WO1996022673A1 - Verfahren und einrichtung zur dreidimensionalen, berührungslosen vermessung der geometrie von anschlussbeinen bei halbleiter-bauelementen - Google Patents
Verfahren und einrichtung zur dreidimensionalen, berührungslosen vermessung der geometrie von anschlussbeinen bei halbleiter-bauelementen Download PDFInfo
- Publication number
- WO1996022673A1 WO1996022673A1 PCT/DE1995/001772 DE9501772W WO9622673A1 WO 1996022673 A1 WO1996022673 A1 WO 1996022673A1 DE 9501772 W DE9501772 W DE 9501772W WO 9622673 A1 WO9622673 A1 WO 9622673A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor unit
- light
- reflected
- component
- legs
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
- H05K13/08—Monitoring manufacture of assemblages
- H05K13/081—Integration of optical monitoring devices in assembly lines; Processes using optical monitoring devices specially adapted for controlling devices or machines in assembly lines
- H05K13/0813—Controlling of single components prior to mounting, e.g. orientation, component geometry
Definitions
- the invention relates to a method for three-dimensional, contactless measurement of the geometry of semiconductor connecting legs according to the preamble of the main claim. Furthermore, the invention relates to a device for carrying out this method.
- the semiconductor components on the market have different designs.
- the connecting legs of these elements can be arranged in a row on one side of the component, such as, for.
- they can be arranged in two rows, for example in the small outline narrow design, or in four rows on four sides of the component, for example in the Quad Fiat Pack (QFP) design will in this context understood every external contact made of different designs.
- QFP Quad Fiat Pack
- This can be, for example, gull-wing with SOIC or QFP, J-lead with SOJ, PLCC, or metallic hemispheres with BGA. Since these components are precision components, it is particularly important that the dimensions and the geometry of the connecting legs are within the given, very narrow tolerances.
- a three-dimensional measurement must take place.
- the measuring process should be carried out without contact, since the very sensitive connecting legs can easily be damaged.
- Various methods for measuring the geometry of the connecting legs are known. Such a method represents e.g. B. the laser scanning method. Each leg is scanned with a laser beam, and the information of the reflected light is recorded, registered and evaluated by a sensor unit.
- Other methods use either only two-dimensional measurement technology or three-dimensional measurement technology using background lighting or light / shadow projection. Since these methods are carried out in transmitted light, the light source and sensor are located on different sides of the component to be measured. With these methods, the connection legs are measured without contact, but the component must be touched for the purpose of positioning within the measuring device. With this handling, damage to the component, e.g. B. Bending of one or more of the connecting legs cannot be excluded.
- the object of the present invention is to provide a method for specify three-dimensional contactless measurement of the geometry of connection legs in semiconductor components, in which the components remain in the packaging, for example in the tray, during the measurement process and in which the accuracy of the measurement is largely independent of the environmental factors.
- the component to be measured is illuminated from above over a large area and uniformly.
- the measurement results are independent of the surface properties of the components to be measured.
- Two views of the ends of the connecting legs lying in a row and to be measured are simultaneously imaged in a receptacle on a single sensor arrangement. It is immaterial whether the connecting legs of a row in the same plane or z. B. in two, separated by a few millimeters from each other. The two views of the ends of the connecting legs of a row are recorded at one location of each connecting leg by registering the optical data of the light reflected at different angles.
- the background must be dark so that the light reflected from the surface of the illuminated, bright connecting legs can be detected in the sensor unit. This requirement is generally given by the dark material of the trays and can be supported by a suitable arrangement of the light sources, for example by utilizing the shadow from the body of the component.
- the essential components of a measuring device for measuring connecting legs in semiconductor components are: a light source which illuminates the component to be measured from a large area and equals, a sensor unit for detecting and imaging the light reflected from the ends of the connecting legs, and one Evaluation unit for evaluating the recorded optical data.
- the evaluation unit achieves a measuring accuracy that is essentially is higher than the resolution of the sensor unit (e.g. a CCD camera).
- the resolution is in the range of 1/10 to 1/100 pixels. It is the so-called sub-pixel process.
- the special combination of the individual components is important for the invention.
- an optical arrangement for deflecting the reflected light rays is provided for the measuring device.
- the optical deflection arrangement is advantageously formed by optical mirrors. At least one mirror is required for each row of connecting legs. If the light reflected from several rows of the connecting legs is to be imaged on a single sensor unit in a single receptacle, then several mirrors are required (e.g. four rows require at least four mirrors).
- the method and measuring device according to the invention enable the arrangement of all measuring components on one side of the component to be measured at a distance of several millimeters from the component. Therefore, the measuring device can be moved over a tray with components without mechanical collision, or the tray under the measuring device.
- Both the positioning and the measurement can be carried out without touching a component by merely positioning the tray as a whole. Furthermore, it is advantageous that the measurement can be carried out with only one sensor unit, since such an arrangement is inexpensive and the measuring operation is easy to handle. This also results in a low maintenance, adjustment and calibration effort.
- the measuring device works with only one sensor unit, z. B. with only one CCD camera on which both views are imaged in the form of a picture, which by means of an optical arrangement which deflects the beam path of the second view of the end of the connecting leg in such a way that it reaches the sensor unit of the sensor arrangement and is imaged there is made possible.
- the beam paths of the reflected light directed directly to the sensor element and the deflected light are parallel (telecentric image), as already described above.
- a measuring head with a sensor unit, lighting and a Spiegelanordnug with several mirrors, the components being fixed relative to each other, can have a deviation in its positioning to the component by several 0.1 millimeters without affecting the accuracy of measurement. This is only dependent on the constancy of the relative position of the individual components of the measuring head. These can be rigidly connected to one another. The exact mounting of the mirrors in positions determined by the design is not necessary. Rather, the mirrors can be mounted with large tolerances (0.1mm).
- the measuring device After a rigid connection has been established between the optical deflection arrangement (mirrors) and the sensor unit (CCD camera), the measuring device itself can first measure the exact positions and angles of the mirrors using a suitable calibration piece. This takes place in that several image recordings are offset against one another, which, when the measuring head is shifted by a few 0.1 mm each, from one and the same calibration piece (for example exactly measured, rectangular metal plate). All mounting angles and mounting positions of all mirrors can be calculated from the different locations, o the edges of the calibration piece at different positions of the measuring head, according to the known stereometric formulas. After the calibration process, the accuracy is maintained as long as the rigid connection between the mirror and the camera is not released.
- Fig. 1 A sketch that explains the principle of the method.
- FIG. 2 shows a basic sketch of the method with an optical deflection arrangement with two mirrors each.
- Fig. 3 An image in the sensor unit when measuring a component with two rows of connecting legs.
- FIG. 4 shows an image in the sensor unit when measuring a component with four rows of connecting legs.
- Fig. 5 is a schematic diagram of the construction of the measuring head of the measuring device.
- a semiconductor device 1 is shown schematically with two rows of legs arranged on two sides.
- the semiconductor component 1 is illuminated from above by a light source arrangement 9 over a large area.
- the light reflected from the end of each connecting leg 2 is detected by a sensor unit image (K1, K2).
- K1, K2 Only two views of the ends of the connecting legs 2 of a row are necessary in order to measure the row three-dimensionally.
- the figure Kl The first view shows the coordinates x ⁇ y ⁇ , x ⁇ y ⁇ and x ⁇ y- »for the three different connecting legs 2.
- This view shows the xy plane of the connecting legs.
- the second view K2 of the ends of the connecting legs 2 shows the plane xz '.
- the coordinates here are X3Z3 - unc x 1 z ⁇ • D: i - e two beam paths A, B (the first and the second view) run at an angle t to each other.
- the third dimension (z coordinate) is given to each connecting leg
- the schematic diagram explains that a three-dimensional measurement of the same is possible due to the recording and measurement of two views of each connection leg 2 of a row.
- the rays B reflected from the second view of each connecting leg 2 are projected onto the sensor unit 7 by an optical deflection arrangement.
- the first view of the end of the leg is imaged directly on the sensor unit 7 (beam path A) and the second view on the same sensor unit 7 (for example on the same CCD chip) by the reflected light beam B first striking a mirror 3 and it is reflected so that it runs parallel to the first beam path A and strikes the sensor unit 7.
- the image formed on sensor unit 7 in this arrangement of connecting legs is shown in FIG.
- the entire component 1 is shown in the middle of the picture; the two rows of connecting legs 2 are shown to the side of the picture.
- the image of the connecting legs and the Component 1 arises from the direct recording of the reflected beam path A on the sensor unit, the lateral images result from the imaging of the reflected beam path B deflected by the optical deflection arrangement (mirror 3) of the second view of the connecting leg row 2.
- FIG. 4 shows an image of the sensor unit which arises when measuring a component 1 with four rows of connecting legs.
- FIG. 2 shows a possible arrangement in which a component 1 is so large that the exterior mirror views could only be reproduced disadvantageously, and in which such a deflection of the It is possible for the beam path that the optical data of the two views of the connection legs lying on the inside of the sensor unit can be imaged, registered and measured.
- the measuring head has a housing 6, a sensor unit 7 in the form of a CCD camera with a telecentric measuring lens 8, and an evaluation unit 12.
- the housing 6 also serves as a light tube for the light source arrangement 9.
- the light source arrangement 9 has an elongated light source 10 extending in the direction of extension of the tube 6 and a wall 11, which consists, for example, of frosted glass.
- the light source 9 can be formed by individual light bulbs, fluorescent tubes, LEDs or discharge lamps.
- the wall 11 ensures that the luminous bodies form a diffuse light, which measure for the large-area and equally moderate lighting of the component 1 to be measured and its connecting legs 2 is essential.
- the mirrors 3, 4 are also arranged in the housing 6.
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- Engineering & Computer Science (AREA)
- Operations Research (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE1995/001772 WO1996022673A1 (de) | 1995-12-11 | 1995-12-11 | Verfahren und einrichtung zur dreidimensionalen, berührungslosen vermessung der geometrie von anschlussbeinen bei halbleiter-bauelementen |
EP95940165A EP0808554A1 (de) | 1995-12-11 | 1995-12-11 | Verfahren und einrichtung zur dreidimensionalen, berührungslosen vermessung der geometrie von anschlussbeinen bei halbleiter-bauelementen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE1995/001772 WO1996022673A1 (de) | 1995-12-11 | 1995-12-11 | Verfahren und einrichtung zur dreidimensionalen, berührungslosen vermessung der geometrie von anschlussbeinen bei halbleiter-bauelementen |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996022673A1 true WO1996022673A1 (de) | 1996-07-25 |
Family
ID=6918224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1995/001772 WO1996022673A1 (de) | 1995-12-11 | 1995-12-11 | Verfahren und einrichtung zur dreidimensionalen, berührungslosen vermessung der geometrie von anschlussbeinen bei halbleiter-bauelementen |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0808554A1 (de) |
WO (1) | WO1996022673A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6218849B1 (en) | 1997-04-18 | 2001-04-17 | Advantest Corporation | Device for detecting proper mounting of an IC for testing in an IC testing apparatus |
JP2001521140A (ja) * | 1997-10-21 | 2001-11-06 | エルウィン エム ビーティ | 三次元検査システム |
WO2002045136A2 (en) * | 2000-11-28 | 2002-06-06 | Semiconductor Technologies & Instruments, Inc. | Three dimensional lead inspection system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5140643A (en) * | 1989-12-28 | 1992-08-18 | Matsushita Electric Industries Co., Ltd. | Part mounting apparatus with single viewing camera viewing part from different directions |
WO1993019577A1 (de) * | 1992-03-24 | 1993-09-30 | Siemens Aktiengesellschaft | Verfahren zur lageerkennung und/oder teilungsprüfung und/oder koplanaritätsprüfung der anschlüsse von bauelementen und bestückkopf für die automatische bestückung von bauelementen |
US5347363A (en) * | 1991-07-25 | 1994-09-13 | Kabushiki Kaisha Toshiba | External lead shape measurement apparatus for measuring lead shape of semiconductor package by using stereoscopic vision |
-
1995
- 1995-12-11 WO PCT/DE1995/001772 patent/WO1996022673A1/de not_active Application Discontinuation
- 1995-12-11 EP EP95940165A patent/EP0808554A1/de not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5140643A (en) * | 1989-12-28 | 1992-08-18 | Matsushita Electric Industries Co., Ltd. | Part mounting apparatus with single viewing camera viewing part from different directions |
US5347363A (en) * | 1991-07-25 | 1994-09-13 | Kabushiki Kaisha Toshiba | External lead shape measurement apparatus for measuring lead shape of semiconductor package by using stereoscopic vision |
WO1993019577A1 (de) * | 1992-03-24 | 1993-09-30 | Siemens Aktiengesellschaft | Verfahren zur lageerkennung und/oder teilungsprüfung und/oder koplanaritätsprüfung der anschlüsse von bauelementen und bestückkopf für die automatische bestückung von bauelementen |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6218849B1 (en) | 1997-04-18 | 2001-04-17 | Advantest Corporation | Device for detecting proper mounting of an IC for testing in an IC testing apparatus |
JP2001521140A (ja) * | 1997-10-21 | 2001-11-06 | エルウィン エム ビーティ | 三次元検査システム |
WO2002045136A2 (en) * | 2000-11-28 | 2002-06-06 | Semiconductor Technologies & Instruments, Inc. | Three dimensional lead inspection system |
WO2002045136A3 (en) * | 2000-11-28 | 2003-03-27 | Semiconductor Tech & Instr Inc | Three dimensional lead inspection system |
Also Published As
Publication number | Publication date |
---|---|
EP0808554A1 (de) | 1997-11-26 |
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