WO2020040137A1 - アクセサリおよびプログラム - Google Patents

アクセサリおよびプログラム Download PDF

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Publication number
WO2020040137A1
WO2020040137A1 PCT/JP2019/032443 JP2019032443W WO2020040137A1 WO 2020040137 A1 WO2020040137 A1 WO 2020040137A1 JP 2019032443 W JP2019032443 W JP 2019032443W WO 2020040137 A1 WO2020040137 A1 WO 2020040137A1
Authority
WO
WIPO (PCT)
Prior art keywords
aperture
value
control unit
drive
lens
Prior art date
Application number
PCT/JP2019/032443
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
佐藤　章
Original Assignee
キヤノン株式会社
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 キヤノン株式会社 filed Critical キヤノン株式会社
Publication of WO2020040137A1 publication Critical patent/WO2020040137A1/ja

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
    • G03B17/14—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets interchangeably
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/56—Accessories
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/20—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly in accordance with change of lens
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules

Definitions

  • the present invention relates to an accessory that can be mounted between an interchangeable lens and a camera body and that operates an aperture of the interchangeable lens.
  • An accessory is an accessory that can be mounted between a lens device having an aperture and an imaging device, and a control unit that controls communication with each of the lens device and the imaging device;
  • the control unit transmits a control signal for driving the aperture to the lens device in accordance with the operation of the operation member, and sets a variable range of the set value of the aperture. And transmitting information on the information to the imaging device.
  • a program for detecting an operation of an operation member of an accessory by a computer of an accessory that can be mounted between a lens device having an aperture with a variable aperture diameter and an imaging device. Transmitting a control signal for driving the aperture to the lens device according to a detection result in the step, and transmitting information on a variable range of the set value of the aperture to the imaging device. And is executed.
  • FIG. 1 is a block diagram of a camera system (imaging system) 1.
  • the camera system 1 includes an interchangeable lens (lens device) 2, a camera body (imaging device) 3, and a lens adapter (accessory) 4 that can be mounted between the interchangeable lens 2 and the camera body 3.
  • the interchangeable lens 2 is detachable from the camera body 3.
  • the interchangeable lens 2 can be mounted on the camera body 3 via the lens adapter 4.
  • the lens adapter 4 has a connection mount that enables communication (lens-camera communication) between the interchangeable lens 2 and the camera body 3 at both ends, and one end is detachable from the interchangeable lens 2. The other end is detachable from the camera body 3. With such a configuration, the interchangeable lens 2 and the camera body 3 can be indirectly connected via the lens adapter 4.
  • the interchangeable lens 2 and the camera body 3 have different flange backs, and the lens adapter 4 is designed to fill the difference between the flange backs.
  • the lens adapter 4 may be an adapter used for the interchangeable lens 2 and the camera body 3 having no difference in design of the flange back represented by an extender.
  • the lens adapter 4 is an extender
  • the interchangeable lens 2 or the camera body 3 is configured to be able to recognize that the lens adapter 4 is an extender and extender information such as its magnification.
  • the optical information handled by the interchangeable lens 2 or the camera body 3 is appropriately converted so that appropriate optical information such as a change in focal length and a change in aperture value due to the interposition of the lens adapter 4 as an extender can be handled. , Or the data is preferably switched.
  • the interchangeable lens 2, the lens adapter 4, and the camera body 3 are each mechanically connected via a mount (connector) (not shown).
  • a communication unit 27 is provided on a connector of the interchangeable lens 2.
  • a communication unit 33 is provided on a connector of the camera body 3.
  • Communication units 45 and 46 are provided on the connector of the lens adapter 4.
  • the lens adapter 4 includes an adapter CPU 41, communication units 45 and 46, and an operation member 43.
  • the operation member 43 is an input device that is operable by a user and specifies (instructs) a driving direction (a direction of increasing or decreasing the opening diameter) and a driving amount of the diaphragm 23.
  • the operation member 43 is an aperture ring.
  • the aperture ring (operation member 43) is an operation ring arranged along the outer periphery of the housing of the lens adapter 4, and specifies the drive direction of the aperture 23 by its rotation direction, and controls the drive amount of the aperture 23 by its rotation amount. Can be specified.
  • the operating member 43 is not limited to the aperture ring, and may be configured by another input device such as a rotary selector, an analog stick, or a seesaw switch (seesaw button).
  • the seesaw switch is an operation button configured to be capable of inputting at least two inputs, and the driving direction of the aperture is operated by the operated button, and the driving of the aperture is performed according to the pressing amount or pressing time of the button. The amount and drive speed can be determined.
  • the adapter CPU 41 (control means) is an adapter control means for controlling all the controls in the lens adapter 4 and includes a microcomputer and the like.
  • the adapter CPU 41 has built-in storage means (memory) such as a RAM, a ROM, and an EEPROM, and has a communication unit 42 and an aperture control unit 44.
  • the communication unit 42 controls communication with the camera body 3 and communication with each of the interchangeable lenses 2.
  • the communication unit 42 receives a signal (data) transmitted from the camera body 3 and transmits the signal or a signal based on the signal to the interchangeable lens 2 as necessary.
  • the communication unit 42 receives the signal (data) transmitted from the interchangeable lens 2 and transmits the signal or a signal based on the signal to the camera body 3 as necessary.
  • the communication unit 42 spontaneously performs communication with the interchangeable lens 2 and communication with the camera body 3 as needed, and details thereof will be described later.
  • the aperture control unit 44 acquires operation information (output signal of the operation member 43) from an operation member (aperture ring) 43 based on a user's operation, and controls driving of the aperture 23.
  • Such drive control of the diaphragm 23 based on the operation of the operation member 43 is also referred to as manual diaphragm control. The details of this process will be described later.
  • the interchangeable lens 2 includes a lens CPU 20, an imaging optical system 21, a focus drive circuit 22, an aperture (aperture blades, an aperture mechanism) 23, a stepping motor (drive unit) 25 for driving the aperture 23, an aperture drive circuit 26, and It has a communication unit 27.
  • the lens CPU 20 is a lens control unit that controls all parts of the interchangeable lens 2 and includes a microcomputer and the like.
  • the lens CPU 20 has built-in storage means such as a RAM, a ROM, and an EEPROM, and controls the driving of the stepping motor 25 via the aperture driving circuit 26.
  • the stepping motor 25 and the aperture driving circuit 26 constitute an aperture driving mechanism for driving the aperture 23.
  • the aperture drive circuit 26 drives the stepping motor 25 to change the aperture value of the aperture 23 to change the aperture value (F value) and adjust the light amount.
  • the driving means of the diaphragm 23 is not limited to the stepping motor 25, and another electromagnetic motor such as a DC motor or an AC motor may be used.
  • the communication unit 27 has a plurality of communication terminals for performing communication between the lens CPU 20 and the camera CPU 30, and transmits and receives focus detection information, photometric information, ID information, and the like.
  • a lens adapter 4 is interposed between the lens CPU 20 and the camera CPU 30. Therefore, the lens CPU 20 communicates with the adapter CPU 41 via the communication unit 27 and the communication unit 45 of the lens adapter 4.
  • the camera body 3 includes a camera CPU 30, a control system power supply 31, a drive system power supply 32, a communication unit 33, a lens attachment detection unit 34, a focus detection unit 35, and an image sensor 36.
  • the communication unit 33 has a plurality of communication terminals for performing communication between the camera CPU 30 and the lens CPU 20, and transmits and receives focus detection information, photometric information, ID information, and the like.
  • the lens adapter 4 is interposed between the camera CPU 30 and the lens CPU 20. For this reason, the camera CPU 30 communicates with the adapter CPU 41 via the communication unit 33 and the communication unit 46 of the lens adapter 4.
  • the operation member (aperture ring) 43 will be described.
  • the operation member 43 has a built-in rotation detection mechanism.
  • the adapter CPU 41 aperture control unit 44
  • the rotation detection mechanism includes, but is not limited to, a photoelectric or magnetic rotary encoder, an optical or magnetic encoder, or an encoder including a substrate on which a conductive pattern is printed and a conductive brush. It is not something to be done.
  • FIG. 2 is a sequence diagram of the manual aperture control.
  • the aperture control unit 44 monitors (detects) the operation amount and operation direction of the operation member 43 by the operation of the user. Upon receiving the operation detection (SEQ1) of the operation member 43, the aperture control unit 44 performs a drive amount and drive direction conversion process of the aperture 23. The aperture control unit 44 converts the operation amount and operation direction of the operation member 43 into the drive amount and drive direction of the aperture 23 in the aperture drive amount and drive direction conversion process. At this time, the aperture control unit 44 calculates the relative drive amount of the aperture 23 based on the operation amount of the operation member 43, and determines the drive direction of the aperture 23 based on the operation direction of the operation member 43. In the present embodiment, the drive speed of the aperture 23 in the manual aperture control uses an arbitrary fixed value. For this reason, in the present embodiment, the aperture control unit 44 only needs to transmit at least the driving direction and the driving amount of the aperture 23.
  • the aperture control unit 44 executes an aperture drive request (SEQ2) and (SEQ3) via the communication unit 42 using the above-described drive direction, drive amount, and drive speed of the aperture 23.
  • SEQ2 aperture drive request
  • SEQ3 aperture drive request
  • the method of determining the driving direction, the driving amount, and the driving speed of the diaphragm 23 based on the detection of the operation of the operation member 43 by the diaphragm control unit 44 will be described later in detail.
  • the lens CPU 20 controls the driving of the diaphragm 23 (performs diaphragm driving control) in accordance with the requested driving direction, driving amount, and driving speed based on the diaphragm driving request (SEQ3) received from the adapter CPU 41.
  • the adapter CPU 41 sets the upper brightness limit and the lower brightness limit (minimum F3.2, maximum F3.2) based on the current aperture value (current F3.2) received from the lens CPU 20. Then, the adapter CPU 41 transmits the current aperture value, the brightness upper limit value, and the brightness lower limit value to the camera CPU 30 as optical information. As described above, since the optical information request is transmitted from the camera CPU 30 even during the aperture drive control, the communication unit 42 of the adapter CPU 41 executes SEQ8 to SEQ10 and transmits the optical information response (SEQ11), as described above.
  • the aperture control unit 44 monitors (detects) the operation amount and operation direction of the operation member 43, and counts the operation amount and operation direction of the operation member 43 detected per unit time.
  • the counting method of the present invention is not limited to this, and may be a method of performing aperture drive amount and drive direction conversion processing every time a predetermined operation amount is detected.
  • an arbitrary fixed value is used as the driving speed of the diaphragm 23 in the manual diaphragm control.
  • the aperture control unit 44 executes the aperture drive requests (SEQ2) and (SEQ3) via the communication unit 42.
  • the lens CPU 20 that has received the aperture drive request (SEQ3) controls the drive of the aperture 23 according to the requested drive direction, drive amount, and drive speed.
  • FIG. 3 is a flowchart of manual aperture control. Each step in FIG. 3 is executed by the adapter CPU 41 (communication unit 42, aperture control unit 44) according to a program.
  • step S1 the aperture control unit 44 detects an operation of the operation member 43 by the user (operation detection SEQ1). Subsequently, in step S2, the aperture control unit 44 determines the drive amount and the drive direction of the aperture 23 based on the operation amount and the operation direction of the operation member 43. Then, the communication unit 42 transmits the drive amount and the drive direction determined by the aperture control unit 44 to the interchangeable lens 2 (the lens CPU 20) as a drive command (aperture drive requests SEQ2 and SEQ3).
  • the drive command is a control signal for driving the aperture 23.
  • step S3 the communication unit 42 requests the lens CPU 20 for the current F value (current aperture value) of the aperture 23 in response to the optical information request SEQ4 from the camera CPU 30 (current aperture value request SEQ5).
  • step S4 the communication unit 42 receives the current F value of the aperture 23 (current aperture value response SEQ6) from the lens CPU 20.
  • step S5 the communication unit transmits optical information to the camera body (camera CPU 30) (optical information response SEQ7).
  • the manual aperture function can be realized even in the camera system 1 in which the interchangeable lens 2 having no manual aperture function and the camera body 3 are combined.
  • the lens adapter 4 notifies the camera body 3 of the upper limit value and the lower limit value of the F value as information on the variable range of the set value of the aperture 23, respectively, as the current F value.
  • the AE process in the camera body 3 from issuing a drive command to the diaphragm 23 in order to make the exposure constant.
  • a process for changing the parameter setting (for example, shutter time or ISO setting) related to exposure other than the aperture drive control to make the exposure constant is performed. In other words, it is possible to suppress the issuance of the aperture drive request from the camera CPU 30 while allowing the camera CPU 30 to perform the AE process based on the current F value, and to allow the user to freely control the aperture value (F value).
  • the communication unit 42 transmits information on the variable range of the set value of the aperture 23 to the camera 100 CPU 30.
  • the information on the variable range of the set value of the aperture 23 is represented using the aperture value (F value), but the present invention is not limited to this.
  • the information on the variable range of the set value of the aperture 23 may be represented by a value normalized with respect to a certain F-number, for example, in order to make it easy to handle with a computer.
  • the information on the variable range of the set value of the aperture 23 may be a relative value with respect to the reference light amount value, or may be represented by the light amount value itself. It may be.
  • information on the variable range of the set value of the diaphragm 23 may be represented by a drive step position of the diaphragm 23 (or an absolute coordinate of the diaphragm driving mechanism).
  • the driving step number itself is a value that indirectly expresses the F value.
  • the drive step position of the aperture 23 may be a value expressed as a relative amount from the reference brightness information.
  • an evaluation value of the drive amount of the aperture drive mechanism acquired using an encoder attached to the aperture drive mechanism for example, relative coordinates from the reference position or absolute coordinates May be represented by
  • information corresponding to the F value can be expressed based on the information on the drive position coordinates of the aperture drive mechanism.
  • the upper limit value and the lower limit value as information relating to the variable range of the set value of the diaphragm 23 are both the same value, but these are not necessarily the same value. Even if the aperture 23 is driven by a drive command from the camera CPU 30, a different value may be used as long as it is within a range that does not affect the shooting.
  • This embodiment is different from the first embodiment in a method of determining optical information of the diaphragm 23, that is, a method of calculating optical information responding by SEQ7 and SEQ11 in FIG.
  • the other basic configuration and method of the present embodiment are the same as those of the first embodiment.
  • the adapter CPU 41 has a RAM area (storage unit) for storing an aperture value (F value).
  • the storage unit can store the F value before the drive command issuance and the drive target F value as the aperture value.
  • the F value is stored in the storage unit via the communication unit 42 in the following procedure.
  • the initial values of the F value before the drive command issuance and the drive target F value are the maximum open F values set when the interchangeable lens 2 is started.
  • a maximum open F value is set via the communication unit 42 when the diaphragm 23 is initialized and driven.
  • the drive target F value stored in the storage unit is updated.
  • the adapter CPU 41 detects the completion of driving the aperture 23 through communication with the lens CPU 20, the adapter CPU 41 updates the F value before the drive command issuance in accordance with the aperture drive command.
  • the communication unit 42 of the adapter CPU 41 confirms the drive start time when receiving the optical information requests SEQ4 and SEQ8 from the camera CPU 30.
  • the aperture control unit 44 sets the drive target F value as the current F value, sets the brightness upper limit value and the brightness lower limit value to the same values as the current F value, and responds to the camera CPU 30 (SEQ7, SEQ11).
  • the current F value (Fno) is the F value before the drive command issuance (FnoPRE), the current time Tnow acquired by the timer, the time Treq at which the drive processing request was made, the drive speed Vreq specified at the time of the aperture drive request, the unit drive. It can be calculated using the F value change amount Fref per amount. That is, the current F value is represented by the following equation (1).
  • Fno FnoPRE + Vreq ⁇ (Tnow ⁇ Treq) ⁇ Fref (1)
  • the adapter CPU 41 sets the current F value based on the expression (1), sets the same value as the current F value as the brightness upper limit value and the brightness lower limit value, and responds to the camera CPU 30 with those values as optical information. (SEQ7, SEQ11).
  • This embodiment is different from the first and second embodiments with respect to a method of determining optical information of the diaphragm 23, that is, a method of calculating optical information responding with SEQ7 and SEQ11 in FIG.
  • the other basic configuration and method of the present embodiment are the same as those of the first embodiment.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Structure And Mechanism Of Cameras (AREA)
  • Studio Devices (AREA)
  • Exposure Control For Cameras (AREA)
  • Lens Barrels (AREA)
  • Accessories Of Cameras (AREA)
PCT/JP2019/032443 2018-08-22 2019-08-20 アクセサリおよびプログラム WO2020040137A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018155210A JP7154876B2 (ja) 2018-08-22 2018-08-22 アクセサリおよびプログラム
JP2018-155210 2018-08-22

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WO2020040137A1 true WO2020040137A1 (ja) 2020-02-27

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003057742A (ja) * 2001-08-20 2003-02-26 Nikon Corp 中間リング装置
JP2006178075A (ja) * 2004-12-21 2006-07-06 Olympus Corp カメラ
US20150009585A1 (en) * 2013-07-08 2015-01-08 Global Boom International Limited Lens Adapter
JP2016048396A (ja) * 2015-12-04 2016-04-07 株式会社ニコン アダプター及びカメラシステム
JP2017191310A (ja) * 2016-04-12 2017-10-19 キヤノン株式会社 アダプタおよびカメラシステム
JP2018205711A (ja) * 2017-05-31 2018-12-27 キヤノン株式会社 アクセサリ装置および撮像装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013064945A (ja) 2011-09-20 2013-04-11 Nikon Corp アダプター、カメラシステム、およびアダプター制御プログラム

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003057742A (ja) * 2001-08-20 2003-02-26 Nikon Corp 中間リング装置
JP2006178075A (ja) * 2004-12-21 2006-07-06 Olympus Corp カメラ
US20150009585A1 (en) * 2013-07-08 2015-01-08 Global Boom International Limited Lens Adapter
JP2016048396A (ja) * 2015-12-04 2016-04-07 株式会社ニコン アダプター及びカメラシステム
JP2017191310A (ja) * 2016-04-12 2017-10-19 キヤノン株式会社 アダプタおよびカメラシステム
JP2018205711A (ja) * 2017-05-31 2018-12-27 キヤノン株式会社 アクセサリ装置および撮像装置

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JP7154876B2 (ja) 2022-10-18

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