JP5289367B2 - Optical package - Google Patents

Description

  The present invention relates to an optical package in which a condensing lens is attached to and integrated with an optical package containing an optical element, and a bonding method for integration.

  When a lens is attached to an optical package that houses an optical element, it is necessary to match the optical axis of the optical element with the optical axis of the lens. Thus, for example, in the method for manufacturing an optical package disclosed in Patent Document 1, an assembly step for positioning is provided on the outer periphery of the optical package containing the optical element, and the optical axis is aligned by attaching a lens there. It was.

  On the other hand, as a method of aligning the optical axis of the optical element and the optical axis of the lens, there is a conventional method of imaging the optical element and the lens with a camera and aligning the outer center of the optical element with the outer center of the lens. This alignment method is shown in FIG. In the figure, an optical package 1 is formed by fixing an optical element 3 and a substrate 6 with a mold part 2 and sealing with a translucent resin from above. When the lens 10 is attached to the joint surface 5 of the optical package 1, the alignment device 20 images the optical package 1 and the lens 10 from the front with the camera 21, and the outer shape of the optical element 3 and the outer shape of the lens 10 are taken from the captured image. Recognizing, the external center X3 of the optical element 3 and the external center X10 of the lens 10 are obtained and aligned.

JP 2006-339653 A

  In the manufacturing method according to Patent Document 1, there is a problem that the size of the optical package itself is increased by the thickness of the side surface of the lens, and a large installation area is required on the circuit board on which the optical package is mounted. It is not preferable.

On the other hand, the alignment method shown in FIG. 7 has a problem that an image captured by the camera is affected by refraction by the lens, and adjustment for eliminating this influence becomes difficult.
The lens attached to the optical package has a structure in which one side is flat like the lens 10 in FIG. 7 and the other side is curved, and a lens part 31 and a prism part 32 are integrally formed as shown in FIG. In some cases, the prism lens 30 may have a different configuration. In the case of the prism lens 30, the outer shape of the optical element 3 and the outer shape of the lens unit 31 cannot be recognized at the same time as shown in the captured image of the camera 21 displayed on the monitor screen 22 of FIG. For this reason, it is necessary to separately install the camera 23 in the front direction of the lens unit 31 to recognize the outer shape of the lens unit 31 and obtain the outer center X31. However, the alignment device 20 becomes complicated and expensive. End up. Also, the alignment procedure becomes more complicated.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an optical package capable of easily and accurately aligning the optical axis of a lens and an optical element, and a method for joining the optical package and the lens. And

An optical package according to claim 1 of the present invention includes an optical package containing an optical element,
A converging lens provided on the joint surface of the optical package and the lens for aligning the optical element and the optical axis of the lens, and a condensing lens that is joined to and integrated with the optical package. The positioning concave portion is provided on the joint surface of the optical package, the outer center is aligned with the optical axis of the optical element, and the positioning convex portion is provided on the joint surface of the lens, and The outer shape center is aligned with the optical axis of the lens .

According to a second aspect of the present invention, the positioning convex portion is an optical filter.

In the optical package according to claim 3 of the present invention, the lens includes a curved surface for condensing, a joint surface joined to the optical package, and a refracting portion that bends the light flux passing between the curved surface and the joint surface to an arbitrary angle. It is made to have.

According to the first and second aspects of the present invention, the positioning concave and convex portions for aligning the optical axes of the optical element and the lens are provided on the joint surface between the optical package and the lens. An optical package capable of easily and accurately aligning the optical axis can be provided by fitting the concave and convex portions for positioning when the lenses are joined.

According to the third aspect of the present invention, since the lens has a refracting portion that bends the light beam passing between the curved surface and the joint surface at an arbitrary angle, the optical axis alignment with the optical element can be performed even with a prism lens. It can be done easily and accurately.

It is a side view which shows the structure of the optical package and alignment apparatus which concern on Embodiment 1 of this invention. It is a side view which shows the structure of the optical package which concerns on Embodiment 1 of this invention, and shows the state before prism lens joining. It is a side view which shows the structure of the optical package which concerns on Embodiment 1 of this invention. It is a side view which shows the modification of the optical package which concerns on Embodiment 1 of this invention. It is a side view which shows the structure of the optical package which concerns on Embodiment 2 of this invention, and shows the state before prism lens joining. It is a side view which shows the modification of the optical package which concerns on Embodiment 1 of this invention, and shows the state before lens joining. It is a side view explaining the conventional alignment method, and shows the case where a lens and an optical element are aligned. It is a side view explaining the conventional alignment method, and shows the case where a prism lens and an optical element are aligned.

Embodiment 1 FIG.
1 and 2 are side views showing the configuration of the optical package 1 according to Embodiment 1 of the present invention. In the optical package 1 used in the first embodiment, the optical element 3 is fixed on the substrate 6 by the mold part 2 and is made of a translucent resin, as in the optical package 1 shown in FIG. It is sealed. As the optical element 3, a light receiving element, a light projecting element (for example, Light Emitting Diode) or the like is used. Note that the illustrated example is a schematic diagram, and details of wires and the like that connect the optical element 3 and the substrate 6 are omitted.

In order to join and integrate the prism lens 30 to the optical package 1, a positioning convex portion 40 and a positioning concave portion 41 are newly provided.
The positioning convex portion 40 is provided on the bonding surface 5 of the optical package 1. The positioning convex portion 40 is preferably made of a material that transmits a light wavelength that can be recognized by the alignment device 20 and a material that has a refractive index close to that of the prism lens 30 that is attached to the optical package 1. For example, a transparent film, a resin molded product, or the like is used. The shape of the positioning convex portion 40 may be a circle as displayed on the monitor screen 22, or may be a square, for example.
Moreover, although the rectangular parallelepiped optical package 1 and the optical element 3 are shown in the illustrated example, the shape is not limited to this, and any shape may be used as long as the center position of the optical element 3 can be obtained from the outer shape. Here, the obtained outer center X3 is regarded as the optical axis of the optical element 3.

  The positioning convex portion 40 aligns (aligns) the outer shape center X40 of the positioning convex portion 40 with the outer shape center X3 of the optical element 3 using the conventional aligning device 20, and uses an adhesive, laser welding, or the like. Glue. When the optical package 1 is used by being incorporated in a photoelectric sensor or the like, an adhesive made of a material corresponding to the purpose of use is used. For example, when the optical package 1 is used for light projection of a photoelectric sensor, the adhesive is made of a material that transmits a light wavelength for detection.

  Further, the positioning concave portion 41 is provided on the joint surface 34 of the prism lens 30. As shown in FIG. 2, the positioning concave portion 41 is larger than the positioning convex portion 40 so as to be fitted. The positioning recess 41 may be formed at the same time when the prism lens 30 is formed by forming a transparent resin with a mold, for example.

  FIG. 3 shows a configuration of the optical package 1 in which the prism lens 30 is joined and integrated. By fitting the positioning concave portion 41 into the positioning convex portion 40 aligned with the outer shape center X3 of the optical element 3, the alignment accuracy of the optical element 3 and the prism lens 30 can be easily secured. The fitting between the positioning convex portion 40 and the positioning concave portion 41 may be press-fitting by press-fitting or adhesive fixing using an adhesive or the like. However, it is necessary to select the material of the adhesive according to the use of the optical package 1 as described above. In order to maintain translucency, it is desirable not to provide fixing means such as an adhesive on the contact surfaces of the positioning convex portion 40 and the positioning concave portion 41. Therefore, when fixing using a fixing means such as an adhesive, the adhesive is applied only to the bonding surface 5 and not applied to the top surface of the positioning convex portion 40 and the bottom surface of the positioning concave portion 41. It is desirable to make it.

  Further, in order to increase the positioning accuracy between the outer shape center X3 of the optical element 3 and the outer shape center X31 of the lens portion 31, the outer shape center X40 of the positioning convex portion 40 is set in advance to a position corresponding to the outer shape center X3 of the optical element 3. While aligning, the outer center of the positioning recess 41 is aligned to a position corresponding to the outer center X31 of the lens unit 31. In addition, since the positioning concave portion 41 is fitted into the positioning convex portion 40 as described above, the center of the outer shape of both can be accurately positioned. As a result, the positioning accuracy between the outer shape center X3 of the optical element 3 and the outer shape center X31 of the lens portion 31 is improved. Can be improved.

  As described above, according to the first embodiment, the optical package 1 containing the optical element 3, the condensing lens portion 31, and the refraction prism portion 32 are joined and integrated with the optical package 1. The positioning convex portion 40 and the positioning concave portion provided on the joint surface 5 of the optical package 1 and the joint surface 34 of the prism lens 30 for aligning the optical axes of the prism lens 30, the optical element 3 and the prism lens 30. 41. For this reason, if the optical package 1 and the prism lens 30 are joined while the positioning convex portion 40 and the positioning concave portion 41 are fitted, the optical element 3 and the prism lens 30 can be aligned, so that alignment is easy. Become. Further, it does not include a step of imaging the optical element 3 with the camera 21 via the lens portion 31 of the prism lens 30 as in the conventional case, and can be aligned by fitting the positioning convex portion 40 and the positioning concave portion 41. Therefore, alignment can be performed accurately.

The prism lens 30 illustrated in FIGS. 1 to 3 is configured to bend the optical axis of the light beam passing between the curved surface 33 and the joint surface 34 by 90 degrees on the reflecting surface of the prism portion (refractive portion) 32. However, the present invention is not limited to this, and a prism lens having a configuration that bends the optical axis to an arbitrary angle such as the prism lens 30 shown in FIGS. 4A and 4B can also be used.
1 to 4 show an example in which the outer shape of the joint surface 34 of the prism lens 30 is smaller than the outer shape of the joint surface 5 of the optical package 1. It goes without saying that it can be large or the same.

Embodiment 2. FIG.
In the first embodiment, the positioning convex portion 40 is provided in the optical package 1 and the positioning concave portion 41 is provided in the prism lens 30. On the contrary, the positioning concave portion 41 is provided in the optical package 1 and the prism lens 30 is provided. The structure which provides the convex part 40 for positioning may be sufficient. An example is shown in FIG. The positioning member 42 provided with the positioning concave portion 41 is aligned with the outer center X3 of the optical element 3 and adhered to the joint surface 5, and the positioning convex portion 40 is adjusted to the outer center X31 of the lens unit 31. The optical package 1 and the prism lens 30 are bonded together while the positioning convex portion 40 and the positioning concave portion 41 are fitted together. As the positioning member 42, a transparent film or a black light shielding material or the like can be used in order to have a function of a diaphragm.
In the illustrated example, the positioning member 42 is separately prepared and the positioning recess 41 is provided. However, the positioning recess 41 may be provided directly on the joining surface 5.

  As described above, according to the second embodiment, the positioning convex portion 40 is provided on the joint surface 34 of the prism lens 30 and the positioning concave portion 41 is provided on the joint surface 5 of the optical package 1. As in 1, it can be easily and accurately aligned.

  In the first and second embodiments, the case where the prism lens 30 is attached to the optical package 1 has been described as an example. However, the type of lens to be attached is not limited to this, and for example, one side as shown in FIG. Alternatively, the lens 10 may have a curved surface 11 and a cemented surface 12 formed on the other surface. In the case of FIG. 6, the positioning convex portion 40 is formed on the joint surface 5 of the optical package 1, and the positioning concave portion 41 is formed on the joint surface 12 of the lens 10. Alternatively, the positioning concave portion 41 may be formed on the bonding surface 5 and the positioning convex portion 40 may be formed on the bonding surface 12.

  Moreover, you may comprise the convex part 40 for positioning using an optical filter. As the optical filter, a polarizing filter and a wavelength filter (color filter, infrared filter, etc.) can be used. By configuring the positioning convex portion 40 using these, the optical package 1 and the optical filter can be handled integrally, whereas conventionally, an optical filter must be separately provided on the optical path. The ease of assembly is improved.

DESCRIPTION OF SYMBOLS 1 Optical package 2 Mold part 3 Optical element 4 Sealing part 5 Joint surface 6 Board | substrate 10 Lens 11 Curved surface 12 Joint surface 20 Alignment apparatus 21 Camera 22 Monitor screen 23 Camera 24 Monitor screen 30 Prism lens 31 Lens part 32 Prism part (refraction) Part)
33 Curved surface 34 Joint surface 40 Positioning convex part 41 Positioning concave part 42 Positioning member X3 Center of outer shape of optical element 3 (optical axis)
X10 Center of outer shape of lens 10 (optical axis)
X31 Center of outer shape of lens unit 31 (optical axis)
X40 Center of outer shape of positioning convex part 40

Claims (3)

An optical package containing the optical element;
A condensing lens that is joined to and integrated with the optical package;
Wherein aligning the optical axis of the optical element and the lens, Bei example and the optical package and positioning the concave-convex portion provided relatively on the bonding surface of the lens,
The positioning recess is provided on the joint surface of the optical package, and the center of the outer shape is aligned with the optical axis of the optical element,
The positioning convex part is provided on the cemented surface of the lens, and the outer center is aligned with the optical axis of the lens . Positioning protrusions, optical package according to claim 1, characterized in that an optical filter. Lens has a curved surface for collecting light, a bonding surface for bonding the optical package, according to claim 1 or claim characterized in that it comprises a bent portion for bending in any angle a light beam passing between the said curved surface and the bonding surface Item 3. The optical package according to Item 2 .

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