JP2001124963A - Light-emitting module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting module, provided with a lens holding block, which is to be utilized in optical communication or the like. SOLUTION: This light-emitting module is provided with a light-emitting element 13, a lens 15 for converging light emitted from the light-emitting element 13, the lens-holding block for holding a lens barrel 16, provided with the lens 15 and the light-emitting element 13 and an optical fiber. The lens-holding block is composed by integrally forming a block main body 21 provided with a block flat part 22 for fixing a chip carrier 14, where the light-emitting element 13 is mounted and a block vertical part 23 extended in a direction orthogonal to the flat part 22 for holding the lens barrel 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting module used for optical communication and the like.

[0002]

2. Description of the Related Art In optical communication, for example, an electric / optical conversion element such as an LD or LED is used as a signal source or a light emitting source. In order to efficiently guide light from these light emitting elements to an optical fiber, an order of μm is used. It is necessary to align the optical system.

[0003] In particular, the connection between a light emitting element mounted on a block called a chip carrier and a lens will be described with reference to FIGS.

As shown in FIG. 5, a chip carrier 1 in which a light emitting element 13 is mounted in a concave portion 12 is provided on an upper surface of a block 11.
A metal lens barrel 16 having a lens 15 for converging light emitted from the light emitting element 13 is provided on the upper surface of the block 11. In alignment between the light emitting element 13 and the lens 15,
After positioning the lens barrel 16 with respect to the light emitting element 13,
This is performed by fixing the lens barrel 16 using a wedge-shaped part 17.

In the case shown in FIG. 6, instead of using the wedge-shaped part 17 described above, a lens barrel 16 containing a lens 15 is replaced with a block 11 on which a chip carrier 14 having a light emitting element 12 is mounted. Is pressed against the end face to fix it.

[0006]

However, the prior art lens holding block shown in FIG.
After the relative position between the light emitting element 13 and the lens 15 is determined, the wedge-shaped part 17 is inserted and fixed. Therefore, even if the relative position is optimized, the relative position is determined by inserting the wedge-shaped part 17. The relationship is broken, and there is a problem in accuracy.

Further, in the prior art shown in FIG. 6, although the accuracy in a plane perpendicular to the optical axis is good, the distance between the lens 15 and the light emitting element 13 needs to rely on the microscope visual inspection or the machining accuracy. Problem.

The present invention has been made in view of the above problems, and has as its object to provide a light emitting module having a lens holding block capable of accurately fixing a relative position between a lens and a light emitting element.

[0009]

A light-emitting module according to the present invention that achieves the above object has a light-emitting element, a lens unit that focuses light emitted from the light-emitting element, and a light-emitting element opposite to the light-emitting element with the lens unit interposed therebetween. , And a metal lens holding block formed integrally with the light emitting element and the lens unit while holding the light emitting element and the lens unit. The lens portion and the lens holding block are fixed by welding at a plurality of welding portions.

Further, in the light emitting module according to the present invention,
The lens holding block holds a light emitting element and a lens unit that focuses light emitted from the light emitting element. Also,
The lens holding block is formed by integrally forming a metal block main body including a flat portion fixing the light emitting element and a vertical portion extending in a direction perpendicular to the flat portion and holding the lens portion. At the same time, the lens portion and the lens holding block are fixed by welding at a plurality of welding portions.

The structure of the lens holding block is a lens holding block for holding a light emitting element and a lens section for converging light emitted from the light emitting element, and a flat section for fixing the light emitting element, and a flat section for fixing the light emitting element. A block main body having a vertical portion extending in a direction perpendicular to the portion and holding the lens portion is integrally formed.

In the above arrangement, in order to determine the relative position between the lens and the light-emitting element in the lens barrel, after fixing the block body, the lens barrel including the lens is moved perpendicular to the optical axis and the optical axis. The lens barrel is moved and rotated about two axes, and the relative position is adjusted by adjusting the lens barrel while measuring the light emitted from the optical fiber located on the opposite side of the light emitting element with the lens interposed therebetween, for example.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a lens holding block applied to a light emitting module according to the present embodiment will be described below with reference to the drawings.

Embodiment 1 FIG. 1 is a perspective view of a lens holding block according to the present embodiment, and FIG. 2 is a sectional view thereof.

As shown in these drawings, the lens holding block has a block flat portion 22 formed on an upper surface of a block main body 21 and a chip carrier 14 having a light emitting element in a concave portion 12 in the block flat portion 22. It is installed.

A block vertical portion 23 extends upward from the block body 21 in a direction perpendicular to the block flat portion 22 on which the chip carrier 14 is mounted, and is integrated with the block flat portion 22. Is formed.

A lens cylinder 1 having a lens 15 is provided on the block vertical portion 23 so as to be coaxial with the optical axis of the light emitting element 13 provided on the chip carrier 14.
A through-hole 24 is formed as lens holding means for holding the lens tube 6, and fixes and holds the lens barrel 16. The diameter of the through hole 24 is larger than that of the lens barrel 16 so that the optical axis of the light emitting element 13 and the center axis of the lens 15 can be aligned, and the distance between them can be adjusted.

It is desirable that the block body 21 be made of a metal having high heat conductivity in order to efficiently transmit heat generated from the light emitting element 13.

A metal plate 25 having good weldability is provided on one side of the block vertical portion 23 other than the side where the chip carrier 14 is provided, so that welding with high fixing accuracy is possible. A through hole 24 for holding the lens barrel 16 is formed similarly to the block vertical portion 23.

In the above configuration, in order to determine the relative position between the lens 15 and the light emitting element 13, for example, after fixing the block body 21 in the transmission module,
The lens barrel 16 including the optical axis and the optical axis 2 orthogonal to the optical axis
While moving and rotating about an axis (an axis having the optical axis as a rotation axis if necessary), while monitoring the emitted light from the optical fiber 26 located on the opposite side of the light emitting element 13 with the lens 15 therebetween,
The relative position is adjusted with an accuracy of about 0.1 μm.

For this reason, it is possible to realize high positional accuracy without relying on mechanical processing accuracy, visual observation with a microscope, or the like.

In welding and fixing, since the welding portion of the through hole 24 for fixing the lens barrel is circularly symmetric with respect to the optical axis, simultaneous welding at a plurality of locations is possible.
It is possible to minimize the axial deviation at the time of welding as compared with the conventional case of fixing using a wedge-shaped part.

Second Embodiment FIG. 3 shows a lens holding block according to a second embodiment.

As shown in the figure, the lens holding block according to the present embodiment has a block flat portion 22 on the upper surface of the block body 21 and a flat portion 22 similar to the lens holding block 21 shown in FIG. The block vertical portion 23 is integrally formed in a direction perpendicular to the direction. In this embodiment, a notch 27 is formed in the block vertical portion 23 as lens holding means for holding the lens barrel 16.

Therefore, the lens barrel 16 having the lens 15
Since the approximate position can be confirmed with a microscope, the time required for lens alignment can be reduced.

Third Embodiment FIG. 4 shows a lens holding block according to a third embodiment of the present invention.

The block main body 21 according to this embodiment has the same structure as the block main body 21 shown in FIG. 1 and is made of an Fe--Ni--Cr alloy. There is no need to fix in advance the metal plate 25 for YAG welding provided on the back surface.

The lens holding block according to the present embodiment can be used when the amount of heat generated from the light emitting element 13 is small, or when the control temperature accuracy of the light emitting element may be low.

As described above with reference to the embodiments, the lens holding block according to the present embodiment holds a flat portion for fixing a member on which a photosensitive element or a light emitting element is mounted, and holds the lens portion perpendicular to the flat portion. Since the block main body including the block vertical portion is integrally formed, the relative position between the lens and the light emitting element can be fixed with high accuracy, and it is effective when applied to a transmission module used for optical communication or the like.

[0030]

As described above, a light emitting module having a lens holding block capable of accurately fixing the relative position between a lens and a light emitting element has been provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lens holding block according to a first embodiment.

FIG. 2 is a sectional view of FIG. 1;

FIG. 3 is a perspective view of a lens holding block according to a second embodiment.

FIG. 4 is a perspective view of a lens holding block according to a third embodiment.

FIG. 5 is a perspective view of a lens holding block according to the related art.

FIG. 6 is a perspective view of a lens holding block according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 13 ... Light-emitting element, 14 ... Chip carrier, 15 ... Lens, 16 ... Lens cylinder 21 ... Block main body, 22 ... Block flat part, 23 ... Block vertical part 24 ... Through hole, 25 ... Metal plate, 26 ... Optical fiber, 27
… Notch

Claims (4)

[Claims] A light-emitting element; a lens unit for converging light emitted from the light-emitting element; an optical fiber located opposite to the light-emitting element with the lens unit interposed; and the light-emitting element and the lens unit And a lens holding block that holds the light emitting element. The lens holding block includes a flat portion that fixes the light emitting element, and a vertical portion that extends in a direction orthogonal to the flat portion and holds the lens portion. A light emitting module, wherein a metal block main body is integrally formed, and the lens portion and the lens holding block are fixed by welding at a plurality of welding portions. 2. A light emitting device, a lens unit for converging light emitted from the light emitting device, an optical fiber positioned opposite to the light emitting device with the lens unit interposed therebetween, and the light emitting device and the lens unit And a metal lens holding block formed integrally with the light emitting module, wherein the lens portion and the lens holding block are fixed by welding at a plurality of welding portions. 3. The light-emitting module according to claim 1, wherein the lens portion and the lens holding block are fixed at a plurality of circularly symmetric locations. 4. The lens portion is fixed by welding via a metal plate having better weldability than the metal block.
Or the light emitting module according to claim 2.