JPH0545549A - Method for fitting optical component to optical pickup and optical component fixation structure - Google Patents

Abstract

PURPOSE:To facilitate the assembling operation and improve the reliability by positioning and fixing a lens and a laser beam source body which constitute optical components in one body across a spacer. CONSTITUTION:The laser beam source body 4 is provided at a specific position on a substrate 1 and the collimator lens 10, a prism 11, a 1st beam splitter 11a, a filter 20, 2nd and 3rd beam splitters 12 and 12a, etc., which constitute plural optical components are provided along the optical axis of laser beam 9 and fixed to the substrate 1 with an adhesive. The laser beam source body 4 and collimator lens 10 are coupled previously in one body across the spacer 101 and an adhesive part 101a to constitute one unit. Namely, the laser beam source body 4 and collimator lens 109 are constituted into the unit, so the assembly of the optical components is made easy and speedy and disordering resulting from temporary fixation and sealing resin is reducible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of attaching an optical component to an optical pickup and a structure for fixing an optical component, and more particularly, a lens and a laser light source body or a light receiving body forming the optical component are integrally formed via a spacer. The present invention relates to a new improvement for positioning and fixing, facilitating assembly and improving reliability.

[0002]

2. Description of the Related Art There are various optical pickups of this type that have been conventionally used, but as a representative one, there is a well-known optical pickup configuration shown in FIG. That is, what is denoted by reference numeral 1 in FIG. 4 is a substrate, and a plurality of seats 2 having a predetermined interval D are formed on the surface of the substrate 1. Between each seat 2,
The mounting recesses 3 are formed, and the installation recesses 6 and 7 formed outside the seats 2 at both ends are provided with a laser light source body 4 made of a semiconductor laser and a reflection mirror 5. .

A collimating lens 10, a prism 11 and a beam splitter 12 as optical components are provided on each of the mounting recesses 3, and the collimating lens 1 is provided.
0, the prism 11, the semiconductor laser 4, and the reflection mirror 5 have their mounting positions and intervals D determined by the seats 2.

[0004]

Since the conventional optical pickup is constructed as described above, there are the following problems. That is, since each optical component is provided at a predetermined position with a seat formed in advance on the substrate as a guide, each optical component cannot be fixed at a position other than each predetermined position. If the axes are not uniform, it is extremely difficult to assemble the parts while aligning the optical axes. Further, since the lens and the laser light source body or the light receiving body are temporarily fixed, there is a deviation due to the adjustment. Further, the position of each optical component may be misaligned due to the injection and solidification shrinkage of the sealing resin.

The present invention has been made to solve the above problems. In particular, the lens and the laser light source body or the light receiving body, which are optical components, are integrally positioned and fixed via a spacer, An object of the present invention is to provide an optical component mounting method and an optical component fixing structure for an optical pickup, which facilitates assembly and improves reliability.

[0006]

An optical component mounting method for an optical pickup according to the present invention is the optical component mounting method for an optical pickup, wherein a plurality of optical components are provided on a substrate and surface mounting is performed. In this method, each optical component is fixed via a spacer.

More specifically, each of the optical components is composed of a lens and a laser light source body.

More specifically, each of the optical components is composed of a lens and a light receiver.

Further, the optical component fixing structure according to the present invention has a structure in which a plurality of optical components are integrally coupled via a spacer.

More specifically, the optical component is composed of a lens and a laser light source body.

More specifically, the optical component is composed of a lens and a light receiver.

[0012]

In the method of attaching an optical component to the optical pickup and the optical component fixing structure according to the present invention, the lens and each optical component such as the laser light receiving member or the light receiving member are integrally combined in advance at predetermined intervals through the spacer. Therefore, it becomes easy to attach the optical pickup to a predetermined position on the substrate to form the optical pickup, and it is possible to obtain easy assembly and improved reliability.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an optical component mounting method and an optical component fixing structure to an optical pickup according to the present invention will be described in detail below with reference to the drawings.

The same or equivalent portions as those of the conventional example will be described using the same reference numerals. 1, 2 and 3 show an optical component mounting method and an optical component fixing structure to an optical pick-up according to the present invention. FIG. 1 is a sectional view showing the assembled optical pickup, and FIG. 2 is a plan view of FIG. 3 and 4 are configuration diagrams showing a state at the time of assembly.

The reference numeral 1 in the drawing is, for example, a substrate made of phosphor bronze having a thickness of about 0.5 mm,
The surface 1a of the substrate 1 is formed flat.

A laser light source body 4 made of a semiconductor laser is provided at a predetermined position on one end 1b side of the substrate 1, and a plurality of optical components are arranged from the end 1b side of the substrate 1 toward the other end 1c side. Collimating lens 10 and prism 1
1, the first beam splitter 11a, the filter 20, the second and third beam splitters 12 and 12a, the first condenser lens 22, the fourth beam splitter 23, and the second condenser lens 22a are laser beams of the semiconductor laser 4. 9 is provided along the optical axis of the optical component 9 and the bottom surfaces 11aA, 20
A, 12A, 12aA, 22A (optical component shown in FIG. 1) and the surface 1a are fixed via an adhesive 100. Further, the laser light source body 4 and the collimator lens 10 are integrally combined in advance via the first spacer 101 and the adhesive portion 101a to form one unit. The first spacer 101 is composed of a pair of rods or cylinders.

Since the thickness of the adhesive 100 is about several microns, the adhesive 100 has a structure of direct connection, and FIG.
As shown by, the entire optical component is covered with the sealing resin 40 and surface-mounted.

Further, the first beam splitter 11a
A reflection mirror 60 is provided adjacent to the reflection mirror 60, and an objective lens 80 is provided above the reflection mirror 60. In addition, the condenser lenses 22 and 2 on the end surface of the substrate 1
First and second light receiving bodies 70 and 71 are provided at the opposite positions of 2a. Further, the first light receiving body 70 and the first condensing lens 22, and the second light receiving body 71 and the second condensing lens 22a are integrally combined in advance through the second spacer 102 and the adhesive portion 102a. Make up the unit.
The second spacer 102 is composed of a pair of rods or a cylinder.

Therefore, the laser light 9 emitted from the laser light source 4 and converted into parallel rays through the collimator lens 10 passes through the prism 11, the beam splitter 11a, etc., which are the respective optical components, and the reflection mirror 60 and the objective lens. The reflected light from the optical disk (not shown) entering from the optical disk 80 is reflected by each optical component 11a, 20, 1 and.
2, 23, 22a, 12a, 22 and the like, and then the light receiving body 7
By receiving light at 0 and 71, the structure of FIGS. 1 and 2 constitutes an optical pickup.

Next, a case of assembling the optical pickup shown in FIGS. 1 and 2 will be described. First, as shown in FIG. 3, the laser light source body 4 and the collimator lens 10 which are integrally combined are installed at a predetermined position on the surface 1a of the substrate 1 with an adhesive 100, and then the laser is formed on the surface 1a of the substrate 1. The integrated laser light receiving body 4 and the second collimating lens 10 are adjusted so as to obtain parallel rays of the light source body 4. Moreover, the coordinate plate 50 shown in FIG. 3 is placed in front of the other end 1c of the substrate 1 with the optical axis of the laser beam 9 which is the parallel light beam obtained by the collimating lens 10 running in the space on the substrate 1. The optical axis of the laser beam 9 is set to match a predetermined coordinate 50a of the coordinate plate 50. Further, the integrated second light receiving body 71 and the condenser lens 22a are also fixed on the substrate 1 as described above.

By repeating the above-described method, the optical components 11, 11a, 20, 12, 22 and the like are mounted on the substrate 1 one after another, and each time the optical axes of the components 11 to 22 and the like are penetrated. And the optical axis of the laser beam 9 are adjusted so that they are fixed to the substrate 1 with an adhesive 100. Therefore, the adhesive 100 is provided only on the bottom surface of each optical component, and the coordinate plate 50 does not require the adhesive in the side direction through which light passes.
The optical axis and the optical axis of the component can be perfectly aligned with each other on the coordinates 50a, and simple and highly accurate assembly can be performed. The lens 10 and the laser light source body 4 or the lenses 22 and 22a and the light receivers 70 and 71 are connected to the spacer 10 as described above.
The configuration in which 1,102 are integrally connected can be sold as a single unit. In addition, in the above-mentioned embodiment, the case where the laser light source body (4) or the light receiving bodies 70, 71 and the lens 10 are integrated through the spacers 101, 102 has been described, but not only these optical components but also other The same effect can be obtained when the optical components are integrated.

[0022]

Since the optical component mounting method and the optical component fixing structure according to the present invention are configured as described above, the following effects can be obtained. That is, since the laser light source body and the lens or the light receiving body and the lens are configured in advance as a single unit through the spacer and the adhesive portion, the assembly of this optical component becomes easy and quick, and, as in the conventional case, It is possible to improve the reliability of the optical pickup itself by eliminating the error caused by the temporary fixing and the error caused by the injection of the sealing resin and the solidification shrinkage.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part showing an optical component mounting method and an optical component fixing structure to an optical pick-up according to the present invention, showing an optical pickup after assembly.

FIG. 2 is a plan view of FIG.

FIG. 3 is a configuration diagram showing a fixed state.

FIG. 4 is a sectional view showing a conventional optical pickup.

[Explanation of symbols]

 1 Substrate 4 Laser Light Source 10 Optical Component 12 Optical Component 12a Optical Component 22 Optical Component 70 Photoreceptor 71 Photoreceptor 101 Spacer 102 Spacer

Claims (6)

[Claims] 1. A method of mounting an optical component on an optical pickup in which a plurality of optical components are provided on a substrate (1) and surface mounting is performed, and each optical component is fixed via a spacer (101, 102). A method for mounting an optical component on an optical pickup, characterized by. 2. The method of mounting an optical component on an optical pickup, wherein each of the optical components comprises a lens (10) and a laser light source body (4). 3. The optical component comprises a lens (10) and a photoreceptor (70,7).
1) The method of attaching an optical component to an optical pickup according to claim 1, characterized in that 4. An optical component fixing structure comprising a plurality of optical components integrally coupled via spacers (101, 102). 5. The optical component fixing structure according to claim 4, wherein the optical component comprises a lens (10) and a laser light source body (4). 6. The optical component comprises a lens (10) and a photoreceptor (70,
71) and the optical component fixing structure according to claim 4.