GB2234860A - Stiffening printed circuit boards - Google Patents

Stiffening printed circuit boards Download PDF

Info

Publication number
GB2234860A
GB2234860A GB9012402A GB9012402A GB2234860A GB 2234860 A GB2234860 A GB 2234860A GB 9012402 A GB9012402 A GB 9012402A GB 9012402 A GB9012402 A GB 9012402A GB 2234860 A GB2234860 A GB 2234860A
Authority
GB
United Kingdom
Prior art keywords
board
printed circuit
stiffening strip
circuit board
stiffening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9012402A
Other versions
GB9012402D0 (en
GB2234860B (en
Inventor
Alan David Walker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Services Ltd
Original Assignee
Fujitsu Services Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Services Ltd filed Critical Fujitsu Services Ltd
Publication of GB9012402D0 publication Critical patent/GB9012402D0/en
Publication of GB2234860A publication Critical patent/GB2234860A/en
Application granted granted Critical
Publication of GB2234860B publication Critical patent/GB2234860B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0271—Arrangements for reducing stress or warp in rigid printed circuit boards, e.g. caused by loads, vibrations or differences in thermal expansion
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/14—Mounting supporting structure in casing or on frame or rack
    • H05K7/1461—Slidable card holders; Card stiffeners; Control or display means therefor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/18—Printed circuits structurally associated with non-printed electric components
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/20—Details of printed circuits not provided for in H05K2201/01 - H05K2201/10
    • H05K2201/2009—Reinforced areas, e.g. for a specific part of a flexible printed circuit
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/20—Details of printed circuits not provided for in H05K2201/01 - H05K2201/10
    • H05K2201/2036—Permanent spacer or stand-off in a printed circuit or printed circuit assembly

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Combinations Of Printed Boards (AREA)

Abstract

A printed circuit board is provided with a stiffening strip (14) to increase the rigidity of the board. The stiffening strip consists of a channel-shaped aluminium extrusion, mounted on the board by spacers (15) which hold the strip in spaced- apart relationship with the board, so that it does not interfere with the placement of components (13) on the board. <IMAGE>

Description

Printed Circuit Board Background to the invention This invention relates to printed circuit boards (PCBs).
Complex electronic equipment, such as computer apparatus, is conventionally constructed in the form of a number of PCBs, interconnected by a backplane. Each PCB carries a number of components, such as integrated circuit packages, and has one or more connectors mounted along one edge of the board. These connectors mate with corresponding connectors on the backplane.
In such an arrangement, because of the inherent flexibility of the boards, it may be difficult to mate the connectors accurately. This problem becomes particularly acute if the board is large, or if a number of separate connectors are used on each board.
The object of the present invention is to overcome this problem.
Summary of the invention According to the invention there is provided a printed circuit board having at least one connector along one edge of the board, and having a rigid stiffening strip disposed parallel to said edge of the board, the stiffening strip being mounted on the board by means of spacers which hold the stiffening strip in spaced-apart relationship with the board.
It can be seen that the stiffening strip provides increased rigidity for the board. Moreover, because the strip is mounted in spaced-apart relationship with the board, it does not occupy a significant amount of board area, since components can be mounted underneath the stiffening strip, where necessary.
Brief description of the drawings Figure 1 is a plan view of a printed circuit board.
Figures 2 and 3 are elevational views of the board in the directions of arrows II and III in Figure 1.
Description of an embodiment of the invention One printed circuit board (PCB) in accordance with the invention will now be described by way of example with reference to the accompanying drawings.
The PCB 10 has three connectors 11 mounted along the rear edge 12 of the board. In use, these connectors mate with corresponding connectors (not shown) on a backplane, so as to form the required electrical connections between the board and the backplane. The PCB carries a number of integrated circuit components 13, only some of which are shown for simplicity.
The PCB carries a stiffening strip 14, consisting of an aluminium extrusion of U-shaped or channel-shaped section. The stiffening strip is mounted on the PCB, parallel to the rear edge 12, by means of spacers 15 which are press-fitted into holes in the strip 14 and in the PCB 10. The spacers 15 may be standard stand-off pins which are conventionally used to attach PCB sub-assemblies to a motherboard.
It can be seen that the spacers 15 hold the stiffening strip 14 in a spaced-apart relationship with the board, so that it does not significantly interfere with the placement of components on the board. In particular, components 13 can be mounted, where necessary, under the strip 14. In other words, the stiffening strip effectively does not occupy any significant area on the board, and does not substantially reduce the area of the board available for mounting components.

Claims (6)

1. a printed circuit board having at least one connector along one edge of the board, and having a rigid stiffening strip disposed parallel to said edge of the board, the stiffening strip being mounted on the board by means of spacers which hold the stiffening strip in spaced-apart relationship with the board.
2. A printed circuit board according to claim 1 wherein said stiffening strip has a channel-shaped cross section.
3. A printed circuit board according to claim 1 or 2 wherein said stiffening strip is an aluminium extrusion.
4. A printed circuit board according to any preceding claim wherein components are mounted on the board under the stiffening strip.
5. A printed circuit board according to any preceding claim having a plurality of connectors along said edge of the board.
6. A printed circuit board substantially as hereinbefore described with reference to the accompanying drawings.
GB9012402A 1989-08-08 1990-06-04 Printed circuit board Expired - Fee Related GB2234860B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB898918090A GB8918090D0 (en) 1989-08-08 1989-08-08 Printed circuit board

Publications (3)

Publication Number Publication Date
GB9012402D0 GB9012402D0 (en) 1990-07-25
GB2234860A true GB2234860A (en) 1991-02-13
GB2234860B GB2234860B (en) 1992-11-18

Family

ID=10661325

Family Applications (2)

Application Number Title Priority Date Filing Date
GB898918090A Pending GB8918090D0 (en) 1989-08-08 1989-08-08 Printed circuit board
GB9012402A Expired - Fee Related GB2234860B (en) 1989-08-08 1990-06-04 Printed circuit board

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB898918090A Pending GB8918090D0 (en) 1989-08-08 1989-08-08 Printed circuit board

Country Status (1)

Country Link
GB (2) GB8918090D0 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175942A1 (en) * 1984-09-03 1986-04-02 Siemens Aktiengesellschaft Frame for receiving slidable electrical equipments

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175942A1 (en) * 1984-09-03 1986-04-02 Siemens Aktiengesellschaft Frame for receiving slidable electrical equipments

Also Published As

Publication number Publication date
GB9012402D0 (en) 1990-07-25
GB2234860B (en) 1992-11-18
GB8918090D0 (en) 1989-09-20

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20030604