JP2005044441A - Adjusting method of erecting mirror, and optical pickup device using same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust an erecting mirror by using an autocollimator even in an optical pickup device of a finite optical system. <P>SOLUTION: This is an adjusting method of the erecting mirror 2 of the optical pickup device 4 which is provided with a light source 1 and an erecting mirror 2 for changing the direction of the light emitted from the light source, and which is made up of the finite optical system 3. The erecting mirror 2 is adjusted by using an adjusting tool 5 for the erecting mirror 2, a collimator lens 6, and an autocollimator 7; attaching the optical pickup device 4 to the adjusting tool 5; attaching the collimator lens 6 to the adjusting tool 5 so that the exit light from the collimator lens 6 becomes parallel light when the erecting mirror 2 is adjusted to a predetermined position; and using the autocollimator 7 so that the exit light from the collimator lens 6 becomes parallel. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for adjusting a raising mirror and an optical pickup device using the same. More specifically, the present invention relates to a method for adjusting a rising mirror for an optical pickup device of a finite system that does not use a collimator lens and includes a rising mirror, and adjusts the rising mirror by this method. The present invention relates to an optical pickup device.

  As an optical pickup device, an infinite optical system in which light emitted from a light source is totally reflected by a rising mirror (RM), then collimated by a collimator lens, and the collimated light is condensed by a condenser lens There is. In this type of optical pickup device, the parallel light (start-up light) totally reflected by the start-up mirror is observed with an autocollimator, and the start-up light optical axis is aligned with the optical axis of the condenser lens. The mirror position and angle are adjusted.

  In addition, in an infinite optical system optical pickup device including a collimator lens, there is a technique disclosed in Japanese Patent Application Laid-Open No. 2000-251310 for adjusting a rising mirror.

JP 2000-251310 A

  Recently, due to the widespread use of DVDs and the like, the use of a finite optical system that includes a rising mirror and does not use a collimator lens as an optical pickup device has been studied.

  However, in the optical pickup device of the finite system optical system that does not use the collimator lens, the raising mirror cannot be adjusted by the same method as the optical pickup device of the infinite system optical system described above. That is, the optical pickup device of the finite system does not use a collimator lens, so there is no means for collimating the light that has been totally reflected by the rising mirror (the rising light). The startup mirror could not be adjusted using an autocollimator. For this reason, in the optical pickup device of the finite system optical system, as in the case of the optical pickup device of the infinite system optical system, there has been a demand for development of a technique for adjusting the rising mirror using an autocollimator.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a method for adjusting a raising mirror that can be adjusted using an autocollimator even in an optical pickup device of a finite system. It is another object of the present invention to provide an optical pickup device in which a rising mirror is adjusted using such a method.

  In order to achieve this object, the invention described in claim 1 includes a light source and a rising mirror that changes the direction of the light emitted from the light source, and an optical pickup device configured by a finite optical system. A method for adjusting the raising mirror, when the raising mirror is adjusted to a predetermined position by using the raising mirror adjustment jig, collimator lens, and autocollimator and attaching the optical pickup device to the adjustment jig. The collimator lens is attached to the adjustment jig so that the light emitted from the collimator lens becomes parallel light, and the rising mirror is adjusted using an autocollimator so that the light emitted from the collimator lens becomes parallel.

  Therefore, when the optical pickup device is attached to the adjustment jig, the collimator lens previously attached to the adjustment jig is positioned in front of the rising mirror of the optical pickup device. For this reason, the rising light reflected by the rising mirror passes through the collimator lens and becomes parallel light.

  The collimator lens is adjusted and attached so that the passing light (emitted light) of the collimator lens is observed as parallel light by the autocollimator when the installation angle and position of the rising mirror are accurate. While observing this passing light with an autocollimator, the angle and position of the rising mirror are adjusted so that the passing light becomes parallel light. That is, the position and angle of the rising mirror can be adjusted while observing with an autocollimator so that the light passing through the collimator lens becomes parallel light.

  According to a second aspect of the present invention, the light source is a light source for recording / reproducing a DVD. That is, the rising mirror of the DVD optical pickup device can be adjusted.

  Furthermore, an optical pickup device according to a third aspect is obtained by adjusting the rising mirror using the method for adjusting the rising mirror according to the first or second aspect. Therefore, an optical pickup device having a rising mirror adjusted by the rising mirror adjusting method according to claim 1 is provided.

  Therefore, according to the adjustment method of the rising mirror according to the first aspect, the angle and position of the rising mirror can be adjusted using the autocollimator even in the optical pickup device of the finite system. That is, even in a finite optical system optical pickup device that does not include a collimator lens, the angle and position of the rising mirror can be adjusted in the same manner as an infinite optical system optical pickup device that includes a collimator lens. it can. The method of adjusting the angle and position of the rising mirror using an autocollimator has been used for many years for optical pickup devices of infinite optical systems, has been mastered by operators, and has excellent workability and reliability. . In the present invention, such an excellent method can also be used for an optical pickup device of a finite system. Further, it is not necessary to prepare a dedicated and expensive measuring instrument for adjusting the rising mirror, and the cost increase can be suppressed.

  In particular, in the method for adjusting the raising mirror according to the second aspect, the raising mirror can be adjusted for the optical pickup device for DVD.

  In the optical pickup device according to the third aspect, it is possible to obtain an optical pickup device in which the angle and position of the rising mirror are adjusted by the method described above.

  Hereinafter, the configuration of the present invention will be described in detail based on the best mode shown in the drawings.

  1 to 7 show an example of an embodiment of an optical pickup device to which the present invention is applied and a method for adjusting a rising mirror thereof. This adjustment method of the rising mirror includes a light source 1 and a rising mirror 2 that changes the direction of the light emitted from the light source 1, and starts up an optical pickup device 4 that includes a finite optical system 3. This is a method for adjusting the mirror 2. Using the adjustment jig 5 of the raising mirror 2, the collimator lens 6 and the autocollimator 7, the optical pickup device 4 is attached to the adjustment jig 5, and the collimator is adjusted when the raising mirror 2 is adjusted to a predetermined position. The collimator lens 6 is attached to the adjustment jig 5 so that the light emitted from the lens 6 becomes parallel light, and the rising mirror 2 is adjusted using the autocollimator 7 so that the light emitted from the collimator lens 6 becomes parallel. Is.

  For example, the light source 1, the half mirror 8, and the raising mirror 2 are attached to the frame 4 a of the optical pickup device 4. The light source 1 is, for example, a DVD recording / reproducing light source, for example, a laser diode. The half mirror 8 and the raising mirror 2 are attached to the back surface of the frame 4a. The light emitted from the light source 1 toward the half mirror 8 is reflected toward the rising mirror 2, and after being totally reflected by the rising mirror 2, passes through the hole 4b and proceeds to the front side of the frame 4a. Is launched almost vertically.

  As shown in FIGS. 2 to 5, the adjustment jig 5 includes a pedestal 9 to which the optical pickup device 4 is attached and a lens side jig 10 to which the collimator lens 6 is attached. In FIG. 5, the autocollimator 7 is not shown. The pedestal 9 is provided with a pair of rods 11 and 12, and the optical pickup device 4 is moved to the back while passing through the holes 4c and notches 4d of the optical pickup device 4 until the rods 11 and 12 pass. Thus, the optical pickup device 4 can be attached to the base 9 while accurately positioning the optical pickup device 4 at a predetermined position.

  The lens side jig 10 supports the collimator lens 6, and includes a tilt adjustment mechanism 13 for adjusting the angle of the collimator lens 6, a vertical adjustment mechanism 14 for adjusting the position of the collimator lens 6, and a horizontal adjustment mechanism 15. Have. Further, a retracting mechanism 16 is provided in the lens-side jig 10 so that the lens-side jig 10 does not get in the way when the optical pickup device 4 is attached to or detached from the base 9.

  More specifically, the lens-side jig 10 includes a base 17 in which the positional relationship with the base 9 is accurately positioned, an arm 18 connected to the base 17, and a connection block 19 at the tip of the arm 18. The attachment part 20 connected is provided. The arm 18 is connected to the base 17 so as to be rotatable in a direction indicated by an arrow in the drawing. A mechanism for rotating the arm 18 relative to the base 17 is a retraction mechanism 16.

  The tip of the arm 18 is bent at a right angle in the horizontal direction. The connection block 19 is attached to the tip of the arm 18 so as to be slidable in the vertical direction. By increasing or decreasing the screwing amount of the adjustment screw 21, the attachment position of the connection block 19 can be changed in the vertical direction for adjustment. This adjustment mechanism is the vertical adjustment mechanism 14.

  The attachment portion 20 is attached to the connection block 19 so as to be slidable in the left-right direction. By adjusting the screwing amount of the adjustment screw 22, the attachment position of the attachment portion 20 can be adjusted by changing it in the left-right direction. This adjustment mechanism is the left-right adjustment mechanism 15.

  For example, a collimator lens holder 23 shown in FIG. 3 is attached to the bottom surface of the attachment portion 20. The collimator lens holder 23 supports the collimator lens 6 and is attached to the attachment portion 20 by, for example, four screws 24. By increasing or decreasing the screwing amount of each screw 24, the inclination of the collimator lens holder 23 can be changed and adjusted. This adjustment mechanism is the tilt adjustment mechanism 13.

  When the mounting portion 20 is lifted up by the retracting mechanism 16 of the lens side jig 10 and the optical pickup device 4 is attached to the base 9, the optical pickup device 4 is disposed horizontally below the autocollimator 7. When the mounting portion 20 is lowered by the retracting mechanism 16, the collimator lens 6 is disposed at a predetermined position directly above the mounting position of the rising mirror 2. The position of the collimator lens 6 is accurately adjusted by using a reference pickup that has previously set a reference. That is, when the reference pickup is attached to the pedestal 9, the angle and position of the collimator lens 6 are adjusted so that the rising light totally reflected by the rising mirror 2 is observed by the autocollimator 7 as parallel light. deep. The angle of the collimator lens 6 is adjusted by the tilt adjustment mechanism 13, and the position is adjusted by the vertical adjustment mechanism 14 and the horizontal adjustment mechanism 15.

  Since the angle and position of the collimator lens 6 are adjusted in advance using the reference pickup in this way, the optical pickup device (optical pickup device to be adjusted) 4 for adjusting the rising mirror 2 is attached to the base 9. By simply lowering the mounting portion 20 of the lens side jig 10 and making the collimator lens 6 face the optical pickup device 4, the adjustment work of the raising mirror 2 can be started. The mirror 2 can be adjusted accurately.

  Further, since the lens-side jig 10 is provided with the retracting mechanism 16, it is possible to prevent the lens-side jig 10 from getting in the way when the optical pickup device 4 is attached to or detached from the base 9. Is excellent.

  After adjusting the rising mirror 2, the optical pickup device 4 is removed from the base 9, and a lens holder for holding an objective lens (not shown) is attached to the hole 4b to complete the optical pickup device 4. The lens holder is movable in the vertical direction.

  In this embodiment, for example, a work jig 25 as shown in FIG. The work jig 25 includes a tube 26 having sufficient rigidity to support the rising mirror 2. The inside of the tube 26 is connected to a negative pressure source (not shown) via an air passage 27, and the rising mirror 2 can be sucked and held at the tip of the tube 26. Further, the slide portion 28 to which the tube 26 is attached is slidable in the direction of arrow Z in FIG. Furthermore, as shown in FIG. 6, the base end of the tube 26 is spherical, and the angle of the tube 26 with respect to the slide portion 28 can be adjusted.

  When the light source 1 to which the laser driving power source 29 is connected is caused to emit light while the rising mirror 2 is attracted by the tube 26, the light emitted from the light source 1 is reflected by the half mirror 8 and is reflected on the rising mirror 2. Irradiated. The light totally reflected by the rising mirror 2 enters the collimator lens 6 from the hole 4b of the frame 4a, passes through the collimator lens 6, and is observed by the autocollimator 7. At this time, the angle and position of the rising mirror 2 are adjusted so that the light observed by the autocollimator 7 becomes parallel light. The angle and position of the rising mirror 2 can be adjusted by changing the angle of the tube 26 of the work jig 25 or moving the tube 26 in the direction of arrow Z in the figure. Here, the angle of the tube 26 is adjusted in the arrow X direction in FIG. 5 and the Y direction, which is the direction perpendicular to the paper surface, whereby the tilt of the rising mirror 2 is adjusted.

  After adjusting the rising mirror 2, a UV (ultraviolet) adhesive is applied between the rising mirror 2 and the frame 4a, irradiated with ultraviolet rays using the UV irradiation tube 30, the adhesive is solidified, and the rising mirror 2 is applied. To fix. Thereby, the adhesion of the rising mirror 2 is completed.

  As shown in FIG. 7, the collimator lens 6 is disposed at a predetermined position above the rising mirror 2 (a position where the distance from the light emission point of the light source 1 to the principal point of the collimator lens 6 is the focal length of the collimator lens 6). Thus, the light emitted from the collimator lens 6 becomes substantially collimated light (parallel light). While observing the emitted light with the autocollimator 7, the angle and position of the raising mirror 2 are adjusted. That is, the raising mirror 2 can be adjusted so that the light emitted from the collimating lens 6 becomes parallel light and the intensity peak is at the center of the collimating lens 6.

  The method of adjusting the angle and position of the rising mirror 2 while observing the light emitted from the collimator lens 6 with the autocollimator 7 is used in an optical pickup device of an infinite optical system and has been used for many years. For this reason, the worker is familiar with this method, and is a method excellent in workability and reliability. In the present invention, such an excellent method can be used also for the optical pickup device 4 of the finite optical system 3. Further, since the autocollimator 7 can be used as in the case of the optical pickup device of the infinite optical system, it is not necessary to prepare an expensive dedicated measuring instrument for adjusting the rising mirror 2, and the increase in cost can be suppressed. Can do.

  Further, the optical pickup device 4 of the present invention is obtained by adjusting the raising mirror 2 using the above-described method for adjusting the raising mirror 2.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in the above description, the retracting mechanism 16 of the lens side jig 10 is configured to retract the lens side jig 10 to an unobstructed position by rotating the arm 18 with respect to the base 17. It is not limited to. For example, the lens-side jig 10 may be retracted by sliding it to a position where it does not get in the way.

  Further, when the optical pickup device 4 is attached to the adjustment jig 5, the rising mirror 2 may be turned up. An example is shown in FIGS. In this case, a mirror 31 is provided that reflects the light totally reflected by the rising mirror 2 toward the autocollimator 7. After the optical pickup device 4 is attached to the pedestal 9 of the lens side jig 10, the optical pickup device 4 is prevented from coming off by using a stop pin 32. In FIGS. 8 to 10, the description of the half mirror 8 and the hole 4b is omitted.

  Also in this example, the working jig 25 is used to adjust the angle and position of the raising mirror 2. When the light source 1 to which the laser driving power source 29 is connected is caused to emit light while the rising mirror 2 is adsorbed by the tube 26, the light emitted from the light source 1 is reflected by the half mirror 8 (not shown), The raised mirror 2 is irradiated. The light totally reflected by the rising mirror 2 enters the collimator lens 6 through the hole 4b (not shown) of the frame 4a, passes through the collimator lens 6, and is reflected by the mirror 31 toward the autocollimator 7. Observed by the autocollimator 7. At this time, the angle and position of the rising mirror 2 are adjusted in the same manner as described above so that the light observed by the autocollimator 7 becomes parallel light.

  After adjusting the rising mirror 2, a UV adhesive is applied between the rising mirror 2 and the frame 4a, irradiated with ultraviolet rays using the UV irradiation tube 30, the adhesive is solidified, and the rising mirror 2 is fixed. . Thereby, the adhesion of the rising mirror 2 is completed. Since the optical pickup device 4 is mounted so that the rising mirror 2 is on the upper side, a wide working space for applying the UV adhesive can be secured, and the workability can be further improved. it can.

  In the above description, the lens side jig 10 for attaching the collimator lens holder 23 is provided, but the lens side jig 10 may be omitted. An example is shown in FIG. By attaching the optical pickup device 4 to the base 9, the optical pickup device 4 and the base 9 can hold the collimator lens holder 23. In this case, it is preferable to provide a displacement prevention positioning means between the frame 4 a and the collimator lens holder 23 or between the base 9 and the collimator lens holder 23. As the displacement preventing positioning means, for example, concavities and convexities that fit closely together can be considered. That is, a concave portion is formed on one member and a convex portion is formed on the other member, and the concave portion and the convex portion are fitted together to prevent the collimator lens holder 23 from being displaced, and to the optical pickup device 4 a collimator lens. 6 can be accurately positioned. In addition, you may provide a slip prevention positioning means between the frame 4a and the collimator lens holder 23 and between the base 9 and the collimator lens holder 23.

  Further, the collimator lens holder 23 may be fitted into the frame 4a of the optical pickup device 4 as shown in FIG. For example, as shown in FIG. 13, the collimator lens holder 23 may be fitted into the frame 4 a of the optical pickup device 4 and may be pressed by a jig 34 with a spring 33 interposed therebetween. Also in these cases, the collimator lens 6 can be accurately positioned with respect to the optical pickup device 4.

It is a perspective view which shows an example of embodiment of the adjustment method of the raising mirror to which this invention is applied. It is a perspective view which shows the lens side jig | tool of the jig | tool for adjustment. It is a perspective view which shows a collimator lens holder. It is a schematic block diagram which shows a mode that the optical pick-up apparatus was set to the jig for adjustment. It is a schematic block diagram which shows a mode that the optical pick-up apparatus is set to the adjustment jig | tool and the raising mirror is adjusted. It is sectional drawing which shows the attachment structure of the tube of a working jig. It is a figure which shows the mode of the light ray at the time of raising mirror adjustment. It is a schematic block diagram which shows the 1st modification of the jig | tool for adjustment, and shows a mode that the optical pick-up apparatus was set. It is a schematic block diagram which shows the 1st modification of the jig | tool for adjustment, and shows a mode that the optical pick-up apparatus is set and the raising mirror is adjusted. It is a figure which shows the mode of the light ray at the time of seeing from the arrow A direction of FIG. It is a schematic block diagram which shows the 2nd modification of the jig | tool for adjustment, and shows a mode that the optical pick-up apparatus is set and the raising mirror is adjusted. It is sectional drawing which shows the 3rd modification of the jig | tool for adjustment. It is sectional drawing which shows the 4th modification of the jig | tool for adjustment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source 2 Raising mirror 3 Finite optical system 4 Optical pick-up apparatus 5 Adjustment jig 6 Collimator lens 7 Auto collimator

Claims (3)

  A method for adjusting a rising mirror of an optical pickup device comprising a light source and a rising mirror for changing the direction of light emitted from the light source, and comprising a finite optical system, the adjustment of the rising mirror A jig, a collimator lens, and an autocollimator are used, the optical pickup device is attached to the adjustment jig, and the light emitted from the collimator lens is parallel light when the rising mirror is adjusted to a predetermined position. The collimator lens is attached to the adjustment jig so as to become, and the rising mirror is adjusted using the autocollimator so that the light emitted from the collimator lens becomes parallel. Adjustment method.   2. The method of adjusting a raising mirror according to claim 1, wherein the light source is a light source for recording / reproducing a DVD.   An optical pickup device, wherein the rising mirror is adjusted by using the rising mirror adjusting method according to claim 1.

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