CN2427867Y - Mechanism for precisely adjusting and fixing laser reading position - Google Patents

Abstract

The utility model relates to a mechanism for precisely adjusting and fixing the position of laser reading heads, which comprises laser reading heads, an optical disk rotating motor, an optical disk tray, a hook-shaped reed fixing screw, a hook-shaped reed, a regulating screw, a sliding shaft, a bottom plate, and a reference point fixing screw, wherein, the bottom plate can be provided with the laser reading heads, the optical disk rotating motor, and the optical disk tray; the bottom plate is provided with a reference convex point and a screw hole; the laser reading heads are arranged on the bottom plate by the sliding shaft which is penetrated, and the sliding shaft is fixed onto the bottom plate by the hook-shaped reed and the screws.

Description

The mechanism that is used for accurately adjusting and fixed laser read head position

The utility model belongs to the used movement field of laser-optical disk technology (comprising CD, CD-R, DVD, DVD-R etc.), is mainly used in accurate location between the movement parts such as CD rotation motor, optical disc tray, laser-optical disk, laser read head, sliding axle and fixing.

The laser-optical disk technology is one of the invention of great significance in information stores and audiovisual field.This technology will need the information of resetting to be stored on the disk that diameter is 120MM (being called laser-optical disk) with the form of pits.Pits is arranged with end to end form, is the center of circle with the center of circle of laser-optical disk, and structure is expanded to the outer ring by inner ring in the shape of a spiral.When laser-optical disk needs playback time, laser read head gives off laser beam, by focusing objective len with laser beam exactly vertical focusing on the pits of laser-optical disk, on pits, produce a diameter at micron-sized flare, this flare carries the information on the pits, after former focusing objective len is caught, receive,, realize playback information by opto-electronic conversion and processing of circuit by receiving trap.In playback procedure, CD rotation motor rotating disc pallet, and drive the laser-optical disk rotation, make the pits of arranging in order on the laser-optical disk pass through flare successively; Simultaneously, laser read head is slowly slided to the outer ring by inner ring on sliding axle according to the helical structure of pits on the CD.Can realize continuous playback like this to information.Because laser read head focussed laser beam and catch flare and realize with same object lens (focusing objective len), and the pits diameter of the diameter of flare and laser-optical disk is all at micron order, to accurately realize the focusing of laser beam on pits, produce diameter at micron-sized flare, and accurately catch flare, the laser beam that needs the information that will read to use keeps the vertical of strictness with the optical disc information face; On the other hand, realize the accurate focusing of laser beam on the optical disc information face, must accurately determine the distance of optical disc information face to focusing objective len, laser read head is finely tuned object lens on this basis, guarantees that the focal plane of object lens overlaps with the optical disc information face.

The structure that realizes said process and requirement with laser read head is called movement, and in the project organization of movement, above-mentioned strict vertical requirement and object lens are converted into to the required distance of optical disc information face:

(1), two sliding axles that will support laser head keep parallel accurately with certain relative position and optical disc tray plane;

(2), accurately determine the distance of sliding axle to the optical disc tray plane;

For realizing two top requirements, the method that adopts in the movement design both at home and abroad has at present:

(1), relies on the precision of component part and accurately installation realization: directly be fixed on sliding axle on the base plate plane, and optical disc tray on being assembled to the CD rotation motor after, the CD rotation motor is directly installed on the base plate plane, guarantees above-mentioned requirement with the precision of part precision and assembling.Owing to relate to a plurality of parts, this method requires all very high to each part precision, also very high to the matching requirements of part.The single part cost is higher, and the qualification rate during production is low;

(2), realize by regulating the optical disc tray plane: directly be fixed on sliding axle on the base plate, and optical disc tray on being assembled to the CD rotation motor after, the CD rotation motor is installed on the base plate plane by governor motion, by adjusting to the CD rotation motor, indirect realization above-mentioned requirements.This method number of spare parts is more, complex structure, and volume is bigger, is unfavorable for design of miniization; And in adjustment process, two above-mentioned requirements have certain correlativity, make the complex process of adjusting:

The purpose of this utility model, provide a kind of structure improved bare headed governor motion, make it by guaranteeing to satisfy aforesaid second requirement with element precision and assembly precision, make sliding axle and optical disc information face keep parallel accurately, satisfy aforesaid first requirement with the method for dynamic adjustments.Make the less influence that is subjected to element precision of performance of product, keep good stability, increase yields.

The utility model comprises laser read head, CD rotation motor, optical disc tray, hook-shaped reed gib screw, hook-shaped reed, adjusts screw, sliding axle, base plate, reference point gib screw, base plate can be settled laser read head, CD rotation motor, optical disc tray, base plate is provided with benchmark salient point, screw hole, the sliding axle that laser read head is interted is placed on the base plate, sliding axle by hook-shaped reed, screw retention on base plate.

On base plate, be provided with precision threaded hole, adjust screw and can freely not have the unoccupied place rotation therein; Adjust screw one end and can make its rotation with instrument, the Z that the other end presses sliding axle to, adjust screw by rotation and can change the Z of sliding axle to height.

Hook-shaped reed one end is fixed on the base plate with hook-shaped reed gib screw, and the Z that the other end is close to the sliding axle end makes progress.Hook-shaped reed has suitable dynamics and elasticity, and an end offers screw, the outside side of the other end, extends a crozier downwards, crozier is close to the sliding axle end face, can be made as sheet, can be provided with broken line in the middle of the hook-shaped reed, make to have crozier one end and tilt upward a little.When adjusting Z that the screw rotation changes sliding axle to height, sliding axle is close to the end face of adjusting screw by the bounce of pressing the hook-shaped reed on it.Base plate, hook-shaped reed, adjust screw and interact, finish jointly to the Z of sliding axle to height control and Y, Z to fixing.

The crozier that hook-shaped reed front end has a stretching, extension to come out, the X that is used for catching on sliding axle be to end face, finishes X to sliding axle to fixing;

Base plate is provided with the benchmark salient point, is used to demarcate the distance of sliding axle to the optical disc tray face.With reference point gib screw 9 wherein one the end in two sliding axles is fixed on the benchmark salient point, finish the accurate location of sliding axle to the optical disc tray plane, the Z that regulates other three ends in the sliding axle again is to height, make two sliding axles and optical disc tray face reach the needed parallel and desired distance of maintenance, it is locked to adjust screw with screw glue afterwards.

The utlity model has following advantage:

(1), can be at the linear Z that adjusts sliding axle of certain scope to height, what make sliding axle and optical disc tray face parallelly reaches very high precision;

(2), adopt the benchmark salient point to demarcate the distance of sliding axle to the optical disc tray face, simple and reliable, the bearing accuracy height;

(3) required distance of sliding axle is separated to handle with parallel requirement, and assembling and adjusting process are simplified.Avoided when above-mentioned two parameters have correlativity the input of production equipment and adjusting process complicated;

(4) adopt Z that two parts (adjusting screw, hook-shaped reed) finish sliding axle to height control and X to fixing,, simple in structure, easy to adjust by sliding axle adjustment shaven head to adapt to motor optical disc tray plane, fixing reliability height;

(5) requirement of reduction part processing reduces production cost;

(6) complexity of reduction structure is simplified technological process;

Accompanying drawing is the utility model structural representation.

As shown in the figure, the utility model comprises laser read head 1, CD rotation motor 2, optical disc tray 3, hook-shaped reed gib screw 4 (selecting 3 for use), hook-shaped reed 5 (selecting 3 for use), adjusts screw 6 (selecting 3 for use), sliding axle 7 (selecting two for use), base plate 8, reference point gib screw 9, base plate 8 can be settled laser read head 1, CD rotation motor 2, optical disc tray 3, base plate 8 is provided with benchmark salient point 10, screw hole 11, laser read head 1 is placed on the base plate 8 by the sliding axle 7 that interts, and sliding axle 7 is fixed on the base plate 8 by hook-shaped reed 5, screw 4.On base plate 8, be provided with precision threaded hole 11, adjust screw 6 and can freely not have the unoccupied place rotation therein; Adjust screw 6 one ends and can make its rotation with instrument, the Z that the other end presses sliding axle 7 to, adjust screw 6 by rotation and can change the Z of sliding axle 7 to height.

Hook-shaped reed 5 one ends are fixed on the base plate 4 with hook-shaped reed gib screw 4, and the Z that the other end is close to sliding axle 7 ends makes progress.Hook-shaped reed 5 has suitable dynamics and elasticity, and an end offers screw 51, the outside side of the other end, extends a crozier 52 downwards, crozier 52 is close to sliding axle 7 end faces, can be made as sheet, can be provided with broken line in the middle of the hook-shaped reed 5, make to have crozier 52 1 ends and tilt upward a little.During to height, sliding axle 7 is close to the end face of adjusting screw 6 by the bounce of pressing the hook-shaped reed 5 on it at the Z that adjusts screw 6 rotations change sliding axles 7.Base plate 8, hook-shaped reed 5, adjust screw 6 and interact, finish jointly to the Z of sliding axle 7 to height control and Y, Z to fixing.

The crozier 52 that hook-shaped reed 5 front ends have a stretching, extension to come out, the X that is used for catching on sliding axle 7 be to end face, finishes X to sliding axle 7 to fixing; Base plate 8 is provided with benchmark salient point 10, is used to demarcate the distance of sliding axle 7 to optical disc tray 3 planes.With reference point gib screw 9 wherein one the end in two sliding axles 7 is fixed on the benchmark salient point 10, finish the accurate location of sliding axle 7 to optical disc tray 3 planes, the Z that regulates other three ends in the sliding axle 7 again is to height, make two sliding axles 7 and optical disc tray 3 planes reach the needed parallel and desired distance of maintenance, it is locked to adjust screw 6 with screw glue afterwards.

When being applied on the DVD player core, as shown in the figure, CD rotation motor 2 usefulness screws (end marks among the figure) are fixed on the base plate 8; Optical disc tray 3 is fixed on the turning axle of CD rotation motor 2; DVD laser read head 1 is fixed on two sliding axles 7 in the mode of wearing axle; On the benchmark salient point 10 on the base plate that wherein one the end usefulness reference point gib screw 9 of two sliding axles 7 is fixed, other three ends are pressed in three precision threaded hole 11 tops on the base plate 8 by an end of three hook-shaped reeds 5 respectively, and just the Z of sliding axle 7 ends upwards; The other end of three hook-shaped reeds 5 is provided with screw hole 51, be fixed on the base plate 8 by three hook-shaped reed gib screws 4 respectively, and guarantee that hook-shaped reed 5 stretches the end face that the crozier 52 that comes out is pushed down sliding axle 7, with the X of fixing sliding axle 7 to; Adjust screw 6 for three and screw in respectively three precision threaded hole 11 of base plate 8 with instrument, and jack-up sliding axle 7 leaves the suitable distance of base plate 8 from the another side of base plate 8.As shown in the figure, rotate three respectively and adjust screw 6, just can change the height of sliding axle 7,, use the locked adjustment screw of screw glue afterwards again, to increase shockproof properties until the requirement that reaches regulation.

The diameter of the pits on the DVD CD is more tiny than VCD, thereby focal beam spot also requires more tiny, in order to realize playback to information on the DVD CD, except in DVD laser read head 1, adopting the shorter laser beam of wavelength and adopt the bigger focusing objective len of numerical aperture, stricter requirement is also arranged in the distance of laser beam to the verticality of CD and focusing objective len to the optical disc information face.The utility model can satisfy this requirement.

Claims (8)

1, a kind of mechanism that is used for accurately adjusting and fixed laser read head position, comprise laser read head, CD rotation motor, optical disc tray, hook-shaped reed gib screw, hook-shaped reed, adjust screw, sliding axle, base plate, reference point gib screw, it is characterized in that base plate can settle laser read head, CD rotation motor, optical disc tray, base plate is provided with benchmark salient point, screw hole, the sliding axle that laser read head is interted is placed on the base plate, sliding axle by hook-shaped reed, screw retention on base plate.

2, the mechanism that is used for accurately adjusting and fixed laser read head position according to claim 1 is characterized in that the CD rotation motor is screwed on base plate, and optical disc tray is fixed on the turning axle of CD rotation motor; Laser read head is fixed on two sliding axles by the mode with empty axle.

3, the mechanism that is used for accurately adjusting and fixed laser read head position according to claim 1, a wherein end of one that it is characterized in that two sliding axles is with on the benchmark salient point on the fixing base plate of reference point gib screw, other three ends are pressed in three precision threaded hole tops on the base plate by an end of three hook-shaped reeds respectively, and just the Z of sliding axle end upwards.

4, the mechanism that is used for accurately adjusting and fixed laser read head position according to claim 1, it is characterized in that adjusting screw and screw in respectively three precision threaded hole of base plate with instrument, and the jack-up sliding axle leaves the suitable distance of base plate from the another side of base plate.

5, the mechanism that is used for accurately adjusting and fixed laser read head position according to claim 1 is characterized in that hook-shaped reed one end is fixed on the base plate with hook-shaped reed gib screw, and the Z that the other end is close to the sliding axle end makes progress.

6, according to claim 1ly be used for accurately regulating and the mechanism of fixed laser read head position, it is characterized in that hook-shaped reed has suitable dynamics and elasticity, an end offers screw, the outside side of the other end, extends a crozier downwards.

7, according to claim 1ly be used for accurately regulating and the mechanism of fixed laser read head position, it is characterized in that to be made as sheet, can be provided with broken line in the middle of the hook-shaped reed, make to have crozier one end and tilt upward a little.

8, according to claim 1ly be used for accurately regulating and the mechanism of fixed laser read head position, it is characterized in that the crozier that the front end of hook-shaped reed stretches out, the X that catches on sliding axle is to end face and be close on it, finishes X to sliding axle to fixing.

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