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Fast Automated Projection SYSTEM for Printed Circuit Boards

IP.com Disclosure Number: IPCOM000039779D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 4 page(s) / 33K

Publishing Venue

IBM

Related People

Moore, GW: AUTHOR

Abstract

A double-sided, auto-register, non-artwork projection expose system for use in the production of printed circuit boards and cards is described. The fast automated projection system (FAPS) includes the following functional components which are described in detail later on: 1. Optics head 2, shown in Fig. 1, which contains the Liquid Crystal Light Valve (LCLV) light source and optics, 2. Auto registration system, shown in Fig. 2, which contains quadrant detectors positioner, servo motors, and logic, (Image Omitted) 3. Data handler which contains two controllers for the optics head, a main data handling unit, and the interface to the host computer (if required), shown in Fig. 3, and 4. A material handler for the load/unload operation.

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Fast Automated Projection SYSTEM for Printed Circuit Boards

A double-sided, auto-register, non-artwork projection expose system for use in the production of printed circuit boards and cards is described. The fast automated projection system (FAPS) includes the following functional components which are described in detail later on: 1. Optics head 2, shown in Fig. 1, which contains the Liquid

Crystal Light Valve (LCLV) light source and optics,

2. Auto registration system, shown in Fig. 2, which contains

quadrant detectors positioner, servo motors, and logic,

(Image Omitted)

3. Data handler which contains two controllers for the optics

head, a main data handling unit, and the interface

to the host

computer (if required), shown in Fig. 3, and

4. A material handler for the load/unload operation. The panels to be exposed move from a photoresist laminator to the FAPS unit either by conveyor or by manual means. A materials handler would then place the panel to be exposed into a registration frame. The panel and frame would then be moved into the FAPS expose chamber for auto registration. Auto registration would be performed by the quadrant detector controlled positioning system, shown in Fig. 2. Once the registration was complete in as many points as needed, the panel would be exposed by projected patterns of light controlled by the LCLV. After the expose cycle is complete, the panel would then be removed by a materials handler from the expose chamber and then from the registration frame.

(Image Omitted)

The exposed panel would then move either automatically or by manual means to the rest of the process. Another panel is then operated on, and the steps are repeated until complete. A dummy panel containing bar code information about part number, job number and the number of panels in a particular job would be spliced into the product flow between jobs. A bar code reader on the materials handler would then sense the information and call the correct expose data to the FAPS data handler and would set up the job. A detailed description of the components follows:

1. OPTICS HEAD (Fig. 1)

The LCLV has the ability to change the reflectance of its

surface in discrete areas controlled by a writing

cathode ray tube that exposes the back surface of the LCLV.

Through this method, patterns can be created using the

reflected light. The writing light source and the reflected

(exposing) are independent of each other in regards to

wavelength and power.

1

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The polarizing beam splitter directs the incoming light to the

reflecting surface of the LCLV and its return to the

projection optics.

The projection optics can be tailored to the application in

which the LCLV is to be used. At the present time, the

projection optics are afocal for projection onto targets whose

distance away from the device are not known. High quality

afocal optics would allow the change of panel size to be

performed easily without the change of optics.

Custom opt...