JP2907467B2 - Optical device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device having a variable power function.

[Conventional technology]

Conventionally, for example, in the case of a small zoom camera, as shown in FIG. 13, in order to position the photographing optical systems of the front and rear groups at a continuously changing focal length, the position is regulated by one cam ring 201 and a straight cam 202. It had a structure to perform zooming. When retracting, the cam ring 201 is further rotated from the WIDE position until the distal end of the lens barrel 203 shown in the state of WIDE in FIG. 13 is flush with the front end of the cover 204, and the lens barrel 203 is collapsed. It has a simple structure.

[Problems to be solved by the invention]

 The above conventional example has the following problems.

(I) Due to the configuration of the cam ring that regulates the position of the photographing optical system in the front and rear groups, the photographing optical system is retracted in the WIDE state, that is, with the space between the front group and the rear group being widened. Camera thickness increases.

(Ii) In order to eliminate the above-mentioned drawback, in order to reduce the distance between the front and rear lens groups during collapsing, as shown in FIG. 14, the WIDE end of the cam groove 301 for restricting the position of the rear lens group (301b in the figure) In the case where the notch 301a is provided on the extension of the section and the thickness of the camera at the time of collapse is to be reduced, even if the lens interval between the front and rear groups is narrowed as shown in FIG. Since there is no change in the length of the cam ring, the thickness of the camera at the time of collapsing depends on the length of the cam ring, and as a result, it is not so different from the case (i).

(Iii) As shown in FIG. 16, a cam ring 164 and a rectilinear cam 162 for retracting the entire lens barrel including the rectilinear cam 202 are provided on the outer peripheral portion of the rectilinear cam 202, as shown in FIG. By engaging with the pin 163 implanted in the cam 202 and rotating the cam ring 164, it is conceivable that the entire lens barrel is retracted. The position accuracy in the direction of the optical axis may become unstable in the state where the lens is extended from the retracted position, and there is a problem that optical performance during zooming is impaired.

In FIG. 16, reference numeral 165 denotes a power transmission unit for performing zooming driving of the photographing lens, and 166 denotes an outer cover of the camera.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical device that can achieve downsizing, and can guarantee the positional accuracy of the variable power optical system in the optical axis direction with a simple configuration and good operability.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a positioning means for positioning a guiding means for guiding a variable power optical system for a variable power operation so as not to move in the optical axis direction, and Optical means having a driving means for moving to a position, and an operating means for moving the variable power optical system guided by the guide means positioned so as not to move in the optical axis direction by the positioning means for a magnification operation. Device.

Further, the present invention provides a positioning means for positioning a guide means for guiding a variable power optical system for a variable power operation so as not to move in the optical axis direction, and the guide means by moving the positioning means to an operation position. Moving means for receiving the action of the positioning means, driving means for moving the moving means to an operating position or a non-operating position of the positioning means, and being positioned so as not to move in the optical axis direction by the positioning means. Operating means for moving the variable power optical system guided by the guide means for a variable power operation.

The present invention also provides a variable power optical system, first guiding means for guiding the variable power optical system for a variable power operation, and extending the variable power optical system and the first guiding means from a retracted position. A second guiding means for guiding to a position, and a positioning for moving the first guiding means guided to the feeding position by the second guiding means by moving to the operating position so as not to move in the optical axis direction. An optical device comprising: means for moving the variable-magnification optical system guided by the first guide means positioned so as not to move in the optical axis direction by the positioning means for a magnification operation; and Is what you do.

The present invention also provides a variable power optical system, first guiding means for guiding the variable power optical system for a variable power operation, and extending the variable power optical system and the first guiding means from a retracted position. A second guiding means for guiding to a position, a positioning means for positioning the first guiding means guided to the feeding position by the second guiding means so as not to move in the optical axis direction; Moving means for causing the first guide means to receive the action of the positioning means by moving to the action position; and the first means positioned by the positioning means so as not to move in the optical axis direction.
Operating means for moving the zoom optical system guided by the guide means for zooming operation.

〔Example〕

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 9 of the accompanying drawings.

FIG. 1 is an exploded perspective view of a zoom lens barrel according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a first-group barrel holding a first-group lens (not shown) at a distal end 1a, and 2 denotes a first barrel.
A second group cam ring rotatably fitted on the inner peripheral surface of the shutter base plate 3 holds a second group lens (not shown) and a known shutter unit, and a fourth group lens holds a third group lens. The third group holder 5 is a first group cam ring for defining the position of the first group lens and the first group barrel 1 in the photographing optical axis direction, and the sixth group 6 is rotatably fitted to the outer peripheral surface of the first group cam ring 5. And a linear guide having an axial groove 6a formed on the inner peripheral surface thereof for moving the first lens barrel 1 linearly only in the direction of the photographing optical axis.

An internal gear (not shown) is attached to the inner peripheral surface of the rear end portion 5a of the first group cam ring 5, and a gear 7 (shown) meshes with the internal gear. The gear 8 receiving the power from the drive source is engaged. The first group cam ring 5 is rotatably held on the inner peripheral surface of the aforementioned linear guide 6. A pin 9 protruding from the outer peripheral surface of the ring 5 is inserted into a circumferential groove 6b of the aforementioned linear guide 6. Therefore, the first group cam ring 5 cannot move in the optical axis direction.

On the other hand, a pin 10 is also protruded from the outer peripheral surface of the first lens barrel 1, and this pin 10 is inserted into the cam groove 5b of the cam ring 5 so as to be relatively slidable. The first lens barrel 1 is also slidably inserted into 6a, so that the position of the first lens barrel 1 in the optical axis direction is controlled by the cam groove 5b.

When the gear 8 starts receiving power from a drive source (not shown) and starts rotating, the gear 7 rotates. This rotating force is transmitted to the internal gear of the cam ring 5 and the cam ring 5 starts rotating. Since the pin 10 implanted in the first lens barrel 1 is relatively slidable in the cam groove 5b and the axial groove 6a, when the cam ring 5 rotates, the first group mirror is displaced by the displacement of the cam groove 5b in the optical axis direction. The cylinder 1 is driven in the direction of the optical axis, and as a result, zooming movement of the first group lens is performed.

Next, the zooming mechanism and operation of the second group lens will be described.

The second-group cam ring 2 is rotatably held on the inner peripheral surface of the first-group lens barrel 1, and a pin 11 implanted at the rear end 2 a is slidably inserted into the circumferential groove 1 b of the first-group lens barrel 1. At the same time, the cam ring 5 is relatively slidably inserted into the groove 5c in the optical axis direction.

Therefore, when the cam ring 5 starts rotating, the first lens barrel 1
Moves along the optical axis, but the movement of the second group cam ring 2 in the direction of the optical axis is prohibited by the implantation pin 11 and by the circumferential groove 1b of the first group barrel 1, so that the cam ring 2 It moves together with the lens barrel 1 in the optical axis direction. Further, since the movement of the implantation pin 11 in the rotational direction is prohibited with respect to the cam ring 5 by the groove 5c of the cam ring 5, when the cam ring 5 rotates, the second group cam ring 2 becomes the first group barrel 1
And at the same time as the cam ring 5 is rotated.

The first lens barrel 1 is fixed inside thereof in parallel with the optical axis.
It has book guide bars 12 and 13. One guide bar 12 is slidably inserted into the hole 3a of the shutter base plate 3, and a compression spring 14 fitted in the guide bar 12 moves the shutter base plate 3 rearward parallel to the optical axis (rightward in FIG. 1). ). The other guide bar 13 is fitted into a notch groove 3b on the outer peripheral edge of the shutter base plate 3, so that the base plate 3 does not rotate around the optical axis. Therefore, the base plate 3 can only move parallel to the optical axis.

The shutter base plate 3 includes a known shutter unit 3 together with components such as shutter blades 32 and 33, a blade holder 34, and the like.
The shutter base plate 3 is provided with a stepping motor 190 for driving a third group lens and a motor SM for driving shutter blades, which will be described later.

A planting pin 3c is also fixed to the shutter base plate 3, and the pin 3c is engaged with the cam surface 2b of the second group cam ring 2.

Since the shutter base plate 3 is urged backward along the optical axis direction by the compression spring 14, the pin 3 c is pressed against the cam surface 2 b of the second group cam ring 2 by the force of the spring 14. Accordingly, when the cam ring 5 is rotated, the second group cam ring 2 is also rotated as described above, and the shutter base plate 4 holding the second group lens is moved in the optical axis direction by the cam surface 2b, whereby the second group lens is rotated. Zooming operation occurs. As described above, since the shutter base plate 3 can move in the forward direction of the optical axis against the force of the compression spring 14, the shutter base plate 3 is moved forward in parallel with the optical axis during collapsing. By doing so, the distance between the first group lens and the second group lens can be reduced.

Next, the movement mechanism and operation of the third group lens will be described.

Third group guide bars 15 and 16 are fixed to the third group holder 4 holding the third group lens so as to be parallel to the optical axis at optical axis symmetric positions.

One guide bar 15 has a compression spring 17 fitted around its outer periphery and is slidably fitted into a hole 3c 'of the shutter base plate 3. The spring 17 urges the third group holder 4 backward in the optical axis direction, and plays a role of reducing backlash in a threaded portion between the helicoid shaft 18 and the female helicoid cylinder described later and backlash in the reduction gear train. I have. The other guide bar 16 is engaged with the cutout groove 3d of the base plate, so that the holder 4 does not rotate around the optical axis. Further, a helicoid shaft 18 disposed in parallel with the guide bars 15 and 16 protrudes from the holder 4, and the helicoid shaft 18 is screwed into a female helicoid cylinder integral with the gear 19, so that the gear 19 By rotating, the third group holder 4 can be moved in the optical axis direction.

190 is a permanent magnet rotor 20 which is polarized to four poles in the circumferential direction.
FIG. 2 is a front view of the motor. Yokes 21 and 23
Forms one magnetic path with the bobbin 25, and the yoke 22
And 24 together with the bobbin 26 form a magnetic path.

Reference numeral 27 denotes a magnet cover having a fitting hole 27a for rotatably positioning the upper end of a center shaft 28 fixed to the permanent magnet rotor 20. The other end 28a of the center shaft 28 is rotatably held by a through hole 3e provided in the shutter base plate 3, and is supported between the above-mentioned magnesium cover 27 and the center cover 28. Further, the shaft end 28a protrudes to the rear side of the shutter base plate 3, and a pinion 29 for transmitting the output is fixed to the tip end.

In the stepping motor having the above configuration, the coils wound on the bobbins 25 and 26 are energized to excite the yokes 21 to 24, and the phase of the energization is appropriately switched to thereby change the permanent magnet rotor 20. Rotates, and its output is transmitted to the pinion 29. When the pinion 29 starts rotating, the reduction gear train 30 sequentially rotates, and the gear 19 integrated with the female helicoid cylinder starts rotating. By this rotation, the helicoid shaft 18 is driven in the optical axis direction, and the third group holder 4 moves in the optical axis direction, that is, zooms the third group lens.

In this embodiment, a rear focus type photographing lens in which focus correction, that is, AF (autofocus) is performed by the third group lens is configured, so that the third group lens is a lens for focus correction in addition to the above-described zooming operation. Position control is also performed. Note that the driving principle is the same as in the above-described case, and a description thereof will be omitted.

Reference numeral 35 denotes a gear holding plate fixed to the rear end of the linear guide 6. The gear holding plate 35 has a fixed shaft 35a for rotatably supporting the gear 7 and a rotating shaft 35b for rotatably supporting the gear 8. And a screw hole screwed to a helicoid shaft 36a described later, that is, a female helicoid hole 35c and a female helicoid hole 35d screwed to the helicoid shaft 37a penetrate in parallel with the optical axis. The positions of the female helicoid holes 35c and 35d are located on a circumference having a diameter smaller than the outer diameter of the lens barrel 1, and the helicoid shafts 36a and 37a screwed into the female helicoid holes 35c and 35d are connected to other members. The positions of the holes 35c and 35d are determined so as not to hit each other. Reference numeral 35e denotes a stopper pin that collides with the shutter base plate 3.

Reference numeral 38 denotes a fixed lens barrel. The fixed lens barrel 38 is fixed to a camera body 39. The rectilinear guide 6 is inserted into the fixed lens barrel 38 and can be moved in the front-rear direction in parallel with the optical axis. As shown in FIG. A group cam ring 2 is fitted in this order from the outside to the inside, and a shutter base plate 3 is provided inside the second group cam ring 2.
The third group holder 4 is arranged further rearward than the shutter unit 31, and a gear carrying plate 35 attached to the rear end of the straight guide 6 is arranged.

The rectilinear guide 6, the first group cam ring 5, the first group lens barrel 1, the second group cam ring 2, the shutter unit 31, the third group holder 4, and the gear holding plate 35 can be moved in the fixed lens barrel 38 along the optical axis direction. A unit composed of these seven main members is referred to as a photographing lens barrel unit in this specification.

An axial ridge 6f protrudes from the outer peripheral surface of the rectilinear guide 6 and slides relative to an axial groove (not shown) formed on the inner peripheral surface of the fixed lens barrel. Since the linear guide 6 is movably fitted, it can move in the fixed barrel 38 along the axial direction without rotating.

At the rear end of the straight guide 6, a large diameter portion 6g is formed.
Projections 6c, 6d, and 6e (see FIG. 6) for determining the position of the taking lens barrel unit in the optical axis direction by rotation of a bayonet ring 43 described later are provided on the outer peripheral surface of the large diameter portion 6g. The projections 6c, 6d and 6e are adapted to engage with a later-described bayonet ring 43.

Inside the camera body 39, a power transmission mechanism for moving the gear carrying plate 35 and the rectilinear guide 6 forward and backward parallel to the optical axis, a power transmission mechanism for rotating the bayonet ring 43, and the gear 8 are rotated. And a power transmission mechanism for transmitting a driving force therefor. These power transmission mechanisms include a ring gear 40 and a ring gear 4 shown in FIG.
The two gears 36 and 37 meshing with the 0 internal teeth, the gears 36 and 37
Helicoid shafts 36a and 37 formed integrally with each of
a, a bayonet ring 43 in which a gear portion 43d is formed on a part of the outer peripheral surface, and the like.

Hereinafter, the structure of the power transmission mechanism will be described with reference to FIG. 1 and FIG.

As shown in FIG. 1, the camera body 39 is provided with a hole 39c capable of accommodating the photographing lens barrel unit,
As shown in FIG. 3, a gear support shaft 39a which fits into a concave portion of the end face of the gear 36 and a gear 37 are provided at the innermost end face of the hole 39c.
And a gear support shaft 39b that fits into a concave portion of the end surface of the gear 39. The gear 39 is rotatably supported at a fixed position by the shaft 39a, and the gear 37 is rotatable at a fixed position by the shaft 39b. Supported.

The gear 36 and the gear 37 are gears with a screw shaft integrally formed with the helicoid shaft 36a and the helicoid shaft 37a, respectively. The shaft 37a is screwed into the female helicoid hole 35d (screw hole) of the gear holding plate 35.

Ring gear 40 meshing with gears 36 and 37 has external teeth on the outer peripheral surface.
A gear 40a is formed and the internal teeth 40b are formed on the inner peripheral surface, and the gears 36 and 37 are provided on the internal teeth 40b of the gear 40.
And are engaged.

The ring gear 40 is connected to the camera body 39 as shown in FIG.
Is rotatably arranged at the innermost position of the taking lens barrel unit housing hole 39c and has its own internal teeth 40.
gears 36 and 37 mesh with b, and the ring gear 4
The gear 48 meshes with the zero external teeth 40a. The gear 48 protrudes to the outside from a window opened on the upper surface of the camera body 39, and a gear (not shown) rotated by a drive source (not shown) meshes with the gear 48.

In order to prevent the ring gear 40 and the gears 36 and 37 from moving in the axial direction, a gear holding plate 41 having a hole 41a that fits loosely on the helicoid shaft 36a, and a gear holding plate having a hole 42a that fits loosely on the helicoid shaft 37a. 42 and the helicoid axes 36a and 3 respectively
7a, the pressing plates 41 and 42 are arranged facing the end faces of the gears 36 and 37 and the ring gear 40, and
41 and 42 are fastened to the camera body 39 with screws or the like.

A counterbore portion 39d is formed at an opening edge of the hole 39c of the camera body 39, and the bayonet ring 43 is rotatably disposed at the counterbore portion 29d. Bayonet ring 43
A gear portion 43d is formed on a part of the outer peripheral surface of the device, and a gear 47 for rotating the bayonet ring 43 meshes with the gear portion 43d. The bayonet ring 43 is formed with three steps 43a, 43b, 43c, and each step has a bayonet ring holding plate 44- having a springy contact piece so as not to move the bayonet ring 43 in the axial direction. The holding plates 44 to 46 are fastened to the end surface of the camera body 39 with screws or the like. These bayonet ring retainers 44-46
Corresponds to the three projections 6c, 6d, 6e of the straight guide 6.

Next, in the above configuration, the taking lens barrel unit is in the retracted position (the state shown in the lower half of FIG. 3).
The operation of each unit when it is fed forward from is described.

When the gear 48 is rotated by a drive source (not shown), the ring gear 40 is rotated, and the gear 36 meshing with the gear 40 and
37 are rotated by the same direction and the same rotation angle, respectively.
For this reason, the helicoid shafts 36a and 36
7a is rotated, and the gear carrier plate 35 screwed to the shafts 36a and 37a is moved forward parallel to the optical axis. Therefore, the rectilinear guide 6 integrated with the gear carrying plate 35 advances inside the fixed lens barrel 38,
One group cam ring 5 and one group barrel housed in straight guide 6
The first group cam ring 2, the shutter unit 31, and the third group holder 4 move forward together with the rectilinear guide 6. At this time, the linear guide 6 advances because the ridge 6f protruding from the outer peripheral surface of the linear guide 6 is fitted in the axial groove of the inner peripheral surface of the fixed lens barrel 38. There is no. Further, during this forward movement, the first group lens barrel 1 is actuated by the action of the spring 14 on the guide bar 12 provided in the second group cam ring 2.
Since the distance between the first group lens and the second group lens gradually increases, the distance between the first group lens and the second group lens gradually increases. Then, a projecting pin of the gear holding plate 35 is provided on the rear surface of the shutter base plate 3.
After abutment of 35e, the third group holder 4 separates from the holding plate 41, and the lens barrel unit is extended from the fixed lens barrel 38 while the distance between the first lens group and the second lens group is kept constant. .

When the extension of the lens barrel unit approaches the end, the lens barrel unit reaches a position passing through the bayonet ring 43, and the large diameter portion 6g at the rear end of the rectilinear guide 6 becomes the hole 38 of the fixed lens barrel 38.
The straight guide 6 fits into the a
Supported by FIG. 6 shows the state at this time.

When the power supply for extending the lens barrel unit is cut off (that is, when the rotation of the gear 48 stops), the unit stops. At this time, the bayonet ring holding plate 44,4
5, 46 should generate a force to return the three protrusions 6c, 6d, 6e of the straight guide 6 to the rear of the optical axis, respectively.
The first part of the bayonet ring 43 corresponding to 6c, 6d, 6e
Since there are steps 43a, 43b, and 43c as shown in the figure, the bayonet ring presser plate is locked at the steps, and the lens barrel unit has its rear end passed through the bayonet ring 43 (i.e., The unit stops with the unit rear end positioned further forward than the front end surface of the bayonet ring 43 shown in FIG.

In this state, power from a drive source (not shown) is transmitted to the gear 47, and the gear 47 starts rotating clockwise.

Therefore, the bayonet ring 43 starts rotating counterclockwise. When the bayonet ring rotates, the stepped portion 43 that has been locked by the spring force of the bayonet ring holding plates 44, 45, 46.
Since a, 43b, and 43c also rotate, their locking is released, and the bayonet ring holding plates 44, 45, and 46 become the projections 6c, 6 of the linear guide 6.
It starts to generate a force that pushes d and 6e backward of the optical axis. However, at this time, since the bayonet ring 43 has already been rotated by a certain angle, the projections 6c, 6d, 6e of the rectilinear guide 6 are press-fitted to the bayonet ring portions 43e, 43f, 43g by the pressing force.

As the bayonet ring 43 continues to rotate,
Cut-and-raised cams 43h and 43 provided on the bayonet ring
The rear ends of the projections 6c, 6d, 6e of the linear guide 6 are pushed by the cams by i, 43j, and the unit is further advanced forward of the optical axis by overcoming the pressing force.

Thereafter, the projections 6c, 6d, 6e are driven when the projections 6c, 6d, 6e ride on plane portions 43k, 43l, 43m parallel to the front end surfaces provided on extensions of the cam surfaces 43h, 43i, 43j of the bayonet ring 43. Power from the source is shut off.

FIG. 7 shows a front view of a main part in a state where the movements so far are completed. In this state, the lens barrel unit is completely extended from the retracted position and is firmly locked at the photographing standby position. The state inside the lens barrel at this time is shown in the upper half of FIG.

FIGS. 8 and 9 illustrate a state in which the gear 8 for rotating the cam ring 5 and the gear 50 for rotating by receiving the power from a drive source (not shown) are connected by the above-described retracting operation from the retracted position. FIG. 2 is a cross-sectional view of a main part for the embodiment. FIG. 8 shows a state in which the gear 8 and the gear 50 are being pulled out from the retracted position, and the gear 8 and the gear 50 are not yet connected in this state. After that, when the lens barrel unit is drawn out and the gear 8 and the gear 50 are connected as shown in FIG. 9, the teeth of the gear 8 and the gear 50 do not interfere with each other. When the lens barrel unit is drawn out (that is, when the gear 8 and the gear 50 are well engaged), the gear 50 waits at the position shown by the solid line under the urging force of the coil spring 49,
The connection with the gear 8 is performed.

However, when the teeth of the gear 8 and the teeth of the gear 50 interfere with each other due to the hollowing out of the lens barrel unit (that is, the teeth of the gear 8 and the gear 50 collide with each other), the gear 50 is attached to the camera body.
While being held rotatably by a shaft 39e projecting from 39, it retracts to the position shown by the one-dot chain line in FIG. 9 against the urging force of the coil spring 49. Even when the gear 50 is retracted, the driving force from the drive source (not shown) is transmitted (for example, the gears on the driving side (not shown) can be meshed with each other even at the retracted position of the gear 50). Receiving power from the drive source, the gear 50
However, when the gear 50 rotates to a position where it can mesh with the gear 8, the gear 50 slides to the position shown by the solid line in the figure by the force of the spring 49, and the gear 50 is connected.

In the state where the extension from the retracted position is completed, the first, second, and third lens units are not at the photographing position, and thereafter, the camera rotates the cam ring 5 by a certain angle by the above-described driving means. Then, the first group lens is extracted to the WIDE photographing position shown below the optical axis in FIG. Therefore, the first lens group and the second lens group are
The spacing is further increased by the action of 14, and the second group lens is held at the WIDE photographing position, like the first group lens, with the planting pin 3c of the shutter base plate 3 abutting against the cam surface 2b of the second group cam ring 2. . A cross section of the main part of the taking lens unit at this time is shown below the optical axis in FIG. Also, the upper side of the optical axis in FIG. 4 is a state where the hollowing out of the lens barrel unit from the retracted position is completed, which is the same as the state shown on the upper side of the optical axis in FIG.

After rotating the cam ring 5 to the above state, the third lens unit is moved to the stepping motor unit 19 as described above.
Drive to the appropriate position by 0, and the taking lens system is WIDE
Complete the preparation for shooting. The cross section of the main part of the taking lens unit at this time is shown above the optical axis in FIG. Also, the lower side of the optical axis in FIG. 5 shows a state when the photographing lens system is arranged at the TELE position by zooming, but the zooming operation has been described in detail earlier, and therefore will be omitted.

Further, when the lens barrel unit is retracted from the retracted state, only the movement of each part in the above-described retracting from the retracted state is reversed, so that the details are omitted.

In the above embodiment, the taking lens barrel unit is
The unit is engaged and held by a bayonet ring 43 and bayonet ring pressing plates 44, 45, and 46, and the outer shape is inserted into a hole 39c of the camera body 39 as shown in FIG. The straight-moving guide 6 including the guided barrel unit is rotated clockwise in FIG. 10 from the above-mentioned drawn-out position by known driving means, and the projections 6c, 6d, 6e are formed as shown in FIG. The object of the present invention is also achieved by a configuration in which each of the holding plates 44, 45, and 46 is held between the camera body 39. At this time, the gear holding plate 35 cannot be rotated due to helicoid coupling with the helicoid shafts 36a and 37a, but it goes without saying that the gear holding plate 35 is rotatably held with respect to the rectilinear guide 6. No. Further, as shown in FIG. 12, the projections 6c, 6d, 6e of the straight guide 6
b, 151c (only this is not shown) is replaced by a ring member 151, and the member 151 is rotatably held by the rectilinear guide 6, and the ring 151 is rotated after the extension from the retracted position is completed. Then, similarly to the other embodiments described above, the configuration may be such that 151a, 151b, 151c is engaged and held between the bayonet ring pressing plates 44, 45, 46 and the camera body 39.

(Correspondence of Claims and Embodiments) In the above embodiments, the first group lens, the second group lens, and the third group lens are provided in the variable power optical system described in the claims, and the first group cam ring is used. 5. The linear guide 6 transmits the driving force to the gear 47, and the bayonet ring 43 transmits the driving force to the positioning means according to the first or ninth aspect. A drive source (not shown) is a drive unit according to claim 1 or 12, a drive source (not shown) for transmitting a driving force to the gear 8 is an actuation unit described in the claims, and a camera body 39 is a claim. The positioning means according to claim 2 or 10, the projections 6c, 6d, 6e, or the projections 151a, 151b, 151c, the moving means according to claim 2 or 10, the projections 6c, 6d, 6e.
Drive means (not shown) for rotating the projections 151a, 151b,
The drive means (not shown) for rotating the 151c is provided in claim 2 or 13
And a helicoid shaft 36a (not shown) formed in the inner peripheral surface of the fixed lens barrel 38 which fits into the axial ridge 6f projecting from the outer peripheral surface of the linear guide 6. And 37a are provided on the outer peripheral surface of the rectilinear guide 6 on the outer peripheral surface of the linear guide 6 on the second guide means described in the claims, and on the outer peripheral surface of the linear guide 6 on the drive means described in claim 11 for transmitting a driving force to the gear 48. An axial groove (not shown) engraved on the inner peripheral surface of the fixed lens barrel 38 that fits with the formed axial ridge 6f is provided on the guide portion described in the claims.
36a, 37a is the shaft member described in the claims, gear 8,
50 corresponds to the driving force transmitting means described in the claims, and the coil spring 49 corresponds to the elastic means described in the claims.

〔The invention's effect〕

As described above, according to the present invention, it is possible to provide an optical device that can achieve downsizing, and has a simple configuration and can guarantee the positional accuracy of the variable power optical system in the optical axis direction with good operability.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a lens barrel portion of a camera having a lens barrel according to an embodiment of the present invention, FIG. 2 is a front view of a stepping motor mounted in the lens barrel, and FIGS. FIG. 5 is a cross-sectional view of the lens barrel in various states, FIGS. 6 and 7 are views for explaining collapsing and extension of the lens barrel, and FIGS. 8 and 9 are diagrams of the lens. 10 to 12 are explanatory views of another embodiment of the present invention, and FIGS. 13 to 16 are explanatory views of a retractable mechanism of a conventional zoom camera. . DESCRIPTION OF SYMBOLS 1 ... 1st group lens barrel, 2 ... 2nd group cam ring 3 ... Shutter base plate, 4 ... 3rd group holder 5 ... 1st group cam ring, 6 ... Straight guide 7 ... Gear, 8 ... Gear 9-11 ... Planting pin, 12-13 ... Guide Bar 15,16… Guide bar 18… Helicoid shaft, 35… Gear carrying plate 35a, 36b… Fixed shaft, 35c, 35d… Helicoid hole 36a, 37a… Helicoid shaft 36,37… Gear, 38… Fixed lens barrel 39… Camera Main unit, 40 ... Ring gear 43 ... Bayonet ring

Claims (23)

(57) [Claims] 1. A positioning means for positioning a guide means for guiding a variable power optical system for a variable power operation so as not to move in an optical axis direction, and a driving means for moving the positioning means to an operation position or a non-operation position. And an actuating means for moving the variable-magnification optical system guided by the guide means positioned so as not to move in the optical axis direction by the positioning means for a magnification operation. . 2. A positioning means for positioning a guide means for guiding a variable power optical system for a variable power operation so as not to move in the optical axis direction, and by moving the guide means to an operation position of the positioning means, A moving means for receiving the action of the positioning means, a driving means for moving the moving means to a working position or a non-working position of the positioning means, and positioning by the positioning means so as not to move in the optical axis direction. Operating means for moving the variable power optical system guided by the guide means for a variable power operation. 3. The optical device according to claim 1, wherein said positioning means positions said guide means at at least two places. 4. The variable magnification optical system guided by the guide means after the guide means is positioned so as not to move in the optical axis direction by the positioning means. The method according to claim 1, wherein the moving is performed.
4. The optical device according to 2 or 3. 5. The operating means moves the variable-magnification optical system to an initial photographing position guided by the guide means after the guide means is positioned by the positioning means so as not to move in the optical axis direction. Claim 1, characterized in that:
5. The optical device according to 2, 3, or 4. 6. An optical apparatus according to claim 1, wherein said guide means guides said variable power optical system for a zoom operation. 7. The optical device according to claim 1, wherein said optical device is a camera. 8. The optical device according to claim 1, wherein said optical device is a taking lens barrel. 9. A variable power optical system, first guiding means for guiding the variable power optical system for a variable power operation, and a feeding position of the variable power optical system and the first guiding means from a retracted position. And a positioning means for positioning the first guiding means guided to the extended position by the second guiding means by moving to the operating position so as not to move in the optical axis direction. Operating means for moving the variable power optical system guided by the first guide means positioned so as not to move in the optical axis direction by the positioning means for a variable power operation. Optical device. 10. A variable power optical system, first guide means for guiding the variable power optical system for a variable power operation, and a position where the variable power optical system and the first guide means are extended from a retracted position. Second guiding means, a positioning means for positioning the first guiding means guided to the feeding position by the second guiding means so as not to move in the optical axis direction, and an operation of the positioning means A moving means for causing the first guide means to receive the action of the positioning means by moving to a position; and a guide means for guiding the first guide means positioned so as not to move in the optical axis direction by the positioning means. Operating means for moving the variable power optical system for a variable power operation. 11. A driving mechanism for moving the variable power optical system guided by the second guide means and the first guide means from the retracted position to the extended position. 10. The optical device according to 10. 12. The optical device according to claim 9, further comprising a driving unit for moving the positioning unit to an operation position or a non-operation position. 13. The optical device according to claim 10, further comprising a driving unit for moving the moving unit to an operating position or a non-operating position of the positioning unit. 14. The optical device according to claim 9, wherein said positioning means positions said first guide means at at least two places. 15. An optical system according to claim 9, wherein said second guide means has a guide portion which allows only the linear movement of said first guide means in the optical axis direction. apparatus. 16. The apparatus according to claim 9, wherein said second guide means has a shaft member for transmitting a driving force for moving said first guide means from the retracted position to the extended position. An optical device according to any one of the above. 17. A drive for moving the variable-magnification optical system guided by the first guide means when the first guide means is positioned so as not to move in the optical axis direction by the positioning means. A driving force transmission system is connected to connect the driving force transmission system so that force is transmitted from the actuation unit, and the driving force transmission unit disconnects the driving force transmission system when the first guide is at the retracted position. An optical device according to any one of claims 9 to 16. 18. An optical device according to claim 17, wherein said driving force transmitting means has elastic means for connecting said driving force transmitting system. 19. The variable-magnification optical system guided by the first guide means after the first guide means is positioned by the positioning means so as not to move in the optical axis direction. 19. The optical device according to claim 9, wherein the optical device moves for a zooming operation. 20. The operating means is guided by the first guide means after the first guide means is positioned by the positioning means so as not to move in the optical axis direction. 20. The optical device according to claim 9, wherein the optical device is moved to a photographing initial position. 21. An optical apparatus according to claim 9, wherein said first guiding means guides said variable power optical system for a zoom operation. 22. The optical device according to claim 9, wherein said optical device is a camera. 23. The optical device according to claim 9, wherein said optical device is a taking lens barrel.