CN103163623A - Lens drive mechanism, lens tube and video shooting device - Google Patents

Abstract

The invention discloses a lens drive mechanism, which is characterized in that a speed reduction mechanism comprises a combination of an angular contact bearing and a thrust roller bearing, which are installed on a drive force input shaft. When automatic focusing, a drive force from a drive source is transmitted to an outer ring of the angular contact bearing, and is synchronous to a roller of the thrust roller bearing which rotate by a roller holding part connected to the outer ring for automatic focusing, to rotate a drive force output shaft, thereby outputting a drive force of the lens. When manual focusing, a drive force transfer from a photographer is synchronous to the roller of the thrust roller bearing which rotate by the roller holding part connected to the thrust roller bearing for automatic focusing, to rotate the drive force output shaft, thereby outputting a drive force of the lens.

Description

Eyeglass driving mechanism, lens barrel and camera head

Technical field

The present invention relates to eyeglass driving mechanism, lens barrel and camera head, can insert eyeglass driving mechanism, lens barrel and the camera head that the cameraman utilizes the manual focus action of manually carrying out in the automatic focus operation that carries out in the driving force of using drive source.

Background technology

Existed following eyeglass driving mechanism in the past, this eyeglass driving mechanism operation setting in the focusing of the lens system of video camera or frequency still camera is switched between the manual focus that manually the carries out action by the cameraman and the automatic focus operation that undertaken by the driving force of drive source at the blocked operation member of camera or camera lens outside.But, in the camera with such eyeglass driving mechanism, the cameraman is by automatic focusing and after adjusting focal length, utilize and manually finely tune in the situation of focal length, the beginning of manual focus action latens, and sight is temporarily left from the photographic image of view finder etc., cause the photography difficulty under desirable opportunity.Therefore, require to have the camera of following eyeglass driving mechanism, this eyeglass driving mechanism just can not switch between the action of focus operation and manual focus automatically by loaded down with trivial details blocked operation.

For example, disclose following lens barrel in Japan's patented claim (speciallyying permit No. 3347344 communique), this lens barrel does not need special blocked operation just can roughly make continuously the such eyeglass action of focus lens for the input of two systems.Particularly, the motor driver of the lens barrel of Japan's patented claim (speciallyying permit No. 3347344 communique), for example when automatic focus operation, making motor is bar-shaped supersonic motor and with its driving, at this moment axle output link rotation, the ball member revolves round the sun around the axle output link while the rotation that rubs, thereby makes the rotation of rotation output link.In addition, when manual focus moved, when outside input link rotation, rotation was revolved round the sun around this axle output link while same ball member rubs, thereby made the rotation of rotation output link.

But, the motor driver of the lens barrel of record in Japan's patented claim (speciallyying permit No. 3347344 communique), when the switching of carrying out the action of automatic focus operation and manual focus, although need to and not operate on it at camera or camera lens outer setting blocked operation member, motor must have in the situation that based on manual focus action and transmission of drive force makes the axle output link not rotate the axle confining force (with reference to the 0022nd section) of degree left and right.Therefore, in the motor driver of putting down in writing in Japan's patented claim (speciallyying permit No. 3347344 communique), must have the output rotating shaft of the motor that restriction is used when carrying out the manual focus action to the structure of positive and negative two direction rotations, and must not have and can make this motor produce the structure of damage because of the transmission of the driving force of moving based on this manual focus, cause the complicated of structure.In addition, in Japan's patented claim (speciallyying permit No. 3347344 communique), as the motor that uses in motor driver, enumerated supersonic motor, but supersonic motor has problems also aspect cost except complex structure.

Summary of the invention

The present invention proposes in view of above-mentioned problem in the past, its purpose is the lens barrel and the camera head that a kind of eyeglass driving mechanism are provided and use this eyeglass driving mechanism, in the automatic focus operation that the driving force of using drive source is carried out, can insert the cameraman and utilize the manual focus action of manually carrying out, and simplification and cost degradation that can implementation structure.

The result that the present application people studies has with keen determination adopted following such eyeglass driving mechanism and lens barrel and the camera head that uses this eyeglass driving mechanism for addressing the above problem.

the eyeglass driving mechanism of the first embodiment of the present invention: the eyeglass driving mechanism of the first embodiment of the present invention, the reducing gear that uses in this eyeglass driving mechanism, when making mobile focusing that focus lens is slided along optical axis direction that is placed in via the eyeglass holding frame in lens barrel, in the automatic focus operation that the driving force of using drive source is carried out, can insert the cameraman and utilize the manual focus action of manually carrying out, it is characterized in that, this reducing gear includes the combination of angular contact bearing and thrust roller bearing, the inboard that this angular contact bearing encloses is within it run through and is inserted and fixed drive power output shaft section one distolateral, this thrust roller bearing runs through this driving force output axial region of insertion on its turning axle, and, the roller that has is combined with this driving force output axial region with the retainer that the mode that can rotate supports, when automatic focus operation, the driving force that comes from drive source is passed to the outer ring of this angular contact bearing, at this moment synchronize and drive with the roller of the thrust roller bearing that rotates with the roller maintaining part via the automatic focusing that is connected in this outer ring, make this driving force output axial region rotation, another distolateral outgoing mirror sheet driving force from this driving force output axial region, when manual focus moves, be passed to the manual focus roller maintaining part of this thrust roller bearing from the driving force of cameraman's transmission, synchronize with the roller of the thrust roller bearing that rotates via this roller maintaining part, this driving force output axial region rotation, another distolateral outgoing mirror sheet driving force from this driving force output axial region.

in addition, the eyeglass driving mechanism of the first embodiment of the present invention, preferably when making mobile focusing that focus lens is slided along optical axis direction that is placed in via the eyeglass holding frame in lens barrel, in the automatic focus operation that the driving force of using drive source is carried out, can insert the cameraman and utilize the manual focus action of manually carrying out, this eyeglass driving mechanism has: stationary magazine creel, the cam canister that runs through the periphery that is inserted into this stationary magazine creel and configure and this eyeglass holding frame is moved by self rotation along optical axis direction, and will come from the driving force of this drive source to the reducing gear of this cam canister transmission, this reducing gear includes: angular contact bearing, it has the automatic focusing driving force input part of the driving force of accepting to come from drive source in the outer ring side, and this outer ring between the inboard of inner ring of clamping ball run through insertion and fixed-bearing axis, thrust roller bearing, it has the first roller maintaining part and the second roller maintaining part, this the first roller maintaining part is provided with the automatic focusing driving force input part that transmits the rotary driving force that comes from this angular contact bearing, and this second roller maintaining part is provided with via the roller transmission based on the manual focus of the driving force of cameraman's operation driving force input part, thrust roller bearing is pressed pressure ring, and it is pressed this second roller maintaining part via elastic component, and be configured with the state with this second roller maintaining part rubbing contact for the roller of this thrust roller bearing of clamping stably to this first roller maintaining part side, and driving force output axial region, it, is fixed on the turning axle of this thrust roller bearing in mode that can synchronous rotary to the cam canister transmission for the rotary driving force that will come from this thrust roller bearing, when automatic focus operation, the driving force that comes from drive source that is passed to this angular contact bearing is passed to the first roller maintaining part of this thrust roller bearing, at this moment this second roller maintaining part and this thrust roller bearing are pressed cyclic group and are kept bonding state in friction force, the first roller maintaining part synchronous rotary of this driving force output axial region and this thrust roller bearing, the slip of eyeglass holding frame is mobile focuses thereby make, when manual focus moves, be passed to the manual focus driving force input part of this thrust roller bearing from the driving force of cameraman's transmission, at this moment utilize the driving force of transmitting from the cameraman, this the second roller maintaining part and this thrust roller bearing are disengaged by the bonding state based on friction force of pressure ring, the second roller maintaining part synchronous rotary of this driving force output axial region and this thrust roller bearing, the slip of eyeglass holding frame is mobile focuses thereby make.

In addition, the eyeglass driving mechanism of the first embodiment of the present invention, preferred described drive source is the DC motor, described reducing gear is fixed on gear on worm on the output rotating shaft of this DC motor and includes the engaging structure of this gear on worm and worm-gear toothing.

in addition, in the eyeglass driving mechanism of the first embodiment of the present invention, preferred described angular contact bearing its outer ring be provided with the output rotating shaft that is fixed on described DC motor on the worm-gear toothing of gear on worm engagement, the roller of described thrust roller bearing is by consisting of more than three, this roller is combined with described driving force output axial region with the retainer that the mode of rotating freely supports, described the first roller maintaining part is circular plate shape and combines with the outer ring of this angular contact bearing, described the second roller maintaining part is to combine to connect on the circular plate inserts the shape that this driving force is exported the cylinder of axial region, between this circular slab shape part and described thrust roller bearing are by pressure ring, check washer is set, periphery and this thrust roller bearing of this barrel shape section combine by friction force by pressure ring, in the situation that this second roller maintaining part and this thrust roller bearing by the frictional engagement power of pressure ring greater than the frictional engagement power of setting in this eyeglass driving mechanism, this the second roller maintaining part and this thrust roller bearing are maintained by the bonding state of pressure ring, normally carry out automatic focus operation, in the situation that this second roller maintaining part and this thrust roller bearing by the frictional engagement power of pressure ring less than the frictional engagement power of setting in this eyeglass driving mechanism, this the second roller maintaining part rotation, normally carry out the manual focus action.

In addition, in the eyeglass driving mechanism of the first embodiment of the present invention, preferred described thrust roller bearing is at the slipping plane coating moment of torsion oil of roller.

In addition, the eyeglass driving mechanism of the first embodiment of the present invention preferably has: the focusing gear, and it is meshed with being fixed on the gear that described driving force exports on axial region, and is rotated centered by optical axis; And arm member, one is distolateral to combine with this focusing gear, and the jut of another distolateral periphery with being arranged at described cam canister combines; Make focus lens is slided along optical axis direction mobile when, make the cam canister rotation from the driving force that is fixed on the gear transmission on this driving force output axial region via this focusing gear and this arm member, move thereby the eyeglass holding frame is slided.

In addition, the eyeglass driving mechanism of the first embodiment of the present invention, preferably the periphery at lens barrel has: manual focus is with encircling; And the manual focus rim gear wheel, one is distolateral is embedded in this manual focus with the interior week of ring, and another distolateral and manual focus in the second roller maintaining part setting of described thrust roller bearing utilizes the engagement between gear with the driving force input part and combines; When the manual focus action of being undertaken by the cameraman, rotate with ring by operating this manual focus, the slip of eyeglass holding frame is moved focus.

The lens barrel of the first embodiment of the present invention: the lens barrel of the first embodiment of the present invention is characterised in that, has used the eyeglass driving mechanism of the first above-mentioned embodiment.

The camera head of the first embodiment of the present invention: the camera head of the first embodiment of the present invention is characterised in that, has used the lens barrel of the first above-mentioned embodiment.

the eyeglass driving mechanism of the second embodiment of the present invention: the eyeglass driving mechanism of the second embodiment of the present invention, the reducing gear that uses in this eyeglass driving mechanism, when making mobile focusing that focus lens is slided along optical axis direction that is placed in via the eyeglass holding frame in lens barrel, in the automatic focus operation that the driving force of using drive source is carried out, can insert the cameraman and utilize the manual focus action of manually carrying out, it is characterized in that, this reducing gear includes the combination of first order angular contact bearing and second level angular contact bearing, the inboard that this first order angular contact bearing encloses is within it run through and is inserted and fixed drive power input axial region one distolateral, the inboard that this second level angular contact bearing encloses is within it run through and is inserted and another of fixed drive power input axial region is distolateral, and, distolateral the combining that the retainer that the ball that has is supported in rotation mode freely and driving force are exported axial region, this driving force output axial region is being configured with the mode of this second level angular contact bearing synchronous rotary, when automatic focus operation, the driving force that comes from drive source is passed to this driving force input axial region, at this moment synchronize with the ball that rotates via the inner ring of this second level angular contact bearing that is connected in this driving force input axial region, this driving force output axial region rotation, another distolateral outgoing mirror sheet driving force from this driving force output axial region, when manual focus moves, be passed to the outer ring of this second level angular contact bearing from the driving force of cameraman's transmission, at this moment synchronize with the ball that rotates via this outer ring, this driving force output axial region rotation, another distolateral outgoing mirror sheet driving force from this driving force output axial region.

in addition, the eyeglass driving mechanism of the second embodiment of the present invention, preferably when making mobile focusing that focus lens is slided along optical axis direction that is placed in via the eyeglass holding frame in lens barrel, in the automatic focus operation that the driving force of using drive source is carried out, can insert the cameraman and utilize the manual focus action of manually carrying out, this eyeglass driving mechanism has: stationary magazine creel, the cam canister that runs through the periphery that is inserted into this stationary magazine creel and configure and this eyeglass holding frame is moved by self rotation along optical axis direction, and will come from the driving force of this drive source to the reducing gear of this cam canister transmission, this reducing gear includes: driving force input axial region, and it has the automatic focusing driving force input part that acceptance comes from the driving force of drive source, first order angular contact bearing, its distolateral running through with this driving force input axial region inserts and is fixed on the inboard of inner ring, and be fixed with and this inner ring between the outer ring of clamping ball, second level angular contact bearing, it has inner ring and outer ring, this inner ring inserts distolateral running through of another of this driving force input axial region and be fixed in the inboard of inner ring, and transmit focusing driving force automatically, clamping ball between this outer ring and this inner ring, and transmission is based on the manual focus driving force of cameraman's operation, angular contact bearing is pressed pressure ring, and it is fixed on the outer ring of this second level angular contact bearing, and is provided with manual focus driving force input part, bearing housing, its outer ring with this first order angular contact bearing is fixing directly or indirectly, and, being configured with the state of this angular contact bearing by the pressure ring rubbing contact, and be equipped with this driving force input axial region, this first order angular contact bearing, this second level angular contact bearing, and driving force output axial region, its for the rotary driving force that will transmit from this second level angular contact bearing to the cam canister transmission, with the ball of this second level angular contact bearing is combined with the retainer that rotation mode freely supports, and be fixed in mode that can synchronous rotary on the turning axle of this second level angular contact bearing, when automatic focus operation, the driving force that comes from drive source that is passed to this driving force input axial region is passed to the inner ring of this second level angular contact bearing, at this moment this angular contact bearing is kept bonding state by pressure ring and this bearing housing based on friction force, the inner ring synchronous rotary of this driving force output axial region and this second level angular contact bearing, the slip of eyeglass holding frame is mobile focuses thereby make, when manual focus moves, the driving force of transmitting by cameraman's operation is passed to this angular contact bearing by the manual focus of pressure ring driving force input part, at this moment utilize the driving force of transmitting by cameraman's operation, this angular contact bearing is disengaged by the bonding state based on friction force of pressure ring and this bearing housing, the outer ring synchronous rotary of this driving force output axial region and this second level angular contact bearing, the slip of eyeglass holding frame is mobile focuses thereby make.

In addition, the eyeglass driving mechanism of the second embodiment of the present invention, preferred described drive source is the DC motor, described reducing gear is fixed on gear on worm on the output rotating shaft of this DC motor and includes the engaging structure of this gear on worm and worm-gear toothing.

in addition, in the eyeglass driving mechanism of the second embodiment of the present invention, preferred described driving force input axial region arranges the worm-gear toothing that is meshed with gear on worm on the output rotating shaft that is fixed on described DC motor at the position of the regulation of its periphery, described first order angular contact bearing utilize elastic component with a distolateral outer ring to another distolateral pressing, and the inner ring that another is distolateral is to distolateral pressing, thereby the ball clamping, utilizing this inner ring that driving force is inputted axial region is supporting in the mode that can rotate, described second level angular contact bearing utilize elastic component with a distolateral outer ring to another distolateral pressing, and the inner ring that another is distolateral is to distolateral pressing, thereby the ball clamping, this outer ring and described bearing housing press pressure ring via described angular contact bearing and frictional engagement together, in the situation that this angular contact bearing by the frictional engagement power of pressure ring and this bearing housing greater than the frictional engagement power of setting in this eyeglass driving mechanism, this angular contact bearing is maintained by the bonding state of pressure ring and this bearing housing, normally carry out automatic focus operation, in the situation that this angular contact bearing by the frictional engagement power of pressure ring and this bearing housing less than the frictional engagement power of setting in this eyeglass driving mechanism, the outer ring rotation of this second level angular contact bearing, normally carry out the manual focus action.

In addition, in the eyeglass driving mechanism of the second embodiment of the present invention, preferred described reducing gear also comprises the angular contact bearing pressing member that supports described first order angular contact bearing, and this angular contact bearing pressing member is fixed in mode that can the shift position with respect to described bearing housing in the mode of the elastic force that can adjust described elastic component.

In addition, in the eyeglass driving mechanism of the second embodiment of the present invention, preferred described elastic component is disk spring.

In addition, the eyeglass driving mechanism of the second embodiment of the present invention, preferably coating moment of torsion oil on the slipping plane of the ball of described first order angular contact bearing and described second level angular contact bearing.

In addition, the eyeglass driving mechanism of the second embodiment of the present invention preferably has: the focusing gear, and it is meshed with being fixed on the gear that described driving force exports on axial region, and is rotated centered by optical axis; And arm member, one is distolateral to combine with this focusing gear, and the jut of another distolateral periphery with being arranged at described cam canister combines; Make focus lens is slided along optical axis direction mobile when, make the cam canister rotation from the driving force that is fixed on the gear transmission on this driving force output axial region via this focusing gear and this arm member, move thereby the eyeglass holding frame is slided.

In addition, the eyeglass driving mechanism of the second embodiment of the present invention, preferably the periphery at lens barrel has: manual focus is with encircling; And the manual focus rim gear wheel, distolateral this manual focus that is embedded in of one is used the interior week of encircling, and another manual focus distolateral and that arrange in the outer ring of described second level angular contact bearing utilizes the engagement between gear with the driving force input part and combines; When the manual focus action of being undertaken by cameraman's operation, rotate with ring by operating this manual focus, the slip of eyeglass holding frame is moved focus.

The lens barrel of the second embodiment of the present invention: the lens barrel of the second embodiment of the present invention is characterised in that, has used the eyeglass driving mechanism of the second above-mentioned embodiment.

The camera head of the second embodiment of the present invention: the camera head of the second embodiment of the present invention is characterised in that, has used the lens barrel of the second above-mentioned embodiment.

The effect of invention

Eyeglass driving mechanism of the present invention in the automatic focus operation that the driving force of using drive source is carried out, can insert the cameraman and utilize the manual focus action of manually carrying out, and simplification and cost degradation that can implementation structure.Therefore, eyeglass driving mechanism of the present invention can be used in the camera head of various kinds aptly.

Description of drawings

Fig. 1 is the schematic cross sectional views that the eyeglass driving mechanism of the first embodiment of the present invention is shown.

Fig. 2 is the expansion graph of a relation of the cam canister in eyeglass driving mechanism shown in Figure 1.

Fig. 3 observes and the routine figure that the configuration of eyeglass driving mechanism in lens barrel shown in Figure 1 is shown from the image planes side.

Fig. 4 utilizes the face of the output driving shaft by eyeglass driving mechanism shown in Figure 1 to cut off the cut-open view that illustrates.

Fig. 5 is perpendicular to the output driving shaft of eyeglass driving mechanism shown in Figure 1 and passes through the cut-open view of the face of Roller Shaft.

Fig. 6 is perpendicular to the cut-open view of the output driving shaft of eyeglass driving mechanism shown in Figure 1 and the face by the angular contact ball center.

Fig. 7 is the schematic cross sectional views that the eyeglass driving mechanism of the second embodiment of the present invention is shown.

Fig. 8 observes and the routine figure that the configuration of eyeglass driving mechanism in lens barrel shown in Figure 7 is shown from the image planes side.

Fig. 9 is the expansion graph of a relation of the cam canister of eyeglass driving mechanism shown in Figure 7.

Figure 10 utilizes the face of the output driving shaft by eyeglass driving mechanism shown in Figure 7 to cut off the cut-open view that illustrates.

Figure 11 is perpendicular to the output driving shaft of eyeglass driving mechanism shown in Figure 7 and passes through the cut-open view of the face of motor output shaft.

Figure 12 is perpendicular to the cut-open view of the output driving shaft of eyeglass driving mechanism shown in Figure 7 and the face by the angular contact ball center.

Embodiment

The below uses its embodiment of description of drawings (the first embodiment, the second embodiment) for eyeglass driving mechanism of the present invention.At this, for the first embodiment of eyeglass driving mechanism of the present invention, use Fig. 1～Fig. 6 to describe, for the second embodiment of eyeglass driving mechanism of the present invention, use Fig. 7～Figure 12 to describe.In addition, in the accompanying drawing that uses below, consider the understandability of accompanying drawing, omitted eyeglass and relative member beyond focus lens.

The eyeglass driving mechanism of the first embodiment of the present invention: the eyeglass driving mechanism A of the first embodiment of the present invention has reducing gear, this reducing gear is when making mobile focusing that focus lens L is slided along optical axis O direction that is placed in via eyeglass holding frame 7 in lens barrel 12, in the automatic focus operation that the driving force of using drive source 26 is carried out, can insert the cameraman and utilize the manual focus action of manually carrying out.This reducing gear includes the combination of angular contact bearing 21 and thrust roller bearing 23.At this, the distolateral inboard that is inserted into its inner ring 21a of running through that this angular contact bearing 21 is exported axial region 30 with driving force is fixed.In addition, this thrust roller bearing 23 is to run through to insert this driving force output axial region 30 on its turning axle, and, the roller 28 that has is combined with this driving force output axial region 30 with the retainer 29 that rotating mode supports.And when automatic focus operation, the driving force that comes from drive source 26 is passed to the outer ring 21b of this angular contact bearing 21, this moment and roller 28 driven in synchronism of the thrust roller bearing 23 that rotates with roller maintaining part 23a via the automatic focusing that is connected in this outer ring 21b, make this driving force output axial region 30 rotations, from another distolateral outgoing mirror sheet driving force of this driving force output axial region 30.In addition, when manual focus moves, be passed to the manual focus roller maintaining part 23b of this thrust roller bearing 23 from the driving force of cameraman's transmission, synchronize with the roller 28 of the thrust roller bearing 23 that rotates via this roller maintaining part 23b, these driving force output axial region 30 rotations, from another distolateral outgoing mirror sheet driving force of this driving force output axial region 30, this is its feature.

As mentioned above, the eyeglass driving mechanism A of the first embodiment of the present invention is following eyeglass driving mechanism, namely, when making mobile focusing that focus lens L is slided along optical axis O direction that is placed in via eyeglass holding frame 7 in lens barrel 12, in the automatic focus operation that the driving force of using drive source 26 is carried out, can insert the cameraman and utilize the manual focus action of manually carrying out.And the eyeglass driving mechanism A of the first embodiment of the present invention is due to the cam canister 1 that has stationary magazine creel 5 and run through that the periphery that is inserted into this stationary magazine creel 5 configures and this eyeglass holding frame 7 is moved by self rotation along optical axis O direction, also have the combination of angular contact bearing 21 and thrust roller bearing 23 as the reducing gear of the driving force that will come from this drive source 26 to this cam canister 1 transmission, be difficult to produce loss in the transmission of driving force.Below the eyeglass driving mechanism A of relevant the first embodiment of the present invention, more specifically and at length describe.

As shown in Figure 1, eyeglass holding frame 7 is the lens frame that have focus lens L, in its periphery, the protuberance 8 at three positions waits configuration to arrange with 120 degree respectively, cam rollers 8a is inserted on this protuberance 8, and connect the cam slot 1a that directly advances cam slot 5a and cam canister 1 of stationary magazine creel 5, be held at the internal diameter of this stationary magazine creel 5.In addition, this stationary magazine creel 5 is provided with protuberance 6 in its periphery, is inserted into cam rollers 6a on this protuberance 6 and the cam slot 1a of this cam canister 1 and fastens, and this cam canister 1 rotates in the fixed position with respect to optical axis O direction in the scope of this cam slot 1a.And be subject to coming from the revolving force of periphery protuberance 2 and when rotating in the fixed position when this cam canister 1, by the protuberance 8 on the periphery of eyeglass holding frame 7 along cam slot 1b(with reference to figure 3) mobile, this eyeglass holding frame 7 is slided mobile along optical axis O direction.In addition, the eyeglass driving mechanism A of the first embodiment of the present invention is fixedly installed on the fixed lens barrel 11 of lens barrel 12.

And the eyeglass driving mechanism A of the first embodiment of the present invention, the reducing gear that has includes angular contact bearing 21, thrust roller bearing 23, thrust roller bearing by pressure ring 32, driving force output axial region 30.Like this, the eyeglass driving mechanism A of the first embodiment of the present invention, by use that angular contact bearing 21 and thrust roller bearing 23 are combined, can be with the contraction in length of this driving force output axial region 30 with respect to the axle Y-direction.In addition, the eyeglass driving mechanism A of the first embodiment of the present invention, because the engagement of the worm-gear toothing 24 in the outer ring 21b that has to be pressed into this angular contact bearing 21 with gear on worm 25 fixing on the output rotating shaft 27 of DC motor 26 is the reducing gear on basis and slows down as the reducing gear on basis take the planetary rollers of this thrust roller bearing 23, compare with gear row in the past and can improve quietness.

At this, the angular contact bearing 21 that the eyeglass driving mechanism A of the first embodiment of the present invention has, the automatic focusing that has the driving force of accepting to come from drive source 26 in outer ring 21b side is with driving force input part 24, and this outer ring 21b between the clamping inboard that the inner ring 21a of ball 21d run through and insert and fixed-bearing axis 22.And this ball 21d is held (with reference to Fig. 6) by retainer 21c in equally spaced mode.Namely, the angular contact bearing 21 that uses in the eyeglass driving mechanism A of the first embodiment of the present invention is so-called angular contact ball bearings, as fixed-bearing axis, the straight line that the contact of inner ring 21a, ball 21d and outer ring 21b is coupled together has certain angle (contact angle) with respect to radial direction with its inner ring 21a.Therefore, angular contact bearing 21 of the present invention, the driving force that will come from drive source 26 is passed to outer ring 21b, makes this outer ring 21b rotate.

In addition, this thrust roller bearing 23 has: the first roller maintaining part 23a, and it is provided with the automatic focusing driving force input part 24 that transmits the rotary driving force that comes from this angular contact bearing 21; The second roller maintaining part 23b, it is provided with via the manual focus driving force input part 34 of roller 28 transmission based on the driving force of cameraman's operation.At this, this roller 28 is configured to circular etc. (with reference to Fig. 5) by retainer 29 between this first roller maintaining part 23a of thrust roller bearing 23 and this second roller maintaining part 23b.In addition, the thrust roller of this thrust roller bearing 23 keeps face 23a1 perpendicular to the turning axle of the first member 23a, and thrust roller keeps face 23b1 perpendicular to the turning axle of second component 23b, and this roller 28 is able to successfully rotation thus.

In addition, this thrust roller bearing is pressed pressure ring 32, for the stably clamping of roller 28 with this thrust roller bearing 23, via elastic component 33, this second roller maintaining part 23b being pressed to this first roller maintaining part 23a side, and with the state configuration of this second roller maintaining part 23b rubbing contact.Consequently, the first roller maintaining part 23a and the second roller maintaining part 23b rubbing contact of this roller 28 and this thrust roller bearing 23 by the rotation of this roller 28, make the first roller maintaining part 23a or the second roller maintaining part 23b rotate.

In addition, driving force output axial region 30 of the present invention for the rotary driving force that will come from this thrust roller bearing 23 transmits to cam canister 1, but is fixed on the turning axle of this thrust roller bearing 23 in the mode of synchronous rotary.At this moment, this driving force output axial region 30 is supported distolateral running through in the bolster 22 that is inserted into this angular contact bearing 21 of supporting and in rotation mode freely of one, thus, this driving force output axial region 30 is rotated under stable state.

The eyeglass driving mechanism A of the first embodiment of the present invention, when automatic focus operation, the driving force that comes from drive source 26 that is passed to angular contact bearing 21 is passed to the first roller maintaining part 23a of thrust roller bearing 23, at this moment the second roller maintaining part 23b and thrust roller bearing are kept bonding state by pressure ring 32 based on friction force, the first roller maintaining part 23a synchronous rotary of driving force output axial region 30 and this thrust roller bearing 23 is focused thereby make eyeglass holding frame 7 slide to move.In addition, the eyeglass driving mechanism A of the first embodiment of the present invention, when manual focus moves, be passed to the manual focus driving force input part 34 of this thrust roller bearing 23 from the driving force of cameraman's transmission, at this moment utilize from the driving force of cameraman's transmission this second roller maintaining part 23b and this thrust roller bearing are removed by the bonding state based on friction force of pressure ring 32, the second roller maintaining part 23b synchronous rotary of this driving force output axial region 30 and this thrust roller bearing 23 is focused thereby make eyeglass holding frame 7 slide to move.

The eyeglass driving mechanism A of the first embodiment of the present invention as mentioned above, by adopting the combination as angular contact bearing 21 with the thrust roller bearing 23 of general articles for use, except making maintaining becomes easily, can also reduce cost of products.In addition, the eyeglass driving mechanism A of the first embodiment of the present invention, as mentioned above, press maintenance or the releasing based on the bonding state of friction force of pressure ring 32 due to the second roller maintaining part 23b by thrust roller bearing 23 and this thrust roller bearing, carry out the switching of automatic focus operation and manual focus action, therefore the driving force based on the manual focus action only is passed to focus lens, can carry out safely eyeglass and drive.In addition, the eyeglass driving mechanism A of first embodiment of the invention can prevent from making owing to applying excessive load the situation that the parts of focus lens is produced damage that drives.

In addition, the eyeglass driving mechanism A of the first embodiment of the present invention, preferred motive source 26 is DC motors, reducing gear is fixed on gear on worm 25 on the output rotating shaft 27 of this DC motor and includes the engaging structure of this gear on worm 25 and worm-gear toothing 24.

The eyeglass driving mechanism A of the first embodiment of the present invention, can adopt on the output rotating shaft 27 of DC motor 26 fixing gear on worm 25 and with the structure of worm-gear toothing 24 engagements.The eyeglass driving mechanism A of the first embodiment of the present invention, by the structure that adopts gear on worm 25 and worm-gear toothing 24 to mesh, thereby be set as the condition of self-locking of this gear on worm 25 and worm-gear toothing 24, even therefore the power of the revolving force of the output rotating shaft 27 of this DC motor 26 of hypothesis opposing is passed to this worm-gear toothing 24, can not be passed to this output rotating shaft 27 yet, can prevent the damage of this DC motor 26.In addition, in Fig. 4, DC motor 26 is fixed on the motor installed surface 20a(of the casing 20 parallel with the axle Y of driving force output axial region 30 with reference to Fig. 6 by screw threads for fastening) on.In addition, thrust roller bearing is mounted by screw threads for fastening by the installation threaded portion 20b of pressure ring 32 at casing 20.

In addition, the eyeglass driving mechanism A of the first embodiment of the present invention, preferably constitute arrange on the 21b of the outer ring of angular contact bearing 21 with the output rotating shaft 27 that is fixed on DC motor 26 on the structure of worm-gear toothing 24 of gear on worm 25 engagements.Like this, the eyeglass driving mechanism A of the first embodiment of the present invention, by on the 21b of the outer ring of angular contact bearing 21, worm-gear toothing 24 being set, be meshed with the gear on worm 25 on the output rotating shaft 27 that is fixed on DC motor 26, form thus the auto-lock function of wanting required for the present invention, and can access large reduction gear ratio.In addition, the eyeglass driving mechanism A of first embodiment of the invention by adopting the friction-driven based on planetary rollers, can realize the miniaturization of eyeglass driving mechanism and quietization when driving.

In addition, in the eyeglass driving mechanism A of the first embodiment of the present invention, the roller 28 of thrust roller bearing 23 combines with the retainer 29 that the mode of rotating freely supports this roller 28 by consisting of more than three with driving force output axial region 30.In addition, the first roller maintaining part 23a of thrust roller bearing 23 of the present invention is circular plate shape, combines with the outer ring 21b of angular contact bearing 21.In addition, the second roller maintaining part 23b of thrust roller bearing 23 of the present invention is the shape that combines the cylinder that can run through this driving force output axial region 30 of insertion on the circular plate, between this circular slab shape part and thrust roller bearing are by pressure ring 32, check washer 33 is set, the manual focus of the second roller maintaining part 23b opposing face 23b2 with the thrust roller maintenance face 23b1 of driving force input part side is pressed to the first roller maintaining part 23a side.In addition, in Fig. 4, show the periphery of this barrel shape section and the position that this thrust roller bearing represents with 32a in Fig. 4 by pressure ring 32() by friction force and the structure of combination.In addition in Fig. 4, show the structure that this driving force output axial region 30 is supported by the internal diameter 23b3 of the barrel of this second roller maintaining part 23b in the mode that can rotate freely, by constituting such structure, this driving force output axial region 30 is stably rotated.

Like this, the eyeglass driving mechanism A of the first embodiment of the present invention by adopting the combination of angular contact bearing 21 and thrust roller bearing 23, can shorten the length of this driving force output axial region 30 on the axle Y-direction.In addition, by check washer 33 is set, the contact grow of the roller 28 of thrust roller bearing 23 when rotating can transmit the friction transmission of drive force of this thrust roller bearing 23 reliably.In addition, the eyeglass driving mechanism A of the first embodiment of the present invention as the substitute of check washer 33, so long as the member of thrust roller bearing 23 operating stablies is got final product, also can use the O-ring seals of saucer washer, rubber system etc.

By having the structure shown in above, the eyeglass driving mechanism A of the first embodiment of the present invention, in the situation that the second roller maintaining part 23b and thrust roller bearing by the frictional engagement power of pressure ring 32 greater than the frictional engagement power of setting in this eyeglass driving mechanism A, keep this second roller maintaining part 23b and this thrust roller bearing by the bonding state of pressure ring 32, can normally carry out automatic focus operation.In addition, the eyeglass driving mechanism A of the first embodiment of the present invention, in the situation that this second roller maintaining part 23b and this thrust roller bearing by the frictional engagement power of pressure ring 32 less than the frictional engagement power of setting in this eyeglass driving mechanism A, this the second roller maintaining part 23b rotation, the manual focus action can normally be carried out.Like this, the eyeglass driving mechanism A of the first embodiment of the present invention, the friction force of effect between pressure ring 32 is pressed in utilization at this second roller maintaining part 23b and this thrust roller bearing, even in carrying out the process of automatic focus operation, need not insert special blocked operation, can be roughly continuous in focus lens L being carried out the manual focus action.In addition, the eyeglass driving mechanism A of the first embodiment of the present invention, can not be passed to because of the driving force that manual focus action will depart from allowed band becomes the DC of drive source motor 26.Therefore, the eyeglass driving mechanism A of the first embodiment of the present invention can in order not transmit excessive driving force and to use in addition special product etc. and can not increase number of components to motor, can not realize miniaturization and in the situation that be used for camera head.

In addition, in the eyeglass driving mechanism A of the first embodiment of the present invention, preferred thrust roller bearing 23 applies moment of torsion oil on the slipping plane of roller 28.

The roller 28 of the thrust roller bearing 23 that uses in the eyeglass driving mechanism A of the first embodiment of the present invention uses the manual focus of driving force input part 23a1 and the second roller maintaining part 23b to export the revolution on every side of the axle Y of axial region 30 on one side round driving force with the state rotation on one side with rubbing contact between driving force input part 23b1 in the automatic focusing of the first roller maintaining part 23a.Therefore, if this thrust roller bearing 23 coating moment of torsion oil on the slipping plane of roller 28, rising that can Yin Wendu and produce and burn phenomenon etc. if things go on like this makes the difficulty that becomes smoothly of automatic focus operation and manual focus action.In addition, moment of torsion oil also can be coated on the slipping plane of ball 21d of angular contact bearing 21, the bearing that is rolling thus can not loss of function and will come from driving force good the transmitting to cam canister 1 of efficient more of drive source, and can improve the permanance of eyeglass driving mechanism A.In addition, the moment of torsion oil that uses in the present invention can use suitable type according to the condition of the temperature of the bearing that is rolling, rotational speed, load etc.

In addition, the eyeglass driving mechanism A of the first embodiment of the present invention can have: focusing gear 3, and it is meshed with being fixed on the gear 31 that driving force exports on axial region 30, and is rotated centered by optical axis; Arm member 4, one is distolateral to combine with this focusing gear 3, and the jut 2 on another distolateral periphery with being arranged on cam canister 1 combines.And make focus lens L is slided along optical axis O direction mobile when, preferably transmit the driving force come and make cam canister 1 rotation via this focusing gear 3 and this arm member 4 from being fixed on gear 31 on this driving force output axial region 30, eyeglass holding frame 7 is slided move.

The eyeglass driving mechanism A of the first embodiment of the present invention can set the shape of arm member 4, therefore applicable to all camera heads corresponding to the configuration of each component parts in the shape of the lens barrel 12 of using, this lens barrel 12 etc.

In addition, the eyeglass driving mechanism A of the first embodiment of the present invention, can have in the periphery of lens barrel 12 manual focus ring 9 and manual focus rim gear wheel 10, manual focus is embedded in this manual focus with the interior week of ring 9 with a distolateral 10a of rim gear wheel 10, its another distolateral and be pressed into the rotary shaft 23b4 of the second roller maintaining part 23b that is embedded in thrust roller bearing 23 and the manual focus that arranges combines by the engagement between gear with driving force input part 34.Thereby the eyeglass driving mechanism A of the first embodiment of the present invention when the action of the manual focus that undertaken by the cameraman, preferably rotates with ring 9 eyeglass holding frame 7 movements of sliding is focused by operating this manual focus.

The eyeglass driving mechanism A of the first embodiment of the present invention uses the shirtsleeve operation of ring 9 by the manual focus that only rotates the periphery that is arranged on lens barrel 12, just can insert the manual focus action in the process of carrying out automatic focus operation.Therefore, the eyeglass driving mechanism A of first embodiment of the invention can make the beginning of manual focus action rapid, and, sight is left, the photography under the opportunity of can realizing ideal from the photographic image of view finder etc.

The lens barrel of the first embodiment of the present invention: the feature of the lens barrel 12 of the first embodiment of the present invention is to have used the eyeglass driving mechanism A of above-mentioned the first embodiment of the present invention.

The lens barrel 12 of first embodiment of the invention, by using the eyeglass driving mechanism A of above-mentioned the first embodiment of the present invention, even in carrying out the process of automatic focus operation, also can not insert special blocked operation and roughly continuous in focus lens L being carried out the manual focus action, and can cheap price provide high-quality autofocus lens lens barrel.

The camera head of the first embodiment of the present invention: the feature of the camera head of the first embodiment of the present invention is to have used the lens barrel 12 of above-mentioned the first embodiment of the present invention.

The camera head of first embodiment of the invention (not shown) can be realized miniaturization, the camera head that the eyeglass mobile accuracy is good and quietness is good by using the lens barrel 12 of above-mentioned the first embodiment of the present invention, can providing.

The eyeglass driving mechanism of the second embodiment of the present invention: the eyeglass driving mechanism B of the second embodiment of the present invention has following reducing gear: slide mobile and when focusing to focus lens L along optical axis O direction in lens barrel 62 making via eyeglass holding frame 57 to be placed in, in the automatic focus operation that the driving force of using drive source is carried out, can insert the cameraman and utilize the manual focus action of manually carrying out.This reducing gear includes the combination of first order angular contact bearing 71 and second level angular contact bearing 73.At this, distolateral the running through that axial region 72 is inputted with driving force in the inboard that this first order angular contact bearing 71 encloses 71a within it inserts and fixes.In addition, the inboard that this second level angular contact bearing 73 encloses 73a is within it inputted distolateral running through of another of axial region 72 with driving force and is inserted and fix, and, the retainer 73c that the ball 73d that has is supported in rotation mode freely and distolateral combining of driving force output axial region 80, but this driving force is exported axial region 80 and is configured to and these second level angular contact bearing 73 synchronous rotaries.Thereby when automatic focus operation, driving force from drive source 76 is passed to this driving force input axial region 72, at this moment synchronize with the ball 73d that rotates via the inner ring 73a of this second level angular contact bearing 73 that is connected in this driving force input axial region 72, these driving force output axial region 80 rotations are from another distolateral outgoing mirror sheet driving force of this driving force output axial region 80.In addition, when manual focus moves, be passed to the outer ring 73b of this second level angular contact bearing 73 by the driving force of cameraman's transmission, at this moment synchronize with the ball 73d that rotates via this outer ring 73b, these driving force output axial region 80 rotations, from another distolateral outgoing mirror sheet driving force of this driving force output axial region 80, this is its feature.

As mentioned above, the eyeglass driving mechanism B of the second embodiment of the present invention is following eyeglass driving mechanism: when making mobile focusing that focus lens L is slided along optical axis O direction that is placed in via eyeglass holding frame 57 in lens barrel 62, in the automatic focus operation that the driving force of using drive source 76 is carried out, can insert the cameraman and utilize the manual focus action of manually carrying out.And the eyeglass driving mechanism B of the second embodiment of the present invention, have stationary magazine creel 55 and run through the periphery that is inserted in this stationary magazine creel 55 and the cam canister 51 that configures and this eyeglass holding frame 57 is moved by self rotation along optical axis O direction, as transmit the reducing gear of the driving force that comes from this drive source 76 to this cam canister 51, have the combination of first order angular contact bearing 71 and second level angular contact bearing 73, be difficult to produce thus loss in the transmission of driving force.Below the eyeglass driving mechanism B of relevant the second embodiment of the present invention, more specifically and at length describe.

As shown in Figure 7, eyeglass holding frame 57 is the lens frame that have focus lens L, in its periphery, the protuberance 58 at three positions arranges in the mode of the configurations such as 120 degree respectively, insert cam rollers 58a on this protuberance 58, cam rollers 58a connects the cam slot 51b that directly advances cam slot 55a and cam canister 51 of stationary magazine creel 55, and is held at the internal diameter of this stationary magazine creel 55.In addition, this stationary magazine creel 55 arranges protuberance 56 in its periphery, and the cam rollers 56a that is inserted in this protuberance 56 engages with the cam slot 51a of this cam canister 51, and this cam canister 51 is rotated in the fixed position with respect to optical axis O direction in the scope of this cam slot 51a.And when this cam canister 51 is subject to coming from the revolving force of periphery jut 52 and is rotated in the fixed position, protuberance 58 on the periphery of eyeglass holding frame 57 along cam slot 51b(with reference to Fig. 9) mobile, mobile thereby this eyeglass holding frame 57 is slided along optical axis O direction.In addition, the eyeglass driving mechanism B of the second embodiment of the present invention is fixedly mounted on the fixed lens barrel 61 of lens barrel 62.

The reducing gear that the eyeglass driving mechanism B of the second embodiment of the present invention has includes driving force input axial region 72, first order angular contact bearing 71, second level angular contact bearing 73, angular contact bearing by pressure ring 83, bearing housing 84, driving force output axial region 80.Like this, the eyeglass driving mechanism B of the second embodiment of the present invention by use that first order angular contact bearing 71 and second level angular contact bearing 73 are combined, can shorten this driving force output axial region 80 width diametrically.In addition, the eyeglass driving mechanism B of the second embodiment of the present invention, by having engagement take gear on worm 75 fixing on the worm-gear toothing 74 of the periphery setting of this driving force input axial region 72 and output rotating shaft 77 at DC motor 76 as the reducing gear on basis and slowing down as the reducing gear on basis take the planetary rollers of this second level angular contact bearing 73, compare with gear row in the past and can improve quietness.

At this, driving force that the eyeglass driving mechanism B of the second embodiment of the present invention has input axial region 72, the automatic focusing with driving force of accepting to come from drive source 76 is with driving force input part 74.Thus, driving force of the present invention input axial region 72 driving force that will come from drive source 76 is passed to periphery and rotates.

In addition, the first order angular contact bearing 71 that the eyeglass driving mechanism B of the second embodiment of the present invention has, and outer ring 71b between the clamping inboard that the inner ring 71a of ball 71d run through and insert the distolateral and fixing of driving force input axial region 72.And this ball 71d is held (with reference to Figure 12) by retainer 71c in equally spaced mode.That is, the first order angular contact bearing 71 that uses of the eyeglass driving mechanism B of the second embodiment of the present invention is that the straight line that the contact with inner ring 71a, ball 71d and outer ring 71b couples together has the so-called angular contact ball bearing of certain angle (contact angle) with respect to radial direction.Thus, angular contact bearing 71 of the present invention is passed to inner ring 71a via the driving force that this driving force input axial region 72 will come from drive source 76, and this inner ring 71a is synchronizeed and rotates with this driving force input axial region 72.

In addition, the second level angular contact bearing 73 that the eyeglass driving mechanism B of the second embodiment of the present invention has, and outer ring 73b between to run through another that insert driving force input axial region 72 distolateral and fixing the clamping inboard that the inner ring 73a of ball 73d.And this ball 73d is held (with reference to Figure 12) by retainer 73c in equally spaced mode.Namely, the second level angular contact bearing 73 that the eyeglass driving mechanism B of the second embodiment of the present invention uses is identical with first order angular contact bearing 71, is that the straight line that the contact with inner ring 73a, ball 73d and outer ring 73b couples together has the so-called angular contact ball bearing of certain angle (contact angle) with respect to radial direction.The second level of the present invention angular contact bearing 73 will automatically be focused and will be passed to inner ring 73a with driving force, be passed to outer ring 73b based on the manual focus of cameraman's operation with driving force.Consequently, the eyeglass driving mechanism B of the second embodiment of the present invention, in the situation that this inner ring 73a rotates and transmits focusing automatically and use driving force, in the situation that this outer ring 73b rotates transmission manual focus driving force.

In addition, angular contact bearing of the present invention is fixed on the outer ring 73b of second level angular contact bearing 73 by pressure ring 83, and is provided with manual focus driving force input part 85.This angular contact bearing is fixed on the outer ring 73b of second level angular contact bearing 73 by pressure ring 83, transmitting manual focus with when driving force from manual focus with driving force input part 85, the ball 73d of this second level angular contact bearing 73 and retainer 73c are synchronizeed and are rotated with this outer ring 73b.

In addition, the accommodating driving force input of bearing housing 84 of the present invention axial region 72, first order angular contact bearing 71, second level angular contact bearing 73.And bearing housing 84 of the present invention is direct or indirectly fixing with the outer ring 71b of first order angular contact bearing 71, and, to be configured with the state of angular contact bearing by pressure ring 83 rubbing contact.At this, in the situation that the outer ring 71b of this first order angular contact bearing is fixed on bearing housing 84, directly can adopt the method such as be pressed into, bonding with respect to this bearing housing 84 fixedly the time, indirectly can adopt the method for between this bearing housing 84 and this outer ring 71b insertion elastic component 70b etc. fixedly the time.Therefore, the eyeglass driving mechanism B of the second embodiment of the present invention, only inner ring 71a is rotatable in first order angular contact bearing 71, and in second level angular contact bearing 73 inner ring 73a or outer ring 73b all rotatable.

In addition, driving force output axial region 80 of the present invention, in order will to transmit to cam canister 51 from the rotary driving force that second level angular contact bearing 73 transmits, but be combined with the end of the retainer 73c that the ball 73d of this second level angular contact bearing 73 is supported in rotation mode freely and on the turning axle of this second level angular contact bearing the mode with synchronous rotary be fixed.That is, driving force output axial region 80 of the present invention is synchronizeed and rotates with the ball 73d of second level angular contact bearing 73.At this moment, this driving force output axial region 80 is supported in angular contact bearing by the part of the 83a in pressure ring 83(Figure 10 in rotation mode freely) on, thereby this driving force output axial region 80 is rotated with stable state.

The eyeglass driving mechanism B of the second embodiment of the present invention, when automatic focus operation, the driving force that comes from drive source 76 that is passed to driving force input axial region 72 is passed to the inner ring 73a of second level angular contact bearing 73, at this moment this angular contact bearing that is fixed on the outer ring 73b of this second level angular contact bearing 73 is kept bonding state by pressure ring 83 and this bearing housing 84 based on friction force, the inner ring 73a synchronous rotary of this driving force output axial region 80 and this second level angular contact bearing is focused thereby make eyeglass holding frame 57 slide to move.in addition, the eyeglass driving mechanism B of the second embodiment of the present invention, when manual focus moves, the driving force of transmitting by cameraman's operation is passed to this angular contact bearing by the manual focus driving force input part 85 of pressure ring 83, this angular contact bearing that at this moment will be fixed on the outer ring 73b of this second level angular contact bearing 73 by the driving force of being transmitted by cameraman's operation is removed by pressure ring 83 and the bonding state based on friction force of this bearing housing 84, the outer ring 73b synchronous rotary of this driving force output axial region 80 and this second level angular contact bearing, thereby making eyeglass holding frame 57 slide to move focuses.

The eyeglass driving mechanism B of the second embodiment of the present invention as mentioned above, by adopting as the angular contact bearing 71 of general articles for use, 73 combination, except maintaining becomes easily, can also reduce cost of products.In addition, the eyeglass driving mechanism B of the second embodiment of the present invention, as mentioned above, press maintenance or the releasing based on the bonding state of friction force of pressure ring 83 and this bearing housing 84 by this angular contact bearing fixing on the 73b of the outer ring of this second level angular contact bearing 73, carry out the switching of automatic focus operation and manual focus action, therefore the driving force of manual focus action only is passed to focus lens, can carry out safely lens driving.In addition, eyeglass driving mechanism B second embodiment of the invention can prevent from making because applying excessive load the situation that the parts of focus lens are occured in damage that drives.

In addition, the eyeglass driving mechanism B of the second embodiment of the present invention, preferred motive source 76 is DC motors, reducing gear is fixed on gear on worm 75 on the output rotating shaft 77 of this DC motor and includes the engaging structure of this gear on worm 75 and worm-gear toothing 74.

The eyeglass driving mechanism B of the second embodiment of the present invention, by adopt on the output rotating shaft 77 of DC motor 76 fixing gear on worm 75 and with the structure of worm-gear toothing 74 engagements, thereby be set as the condition of self-locking of this gear on worm 75 and worm-gear toothing 74, even the power of the revolving force of the output rotating shaft 77 of this DC motor 76 of hypothesis opposing is passed to this worm-gear toothing 74 thus, do not transmit anti-driving force to this output rotating shaft 77 yet, can prevent the damage of this DC motor 76.In addition, as Figure 11 and shown in Figure 12, DC motor 76 is fixed on by screw threads for fastening on the motor installed surface 70a of motor mounting plate 78, by this motor mounting plate 78 with casing 70 by screw threads for fastening, eyeglass driving mechanism B is installed in the position of regulation.In addition, as Figure 10～shown in Figure 12, the bearing housing 84 of the reducing gear that is pressed into first order angular contact bearing 71, second level angular contact bearing 73 etc. in this casing 70 accommodating, and also accommodating this worm-gear toothing 74, this gear on worm 75.

In addition, the eyeglass driving mechanism B of the second embodiment of the present invention, preferably constitute periphery at driving force input axial region 72 be provided with the output rotating shaft 77 that is fixed on DC motor 76 on the structure of worm-gear toothing 74 of gear on worm 75 engagements.Like this, the eyeglass driving mechanism B of the second embodiment of the present invention, by the periphery at driving force input axial region 72, worm-gear toothing 74 is set, and be meshed with the gear on worm 75 on the output rotating shaft 77 that is fixed on DC motor 76, thereby form the auto-lock function that the present invention needs, and can obtain large reduction gear ratio.In addition, eyeglass driving mechanism B second embodiment of the invention by adopting the friction-driven based on planetary rollers, can realize the miniaturization of eyeglass driving mechanism and quietization when driving.In addition, as shown in figure 10, this worm-gear toothing 74 is arranged on the position between the first order angular contact bearing 71 of driving force input axial region 72 and position that second level angular contact bearing 73 configures, thereby can make the rotational action of this driving force input axial region 72 more stable.

In addition, in the eyeglass driving mechanism B of the second embodiment of the present invention, first order angular contact bearing 71 by elastic component 79 with a distolateral outer ring 71b towards another distolateral pressing, and the inner ring 71a that another is distolateral is towards distolateral pressing, thereby ball 71d clamping.In addition, about second level angular contact bearing 73 be also by elastic component 79 with a distolateral outer ring 73b towards another distolateral pressing, and the inner ring 73a that another is distolateral is towards distolateral pressing, thereby ball 73d clamping.Like this, the eyeglass driving mechanism B of the second embodiment of the present invention, by elastic component 79 is set, contact force grow when making the rotation of ball 71d, 73d of first order angular contact bearing 71 and second level angular contact bearing 73 can make the driving force that is passed to this second level angular contact bearing 73 have no loss ground towards the outgoing side transmission.And this first order angular contact bearing 71 is inputted axial region 72 by its inner ring 71a with driving force and is being supported in rotating mode.This driving force input axial region 72 is being by supporting the distolateral first order angular contact bearing 71 that utilizes of one, thereby can stably rotate.In addition, the outer ring 73b of this second level angular contact bearing 73 presses pressure ring 83 and bearing housing 84 frictional engagement via angular contact bearing.

By having the structure shown in above, the eyeglass driving mechanism B of the second embodiment of the present invention, in the situation that be fixed in this angular contact bearing on the outer ring 73b of second level angular contact bearing by the frictional engagement power of pressure ring 83 and this bearing housing 84 greater than the frictional engagement power of setting in this eyeglass driving mechanism B, keep this angular contact bearing by the bonding state of pressure ring 83 with this bearing housing 84, can normally carry out automatic focus operation.At this moment, rotate the driving force output axial region 80 and this inner ring 73a synchronous rotary that combine with the retainer 73c of this ball of supporting 73d together with the inner ring 73a of ball 73d and this second level angular contact bearing.In addition, the eyeglass driving mechanism B of the second embodiment of the present invention, in the situation that be fixed in this angular contact bearing on the outer ring 73b of this second level angular contact bearing by the frictional engagement power of pressure ring 83 and this bearing housing 84 less than the frictional engagement power of setting in this eyeglass driving mechanism, the manual focus action can be normally carried out in the outer ring 73b rotation of this second level angular contact bearing.At this moment, rotate the driving force output axial region 80 and this outer ring 73b synchronous rotary that combine with the retainer 73c of this ball of supporting 73d together with the outer ring 73b of ball 73d and this second level angular contact bearing.

Like this, the eyeglass driving mechanism B of the second embodiment of the present invention, utilization be fixed in this angular contact bearing on the outer ring 73b of this second level angular contact bearing by pressure ring 83 and this bearing housing 84 between the friction force of effect, even in carrying out the process of automatic focus operation, need not insert special blocked operation, just can be roughly continuously to focus lens L being carried out the manual focus action.In addition, the eyeglass driving mechanism B of the second embodiment of the present invention, the driving force that departs from allowed band due to the manual focus action can be passed to becomes the DC of drive source motor 76.Therefore, the eyeglass driving mechanism B of the second embodiment of the present invention can in order not transmit excessive driving force and to use in addition special product etc. and can not increase number of components to motor, can not realize miniaturization and in the situation that be used for camera head.

In addition, the reducing gear of the eyeglass driving mechanism B of the second embodiment of the present invention can also comprise the angular contact bearing pressing member 82 of supporting first order angular contact bearing 71.By using this angular contact bearing pressing member 82, can more stably support this first order angular contact bearing 71, can make the rotation of ball 71d of this first order angular contact bearing more stable.And angular contact bearing pressing member 82 preferably can be adjusted the elastic force be used to the elastic component 79 of the outer ring 71b, the 73b that press this first order angular contact bearing and second level angular contact bearing by mobile fixed position.For example, implement screw thread processing in the part of the inner peripheral surface of bearing housing 84, for can be with these bearing housing 84 screw threads for fastening in the situation that also implement screw thread processing on the part of the outer peripheral face of angular contact bearing pressing member 82, by adjusting the amount of tightening of this angular contact bearing pressing member 82, the elastic force of capable of regulating elastic component 79.Therefore, the eyeglass driving mechanism B of the second embodiment of the present invention, by using angular contact bearing pressing member 82, regardless of the kind of elastic component 79, the action of the contact force when all making the rotation of ball 71d, 73d of suitable correction first order angular contact bearing 71 and second level angular contact bearing 73 becomes easy.

In addition, in the eyeglass driving mechanism B of the second embodiment of the present invention, preferred elastomeric member 79 is disk spring.

The eyeglass driving mechanism B of the second embodiment of the present invention by adopting disk spring as elastic component 79, can only press angular contact bearing 71,73 inner ring 71a, 73a reliably, perhaps only presses outer ring 71b, 73b.In addition, this elastic component 79 also can use the O-ring seals of rubber system etc. aptly except disk spring.And, figure 10 illustrates following structure: used disk spring as elastic component 79, one distolateral outer ring 71b of first order angular contact bearing 71 is by to another distolateral pressing, the distolateral inner ring 71a of another of this first order angular contact bearing 71 utilize with driving force input axial region 72 coaxial insertions ring 86 and to distolateral pressing.

In addition, the eyeglass driving mechanism B of the second embodiment of the present invention, preferably coating moment of torsion oil on the slipping plane of ball 71d, the 73d of first order angular contact bearing 71 and second level angular contact bearing 73.

The first order angular contact bearing 71 that uses in the eyeglass driving mechanism B of the second embodiment of the present invention and the ball 71d of second level angular contact bearing 73,73d is with the state of rubbing contact between inner ring 71a, 73a and outer ring 71b, 73b, on one side rotation revolution around the driving force input axial region 72 on one side.Therefore, if this first order angular contact bearing 71 and second level angular contact bearing 73 do not apply moment of torsion oil on the slipping plane of ball 71d, 73d, if things go on like this make the difficulty that becomes smoothly of automatic focus operation and manual focus action.In addition, by enclosing moment of torsion oil, can make the not loss of function of bearing of rolling and will come from driving force good the transmitting to cam canister 51 of efficient more of drive source, and can improve the permanance of eyeglass driving mechanism B.In addition, the moment of torsion oil that uses in the present invention can use suitable type according to the condition of the temperature of the bearing that is rolling, rotational speed, load etc.

In addition, the eyeglass driving mechanism B of the second embodiment of the present invention can have: focusing gear 53, and it is meshed with being fixed on the gear 81 that driving force exports on axial region 80, and is rotated centered by optical axis; Arm member 54, one is distolateral to combine with this focusing gear 53, and another distolateral and jut 52 in the periphery setting of cam canister 51 combines.And make focus lens L is slided along optical axis O direction mobile when, the driving force of preferably transmitting from the gear 81 that is fixed on this driving force output axial region 80 makes cam canister 51 rotations via this focusing gear 53 and this arm member 54, moves thereby eyeglass holding frame 57 is slided.

The eyeglass driving mechanism B of the second embodiment of the present invention can set the shape of arm member 54, therefore applicable to all camera heads corresponding to the configuration of each component parts in the shape of the lens barrel 62 of using, this lens barrel 62 etc.In addition, as shown in Figure 7, arm member 54 also can make its front end constitute the U word shape, and jut 52 clampings that utilize this U word shape part will be arranged on the periphery of cam canister 51.

In addition, the eyeglass driving mechanism B of the second embodiment of the present invention can have in the periphery of lens barrel 62 manual focus ring 59 and manual focus rim gear wheel 60, this manual focus is embedded in this manual focus with the interior week of ring 59 with a distolateral 60a of rim gear wheel 60, another distolateral be arranged at this angular contact bearing and utilize the engagement between gear and combine by the gear of the manual focus on pressure ring 83 with driving force input part 85.And the eyeglass driving mechanism B of the second embodiment of the present invention when the manual focus action of carrying out based on cameraman's operation, preferably rotates with ring 59 by operating this manual focus, and eyeglass holding frame 57 movements of sliding are focused.

The eyeglass driving mechanism B of the second embodiment of the present invention by only rotating the manual focus that arranges in the periphery of lens barrel 62 with the shirtsleeve operation of ring 59, just can insert manual focus and move in the process of carrying out automatic focus operation.Therefore, eyeglass driving mechanism B second embodiment of the invention can make the beginning of manual focus action rapid, and, sight is left, the photography under the opportunity of can realizing ideal from the photographic image of view finder etc.In addition, as shown in figure 10, can make angular contact bearing outstanding from bearing housing 84 by the end of pressure ring 83, manual focus is fixed and arranged at this outshot with the gear of driving force input part 85.

The lens barrel of the second embodiment of the present invention: the feature of the lens barrel 62 of the second embodiment of the present invention is to have used the eyeglass driving mechanism B of above-mentioned the second embodiment of the present invention.

Lens barrel 62 second embodiment of the invention, by using the eyeglass driving mechanism B of above-mentioned the second embodiment of the present invention, even in carrying out the process of automatic focus operation, also can not insert special blocked operation and roughly move to focus lens L being carried out manual focus continuously, and high-quality autofocus lens lens barrel can be provided with cheap price.

The camera head of the second embodiment of the present invention: the feature of the camera head of the second embodiment of the present invention is to have used the lens barrel 62 of above-mentioned the second embodiment of the present invention.

Camera head second embodiment of the invention (not shown), can realize also good camera head of miniaturization, good, the other quietness of lens moving precision by using the lens barrel 62 of above-mentioned the second embodiment of the present invention, can providing.

Utilizability on industry

According to eyeglass driving mechanism of the present invention, drive source is not limited to the high supersonic motor of price, but former state is used the DC motor of less expensive.In addition, eyeglass driving mechanism of the present invention, due to motor output shaft and the reduction gear unit output gear shaft arranged perpendicular of drive source, therefore can shorten the driver element overall dimensions, and also can not produce the position limitation with respect to optical axis direction in the whole length of camera lens.Particularly, the eyeglass driving mechanism of the first embodiment of the present invention owing to having made up the short thrust roller bearing of turning axle direction length with respect to angular contact bearing, therefore can shorten the whole length on optical axis direction.In addition, the eyeglass driving mechanism of the second embodiment of the present invention owing to having made up two short angular contact bearings of radial width, therefore can reduce the external diameter of lens barrel.As mentioned above, eyeglass driving mechanism of the present invention can be used for all lens barrel and camera heads aptly.

Claims (20)

1. eyeglass driving mechanism, the reducing gear that uses in this eyeglass driving mechanism, when making mobile focusing that focus lens is slided along optical axis direction that is placed in via the eyeglass holding frame in lens barrel, in the automatic focus operation that the driving force of using drive source is carried out, can insert the cameraman and utilize the manual focus action of manually carrying out, it is characterized in that

This reducing gear includes the combination of angular contact bearing and thrust roller bearing,

The inboard that this angular contact bearing encloses is within it run through and is inserted and fixed drive power output shaft section one distolateral,

This thrust roller bearing runs through this driving force output axial region of insertion on its turning axle, and, the roller that has is combined with this driving force output axial region with the retainer that the mode that can rotate supports,

When automatic focus operation, the driving force that comes from drive source is passed to the outer ring of this angular contact bearing, at this moment synchronize and drive with the roller of the thrust roller bearing that rotates with the roller maintaining part via the automatic focusing that is connected in this outer ring, make this driving force output axial region rotation, another distolateral outgoing mirror sheet driving force from this driving force output axial region

When manual focus moves, be passed to the manual focus roller maintaining part of this thrust roller bearing from the driving force of cameraman's transmission, synchronize with the roller of the thrust roller bearing that rotates via this roller maintaining part, this driving force output axial region rotation is from another distolateral outgoing mirror sheet driving force of this driving force output axial region.

2. eyeglass driving mechanism as claimed in claim 1, this eyeglass driving mechanism is when making mobile focusing that focus lens is slided along optical axis direction that is placed in via the eyeglass holding frame in lens barrel, in the automatic focus operation that the driving force of using drive source is carried out, can insert the cameraman and utilize the manual focus action of manually carrying out, it is characterized in that

This eyeglass driving mechanism has: stationary magazine creel; The cam canister that runs through the periphery that is inserted into this stationary magazine creel and configure and this eyeglass holding frame is moved by self rotation along optical axis direction; And will come from the driving force of this drive source to the reducing gear of this cam canister transmission;

This reducing gear includes:

Angular contact bearing, it has the automatic focusing driving force input part of the driving force of accepting to come from drive source in the outer ring side, and this outer ring between the inboard of inner ring of clamping ball run through insertion and fixed-bearing axis;

Thrust roller bearing, it has the first roller maintaining part and the second roller maintaining part, this the first roller maintaining part is provided with the automatic focusing driving force input part that transmits the rotary driving force that comes from this angular contact bearing, and this second roller maintaining part is provided with via the roller transmission based on the manual focus of the driving force of cameraman's operation driving force input part;

Thrust roller bearing is pressed pressure ring, and it is pressed this second roller maintaining part via elastic component, and be configured with the state with this second roller maintaining part rubbing contact for the roller of this thrust roller bearing of clamping stably to this first roller maintaining part side; And

Driving force output axial region, it, is fixed on the turning axle of this thrust roller bearing in mode that can synchronous rotary to the cam canister transmission for the rotary driving force that will come from this thrust roller bearing;

When automatic focus operation, the driving force that comes from drive source that is passed to this angular contact bearing is passed to the first roller maintaining part of this thrust roller bearing, at this moment this second roller maintaining part and this thrust roller bearing are pressed cyclic group and are kept bonding state in friction force, the first roller maintaining part synchronous rotary of this driving force output axial region and this thrust roller bearing, the slip of eyeglass holding frame is mobile focuses thereby make

When manual focus moves, be passed to the manual focus driving force input part of this thrust roller bearing from the driving force of cameraman's transmission, at this moment utilize the driving force of transmitting from the cameraman, this the second roller maintaining part and this thrust roller bearing are disengaged by the bonding state based on friction force of pressure ring, the second roller maintaining part synchronous rotary of this driving force output axial region and this thrust roller bearing, the slip of eyeglass holding frame is mobile focuses thereby make.

3. eyeglass driving mechanism as claimed in claim 2, it is characterized in that, the described drive source of described eyeglass driving mechanism is the DC motor, and described reducing gear is fixed on gear on worm on the output rotating shaft of this DC motor and includes the engaging structure of this gear on worm and worm-gear toothing.

4. eyeglass driving mechanism as claimed in claim 3, is characterized in that,

In described eyeglass driving mechanism, described angular contact bearing its outer ring be provided with the output rotating shaft that is fixed on described DC motor on the worm-gear toothing of gear on worm engagement,

the roller of described thrust roller bearing is by consisting of more than three, this roller is combined with described driving force output axial region with the retainer that the mode of rotating freely supports, described the first roller maintaining part is circular plate shape and combines with the outer ring of this angular contact bearing, described the second roller maintaining part is to combine to connect on the circular plate inserts the shape that this driving force is exported the cylinder of axial region, between this circular slab shape part and described thrust roller bearing are by pressure ring, check washer is set, periphery and this thrust roller bearing of this barrel shape section combine by friction force by pressure ring,

In the situation that this second roller maintaining part and this thrust roller bearing by the frictional engagement power of pressure ring greater than the frictional engagement power of setting in this eyeglass driving mechanism, this the second roller maintaining part and this thrust roller bearing are maintained by the bonding state of pressure ring, normally carry out automatic focus operation

In the situation that this second roller maintaining part and this thrust roller bearing by the frictional engagement power of pressure ring less than the frictional engagement power of setting in this eyeglass driving mechanism, the manual focus action is normally carried out in this second roller maintaining part rotation.

5. eyeglass driving mechanism as claimed in claim 1, is characterized in that, described thrust roller bearing is at the slipping plane coating moment of torsion oil of roller.

6. eyeglass driving mechanism as claimed in claim 2, is characterized in that,

Described eyeglass driving mechanism has:

The focusing gear, it is meshed with being fixed on the gear that described driving force exports on axial region, and is rotated centered by optical axis; And

Arm member, one is distolateral to combine with this focusing gear, and the jut of another distolateral periphery with being arranged at described cam canister combines;

Make focus lens is slided along optical axis direction mobile when, make the cam canister rotation from the driving force that is fixed on the gear transmission on this driving force output axial region via this focusing gear and this arm member, move thereby the eyeglass holding frame is slided.

7. eyeglass driving mechanism as claimed in claim 2, is characterized in that,

Described eyeglass driving mechanism has in the periphery of lens barrel:

Manual focus is with encircling; And

The manual focus rim gear wheel, one is distolateral is embedded in this manual focus with the interior week of ring, and another distolateral and manual focus in the second roller maintaining part setting of described thrust roller bearing utilizes the engagement between gear with the driving force input part and combines;

When the manual focus action of being undertaken by the cameraman, rotate with ring by operating this manual focus, the slip of eyeglass holding frame is moved focus.

8. a lens barrel, is characterized in that, used the described eyeglass driving mechanism of any one in claim 1～7.

9. a camera head, is characterized in that, used lens barrel claimed in claim 8.

10. eyeglass driving mechanism, the reducing gear that uses in this eyeglass driving mechanism, when making mobile focusing that focus lens is slided along optical axis direction that is placed in via the eyeglass holding frame in lens barrel, in the automatic focus operation that the driving force of using drive source is carried out, can insert the cameraman and utilize the manual focus action of manually carrying out, it is characterized in that

This reducing gear includes the combination of first order angular contact bearing and second level angular contact bearing,

The inboard that this first order angular contact bearing encloses is within it run through and is inserted and fixed drive power input axial region one distolateral,

The inboard that this second level angular contact bearing encloses is within it run through and is inserted and another of fixed drive power input axial region is distolateral, and, distolateral the combining that the retainer that the ball that has is supported in rotation mode freely and driving force are exported axial region, this driving force output axial region is being configured with the mode of this second level angular contact bearing synchronous rotary

When automatic focus operation, the driving force that comes from drive source is passed to this driving force input axial region, at this moment synchronize with the ball that rotates via the inner ring of this second level angular contact bearing that is connected in this driving force input axial region, this driving force output axial region rotation, another distolateral outgoing mirror sheet driving force from this driving force output axial region

When manual focus moves, be passed to the outer ring of this second level angular contact bearing from the driving force of cameraman's transmission, at this moment synchronize with the ball that rotates via this outer ring, this driving force output axial region rotation is from another distolateral outgoing mirror sheet driving force of this driving force output axial region.

11. eyeglass driving mechanism as claimed in claim 10, this eyeglass driving mechanism is when making mobile focusing that focus lens is slided along optical axis direction that is placed in via the eyeglass holding frame in lens barrel, in the automatic focus operation that the driving force of using drive source is carried out, can insert the cameraman and utilize the manual focus action of manually carrying out, it is characterized in that

This eyeglass driving mechanism has: stationary magazine creel; The cam canister that runs through the periphery that is inserted into this stationary magazine creel and configure and this eyeglass holding frame is moved by self rotation along optical axis direction; And will come from the driving force of this drive source to the reducing gear of this cam canister transmission;

This reducing gear includes:

Driving force input axial region, it has the automatic focusing driving force input part that acceptance comes from the driving force of drive source;

First order angular contact bearing, its distolateral running through with this driving force input axial region inserts and is fixed on the inboard of inner ring, and be fixed with and this inner ring between the outer ring of clamping ball;

Second level angular contact bearing, it has inner ring and outer ring, this inner ring inserts distolateral running through of another of this driving force input axial region and be fixed in the inboard of inner ring, and transmit focusing driving force automatically, clamping ball between this outer ring and this inner ring, and transmission is based on the manual focus driving force of cameraman's operation;

Angular contact bearing is pressed pressure ring, and it is fixed on the outer ring of this second level angular contact bearing, and is provided with manual focus driving force input part;

Bearing housing, its outer ring with this first order angular contact bearing is fixing directly or indirectly, and, being configured with the state of this angular contact bearing by the pressure ring rubbing contact, and be equipped with this driving force input axial region, this first order angular contact bearing, this second level angular contact bearing; And

Driving force output axial region, its for the rotary driving force that will transmit from this second level angular contact bearing to the cam canister transmission, with the ball of this second level angular contact bearing is combined with the retainer that rotation mode freely supports, and be fixed in mode that can synchronous rotary on the turning axle of this second level angular contact bearing;

When automatic focus operation, the driving force that comes from drive source that is passed to this driving force input axial region is passed to the inner ring of this second level angular contact bearing, at this moment this angular contact bearing is kept bonding state by pressure ring and this bearing housing based on friction force, the inner ring synchronous rotary of this driving force output axial region and this second level angular contact bearing, the slip of eyeglass holding frame is mobile focuses thereby make

When manual focus moves, the driving force of transmitting by cameraman's operation is passed to this angular contact bearing by the manual focus of pressure ring driving force input part, at this moment utilize the driving force of transmitting by cameraman's operation, this angular contact bearing is disengaged by the bonding state based on friction force of pressure ring and this bearing housing, the outer ring synchronous rotary of this driving force output axial region and this second level angular contact bearing, the slip of eyeglass holding frame is mobile focuses thereby make.

12. eyeglass driving mechanism as claimed in claim 11, it is characterized in that, the described drive source of described eyeglass driving mechanism is the DC motor, and described reducing gear is fixed on gear on worm on the output rotating shaft of this DC motor and includes the engaging structure of this gear on worm and worm-gear toothing.

13. eyeglass driving mechanism as claimed in claim 12, it is characterized in that, in described eyeglass driving mechanism, described driving force input axial region arranges the worm-gear toothing that is meshed with gear on worm on the output rotating shaft that is fixed on described DC motor at the position of the regulation of its periphery

Described first order angular contact bearing utilize elastic component with a distolateral outer ring to another distolateral pressing, and the inner ring that another is distolateral is to distolateral pressing, thereby the ball clamping, utilize this inner ring that driving force is inputted axial region and supporting in the mode that can rotate

Described second level angular contact bearing utilize elastic component with a distolateral outer ring to another distolateral pressing, and the inner ring that another is distolateral is to distolateral pressing, thereby the ball clamping, this outer ring and described bearing housing press pressure ring via described angular contact bearing and frictional engagement together

In the situation that this angular contact bearing by the frictional engagement power of pressure ring and this bearing housing greater than the frictional engagement power of setting in this eyeglass driving mechanism, this angular contact bearing is maintained by the bonding state of pressure ring and this bearing housing, normally carries out automatic focus operation,

In the situation that this angular contact bearing by the frictional engagement power of pressure ring and this bearing housing less than the frictional engagement power of setting in this eyeglass driving mechanism, the manual focus action is normally carried out in the rotation of the outer ring of this second level angular contact bearing.

14. eyeglass driving mechanism as claimed in claim 13 is characterized in that, described reducing gear also comprises the angular contact bearing pressing member that supports described first order angular contact bearing,

This angular contact bearing pressing member is fixed in mode that can the shift position with respect to described bearing housing in the mode of the elastic force that can adjust described elastic component.

15. eyeglass driving mechanism as claimed in claim 13 is characterized in that described elastic component is disk spring.

16. eyeglass driving mechanism as claimed in claim 10 is characterized in that, coating moment of torsion oil on the slipping plane of the ball of described first order angular contact bearing and described second level angular contact bearing.

17. eyeglass driving mechanism as claimed in claim 11 is characterized in that,

Described eyeglass driving mechanism has:

The focusing gear, it is meshed with being fixed on the gear that described driving force exports on axial region, and is rotated centered by optical axis; And

Arm member, one is distolateral to combine with this focusing gear, and the jut of another distolateral periphery with being arranged at described cam canister combines;

Make focus lens is slided along optical axis direction mobile when, make the cam canister rotation from the driving force that is fixed on the gear transmission on this driving force output axial region via this focusing gear and this arm member, move thereby the eyeglass holding frame is slided.

18. eyeglass driving mechanism as claimed in claim 11 is characterized in that,

Described eyeglass driving mechanism has in the periphery of lens barrel:

Manual focus is with encircling; And

The manual focus rim gear wheel, distolateral this manual focus that is embedded in of one is used the interior week of encircling, and another manual focus distolateral and that arrange in the outer ring of described second level angular contact bearing utilizes the engagement between gear with the driving force input part and combines;

When the manual focus action of being undertaken by cameraman's operation, rotate with ring by operating this manual focus, the slip of eyeglass holding frame is moved focus.

19. a lens barrel is characterized in that, has used the described eyeglass driving mechanism of any one in claim 10～18.

20. a camera head is characterized in that, has used the described lens barrel of claim 19.

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