INSPECTION APPARATUS

• US 20150253129A1
• Filed: 02/20/2015
• Published: 09/10/2015
• Est. Priority Date: 03/06/2014
• Status: Abandoned Application

• Current Assignee: Omron Corporation
• Original Assignee: Omron Corporation
• Inventors: OHNISHI, Yasuhiro
• Application Number:
  US14/626,971
• Publication Number:
  US 20150253129A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01B 11/24 for measuring contours or curvatures
• CPC Class Codes: G01B 11/2531 using several gratings, projected with variable angle of incidence on the object, and one detection device
• CPC Class Codes: G01B 11/254 Projection of a pattern, viewing through a pattern, e.g. moiré
• CPC Class Codes: G01N 2021/8816 by using multiple sources, e.g. LEDs
• CPC Class Codes: G01N 2021/8845 Multiple wavelengths of illumination or detection
• CPC Class Codes: G01N 2021/95646 Soldering
• CPC Class Codes: G01N 21/8806 Specially adapted optical and illumination features
• CPC Class Codes: G01N 2201/0627 Use of several LED's for spectral resolution
• CPC Class Codes: G01N 2201/0634 Diffuse illumination

Abstract

In an inspection apparatus having a projection device for projecting pattern light and an obliquely arranged camera, a technology is provided with which favorable measurement performance for measuring solder shapes is realized. If an illumination device is provided with openings for projection devices, then the openings are formed at azimuth directions that are from the X-axis direction and the Y-axis direction. If both an opening for a projection device and an opening for an obliquely arranged camera are provided, then they are arranged at different azimuth directions. Alternatively, it is also possible to provide a supplementary illumination device to supplement deficiencies in the illumination light due to the openings. Alternatively, it is also possible to match the optical axes of the projection device and the obliquely arranged camera and to provide a shared opening.

Claims

1. An inspection apparatus having a camera for photographing a substrate onto which components are soldered from a direction orthogonal thereto,

wherein, taking an intersection of an optical axis of the camera with a substrate conveyed into the inspection apparatus as a point of origin, taking a direction that is parallel to a substrate surface and parallel to a conveyance direction of the substrate as an X-axis, taking a direction that is parallel to the substrate surface and orthogonal to the conveyance direction of the substrate as a Y-axis, taking a direction that is orthogonal to the substrate surface as a Z-axis, taking an angle with respect to the Z-axis as a zenith angle, and taking a direction from the point of origin and within the XY-plane as an azimuth direction, the inspection apparatus comprises:

an illumination device that is configured to illuminate the substrate from all azimuth directions with illumination light whose color or brightness changes stepwise or continuously depending on the zenith angle;

one or more projection devices that are configured to project pattern light onto the substrate from a direction that is oblique with respect to the Z-axis; and

a processing device that is configured to perform an inspection using an image of the substrate that is photographed with the camera in a state in which the illumination device is turned on or in a state in which pattern light is projected from the one or more projection devices;

the one or more projection devices projecting the pattern light onto the substrate through one or more openings that are provided in the illumination device; and

the one or more openings being provided at one or more azimuth directions that are different from both the X-axis direction and the Y-axis direction, as viewed from the point of origin.

2. The inspection apparatus according to claim 1,

wherein the illumination device has a dome-shaped light-emitting region;

at least in the four azimuth directions of the positive X-axis direction, the negative X-axis direction, the positive Y-axis direction, and the negative Y-axis direction, the light-emitting region is continuous from the smallest zenith angle to the largest zenith angle.

3. The inspection apparatus according to claim 1,

wherein the illumination device comprises a plurality of light-emitting bodies with different hue or brightness that are arranged at different zenith angles,

at least in the four azimuth directions of the positive X-axis direction, the negative X-axis direction, the positive Y-axis direction, and the negative Y-axis direction, the plurality of light-emitting bodies are lined up with substantially no gap between them.

4. The inspection apparatus according to claim 1,

wherein, taking an azimuth angle of the positive X-axis direction as 0 degrees, the one or more openings are provided at about 45 degrees, about 135 degrees, about 225 degrees and/or about 315 degrees, viewed from the point of origin.

5. The inspection apparatus according to claim 1,

wherein the inspection apparatus includes two projection devices;

and

an opening for one of the projection devices and an opening for the other of the projection devices are arranged at azimuth directions that differ by 180 degrees, viewed from the point of origin.

6. The inspection apparatus according to claim 1,

further comprising one or more obliquely arranged cameras that are configured to photograph the substrate through one or more openings in the illumination device from one or more directions that are oblique with respect to the Z-axis.

7. The inspection apparatus according to claim 6,

wherein the openings for the one or more projection devices and the openings for the one or more obliquely arranged cameras are at different azimuth directions, viewed from the point of origin.

8. The inspection apparatus according to claim 6,

further comprising an optical member that is configured to match respective optical axes of the one or more projection devices with respective optical axes of the one or more obliquely arranged cameras,

the openings for the one or more projection devices also serving as the openings for the one or more obliquely arranged cameras.

9. The inspection apparatus according to claim 1,

further comprising a supplementary illumination device that irradiates the substrate with supplementary light that supplements deficiencies of the illumination light due to the one or more openings in the illumination device.

10. An inspection apparatus having a camera for photographing a substrate onto which components are soldered from a direction orthogonal thereto,

wherein, taking an intersection of an optical axis of the camera with a substrate conveyed into the inspection apparatus as a point of origin, taking a direction that is parallel to a substrate surface and parallel to a conveyance direction of the substrate as an X-axis, taking a direction that is parallel to the substrate surface and orthogonal to the conveyance direction of the substrate as a Y-axis, taking a direction that is orthogonal to the substrate surface as a Z-axis, taking an angle with respect to the Z-axis as a zenith angle, and taking a direction from the point of origin and within the XY-plane as an azimuth direction, the inspection apparatus comprises:

an illumination device that is configured to illuminate the substrate from all azimuth directions with illumination light whose color or brightness changes stepwise or continuously depending on the zenith angle;

one or more projection devices that are configured to project through one or more openings in the illumination device pattern light onto the substrate from one or more directions that are oblique with respect to the Z-axis;

a supplementary illumination device that irradiates the substrate with supplementary light that supplements deficiencies of the illumination light due to the one or more openings in the illumination device; and

a processing device that is configured to perform an inspection using an image of the substrate that is photographed with the camera in a state in which the illumination device and the supplementary illumination device are turned on or in a state in which pattern light is projected from the one or more projection devices.

11. An inspection apparatus having a camera for photographing a substrate onto which components are soldered from a direction orthogonal thereto,

wherein, taking an intersection of an optical axis of the camera with a substrate conveyed into the inspection apparatus as a point of origin, taking a direction that is parallel to a substrate surface and parallel to a conveyance direction of the substrate as an X-axis, taking a direction that is parallel to the substrate surface and orthogonal to the conveyance direction of the substrate as a Y-axis, taking a direction that is orthogonal to the substrate surface as a Z-axis, taking an angle with respect to the Z-axis as a zenith angle, and taking a direction from the point of origin and within the XY-plane as an azimuth direction, the inspection apparatus comprises:

an illumination device that is configured to illuminate the substrate from all azimuth directions with illumination light whose color or brightness changes stepwise or continuously depending on the zenith angle;

one or more projection devices that are configured to project through one or more openings in the illumination device pattern light onto the substrate from one or more directions that are oblique with respect to the Z-axis;

one or more obliquely arranged cameras that are configured to photograph the substrate through one or more openings in the illumination device from one or more directions that are oblique with respect to the Z-axis; and

a processing device that is configured to perform an inspection using an image of the substrate that is photographed with the camera in a state in which the illumination device is turned on or in a state in which pattern light is projected from the one or more projection devices or an image of the substrate that is photographed with the one or more obliquely arranged cameras in a state in which the illumination device is turned on,

the one or more openings for the projection devices being arranged at different azimuth directions, as viewed from the point of origin, from azimuth directions of the one or more openings for the obliquely arranged cameras.

12. An inspection apparatus having a camera for photographing a substrate onto which components are soldered from a direction orthogonal thereto,

wherein, taking an intersection of an optical axis of the camera with a substrate conveyed into the inspection apparatus as a point of origin, taking a direction that is parallel to a substrate surface and parallel to a conveyance direction of the substrate as an X-axis, taking a direction that is parallel to the substrate surface and orthogonal to the conveyance direction of the substrate as a Y-axis, taking a direction that is orthogonal to the substrate surface as a Z-axis, taking an angle with respect to the Z-axis as a zenith angle, and taking a direction from the point of origin and within the XY-plane as an azimuth direction, the inspection apparatus comprises:

an illumination device that is configured to illuminate the substrate from all azimuth directions with illumination light whose color or brightness changes stepwise or continuously depending on the zenith angle;

one or more projection devices that are configured to project through one or more openings in the illumination device pattern light onto the substrate from one or more directions that are oblique with respect to the Z-axis;

one or more obliquely arranged cameras that are configured to photograph the substrate through one or more openings in the illumination device from one or more directions that are oblique with respect to the Z-axis;

a processing device that is configured to perform an inspection using an image of the substrate that is photographed with the camera in a state in which the illumination device is turned on or in a state in which pattern light is projected from the one or more projection devices or an image of the substrate that is photographed with the one or more obliquely arranged cameras in a state in which the illumination device is turned on; and

an optical member that is configured to match respective optical axes of the one or more projection devices with respective optical axes of the one or more obliquely arranged cameras,

the openings for the one or more projection devices also serving as the openings for the one or more obliquely arranged cameras.