JP2001283456A - Attaching structure for light emitting member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide attaching structure for a light emitting member capable of easily performing positional adjustment for the housing of the light emitting member. SOLUTION: A two-wavelength laser diode 102 is integrally composed with a package having a cylindrical stem 102a and external connecting terminals 102g, and an attaching part consisting of a storing chamber 106a which stores a cap part 102e of the two-wavelength laser diode 102 and an attaching hole 106b into which the stem 102a is force-fitted is formed in the housing 106. The two-wavelength laser diode 102 is attached to the housing 106 in the state of being positioned in the direction orthogonal to an axial center and also a V shaped groove 106m by which one end part 111a' of an adjusting jig is supported as a turning fulcrum is provided in the attaching hole 106b, and a recessed groove 102h by which the other end 111a" is locked is provided in the stem 102a. The inner wall of the recessed groove 102h is pressed with the other end part 111a" by the turning operation of the adjusting jig, and the rotational position of the two-wavelength laser diode 102 is adjusted by turning the stem 102a around the axial center.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a light-emitting member which can easily adjust the position of the light-emitting member with respect to a housing.

[0002]

2. Description of the Related Art As a conventional technique, a case will be described in which a light emitting member is mounted and fixed after adjusting a position of a light emitting member in a housing provided in an optical pickup device.

An optical pickup device is attached to an optical disk device, makes a laser beam incident on the optical disk,
The information is recorded on the disk surface, and the recorded information is reproduced.

FIG. 17 is a partial perspective view of a conventional optical pickup device 50.

[0005] A conventional optical pickup device 50 comprises a housing or carriage 51 which is attached to an optical disk device and reciprocates, a light emitting member 18 attached to the carriage 51, a light receiving member 19, and a beam splitter 2.
0, a lens, that is, a collimator lens 21, a reflection mirror 22, and a condenser lens 23.

The light emitting member 18 is a metal cylindrical main body 1.
8a and a flanged stem 18 integral with the body 18a
b, and a light emitting element such as a laser diode is housed in the package.
An emission port (not shown) for emitting laser light emitted from the light emitting element is formed on the front surface of the main body 18a on the side opposite to the stem 18b, and is transparent so as to close the emission port. A glass plate is fixed to seal the inside of the main body 18a. On the other hand, a plurality of external terminals 18c protrude from the surface of the stem 18b opposite to the main body 18a.

The light receiving member 19 comprises a rectangular plate-shaped main body 19a and a plurality of external terminals 19b protruding from both sides of the main body 19a, and a light receiving element such as a photodiode is housed in the main body 19a. Also, the main body 19
An entrance (not shown) through which a laser beam is incident is formed on the front surface (the rear side in FIG. 17) of the main body 19a. Further, a transparent glass plate is fixed so as to cover the entrance and the inside of the main body 19a is formed. It is sealed.

[0008] The beam splitter 20 includes a light emitting member 18.
Transmitting the laser light emitted from the light source and returning the light to the light receiving member 1
9 is an optical element having a function of reflecting light.

The collimator lens 21 is a lens for converting the laser light transmitted through the beam splitter 20 into parallel light.

The reflection mirror 22 has a prism shape, and a reflection film is formed on the slope of the reflection mirror 22 to form a reflection surface. The laser light transmitted through the collimator lens 21 on this reflection surface is reflected by the reflection mirror 22. It is an optical element that deflects by approximately 90 degrees toward an objective lens (not shown) attached to the carriage 51 so as to be disposed thereon.

The condenser lens 23 includes a beam splitter 2
This is a lens for converting the return light reflected at 0 into an optimum spot for the light receiving element of the light receiving member 19.

The carriage 51 is formed by die-casting into a relatively thick, substantially box-shaped metal material such as aluminum. At the center of the carriage 51, a rectangular concave portion 52 and a narrow and narrow groove-shaped concave portion 53 are formed so as to be connected to the concave portion 52. A projection 54 is formed on one side wall surface of the carriage 51 along the length direction of the recess 53.

Further, a hole (not shown in the figure) penetrating toward the recess 53 is formed at the center of the mounting surface 54a, which is the tip surface of the projection 54. Similarly, a hole (not shown in the figure) penetrating toward the recess 53 is formed in the center of the mounting surface 51a, which is the side wall surface on the near side of the carriage 51 in FIG.
The diameter of the hole formed in the mounting surface 51a is the same as that of the light emitting member 1.
8 is formed larger than the diameter of the main body 18b.

The light receiving member 19 is mounted on the carriage 51.
When the main body 1 is installed, the entrance of the light emitting member 18 is aligned with the hole formed in the mounting surface 54a of the projection 54.
9a and align the front surface of the main body 19a with the mounting surface 54a.
, And is fixed with an adhesive or the like.

The condensing lens 23 is disposed at a predetermined position in an optical path between a hole penetrating from the center of the mounting surface 54a of the projection 54 toward the recess 53, and is fixed with an adhesive or the like. It has become so. The reflection mirror 22 is positioned and mounted on the inner bottom surface of the concave portion 52, and is fixed with an adhesive or the like.

The collimator lens 21 has a concave 53
The collimator lens 21 is arranged so that the outer diameter of the collimator lens 21 fits between the opposing surfaces of the wall portions 56, 56 provided on the carriage 51.
After positioning with respect to the wall portion 56,
An appropriate amount is applied and fixed near 56.

The beam splitter 20 has a concave portion 53.
In a state where the lower surface of the beam splitter 20 is held in contact with a reference surface (not shown) formed on the inner bottom surface at a predetermined position, an appropriate amount of adhesive is applied to a predetermined position and fixed.

When the light emitting member 18 is incorporated,
First, for example, an outer peripheral portion of the stem 18b is sandwiched by an adjustment jig (not shown), and the cylindrical main body 18a of the light emitting member 18 is fitted into a hole formed in the mounting surface 51a of the carriage 51. Then, with the front surface of the stem 18b pressed against the mounting surface 51a, the light emitting member 18 is provided on the adjustment jig so that the laser light emitted from the light emitting member 18 travels along a predetermined optical path of the optical system of the optical pickup device 50. The position is adjusted by the fine adjustment mechanism in the x and y coordinate directions in the drawing and in the θ direction which is the rotation direction around the axis of the stem 18b, and then fixed to the mounting surface 51a of the carriage 51 with an adhesive or the like. .

In the optical pickup device 50 configured as described above, the laser beam emitted from the emission port of the light emitting member 18 is transmitted to the beam splitter 20 and the collimator lens 2.
1, further passes through a reflection mirror 22, and is bent at a right angle from a horizontal direction to a vertical direction as shown by an arrow in FIG. 17 to be incident on an objective lens (not shown) and condensed on an optical disk surface (not shown). Irradiated laser light. The return light reflected on the optical disk surface returns to the beam splitter 20 along the reverse path, and is reflected by the beam splitter 20, and the reflected laser light is reflected by the light receiving member 1.
By receiving the light at 9, the reproduction of the optical disk or the like is performed.

[0020]

As described above, conventionally, when the light emitting member is mounted and fixed to the carriage 51 (housing), not only the adjustment range of the light emitting member 18 but also the adjustment range is minute. Since the adjustment in the θ direction must be performed at the same time while performing the positioning in the x, y coordinate directions, the adjustment work is very difficult and troublesome.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a mounting structure of a light emitting member capable of easily adjusting the position of the light emitting member with respect to a housing.

[0022]

According to a first aspect of the present invention, there is provided a mounting structure for mounting a light emitting member on a housing, wherein the light emitting member includes a light source and a package including the light source. The package is integrally formed with an external connection terminal provided on the package, the package includes a cylindrical stem, and a housing portion is formed in the housing so as to fit the light emitting member in an axial direction of the stem. The stem is press-fitted into the housing portion, and the light-emitting member is attached to the housing in a state where the light-emitting member is positioned in a direction perpendicular to the axis, and the housing is supported by one end of an adjustment jig. A supporting portion capable of displacing the other end portion as a support, and a locking portion capable of locking the other end portion of the adjusting jig is provided on the stem. By operating the adjusting jig, the other end portion presses the locking portion, and rotates the stem around the axis against a pressure input acting on the stem, thereby rotating the stem of the light emitting member. It is characterized in that the rotational position adjustment around the center can be performed.

Further, as a second solution, the locking portion is a concave groove formed on the outer peripheral surface of the stem in the axial direction of the stem, and the support portion is opposed to the concave groove to accommodate the housing. V-shaped groove formed by cutting out the inner wall surface of the portion.
The opening of the U-shaped groove is wider than the opening of the concave groove, and the adjusting jig includes the operating piece having the one end and the other end at both ends. The operating piece can be inserted so that the one end and the other end are respectively disposed in the V-shaped groove and the concave groove, and the one end is formed into the V-shaped groove by the twisting operation of the adjusting jig. It is supported by a character bottom, and the other end can press the inner wall of the concave groove.

Further, as a third solution, a composite optical unit is constituted by integrally attaching and fixing the light emitting member and the light receiving member to the housing accommodating the composite optical member,
The light emitting member has the two light sources arranged side by side, and light beams having different wavelengths emitted from the two light sources are emitted from the light emitting member at predetermined intervals in the axial direction of the stem, and the composite optical member Has an optical axis in the axial direction of the stem, and has an input surface and an output surface for the two lights on both end surfaces in the optical axis direction, respectively. An emission port is formed, and the light emitting member emits light from the light emitting member.
Two lights are incident on the entrance surface and exit from the exit surface,
The two emitted lights are radiated to the outside of the housing through the entrance and exit ports, and both return lights from the outside are incident on the emission surface and are deflected in the direction of the light receiving member in the process of transmitting through the composite optical member. Emitted from the composite optical member, the two return lights are received by the light receiving member, and the adjusting jig is operated by the adjusting jig so that the two return lights are received at a predetermined position of the light receiving member. The present invention is characterized in that the rotational position around the axis can be adjusted.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A mounting structure of a composite optical member according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is an explanatory view showing an optical pickup device 100 according to an embodiment of the present invention, FIG. 2 is a partially sectional perspective view of a two-wavelength laser diode 102, and FIG. 4 is a left side view of FIG. 3, FIG. 5 is a right side view of FIG. 3, FIG. 6 is a view from the direction 6 of FIG. 3, FIG. 7 is a plan view of the housing 106, and FIG. 9 is a left side view of FIG. 8, FIG. 10 is a right side view of FIG. 8, FIG.
FIG. 12 is a view from the direction 11 in FIG. 8, and FIG.
2-12 is a partial cross-sectional view, FIG. 13 is an explanatory view for explaining the function of the composite optical member 105, FIG. 14 is an explanatory view showing a mounting state of the stem 102a in the mounting hole 106b, and FIG.
FIG. 16 is an explanatory view for explaining how the rotational position of the light emitting member 102 is adjusted, and FIG. 16 is a perspective view of the adjusting jig 110.

[0027] As shown in FIG.
00 is a pickup body, that is, a carriage 500
And a composite optical unit 101, a flat reflecting mirror 300, a collimating lens 400, and an objective lens 200 disposed in the carriage 500. The composite optical unit 101 includes the composite optical member 105 according to the embodiment of the present invention.

The optical pickup device 100 is disposed so as to face an optical disk, that is, a CD 61 or a DVD (digital versatile disk or digital video disk) 62, and is provided with a CD 61 (DV).
D62) Focusing (F) in a direction orthogonal to the plane
The objective lens 200 is movably supported in the tracking direction (T), which is the radial direction of the CD 61 (DVD 62). The objective lens 200 is a CD61 and a DVD.
62.

The composite optical unit 101 is an integrated optical element that receives and emits light, and irradiates a laser beam onto the optical disk and receives reflected light (return light) from the optical disk to reproduce information recorded on the optical disk. Or to record information on an optical disc.

As shown in FIG. 1, the composite optical unit 101 mainly includes a light emitting member, that is, a two-wavelength laser diode 102, and a light receiving member 1 having a light receiving element 104a built therein.
04, the composite optical member 105, and the printed circuit board 107
And a housing 106 to which these members are attached and fixed.

As shown in FIG. 2, the two-wavelength laser diode 102 includes a cylindrical stem 102a and a stem 102a.
a, a rectangular parallelepiped base 102b protruding from one flat portion 102a ', a laser chip 103 positioned and fixed on the side wall surface of the base 102b, and a flat portion 102a' including the base 102b. A cylindrical body 1 that is attached and fixed
The cap 102e includes a top plate 102d having an opening 102d and an opening 102d ', and a transparent disk-shaped glass plate 102f fixed so as to cover the opening 102d' from the inside of the cap 102e. ing. In this manner, the laser chip 103 is arranged in a sealed space in one package including the stem 102a, the cap portion 102e, and the glass plate 102f.

The laser chip 103 has a light source 103a for emitting a short-wavelength (wavelength 650 nm band) laser beam 103a 'for DVD, and a long-wavelength (wavelength 780) for CD.
light source 103b that emits laser light 103b '
Are formed close to each other so as to have an interval D. In the present embodiment, D is set to 120 μm. In the 650 nm band for DVD, specifically, 635 nm or 650 nm is adopted as the DVD standard.

The laser beams 103a 'and 103b' emitted from the light sources 103a and 103b are emitted through the opening 102d 'so as to be parallel to each other in a direction orthogonal to the one flat portion 102a' of the stem 102a. It has become so. Note that the laser beams 103a ', 1
The emission position of 03b 'is located at the tip surface 10 of the laser chip 103.
3 '(arranged so as to be parallel to the plane portion 102a'). The optical axis of the laser beam 103a 'is disposed so as to coincide with the axis of the stem 102a.

On the other hand, on the outer peripheral surface of the stem 102a, a locking portion, that is, a concave groove 1 notched in the axial direction of the stem 102a.
02h is formed with a groove. A plurality of external connection terminals 102g (see FIG. 1) protrude from the other flat portion of the stem 102a opposite to the one flat portion 102a ', and the laser chip is connected via the external connection terminals 102g. 1
For example, a drive current is supplied to the drive circuit 03.

In the process of manufacturing the two-wavelength laser diode 102, the laser chip 103 having the two light sources 103a and 103b is processed on a predetermined substrate surface by a process similar to a semiconductor process.
The distance D between a and 103b can be easily and uniformly formed to a predetermined value with high accuracy. In addition, since mass production of discrete components is possible, the cost of the two-wavelength laser diode 102 can be reduced.

As shown in FIG. 1, the light receiving member 104 includes a package 104b having a light receiving window 104b 'and incorporating a light receiving element 104a, and external connection terminals 104c protruding from both sides of the package 104b. I have.
A power supply voltage for the light receiving element 104a can be supplied through the external connection terminal 104c, and a signal photoelectrically converted by the light receiving element 104a can be output to the outside.

The composite optical member 105 shown in FIGS.
An incident surface 105a and an outgoing surface (return light incident surface) formed by integral molding of a resin having high transmittance and arranged in parallel.
A trapezoidal protruding portion 105 having a truncated cone-shaped base portion 105c having both end surfaces 105b in the direction of the optical axis N and an inclined surface portion 105d 'formed so as to protrude from the incident surface 105a.
d.

The base portion 105c is formed such that its diameter decreases as it goes in the direction (forward) of the light exit surface 105b. Further, a columnar portion 105j having a first restricting portion, that is, a cylindrical surface 105j '(restricting surface) is formed at a front end portion of the base portion 105c. The emission surface 105b is a front end surface of the columnar portion 105j.

The columnar portion 105j of the base portion 105c
On the outer peripheral surface of the rear end portion 105k on the opposite side, four protruding portions 105k 'are formed substantially evenly in the circumferential direction. Note that the second regulating portion, that is, the tip surface (regulating surface) of each protrusion 105k 'is a columnar surface. In FIG. 3, a columnar position regulating protrusion 105m is integrally formed on the lower surface of the central portion of the base portion 105c so as to protrude downward.

As shown in FIGS. 3, 4 and 12,
On the incident surface of the base portion 105c and the rear end surface of the protruding portion 105d, between each protruding portion 105k ', the second diffraction grating 105g and the three-beam diffraction grating 105h, a buffer region, that is, a space portion 105s is formed. A counterbore is formed at a predetermined depth in the direction of the axis N.

A first diffraction means, that is, a rectangular first diffraction grating 105f is formed at the center of the emission surface 105b. The surface of the inclined surface 105d 'is coated with an optical film (not shown), so that the inner wall surface of the inclined surface 105d' has a return light reflecting surface 105d ".
Are formed. The return light reflecting surface 105d "is provided with a second diffraction means, that is, a reflection type second diffraction grating 105.
g, a three-beam diffraction grating 105h that generates three beams for CD tracking control is formed on the incident surface 105a.

Further, the return light reflecting surface 1 of the protrusion 105d
On the side wall surface opposite to 05d ″, a flat surface 105n is formed so as to extend over the base portion 105c.
05n, the cylinder surface 105i for the astigmatism method, which is a focus control method, is shifted from the optical axis N by a predetermined angle α.
A groove is formed in an oblique direction (see FIG. 6), and the inner wall of the cylinder surface 105i is a return light emission surface 105p. In the present embodiment, the composite optical member 105 is formed by integral molding using a molding die together with the first and second diffraction gratings 105f and 105g, the three-beam diffraction grating 105h, and the cylinder surface 105i.

In this embodiment, the exit surface 105b and the return light incident surface are the same, but the exit surface and the return light incident surface are separately provided, and the first diffraction grating is formed on the return light incident surface. You may do so. The details of the first and second diffraction gratings 105f and 105g and the three-beam diffraction grating 105h in the composite optical member 105 will be described later.

The housing 106 shown in FIGS.
It is made of an aluminum die-cast block and mainly includes a cylindrical body 106g and mounting portions 106h and 106i projecting outward from both ends of the cylindrical body 106g. These mounting portions 106h and 106i have rectangular mounting surfaces 106h 'and 106i', respectively.

On the left end side (rear end side) of the cylindrical body portion 106g in FIG. 8, an accommodating portion including an accommodating chamber 106a and a mounting hole 106b is formed. The accommodation room 106a is provided with the cap 102e of the two-wavelength laser diode 102 shown in FIG.
Is a space into which is inserted. Also, the mounting hole 106b
A counterbore is formed on the left end surface of the cylindrical body 106g, and is used for positioning and attaching and fixing the two-wavelength laser diode 102. The diameter of the mounting hole 106b is 2
The wavelength laser diode 102 is set to a predetermined size that is smaller than the diameter of the stem 102a (see FIG. 2).

Further, as shown in FIG. 9, a support portion, ie, a V-shaped groove 106m is formed on the inner wall surface of the mounting hole 106b with a position regulating groove 106d (described later) at an angle of 90 degrees around the central axis N '. It is formed in the direction of the central axis N '. The opening of the V-shaped groove 106m is, as shown in FIG.
The width is set to be wider than the opening of the concave groove 102h formed in the stem 102a of the wavelength laser diode 102.

A housing chamber 106c is formed at the right end (front end side) of the housing 106 so as to be connected to the housing chamber 106a along the central axis N '. Containment room 106
c is a space surrounded by a truncated conical surface for inserting the composite optical member 105 shown in FIG. 3, and is configured such that the diameter decreases toward the front end along the central axis N ′. Have been. In addition, the front and rear ends of the accommodation chamber 106c have first and second regulation receiving portions 106j formed of cylindrical surfaces,
106k (regulation receiving surface).

The diameter of the first regulation receiving portion 106j is the same as the diameter of the cylindrical portion 105j (diameter D) of the composite optical member 105 (see FIG. 3).
1) is set to a dimension that can be fitted with high accuracy. Also, the diameter of the second regulation receiving portion 106k is
5 is set to a predetermined dimension that is shorter than the diameter D2 (see FIG. 4) of a circumscribed circle that circumscribes the tip of each projection 105k 'provided at the rear end 105k.

A positioning portion for positioning the composite optical member 105 in the direction of the optical axis N, that is, an abutting surface 106c 'is formed at the front end of the accommodation chamber 106c.
Further, an entrance / exit opening which is opened forward, that is, a circular opening 106f is formed in the abutting surface 106c 'of the accommodation chamber 106c so that the first diffraction grating 105f provided in the composite optical member 105 is exposed. Has become.

FIG. 8 shows the accommodation chambers 106a and 106c.
A U-shaped hole-shaped position regulating groove 106d, which is cut out forward from the rear end of the accommodation chamber 106a, is formed in the middle lower wall portion so as to penetrate the outer wall of the cylindrical body 106g. Further, from the rear end of the position regulating groove 106d,
A wide guide groove 106d 'is formed so as to connect to the opening edge of the cylindrical body and penetrate the outer wall of the cylindrical body 106g.

The width of the position restricting groove 106d is set to a predetermined size such that the outer diameter of the position restricting projection 105m provided on the composite optical member 105 can be fitted with high precision.

Further, the cylindrical body 10 covering the through hole 106d is formed.
An arrangement surface 106e for disposing the light receiving member 104 is formed on the outer wall surface of 6g. And the mounting part 10
6h and 106i are the mounting surfaces 106 provided respectively.
h 'and 106i' are formed integrally with the cylindrical body 106g so as to provide a step higher than the arrangement surface 106e.

The block used for the housing 106 is not only an aluminum die-cast but also a zinc die-cast.
It may be made of a magnesium alloy or another metal.

Next, referring mainly to FIG.
06 two wavelength laser diode 102, light receiving member 10
4 and the assembled state of the composite optical member 105 will be described.

First, the composite optical member 105 is inserted through the mounting hole 106b of the housing 106, and the surface of the incident surface 105a except for the diffraction grating 105h is uniformly pressed by a predetermined jig (not shown). , Its base part 1
05c is fitted into the accommodation room 106c. Further, when the composite optical member 105 is pressed, the outer edge of the emission surface 105b abuts against the abutting surface 106c 'formed in the housing chamber 106c of the housing 106, and positioning with respect to the housing 106 in the direction of the central axis N' is performed. You.

At this time, the cylindrical portion 105j provided on the base portion 105c fits into the first regulation receiving portion 106j of the storage chamber 106c.
The cylindrical surface 105j 'of the cylindrical portion 105j of FIG.
) Comes into contact with the first regulation receiving portion 106j, and the base portion 10
The position of the front end of 5c in the direction perpendicular to the optical axis N is regulated with high accuracy.

The rear end portion 105k is press-fitted into a second regulation receiving portion 106k provided in the accommodation room 106c. At this time,
As shown in FIG. 12, each of the protrusions 105k 'formed on the outer peripheral surface of the rear end 105k is in a state of being uniformly crushed, and the front end surface (restriction surface) of each of the protrusions 105k' is in the second control position. The rear end 1 of the base portion 105c contacts the receiving portion 106k.
The position of the composite optical member 105 in the direction orthogonal to the optical axis N at 05k is regulated with high accuracy.
06c is prevented from coming off. In this manner, the position of the composite optical member 105 in the direction perpendicular to the optical axis N is regulated at the front end and the rear end thereof, whereby the composite optical member 10
When the housing 5 is inserted into the housing 106, the optical axis N can be mounted accurately without tilting.

In the above-described press-fit state, the protruding portion 105k 'is crushed, so that a part of the press input received from the second regulation receiving portion is buffered by the deformation of the protruding portion so that the press input more than necessary can be performed by the composite optical member. Thus, distortion of the optical function part, that is, the second diffraction grating 105g and the three-beam diffraction grating 105h can be prevented. Furthermore, each protrusion 10
A space 105 which is a buffer region is provided between 5k 'and the second diffraction grating 105g and the three-beam diffraction grating 105h.
Since s (see FIGS. 3, 4, and 12) are formed, the force applied by the press-in force in the direction of the optical function unit can be further buffered by the space 105s, and the distortion of the optical function unit can be more reliably reduced. Can be prevented.

On the other hand, the position regulating projection 105m formed on the composite optical member 105 is
It is inserted from the opening of the guide groove 106d 'formed in 6g. When the composite optical member 105 is pushed forward in the direction of the optical axis N and is accommodated in the accommodation chamber 106c, the position regulating protrusion 105m is guided by the guide groove 106d 'and fits into the position regulation groove 106d. In this state, the position of the base portion 105c in the rotation direction around the optical axis N is regulated with high accuracy in this state.

In this manner, the position of the composite optical member 105 with respect to the housing 106 in the direction orthogonal to the optical axis N, the position in the rotation direction around the optical axis N, and the position in the direction of the optical axis N are regulated. It has become so. The optical axis N coincides with the central axis N 'of the base 106g of the housing 106.

Next, the two-wavelength laser diode 102
The side of the cap 102e (see FIG. 2) is the housing 1
06 into the accommodation room 106a, and the stem 10a is positioned such that the rotational position of the stem 102a around the optical axis N with respect to the housing 106 is located at a predetermined initial position.
The outer peripheral portion on the side of the one flat portion 102a 'in 2a is press-fitted into a mounting hole 106b formed in the housing 106, so that the outer peripheral portion is fixed to the housing 106. At this time, as shown in FIG. 14, the concave groove 102h formed in the stem 102a is disposed so as to face the center of the V-shaped groove 106m formed in the mounting hole 106b of the housing 106. I have.

As described above, the housing 106 in which the composite optical member 105 and the two-wavelength laser diode 102 are incorporated.
As shown in FIG. 13, the tip surface 1 of the laser chip 103 built in the two-wavelength laser diode 102
03 'and the incident surface 105a of the composite optical member 105 are arranged in parallel and at a predetermined interval.
The two-wavelength laser diode 102 is arranged such that the optical axis of the laser beam 103a 'emitted from the laser beam 3a (see FIG. 2) coincides with the optical axis N of the composite optical member 105 (the axis coincides with the optical axis N of the stem 102a). Are fixed in a positioned state.

After the two-wavelength laser diode 102 is mounted on the housing 106, the laser light 1 emitted from each of the light sources 103a and 103b will be described later.
03a ', 103b' return light 103a'-2, 103
The rotational position of the two-wavelength laser diode 102 around the optical axis N is adjusted so that b'-2 can be received in an optimal state at the predetermined position P of the light receiving element 104a of the light receiving member 104.

The light receiving member 104 is
The light receiving window 104b 'of 4b is disposed in a state of being inserted into a through hole 107a provided in the printed circuit board 107, and the external connection terminal 104c is soldered to a land (not shown) formed on the surface of the printed circuit board 107. To be fixed to the printed circuit board 107. If necessary, the package 104b may be connected to the printed circuit board 107 or the housing 106.
It may be fixed by an adhesive or the like and reinforced.

The printed circuit board 107 to which the light receiving member 104 is fixed has the light receiving window 104b '
6 are placed on the mounting surfaces 106h 'and 106i' of the mounting portions 106h and 106i in a state where they are arranged so as to face the position regulating grooves 106d formed in 6, and are fastened and fixed to the housing 106 by screws 108. You.

The printed circuit board 107 on which the light receiving member 104 is mounted is positioned at a predetermined position before adjusting the rotational position of the two-wavelength laser diode 102 around the optical axis N, and then the mounting surfaces 106h 'and 106i are adjusted. ′.

Next, D by the optical pickup device 100
The reproduction operation of VD62 and CD61 will be described.

In the above configuration, when reproducing the DVD 62, as shown in FIG. 1, the laser beam 103 emitted from the light source 103a of the two-wavelength laser diode 102 is used.
a ′ transmits through the three-beam diffraction grating 105 h formed on the entrance surface 105 a of the composite optical member 105 and is converted into three beams, then transmits through the first diffraction grating 105 f, and exits from the exit surface 1.
05b.

Then, the laser beam 103a 'is deflected at an angle of 90 degrees by a reflection mirror 300 arranged at an angle of 45 degrees with respect to the traveling direction of the laser beam 103a', and is disposed above the reflection mirror 300. The light is incident on the collimating lens 400. The collimated lens 400 converts the laser beam 10 into substantially parallel light.
3a 'enters the objective lens 200 and the objective lens 200
Is focused on the information recording surface of the DVD 62.

Thereafter, the laser beam (return light) 103a 'reflected by the DVD 62 passes through the objective lens 200 and the collimator lens 400 again, is reflected by the reflection mirror 300, and then enters the return light incidence surface, ie, the emission surface shown in FIG. 105
b, which is a first-order diffracted light that is incident on the first diffraction grating 105f formed at b and is diffracted at a predetermined diffraction angle.
a'-2. The return light 103a'-2 is further reflected on a return light reflection surface 105d "formed on the composite optical member 105, enters the cylinder surface 105i, and returns to the return light emission surface 105.
It is emitted from p. Then, the emitted return light 103a '
-2 passes through the position regulating groove 106d (see FIGS. 8 and 11) and enters the light receiving position P in the light receiving element 104a of the light receiving member 104.

At this time, the return light 103a'-2 received by the light receiving element 104a is photoelectrically converted to a DV.
The reproduction signal is generated by converting the current output corresponding to the signal on the information recording surface of D62 into a voltage signal, output from the external connection terminal 104b of the light receiving member 104, and transmitted to the outside through the printed circuit board 107. A part of the return light 103a'-2 received by the light receiving element 104a is used for focus and tracking control.

On the other hand, when reproducing the CD 61, the laser beam 103b 'emitted from the light source 103b of the two-wavelength laser diode 102 is diffracted by three beams formed on the incident surface 105a of the composite optical member 105 as shown in FIG. After being transmitted through the grating 105h and converted into three beams, the light is transmitted through the first diffraction grating 105f and emitted from the emission surface 105b. Then, the laser beam 103b 'is guided to the objective lens 200 as in the case of the DVD 62, and
By the light condensing action of 00, an image is formed on the information recording surface of the CD 61.

Thereafter, the return light 103 reflected by the CD 61
b ′ is the objective lens 200 and the collimating lens 40 again.
After passing through 0 and being reflected by the reflection mirror 300, the light is incident on the first diffraction grating 105f and becomes return light 103b'-2, which is the first-order diffracted light diffracted at a predetermined diffraction angle. The return light 103b'-2 is further reflected by the return light reflecting surface 105d "formed on the composite optical member 105 and enters the cylinder surface 105i.

The return light 10 on the cylinder surface 105i
3b'-2 is provided with astigmatism for focus control, exits the return light exit surface 105p, and receives the position regulating groove 106d.
(See FIGS. 8 and 11) and is received at the light receiving position P of the light receiving element 104a. At this time, the light receiving element 104a
The return light 103b'-2 received at step (1) is photoelectrically converted, so that a current output corresponding to the signal on the information recording surface of the CD 61 is converted into a voltage signal to generate a reproduction signal. The signal is output from the terminal 104b and transmitted to the outside through the printed circuit board 107. Also, return light 103b'-
Part of 2 is used for focus control by the astigmatism method and tracking control by the three-beam method.

In the optical pickup device 100, the laser light 103a 'emitted from the emission surface 105b,
A wavelength filter or the like for regulating the diameter of the light beam 103b 'may be provided in the optical path between the emission surface 105b and the objective lens 200.

Next, the function of the composite optical member 105 will be described.

As shown in FIG. 13, the composite optical member 10
5, a laser beam 103a 'emitted from the emission surface 105b,
DVD62 and CD61 for 103b 'respectively
Return light 103a'-2 is diffracted by the first diffraction grating 105f formed on the emission surface 105b.
And 103b'-2. At this time, since the return light 103b'-2 corresponding to the CD 61 has a longer wavelength than the return light 103a'-2 corresponding to the DVD 62,
The diffraction angle of b'-2 is larger than the diffraction angle of the return light 103a'-2 (a diffraction grating uses the principle that the longer the wavelength, the larger the diffraction angle).

By utilizing the difference between the diffraction angles, the laser beam 103a ', 103b' whose distance between the optical axes was D before being diffracted is returned to the return light reflecting surface 105.
When the return lights 103a'-2 and 103b'-2 return to "d", the arrival positions of both light beams coincide with each other.

However, the return light 103a'-2 and the return light 103a '
Simply reflecting 3b'-2 causes the incident angles of the two laser beams to be different, so that the two return lights 103a'-2 and 103b'-2 are directed to the light receiving position P of the light receiving element 104a so as to coincide with each other. It is not possible. To correct this, a second diffraction grating 105g is provided on the return light reflecting surface 105d ". That is, the return lights 103a'-2 and 103b'-2 incident on the second diffraction grating 105g are re-wavelength. Light reflection surface 1 using the difference in diffraction angle due to the difference in
Return light 103a'-2 and 103 reflected at 05d "
The optical axes of both b'-2 are matched.

Thus, the first diffraction grating 105f
Return lights 103a'-2 and 103 diffracted at
b′-2 can be corrected so that both light are received at the light receiving position P of the light receiving element 104a.
Even when using the light receiving members a and 103b, the light receiving member 104 having one light receiving element 104a can receive both laser beams.

Next, the adjustment of the rotational position of the two-wavelength laser diode 102 around the optical axis N will be described.

As described above, the return light 10 shown in FIG.
The rotational position of the two-wavelength laser diode 102, which is a light emitting member, is adjusted around the optical axis N so that 3a'-2 and 103b'-2 can receive light in an optimal state at the light receiving position P of the light receiving element 104a. ing. This adjustment is performed, for example, by returning light 103a'-2, 103 received by the light receiving element 104a.
By observing a signal obtained by photoelectrically converting b'-2 into a voltage, the optimum position of the two-wavelength laser diode 102 in the rotation direction can be determined by setting this signal to a predetermined level.

For this adjustment, adjustment is performed using an adjustment jig 110 shown in FIG. The adjusting jig 110 has a shaft portion 111 having an operation piece 111a at its tip.
And a grip 112 in which the shaft 111 is coaxially fixed. As shown in FIG. 14, the cross section of the operation piece 111a is tapered at one end 111a 'and at the other end of the square.
11a ".

At the time of adjustment, as shown in FIG. 14, the operation piece 111a is placed so that the one end 111a 'and the other end 111a "of the operation piece 111a are arranged in the V-shaped groove 106m and the concave groove 102h, respectively. After that, when the stem 102a is rotated and adjusted in the direction of arrow B (clockwise) in FIG. 15, for example, the operation piece 111a is inserted into the V-shaped groove 106m.
The grip portion 112 of the adjusting jig 110 is manually operated to pry in the direction A (counterclockwise) in FIG.

Then, one end 111 of the operation piece 111a
a 'is securely supported at the V-shaped bottom of the V-shaped groove 106m so as to substantially become a pivot point, and the other end 111a "
By pressing the inner wall surface on the upper side in the figure h, the stem 102a can be slightly rotated in the B direction against the press input, and the position adjustment of the two-wavelength laser diode 102 around the optical axis N can be easily performed. And with high accuracy.

In the present embodiment, as described above, the optical axis of the DVD laser light 103a 'is
2a, the output optical axis of the laser beam 103a 'is not displaced in the direction orthogonal to the optical axis N when the rotation of the stem 102a is adjusted.
Since the outgoing optical axis b 'is only rotationally displaced about the axis of the stem 102a, the adjustment parameters can be reduced and the rotational position adjustment can be performed more easily.

As described above, the laser beam 103 for the CD 61
b 'and a two-wavelength laser diode 102 for emitting a laser beam 103a' for the DVD 62, and the adjustment work has been improved so that the return light of both laser beams must be received by one light receiving element 104a. The present invention can be suitably applied to the composite optical unit 101.

Although the adjustment jig 110 has been described as being used for manual operation, the invention is not limited to this. For example, a jig for automatically operating the operation piece 111a may be used.

As described above, according to the present embodiment, as shown in FIG. 1, the housing 106 is attached to the optical pickup 100.
, A two-wavelength laser diode 102, a light receiving member 104, and a composite optical member 105 are attached and fixed. The two-wavelength laser diode 102 emits a laser diode 103a that emits a short-wavelength laser for DVD and emits a long-wavelength laser for CD. Composite optical member 1 having laser diode 103b
Reference numeral 05 denotes an incident surface 105a on which light emitted from the two-wavelength laser diode 102 is incident and an emission surface 105b on which light is emitted.
And an optical disk D1 (D
First diffraction grating 105 that diffracts the return light reflected in 2)
f, and a return light reflecting surface 105d "for reflecting the return light diffracted by the first diffraction grating 105f to the light receiving member 104. The return light reflecting surface 105d" receives light having different wavelengths together. Since the second diffraction grating 105g for forming an image with the optical axis coincident with the light receiving position P is provided, one composite optical unit 101 can be used for the optical pickup device 100 using two different wavelengths. The number of the light receiving members 104 may be one, and
It is only necessary to adjust only the position and adjust the position, so that the cost in the adjustment step does not increase.

The two-wavelength laser diode 102 has a stem 102a, a cap 102e, and a glass plate 102f.
The light receiving member 104 includes a package 104b having a built-in light receiving element 104a and an external connection terminal 104c provided on the package 104b. Since the composite optical unit 101 is made up of components that are inexpensively manufactured individually, the handling of each component is easy, and the work of assembling the housing 106 is easy. Costs and process costs can be reduced.

Further, the composite optical member 105 is made of an inexpensive resin, and the first and second diffraction gratings 105f and 105g, the three-beam diffraction grating 105h, the cylinder Since the surface 105i and the surface 105i are integrally formed at the same time, the molding time can be reduced, and the manufacturing cost of the composite optical member 105 can be further reduced.

Further, as described in this embodiment,
The composite optical unit 101 on which the composite optical member 105 of the present invention is mounted has an optical disk 6 on which the objective lens 200 is mounted.
1 (62) Optical pickup device 1 for recording or reproducing
00 is also applicable.

In this embodiment, as shown in FIG. 2, two light sources 103a having different wavelengths as light emitting members are provided.
Although the two-wavelength laser diode 102 having the 103b is used, the present invention can be applied to a case where a light-emitting member having three or more light sources having different wavelengths is used.

[0094]

As described above, according to the present invention,
An attachment structure for attaching a light emitting member to a housing, wherein the light emitting member is integrally formed of a light source, a package including the light source, and an external connection terminal provided on the package, and the package has a cylindrical stem. A housing portion is formed in the housing to fit and house the light emitting member in the axial direction of the stem, and the stem is pressed into the housing portion so that the light emitting member is orthogonal to the axis. Attached to the housing in a state where it is positioned in the direction, the housing has a supporting portion that can support one end of the adjusting jig as a fulcrum and can displace the other end freely, and the stem has A locking portion capable of locking the other end portion of the adjusting jig is provided, and the other end portion presses the locking portion by operating the adjusting jig, thereby causing the stem to operate. By rotating the stem about the axis against the pressure input to adjust the rotational position of the light emitting member about the axis, the stem can be adjusted in a direction orthogonal to the axis of the stem. With the light-emitting member positioned and fixed in the housing, the position of the light-emitting member can be adjusted only by rotating the adjusting jig and adjusting the stem alone in only one direction. It has an effect that can be easily performed.

Further, the locking portion is a concave groove formed on the outer peripheral surface of the stem in the axial direction of the stem, and the support portion is notched on the inner wall surface of the housing portion facing the concave groove. The V-shaped groove is formed, the opening of the V-shaped groove is wider than the opening of the concave groove, and the adjusting jig has the one end and the other end at both ends. When the operating piece is provided, the operating piece can be inserted so that the one end and the other end are respectively disposed in the V-shaped groove and the concave groove, and the adjusting jig is used for twisting operation. The one end is supported by the V-shaped bottom of the V-shaped groove, and the other end is capable of pressing the inner wall of the groove. To V
The adjustment mechanism can be simplified because it is only necessary to provide the U-shaped groove. In addition, since the support portion formed in the housing portion is a V-shaped groove, one end of the operation piece can be securely supported so that the rotation fulcrum does not move, and the adjustment operation can be further facilitated.
In addition, since the operation piece of the adjusting jig is inserted into these grooves and the position of the light emitting member is adjusted by twisting the adjusting jig, fine rotation adjustment can be easily performed and adjustment work can be performed. There is an effect that can be performed more easily.

Further, the light emitting member and the light receiving member are integrally fixed to the housing accommodating the composite optical member to form a composite optical unit, and the light emitting member has the two light sources arranged side by side. Light having different wavelengths respectively emitted from the two light sources is emitted from the light emitting member in the axial direction of the stem, and the composite optical member has an optical axis in the axial direction of the stem and both ends in the optical axis direction. The surface has an incident surface and an exit surface for the two lights, respectively, and the housing has an entrance / exit port formed so that the exit surface is exposed, and the two lights emitted from the light emitting member are incident on the surface. Incident on the surface and emitted from the emission surface, irradiates the two emitted lights to the outside of the housing through the entrance / exit port, and causes both return lights from the outside to enter the emission surface and pass through the composite optical member. The light receiving part in the process The composite optical member is deflected in the direction described above, and the return light is received by the light receiving member, and the adjusting jig is operated so that the return light is received at a predetermined position of the light receiving member. By adjusting the rotational position of the light-emitting member about the axis, it is possible to easily emit light even in a two-wavelength-compatible composite optical unit that requires more precise position adjustment of the light-emitting member. The effect that the position of a member can be adjusted is produced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an optical pickup device 100 according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional perspective view of a two-wavelength laser diode 102 according to the embodiment of the present invention.

FIG. 3 is a composite optical member 105 according to an embodiment of the present invention.
FIG.

FIG. 4 is a left side view of FIG. 3;

FIG. 5 is a right side view of FIG. 3;

FIG. 6 is a view as seen from a direction 6 in FIG. 3;

FIG. 7 is a plan view of the housing 106 according to the embodiment of the present invention.

8 is a sectional view taken along line 8-8 in FIG. 7;

FIG. 9 is a left side view of FIG.

FIG. 10 is a right side view of FIG.

FIG. 11 is a view as viewed from a direction 11 in FIG. 8;

FIG. 12 is a partial sectional view taken along line 12-12 in FIG. 1;

FIG. 13 is a composite optical member 10 according to an embodiment of the present invention.
FIG. 5 is an explanatory diagram for explaining a function of No. 5;

FIG. 14 is an explanatory diagram showing a state where the stem 102a is attached to the attachment hole 106b.

FIG. 15 is an explanatory diagram for explaining how the rotational position of the light emitting member 102 is adjusted.

FIG. 16 is a perspective view of the adjustment jig 110.

FIG. 17 is a partial perspective view of a conventional optical pickup device 50.

[Explanation of symbols]

 Reference Signs List 61 CD (optical disk) 62 DVD (optical disk) 100 optical pickup device 101 composite optical unit 102 two-wavelength laser diode (light emitting member) 102a stem 102h concave groove 103a, 103b light source 104 light receiving member 104a light receiving element 105 composite optical member 105a incident surface 105b Emission surface 105d ″ Return light reflection surface 105f First diffraction grating 105g Second diffraction grating 105h Three-beam diffraction grating 105j ′ Cylindrical surface (restriction surface) 105k ′ Projection 105m Position restriction projection 105p Return light emission surface 105s Space Portion 106 Housing 106c Storage chamber 106c 'Abutment surface (positioning portion) 106d Position regulating groove 106d' Guide groove 106f Input / output port 106j First regulated receiving portion (regulated receiving surface) 106k Second regulated receiving portion (regulated receiving surface) 106 V-shaped grooves 110 adjustment jig 111a operating piece 200 objective lens 300 reflecting mirror 400 collimating lens 500 carriage (pickup body)

Claims (3)

[Claims] 1. A mounting structure for mounting a light emitting member on a housing, wherein the light emitting member is integrally formed of a light source, a package including the light source, and an external connection terminal provided on the package. Is provided with a cylindrical stem, a housing portion is formed in the housing to fit and accommodate the light emitting member in the axial direction of the stem, the stem is pressed into the housing portion, and the light emitting member is Attached to the housing in a state where it is positioned in a direction perpendicular to the axis, the housing has a support portion that supports one end of the adjustment jig as a fulcrum and can displace the other end. The stem is provided with a locking portion capable of locking the other end of the adjusting jig, and the other end presses the locking portion by operating the adjusting jig. The light emitting member mounting structure, wherein the stem is rotated around the axis against the pressure input acting on the stem to adjust the rotational position of the light emitting member around the axis. . 2. The locking portion is a concave groove formed on the outer peripheral surface of the stem in the axial direction of the stem, and the support portion is notched on an inner wall surface of the housing portion facing the concave groove. The V-shaped groove is formed, the opening of the V-shaped groove is wider than the opening of the concave groove, and the adjusting jig has the one end and the other end at both ends. When the operating piece is provided, the operating piece can be inserted so that the one end and the other end are respectively disposed in the V-shaped groove and the concave groove, and the adjusting jig is used for twisting operation. The mounting structure according to claim 1, wherein the one end is supported by a V-shaped bottom of the V-shaped groove, and the other end is capable of pressing an inner wall of the groove. 3. A composite optical unit, wherein the light emitting member and the light receiving member are integrally fixed to the housing in which the composite optical member is accommodated, and the light emitting member has two light sources arranged side by side. Light having different wavelengths emitted from the two light sources is emitted from the light emitting member at predetermined intervals in the axial direction of the stem, and the composite optical member has an optical axis in the axial direction of the stem, and The two end surfaces in the axial direction respectively have an entrance surface and an exit surface for the two lights, and the housing is formed with an entrance / exit port where the exit surface is exposed, and the two light exits from the light emitting member. Light is incident on the incident surface and emitted from the exit surface, and the two emitted lights are radiated to the outside of the housing through the entrance / exit port, and both return lights from the outside are incident on the exit surface to form the composite optics. In the process of passing through the member, The adjusting jig is deflected in the direction of the optical member, emitted from the composite optical member, receives both return lights at the light receiving member, and receives both return lights at a predetermined position of the light receiving member. The light emitting member mounting structure according to claim 1 or 2, wherein the rotational position of the light emitting member around the axis can be adjusted by the operation of (1).