JP4574003B2 - Camera, lens apparatus and photographing system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camera having a mount structure for positioning and connecting a lens apparatus with high accuracy and a lens apparatus having a mount structure for positioning and connecting to a camera with high accuracy.
[0002]
[Prior art]
Cameras for shooting broadcasts and photographic lenses are connected with high precision using a connection mechanism called bayonet mount, and it is possible to select a photographic lens to be connected to the camera according to the shooting conditions. It is common to have a configuration that can be used.
[0003]
In addition, the bayonet mount performs radial positioning between the camera and the photographic lens by radial fitting, and the flange portion of the male mount on the photographic lens side is sandwiched by a threaded ring (bayonet ring), and the frictional force between the camera and the photographic lens Positioning and fixing in the thrust direction with the taking lens.
[0004]
In addition, rotation direction positioning (rotation stop) is provided with a rotation stop pin on the flange part of the male mount on the photographic lens side, and the rotation stop pin is inserted into the pin guide (receiver) formed on the female mount on the TV camera side. It is done by doing.
[0005]
Various bayonet mount mechanisms have been proposed, including the bayonet mount locking mechanism described in Japanese Patent Laid-Open No. 8-297316.
[0006]
Here, FIGS. 18 and 19 show a bayonet mount structure provided in a conventional camera. In the figure, 104 is a camera, 105 is a bayonet ring, 106 is a mount lever, 107 is a female mount, 116 is a lock lever, 117 is a compression coil spring, and 118 is a support plate.
[0007]
In this bayonet mount structure, a male lens mount (not shown) is fitted and inserted into the female mount 107, and the mount lever 106 is rotated about 60 degrees in the clockwise direction in the drawing to attach the photographing lens to the camera 104. It becomes a state.
[0008]
At this time, if the lock lever 116 is tilted counterclockwise, the mount ring 105 can always be kept tightened via the lock lever 116 and the mount lever 106 by the force of the spring 117.
[0009]
[Problems to be solved by the invention]
However, although the conventional mount structure is effective for preventing the taking lens from dropping due to the loose bayonet ring, the mount can be fitted and the rotation stop pin can be fitted to the pin guide. There is a drawback that it cannot be suppressed.
[0010]
In particular, when using a shoulder-mount TV camera in combination with a shooting zoom lens, the TV camera is placed on the right shoulder and the drive unit for zooming operation etc. attached to the shooting lens is supported with the right hand. Since it is common to balance the whole, the right hand may feel the fitting of the mount and the fitting of the rotation stopper pin.
[0011]
Although this shape itself does not directly affect the performance of the photographing system, it may give the photographer a sense of discomfort or anxiety.
[0012]
[Means for Solving the Problems]
In order to solve the above-described problems, in the first invention of the present application, in a camera including a camera-side mount portion to which a lens-side mount portion provided in a lens device is fitted and mounted, and a bayonet ring , Hold the side mount part at the position where it is attached to the camera side mount part, and press the pressing member against the lens side mount part from the fitting radial direction to fit the lens side mount part to the camera side mount part In order to switch between a pressed state in which the pressure is pressed in a radial direction and a released state in which the pressed state is released, an operation member that is operated is provided, and when the operation member is in a pressed state, the bayonet ring has a lens When the side mount portion is located at the first position so as not to come off in the optical axis direction and the operation member is in the released state, the bayonet ring is In the second position where the lens unit is opened in the optical axis direction and the lens device can be removed from the camera, in conjunction with the rotation operation of the operation member when the operation member is switched from the released state to the pressed state, The bayonet ring moves from the second position to the first position, and the pin provided on the operation member moves along the cam groove formed on the guide plate fixed to the pressing portion. By sliding toward the center of the optical axis, the pressing member is pressed against the lens side mount .
[0013]
As a result, it is possible to reliably suppress the lens-side mount portion from being fitted to the camera-side mount portion, and to avoid the possibility of giving a sense of discomfort and anxiety to the photographer.
[0014]
The pressing mechanism is configured to be pressed against the lens-side mount portion by configuring the pressing force of the pressing member against the lens-side mount portion in the pressed state to be maximum on the release state side than the pressing completion state. It becomes possible to prevent the pressing member from loosening.
[0021]
With such a rotational displacement suppression means , it is possible to reliably prevent the rotation stop pin from being fitted in the rotation stop opening, and to avoid the possibility of giving a sense of discomfort and anxiety to the photographer. .
[0027]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIGS. 1 to 3 show a photographing system including a television camera and a photographing zoom lens (lens device) according to the first embodiment of the present invention. In these drawings, reference numeral 1 denotes a photographing zoom lens and 4 denotes a television camera. Reference numeral 5 denotes a bayonet ring constituting a mount portion (camera side mount portion) provided in the camera 4.
[0028]
Reference numeral 2 denotes a male mount (lens side mount portion) on the photographing lens 1 side, and 3 denotes a rotation stop pin provided on the rear end surface in the optical axis direction of the male mount portion 2.
[0029]
Further, 6 is a mount lever provided on the outer periphery of the bayonet ring 5, and 6 a is a slide pin provided at the base end of the mount lever 6. The bayonet ring 5 and the mount lever 6 constitute an “operation member” in the claims.
[0030]
Reference numeral 7 denotes a female mount on the camera 4 side. Reference numeral 9 in FIG. 4 (view of the photographing lens 1 as viewed from the image side toward the object side) is a drive unit attached to the photographing lens 1, and an operation switch for performing a zooming operation or the like of the photographing lens 1 is provided. Is provided.
[0031]
5 and 6 show a state in which the photographic lens 1 is not attached and attached when the mount portion provided in the camera 4 is viewed from the image side toward the object side.
[0032]
Reference numeral 8 denotes a pin guide attached to the upper front end of the female mount 7. The pin guide 8 has an opening (rotation stop opening) 8 a into which the rotation stop pin 3 can be inserted from the optical axis direction. Has been.
[0033]
7 and 8 show a state in which the photographing lens 1 is not attached and attached when the female mount 7 provided in the camera 4 is viewed from the object side to the image side.
[0034]
Reference numeral 10 denotes a substantially arc-shaped guide plate attached to the front surface of the female mount 7, and the guide plate (cam member) 10 is formed with a cam groove 10a that engages with the slide pin 6a. In addition, elongated holes that engage with pins 12 a and 12 b provided on the female mount 7 are formed at both ends of the guide plate 10 in the arc direction. By inserting the pins 12a and 12b through the elongated holes and attaching the E-type retaining rings 13a and 13b for retaining the pins 12a and 12b, the guide plate 10 is mounted in the radial direction of the mount portion (in the direction perpendicular to the optical axis). A female mount 7 is slidably attached.
[0035]
Reference numeral 11 denotes a pressing plate (pressing member), which is fixed to the guide plate 10 by adhesion or the like.
[0036]
The mount lever 6 (bayonet ring 5), the guide plate 10 and the pressing plate 11 constitute a “pressing mechanism” as defined in the claims.
[0037]
The mount part on the camera 4 side thus configured and the male mount 2 of the photographic lens 1 are mechanically mounted and coupled with the C surface as a mating surface, as shown in FIGS. When the C surface is joined, as shown in FIG. 5, the bayonet ring 5 is a rotational position where the male mount 2 of the photographic lens 1 can be inserted into the space between the bayonet ring 5 and the female mount 7. It is in. At this time, the rotation stop pin 3 on the male mount 2 is inserted into the opening 8 a of the pin guide 8.
[0038]
After the C-plane of the camera 4 and the taking lens 1 is joined in this way, the mount lever 6 and bayonet ring 5 are rotated downward by about 60 ° with respect to the female mount 7 as shown in FIGS. Then, the bayonet ring 5 holds the male mount 2 inserted in the space between the bayonet ring 5 and the female mount 7 so as not to come out forward in the optical axis direction (that is, at a position where the male mount 7 is attached). Rotate to the position you want.
[0039]
Further, the guide plate 10 and the pressing plate 11 are light-coupled by the cam action of the slide pin 6 a provided on the mount lever 6 and the cam groove 10 a formed on the guide plate 10 in conjunction with the rotation of the bayonet ring 5. Slide toward the center of the shaft (inward in the fitting radial direction).
[0040]
The slidable pressing plate 11 presses the male mount 2 of the photographic lens 1 in the same direction, and presses the outer peripheral surface of the male mount 2 against the inner peripheral surface of the female mount 7. In other words, the male mount 2 is sandwiched between the pressing plate 11 and the female mount 7. Thereby, the fitting between the male mount 2 and the female mount 7 can be reliably suppressed.
[0041]
If the mount lever 6 and the bayonet ring 5 are rotated upward by about 60 ° with respect to the female mount 7, the state returns to the state shown in FIGS. 2 and 5, and the male mount 2 of the photographing lens 1 is pressed by the pressing plate 11. While the state is released, the bayonet ring 5 rotates to a position where the male mount 2 is opened forward in the optical axis direction, so that the photographing lens 1 can be removed from the camera 4.
[0042]
By the way, in this embodiment, the rotation stop pin (in this embodiment, the rotational displacement suppression means referred to in the claims) 3 provided on the photographing lens 1 is made as shown in FIGS. In other words, the fitting portion (cylindrical peripheral surface portion) of the rotation stopper pin 3 formed in the bottomed cylindrical shape with the opening 8a of the pin guide 8 is divided, and this fitting portion is further inserted into the pin guide 8. It is made slightly larger than the size of the opening 8a.
[0043]
As a result, when the anti-rotation pin 3 is fitted into the opening 8 a of the pin guide 8, the fitting portion of the anti-rotation pin 3 undergoes elastic deformation, and this elastic force causes the anti-rotation pin 3 and the pin guide 8 to be fitted. Joining is suppressed. Therefore, the rotation of the lens device 1 around the optical axis with respect to the camera 4 is suppressed.
[0044]
(Second Embodiment)
FIG. 11 and FIG. 12 show a fitting structure between the rotation stop pin and the pin guide in the photographing system according to the second embodiment of the present invention. In the present embodiment, components common to the first embodiment are denoted by the same reference numerals as those in the first embodiment.
[0045]
In the present embodiment, the pin guide 8 provided on the female mount 7 of the camera 1 is provided with a leaf spring (rotational displacement suppression means) 24 that extends into the opening from both sides of the opening, while the rotation provided on the photographing lens 1. The stop pin 23 is formed in a simple cylindrical shape as in the conventional case.
[0046]
When the anti-rotation pin 23 is inserted into the opening of the pin guide 8, the anti-rotation pin 23 is sandwiched and held while the leaf spring 24 is elastically deformed. As a result, the engagement between the rotation stop pin 23 and the pin guide 8 is suppressed.
[0047]
(Third embodiment)
FIG. 13 and FIG. 14 show a fitting structure between the rotation stop pin and the pin guide in the photographing system according to the third embodiment of the present invention. In the present embodiment, components common to the first embodiment are denoted by the same reference numerals as those in the first embodiment.
[0048]
In the present embodiment, the shape of the opening of the pin guide 38 provided on the female mount 7 of the camera 1 is a tapered shape that becomes narrower in the insertion direction of the rotation stop pin 33 provided on the photographing lens 1. At the same time, the rotation stop pin 33 is also formed in a tapered shape along the tapered inner surface of the opening of the pin guide 38.
[0049]
Further, a compression coil spring 35 is provided in the male mount 32 provided on the photographing lens 1 to urge the rotation stop pin 33 in the protruding direction (in the insertion direction into the opening of the pin guide 38).
[0050]
In the present embodiment, the pin guide 38, the rotation stop pin 33, and the compression coil spring 35 constitute a rotational displacement suppressing means as defined in the claims.
[0051]
When the anti-rotation pin 33 is inserted into the opening of the pin guide 38, the taper outer surface 24 of the anti-rotation pin 33 is pressed against the tapered inner surface of the opening of the pin guide 38 by the biasing force of the coil spring 35. As a result, the engagement between the rotation stop pin 33 and the pin guide 38 is suppressed.
[0052]
(Fourth embodiment)
FIGS. 15 to 17 show the configuration of the mount portion on the camera 1 side in the photographing system according to the fourth embodiment of the present invention. In the present embodiment, components common to the first embodiment are denoted by the same reference numerals as those in the first embodiment.
[0053]
In the first embodiment, the pressing force of the pressing plate 11 against the male mount 2 smoothly increases according to the downward operation of the mount lever 6 when the cam groove 10a of the guide plate 10 is pressed. In this embodiment, the pressing force (torque) is applied to the cam groove 40a of the guide plate 40 after the downward operation of the mount lever 6 is started (d in FIG. 15). Once (that is, before completion of the operation of the mount lever 6: e in FIG. 16), the maximum is reached, and then, when the operation of the mount lever 6 is completed (f in FIG. 17), the above-mentioned pressing force is applied between the mounts 2 and 7 It is formed in a shape that decreases to a size that is necessary and sufficient to suppress rattling.
[0054]
With this configuration, the maximum pressing force (or cam groove shape) obtained in e of FIG. 16 is a so-called click with respect to the pressing force for suppressing the fitting obtained in f of FIG. Therefore, the pressing plate 11 can prevent the pressing state against the male mount 2 from being loosened.
[0055]
In each of the above embodiments, the case where the male mount is provided on the photographing lens side and the female mount is provided on the camera side has been described. However, the female mount may be provided on the photographing lens side and the male mount may be provided on the camera side. . In this case, a pressing mechanism similar to that described in the above embodiments is provided on the photographing lens side, and a rotation stop pin is provided on the camera side.
[0056]
That is, on the photographic lens side, the pressing member is pressed from the fitting radial direction against the camera side mounting portion mounted on the lens side mounting portion, and the camera side mounting portion is pressed against the lens side mounting portion in the fitting radial direction. A pressing mechanism that can be pressed (becomes pressed) is provided, so that the fitting of the camera-side mount to the lens-side mount can be reliably suppressed, and the photographer feels uncomfortable or uneasy Avoid the risk of giving
[0057]
Further, the pressing mechanism is configured so that the pressing force of the pressing member on the camera side mount portion in the pressing state is maximized on the release state side than the pressing completion state, and the pressing mechanism is pressed against the camera side mounting portion. The loosening of the member (that is, the occurrence of fitting) is prevented.
[0058]
In addition, an operating member for switching the pressing mechanism between a pressed state and a released state, and a position corresponding to the pressed state and a position corresponding to the released state of the pressing member according to the operation of the operating member And a cam member that drives the cam between them, the above-described fitting can be suppressed with a simple mechanism and a simple operation.
[0059]
Furthermore, when a bayonet ring is provided on the lens-side mount, the pressing mechanism is operated in conjunction with the rotation of the bayonet ring, and the lens device and the camera are mounted and held by the bayonet ring. At the same time, the above-described fitting by the pressing mechanism can be suppressed, and the ease of mounting (detaching) the lens device is ensured.
[0060]
Furthermore, with the rotation stop pin provided on the camera side inserted into the rotation stop opening provided on the lens side, the displacement of the rotation stop pin in the rotation stop opening in the relative rotation direction is suppressed, The fitting of the rotation stopper pin in the rotation stopper opening (that is, relative rotation between the camera and the photographing lens) is surely suppressed to avoid the possibility of giving the photographer a sense of discomfort or anxiety.
[0061]
【The invention's effect】
As described above, according to the first invention of this application, the pressing member is pressed from the fitting radial direction against the lens side mounting portion mounted on the camera side mounting portion, and the lens side mounting portion is pressed against the camera side mounting portion. Since a pressing mechanism that can be pressed in the fitting radial direction (becomes a pressing state) is provided, it is possible to reliably suppress the fitting of the lens side mount part to the camera side mount part, The possibility of giving the photographer a sense of incongruity or anxiety can be avoided.
[0062]
Since the pressing mechanism can release the pressed state, the lens device can be easily detached from the camera.
[0063]
Further, if the pressing mechanism is configured such that the pressing force of the pressing member on the lens side mount portion in the pressed state is maximized on the released state side than the pressed completion state, the pressing force pressed against the lens side mount portion It is possible to prevent the member from loosening (that is, the occurrence of fitting).
[0064]
In addition, an operating member for switching the pressing mechanism between a pressed state and a released state, and a position corresponding to the pressed state and a position corresponding to the released state of the pressing member according to the operation of the operating member If it has the structure which has a cam member which carries out a cam drive between, the above-mentioned fitting can be suppressed with a simple mechanism and simple operation.
[0065]
Furthermore, when a bayonet ring is provided on the camera side mount, if the pressing mechanism is operated in conjunction with the rotation of the bayonet ring, the lens device is mounted and held by the bayonet ring. The above-described fitting by the mechanism can be suppressed, and the ease of mounting (detaching) the lens device can be ensured.
[0066]
Further, according to the second and third aspects of the present invention, in the state where the rotation prevention pin is inserted into the rotation prevention opening, the rotation of the rotation prevention pin in the rotation prevention opening is suppressed in the relative rotation direction. Therefore, the anti-rotation pin can be reliably restrained from fitting in the rotation-preventing opening (that is, relative rotation of the photographing lens with respect to the camera), giving the photographer a sense of incongruity and anxiety. Fear can be avoided.
[0067]
According to the fourth aspect of the present invention, in the lens device including the lens side mount portion fitted and attached to the camera side mount portion provided in the camera, the camera side mount portion attached to the lens side mount portion may be On the other hand, the pressing member is pressed from the fitting radial direction so that the camera side mount portion is pressed against the lens side mounting portion in the fitting radial direction, and the pressing state is operable to release the pressed state. A mechanism is provided.
[0068]
Accordingly, it is possible to reliably suppress the camera-side mount portion from being fitted to the lens-side mount portion, and to avoid the possibility of giving a sense of discomfort and anxiety to the photographer.
[0069]
Further, according to the fourth invention of the present application, the pressing member is pressed from the fitting radial direction against the camera-side mount portion to which the lens-side mount portion is attached, and the camera-side mount portion is fitted to the lens-side mount portion. Since a pressing mechanism that can be pressed in a radial direction (becomes a pressing state) is provided, it is possible to reliably prevent the camera-side mount portion from being fitted to the lens-side mount portion. The possibility of giving a sense of incongruity or anxiety can be avoided.
[0070]
In addition, according to the fifth and sixth inventions of the present application, it is possible to reliably suppress the anti-rotation pin from being fitted in the anti-rotation opening, and avoid the possibility of giving the photographer a sense of discomfort or anxiety. be able to.
[Brief description of the drawings]
FIG. 1 is a side view of a photographing system according to a first embodiment of the present invention.
FIG. 2 is a detailed view of a bayonet mount in a state where a photographing lens constituting the photographing system is removed from the camera.
FIG. 3 is a detailed view of a bayonet mount in a state where the photographing lens is attached to a camera.
4 is a view of the photographing lens as viewed from the camera side (backward in the optical axis direction), and is a view in FIG.
5 is a view of the camera seen from the photographic lens side (front side in the optical axis direction), and shows a state in which the photographic lens can be attached and detached, as viewed from b in FIG.
6 is a view of the camera seen from the photographic lens side (front side in the optical axis direction), and shows a state where the photographic lens is mounted, as viewed from b in FIG.
7 is a view of a female mount constituting the bayonet mount (cross-sectional view taken along line XX in FIG. 3). FIG.
FIG. 8 is a view of a female mount constituting the bayonet mount (cross-sectional view taken along the line XX in FIG. 3). FIG.
FIG. 9 is a view showing a relationship between a rotation stopper pin and a pin guide in the bayonet mount (a relationship before mounting a photographic lens);
10 is a view showing a relationship between a rotation-preventing pin and a pin guide in the bayonet mount (a relationship when a photographic lens is mounted), and is a cross-sectional view taken along line YY in FIG. 6;
FIG. 11 is a diagram illustrating a relationship between a rotation stop pin and a pin guide (a relationship before mounting a photographic lens) in a photographic system according to a second embodiment of the present invention.
FIG. 12 is a view showing a relationship between a rotation stop pin and a pin guide of the second embodiment (a relationship when a photographing lens is mounted).
FIG. 13 is a diagram illustrating a relationship between a rotation stop pin and a pin guide (a relationship before a photographic lens is mounted) in a photographic system that is the third embodiment of the present invention.
FIG. 14 is a diagram illustrating a relationship between a rotation stopper pin and a pin guide (a relationship when a photographic lens is mounted) according to the third embodiment.
FIG. 15 is a diagram showing a configuration of a female mount on a camera side (detachable state of a photographic lens) and a change in pressing force of a pressing plate in an imaging system according to a fourth embodiment of the present invention.
FIG. 16 is a diagram illustrating a configuration of a female mount on the camera side (while the photographic lens is being attached) and a change in pressing force of a pressing plate in the imaging system according to the fourth embodiment.
FIG. 17 is a diagram illustrating a configuration of a camera-side female mount (a state in which a photographing lens is completely attached) and a change in pressing force of a pressing plate in the photographing system according to the fourth embodiment.
FIG. 18 is a front view showing a conventional bayonet mount structure.
FIG. 19 is a side view showing a conventional bayonet mount structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shooting lens 2 (Lens side) Male mount 3, 23, 33 Anti-rotation pin 4 Camera 5 Bayonet ring 6 Mount lever 7 (Camera side) Female mount 8 Pin guide 9 Drive unit 10, 40 Guide plate 10a, 40a Cam groove 11 Press Plate 12a, 12b Pin 13a, 13b E-type retaining ring 24 Leaf spring 35 Compression coil spring 16 Lock lever

Claims (5)

In a camera provided with a camera side mount part fitted and fitted with a lens side mount part provided in the lens device, and a bayonet ring,
The lens side mount portion is held at a position where the lens side mount portion is attached to the camera side mount portion, and a pressing member is pressed against the lens side mount portion from the fitting radial direction so that the lens side mount portion is moved to the camera side mount portion. An operation member that is operated to switch between a pressed state in which the pressure is pressed in the fitting radial direction and a released state that releases the pressed state,
When the operation member is in a pressed state, the bayonet ring is located at a first position such that the lens side mount portion does not come off in the optical axis direction,
When the operation member is in a released state, the bayonet ring is located at a second position where the lens side mount portion is opened in the optical axis direction and the lens device can be detached from the camera;
The bayonet ring moves from the second position to the first position in conjunction with the rotation operation of the operation member when the operation member is switched from the released state to the pressed state, and is applied to the pressing portion. A pin provided on the operating member moves along a cam groove formed on a fixed guide plate, and the pressing member is slid toward the optical axis center to thereby move the pressing member to the lens. Press-contact to the side mount part,
A camera characterized by that.   The pressing mechanism is configured such that a pressing force of the pressing member against the lens-side mount portion in the pressing state is maximum on the release state side than the pressing completion state. The camera according to 1. An anti-rotation opening for stopping relative rotation between the camera side mount part and the lens side mount part is formed in the camera side mount part by inserting a rotation stop pin provided on the lens side mount part. And
In the state in which the rotation stop pin is inserted into the rotation stop opening, the rotation stop suppression means for suppressing the displacement of the rotation stop pin in the rotation stop opening in the relative rotation direction is provided. The camera according to claim 1 or 2 . Claim 3 wherein the rotational displacement suppressing means, characterized in that it is constituted by an elastic holding member for holding resiliently said detent pin that is inserted into the rotation stopping opening in the relative rotational direction Camera described in. A rotation stop pin for stopping relative rotation between the camera side mount portion and the lens side mount portion by being inserted into the rotation stop opening portion provided in the lens side mount portion from the optical axis direction in the camera side mount portion. Is provided,
A rotation displacement suppression means for suppressing displacement of the rotation stop pin in the relative rotation direction within the rotation stop opening in a state where the rotation stop pin is inserted into the rotation stop opening. Item 3. The camera according to Item 1 or 2 .

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