JP2001215566A - Coupling structure of revolving shaft and diopter- regulating device of finder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a diopter-regulating device of a finger which may be easily and surely assembled, even to a camera mounted with a cover member from the vertical direction. SOLUTION: This diopter regulating device for the finder is constituted, by dividing a diopter regulating shaft to a revolving shaft 22 and a revolving shaft 36, turnably supporting the revolving shaft 36 at a camera body 11, having an advance and retreat mechanism for a diopter regulating lens, turnably operatingly supporting the revolving shaft 22 at a cover member 12 which is attachable to and detachable from the camera body 11, respectively forming connecting slopes 22a and 36a, which incline with a plane orthogonal with an axis and parallel approximately to each other in a specific angle position around the axis on an opposing surface of a pair of the divided diopter regulating shaft and respectively forming projecting parts 22b and recessed parts 36, which engage each other at the specific angle position and of which the longitudinal direction passing the axis extends in the inclination direction of the connecting slopes on a pair of the connecting slopes 22a and 36a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary shaft coupling structure and a finder diopter adjusting device.

[0002]

2. Description of the Related Art A diopter adjusting device for a finder is of a type in which a diopter adjusting shaft is rotated to move a diopter adjusting lens in an optical axis direction and a type in which a diopter adjusting lever is slid. And is known. In the type in which the diopter adjustment shaft is operated to rotate, the operation knob for performing the operation is usually located near the eyepiece window on the back surface of the camera, and is supported by a cover member constituting the exterior of the camera body. There are two types of cover members: a type that covers the camera body from the front and back, and a type that covers the camera vertically (a direction perpendicular to the rotation axis of the operation knob). Support it,
When attaching the cover member to the camera body, the operation knob is connected to the diopter adjustment shaft supported on the camera body side. This assembly is relatively easy. On the other hand, when the cover member is put on the camera body from above and below, after the cover member is put on, the operation knob connected to the diopter adjustment shaft on the camera body side must be supported by the cover member. In other words, in the latter case, it is difficult to connect the rotation shaft of the operation knob and the cam mechanism when the cover member is put on the cover member, so that the operation knob cannot be attached to the cover member in advance, This made assembly difficult.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a finder diopter adjusting apparatus which can easily and reliably assemble a camera even when a cover member is mounted from above and below the camera. Another object of the present invention is to provide a connecting structure of a rotating shaft that can more easily and reliably connect a pair of rotating shafts from a direction perpendicular to an axis.

[0004]

SUMMARY OF THE INVENTION According to the present invention, in a mode of a structure for connecting rotating shafts, a pair of rotating shafts divided; Connecting inclined surfaces that are substantially parallel to each other at a specific angular position about the axis; and formed on one and the other of the pair of connecting inclined surfaces, respectively, engaging with each other at the specific angular position, and passing through the axis in the longitudinal direction. Have a convex portion and a concave portion extending in the inclination direction of the connection inclined surface.

According to the present invention, in a finder diopter adjusting apparatus, there is provided an optical finder having a diopter adjusting lens movable in an optical axis direction; a diopter adjusting shaft that is rotated; and a rotation of the diopter adjusting shaft. A diopter adjusting device for a finder having an advancing / retreating mechanism for moving the diopter adjusting lens in the optical axis direction by movement. Supported, the other of which is rotatably supported by a cover member detachable from the camera body, and each of the surfaces facing the pair of divided diopter adjustment axes is inclined with respect to a plane orthogonal to the axis, A connecting inclined surface which is substantially parallel to each other at a specific angular position about the axis is formed, and one and the other of the pair of connecting inclined surfaces are engaged with each other at the specific angular position, respectively, through the axis and in the longitudinal direction. Is the above ream It is characterized in that the formation of the projections and recesses extending in the direction of inclination of the inclined surface.

[0006] In any of the embodiments of the connection structure of the rotating shaft and the diopter adjusting device of the finder, it is preferable that the convex portion and the concave portion are formed over the entire connecting inclined surface. Further, it is preferable that the cross-sectional shapes of the convex portion and the concave portion are wedge-shaped. It is preferable that the inclination angle of the connecting inclined surface with respect to a plane perpendicular to the axis is 10 ° to 40 °.

[0007]

Embodiments of the present invention will be described below. 1 to 6 show a first embodiment of the present invention. The camera 10 is a camera provided with an optical finder 14 having a diopter adjusting lens movable in the optical axis direction, and has a camera body 11 and an upper cover member 12. The upper cover member 12 has an eyepiece window 20 of the optical viewfinder 14.
A rotation shaft (diopter adjustment shaft) 22 having an operation knob 21 is rotatably supported on the side of the eyepiece window 20. The operation knob 21 faces the outer surface of the upper cover member 12. As shown in FIGS. 3 to 5, the rotating shaft 22 penetrates an O-ring 23 that prevents dust from entering the inside of the camera 10, and a small-diameter portion 22 c formed on the rotating shaft 22 forms a U-shaped retainer 25. It is engaged with the portion 25a and is prevented from falling off.
The retainer 25 extends along one side of the rotating shaft 22
And has an arc-shaped portion 25b (FIG. 4) for taking play. One edge 25c of the arc-shaped portion 25b is locked to the locking step 12a of the upper cover member 12.

As shown in FIG. 3, at one end of the rotating shaft 22, there is formed a connecting inclined surface 22a inclined with respect to a plane perpendicular to the axis of the rotating shaft 22, and the connecting inclined surface 22a has a rotating inclined surface. A convex portion 22b that passes through the central axis of the shaft 20 and extends in the longitudinal direction in the inclination direction of the connection inclined surface 22a is formed on the connection inclined surface 2a.
2a is formed over substantially the entire surface. The cross-sectional shape of the protrusion 22b is wedge-shaped.

As shown in FIG. 6, a diopter adjusting lens 31 of the finder and a cam mechanism (advancing / retracting mechanism) 32 for moving the diopter adjusting lens 31 in the optical axis direction are provided on the camera body 11 side. I have. A straight advancing barrel 33 is fixed to the diopter adjusting lens 31, and a cam follower 34 is formed integrally with the straight advancing barrel 33. This straight barrel 33
Is the optical axis O of the diopter adjustment lens 31
Are guided in a straight line so as to be slidable on a guide shaft 35 fixed in parallel with the guide shaft 35. On the other hand, a cam groove 37 is formed on a rotation shaft (diopter adjustment shaft) 36 rotatably supported by the camera body 11, and the cam follower 34 is
7 is engaged. Therefore, when the rotation shaft 36 rotates,
The cam follower 34 advances and retreats along the cam groove 37, and the diopter adjusting lens 31 advances and retreats in the optical axis O direction.

At one end of the rotating shaft 36, a connecting inclined surface 36a is formed which is inclined with respect to a plane perpendicular to the axis of the rotating shaft 36. The connecting inclined surface 36a passes through the center of the rotating shaft 36, A concave portion 36b whose longitudinal direction extends in the inclination direction of the connection inclined surface 36a is formed over substantially the entire surface of the connection inclined surface 36a. The cross-sectional shape of the concave portion 36b is a wedge shape corresponding to the convex portion 22b.

The connecting inclined surfaces 22a and 36a of the rotating shaft 22 and the rotating shaft 36 have an inclination angle with respect to a surface orthogonal to the axis of each rotating shaft, and a convex portion 22b formed on each.
And the recess 36b have the same cross-sectional shape (wedge shape). Therefore, the rotating shaft 22 and the rotating shaft 36 engage with each other at an angular position (specific angular position) at which the respective connection inclined surfaces are substantially parallel.

When assembling the camera 10, the upper cover member 12
Is mounted on the camera body 11 from above. At this time, the connecting inclined surface 22a of the rotating shaft 22 is
b of the rotating shaft 36 so that b faces in the vertical direction.
6a is set so that the concave portion 36b faces up and down, and the connecting inclined surfaces are substantially parallel to each other. Therefore, as shown in FIG. 4, the connecting shafts 22a and 36a of the rotating shafts 22 and 36 are substantially parallel to each other, and the convex portions 22b and the concave portions 36b are engaged with each other and connected. Since the rotating shaft 22 and the rotating shaft 36 are engaged by the connecting inclined surfaces 22a and 36a, there is no axial displacement between them. It is preferable that the angle of inclination of the connecting inclined surfaces 22a and 36a with respect to a surface orthogonal to the axis is 10 ° to 40 °.

As described above, when the upper cover member 12 is mounted on the camera body 11 and the rotating shaft 22 and the rotating shaft 36 are connected, when the operation knob 21 is rotated, the rotating shaft 22 and the connected rotating shaft 22 are rotated. The cam mechanism 30 operates (rotates) via the shaft 36, and the diopter adjustment lens 31 advances and retreats in the direction of the optical axis O, so that diopter adjustment of the finder can be performed.

FIG. 7 shows another embodiment of the cam mechanism 40 for moving the diopter adjusting lens 31 in the optical axis direction. In the cam mechanism 40, a large-diameter portion and a small-diameter portion are formed on the rotating shaft 36, and a slope cam (end face cam) 41 is formed at a boundary between the large-diameter portion and the small-diameter portion. The diopter adjustment lens 31 has an interlocking projection 42 projecting perpendicularly to the paper surface of FIG. 7, and is guided straight by the guide frame 43 in the optical axis O direction. On the other hand, between the inclined cam 41 and the diopter adjusting lens 31, a swing arm 44 is rotatably mounted on a fixed shaft 45.
4 is always in contact with the slope cam 41 by a biasing means (not shown). The other end of the swing arm 44 on the diopter adjustment lens 31 side is engaged with the interlocking projection 42 in a bifurcated shape.

The first inclined plane 36a having a concave portion 36b formed on the end face of the rotating shaft 36 and the procedure for connecting the rotating shaft 22 on the upper cover member 12 side to the rotating shaft 36 are described in the first embodiment. Same as the form. Therefore, also in this embodiment, when the rotating shaft 22 is rotated via the operation knob 21 in the assembled state, the connecting inclined surfaces 22a and 3
The rotating shaft 36 connected by the concave portion 6a and the convex portion 22b rotates. Then, the swing arm 44, one end of which is engaged with the inclined cam 41 of the rotating shaft 36, swings around the fixed shaft 45 as a fulcrum, and the diopter adjusting lens via the interlocking projection 42 engaged with the forked portion. 31 moves back and forth in the optical axis O direction. That is, the diopter of the finder can be adjusted.

In the above, the moving mechanism for moving the diopter adjusting lens 31 in the optical axis direction is a cam mechanism. However, the moving mechanism is not limited to the cam mechanism, and may be, for example, a feed screw mechanism.

As described above, the camera 10 of the present embodiment
In order to easily and surely connect the rotation shaft 22 connected to the operation knob 21 and the rotation shaft 36 connected to the cam mechanism 32 (40), the cover member is set up and down from the camera 10. Even in the case of a configuration for mounting, assembly can be easily performed.

The above is an embodiment in which the present invention is applied to a diopter adjusting device for a finder. However, the present invention is not limited to this, and can be applied to a general structure for connecting a pair of divided rotary shafts. Can be applied.

[0019]

According to the present invention, it is possible to obtain a diopter adjusting device for a finder which can easily and surely assemble even a camera having a cover member mounted from above and below the camera. Also, more generally, a connecting structure of rotating shafts that can easily and reliably connect a pair of rotating shafts from a direction orthogonal to the axis is obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an entire camera having a finder diopter adjusting device according to the present invention.

FIG. 2 is a rear view showing the vicinity of an operation knob of the camera.

FIG. 3 is a sectional view showing the vicinity of an operation knob of an upper cover member of the camera.

FIG. 4 is a cross-sectional view showing a state where an upper cover member is mounted on a camera body.

FIG. 5 is a view as viewed in the direction of the arrow X in FIG. 4;

FIG. 6 is a view showing a cam mechanism of the diopter adjusting device of the finder.

FIG. 7 is a diagram showing another cam mechanism of the diopter adjusting device of the finder.

[Explanation of symbols]

 Reference Signs List 10 camera 11 camera body 12 upper cover member (cover member) 14 optical finder 20 finder window 22 rotating shaft 22a connecting inclined surface 22b convex portion 36 rotating shaft 36a connecting inclined surface 36b concave portion 31 diopter adjusting lens 32 cam mechanism

Claims (8)

[Claims] 1. A pair of divided rotating shafts; each of which is inclined with respect to a plane orthogonal to an axis formed on a facing surface of the pair of rotating shafts, and is substantially parallel to each other at a specific angular position about the axis. And a convex portion and a concave portion, which extend along the axis and extend in the direction of inclination of the connecting inclined surface, which engage with each other at the specific angle positions respectively formed on one and the other of the pair of connecting inclined surfaces. A coupling structure of a rotating shaft, characterized by having; 2. The connecting structure of a rotary shaft according to claim 1, wherein the convex portion and the concave portion are formed over substantially the entirety of the connecting inclined surface. 3. The connecting structure of a rotary shaft according to claim 1, wherein said convex portion and said concave portion have a wedge-shaped cross section. 4. The connecting structure of a rotary shaft according to claim 1, wherein an angle of inclination of the connecting inclined surface with respect to a plane orthogonal to the axis is 10 ° to 40 °. Construction. 5. An optical finder having a diopter adjusting lens movable in an optical axis direction; a diopter adjusting shaft that is operated to rotate; and the diopter adjusting lens being moved in the optical axis direction by rotating the diopter adjusting shaft. A finder diopter adjustment device having an advancing / retracting mechanism for moving the diopter, wherein the diopter adjustment axis is divided and one of the diopter adjustment axes is rotatably supported by a camera body having the advancing / retracting mechanism, and the other is relative to the camera body The pair of divided diopter adjustment axes are supported on a detachable cover member so as to be rotatable, and are inclined with respect to a plane orthogonal to the axis at a specific angle position about the axis. A connecting inclined surface which is substantially parallel is formed, and one and the other of the pair of connecting inclined surfaces are respectively engaged with each other at the specific angular position, and a longitudinal direction passing through an axis extends in an inclined direction of the connecting inclined surface. Part and recess A diopter adjustment device for a finder, wherein the diopter is adjusted. 6. The diopter adjustment device according to claim 5,
A diopter adjusting device for a finder, wherein the convex portion and the concave portion are formed over substantially the entirety of the connection inclined surface. 7. A diopter adjusting device for a finder according to claim 5, wherein said convex portions and concave portions have wedge-shaped cross sections. 8. The diopter adjusting device according to claim 5, wherein an inclination angle of said connecting inclined surface with respect to a plane orthogonal to an axis is 10 ° to 40 °. apparatus.