JP3822971B2 - 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 the electronic component is mounted on a substrate.
[0002]
[Prior art]
As shown in FIG. 8, the conventional electronic component recognition apparatus 100 includes a small-field main body C and a large-field main body D. The small-field main body C is an image sensor unit 101 in which an image sensor 103 made of a CCD is incorporated. The large-field main body D has an image sensor unit 102 in which an image sensor 104 made of a CCD is incorporated. The image sensor units 101 and 102 are respectively fixed to lens barrels 107 and 108 arranged at right angles to the housing H, and imaging lenses 105 and 106 are provided in the lens barrels 107 and 108, respectively. . Also, an illumination light source 110 that irradiates light toward the bottom surface of the electronic component P conveyed to the imaging position by the suction nozzle 109 is disposed at the end of the housing H. In the housing H, a total reflection mirror 111 for bending the optical path of the reflected light from the electronic component P by 90 ° is provided. Further, in the housing H, a half mirror prism 112 is disposed between the total reflection mirror 111 and the imaging lens 105, and a total reflection mirror 113 is disposed between the half mirror prism 112 and the imaging lens 106. ing.
[0003]
Here, as shown in FIG. 9, a fixed sleeve 114 is screwed to the lens barrel 107 via a screw coupling portion M <b> 1, and a flange 115 is formed on the upper end of the sleeve 114. In addition, a movable sleeve 116 is screwed to the opening end of the image pickup device unit 101 via a screw coupling portion M2, and a flange accommodating portion 117 that surrounds the flange 115 is provided at the end portion of the sleeve 116. It has been. That is, the sleeve 114 is screwed to the lens barrel 107 and the sleeve 116 is screwed to the image sensor unit 101, but the flange accommodating portion 117 has a degree of freedom in the radial direction and the rotational direction with respect to the flange 115. In this configuration, it can be freely moved in a plane perpendicular to the optical axis L. This configuration is used for alignment adjustment between the optical axis L in the lens barrel 107 and the center of the image sensor 103. Further, the flange accommodating portion 117 is provided with a plurality of screw holes 118, and adjustment screws 119 are screwed into the respective screw holes 118. Therefore, after the image sensor unit 101 is moved in the horizontal direction, the optical axis L and the image sensor 103 are aligned, and then the adjustment screw 119 is tightened to finely adjust the alignment.
[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.
[0005]
That is, as shown in FIG. 10, the screw hole 118 is provided in the flange housing portion 117 with an index angle of 45 °. As a result of rotating the flange housing portion 117 when adjusting the position of the image sensor 103. The screw hole 118 also rotates together, and it is extremely difficult to predict where the screw hole 118 will finally be because of its structure. Therefore, when the screw hole 118 on the side close to the large visual field main body D is blocked by the large visual field main body D and cannot be used, there is a situation in which the adjustment screw 119 cannot be uniformly tightened by a tool such as a screwdriver. In addition, it becomes difficult to finely adjust the alignment of the image pickup device on the order of microns. In particular, the closer the small visual field main body C and the large visual field main body D are, the more problematic. In order to solve such a problem, it is conceivable that the small-field main body C and the large-field main body D are largely separated from each other, but there is a problem that the apparatus itself is increased in size.
[0006]
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 apparatus that reliably adjusts the position of an image sensor.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided an electronic component recognizing device that illuminates an electronic component placed at a predetermined location with illumination light, and uses an imaging lens provided in a lens barrel to reflect light from the electronic component. In an electronic component recognition apparatus for making an image incident on an image sensor in the image sensor unit and recognizing an image of the electronic component by the image sensor, a cylinder that is provided on the opening end side of the image sensor unit and projects outward A flange-shaped flange, a flange housing portion provided on the opening end side of the lens barrel and having an inner wall surface surrounding the outer surface of the flange from the outside, and extending perpendicularly to the optical axis in the lens barrel and of the flange housing portion A screw hole that penetrates from the outer wall surface to the inner peripheral surface of the inner wall surface, and an adjustment screw that is screwed into the screw hole so that the tip contacts the peripheral end surface of the outer surface of the flange. And franc Between the housing part inner peripheral surface of, and wherein a gap is provided over the entire circumference.
[0008]
In this electronic component recognition apparatus, the flange and the flange housing portion move relative to each other through a gap, but as a result of providing the flange housing portion on the lens barrel side and the flange on the image sensor unit side, the flange housing portion is fixed. The flange becomes the movable side. Therefore, when the image sensor in the image sensor unit is aligned and adjusted with respect to the optical axis in the lens barrel, the position of the image sensor is adjusted while moving the flange in the radial direction in the flange housing portion. Further, the angle adjustment of the image sensor is adjusted while rotating the flange. Even in such an adjustment, the screw hole always keeps the desired position without following the rotation of the flange, and an unexpected situation in which the operator deviates from the initial position set in advance by the operator does not occur. Absent. Therefore, the adjustment screw can be surely screwed into the initially planned screw hole, and the fine adjustment in the micron order intended by the operator is ensured.
[0009]
3. The electronic component recognition apparatus according to claim 2, wherein the flange is provided on a cylindrical inner sleeve joined to the image pickup device unit via a screw coupling portion, and the flange housing portion is provided on the lens barrel via the screw coupling portion. It is preferable to be provided on a joined cylindrical outer sleeve. In this way, by incorporating the inner sleeve and outer sleeve between the lens barrel and the imaging device unit, the degree of freedom of assembly and design increases, and at the same time, the screwing amount of the outer sleeve to the lens barrel can be adjusted, This makes it easy to adjust the focus while changing the distance between the imaging element and the imaging lens.
[0010]
In the electronic component recognizing device according to claim 3, it is preferable that a protrusion for contacting the tip of the adjusting screw is formed at the center of the peripheral end surface of the flange so as to protrude over the entire periphery of the flange. When such a configuration is employed, the flange itself can absorb expansion deformation in the thrust direction caused by overtightening of the adjusting screw, and the depth of focus once finely adjusted in the position adjustment process of the image sensor. However, it is surely prevented from changing due to excessive tightening of the adjusting screw. In addition, the adjustment screw can be tightened again.
[0011]
The electronic component recognition apparatus according to claim 4, wherein an annular relief groove is preferably formed on a flange support surface that faces the sliding surface of the flange in the inner wall surface of the flange housing portion. When such a configuration is adopted, even when the flange is inflated and deformed in the thrust direction due to overtightening of the adjusting screw, the inflated and deformed portion can be absorbed into the escape groove, and in the position adjustment process of the image sensor, The focal depth once finely adjusted is reliably prevented from changing due to excessive tightening of the adjusting screw. In addition, the adjustment screw can be tightened again.
[0012]
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.
[0013]
FIG. 1 is a sectional view showing an electronic component recognition apparatus according to the present invention. The electronic component recognition apparatus 1 shown in FIG. 1 has a small-field body A and a large-field body B that extend upward from a housing H that extends in the horizontal direction, and the small-field body A is positioned approximately at the center of the housing H. The large visual field main body B is located at the rear end of the housing H. The small-field main body A has an image sensor unit 3 in which an image sensor 2 made of CCD is incorporated, and the large-field main body B has an image sensor unit 5 in which an image sensor 4 made of CCD is incorporated. Yes.
[0014]
The image pickup device units 3 and 5 are respectively fixed to lens barrels 6 and 7 arranged at right angles to the housing H, and the small-field lens barrel 6 is fixed to the center of the housing H, and inside thereof. An imaging lens 8 is provided. Similarly, the large visual field lens barrel 7 is fixed to the rear end of the housing H and has an imaging lens 9 therein. In addition, a plurality of illumination light sources 11 that emit light toward the bottom surface of the electronic component P conveyed to the imaging position by the suction nozzle 10 are arranged at the front end of the housing H. Each illumination light source 11 consists of LED, and is arranged in the shape of a ring on the wall surface of the imaging window 12 that receives the reflected light from the electronic component P. A dustproof glass 13 is fitted in the imaging window 12.
[0015]
A total reflection mirror 14 positioned immediately below the imaging window 12 is fixed in the housing H, and the reflection surface of the total reflection mirror 14 is inclined 45 ° in order to bend the light reflected by the electronic component P by 90 °. Yes. Further, a half mirror prism 15 located immediately below the imaging lens 8 is fixed between the total reflection mirror 14 and the imaging lens 8 in the center of the housing H, and a mirror surface 15a of the half mirror prism 15 is fixed. The optical path is branched into two, upward and horizontal. Further, at the rear end in the housing H, a total reflection mirror 16 positioned immediately below the imaging lens 9 is fixed between the half mirror prism 15 and the imaging lens 9, and the total reflection mirror 16 causes the optical path. Is bent 90 ° upward.
[0016]
As shown in FIG. 2, in the small visual field main body A, an outer sleeve 19 is fitted into a cylindrical lens barrel 6 via a screw coupling portion 18 threaded in the axial direction. The lens barrel 6 is provided with a plurality of screw holes 20 penetrating in a radial direction from the outer wall surface 6a to the inner wall surface 6b so as to face the main body portion 19A of the outer sleeve 19. A set screw 21 is screwed into each screw hole 20, and the outer sleeve 19 is fixed to the lens barrel 6 by screwing the set screw 21.
[0017]
A focus adjustment screw ring 22 is disposed in contact with the upper end surface of the lens barrel 6, and an internal thread portion 22 a is provided on the inner peripheral surface of the focus adjustment screw ring 22, and the outer surface of the main body portion 19 A of the outer sleeve 19 is provided. Is provided with a male screw portion 19a that is screwed into the female screw portion 22a. Therefore, the outer sleeve 19 is adjustably fixed to the lens barrel 6 via the screw coupling portion 18 by screwing the female screw portion 22a and the male screw portion 19a and using the set screw 21. That is, the outer sleeve 19 is advanced and retracted in the thrust (axis) direction by rotating the focus adjustment screw ring 22 by a desired amount while the outer sleeve 19 is temporarily fixed to the lens barrel 6 using the set screw 21. The focus of the image sensor 2 is adjusted while changing the distance between the imaging lens 8 and the image sensor 2. After this focus adjustment, the outer sleeve 19 is firmly fixed to the lens barrel 6 by tightening the set screw 21 again.
[0018]
On the other hand, an inner sleeve 24 is fitted into the opening end of the image sensor unit 3 via a screw coupling portion 23 that is threaded in the axial direction. The screw coupling portion 23 includes a female screw portion 3 a formed on the inner wall surface of the opening end of the image sensor unit 3 and a male screw portion 24 a formed on the outer wall surface of the inner sleeve 24. Then, when the female screw portion 3 a and the male screw portion 24 a are screwed together, the inner sleeve 24 is fixed to the imaging element unit 3.
[0019]
Here, at the time of adjusting the position of the image sensor 2, the inner sleeve 24 can be freely rotated with respect to the outer sleeve 19. Specifically, a cylindrical flange 25 that protrudes outward is provided at the end of the inner sleeve 24, and a flange housing portion 26 that surrounds the flange 25 from the outside is provided at the end of the outer sleeve 19. ing. That is, the outer wall 28 of the flange 25 is surrounded by the inner wall surface 27 of the flange housing portion 26. An inner wall surface 27 of the flange accommodating portion 26 is formed in a U-shaped cross section from a band-shaped inner circumferential surface 27a and flange support surfaces 27b and 27c positioned above and below the inner circumferential surface 27a, and an outer surface 28 of the flange 25 is The belt-shaped peripheral end surface 28a and sliding surfaces 28b and 28c positioned above and below the peripheral end surface 28a are formed in a U-shaped cross section.
[0020]
The circumferential end surface 28a of the flange 25 and the inner peripheral surface 27a of the flange accommodating portion 26 are opposed to each other, and a gap S is provided between the peripheral end surface 28a and the inner peripheral surface 27a over the entire circumference. ing. As a result, the flange 25 can freely move in the radial direction and the circumferential direction in a plane perpendicular to the optical axis L in the flange housing portion 26. Further, the sliding surfaces 28b, 28c of the flange 25 and the flange support surfaces 27b, 27c of the flange accommodating portion 26 are opposed to each other so that a very slight thrust gap of about several microns is provided in the thrust direction (axial direction). As a result, the flange 25 can move only in the radial direction and the circumferential direction in the flange housing portion 26, and the movement in the thrust direction is appropriately pressed down. In consideration of assembling workability when the flange 25 is fitted into the flange accommodating portion 26, a thrust retainer ring 26A with a screw coupling portion 29 interposed is provided in a part of the flange accommodating portion 26. Further, the amount of the thrust gap described above is adjusted by the tightening amount of the thrust retainer ring 26A.
[0021]
If comprised in this way, as shown in FIG. 3, the center position of the image pick-up element 2 has shifted | deviated with respect to the optical axis L in the lens barrel 6 as shown by the continuous line of FIG. Even when the image sensor 2 is tilted by the angle θ, the operator moves the image sensor unit 3 by hand while looking at a monitor (not shown) to adjust the alignment of the image sensor 2 and the angle deviation. The image sensor unit 3 can be moved to a position (two-dot chain line). The position of the two-dot chain line is preferably at the center of the field of view where the image pickup device 2 can recognize the entire electronic component P.
[0022]
As shown in FIGS. 2 and 4, the flange accommodating portion 26 is formed with a screw hole 30 extending in a direction orthogonal to the optical axis L. The screw hole 30 extends from the outer wall surface 26a to the inner peripheral surface 27a. A total of eight are provided with an index angle of 45 ° around the flange housing portion 26. An adjustment screw 31 is inserted into each screw hole 30 to enable fixing and fine adjustment of the flange 25 by a tool such as a driver. Thus, since the screw hole 30 is formed in the flange accommodating portion 26 on the fixed side, the screw hole 30 does not follow the rotation of the flange 25 when adjusting the angular deviation of the image sensor 2. The initial set position will always be kept.
[0023]
Accordingly, the screw hole 30 is displaced from the position set in advance by the operator, and there is no unexpected situation in which the adjustment screw 31 cannot be tightened with a tool such as a screwdriver. It is possible to reliably carry out with the planned screw hole 30. Then, by adjusting the pressing amount between the opposing adjustment screws 31, fine adjustment of the center alignment can be reliably achieved on the micron order.
[0024]
The unexpected situation as described above becomes a problem as the small-field main body A and the large-field main body B come close to each other. Although not shown, when three or more image sensor units are installed in the housing H, the effect is remarkable when downsizing of the device 1 is required.
[0025]
The same structure is adopted for the large visual field body B, and the description thereof is omitted.
[0026]
The present invention is not limited to the embodiment described above.
[0027]
For example, as shown in FIG. 5, a protrusion 33 that abuts the tip of the adjustment screw 31 is formed at the center of the peripheral end surface 28Aa of the flange 25A, and the protrusion 33 has a belt-like shape over the entire periphery of the flange 25A. Protrusions are formed. That is, the protrusion 33 is embodied by applying L-shaped cut portions 34 to the upper and lower edges of the peripheral end surface 28Aa. When such a projection portion 33 having a rectangular cross section is employed, the cut portion 34 can absorb expansion deformation in the thrust direction (arrow direction) of the flange 25 </ b> A caused by excessive tightening of the adjustment screw 31. Therefore, in the process of adjusting the position of the image sensor 2, it is possible to reliably prevent the focal depth that should have been finely adjusted from being changed due to excessive tightening of the adjusting screw 31. In addition, it is possible to avoid a situation such as part replacement due to excessive tightening of the adjusting screw 31.
[0028]
Similarly, as shown in FIG. 6, a protrusion 35 is also formed at the center of the peripheral end face 28Ba of the flange 25B, and this protrusion 35 is formed in a band shape over the entire periphery of the flange 25B. That is, the protrusion 35 is embodied by applying a tapered cut portion 36 to the upper and lower edges of the peripheral end surface 28Ba. When such a trapezoidal section 35 is adopted, the cut portion 36 can absorb expansion deformation in the thrust direction (arrow direction) of the flange 25 </ b> B caused by excessive tightening of the adjusting screw 31.
[0029]
Further, as shown in FIG. 7, annular relief grooves 37 and 38 are formed on the flange support surfaces 27Ab and 27Ac of the flange accommodating portion 40, and the relief grooves 37 and 38 are formed on the sliding surfaces 28 b and 28 c of the flange 25. While facing each other, it is located on the extension of the peripheral end face 28a. One escape groove 37 is formed in the thrust retainer ring 40A. When such escape grooves 37 and 38 are employed, even when the flange 25 is inflated and deformed in the thrust direction due to excessive tightening of the adjustment screw 31, the inflated and deformed portions can be absorbed by the escape grooves 37 and 38. . Therefore, in the process of adjusting the position of the image sensor 2, it is possible to reliably prevent the focal depth that should have been finely adjusted from being changed due to excessive tightening of the adjusting screw 31. In addition, it is possible to avoid a situation such as part replacement due to excessive tightening of the adjusting screw 31.
[0030]
【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 in the image sensor unit via an imaging lens provided in the lens barrel. In an electronic component recognition apparatus for recognizing an image of an electronic component by an image sensor, a cylindrical flange that is provided on the open end side of the image sensor unit and projects outward, and on the open end side of the lens barrel A flange housing portion having an inner wall surface that is provided and surrounds the outer surface of the flange from the outside, and extends perpendicularly to the optical axis in the lens barrel and extends from the outer wall surface of the flange housing portion to the inner peripheral surface of the inner wall surface. A screw hole that penetrates the screw hole and an adjustment screw that is screwed into the screw hole so that the tip of the outer surface of the flange comes into contact with the outer peripheral surface of the flange, and is provided between the peripheral end surface of the flange and the inner peripheral surface of the flange housing portion. Is that By gap is provided over the circumference, it is possible to reliably position adjustment of the imaging device.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of an electronic component recognition apparatus according to the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part of the electronic component recognition apparatus shown in FIG.
FIG. 3 is a schematic diagram showing a positional relationship between an optical axis of a lens barrel and an image sensor.
4 is a schematic diagram showing a positional relationship between a large-field main body and a small-field main body in FIG. 1. FIG.
FIG. 5 is an enlarged cross-sectional view showing a main part of a second embodiment of the electronic component recognition apparatus according to the present invention.
FIG. 6 is an enlarged cross-sectional view showing a main part of a third embodiment of the electronic component recognition apparatus according to the present invention.
FIG. 7 is an enlarged cross-sectional view showing a main part of a fourth embodiment of the electronic component recognition apparatus according to the present invention.
FIG. 8 is a cross-sectional view showing a conventional electronic component recognition apparatus.
9 is an enlarged cross-sectional view of a main part of the conventional electronic component recognition apparatus shown in FIG.
10 is a schematic diagram showing the positional relationship between the large field main body and the small field main body of FIG.
[Explanation of symbols]
P ... electronic component, L ... optical axis, 1 ... electronic component recognition device, S ... gap, 2,4 ... imaging device, 3,5 ... imaging device unit, 6,7 ... lens barrel, 8,9 ... imaging lens , 18, 23..., Screw coupling portion, 19, outer sleeve, 24, inner sleeve, 25, 25 A, 25 B, flange, 26, 40, flange housing portion, 26 a, outer wall surface of the flange housing portion, 27, of the flange housing portion. Inner wall surface, 27a ... inner peripheral surface, 27b, 27c, 27Ab, 27Ac ... flange support surface, 28 ... outer surface of flange, 28a, 28Aa, 28Ba ... peripheral end surface, 28b, 28c ... sliding surface, 30 ... screw hole, 31 ... adjustment screw, 33, 35 ... projection, 37 ... relief groove.

Claims (4)

The electronic component placed at a predetermined location is illuminated with illumination light, and the reflected light from the electronic component is incident on the image sensor in the image sensor unit via the imaging lens provided in the lens barrel, In the electronic component recognition apparatus for recognizing the image of the electronic component by the imaging element,
A cylindrical flange which is provided on the opening end side of the image sensor unit and protrudes outward;
A flange housing portion provided on the opening end side of the lens barrel and having an inner wall surface surrounding the outer surface of the flange from the outside;
A screw hole extending perpendicularly to the optical axis in the lens barrel and penetrating from an outer wall surface of the flange housing portion to an inner peripheral surface of the inner wall surface;
An adjustment screw that is screwed into the screw hole and has a tip abutting on a peripheral end surface of the outer surface of the flange;
An electronic component recognizing device, wherein a gap is provided over the entire circumference between the peripheral end surface of the flange and the inner peripheral surface of the flange housing portion. The flange is provided on a cylindrical inner sleeve joined to the imaging element unit via a screw coupling portion, and the flange housing portion is a cylindrical outer sleeve joined to the lens barrel via a screw coupling portion. The electronic component recognition apparatus according to claim 1, wherein the electronic component recognition apparatus is provided on a sleeve. The electronic component recognition apparatus according to claim 1, wherein a protrusion that abuts the tip of the adjustment screw is formed at the center of the peripheral end surface of the flange so as to protrude over the entire periphery of the flange. . The electron according to any one of claims 1 to 3, wherein an annular relief groove is formed on a flange support surface facing the sliding surface of the flange among the inner wall surface of the flange housing portion. Component recognition device.

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