# US 5,701,661 A · Optical system for mutually positioning a pad carrying member and a multileaded component > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,701,661 A - Document ID: US5701661A - Status: Granted - Kind: A - Application number: 08/537,733 - Filed: 1995-10-12 - Granted: 1997-12-30 - Earliest claimed: 1993-04-14 - Inventors: Hans Gerard van den Brink - Web page: https://patentgrep.com/patent/US5701661A ## CPC - H05K 13/0465: {by soldering (H05K13/0469 takes precedence)} - H05K 13/0812: {the monitoring devices being integrated in the mounting machine, e.g. for monitoring components, leads, component placement} - H05K 13/0818: {Setup of monitoring devices prior to starting mounting operations; Teaching of monitoring devices for specific products; Compensation of drifts during operation, e.g. due to temperature shifts} - Y10T 29/49131: by utilizing optical sighting device - Y10T 29/53091: for work-holder for assembly or disassembly - Y10T 29/53183: Multilead component - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The invention relates to a simple and economic optical system for mutually positioning SMD components having connecting leads and the corresponding pads on pad carrying members with the object of bringing the connecting leads and pads together in one plane through translation or rotation, of positioning them and fixing them. The optical system utilizes a beam splitter, so that it is possible to observe simultaneously with the human eye the spaces in front of and behind the beam splitter. For considerations of robustness the semi-transparent mirror used to this end is evaporated on a transparent substrate which has a finite thickness. A substrate having finite thickness leads to an apparent displacement of the space behind the substrate relative to the space in front of the substrate. The invention relates to the compensation of this displacement by the installation of a compensation plate having identical optical properties in the space over the semi-transparent mirror on the substrate. The semi-transparent mirror is inserted between two optically identical flat substrates. ## Claims ### Claim 1 System for simultaneously observing without parallax a pad carrying member and the corresponding connecting leads of a surface-mounted-device component for the mounting thereof, comprising a beam splitter (3) having a semitransparent mirror (3.2) and two parallel optically identical transparent flat substrates (3.1 and 3.3), each of said transparent flat substrates having first and second opposed and parallel sides, said semitransparent mirror being arranged between and in direct contact with said first sides of said transparent flat substrates, said second sides of said transparent flat substrates being parallel to each other and not in contact with said semitransparent mirror. ### Claim 2 (depends on 1) System as claimed in claim 1, further comprising: means for reproducibly displacing said optical means and thereby permitting the component to be positioned on the pad carrying member. ### Claim 3 (depends on 2) System as claimed in claim 2, further comprising: a lens means comprising one of a magnifier and a binocular microscope. ### Claim 4 (depends on 2) System as claimed in claim 2, further comprising: a lens means comprising at least one high-resolution camera. ### Claim 5 (depends on 1) System as claimed in claim 1, further comprising: a lens means comprising at least one high-resolution camera. ### Claim 6 (depends on 1) System as claimed in claim 1, further comprising: a lens means comprising one of a magnifier and a binocular microscope. ### Claim 7 System for mutually positioning a pad carrying member and the corresponding connecting leads of a multileaded component having a footprint, comprising: a) means for fixing the pad carrying member in a prescribed plane (2); b) means (4.2) for fixing the multileaded component (4.1) with the corresponding connecting leads of the multileaded component located along an imaginary plane (4), wherein said prescribed plane (2) and said imaginary plane (4) define an angle; c) means for rotating the multileaded component relative to the pad carrying member; d) optical means (3) including a semitransparent mirror (3.2) and two parallel optically identical transparent flat substrates (3.1 and 3.3), each of said transparent flat substrates having first and second opposed and parallel sides, said semitransparent mirror being arranged between and in direct contact with said first sides of said transparent flat substates, said second sides of said transparent flat substrates being parallel to each other and not in contact with said semitransparent mirror and said semitransparent mirror located along a third plane which bisects said angle, wherein said prescribed plane (2), said imaginary plane (4), and said third plane defining an axis (1) about which said means for rotating rotates the multileaded component relative to the pad carrying member; and e) lens means (5) directed via the optical means (3) at an angle of .pi./2 relative to the prescribed plane (2) for simultaneously observing both the footprint of the multileaded component and a corresponding section of the pad carrying member. ### Claim 8 (depends on 7) System as claimed in claim 7, further comprising: means for reproducibly displacing said optical means and thereby permitting the component to be positioned on the pad carrying member. ### Claim 9 (depends on 8) System as claimed in claim 8, wherein: said lens means comprises one of a magnifier and a binocular microscope. ### Claim 10 (depends on 8) System as claimed in claim 8, further comprising: a lens means comprising at least one high-resolution camera. ### Claim 11 (depends on 7) System as claimed in claim 7, wherein: said lens means comprises one of a magnifier and a binocular microscope. ### Claim 12 (depends on 7) System as claimed in claim 7, further comprising: a lens means comprising at least one high-resolution camera. ### Claim 13 System for mutually positioning a pad carrying member and a footprint of a component having multiple leads, comprising; a) means for fixing the pad carrying member in a prescribed plane (8); b) optical means (9) including a flat transparent supporting plate (9.3) which is parallel to the prescribed plane, a flat transparent substrate (9.1) which is parallel to the prescribed plane and optically identical to said flat transparent support plate, and a semitransparent mirror coating (9.2) located on said flat transparent substrate (9.1) and between said flat transparent substrate (9.1) and said flat transparent supporting plate (9.3) such that a first distance from the prescribed plane to said semitransparent mirror coating is essentially equal to a second distance from said semitransparent mirror coating to an upper surface of said supporting plate, said upper surface supporting the leads of the component (10.1); c) means for moving the pad carrying member and the component relative to each other, and d) lens means (11) directed at said semitransparent mirror coating (9.2) of the optical means (9) at an angle smaller than .pi./2 for simultaneous observation of both the footprint of the component and a corresponding section of the pad carrying member. ### Claim 14 (depends on 13) System as claimed in claim 13, wherein: said transparent supporting plate is made of quartz. ### Claim 15 (depends on 13) System as claimed in claim 13, wherein: said means for moving comprise means for translating the pad carrying member in two orthogonal directions and component fixing means for fixing and rotating the component. ### Claim 16 (depends on 15) System as claimed in claim 15, further comprising: a lens means comprising at least one high-resolution camera. ### Claim 17 (depends on 13) System as claimed in claim 13, further comprising: means for reproducibly displacing said optical means and thereby permitting the component to be positioned on the pad carrying member. ### Claim 18 (depends on 17) System as claimed in claim 17, wherein: said lens means comprises one of a magnifier and a binocular microscope. ### Claim 19 (depends on 17) System as claimed in claim 17, further comprising: a lens means comprising at least one high-resolution camera. ### Claim 20 (depends on 13) System as claimed in claim 13, wherein: said lens means comprises one of a magnifier and a binocular microscope.