JP2015153432A - Method for manufacturing optical unit and adjustment device of optical unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the adjustment of a relative position between a light-emitting member and a collimator lens.SOLUTION: A method for manufacturing an optical unit 90 which includes a light-emitting member 91 having a light-emitting part 911 and a collimator lens 92 for making light emitted from the light-emitting member 91 parallel light includes a first step of adjusting the relative position between the light-emitting member 91 and the collimator lens 92, so that the center of gravity of the quantity of the light transmitted through the collimator lens 92, measured by center-of-gravity measurement means 10 becomes a predetermined position, and a second step of adjusting the relative position between the light-emitting member 91 and the collimator lens 92, so that the contour of the light transmitted through the collimator lens 92, imaged by imaging means 20 becomes a predetermined contour, after the first process.

Description

  The present invention relates to a method of manufacturing an optical unit including a light emitting member and a collimating lens that collimates light emitted from the light emitting member, and an adjustment device that adjusts the relative position of the light emitting member and the collimating lens.

  Various methods for adjusting the relative positions of the light emitting member and the collimating lens have been proposed (see, for example, Patent Document 1 below). As an example thereof, there is a technique in which an image capturing means such as a CCD captures an outline of light transmitted through the collimating lens and adjusts the relative position between the light emitting member and the collimating lens so that the contour has a predetermined shape.

JP 2006-23626 A

  In the adjustment method using such an image pickup means, when the relative position of the light emitting member and the collimating lens at the initial setting is largely deviated from the correct position, no image of light is reflected on the image pickup means. Edges cannot be recognized and adjustment takes time. A measure to increase the imageable range of the imaging means is also conceivable, but this causes a problem because the accuracy of adjustment is reduced due to a decrease in resolution. In addition, there may be a measure to install the imaging means close to the collimating lens so that the edge of the light is reflected. However, there is a limit in bringing both together due to device limitations.

  An object of this invention is to make easy adjustment of the relative position of a light emitting member and a collimating lens.

  In order to solve the above problems, a method for manufacturing an optical unit according to the present invention is a method for manufacturing an optical unit including a light-emitting member having a light-emitting portion and a collimating lens that collimates light emitted from the light-emitting member. The first step of adjusting the relative position of the light emitting member and the collimating lens so that the center of gravity of the amount of light transmitted through the collimating lens measured by the center of gravity measuring means is a predetermined position, and the first step And a second step of adjusting the relative position of the light emitting member and the collimating lens so that the contour of the light transmitted through the collimating lens imaged by the imaging means becomes a predetermined contour. To do.

  The second step is a step of adjusting the relative position of the light emitting member and the collimating lens so that the contours of light that is transmitted through the collimating lens and imaged at different positions by a plurality of imaging means are the same contour. There should be.

  An adjusting device for an optical unit according to the present invention is an adjusting device that adjusts a relative position between a light emitting member having a light emitting portion and a collimating lens that collimates light emitted from the light emitting member, the collimating lens Centroid measuring means for measuring the centroid of the amount of light that has passed through and imaging means for taking an image of the light that has passed through the collimating lens.

  It is preferable to include a plurality of the imaging units that capture images of light transmitted through the collimating lens at different positions.

  According to the present invention, the light emitting member and the collimating lens can be roughly aligned by adjusting the center of gravity of the amount of light transmitted through the collimating lens to a predetermined position by the center of gravity measuring means. After such rough alignment, the contour (edge) of the light transmitted through the collimating lens can be easily specified by the imaging means, so adjustment of the relative position of the light emitting member and the collimating lens (manufacture of the optical unit) is possible. It becomes easy.

  If light is imaged at different positions by a plurality of imaging means and the parallel light is realized by making the contour of the light the same contour, adjustment of the relative position of the light emitting member and the collimating lens (optical (Manufacture of units) can be performed easily and accurately.

It is the figure which showed typically the adjustment apparatus of the optical unit concerning one Embodiment of this invention. It is a figure for demonstrating the 1st process (process using a gravity center measuring means) of the manufacturing method of an optical unit, Comprising: (a) is a state where the gravity center of light quantity does not exist in a spot center, (b) is light quantity. It shows a state where the center of gravity does not exist at the center of the spot. It is a figure for demonstrating the 2nd process (process using an imaging means) of the manufacturing method of an optical unit, Comprising: (a) is imaged with the outline of the light imaged with a 1st imaging means, and a 2nd imaging means. (B) shows a state where the contour of the light imaged by the first imaging means and the contour of the light imaged by the second imaging means match.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. An optical unit adjusting apparatus 1 according to an embodiment of the present invention shown in FIG. 1 includes a relative position adjusting unit 40, a center-of-gravity measuring unit 10, and an imaging unit 20.

  The optical unit 90 that is an adjustment target includes a light emitting member 91 and a collimating lens 92. An example of the light emitting member 91 is a light emitting element that emits light such as a laser diode. Moreover, the member which radiate | emits the transmitted light like an optical fiber from an end surface may be sufficient. That is, any device having the light emitting unit 911 may be used. The collimator lens 92 collimates the divergent light emitted from the light emitting unit 911 of the light emitting member 91. If the relative positional relationship between the light emitting member 91 and the collimating lens 92 is a predetermined relationship, the light incident on the collimating lens 92 is collimated (hereinafter, the light transmitted through the collimating lens 92 is collimated). The relative position is expressed as “correct” and the relative position when it is not collimated is expressed as “incorrect”).

  The relative position adjusting unit 40 is a unit that can arbitrarily adjust the relative position of the light emitting member 91 and the collimating lens 92. One of the light emitting member 91 and the collimating lens 92 may be fixed and a mechanism capable of adjusting the position and inclination of the other may be provided, or the position and inclination of the light emitting member 91 may be changed as shown in FIG. The light emitting member adjusting mechanism 41 that can be adjusted and the lens adjusting mechanism 42 that can change the position and inclination of the collimating lens 92 may be provided. Since the specific configuration of the relative position adjusting means 40 (light emitting member adjusting mechanism 41, lens adjusting mechanism 42) is not limited to a specific one, detailed description thereof will be omitted.

  The center-of-gravity measuring unit 10 is a unit that can measure the center of gravity of the amount of light transmitted through the collimating lens 92. As the center-of-gravity measuring means 10, for example, an optical position sensor (PSD) can be applied. In the present embodiment, the light transmitted through the collimating lens 92 reaches the first half mirror 31 provided on the collimating lens 92 side, and the light reflected by the first half mirror 31 enters the barycentric measurement means 10. become.

  The imaging unit 20 is a unit that can project an image (outline) of light that has passed through the collimating lens 92. As the imaging unit 20, for example, a CCD camera can be applied. The adjusting device 1 according to the present embodiment includes two image capturing units 20 (a first image capturing unit 21 and a second image capturing unit 22). In the present embodiment, the light transmitted through the collimator lens 92 and the first half mirror 31 reaches the second half mirror 32, and the light reflected by the second half mirror 32 is displayed on the first imaging means 21. The light transmitted through the second half mirror 32 reaches a total reflection mirror 33 (may be a half mirror), and the light reflected by the total reflection mirror 33 is displayed on the second imaging means 22. As described above, the positions at which the first imaging unit 21 and the second imaging unit 22 capture the light transmitted through the collimator lens 92 are different. Therefore, when the light transmitted through the collimator lens 92 is parallel light, the contours of the light imaged by both the imaging means 21 and 22 are exactly the same.

  A method for manufacturing the optical unit 90 using the adjusting device 1 (method for adjusting the relative position of the light emitting member 91 and the collimating lens 92) is as follows. First, the light emitting member 91 and the collimating lens 92 are set on the relative position adjusting unit 40, and light is emitted from the light emitting unit 911 of the light emitting member 91.

  When the optical axes of the light emitting member 91 and the collimating lens 92 are shifted, the center of gravity C of the amount of light measured by the center of gravity measuring means 10 that has passed through the collimating lens 92 as shown in FIG. There is no state (the peak value of the normal distribution of light quantity does not exist in the center). Accordingly, in the first step, the relative position adjusting means 40 is operated to change the position of at least one of the light emitting member 91 and the collimating lens 92, so that the center of gravity of the amount of light as shown in FIG. Both relative positions are adjusted so that C is located at the center of the spot.

  Even if the optical axes of the light emitting member 91 and the collimating lens 92 coincide with each other, if the distance between the light emitting member 91 and the collimating lens 92 is not correct, the light transmitted through the collimating lens 92 becomes diverging light or focused light. In such a case, as shown in FIG. 3A, the contour of the light imaged by the first imaging means 21 and the contour of the light imaged by the second imaging means 22 are different. Therefore, in the second step, by operating the relative position adjusting means 40 and changing the position of at least one of the light emitting member 91 and the collimating lens 92, both the imaging means 21, as shown in FIG. The relative positions of the two images are adjusted so that the contour of the light imaged by the image 22 matches (the shape of the image becomes the predetermined shape F). Specifically, the relative position of both is adjusted so that the center coordinate of the image of light coincides with the edge of the image.

  After the second step, the light emitting member 91 and the collimating lens 92 are assembled to other members constituting the optical unit 90 while fixing the relative position. For example, in the case of the optical unit 90 in which both the light emitting member 91 and the collimating lens 92 (including the optical member) are fixed to the substrate, the light emitting member 91 and the collimating lens 92 are both fixed to the substrate, so that The optical unit 90 having the correct position can be obtained.

  According to the optical unit adjusting apparatus 1 (the manufacturing method of the optical unit 90) according to the present embodiment described above, the center of gravity of the light transmitted through the collimator lens 92 is adjusted by the centroid measuring means 10 to a predetermined position. As a result, the light emitting member 91 and the collimating lens 92 can be roughly aligned. After such rough alignment, the contour of the light transmitted through the collimating lens 92 by the imaging unit 20 (edge) is almost eliminated since the light contour is hardly shifted from a correct position that cannot be specified by the imaging unit 20. ) Can be easily identified. Therefore, adjustment of the relative position of the light emitting member 91 and the collimating lens 92 (manufacture of the optical unit 90) is facilitated.

  Further, as in the present embodiment, if a method is adopted in which light is imaged at different positions by the two imaging units 20 and the parallel light is realized by the same contour of the light, the light emitting member Adjustment of the relative position of 91 and the collimating lens 92 (manufacture of the optical unit 90) can be performed easily and accurately. In addition, it is good also as a structure which uses three or more image pickup means 20, and adjusts so that the outline of the light imaged by each image pickup means 20 may correspond.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said embodiment at all, A various change is possible in the range which does not deviate from the summary of this invention.

  In the optical unit adjusting apparatus 1 (manufacturing method of the optical unit 90) according to the above-described embodiment, it has been described that a plurality of imaging units 20 are used. For example, in the case of an apparatus that can accurately determine the mounting position of one of the light emitting member 91 and the collimating lens 92 during adjustment, when the other position is adjusted and the relative position between the two is correct, The contour (center coordinates and edge) of the image captured by the imaging means 20 must be a predetermined contour. Therefore, the second imaging process may be performed by the single imaging unit 20.

DESCRIPTION OF SYMBOLS 1 Optical unit adjustment apparatus 10 Center-of-gravity measurement means 20 Imaging means 21 First imaging means 22 Second imaging means 90 Optical unit 91 Light emitting member 911 Light emitting part 92 Collimating lens

Claims (4)

A method of manufacturing an optical unit comprising a light emitting member having a light emitting portion, and a collimating lens for collimating light emitted from the light emitting member,
A first step of adjusting the relative position of the light emitting member and the collimating lens so that the center of gravity of the amount of light transmitted through the collimating lens measured by the center of gravity measuring means is a predetermined position;
After this first step, a second step of adjusting the relative position of the light emitting member and the collimating lens so that the contour of the light transmitted through the collimating lens imaged by the imaging means becomes a predetermined contour;
The manufacturing method of the optical unit characterized by including.   The second step is a step of adjusting the relative position of the light emitting member and the collimating lens so that the contours of light that is transmitted through the collimating lens and imaged at different positions by a plurality of imaging means are the same contour. The method of manufacturing an optical unit according to claim 1, wherein An adjusting device that adjusts the relative position between a light emitting member having a light emitting portion and a collimating lens that collimates light emitted from the light emitting member,
Centroid measuring means for measuring the centroid of the amount of light transmitted through the collimator lens;
Imaging means for capturing an image of light transmitted through the collimating lens;
A device for adjusting an optical unit, comprising:   The optical unit adjustment apparatus according to claim 3, further comprising a plurality of the imaging units that capture images of light transmitted through the collimating lens at different positions.

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