JPH0511310A - Photographing lens barrel device for camera provided with lens barrier - Google Patents

Abstract

PURPOSE:To reduce the number of parts, to reduce cost, to save space and to make a device compact without adversely affecting the accuracy of an optical position and the driving system of a photographing lens. CONSTITUTION:A driving lens barrel 3 and a base lens barrel 4 telescopically move in an optical axis direction by respectively different feeding amount by the screw action of a 1st lead gear 16 which receives the driving force of a 1st motor 10 through a transmission system and a lead screw 19 and the screw action of a 2nd lead nut gear 17 and a lead screw 20. In a housed state, the base lens barrel gets into the driving lens barrel 3, so that an opening/closing driving laver 112 is turned by the inclined cam surface 3c of the ring frame body 3a and a lens barrier 115 is closed with the turning. When this state is changed to a photographing state, the lever 112 releases the restriction of the inclined cam surface 3c, so that it is turned by the screw action in a reverse direction and the lens barrier 115 is opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera provided with a lens barrier widely used in, for example, a conventional camera using a photosensitive film or a so-called electronic camera using a CCD, as well as a video camera used in various fields. The present invention relates to an improvement of the taking lens barrel device.

[0002]

2. Description of the Related Art Recently, a camera having a lens barrier provided on the front surface of a taking lens barrel has been widely used instead of a detachable lens cap, and various techniques relating to this have been disclosed.

For example, Japanese Patent Laid-Open No. 63-
Japanese Patent Laid-Open No. 199332 discloses a taking lens barrel apparatus of a type in which a lens barrier opening / closing operation is performed in relation to a finder barrier opening / closing operation in a variable focus lens type camera.

This photographing lens barrel device is basically
It consists of a lens barrel that moves to the film side when realizing the first focal length of the taking lens, and moves to the subject side when realizing the second focal length, a viewfinder barrier made of a plate-like member, and two blade members. The lens barrier, the cam member that has a cam surface inclined with respect to the optical axis direction, and moves in a predetermined direction in conjunction with the viewfinder barrier, and the viewfinder when the lens barrel achieves the first focal length. The lens barrier may be moved to its closed position side in conjunction with the movement of the barrier to its closed position, while the lens barrier may be moved to its open position side in conjunction with the action of moving the viewfinder barrier to its open position. A first drive means,
When the finder barrier is in the closed position, the lens barrel is retracted to the film side, while at least when the lens barrel is on the side that achieves the second focal length, the lens barrier cooperates with the cam surface of the cam member. And a second driving means for moving the lens barrier to its closed position.When the lens barrier is opened, the viewfinder barrier placed in the non-photographing state (closed state) is moved to the right to move the cam member. When the lens barrier is closed, the finder barrier is first moved to the left and the cam member is moved downward. Then, the second drive means shifts the taking lens barrel device from the wide-angle photographing state to the telephoto photographing state, drives the lens barrel to the film side, and uses the operation of the lens barrel to close the lens barrier. There is.

That is, in this taking lens barrel device,
Move the viewfinder barrier to the right from the non-shooting state,
The urging force of the tension spring applied to the lens barrier itself is operated to rotate the lens barrier to the open position so that the front of the taking lens is opened.
From the telephoto mode, move the viewfinder barrier to the left to move the lens barrel to the film side, and in the process of this movement, rotate the lens barrier to the closed position against the biasing force of the tension spring. The front of the taking lens is closed.

Further, in Japanese Patent Laid-Open No. 63-239430, a drive system from a motor as a drive source to a movable lens barrel (photographing lens) is divided into two parts by using two gears, and one of them is branched. System to drive the movable lens barrel and the other branch drive system to open and close the lens barrier. Further, a sliding clutch mechanism using a friction spring in the branch drive system to drive the movable lens barrel. There is disclosed a technique in which the movable lens barrel is stopped at a predetermined position (a position where it abuts on the protrusion) with the intervention of, and the lens barrier is opened and closed by the action of the slip clutch mechanism.

[0007]

However, in the technique disclosed in Japanese Patent Laid-Open No. 63-199332, the operation of moving the finder barrier to the right and left is used as the drive source for opening and closing the lens barrier. Therefore, an interlocking mechanism from the finder barrier to the cam member and a member such as a spring for returning the cam member to the free state position are necessary, and this increase in parts is disadvantageous in terms of space and cost. Was the cause of causing.

Further, in the technique disclosed in Japanese Patent Laid-Open No. 63-239430, the stopping operation of the movable lens barrel at a predetermined position and the opening / closing operation of the lens barrier are serially connected in time series, and the entire operation time is reduced. In addition to lengthening the length, there is a major drawback that the drive system of the taking lens may be damaged when the operation of the slip clutch mechanism becomes uncertain.

As one of the lens barrier opening / closing means, a lens barrier opening / closing means for opening / closing the lens barrier by using a member for directly holding the photographing lens, for example, a lens holding frame member can be considered. Since the member that directly holds the taking lens is not so strong in strength in general, and is a member that requires delicate precision in terms of optics, it is necessary to use such a high precision member. Performing the opening / closing operation of the lens barrier causes a risk of being significantly disadvantageous in terms of maintaining accuracy.

As described above, the conventional techniques have a problem that the opening / closing structure of the lens barrier is complicated, it is disadvantageous in terms of maintaining accuracy, and the driving system of the photographing lens is adversely affected. Therefore, the emergence of the improvement measure was strongly desired.

The present invention has been made in view of such circumstances, and has a smaller number of constituent parts than the conventional device of this type and is robust enough not to cause a problem in maintaining accuracy, and further, An object of the present invention is to provide a photographic lens barrel device for a camera, which is provided with a lens barrier having a new structure that does not adversely affect the drive system of the photographic lens.

[0012]

In the present invention, such an object includes (A) a first lens group and a second lens group which are arranged so as to be movable relative to each other along the same optical axis. A shooting lens barrel device for a camera with a built-in shooting optical system
Telescopic compound mirror divided into a lens barrel main body part which is attachable to a camera or constitutes a part of the camera, and at least two partial lens barrels called a first partial lens barrel and a second partial lens barrel. (B) The first partial lens barrel and the second partial lens barrel described above are movable relative to each other along the optical axis of the photographing optical system, and at least in one non-photographing state The lens barrel (for example, the first partial lens barrel) is configured so that it can be housed in the internal space of the other partial lens barrel (for example, the second partial lens barrel), and (C) the above-mentioned lens barrel main body portion,
The first partial lens barrel and the second partial lens barrel are supported so as to be movable relative to each other along the optical axis, and at least in the non-photographing state, these two partial lens barrels can be housed in their own internal spaces simultaneously or sequentially. (D) The first partial lens barrel located at the head of the above-mentioned photographing lens barrel device is configured to be capable of holding at least the first lens group in a fixed manner, and the photographing optical system (first An openable lens barrier means configured to shield the space on the object side of the lens group) from the outside world is installed in the first partial lens barrel, and (E) the first partial lens barrel and the lens barrel main body portion. The second partial lens barrel located between the above-mentioned second partial lens barrel is configured to be housed in the internal space of the lens barrel main body portion at least in a non-photographing state, and the inside of the above-mentioned openable lens barrier means. Lens barrier to open and close the lens barrier (F) This lens barrier opening / closing means closes the above-mentioned lens barrier when the first partial lens barrel is driven to the state position during non-photographing, and the first partial lens barrel is not closed during non-photographing. This is achieved completely by the configuration in which the lens barrier can be opened when it is driven from the state position to the object side.

[0013]

The opening / closing operation of the lens barrier in the taking lens barrel device for a camera according to the present invention is performed as follows. That is, a taking lens barrel device for a camera, which has at least a telescopic compound barrel that is divided into at least a barrel body portion, a first partial barrel and a second partial barrel, is extended telescopically during photography. It is provided so that it can be moved relative to each other in the use position in the closed state and in the retracted position in the telescopic type when not photographing, and at least the first partial lens barrel is moved from the retracted position (non-imaging position) to the use position. When the relative movement starts, the lens barrier of the retractable lens barrier means is opened in association with the operation of widening the relative distance between the first partial lens barrel and the second partial lens barrel on the optical axis, and
At least when the first partial lens barrel has finished moving relative to the storage position (non-photographing position) from its use position, it is possible to reduce the relative distance between the first partial lens barrel and the second partial lens barrel on the optical axis. It is designed to work together to forcibly close the lens barrier.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the illustrated embodiments in which the present invention is applied to a taking lens barrel device for a camera mounted on a variable focus type camera.

FIG. 1 is a schematic configuration diagram showing a schematic configuration of a photographic lens barrel apparatus for a camera according to the present invention, showing a state in which a photographic optical system is extended to a position for photographing.
FIG. 2 is a schematic configuration diagram showing a state when the photographing optical system is moved from the extended position in FIG. 1 to the stored position. Further, FIG. 3 is a block diagram schematically showing a control system of the taking lens barrel device.

In each drawing, reference numeral 1 denotes a taking lens barrel device, which is a front lens group L1 as a first lens group having a positive refractive power and sequentially arranged from the field and a first lens group having a negative refractive power. It is configured as a lens barrel device having a built-in photographing optical system L including a rear lens group L2 as a second lens group.

In this case, in the illustrated embodiment, the photographing optical system L is configured as, for example, a rear focus type continuous variable magnification optical system or a step variable magnification optical system. For example, the more specific configuration of the photographing optical system L is as follows (1) to (4)
Designed as described in.

(1) In the case of zooming, the rear lens group L
In the state accompanied by 2, the front lens group L1 is moved to the object side from the reference position to a position corresponding to the variable magnification at that time and stopped at that position.

(2) When focusing, the front lens group L
In the state where 1 is kept at the position after the movement, only the rear lens group L2 is moved from the position after the movement to the film surface side.
The amount of movement of the rear lens group L2 at this time is determined by the axial distance between the lens groups L1 and L2 corresponding to the variable power at each time and the amount of movement of the rear lens group L2 required for focusing. The amount of movement is set in advance as a value to be realized.

(3) When the front lens group L1 and the rear lens group L2 are located closest to the film side as shown in FIG. Sometimes referred to as "time"), both lens groups L1,
The position at which L2 is slightly moved from this position to the object side is the position at the wide end (shortest focal length), and both lens groups L
In the process in which 1 and L2 move from the position at the wide end to the object side while maintaining a predetermined axial distance, a zooming action is performed that changes from wide (short focal length) to tele (long focal length). Then, when the front lens group L1 and the rear lens group L2 move to the positions shown in FIG. 1, the telephoto end (longest focal length) is reached.

(4) Front lens group L1 during zooming
The axial distance between the rear lens group L2 and the rear lens group L2 changes so as to be widest at the wide end and narrowest at the tele end.

It is assumed that the taking optical system in this embodiment is constructed so as to realize the zooming action and the focusing action by performing the above-mentioned movements.

Numerals 2 to 4 are fixed mirrors configured as a tubular member having a triple structure so as to be movable relative to each other along a photographing optical axis (hereinafter, simply referred to as "optical axis") O and capable of telescopic expansion and contraction. The barrel, the drive barrel and the base barrel.

In this case, the fixed lens barrel 2 is provided so as to be located at a position closest to the film surface side as the lens barrel main body portion of the taking lens barrel device 1, and is also driven as the second partial lens barrel. The lens barrel 3 is provided as an intermediate lens barrel inside the fixed lens barrel 2 so as to be able to move linearly relative to the fixed lens barrel 2 in the front-rear direction, and has a ring frame body 3a described later at its rear end. Is configured to have.

Further, a barrier opening / closing cam 3b as a fixed cam portion having an inclined cam surface 3c facing the object side is formed on the inner peripheral portion of the ring frame 3a. The barrier opening / closing cam 3b will be described in detail in the section of the lens barrier mechanism 110.

The base lens barrel 4 as the first partial lens barrel
Is provided as the frontmost lens barrel so as to be capable of linearly moving relative to the driving lens barrel 3 in the front-rear direction inside the driving lens barrel 3. Further, a barrier drive shaft fitting for supporting a barrier drive shaft 111 of a lens barrier mechanism 110 described later so as to be rotatable and not to move in the optical axis O direction is fitted to the rear end wall of the base barrel 4. The hole 4a is formed.

A front group frame 5 for holding the front group lens group L1 is fixedly mounted inside the field of the base barrel 4.

Reference numeral 6 denotes a rear group frame which is a movable lens group holding frame for holding the rear group lens group L2, and is provided inside the film surface side of the base barrel 4 so as to be able to move straight forward and backward along the optical axis O. ing. That is, the front group frame 5 (base lens barrel 4
And the rear group frame 6 are configured as a lens holding frame having a structure capable of changing the axial distance thereof.

A mechanism for linearly guiding the drive lens barrel 3 in the fixed lens barrel 2, a mechanism for linearly guiding the base lens barrel 4 in the drive lens barrel 3, and a rear group frame in the base lens barrel 4. As a mechanism for guiding the 6 straight ahead, an appropriate linear guide mechanism known per se is used, for example, a linear guide mechanism using a pole member and a slide member (neither is shown).

Reference numeral 10 denotes a reversible rotary type first motor for driving the drive barrel 3 and the base barrel 4 in the front-rear direction along the optical axis O. For example, a DC motor having a core is provided in the fixed barrel 2. An integrated control unit 1 which is provided at an appropriate location and will be described later
It is configured to be digitally controlled by 03. In this case, it is assumed that the drive lens barrel 3 and the base lens barrel 4 move to the subject side when the first motor 10 rotates in the forward direction, and move to the film surface side when rotating in the reverse direction.

Reference numeral 11 is a first drive gear fixedly attached to the output shaft of the first motor 10.

Reference numeral 12 denotes a drive shaft (hereinafter referred to as a "small judgment surface drive shaft") which is rotatably provided in parallel with the optical axis O inside the fixed lens barrel 2, for example, and is orthogonal to the longitudinal direction thereof. The shape of the cross section is 2
It is formed in an almost oval shape with the parts cut in parallel planes.

Reference numeral 13 denotes a first driven gear fixedly attached to the rear end (the end on the film surface side) of the small judgment surface drive shaft 12.

Reference numeral 14 denotes a drive transmission gear having a fitting hole (hereinafter referred to as "small judgment surface hole") having the same opening shape as the cross-sectional shape of the small judgment surface driving shaft 12, which is the opening shape of the small judgment surface hole. Due to the cooperation with the cross-sectional shape of the surface drive shaft 12, the small drive surface drive shaft 12 is connected so as to be integrally rotatable and relatively movable in the optical axis direction.

The drive transmission gear 14 is rotatably provided on the periphery of the ring frame 3a of the drive lens barrel 3 by itself, and further, the gear holding member 15 provided on the ring frame 3a is used for the optical axis. It is configured so that it cannot move in any direction. The drive transmission gear 14 is configured to mesh with the first lead nut gear 16 and mesh with the second lead nut gear 17 via an intermediate gear (not shown) as described later.

The first lead nut gear 16 is a gear having a female lead screw which can be screwed with a fixed lead screw 19 which will be described later, on the inner peripheral surface thereof, so as to directly mesh with the drive transmission gear 14. The gear restraining member 1 is rotatably provided in the peripheral portion of the ring frame body 3a and is provided on the ring frame body 3a in the same manner as the drive transmission gear 14.
It is configured so that it cannot move in the optical axis direction by 5.

Therefore, when the small judgment surface drive shaft 12 is rotated in the forward and reverse directions, the first lead nut gear 16
Is rotated on the ring frame 3a of the driving lens barrel 3 and the driving lens barrel 3 including the ring frame 3a is linearly moved forward and backward along the optical axis O by the lead action of the fixed lead screw 19. Become.

The second lead nut gear 17 is a second lead nut gear having an inner peripheral surface having a female lead screw capable of being screwed with a moving lead screw 20 which will be described later, and is provided on the ring frame 3a of the drive lens barrel 3. In the peripheral portion substantially symmetrical to the first lead nut gear 16 in the above, it is rotatably provided by itself, and further cannot be moved in the optical axis direction by another gear restraining member 15 'provided on the ring frame 3a. Is configured. In this case, the second lead nut gear 17
Is configured to mesh with the drive transmission gear 14 described above via an appropriate gear train (not shown).

Therefore, when the small judgment surface drive shaft 12 is rotated in the forward and reverse directions, this second lead nut gear 17 is used.
Rotates on the ring frame 3a of the drive lens barrel 3 and moves the base lens barrel 4 including the moving lead screw 20 rectilinearly in the front-rear direction along the optical axis O by the lead action of the moving lead screw 20 described later. It will be.

The direction of the lead propulsion force generated between the fixed lead screw 19 and the first lead nut gear 16 is as follows.
Also, the moving lead screw 20 and the second lead nut gear 1
The direction of the reed propulsion action generated between the drive lens barrel 3 and
It is assumed that it is set in advance so that the base lens barrel 4 moves straight in the direction of the field.

Reference numeral 21 denotes a reversible rotation type second motor for driving the rear group frame 6 in the front-rear direction along the optical axis O. As in the case of the first motor 10 described above, for example, a D having a core is used.
It is provided as a C motor at an appropriate place in the base lens barrel 4,
It is configured to be digitally controlled by a general control unit 103 described later. In this case, when the second motor 21 rotates in the forward direction, the rear group frame 6 moves in the film plane direction within the base barrel 4.

Reference numeral 22 is a second drive gear fixedly attached to the output shaft of the second motor 21.

Reference numeral 23 is a rear group lead screw rotatably provided below the inside of the base lens barrel 4, and has a second driven gear 24 meshing with the second drive gear 22 at the end on the object side thereof. It is fixedly attached.

Reference numeral 25 denotes a rear group lead nut which is screwed with the rear group lead screw 23, and which is the two lead nut gears 1 described above.
Unlike the cases of Nos. 6 and 17, the rear group frame 6 is fixedly provided. Therefore, when the rear group lead screw 23 rotates, the rear group lead screw 23 moves together with the rear group frame 6 in the front-rear direction along the optical axis O.

In this case, the direction of the lead propulsion action generated between the rear group lead screw 23 and the rear group lead nut 25 is such that when the second motor 21 rotates in the forward direction, the rear group frame 6 is moved to the film surface. It is set in advance so as to move in a straight direction.

The fixed lead screw 19 which is screwed into each other
And the first lead nut gear 16 between the moving lead screw 2
0 and the second lead nut gear 17, between the rear group lead screw 23 and the rear group lead nut 25, and between the gears meshing with each other, mechanical feed such as screw backlash or mesh backlash or backlash. Since backlash is likely to occur, the screwing precision and the meshing precision of each should be maintained as good as possible.

26 and 27 are the above-mentioned first motor 10
Number of rotations or angle of rotation (hereinafter collectively referred to as "number of rotations")
The first motor 1 is provided by the first digital signal generating means provided in the fixed lens barrel 2 so that the first motor 1 can be detected as a digital signal.
It is composed of a first rotary encoder 26 fixedly attached to the output shaft of 0, and a first photo interrupter 27 combined with the first encoder 26.

28 and 29 are the above-mentioned second motor 21
Second digital signal generating means provided in the base barrel 4 so as to detect the number of rotations of the second rotary encoder 28 as a digital signal, and a second rotary encoder 28 fixedly attached to the output shaft of the second motor 21. , This second encoder 2
8 and a second photo interrupter 29 in combination.

These two digital signal generating means 26,
The rotation speeds of the first and second motors 10 and 21 detected by 27, 28, and 29 are configured to be output to the overall control unit 103 as digital signal count values.

Reference numerals 31 and 32 denote front lens group position detecting means for detecting the moving position of the front lens group L1 on the optical axis O at the time of zooming as an electric signal. From a first sliding contact piece 31 mounted in a cantilever manner via an appropriate insulating material, and an electric signal generating member 32 provided on the inner peripheral surface of the fixed lens barrel 2 via the appropriate insulating material. It is configured.

In this case, the electric signal generating member 32 is formed as a plate-like electric resistor which is elongated along the optical axis O in the front-rear direction, and the driving lens barrel 3 and the base lens barrel 4 are used for zooming. Is moved in the front-rear direction, the moving position of the driving lens barrel 3 at that time is set as an electric resistance value according to the moving amount of the first sliding contact piece 31 from the reference position on the plate-shaped electric resistor 32. The detected value is detected and the front lens group L1 is detected.
Is configured to be output to the total control unit 103 as the moving position information of the.

Reference numerals 41 and 42 denote rear group lens group position detecting means for detecting the moving position of the rear group lens group L2 on the optical axis O at the time of focusing as an electric signal. A second sliding contact piece 41 mounted in a cantilever manner via an appropriate insulating material 7 and an electric signal generating member 42 provided on the inner peripheral surface of the base lens barrel 4 via the appropriate insulating material 7. It consists of and.

In this case, similarly to the front lens group position detecting means 31 and 32, the electric signal generating member 42 is, for example, a plate-like electric resistor which is elongated in the front-rear direction along the optical axis O. And the rear group frame 6 for focusing.
Is moved in the front-rear direction in the base lens barrel 4, the moving position of the rear group frame 6 is changed from the reference position on the plate-shaped electric signal generating member 42 to the second sliding contact piece 41. It is configured so that it can be detected as an electric resistance value corresponding to the amount of movement, and this detected value can be output to the overall control unit 103 as movement position information of the rear lens group L2.

In FIG. 3, reference numeral 101 denotes an automatic distance measuring means (hereinafter referred to as "AF means") equipped with, for example, an infrared light projecting type distance measuring circuit, which detects a photographing distance at each focal length at each time. It is configured so that the detected shooting distance information can be converted into an electric signal and output to the integrated control unit 103.

Reference numeral 102 denotes a zooming operation means that is operated during zooming and storage. For example, the photographic optical system L can be moved from the wide side to the tele side by W → T operating member 102a and the tele side can be moved from the wide side to T. → It is configured to have a W operation member 102b.

In this case, when the W → T operating member 102a is operated, both the first motor 10 and the second motor 21 rotate in the forward direction, and when the T → W operating member 102b is operated, the first motor 10 and the second motor 21 are operated. Is configured to be able to output an operation command such that both rotate in opposite directions to the overall control unit 103 described later.

It should be noted that when the zooming operation means 102 is operated, a zooming finder device (not shown) having an appropriate structure can change the photographing visual field range in such a relation as to correspond to the focal length at that time. Shall be preconfigured and placed.

Reference numeral 103 denotes an overall control unit 103 which controls the overall control of the taking lens barrel device 1. In addition to the normal execution control of the taking sequence, the first motor 10 and the second motor 21 are provided.
Is also configured to perform the following execution control.

That is, the first motor 10 and the second motor 21 are configured to execute the control described in 1) to 4) below.

1) The amount of movement of the front lens group L1 corresponding to the focal length at each time and the front lens group L at that time.
The number of rotations and the direction of the first motor 10 and the second motor 21 corresponding to the value of the axial distance between the first lens group L2 and the rear lens group L2 are set, and the number of rotations is set based on the operation command of the magnification changing operation means 102. The first motor 10 and the second motor 21 are driven in the and directions.

2) The focusing amount at each focal length is calculated based on the photographing distance information from the AF means 101, and the rotation speed and direction of the second motor 21 corresponding to this focusing amount are set. , The second motor 2 based on the operation command of the scaling operation means 102, depending on the rotation speed and direction.
Drive 1

3) When the taking lens barrel device 1 is housed, the rotational speed and direction of the front lens group L1 and the rear lens group L2 when housed are set, and based on the operation command of the zooming operation means 102. , The first motor 1 depending on its speed and direction
0 and the second motor 21 are driven.

4) First digital signal generating means 26, 2
7 and the outputs of the second digital signal generating means 28 and 29,
Also, the outputs of the front lens group position detecting means 31 and 32 and the rear lens group position detecting means 41 and 42 are used to determine the rotational speeds, moving positions and stop timings of the first motor 10 and the second motor 21. .

The general control section 103 is constructed so as to be able to execute the above control.

Reference numeral 110 in FIG. 4 denotes a lens barrier mechanism incorporated in the taking lens barrel device 1.

Reference numeral 111 denotes a barrier drive shaft rotatably supported by the barrier drive shaft fitting hole 4a of the base lens barrel 4 described above, the longitudinal direction of which is provided in parallel with the optical axis O, and further, as appropriate. Due to the above structure, it cannot move in the optical axis O direction.

That is, the barrier drive shaft 111 moves together in the same direction when the base lens barrel 4 moves in the front-rear direction along the optical axis O, but is free with respect to the base lens barrel 4 when necessary. It is installed so that it can rotate.

Reference numeral 112 denotes an opening / closing drive lever formed at the end of the barrier drive shaft 111 on the film surface side, and when the base lens barrel 4 moves to the film surface side, at the end of the movement (for example, at the wide end position). It is provided at a position where it can engage with the barrier opening / closing cam 3b of the drive lens barrel 3 described above. After the engagement, the cam action of the inclined cam surface 3c causes it to rotate clockwise in FIG.

Reference numeral 113 is an intermediate lever formed at the end of the barrier drive shaft 111 on the object side, and has an interlocking pin 114 at its tip as shown in an enlarged view in FIG.

The interlocking pin 114 is provided so as to be fitted in the interlocking groove 117c of the intermediary lever 117, which will be described later, and the opening / closing drive lever 112 is rotated clockwise by the cam action of the inclined cam surface 3c described above. Sometimes, Figure 4
And is configured to be rotatable clockwise in FIG.

Reference numeral 115 denotes a lens barrier formed in such a shape as to shield the entire front surface of the front lens group L1, and a support shaft 116 provided at a position substantially parallel to the optical axis O.
Is provided so as to be rotatable within the range between the open position (solid line position in FIGS. 4 and 5) and the shield position (dotted line position in FIGS. 4 and 5).

Reference numeral 115a is the lens barrier 115.
With an open position stopper to set the position when opening
It is planted at an appropriate position in the base lens barrel 4.

The intermediary lever 117 is provided so as to be located between the support shaft 116 and the barrier drive shaft 111 and in a space portion outside the photographing optical path, and a barrier to be described later is provided in the vicinity of the right end portion thereof. The other end 12 of the spring 120
0b and a first rising portion 117a that locks the other end portion 122b of the connecting spring 122, which will be described later, are formed, and are positioned to the left of these rising portions 117a and 117b. The area to be
Arc-shaped interlocking groove 11 into which the interlocking pin 114 is fitted.
7c is formed.

One end of 118 is a lens barrier 115.
Is a link lever substantially integrated with the other end of the intermediate lever 117 with an appropriate link pin 119.
Is rotatably connected to the other end of the.

The barrier spring 120 is for opening the lens barrier 115, and is provided so as to wind the barrier drive shaft 111. The barrier spring 120 is formed and wound so as to have an urging force (counterclockwise) that moves the above-mentioned intermediary lever 117 to the right, and one end portion 120a thereof is inside the base lens barrel 4. It is stretched so as to be locked by a locking pin 121 that is planted at an appropriate position, and the other end 120b is locked by the first rising portion 117a of the intermediary lever 117.

Reference numeral 122 denotes a connecting spring which is provided so as to wind the barrier drive shaft 111 like the barrier spring 120. The connecting spring 114 and the intermediary lever 117 are described above.
One end 122a is locked by the outer peripheral surface on the left side of the interlocking pin 114, and the other end 122b is locked by the second rising portion 117b of the intermediary lever 117 so as to urge the two together. It is stretched to be done.

That is, the right outer peripheral surface of the interlocking pin 114 and the right inner peripheral end surface of the interlocking groove 117c of the intermediary lever 117 are stretched in a direction in which they are pressed against each other. Therefore, the interlocking pin 114 and the intermediary lever 117 come into contact with each other by the biasing force of the connecting spring 122 so as to attract each other.

Next, the operation or action for zooming and focusing in the illustrated embodiment thus constructed will be described.

In the illustrated embodiment, when the camera or the photographic lens barrel device 1 is in a non-photographing state or in a non-photographing state, the lens barrels 2 to 4 are shortened in a telescopic manner with respect to each other as shown in FIG. It will be placed in the unused state (stored state).

That is, in this state, the rear group frame 6 completely enters the base lens barrel 4, the base lens barrel 4 also completely enters the drive lens barrel 3, and the drive lens barrel 3 is fixed to the fixed lens barrel 2. It is completely inside and is in a state as shown in FIG.

At this time, as will be described later, the opening / closing drive lever 112 of the barrier drive shaft 111 is moved to the drive lens barrel 3
The barrier drive shaft 111 is engaged with the barrier opening / closing cam 3b and receives the cam action of the inclined cam surface 3c.
Is a clockwise direction against the counterclockwise biasing force of the barrier spring 120 applied to itself via the intermediary lever 117, the connecting spring 122, and the interlocking pin 114 (hereinafter referred to as the “interlocking pin 114 etc.”). It is rotated and, moreover, the posture in which it is pressed by the inclined cam surface 3c is maintained as it is.

Therefore, the interlocking pin 11 of the intermediate lever 113
4 also follows the interlocking groove 117b of the intermediary lever 117.
At this time, an urging force is generated between the one end 122a and the other end 122b of the connecting spring 122 to move the other end 1 of the connecting spring 122.
Since 22b is in a state of pressing the second rising portion 117b of the intermediary lever 117, the intermediary lever 117 is moved leftward by this pressing force.

When the intermediary lever 117 moves to the left, this moving force is transmitted to the lens barrier 115 via the link lever 118, so that the lens barrier 115 is in the solid line position (open position) shown in FIGS. 4 and 5. To the dotted line position (shielding position) that protects the photographic optical system L from an external force, and remains at the position after this rotation.

That is, the lens barrier 115 is in a state of blocking the front space of the front lens group L1 and maintains this state.

In this state, when the W → T operating member 102a of the variable power operating means 102 is operated, the first motor 10
Rotates in the positive direction and transmits the rotational driving force to the first lead nut gear 16 via the first drive gear 11 → the first driven gear 13 → the small judgment surface drive shaft 12 → the drive transmission gear 14. Further, it is transmitted to the second lead nut gear 17 via a gear train (not shown).

In this case, the first lead nut gear 16 which receives the rotational driving force from the first motor 10 advances straight from the position shown in FIG. 2 toward the object side due to the lead propulsion action of the fixed lead screw 19. The movable lens barrel 3 to move the driving lens barrel 3 relative to the fixed lens barrel 2 to a position where the focal length at the wide end can be realized.

Further, the second lead nut gear 17 receiving the rotational driving force from the first motor 10 rotates on the ring frame 3a of the driving lens barrel 3 in the process of moving toward the object side, and is rotated by the first motor. Since the rotational driving force from 10 is transmitted to the moving lead screw 20, the moving lead screw 20 moves linearly from the position of FIG. 4 is moved relative to the drive lens barrel 3 to a position where the focal length at the wide end can be realized.

Further, at this time, the total control unit 103
However, in parallel with the movement control of the drive lens barrel 3 and the base lens barrel 4 toward the object side, the rear lens group frame 6 (rear lens group L2) is moved from the stored position to the wide end position. Therefore, the second motor 21 rotates in the positive direction by the number of rotations necessary to move the rear group frame 6 from the stored position to the wide end position, and the rotational driving force of the second motor 21 Drive gear 22
→ Second driven gear 24 → Transmitted to the rear group lead nut 25 via the rear group lead screw 23.

Therefore, the rear group frame 6 which holds the rear group lead nut 25 is linearly moved from the position of FIG. 1 toward the film surface side by the lead propulsion action of the rear group lead screw 23, It reaches a position where the focal length at the wide end can be realized.

In this way, when the drive lens barrel 3 and the base lens barrel 4 simultaneously move to the position where the focal length at the wide end is realized, in the movement process, the opening / closing drive lever 112 of the barrier drive shaft 111 and the drive mirror. Barrier opening and closing cam 3 of the body 3
The engagement with b is released.

Therefore, the three members of the barrier drive shaft 111, the intermediate lever 113, and the interlocking pin 114 have the biasing force of the barrier spring 120 applied to the barrier drive shaft 111 via the first rising portion 117a of the intermediary lever 117. , Is rotated counterclockwise via the interlocking pin 114 and the second rising portion 117b of the intermediary lever 117.

In this rotating process, the interlocking pin 114 on the intermediate lever 113 presses the right inner peripheral end face of the interlocking groove 117b by the coupling spring 122,
The other end 120b of the barrier spring 120 presses the first rising portion 117a to move the intermediary lever 117 to the right, and further the link lever 118 is rotated clockwise via the link pin 119. 1
The reference numeral 15 rotates clockwise from the dotted line position (shielding position) in FIGS. 4 and 5 to the solid line position (open position), and stops in a state of contacting the open position stopper 115a. .

That is, when the photographing optical system L has finished moving to the wide-angle end position, the lens barrier 115 shifts to the open state, and the photographing is possible.

In this state, when the W → T operating member 102a is further operated while observing the variable magnification finder device, the driving lens barrel 3 and the base lens barrel 4 are changed toward the object side. It will be a double time move.

However, the moving operation of the drive lens barrel 3 and the base lens barrel 4 at this time is exactly the same as the moving operation of both lens barrels 3 and 4 from the storage position to the wide end position described above. The description is omitted to avoid complexity.

By the way, the drive barrel 3 and the base barrel 4
When moving from the stored position to the wide end position,
It has already been described that the comprehensive control unit 103 also controls the movement of the rear group frame 6 in parallel with the movement control of both the lens barrels 3 and 4.

However, in the illustrated embodiment, the method of controlling the movement of the rear group frame 6 at this time and the method of controlling the movement of the rear group frame 6 during the zooming operation are made different. In the illustrated embodiment, when the three lens barrels 2 to 4 are shortened telescopically, the rear group frame 6 is shortened in such a state that the rear lens frame 6 does not project from the rear end edge of the base lens barrel 4 to the film surface side. It is due to the fact that it is configured in a different structure.

In the illustrated embodiment, the three lens barrels 2 to
4 is shortened, first, the rear group frame 6 is moved in the field direction from a position where the focal length at the wide end is realized to a position where it can be completely submerged in the base lens barrel 4, and thereafter, in this state. Since the base lens barrel 4 is moved to the stored position, it is possible to move the drive lens barrel 3 and the base lens barrel 4 from the stored position to the wide end position at the time of shooting. The rear group frame 6 is driven by rotating the motor 2 in the forward direction.
Is moved toward the film surface side, and the axial distance between the front lens group L1 and the rear lens group L2 needs to be set once again to the widest distance necessary to realize the focal length at the wide end. Because there was.

However, when the rear group frame 6 has finished moving to the position for realizing the focal length at the wide end, the rear group frame 6 is moved in one direction (toward the subject) from this position to the position at the tele end. It suffices to perform the scaling operation.

Therefore, when the drive lens barrel 3 and the base lens barrel 4 are moved (magnified) from the wide end position to the tele end position, the total control unit 103 causes the first motor 10 to move.
The second motor 2 is configured to be rotationally controlled in the reverse direction in parallel with the rotational control of the second motor 2.

That is, in the control at the time of this magnification change, the general control section 103 changes the first motor 10 according to the movement amount of the drive lens barrel 3 and the base lens barrel 4 (front lens group L1). The control is performed so as to rotate in the positive direction by the number of rotations at the time of doubling, and in parallel with this, the second motor 21 is scaled in accordance with the amount of movement of the drive lens barrel 3 and the base lens barrel 4. The control is performed so as to rotate in the opposite direction by the total rotation speed of the rotation speed at that time and the rotation speed at the time of focusing according to the shooting distance at that time.

Therefore, the driving lens barrel 3, the base lens barrel 4, and the rear lens group frame 6 are all moved to the object side, and the front lens group L1 is moved to a position where the focal length at that time can be realized. ,
At the same time, the rear lens group L2 is moved to a position where an axial distance between the lens groups L1 and L2 for realizing the focal length at that time and a focusing amount according to the shooting distance at that time can be realized. .

In this case, the respective rotation speeds of the first motor 10 and the second motor 21 are detected by the first digital signal generating means 26, 27 and the second digital signal generating means 28, 29, respectively, and the total number of rotations is calculated. The moving positions of the driving lens barrel 3 (also the base lens barrel 4) and the rear lens group frame 6 from the reference position are fed back to the control unit 103, and the front lens group position detecting means 31,
32 and the rear lens group position detection means 41 and 42, and the feedback is fed back to the integrated control unit 103. Therefore, the integrated control unit 103 operates the first motor 10 and the second motor 21 based on these detected values. You will have precise control.

When the desired focal length (magnification) is obtained in this way, the operation of the W → T operating member 102a is interrupted, and a shutter release operating member (not shown) is pressed to execute a normal photographing sequence. .

On the other hand, when the focal length is changed from the tele side to the wide side, the T → W operating member 102b of the variable power operating means 102 is operated.

In this case, the first motor 10 moves in the reverse direction,
The second motor 21 rotates in the forward direction, respectively. At this time, the movement of the drive barrel 3 and the rear group frame 6 by the motors 10 and 21 is the same as the moving direction and the rotating direction of the respective constituent members. Since it is only the opposite of the case where the magnification is changed from the wide side to the tele side, the description thereof will be omitted to avoid complication.

In any of the illustrated embodiments, the user sets the movement amount (magnification change amount) of the drive lens barrel 3 and the rear group frame 6 from the reference position by the user of the magnification change operation means 102. → T operation member 102a and T → W operation member 102b
It depends on the length of time to operate.

Next, the operation or action when the taking lens barrel device 1 is moved to the housed state will be described.

In this case, the operation is the T → W operation member 102.
This is performed as an extension operation of the variable power operation from the tele side to the wide side by b. That is, T → W operation member 1
When 02b is operated, in the region from the tele end to the wide end, the first motor 10 rotates in the reverse direction and the second motor 21 rotates in the positive direction, so that the drive lens barrel 3, the base lens barrel 4, and the rear group frame. 6 is moved toward the film surface side.

Then, in the region from the wide end position to the storage position, both the first motor 10 and the second motor 21 rotate in opposite directions, and the first motor 10 causes the drive lens barrel 3 and the base lens barrel 4 to move. Is moved toward the film surface side, and the second motor 21 moves the rear group frame 6 to the object side so that the three lens barrels 2 to 4 are telescopically tripled as shown in FIG. Located in.

At this time, in the final movement process of the base barrel 4, the opening / closing drive lever 11 of the lens barrier mechanism 110 is moved.
2 engages with the barrier opening / closing cam 3b of the drive lens barrel 3 and is forced to rotate clockwise by the cam action of the inclined cam surface 3c, and accordingly, the barrier opening / closing lever 3 is substantially integrated with the opening / closing drive lever 112. The barrier drive shaft 111, the intermediate lever 113, and the interlocking pin 114 also rotate clockwise.

At this time, the interlocking pin 114 and the intermediary lever 1
Since the intermediary lever 117 is pressed leftward by the sandwiching action of the connecting spring 122 with the second rising portion 117b of the intermediary 17, the intermediary lever 117 moves leftward, and the link lever 118 is moved via the link pin 119.
Is rotated counterclockwise with the support shaft 116 as the center of rotation.

Therefore, the lens barrier 115, which is substantially integrated with the link lever 118, also rotates counterclockwise from the solid line position (open position) to the dotted line position (shielding position) in FIGS. 4 and 5 and stops at this position. Will be done. That is, the lens barrier 115 is in a state of blocking the front space of the front lens group L1.

This state continues as long as the opening / closing drive lever 112 is in contact with the barrier opening / closing cam 3b of the driving lens barrel 3, so that the lens barrier 115 remains as long as the taking lens barrel device 1 is in the shortened state. Therefore, it is possible to protect the photographing light beam incident opening of the photographing optical system L from an external force.

Although one embodiment has been described above, the present invention is not limited to this, and it should be noted that various modifications can be made without departing from the scope of the invention.

For example, in the illustrated embodiment, both the front lens group position detecting means 31 and 32 and the rear lens group position detecting means 41 and 42 are constructed as potentiometers using plate-like electric resistors. It can also be configured as follows.

That is, a plurality of strip-shaped plates made of appropriate conductors are installed in parallel on an insulating substrate at substantially equal intervals along the optical axis to prepare a conductor pattern. First, the conductor pattern is illustrated. Instead of the plate-shaped electric resistor of the embodiment, it is attached to the fixed lens barrel 2 and the base lens barrel 4, and the sliding contact pieces 31 and 41 are configured to scan on the conductor pattern.

Then, when the drive lens barrel 3 and the rear group frame 6 move on the optical axis, the respective sliding contact pieces 31, 41 are moved.
Is used to detect the moving positions of the drive lens barrel 3 and the rear group frame 6 by utilizing on / off signals generated by successively contacting the strip-shaped plates on each conductor pattern.

Then, for example, the on-axis position of the front lens group L1 and the rear lens group L2 corresponding to each focal length at infinity is determined by the number of pulses from the generation point of the ON / OFF signal of each strip plate. As set in advance at the time of optical design,
First, the number of on / off signals of the strip plate is counted to detect the approximate moving positions of the front lens group L1 and the rear lens group L2, and then the pulse from the generation point of the detected on / off signal is detected. It is also possible to move the front lens group L1 and the rear lens group L2 by a certain number to detect the final movement positions of the front lens group L1 and the rear lens group L2.

In this case, if the stepwise variable magnification method is adopted as the variable magnification method of the photographing optical system, the control method will be simplified.

Also in the case of detecting each focusing position at each focal length, the expected focusing amount is set in several steps by utilizing the depth of focus effect, and the It is also possible to use a technique for detecting the focal length to detect the final focusing position.

In the illustrated embodiment, the drive lens barrel 3 and the base lens barrel 4 are simultaneously fixed to the fixed lens barrel 2 when the photographing lens barrel device is moved from the non-photographing state or the non-use state to the stored state. The drive lens barrel 3 is first housed in the fixed lens barrel 2 and then the base lens barrel 4 is housed in the drive lens barrel 3 and vice versa. The base lens barrel 4 may be housed in the drive lens barrel 3 and then the drive lens barrel 3 may be housed in the fixed lens barrel 2.

In the illustrated embodiment, the photographic optical system is constructed as a variable focus type optical system, but it may be constructed as a photographic optical system having a single focal length.

Further, in the illustrated embodiment, the lens barrier mechanism having one lens barrier is adopted, but the present invention is also applied to, for example, a lens barrier mechanism having two lens barriers opened in opposite directions. You can

Further, in the illustrated embodiment, two partial lens barrels including the driving lens barrel 3 and the base lens barrel 4 are housed in the fixed lens barrel 2, but three or more partial lens barrels are fixed mirrors. It can also be applied to a taking lens barrel device configured to be housed in the barrel 2.

[0126]

As described above, according to the present invention, (a)
At least two partial lens barrels capable of telescopically expanding and contracting the lens barrel portion of the taking lens barrel device for a camera (a partial lens barrel at the head and a partial lens barrel at the middle)
It is configured as a telescopic compound lens barrel including a lens barrel main body (or a camera), and (b) these two partial lens barrels are movable relative to each other along the same optical axis,
In addition, the partial lens barrel located at the head (the first partial lens barrel in the illustrated example) can be housed in the internal space of the partial lens barrel located in the middle (the second partial lens barrel in the illustrated example). ,
The lens barrel main body is constructed so that these two partial lens barrels can be housed simultaneously or sequentially in its own internal space. (C) The lens barrel portion composed of these three members is It is configured so that it can be driven relatively to the use position in a telescopically extended state and to the retracted position in a telescopically shortened state during non-shooting, respectively. The first partial lens barrel is provided with an opening / closing lens barrier means capable of shielding the photographing light incident opening of the system from the outside, and the lens barrier opening / closing means for opening / closing the lens barrier in the opening / closing lens barrier means is the second partial lens barrel. When the first partial lens barrel is started to be driven toward the object side from at least the retracted position (the state when not shooting), the relative distance between the first partial lens barrel and the second partial lens barrel on the optical axis is set. In conjunction with the operation to widen the by open lens barrier retractable lens barrier means,
At least when the first partial lens barrel has finished moving relative to the storage position from the use position (the state at the time of photographing), the operation of narrowing the relative distance between the first partial lens barrel and the second partial lens barrel on the optical axis. Since the lens barrier can be forcibly closed by interlocking with the above, and because it is configured under the above various conditions, there are fewer component parts than the conventional device of this kind and problems in terms of accuracy maintenance It is possible to provide a taking lens barrel device for a camera, which is robust enough not to cause it and has a lens barrier having a new structure that does not adversely affect the driving system of the taking lens.

Therefore, according to the present invention, it is possible to achieve cost reduction, space saving, and size reduction as compared with the conventional device of this type.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a configuration of a taking lens barrel device for a camera having a lens barrier according to the present invention, showing a state in which a taking optical system is extended to a position at the time of taking an image.

FIG. 2 is a schematic configuration diagram showing a state in which the taking optical system shown in FIG. 1 is moved from a paid-out position to a stored position.

FIG. 3 is a block diagram schematically showing a control system of the taking lens barrel device for the camera shown in FIG.

FIG. 4 is a perspective view of a lens barrier mechanism provided in the taking lens barrel device for the camera shown in FIG.

5 is a front view of the lens barrier mechanism shown in FIG.

6 is a view for explaining a method of stretching the barrier spring and the coupling spring stretched between the intermediary lever and the locking pin and between the interlocking pin and the intermediary lever in the lens barrier mechanism shown in FIG. It is an enlarged explanatory view for.

[Explanation of symbols]

L shooting optical system L1 front lens group L2 rear lens group O Shooting optical axis (optical axis) 1 Photography lens barrel device 2 Fixed lens barrel 3 drive lens barrel 3a Ring frame 3b barrier open / close cam 3c Inclined cam surface 4 base lens barrel 4a Barrier drive shaft fitting hole 5 front group frame 6 Rear group frame 10 First motor 11 First drive gear 12 Small judgment surface drive shaft 13 First driven gear 14 Drive transmission gear 15,15 'Gear restraining member 16 First lead nut gear 17 Second lead nut gear 19 Fixed lead screw 20 Moving lead screw 21 second motor 22 Second drive gear 23 Rear group lead screw 24 Second driven gear 25 Rear group lead nut 26 First rotary encoder 27 First Photointerrupter 28 Second rotary encoder 29 Second Photointerrupter 31, 32 front lens group position detecting means 31 First sliding contact piece 32 Electric signal generating member (plate-shaped electric resistor) 41, 42 Rear lens group position detecting means 41 Second sliding contact piece 42 Electric signal generating member (plate-shaped electric resistor) 101 Automatic distance measuring means (AF means) 102 Magnification changing means 102a W → T operation member 102b T → W operation member 103 Total control unit 110 Lens barrier mechanism 111 Barrier drive shaft 112 Open / close drive lever 113 Intermediate lever 114 interlocking pin 115 lens barrier 115a Open position stopper 116 Support shaft 117 Mediation lever 117a First rising portion 117b Second rising portion 117c interlocking groove 118 Link lever 119 Link Pin 120 barrier spring 121 Locking pin 122 Connection spring

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Terui             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh

Claims (5)

[Claims] 1. An imaging optical system including a first lens group and a second lens group, which are arranged so as to be movable relative to each other along the same optical axis, and provided so as to be movable relative to each other along the optical axis. Of the at least two partial lens barrels configured so that one partial lens barrel can be housed in the internal space of the other partial lens barrel at least in the non-photographing state A first partial lens barrel configured to be capable of fixedly holding the first lens group of the optical system; and a portion of the two partial lens barrels that is located between the first partial lens barrel and the lens barrel body. A second partial lens barrel provided so as to be housed in the internal space of the lens barrel main body at least in a non-photographing state; and the first and second partial lens barrels along the optical axis. Support so that relative movement is possible, and at least during non-shooting In the state, the lens barrel main body portion configured to be able to house the first and second partial lens barrels in its own internal space simultaneously or sequentially; and the first lens provided in the first partial lens barrel. An openable lens barrier means configured to shield the space on the object side of the group from the outside, and the first partial lens barrel provided on the side of the second partial lens barrel and not photographing. The lens barrier of the lens barrier means may be closed when driven to the state position, and the lens barrier may be opened when the first partial lens barrel starts to be driven to the object side from the non-photographing state position. And a lens barrier opening / closing means configured as described above, and a taking lens barrel device for a camera provided with a lens barrier. 2. A lens barrier of an openable lens barrier means provided in the first partial lens barrel is configured to be opened when in a free state, and is provided on the second partial lens barrel side. The lens barrier opening / closing means, the lens barrier of the opening / closing lens barrier means or its interlocking member at the end of the movement of the first partial lens barrel when the first partial lens barrel is driven to the position in the non-photographing state. The lens barrier according to claim 1, wherein the lens barrier is configured to be engaged and configured to forcibly shift the lens barrier from the open state to the closed state by the engagement operation. Photo lens barrel device for a camera. 3. The photographic optical system is configured as a variable-focus photographic optical system capable of changing the focal length by axial relative movement of the first lens group and the second lens group, and the second optical system of the photographic optical system. A movable lens group holding frame having a structure capable of fixedly holding the lens group is attached in the first partial lens barrel so as to be movable relative to the first partial lens barrel in the optical axis direction, and at least the focal length is changed. In doing so, the first partial lens barrel and the movable lens group holding frame are synchronously moved to a position corresponding to the axial distance between the first lens group and the second lens group when the focal length at that time is realized. The taking lens barrel for a camera having a lens barrier according to claim 1 or 2, wherein a first driving unit and a second driving unit that can be moved so as to be movable are additionally provided. apparatus. 4. The non-photographing state position of the first partial lens barrel is set as a position when the first partial lens barrel is finally stored in the internal space of the lens barrel body. A taking lens barrel device for a camera, comprising the lens barrier according to claim 1. 5. A photographing optical system including a first lens group and a second lens group, which are arranged so as to be movable relative to each other along the same optical axis, and drive the first lens group and the second lens group. As a target member, a motor drive means including a drive system for relatively driving them, and an openable lens barrier means provided so as to shield the photographing light beam incident opening of the photographing optical system from the outside are configured. In the taking lens barrel device for a camera, a moving member other than the driving system of the motor driving means, which does not directly hold the first lens group and the second lens group, is provided with an optical axis relative moving member. A photographing lens barrel for a camera provided with a lens barrier, characterized in that the lens barrier of the lens barrier means can be opened and closed by relative movement of the relative movement member on the optical axis. Location.