JP2001343688A - Zoom stroboscopic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optimally maintain stroboscopic orientation characteristic in focusing at a wide end by preventing the driving of a motor for variable power utilized only when focusing at the wide end from being transmitted to a zoom stroboscope. SOLUTION: At the variable power, 1st to 3rd lens groups 13 to 15 are moved in an optical axis direction by driving a motor 20 for moving an entire group. The driving during the above period is transmitted to a stroboscopic light emission part 12 via a gear train 26, a rack plate 27 and an interlocking lever 29, and the light emission part 12 is moved with respect to a Fresnel lens 30. At the wide end, focusing is performed by driving the motor 20 and moving the lens groups 13 to 15 in an optical axis direction. A non-linking part is formed on the lever 29. The driving of the motor 20 corresponding to focus movement at the wide end is not transmitted to the light emission part 12 by the non- linking part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom strobe device used for a photographic camera, an electronic still camera or the like.

[0002]

2. Description of the Related Art Conventionally, there is known a zoom strobe apparatus which changes a strobe irradiation angle in conjunction with driving of a variable power motor for changing a lens. As a structure for changing the strobe irradiation angle, there are a structure for changing the angle of the reflector and a structure for changing the interval between the Fresnel lens exposed on the front surface and the strobe light emitting portion having the discharge tube or the reflector.

As a zoom lens, for example, Japanese Unexamined Patent Publication No.
As described in JP-A-235511, generally, in a zoom lens, one of a plurality of lens groups is used as a focusing lens, and a focus position is determined from both a zoom position and a subject distance at that time. Indexing is performed, and the focusing lens is moved to the in-focus position to perform focusing. The focusing lens is moved to the in-focus position by driving a focusing motor different from the variable power motor.However, the focusing motor is combined with a rotary encoder so that it can be moved to the in-focus position correctly. The stop control of the focus motor is performed while finely detecting the rotation angle of the motor.

In a zoom lens, when an attempt is made to move a focusing lens to a focus position with respect to a specific subject distance, the amount of movement is larger when the zoom lens is zoomed to the wide side. It tends to be smaller and larger when zoomed to the telephoto side. Therefore, conventionally, the resolution of the rotary encoder is determined so that desired accuracy can be obtained at the wide end.

However, as the zoom ratio of the zoom lens increases, the above tendency is further promoted, and a high-precision rotary encoder is required to obtain the desired accuracy at the wide-angle end. The burden increases. In addition, since the moving distance of the focusing lens is further increased on the telephoto end side, there is a problem that it takes more time for focusing. Therefore, at least at the wide end, focusing by moving all the lens units by using the driving of the variable power motor is being studied.

[0006]

However, considering the incorporation of a zoom strobe device into a camera that performs focusing using the driving of the variable-magnification motor at the wide end as described above, it is linked to the driving of the variable-magnification motor. Therefore, since the strobe irradiation angle is changed, the strobe irradiation angle is changed even during focusing at the wide end, and there is a disadvantage that the strobe light distribution characteristics at the wide end are deteriorated.

The present invention has been made in consideration of the above circumstances, and does not change the strobe irradiation angle when the magnification changing means is driven in a non-magnification driving range which does not contribute to the magnification change of the taking lens. Accordingly, it is an object of the present invention to provide a zoom strobe device in which strobe light distribution characteristics are optimally maintained.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a magnification changing means for moving a taking lens in the direction of an optical axis at the time of changing the magnification; A strobe irradiation angle changing means for changing; and when the magnification changing means is driven in a variable magnification driving range contributing to the magnification change of the photographing lens, the strobe irradiation angle changing means is continuously operated in accordance with the driving amount to change the magnification. When the magnification means is driven in a non-magnification driving range which does not contribute to the magnification change of the taking lens, there is provided interlocking means for deactivating the strobe irradiation angle changing means regardless of the driving amount.

Further, when the magnification changing means is driven in the non-magnification driving range, the photographing lens may be focused in accordance with the amount of driving. Further, the non-magnification driving range may be provided before the zooming means moves the taking lens from the wide end to the next zooming position. Further, the strobe irradiation angle changing means may change the strobe irradiation angle by moving the strobe discharge tube in the direction of the photographing optical axis behind the Fresnel lens covering the front surface of the strobe light emitting unit.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A zoom strobe device 10 is shown in FIG.
As shown in (1), the strobe light emitting unit 12 is moved in the direction of the photographing optical axis 23 to change the strobe irradiation angle in conjunction with the zoom-out operation of the zoom lens 11.

As will be described in detail later, the zoom lens 11 includes a moving barrel 16, a rotating cam barrel 17, an outer rotating barrel 18, and a fixed barrel 1 having first to third lens groups 13 to 15 built therein.
9. The rotation driving from the all-group moving motor 20 is input to the outer rotating cylinder 18. Outer rotating cylinder 1
8 is fed in the direction of the optical axis 23 with respect to the fixed barrel 19 when the rotation drive is input, and the rotary cam barrel 17 is fed out with respect to the outer rotary barrel 18 by utilizing the rotation. The moving cylinder 16 is extended with respect to the rotary cam cylinder 17.
The moving cylinder 16 has a built-in motor 21 for moving the second lens group 14 in the direction of the optical axis 23.

The all-group moving motor 20 transmits a rotational drive to the outer rotary cylinder 18 via a gear train 22. When zooming,
The zoom motor 20 is driven to change the magnification. After zooming, at the zooming position other than the wide end, the second lens moving motor 21 is driven to perform focusing. At the wide end, only the entire group moving motor 20 is driven to drive the first through the second lenses. Focusing is performed by moving the three lens groups 13 to 15 together.

The zoom strobe device 10 comprises a strobe light emitting section 12, light emitting section moving guide means, and interlocking means. The light emitting unit movement guide means includes two guide rods 2.
4 and 25 and two bearing portions 12a and 12b. The guide rods 24 and 25 are arranged substantially parallel to the optical axis 23 with a predetermined distance therebetween. Bearings 12a, 1
2b are provided on the strobe light emitting unit 12, respectively, and are slidably engaged with the guide rods 24, 25, respectively.

The interlocking means comprises a gear train 26 of a strobe system, a rack plate 27, a spring 28, and an interlocking lever 29. The gear train 26 has an input gear 26a meshed with a part of the gears constituting the gear train 22 of the photographing lens system, and an output gear 26b meshed with a rack 27a provided on a rack plate 27. The rack plate 27 is connected to the photographing optical axis 23.
Are movably supported in a direction intersecting with.

As shown in FIG. 2, the interlocking lever 29 is engaged with a part of the stroboscopic light emitting section 12 and a part of the rack plate 27, respectively.
And the strobe light emitting unit 12 is moved. The strobe light emitting section 12 has a discharge tube 12c and a reflection shade 12 inside.
d, and moves between a wide-angle irradiation position and a narrow-angle irradiation position. On the front wall of the camera body, a light collector serving as a protector is provided. As a light collector,
A convex lens or a Fresnel lens is used. In this example,
A Fresnel lens 30 is used. The wide-angle irradiation position is the position closest to the rear of the Fresnel lens 30, and is moved when the zoom lens 11 is at the wide end.
The narrow-angle irradiation position is, as shown in FIG.
, And is moved when the zoom lens 11 is at the telephoto end. The rear surface of the Fresnel lens 30 is a lens surface. The front surface may be a lens surface.

As shown in FIG. 4, the interlocking lever 29 has
A hole 29b for strobe movement and a hole 31 for whole group drive transmission are formed. A strobe moving pin 12e provided in the strobe light emitting unit 12 is engaged with the strobe moving hole 29b in the rotation direction of the interlocking lever 29. The all-group drive transmission hole 31 is provided with the all-group drive transmission pin 2 provided on the rack plate 27.
7b is engaged.

The whole group drive receiving hole 31 is provided with the linking hole 3.
2 and a non-coupling hole 33. Linkage hole 32
Has a displacement in the direction of rotating the interlocking lever 29 with respect to the moving direction of the all-group drive transmission pin 27b, and when the zoom lens 11 is zoomed between the next zooming position after the wide end and the telephoto end. Is connected to the all-group drive transmission pin 27b. When the all-group drive transmission pin 27b is linked to the link hole 32, the interlock lever 29 rotates by an amount corresponding to the amount of movement of the all-group drive transmission pin 27b. The linking hole 32 is provided for the zoom lens 1 of the entire movement range L1 of the entire group drive transmission pin 27b.
The all-group drive transmission pin 27b is linked in an area L2 that moves when the magnification of 1 is changed between the zoom position next to the wide end and the telephoto end. The spring 28 urges the interlock lever 29 in a rotation direction for moving the strobe light emitting unit 12 toward the wide-angle irradiation position.

The non-coupling hole 33 is provided with the whole group drive transmission pin 27.
There is no displacement in the direction in which the interlocking lever 29 is rotated with respect to the moving direction of b, and the all-group drive transmission pin 27b is linked while the zoom lens 11 performs focus movement. The non-coupling hole 33 corresponds to the area L3 in which the entire group drive transmission pin 27b moves during the focus movement of the zoom lens 11 in the entire movement area L1. are doing. Thereby, the zoom lens 1
Even when the drive of the motor 20 for moving the entire group is transmitted to the pin 27b for transmitting the entire group while the 1 is in focus at the wide end, the pin 27b for transmitting the entire group is moved in the moving area L3 shown in FIG. Since the interlock lever 29 does not rotate, the strobe light emitting unit 12 can be maintained at the wide-angle irradiation position.

Next, the zoom lens 11 will be described.
The zoom lens 11 includes, as shown in FIG.
The rotary cam barrel 17, the rectilinear key frame 34, the rectilinear cam barrel 35, the outer rotary barrel 18, and the fixed barrel 19 are configured to move from the storage position illustrated in FIG. The magnification is changed to the telephoto end shown in FIG. 9 through the wide end shown in FIG.

The moving barrel 16 has a first lens group 13 therein,
It has a second lens holding cylinder 36 and a third lens holding frame 37.

The first lens group 13 is fixed closest to the subject within the movable barrel 16. The second lens holding barrel 36 is connected to the first lens group 13 inside the movable barrel 16.
And has a shutter block, a second lens group 14, and a second lens moving means. The shutter block includes a shutter mechanism 38 disposed behind the first lens group 13 and an actuator for driving the shutter mechanism 38.

The second lens moving means includes a guide means and a second lens moving means.
And a moving means including a motor 21 for moving the lens. The guide means guides the second lens group 14 movably in the direction of the optical axis 23 between the shutter mechanism 38 and the third lens holding frame 37. The moving unit moves the second lens group 14 along the guide of the guide unit using the driving of the motor 21. The motor 21 moves the second lens group 14 during a focus operation at a zooming position other than the wide end and an extension operation between the wide end and the storage position. The third lens holding frame 37 holds the third lens group 15, and the second lens group 1 of the inside of the movable barrel 16.
4 fixed behind.

The outer rotating cylinder 18 is arranged inside the fixed cylinder 19. The outer rotating cylinder 18 has a male helicoid 39 and a gear portion 40 formed on the outer periphery on the rear end side. The male helicoid 39 is a female helicoid 41 formed on the inner surface of the fixed cylinder 19.
To screw. The gear portion 40 meshes with a rod-shaped gear member 42 provided on the fixed cylinder 19. The gear member 42 is connected to the outer rotary cylinder 1.
8 is elongated in the direction of the optical axis 23 so that meshing with the gear portion 40 can be maintained even if the 8 moves in the direction of the optical axis 23. The drive of the all-group moving motor 20 is input to the gear member 42. On the inner surface of the outer rotary cylinder 18, a straight guide groove 43 for transmitting a rotational force to the rotary cam cylinder 17 is formed.

The rectilinear cam cylinder 35 is provided with a ring groove 44, a rotation stopping projection 45, a rectilinear guide groove 46, and a first cam opening 47. The ring groove 44 is provided at the rear end of the outer circumference, fits into a ring projection 48 provided at the inner circumference of the rear end of the outer rotary cylinder 18, and
, And supports the rectilinear cam cylinder 35 so as to be rotatable in the circumferential direction around the optical axis 23.
The rotation stopping projection 45 passes through the rear end of the outer rotary cylinder 18 and engages with a linear guide groove 49 provided on the inner surface of the fixed cylinder 19 to stop rotation of the linear cam barrel 35.

The straight guide groove 46 stops rotation of the straight key frame 34. The first cam opening 47 is a cam for moving the rotary cam barrel 17 forward and backward in the direction of the optical axis 23.

The rectilinear key frame 34 includes a ring groove 50, rotation stopping projections 51a and 51b, and an arcuate guide plate 52. The rotation stopping projection 51a is provided at one of the three divided positions in the circumferential direction, and engages with the straight guide groove 46a of the straight cam barrel 35 to stop the rotation of the straight key frame 34. The remaining rotation stop projections 51b are the rotation stop projections 5b.
1a, the width is different from that of the linear guide groove 46 of the linear cam barrel 35.
b, the rotation of the straight key frame 34 is stopped. The arcuate guide plate 52 protrudes in the direction of the optical axis 23 and stops rotation of the movable barrel 16.

The rotary cam barrel 17 is provided with a ring projection 53, a first cam follower 54, and a second cam groove 55. The ring groove 50 of the linear key frame 34 is rotatably engaged with the ring projection 53. 1st cam follower 5
4 engages with the first cam opening 47 of the rectilinear cam cylinder 35 and engages with the rectilinear guide groove 43 of the outer rotary cylinder 18 through the cam opening 47. The second cam groove 55 is provided in the movable cylinder 1
6 is moved in the direction of the optical axis 23.

The moving cylinder 16 has a second cam follower 56
And a key projection 57 are provided. The second cam follower 56 engages with the second cam groove 55 of the rotary cam barrel 17. The key projection 57 is provided on the inner surface of the movable barrel 16, and the arc-shaped guide plate 52 of the straight key frame 34 is engaged with the arc-shaped guide plate 52 to stop the rotation of the movable barrel 16. The length of the arc-shaped guide plate 52 in the direction of the optical axis 23 is such that it does not come off from the key projection 57 even when the movable barrel 16 is extended in the direction of the optical axis 23 with respect to the rotary cam barrel 17. And the second
Notches are formed on the outer periphery of the lens holding cylinder 36 and the third lens holding frame 37 to allow the arc-shaped guide plate 52 to enter.

At the time of zooming, the rotational drive is transmitted from the all-group moving motor 20 to the gear portion 40 of the outer rotary cylinder 18 via the gear member 42. The outer rotating cylinder 18 has helicoids 39, 4
It moves while rotating in the direction of the optical axis 23 according to one lead. The rectilinear cam cylinder 35 moves together with the outer rotary cylinder 18 in a state in which the rotation is stopped by the fixed cylinder 19. Rotating cam barrel 17
The rotational force is transmitted from the outer rotary cylinder 18 and moves while rotating by an amount corresponding to the displacement of the first cam opening 47 in the direction of the optical axis 23. The rectilinear key frame 34 moves in the direction of the optical axis 23 together with the rotating cam cylinder 17 in a state where the rectilinear key frame 34 is stopped by the rectilinear cam cylinder 35. The moving barrel 16 moves straight by an amount corresponding to the displacement of the second cam groove 55 in the direction of the optical axis 23 in a state of being stopped by the straight key frame 34. Accordingly, the first to third lens groups 13 to 15 move the optical axis 23 by a movement amount corresponding to the sum of the movements of the outer rotary barrel 18, the rotary cam barrel 17, and the movable barrel 16 along the optical axis 23. Move together in the direction of.

As shown in FIG. 10, an operation unit 61, a ROM 62, a distance measuring mechanism 63, a photometric mechanism 64, and the like are connected to the control unit 60 of the camera. The operation unit 61 includes a power switch, a scaling operation switch, a shutter button, and the like. The control unit 60 drives the all-group moving motor 20 in response to the turning off of the power switch, and as shown in FIG. 7, the three groups of the moving cylinder 16, the rotating cam cylinder 17, and the outer rotating cylinder 18 are formed. Set the lens barrel in the storage position where it is stored in the camera body. Then, the second lens moving motor 21 is drive-controlled in response to the turning on of the power switch, and as shown in FIG. 8, the second lens group 14 is moved to the original position closest to the subject side. This state is the zoom lens 1
1 is the wide end.

When the zooming operation is performed from the wide end state, the whole group moving motor 20 is driven to extend the three barrels of the movable barrel 16, the rotary cam barrel 17, and the outer rotary barrel 18, and FIG. The magnification is changed between the telephoto end shown in FIG.

When the power switch is turned off, the control unit 6
A value of 0 drives the whole-group moving motor 20 to return the zooming position from the current zoom position to the storage position. Thereafter, the motor 21 for the second lens is driven to move the second lens group 14 closest to the image plane.

The zoom lens 11 is a step zoom that uses only a plurality of predetermined positions in a continuous magnification range between the wide end and the tele end as magnification positions. The zoom position detecting means for detecting the zoom position includes a code plate 68 and a sliding brush 69. Code plate 68
Is provided on the inner surface of the fixed cylinder 19. Sliding brush 6
9 is provided on the straight cam barrel 35. Code plate 68
When the sliding brush 69 slides on the controller, a code signal is sent to the controller 60 at each magnification position. Control unit 60
Determines the magnification position based on the obtained code signal. Then, after the zooming operation is completed, the drive of the all-group moving motor 20 is stopped by specifying the zooming position.

The focus movement differs between the wide end and the zoom position other than the wide end. In the zoom range other than the wide-angle end, the second lens group 14 is moved in the direction of the optical axis 23. As shown in FIG. 11, a motor 2 for moving the second lens
1 transmits the drive to the screw shaft 70 via the gear train 71. The motor 21 is controlled by the control unit 60 via the driver 72. A nut portion 73 is fitted on the screw shaft 70. The nut portion 73 is provided integrally with a second lens holding frame 74 that holds the second lens group 14.
The second lens holding frame 74 includes two guide rods 75, 7
6 is movably supported in the direction of the optical axis 23 in a state where it is stopped from rotating, and moves along the guide rods 75 and 76 by the rotation of the screw shaft 70. The second lens group 1
4 is urged by a spring toward one of the directions of the optical axis 23.

The moving amount of the second lens group 14 is detected by the second lens moving amount detecting means. The second lens movement amount detection means includes an origin detection unit and a motor rotation angle detection unit. The origin detecting unit includes a light-shielding plate 77 provided on the second lens holding frame 74 and a transmission-type photosensor 78 for detecting a front edge of the light-shielding plate 77. When zooming is completed,
The second lens holding frame 74 is returned to the origin position. The photo sensor 78 is attached at a position closer to the subject. The origin position of the second lens group 14 is a position where the edge of the light-shielding plate 77 on the subject side is detected by the photo sensor 78.

The motor rotation angle detecting section is a rotary encoder 81, which has an impeller 79 having a plurality of slits and a transmission type photo sensor 80 for detecting the passage of the impeller 79 through the slits. Consists of The impeller 79 is incorporated in the gear train 71, and the motor 21
It rotates in conjunction with the drive of. The photo sensor 80 detects the number of slits while the output shaft of the motor 21 rotates. This signal is sent to the control unit 60 of the camera. The control unit 60 calculates the amount of movement of the second lens group 14 based on a signal obtained from the photo sensor 80.

At the wide end, the focusing is performed by driving the motor 20 for moving the entire group without driving the motor 21 for moving the second lens. As shown in FIG. 12, the all-group moving motor 20 transmits drive to a rod-shaped gear member 42 via a gear train 22. The motor 20 for moving the entire group includes the driver 8
4 is controlled by the control unit 60, and a rotary encoder 88 composed of an impeller 86 and a photo sensor 87 is attached to the output shaft. The rotary encoder 88 is connected to the control unit 60, and the control unit 60 detects the rotation angle of the all-group moving motor 20 based on a signal obtained from the photo sensor 87.

The state shown in FIG. 13 is the state at the wide end, and in this state, the state is focused at infinity. When focusing on a close subject from this state, the entire group moving motor 20 is driven by a predetermined amount, and the first to third lens groups 13 to 15 are moved to the optical axis 23 as shown in FIG.
In the direction of. Focus movement at the wide end
The whole-group moving motor 20 is driven by a smaller rotation amount than when zooming from the wide end to the next zoom position. Also,
At the time of the focus movement at the wide end, the backlash of the gear train 22, the play of the helicoids 39 and 41, the error of the variable magnification position detecting means, and the like are included. Therefore, focus movement at the wide end is always performed after returning to the wide end shown in FIG.

The first cam opening 47 comprises a first cam area 90 and a second cam area 91 as shown in FIG. First
The first cam follower 54 corresponds to the rotation amount of the outer rotary cylinder 18 according to the rotation of the whole group moving motor 20 from the storage position to the wide end (W2) focused to infinity. It is moved in the direction of the optical axis 23. Second cam area 9
1 denotes that the first cam follower 54 moves the optical axis 23 in accordance with the rotation amount of the outer rotary cylinder 18 corresponding to the rotation of the whole group moving motor 20 from the next zoom position Z1 at the wide end to the telephoto end T. Move in the direction. The first cam area 90 differs from the second cam area 91 in displacement in the direction of the optical axis 23.

As shown in FIG. 16, the second cam groove 55
It comprises a first cam area 92 and a second cam area 93. The first cam area 92 has a wide end (W) focused to infinity from the storage position.
The second cam follower 56 is moved in the direction of the optical axis 23 in accordance with the rotation amount of the rotary cam barrel 17 in accordance with the rotation of the whole group moving motor 20 up to 2). The second cam area 93 controls the second cam follower 56 in accordance with the rotation amount of the rotary cam barrel 17 in accordance with the rotation of the whole group moving motor 20 from the zoom position Z1 next to the wide end to the tele end T. It is moved in the direction of the optical axis 23. The first cam area 92 differs from the second cam area 93 in displacement in the direction of the optical axis 23.

The focus movement at the wide end is performed by the lead of the helicoid 39 of the outer rotary cylinder 18 and the direction of the optical axis 23 in the first cam areas 90 and 92 of the first cam opening 47 and the second cam groove 55, respectively. It is determined by combining with the combined displacement to

The ROM 62 shown in FIG. 10 stores first data for driving the whole-group moving motor 20 according to the subject distance obtained from the distance measuring mechanism 63 at the wide-angle end. Further, when the zooming position is at a position other than the wide end, the motor 21 for moving the second lens 21 according to the subject distance.
Is also stored. The second data is prepared for each zoom position.

The operation of the above configuration will be described. When the power switch is off, the zoom lens 11 is in the retracted position as shown in FIG. At this time, the rack plate 27 is located at the top, and the strobe light emitting unit 12
As shown in FIG. 2, it is set at the wide-angle irradiation position.

When the power switch is turned on, the control unit 60
Drives the second lens moving motor 21 to move the second lens group 14 toward the subject. And FIG.
The drive of the motor 21 is stopped by detecting the light shielding plate 77 by the photo sensor 78 described in the above. As a result, the second lens group 14 is moved to the origin position, and the zoom lens 11 is in the state of the wide end shown in FIG.

In this state, when the shutter button is pressed, first, the control section 60 responds to the half-pressing stroke of the shutter button, and the light measuring mechanism 64 and the distance measuring mechanism 63 respond.
And actuate. Then, when the shutter button is further pressed, the control unit 60 reads from the ROM 62 the amount of rotation of the whole group moving motor 20 according to the subject distance obtained from the distance measuring mechanism 63 in response to the full pressing stroke. The entire group moving motor 20 is driven while reading and monitoring the photo sensor 87 so as to obtain the rotation amount. This allows
The moving barrel 16, the rotary cam barrel 17, and the outer rotating barrel 18 are respectively extended toward the subject. Then, when the rotation amount according to the subject distance at that time is detected from the photo sensor 87, the driving of the all-group moving motor 20 is stopped, and the focus movement is completed. At this time, the second lens group 14
Remains at the origin position.

The drive of the whole group moving motor 20 during this time is transmitted to the rack plate 27 via gear examples 22 and 26. The rack plate 27 moves within the movement area L3 as shown in FIG. 5 by driving the motor 20 for moving all groups. However, since the non-coupling hole 33 is formed in the whole group drive transmission hole 31 of the interlock lever 29, the interlock lever 29 is moved only by the movement of the all group drive transmission pin 27b within the non-coupling hole 33. Does not rotate. In addition, the spring 28 moves in the rotational direction in which the non-coupling hole 33 is
Biases the interlocking lever 29, the interlocking lever 29
, The rotation position of the strobe light emitting unit 1 is maintained.
2 is maintained at the wide-angle irradiation position.

After that, the exposure is performed by driving the shutter mechanism 38 under the control according to the subject luminance obtained from the photometric mechanism. The strobe light emitting section 12 emits strobe light toward a subject in response to a synchro signal obtained from the shutter mechanism 38. After the completion of the exposure, the whole group moving motor 2
0 is driven in a direction opposite to the above by an amount corresponding to the rotation amount to return to the state shown in FIG. In this manner, the focus movement at the wide end is performed between the infinity in-focus state shown in FIG. 13 by driving the all-group movement motor 20 and the close-object in-focus state shown in FIG. . The strobe light emitting unit 1 is also driven by the driving of the whole group moving motor 20 during this time.
2 is maintained at the wide-angle irradiation position.

When the zoom operation is performed from the wide end, the control unit 60 drives the motor 20 for moving the entire group while monitoring the code plate 68. Then, at the time when the magnification position obtained from the code plate 68 is detected after the completion of the magnification operation, the drive of the all-group moving motor 20 is stopped. Then, when the zoom position at that time is the next zoom position after the wide end, the rotation amount of the all-group moving motor 20 during this time is larger than when focusing on a close subject when the rotation amount of the motor 20 is at the wide end. More.

The drive of the whole group moving motor 20 during this time is transmitted to the rack plate 27. At this time, since the rack plate 27 moves beyond the movement area L3, the all-group drive transmission pin 27b enters the link hole 32. Thereby, the link hole 32 rotates the interlock lever 29 by an amount corresponding to the movement amount of the all-group drive transmission pin 27b, and the strobe light emitting unit 12 moves between the wide-angle irradiation position and the narrow-angle irradiation position. It is moved to a position having an irradiation angle corresponding to the focal length at that time.

At the zoom position other than the wide end, the second distance corresponding to the object distance obtained from the distance measuring mechanism 63 in response to the full stroke of the shutter button and the current zoom position.
The controller 60 determines the amount of rotation of the lens moving motor 21 by the RO.
It reads from M62 and drives the motor 21 with the rotation amount. As a result, the second lens group 14 moves from the origin position toward the image plane. After the movement is completed, the shutter mechanism is driven and exposure is performed as described above. After the completion of the exposure, the control unit 60 controls the motor 2 for moving the second lens.
1 to return the second lens group 14 to the origin position.

In the above-described embodiment, the strobe irradiation angle is changed by moving the strobe discharge tube in the direction of the photographing optical axis 23 behind the Fresnel lens covering the front surface of the strobe light emitting unit as the strobe irradiation angle changing means. However, the present invention is not limited to this, and may be of a type in which the angle of the reflection shade is changed, or the discharge tube and the reflection shade may be fixed to move the Fresnel lens.

[0052]

As described above, in the zoom strobe apparatus of the present invention, when the zoom means is driven in a non-magnification drive range which does not contribute to zooming of the taking lens, the strobe irradiation angle changing means is independent of the driving amount. The strobe irradiation angle is not changed when the zooming means is driven in the non-magnifying movement area of the moving area for moving the photographing lens. In the moving range, the strobe irradiation angle is not changed, so that the predetermined strobe orientation characteristics can be reliably maintained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a zoom strobe device of the present invention.

FIG. 2 is an explanatory diagram showing a state of the zoom strobe device when the zoom lens is at a storage position.

FIG. 3 is an explanatory diagram showing a state of the zoom strobe device when the zoom lens is at a telephoto end.

FIG. 4 is an explanatory diagram showing an interlocking lever that constitutes the zoom strobe device.

FIG. 5 is an explanatory diagram showing a state of the zoom strobe device when the zoom lens moves to a wide-end focus position.

FIG. 6 is an exploded perspective view showing a zoom lens used in the zoom strobe device of the present invention.

FIG. 7 is a cross-sectional view showing the zoom lens device in a storage position.

FIG. 8 is a cross-sectional view illustrating the zoom lens device at a wide end.

FIG. 9 is a cross-sectional view showing the zoom lens device at a telephoto end.

FIG. 10 is a block diagram showing an electrical outline of a camera using the zoom lens device.

FIG. 11 is a perspective view schematically showing a moving mechanism for moving a second lens.

FIG. 12 is a perspective view schematically showing an overall moving mechanism for simultaneously moving each lens group.

FIG. 13 is a cross-sectional view showing a zoom lens device focused on infinity at the wide-angle end.

FIG. 14 is a cross-sectional view showing a zoom lens device focused on a close subject at the wide-angle end.

FIG. 15 is an explanatory view schematically showing a cam of a first cam opening.

FIG. 16 is an explanatory view schematically showing a cam of a first cam groove.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Strobe light-emitting part 12c Discharge tube 12d Reflector 13 First lens group 14 Second lens group 15 Third lens group 16 Moving cylinder 17 Rotating cam cylinder 18 Outer rotating cylinder 19 Fixed cylinder 20 Whole group moving motor 21 Second lens movement Motor 22, 29 Gear train 27 Rack plate 29 Interlocking lever 30 Fresnel lens

Claims (4)

[Claims] 1. A magnification changing means for moving a photographing lens in an optical axis direction at the time of magnification change, a strobe irradiation angle changing means for changing a strobe irradiation angle according to a magnification change of the photographing lens, and the magnification change means When driven in a variable magnification drive range that contributes to the magnification of the lens, the stroboscopic illumination angle changing means is operated continuously according to the amount of drive, and non-magnification drive in which the magnification means does not contribute to the magnification of the photographing lens. And an interlocking unit that deactivates the strobe irradiation angle changing unit when driven in a range regardless of the driving amount. 2. The zoom strobe apparatus according to claim 1, wherein when the zooming means is driven in the non-zooming drive range, focusing of the taking lens is performed according to the amount of drive. 3. The zoom according to claim 2, wherein the non-magnification driving range is provided before the zooming means moves the taking lens from the wide end to the next zooming position. Strobe device. 4. A strobe irradiation angle changing means for changing a strobe irradiation angle by moving a strobe discharge tube in a photographing optical axis direction behind a Fresnel lens covering a front surface of a strobe light emitting section. 4. The zoom strobe device according to any one of items 1 to 3.