JPS5662220A - Unstable operation preventing system of automatic focus detector - Google Patents

Unstable operation preventing system of automatic focus detector

Info

Publication number
JPS5662220A
JPS5662220A JP13954979A JP13954979A JPS5662220A JP S5662220 A JPS5662220 A JP S5662220A JP 13954979 A JP13954979 A JP 13954979A JP 13954979 A JP13954979 A JP 13954979A JP S5662220 A JPS5662220 A JP S5662220A
Authority
JP
Japan
Prior art keywords
taking lens
capacitors
transistors
focus
driving
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
Application number
JP13954979A
Other languages
Japanese (ja)
Other versions
JPS6227688B2 (en
Inventor
Tokuichi Tsunekawa
Takashi Amikura
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP13954979A priority Critical patent/JPS5662220A/en
Priority to US06/199,262 priority patent/US4335942A/en
Priority to DE3040162A priority patent/DE3040162C2/en
Publication of JPS5662220A publication Critical patent/JPS5662220A/en
Publication of JPS6227688B2 publication Critical patent/JPS6227688B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE: To eliminate the unstability of a device owing to transient fluctuations by providing a delay circuit consisting of capacitors and transistors for electric discharging to the input of the driving circuit of a taking lens, disabling the lens driving circuit for a fixed time and instantaneously discharging the charge of the capacitors.
CONSTITUTION: In the taking lens driving control circuit, transistors TR1WTR4 control the forward and backward revolutions of a taking lens drive motor MT. TR5 and TR6 are transistors for controlling the TR1 and TR2, and the driving of the TR5, TR6 is delayed by way of capacitors C1, C2. On the other hand, the charge of the C1, C2 is instantaneously discharged by way of TR7, TR8, whereby the turning-off of the TR5, TR6 is made early to prevent the taking lens from fluctuating. The motor MT is revolved in a forward or backward direction by the combinations of the H level and L level of the focus detecting information MV1W MV4 from a focus control circuit, whereby the focusing is controlled. Thereby, the unstability owing the transient fluctuations of the focus detector is removed and the device is stably operated.
COPYRIGHT: (C)1981,JPO&Japio
JP13954979A 1979-10-26 1979-10-26 Unstable operation preventing system of automatic focus detector Granted JPS5662220A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP13954979A JPS5662220A (en) 1979-10-26 1979-10-26 Unstable operation preventing system of automatic focus detector
US06/199,262 US4335942A (en) 1979-10-26 1980-10-21 Camera provided with automatic focus detector
DE3040162A DE3040162C2 (en) 1979-10-26 1980-10-24 Automatic focusing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13954979A JPS5662220A (en) 1979-10-26 1979-10-26 Unstable operation preventing system of automatic focus detector

Publications (2)

Publication Number Publication Date
JPS5662220A true JPS5662220A (en) 1981-05-28
JPS6227688B2 JPS6227688B2 (en) 1987-06-16

Family

ID=15247841

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13954979A Granted JPS5662220A (en) 1979-10-26 1979-10-26 Unstable operation preventing system of automatic focus detector

Country Status (1)

Country Link
JP (1) JPS5662220A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57130324U (en) * 1981-02-03 1982-08-13
JPS5852607A (en) * 1981-09-24 1983-03-28 Nippon Kogaku Kk <Nikon> Automatic focusing device
JPS593406A (en) * 1982-06-29 1984-01-10 Olympus Optical Co Ltd Detector for focusing state
JPS6231814A (en) * 1985-08-02 1987-02-10 Matsushita Electric Ind Co Ltd Automatic focus adjusting device
JPH03155530A (en) * 1990-10-09 1991-07-03 Asahi Optical Co Ltd Lens shutter type zoom lens camera

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01223986A (en) * 1988-03-02 1989-09-07 Sankyo Kk Rotary drum device of slot machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52126225A (en) * 1976-04-15 1977-10-22 Asahi Optical Co Ltd Automatic focusing unit control circuit for ignoring pseudoofocus position detection signal

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52126225A (en) * 1976-04-15 1977-10-22 Asahi Optical Co Ltd Automatic focusing unit control circuit for ignoring pseudoofocus position detection signal

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57130324U (en) * 1981-02-03 1982-08-13
JPH0228508Y2 (en) * 1981-02-03 1990-07-31
JPS5852607A (en) * 1981-09-24 1983-03-28 Nippon Kogaku Kk <Nikon> Automatic focusing device
JPH0235962B2 (en) * 1981-09-24 1990-08-14 Nippon Kogaku Kk
JPS593406A (en) * 1982-06-29 1984-01-10 Olympus Optical Co Ltd Detector for focusing state
JPH0254523B2 (en) * 1982-06-29 1990-11-21 Olympus Optical Co
JPS6231814A (en) * 1985-08-02 1987-02-10 Matsushita Electric Ind Co Ltd Automatic focus adjusting device
JPH03155530A (en) * 1990-10-09 1991-07-03 Asahi Optical Co Ltd Lens shutter type zoom lens camera

Also Published As

Publication number Publication date
JPS6227688B2 (en) 1987-06-16

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