CA1069320A - Electronic watch with cover plate integrally molded to a circuit base plate - Google Patents
Electronic watch with cover plate integrally molded to a circuit base plateInfo
- Publication number
- CA1069320A CA1069320A CA262,287A CA262287A CA1069320A CA 1069320 A CA1069320 A CA 1069320A CA 262287 A CA262287 A CA 262287A CA 1069320 A CA1069320 A CA 1069320A
- Authority
- CA
- Canada
- Prior art keywords
- base plate
- cover
- circuit base
- electronic watch
- circuit
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G17/00—Structural details; Housings
- G04G17/02—Component assemblies
- G04G17/04—Mounting of electronic components
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G17/00—Structural details; Housings
- G04G17/02—Component assemblies
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electric Clocks (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention provides an electronic watch having a circuit base plate covered by a cover integrally molded to the base plate by a transfer molding process. The cover provides a connector opening for connection to a liquid crystal display, as well as protection for an integrated circuit mounted on the base plate. At the same time, openings are left in the cover-ing through which solder connections to large electrical com-ponents such as quartz crystals and condensers may be made.
Excellent insulation, water-proofing and heat resistance are obtained.
The invention provides an electronic watch having a circuit base plate covered by a cover integrally molded to the base plate by a transfer molding process. The cover provides a connector opening for connection to a liquid crystal display, as well as protection for an integrated circuit mounted on the base plate. At the same time, openings are left in the cover-ing through which solder connections to large electrical com-ponents such as quartz crystals and condensers may be made.
Excellent insulation, water-proofing and heat resistance are obtained.
Description
lOf~9~ 0 B~CKGROUND OF T~IE INVENTION
This invention relates to an electronic watch having a circuit base plate covered by a cover integrally molded by a transfer molding process to the base plate.
In the conventional type of electronic watch, the base plate is covered by a separate cover separately molded. Therefore, a process of making an electronic watch was complicated, by having to assemble the base plate, cover plate, display device, connector and large components.
The present invention aims to simplify this assembly and improve reliability. Accordingly the present invention provides an electronic watch having a circuit base plate covered by a cover plate integrally molded by a transfer molding process to the base plate.
The present invention provides an electronic watch having parts easily mounted to the circuit base plate with the number of parts reduced.
SUMMARY OF THE INVENTION
According to the present invention, there is provided an electronic watch having a circuit base plate and a cover plate inte-grally molded to the base plate by a transfer molding process.
More particularly, the electronic watch comprises, in com-bination, a circuit base plate having circuit parts mounted thereon, an integrated circuit portion formed in the circuit base plate, a covering formed by a transfer molding in order to cover the circuit base plate, and a display device, wherein the covering is constructed so as to have shape and structure suitable for the mounting of cir-,~
,: - . . : j - .. :
33'~() cuit parts, and a display device on the circuit base plate.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings show one preferred embodiment of the present invention, wherein:
Figure 1 is a cross sectional view of a particular portion of an electronic watch of the invention;
Figure 2 is a plan view of another form of circuit base plate and cover; and Figure 3 shows a perspective view of a connector.
A circuit base plate 1 has a recess la in which IC (inte-grated circuit) 2 is mounted, holes lb, and lc for fitting a crystal oscillator 3 therein, an electrode pattern ld for connecting to elec-tric elements, and an electrode pattern le for connecting the output of the IC 2 to a liquid crystal panel 4. The liquid crystal panel 4 is fixed to the circuit base plate 1 so as to connect with it. A
cover 5 made of synthetic resin molded by a transfer molding process, covers the circuit base plate 1. On the cover 5, a through-hole 5c for positioning a connector 6 is formed 50 as to connect the elec-trode pattern le to the electrode pattern 4e of the display 4. Arecess 5b is provided to receive the liquid crystal panel 4. The connector 6 of silicone rubber, has alternate conductive layers 6a and insulating layers 6b. The spacing of conductive layers 6a is arranged to be shorter than the spacing of the electrode pattern le of the circuit base plate 1 (see Figures 2 and 3). T~us, if the ': :
, , . ... . :
~-., : .
.
, : , :
3'~:0 connector 6 shifts in relation to the electrode pattern le the elec-trical connection between the patterns le and 4a is not affected.
4a is a transparent electrode formed on the liquid crystal panel 4 and 9 is a panel presser.
The inner face of the integrated circuit IC 2 is secured to a recess of the circuit base plate 1 by bond paste and the like.
Output of the IC 2 is connected to an electrode pattern of the base plate 1 through a wire bonding process which is embedded in the cover 5 by synthetic resin sealed by a transfer molding process. A lead terminal 3a of the crystal oscillator 3 and a ground 3b are inserted into holes lb and lc of the base plate 1 and secured by soldering.
A condenser 8 for stabilizing oscillation and a trimmer condenser are fixed to an electrode pattern ld of the circuit base plate 1 by sold-ering. The liquid crystal panel 4 is kept in place on a side of the recessed portion b of the covering 5 by means of a panel presser 9.
A connector 6 is inserted through a through-hole 5c of the covering 5 and fixed in place between the electrode pattern le of the circuit base plate 1 and a transparent electrode 4a of the liquid crystal in order to electrically connect the electrode pattern le and the trans-parent electrode 4a. The connector 6, is guided into the through-hole 5c and easily secured at its predetermined position. In this manner, the through-hole 5c functions to firmly position the connec-tor 6. Since the through-hole 5c is formed in the cover 5 made of synthetic resin, the covering itself attains its useful function as a kind of connector frame and so that the connector, when fitted, is sufficiently protected. In order to form the cover 5 by transfer molding, upper and lower faces of the circuit base plate 1 are held ' ' ' , ,: , , ':
~ i93ZO
in a mold and form a pattern for soldering of circuit elements with-out obstruction due to burring of the synthetic resin material.
Epoxy synthetic resin having few impurities, good water-proofing and excellent heat-resistance is suitable for molding the cover 5. Pre-ferably, a suitable material is that sold under the Trade Mark as Polyset 410 having a coefficient of linear expansion value which is almost the same as that of the circuit base plate 1.
As explained above, according to the present invention, the covering portion made by means of transfer process has a through-hole for installing the connector therein, so that the correct position of the connector is firmly determined by using the connector and the installing of the connector can be carried out easily and firmly.
Because the through-hole is formed in the covering made of synthetic resin, the covering itself has a function of a kind of connector frame and the connector installed is completely protected from da-mage. Therefore, according to the present invention, there is no need to form another connector frame, resulting in reduction of parts number, simplification of the construction of the electronic watch, 19 and decreasing of the manufacturing cost.
, ~ . -:
,
This invention relates to an electronic watch having a circuit base plate covered by a cover integrally molded by a transfer molding process to the base plate.
In the conventional type of electronic watch, the base plate is covered by a separate cover separately molded. Therefore, a process of making an electronic watch was complicated, by having to assemble the base plate, cover plate, display device, connector and large components.
The present invention aims to simplify this assembly and improve reliability. Accordingly the present invention provides an electronic watch having a circuit base plate covered by a cover plate integrally molded by a transfer molding process to the base plate.
The present invention provides an electronic watch having parts easily mounted to the circuit base plate with the number of parts reduced.
SUMMARY OF THE INVENTION
According to the present invention, there is provided an electronic watch having a circuit base plate and a cover plate inte-grally molded to the base plate by a transfer molding process.
More particularly, the electronic watch comprises, in com-bination, a circuit base plate having circuit parts mounted thereon, an integrated circuit portion formed in the circuit base plate, a covering formed by a transfer molding in order to cover the circuit base plate, and a display device, wherein the covering is constructed so as to have shape and structure suitable for the mounting of cir-,~
,: - . . : j - .. :
33'~() cuit parts, and a display device on the circuit base plate.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings show one preferred embodiment of the present invention, wherein:
Figure 1 is a cross sectional view of a particular portion of an electronic watch of the invention;
Figure 2 is a plan view of another form of circuit base plate and cover; and Figure 3 shows a perspective view of a connector.
A circuit base plate 1 has a recess la in which IC (inte-grated circuit) 2 is mounted, holes lb, and lc for fitting a crystal oscillator 3 therein, an electrode pattern ld for connecting to elec-tric elements, and an electrode pattern le for connecting the output of the IC 2 to a liquid crystal panel 4. The liquid crystal panel 4 is fixed to the circuit base plate 1 so as to connect with it. A
cover 5 made of synthetic resin molded by a transfer molding process, covers the circuit base plate 1. On the cover 5, a through-hole 5c for positioning a connector 6 is formed 50 as to connect the elec-trode pattern le to the electrode pattern 4e of the display 4. Arecess 5b is provided to receive the liquid crystal panel 4. The connector 6 of silicone rubber, has alternate conductive layers 6a and insulating layers 6b. The spacing of conductive layers 6a is arranged to be shorter than the spacing of the electrode pattern le of the circuit base plate 1 (see Figures 2 and 3). T~us, if the ': :
, , . ... . :
~-., : .
.
, : , :
3'~:0 connector 6 shifts in relation to the electrode pattern le the elec-trical connection between the patterns le and 4a is not affected.
4a is a transparent electrode formed on the liquid crystal panel 4 and 9 is a panel presser.
The inner face of the integrated circuit IC 2 is secured to a recess of the circuit base plate 1 by bond paste and the like.
Output of the IC 2 is connected to an electrode pattern of the base plate 1 through a wire bonding process which is embedded in the cover 5 by synthetic resin sealed by a transfer molding process. A lead terminal 3a of the crystal oscillator 3 and a ground 3b are inserted into holes lb and lc of the base plate 1 and secured by soldering.
A condenser 8 for stabilizing oscillation and a trimmer condenser are fixed to an electrode pattern ld of the circuit base plate 1 by sold-ering. The liquid crystal panel 4 is kept in place on a side of the recessed portion b of the covering 5 by means of a panel presser 9.
A connector 6 is inserted through a through-hole 5c of the covering 5 and fixed in place between the electrode pattern le of the circuit base plate 1 and a transparent electrode 4a of the liquid crystal in order to electrically connect the electrode pattern le and the trans-parent electrode 4a. The connector 6, is guided into the through-hole 5c and easily secured at its predetermined position. In this manner, the through-hole 5c functions to firmly position the connec-tor 6. Since the through-hole 5c is formed in the cover 5 made of synthetic resin, the covering itself attains its useful function as a kind of connector frame and so that the connector, when fitted, is sufficiently protected. In order to form the cover 5 by transfer molding, upper and lower faces of the circuit base plate 1 are held ' ' ' , ,: , , ':
~ i93ZO
in a mold and form a pattern for soldering of circuit elements with-out obstruction due to burring of the synthetic resin material.
Epoxy synthetic resin having few impurities, good water-proofing and excellent heat-resistance is suitable for molding the cover 5. Pre-ferably, a suitable material is that sold under the Trade Mark as Polyset 410 having a coefficient of linear expansion value which is almost the same as that of the circuit base plate 1.
As explained above, according to the present invention, the covering portion made by means of transfer process has a through-hole for installing the connector therein, so that the correct position of the connector is firmly determined by using the connector and the installing of the connector can be carried out easily and firmly.
Because the through-hole is formed in the covering made of synthetic resin, the covering itself has a function of a kind of connector frame and the connector installed is completely protected from da-mage. Therefore, according to the present invention, there is no need to form another connector frame, resulting in reduction of parts number, simplification of the construction of the electronic watch, 19 and decreasing of the manufacturing cost.
, ~ . -:
,
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An electronic watch comprising in combination: a cir-cuit base plate having circuit parts mounted thereon including an integrated circuit positioned in a recess in said circuit base plate, a cover formed by a transfer molding on said base plate in order to cover said circuit base plate, and provided with a plurality of openings and a display device, said cover openings being arranged to permit the soldering of selected components to said circuit base plate, to provide a means for mounting said display device to said cover, and for positioning connecting means between the circuit base plate and the display device.
2. An electronic watch as claimed in claim 1, wherein said display is a liquid crystal device, and said connecting means is a silicone rubber strip formed of alternating layers of conducting and non-conducting silicone rubber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50118507A JPS5242766A (en) | 1975-09-30 | 1975-09-30 | Electronic watch |
| JP50118508A JPS5242767A (en) | 1975-09-30 | 1975-09-30 | Electronic watch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1069320A true CA1069320A (en) | 1980-01-08 |
Family
ID=26456431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA262,287A Expired CA1069320A (en) | 1975-09-30 | 1976-09-29 | Electronic watch with cover plate integrally molded to a circuit base plate |
Country Status (7)
| Country | Link |
|---|---|
| BR (1) | BR7606507A (en) |
| CA (1) | CA1069320A (en) |
| DE (1) | DE2643972A1 (en) |
| FR (1) | FR2326731A1 (en) |
| GB (1) | GB1510906A (en) |
| HK (1) | HK85079A (en) |
| IT (1) | IT1080510B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4348751A (en) * | 1977-06-20 | 1982-09-07 | Hitachi, Ltd. | Electronic device and method of fabricating the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3784725A (en) * | 1972-07-24 | 1974-01-08 | Solitron Devices | Electronic hybrid package |
-
1976
- 1976-09-28 FR FR7629102A patent/FR2326731A1/en not_active Withdrawn
- 1976-09-28 GB GB4021376A patent/GB1510906A/en not_active Expired
- 1976-09-29 CA CA262,287A patent/CA1069320A/en not_active Expired
- 1976-09-29 IT IT5149876A patent/IT1080510B/en active
- 1976-09-29 BR BR7606507A patent/BR7606507A/en unknown
- 1976-09-29 DE DE19762643972 patent/DE2643972A1/en not_active Withdrawn
-
1979
- 1979-12-13 HK HK85079A patent/HK85079A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE2643972A1 (en) | 1977-04-07 |
| HK85079A (en) | 1979-12-21 |
| IT1080510B (en) | 1985-05-16 |
| BR7606507A (en) | 1977-06-28 |
| FR2326731A1 (en) | 1977-04-29 |
| GB1510906A (en) | 1978-05-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |