JP2008281937A - Drive transmission device, lens barrel, photographic optical apparatus, camera and personal digital assistant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive transmission device for use in driving a lens barrel by extending, retracting and housing a lens group at one configuration and by sending out the lens group to a predetermined position for use at the other configuration; to provide a compact thin lens barrel that uses the drive transmission device for driving a zoom lens particularly capable of relatively moving a plurality of lens groups and changing a focal length; and to provide a camera and a personal digital assistant. <P>SOLUTION: The drive transmission device is used for driving a moving part in a photographic optical apparatus, from an extension and retraction state for extending and retracting at least a portion of the plurality of lens groups 21, 22, 23, 24 to house the lens groups, to a photography state by moving at least a portion of the plurality of lens groups 21, 22, 23, 24 to the object side. The device includes an actuator 41 and gear mechanisms 42-49, wherein the gear 42 arranged in the actuator 41 and the gear 43 to be engaged with the gear 42 are spur gears. At least two axis right-angle conversion mechanisms are arranged for the gear connection after the spur gears, and the actuator 41 is arranged in parallel with an optical axis of lens of the lens group. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a movable portion in a photographing optical device that is in a photographing state by retracting at least a part of a plurality of lens groups and moving at least a part of the lens groups to a subject side from a retracted state in which the lens groups are accommodated. A drive transmission device used for driving, retracting and storing the lens group, or a lens barrel that uses the drive transmission device to move the lens group to a predetermined position, particularly a plurality of lens groups are relatively moved. The present invention relates to a lens barrel suitable for a zoom lens that can change the focal length and a photographing optical device such as a camera and a portable information terminal device to which the lens barrel is applied.

As a lens barrel suitable for a zoom lens capable of changing a focal length by relatively moving a plurality of lens groups, several techniques have been proposed in the past, and a photographing optical device using them. Has also been proposed (see, for example, Patent Documents 1 and 2).
In an imaging optical device such as a digital camera, the lens barrel is used for the imaging optical device main body other than at the time of shooting as the performance of a photographing lens such as a zoom lens capable of changing the focal length is improved and the size is reduced according to user requirements. There is an increasing use of a so-called collapsible photographic lens housed inside.
Patent Document 1 discloses a plurality of spur gears constituting a second gear train in a camera in which the lens barrel is driven in the optical axis direction by a second gear train that transmits the rotational force of the lens barrel motor to the lens barrel. However, there is disclosed a configuration in which the rotation shaft is provided perpendicular to the gear mounting surface, and the first and second gear trains are arranged side by side on the gear mounting surface, whereby the size can be reduced. That's it.
Furthermore, it is important to reduce the thickness dimension or width dimension of the lens barrel portion in the retracted state to the limit due to the demand for further thinning rather than simply miniaturization.
As a technique for coping with the demand for thinning and miniaturization of such an imaging optical device, the lens barrel has a collapsible configuration in which the lens barrel is housed in the imaging optical device main body other than during photographing, and the lens barrel is retracted A configuration is used in which some lenses retract from the optical axis during storage.
Such a technique is disclosed in, for example, Patent Document 2, and according to this, a configuration is disclosed in which the third group lens of the lens group is retracted outside the fixed cylinder outer diameter when retracted. .
Japanese Patent Laid-Open No. 2003-15198 JP 2006-39152 A

However, in the case of the prior art described above, if the actuator which is a lens barrel motor is installed in parallel with the optical axis of the lens, and all are constituted by spur gears, the number of gears is increased, resulting in a disadvantage of taking up space. .
In the case of this configuration, when the spur gear, which is the final stage of the gear mechanism, is manually rotated with the rotational moving frame formed on the outer diameter, the lens barrel itself is forcibly stored on the storage side. Since the lens drive control is not instructed to be stored, there is an inconvenience that the lenses come into contact with each other and the lens barrel is destroyed.
Furthermore, a worm is installed on the output shaft of an actuator mounted on another conventional lens barrel, meshed with a worm wheel, and thereafter connected by a spur gear. In this case, since the last stage gear of the lens barrel is in a direction parallel to the lens optical axis, the worm and the worm wheel are engaged, so the actuator is installed in a direction perpendicular to the lens optical axis. However, there was a problem that the size of the lens jumped out of the lens barrel and increased from the front.
Furthermore, when the actuator is installed in parallel with the optical axis of the lens, a worm is installed on the actuator output shaft, so that the size of the lens barrel in the optical axis direction is increased.
In view of the above-described circumstances, the object of the present invention is to retract the lens group in one form and store it, and in the other form, drive the lens group to a predetermined position to drive the lens barrel. Drive transmission device used in the present invention, in particular, a small and thin lens barrel, a camera and portable information that use this drive transmission device to drive a zoom lens that can change the focal length by relatively moving a plurality of lens groups It is to provide a terminal device.

In order to solve the above-described problem, the invention according to claim 1 is configured such that at least a part of the plurality of lens groups is retracted and at least a part of the lens groups is moved to the subject side from a retracted state in which the lens group is accommodated. In the drive transmission device used to drive the movable part in the photographing optical device to be in a photographing state by including an actuator and a gear mechanism, the gear disposed on the actuator and the gear meshing with the gear are spur gears, A drive transmission device is characterized in that at least two shaft right-angle conversion mechanisms are disposed in the gear connection after the spur gear, and the actuator is disposed in parallel with the optical axis of the lens.
According to the second aspect of the present invention, at least a part of the plurality of lens groups is retracted to move to the photographing state by moving at least a part of the lens groups to the subject side from the retracted state in which the lens group is accommodated. It has a fixed frame that does not move, and this fixed frame meshes with this gear in the lens barrel of the photographing optical device having an actuator for driving the movable frame and a gear mechanism. The gear is a spur gear, and at least two shaft right angle conversion mechanisms are arranged in the gear connection after the spur gear, and the actuator is characterized by a lens barrel in which the actuator is arranged in parallel with the optical axis of the lens.
According to a third aspect of the present invention, there is provided the lens barrel according to the second aspect, wherein the axis-right angle conversion mechanism is a combination of a worm and a worm wheel and a combination of a bevel gear.

According to a fourth aspect of the present invention, there is provided the lens barrel according to the third aspect, wherein the combination of the worm and the worm wheel is a condition where self-locking is applied.
According to a fifth aspect of the present invention, the lens barrel according to the third or fourth aspect is characterized in that the worm and the bevel gear are integrated.
The invention according to claim 6 is moved from the retracted state in which at least a part of the plurality of lens groups is retracted to house the lens group to the photographing state by moving at least a part of the lens group toward the subject. In the retracted state, at least one lens or lens group has a fixed frame that can be retracted outside the inner diameter of the rotary moving frame and does not move, and the fixed frame is for driving the moving frame. In a lens barrel in an imaging optical device having an actuator and a gear mechanism, a gear disposed on the actuator and a gear meshing with the gear are spur gears, and at least two shaft right-angle conversion mechanisms are connected to the gear connection after the spur gear. And a lens barrel in which the actuator is disposed parallel to the optical axis of the lens.
The invention according to claim 7 is characterized by the lens barrel according to claim 6, wherein the axis-right angle conversion mechanism is a combination of a worm and a worm wheel and a combination of a bevel gear.

The invention according to claim 8 is characterized by the lens barrel according to claim 7, wherein the combination of the worm and the worm wheel is a condition in which self-locking is applied.
The invention according to claim 9 is characterized by the lens barrel according to claim 7 or 8, wherein the worm and the bevel gear are integrated.
In the invention according to claim 10, at least a part of the plurality of lens groups is retracted to move the lens group from the retracted state in which the lens group is housed to move to the subject side. In the photographing optical device, the driving transmission device used for driving the movable portion is characterized by a photographing optical device equipped with the driving transmission device according to claim 1.
According to an eleventh aspect of the present invention, at least a part of the plurality of lens groups is retracted to move the lens group from the retracted state in which the lens group is housed to move to the subject side. The camera is characterized by a camera equipped with the lens barrel according to claim 2 or 6 as a lens barrel.
According to a twelfth aspect of the present invention, at least a part of the plurality of lens groups is retracted to move the lens group from the retracted state in which the lens group is accommodated to move to the subject side. The portable information terminal is characterized by a portable information terminal equipped with the lens barrel according to claim 2 or 6 as a lens barrel.

  According to the present invention, there is no need to provide a worm on the actuator output shaft even if the actuator which is a lens barrel motor is installed parallel to the optical axis of the lens. The front width of the camera can be made as small as possible, and the gear train connected to this gear also uses a combination of a worm, worm wheel, and bevel gears in the axis-right angle conversion mechanism. It is possible to provide a drive transmission device that can shorten the length of the camera, and a more compact camera equipped with the drive transmission device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic perspective view seen from the object side, schematically showing an external configuration of a camera which is a collapsible photographing optical apparatus to which the drive transmission device according to the present invention can be applied. FIG. 2 is a schematic perspective view showing a state in which the photographing lens of FIG. 1 protrudes from the camera body. FIG. 3 is a schematic perspective view of the camera shown in FIG. 1 as viewed from the back side which is the photographer side.
FIG. 1 shows the appearance of a camera in a retracted state as seen from an object, that is, the front side that is the subject side. FIG. 2 shows a state in which the photographing lens that is a photographing state protrudes, and FIG. 3 shows an appearance of the camera as seen from the back side that is the photographer side.
Although a camera is described here, a camera in which a camera function is incorporated in a portable information terminal device such as a so-called PDA (Personal Data Assistant) or a cellular phone has recently appeared. Many of such portable information terminal devices have substantially the same functions and configurations as the camera, although the appearance is slightly different, and the drive transmission according to the present invention is transmitted to such portable information terminal devices. You may employ | adopt the optical system apparatus containing an apparatus.

As shown in FIGS. 1 to 3, the camera A includes a photographing lens 1, a shutter button 2, a zoom lever 3, a finder 4, a strobe 5, a liquid crystal monitor 6, an operation button 7, a power switch 8, a memory card slot 9, a communication. A card slot 10 and a barrier operation unit 11 are provided.
FIG. 4 is a block diagram schematically showing a functional configuration of the camera of FIG. In FIG. 4, the camera A further includes a light receiving element 12, a signal processing device 13, an image processing device 14, a central processing unit (CPU) 15, a semiconductor memory 16, a communication card 17 and the like.
The camera A includes a photographing lens 1 and a light receiving element 12 as an area sensor such as a CCD (charge-coupled device) imaging element, and is an object to be photographed formed by the photographing lens 1 that is a photographing optical system, that is, The image of the subject is read by the light receiving element 12. As the photographing lens 1, an optical system device including a lens barrel described later is used.
Specifically, the optical system apparatus is configured by using a lens or the like that is an optical element constituting the lens barrel. The lens barrel includes a holding mechanism that holds each lens or the like so that the lens can be moved at least for each lens group. The photographing lens 1 incorporated in the camera A is usually incorporated in the form of this optical system device.

The output of the light receiving element 12 is processed by the signal processing device 13 controlled by the central processing unit 15 and converted into digital image information. The image information digitized by the signal processing device 13 is subjected to predetermined image processing in the image processing device 14 also controlled by the central processing unit 15 and then recorded in the semiconductor memory 16 such as a nonvolatile memory.
In this case, the semiconductor memory 16 may be a memory card loaded in the memory card slot 9 or a semiconductor memory built in the camera body. The liquid crystal monitor 6 can display an image being photographed, or can display an image recorded in the semiconductor memory 16. The image recorded in the semiconductor memory 16 can also be transmitted to the outside via a communication card 17 or the like loaded in the communication card slot 10.

When the camera is carried, the photographic lens 1 is in a retracted state as shown in FIG. 1 and is buried in the body of the camera A. A lens barrier (not shown) closes the photographic lens 1. When the user operates the barrier operation unit 11 to open the lens barrier, the power is turned on, and the lens barrel is extended as shown in FIG.
At this time, in the lens barrel of the photographing lens 1, the optical systems of the respective groups constituting the zoom lens are, for example, arranged at the short focal wide angle end, and the zoom lever 3 (FIGS. 2 and 3) is attached. By operating, the arrangement of each group optical system is changed, and the zooming operation to the telephoto end can be performed.
It is desirable that the optical system of the finder 4 is also scaled in conjunction with the change in the angle of view of the photographic lens 1. In many cases, focusing is performed by half-pressing the shutter button 2 (FIG. 2). Focusing in the zoom lens according to the present invention can be performed mainly by movement of a fourth lens group described later. When the shutter button 2 is further pushed down to the fully depressed state, photographing is performed, and then the processing as described above is performed.
When the image recorded in the semiconductor memory 16 is displayed on the liquid crystal monitor 6 or transmitted to the outside via the communication card 17 or the like, the operation button 7 (FIG. 3) is operated as specified. The semiconductor memory 16 and the communication card 17 are used by being loaded into dedicated or general-purpose slots such as the memory card slot 9 and the communication card slot 10 as shown in FIG.
When the photographing lens 1 is in the retracted state, a third lens group, which will be described later, is retracted from the optical axis and housed in parallel with the first lens group and the second lens group, so that the camera can be made thinner. Can be realized.

FIG. 5 is a schematic longitudinal sectional view showing a main part of a lens barrel constituting a collapsible photographing optical apparatus to which the drive transmission device according to the present invention can be applied. In FIG. 5, an optical system apparatus including a lens barrel includes a first lens group 21, a second lens group 22, a third lens group 23, a fourth lens group 24, a shutter / aperture unit 25, a solid-state image sensor 26, a lens. A holding frame 27 is included.
Further, a fixed frame 28 for fixing the solid-state imaging device 26, a first rotating cylinder 29, a first liner 30, a second rotating cylinder 31, a second liner 32, a cam cylinder 33, and a rectilinear cylinder 34 are included. .
In the shooting state, the first lens group 21, the second lens group 22, the third lens group 23, and the fourth lens group 24 are sequentially arranged from the object side, and the second lens group 22 and the third lens group 23 are arranged. In between, the shutter / aperture unit 25 is inserted and arranged. On the image plane side of the fourth lens group 24, a solid-state imaging device 26 configured using a CCD (charge coupled device) or the like is disposed.
The first lens group 21 to the fourth lens group 24 constitute a zoom lens having a variable focal length. The first lens group 21 includes one or more lenses, and is fixedly held on the rectilinear cylinder 34 via a lens holding frame 27 that integrally holds the first lens group 21.

The second lens group 22 includes one or more lenses, and a cam follower formed on a lens holding frame (not clearly shown) that integrally holds the second lens group 22 is a diagram of the cam cylinder 33. The cam groove is inserted into a cam groove for the second lens group (not shown), engages with the rectilinear groove 32a of the second liner 32, and is supported by the cam cylinder 33 and the second liner 32.
The shutter / aperture unit 25 includes a shutter and an aperture stop, and a cam follower formed integrally with the shutter / aperture unit 25 is inserted into a not-shown shutter / aperture cam groove of the cam cylinder 33, so that the second The liner 32 is engaged with the rectilinear groove 32 a and is supported by the cam cylinder 33 and the second liner 32.
Although not shown in the figure, a rectilinear groove and a cam groove along the axial direction are formed on the inner surface of the fixed cylinder 35 of the fixed frame 28. A cam follower formed on the outer peripheral surface of the base end portion of the first rotary cylinder 29 is engaged with the cam groove, and a key portion that is formed to protrude from the outer periphery of the base end portion of the first liner 30 to the straight advance groove. Are engaged.
A guide groove along a surface orthogonal to the optical axis is formed on the inner surface of the first rotating cylinder 29, and a cam follower projecting on the outer peripheral surface in the vicinity of the base end portion of the first liner 30 is engaged. Yes. Although not shown, a linear groove along the axial direction is formed on the inner surface of the first rotating cylinder 29, and a linear groove along the axial direction is also formed on the inner surface of the first liner 30. And helicoids are formed. Further, the first liner 30 is formed with a cam groove for inserting a cam follower projecting from the outer peripheral surface in the vicinity of the base end portion of the second rotating cylinder 31.

A helicoid is formed on the outer peripheral surface of the base end portion of the second rotary cylinder 31, and is screwed into the helicoid of the first liner 30, and protrudes from the outer peripheral surface near the base end portion of the second rotary cylinder 32. The cam follower engaged with the linear groove of the first rotating cylinder 29 through the cam groove of the first liner 30. A key portion protruding from the outer periphery of the base end portion of the second liner 32 is engaged with the linear groove of the first liner 30.
The cam cylinder 33 fitted to the inner periphery of the second liner 32 has a locking projection (not shown) protruding from the outer periphery of the base end fitted and locked to the base end of the second rotary cylinder 31. Thus, it operates integrally with the second rotating cylinder 31. A cam groove is formed on the inner peripheral surface of the second rotating cylinder 31, and a key portion provided on the outer peripheral surface of the front end portion of the second liner 32 is engaged with the cam groove.
The rectilinear cylinder 34 is inserted between the second rotating cylinder 31 and the second liner 32 on the base end side. A cam follower projects from the outer peripheral surface near the base end of the straight cylinder 34, and the cam follower engages with the cam groove of the second rotating cylinder 31. A rectilinear groove is formed in the inner peripheral surface of the rectilinear cylinder 34 along the axial direction, and a key portion on the outer peripheral surface of the front end portion of the second liner 32 is engaged with the rectilinear groove.

A gear portion is formed on the outer periphery of the base end portion of the first rotating cylinder 29, and the driving force of the actuator = zoom motor 51 is transmitted to the gear through appropriate gears, and these gears are rotationally driven. The first lens group 21, the second lens group 22, and the shutter / aperture unit 25 perform a zooming operation in a predetermined manner.
Note that the cam follower of each member, the key portion, and the cam groove of the corresponding member that engages with the member are not directly related to the present invention, and the description becomes complicated. To do.
For example, they include the cam groove of the second rotating cylinder 31 that engages with the cam follower of the rectilinear cylinder 34, the cam groove of the cam cylinder 33 that engages with the cam follower of the lens holding frame of the second lens group 22, and the shutter / aperture unit. The cam groove of the cam cylinder 33 that engages with the 25 cam followers, the cam groove of the first liner 30 that engages with the cam follower of the second rotary cylinder 31, and the first groove that engages with the key portion of the second liner 32. The linear groove of the liner 30, the rectilinear groove of the fixed frame cylinder 35 that engages with the key part of the first liner 30 of the fixed cylinder part, the cam groove of the fixed cylinder 35 that engages with the cam follower of the first rotating cylinder 29, etc. It is.
That is, the rotating cylinder closest to the outermost fixed cylinder is generally screwed into the fixed cylinder by the helicoid, and the helicoid moves from the shape at a constant speed. For this reason, at the short focal wide angle end position while being gradually driven from the retracted retracted state through the short focal wide angle end to the long focal telephoto end, the rotating cylinder is generally in a state where it is extended about halfway. is there.
On the other hand, in the above-described configuration, the first rotating cylinder 29 is engaged not with the fixed cylinder portion 35 of the fixed frame 28 but with a helicoid-shaped cam groove rather than simply screwed with the helicoid, and is in the stored state. The first rotary cylinder 29 is fully extended to the maximum extension position by driving from the short focal wide angle end to the maximum extension position, and thereafter the object side end of the cam groove is parallel to the end face of the fixed cylinder portion 35. In driving from the short focal wide angle end to the long focal telephoto end, the first rotary cylinder 29 is configured to idle.
Accordingly, the first rotary cylinder 29, which is the lens barrel closest to the fixed cylinder portion 35 at an early stage of the feeding operation, is completely fed out at an early stage, so that a third group frame 31 described later can be placed on the optical axis. The space to be inserted into is secured in advance.

FIG. 6 is a rear view of the third group frame portion viewed from the image plane side in order to explain the operation of the third group frame. In this figure, it is possible to move from the retracted state in which at least a part of the plurality of lens groups is retracted to house the lens group to the photographing state by moving at least a part of the lens group to the subject side, and the retracted state Briefly describes that at least one lens or lens group can be retracted outside the inner diameter of the rotary moving body.
The third lens group 23 shown in FIG. 5 is held by a third group frame 36 as a lens holding frame. The third group frame 36 holds the third lens group 23 at one end, and the other end is rotatable by a third group main guide shaft 37 substantially parallel to the optical axis of the third lens group 23. The third group main guide shaft 32 is supported so as to be slidable.
As shown in the drawing, the third group frame 36 is a fixed frame for fixing the third lens group 23 in the retracted storage state as indicated by the dotted line and the position on the optical axis where the third lens group 23 is inserted on the optical axis in the photographing state. It rotates about the third group main guide shaft 37 between the retracted position retracted from the 28 fixed cylinder portions 35.
In this case, in the vicinity of the third lens group 23 on the rotation end side of the third group frame 36, the rotation axis side and the support portion side of the third lens group 23 are parallel to the third group main guide shaft 37. A crank-like bent portion that changes the position in the direction is formed, and a stopper 36a and a light shielding piece 36b project from the bent portion substantially in the direction of the rotation end.
Although not described in detail, the third group frame 36 having such a configuration and the third lens group 23 on the rotation end side thereof are rotationally driven by a third group motor that is sequentially transmitted to the third group lead screw via a gear train. Thus, the storage member is rotated from the storage position to the position on the optical axis by the linkage operation of various members. At this time, the position on the optical axis of the third group frame 36 is correctly set to the position on the optical axis by the stopper 36a of the third group frame 36 coming into contact with the third group sub guide shaft 38.
When the third group frame 36 reaches the storage position, the position is detected by the photo interrupter 39, and the first lens group 21, the second lens group 22, and the shutter / aperture unit 25 are allowed to move to the retracted storage position. The

FIG. 7 is a schematic side view showing a drive transmission device according to the present invention for driving the rotary moving body of the photographing optical device. FIG. 8 is a schematic perspective view showing the drive transmission device of FIG. 7 as viewed from the object side. FIG. 9 is a schematic perspective view seen from the object side, showing the drive transmission device of FIG. 7 assembled to a fixed frame.
In the above description, the entire camera has been described. Next, a drive transmission device that is a main invention of the present application will be described with reference to FIGS. Although applicable to other rotating bodies, the drive transmission device 40 according to the present invention is assumed to be applied to drive a rotating body such as the first rotating cylinder 29 shown in FIG. explain.
The drive transmission device 40 includes an actuator 41 having an output shaft 41a, a pinion gear 42 which is a first gear attached to the output shaft 41a, a second gear 43 which is a spur gear and meshes with the pinion gear 42, and the second gear 43. And a third gear 44 made of a spur gear whose shaft portion forms a worm 44a.
The drive transmission device 40 also includes a worm wheel 45 that meshes with the worm 44a to constitute a worm gear, and a first bevel gear (bevel gear) 46 that is coaxial therewith. The first bevel gear 46 is engaged with a second bevel gear (bevel gear) 47, a fourth gear 48 that is a spur gear coaxial with the second bevel gear 47, and a first gear that is meshed with the fourth gear 48 and is a spur gear. 5 gears 49 are included.

In this drive transmission device 40, the actuator 41 is generally configured using a pulse motor, and for example, the first to third lens groups 21 to 23 described in FIG. 5 and, for example, the fourth lens group. 24 is driven in cooperation with each other in a software manner to achieve an appropriate zooming operation and an appropriate focusing operation.
The drive transmission device 40 is configured to mesh with a gear-shaped portion 29a formed on the outer periphery of the rotating body 29 such as the first rotating cylinder by the fifth gear 49 described above. The entire drive transmission device 40 is fixed to the upper peripheral portion of the fixed cylinder portion 35 of the fixed frame 28.
The drive transmission device 40 described above, for example, moves at least a part of the plurality of lens groups from the retracted state in which the lens group is accommodated by retracting at least a part of the plurality of lens groups to the objective side in the configuration shown in FIG. This is used to drive a movable portion that is a rotating body that retracts the lens group in the photographing optical device that is in a photographing state.
In this drive transmission device 40, for example, a combination of a worm 44a and a worm wheel 45 and a combination of a bevel gear 46 are used as the axis-right angle conversion mechanism. In this case, the combination of the worm 44a and the worm wheel 45 is configured to be a condition for self-locking.
The above-described conditions for the self-locking simply mean that the worm 44a and the worm wheel 45 are fixed to each other. It is also possible to adopt a configuration in which the worm and the bevel gear are integrated.
Here, the expression that the worm 44a and the worm wheel 45 are fixed to each other, or that the worm and the bevel gear are integrated is integrated by bonding or screwing the worm, the worm wheel, and the bevel gear. It means a state that is integrally molded from the beginning.

It is the schematic perspective view seen from the object side which shows typically the appearance composition of the camera which is the retractable photography optical device which can apply the drive transmission device by the present invention. It is a schematic perspective view which shows the state which the imaging lens of FIG. 1 protrudes from the main body of a camera. It is the schematic perspective view which looked at the camera of FIG. 1 from the back side which is a photographer side. It is a block diagram which shows typically the function structure of the camera of FIG. It is a schematic longitudinal cross-sectional view which shows the principal part of the lens barrel which comprises the collapsible type imaging optical apparatus which can apply the drive transmission device by this invention. In order to explain the operation of the third group frame, it is a rear view of the third group frame portion viewed from the image plane side. It is a schematic side view which shows the drive transmission device by this invention which drives the rotational movement frame of an imaging optical device. FIG. 8 is a schematic perspective view showing the drive transmission device of FIG. 7 as viewed from the object side. It is the schematic perspective view seen from the object side shown in the state which assembled | attached the drive transmission device of FIG. 7 to the fixed frame.

Explanation of symbols

A shooting optical device (camera), 1 shooting lens, 21 first lens group, 22 second lens group, 23 third lens group, 24 fourth lens group, 25 shutter / aperture unit, 26 solid-state imaging device, 27 lens holding Frame, 28 Fixed frame, 29 Rotating moving body (first rotating cylinder), 29a Gear-shaped portion, 30 First liner, 31 Rotating moving body (second rotating cylinder), 32 Second liner, 32a Straight groove , 33 cam cylinder, 34 rectilinear cylinder, 35 fixed cylinder, 36 third group frame, 37 third group main guide shaft, 38 third group sub guide shaft, 40 drive transmission device, 41 actuator, 42 first gear (pinion gear) ), 43 2nd gear (spur gear), 44 3rd gear (spur gear), 44a Worm, 45 Worm wheel, 46 1st bevel gear, 47 2nd bevel gear, 48 4th gear ( Spur Gear), 49 Fifth Gear (Spur Gear)

Claims (12)

  To drive a movable part in a photographic optical device in which at least a part of a plurality of lens groups is retracted and at least a part of the lens group is moved to a subject side from a retracted state in which the lens group is accommodated. The drive transmission device used includes an actuator and a gear mechanism, the gear disposed on the actuator and the gear meshing with the gear are spur gears, and at least two axial right angle conversion mechanisms are disposed in the gear connection after the spur gear. The drive transmission device, wherein the actuator is disposed in parallel with the optical axis of the lens.   There is a fixed frame that can be moved to a shooting state by moving at least a part of the plurality of lens groups to the subject side from a retracted state in which at least a part of the plurality of lens groups is retracted to house the lens group. In the lens barrel of the photographic optical device having an actuator for driving the moving frame and a gear mechanism, the fixed frame is a spur gear, and the gear installed on the actuator and the gear meshing with the gear are spur gears. A lens barrel characterized in that at least two axis-right angle conversion mechanisms are arranged in a gear connection after the gear, and the actuator is arranged in parallel with the optical axis of the lens.   The lens barrel according to claim 2, wherein the right-angle conversion mechanism includes a combination of a worm and a worm wheel and a combination of a bevel gear.   4. The lens barrel according to claim 3, wherein the combination of the worm and the worm wheel is configured to be self-locking.   The lens barrel according to claim 3 or 4, wherein the worm and the bevel gear are integrated.   It is possible to move from a retracted state in which at least a part of the plurality of lens groups is retracted to house the lens group to a photographing state by moving at least a part of the lens group toward the subject, and in the retracted state, at least one lens Alternatively, the lens group can be retracted outside the inner diameter of the rotary moving frame and has a fixed frame that does not move, and the fixed frame has an actuator and a gear mechanism for driving the moving frame. In the lens barrel, the gear disposed in the actuator and the gear meshing with the gear are spur gears, and at least two shaft right angle conversion mechanisms are disposed in the gear connection after the spur gear, and the actuator transmits the light of the lens. A lens barrel arranged parallel to an axis.   7. The lens barrel according to claim 6, wherein the right-angle conversion mechanism comprises a combination of a worm and a worm wheel and a combination of a bevel gear.   8. The lens barrel according to claim 7, wherein the combination of the worm and the worm wheel is configured to be self-locking.   9. The lens barrel according to claim 7, wherein the worm and the bevel gear are integrated.   A movable portion is driven in a photographing optical device that is in a photographing state by retracting at least a part of a plurality of lens groups and moving at least a part of the lens groups to a subject side from a retracted state in which the lens group is accommodated. A drive optical device according to claim 1, wherein the drive transmission device according to claim 1 is mounted.   3. A camera according to claim 2, wherein at least a part of the plurality of lens groups is retracted and the camera is brought into a photographing state by moving at least a part of the lens groups from the retracted state in which the lens group is housed to the subject side. Or a camera equipped with the lens barrel according to 6;   In a portable information terminal that is in a photographing state by moving at least a part of the lens group from the retracted state in which at least a part of the plurality of lens groups is retracted to house the lens group to the subject side, as a lens barrel, A portable information terminal comprising the lens barrel according to claim 2.

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