JP4226410B2 - Imaging device - Google Patents

Description

  In particular, the present invention relates to an imaging device for use in installing a component supply cassette having two rows of component conveyance paths in an electronic component mounting apparatus.

  As shown in FIG. 8, this type of imaging apparatus 100 that has been generally used conventionally has two imaging systems, and is arranged in parallel with two CCDs 101 and 102 arranged in parallel. It has two imaging lenses 103 and 104 and reflection mirrors 105 to 108 for changing each optical path, and is configured to individually capture a part separated by a predetermined distance by each imaging system. Yes. Therefore, when setting the component supply cassette (so-called “part cassette”) 109 in the electronic component mounting apparatus, it is necessary to accurately set the two component take-out ports 110 and 111 provided in the component supply cassette 109 to the nozzle suction position. Yes, during the setting operation, the respective image pickup devices 110 and 111 are imaged by the above-described imaging device 100. Then, while adjusting the position of the component supply cassette 109 based on the imaging result, the component extraction ports 110 and 111 are moved to the nozzle suction position, and the component extraction ports 110 and 111 and the nozzle suction position are accurately determined. After alignment, the component supply cassette 109 is installed and fixed to the electronic component mounting apparatus.

The following Patent Document 1 describes an apparatus that images two optical components with one imaging means in order to adjust the relative positions of two different optical components.
Japanese Patent Application Laid-Open No. 7-261065

  However, the conventional imaging device 100 described above has the following problems. That is, in simultaneously or selectively imaging two reading parts separated by a predetermined interval, the above-described imaging apparatus 100 requires two imaging systems, which is disadvantageous in terms of cost and at the same time. There was a problem that the size was increased and the handling during work was deteriorated.

  In addition, since the apparatus described in Patent Document 1 adopts a configuration in which a prism having one total reflection surface is disposed between two optical components whose relative positions are to be adjusted, component supply having two rows of component conveyance paths is provided. It is not suitable for use in cassette installation.

  Therefore, the present invention has been made in view of such circumstances, and in particular, an object of the present invention is to provide an imaging apparatus that can be reduced in cost and size.

  In order to achieve the above object, an imaging apparatus according to the present invention is disposed on a predetermined optical axis in an imaging apparatus that captures an image of a first reading site and a second reading site that are located on substantially the same plane. Imaging means, a first reflecting member that reflects light emitted from the first reading portion toward the optical axis, and a second reflection that reflects light emitted from the second reading portion toward the optical axis. A member, a third reflecting member that is disposed in front of the imaging unit on the optical axis and reflects light reflected by the first reflecting member toward the imaging unit along the optical axis, and an imaging unit on the optical axis And the third reflection member, the light reflected by the second reflection member is reflected to the imaging means side along the optical axis, and the light reflected by the third reflection member is the optical axis. And an optical member that is transmitted to the imaging means side.

  This imaging apparatus is for imaging two reading parts located on substantially the same plane simultaneously or selectively with one imaging means. In this imaging apparatus, the light emitted from the first reading portion is reflected by the first reflecting member, then reflected by the third reflecting member, transmitted through the optical member, and received by the imaging means. . On the other hand, the light emitted from the second reading portion is reflected by the second reflecting member, then reflected by the optical member and received by the imaging means. Therefore, the two reading parts can be imaged by one imaging unit, and the third reflecting member, the optical member, and the imaging unit are arranged on the same optical axis, so that the cost of the imaging apparatus can be reduced. And size reduction can be achieved.

  The third reflecting member has a central axis substantially perpendicular to the optical path and optical axis of the light reflected by the first reflecting member, and the third reflecting member is positioned on the central axis so that the reflecting surface of the third reflecting member is located on the central axis. An attached rotating shaft, a holding member that rotatably holds the rotating shaft, a ball disposed in a groove formed in the rotating shaft, and a screw hole formed in the holding member, and rotates the rotating shaft. It is preferable to provide an adjustment screw for pressing the ball. In this way, by interposing the adjustment screw and a separate ball between the adjustment screw and the rotation shaft, the rotation shaft is dragged in a direction different from the rotation direction around the central axis as the adjustment screw rotates. Can be suppressed. Accordingly, the angle adjustment of the reflecting surface of the third reflecting member can be performed with high accuracy, and the light emitted from the first reading portion can be accurately guided to the imaging means.

  Further, a shutter that selectively blocks the first optical path between the first reading site and the first reflecting member and the second optical path between the second reading site and the second reflecting member. It is preferable to provide. With such a shutter, an image of each reading part can be taken independently. This is particularly effective when it is necessary to individually image two reading parts.

  In addition, a shutter that simultaneously opens the first optical path between the first reading site and the first reflecting member and the second optical path between the second reading site and the second reflecting member is provided. It is preferable. With such a shutter, an image of the first reading portion and the image of the second reading portion can be captured so as to overlap each other. Thereby, for example, it is possible to easily adjust the positions of the two reading parts.

  As described above, according to the present invention, the cost and size of the imaging apparatus can be reduced.

  Hereinafter, preferred embodiments of an imaging apparatus according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the imaging apparatus 1 is an electronic component mounting apparatus (not shown) in which a component supply cassette (so-called “part cassette”) 4 having two rows of component conveyance paths 2 and 3 is placed in the X-axis direction. And used when fixed on a base (not shown) movable in the Y-axis direction. In setting the parts cassette 4 in the electronic component mounting apparatus, it is necessary to accurately set the two component take-out ports 2a and 3a provided in the parts cassette 4 at the component suction position of the suction nozzle. In this setting, the image pickup apparatus 1 picks up images of the respective component take-out ports 2a and 3a, and the operator adjusts the installation position of the parts cassette 4 based on the image pickup result.

  As shown in FIGS. 1 and 2, an imaging apparatus 1 used for installing a parts cassette 4 having two rows of component conveyance paths 2 and 3 is a rectangular parallelepiped dark box that houses one CCD (imaging means) 6. It has a housing 10 composed of a portion 7 and a cylindrical tube portion 9 that accommodates one imaging lens portion 8 disposed in front of the CCD 6. The CCD 6 receives the light reflected by the first reading portion A around the first component take-out port 2a and picks up an image thereof, and at the same time, surrounds the second component take-out port 3a. The light reflected by the second reading portion B is received and the image is taken. Therefore, the imaging apparatus 1 is intended to capture two types of images simultaneously or selectively on one CCD 6.

  Further, the imaging apparatus 1 includes a plurality of LEDs (illuminating means) 11 arranged in a ring around the tip of the cylindrical portion 9. Each LED 11 is housed in a skirt portion 13 fixed to the tube portion 9 and attached to the substrate 14 in the skirt portion 13 so as to be inclined toward the reading portions A and B so as to uniformly illuminate the reading portions A and B. (See FIG. 3). Accordingly, the first and second reading portions A and B are uniformly illuminated by the respective LEDs 11, and imaging by the CCD 6 is enabled by this illumination.

  Further, because of the necessity of imaging the two reading parts A and B, the optical path P between the CCD 6 and the parts cassette 4 is changed to the first optical path P1 and the second optical path between the imaging lens unit 8 and the parts cassette 4. It is necessary to branch to the optical path P2. In view of this, the imaging device 1 employs the following configuration in the tube portion 9 between the imaging lens portion 8 and the parts cassette 4.

  That is, as shown in FIG. 4, a total reflection mirror (first reflection member) 16 is disposed above the first reading portion A. The light reflected by the first reading portion A by the total reflection mirror 16 (light emitted from the first reading portion A) is coupled to the CCD 6 so that the first optical path P1 is bent 90 degrees. Reflected to the optical axis L1 side connecting the image lens unit 8. On the other hand, a total reflection mirror (second reflection member) 17 is disposed above the second reading portion B. The light reflected by the second reading portion B by the total reflection mirror 17 (light emitted from the second reading portion B) is on the side of the optical axis L1 such that the second optical path P2 is bent 90 degrees. Reflected in. The total reflection mirror 17 is arranged at a position higher than the total reflection mirror 16 (that is, a position close to the CCD 6).

  Further, a total reflection mirror (third reflection member) 18 is disposed on the side of the total reflection mirror 16 on the optical axis L1. The total reflection mirror 18 reflects the light reflected by the total reflection mirror 16 toward the CCD 6 along the optical axis L1. A half prism (optical member) 19 is disposed on the side of the total reflection mirror 17 on the optical axis L1. The light reflected by the total reflection mirror 17 by the half mirror surface 19a of the half prism 19 is reflected toward the CCD 6 along the optical axis L1. The half prism 19 is positioned between the CCD 6 and the total reflection mirror 18 on the optical axis L1, but the light reflected by the total reflection mirror 18 is transmitted through the half mirror surface 19a of the half prism 19. Then, it proceeds to the CCD 6 side along the optical axis L1.

  With the configuration in the cylindrical portion 9 as described above, the light emitted from the first reading portion A is reflected by the total reflection mirror 16 and then reflected by the total reflection mirror 18, and the half prism 19 and the imaging lens. 8 is sequentially received by the CCD 6. On the other hand, the light emitted from the second reading portion B is reflected by the total reflection mirror 17, reflected by the half prism 19, and received by the CCD 6 through the imaging lens. Therefore, according to the imaging device 1, it is possible to image two reading parts A and B located on substantially the same plane with one CCD 6. Moreover, in the imaging device 1, the total reflection mirror 18, the half prism 19, the imaging lens 8, and the CCD 6 are disposed on the same optical axis L1. As a result, the cost and size of the imaging apparatus 1 can be reduced.

  The number of reflections when the light emitted from the first reading part A reaches the CCD 6 and the number of reflections when the light emitted from the second reading part B reaches the CCD 6 are both two. Therefore, on the CCD 6 or the monitor, the moving direction of the image on the first reading portion A side and the image on the second reading portion B side is the same direction. Therefore, the adjustment of the installation position of the parts cassette 4 is further facilitated.

  As shown in FIGS. 2 and 3, a circular first light incident window 28 through which the first optical path P1 passes and a circular first light path through which the second optical path P2 passes are provided at the tip of the cylindrical portion 9. Two light incident windows 29 are formed. A cup-shaped shutter 30 that is rotatable in the horizontal direction is fitted at the tip of the cylindrical portion 9, and the shutter 30 is appropriately rotated by a lever 31 that protrudes in the horizontal direction. A shutter window 32 is formed on the bottom surface of the shutter 30, and the first optical path P1 and the second optical path P2 are selectively or simultaneously opened by making the shutter window 32 V-shaped. .

  For example, when the shutter window 32 is disposed at the position indicated by the solid line by the turning operation of the lever 31, the first light incident window 28 and the second light incident window 29 can be opened simultaneously. As a result, the image of the first reading portion A and the image of the second reading portion B can be captured so that the positions of the reading portions A and B can be easily adjusted.

  Next, when the shutter window 32 is disposed at the position indicated by the alternate long and short dash line by rotating the lever 31, the first light incident window 28 is closed and the second light incident window 29 is opened. Become. Further, when the shutter window 32 is arranged at the position indicated by the alternate long and short dash line by the turning operation of the lever 31, the first light incident window 28 is opened and the second light incident window 29 is closed. . By such selective opening and closing, each image of the reading portions A and B can be taken independently. This can be said to be suitable when individual imaging of the two reading parts A and B is necessary.

  Here, the support structure of the total reflection mirror 18 mentioned above is demonstrated. As shown in FIGS. 5 and 6, the total reflection mirror 18 is fixed to a D-cut surface 36 a formed on one end side of the rotation shaft 36. The rotation shaft 36 is disposed so that the central axis L2 is substantially perpendicular to the first optical path P1 and the optical axis L1 bent by the total reflection mirror 16, and the reflection surface 18a of the total reflection mirror 18 is the central axis L2. Located on the top.

  The other end side of the rotating shaft 36 is inserted into a bearing hole 38 formed in a holding member 37 that forms a part of the cylindrical portion 9. Thereby, the holding member 37 will hold | maintain the rotating shaft 36 rotatably in the cantilever state. The holding member 37 is formed with a pair of screw holes 39 that extend in a direction orthogonal to the central axis L <b> 2 of the rotation shaft 36 and that has one end opened in the bearing hole 38. Each screw hole 39 is formed on the CCD 6 side and the reading parts A and B side with respect to the central axis L2, and the other end side of each screw hole 39 is in a counterbore 41 formed in the holding member 37. Is open.

  Further, an adjustment screw 42 is screwed from the counterbore 41 side into each screw hole 39 of the holding member 37. Further, a V groove (groove) 36b extending along the direction of the optical axis L1 is formed on the other end side of the rotary shaft 36, and two steel balls (balls) 43 are disposed in the V groove 36b. ing. The tip of each adjustment screw 42 is pressed against a steel ball 43 disposed in the V groove 36 b of the rotating shaft 36.

  According to the support configuration of the total reflection mirror 18 as described above, the angle of the reflection surface 18a of the total reflection mirror 18 can be adjusted by rotating the rotation shaft 36 forward or backward by gradually screwing each adjustment screw 42. At the same time, the total reflection mirror 18 can be held at the adjusted angle. In addition, since the rotation shaft 36 is held by the holding member 37 in a cantilever state, the angle adjustment can prevent the reflection surface 18a of the total reflection mirror 18 from being distorted, and the first reading portion A can be prevented. It is possible to obtain a high resolution image.

  Further, since the steel ball 43 is interposed between the adjusting screw 42 and the rotating shaft 36 separately from the adjusting screw 42, the rotating shaft 36 has a rotational direction around the central axis L2 as the adjusting screw 42 rotates. It is possible to suppress dragging in different directions. Therefore, the angle of the reflection surface 18a of the total reflection mirror 18 can be adjusted with high accuracy, and the light emitted from the first reading portion A can be accurately guided to the CCD 6. Such highly accurate angle adjustment is particularly important when imaging the first reading portion A at a high magnification.

  The present invention is not limited to the above embodiment. For example, instead of the total reflection mirror 18 of the above embodiment, a prism 46 may be applied as shown in FIG. In this case, the same space can be provided with higher rigidity than the total reflection mirror 18, so that the image of the first reading portion A can be acquired with higher resolution.

  When the prism 46 is applied, the light emitted from the first reading portion A is transmitted through the prism 46, so that the optical path length from the first reading portion A to the CCD 6 is from the second reading portion B. The optical path length to the CCD 6 is shorter than that, and the imaging position is deviated between the first reading portion A side and the second reading portion B side. Therefore, a light transmissive member 47 such as parallel glass is disposed on the second optical path P2, and the optical path length from the first reading site A to the CCD 6 and the optical path length from the second reading site B to the CCD 6 are set. It is desirable to correct so that becomes equal.

It is sectional drawing which shows one Embodiment of the imaging device which concerns on this invention. It is sectional drawing which shows the principal part of the imaging device of FIG. It is a bottom view which shows the imaging device of FIG. It is the schematic which shows the principal part of the imaging device of FIG. FIG. 2 is a partial cross-sectional plan view showing a support configuration of a total reflection mirror in the imaging apparatus of FIG. 1. It is sectional drawing along the VI-VI line of FIG. It is the schematic which shows the other form of the principal part of the imaging device of FIG. It is the schematic which shows the conventional imaging device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Imaging device, 6 ... CCD (imaging means), 16 ... Total reflection mirror (1st reflection member), 17 ... Total reflection mirror (2nd reflection member), 18 ... Total reflection mirror (3rd reflection member) ), 18a ... reflective surface, 19 ... half prism (optical member), 36 ... rotating shaft, 36b ... V groove (groove), 37 ... holding member, 39 ... screw hole, 42 ... adjusting screw, 43 ... steel ball (ball) , 46... Prism (third reflecting member), A... First reading portion, B... Second reading portion, L1... Optical axis, L2... Central axis, P1. Light path.

Claims (4)

In the imaging device that images the first reading site and the second reading site located on substantially the same plane,
An imaging means arranged on a predetermined optical axis;
A first reflecting member that reflects light emitted from the first reading portion toward the optical axis;
A second reflecting member that reflects light emitted from the second reading portion toward the optical axis;
A third reflecting member that is disposed in front of the imaging unit on the optical axis and reflects the light reflected by the first reflecting member toward the imaging unit along the optical axis;
On the optical axis, disposed between the imaging unit and the third reflecting member, and reflects the light reflected by the second reflecting member toward the imaging unit along the optical axis, and An imaging apparatus comprising: an optical member that transmits light reflected by the third reflecting member toward the imaging means along the optical axis. The third reflecting member has an optical path of light reflected by the first reflecting member and a central axis substantially orthogonal to the optical axis, and the reflecting surface of the third reflecting member is positioned on the central axis. A rotating shaft to which a reflecting member is attached;
A holding member that rotatably holds the rotating shaft;
A ball disposed in a groove formed in the rotating shaft;
The imaging apparatus according to claim 1, further comprising: an adjustment screw that is disposed in a screw hole formed in the holding member and presses the ball so as to rotate the rotation shaft. The first optical path between the first reading part and the first reflecting member and the second optical path between the second reading part and the second reflecting member are selectively blocked. The imaging apparatus according to claim 1, further comprising a shutter that performs the operation. A shutter that simultaneously opens the first optical path between the first reading portion and the first reflecting member and the second optical path between the second reading portion and the second reflecting member. The imaging apparatus according to claim 1, further comprising:

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