JP2003317307A - Light emitting/receiving unit and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting/receiving unit in which characteristics just before assembly are grasped and a degree of integrating respective components is improved by reducing thickness and locating respective light receiving elements 10a-12a to orient their light receiving planes in different directions. <P>SOLUTION: The light emitting/receiving unit is provided with a first optical component mounting part 1 wherein a light beam radiation source 2, a light beam splitting means 3 and a light beam path change means 5 are mounted within a recess 1a and a second optical component mounting part 9 wherein a film-like circuit board 14 is stuck on the surfaces of first holding plates 10-12 having the light receiving elements 10a-12a and of a second holding plate 13 such that their bonding portions can be bent. The light source 2 is conductively connected to the film-like circuit board 14, the first holding plates 10-12 are bent to turn the light receiving planes of the respective light receiving elements 10a-12a in the mutually different directions, and are mutually located to make a light beam split by the light beam splitting means 3 incident on any corresponding one of the light receiving elements 10a-12a, and the first holding plates 10-12 and the second holding plate 13 in the second optical component mounting part 9 are stuck on the first optical component mounting part 1. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting / receiving unit and a method of manufacturing the same, and more particularly, to a small-sized light used for writing information on an optical recording medium and / or reading recorded information on the optical recording medium. The present invention relates to a light emitting / receiving unit suitable for a pickup device and a method for manufacturing the same.

[0002]

2. Description of the Related Art Recently, in an optical pickup device,
In order to reduce the size and weight of the device, a means for integrating the respective constituent parts has been introduced. As an example, a "magneto-optical pickup device" disclosed in Japanese Patent Laid-Open No. 10-143934 (hereinafter This device is called a first configuration example)
"Optical pickup device and optical recording medium driving device including the same" disclosed in JP-A-10-241186
(Hereinafter, this device is referred to as a second configuration example) and the like are known.

Here, FIG. 8 is a side view showing a magneto-optical pickup device according to the first configuration example.

As shown in FIG. 8, in the magneto-optical pickup device of the first configuration example, a laser diode 81 serving as a light beam radiation source and a photo diode 82 for detecting an error signal are provided inside a housing 80. 83, a photodiode 84 for detecting an information signal, and a photodiode 85 for monitoring are formed on the surface of the silicon substrate 86, and the opening portion of the housing 80 is sealed with a glass cover 87 having a hologram element 87a. On the glass cover 87, a composite prism 90 in which a polarization prism 88 including a polarization separation film 88a having different light reflectance and light transmittance for P-polarized light and S-polarized light and a Wollaston prism 89 are integrated is arranged. The objective lens 91 is arranged on the compound prism 90. Further, a magneto-optical disk 92 is mounted and arranged at a position facing the objective lens 91.

In the magneto-optical pickup device of the first configuration example, the silicon substrate 86 arranged in the housing 80.
A plurality of light receiving elements, that is, photodiodes 82 and 83 for detecting an error signal, a photodiode 84 for detecting an information signal, and a photodiode 85 for a monitor are formed and arranged on the same surface so as to be on the same plane. The optical paths of the light beams are branched and split into the diodes 82 to 85 by using the polarization prism 88, the hologram element 87a, etc., and the necessary light beams are incident on the photodiodes 82 to 85, respectively. There is.

Further, FIGS. 9A and 9B show an optical pickup device according to the second configuration example and a light emitting / receiving unit in an optical recording medium driving device including the same, and FIG. 9A shows the same. The disassembled perspective view, (b) is the external appearance perspective view.

As shown in FIG. 9A, the light emitting / receiving unit (synonymous with the light emitting / receiving unit) is an upper frame 10.
1, a main frame 102, and a lower frame 103. In the upper frame 101, the first photodiode (first light receiving element) 104 is arranged on the recessed supporting surface 101a, and in the main frame 102, the semiconductor laser element (light emitting element) 105 and the transmission are formed on the recessed supporting surface 102a. Type 3 division diffraction grating 1
06, transmission hologram element 107, upper reflection mirror 10
8, the lower reflection mirror 109 is arranged, and the lower frame 103 has the second photodiode (second light receiving element) 110 arranged on the same recessed support surface 103a.

These three frames 101 to 103
After the respective position adjustments are made, the main frame 10
The upper frame 10 is provided on the upper surface of 2 (on the side where the supporting surface 102a is formed).
The lower surface of 1 (the side on which the supporting surface 101a is not formed) is attached and fixed to the lower surface of the main frame 102 (the side on which the supporting surface 102a is not formed) and the upper surface of the lower frame 103 (the side on which the supporting surface 103a is formed). As shown in FIG. 12 (b), the frames 101 to 103 are integrated to form a light emitting / receiving unit.

[0009]

Generally, an optical pickup device is equipped with two or more light-receiving elements, and the number of light-receiving elements mounted to further enhance the control function tends to increase. When the number of light-receiving elements mounted in the optical pickup device increases and the degree of integration of the light-receiving elements increases, a part of the light beam incident on the other light-receiving elements enters each light-receiving element, that is, stray light. Will occur.

By the way, in the magneto-optical pickup device according to the first configuration example, the photodiode (for controlling light quantity) 85 for monitoring and the photodiode 8 for detecting an error signal are used.
2, 83 and the photodiode 84 for detecting the information signal are arranged in the same plane. In such an arrangement, these photodiodes 82 to 8
In No. 5, since the respective light receiving surfaces are in the same direction, it is easy to pick up unnecessary stray light. Then, in these photodiodes, a photodiode 85 for controlling the amount of light is included.
In the case of including, it is difficult to improve the accuracy of the light amount control due to the generation of the stray light.

In order to avoid the generation of such stray light, when the photodiode 85 for controlling the light amount is attached, the mounting position is selected so that the stray light does not enter the photodiode 85 for controlling the light amount, or the light amount control is performed. The mounting surface of the photodiode 85 for use with other photodiodes 82 to 8
It may be possible to devise such as tilting the mounting surface of No. 4 by a predetermined angle (right angle, etc.), but this kind of sticking work is suitable for mounting multiple photodiodes on the same plane. Compared to this, the efficiency is greatly reduced.

The light emitting / receiving unit according to the second configuration example has a plurality of photodiodes (light receiving elements) 104 and 11.
When 0 is attached, the light-receiving surfaces of the photodiodes are oriented in different directions, and the light-receiving surfaces of the plurality of photodiodes 104 and 110 are oriented in different directions. An upper frame 101 and a lower frame 103 are used in addition to the main frame 102, and the upper frame 101 and the main frame 10 are arranged in the thickness direction of the light emitting / receiving unit.
2. The lower frame 103 is attached in a state of being overlapped. When the upper frame 101, the main frame 102, and the lower frame 103 are stacked in three stages,
The thickness of the light emitting / receiving unit becomes thick, and it becomes difficult to configure a small optical pickup device by integration.

When it is desired to increase the number of photodiodes used, that is, the first photodiode 104.
When it is desired to use another photodiode in addition to the second photodiode 110, it is necessary to use another frame in addition to the three frames 101 to 103, and as a result, the thickness of the light emitting / receiving unit is reduced. The thickness of the optical pickup device becomes thicker, and the thickness of the optical pickup device becomes thicker.

In addition to this, the first configuration example and the second configuration example
The optical pickup device according to the configuration example supplies the output signal extracted from each light receiving element to one signal processing board when the optical pickup is driven. Therefore, the output signal derived from each light receiving element is supplied to the film circuit. It is necessary to collectively supply them to a side-by-side line group using a substrate or the like, but in such a configuration, an optical pickup device is assembled,
The assembled optical pickup device cannot detect the electrical characteristics of the optical pickup device until the output signal derived from each light receiving element is supplied to the signal processing circuit substrate through the film-like circuit substrate. If the state of the electric characteristics of 1 is not preferable, it is necessary to adjust the arrangement position of each light receiving element.

Further, the optical pickup devices according to the first configuration example and the second configuration example are positioned between the reference surface of the optical pickup device and the reference surface of the light emitting / receiving unit when the optical pickup device is assembled. A shift may occur, and the output signal of the light receiving element may change due to the influence of the shift. Further, in the case of the type in which the light beam is shaped by the casing in the first configuration example or the shaping prism attached to the outside of the light emitting / receiving unit in the second configuration example, Alternatively, the distribution of the intensity of incident light on the light receiving element inside the light emitting and receiving unit in the second configuration example may change due to the influence of the positioning error of the shaping prism, which causes a change in the output signal of the light receiving element. become.

The present invention has been made in view of the above technical background, and an object thereof is to arrange a plurality of light-receiving elements such that their light-receiving surfaces face different directions without increasing the thickness. However, you can grasp the characteristics just before assembly,
Another object of the present invention is to provide a light emitting / receiving unit and a method for manufacturing the same, in which the degree of integration of each component is improved.

[0017]

In order to achieve the above object, the present invention provides at least a light source which emits a light beam,
One or more light beam branching means for branching the light beam and one or more optical path changing means for bending and changing the optical path of the light beam are attached to the first optical component mounting portion and the light receiving element, respectively. Also, a film-like circuit board is attached to the surface of the one or more second holding plates to which the two or more first holding plates and the light-receiving element are not attached so that the joint portion of the first holding plate and the second holding plate is bendable. And a light receiving surface of another light receiving element attached to two or more first holding plates, the light source being conductively connected to a land provided on the film-like circuit board. Each first holding plate is bent so as to face a direction different from the light receiving surface, and the light beam branched from any one or more of the light beam branching means is bent directly or by one of the one or more optical path changing means. Are arranged so that they are incident on the corresponding light receiving element. To comprises means configured so as to adhere the second optical component mounting portion first holding plate and a second holding plate of the first optical component mounting unit.

According to the above-mentioned means, the first optical component mounting portion on which various optical components other than the light receiving element are mounted, the two or more first holding plates to which the light receiving element is attached, and the light receiving element are not attached. And a second optical component mounting portion configured such that a film-shaped circuit board is attached to the surface of one or more second holding plates, and a joint between the first holding plate and the second holding plate is bendable. ,
When attaching the first optical component mounting portion and the second optical component mounting portion, first, the light source is conductively connected to the land provided on the film-shaped circuit board, and then attached to the two or more first holding plates. Each first holding plate is bent so that the light-receiving surface of the attached light-receiving element faces a direction different from the light-receiving surface of another light-receiving element, and a light beam branched from any one or more of the light beam branching means is then applied. The first optical component mounting portion and the first optical component mounting portion are arranged so that they are bent either directly or by one or more optical path changing means and are incident on the corresponding light receiving elements.
Since the holding plate and the second holding plate are attached, it is possible to arrange a plurality of light receiving elements at positions most suitable for the respective light receiving elements on a plurality of different arrangement surfaces, and the number of light receiving elements used. The light receiving and emitting units can be appropriately arranged in a preferable state without increasing the thickness of the light emitting and receiving unit, and the degree of integration of the components in the light receiving and emitting unit is high and they are not arranged in the same plane. At this time, it is possible to prevent deterioration of efficiency due to sticking of each light receiving element or conductive connection, and it is possible to grasp the electrical characteristics of the output signal from the light receiving element in the same state as that of the assembled optical pickup device.

In this case, the two or more first holding plates of the second optical component mounting portion in the above-mentioned means are those to which the film-like circuit board is attached in a state in which the light receiving surfaces of all the light receiving elements face the same direction. Is.

With such a structure, it becomes easy to attach a plurality of light receiving elements or to electrically connect them, and
Even if the light receiving elements are not attached to the holding plates arranged orthogonally to each other, the light receiving elements can be arranged on the holding plates arranged orthogonally to each other, and the attachment operation function and the conductive connection operation function are improved. It is possible to improve the degree of freedom of arrangement.

Further, the first optical component mounting portion in the above-mentioned means has two or more openings for guiding the light beam emitted from the light source from the first optical component mounting portion. At least one is sealed by a means for collimating a light beam.

According to this structure, it is possible to eliminate the change in the incident state of the light beam on the light receiving element due to the arrangement error between the collimator lens and the light source, and the inside of the first optical component mounting portion. Can be completely sealed.

Further, the first optical component mounting portion in the above-mentioned means has two or more openings through which the light beam emitted by the light source is led out from the first optical component mounting portion, and at least one of the openings is provided. Is designed to be sealed by a means for collimating the light beam and a means for shaping the light beam.

With such a configuration, the position of the light receiving element is adjusted after the collimator lens and the shaping prism for shaping the light beam are mounted in advance, so that the light is reflected by the optical medium and the like when the collimator lens is emitted. Then, a shaping prism that causes a change in the shape of the light beam depending on the time of returning to the original position can be integrated, and each light receiving element can function optimally. Further, the inside of the light emitting / receiving unit can be completely sealed by the collimator lens and the shaping prism.

Further, the first optical component mounting portion and the second optical component mounting portion in the above means have a cylindrical positioning concave portion on one of their attaching surfaces and a cylindrical convex portion having a diameter smaller than the concave portion on the other side. Are formed.

With this structure, the concave portion is formed in one of the first optical component mounting portion and the second optical component mounting portion, and the convex portion is formed in the other, so that the position adjustment of the light receiving element is performed. Setting the initial position of is easy.

Further, the first optical component mounting portion in the above means is an extension surface parallel to the mounting surface of the light source, a condensing means for condensing the light beam emitted from the light source onto the optical recording medium, and a condensing means. Drive means for moving the means in the radial direction of the optical recording medium, and the drive means is assembled to the first optical component mounting portion with the extension surface as a reference surface.

According to this structure, the first optical component mounting portion serves as a reference for the driving means for moving the light collecting means in the radial direction of the optical recording medium, and therefore the inclination of the light collecting means is adjusted. The adjustment can be performed with reference to one surface of the mounting portion, and the assembling accuracy of the light collecting means can be improved.

In the manufacturing method of the above-mentioned means,
Mounting a light source, one or more light beam branching means, and one or more optical path changing means in the recess of the optical component mounting portion;
The first optical component mounting portion is attached to the first holding plate while mutually adjusting the positions of the light receiving elements attached to the respective first holding plates of the second optical component mounting portion and the projection positions of the light beams on the light receiving elements. Alternatively, the light emitting / receiving unit is manufactured through a step of sticking to one of the second holding plates.

With such a configuration, it is possible to eliminate the fluctuation of the incident position of the light beam on each light receiving element due to the variation of the arrangement state of the optical components, and to mount the first optical component mounting portion and the second optical component mounting portion. It is possible to prevent the occurrence of a shift in the incident state of the light beam on each light receiving element that occurs when the parts are attached.

Further, in the manufacturing method of the above means, when the first optical component mounting portion is attached to the second optical component mounting portion, the first optical component mounting portion is temporarily attached to the second optical component mounting portion. The step, the step of adhering a part of the film-shaped circuit board of the second optical component mounting portion to the corresponding part of the first optical component mounting portion, and the light source and all the light receiving elements are continuous to the land provided on the film-shaped circuit board. The step of completely affixing the first optical component mounting portion to the second optical component mounting portion is performed through the step of electrically conductively connecting.

According to this structure, before the first optical component mounting portion and the second optical component mounting portion are bonded together, a part of the film-shaped circuit board of the second optical component mounting portion is covered with the first optical component. By sticking to the corresponding part of the component mounting portion, the light source and the light receiving element can be conductively connected to the film-like circuit board at the same time, and the conductive connection step can be performed quickly and efficiently.

In the manufacturing method of the above-mentioned means,
When attaching the optical component mounting portion to the second optical component mounting portion,
A step of temporarily attaching the first optical component mounting portion to the second optical component mounting portion, and a step of attaching a part of the film-shaped circuit board of the second optical component mounting portion to a corresponding portion of the first optical component mounting portion. When,
Conductive connection of the light source to the land provided on the film-like circuit board, driving the light source, reflecting the light beam emitted from the light source by an external light reflector, and condensing the reflected light beam at that time While observing the position, the step of adjusting and fixing the position of the corresponding light beam branching means is performed, and then the step of completely attaching the first optical component mounting portion to the second optical component mounting portion is executed.

According to this structure, after the light source is conductively connected to the film-like circuit board, the position of the light beam branching means is adjusted while the light source is emitting light.
It is possible to reduce the error in the incident position of the light beam in the focal direction after the light beam is branched by the light beam branching means.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 relates to a first embodiment of a light emitting / receiving unit according to the present invention, and is a perspective view showing a main configuration of a first optical component mounting portion.

As shown in FIG. 1, the first optical component mounting portion 1 divides the light beam into a recess 1a formed so that various optical components can be mounted, a light source 2 for emitting a light beam, and a light beam. Light beam splitter (light beam splitting means) 3
And a light beam diffracting element 4 and a surface reflection type 45-degree mirror (light path changing means) 5 for changing the optical path of the light beam. The light source 2, the light beam splitter 3, the light beam diffracting element 4, and the surface reflection. Each of the mold 45-degree mirrors 5 is mounted in the concave portion 1a of the first optical component mounting portion 1. The optical component placement member 1 includes a first light beam emission port 6 on the front wall of the recess 1a, a second light beam emission port 7 on one side wall of the recess 1a, and another side wall of the recess 1a. Third light beam exit 8
Is provided.

In this case, the first light beam exit 6 is an exit through which the light beam LA emitted from the light source 2 is emitted straight from the first optical component mounting portion 1 to the outside. The mouth 7 is a light beam LA emitted from the light source 2.
The light beam LB obtained by bending and reflecting the light beam at a right angle by the light beam splitter 3 is attached to the first optical component mounting portion 1
The light beam LA emitted from the first light beam emission port 6 is an emission port for emitting the light beam LA from the optical pickup device to the outside.
The light beam is reflected by the optical disc), the reflected light beam returns to the light beam splitter 3, and the light beam LC obtained by bending and reflecting again in the perpendicular direction is emitted from the first optical component mounting portion 1 to the outside. . Further, when the light beam LA emitted from the light source 2 is reflected by a reflecting object outside the optical pickup device and the reflected light beam returns to the light beam diffraction element 4, a part of the reflected light beam is diffracted by the light beam. The light is diffracted by the element 4 and goes to the surface reflection type 45-degree mirror 5 as a diffracted light beam. The diffracted light beam is reflected again by the surface reflection type 45-degree mirror 5 and projected as a light beam LD in the height direction (y direction) of the first optical component mounting portion 1.

In the first optical component mounting portion 1,
An example is shown in which the light beam splitter 3 is used as the light beam branching means and the surface reflection type 45 degree mirror 5 is used as the light path changing means, but an equivalent function is achieved instead of the light beam splitter 3 as the light beam branching means. Means capable of achieving the same function may be employed instead of the surface reflection type 45-degree mirror 5 as the optical path changing means.

The light beam splitter 3, which is a light beam splitting means, is formed of a polarization beam splitter having characteristics of different light transmittance and light reflectance depending on the type of polarization, and a birefringent material for the polarization beam splitter. It may be a composite optical element in the form of a composite of the above polarization separation elements. Similarly, the light beam diffractive element 4 as the light beam branching unit may be a light beam diffractive element having a function of splitting the incident light beam into a plurality of parts, a function of converting the divergence angle of the incident light beam, and the like. Good. Further, as the surface reflection type 45 degree mirror 5 which is the optical path changing means, an internal reflection type 45 degree mirror may be used.

Next, FIG. 2 is a perspective view showing a configuration of a main part of a second optical component mounting portion according to the first embodiment of the light emitting / receiving unit according to the present invention. It is attached to the optical component mounting portion 1.

As shown in FIG. 2, the second optical component mounting portion 9 includes three first holding plates 10, 11, 12 and one second holding plate 13 and three first holding plates. Boards 10 to 12 and 1
The film-like circuit board 14 attached to each surface of the second holding plates 13 and the film-like circuit board 1 of the first holding plate 10.
4 Light-receiving element 10a attached to the attachment surface side, film-shaped circuit board 14 of the first holding plate 11, light-receiving element 11a attached to the attachment surface side, and film-shaped circuit board of the first holding plate 12 14 and a light receiving element 12a attached to the attachment surface side. The film-like circuit board 14 is provided with land groups 15, 16, 17, and 18 at a plurality of positions on the surface, and these land groups 15 to 18 are respectively provided by a wiring group (not shown) formed on the film-like circuit board 14. It is connected to a corresponding drive circuit or the like.

In this case, the land group 15 has eight land parts (no figure number), the land group 16 has six land parts (no figure number), and the land group 17 has three land parts (no figure number). No land), and the land group 18 has two land parts (no figure). In the light receiving element 10a, corresponding portions of its light receiving surface are conductively connected to eight lands by fine metal wire groups (no drawing numbers), and in the light receiving element 10b, corresponding portions of its light receiving surface are six lands. Portions are conductively connected to each other by a fine metal wire group (no figure number), and the light receiving element 10c is conductively connected to three lands at corresponding portions of the light receiving surface by a fine metal wire group (no figure number). To be done. At this time, a gold wire or an aluminum-silicon alloy wire is used as the fine metal wire.

Further, the three first holding plates 10 to 12 and 1
A film-like circuit board 14 is provided on each surface of the second holding plates 13.
When attaching the first holding plate 10 and the first holding plate 11,
The second optical component mounting portion 9 is attached to the joint portion of the holding plates 10 and 12 and the joint portion of the first holding plate 10 and the second holding plate 13 with a gap, respectively. Firstly, each of the first holding plate 11, the first holding plate 12, and the second holding plate 13 can be bent about 90 ° with respect to the first holding plate 10 when the first holding plate 10 is attached. .

The second optical component mounting portion 9 includes the light receiving element 11b.
And the land group 16 are configured so that the size of the portion including the land group 16 is smaller than the diameter of the second light beam emission port 7 formed in the first optical component mounting portion 1. Similarly, the light receiving element 11c and the land group are similarly configured. The size of the portion including 17 and 17 is smaller than the diameter of the third light beam emission port 8 formed in the first optical component mounting portion 1. The reason for this configuration is that, as will be described later, when the second optical component mounting portion 9 is attached to the first optical component mounting portion 1, the portion including the light receiving element 11b and the land group 16 is By inserting the portions including the light receiving element 11c and the land group 17 into the aperture of the second light beam emission port 7 into the aperture of the third light beam emission port 8, respectively, This is because the first holding plates 11 and 12 can be attached to the corresponding side surfaces of the first optical component mounting portion 1 without any gap.

In the second optical component mounting portion 9, the first holding plate 10 to which the light receiving element 11a is attached and the light receiving element 11 are attached.
Since the first holding plate 11 to which b is attached and the first holding plate 12 to which the light receiving element 11c is attached have the attachment surfaces parallel to each other, each of the light receiving elements 11a, 11b, and 11c is formed into a film circuit. The operability when conductively connecting to the substrate 14 is improved. That is, in the light receiving and emitting unit according to this embodiment, when the light receiving elements 11a, 11b and 11c are electrically connected, the light receiving elements 11a, 11b and 11c have a positional relationship on the same plane and are electrically connected. In good condition,
On the other hand, when adjusting the position of each of the light receiving elements 11a, 11b, 11c, it is possible to change the light receiving elements 11a, 11b, 11c to a state suitable for position adjustment fixing on the surface where the positional relationship is different from each other. Therefore, it is possible to individually improve the design of the light emitting / receiving unit and the operability at the time of conductive connection of the light receiving elements 11a, 11b, 11c.

In the example shown in FIG. 2, no component is attached to the second holding plate 13, but the film-like circuit board 14 on the second holding plate 13 has a semiconductor laser connected to the light source 2. In the case of using, a high-frequency generation circuit unit for superposing a high frequency on a DC power supply that drives the light source 2 can be mounted.

Further, in the example shown in FIG. 2, the film-like circuit board 14 attached to the respective surfaces of the three first holding plates 10 to 12 and the one second holding plate 13 has the first No openings are provided in the joints between the holding plate 10 and the other holding plates 11, 12, and 13, respectively.
In order to enhance flexibility when bending each of the first holding plate 11, the first holding plate 12, and the second holding plate 13, a joint portion between the first holding plate 10 and the other holding plates 11, 12, 13 Each of them may be provided with a long elliptical opening extending along their joint.

Next, FIGS. 3 and 4 are perspective views showing a manufacturing process when the first optical component mounting portion 1 and the second optical component mounting portion 9 are adhered to each other to form a light emitting / receiving unit. 3 shows the initial state, and FIG. 4 shows the final state.

In FIGS. 3 and 4, 19 is a cylindrical convex portion provided on the first optical component mounting portion 1, and 20 is a cylindrical concave portion provided on the first holding plate 10 of the second optical component mounting portion 9. In addition, the same components as those shown in FIGS. 1 and 2 are designated by the same reference numerals.

In this case, the cylindrical convex portion 19 and the cylindrical concave portion 20 are for positioning to the adjustment start position (predetermined position at the time of designing the light receiving element), and the diameter of the cylindrical convex portion 19 is a cylinder. The recess 20 is formed to have a diameter smaller than that of the recess 20.

Here, the manufacturing process of this light emitting / receiving unit will be described with reference to FIGS.

First, as shown in FIG. 3, the second holding plate 13 of the second optical component mounting portion 9 shown in FIG. 2 is provided on the back surface of the first optical component mounting portion 1 shown in FIG. Abut
The film-shaped circuit board 14 extending outward from the second holding plate 13 is bent along the back surface of the first optical component mounting portion 1, and the protruding portion where the land group 18 is formed
It is attached in the vicinity of the portion where the light source 2 is arranged in the concave portion 1a of the optical component mounting portion 1.

Next, the light source 2 and the corresponding land portion of the land group 18 are conductively connected by a metal wire (no drawing number).

Next, in a state where the light source 2 and the corresponding land portion of the land group 18 are conductively connected, the joining portion of the first holding plates 10 and 11 and the joining of the first holding plates 10 and 12 in the film-like circuit board 14 are joined. Section, first holding plate 10 and second holding plate 1
The joint portions of 3 are bent by approximately 90 °, and the second holding plate 13 is provided on the back surface of the first optical component mounting portion 1, and the first holding plates 11 and 12 are provided on both side surfaces of the first optical component mounting portion 1. The first optical component mounting portion 1 is covered by folding the second optical component mounting portion 9 so that the first holding plate 10 is placed on the upper surface of the first optical component mounting portion 1. At this time, the cylindrical convex portion 19 provided on the first optical component mounting portion 1 is replaced by the second optical component mounting portion 9
The first optical component mounting portion 1 and the first holding plate 10 are positioned at the adjustment start position by fitting into the cylindrical recess 20 provided in the first holding plate 10.

Subsequently, as shown in FIG. 4, the first optical component mounting portion 1 is covered with the folded second optical component mounting portion 9 to temporarily form the light emitting / receiving unit, and then the light source 2 is caused to emit light.
The position of the light receiving element 10a or the like that requires position adjustment is adjusted.
In this adjustment, for example, when it is necessary to adjust the position of the light receiving element 10a on the first holding plate 10, a concave portion or a convex portion (not shown) provided on the first holding plate 10 is used.
Using a dedicated arm (not shown) whose tip engages with, move the light receiving element 10a for each first holding plate 10,
The position of the light receiving element 10a is adjusted so that the predetermined signal output from the light receiving element 10a is obtained via the film-shaped circuit board 14. Similarly, other light receiving elements 11a, 1
Adjust the position of 2a. These light receiving elements 10a, 1
When the adjustment of the positions of 1a and 12a is completed, the second optical component mounting portion 9 is sealed so as to seal the inside of the first optical component mounting portion 1.
Is attached and fixed to the first optical component mounting portion 1, and the light emitting / receiving unit is completed.

In the light emitting / receiving unit thus obtained, the first holding plates 11 and 12 and the second holding plate 13 of the second optical component mounting portion 9 have the first optical component mounting portion 1 and the second optical component. Since the light receiving elements 10a and 11 are arranged on the side surface side of the first optical component mounting portion 1 when the mounting portion 9 and the mounting portion 9 are combined.
Not only can the light receiving surfaces of a and 12a be integrated so as to face different directions, the thickness of the light receiving and emitting unit (see FIG.
Of the first optical component mounting portion 1 and the first optical component mounting portion 1
Since it is within the range of the sum of the thickness of the holding plate 10, the degree of integration can be increased without increasing the thickness of the light emitting / receiving unit. In this case, the state of the signal obtained from each light receiving element 10a, 11a, 12a in a state where the light emitting and receiving unit is temporarily formed is determined by an optical pickup device (for example, the simplest one is this light receiving and emitting unit and the same light receiving and emitting unit). It is possible to understand the performance of the light emitting / receiving unit alone, even if the light emitting / receiving unit is a single unit. it can.

A method of manufacturing the light emitting / receiving unit will be described. A part of the film-like circuit board 14 of the second optical component mounting portion 9, that is, the land group 18, is formed with respect to the first optical component mounting portion 1. After sticking the protruding portion on the concave portion 1a, the light source 2 and the respective light receiving elements 10a, 11a, 1
2a and each land group 1 provided on the film-like circuit board 14
If the conductive connection is continuously performed between the electrodes 5, 15, 17, and 18, the conductive connection step can be performed quickly and efficiently.

In addition, for example, in the case where the beam splitter 3 is mounted and fixed in the light beam splitting means mounted on the first optical component mounting portion 1, the light source 2 is connected in a step after the conductive connection of the light source 2 is performed. The emitted light is emitted and projected onto a reflection object (optical disk or the like) outside the light emitting / receiving unit, and the beam splitter 3 is used as the optical axis of the emission light beam from the light source 2 by using the reflected light beam returned from the reflection object. Parallel direction (Z direction)
By adjusting and fixing the position of the
The defocus error when the light beam branched in the direction enters the light receiving surface of the light receiving element 13a can be improved. If a corner reflector is used as an external reflection object, the position of the beam splitter 3 can be easily adjusted regardless of whether the emitted light beam is a parallel light beam or a focused light beam.

In this embodiment, the first optical component mounting portion 1 is provided with the cylindrical convex portion 19, and the first holding plate 10 of the second optical component mounting portion 9 is provided with the cylindrical concave portion 20. However, conversely, a cylindrical recess 20 is provided in the first optical component mounting portion 1, and the first holding plate 10 of the second optical component mounting portion 9 is provided.
Alternatively, the cylindrical convex portion 19 may be provided. Further, when the positioning accuracy between the first optical component mounting portion 1 and the first holding plate 10 is relatively rough, the provision of the cylindrical convex portion 19 and the provision of the cylindrical concave portion 20 are omitted. You may do it.

Next, FIG. 5 relates to the second embodiment of the light emitting / receiving unit according to the present invention, and relates to the first optical component mounting portion 1
It is a perspective view which shows the principal part structure of.

As shown in FIG. 5, the first optical component mounting portion 1 according to the second embodiment is similar to the first optical component mounting portion 1 of the first embodiment shown in FIG. A collimator lens 21 for converting the emitted light beam into a parallel light beam is fitted in the one light beam emission port 6, and other configurations are the same as the first optical component mounting portion 1 of the first embodiment.
Is the same as. In FIG. 5, the same components as those shown in FIG. 1 are designated by the same reference numerals.

When the collimator lens is integrated with the light emitting / receiving unit, the deviation of the positional relationship between the collimator lens 21 and the light source 2 from the design value becomes a problem, but in the second embodiment, the deviation occurs. The light emitting and receiving unit can be configured in such a manner that the influence of the above does not occur.

The first optical component mounting portion 1 according to the second embodiment has the collimator lens 2 at the first light beam emission port 6.
After fitting in 1, the first optical component mounting portion 1 and the second optical component mounting portion 9 are adhered to each other to form a light emitting and receiving unit as described above. For example, the collimator lens 2
The operation of absorbing the error due to the deviation of the positional relationship between the light source 1 and the light source 2 from the design value and bringing the focal position of the returning light to the exit of the opening 8, that is, the position of the beam splitter 3 is adjusted and fixed. After the optical component mounting portion 1 is completed, the light receiving elements in each of the light receiving elements 10a, 11a, 12a that require position adjustment are also deviated from the design value of the positional relationship between the collimator lens 21 and the light source 2. The position can be adjusted and fixed so as to absorb the influence. The inside of the light emitting / receiving unit may be sealed by the collimator lens 21.

Next, FIG. 6 is a perspective view showing a main configuration of the first optical component mounting portion 1 according to the third embodiment of the light emitting / receiving unit according to the present invention.

As shown in FIG. 6, the first optical component mounting portion 1 according to the third embodiment has a height direction (Y in the figure).
When viewed from the axial direction), the entire projected shape of the first optical component mounting portion 1 is a trapezoid, and the emitted light beam is emitted to the first light beam emission port 6 of the first optical component mounting portion 1. A collimator lens 21 for converting into a parallel light beam is fitted, and a shaping prism 22 is attached to the first light beam emission port 6 in the inclined portion of the first optical component mounting portion 1. Other configurations are the same as those of the first embodiment. This is the same as the first optical component mounting portion 1 of the embodiment. Note that, in FIG. 6, the same components as those shown in FIG. 1 are designated by the same reference numerals.

In the first optical component mounting portion 1 according to the third embodiment, the inclination angle θ of the trapezoidal hypotenuse and the shape of the shaping prism 22 are radiated from the glass material and shaping ratio of the shaping prism 22 and the light source 2. It depends on the light beam wavelength.
For example, the wavelength of the light beam emitted from the light source 2 is 405n.
m, the angle formed by the two surfaces is a right angle, and when the shaping prism 22 processed with the glass material BK7 and having a shaping ratio of 1.5 is used, the inclination angle θ shown in FIG. 6 is 23.1 °. The apex angle φ of the shaping prism 22 is 32.8 °.

In the light emitting / receiving unit according to the third embodiment, the collimator lens 21, the collimator lens 21,
After fixing the shaping prisms 22 respectively, the second optical component mounting portion 9 is attached to the first optical component mounting portion 1, and when the light emitted from the light source 2 is emitted from the collimator lens 21, A shaping prism 2 that changes the shape of a light beam when reflected by an optical medium and returned again
Even if 2 are integrated, each light receiving element 10a, 11a, 12a
Regarding the position of the light receiving element in which the position adjustment is necessary, it is possible to fix the position by performing the position adjustment reflecting the change of the light beam shape. The collimator lens 21 and the shaping prism 22 may seal the inside of the light emitting / receiving unit.

Next, FIG. 7 relates to a fourth embodiment of a light emitting / receiving unit according to the present invention, and a pickup device including the light emitting / receiving unit and a means for collecting light emitted from the light emitting / receiving unit. It is a perspective view which shows the principal part structure of.

As shown in FIG. 7, an optical pickup device using the light emitting / receiving unit according to the fourth embodiment is
In addition to the light emitting / receiving unit basically having the same components as the light emitting / receiving unit shown in FIG. 5, a surface reflection type 45 ° mirror 23 as an optical path changing unit and a focusing unit for focusing a light beam on the surface of the optical disk 27. Objective lens 2 as light means
4 and driving means 25 (only a part of which is shown) for driving the objective lens 24. 7, the same components as those shown in FIG. 5 are designated by the same reference numerals.

The light emitting / receiving unit according to the fourth embodiment is obtained by partially changing the shape of the first optical component mounting portion 1 in the light emitting / receiving unit according to the second embodiment. A projecting surface 26 that extends from the portion 1 and is parallel to the mounting surface of the light source 2 is provided, and the driving means 25 that drives the objective lens 24 is assembled on the projecting surface 26 with the projecting surface 26 as a reference.

In this case, the driving means 25 for driving the objective lens 24 is assembled so that the objective lens 24 is parallel to the reference plane of the optical pickup device, and the light beam emitted from the light emitting / receiving unit is emitted. Optical disc 2
The driving means 25 for driving the objective lens 24 for focusing on the surface of the light source 7 can be incorporated in the light emitting / receiving unit with high accuracy.

In each of the above-mentioned embodiments, an example in which the first optical component mounting portion 9 is formed by three first holding plates 10, 11, 12 and one second holding plate 13 will be described. However, the first optical component mounting portion 9 according to the present invention is not limited to the case where it is formed by three first holding plates 10, 11, 12 and one second holding plate 13, and two first holding plates 10, 11 and 12 are used. Alternatively, it may have four first holding plates,
It may have one or more second holding plates.

[0074]

As described above, according to the light emitting and receiving unit of the present invention, the first optical component mounting portion on which various optical components except the light receiving element are mounted, and the two or more light receiving elements are attached. A film-shaped circuit board is attached to the surfaces of two or more second holding plates to which the first holding plate and the light-receiving element are not attached, so that the joint between the first holding plate and the second holding plate can be bent. When the first optical component mounting portion and the second optical component mounting portion are attached using the configured second optical component mounting portion, first, the light source is conductively connected to the land provided on the film-shaped circuit board, Next, each of the first light-receiving elements attached to the two or more first holding plates is arranged so that the light-receiving surface of each light-receiving element faces a different direction from the light-receiving surface of another light-receiving element.
The holding plate is bent, and then the light beam branched from any one of the one or more light beam branching means is bent directly or one of the one or more optical path changing means to enter the corresponding light receiving element. Since the first holding plate and the second holding plate of the second optical component mounting portion are attached to the first optical component mounting portion in such a state that they are mutually arranged, a plurality of light receiving elements are arranged on a plurality of different arrangement surfaces Can be arranged at the most suitable position for each light receiving element, and even if the number of light receiving elements used increases, those light receiving elements are appropriately arranged without increasing the thickness of the light receiving and emitting unit. You can,
A high degree of integration of components in the light receiving and emitting unit, preventing deterioration of efficiency due to sticking of each light receiving element and conductive connection, and assembling the optical characteristics of the output signal from the light receiving element in an optical pickup device. There is an effect that it becomes possible to grasp in the same state as.

Further, according to the method of manufacturing the light emitting / receiving unit of the present invention, the influence of the fluctuation of the incident position of the light beam on each light receiving element due to the variation in the arrangement state of the optical components constituting the light receiving / emitting unit is received. Light beam that can be eliminated when adjusting the position of the element or when creating the first optical component mounting part, and changes the shape of the incident light beam to the light receiving element as in the case where the shaping prism is integrated with the light receiving and emitting unit. There is an effect that it is possible to manufacture a light emitting / receiving unit in which the change of the incident state of is reflected in advance.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part configuration of a first optical component mounting portion according to a first embodiment of a light emitting / receiving unit according to the present invention.

FIG. 2 is a perspective view showing a main part configuration of a second optical component mounting portion according to the first embodiment of the light emitting and receiving unit according to the present invention.

FIG. 3 is a perspective view showing an initial state of a manufacturing process when the first optical component mounting portion and the second optical component mounting portion are attached to each other to form a light emitting / receiving unit.

FIG. 4 is a perspective view showing a state immediately before the end of the manufacturing process when the first optical component mounting portion and the second optical component mounting portion are attached to each other to form a light emitting / receiving unit.

FIG. 5 is a perspective view showing a main part configuration of a first optical component mounting portion according to the second embodiment of the light emitting and receiving unit according to the present invention.

FIG. 6 is a perspective view showing a main part configuration of a first optical component mounting portion according to a third embodiment of a light emitting / receiving unit according to the present invention.

FIG. 7 is a perspective view showing a main part configuration of an optical pickup device using the light emitting / receiving unit according to a fourth embodiment of the present invention.

FIG. 8 is a side view showing a magneto-optical pickup device according to a known first configuration example.

FIG. 9 is a configuration diagram showing an optical pickup device according to a second known configuration example and a light emitting / receiving unit in an optical recording medium driving device including the same.

[Explanation of symbols]

1 First optical component mounting part 1a recess 2 light sources 3 Optical beam splitter (optical beam splitting means) 4 Light beam diffraction element 5,23 Surface reflection type 45 degree mirror (optical path changing means) 6 First light beam exit 7 Second light beam exit 8 Third light beam exit 9 Second optical component mounting part 10, 11, 12 1st holding plate 10a, 11a, 12a Light receiving element 13 Second holding plate 14 Film circuit board 15, 16, 17, 18 Lands 19 Cylindrical protrusion 20 Cylindrical recess 21 Collimator lens 22 Shaped prism 24 Objective lens 25 Drive means 26 Projection surface 27 optical disc

Continued front page    F-term (reference) 5D117 AA02 CC07 HH12                 5D119 AA02 AA20 AA38 BA01 FA33                       FA35 FA37 JC05 JC07 KA41                       KA42 LB01 NA02 PA02                 5D789 AA02 AA20 AA38 BA01 FA33                       FA35 FA37 JC05 JC07 KA41                       KA42 LB01 NA02 PA02

Claims (9)

[Claims] 1. A light source for emitting at least a light beam,
One or more light beam splitting means for splitting the light beam;
A first optical component mounting portion in which one or more optical path changing means for changing the optical path of the light beam is mounted in the recess respectively, and two or more first holding plates and light receiving elements to which the light receiving elements are attached are provided. On the surface of one or more second holding plates that are not attached,
And a second optical component mounting portion in which a film-shaped circuit board is attached so that the joint portion of the first holding plate and the second holding plate is bendable, and the light source is electrically conductive to a land provided on the film-shaped circuit board. The respective first holding plates are bent so that the light-receiving surfaces of the light-receiving elements that are connected and attached to the two or more first holding plates face different directions from the light-receiving surfaces of other light-receiving elements, and the one or more The light beams branched from any one of the light beam branching means are directly arranged or bent by any one of the one or more optical path changing means so as to be incident on the corresponding light receiving element. A light emitting / receiving unit, characterized in that the first holding plate and the second holding plate of the second optical component mounting portion are attached to the optical component mounting portion. 2. The film-shaped circuit board is attached to the two or more first holding plates of the second optical component mounting portion with the light-receiving surfaces of all the light-receiving elements facing in the same direction. The light emitting and receiving unit according to claim 1. 3. The first optical component mounting portion has two or more openings for guiding the light beam emitted by the light source from the first optical component mounting portion, and the inside of the opening portion 3. The light emitting / receiving unit according to claim 1 or 2, wherein at least one of the light emitting / receiving units is sealed by a means for collimating the light beam. 4. The first optical component mounting portion has two or more openings through which the light beam emitted by the light source is led out from the first optical component mounting portion, and at least one of the openings. 3. The light emitting / receiving unit according to claim 1, wherein the light emitting / receiving unit is sealed by means for collimating the light beam and means for shaping the light beam. 5. The first optical component mounting portion and the second optical component mounting portion each have a cylindrical positioning recess on one of their adhering surfaces and a cylindrical protrusion having a smaller diameter than the recess on the other. The light emitting and receiving unit according to claim 1, wherein the light receiving and emitting unit is formed. 6. The first optical component mounting portion has an extension surface parallel to the mounting surface of the light source, a condensing unit that condenses a light beam emitted from the light source onto an optical recording medium, and the concentrator. Drive means for moving the optical means in the radial direction of the optical recording medium, wherein the drive means is assembled to the first optical component mounting portion with the extension surface as a reference surface. An optical pickup device using the light emitting / receiving unit according to any one of 1 to 5. 7. The method of manufacturing a light emitting / receiving unit according to claim 1, wherein the light source, one or more light beam branching means, and one light beam are provided in the recess of the first optical component mounting portion. While mutually adjusting the step of mounting the above-mentioned optical path changing means, the positions of the light receiving elements attached to the respective first holding plates of the second optical component mounting portion, and the projection positions of the light beams onto these light receiving elements. A method of manufacturing a light emitting / receiving unit, comprising the steps of: attaching the first optical component mounting portion to one of the first holding plate or the second holding plate, and manufacturing the light receiving / emitting unit. 8. The method for manufacturing a light emitting and receiving unit according to claim 7, wherein when the first optical component mounting portion is attached to the second optical component mounting portion, the first optical component mounting portion is the The step of temporarily adhering to the second optical component mounting portion,
A part of the film-shaped circuit board of the optical component mounting portion is attached to the first
The first optical component mounting portion is connected to the corresponding part of the optical component mounting portion, and the light source and all the light receiving elements are continuously conductively connected to lands provided on the film-like circuit board. 2. A method of manufacturing a light emitting / receiving unit, wherein a step of completely adhering to the optical component mounting portion is executed. 9. The method for manufacturing a light emitting and receiving unit according to claim 7, wherein when the first optical component mounting portion is attached to the second optical component mounting portion, the first optical component mounting portion is the The step of temporarily adhering to the second optical component mounting portion,
A part of the film-shaped circuit board of the optical component mounting portion is attached to the first
A step of adhering to a corresponding part of the optical component mounting part, a step of electrically connecting the light source to a land provided on the film-like circuit board, a step of driving the light source, And then fixing and fixing the position of the corresponding light beam branching means while observing the converging position of the reflected light beam at that time. 2. A method of manufacturing a light emitting / receiving unit, wherein a step of completely adhering to the optical component mounting portion is executed.