JPH0518725Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a zoom lens barrel having a macro photography function, and more particularly, to a zoom lens barrel that obtains a macro photography state by operating an operating member. .

[Prior Art] Conventionally, as a zoom lens barrel with a macro photography function used in photography devices such as still cameras and movie cameras, zooming is performed by rotating a zoom ring. It is known that the macro area is transferred to the macro area by further rotating the area by a certain angle (for example, see Japanese Patent Laid-Open No. 53-91729). In such a zoom lens barrel, as shown in FIG.
Above, the direction of arrows a and b perpendicular to the optical axis O from the wide end is continuous with the zoom range 123a from the telephoto (hereinafter referred to as tele) side (T) to the wide angle (hereinafter referred to as wide) side (W). Macro area 1 extending along
A cam groove 123 for a compensator is formed with a cam groove 123 for a variator having a cam groove 23b, and a cam for a compensator also has a macro area 124b at a wide side end that is continuous with a zoom area 124a from a telephoto side to a wide side and is inclined with respect to the optical axis direction. A groove 124 is formed. By rotating this cam ring 122 in the direction of arrow a by operating the zoom ring, the cam groove 123 for the variator and the cam groove 123 for the compensator
A cam pin (not shown) fitted into each moves from the wide position to the macro area. Cam ring 12
When 2 is rotated in the direction of arrow b, the macro area shifts to the zoom area. In the macro area, even if the cam ring 122 rotates, the variator lens integrated with the cam pin does not move in the optical axis direction shown by arrows c and d, and the compensator lens moves in the macro area 12 of the cam groove 124.
According to the inclination of the lens 4b, the lens is extended forward along the optical axis O as indicated by the arrow c, thereby entering the macro photography state.

[Problems to be solved by the invention] By the way, the above-mentioned cam groove has a continuous zoom range and a macro range, and by rotating the zoom ring beyond the zoom range, the zoom state can be changed to the macro shooting state. Therefore, it is normally not possible to shift to the macro range unless an operating member such as a push button for regulating the rotational position is operated.

However, the photographer may inadvertently push the operating member during zooming, and in such cases, there is a problem in that the zoom lens barrel enters the macro photography state even though macro photography is not intended.

The present invention was developed with a focus on these problems, and provides a zoom lens mirror with a macro photography function that prevents the user from inadvertently switching from a zoom photography state to a macro photography state due to an erroneous operation. There is a tube to be provided.

[Means and effects for solving the problem] This zoom lens barrel having a macro photography function has four groups including a focus lens group, first and second movable lens groups, and a fixed lens group. In a zoom lens barrel that has a lens configuration and performs zoom photography and macro photography by changing the relative positions of the first and second movable lens groups, the first and second movable lens groups move the first and second movable lens groups. A stopper provided between the zoom ring and the fixed frame that interlocks the cam ring having two cam grooves limits the continuous rotation range of the zoom ring to the zoom adjustment range, and the stopper can be operated from the outside. , the rotational position of the zoom ring can be moved from the zoom adjustment range to the macro adjustment position, and when the zoom ring reaches the macro adjustment position, the zoom ring is brought into a state in which it is interlocked with the second movable lens group by the transmission member; Only when the zoom ring is in the macro adjustment position, the transmission member is moved in the optical axis direction by external operation of the operating member to enter the macro photography state.

[Examples] Hereinafter, the present invention will be further explained with reference to illustrated examples.

As shown in FIG. 5, this zoom lens barrel having a macro photography function has a focus lens group 1 that is movable relative to a fixed frame (not shown).
1, a variator lens group 12 and a compensator lens group 13, which are provided to be moved in the optical axis direction by rotating a zoom ring (not shown) that is rotatably provided around a fixed frame. , a master lens group 14 for imaging fixed to the fixed frame;
The variator lens group 12 and the compensator lens group 13 are arranged along variator cam grooves and compensator cam grooves formed in a cam ring (not shown) that interlocks with the zoom ring. Zooming is performed by appropriately moving in the optical axis direction.

1 to 4 show a part of a zoom lens barrel having a macro photographing function, showing an embodiment of the present invention. 1 and 2 show the state immediately before the macro photography state, and FIGS. 3 and 4 show the zoom photography state. In these figures, the focus lens group 11 (see FIG. 5) and the focus frame, the variator lens group 12 (see FIG. 5) and the variator frame, and the master lens group 14 have the same structure as the well-known structure. Therefore, illustration is omitted to avoid complicating the explanation and drawings. 1 and 3 are views of the zoom lens barrel cut along a plane perpendicular to the optical axis O and viewed from the front. A cam ring 22 rotatable about the optical axis O is fitted into the inner periphery of the fixed frame 21 .
As shown in FIG. 8, this cam ring 22 has a variator cam groove 23 and a compensator cam groove 24 formed therein. Regarding the variator cam groove 23, as with the variator cam groove 123 in the conventional zoom lens barrel shown in FIG. , macro area 2 along the b direction
In the compensator cam groove 24, a macro area 24b is formed at the wide side end of the zoom area 24a, extending forward along the optical axis direction as indicated by arrow c. A cam pin 26 implanted on the outer periphery of the compensator frame 25 is fitted into the compensator cam groove 24, and when the cam pin 26 moves in the cam groove 24, a roller 2 is rotatably provided on the outer periphery of the cam pin 26.
7 is adapted to roll into contact with the cam groove 24 (see FIGS. 1 and 4). The compensator frame 25 consists of two guide rods 28, 2 provided parallel to the optical axis O.
9 so as to be slidably supported. This guide rod 2
The front ends of 8 and 29 are supported by a support plate 31 fixed to the fixed frame 21 by a presser ring 30, and the rear ends are supported by the fixed frame 21.

The cam ring 22 has zoom pins 32 (third and fourth pins).
(see figure) is fixedly installed, the zoom pin 32 passes through a notch 21c formed in the fixed frame 21, and a zoom ring 3 rotatably disposed around the outer periphery of the fixed frame 21.
It fits into the engagement groove 33a on the inner circumference of No.3. Therefore, when the zoom ring 33 is rotated about the optical axis O in the directions of arrows a and b, the cam ring 22 is rotated in the directions of arrows a and b in conjunction with the zoom ring 33, thereby performing zooming. In zooming, by rotating the cam ring 22 in the directions of arrows a and b, a cam pin integrated into the variator frame (not shown) moves the zoom area 23a of the cam groove 23 for the variator, and the zoom area 24a of the cam groove 24 for the compensator is moved. This is done by moving a cam pin 26 integrated with the compensator frame 25.

The zoom ring 33 is provided with a zoom knob 34 (a first,
(See Figure 3). A zoom stopper 35 is disposed within a zoom knob 34 that is integral with the zoom ring 33 and is movable in the radial direction of the zoom ring 33. The zoom stopper 35 is moved toward the optical axis O by a spring 36 loaded inside the zoom knob 34, so that the zoom ring 3
3, and a stopper operation part 35 having the same diameter as the zoom knob 34 is provided at the outer end.
a is fixed. The inner end of the zoom stopper 35 is fitted into the zoom area groove 21a, which is a first zoom area groove, formed on the outer peripheral surface of the fixed frame 21, or into the macro area groove 21b, which is a macro fixing groove, by the biasing force of the spring 36. By operating the stopper operating portion 35a at the other end of the zoom stopper 35 against the biasing force of the spring 36, the inner end of the zoom stopper 35 is moved into the zoom area groove 21.
a, or the macro area groove 21b. That is, in FIG. 1, the zoom stopper 35 is a macro area groove 21b which is a macro fixing groove.
Since the zoom ring 33 is rotated in the direction of arrow b while the stopper operation part 35a is pulled against the spring 36, the zoom stopper 35 moves into the zoom range groove which is the first zoom range groove. The inner end of the zoom stopper 35 can be fitted into the zoom area groove 21a at a position opposite to the zoom stopper 21a. When the zoom stopper 35 is fitted into the macro area groove 21b, the zoom ring 33 and the cam ring 22 are fixed at a predetermined rotational position relative to the fixed frame 21, and when the zoom stopper 35 is fitted into the zoom area groove 21a, The zoom ring 33 and the cam ring 22 rotate relative to the fixed frame 21 for zooming within the range in which the zoom stopper 35 moves in the zoom range groove 21a.

The zoom ring 33 is located on the left side when viewed from the front, that is, approximately 180 degrees from the position of the zoom knob 34.
A macroknob 38 is disposed at an opposing position (see FIGS. 1 and 3). Normally, photographers hold the grip on the camera body with their right hand, and hold the zoom ring with their left hand.
3, the zoom knob 34 is located at a position where it can be easily operated, whereas the macro knob 38 is located at a position where it is not operated unless the photographer is conscious of operating it. The macro knob 38 is a long groove 33b formed in the zoom ring 33 (see Fig. 2).
It is said that it is possible to freely move within the range of , in the directions of arrows c and d parallel to the optical axis O. A macro stopper 39 is provided within the macro knob 38 and is movable in the radial direction of the zoom ring 33.
is installed. The macro stopper 39 is biased by a spring 40 elastically loaded within the macro knob 38 so that a stopper operating portion 39a fixed to the outer end thereof projects from the outer circumferential surface of the macro knob 38 in normal life. The inner end 39b of the macro stopper 39 is formed into a disk shape, and when the zoom ring 33 is rotated for zooming, it faces the zoom area groove 21d, which is the second zoom area groove formed on the fixed frame 21, and faces the first, second zoom area groove 21d. As shown in Figure 2, the zoom stopper 35 is connected to the macro area groove 21.
When facing b, the inner end 3 of the macro stopper 39
9b is arranged to face a macro start position 21d ₀ which is bored deeper adjacent to the wide end of the zoom range groove 21d. Continuing from this macro start position 21d ₀ , a second,
As shown in FIG. 6, a semi-circular macro locking groove 21e for locking the inner end 39b of the macro stopper 39 is formed. In addition, fixed frame 2
The concave portion 21f on the top 1 is a portion into which the shaft portion of the macro stopper 39 is fitted when the inner end 39b is fitted into the macro locking groove 21e. Therefore, when the macro stopper 39 is pushed down against the spring 40 while facing the macro start position 21d ₀ and the macro knob 38 is moved in the direction of arrow c, the inner end 39b of the macro stopper 39 engages the macro Since it fits into the stopper groove 21e, even if the macro stopper 39 is released from being pressed down in this state, the macro stopper 39 is held in the depressed state at a predetermined position.

The macro knob 3 is located at the lower end of the macro knob 38.
A macro plate 41 is fixed integrally with 8. One end of the macro plate 41 extends laterally on the outer periphery of the fixed frame 21, and a fork-shaped pin locking portion 41a for holding the cam pin 26 is formed. The pin locking portion 41a of the macro plate 41 is configured to clamp the cam pin 26 when the zoom ring 33 is rotated most in the direction of arrow a with respect to the fixed frame 21, as shown in FIG.

Next, the operation of the zoom lens barrel of the above embodiment will be explained.

When performing a zoom operation, the user grasps the zoom knob 34 and rotates the zoom ring 33. At this time,
When the zoom ring 33 is in the zoom range, the zoom stopper 35 moves toward the zoom range groove 21, which is the first zoom range groove.
Since the macro stopper 39 faces the zoom range groove 21d, which is the second zoom range groove, the zoom ring 33 can be rotated from the telephoto side (T) to the wide side (W). Zoom ring 3
3 is in the telephoto side (T) position (see Figs. 3 and 4), the cam ring 22 is also rotated in the direction of arrow b, and as shown in Fig. 9A, the cam ring 22 is tightly rotated in the direction of arrow b. The cam pin 26 is located at the telephoto side (T) end of the zoom range 24a of the compensator cam groove 24. At this time, the macro stopper 39 is located at the end of the zoom range groove 21d on the telephoto side. Then, by rotating the zoom ring 33 toward the wide side in the direction of arrow a, the cam ring 2
2 also rotates in the direction of arrow a, as shown in FIG. 9B, the cam pin 26 moves the zoom range 24a of the compensator cam groove 24 toward the wide side end, so that the compensator frame 25 moves into the cam groove Zooming is performed by moving in the optical axis direction according to the shape of the zoom area 24a of 24. When the cam pin 26 moves in the zoom range 24a, the macro stopper 39 moves integrally with the zoom ring 33 along the zoom range groove 21d, so during zooming, the macro plate 41 remains unchanged in the optical axis direction. The pin engaging portion 41a of the macro plate 41 is located above the starting end position of the macro area 24b of the cam groove 24.

When the zoom ring 33 is rotated to the wide side (W) end, the cam pin 26 is moved to a position 26A at the wide side (W) end of the zoom range 24a (see FIG. 9B).
Even if you try to rotate the zoom ring 33 any further in the direction of arrow a, the zoom stopper 35 will be located at the wide side (W) end of the zoom range groove 21a on the fixed frame 21, so the state will remain as it is. In this case, the zoom ring 33 cannot be rotated, and the cam ring 2
2 does not rotate, so the cam pin 26 does not enter the macro area 24b of the compensator cam groove 24.

In order to shift from the state of performing zoom photography described above to the state of performing macro photography, first, the zoom stopper 3 is inserted into the zoom range groove 21a of the fixed frame 21.
5 are opposed to each other by pulling the stopper operating portion 35a, the zoom ring 33 is further rotated in the direction of the arrow a, and the zoom stopper 35 is fitted into the macro area groove 21b. In this state, as shown in FIG. 9C, the cam pin 26 reaches the macro starting end position of the macro area 24b of the compensator cam groove 24 and is engaged with the pin engaging portion 41a of the macro plate 41. At this time, the inner end 39b of the macro stopper 39 faces the macro starting end position 21d ₀ (see FIG. 6) following the zoom range groove 21d, so after this, the stopper operating portion 39a of the macro stopper 39 is pressed down. Macro knob 3 in state
8 in the direction of arrow c, the inner end 39b of the macro stopper 39 fits into the macro locking groove 21e. Therefore, as shown in FIG. 9D, the macro plate 41 also holds the cam pin 26 in the pin engaging portion 41a.
The cam pin 26 moves in the direction of the arrow c in the engaged state, and the cam pin 26 moves in the macro area 24b of the compensator cam groove 24. As a result, the compensator frame 25 is moved by the arrow c with respect to the variator frame (not shown) which is stationary in the optical axis direction at the wide end (W) position.
The lens will be extended in the direction of the lens, making macro photography possible. The shape of the macro plate 41 shown in FIGS. 9A to 9D is shown schematically to avoid overlapping the cam groove 24 and the zoom range groove 21d.

In this way, in order to shift from the zoom shooting state to the macro shooting state, it is necessary to operate the zoom stopper 35, rotate the zoom ring 33, and then push down the macro stopper 39 and slide it forward. Therefore, unless the photographer consciously performs this macro operation, he or she cannot shift to the macro photography state. This eliminates the accident of inadvertently changing from the zooming state to the macro photography state due to an erroneous operation by the photographer.

When in the above macro shooting state, zoom ring 3
3 is not rotatable, and when shifting from this state to the zoom photographing state, first slide the macro knob 38 in the direction of arrow d, contrary to the case of the macro operation described above. As a result, the macro stopper 39
The inner end 39b moves out of the macro locking groove 21e and the macro stopper 39 rises. After this, if the zoom stopper 35 is moved out of the macro area groove 21b and faces the zoom area groove 21a, zoom shooting can be performed. In this state, the zoom ring 33 can rotate within the zoom range described above.

[Effects of the invention] As described above, according to the invention, by consciously operating two members, the stopper provided between the zoom ring and the fixed frame, and the macro operation member, it is possible to change from the zoom shooting state to the macro shooting state. Since the camera is shifted to the photographing state, there is no possibility that the lens position will be inadvertently shifted to the macro range due to an erroneous operation by the photographer during zoom photography.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of a part of a zoom lens barrel showing an embodiment of the present invention in a macro-starting end position, FIG. 2 is a side sectional view taken along the line - in FIG. 1, and FIG. 3 is a front cross-sectional view of a part of the zoom lens barrel shown in FIG. 1 in a zoom shooting state, FIG. 4 is a side sectional view taken along the - line in FIG. 3, and FIG. FIG. 6 is a schematic diagram of the optical system illustrating the lens group configuration of the zoom lens barrel.
A seventh plan view of main parts illustrating the engagement relationship between the macro stopper and the fixed frame in the zoom lens barrel.
The figure is a plan view of the macro plate in the zoom lens barrel, FIG. 8 is a developed view of the cam groove formed in the cam ring in the zoom lens barrel, and FIG. 9A
~D is a developed view showing the positional relationship between the cam pin of the compensator frame and the cam groove of the cam ring to explain the transition operation of the zoom lens barrel to the macro range, and FIG. 10 is a diagram of a conventional zoom lens barrel. FIG. 3 is a developed view of a cam groove formed in a cam ring in a cylinder. 11... Focus lens group, 12... Variator lens group (first movable lens group), 13...
Compensator lens group (second movable lens group),
14... Master lens group (fixed lens group), 2
1... Fixed frame, 22... Cam ring, 23... Cam groove for variator (first cam groove), 24... Cam groove for compensator (second cam groove), 26... Cam pin (transmission member) , 33...zoom ring, 35...
...Zoom stopper (stopper), 38...Macro knob (operation member), 39...Macro stopper (operation member), 41...Macro plate (transmission member).

Claims (1)

[Scope of Utility Model Registration Claim] A focus lens group movably provided within a fixed frame whose relative position with respect to the imaging device body is fixed, a fixed lens group fixed to the fixed frame, and the fixed frame. A zoom ring rotatably provided around the zoom ring, a cam ring interlocked with the zoom ring, a variator lens group that moves in the optical axis direction along the variator cam groove of the cam ring, and a variator lens group that moves in the optical axis direction along the variator cam groove of the cam ring. A zoom lens barrel comprising a compensator lens group that moves in the optical axis direction along a compensator cam groove, and that performs zoom photography and macro photography by changing the relative position of the variator lens group and the compensator lens group. , a first zoom area groove and a second zoom area groove, which are bored in the outer peripheral surface of the fixed frame so as to face each other in the circumferential direction, and a macro fixing groove provided in the vicinity of the first zoom area groove. and a starting end of a macro operation groove which is connected to the second zoom range groove and is located opposite to the macro fixing groove, and a starting end of the macro operation groove provided in the fixing frame in the direction of the optical axis. a macro operation groove bored toward the zoom ring; and a zoom operation knob fixed to the zoom ring, the first zoom range groove and the macro fixing groove being provided with an external operation. a zoom stopper that selectively engages with the zoom ring and restricts the rotation range for zoom adjustment and the macro fixing position; and a position opposite to the zoom stopper;
A macro operation knob provided on the zoom ring, and a macro operation knob disposed within the macro operation knob, which moves within the second zoom range groove during zoom operation, and sets the zoom stopper to the macro fixed position. a macro stopper located at the starting end of the macro operation groove and allowed to be pushed into the macro operation groove by external operation; When pushed into the operating groove,
a macro plate that engages with a cam pin fitted in the compensator cam groove and moves the compensator lens group into the macro region via the cam pin by moving the macro operation knob in the optical axis direction; A zoom lens barrel having a macro photography function.