JP3251131B2 - Camera mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a mount structure of an AF camera having a range finder adjusted to a magnification according to a type (angle of view) of an interchangeable lens.

[0002]

2. Description of the Related Art In recent years, autofocusing of single-lens reflex cameras has become popular, and accordingly, the enlargement of a camera body and a mounting portion has been conspicuous. When adopting the interchangeable lens type in the AF compact camera, it is necessary to transmit information or driving force between the camera body and the lens side similarly to the single-lens reflex camera. In a rangefinder camera, the angle of view of the viewfinder must be automatically changed according to the focal length of the lens to be mounted.
Compared to a single-lens reflex camera, the number of connection points between the camera body and each function on the lens side increases, the connection structure becomes complicated, and the camera mount itself includes elements that become large. On the other hand, downsizing of the range finder type AF compact camera is always required.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mount structure for a camera having a lens connection range finder type AF camera, in which connection between respective functions is reliable and the connection structure can be made compact.

[0004]

In order to achieve the above object, a camera mounting structure according to the present invention is an AF camera having a range finder capable of exchanging lenses and changing magnification according to the focal length of the interchangeable lens. On the camera side, a mount that serves as a reference surface for the flange back, a bayonet claw engagement portion connected to the mount, and a viewfinder interlocking mechanism that is coupled to the viewfinder angle-of-view setting mechanism and that can move in the circumferential direction of the lens barrel. A pin, a lens driving coupler for transmitting a driving force of a motor for performing AF or the like, a camera-side electrical connection for transmitting information such as focus information, and a lens mounting SW for detecting mounting of a lens. The interchangeable lens includes a bayonet claw engaged with the bayonet claw engagement portion and an engagement pin engaged with the finder interlocking pin. A focus ring coupler connected to the lens drive coupler; a focus ring coupler connected to the lens drive coupler; and a focus ring coupler connected to the lens drive coupler. By inserting the interchangeable lens into the mount from a predetermined position , the lens-side electrical connection
By rotating and sliding the connecting portion to the camera-side electrical connection portion,
Without pressure contact and electrical coupling
Apply a ring coupler to the lens drive coupler in the optical axis direction.
The viewfinder interlocking pin is pushed by the engagement pin in the circumferential direction of the lens barrel by an amount corresponding to the focal length of the interchangeable lens by rotating the spigot ring. The magnification is adjusted, the bayonet claw is locked to the bayonet claw locking section, and the lens mounting SW lever is operated to detect the mounting of the interchangeable lens.

[0005]

According to the above construction, the connection of each functional unit is ensured, and the mount is compact.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings. FIG. 1 is a perspective view showing the appearance of an interchangeable lens rangefinder AF camera employing a mount structure according to the present invention. On the front face of the upper cover, a passive AF distance measuring section 7 is arranged together with the range finder section 3, and on the upper face of the upper cover, a main switch 5, a release button 6, and a focus dial 4 are arranged. An interchangeable lens 2 is detachable from the camera body 1. A camera-side electrical contact pin 9 and a lens driving coupler 8 are provided below the mount 11 of the camera. Also mount 1
On the right side of 1 is a lens attaching / detaching button 10 for detaching a lens.
Is arranged. On the other hand, a spigot ring 12 is attached to the interchangeable lens 2 so as to be rotatable by a predetermined angle.

In FIG. 1, connection parts near the mount of other functional parts are omitted, and they are described in detail in FIG.
FIG. 2 is a front view showing an embodiment of a camera mounting structure according to the present invention. Four bayonet claw locking portions 17a, 17b, 17c, and 17d are provided continuously inside the mount 11. The mount 11 has four screw holes 14a, 1
Screwed to the camera body by 4b, 14c and 14d. A finder interlocking pin 15 is provided inside the mount between the bayonet claw locking portions 17a and 17d,
It can be engaged with an engagement pin 19 (see FIG. 3) described later. The finder link pin 15 is movable in the circumferential direction of the lens barrel.

A lens positioning pin 1 serving as a mark of the position of the lens when mounted near one end of the bayonet claw locking portion 17d.
6 have been planted. Bayonet claw locking portions 17a and 17
A lens lock lever 14 to which a biasing force is applied in the front direction on the paper is disposed inside the mount between the positions b. The lens lock lever 14 can be moved rearward on the sheet against the urging force by pressing the lens attaching / detaching button 10.
The camera-side electrical contact pins 9 provided near the lower part of the mount are configured to be depressed when a biasing force is applied to the front of the paper and pressed by a later-described lens-side electrical contact pad 21 (see FIG. 3) on the interchangeable lens side. Have been. The lens mounting SW lever 13 is disposed behind the bayonet claw locking portion 17b.

FIG. 3 is a diagram for explaining a connection state of each function of the camera body and the interchangeable lens. Hereinafter, the mounting structure of the present invention will be described with reference to FIGS. By inserting the interchangeable lens 2 into the mount 11 while positioning with the lens positioning pin 16 and rotating the spigot ring 12, the bayonet claw 20 is locked to the bayonet claw locking portion 17 and the interchangeable lens is mounted. At this time, the engagement pin 1 provided on the spigot ring 12
9 moves the finder link pin 15 in the circumferential direction of the lens barrel by an amount corresponding to the focal length of the interchangeable lens. The angle of view of the finder angle-of-view setting mechanism 18 is adjusted by the movement of the finder interlocking pin 15, thereby changing the magnification of the range finder section 3.

FIGS. 4A and 4B are diagrams showing details of a finder angle-of-view setting mechanism, wherein FIG. 4A is a front view and FIG. 4B is a side view. The gear plate 31 on which the finder interlocking pin 15 is implanted is attached to the main plate 36 so as to be slidable rightward. The gear plate 31 is biased leftward by a spring 35, and the rack 31 a meshes with the gear 32. The gear 32 meshes with the gear 33 and is further connected to a rack 34 d of the cam plate 34. When the engagement pin 19 is pushed from the left side of the finder interlocking pin 15 by an amount corresponding to the focal length of the interchangeable lens,
The gear plate 31 moves rightward against the urging force of the spring 35. As a result, the cam plate 34 also moves rightward.

FIG. 5 is a diagram showing details of a range finder optical system in which the angle of view can be changed by a finder angle of view setting mechanism. The cam plate 34 has long grooves 34a, 34b and 3
4c. The finder objective lens 38 is composed of a plurality of lens groups, each of which has a lens frame 4.
2, 43 and 44, respectively. Pins 42a implanted in the lens frames 42, 43 and 44,
43a and 44a are long grooves 34a, 34b and 34c
Respectively. Light from the subject passing through the objective lens 38 passes through the mirror 41 and the condenser lens,
The light reaches the eyepiece 39 via the pentaprism 40. When the cam plate 34 moves rightward, the long grooves 34a,
34b and 34c also move rightward, whereby each lens frame moves in a direction perpendicular to the moving direction of the cam plate 34, and the objective lens 38 is adjusted to a magnification corresponding to the focal length of the interchangeable lens.

1 and 3, a lens positioning pin 1 is shown.
When the interchangeable lens 2 is inserted after being aligned at 6, the lens-side electric contact pads 21 are pressed against the camera-side electric contact pins 9 to be electrically connected. Further, the focus ring coupler 50 is coupled to the lens driving coupler 8. On the camera side, a CPU (control circuit) 29 performs arithmetic processing and the like for focus control, and performs other control necessary for the camera. The CPU 29 indicates the voltage value of the AF or MF from infinity to the nearest by operating the focus dial 4. The lens side circuit 23 in the interchangeable lens 2 includes a lens type determination signal output circuit and a flange back correction signal output circuit. The lens type determination signal output circuit outputs a voltage (for example, a voltage corresponding to a wide-angle lens, a standard lens, and a telephoto lens) corresponding to the focal length (angle of view) of the interchangeable lens. The flange back correction signal output circuit outputs a flange back correction signal at the time of focus control, and performs fine adjustment of the flange back.

The lens type determination signal and the flange back correction signal are sent to the CPU 29 through the lens-side electric contact pads 21 and the camera-side electric contact pins 9. CPU 29
Determines which type of interchangeable lens is attached based on the voltage value of the lens type determination signal, and reads lens information corresponding to the interchangeable lens from the nonvolatile memory 30.
The CPU 29 calculates the number of motor drive pulses for bringing the focus ring 51 from the reference position of the lens to the in-focus position based on the ranging information, the lens information, and the flange back correction signal from the passive ranging unit 7 in the AF mode. In the MF mode, the focus dial 4
Similarly, the number of motor drive pulses is calculated on the basis of the distance information set by. The CPU 29 includes a motor drive circuit 28
Is controlled, the motor 27 is rotated, the speed is reduced by the reduction gear group 26, and the focus ring 51 is rotated via the lens driving coupler 8 and the focus ring coupler 50 to move the lens forward and backward. The interchangeable lens 2 is provided with a lens code board 24, and a lens brush contacts and slides on the code pattern of the lens code board 24 according to the rotation of the focus ring 51, and a code corresponding to the focus ring position is provided by a lens-side electrical contact pad. 21, camera side electrical contact pin 9
Is sent to the CPU 29 via the.

FIGS. 6A and 6B are views showing details of the lens lock mechanism, wherein FIG. 6A is a front view and FIG. 6B is a side view. The lens attaching / detaching button 10 is attached to a lens lock lever base plate 46, and the periphery of the lens attach / detach button 4 is
5 is covered. The lens lock lever 14 is coupled to the lens mounting / dismounting button 10 so as to be pushed downward by pressing down the lens mounting / dismounting button 10. When the spigot ring 12 is rotated by a predetermined angle, the lens lock lever 14 is engaged with the engagement groove 22. When the lens is detached, pressing the lens attaching / detaching button 10 releases the engagement groove 22 of the spigot ring, and the spigot ring 12 can be rotated counterclockwise.

FIG. 7 is a diagram showing details of a mechanism for detecting the mounting of a lens. The lens mounting SW lever 13 is a shaft 47
It is rotatably mounted on. One end of the lens mounting SW lever 13 is biased clockwise by a spring 48, and this end is connected to a contact terminal 49 b of a switch 49.
Presses the protruding portion 49c which is extended. Therefore, the contact terminal 49b contacts the other contact terminal 49a,
The switch 49 is on. The spigot ring 12 hits the other end of the lens mounting SW lever 13 slightly before the position where the spigot ring 12 rotates and stops. When the spigot ring 12 further rotates by the interlocking angle after the collision, the lens mounting SW lever 13 rotates counterclockwise, and the switch 49 is turned off to detect that the lens is mounted.

[0016]

As described above, according to the present invention,
In the lens replacement range finder AF camera, the connection between the camera body and each function on the lens side is reliable, and a compact mounting structure can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of an AF range finder camera employing a mounting structure according to the present invention.

FIG. 2 is a front view showing an embodiment of a camera mounting structure.

FIG. 3 is a diagram for explaining a connection structure of each function on a camera side and an interchangeable lens side.

FIG. 4 is a diagram showing details of a finder angle-of-view setting mechanism;
(A) is a front view, (b) is a side view.

FIG. 5 is a diagram showing details of a range finder optical system.

6A and 6B are diagrams showing details of a lens lock mechanism, and FIG.
Is a front view, and (b) is a side view.

FIG. 7 is a diagram showing details of a mechanism for detecting lens attachment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Camera body 2 ... Interchangeable lens 3 ... Range finder part 4 ... Focus dial 5 ... Main switch 6 ... Release button 7 ... Passive distance measuring part 8 ... Lens drive coupler 9 ... Camera side electric contact pin 10 ... Lens detachable button 11 ... Mount 12: spigot ring 13: lens mounting SW lever 14: lens lock lever 15: finder interlocking pin 16: lens positioning pin 17: bayonet claw locking portion 18: finder view angle setting mechanism 19: engagement pin 20: bayonet claw 21 ... Lens side electric contact pads 22 ... Engaging grooves 23 ... Lens side circuit 24 ... Lens code board 25 ... Encoder 26 ... Deceleration gear group 27 ... Motor 28 ... Motor drive circuit 29 ... CPU 30 ... Non-volatile memory 31 ... Gear plate 32 33 ... Gear 34 ... Cam plate 35 ... Spring 36 ... Base plate 38 finder objective lens 39 eyepiece 40 pentaprism 41 mirror 42, 43, 44 lens frame 45 lens lock ring 46 lens lock lever base plate 47 shaft 48 spring 49 switch

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 62-127536 (JP, U) Japanese Utility Model Sho 58-105532 (JP, U) Japanese Utility Model Sho 37-25054 (JP, Y1) (58) Field (Int.Cl. ⁷ , DB name) G03B 17/14 G02B 7/08

Claims (1)

(57) [Claims] 1. A lens having a range finder capable of exchanging lenses and changing magnification according to the focal length of the interchangeable lens.
In the F-camera, on the camera side, a mount serving as a reference surface of a flange back, a bayonet claw locking portion connected to the mount, and a viewfinder angle-of-view setting mechanism coupled to move in a circumferential direction of the lens barrel. Possible viewfinder interlocking pins, lens drive coupler for transmitting motor driving force for performing AF, etc., camera side electrical connection for transmitting information such as focus information, and for detecting mounting of the lens An interchangeable lens, a spigot ring having a bayonet claw engaged with the bayonet claw engagement portion and an engagement pin engaged with the finder interlocking pin, and a camera-side electric connection portion. A lens-side electrical connection portion to be connected; and a focus ring coupler connected to the lens drive coupler, wherein the interchangeable lens is located forward from a predetermined position. Insert into the mount
This allows the lens-side electrical connection to be
Instead of rotating and sliding on the air connection,
And focus ring coupler
The finder coupling pin is coupled to the lens drive coupler by abutment in the optical axis direction, and by rotating the spigot ring, the engagement pin causes the finder interlocking pin to rotate by an amount corresponding to the focal length of the interchangeable lens. Direction to adjust the magnification of the viewfinder angle setting mechanism, lock the bayonet claw on the bayonet claw locking portion, and
A camera mounting structure characterized by detecting the attachment of an interchangeable lens by operating a lever.