GB1402221A – Electronic watch having quartz crystal controlled oscillator and frequency divider arrangement for driving a display device
– Google Patents
GB1402221A – Electronic watch having quartz crystal controlled oscillator and frequency divider arrangement for driving a display device
– Google Patents
Electronic watch having quartz crystal controlled oscillator and frequency divider arrangement for driving a display device
Info
Publication number
GB1402221A
GB1402221A
GB2812673A
GB2812673A
GB1402221A
GB 1402221 A
GB1402221 A
GB 1402221A
GB 2812673 A
GB2812673 A
GB 2812673A
GB 2812673 A
GB2812673 A
GB 2812673A
GB 1402221 A
GB1402221 A
GB 1402221A
Authority
GB
United Kingdom
Prior art keywords
chip
driving
frequency divider
frequency
quartz crystal
Prior art date
1972-07-03
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
Application number
GB2812673A
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.)
Raytheon Co
Original Assignee
Hughes Aircraft Co
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.)
1972-07-03
Filing date
1973-06-13
Publication date
1975-08-06
1973-06-13
Application filed by Hughes Aircraft Co
filed
Critical
Hughes Aircraft Co
1975-08-06
Publication of GB1402221A
publication
Critical
patent/GB1402221A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
239000013078
crystal
Substances
0.000
title
abstract
5
239000010453
quartz
Substances
0.000
title
abstract
3
VYPSYNLAJGMNEJ-UHFFFAOYSA-N
silicon dioxide
Inorganic materials
O=[Si]=O
VYPSYNLAJGMNEJ-UHFFFAOYSA-N
0.000
title
abstract
3
239000004973
liquid crystal related substance
Substances
0.000
abstract
2
229910052594
sapphire
Inorganic materials
0.000
abstract
1
239000010980
sapphire
Substances
0.000
abstract
1
239000004065
semiconductor
Substances
0.000
abstract
1
229910052710
silicon
Inorganic materials
0.000
abstract
1
239000010703
silicon
Substances
0.000
abstract
1
Classifications
G—PHYSICS
G04—HOROLOGY
G04G—ELECTRONIC TIME-PIECES
G04G3/00—Producing timing pulses
G04G3/02—Circuits for deriving low frequency timing pulses from pulses of higher frequency
G—PHYSICS
G04—HOROLOGY
G04F—TIME-INTERVAL MEASURING
G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
G04F5/04—Apparatus for producing preselected time intervals for use as timing standards using oscillators with electromechanical resonators producing electric oscillations or timing pulses
G04F5/06—Apparatus for producing preselected time intervals for use as timing standards using oscillators with electromechanical resonators producing electric oscillations or timing pulses using piezoelectric resonators
G04F5/063—Constructional details
G—PHYSICS
G04—HOROLOGY
G04G—ELECTRONIC TIME-PIECES
G04G17/00—Structural details; Housings
G04G17/02—Component assemblies
G04G17/04—Mounting of electronic components
Abstract
1402221 Electronic timepieces HUGHES AIRCRAFT CO 13 June 1973 [3 July 1972] 28126/73 Heading G3R [Also in Division H3] In an electronic timepiece (e.g. a ladies watch) comprising a quartz crystal controlled oscillator circuit (providing a time base frequency of at least 1 MHz) and frequency dividing arrangement for driving a time display device (e.g. liquid crystal, light-emitting diodes or an electric motor driving hands), the quartz crystal 13 Fig. 3 is coupled to a first integrated circuit chip 15 including the oscillator circuit and a first frequency divider for dividing down e.g. to about 100 KHz. A second integrated circuit chip 17 is connected to the first and includes a second frequency divider for producing low frequency signals e.g. 1 pulse/hour for driving the display; the second IC chip having an inherently lower leakage current and inherently higher nodal capacitance than the first IC chip. The first IC chip 15, has relatively low nodal capacitance, achieved by the use of a semiconductor layer (silicon) deposited on an insulating layer (sapphire) whereby it can operate at extremely high frequencies without excessive power consumption. The chip 17 also includes electronic circuitry (not described) which produces from the second divider output, signals suitable for driving a digital display as shown Fig. 8. Therein hours, minutes, day and date are displayed, also the first digit of the seconds and ten dots which are illuminated successively to indicate passing seconds. When for instance the 59th second arrives, the first digit «5» and nine dots are illuminated. Battery voltage is converted to a higher voltage to operate a liquid crystal display. Alternatively, the output of the second frequency divider may be used to drive a motor coupled to hands Fig. 11 (not shown). For frequencies in the order of 1MHz, a D.T. cut crystal is used mounted as illustrated in Figs. 4, 5 (not shown). For frequencies about 9 MHz and A.T. cut crystal is used supported at each end, as illustrated Figs. 6, 7 (not shown). Known types of oscillator and frequency divider circuitry employing C/MOS elements may be used. Suitable circuits are illustrated in Figs. 15, 16 (not shown).
GB2812673A
1972-07-03
1973-06-13
Electronic watch having quartz crystal controlled oscillator and frequency divider arrangement for driving a display device
Expired
GB1402221A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US26829172A
1972-07-03
1972-07-03
Publications (1)
Publication Number
Publication Date
GB1402221A
true
GB1402221A
(en)
1975-08-06
Family
ID=23022301
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB2812673A
Expired
GB1402221A
(en)
1972-07-03
1973-06-13
Electronic watch having quartz crystal controlled oscillator and frequency divider arrangement for driving a display device
Country Status (4)
Country
Link
US
(1)
US3757510A
(en)
JP
(1)
JPS4953873A
(en)
GB
(1)
GB1402221A
(en)
HK
(1)
HK62576A
(en)
Families Citing this family (25)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3934399A
(en)
*
1972-06-12
1976-01-27
Kabushiki Kaisha Seikosha
Electric timepiece incorporating rectifier and driving circuits integrated in a single chip
US3959964A
(en)
*
1972-08-03
1976-06-01
Kabushiki Kaisha Suwa Seikosha
Mounting arrangement for timepiece components
JPS4941055A
(en)
*
1972-08-28
1974-04-17
US4015419A
(en)
*
1972-10-02
1977-04-05
Citizen Watch Co., Ltd.
Electronic timepiece
JPS4963371A
(en)
*
1972-10-19
1974-06-19
JPS4991279A
(en)
*
1972-12-29
1974-08-31
DE2323858C3
(en)
*
1973-05-11
1975-12-18
Deutsche Itt Industries Gmbh, 7800 Freiburg
Monolithically integrable crystal oscillator circuit
JPS506369A
(en)
*
1973-05-16
1975-01-23
US3889459A
(en)
*
1973-06-01
1975-06-17
Sun Lu
Electronic timepiece and method of making the same
JPS5062575U
(en)
*
1973-10-06
1975-06-07
JPS5751076B2
(en)
*
1973-08-02
1982-10-30
JPS5049470U
(en)
*
1973-08-31
1975-05-15
GB1479779A
(en)
*
1973-09-25
1977-07-13
Citizen Watch Co Ltd
Liquid crystal display wrist watch
US3956880A
(en)
*
1973-10-18
1976-05-18
Time Computer, Inc.
Solid state wristwatch with charge coupled divider
DE2403289C3
(en)
*
1974-01-24
1984-05-17
Gebr. Staiger, Fabrik für Feinmechanik und Elektrotechnik-Kunststoffspritzerei, 7742 St. Georgen
Battery operated alarm clock
US3887881A
(en)
*
1974-01-24
1975-06-03
American Micro Syst
Low voltage CMOS amplifier
US3863436A
(en)
*
1974-04-18
1975-02-04
Timex Corp
Solid state quartz watch
JPS50147883A
(en)
*
1974-05-20
1975-11-27
US3945196A
(en)
*
1974-05-30
1976-03-23
American Microsystems, Inc.
Universal solid state time-keeping package
US4060971A
(en)
*
1974-09-10
1977-12-06
Time Computer, Inc.
Solid state watch with inertial switch
US4045953A
(en)
*
1974-09-30
1977-09-06
Kabushiki Kaisha Daini Seikosha
Circuit board for an electronic timepiece
JPS593897B2
(en)
*
1975-07-25
1984-01-26
シチズン時計株式会社
Bunshiyu Cairo
CH608327B
(en)
*
1976-01-19
Ebauches Sa
ELECTRONIC WATCH.
US4104860A
(en)
*
1976-12-27
1978-08-08
Solid State Scientific Inc.
High speed dynamic flip-flop system
EP1852756B1
(en)
*
2005-02-24
2010-09-01
Seiko Epson Corporation
Clock signal outputting device and its control method
Family Cites Families (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
CH205066A4
(en)
*
1966-02-10
1969-08-15
GB1205753A
(en)
*
1966-09-09
1970-09-16
Smiths Industries Ltd
Horological instruments incorporating electrical oscillation generators
US3505804A
(en)
*
1968-04-23
1970-04-14
Rca Corp
Solid state clock
US3576099A
(en)
*
1969-04-22
1971-04-27
Hamilton Watch Co
Solid state timepiece having electro-optical time display
US3672155A
(en)
*
1970-05-06
1972-06-27
Hamilton Watch Co
Solid state watch
US3668861A
(en)
*
1970-11-17
1972-06-13
Suwa Seikosha Kk
Solid state electronic watch
1972
1972-07-03
US
US00268291A
patent/US3757510A/en
not_active
Expired – Lifetime
1973
1973-06-13
GB
GB2812673A
patent/GB1402221A/en
not_active
Expired
1973-07-03
JP
JP48074490A
patent/JPS4953873A/ja
active
Pending
1976
1976-10-07
HK
HK625/76*UA
patent/HK62576A/en
unknown
Also Published As
Publication number
Publication date
HK62576A
(en)
1976-10-15
US3757510A
(en)
1973-09-11
JPS4953873A
(en)
1974-05-25
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(en)
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Legal Events
Date
Code
Title
Description
1975-12-17
PS
Patent sealed [section 19, patents act 1949]
1979-01-24
PCNP
Patent ceased through non-payment of renewal fee
