JP4032554B2 - Optical pickup - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical pickup.
[0002]
[Prior art]
An optical pickup is mounted on various optical disk devices such as a CD-ROM drive installed in a personal computer or the like.
[0003]
The optical pickup has a pickup base, and a substrate (PD substrate) on which a photodiode is mounted is installed on the pickup base.
[0004]
The PD substrate is attached with members such as three screws, a photodiode holder, a photodiode spring, and a photodiode cover.
[0005]
However, in the conventional optical pickup, the PD substrate is attached by a very large number of members, and when the PD substrate is attached, it is necessary to screw three places. Takes time and takes a long time.
[0006]
In addition, when the PD substrate is attached, the position and orientation of the photodiode (PD substrate) are adjusted. However, since there are three screwed locations, the adjustment is troublesome and requires a long time. Cost.
[0007]
[Problems to be solved by the invention]
An object of the present invention is to provide an optical pickup having a small number of parts, a simple structure, and an easy assembling operation.
[0008]
[Means for Solving the Problems]
Such an object is achieved by the present inventions (1) to (7) below.
[0009]
(1) having a substrate on which an optical element is provided and a pickup base on which the substrate is installed;
The pickup base is provided with engagement means for engaging with a part of the substrate,
An optical pickup in which a portion of the substrate is engaged with the engagement means and the substrate is fixed to the pickup base at a position spaced a predetermined distance from the engagement location,
The engagement means is formed integrally with the pickup base, and a first engagement piece and a second engagement piece that engage with a surface of the substrate opposite to the pickup base;
And at least one protrusion formed integrally with the pickup base and positioned between the first engagement piece and the second engagement piece and contacting the surface of the substrate on the pickup base side. And
The first engagement piece and the second engagement piece respectively engage with a surface of the substrate opposite to the pickup base, and the protrusion contacts the surface of the substrate on the pickup base side. An optical pickup, wherein the substrate is fixed to the pickup base at the other end side in a state where the substrate is in contact with one end side of the substrate and thereby supported by the pickup base.
[0010]
(2) The optical pickup according to (1), wherein the optical element is a light receiving element that receives reflected light from an optical disk.
[0011]
(3) an actuator in which an objective lens that collects reflected light from the optical disk is installed in the movable part;
An actuator base for supporting the actuator;
A pickup base that supports the actuator base and is reciprocally movable along a guide rod;
A substrate on which a light receiving element that receives light collected by the objective lens is mounted on a side opposite to the actuator base of the pickup base or on a side portion of the pickup base;
The pickup base is provided with engagement means for engaging with a part of the substrate,
An optical pickup in which a portion of the substrate is engaged with the engagement means and the substrate is fixed to the pickup base at a position spaced a predetermined distance from the engagement location,
The engagement means is formed integrally with the pickup base, and a first engagement piece and a second engagement piece that engage with a surface of the substrate opposite to the pickup base;
And at least one protrusion formed integrally with the pickup base and positioned between the first engagement piece and the second engagement piece and contacting the surface of the substrate on the pickup base side. And
The first engagement piece and the second engagement piece respectively engage with a surface of the substrate opposite to the pickup base, and the protrusion contacts the surface of the substrate on the pickup base side. An optical pickup, wherein the substrate is fixed to the pickup base at the other end side in a state where the substrate is in contact with one end side of the substrate and thereby supported by the pickup base.
[0012]
(4) The optical pickup according to any one of (1) to (3), wherein a plurality of the protrusions are provided separated by a predetermined distance.
[0013]
(5) The optical pickup according to any one of (1) to (4), wherein the substrate is disposed so as to be exposed outside the pickup base.
[0014]
(6) The substrate is installed on the bottom surface of the pickup base,
Each of the first engagement piece and the second engagement piece is an engagement claw integrally formed on the bottom surface side of the pickup base, according to any one of (1) to (5). Optical pickup.
[0015]
(7) The optical pickup according to any one of (1) to (6), wherein the substrate is fixed to the pickup base by screws.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an optical pickup of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
[0018]
1 and FIG. 2 are perspective views showing a first embodiment of the optical pickup of the present invention, and FIG. 3 is a side view showing an engaging means and a substrate of the optical pickup shown in FIGS.
[0019]
As shown in these drawings, an optical pickup (optical head) 1 includes a pickup base (optical base) 2, an actuator base 3, a damper base 4, an actuator 5, and four suspension wires (suspension springs) 7. And have.
[0020]
The pickup base 2 has a space (not shown) in which the lower part of the actuator base 3 and the damper base 4 is housed at the center thereof, and an optical disk device (recording and / or recording an optical disk) at each of both ends. Guide portions 28 and 29 are formed to be engaged with guide rods (not shown) installed in the reproducing apparatus.
[0021]
The pickup base 2 is installed so that the guide portions 28 and 29 engage with corresponding guide rods, respectively, and can reciprocate in the radial direction of the optical disk along these guide rods.
[0022]
In the present invention, the optical disk means a normal optical disk (narrowly defined optical disk) such as a CD, CD-ROM, CD-R, CD-RW, DVD, DVD-ROM, DVD-R, DVD-RAM, etc. It is a concept that includes a magnetic disk.
[0023]
The actuator base 3 and the damper base 4 are integrally formed. The integrated body of the actuator base 3 and the damper base 4 is supported by the pickup base 2 with its lower part housed in the space of the pickup base 2.
[0024]
The actuator 5 includes a fixed part 5a and a movable part 5b.
[0025]
The fixed portion 5 a is composed of a yoke 51 and a permanent magnet 52 joined to the yoke 51, and these are fixedly supported by the actuator base 3.
[0026]
On the other hand, the movable portion 5 b of the actuator 5 includes a lens holder 53 having a lens support portion 531 and a coil support portion, an objective lens (condensing lens) 54 supported by the lens support portion 531 of the lens holder 53, and the lens holder 53. The tracking coil 55 and the focusing coil 56 are wound around the coil support portion.
[0027]
The movable portion 5b is supported by the damper base 4 through four suspension wires 7 so as to be displaceable. The suspension wire 7 functions as an electric wire (conductor) for energizing the tracking coil 55 and the focusing coil 56.
[0028]
By energizing the tracking coil 55, the objective lens 54 (movable part 5b) moves in the radial direction (tracking direction) of the optical disk, and by energizing the focusing coil 56, the objective lens 54 (movable part 5b) becomes the objective lens. 54 moves in the optical axis direction (focusing direction).
[0029]
A laser diode (light emitting portion) (not shown) that emits laser light to be applied to the optical disk is installed at a predetermined position on the lower side in FIG. 1 of the actuator base 3 of the pickup base 2 described above.
[0030]
As shown in FIG. 2, the substrate 8 is disposed on the opposite side of the pickup base 2 from the actuator base 3, that is, on the bottom surface 21 of the pickup base 2 so as to be exposed to the outside of the pickup base 2.
[0031]
A photodiode (light receiving element) 9 that receives reflected light from the optical disk is mounted on the substrate 8. The light receiving surface of the photodiode 9 faces the objective lens 54 side (lower side in FIG. 2).
[0032]
At the position corresponding to the photodiode 9 of the pickup base 2, there is a hole (opening) (not shown) having one end communicating with the space in which the lower portion of the damper base 4 is accommodated and the other end opened to the bottom surface 21. Is formed. The reflected light from the optical disk passes through this hole and reaches the light receiving surface of the photodiode 9.
[0033]
Further, as shown in FIGS. 2 and 3, at the corners of both ends of the side 211 of the bottom surface 21, a substantially L-shaped first engagement claw (first engagement) that engages with the end of the substrate 8 is provided. A combination piece) 22 and a second engagement claw (second engagement piece) 23 are erected toward the side opposite to the actuator base 3 (upper side in FIG. 3). The engaging claws 22 and 23 are formed integrally with the pickup base 2, respectively.
[0034]
Further, a projection 24 that contacts the end of the substrate 8 is provided on the opposite side of the actuator base 3 between the engaging claw 22 and the engaging claw 23 of the bottom surface 21, that is, at the center of the side 211 of the bottom surface 21 (see FIG. (Upper middle of 3). The protrusion 24 is formed integrally with the pickup base 2.
[0035]
One end side of the substrate 8 is supported by the engaging claws 22 and 23 and the protrusion 24 arranged on the same straight line. That is, the engaging claws 22 and 23 are respectively engaged with the surface 81 of the substrate 8 opposite to the actuator base 3 (pickup base 2), and the protrusion 24 is on the actuator base 3 (pickup base 2) side of the substrate 8. Accordingly, one end side of the substrate 8 is supported by the pickup base 2.
[0036]
The engaging claws 22 and 23 and the protrusions 24 constitute engaging means.
[0037]
Further, the substrate 8 is screwed to the pickup base 2 on the other end side (a position separated from the engaging portion by a predetermined distance) with one end side supported by the pickup base 2.
[0038]
As shown in FIG. 2, a position corresponding to a later-described screw hole (female screw) 25 of the substrate 8, that is, an end opposite to a portion of the substrate 8 that is supported by the engagement claws 22 and 23 and the protrusion 24. The portion 83 is formed with a long hole (through hole) 84 into which the screw (male screw) 11 is inserted.
[0039]
The length L of the long hole 84 is larger than the diameter of the shaft portion of the screw 11. Thereby, the position and orientation of the substrate 8 can be adjusted (position adjustment), that is, the position and orientation of the photodiode 9 can be adjusted.
[0040]
In the present invention, instead of the long hole 84, for example, a circular hole (through hole) may be provided. In this case, it is preferable to set the diameter of the hole larger than the diameter of the shaft portion of the screw 11 and smaller than the diameter of the head of the screw 11. Thereby, the position and posture of the substrate 8 can be adjusted, that is, the position and posture of the photodiode 9 can be adjusted.
[0041]
In the present invention, it goes without saying that the hole into which the screw 11 is inserted is not limited to the long hole or the circular hole.
[0042]
On the other hand, a screw hole (female screw) 25 that engages with the screw (male screw) 11 is formed at the end of the bottom surface 21 opposite to the side 211 of the pickup base 2.
[0043]
The end portion 83 of the substrate 8 is fixed to the pickup base 2 by inserting the screw 11 into the elongated hole 84 and screwing into the screw hole 25.
[0044]
The photodiode 9 is connected to a predetermined circuit via a flexible relay substrate (not shown) connected to the substrate 8.
[0045]
Next, the operation of the optical pickup 1 will be described.
[0046]
First, a procedure for installing (attaching) the substrate 8 to the pickup base 2 will be described.
[0047]
As shown in FIGS. 2 and 3, the substrate 8 is gripped, the surface 81 at the end thereof is engaged with the engaging claws 22 and 23, and the surface 82 is brought into contact with the protrusion 24. Thereby, one end side of the substrate 8 is supported by the pickup base 2.
[0048]
Next, the long hole 84 of the substrate 8 is positioned at the position of the screw hole 25 of the pickup base 2, the screw 11 is inserted into the long hole 84 and screwed into the screw hole 25, and the substrate 8 is temporarily fixed to the pickup base 2. .
[0049]
As described above, since the length L of the long hole 84 is larger than the diameter of the shaft portion of the screw 11, the substrate 8 can be moved relative to the pickup base 2 in the temporarily fixed state.
[0050]
Further, as described above, when the long hole 84 is replaced with a circular hole (through hole), the diameter of the hole is larger than the diameter of the shaft portion of the screw 11 and smaller than the diameter of the head portion of the screw 11. However, the substrate 8 can be moved relative to the pickup base 2 in the temporarily fixed state.
[0051]
Next, by moving the substrate 8 relative to the pickup base 2 in a direction perpendicular to the optical axis of the objective lens 54, the position and orientation of the substrate 8 relative to the pickup base 2, that is, the position of the photodiode 9 relative to the pickup base 2 Adjust the posture (adjust XY axes). In this case, since the one end side of the board | substrate 8 is supported by the pick-up base 2, the said adjustment can be performed easily.
[0052]
Next, by adjusting the position of the head of the screw 11, the position of the objective lens 54 in the optical axis direction with respect to the pickup base 2 of the photodiode 9 is adjusted (optical path length adjustment is performed). Thus, the substrate 8 is mounted on the bottom surface 22 of the pickup base 2.
[0053]
This optical pickup 1 is mounted on an optical disk device.
[0054]
During recording (data writing) or reproduction (data reading), laser light is emitted from the laser diode of the optical pickup 1. This laser light is condensed by the objective lens 54 so as to have a predetermined beam diameter, and is applied to the rotating optical disk.
[0055]
The reflected light from the optical disk is collected by the objective lens 54, received by the photodiode 9, and photoelectrically converted. The signal from the photodiode 9 is input to a predetermined circuit and subjected to signal processing.
[0056]
As described above, according to the optical pickup 1, the substrate 8 can be easily attached to the pickup base 2 during assembly.
[0057]
Moreover, the XY axis adjustment and optical path length adjustment of the photodiode 9 can be easily performed.
[0058]
For this reason, the assembly operation of the optical pickup 1 can be easily performed. That is, it has good productivity and is advantageous for mass production.
[0059]
Moreover, in this optical pickup 1, since the board | substrate 8 is fixed by the engaging claws 22, 23 and the protrusion 24, and the single screw 11, for example, three screws, a photodiode holder, a photodiode spring, and a photo Compared to the case where the substrate 8 is fixed by using a diode cover or the like, the number of parts is small, which can reduce the cost and the structure is simple.
[0060]
Next, a second embodiment of the optical pickup of the present invention will be described.
[0061]
In addition, description is abbreviate | omitted about a common point with the optical pick-up 1 of 1st Embodiment mentioned above, and a main difference is demonstrated.
[0062]
FIG. 4 is a side view showing the engaging means and the substrate in the second embodiment of the optical pickup of the present invention.
[0063]
As shown in the figure, the engaging means of the optical pickup 1 is located between the first engaging claw 22 and the second engaging claw 23, and between the engaging claw 22 and the engaging claw 23. It consists of protrusions 26 and 27.
[0064]
The engagement claw 22 and the projection 26, the projection 26 and the projection 27, and the projection 27 and the engagement claw 23 are separated from each other by a predetermined distance. Further, the distance between the engaging claw 22 and the protrusion 26 and the distance between the engaging claw 23 and the protrusion 27 are equal.
[0065]
Further, the engaging claws 22 and 23 and the protrusions 26 and 27 are arranged in the same straight line.
[0066]
Further, the engaging claws 22 and 23 and the protrusions 26 and 27 are formed integrally with the pickup base 2.
[0067]
One end side of the substrate 8 is supported by the engaging claws 22 and 23 and the protrusions 26 and 27. That is, the engaging claws 22 and 23 are respectively engaged with the surface 81 opposite to the actuator base 3 (pickup base 2) of the substrate 8, and the protrusions 26 and 27 are respectively connected to the actuator base 3 (pickup) of the substrate 8. The one end side of the substrate 8 is supported by the pickup base 2 by contacting the surface 82 on the base 2) side.
[0068]
As in the first embodiment described above, the substrate 8 is screwed to the pickup base 2 on the other end side (a position spaced apart from the engagement location) with one end side supported by the pickup base 2. Has been.
[0069]
As described above, according to the optical pickup 1 of the second embodiment, the same effects as those of the optical pickup 1 of the first embodiment described above can be obtained.
[0070]
The optical pickup of the present invention has been described based on the illustrated embodiments. However, the present invention is not limited to these embodiments, and the configuration of each part is replaced with an arbitrary configuration having the same function. can do.
[0071]
For example, in the present invention, the substrate may be installed on the side of the pickup base.
[0072]
The present invention can also be applied to a case where a substrate provided with an optical element different from a photodiode is installed (attached) to a pickup base.
[0073]
【The invention's effect】
As described above, according to the optical pickup of the present invention, a substrate provided with an optical element (for example, a light receiving element such as a photodiode) can be easily attached to the pickup base, and the position of the optical element And posture can be adjusted easily. That is, the assembly operation of the optical pickup can be easily performed, and therefore, the productivity is good and it is advantageous for mass production.
[0074]
Further, according to the present invention, the number of parts is small, thereby reducing the cost and the structure is simple.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a first embodiment of an optical pickup according to the present invention.
FIG. 2 is a perspective view showing a first embodiment of the optical pickup of the present invention.
FIG. 3 is a side view showing engagement means and a substrate in the first embodiment of the optical pickup of the present invention.
FIG. 4 is a side view showing engagement means and a substrate in a second embodiment of the optical pickup of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Optical pick-up 2 Pickup base 21 Bottom surface 211 Side 22 1st engaging claw 23 2nd engaging claw 24, 26, 27 Protrusion 25 Screw hole 28, 29 Guide part 3 Actuator base 4 Damper base 5 Actuator 5a Fixing part 5b Movable part 51 Yoke 52 Permanent magnet 53 Lens holder 531 Lens support part 54 Objective lens 55 Tracking coil 56 Focusing coil 7 Suspension wire 8 Substrate 81, 82 Surface 83 End part 84 Long hole 9 Photodiode 11 Screw

Claims (7)

A substrate on which an optical element is provided, and a pickup base on which the substrate is installed,
The pickup base is provided with engagement means for engaging with a part of the substrate,
An optical pickup in which a portion of the substrate is engaged with the engagement means and the substrate is fixed to the pickup base at a position spaced a predetermined distance from the engagement location,
The engagement means is formed integrally with the pickup base, and a first engagement piece and a second engagement piece that engage with a surface of the substrate opposite to the pickup base;
And at least one protrusion formed integrally with the pickup base and positioned between the first engagement piece and the second engagement piece and contacting the surface of the substrate on the pickup base side. And
The first engagement piece and the second engagement piece respectively engage with a surface of the substrate opposite to the pickup base, and the protrusion contacts the surface of the substrate on the pickup base side. An optical pickup, wherein the substrate is fixed to the pickup base at the other end side in a state where the substrate is in contact with one end side of the substrate and thereby supported by the pickup base.   The optical pickup according to claim 1, wherein the optical element is a light receiving element that receives reflected light from an optical disk. An actuator provided with an objective lens for condensing the reflected light from the optical disc on the movable part;
An actuator base for supporting the actuator;
A pickup base that supports the actuator base and is reciprocally movable along a guide rod;
A substrate on which a light receiving element that receives light collected by the objective lens is mounted on a side opposite to the actuator base of the pickup base or on a side portion of the pickup base;
The pickup base is provided with engagement means for engaging with a part of the substrate,
An optical pickup in which a portion of the substrate is engaged with the engagement means and the substrate is fixed to the pickup base at a position spaced a predetermined distance from the engagement location,
The engagement means is formed integrally with the pickup base, and a first engagement piece and a second engagement piece that engage with a surface of the substrate opposite to the pickup base;
And at least one protrusion formed integrally with the pickup base and positioned between the first engagement piece and the second engagement piece and contacting the surface of the substrate on the pickup base side. And
The first engagement piece and the second engagement piece respectively engage with a surface of the substrate opposite to the pickup base, and the protrusion contacts the surface of the substrate on the pickup base side. An optical pickup, wherein the substrate is fixed to the pickup base at the other end side in a state where the substrate is in contact with one end side of the substrate and thereby supported by the pickup base.   4. The optical pickup according to claim 1, wherein a plurality of the protrusions are provided at a predetermined distance.   The optical pickup according to claim 1, wherein the substrate is disposed so as to be exposed to the outside of the pickup base. The substrate is installed on the bottom surface of the pickup base,
6. The optical pickup according to claim 1, wherein each of the first engagement piece and the second engagement piece is an engagement claw integrally formed on a bottom surface side of the pickup base. .   The optical pickup according to claim 1, wherein the substrate is fixed to the pickup base by screws.

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