JPH09222310A - Device for inspecting bend of lead wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inspect any upward or downward bend of a lead wire by irradiating the lead wire held in the specified attitude with lights with wavelengths different from each other from different directions. SOLUTION: A first illuminating means 9 emits a red light 7 to an inner lead held in the specified attitude on a tape 1 from a first direction. A second illuminating means 13 emits a blue light 11 with a second wavelength to the inner lead from a second direction different from the first direction. A color TV camera 15 picks up both red and blue lights reflecting at the same time on the inner lead. When the inner lead has any curvature, the TV camera 15 becomes sensitive to the red light and weak in the blue light, that is, the balance of light reception intensity in the TV camera 15 is changed. Therefore, the presence or absence of bend of the inner lead can be judged by observing the change in balance through the TV camera 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting lead wires such as lead frames and inner leads for TAB for bending (bows and jumps).

[0002]

Prior Art and Problems to be Solved by the Invention FIG.
As shown in, the lead frame and the inner lead 2 for TAB are cantilevered and have a structure that is easily bent. Then, as shown in FIG. 7, if the inner lead 1 is bent upward or downward, a problem occurs when the inner lead is connected to the surface electrode 5 of the semiconductor chip 3.

Therefore, an object of the present invention is to provide an apparatus for inspecting the presence or absence of bending of lead wires such as inner leads upward or downward.

[0004]

In order to achieve this object, a lead wire bending inspection apparatus according to a first aspect of the present invention applies light of a first wavelength to a lead wire held in a fixed posture. A first irradiating means for irradiating from a first direction and a second irradiating means for irradiating the lead wire with light of a second wavelength different from the first wavelength from a second direction different from the first direction. And an observing means for simultaneously observing the first and second light emitted by the first and second irradiating means and simultaneously reflected from the lead wire.

The lead wire bending inspection apparatus according to the second aspect of the present invention includes a light irradiating means for irradiating the lead wire, which is held in a fixed posture, with light from a fixed direction. An observation means for observing the light reflected by the lead wire from a fixed direction is provided.

A lead wire bending inspection apparatus according to a third aspect of the present invention includes a light irradiating means for irradiating a lead wire, which is held in a fixed posture and moves in a fixed direction, with light from a fixed direction. Light emitted by this and photoelectrically converted by the lead wire is photoelectrically converted, and a one-dimensional sensor arranged in a direction perpendicular to the moving direction is provided.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 is a schematic view showing an inner lead bending inspection apparatus according to a first embodiment of the present invention. As shown in the figure, this inspection apparatus has a first irradiation means 9 for irradiating the inner lead on the TAB tape 1 held in a fixed posture with red light 7 from a first direction.
A second irradiating means 13 for irradiating the inner lead with blue light 11 having a second wavelength from a second direction different from the first direction, and the first and second irradiating means. A color TV camera 15 is provided for simultaneously observing the red and blue light emitted from the inner leads 9 and 13 and reflected by the inner leads.

In this structure, when the inner lead 2 is bent as shown in FIG. 2, the intensity of light incident on the TV camera 15 is such that the red light 7 is strong and the blue light 11 is weak. The balance of the received light intensity of the red light and the blue light by the camera 15 changes. Therefore, by observing this change in balance through the TV camera 15, it is possible to inspect whether or not the inner lead is bent. (Second Embodiment) FIG. 3 is a schematic view showing an inner lead bending inspection apparatus according to a second embodiment of the present invention. As shown in the figure, this inspection apparatus includes a light irradiating means 19 for irradiating the inner lead on the TAB tape 1 held in a certain posture with light 17 from a certain direction, and the inner irradiating means 19 for irradiating the inner lead. A black and white TV camera 2 for observing the light reflected by the leads from a certain direction.
1 is provided.

In this structure, when the inner lead 2 is bent as shown in FIG. 4, the intensity of light incident on the TV camera 21 changes depending on the bending direction. Therefore, by observing this intensity change through the TV camera 21, it is possible to inspect whether or not the inner lead is bent. (Third Embodiment) FIG. 5 is a schematic diagram showing a bending inspection device for an inner lead according to a third embodiment of the present invention. As shown in the figure, the inspection apparatus is a light irradiating means 27 for irradiating the inner lead on the TAB tape 1 which is held in a fixed posture and moves in a fixed direction 23 with light 25 from a fixed direction. A one-dimensional TV camera 31 having a one-dimensional sensor arranged in a direction perpendicular to the moving direction is provided while photoelectrically converting the light 29 that is irradiated by this and is regularly reflected by the inner lead. In this case, the device is arranged so that the plane including the light 25 and its regular reflection light 29 and the traveling direction 23 of the inner lead are substantially parallel to each other.

In this structure, if the inner lead on the TAB tape 1 is bent, the intensity of the regular reflection light 29 incident on the one-dimensional TV camera 31 is reduced. Therefore,
Whether or not the inner lead is bent can be inspected based on the light intensity of the regular reflection light 29 obtained by the one-dimensional sensor.

[0011]

As described above, according to the present invention, the bending of the lead wire can be inspected with a simple structure.

[Brief description of drawings]

FIG. 1 is a schematic view showing a bending inspection device for an inner lead according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining the operation of the apparatus of FIG.

FIG. 3 is a schematic diagram showing a bending inspection device for an inner lead according to a second embodiment of the present invention.

FIG. 4 is a schematic diagram for explaining the operation of the apparatus of FIG.

FIG. 5 is a schematic view showing a bending inspection device for an inner lead according to a third embodiment of the present invention.

FIG. 6 is a schematic diagram showing a structure of an inner lead.

FIG. 7 is a schematic diagram for explaining a problem due to bending of an inner lead.

[Explanation of symbols]

1: TAB tape, 2: inner lead, 3: semiconductor chip, 5: surface electrode, 7: red light, 9: first irradiation means, 11: blue light, second irradiation means 13, 15: color TV camera , 17: light, 19: light irradiation means, 21: black and white TV camera, 25: light, 29: specular reflection light, 31: one-dimensional TV camera.

Claims (3)

[Claims] 1. A first irradiation means for irradiating a lead wire, which is held in a fixed posture, with light of a first wavelength from a first direction, and the lead wire having the first wavelength. Second irradiation means for irradiating light of a different second wavelength from a second direction different from the first direction, and irradiation by the first and second irradiation means and simultaneously reflected from the lead wire. An apparatus for inspecting bending of a lead wire, comprising: an observing means for observing the first and second lights at the same time. 2. A light irradiating means for irradiating a lead wire, which is held in a certain posture, with light from a certain direction, and observing the light radiated by the light emitting means and reflected by the lead wire from a certain direction. An apparatus for inspecting bending of a lead wire, comprising: an observing means. 3. A light irradiating means for irradiating a lead wire, which is held in a certain posture and moves in a certain direction, with light from a certain direction, and light which is radiated by the light emitting means and specularly reflected by the lead wire. A lead wire inspection apparatus comprising: a one-dimensional sensor that is photoelectrically converted and is arranged in a direction perpendicular to the moving direction.