JP2000194046A - Optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an optical system in the case of housing by withdrawing a 1st lens unit in space made free by withdrawing a 2nd lens unit. SOLUTION: When a mode other than a photographing mode such as a power source turnoff mode or a reproducing mode is selected, a step motor is driven and a third group lens barrel is moved to a collapsing standby position (S111 and S112). Next, a DC motor is driven to move the lens barrel to a collapsible position, and then the photographing mode is finished (S113 and S114). At the time of starting photographing, a second group lens barrel is extended first, and then the third group lens barrel is driven to be extended to the space made free by extending the second group lens barrel. At the time of collapsing, the third group lens barrel is withdrawn to the collapsible position first, and then the second group lens barrel is driven to be withdrawn to the space made free by withdrawing the third group lens barrel. Thus, a distance between the lens barrels at the time of collapsing is made extremely small while avoiding the collision of the lens barrels, and the optical system in the case of housing is miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device such as a camera capable of moving an optical system between a use position and a storage position.

[0002]

2. Description of the Related Art Conventionally, in a camera in which a plurality of lens groups are moved in the optical axis direction to perform a zooming operation and a focusing operation, the non-photographing lens groups are stored in a camera body to be collapsed, and are carried. There are known ones adopting a form suitable for the following. Conventionally, an actuator such as a DC motor is used for the variable power operation for such driving, and another actuator such as a step motor is provided for the focus adjustment operation, and the variable power operation is used for driving to the retracted position. Are further driven and housed.

Further, a rear focus type lens system in which a focus adjusting lens is disposed behind a variable power lens is employed in this type of lens barrel.

[0004]

However, in the above-mentioned conventional camera, since the lens for focusing is provided even when the lens for zooming is collapsed, the space for the lens driving range for focusing is limited. At least there was a problem that the collapsible lens could not be collapsed and the miniaturization due to the collapsible lens could not be sufficiently achieved.

An object of the present invention is to provide an optical device that can sufficiently reduce the size of an optical system when housed.

[0006]

To achieve the above object, the present invention provides a first lens unit constituting an optical system, a first motor for driving the first lens unit, and an optical system. A second lens unit provided behind the first lens unit,
A second motor for driving the first lens unit; and a second motor for driving the second lens unit in response to a storage instruction of the optical system; and a first lens unit in a space made free by the second lens unit. Is an optical device having control means for controlling the first and second motors so that the second lens unit retracts after leaving the space.

Further, the present invention provides a first lens unit constituting an optical system, a first motor for driving the first lens unit, and a first lens unit constituting the optical system. A second lens unit provided at the rear, a second motor for driving the second lens unit, and the second lens unit retracted in response to a storage instruction of the optical system, the second lens unit The first and the second lens units are moved in such a manner that the first lens unit is retracted after the second lens unit has opened the space into a space that does not become a moving area in a use state when the first lens is opened by the unit. And an optical device having control means for controlling the second motor.

Further, the present invention provides a first lens unit constituting an optical system, a first motor for driving the first lens unit, and a first lens unit constituting the optical system. A second lens unit provided rearward, a second motor driving the second lens unit, and extending the first lens unit in response to an instruction to advance the optical system; An optical device comprising: control means for controlling the first and second motors so that the second lens unit is extended after the first lens unit has opened the space in a space which is opened by extending the unit. Is what you do.

Further, the present invention provides a first lens unit forming an optical system, a first motor for driving the first lens unit, and a first lens unit forming the optical system. A second lens unit provided rearward, a second motor driving the second lens unit, and extending the first lens unit in response to an instruction to advance the optical system; The first and second lens units are extended so that the second lens unit is extended after the first lens unit leaves the space in a space that does not become a movement area when the second lens unit is extended in use. And a control means for controlling the motor.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a lens barrel showing an embodiment of a camera embodying the present invention, FIGS. 2 to 4 are central sectional views, FIG. 2 is a retracted position, and FIG. Reference numeral 4 denotes a tele position.

Reference numeral 1 denotes a base which is a base of the lens barrel unit.
The lens barrel unit structure is formed together with the fixed barrel 2 fixed to the front end by screws. 3 is a first lens barrel,
The lenses 4, 5, and 6 are held. Three follower pins 7 each having a tapered portion at the end are press-fitted on the outer peripheral side surface, and a cap 8 is fixed to the front surface by bonding.

Reference numeral 9 denotes a two-unit lens barrel, and lenses 10, 11, 12
And is integrally held by the drawing base plate 14 of the drawing unit 13 by means such as bonding.

FIG. 5 is an exploded perspective view of the aperture unit 13.
Two follower portions 14a each having a tapered portion at the tip are integrally formed on the outer peripheral portion of the drawing base plate 14, and one movable follower 81 movable in the axial direction is provided, so that a total of three followers are provided. Are arranged equally.

The rear end of the movable follower 81 is pressed and urged by a leaf spring 82, whereby the mechanical gap is offset to maintain accuracy. Here, the movable follower 81 is provided at a position which is the highest when the camera is in the normal position among the three followers, whereby the direction of the one-sided movement and the direction of gravity are substantially the same, and the movable follower 81 has a small urging force. A sufficient biasing effect can be obtained, a space saving effect can be obtained, and a driving load can be reduced.

Reference numeral 83 denotes a coil wound around a bobbin.
A magnetic torque is generated in the magnet 87 formed integrally with the arm 86 via the arm 5.

Reference numerals 88 and 89 denote aperture blades, each of which has a linear elongated hole 88b-d and 89b-d,
It is slidably provided by being guided by four shafts 14b to 14e. Further, two shaft portions 86a and 86b provided on the arm portion of the arm 86 are provided with holes 88a of the blades 88 and 89, respectively.
89a.

Reference numeral 90 denotes a cap which holds and fixes the coil 83 and the yokes 84 and 85 between the base plate 14 and the arm 86 (and the magnet 87) so as to be rotatable. Reference numeral 91 denotes a case for preventing the blades 88 and 89 from falling off.

The aperture unit 13 is arranged on the inner periphery of a rectilinear guide cylinder 49 described later. For this purpose, the coil 83 and the magnet 86 which require a certain space in the unit are separately arranged on both sides of the optical axis, and in particular, the longitudinal direction thereof is made to coincide with the sliding direction of the blades 88 and 89, The arrangement is suitable for the inside of a cylindrical component such as the straight guide cylinder, thereby contributing to downsizing of the apparatus.

Reference numeral 15 denotes a third lens barrel holding a lens 16,
While being guided by the guide bars 17 and 18, the position in the axial direction is regulated by a nut 19 having a female screw held between its arms, and is biased by a tension spring 20 in the retraction direction. The projection 15a of the third lens barrel 15 is fitted in the slit 19a provided in the nut 19, and the rotation is restricted (FIG. 7).

Reference numeral 21 denotes a screw provided integrally with the magnet 22, and has a male screw portion screwed with the female screw portion of the nut 19. Reference numeral 23 denotes a bearing metal pressed into the base 1 and one end of the screw 21 is rotatably fitted.

Reference numeral 24 denotes a step motor for driving the third lens barrel. Two sets of a pair of yokes 25 and 26 and a coil 27 wound around a bobbin are linearly opposed to each other with the magnet 22 interposed therebetween. And fixed by screwing a yoke plate 28 onto the base 1 (FIG. 6).

In FIG. 7, reference numeral 29 denotes a photo interrupter fixed to the base 1 and a slit plate 30 integrally fixed to the third lens barrel 15 is disposed at a position where the slit plate 30 can advance and retreat in the slit portion of the photo interrupter. ing. Reference numeral 31 denotes a cap fixed to the base 1 and guide bars 17, 18
Is fixed, and the screw 21 is rotatably held.

Reference numeral 32 denotes an image sensor, which is fixed and held to a holding plate 33 fixed to the base 1 by screws. Reference numeral 34 denotes a flexible circuit for supplying the photoelectrically converted image signal to a signal processing circuit described later. Numeral 35 denotes dustproof rubber, and numeral 36 denotes a low-pass filter (LPF), both of which are fixed to the base 1 by adhesion or the like.

A drive ring 37 is rotatably fitted to the outer periphery of the fixed cylinder 2. The outer periphery of the drive ring 37 has a gear portion 37a in part. Reference numeral 38 denotes a DC motor. As shown in FIG. 8, a pinion gear 39 is integrally provided on the output shaft by press fitting or the like. The driving force of the motor 38 is, in order from the gear 39, the gears 40, 41, 42, 43, 44, 4
5 to the gear portion 37a of the drive ring 37.
These gears 40 to 45 are housed in gear boxes 46 and 47 and fixed to the base 1. The motor 38 is also fixed to the gear box 46.

A movable cam ring 48 is provided on the inner peripheral portion of the fixed cylinder 2.
Are fitted, and a straight guide cylinder 49 is fitted on the inner periphery thereof.

A drive pin 5 is provided on the outer periphery of the movable cam ring 48.
A follower pin 51 having zero and a tapered portion is planted in three equal parts, and the drive pin 50 penetrates the hole 2 a of the fixed cylinder 2 and fits into a groove 37 b provided on the inner peripheral side of the drive ring 37. I agree. The follower pin 51 has a tapered end portion in sliding contact with a tapered cam groove 2 b provided on the inner periphery of the fixed cylinder 2. FIG. 9 is an inner development view for explaining the above.

FIG. 10 is a developed view of the inner surface of the movable cam ring 48.
Tapered cam grooves 48a and 48b are provided on the inner periphery thereof,
A follower 7 provided on the first lens barrel 3 and a follower 14a (or 8) provided on the aperture base plate 14 are provided.
1) is in sliding contact.

At the same time, the side surfaces of the respective followers are fitted into the linear grooves 49a and 49b of the straight guide cylinder 49, and their positions in the rotation direction are regulated, so that the rotation of the first lens barrel 3 and the aperture unit 13 is prevented. Regulations are made to allow straight travel.

The front projection 49c on the outer peripheral portion of the straight guide cylinder 49 is in contact with the groove 48c on the inner periphery of the movable cam ring 48, and the rear flange portion 49d is connected to the end of the movable cam ring 48. The linear guide cylinder 49 is thereby restricted from moving relative to the movable cam ring 48 in the optical axis direction. At the same time, the rear projection 49e
Is fitted in the straight groove 2c on the inner periphery of the fixed cylinder 2 so as to be able to move straight, and the movement in the rotation direction is restricted.

As shown in FIGS. 1 to 6, in this embodiment, the stepping motor 24 is
6 are arranged at substantially the same height as the height of the stacked 6 and linearly developed along one side thereof, and a screw 21 and a magnet 22 are arranged near the center of the one side. Thus, the third lens barrel 15 can be made thin in a flat plate shape, and cylindrical parts such as the moving cam ring 48 and the linear guide cylinder 49 can be arranged close to each other, so that the size of the apparatus can be reduced.

The guide bars 17 and 18 and the screw 21 are moved around the aperture unit and the moving cam ring 48 by aligning the longitudinal direction of the aperture unit 13 with the longitudinal direction of the step motor 24. It can be arranged in an empty space inside, thereby shortening the overall length of the device when collapsed as shown in FIG.

In FIGS. 1 to 4, a cap 52 holds a dust-proof sheet 53 between the cap and the fixed cylinder 2, and has rail portions 52 a and 52 b on its front surface for guiding a barrier 54 described later. A dustproof sheet 55 is also inserted into the groove 48c of the movable cam ring 48.

A linear sensor 56 is fixed to the base 1 by screws or the like. The circuit configuration is a variable resistor as shown in FIG. 11A, and when a predetermined voltage is applied between terminals 1 and 3, the slider 56a slides,
The output of the terminal 2 changes linearly as shown in FIG. Reference numeral 57 denotes a lever for holding the slider 56a between the arms 57a, and is guided by a guide bar 58. The lever 57 has a follower portion 57b having a tapered portion at the tip, and the side surface thereof is fitted into the groove 1a of the base 1.
Reference numeral 59 denotes a spring for biasing the lever. FIG. 12 is a front view of this part.

FIG. 13 is a development view of the outer surface of the drive ring 37.
The follower portion 57b of the lever is in sliding contact with the linear cam groove 37c. 37d and 38e are tapered cam grooves for driving a finder lens (not shown) for zooming.
60 is a follower unit provided integrally with a compensator lens (not shown), and 61 is a variator lens (not shown).
Are provided integrally with the cam grooves 37d and 37e.

In FIG. 1 and FIG. 14, the barrier 54 is rotatably supported about a shaft 63 erected on the barrier base 62, and is viewed from the front of the apparatus by a closing spring 64 hung on a hook portion 54a. Energized clockwise. Reference numeral 65 denotes a barrier drive lever, which is rotatably supported about a shaft 66 erected on the barrier base 62, and which is urged clockwise by an open spring 67 hooked on the hook 65a. Here, the urging forces of the two springs are set as "close spring 64 << open spring 67". Also,
A shaft 68 is erected at one end of the barrier drive lever 65 at a position corresponding to one side surface of the barrier 54. Reference numeral 69 denotes a leaf switch provided by integral molding, which is fixed to the barrier base 62 by screws. Barrier base 62 is base 1
Is fixed with screws.

FIG. 14A shows a state in which the barrier is closed, and the stepped portion 37f of the drive ring 37 presses the barrier drive lever 65 against the bent portion 65b to open the spring 6.
7 and is locked in a state where it is rotated in a counterclockwise direction against the urging force of No. 7. The barrier 54 rotates in the closing direction by the urging force of the closing spring 64, and the bent portion 54b
Abuts on the stopper portion 2d of the second member and is in a closed state.

FIG. 15 is a block diagram showing the electrical connection of a camera embodying the present invention. The lens barrel 71 has been described above, and the components included in the figure are given the same numbers as above.

The image signal photoelectrically converted by the image pickup device 32 is subjected to predetermined processing such as color conversion and gamma processing by a signal processing circuit 72 and then recorded in a memory 73 such as a card medium.
The control unit 74 controls the entire camera, and monitors the output of the linear sensor 56, the photo interrupter 29, the leaf SW 69, and the like inside the lens barrel, and
4. It controls the DC motor 38 and the aperture unit 13, and also performs the above signal processing and memory control.

Reference numeral 75 denotes an electrically erasable and recordable nonvolatile memory, for example, an EEPROM or the like.

Reference numeral 76 denotes a mode dial switch, which can switch and set various function modes such as power-off, photographing mode, reproduction mode, and PC connection mode.

The operation of the above configuration will be described below.

When the DC motor 38 is driven, the drive ring 37 rotates via the gears 39 to 45 as described above (FIG. 8). The drive pin 50 of the movable cam ring 48 that penetrates the hole 2a of the fixed cylinder 2 fits into a linear groove 37b formed along the optical axis in the inner periphery of the drive ring 37. The rotation of the ring 37 rotates the movable cam ring 48 via the drive pin 50, but since the follower pin 51 of the movable cam ring 48 is fitted in the cam groove 2 b of the fixed cylinder 2, the movable cam ring 48 is It also moves in the optical axis direction along the second cam 2b (FIG. 9).

When the movable cam ring 48 moves in the optical axis direction,
The rectilinear guide cylinder 49 also moves integrally in the optical axis direction, but moves only in the optical axis direction without rotating because the outer circumferential projection 49e is restricted by the fixed cylinder groove 2c.

When the movable cam ring 48 rotates, the first lens barrel 3
And the second group barrel 9 fixed to the aperture unit 13 relatively moves in the optical axis direction along the grooves 49a and 49b of the rectilinear guide cylinder according to the lift of the cams 48a and 48b of the movable cam ring 48 ( (FIG. 10).

FIGS. 16A and 16B show only the locus of the cam portion. FIG. 16A shows the cam of the fixed cylinder 2, and FIG.
(C) is a second group cam of the movable cam ring 48. (D) is the movement trajectory of the first lens barrel, which is the sum of (a) and (b), and (e) is the movement trajectory of the second lens barrel, which is the sum of (a) and (c).

W on the horizontal axis is a wide position, T is a tele position, and S is
Denotes a retracted position (storage position), and each cam has a flat area from the retracted position S to a position indicated by B. In this way, by driving the DC motor 38, switching between the retracted position and the photographable position (S to W) and the zoom operation (W to T) in the photographing range (use position) are performed.

When the driving ring 37 rotates, the finder lens (not shown) moves in the optical axis direction along the cams 37d and 37e via the followers 60 and 61 as described above, and interlocks with the zoom operation of the lens barrel. I do.

At the same time, the lever 57 moves in the optical axis direction along the cam 37c to displace the slider 56a of the linear sensor 56 and change its output as shown in FIG. By detecting this output, the zoom position can be sequentially detected.

As shown in FIG. 16 (d), the first lens barrel 3 draws a locus of reciprocating movement convex to the image side between the wide position W and the telephoto position T. Therefore, by making the three cams non-linear between the wide position W and the tele position T, the gradient of each cam can be suppressed low, and the driving load can be reduced. Further, the fixed cylinder 2 shown in FIG.
And the first cam of the movable cam ring 48 shown in FIG. 16B are provided so as to have a maximum value between the collapsed and wide positions, so that the extension amount of the first lens barrel 3 can be increased by the two cams. (A) and (b), the total length of the fixed cylinder 2 and the movable cam ring 48 can be shortened, and the apparatus can be downsized.

As shown in FIG. 14A, the step 37f of the drive ring 37 locks the barrier drive lever 65b when the drive ring 37 is retracted. Accordingly, the locking is released, and the barrier drive lever 65 is rotated clockwise by the urging force of the opening spring 67 to press the side surface of the barrier 54 via the shaft 68.

As described above, since the urging force of the closing spring 64 is weaker than the urging force of the opening spring 67, the barrier 54 is rotated counterclockwise to the open state shown in FIG. 14B. At this time, the bent portion 54b of the barrier 54 is
Is pressed, and the switch is turned on. The opening and closing operations of the barrier 54 are set to be completed in the flat areas of the respective cams shown in SB in FIG.

When the step motor 24 is driven, the screw 21 rotates via the magnet 22. Nut 1
9 moves in the optical axis direction because it is regulated by the projection 15a of the third lens barrel 15 as described above, and the third lens barrel 15 moves in the optical axis direction following the movement, thereby performing focus adjustment. Third group lens barrel 15
The slit plate 30 enters or retracts into the slit portion of the photointerrupter 29 to switch its output within the range of the operation stroke, and the counter of the step motor 24 is reset at this time.

FIG. 17 is a flowchart showing the operation of the camera. FIG. When the photographing mode is selected by the mode dial 76 (s101), the control unit determines from the output of the linear sensor whether the zoom position of the lens barrel unit is the retracted position or the wide-telephoto photographable position. (S102).

When the position is wide to tele, s10
Go to 7. If it is in the retracted position, the DC motor 38 is driven by a predetermined amount in the feeding direction in s103. The predetermined amount is an amount corresponding to S to B in FIG. 16 described above. Here, the zoom drive is temporarily stopped, and it is detected whether or not the leaf switch 69 is on (s104). When the switch is off, it is considered that an error has occurred, a process such as displaying a warning is performed, and further zoom drive and subsequent drive of the step motor 29 are not performed (s105). The lens barrel is driven and the lens barrel is extended to the wide position (s106).

When the extension of the lens barrel to the wide position by the zoom drive is completed, the step motor 24 is driven in the direction of the switching position of the photointerrupter 29 (s1).
07). If the switching of the photo interrupter 29 can be detected, the drive of the step motor 24 is stopped at that position and the count is reset (s108). If the count cannot be detected for any reason, a warning is displayed as an error has occurred, At the same time, further driving of the step motor 24 and driving of the zoom are prohibited (s109). When the reset operation is completed, the step motor 24 is driven to a standby position at which the focus operation is started, and a standby state in which photographing is possible (s110).

FIG. 17B shows the state at the end of the photographing mode.
When a mode other than the photographing mode such as the power-off or the reproduction mode is selected by the mode dial 76 (s111), first, the step motor 24 is driven to move the third lens barrel 15 to the collapsing standby position (collapse completing position) (s112). ). This position is adjusted in advance in the manufacturing process for each camera individually, and is stored in the nonvolatile memory 75 as a count amount from the position where the counter of the step motor 24 is reset. Then DC
The lens barrel is moved to the retracted position by driving the motor 38 (s11).
3), end the shooting mode (s114).

The state at this time is as shown in FIG. 2 as described above. In the present embodiment, as shown in FIGS. 2 to 4, the drive stroke of the third lens barrel 15 in the photographable position (in use state) is such that the second group lens barrel 9 shown in FIG. It overlaps with the collapsed position that does not become the movement area.

As described above, at the start of photographing,
The third lens barrel 9 is extended, and then the third lens barrel 15 is extended and driven into the space vacated by the second lens barrel 9 being extended. When retracted, the third lens barrel 15 is first retracted to the retracted position. Since the second group barrel 9 is controlled so as to be driven into the space vacated by the third group barrel 15 being retracted, the distance between the barrels during collapse is extremely reduced while avoiding collision between these barrels. The size of the optical system can be reduced when the optical system is housed.

At the same time, if a problem occurs in the reset operation of the third lens barrel 15, the driving of the DC motor 38 and the driving of the step motor 24 are prohibited, so that damage to the equipment can be avoided.

In general, the switching position of the photointerrupter has many individual variations, but by storing the collapsing standby position in the memory as described above, the third group lens barrel 15 is extremely small while avoiding collision with the base 1. Can be stored at intervals.

(Correspondence of the Invention to the Embodiment) In the above embodiment, the second lens barrel 9 is used as the first lens unit of the present invention, the DC motor 38 is used as the first motor of the present invention, and
The group lens barrel 15 serves as the second lens unit of the present invention, the stepping motor 24 serves as the second motor of the present invention, the control unit 74 serves as the control means of the present invention, and the photo interrupter 29 serves as the position detecting means of the present invention. And the non-volatile memory 75 correspond to the non-volatile memory of the present invention.

The correspondence between the components of the present invention and the components of the embodiments has been described above. However, the present invention is not limited to the configurations of the embodiments, and the functions described in the claims or It goes without saying that any configuration may be used as long as the function of the configuration of the embodiment can be achieved.

In the present invention, the above embodiments and modifications, or their technical elements may be combined as necessary.

The present invention is also applicable to various forms of cameras such as single-lens reflex cameras, lens shutter cameras,
Furthermore, optical devices and other devices other than cameras, furthermore, those cameras, optical devices, and other devices, and devices applied to those cameras, optical devices, and other devices, or elements that constitute them Can be applied.

The present invention is such that the whole or a part of the configuration of the claims or the embodiments forms one device and is combined with another device. Or it may be something like an element constituting the device.

[0067]

As described above, according to the present invention,
It is possible to provide an optical device capable of sufficiently reducing the size of the optical system when housed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a lens barrel of a camera embodying the present invention.

FIG. 2 is a central sectional view of the lens barrel of FIG. 1 (retracted position).

FIG. 3 is a center sectional view (wide position) of the lens barrel in FIG. 1;

FIG. 4 is a central sectional view of the lens barrel shown in FIG. 1 (telephoto position).

FIG. 5 is an exploded perspective view of the aperture unit of FIG. 1;

FIG. 6 is an exploded perspective view of the step motor unit shown in FIG. 1;

FIG. 7 is a front view of a third-group barrel driving unit in FIG. 1;

FIG. 8 is a view showing a zoom drive gear train shown in FIG. 1;

FIG. 9 is an inner developed view of the fixed cylinder of FIG. 1;

FIG. 10 is an inner developed view of the moving cam ring of FIG. 1;

FIG. 11 is a characteristic diagram of the linear sensor of FIG. 1;

FIG. 12 is a front view around the linear sensor of FIG. 1;

FIG. 13 is an external development of the drive ring of FIG. 1;

FIG. 14 is an explanatory view of the barrier opening / closing mechanism of FIG. 1;

FIG. 15 is a block diagram showing an electrical configuration of the camera shown in FIG. 1;

FIG. 16 is a diagram illustrating the trajectory of the cam and the lens barrel of FIG. 1;

FIG. 17 is a flowchart showing a driving sequence of the lens barrel in FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base 2 fixed barrel 3 first-group barrel 9 second-group barrel 13 aperture unit 15 third-group barrel 24 step motor unit 32 image sensor 37 drive ring 38 DC motor 48 moving cam ring 49 straight guide cylinder 54 barrier 56 linear sensor

Claims (22)

[Claims] 1. A first lens unit that forms an optical system, a first motor that drives the first lens unit, and a first lens unit that forms the optical system are provided behind the first lens unit. A second lens unit and the second lens unit;
A second motor for driving the first lens unit; and a second motor for driving the second lens unit in response to a storage instruction of the optical system; and a first lens unit in a space made free by the second lens unit. Control means for controlling the first and second motors so that the second lens unit is retracted after the second lens unit leaves the space. 2. The apparatus according to claim 1, further comprising: a position detection unit configured to detect a reference position of the second lens unit, wherein the control unit is configured to detect the reference position of the second lens unit when the position detection unit cannot detect the reference position of the second lens unit. The optical device according to claim 1, wherein driving of the first motor is prohibited. 3. A position detecting means for detecting a reference position of the second lens unit, wherein the control means, when the position detecting means cannot detect the reference position of the second lens unit, 3. The optical device according to claim 1, wherein driving of the second motor is prohibited. 4. A position detecting means for detecting a reference position of the second lens unit, and information on a movement amount from the reference position detected by the position detecting means to a storage position of the second lens unit. A rewritable nonvolatile memory for storing, wherein the control means controls the second motor so as to retract the second lens unit into a storage position according to the information stored in the nonvolatile memory. The optical device according to claim 1, wherein: 5. The optical device according to claim 4, wherein the information on the movement amount stored in the nonvolatile memory is set for each of the optical devices. 6. The optical device according to claim 1, wherein the first lens unit is a lens for zooming. 7. The lens system according to claim 1, wherein the second lens unit is a lens for focusing.
The optical device according to any one of the preceding claims. 8. The optical device according to claim 1, wherein the first motor is a DC motor. 9. The optical device according to claim 1, wherein the second motor is a step motor. 10. The optical device according to claim 1, wherein the optical device is a camera. 11. The optical device according to claim 1, wherein the optical device is a lens barrel. 12. A first lens unit that forms an optical system, a first motor that drives the first lens unit, and a rear part of the first lens unit that forms the optical system. A second lens unit, a second motor for driving the second lens unit, and the second lens unit in response to an instruction to store the optical system, wherein the second lens unit is retracted. The first and second motors are driven such that the first lens unit is retracted into a space that does not become a movement area in the use state after the second lens unit has opened the space. An optical device, comprising: control means for controlling. 13. A first lens unit that forms an optical system, a first motor that drives the first lens unit, and a rear part of the first lens unit that forms the optical system. A second lens unit, a second motor for driving the second lens unit, and an extension of the first lens unit in response to an instruction to advance the optical system, wherein the extension of the first lens unit is performed. Control means for controlling the first and second motors so that the first lens unit draws out the second lens unit in the space to be opened after the first lens unit has opened the space. . 14. The apparatus according to claim 1, further comprising: position detecting means for detecting a reference position of the second lens unit, wherein the control means is configured to detect the reference position of the second lens unit when the position detecting means cannot detect the reference position of the second lens unit. 14. The optical device according to claim 13, wherein driving of the first motor is prohibited. 15. A control device comprising: a position detecting unit that detects a reference position of the second lens unit; wherein the control unit is configured to detect the reference position of the second lens unit when the position detecting unit cannot detect the reference position of the second lens unit. 15. The optical device according to claim 13, wherein driving of the second motor is prohibited. 16. The optical device according to claim 13, wherein the first lens unit is a variable power lens. 17. The optical device according to claim 13, wherein the second lens unit is a lens for focusing. 18. The optical device according to claim 13, wherein the first motor is a DC motor. 19. The optical device according to claim 13, wherein the second motor is a step motor. 20. The optical device according to claim 13, wherein the optical device is a camera. 21. The optical device according to claim 13, wherein the optical device is a lens barrel. 22. A first lens unit that forms an optical system, a first motor that drives the first lens unit, and a rear part of the first lens unit that forms the optical system. A second lens unit, a second motor for driving the second lens unit, and an extension of the first lens unit in response to an instruction to extend the optical system, wherein the extension of the first lens unit is performed. The first and second motors are controlled such that the second lens unit is extended to a space that does not become a movement area when the first lens unit is in use, after the first lens unit has opened the space. An optical device, comprising: