JP2540388Y2 - Zoom lens camera with macro shooting function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a zoom lens camera having a macro shooting function.

"Prior art and its problems" Conventionally, in a zoom lens camera, part or all of a lens group is further extended from one end of a zooming range, generally a telephoto end, and is closer than a photographable distance in the zooming range. 2. Description of the Related Art A camera having a macro shooting function capable of shooting an object is known. However, even in a camera having this macro shooting function, there is naturally a shooting limit at a short distance, and a further short shooting cannot be performed.

[Purpose of the Invention] The purpose of the present invention is to obtain a conventional camera having a macro shooting function that can perform a close-up shooting beyond the macro shooting range.

Another object of the present invention is to provide a zoom lens camera that can reliably view the shooting area in macro shooting with a finder.

[Summary of Invention] The present invention relates to a camera provided with a zoom photographing lens and a zoom finder that changes a field of view according to the focal length of the zoom photographing lens. A first system in which at least a part of the lens system is extended from an end to enable photographing of an object at a shorter distance than a photographable distance in a zooming range.
A macro shooting mode and a second mode in which at least a part of the lens system is further extended than the first macro shooting mode to enable shooting of a subject at a shorter distance than the first macro shooting mode.
A macro shooting mode is provided, and the zoom finder is configured to reduce the magnification in conjunction with at least one of the shift of the zoom shooting lens to the first macro shooting mode and the second macro shooting mode. I have.

The first macro shooting mode of the zoom shooting lens and the second
If the magnification of the viewfinder is reduced in conjunction with at least one of the transitions to the macro shooting mode, the problem that the parallax increases and the shooting range cannot be confirmed can be solved. In other words, when the finder magnification is reduced, the finder field of view becomes wider than the actual photographic range, but the macro photographic range can be surely shown therein.

"Embodiments of the Invention" The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 shows an example of a lens configuration of a zoom photographing optical system T and a finder optical system F of a zoom lens camera according to the present invention and an example of a movement locus thereof.

The photographing optical system T includes first to third lens groups A to C, the first lens group A and the third lens group C move integrally,
With respect to the first and third lens groups A and C, the second lens group B moves in a predetermined relationship while changing the air gap, and normal zooming between wide and tele is performed. When only the second lens group B is extended forward by one step from the telephoto end, it becomes a first macro area where macro photography can be performed, and when the second lens group B is extended further forward, photography can be performed at a shorter distance than the first macro. This is two macro areas. That is, the shooting magnification increases in the order of the telephoto end, the first macro, and the second macro. Focusing is performed by moving the second lens unit B in the optical axis direction.

The finder optical system F includes four lens units, a first lens unit L1 to a fourth lens unit L4, in that order from the object side. The first lens unit L1 and the fourth lens unit L4 are fixed lenses, second and third lens units. The lens units L2 and L3 are movable zoom lenses. The second and third lens units L2 and L3 are in a normal zoom range between wide and tele,
The field of view is changed in conjunction with zooming of the photographing optical system T. On the other hand, when shifting from the telephoto end to the first macro range, the second and third lens units L2 and L3 are moved in the direction in which the finder magnification decreases, contrary to the photographing optical system T. When shifting to the second macro shooting, the second,
The third lens units L2 and L3 are moved in the direction in which the finder magnification decreases.

FIG. 2 shows an example of a change in the visual field at the telephoto end, the first macro, and the second macro. This figure shows a change in the range that can be seen through the finder, and does not change the mechanical size of the finder itself.
Now, when the normal visual field t at the telephoto end is shown by a broken line, the visual field m1 (same as above) in the first macro spreads as shown by a solid line,
The field of view m2 (same) in the second macro is further expanded as shown by the two-dot chain line. The first and second macro visual fields m1 and m2 thus widened can include a first macro and a second macro photographing region by the photographing optical system T. Then, in the viewfinder, a first macro frame m1f and a second macro frame m2f are provided to indicate where in the widened field of view are the photographing areas of the first macro and the second macro. Usually, the first macro frame m1f and the second macro frame m2f are formed slightly smaller than the actual photographing screen. Note that sf is a distance measurement frame indicating a distance measurement range of auto focus.

As described above, when the photographing range is indicated by lowering the magnification of the finder optical system F when shifting to the macro range, the image is not degraded and the macro photographing is performed at a position closer to the reference distance. Correction of diopter at the time
This can be performed automatically by moving the second and third lens units L2 and L3.

Driving Mechanism of Zoom Photographic Optical System T Next, a specific configuration example for giving the above-described movement locus to the constituent lens groups of the zoom phototaking optical system T will be described with reference to FIGS. This embodiment is characterized in that the zoom photographing optical system described above is mounted and the storage length can be shortened. 4A shows the stored state, FIG. 4B shows the shortest focus (wide) state, and FIG. 4C shows the longest focus (tele) state. FIG. 3 shows the basic structural members of the zoom lens barrel 50 in a skeleton.

First, the basic operation of this embodiment will be described. The first lens group A and the third lens group C always move integrally from the wide-angle end in FIG. 4B to the telephoto end in FIG. The first lens group A and the third lens group C are compared with the second lens group B
The zooming is performed by changing the air gap, and focusing is performed by the second lens unit B.
At the telephoto end in FIG. 4C, a state in which the second lens group B is advanced forward alone is a first macro shooting mode, and a state in which the lens group B is advanced forward is a second macro shooting mode. . This is the relationship of FIG. In this embodiment, when the first to third lens units A, B, and C are retracted from the wide end in FIG. 4B and are shifted to the storage state in FIG. Lens group A and third
The first lens group A and the second lens group B are further brought closer to the third lens group C by solving the integral movement relationship of the lens group C.

An outer helicoid 12 (inner helicoid) is fixed in front of a fixed ring 11 fixed to the camera body.
An inner helicoid (peripheral helicoid) 13 is screwed into the outer helicoid 12, and a cam ring 14 is fixed to the inner helicoid 13. As conceptually shown in FIG. 5, a gear 15 is fixed to the cam ring 14, and the gear 15 meshes with a pinion 16a of a zoom motor 16. Therefore, when the zoom motor 16 is driven, the cam ring 14
Move in the direction of the optical axis according to 13 leads. Gear 15 is
It is preferable to incline in the same direction as the mountain of the inner helicoid 13. A front cover 17 covers the outside of the outer helicoid 12.

A straight running ring 18 is fitted on the inner periphery of the cam ring 14.
The rectilinear ring 18 has a rectilinear guide plate 19 fixed to the rear part thereof. The rectilinear guide plate 19 has a part of its outer periphery engaged with a rectilinear guide groove 11 a formed in the fixed ring 11. An outer flange 18a is formed at the distal end of the rectilinear ring 18, and the cam ring 14 is restricted from moving in the axial direction between the outer flange 18d and the rectilinear guide plate 19 to be rotatable. It is stuck in. Accordingly, the rotation of the rectilinear ring 18 is restricted by the rectilinear guide plate 19, but always moves integrally with the cam ring 14 in the optical axis direction. The cam ring 14 can rotate relative to the rectilinear ring 18. The lens cover cylinder 21 is fixed to the outer flange 18a.

The first lens frame 22 to which the first lens group A is fixed is fixed to a first lens moving ring 23 via an adjustment screw 22a. A first group roller A 'is implanted at the rear of the first lens moving ring 23. The first group roller A' is
The cam ring 14 fits into the first group cam groove 14a of the cam ring 14 through a straight guide groove 18a (FIG. 3).

The second lens frame 25 to which the second lens group B is fixed is screwed to the inner helicoid 27 of the shutter block 26. The shutter block 26 is fixed to a second lens moving ring 28, and a second group roller B 'is provided at the rear of the second lens moving ring 28.
Has been planted. The second group roller B 'passes through a rectilinear guide groove 18b (FIG. 3) formed in the rectilinear
In the second group cam groove 14b.

A third group roller C 'is directly implanted in the third lens frame 30 to which the third lens group C is fixed. This third group roller C '
Is fitted in the linear guide groove 18c of the linear ring 18. However, unlike the first group roller A 'and the second group roller B', they are not fitted in the cam grooves.

As shown in FIG. 5, the first group cam groove 14a and the second group cam groove 14b have a storage section l0, a zoom section 1, and a first macro transition section.
l2 and a second macro transition section l3. The zoom section 1 is the section shown in FIG. 1, and the storage section 10 is a section in which the first to third lens groups A, B, and C are further retracted from the wide end. The first macro transition section l2 is a section in which the first lens group A and the third lens group C are fixed and the second lens group B is advanced by a small amount from the telephoto end to be in the first macro mode. is there. Also, the second macro transition section l3
Is a section in which only the second lens group B is advanced from the first macro shooting mode while the first lens group A and the third lens group C are fixed.

The inclination of the first group cam groove 14a and the second group cam groove 14b is gentle, and the inclination of both cam grooves is reversed in the first and second macro transition sections l2 and l3. This is because the vehicle moves forward by the helicoid 12 (the inner helicoid 13). That is, the amount of movement of the first lens group A (the third lens group C) and the amount of movement of the second lens group B are the combined amount of the lead (inclination) of the outer helicoid 12 and the inclination of the first group cam groove 14a and the second group cam groove 14b. Depends on The first and second cam grooves 14a of the first group
The inclinations of the macro transition sections l2 and l3 are the first and third lens groups A,
The single inclination angle does not move C. That is, this inclination angle is the same as the inclination angle of the helicoids 12 and 13 but in the opposite direction.

Between the third lens frame 30 and the first lens moving ring 23, 1
The first lens moving ring 23 follows the storage section 10 of the group cam groove 14a.
4A and 4B, an engaging portion 30a and an engaging portion 23a that come into contact with each other are provided before shifting from the storage position in FIG. 4A to the wide end state in FIG. 4B (see FIGS. 6 and 7). That is, the first lens moving ring 23 advances and retreats in the optical axis direction with the rotation of the cam ring 14 in accordance with the relationship between the first group roller A 'and the first group cam groove 14a.
The group roller A 'is in the zoom section 1 to the second section of the first group cam groove 14a.
While being located in the macro transition section l3, the engagement portion 30a
And the engaging portion 23a always contact. Therefore, the first lens moving ring 2
3 (first lens group A) and third lens frame 30 (third lens group C) move together. On the other hand, when the first group roller A 'enters the storage section 10 of the first group cam groove 14a, the third lens frame 30
Eventually, the third group roller C 'reaches the rear end of the straight guide groove 18c and stops, whereas the engaging portion 23a is connected to the engaging portion 30a.
Retreat away from alone. At this time, the second lens group B
Retreats due to the relationship between the second group roller B 'and the second group cam groove 14b,
As a result, the first to third lens groups A, B, and C are retracted as a whole, and the storage length is reduced. FIG. 3 and FIG.
FIG. 4C is a view corresponding to the stored state in FIG. 4A, and the engaging portions 23a and 30a are in contact with each other in the photographable state in FIGS. 4B and 4C.

In addition, between the second lens moving ring 28 and the third lens frame 30,
At a plurality of positions in the circumferential direction, compression springs 31 are inserted,
The third lens frame 30 is constantly urged rearward, that is, in a direction in which the engagement portion 30a comes into contact with the engagement portion 23a of the first lens moving ring 23.

As is well known, the shutter block 26 rotates the drive pin 26a by an angle corresponding to a distance signal from the distance measuring device to the subject. The drive pin 26a is connected to the second lens frame 25
When the drive pin 26a rotates, the second lens group B moves in the optical axis direction according to the inner peripheral helicoid 27. After adjusting the position of the second lens frame 25 in the optical axis direction (focus adjustment), the connecting ring 33
Fixed to 25. The shutter block 26 opens and closes a shutter blade 26b according to a luminance signal of a subject.

In the zoom lens barrel 50 having the above configuration, when the cam ring 14 is rotated forward and backward via the zoom motor 16, the cam ring 14 simultaneously moves in the optical axis direction. That is, since the cam ring 14 has the inner helicoid 13 that meshes with the fixed outer helicoid 12, the cam ring 14 moves in the optical axis direction while rotating, and at this time, the straight ring 18 also moves in the optical axis direction. .
Then, since the rotation of the straight running ring 18 is regulated by the straight running guide plate 19 and the straight running guide groove 11a, the cam ring 14 and the straight running ring 18
Relative rotation occurs between the first group cam groove 14a and the second group cam groove 14b.
Accordingly, the first lens group A and the second lens group B move in the optical axis direction.

In the third lens group C, the first group cam groove 14a of the cam ring 14 moves the first lens moving ring 23 within the storage section 10 and the engaging portion 23a is engaged with the engaging portion 30a of the third lens frame 30. Before the engagement, the third lens group C 'is stopped because it is located at the rear end of the straight guide groove 18c. It moves together with A. Therefore, in zoom section 1, 1
With a predetermined relationship based on the group cam groove 14a and the second group cam groove 14b, the first to third lens groups A, B, and C move in the optical axis direction, and zooming is performed.

At the time of transition from the zoom section 1 to the first macro transition section l2, the second group lens B advances according to the second group cam groove 14b. At this time, the first and third lens groups A and C are in the first group cam groove 14.
Do not move according to a.

Further, from the second macro transition section l2 to the third macro transition section
When moving to l3, the second group lens B follows the second group cam groove 14b.
Goes further. At this time, the first and third lens groups A and C
Does not move similarly according to the first group cam groove 14a.

Conversely, when shifting from the zoom section 1 to the storage section 10, the first lens group A and the third lens group C move integrally while the engaging section 23 a and the engaging section 30 a are in contact. But,
When the retreat of the third lens group C is limited by the rectilinear guide groove 18c, only the first lens group A retreats and the third lens group C
Approach. At this time, the second lens group B is in the second group cam groove 14b.
, And similarly approaches the third lens group C, and as a result, the storage length is reduced as shown in FIG. 4A.

FIGS. 8 and 9 show a code plate 75 and brushes ZC0, ZC1, ZC2, and GND for detecting the focal length (stop position) of the zoom lens having the above macro shooting function, and the zoom detected by the brushes. Shows code and POS.
The code plate 75 increases the focal length of the zoom lens from 38 mm to 105 mm.
As the divided focal length steps, 38, 44, 50, 5
7, 65, 72, 80, 87, 95, 100, 105 mm, 1st macro (105
mm) and 13 steps of the second macro (same as above) to obtain the focal length information. The zoom code plate 75 is fixed, for example, to the above-described cam ring 14 in the circumferential direction, and a brush in contact therewith is fixed to the straight guide plate 19.

POS indicates the next position. POS = 0 is the LOCK position,
POS = 1 is stop prohibition position, POS = 2-C is 38mm-105m
m, the 11-stage divided focal length position, POS = D is the stop prohibition position, POS = E is the first macro position (105 mm), POS = F
Indicates the second macro position (the same) (the number of POS stages is 16).

As shown in FIG. 9, the zoom code ZC adopts a relative code in which the same code appears at least twice from POS = 2 to POS = C with respect to the 16-step position.
At POS = 0, 1, D, and E, the absolute relationship with the zoom code ZC is maintained. Similarly, even when POS = F, a relative code is adopted. Therefore, for example, the zoom code ZC = 4
It appears at the positions of POS3, 7, and B. By counting the number of occurrences from the absolute code position by software,
These POSs can be detected. Of course, an absolute code having a one-to-one correspondence between each POS and the zoom code may be used.

Driving Mechanism of Viewfinder Optical System F Next, referring to FIGS. 10 to 12, the second and third lens groups will be described.
A specific configuration example for giving the movement trajectory to L2 and L3 will be described.

FIG. 10 shows a configuration in which a composite lens prism P1 and a lens prism P2 are further added to the configuration of the finder optical system F shown in FIG. 2 in order to secure an optical path length required for a real image type finder. The second and third lens groups L2 and L3 are fixed to moving frames 111 and 112, respectively, and drive pins 113 and 114 are implanted on the upper surfaces of the moving frames 111 and 112, respectively. Also, between the compound lens prism P1 and the lens prism P2,
A view frame glass L5 is provided, and the view frame glass L5 is provided.
Above, the first macro frame m1f and the second macro frame m shown in FIG.
2f and a distance measurement frame sf are drawn. An image of the objective optical system constituted by the first lens unit L1 and the lens prism P2 forms an image on the field frame glass L5, and this image is formed by the compound lens prism P1.
And an eyepiece optical system including the fourth lens unit L4.

The moving frames 111 and 112 are movably supported in the finder unit 115 in the optical axis direction. A cam plate 116 is supported on the upper part of the finder unit 115 so as to be movable in the lateral direction. Cam grooves 117 and 118 in which the driving pins 113 and 114 are fitted are formed on the cam plate 116. A rack 119 is formed in the rear portion of the cam plate 116 in a lateral direction, and the rack 119 meshes with a pinion (not shown). The pinion rotates in conjunction with the zoom operation and the macro shift operation of the zoom photographing optical system T, and the cam plate 116 moves left and right.

In the cam grooves 117 and 118, as shown in FIG.
1 (second lens unit L2) and 112 (third lens unit L3)
The storage section l0, the zoom section 1, the first macro transition section l2, and the second macro transition section l3 for moving as shown in the figure.
Is provided. The ends (boundaries) of these sections are the wide end, the tele end, the first macro, and the second macro, respectively. Therefore, by moving the cam plate 116 left and right, it is possible to provide the second and third lens units L2 and L3 with a movement locus as shown in FIG. Of course this cam plate 11
The sections l0 to l3 of the cam groove 6 correspond to the sections l0 to l3 of the cam groove of the cam ring 14 in FIG. 5, so that a finder visual field corresponding to the focal length is obtained in the zoom section. ,
In the first macro mode and the second macro shooting mode, the field of view can be widened and the shooting range can be reliably included therein.

In the above embodiment, the finder magnification is decreased in the first macro mode and the second macro photography mode, but the finder magnification may be decreased in only one of them.

In the first macro mode and the second macro shooting mode, the autofocusing by the shutter unit 26 may be performed by obtaining the respective distance measurement signals. However, especially in the second macro shooting mode, since the shooting distance is extremely short, it is difficult to obtain a distance measurement signal. Therefore, as shown in FIG. 13, a strap S generally provided on the camera body CA is provided.
Is set as the shooting distance in the second macro mode, and the distance over which the strap S is extended can be indicated as the shooting distance. That is, the subject is placed at the position P where the strap S is extended, and shooting is performed. The position of the second lens group B is controlled to a position that is focused on this shooting distance.

"Effects of the Invention" As described above, the present invention provides a normal macro shooting function (first
Macro), and the second one that enables even closer shooting
Since the macro shooting mode is provided, the convenience of the camera is increased, and a wider macro shooting function can be obtained.

Further, according to the present invention, the magnification of the finder is reduced in conjunction with at least one of the shift of the zoom photographing lens to the first macro photographing mode and the second macro photographing mode. be able to.

If the shooting distance in the second macro shooting mode is fixed and the shooting distance is indicated by the length of the strap provided on the camera body, reliable shooting can be performed even when a distance measurement signal cannot be obtained.

[Brief description of the drawings]

FIG. 1 is an optical path diagram showing an embodiment of a lens configuration of a zoom photographing optical system and a finder optical system of a zoom lens camera having a macro photographing function according to the present invention, and a movement locus thereof. FIG. FIG. 3 is a front view showing an example, FIG. 3 is a skeleton diagram schematically depicting an embodiment of a lens barrel equipped with the zoom photographing optical system of FIG. 1 by a skeleton, FIGS. 4A, 4B, and 4C are FIG. 3 is an embodiment in which the lens barrel of FIG. 3 is more specific, and is an upper half sectional view showing a stored state, a shortest focal length state, and a longest focal length state, respectively. FIG. Straight guide groove of the ring,
And FIG. 6 is a developed view showing the relationship between the first to third lens groups and the rollers, FIG. 6 is a developed view showing the relationship between the third lens frame and the second lens moving ring, and FIG. FIG. 8 is a schematic view showing a relationship between a zoom code plate and a brush used for focus (position) detection of the zoom lens camera of the present invention, and FIG. 9 shows a correspondence relationship between a zoom code and a zoom position. Fig. 10, Fig. 10 is a perspective view showing a more specific example of the finder optical system, Fig. 11 is a perspective view of a mechanism incorporating the finder optical system of Fig. 10, and Fig. 12 is a cam in Fig. 11. It is a top view of a plate. FIG. 13 is a side view showing an example of a shooting mode in the second macro shooting mode. A, B, C: lens group (zoom lens system), A ':
1st group roller, B '... 2nd group roller, C' ... 3rd group roller, 11 ... fixed ring, 12 ... outer helicoid, 13 ... inner helicoid, 14 ... cam ring, 15 ... gear, 16 … Zoom motor, 17… front cover, 18… straight running ring, 19… straight running guide plate, 22… first lens frame, 23… first lens moving ring,
25 ... second lens frame, 26 ... shutter block, 27 ...
Inner circumference helicoid, 28 ... second lens moving ring, 30 ... third
Lens frame 31 Compression spring 50 Zoom lens barrel
75: Code plate, L1, L2, L3, L4: Lens group (finder optical system), 111, 112: Moving frame, 113, 114: Drive pin, 115: Viewfinder unit, 116: Cam plate , 117, 118 ... cam groove, 119 ... rack, l0 ... storage section, 1 ... zoom section, l2 ... first macro transition section, l3 ... second macro transition section.

Claims (2)

(57) [Scope of request for utility model registration] 1. A camera provided with a zoom photographing lens and a zoom finder for changing a field of view in accordance with a focal length of the zoom photographing lens, wherein the lens is arranged from one focal length end of a zooming range of the zoom photographing lens. A first macro photography mode in which at least a part of the system is extended to enable photographing of an object at a shorter distance than the photographable distance in the zooming range; and a first macro photography mode in which at least a part of the lens system is extended further than the first macro photography mode. A second macro photographing mode that enables photographing of an object at a shorter distance than the one macro photographing mode, wherein the zoom finder is a first macro photographing lens.
A zoom lens camera having a macro shooting function, wherein a magnification is reduced in conjunction with at least one of a shift to a macro shooting mode and a second macro shooting mode. 2. The zoom lens camera according to claim 1, wherein a photographing distance in the second macro photographing mode is fixed, and a length of a strap provided on the camera body indicates the photographing distance. .