JPH0525408U - Luminescent module - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a low-cost light emitting module used as a light source for optical communication. [Structure] Aspherical plastic lens 1 integrally molded
0 and the ferrule 3 whose end face is treated with the optical fiber 5 is fixed to the holder 2 and is composed of the light emitting element 1 in which the light emitting pellet is incorporated. [Effect] The aspherical plastic lens 10 has a performance equal to or higher than that of a conventional glass lens, is easy to mold, and uses a plastic material that can be mass-produced. Is.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a light emitting module used as a light source for optical communication.

[0002]

[Prior Art]

 An example of a conventional light emitting module used as a light source for optical communication is shown in FIG. In FIG. 3, a small-diameter through hole 12b and a large-diameter recess 12a are provided in the shaft center of a holder 12 made of a metal (for example, a copper material) having a substantially U-shaped cross section. Of these, the ferrule 3 having the right end portion of the optical fiber 5 inserted therein is inserted into the through hole 12b from the left side in FIG.

In the recess 12 a, a substantially convex light emitting element 4 having a light emitting pellet 4 a housed at the left end axis is inserted from the right side with the left end abutting the right end of the ferrule 3, and the light emitting element 4 The solder 8 is fixed between the right end of the insertion portion and the right end of the holder 12. The light emitting element 4 is connected to a power source 9 not shown in detail. On the other hand, a power meter b is connected to the left end of the optical fiber 5 via an optical fiber connector 7.

In the light emitting module 21 thus configured, the light emitting pellet 4a of the light emitting element 4 emits light by the power supplied from the power source 9, and this light is transmitted from the ferrule 3 to the power meter 6 via the optical fiber 5. Is transmitted. Then, by finely adjusting the light emitting element 4 in the X and Y directions orthogonal to the axis of the holder 12 and in the directions parallel to the axis, the position where the light incident on the power meter 6 becomes maximum is determined. Then, the light emitting element 4 is fixed to the holder 12 with the solder 8.

Next, FIG. 4 shows an example of a conventional light emitting module different from that of FIG. In FIG. 4, a glass lens 13 having a spherical right end from the middle portion to the right side is inserted into a small-diameter through hole 22b penetrating the axis of the holder 22 of the light emitting module 31. A recess 22a is formed on the right end surface of the holder 22, and the light emitting element 4 is inserted into the recess 22a from the right side as in FIG. 1 and fixed to the holder 22 with solder 8. Similar to FIG. 1, the light emitting element 4 is connected to the power source 9, the ferrule 3 is inserted into the through hole 22b of the holder 22, and the ferrule 3 is provided with the optical fiber 5, the optical fiber connector 7, and the power meter 6. Are connected in sequence.

Also in this case, as in the case of 1, the light emitting element 4 is adjusted, and when the amount of light received by the power meter 6 exceeds a predetermined value, it is fixed to the holder 12 with the solder 8.

[0007]

[Problems to be solved by the device]

 However, among them, in the light emitting module 21 shown in FIG. 3, it takes time to move the light emitting element 4 to adjust the position of the light emitting pellet 4a and the optical fiber 5 inside the ferrule 3 as well as the optical axis. When the light emitting element 1 is fixed to the holder 12 with the solder 8 in the process, the adjusted optical axis may be slightly deviated. Further, since the holder 12 is manufactured by cutting, not only it takes time to manufacture but also the cost becomes high.

On the other hand, in the light emitting module 31 shown in FIG. 4, since the light-incident surface at the right end of the glass lens 13 is processed into a spherical surface, it takes time to manufacture and the cost becomes high.

Therefore, an object of the first invention is to obtain a light emitting module whose optical axis can be easily adjusted and whose cost is low, and an object of the second invention is to provide a light emitting module which is easy to manufacture. Is to get.

[0010]

[Means and Actions for Solving the Invention]

 A first invention is a light emitting module in which a ferrule having an end of an optical fiber inserted is attached to one side of an axis of a holder, and a light emitting element is attached to the other side of the axis of the holder. By molding the holder with thermoplastic resin and pressing and fixing the light emitting element on the other side of the axis of the holder, the holder can be easily manufactured and the light emitting element can be fixed easily, and the optical axis adjustment is easy and the price is low. It is a light emitting module that can be lowered.

According to a second aspect of the invention, a ferrule in which an end of an optical fiber is inserted is inserted and attached to one side of an axis of a holder, and a light emitting element is attached to the other side of an axis of the holder, In a light-emitting module in which a condenser lens is inserted in the center of the axis, by using a convex lens made of plastics with curved surfaces on both sides, the condenser lens can be easily manufactured and manufactured. It is a light emitting module.

[0012]

【Example】

 An embodiment of the first invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a light emitting module 1 of the first invention.

In FIG. 1, the holder 2 of the light emitting module 1 of the first invention has substantially the same shape as the holder 12 shown in FIG. 3 of the related art, but the material is molded from thermoplastic plastics to emit light. The hole 4a into which the element 4 is fitted from the right side is made to have substantially the same size as the light emitting element 4.

In the light emitting module 1 configured as above, the ferrule 3 and the light emitting element 4 can be assembled by press-fitting from the left and right of the holder 2, respectively. Further, when the optical axis is adjusted, the holder 1 is heated and slightly softened and expanded to move the light emitting element 4 slightly in the X and Y directions orthogonal to the optical axis and in the optical axis direction as in the conventional case. When the value measured by the power meter 6 exceeds a predetermined value, heating is stopped and the light emitting element 4 is fixed by softening and shrinking.

Therefore, in the light emitting module 1 configured as described above, the holder 2 can be manufactured in a large amount in a short time by using a molding die, and soldering does not require any work. Therefore, the optical axis adjustment is easy and the price is low. It can be a light emitting module that can be lowered.

Next, an embodiment of the second invention will be described with reference to FIG. In FIG. 2, the holder 12 of the light emitting module 11 is provided with a cylindrical hole 12b having the same diameter as the conventional one on the left side, and a slightly larger hole 12c is provided on the right side of the hole 12b. A large-diameter hole 12d is provided, and a hole 12a having the same size as the conventional hole 22a shown in FIG. 4 is provided on the right side.

A convex plastic lens 10 made of transparent plastics is inserted into the hole 12d, and the light emitting element 4 is fixed to the hole 12a with solder 8 as in FIG. In the light emitting module 11 configured as described above, the light radially emitted to the left by the light emitting pellet 4a is bent at the curved surface on the right side of the lens 10, goes straight to the curved surface on the left side, and is further bent to make ferrule 3 Is incident on the optical fiber 5 inside.

Therefore, in the light emitting module 11 configured as above, the lens 10 can be manufactured in a large amount in a short time by using a molding die, so that the light emitting module 11 that is easy to manufacture and inexpensive can be obtained. The holder 12 shown in FIG. 2 may be made of a thermoplastic resin as in the case of FIG. 1 to facilitate manufacturing, and the light emitting element 4 may be fixed by pressing in the same manner as in FIG.

[0019]

[Effect of the device]

 As described above, according to the first aspect of the invention, the ferrule in which the end portion of the optical fiber is inserted is attached to one side of the axis of the holder, and the light emitting element is attached to the other side of the axis of the holder. In the Joule, the holder is molded with thermoplastic resin, and the light emitting element is press-fitted and fixed to the other side of the holder's shaft center, eliminating the need for cutting the holder and soldering the light emitting element. It is possible to obtain a light emitting module which is easy to manufacture and can be reduced in price.

According to the second invention, the ferrule in which the end of the optical fiber is inserted is inserted into one side of the shaft center of the holder, and the light emitting element is inserted into the other side of the shaft center of the holder. , In a light emitting module in which a condenser lens is inserted in the center of the axis of the holder, the condenser lens is made of a plastic convex lens with curved surfaces on both sides, which facilitates the production of the condenser lens. A light emitting module that is easy to manufacture can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a light emitting module of the first invention.

FIG. 2 is a sectional view showing an embodiment of a light emitting module of the second invention.

FIG. 3 is a sectional view showing an example of a conventional light emitting module.

FIG. 4 is a sectional view showing an example of a conventional light emitting module different from that of FIG.

[Explanation of symbols]

 1, 11, 21, 31 Light emitting module 2, 12, 22, 32 Holder 3 Ferrule 4 Light emitting element 5 Optical fiber 6 Power meter 7 Optical fiber connecting tool 8 Solder 9 Power supply

Claims (2)

[Scope of utility model registration request] 1. A light emitting module in which a ferrule in which an end of an optical fiber is inserted is inserted into one side of an axis of a holder and a light emitting element is inserted into the other side of the axis of the holder. A light emitting module formed by molding with a thermoplastic resin, wherein the light emitting element is press-fitted and fixed to the other side of the axis of the holder. 2. A ferrule in which an end of an optical fiber is inserted is attached to one side of an axis of a holder, a light emitting element is attached to the other side of the axis of the holder, and the center of the axis of the holder is attached. In the light emitting module with the condenser lens attached to the part,
A light emitting module, wherein the condensing lens is a convex lens made of plastics and having curved surfaces on both sides.