JPH04190205A - Optical-parts assembling method - Google Patents

Abstract

PURPOSE:To achieve miniaturization by loading optical parts so that the optical axis thereof may be in match with the axis of a laser light, and fixing by adhesion all the optical parts to the substrate. CONSTITUTION:After a semiconductor laser 4 and a collimator lens 10 are installed at a specified position of the surface of a substrate 1, they are adjusted so as to obtain parallel light rays of the laser 4 on the surface of the substrate 1. A co-ordinate plate 50 is disposed at a position forward of the other end 1c of the substrate, and is so set that an optical axis of a laser light 9 may coincide with a specific co-ordinate position 50a of the plate 50. Optical parts 11 and the like are sequentially loaded on the substrate 1 and, each time such loading is done, they are adjusted that an optical part axis of light passed through the optical parts 11 and the like may be in match with the optical axis of the laser light 9. Thereafter, the parts are fixed to the substrate 1 with use of a light transmission adhesive agent.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for assembling optical components, and in particular, the present invention relates to a method for assembling optical components, and in particular, to aligning the optical axis of a laser beam to an optical component without providing a seat for positioning the optical component on a substrate. This invention relates to a novel improvement for achieving miniaturization through simple and highly accurate assembly by aligning the optical axis of components.

[Conventional technology]

There are various types of optical pickups of this type that have been used in the past, but a typical example is the configuration of the well-known optical pickup shown in FIG.

That is, what is indicated by the reference numeral 1 in FIG. 3 is a substrate, and on the surface of this substrate 1, a plurality of seats 2 are formed at predetermined intervals.

A mounting recess 3 is formed between each seat 2, and a semiconductor laser 4 and a reflecting mirror 5 are provided in installation recesses 6.7 formed at the outer positions of each seat 2 located at both ends. It is being

A collimating lens 10, a prism 11 and a beam splitter 12 as optical components are disposed on each of the mounting recesses 3.
etc. are provided, and a collimating lens 10. The mounting positions and intervals of the prism 11, semiconductor laser 4, and reflection mirror 5 were determined by each floor 2.

[Problem to be solved by the invention]

Since the conventional optical pickup was configured as described above, the following problems existed.

In other words, since each optical component is installed in a predetermined position using a pre-formed seat on the substrate as a guide, each optical component cannot be fixed in any other position than its respective predetermined position, which makes it difficult to reduce the overall size. It was impossible.

The present invention has been made to solve the above-mentioned problems, and in particular, it is possible to align the optical axis of a laser beam with the component optical axis of an optical component without providing a seat for positioning the optical component on the board. It is an object of the present invention to provide a method for assembling optical components that can achieve miniaturization through simple and highly accurate assembly.

[Means to solve the problem]

In the optical component assembly method according to the present invention, a laser beam, which is a parallel beam of light that is run in a space on a substrate and obtained by an optical component, is set as an optical axis, and the optical component is aligned so that the component optical axis of the optical component is aligned with the optical axis. In this method, the optical components are mounted on the substrate, and all the optical components are adhesively fixed to the substrate.

More specifically, the optical component is composed of a plurality of optical components, and each optical component is directly adhesively fixed.

More specifically, the method uses a coordinate plate to align the optical axis and the component optical axis.

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

[For production]

In the method for assembling optical components according to the present invention, a laser beam, which is a parallel beam from a semiconductor laser, obtained through a collimating lens, which is an optical component, is made to run through a space above a substrate to form an optical axis. The optical component is mounted on the device, and the optical axis and the component optical axis are aligned with the coordinates of the coordinate plate that the optical axis is hitting, so the optical axis and component optical axis can be aligned extremely easily and with high precision. be able to.

Furthermore, since each optical component is directly connected via adhesive, the axial length and overall shape of the assembled product can be significantly smaller than before.

〔Example〕

Hereinafter, preferred embodiments of the optical component assembly method according to the present invention will be described in detail with reference to the drawings.

Note that the same or equivalent parts as in the conventional example will be described using the same reference numerals.

1A, 1B, and 2 show an optical component assembly method according to the present invention, in which FIG. 1A is a plan view showing the optical pickup after assembly, FIG. 1B is a sectional view of FIG. 1A, Second
The figure is a configuration diagram showing an assembled state.

1st rI! The reference numeral 1 in I is, for example, a substrate made of phosphor bronze with a thickness of about 0.5-1, and the surface 1a of this substrate 1 is formed flat.

A semiconductor laser 4 is provided at a predetermined position on one end lb side of the substrate 1, and a collimating lens 10 forming a plurality of optical components from one end 1b side of the substrate 1 to the other end Ic side, Prism 11, first beam splitter 11a
, filter 20. second and third beam splitters 12,
12a, a first condenser lens 22, a fourth beam L, a splitter 23, and a second condenser lens 22a are provided in a Wi layer along the optical axis of the laser beam 9 of the semiconductor laser 4.

Each of the beam splitters 11a, 12.12a.

23. Each optical component such as each condenser lens 22, 22a and prism 11 is integrally connected via a translucent adhesive 30, and the thickness of this translucent adhesive 30 is about several microns. Therefore, in addition to being directly connected, each optical component is entirely covered with a sealing resin 40, as shown in FIG. 1B.

Furthermore, a reflecting mirror 60 is provided adjacent to the first beam splitter lla, and an objective lens 80 is provided above this reflecting mirror 60.

Further, the condenser lens 22 on the end surface of the substrate 1.
First and second light receivers 70, 71 are provided at positions opposite to 22a.

Therefore, the laser beam 9 emitted from the semiconductor laser 4 and converted into a parallel beam via the collimating lens 10 is transmitted to the prism 11 and beam splitter 11, which are the optical components.
The light enters an optical disc (not shown) from the reflecting mirror 60 and the objective lens 80 through the optical components 11a, 20, 12, 23, and 22a.
, 12a.

1A and 1B constitutes an optical pickup.

Next, the case of assembling the optical pickup shown in FIGS. 1A and 1B will be described.

First, the semiconductor laser 4 and the collimating lens 10 are placed on the substrate 1.
After installing it at a predetermined position on the surface 1a of the substrate 1, the surface 1a of the substrate 1 is
The semiconductor laser 4 and the first collimating lens 10 are adjusted so as to obtain parallel light beams from the semiconductor laser 4 above. In addition, while the laser beam 9, which is a parallel beam obtained by the collimating lens 10, is running in the space above the substrate 1, the coordinate plate 50 shown in FIG. 2 is placed in front of the other end IC of the substrate 1. The optical axis of the laser beam 9 is at a predetermined coordinate 50 on the coordinate plate 50.
Set to match a.

By repeating the above method, each optical component 11, ll
After mounting the optical components a, 20, 12, 22, etc. one after another on the substrate 1, and adjusting each time so that the component optical axis passing through each optical component 11 to 22, etc. and the optical axis of the laser beam 9 are aligned. , and fixed to the substrate 1 with a transparent adhesive 30.

Therefore, the optical axis and the optical axis of the component can be perfectly aligned on the coordinate 50a of the coordinate plate 50, allowing easy and highly accurate assembly.

In the above-mentioned embodiment, the case of an optical pickup was described, but the present invention is not limited to an optical pickup and can be applied to other optical component application products.

〔Effect of the invention〕

Since the optical component assembly method according to the present invention is configured as described above, the following effects can be obtained.

In other words, since each optical component is assembled so that the optical axis of the laser beam of the semiconductor laser and the component optical axis of each optical component are aligned, it is not necessary to provide positioning means such as a seat on the surface of the substrate as in the past. This eliminates the need for assembly, making it possible to obtain highly accurate optical axis alignment, and at the same time, to achieve miniaturization of the overall shape.

[Brief explanation of the drawing]

1A, 1B, and 2 show the optical component assembly method according to the present invention, in which 1A[N is a plan view showing the optical pickup after assembly, FIG. 1B is a sectional view of FIG. 1A, FIG. 2 is a configuration diagram showing an assembled state, and FIG. 3 is a configuration diagram showing a conventional optical pickup. 1 is a substrate, 9 is a laser beam, 10, 11. lla. 12.20... are optical components.

Claims (4)

[Claims] (1) The laser beam (9), which is a parallel beam of light that is run in the space above the substrate (1) and obtained by the optical component (10), is the optical axis, and the optical components (11, 11a, 12, 20, . . . The optical components (11, 11a, 1
2, 20...) on the substrate (1), and all the optical components (10, 11, 11a, 12, 20...)
A method for assembling optical components, characterized in that: is adhesively fixed to the substrate (1). (2) The optical components (10, 11, 11a, 12, 20,
) consists of a plurality of optical components (10, 11, 11a
, 12, 20, . . . ) are directly adhesively fixed. (3) The optical component assembly method according to claim 1 or 2, characterized in that alignment of the optical axis and the component optical axis is performed using a coordinate plate (50). (4) The optical components (10, 11, 11a, 12, 20,
. . ) constitutes an optical pickup.