GB2237689A - Circuit structure for electronic calculator - Google Patents

Circuit structure for electronic calculator Download PDF

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Publication number
GB2237689A
GB2237689A GB8924771A GB8924771A GB2237689A GB 2237689 A GB2237689 A GB 2237689A GB 8924771 A GB8924771 A GB 8924771A GB 8924771 A GB8924771 A GB 8924771A GB 2237689 A GB2237689 A GB 2237689A
Authority
GB
United Kingdom
Prior art keywords
board
circuit
calculator
electronic components
circuit structure
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.)
Withdrawn
Application number
GB8924771A
Other versions
GB8924771D0 (en
Inventor
L Chun Wu
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB8924771A priority Critical patent/GB2237689A/en
Publication of GB8924771D0 publication Critical patent/GB8924771D0/en
Publication of GB2237689A publication Critical patent/GB2237689A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/50—Fixed connections
    • H01R12/59—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures
    • H01R12/62—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures connecting to rigid printed circuits or like structures
    • 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
    • H05K1/14—Structural association of two or more printed circuits
    • H05K1/148—Arrangements of two or more hingeably connected rigid printed circuit boards, i.e. connected by flexible means
    • 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
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/36—Assembling printed circuits with other printed circuits
    • H05K3/361—Assembling flexible printed circuits with other printed circuits
    • 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
    • H05K1/09—Use of materials for the conductive, e.g. metallic pattern
    • 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
    • H05K1/09—Use of materials for the conductive, e.g. metallic pattern
    • H05K1/092—Dispersed materials, e.g. conductive pastes or inks
    • H05K1/095—Dispersed materials, e.g. conductive pastes or inks for polymer thick films, i.e. having a permanent organic polymeric binder
    • 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
    • H05K2201/03—Conductive materials
    • H05K2201/032—Materials
    • H05K2201/0323—Carbon
    • 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
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10053—Switch
    • 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
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10128—Display
    • H05K2201/10136—Liquid Crystal display [LCD]

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Calculators And Similar Devices (AREA)
  • Structure Of Printed Boards (AREA)

Abstract

A circuit structure for a calculator comprises a keyboard contact board (2) and a circuit board (3) for electronic components (31-33), the keyboard contact board being printed with a circuit (21) for contact signal entry from the keys (41) of a keyboard (4) and being connected with the circuit of the circuit board (3) by means of a ribbon line (22). The board 3 may be connected to display means (5) by a further ribbon line (23). The keyboard contact board is made of Bakelite (R.T.M.) board coated with conductive carbon cement to eliminate pollution during production Each ribbon line is made of PE film coated with aluminum bus lines. <IMAGE>

Description

INNOVATIVE CIRCUIT STRUCTURE FOR CALCULATOR This invention relates to an innovative circuit structure for calculator.
Conventional calculator PC board is a doublesided copper laminated board having a keyboard contact control circuit made on one side, and another circuit layer made on the other side for welding thereto of electronic component parts. Although it minimizes space consumptIon, the cost of which is stil expensive.
Because the front panel of a calculator Is freuently changed to satIsfy consumers, the arrangement of the keys of the keyboard shall be changed accordIngy.
consequence, the internal circuit structure rust be changed too. Therefore, electronic calculator manufacturers normally start production against crder, so as to prevent from encountering poor sales or unserviceable PC board inventory. According to this conventional method, it is rather difficult to cath the fashion because the process from materla orcerlng, production line arrangement, to further production and cistributlon it can not be made Within short period.
Therefore, when a new item is produced, market demand may have been changed. Because of high instability of market situation, people on production line shall have to be flexibly arranged and it will consequently increase the production cost.
Further, according to conventional method, the connection between LCD and PC board is made by means a PE film based carbon cement bus lines coated w th Isomeric heat melting glue. Because carbon cement produces high resistance and low extensibility, the conventional ribbon line is easy to break during service. Further, P film tends to deform during gluing process, because the process must be made under high temperature condition, to interfere with the positIonIng of the bus Ines to further affect the quality in connection.
It is therefore, an object of the present inventIon to provide such a new circuit board structure for calculator which is separately comprised of a keyboard contact board and a circuit board for electronic components practlca' for standardized mass production to simplify production process, rninmlze tirre and material consumption and reduce production cost.
In accordance with the present invention there is provided a new circuit board structure for calculator which makes maintenance and quality control easy.
Preferably there may be provided a new circuit board structure for calculator wherein the ribbon line for connection to LCD Is made by coating one layer of aluminum foil over a PE film for further cnem-cal itching process to produce aluminum conductor lines, which conductor lines are fryer coated with one layer of isomeric neat melting gue to form a ribbon line havIng property of high conduotivity and extensibility.
There may also be a new circuit board structure wherein the keyboard contact board does not have any electronic components welded thereto and is generally (R.T.M.) comprised of a Bakelite / board processed through punching, carbon cement ink printing. through-hole carbon cement ink filling, drying and board cutting process to eliminate pollution makIng or reduce the cost.
The above and other objects, features and advantages of the present invention will become fully understood from the following detailed description considered in connection with the annexed drawings in which: Fig. 1 is a perspective schematic drawing illustrating the internal structure of a conventional calculator; Fig. 2 is a perspective schematIc drawing illustrating an embodiment according to the present invention; Fig. 3 is a perspective schematIc drawIng illustrating another embodiment according to the present invention; Fig. 4 Is a flow chart illustrating the connection of ribbon line according to the prior art; Fig. 5 is a flow crt illustrating the connection of ribbon line according to the present invention;; Fig. 6 is a flow chart illustrating the production of PC board according to prior art; Fig. 7 is a flow chart illustrating the production of PC board according to the present invention.
Referring to Fig. 1, conventional calculator PC board 1 is a double-sided copper laminated board having a keyboard contact control circuit 11 made on one side, and another circuit layer 12 made on the other side for welding thereto of electronic component parts 121, 122, 123 etc. Because keyboard contact control circuit 11 and electronic component circuit 12 are both made on the same board 1, when the front pane of a calculator is changed in style, the whole PC board circuit must be revised agaIn. Therefore, the cld PC boards become unservIceable and useless.
Referring to Figs. 4 and 5, the circuit board port on according to the present invention is separately comprised of a keyboard contact board 2 and a circuit hoard for electronic components 3, wherein the keyboard contact board 2 is coated with a circuit 21 for contact signal entry from the keys 41 of a keyboard 4 and respectively connected with the circuit of the circuit board for electronic components 3 by means of ribbon line to further connect to LCD 5 by means of further ribbon line 23 or contact points 24; and the circuit board for electronic components 3 is having all the necessary electronic components 31, 32, 33 welded thereto.Through the said arrangement to match with other component parts, a practical calculator according to the present invention is thus completed.
Please refer to Figs. 4 and 5 which illustrate the connection of a LCD to a PC board through ribbon llne according to conventIonal method. According to conventional method, a rlbbon line is made by covering é layer isomerlc heat meltIng glue coating over a FE film based carbon cement ribbon line. Because carbon cement must be hardened under high temperature process, the P base may be deformed to deteriorate the precision of ribbon line gluing. In order to solve the problem, it is designed to coat one aye of aluminum foil over a FE film for further chemical itching process to produce conductor lines. After the conductor lines are covered with one layer of isomeric heat melting glue, a ribbon line according to the present Invention Is thus completed. A ribbon line produced according tc the present invention provIdes not only good conductivity and extensibility, it also eliminates the problem of deformation of PE film caused during high temperature hardening process because the process to coat one layer of aluminum foil coating over PE film can be made under ambient temperature.
Referring to Figs. 6 and 7, the keyboard contact board 2 of the present invention is for contact control and does not have any electronic components welded thereto. According to conventional method, a PC board In order for mounting thereon of electronic components, is made through copper laminating (see Fig.
5), drilling, through-hole plating, negative circuit Srq ting, secondary plating, deinklng, itching, painting, and board cutting process. The complicated production process is time and material consuming and, n consequence, it makes the cost high. Further, during through-hole plating, secondary platIng, delnking and chemical itching process, pollution is directly produced. According to the present inventIon, the keyboard contact board 2 does not have any electronic components welded thereto, of which the production process is made as illustrated in Fig. 6. A Bakel-te (t -? board is processed through punching, carbon cement ink printing, through-hole carbon cement ink filling, drying and board cutting to form a keyboard contact board 2. According to the present Invention, the production process for keyboard contact board 2 is sImplifIed, In which material and time consumption is minimized. In consequence, the cost of keyboard contact board 2 is minimized. The present invention is most suItable for the production of keyboard contact board which requires high flexibility.
In conclusion, the present ivetio is to provIde such a circuit structure for calculator wi is Inexpensive to manufacture, practical in use and eliminates pollution during productIon.

Claims (5)

CLAIMS:
1. A circuit structure for calculator comprised of a keyboard contact board and a circuit board for electronic components, said keyboard contact board beIng printed with a circuit for contact signal entry from the keys of a keyboard and respectively connected with the circuit of sald cIrcuit board for electronic components by means of ribbon line to further connect to LCD by means of further ribbon line, safd circuit board for electronic components having all the necessary electronic components welded thereto to form an internal circuit structure for a calculator.
2. The circuit structure for calculator according to claim 1, wherein said keyboard contact board is generally comprised of a Bakelite (RTM) board processed through punching, carbon cement Ink prIntIng, through-hole carbon cement ink filling, drying and board cutting process.
3. the circuit structure for calculator according to claim I or 2, wherein said ribbon line is made by coating one layer of aluminum foil over a PE film for further chemical itching process to produce aluminum conductor lines, which conductor lines are further coated with one layer of isomeric heat melting glue to form a ribbon line having property of high conductivity and extensibility.
4. The circuit structure for calculator according to claim 1, wherein said circuit board for electronic components is connected with LCD by means of contact control.
5. A circuit structure for a calculator substantially as hereinbefore described with reference to, as illustrated in, Fig. 2; or Fig. 3; or Fig. 5; or Fig. 7 of the accatpanying drawings.
GB8924771A 1989-11-02 1989-11-02 Circuit structure for electronic calculator Withdrawn GB2237689A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8924771A GB2237689A (en) 1989-11-02 1989-11-02 Circuit structure for electronic calculator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8924771A GB2237689A (en) 1989-11-02 1989-11-02 Circuit structure for electronic calculator

Publications (2)

Publication Number Publication Date
GB8924771D0 GB8924771D0 (en) 1989-12-20
GB2237689A true GB2237689A (en) 1991-05-08

Family

ID=10665628

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8924771A Withdrawn GB2237689A (en) 1989-11-02 1989-11-02 Circuit structure for electronic calculator

Country Status (1)

Country Link
GB (1) GB2237689A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780430A (en) * 1972-09-25 1973-12-25 Bowmar Ali Inc Process for mounting electro-luminescent displays
US4141075A (en) * 1976-04-19 1979-02-20 Texas Instruments Incorporated Method of making an electronic calculator
GB1572962A (en) * 1977-05-06 1980-08-06 Triumph Werke Nuernberg Ag Electronic calculators
GB2076227A (en) * 1980-05-19 1981-11-25 Burr Brown Res Corp Housing packs for electronic devices
GB2148056A (en) * 1983-09-30 1985-05-22 Matsushita Electric Works Ltd Expandable modular sequence control system
GB2191896A (en) * 1986-03-25 1987-12-23 Dowty Electronic Components Interconnection systems for electrical circuits

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780430A (en) * 1972-09-25 1973-12-25 Bowmar Ali Inc Process for mounting electro-luminescent displays
US4141075A (en) * 1976-04-19 1979-02-20 Texas Instruments Incorporated Method of making an electronic calculator
GB1572962A (en) * 1977-05-06 1980-08-06 Triumph Werke Nuernberg Ag Electronic calculators
GB2076227A (en) * 1980-05-19 1981-11-25 Burr Brown Res Corp Housing packs for electronic devices
GB2148056A (en) * 1983-09-30 1985-05-22 Matsushita Electric Works Ltd Expandable modular sequence control system
GB2191896A (en) * 1986-03-25 1987-12-23 Dowty Electronic Components Interconnection systems for electrical circuits

Also Published As

Publication number Publication date
GB8924771D0 (en) 1989-12-20

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)