CN1816960A - Step motor - Google Patents
Step motor Download PDFInfo
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- CN1816960A CN1816960A CNA200480018739XA CN200480018739A CN1816960A CN 1816960 A CN1816960 A CN 1816960A CN A200480018739X A CNA200480018739X A CN A200480018739XA CN 200480018739 A CN200480018739 A CN 200480018739A CN 1816960 A CN1816960 A CN 1816960A
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- 239000000758 substrate Substances 0.000 claims description 23
- 230000007246 mechanism Effects 0.000 claims description 15
- 230000033001 locomotion Effects 0.000 claims description 11
- 230000005415 magnetization Effects 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 230000005284 excitation Effects 0.000 description 44
- 230000005281 excited state Effects 0.000 description 12
- 238000004134 energy conservation Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001932 seasonal effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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
- 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
- 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
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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
A step motor is disclosed which comprises a rotor having four magnetic poles, a first magnetic pole which is excited by a first coil, a second magnetic pole which is excited by a second coil, and a third magnetic pole which is excited by the first and second coils. A gap (d) between the first or second magnetic pole and the rotor is so set that there occurs a magnetic attraction between a magnetic pole of the rotor and the first or second magnetic pole, and a gap (D) between the third magnetic pole and the rotor is formed lager than the gaps (d). When such a step motor is used in a shutter driving unit of a camera or the like, the open/closed state of the shutter can be surely kept even when no current is applied.
Description
Technical field
Present invention relates in general to a kind of small type stepping motor that can produce enough brake torques (detent torque), more specifically, relate to the driving mechanism in the video camera that uses above-mentioned stepping motor.
Background technology
In recent years, video camera has become electronic equipment, and its shutter is by step motor drive.In this class video camera, wherein can suppress battery consumption and when no power, also can keep shutter disk (shutter blade) and the structure of diaphragm sheet (diaphragm blade) is desirable even comprise.Therefore, for example patent documentation 1 has proposed a kind of stepping motor, this stepping motor the latching force of providing (lock force) is provided so that when electric current not during flowing through coil rotor arrive given position and non-oscillatory magnetic part.Use this stepping motor, can when stopping motor, make rotor be parked in correct position and can suppress power consumption.In addition, patent documentation 2 discloses a kind of invention that relates to the shutter that is used for digital camera, and has proposed a kind of tripper, thus, even shutter also can be held open or be closed when no power, and has suppressed power consumption.
Patent documentation 1: TOHKEMY 2001-61268 communique
Patent documentation 2: TOHKEMY 2003-21857 communique
Summary of the invention
The problem to be solved in the present invention
Disclosed stepping motor additionally comprises the magnetic part that is used for applying to rotor latching force in the above-mentioned patent documentation 1.In addition, the employed motor of disclosed shutter forms by the mode that the feasible magnetic pole of facing the stator of magnet outer peripheral face is formed the pectination shape with complexity in the above-mentioned patent documentation 2.Therefore, the motor of describing in the above-mentioned routine techniques additionally comprises new parts or the complicated processing of needs, has caused problem complicated such as electric machine structure and that manufacturing cost increases.
The invention solves above problem, and the purpose of this invention is to provide the stepping motor that the simple structure of a kind of usefulness just can obtain necessary brake torque.The present invention aims to provide the driving mechanism of the video camera with above-mentioned stepping motor.
The means of dealing with problems
According to a further aspect in the invention, provide a kind of stepping motor, having comprised: rotor with four magnetic poles; First magnetic pole of first coil magnetization; Second magnetic pole of second coil magnetization; And the 3rd magnetic pole of first coil and second coil magnetization.The 3rd magnetic pole and gap between rotor D be greater than first magnetic pole and gap between rotor d and second magnetic pole and gap between rotor d, makes producing magnetic pull between the magnetic pole of rotor and first magnetic pole and between another magnetic pole of rotor and second magnetic pole.
According to the present invention, producing powerful magnetic pull (magnetic coupling force) between first magnetic pole and the rotor and between second magnetic pole and the rotor, make can not obtain enough brake torques during flowing through coil when electric current.Owing to be arranged on two magnetic poles on the stator and two groups of magnetic pull between epitrochanterian two magnetic poles, so this brake torque has big value.Therefore, this stepping motor is applied to the fast door drive mechanism of video camera, when electric current flows, also can keeps the shutter state reliably.This stepping motor with simple structure can suppress power consumption reliably, makes it can be as low-cost and energy-conservation stepping motor.
Above-mentioned rotor can have cylindrical shape; Plane graph is that the stator of substantial transverse U-shaped is arranged to the outer peripheral face towards rotor; First magnetic pole and second magnetic pole are positioned at the two ends of stator; And the 3rd magnetic pole is positioned at the central authorities of stator.In addition, preferably, in above-mentioned stepping motor, first coil is between first magnetic pole and the 3rd magnetic pole, and second coil is between second magnetic pole and the 3rd magnetic pole; Stator comprises the teat of the displacement that is used to prevent first coil and second coil.By this structure, first coil and second coil can be positioned given position reliably.
According to a further aspect in the invention, preferably, provide a kind of camera driver mechanism, having comprised: above-mentioned stepping motor; The engagement pin (engagement pin) that is connected with the rotor of stepping motor and in given range, carries out rotational motion; And fan portion (sector), have the connecting hole that engages with engagement pin, and closing the shooting that is formed in the substrate with the position of opening and open between the another location of this shooting with opening and move according to the rotational motion of engagement pin.This driving mechanism comprises the stepping motor that can produce above-mentioned powerful brake torque, even also fan portion can be remained on the state of hope when making no power.
This fan portion can comprise shutter disk and diaphragm sheet.By as required these sheets being made up, can with opening full-gear, full-shut position and small-bore state be set to the shooting that is arranged on the shutter substrate.In addition, when not having electric current to flow, can keep the shutter state.
The effect of invention
According to the present invention, between first magnetic pole on the stator and second magnetic pole and rotor, produce powerful magnetic pull, making to provide the stepping motor that can produce enough brake torques when not having the electric current flowing through coil to rotor.This stepping motor has simple structure and can suppress power consumption reliably, and can be used as low-cost and energy-conservation stepping motor.
Embodiment
Provide explanation hereinafter with reference to accompanying drawing to the embodiment of the invention.Fig. 1 is the figure that illustrates according to the main building block of the stepping motor of the embodiment of the invention.Stepping motor 1 comprises rotor 2 and stator 3, and rotor 2 is provided with in the central and can rotates along both direction, and stator 3 is set to towards the periphery of rotor 2.Rotor 2 has circular cross section and has cylindrical shape.Stator 3 is integrally formed as the cross section with substantial transverse U-shaped, and is in rotor 2 is contained in state in its inner space.In addition, by the state that the open end of the horizontal U-shaped of stator 3 makes progress stepping motor 1 is shown at Fig. 1.
Between first magnetic pole 11 and the 3rd magnetic pole 13, be wound with first coil 4, between second magnetic pole 12 and the 3rd magnetic pole 13, be wound with second coil 5.When 4 energisings of first coil, first magnetic pole 11 is by excitation, and when 5 energisings of second coil, second magnetic pole 12 is by excitation.On the contrary, the 3rd magnetic pole 13 is by first coil 4 and second coil, 5 the two excitation.Therefore, the excited state of the 3rd magnetic pole 13 shows as the combination of the "on" position of first coil 4 and second coil 5.
Fig. 1 is shown in broken lines is connected to first coil 4 of stepping motor 1 and the current control circuit 25 of second coil 5.According to present embodiment, current control unit 25 provides electric current so that first coil 4 and second coil 5 are carried out excitation.This electric current that provides comprises two kinds of patterns of setting.In first pattern, provide electric current so that the two carries out excitation to first coil 4 and second coil 5 from current control circuit 25, and always control driving condition rotor 2 by changing electric current provider in each coil.In first pattern, have two states: a kind of state is that first magnetic pole 11 is to have identical magnetic polarity with second magnetic pole 12 by excitation, and another kind of state is that first magnetic pole 11 and second magnetic pole 12 are to have dissimilar magnetic polarities respectively by excitation.At this moment, if first magnetic pole 11 is to have identical magnetic polarity with second magnetic pole 12 by excitation, this causes the 3rd magnetic pole 13 to set up the magnetic field stronger than the magnetic field of above-mentioned magnetic pole.On the contrary, if first magnetic pole 11 and second magnetic pole 12 by excitation for to have different magnetic polarities respectively, then the magnetization in the 3rd magnetic pole 13 is cancelled each other, causing does not have magnetized state.
In second pattern, provide electric current carrying out excitation to one first coil 4 and second coil 5 from current control circuit 25, and always control driving condition rotor 2 by changing the electric current provider.In second pattern, only carry out excitation, and always it is switched to opposite magnetic polarity by changing the electric current provider to one in first magnetic pole 11 and second magnetic pole 12.In second pattern, the 3rd magnetic pole 13 by excitation be have with by the opposite polarity polarity of first magnetic pole 11 of excitation or second magnetic pole 12.
In first pattern, control driving to rotor 2 by the two-phase excitation state that wherein first coil 4 and second coil 5 is carried out excitation.On the other hand, in second pattern, by wherein only to one in first coil 4 and second coil 5 carry out excitation one mutually excited state control driving to rotor 2.Provide detailed description after a while with reference to the accompanying drawings to the rotary state of rotor 2 in first pattern and second pattern.
In addition, stepping motor 1 comprises the rotor 2 with four magnetic poles, and is constituted as the enough brake torques of acquisition not to first coil 4 and 5 energisings of second coil time.To describe this point.In stepping motor 1, the spacing between the side face of rotor 2 and first magnetic pole 11 is set to gap d, and the side face of rotor 2 and the spacing between second magnetic pole 12 also are set to gap d.Be provided with gap d very narrow so that can obtain with rotor 2 on enough magnetic pull of magnetic pole.On the contrary, clearance D is the side face of rotor 2 and the spacing between the 3rd magnetic pole 13, and is set to larger than gap d.Clearance D is set to have the sufficient distance of the magnetic pull of generation between the magnetic pull that makes between the 3rd magnetic pole 13 and the rotor 2 magnetic pull that produces not influence to produce between first magnetic pole 11 and the rotor 2 and second magnetic pole 12 and the rotor 2.For example, clearance D is set to about 1.3 double-lengths of gap d.
According to above-mentioned structure, realized that first magnetic pole 11 and second magnetic pole 12 attract two magnetic poles on the rotor 2 respectively consumingly and the 3rd magnetic pole 13 does not disturb this magnetic relation.Therefore, when not switching on, as illustrated in Fig. 1, two magnetic poles on the rotor 2 are stabilized in exactly the position towards first magnetic pole 11 and second magnetic pole 12 respectively.In stepping motor 1, two positions (two groups) of existence mutual magnetic attachment when not switching on make to obtain very strong brake torque.Therefore, stepping motor 1 when not switching on can with rotor stability remain on given position, and for example be applicable to the fast door drive mechanism of video camera, shutter etc. is stably remained on the state of hope.
Below, provide explanation with reference to Fig. 2 to Fig. 4 to the rotation of the rotor in the stepping motor 12.Fig. 2 illustrates above-mentioned first electric current and supplies a pattern, and by the two-phase excitation state that first coil 4 and second coil 5 is carried out excitation rotor 2 is rotated.Fig. 3 and Fig. 4 illustrate above-mentioned second pattern, and by only to one in first coil 4 or second coil 5 a phase excited state that carries out excitation rotor 2 being rotated.Particularly, Fig. 3 illustrates the situation of first coil 4 being carried out excitation, and Fig. 4 illustrates the situation of first coil 5 being carried out excitation.By current control circuit shown in Figure 1 25 electric current is offered Fig. 2 to each coil 4 and 5 shown in Figure 4, but at these not shown current control circuits 25.In addition, for the ease of understanding, Fig. 3 and Fig. 4 only illustrate the coil of energising.
With reference to Fig. 2, provide the explanation how rotor 2 to stepping motor 1 rotates.Fig. 2 illustrates above-mentioned first pattern, illustrate to first coil 4 and second coil 5 carry out excitation so that rotor 2 by 45 ° step angle (along right-hand lay) situation of rotating along clockwise direction.The state that coil 4 and 5 is not switched on has been shown in Fig. 2 (a).To Fig. 2 (e), show the situation that the electric current that offers coil 4 and 5 is controlled and rotor 2 is rotated along clockwise direction at Fig. 2 (b) by the seasonal effect in time series mode.In Fig. 2 (a), as mentioned above, coil 4 and 5 is not switched on, and first magnetic pole 11 and second magnetic pole 12 be not by excitation, yet owing to very strong brake torque, the N magnetic pole of rotor 2 and S magnetic pole remain on respectively towards the position of first magnetic pole 11 and second magnetic pole 12.
In Fig. 2 (b), from the state shown in Fig. 2 (a), to first coil 4 and the energising of second coil 5, and first magnetic pole 11 and second magnetic pole 12 are the S utmost point by excitation all.At this moment, N utmost point excitation with interest in the 3rd magnetic pole 13.Then, in Fig. 2 (c), from the state shown in Fig. 2 (b), the excited state of first magnetic pole 11 remains the S utmost point, and second magnetic pole 12 is the opposite N utmost point by excitation.At this moment, excitation is the N utmost point and the S utmost point and cancels each other, causes the 3rd magnetic pole 13 to be in no magnetized state.In an identical manner, in Fig. 2 (d), from the state shown in Fig. 2 (c), first magnetic pole 11 and second magnetic pole 12 are the N utmost point by excitation all.At this moment, S utmost point excitation with interest in the 3rd magnetic pole 13.Then, in Fig. 2 (e), from the state shown in Fig. 2 (d), the excited state in first magnetic pole 11 remains the N utmost point, and second magnetic pole 12 is the opposite S utmost point by excitation.At this moment, excitation is the N utmost point and the S utmost point and cancels each other, causes the 3rd magnetic pole 13 to be in no magnetized state.
As mentioned above, along with the magnetized state of the magnetic pole in the stator 3 11 to 13 gradually changes, rotor 2 rotates by 45 ° stepping as shown in figure along clockwise direction.Here, respectively illustrating among Fig. 2 is positioned at the position of having finished 45 ° of rotations to first coil 4 and the energising of second coil 5 and rotor 2.In Fig. 2, be noted that especially Fig. 2 (a) illustrates not "on" position.In stepping motor 1, between first magnetic pole 11 and the rotor 2 and the gap d between second magnetic pole 12 and the rotor 2 be formed very narrowly, producing powerful magnetic pull respectively between first magnetic pole 11 and the rotor 2 and between second magnetic pole 12 and the rotor 2 thus.Therefore, even making, brake torque can not keep the state shown in Fig. 2 (a) reliably when switching on yet.
In addition, in the state shown in Fig. 2 (c) and Fig. 2 (e), first magnetic pole 11 and second magnetic pole 12 are by excitation, and two magnetic fields on the rotor 2 are respectively exactly towards first magnetic pole 11 and second magnetic pole 12.Even blocking-up is to the energising of coil 4 and 5, the situation shown in Fig. 2 (a) is the same, also can keep above-mentioned state by brake torque.Here, the position of the rotor 2 of Fig. 2 (e) is identical with the position shown in Fig. 2 (a).Therefore, when blocking-up was to the energising of coil 4 and 5 in the state shown in Fig. 2 (e), state became the state shown in Fig. 2 (a).
Fig. 3 illustrates the situation that above-mentioned second electric current supplies a pattern, and also illustrates by a phase excited state only first coil 4 to be carried out excitation so that rotor 2 (along right-hand lay) situation of rotating by 90 ° step angle along clockwise direction.The state that coil 4 and 5 is not switched on has been shown in Fig. 3 (a)., to Fig. 3 (e), show in the seasonal effect in time series mode electric current that offers coil 4 is controlled so that the situation that rotor 2 rotates by 90 ° stepping along clockwise direction at Fig. 3 (b).In Fig. 3, oppositely make the polarity inversion of first magnetic pole 11 by making the sense of current that offers first coil 4.At this moment, the polarity of the 3rd magnetic pole 13 is opposite with first magnetic pole.In addition, second magnetic pole 12 is not subjected to coil magnetization, has the polarity identical with the polarity of the 3rd magnetic pole 13.
At first, in Fig. 3 (a), first magnetic pole 11 and second magnetic pole 12 be by excitation, and identical with shown in Fig. 2 (a) is set to towards first magnetic pole 11 and second magnetic pole 12 the N utmost point of rotor 2 and the S utmost point respectively by powerful brake torque.Then, in Fig. 3 (b), from the state of Fig. 3 (a) first coil 4 is switched on, first magnetic pole 11 is the S utmost point by excitation.At this moment, the 3rd magnetic pole 13 and second magnetic pole are the N utmost point by excitation.In Fig. 3 that illustrates subsequently (c), from the state shown in Fig. 3 (b), the excited state of first magnetic pole 11 is changed into the N utmost point, and the 3rd magnetic pole 13 and second magnetic pole 12 are the opposite S utmost point by excitation.In an identical manner, in Fig. 3 (d), from the state shown in Fig. 3 (c), first magnetic pole 11 is the S utmost point by excitation.At this moment, the 3rd magnetic pole 13 and second magnetic pole 12 are the N utmost point by excitation.Then, in Fig. 3 (e), from the state shown in Fig. 3 (d), first magnetic pole 11 becomes the N utmost point, and the 3rd magnetic pole 13 and second magnetic pole 12 are the opposite S utmost point by excitation.
As mentioned above, along with the magnetized state of the magnetic pole in the stator 3 11 to 13 gradually changes, rotor 2 rotates by 90 ° stepping as shown in figure along clockwise direction.Here, respectively illustrating among Fig. 3 is positioned at the position of having finished 90 ° of rotations to 4 energisings of first coil and rotor 2.In a phase excited state shown in Figure 3, to all states shown in Fig. 3 (e), two magnetic fields on the rotor 2 are respectively exactly towards first magnetic pole 11 and second magnetic pole 12 at Fig. 3 (a).Therefore, even blocking-up is to the energising of coil 4 to Fig. 3 (e) at Fig. 3 (b), identical with shown in Fig. 3 (a) also can keep above-mentioned state by brake torque.Here, the example shown in Fig. 3 has been showed a significant advantage: be under the situation of halted state at second coil 5, rotor 2 can rotate by 90 ° stepping along clockwise direction.
In addition, Fig. 4 illustrates the situation that above-mentioned second electric current supplies a pattern, and also illustrates by a phase excited state only second coil 5 to be carried out excitation so that the situation that rotor 2 rotates by 90 ° step angle in the counterclockwise direction.Fig. 4 illustrates just in time opposite with the action among Fig. 3 action.In addition, in Fig. 4, along with the magnetized state of the magnetic pole in the stator 3 11 to 13 gradually changes, rotor 2 rotates by 90 ° stepping as shown in figure in the counterclockwise direction.In addition, equally as shown in Figure 4, in all states that Fig. 4 (a) illustrates to Fig. 4 (e), two magnetic fields on the rotor 2 are respectively exactly towards first magnetic pole 11 and second magnetic pole 12.Therefore, even blocking-up also can keep above-mentioned state by brake torque to the energising of coil 5.
As mentioned above, based between first magnetic pole 11 and the rotor 2 and the structure that between second magnetic pole 12 and rotor 2, produces powerful magnetic pull respectively, even stepping motor 1 has the structure that also can obtain very strong brake torque when coil 4 and 5 no powers.In addition, as mentioned above, step angle is set under 45 ° the situation in the two-phase excitation state, and perhaps step angle is set to can obtain brake torque in the same way under 90 ° the situation in a phase excited state.
Fig. 5 is the figure that the stator with the preferable shape that is applicable to stepping motor 1 is shown.In Fig. 5, parts and the structure identical with structure with the parts of Fig. 1 and Fig. 2 have identical label.First magnetic pole 11 of stator 3 and second magnetic pole 12 are constructed to the side face in the face of unshowned rotor, and it is long with the shape corresponding to the longer sides of rotor to be formed vertical limit.Stator 3 has arm 31 and 32 in both sides, and arm 31 and 32 is connected to base portion 35.The 3rd magnetic pole 13 is formed on the central authorities of base portion 35.The 3rd magnetic pole 13 also is formed the elongate shape identical with second magnetic pole 12 with first magnetic pole 11.
Stator 3 comprises arm 31 and 32, is used for the coil 4 and 5 that first to the 3rd magnetic pole carries out excitation reeling arm 31 and 32.For set winding 4 and 5, be provided with teat 33 and 34 in the rear end of each arm.So the teat 33 and 34 that is provided with can realize making the structure that the coil 4 and 5 of arm 31 and 32 locatees reliably of reeling respectively.In addition, be formed with recess 37 to 39 on the top of magnetic pole 11 to 13.Stepping motor 1 according to present embodiment is incorporated in the module with last lower casing (case).Recess 37 to 39 is used for the shell that will be provided with is positioned.
Fig. 6 is the perspective view that the outward appearance of stepping motor 1 is shown, and its critical piece merges in the module.In addition, in Fig. 6, parts and the structure identical with structure with the parts of Fig. 1 and Fig. 2 have identical label.Fig. 6 illustrates the module that upper casing 7 and lower casing 8 are set together from top and bottom and critical piece.When this stepping motor module was used for the fast door drive mechanism of video camera, brake torque very strong when no power worked.So, shutter stably can be remained on given state.This has eliminated can provide the stepping motor with energy-conservation purpose to coil electricity to keep the necessity of shutter state, to make.In addition, this stepping motor has and between the magnetic pole of its rotor and stator the vicissitudinous simple structure of spacing is set, and makes and can realize stepping motor with low cost.
In addition, with reference to Fig. 7 to Figure 10, the example that above-mentioned stepping motor 1 is used for the driving mechanism of shutter drive division is described.Fig. 7 (A) is the schematically illustrated figure that is arranged on the plane graph of the stepping motor 1 in the shutter substrate 50.Shutter substrate 50 comprises the lens openings 51 of the usefulness of making a video recording, and below will describe.Be provided with three fan portions 60,65 and 70 in the front face side of shutter substrate 50 along the surface of substrate 50.These fan portions are first shutter disk 60, second shutter disk 65 and diaphragm sheet 70 from shutter substrate 50 sides order.Stepping motor 1 is arranged on the rear side of shutter substrate 50.
In Fig. 7 (A), can not determine the position in hole, and first shutter disk 60 have be arranged on substrate 50 on the hole that engages of projection 61 and with another hole that engages from rotor 2 extended engagement pins 27.In an identical manner, second shutter disk 65 have be arranged on substrate 50 on the hole that engages of projection 66 and with another hole that engages from rotor 2 extended engagement pins 27.In addition, diaphragm sheet 70 have be arranged on substrate on the hole that engages of projection 71 and with another hole that engages from rotor 2 extended engagement pins 27.To illustrate that after a while above-mentioned first shutter disk 60, second shutter disk 65 and diaphragm sheet 70 are swung according to the rotational motion of engagement pin 27, retouch out its oneself track simultaneously respectively.Fig. 8 to Figure 10 illustrates position and the action thereof that is arranged on the hole on sheet 60,65 and 70.
The arm 26 that extends along radial direction is connected to the rotor 2 in the stepping motor 1 that is arranged on substrate 50 rear side.Engagement pin 27 links to each other with an end of arm 26, and passes the opening 55 that is arranged in the shutter substrate 50 and extend to opposition side.The engagement pin 27 of side upper process engages with hole on being separately positioned on first shutter disk 60, second shutter disk 65 and diaphragm sheet 70 in front.Therefore, when the rotor in the stepping motor 12 rotated, engagement pin 27 rotated in linkage with its motion, and first shutter disk 60, second shutter disk 65 and diaphragm sheet 70 are by given track swing.
Fig. 7 (B) is the figure that the movement locus CR of engagement pin 27 is shown.Engagement pin 27 can rotate on 360 ° of ground according to the rotation of rotor 2, but the opening 55 that is formed in the substrate 50 is fan-shaped, and is provided with the parts 29 of the motion that is used for regulation arm 26.Therefore, in the present embodiment, engagement pin 27 is constructed to rotate in given range RE.Scope RE is set to for example have about 120 ° central angle.
With reference to Fig. 8 to Figure 10 the fast door drive mechanism with above-mentioned structure is described.These figure show the situation of the change in location of first shutter disk 60, second shutter disk 65 and the diaphragm sheet 70 seen from the front face side of shutter substrate 50 separately.Stepping motor 1 is shown to determine the rotary state of rotor 2 on the top of each figure.
Fig. 8 illustrates the full-gear of the lens openings 51 of the shooting usefulness that is arranged in the substrate 50.Symbol CR shown in Figure 8 is corresponding to the symbol CR shown in Fig. 7 (B).At this moment, the angle of rotation of the rotor 2 of stepping motor 1 is 0 °, and for example makes it stop at the position of comparing position shown in more close slightly Fig. 2 (b) with position shown in Fig. 2 (a) by regutation part 29.The N magnetic pole of rotor 2 and S magnetic pole remain it because braking moment and to moving in the face of the position of first magnetic pole 11 and second magnetic pole 12 but be subjected to the state of the regulation of regutation part 29.Therefore, even in state shown in Figure 8, can not keep this shutter state to coil 4 and 5 energisings yet.Even also can keep the shutter state reliably to apply slight collision to video camera based on the state confining force of brake torque is powerful.Here, Fig. 8 the hole 62 that engages with projection 61 that is arranged on first shutter disk 60 is shown, be arranged on second shutter disk 65 with the chimeric hole 67 of projection 66 and be arranged on the hole 72 that engages with projection 71 on the diaphragm sheet 70.As the hole that engages with engagement pin 27, connecting hole 73 can be determined on the nearside in diaphragm sheet 70.
In the position that the rotor 2 of the stepping motor 1 shown in the top of Fig. 8 (is approximately 25 ° according to the present invention) along clockwise direction a little and departs from the rotor 2 of the no power state shown in Fig. 2 (a).In driving mechanism, engagement pin 27 is set to set up this position deviation with the position relation of regutation part 29 (with reference to Fig. 7 (B)).By this structure, each magnetic pole on the rotor 2 always tries hard to move to the position in the face of first magnetic pole 11 and second magnetic pole 12, makes always can produce brake torque.Therefore, by this brake torque, each sheet 60,65 and 70 stably can be remained on given position.
Fig. 9 illustrates the full-shut position of the lens openings 51 of the shooting usefulness that is arranged in the substrate 50.Fig. 9 illustrates rotor 2 and rotates about 65 ° state along clockwise direction from state shown in Figure 8, and engagement pin 27 rotates in linkage with it.First shutter disk 60, second shutter disk 65 and diaphragm sheet 70 are swung according to the rotational motion of engagement pin 27, retouch out its track separately simultaneously respectively.So lens openings 51 is covered by first shutter disk 60 and second shutter disk 65.At this moment, the rotor 2 of stepping motor 1 rotates along clockwise direction, for example corresponding to the state of Fig. 2 (c).In Fig. 9, the N magnetic pole of rotor 2 and S magnetic pole are remained on respectively accurately position in the face of first magnetic pole 11 and second magnetic pole 12 respectively by brake torque.Therefore, even the energising of blocking coil 4 and 5 in state shown in Figure 9 also can remain on shutter this closed condition.Also can keep the shutter state reliably even this state confining force is powerful to apply slight collision to video camera.
Figure 10 is the figure that the small-bore state is shown, and wherein the diaphragm sheet is arranged in the lens openings 51 that is arranged on substrate 50 shooting usefulness.In Figure 10, rotor 2 further rotates along clockwise direction from state shown in Figure 9, and has switched on twice shown in Fig. 2 (e) afterwards at Fig. 2 (d).Engagement pin 27 rotates in linkage with it.First shutter disk 60, second shutter disk 65 and diaphragm sheet 70 are swung according to the rotational motion of engagement pin 27, and their tracks separately simultaneously draw respectively.So first shutter disk 60 and second shutter disk 65 move away to the position of opening lens openings 51, on the contrary, diaphragm sheet 70 arrives closes the position of lens openings 51.Diaphragm sheet 70 is equipped with diaphragm opening 75, makes lens openings 51 can realize the small-bore state.At this moment, the rotor 2 of stepping motor 1 rotates along clockwise direction, for example makes it stop at the position of comparing position shown in more close slightly Fig. 2 (d) with position shown in Fig. 2 (e) by regutation part 29.In Figure 10, identical with situation shown in Figure 8, depart from the counterclockwise direction a little the position of the rotor 2 under the no power state.Equally, under state shown in Figure 10, even blocking-up to the energising of coil 4 and 5, the position that also can keep each sheet makes it possible to keep the small-bore.Can shown in Fig. 2 (c), switch on once, to return state shown in Figure 9 from state shown in Figure 10.Can shown in Fig. 2 (c), switch on once, to move to state shown in Figure 9 from Fig. 8 or state shown in Figure 10.Yet, can shown in Fig. 2 (a), switch on twice afterwards at Fig. 2 (b), to move to state shown in Figure 8 from state shown in Figure 9.As mentioned above, can shown in Fig. 2 (e), switch on twice afterwards at Fig. 2 (d), to move to state shown in Figure 10 from state shown in Figure 9.
As mentioned above, even use the fast door drive mechanism no power of above-mentioned stepping motor 1 also can keep as Fig. 8 to full-gear, full-shut position and small-bore state shown in Figure 10.This makes to provide has realized energy-conservation mechanism.Aforesaid fast door drive mechanism illustration drive the stepping motor of two shutter disks and a diaphragm sheet, yet be not limited to present embodiment, the quantity of the quantity of shutter disk and diaphragm sheet can change as required.
The invention is not restricted to the foregoing description, can under the situation that does not break away from the scope of the invention as claimed in claim, make other embodiment, variants and modifications.
Description of drawings
Fig. 1 is the figure that illustrates according to the main building block of the stepping motor of embodiment;
Fig. 2 is the figure that the situation that the rotor according to the stepping motor of embodiment rotates under the two-phase excitation state is shown;
Fig. 3 is the figure that illustrates according to the rotor situation that clockwise direction rotates under a phase excited state of the stepping motor of embodiment;
Fig. 4 is the figure that the situation that the rotor according to the stepping motor of embodiment counterclockwise rotates under a phase excited state is shown;
Fig. 5 is the figure that the stator with the preferable shape that is applicable to stepping motor is shown;
Fig. 6 is the perspective view of outward appearance that the module of the structure with stepping motor is shown;
Fig. 7 (A) is the schematically illustrated figure that is arranged in the plan view of the stepping motor in the shutter substrate; Fig. 7 (B) is the figure that the movement locus of engagement pin is shown;
Fig. 8 is the figure that the full-gear of the imaging lens opening that is arranged in the substrate is shown;
Fig. 9 is the figure that the full-shut position of the imaging lens opening that is arranged in the substrate is shown; And
Figure 10 is the figure that the small-bore state of the imaging lens opening that is arranged in the substrate is shown.
Claims (5)
1, a kind of stepping motor is characterized in that comprising: the rotor with four magnetic poles; First magnetic pole by first coil magnetization; Second magnetic pole by second coil magnetization; And by the 3rd magnetic pole of first coil and second coil magnetization;
Wherein the 3rd magnetic pole and gap between rotor D be greater than first magnetic pole and gap between rotor d and second magnetic pole and gap between rotor d, thereby producing magnetic pull between the utmost point of rotor and first magnetic pole and between another utmost point of rotor and second magnetic pole.
2, stepping motor according to claim 1, it is characterized in that: rotor has cylindrical shape; Plane graph is that the stator of substantial transverse U-shaped is set to the outer peripheral face in the face of rotor; First magnetic pole and second magnetic pole are set at the two ends of stator; And the 3rd magnetic pole is set at the central authorities of stator.
3, stepping motor according to claim 2 is characterized in that: first coil is set between first magnetic pole and the 3rd magnetic pole, and second coil is set between second magnetic pole and the 3rd magnetic pole; And stator comprises the teat of the displacement that is used to prevent first coil and second coil.
4, a kind of camera driver mechanism is characterized in that comprising: as each described stepping motor of claim 1 to 3;
Engagement pin is connected with the rotor of stepping motor and carries out rotational motion in given range; And
Fan portion has the connecting hole that engages with engagement pin, and is closing the shooting that is formed in the substrate with the position of opening and open between the another location of this shooting with opening and move according to the rotational motion of engagement pin.
5, camera driver according to claim 4 mechanism is characterized in that fan portion comprises shutter disk and diaphragm sheet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003188981A JP4271514B2 (en) | 2003-06-30 | 2003-06-30 | Step motor |
| JP188981/2003 | 2003-06-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1816960A true CN1816960A (en) | 2006-08-09 |
| CN100495871C CN100495871C (en) | 2009-06-03 |
Family
ID=33549770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200480018739XA Expired - Fee Related CN100495871C (en) | 2003-06-30 | 2004-06-28 | Step motor |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP4271514B2 (en) |
| KR (1) | KR100745729B1 (en) |
| CN (1) | CN100495871C (en) |
| WO (1) | WO2005002029A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110226123A (en) * | 2017-01-25 | 2019-09-10 | 日本电产科宝株式会社 | Blade driving apparatus and capture apparatus and actuator with the blade driving apparatus |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007233053A (en) * | 2006-03-01 | 2007-09-13 | Canon Electronics Inc | Light quantity controller and optical imaging device |
| CN112243563A (en) | 2018-06-26 | 2021-01-19 | 三美电机株式会社 | Rotary reciprocating drive actuator |
| JP7140980B2 (en) | 2019-12-13 | 2022-09-22 | ミツミ電機株式会社 | rotary reciprocating drive actuator |
Family Cites Families (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 (en) * | 1982-10-29 | 1984-05-09 | Rhythm Watch Co Ltd | Small motor for timepiece |
| JP2001033844A (en) * | 1999-07-15 | 2001-02-09 | Olympus Optical Co Ltd | Exposure adjusting device and electronic camera using the same |
-
2003
- 2003-06-30 JP JP2003188981A patent/JP4271514B2/en not_active Expired - Fee Related
-
2004
- 2004-06-28 WO PCT/JP2004/009099 patent/WO2005002029A1/en active Application Filing
- 2004-06-28 KR KR1020057024419A patent/KR100745729B1/en not_active IP Right Cessation
- 2004-06-28 CN CNB200480018739XA patent/CN100495871C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110226123A (en) * | 2017-01-25 | 2019-09-10 | 日本电产科宝株式会社 | Blade driving apparatus and capture apparatus and actuator with the blade driving apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005002029A1 (en) | 2005-01-06 |
| CN100495871C (en) | 2009-06-03 |
| KR100745729B1 (en) | 2007-08-02 |
| JP4271514B2 (en) | 2009-06-03 |
| JP2005027408A (en) | 2005-01-27 |
| KR20060024430A (en) | 2006-03-16 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180706 Address after: Chiba County, Japan Patentee after: Seiko Instruments Inc. Address before: Chiba County, Japan Patentee before: Seiko Precision Inc. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090603 |