CN1755812A - Evaluation device of optical system - Google Patents
Evaluation device of optical system Download PDFInfo
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- CN1755812A CN1755812A CNA2005100819697A CN200510081969A CN1755812A CN 1755812 A CN1755812 A CN 1755812A CN A2005100819697 A CNA2005100819697 A CN A2005100819697A CN 200510081969 A CN200510081969 A CN 200510081969A CN 1755812 A CN1755812 A CN 1755812A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 136
- 238000011156 evaluation Methods 0.000 title claims abstract description 36
- 238000001514 detection method Methods 0.000 claims description 26
- 230000005484 gravity Effects 0.000 claims description 22
- 230000006870 function Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 2
- 230000005055 memory storage Effects 0.000 claims 2
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 9
- 230000004044 response Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/34—Indicating arrangements
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
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Abstract
The invention provides an optical-system evaluation device which reduces the vibration sensitivity. The optical-axle evaluation device (A) of the optical system (1) comprises a display (8) with a display area, and a projection image capture device (3) which can display the image time projecting the optical system (1) on a datum plane. The projection image capture device (3) comprises an optical detector (5) which can photograph the image which the optical system projects on the datum plane, and a capture controller (7) which can display the photographed image at the place of the datum plane on the display area. The capture controller (7) comprises a positioning component (70) which can receive low-range photographed images and which can make the optical system relatively adjust the positioning opposite to the optical detector (5). The positioning component (70) can position the projected images in a special area on a first detecting area. The capture controller (7) also comprises a projected image swinging controller (76) which can receive high-range photographed images and which can display the projected images at the place of the datum plane of the display area of the display (8) to restrain the projected images from swinging on the display area.
Description
Technical field
The present invention relates to the evaluating apparatus or the adjusting gear of light picker that CD or DVD use and so on optical system, specially refer to the evaluation or the adjustment of the gradient of the vibration-proof structure of this kind device and optical axis.
Background technology
So far, CD or DVD are amplified demonstration with the optical axis evaluating apparatus or the adjusting gear of the optical system of light picker by the light beam spot image that the light beam with light picker produces, and adjust the gradient of light picker objective lens optical axis.The existing optical axis evaluation/adjusting gear of this class, in order to improve the magnification of light beam spot image, it is designed to external environment condition is estimated/vibration suppression of adjusting gear uses under certain limit.Therefore, in order to use this class optical axis evaluation/adjusting gear, need take evaluation/adjusting gear is arranged at sufficient vibration protection on the vibrationproof platform.
But vibrationproof platform price general charged is high, and along with the raising of vibrationproof performance, price also uprises.So just make and comprise that the equipment set price of optical axis evaluation/adjusting gear raises up.In addition, the device of this existing optical axis evaluation/adjusting gear itself is to the vibration sensing of outside, simultaneously when adjusting the gradient of light picker object lens, and when the adjustment operation that is used to carry out the object lens gradient, the very big influence of the vibration that can be produced.Sensitivity to this vibration can be forced in the problem of temporarily interrupting the adjustment operation before the end vibration.Other parts in the optical axis evaluation/adjusting gear for example also can produce vibration along with moving of the X/Y platform that is used for Position Tracking (tracking of light beam spot image).This vibration makes adjusts the required time lengthening of operation.
Summary of the invention
The object of the present invention is to provide the evaluating apparatus or the adjusting gear of the optical system that reduces vibration sensitivity.
Another object of the present invention is to provide the evaluating apparatus or the adjusting gear of the system optical axis that reduces vibration sensitivity.
According to a kind of form of the present invention, the optical axis evaluating apparatus of optical system provided by the invention has: base; Basal disc by this base support; Be installed on the X/Y platform on the side in the upside of this basal disc and the downside and this X/Y platform is what to be used for installing as the optical system device of evaluation object thereon; And be installed on the photo-detector on the opposing party in the upside of above-mentioned basal disc and the downside.In addition, optical system evaluation apparatus can also have image processing apparatus, this image processing apparatus can suppress the swing of projection image in the above-mentioned image by handling the image of the above-mentioned photo-detector of surveying from the projection image to the optical system of above-mentioned evaluation object.
According to another kind of form of the present invention, the optical axis evaluating apparatus of optical system provided by the invention comprises: the display with viewing area; To project to projection image's acquisition equipment that picture on the reference field constantly is shown in reference position on the above-mentioned viewing area from optical system.This projection image's acquisition equipment has: to project to the photo-detector that the image on the reference field is made a video recording from optical system; Above-mentioned photographs is shown in the acquisition control device at place, reference position on the above-mentioned viewing area.Above-mentioned photo-detector can comprise: the puppet dish that constitutes the said reference face of the picture that receives the projection on its optical axis of above-mentioned optical system; Has first detector that the projection image on the said reference face is taken place with the shooting of first multiplying power first detecting area of first photographed images; Have above-mentioned projection image so that second detector of second detecting area of second photographed images to take place than the shooting of high second multiplying power of first multiplying power, and this second detector is to make above-mentioned second detecting area corresponding to given zone in above-mentioned first detecting area.Above-mentioned acquisition control device can comprise: receive above-mentioned first photographed images, can make above-mentioned optical system adjust positioning means for positioning, and this locating device can carry out work so that the above-mentioned above-mentioned given zone that is positioned at above-mentioned first detecting area with respect to above-mentioned photo-detector; Receive above-mentioned second photographed images, be shown in the place, reference position of the above-mentioned viewing area of aforementioned display device by image, suppress projection image's swing restraining device that projection image swings in above-mentioned viewing area above-mentioned projection image.Above-mentioned projected image swing restraining device can comprise: projection image's positional detecting device of surveying above-mentioned projection image position in above-mentioned second photographed images; Produce the image section that comprises above-mentioned projection image position in above-mentioned second photographed images, supply with the image acquiring apparatus of aforementioned display device.Above-mentioned projected image positional detecting device can comprise: the storer with a plurality of addresses of getting matrix configuration of the above-mentioned second photographed images data of storage; According to above-mentioned a plurality of addresses and be stored in view data in these addresses, calculate center of gravity calculation device corresponding to the center of gravity address of the center of gravity of above-mentioned projection image, and center of gravity calculation device in view of the above, the center of gravity of above-mentioned projection image is promptly represented above-mentioned projection image position.
According to the present invention, can not need the sort of vibrationproof platform that in the past used, and only need use more succinct vibrationproof platform.So also can reduce the whole cost of optical system evaluation apparatus or adjusting gear.In addition, utilize the present invention, compared with the past, even under big vibration, also can adjust the gradient of optical axis.Therefore, the high Position Tracking ability of the sort of in the past X/Y platform can be do not needed, location tracking and cost degradation can also be simplified.
Description of drawings
Fig. 1 is the block diagram that shows the optical system evaluation apparatus of bright an embodiment of the present invention.
Fig. 2 has adopted the CD of optical system evaluation apparatus one form of implementation of Fig. 1 or the DVD schematic elevational view with the optical axis adjustable device of light picker, and shows bright other electric handling part with block diagram.
Fig. 3 is the side view with portion of mechanism in the optical axis adjustable device of Fig. 2 shown in the cut-away section.
Fig. 4 is the synoptic diagram of the optical system of Fig. 2 and optical detection shown in Figure 3 unit and controlled light picker.
Fig. 5 shows the relation of the detecting area of bright low range ccd video camera and high magnification ccd video camera.
Fig. 6 is the block diagram of electric handling part details that shows the optical axis adjustable device of bright Fig. 2.
Fig. 7 is the block diagram that shows the X/Y positional information generation circuit details of bright Fig. 4.
Fig. 8 is the evaluation of showing the light picker of bright employing optical axis adjustable device, the process flow diagram of adjusting integral body.
Fig. 9 is the more detailed process flow diagram that shows the gradient adjustment process of bright Fig. 8.
Figure 10 is the process flow diagram of remainder that shows the adjustment process of bright Fig. 8.
Figure 11 shows the low range and the powerful light beam spot image of bright ccd video camera.
Figure 12 shows the actual displayed example of the Luminance Distribution of bright X-axis and Y-axis.
Figure 13 is the process flow diagram of the vibration at high speed control flow that shows that light beam spot image shake that bright step S32 by Figure 10 carries out suppresses.
The meaning of each label is as follows among the figure:
1, intend the optical system of estimating; 3, projection image's grabber; 5, photo-detector; 7, the acquisition control device; 8, display.
Embodiment
Below with reference to description of drawings form of implementation of the present invention.
Fig. 1 shows the optical system evaluation apparatus A of bright an embodiment of the present invention.As shown in the figure, this optical system evaluation apparatus A has the optical system that is used for evaluation object, projection image's acquisition equipment 3 that the optical parametric (for example gradient of optical axis) of the optical element (for example object lens) in the optical system of promptly intending adjusting 1 is estimated.Projection image's acquisition equipment 3 has the projection image that is used for the optical system of intending adjusting 1, for example to the light beam spot that light beam became (BS) image through optical element in the optical system, and the photo-detector 5 and the acquisition control device 7 of catching.In addition, optical system evaluation apparatus A also has the display 8 that the place, reference position shows on the viewing area with this projection image that catches.
In detail, photo-detector 5 has the reference field of projection image of receiving optics and first detector 50 and second detector 52 that the projection image on this reference field is made a video recording.First detector 50 has first 2 dimension detecting area, and the projection image on the reference field is made a video recording with low range, produce the low range photographed images, and second detector 52 has second 2 dimension detecting area, takes this projection image with high magnification, produces the high magnification photographed images.Second detecting area of this second detector 52 is the target area corresponding to the sub-district of middle body in first detecting area of first detector 50.Acquisition control device 7 has location division 70 and projection image's rebanking control part 72.Location division 70 can make plan adjustment optical system 1 do relative adjustment with respect to photo-detector 5 and position.For the target area that projection image is positioned on first detecting area has position sensing portion 700 and adjustment part, position 702.Like this, location division 70 is carried out work and is made within the projection image target approach zone when projection image is outside the target area, and when photogra within the target area during will walk out outside this zone the time, then carry out work and make it to stay in the target area.In addition, mobile allow of projection image in the target area.
Projected image waves control part 72, it receives the high magnification photographed images of second detector 52, the image of projection image is shown in the place, reference position of the viewing area of display 8, suppresses the swing of projected image in the viewing area thus, have position sensing portion of projection image 720 and image extraction unit 722.As mentioned above, because location division 70 allows projection image to move in the target area, high magnification photographed images for projection image, when applying vibration for optical system evaluation apparatus A, can see that projected image has big swing, for this reason, the position of projection image in the high magnification photographed images of projection image's position sensing portion 720 detections second detector 52.The image section that comprises this projection image position in the image extraction unit 722 generation high magnification photographed images is supplied with display 8 then.Display 8 suppresses projection image's waving in the viewing area by being shown in from the image section of image extraction unit 722 in the reference position of viewing area.This substantially static visible projection image is with certain adjustment (for example, adjusting the gradient of optical axis) of the optical element of the optical system 1 intending easily adjusting.
The form of implementation of the optical system evaluation apparatus A that adopts Fig. 1 is described below with reference to Fig. 2～Figure 13, and CD or DVD are with the optical axis adjustable device B of light picker.This optical axis adjustable device B is used for adjusting the gradient of the optical axis of set object lens in the light picker.
At first describe the mechanical part of optical axis adjustable device B in detail with reference to figure 2～Fig. 4.Here for Fig. 1 in the corresponding key element of key element diacritic B on same numeral.Fig. 2 is the front elevation of the mechanical part of optical axis adjustable device, also shows the electric handling part of understanding other, and Fig. 3 is the side view that shows portion of bright Fig. 2 mechanism part section, the then general diagrammatic sketch 2 of Fig. 4 and optical detection shown in Figure 3 unit and the light picker of adjusting object.Shown in Fig. 2 and 3, the portion of mechanism of optical axis adjustable device B comprises the supporting device 2B that the pick-up 1B that intend to adjust can be installed and is installed to optical detection unit 5B on the 2B of this mechanism, and the electric handling part of optical axis adjustable device B then comprises the pre-amplifier unit 7B-1 that is installed on the supporting device 2B, the 7B-2 of basic computer portion, the display part 8B, the 9B of remote control portion that are provided with respectively of supporting device 2B therewith.
Describe portion of mechanism below in detail, from Fig. 2 and 3 as can be known, supporting device 2B comprises that horizontally disposed plate is supporting station 200, is installed to two blocks of side plates 202 and 204, backplate 206 on this supporting station 200 and the common basal disc 208 that is supported by these plates.Above-mentioned platform, side plate and basal disc are fixing securely with screw thread etc. mutually.Said mechanism portion comprises optical detection unit 5B that is installed on basal disc 208 upper surfaces and the X/Y platform 220 that is installed on basal disc 208 lower surfaces.Optical detection unit 5B has main part 50 and the downward lens barrel part 55 of main part 50 from then on.In addition.X/Y platform 220 has at the X-axis platform 224 that fixed part is installed on basal disc 208 lower surfaces and is installed in pick-up erecting bed 226 on the movable part lower surface of Y-axis platform 224.Be useful on the installing mechanism of install to intend adjusting pick-up 1B on the installation head 226, this installing mechanism then has horizontally disposed two axles (main shaft and countershaft) 225 in the installation head of being installed to and will insert the fixing spring of usefulness (not shown) of pick-up on these.X/Y platform 220 has the step motor 228,229 (only showing bright among Fig. 3) that the X-axis that is installed on backplate 206 back sides and Y-axis are used, and drives X-axis platform 222 and Y-axis platform 224 whereby respectively.Step motor 228,229 rotary positions according to step motor, by the circular cam 227 (being shown in the top of step motor among Fig. 3) of off-center axle, the amount of movement of control X/Y platform (promptly by press the logical plate 221 that is installed on the X/Y platform to move this with cam).In addition, among the supporting device 2B, the mechanism (not shown) that a pair of gradient adjustment button 230 is done rotatable supporting is installed on the installation head 226.Like this, the front end that each gradient is adjusted button becomes screwdriver, can rotate the counterpart of two screws of the object lens gradient of determining to intend the pick-up 1B that adjusts.
As mentioned above, in portion of mechanism, optical detection unit 5B and X/Y platform 220 are owing to be installed on the common mutually basal disc, with respect to the vibration that receives from ground etc., optical detection unit 5B go up X/Y platform 220 from but and the relative position relation between the pick-up 1B that adjusts of the plan that is mounted thereon, just becoming is along continuous straight runs structure with low uncertainty at least.Also owing to respectively oppose side with what optical detection unit 5B and X/Y platform 220 were arranged at the upper surface of basal disc 208 and lower surface, and can be with basal disc 208 as common intersection point, so can further reduce the relative variation (with respect to external vibration, the variation of the relativeness of optical detection unit 5B and X/Y platform 220 is little) of position relation.Have again, by being installed on the common basal disc, because optical detection unit 5B and X/Y platform 220 are along vertical close the contact.Also make in the vertical direction variation of relative position relation little.
Come again referring to Fig. 4, wherein generally shown the optical system of optical detection unit 5B with the pick-up 1B that intends adjusting.At first, the pick-up 1B of plan adjustment has bottom 10 and object lens supporting station 12.Bottom 10 has gas 100 as generally showing among the figure, comprises laser diode 102, collimation lens 104, catoptron 106 in this main body 100, from above the laser diodes Shu Chaoxiang.Object lens supporting station 12 has main body 120 and is installed on the interior focus actuator 122 of main body, and focus actuator 122 is mounted to object lens 124 are moved along vertical.Object lens 124 are focused in top focal position place by the laser beam of catoptron 106 reception laser diodes 10.This position can be by the focus actuator adjustment.Object lens supporting station 12 is mounted to and can regulates with respect to bottom 10 by two screws 126 and 128.These two screws are that screw is adjusted at the inclination angle, for what know in the corresponding field, can be used for adjusting the gradient of X-direction and Y direction.
Optical detection unit 5B has main body 50 and lens barrel 55 as mentioned above, and lens barrel 55 has stack shell 550, is installed on the puppet dish 552 of its front end, is installed on the object lens 554 in the stack shell 550.The back side of pseudo-dish 552 becomes focal plane.Focal plane 556 constitutes the reference field from the light beam spot projection of the object lens of the pick-up 1B that intends adjusting, and the image of light beam spot in this focal plane (BS) is transformed to directional light by object lens 554.The main body 50 of optical detection unit 5B is used to survey the light beam spot image on the focal plane, has low range ccd video camera 550 and high magnification ccd video camera 520.Low range ccd video camera 500 is two-dimentional imaging apparatuss, by the light beam spot image of semi-transparent reflection mirror 502 line focus lens 504 receptions from object lens 554.Again by semi-transparent reflection mirror 522, line focus lens 524 receive this light beam spot image to focus detection sensor 560 from semi-transparent reflection mirror 502.
Referring now to Fig. 5, the relation of the detecting area of low range ccd video camera 500 and high magnification ccd video camera 520 is described.As shown in the figure, the shooting district of low range ccd video camera 500 is detecting area SA1 (Fig. 5 (a)), and the central portion of this detecting area SA1 then has the target area 7A of zonule.On the other hand, the shooting district of high magnification ccd video camera 520 constitutes detecting area SA2 (Fig. 5 (b)), and this distinguishes corresponding to the little target area TA in the detecting area SA1.The multiplying power ratio of low range CCD and high magnification CCD is as being 20 times, as previously mentioned, and when light beam spot (BS) image P enters in the detecting area SA1, in optical axis adjustable device B, above-mentioned image is shown in " P ' ", for making in its target approach district 7A the position of may command X/Y platform.Thus, in powerful detecting area SA2, just as shown in the figure, for example appear at and be displaced to from the center in direction position down.In addition, there is big waving the position of BS image owing to optical axis adjustable device B vibrates in detecting area SA2.Optical axis adjustable device B of the present invention cuts out a certain size the image section that comprises BS image P ' in the center in the detecting area SA2.Be shown among the viewing area DA (Fig. 5 (c)) of display 8B by the image section that this is cut out district CA, make that image B S ' appears as static in the DA of viewing area.Focusing-detection sensor 560 is identical with in the past focus sensor, has the two-dimensional detection district, and whether be to use existent method such as method of astigmatism to survey be at focus state.In addition, focusing-detection sensor 560 is limited to light beam spot (BS) image in target area TA, thus can use the existing any type that can detect this focus state, so save its explanation.
Now describe the electric handling part of optical axis adjustable device B in detail referring to Fig. 6.Among Fig. 6, the pick-up 1B and X/Y platform 220 that contained optical detection unit 5B in said mechanism portion (comprising low range ccd video camera 500, high magnification ccd video camera 520 and focusing-detection sensor 560), plan are adjusted, also show in more detail and understand pre-amplifier unit 7B-1, the 7B-2 of basic computer portion, display part 8B and the 9B of remote control portion.As shown in the figure, pre-amplifier unit 7B-1 has local cpu 7000, X/Y positional information generation circuit 7002, stepper motor drives 7020, automated power control (APC) circuit 7040.Focus servo circuit 7042 and power supply 7044.In detail, local cpu 7000 programmings are adjusted with focusing adjustment and X/Y platform position among the control optical axis adjustable device B, have all input ends and output terminal.Specifically, local cpu focuses on the focusing ON signal of adjustment beginning and other remote signal from LD-ON signal, the expression that the 9B of remote control portion receives the bright lamp of pilot light pick-up inner laser diode.In addition, local cpu also receives one group of X/Y position sensing signal of the position that is used to survey detecting area SA1 inner light beam point (BS) image (being shown in Fig. 5) from X/Y positional information generation circuit 7002, and receives the origin position signal that shows bright step motor 228/229 origin position and export.In addition, local cpu response LD-ON signal produces lamp bright signal and it is supplied with APC circuit 7040 in output terminal; Also response focuses on the ON signal and supplies with focus servo circuit 7042 in output terminal generation triangular wave and with it; Also respond the position sensing signal of X/Y positional information generation circuit, detect the X/Y position, in the position control signal of output terminal generation, it is supplied with stepper motor drives 7020 then corresponding to the X/Y platform of this X/Y position that detects.In addition, local cpu produces focus servo ON signal in output terminal when in the target area TA of light beam spot (BS) image in detecting area SA1, and it is supplied with focus servo circuit 7042.Have again, when local cpu shows the focus state ON signal of bright expression object lens 124 focusing state in generation, produce the slopes test commencing signal, supply with the basic computer 7B-2 of portion in output terminal.
Illustrate in greater detail below, after APC circuit 7040 receives lamp bright signal from local cpu, the terminal that the output power of the laser diode 102 (Fig. 4) of the pick-up 1B that control intend is adjusted is controlled applies voltage, bright lamp, monitoring diode in the pick-up (it is the diode of laser diode 102 light quantities of monitoring pick-up), detect output not shown among Fig. 4, the voltage that control applies is so that this value becomes setting.This moment with light beam spot (BS) image projection to the focal plane 556 of puppet dish.In addition, X/Y positional information generation circuit 7002 is connected with low range ccd video camera 500, receive the vision signal output of CCD since then, the BS picture position that position sensing is used in the detecting area SA1 of the BS image P (shown in Fig. 5) that output terminal is produced leans out and uses signal then, and output is through local cpu.The position control signal that driver 7020 response local cpus receive drives step motor 228 (Fig. 3).
The focus servo circuit of being located among the pre-amplifier unit 7B-1 7042 is connected with focusing-detection sensor 560, have and receive the input end of the expression focus state signal of sensor since then, then at output terminal, in a kind of mode of operation is in the detection mode of position, receive triangle wave voltage from local cpu, generation triangular wave output, and be in the focus servo pattern in another kind of mode of operation, produce corresponding to the focusing of the focus state that detects and adjust signal.In addition, in the detection mode of position, entered from the moment of local cpu collectiong focusing ON signal, and in the focus servo mode, then entered from the moment of the servo ON signal of local cpu collectiong focusing.In a word, the focus actuator 122 that signal is supplied in the pick-up 1B that intends adjustment is adjusted in triangular wave output or focusing, and this actuator moves the position of object lens 124 or fine motion along optical axis direction then.In the focus servo pattern, keep the focusing state of object lens 124.After focus servo circuit 7042 detects this focusing state then, produce the focus state ON signal of representing this situation, supply through local cpu in output terminal.The power supply 7044 that comprises among the pre-amplifier unit 7B-1 connect into respect to CCD500,520 and the pick-up 1B that intend to adjust supply with electric power.Also be provided with CCD output dip switch SW among the pre-amplifier unit 7B-1, be used for selecting a side of low range CCD500 or high magnification CCD520 output, be supplied among the 7B-2 of basic computer portion.Under common situation, this switch SW is set the output of selecting high magnification CCD520 for.In addition, the output terminal of each CCD, the lead-out terminal of each watch-dog all are used for being connected with the watch-dog of each ccd video camera output.
Again as shown in Figure 6, the 7B-2 of basic computer portion has video a/d port 7200 to receive the vision signal output from pre-amplifier unit 7B-1, handle the vision signal that is transformed to digital form through this port then, generation is used to adjust the image of object lens gradient, this image is offered the display device monitor of display part 8B.Though the position control of being undertaken by the location division 70 of Fig. 1 is to realize in pre-amplifier unit 7B-1.But the function of the projected image of Fig. 1 swing control part 72 also can be realized by the program that the 7B-2 of basic computer portion carries out.
Referring to Fig. 7, a form of implementation of X/Y positional information generation circuit 7002 is described at this.X/Y positional information generation circuit 7002 as shown in the figure, have synchronizing separator circuit 70020, pedestal level clamp circuit 70022 and binarization circuit 70024 from low range ccd video camera 500 receiving video signals, in detail, synchronizing separator circuit is according to the video signal generating vertical synchronizing signal that receives and horizontal-drive signal, odd/even field judgment signal, back porch case position signal.Vertical synchronizing signal since one vertical during the time after the regular hour, become high level (H), and horizontal-drive signal becomes high level when the beginning of a horizontal period, even/odd field judgment signal is high level when odd field.And when even field low level (L).The synchronizing separator circuit that sort signal takes place belongs to known.For example can separate IC by commercially available audio video synchronization realizes.In addition, clamp circuit 70022 has the input end that receives from the vision signal of ccd video camera 500 in input, reception is from the input end of the back porch clamp signal of synchronizing separator circuit, and, vision signal is carried out clamp for the DC level that makes the vision signal during the back porch clamp signal becomes earth level.Binarization circuit 70024 with the vision signal input that receives this clamp is created in that predetermined threshold value becomes high level when above and becomes low level signal during less than this threshold value, and Gui Ding threshold value is the threshold value that is used to detect the image of light beam spot (BS) here.
One group of X/Y position that vertical synchronizing signal, horizontal-drive signal, even/odd field judgment signal, two-value signal are configured for surveying above-mentioned light beam spot picture position leans out uses signal, in the input local cpu.
Counter 1 judgment signal on the scene in the local cpu is when showing the high level of bright odd number, begins the counting of horizontal signal number after synchronizing signal, when two-value signal becomes high level in the time in the flow field then, stops counting.Count value when this stops becomes the Y-axis position counting, the position of light beam spot (BS) image P in Y direction among the expression detecting area SA1.For example when the count value of counter 1 than the value A of regulation (for example 127) hour, image B S then is positioned under the picture center when big being worth than this on the picture center.Poor according to setting A therewith can be calculated the Y direction position of image B S.On the other hand, local cpu inside counting device 2 begins counting during for high level in horizontal-drive signal, then to time of the setting B that is equivalent to 1 horizontal period (for example 62.0 microseconds), for example by the counting reference clock, the instrumentation time, when two-value signal becomes high level in 1 horizontal period, stop counting constantly in this.The count value of this moment becomes the Y position counting, the X-axis position of expression BS image P in detecting area SA1.But in 1 horizontal period two-value signal do not become high level the time, remove counter 2, begin counting then to next 1 horizontal period.For example instrumentation time ratio setting is B hour, and process decision chart in the picture center left, and when bigger than setting B, judges that it is on right side, picture center as BS.During the even field,, carry out the control of X/Y platform so that image B S arrives the picture center according to the X/Y position that detects in during the odd field.In addition, though above-mentioned counter 1 and 2 is to realize with software, also can constitute by hardware.
Below with reference to Fig. 8 the evaluation of the light picker that utilizes the described optical axis adjustable device B of above contrast Fig. 2-7, the whole flow process of adjustment are described.At first in the light picker that step S2 will adjust object inserts two axles 225 in the installation head 226 be installed to optical axis adjustable device B, fixedly assemble by spring pressure.In step S4, behind the LD-ON switch among the 9B of operating and remote controlling portion, response comes the LD-ON signal of switch since then then, gives APC circuit 7040 with lamp bright signal by local cpu 700, makes the laser diode 102 bright lamps of the pick-up 1B that intends adjustment.Thus, light beam spot (BS) image projection is to the focal plane 556 of puppet dish.Carry out the gradient adjustment of object lens 124 then in step S6.This gradient adjustment process comprise the catching of BS image used in focus on adjusting/tracking step, continue after the focusing set-up procedure, also have the swing of BS image to suppress step and adjust operation again by the gradient that the operator carries out.Adjust in the operation, the BS image that the operator has suppressed based on vibration rotates adjustment screw 126 and 128 by adjust button with gradient, adjusts the gradient of the object lens of light picker.After this step was finished, the optical axis of the light picker that just is through with was adjusted operation.
Continuation illustrates in greater detail the gradient adjustment process step S6 of Fig. 8 referring to Fig. 9 and 10.This adjustment process comprises catching/tracking step of BS image as mentioned above.At first in step S10, corresponding to the operation of the focusing ON switch of remote control portion, local cpu 7000 will focus on the ON signal and send focus servo circuit 7042 to.In step S12, focus servo circuit 7042 becomes the position sensing pattern then, applies triangular wave with respect to the focus actuator 122 of pick-up, the object lens position of search BS image focusing.Specifically, when the light beam from the pick-up of intending adjusting converges to focus near the focal plane of puppet dish, do not observe BS dot pattern picture in the ccd video camera 500,, search for the roughly operation of focusing position so focus actuator is moved up and down.Thus, object lens 124 are along optical axis direction (above-below direction among Fig. 4) vibration, thereby the focus state of BS image on the focal plane 556 of puppet dish changes.BS image P is at least within the detecting area SA1 of ccd video camera 500.This moment is in step S14; Local cpu is surveyed the signal from X/Y positional information generation circuit 7002.Specifically, when focus actuator received focusing state, local cpu received the Y-axis position counting and the X-axis position counting of counter 1 with the counter 2 of the Fig. 7 in it, the X/Y position of detecting light beam dot image.In step S16, when also having understood fully the object lens position near focusing state when receiving these countings, it is the center that three during with count pick up has the wave voltage value, dwindles the variation range of triangular signal amplitude.Often can obtain the focus state of BS image or approaching with it focusing state thus.Again in step S18, local cpu whether in target area TA, carries out size relatively with the coordinate on TA border, definite target area with respect to the represented picture position of Y-axis position counting and X-axis position counting.In the time of beyond judging in the target area, the margin of error on computed image position and border makes the X/Y platform reduce direction along this margin of error and moves, and position signalling is offered stepper motor drives.Then in step S20, the position of judging the BS image whether in target area TA, in the situation of NO, repeated execution of steps S18, and, carry out step S22 in the YES situation.
Figure 11 (a) shows that bright BS image enters ccd video camera image actual under the target area TA internal state of Fig. 5 (a).By the image of Figure 11 (a) as can be known.The image of light beam spot is positioned at the center in zone.Beyond center image, can also see two little light beam spots in addition, but this is a beamlet, does not have direct relation with the present invention.
Again in Fig. 9, at step S22, because in the BS image target approach district TA, local cpu produces focus servo ON signal in focus servo circuit 7042.So focus servo circuit 7042 enters the focus servo pattern, under this pattern, start focus servo.Under the focus servo mode, focus servo circuit 7402 is ended applying of above-mentioned triangular wave, only just the signal that is used to return focusing state is supplied with focus actuator 122 in the situation that departs from focusing state, like this, even continue after the adjustment gradient during, also often can keep focusing state.The situation that this focusing state is keeping is notified local cpus by focus state ON signal from focus servo circuit 7042.In step S24, local cpu promptly produces the slopes test commencing signal in step S26 behind its focus state ON signal that detects the self-focusing servo circuit, supply with the basic computer 7B-2 of portion.
Referring to Figure 10, describe the remainder in Fig. 8 gradient adjustment flow process in detail.At first in step S30, after the personal computer of the 7B-2 of basic computer portion receives the slopes test commencing signal from local cpu 7000, in step S32, to be transformed to digital signal by video a/d port 7200 from the vision signal of high magnification ccd video camera 520, detect the centre of gravity place of the interior BS image of detecting area SA1 (Fig. 5 (b)) according to this digital signal.To be that the image that the zone at center promptly cuts out in the district CA cuts out then with the centre of gravity place that detects, be shown on the display monitor 8B by making it, to suppress the swing of light beam spot image.Figure 11 (b) show bright reality high magnification ccd video camera image cut out the district in the BS image.In step S34, also show simultaneously along the X-axis of passing through its center and the Luminance Distribution of Y-axis again with respect to the BS image.
Figure 12 provides the actual displayed example of the Luminance Distribution of X-axis and Y-axis.As we can see from the figure the center roughly the circle picture and in addition first annular as portion's 1 secondary ring.
In the step S36 of Figure 10,, calculate the luminance difference of 1 secondary ring below, show with vector form the how luminance difference of degree is arranged on which direction in another zone (not shown) on display according to the monitor picture of the image that cuts out district CA.Then in step S38, if this vector length be luminance difference in certain threshold value, within allowed band, then make " OK " when gradient and show, surpass this threshold value and then carry out " NG " (bad) and show.This step is returned step S32 after finishing again, and above step is carried out during adjusting gradient repeatedly.
Referring to Figure 13 detailed description the flow process that high speed swinging is controlled is carried out in the swing inhibition of the light beam spot image of the step S32 execution of Figure 10 at last.At first in step S40, the odd field of pixel that individual counting machine 7B-2 will constitute the vision signal of high magnification CCD deposits storer (1 time deposit the pixel data of 1 part in) in, again in step S42, according to the start address of pixel data (the black and white situation is a luminance signal component) of 1 part of its odd field of storage, read luminance signal in turn.Continue in step S44 the storage address of the pixel data of storage brightness more than threshold value (this threshold value is used to judge having or not of light beam spot image).After the brightness of the pixel data that finishes the odd field part is judged,,, calculate the center of gravity of light beam spot image according to a plurality of storage addresss of step S44 storage in step S46.
Generally, the calculating of this center of gravity can be undertaken by following formula when quality is regarded as in the brightness of each pixel data.
M＝(m
1·x
1+m
2·x
2+……+m
i·x
i+……+m
n·x
n
)/(m
1+m
2+……+m
i+……+m
n)
(1)
In the following formula, the M heart location of attaching most importance to, m is the brightness of pixel data, and x is the storage address of pixel data, and n is the storage address sum of 1 part.Molecule in the following formula is the long-pending summation of memory address value and pixel data, denominator for the picture logarithmic data and.
The present invention simplifies the calculating of following formula.Specifically, in step 44, use threshold value to make the pixel count data be " 0 " and " 1 " by binaryzation.Like this, in molecular computing, the mixi item that does not reach the pixel data of threshold value can be removed in advance, and used mixi item causes m=1 owing to binaryzation in calculating, thereby just have the value of the storage address of the above brightness of threshold value.In addition, denominator also can calculate the number of the memory of data address with " 1 " because the result of binaryzation promptly becomes the sum of the above pixel data of threshold value.So M becomes memory storing address in the step 44 and divided by the result of the number gained of step S44 memory storing address.Because calculated amount is few, can calculate center of gravity at high speed among the present invention.But if only limit to realize gradient adjustment operation, but then also use following formula (1) to calculate to former state with fully fast speed.In addition, be after being in the storer pixel data of 1 part of storage, reading these data from storer and carry out center of gravity calculation in this form of implementation, but carry out above-mentioned computing during with write store mutually concurrently.
After in step 48, being used for prison and visiting device display position appointed function by the above center of gravity that calculates, can suppress the swing of light beam spot image, the watch-dog display position appointed function here refers to, behind the centre of gravity place address of image P, the specified scope in advance that will comprise this position also is the function that the image section that cuts out district CA of Fig. 5 (b) shows on watch-dog in the picture of specifying detecting area SA2.This function is, according to the pixel data of storing in the video memory with address space, judge that be equivalent to comprise the center of gravity address cuts out cutting out of CA of district and use address space, from then on cuts out address space then repeatedly and reads pixel data, the function of supplying monitoring device.For instance, watch-dog display position appointed function, by using commercially available " VisualBasic ", can realize: (1) specifies the viewing area; (2), specify the data file in the storer of intending showing according to Picture Load order; (3) according to each order of top and left, specify the coordinate (storage address) that is equivalent to cut out in the file initial point of distinguishing CA.So light beam spot image such as Fig. 5 (c) with shown in Figure 12, are static seemingly.The operator who carries out the gradient adjustment can adjust the screw of control gradient when observing static light beam spot image.
As above the optical axis tilt adjusting apparatus of Shuo Ming an embodiment of the present invention is the gradient that is used for adjusting object lens, but the one skilled in the art be when being understood that, it also can be used for adjusting the gradient of other the lens or the optical axis of optical system.In addition, be that the combination by software and hardware has realized location division 70 and projection image's swing control part 72 in above-mentioned form of implementation, but also can realize with hardware fully, or, realize with software fully according to the processing speed of used CPU according to concrete situation.
Claims (19)
1. optical system evaluation apparatus comprises:
Base;
Basal disc by this base support;
Be installed on the X/Y platform on the side in the upside of this basal disc and the downside, and this X/Y platform is what to be used for installing as the optical devices of evaluation object thereon; And
Be installed on the photo-detector on the opposing party in the upside of this basal disc and the downside.
2. optical system evaluation apparatus according to claim 1 is characterized in that also comprising: image processing apparatus,
This image processing apparatus suppresses the swing of the projection image of above-mentioned image by handling the image of the above-mentioned photo-detector of surveying from the projection image to the optical system device of above-mentioned evaluation object.
3. optical system evaluation apparatus according to claim 2 is characterized in that also comprising: display,
This display has the viewing area of the above-mentioned image that shows above-mentioned image processing apparatus,
The above-mentioned projection image of the image that shows in above-mentioned viewing area then is shown in the reference position in the above-mentioned viewing area.
4. optical system evaluation apparatus according to claim 1 is characterized in that: above-mentioned base and basal disc along continuous straight runs extend, and above-mentioned X/Y platform can make the optical system device of above-mentioned evaluation object do relative moving with respect to above-mentioned basal disc along continuous straight runs.
5. optical system evaluation apparatus according to claim 4 is characterized in that: above-mentioned X/Y platform comprises the installation head of the optical system device that is used to install commentary valency object,
This installation head towards with above-mentioned optical system device in the direction of optical axis approximate vertical of contained optical system install.
6. optical system evaluation apparatus according to claim 5 is characterized in that:
Above-mentioned light prober comprises the detection optical system of the picture of the optical system device projection that is used to receive above-mentioned evaluation object,
The above-mentioned detection optical system of this photo-detector extends towards the direction vertical with above-mentioned side's side that above-mentioned X/Y platform is installed from above-mentioned the opposing party's side of above-mentioned basal disc that above-mentioned photo-detector is installed, and the front end of above-mentioned detection optical system then is positioned near the above-mentioned optical system of the optical system device that is installed in the above-mentioned evaluation object on the above-mentioned X/Y platform.
7. optical system adjusting gear with each described optical system evaluation apparatus in the claim 1～6.
8. the optical axis evaluating apparatus of an optical system, it is the device that the optical axis of optical system is estimated, and comprising:
Display with viewing area;
To project to projection image's acquisition equipment that picture on the reference field often is shown in reference position on the above-mentioned viewing area from optical system.
9. optical axis evaluating apparatus according to claim 8, it is characterized in that: above-mentioned projection image acquisition equipment comprises: to projecting to the photo-detector that the picture on the reference field makes a video recording from optical system and the image of above-mentioned photography being shown in the acquisition control device at place, reference position on the above-mentioned viewing area.
10. optical axis evaluating apparatus according to claim 9 is characterized in that: above-mentioned photo-detector comprises:
Constitute the puppet dish of the said reference face of the picture that receives the projection on its optical axis of above-mentioned optical system;
Projection image on the said reference face is produced first detector with first detecting area of first photographed images with the shooting of first multiplying power;
Above-mentioned projection image is produced second detector with second detecting area of second photographed images with second multiplying power shooting that is higher than first multiplying power,
This second detecting area is then corresponding to the given zone in above-mentioned first detecting area.
11. optical axis evaluating apparatus according to claim 10 is characterized in that: above-mentioned first and second detector comprises two-dimentional imaging apparatus.
12. optical axis evaluating apparatus according to claim 11 is characterized in that: above-mentioned two-dimentional imaging apparatus is the ccd video camera that produces the signal of video signal format.
13. optical axis evaluating apparatus according to claim 10 is characterized in that, above-mentioned acquisition control device comprises:
Receive above-mentioned first photographed images, above-mentioned optical system can be made to adjust relatively positioning means for positioning with respect to above-mentioned photo-detector, this locating device carries out work so that above-mentioned projection image is positioned at the above-mentioned given zone on above-mentioned first detecting area;
Receive above-mentioned second photographed images, make the image of above-mentioned projection image be shown in place, reference position in the above-mentioned viewing area of aforementioned display device, thus to suppress projection image's oscillating control device that projection image swings on above-mentioned viewing area.
14. optical axis evaluating apparatus according to claim 13 is characterized in that, above-mentioned projection image oscillating control device comprises: projection image's positional detecting device of surveying above-mentioned projection image position in above-mentioned second photographed images;
Produce the image section that comprises above-mentioned projection image position in above-mentioned second photographed images and supply with the image acquiring apparatus of aforementioned display device.
15. optical axis evaluating apparatus according to claim 14 is characterized in that, above-mentioned projection image positional detecting device comprises:
Have data of storing above-mentioned second photographed images and the storer that is configured to a plurality of addresses of matrix form;
According to the view data of storing in above-mentioned a plurality of addresses and these addresses, calculating is corresponding to the center of gravity calculation device of the center of gravity address of the center of gravity of above-mentioned projection image, and the center of gravity of above-mentioned projection image is represented above-mentioned projection image position.
16. optical axis evaluating apparatus according to claim 15 is characterized in that, above-mentioned center of gravity calculation device comprises:
Store in the 1 field picture data of storing in above-mentioned a plurality of addresses of above-mentioned storer the memory storage of this luminance signal address of luminance signal when threshold value is above;
Receive at least one address of storing in the above-mentioned memory storage with respect to above-mentioned 1 view data, the value addition of this at least one address again divided by the number of this at least one address, is calculated the calculation element of above-mentioned center of gravity address thus.
17. optical axis evaluating apparatus according to claim 15 is characterized in that, above-mentioned image acquiring apparatus comprises:
Determine to comprise the address space of the address space of above-mentioned center of gravity address and determine device, this address space determines that device produces the address of this address space in turn;
Receive above-mentioned address space and determine the address of device, read the view data of storing on this address in the above-mentioned storer and supply with the reading device of aforementioned display device.
18. optical axis evaluating apparatus according to claim 15 is characterized in that:
Aforementioned display device has watch-dog display position appointed function;
The said extracted device is used as watch-dog display position assigned address with above-mentioned center of gravity address.
19. system optical axis adjusting gear with each described system optical axis evaluating apparatus in the claim 8～18.
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| CN102252821A (en) * | 2011-07-25 | 2011-11-23 | 福州福赛特光学仪器有限公司 | Parameter detection method for optical lens and detecting instrument thereof |
| CN104880299A (en) * | 2015-06-23 | 2015-09-02 | 深圳市时代华影科技股份有限公司 | Brightness uniformity detection system of high-luminous-efficiency 3D projection system |
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| CN104280219B (en) * | 2014-10-24 | 2018-01-02 | 青岛歌尔声学科技有限公司 | Head-mounted display lens assembly test machine |
| CN105222999B (en) * | 2015-11-09 | 2017-07-25 | 北京理工大学 | A kind of portable visible ray/infrared double-waveband dynamic scene analogue means |
| CN110967166B (en) * | 2018-09-28 | 2022-07-01 | 舜宇光学（浙江）研究院有限公司 | Detection method, detection device and detection system of near-eye display optical system |
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| CN1083134C (en) * | 1998-01-07 | 2002-04-17 | 索尼精密部件(惠州)有限公司 | Real-time regulating apparatus and method for objective optical-axis of optical pick-up device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102252821A (en) * | 2011-07-25 | 2011-11-23 | 福州福赛特光学仪器有限公司 | Parameter detection method for optical lens and detecting instrument thereof |
| CN102252821B (en) * | 2011-07-25 | 2013-07-03 | 孙宏 | Parameter detection method for optical lens and detecting instrument thereof |
| CN104880299A (en) * | 2015-06-23 | 2015-09-02 | 深圳市时代华影科技股份有限公司 | Brightness uniformity detection system of high-luminous-efficiency 3D projection system |
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| CN100514464C (en) | 2009-07-15 |
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