JP2009025458A - Optical module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical module capable of obtaining high light coupling efficiency while achieving miniaturization. <P>SOLUTION: The optical module 1 includes a light emitting element 11, and a lens member 15 for collimating light from the light emitting element 11. The lens member 15 forms a plurality of planes in parallel to a lens optical axis on the outer periphery, and a distance with the lens optical axis is different from the other plane in at least one of the plurality of the planes, and the plane of the lens member 15 is selectively bonded on a mounting face 14b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical module including a lens member used for optical communication, which collimates or condenses light from a light emitting element or condenses incident light on a light receiving element.

  Conventionally, there are two types of mounting methods for mounting an optical coupling system (lens) of an optical module. One is passive alignment, for example, by creating a mounting guide such as a V-groove with high accuracy in the optical axis direction by anisotropic etching on a silicon substrate, and mounting a lens on the mounting guide. Lens alignment is performed (for example, Patent Document 1). This method has the advantage of simple assembly and short mounting time, but the optical coupling efficiency is determined by the dimensional accuracy of the mounting guide, etc., and the mounting accuracy of the lens, light emitting element, etc., and raising these accuracy costs high. Therefore, it is difficult to increase the optical coupling efficiency (the optical coupling efficiency of the light emitted from the light emitting element to the optical fiber).

  The second mounting method optimizes the lens while monitoring the position and direction of the light emitted from the light emitting element (for example, semiconductor laser (LD)) or the optical power that is actually coupled to the optical fiber. Active alignment that adjusts to a position. In particular, in an optical module for long-distance high-speed communication, active alignment is suitable because high optical coupling efficiency is required.

For example, the optical module described in Patent Document 2 is an optical transmission module, and includes an L-shaped metal member (L carrier) in side view on which a semiconductor optical element is mounted. An opening for allowing the emitted light to pass therethrough is provided, and a lens is provided in the opening. In this optical transmission module, by moving the lens holder along the front wall so that the light emitted from the light emitting element is optimally optically coupled to the optical fiber via the lens provided in the opening, the lens Alignment is performed, and a metal lens holder is fixed to the front wall portion of the L carrier by YAG welding. In this way, high optical coupling efficiency is achieved.
However, since the optical module described in Patent Document 2 has a large number of parts, it is difficult to reduce its size.

Therefore, Patent Document 3 includes a carrier on which a light emitting element is mounted and a lens having an installation surface. The lens is mounted such that the installation surface is in contact with the first mounting surface of the carrier via an adhesive. An optical transmission module in which a light emitting element is mounted on a second mounting surface is proposed. In this optical transmission module, the lens is moved so that its installation surface is along the mounting surface of the carrier, so that the light emitted from the light emitting element is optimally optically coupled to the optical fiber via the lens. High optical coupling efficiency is obtained because it is mounted at (position). Further, the optical transmission module of Patent Document 3 is different from that of Patent Document 2 in that it does not need to provide an opening hole in the carrier, does not require a lens holder, and has a small number of components. Miniaturization can be realized.
Japanese Patent Laid-Open No. 11-346443 JP-A-9-178986 JP 2003-168838 A

  However, in the optical transmission module of Patent Document 3, active alignment is not performed in the direction perpendicular to the mounting surface when the lens is mounted, and the adjustment of the lens position in this direction is specified in Patent Document 3. Not. As this adjustment method, it is conceivable to change the height of the first surface or the second surface of the carrier on which the lens or the semiconductor light emitting element is mounted, or to change the size of the lens. Then, the optical coupling efficiency depends on the dimensional accuracy of the lens or the like. There is room for improvement to obtain higher coupling efficiency.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an optical module capable of obtaining high optical coupling efficiency while realizing miniaturization.

  An optical module of the present invention includes a lens member that collimates or condenses light from a light emitting element or condenses incident light on a light receiving element, and the lens member is parallel to the lens optical axis. A plurality of planes are formed on the outer periphery, and at least one of the plurality of planes is different in distance from the lens optical axis from the other planes, and the plane of the lens member is selectively adhered to the mounting surface. To do.

  Moreover, it is preferable that the lens member is formed on the outer periphery with a surface whose distance from the lens optical axis is smaller than a plane. It is also preferable that the outer peripheral shape of the lens member viewed from the lens optical axis direction is a polygon.

  According to the optical module of the present invention, the lens member has a plurality of planes around the mounting surface on which the lens member is mounted, and the distance between the plane and the lens optical axis varies depending on the plane. Therefore, the distance from the mounting surface to the lens optical axis can be adjusted by appropriately selecting the surface to be bonded to the mounting surface among the plurality of planes. Thereby, the lens member can be easily aligned in the direction perpendicular to the optical axis direction and perpendicular to the lens member mounting surface, and higher optical coupling efficiency can be obtained.

In recent years, a compact optical transceiver for long-distance high-speed transmission has been strongly demanded. For example, a small optical transceiver compliant with the industry standard of XFP-MSA is required to have high performance such as a transmission speed of 10 Gbps and a transmission distance of 40 km or more. Moreover, in the small optical transceiver based on the industry standard, the pitch between the two cores of the two-fiber optical connector to be attached and detached is 6.25 mm. Further, the lateral width and height of the XFP optical transceiver are defined to be 18.35 mm and 8.5 mm, respectively. Therefore, the optical transmission module and the optical reception module housed in the XFP optical transceiver need to be further miniaturized. For example, it is necessary to keep the width and height of the outer shape of the optical transmission module within approximately 6 mm × 6 mm.
The optical module of the present invention satisfies the above requirements.

  The optical module of the present invention includes an optical transmission module in which a semiconductor laser (LD) is mounted as a light emitting element, an optical reception module in which a photodiode (PD: Photo Diode) is mounted as a light receiving element, and the like. . Below, the optical module of this invention is demonstrated by the example comprised as an optical transmission module provided with LD.

  1 to 4 are diagrams for explaining an outline of an example of a photoelectric conversion (optical transmission) module according to the present invention. FIG. 1 is a perspective view showing an external appearance of the optical transmission module, and FIG. 2 is a partial sectional perspective view of the optical transmission module. 3 is a cross-sectional view of the optical transmission module, and FIG. 4 is a top view of the optical transmission module. 2 to 4, the illustration of the lid 12d is omitted.

  As shown in FIG. 1, the optical transmission module 1 includes an optical transmission unit 10 that performs photoelectric conversion, a sleeve member 20 into which a ferrule of an optical connector is inserted from the front, an LD of the optical transmission unit 10, and a sleeve member 20. And an optical coupling member 30 for optically coupling a light guide portion of a stub described later. In the following description, the side including the sleeve member 20 is referred to as the front, and the opposite side is referred to as the rear.

The optical transmitter 10 has a substantially rectangular parallelepiped shape and includes a package 12 that forms a space for accommodating an LD. Package 12 includes a bottom wall 12a, a package main body portion 12b of the side wall 12b ₁ and the rear wall 12b ₂ and the like are integrally formed, a front wall 12c, and the lid 12d, a. The front surface of the front wall 12c, attached optical coupling member 30 to the sleeve member 20 is fixed to the front, the rear surface of the rear wall 12b _2, lead pins 12e for providing the high frequency modulation signal is provided to the LD . Furthermore, although the lead pin 12f is also provided on one outer surface of the side wall 12b _1, the lead pin 12f is used to input and output of the DC or low frequency signals, for example, the input bias current of the LD, later It is used for the power supply of the electronic cooler, the output of the monitor PD element, the output of the temperature measuring element, etc.

  The bottom wall 12a constituting the package 12 is made of a material having a high thermal conductivity such as CuW, for example, and has a pedestal portion 12g formed one step higher than the other portions as shown in FIGS. An electronic cooler 13 composed of a Peltier element or the like is mounted on the pedestal portion 12g to cool the LD 11, and a carrier 14 on which the LD 11 or the like is mounted is mounted on the electronic cooler 13. It is installed. A lens member 15 according to the present invention is also mounted on the carrier 14.

  The package body 12b is made of a multilayer ceramic made of an alumina material, and multilayer wiring is formed on the surface and inside of the multilayer ceramic. The multilayer wiring is used for electrical connection between various components mounted in the package 12 and lead pins 12e and 12f provided on the outer portion of the package body 12b of the package 12. The lead pins 12e and 12f are made of a metal such as Kovar, for example.

Further, as shown in FIGS. 2 and 3, the rear wall 12 b ₂ of the package main body 12 b is formed with a protrusion 12 h that protrudes in the space direction (front) in the package 12. A wiring pattern 12i is formed on the uppermost layer of the multilayer ceramic substrate layer of the projecting portion 12h, and a PD carrier 17 on which a monitor PD16 that receives the rear light of the LD 11 is mounted in advance is mounted on the wiring pattern 12i. Yes.
Further, the lower front of the package body portion 12b, as shown in FIGS. 3 and 4, are formed L-shaped portion 12b ₃ of the L-shaped continuous from the side wall 12b _1, a multilayer ceramic of the L-shaped portion 12b ₃ A wiring pattern 12j that is electrically connected to the wiring pattern 13a of the electronic cooler 13 is formed on the uppermost layer of the substrate layer.

  The front wall 12c and the lid 12d are made of a metal such as Kovar, for example. The front wall 12c is provided with a through hole 12k for passing an optical signal from the LD 11, and this through hole 12k is closed by an optical window 12n. Further, the lid 12d closes the upper part of the package 12.

  In the package 12, the bottom wall 12a and the package main body portion 12b, and the package main body portion 12b and the front wall 12c are joined (for example, by silver solder), and a metal ring 12m made of Kovar or the like is disposed above the joined portions. For example, airtightness is ensured by joining by silver soldering and joining the lid 12d to the upper surface of the metal ring 12m by seam welding or the like.

As shown in FIGS. 2 to 4, the optical transmission unit 10 includes an LD 11 in the package 12 as described above. The LD 11 is of a DFB (Distributed Feedback) type, for example, and is mounted on a carrier 14 attached to the electronic cooler 13 on the bottom wall 12a.
The lens member 15 is for making collimated light, and is formed of, for example, a square aspheric lens as shown in FIG. Details of the lens member 15 according to the main part of the present invention will be described later.

  As shown in FIG. 3, the carrier 14 on which the LD 11 and the lens member 15 are mounted has a step, and the LD 11 and the like are mounted on the higher plane, and the lens member 15 is mounted on the lower plane. It is done. Here, the plane on which the LD 11 is mounted is referred to as a first mounting surface 14a, and the second mounting surface 14b on which the lens member 15 is mounted.

On the first mounting surface 14a of the carrier 14, the LD 11 is mounted with its optical axis aligned, and a wiring pattern 14c is formed (see FIGS. 2 and 4). On the wiring pattern 14c, the LD 11, the transistor 18 for driving the LD 11 at a high frequency, and the temperature measuring element 19 for measuring the temperature of the LD 11 are mounted. The carrier 14 is made of, for example, AlN, which is an insulating material having good thermal conductivity, and transfers heat from the LD 11 to the electronic cooler 13 to efficiently cool the LD 11. The wiring pattern 14c on the carrier 14 is electrically connected to the wiring pattern 12i of the multilayer ceramic substrate layer by a bonding wire.
Wiring pattern 13a on an electronic cooling device 13, similarly to the wiring pattern 14c of the carrier 14, electrically connected by wiring patterns 12j and the bonding wire of the laminated ceramic substrate layers of the L-shaped portion 12b ₃ (cooler wiring layer) Is done.

The optical transmitter 10 has the above-described configuration, collimates the light from the LD 11 with the lens member 15, and emits the collimated light forward through the optical window 12n. An optical coupling member 30 is attached to the front surface of the front wall 12c to which the optical window 12n is attached by seam welding or the like.
The optical coupling member 30 includes a lens 31 that collects light from the optical transmission unit 10 and an isolator 32 that removes reflection return of light from the LD 11 toward a stub described later of the sleeve member 20. The lens 31 and the isolator 32 are held by a lens holder 33 and an isolator holder 34, respectively.

  As shown in FIG. 3, the rear end surface of the optical coupling member 30 is a slide surface that is slidable in the direction perpendicular to the optical axis on the front end surface of the package 12 of the optical transmission unit 10. Can be adjusted in the optical axis (Z-axis in the figure) and the vertical plane (in the XY plane). The isolator holder 34 is slidably rotatable on the outer periphery of the lens holder 33 around the central axis of the lens holder 33. Therefore, alignment around the optical axis of the isolator 32 can be performed so that polarized light is most transmitted when the light from the LD 11 enters the isolator 32.

  A sleeve member 20 is attached to the front end surface of the optical coupling member 30. The sleeve member 20 includes a stub 21, a sleeve 22, and a bush 23. The stub 21 has a light guide portion 21a (hereinafter referred to as an optical fiber 21a) such as an optical fiber at the center thereof, and light from the LD 11 is condensed by the lens 31 at the rear end of the optical fiber 21a. . The front end of the stub 21 is processed into a convex shape so as to physically contact a ferrule (not shown) of the optical connector.

  The sleeve 22 holds a stub 21 via a bush 23 behind it, and a ferrule (not shown) of an optical connector is inserted in front of the sleeve 22. The sleeve 22 guides the ferrule so that when the ferrule of the optical connector is inserted, the optical fiber (not shown) in the ferrule and the optical fiber 21a in the stub 21 are abutted with each other. The optical fiber in the ferrule of the optical connector and the optical fiber of the stub 21 are in physical contact with each other as a result of the above-mentioned matching. As a result, the light from the LD 11 reaches the optical fiber in the ferrule, and the light Propagates through the fiber.

  The bush 23 press-fits the stub 21. The rear end surface is a slide surface that is slidable in the direction perpendicular to the optical axis on the front end surface of the optical coupling member 30, so that the position adjustment between the LD 11 and the optical fiber 21 a in the stub 21 can be adjusted. Can be done within.

  Next, the lens member according to the main part of the present invention will be described with reference to FIG. FIG. 5 is a diagram for explaining an outline of an example of a lens member mounted on the optical transmission module according to the present invention, FIG. 5 (A) is a front view of the lens member, and FIG. 5 (B) is a side view thereof. It is.

  The lens member 15 is for making collimated light as described above, and is attached to the second mounting surface 14b of the carrier 14. Therefore, as shown in FIG. 5, the lens member 15 includes an aspheric lens portion (hereinafter referred to as a lens portion) 15 a that collimates the light from the LD 11 and an attachment portion 15 b that is attached to the carrier 14. Further, the lens member 15 has a regular polygonal shape (in this example, a square) as viewed from the center axis direction of the lens portion 15a.

  A plurality of flat surfaces (tangential planes) 15c to 15f that are in contact with the second mounting surface 14b of the carrier 14 and bonded with an ultraviolet curable resin or the like are formed on the mounting portion 15b of the lens member 15, that is, on the outer periphery of the lens portion 15a. Has been. These tangent planes 15c to 15f are planes parallel to the central axis (lens optical axis) of the lens unit 15a of the lens unit 15.

  The aspheric lens portion 15 a is formed such that the center axis (lens optical axis) O of the lens portion 15 a is deviated from the outer center of the lens member 15. Therefore, at least one of the distances A to D between the lens optical axis O and the tangential planes 15c to 15f is different from the others, and preferably the distances A to D are different from each other. The distances A to D between the lens optical axis O and the tangential planes 15c to 15f may be selected as appropriate values depending on the dimensional accuracy of components and semiconductor optical elements. However, if dimensional tolerances generally used are taken into consideration. At present, the difference between the maximum value and the minimum value is preferably about 20 μm.

  When such a lens member 15 is attached to the second mounting surface 14b of the carrier 14, for example, an ultraviolet curable resin or the like is applied to the second mounting surface 14b in advance. Then, after aligning in the optical axis direction, aligning in the plane perpendicular to the optical axis, and then irradiating the resin with ultraviolet rays, the lens member 15 can appropriately collimate the light from the LD 11. Can be fixed to.

Next, a method for aligning the lens member 15 will be described with reference to FIGS.
FIG. 6 is a diagram for explaining an outline of an example of an alignment system for aligning the lens members of the optical transmission module according to the present invention.

  For example, as shown in FIG. 6, the lens member alignment system includes a PKG fixing base 50 on which the package 12 of the optical transmission module is fixed, and light for monitoring light emitted from the package 12 of the optical transmission module. And a monitor device 60. The optical monitor device 60 includes an infrared (IR) camera 61 configured by a vidicon camera, a CCD camera, or the like that receives light from the LD 11 or the like, and a display device 62 that displays an image captured by the IR camera 61. Have.

In this alignment system, the position of the IR camera 61 is adjusted in advance, and an optical image emitted from the optical window of the package 12 and observed by the IR camera 61 and displayed on the screen of the display device 62 is displayed on the display device 62. If it is located at the center of the screen and its outline is not blurred, it can be seen that the collimated light has no axis misalignment.
Therefore, a person who attaches the lens member 15 to the optical transmission module in this alignment system looks at the screen of the display device 62 on which the image of the IR camera 61 that receives the light from the LD 11 via the lens member 15 is displayed. The position of the lens member 15 is adjusted.

The position adjustment of the lens member is performed using a suction collet (hereinafter referred to as a collet).
7A and 7B are views for explaining a collet used for aligning and attaching the lens member to the optical transmission module. FIG. 7A is a partially enlarged view of the collet, and FIG. 7B is a collet. FIG. 7C is a front view of the suction holding unit.

  The collet 70 is for carrying and moving the lens member 15, and has a suction holding portion 71 for holding the lens member 15 as shown in FIG. 7A. An adsorption port 72 for adsorbing the lens member 15 is formed on the lower side of the adsorption holding unit 71. As shown in FIG. 7C, the lens member 15 is held on its two sides (two surfaces) by the suction holding portion 71 and is carried from the outside into the optical transmission module in this state, and the second mounting of the carrier 14 It is placed on the surface 14b.

  The lens member 15 has an optical axis direction (Z direction (see FIG. 3)) of the LD 11 and a direction perpendicular to the optical axis direction of the LD 11 and parallel to the second mounting surface 14b of the carrier 14 (X direction ( 3))), the alignment can be performed by moving the mounting surface 14b using the collet 70.

  However, the lens member 15 is moved in the direction perpendicular to the optical axis direction of the LD 11 and in the direction perpendicular to the second mounting surface 14b (Y direction (see FIG. 3)) on the second mounting surface 14b. Alignment cannot be performed. For the Y direction, for example, as shown in FIG. 3, a lens member having a lens optical axis at a position offset from the center of the outer shape to a predetermined direction and distance is used, and which tangent plane contacts the second mounting surface 14b. Positioning can be performed by selecting whether to fix.

  As a method for selecting a tangent plane to be brought into contact with and fixed to the second mounting surface 14b among the tangent planes 15c to 15f, a method in which the lens member 15 is changed is considered. However, if the work of changing the lens member 15 is added, an unexpected positional shift or the like may be caused. Therefore, as shown in FIG. 8, the lens member 15 is rotated on the mounting surface 14b by the method of rotating the second mounting surface 14b. The tangent plane that touches can be changed.

In the method of FIG. 8, the lens member 15 rotates on the mounting surface 14b around the contact point P with the mounting surface 14b by stopping the suction operation at the collet 70 and moving the collet 70. The tangential plane actually in contact with the surface 14b can be changed from the tangential plane 15e to the tangential plane 15f.
When the tangential plane that is actually in contact with the mounting surface 14b is changed, the X direction is adjusted (and the Y direction is adjusted if necessary) in the same manner as described above, and the position of the lens member 15 is adjusted.

  If the position of the lens member 15 is adjusted and a desired image is obtained on the screen of the display device 62 of the light monitor device 60, the lens member 15 is arranged without axis misalignment, and the collimated light is obtained at an appropriate position. Since it is understood that the lens member 15 exists, the lens member 15 may be fixed at that position.

Next, another example of the lens member will be described.
FIG. 9 is a view showing another example of the lens member, FIG. 9 (A) is a front view thereof, and FIG. 9 (B) is a side view thereof.
Similar to the lens member 15, the lens member 15 ′ includes an aspheric lens portion 15a for collimating light from the LD 11, and an attachment portion 15b ′ for attachment to the carrier 14, and the lens portion 15a. The distances A to D between the central axis (lens optical axis) O and the tangent planes 15c to 15f of the attachment portion 15b ′ are different from each other. The lens member 15 ′ is fixed with an ultraviolet curable resin, and the resin is applied to the mounting surface 14b in advance at the time of optical axis adjustment (position alignment) as described above.

  Therefore, when the lens member 15 in FIG. 5 is rotated on the mounting surface 14b as shown in FIG. In order to avoid this, as shown in FIG. 9B, a recess (groove) 15g is provided on the tangent plane of the lens member 15 ', and the lens optical axis of the lens portion 15a is formed on the outer periphery of the lens portion 15a. A surface having a distance smaller than the tangential plane 15c to 15f is formed.

  By forming the lens member 15 ′ in this way, the ultraviolet curable resin can be attached only to the outermost peripheral surface, and the ultraviolet curable resin can be prevented from contacting the recess 15 g. Therefore, when adsorbing the lens member 15 ′ with the collet 70, the lens member 15 ′ can be held without the UV curable resin adhering to the collet 70 by gripping the surface in the recess 15 g. The process can be shortened and / or simplified.

  FIG. 10 is a view showing still another example of the lens member, FIG. 10 (A) is a front view thereof, and FIG. 10 (B) is a side view thereof. The lens member in the example of FIGS. 5 and 9 has a square outer shape when viewed from the front, and four tangent planes are formed. However, the number of outer shapes and tangent planes is limited to the above example. Instead, as shown in FIG. 10, for example, it may have a regular hexagonal shape when viewed from the front, and six tangential planes 15h to 15m may be formed. In the lens member 15 '' in FIG. 10, the lens optical axis O does not coincide with the center axis of the outer shape as in the above example, and the distance E from the lens optical axis O to each tangential plane 15h to 15m. ~ J is at least one different from the others, preferably different from each other. Further, it is preferable that the lens member 15 'of FIG.

  As described above, by forming many tangential planes having different distances from the lens optical axis, it is possible to finely adjust the positioning in the direction perpendicular to the mounting surface 14b.

  In the above, the optical transmission module has been described as a two-lens system having a collimating lens and a condensing lens and having a lens member as a collimating lens. There may be. The shape of the lens portion of the lens member is not limited to an aspherical surface, and may be a spherical surface like a ball lens.

As described above, according to the present invention, the lens member is mounted on the mounting surface of the carrier, and all the positions in the XYZ directions can be fixed. This makes it possible to couple the light emitted from the semiconductor optical device to the optical fiber with high coupling efficiency, in addition to features advantageous for miniaturization with a small number of parts.
By providing a groove or recess on the tangent plane of the lens member and holding the groove or recess so that the resin does not adhere to the collet, the gripping surface is selected again even after the resin adheres to the lens member. It becomes possible to re-grip (re-adsorb).

It is a perspective view which shows the external appearance of the optical module by this invention. 1 is a partial cross-sectional perspective view of an optical module according to the present invention. It is sectional drawing of the optical module by this invention. It is a top view of the optical module by this invention. It is a figure explaining an example of the lens member of the optical module by this invention. It is a figure explaining the outline of an example of the alignment system for aligning the lens member of the optical module by this invention. It is a figure explaining the collet used for position alignment and attachment of a lens member. It is a figure explaining the positioning method of a lens member. It is a figure explaining the other example of the lens member of the optical module by this invention. It is a figure explaining the other example of the lens member of the optical module by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical module (optical transmission module), 10 ... Optical transmission part, 11 ... LD, 12 ... Package, 12a ... Bottom wall, 12b ... Package main-body part, 12b ₁ ... Side wall, 12b ₂ ... Rear wall, 12b ₃ ... L Character part, 12c ... Front wall, 12d ... Lid, 12e, 12f ... Lead pin, 12g ... Base part, 12h ... Projection part, 12i, 12j ... Wiring pattern, 12k ... Through hole, 12m ... Metal ring, 12n ... Optical window, DESCRIPTION OF SYMBOLS 13 ... Electronic cooler, 13a ... Wiring pattern, 14 ... Carrier, 14a ... 1st mounting surface, 14b ... 2nd mounting surface, 14c ... Wiring pattern, 15 ... Lens member, 15a ... (Aspherical) lens part, 15b ... Attachment part, 15c-15f ... contact plane, 15g ... recess, 15h-15m ... contact plane, 16 ... monitor PD, 17 ... PD carrier, 18 ... transistor, 19 ... temperature sensor, 2 ... Sleeve member, 21 ... Stub, 21a ... Light guide part (optical fiber), 22 ... Sleeve, 23 ... Bush, 30 ... Optical coupling member, 31 ... Lens, 32 ... Isolator, 33 ... Lens holder, 34 ... Isolator holder, DESCRIPTION OF SYMBOLS 50 ... PKG fixing stand, 60 ... Optical monitor apparatus, 61 ... IR camera, 62 ... Display apparatus, 70 ... Collet, 71 ... Adsorption holding part, 72 ... Adsorption port.

Claims (3)

An optical module comprising a lens member that collimates or condenses light from a light emitting element or condenses incident light on a light receiving element,
The lens member is formed on the outer periphery with a plurality of planes parallel to the lens optical axis,
At least one of the plurality of planes is different in distance from the lens optical axis from other planes,
The optical module, wherein the plane of the lens member is selectively adhered to a mounting surface.   2. The optical module according to claim 1, wherein a surface of the lens member having a distance from the lens optical axis smaller than the plane is formed on an outer periphery.   The optical module according to claim 1, wherein the lens member has a polygonal outer peripheral shape when viewed from the lens optical axis direction.

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