CN103123432A - Shooting device - Google Patents

Shooting device Download PDF

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Publication number
CN103123432A
CN103123432A CN2012104181914A CN201210418191A CN103123432A CN 103123432 A CN103123432 A CN 103123432A CN 2012104181914 A CN2012104181914 A CN 2012104181914A CN 201210418191 A CN201210418191 A CN 201210418191A CN 103123432 A CN103123432 A CN 103123432A
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CN
China
Prior art keywords
frame
group
lens
focusing
optical axis
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Granted
Application number
CN2012104181914A
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Chinese (zh)
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CN103123432B (en
Inventor
安富晓
山宫国雄
藤井尚树
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Aozhixin Digital Technology Co ltd
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Olympus Imaging Corp
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Publication of CN103123432A publication Critical patent/CN103123432A/en
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Publication of CN103123432B publication Critical patent/CN103123432B/en
Expired - Fee Related legal-status Critical Current
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  • Adjustment Of Camera Lenses (AREA)

Abstract

The present invention provides a shooting device. The shooting device enables an electromagnetic type linear motor and a film-judder correcting device not to interfere with each other, is thinned when being shrunk, and comprises a lens cone (1), a shooting element (110), and the film-judder correcting device (105). The lens cone (1) retains a shooting lens system, and the shooting lens system is composed of a plurality of lenses, including a focusing lens (24). The shooting element (110) receives an optical image formed by the shooting lens system to generate the image data, and the film-judder correcting device (105) enables the shooting element (110) to move in a plane parallel with the illuminated face of the shooting element to carry out film-judder correction. The shooting device is characterized in that the lens cone (1) comprises the electromagnetic type linear motor (18), the electromagnetic type linear motor (18) is a focusing driving unit for driving the focusing lens (24) to advance and retreat along an optical axis, and a part of the electromagnetic type linear motor (18) enters the film-judder correcting device (105), so that the electromagnetic type linear motor and the film-judder correcting device do not interfere with each other.

Description

Camera head
Technical field
The present invention relates to the camera heads such as Electrofax.
Background technology
In recent years, the camera head of taking subject with imaging apparatuss such as CCD and cmos sensors is extensively universal.In these camera heads, the camera head that adopts following structure is known: in order to drive movable camera lens frame, particularly to keep the camera lens frame of focus lens to advance and retreat on optical axis direction, use motor, by the screw mandrel of direct motor drive rotation and the nut part that engages with this screw mandrel, make the movement of advancing and retreat of movable camera lens frame together with nut part, perhaps drive by VCM and make movable camera lens frame advance and retreat mobile (for example, with reference to patent documentation 1 and 2).
For example, put down in writing the camera head with the lens barrel that is equipped with the bending image pickup optical system in patent documentation 1.In this camera head, in the lens combination of 5 groups of structures second group, the 4th group and the 5th group of lens are moving lenss.The 5th group of lens of wherein, focusing are by the five group lens frame support integrally formed with sleeve.Sleeve has interior threaded part, and interior threaded part engages with the screw mandrel that rotates by the motor that is configured in the imaging apparatus side and extend on optical axis direction, and the leading axle that extends on optical axis direction runs through sleeve slidably.Thus, by making the motor rotation, drive the 5th group of lens and advance and retreat on optical axis direction.
And according to patent documentation 2, camera head is the camera head that moving lens is moved by actuators such as voice coil motors on optical axis direction.In this camera head, focusing base component 6 fixing (combination) is on shooting base plate 9.And, be fixed with yoke 61,62 and magnet 63 on base component 6 in focusing.Be fixed with the hollow core portion of coil 41 of the hollow coil 41 with angle barrel shape towards the optical axis direction opening on the 4th holding frame 4.
[patent documentation 1] TOHKEMY 2009-133944 communique
[patent documentation 2] TOHKEMY 2010-72061 communique
In addition, many digital cameras have the picture blurring compensation device of the flating that the motion etc. of the hand when proofreading and correct because of photography causes.As the picture method of compensating for hand shake, known have optical profile type that the dollying element proofreaies and correct as jitter correction.In order to carry out the picture jitter correction of this optical profile type, be provided with the picture blurring compensation device for the dollying element, imaging apparatus is placed on this as on blurring compensation device.
Yet, because the focusing driver element that drives focus lens and this are interfered as blurring compensation device, thereby become the restriction of the miniaturization of camera head.For example, in the camera head of patent documentation 1, the screw mandrel of focusing driver element is side-prominent to imaging apparatus with the motor that is configured in its underpart.Therefore, in the situation that be provided with the picture blurring compensation device, when observing on optical axis direction, must be at the outside of imaging apparatus configuration motor, so that motor and not interfering as blurring compensation device causes lens barrel to increase.
And in the camera head of patent documentation 2 records, fixed configurations clips the telescopic lens barrel of base component and picture blurring compensation device.And the motor of focusing use and leading axle are avoided the position as the blurring compensation device interference with rear side, are fixed on the peripheral part of the fixed frame of lens barrel.In this structure, can not reduce the bore of lens barrel.And, because the peripheral part at fixed frame is provided with motor and leading axle, thereby in the time will configuring again flashlamp and tripod etc., in order to ensure configurable space, device is further maximized, exist in this respect and improve leeway.
Summary of the invention
Therefore, be conceived to this some and the object of the present invention is to provide of completing makes the focusing driver element and do not interfere and small-sized camera head as blurring compensation device.
The invention that the 1st technical scheme that achieves the above object relates to is a kind of camera head, it is characterized in that having: lens barrel, and it keeps the taking lens system that is made of a plurality of lens that comprise focus lens; Imaging apparatus, it receives through the formed optical image of described taking lens system and image data generating; And picture blurring compensation device, it makes described imaging apparatus look like the jitter correction action at the face internal shift parallel with the sensitive surface of this imaging apparatus, described lens barrel comprises the electromagnetic type linear electric motors, described electromagnetic type linear electric motors driving is described advances and retreat along optical axis to focus lens (also comprise swinging and use lens), the part of these electromagnetic type linear electric motors enters into this as in blurring compensation device, not interfere with described picture blurring compensation device.
In addition, here said " entering into " can be such configuration: " for example; be positioned at the rear foremost (as side) of picture blurring compensation device; in order to electromagnetic type linear electric motors on optical axis or the rearmost end of leading axle support portion are interfered; perhaps cross the recess that forms as the part of the movable part in blurring compensation device or movable part and fixed part as otch; both sides are opposed, in order to electromagnetic type linear electric motors on optical axis or the rearmost end of leading axle support portion are interfered ".
And " perforation " refers to have as blurring compensation device the opening that connects at optical axis direction, and the part of focusing driver element is in the state that is inserted at least in part in this opening.That is, the part of electromagnetic type linear electric motors need not necessarily to extend to the rear of picture blurring compensation device.
The invention that the 2nd technical scheme relates to is characterised in that, in the camera head of the 1st technical scheme record, the part of described electromagnetic type linear electric motors connects described picture blurring compensation device.
The invention that the 3rd technical scheme relates to is characterised in that, in the camera head of any one record, described have as blurring compensation device: base component is fixed with described lens barrel thereon in the 1st or the 2nd technical scheme; Sliding part, it is supported to and can move on the 1st direction vertical with described optical axis by this base component; And sensor holding frame, its by this sliding part support to can with the 2nd direction of described optical axis and described the 1st perpendicular direction on move, and support described imaging apparatus, observe from described optical axis direction, the part of described electromagnetic type linear electric motors connects the outside of the moving area of described sensor holding frame in the zone of described sliding part.
The invention that the 4th technical scheme relates to is characterised in that, in the camera head of any one record, the sectional area of main focusing leading axle is greater than the sectional area of pair focusing leading axle in the 1st or the 2nd technical scheme.
The invention that the 5th technical scheme relates to is characterised in that, observe described electromagnetic type linear electric motors from object side, the distance that the driving active line that the magnetic flux of drive coil and magnetic loop intersects and the distance between main focusing leading axle are focused between leading axle than described driving active line and pair is short.
According to the present invention, described lens barrel comprises focus lens and electromagnetic type linear electric motors, the electromagnetic type linear electric motors drive this focus lens are advanced and retreat along optical axis, the part of these electromagnetic type linear electric motors enters into this as in blurring compensation device, in order to do not interfere with described picture blurring compensation device, thereby can provide a kind of electromagnetic type linear electric motors and picture blurring compensation device of not making to interfere and slim camera head when shrinking.
Description of drawings
Fig. 1 is the exploded perspective view that the structure of wanting section of the image unit that comprises the lens barrel that consists of the camera head that an embodiment of the invention relate to and sensor unit is shown.
Fig. 2 is the cut-open view of the contraction state of image unit shown in Figure 1.
Fig. 3 is the cut-open view of the wide-angle position of image unit shown in Figure 1.
Fig. 4 is the cut-open view of the position of looking in the distance of image unit shown in Figure 1.
Fig. 5 is the cut-open view of the 4th group of lens of image unit shown in Figure 1, the 4th group of frame and focusing driver element.
Fig. 6 is the rear view of image unit shown in Figure 1.
Fig. 7 a is the rear view of the 4th group of lens of the image unit that relates to of modified example of the present invention, the 4th group of frame and electromagnetic type linear electric motors.
Fig. 7 b is the cut-open view of the 4th group of lens of the image unit that relates to of modified example of the present invention, the 4th group of frame and electromagnetic type linear electric motors.
Fig. 7 c is the 4th group of lens of the image unit that relates to of modified example of the present invention, the cut-open view of the 4th group of frame, focusing leading axle and secondary focusing leading axle.
Fig. 7 d is the cut-open view of the 4th group of lens of the image unit that relates to of modified example of the present invention, the 4th group of lens frame and electromagnetic type linear electric motors.
Fig. 7 e is the cut-open view of the 4th group of lens of the image unit that relates to of modified example of the present invention, the 4th group of lens frame, focusing leading axle and leading axle support portion.
Label declaration
1: lens barrel; 13: the four groups of frames; 13a: jut; 13b: sliding part; 18: electromagnetic type linear electric motors, focusing driver element; 18aa, 18ab, 18ac: permanent magnet; 18b: interior yoke; 18ca, 18cb, 18cc: outer yoke; 18cg: accessory; 18ch: the peristome of accessory; 18d: drive coil; 18f: main focusing leading axle; 18h: secondary focusing leading axle; The 19:LD main body; 19b: leading axle support portion; 105: as blurring compensation device; 119: the sensor holding frame.
Embodiment
Below, illustrate referring to the drawings the camera head that embodiments of the present invention relate to.
In addition, in description of the present embodiment, represent the optical axis (camera axis) of the photographic optical system in lens barrel with symbol O.On the direction (camera axis direction) of this optical axis O, as the place ahead, the direction with each members of frame in this lens barrel when the place ahead is made as stretches out direction with object side (object side).On the other hand, on the direction of optical axis O, as the rear, the direction with each members of frame when the rear is called the withdrawal direction with imaging side (as side).And the sense of rotation of each component parts in lens barrel uses the sense of rotation of observing from front side to represent.
The camera head of present embodiment is the retractable photographic optical system of use, is the device of lens barrel.this lens barrel constitutes has telescoping mechanism, described telescoping mechanism constitutes the total length that makes lens barrel can be at the free-extension between holding state (photographic state) and contraction state of photographing, and when being in photographic state, by a plurality of members of frame being stretched out between short focal position (wide-angle side) and long focal position (telescope end) or regaining and can carry out zoom and move (zoom), wherein said photography holding state is extend in elongation on the direction of optical axis O and towards the place ahead of the casing of camera head and give prominence to and the form that can photograph and move, even the use state of the form of photography action standby, described contraction state is shorten and be accommodated in the casing of camera head and the non-working condition of the form that lens barrel do not photographed move compared with the state along the elongation of the direction of optical axis O.
At first, the structure of lens barrel is described with reference to Fig. 1~Fig. 4.
Lens barrel 1 has: be fixed in the fixed frame 2 on the base component 101 of sensor unit 100; Cam frame 5, its frame 2 of being fixed support and are driven in rotation when zoom move or during contractive action, and on the direction of optical axis O by the advance and retreat driving; Floating drum wedge 6, it coexists with cam frame 5 one under the rotation restriction state and advances and retreat on the direction of optical axis O; Lead-frame 7, it coexists with cam frame 5 one under the rotation restriction state and advances and retreat on the direction of optical axis O; Under the rotation restriction state by the first group of frame 12 that is rotated in first group of lens 21 of maintenance of advancing and retreat on the direction of optical axis O of cam frame 5; Under the rotation restriction state by the second group of frame 11 that is rotated in second group of lens 22 of maintenance of advancing and retreat on the direction of optical axis O of cam frame 5; Keeping the 3rd group of frame 10 of the 3rd group of lens 23 and the shutter of support shutter/the 3rd group of unit 8, advances and retreat by being rotated on the direction of optical axis O of cam frame 5 under the rotation restriction state in described the 3rd group of frame 10 and the 3rd group of unit 8; And 13, the four groups of frames 13 of the 4th group of frame that keep the 4th group of lens (to focus lens) 24 are to be combined on fixed frame 2 in the mode that can advance and retreat on the direction of optical axis O.Here, first group of lens 21, second group of lens 22, the 3rd group of lens 23 and the 4th group of lens 24 consist of taking lens system.
Rotation when this lens barrel 1 moves between mobile terminal and mobile terminal, the place ahead in the wings by cam frame 5, carry out the location of contraction state and photographic state, under photographic state from the object side of optical axis O to first group of lens 21, second group of lens 22, the 3rd group of lens 23 and the 4th group of lens 24 are arranged successively as side, and the allocation of the cam frame 5 by mobile terminal, the place ahead place rotates to carry out the zoom effect.
Fixed frame 2 forms cylindric, and have cam path 2a and form on optical axis direction a plurality ofly directly advance groove 2b, 2c, this cam path 2a is by a plurality of tilting cam slot parts of the interior perimembranous that is formed at fixed frame 2 on the direction that tilts with respect to optical axis O and be formed by connecting at the circumference slot part that forms on the direction of circumference.Be provided with zoom drive unit 17 be used to the zoom action of carrying out photographic optical system at the peripheral part of this fixed frame 2, and, be equipped with the focusing driver element 18 be used to the focus operation that carries out photographic optical system in the inside of fixed frame 2.
Zoom drive unit 17 comprises as the position transducer (not shown) of the position of the zoom motor 17a in zoom drive source, gear row (rotary transfer machine) 17b that transmits the driving force of zoom motor 17a, detection cam frame 5 and wide gear (long gear) 17c etc.And then, by zoom motor 17a, carry out the zoom action of the varifocal optical system (first group of lens 21, second group of lens 22, the 3rd group of lens 23) that helps the zoom action in the photographic optical system that drives lens barrel 1 on the direction of optical axis O, and also carry out driving from photographic state to contraction state the contractive action of lens barrel 1.In addition, the wide gear 17c of zoom drive unit 17 is disposed in the gear incorporating section 2d of fixed frame 2 in the turning axle mode parallel with optical axis O, and is supported for free to rotate with the state that exposes in the interior perimembranous of fixed frame 2.
Focusing driver element 18 comprises: make motor reel be parallel to the focusing motor 18a of the conduct focusing drive source that optical axis O configures; Screw mandrel (lead screw) 18b that forms as one with the turning axle of focusing motor 18a; Be screwed together in the nut 18c on screw mandrel 18b; With in the photographic optical system of detector lens lens barrel 1 help focus operation to position transducer (not shown) that is formed by optical chopper of the origin position of focus optical system (the 4th group of lens 24) etc.And, by focusing motor 18a to the 4th group of lens 24 in the driving of focusing on the direction of optical axis O.The detailed construction of focusing driver element 18 and action narration in the back.
Cam frame 5 forms cylindric, is embedded in the interior perimembranous of fixed frame 2 with states free to rotate and advance and retreat.Quadrate part after the periphery of cam frame 5, be formed with in a plurality of cam path 2a that can be embedded in respectively fixed frame 2 with being free to slide a plurality of cam follower 5a and with the wide gear 17c meshed gears 5b of section of zoom drive unit 17.
As mentioned above, the cam follower 5a of cam frame 5 is embedded in the mode that can be free to slide in the cam path 2a of fixed frame 2, gear part 5b and wide gear 17c engagement.Therefore, thus when the zoom motor 17a that drives zoom drive unit 17 drove wide gear 17c rotation, this driving force was delivered to cam frame 5 via gear part 5b, thereby makes this cam frame 5 rotations.Like this when 5 rotation of cam frame, the cam follower 5a of this cam frame 5 moves along the tilting cam slot part of the cam path 2a of the inclination of fixed frame 2, thereby cam frame 5 forwards stretches out until the short focal position of photographic state is wide-angle side (mobile terminal, the place ahead) from the position (mobile terminal, rear) that is in contraction state while rotating.And then, when lens barrel 1 is in photographic state, from move to the zoom the telescope end of the long focal position of conduct as the wide-angle side of short focal position, this cam frame 5 mobile terminal forwardly is only driven on sense of rotation, can not advance and retreat on the direction of optical axis O because of the circumference slot part of cam follower 5a and cam path 2a.
And, at the peripheral part of cam frame 5, be formed with first group and use cam path 5c on the direction that tilts with respect to optical axis O, in the interior perimembranous of cam frame 5, be formed with second group of use cam path 5d and the 3rd group and use cam path 5e on the direction that tilts with respect to optical axis O.
Floating drum wedge 6 forms drum, is embedded in the interior perimembranous of cam frame 5 in the mode that can relatively rotate freely.At the rear end of floating drum wedge 6 peripheral part, outstanding toward the outer side be provided be embedded into fixed frame 2 directly advance the guide protrusion 6a of section in groove 2b.Thus, this floating drum wedge 6 can be mobile along the direction advance and retreat of optical axis O in the same way with cam frame 5 one under the state of frame 2 restricting rotations that is fixed.
This floating drum wedge 6 is adapted to: the interior perimembranous that is embedded in cam frame 5 under bayonet socket jut 6b is embedded into state in the circumferential groove 5g of the circular depressions on the flange part 5f that is arranged at cam frame 5.Thus, floating drum wedge 6 is combined into and can relatively rotates with respect to cam frame 5 by bayonet socket (bayonet), and can not move relative to advance and retreat on the direction of optical axis O with respect to cam frame 5.
And second group of having that mode with periphery in connecting forms on the direction of optical axis O of floating drum wedge 6 is with directly advancing groove 6c and the 3rd group with directly advancing groove 6d.
And second group of guide protrusion 11a of section that second group of frame 11 arranged with embedding in directly advancing groove 6c at floating drum wedge 6 embeds with in directly advancing groove 6d the guide protrusion 10b of section that the 3rd group of unit 10 arranged at the 3rd group.Thus, floating drum wedge 6 is supported for second group of frame 11 and shutter/3rd a group unit 8 can freely to advance and retreat and they are rotated restriction.
Lead-frame 7 forms cylindric, and perimembranous has the bayonet socket projection (not shown) in the engagement groove (not shown) that is embedded in cam frame 5 in the rear end.And, in the interior perimembranous of lead-frame 7, on the direction of optical axis O, be formed with for the cam follower 12a of rear peripheral part that is formed at first group of frame 12 chimeric directly advance groove 7b.
And lead-frame 7 is configured to be combined with cam frame 5 bayonet sockets under the state of the interior perimembranous that is embedded in fixed frame 2.At this moment, the guide protrusion 7a of section of lead-frame 7 is embedded in directly advancing in groove 2c of fixed frame 2.Thus, lead-frame 7 is same with floating drum wedge 6, being rotated with respect to fixed frame 2 under the state of restriction, for the direction along optical axis O, moves with cam frame 5 one.
It is cylindric that second group of frame 11 forms, and is configured to be embedded in the state in the interior perimembranous of floating drum wedge 6.Substantial middle section at this second group of frame 11 keeps second group of lens 22, has laterally the outstanding guide protrusion 11a of section that arranges and the outstanding cam follower 11b that arranges laterally on this guide protrusion 11a of section at the peripheral part of this second group of frame 11.
The 11a of guide protrusion section is embedded in second group of floating drum wedge 6 with directly advancing in groove 6c, cam follower 11b insert logical second group with directly advancing groove 6c, and slidably be embedded in second group of use cam path 5d of the cam frame 5 of its arranged outside.Thus, second group of frame 11 driven by advance and retreat by the rotation of cam frame 5 under the state that has been carried out the rotation restriction by floating drum wedge 6.
And second group of frame 11 constitutes: in the situation that cam frame 5 is positioned at the mobile terminal, rear, together be embedded into interior all sides of fast doorframe 30 as the part of side and the part as the lens of side.
It is cylindric that first group of frame 12 forms, and be configured to be embedded in the state between cam frame 5 and lead-frame 7.Object side at this first group of frame 12 maintains first group of lens 21.And, in the interior perimembranous of first group of frame 12, to be embedded into first group of mode of using in cam path 5c of the peripheral part that is formed at cam frame 5, equally spaced be equipped with a plurality of (for example three) cam follower (not shown) towards the inboard at interior Zhou Fangxiang.
And, as mentioned above, be formed at first group of frame 12 the rear end peripheral part cam follower 12a and the interior perimembranous that is formed at lead-frame 7 directly to advance groove 7b chimeric, cam follower and the peripheral part that is formed at cam frame 5 first group of interior perimembranous that is formed at first group of frame 12 is chimeric with cam path 5c.Thus, first group of frame 12 carried out being driven by advance and retreat by the rotation of cam frame 5 under the state of rotation restriction being directed frame 7.
Shutter/3rd group unit 8 constitutes and comprises: the fast doorframe 30 that keeps tripper; With keep the 3rd group of frame 10 of the 3rd group of lens 23 at the rear side of fast doorframe 30.
Fast doorframe 30 has the morphosis on the plate member of circular shape of opening tripper etc. is remained on substantial middle section, tripper comprises to be made the blade that central opening opens and closes and drive the shutter actuator etc. that this blade makes its rotation.
The 3rd group of frame 10 has the maintaining part 10a for the drum that keeps the 3rd group of lens 23, and this maintaining part 10a is fixed on fast doorframe 30 with the states that the rear from fast doorframe 30 is embedded in fast doorframe 30.And, equally spaced be provided with toward the outer side a plurality of (for example three) guide protrusion 10b of section at the place ahead peripheral part of the 3rd group of frame 10 in peripheral direction, further be provided with toward the outer side respectively cam follower 10c on these guide protrusions 10b of section.
And, the 3rd group of frame 10 is configured to be embedded in the state of the inside of floating drum wedge 6, the 10b of guide protrusion section is embedded in the 3rd group of floating drum wedge 6 with directly advancing in groove 6d, and cam follower 10c connects the 3rd group with directly advancing groove 6d and being embedded into the 3rd group of cam frame 5 with in cam path 5e.Thus, the 3rd group of Yong Zhi Jin frame 30 driven by cam frame 5 advance and retreat under the state that has been carried out the rotation restriction by floating drum wedge 6.
Be equipped with volute spring 35 between second group of frame 11 and shutter/3rd group unit 8.Thus, second group of frame 11 and shutter/3rd group unit 8 are each other by to the direction application of force of leaving.One end of volute spring 35 is inserted in the interior perimembranous of the fast doorframe 30 of shutter/3rd group unit 8 in chimeric mode, the other end of volute spring 35 is inserted in the peripheral part of the lens retaining part of second group of frame 11 in chimeric mode.
And, as side, dim light optical filtering (ND optical filtering) 40 is installed at the 3rd group of lens.By being disposed at the picture side of the 3rd group of lens, thus be disposed at other parts, for example the situation between second group of lens 22 and the 3rd group of lens 23 is compared, and can use small-sized ND optical filtering.In addition, also this ND optical filtering 40 can be set.
The 4th group of frame 13 is for keeping the 4th group of lens 24 and having the roughly discoideus members of frame of circular open at central portion.The 4th group of frame 13 is supported on the inside of fixed frame 2 by focusing driver element 18 in the mode that can advance and retreat on optical axis direction.And focusing driver element 18 is incorporated on fixed frame 2 via LD main body 19 and the base component 101 as focusing driver element component for fixing.
Then, the support of 18 pairs of the 4th group of frames 13 of focusing driver element and the mechanism of driving are described.Fig. 5 is the cut-open view of the 4th group of lens 24 that comprise image unit shown in Figure 1, the 4th group of frame 13 and the driver element 18 of focusing.This figure passes through the cut-open view of the section of screw mandrel 18c and focusing leading axle 18f described later central axis separately simultaneously.
Focusing motor 18a has the carriage 18d integrally formed with the casing of this focusing motor 18a.Carriage 18d have extend from the sidepiece of the casing of focusing motor 18a to optical axis direction and leading section to the shape of the rotation shaft side bending of motor.The leading section of this carriage 18d supports the leading section of the screw mandrel 18b that the turning axle with the motor 18a that focuses forms as one in the mode that can rotate.Therefore, screw mandrel 18b at leading section this 2 place of focusing motor 18a and carriage 18d by dual-gripper.By adopting in such a way, can prevent from producing vibration along with the rotation of screw mandrel 18b, can make focusing driver element 18 quietization.And, being provided with threaded hole on carriage 18d, 18e is fixed on LD main body 19 by focusing motor mounting screw.
And nut 18c screws on screw mandrel 18b with the state that supported frame 18d has limited rotation.Therefore, screw mandrel 18b rotation when driving focusing motor 18a, nut 18c is mobile along the screw mandrel advance and retreat along with this rotation.
And, on LD main body 19 and in the position that approaches focusing motor 18a, insertion is provided with the main focusing leading axle 18f that extends on optical axis direction, and, with the focusing motor position left on also insert be provided with the pair focusing leading axle 18h(that extends with reference to Fig. 1 on optical axis direction).Because main focusing leading axle 18f and secondary focusing leading axle 18h run through the 4th group of frame 13 in the mode that can slide, thereby the 4th group of frame 13 can move on optical axis direction along main focusing leading axle 18f and the secondary leading axle 18h that focuses.And, owing to also being provided with secondary focusing leading axle 18h except main focusing leading axle 18f, thereby can prevent that the 4th group of frame 13 from rotating around main focusing leading axle 18f.
And screw mandrel 18b connects the peripheral part of the 4th group of frame 13 between focusing motor 18a and nut 18c.On the other hand, on main focusing leading axle 18f, reel between LD main body 19 and the 4th group of frame 13 force application spring is installed, LD main body 19 and the 4th group of frame 13 are by to the direction application of force of mutually leaving.Thus, the 4th group of frame 13 all the time with the face butt at the rear of nut 18c.
In addition, be connected with on LD main body 19 comprise to focusing drive drive signal line that the focusing motor 18a of use connects and the FPC substrate 117(of the origin position signal lines that connects to the control circuit of camera head with reference to Fig. 2~4).
Thus, when screw mandrel 18b rotated by the driving force of focusing motor 18a of focusing driver element 18, nut 18c was along the screw mandrel 18b driving of being advanced and retreat.When nut 18c is advanced and retreat driving, with the 4th group of frame 13 of the face butt at the rear of nut 18c by along the direction of focusing leading axle 18f, 18h, namely the direction advance and retreat along optical axis O drive, thereby be adjusted to suitable focusing position when being in photographic state, and being located in predetermined punctured position when contractive action.
In addition, in Fig. 5, the rearward end of focusing motor 18a, main focusing leading axle 18f and more rearward giving prominence to than the lens face of the rear side (as side) of the 4th group of lens 24 that are positioned at punctured position with the part of their chimeric LD main bodys 19.As described later, these partial configurations become to connect handshake correction apparatus.On the other hand, secondary focusing leading axle 18h does not connect handshake correction apparatus 105.
The structure of sensor unit 100 then, is described with reference to Fig. 6.
Sensor unit 100 is the unit with the imaging apparatus 110 that looks like blurring compensation device 105 and image data generating that looks like jitter correction.Have (with reference to Fig. 1) as blurring compensation device 105: base component 101; Extend the Y leading axle 109,111 be supported on base component 101, Y feed screw 112 and extend and be supported on X feed screw 113 on base component 101 along directions X (the 2nd direction) along Y-direction (the 1st direction); Supported to the sliding part 114 that can move by Y leading axle 111 and Y feed screw 112 on Y-direction; Extend and be supported on X leading axle 115,116 on sliding part 114 along directions X; Supported to by X feed screw 113 and X leading axle 115,116 the sensor holding frame 119 that can slide on directions X; Be installed on optics low pass filtered light microscopic 118(on sensor holding frame 119 with reference to Fig. 2~Fig. 4) and imaging apparatus 110(with reference to Fig. 1~Fig. 4); And be supported on Y motor (the 1st motor) 120 on base component 101 and X motor (the 2nd motor) 130(with reference to Fig. 1).
In addition, directions X is mutually vertical with Y-direction, and is the direction vertical with optical axis O, is along horizontal (directions X) of imaging apparatus 110 and the direction of vertical (Y-direction).
Y motor 120 is to make Y feed screw 112 rotation and stepping motor that sliding part 114 is carried out the driving of Y-direction via gear row 121.And X motor 130 is to make X feed screw 113 rotation and stepping motor that sensor holding frame 119 is carried out the driving of directions X via gear row 131.Not shown with the FPC(that the pedestal circuit substrate is connected) are connected with the X motor with Y motor 120 and are connected and driven.Thus, sensor holding frame 119 is driven along the face parallel with the sensitive surface of imaging apparatus 110 by Y motor 120 and X motor 130, thereby the picture shake of the optical image that is formed at imaging apparatus 110 via lens barrel 1 is proofreaied and correct.
In addition, on Y leading axle 111 and X leading axle 116 respectively package compression helical spring 122,132 is arranged.And between base component 101 and sliding part 114 and between base component 101 and sensor holding frame 119, suspension is provided with draft helical spring 123,133 respectively.Thus, sliding part 114 and sensor holding frame 119 are respectively by to the origin position application of force.
Imaging apparatus 110 is connected with FPC 141, and carries on sensor holding frame 119.In the rear side of this imaging apparatus 110, in the mode that clips FPC141, heat sink 142 is installed on sensor holding frame 119.
Here, as the general projection of shape of observing from lens barrel 1 side of the base component 101 of blurring compensation device 105 for semicircle and rectangle so that the shape that the mode that the straight line portion of semicircle overlaps with a limit of rectangle combines.The 1st bight 151 among 2 bights of rectangle part is equipped with the 1st drive division 161 that comprises Y motor 120 and gear row 121, is equipped with the 2nd drive division 162 that comprises X motor 130 and gear row 131 in the 2nd bight 152 as another bight.
And the circular arc of the semi-circular portions of base component 101 is along the periphery of the rear end part of fixed frame 2, in the outside across the base component 101 of the opposition side of optical axis O in the 2nd bight 152, be the outside of fixed frame 2, disposes zoom drive unit 17.The zoom motor 17a of zoom drive unit 17 is connected (with reference to Fig. 1) via the wide gear 17c in the gear incorporating section 2d of gear row 17b and fixed frame 2.
Inside at fixed frame 2, be provided with focusing driver element 18 in the position with optical system Bu Gan Wataru, under the state in the place ahead, shake correction unit 105 is interior gives prominence to and connect to picture for the rearward end on LD main body 19 of being fixed in of focusing motor 18a at the motor reel of focusing motor 18a.And the rearward end of main focusing leading axle 18f also connects as blurring compensation device 105 under the state that is fixed on LD main body 19.In addition, between heat sink 142 and sliding part 114, notch is set to observe the mode with opening along optical axis direction in sensor unit 100, focusing motor 18a and main focusing leading axle 18f are connecting this notch on the direction of optical axis.That is, focusing motor 18a and main focusing leading axle 18f connect the gap between sliding part 114 and sensor holding frame 119.And, have the gap between focusing motor 18a and main focusing leading axle 18f and heat sink 142 and sliding part 114, make when looking like jitter correction, heat sink 142 and sliding part 114 are not contacting when directions X and/or Y-direction move.When adopting such structure, can make the external diameter miniaturization of fixed frame.Therefore, can make flashlamp and tripod screw more near fixed frame, can realize the miniaturization of camera head.And, when assembling lens barrel 1 and sensor unit 100, focusing driver element 18 and picture blurring compensation device 105 Bu Gan Wataru, and, can be from the rear Visual Confirmation focusing motor 18a of picture blurring compensation device 105 and the position of main focusing leading axle 18f, thereby easily assembling.
The FPC141 that is connected with imaging apparatus 110 extends from imaging apparatus 110 along directions X in the rear side of base component 101.This FPC141 is connected with the pedestal circuit substrate, thereby the image of being taken by imaging apparatus 110 is presented on the not shown display device such as liquid crystal panel, and is recorded in recording medium.
The below effect of the camera head that relates to of the present embodiment that as above consists of like that of explanation.
At first, for the starting by camera head etc. makes camera head be in photographic state, make the 5 dextrad rotations of cam frame by zoom drive unit 17, lens barrel 1 is stretched out until mobile terminal, the place ahead from contraction state (mobile terminal, rear).Thereby cam frame 5 is positioned at mobile terminal, the place ahead when becoming wide-angle side as short focal position, and as shown in Figure 3, each members of frame forwards moves towards the direction along optical axis O, and lens barrel 1 becomes the state of overall elongated.
Then, when zoom was adjusted, cam frame 5 mobile terminal rotation was forwardly adjusted the position of first group of frame, second group of frame and the 3rd group of frame, in order to reach the picture multiplying power of expectation.For example, at the telescope end as long focal position, as shown in Figure 4, lens barrel 1 is in the state of being pulled out to greatest extent, and the position of second group of frame and the 3rd group of frame also contrasts this position and adjusts.
And, when focusing is adjusted, drive focusing driver element 18, drive the 4th group of frame 13 and advance and retreat on optical axis direction, adjust the position of the optical axis direction of the 4th group of lens 24.That thus, can carry out expecting have carried out the shooting of the image of focusing adjustment as multiplying power.
And, when shooting, use the not shown sensors such as angular-rate sensor to detect the direction of hand shake, driving is as the 1st drive division 161 and the 2nd drive division 162 of blurring compensation device 105, thereby to the direction driving sensor holding frame 119 of the opposite direction of hand shake, shake is proofreaied and correct to picture.At this moment, focusing motor 18a and main focusing leading axle 18f connect as blurring compensation device 105, but due between focusing motor 18a and focusing leading axle 18f and picture blurring compensation device, observe from optical axis direction and be provided with the gap, thereby can not hinder as jitter correction.
And, focusing motor 18a and main focusing leading axle 18f connect as the sliding part 114 of blurring compensation device 105 and the gap between sensor holding frame 119, thereby the position that need not to avoid the rear side of the position that configures as blurring compensation device 105 configures focus motor 18a and main focusing leading axle 18f.Therefore, can make the bore miniaturization of fixed frame 2.As a result, flashlamp and tripod screw etc. are configured near the fixed frame 2 of camera head main body, the miniaturization of energy implement device integral body.
And when the photographic states such as the pent situation of power supply of camera head finished, the rotation of cam frame 5 was followed in cam frame 5 left-handed rotations of lens barrel 1, and each members of frame becomes contraction state shown in Figure 2 to moving along the rear of optical axis O.At this moment, effectively utilize in the lens barrel at first group of lens 21 rear of diameter maximum space, formed blind area (dead space) and take in focusing motor 18a and main focusing leading axle 18f.
As mentioned above, according to present embodiment, lens barrel 1 comprises as the 4th group of lens 24 of focus lens and drives along optical axis the focusing driver element 18 that the 4th group of lens 24 are advanced and retreat, as the focusing motor 18a of a part of focusing driver element 18 and main focusing leading axle 18f not connect with described entering into as the interior state of blurring compensation device 105 as blurring compensation device 105 Gan Wataru ground, thereby can make the bore miniaturization of fixed frame 2, can make the apparatus main body miniaturization.
In addition, connecting focus motor 18a and the main focusing leading axle 18f of being not limited to as blurring compensation device 105, can be also other inscapes of secondary leading axle 18h and focusing driver element 18.Perhaps, can be also that an only side in focusing motor 18a and main focusing leading axle 18f is in the state that enters into picture blurring compensation device 105 " for example the rearmost end of the electromagnetism linear electric motors of optical axis or leading axle support portion is positioned at the rear foremost (as side) of picture blurring compensation device in hands-off mode, and perhaps the part of the movable part in the picture blurring compensation device forms notch recesses ".Particularly, by entering at the focusing motor 18a that makes large as a comparison parts under the picture state of blurring compensation device 105, in the part as blurring compensation device, through hole is set, make lens under contraction state and the configuration of camera lens frame become easily, can realize the miniaturization of camera head 1.
And, observe along optical axis direction, focusing motor 18a and main focusing leading axle 18f connect the outside of the moving area of sensor holding frame 119 in the zone of the sliding part 114 of picture blurring compensation device 105, thereby can be at the position configuration focusing driver element 18 of more close imaging apparatus 110.Therefore, can further make lens barrel 1 and camera head integral miniaturization.
(modified example)
Fig. 7 a to Fig. 7 e is rear view and the cut-open view of the moving coil type electromagnetism linear electric motors that relate to of the modified example of the focusing driver element of present embodiment.
Here, as shown in Fig. 7 a to Fig. 7 e, the electromagnetism linear electric motors of the moving coil type that replaces the focusing driver element are described.
Particularly, the electromagnetic type linear electric motors 18 of the driving mechanism of the 4th group of lens 24 using hollow coil described.
Fig. 7 a is the rear view of the 4th group of lens 24, the 4th group of frame 13 and electromagnetic type driver element 18.Fig. 7 b to Fig. 7 e is the cut-open view of the 4th group of lens 24, the 4th group of frame 13 and electromagnetic type linear electric motors 18.To be disposed at as the electromagnetic type linear electric motors fixedly the structure of the electromagnetic type linear electric motors 18 on the LD main body 19 of the parts of use describe.
3 outer yoke 18ca~18cc are the rectangular shapes that extend towards optical axis direction, and outer yoke 18ca uses mounting screw 18e to be fixed on the vertical component effect 19a of LD main body 19.And, four jiaos of 3 the outer yokes accessory 18cg(magnetic materials by rectangular shape) combined formation recess and integrated.Interior yoke 18b is the rectangular shape that extends towards optical axis direction, and two ends are fixed on side walls 18ce, the 18cf of accessory 18cg.3 permanent magnet 18aa~18ac be magnetized at thickness direction, towards the rectangular shape that optical axis direction extends, be fixed on the tabular surface of 3 outer yoke 18ca~18cc.
And the side walls 18cf of accessory 18cg and permanent magnet 18aa~18ac observe towards optical axis direction has the gap as side, the end face of object side and permanent magnet 18aa~18ac and the side walls 18ce butt of accessory 18cg.And permanent magnet 18aa~18ac and interior yoke 18b form magnetic gap.Be assembled into the jut 13a of the 4th group of frame 13 in the peristome 18ch of accessory 18cg, drive coil 18d observes in the plane vertical with optical axis direction from object side and forms the hollow shape with " mouthful word ", is adhesively fixed on the jut 13a of the 4th group of frame 13.And, be configured in above-mentioned magnetic gap.And secondary focusing leading axle 18h is fixed on LD main body 19, adopts the configuration with axially parallel when being assembled into.Secondary focusing leading axle 18h is inserted in the sliding part 13c of the 4th group of frame 13, and the 4th group of frame 13 supported by these 2 leading axles parallel with optical axis direction of main focusing leading axle 18f and secondary focusing leading axle 18h.Support by this, the rotation when the 4th group of frame 13 moved towards optical axis direction stops (preventing the generation of the turning moment of the 4th group of frame 13).
The leading section that constitutes like this accessory 18cg as shown in Fig. 7 b~7d connects as blurring compensation device.Thus, can provide a part that does not make electromagnetic type linear electric motors 18 to interfere with the picture blurring compensation device and small-sized camera head.
And, make 3 permanent magnet 18aa~ac adopt arranged opposite by 3 faces for the drive coil 18d of the 4th group of frame 13, can improve when driving the 4th group of lens 24 of the 4th group of frame 13 towards optical axis direction and drive sensitivity.
In addition, outer yoke 18ca~18cc can adopt side walls 18ce, the 18cf of the accessory 18cg that utilized magnetic material and accessory 18cg to carry out integrated sheet metal processing.Then, change the focusing driver element into, the action of electromagnetic type linear electric motors 18 is described.
Never illustrated focusing driving circuit provides to drive coil 18d and applies voltage.Permanent magnet 18aa, 18ab, 18ac, outer yoke 18ca, 18cb, 18cc, interior yoke 18b and magnetic gap by electromagnetic type linear electric motors 18 form magnetic loop.Utilization imposes on the thrust (the driving active line that intersects also referred to as the electric current of magnetic flux and coil) of voltage He this magnetic loop of drive coil 18d, makes to have kept the 4th group of frame 13 of the 4th group of lens 24 to move towards optical axis direction.
At this moment, the 4th group of frame 13 is by main focusing leading axle 18f and secondary focusing leading axle 18h guiding.And, on LD main body 19, in the position approaching with the focusing driver element 18 that uses the electromagnetic type linear electric motors, be inserted with the main focusing leading axle 18f that extends towards optical axis direction, and, in the position of separating with electromagnetic type linear electric motors 18, also be inserted with towards the pair of optical axis direction extension and focus leading axle 18h(with reference to Fig. 1).Because main focusing leading axle 18f and secondary focusing leading axle 18h connect the 4th group of frame 13 slidably, thereby the 4th group of frame 13 can move towards optical axis direction along main focusing leading axle 18f and the secondary leading axle 18h that focuses.
And, except main focusing leading axle 18f, also be provided with secondary focusing leading axle 18h, thereby can prevent that the 4th group of frame 13 from rotating around main focusing leading axle 18f.
In addition, in Fig. 7 b, the rearward end of electromagnetic type driver element 18 and main focusing leading axle 18f the and more rear is outstanding to the lens face than the rear side (as side) of the 4th group of lens 24 of punctured position with the part of their chimeric LD main bodys 19.As described later, these partial configurations become to connect handshake correction apparatus.On the other hand, secondary focusing leading axle 18h does not connect handshake correction apparatus 105.The electromagnetic type linear electric motors of moving coil type have been described here, yet also can be replaced into the movable magnet type linear electric motors that are fixed with 3 moving-magnets at movable part.In addition, here said " entering into " can be: " for example; the rearmost end of the electromagnetic type linear electric motors on optical axis and leading axle support portion 19b is positioned at the rear foremost (as side) of picture blurring compensation device in hands-off mode, perhaps the part of the movable part in the picture blurring compensation device forms notch recesses ".
And " perforation " refers to have as blurring compensation device the opening that connects at optical axis direction, and the part of focusing driver element is in the state that is inserted at least in part in this opening.That is, as shown in Fig. 7 e, the part of leading axle support portion 19b need not necessarily to extend to the rear of picture blurring compensation device.And, can be that to enter into as the states in blurring compensation device 105 are " for example, in picture blurring compensation device 105 in a part (object side) the formation notch recesses of movable part " for the part (having assembled the parts of the outer yoke 18ca~18cc that is disposed on LD main body 19, interior yoke 18b and permanent magnet 18aa~18ac) of electromagnetic type linear electric motors.Specifically, has recess (otch) as the movable member that is equipped with imaging apparatus in blurring compensation device at the object side of optical axis direction, this recess and have the gap on the optical axis direction of electromagnetic type linear electric motors 18 between the end as side, both sides' arranged opposite.And, have recess as the fixed part of blurring compensation device 10 at the object side of optical axis direction, this recess and have the gap on the optical axis direction of electromagnetic type linear electric motors 18 between the end as side, both sides' arranged opposite.Perhaps, cross the object side of optical axis direction and have recess as the movable member that is equipped with image unit of blurring compensation device 10 with as fixed part 102 both sides of blurring compensation device 10, this recess and electromagnetic type linear electric motors 18 have the gap on optical axis direction between the end as side, both sides' arranged opposite.
Be connected with FPC substrate 117 on LD main body 19, FPC substrate 117 comprises the drive signal line of moving coil 18d of the electromagnetic type linear electric motors 18 that lead to the drive source of focusing and the origin position signal lines of leading to the control circuit of camera head.
Main focusing leading axle is necessary to guide 4 groups of lens and does not make it depart from optical axis, has enough rigidity.Make bending shaft in the situation that rigidity is not enough, 4 groups of lens run-off the straights or bias cause the degeneration of optical property.
In the situation that the axle vibration-generating, the AF performance degradation.And, for dynamic image etc., bring discomfort to the user.Even secondary focusing leading axle bends, 4 groups of also not run-off the straights of lens.And, by separating spacing configuration with main focusing leading axle, can reduce the bias that the bending because of axle causes and produce.Therefore, can make main focusing leading axle thinner, can realize the miniaturization of lens barrel and camera head integral body.The electromagnetic type linear electric motors be configured in main focusing leading axle near, wanting in the situation that the position of separating with main focusing leading axle drives, produce sometimes vibration or produce warpage and can not drive.
In this case, although can drive by configuring a plurality of electromagnetic type linear electric motors, cause the complicated of cost rising and control.Cause the maximization of lens barrel and camera head integral body.As shown in Figure 7a, be provided with the MR installation of sensors 18i of section in a side of the 4th group of frame 13.(MR sensor and magnetic scale are not shown).This MR installation of sensors 18i of section disposes and the 4th group of integrated Hall element that engages of frame 13 (perhaps Ke Shi effect detection use reflective optical system).And the detection faces of MR sensor and the outside of accessory approach, and adopt opposed position.The 4th group of frame 13 and MR sensor move on optical axis direction integratedly.Be configured on the outside surface of accessory 18g at the small pieces near MR sensor and the opposed position NS utmost point, this accessory 18g is fixed with and is the magnetic scale that a row joint has been arranged a plurality of (with the preset space length formation).The mobile amplitude signal of exporting expectation by MR sensor (Hall element).Control circuit (CPU) is counted the signal intensity of MR sensor and generate interpolated signal near near the zero crossing the target location, thereby to being configured in integratedly the 4th group of drive coil 18d energising on frame 13, carry out the high-speed mobile action on optical axis direction, make the 4th group of lens 24 high speeds of the 4th group of frame 13 and move to accurately the target location to stop.In this case, use this MR sensor and magnetic scale, drive and the desired locations of the 4th group of lens 24 being positioned in mobile scope to be kept by the 4th group of frame 13 between most proximal end and unlimited far-end in the focusing by when photography.And the 4th group of lens 24 of the 4th group of frame 13 move to the most close imaging apparatus side and stop when shrinking.And the starting from punctured position by camera is positioned at the holding fix (also referred to as initial position) that stops at first.Double dot dash line in the 4th group of lens 24(Fig. 7 a figure-7d of the 4th group of frame 13 represents) position of the most close object side in camera coverage is the maximum projecting position of the 4th group of lens 24 being kept by the 4th group of frame 13.
As modified example, (use bonding agent or double sticky tape to attach) in the situation that not shown magnetic scale is directly installed on the outer yoke 18cb of magnetic material, owing to being error detection under the Hall element impact of the leakage magnetic flux of yoke outside, thereby can insert the flat board of nonmagnetic substance (for example, synthetic resin, aluminium, SUS material) between magnetic scale and outer yoke 18cb.
Other modified example is as follows.
For example, can make Fig. 5 of TOHKEMY 2005-234075 and the 4th group of lens 16 or the 3rd group of lens 54 shown in Figure 10 be used for moving back and forth (swing) along the optical axis direction slight distance.
And modified example of the present invention is utilized the electromagnetic type linear electric motors of moving coil type and is described.Yet certainly can use movable magnet type linear electric motors (also referred to as the electromagnetic type linear electric motors).In this situation, the part of electromagnetic type linearity coil is replaced as interior yoke and the fixed coil that is disposed at as on the LD main body of the component for fixing of electromagnetic type linear electric motors.

Claims (5)

1. camera head is characterized in that having: lens barrel, and it keeps the taking lens system that is made of a plurality of lens that comprise focus lens; Imaging apparatus, it receives through the formed optical image of described taking lens system and image data generating; And the picture blurring compensation device, it makes described imaging apparatus look like the jitter correction action at the face internal shift parallel with the sensitive surface of this imaging apparatus,
Described lens barrel comprises the electromagnetic type linear electric motors, and described electromagnetic type linear electric motors driving is described advances and retreat along optical axis to focus lens, and the part of these electromagnetic type linear electric motors enters into this as in blurring compensation device, not interfere with described picture blurring compensation device.
2. camera head according to claim 1, is characterized in that, the part of described electromagnetic type linear electric motors enters into and describedly is formed with through hole or otch as referring in blurring compensation device in this part as blurring compensation device.
3. camera head according to claim 1 and 2, is characterized in that,
Described have as blurring compensation device: base component is fixed with described lens barrel thereon; Sliding part, it is supported to and can move on the 1st direction vertical with described optical axis by this base component; And the sensor holding frame, its by this sliding part support to can with the 2nd direction of described optical axis and described the 1st perpendicular direction on move, and support described imaging apparatus,
Observe from described optical axis direction, the part of described electromagnetic type linear electric motors connects the outside of the moving area of described sensor holding frame in the zone of described sliding part.
4. camera head according to claim 1 and 2, is characterized in that, the sectional area of main focusing leading axle is greater than the sectional area of pair focusing leading axle.
5. camera head according to claim 4, it is characterized in that, observe described electromagnetic type linear electric motors from object side, the distance that the driving active line that the magnetic flux of drive coil and magnetic loop intersects and the distance between main focusing leading axle are focused between leading axle than described driving active line and pair is short.
CN201210418191.4A 2011-11-17 2012-10-26 Camera head Expired - Fee Related CN103123432B (en)

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20151104