KR100940955B1 - Automatic adjusting device for objective lens and automatic adjusting method of the same - Google Patents

Abstract

PURPOSE: An auto adjusting apparatus and method for an objective lens unit are provided to manage superiority and inferiority decision criteria for calibration as quantized data. CONSTITUTION: An objective lens unit with one or more objective lenses is placed in a finger of a first jig unit. A finger adjustment device of the first jig unit moves or rotates the finger. A second jig unit comprises a mounting jig in which a main body is settled. A camera unit(400) captures images of the beam coming out from the objective lens. A control unit(700) controls the feedback of the finger adjustment device according to the processed data of the captured images, and calibrates the position and skew of the objective lens unit automatically.

Description

AUTOMATIC ADJUSTING DEVICE FOR OBJECTIVE LENS AND AUTOMATIC ADJUSTING METHOD OF THE SAME}

The present invention relates to an automatic adjustment device and an automatic adjustment method for automatically adjusting the position and skew error of an objective lens unit for an optical pickup used in an optical device.

An optical device for recording or reproducing data on an optical recording medium is provided as an essential component, and an optical pickup is provided to write or read data by scanning the optical recording medium. The optical pickup is composed of various optical components such as a laser diode (LD) and an objective lens. These optical components must be in the correct tolerance range in their respective dimensions, assembled at the correct position in the tracking direction and the focusing direction, and must scan the light beam in the exact vertical direction without skew to the optical recording medium.

As a general optical recording medium, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-R, DVD-RW, as well as recently developed formats such as AVCHD, HD-DVD and BD-R, BD-RE, etc. Blu-ray discs require precise adjustment of the position and skew of the objective lens for optical pickup.

As a manual adjustment method for adjusting the position and skew of the objective lens, there is a method of adjusting the position and angle of the objective lens while the operator observes the optical lens through the eyepiece connected to the auto collimator. There is a way to adjust the objective lens for optical pickup while connecting the camera to the camera and the operator checking the image output on the monitor.

However, since these are all manual work depending on the judgment of the operator, there is a problem of lack of accuracy and the accuracy of the operation depends on the experience or skill of the operator who judges the monitor image since the image output on the monitor is not quantified by the quantitative data. . Therefore, there is a problem that fine adjustment and accurate adjustment work is difficult, the productivity of the optical pickup is poor, and the equipment training time takes a lot when replacing the operator.

SUMMARY OF THE INVENTION The present invention is directed to improving the above-mentioned problems, by automating the position and skew adjustment device of the objective lens unit for the optical pickup, eliminating the conventional defect occurrence factor, which was dependent on the subjective judgment of the operator, and quantifying the criteria for determining the quality of the adjustment. Provided is an automatic adjustment device and an automatic adjustment method of the objective lens unit for optical pickup, which can be managed by the collected data and can greatly reduce the time required for the adjustment operation.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

In order to achieve the above object, the automatic adjustment device of the present invention comprises a finger, which is placed on the main body portion of the optical pickup and equipped with at least one objective lens, and a finger adjusting means for moving or rotating the finger. A first jig unit; A second jig part having a seating jig on which the main body part is seated; A camera unit generating a captured image of a beam emitted from the objective lens unit; A control unit for automatically adjusting the position and skew of the objective lens unit with respect to the main body unit by feedback control of the finger adjusting unit according to the vision-processed data of the captured image; Characterized in that it comprises a.

On the other hand, in order to achieve the above object, the automatic adjustment method of the present invention, seating the main body portion of the optical pickup to the mounting jig, put the objective lens portion of the optical pickup on the finger, connecting the cable or probe to the body portion Input step; Generating a captured image of the beam passing through the objective lens unit, vision-processing the captured image, and feedback-controlling finger adjusting means for moving or rotating the finger according to the vision-processed data, thereby providing the objective lens with respect to the main body portion. An adjustment step of automatically adjusting the position and skew of the negative; A bonding step of bonding the adjusted objective lens part to the main body part; A curing step of curing the optical pickup in which the objective lens unit and the main body unit are bonded; A discharging step of discharging the cured optical pickup; It characterized in that to repeat sequentially.

According to the present invention, it is possible to greatly improve the adjustment accuracy, which was dependent on the skill of the operator at the time of manual operation, to eliminate potential defects, to eliminate the training time of the equipment for the operator, and to perform numerical data through vision processing of the captured image. By adjusting the position and the skew of the objective lens unit to obtain a certain quality, it is possible to perform a process of adjustment, bonding, curing, etc. simultaneously with a plurality of first and second units has the advantage that the productivity is improved.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms that are specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. Definitions of these terms should be made based on the contents throughout the specification.

1 is a plan view showing the basic structure of the optical device according to the present invention. 2 is a perspective view showing the appearance of an optical pickup 50 according to the present invention. 3 is a rear view briefly showing the internal structure of the optical pickup 50 according to the present invention. 4 is an explanatory diagram showing one of the optical paths P1 of the optical pickup 50 according to the present invention.

The optical device is connected to an optical recording medium 10 such as a CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-R, DVD-RW, AVCHD, HD-DVD, BD-R, BD-RE, or the like. A device for recording or reproducing data. The optical device includes a spindle motor 22 for rotating the optical recording medium 10 and a deck 20 on which the optical pickup 50 is mounted. The optical pickup 50 is moved in the inner and outer circumferential directions of the optical recording medium 10 by the feed motor 24. The main guide rod 25a and the sub guide rod 25b are provided at both sides of the optical pickup 50 to guide the sliding of the optical pickup 50. The optical pickup 50 interfaces with the optical device through a flexible cable 26 such as FPC and FFC.

The optical pickup 50 includes a main body 100 in which an optical component for generating light and exiting the optical recording medium 10 and an optical component for receiving an optical signal scanned by the optical recording medium 10 are included. The objective lens unit 200 is provided with objective lenses 210 and 220 for emitting light to the surface of the recording medium 10. As an exemplary embodiment, the optical pickup 50 may include the objective lens unit 200 provided with the objective lenses 210 and 220 and the actuator 201 driving the same in the main body unit 100. The objective lenses 210 and 220 are servo controlled by the actuator 201 in the tracking direction and the focusing direction so as to follow the pit, which is the data recording portion of the optical recording medium 10.

As an optical device, a DVD player reads an MPEG-2 signal written on a data recording surface under a disc coating with an optical pickup 50, decodes it, and displays an image. In this case, the laser of the optical pickup 50 used is a red laser, and if it is changed into a blue laser, more detailed reading is possible, so that more information can be contained in a disk of the same diameter.

The Blu-ray Disc developed for this purpose uses a blue laser with a wavelength of 405 nm to record up to 27 GB of data on a single layer of a single-sided disk with a diameter of 12 cm. The recording width of a Blu-ray disc is about 0.32 μm, which is about half that of a DVD, and has a data capacity of about five times that of a DVD having a maximum capacity of 4.7 GB. NA: Numerical Aperture (0.85) should be able to finely form the beam spot.

The optical pickup 50 shown in FIG. 1 is a BD-compatible optical pickup 50 capable of recording / reproducing data on a Blu-ray disc. The optical pickup 50 is a DVD objective lens 210 that processes a blue laser for a Blu-ray disc, as well as a DVD. And the DVD objective lens 220 for processing a red laser for CD is commonly mounted on one objective lens unit 200 to make the compact (compact) size. Therefore, there is an advantage that the size and the number of parts of the deck 20 can be reduced as compared with the case where the optical pickup for BD and the optical pickup for DVD are separately installed.

Compared to the DVD objective lens 220, the BD objective lens 210 requires more tracking and focusing control accuracy, and the BD objective lens 210 has a relative position with respect to the main body 100 compared to the DVD objective lens 220. High accuracy of skew adjustment is required. When the objective lens unit 200 equipped with the BD objective lens 210 is fixed to the main body unit 100, according to the existing manual adjustment method, accurate position and skew adjustment are difficult. This problem is greatly improved by the automatic adjustment device of the present invention.

In addition, if the DVD objective lens 220 is fixed to the main body portion 100 while adjusting the position and skew of the objective lens unit 200, the BD objective lens 210 after completing the optical pickup 50 first Is mounted on the objective lens unit 200, the position and skew adjustment of the BD objective lens 210, which requires high precision, will become quite difficult.

On the contrary, the objective lens unit 200 in which the BD objective lens 210 is mounted in advance is accurately fixed to the main body unit 100 while adjusting the position and skew, and then the DVD objective lens 220 is fixed to the objective lens unit 200. When attached to the high-precision BD objective lens 210 and the low-precision DVD objective lens 220 can be easily and quickly attached to one optical pickup 50. Application of the automatic adjustment device and the automatic adjustment method of the present invention to these embodiments can greatly improve the productivity of the optical pickup 50.

Although the case where the high-definition BD objective lens 210 and the low-precision DVD objective lens 220 are attached to one objective lens unit 200 is taken as an example, embodiments of the automatic adjustment device of the present invention are not limited thereto. .

The illustrated BD-compatible optical pickup 50 includes both a BD optical system for forming a BD optical path P1 and a DVD optical system for forming a DVD optical path P2.

The main body 100 includes, as an embodiment of the BD optical system, a BD laser diode 110, a BD GT 1101 (BD GraTing), a BD beam splitter 112, a BD collimator lens, which becomes a light source of a blue laser. 114, a BD mirror 116, a BD PDIC 118, a BD sensor lens 1181, and lens shifting means. The objective lens unit 200 is provided with a BD objective lens 210 as a BD optical system.

The BD GT 1101 corresponds to a diffraction grating that diffracts the light emitted from the BD laser diode 110 and includes slits spaced at predetermined intervals (for example, 35 μm). Analysis of the beam spot passing through the BD GT 1101 forms a high peak of the 0th order beam at the center thereof, and a low peak of the ± 1st order beam that is ± 1st order diffracted light around the 0th order beam. low peaks are formed.

The BD beam splitter 112 reflects the light incident from the BD laser diode 110 toward the optical recording medium, and passes the optical signal read through the data recording surface of the optical recording medium to the BD PDIC 118 as it is. To this end, the BD beam splitter 112 is polarized-coated and is inclined at 45 ° with respect to the optical path P1, thereby causing astigmatism, which causes a focusing error signal.

The BD collimator lens 114 is provided at the exit side of the BD beam splitter 112 and focuses the light emitted from the BD laser diode 110 into parallel light. The BD collimator lens 114 may be adjusted by the lens shifting means to adjust the focal length.

In one embodiment, the lens shift means is driven in accordance with the lens arm 1141 attached to the BD collimator lens 114 and the lens shift signal obtained from the control unit 700 via the connector 160 and the cable 26. A step motor 1143 and a lead screw 1142 for converting rotation of the step motor 1143 to sliding of the lens arm 1141 are provided.

The BD mirror 116 is disposed on the rear surface of the BD objective lens 210 and forms an optical path between the BD collimator lens 114 and the BD objective lens 210.

The BD objective lens 210 provided in the objective lens unit 200 is positioned and controlled in a tracking direction and a focusing direction by an actuator 201 having a voice coil and a magnet (not shown).

The BD PDIC 118 is, for example, a photodiode as a light receiving sensor that converts an optical signal obtained by reading an optical recording medium into an electrical signal.

The BD sensor lens 1181 focuses a beam on the BD PDIC 118 and adjusts a focal length.

On the other hand, the main body 100 has, as an embodiment of the DVD optical system, a DVD laser diode 120 for generating a red laser and a DVD GT corresponding to a diffraction grating for diffracting the light emitted from the DVD laser diode 120 ( 1201), the DVD beam splitter 122, the DVD collimator lens 124, the DVD mirror 126, and the DVD PDIC 128 as the light receiving sensor for converting the optical signal from which the DVD is read into an electrical signal, and the DVD PDIC. A DVD sensor lens 1281 for focusing an optical signal is provided on the 128. The objective lens unit 200 is provided with a DVD objective lens 220 as a DVD optical system.

The objective lens unit 200 is fixed without being skewed at the correct position of the main body unit 100 through the adjustment step, bonding step, curing step, and the like, which will be described later. One side of the optical pickup 50, which is a combination of the main body 100 and the objective lens unit 200, is provided with a main slider 150a which is movably fastened to the main guide rod 25a of the deck 20. The other side of the pickup 50 is provided with a sub slider 150b which is movably fastened to the sub guide rod 25b of the deck 20.

The driving power and control signals of the main body 100 and the tracking and focusing control signals of the actuator 201 embedded in the objective lens unit 200 are inputted and outputted to the optical pickup 50 through the cable 26 and the connector 160. do.

Meanwhile, when adjusting the position and skew of the objective lens unit 200, a finger fastening unit 250 is provided on the objective lens unit 200 so that the finger (see FIG. 7, 561) can grasp the objective lens unit 200. In addition, a hole is formed in the rear surface of the main body part 100 so that the finger (see FIG. 7) 561 may enter the finger fastening part 250. A pin hole 251 is formed in the finger fastening part 250, and a pin (see FIG. 7 and 5612) of a finger (see FIG. 7 and 561) is inserted into the pin hole 251, and a pin (see FIG. 7 and 5612). ) And the pin hole 251, the finger fastening part 250 of the objective lens unit 200 is guided to a predetermined position of the finger (see FIG. 7, 561).

5 is a perspective view showing the appearance of the automatic adjustment device of the present invention. 6 is a side view showing the first and second units of the automatic adjustment device of the present invention. 7 is a perspective view showing the first and second units of the automatic adjustment device of the present invention. 8 to 10 are schematic views for explaining the operation of the jig part of the present invention. 5 to 10, the automatic adjustment device and the automatic adjustment method will be described.

The camera unit 400 forms a photographed image (refer to FIG. 12 and 450) of the optical signal emitted from the main body unit 100 according to the control signal input from the controller 700 and passed through the objective lens unit 200. The controller 700 transmits a control signal to the finger adjusting means based on the data obtained by vision-processing the photographed image 450, and adjusts the position and the skew of the finger 561 to adjust the objective lens unit mounted on the finger 561 ( Adjust position and skew automatically.

The objective lens unit 200 is seated on the first jig unit 560, and the main body unit 100 is seated on the second jig unit 570.

The first jig unit 560 includes a finger 561 that picks up the finger fastening unit 250 and finger adjusting means for adjusting the position and skew of the finger 561. The finger 561 is connected to the magnet 562, and the fastening force of the finger 561 and the finger fastening part 250 is provided by the permanent magnetic force or the electromagnetic force of the magnet 562.

The second jig unit 570 includes calibration means for adjusting the relative position and posture of the mounting jig 571 with respect to the camera unit 400.

At this time, a cable 26 or a probe (not shown) for inputting the driving power and the control signal of the main body 100 necessary for generating the captured image 450 to the main body 100 is connected to the connector of the main body 100 ( It is preferable that a third jig portion 580 is automatically provided to the 160.

On the other hand, a virtual first axis (eg x-axis), a second axis (eg y-axis) and a third axis (eg z-axis) that are orthogonal in space are defined.

The finger adjusting means includes a first axis translation table 510 for adjusting the first axis position of the finger 561, a second axis translation table 520 for adjusting the second axis position of the finger 561, and a finger. Third axis translation table 530 for adjusting the third axis position of 561, First axis pivot table 540 for adjusting the first axis skew Tx of finger 561, Finger 561 The 2nd axis rotation table 550 which adjusts 2nd axis skew Ty of the motor, and the motor 506 are provided.

Each of the translation tables 510, 520, 530 and the rotation table 540, 550 functions as a position and skew adjustment function by the relative movement of the fixed table 5201 and the movement table 5202. A linear guide 5203 is provided between the fixed table 5201 and the moving table 5202 to guide the one-way movement. In the translation tables 510, 520 and 530, the contact surfaces of the fixed table 5201 and the movable table 5202 are flat, and the contact surfaces of the fixed table 5201 and the movable table 5202 are curved surfaces in the rotary tables 540 and 550. In the case of the third axis translation table 530, the contact surfaces of the fixed table 5201 and the moving table 5202 are inclined so that the height can be adjusted when moving in one direction.

The motor 506 may include the first axis translation table 510, the second axis translation table 520, the third axis translation table 530, the first axis rotation table 540, and the second axis rotation table 550. The driving signal to drive is acquired from the control part 700.

The calibration means includes a third axis calibration table 530 'for calibrating the third axis position of the seating jig 571, and a rotation table for adjusting the first axis skew Tx for calibrating the first axis skew Tx of the seating jig 571. 540 ', and a second shaft skew adjustment rotating table 550' for calibrating the second shaft skew Ty of the mounting jig 571. These are preferably controlled manually by knob 508.

7 to 10, the configuration and operation of the first jig unit 560 and the second jig unit 570 will be described below.

First, the main body 100 is put into the mounting jig 571. The side surface of the main slider 150a side of the main body 100 is tightly fixed to the reference surface 5715 of the mounting jig 571. The rear surface of the main slider 150a side of the main body 100 is supported by the support member 5711a. Main clamp 5712a mounted in block 5714 is actuated by main clamp cylinder 5713a and fits into main slider 150a.

The sub slider 150b of the main body 100 is fitted to the fixed rod 5711b of the seating jig 571, and the sub clamp 5712b is driven by the operation of the sub clamp cylinder 5713b. Lock the. The side surface of the sub slider 150b side of the main body 100 is also closely fixed to the reference surface 5715 of the mounting jig 571.

Referring to FIG. 10, the objective lens unit 200 is inserted into the image of the finger 561. The process of inserting the main body portion 100 into the mounting jig 571 or the objective lens portion 200 into the finger 561 may be performed by hand or by automatic feeding means (not shown). When the finger fastening part 250 of the objective lens unit 200 is placed on the finger 561, the shaking of the objective lens unit 200 is prevented by the magnetic force of the magnet 562. The correct seating position of the finger fastening part 250 is guided by inserting the pin hole 251 formed in the finger fastening part 250 into the pin 5612 formed in the finger 561.

When the mounting of the main body 100 and the objective lens 200 is completed, the cable 26 or the probe (not shown) is connected to the connector 160 of the main body 100 by the third jig part 580. It is automatically fastened, and the controller 700 applies the driving power and the control signal of the built-in optical component of the main body 100 to acquire the captured image 450 to the main body 100.

Although the structure of the third jig portion 580 is not specifically illustrated, the cable pickup means for picking up the cable 26 or the probe (not shown), the moving means for moving the cable pickup means, and the cable pick-up means are connected to the connector ( Guide means for guiding to 160 and connector operation means for opening or locking the locker of the connector 160.

Determination of the defectiveness of the cable 26 or the probe fastening state and the position and attitude control of the third jig unit 580 may be carried out by the camera unit 400 to perform vision processing on the control unit 700. This can be solved by feedback control of the three jigs 580.

When the mounting of the main body unit 100 and the objective lens unit 200 and the fastening of the connector 160 are completed by the first jig unit 560, the second jig unit 570, and the third jig unit 580, The objective lens unit 200 is obtained by acquiring a beam image of an optical signal originating from the main body unit 100 and passing through the objective lens unit 200 in the camera unit 400 and feedback-controlling the finger adjusting means according to the vision-processed data. To adjust the position and skew. At this time, the finger adjusting means is translated in the direction of the first axis, the second axis, the third axis, rotated about the first axis, or rotated about the second axis.

11 is a side view illustrating the camera unit 400 of the present invention. 12 shows a photographing area of the high magnification camera 420 and the low magnification camera 410 of the present invention. 13 is a diagram for explaining image position adjustment as an embodiment of the present invention. 14 illustrates focusing adjustment as an embodiment of the present invention. 15 illustrates a ring removal method as an embodiment of the present invention. 16 illustrates skew adjustment as an embodiment of the present invention. 5 to 7, 11 to 16 will be described in detail the operation of the automatic adjustment device.

By generating the photographed image 450 of the beam passing through the objective lens unit 200, vision-processing the photographed image 450, and feedback control of the finger adjusting means according to the vision-processed data, The adjustment step of automatically adjusting the position and skew of the objective lens unit 200 proceeds as follows.

First, referring to FIG. 11, the camera unit 400 includes a low magnification camera 410 that forms a low magnification photographed image CAM1 and a high magnification camera 420 that forms a high magnification photographed image CAM2. As an embodiment not shown, it is of course also possible to obtain a low magnification photographed image CAM1 and a high magnification photographed image CAM2 by providing a single camera and varying the magnification.

The camera unit 400 includes a beam splitter 402 for splitting an optical signal to the ND filter 401, the high magnification camera 420, and the low magnification camera 410, a barrel 403 for adjusting magnification, and a prism for changing an optical path. The mirror 404 may further include a laser diode (LD) for generating test light for testing a malfunction of the camera, and a beam splitter (BS) for branching light generated from the LD 405. .

Referring to FIG. 12, the high magnification photographed image CAM2 and the low magnification photographed image CAM1 are illustrated. For example, the high magnification photographed image CAM2 is an image photographed by the high magnification camera 420, and the low magnification photographed image CAM1 is an image photographed by the low magnification camera 410. In an embodiment, the control unit 700 vision-processes one of the low magnification captured image CAM1 or the high magnification captured image CAM2 when the position of the objective lens unit 200 is adjusted, and focusing or skewing of the objective lens unit 200. Vision-process the high magnification photographed image CAM2 during adjustment.

Referring to FIG. 13, a position shifting method of moving the position of the beam image formed on the camera unit 400 to the center of the photographed image 450 will be described. The left side of FIG. 13 shows the beam image before position adjustment, and the right side shows the beam image after position adjustment.

In one embodiment, the control unit 700 is arranged such that the zeroth order beam image 460 and the first order beam image 470 of the captured image 450 are aligned with the center of the low magnification photographing image CAM1 or the high magnification photographing image CAM2. By feedback control of the finger adjusting means, the position (x-axis position and y-axis position) of the objective lens unit 200 is adjusted. As shown, the low magnification photographed image CAM1 was used. By feedback control of the first axis translation table 510 and the second axis translation table 520, the x-axis position and the y-axis position of the beam image may be aligned with the center of the captured image 450. The x-axis position and y-axis position of 200 are adjusted.

Referring to FIG. 14, an embodiment of a focusing adjustment method for adjusting a focusing direction position (z-axis position) of a beam image will be described. According to this, the control unit 700 divides the high magnification photographed image CAM2 into a plurality of focusing inspection regions 4601 and then feedback-controls the finger adjusting means such that the areas of the focusing inspection regions 4601 of the beam image are equal to each other. The focusing (ie, focusing direction position) of the objective lens unit 200 is adjusted. This method is based on the astigmatic method.

If the focusing of the objective lens unit 200 is not adjusted, the separation distance between the optical recording medium and the objective lenses 210 and 220 cannot be maintained within the focusing controllable span of the actuator 201 and thus the recording / reproducing error of the optical device. Occurs.

If the beam image is distorted to one side, it means that the distance between the focal plane of the camera unit 400 corresponding to the data recording surface of the optical recording medium and the focusing direction of the objective lens unit 200 mounted on the finger 561 is far from each other. When the beam image is distorted to the other side, it means that the distance in the focusing direction of the objective lens unit 200 is close. In this case, if the third axis translation table 530 is adjusted such that the beam image is vision-processed so that the area for each focusing inspection area 4601 is the same, the focusing direction position of the objective lens unit 200 may be adjusted within an error range.

15 illustrates another embodiment of focusing adjustment. According to this, the control unit 700 adjusts the focusing of the objective lens unit 200 by feedback-controlling the finger adjusting means so that the Gaussian distributions for the respective projection axes of the high magnification photographed image CAM2 coincide with each other. Although Gaussian distributions for two projection axes orthogonal to each other are shown, Gaussian distributions for three or more projection axes are of course available. For example, the beam image is vision-processed to obtain a Gaussian distribution for each projection axis, and to calculate and compare the average value and standard deviation of the Gaussian distribution for each projection axis, thereby focusing the position of the focusing direction of the objective lens unit 200 within an error range. I can adjust it.

However, as shown in FIG. 15, when the ring image 4602 is generated around the zeroth order beam image 460 due to spherical aberration, the accuracy of the vision processing result is degraded. Reference signs g1 and g1 'are Gaussian distribution peaks of the zeroth order beam image 460 for different projection axes, and reference signs g2 and g2' are Gaussian distribution peaks of the ring image 4602 for different projection axes. Value.

The problem that the ring image 4602 has on the vision processing result is the same in the case of FIGS. 13 and 14. Accordingly, the control unit 700 performs a control operation to remove the ring image 4602 generated around the zeroth order beam image 460 due to spherical aberration. An example of such a control operation is adjusting the output of the BD laser diode 110 or adjusting the position of the BD collimator lens 114. The BD collimator lens 114 is position controlled by the lens shifting means.

When the ring image 4602 is removed, the skew of the objective lens unit 200 is adjusted in the same manner as the embodiment of FIG. 16. The goal of skew adjustment is to zero the skew angle θ.

Skew of the objective lens unit 200 causes coma aberration in which part of the beam image is blurred like a comet tail. The coma aberration of which a part of the beam image is distorted has been removed, indicating that the skew of the objective lens unit 200 has been adjusted. In one embodiment, the control unit 700 adjusts the skew of the objective lens unit 200 by feedback-controlling the finger adjusting means so that coma aberration is removed from the high magnification photographed image CAM2.

In addition, as an example, the controller 700 adjusts the skew of the objective lens unit 200 by feedback-controlling the finger adjusting means so that the Gaussian distributions for the respective projection axes of the high magnification photographed image CAM2 coincide with each other.

If the Gaussian distribution on each projection axis coincides or the Gaussian distribution on one projection axis is symmetrical with respect to the center point of the photographed image, it means that the beam image has an axisymmetric shape and is not distorted. Thus, although an embodiment of repeatedly calculating and comparing beam images before and after the skew adjustment with respect to one projection axis is shown, an unillustrated embodiment of repeating the skew adjustment until a Gaussian distribution with respect to different projection axes is matched is also possible. .

Although not shown in FIG. 16, the objective lens unit 200 is controlled by feedback control of the finger adjusting means such that the high magnification photographed image is divided into a plurality of focusing inspection regions, and the areas of the focusing inspection regions of the beam image are equal to each other. It is also possible to adjust the skew.

17A to 17D illustrate the movement trajectories of the first and second units 500a and 500b of the automatic adjustment device of the present invention. 18 is a plan view showing the working span of the first and second units 500a, 500b of the automatic adjustment device of the present invention. Referring to FIGS. 5 to 7, 17a to 17d, and 18 together, a plurality of first and second units 500a and 500b may be provided, and the productivity may be greatly improved by simultaneously performing the adjusting, bonding, and curing steps. The operation of the automatic adjustment device and the automatic adjustment method can be provided.

First, referring to FIG. 5, a first unit 500a and a second unit 500b in which the first jig unit 560 and the second jig unit 570 are mounted on the jig unit plate 501 are provided. . That is, the automatic adjustment device of the present invention includes a plurality of first and second units 500a and 500b.

The first unit 500a and the second unit 500b are installed to be movable on the base plate 312. The first transfer means 301 transfers the base plate 312 in a first direction (x-axis direction). Although the structure of the first conveying means 301 is not shown in detail, a structure in which the base plate 312 is linearly moved by connecting the motor and the lead screw member to the base plate 312 and driving the motor is preferable.

The base plate 312 is guided along the first shaft rail 310 provided on the surface plate 300 and the movement position is restricted by the first shaft rail stopper 311.

The second transfer means 504 transfers each of the first unit 500a and the second unit 500b in the second direction (y-axis direction) on the base plate 312. The second transfer means 504 is provided in the form of an air cylinder, it is preferable to move each jig portion plate 501 by pushing the bracket 503. The jig portion plate 501 is guided along the second shaft rail 320 formed on the base plate 312.

Referring to FIG. 18, each of the first and second units 500a and 500b equipped with the first jig part 560 and the second jig part 570 may include an adjustment station (III), a bonding station (IV), It is repeatedly transported to the curing stations I and V and the discharge / injection stations II and VI.

The adjustment station III is an area that faces the camera unit 400 and is an area where an adjustment step of adjusting the position and skew of the objective lens unit 200 is performed. The bonding station IV is an area where a bonding step of bonding the adjusted objective lens unit 200 to the main body unit 100 is performed. The curing stations I and V are areas in which the curing units 600a and 600b for curing the bonded optical pickup 50 are disposed, and the optical pickup 50 in which the objective lens unit 200 and the main body unit 100 are bonded. This is a region where the curing step of curing the resin proceeds. For example, when the bonding material is a UV curing agent, the curing units 600a and 600b are preferably ultraviolet (UV) irradiation devices.

Discharge / feed station (II, VI) is the discharge step of discharging the hardened optical pickup 50 and the input of the new main body and the objective lens unit to the first jig unit 560 and the second jig unit 570, respectively This is the area where the step proceeds.

When the first unit 500a and the second unit 500b are provided, the bonding station IV is located in front of the camera unit 400, and the bonding unit IV is located at one side of the camera unit 400. The curing station (I) is located, the discharge / injection station (II) of the first unit (500a) is located in front of the curing station (I) of the first unit (500a), and the second side of the camera unit (400) It is preferable that the curing station V of the unit 500b is located and the discharge / injection station VI of the second unit 500b is located in front of the curing station V of the second unit 500b.

Therefore, at the time of performing the adjusting step and the bonding step for the first unit 500a, at least one of the input step, the curing step, and the discharge step for the second unit 500b may be simultaneously performed.

19 illustrates another embodiment of the movement trajectory of the first and second units of the automatic adjustment device of the present invention. Here, the hardening parts 600a and 600b may be lifted and lowered, and the first unit 500a and the second unit 500b may translate in one direction.

According to this, the curing units are provided on one side and the other side of the adjusting station, respectively, and the first unit is moved toward the curing unit on one side after completing the position and skew adjustment of the objective lens unit at the adjusting station, and the second unit is moved by the first unit. After moving to the curing unit on one side, it is moved to the adjusting station.

That is, the hardened parts 600a and 600b are installed to be liftable, and when the hardened part rises, the main body part and the objective lens part are discharged / injected into the first jig part and the second jig part, respectively, and the objective lens bonded when the hardened part descends. Addition cures.

According to this embodiment, since the movement trajectories of the first unit 500a and the second unit 500b are limited in one direction, moving spans are saved, so that the adjustment and hardening work as well as the size and volume of the automatic adjustment device are possible. Can be greatly miniaturized, and since the parts for moving the first unit 500a and the second unit 500b do not need to be installed in various directions, the structure is simplified, the probability of failure is reduced, and the number of parts is greatly reduced. have.

Although embodiments according to the present invention have been described above, these are merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments of the present invention are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the following claims.

1 is a plan view showing the basic structure of the optical device according to the present invention.

2 is a perspective view showing the appearance of an optical pickup according to the present invention.

3 is a rear view briefly illustrating an internal structure of an optical pickup according to the present invention.

4 is an explanatory diagram showing one of the optical paths P1 of the optical pickup according to the present invention.

5 is a perspective view showing the appearance of the automatic adjustment device of the present invention.

6 is a side view showing the first and second units of the automatic adjustment device of the present invention.

7 is a perspective view showing the first and second units of the automatic adjustment device of the present invention.

8 to 10 are schematic views for explaining the operation of the jig part of the present invention.

It is a side view explaining the camera part of this invention.

12 shows a photographing area of a high magnification camera and a low magnification camera of the present invention.

13 is a diagram for explaining image position adjustment as an embodiment of the present invention.

14 illustrates focusing adjustment as an embodiment of the present invention.

15 illustrates a ring removal method as an embodiment of the present invention.

16 illustrates skew adjustment as an embodiment of the present invention.

17A to 17D illustrate an embodiment of the movement trajectory of the first and second units of the automatic adjustment device of the present invention.

18 is a plan view showing the working span of the first and second units of the automatic adjustment device of the present invention.

19 illustrates another embodiment of the movement trajectory of the first and second units of the automatic adjustment device of the present invention.

<Explanation of symbols for the main parts of the drawings>

10 ... optical recording media 20 ... deck

22 ... spindle motor 24 ... feed motor

25a ... main guide rod

25b ... sub guide rod

26 ... cable 50 ... optical pickup

100.Headquarters

110 ... BD laser diode 1101 ... BD GT (BD GraTing)

112.BD beam splitter

114 ... BD collimator lens

1141.lens arm

1142.lead screw

1143 ... step motor 116 ... BD mirror

118 ... BD PDIC

1181 ... BD sensor lens

120 ... DVD laser diode

1201 ... DVD GT (DVD GraTing)

122.DVD beam splitter

124 ... DVD collimator lens

126 ... DVD mirror

128 ... DVD PDIC

1281 ... DVD sensor lens

150a ... main slider

150b ... sub slider 160 ... connector

200 ... objective lens unit 201 ... actuator

210 ... BD objective lens 220 ... DVD objective lens

250 ... finger joint 251 ... pin hole

300 ... surface plate 301 ... first transfer means

310.1st axis rail

311 ... 1-axis rail stopper

312 base plate 320 ... 2nd axis rail

400 Camera unit 410 Low magnification camera

420 High magnification camera 450 Shooting images

460 ... zero order beam image

4601 ... Focusing inspection area 4602 ... ring image

470 ... first order beam image

500a, 500b ... first and second jig portion unit

501 ... jig portion unit plate

503 ... cylinder bracket 504 ... second transport means

506 servo motor 508 knob

510 ... first axis translation table 520 ... second axis translation table

5201 ... Fixed table 5202 ... Movement table

5203 ... Linear guide 530 ... Triaxial translation table

540 ... 1st axis rotation table 550 ... 2nd axis rotation table

560 ... First Jig 561 ... Finger

5612 ... pin 562 ... magnet

570 ... second jig portion 571 ... seating jig

580 ... 3rd jig part 600a, 600b ... hardening part

700 ... control unit

Claims (18)

A first jig portion having a finger mounted on a main body portion of the optical pickup and having a objective lens portion on which at least one objective lens is mounted, and a finger adjusting means for moving or rotating the finger; A second jig part having a seating jig on which the main body part is seated; A camera unit generating a captured image of a beam emitted from the objective lens unit; A control unit for automatically adjusting the position and skew of the objective lens unit with respect to the main body unit by feedback control of the finger adjusting unit according to the vision-processed data of the captured image; Automatic adjustment device comprising a. The method of claim 1, The camera unit generates a low magnification image and a higher magnification image of a higher magnification, The control unit finds a beam emitted from the objective lens unit through vision processing of the low magnification photographed image, and then adjusts the position of the objective lens unit by vision processing one of the low magnification photographed image or the high magnification photographed image, and the high magnification. Vision adjustment of the photographed image to adjust the focusing or skewing of the objective lens unit. The method of claim 1, And the control unit adjusts the position of the objective lens unit by feedback-controlling the finger adjusting means so that the beam image of the captured image is aligned with the center of the captured image. The method of claim 1, The control unit adjusts the focusing or skewing of the objective lens unit by dividing the photographed image into a plurality of focusing inspection regions, and then feedback-controlling the finger adjusting means so that the areas of the focusing inspection regions of the beam image are the same. Automatic adjustment device made. The method of claim 1, And the control unit adjusts the focusing or skewing of the objective lens unit by feedback controlling the finger adjusting means so that the Gaussian distributions for the respective projection axes of the photographed image coincide with each other. The method of claim 1, And the control unit adjusts skew of the objective lens unit by feedback-controlling the finger adjusting unit so that coma aberration is removed from the captured image. The method of claim 1, The main body includes a laser diode corresponding to a light source, a beam splitter provided at the exit side of the laser diode, a collimator lens provided at the exit side of the beam splitter, and lens shift means for moving the collimator lens. The control unit adjusts the position of the collimator lens by adjusting the output of the laser diode or controlling the lens shifting means to remove the ring image generated around the zero-order beam image due to spherical aberration. Device. The method of claim 1, A third jig unit for connecting a cable or probe for inputting driving power and control signals for the main body unit necessary for generating the photographed image to the main body unit; Automatic adjustment device further comprises a. The method of claim 1, The finger adjusting means, A first axis translation table for adjusting the position of the first axis of the finger with respect to a virtual first axis, a second axis, and a third axis orthogonal in space; A second axis translation table for adjusting the second axis position of the finger; A third axis translation table for adjusting the third axis position of the finger; A first axis pivot table for adjusting the first axis skew of the finger; And at least one of a second axis pivot table for adjusting the second axis skew of the finger. The method of claim 1, The second jig portion, And adjusting means for adjusting the relative position and attitude of the seating jig relative to the camera unit. The method according to any one of claims 1 to 10, A first unit and a second unit having the first jig portion and the second jig portion are provided, respectively. There is provided an adjustment station in which the camera unit is disposed, And the first unit and the second unit are alternately entered into and out of the adjustment station. The method of claim 11, The curing unit is provided on one side and the other side of the adjustment station, respectively The first unit is moved toward the curing unit on the one side after completing the position and skew adjustment of the objective lens unit in the adjustment station, And the second unit is moved to the adjusting station after the first unit is moved to the curing unit on one side. The method of claim 11, The hardening part for hardening the said objective lens part bonded to the said main body part by the said adjustment completed is provided, The hardened portion is installed to be elevated, When the hardened portion is raised, the main body portion and the objective lens portion are discharged / injected into the first jig portion and the second jig portion, respectively. And the bonded objective lens unit is cured when the curing unit is lowered. The method according to any one of claims 1 to 10, A first unit and a second unit in which the first jig portion and the second jig portion are mounted on a jig portion plate, respectively, The first unit and the second unit is installed to be movable on the base plate, A first transfer means for transferring the base plate in a first direction and a second transfer means for transferring each of the first unit and the second unit in a second direction on the base plate; . The method according to any one of claims 1 to 10, The first jig portion and the second jig portion, An adjusting station for adjusting the position and skew of the objective lens unit; A bonding station for bonding the adjusted objective lens part to the main body part; A curing station having a curing unit configured to cure the bonded optical pickup; And a discharge / feeding station for discharging the hardened optical pickup and feeding the main body part and the objective lens part from the first jig part and the second jig part to the other. The method of claim 15, The adjustment station faces the camera unit, The bonding station is located in front of the camera unit, The curing station of the first unit is located on one side of the camera unit, The discharge / injection station of the first unit is located in front of the curing station of the first unit, The curing station of the second unit is located on the other side of the camera unit, And the discharge / feed station of the second unit is located in front of the curing station of the second unit. Putting the main body of the optical pickup on a mounting jig, placing the objective lens of the optical pickup on a finger, and connecting a cable or a probe to the main body; Generating a captured image of the beam passing through the objective lens unit, and subjecting the captured image to feedback processing according to the vision-processed finger adjusting means for moving or rotating the finger according to the vision-processed data. An adjustment step of automatically adjusting the position and skew of the negative; A bonding step of bonding the adjusted objective lens part to the main body part; A curing step of curing the optical pickup in which the objective lens unit and the main body unit are bonded; A discharging step of discharging the cured optical pickup; Automatic adjustment method characterized in that to repeat sequentially. A first unit and a second unit having a mounting jig in which the main body of the optical pickup is seated, a finger on which at least one objective lens is mounted, and a finger on which the objective lens unit is assembled, and finger adjusting means for moving or rotating the finger. Are arranged on one side and the other side of the camera unit, When the step of automatically adjusting the position and skew of the objective lens portion and then bonding the objective lens portion to the main body portion is performed in the first unit, And discharging / injecting the objective lens unit or curing the objective lens unit in the second unit.

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