Apparatus for inspecting configuration of terminal legs of an electronic device

• US 4,739,175 A
• Filed: 02/20/1987
• Issued: 04/19/1988
• Est. Priority Date: 02/24/1986
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Tamura, Keiichi
• Primary Examiner(s): Westin, Edward P.
• Application Number:
  US07/016,732
• Time in Patent Office: 424 Days
• Field of Search: 250/561, 250/223 R, 250/224, 29/566.3, 29/705, 29/709, 29/710, 29/741, 356/241, 356/375
• US Class Current: 250/559.34
• CPC Class Codes: H05K 13/0813 Controlling of single components prior to mounting, e.g. orientation, component geometry H05K13/0812 takes precedence
• CPC Class Codes: Y10T 29/515 to trim electric component

Abstract

An apparatus for inspecting the configuration of terminal legs of an electronic device comprises a support base for supporting the electronic device to be inspected and a distance sensor, disposed at a predetermined distance from the electronic device, for measuring the distance to a particular point on a predetermined path across the terminal legs of the electronic device by a beam of light. The distance sensor provides an output signal representative of the distance between the sensor and the point on the predetermined path across the terminal legs. The apparatus also comprises drive mechanism for moving the distance sensor and the electronic device relative to each other at a predetermined speed along the predetermined travel path, thereby to move the beam of light across the terminal legs of the electronic device to be inspected so that the distance sensor can provide an output signal indicative of a measured profile of the terminal legs of the electronic device along the predetermined path. The apparatus further comprises a signal processing circuit including a reference signal generator for generating a reference signal representative of a desired reference profile of the terminal legs of the electronic device along the predetermined path. In order to determine whether or not the terminal legs of the electronic device being inspected are deformed as indicated by any discrepancy between the measured profile and the reference profile, a determination circuit is connected to the distance sensor and the reference signal generator for comparing the measured profile of the terminal legs with the reference profile of the terminal legs.

Claims

1. An apparatus for inspecting the configuration of terminal legs of an electronic device, comprising:

means for supporting the electronic device to be inspected at a predetermined position;

distance sensor means, disposed at a predetermined distance from the electronic device, for measuring the distance to a particular point on a predetermined travel path across the terminal legs of the electronic device by a beam of light, said distance sensor means providing an output signal representative of the distance between the sensor and the point on said predetermined travel path across the terminal legs;

drive means for providing a relative movement between said distance sensor means and the electronic device at a predetermined speed along said predetermined travel path, thereby to move the beam of light across the terminal legs of the electronic device to be inspected so that said distance sensor provides an output signal indicative of a measured profile of the terminal legs of the electronic device along said predetermined path; and

signal processing means including reference signal generating means for generating a reference signal representative of a reference profile of the teminal legs of the electronic device along said predetermined path, and a determination circuit connected to said distance sensor means and said reference signal generating means for comparing said measured profile of the terminal legs with said reference profile of the terminal legs to determine whether or not the terminal legs of the electronic device being inspected are deformed based on any discrepancy between said measured profile and said reference profile.

2. An apparatus as claimed in claim 1, wherein said signal processing means comprises means for comparing the amplitude of the output from said distance sensor means with the amplitude of the reference signal for determining whether or not the terminal legs of the electronic device are positioned at a predetermined distance from said distance sensor, and means for comparing the interval of the change of the amplitude of the output from said distance sensor means with that of the reference signal to determime whether or not the terminal legs of the electronic device are positioned at a predetermined distance from each other.

3. An apparatus as claimed in claim 1, wherein said drive means is a stepping motor connected to a pulse generator circuit, and said interval comparing means comprises a leading edge detection circuit connected to said distance sensor for detecting the leading edge of the rectangular waveform of said output from said distance sensor and providing an output indicative of the time point of the occurence of the leading edge, a pulse counting circuit connected to said leading edge detection circuit and said pulse generator circuit for counting the number of the reference pulses from said pulse generator circuit between two consecutive leading edges of the output from said distance sensor, and a pulse comparison circuit connected to said pulse counting circuit for comparing the output from said pulse counting circuit with a reference pulse signal.