CN1184247A - Apparatus for measuring degree of inclination of objective lens for optical pickup - Google Patents
Apparatus for measuring degree of inclination of objective lens for optical pickup Download PDFInfo
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- CN1184247A CN1184247A CN96121866A CN96121866A CN1184247A CN 1184247 A CN1184247 A CN 1184247A CN 96121866 A CN96121866 A CN 96121866A CN 96121866 A CN96121866 A CN 96121866A CN 1184247 A CN1184247 A CN 1184247A
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- light
- objective lens
- inclination
- optical pickup
- light source
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Abstract
An apparatus for measuring the degree of inclination of an objective lens for an optical pickup is provided. The apparatus for measuring the degree of inclination of the objective lens includes a light source, a collimator positioned between the light source and the objective lens, for collimating light emitted from the light source, a condensing lens for converting light passed through the collimator on the objective lens, a light receiving element for receiving light passed through the condensing lens after being reflected from the objective lens, and an optical path converting portion positioned along the optical path between the collimator and the condensing lens, for directing part of the lightentering the optical path converting portion from the light source to travel toward the condensing lens and directing the remaining light toward the light receiving element, ......
Description
The present invention relates to a kind of device that is used to measure degree of inclination of objective lens for optical pickup, more particularly, relate to a kind of like this apparatus for measuring degree of inclination of objective lens for optical pickup, the inclination that this device utilizes laser beam and charge-coupled device (CCD) to measure and proofread and correct object lens.
The information that is recorded on the recording medium in CD player (CDP), video CD-ROM drive (VOD) or the LD player (LDP) reads with optical head usually.Optical head comprises: light source; The object lens that the light that light source sent is assembled; With by receiving the photodetector that the light that reflects from optical record medium comes detection of error signals and information signal.
Topworks is according to driving object lens by detected focus error signal of photodetector or tracking error signal.
Because being recorded in the pit of representing signal message on the recording medium or the size of magnetic regions is micron dimension, therefore, be focused at exactly for the light that light source is sent on the position of expectation of recording medium, the light path of the light that object lens must send with respect to light source is positioned properly.
For this reason, when being installed to object lens in the topworks, must accurately control it.In the prior art, measure the degree of tilt of object lens with apparatus for measuring degree of inclination of objective lens for optical pickup, as shown in Figure 1.
Apparatus for measuring degree of inclination of objective lens for optical pickup comprises: light source 1, video screen 3 and catoptron 5.Here, objective lens for optical pickup 10 is installed in the topworks 13 that is used for proofreading and correct according to detected error signal object lens position.Object lens 10 comprise with optical convergence on its focus convex lens part 11 and in the flat mirror part 12 of the measurement degree of inclination of objective lens of convex lens periphery.Apparatus for measuring degree of inclination of objective lens for optical pickup adopts the relevant and collimated laser beam with high emission energy as light source 1.The light beam 2 that light source 1 sends incides on the flat mirror part 12 of object lens.Here, if the light path of the light 2 that the central axes of object lens 10 is sent in light source 1 then incides the light that reflects on the light path of the light 2 on the flat mirror part 12 and the flat mirror part 12 and coincides.If but the direct of travel of the light beam 2 that object lens 10 relative light sources 1 send do not collimate, so, then be different from the light path of incident beam 2 by the light path of flat mirror part 12 beam reflected 4 of object lens 10.
The light beam 4 that video screen 3 receiving objectives 10 reflect, the part that receives light above it has different brightness with its peripheral part.Video screen 3 is positioned on the light path, and to absorb flat mirror part 12 beam reflected 4 by object lens 10, when determining its reference position, the light path that make the light that incides flat mirror part 12 is with consistent by the light path of its reflection.
The facula position that forms on the video screen 3 is estimated, and above-mentioned relatively reference position determines that error is whether within allowed band.At this moment, if the error of determining illustrates that then the object lens quality is better in the permissible error scope, otherwise, the object lens inferior quality, and readjust the heeling condition of object lens.
In traditional apparatus for measuring degree of inclination of objective lens for optical pickup, owing to be that the degree of tilt of object lens is estimated, so can produce observational error, and range estimation needs long time.
For addressing the above problem, the purpose of this invention is to provide a kind of apparatus for measuring degree of inclination of objective lens for optical pickup, this device can be measured the degree of tilt of objective lens for optical pickup quickly and accurately.
For achieving the above object, the apparatus for measuring degree of inclination of objective lens for optical pickup that is provided comprises: light source; Collimator between light source and the object lens, the light that this collimator sends in order to collimated light source; In order to will be through the condenser of optical convergence on object lens of collimator; In order to receive by after the object lens reflection through the light receiving element of the light of condenser; And the optical path switching device on the light path between collimator and the condenser, the part photoconduction of injecting this device that this optical path switching device is used for light source is sent is to condenser, and with the remainder photoconduction to light receiving element.Send the different degree of tilt of measuring object lens between the position that shines directly into the light on the light receiving element and the position through injecting the light on the light receiving element after the object lens reflection by detection light source.
Describe the preferred embodiments of the present invention in detail by the reference accompanying drawing, above-mentioned purpose of the present invention and advantage can be clearer.Wherein:
Fig. 1 is the light path synoptic diagram of traditional optical pickup lens apparatus for measuring degree of inclination;
Fig. 2 is the optical texture synoptic diagram of apparatus for measuring degree of inclination of objective lens for optical pickup according to a preferred embodiment of the invention; With
Fig. 3 is the optical texture synoptic diagram of the apparatus for measuring degree of inclination of objective lens for optical pickup of another preferred embodiment according to the present invention.
Please referring to Fig. 2, apparatus for measuring degree of inclination of objective lens for optical pickup according to a preferred embodiment of the invention comprises: light source 21, collimator 23, condenser 33, light receiving element 35 and optical path switching device 30.
Optical path switching device is by transmission and be reflected into the conversion that irradiating light beam is finished propagation path.That is, a part of light beam that goes out autocollimator 23 is propagated to light receiving element 35, and the remainder light beam is propagated to object lens 10.
In addition, according to the needs of apparatus for measuring degree of inclination of objective lens for optical pickup optical texture, between collimator 23 and optical path switching device 30, also be provided with catoptron 25.
Objective lens for optical pickup 10 comprises the convex lens part 11 of finishing general function and the flat mirror part 12 of convex lens 11 peripheries.These object lens are by topworks's 13 supportings.
Optical path switching device 30 comprises spectroscope 27 and catoptron 28.Spectroscope 27 is made up of two right-angle prisms, and catoptron 28 is located at spectroscope 27 1 sides.Spectroscope 27 transmission and reflect incident ray on the interphase 27a of two right-angle prisms.Light by interphase 27a reflection is propagated to condenser 33, from the light toward mirror 28 of interphase 27a transmission and all be reflected back toward spectroscope 27, and directive light receiving element 35 after interphase 27a reflection again.
In order to eliminate the influence of different reflectivity that the light that incides the different wave length on the object lens 10 produces, on the light path between condenser 33 and the spectroscope 27, also be provided with a light transmissive light filter 31 that only allows predetermined wavelength to light receiving element 35 detected signals.Light filter 31 also can be made one with condenser 33 by carry out coating to handle in the one side of condenser 33.
On light receiving element 35, the position that is directly incident on the light on the light receiving element 35 by object lens 10 is not the reference position of inciding the position of the light on the light receiving element 35 by object lens 10.In addition, light incide on the flat mirror part 12 of object lens 10 by condenser 33 and by flat mirror part 12 reflections after spectroscope 27 is received by light receiving element 35, the position and the reference position of 35 pairs of light that received of receiving element compare.Light receiving element 35 is charge-coupled device (CCD) preferably.
If the position of the light that is received by light receiving element 35 through objective lens for optical pickup 10 and the difference of reference position are in the permissible error scope, then the degree of tilt of object lens 10 is better, otherwise the degree of tilt of object lens 10 is relatively poor.For estimating the position of the light of determining that light receiving element 35 is received, the light that sends from light source 21 is visible light preferably.
Fig. 3 is the synoptic diagram of explanation according to the apparatus for measuring degree of inclination of objective lens for optical pickup optical texture of another preferred embodiment of the present invention.As shown in Figure 3, apparatus for measuring degree of inclination of objective lens comprises: light source 21, collimator 23, condenser 33, light receiving element 35 and optical path switching device 30, here, the label identical with label among Fig. 2 represented components identical, the Therefore, omited to the detailed description of similar elements.
According to second embodiment, simplified the structure of optical path switching device 30.This optical path switching device 30 comprises spectroscope 27 and catoptron 29.Catoptron 29 wherein is formed on the side of spectroscope 27, becomes an integral body with spectroscope 27, and reflection enters wherein part light through collimator 23.As mentioned above, by spectroscope 27 and catoptron 29 are integrated the structure of having simplified apparatus for measuring degree of inclination of objective lens.So, shortened the length of light path between spectroscope 27 and the catoptron 29, thereby reduced light loss.
The light that light source 21 sends is propagated to light receiving element 35 through spectroscope through a directional light part that becomes behind the collimator 23, and remainder is propagated to object lens 10.Compare with the reference position through the position that the illumination of flat mirror part 12 reflected backs of object lens 10 is mapped on the light receiving element 35, wherein the light that is sent by light source is directly incident on position on the light receiving element as the reference position.Can measure the degree of tilt of object lens 10 relative topworkies 13 by the position of comparing light.
In addition, the light filter 31 described in Fig. 3 described in first embodiment can be arranged on the light path between spectroscope 27 and the condenser 33, perhaps is plated at least one side of condenser 33.
Like this, can measure degree of inclination of objective lens for optical pickup quickly and accurately, and objective lens for optical pickup in the manufacture process is adjusted in that the installation of topworks is improper.
Claims (6)
1, a kind of apparatus for measuring degree of inclination of objective lens for optical pickup comprises:
One light source;
One collimator, it collimates with the light that described light source is sent between described light source and described object lens;
One condenser is used for and will passes through the optical convergence of described collimator to described object lens;
One light receiving element is used to receive by the light of described object lens reflection back by described condenser; With
One optical path switching device, its on the light path between described collimator and the described condenser, with a part of photoconduction that will incide this optical path switching device from described light source to described condenser, and with all the other photoconductions to described light receiving element,
Wherein, by detecting the position that shines directly into the light on the described light receiving element that described light source sends and measuring the degree of tilt of described object lens through shining difference between the position on the described light receiving element after the described object lens reflection.
2, degree of inclination of objective lens for optical pickup pick-up unit as claimed in claim 1 is characterized in that, described optical path switching device comprises:
One spectroscope, it will inject a part of transmittance of optical path switching device, with all the other light reflections; With
One catoptron, it is used for reflection and passes described spectroscopical light near described spectroscope setting.
3, apparatus for measuring degree of inclination of objective lens for optical pickup as claimed in claim 1 is characterized in that, described optical path switching device comprises:
One spectroscope, this spectroscopical side are coated with and are used for a part of reflection of light material that optical path switching device is injected in transmission, and reflect all the other light, and described reflecting material reflects described transmitted light.
4, apparatus for measuring degree of inclination of objective lens for optical pickup as claimed in claim 1 also comprises:
One light filter, described light filter with the visible light part transmission in the light, and stop remainder on the light path between described optical path switching device and the described condenser.
5, apparatus for measuring degree of inclination of objective lens for optical pickup as claimed in claim 4 is characterized in that, described light filter overlays at least one side of described condenser.
6, apparatus for measuring degree of inclination of objective lens for optical pickup as claimed in claim 1 is characterized in that, the light that described light source sends is in limit of visible spectrum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96121866 CN1074533C (en) | 1996-12-06 | 1996-12-06 | Apparatus for measuring degree of inclination of objective lens for optical pickup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96121866 CN1074533C (en) | 1996-12-06 | 1996-12-06 | Apparatus for measuring degree of inclination of objective lens for optical pickup |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1184247A true CN1184247A (en) | 1998-06-10 |
| CN1074533C CN1074533C (en) | 2001-11-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96121866 Expired - Fee Related CN1074533C (en) | 1996-12-06 | 1996-12-06 | Apparatus for measuring degree of inclination of objective lens for optical pickup |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1074533C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100381810C (en) * | 2003-12-19 | 2008-04-16 | 财团法人工业技术研究院 | Fluorometric auxiliary detection device |
| CN100487384C (en) * | 2007-02-02 | 2009-05-13 | 清华大学深圳研究生院 | Optical head tri-dimensional torquer inclined movement characteristic curve test method |
| CN104880700B (en) * | 2015-05-25 | 2017-05-31 | 北京航天发射技术研究所 | One kind collimation control device and method |
| CN107388993A (en) * | 2017-07-31 | 2017-11-24 | 歌尔股份有限公司 | A kind of method and system of two face perpendicularity of test object |
| CN108180865A (en) * | 2017-12-28 | 2018-06-19 | 长春长光精密仪器集团有限公司 | A kind of test device of heavy-calibre planar minute surface shape |
| CN109387163A (en) * | 2018-12-08 | 2019-02-26 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of portable plain shaft parallelism calibration method of heavy caliber |
| CN111272394A (en) * | 2020-02-25 | 2020-06-12 | Oppo广东移动通信有限公司 | Test method and test system |
-
1996
- 1996-12-06 CN CN 96121866 patent/CN1074533C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100381810C (en) * | 2003-12-19 | 2008-04-16 | 财团法人工业技术研究院 | Fluorometric auxiliary detection device |
| CN100487384C (en) * | 2007-02-02 | 2009-05-13 | 清华大学深圳研究生院 | Optical head tri-dimensional torquer inclined movement characteristic curve test method |
| CN104880700B (en) * | 2015-05-25 | 2017-05-31 | 北京航天发射技术研究所 | One kind collimation control device and method |
| CN107388993A (en) * | 2017-07-31 | 2017-11-24 | 歌尔股份有限公司 | A kind of method and system of two face perpendicularity of test object |
| CN108180865A (en) * | 2017-12-28 | 2018-06-19 | 长春长光精密仪器集团有限公司 | A kind of test device of heavy-calibre planar minute surface shape |
| CN109387163A (en) * | 2018-12-08 | 2019-02-26 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of portable plain shaft parallelism calibration method of heavy caliber |
| CN111272394A (en) * | 2020-02-25 | 2020-06-12 | Oppo广东移动通信有限公司 | Test method and test system |
| CN111272394B (en) * | 2020-02-25 | 2022-05-20 | Oppo广东移动通信有限公司 | Test method and test system |
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| Publication number | Publication date |
|---|---|
| CN1074533C (en) | 2001-11-07 |
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Granted publication date: 20011107 Termination date: 20100106 |