JPS6346418A - Autofocusing camera - Google Patents

Abstract

PURPOSE:To prevent a range adjusting member such as a manual focusing distance ring from being moved even at the time of autofocusing by providing the titled camera with an autofocusing driving means, a manual focusing driving means, an optical system moving means, and a clutch means. CONSTITUTION:A focusing detecting element 28 rotates a motor until the quantity of incident light is maximized by a lens L and the rotation rotates a turning frame (optical system moving means) 4 through a decelerating intermediate gear array 34, a focusing driving shaft 30, rotary driving transmitting gears 31, 32, a focusing driving shaft 20, gears (autofocusing means) 21, 8. Consequently, a mirror barrel 2 having a helicoil screw 3 is automatically moved in the front and back direction, and when the lens L is reached a focusing position, the mirror barrel 2 is stopped by the stop of rotation of the motor 33. At the time of autofocusing, a gear (manual focusing driving means) 14 of a manual distance adjusting member 12 is not engaged with the gear 8 of the frame 4, so that the gear 14 is not turned. In case of executing focusing operation manually, when the member 12 is pressed a projecting part (clutch means) 25 presses a gear 21 by pressing the member 21, the gear 14 is engaged with the gear 8, so that the frame 4can be rotated and adjusted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is an autofocus camera, in particular, a focus detection device, a focus drive motor, etc. are disposed on the camera body side, and The present invention relates to an autofocus camera in which various interchangeable lenses, which are removably attached to the camera body, are moved and focused by the drive of a motor on the camera body side.

[Prior Art] As is well known, various autofocus cameras of this type have been proposed in the past. For example, in a single-lens reflex camera with interchangeable lenses, this automatic focusing device normally has a focusing drive device built into the camera body, and uses rotational driving force transmitted from this drive device to the lens barrel. It has a built-in drive device for focusing the lens. The camera body and lens barrel are connected by their mounts, and this connection allows the driving force to be transmitted between the two! The a side (cover) is connected via a clutch so that the rotational driving force for driving the lens is transmitted from the driving device inside the camera body to the lens barrel side.

In addition, in an autofocus camera configured in this way,
Since there are some subjects that cannot be focused automatically, we have made it possible to focus manually.
has been completed.

[Problems to be Solved by the Invention] However, in an autofocus camera configured such that the focusing operation can be switched between automatic and manual, it is common that the manual focusing operation is switched during the autofocusing operation. There is a problem with the distance ring rotating and touching your hands and fingers when operating autofocus, causing discomfort.

The present invention was made in order to eliminate such problems, and the distance fI of the distance ring for manual focusing even during autofocus! An object of the present invention is to provide an autofocus camera configured so that an adjustment member does not move.

[Means and effects for solving the problem] In order to achieve the above-mentioned features, the present invention provides an automatic focus camera capable of automatic focus adjustment and manual focus adjustment, which includes a driving means for automatic focus adjustment and a drive means for automatic focus adjustment. , a clutch means for selectively connecting the manual focusing drive means, the optical system moving means for moving the photographing optical system, and the automatic focus adjustment drive means and the manual focus adjustment drive means to the optical system moving means. It is characterized by having the following.

[Example] Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1 is a sectional view of a main part of an autofocus camera showing an embodiment of the present invention.The autofocus camera 1 of this embodiment uses a relatively small interchangeable lens such as a wide-angle or standard lens. It is being In the figure, reference numeral 2 denotes a lens frame that holds the photographing lens L, 3 denotes a helicoid screw provided on the rear outer peripheral surface of the lens frame 2, and 4 denotes a helicoid screwed into the helicoid screw 3 of the lens frame 2 on the inner surface. A rotating frame 6 is provided with a screw 5, an outer recoid frame 6 is provided with a helicoid screw 7 on the inner surface thereof which is screwed into a vericoid screw 4a provided on the rear outer peripheral surface of the rotating frame 4; A gear is provided on the outer circumferential surface of the movable frame 4 near the middle of the front end, 9 is a protruding piece forming a pair of keys protruding in the vertical direction near the front end of the rotary frame 4, and 10 is the outer recoid frame 6. A lens mount frame 11 is fixed to the rear end surface by a set screw log, a camera body mount frame 12 is fitted with the lens mount frame 10 by known means, and a rubber band 13 for sliding is attached to the outer peripheral surface. <
8, and 15 is the manual focus adjusting member, which is a short cylindrical manual focus range ring having a gear 14 formed on its inner peripheral surface to mesh with the gear 8 of the rotating frame 4; The lens mount frame 1 is formed at the rear of the lens mount frame 1.
0, a cylindrical portion that fits into the front inner surface of the lens frame 2;
is a ring-shaped distance display member that is rotatably fitted to the outer circumferential surface of the rear part of the filter mounting frame 16, which has a smaller diameter. A narrow collar 17a is formed, and is rotatably fitted into a circumferential groove 12a bored on the inner surface of the front portion of the distance adjusting member 12. Moreover, key grooves 18 are bored in the inner surface of the same distance display member 17 in the optical axis direction at the top and bottom, and the protruding pieces 9 of the rotating frame 4 are fitted into the key grooves 18, respectively. That is, the distance display member 17 moves together with the distance adjustment member 12 in the front-rear direction, and rotates together with the rotation frame 4 in the rotation direction. Further, a distance display indicator 19 is provided on the outer circumferential surface of the middle of the filter mounting frame 16, and extends to a portion where the diameter is further reduced, and a manual distance adjustment section 12 is provided as shown in FIG. , so that it can be seen without any problem even when moved backwards.

At the bottom of the lens barrel configured in this way, a focusing drive mechanism on the lens barrel side, which is connected to the focusing drive mechanism f+M arranged on the camera body side, is arranged as follows. ing. That is, a focusing drive IFIII 2o on the barrel lens side is rotatably supported in a through hole 10b formed in the lower part of the outer recoid frame 6 parallel to the optical axis, and a coaxial 20
The rear part projects into the lens mount 1O, and the rear end is connected to a drive transmission gear 31 that is integrally attached to the tip of a focusing drive shaft 30 on the camera body side that protrudes from the body mount 11 on the camera body side. A meshing gear 32 is integrally attached. A gear 21 that meshes with the gear 8 of the rotating frame 4 is integrally attached to the front end of the drive shaft 2°. An elastic coil spring 24 is interposed between the gear 21 and the outward recoid frame 6, and although the drive shaft 20 is given the habit of moving forward, the front surface of the gear 21 is The distance adjustment member 12
The gear 21 is brought into contact with a ring-shaped protrusion 25 formed to protrude from the rear surface, and the gear 21 is in the position shown in FIG.
It is designed to be restrained at a position where it meshes with gear 8.

On the other hand, as is well known, there is a photographic lens L inside the camera body.
A movable reflecting mirror 26 inclined by 45'' with respect to the optical axis is disposed, and a subject light image incident from the photographing lens L is reflected upward at right angles by the movable reflecting mirror 26 and focused on a focusing glass 29. The formed object light image is observed through an eyepiece lens through a pentagonal Datsuha prism (not shown).A part of the object light image is also observed at the center of the movable reflecting mirror 26. The light passes through a semi-transparent part provided in the section, is reflected downward by the auxiliary reflecting mirror 27 rotatably disposed perpendicularly to the rear surface of the reflecting mirror 26, and is positioned at a position conjugate with the film surface below. Focus detection element 2 arranged
The image is formed on the -1- plane of 8. The output signal detected by the focus detection element 28 controls the rotation of a motor 33 which is a drive source disposed below the focus detection element 28 via an electric circuit (not shown). The rotation of the drive shaft of the motor 33 is decelerated and transmitted to the focusing drive shaft 30 on the camera body side via the deceleration intermediate gear train 34, and the rotation of the same shaft 30 meshes with the u-transfer transmission gear 31. The rotational drive wave is transmitted to the focusing drive shaft 20 on the lens barrel lens side via the rotational drive wave transmission gear 32. This rotation of the focusing drive shaft 20 meshes with a gear 21 that is integrated with the same shaft 20."-2 Gear 8 of the rotation frame 4
The rotating frame 4 is rotated through the. When this rotating frame 4 rotates, the lens frame 2 moves back and forth via the helicoid screw 5 of the open frame 4 and the helicoid screw 3 of the lens frame 2 screwed thereto, and the photographing lens L is adjusted. It is designed to be controlled by focus. At this time, that is, in the state shown in Fig. 1, the manual distance is 12
! Since the gear 14 of the J-section member 12 does not mesh with the gear 8 of the rotating frame 4, the member 12 does not rotate.
Since the projection piece 9 of the rotating frame 4 is fitted into the keyway 18 of the distance display member 17, the distance display member 17 is rotated by the rotation of the rotating frame 4, and the distance is displayed on the distance display indicator 19. Can be done. In this case, since the threading lead between the helicoid screw 7 of the outer helicoid frame 6 and the helicoid screw 4a of the rotating frame 4 is small, the engagement between the gear 8 of the rotating frame 4 and the gear 21 of the drive Id 120 is small. The manual distance adjustment member 12 and the distance display member 17 do not come off.
None of them move back and forth.

Further, the lens frame 2 is installed outwardly at the bottom of the recoid frame 6 in a hole 35 parallel to the optical axis, which is bored in a part of its rear part, and is folded forward at a right angle. Since the bent guide pin 36 is fitted, it is possible to move only in the front-back direction without rotating.

Next, the operation of the autofocus camera 1 configured as above will be explained. As is well known, the focus detection element 28 detects the point where the amount of light from the object incident from the photographing lens L is at its maximum as the in-focus point, and uses its output signal to operate the motor 33 until the amount of light from the photographic subject reaches its maximum. Rotate. The rotation of this motor 33 is decelerated and transmitted to the focusing drive shaft 30 on the camera body 23 side via the two-legged reduction intermediate gear train 34, and the rotation of the drive shaft 30 is transmitted to the rotational drive transmission gear 311. The driving wave is transmitted to the focusing drive shaft 20 on the lens barrel side via the drive wave transmission gear 32. 20 When the focusing drive shaft 20 rotates, the gear 21 integrated with the same shaft 20
The rotating frame 4 is also rotated via the gear 8 which meshes with the gear 21. When this rotating frame 4 rotates, the lens barrel 2, which holds the helicoid screw 3 which is screwed into the helicoid screw 5 of the open frame 4, is rotated in the front-rear direction because the rotation direction is restrained by the pin 36. When the photographic lens L reaches the focal position after automatically moving until it reaches the focal position, the rotation of the motor 33 is stopped and the photographing lens L is stopped at the intermediate position.

In addition, during this autofocus, there is a manual pressure type, and an I
Since the gear 14 of the joint member 12 is separated from the gear 8 of the rotation frame 4 and does not mesh with it, the manual distance and the adjustment member 12
does not rotate. When performing a manual focusing operation, when the manual distance adjusting member 12 is pushed in the direction of the arrow from the state shown in FIG. is the gear 2 integrated with the drive shaft 20.
1 in the same direction against the elasticity of the coil spring 24, the gear 21 and the gear 8 of the rotation frame 4 are disengaged, and the gear 14 of the manual distance adjustment member 12 is moved into the gear 8. mesh with. Therefore, by manually rotating the member 12, the rotating frame 4 can be freely rotated via the gear 14.8. That is, it is possible to manually adjust the focus of the barrel lens.

At this time, the distance display member 17 operates integrally with the distance adjusting member 12 in the front-back direction and with the rotation frame 4 in the rotation direction, as described above. Further, the manual pressure member 12 is appropriately locked at the positions shown in FIGS. 1 and 2 by a click stop mechanism (not shown).

3 and 4 are cross-sectional views of an autofocus camera showing another embodiment of the present invention. The configuration on the camera body side of the autofocus camera 40 in this embodiment is I+S2, which is exactly the same as that in FIG. Regarding the structural parts, the same constituent members whose functions are the same are given the same reference numerals as those of the constituent members shown in FIG. 1, and the explanation thereof will be omitted.

This autofocus camera 40 uses a long focal length lens, that is, a large telephoto interchangeable lens. Therefore, the lens barrel is also large, and the amount of movement and movement force of the lens frame 2 are also large. In FIG. 3, the focusing mechanism on the lens barrel side is arranged at the rear lower part of the lens barrel. That is, the gear 31 of the focusing drive 4ilh 30 on the camera body side in FIG.
A focusing drive shaft 41 on the lens barrel side having a gear 41a meshing with the lens barrel is rotatably supported. The rotation of the focusing drive shaft 41 is transmitted to the drive shaft 45 via an intermediate reduction gear train 42 and a universal joint 44 in the middle.
Rotation of the coaxial shaft 45 rotates a rotating frame 54 that carries a gear 52 with a wide tooth width that meshes with a drive gear 46 integrated with the coaxial shaft, and a mirror having a helicoid screw 2a that engages with a helicoid screw 54a of an open frame 54 rotates. The frame 2 moves back and forth to perform focusing operations. Since a telephoto lens with a long focal point has a large amount of lens movement and a large amount of rotational force of the helicoid screw, the rotation of the focusing drive shaft 41 is further decelerated via the reduction gear train 42 as described above. These reduction ratios are appropriately determined by the helicoid force of the lens barrel. The front part of the drive shaft 45 is supported by a conical through hole 48 of a bearing member 47, and is driven through the universal joint 44 by vertical movement of the bearing member 47. axis 4
5 is adapted to change its axial direction by moving its front part up and down. The bearing member 47 is ring-shaped, and a protruding piece 49 that protrudes rearward from its upper and lower parts is provided at the front end of the outer recoid crusher 50 and fits into the downward slot 51. By this, it is possible to move vertically, and the coaxial bearing member 47 and the recoid frame 5 are moved outwardly.
0 and 0 are arranged in close contact with each other in the optical axis direction so as not to separate due to a mechanism hX (not shown). In the state shown in FIG. 3, that is, in the automatic focusing state, as shown in the figure, the bearing part 47 is in the one-way position, and the focusing drive shaft 45 is parallel to the optical axis and is coaxial. Drive gear 46 integrated with 45
is meshed with the gear 52 of the rotating frame 54. In the case of a telephoto lens, the lead of the helicoid screw 53 of the recoil frame 50 to the outside is large, and the amount of movement of the rotation frame 54 in the front and back direction is also large, so the tooth width of the gear 52 of the rotation frame 54 is equal to the width of the teeth of the gear 52 of the rotation frame 54. It is large enough to prevent it from coming off the gear 46. A manual distance adjustment ring 5 is attached to the bearing part 47.
5 is rotatably fitted in the ring 55, and the rotating frame 54 is attached to the inner circumferential surface of the flange formed by the inward protruding edge near the front of the ring 55.
A gear 56 is provided which meshes with the gear 52 as appropriate. Further, a ring-shaped distance display member 57 is rotatably fitted to the front end of the distance adjustment ring 55, and key grooves 58 in the optical axis direction are provided on the upper and lower inner surfaces of the distance display member 57. ing. A key 59 attached to the front end of the rotating frame 54 is fitted into the key groove 58 . The distance adjustment ring 55 is pushed upward with respect to the rotating frame 54 by an unillustrated elastic push-up member, as shown in FIG. 3, and placed in an eccentric state. In this state, the bearing member 47 fitted into the distance adjustment ring 55 is also pushed up in three directions to support the drive shaft 45 parallel to the optical axis, and the drive gear 46 is connected to the gear 52 of the rotating frame 54. It is designed to mesh with the Also, at this time, the gear 56 of the distance adjustment ring 55 is set to ``1''.
It is separated from the gear 52 of the rotating frame 54 and does not mesh with it. From the state shown in FIG. 3, when the manual distance adjustment ring 55 is pushed down by hand against the elastic force of the elastic push-up member, as shown in FIG.
7 is also pushed down, the front part of the focusing drive shaft 45 moves downward, and the drive gear 46 and the gear 5 of the rotation frame 54 move downward.
2 is disengaged. On the other hand, when the adjusting ring 55 is pushed down, the gear 56 on the upper part of the ring 55 meshes with the gear 52 of the rotating frame 54, so the ring 55 is pushed down.
5 is pressed down and rotated, the rotation frame 54 can be freely rotated. That is, it is possible to freely focus manually. Although not shown, this fourth
Of course, a click stop mechanism is provided to maintain the manual distance adjustment ring 55 in the state shown in the figure.

Further, since the operation of the distance display member 57 is similar to that of the distance display member 17 in FIG. 1, a description thereof will be omitted. In addition, in FIG. 3.4, the reference numeral 38 indicates a non-slip member 11 attached to the outer surface of the manual distance m adjustment ring 55.
Reference numeral 3 designates a pipe-shaped light shielding member whose base is fixed to the rear end surface of the recoid frame 50 outwardly.

[Effects of the Invention] As described above, according to the present invention, manual distance #1 is made up of a distance adjustment ring for performing manual focus operation. Since the S+1 section member is separated from the drive source for automatic focusing during autofocusing, the manual distance adjustment member for manual focusing does not rotate during autofocusing, so manual distance adjustment during autofocusing is not possible. You will not feel any discomfort even if you touch the parts. What's more, even when using manual focus, the lens holds well and is less prone to camera shake, and since the distance is displayed even during manual focusing, it has the remarkable effect of allowing you to check the distance.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts of an autofocus camera showing one embodiment of the present invention, FIG. 2 is an operational diagram of the autofocus camera shown in FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a sectional view of essential parts of an autofocus camera showing an example. FIG. 4 is an operational diagram of the autofocus camera shown in FIG. 3 above.

Claims (1)

[Scope of Claims] An automatic focus camera capable of automatic focus adjustment and manual focus adjustment, comprising: an automatic focus adjustment drive means; a manual focus adjustment drive means; an optical system moving means for moving a photographing optical system; An automatic focusing camera comprising: a clutch means for selectively connecting the automatic focusing driving means and the manual focusing driving means to the optical system moving means.