JPH06265770A - Lens shutter system zoom lens camera - Google Patents

Abstract

PURPOSE:To simplify the constitution of the periphery of a zooming photographic optical system by turnably supporting a cam ring whose movement in an optical axis direction is restricted to the fixed part of a camera body and also supporting a variable power lens group whose reverse rotation thereto is restricted on the inside diameter side of the cam ring so that it can straight advance and. retreat. CONSTITUTION:The cam ring 14 is rotatably supported on the rear fixed plate 11 and the front fixed plate 13 of a lens barrel block, and a gear 15 meshing with a pinion through a gear train is fixed on the outer periphery of the cam ring 14. Zooming cam grooves 20 and 21 for a front group and a rear group are cut in the cam ring 14. The roller 17 of a front group frame 16 and the roller 19 of a rear group frame 18 movably fitted in a guide rod 12 are fitted in the cam grooves 20 and 21. Therefore, when a lens extending lever 23a is turned in a circumferential direction so that a front group lens frame 24 is turned, a front group lens L1 is moved in the optical axis direction by following a helicoid 25. The rear group lens L2 is directly fixed to the rear group frame 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens shutter type zoom lens camera.

[0002]

2. Description of the Related Art Although a lens shutter type zoom lens camera has been proposed at the patent application level, it has not been commercialized in practice. At the product level, only the bifocal length formula that switches the focal length to long-short bifocal is proposed. However, if a lens shutter camera equipped with a zoom lens is realized, the convenience of the user will be dramatically improved.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lens shutter type zoom lens camera which has a simple structure around the zoom photographing optical system and can be commercialized.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a cam ring is rotatably supported by restraining movement in the optical axis direction on a fixed portion of a camera body, while rotation is restrained on the inner diameter side of the cam ring in the optical axis direction. At least two variable power lens groups at the front and rear are supported so as to be able to move straight forward and backward, and this cam ring is rotated by an electric drive system including a motor fixed to the camera body. A zooming mechanism that moves the variable power lens group to change the focal length is provided.
Further, it is characterized in that the foremost variable power lens group in the variable power lens group projects from the tip of the cam ring to the front of the camera body in accordance with zooming.

As described above, the cam ring whose movement in the optical axis direction is restrained is rotatably supported by the fixed portion of the camera body, while the zoom lens group whose rotation is restrained is provided on the inner diameter side of the cam ring. According to the structure that can be moved forward and backward, the zoom photographing optical system can be configured with a simple structure. Then, if the foremost variable-magnification lens unit is made to project from the tip of the cam ring to the front of the camera body during zooming, a compact zoom lens with a large zoom ratio can be obtained when stored. The present invention relates to a gear that is integrally provided on the outer periphery of a cam ring and that is rotationally driven by an electric drive system including a motor; receives the power of the motor of the electric drive system and interlocks with changes in the focal length of the zoom photographing optical system. It is preferable to further include a zoom finder optical system for changing the field of view depending on the size.

[0006]

The present invention will be described below with reference to the illustrated embodiments.
The lens shutter camera of the present invention has a lens barrel block 1 of a zoom lens, a finder and a strobe block (hereinafter simply referred to as a finder block) 2, and a light emission of a distance measuring device (AF device), as shown in FIG. A section 3, a light receiving section 4, and a zoom motor 5 for zooming are provided. These elements are fixed on a base plate 6 (see FIGS. 2 to 4) that serves as a fixed portion of the camera body.

That is, the base plate 6 includes a lens barrel supporting plate portion 6a which is perpendicular to the optical axis, a horizontal supporting plate portion 6b in which the upper end of the lens barrel supporting plate portion 6a is bent at a right angle, and the horizontal supporting plate portion. 6b
The lens barrel block 1 is supported by the lens barrel support plate portion 6a. A zoom motor 5 located at the center of the upper portion of the lens barrel block 1 is fixed to the motor support plate portion 6c. On both sides of the zoom motor 5, the light emitting portion 3 and the light receiving portion 4 fixed to the horizontal support plate portion 6b are provided. Is located. The finder block 2 is fixed to the front right side of the horizontal support plate portion 6b.
Reference numeral 6e is a gear train support plate fixed to the motor support plate portion 6c via a spacer 6f.

The lens barrel block 1 is driven by a zoom motor 5. The structure of the lens barrel block 1 is shown in FIGS.
0 will be described. In the lens barrel support plate portion 6a of the base plate 6,
The rear fixing plate 11 is fixed via the fixing screw 10.
Four guide rods 12 parallel to the optical axis and located around the optical axis are fixed to the rear fixing plate 11, and a front fixing plate 13 is fixed to the tip of the guide rod 12.
The above is the main fixing element of the lens barrel block 1.

A cam ring 14 is rotatably supported between the rear fixed plate 11 and the front fixed plate 13, and a gear 15 meshing with the pinion 7 directly or through a gear train is fixed to the outer periphery of the cam ring 14. It is fixed with a screw 15a (FIG. 6). The gear 15 may be a sector gear that covers the rotation range of the cam ring 14. The cam ring 14 is provided with front group and rear group zooming cam grooves 20 and 21. FIG. 7 is a development view of the zooming cam grooves 20 and 21, and the zooming cam groove 21 for the rear group has a wide-angle end fixed section 21a, a variable magnification section 21b, and a telephoto end fixed section 21c. On the other hand, the zooming cam groove 20 for the front group
Is an opening / closing section 20a of the barrier block 30, a lens storage section 20b, a wide-angle end fixed section 20c, a variable magnification section 20d,
It has a telephoto end fixed section 20e, a macro feeding section 20f, and a macro end fixed section 20g. The rotation angle of each of these sections depends on the opening / closing section 20a of the zooming cam groove 20,
The total angle θ1 of the lens housing section 20b and the wide-angle end fixing section 20c is the same as the angle θ1 of the wide-angle end fixing section 21a of the zooming cam groove 21, and the angle θ2 of the variable power section 20d and the variable power section 21b is the same. Yes, the total angle θ3 of the telephoto end fixed section 20e, the macro feeding section 20f, and the macro fixed section 20g is the angle θ of the telephoto end fixed section 21c.
Same as 3. The specific zooming range of this embodiment is 35 mm to 70 mm.

In the zooming cam groove 20 and the zooming cam groove 21, the roller 17 of the front group frame 16 and the roller 1 of the rear group frame 18 which are movably fitted to the guide rod 12.
9 fits. The decorative frame 22 is fixed to the front group frame 16 via fixing screws 22a, and the shutter block 23 is further fixed. The front group lens frame 24 holding the front group lens L1 is screwed to the shutter block 23 by a helicoid 25, and has an arm 24a that engages with the lens feeding lever 23a of the shutter block 23.
Therefore, when the lens feeding lever 23a rotates in the circumferential direction and the front lens group frame 24 rotates accordingly, the front lens group frame 24 moves in the optical axis direction according to the helicoid 25. The rear group lens L2 is directly fixed to the rear group frame 18.

The shutter block 23 itself is well known. With the built-in pulse motor, the lens feeding lever 2 is moved by an angle according to a distance measurement signal from a distance measurement device described later.
3a is rotated, and the closed shutter (sector) 23b is opened for a predetermined time and then closed again, and then the lens feeding lever 23a is returned to the original position. Such a shutter block 23 is disclosed in, for example, JP-A-60-225122,
It is widely known from JP-A-60-235125. The present invention basically uses such a shutter block as it is.

The barrier block 30 will now be described with reference to FIGS. This barrier block 30 is provided when the cam ring 14 is rotated within the opening / closing section 20a.
The turning force is used as a driving force to open and close the pair of barriers 31, 31 located in front of the front lens group L1. The barriers 31, 31 are pivotally attached to the front end surface of the barrier block 30 by pins 32.

The pair of barriers 31, 31 are symmetrically opposed to each other, and a barrier plate portion 31a protruding on the optical axis,
The pin 32 has a drive arm portion 31b extending on the opposite side of the barrier plate portion 31a, and the working arm 34a of the opening / closing spring 34 is engaged with the pin 33 planted in the drive arm portion 31b. The opening / closing spring 34 is made of, for example, a synthetic resin molded product, and has a working arm 34a and a Y-shaped spring arm 34b.
And a driving arm 34c, and is pivotally attached to the barrier block 30 by a pin 35. The spring arm 34b is in contact with the inner wall of the decorative frame 22, and the barrier plate portion 31a is always connected via the working arm 34a.
Gives an urging force in the direction of retracting from the optical path. The drive arm 34c is engaged with a flange portion 36a of an opening / closing pin 36 fitted in the decorative frame 22 so as to be movable in the radial direction, and the head of the opening / closing pin 36 is pivotally attached to the front fixing plate 13 by a pin 37. The free end of the interlocking lever 38 is engaged.

The opening / closing pin 36 is located at the radially projecting end by the spring force of the spring arm 34b of the opening / closing spring 34 when no external force is applied, and at this time, the barrier plate portion 31a is
Evacuate from the optical path. That is, open the barrier. On the other hand, when the opening / closing pin 36 is pushed inward in the radial direction via the interlocking lever 38, the drive arm 34c is pushed, and as a result, the barrier 31 rotates via the working arm 34a, and the barrier plate portion 3
1a is located on the optical path. That is, the front of the front lens group L1 is closed. The interlocking lever 38 is pressed by the closing projection 40 formed on the inner surface of the cam ring 14 when the cam ring 14 rotates in the section opening / closing section 20a. Therefore, the cam ring 1 by the zoom motor 5
When 4 is rotated to one rotation end, the barrier is automatically closed.

Next, the distance measuring device (AF device) will be described with reference to FIGS. Various types of distance measuring devices having the light emitting section 3 and the light receiving section 4 are known in the related art. In this embodiment, however, a position detecting element (for example, PS) is used as a light receiving element.
The type based on the principle of triangulation using D) is used. FIG. 11 is a conceptual diagram thereof, in which the light emitting unit 3 includes a light source 3a such as an LED and a light projecting lens 3b, and the light receiving unit 4 includes a PSD 4a separated from the light source 3a by a base line length L and a light receiving lens 4b. ing. The CCD 4a is composed of a large number of light receiving elements, whereas the PSD 4a is, as is well known, one elongated light receiving element, and has one common terminal (cathode) C and two terminals (polarity different from the common terminal C). Anode) A,
I have B.

In this range finder, when the light source 3a is caused to emit light and the reflected light reflected by the subject is made incident on the PSD 4a, the position of the light striking the light receiving surface varies depending on the distance of the subject O, and the terminals A and B A photocurrent is generated corresponding to the position of the light spot. Therefore, by measuring this photocurrent, the subject distance can be known. The above is the principle of distance measurement of triangulation using the PSD 4a.

By applying an operation signal to the shutter unit 23 based on the distance measurement data, automatic focusing can be performed in the entire zooming range. That is, when a drive pulse based on the distance measurement data is applied to the pulse motor of the shutter unit 23,
The lens feeding lever 23a rotates by an angle corresponding to the pulse to rotate the front lens group frame 24 together. Therefore, the helicoid 25 moves in the optical axis direction so that the front lens group frame 24 (front lens group L1) is at the in-focus position. The present invention can also use an AF device based on a distance measuring principle other than this.

In principle, the distance measurement accuracy based on the trigonometric distance measurement principle depends on the distance between the light emitting section 3 and the light receiving section 4, that is, the base line length L. Therefore, it is preferable to make both distances as large as possible. In the present invention, the base line length is increased, and between the light emitting unit 3 and the light receiving unit 4 which are the result of the increase,
The zoom motor 5 is arranged. The position of the zoom motor 5 is effective for increasing the base length of the distance measuring device and at the same time reducing the size of the entire camera. Zoom motor 5
Is fixed to a motor support plate 6c formed by bending integrally with the base plate 6, and a pinion 7 is fixed to a drive shaft 5a thereof.

As described above, in the lens shutter type camera of the present invention, the cam ring 14 is provided with the zooming cam groove 20f that moves (feeds) the front lens group L1 further forward from the telephoto end. When the distance measuring device including the light emitting unit 3 and the light receiving unit 4 is operated as it is during the macro photography, the reflected light from the subject at the close position does not enter the PSD 4a. That is, since the distance cannot be measured, the drive signal (distance measurement data) cannot be given to the shutter block 23. The present invention has a novel configuration for correctly detecting the subject position even during this macro photography. The distance measuring device at the time of this macro photography will be described with reference to FIGS.

A short-distance correction optical element 4e consisting of a prism 4c having two total reflection surfaces and a mask 4d advances to the front surface of the light receiving portion 4 of the distance measuring device only during macro photography. The prism 4c has an effect of optically extending the base length of the distance measuring device and an effect of refracting the light beam. Mask 4d
Is for blocking light other than the necessary optical path, and has an opening 4f on the object side and an opening 4g on the light receiving lens 4b side. The opening 4f is formed in a slit shape so as to be separated from the optical axis of the light receiving lens 4b by a distance s on the side away from the optical axis of the light projecting lens 3b, and the opening 4g is formed in the light receiving lens 4b.
The slit is opened corresponding to the position of the optical axis of.

According to this configuration, when the close-up photographing is performed, FIG.
As shown in FIG. 3, the optical axis of the light receiving lens 4b of the distance measuring device is translated in the direction of the base line length L by s by the effect of the prism 4c, and the light receiving lens 4b is moved at a finite distance.
And the optical axis of the projection lens 3b can intersect.

There is known a technique of disposing a prism having only the effect of refracting the distance measuring light on the front surface of the distance measuring optical system in order to perform the short distance correction in the conventional distance measuring device of this type. However, this conventional technique has a problem that the amount of deviation of the spot image on the PSD 4a with respect to the change in the object distance during close-up photography is insufficient and accurate focus correction cannot be performed. On the other hand, as described above, according to this short distance correction device that not only refracts the distance measuring light beam but also translates it by s in the direction of the base line length L, the base line length is L + s and the PSD 4a on the subject distance By increasing the shift amount of the spot image and appropriately setting the angle δ1, the refractive index and the like of the prism 4c, the correct subject distance can be detected. Therefore, if the shutter block 23 is driven on the basis of this distance measurement data, it is possible to obtain a photograph with a correct focus even in macro photography.

As shown in FIGS. 1 to 4, the short distance correction optical element 4e has a shaft 41 located below the light receiving portion 4.
It is fixed to one end of an arm 42 pivotally attached to the base plate 6, and an interlocking protrusion 43 is integrally provided at the other end of the arm 42. The arm 42 maintains linearity when no external force is applied, but has flexibility such that it is elastically deformed when an external force is applied. Further, the short-distance correction optical element 4e is normally urged by the tension spring 46 to rotate in the direction of retracting from the front of the light receiving unit 4. Then, the cam ring 14 engages with the interlocking protrusion 43 when the cam ring 14 is rotated to the macro photographing position, and the short distance correction optical element 4e.
An advancing protrusion 44 for advancing the light to the front surface of the light receiving portion 4 is provided. The position and shape of the advancing protrusion 44 are set so as to rotate the optical element 4e more than the front surface of the light receiving unit 4, but the rotating end of the advancing protrusion 44 of the short-distance correction optical element 4e is the base plate 6. The side surface of the gear support plate 6e that is integral with is regulated, and the amount of overcharge by the advancing protrusion 44 is absorbed by the flexibility of the arm 42.

According to the above structure, when the cam ring 14 is rotated to the macro photographing position, the short distance correction optical element 4e can be automatically positioned on the front surface of the light receiving section 4. A drive signal from the distance measuring device having the light emitting section 3 and the light receiving section 4 to the shutter block 23 is sent via a flexible printed circuit board (FPC board) not shown. This flexible printed circuit board is bent and arranged inside the cam ring 14 so that it can be extended and folded with a margin in the entire movement range of the front lens group L1 and the rear lens group L2.

Next, returning to FIG. 1 again, the finder block 2 will be described. The finder block 2 includes a finder device 8 and a strobe device 9. Both the finder device 8 and the strobe device 9 change the finder field and change the irradiation angle (light intensity) of the strobe in conjunction with the change in the focal length of the lens barrel block 1. The zoom motor 5 is used as a power source therefor. A pinion 50 different from the pinion 7 is meshed with the gear 15 of the cam ring 14, a shaft 51 of the pinion 50 is extended to the rear of the base plate 6, and a reduction gear train 52 is provided at the rear end thereof. There is. Reduction gear train 52
The final gear 52a of the gear meshes with the rack 53a of the cam plate 53. The cam plate 53 is slidable in the left-right direction, and the rack 53a is attached to the tip (lower end) of the lower bent portion 53b at the rear end.
Are provided integrally. The reduction gear train 52 includes the gear 15
Rotation is reduced to reduce the movement of the cam ring 14 and to give it to the cam plate 53. The cam plate 53 has a variable magnification cam groove 55 for the finder device 8, a parallax correction cam groove 56, and a strobe cam groove 57 for the strobe device 9.
Is provided.

The lens system of the finder device 8 is basically a fixed subject side lens unit L3 and an eyepiece lens unit L.
4 and a movable variable magnification lens unit L5,
A deflection prism P1 for macro photography is provided. The variable-magnification lens unit L5 is for matching the photographing screen by the variable-magnification operation of the lens barrel block 1 with the field of view by the finder device 8. The declination prism P1 advances to the optical axis only during macro photographing, and particularly parallax. To correct. That is, in the lens shutter type camera, parallax is unavoidable, and the amount of parallax becomes larger in short-distance shooting, but the camera of the present invention is capable of macro shooting, and since the parallax amount becomes large at this time, macro shooting Only in some cases, a wedge-shaped deflection prism P1 having a thick lower portion and a thin upper portion is inserted into the optical path to bend the optical path downward so that a portion closer to the photographing portion can be observed. FIG. 22 shows an outline of the optical path when the deflection angle prism P1 is inserted.

The strobe device 9 narrows the irradiation angle when the focal length of the photographing lens is a long focal point, that is, as the lens is extended, while it widens the irradiation angle to reduce the amount of light to the subject during macro photographing. Is. Therefore, in this embodiment, the Fresnel lens L6 is fixed and the xenon lamp 5
The reflecting shade 59 holding 8 is moved in the optical axis direction.

Then, a concrete structure example for giving the above-mentioned movements to the finder device 8 and the strobe device 9 will be described with reference to FIGS. 15 to 24. On the finder block 54 fixed to the base plate 6, the finder base plate 6
0 is fixed, and the cam plate 53 is attached to the finder base plate 60.
A guide pin 62 fitted into the straight guide groove 61 of is fixed. The cam plate 53 has a straight guide groove 61 and a guide pin 62, and a holding guide 60a formed as a cut-and-raised piece in the finder base plate 60 for suppressing the front lifting of the cam plate 53, so that the sliding direction is left and right. Direction is restricted (Figs. 15 and 16).

The viewfinder parent plate 60 is provided with a variable power lens guide groove 63, a declination prism guide groove 64, and a strobe guide groove 65 in the front-rear direction, and the variable power lens guide groove 63 has a variable power lens guide groove 63. The guide projection 66a of the variable power lens frame 66 supporting the group L5 is fitted, the guide projection 67a of the deviation prism working plate 67 is fitted in the declination prism guide groove 64, and the reflection shade is fitted in the strobe guide groove 65. 5
The guide projection 68a of the strobe case 68 to which 9 is fixed is fitted to regulate the movement direction of these elements in the front-back direction. Then, the driven pins 69, 70, 71 are planted in the guide protrusions 66a, 67a, 68a, respectively, and these driven pins are respectively arranged in the variable magnification cam groove 5 described above.
5, the parallax correction cam groove 56, and the strobe cam groove 57. Therefore, when the cam plate 53 moves to the left and right, the variable power lens frame 66 and the deflection angle prism operating plate 6 are moved.
7, the strobe case 68 has these cam grooves 55, 5
According to the shapes of 6 and 57, it will move back and forth respectively.

The sections of the variable magnification cam groove 55, the parallax correction cam groove 56, and the strobe cam groove 57 correspond to the sections described for the zooming cam grooves 20 and 21 of the cam ring 14 in FIG. That is, the variable magnification cam groove 55 is
It has a wide-angle end fixed section 55a, a variable magnification section 55b, and a telephoto end fixed section groove 55c, and the angles θ1, θ2, and θ3 of these sections have a corresponding relationship with FIG. On the other hand, the parallax correction cam groove 56 has a non-projection section 56a, a projection movement section (macro feeding section), a projection movement section 56b, and a projection position fixing section (macro end fixing section) 56c.
The strobe cam groove 57 has a wide-angle end fixed section 57a, a variable magnification section 57b, a telephoto end fixed section 57c, and a macro feeding section 57.
d and a macro end fixed section 57e. These cam grooves 55, 56, 57 and the zooming cam groove 2
The relationship between 0 and 21 is shown in FIG.

The variable power lens frame 66 supporting the variable power lens group L5 is, as shown in FIG.
It is movably supported in a suspended manner on the guide surface 54a. When this moves along the zooming cam groove 55, the magnification of the finder optical system including the subject side lens group L3, the eyepiece lens group L4, and the zooming lens group L5 changes, and the shooting range by the lens barrel block 1 and the viewfinder field of view. And are almost the same. Such an optical system can be obtained by a simple lens design technique.

Next, the deflection angle prism operating plate 67 will be described mainly with reference to FIGS. First, the deflection prism P1 made of synthetic resin has fulcrum pins 7 at the lower ends on both sides thereof.
4 is rotatably supported by the finder block 54. A biasing torsion spring 75 is wound around the fulcrum pin 74, and one end of this torsion spring 75 is hooked on a position regulating piece 76 fixed to the side surface of the deviation prism P1 to keep the deviation prism P1 constantly. Is the lens group L on the subject side
The third to the variable power lens unit L5 are urged to be positioned in the optical path. The position control piece 76 is provided in the finder block 54.
It is located in the arc-shaped escape groove 79 formed in the above. The deviation prism operating plate 67 is sandwiched between the finder block 54 and the guide plate 80 fixed to the finder block 54,
A guide pin 81 planted on the side surface is fitted in a straight guide groove 82 formed in the finder block 54.

The position regulating piece 76 is a deflection prism operating plate 67.
The rotation blocking surface 77 and the rotation surface 78 can be engaged with each other.
When the driven pin 70 is in the non-projecting section 56a of the parallax correcting cam groove 56,
The rotation preventing surface 77 is brought into contact with the position restricting piece 76 to withdraw the deviation prism P1 from the optical path against the force of the torsion spring 75, but the driven pin 70 projects the protruding motion section 56b.
Then, the rotating surface 78 is made to correspond to the position regulating piece 76.
Then, the force of the torsion spring 75 causes the deflection angle prism P1 to rotate in the optical path, and the position restricting piece 76 thereof causes the rotation surface 7 to rotate.
As shown in FIGS. 21 and 22, it gradually projects into the optical path while abutting on 8, and bends the finder optical path as shown in FIG. In other words, reduce parallax during macro shooting.

As shown in FIG. 24, a guide block 85 is provided on the side surface of the strobe case 68. The guide block 85 is fitted in a straight forward guide groove 84 formed in the guide plate 80 in the front-rear direction. The height adjustment pins 86 (see FIGS. 17 and 2) are provided above and below the strobe case 68 to prevent the strobe case 68 from falling.
3) is fixed. Therefore, this strobe case 68 has a strobe cam groove 57 when the cam plate 53 moves left and right.
Go back and forth according to the shape of. The variable magnification section 57b of the strobe cam groove 57 is a section in which the xenon lamp 58 is retracted with respect to the Fresnel lens L6, and the irradiation angle range emitted from the Fresnel lens L6 is narrowed in accordance with the receding, and the focal length is increased. No guide number acts to substantially increase the number. On the other hand, in the macro feeding section 57d, the irradiation angle is widened conversely to substantially reduce the guide number in macro photography.

The mechanical structure of the lens shutter type camera of the present invention has been described above. Next, the control system will be described. In this camera, a change in the focal length of the zoom lens of the lens barrel block 1, a change in the open F value associated with the change in the focal length, that the lens is at the wide-angle end, and a telephoto (telephoto) ) Information such as being at the edge, being in the storage position, being in the macro photographing position, etc. is automatically detected, and various controls are performed by this.
To detect the lens position, a code plate 90 is fixed to the outer periphery of the cam ring 14 of the lens barrel block 1 as conceptually shown in FIG.
The base end of a brush 92 that is in sliding contact with the code plate 90 is fixed to the first position. FIG. 25 is a development view of the code plate 90. Above the drawing, the zooming cam groove 2 of the cam ring 14 is shown.
0, 21, and cam grooves 55, 56, 5 of the cam plate 53
Seven cam profiles are also drawn. Brush 9
2 is a terminal with common terminal C and reference numerals 0, 1, 2, 3
It has T0, T1, T2 and T3, and when these terminals T0 to T3 are in contact with the conductive land 93 of the code plate 90, a signal of "φ" is taken out, and when they are not in contact, a signal of "1" is taken out. The cam ring 1 is combined with the combination of these "1" and "φ" signals.
The rotation position of 4 is detected. Reference numeral 94 is a dummy terminal provided between the conductive lands 93.

The above 4-bit information of T0, T1, T2 and T3 is given as zoom code data ZP0, ZP1, ZP2 and ZP3 of the zoom code encoder. FIG. 26 shows "1" and "φ" of these zoom code data.
In this example, the rotational position (POS) of the cam ring 14 is from "φ" to "9" and "A",
1 of "B" and "C" (hexadecimal number)
The detection is performed in three stages. “0” is a lock position, “C” is a macro position, and there are different focal length positions fo to f7 ′ in the middle. This turning position
(POS) is also drawn below the code plate in FIG.

On the other hand, the rotation control of the cam ring 14 is performed by the mode switch 101 and the zoom switch 102. 27 to 29 show specific examples of the arrangement of the switches 101 and 102 with respect to the camera body. Reference numeral 99 is a release button, which is turned on to turn on the photometric switch 103 (FIG. 32), and is pressed on to turn on the release switch 123 (same).

The mode selector switch 101 is locked (LOC
K), zoom (ZOOM), and macro (MACRO) three-position transfer switch, as shown in FIGS. 29 to 31, as shown in FIG.
When is not pressed, the switch lever 101b can move between the ROCK position and the ZOOM position and the macro button 101
When the switch lever 101b is slid onto the macro button 101a while pressing a, the MACRO position is reached.
And in the LOCK position, I can't release and the zoom doesn't work either. With the ZOOM position, release and zoom operations are possible, and with the MACRO position, release is possible but zoom operation is not possible.

Further, the zoom switch 102 is in a neutral (OFF) position in a state where the hand is released, and by applying an operating force in different directions, it is switched to a wide angle (WIDE) and a telephoto (TELE).
By switching this switch, the zoom motor 5 rotates forward and backward.

The mode switch 101 and the zoom switch 102 basically operate the camera of the present invention as follows. 1. When the mode selector switch 101 is in the LOCK position, the zoom motor 5 rotates in the reverse direction, and the cord plate 90 and the brush 92
The rotational position of the cam ring 14 detected by
When the "POS" becomes "φ" (FIG. 25, FIG. 26, the same applies hereinafter), the zoom motor 5 stops. 2. When the mode switch 101 is in the MACRO position, the zoom motor 5 rotates forward, and when POS becomes “C”, the zoom motor 5 stops. 3. When the mode switch 101 is in the ZOOM position When the zoom switch 102 is WIDE, the zoom motor 5 rotates in the reverse direction, and when it is in the TELE mode, it rotates normally. Then, in the case of TELE, the zoom motor 5 stops when POS becomes “A”. In the case of WIDE, after POS becomes "1", the zoom motor 5 continues reverse rotation for a short time, then it rotates forward and stops when POS becomes "2".

When the zoom switch 102 is turned off (positioned at the neutral position) while the zoom motor 5 is rotating, when the zoom motor 5 is in the TELE direction (normal rotation), it immediately stops.
In the WIDE direction (reverse rotation), the motor is normally rotated for a certain short time, and then stopped. This short-time forward rotation eliminates the backlash of the mechanical system in the lens barrel block 1 and the finder block 2 and eliminates the change in the stop position when stopped in the WIDE direction and when stopped in the TELE direction. is there.

The entire control system of the camera of the present invention including the above control will be described in more detail with reference to FIGS. First, in FIG. 32, a zoom motor control unit (hereinafter referred to as ZM / C) 100 is composed of, for example, a one-chip microcomputer, and its internal program memory (ROM) stores a program to be described later.

The ZM / C 100 receives the respective switch data from the above-mentioned mode changeover switch 101, zoom switch 102, photometric switch 103, and zoom encoder (shown as a switch equivalent circuit in the figure) 104. From a main control unit (hereinafter referred to as MC / U) 109 described later, a zoom motor operation prohibition signal DIS and a clock C for serial data transfer
LK and the serial signal SI carrying the switch check / operation end data described later are input. Also this Z
A rotation control command RCM is output from the M / C 100 to a zoom motor drive circuit 107 that controls the zoom motor 5, and a power hold signal PH for turning on / off the power to the MC / U 109 and a zoom from the zoom encoder 104 are output. A serial signal SO carrying the code data ZP0 to ZP3 is output.

The mode changeover switch 101 produces two signals of LOCK and MACRO shown in the following Table 1 according to the above-mentioned three positions of lock (LOCK), zoom (ZOOM) and macro (MACRO).

[0045]

The zoom switch 102 is set to the WI as described above.
Takes three positions: DE momentary, OFF, and TELE momentary.

The photometric switch 103 is provided with a release button 9
It operates by pushing one step of 9 (actuation signal SWS), and the distance measuring device 121 (the above-mentioned one provided with the light emitting part 3 and the light receiving part 4).
And the photometric device (A / E) 120 is operated. The zoom encoder 104 detects the rotational position of the cam ring 14 as the zoom code of ZP0 to ZP3 by the code plate 90 and the brush 92 described above, converts this to the value POS, and Z
Give to M / C100.

In the switch scan control process performed via the terminal SSC, the voltage "H" is applied only when the input of each switch is checked, and otherwise the voltage is "L" to reduce the current consumption.

The regulator 105 is supplied with power from the battery 106 and supplies a required drive voltage to the ZM / C 100.

The zoom motor drive circuit 107 is configured as shown in FIG. 33, for example, and the 4-bit rotation control command RCM (FOWN, FOWP, REV from the ZM / C 100 is used.
Based on N, REVP), rotation and stop of the zoom motor 5 are controlled as shown in Tables 2 and 3.

Table 2 Forward rotation FOWN FOWP REVP REVN 1 Open 2 ON ON Forward rotation 3 Open 4 ON ON Brake 5 Open

Table 3 Reverse rotation FOWN FOWP REVP REVN 1 Open 2 ON ON Reverse rotation 3 Open 4 ON ON Brake 5 Open

The MC / U 109 is also composed of, for example, a one-chip microcomputer, and has the following functions by executing the program stored in its internal program memory (ROM).

(1) Function of controlling the rotation of the hoisting motor 111 via the hoisting drive circuit 110. (2) The shutter block 2 described above via the driver 112.
(3) Function to control various indicators 115 via driver 114 (4) Function to control strobe unit 117 (strobe circuit including xenon arc tube 58) via interface 116 (5) Function to output zoom motor operation prohibition signal DIS to ZM / C100 via interface 118 (6) Function to output serial transfer clock CLK via interface 118 (7) Switch check / to be described later via interface 118 Function to output serial signal SI with operation end data (8) Function to continue operation of regulator 124

The MC / U 109 has switch data from the winding motor control switch 119 such as a film rewinding switch and a back cover switch, photometric data from the photometric device 121, and a distance measuring device in order to fulfill the above-mentioned functions. Distance detection data from 120, film sensitivity setting or automatic reader
The film sensitivity data from the (ISO) 122 and the switch data SWR from the release switch 123 are input.

The regulator 124 is the MC / U10.
The operation is continued by 9 and the interface 11
8 is started / stopped depending on the presence / absence of the power hold signal PH input via 8, and the start is also activated by the switch data from the hoisting motor control switch 119. During operation, the main control system other than the zoom control system is activated. Supply the required power to each part.

Next, Z shown in each of FIGS. 34 to 39 is shown.
The operation of the ZM / C 100 will be described with reference to the flow chart of the program stored in the ROM of the M / C 100.

First, referring to FIGS. 34 and 35, ZM /
When the battery 106 is housed in the battery case and the power is supplied from the regulator 105, the CPU of the C100 performs S
At 1, initialization processing is performed.

Next, in S2, the switch scan control process described above is performed to make the mode changeover switch 10
1, after inputting each switch state of the zoom switch 102, the photometric switch 103, and the zoom encoder 104, the photometric switch 10 is input in S3 based on the input data.
Check if 3 is off.

If the photometric switch 103 is on, the steps S2 and S3 are repeated to repeat the photometric switch 1
03 is turned off, and if the photometric switch 103 is off, the process proceeds to S4.

At S4, it is checked whether or not the zoom motor operation inhibition signal DIS from the MC / U 109 is ON (for example, "1"). If ON, the process proceeds to S5, and if OFF (for example, "φ"). If there is, proceed to S8.

This zoom motor operation prohibition signal DIS is
In order to reduce the power consumption of the battery 106, the hoisting motor 111 and the zoom motor 5 are prohibited from rotating at the same time, and the MC / U 109 is operated by the hoisting motor control switch 119 described above to operate the hoisting motor. 1
Only when 11 is operated, the MC / U 109 turns on the zoom motor operation prohibition signal DIS.

When the zoom motor operation prohibition signal DIS is on, the power hold signal PH described above is obtained in S5.
Is turned on (for example, “1”). In S5, the meaning of outputting the power hold signal PH is MC / U10.
9 operates by the hoisting motor control switch 119 to rotate the hoisting motor 111, it does not unconditionally perform it, but gives permission by this power hold signal PH from the ZM / C 100 and then executes it. Therefore, the zoom motor 5 and the hoisting motor 111 are prevented from rotating at the same time.

Then, in the next step S6, the zoom motor operation inhibition signal DIS from the MC / U 109 is turned off, that is, M
Wait until the rotation control of the hoisting motor 111 by the C / U 109 is completed. When the zoom motor operation prohibition signal DIS turns off, the power hold signal PH is turned off (for example, “0”) in S7 and the regulator 124 is turned off. After that, the process returns to S2.

Even if the regulator 124 is turned off, not all power supply is stopped.
The power supply to 5 shall be continued.

When the zoom motor operation inhibition signal DIS is off, the state of each switch is input in S8 by the same processing as S2, and the zoom encoder 10 is operated in the next S9.
POS conversion is performed to determine which value of the POS (see FIG. 25 and FIG. 26) the zoom codes ZP0 to ZP3 from 4 correspond to.

After this POS conversion, in S10, it is determined whether the switching position (mode) by the mode switching switch 101 is "LOCK", "ZOOM", or "MACRO" based on the data input in S8. If "LOCK", S11
If "ZOOM", the process proceeds to S14, and if "MACRO", the process proceeds to S16.

In the case of "LOCK", in S11,
In S9, it is checked whether the result of POS conversion is POS = φ, that is, whether it is the LOCK position. If POS = φ, the process returns to S2. If POS ≠ φ, the process proceeds to S12 and the zoom motor 5
Is reversed (refer to the rotation control command RCM in Table 3), a mode subroutine described later is executed in S13, and then the process returns to S2.

In the case of "ZOOM", first in S14, it is checked whether or not the result of POS conversion in S9 satisfies POS≤1, and if POS≤1, the process proceeds to S17, and the zoom motor 5 is moved. In addition to the normal rotation (see the rotation control command RCM in Table 2), the mode subroutine described later is executed in S13, and then the process returns to S2.

If POS ≧ 2, in S15, in S9
It is checked whether or not the result of POS conversion satisfies POS ≧ B. If POS ≧ B, the zoom motor 5 is reversely rotated in S12, a mode subroutine described later is executed in S13, and the process returns to S2.

If POS ≦ A, then 2 ≦ POS ≦ A, and the process proceeds to S18.

In the case of "MACRO", in S16, it is checked whether or not the result of POS conversion in S9 is POS = C, that is, MACRO position, and if POS = C, jump to S22 and POS
If ≠ C, the zoom motor 5 is rotated in the normal direction in S17, and the subroutine described later is called in S13, and then the process returns to S2.

Next, in S18, it is checked whether or not the zoom switch 102 is switched to the TELE side (TELE ON) based on the data input in S8. If TELE is ON, S is checked.
After calling a TELE subroutine described later at 19, the process returns to S2, and if TELE is off, the process proceeds to S20.

In S20, it is checked whether or not the zoom switch 102 is switched to the WIDE side (WIDE ON) based on the data input in S8. If WIDE is ON, S2 is selected.
After executing the WIDE subroutine called in 1 below,
Returning to S2, if WIDE is off, the process proceeds to S22.

Then, in S22, it is checked whether or not the photometric switch 103 is turned on based on the data input in S8. If it is not turned on, the process returns to S4, and if it is turned on, the process proceeds to S23.

Each process up to S22 is a process related to the gist of the present invention. Hereinafter, before the description of each process after S23, the mode subroutine of S13, the TELE subroutine of S19, and the WIDE subroutine of S21 will be described. Including,
The operation of the camera according to the present invention will be described.

First, referring to the flow charts of the mode subroutines of FIGS. 36 and 37, when this mode subroutine is called, the CPU of the ZM / C 100 causes the wide end flag (the wide end is referred to in FIGS. 25 and 26) at S130. Of P
OS = 2; fo) Fwide is reset to "φ" and the next S
At 131 and S132, the same processing as S8 and S9 of FIG. 34 is performed.

Next, in S133, based on the data input in S131, whether the switching position (mode) by the mode switching switch 101 is "LOCK" or "ZOOM",
Determine if it is "MACRO", and if "LOCK", go to S134,
If "MACRO", go to S138, if "ZOOM", go to S142,
Each process proceeds.

First, in the case of "LOCK", it is checked whether or not the result of POS conversion in S134 is POS = φ, that is, LOCK position, and if POS = φ, the zoom motor 5 is stopped in S135 (in this case, Since it is in the reverse rotation state, after the rotation control command RCM in Table 3), S2 in FIG.
Return to.

If POS ≠ φ, in S136, it is confirmed whether or not the zoom motor 5 is rotating in reverse. If it is rotating in reverse, the flow immediately returns to S131. If not rotating, the zoom motor 5 is rotated in reverse in S137. After that, the process returns to S131.

Next, in the case of "MACRO", in S138, the result of POS conversion in S132 is POS = C, that is,
Check whether it is in the MACRO position, S1 if POS = C
At 39, the zoom motor 5 is stopped (in this case, it is in the normal rotation state, so refer to the rotation control command RCM in Table 2).
It returns to S2 of FIG.

If POS ≠ C, the zoom motor 5 is moved to S140.
It is confirmed whether or not is rotating normally. If it is rotating normally, the process immediately returns to S131, and if not rotating normally, the zoom motor 5 is rotated in the reverse direction at S141, and then the process returns to S131.

In the case of "ZOOM", in S142, S
Whether the result of POS conversion in 132 is POS ≧ A or POS ≦
Check if 1 or 2 ≦ POS ≦ 9. If POS ≦ 1, go to S143. If 2 ≦ POS ≦ 9, go to S153. POS ≧ A
If so, the process proceeds to S157.

If POS ≦ 1, the zoom motor 5 is moved to S143.
It is checked whether or not is rotating normally. If it is rotating in the normal direction, the process jumps to S146, and if it is rotating in the reverse direction, the process proceeds to S144.

In S144, a standby process is performed in which the process is not advanced for a predetermined time tmsec for the reason described below,
After tmsec has passed, the zoom motor 5 is reversed from reverse rotation to normal rotation in S145.

Next, in S146 and 147, as shown in FIG.
The same processing as S8 and S9 of step
In step S149, the switching position (mode) of the mode changeover switch 101 is based on the data input in step S146. It is checked whether or not "ZOOM" is switched to "LOCK" or "MACRO". If it is switched to "LOCK", the process returns to S134, and if it is switched to "MACRO", the process returns to S138 and "ZOOM". “”, The process proceeds to S150.

In S150, it is checked whether the result of POS conversion in S147 is POS = 2. If POS ≠ 2, S is checked.
Returning to 146, if POS = 2, the process proceeds to S151.

In S151, POS = 2, that is, the wide end is reached, so the wide end flag Fwide is set to "1", and the zoom motor 5 is stopped in the next S152.
It returns to S2 of FIG.

If 2 ≦ POS ≦ 9 is checked in the check in S142, it is checked in S153 whether or not the zoom motor 5 is rotating normally. If it is rotating in the normal direction, the process jumps to S156. After stopping the zoom motor 5, the process returns to S2 in FIG.

When the zoom motor 5 is rotating in the reverse direction, the process proceeds to S154 to rotate the zoom motor 5 in the normal direction first, and then in S155, the process cannot proceed for a predetermined time tmsec due to a reason described later. Perform processing.

After tmsec has elapsed, the zoom motor 5 is stopped in S156, and then S in FIG.
Return to 2.

If POS ≧ A is checked in the check in S142, it is checked in S157 whether the zoom motor 5 is rotating in the reverse direction.
When it is in the normal rotation, the zoom motor 5 is rotated in the reverse direction in S157, and the process proceeds to S159.

In S159 and S160, the same processing as in S8 and S9 of FIG. 34 is performed, and thereafter, S161 and S9.
At 162, the same processing as S148 and S149 described above is performed.

If the switching position (mode) of the mode switching switch 101 remains "ZOOM", S163.
At, it is checked whether or not the zoom motor 5 is rotating in the reverse direction. If it is rotating in the reverse direction, the process proceeds to S164, and if it is rotating in the normal direction, the process proceeds to S167.

In the process of S164, it is checked whether or not the result of POS conversion in S160 is POS = 9. If POS ≠ 9, the process returns to S159. If POS = 9, S165 and S166 are the same as S144 and S145 described above. After performing the processing in step S159, the process returns to step S159.

In the processing of S167, again in S160.
The result of POS conversion is POS = A, that is, the tele end (see FIG. 26).
F7 '), and if POS ≠ A, the process returns to S159, and if POS = A, the zoom motor 5 is stopped in S168, and then the process returns to S2 in FIG.

Next, referring to the flow chart of the TELE subroutine of FIG. 38, when this TELE subroutine is called, Z
The CPU of the M / C 100 resets the wide end flag Fwide described above to "φ" in S190.

Next, in S191, it is checked whether or not the POS conversion result in S9 of FIG. 34 is POS = A.
Immediately returning to S2, if POS ≠ A, that is, if 2 ≦ POS ≦ 9 in this case, the process proceeds to S192 to rotate the zoom motor 5 forward.

Then, in S193 and S194, S in FIG.
8. After performing the same processing as S8, S1 in S195
It is checked whether the POS conversion result of 94 is POS = A, that is, the tele end, and if POS = A, the process jumps to S197 to stop the zoom motor 5 and then returns to S2 of FIG.

If POS ≠ A, S1 in S196
Based on the data input at 93, the zoom switch 10
It is checked whether 2 is still switched to the TELE side (TELE ON). If TELE is ON, the process returns to S193. If TELE is OFF, the zoom motor 5 is stopped in S197 described above.
It returns to S2 of FIG.

Next, referring to the flow chart of the WIDE subroutine in FIG. 39, when this WIDE subroutine is called, Z
First, in S210, the CPU of the M / C 100 checks whether the wide end flag Fwide described above is Fwide = 1, that is, whether the zoom motor 5 is already stopped at the wide end.
If Fwide = 1, the process immediately returns to S2 in FIG. 34, and Fwide
If ≠ 1, the process proceeds to S211.

In S211, a process of rotating the zoom motor 5 in the reverse direction is performed, and thereafter, a standby process in which the process is not advanced for a predetermined time tmsec for the reason described later is executed.

After tmsec has elapsed, the same processing as S8 and S9 in FIG. 34 is performed in 213 and S214, and then S2.
In step 15, it is checked whether or not the POS conversion result of S214 is POS = 1. If POS = 1, the process proceeds to step S216 and POS ≠ 1.
If so, the process proceeds to S223.

In S216 and S217, the process shown in FIG.
Perform the same processing as S144 and S145 of
In 218 and S219, the same processing as S8 and S9 in FIG. 34 described above is performed.

Then, in S220, it is checked whether or not the POS conversion result in S219 is POS = 2. If POS ≠ 2, S21
Returning to step 8, if POS = 2, the processing of setting the wide end flag Fwide to "1" and the processing of stopping the zoom motor 5 are performed in S221 and S222, and then S in FIG.
Return to 2.

If POS ≠ 1 is checked in the check of S215, the process proceeds to S223 to check whether the zoom switch 102 is still switched to the WIDE side (WIDE ON), and if WIDE is ON, S213 If WIDE is off, the process proceeds to S224.

Then, in S224, S225, and S226, the same processing as S154, S155, and S156 in FIG. 37 described above is performed, and thereafter, the process returns to S2 in FIG.

Next, S1 to S22 of FIG. 34 and FIG.
39 to 39, the operation of each processing in FIG.

(1) When the battery 106 is housed in the battery case and the hoisting motor control switch 119, the release button 99, and the zoom switch 102 are not operated at all

(A) When the mode changeover switch 101 is in the LOCK position, the CPU of the ZM / C100 operates as shown in FIG.
After the initial setting process of S1 is performed, S2 to S are provided on condition that the rotational position of the cam ring 14 that controls the movements of the front lens group L1 and the rear lens group L2 is POS = φ.
Only the respective processes are repeated in the first loop of S4, S8 to S11, and S2, and no camera operation is performed. At this time, if the release button 99 is pressed midway and the photometric switch 103 is turned on, S is pressed until it is turned off.
The process of 2 and S3 is repeatedly executed, and the release button 9
Action 9 is ignored. The rotation position of the cam ring 14 is P
If OS ≠ φ, the zoom motor 5 is reversed in the direction of POS = φ by the process of S12 of FIG. 34, and S131 to S134, S136, and S131 of FIG.
The rotation of the zoom motor 5 is controlled so that the rotational position of the cam ring 14 stops at POS = φ by the repeating processing of step S135 and the processing of S135, and when POS = φ, the process returns to the first loop described above.

(B) When the mode selector switch 101 is switched from the LOCK position to the ZOOM position, the CP of the ZM / C100
U exits the first loop described above and proceeds to S14. At this time, since POS = φ, the zoom motor 5 is normally rotated by the process of S17, and
S130-S133, S142, S143, S
146 and S147, the process proceeds to S150 and S1 on condition that the mode switch 101 is not switched to the LOCK position or the MACRO position in S148 and S149.
Wait until POS = 2 in the loop from 46 to S149, then POS
When = 2, the zoom motor 5 is stopped in S152 via S151, and then the process returns to S2 in FIG. That is, in this case, the rotation stop position of the cam ring 14 is as shown in FIG.
It becomes the wide end (POS = 2) where the focal length shown in is fo. Note that the CPU of the ZM / C100 returns to S2, and then performs S4 and S8 on condition that no camera operation is performed.
~ S10, S14, S15, S18, S20, S22,
Each process is repeated in the second loop of S4.

(C) When the mode selector switch 101 is switched from the ZOOM position to the MACRO position while the cam ring 14 is stopped at the wide end, the CP of the ZM / C100 is changed.
U escapes from S10 from the second loop described above, and
Proceed to 16. At this time, since POS = 2, the zoom motor 5 is rotated in the normal direction by the process of S17, and the rotational position of the cam ring 14 is changed to POS by the process of repeating S131 to S133, S138, S140, and S131 of FIG. The rotation of the zoom motor 5 is controlled so as to stop at = C, and when POS = C, the process returns to S2 in FIG. 34, and S4, S8 to S10, S16 are provided provided that no camera operation is performed thereafter. Each processing is repeated in the third loop of S22 and S4.

(D) When the mode selector switch 101 is switched from the MACRO position to the ZOOM position, the C of ZM / C100
The PU exits S10 from the above-mentioned third loop and returns to S
Proceed to 14. At this time, since POS = C, S14 and S1
5, the zoom motor 5 is rotated in the reverse direction by the process of S12, and S131 to S13 of FIGS.
3, the process proceeds to S157, S159, and S160 via S142. Then, on the condition that the mode switch 101 is not switched to the LOCK position or the MACRO position in S161 and S162, S163, S164 and S15.
In the loop from 9 to S163, wait until POS = 9, then P
When OS = 9, a process of waiting tmsec is performed in S165, and then a process of rotating the zoom motor 5 from the reverse rotation to the forward rotation is performed in S166. Here, the processing of S165 and S166 is performed for the following reason. That is, when switching from the MACRO position to the ZOOM position, set the cam ring 14 to POS.
Although it is stopped immediately after entering POS = A from the = 9 side, if the zoom motor 5 is reversed from reverse rotation to normal rotation and stopped at POS = A immediately after POS = A changes to POS = 9, the zoom motor will stop. There is a possibility that the zoom motor 5 may stop without removing the backlash of the gears of the drive transmission system in FIG. However, when POS = 9, by further rotating the zoom motor 5 in reverse for tmsec, the time until it returns to POS = A is gained, and if the zoom motor 5 is then rotated in the normal direction, the forward rotation side backlash will occur. It can be stopped at POS = A with the removed.
After the processing of S166, S159 to S163, S1
67, wait until POS = A in the loop of S159, POS =
When it becomes A, the zoom motor 5 is stopped in S168 and the process returns to S2 in FIG. That is, in this case, at the rotation stop position of the cam ring 14, the focal length shown in FIG. 26 is f7 '.
Tele end (POS = A). Also in this case, ZM /
After returning to S2, the CPU of the C100 returns to S2 on the condition that no camera operation is performed, as in (b) above.
Each process is repeated in the second loop described above. Also this MACR
By switching from the O position to the ZOOM position, S142 to S15
When proceeding to 7, in addition to the above case, S131 to S13
This can also occur when the mode switch 101 is switched to the ZOOM position when the cam ring 14 is in the position corresponding to POS ≧ A during the loop processing of S3, S138, S140, S141, and S131. However, in this case, S158
The zoom motor 5 which is normally rotating is reversely rotated by the processing of.

(E) When the mode selector switch 101 is switched from the ZOOM position to the MACRO position with the cam ring 14 stopped at the tele end (POS = A), the starting point is POS = A instead of POS = 2. Same as (c) above, except that

(F) By checking S148, S149, S161, and S162 of FIG. 37 in the description of (b) to (d) above, the mode changeover switch 101 moves from the ZOOM position to the LO position.
When it is checked that the cam ring 14 has been switched to the CK position or the MACRO position, in the case of the LOCK position, the cam ring 14 is set to POS = φ by the loop processing of S134, S137, S131 to S134 described above and the processing of S135.
In case of MACRO, the operation is stopped at S138, and S140, S141, S131 to S133, and S138 described above are also executed.
Of the cam ring 1 by the loop processing of S139 and the processing of S139.
4 stops at POS = C.

(G) S131 to S1 in FIGS. 36 and 37
33, S138, S140, S141, S131, and when the cam ring 14 is in the position corresponding to 2 ≦ POS ≦ 9, or S131 to S1 in FIG.
37, during the loop processing of S131, and the cam ring 14
Is in the position corresponding to 2 ≦ POS ≦ 9, when the mode selector switch 101 is switched to the ZOOM position, ZM / C
The CPU 100 exits the loop from S133 and advances the processing to S142. And in this case 2 ≤ POS
Since ≦ 9, the process proceeds to S153, jumps from S153 to S156 when the zoom motor 5 is rotating normally, immediately stops the zoom motor 5, and proceeds from S143 to S154 when the zoom motor 5 rotates in the reverse direction. Then, first, the zoom motor 5 is rotated from the reverse direction to the forward direction, and after waiting for the time tmsec for removing the backlash on the forward direction side, the zoom motor 5 is stopped in S156. That is, when 2 ≦ POS ≦ 9, the rotation stop position of the cam ring 14 is an arbitrary position where the focal length shown in FIG. 26 is any of fo to f7. When the cam ring 14 is in the position corresponding to 2 ≦ POS ≦ 9, the mode selector switch 101 is set to ZO.
In the case of the OM position, in addition to the above, it may be due to the operation specifications of the zoom switch 102 described later.

(H) S131 to S136 and S13 of FIG.
In the loop processing of No. 1, when the mode switch 101 is switched from the LOCK position to the ZOOM position when the cam ring 14 is at the position corresponding to POS = 1, the CPU of the ZM / C100
Advances the processing from S133 to S142, S143, and then to S144. Then, in S144 and the next S145, the same processing as S165 and S166 described above is performed. That is, when switching from the LOCK position to the ZOOM position in this way, the cam ring 14 is stopped immediately after entering POS = 2 from the POS = 1 side, but immediately after changing from POS = 2 to POS = 1. If the rotation is reversed from the reverse rotation to the normal rotation and stopped at POS = 2, the zoom motor 5 may stop without removing the backlash of the gears of the drive transmission system in the zoom motor 5. However, by further rotating the zoom motor 5 in the reverse direction for tmsec, the time required to return to POS = 2 is gained, and then the zoom motor 5 is rotated in the normal direction to eliminate the backlash on the forward rotation side and POS = 2. You can stop.

(2) When the hoist motor control switch 119 is operated while the CPU of the ZM / C 100 is executing the loop processing such as the first loop or the second loop described above.
The CPU of the C / U 109 uses the zoom motor operation prohibition signal DI
Since S is turned on, the CPU of the ZM / C 100 advances the processing from S4 to S5 in FIG. Then, by turning on (outputting) the power hold signal PH in S5, the MC
/ U109 is permitted to rotate the hoisting motor 111, and in response to this, the CPU of the MC / U109 starts rotation control of the hoisting motor 111.

The MC / U 109 is the hoisting motor 111.
When the zoom motor operation prohibition signal DIS is turned off after finishing the control of No. 2, the CPU of the ZM / C 100 advances the processing from S6 to S7, turns off the power hold signal PH, and returns to S2.

From the above-mentioned first and second loop processing, S
By branching from 4 to S7, the operation of the zoom motor 5 is prohibited during the operation of the hoisting motor 111, and the operations of the photometric switch 103 and the release switch 123 are also ignored.

(3) When the zoom switch 102 is operated to the TELE side while the CPU of the ZM / C100 is executing each processing of the above-mentioned second loop, the C of the ZM / C100 is operated.
The PU advances the processing from S18 to S19 in FIG. 34, and executes the TELE subroutine shown in FIG. 38 by calling. First S
After resetting the wide end flag Fwide to “φ” at 190, if the rotation stop position of the cam ring 14 is at the tele end where POS = A, it is not necessary to rotate the zoom motor 5, so immediately return to S2 of FIG. If it is other than the tele end (2≤POS≤9 when this TELE subroutine is called), the zoom motor 5 is normally rotated in S192, and then the zoom switch 102 is looped in S193 to S196 and S193. Is not returned from the TELE side to the neutral position, the cam ring 14 is waited for the turning position to be POS = A. When POS = A, the zoom motor 5 is stopped in S197. Then, it returns to S2 of FIG.

When the zoom switch 102 is operated to the TELE side in this way, if the TELE operation is maintained, the cam ring 14 stops at the tele end. However, when the zoom switch 102 is opened and returned to the neutral position on the way to the tele end, the process proceeds from S196 to S197, and the zoom motor 5 is immediately stopped. That is, the zoom switch 10
By returning 2 to the neutral position from the TELE side at a required timing, the cam ring 14 can be stopped at an arbitrary position (arbitrary focal length) corresponding to 2 ≦ POS ≦ 9.

(4) When the zoom switch 102 is operated to the WIDE side while the ZM / C100 CPU is executing the processes of the second loop described above, the ZM / C100 CPU
Advances the processing from S20 to S21 in FIG. 34 and executes the WIDE subroutine shown in FIG. 39 by calling.

First, at S210, the wide end flag Fwide
Is 1 or not, and if Fwide = 1, the rotation stop position of the cam ring 14 is the wide end of POS = 2, and it is not necessary to rotate the zoom motor 5, so immediately return to S2 in FIG. , Fwide = φ, the zoom motor 5 is reversed in S211.

Then, in S212, a process of waiting for a time tmsec is performed. This is because when the zoom switch 102 is returned to the neutral position immediately after the zoom switch 102 is operated to the WIDE side, the reverse rotation amount of the zoom motor 5 becomes uncertain. This is because the backlash removing operation in S224 and S225 increases due to the reverse operation, and the cam ring may rotate in the TELE direction.

After the processing of S212, S213 to S215,
In the loop of S223 and S213, the zoom switch 102
Wait until the turning position of the cam ring 14 first becomes POS = 1, provided that P is not returned from the WIDE side to the neutral position.
When OS = 1, in S216 and S217, the above-mentioned S
165 and S166 are performed, and S2
The loop processing of 18 to S220 and S218 is performed to remove backlash and wait until POS = 2.

Then, at the wide end with POS = 2,
After the wide end flag Fwide is set to "1" in S221, the rotation of the zoom motor 5 is stopped and the process returns to S2 in FIG.

When the zoom switch 102 is operated to the WIDE side in this way, if the WIDE operation is maintained, the cam ring 14 stops at the wide end.

Of course, when the zoom switch 102 is released and returned to the neutral position on the way to the wide-angle end, S
223 to S224 and S225 described above, S1 in FIG.
54, the zoom motor 5 is stopped in S226 after the backlash removal processing similar to that in S155. That is, by returning the zoom switch 102 from the WIDE side to the neutral position at a required timing, the cam ring 14 is moved to 2 ≦ POS ≦.
It can be stopped at an arbitrary position (arbitrary focal length) corresponding to 9.

Finally, the processing after S22 will be described with reference to FIG. When the CPU of the ZM / C100 is executing each processing of the second loop described above, the release button 99
To turn on the photometric switch 103 (provided that the hoisting motor control switch 119 is not turned on).
Then, the CPU of the ZM / C 100 advances the processing from S22 to S23.

First, in S23, the power hold signal PH
Is turned on to operate the MC / U 109. Then S24
Then, by checking whether the zoom motor operation prohibition signal DIS from the MC / U 109 is turned on,
After confirming whether MC / U109 has operated, if it can be confirmed, in S25, the POS conversion result of S9 is MC / U.
In order to serially transfer to the 109, the POS conversion result (zoom code data) is set in the output register, and the set data is put on the serial signal SO in synchronization with the clock CLK from the MC / U 109, and MC / U
Serial transfer to U109.

Then, in S26, the completion of the transfer process is waited, and when the transfer process is completed, the process proceeds to S27.

At S27, the input of the serial signal SI carrying the switch check / operation end data from the MC / U 109 is waited for. When the serial signal SI is input, the input data is checked at S28.

If the input data is the operation end data (power hold-off request data) END indicating the operation end of the MC / U 109, the photometric switch check data SW is sent to S29.
If it is SCHK, the process proceeds to S31, and if it is the LOCK check data LOCKCHK of the mode switch, the process proceeds to S34.

At S29, since the operation of the MC / U 109 is completed, the power hold signal PH is turned off, and then at S30, it is confirmed that the zoom motor operation prohibition signal DIS from the MC / U 109 is turned off. Since S
Return to 2.

At S31, the power hold signal PH is once turned off to notify the MC / U 109 of whether or not the photometric switch 103 is turned on, and at next S32 the switch data is processed by the same processing as S2. Enter.

Then, in S33, it is checked based on the data input in S32 whether or not the photometric switch 103 is turned on, and if not turned on, it waits for the zoom motor operation prohibition signal DIS to be turned off in S30. S
Return to 2.

That is, when the photometric switch 103 is off, it is effective that the power hold signal PH is turned off in the processing of S31.

If the photometric switch 103 is turned on, it is checked in step S36 based on the input data in step S32 whether or not the mode switch 101 has been switched to the LOCK position, and the switch has been switched to the LOCK position. If so, there is no need to inform that the photometric switch 103 is turned on, and therefore, the process returns to S2 via S30 described above.

If the mode switch 101 has not been switched to the LOCK position, the power hold signal PH is turned on again in S37 and the process returns to S27.

That is, the CPU of the ZM / C100 is the MC
/ U109 asks whether or not the photometric switch 103 is turned on. If the photometric switch 103 is turned on, the fact is notified by turning the power hold signal PH on and off.

Finally, in S34 to S37 and S30, as in the case of the photometric switch 103, it is determined whether the mode selector switch 101 is switched to the LOCK position by the MC / U.
Notify 109.

In the above S23 to S37, ZM /
The zoom code data (POS conversion result) and the ON data of the photometric switch 103 transferred from the C100 to the MC / U 109 are used in the MC / U 109 as follows.

The zoom code data is provided to the shutter speed variable control of the shutter block 23 as data indicating the open F value that changes according to the zoom position, and POS = C indicating the MACRO position is the distance measuring device 120. In the case where the distance measurement data by the camera exceeds the MACRO range, the display in the viewfinder of the display device 115 is turned on to give a warning to the photographer, and at the same time, the operation of the release switch 123 is ignored. .

The ON data of the photometric switch 103 is
It is used for controlling activation of the photometric device 121.

In the above-described embodiment, the example in which the regulator 105 is operated unconditionally when the battery 106 is housed in the battery case has been described. However, for example, the power supply line from the battery 106 to the regulator 105 is manually operated. It is also possible to insert a switch so that the operation of the ZM / C 100 can be started by turning on this manual switch by the photographer.

[0147]

As described above, according to the present invention, the cam ring whose movement in the optical axis direction is restrained is rotatably supported by the fixed portion of the camera body, while the cam ring is rotated on the inner diameter side. Since the constrained variable power lens group is supported so as to be able to move forward and backward, the zoom photographing optical system can be configured with a simple structure. Further, since the foremost variable power lens group projects from the tip of the cam ring to the front of the camera body during zooming, a compact zoom optical system with a large zoom ratio can be obtained during storage. According to claim 2, the electric drive mechanism of the cam ring can be downsized, and the zoom photographing optical system and the zoom finder optical system can be easily synchronized.

[Brief description of drawings]

FIG. 1 is a conceptual perspective view of main elements showing an embodiment of a lens shutter type camera of the present invention.

FIG. 2 is a front view mainly showing the arrangement of a lens barrel block, a light emitting unit and a light receiving unit of a distance measuring device, a short-distance correction optical element, and a zoom motor.

FIG. 3 is a plan view of FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is a vertical cross-sectional view of a lens barrel block.

FIG. 7 is a development view of a front group cam groove and a rear group cam groove of the cam ring.

FIG. 8 is an exploded perspective view of a lens barrel block.

FIG. 9 is a front view of a barrier block in an open state.

FIG. 10 is a front view of the barrier block in a closed state.

FIG. 11 is a conceptual diagram of a distance measuring device based on the triangular distance measuring principle.

12 is a conceptual diagram showing a state in which a short-distance correction optical element is inserted in the distance measuring device of FIG.

13 is an enlarged view of the short-distance correction optical element of FIG.

FIG. 14 is a front view of the same.

FIG. 15 is a plan view of a cam plate portion of the finder block.

16 is a sectional view taken along line XVI-XVI of FIG.

FIG. 17 is a rear view of FIG.

FIG. 18 is a plan view showing a state in which the cam plate is removed in FIG.

19 is a sectional view taken along line XIX-XIX in FIG.

20 is a cross-sectional view taken along the line XX-XX in FIG.

FIG. 21 is a sectional view of an operating state different from that in FIG. 20.

FIG. 22 is a vertical cross-sectional view of the deviation angle prism insertion plate shown in FIG. 21 with the deviation angle prism operation plate removed.

FIG. 23 is a front view similar to FIG. 19 showing a state when the deflection prism is inserted.

24 is a sectional view taken along line XXIV-XXIV in FIG.

FIG. 25 is a development view showing a correspondence relationship between a code plate and a land of the code plate and each cam groove.

FIG. 26 is a table showing a zoom code by the code plate of FIG. 25 and a stop position thereby.

FIG. 27 is a front view showing an arrangement example of each operation switch of the camera of the present invention.

FIG. 28 is a rear view showing an arrangement example of each operation switch of the camera of the present invention.

FIG. 29 is a plan view showing an arrangement example of each operation switch of the camera of the present invention.

FIG. 30 is a cross-sectional view showing the relationship between the mode changeover switch and the macro button.

FIG. 31 is a cross-sectional view showing the relationship between the mode changeover switch and the macro button in an operating state different from that in FIG. 31.

FIG. 32 is a block diagram showing a control system of the camera of the present invention.

FIG. 33 is a drive circuit diagram of a zoom motor.

FIG. 34 is a flowchart showing the operation of the camera of the present invention.

FIG. 35 is a flowchart showing the operation of the camera of the present invention.

FIG. 36 is a flowchart showing the operation of the camera of the present invention.

FIG. 37 is a flowchart showing the operation of the camera of the present invention.

FIG. 38 is a flowchart showing the operation of the camera of the present invention.

FIG. 39 is a flowchart showing the operation of the camera of the present invention.

[Explanation of symbols]

 1 lens barrel block 2 finder and strobe block 3 light emitting part 4 light receiving part 4e short distance correction optical element 5 zoom motor 7 pinion 11 rear fixing plate 12 guide rod 13 front fixing plate 14 cam ring 16 front group frame 17 19 roller 18 rear group frame 20 21 Zooming cam groove 23 Shutter block 24 Front lens group frame 25 Helicoid 30 Barrier block 53 Cam plate 54 Finder block 55 Variable magnification cam groove 56 Parallax compensation cam groove 57 Strobe cam groove 58 Xenon lamp 63 64 65 Guide groove 66 66 Variable magnification Lens frame 67 Declination prism operation plate 68 Strobe case 66a 67a 68a Guide protrusion 69 70 71 Follower pin 76 Position regulation piece 90 Code plate 92 Brush 99 Release button 100 Zoom motor control unit 101 mode change switch 102 zoom switch 103 photometric switch 104 zoom encoder 109 main control unit 107 zoom motor drive circuit L1 to L6 lens P1 declination prism

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location G03B 17/04 7513-2K (72) Inventor Shigeru Kondo 2-36-9 Maenocho, Itabashi-ku, Tokyo No. Asahi Kogaku Kogyo Co., Ltd. (72) Inventor Hideki Okubo 2-36 Maeno-cho, Itabashi-ku, Tokyo No. 36 Asahi Kogaku Kogyo Co., Ltd. (72) Norio Numako 2-36 Maeno-cho, Itabashi-ku, Tokyo No. 9 In Asahi Gaku Kogyo Co., Ltd. (72) Inventor Saburo Sugawara 2-36-9 Maenocho, Itabashi-ku, Tokyo Inside Asahi Gaku Gakuin Co., Ltd.

Claims (2)

[Claims] 1. A cam ring rotatably supported by a fixed portion of a camera body so as to restrain movement in the optical axis direction; capable of rectilinearly moving forward and backward in the optical axis direction by restraining rotation on the inner diameter side of the cam ring. At least two front and rear variable power lens groups supported by the zoom lens; zooming means for moving the variable power lens groups to change the focal length in accordance with the rotation of the cam ring; The zoom lens group of (1) has a projection from the tip of the cam ring to the front of the camera body in accordance with the zooming; and an electric drive system including a motor fixed to the camera body for rotationally driving the cam ring. A characteristic lens shutter zoom lens camera. 2. The gear according to claim 1, further comprising: a gear integrally provided on an outer periphery of the cam ring and rotationally driven by an electric drive system including the motor; A lens shutter type zoom lens camera having a zoom finder optical system that changes the field of view in accordance with a change in the focal length of the zoom photographing optical system.