TW201913154A - 稜鏡 and light module - Google Patents

Abstract

Provided is a prism whereby alignment can be easily performed, and size reduction can be achieved. A prism 1 is characterized by being provided with: an incident surface 2 which light enters; a reflecting surface 3 on which light having entered the incident surface 2 is reflected; and an outgoing surface 4 from which light having been reflected by the reflecting surface 3 outgoes. The prism is also characterized in that: the reflecting surface 3 is provided with a convex lens 8; and the convex lens 8 is an asymmetric lens.

Description

稜鏡 and light module

The present invention relates to an optical module that optically couples optical elements and an optical module having the same.

Previously, it has been known to use optical modules that have optical coupling between optical components. An example of such an optical module is disclosed in Patent Document 1 below. In the optical module of Patent Document 1, 稜鏡 is provided at one end of the optical waveguide circuit. The light emitted from the optical waveguide circuit is received by the light receiving element through the inside of the crucible. In Patent Document 1, a lens is provided on the exit surface of the crucible, thereby concentrating on the light receiving element.

Further, Patent Document 2 listed below discloses an optical module including a lens that is provided on both the incident surface and the exit surface. In Patent Document 2, alignment marks are provided for each of the pupil and the light receiving element. Further, the position of the alignment mark is detected by the imaging device, and the alignment marks of the pupil and the light-receiving element are superimposed, thereby completing alignment. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2010-164856 (Patent Document 2) Japanese Patent Laid-Open No. Hei No. 2014-137410

[The problem that the invention wants to solve]

However, in the optical module of Patent Document 1, since the lens curved surface cannot be visually recognized from the side of the light receiving element, there is a problem that alignment (position alignment) by the lens cannot be performed at the time of mounting. Further, in the optical module of Patent Document 2, there is a case where the positional accuracy error between the lens and the alignment mark accumulates. Further, since it is necessary to add an alignment mark to the structure, there is a problem that cost reduction or miniaturization is difficult.

It is an object of the present invention to provide a crucible that can be easily aligned and that can be miniaturized and an optical module that uses the crucible. [Technical means to solve the problem]

A feature of the present invention is characterized in that: an incident surface for incident light; a reflecting surface for reflecting light incident through the incident surface; and an emitting surface for emitting light reflected by the reflecting surface; The surface is provided with a convex lens, and the convex lens is an asymmetrical lens.

Preferably, in the reflection surface, when the arbitrary direction is the x direction and the direction orthogonal to the x direction is the y direction, the curvature of the convex lens in the x direction is the same as the above The curvature of the above convex lens in the y direction is different.

Preferably, in the present invention, light is totally reflected on the reflecting surface.

Preferably, the first side surface and the second side surface are opposite to each other, and the first side surface and the second side surface are connected to the incident surface, the reflecting surface, and the emitting surface, respectively In the direction of the one side surface and the second side surface, the plurality of convex lenses are provided in one row.

In the above-described reflecting surface, when the direction connecting the first side surface and the second side surface is the x direction and the direction orthogonal to the x direction is the y direction, The curvature of the convex lens in the x direction is larger than the curvature of the convex lens in the y direction.

An optical module according to the present invention includes: a light-emitting element configured to illuminate light emitted from the pupil, and a light-receiving element configured to condense light emitted from the pupil. [Effects of the Invention]

According to the present invention, it is possible to provide an easiness that can be easily aligned and can be miniaturized.

Hereinafter, preferred embodiments will be described. However, the following embodiments are merely illustrative, and the present invention is not limited to the embodiments. In the drawings, members having substantially the same functions may be referred to by the same reference numerals.

(First Embodiment) Fig. 1 is a perspective view showing the appearance of a light module constituting the optical module according to the first embodiment of the present invention. Fig. 2 is a schematic cross-sectional view showing a main part of an optical module according to a first embodiment of the present invention. 2 is a schematic cross-sectional view showing a principal part of the optical module in the direction along the line A-A of FIG. 1.

As shown in FIG. 2, the optical module 11 includes an optical fiber 12, a crucible 1, and a light receiving element 13. The crucible 1 includes an incident surface 2, a reflecting surface 3, an emitting surface 4, and a facing surface 7. The incident surface 2 is a surface on which light is incident. The reflecting surface 3 is a surface on which light incident from the incident surface 2 is reflected. Further, the exit surface 4 is a surface on which the light reflected by the reflecting surface 3 is emitted. The opposing surface 7 is opposed to the incident surface 2, and is connected to the reflecting surface 3 and the emitting surface 4.

In the present embodiment, light is emitted from the optical fiber 12, and light enters the crucible 1 through the incident surface 2. Light incident into the crucible 1 through the incident surface 2 is reflected by the reflecting surface 3. The light reflected by the reflecting surface 3 passes through the exit surface 4 and is emitted outside the crucible 1. Then, the light emitted from the exit surface 4 is received by the light receiving element 13.

As shown in FIG. 1, the crucible 1 has a first side surface 5 and a second side surface 6 facing each other. The incident surface 2, the reflecting surface 3, the emitting surface 4, and the opposing surface 7 are coupled to the first side surface 5 and the second side surface 6. More specifically, the incident surface 2 is connected to the reflecting surface 3 and the emitting surface 4, and the first side surface 5 and the second side surface 6 are connected. The reflecting surface 3 is connected to the incident surface 2 and the opposing surface 7, and connects the first side surface 5 and the second side surface 6. The exit surface 4 is connected to the incident surface 2 and the opposing surface 7, and connects the first side surface 5 and the second side surface 6. Further, the opposing surface 7 is connected to the reflecting surface 3 and the emitting surface 4, and the first side surface 5 and the second side surface 6 are coupled to each other.

A plurality of convex lenses 8 are provided on the reflecting surface 3. In the present embodiment, the planar shape of the plurality of convex lenses 8 is elliptical. Of course, the planar shape of the plurality of convex lenses 8 may not be elliptical, and the planar shape is not particularly limited.

Further, a plurality of convex lenses 8 are provided in a row in the direction in which the first side face 5 and the second side face 6 are connected to each other in the reflecting surface 3. Thereby, a 稜鏡 lens array is constructed. Therefore, the first embodiment of the present embodiment is a 稜鏡 lens array. Further, in the crucible 1, the number of the convex lenses 8 is not particularly limited. The crucible 1 may be, for example, a crucible composed of one convex lens 8. In the present embodiment, the light incident on the crucible 1 can be reflected by the convex lens 8, and the light can be collected by the light receiving element 13.

Fig. 3 is a schematic plan view showing a reflecting surface of a crucible constituting the optical module according to the first embodiment of the present invention. As shown in FIG. 3, a plurality of convex lenses 8 are asymmetrical lenses having a so-called astigmatism aspherical surface. More specifically, the curvature of the convex lens 8 in the x ₁ direction shown in FIG. 3 is different from the curvature of the convex lens 8 in the y ₁ direction. Further, in the present embodiment, the direction in which the first side face 5 and the second side face 6 are connected to the reflection surface 3 in the x ₁ direction is obtained. The y ₁ direction is a direction orthogonal to the x ₁ direction in the reflecting surface 3. Of course, in the present invention, the curvature of the convex lens 8 in any direction of the reflecting surface 3 may be different from the curvature of the convex lens 8 in the direction orthogonal to any of the above-described directions. Further, in the present embodiment, the plurality of convex lenses 8 are each constituted by an asymmetrical lens, but at least one of the plurality of convex lenses 8 may be constituted by an asymmetrical lens.

In the present embodiment, as described above, the convex lens 8 is provided on the reflecting surface 3 of the crucible 1. Therefore, the position of the lens 8 can be clearly visually recognized from the direction other than the light receiving element 13. Therefore, when the crucible 1 is mounted, alignment can be easily and accurately performed, and the positional accuracy when the crucible 1 is mounted can be effectively improved. Further, in the present embodiment, since the position of the convex lens 8 can be clearly visually recognized, it is not necessary to add an alignment mark to the emission surface 4 equal to the structure. Therefore, in the crucible 1 or the optical module 11, the number of parts can be reduced.

In the present embodiment, the optical fiber 12 is directly connected to the incident surface 2 of the crucible 1. In the present embodiment, the convex lens 8 is provided on the reflecting surface 3 of the crucible 1, and the convex lens 8 is not provided on the incident surface 2, so that the optical fiber 12 can be brought close to the incident surface 2. Therefore, the miniaturization of the optical module 11 can be achieved.

In the present embodiment, the convex lens 8 is provided on the reflecting surface 3 of the crucible 1, and the convex lens 8 is not provided on the emitting surface 4, so that the height of the optical module 11 can be reduced.

Further, in the present embodiment, as described above, the alignment mark can be added to the emission surface 4 equal to the structure. Therefore, in this respect, the optical module 11 can be reduced in size or height.

Further, in the present embodiment, as described above, the convex lens 8 is constituted by an asymmetrical lens. Therefore, in the optical module 11, light can be condensed on the light receiving element 13 with high precision. This will be described in more detail below with reference to FIGS. 4 and 7.

Fig. 4 is a schematic view showing a state in which light is received by a light receiving element constituting the optical module according to the first embodiment of the present invention. Fig. 7 is a schematic view showing a state in which light is received by a light receiving element constituting an optical module of a comparative example. In addition, in the case of using the axially asymmetric convex lens 8 of the above-described embodiment, the state in which the light is received by the light receiving element 13 is shown in FIG. In addition, FIG. 7 shows a state in which light is received by the light receiving element 13 when a convex lens which is an axisymmetric as a comparative example is used.

In the comparative example, since the axisymmetric convex lens is used, the light reflection direction cannot be independently controlled in the x ₂ direction and the y ₂ direction. Therefore, as shown in FIG. 7, the light receiving element 13 cannot be condensed with high precision.

On the other hand, in the present embodiment, since the axially asymmetric convex lens 8 is used, the light reflection direction can be independently controlled in the x ₂ direction and the y ₂ direction. Therefore, as shown in FIG. 4, the light receiving element 13 can be condensed with high precision.

Further, as shown in Figure 3, the present embodiment, the convex curvature of the 8 x ₁ direction is larger than the curvature of the convex lens 8 in the _direction of y. Thus, the same size on the reflecting surface of the case ₁ x 3 direction, the convex lens 8 are compared to the case of a spherical, convex lens 8 can be disposed of more. Further, when the same number of the convex lens 8 of the case, the size can be further reduced on the reflecting surface of the x 3 _direction, so that it can achieve further downsizing.

Further, in the present embodiment, it is preferable that the light is totally reflected on the reflecting surface 3. In this case, light can be more efficiently concentrated on the light receiving element 13.

Further, in the present embodiment, the convex lens 8 is preferably made of glass. In this case, higher optical characteristics can be obtained, so that higher durability can be obtained.

As the glass, for example, SiO ₂ -B ₂ O ₃ -RO (R is Mg, Ca, Sr or Ba)-based glass, SiO ₂ -B ₂ O ₃ -R' ₂ O (R' is Li, Na or K) glass, SiO ₂ -B ₂ O ₃ -RO-R' ₂ O (R' is Li, Na or K) glass, SnO-P ₂ O ₅ glass, TeO ₂ glass or Bi ₂ O ₃ Glass, etc.

(Second Embodiment) Fig. 5 is a schematic cross-sectional view showing an optical module according to a second embodiment of the present invention. As shown in FIG. 5, the opposing surface 7 may not be provided in the crucible 22 constituting the optical module 21. In the crucible 22, the reflecting surface 3 and the exit surface 4 are directly connected. In addition, the planar shape of the crucible 22 is substantially triangular. Other points are the same as in the first embodiment.

In the second embodiment, the convex lens 8 is also provided on the reflecting surface 3, and the convex lens 8 is also an asymmetrical lens. Therefore, when the crucible 22 is mounted, alignment can be performed easily and with high precision. Further, since the position of the convex lens 8 can be clearly visually recognized, it is not necessary to add an alignment mark to the emission surface 4 equal to the structure. Therefore, in the crucible 22 or the optical module 21, the number of parts can be reduced. Moreover, the size and height of the optical module 21 can be reduced.

Further, as in the second embodiment, the crucible 22 may directly connect the reflecting surface 3 and the emitting surface 4 without the opposing surface 7. In this case, further lowering of the crucible 22 or the optical module 21 can be achieved. Of course, in the case of having the opposing surface 7 as in the first embodiment, by having the opposing surface 7 along the direction in which the reflecting surface 3 and the emitting surface 4 are connected, the 稜鏡1 can be pressed against the unillustrated The position adjustment of the jig for position adjustment is shown, and the optical axis adjustment at the time of mounting can be performed more easily.

(Third Embodiment) Fig. 6 is a schematic cross-sectional view showing an optical module according to a third embodiment of the present invention. As shown in FIG. 6, in the optical module 31, the exit surface 4 of the crucible 32 is connected to the light receiving element 13. Other points are the same as in the first embodiment.

In the third embodiment, the convex lens 8 is also provided on the reflecting surface 3, and the convex lens 8 is also an asymmetrical convex lens 8. Therefore, when the crucible 32 is mounted, it can be easily and accurately aligned. Further, since the position of the convex lens 8 can be clearly visually recognized, it is not necessary to add an alignment mark to the emission surface 4 equal to the structure. Therefore, in the crucible 32 or the optical module 31, the number of parts can be reduced. Further, it is also possible to reduce the size or height of the optical module 31.

Further, as in the third embodiment, the exit surface 4 of the crucible 32 may be directly connected to the light receiving element 13. In this case, further lowering of the optical module 31 can be achieved.

1‧‧‧稜鏡

2‧‧‧Incoming surface

3‧‧‧reflecting surface

4‧‧‧Outlet

5‧‧‧1st side

6‧‧‧2nd side

7‧‧‧ opposite

8‧‧‧ convex lens

11‧‧‧Light Module

12‧‧‧ fiber

13‧‧‧Light-receiving components

21‧‧‧Light Module

22‧‧‧稜鏡

31‧‧‧Light Module

32‧‧‧稜鏡

x ₁ ‧‧‧ directions

x ₂ ‧‧‧ directions

y ₁ ‧‧‧ directions

y ₂ ‧‧‧ directions

Fig. 1 is a perspective view showing the appearance of a light module constituting the optical module according to the first embodiment of the present invention. Fig. 2 is a schematic cross-sectional view showing a main part of an optical module according to a first embodiment of the present invention. Fig. 3 is a schematic plan view showing a reflecting surface of a crucible constituting the optical module according to the first embodiment of the present invention. Fig. 4 is a schematic view showing a state in which light is received by a light receiving element constituting the optical module according to the first embodiment of the present invention. Fig. 5 is a schematic cross-sectional view showing a main part of an optical module according to a second embodiment of the present invention. Fig. 6 is a schematic cross-sectional view showing a main part of an optical module according to a third embodiment of the present invention. Fig. 7 is a schematic view showing a state in which light is received by a light receiving element constituting an optical module of a comparative example.

Claims (6)

a crucible having: an incident surface for incident light; a reflective surface for reflecting light incident through the incident surface; and an exit surface for emitting light reflected by the reflective surface; wherein the reflective surface is provided with A convex lens, wherein the convex lens is an asymmetrical lens. According to claim 1, wherein the curvature of the convex lens in the x direction is the same as the direction of the x direction when the arbitrary direction is the x direction and the direction orthogonal to the x direction is the y direction. The curvature of the above convex lens in the y direction is different. As claimed in claim 1 or 2, wherein the light is totally reflected on the reflecting surface. Further, in the first or second aspect, the first side surface and the second side surface are opposite to each other, and the first side surface and the second side surface are connected to the incident surface, the reflecting surface, and the emitting surface, respectively. In the direction of the first side surface and the second side surface, the plurality of convex lenses are provided in a row. In the first or second aspect of the invention, in the reflection surface, a direction connecting the first side surface and the second side surface is the x direction, and a direction orthogonal to the x direction is the y direction. The curvature of the convex lens in the x direction is greater than the curvature of the convex lens in the y direction. An optical module comprising: the enthalpy of any one of claims 1 to 5; an optical fiber for causing light to enter the cymbal; and a light receiving element for illuminating the light from the cymbal Spotlight.