GB2062304A - Key Input Device for Electronic Timepiece Calculator - Google Patents
Key Input Device for Electronic Timepiece Calculator Download PDFInfo
- Publication number
- GB2062304A GB2062304A GB8032375A GB8032375A GB2062304A GB 2062304 A GB2062304 A GB 2062304A GB 8032375 A GB8032375 A GB 8032375A GB 8032375 A GB8032375 A GB 8032375A GB 2062304 A GB2062304 A GB 2062304A
- Authority
- GB
- United Kingdom
- Prior art keywords
- holes
- elastic sheet
- input device
- watch case
- key input
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/78—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites
- H01H13/785—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites characterised by the material of the contacts, e.g. conductive polymers
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B37/00—Cases
- G04B37/08—Hermetic sealing of openings, joints, passages or slits
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
- G04C3/001—Electromechanical switches for setting or display
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G9/00—Visual time or date indication means
- G04G9/0064—Visual time or date indication means in which functions not related to time can be displayed
- G04G9/007—Visual time or date indication means in which functions not related to time can be displayed combined with a calculator or computing means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/78—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites
- H01H13/80—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites characterised by the manner of cooperation of the contacts, e.g. with both contacts movable or with bounceless contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2201/00—Contacts
- H01H2201/002—Contacts bounceless
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2201/00—Contacts
- H01H2201/022—Material
- H01H2201/032—Conductive polymer; Rubber
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2219/00—Legends
- H01H2219/002—Legends replaceable; adaptable
- H01H2219/01—Liquid crystal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2221/00—Actuators
- H01H2221/002—Actuators integral with membrane
- H01H2221/006—Adhesive
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2223/00—Casings
- H01H2223/002—Casings sealed
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2231/00—Applications
- H01H2231/028—Watch
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Push-Button Switches (AREA)
- Electric Clocks (AREA)
- Calculators And Similar Devices (AREA)
Abstract
A key input device for an electronic timepiece-cum-calculator comprises a wristwatch case (11) with a plurality of through holes (19) arranged in a matrix, a circuit board (28) inside the case (11) and having switching contacts (28a) in correspondence with said through holes (19), and an elastic sheet (21) arranged on the outer side of the case (11) and having conductive bodies (21a) each of which is inserted through one of said through holes (19) so that a switching operation is effected by depressing one of said conductive bodies (21a) toward the corresponding contact (28a). The periphery of said elastic sheet (21) is so constructed as to achieve water- tightness. As shown the sheet (21) is held by a plate (22) having holes (23) for key portions (21c) of the sheet and attached to the case by screws (24). <IMAGE>
Description
SPECIFICATION
Key Input Device for Electronic Timepiece
Calculator
The present invention relates to a key input device for an electronic timepiece calculator.
Electronic wristwatches have recently become commercially available which have stopwatch, alarm and calculation functions. However, with these types of electronic wristwatches, the number of various operation switches is great so that the construction becomes complex and the price become high when each individual switch is made waterproof.
Accordingly, in an electronic wristwatch of this type, it has been proposed to make various operation switches with an elastic sheet having movable contact parts for attaining the watertightness of the switches as in the case of the keyboard of compact electronic calculators or the like.
Fig. 1 shows a conventional electronic wristwatch which attempts to attain watertightness with an elastic sheet wherein numeral 1 denotes a wristwatch case; 2, a watch crystal; 3, a decorative panel of a keyboard part; and 4, key tops. The key tops 4 cover through holes formed at the top surface of the watch case 1 and the decorative panel 3. Numeral 5 denotes a waterproof elastic sheet of electrically conductive rubber or the like, the periphery 5b of which is clamped between the inner surface of the watch case 1 and the watch module. The parts of the elastic sheet 5 corresponding to the key tops 4 protrude upwardly. Movable contacts 5a are formed integrally with and protrude from the lower surfaces of the protruding parts of the elastic sheet 5.Numeral 6 denotes a circuit board having a stationary contacts (not shown) corresponding to the movable contacts 5a. The circuit board 6 constitutes a watch module as attached to a frame body 7 of synthetic resin.
Numeral 8 denotes a display panel (e.g., a liquid crystal display panel); 9, an interconnector; and 10, a panel press plate.
The periphery 5b of the elastic sheet 5 is clamped between the inner surface of the watch case 1 and the frame body 7 of the watch module. The switch mechanism is so constructed that when the key tops 4 are depressed, the protruding parts of the elastic sheet 5 are depressed and the movable contacts 5a connect with the stationary contacts for attaining watertightness of the switches with the elastic sheet 5. With this arrangement, the construction may be made simpler, the watertightness may be improved, and the product price may be vastly reduced in comparison with those devices in which the respective key tops 4 are individually sealed for watertightness.
However, with the electronic wristwatch shown in Fig. 1, the elastic sheet 5 is clamped between the watch case 1 and the frame body 7 of the watch module, and the periphery of the elastic sheet 5 and the inner surface of the watch case 1 contact each other in a watertight manner so that water tends to leak through the contact part between the watch case 1 and the elastic sheet 5. Furthermore, for mounting the watch module, the periphery 5b of the elastic sheet 5 must be clamped with sufficient force and in uniform manner so that assembly becomes inconvenient.The electronic wristwatch has been further defective in that the pressing force of the elastic sheet 5 becomes gradually smaller so that water might leak through the area of contact between the watch case 1 and the periphery 5b of the elastic sheet 5 when the top keys 4 are depressed and the movable contacts 5a of the elastic sheet 5 are depressed toward the stationary contacts of the watch module side.
The present invention has been made to overcome these problems and has for its object to provide an electronic timepiece calculator having a key input device, with which the watertightness is excellent, the construction is simple, and the operation is easy.
To the above and other ends, the present invention provides a key input device for an electronic timepiece calculator characterized by comprising a watch case with a plurality of coplanar through holes; switch terminals each arranged in correspondence to said respective through holes; and a watertight elastic sheet having a flat plate arranged at the outer face of said watch case and covering said plurality of through holes and movable contacts each inserted in said plurality of through holes.
With a key input device for an electronic timepiece calculator of the above construction in accordance with the present invention, it is not necessary to press the elastic sheet with the watch module. Thus, the problems presented with the conventional devices are eliminated, i.e., the complex procedure required for mounting the watch module and the degradation of the watertightness when the key tops are depressed.
Furthermore, the arrangement of the elastic sheet at the upper surface of the watch case results in better watertightness and simpler mounting of the elastic sheet.
This invention can be more fully understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:
Fig. 1 is a partial sectional view of a key input device of a conventional wristwatch;
Fig. 2 is a front view of an electronic wristwatch of the present invention;
Fig. 3 is a sectional view along the line Ill-Ill of Fig. 2;
Fig. 4 is an exploded, partial sectional view of
Fig. 2;
Fig. 5 is a front view of an electronic vvristwatch in accordance with another embodiment of the present invention;
Fig. 6 is a vertical sectional view along the line VI--VI of the electronic wristwatch of Fig. 5;
Fig. 7 is a partial enlarged view of the key input unit shown in Fig. 6; and
Fig. 8 is a view illustrating the key tops of Fig. 7 under depressed condition.
An embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 2 is a front view of an electronic timepiece calculator of the present invention. Numeral 11 denotes a metal watch case; 12, a display unit; 13, a watch crystal which covers the display unit; and 14, a keyboard arranged next to the display unit 12 on the watch case 11. The keyboard 14 is covered with a decorative panel 15 on which are printed numerals and a + symbol. Key tops 16 including an addition command key which functions as a registering key and an equal key are included on the keyboard 14. Numeral 1 7a denotes addition, multiplication and subtraction keys; and 17b denotes a swiching key for switching between the calculation function and watch function. These keys 1 7a and 1 7b are disposed at the side face of the watch case 11.
Symbols;, x, -, w/c and so on indicating the functions of the respective keys are printed in the vicinity of the keys 1 7a and 1 7b of the watch case 11. Fig. 3 is a sectional view along the line Ill-Ill of Fig. 2, and Fig. 4 is an exploded view of
Fig. 3. A recess 18 is formed at a part of the watch case 11 where the keyboard 14 is to be formed. Through holes 19 corresponding to the key tops 16 are formed at the bottom surface 18a of the recess 18. An annular groove 20 is formed along the periphery of the recess 18 surrounding the part for forming the through holes 19.
Tapered surfaces 19a are formed in the upper parts of the through holes 19 so that the holes open wider toward the top. Numeral 21 denotes an elastic sheet of watertight material such as an electrically conductive rubber. Movable contacts 21 a are formed integrally with and protrude from the elastic sheet 21, extending through the through holes 19. An annular projection 21 b is integrally formed with the periphery of the lower surface of the elastic sheet 21 for fitting with the annular groove 20. Projections 21 c corresponding to the movable contacts 21 a are formed integrally with and protrude from the elastic sheet 21, and the key tops 16 are securely adhered to the top surfaces of the projections 21 c.
Numeral 22 denotes a press plate for pressing the elastic sheet 21 to the recess bottom surface 18a when fitted with the recess 18 of the watch case 11. A decorative panel 1 5 is securely adhered to the top surface of the press plate 22.
Key top through holes 23 are formed in the press plate 22 and in the decorative panel 1 5 through which the key tops 16 extend. A projection 22a to be forcibly fit into a screw hole 21 d in the elastic sheet 21 is formed integrally with the lower surface of the press plate 22. A screw receiving hole 22b is formed from the lower surface of the projection 22a. A projection 21 e is formed integrally with the periphery of the upper surface of the screw hole 21 d of the elastic sheet 21 for better contact with the press plate 22.
The elastic sheet 21 is arranged at the recess bottom surface 1 8a of the watch case 11 in such a manner that the movable contacts 21 a at its lower surface extend through the holes 19 and the annular projection 21 b fits in the annular groove 20. The press plate 22 is superposed thereon in such a manner that its projection 22a fits in the screw hole 21 d of the elastic sheet 21.
The elastic sheet 21 is securely pressed to the recess bottom 1 8a by the press plate 22 by fastening screws 24 inside the watch case 11.
Numeral 25 denotes a watch module which is mounted inside the watch case 11 and whose bottom surface is held by a back lid 26. The watch module 25 is constructed by mounting a circuit board 28 to the lower surface of the top surface plate of a module frame body 27 and connecting a display panel and a quartz oscillator (not shown) to the circuit board 28. Stationary contacts 28a corresponding to the respective movable contacts 21a of the elastic sheet 21 are arranged on the top surface of the circuit board 28. Movable contact inserting holes 29 surrounding the stationary contacts 28a are formed in the upper surface plate of the module frame body 27.
Numeral 30 denotes a buttontype cell (e.g., a lithium cell) and 31 denotes a packing which seals the fitting part of the watch case 11 and the back lid 26.
In the electronic wristwatch of this embodiment, when the key tops 26 are depressed, the movable contacts 21 a are displaced downwardly by the elastic deformation of the elastic sheet 21 and contact the stationary contacts 28a of the watch module 25. Since the elastic sheet 21 is forcibly pressed by the press plate 22 to the bottom surface 18a of the recess 18 formed on the top surface of the watch case 11, the elastic sheet 21 may not be displaced of float from the watch case 11, and the watertightness of the switching part is ensured.
Further, with the electronic wristwatch of this embodiment, the elastic sheet 21 is disposed at the upper surface of the watch case 11 and is securely pressed to the watch case 11 not by the watch module 25, it is not necessary to mount the watch module 25 in such a manner that it is pressed toward the inner surface of the watch case 11. Consequently, the mounting of the watch module 25 may be made simpler, and the watertightness may not be lost by the watch module 25 being pressed down by the key tops 1 6. Furthermore, since the elastic sheet 21 is arranged at the upper surface side of the watch case 11 and is securely pressed by the press plate 22 screwed to the watch case 11, better watertightness may be obtained and the mounting of the elastic sheet 21 may be made simpler than an arrangement in which the elastic sheet 21 is disposed at the inner surface of the watch case 11.
Fig. 5 is a front view of an electronic wristwatch in accordance with another embodiment of the present invention wherein numeral 32 denotes a liquid crystal display body for displaying a time table or the result of a calculation. The display electrode of the liquid crystal display body 32 is capable of displaying a value of 6 digits. A key 33 is included to be switched for displaying numerals not displayed when the operation result is a value of over 6 digits.
Numeral 37 denotes a watch case of synthetic resin at the lower side of which is disposed a keyboard 37a. Key tops 38 for inputting numerals and functions are disposed at the keyboard 37a.
Fig. 6 is a sectional view along the line VI--VI of Fig. 5.
The liquid crystal display body 32 is electrically connected to a circuit board 34 through the interconnector 33. An integrated circuit 35 and a cell 36 are disposed at the lower surface of the circuit board 34. A recess 39 is formed in the keyboard 37a of the abovementioned case. A press plate 40 of synthetic resin fits securely in the recess 39, and a decorative laminated sheet 42 is superposed for adhesion to the upper surface of the press plate 40 through doublesided adhesion tape 41. A plurality of key holes 43 are formed in the press plate 40 and in the decorative sheet 42 at places corresponding to the positions of the respective key tops 38.
Numerals from 0 to 9 for displaying the functions of each key switch and the symbols"." and "+" are printed on the top surface of the decorative sheet 42. A rectangular elastic sheet 44 of insulating rubber is superposed on the bottom wall of the recess 39 of the watch case 37.
Projections 45 are formed integrally with and protrude from the top surface of the elastic sheet 44. The key tops 38 are secured to the upper surfaces of the respective projections 45. A projection 44a is formed at the periphery of the lower surface of the elastic sheet 44, and the projection 44a fits in a groove 39a of the recess 39 for watertightness. Columnar movable contacts 46 of electrically conductive rubber are secured to the lower surface of the elastic sheet 44. A plurality of insertion holes 47 are formed in the recess 39 of the watch case 37 at positions corresponding to the movable contacts 46 of the elastic sheet 44. Tapered parts 47a are formed at the ends (upper ends in the figure) of the insertion holes 47 in the elastic sheet side.The depth and the tapered inclination of these tapered parts 47a are so set that the parts of the elastic sheet 44 corresponding to the tapered parts 47a bend downwardly without any problem and sink, and the inner circumferences of the tapered parts regulate the sinking of the elastic sheet 44 to a predetermined depth. Two stationary contacts 48 are formed on the upper surface of the circuit board 34 at positions corresponding to the movable contacts 46. Numeral 49 denotes a notched groove formed in the watch case 37, in which is inserted a projection piece 51 of a housing 50 for preventing downward displacement of the watch module by the key operation.
The switching operation of the keyboard disposed in the electronic wristwatch will be described. When the switching operation is not performed, the elastic sheet 44 is in the flat condition due to its own elasticity and it presses the key tops 38 upward. Therefore, the movable contact 46 is separate from the stationary contact 48 as shown in Fig. 7. When a key top 38 is depressed, the elastic sheet 44 sinks downward.
With this sinking of the elastic sheet 44, the movable contact 46 drops to the stationary contact 48 on the circuit board 34. Fig. 8 shows the condition in which the movable contact 46 is in contact with the stationary contact 48. Under this condition, the elastic sheet 44 facing the tapered part 47a of the insertion hole 47 is inhibited in its lower movement by the tapered part 47a, thus facilitating the switching operation.
The elastic sheet 44 gradually starts bending downwardly from the opening edge of the tapered part 47a, so that a large pressing force is not required for starting the pressing operation of the key top 38. The elastic sheet 44 is gradually bent downwardly while guided by the inner surface of the tapered part 47a of the elastic sheet 44. Since the diameter of the inner surface of the tapered part 47a becomes smaller toward the bottom, the bending of the elastic sheet 44 is gradually regulated and stops at a fixed position.
Accordingly, the pressing force required for the switching operation may be made smooth throughout the operation so that the switching is smooth and damage to the elastic sheet 44 may be prevented due to abrupt deformation and irregular application of force. The movable contacts 46 contact the stationary contact 48 with suitable force and in a stable manner so that the double making and chattering may be prevented since excessive force is not exerted even when the key tops 37 and 38 are depressed.
Claims (8)
1. A key input device for an electronic timepiece calculator characterized by comprising a watch case with a plurality of coplanar through holes; switch terminals each arranged in correspondence with said respective through holes; a watertight elastic sheet having a flat plate arranged at the outer face of said watch case and covering said plurality of through holes, and movable contacts each inserted in said plurality of through holes.
2. A key input device for an electronic timepiece calculator as claimed in claim 1 characterized in that an annular projection is formed at the periphery of said flat plate of said watertight elastic sheet, and said annular projection is arranged to surround said plurality of through holes at the outer surface of said watch case for watertightness.
3. A key input device for an electronic time piece calculator as claimed in claim 2 characterized in that an annular notched groove is formed to surround said plurality of through holes, and said annular projection is forcibly fit in said annular notched groove for keeping said plurality of through holes watertight.
4. A key input device for an electronic timepiece calculator as claimed in claim 1 characterized in that tapered surfaces are formed at the outer surface side of said through holes for regulating the displacement of said movable contacts toward inside said watch case.
5. A key input device for an electronic timepiece calculator characterized by comprising a watch case with a recess formed on its outer surface; a plurality of through holes formed in the bottom surface of said recess of said watch case; a watertight elastic sheet having a flat plate disposed in said recess and covering said plurality of through holes and further having movable contacts each extending though said through holes; key top parts arranged on the top surface of said flat plate in correspondence with said movable contacts for displacing said movable contacts of said watertight elastic sheet into said watch case for a switching operation; and a press member which has through holes through which extend said key top parts and which presses said flat plate of said watertight elastic sheet against said bottom surface of said recess.
6. A key input device for an electronic timepiece calculator as claimed in claim 5 characterized in that the top surface of said press member is printed for displaying switching functions of said key tops.
7. A key input device for an electronic timepiece calculator as claimed in claim 5 characterized in that said key tops and said movable contacts are formed integrally with said flat plate.
8. A key input device for an electronic timepiece calculator, substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14247979U JPS5660126U (en) | 1979-10-15 | 1979-10-15 | |
| JP14248279U JPS5659686U (en) | 1979-10-15 | 1979-10-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2062304A true GB2062304A (en) | 1981-05-20 |
| GB2062304B GB2062304B (en) | 1983-07-13 |
Family
ID=26474468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8032375A Expired GB2062304B (en) | 1979-10-15 | 1980-10-08 | Key input device for electronic timepiece calculator |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH648181GA3 (en) |
| DE (1) | DE3038613C2 (en) |
| GB (1) | GB2062304B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2264393A (en) * | 1992-02-22 | 1993-08-25 | Mckechnie Uk Ltd | Keyboard |
| GB2266186A (en) * | 1992-04-14 | 1993-10-20 | Motorola Gmbh | A keyboard. |
| US5367133A (en) * | 1992-04-14 | 1994-11-22 | Motorola, Inc. | Keypad including membrane with replaceable key elements |
| GB2311897A (en) * | 1996-04-01 | 1997-10-08 | Motorola Inc | Keypad configuration |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2710181B2 (en) * | 1992-01-28 | 1998-02-10 | 日本電気株式会社 | Illuminated key top structure |
| JP2000151772A (en) * | 1998-11-12 | 2000-05-30 | Matsushita Electric Ind Co Ltd | Portable terminal |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3954085A (en) * | 1974-08-30 | 1976-05-04 | International Business Machines Corporation | Self-restoring changeable exhibitor/keyboard |
| JPS5193258A (en) * | 1975-02-14 | 1976-08-16 | ||
| JPS5348638A (en) * | 1976-10-15 | 1978-05-02 | Sharp Corp | Electronic apparatus |
| US4119839A (en) * | 1976-11-30 | 1978-10-10 | W & G Instruments, Inc. | Keyboard mask for general-purpose calculator |
-
1980
- 1980-10-08 GB GB8032375A patent/GB2062304B/en not_active Expired
- 1980-10-13 DE DE3038613A patent/DE3038613C2/en not_active Expired
- 1980-10-15 CH CH771880A patent/CH648181GA3/de unknown
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2264393A (en) * | 1992-02-22 | 1993-08-25 | Mckechnie Uk Ltd | Keyboard |
| GB2266186A (en) * | 1992-04-14 | 1993-10-20 | Motorola Gmbh | A keyboard. |
| US5367133A (en) * | 1992-04-14 | 1994-11-22 | Motorola, Inc. | Keypad including membrane with replaceable key elements |
| GB2266186B (en) * | 1992-04-14 | 1995-09-20 | Motorola Gmbh | A keyboard |
| GB2311897A (en) * | 1996-04-01 | 1997-10-08 | Motorola Inc | Keypad configuration |
| US5729221A (en) * | 1996-04-01 | 1998-03-17 | Motorola, Inc. | Keypad configuration |
| GB2311897B (en) * | 1996-04-01 | 2000-08-16 | Motorola Inc | Keypad configuration |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2062304B (en) | 1983-07-13 |
| DE3038613A1 (en) | 1981-04-30 |
| CH648181GA3 (en) | 1985-03-15 |
| DE3038613C2 (en) | 1983-12-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19991008 |