JP3887477B2 - Electronic component recognition device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic component recognition apparatus, and more particularly to an electronic component recognition apparatus for recognizing a state of an electronic component in advance when mounting the electronic component on a substrate.
[0002]
[Prior art]
As shown in FIG. 8, the conventional electronic component recognition apparatus 100 includes a box 101 that forms a dark box. A reading window 102 is provided on the front surface of the box 101, and an illumination light source 103 made of LEDs is fixed to the edge of the reading window 102, and the electronic component 104 is illuminated by the illumination light source 103. It is conveyed to the position of the reading window 102 by a suction nozzle (not shown). In the box 101, a half mirror 105 located behind the reading window 102 is provided. The half mirror 105 divides the optical path into two, and an imaging unit 106 is arranged on one optical path L1. A CCD area sensor 107 is disposed on the other optical path L 2, and a total reflection mirror 108 and an imaging lens 109 are sequentially arranged between the half mirror 105 and the CCD area sensor 107.
[0003]
Further, as shown in FIGS. 9 and 10, the imaging unit 106 is provided with a lens barrel 110 in which a plurality of imaging lenses 111 are arranged. The lens barrel 110 is fixed to the front end of the casing 112, The casing 112 is fixed to a stand 113 in the box 101 (see FIG. 8). The image sensor fixing plate 114 is fixed to the back surface 112 a of the casing 112 by four adjustment screws 115, and each adjustment screw 115 is screwed to the casing 112 through the through hole 114 c of the image sensor fixing plate 114. A CCD area sensor (imaging device) 117 housed in the shield case 116 is fixed at a position facing the opening 114b on the back surface 114a of the imaging device fixing plate 114. The CCD area sensor 117 is positioned on the optical axis S of the imaging lens 111 and loosens the adjustment screw 115, so that the image sensor fixing plate 114 can adjust the gap between the through hole 114c and the adjustment screw 115. To. Accordingly, it is possible to adjust the position of the CCD area sensor 117 such as the tilt with respect to the optical axis S.
[0004]
[Problems to be solved by the invention]
However, since the conventional electronic component recognition apparatus is configured as described above, the following problems exist. That is, as shown in FIG. 8, the position adjustment of the CCD area sensor 117 is performed in a state where the imaging unit 106 is incorporated in the electronic component recognition apparatus 100, and an image obtained by the CCD area sensor 117 is viewed on an external monitor. Done. In this case, since it is necessary to finely adjust the position of the CCD area sensor 117 while moving the image sensor fixing plate 114 with a finger while each adjustment screw 115 is loosened, adjustment in units of microns is extremely difficult. There was a problem that considerable skill was required.
[0005]
The present invention has been made to solve the above-described problems, and in particular, an object of the present invention is to provide an electronic component recognition device that facilitates highly accurate tilt adjustment of an image sensor.
[0006]
[Means for Solving the Problems]
An electronic component recognition apparatus according to a first aspect of the present invention illuminates an electronic component placed at a predetermined location with illumination light, and reflects reflected light from the electronic component through an imaging lens provided in a lens barrel. In the electronic component recognition apparatus for making the image incident on the image sensor and recognizing the image of the electronic component by the image sensor
An image sensor is disposed on the optical axis of the imaging lens, a cylindrical rotating member having the optical axis as a rotation center is disposed behind the lens barrel, and the image sensor is fixed to the back side of the rotating member ,
The rotating member is disposed so as to be rotatable around the optical axis in the rotating member accommodating portion provided in the casing, the rotating member is provided with a cylindrical flange portion, and the circumferential surface of the flange portion is provided with a flange portion. A pair of protrusions opposed to each other in the diameter direction are provided, and the annular front surface of the flange portion is in contact with a rotating member support surface provided in the rotating member accommodating portion as a plane perpendicular to the optical axis. A pair of adjustment screws that are parallel to the rotating member support surface and extend in a direction perpendicular to the central axis of each protrusion are screwed together, and the adjustment screws are shifted rearward from the central axis of the protrusion to adjust. The tip of the screw is brought into contact with the peripheral surface of the protrusion .
[0007]
In this electronic component recognition device, when the image sensor is incorporated into the device, it is necessary to adjust the tilt of the image sensor. In this case, just rotating the rotating member around the optical axis of the imaging lens, Together with the rotating member, the image sensor can also be rotated around the optical axis of the imaging lens, and the tilt adjustment of the image sensor can be performed very simply and reliably.
[0008]
Further, in the electronic component recognizing apparatus according to claim 1, wherein the rotating member is rotatably disposed as a rotation around the optical axis at a rotational member receiving portion provided on the casing, a cylindrical flange portion provided on the rotary member A pair of protrusions facing each other in the diameter direction of the flange portion is provided on the peripheral surface of the flange portion, and the annular front surface of the flange portion is provided in the rotating member accommodating portion as a plane perpendicular to the optical axis. contact the rotating member bearing surface has, in the casing, parallel to the rotating member supporting surface, a pair of adjustment screws extending in a direction perpendicular to the central axis of each projection portion is screwed, adjustment screws, offset rearwardly from the center axis of the protrusion, Ru is brought into contact with the tip of the adjusting screw on the peripheral surface of the protrusion.
[0009]
When such a configuration is adopted, the rotating member can be rotated by a predetermined angle around the optical axis of the imaging lens within the rotating member housing portion provided in the casing. Following this, the image sensor also rotates around the optical axis of the imaging lens. The amount of rotation is determined by the amount of rotation of the pair of adjustment screws. At this time, when one adjustment screw is fed into the casing little by little, the protrusion is pushed down by the tip of the adjustment screw, and the rotation member Rotates little by little in one direction, and fine rotation angle adjustment of the image sensor is effected. In this adjustment, the rotating member can be smoothly rotated by feeding the other adjustment screw little by little out of the casing. Furthermore, since the tip of the adjustment screw is shifted rearward from the central axis of the protrusion, it is brought into contact with the peripheral surface of the protrusion. The rotating member is rotated while being pressed against the rotating member support surface of the casing, so that the rotating member can be stably rotated and the fine adjustment thereof is ensured.
[0010]
3. The electronic component recognizing device according to claim 2, wherein the rotating member is provided with a cylindrical body portion extending forward from the flange portion, and the casing is parallel to the rotating member support surface and the center axis of the body portion. A set screw extending in a direction orthogonal to the screw is screwed, and a guide groove having a V-shaped cross section is formed in the circumferential direction on the circumferential surface of the body portion so that the conical tip of the set screw is slidably contacted. And preferred.
[0011]
When such a configuration is adopted, by tightening the set screw, the end of the set screw slides along the inclined surface of the guide groove, and as a result, the flange portion of the casing is moved forward. The rotating member is strongly pressed against the supporting surface of the rotating member, and the rotating member is firmly fixed to the casing after adjusting the rotation angle.
[0012]
4. The electronic component recognition apparatus according to claim 3, wherein the image pickup device is a CCD line sensor. When the image sensor is a CCD line sensor, it is important to align the line with the electronic component as the object to be read. When adjusting the line, it is necessary to finely adjust the rotation angle of the image sensor. The effectiveness is remarkable.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of an electronic component recognition apparatus according to the present invention will be described in detail with reference to the drawings.
[0014]
FIG. 1 is a perspective view showing an electronic component recognition apparatus according to the present invention. The electronic component recognition apparatus 1 shown in the figure has a box 2 that forms a dark box. A reading window 3 is provided on the front surface of the box 2, and an illumination light source 4 made of LEDs is fixed to the periphery of the reading window 3 in an aligned state. Therefore, the electronic components 6 conveyed to the front of the reading window 3 by the suction nozzle 5 can be illuminated by the respective illumination light sources 4. In the box 2, the imaging unit 8 is disposed on the straight light path L.
[0015]
As shown in FIGS. 2 and 3, the imaging unit 8 is provided with a lens barrel 14 in which a plurality of imaging lenses 13 are arranged in parallel at the front, and the lens barrel 14 is fixed to the front end of the casing 15. The casing 15 is fixed to a stand 16 in the box 2 (see FIG. 1). A cylindrical rotating member 17 adjacent to the lens barrel 14 is accommodated in the casing 15, and the rotating member 17 is accommodated in a rotating member accommodating portion 19 that is continuous with a lens barrel accommodating portion 18 that accommodates the lens barrel 14. At the same time, the optical axis S of the imaging lens 13 in the lens barrel 14 is rotated about the optical axis S along the wall surface in the rotating member accommodating portion 19.
[0016]
In addition, a cylindrical body portion 21 having a small diameter is provided at the front portion of the rotating member 17, and a cylindrical flange portion 20 having a large diameter is provided at the rear portion thereof. contact with the rotary member support surface 19A provided in the member accommodating portion 19, the rotary member support surface 19A is formed as a plane perpendicular to the optical axis S. Therefore, the rotating member 17 can be appropriately rotated around the optical axis S while the front surface 20a of the flange portion 20 is in contact with the rotating member support surface 19A.
[0017]
Further, a light passage portion 17b extending along the optical axis S is provided as an opening at the center of the rotating member 17. A CCD line sensor 22 as an example of an image sensor is fixed on the back surface 17a side of the rotating member 17 so as to correspond to the light passage portion 17b. The CCD line sensor 22 is housed in a shield case 23. As a result of fixing the shield case 23 to the back surface 17a of the rotating member 17 with screws or the like, the CCD line sensor 22 is connected to the back surface 17a of the rotating member 17. Fixed to the side. The light receiving elements of the CCD line sensor 22 are arranged horizontally and in a line. When the CCD line sensor 22 is fixed, the center of the light receiving element portion 22a of the CCD line sensor 22 is aligned with the optical axis S. Done. Therefore, when the rotating member 17 is rotated around the optical axis S, the light receiving element portion 22a of the CCD line sensor 22 is also rotated around the center.
[0018]
Further, as shown in FIGS. 3 and 4, the peripheral surface 20 b of the flange portion 20 is provided with a pair of protrusion portions 24 facing each other in the diameter direction of the flange portion 20, and each protrusion portion 24 has a cylindrical shape. It is formed and protrudes substantially in the horizontal direction so as to coincide with the extending direction of the light receiving element portion 22a of the CCD line sensor 22. In addition, two adjustment screws 25 are screwed into the casing 15, and each adjustment screw 25 is provided corresponding to the protrusion 24.
[0019]
As shown in FIGS. 2 and 5, each adjustment screw 25 extends in the vertical direction parallel to the rotation member support surface 19 </ b> A and orthogonal to the central axis P of the protrusion 24. The front end 25a of the protrusion 24 is shifted to the rear without being positioned directly above the central axis P of the protrusion 24, and is brought into contact with the peripheral surface 24a of the protrusion 24. Therefore, a force is always applied to the protrusion 24 in the direction of arrow A by the urging force of the tip 25a of the adjustment screw 25. As a result, as long as the tip 25a of the adjustment screw 25 continues to abut on the protrusion 24, the front surface 20a of the flange 20 continues to be pressed against the rotating member support surface 19A positioned in front of the protrusion 24 with a predetermined force. It will be. The tip 25a of the adjustment screw 25 is rounded into a hemispherical shape, and a knob portion 25b is provided on the head of the adjustment screw 25 so that the adjustment screw 25 can be easily turned with a finger.
[0020]
Here, the tilt adjustment of the CCD line sensor 22 is performed while looking at an external monitor (not shown) connected to the CCD line sensor 22 so as to match the level of the electronic component 6 conveyed to the front of the reading window 3. explain.
[0021]
In the minute rotation angle adjustment for line alignment of the CCD line sensor 22, first, while turning one knob portion 25b in one direction, the adjusting screw 25 is gradually fed into the casing 15, and at the same time the other knob portion The other adjustment screw 25 is fed out of the casing 15 little by little while rotating the same amount in the opposite direction by 25b. As a result, one protrusion 24 is pushed down by feeding the tip 25a of one adjustment screw 25, and the rotation angle of the CCD line sensor 22 is adjusted while the rotating member 17 is gradually turning in the pushing direction. .
[0022]
At this time, since the tip 25a of the adjustment screw 25 is shifted rearward from the central axis P of the protrusion 24, as long as each adjustment screw 25 is rotated, the tip 25a of the adjustment screw 25 is kept in contact with the protrusion 24. The rotating member 17 rotates little by little in one direction while the flange portion 20 is pressed against the rotating member support surface 19A of the casing 15. Therefore, when the rotation angle of the CCD line sensor 22 is adjusted, fine adjustment in units of microns is surely achieved.
[0023]
The pair of adjustment screws 25 is not limited to being threaded in the same direction, but one adjustment screw 25 is a right screw and the other adjustment screw 25 is a left screw, so that both adjustment screws 25 can be turned. The direction can also be the same. Needless to say, the amount of rotation when each knob portion 25b is rotated in a predetermined direction by a finger is determined by the pitch dimension of the thread of the adjusting screw 25.
[0024]
Here, after the line alignment of the CCD line sensor 22 is completed by the two adjusting screws 25 described above, it is necessary to firmly fix the rotating member 17 at the position.
[0025]
Therefore, as shown in FIGS. 2, 6, and 7, the casing 15 is parallel to the rotating member support surface 19 </ b> A, and the central axis K of the trunk portion 21 of the rotating member 17 (this central axis K is the optical axis). Two set screws 30 extending in a direction perpendicular to the S) are screwed, and each set screw 30 is loaded in each screw hole 29 provided in the casing 15. In the casing 15, the set screws 30 face each other in the diameter direction of the body portion 21, and a guide groove 31 having a V-shaped cross section is formed in an annular shape on the circumferential surface of the body portion 21 along the circumferential direction. . On the other hand, the distal end portion 30a of the set screw 30 is formed in a conical shape, and the distal end portion 30a is brought into contact with the inclined surface 32a far from the flange portion 20 out of the inclined surfaces 32a and 32b of the guide groove 31.
[0026]
When such a configuration is adopted, after the rotation angle adjustment of the CCD line sensor 22 is completed, each set screw 30 is tightened so that the tip 30a of the set screw 30 faces the bottom of the guide groove 31 as shown in FIG. Slide in the direction of arrow B. As a result, the body portion 21 tries to move forward in the direction of the arrow C, and the front surface 20a of the flange portion 20 is strongly pressed against the rotating member support surface 19A, so that the rotating member 17 is firmly stabilized against the casing 15 at a desired position. It will be fixed in the state.
[0027]
The present invention is not limited to the above-described embodiment, and the imaging element 22 fixed to the rotating member 17 is not limited to the CCD line sensor, but may be a CCD area sensor. When the image sensor 22 is a CCD line sensor, the line alignment with the electronic component 6 as a reading object greatly affects the reading accuracy of the image sensor 22. Therefore, the effect appears remarkably.
[0028]
【The invention's effect】
Since the electronic component recognition apparatus according to the present invention is configured as described above, the following effects are obtained. That is, an electronic component placed at a predetermined location is illuminated with illumination light, and reflected light from the electronic component is incident on an image sensor via an imaging lens provided in the lens barrel. In an electronic component recognition apparatus for recognizing an image of an electronic component,
An image sensor is disposed on the optical axis of the imaging lens, a cylindrical rotating member having the optical axis as a rotation center is disposed behind the lens barrel, and the image sensor is fixed to the back side of the rotating member ,
The rotating member is disposed so as to be rotatable around the optical axis in the rotating member accommodating portion provided in the casing, the rotating member is provided with a cylindrical flange portion, and the circumferential surface of the flange portion is provided with a flange portion. A pair of protrusions opposed to each other in the diameter direction are provided, and the annular front surface of the flange portion is in contact with a rotating member support surface provided in the rotating member accommodating portion as a plane perpendicular to the optical axis. A pair of adjustment screws that are parallel to the rotating member support surface and extend in a direction perpendicular to the central axis of each protrusion are screwed together, and the adjustment screws are shifted rearward from the central axis of the protrusion to adjust. By making the tip of the screw contact the peripheral surface of the protrusion, it is easy to adjust the inclination of the image sensor with high accuracy.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of an electronic component recognition apparatus according to the present invention.
FIG. 2 is a cross-sectional view showing a main part of the electronic component recognition apparatus shown in FIG.
FIG. 3 is a rear view of the imaging unit shown in FIG. 2;
FIG. 4 is a perspective view showing a relationship between a rotating member and an adjustment screw.
FIG. 5 is a side view showing a relationship between a protrusion provided on a rotating member and an adjustment screw.
FIG. 6 is a perspective view showing a relationship between a rotating member and a set screw.
FIG. 7 is a cross-sectional view showing the relationship between a guide groove and a set screw provided in a rotating member.
FIG. 8 is a perspective view showing a conventional electronic component recognition apparatus.
9 is a cross-sectional view showing a main part of the electronic component recognition apparatus shown in FIG.
10 is a rear view of the imaging unit shown in FIG. 9. FIG.
[Explanation of symbols]
P: central axis of the protrusion, S: optical axis, 1 ... electronic component recognition device, 6 ... electronic component, 8 ... imaging unit, 13 ... imaging lens, 14 ... lens barrel, 15 ... casing, 17 ... rotating member, 17a: Back surface of rotating member, 19: Rotating member accommodating portion, 19A: Rotating member supporting surface, 20 ... Flange portion, 20a ... Front surface of flange portion, 20b ... Peripheral surface of flange portion, 21 ... Body portion, 22 ... CCD line Sensor (imaging device), 24: protrusion, 24a ... peripheral surface of the protrusion, 25 ... adjustment screw, 30 ... set screw, 30a ... tip end of the set screw, 31 ... guide groove.

Claims (3)

An electronic component placed at a predetermined location is illuminated with illumination light, and reflected light from the electronic component is incident on an image sensor through an imaging lens provided in a lens barrel. In the electronic component recognition apparatus for recognizing the image of the electronic component,
The imaging element is disposed on the optical axis of the imaging lens, a cylindrical rotating member having the optical axis as a rotation center is disposed behind the lens barrel, and the imaging element is disposed on the back side of the rotating member. Fixed ,
The rotating member is rotatably arranged around the optical axis in a rotating member accommodating portion provided in a casing, the rotating member is provided with a cylindrical flange portion, and a circumferential surface of the flange portion is provided. A pair of protrusions facing each other in the diameter direction of the flange portion, and the annular front surface of the flange portion is a rotating member support surface provided in the rotating member accommodating portion as a plane perpendicular to the optical axis. A pair of adjustment screws extending in a direction orthogonal to the central axis of each projection are screwed onto the casing, and the adjustment screws are attached to the casing. The electronic component recognizing device is characterized in that the tip of the adjustment screw is brought into contact with the peripheral surface of the protruding portion by shifting backward from the central axis of the protruding portion . The rotating member is provided with a cylindrical body portion extending forward from the flange portion, and the casing is parallel to the rotating member support surface and orthogonal to the central axis of the body portion. And a guide groove having a V-shaped cross section for slidingly contacting the conical tip of the set screw is formed in the circumferential direction on the peripheral surface of the body portion. The electronic component recognition apparatus according to claim 1 . 3. The electronic component recognition apparatus according to claim 1, wherein the image pickup device is a CCD line sensor.

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