JP3137003U - Alignment device for optical module assembly - Google Patents

Abstract

An object of the present invention is to reduce the cost while shortening the alignment time when aligning the light emitting side optical component that emits laser light in the infrared region and the light receiving side optical component, and to facilitate initial adjustment and maintenance. An alignment device for assembling an optical module is provided.
A light-emitting side optical component 60 and a light-receiving side optical component 80 are relatively movable in XYZ directions. Laser light in the infrared region emitted from the light-emitting side optical component 60 forms an image as a visible image on the IR sensor 28, and this is imaged by the visible camera 26. Based on the captured two-dimensional image, XYZ coordinate values of the image are specified by image processing. The optical axis is coarsely adjusted based on the specified coordinate values, the light-emitting side optical component 60 is operated after the coarse adjustment, and the optical axis is further finely adjusted based on the measurement data in the power meter.
[Selection] Figure 1

Description

  The present invention relates to a centering device for assembling an optical module composed of a light emitting side optical component and a light receiving side optical component.

  An optical module used for optical communication or the like is assembled by connecting a light emitting side optical component having a laser diode, a lens or the like and a light receiving side optical component such as an optical fiber. At this time, the optical axes of the light emitting side optical component and the light receiving side optical component are made to coincide with each other by alignment. In order to ensure the light transmission efficiency, alignment is a very important process.

  FIG. 8 is an explanatory diagram of the alignment operation by the conventional alignment apparatus. In the conventional alignment device, the light-emitting side optical component 60 and the light-receiving side optical component 80 are attached to a base (not shown) that is relatively movable in the XYZ directions orthogonal to each other, and the optical fiber 54 of the light-receiving side optical component 80 is A power meter 42 is connected to the end, and the position at which the measured value of the power meter 42 is maximized is determined to perform welding joining. In the conventional alignment apparatus, since the diameter of the optical fiber is small, the scanning route for searching for the point (measurement point) at which the value of the power meter 42 is maximum becomes relatively long in the same region, and as a result, the time required for alignment The problem that is likely to become long occurs. In order to solve this, a coarse alignment core is required to temporarily match the positions of the light emitting side and the light receiving side.

Hereinafter, prior arts related to alignment (Patent Documents 1 to 4 below) will be described.
JP 2003-177285 A JP 2003-035847 A JP 09-061752 A JP 05-288965 A

  Patent Document 1 discloses an alignment method and the like in assembling an optical module composed of a light emitting element side portion and an optical fiber side portion. In this method, before the alignment based on the intensity of light coupled from the light emitting element side portion to the optical fiber side portion, the position of the condensing point on the light emitting element side and the coupling end of the optical fiber is relatively set by the two-dimensional imaging means. By roughly measuring them and bringing them close in advance, the range in which the light emitting element side and the optical fiber side are relatively moved during alignment is reduced, and the alignment time is shortened (paragraph [0035] etc.).

  Patent Document 2 discloses an optical axis alignment device that performs optical axis alignment between optical components. This apparatus is an image processing apparatus in which the laser light from the laser diode is imaged by a CCD camera prior to alignment while measuring the power of the laser light from the laser diode by the optical power detection device connected to the optical fiber. Is used to detect the position information of the laser beam, and based on the detected position information, the laser beam of the light-emitting side block is positioned in advance within the receivable range of the optical fiber of the light-receiving side block (paragraphs [0040] to [0042], etc.) . As a result, the alignment time is shortened as in the alignment method of Patent Document 1.

  Patent Document 3 discloses an optical axis alignment method that is indispensable when combining optical components such as semiconductor lasers, light receiving elements, and optical fibers used in optical communication and optical measurement with optical fibers or arrays thereof. In this method, a two-dimensional position detector having a large light receiving area and an optical fiber tip are supported by the same three-dimensional drive system, and the maximum amount of laser light from the semiconductor laser (optimum coupling position) is supported by the two-dimensional position detector. Is instantly detected, and the tip of the optical fiber is moved to that point before fine adjustment (paragraph [0031] etc.). Patent Document 3 also aims to shorten the alignment time.

  Patent Document 4 discloses an optical fiber alignment fixing device that aligns and fixes optical elements such as laser diodes and photodiodes and optical fibers. This apparatus detects a surface contact between a joint surface of an optical element holder that holds an optical element and a joint surface of an optical fiber holder that holds an optical fiber by a load sensor. The joining surface is fixed in an angle state where the joining surface is in surface contact with the joining surface of the optical fiber holder. Then, the joint surface of the optical fiber holder is separated from the joint surface of the optical element holder, and alignment is performed. By bringing them into close contact with each other, both the joint surfaces are brought into surface contact in the aligned state. Allowed (paragraph [0026] etc.).

  Each of the techniques of Patent Documents 1 to 3 is considered to have a certain significance in shortening the alignment time. However, when the emitted laser light is infrared, there is room for improvement in the techniques of Patent Documents 1 to 3 as follows.

  In Patent Documents 1 and 2, the light from the light emitting element is imaged by an imaging means such as a CCD camera and used for detecting the position of the light. However, it is necessary to use an infrared camera in order to detect the position of the infrared rays with high cost. It is. Patent Document 3 proposes a completely new position detector having sensitivity to near-infrared light (paragraph [0044]). Such a position detector is designed and used exclusively for an alignment device. Manufacturing is not realistic. In addition, since infrared rays are not visible, the techniques of Patent Documents 1 to 3 are not easy to perform initial adjustment and maintenance of the alignment device as compared with the case of visible light. In addition, although the technique of patent document 4 can be said to be meaningful in the point which suppresses the shift | offset | difference of the optical axis after center alignment fixation, it does not solve said problem.

  The present invention has been made in view of such a situation, and its purpose is to shorten the alignment time when aligning the light-emitting side optical component that emits laser light in the infrared region and the light-receiving side optical component. It is an object of the present invention to provide a centering device for assembling an optical module, which can reduce costs while facilitating cost reduction and can be easily adjusted and maintained.

One aspect of the present invention is an alignment device in assembling an optical module. This alignment device
A light-emitting side optical component and a light-receiving side optical component supported so that the optical axes are parallel to each other;
First and second moving the light emitting side optical component relative to the light receiving side optical component in first and second directions perpendicular to the optical axis of the light emitting side optical component and the light receiving side optical component. Means of transportation,
A focusing screen disposed on an optical path of the light-emitting side optical component, on which light emitted from the light-emitting side optical component forms an image;
An imaging unit for imaging light imaged on the focusing screen;
Based on the two-dimensional image imaged by the imaging unit, an image processing unit that specifies first and second coordinate values of light imaged on the focusing screen by image processing;
A light intensity measuring unit connected to the output end of the optical fiber of the light receiving side optical component,
Based on the coordinate value specified by the image processing unit, the first and second moving means roughly adjust the optical axis so that the optical axes of the light-emitting side optical component and the light-receiving side optical component substantially coincide. After the rough adjustment, the light emitting side optical component and the light receiving side are adjusted by the first and second moving means based on the measurement data in the light intensity measuring unit when the light emitting side optical component is operated. An alignment device for assembling an optical module for further fine adjustment of the optical axis of the optical component,
The light-emitting side optical component emits laser light in the infrared region,
The focusing screen forms the visible laser beam in the infrared region,
The imaging unit is a visible camera.

In an alignment apparatus of an aspect,
Third moving means for moving the light emitting side optical component relative to the focusing screen in a third direction parallel to the optical axis of the light emitting side optical component and the light receiving side optical component;
A fourth moving means for moving the light emitting side optical component relative to the light receiving side optical component in the third direction;
In addition to specifying the coordinate value, the image processing unit derives the size of light imaged on the focusing screen in the two-dimensional image captured by the imaging unit,
The distance between the light emitting side optical component and the focusing screen when the light emitting side optical component and the focusing screen are relatively moved by the third moving means so that the derived size is minimized. On the basis, the distance in the third direction between the light emitting side optical component and the light receiving side optical component may be roughly adjusted by the fourth moving means.

  In this case, the distance in the third direction between the light emitting side optical component and the light receiving side optical component is calculated based on the measurement data in the light intensity measuring unit when the light emitting side optical component is operated. Further adjustment may be made by the fourth moving means.

In an alignment apparatus of an aspect,
A polarizing plate that is disposed in an optical path from the light-emitting side optical component to the focusing screen and transmits only light having a predetermined polarization plane;
A fifth moving means for rotating the light emitting side optical component about the optical axis of the light emitting side optical component;
In addition to specifying the coordinate value, the image processing unit derives the luminance of light imaged on the focusing screen in the two-dimensional image captured by the imaging unit,
The light emitting side optical component may be rotated by the fifth moving means so that the derived luminance becomes a predetermined value.

  Any combination of the above components is also effective as an aspect of the present invention.

  According to the present invention, the coordinate values in the first and second directions of the light imaged on the focusing screen by image processing based on the two-dimensional image captured by the imaging unit are specified, and the specified coordinate values are determined. Since the optical axis is roughly adjusted so that the optical axes of the light-emitting optical component and the light-receiving optical component coincide with each other, the time required for alignment is shortened compared to conventional alignment devices that do not specify coordinate values. Is done.

  In addition, while focusing on a light-emitting side optical component that emits laser light in the infrared region, a focusing screen that forms the laser light in the infrared region as a visible image is used, so there is no need to use an infrared camera. The position of the laser beam can be accurately identified from the image obtained by imaging the laser beam focused on the focusing screen with a visible camera. Therefore, the cost of the apparatus can be reduced by using a cheap visible camera as compared with the infrared camera.

  In addition, since the laser beam in the infrared region is formed as a visible image on the focusing screen, initial adjustment and maintenance are easier than in the case where the laser beam in the infrared region remains invisible.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. Further, the embodiments do not limit the invention but are exemplifications, and all features and combinations described in the embodiments are not necessarily essential to the invention.

  FIG. 1 is a schematic perspective view of an alignment apparatus 100 according to an embodiment of the present invention. In this figure, the X and Y directions perpendicular to each other in the horizontal plane exemplify the first and second directions, and the Z direction which is the vertical direction exemplifies the third direction. The alignment apparatus 100 according to the present embodiment performs alignment to align the optical axes of the light emitting side optical component 60 and the light receiving side optical component 80.

  The alignment apparatus 100 includes a base 10, a back frame 11, an XYθ table 12, a work holder 19, Z-direction guide shafts 20A and 20B, a light-receiving side support member 22, a camera-side support member 24, and a visible A camera 26, an IR sensor 28 as a focusing screen, a polarizing plate 30, a laser irradiation device 32, an image processing device 36, a power meter 42, an operation panel 44, a control unit 46, a storage unit 48, And a safety cover 54. The XYθ table 12 includes an X direction guide shaft 13, an X table 14, a Y table 16, and a θ table 18.

  The X direction guide shaft 13 is fixed to the upper surface of the base 10. The X table 14 is supported by the X direction guide shaft 13 and is movable (eg, slidable) in the X direction on the X direction guide shaft 13. The Y table 16 is supported by the X table 14, is movable in the X direction together with the X table 14, and is movable in the Y direction on the X table 14 (eg, slidable). That is, the Y table 16 is movable in the X and Y directions. The θ table 18 is supported by the Y table 16, is movable in the X and Y directions together with the Y table 16, and is rotatable on the Y table 16 about the Z direction. The work holder 19 is supported by the θ table 18, is movable in the X and Y directions together with the θ table 18, and is rotatable about the Z direction. The light-emitting side optical component 60 (work) is disposed and supported on the work holder 19 by hand supply, for example, and is movable in the X and Y directions together with the work holder 19 and is rotatable about the Z direction. In the state where the light emitting side optical component 60 is supported by the work holder 19, the optical axis and the rotation axis of the light emitting side optical component 60 coincide with each other.

  The rear frame 11 is erected vertically with respect to the upper surface of the base 10. The Z-direction guide shafts 20A and 20B are each fixed to the back frame 11. The light-receiving side support member 22 is supported by the Z-direction guide shaft 20A and is movable (eg, slidable) in the Z direction along the Z-direction guide shaft 20A. The light receiving side optical component 80 is supported by the light receiving side support member 22 and is movable in the Z direction together with the light receiving side support member 22. The camera side support member 24 is supported by the Z direction guide shaft 20B, and is movable (eg, slidable) in the Z direction along the Z direction guide shaft 20B. It is desirable to add a linear scale or the like for position measurement to the Z direction guide shaft 20B. The visible camera 26 as an imaging device, the IR sensor 28, and the polarizing plate 30 are supported by the camera-side support member 24 and are movable in the Z direction together with the camera-side support member 24. Here, the main surfaces of the IR sensor 28 and the polarizing plate 30 are horizontal, and the main surfaces are supported close to each other so that the polarizing plate 30 is closer to the light emitting side optical component 60 (lower side) than the IR sensor 28. . The IR sensor 28 is a sheet in which a powdered ET material (ET: Electron Trapping) is applied, for example, to a card. When energy is applied to the IR sensor 28 from the outside by irradiation with visible / ultraviolet light, the excited electrons (holes) are trapped in a metastable state by a trap, and this is released by infrared irradiation, which corresponds to a metastable state. The visible light of the wavelength to be emitted is emitted.

  The laser irradiation device 32 is for melting and fixing the light-emitting side optical component 60 and the light-receiving side optical component 80 after the alignment is completed, and performs so-called laser spot welding. Fixing is preferably performed at approximately three circumferential positions, and in the case of laser irradiation, laser irradiation devices 32 may be prepared at three positions (two in FIG. 1). In addition, illustration of the support means of the laser irradiation apparatus 32 is abbreviate | omitted. The image processing device 36 performs image processing on an image captured by the visible camera 26. The storage unit 48 stores coordinate information obtained as a result of image processing by the image processing device 36. The power meter 42 is connected to the output end of the optical fiber 84 of the light receiving side optical component 80 and measures the light intensity. The operation panel 44 is for the user to operate the alignment apparatus 100. The control unit 46 controls each element of the alignment apparatus 100 in an integrated manner such as controlling the operation of the XYθ table 12. Note that the light-emitting side optical component 60, the laser irradiation device 32, and the like are covered with a safety cover 54, so that laser light is prevented from going outside.

  2A and 2B are partial cross-sectional views of the light-emitting side optical component 60 and the light-receiving side optical component 80 and the vicinity thereof in the embodiment of the present invention.

  The light-emitting side optical component 60 includes an LD holder 62 (LD: laser diode), an LD chip 64, a lens 66, and a lens holder 68. The LD holder 62 is supported by being fitted to the work holder 19. The LD chip 64 is fixed to the bottom of the LD holder 62 and emits laser light in the infrared region upward in the Z direction. The LD holder 62 has a window 63 formed on the upper surface for allowing laser light from the LD chip 64 to pass therethrough. A lens holder 68 is fixed in the LD holder 62, and the lens 66 is fixedly supported on the upper side of the LD chip 64 in the Z direction by the lens holder 68. The laser light emitted from the LD chip 64 passes through the lens 66 and is condensed by traveling a predetermined distance upward in the Z direction.

  The light receiving side optical component 80 includes a receptacle 82, an optical fiber 84, and a capillary 86. The capillary 86 is accommodated and fixed in the receptacle 82, and the tip of the optical fiber 84 is inserted into the capillary 86. The receptacle 86 and the optical fiber 84 are mechanically fitted by the capillary 86.

  The work holder 19 has a mechanical alignment mechanism. For example, the technique described in Patent Document 4 can be applied to this mechanism, and only an outline will be described here. A spherical portion 21 is formed as a mechanical alignment mechanism on the bottom surface of the work holder 19, and the spherical portion 21 is rotatably accommodated in a recess 18 </ b> A on the top surface of the θ table 18. As a result, the work holder 19 and the light-emitting side optical component 60 can be rotated with the spherical portion 21 as a fulcrum. When the light receiving side optical component 80 is lowered along the Z-direction guide shaft 20A in this state, the upper surface of the LD holder 62 and the bottom surface of the receptacle 82 are in contact with each other and become parallel as shown in FIG. Here, if the rotation of the spherical portion 21 is locked by the locking mechanism 23, even if the light receiving side optical component 80 is raised and the contact between the top surface of the LD holder 62 and the bottom surface of the receptacle 82 is released, the top surface of the LD holder 62 and the receptacle 82 are released. The bottom is kept parallel.

  Hereinafter, each step of alignment will be described. 3 to 7, the illustration of the safety cover 54 in FIG. 1 is omitted.

(Step 1: Work setting)
As shown in FIG. 3, the light-emitting side optical component 60 (work) is held by the work holder 19 at Position 0. This can be done manually.

(Step 2: mating)
By moving the X table 14 to the right on the X direction guide shaft 13, the light emitting side optical component 60 is moved from Position 0 to Position 1. Then, as shown in FIG. 4, the light receiving side support member 22 is lowered along the Z-direction guide shaft 20A, and the upper surface of the light emitting side optical component 60 (the upper surface of the LD holder 62) and the bottom surface of the light receiving side optical component 80 (the bottom surface of the receptacle 82). In this state, the rotation of the spherical portion 21 is locked by the lock mechanism 23 as shown in FIG. The above-described mechanical alignment mechanism of the work holder 19 is used.

(Step 3: Provisional coordinate data acquisition)
By moving the X table 14 further to the right on the X direction guide shaft 13, the light-emitting side optical component 60 is moved from Position 1 to Position 2. Then, as shown in FIG. 5A, an image of the laser beam from the light-emitting side optical component 60 is obtained for alignment in the XYZ directions. Specifically, the light-emitting side optical component 60 is operated at Position 2 and an area including an image formed on the IR sensor 28 is captured by the visible camera 26. Based on this image (illustrated in FIG. 5B), the image processing of the image processing device 36 identifies the XY coordinate value of the image of the laser light from the light-emitting side optical component 60, and the size of the image of the laser light. (Or diameter) and luminance are derived. The camera-side support member 24 is moved up and down along the Z-direction guide shaft 20B (that is, the visible camera 26, the IR sensor 28, and the polarizing plate 30 are moved up and down), and the size (diameter) of the laser beam image is minimized. The position of the IR sensor 28 is specified as a Z coordinate value. The XYZ coordinate values specified in this way are stored in the storage unit 48 as temporary coordinate data. Further, the θ table 18 is rotated (that is, the light-emitting side optical component 60 is rotated), and the rotation angle at which the brightness of the image of the laser beam is maximized is fixed as the θ value. Note that the Z-direction position of the light-emitting side optical component 60 is determined in advance, and the Z coordinate value of the IR sensor 28 corresponds to the distance between the IR sensor 28 and the light-emitting side optical component 60 on a one-to-one basis.

(Step 4: coarse adjustment)
In step 3, the temporary coordinate data (XYZ coordinate values) acquired in Position 2 is developed into the coordinate values of the XYθ table 12 and the Z-direction guide shaft 20A in Position 1, as shown in FIG. It is only necessary to hold the θ value. At this time, first, the XY coordinate values are developed, and a cylindrical sleeve 69 is brought into contact with the upper surface of the light emitting side optical component 60 (the upper surface of the LD holder 62) as shown in FIG. The lower portion of the light receiving side optical component 80 (lower portion of the receptacle 82) is inserted as shown in FIG. 6C, and the light receiving surface of the light receiving side optical component 80 is made to coincide with the Z coordinate value of the temporary coordinate data.

(Step 5: Fine adjustment and welding)
After the coarse adjustment, the light-emitting side optical component 60 is operated to finely adjust the position of the light-receiving surface of the light-receiving side optical component 80 in the Z direction so that the measured value of the power meter 42 is maximized. When the Z direction position of the light receiving surface of the light receiving side optical component 80 is determined, the light receiving side optical component 80 (receptacle 82) and the sleeve 69 are spotted by the laser irradiation device 32 as shown in FIG. Fix by welding. Spot welding is preferably performed at equal intervals around three locations. Further, the light-emitting side optical component 60 is operated to finely adjust the position in the XY direction of the light-emitting side optical component 60 so that the measured value of the power meter 42 is maximized. When the position in the X and Y directions of the light emitting side optical component 60 is determined, the light emitting side optical component 60 (LD holder 82) and the sleeve 69 are spot welded by the laser irradiation device 32 as shown in FIG. And fix. Spot welding is preferably performed at the same time in three places at the same time, and this is performed three times, a total of nine places.

  According to the present embodiment, the following effects can be achieved.

(1) Since temporary coordinate data is acquired in step 3 described above, and coarse adjustment (step 4) is performed based on the acquired temporary coordinate data, a position where the measured value of the power meter is maximized without acquiring temporary coordinate data is searched. The alignment time can be shortened compared to

(2) Laser light in the infrared region emitted from the light-emitting side optical component 60 is pseudo-converted into visible light by the IR sensor 28 to form an image, so that the region including the imaged image can be obtained without using an infrared camera. The position of the laser beam can be accurately identified from the image captured by the visible camera 26. Therefore, it is not necessary to use an expensive infrared camera as compared with a visible camera, and the cost of the apparatus can be reduced.

(3) Further, since the laser beam in the infrared region is imaged as visible light, the initial adjustment and maintenance of the apparatus can be greatly reduced in labor compared with the case where the laser beam in the infrared region is left invisible.

  Those skilled in the art will appreciate that the above-described embodiment is an example, and that various modifications can be made to the combination of these components, and that such modifications are within the scope of the present invention. Hereinafter, modifications will be listed.

  In the embodiment, in Step 3, the rotation angle of the light receiving side optical component 80 that maximizes the luminance of the image of the laser beam is fixed as the θ value. In a modification, the θ alignment may be an external setup, and in that case, the θ table 18 is not necessary.

  In the embodiment, the light receiving side optical component 80 (receptacle 82) and the sleeve 69 are fixed, and the light emitting side optical component 60 and the sleeve 69 are fixed by spot welding using the laser irradiation device 32. In a modification, it may replace with this and may fix by adhesion | attachment or brazing.

It is a schematic perspective view of the alignment apparatus which concerns on embodiment of this invention. FIG. 3 is a partial cross-sectional view of a light-emitting side optical component, a light-receiving side optical component and the vicinity thereof in an embodiment of the present invention. It is explanatory drawing of light emission side optical component (work) installation in embodiment of this invention. It is explanatory drawing of the surface matching with the LD holder upper surface and receptacle bottom surface in embodiment of this invention. It is explanatory drawing of provisional coordinate data acquisition of the laser beam from the light emission side optical component in embodiment of this invention. It is explanatory drawing of the rough adjustment of the optical axis of the light emission side optical component and light reception side optical component in embodiment of this invention. It is explanatory drawing of welding of the light emission side optical component and light reception side optical component in embodiment of this invention. It is explanatory drawing of the alignment operation | movement by the conventional alignment apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Base 11 Back frame 12 XY (theta) table 19 Work holder 20A, 20B Z direction guide shaft 26 Visible camera 28 IR sensor 30 Polarizing plate 36 Image processing apparatus 42 Power meter 60 Light emission side optical component 80 Light reception side optical component 84 Optical fiber 100 Adjustment Core device

Claims (4)

A light-emitting side optical component and a light-receiving side optical component supported so that the optical axes are parallel to each other;
First and second moving the light emitting side optical component relative to the light receiving side optical component in first and second directions perpendicular to the optical axis of the light emitting side optical component and the light receiving side optical component. Means of transportation,
A focusing screen disposed on an optical path of the light-emitting side optical component, on which light emitted from the light-emitting side optical component forms an image;
An imaging unit for imaging light imaged on the focusing screen;
Based on the two-dimensional image imaged by the imaging unit, an image processing unit that specifies first and second coordinate values of light imaged on the focusing screen by image processing;
A light intensity measuring unit connected to the output end of the optical fiber of the light receiving side optical component,
Based on the coordinate value specified by the image processing unit, the first and second moving means roughly adjust the optical axis so that the optical axes of the light-emitting side optical component and the light-receiving side optical component substantially coincide. After the rough adjustment, the light emitting side optical component and the light receiving side are adjusted by the first and second moving means based on the measurement data in the light intensity measuring unit when the light emitting side optical component is operated. An alignment device for assembling an optical module for further fine adjustment of the optical axis of the optical component,
The light-emitting side optical component emits laser light in the infrared region,
The focusing screen forms the visible laser beam in the infrared region,
A centering device for assembling an optical module, wherein the imaging unit is a visible camera. The alignment apparatus according to claim 1,
Third moving means for moving the light emitting side optical component relative to the focusing screen in a third direction parallel to the optical axis of the light emitting side optical component and the light receiving side optical component;
A fourth moving means for moving the light emitting side optical component relative to the light receiving side optical component in the third direction;
In addition to specifying the coordinate value, the image processing unit derives the size of light imaged on the focusing screen in the two-dimensional image captured by the imaging unit,
The distance between the light emitting side optical component and the focusing screen when the light emitting side optical component and the focusing screen are relatively moved by the third moving means so that the derived size is minimized. An alignment device for assembling an optical module, characterized in that the distance in the third direction between the light emitting side optical component and the light receiving side optical component is roughly adjusted by the fourth moving means. .   The alignment apparatus according to claim 2, wherein the light emitting side optical component and the light receiving side optical component are based on measurement data in the light intensity measurement unit when the light emitting side optical component is operated. A centering device for assembling an optical module, wherein the distance in the third direction is further adjusted by the fourth moving means. In the alignment apparatus in any one of Claim 1 to 3,
A polarizing plate that is disposed in an optical path from the light-emitting side optical component to the focusing screen and transmits only light having a predetermined polarization plane;
A fifth moving means for rotating the light emitting side optical component about the optical axis of the light emitting side optical component;
In addition to specifying the coordinate value, the image processing unit derives the luminance of light imaged on the focusing screen in the two-dimensional image captured by the imaging unit,
An alignment device for assembling an optical module, wherein the light-emitting side optical component is rotated by the fifth moving means so that the derived luminance becomes a predetermined value.

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