CN1324071A - Mechanism for adjusting tilt of optical-sensor for disc player - Google Patents

Abstract

A pickup tilt adjusting (skew adjusting) mechanism for a disk player, where guide shafts 20 and 21 of the pickup 18 are guided by guide blocks 37 and 38 at right angles to a disk player deck 14 while one of both ends is supported by a bearing block 36 in a free movement state. A spiral oblique cam 40 is engaged with end parts of the guide shafts 20 and 21 inside the guide blocks 37 and 38 and the guide shafts 20 and 21 are pressed against the spiral oblique surface 42 by leg parts 44a, 46a, and 46b of torsional coil springs 44 and 46. As the spiral oblique cam 40 is rotated, the guide shafts 20 and 21 have their end parts move up and down at right angles to the disk playe deck 14 to have their tilts adjusted. The invention can finely adjust a tilt error of a pickup to a disk, and maintain the adjusted state reliably.

Description

The mechanism for adjusting tilt of optical-sensor of disc player

The present invention relates to make the mobile route of optical flame detector and the governor motion of disc player disc surfaces of revolution keeping parallelism, relate in particular to tilt adjustment (skew adjusting) mechanism that regulates of inclination the axle of direct light sensor.

Traditional from the disc player of Mini Disc (CD), laser disc (LD), digital video disc (DVD), miniature disc optical record medium sense informations such as (MD), optical flame detector must keep the laser beam state vertical with the recording track face in the moving process that the record surface to disc scans.

The action of general disc player is as follows, the rotation of drive motor makes thread spindle rotation by the belt transmission, and the optical flame detector that combines with this thread spindle screw thread slides on a pair of leading axle, moves along the radial direction straight line of disc, the disc record track plane that is rotating is scanned sense information.

At this moment, the laser beam that penetrates from optical flame detector must be vertically to shine on the recording track face.Yet, between optical flame detector and disc, can produce mechanical the relative position error usually, this error can cause optical flame detector errors such as focusing error, droop error to produce.

For this reason, give from normal moveout correction with focus servo mechanism and tracking servo etc.Yet if the assembly precision of the leading axle of supporting, direct light sensor is relatively poor, or leading axle is fixed on the player panel (deck) with exceeding above-mentioned correcting range in assembling process, and these servo control mechanisms just can't be proofreaied and correct.

For this reason, shown in No. 2793175 communique of Jap.P. and No. 2793176 communique of Jap.P., invent a kind of adjustment for angle of inclination of optical flame detector, be used to make laser beam vertically to shine the recording track face.These traditional disc players are that a pair of leading axle that will support turntable and optical flame detector is arranged on the player panel, and in the side of optical flame detector formative gear portion, mesh with the thread spindle that driven by drive motor.

The tilt adjustment device of putting down in writing in No. 2793175 communique of this Jap.P. is that the annular groove that is provided with to tilt to the periphery of cylinder is to form druum cam, and the free end of the optical flame detector guide rail that an end pivot is propped up embeds in the annular groove of above-mentioned druum cam, rotation by above-mentioned druum cam makes the relative player panel of rail end and vertically, regulates the inclination of guide rail thus.

Yet,, need reserve the space that druum cam mechanism is set in the outside, two ends on rail axis, so be unfavorable for dwindling the player panel length of guide rail bearing of trend in this occasion.

Have again, because above-mentioned druum cam mechanism finishes moving range from the lowest point to the summit with the half-turn rotation, so used range of adjustment is compressed in half of external diameter of druum cam, make the degree of tilt of cam become precipitous, and because of druum cam mechanism just regulates an end of guide rail, so regulate the half cycle that the moving range of usefulness is a druum cam.

If in order to make above-mentioned condition sufficient and increase the cam degree of tilt, then can cause the druum cam backwards rotation because of the external force that external factor such as vibration impose on guide rail.Thereby be difficult to guarantee original adjusting position.

And rail end will make druum cam rotate with two wall supportings of druum cam groove, will leave certain interval between rail end and cam path wall.On the other hand, disc player not necessarily uses under identical posture, and different use postures can make adjusting position change in this interstice coverage.

In addition, No. 2793176 communique of Jap.P. be the end face with screw support an end be fixed into the shape that rolls freely, at the other end with the leading axle opposite one side of elastic component from the afterburning optical flame detector of one side, and with the rotation of screw change with scroll end between relative support height, make tilt adjustment thus.

Yet the length of screw hole is subjected to the restriction of player plate thickness, can not obtain enough length and come the screw of screw thread combination is with it brought into play the rotary resistance that is formed by friction.Thereby, might make it lax because of external force such as vibrations, can not keep adjusting position reliably.

For this reason, the objective of the invention is to overcome the problems referred to above, provide a kind of optical flame detector of accurately regulating the droop error of player panel, optical flame detector tilt adjustment (skew adjusting) mechanism that also can keep the disc player of this state reliably.

To achieve these goals, the mechanism for adjusting tilt of optical-sensor of disc player of the present invention is provided with 2 supports and leading axle adjustment means, aforementioned 2 supports to the supporting optical flame detector, make it movably that leading axle supports near two ends, aforementioned leading axle adjustment means has the helical ramp cam of the cylindrical outer sliding contact of common end and leading axle between these 2 supports, the pass between the diameter D of aforementioned leading axle adjustment means and the spacing A of aforementioned 2 supports is π D＜A.

The present invention can inlay aforementioned leading axle adjustment means outward that (ァ ゥ ト サ-ト) also can be provided with the angle block on aforementioned leading axle adjustment means on the player panel, prevent that this is more than leading axle adjustment means rotation 1 circle.In addition, horizontal level mark in the design also can be set on aforementioned leading axle adjustment means and aforementioned playout machine side plate.

Simple declaration to accompanying drawing

Fig. 1 is the vertical view of seeing from the side of a disc player that adopts mechanism for adjusting tilt of optical-sensor one embodiment of disc player of the present invention.

Fig. 2 is the back view of Fig. 1.

Fig. 3 is the side view along 3-3 line among Fig. 2.

Fig. 4 is the stereographic map of relation of leading axle end, helical ramp cam and bootstrap block on the mechanism for adjusting tilt of optical-sensor of explanation disc player of the present invention.

Example below in conjunction with the mechanism for adjusting tilt of optical-sensor of description of drawings disc player of the present invention.

Fig. 1 is the vertical view that expression has disc player 12 1 embodiment of mechanism for adjusting tilt of optical-sensor 10 of the present invention, and Fig. 2 is the back view of Fig. 1, and Fig. 3 is the side view along 3-3 line among Fig. 2.Among the figure same member is used same-sign.

The 14th, the player panel of disc player 12 is shaped by pressing metal plates, and configuration is equipped with turntable 16 on the disk motors 15 in left side in the drawings, and is chimeric and disc is rotated for the center pit and the installation shaft 16a of disc (not shown).On the radius of the right side of turntable 16, be equipped with optical flame detector 18, the optical unit 17 that contains light source is housed on it.Optical flame detector 18 is slided freely by a pair of leading axle 20,21 supportings in the back side of player panel 14 (see figure 2).Leading axle 20,21 bootable optical flame detectors 18 move as straight line along turntable 16 or not shown disc radius.

On optical flame detector 18, be provided with the tooth bar 22 parallel, with the pinion interlock with leading axle 20,21.Fixing gear wheel 26 coaxially with pinion wheel 24, rotating with pinion wheel 24 one.Gear wheel 26 is connected with driven wheel 34 through intermediate reduction gear gear 28,30 and is driven, and this driven wheel 34 directly is connected with the driving shaft of feeding motor 32.

Feeding motor 32 is through such gear set 34,28,30,26, and by pinion wheel 24 and tooth bar 22 optical flame detector 18 made linear drives.The driving mechanism that is formed by pinion wheel 24 and tooth bar 22 has degree of freedom in the direction along the flank of tooth vertical with moving direction, so pinion wheel 24 can not hinder the axis of leading axle 20,21 relative leading axles 20,21 with the engagement of tooth bar 22 and operate to the adjusting of vertical direction.

The back side at player panel 14 shown in Figure 2, support as leading axle 20,21, be shaped by outer edge across player panel 14, form with player panel 14 by 1 drive tab 36 of holder 54 all-in-one-pieces and 3 bootstrap blocks 37,38 on the face of disc one side.An end 20a who optical flame detector 18 is made the 1st leading axle 20 of straight line guiding is made into sphere, by be formed at player panel 14 certain positions on drive tab 36 between sphere is connected, it is restricted the mobile of axis direction, but unsteady freely.

The other end of first leading axle 20 is subjected to the supporting of the 1st bootstrap block 37 of formation on player panel 14, it is prevented to the displacement in the axis direction outside and with the displacement of player panel 14 parallel directions, but can do moving of vertical direction relative to player panel face 14, and can hang down frictionally and only slide freely along the protruding 37a of the vertical guide of first leading axle 37 that supports leading axle 20 two sides with minimum area in vertical direction.In addition, first bootstrap block 37 moves axially because of leading axle 20 has been limited by drive tab 36, thus only limit radial shift, and axially opening wide.

Another straight line guiding elements of optical flame detector 18, the i.e. two ends of second leading axle 21 second bootstrap block, 38 supportings that are subjected on player panel 14 forming, guide respectively its can only with the face vertical direction displacement of player panel 14.That is, as shown in Figure 4, second bootstrap block 38 is also same with first bootstrap block 37, utilizes with the vertical guide projection 38a of minimum area contact from two-side supporting second leading axle 21, to make it to slide freely in vertical direction.In addition, second bootstrap block, 38 usefulness wall 38b have sealed the outside of second leading axle, 21 resettlement sections, limit second leading axle 21 in axial displacement.

Architectural feature of the present invention is, the end, 3 place of supporting leading axle 20,21 with 14 of the player panels of bootstrap block 37,38 inboards of limiting its moving direction on, promptly, between drive tab 36 and the bootstrap block 37 and between 2 bootstrap blocks 38, be shaped by outer edge, the helical ramp cam 40 as the leading axle adjustment means can be rotated freely integratedly with the flange 48 by on the face of disc one side that is positioned at player panel 14 across tabular player panel 14.Helical ramp cam 40 is embraced leading axle 20,21 from the side in the shaft end inboard, and the helical ramp cam 40 of supporting leading axle 20,21 is located on the axial vane surface of rotatable columnar portion, between the periphery circular diameter D of this columnar portion and 2 the helical ramp cams 40, be exactly that the pass of the spacing A between the axle center is: A＞π D specifically, leading axle 20,21 is supported on the helical ramp 42 with stable position relation, can realizes regulating reliably.

And the end of the leading axle 20,21 that cooperates with helical ramp cam 40 is turned round a pin 44a of volute spring 44 respectively and is turned round two pin 46a, 46b of volute spring 46 afterburning and flexibly be pressed on (see figure 3) on the helical ramp 42.Another pin 44b that is turned round volute spring 44 then blocks and can not rotate with the protruding 14c that is located at 14 1 ones of player panels.

Spiral part 44c, the 46c that is turned round volute spring 44,46 is bearing on protruding 14a, the 14b that is convexly set on the player panel 14, all the time flexibly be pressed in leading axle 20,21 on the helical ramp 42, so no matter which kind of posture disc player is in, all can keep the sliding contact state between leading axle 20,21 and the helical ramp 42, and can between them, not form the gap.Thereby, rotate by making helical ramp 40, can make leading axle 20,21 relative player panel 14 and free to deflect vertically under snap portions and state that helical ramp 42 is connected airtight.Thereby, the inclination that can proofread and correct 18 pairs of discs of optical flame detector linkedly with the displacement of leading axle 20,21.

Fig. 4 is the side view of the relation of expression helical ramp cam 40 and second bootstrap block 38 and leading axle 20,21.From the two sides of player panel 14, be shaped by outer edge, be configured as the state that helical ramp cam 40 and the flange 48 of opposite one side together clip player panel 14, with the axial region 50 (see figure 3)s connection of perforation player panel 14.Thereby using the helical ramp cam 40 and the flange 48 of the axial end formation of columnar portion can axial region 50 be the rotation of center one.On the hub portion 41 that the central authorities of helical ramp cam 40 protrude, form the holding section that usefulness is regulated in rotation, for example form be applicable to hexagon socket head cap screw with spanner, there are the recess 41a of hexagonal inwall in central authorities, the rotating operation of the helical ramp cam 40 of the inclination of adjusting leading axle 20,21 can be undertaken by the spanner that is suitable for recess 41a.

In addition, helical ramp cam 40 is indexed to apart from player panel 14 the top 42U farthest from being positioned near player panel 14 42L bottom along helical ramp 42 in order to make leading axle 20,21, needs rotation 1 circle.Therefore have, leading axle 21 can be regulated its inclination at two ends again, and in this occasion, each helical ramp cam 40 is shared half of required moving range, can make at the gradient of the shift motion of leading axle 21 milder.

Adopt the structure of this mild gradient, can not cause helical ramp 40 retrograde rotations because of the external force that acts on the leading axle 20,21.Thereby, leading axle 20,21 flexibly is pressed on the helical ramp 42 because of the reinforcing of being turned round volute spring 44,46, though because of the rotation of helical ramp cam 40 can be at player panel 14 in the vertical direction displacement, but since with the interoperation of being turned round volute spring 44,46, stop helical ramp cam 40 to rotate with friction, stably keep predefined relative position, can not destroy the mutual position relation in back of regulating because of unexpected external force effect.

In case the continuous helical ramp rotation 1 circle back from 42L bottom along barrel surface of helical ramp cam 40 its helical ramp 42 arrives 42U topmost, just become and the same phase place of 42L bottom, and produce ladder 42S, form discrete state.Be included in the range of adjustment for fear of this discontinuous ladder 42S, as shown in Figure 1, be shaped and form the holder 54 of one overleaf with bootstrap block 38 across the outer edge of player panel 14, the limiting wall 56 that stretches out from this holder 54 as the angle block, the projection 52 that is located on the flange 48 with helical ramp cam 40 unitary rotation is carried out limit rotation, stop the rotation of helical ramp 40 to reach a circle thus.In addition, the 57th, the synthetic resin that the surface and the back side at player panel 14 are formed is communicated with to form the through hole (see figure 2) of one.

And for example shown in Figure 1, with the flange 48 of helical ramp cam 40 unitary rotation on, convex with sign 58, the reference point 60 that itself and player panel 14 surfaces are carved aligns, and at the roughly intermediate settings scale of the range of adjustment of helical ramp 40, as the horizontal level in leading axle 20,21 designs, can behind this scale of range estimation, regulate by the fine motion of above-below direction.In addition, the 62nd, the through hole of perforation flange 48 and player panel 14 when regulating with not shown self-checking device, utilizes the light that sees through to judge the centre position, rotates adjustable screw shape surface cam 40 as benchmark.

Adopt said structure, reverse vertical moving can not take place in same sense of rotation as druum cam.And, owing to do not have the gap between leading axle 20,21 and the spiral fashion cam surface 40,, can regulate reliably rapidly so do not have the dead band when regulating.

As mentioned above, as the helical ramp cam 40 of leading axle adjustment means, its helical ramp 42 is opened wide.Thereby, can be as the drive tab 36 of the supporting member of leading axle 20,21 and the holder 54 of bootstrap block 37,38 reverse side, be shaped and constitute one by outer edge with flange 48 across player panel 14.Certainly, the invention is not restricted to the foregoing description, also can do various distortion and combination.

As mentioned above, adopt the mechanism for adjusting tilt of optical-sensor of disc player of the present invention, the helical ramp cam is not provided in a side of the axial end portion of leading axle, and is provided in a side of its side, can shorten the player panel length thus, makes whole disc player miniaturization.

In addition, be π D＜A by making auxiliary section diameter D between helical ramp cam and the leading axle and the pass of supporting spacing A, can improve the precision of the leading axle displacement linearity relative thus with the anglec of rotation of helical ramp cam.

In addition, if the helical ramp cam is limited its rotation in advance, when highly regulating, just can avoid useless operation.If utilize outer edge shaping that the component forming on player panel two sides is one, can reduce number of spare parts, improve assembly precision.

In addition, if with the flange of helical ramp cam unitary rotation on sign is set, on the player panel, reference point is set, make the original state (reference position of standard) can be visual, then after adjusting, during for example because of the bad grade of optical flame detector renewal part, can realize the utilization again of player panel.

In addition, if on above-mentioned optical flame detector, set tooth bar, and utilize motor to make pinion wheel rotation with the engagement of above-mentioned tooth bar, above-mentioned optical flame detector is moved, then the driving mechanism of reason pinion wheel and tooth bar formation has degree of freedom in the flank of tooth direction perpendicular to moving direction, so the engagement of pinion wheel and tooth bar can not hinder the adjusting operation of leading axle in vertical direction.

Claims (7)

1. the mechanism for adjusting tilt of optical-sensor of a disc player is characterized in that, is provided with: support optical flame detector, make it movably a pair of leading axle; Near 2 supports of this leading axle of supporting two ends; The leading axle adjustment means has the helical ramp cam of the cylindrical outer sliding contact of turning axle and described leading axle quadrature, its end face and described leading axle between these 2 supports; The player panel that this leading axle adjustment means and described support are supported,

Pass between the diameter D of described leading axle adjustment means and the spacing A of described 2 supports is π D＜A.

2. the mechanism for adjusting tilt of optical-sensor of disc player according to claim 1 is characterized in that, described leading axle governor motion is set in outward on the described player panel.

3. the mechanism for adjusting tilt of optical-sensor of disc player according to claim 2, it is characterized in that, described leading axle adjustment means has the flange that connects with the axial region that connects described player panel, described helical ramp cam and flange can axial region be the rotation of center one, with the axial vane surface of the columnar portion of described axial region one on form described helical ramp cam.

4. the mechanism for adjusting tilt of optical-sensor of disc player according to claim 3 is characterized in that, forms the holding section of adjusting rotation usefulness in the central authorities of described helical ramp cam.

5. according to the mechanism for adjusting tilt of optical-sensor of each described disc player of claim 1～4, it is characterized in that, on described leading axle adjustment means, be provided with the angle block, to prevent that this is more than leading axle adjustment means rotation 1 circle.

6. according to the mechanism for adjusting tilt of optical-sensor of each described disc player of claim 1～5, it is characterized in that, on described leading axle adjustment means and described player panel, be provided with the horizontal level mark in the design.

7. the mechanism for adjusting tilt of optical-sensor of disc player according to claim 1, it is characterized in that, on described optical flame detector, be provided with tooth bar abreast with described leading axle, utilize motor to make pinion wheel rotation with the engagement of described tooth bar, described optical flame detector is moved.

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