JPH0545543A - Optical component fixing method - Google Patents

Abstract

PURPOSE:To enable easy, high-accuracy assembly without providing any seat for positioning optical components on a substrate by aligning the optical axis of laser beam and the optical axis of the optical components with each other and fixing the bottom surfaces of the optical components with an adhesive. CONSTITUTION:Laser beam which is the parallel light beam from a semiconductor laser 4 obtained through a collimator lens 10 as an optical component is transmitted in the space on the substrate 1 to form an optical axis, on which optical components 11, 11a, 20, 12, 12a, etc., are mounted. Then the optical axis of the laser beam and the optical axes of the optical components are aligned with the coordinates of a coordinate plate where the optical axis of the laser light beam is made incident and the bottom surfaces of the respective optical components 11, 11a, 20, 12, and 12a are fixed to the surface of the substrate 1 with an adhesive. Consequently, even if the surface of the substrate 1 has an error factor such as curvature, waving, and roughness, the optical axes are accurately aligned regardless of them to accurately fix the optical components 11, 11a, 20, 12, and 12a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical component fixing method, and more particularly to aligning an optical axis of a laser beam with an optical axis of a component of an optical component without providing a seat for positioning the optical component on a substrate. The present invention relates to a new improvement for achieving a simple and highly accurate assembly by fixing the bottom surface of an optical component with an adhesive.

[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 recess 3 is formed, and the semiconductor laser 4 and the reflection mirror 5 are provided in the installation recesses 6 and 7 formed outside the seats 2 located at both ends.

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.

The present invention has been made to solve the above problems, and in particular, the optical axis of the laser beam and the component light of the optical component can be provided without providing a seat for positioning the optical component on the substrate. An object of the present invention is to provide an optical component fixing method capable of achieving a simple and highly accurate assembly by aligning the shaft and fixing the bottom surface of the optical component with an adhesive.

[0006]

An optical component fixing method according to the present invention is an optical component fixing method in which an optical component is provided on a substrate and surface mounting is performed, wherein a bottom surface of the optical component and a surface of the substrate are provided. Is a method of fixing with an adhesive.

More specifically, it is a method in which a laser beam traveling in the space on the substrate is used as an optical axis, and the optical component is fixed along the optical axis.

More specifically, the optical component is a method including a plurality of optical components.

More specifically, the optical axis of the optical component and the optical axis of the laser light are aligned using a coordinate plate.

More specifically, the optical component is a method for configuring an optical pickup.

[0011]

In the optical component fixing method according to the present invention, the laser light, which is a parallel light beam from the semiconductor laser obtained through the collimating lens which is an optical component, is made to run in the space on the substrate to form the optical axis, Optical components are mounted on the optical axis, and the optical axis and the optical axis of the component are aligned with the coordinates of the coordinate plate on which the optical axis hits, and the bottom surface of each component is fixed to the surface of the substrate with an adhesive. By doing so, bending on the surface of the substrate,
Even if there are error factors such as undulations and roughness, accurate optical axis alignment can be achieved irrespective of these and accurate fixing can be achieved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the optical component fixing method according to the present invention will be described in detail below with reference to the drawings. The same or equivalent parts as those of the conventional example will be described using the same reference numerals. 1, 2, and 3 show an optical component fixing method according to the present invention. FIG. 1 is a sectional view showing an optical pickup after assembly, FIG. 2 is a plan view of FIG. 1, and FIG. It is a block diagram which shows a state.

1 is a substrate made of phosphor bronze having a thickness of about 0.5 mm, for example, and the surface 1a of the substrate 1 is formed flat.

A semiconductor laser 4 is provided at a predetermined position on the one end 1b side of the substrate 1, and the end 1b of the substrate 1 is provided.
From one side toward the other end 1c side, a collimator lens 10, a prism 11, a first beam splitter 11a, a filter 20, second and third beam splitters 12, 12a, a first condenser lens 22, The fourth beam splitter 23 and the second condenser lens 22a are provided along the optical axis of the laser beam 9 of the semiconductor laser 4, and the bottom surfaces 11aA, 20A, 12A, 12aA, 2 of the respective optical components are provided.
2A (optical component shown in FIG. 1) and the surface 1a between the adhesive 1
It is fixed through 00.

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 receivers 70 and 71 are provided at the opposite positions of 2a.

Therefore, the laser beam 9 emitted from the semiconductor laser 4 and converted into a parallel light beam through the collimating lens 10 passes through the prism 11, the beam splitter 11a and the like, which are the respective optical components, and the reflection mirror 60 and the objective lens 80. From the optical disc 11a, 20, 12,
23, 22a, 12a, 22 and the like, then the photodetectors 70, 7
When the light is received at 1, the structure shown in 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 semiconductor laser 4 and the collimating lens 1
0 is placed on the surface 1a of the substrate 1 at a predetermined position via the adhesive 100, and then the semiconductor laser 4 and the second collimating lens 10 are adjusted so that parallel rays of the semiconductor laser 4 are obtained on the surface 1a of the substrate 1. To do. Moreover, the optical axis of the laser beam 9 which is a parallel light beam obtained by the collimator lens 10 is set to the substrate 1
The coordinate plate 50 shown in FIG. 3 is placed in front of the other end 1c of the substrate 1 while running in the upper space so that the optical axis of the laser beam 9 coincides with a predetermined coordinate 50a of the coordinate plate 50. Set.

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 axis of the component 11 to 22 and the like penetrates the optical component. After adjusting so that the optical axis of the laser beam 9 and the optical axis of the laser beam 9 are aligned, the substrate 100 is fixed with an adhesive 100. Therefore, the adhesive 100 is provided only on the bottom surface of each optical component, and the optical axis and the component optical axis are perfectly aligned on the coordinates 50a of the coordinate plate 50 without the need for an adhesive in the side direction through which light passes. Therefore, the assembly can be performed easily and with high precision. In the above-mentioned embodiment, the case of the optical pickup has been described, but the present invention is not limited to the optical pickup and can be applied to other optical component application products.

[0020]

Since the optical component fixing method according to the present invention is constructed as described above, the following effects can be obtained. That is, while aligning the optical axis of the laser light of the semiconductor laser and the component optical axis of each optical component, the bottom of the optical component is attached to the substrate via the adhesive to assemble the optical component,
Unlike conventional methods, it is not necessary to provide a positioning means such as a seat on the surface of the substrate, assembly is easy, and highly accurate optical axis alignment can be obtained regardless of the properties of the substrate surface. Miniaturization of the shape can be achieved.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an optical pickup after assembly, showing a method for fixing an optical component according to the present invention.

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 9 laser light 10 optical component 11a 〃 12 〃 12a 〃 20 〃 50 coordinate plate 100 adhesive

Claims (5)

[Claims] 1. An optical component (11a, 20, 12, 12a ...) On a substrate (1).
In the optical component fixing method for providing surface mounting, the bottom surface of the optical component (11a, 20, 12, 12a ...) (11aA, 20A,
12A, 12aA ...) and the surface (1a) of the substrate (1) between the adhesive (100)
A method for fixing an optical component, characterized in that the optical component is fixed through the. 2. A laser beam (9) running in a space above the substrate (1)
As an optical axis, and the optical component (11a, 20, 1
2, 12a ...) is fixed, The optical component fixing method according to claim 1, wherein 3. The optical component fixing method according to claim 1, wherein the optical components (11a, 20, 12, 12a ...) Are composed of a plurality of components. 4. The coordinate plate (50) is used to align the optical axes of the optical components (11a, 20, 12, 12a ...) With the optical axes of the laser light (9). The optical component fixing method according to claim 2 or 3. 5. The optical component (11a, 20,12,12a ...) constitutes an optical pickup.
An optical component assembling method according to any one of 1.