JP4334240B2 - Recognition device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recognition device that recognizes an image of a component such as an IC.
[0002]
[Prior art]
As a recognition device for recognizing an image of a component, for example, as described in Patent Document 1, a device including a camera that captures an end face image of a component and a light emitting diode that illuminates the component is known.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 7-280534
[Problems to be solved by the invention]
However, in the above prior art, the parts are placed one by one on the inspection table and the image is recognized, so that the processing takes a considerable time. In order to solve such a problem, it is conceivable to provide a plurality of cameras and light emitting diodes and simultaneously perform image recognition processing of a plurality of components. However, in this case, the light emitted from the light emitting diode may leak to the adjacent camera and cause light interference (crosstalk), and as a result, an appropriate image may not be obtained.
[0005]
An object of the present invention is to provide a recognition device that can reduce interference of light and improve processing performance.
[0006]
[Means for Solving the Problems]
The present invention is a recognition apparatus including a plurality of image input units that respectively input images of a plurality of objects to be inspected. The image input unit is directed to an imaging unit that images the object to be inspected and to the objects to be inspected. A light emitting diode that has illumination means for irradiating light and an optical filter that transmits light in a predetermined wavelength band among the light emitted by the illumination means, and the illumination means emits light having a single peak wavelength The optical filters of adjacent image input units among the plurality of image input units have different wavelength characteristics that divide the wavelength distribution of light emitted from the light emitting diodes with respect to the peak wavelength. It is characterized by being.
[0007]
By configuring each optical filter of adjacent image input units to have different wavelength characteristics as described above, even if a part of the light irradiated by the illumination means leaks to the adjacent image input unit, the leaked light is It is blocked by the optical filter of the adjacent image input unit. For this reason, when light is simultaneously irradiated to adjacent inspection objects, light interference generated between adjacent image input units can be suppressed. Thereby, it is possible to obtain an appropriate image even when a plurality of objects to be inspected are simultaneously illuminated and images of these objects to be inspected are simultaneously recognized. Therefore, the image recognition processing capability of the inspection object is improved.
[0008]
The illumination means has a light emitting diode that emits light having a single peak wavelength, and each optical filter of the adjacent image input unit sets the wavelength distribution of the light emitted from the light emitting diode to the peak wavelength. since they have different wavelength characteristics as to divide against, it is possible to reduce the influence on the contrast of the image of the object.
[0009]
Preferably, the optical filters of adjacent image input units are formed so that the amount of transmission of light irradiated by the illumination means is substantially equal. In this case, substantially the same brightness can be obtained in the adjacent image input units by giving the same current value to the illumination means of the adjacent image input units. Therefore, it is not necessary to individually set the current value to be supplied to each illumination means in order to balance the amount of light between the image input units.
[0010]
Further preferably, the imaging means is disposed in a casing having an opening, the illumination means is disposed on the opening side of the imaging means in the casing, and the optical filter is attached to the casing so as to close the opening. It has been. In this case, the illumination means and the imaging means in the housing are protected from dust and the like by the optical filter. Therefore, it is not necessary to provide a dustproof member separately.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a recognition device according to the present invention will be described with reference to the drawings.
[0012]
FIG. 1 is a schematic configuration diagram showing an embodiment of a recognition apparatus according to the present invention. In the figure, a recognition apparatus 1 according to the present embodiment is an apparatus provided in a component inspection machine that inspects the posture, direction, quality, etc. of a chip component 2 in a production line for chip components 2. It recognizes images simultaneously and continuously.
[0013]
The recognition apparatus 1 includes a transport unit 3 that transports a plurality of chip components 2 arranged in a matrix. Each chip component 2 is transported while being sucked and held by a plurality of suction nozzles (not shown) provided in the transport unit 3. On the transport line of the chip component 2, a plurality of image input unit 4 for inputting each time a plurality of images of the chip component 2 in each line L _n are juxtaposed.
[0014]
As shown in FIG. 2, each image input unit 4 has a housing 5 having an opening formed on the upper surface. An illumination unit 6 that irradiates light toward the chip component 2 that is transported by the transport unit 3 is disposed in the vicinity of the opening in the housing 5.
[0015]
The illuminating unit 6 includes a plurality of light emitting diodes (LEDs) 7 arranged in a substantially annular shape, and a substantially annular reflecting plate 8 arranged around the LEDs 7. The LED 7 emits light having a single peak wavelength toward the reflector 8. As shown in FIG. 3, the LED 7 has an emission wavelength distribution characteristic such that a peak of emission intensity exists in a wavelength region of about 660 nm at room temperature. The reflecting plate 8 reflects the light emitted from the LED 7 obliquely upward. Thereby, the chip component 2 conveyed by the conveyance unit 3 is illuminated from below.
[0016]
Below the illumination unit 6 in the housing 5, an imaging lens 9 that forms an image of light reflected by the chip component 2, and an imaging element that captures an image of the chip component 2 imaged by the imaging lens 9. 10 are arranged. For example, an area image sensor is used as the image sensor 10.
[0017]
As described above, by using the LED 7 having the same emission wavelength distribution characteristics as the light source of the illumination section 6 of each image input unit 4, the illumination distribution characteristics, directivity characteristics, aging characteristics, temperature characteristics in each illumination section 6 are used. And the like become uniform, so that it is possible to obtain substantially the same image in each of the image pickup devices 10. Further, in addition to such characteristics, the electrical circuit of each illumination unit 6 has the same configuration, so that management of each illumination unit 6 is facilitated.
[0018]
An optical filter 11 that transmits light in a predetermined wavelength band out of the light irradiated by the illumination unit 6 is attached to the upper part of the housing 5 so as to close the opening of the housing 5. Thereby, light in a predetermined wavelength band out of the light from the illumination unit 6 is transmitted through the optical filter 11 and reflected by the chip component 2, and the reflected light is transmitted through the optical filter 11 again through the imaging lens 9. The light enters the image sensor 10. The optical filter 11 also serves as dust-proof glass for protecting the inside of the housing 5 from dust and the like.
[0019]
Each optical filter 11 of the adjacent image input unit 4 among the plurality of image input units 4 has different wavelength characteristics such that the wavelength distribution of the light irradiated by the illumination unit 6 is divided into two with respect to the peak wavelength. ing.
[0020]
Specifically, one of the optical filters 11 of the adjacent image input units 4 (hereinafter sometimes referred to as the optical filter 11A) emits light (emission wavelength) as shown in FIG. Among the distribution characteristics P), it has a wavelength characteristic Q ₁ that transmits only light in a wavelength band having a peak center wavelength λ ₀ (about 660 nm) or less. Further, the other of the optical filters 11 of the adjacent image input units 4 (hereinafter also referred to as the optical filter 11B) is light emitted from the LED 7 (light emission wavelength distribution characteristic P as shown in FIG. 4B). ) Has a wavelength characteristic Q ₂ that transmits only light in a wavelength band having a peak center wavelength λ ₀ or more.
[0021]
As described above, in the plurality of image input units 4, by arranging the two types of optical filters 11 </ b> A and 11 </ b> B having different wavelength characteristics alternately, adjacent chip components 2 are irradiated with light having different wavelength distribution characteristics. become. That is, one of the adjacent chip components 2 is irradiated with light in a wavelength band having a peak center wavelength λ ₀ or less, and the other of the adjacent chip components 2 is irradiated with light in a wavelength band having a peak center wavelength λ ₀ or more. Is done.
[0022]
At this time, part of the light transmitted through the optical filter 11 may leak to the adjacent image input unit 4. However, the leaked light that has passed through the optical filter 11A is blocked without passing through the optical filter 11B of the adjacent image input unit 4, and the leaked light that has passed through the optical filter 11B is blocked by the optical filter 11A of the adjacent image input unit 4. It is blocked without passing through.
[0023]
For this reason, even if light is simultaneously applied to the plurality of chip components 2 by the illumination unit 6 of each image input unit 4, light interference (crosstalk) occurs in each housing 5 of the adjacent image input unit 4. It rarely happens. As a result, only light in a wavelength band having a peak center wavelength λ ₀ or less is incident on one of the housings 5 of the adjacent image input units 4, and the other of the housings 5 of the adjacent image input units 4. Only light in a wavelength band having a peak center wavelength λ ₀ or more enters.
[0024]
Further, the optical filters 11A and 11B of the adjacent image input units 4 have a wavelength characteristic that divides the emission wavelength distribution of the light generated by the LED 7 into the peak center wavelength λ ₀ , so that the chip component A sufficient amount of light for reading the second image is secured. Further, since an LED that emits light having a single peak wavelength is used as a light source and the wavelength distribution of the light generated by the LED is divided, the image contrast of the chip component 2 is hardly affected.
[0025]
Furthermore, since the optical filters 11A and 11B are formed so as to divide the wavelength distribution of the light from the LED 7 into two with respect to the peak center wavelength λ ₀ as described above, the amount of transmitted light is the same. For this reason, by providing the same current value to each LED 7 of all the image input units 4, almost uniform brightness can be obtained in all the image input units 4.
[0026]
Thus, simultaneously illuminating all the chip component 2 of each line L _n in the transport unit 3, even when inputting these images of the chip components 2 simultaneously, it is possible to obtain a proper and stable image. In addition, since image recognition of a plurality of chip components 2 is simultaneously performed in this way, the processing capability of image recognition is increased and the processing time can be shortened.
[0027]
Further, as described above, even if the same LED 7 is used as the light source of each illumination unit 6, light interference generated between adjacent image input units 4 is reduced, so that each image input unit 4 (each illumination unit 6). Can be arranged adjacent to each other. Thereby, the recognition apparatus 1 can be reduced in size as a whole.
[0028]
A readout control unit 12 that controls the LED 7 and the image sensor 10 based on an external synchronization signal from a main control unit (not shown) is disposed in the housing 5 of each image input unit 4. The main control unit, when the transport unit 3 is the chip component 2 of each line L _n is conveyed to just above the position of the housings 5, and sends an external synchronization signal to each read control section 12. Then, as shown in FIG. 5, each readout control unit 12 simultaneously sends a light emission timing signal to each LED 7 (LEDs 7 a, 7 b...) And also takes an imaging timing signal to each image sensor 10 (image sensors 10 a, 10 b...). Are sent simultaneously. Thereby, each chip component 2 is simultaneously illuminated by each illumination unit 6 and each chip component 2 is simultaneously imaged by each imaging element 10. The image data of each chip component 2 is sent to a component inspection unit (not shown).
[0029]
The present invention is not limited to the above embodiment. For example, in the above-described embodiment, each optical filter 11 of the adjacent image input units 4 has different wavelength characteristics formed so as to divide the wavelength distribution of the light irradiated by the illumination unit 6 into two. It may have different wavelength characteristics formed so as to divide the wavelength distribution of light into three or more.
[0030]
FIG. 6 shows an example in which the wavelength distribution of the light emitted from the illumination unit 6 is divided into three with respect to the peak wavelength. The optical filter 11 shown in FIG. 6A transmits only light in a wavelength band equal to or less than the wavelength λ ₁ lower than the peak center wavelength λ ₀ . The optical filter 11 shown in FIG. 6B transmits only light in a wavelength band having a wavelength λ ₂ or higher that is higher than the peak center wavelength λ ₀ . The optical filter 11 shown in FIG. 6C transmits only light in the wavelength band from the wavelength λ ₁ to the wavelength λ ₂ . These three types of optical filters are desirably set so that the amount of transmitted light is substantially equal.
[0031]
Moreover, in the said embodiment, although LED7 was used as a light source of the illumination part 6 of each image input unit 4, a white light source etc. may be used.
[0032]
Furthermore, although the said embodiment is provided in a component inspection machine, the recognition apparatus of this invention is applicable if it recognizes the image of several to-be-inspected object simultaneously.
[0033]
【The invention's effect】
According to the present invention, the optical filters of the adjacent image input units among the plurality of image input units have different wavelength characteristics that divide the wavelength distribution of the light irradiated by the illuminating means. Interference of light between the matching image input units is suppressed, whereby an appropriate image of the inspection object can be obtained. Further, since it is possible to simultaneously recognize images of a plurality of objects to be inspected, the processing capability of image recognition is improved.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of a recognition apparatus according to the present invention.
FIG. 2 is a configuration diagram of the image input unit shown in FIG. 1;
FIG. 3 is a diagram showing a light emission wavelength distribution characteristic of the light emitting diode shown in FIG. 2;
4 is a diagram showing the wavelength characteristics of two types of optical filters formed so as to divide the wavelength distribution of the light irradiated by the illumination unit shown in FIG. 2 into two parts.
FIG. 5 is a timing chart showing a control process of a read control unit shown in FIG.
6 is a diagram showing the wavelength characteristics of three types of optical filters formed so as to divide the wavelength distribution of the light irradiated by the illumination unit shown in FIG. 2 into three. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Recognition apparatus, 2 ... Chip component (inspection object), 4 ... Image input unit, 5 ... Case, 6 ... Illuminating part (illuminating means), 7 ... Light emitting diode, 10 ... Imaging element (imaging means), 11 , 11A, 11B... Optical filters.

Claims (3)

A recognition apparatus including a plurality of image input units for inputting images of a plurality of objects to be inspected,
The image input unit transmits imaging light for imaging the inspection object, illumination means for irradiating light toward the inspection object, and light in a predetermined wavelength band among light irradiated by the illumination means. An optical filter,
The illumination means comprises a light emitting diode that emits light having a single peak wavelength;
Each optical filter of an adjacent image input unit among the plurality of image input units has different wavelength characteristics such that the wavelength distribution of light emitted from the light emitting diode is divided with respect to its peak wavelength . A recognition device characterized by that. Wherein the optical filter of the image input unit Adjacent claim 1 Symbol placement of the recognition device, characterized in that the transmission amount of the irradiated light is formed to be substantially equal by the illumination means. The imaging means is disposed in a housing having an opening,
The illumination means is arranged on the opening side of the imaging means in the housing,
The optical filter recognition apparatus according to claim 1 or 2, wherein said mounted to the housing so as to close the opening.

Images