JP2004005823A - Method for manufacturing optical head device and optical head device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical head device in which heat radiation to a frame from a laser emitting element can be performed smoothly and a light spot can be formed appropriately for a light receiving element, and to provide an optical head device. <P>SOLUTION: When an optical head device 1 is manufactured, since a first laser emitting element 4 is fixed to a frame through a metal attaching member, a heat radiation characteristic is enhanced. At the time, the tilt and the position of an outgoing light axis of the laser emitting element 4 are hard to be adjusted due to the restriction of a structure of the attaching member, but the position adjustment and tilt adjustment are performed by a rising mirror 15. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technique for adjusting a light intensity distribution in an optical head device having a laser light emitting element mounted on a frame.
[0002]
[Prior art]
2. Description of the Related Art In an optical head device used for recording and reproducing an optical recording medium such as a CD (compact disk) and a DVD (digital versatile disk), light emitted from a laser light emitting element such as a laser diode is transmitted to an objective lens via a light guide system. Then, the light converged by the objective lens is converged on the optical recording medium. Here, the objective lens, a lens driving device for driving the objective lens in the tracking direction and the focusing direction, and the like are mounted on a metal or resin frame, and the frame includes the laser light emitting element, A light receiving element such as a photodiode is also mounted. Here, conventionally, the laser light emitting element is fixed to the frame by press-fitting into a hole formed in the frame.
[0003]
However, in a structure in which the laser light emitting device is pressed into the hole of the frame, the optical axis of the laser light emitting device cannot be adjusted.
[0004]
Therefore, in recent years, a structure in which the laser light emitting element is floated from the frame and a thick adhesive is applied between the laser light emitting element and the laser light emitting element is fixed to the frame has been adopted. With such a structure, the laser light emitting element can be fixed at any position and posture.
[0005]
[Problems to be solved by the invention]
Here, in the case of an optical head device dedicated for reproduction, since heat generation of the laser light emitting element is small, there is no problem even if the laser light emitting element is mounted in a state of being floated from the frame. On the other hand, when recording is performed on an optical recording medium, the heat generated by the laser light emitting element during recording is large, and it is necessary to efficiently release the heat to the frame.
[0006]
However, when the laser light emitting element is adhered and fixed to the frame in a floating state, since the adhesive is thickly interposed between the laser light emitting element and the frame, the heat radiation efficiency is low, and the temperature of the laser light emitting element rises. Is significant.
[0007]
In view of the above problems, an object of the present invention is to provide an optical head capable of smoothly radiating heat from a laser light emitting element to a frame and capable of appropriately forming a light spot on a light receiving element. An object of the present invention is to provide a method of manufacturing a device and an optical head device manufactured by the method.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, a laser light emitting element, a reflecting mirror that reflects laser light emitted from the laser light emitting element and guides the laser light to an objective lens, and drives the objective lens in a focusing direction and a tracking direction Method for manufacturing an optical head device including an objective lens driving device, a light receiving element for receiving return light from an optical recording medium, and a frame on which the light receiving element, the laser light emitting element, the reflection mirror, and the objective lens are mounted In, before mounting the light receiving element on the frame, when mounting the laser light emitting element on the frame via a mounting member that comes into surface contact with the frame, or after mounting, the laser from the laser light emitting element Emit light, and adjust the position or inclination of the reflection mirror on the optical axis based on the monitoring result. And adjusting the light intensity distribution of the laser light beam guided to the objective lens by.
[0009]
In the present invention, since the laser light emitting element is mounted on the frame via the mounting member that comes into surface contact with the frame, no thick adhesive is interposed between the laser light emitting element and the frame. For this reason, even if the heat generated by the laser light emitting element during recording on the optical recording medium is large, this heat is efficiently transmitted to the frame via the mounting member, so that the temperature rise of the laser light emitting element can be suppressed. Further, when the laser light emitting element is mounted on the frame via the mounting member, it is difficult to adjust the inclination and the position of the emission optical axis of the laser light emitting element because of the structural restrictions of the mounting member. According to the present invention, since such position adjustment, tilt adjustment, and the like are performed by the reflection mirror, there is no problem even if a mounting structure giving priority to heat radiation is adopted for the laser light emitting element.
[0010]
In the present invention, when the laser light emitting element is mounted on the frame via the mounting member, it is preferable to adjust a position of the mounting member in an in-plane direction of the frame. Even in a structure in which a laser light source element is mounted on a frame using a mounting member from the viewpoint of giving priority to heat dissipation, if the mounting member is in surface contact with the frame, the mounting member in the in-plane direction of the frame is used. The position of can be adjusted.
[0011]
In the present invention, the mounting member includes a plate surface-bonded to the frame, and an element holder mounted on the frame via the plate while holding the laser light emitting element, and the element holder And the plate are in contact with each other via a sliding curved surface capable of switching a tilt of an emission optical axis of the laser light emitting element with respect to the frame, and the laser light emitting element is mounted on the frame via the mounting member. When adjusting the light intensity distribution of the laser beam guided to the objective lens by adjusting the inclination of the emission optical axis of the laser light emitting element by sliding the element holder with respect to the plate on the sliding curved surface Is preferred. With this configuration, the inclination of the emission optical axis of the laser light emitting element can be adjusted even in a structure in which the laser light source element is mounted on the frame using the mounting member from the viewpoint of giving priority to heat radiation.
[0012]
In the present invention, the return light of the laser light emitted from the laser light-emitting element is monitored by the light-receiving element, and the position of the light-receiving element is adjusted based on the monitoring result, whereby the laser light is formed on the light-receiving element. It is preferable to adjust the light intensity distribution of the light spot. When a structure in which a laser light source element is mounted on a frame using a mounting member from the viewpoint of giving priority to heat radiation is adopted, it is impossible to adjust the position of the laser light emitting element in the optical axis direction, and in a direction perpendicular to the optical axis. It is difficult to adjust the output optical axis in the above, but such adjustment may be performed by the light receiving element.
[0013]
In the present invention, a grating element for diffracting a laser beam and dividing it into a main beam composed of zero-order diffracted light and a sub-beam composed of ± first-order diffracted light may be arranged on the emission direction side of the laser light emitting element. In this case, before or after fixing the light receiving element to the frame, the return light of the laser light emitted from the laser light emitting element is monitored by the light receiving element. When the position of the sub beam is inclined with respect to the plane, the direction of the grating element may be adjusted. In addition, according to the monitoring result of the light receiving element, when the distance between the main beam and the sub beam is shifted with respect to the light receiving surface of the light receiving element, the position of the grating element on the optical axis may be adjusted.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an optical head device to which the present invention is applied will be described with reference to the drawings.
[0015]
(Overall configuration of optical head device)
FIG. 1 is a perspective view of an optical head device for recording and reproducing a CD, a CD-R, and a DVD. FIG. 2 is a plan view of the optical head device shown in FIG. FIG. 3 is a longitudinal sectional view of the optical head device shown in FIG. FIG. 4 is an explanatory diagram showing a planar layout of an optical system in the optical head device shown in FIG.
[0016]
As shown in FIGS. 1 and 2, the optical head device 1 of the present embodiment has a resin or metal frame 3, and the frame 3 is attached so as to be parallel to the device. Since the two guide shafts (not shown) are passed through the connecting portions 301, 302, and 303, they can move along the guide shafts.
[0017]
A first laser light emitting element 4 for DVD and a second laser light emitting element 5 for CD are mounted on the side surfaces 32 and 33 of the frame 3, respectively. The DVD laser light emitting element 4 is for recording and reproducing DVDs, and emits laser light having a wavelength of 650 nm or 635 nm. On the other hand, the laser light emitting element 5 for CD is for recording and reproducing of CD and CD-R, and emits laser light having a wavelength of 780 to 800 nm.
[0018]
A flexible substrate 8 is mounted on the frame 3, and a driving IC 10 is mounted on a main body 81 of the flexible substrate 8. A metal IC fixed to the frame 3 with screws 22 is provided above the driving IC 10. Radiator plate 21 made of aluminum. Therefore, the heat generated in the IC 10 escapes through the heat sink 21. Moreover, the IC 10 and the heat radiating plate 21 are arranged on the upper surface 31 of the frame 3, and the optical recording medium rotates at a position above this area. Therefore, since the heat radiating plate 21 efficiently dissipates heat by the flow of air generated by the rotation of the optical recording medium, the reliability of the optical head device 1 is high.
[0019]
As will be described later, optical elements such as a light receiving element, a sensor lens, a collimating lens, and a rising mirror (reflection mirror) are mounted on the frame 3, and an optical recording medium (see FIG. (Not shown), an objective lens 9 for emitting a laser beam is disposed. The frame 3 also has an objective lens driving device 50 that drives the objective lens 9 in the focusing direction and the tracking direction. In the present embodiment, a shaft sliding rotation type driving device is used as the objective lens driving device 50.
[0020]
3 and 4, the optical system of the optical head device 1 includes a first laser light emitting element 4 that emits a first laser beam L1 (long-wavelength laser light) for DVD and a second laser for CD. In addition to the second laser light emitting element 5 that emits the light L2, the first grating element 11, the first prism 12, the second prism 13, and the collimator along the emission optical axis of the first laser light emitting element 4. The lens 14 and the rising mirror 15 (reflection mirror) are arranged in this order, and the objective lens 9 is arranged above the rising mirror 15.
[0021]
The first grating element 11 is provided with a predetermined diffraction characteristic, and divides the first laser light L1 emitted from the first laser light emitting element 4 into three beams to form a well-known three-beam method or The tracking error can be detected by the DPP method.
[0022]
Therefore, the first laser light L1 emitted from the first laser light emitting element 4 is split into three beams by the first grating element 11, and then the partial reflection surface of the first prism 12 and the second laser light L1. After passing through the partially reflecting surface of the prism 13, it is converted into a parallel light beam by the collimating lens 14, then guided to the objective lens 9 by the rising mirror 15, and then converged on the optical recording medium D by the objective lens 9. .
[0023]
Here, the second prism 13 is an optical path synthesizing prism arranged such that the partial reflection surface is inclined by 45 degrees with respect to the optical axis of the laser beam L2 emitted from the first laser light emitting element 5. The relay lens 16, the second grating element 17, and the second laser light emitting element 5 are arranged in this order at the side positions of the second prism 12.
[0024]
The second grating element 17 is also provided with a predetermined diffraction characteristic, and divides the second laser beam L2 emitted from the CD laser light emitting element 5 into three beams to form a well-known three-beam method or DPP. The tracking error can be detected by the method.
[0025]
Therefore, the second laser light L2 emitted from the second laser light emitting element 5 is split into three beams by the second grating element 17, then passes through the relay lens 16, and then passes through the second prism. After being reflected by the partial reflection surface 13 and guided to the collimating lens 14 and converted into a parallel light beam by the collimating lens 14, the light is guided to the objective lens 9 by the rising mirror 15, and the objective lens is, similarly to the first laser light L 1. The light is converged on the optical recording medium by the lens 9.
[0026]
In the present embodiment, the first prism 12 is an optical path separating prism arranged such that the partial reflection surface is inclined by 45 degrees with respect to the optical axis of the return light Lr from the optical recording medium D. A sensor lens 18 and a light receiving element 2 are arranged at lateral positions of one prism 12. Therefore, the return light Lr from the optical recording medium D is guided to the first prism 12 by the objective lens 9, the rising mirror 15, the collimating lens 14, and the second prism 13, and the partial reflection surface of the first prism And reaches the light receiving element 2 via the sensor lens 18.
[0027]
The sensor lens 18 is a lens for generating astigmatism with respect to the return light of both laser lights L1 and L2, and the return light Lr of the laser light L1 and L2 detected by the light receiving element 9 is a sensor lens. Passing through 18 gives astigmatism. Therefore, as is well known, by forming four light receiving surfaces on the light receiving element 2, focusing correction can be performed based on the photoelectric flow rates of these light receiving surfaces.
[0028]
Although not shown, for example, a common monitoring light receiving element is disposed on the side opposite to the second laser light emitting element 5 with respect to the second prism 13.
[0029]
[Mounting structure to frame]
FIG. 5 is an explanatory diagram of a frame used in the optical head device shown in FIG. 1 as viewed obliquely from below. FIGS. 6A and 6B are a side view and a cross-sectional view, respectively, showing a state where the first laser light emitting element is mounted on the frame via a mounting member in the optical head device shown in FIG. FIGS. 7A and 7B are a side view and a cross-sectional view, respectively, showing a state in which a second laser light emitting element is mounted on a frame via a mounting member in the optical head device shown in FIG.
[0030]
As shown in FIG. 5, the frame 3 includes a side surface portion 32 on which the first laser light emitting element L1 is mounted, a side surface portion 33 on which the second laser light emitting device 5 is mounted, and a first A mounting section 34 for the prism 12, a mounting section 35 for the second prism 13, a mounting section 36 for the collimator lens 13, and a mounting section 37 for the rising mirror 15 are formed.
[0031]
In the optical head device 1 of the present embodiment, as shown in FIGS. 5 and 6A and 6B, as the mounting member 60 for mounting the first laser light emitting element 4 on the side surface 32 of the frame 3, A plate composed of a metal plate 61 having high heat dissipation and an element holder 62 also made of metal having high heat dissipation is used. The plate 61 is a plate-like member adhered to the side surface portion 32 of the frame 3, and the element holder 62 holds the first laser light emitting element 4 inside thereof. The element holder 62 has a curved surface 621 on both sides of the front surface, while a concave portion 611 for receiving the curved surface 621 of the element holder 62 is formed on the plate 61 side. The inner surface of the concave portion 611 can be rotated as a sliding surface 601.
[0032]
The plate 61 is formed in a size that allows adjustment of the position in the in-plane direction (direction indicated by arrows X1 and Y1) along the side surface portion 32 of the frame 3. Therefore, the position of the first laser light emitting element 4 can be adjusted in the directions indicated by arrows X1 and Y1 along the in-plane direction of the side surface portion 32 of the frame 3 and the element holder 62 slides on the sliding surface 601. By doing so, it is possible to rotate in the horizontal direction as shown by the arrow R1.
[0033]
In FIG. 5 again, the inside of the mounting portion of the second laser light emitting element 5 is a large groove 38 having a semicircular cross section which can be mounted in a state where the second grating element 17 is mounted on the cylindrical holder 170. On both sides of the groove 38, support portions 39 for both end portions of the lens holder 160 holding the relay lens 16 are formed as flat surfaces. Therefore, the position of the second grating element 17 can be adjusted in the optical axis direction as shown by the arrow Z2, and can be rotated around the optical axis as shown by the arrow R6. The position of the sensor lens 17 can be adjusted in the optical axis direction as indicated by an arrow Z4.
[0034]
The first grating element 11 is also held in a cylindrical holder 110, for example, like the second grating element 17, and can be adjusted in the optical axis direction as indicated by an arrow Z1, and can be adjusted by an arrow. As shown by R7, it is rotatable around the optical axis.
[0035]
Here, as shown in FIGS. 5 and 7A and 7B, the second laser light emitting element 5 is connected to the frame 3 in the same manner as the first laser light emitting element 4. A member including a plate 71 and an element holder 72 is used as a mounting member 70 to be mounted on the side surface portion 33 of FIG. The plate 71 is a plate-like member adhered to the side surface portion 33 of the frame 3, and the element holder 72 holds the second laser light emitting element 5 inside thereof. The element holder 72 has a curved surface 721 on both sides of the front surface, while a concave portion 711 for receiving the curved surface 721 of the element holder 72 is formed on the plate 71 side. The inner surface of the concave portion 711 can be rotated as a sliding surface 701.
[0036]
Further, the plate 71 has a size capable of adjusting the position in the in-plane direction (direction indicated by arrows X2 and Y2) along the side surface portion 33 of the frame 3. Therefore, the second laser light emitting element 5 can move in the directions indicated by arrows X2 and Y2 along the in-plane direction of the side surface portion 33 of the frame 3 and slide the element holder 72 on the sliding surface 701. This allows horizontal rotation as indicated by arrow R2.
[0037]
As described above, in this embodiment, since the two laser light sources 4 and 5 are fixed to the frame 3 by the mounting members 60 and 70 having the same structure, the influence of the environmental temperature is equal, and therefore, measures against the temperature change are easy. is there.
[0038]
As shown by an arrow Z3 in FIG. 4, the position of the sensor lens 18 can also be adjusted in the optical axis direction.
[0039]
[Method of Manufacturing Optical Head Device]
FIGS. 8A to 8D are diagrams illustrating the intensity distribution of the laser beam guided to the objective lens in the optical head device shown in FIG. FIG. 9 is an explanatory diagram showing a state where the main beam and the sub beam form spots on the light receiving element in the optical head device shown in FIG.
[0040]
In manufacturing the optical head device 1 of the present embodiment, the first laser light emitting element 4 first emits light, and while monitoring the light through the objective lens 9, the plate 61 is removed. The position is adjusted in two axial directions (X1 direction and Y1 direction) along the side surface 32 of the frame 3 together with the element holder 62.
[0041]
That is, the mounting member 60 of the present embodiment has a configuration in which the mounting member 60 comes into surface contact with the frame 3 in consideration of heat dissipation, so that the position can be adjusted in the in-plane direction of the frame 3.
[0042]
At this time, in the objective lens 9, if the center 90 of the objective lens 9 and the center L0 of the light beam coincide as shown in FIG. 8A, the light is emitted as shown in FIGS. 8B and 8C. A spot having a suitable light intensity distribution can be formed on the track of the recording medium D, and a spot having a suitable light intensity distribution can be formed on the light receiving element 2.
[0043]
Accordingly, based on the monitoring result, as shown in FIG. 8D, when the center L0 of the light beam is shifted from the center 90 (center of the designed light beam) of the objective lens 9 by the distance β, the optical axis is shifted. First, the position or inclination of the rising mirror 15 on the optical axis is adjusted to align the center L0 of the light beam with the center 90 of the objective lens 9.
[0044]
As described above, in the present embodiment, since the first laser light emitting element 4 is mounted on the frame 3 via the mounting member 60, the emission optical axis of the first laser light emitting element 4 is subject to the restriction of the configuration of the mounting member 60. Although it is difficult to adjust the inclination and position of the first laser light emitting element 4, since such position adjustment and inclination adjustment are performed by the rising mirror 15, the mounting structure using the mounting member 60 There is no problem even if heat dissipation is prioritized by adopting.
[0045]
Further, as shown in FIG. 8D, the case where the emission optical axis of the first laser light emitting element 4 is inclined by an angle α in the horizontal direction and the center L0 of the light beam is shifted from the center 90 of the objective lens 9. In order to adjust the inclination of the emission optical axis of the first laser light emitting element 4 by sliding and rotating the element holder 62 with respect to the plate 61 as shown by an arrow R1, The center L0 of the light beam is adjusted.
[0046]
As described above, in the mounting member 60 used in the present embodiment, since the element holder 61 and the plate 62 are in contact with each other via the sliding curved surface 601, the mounting structure using the mounting member 60 is given priority to heat dissipation. Also, the inclination of the emission optical axis of the first laser light emitting element 4 can be adjusted.
[0047]
After such adjustment, the plate 61 is bonded and fixed to the side surface portion 32 of the frame 3 and the element holder 62 is bonded and fixed to the plate 61.
[0048]
After the first laser light emitting element 4 is fixed to the frame 3 in this way, the first laser light emitting element 4 is caused to emit light, the return light is monitored by the light receiving element 2, and the light receiving element is determined based on the monitoring result. 2 is bonded and fixed to the frame 3 at an optimum position.
[0049]
Here, in the light receiving element 2, as shown in FIG. 9, a four-divided light receiving surface 201 on which a spot of a main beam L11 composed of zero-order diffracted light is formed, and a spot of a sub-beam L12 composed of ± first-order diffracted light are formed. Two two-divided light receiving surfaces 202 are formed. Therefore, when the position of the sub beam L12 is inclined by the angle γ with respect to the light receiving surfaces 201 and 202 in the monitoring result of the light receiving element 2, the direction of the grating element 11 is adjusted.
[0050]
When the distances G1 and G between the main beam L11 and the sub-beam L12 deviate from the light receiving surfaces 201 and 602, the position of the grating element 11 on the optical axis is adjusted. Such adjustment may be performed at any timing before or after the light receiving element 2 is bonded and fixed to the frame 3.
[0051]
Next, as with the first laser light emitting element 4, the second laser light emitting element 5 emits light, and the second laser light emitting element 5 is monitored via the objective lens 9. At this time, although the position of the rising mirror 15 has already been adjusted, the emission optical axis of the second laser light emitting element 5 is inclined by an angle α in the horizontal direction, and the light flux from the center 90 of the objective lens 9 is The center L0 may be shifted. In this case, by sliding and rotating the element holder 72 with respect to the plate 71 as shown by an arrow R2 to adjust the inclination of the emission optical axis of the second laser light emitting element 5, the center of the objective lens 9 is adjusted. The center L0 of the light beam is adjusted to 90.
[0052]
The return light of the second laser light L2 emitted from the second laser light emitting element 5 is monitored by the light receiving element 2, and the result of the monitoring indicates that the optical axis of the second laser light emitting element 5 is in a direction orthogonal to it. If it is shifted to the position, the position of the plate 71 is adjusted in the two axial directions (the X2 direction and the Y2 direction) along the side surface portion 33 of the frame 3 together with the element holder 72.
[0053]
That is, the attachment member 70 is also configured such that the attachment member 70 comes into surface contact with the frame 3 in consideration of heat dissipation, but the position of the attachment member 70 can be adjusted in the in-plane direction of the frame 3.
[0054]
After such adjustment, the plate 71 is bonded and fixed to the side surface portion 33 of the frame 3 and the element holder 72 is bonded and fixed to the plate 71.
[0055]
After or before fixing the second laser light emitting element 5 to the frame 3 in this way, the return light of the second laser light L2 emitted from the second laser light emitting element 5 is monitored by the light receiving element 2. I do. As a result of the monitoring, when the position on the optical axis of the second laser light emitting element 5 is shifted and out of focus, the second laser light emitting element 5 is fixed to the side surface 33 of the frame 3 by the mounting member 70. Therefore, the position of the second laser light emitting element 5 on the optical axis cannot be adjusted. However, in this embodiment, the relay lens 16 is moved on the optical axis as shown by the arrow Z2, or the sensor lens 18 is moved by the arrow Z3. Then, the laser light is moved on the optical axis, and the second laser light emitting element 5 and the light receiving element 2 are focused.
[0056]
Also at this time, as shown in FIG. 9, the direction of the grating element 11 is adjusted when the position of the sub-beam L12 is inclined by an angle γ from the optimum position with respect to the light receiving surfaces 201 and 202, as shown in FIG. On the other hand, when the gaps G1 and G between the main beam L11 and the sub beam L12 deviate from the light receiving surfaces 201 and 202, the position of the grating element 11 on the optical axis is adjusted. Such adjustment may be performed at any timing before or after the second laser light emitting element 5 is fixed to the frame 3.
[0057]
【The invention's effect】
As described above, in the present invention, since the laser light emitting element is mounted on the frame via the mounting member that comes into surface contact with the frame, no thick adhesive is interposed between the laser light emitting element and the frame. For this reason, even if the heat generated by the laser light emitting element during recording on the optical recording medium is large, this heat is efficiently transmitted to the frame via the mounting member, so that the temperature rise of the laser light emitting element can be suppressed. In addition, when the laser light emitting element is mounted on the frame via the mounting member, it is difficult to adjust the inclination and the position of the emission optical axis of the laser light emitting element because the configuration of the mounting member is restricted. In the present invention, since such position adjustment, tilt adjustment, and the like are performed by the reflection mirror, there is no problem in using a mounting structure using a mounting member for the laser light emitting element with priority given to heat radiation.
[Brief description of the drawings]
FIG. 1 is a perspective view of an optical head device that performs recording and reproduction of a CD, a CD-R, and a DVD.
FIG. 2 is a plan view of the optical head device shown in FIG.
FIG. 3 is a longitudinal sectional view of the optical head device shown in FIG.
FIG. 4 is an explanatory diagram showing a planar layout of an optical system in the optical head device shown in FIG. 1;
5 is an explanatory diagram of a frame used for the optical head device shown in FIG. 1 as viewed obliquely from below.
FIGS. 6A and 6B are a side view and a cross-sectional view, respectively, showing a state in which a first laser light emitting element is mounted on a frame via a mounting member in the optical head device shown in FIG. is there.
7A and 7B are a side view and a cross-sectional view, respectively, showing a state in which a second laser light emitting element is mounted on a frame via a mounting member in the optical head device shown in FIG. is there.
FIGS. 8A to 8D are diagrams illustrating the intensity distribution of a laser beam guided to an objective lens in the optical head device shown in FIG. 1;
FIG. 9 is an explanatory diagram showing a state where a main beam and a sub beam form a spot on a light receiving element in the optical head device shown in FIG. 1;
[Explanation of symbols]
1 Optical head device
2 Light receiving element
3 frames
4. First laser light emitting device for DVD
5. Second laser light emitting device for CD
8 Flexible board
9 Objective lens
10 Driving IC
11 First grating element
12 First prism
13 Second prism
14 Collimating lens
15 Start-up mirror (reflection mirror)
16 relay lens
17 Second grating element
32, 33 Side of frame
50 Objective lens drive
60, 70 Mounting member for laser light emitting element
61, 71 plates
62, 72 element holder
201, 202 split light receiving surface
601, 701 sliding surface
621, 721 Curved surface of element holder
611, 711 Plate recess
D Optical recording medium
First laser beam for L1 DVD
Second laser beam for L2 CD
Lr return light
18 Sensor lens

Claims (7)

A laser light emitting element, a reflecting mirror that reflects laser light emitted from the laser light emitting element and guides the laser light to an objective lens, an objective lens driving device that drives the objective lens in a focusing direction and a tracking direction, and an optical recording medium. In a method for manufacturing an optical head device having a light receiving element for receiving return light, and a frame on which the light receiving element, the laser light emitting element, the reflection mirror, and the objective lens are mounted,
When or after mounting the laser light-emitting element on the frame via a mounting member that makes surface contact with the frame, the laser light-emitting element emits laser light from the laser light-emitting element. A method for manufacturing an optical head device, comprising: adjusting a position or an inclination of a mirror on an optical axis to adjust a light intensity distribution of a laser beam guided to the objective lens. 2. The optical head device according to claim 1, wherein the position of the mounting member in an in-plane direction of the frame is adjusted when the laser light emitting element is mounted on the frame via the mounting member. Method. 3. The mounting member according to claim 1, wherein the mounting member includes a plate that is surface-bonded to the frame, and an element holder that is mounted on the frame via the plate while holding the laser light emitting element,
The element holder and the plate are in contact with each other via a sliding curved surface capable of switching a tilt of an emission optical axis of the laser light emitting element with respect to the frame,
When mounting the laser light emitting device on the frame via the mounting member, the device holder is slid with respect to the plate on the sliding curved surface to adjust the inclination of the emission optical axis of the laser light emitting device. Thereby adjusting the light intensity distribution of the laser beam guided to the objective lens. In any one of claims 1 to 3, before mounting the light receiving element on the frame, the return light of the laser light emitted from the laser light emitting element is monitored by the light receiving element, based on the monitoring result, A method for manufacturing an optical head device, comprising: adjusting a position of the light receiving element to adjust a light intensity distribution of a light spot formed on the light receiving element. 5. The grating device according to claim 1, further comprising, on the emission direction side of the laser light emitting element, a grating element for diffracting the laser light and dividing the laser light into a main beam composed of 0-order diffracted light and a sub-beam composed of ± 1st-order diffracted light. ,
Before fixing the light receiving element to the frame or after fixing, the return light of the laser light emitted from the laser light emitting element is monitored by the light receiving element. Wherein the direction of the grating element is adjusted when the position of the sub-beam is tilted. 5. The grating device according to claim 1, further comprising, on the emission direction side of the laser light emitting element, a grating element for diffracting the laser light and dividing the laser light into a main beam composed of 0-order diffracted light and a sub-beam composed of ± 1st-order diffracted light. ,
Before fixing the light receiving element to the frame or after fixing, the return light of the laser light emitted from the laser light emitting element is monitored by the light receiving element. Wherein the position of the grating element on the optical axis is adjusted when the distance between the main beam and the sub beam is shifted. An optical head device manufactured by the manufacturing method defined in any one of claims 1 to 6.

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