JP2010205785A - Method of manufacturing light-emitting module, method of manufacturing optical fiber sensor, light-emitting module, and optical fiber sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a light-emitting module that improves the sensitivity of an optical fiber sensor, and to provide a method of manufacturing the optical fiber sensor, the light-emitting module, and the optical fiber sensor. <P>SOLUTION: The method of manufacturing the light-emitting module includes: an imaging step of fitting a base portion on which a light projecting element is mounted at an operation position, and imaging the light projecting element by an imaging device, in a state that the light projecting element emits light; a determination step of determining the optical center of the light projecting element based on an image picked up in the imaging process; an adjustment step of adjusting the position of a positioning member so as to position the center of the positioning member, by which one end of an optical fiber for outside guiding the light from the light projecting element is positioned to the light projecting element, to the optical center of the light projecting element; and a fixing step of fixing the positioning member to the base portion, in a state that the center of the positioning member is positioned to the optical center of the light projecting element. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a light emitting module, a method for manufacturing an optical fiber sensor, a light emitting module, and an optical fiber sensor.

  2. Description of the Related Art Conventionally, an IC package on which an LED is mounted, a lens fixed to the surface of a translucent resin member that seals the LED, and a standing wall portion that is fixed to the IC package and to which an end of an optical fiber is connected. A projector is known (see, for example, Patent Document 1).

JP 2007-142371 (page 19, FIG. 19)

  In such a projector, when the position of the optical fiber is deviated with respect to the LED, the intensity of light incident on the core of the optical fiber becomes weak and the sensitivity of the optical fiber sensor decreases.

  The present invention has been completed based on the above circumstances, and provides a method for manufacturing a light emitting module, a method for manufacturing an optical fiber sensor, a light emitting module, and an optical fiber sensor that improve the sensitivity of the optical fiber sensor. The purpose is to do.

1st invention is the manufacturing method of a light emitting module, Comprising: The base part in which the light projection element is mounted is attached to a working position, The said light projection element is imaged with the imaging device in the state which made the light emission element light-emit An imaging step, a discrimination step for discriminating an optical center of the light projecting element based on an image captured in the image capturing process, and one end of an optical fiber for guiding light from the light projecting element to the outside. An adjustment step for adjusting the position of the positioning member so that the center of the positioning member for positioning with respect to the optical center of the light projecting element is positioned, and the center of the positioning member at the optical center of the light projecting element A fixing step of fixing the positioning member to the base portion in a positioned state.
According to the present invention, it is possible to accurately determine the optical center of the light projecting element by capturing an image in a state where the light projecting element is caused to emit light and determining the optical center of the light projecting element based on the captured image. According to the present invention, positioning is performed in a state where the center of the positioning member for positioning one end of the optical fiber that guides the light from the light projecting element to the outside is positioned at the optical center of the light projecting element. Since the member is fixed to the base portion, the optical fiber can be accurately positioned with respect to the optical center of the light projecting element.
Therefore, according to the present invention, the sensitivity of the optical fiber sensor is improved.

2nd invention is the manufacturing method of the light emitting module of 1st invention, Comprising: The calculation process of calculating the position adjustment amount of the said positioning member based on the optical center of the said light projection element on the said image, In the adjustment step, the automatic adjustment device adjusts the position of the positioning member based on the position adjustment amount.
According to this invention, since the position of the positioning member is adjusted by the automatic adjustment device, the position of the positioning member can be adjusted efficiently and more accurately.

3rd invention is a manufacturing method of the light emitting module of 2nd invention, Comprising: The optical center of the said light projection element is the light quantity gravity center of the said light projection element.
In general, since the center of light quantity of the light projecting element is stable against changes in the brightness of the light projecting element, the quality of the light emitting module is stabilized when the center of light quantity of the light projecting element is the optical center of the light projecting element.

4th invention is a manufacturing method of an optical fiber sensor provided with the element block which has a through-hole by which an optical fiber is inserted from one opening, Comprising: The manufacturing method of the light emitting module of any one of 1st-3rd invention And a press-fitting step of press-fitting the positioning member from the other opening of the through hole.
According to the present invention, since the position of the positioning member with respect to the through hole does not shift, the difficulty of fixing the optical fiber can be solved.

5th invention is a light emitting module, Comprising: The base part in which the light projection element is mounted, and the end of the optical fiber which guides the light from the said light projection element to the outside are positioned with respect to the said light projection element A positioning member, and the positioning member is adhesively fixed to the base portion in a state where the center is located at the optical center of the light projecting element.
According to this invention, even if the optical center of the light projecting element is deviated from the center of the base part, the positioning member is fixed to the base part in a state where the center of the positioning member is located at the optical center of the light projecting element. The optical fiber can be accurately positioned with respect to the optical center of the element, and as a result, the sensitivity of the optical fiber sensor is improved.

6th invention is a light emitting module of 5th invention, Comprising: The said positioning member has the press-fit hole into which the end of the said optical fiber is press-fit, and it mutually mutually has the circumferential direction in the inner peripheral wall of the said press-fit hole. Ribs that are spaced apart and extend in the axial direction are formed.
According to this invention, by providing the rib, the diameter of the press-fitting hole can be provided slightly wider than the diameter of the optical fiber, so that the optical fiber can be easily attached and detached.

7th invention is an optical fiber sensor, Comprising: The light emitting module of 5th or 6th invention, The element block in which the through-hole by which an optical fiber is inserted from one opening is formed, The said, The positioning member is press-fitted from the other opening of the through hole.
According to the present invention, since the position of the positioning member with respect to the through hole does not shift, the difficulty of fixing the optical fiber can be solved.

  According to the present invention, the sensitivity of the optical fiber sensor is improved.

The perspective view of the light emitting module which concerns on Embodiment 1 of this invention. Sectional drawing of a light emitting module. The schematic diagram which looked at the positioning member from the axial direction. The schematic diagram of an automatic adjustment apparatus. The schematic diagram which shows an example of an image. The schematic diagram which looked at the work space coordinate system from the digital camera side. The flowchart of the manufacturing process of a light emitting module. The schematic diagram of an automatic adjustment apparatus. The schematic diagram of the adjustment apparatus which concerns on Embodiment 2 of this invention. The flowchart which shows the flow of the manufacturing process of a light emitting module. Sectional drawing of the optical fiber sensor which concerns on Embodiment 3 of this invention. The schematic diagram which shows an example of the image which concerns on other embodiment of this invention.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS.
(1) Configuration of Light Emitting Module FIG. 1 is a perspective view of the light emitting module 1 before the positioning member 15 is fixed to the base portion 12. The light emitting module 1 is used as a so-called projector in a photoelectric sensor. In this embodiment, the light emitting module 1 used as a projector of an optical fiber sensor which is one of the photoelectric sensors will be described as an example.

  FIG. 2 is a cross-sectional view of the light emitting module 1 after the positioning member 15 is fixed. This section is a cross-sectional view taken along line AA shown in FIG. The light emitting module 1 includes a light projecting element 11 such as an LED or a laser diode, a base portion 12 on which the light projecting element 11 is mounted, a lens 13 that collects light emitted from the light projecting element 11, and the light projecting element 11. A positioning member 15 for positioning one end of the optical fiber 14 that guides light from the outside with respect to the light projecting element 11 is provided.

A control circuit for controlling the light projecting element 11 is resin-molded on the base portion 12, and the light projecting element 11 emits light by current supplied from the control circuit.
The lens 13 is directly formed on the base portion 12 by injection molding so that the light projecting element 11 is overmolded with a resin having transparency, for example. The separately manufactured lens 13 may be fixed to the base portion 12 with an adhesive or the like.

  The positioning member 15 is fixed to the base portion 12 with, for example, an adhesive. The positioning member 15 is formed in a cylindrical shape, and the inner peripheral wall of the cylindrical positioning member 15 constitutes a press-fitting hole 16 into which the optical fiber 14 is press-fitted.

  FIG. 3 is a schematic view of the positioning member 15 viewed from the axial direction. A point P in the figure indicates the central axis of the positioning member 15. As shown in the drawing, three ribs 17 (17a, 17b, 17c) extending in the axial direction are formed on the inner peripheral wall of the press-fitting hole 16 so as to be spaced apart from each other by 120 degrees in the circumferential direction. The diameter of the imaginary circle 18 inscribed in the radially inner surface of the three ribs 17 is configured to be smaller than the outer shape of the optical fiber 14, and the optical fiber 14 is inserted into the press-fitting hole 16 by the presence of these three ribs 17. It is press-fitted into. When the optical fiber 14 is pressed into the press-fitting hole 16, the optical axis 20 (see FIG. 2) of the optical fiber 14 and the central axis P of the positioning member 15 coincide. The number of ribs is not limited to three and can be selected as appropriate.

  Returning to FIG. 2, the upper end of the rib 17 does not reach the upper end of the positioning member 15 as shown in FIG. 2. If the upper end of the rib 17 does not reach the upper end of the positioning member 15, the optical fiber 14 can be easily inserted when inserted into the press-fitting hole 16. It becomes easy. In addition, since the optical fiber 14 may be attached to and detached from the positioning member 15, the convenience of the operator who performs the attachment / detachment work is improved when the work for press-fitting is facilitated.

A broken line 19 indicates a straight line connecting the optical center of the light projecting element 11 and the center of the lens 13, that is, the optical axis of the light emitting module 1. The optical axis of the light emitting module 1 is a straight line perpendicular to the upper surface of the base portion 12 as indicated by a broken line 19.
When the position of the positioning member 15 with respect to the light projecting element 11 is not shifted, the optical axis 19 of the light emitting module 1 and the optical axis 20 near one end fixed to the positioning member 15 in the optical fiber 14 coincide. In FIG. 2, the optical axis 19 of the light emitting module 1 and the optical axis 20 of the optical fiber 14 are shifted from each other for easy understanding.

However, if the position of the positioning member 15 with respect to the light projecting element 11 is shifted, the optical axis 19 of the light emitting module 1 and the optical axis 20 of the optical fiber 14 do not coincide with each other. If the optical axis 19 of the light emitting module 1 and the optical axis 20 of the optical fiber 14 do not coincide with each other, the intensity of light incident on the core of the optical fiber 14 becomes weak, and as a result, the sensitivity of the optical fiber sensor decreases.
Therefore, in the manufacturing process of the light emitting module 1 according to the present embodiment, the position of the positioning member 15 with respect to the light projecting element 11 is adjusted using an automatic adjustment device before the positioning member 15 is fixed to the base portion 12.

(2) Configuration of Automatic Adjustment Device FIG. 4 is a schematic diagram of the automatic adjustment device 30. The automatic adjustment device 30 includes a work table 31, a digital camera 32, a frame 33, a control unit 34, an adjustment mechanism 35, and the like.
The work table 31 is a table to which the base portion 12 is attached. The base portion 12 is attached so as not to be displaced at a predetermined work position on the work table 31.

A digital camera 32 (an example of an imaging device) is fixed above the work position by a frame 33. The digital camera 32 captures the light projecting element 11 from above the work table 31 and outputs the captured digital image to the control unit 34.
The control unit 34 includes a CPU, a ROM, a RAM, and the like. The control unit 34 analyzes the digital image output from the digital camera 32 to determine the optical center of the light projecting element 11 and controls the adjustment mechanism 35 based on the determination result. Hereinafter, determination of the optical center of the light projecting element 11 will be described.

  FIG. 5 is a schematic diagram illustrating an example of a digital image output from the digital camera 32. Since the digital image only needs to be able to determine the optical center of the light projecting element 11, it may be a so-called monochrome image having one density information for each pixel. A so-called color image having RGB three density information for each pixel may be used. The density information is information correlating with the amount of light incident on each light receiving element of the digital camera 32, and is represented by, for example, 256 gradations from 0 (black) to 255 (white). In FIG. 5, each pixel constituting the digital image is shown by a single grid. The darker the color (close to black) the greater the density information (the greater the amount of light), and the lighter the color (close to white) the darker the density. The information is small (the amount of light is small). In order to accurately discriminate the optical center, it is desirable to use a digital camera with a large number of gradations that can be expressed (so-called dynamic range is wide) and a high resolution.

The optical center of the light projecting element 11 may be the light amount peak of the digital image or the light amount centroid.
The light intensity peak is the largest density information in the digital image, in other words, the density information closest to 255.
On the other hand, the light intensity centroid is the centroid of the digital image when density information is regarded as weight.

  The coordinates at which the light intensity peak appears on the digital image are not necessarily unchanged, and may vary due to temporal changes in the brightness of the light projecting element 11 and other factors. On the other hand, since the center of gravity of the light amount is generally stable, the center of light amount is set as the optical center of the light projecting element 11 in this embodiment. When it is determined that the position where the light quantity peak appears is stable, the light quantity peak may be used as the optical center. Further, when determining the light intensity centroid, pixels that clearly do not represent the light projecting element 11 (for example, white pixels in FIG. 5) may be excluded. Specifically, for example, the light intensity centroid may be determined only for the pixels whose density information is a certain value or more.

  Returning to FIG. 4, the adjustment mechanism 35 two-dimensionally slides the hand 36 holding the positioning member 15 on the XY coordinate system perpendicular to the optical axis of the light projecting element 11 and perpendicular to the X axis and the Y axis. A three-dimensional slide mechanism (not shown) that slides in the Z-axis direction, a motor 37 that drives the three-dimensional slide mechanism, and the like are provided. In the following description, this XY coordinate system is referred to as a work space coordinate system.

  FIG. 6 is a schematic view of the work space coordinate system viewed from the digital camera 32 side. In FIG. 6, the work table 31 is omitted. Assuming that the surface of the work table 31 to which the base portion 12 is attached is a horizontal plane, the optical axis 19 of the light projecting element 11 is a vertical line perpendicular to the horizontal plane (paper surface), and therefore is a plane defined by the work space coordinate system. Is a surface parallel to the surface of the work table 31.

  Since the position of the digital camera 32 with respect to the work table 31 is fixed by the frame 33, the coordinates on the digital image have a one-to-one correspondence with the coordinates of the work space coordinate system. When the optical center of the light projecting element 11 is determined on the digital image, the coordinates of the optical center of the light projecting element 11 on the work space coordinate system can be determined by converting the coordinates into the work space coordinate system.

  The control unit 34 moves in the X-axis direction from the coordinates (X0, Y0) of the center of the current positioning member 15 on the work space and the coordinates (X1, Y1) of the optical center of the light projecting element 11 on the work space. By calculating the amount (= X1-X0) and the amount of movement in the Y-axis direction (= Y1-Y0) as the position adjustment amount and controlling the motor 37 based on the position adjustment amount, the center of the positioning member 15 is projected. The hand 36 is moved so as to be positioned at the optical center of the optical element 11. Here, “the center of the positioning member 15 is located at the optical center of the light projecting element 11” means an extension line of the central axis P when viewed from a direction perpendicular to the central axis P of the cylindrical positioning member 15. Means passing through the optical center (X1, Y1) of the light projecting element 11. The “center axis P of the positioning member 15” can be rephrased as the center axis of the substantially cylindrical press-fitting hole 16.

  As described above, since the optical fiber 14 is press-fitted and fixed to the positioning member 15 so that the optical axis 20 passes through the central axis P of the positioning member 15, the extension line of the central axis P of the positioning member 15 corresponds to the light projecting element 11. When the positioning member 15 is fixed to the base portion 12 so as to pass through the optical center, the optical axis 20 of the optical fiber 14 and the optical axis 19 of the light emitting module 1 coincide with each other, and the light incident on the core of the optical fiber 14 is aligned. The decrease in strength can be reduced.

(3) Manufacturing Process of Light Emitting Module FIG. 7 is a flowchart of the manufacturing process of the light emitting module 1.
In S <b> 101, the worker attaches the base unit 12 to the work table 31, connects a power source (not shown) to the base unit 12, and causes the light projecting element 11 to emit light.
In S102, the operator operates an operation unit (not shown) to instruct the control unit 34 to make adjustments.

In S <b> 103, the control unit 34 controls the digital camera 32 with the hand 36 removed from the work table 31 as shown in FIG. 4 to capture the light projecting element 11 and acquire the captured image from the digital camera 32. . (Imaging process).
In S104, the control unit 34 determines the light intensity centroid of the light projecting element 11 on the digital image based on the digital image. (Determination process)

In S <b> 105, the control unit 34 calculates the position adjustment amount of the positioning member 15 based on the light amount gravity center of the light projecting element 11 on the digital image. (Calculation process)
In S106, the control unit 34 moves the hand 36 based on the position adjustment amount as shown in FIG. As a result, the center of the positioning member 15 is positioned at the optical center of the light projecting element 11. (Adjustment process)

In S <b> 107, for example, the operator applies an adhesive to the lower end surface of the positioning member 15, and then operates the operation unit to instruct the lowering of the positioning member 15. (Fixing process)
In S108, the control unit 34 controls the three-dimensional slide mechanism to lower the positioning member 15. As a result, the positioning member 15 is bonded and fixed to the base portion 12. (Fixing process)

(4) Effects of Embodiment According to the method for manufacturing the light emitting module 1 according to Embodiment 1 of the present invention described above, the light projecting element 11 is imaged in a state where the light projecting element 11 is caused to emit light, and the light projecting element 11 is based on the captured image. By determining the optical center, it is possible to accurately determine the optical center of the light projecting element 11. According to this manufacturing method, the center of the positioning member 15 for positioning one end of the optical fiber 14 that guides the light from the light projecting element 11 to the outside is the optical center of the light projecting element 11. Since the positioning member 15 is fixed to the base portion 12 in the state of being positioned at, the optical fiber 14 can be accurately positioned with respect to the optical center of the light projecting element 11.
Therefore, according to the method for manufacturing the light emitting module 1, the sensitivity of the optical fiber sensor is improved.

  Furthermore, according to this manufacturing method, since the position of the positioning member 15 is adjusted by the automatic adjustment device 30, the position of the positioning member 15 can be adjusted efficiently and accurately.

  Furthermore, according to this manufacturing method, the optical center of the light projecting element 11 is the center of light quantity of the light projecting element 11. In general, the light intensity centroid of the light projecting element 11 is stable against changes in the luminance of the light projecting element 11. Therefore, if the light intensity centroid of the light projecting element 11 is the optical center of the light projecting element 11, the quality of the light emitting module 1 Stabilize.

  Further, according to the light emitting module 1 according to Embodiment 1 of the present invention, the center of the positioning member 15 is positioned at the optical center of the light projecting element 11 even if the optical center of the light projecting element 11 is deviated from the center of the base portion 12. Since the positioning member 15 is fixed to the base portion 12 in such a state, the optical fiber 14 can be accurately positioned with respect to the optical center of the light projecting element 11, and as a result, the sensitivity of the optical fiber sensor is improved.

  Furthermore, according to the light emitting module 1, the rib 17 is provided on the inner peripheral wall of the press-fitting hole 16 so that the diameter of the press-fitting hole 16 can be slightly wider than the diameter of the optical fiber 14. It can be carried out.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the operator adjusts the position of the positioning member 15.
FIG. 9 is a schematic diagram of the adjusting device according to the second embodiment. The adjustment device 40 includes a work table 31, a digital camera 32, a frame 33, an adjustment mechanism 41, and the like. Since the work table 31, the digital camera 32, and the frame 33 are substantially the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  The adjustment mechanism 41 includes the hand 36 according to the first embodiment and the three-dimensional slide mechanism, but does not include the control unit 34 and the motor 37. Instead, in the second embodiment, a display device 42 such as a CRT (Cathode Ray Tube) or LCD (Liquid Crystal Display) for displaying a moving image taken by the digital camera 32 is provided, and the three-dimensional slide mechanism has a work. A handle or the like (not shown) for manually moving the hand 36 is provided.

FIG. 10 is a flowchart showing the flow of the manufacturing process of the light emitting module 1.
In S <b> 201, the worker attaches the base unit 12 to the work table 31 and connects a power source (not shown) to the base unit 12 to cause the light projecting element 11 to emit light.

In S202, the operator operates an operation unit (not shown) to start imaging with the digital camera 32.
In S203, the operator refers to the moving image displayed on the display device 42 to determine the optical center of the light projecting element 11, and operates the three-dimensional slide mechanism so that the center of the positioning member 15 is the optical of the light projecting element 11. The positioning member 15 is moved so as to be positioned at the center.

In S <b> 204, for example, the operator applies an adhesive to the lower end surface of the positioning member 15.
In S205, the operator operates the three-dimensional slide mechanism to lower the positioning member 15. As a result, the positioning member 15 is bonded and fixed to the base portion 12.

According to the method for manufacturing the light emitting module according to the second embodiment of the present invention described above, an image is displayed on the display device 42, and the operator refers to the image displayed on the display device 42 to determine the position of the positioning member 15. Therefore, the position of the positioning member 15 can be adjusted with a simple configuration.
The second embodiment is substantially the same as the first embodiment in other points.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIG.
FIG. 11 is a cross-sectional view of the optical fiber sensor 50 according to the third embodiment. Here, the upper side of FIG. 11 will be described as the front side, and the lower side of FIG. 11 will be described as the rear side.
The optical fiber sensor 50 accommodates the light emitting module 1 and the light receiving module 130 on the rear side of the element block 51 made of synthetic resin, and the light emitting side optical fiber corresponding to the light emitting module 1 on the front side of the element block 51. 14, the light receiving side optical fiber 131 is attached corresponding to the light receiving module 130.

  The specific configuration of the optical fiber sensor 50 will be described. The element block 51 has a vertically long block shape, and the rear center protrudes rearward. A first accommodating portion 132 that opens to the rear surface side of the element block 51 is recessed in the protruding portion, and the light emitting module 1 is accommodated therein with the light projecting surface facing forward.

  The first housing part 132 includes a fixing part 133 that holds the positioning member 15 of the light emitting module 1 and a housing part 134 that houses the base part 12, and has a step shape as a whole. The fixing part 133 corresponds to the positioning member 15 of the light emitting module 1, and the size thereof is made slightly smaller than the outer shape of the positioning member 15. On the other hand, the accommodating portion 134 corresponds to the base portion 12 of the light emitting module 1, and the size thereof is made larger than the outer shape of the base portion 12. The shape of the accommodating portion 134 is a square shape, and the four inner wall surfaces of the accommodating portion 134 are all flat processed.

As shown in FIG. 11, when the light emitting module 1 is inserted into the first housing part 132 from the rear (press-fitting process), the outer peripheral surface of the positioning member 15 of the light emitting module 1 is entirely against the inner peripheral surface of the fixed part 133. It is the structure which fits without a gap over the periphery.
The first housing portion 132 is provided with a fiber insertion hole 135 (an example of a through hole). The fiber insertion hole 135 extends horizontally toward the front and opens forward through the front wall of the element block 51. The light projecting side optical fiber 14 is inserted into the fiber insertion hole 135 from the front side. The hole diameter of the fiber insertion hole 135 and the fiber diameter of the light projecting side optical fiber 14 are set to be substantially the same, and the axis L of the light projecting side optical fiber 14 inserted is at the hole center position of the fiber insertion hole 135. The settings are almost the same. Note that the hole center position of the fiber insertion hole 135 coincides with the center of the first housing portion 132 in this embodiment. The distal end portion of the light projecting side optical fiber 14 inserted through the fiber insertion hole 135 is press-fitted into the positioning member 15 of the light emitting module 1.

  In addition, a second housing portion 140 is provided at the rear portion of the element block 51 and on the left side of the first housing portion 132. The second accommodating portion 140 has a stepped shape like the first accommodating portion 132 and has a rear surface opened. The light receiving module 130 is accommodated in the state where the light receiving surface faces forward. A fiber insertion hole 141 through which the light receiving side optical fiber 131 can be inserted also extends from the center of the front wall of the second housing portion 140 in the same manner as the first housing portion 132. The fiber insertion hole 141 is formed to penetrate the front wall of the element block 51 and open forward, and the light receiving side optical fiber 131 is inserted from the front side.

  In the optical fiber sensor 50 configured as described above, when the light emitting module 1 is driven to emit detection light, the light passes through the light projecting side optical fiber 14 and is guided to a detection target (not shown). The light is emitted from the fiber tip toward a detection target (not shown). Then, the reflected light reflected by the detection object is guided to the light receiving module 130 through the light receiving side optical fiber 131 and enters the light receiving module 130 after exiting the fiber tip. From the above, it is possible to detect the presence or absence of a detection target based on the level of received light.

  According to the manufacturing method of the optical fiber sensor and the optical fiber sensor 50 according to the third embodiment of the present invention described above, the position of the positioning member 15 with respect to the through hole 135 does not shift. The difficulty of fixing the optical fiber 14 due to can be solved.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

(1) Although the case where the optical fiber 14 is press-fitted and fixed to the positioning member 15 has been described as an example in the above embodiment, the optical fiber 14 may be fixed to the positioning member 15 by a method other than press-fitting and fixing.

(2) Although the case where the positioning member 15 is fixed to the base portion 12 with an adhesive has been described as an example in the above embodiment, the positioning member 15 may be fixed by other methods such as a double-sided tape.

(3) In the above embodiment, the light projecting element 11 is directly imaged by the digital camera 32 fixed above the work table 31, but the positioning member 15 to which one end of the optical fiber 14 is fixed is used by the hand 36. 11, and the other end of the optical fiber 14 may be connected to the digital camera 32 to image the light projecting element 11 via the optical fiber 14.

(4) In the above embodiment, the center of light quantity and the peak of light quantity of the digital image have been described as an example of the optical center of the light projecting element 11, but the optical center may be determined as follows.
For example, the above-mentioned digital image is divided into blocks of vertical 7 pixels × horizontal 7 pixels, and the total value of the density information of each pixel belonging to one block is set as the total light amount of the block, and the block having the largest total light amount The center pixel may be the optical center. In the case of the digital image shown in FIG. 5, when it is divided into blocks of 7 × 7 pixels, it is divided into 9 blocks in total, 3 vertical blocks and 3 horizontal blocks. The size of the block is not limited to 7 × 7 pixels, and can be selected as appropriate.
Further, for example, as shown in FIG. 12, a digital image may be scanned by a window 150 of 7 pixels × 7 pixels, and the center pixel of the window 150 at the position where the total light amount of the window 150 is the largest may be used as the optical center. A curve 151 in the figure indicates a trajectory followed by the center of the window 150.

DESCRIPTION OF SYMBOLS 1 ... Light emitting module 11 ... Projection element 12 ... Base part 14 ... Optical fiber 15 ... Positioning member 16 ... Press-fit hole 17 ... Rib 30 ... Automatic adjustment apparatus 32 ... Digital cameras (imaging devices)
42 ... Display device 50 ... Optical fiber sensor 51 ... Element block 135 ... Fiber insertion hole (through hole)

Claims (7)

An imaging step of attaching the base portion on which the light projecting element is mounted to a work position and imaging the light projecting element with an imaging device in a state where the light projecting element emits light;
A determination step of determining the optical center of the light projecting element based on the image captured in the imaging step;
The position of the positioning member is such that the center of the positioning member for positioning one end of the optical fiber for guiding light from the light projecting element to the outside with respect to the light projecting element is located at the optical center of the light projecting element. An adjustment process for adjusting
A fixing step of fixing the positioning member to the base portion in a state where the center of the positioning member is positioned at the optical center of the light projecting element;
Manufacturing method of light emitting module containing. It is a manufacturing method of the light emitting module according to claim 1,
A calculation step of calculating a position adjustment amount of the positioning member based on an optical center of the light projecting element on the image;
In the adjustment step, the automatic adjustment device adjusts the position of the positioning member based on the position adjustment amount. It is a manufacturing method of the light emitting module according to claim 2,
The light emitting module manufacturing method, wherein the optical center of the light projecting element is a light intensity center of the light projecting element. A method of manufacturing an optical fiber sensor including an element block having a through hole into which an optical fiber is inserted from one opening,
A manufacturing method of the light emitting module according to any one of claims 1 to 3,
A press-fitting step of press-fitting the positioning member from the other opening of the through hole;
An optical fiber sensor manufacturing method including: A base portion on which a light emitting element is mounted;
A positioning member for positioning one end of an optical fiber for guiding light from the light projecting element to the outside with respect to the light projecting element;
And the positioning member is bonded and fixed to the base portion in a state where the center thereof is located at the optical center of the light projecting element. The light emitting module according to claim 5,
The positioning member has a press-fitting hole into which one end of the optical fiber is press-fitted,
A light emitting module, wherein ribs extending in the axial direction and spaced apart from each other in the circumferential direction are formed on an inner peripheral wall of the press-fitting hole. The light emitting module according to claim 5 or 6,
An element block in which a through hole into which an optical fiber is inserted from one opening is formed;
An optical fiber sensor in which the positioning member is press-fitted from the other opening of the through hole.

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