WO2005094065A1 - Diaphragme et appareil photo numerique utilisant ledit diaphragme - Google Patents

Diaphragme et appareil photo numerique utilisant ledit diaphragme Download PDF

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Publication number
WO2005094065A1
WO2005094065A1 PCT/JP2005/005145 JP2005005145W WO2005094065A1 WO 2005094065 A1 WO2005094065 A1 WO 2005094065A1 JP 2005005145 W JP2005005145 W JP 2005005145W WO 2005094065 A1 WO2005094065 A1 WO 2005094065A1
Authority
WO
WIPO (PCT)
Prior art keywords
aperture
electromagnetic actuator
sector
drive
diaphragm
Prior art date
Application number
PCT/JP2005/005145
Other languages
English (en)
Japanese (ja)
Inventor
Seiichi Oishi
Hiroyuki Koizumi
Eiji Tanaka
Satoru Tada
Hideki Tanaka
Original Assignee
Seiko Precision 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 Seiko Precision Inc. filed Critical Seiko Precision Inc.
Publication of WO2005094065A1 publication Critical patent/WO2005094065A1/fr

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Classifications

    • 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
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/02—Diaphragms
    • G03B9/06—Two or more co-operating pivoted blades, e.g. iris type

Definitions

  • the present invention relates to an aperture device used in a digital camera or the like. More specifically, the present invention relates to an aperture device that suppresses generation of driving noise during driving and is optimal for moving image (movie) mode shooting. Background art
  • a digital still camera dedicated to still images has been added with a moving image shooting function.
  • the sector aperture blade
  • imaging is performed with the sector stopped at that position.
  • the surrounding brightness changes every moment, so it is necessary to adjust the aperture accordingly. Therefore, in the moving image mode, shooting is performed while moving the sector.
  • Patent Document 1 proposes a digital camera that reduces the influence of the drive sound of the aperture.
  • This digital camera is provided with control means for controlling the motor so that the driving sound of the aperture mechanism is input during the sampling period of the analog audio signal to be recorded.
  • the motor drive is controlled so that the drive sound of the aperture mechanism is generated between a certain sampling time and the next sampling time. Therefore, it is possible to prevent the drive sound of the aperture drive mechanism from being recorded simultaneously.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2004-23502
  • Patent Document 1 performs complicated control of driving a motor so that driving sound is input during a sampling period of an audio signal. This control is Rather than driving the motor during the pulling cycle, the control logic makes the driving noise generated when the motor is driven into the sampling cycle, so that the control logic becomes complicated.
  • the technique of Patent Document 1 when the timing at which it is necessary to drive the aperture mechanism in the moving image mode and the sampling period of the audio signal coincide with each other, the motor is controlled in order to suppress the driving noise. It will not be driven. Therefore, the technique proposed in Patent Document 1 may not be able to drive the aperture mechanism in response to a change in ambient brightness.
  • an object of the present invention is to provide an aperture device that can suppress generation of driving noise even when a sector is moved during shooting.
  • the above object is a throttle device comprising: a sector for opening and closing an opening formed in a substrate; an electromagnetic actuator for driving the sector; and control means for controlling driving of the electromagnetic actuator.
  • the means can be achieved by a diaphragm device that executes drive control including a pause step of temporarily stopping the driving of the sector by the electromagnetic actuator while moving the sector to a position where a desired diaphragm state is formed.
  • the drive control executed by the control means has a simple configuration in which a pause step for temporarily stopping the drive of the sector by the electromagnetic actuator is included. Noise can be reduced.
  • the suspending step may temporarily interrupt energization to the electromagnetic actuator. By doing so, heat generation and power consumption of the coil can be suppressed.
  • the drive control may include an intermittent drive control in which a drive step of energizing the electromagnetic actuator and the pause step are alternately repeated. In other words, it is possible to move the sector by intermittent driving that alternately executes the steps of driving and pausing, thereby forming a desired aperture state.
  • control means when the energization of the electromagnetic actuator is cut off, perform an initial setting and then re-drive the electromagnetic actuator.
  • the initial setting at the time of re-driving in this way, even if a position shift occurs due to the stop of the electromagnetic actuator, it can be eliminated.
  • a digital camera provided with the above-described aperture device, it is possible to capture a moving image while suppressing the influence of the driving sound of the electromagnetic actuator.
  • the aperture device in which the generation of driving noise is suppressed by a simple driving control including a pause step of temporarily stopping the driving of the sector by the electromagnetic actuator. Also, when the power to the electromagnetic actuator is temporarily cut off as a pause step, heat generation of the coil can be prevented and power consumption can be reduced.
  • FIG. 1 is a diagram showing a main part configuration of a diaphragm device in a state where a diaphragm aperture is fully opened.
  • FIG. 2 is a diagram showing a diaphragm device when a diaphragm aperture is a minimum diaphragm MN.
  • FIG. 3 is a view showing one sector included in the aperture device.
  • FIG. 4 is a diagram showing an example of a pattern for exciting a coil of a step motor included in a diaphragm device.
  • FIG. 5 is a diagram showing a coil excitation pattern when the sector is moved in the same range as in FIG. 4 by continuous energization as in the related art.
  • FIG. 6 is a diagram showing a relationship between a pause time of a pause step ST and a noise reduction value.
  • FIG. 1 is a diagram showing a main configuration of the diaphragm device 1 in a state where the diaphragm opening is fully opened.
  • FIG. 2 is a diagram showing the diaphragm device 1 when the diaphragm aperture is set to the minimum diaphragm MN.
  • FIG. 3 is a view showing one sector (aperture blade) included in the diaphragm device 1.
  • the diaphragm device 1 includes a substrate 2 on which a circular diaphragm opening 2HL is formed.
  • An aperture ring 5 rotatable in the direction of arrow RM is provided so as to be parallel to the surface of the substrate 2.
  • the aperture ring 5 has a ring opening 5HL at the center.
  • the ring opening 5HL and the stop opening 2HL of the substrate 2 have substantially the same shape, and the stop ring 5 is arranged on the substrate 2 such that the openings overlap.
  • the aperture device 1 includes five sectors 10-1 10-5, and swings in accordance with the rotation of the aperture ring 5 to change the opening degree of the aperture opening 2HL. 5 sectors 10—1— 10—5 Each of them has a point symmetry with respect to the center point CP of the aperture opening 2HL, and is similarly swung by the aperture ring 5 to cooperate to form a predetermined aperture.
  • FIG. 2 is a diagram showing a case where the aperture ring 5 is rotated counterclockwise from the fully opened aperture shown in FIG. 1 to the smallest aperture state.
  • the position of the small aperture opening 2MN is hatched so that the narrowed aperture can be easily checked.
  • FIG. 3 shows a state in which one sector 10-1 included in the aperture device 1 is taken out and the aperture ring 5 swings when rotating from the state of FIG. 1 to the state of FIG. FIG. From FIG. 3, it can be confirmed that when the engagement pin 6-1 moves counterclockwise by the rotation of the aperture ring 5, the sector 10-1 swings clockwise about the fixed shaft 3-1.
  • the other sectors 10-2-10-5 operate in the same manner, so that the aperture 2HL can be reduced as shown in FIG.
  • the configuration of the drive system of the diaphragm device 1 will be described again with reference to FIG.
  • the aperture ring 5 is rotated.
  • the aperture ring 5 has a protruding portion 5PR that protrudes in the radial direction.
  • a tooth row 5GA is formed at the tip of the protrusion 5PR.
  • the gear train 5GA is combined with a wheel train 15 driven by a rotor pinion 21 of a step motor 20 as an electromagnetic actuator.
  • the drive of the step motor 20 is controlled by a control unit 25 serving as control means. Therefore, when the aperture device 1 is incorporated in a camera and used, the control unit 25 receives a predetermined aperture signal from the camera side and controls the stepping motor 20 based on the signal to rotate the aperture ring 5.
  • each sector 10 is moved to a predetermined position to form a target aperture.
  • the control unit 25 switches the current supplied to the two drive coils CA and CB wound around the stator disposed in the step motor 20 to drive the step motor 20. Perform control.
  • the control unit 25 included in the aperture device 1 moves the sector in the moving image mode.
  • the stepping motor 20 is driven so as to suppress generation of driving noise.
  • control of the step motor 20 by the control unit 25 will be described.
  • the image to be shot changes every moment. Accordingly, it is necessary to change the state of the aperture, that is, the position of the sector 10. For example, if the image becomes darker during shooting, it is necessary to move the sector 10 to the side where the aperture is increased. Furthermore, when the captured image becomes brighter thereafter, it is necessary to move the sector 10 to the side where the aperture is reduced.
  • the state of the target aperture a preferred aperture for shooting
  • the sector 10 is continuously moved so as to successively form such changing preferred aperture states. As a result, drive noise was generated in the past, as pointed out earlier.
  • FIG. 4 is a diagram showing an example of a pattern for exciting the coils CA and CB of the step motor 20 when the sector 10 located at a certain position is moved to form a target aperture state. That is, it can be seen that FIG. 4 shows an example of a control pattern of the current supplied from the control unit 25 to the coils CA and CB. Note that Av shown in FIG. 4 represents a predetermined aperture value. Specifically, the aperture area is set to approximately double when the aperture is opened by ⁇ , and conversely, the aperture area is set to approximately 1/2 when the aperture is stopped by ⁇ ⁇ ⁇ .
  • FIG. 4 shows an example of the excitation pattern when the aperture is changed to a small aperture at the upper stage (the aperture value is reduced), that is, when each sector 10 is moved from the state of FIG. 1 to the state of FIG. Is shown.
  • the excitation pattern when the aperture is changed to a large aperture (the aperture value is increased), that is, when each sector 10 is moved from the state of FIG. 2 to the state of FIG. An example is shown.
  • the upper and lower rows shown in FIG. 4 both show examples in which the target aperture state is changed by 2Z3Av from the original state.
  • FIG. 4 It should be noted in FIG. 4 that a pause step ST is inserted between the operation of changing the aperture value of l / 3Av (drive step) and the operation of changing the lZ3Av value first. That is.
  • this pause step ST the power supply to both coils CA and CB is cut off. That is, in the pause step ST, the drive of the step motor 20 is stopped.
  • FIG. 5 is a diagram showing the excitation patterns of the coils CA and CB when the current is continuously applied and the respective sectors 10 are moved in the same range as in FIG. That is, FIG.
  • FIG. 5 does not include the pause step ST of FIG. 4, and the sector 10 is moved so that the aperture value of 2/3 Av changes continuously.
  • the range corresponding to the aperture value of each l / 3Av and the place where the pause step ST is inserted are denoted by reference numerals SP, and are illustrated and checked so that differences from FIG. 4 can be confirmed.
  • FIG. 4 shows the graph.
  • the horizontal axis represents the pause time of the pause step ST, and the vertical axis represents the noise reduction value.
  • the longer the pause step ST is taken the lower the noise level becomes.
  • the longer the pause step ST takes the longer it takes to move the sector.
  • a pause time of about 80 to 90 ms is provided as the pause step ST.
  • the diaphragm blades can be driven in a time that is not much different from the driving time of the diaphragm of the conventional diaphragm device, and the noise is reduced. That is, the diaphragm device 1 can suppress the generation of noise by about 35% as compared with the conventional one by a simple control in which the stop of the step motor 20 is temporarily stopped when the diaphragm is changed. In addition, since no power is supplied during the pause step, the coil can generate heat S. Also, power consumption is reduced.
  • FIG. 4 shows an example in which one stop step ST is inserted between 1/3 Av value aperture operations in the case of changing the aperture value by 2/3 Av.
  • the pause step ST may be set at least twice and intermittent drive may be repeated.
  • the aperture value changed in one operation may be changed as appropriate, and a different aperture value may be set without dividing the target aperture value equally.
  • the energization of the idle step ST In stearyl Ppumota 20 is interrupted, there is a case where the initial setting force adjusted by the initial initial excitation, the position of al the step motor 20 is changed. Therefore, when the next 1/3 Av operation is started (when re-driving) as shown in FIG. 4, it is desirable to perform the initial excitation PR again to substantially drive the force step motor 20.
  • Fig. 4 shows an example in which the energization is turned off in the pause step. Alternatively, the step motor 20 may be temporarily stopped.
  • FIG. 4 shows a case where the step motor 20 is driven by 1_2-phase excitation as an example.
  • the step motor 20 is driven by two-phase excitation, the generation of driving noise can be similarly suppressed.
  • the diaphragm device 1 described above can suppress the generation of driving noise even when the sector 10 moves continuously by simply controlling the step motor 20. Therefore, a digital camera incorporating such an aperture device 1 can capture a moving image while suppressing the generation of noise in the moving image mode.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Diaphragms For Cameras (AREA)
  • Studio Devices (AREA)
  • Shutters For Cameras (AREA)

Abstract

Un diaphragme (1) comporte : des secteurs (10-1 à 10-5) pour ouverture/fermeture d’une ouverture (2HL) formée dans un substrat (2) ; un actionneur électromagnétique (20) excitant les secteurs ; et un moyen de commande (25) pour commander l’entraînement de l’actionneur électromagnétique. Le moyen de commande (25) supervise l’entraînement et contient une phase d’arrêt ST pour interrompre temporairement l’entraînement des secteurs (10-1 à 10-5) par l’actionneur électromagnétique pendant le déplacement des secteurs (10-1 à 10-5) vers la position de formation d’un état de diaphragme cible. Selon la présente invention, grâce à la simple configuration selon laquelle le moyen de commande possède une phase d’arrêt pour interrompre temporairement l’entraînement des secteurs par l’actionneur électromagnétique, il est possible de supprimer le bruit, à la différence du cas de figure dans lequel l’actionneur électromagnétique est entraîné en continu.
PCT/JP2005/005145 2004-03-25 2005-03-22 Diaphragme et appareil photo numerique utilisant ledit diaphragme WO2005094065A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-090685 2004-03-25
JP2004090685A JP4908741B2 (ja) 2004-03-25 2004-03-25 絞り装置およびこれを用いたデジタルカメラ

Publications (1)

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WO2005094065A1 true WO2005094065A1 (fr) 2005-10-06

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TW (1) TWI264613B (fr)
WO (1) WO2005094065A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3145532U (ja) * 2008-07-30 2008-10-09 日本精密測器株式会社 絞り装置
JP5015225B2 (ja) 2009-11-20 2012-08-29 セイコープレシジョン株式会社 絞り装置
JP6172955B2 (ja) * 2013-01-30 2017-08-02 キヤノン株式会社 光量調整装置、レンズ鏡筒および撮像装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10136693A (ja) * 1996-10-31 1998-05-22 Sankyo Seiki Mfg Co Ltd モータユニットの制御方法およびモータユニットならびにモータ式ダンパー装置
JP2004023502A (ja) * 2002-06-18 2004-01-22 Fuji Photo Film Co Ltd デジタルカメラ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05195740A (ja) * 1992-01-24 1993-08-03 Yamaha Motor Co Ltd ２サイクルエンジンの潤滑油供給装置
JPH0965639A (ja) * 1995-08-25 1997-03-07 Seikosha Co Ltd ステップモータ及びステップモータ駆動シャッタ
JPH11316402A (ja) * 1999-03-12 1999-11-16 Seiko Precision Inc モ―タ駆動式シャッタ付カメラ
JP2001136790A (ja) * 1999-11-08 2001-05-18 Canon Inc ステッピングモータの駆動制御方法及び装置
JP4298126B2 (ja) * 2000-04-05 2009-07-15 キヤノン株式会社 画像形成装置
JP2002072327A (ja) * 2000-08-23 2002-03-12 Minolta Co Ltd カメラ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10136693A (ja) * 1996-10-31 1998-05-22 Sankyo Seiki Mfg Co Ltd モータユニットの制御方法およびモータユニットならびにモータ式ダンパー装置
JP2004023502A (ja) * 2002-06-18 2004-01-22 Fuji Photo Film Co Ltd デジタルカメラ

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JP2005275177A (ja) 2005-10-06
TWI264613B (en) 2006-10-21
TW200540556A (en) 2005-12-16

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