PREPARATION OF ARTWORK MASTERS

• US 3,668,762 A
• Filed: 10/13/1970
• Issued: 06/13/1972
• Est. Priority Date: 10/13/1969
• Status: Expired due to Term

• Current Assignee: Alfred Charles Clark
• Original Assignee: Alfred Charles Clark
• Inventors: Clark, Alfred Charles
• Primary Examiner(s): Campbell, John F.
• Assistant Examiner(s): Di Palma, Victor A.
• Application Number:
  US05/080,379
• Time in Patent Office: 609 Days
• Field of Search: 29/23B,23P,2P,625,628 156/251,252,510,513,514,515
• US Class Current: 29/238
• CPC Class Codes: H05K 1/116 Lands, clearance holes or other lay-out details concerning the surrounding of a via
• CPC Class Codes: H05K 13/00 Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
• CPC Class Codes: H05K 2203/056 Using an artwork, i.e. a photomask for exposing photosensitive layers
• CPC Class Codes: H05K 3/0002 for manufacturing artworks for printed circuits
• CPC Class Codes: Y10T 156/1054 and simultaneously bonding [e.g., cut-seaming]
• CPC Class Codes: Y10T 156/1056 Perforating lamina
• CPC Class Codes: Y10T 156/12 Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
• CPC Class Codes: Y10T 156/1304 Means making hole or aperture in part to be laminated
• CPC Class Codes: Y10T 156/1313 Cutting element simultaneously bonds [e.g., cut seaming]
• CPC Class Codes: Y10T 29/53678 Compressing parts together face to face
• CPC Class Codes: Y10T 29/53913 Aligner or center

Abstract

There is provided apparatus and method for the preparation of artwork masters used for the manufacture of printed circuit boards. A grid having uniformly spaced perforations onto which a work sheet for the master is applied is used for proper alignment of pressure sensitive pads on the sheet, the pads being applied by a spiked tool adapted to be centered in and by the perforations and press the pads against the sheet. There is also provided a dispenser and running '"'"''"'"''"'"''"'"'conductor'"'"''"'"''"'"''"'"' lines between spaced pads on the work sheet.

Claims

1. Apparatus for use in the accurate positioning of annular pads on a base sheet in the production of printed circuit artwork masters which comprises:

a. a pad applicator comprising a shaft retained in slidable relation by a housing, said shaft having a tapered pointed end and projecting from said housing and adapted to penetrate said base sheet and further adapted to receive and retain an annular pad, said housing providing means surrounding said shaft for pressing an annular pad against the base sheet; and

b. a perforated grid adapted to receive said base sheet in overlying relation, the perforations of said grid adapted to receive and center the tapered end of said shaft.

2. Apparatus as claimed in claim 1 in which the perforations of the grid center the tapered end of said shaft when an annular pad contained on the taper of said shaft is flush with the base sheet.

3. Apparatus as claimed in claim 1 in which the shaft is spring biased within said housing.

4. Apparatus as claimed in claim 3 in which the tapered end of said shaft is of right conical form.

5. Apparatus as claimed in claim 1 in which the perforated grid is supported by a backing adapted to receive the tapered end of said shaft.

6. Apparatus as claimed in claim 5 in which the backing is a foamed plastic.

7. Apparatus as claimed in claim 5 in which the thickness of the foamed plastic backing exceeds the axial length of the tapered portion of the shaft and is contained between the perforated grid and a backing board.