JP2002006383A - Lens device, camera and photographing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that the feeling of backlash is given because sliding force exceeding sliding resistance force is generated at a mount coupling part between a camera and a lens device. SOLUTION: In this lens device equipped with a lens side mount part 3 attachably/detachably coupled with a camera side mount part provided in the camera 1, a member 4 having a higher static friction coefficient than the surface of the lens side mount part is provided on the bonding surface 3a of the lens side mount part with the camera side mount part or working such as surface treatment to make the static friction coefficient higher than the surface of the lens side mount part is performed to the surface 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for making a lens device detachable from a camera such as a video camera.

[0002]

2. Description of the Related Art Some video cameras have a detachable lens device such as a zoom lens. FIGS. 10 and 11 show an operation mode of such a portable video camera.

[0003] A mount ring 103 is provided on the front of the video camera 101.
3, a zoom lens 102 is detachably mounted via a mount 110 (see FIG. 11).

On the side of the main body of the zoom lens 102, there is provided a drive unit 104 containing a motor and a circuit for electrically controlling the iris operation and the zoom operation of the zoom lens 102.
A belt 105 that sandwiches the back of the photographer's hand that holds the drive unit 104 is provided on the outer periphery of the drive unit 104.

At the time of video shooting, the photographer carries the video camera 101 on the shoulder via the shoulder pad 106 and supports the drive unit 104 of the zoom lens 102 with the right hand.

By the way, in a broadcast class video camera, the video camera 101 and the zoom lens 102 are formed in an easily detachable structure, and a so-called bayonet type mounting structure is adopted so that various types of lenses can be easily replaced. are doing.

FIGS. 12 to 14 show a general bayonet type mounting structure. FIG. 12 shows a cross section of a main part of a zoom lens 102 mounted on the front of a video camera 101. FIG. 13 is a view of the joining surface between the flange surface 101a of the video camera 101 and the flange surface 107a of the zoom lens 102 in FIG. FIG. 14 shows the video camera 10 in FIG.
FIG. 3 is a view of a joint surface between a flange surface 101a of the zoom lens 102 and a flange surface 107a of a zoom lens 102 viewed from a direction B.

The zoom lens 102 has a male bayonet 1
07 is provided, and a rotation positioning pin 108 is provided at one position on the flange surface 107a.

On the other hand, a mount ring 103 screwed with screws 103a is provided on the front surface of the video camera 101, and a positioning groove 109 is formed at one position on the inner diameter side of the mount ring 103.

The zoom lens 102 is a video camera 101
Inserted in front of At this time, the rotation positioning pin 108
Is fitted into the positioning groove 109 and the zoom lens 10 is
2 is blocked. And the mount ring 103
Can be contracted with the male bayonet 107 on the zoom lens 102 side in a state where both flange surfaces 101a and 107a are joined. Thus, the video camera 101 holds the zoom lens 102.

[0011]

SUMMARY OF THE INVENTION Mount ring 103
Is tightened, the force acting in the direction perpendicular to the flange surface 107a by tightening the mount ring 103 is No, and the diameter of the average joint surface of the flange surface 107a is D.
o, assuming that the static friction coefficient between the flange surfaces 101a and 107a is μ0, a relational expression representing the slip resistance Fo of the flange surface is as follows: F0 = μ0 · N0 · D0 (a)

In a general photographing state, the zoom lens 102
There is no problem in the operation and performance of the zoom lens 102.
When the entire video camera 101 and zoom lens 102 are lifted off the shoulders or abrupt pan / tilt operations are repeated simply by gripping the drive unit 104, the sliding resistance force F of the flange surface is obtained. May occur.

A video camera 101 and a zoom lens 102
There is a slight fitting gap α0 at the radial fitting location that determines the optical fiber, and a fitting gap β0 also exists between the rotary positioning pin 108 and the inner surface of the positioning groove 109. For this reason, when the above operation is performed, a rattling phenomenon occurs in the direction orthogonal to the optical axis of the zoom lens 102 or in the rotation direction, which may hinder the operation of the cameraman.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lens device and a camera having a mounting structure capable of obtaining a strong mount coupling force between the lens device and the camera without impairing the ease of attachment and detachment. .

[0015]

In order to achieve the above object, according to a first aspect of the present invention, there is provided a lens having a lens-side mount portion detachably connected to a camera-side mount portion provided in a camera. In the device, a member having a higher static friction coefficient than the surface of the lens-side mount portion is provided on a joint surface of the lens-side mount portion with the camera-side mount portion, or the static friction coefficient is higher than the surface of the lens-side mount portion. Processing such as surface treatment is given.

According to the second aspect of the present invention, in a camera having a camera-side mount portion to which a lens-side mount portion provided in a lens device is detachably connected, the camera-side mount portion and the lens-side mount portion are connected to each other. On the joint surface,
A member having a higher static friction coefficient than the surface of the camera-side mount portion is provided, or a process such as a surface treatment is performed so that the static friction coefficient is higher than the surface of the camera-side mount portion.

According to the first and second aspects of the present invention, the slip obtained when the surfaces of the lens-side mount portion and the camera-side mount portion are joined (contacted) as they are while the mount connecting operation is made easy as before. Slip resistance greater than resistance can be obtained. For this reason, even when, for example, the entire lens device and camera are lifted off the shoulder or abrupt pan / tilt operations are repeated, the coupling in the optical axis orthogonal direction and the rotation direction between both mount portions is not possible. A strong mount coupling force capable of preventing rattling can be obtained.

By using an elastic member as a member having a high coefficient of static friction, a large mounting surface pressure (that is, a sliding resistance friction) can be generated by a compressive force of the elastic member, and a more rigid force can be obtained. It is possible to obtain a mount coupling force.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS. 1 to 3 show the configuration of a mount connecting portion in a photographing system according to a first embodiment of the present invention.

FIG. 1 shows a state of the mount connecting portion in a state where the zoom lens 2 is mounted on the front mounting portion of the video camera 1. FIG. 2 is a view of the joining surface between the flange surface 1a of the video camera 1 and the flange surface 3a of the zoom lens 2 as viewed from the direction A in FIG. 1, and FIG. FIG.

The zoom lens 2 is provided with a male bayonet (lens-side mount portion) 3 and its flange surface 3a has a required surface roughness over substantially the entire circumference (at least a surface roughness greater than the surface of the flange surface 3a). ) Is fixed. Further, a rotation positioning pin 5 is provided at one position of the flange surface 3a.

On the other hand, a female bayonet portion (camera-side mount portion) provided on the front surface of the video camera 1 is constituted by a mounting ring 6 screwing a screw 6a on the inner diameter side thereof into a screw formed on the camera 1. Have been. At one location on the inner diameter side of the mount ring 6, a positioning groove 7 is provided.
Are formed.

When the zoom lens 2 is mounted on the video camera 1, the male bayonet 3 of the zoom lens 2 is inserted into the female bayonet of the video camera 1. At this time, the rotation positioning pin 5 is fitted and inserted into the positioning groove 7, so that the rotation of the zoom lens 2 with respect to the video camera 1 is prevented.

Then, the mount ring 6 is tightened,
Flange surface (joint surface) 3a of male bayonet 3 of zoom lens 2 and flange surface (joint surface) 1a of TV camera 1
Are joined while compressing the elastic member 4. This allows the video camera 1 to hold the zoom lens 2.

Here, in the flange joint portion in the flange-joined state as described above, a force acting in a direction perpendicular to the flange surface 3a by tightening the mount ring 6 is provided on the flange surface 3a by N1 (> N0). The average diameter of the joining surface of the elastic member 4 is D1 (= D0), and the flange surface 1
Assuming that the coefficient of static friction between a and the elastic member 4 is μ1 (> μ0), the relational expression representing the slip resistance of the flange surface is as follows: F1 = μ1 · N1 · D1 (> F0) (b) .

As described above, the force N acting on the flange surface in the direction perpendicular to the flange surface is increased by the force required for compressing the elastic member 4 and the flange surface 3a of the elastic member 4 as compared with the conventional mount connection structure. By increasing the coefficient of static friction μ due to the rougher surface roughness, it is possible to increase the slip resistance F at the mount joint.

Therefore, the video camera 1 and the zoom lens 2 can be mounted and connected more firmly than before, and the video camera 1 and the zoom lens 2 can be attached to the video camera 1 and the zoom lens 2 in various directions (the direction orthogonal to the optical axis and the rotation direction) and the size. Even if a strong force acts, the joint play between the video camera 1 and the zoom lens 2 can be prevented.

In the present embodiment, the fitting gap α1 in the direction perpendicular to the optical axis in the fitting portion for determining the optical axis of the video camera 1 and the zoom lens 2 and the rotational direction of the rotation positioning pin 5 and the positioning groove 7 in the rotation direction. The fitting gap β1 is not different from that of the conventional mount joint. Therefore, video camera 1
This does not impair the ease with which the zoom lens 2 can be attached and detached.

(Second Embodiment) FIG. 4 shows a second embodiment of the present invention.
2 illustrates a configuration of a mount coupling unit in the imaging system according to the embodiment.

The basic components of the video camera and the zoom lens are the same as those of the first embodiment, and the same reference numerals are used for the same components as those of the first embodiment.

FIG. 4 shows the flange surface 1a of the video camera 1 and the flange surface 3a of the zoom lens 2 when the zoom lens 2 is mounted on the front mount of the video camera 1.
FIG. 2 is a view of a joint surface between the camera and the camera as viewed from the camera side (A direction in FIG. 1).

In the first embodiment, the elastic member is fixed over substantially the entire circumference of the flange surface 3a of the male bayonet 3 of the zoom lens 2. In the present embodiment, the elastic members are fixed at substantially equal intervals in the circumferential direction on the flange surface 3a. An elastic member 8 having a required surface roughness (at least a surface roughness greater than the surface of the flange surface 3a) is fixed to the location. The elastic member 8 fixed to the vicinity of the rotation positioning pin 5 is divided and fixed to both sides of the rotation positioning pin 5.

In the present embodiment, as in the first embodiment, the force N acting in the direction perpendicular to the flange surface increases by the force required for compressing the elastic member 8 as compared with the conventional mount connection structure. And the flange surface 3a of the elastic member 8
By increasing the coefficient of static friction μ due to the rougher surface roughness, it is possible to increase the slip resistance F at the mount joint.

Therefore, the video camera 1 and the zoom lens 2 can be more securely mounted and connected to each other than before, and the video camera 1 and the zoom lens 2 can be mounted in various directions (the direction orthogonal to the optical axis and the rotation direction) and the size. Even if a strong force acts, the joint play between the video camera 1 and the zoom lens 2 can be prevented.

In the present embodiment, a fitting gap in the direction orthogonal to the optical axis in the fitting portion for determining the optical axis of the video camera 1 and the zoom lens 2 and the fitting in the rotational direction between the rotary positioning pin 5 and the positioning groove 7. The mating gap is no different from the conventional mount joint. For this reason, the ease with which the zoom lens 2 can be attached to and detached from the video camera 1 is not impaired.

(Third Embodiment) FIG. 5 shows a third embodiment of the present invention.
2 illustrates a configuration of a mount coupling unit in the imaging system according to the embodiment.

The basic components of the video camera and the zoom lens are the same as those of the first embodiment, and the same reference numerals are used for the same components as those of the first embodiment.

FIG. 5 shows the flange surface 1a of the video camera 1 and the flange surface 3a of the zoom lens 2 when the zoom lens 2 is mounted on the front mount of the video camera 1.
FIG. 2 is a view of a bonding surface with the lens device viewed from a lens device side (a direction B in FIG. 1).

In the first and second embodiments, the case where the elastic members 4 and 8 are fixed to the flange surface 3a of the zoom lens 2 has been described.
The elastic members 9 are fixed to three regions (a total of six locations) of the flange surface 1a at substantially equal intervals in the circumferential direction.

In the present embodiment, similarly to the first embodiment, the force N acting in the direction perpendicular to the flange surface increases by the amount of force required for compressing the elastic member 9 as compared with the conventional mount connection structure. And the flange surface 1a of the elastic member 9
By increasing the coefficient of static friction μ due to the rougher surface roughness, it is possible to increase the slip resistance F at the mount joint.

Therefore, the video camera 1 and the zoom lens 2 can be mounted and connected more firmly than before, and the video camera 1 and the zoom lens 2 can be mounted in various directions (optical axis orthogonal direction and rotation direction) and sizes. Even if a strong force acts, the joint play between the video camera 1 and the zoom lens 2 can be prevented.

In the present embodiment, a fitting gap in the direction orthogonal to the optical axis in the fitting portion for determining the optical axis of the video camera 1 and the zoom lens 2 and a fitting in the rotating direction between the rotary positioning pin 5 and the positioning groove 7. The mating gap is no different from the conventional mount joint. For this reason, the ease with which the zoom lens 2 can be attached to and detached from the video camera 1 is not impaired.

In the first to third embodiments, the case where the elastic members 4, 8, and 9 having a high static friction coefficient are provided only on one of the video lens 1 side and the zoom lens 2 side has been described. Lens 1 side and zoom lens 2
May be provided on both sides.

In the first to third embodiments, the case where the elastic members 4, 8, and 9 are used as members having a high static friction coefficient has been described. However, a member having a high static friction coefficient other than the elastic member is used. You may.

(Fourth Embodiment) FIGS. 6 to 8 show the configuration of a mount connecting portion in a photographing system according to a fourth embodiment of the present invention.

FIG. 6 shows a state of the mount connecting portion in a state where the zoom lens 11 is mounted on the front mount portion of the video camera 10. FIG. 7 is a view of the joining surface between the flange surface 11a of the video camera 10 and the flange surface 13a of the zoom lens 12, viewed from the direction A in FIG.
FIG. 8 is a view of the joining surface viewed from the direction B in FIG.

The zoom lens 11 is provided with an male bayonet (lens side mount) 12. In addition, a rotation positioning pin 15 is attached to one position of the flange surface 12 a of the male bayonet 12.

On the other hand, a female bayonet portion (camera-side mount portion) provided on the front surface of the video camera 10 is constructed by mounting a screw 16a on the inner diameter side of the mount ring 16 with a screw formed on the camera 10. Have been. A positioning groove 17 is formed at one location on the inner diameter side of the mount ring 16.

When the zoom lens 11 is mounted on the video camera 10, the male bayonet 12 of the zoom lens 11 is inserted into the female bayonet of the video camera 10. At this time, since the rotation positioning pin 15 is fitted and inserted into the positioning groove 17, the rotation of the zoom lens 11 with respect to the video camera 10 is prevented.

Then, by tightening the mount ring 16, the flange surface 12 a of the male bayonet 12 of the zoom lens 11 and the flange surface 10
a and bonding surfaces 13 and 14 to be described later are bonded together. This allows the video camera 10 to hold the zoom lens 11.

In the combination of the video camera 10 and the zoom lens 11, a specific flange back is determined by the flange surface 10a of the video camera 10 and the flange surface 12a of the male bayonet 12 provided on the zoom lens 11.

In this embodiment, the flange surfaces 10a, 12a
a at a position deviated by γ in a direction perpendicular to these flange surfaces from the a.
And the joining surfaces 14 of the male bayonet 12 are provided at a plurality of positions in the circumferential direction, and the joining surfaces 13 and 14 are subjected to a surface treatment such as a blast treatment or a satin finish to increase the static friction coefficient as compared with the flange surfaces 10a and 12a. I am giving.

That is, due to the effect of increasing the friction when the joining surfaces 13 and 14 come into contact with each other, μ1 in the relational expression (b) of the slip resistance due to the static friction is increased, and the video camera 10 and the zoom lens 11 are mounted on the mount lens. The power to do is increasing.

Therefore, the video camera 1 and the zoom lens 2 can be more securely mounted and connected than before, and the video camera 1 and the zoom lens 2 can be mounted in various directions (optical axis orthogonal direction and rotation direction) and sizes. Even if a strong force acts, the joint play between the video camera 1 and the zoom lens 2 can be prevented.

In the present embodiment, the fitting gap in the fitting direction for determining the optical axis of the video camera 10 and the zoom lens 11 in the direction perpendicular to the optical axis, and the fitting of the rotary positioning pin 5 and the positioning groove 7 in the rotating direction. The mating gap is no different from the conventional mount joint. For this reason, the ease with which the zoom lens 11 is attached to and detached from the video camera 10 is not impaired.

In this embodiment, the video camera 10
Although the description has been given of the case where the surface treatment is performed on both the bonding surface 13 and the bonding surface 14 of the male bayonet 12, the surface treatment may be performed on only one of the bonding surfaces.

(Fifth Embodiment) FIG. 9 shows a fifth embodiment of the present invention.
2 illustrates a configuration of a mount coupling unit in the imaging system according to the embodiment.

The basic components of the video camera and the zoom lens are the same as those of the fourth embodiment, and the same reference numerals are used for the same components as those of the fourth embodiment.

FIG. 9 shows the flange surface 1a of the video camera 1 and the flange surface 3a of the zoom lens 2 when the zoom lens 2 is mounted on the front mount of the video camera 1.
FIG. 7 is a view of the joining surface with the camera viewed from the camera side (A direction in FIG. 6).

The male bayonet 15 of the zoom lens 11 according to the present embodiment is formed with fine radial grooves 16 on its flange surface 15a, and the coefficient of static friction is increased by the surface roughness of the radial grooves 16. Video camera 10
The mount coupling force between the zoom lens and the zoom lens 11 can be increased.

Therefore, the video camera 10 and the zoom lens 11 can be more firmly mounted and connected than before, and the video camera 10 and the zoom lens 11 can be mounted in various directions (optical axis orthogonal direction and rotation direction) and sizes. Even if a strong force acts, it is possible to prevent the video camera 10 and the zoom lens 11 from rattling.

In the present embodiment, a fitting gap in the direction orthogonal to the optical axis in the fitting portion for determining the optical axis of the video camera 10 and the zoom lens 11 and the fitting in the rotational direction between the rotary positioning pin 5 and the positioning groove 7. The mating gap is no different from the conventional mount joint. For this reason, the ease with which the zoom lens 11 is attached to and detached from the video camera 10 is not impaired.

In this embodiment, the zoom lens 11
The case where the radiation groove 16 is formed only on the flange surface 15a of the video camera 10 has been described.
The radiation groove may be formed only in the groove a, or the radiation groove may be formed in both flange surfaces 10a and 15a. Further, it may be formed over substantially the entire circumference of the flange portion, or may be formed at a plurality of positions in the circumferential direction.

Further, in each of the above embodiments, the television photographing system has been described. However, the present invention can be applied to a general photographing system.

[0065]

As described above, according to the present invention,
A mount resistance is larger than that obtained when the surfaces of the lens-side mount portion and the camera-side mount portion are joined (contacted) as they are, while the mount connection operation is made easy as before. For this reason, for example, lifting the entire lens device and camera away from the shoulder,
Even in the case where a sudden pan / tilt operation is repeated, it is possible to obtain a strong mount coupling force capable of preventing the coupling between the two mount portions in the direction orthogonal to the optical axis and in the rotational direction. Therefore, it is possible to avoid a deterioration in the operational feeling and the feeling of holding by the photographer due to the so-called rattling caused by slippage at the mount joint.

When an elastic member is used as a member having a high static friction coefficient, a large mounting surface pressure (that is, sliding resistance friction) can be generated by an amount corresponding to the compressive force of this elastic member. The mounting strength can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a mount coupling unit in a photographing system according to a first embodiment of the present invention.

FIG. 2 is a view of the flange surface in FIG.

FIG. 3 is a view of the flange surface in FIG.

FIG. 4 is a view in a direction A of a flange surface of a mount coupling portion in a photographing system according to a second embodiment of the present invention.

FIG. 5 is a view in the B direction of a flange surface of a mount coupling part in an imaging system according to a third embodiment of the present invention.

FIG. 6 is a cross-sectional view of a mount connection part in an imaging system according to a fourth embodiment of the present invention.

FIG. 7 is a view of the flange surface in FIG.

FIG. 8 is a view of the flange surface in FIG.

FIG. 9 is a view in a direction A of a flange surface of a mount coupling portion in an imaging system according to a fifth embodiment of the present invention.

FIG. 10 is a side view of the video camera imaging system.

FIG. 11 is a rear view of the zoom lens.

FIG. 12 is a cross-sectional view of a mount connection part in a conventional video camera imaging system.

FIG. 13 is a view of the flange surface in FIG.

FIG. 14 is a view of the flange surface in FIG.

[Explanation of symbols]

 1,10,101 Video camera 1a, 10a Flange surface of video camera 2,11,102 Zoom lens 3,12 Male bayonet 3a, 12a, 15a Flange surface of zoom lens 4,8,9 Elastic member 5,108 Rotary positioning pin 6, 103 Mounting ring 7, 109 Positioning groove 13 Video camera side connection surface 14 Zoom lens side connection surface 16 Radiation groove 104 Drive unit 105 Belt 106 Shoulder pad 110 Mount

Claims (21)

[Claims] 1. A lens device comprising a lens-side mount portion detachably connected to a camera-side mount portion provided in a camera, wherein a lens-side mount portion has a joint surface with the camera-side mount portion. And a member having a higher coefficient of static friction than the surface of the lens-side mount. 2. The lens device according to claim 1, wherein the member having a high static friction coefficient is an elastic member. 3. The lens device according to claim 1, wherein the member having a high static friction coefficient is provided over substantially the entire circumference of the lens-side mount portion. 4. The lens device according to claim 1, wherein the member having a high static friction coefficient is provided at a plurality of circumferential positions of the lens-side mount portion. 5. A lens device comprising a lens-side mount portion detachably connected to a camera-side mount portion provided in a camera, wherein a lens-side mount portion has a joint surface with the camera-side mount portion. A lens device which is processed to have a higher static friction coefficient than a surface of the lens-side mount portion. 6. The lens device according to claim 5, wherein the processing for increasing the coefficient of static friction is a surface treatment. 7. The lens apparatus according to claim 5, wherein the processing for increasing the coefficient of static friction is processing of a radial groove. 8. The lens device according to claim 5, wherein the processing of increasing the coefficient of static friction is performed over substantially the entire circumference of the lens-side mount portion. 9. The lens device according to claim 5, wherein the processing for increasing the coefficient of static friction is performed at a plurality of circumferential positions of the lens-side mount portion. 10. A camera provided with a camera-side mount portion to which a lens-side mount portion provided on a lens device is detachably coupled, wherein a bonding surface of the camera-side mount portion with the lens-side mount portion is provided. A camera provided with a member having a higher static friction coefficient than a surface of a camera-side mount portion. 11. The camera according to claim 10, wherein the member having a high static friction coefficient is an elastic member. 12. The camera according to claim 10, wherein the member having a high static friction coefficient is provided over substantially the entire circumference of the camera-side mount portion. 13. The camera according to claim 10, wherein the member having a high static friction coefficient is provided at a plurality of positions in a circumferential direction of the camera-side mount portion. 14. A camera provided with a camera-side mount portion to which a lens-side mount portion provided on a lens device is detachably coupled, wherein a bonding surface of the camera-side mount portion with the lens-side mount portion is A camera that has been processed to have a higher static friction coefficient than the surface of the camera-side mount. 15. The processing for increasing the static friction coefficient is as follows:
15. The camera according to claim 14, wherein the camera is a surface treatment. 16. The processing for increasing the coefficient of static friction is as follows:
15. The camera according to claim 14, wherein the processing is a radial groove processing. 17. The processing for increasing the coefficient of static friction is as follows:
17. The camera according to claim 14, wherein the camera is provided over substantially the entire circumference of the camera-side mount. 18. The processing in which the static friction coefficient is increased,
17. The camera according to claim 14, wherein the camera is provided at a plurality of positions in a circumferential direction of the camera-side mount portion. 19. An imaging system comprising: the lens device according to claim 1; and a camera to which the lens device is attached. 20. A photographing system comprising: the camera according to claim 10; and a lens device mounted on the camera. 21. A lens device comprising: the lens device according to any one of claims 1 to 9; and the camera according to any one of claims 10 to 18 to which the lens device is attached. And the shooting system.