CN1003062B - Light device for information write-read - Google Patents

Abstract

The present invention relates to a device for writing and reading on the information plane of a rotary recording disc by an irradiation light spot (5), which comprises a main cast base rack (11) and a driving device for driving the recording disc (3), wherein the recording disc is provided with a spindle (43) supporting in the base rack (11). The device also comprises an optical system with a movable prism system (17) and a prism system driving device (13) with a movable prism rack (15).

Description

Optical devices in order to reading writing information

The present invention is a device that the radiation light point information of carrying out on the information plane that utilizes the rotating disk that the moving axis that rotates rotates is write-read.This device is made up of following part: the total pedestal of casting; Device of rotation driving with one around the dish of the axle of rotating shaft rotation, an optical system, this system has a prism system, this prism system can be done parallel moving with respect to above-mentioned information plane, also have an optic axis and prism system drive unit, this prism system drive unit in this optical system, have the prism carriage and the prism carrier support means that link with optical system.

A device like this can 537(PHNG807) be learnt from European patent application EP 45.In the device of this european patent application, a video recorder and a motor are fixed in the system with casting pedestal.The shell of motor fixedly is loaded on the axle of core and the supporting bable tops of video recorder.In this respect can be with reference to european patent application 30,754(PHN9648), in this piece patent, the support of axle is clearly visible.In such device, axle is very important with respect to the accurate location of prism carriage mobile route.Particularly, must guarantee the axle optic axis of parallelogram prism system strictly, to guarantee to learn the information plane of optical axis perpendicular to video recorder, differ information to avoid occurring intelligent shape, when the intelligent shape of appearance differs information, radiation light point has been amplified greatly, and the juxtaposition of adjacent track especially may take place.

In known devices, the accurate aligning of axle (Spindle) and location are to utilize a mating surface on total pedestal to reach by one.Shell with motor of corresponding accurate finished mating surface is fixed on the mating surface of total pedestal.The arrangement of bearing in motor casing and the precision of bearing itself are depended in the further location of axle (Spindle).The final deviation of axle position is that the error sum by the foozle of each mating surface and relevant parts is determined.The shortcoming of the structure of this known devices is that the error source of decision final error is too many, thereby requires various parts all will satisfy the accuracy requirement of extra high costliness.

The device that the objective of the invention is to improve the above-mentioned type can be simple and inexpensive in the hope of the location of axle.

For this purpose, characteristics of the present invention are that axle is supported on the bearing of casting pedestal.

In using device of the present invention, finish in the bearing of pedestal fully the collimation of axle and location.Present casting technique and getable resin, the particularly thermosetting phenolic resin that strengthens with glass fibre can be made the very accurate product of overall dimensions and need not aftertreatment.In the manufacture process of the pedestal of apparatus of the present invention, the base member that comprises spindle bearing is processed in a casting die.May load onto the bearing or the bearing holder (housing, cover) of one or several suitable bearing material on base member, as bearing bronzes, axle just is contained in bearing or the lining.With respect to known devices, the advantage of this device is that error source reduces, and processes simple, cheap.

The characteristics that have the embodiment of superiority according to the device of this invention are that bearing is made up of the cylindrical inner wall on the total pedestal of casting at least.

In this device, after pedestal was cast, axle can slide into without difficulty in the bearing that is made of the column type inwall and go.The bearing that is integrated with pedestal can be sliding bearing or spiral flute type bearing.In this embodiment, the final error of axle position determines by two mismachining tolerances, that is: the scale error of cylindrical inner wall part and the scale error of axle itself.Thereby can reach high-precision low cost.

Its axle be exactly the characteristics of embodiment of the axle of motor be that the casting pedestal has constituted the part of motor housing at least.Because axle is moved as motor drive shaft again, axle is contained in again in the pedestal, so motor case has no longer worked.In this embodiment, the shielding action of motor case has been finished by pedestal, and this structure was not only wondrous but also reduced cost.

The present invention will describe by means of accompanying drawing comprehensively.

Fig. 1 has partly showed embodiment according to device of the present invention with profile type with schematic form.

Fig. 2 is the planimetric map of the casting pedestal of Fig. 1 device.

Fig. 3 is the longitudinal section along III-III line of Fig. 2.

Fig. 4 is along the cut-open view of IV-IV line among Fig. 2.

Fig. 5 is the cut-open view of the casting pedestal of an alternative embodiment of the invention.

Device from Fig. 1 to Fig. 4 is to be used for reading the indicator 3 that rotates around rotating shaft 1 by means of radiation light point 5.Indicator 3 is made up of a transparent substrates, and the end face of substrate has information plane 9, information plane 9 be reflected the layer hide.Record can be the photo-acoustic sound record, light videograph or optical data recording.

This device comprises the pedestal 11 and the prism system drive unit 13 of an overall cast molding.Prism system drive unit 13 can move with respect to pedestal.Prism system drive unit 13 contains a movable prism carriage 15, and the prism system 17 that has on the prism carriage can move with respect to the plane of indicator 3.The straight guide of prism drive unit 13 is made up of two parallel bars 19, an only visible bar on Fig. 1.Said bar is fixed on the mating surface 21 of pedestal 11.Prism drive unit 13 also has a sliding bearing 23, and by this bearing, device 13 can move along two bars.In order to drive prism system drive unit 13, framework 11 has two pairs of projections 24 and 26 again, and magnet is housed on it, can with device 13 drive coil (not drawing on the figure) teamwork.Framework 11 also has two bracket- shaped grooves 28 and 30, and the prism carriage 15 that be used to place ferromagnetic tape, has a controller coil (not drawing on the figure) is contained in two leaf springs 2 and 27 on the top margin of prism system drive unit and base.The two ends of spring are connected to respectively on prism carriage 15 and the prism system drive unit 13 with screw.Prism carriage 15 and prism system 17 can be done limited moving on optical axis 25 directions of prism system 17.By servocontrol, prism system 17 can be followed indicator 3 along optical axis 25 with radiation light point 5 and be moved.Radiation light point 5 is to be formed by the light beam from radiation source 29.For further describing prism drive system and prism system, can be with reference to Netherlands patent applications 8204366(PHN10,513).

Radiation laser beam 28 is to send from the optical system 31 of static state.System 31 has a housing 33, and housing 33 is installed on the mating surface 35 of framework 11 exactly.For the location of static system 31, must be on any position of device 13 mobile routes, with respect to prism system drive unit 13 strict location.System 31 can be with carriage (not illustrating) and screw retention in the hole 37 of framework 11.

Optical system 31 can constitute with multiple mode.Optical system comprises the above-mentioned at least radiation source of having mentioned 29, semiconductor laser radiation source for example, semitransparent mirror 30 and photosensitive semiconductor diode system 32.It is electrical modulation that the photosensitive semiconductor diode is used for the radiation laser beam modulation conversion.Structure for the optical system that optical modulation is converted to electrical modulation can be with reference to relevant document with work.

Pedestal 11 can be used as suitably material cast molding such as lead or thermoset synthetic resin, pedestal 11 is opening basin shape, 11A and four limit wall 11B at the bottom of having one, two walls in four limit walls provide mating surface 21 for bar 19, on the straight wall 11A1 of end 11A, provide mating surface 35 for optical system 31, mating surface 35 is made up of two flat part 35A and 35B, and these two parts have constituted V font supporting surface.

Device among the present invention also has driving mechanism 41, is used to rotate activation record dish 3.Drive unit 41 has axle 43, can 1 rotate around the shaft.On axle 1, fixing the turntable 45 that supports indicator 3.Axle 43 is installed on the pedestal 11.11A has a column part 11A2 at the bottom of the pedestal for this reason, and this part contains bearing, and in the present embodiment, bearing is made up of two bronze plain bearings 47 and 49, and this bearing shell tightly is clipped in the right cylinder 11A2.Importantly guarantee two bearing shells each other on a line, and will accurately locate with respect to prism drive system 13.According to the present invention, can be easy to reach above-mentioned requirements, only need that bearing shell 47 and 49 is slipped into groove 50 and 52 and get final product, these grooves have been able to correct positioning and have had accurate dimensions in casting cycle.Certainly, as a kind of fact, these two kinds of bearing shells can be by a replacement.

In this embodiment, axle 43 is in addition also as a motor shaft, and rotor 51 is fixed on this axle.Rotor 51 has a cylindrical magnet 53, and it matches with stator 55 on being fixed on pedestal 11.Rotor 51 and stator 55 are formed the part of electric system 57.The end 11A of pedestal 11 processes a cavity 59, is used to hold electric system 57.And around the part 11A3 of cavity 59 as the motor shell.Motor shell 11A3 is covered with by lid 61, and lid 61 can be fixed at the end 11.Lid on the end 11 is supporting the thrust bearing of axle 43 again.Lid 61 is equipped with the line bag 65 of tech-generator, and matches and work with the magnet that tests the speed of rotor 53.

In this embodiment, optical recording 3 is closed in 71 li in the box that is represented by dotted lines.Box also is contained on the device, for this purpose, has two locating convex blocks 73 on the pedestal 11, and each all has a sharp free end 75, can cooperate the opening of CD bag or use other forms of the present invention, and CD bag is contained on the locating surface of projection 73.

Fig. 5 represents to have the embodiment that casts pedestal 81, and it comprises end 81A and the straight wall 81B in limit, and their effect is similar to above-mentioned pedestal 11.Pedestal 81 comprises a column part 81A2, and it has cylindrical wall part 83, in rotating shaft 87 is arranged, it can rotate to drive optical recording around axle 85, cylinder barrel 83 is very smooth, for rotating shaft 87 provides a sliding bearing.If desired.Cylindrical wall can have fish-bone pattern, so that provide a spiral corrugated bearing for rotating shaft 87.

Rotatable main shaft 87 can be a motor shaft, in this case, the bearing that cylindrical wall part 83 is become is again the bearing of motor assembly rotor simultaneously, (not expressing), as another alternative plan, main shaft 87 can with a combined with transmission, as have the cable traction device of electric machine assembly.

In fact, except that the version shown in the figure, other array configuration also is possible.

Claims (5)

1, the optical devices in order to Writing/Reading information on indicator, this device comprise-the total pedestal of the body of casting of injection molding or punch die; A rotating driving device that includes a motor and axle is in order to make indicator rotate around axle when optical devices are worked; An optical system that has prism system and optical axis, prism system wherein can be parallel to disc plane and move; With the drive unit of a prism system, this drive unit is fixed in guiding device on the pedestal and supports and a movable prism carriage arranged; Its characteristics are: said axle is on the bearing that is placed on total pedestal cast in block, and said bearing is that the cylinder wall in the hole on said total pedestal is formed.

2, the optical devices according to claim 1, its characteristics are that said cylinder wall and said total pedestal form one.

3, the optical devices according to claim 1 or 2 is characterized in that, constitute said motor shaft in order to the axle of rotating indicator.

4, the optical devices according to claim 1 or 2 is characterized in that, the casting pedestal is the part of the shell of motor at least.

5, the optical devices according to claim 3 is characterized in that, the casting pedestal is the part of the shell of motor at least.

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