WO2005002029A1 - ステップモータ - Google Patents
ステップモータ Download PDFInfo
- Publication number
- WO2005002029A1 WO2005002029A1 PCT/JP2004/009099 JP2004009099W WO2005002029A1 WO 2005002029 A1 WO2005002029 A1 WO 2005002029A1 JP 2004009099 W JP2004009099 W JP 2004009099W WO 2005002029 A1 WO2005002029 A1 WO 2005002029A1
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- WIPO (PCT)
- Prior art keywords
- magnetic pole
- rotor
- coil
- state
- magnetic
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
- H02K37/10—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type
- H02K37/12—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets
- H02K37/14—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets with magnets rotating within the armatures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
- H02K37/10—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type
- H02K37/12—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets
- H02K37/14—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K37/16—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets with magnets rotating within the armatures having horseshoe armature cores
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/15—Mounting arrangements for bearing-shields or end plates
Definitions
- the present invention relates to a small step motor capable of generating a sufficient detent torque.
- the present invention also relates to a drive mechanism inside the camera employing the step motor.
- Patent Document 1 proposes a step motor provided with a magnetic member that applies a locking force so that the rotor comes to a predetermined position without causing vibration when the coil is not energized. With such a step motor, power consumption can be suppressed while stopping the rotor at an accurate position when the motor stops.
- Patent Document 2 discloses an invention relating to a shutter of a digital camera, and proposes a shutter structure in which the open or closed state of the shutter can be maintained even when no power is supplied to reduce power consumption.
- Patent Document 1 JP 2001-61268 A
- Patent Document 2 Japanese Patent Application Laid-Open No. 2003-21857
- an object of the present invention is to solve the above-mentioned problems and to provide a step motor capable of obtaining a required detent torque with a simple structure. Also, such a step mode It is also an object to provide a drive mechanism for a camera that includes a camera.
- the object is to provide a rotor having four magnetic poles, a first magnetic pole excited by a first coil, a second magnetic pole excited by a second coil, and an excitation by the first and second coils.
- the first magnetic pole and the second magnetic pole and the rotor so that magnetic attraction is generated between the magnetic pole of the rotor and the first magnetic pole and the second magnetic pole.
- the gap D between the third magnetic pole and the rotor is achieved by a step motor formed to be larger than the gap d.
- a strong magnetic attraction (magnetic coupling force) is generated between the first magnetic pole and the second magnetic pole and the rotor, so that sufficient detent torque can be obtained when the coil is not energized. it can.
- This detent torque is a large torque because the two magnetic pole portions on the stator side and the two magnetic poles on the rotor side are based on a magnetic attraction force that is a set of two. Therefore, when the stepping motor of the present invention is applied to a shutter driving section of a camera or the like, the shutter state can be reliably maintained even when power is not supplied.
- Such a step motor has a simple structure and can reliably suppress power consumption, so that it can be provided as a low-cost and energy-saving step motor.
- the rotor has a cylindrical shape, and a substantially U-shaped stator is disposed so as to face an outer peripheral surface of the rotor.
- the first magnetic pole and the stator are provided at both ends of the stator.
- a structure in which a second magnetic pole is set and the third magnetic pole is set at a central position of the stator can be adopted as an example.
- the first coil is disposed between the first magnetic pole and the third magnetic pole of the stator
- the second coil is disposed between the second magnetic pole and the third magnetic pole. It is desirable to have a projection for preventing the first and second coils from being displaced. With such an embodiment, the first coil and the second coil can be reliably positioned at predetermined positions.
- a step motor having the above configuration, an engagement pin connected to a rotor of the step motor and performing a rotation operation within a predetermined range, and an engagement hole in which the engagement pin is engaged
- a driving mechanism of the camera can be formed including a sector that moves between a position where the imaging opening formed in the substrate is closed and a position where the imaging opening is opened in accordance with the rotation of the engagement pin.
- This drive mechanism is a step that can generate the strong and detent torque described above. Since the motor is included, the sector can be held in a desired state when the power is not supplied.
- the sector may include a shutter blade and an aperture blade. By appropriately combining these blades, it is possible to set a fully open, fully closed, small aperture, etc. state in the photographing opening formed on the shirt substrate, and to maintain the shirt state without power supply.
- a step motor can be obtained.
- such a step motor has a simple structure and can reliably suppress power consumption, so that it can be provided as a low-cost and energy-saving step motor.
- FIG. 1 is a diagram showing a configuration of a main part of a step motor according to the embodiment.
- the step motor 1 includes a rotor 2 disposed in the center and rotatable in both directions, and a stator 3 disposed outside the rotor 2 so as to face the rotor 2.
- the rotor 2 has a circular cross section and a cylindrical shape.
- the stator 3 is integrally formed with a substantially U-shaped cross section, and is arranged so as to house the rotor 2 in its internal space.
- FIG. 1 shows the stepping motor 1 in a state where the open side of the U-shape of the stator 3 faces upward.
- the rotor 2 has a four-pole configuration including two N poles and two S poles.
- the motor 2 is a permanent magnet magnetized at a position where the same magnetic poles are opposed to each other, and is set to be rotatable around the shaft 21 in both directions.
- Both ends of the stator 3 having the U shape are formed so as to face the peripheral surface of the rotor 2. These become the first magnetic pole 11 and the second magnetic pole 12, respectively.
- the third magnetic pole 13 is arranged at an intermediate position between the first magnetic pole 11 and the second magnetic pole 12.
- a first coil 4 is wound between the first magnetic pole 11 and the third magnetic pole 13, and a second coil 5 is wound between the second magnetic pole 12 and the third magnetic pole 13. ing.
- the first magnetic pole 11 is excited when the first coil 4 is energized
- the second magnetic pole 12 is excited when the second coil 5 is energized.
- the third magnetic pole 13 is provided by both the first coil 4 and the second coil 5. Is excited. Therefore, the excited state of the third magnetic pole 13 appears as a state in which the state of energization of the first coil 4 and the second coil 5 is combined.
- the current control circuit 25 connected to the first coil 4 and the second coil 5 of the step motor 1 is indicated by a dotted line.
- a current for exciting the first coil 4 and the second coil 5 is supplied from the current control circuit 25.
- Two patterns are set for this current supply.
- a current for exciting both the first coil 4 and the second coil 5 is supplied from the current control circuit 25, and the driving state of the rotor 2 is changed by switching the current supply direction for each coil. Is controlled.
- the first pattern there are a state in which the first magnetic pole 11 and the second magnetic pole 12 are both excited to the same magnetic pole, and a state in which the first magnetic pole 11 and the second magnetic pole 12 are excited to different magnetic poles.
- the resulting magnetic field at the third magnetic pole 13 is stronger when both the first magnetic pole 11 and the second magnetic pole 12 are excited to the same magnetic pole. Conversely, when the first magnetic pole 11 and the second magnetic pole 12 are excited by mutually different magnetic poles, the magnetization at the third magnetic pole 13 is canceled out and becomes a non-magnetized state.
- a current for exciting either the first coil 4 or the second coil 5 is supplied from the current control circuit 25, and by switching the current supply direction, the current of the rotor 2 is changed.
- the driving state is controlled.
- only the first magnetic pole 11 side or the second magnetic pole 12 side is excited, and the magnetic pole is switched to the opposite magnetic pole by changing the current supply direction.
- the third magnetic field 13 in the second pattern is excited by a magnetic pole that is a counter electrode of the excited first magnetic pole 11 or the second magnetic pole 12.
- the driving of the rotor 2 is controlled in a two-phase excitation state in which the first coil 4 and the second coil 5 are excited.
- the driving of the rotor 2 is controlled in a one-phase excitation state in which only one of the first coil 4 and the second coil 5 is excited.
- the rotor 2 has a four-pole configuration, and in particular, a sufficient detent torque is obtained in a non-energized state in which the first coil 4 and the second coil 5 are not energized. It has a structure that can be used. This will be described.
- the distance between the peripheral surface of the rotor 2 and the first magnetic pole 11 and the second magnetic pole 12 is the same gap d. .
- the gap d is set to have a narrow distance with which a sufficient magnetic attraction force can be obtained with the magnetic pole on the rotor 2 side.
- the gap D between the peripheral surface of the rotor 2 and the third magnetic pole 13 is set to be larger than the gap d.
- This gap D affects the magnetic attractive force generated between the third magnetic pole 13 and the rotor 2 and the magnetic attractive force generated between the first magnetic pole 11 and the second magnetic pole 12 and the rotor 2. Not set with sufficient distance.
- the gap D is made about 1.3 times the gap d.
- the first magnetic pole 11 and the second magnetic pole 12 and the two magnetic poles on the rotor 2 each attract magnetically strongly, and the third magnetic pole 13 does not obstruct the magnetic relationship. It is realized. Therefore, in the non-energized state, as illustrated in FIG. 1, the two poles on the rotor 2 are stabilized at a position just opposite to the first magnetic pole 11 and the second magnetic pole 12, respectively. In the present step motor 1, since there are two places (two sets) where magnetic attraction occurs when no power is supplied, a strong detent torque can be obtained.
- the step motor 1 can stably hold the rotor at a predetermined position in a non-conductive state, and is suitably employed, for example, in a camera driving unit or the like of a camera, and can stably hold the shutter in a desired state.
- FIG. 2 shows the case of the above-described first current supply pattern, in which the rotor 2 is rotated by two-phase excitation in which the first coil 4 and the second coil 5 are excited.
- FIGS. 3 and 4 show the second pattern described above, and show a case where the rotor 2 is rotated by one-phase excitation in which only one of the first coil 4 and the second coil 5 is excited. ing.
- FIG. 3 particularly shows a case where the first coil 4 is excited
- FIG. 4 shows a case where the first coil 5 is excited.
- the current supply to the coils 4 and 5 shown in FIGS. 2 to 4 is performed by the current control circuit 25 shown in FIG. 1. In these figures, illustration is omitted. 3 and 4 show only the energized coil for easy understanding.
- FIG. 2 shows the first pattern described above, in which the first coil 4 and the second coil 5 are excited, and the rotor 2 is rotated clockwise (clockwise) at a step angle of 45 °.
- FIG. 2A shows a state in which the coils 4 and 5 are not energized.
- Figure 2 (b) shows a case in which the rotor 2 is rotated clockwise by controlling the current supplied to the coils 4 and 5 in time series.
- the N and S magnetic poles of the rotor 2 have strong detent torque as described above. At the position opposite to the first and second magnetic poles 11 and 12.
- FIG. 2B shows a case where the first and second coils 4 and 5 are energized from the state of FIG. 2A and both the first magnetic pole 11 and the second magnetic pole 12 are excited to the S pole. Is shown. At this time, the N pole is doubled and excited at the third magnetic pole 13.
- FIG. 2 (c) shows a case where the excitation state of the first magnetic pole 11 is maintained at the S pole from the state of FIG. 2 (b), and the second magnetic pole 12 is excited to the opposite N pole. I have. At this time, since the N pole and the S pole are excited in the third magnetic pole 13, they cancel each other and become a non-magnetized state. Similarly, FIG.
- FIG. 2 (d) shows a case where both the first magnetic pole 11 and the second magnetic pole 12 are excited to the N pole from the state of FIG. 2 (c). At this time, the S pole is doubled and excited at the third magnetic pole 13.
- FIG. 2 (e) shows a case where the excitation state of the first magnetic pole 11 is maintained at the N pole from the state of FIG. 2 (d), and the second magnetic pole 12 is excited to the opposite S pole. I have. At this time, since the N pole and the S pole are excited in the third magnetic pole 13, they cancel each other and become a non-magnetized state.
- each figure in FIG. 2 shows the motor 2 at the position where the first and second coils 4 and 5 are energized and the 45 ° rotation is completed.
- FIG. 2 (a) showing a non-energized state.
- motor 1 the gap d between the first magnetic pole 11 and the second magnetic pole 12 and the rotor 2 is formed to be narrow, so that the first magnetic pole 11 and the second magnetic pole 12 and the two magnetic poles on the rotor 2 side are connected. Since a strong magnetic attraction force is generated between them, the state shown in FIG. 2A is reliably maintained by the detent torque even when no power is supplied.
- FIG. 3 shows the case of the above-described second current supply pattern, and shows a case where the rotor 2 is rotated clockwise by 90 ° by one-phase excitation in which only the first coil 4 is excited.
- FIG. 3A shows a state where the coils 4 and 5 are not energized.
- FIGS. 3 (b) to 3 (e) show a time series in which the current supplied to the coil 4 is controlled to rotate the rotor 2 clockwise by 90 °.
- the current supplied to the first coil 4 is switched in the opposite direction, so that the magnetic pole generated in the first magnetic pole 11 is inverted.
- the magnetic pole generated in the third magnetic pole 13 is opposite to the first magnetic pole.
- the second magnetic pole 12 since the second magnetic pole 12 does not receive excitation from the coil, it becomes a magnetic pole integral with the third magnetic pole 13.
- FIG. 3 (a) shows that the first magnetic pole 11 and the second magnetic pole 12 are not excited and are similar to FIG. 2 (a), and the N and S magnetic poles of the rotor 2 have strong detents.
- the first and second magnetic poles 11 and 12 are held at positions opposed to each other by torque.
- FIG. 3B shows a case where the first coil 4 is energized from the state of FIG. 3A and the first magnetic pole 11 is excited to the S pole. At this time, the third magnetic pole 13 and the second magnetic pole are excited to the N pole.
- FIG. 3 (c) shown below the excitation state of the first magnetic pole 11 is switched to the N pole from the state of FIG. 3 (b), and the third magnetic pole 13 and the second magnetic pole 12 are excited to the opposite S pole.
- FIG. 3 (d) shows a case where both the first magnetic poles 11 are excited to the S pole from the state of FIG. 3 (c). At this time, the third magnetic pole 13 and the second magnetic pole 12 are excited to the N pole.
- FIG. 3 (e) the first magnetic pole 11 is switched to the N pole from the state of FIG. 3 (d), and the third magnetic pole 13 and the second magnetic pole 12 are excited to the opposite S pole.
- FIG. 4 shows a case of the above-described second current supply pattern, in which only the second coil 5 is provided.
- This figure shows a case where the rotor 2 is rotated counterclockwise by a step angle of 90 ° by one-phase excitation.
- FIG. 4 shows the operation exactly opposite to that of FIG.
- the magnetization state of the magnetic poles 11 to 13 on the stator 3 side sequentially changes, the rotor 2 rotates counterclockwise by 90 ° as shown in the figure.
- the two magnetic fields of the rotor 2 are directly opposed to the first magnetic pole 11 and the second magnetic pole 12, respectively. Therefore, the state at that time can be maintained by the detent torque even when the power supply to the coil 5 is cut off.
- the step motor 1 has a strong detent torque when the coils 4 and 5 are not energized, based on the structure in which a strong magnetic attraction force is generated between the first and second magnetic poles and the rotor. Is provided. Also, as described above, the same applies to both the case where the step angle is set to 45 ° by two-phase excitation and the case where the step angle is set to 90 ° by eye excitation.
- FIG. 5 is a view showing a stator having a preferred shape to be used in the present step motor 1.
- the first magnetic pole 11 and the second magnetic pole 12 of the stator 3 are formed in a vertically elongated shape so as to face the peripheral surface of a port (not shown) and correspond to the length in the longitudinal direction of the rotor.
- Stator 3 has arms 31 and 32 on both sides, and arms 31 and 32 are connected to base 35.
- the third magnetic pole 13 is formed at the center of the base 35.
- the third magnetic pole 13 is also formed in a vertically long shape similar to the first magnetic pole 11 and the second magnetic pole 12.
- coils 4 and 5 for exciting the first to third magnetic poles are wound around the arm portions 31 and 32, respectively.
- Projections 33 and 34 are formed at the rear end of each arm for positioning the coils 4 and 5.
- a structure is realized in which the coils 4 and 5 wound around the respective arms 31 and 32 can be reliably positioned.
- a concave portion 3739 is formed above each of the magnetic poles 11 and 13.
- the step motor 1 shown in the present embodiment is modularized by setting cases on the upper and lower sides thereof. These recesses 3739 are used for positioning when setting the case.
- FIG. 6 is a perspective view showing an external appearance of the step motor 1 in a case where it is modularized including a main part structure of the step motor 1 described above. Note that in FIG. 6 as well, the parts shown in FIGS. The same reference numerals are given to the parts corresponding to the positions.
- FIG. 6 shows an integrated module in which an upper case 7 and a lower case 8 are set on the upper and lower sides of the main part configuration, respectively.
- the step motor can be provided with energy consumption.
- it since it has a simple structure in which the arrangement interval between the contactor and the magnetic pole of the stator is changed, it can be realized at low cost.
- FIG. 7 (A) is a diagram schematically showing a state in which the step motor 1 is arranged on the shirt substrate 50 in a plan view.
- the shirt board 50 has a lens opening 51 for photographing as described later.
- three sectors 60, 65 and 70 are arranged along the board surface. These sectors are the first shirt blade 60, the second shirt blade 65, and the aperture blade 70 from the side of the shirt board 50.
- the step motor 1 is arranged on the back side of the shirt board 50.
- the first shutter blade 60 engages with the hole that engages with the projection 61 provided on the substrate 50 and the engagement pin 27 that extends from the rotor 2. It has a hole to make.
- the second shutter blade 65 has a hole that fits into the protrusion 66 provided on the substrate 50 and a hole that engages with the engaging pin 27 extending from the rotor 2.
- the aperture blade 70 has a hole that engages with the projection 71 provided on the substrate 50 and a hole that engages with the engagement pin 27 extending from the rotor 2.
- An arm 26 extending in the radial direction is connected to the rotor 2 of the step motor 1 disposed on the back side of the substrate 50.
- An engagement pin 27 extending from the end of the arm portion 26 to the opposite side through an opening 55 provided on the shirt substrate 50 side is connected.
- the engagement pins 27 protruding to the front side are attached to the first shirt blade 60, the second shirt blade 65, and the aperture blade 70, respectively. Are engaged with each other. Therefore, when the rotor 2 of the step motor 1 rotates, the engaging pin 27 rotates in conjunction therewith, and the first shutter blade 60, the second shutter blade 65, and the aperture blade 70 move in a predetermined path. To rock.
- FIG. 7 (B) is a diagram showing a movement locus CR of the engagement pin 27.
- the engaging pin 27 is capable of rotating 360 ° with the rotation of the rotor 2.
- the opening 55 formed in the substrate 50 is fan-shaped, and a member 29 for regulating the movement of the arm 26 is provided. . Therefore, in this example, the engagement pin 27 is set to rotate within the predetermined range RE.
- This range RE is set to, for example, a central angle of about 120 °.
- FIGS. 8 to 10 A case where the driving mechanism of the shirt unit having the above configuration is operated will be described with reference to FIGS. 8 to 10.
- Each of these figures shows a state in which the positions of the first shutter blade 60, the second shutter blade 65, and the aperture blade 70 change as viewed from the front side of the shirt substrate 50.
- a step motor 1 is shown at the top of each of the figures so that the rotation state of the rotor 2 can be checked.
- FIG. 8 shows a state in which the lens opening 51 for photographing provided on the substrate 50 is fully opened.
- the symbol CR in FIG. 8 corresponds to FIG. 7 (B).
- the rotor 2 of the step motor 1 is stopped by the regulating member 29 at a rotation angle of 0 °, for example, at a position slightly closer to FIG. 2 (b) than FIG. 2 (a).
- Each of the N and S magnetic poles of the rotor 2 is held in a state where it is regulated by the regulating member 29 so as to move to a position facing the first and second magnetic poles 11 and 12 by the detent torque. Therefore, the state of the shirt can be maintained without energizing the coils 4 and 5 in the state shown in FIG.
- the shirt state can be reliably maintained.
- a hole 62 that engages with the projection 61 of the first shutter blade 60, a hole 67 that engages with the projection 66 of the second shirt blade 65, and a hole that engages with the projection 71 of the diaphragm blade 70. 72 is shown. Further, the engagement hole that engages with the engagement pin 27 can be confirmed by the engagement hole 73 of the aperture blade 70 on the near side.
- the position of the rotor 2 of the step motor 1 shown in the upper part of FIG. 8 is slightly smaller than the position of the rotor 2 in the non-energized state shown in FIG. 2A (about 25 ° in the present embodiment). It is in the clockwise direction. In this drive mechanism, such a displacement occurs.
- the positional relationship between the engagement pin 27 and the regulating member 29 (see FIG. 7B) is set. With this setting, each magnetic pole of the rotor 2 always tries to move to a position facing the first and second magnetic poles 11 and 12, so that a state where detent torque is constantly generated can be achieved. Therefore, each blade 60, 65, 70 can be stably held at a predetermined position by the detent torque.
- FIG. 9 shows a state in which the lens opening 51 for photographing provided on the substrate 50 is fully closed.
- FIG. 9 shows a state in which the rotor 2 has been rotated clockwise by about 65 ° from the state shown in FIG. 8, and the engagement pin 27 rotates in conjunction with this.
- the first shirt blade 60, the second shirt blade 65, and the diaphragm blade 70 swing along a predetermined trajectory, and are moved by the first shirt blade 60 and the second shirt blade 65.
- the lens opening 51 is closed.
- the rotor 2 of the step motor 1 rotates clockwise, for example, as shown in FIG. 2 (c).
- the N and S magnetic poles of the rotor 2 are held by the detent torque at the positions just facing the first and second magnetic poles 11 and 12, respectively. Therefore, even in the case shown in FIG. 9, even when the power to the coils 4 and 5 is cut off in this state, the shirt can be held in this closed state.
- This state holding force is large enough to hold the camera even if a slight impact is applied to the camera.
- FIG. 10 is a diagram showing a state in which aperture blades are positioned at a lens opening 51 for photographing provided on a substrate 50 to form a small aperture.
- FIG. 10 shows a state in which the rotor 2 is further rotated clockwise from the state of FIG. 9. The energization is performed twice in FIG. 2 (e) after FIG. 2 (d).
- the engagement pin 27 rotates in conjunction with this. With the rotation of the engagement pin 27, the first shirt blade 60, the second shirt blade 65, and the diaphragm blade 70 swing along a predetermined trajectory, and the first shirt blade 60 and the second shirt blade 65 It moves away to the position where the opening 51 is opened, and the diaphragm blade 70 comes to the position where the lens opening 51 is closed instead.
- the aperture blade 70 has the aperture opening 75, a state in which the lens aperture 51 has a small aperture is realized.
- the rotor 2 of the step motor 1 rotates clockwise and is stopped by the regulating member 29, for example, at a position slightly closer to FIG. 2 (d) than FIG. 2 (e).
- the position of the rotor 2 in the non-energized state is slightly shifted in the counterclockwise rotation direction.
- the position of each blade is maintained, so that the small aperture state can be maintained.
- the state shown in FIG. 8 or FIG. 10 can be moved from the state shown in FIG. 9 to the state shown in FIG. 9 by applying the current shown in FIG. 2 (c) once, but when the state shown in FIG. To move the two energizations shown in Fig. 2 (a) after (b) to the state shown in Fig. 9 from the state shown in Fig. 9 to the state shown in Fig. 10 as described above, follow Fig. 2 (d) and Fig. 2 (e). Energize twice.
- the fully open, front closed and small aperture states shown in FIGS. 8 to 10 can be held even when no power is supplied. It can be provided as a mechanism that measures power saving.
- the shutter driving mechanism an example in which two shutter blades and one diaphragm blade are driven by a step motor is shown, but the number of shirt blades and diaphragm blades is not limited to this mode. May be changed as needed.
- FIG. 1 is a diagram showing a configuration of a main part of a step motor according to an embodiment.
- FIG. 2 is a diagram showing a case where the rotor of the step motor according to the embodiment is rotated by two-phase excitation.
- FIG. 3 is a view showing a case where the stepping motor according to the embodiment is rotated clockwise by the rotor force S1 phase excitation.
- FIG. 4 is a view showing a case where the stepping motor according to the embodiment is rotated counterclockwise by the rotor force S1 phase excitation.
- FIG. 5 is a view showing a stator having a preferable shape to be used in a step motor.
- FIG. 6 is a perspective view showing the appearance of a modular motor including the structure of a step motor.
- FIG. 7 (A) is a diagram schematically showing, in plan view, a state in which the stepper motor of FIG. 1 is arranged on a shirt substrate, and (B) is a diagram showing a movement locus of an engagement pin. .
- FIG. 8 is a view showing a state in which a lens opening for photographing provided on a substrate is fully opened.
- Garden 9] is a diagram showing a state in which the imaging lens opening provided on the substrate is fully closed.
- Garden 10] is a diagram showing a state in which the aperture of the imaging lens provided on the substrate is set to a small aperture.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Shutters For Cameras (AREA)
- Control Of Stepping Motors (AREA)
- Diaphragms For Cameras (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/388,871 US7211910B2 (en) | 2003-06-30 | 2006-03-24 | Step motor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-188981 | 2003-06-30 | ||
JP2003188981A JP4271514B2 (ja) | 2003-06-30 | 2003-06-30 | ステップモータ |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US10562000 A-371-Of-International | 2004-06-28 | ||
US11/388,871 Continuation US7211910B2 (en) | 2003-06-30 | 2006-03-24 | Step motor |
Publications (1)
Publication Number | Publication Date |
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WO2005002029A1 true WO2005002029A1 (ja) | 2005-01-06 |
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PCT/JP2004/009099 WO2005002029A1 (ja) | 2003-06-30 | 2004-06-28 | ステップモータ |
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JP (1) | JP4271514B2 (ja) |
KR (1) | KR100745729B1 (ja) |
CN (1) | CN100495871C (ja) |
WO (1) | WO2005002029A1 (ja) |
Families Citing this family (4)
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JP2007233053A (ja) * | 2006-03-01 | 2007-09-13 | Canon Electronics Inc | 光量調節装置および光学撮像機器 |
JP6770450B2 (ja) * | 2017-01-25 | 2020-10-14 | 日本電産コパル株式会社 | 羽根駆動装置及びこの羽根駆動装置を備えた撮像機器 |
KR102581631B1 (ko) * | 2018-06-26 | 2023-09-22 | 미쓰미덴기가부시기가이샤 | 회전 왕복 구동 액추에이터 |
JP7140980B2 (ja) | 2019-12-13 | 2022-09-22 | ミツミ電機株式会社 | 回転往復駆動アクチュエーター |
Citations (3)
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---|---|---|---|---|
CH625646A5 (en) * | 1979-07-06 | 1981-09-30 | Ebauches Sa | Electromagnetic motor with two directions of rotation |
JPS5980147A (ja) * | 1982-10-29 | 1984-05-09 | Rhythm Watch Co Ltd | 時計用小型モ−タ |
JP2001033844A (ja) * | 1999-07-15 | 2001-02-09 | Olympus Optical Co Ltd | 露出調整装置及びこれを使用する電子カメラ |
-
2003
- 2003-06-30 JP JP2003188981A patent/JP4271514B2/ja not_active Expired - Fee Related
-
2004
- 2004-06-28 KR KR1020057024419A patent/KR100745729B1/ko not_active IP Right Cessation
- 2004-06-28 WO PCT/JP2004/009099 patent/WO2005002029A1/ja active Application Filing
- 2004-06-28 CN CNB200480018739XA patent/CN100495871C/zh active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH625646A5 (en) * | 1979-07-06 | 1981-09-30 | Ebauches Sa | Electromagnetic motor with two directions of rotation |
JPS5980147A (ja) * | 1982-10-29 | 1984-05-09 | Rhythm Watch Co Ltd | 時計用小型モ−タ |
JP2001033844A (ja) * | 1999-07-15 | 2001-02-09 | Olympus Optical Co Ltd | 露出調整装置及びこれを使用する電子カメラ |
Also Published As
Publication number | Publication date |
---|---|
JP2005027408A (ja) | 2005-01-27 |
JP4271514B2 (ja) | 2009-06-03 |
CN1816960A (zh) | 2006-08-09 |
CN100495871C (zh) | 2009-06-03 |
KR100745729B1 (ko) | 2007-08-02 |
KR20060024430A (ko) | 2006-03-16 |
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