TW201913173A - Prism - Google Patents

Abstract

Provided is a prism capable of sufficiently suppressing return light. The prism is provided with: an incident surface 2 which light enters; a reflecting surface 3 which reflects light having entered; and an outgoing surface 4 from which light outgoes. The prism is characterized in that the outgoing surface 4 is tilted with respect to the direction orthogonal to the incident surface 2.

Description

稜鏡

The present invention relates to a cockroach.

Previously, 元件 was used as an element for optically coupling optical elements. An example of such a crucible is disclosed in Patent Document 1 below. In Patent Document 1, the 稜鏡 is arranged such that the exit surface and the planar light element face each other. The fiber is bonded to the entrance face of the crucible. The light emitted from the optical fiber is received by the planar light element through the inside of the crucible. In order to condense the surface light element, a lens is provided on the exit surface of the ridge. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] International Publication No. 2013-099685

[The problem that the invention wants to solve]

A light is reflected by the light receiving surface of the surface type optical element. Therefore, in the optical module of Patent Document 1, there is a case where the reflected light is incident on the exit surface of the ridge again. The light incident on the pupil again exists in the case where the light is directed toward the planar light element and the light travels back along the path traveling in the crucible to reach the optical fiber. This kind of return light may affect the characteristics of the optical module.

It is an object of the present invention to provide a flaw that can sufficiently suppress return light. [Technical means to solve the problem]

The crucible of the present invention has an entrance surface for incident light, a reflective surface for reflecting incident light, and an exit surface for emitting light; the exit surface is inclined with respect to a direction orthogonal to the incident surface.

Preferably, the angle formed by the incident surface and the exit surface is an acute angle. More preferably, the angle of inclination of the exit surface with respect to the direction orthogonal to the incident surface is 5° or more and 15° or less.

Preferably, a lens is provided on the incident surface.

Further, the incident surface, the reflecting surface, and the emitting surface may be connected to the first side surface and the second side surface, and the lens may be provided in a plurality of rows in a direction in which the first side surface and the second side surface are connected.

Preferably, a support table having a bottom surface extending in a direction substantially orthogonal to the incident surface is provided on the exit surface side.

Preferably, a holding portion is provided on the opposite side of the exit surface. [Effects of the Invention]

According to the flaw of the present invention, the return light can be sufficiently suppressed.

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

(First Embodiment) Fig. 1 is a schematic perspective view showing a first embodiment of the present invention. Figure 2 is a schematic cross-sectional view of the 稜鏡 along the line I-I in Figure 1. As shown in Fig. 1, the crucible 1 has an incident surface 2 on which light is incident, a reflection surface 3 on which incident light is reflected, and an exit surface 4 on which light is emitted. As shown in FIG. 2, the light emitted from the light source 102 passes through the crucible 1, and is received by the light receiving element 103, for example.

Returning to Fig. 1, the crucible 1 further has a first side surface 5, a second side surface 6, and a facing surface 7. The first side surface 5 and the second side surface 6 are opposed to each other, and the incident surface 2, the reflecting surface 3, and the emitting surface 4 are connected. The opposing surface 7 is opposed to the incident surface 2, and the reflecting surface 3, the emitting surface 4, the first side surface 5, and the second side surface 6 are connected.

Furthermore, the crucible 1 may not have the opposing surface 7, and the reflecting surface 3 and the exit surface 4 may be directly connected. However, the crucible 1 preferably has a facing surface 7. Since the opposing surface 7 is provided in the direction in which the reflecting surface 3 and the emitting surface 4 are connected to each other, the 稜鏡1 can be pressed against a position adjusting jig (not shown) to adjust the position, and the optical axis can be more easily mounted during mounting. Adjustment.

A plurality of lenses 8 are provided on the incident surface 2. Each lens 8 is a convex lens. Specifically, the plurality of lenses 8 are arranged in a line along the direction in which the first side face 5 and the second side face 6 are joined. Thus, the first embodiment of the present embodiment is a 稜鏡 lens array. The light incident on the crucible 1 can be collected by the respective lenses 8. Furthermore, the number of the lenses 8 is not particularly limited. Moreover, it is not necessary to provide the lens 8.

Support tables 9A and 9B are provided on the exit surface 4 side. The support table 9A has a bottom surface 19A extending in a direction substantially orthogonal to the incident surface 2. Similarly, the support table 9B also has a bottom surface 19B extending in a direction substantially orthogonal to the incident surface 2. The crucible 1 is mounted, for example, to a light module having a light receiving element. At this time, the crucible 1 is attached to the optical module from the side of the bottom surfaces 19A and 19B of the support tables 9A and 9B.

The support tables 9A, 9B are integrally formed with the other portions of the crucible 1. In the present embodiment, the surface of the support table 9A is formed integrally with the incident surface 2, the first side surface 5, and the opposing surface 7. The surface of the support table 9B is formed integrally with the incident surface 2, the second side surface 6, and the opposing surface 7.

Furthermore, the configuration or shape of the support stations 9A, 9B is not limited to the above. For example, the support tables 9A and 9B may be formed on the inner side of the incident surface 2, the first side surface 5, the second side surface 6, and the opposite surface 7. Alternatively, a support stand having a shape such as a U-shape when viewed from the side of the exit surface 4 may be provided.稜鏡1 may also have no support stations 9A, 9B. In this case, for example, the first side face 5 or the second side face 6 is joined to another component of the optical module or the like.

Here, the mounting surface of the mounting crucible 1 is extended in the x direction and the y direction, and the direction perpendicular to the mounting surface is defined as the z direction. The incident surface 2 extends in the z direction and the y direction.

As shown in Fig. 2, the present embodiment is characterized in that the exit surface 4 is inclined with respect to a direction orthogonal to the incident surface 2. Thereby, the light L can be emitted from the exit surface 4 in a direction inclined with respect to the z direction. Therefore, as shown in FIG. 3, even if one of the light L is partially reflected by the light receiving surface of the light receiving element 103, the light L is reflected in a direction different from the direction of incidence to the light receiving surface. Therefore, the return light can be sufficiently suppressed. Thereby, it is possible to effectively suppress the influence of the return light on the optical characteristics and the like of the optical module on which the crucible 1 is mounted.

As shown in Fig. 2, the angle formed by the incident surface 2 and the exit surface 4 is preferably an acute angle. In this case, the light L can be emitted from the exit surface 4 in a direction away from the crucible 1. Therefore, it is possible to suppress the light reflected by the optical element 103 from being incident on the crucible 1 again.

The inclination angle θ1 of the exit surface 4 inclined with respect to the direction orthogonal to the incident surface 2 is preferably 3° or more, and more preferably 5° or more. If the inclination angle θ1 is too small, the return light may not be sufficiently suppressed. On the other hand, the inclination angle θ1 is preferably 17 or less, more preferably 15 or less. When the inclination angle θ1 is too large, the light L is emitted at a large angle with respect to the z direction. Therefore, it is necessary to increase the distance between the light receiving element 103 and the crucible 1, which may make it difficult to miniaturize the entire optical module.

The inclination angle θ2 of the reflection surface 3 inclined with respect to the direction orthogonal to the incident surface 2 is preferably 30° or more and 43° or less, more preferably 32° or more and 41° or less. In this case, the incident light is more easily reflected on the reflective surface 3. Therefore, even if the crucible 1 is made of a glass having a low refractive index, the incident light can be totally reflected, and the attenuation of the light reaching the light receiving element 103 can be effectively suppressed. In this way, the range of materials used in 稜鏡1 can be expanded.

On the other hand, the inclination angle θ2 of the reflecting surface 3 is preferably 47° or more and 60° or less, more preferably 49° or more and 57° or less. Thereby, the thickness of the crucible 1 in the x direction can be reduced, and the crucible 1 can be further miniaturized. Further, when the inclination angle θ2 is excessively large, light incident from the light source 102 may not be totally reflected on the reflection surface 3, but may be easily emitted from the reflection surface 3. Here, a reflective film may be provided on the reflecting surface 3. However, if the inclination angle θ2 is within the range in which the light incident from the light source 102 is not easily emitted from the reflection surface 3 as described above, the attenuation of the light reaching the light receiving element 103 can be effectively suppressed.

The lens 8 is preferably provided on the incident surface 2. Thereby, even if the light incident on the incident surface 2 is not collimated light, the light can be concentrated when incident on the crucible 1, so that the optical effective surface on the reflecting surface 3 and the exit surface 4 can be restricted, and the shape of the part can be improved. The degree of freedom, improve the yield of production. Furthermore, the lens 8 may be provided on both the incident surface 2 and the exit surface 4, or may be provided only on the exit surface 4.

As shown in the present embodiment shown in Fig. 1, the crucible 1 preferably has support tables 9A and 9B. In this case, when mounted on the optical module, 稜鏡1 may be placed on the bottom surfaces 19A and 19B of the support tables 9A and 9B. Therefore, it is easy to install 稜鏡1. Here, the more the number of parts for mounting, the more elements are generated in which 稜鏡1 is displaced. In the present embodiment, since the support tables 9A and 9B are integrally formed with the other portions, the number of components for mounting the crucible 1 can be reduced, so that the positional accuracy when the crucible 1 is mounted can be improved.

Fig. 4 is a schematic perspective view showing a modification of the first embodiment. The crucible 21 of the present modification has a face 25 that connects the incident surface 2 and the reflecting surface 3. In this manner, the incident surface 2, the reflecting surface 3, the emitting surface 4, the first side surface 5, the second side surface 6, and the surface other than the opposing surface 7 may be provided.

(Second Embodiment) Fig. 5 is a schematic perspective view showing a second embodiment of the present invention. In the present embodiment, the holding portion 36 is provided on the opposite side of the exit surface 4, which is different from the first embodiment. The holding portion 36 extends in the z direction in which the incident surface 2 extends.

The surface of the holding portion 36 is provided integrally with the incident surface 2, the first side surface 5, and the second side surface 6. Further, the holding portion 36 may be provided inside the incident surface 2, the first side surface 5, and the second side surface 6.

Fig. 6 is a view schematically showing the example in which the crucible is held in the second embodiment from the first side surface side. Fig. 7 is a view schematically showing the example in which the crucible is held in the second embodiment from the side of the incident surface.

As shown in FIGS. 6 and 7, the holding portion 36 of the crucible 31 is held by the arm 104. As shown in FIG. 7, in the present embodiment, the holding portion 36 is provided to connect the first side face 5 and the second side face 6. The length of the holding portion 36 in the y direction is the same as the entire length of the crucible 31 in the y direction, so that the area of the portion where the arm 104 holds the crucible 31 can be increased. Therefore, the crucible 31 can be more reliably held, so that the crucible 31 can be easily mounted, and the positional accuracy at the time of mounting can be improved. Further, since the force of the arm 104 holding the crucible 31 is hard to concentrate on the narrow area, the crucible 31 is less likely to be cracked or defective.

In the present embodiment, the exit surface 4 is also inclined with respect to the direction orthogonal to the incident surface 2. Therefore, the light can be emitted from the exit surface 4 in a direction inclined with respect to the z direction, and the return light can be sufficiently suppressed.

(Third embodiment) Fig. 8 is a schematic perspective view showing a third embodiment of the present invention. In the present embodiment, the projections 47A and 47B are provided on the incident surface 2, which is different from the second embodiment.

The protrusions 47A, 47B extend in the z direction. The projection 47A comes from the incident surface 2 to the vicinity of the support table 9A. The protruding portion 47B reaches the vicinity of the support table 9B from the incident surface 2. The protrusions 47A, 47B do not reach the holding portion 36. The cross-sectional shape of the projections 47A and 47B on the plane orthogonal to the incident surface 2 and extending in the x direction and the y direction is not particularly limited, and is triangular in the present embodiment. Further, the cross-sectional shape of the protrusions 47A and 47B described above may be, for example, a substantially rectangular shape or a substantially semicircular shape.

When the crucible 41 is mounted, alignment is easily performed based on the projections 47A and 47B. Therefore, the positional accuracy of the mounting of the crucible 41 can be effectively improved. Further, since the projections 47A and 47B do not reach the holding portion 36, similarly to the second embodiment, when the arm is held by the crucible 41, physical interference with the projection 47A or the projection 47B can be avoided, and stability can be sufficiently ensured. The area of the part that is held by the ground.

In the present embodiment, the exit surface 4 is also inclined with respect to the direction orthogonal to the incident surface 2. Therefore, the light can be emitted from the exit surface 4 in a direction inclined with respect to the z direction, and the return light can be sufficiently suppressed.

Fig. 9 is a schematic perspective view showing a modification of the third embodiment. In the present modification, the protruding portions 57A and 57B reach the holding portion 36. In this case, when the arm is held by the cymbal 51, the protrusion 57A and the protrusion 57B of the holding portion 36 may be held by an arm or the like. The positions of the protrusions 57A and 57B are not particularly limited, and may be provided only on the support tables 9A and 9B, for example. Alternatively, for example, two protrusions may be provided on the holding portion 36, and the other two protrusions may be provided on the support tables 9A and 9B. The number of protrusions may be only one.

1‧‧‧稜鏡

2‧‧‧Incoming surface

3‧‧‧reflecting surface

4‧‧‧Outlet

5, 6‧‧‧ first and second sides

7‧‧‧ opposite

8‧‧‧ lens

9A, 9B‧‧‧ support desk

19A, 19B‧‧‧ bottom

21‧‧‧稜鏡

25‧‧‧ Face

31‧‧‧稜鏡

36‧‧‧ Holding Department

41‧‧‧稜鏡

47A, 47B‧‧‧ protrusions

51‧‧‧稜鏡

57A, 57B‧‧‧ protrusion

102‧‧‧Light source

103‧‧‧Light-receiving components

104‧‧‧ Arm

L‧‧‧Light

x, y, z‧‧ direction

Θ1, θ2‧‧‧ tilt angle

Fig. 1 is a schematic perspective view showing a first embodiment of the present invention. Figure 2 is a schematic cross-sectional view of the 稜鏡 along the line I-I in Figure 1. Fig. 3 is a view schematically showing an example in which light emitted from the pupil is reflected on the light receiving element in the first embodiment of the present invention. Fig. 4 is a schematic perspective view showing a modification of the first embodiment of the present invention. Fig. 5 is a schematic perspective view showing a second embodiment of the present invention. Fig. 6 is a view schematically showing the example in which the crucible is held in the second embodiment of the present invention from the first side surface side. Fig. 7 is a view schematically showing the example in which the crucible is held in the second embodiment of the present invention, from the side of the incident surface. Fig. 8 is a perspective view showing a mode of a third embodiment of the present invention. Fig. 9 is a schematic perspective view showing a modification of the third embodiment of the present invention.

Claims (7)

A crucible having: an incident surface for incident light; a reflecting surface for reflecting incident light; and an exit surface for emitting light; wherein the exit surface is inclined with respect to a direction orthogonal to the incident surface. In the case of claim 1, the angle formed by the incident surface and the exit surface is an acute angle. In the second aspect of the invention, the angle of inclination of the exit surface with respect to the direction orthogonal to the incident surface is 5° or more and 15° or less. The item of any one of claims 1 to 3, wherein the incident surface is provided with a lens. Further, in the fourth aspect of the invention, the incident surface, the reflecting surface, and the emitting surface are connected to the first side surface and the second side surface, wherein the lens is coupled to the first side surface and the second surface A plurality of the sides are arranged in a row. In any one of claims 1 to 3, a support table having a bottom surface extending in a direction substantially orthogonal to the incident surface is provided on the exit surface side. The enthalpy of any one of claims 1 to 3, wherein a retaining portion is provided on the opposite side of the exit surface.