JP3748265B2 - Optical pickup - Google Patents

Description

The present invention relates to an optical pickup used in a disc player such as a DVD or a CD,
In particular, the movable magnet, the objective lens, and the printed circuit board are precisely positioned as specified with an inexpensive and simple structure.

Conventionally, there are optical pickup technologies described in Patent Document 1 and the like, and examples thereof are shown in FIGS. 9 to 11. This is because the support member 2 is placed on one end of the act base 1.
The lens holder 4 with the objective lens OL is disposed so as to face the support member 2, and the yoke 5 is inserted into a pair of yoke holes 4 a penetrating at both ends of the lens holder 4. A focus coil 6, a tracking coil 7, and a tilt coil 8 are arranged, a fixed magnet 9 is fixed on the other end of the act base 1 close to the lens holder 4, and the lens holder 4 is attached to the fixed magnet 9. A pair of columnar positioning pins 12a, which are fixed to a substantially L-shaped magnet holder 11 slidably disposed on the act base 1 and projecting on the lower surface of the magnet holder 11, 12b is inserted into a pair of circular positioning holes 13a and 13b penetrating the act base 1, and a plurality of electrode holes 15a are penetrating at both ends. The lint substrate 15 is in contact with the end surface 2b of the support member 2 and passes through the plurality of substrate holes 15b penetrating through the central portion of the printed circuit board 15 and the through holes 2c of the support member 2 to the screw holes 11b of the magnet holder 11. By screwing a plurality of board screws 16 (see FIGS. 11A and 11B), the printed board 15 is fixed to the end surface 2b of the support member 2, and the support member 2 and the magnet holder 11 are connected to each other. One end of a plurality of elastic wires 3 that are integrally connected (see FIGS. 11 (c) and 11 (d)) and penetrates both ends of the support member 2 are soldered to the lens holder 4, and the other end of each elastic wire 3 The lens holder 4 is connected to the support member 2 via the elastic wires 3 and is inserted into the magnet holder 11 by inserting the soldering part 17 into the electrode holes 15a of the printed board 15 (see FIG. 9). Through the holder hole 11a by screwing the holder screw member 14 into the holder hole 11a and concentric threaded hole 1a was [1
0 (a) and (b)], the magnet holder 11 is fixed to the act base 1 (see FIGS. 10C and 10D).

In the above configuration, the lens holder 4 is moved in the focus direction a, b, the tracking direction c, d and / or the tilt direction e, f by energizing the coils 6-8 from the printed board 15 through the elastic wires 3. The laser light is projected onto a disk (not shown) through the objective lens OL, and the reflected light is received to read the information recorded on the disk.
Japanese Patent Laid-Open No. 2001-20642

10A and 10B, when the magnet holder 11 is fastened to the act base 1 with the holder screw 14, the head 14a of the holder screw 14 is moved as shown in FIGS. As shown in FIGS. 10C and 10D, the magnet holder 11 is pushed by the gap α between the positioning holes 13a and 13b and the positioning pins 12a and 12b fitted therein, as shown in FIGS. The movable magnet 10 and the objective lens OL are misaligned, and it may be difficult to precisely perform focusing, tracking, and tilting movements.

11A and 11B, when the printed board 15 is fixed to the end surface 2b of the support member 2 with the board screw 16, the head 16a of the board screw 16 is printed. Board 15
11 (c) and 11 (d), the printed board 15 is easily tilted and fixed by the gap β between the board hole 15b and the board screw 16 as shown in FIGS. The positional relationship between each electrode hole 15a of the printed circuit board 15 and each elastic wire 3 is shifted, which may make it difficult to precisely perform focusing, tracking, and tilting movements.

Although the technique which eliminates the said fault is disclosed by patent document 1 etc., all have a complicated structure and manufacturing cost will be expensive.

An object of the present invention is to provide an optical pickup capable of accurately positioning a movable magnet, an objective lens, and a printed circuit board in a predetermined manner with an inexpensive and simple structure in view of the above-described conventional drawbacks.

In order to achieve the above object, according to the first aspect of the present invention, a support member is disposed on one end of the act base, and a focus coil, a tracking coil, and a tilt coil are mounted on the lens holder with an objective lens facing the support member. The fixed magnet is fixed on the other end of the act base close to the lens holder, and the movable magnet facing the fixed magnet with the lens holder in between is slidable on the act base. A printed circuit board is fixed to the magnet holder, and a pair of positioning pins projecting from the lower surface of the magnet holder are respectively fitted into a pair of positioning holes penetrating the act base, and a plurality of electrode holes are penetrated at both ends. The magnet is in contact with the end surface of the support member and passes through a plurality of substrate holes penetrating the central portion of the printed circuit board and the through holes of the support member. The printed board is fixed to the end surface of the support member by screwing a plurality of board screws into the screw holes of the grid holder, and the support member and the magnet holder are integrally connected to penetrate both ends of the support member. While soldering one end of a plurality of elastic wires to the lens holder and inserting the other end of each elastic wire into each electrode hole of the printed circuit board and soldering, the support member is interposed via each elastic wire. The lens holder is connected and the magnet holder is fixed to the act base by screwing the holder screw into the screw hole of the act base concentric with the holder hole through the holder hole penetrating the magnet holder. By energizing the coils from the printed circuit board through the elastic wires, the lens holder can be focused, tracked and / or In the optical pickup that is moved in the direction of the vertical direction, a vertical reference plane along the vertical reference line and a horizontal reference plane along the horizontal reference line orthogonal to the vertical reference line are formed on the inner peripheral surface of the one positioning hole. A horizontal reference plane is formed along the horizontal reference line on the inner peripheral surface of the other positioning hole, and the holder hole is larger in diameter than the screw hole of the act base and is eccentric with respect to the screw hole by a predetermined distance. A countersunk screw is used as the holder screw, and the peripheral edge of the holder hole is pressed with the inclined bottom surface of the head of the countersunk screw for the holder,
With the pressing force, one positioning pin is pressed against the vertical reference plane and the horizontal reference plane of one positioning hole, and the other positioning pin is pressed against the horizontal reference plane of the other positioning hole with the pressing force. The objective lens is positioned at a predetermined position on the act base, a reference protrusion is provided along the horizontal reference line at the upper end of the end surface of the support member, and only one substrate hole is provided at the center of the printed circuit board. The substrate hole is larger in diameter than the screw hole of the support member and is eccentric with respect to the screw hole by a predetermined distance, and a countersunk screw is used as the substrate screw tool. Check that the printed circuit board is fixed at a predetermined position on the end surface of the support member by pressing the peripheral edge of the substrate hole with the inclined surface of the head and pressing the upper edge of the printed circuit board against the reference protrusion with the pressing force. It is a symptom.

According to the second aspect of the present invention, a support member is disposed on one end portion of the act base, and a focus coil and a tracking coil are disposed on a lens holder with an objective lens facing the support member, and the actuator is close to the lens holder. A fixed magnet is fixed on the other end of the act base, and a movable magnet facing the fixed magnet with a lens holder in between is fixed to a magnet holder slidably disposed on the act base, A printed circuit board having a plurality of electrode holes is fixed to the end surface of the support member, and the support member and the magnet holder are integrally connected, and one end portion of the plurality of elastic wires penetrating both end portions of the support member is provided. By soldering to the lens holder and inserting the other end of each elastic wire into each electrode hole of the printed circuit board and soldering, the support portion To the lens holder connected via a respective elastic wires, by supplying current from the printed circuit board to the coils via the respective elastic wires, in the optical pickup so as to move the lens holder focusing and or in the direction of tracking,
A pair of positioning holes for inserting a pair of positioning pins projecting from the lower surface of the magnet holder are provided in the act base, and a vertical reference surface along the vertical reference line is formed on the inner peripheral surface of the one positioning hole. A screw formed on the act base is formed with a horizontal reference surface along a horizontal reference line perpendicular to the vertical reference line and a horizontal reference surface along the horizontal reference line formed on the inner peripheral surface of the other positioning hole. A holder hole that is larger in diameter than the hole and is eccentric with respect to the screw hole by a predetermined distance is penetrated in the magnet holder, and the head inclined surface of the countersunk head screw screwed into the screw hole through the holder hole The peripheral edge of the holder hole is pressed with one pressing pin against the vertical reference plane and the horizontal reference plane of one positioning hole with the pressing force, and the other positioning pin is pressed against the other positioning hole with the pressing force. On the horizontal reference plane By then attaching the movable magnet and the objective lens is characterized in that so as to be positioned at a predetermined position on the actuator base.

According to a third aspect of the present invention, in the second aspect of the present invention, a reference protrusion is provided along the horizontal reference line at the upper end of the end surface of the support member, and is formed at the center of the end surface of the support member. A screw hole that is concentric with the through hole is formed in the magnet holder, and a substrate hole that is larger in diameter than the screw hole and eccentric with a predetermined interval with respect to the screw hole is provided in the center of the printed circuit board. The peripheral edge of the substrate hole is pressed by the inclined surface of the head of the countersunk head screw screwed into the screw hole through the substrate hole and the through hole, and the upper edge of the printed circuit board is used as a reference protrusion by the pressing force. By pressing, the printed circuit board is fixed to a predetermined position on the end surface of the support member.

The invention described in claim 1 corresponds to one embodiment (see FIGS. 1 to 8),
According to this, just by fixing the magnet holder to the act base with the countersunk screw for the holder, the peripheral part of the holder hole is pressed by the inclined surface of the head of the countersunk head for the holder, and one positioning pin is used by the pressing force. Is pressed against the vertical reference plane and horizontal reference plane of one positioning hole, and the other positioning pin is pressed against the horizontal reference plane of the other positioning hole with the pressing force, so that the position of the movable magnet and the objective lens is set appropriately. Focus, tracking and / or tilt movements can be performed precisely.

What is important here is that the holder hole has a larger diameter than the screw hole of the act base and is eccentric with respect to the screw hole by a predetermined distance, and only a countersunk screw is used as a screw for the holder. It is only necessary to change the existing structure slightly, and the production cost can be reduced.

In addition, just by fixing the printed circuit board to the end face of the support member with the countersunk screw for the circuit board, the peripheral edge of the substrate hole is pressed with the inclined bottom surface of the head of the countersunk board screw, and the upper edge of the printed circuit board is pressed by the pressing force By pressing against the reference protrusion of the support member, the positional relationship between each electrode hole of the printed circuit board and each elastic wire can be set appropriately, and the movement of focus, tracking and / or tilt can be performed precisely.

What is important here is that the substrate hole is larger in diameter than the screw hole of the support member and is eccentric with respect to the screw hole by a predetermined distance, and a countersunk screw is only used as a screw for the substrate. ,
It is only necessary to change the existing structure slightly, and the production cost can be reduced.

According to the second aspect of the present invention, by simply fixing the magnet holder to the act base with the countersunk screw for the holder, the peripheral edge of the holder hole is pressed with the inclined bottom surface of the head of the countersunk screw for the holder, With pressure, one positioning pin is pressed against the vertical reference plane and the horizontal reference plane of one positioning hole, and the other positioning pin is pressed against the horizontal reference plane of the other positioning hole with the pressing force. The position can be set appropriately, and the focus and / or tracking movement can be performed precisely.

What is important here is that the holder hole has a larger diameter than the screw hole of the act base and is eccentric with respect to the screw hole by a predetermined distance, and only a countersunk screw is used as a screw for the holder. It is only necessary to change the existing structure slightly, and the production cost can be reduced.

According to the third aspect of the present invention, the peripheral edge of the substrate hole is pressed with the inclined bottom surface of the head of the countersunk screw by simply fixing the printed circuit board to the end surface of the support member with the countersunk screw for the substrate, and the pressing force thereof By pressing the upper edge of the printed circuit board against the reference protrusion of the support member, the positional relationship between each electrode hole of the printed circuit board and each elastic wire can be set appropriately, and the focusing and / or tracking movement can be performed precisely. .

What is important here is that the substrate hole is larger in diameter than the screw hole of the support member and is eccentric with respect to the screw hole by a predetermined distance, and a countersunk screw is only used as a screw for the substrate. ,
It is only necessary to change the existing structure slightly, and the production cost can be reduced.

1 to 3 show an optical pickup according to an embodiment of the present invention. A holder screw for fixing a magnet holder 11 to an act base 1 and a printed circuit board 1 are shown.
As a board screw for fixing 5 to the end surface 2b of the support member 2, a countersunk screw 19,
20 is used. Since the configuration other than the above is substantially the same as the configuration shown in FIGS. 9 to 11, the same reference numerals are given to the same portions and the description thereof is omitted.

As shown in FIGS. 4 and 5, both positioning holes 13a and 13b of the act base 1 are formed in a substantially square shape, and the vertical reference surface 13A along the vertical reference line g is formed on the inner peripheral surface of the one positioning hole 13a. And a horizontal reference plane 13B along a horizontal reference line h orthogonal to the vertical reference line g,
A horizontal reference surface 13C along the horizontal reference line h is formed on the inner peripheral surface of the other positioning hole 13b.

As shown in FIGS. 4 and 5, the holder hole 11 a of the magnet holder 11 serves as the act base 1.
The screw hole 1a has a diameter larger than that of the screw hole 1a. The shaft center O1 of the screw hole 1a and the positioning holes 13a, 1
Holder hole 11a along an imaginary line S3 passing through substantially the center between both imaginary lines S1 and S2 connecting 3b.
The positioning pin 12a, 1 is positioned at a predetermined interval t1 with respect to the axial center O2 of the screw hole 1a.
It is eccentric so as to be separated from 2b.

The procedure for positioning the movable magnet 10 and the objective lens OL will be described with reference to FIGS.
), The holder countersunk screw 19 is screwed into the screw hole 1a through the holder hole 11a,
As shown in FIGS. 5 (c) and 5 (d), the holder hole 1
1a is pressed, and one positioning pin 12a is pressed against the vertical reference plane 13A and the horizontal reference plane 13B with a component force F1 along the virtual line S1 of the pressing force F, and against the virtual line S2 of the pressing force F The other positioning pin 12b is pressed against the lateral reference surface 13C with the component force F2 along. Thereby, the movable magnet 10 and the objective lens OL are positioned at predetermined positions on the act base 1.

According to the above configuration, just by fixing the magnet holder 11 to the act base 1 with the countersunk screw 19 for the holder, the peripheral part of the holder hole 11a is pressed by the head inclined lower surface 19a of the countersunk screw 19 for the holder, The positioning pin 12a is pressed against the vertical reference surface 13A and the horizontal reference surface 13B of one positioning hole 13a by the component force F1 of the pressing force F, and the other positioning pin 12b is pressed to the other positioning hole by the component force F2 of the pressing force F. The position of the movable magnet 10 and the objective lens OL can be set appropriately by pressing against the horizontal reference surface 13C of 13b, and the movement of focus, tracking and / or tilt can be performed precisely.

What is important here is that the holder hole 11a has a larger diameter than the screw hole 1a of the act base 1 and is eccentric with respect to the screw hole 1a by a predetermined interval t1.
Since only is used, it is only necessary to slightly change the existing structure, and the production cost can be reduced.

FIG. 6 shows a modification of the positioning procedure of the movable magnet 10 and the objective lens OL. Both positioning holes 13a and 13b are arranged opposite to each other with the horizontal reference line h in between, and both virtual lines S are arranged.
1 and S2 intersect at about 45 °, and the axis O2 of the holder hole 11a passes through the axis O1 and is along the imaginary line S4 orthogonal to the one imaginary line S1, with respect to the axis O1 of the screw hole 1a. Are eccentric so as to be separated by a predetermined interval t1.

The procedure for positioning the movable magnet 10 and the objective lens OL will be described with reference to FIGS.
), The holder countersunk screw 19 is screwed into the screw hole 1a through the holder hole 11a,
As shown in FIGS. 6 (c) and 6 (d), the holder hole 1
1a is pressed, one positioning pin 12a is pressed against the vertical reference plane 13A with a component force F1 parallel to the horizontal reference line h of the pressing force F, and parallel to the vertical reference line g of the pressing force F. One positioning pin a12a is pressed against the horizontal reference plane 13B by the component force F2, and at the same time, the other positioning pin 12b is pressed against the horizontal reference plane 13C. Thereby, the movable magnet 10 and the objective lens OL are positioned at predetermined positions on the act base 1.

  According to the above configuration, substantially the same effect as the configuration shown in FIG. 5 can be obtained.

As shown in FIGS. 7 and 8, the reference protrusion 2 along the horizontal reference line i is formed on the end surface 2 b of the support member 2.
2 is protruded over the entire width of the support member 2, and only one substrate hole 15 b is formed through the central portion of the printed circuit board 15, and the substrate hole 15 b is opposed to the through hole 2 c of the support member 2. It is formed with a diameter larger than that of the screw hole 11b (see FIG. 2) of the holder 11, and the substrate hole 1
The shaft center O4 of 5b is decentered downward by a predetermined interval t2 with respect to the shaft center O3 of the screw hole 11b. In FIG. 7, reference numeral 2a denotes a recess for inserting the elastic wire 3 provided at both ends of the support member 2, and the recess 2a is filled with a vibration absorbing elastic damper 23.

The fixing procedure of the printed circuit board 15 will be described. As shown in FIGS.
The countersunk screw 20 for board | substrates is screwed in the screw hole 11b through 5b and the through-hole 2c, and FIG.8 (c) (
As shown in d), the peripheral edge portion of the substrate hole 15 b is pressed by the head inclined lower surface 20 a of the substrate countersunk screw 20, and the upper end of the printed circuit board 15 is pressed against the reference protrusion 22 by the pressing force F. As a result, the printed circuit board 15 is fixed to a predetermined position on the end surface 2 b of the support member 2.

According to the above configuration, just by fixing the printed circuit board 15 to the end surface 2b of the support member 2 with the countersunk screw 20 for the substrate, the peripheral edge of the substrate hole 15b is pressed by the head inclined lower surface 20a of the countersunk screw 20, The upper edge of the printed circuit board 15 is pressed against the reference protrusion 22 of the support member 2 by the pressing force F, the positional relationship between each electrode hole 15a of the printed circuit board 15 and each elastic wire 3 is set appropriately, focus,
Tracking and / or tilt movement can be performed precisely.

What is important here is that the substrate hole 15b has a larger diameter than the through hole 2c of the support member 2, and the through hole 2
Since it is decentered by a predetermined interval t2 with respect to c and only the countersunk screw 20 is used as the board screw tool, it is only necessary to slightly change the existing structure, thereby reducing the manufacturing cost. it can.

In the above embodiment, the optical pickup in which the lens holder 4 is provided with the three coils 6 to 8 is shown. However, the present invention is not limited to this, and the tilt coil 8 is omitted, and the lens holder 4 has the focus coil 6 and the focus coil 6. The present invention is also applied to an optical pickup provided with a tracking coil 7.

It is a top view of the optical pick-up which is one Embodiment of this invention. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. It is a disassembled perspective view of magnet holder vicinity. (A) is a schematic plan view showing the first half of the positioning procedure of the movable magnet and the objective lens, (b) is a CC arrow view, (c) is a schematic plan view showing the second half of the procedure, (d) is D FIG. (A) is a schematic plan view showing the first half of a modified example of the positioning procedure of the movable magnet and the objective lens, (b) is a view taken along the line EE, (c) is a schematic plan view showing the second half of the procedure, (d ) Is a GG arrow view. It is a disassembled perspective view of printed circuit board vicinity. (A) is a schematic plan view showing the first half of the printed circuit board fixing procedure, (b) is a view taken in the direction of arrows H-H, (c) is a schematic plan view showing the second half of the procedure, and (d) is II. It is an arrow view. It is a perspective view which shows a prior art example. (A) is a schematic plan view showing the first half of the positioning procedure of the movable magnet and the objective lens, (b) is a JJ arrow view, (c) is a schematic plan view showing the second half of the procedure, (d) is K FIG. (A) is a schematic plan view showing the first half of the printed circuit board fixing procedure, (b) is a view taken along the line LL, (c) is a schematic plan view showing the second half of the procedure, and (d) is MM. It is an arrow view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Act base 1a Screw hole of act base 2 Support member 2b End surface of support member 2c Through hole of support member 3 Elastic wire 4 Lens holder 6 Focus coil 7 Tracking coil 8 Tilt coil 9 Fixed magnet 10 Movable magnet 11 Magnet holder 11a Magnet holder Holder hole 11b Magnet holder screw hole 12a, 12b Positioning pin 13a, 13b Positioning hole 13A Vertical reference surface 13B Horizontal reference surface 13C Horizontal reference surface 15 Printed circuit board 15b Printed circuit board hole 17 Soldering 19 Countersunk screw 19a for holder Countersunk head of slanted head of head screw 20 Countersunk head screw of substrate 20a Tilted bottom surface of head of countersunk head screw 22 Reference protrusion g Vertical reference line h Horizontal reference line i Horizontal reference line t1 interval t2 interval

Claims (3)

A support member is disposed on one end of the act base, and a focus coil, a tracking coil, and a tilt coil are disposed on the lens holder with an objective lens facing the support member, and the other end of the act base approaches the lens holder. A fixed magnet is fixed on the part, and a movable magnet facing the fixed magnet with a lens holder in between is fixed to a magnet holder slidably disposed on the act base and protruded from the lower surface of the magnet holder A pair of positioning pins are respectively fitted into a pair of positioning holes penetrating the act base, and a printed circuit board having a plurality of electrode holes penetrating both ends is brought into contact with the end surface of the support member,
The printed board is fixed to the end surface of the support member by screwing a plurality of board screws into the screw holes of the magnet holder through the plurality of board holes penetrating the central portion of the printed board and the through hole of the support member. At the same time, the support member and the magnet holder are integrally connected, and one end of a plurality of elastic wires penetrating both ends of the support member is soldered to the lens holder, and the other end of each elastic wire is printed. The lens holder is connected to the support member via each elastic wire by being inserted into each electrode hole of the substrate and soldered, and the act base is concentric with the holder hole through the holder hole penetrating the magnet holder. By screwing the holder screw into the screw hole, the magnet holder is fixed to the act base, and each of the above-mentioned cores is connected from the printed circuit board through each elastic wire. In the optical pickup in which the lens holder is moved in the focus, tracking, and / or tilt directions by energizing the cable, the vertical reference line along the vertical reference line and the vertical reference line on the inner peripheral surface of the one positioning hole And a horizontal reference plane along the horizontal reference line is formed on the inner peripheral surface of the other positioning hole, and the holder hole is an act base screw hole. And a countersunk screw is used as the holder screw, and the peripheral edge of the holder hole is pressed by the inclined bottom surface of the head of the countersunk screw for the holder. The pressing force causes one positioning pin to be pressed against the vertical reference plane and the horizontal reference plane of one positioning hole, and the other positioning pin is pressed against the horizontal reference plane of the other positioning hole with the pressing force. Accordingly, the movable magnet and the objective lens are positioned at predetermined positions on the act base, the reference protrusion is provided along the horizontal reference line at the upper end of the end surface of the support member, and the substrate hole is formed at the center of the printed circuit board. The substrate hole is larger in diameter than the screw hole of the support member and is eccentric with respect to the screw hole by a predetermined distance, and a countersunk screw is used as the board screw tool, By pressing the peripheral edge of the board hole with the inclined bottom surface of the head of the countersunk board screw and pressing the upper edge of the printed board against the reference ridge with the pressing force, the printed board is fixed at a predetermined position on the end face of the support member An optical pickup characterized by being made. A support member is disposed on one end of the act base, and a focus coil and a tracking coil are disposed on a lens holder with an objective lens facing the support member,
A fixed magnet is fixed on the other end of the act base close to the lens holder, and a movable magnet facing the fixed magnet with the lens holder interposed therebetween is slidably disposed on the act base. A printed circuit board that is fixed and has a plurality of electrode holes penetrating at both ends is fixed to the end surface of the support member, and the support member and the magnet holder are integrally connected to each other, and a plurality of through the both end portions of the support member are penetrated. While soldering one end of the elastic wire to the lens holder, the other end of each elastic wire is inserted into each electrode hole of the printed circuit board and soldered, so that the lens holder is connected to the support member via each elastic wire. Are connected to each other and each coil is energized from the printed circuit board through each elastic wire to thereby focus and / or track the lens holder. In the optical pickup that is moved in the direction, a pair of positioning holes for fitting a pair of positioning pins protruding from the lower surface of the magnet holder are provided in the act base, and the inner peripheral surface of one of the positioning holes A vertical reference plane along the vertical reference line and a horizontal reference plane along a horizontal reference line orthogonal to the vertical reference line are formed, and a horizontal reference plane along the horizontal reference line is formed on the inner peripheral surface of the other positioning hole. A holder hole having a diameter larger than that of the screw hole formed in the act base and deviating from the screw hole by a predetermined distance is penetrated through the magnet holder, and is screwed into the screw hole through the holder hole. Press the peripheral edge of the holder hole with the inclined bottom surface of the head of the countersunk screw for the holder, and press one positioning pin against the vertical and horizontal reference planes of the positioning hole with the pressing force. other By pressing the positioning pins next to the reference surface of the other positioning hole, the optical pickup, wherein the movable magnet and the objective lens has to be positioned at a predetermined position on the actuator base. A reference protrusion is provided along the horizontal reference line at the upper end of the end surface of the support member, and a screw hole concentric with a through hole formed in the center of the end surface of the support member is provided in the magnet holder. A substrate hole having a diameter larger than that of the screw hole and decentered by a predetermined interval with respect to the screw hole is provided in the center of the printed circuit board, and is used for a substrate screwed into the screw hole through the substrate hole and the through hole. By pressing the peripheral edge of the board hole with the inclined bottom of the head of the countersunk screw and pressing the upper edge of the printed board against the reference ridge with the pressing force, the printed board is fixed at a predetermined position on the end surface of the support member. The optical pickup according to claim 2, wherein the optical pickup is provided.

Images