JP3448618B2 - Interchangeable lens camera - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera with interchangeable lenses.

[0002]

2. Description of the Related Art As a lens shutter camera with interchangeable lenses, one disclosed in Japanese Patent Laid-Open No. 56-91224 is known. In this type of camera, it is conceivable to provide a zooming unit in a taking lens barrel (interchangeable lens) and drive the zooming unit by a zoom motor provided on the camera side to change the focal length. In this case, the zooming unit expands and contracts in the optical axis direction with respect to the body of the lens barrel, but if the lens barrel is removed from the camera body while the zooming unit is still extended, the lens barrel will not be stored or held. It interferes with transportation. On the other hand, when a lens barrel having a barrier that can be opened and closed in front of the taking lens is used as an interchangeable lens, if the lens barrel is removed from the camera body while the lens barrier is open, it will be The lens may be damaged.

It is an object of the present invention to provide a lens-replaceable camera which does not hinder the storage or carrying of the taking lens barrel detached from the camera.

[0004]

In order to achieve the above object, a lens interchangeable camera according to the invention of claim 1 is
The mounting part where the shooting lens barrel that can expand and contract in the optical axis direction of the shooting lens is detachably mounted, and the mounting part of the shooting lens barrel except when the mounted shooting lens barrel is contracted most. And a prohibition device that prohibits removal from the device.
In the camera with interchangeable lenses according to the invention of claim 8, a taking lens barrel having a barrier that can be opened and closed between a closed position that covers the front surface of the taking lens and an open position that retracts from the front surface of the taking lens is removable. The apparatus includes a mounting portion to be mounted and a prohibiting device that prohibits removal of the taking lens barrel from the mounting portion except when the barrier is in the closed position.

[0005]

According to the first aspect of the present invention, the removal of the taking lens barrel is prohibited except when the mounted taking lens barrel is in the most contracted state. Will not be removed from. In the invention of claim 8, the taking lens barrel is prohibited from being detached from the camera body while the barrier is open, since the taking lens barrel is prohibited from being removed except when the barrier is in the closed position.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a camera with interchangeable lenses according to the present invention. On the front surface of the camera body 40, a window 201 for distance measurement and a light emitting window 202 of an electronic flash device are provided, and an interchangeable lens barrel (hereinafter, simply referred to as a lens barrel) 100 is a bayonet type lens. A mount 13 is provided. A release switch 203 is provided on the upper surface of the camera body 40, and a zoom up switch ZUS and a zoom down switch ZDS are provided on the back surface of the camera body 40.

FIG. 2 is a sectional view showing the internal structure of the camera body 40 and the lens barrel 100. Camera body 4
A guide tube 12 having a guide groove 12a formed in the optical axis direction is fixed to the inside of 0, and a set tube 14 having a cam groove 14a formed on the peripheral surface is provided on the outer peripheral surface side of the guide tube 12. Is rotatably extrapolated. The fixing ring 15 prevents the set cylinder 14 from coming off the guide cylinder 12. A lens barrel 100 can be inserted into the inner peripheral surface side of the guide barrel 12 as shown in FIG. Hereinafter, this lens barrel 10
The configuration of 0 will be described.

In FIG. 2, a cylindrical first barrel cover 9 is provided.
A fixed barrel 8 is held in the fixed barrel 8, and a guide groove 8b in the optical axis direction is formed on the inner peripheral surface of the fixed barrel 8. The cam barrel 7 is inserted into the fixed barrel 8, and the cam barrel 7 is rotatably held by the fixed barrel 8 and the first barrel cover 9. The cam barrel 7 is formed with two cam grooves 7a and 7b.

A zooming unit 110 is inserted through the inner peripheral surface of the cam barrel 7 so as to be movable in the optical axis direction. The zooming unit 110 has a second lens barrel cover 27 that holds the first lens group 1 and the lens shutter 6, and a second lens group 2 that is arranged at the rear portion. The first lens holding frame 4 is fixed to the inner peripheral surface side of the second lens barrel cover 27, and the lens chamber 5 holding the first lens group 1 is inserted into the inner peripheral surface side thereof. The threaded portion 4b formed on the first lens holding frame 4 is screwed into the threaded portion 5a formed on the outer peripheral surface of the lens chamber 5, so that the first lens group 1 is rotated by the rotation of the lens chamber 5. It is driven in the optical axis direction integrally with the lens chamber 5. Focusing is performed by the movement of the first lens group 1. Reference numeral 36 is a spring for removing looseness of the screw portions 4b and 5a, and the lens shutter 6 is arranged behind the spring 36.

Lens barriers 51 and 52 are openably and closably provided at the opening of the front end of the second lens barrel cover 27. 1 and 7 show a state in which the lens barriers 51 and 52 are closed, and FIGS. 6 and 8 show a state in which the lens barriers 51 and 52 are open. When the barriers are closed, the first lens group 1
Is covered with lens barriers 51 and 52. As shown in FIG. 7, the arms 51 provided on the lens barriers 51 and 52.
B and 52B are rotatably supported about shafts 54A and 54B, and are biased by springs 56A and 56B in a direction in which the barriers 51 and 52 are closed.

Reference numeral 53 denotes a drive ring rotatably supported inside the tip portion of the second lens barrel cover 27, and notches 53a and 53b formed in the drive ring 53 have arms 51B of the lens barriers 51 and 52, respectively. , Pin 5 protruding from 52B
5A and 55B are engaged. The drive ring 53 is biased clockwise in the drawing by a spring 57 whose one end is locked to the arm 53c. The arm 53c extends to the rear of the lens barrel as shown in FIG. 1, and the slope portion formed at the tip thereof can be engaged with the lens mount 11 described later. When the zooming unit 110 is in the retracted position (the position shown in FIG. 1), the arm 53c is engaged with the lens mount 11, and at this time the rotation of the drive ring 53 due to the urging force of the spring 57 is blocked and the barriers 51, 52 are closed. Held in position.

When the zooming unit 110 is driven from the retracted position to the wide-angle end position (position in FIG. 6), the arm 53c is moved.
Is separated from the mount 11, the drive ring 53 is rotated clockwise by the urging force of the spring 57, and the notch 53
a, 53b pushes the pins 55A, 55B so that the arm 5
1A and 52A rotate, and the lens barriers 51 and 52 open. When the zooming unit 110 returns to the collapsed position side,
The inclined portion of the tip of the arm 53c rides on the mount 11 against the biasing force of the spring 57, whereby the drive ring 53 rotates counterclockwise and the barriers 51, 52 close.

Returning to FIG. 2, a second lens holding frame 3 is provided behind the second lens barrel cover 27, and the second lens group 2 has a first lens group 2 and a second lens group 2. It is held coaxially with the lens group 1. The cam followers 4a and 3a, which are provided on the outer peripheral surfaces of the lens holding frames 4 and 3, so as to project,
The cam grooves 7a and 7b formed in the above are respectively engaged with the guide grooves 8b of the fixed barrel 8. A cam follower 4 is provided between the second barrel cover 27 and the lens holding frame 3.
The spring 37 is provided for removing the play of the cam groove 7a and the cam followers 3a and 7b.

When the cam barrel 7 rotates, the cam grooves 7a, 7b
The movement of the cam followers 4a, 3a moves along the guide groove 8b, whereby the zooming unit 110 moves back and forth with respect to the first lens barrel cover 9 in the optical axis direction. Cam groove 7
Since the shapes of a and 7b are different from each other, the distance between the first lens group 1 and the second lens group 2 relatively changes when the zooming unit 110 moves, which changes the focal length of the taking lens. In this embodiment, the zooming unit 110 is movable between the retracted position shown in FIG. 4 and the telephoto end position shown in FIG.

FIGS. 13A to 13C are schematic views showing the structure of a detection mechanism for detecting the position of the zooming unit 110, in which the zooming unit 110 is in the retracted position, the wide-angle end position and the telephoto end position, respectively. Is shown. A conductive pattern 111a is formed on the substrate 111 provided on the outer peripheral surface of the cam cylinder 7, while a brush GN that can contact the conductive pattern 111a is formed on the inner peripheral surface of the fixed cylinder 8.
D, SW1 and SW2 are provided. The brush GND is grounded, and the brushes SW1 and SW2 are the CPU 301 described later.
(FIG. 16). That is, SW1 and SW2 form a switch, the level of which is the zooming unit 1
Depending on the position of 10, it changes as follows. (1) Collapsed position: Both switches SW1 and SW2 are high level (“H”) (2) Wide angle end position: Both switches SW1 and SW2 are low level (“L”) (3) Telephoto end position: Switch SW1 is “ H ", switch SW2 is" L "

In FIG. 2, at the rear end of the fixed barrel 8, a coupling gear 10 meshing with a gear 7c formed at the rear end of the cam barrel 7 and a lens mount 11 are held, and the lens mount 11 is mounted. The mount 11 is engaged with the mount 13 on the camera body side (see FIG. 3). That is, similar to the lens mounting method of a single-lens reflex camera, when the lens mount 11 is engaged with the mount 13 at a predetermined rotation phase and the lens barrel 100 is rotated by a predetermined angle, the mounts 11 and 13 are fixed to each other, The lens barrel 100 is attached to the camera body 40.

The cam follower 13a projecting from the mount 13 on the camera body side penetrates through the guide groove 12a formed in the guide tube 12 in the optical axis direction, and the cam groove 1 of the set tube 14 is formed.
4a is engaged. Therefore, the lens barrel 100
When the set barrel 14 rotates in a predetermined direction with the lens mounted, the cam follower 13a is driven along the guide groove 12a in the optical axis direction by the movement of the cam groove 14a, and the lens barrel 100 is moved to the position shown in FIG. It is retracted to the position shown.

When the lens barrel 100 reaches the position shown in FIG. 4, the coupling gear 10 meshes with the coupling gear 31 on the camera body 40 side, and the zoom motor 304 (FIG. 16) provided on the camera body 40 side rotates. Can be transmitted to the cam barrel 7 via the coupling gears 31 and 10. That is, the focal length can be changed by driving the zooming unit 110 described above. Here, when the coupling gears 10 and 31 are in mesh with each other, the mount 11 cannot rotate with respect to the mount 13,
Therefore, the lens cannot be removed in the state shown in FIG.

Reference numeral 32 denotes a flexible printed circuit board whose one end is connected to the shutter 6 and a focusing drive mechanism (not shown), and the other end of the flexible printed circuit board 32 is formed in the hole 11a of the lens mount 11 and the camera side mount 13. The tip of the connection pin 34 that penetrates the hole 13b is contacted. The base end of the connection pin 34 is a conductive spring 35.
And a CP on the camera body side via a substrate 36 (not shown)
It is connected to U301 (Fig. 16).

In FIG. 2, 20 is a light-shielding member provided on the front surface of the aperture so as to be openable and closable, and 21 is a slide type operation member for opening / closing the light-shielding member 20 and turning on / off the power source, and a part of the operation member 21 Is exposed to the outside through a long hole formed in the bottom surface of the camera body as shown in FIG.
Hereinafter, the opening / closing mechanism of the light shielding member 20 by operating the operation member 21 will be described in detail with reference to FIGS. 10 to 12.

As shown in FIG. 10, the light shielding member 20 is composed of three light shielding plates 15 to 17, and each of the light shielding plates 15 to 17 is provided.
Opening / closing arms 18 and 19 are rotatably connected to. One ends of the open / close arms 18 and 19 are rotatably connected to the camera body 40, and are biased by a spring 24 in the clockwise direction in the drawing. In FIG. 10, the light shielding member 20 is in a closed state, and at this time, the aperture is covered by the three light shielding plates 15 to 17 and the film is shielded from light. Therefore, even if the lens barrel 100 is attached or detached in this state, the film is not exposed undesirably. The open / close arms 18 and 19 are shown in FIG.
When rotating from the 0 position in the clockwise direction in the drawing, the light blocking member 20 is opened. That is, as shown in FIG. 12, the light shielding plates 15 to 17 are folded and retracted from the aperture 25, and the light shielding of the film is released.

A cam portion 1 provided on the inner surface of the operating member 21.
2c includes a protrusion 18b protruding from the opening / closing arms 18 and 19.
A cam surface 21d that engages with the cam surface 21d is formed.
Is composed of two horizontal planes having different height positions and a slope connecting the two horizontal planes. When the operating member 21 is at the A position (lens eject position) and the B position (off position) in FIG. 9, the protrusion 18b is supported on the upper horizontal surface as shown in FIGS. Arm 1
The clockwise rotation of 8 and 19, that is, the movement of the light blocking member 20 to the open position is prevented. When the operating member 21 is operated to the C position (ON position), the urging force of the spring 24 causes the protrusion 18b to relatively move from the upper horizontal plane to the lower horizontal plane through the slope, and as shown in FIG. To the light blocking member 2
0 moves to the open position.

A rack gear 21a is provided on the inner surface of the operating member 21.
And the rack gear 21a meshes with the gear portion 14b formed on the set cylinder 14 described above. Therefore, as the operation member 21 is operated, the gears 21a, 14
The setting tube 14 rotates around the optical axis via b.

In FIG. 10, 22 is an encoder brush integrated with the operating member 21, and 23a, 23b and 23c are substrates 23.
It is a conductive pattern formed on the upper part, and the brush 22 can slide on the pattern when the operation member 21 is operated. The pattern 23a is grounded, and the patterns 23b and 23c are connected to the PU 301 in FIG. Operation member 2
When 1 is at the positions A, B and C in FIG. 9, the brush 22 and the conductive patterns 23a, 23b and 2 are provided.
3 has a positional relationship shown by Pa, Pb, and Pc in FIG. 14, respectively, and at this time, the levels of the patterns (hereinafter, referred to as switches) 23b and 23c change as shown in the table of FIG.

In FIG. 10, reference numeral 41 is a first locking lever rotatable about a shaft 41a, 42 is a combination magnet provided near the locking lever 41, and the locking lever 41 is shown by a spring 46. It is biased clockwise. An engaging claw 41b engageable with the engaging portion 21e of the operating member 21 is provided at one end of the engaging lever 41, and an armature 43 attracted to the combination magnet 42 is fixed at the other end. When the operating member 21 is operated from the B position to the C position, the locking lever 41 is rotated to the position shown in FIG. 12 by the engaging portion 21e of the operating member 21. At this time, the armature 43 is attracted to the magnet 42. Held in that position. At this position, the engagement of the engaging portion 21e and the locking claw 41b prevents the operation member 21 from moving from the position B to the position A.

Reference numeral 44 is a second locking lever which is rotatable about the shaft 44a and is biased by a spring 45 in the counterclockwise direction in the drawing. The arm 44 is attached to one end of the lever 44.
b is provided, and a locking portion 44c is provided at the other end in a protruding manner. As shown in FIGS. 10 and 11, the locking portion 44c
Is located in the movement path of the cam portion 21c, the operating member 21 is contacted by the contact between the locking portion 44c and the cam portion 21c.
When the lever 44 is rotated until the operation from the B position to the C position is blocked and the locking portion 44c is retracted from the movement path of the cam portion 21c as shown in FIG. 12, the operation member 21 moves from the B position to the C position. Operation is permitted.

The arm 44b partially projects in the movement path of the lens barrel 100, and when the lens barrel 100 is retracted from the position of FIG. 3 to the position of FIG. 4, the lever 44 is partially moved by the lens barrel 100. It is rotated to the position shown in FIG.
Therefore, when the lens barrel 100 is not attached,
The operating member 21 can be operated only up to the B position, and the operating member 2
There is no possibility that the light shielding member 21 is undesirably opened and the film is exposed by the erroneous operation of 1.

FIG. 16 is a block diagram of the control system of the camera in this embodiment. The CPU 301 that controls the sequence of the entire camera includes various switches described above, that is, switches SW1 and SW2 for detecting the position of the zooming unit 110, switches 23b and 23c for detecting the position of the operation member 21, and a zoom. The up / down switches ZUS and ZDS are connected, and the combination magnet 42 is connected. Further, the shutter 301, the focus motor 303, and the zoom motor 304 are connected to the CPU 301 via the MDIC 302 and the flexible printed circuit board 32, and the photometric device 305 for detecting the subject brightness.
And a distance measuring circuit 306 for detecting the subject distance are connected.

Next, the operation of the embodiment will be described with reference to FIGS. When the lens barrel is not attached, the zoom unit 110 is in the retracted position and the barriers 51 and 52 are closed. At this time, the operation member 21 on the camera body 40 side
Is in the A position, the light blocking member 20 is closed as shown in FIG.
The positional relationship between the first locking lever 41 and the engaging portion 21e of the operating member 21 is as shown in FIG. 19 (a). As shown in FIG. 3, when the mount 11 of the lens barrel 100 is mounted on the mount 13 on the camera body 40 side and the operation member 21 is slid to the B position, the rack 21c and the gear 14 are moved.
The set cylinder 14 is rotated in a predetermined direction by the engagement of b.
Along with this, the cam follower 13a of the mount 13 moves in the guide groove 12a while moving the cam groove 14a from the position Ra to the position Rb in FIG. 18B, and the lens barrel 100 is drawn to the position shown in FIG. .

As the lens barrel 100 is pulled in, a part of the lens barrel 100 abuts on the arm 44b of the locking lever 44 and rotates the lever 44 in the clockwise direction in the figure against the biasing force of the spring 45. To move. As a result, the locking portion 44c retracts from the movement path of the cam portion 12c, and the operation member 21 can be operated to the C position. Although FIG. 11 shows a state in which the lever 44 is not rotated, that is, a state in which the operating member 21 cannot be operated up to the C position, this is the lens barrel 110.
1 shows a state in which the operating member 21 is operated to the B position without mounting the lens barrel 110, and FIG.
The lever 44 rotates as shown in FIG.

On the other hand, the protruding portion 18b of the opening / closing arm 18 of FIG.
Moves relatively on the cam surface 21d of the operating member 21 from the position Qa to the position Qb in FIG. 20A, but since the height position thereof does not change, the open / close arms 18 and 19 do not rotate and the light shielding member 20 holds the closed position. The engaging portion 21e of the operating member 21 moves to the position shown in FIG. 19B, but the locking lever 41 is held at the position indicated by the chain double-dashed line. Switch 23
b and 23c are both "L" as shown in FIG.
As a result, the CPU 301 recognizes that the operating member 21 has reached the position B and activates the control program shown in FIGS. 17 and 18 (step S1).

In step S2 of FIG. 17, the switch 23
It is determined whether b is "L" and the switch 23C is in the "H" state, that is, whether the operating member 21 is operated from the B position to the C position. If step S2 is denied, the process stays at step S2, and if affirmed, the process proceeds to step S3.

When the operating member 21 is operated from the B position to the C position, the cam follower 13a of the mount 13 moves in the cam groove 14a to the position Rc in FIG. Since the cam groove 14a extends in the circumferential direction, the position of the lens barrel 100 in the optical axis direction does not change. On the other hand, the protrusion 18b of the opening / closing arm 18 is
The cam surface 21d is relatively moved on the cam surface 21d to the position Qc in FIG. 20A. At this time, the projecting portion 18b descends along the slope due to the urging force of the spring 24, so that the opening / closing arms 18 and 19 rotate to block light. The member 20 is driven to the open position. Further, the engaging portion 21e of the operating member 21 moves to the position of FIG. 19 (c),
At that time, the engaging portion 21e contacts the other end of the locking lever 41 to rotate the lever 41 counterclockwise against the biasing force of the spring 46. As a result, the armature 43 at the other end of the lever 41 is attracted to the combination magnet 42, and the lever 41 is held at the position (locking position) shown in FIG. 19C.

In step S3, the zooming unit 1
The zoom motor 304 is rotated in the forward direction to feed 10. The driving force of the zoom motor 304 is the coupling gear 31,
It is transmitted to the cam barrel 7 via 10, and the zooming unit 110 is delivered as described above by the rotation of the cam barrel 7. At this time, the arm 53c of the drive ring 53 is mounted on the mount 11
Since it is separated from the drive ring 53, the drive ring 53 is rotated by the urging force of the spring 57 to open the barriers 51 and 52.

In step S4, the switch SW described above is used.
It is determined whether both 1 and SW2 are in the “L” state, that is, whether the zooming unit 110 is driven to the wide-angle end position (FIG. 6). If step S4 is denied, the process stays at step S4, and if affirmed, the process proceeds to step S5 to stop the zoom motor 304.

In steps S6 to S9, zoom up /
Performs zoom-up processing and zoom-down processing by operating the down switches ZUS and ZDS. That is, while the zoom-up switch ZUS is being operated, the zoom motor 304 is normally rotated to extend the zooming unit 110, and while the zoom-down switch ZDS is being operated, the zoom motor 304 is reversely rotated to move the zooming unit 110. Carry over. In addition, zoom down switch ZDS
The zoom-down by the operation is up to the wide-angle end position, and is not moved from the wide-angle end position to the retracted position side. Further, if the release switch 203 is operated during this period, shooting is performed.

If none of the switches ZUS, ZDS and the release switch 203 is operated, the process proceeds to step S10 in FIG. 17 and it is determined whether or not both the switches 23b and 23C are in the "L" state, that is, the operating member 21 is C. It is determined whether or not the operation has been performed from the position to the B position. If step S10 is denied, the process returns to step S6, and if affirmed, the process proceeds to step S11.

By operating the operating member 21 to the B position, the cam follower 13a of the mount 13 returns to the position Rb,
Further, the protrusion 18b of the opening / closing arm 18 rides on the slope of the cam surface to return the light shielding member 20 to the open position. At the beginning of the operation to the B position, since the locking lever 41 is in the locking position, the operation member 2
If you continue to operate 1 from position B to position A,
As shown by the solid line in FIG. 19B, the locking claw 41b engages with the engaging portion 21e of the operating member 21, and the operation of the operating member 21 to the position A is mechanically blocked. That is, when the zooming unit 110 is located anywhere from the wide-angle end position to the telephoto end position, the lens barrel 100 is moved to the position shown in FIG.
Cannot be moved to the position (the position where the lens barrel 100 can be attached and detached).

In step S11, the zoom motor 304
Is reversed and the zooming unit 110 is retracted. In step S12, both switches SW1 and SW2 are "H".
Whether or not the state has been reached, that is, zooming unit 1
It is determined whether 10 has moved to the retracted position. If step S12 is negative, the process stays at step S12, and if positive, the process proceeds to step S13 to stop the zoom motor 304. When the zooming unit 110 is driven to the retracted position, the tip of the arm 53c of the drive ring 53 rides on the lens mount 11 by the slope portion, the drive ring 53 rotates, and the barriers 51 and 52 open.

In step S14, the combination magnet 42 is energized to release the attraction of the armature 43. As a result, the locking lever 41 is rotated by the biasing force of the spring 46 to the position shown by the chain double-dashed line in FIG.
The engagement between the locking claw 41b and the engagement portion 21e of the operation member 21 is released. Therefore, the operating member 21 moves from the B position to the A position.
It can be operated in any position.

In step S15, it is determined whether the switch 23b is in the "H" state and the switch 23c is in the "L" state, that is, whether the operating member 21 is operated to the A position. Returning to S2, if affirmative, the processing is ended. From the B position of the operating member 21 to A
When the lens barrel 10 is moved to the position, the lens barrel 100 is pulled out to the position shown in FIG.
0 can be removed. Also, each member returns to the state shown in FIG.

As described above, in this embodiment, the removal of the lens barrel 100 is prohibited except when the zooming unit 110 is in the retracted position, in other words, when the lens barrel 100 is most contracted. It Similarly, removal of the lens barrel is prohibited except when the barriers 51 and 52 are in the closed position.

In the structure of the above embodiment, the mount 13 on the camera body 40 side is the mounting portion, the locking lever 41 as the locking member, the combination magnet 42 as the control device, and the CPU 301 are the prohibition device, and the CPU.
301 and the zoom motor 304 constitute a drive mechanism and a zooming drive mechanism, and the cam groove 14a, the guide groove 12a and the cam follower 13a constitute a lens barrel drive mechanism. Further, the position of the lens barrel 100 in FIG. 3 corresponds to the allowable position, the position of the lens barrel 100 in FIG. 4 corresponds to the blocking position, and the position of the locking lever 41 in FIG. 12 corresponds to the first position. The position of the locking lever 41 in FIG. 10 corresponds to the second position, respectively.

In the above, the zooming unit 110 is used.
However, the present invention can be applied to a lens barrel in which the wide-angle end position is in the most contracted state. In this case, removal of the lens barrel may be prohibited except at the wide-angle end position. Further, the contraction of the lens is not limited to zooming and may be focusing. Furthermore, the configuration of the prohibition device and the configuration of the zooming drive mechanism are not limited to those in the embodiment.

[0045]

According to the first aspect of the invention, the taking lens barrel is prohibited from being removed except when the mounted taking lens barrel is contracted most. Is not removed from the camera body while it is extended, the storage space for the lens barrel itself is small, and the possibility of hitting other objects when carrying is reduced. In particular, in the case of a zoomable lens barrel, the length of the lens barrel greatly differs between when contracted and when it is expanded, so the effect of applying the present invention is more remarkable. If the lens barrel is driven to the most contracted state by the power-off operation, the lens barrel can be always attached when the power is off, which is convenient when only the lens is replaced without taking a picture. According to the invention of claim 8, the removal of the taking lens barrel is prohibited except when the barrier is in the closed position. Therefore, the taking lens barrel is removed from the camera body with the barrier open. It is possible to prevent the lens from being damaged when the lens barrel is used alone. If the barrier is driven to the closed position by the power-off operation, the lens barrel can be always attached when the power is off, which is convenient when only the lens is exchanged without photographing.

[Brief description of drawings]

FIG. 1 is a perspective view showing the external appearance of a lens-replaceable camera according to an embodiment of the present invention, showing a state in which a lens barrel is not attached.

2 is a cross-sectional view showing an internal configuration of the camera of FIG.
The state where the lens barrel is not attached is shown.

FIG. 3 is a view similar to FIG. 2, showing a state in which a lens barrel is mounted.

FIG. 4 is a view similar to FIG. 2, showing the lens barrel retracted into the camera body.

FIG. 5 is a view similar to FIG. 2, showing a state in which the zooming unit is extended to the telephoto end position.

FIG. 6 is a view similar to FIG. 1, showing a state in which the zooming unit is extended to the wide-angle end position.

FIG. 7 is a diagram illustrating an opening / closing mechanism of a lens barrier,
The state where the barrier is closed is shown.

FIG. 8 is a view similar to FIG. 7, showing a state in which the barrier is open.

FIG. 9 is a diagram showing an operation member on the bottom surface of the camera.

10 is a perspective view showing a drive mechanism such as a light shielding member and a locking lever, and shows a state in which the operation member is at the position A in FIG.

FIG. 11 is a view similar to FIG. 10, showing a state in which the operation member is in the B position.

FIG. 12 is a view similar to FIG. 10, showing a state in which the operation member is in the C position.

FIG. 13 is a diagram illustrating a position detection mechanism of a zooming unit.

FIG. 14 is a diagram illustrating an operation position detection mechanism of an operation member.

FIG. 15 is a diagram illustrating a state of a switch corresponding to a position of an operation member.

FIG. 16 is a block diagram showing a control system of the camera.

FIG. 17 is a flowchart illustrating the operation of the embodiment.

FIG. 18 is a flowchart following FIG. 17;

FIG. 19 is a diagram for explaining the operation of the locking lever in association with the operation of the operation member.

FIG. 20 is a diagram for explaining the operations of the light blocking member and the lens barrel in association with the operation of the operation member.

[Explanation of symbols]

1 First lens group 2 Second lens group 3 First lens frame 3a, 4a Cam follower 4 Second lens frame 5 lens room 6 lens shutter 7 Cam tube 7a, 7b Cam groove 8b Guide groove 8 fixed cylinder 10,31 Coupling gear 11 lens mount 12 guide tubes 12a guide groove 13 Camera body side mount 13a Cam follower 14 set tube 14a Cam groove 20 Light-shielding member 21 Operation member 40 camera body 41,44 Locking lever 42 combination magnets 51,52 lens barrier 53 Drive ring 100 photography lens barrel 110 Zooming unit 301 CPU 304 zoom motor

─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP-A-56-91224 (JP, A) JP-A-5-232565 (JP, A) JP-A-8-122617 (JP, A) JP-A-7- 120662 (JP, A) JP-A-7-110446 (JP, A) JP-A-7-92537 (JP, A) Actual development 6-25839 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 5/00 G02B 7/02 G03B 11/04 G03B 17/14

Claims (12)

(57) [Claims] 1. A mounting portion to which a photographic lens barrel that is expandable / contractible in the optical axis direction of the photographic lens is detachably mounted; and, except when the mounted photographic lens barrel is most contracted. An interchangeable lens camera, comprising: a prohibition device that prohibits removal of the taking lens barrel from the mounting portion. 2. A driving mechanism for driving the photographing lens barrel to the most contracted state when the power is turned off except when the mounted photographing lens barrel is contracted most. The interchangeable lens camera according to claim 1. 3. The lens-replaceable camera according to claim 1, wherein the taking lens barrel includes a zooming unit that is capable of expanding and contracting with respect to the barrel body for changing a focal length. 4. The zooming unit is driven between a telephoto end position most extended from the lens barrel body and a wide-angle end position contracted from the telephoto end position in response to a zooming operation, and in response to a collapsing operation. And further comprising a zooming drive mechanism for driving the zooming unit to a retracted position which is further contracted from the wide-angle end position, wherein the prohibiting device is provided with the photographing lens mirror except when the zooming unit is in the retracted position. 4. The removal of the cylinder from the mounting portion is prohibited.
The interchangeable lens camera described in. 5. The taking lens barrel is between a permissible position for allowing the taking lens barrel to be removed from the mounting portion and a blocking position for preventing the taking lens barrel from being removed from the mounting portion. Further, the prohibition device is configured to move the photographing lens barrel from the blocking position to the allowable position except when the mounted photographing lens barrel is contracted most. The interchangeable lens camera according to claim 1, wherein the camera is prohibited. 6. The lens barrel drive mechanism is configured to drive the taking lens barrel from the blocking position to the allowable position in conjunction with a lens barrel removing operation of an operating member, and the prohibiting device is the mounting device. The lens-replaceable camera according to claim 5, wherein the operation of removing the lens barrel of the predetermined operation member is prohibited except when the taken lens barrel is contracted most. 7. The operating device is configured to release the engagement between the operating member and a first position at which the operating member is engaged to prohibit the lens barrel detaching operation of the operating member. And a locking member that is movable to a second position that allows the lens barrel removal operation, and the locking member is set to the first position except when the mounted photographing lens barrel is most contracted. 7. The interchangeable lens according to claim 6, further comprising a control device that holds and drives the locking member to the second position when the taking lens barrel is in the most contracted state. Camera. 8. A mounting portion to which a photographic lens barrel having a barrier that can be opened and closed between a closed position that covers the front surface of the photographic lens and an open position that retracts from the front surface of the photographic lens is detachably mounted, A lens interchangeable camera, comprising: a prohibition device that prohibits removal of the taking lens barrel from the mounting portion except when the barrier is in the closed position. 9. The interchangeable lens according to claim 8, further comprising a drive mechanism that drives the barrier to a closed position when a power-off operation is performed except when the barrier is in the closed position. Camera. 10. The taking lens barrel between an allowable position for allowing the taking lens barrel to be removed from the mounting portion and a blocking position for preventing the taking lens barrel from being removed from the mounting portion. And a prohibiting device that prohibits movement of the taking lens barrel from the blocking position to the allowable position except when the barrier is in the closed position. The interchangeable lens camera according to claim 8. 11. The lens barrel drive mechanism is configured to drive the taking lens barrel from the blocking position to the allowable position in conjunction with a lens barrel removing operation of an operating member, and the prohibiting device is configured to operate the barrier. 11. The interchangeable lens camera according to claim 10, wherein the lens barrel detaching operation of the predetermined operating member is prohibited except when is in the closed position. 12. The operating member is configured to release the engagement between the operating member and a first position at which the operating member is engaged to prohibit the lens barrel removal operation of the operating member. A locking member operable to a second position that allows the lens barrel removal operation, and holding the locking member in the first position except when the barrier is in the closed position, The interchangeable lens camera according to claim 11, further comprising a control device that drives the locking member to the second position as the barrier moves to the closed position.