JPS58189846A - Objective lens driving device of optical pickup - Google Patents

Abstract

PURPOSE:To realize easily miniaturization and light weight, by winding a tracking drive controlling coil and a focus drive controlling coil around one bobbin, using the bobbin in common, and using a tracking drive controlling permanent magnet and a focus drive controlling magnet in common by conbining both. CONSTITUTION:In a figure, 10 is an objective lens, 11 is a lens barrel incorporating and fixing the lens 10 concentrically, and 12 is a square and cylindrical bobbin inserted and fixed on the outer circumference of the barrel 11 coaxially, and the 1st coil 13 and the 2nd coil 14 are wounded around the bobbin with the steps described later. In a figure, 15 is a magnetic circuit assembly arranged fixedly around the bobbin 12. The bobbin 12 is a nonmagnetic substance product made of thin paper or plastic moldings. The magnetic circuit assembly 15 consists of a split yoke 16 and a couple of permanent magnets 17, 17. As the yoke 16, upper/lower two-split construction is used to make the assembling easy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an optical disc system equipped with a 111] H conversion system used in an optical pickup for journals.

Optical disk systems using laser light have recently been attracting attention from performance, eyelids, and eyelids as hand tools that provide the aspiration of images, sounds, and external 7-eye memory◆. ing. This optical disk system has a recording medium such as a day plate-shaped disk with the following information:
A light spot focused by an objective lens is focused on the rectangular track recorded on the track, and the reflected light from the track is detected by a light receiving condenser (7 photodiodes).
18th issue, 1st victory, this is a secret, audio, 7 eye V
It is common to use a soft retrieval system that generates a memory number key.

The optical big 1st optical disc system used in the optical disc system uses a 9-inch thread head (2i f alignment, and the head (21-disk crotch) in a stratum of 1,000,000,000 yen, while disc 1 and flat?' (4) A focused optical spot of the O laser beam is moved over the disc illumination track, and the reflected light from the track is passed through the same objective lens (through the lens and threaded with a thread TII). It is reflected and detected by the light-receiving device 11i1, and the trunk 02 report is reproduced.In order to accomplish this goal, as shown in the moving diagram, the disk (formed in 11 and 9 Track (projected from objective lens il+ to 7, phototravel spot)
Ill have the same size and center #I of track 41)
It is necessary to stop the AI and feed it. Therefore, the relative position of the objective lens (3) and the disk (1) is detected in order of t m and the objective lens (8) is transferred in order of t. Ushigokuman 10j (Kukata Oka) 0th place IM sodome (Tracking IIIm>, direction in step with disk +11 (both sides same) 0th place Maro sodome (Focus * J #) t) Zizushi J axis direction , and therefore vs.
The lens (3) is supported in two orthogonal directions at least in the x'jj direction and 20,000 yen, and the head is made to be assembled by the company (needs to be assembled on the 1st). It is also appreciated that this support and cambered single wheel is rounded, compact, and has a track that maintains good responsiveness.

The 4Ik tree of such an objective lens is generally supported by a ceramic support, and the ly, *Jvk barrel of the objective lens is generally supported by a coil and a permanent magnet. It is true. Example I, conventional objective lens structure
* For ws, J@Fj at the top and bottom of the lens support
'rK winding method 1iJ is the tracking drive IFlii
The Koi car for III- and the Focus 11-type Hosokawa carp ship are connected to each other via a bobbin, and the heads are connected to the main wire near each carp wheel of Rikihito. L1, burn the coils facing each Mizuku 6's world, and ':j! ? The electrician ao7j who can carry a carp and the m of a large coat
- Move the lens support w4 in the X direction and 20,001 j ID - axis direction via the coil using the 7-naming law.
Many things are used for special purposes. Such a single drive unit has the advantage of being relatively responsive and has the advantage of being relatively responsive, but one with a relatively low price tag requires a tracking drive coil and a permanent *b, 7 Because the coils and permanent magnets of the Orcus body are placed independently and at different locations, it is difficult to miniaturize the body, and because of this body structure, the objective lens support mechanism tends to be complicated and bulky. It was there. In addition, due to the roundness of the coil disposed close to the magnetic pole direction of the permanent magnet, there is a lot of leakage that is not applied to the coil of the permanent magnet, and the efficiency is very high. The K that gives # requires a strong permanent magnet, and the capacity of the moat source is also large, which sends a 1m flow to the carp jL/, which is inconvenient, such as increasing the number of young turtles. The present invention has been made in view of the same point, and aims to improve the efficiency of the anaerobic circuit by reducing the size of the electric current, and by making this TTF, it provides the structure of nine objective cylinders. do.

The invention is on top! , - As a manual design, it is intended to standardize the collection of age products, and the tracking body 11II #lI river coil and the focus drive ##h spider arranging trick are attached to the /ri bobbin. A coil is wound around the bobbin in the magnetic gap of the K circuit. It is characterized by the common use of permanent magnets. By using a common bobbin and permanent magnet, the number of parts to be used is reduced and the overall size is reduced. In addition, by minimizing the leakage magnetic flux of the permanent magnet with carbon dioxide, [L
Below 0, the barrel of the present invention is under pressure to improve the effectiveness of the circuit.
This will be described together with the embodiment shown in Figure t (3).

At the location J diagram to Juku≦I, the objective lens and the objective lens uO are fixed in a uniaxial manner with the inner paper.
lI are rectangular pottery-shaped bobbins with 1 to 1 Kinshin 1 added to Hitoshi's outer chest in the shape of a shaft; KO 414/(14 is fF-.--The bobbin fin is divided into a set of nine beasts, and the bobbin fins are made of non-magnetic materials such as *a and glass chinks. So, sugar 2 prisoners [7F Suyo, V hook @
(lz*) (1mb) (18・ba 131 (L) and Kotsu* same hook (xgb) (xta) 0 upper and lower - with old pieces (12・) (1λf) studied inward. The tip of each tongue piece (12.) (1st edition) supports the lens.
The outer circumference of uu! It is fixed with OK adhesive or the like.

The above bobbin ugKFimm (l breath m) ~ (Ifl) qtiK First @/Carp J4/Q! Il is continuously wound in a direction perpendicular to the optical axis direction of the objective lens. This No. 4/ll The opposite work of one of the crows*
(Igm) (114 units) Horizontally roll the above (Wl)
) (Ifl) and save. Next, place the Juku J carp on the side of the cocoon-shaped cocoon shaped cocoon of the bobbin μ, and place the Juku J carp on the cocoon-shaped cocoon 1 so that there are 9 nodules in the Juku J diagram. Continue reading 1. Rima), bribe J Koi J4/cheeks are one opposing #! It is wound in a force struggle parallel to the two directions on I dislike (l ni a) (l Jia). This liJ Koi s/Ht) 111
11m (ll1m) (1!o) The one above has the blood roll (W, XI,) and Kanopu.

Magnetic circuit *[The body weight is composed of the following division Sugimaro - Ryu and one pair of permanent magnets 9η9 forces. The thread is parallel to each f111I wax (1 inch) to (1 breather) of the bobbin thread at a predetermined interval.
~(144) and one opposing outer space (16m) (
1io) Insert the bobbin inward from the top and bottom ends.
of *Jm (l laziness) (lem) t-horizontal part (16
・)(1-・)(lSenser)(lit)
:J” horizontal part (l...) (16.) and (lsr)
Each tip of (lsr) is i1! It is composed of -i (16g) and (1i), and (lem) -(1...)-(
l axis) -(16・) closed loop, -J of bobbin l force
Jil (l birda) circle, outside this closed loop ll11
Seven permanent magnets it'71 are added to the inward direction of the capital (lem). Other than the housing (US) - (L feeling 1) - (1mm
) -(xgr) closing~-g, the bobbin IJ 10 other 匈J11(ljl・)'1kTh, the permanent m me 7 of the cabinet 10 of the outer capital (llo) of this closure is facing. Being yelled at. Each permanent i1;bf17+97 has an inner wax part (16g) (
14 years ago, there was a certain gap between the fourteenth century, and there was a loss of humanity.
Magnetized by...
(I use it as a season.And each #l1iJi
L Cag (GJ Shin) K bobbin 1-(lJ2a)
X1 book, 0) tale 1llk, 4 cranes whose graves match the horizontal II # rotation (Wyo) (Wyo) (Wyo) of the 1st carp M- and the ζO water horizontal - rotation part Wyo) (Wl). - ^-it arrangement of the 1st volume (wJ! Ruts are being applied from one direction.

The above-mentioned Sori 1JfSVi example has a structure that is divided into upper and lower halves to facilitate assembly. This decoy is fixed at the head body of the pickup - JK, and the lens support WIJ (I and bobbin One end is fixed to the other end or one bobbin lJIk (1, gb) (x
What should I do using the gate damper Qal and the gate damper of the total V with the vertical direction VC fixed for This corrugated gunper σ81 or... freely moves the bobbin 4 and lens support FIiIII circle forward only in the upper and lower two axis directions and the X-axis direction in the 11th direction.

In the above configuration, Bobbin's school of resentment/Koikai is conveniently used for 7 orcus 1 system # rivers. Tsukenyo, @/Koi N/I
! Demon who sends current from one direction of GK and Araki Gamp CQJ
Horizontal winding part of CQI prisoner (W work XI,) K is Km in X direction
The flow is flowing, and the social world is joining Jin's turtle style station KFiY force direction, so the horizontal winding part (Wyo) (WI
)Kg direction force acts on the bobbin and lens support 1itllJFiK, IJ by 9, and the objective lens 1 is controlled by focus 1. The other one is also cocoika fl
ft) used for ranking ships 1 controlled river. In other words, when a current is passed through the QQ
) in the running direct winding capital (-) (Wl ri K, same as above, l12 flows in either of the two directions downward, so vertical ms times M (W,) (W,) is in the X direction @JK Received external force, this is K
The objective lens (2) is controlled by tracking 8ii11. Such tracking
The light is reflected from the trunk of the disk, and the focus difference is detected during the outgoing signal at 1m.
The current flowing through the first cocoil Q416C in the Fu/Koika Tateba is held to instill great heat in the middle of the day.

In addition, this paulownia is not limited to the example of Jokisou, and the example is especially the light of the truck direction @ JK.
A pigeon house that must be used to prevent image distortion is the support structure for the objective lens, including the entire Tomomoto school (light source/receiver, beam splitter, 1/, * * &, hawk, etc.) 1- Supporting 411 formations *1ii1tll
It may be stored in J. This is a pigeon house that uses a mirror to deflect the light into one corner and then input it into the corner mirror.
It is also possible to store the t-lar and objective lens in a pair, and the shape of the loaf is 81 wrinkles for each river boat, and the elastic support is full gate dunn, and 4 f (FM must be determined). It is also possible to replace the elastic rubber plate K1111 on the riverboat.

As mentioned above, I would like to share the bobbin by rotating the 5-piece Takameisha 7 pobbins with a tracking drive 1W #Migawa carp boat and 7 Orcas 1IAf IIJ system Misakigawa carp boat, sharing the bobbin, and tracking the length with 1 chest for the Misaki carp boat. Since the Kamaishi and 7-Oichikasu 1# Ainaga Kamaishi have been combined and shared, the number of parts has been reduced, and a small electrified machine can be used for '8Jl machines, and it can be used for commercial ships such as FBI-specific koshikisho. The same can be said. Since the efficiency of the first line of the beast is increased by using a tungsten carbon fiber, the coil's power supply capacity can be reduced while permanent magnets are being downsized, and a university-style pickup with less dust generation can be provided.

[Brief explanation of drawings]

艷/Diagram and Kakuko Zumine A schematic side box diagram and operation explanatory diagram of the optical pickup, 艷Jintanp cram school〆The figure is a perspective view and a plan view of the buttocks part of an embodiment of Honya Kiri. , @J diagram and 411J section Tyo=Tyo-and-1cho, #I along IIK
The l pin of the r-figure, the 2nd figure, and the l pin of the 艷i-into 艷J figure; the diagonal for escaping the town of I~? Figure 1IiI is shown. Hit...Objective lens, 01)...Lens holder, Suzu...
Coil bobbin, 1... Carp 3, I...@- coil, 1J511... Rut gL circuit structure, IQ... Sori, i1η... Permanent magnet, i18... Stretchable cylindrical body ( (i
J... & Ki gap, (W engineering)... Bribe/Koika's horizontal 5
lah, (w,)...the ghost part of the first coil. Figure 1g43//) Figure 4 Figure 5 Figure 6 Addition

Claims (1)

[Claims] il+ A lens support tube containing an objective lens having an optical axis, a nine-square-shaped bobbin defined on the outer periphery of the lens holding tube, and a winding 1 in the direction perpendicular to the epoch axis.
Sare Kudo/Koika and Gaigang KI on one side opposite the main bottle
IQ is wound in a direction parallel to the optical axis, and the 9th coil is wound on the opposite stiffness of the bobbin.
Assemble the E connector into the magnetic X gap and connect it with the magnetic path structure.
Optical pink-up objective lens drive for 1 hour