JPH08227096A - Lens attaching/detaching mechanism for lens interchangeable camera - Google Patents

Abstract

PURPOSE: To provide a lens attaching/detaching mechanism where the need of relative initial alignment in the peripheral direction of a camera main body and an interchangeable lens at the time of attaching the interchangeable lens to the camera main body is eliminated and also the interchangeable lens is led to a normal position even if it is rotated in either direction of left or right. CONSTITUTION: This is a lens attaching/detaching mechanism in a lens interchangeable camera where plural interchangeable lenses 25 are selectively attached and used for the camera main body 20. Plural magnets 1 are arranged along the peripheral direction of a seat plate surface 21 on the side of the camera main body 20 in a positional relation where center angles formed between arbitrary two magnets are all different. Also, an attraction member 10 attracted by the magnet 1 is arranged at a position corresponding to respective magnets 1 on the seat plate surface 21 along the peripheral direction of the seat plate 21 on the side of the interchangeable lens 25 in a mirror image relation with respect to the magnet 1 on the seat plate surface 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for attaching and detaching an interchangeable lens and a camera body in an interchangeable lens type camera.

[0002]

2. Description of the Related Art In an interchangeable lens type camera in which a plurality of interchangeable lenses are selectively attached to a camera body and used, for example, a guide groove is provided near a seat plate surface of the camera body and Slidable protrusions are provided near the seat plate surface of each interchangeable lens. When mounting the interchangeable lens on the camera body, engage the convex portion on the interchangeable lens side with the entrance of the guide groove on the camera body side, and rotate the interchangeable lens relative to the camera body to guide the convex portion. By sliding the interchangeable lens in the circumferential direction along the groove and guiding the interchangeable lens to a predetermined normal position, both are mounted.

As described above, in the conventional interchangeable lens type camera, when the interchangeable lens is attached to the camera body, first, the convex portion on the interchangeable lens side is engaged with the guide groove entrance on the camera body side. It is necessary to match the relative initial positions of the main body and the interchangeable lens in the circumferential direction. After engaging the convex part with the entrance of the guide groove, the convex part must be slid along the guide groove to guide the interchangeable lens to the normal position. I have to rotate it. Further, it is often the case that a mark for facilitating the initial alignment between the camera body and the interchangeable lens must be provided on the camera body side and the interchangeable lens side.

As described above, in the conventional interchangeable lens type camera, when the interchangeable lens is attached to the camera body, there are many restrictions on the initial alignment in the circumferential direction of the lens and the operational direction regarding the rotation direction of the lens. There is a problem.

[0005]

Therefore, the technical problem to be solved by the present invention is to eliminate the need for relative initial alignment in the circumferential direction of the interchangeable lens when attaching the interchangeable lens to the camera body, and to replace the interchangeable lens. It is an object of the present invention to provide a lens attaching / detaching mechanism that can guide a lens to a normal position by rotating the lens in either the left or right direction.

[0006]

SUMMARY OF THE INVENTION The present invention is a lens attaching / detaching mechanism in a lens interchangeable camera, in which a plurality of interchangeable lenses are selectively attached to a camera body for use. Further, in order to solve the technical problem, the following features are provided.

That is, a plurality of magnets are arranged along the circumferential direction of the first seat plate surface on the camera body side in a positional relationship in which the central angles formed between any two magnets are all different. Further, along the circumferential direction of the second seat plate surface on the interchangeable lens side, at a position corresponding to each magnet on the first seat plate surface, an attracting member that can be attracted to the magnet is a magnet on the first seat plate surface. Are arranged in a mirror image relationship to.

Further, in the lens attaching / detaching mechanism of the present invention, means for weakening the joining force by the magnetic force between the magnet and the attraction member in at least a part of the plurality of sets of the magnet and the attraction member in the joined state. Is preferably provided.

[0009]

In the lens attaching / detaching mechanism of the present invention configured as described above, the engagement between the camera body and the interchangeable lens is carried out by utilizing the attraction by the magnetic force of the magnet,
The engagement between the guide groove and the convex portion is not used. Therefore, since there is no element that regulates the initial relative position in the circumferential direction when the interchangeable lens is attached to the camera body, the initial alignment for engaging the convex portion with the entrance of the guide groove is unnecessary. As a result, the initial relative position of the interchangeable lens with respect to the camera body in the circumferential direction can be combined without being aligned with a specific position, and the two can be relatively rotated from there to guide the interchangeable lens to the normal position. Moreover, the rotation direction at this time may be left or right. Further, since the initial alignment is unnecessary, it is not necessary to attach a mark indicating the initial relative position to the camera body or the interchangeable lens.

Further, the plurality of magnets arranged on the first seat plate surface on the camera body side are arranged so that the central angles formed by any two of them are different, and further on the interchangeable lens side. The attraction member arranged on the second seat plate surface is arranged in a mirror image relationship with the magnet on the first seat plate surface. Therefore, when both seat plate surfaces are displaced relative to each other in the circumferential direction from an arbitrary position, there is only one relative position of both seat plate surfaces so that all magnets can be joined with the corresponding attracting members. However, at other relative positions, there is no magnet or only one magnet that can be bonded to the corresponding attraction member, and two or more magnets do not bond to the attraction member.
That is, if the relative position where all the magnets can be joined to the attraction member is set to the normal position, the magnetic force of all the magnets can be effectively used to firmly bond the camera body and the interchangeable lens at the normal position. At the relative positions other than the normal position, since the magnetic force of only one magnet can be used at the maximum, the joining force is weak. As a result, when the user rotates the interchangeable lens by hand to guide the interchangeable lens to the normal position, the magnetic force of the magnet pulls the interchangeable lens to the correct position when the interchangeable lens comes close to the correct position. Act on. Then, the user can know that the interchangeable lens is mounted in the normal position by feeling this force in his / her hand through the interchangeable lens.

On the other hand, when a means for weakening the joining force due to the magnetic force between the magnet and the attracting member in a part of the plurality of sets of the magnet and the attracting member in the joined state is provided, The interchangeable lens can be easily removed. In other words, when the interchangeable lens is in the normal position with respect to the camera body, all the magnets are functioning effectively, and in this case, there is a strong joining force that prevents the lens from accidentally falling off during shooting. Has been granted. Then, in order to remove the lens from this state, a force exceeding the strong joining force is required. However, the lens can be removed relatively easily by weakening the magnetic force of a part of all the magnets that function when the lens is removed. However, weakening the magnetic force of all magnets increases the risk of the lens falling at the moment when the magnetic force is weakened, so remove the lens only when the user manually removes the lens. It is effective to weaken the magnetic force of only some magnets so that

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1A and 1B show an interchangeable lens 25 and a camera body 20. Four magnet blocks 1 are embedded in the seat plate surface 21 of the camera body 20.
The embedding method is insert molding, digging press-fitting, digging adhesion, or the like. On the other hand, four keepers (suction pieces) 10 are embedded in the seat plate surface 26 of the interchangeable lens 25. The embedding method in this case is the same as in the case of the camera body. In addition, FIG. 1C shows an interchangeable lens 25 for the camera body 20.
FIG. 4 is a cross-sectional view of a main part for explaining attachment of the. The seat plate surface 26 of the interchangeable lens 25 is brought into contact with the seat plate surface 21 of the camera main body 20, and both are relatively rotated to join each magnet block 1 and each keeper 10 when they come to corresponding positions. To do.

FIG. 2 shows a magnet block 1 and a keeper.
10 and 10 are joined by magnetic force. The magnet block 1 is configured by sandwiching both sides of a flat magnet 2 with yokes 3. The flat magnet 2 has an N pole on one surface and an S pole on the other surface. In the state where the magnet block 1 and the keeper 10 are joined, a gap 4 is formed between the magnet 2 and the keeper 10, and as a result, a magnetic circuit passing through the magnet 2, the yoke 3 and the keeper 10 is formed. Although FIG. 2A shows a rectangular parallelepiped magnet block 1, the shape of the magnet block 1 may be a rectangular parallelepiped, a cube, an elliptic cylinder, a cylindrical cylinder, or the like. . FIG. 2B shows an elliptic magnet block.

In recent lenses, since electrical signals may be exchanged between the camera and the lens, when the interchangeable lens is actually attached to the camera body, the relative position between the two is correct (normal position). Need to be adjusted exactly. That is, the interchangeable lens 25 is firmly attracted to the camera body 20 only in the positive position to prevent further relative rotation between the two, and in other cases, the relative position of the interchangeable lens 25 to the camera body 20 is fixed. It is necessary to prevent it being done. A structure for accomplishing this is shown in FIG.

FIG. 3A shows a seat plate surface 2 of the camera body 20 of FIG.
1 is an enlarged view of 1, in which four magnet blocks arranged along the circumferential direction are shown by 11, 12, 13, and 14, respectively. Magnet blocks 11 and 12, 12 and 13, 13 and 1
The central angles formed by 4, 14 and 11 are 80 °, 85 ° and 100, respectively.
The angle of the central angle formed between the two magnet blocks is different, no matter which two magnet blocks are taken out. Also, on the seat plate surface 26 of the interchangeable lens 25, four keepers 10 are provided on each magnet block 1
It is arranged in a mirror image relationship at positions corresponding to 1, 12, 13, and 14. Therefore, there is only one relative position between the camera body 20 and the interchangeable lens 25 so that all four magnet blocks can be joined to the corresponding keepers on the interchangeable lens side. Then, such a relative position is set as a normal position. In other words, the interchangeable lens 25 uses the magnetic force of all the magnet blocks only in the positive position
It is strongly adsorbed to 20, and further relative rotation is prohibited. In other cases, since there is no magnet block or only one magnet block to be joined to the keeper, the attracting force is weak, and it is easy to further rotate the interchangeable lens 25 to the normal position.

In FIG. 3A, a lock pin 18 for locking the camera body 20 and the interchangeable lens 25 in the normal position is provided on the seat plate surface 21 of the camera body 20. The lock pin 18 has a known structure and is normally urged by a spring or the like so as to project from the seat plate surface 21. When the camera body and the interchangeable lens are brought into contact with each other, they are pushed in by the lens-side seat plate surface 26. However, when the camera body and the interchangeable lens rotate relative to each other and come to the normal position, the lock pin projects and engages into a recess (not shown) provided on the interchangeable lens side. This allows
The lock is performed in the normal position. If such a lock pin is provided, the relative rotation between the camera body and the interchangeable lens is prohibited by the lock pin in addition to the attraction force of the magnet. Further, the user can know that the interchangeable lens is mounted at the normal position not only by the attractive force of the magnet felt by the hand but also by the sound and vibration when the lock pin is projectingly engaged.

In the above embodiments, the magnet block and the keeper are provided on the seat plate surface of each of the camera body 20 and the interchangeable lens 25, but the seat plate surface itself may be configured as a magnet. That is, FIG.
As shown in (b), the seat plate surface 21 itself on the camera body 20 side is made of a magnet, and the S pole portions and the N pole portions are alternately arranged along the peripheral surface. And the seat plate surface 26 on the side of the interchangeable lens 25 is also
The magnet itself is formed, and the N pole portions and the S pole portions are alternately arranged so as to correspond to the S pole portions and the N pole portions on the seat plate surface 21 on the camera body 20 side. For the same reason that the central angles between the magnet blocks are all different when the magnet blocks are adopted, the magnetized ranges are not evenly distributed in this case as well. That is, in this case, the seat plate surfaces 21 and 26 have a plurality of boundary portions between the S pole portion and the N pole portion along the circumferential direction, but they are formed between any two boundary portions. The arc lengths of the S-pole part and the N-pole part are determined so that all the central angles are different. When such a configuration is adopted, except when the camera body 20 and the interchangeable lens 25 are in the normal positions, a repulsive force between the same magnetic forces is generated at any place on the seat plate surface, so that the user Feels this power in his hand. Then, when the camera body 20 and the interchangeable lens 25 come to the normal position, this repulsive force disappears at all, and the camera body 20 and the interchangeable lens 25 are joined. Thus, the repulsive force at positions other than the normal position also functions as a guide and guide to the normal position.

The interchangeable lens is attached to the camera body with a very strong magnetic force so as not to come off during photographing. Therefore, if the magnetic force can be weakened when the lens is replaced, the lens can be easily removed.

One method for this is to attach an electromagnet and a yoke that can be excited when necessary, to the keeper on the interchangeable lens side. In such a state that the keeper and the magnet block on the camera body side are slightly separated from each other, as shown in FIG.
Is shown in. FIG. 4 is an enlarged view of the portion shown in FIG. An electromagnet 17 and yokes 16 arranged on both sides thereof are attached to the keeper 10 shown in FIG. 1 (c). Electromagnet 17 is normally not excited,
Therefore, when the magnet block 1 and the keeper 10 are in a joined state, a magnetic circuit that passes through the magnet 2, the yoke 3, and the keeper 10 is formed.

When a lock release button (not shown) provided on the camera body side is pressed, the electromagnet 17 is excited and a magnetic field is generated which cancels the magnetic circuit formed by the magnet block 1 and the keeper 10. As a result, the joining force between the magnet block 1 and the keeper 10 is weakened, and the interchangeable lens 25 can be easily removed from the camera body 20. The electromagnet 17 is not attached to all keepers, but to some of all keepers. Therefore, even if the lock release button is pressed, the keeper that does not have the electromagnet 17 does not weaken the joining force to the magnet block 1 on the camera body side.
As a result, it is possible to prevent the interchangeable lens from dropping unexpectedly when the lock release button is pressed. In other words, if you do not press the lock release button, you cannot easily remove the interchangeable lens because all the keeper and magnet blocks are joined, but if you press the lock release button, some keeper will stick to the magnet block. The power becomes weak. As a result, the attraction force of the interchangeable lens with respect to the camera body is strong enough to easily remove the interchangeable lens by hand, but to prevent it from falling naturally.

FIG. 5 is a circuit block diagram for explaining the mechanism for adjusting the magnetic force described above. E is the power supply, Sp
Is a power switch for supplying electric power from the camera body side to the lens side, control Ca is a control circuit on the camera body side, control Le is a control circuit on the interchangeable lens side, and Mg is an electromagnet. Further, S _LL is a lens lock switch that is turned on when the lens is attached, and S _LR is a lens lock release switch that is turned on when the lock release button is pressed. In the figure, A _{1 to} A ₃ indicate contacts, the circuit on the left side of each contact indicates a portion formed on the interchangeable lens side, and the circuit on the right side indicates a portion formed on the camera body side. These two circuits are connected at the contacts A ₁ , A ₂ and A ₃ when the interchangeable lens comes to the normal position with respect to the camera body. That is, FIG. 5 shows a circuit diagram when the interchangeable lens is in the normal position.

When the interchangeable lens is mounted in the normal position with respect to the camera body, the contacts A _{1 to} A ₃ come into contact with each other and the lens lock switch S _LL is turned on. This is the control circuit Ca
When it is detected, the power switch Sp is turned on to supply power to the lens side control circuit Le, and the lens side control such as excitation of the electromagnet 17 is enabled.

When replacing the lens, the lens lock release switch S _LR is pressed. When the control circuit Ca detects this, the control circuit Ca sends a signal indicating this to the control circuit Le. Upon receiving this signal, the control circuit Le excites the electromagnet Mg. When the electromagnet Mg is excited, as described above, a magnetic field that cancels the magnetic field of the magnet block on the camera body side is generated, and the bonding force between the camera body and the interchangeable lens becomes small. When the lens is removed in this state, contact A ₁
As A ₃ is separated, the lens lock switch S _LL is turned off, and the control circuit Ca turns off the power switch Sp. In this way, the power supply to the electromagnet on the lens side is cut off.

Another method for weakening the joining force between the lens and the camera body when removing the interchangeable lens is as follows.
A material such as a soft magnetic material having a larger magnetic permeability than the keeper 10,
It is conceivable to insert it into the gap 4 between the magnet block 1 and the keeper 10 to short-circuit the closed magnetic circuit. That is, when nothing is inserted into the gap 4, a magnetic circuit that passes through the magnet 2, the yoke 3, and the keeper 10 is formed, but by inserting a material having a higher magnetic permeability into the gap 4, A magnetic circuit is formed through the magnet 2, the yoke 3, and the inserted material,
As a result, the joining force between the magnet block 1 and the keeper 10 is weakened. The configuration for this is shown in FIG. 30 is a body mount and 40 is a lock release lever, and is a perspective view of a main part as seen from the inner surface side of the camera body. That is, the surface on the other side of the body mount 30 which is not shown in FIG. 6 is the seat plate surface 21 shown in FIG. Further, FIG. 7 is a camera body viewed from the direction of arrow A in FIG.
20 is a schematic view of a main part of 20 front faces.

FIG. 6 is an exploded view. At the time of assembly, the small diameter portion 31 of the body mount 30 is inserted into the central opening 45 of the lock release ring 40, and the soft magnetic body 42 attached to the lock release ring 40. The washer 70 is inserted into the slot 32 of the body mount 30 to prevent the soft magnetic body 42 from coming off the body mount 30 (see FIG. 8 and omitted in FIG. 6 for the sake of clarity). Etc. At this time, the soft magnetic body 42 is fixed so as to be rotatable relative to the body mount 30. 8 (l), (m), and (n) show the body mount 30 and the lock release ring after assembly, respectively.
40 is shown in each cross-sectional view taken along the lines l, m, and n in FIG. The unlocking ring 40 is normally biased in the X direction shown in FIG. 6, but moves in the Y direction when the unlocking button 60 is pressed, as will be described later. Also body mount 30
The magnet block 1 described above is embedded in a portion corresponding to the line n in the inside. 8 (l) and 8 (m), the unlocking ring 40 is biased in the X direction,
In FIG. 8 (n), a cross-sectional view is drawn with the unlocking ring 40 biased in the Y direction (that is, with the soft magnetic body 42 inserted in the gap 4).

When removing the interchangeable lens, the camera body
When the lock release button 60 provided on the lock release button 60 is pressed, the taper portion 61 of the lock release button 60 is moved to the edge of the lock release lever 50.
Upon contact with 51, the lock release lever 50 rotates about the shaft 52 in the direction of arrow Z in FIG. Unlock lever 50
When is rotated in the Z direction, the pin 41 provided on the lock release ring 40 slides in the long hole portion 53 formed in the lock release lever 50, and the lock release ring 40 moves in the arrow Y direction. Then, the soft magnetic body 42 moves in the direction of arrow B in FIG. 7 relative to the body mount 30, and is inserted into the gap 4 between the two yokes of the magnet block 1.

Although only the two magnet blocks 1 into which the soft magnetic material 42 is inserted are drawn on the seat plate surface 21 of the camera body 20 shown in FIG. 7, the soft magnetic material 42 is actually inserted. There is also a magnet block 1 that is never played.
Illustration of these magnet blocks is omitted. The arrangement of the magnet blocks 1 on the seat plate surface 21 is as described above with reference to FIG.

As described above, when the lock release button is pressed when the interchangeable lens 25 is detached, the joining force of a part of the keeper to the magnet block is weakened. As a result, the joining force of the interchangeable lens with respect to the camera body is strong enough to easily remove the interchangeable lens by hand, but to prevent it from falling naturally, as in the case of using the electromagnet 17. It becomes

An interchangeable lens 25 for the camera body 20
Depending on the joining force, that is, the set value of the magnetic force of the magnet block, it may not be necessary to reduce the magnetic force of some of the magnet blocks. That is, since the magnet has a characteristic that its magnetic force is strong against the pulling force but weak against the shearing force, the camera body 20 and the interchangeable lens 25
The interchangeable lens can be removed only by rotating and relatively. And, when the lock pin 18 is provided, in conjunction with the lock release button,
The lock pin 18 may be housed inside the camera body 20 from the protruding position.

In the present invention, the magnetic force of the magnet is used to join the camera body and the interchangeable lens. However, in general, the magnetic force of a magnet becomes weaker with time if left without a magnetic circuit formed, so in order to prevent such a decrease in magnetic force with time,
It is desirable to always keep the magnetic circuit formed.

In the embodiment in which the soft magnetic material 42 is inserted into the gap 4 of the magnet block 1 to weaken the joining force as described with reference to FIGS. 6 to 8, while the lens is removed,
If the soft magnetic body 42 is always locked in the gap 4, the magnetic force of the magnet block can be prevented from decreasing.
This can be easily achieved by providing a stop lever (not shown). This stop lever is released by pressing the lock release button 60.
When the soft magnetic body 42 is rotated and the soft magnetic body 42 is inserted into the gap 4, the lock release lever 50 is locked in that position (that is,
The soft magnetic body 42 attached to the lock release ring 40 is locked in the gap 4). And this stop lever will be
The lock release lever 50 is unlocked in conjunction with the mounting operation to allow the soft magnetic body 42 to be pulled out from the gap 4.

If the above-mentioned structure is adopted, a magnetic circuit is always formed in the magnet block regardless of whether the interchangeable lens is attached or not. Can be prevented. When the structure for inserting the soft magnetic body 42 into the gap 4 is not used as the unlocking mechanism, the body cap is made of a soft magnetic material having a high magnetic permeability, and the body cap is used when the lens is not attached. If the cap is always attached, it is possible to prevent the magnetic force of the magnet block from decreasing.

In the present invention, the magnet block 1 is provided on the seat plate surface 21 on the camera body 20 side and the keeper 10 is provided on the seat plate surface 26 on the interchangeable lens 25 side for the following reason.

The interchangeable lens type camera has a plurality of interchangeable lenses with respect to the camera body, and any interchangeable lens or cap is attached to the camera body during transportation or storage other than photographing. . That is, the seat plate surface 21 on the camera body 20 side is hardly exposed to the outside. On the other hand, as for the interchangeable lens, the seat plate surface 26 is often exposed except for the one mounted on the main body. Therefore, replace the magnet block 1 with the interchangeable lens 25.
If mounted on the side, sand iron or the like will adhere to the magnet block 1 when the seat plate surface 26 is exposed, and the joining force of the interchangeable lens with respect to the camera body will be weakened. However, if the magnet block 1 is attached to the camera body 20 side,
Since the seat plate surface 21 is rarely exposed, such a problem is unlikely to occur. Considering that the cost of the magnet block is higher than that of the keeper, it is more economical to provide the magnet block in one camera body than to provide the magnet block for many interchangeable lenses.

By thus providing the magnet block 1 on the camera body 20 side, the adhesion of sand iron or the like is prevented as much as possible, but due to the nature of the magnet, it is impossible to completely prevent the adhesion of sand iron or the like. . Therefore, as shown in FIG. 9, on the seat plate surface 26 on the side of the interchangeable lens 25, or the camera body 2
It is preferable to provide a groove 75 on the seat plate surface 21 on the 0 side. When the camera body 20 and the interchangeable lens 25 rotate relative to each other with the seat plate surfaces 21 and 26 in contact with each other, sand iron, dust, and the like between them are scraped in the groove 75. As a result, it is possible to prevent the joining force between the camera body 20 and the interchangeable lens 25 from being weakened.

[Brief description of drawings]

FIG. 1 is a schematic diagram illustrating an interchangeable lens camera according to the present invention. 1A shows an interchangeable lens, FIG. 1B shows a camera body, and FIG. 1C shows attachment of the interchangeable lens to the camera body.

FIG. 2 is a perspective view showing a magnet block according to the present invention. FIG. 2A shows a rectangular parallelepiped magnet block, and FIG. 2B shows an elliptic magnet block.

FIG. 3 is an enlarged view of a seat plate surface of the camera body according to the present invention. FIG. 3A shows a case where a magnet block is used, and FIG. 3B shows a case where the seat plate surface itself is made of a magnet.

FIG. 4 is a cross-sectional view of essential parts for explaining an embodiment in which an electromagnet is attached to the keeper to weaken the joining force between the magnet block and the keeper.

5 is a control circuit block diagram in the embodiment shown in FIG. 4. FIG.

FIG. 6 is a perspective view of relevant parts for explaining an embodiment in which a joining force between a magnet block and a keeper is weakened by using a soft magnetic material.

7 is a schematic view of the front of the camera body viewed from the direction of arrow A in FIG.

FIG. 8 is a sectional view taken along lines l, m, and n of FIG.

FIG. 9 is a schematic perspective view showing an embodiment in which a groove for scraping sand iron or the like between a magnet block and a keeper is formed on a seat plate surface on the side of an interchangeable lens.

[Explanation of symbols]

 1 magnet block 2 magnet 3 yoke 4 gap 10 keeper 11, 12, 13, 14 magnet block 16 yoke 17 electromagnet 18 lock pin 20 camera body 21 seat plate surface 25 interchangeable lens 26 seat plate surface 30 body mount 31 small diameter part 32 long hole 40 Lock release ring 41 Pin 42 Soft magnetic material 45 Central opening 50 Lock release lever 51 One edge of lock release lever 52 Shaft 53 Slot 60 Lock release button 61 Tapered part 70 Lock washer 75 Groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toyonori Kawasaki 2-3-13 Azuchi-cho, Chuo-ku, Osaka-shi, Osaka Prefecture Minamita Co., Ltd. (72) Masaaki Miyano Azuchi-cho, Chuo-ku, Osaka-shi, Osaka 2-3-13 Osaka International Building Minolta Co., Ltd. (72) Inventor Hidehiko Fujii 2-33 Azuchi-cho, Chuo-ku, Osaka City, Osaka Prefecture Osaka International Building Minolta Co. (72) Inventor Hisato Ito Osaka Prefecture 2-13-3 Azuchicho, Chuo-ku, Osaka City Minolta Co., Ltd. Osaka International Building (72) Inventor Kenji Mizumoto 2-3-3 Azuchi-cho, Chuo-ku, Osaka City, Osaka City Minato International Building Co., Ltd.

Claims (2)

[Claims] 1. A lens attaching / detaching mechanism in an interchangeable lens type camera, wherein a plurality of interchangeable lenses (25) are selectively attached to a camera body (20) and used, wherein the first seat on the camera body (20) side. A plurality of magnets (1) are arranged along the circumferential direction of the plate surface (21) such that the central angles formed between any two magnets (1) are all different from each other, and the interchangeable lens (25) Along the circumferential direction of the second side seat plate surface (26),
At the position corresponding to each magnet (1) on the first seat plate surface (21), the attracting member (10) that can be attracted by the magnet (1) has a magnet (1) on the first seat plate surface (21). A mechanism characterized by being arranged in a mirror image relationship with respect to. 2. A plurality of sets of the magnets in a joined state
A means (17, 42) for weakening the joining force by the magnetic force between the magnet (1) and the attraction member (10) in at least a part of the set (1) and the attraction member (10) is provided. The lens attaching / detaching mechanism according to claim 1, which is characterized in that.