Patent US5028945A successfully refreshed from Google Patents.
US5028945A
Expired / Lapsed
US
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Electric zoom camera
Assignee: Panasonic Photo and Lighting Co Ltd
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Filing: 1990-09-18
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Granted: 1991-07-02
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Expires: 2010-09-18
Abstract
Abstract Electric zoom camera wherein zooming speed is not influenced even by drop of power source voltage, by driving its zooming electric motor by an electric pulse current such that the period (T 0 , T 1 , T 2 , - - -) is defined by present period of a lens position signal "b" from a lens position detector (2) which consists of a photo-interrupter and a photo-coupler, and each of the period length is divided into a first portion (Po) (off-portion) wherein motor current is off and a second portion (Pd) (duty portion) wherein the motor current is on, the length of the first portion (Po) being adjusted responding to the present zooming speed obtained from the lens position signal outputted from the lens position detector (2).
Inventors
- 👤 Toshitsugu Kashihara
- 👤 Hirohiko Ina
- 👤 Toshihiko Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:54
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B7/10; G02B7/102
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
192 words
An electric zoom camera comprising: a zoom lens having a zoom-moving part, an electric motor linked to drive said zooming part, lens position detection means which generates lens position signal which is a pulse signal, responding to motion of said zooming part, speed detection means which generates a speed signal by receiving said lens position signal, comparison means for comparing data of said speed signal with a predetermined data, drive signal generating means which receive said lens position signal and generates a drive signal wherein period length is controlled to be equal to the period at present of said lens position signal, and each of said period length consists of a first portion for non-energy-feeding to said electric motor and a second portion for energy-feeding to said electric motor, said first portion being selected at a variable length and said second portion being the remainder of said period length, a motor driving circuit for producing a motor driving current wherein current is on during the second portion and off during the first portion, and control means which receives resultant data of said comparator and changes said variable length of said first portion.
Claim 2
Dependent Claim
192 words
An electric zoom camera comprising: a zoom lens having a zoom-moving part, an electric motor linked to drive said zooming part, lens position detection means which generates lens position signal which is a pulse signal, responding to motion of said zooming part, speed detection means which generates a speed signal by receiving said lens position signal, comparison means for comparing data of said speed signal with a predetermined data, drive signal generating means which receive said lens position signal and generates a drive signal wherein period length is controlled to be equal to the period at present of said lens position signal, and each of said period length consists of a first portion for non-energy-feeding to said electric motor and a second portion for energy-feeding to said electric motor, said first portion being selected at a variable length and said second portion being the remainder of said period length, a motor driving circuit for producing a motor driving current wherein current is on during the second portion and off during the first portion, and control means which receives resultant data of said comparator and changes said variable length of said first portion.
Claim 3
Dependent Claim
44 words
An electric zoom camera in accordance with claim 1, wherein said first portion is eliminated thereby making said period all of said second portion, and thereby feeding only on-current continuously to said motor for first several period from start of said lens position signal.
Claim 4
Dependent Claim
25 words
An electric zoom camera in accordance with claim 1 or 2 wherein said first portion is an off-portion and said second portion is an on-portion.
Claim 5
Dependent Claim
192 words
An electric zoom camera comprising: a zoom lens having a zoom-moving part, an electric motor linked to drive said zooming part, lens position detection means which generates lens position signal which is a pulse signal, responding to motion of said zooming part, speed detection means which generates a speed signal by receiving said lens position signal, comparison means for comparing data of said speed signal with a predetermined data, drive signal generating means which receive said lens position signal and generates a drive signal wherein period length is controlled to be equal to the period at present of said lens position signal, and each of said period length consists of a first portion for reduced-energy-feeding to said electric motor and a second portion for energy-feeding to said electric motor, said first portion being selected at a variable length and said second portion being the remainder of said period length, a motor driving circuit for producing a motor driving current wherein current is on during the second portion and off during the first portion, and control means which receives resultant data of said comparator and changes said variable length of said first portion.
Claim 6
Dependent Claim
192 words
An electric zoom camera comprising: a zoom lens having a zoom-moving part, an electric motor linked to drive said zooming part, lens position detection means which generates lens position signal which is a pulse signal, responding to motion of said zooming part, speed detection means which generates a speed signal by receiving said lens position signal, comparison means for comparing data of said speed signal with a predetermined data, drive signal generating means which receive said lens position signal and generates a drive signal wherein period length is controlled to be equal to the period at present of said lens position signal, and each of said period length consists of a first portion for reduced-energy-feeding to said electric motor and a second portion for energy-feeding to said electric motor, said first portion being selected at a variable length and said second portion being the remainder of said period length, a motor driving circuit for producing a motor driving current wherein current is on during the second portion and off during the first portion, and control means which receives resultant data of said comparator and changes said variable length of said first portion.
Claim 7
Dependent Claim
44 words
An electric zoom camera in accordance with claim 4, wherein said first portion is eliminated thereby making said period all of said second portion, and thereby feeding only on-current continuously to said motor for first several period from start of said lens position signal.
Claim 8
Dependent Claim
25 words
An electric zoom camera in accordance with claim 4 or 5 wherein said first portion is an off-portion and said second portion is an on-portion.
Claim 9
Dependent Claim
28 words
An electric zoom camera in accordance with claim 4 or 5 wherein said first portion is a high frequency pulse portion and said second portion is an on-portion.
Claim 10
Dependent Claim
192 words
An electric zoom camera comprising: a zoom lens having a zoom-moving part, an electric motor linked to drive said zooming part, lens position detection means which generates lens position signal which is a pulse signal, responding to motion of said zooming part, speed detection means which generates a speed signal by receiving said lens position signal, comparison means for comparing data of said speed signal with a predetermined data, drive signal generating means which receive said lens position signal and generates a drive signal wherein period length is controlled to be equal to the period at present of said lens position signal, and each of said period length consists of a first portion for controlled-energy-feeding to said electric motor and a second portion for energy-feeding to said electric motor, said first portion being selected at a variable length and said second portion being the remainder of said period length, a motor driving circuit for producing a motor driving current wherein current is on during the second portion and off during the first portion, and control means which receives resultant data of said comparator and changes said variable length of said first portion.
Claim 11
Dependent Claim
192 words
An electric zoom camera comprising: a zoom lens having a zoom-moving part, an electric motor linked to drive said zooming part, lens position detection means which generates lens position signal which is a pulse signal, responding to motion of said zooming part, speed detection means which generates a speed signal by receiving said lens position signal, comparison means for comparing data of said speed signal with a predetermined data, drive signal generating means which receive said lens position signal and generates a drive signal wherein period length is controlled to be equal to the period at present of said lens position signal, and each of said period length consists of a first portion for controlled-energy-feeding to said electric motor and a second portion for energy-feeding to said electric motor, said first portion being selected at a variable length and said second portion being the remainder of said period length, a motor driving circuit for producing a motor driving current wherein current is on during the second portion and off during the first portion, and control means which receives resultant data of said comparator and changes said variable length of said first portion.
References Cited (Backward Citations)
US4972215A
Cited
USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1994-07-01 | 1994-12-31 | 1995-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-01 | 1998-12-31 | 1999-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-01 | 2002-12-31 | 2003-07-02 | $7700.00 | Window Closed / Lapsed |