/write head reads CD-RW discsCD-RW, all can cause object lens to change, and effect is read in influence, therefore in the inclination angle of track tangential direction, row is designed a kind of object lens bogey again, change to improve aforesaid inclination angle, read effect and promote, real is necessary.

Summary of the invention

Fundamental purpose of the present utility model is provides a kind of object lens bogey, with when optical read/write head is read and write CD-RW discsCD-RW, do not cause object lens to produce the inclination angle at slip-angle steering (Yawing), and the high-frequency resonance frequency is moved in the quenchable frequency range, to promote the degree of stability of optical read/write head when reading and writing.

The purpose of this utility model is achieved in that

A kind of object lens bogey is used for object lens of the optical system of bearing optical pick-up head, and this device includes:

One objective carrier has a reception hole that runs through and is used to carry these object lens;

One sway brace holder, it has elasticity, and is located at relatively that the optical axis of these object lens is motionless position; And

One upper support portion and support portion once correspond to each other, and arbitrary this support portion has elasticity, and an end is connected in this objective carrier, and the other end is connected in this sway brace holder, and intersect in the position of crossing this sway brace holder after extending two support portions.And

This upper and lower support portion has parallel each other a plurality of sway braces respectively, and respectively this sway brace corresponds respectively to the one sway brace of another group, and corresponding each other both are intersected in the position of crossing this sway brace holder after extending.

This sway brace holder has a pedestal and an elastic body, and wherein this elastic body is arranged at the one side of this pedestal, and is connected with this upper and lower support portion.

This elastic body is a thin plate.

According to object lens bogey disclosed in the utility model, have following good effect:

1, because object lens bogey disclosed in the utility model, system is in order to the object lens in the optical system of bearing optical pick-up head, this device includes objective carrier, the sway brace holder, upper support portion and lower support portion, wherein objective carrier is in order to the carrying object lens, and the sway brace holder has elasticity, and the optical axis of being located at relative object lens is motionless position, and on, lower support portion corresponds to each other, and arbitrary support portion all has elasticity, one end is connected in objective carrier, the other end is connected in the sway brace holder, and intersect in the position of crossing the sway brace holder after extending two support portions.Therefore by nonparallel two support portions of the present utility model and the flexible sway brace holder of tool when optical read/write head reads video disc, can repeal by implication by the rightabout object lens inclining angle that both caused respectively, and make object lens at the unlikely generation of slip-angle steering inclination angle;

2, the flexible sway brace holder of the utility model tool moves in the quenchable frequency range high-frequency resonance frequency, so unlikely the generation with other element resonated, and make damping bring into play maximum utility, and the resonance mode that has no adverse effects appears in the high frequency frequency domain, can also damping suppress the resonant frequency of high frequency, and promote the degree of stability of optical read/write head when read-write.

Description of drawings

Fig. 1 top view of the present utility model;

Fig. 2 side view of the present utility model;

Fig. 3 object lens bogey of the present utility model is in the synoptic diagram of six-freedom degree;

Fig. 4 optical read/write head when reading CD-RW discsCD-RW, because of upper and lower two parallel support portion causes in the inclination angle of object lens slip-angle steering (Yawing);

Fig. 5 optical read/write head is when reading CD-RW discsCD-RW, because of the sway brace holder does not have the inclination angle of elasticity cause in object lens slip-angle steering (Yawing);

Fig. 6 optical read/write head of the present utility model is when reading laser disc, because of non-parallel upper and lower support portion and rubber-like sway brace holder, and the unlikely synoptic diagram that causes object lens in the inclination angle of slip-angle steering (Yawing).The piece number contrast:

Objective carrier (Objective lens holder) 10

Reception hole (access hole) 11

Sway brace holder 20,20

Pedestal 21

Elastic body 22

Upper support portion (upper supporting portion) 30,30 '

First sway brace (supporting arm) 31

Second sway brace 32

Lower support portion (bottom supporting portion) 40,40 '

The 3rd sway brace 41

The 4th sway brace 42

Object lens (objective lens) 50

Embodiment

For making the purpose of this utility model, structural attitude and function thereof there are further understanding, cooperate diagram to be described in detail as follows now:

As Fig. 1,2 and shown in Figure 3, object lens bogey disclosed in the utility model, the object lens 50 (objectiv lens) that are used for the optical system of bearing optical pick-up head, this device include objective carrier 10, sway brace holder 20, upper support portion 30 and lower support portion 40.

Objective carrier 10 (Objective lens holder) has the reception hole 11 (accesshole) that runs through, laser beam is focused on the object lens 50 on the data record surface of CD-RW discsCD-RW in order to carrying, and this objective carrier 10 can follow radial direction and focus direction FD (Focusing direction) motion of rail direction TD (Tracking direction) with CD-RW discsCD-RW with object lens 50, wherein following rail direction TD and be exactly CD-RW discsCD-RW radially, is exactly the optical axis direction of laser beam or object lens 50 as for focus direction.

Sway brace holder 20 has elasticity, and the optical axis of being located at relative object lens is motionless position, and sway brace holder 20 has pedestal 21 and elastic body 22, and wherein elastic body 22 is located at the one side of pedestal 21, and is thin plate.

Upper support portion 30 (upper supporting portion) and lower support portion 40 (bottomsupporting Portion), both correspond to each other, and

arbitrary support portion

30,40 has elasticity, one end is connected in objective carrier 10, the other end is connected in sway brace holder 20, intersect in the position of crossing sway brace holder 20 after extending two

support portions

30,40.

And upper support portion 30 has parallel each other first sway brace 31 (supporting arm) and second sway brace 32, first, two

sway braces

31,32 1 ends are connected in objective carrier 10, the other end is connected in the elastic body 22 of sway brace holder 20, lower support portion 40 also has the 3rd parallel each other sway brace 41 and the 4th sway brace 42, the 3rd, the

4th sway brace

41,42 1 ends are connected in objective carrier 10, the other end is connected in the elastic body 22 of sway brace holder 20, and first sway brace, 31 corresponding the 3rd sway braces 41, second sway brace, 32 corresponding the 4th sway braces 42, and two corresponding each other sway braces can intersect in the position of crossing sway brace holder 20 after extending, intersect as meeting after

first sway brace

31 and 41 extensions of the 3rd sway brace, and second sway brace 32 and the 4th sway brace 42 can be crossing after extending.

As shown in Figure 4, in two support portions 30 ', when 40 ' both parallel and optical read/write heads read CD-RW discsCD-RW, object lens 50 can move along with the video disc dipping and heaving, thereby sway brace holder 20 is provided along the thrust and the pulling force of upper and lower support portion 30 ', 40 ' direction, so can produce rotatablely move (Pitching) of roll steer, make object lens produce the inclination angle at slip-angle steering (Yawing), but simultaneously have elasticity because of sway brace holder 20, so sway brace holder 20 can also damping suppresses the resonant frequency of high frequency.

As shown in Figure 5, do not have elasticity at sway brace holder 20 ', and optical read/write head is when reading CD-RW discsCD-RW, object lens 50 can move along with the video disc dipping and heaving, thereby make object lens produce the inclination angle at slip-angle steering (Yawing).

As shown in Figure 6, not parallel each other in two

support portions

30,40 of the present utility model, and under the sway brace holder 20 rubber-like situations, above-mentioned object lens will be repealed by implication at two reverse direction inclination angles of slip-angle steering (Yawing), and can not produce the object lens inclination angle.And upper and

lower support portion

30,40 and sway brace holder 20 can reduce the inclination angle that object lens 50 were produced in low frequency when motion focusing, and sway brace holder 20 can also damping suppresses the resonant frequency of high frequency.

So when object lens 50 carry out the low frequency focusing, optical R/W pickup lens bogey can be possessed the vibrations mode of focus direction, make optical read/write head when low frequency is done, have only the action of focus direction FD, also can increase the rigidity of object lens suspension apparatus on (Rolling) direction of rolling simultaneously.And when object lens 50 carried out the high frequency focusing, optical R/W pickup lens bogey can reduce the high-frequency resonance frequency, and unlikely the generation with other element resonated, and made damping performance maximum utility, and the resonance mode that has no adverse effects appears in the high frequency frequency domain.

According to object lens bogey disclosed in the utility model, it includes following effect:

1, the utility model sees through non-parallel upper and lower support portion and rubber-like sway brace holder, and makes object lens at the unlikely generation of slip-angle steering (Yawing) inclination angle.

2, the utility model sees through rubber-like sway brace holder, the high-frequency resonance frequency is moved in the quenchable frequency range, so unlikely the generation with other element resonated, and make damping bring into play maximum utility, and the resonance mode that has no adverse effects appears in the high frequency frequency domain, to promote the degree of stability of optical read/write head when reading and writing.

The above person only is the utility model preferred embodiment wherein, is not in order to limit practical range of the present utility model; Be that all equalizations of being done according to the utility model claim change and modification, be all the utility model claim and contain.

Claims

1, a kind of object lens bogey is used for object lens of the optical system of bearing optical pick-up head, and this device includes:

One upper support portion and support portion once correspond to each other, and arbitrary this support portion has elasticity, and an end is connected in this objective carrier, and the other end is connected in this sway brace holder, and intersect in the position of crossing this sway brace holder after extending two support portions.

2, object lens bogey according to claim 1, it is characterized in that, this upper and lower support portion has parallel each other a plurality of sway braces respectively, and respectively this sway brace corresponds respectively to the one sway brace of another group, and corresponding each other both are intersected in the position of crossing this sway brace holder after extending.

3, object lens bogey according to claim 1 is characterized in that this sway brace holder has a pedestal and an elastic body, and wherein this elastic body is arranged at the one side of this pedestal, and is connected with this upper and lower support portion.

4, as object lens bogey as described in the claim 3, it is characterized in that this elastic body is a thin plate.