JP3552405B2 - Optical pickup device and optical recording / reproducing device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical pickup device used for optical recording / reproducing and an optical recording / reproducing device provided with the optical pickup device.
[0002]
[Prior art]
Conventionally, an optical pickup device is provided alone in an optical disk reproducing device, and is provided as an optical magnetic head mechanism in combination with a magnetic head device as an overwrite head in a recording and reproducing device of a recordable and reproducible magneto-optical disk. Have been.
[0003]
The optical magnetic head mechanism provided in the magneto-optical disk recording / reproducing apparatus is configured as shown in FIG.
[0004]
The magneto-optical head mechanism 60 applies an optical pickup device 62 having an objective lens 61 for irradiating a laser beam to the signal recording surface of the magneto-optical disk, and applies a predetermined external magnetic field to the signal recording surface of the magneto-optical disk. A magnetic head device 64 having a magnetic field application head 63 is held by a bracket 65 formed in a substantially U-shape in side view so as to face the magneto-optical disk D in the vertical direction.
[0005]
The optical magnetic head mechanism 60 includes a guide shaft hole 67a provided at one end of a slide base 66 which is a main body of the optical pickup device 62, and a substantially U-shaped guide groove 67b provided at the other end. Are respectively inserted and engaged with guide shafts 68a and 68b fixed horizontally on a chassis (not shown) side, and are supported so as to be movable in the direction of contact and separation with the turntable 70. A screw receiver 71 is attached to the bracket 65 and is screwed to a rotating screw shaft 74 of a stepping motor 73 supported by a motor bracket 72 on the chassis (not shown) side. The rotation of the rotary screw shaft 74 causes the optical magnetic head mechanism 60 to move toward and away from the turntable 70, that is, to move in the radial direction of the magneto-optical disk D chucked to the turntable 70. Recording and reproduction are performed on the magneto-optical disk D. In FIG. 8, reference numeral 69 denotes an actuator cover attached to the slide base 66.
[0006]
Further, in the optical disk reproducing apparatus, since the optical pickup device is provided independently, the screw receiver is directly attached to the slide base, the rotary screw shaft of the stepping motor is screwed, and the optical pickup device is used. The optical disc chucked on the turntable is moved in the radial direction to perform reproduction.
[0007]
[Problems to be solved by the invention]
The optical pickup device configured and operated as described above has an objective lens supported by an actuator on one half of the slide base, and an optical system member for the objective lens is housed and arranged on the other half of the slide base. The housing part of the system member is provided open to the lower surface side of the slide base, and the shield plate is housed in the optical system members such as the beam splitter, collimator lens, and condenser lens housed in this housing part. Is pressed so as to hold down.
[0008]
However, the shield plate that comes into contact with the optical system member has a large number of openings and gaps because the claw pieces are formed in a cut shape in order to come into contact with each member. It does not play the role of closing the portion, so that dust or the like may enter the housing portion, and the optical member may be stained by fingers touching the optical member at the time of assembling the optical pickup device. was there. In addition, a flexible printed wiring board is used for the lead wiring of the control circuit, and this wiring board is adhered to the upper surface of the slide base and extended long outward, which hinders the work of assembling the optical pickup device. There is a problem such as becoming.
[0009]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has an optical unit which almost completely closes a housing portion for housing an optical system member of a slide base to protect the optical system member and to take measures against dust between the members. It is an object to provide a pickup device.
[0010]
[Means for Solving the Problems]
The optical pickup device according to the present invention is an optical pickup device in which an objective lens supported by an actuator is disposed on one half of a slide base and an optical system member for the objective lens is disposed on the other half. A frame-shaped peripheral wall portion for protecting the actuator is provided on one half of the slide base and the movable side of the actuator is opened, and a lower surface of a housing portion for housing the optical system member on the other half of the slide base. The printed circuit board on which the required wiring pattern is formed is fixed to the lower surface of the other half of the slide base so that the open side of the printed circuit board is closed, and the optical system member is adjusted to the printed circuit board. An adjustment hole is formed.
[0011]
According to the optical pickup device of the present invention, since the objective lens supported by the actuator and the optical member for the objective lens are dispersed and arranged on one half side and the other half side of the slide base, the thickness can be reduced. Further, a frame-shaped peripheral wall portion for protecting the actuator is provided on one half side of the slide base, and the movable side of the actuator is opened so that the cover is not positioned so that the thickness can be reduced.
In addition, since the open side of the lower surface of the housing portion in which the optical system member of the other half of the slide base is housed is closed by the printed circuit board, the optical system member is protected by this printed circuit board and assembled. In such cases, contamination by fingers and the like is prevented, and dust is prevented between optical system members, so that an optical path can be always maintained in a normal state. Thus, reproduction of an optical disk and recording / reproduction of a magneto-optical disk are reliably performed, and reliability is improved. The performance is improved.
Further, according to the present invention, the adjustment holes for adjusting the optical system members are formed on the printed wiring board fixed to the lower surface side of the slide base, so that the adjustment of the optical system members is necessary after the assembly. The optical member can be adjusted by passing the adjustment tool through the adjustment hole from the lower surface side of the optical system.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of an optical pickup device according to the present invention will be described below with reference to FIGS.
[0013]
4 to 6, reference numeral 1 denotes an entire optical pickup device as an example, and reference numeral 2 denotes an optical pickup device which is attached to the above-described bracket or the like and is moved along the guide shafts 68a and 68b in the direction toward and away from the turntable 70. The objective lens housing 3 is formed in one half, and the optical system housing 4 is formed in the other half of the slide base. A guide shaft hole 5 that is inserted into the guide shaft 68a is provided at one end. Further, guide grooves 6 each having a substantially U-shape in a side view are formed on the other end side to be engaged with the guide shaft 68b.
[0014]
The objective lens accommodating portion 3 of the slide base 2 is formed in a concave housing shape opened to the upper surface side, and a biaxial actuator 12 holding an objective lens 11 is installed in the objective lens accommodating portion 3.
[0015]
As shown in FIG. 1, a bobbin 16 on which a focus coil 14 and a tracking coil 15 are wound is attached to a lens holder 13 for holding the objective lens 11, and the biaxial actuator 12 is mounted on an actuator substrate 17 as shown in FIG. The lens holder 13 is attached to a support 20 fixed to the actuator substrate 17 so as to be movable in the axial direction and rotatable in the axial direction on a yoke 19 fixed upright to the magnet 18 joined thereto. It is movably supported in the vertical and horizontal directions by four spring wires 21 parallel to the vertical and horizontal directions fixed at the diaphragm spring portion 21a at the base end.
[0016]
The terminals of the focus coil 14 and the tracking coil 15 of the two-axis actuator 12 are led out to the end face of the lens holder 13 opposite to the lens holding section, and are connected to the terminal section 22 fixed to the outer end face of the support 20 via a lead wire. An end 23a of a flexible printed wiring board 23 as a lead wire for supplying a control current is fixedly connected to the terminal portion 22.
[0017]
The biaxial actuator 12 holding the objective lens 11 configured as described above is housed in the objective lens housing portion 3 of the slide base 2 described above, and the actuator substrate 17 is screwed and fixed to the bottom surface thereof. From the objective lens housing 3.
[0018]
In the configuration of the present example, the objective lens accommodating portion 3 accommodating the biaxial actuator 12 holding the objective lens 11 is provided with a lens holder 13 at a peripheral portion thereof for protecting the biaxial actuator 12. In addition, the peripheral wall portion 7 having a height at which the support body 20 and the like do not protrude is integrally formed in a frame shape. A projecting wall 7a having a height substantially equal to the highest elevation of the objective lens 11 is formed at a portion of the peripheral wall portion 7 corresponding to the objective lens 11 to protect the objective lens 11, and a flexible printed wiring is provided. The lead-out portion of the board 23 is formed with a vertical cut-out port 7b so that the wiring board 23 can be led out while being connected to the terminal portion 22 of the support 20, that is, in a vertical position. It is. Thereby, the flexible printed wiring board 23 can be led out without being twisted.
[0019]
Since the peripheral wall portion 7 is formed so as to protrude from the objective lens accommodating portion 3, each member of the biaxial actuator 12 comes into contact with another member when the slide base 2 moves in the direction along the guide shafts 68a and 68b. In addition, since the disk cartridge or the disk is prevented from hitting against the objective lens 11, the two-axis actuator 12 is protected without being covered by a cover. Thus, the actuator cover 25 that covers the objective lens housing 3 can be configured to only cover the peripheral edge. That is, as shown in FIG. 2, FIG. 4, and FIG. 6, the actuator cover 25 covers the substantially semi-peripheral edge of the objective lens housing 3 on the side opposite to the side where the objective lens 11 is located by a flat plate. Fitting portions 25a and 25b are formed at both ends and bent downward in a substantially U-shape to fit into the peripheral wall portion 5 of the objective lens housing portion 3. The outer piece portions of 25a and 25b are extended downward to form engagement pieces 25a ₁ and 25b ₁ having an engagement portion, and also have an engagement portion substantially at the center of the rear edge of the rear side portion. Gohen 25c is formed bent downward and adapted to be engaged with respect to the slide base 2 by the engagement piece _25a 1, 25b ₁ and 25c.
[0020]
Then, the actuator cover 25 with fitted fitting portion 25a in correspondence with the rear half portion of the objective lens housing portion 3, and 25b to the peripheral wall 7, the engagement piece _25a 1, 25b ₁ and 25c on the slide base 2 By the engagement, the periphery of the rear half of the objective lens housing 3 is covered, and the movable side of the biaxial actuator 12 is opened.
[0021]
Since the cover is not located on the movable portion of the biaxial actuator 12 in this manner, the height of this portion is reduced, the height of the optical pickup device 1 is reduced, and the moving space can be reduced. The apparatus and the magneto-optical disk recording / reproducing apparatus can be made smaller and thinner as a whole.
[0022]
The optical system housing 4 formed in the other half of the slide base 2 is open to the lower surface, opposite to the above-described objective lens housing 3, and is formed to communicate with the objective lens housing 3 from the other end surface. Have been.
[0023]
As shown in FIG. 3, the optical system housing 4 serves as an optical system member 30. A semiconductor laser 31 serving as a laser light source and an astigmatism correction plate (from the other end surface of the slide base 2 to the objective lens housing 3) are provided. A grating 33 incorporating an AS correction plate 32, a beam splitter 34, a collimator lens 35, and a prism mirror 36 corresponding to the objective lens 11 are arranged, and the beam splitter 34 is provided on one side of the slide base 2. A deflecting prism (Wollaston prism) 38 and a cylindrical lens (multi-lens) 39 are arranged on the side of the photodetector 37 to be attached.
[0024]
As shown in FIG. 7, the optical system member 30 configured as described above allows the laser beam emitted from the laser 31 to pass through the AS correction plate 32 and then passes through the beam splitter 34 to be converted into parallel light by the collimator lens 35. The light is converted, refracted by the prism mirror 36, narrowed down as a minute spot on the information recording surface on the disk D by the objective lens 11, and is incident. The reflected light from the information recording surface on the disk D returns along the same optical path as the incident light, passes through the deflection prism 38 and the cylindrical lens 39 from the beam splitter 34, and is guided to the photodetector 37. The signal is reproduced by capturing the change in the intensity of the reflected light.
[0025]
Also, when recording and reproducing this information, it is necessary that the laser spot always accurately catch the track on the disk even if the disk fluctuates. It is made to follow.
[0026]
The optical system member 30 configured as described above and housed in the optical system housing portion 4 of the slide base 2 is adhered and fixed with an adhesive and some of the members, that is, the beam splitter 34, the deflection prism 38, and the cylindrical lens 39 Is in contact with a shield plate 40.
[0027]
In this example, the hard printed wiring board 41 is fixed to the lower surface of the other half of the slide base 2 so as to close the opening of the optical system housing 4.
[0028]
A required wiring pattern 42 is formed on the hard printed wiring board 41, and a connector 43 for connecting a flexible wiring board for lead wiring is attached to the hard printed wiring board 41. The wiring pattern 42 has a land portion 42a as a required detection contact. , 42b, 42c are formed and exposed.
[0029]
Adjustment holes 45 and 46 for adjusting the optical system member 30 described above are formed in the hard printed wiring board 41, and one adjustment hole 45 is formed to be horizontally long so as to adjust the grading 33. The other adjustment hole 46 is formed in a circular shape and functions as a guide for an eccentric driver for adjusting the cylindrical lens 39.
[0030]
As described above, since the open portion of the optical system housing portion 4 of the slide base 2 is closed by the hard printed wiring board 41, the dustproof measures between the members of the optical system member 30 housed in the optical system housing portion 4 are almost complete. As a result, the optical system member 30 is reliably prevented from being damaged or dropped, and the optical path is always kept in a normal state.
[0031]
In addition, since the connector 43 is attached to the hard printed wiring board 41 and a flexible printed wiring board for lead wiring is connected to the hard printed wiring board 41, connection with an external circuit can be easily performed without any restrictions. .
[0032]
Also, since the land portions 42a, 42b, and 42c are formed on the wiring pattern 42 of the hard printed wiring board 41, a current for testing is supplied to the wiring pattern 42 by contacting a power supply terminal with the land portion 42a, and the objective lens 11 can be performed, and the operation inspection can be easily performed by bringing the detection terminals into contact with the lands 42b and 42c. In this case, each of the lands 42a, 42b and 42c is By being formed above, the contact of the power supply terminal, the detection terminal, and the like can be performed stably and reliably.
[0033]
Further, since the hard printed wiring board 41 is screwed to the slide base 2 with screws 47, the positioning can be accurately performed, the mounting can be performed reliably and easily, and the risk of inadvertent detachment or the like is eliminated.
[0034]
In this example, a rack member 51 to which a rotary screw shaft of a feed stepping motor is screwed as a feed mechanism 50 is attached to one end of the slide base 2 by a spring member 52 so as to be elastically attached to the rotary screw shaft. And the feeding force is stably transmitted.
[0035]
Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment. For example, as a support mechanism of the objective lens of the actuator, a hinge is used instead of the spring wire support type described above. Other structures, such as a hinge arm type constituted by an arm having a structure and a plate spring type using a plate spring, can be applied.
[0036]
In addition, the optical system is not limited to the above-described configuration, and other configurations may be applied.The slide base is die-cast from an aluminum alloy, but can be formed from other materials. The shape is not limited to the illustrated one.
[0037]
【The invention's effect】
According to the present invention, since the objective lens supported by the actuator and the optical member for the objective lens are disposed on one half side and the other half side of the slide base respectively, the thickness can be reduced. A frame-shaped peripheral wall portion that protects the actuator is provided on one half of the base, and the movable side of the actuator is opened so that the cover is not positioned so that the thickness can be reduced.
In addition, since the open side of the lower surface of the housing portion in which the optical system member of the other half of the slide base is housed is closed by the printed circuit board, the optical system member is protected by this printed circuit board and assembled. In such cases, contamination by fingers and the like is prevented, and dust is prevented between optical system members, so that an optical path can be always maintained in a normal state. Thus, reproduction of an optical disk and recording / reproduction of a magneto-optical disk are reliably performed, and reliability is improved. The performance is improved.
[0038]
Further, the optical pickup device of the present invention has an adjustment hole for adjusting the optical system member formed on the printed wiring board fixed to the lower surface side of the slide base, so that it is necessary to adjust the optical system member after assembly. Further, the optical member can be adjusted by passing the adjusting tool through the adjusting hole from the lower surface side of the slide base while irradiating the optical disk with the laser beam.
[Brief description of the drawings]
FIG. 1 is a perspective view of an example of an objective lens actuator portion of an optical pickup device according to the present invention.
FIG. 2 is a perspective view of an actuator cover attached to the objective lens actuator shown in FIG.
FIG. 3 is an exploded perspective view of an example of an optical system portion of the optical pickup device according to the present invention.
FIG. 4 is a plan view of an example of an optical pickup device according to the present invention.
5 is a bottom view of the optical pickup device shown in FIG.
FIG. 6 is a right side view of the optical pickup device shown in FIG.
FIG. 7 is an optical path diagram of an example of an optical pickup device according to the present invention.
FIG. 8 is a perspective view of a conventional magneto-optical head device with a part thereof separated.
[Explanation of symbols]
2 slide base, 3 objective lens accommodating section, 4 optical system member accommodating section, 7 peripheral wall section, 7a protruding wall, 7b outlet, 11 objective lens, 12 biaxial actuator, 13 lens holder, 20 support, 22 terminal section, 25 Actuator cover, 30 Optical member, 41 Hard printed wiring board, 42 Wiring pattern, 42a, 42b, 42c Land, 43 Connector

Claims (3)

An optical pickup device in which an objective lens supported by an actuator is arranged on one half of the slide base, and an optical system member for the objective lens is arranged on the other half.
A frame-shaped peripheral wall portion for protecting the actuator is provided on the one half side of the slide base and the movable side of the actuator is opened,
The printed circuit board on which a required wiring pattern is formed is closed so as to close the open side of the lower surface of the housing portion for housing the optical system member on the other half of the slide base. An optical pickup device fixed to the lower surface side of the unit , wherein an adjustment hole for adjusting the optical system member is formed in the printed wiring board. The optical pickup device according to claim 1,
The optical pickup device, wherein the adjustment hole is a guide hole of an adjustment tool for adjusting the optical system member. An optical recording and reproducing apparatus including an optical pickup device that performs recording and reproduction by irradiating light to an optical recording medium,
The optical pickup device,
An optical pickup device comprising: an objective lens supported by an actuator disposed on one half of a slide base; and an optical system member for the objective lens disposed on the other half of the slide base , wherein the actuator is disposed on the one half of the slide base. And a movable side of the actuator is opened to protect the optical system member of the other half of the slide base so as to close an open side of a lower surface of a housing portion in which the optical system member is housed. A printed wiring board on which a required wiring pattern is formed is fixed to the lower surface of the other half of the slide base, and an adjustment hole for adjusting the optical system member is formed in the printed wiring board. An optical recording / reproducing apparatus, characterized by comprising

Images