JPS60627A - Driving device of objective lens in optical disc player - Google Patents

Abstract

PURPOSE:To form properly an image of light spot on an information track while absorbing wave motion due to resonance/buckling by adhering a damper member on an outer circumferential face of a spiral plate spring made of an elastic member so as to constitute the damper member and providing fixedly the outer circumference of the spiral plate spring and the outer circumference of the damper member to an outer frame incorporatedly. CONSTITUTION:The damper member 22 is constituted incorporatedly to an outer circumference side of spiral springs 9, 10 while adhering the member 22 by an adhesives or the like. Further, the outer circumference of the spiral springs 9, 10 is mounted to the outer frame 1 while being clipped respectively with the damper member 22 and spacers 11, 12. Through the constitution above, in giving a focusing signal to a coil 8, the objective lens 16 is displaced in the direction of optical axis by the drive of the spiral springs 9, 10 made of an elastic member. The wave motion due to buckling caused with respect to the tracking drive and the focusing drive or the wave motion due to resonance caused at the focusing is absorbed completely by the damper member 22 and the outer frame 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the drive control of an objective lens in an optical disc player, and in particular, eliminates resonance and buckling phenomena during focusing operation, and enables accurate and efficient damping operation! III
It is what makes you do it.

In general, in optical display players, there is a problem in that when the focusing operation or the tracking knob is operated, the optical sub-focus by the objective lens does not accurately form an image on the 13-signal track. The reason for this is that the focusing or tracking drive fire is each composed of a plurality of leaf springs, and these leaf springs do not operate properly in response to the signal. That is, the forcing means for displacing the objective lens in the optical axis direction in order to correct the error in which the light spot is not properly focused on the information track is functionally disposed above the tracking means. Common. For this reason, the focusing means must be small and have a calming effect, and its configuration is driven by an electromagnet of 1 cm C, but the relationship between the current flowing through the fill and the displacement (transfer control) of the objective lens causes a resonance phenomenon, which causes the light spot to move on the information track. The image is not formed properly.Also, when the two elastic members, that is, the spiral leaf spring for focusing drive and the leaf spring for tracking drive, are rotated, the positioning is caused by the operation of both leaf springs. There were also cases where the light spot was not properly focused on the information track due to the MfA phenomenon.

In order to eliminate the resonance phenomenon or buckling phenomenon during the above-mentioned 7-force switching operation, the present invention comprises a structure in which a tambour material is attached to the outer peripheral surface of the spiral leaf spring made of an elastic material. By fixing the outer periphery of the damper material into an integral outer frame, waves caused by resonance and buckling phenomena can be absorbed.
It is an object of the present invention to provide an objective lens driving device that accurately images a 0 spot on an information track.

The configuration of the present invention will be explained below based on the drawings.

FIG. 1 is a vertical cross-sectional view of the movement control device of the objective lens of an optical TiSF player embodying the present invention, FIG. 2 is a top plan view of the top surface of FIG. FIG. 4 is an enlarged plan view of the elastic member for driving the hook shown in the device α, and FIG. 4 is a side plan view of FIG. 3.

A ring-shaped permanent magnet 2 fixed to a cylindrical outer frame 1 and ring-shaped yokes 3 and 4 are integrally constructed. The inward tilt of the yokes 3 and 4 is such that a coil holding cylinder 6 is disposed, and its base end 61
is an elastic member, that is, a plate spring 19.2 made of an elastic material, which will be described later.
It is fitted and attached to a ring-shaped holding member 7 in which 0 is implanted.

Further, a movable coil 8 is wound around the outer periphery of the holding cylinder 6, and faces the permanent magnet 2 having a circular shape.

The end of the coil holding cylinder 6 extending upward is connected to a spacer 11 disposed in the outer frame 1 through a circular spiral spring 9 made of an elastic material. It is equipped and equipped. Further, on the outer periphery of the cram end 61 fitted and attached to the holding member 7, a spacer 12 disposed inside the outer frame 1 is attached via a circular spiral spring IOY having the same structure as the spiral spring 9 described above.

Above the spiral spring 9, a yoke holding frame 13 is attached, and a fixed yoke 14 and 15 fixed magnets are integrally trapped.

A fixed coil 17yl that drives the objective lens 16 disposed at the center of the fixed yoke 14 in a direction perpendicular to the optical axis.
-Wrapped. The objective lens 16 is fixed integrally with the lens frame 18, and a ring-shaped 6μ lens 21 is fitted and attached to the outer periphery of the objective lens 16. Further, a gap is formed between the lens frame 18 and the magnetic band 21, and a plate spring 19 made of a pair of elastic phases moves the objective lens 16 in the direction perpendicular to the light 1111 in the gap.
One end of 20 is inserted and fixed with adhesive or the like. Furthermore, the other ends of the leaf springs 19 and 20 are inserted into grooves formed corresponding to the holes of the ring-shaped holding member 7, and fixed with an adhesive or the like.

The circular spiral springs 9 and 10 that drive the objective lens 16 in a direction perpendicular to the optical axis are shaped like linogs, with a hole in the center and a spiral hole between one hole and the outer periphery, as shown in FIG. Several are forming. A damper member 22 is attached to the outer circumference fl of the spiral springs 9, 100 using a bonding agent or the like to form an integral structure. Further, the outer periphery of the spiral springs 9 and 100 is held by the outer frame I by the Danova member 22 and the spacer 11, 12, respectively.
K is installed. The most suitable material for the tambour material 22 is, for example, highly viscous glutyl rubber 1, a mixture of bamboo glutyl rubber and silicone resin (a), or silicone resin.

In this invention configured as described above, when a forcanog signal is applied to the coil 8, the spiral spring 9 becomes elastic 4 (more lI).
, 10, the objective lens 16 is displaced in the optical axis direction. Also, the tracking number (I) is coil 17. l”l
When given to , the elasticity 4A becomes fi hane l 9, 2
0 is driving force and objective renos 16 is 1 for notIIIVc.
displacement in the angular direction.

The wave of the seat 111 phenomenon that occurs in connection with the I.Ratsukinog drive and the 7 Okanda drive shield or the resonance phenomenon wave that occurs during focusing is caused by the damper material 22 attached to the spiral springs 9 and 1o.
Furthermore, by attaching a VC integrated with the tapper to the outer frame 1, it is possible to accurately focus dl11 without any problems.

]0 may be used alone, and if the resonance phenomenon or buckling phenomenon is strong, it is of course necessary to paste the mark on both sides of the damper material 22χ spiral spring 9゜10, and also while pasting the Danover material 22. It is determined by whether the resonance phenomenon or buckling phenomenon is strong or not.

The amplitude control of the spiral spring 9°10 can be further improved by attaching the Danover material 22 without impairing the characteristics of the spiral spring 10. ．．
The effect of making it possible to perform damping drive with accuracy is huge (+1).

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a drive control device for a merry lens of an optical disc player according to the present invention, and rl<2 is a plan view of the top surface of FIG. 1.
It is a flat II'ii diagram. ■ ...Outer frame 11 ... Spacey-10
... Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] an objective lens that controls drive in seven occassing directions and a tracking direction perpendicular to this with respect to the optical axis; a plate-like spring formed of an elastic material that drives the pair of proboscis lenses in the tracking direction; A spiral leaf spring made of an elastic material that drives the objective lens, a Danover material attached to the outer circumferential surface of the spiral leaf spring, and an integral part of the outer periphery of the Danover material and the spiral leaf spring. 1. A drive device for an objective lens in an optical disc player, characterized in that it is integrally fixed to a cylindrical outer frame.