JPH11183129A - Electronic part recognizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic part recognizing device for sure position adjustment of an imaging element. SOLUTION: A cylindrical flange 25 which, provided on an opening end side of an imaging element unit 3, protrudes outside, a flange housing part 26 comprising an inner wall surface 27 which, provided on an opening end side of a lens barrel 6, encloses, from outside, an outer surface 28 of the flange 25, a threaded hole 30 which, extending vertically to optical axis L in the lens barrel 6, penetrates from an outer wall surface 26a of the flange housing part 26 to an inner peripheral surface 27a among the inner wall surface 27, and an adjustment screw 31 which is screwed in the threaded hole 30 to contact, by its tip end, a peripheral end surface 28a among the outer surface of the flange 25 are provided. Here, between the peripheral end surface 28a of the flange 25 and the inner peripheral surface 27a of the flange housing part 26, a spacing S is provided over its entire periphery.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component recognizing device, and more particularly to an electronic component recognizing device for recognizing a state of an electronic component before mounting the electronic component on a substrate.

[0002]

2. Description of the Related Art FIG.
Has a small-field main body C and a large-field main body D, as shown in FIG.
The small-field main body C has an image sensor unit 101 in which an image sensor 103 composed of a CCD is incorporated.
Has an image sensor unit 102 in which an image sensor 104 composed of a CCD is incorporated. The respective image sensor units 101 and 102 are fixed to lens barrels 107 and 108 arranged at right angles to the housing H, respectively.
In 07 and 108, imaging lenses 105 and 106 are provided. Also, at the end of the housing H, the electronic component P transported to the imaging position by the suction nozzle 109
An illumination light source 110 for irradiating light toward the bottom surface is arranged. In the housing H, a total reflection mirror 1 for bending the optical path of the reflected light from the electronic component P by 90 ° is provided.
11 are 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.

As shown in FIG. 9, a fixed side sleeve 114 is screwed to the lens barrel 107 via a screw connection M1.
Are formed. The movable sleeve 11 is connected to the opening end of the image sensor unit 101 via a screw connection M2.
6 is screwed into the sleeve 116, and a flange accommodating portion 117 surrounding the flange 115 is provided at an end of the sleeve 116. That is, the sleeve 114 is attached to the lens barrel 107.
, And the sleeve 116 is fixed to the image sensor unit 101 with a screw.
It has a degree of freedom in the radial direction and the rotation direction with respect to the flange 115, and can be freely moved in a plane perpendicular to the optical axis L. This configuration is used for adjusting the alignment between the optical axis L in the lens barrel 107 and the center of the image sensor 103. A plurality of screw holes 118 are provided in the flange accommodating portion 117, and each screw hole 118 has an adjusting screw 11.
9 is screwed. Therefore, the image sensor unit 1
01 while moving the optical axis L and the image sensor 1 in the horizontal direction.
After performing the centering with 03, fine adjustment of the alignment is performed while the adjusting screw 119 is tightened.

[0004]

However, since the conventional electronic component recognition device is configured as described above, there are the following problems.

[0005] That is, as shown in FIG.
18 is provided in the flange accommodating portion 117 at an index angle of 45 °, but when the position of the image sensor 103 is adjusted, as a result of rotating the flange accommodating portion 117, the screw hole 118 also rotates and the screw hole 118 is rotated. It is very difficult to predict where the position of the hole 118 will be finally due to its structure. Therefore, the screw hole 1 on the side close to the large visual field body D
If the imaging device 18 becomes unusable because it is blocked by the large-field main body D, a situation may occur in which the adjustment screw 119 cannot be uniformly tightened by a tool such as a screwdriver, and as a result, the positioning of the image sensor is finely performed on the order of microns. It becomes difficult to adjust.
In particular, the closer the small visual field main body C and the large visual field main body D are, the more the problem becomes. In order to solve such a problem, it is conceivable that the small visual field main body C and the large visual field main body D are largely separated from each other, but there is a problem that the apparatus itself becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an electronic component recognizing apparatus capable of surely adjusting the position of an image sensor.

[0007]

According to a first aspect of the present invention, there is provided an electronic component recognizing apparatus which illuminates an electronic component disposed at a predetermined position with illumination light, and reflects reflected light from the electronic component into a lens barrel. In an electronic component recognition device for recognizing an image of an electronic component by an image sensor, the image sensor is made incident on an image sensor in an image sensor unit via an imaging lens provided therein. A cylindrical flange that is provided and protrudes outward, a flange housing portion that is provided on the opening end side of the lens barrel and has an inner wall surface that surrounds the outer surface of the flange from the outside, and an optical axis in the lens barrel And a screw hole that extends vertically and penetrates from the outer wall surface of the flange accommodating portion to the inner peripheral surface of the inner wall surface, and is screwed into the screw hole so that the tip abuts on the peripheral end surface of the outer surface of the flange. Equipped with screws Between the peripheral end face and the inner peripheral surface of the flange accommodating portion of the flange, and wherein a gap is provided over the entire circumference.

[0008] In this electronic component recognition device, the flange and the flange accommodating portion move relative to each other through the gap.
As a result of providing the flange accommodating portion on the lens barrel side and providing the flange on the image pickup device unit side, the flange accommodating portion is fixed and the flange is movable. Therefore, when adjusting the position of the image sensor in the image sensor unit with respect to the optical axis in the lens barrel, the position of the image sensor is adjusted while moving the flange in the flange accommodating portion in the radial direction. Further, the angle of the image sensor is adjusted while rotating the flange. For such adjustments, the screw holes
Without keeping up with the rotation of the flange, the desired position is always kept, so that there is no unforeseen situation that the operator deviates from the preset initial position. Therefore, the adjusting screw can be securely screwed into the initially planned screw hole, and the fine adjustment in the micron order intended by the operator is ensured.

According to a second aspect of the present invention, the flange is provided on a cylindrical inner sleeve joined to the image pickup device unit via a screw joint, and the flange accommodating portion is provided on the lens barrel with a screw joint. It is preferable to be provided on a cylindrical outer sleeve that is joined through the outer sleeve. In this way, by incorporating the inner sleeve and the outer sleeve between the lens barrel and the image sensor unit, the degree of freedom in assembly and design is increased, and at the same time, the amount of screwing of the outer sleeve into the lens barrel can be adjusted, A focus adjustment operation while changing the distance between the imaging element and the imaging lens is facilitated.

[0010] In the electronic component recognition device according to the third aspect, it is preferable that a protrusion for contacting the tip of the adjustment screw is formed at the center of the peripheral end surface of the flange so as to protrude all around the flange. In the case of adopting such a configuration, the expansion deformation in the thrust direction of the flange caused by excessive tightening of the adjustment screw can be absorbed by the flange itself, and the depth of focus once finely adjusted in the process of adjusting the position of the image sensor. However, it is surely prevented from being changed due to excessive tightening of the adjusting screw. Also, it is possible to retighten the adjusting screw.

In the electronic component recognition device according to the present invention, it is preferable that an annular relief groove is formed on a flange support surface of the inner wall surface of the flange accommodating portion facing the sliding surface of the flange. When such a configuration is adopted, even if the flange is expanded and deformed in the thrust direction due to excessive tightening of the adjusting screw, the expanded and deformed portion can be absorbed in the clearance groove, and in the process of adjusting the position of the image sensor, The depth of focus once finely adjusted is reliably prevented from changing due to excessive tightening of the adjustment screw. Also, it is possible to retighten the adjusting screw.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an electronic component recognition apparatus according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing an electronic component recognition apparatus according to the present invention. The electronic component recognition device 1 shown in FIG.
It has a small-view main body A and a large-view main body B extending upward from a horizontally extended housing H, and the small-view main body A is located substantially at the center of the housing H. Located on the edge. The main body A of the small visual field is a CCD.
Image sensor unit 3 incorporating an image sensor 2 composed of
And the large-field main body B has an image sensor unit 5 in which the image sensor 4 composed of a CCD is incorporated.

The image pickup device units 3 and 5 are fixed to lens barrels 6 and 7 arranged at right angles to the housing H. The lens barrel 6 for small visual field is fixed to the center of the housing H. It has an imaging lens 8 inside.
Similarly, the lens barrel 7 for a large field of view is fixed to the rear end of the housing H, and has an imaging lens 9 therein. A suction nozzle 10 is provided at the front end of the housing H.
A plurality of illumination light sources 11 for irradiating light are arranged toward the bottom surface of the electronic component P transported to the imaging position by the above. Each illumination light source 11 is composed of an LED, and is arranged in a ring shape 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 into the imaging window 12.

In the housing H, a total reflection mirror 14 located just below the imaging window 12 is fixed, and the reflection surface of the total reflection mirror 14 is 45 ° to bend the light reflected by the electronic component P by 90 °. Is tilted. Further, in the center of the housing H, the total reflection mirror 14 and the imaging lens 8
A half-mirror prism 15 located directly below the imaging lens 8 is fixed between the mirror lens 15 and the mirror surface 15a of the half-mirror prism 15. The half mirror prism 15 divides the optical path into two paths, an upper path and a horizontal path. Further, at the rear end in the housing H, between the half mirror prism 15 and the imaging lens 9, a total reflection mirror 16 located immediately below the imaging lens 9 is provided.
Is fixed, and the total reflection mirror 16 bends the optical path upward by 90 °.

As shown in FIG. 2, an outer sleeve 19 is fitted into the cylindrical lens barrel 6 of the small visual field main body A via a screw connection portion 18 which is threaded in the axial direction. The lens barrel 6 has a plurality of screw holes 2 penetrating in a radial direction from the outer wall surface 6a to the inner wall surface 6b to face the main body 19A of the outer sleeve 19.
0 is provided. 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.

Further, a focus adjusting screw ring 22 is disposed in contact with the upper end surface of the lens barrel 6, and a female screw portion 22 a is provided on an inner peripheral surface of the focus adjusting screw ring 22, and a main body portion 19 A of the outer sleeve 19 is provided. The female screw portion 22a
And a male screw portion 19a that is screwed with the screw. Therefore,
By screwing the female screw portion 22a and the male screw portion 19a and using the set screw 21, the outer sleeve 19 is
It is adjustably fixed to the lens barrel 6 via a screw connection portion 18. That is, 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 outer sleeve 19 moves forward and backward in the thrust (axial line) direction. While changing the distance between the imaging lens 8 and the image sensor 2,
The focus of the image sensor 2 is adjusted. After this focus adjustment, the outer sleeve 19 is firmly fixed to the lens barrel 6 by tightening the set screw 21 again.

On the other hand, an inner sleeve 24 is fitted into the opening end of the image pickup device unit 3 via a screw connection portion 23 which 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 3a and the male screw portion 24a are screwed together, the inner sleeve 24 is fixed to the image sensor unit 3.

Here, when adjusting the position of the image sensor 2, the inner sleeve 24 is
Is configured to be able to rotate freely. Specifically,
A cylindrical flange 25 protruding outward is provided at an end of the inner sleeve 24, and a flange accommodating portion 26 surrounding the flange 25 from the outside is provided at an end of the outer sleeve 19. That is, the inner wall surface 27 of the flange accommodating portion 26 surrounds the outer surface 28 of the flange 25. The inner wall surface 27 of the flange accommodating portion 26 is formed in a U-shaped cross section from a belt-shaped inner peripheral surface 27a and flange support surfaces 27b and 27c located above and below the inner peripheral surface 27a. , A belt-shaped peripheral end surface 28a and sliding surfaces 28b, 28 located above and below the peripheral end surface 28a.
c to form a U-shaped cross section.

The peripheral 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 clearance S is formed between the peripheral end surface 28a and the inner peripheral surface 27a over the entire circumference. Is provided. As a result, the flange 25 can move freely in the radial direction and the circumferential direction in a plane perpendicular to the optical axis L in the flange accommodating portion 26. Further, the sliding surfaces 28b, 28c of the flange 25 and the flange supporting surfaces 27b, 27c of the flange accommodating portion 26 are opposed to each other so as to provide a very small thrust gap of about several microns 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 accommodating portion 26, and the movement in the thrust direction is appropriately pressed down. In consideration of assembly workability when fitting the flange 25 into the flange accommodating portion 26, a part of the flange accommodating portion 26 includes
9 is provided with a thrust holding ring 26A. Further, the amount of the above-described thrust gap is adjusted by the tightening amount of the thrust holding ring 26A.

With this configuration, as shown in FIG. 3, when the apparatus 1 is set, the center position of the image sensor 2 is set with respect to the optical axis L in the lens barrel 6 as shown by a solid line in FIG. Even when the image sensor 2 is displaced or 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) while adjusting the alignment and the angle of the image sensor 2. The image sensor unit 3 can be moved to a desired position (two-dot chain line). The position of the two-dot chain line is preferably at the center of the visual field where the entire electronic component P can be recognized by the image sensor 2.

As shown in FIGS. 2 and 4, a screw hole 30 extending in a direction perpendicular to the optical axis L is formed in the flange accommodating portion 26, and the screw hole 30 extends from the outer wall surface 26a to the inner periphery. A total of eight holes are provided at the periphery of the flange accommodating portion 26 at an index angle of 45 °. An adjusting 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 screwdriver. in this way,
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 angle shift of the imaging device 2.
You will always keep the original setting position.

Therefore, there is no unforeseen situation that the screw hole 30 is displaced from a position set by the operator in advance and the adjustment screw 31 cannot be tightened with a tool such as a screwdriver. Can be reliably performed in the screw hole 30 initially planned. By adjusting the amount of pressing between the adjusting screws 31 facing each other, fine adjustment of centering can be reliably achieved on the order of microns.

The above-mentioned unexpected situation becomes more problematic as the small-field main body A and the large-field main body B come closer to each other.
Although not shown, when three or more image pickup device units are installed in the housing H, the effect is remarkable when miniaturization of the device 1 itself is required.

Note that the same configuration is employed for the large field of view body B, and a description thereof will be omitted.

The present invention is not limited to the embodiment described above.

For example, as shown in FIG.
At the center of the peripheral end surface 28Aa of A, a projection 33 is formed to abut the tip of the adjustment screw 31, and this projection 33 is
It is formed in a belt shape over the entire circumference of the flange 25A. That is, the projection 33 is embodied by forming an L-shaped cut portion 34 on the upper and lower edges of the peripheral end surface 28Aa. When the projection 33 having such a rectangular cross section is employed, the cut portion 34 can absorb the expansion deformation of the flange 25A in the thrust direction (the direction of the arrow) caused by excessive tightening of the adjustment screw 31. Therefore,
In the process of adjusting the position of the image sensor 2, the depth of focus, which should have been finely adjusted once, is reliably prevented from changing due to excessive tightening of the adjustment screw 31. Adjustment screw 3
A situation such as replacement of parts due to excessive tightening of 1 can be avoided.

Similarly, as shown in FIG.
A projection 35 is also formed at the center of the peripheral end surface 28Ba of B,
The protruding portion 35 is formed in a belt-like shape over the entire circumference of the flange 25B. That is, the protrusion 35
Are tapered cut portions 3 at the upper and lower edges of the peripheral end face 28Ba.
6 is embodied. When such a protrusion 35 having a trapezoidal cross section is employed, the cut portion 36 can absorb the expansion deformation of the flange 25 </ b> B in the thrust direction (the direction of the arrow) caused by the overtightening of the adjustment screw 31.

As shown in FIG. 7, annular escape grooves 37, 38 are formed in the flange support surfaces 27Ab, 27Ac of the flange accommodating portion 40, and the escape grooves 37, 38 are formed on the sliding surface 28b of the flange 25. , 28c and is located on an extension of the peripheral end surface 28a. In addition, one of the escape grooves 37
Is formed on the thrust holding ring 40A. When the escape grooves 37 and 38 are employed, even if the flange 25 is expanded and deformed in the thrust direction due to excessive tightening of the adjusting screw 31, the expanded and deformed portions are formed as the escape grooves 37 and 3.
8 can be absorbed. Therefore, in the process of adjusting the position of the image sensor 2, the depth of focus, which should have been finely adjusted once, is reliably prevented from changing due to excessive tightening of the adjustment screw 31. Further, it is possible to avoid a situation such as replacement of parts due to excessive tightening of the adjustment screw 31.

[0030]

The electronic component recognition apparatus according to the present invention is configured as described above, and thus has the following effects.
That is, an electronic component arranged in a predetermined place is illuminated by illumination light, and reflected light from the electronic component is incident on an image sensor in an image sensor unit via an imaging lens provided in a lens barrel. In the electronic component recognition device for recognizing the image of the electronic component by the image pickup device, a cylindrical flange provided on the opening end side of the image pickup device unit and protruding outward and an opening end side of the lens barrel are provided. A flange accommodating portion provided with 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 extending from the outer wall surface of the flange accommodating portion to the inner peripheral surface of the inner wall surface. It has a screw hole that penetrates, an adjusting screw that is screwed into the screw hole and makes the tip abut on the peripheral end surface of the outer surface of the flange, and between the peripheral end surface of the flange and the inner peripheral surface of the flange accommodating 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 device according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the electronic component recognition device shown in FIG.

FIG. 3 is a schematic diagram illustrating a positional relationship between an optical axis of a lens barrel and an image sensor.

FIG. 4 is a schematic diagram illustrating a positional relationship between a large-field main body and a small-field main body in FIG. 1;

FIG. 5 is an essential part enlarged sectional view showing a second embodiment of the electronic component recognition device according to the present invention.

FIG. 6 is an enlarged sectional view of a main part showing an electronic component recognition device according to a third embodiment of the present invention.

FIG. 7 is an enlarged sectional view of an essential part showing a fourth embodiment of the electronic component recognition device according to the present invention.

FIG. 8 is a sectional view showing a conventional electronic component recognition device.

FIG. 9 is an enlarged sectional view of a main part of the conventional electronic component recognition device shown in FIG.

FIG. 10 is a schematic diagram showing a positional relationship between a large-field main body and a small-field main body in FIG. 8;

[Explanation of symbols]

P: electronic component, L: optical axis, 1: electronic component recognition device, S:
Gap, 2,4 ... image sensor, 3,5 ... image sensor unit,
6, 7 ... lens barrel, 8, 9 ... imaging lens, 18, 23 ... screw connection part, 19 ... outer sleeve, 24 ... inner sleeve, 25, 25A, 25B ... flange, 26, 40 ...
Flange receiving portion, 26a: outer wall surface of flange receiving portion, 2
7 ... inner wall surface of the flange housing portion, 27a ... inner peripheral surface, 27
b, 27c, 27Ab, 27Ac ... flange support surface, 2
8: outer surface of flange, 28a, 28Aa, 28Ba: peripheral end surface, 28b, 28c: sliding surface, 30: screw hole, 31:
Adjusting screws, 33, 35 ... projections, 37 ... escape grooves.

Claims (4)

[Claims] An electronic component arranged at a predetermined location is illuminated by illumination light, and reflected light from the electronic component is imaged in an image sensor unit via an imaging lens provided in a lens barrel. In an electronic component recognition device for causing an image to enter the device and recognizing an image of the electronic component by the imaging device, a cylindrical flange provided on an opening end side of the imaging device unit and protruding outward; A flange accommodating 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 outside; an outer wall surface of the flange accommodating portion extending perpendicular to an optical axis in the lens barrel And a screw hole that penetrates from the inner wall surface to the inner peripheral surface of the inner wall surface; and an adjusting screw that is screwed into the screw hole and abuts a tip on a peripheral end surface of the outer surface of the flange. Between the inner peripheral surface of the peripheral edge surface of Nji and the flange accommodating part, the electronic component recognition unit, wherein a gap is provided over the entire circumference. 2. The method according to claim 1, wherein the flange is provided on a cylindrical inner sleeve joined to the image sensor unit via a screw joint, and the flange accommodating part is joined to the lens barrel via a screw joint. 2. The electronic component recognition device according to claim 1, wherein the electronic component recognition device is provided on a cylindrical outer sleeve. 3. In the center of the peripheral end surface of the flange,
3. The electronic component recognition device according to claim 1, wherein a protrusion that abuts a tip of the adjustment screw is formed to protrude over the entire circumference of the flange. 4. 4. A flange support surface facing a sliding surface of the flange in the inner wall surface of the flange accommodating portion,
An annular relief groove is formed.
The electronic component recognition device according to claim 1.