JP3804839B2 - Camera lens equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camera lens device, and more particularly to a camera lens device applied to an optical machine such as a camera or a video camera.
[0002]
[Prior art]
In a camera that manually performs operations such as aperture and zoom, a click mechanism or a friction mechanism is employed for the operation ring so that the operation ring does not rotate due to vibration or the like.
On the other hand, cameras that automatically perform operations such as aperture and zoom are driven using a small motor from the viewpoint of power saving, compactness, etc., so a click mechanism or friction mechanism that requires a load when driving is adopted. It has not been.
[0003]
For this reason, conventionally, a camera for manual operation and a camera for automatic operation have been produced with different specifications.
[0004]
[Problems to be solved by the invention]
However, as described above, there is a drawback in that the cost increases when the manual operation camera and the automatic operation camera are produced in different specifications.
In addition, there is a demand that the user attach and detach the drive unit and want to use both manual and automatic.
[0005]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a camera lens device capable of selectively using manual operation and automatic operation with a single lens.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is provided with a click mechanism that applies a predetermined response to the rotation operation of the operation ring by pressing and abutting a click spring on the click formed on the inner periphery of the operation ring. In a camera lens device, a drive unit that is mounted on a lens body and motor-drives the operation ring, and is provided in the drive unit, and when the drive unit is mounted on the lens body, the click spring is pressed, And a release member for releasing the engagement between the click and the click spring .
[0007]
According to the present invention, the fixed support mechanism is connected to the operation ring during manual operation, but the connection is forcibly released during automatic operation. Thus, the operation ring can be operated without applying a load to the motor during automatic operation.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a camera lens device according to the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a side sectional view of an ENG camera television lens to which the present invention is applied.
[0009]
As shown in the figure, on the lens barrel 12 of the television lens 10, a focus lens 14, a variable power lens 16, a correction lens 18, an aperture device 20, and a relay lens 22 are sequentially arranged from the front of the optical axis L. ing.
The focus lens 14 is fixed to a focus ring 24, and the focus ring 24 is engaged with the lens barrel 12 via a helicoid screw 26.
[0010]
A focus gear 28 is formed on the outer periphery of the focus ring 24. When the drive unit 78 is mounted on the lens barrel 12, the focus gear 28 is engaged with a focus drive gear 82 </ b> A connected to a focus drive motor 82 built in the drive unit 78. The focus lens 14 moves back and forth along the optical axis L by the action of the helicoid screw 26 when the focus drive motor 82 rotates forward / reversely.
[0011]
The variable power lens 16 is supported by a lens frame 29 for a variable power lens, and a pin 30 is implanted in the lens frame 29 for the variable power lens. The pin 30 is engaged with a variable magnification lens cam groove 34 formed in the cam barrel 32 and is also engaged with a rectilinear groove 36 formed in the lens barrel 12.
The correction lens 18 is supported by a correction lens lens frame 38, and a pin 40 is implanted in the zoom lens frame 38. The pin 40 is engaged with a correction lens cam groove 42 formed in the cam barrel 32 and is engaged with a rectilinear groove 36 formed in the lens barrel 12.
[0012]
A pin 44 is implanted in the cam cylinder 32, and the pin 44 is connected to a zoom ring 48 through a relief groove 46 formed in the lens barrel 12. Therefore, the cam cylinder 32 is rotated by rotating the zoom ring 48.
A zoom gear 50 is formed on the outer periphery of the zoom ring 48. When the drive unit 78 is mounted on the lens barrel 12, the zoom gear 50 is engaged with a zoom drive gear 84 </ b> A connected to a zoom drive motor 84 built in the drive unit 78.
[0013]
The zoom lens 16 moves back and forth in the optical axis L direction along the locus of the zoom lens cam groove 34 when the zoom drive motor 84 is rotated forward / reversely. Similarly, the correction lens 18 also moves back and forth in the direction of the optical axis L along the locus of the correction lens cam groove 42. Since the zoom lens 16 and the correction lens 18 are lenses having positive power, WIDE shooting can be performed at the position where the zoom lens 16 and the correction lens 18 are farthest from each other, and TELE shooting can be performed at the closest position. it can.
[0014]
The relay lens 22 is supported by a relay lens lens frame 51, and the relay lens lens frame 51 is supported by a holding ring 52 connected to a rear end portion of the lens barrel 12.
The diaphragm device 20 includes an iris ring 54, a Kiza seat 56, a plurality of diaphragm blades 58, 58..., And a diaphragm frame 60.
[0015]
The iris ring 54 is rotatably supported by the holding ring 52, and an iris gear 62 is formed on the outer peripheral surface thereof. When the drive unit 78 is mounted on the lens barrel 12, the iris gear 62 is meshed with an iris drive gear 86 </ b> A connected to an iris drive motor 86 built in the drive unit 78.
[0016]
A chrysanthemum 56 is connected to the inside of the iris ring 54 via a pin 64. The pin 64 is inserted into a clearance groove 66 formed in the holding ring 52, so that the pin 64 does not interfere with the holding ring 52 during the rotation of the iris ring 54. .
The chrysanthemum 56 is formed in a donut shape, and a plurality of grooves (not shown) are formed radially around the optical axis L on the surface thereof. A dowel pin (not shown) provided on one surface of the diaphragm blade is engaged with these grooves.
[0017]
Further, a rotation pin (not shown) is provided on the other surface of the diaphragm blades 58, 58..., And this rotation pin is rotatably engaged with a hole (not shown) formed in the diaphragm frame 60. .
With the above configuration, when the star seat 56 is rotated via the iris ring 54, the aperture blades 58, 58... Are formed in the dowel pins and the groove of the star seat, and the holes of the rotary pins and the aperture frame 60. The aperture diameter is adjusted by the action.
[0018]
By the way, the diaphragm device 20 is provided with a click mechanism. This click mechanism is for preventing the iris value from changing due to vibration or the like when the iris is manually operated, and is configured as follows.
FIG. 2 is a main part sectional view showing an automatic operation mode in which the drive unit 78 is mounted on the TV lens 10, and FIG. 3 is a main part sectional view showing a manual operation mode in which the drive unit 78 is detached from the TV lens 10. is there.
[0019]
As shown in FIGS. 2 and 3, an annular groove 68 is formed in the iris ring 54. Clicks 70 are formed at regular intervals on the inner peripheral surface of the groove 68 (the surface corresponding to the back surface of the iris gear 62). The click 70 is fixed to the holding ring 52. However, as shown in FIG. 3, the click spring 72 is pressed and abutted by the urging force of the click spring 72 itself.
[0020]
By providing the click mechanism configured as described above, when the camera operator rotates the iris ring 54 and adjusts the iris during the manual operation shown in FIG. 3, the click spring 72 is clicked 70 each time the iris ring 54 rotates. The iris ring 54 is locked with a clicking response. Thereby, it is possible to effectively prevent the iris value from changing due to the vibration of the iris ring 54 and the like.
[0021]
By the way, as described above, the click mechanism works effectively when the diaphragm is manually operated, but when the diaphragm is automatically adjusted, it becomes a driving load for the iris drive motor 86. For this reason, the click spring 72 can be disengaged from the click 70 by the retracting means having the following configuration.
As shown in FIG. 2, an insertion hole 74 is formed in the holding ring 52 to which the click spring 72 is fixed so as to be orthogonal to the click spring 72. When the pressing pin 76 is inserted into the insertion hole 74, the click spring 72 is pressed by the pressing pin 76 and is forcibly retracted from the click 70. Thereby, the click mechanism is released by the pressing pin 76.
[0022]
The pressing pin 76 is provided in the drive unit 78, and is configured to be inserted into the insertion hole 74 when the drive unit 78 is attached to the lens barrel 12.
The drive unit 78 is attached to the side portion of the lens barrel 12 via a screw (not shown). The drive unit 78 includes a focus drive motor 82, a zoom drive motor 84, and an iris drive motor 86. The spindle of each drive motor has a focus drive gear 82A, a zoom drive gear 84A, and an iris drive gear, respectively. 86A is connected.
[0023]
As described above, when the drive unit 78 is attached to the lens barrel 12, the focus drive gear 82A is the focus gear 28, the zoom drive gear 84A is the zoom gear 50, and the iris drive gear 86A is the iris gear 62. Are engaged with each other. Further, the pressing pin 76 is inserted into the insertion hole 74 to press the click spring 72 and retract from the click 70.
[0024]
The operation of the lens device of the camera of the present embodiment configured as described above is as follows.
First, the case where the diaphragm adjustment is performed manually will be described. In this case, the television lens 10 is used with the drive unit 78 removed. When the drive unit 78 is removed from the lens barrel 12, the pressing pin 76 comes out of the insertion hole 74, so that the restriction by the pressing pin 76 is released and the click spring 72 is pressed against the click 70 as shown in FIG. .
[0025]
In this state, when the operator of the camera rotates the iris ring 54 to adjust the iris, the click spring 72 is engaged with the click 70 every time the iris ring 54 rotates, and the iris ring 54 is locked with a click. Is done.
As a result, it is possible to prevent the iris value from being changed by the iris ring 54 rotating due to vibration or the like. The click response also serves as a guide when adjusting the aperture.
[0026]
Next, the case where the aperture adjustment is automatically performed will be described. In this case, the television lens 10 is used with the drive unit 78 attached. The drive unit 78 is attached to the lens barrel 12 of the television lens 10 via a screw (not shown).
When the drive unit 78 is attached to the lens barrel 12, the focus drive gear 82A is engaged with the focus gear 28, the zoom drive gear 84A is engaged with the zoom gear 50, and the iris drive gear 86A is engaged with the iris gear 62. . At the same time, the pressing pin 76 provided in the drive unit 78 is inserted into the insertion hole 74.
[0027]
When the pressing pin 76 is inserted into the insertion hole 74, as shown in FIG. 2, the pressing pin 76 presses the click spring 72, and as a result, the click spring 72 is forcibly retracted from the click 70.
Therefore, even if the iris drive motor 86 is driven in this state, the iris drive motor 86 is not loaded with the click mechanism.
[0028]
As described above, according to the diaphragm device of the present embodiment, the click mechanism can be operated only during manual operation, so that manual operation and automatic operation can be arbitrarily used with one television lens 10. it can.
In this embodiment, the pressing pin 76 is provided in the drive unit 78, and when the drive unit 78 is attached to the lens barrel 12, the pressing pin 76 automatically presses the click spring 72 and retracts from the click 70. However, it may be configured as follows.
[0029]
That is, the insertion hole 74 is a screw hole, and the pressing pin 76 inserted into the insertion hole 74 is a bolt. The bolt is provided independently of the drive unit 78, and the click spring 72 is pressed and retracted from the click 70 by screwing the bolt into the screw hole.
Thereby, even in a state where the drive unit 78 is not mounted, the click mechanism can be optionally activated and released.
[0030]
Further, in the present embodiment, the case where the click 70 is formed on the iris ring 54 has been described, but the click mechanism is selectively used by using the same means even when the click is formed on the Kikuza 56. Can be operated.
In this embodiment, the case where the aperture mechanism 20 is provided with the click mechanism has been described. However, the present invention can also be applied to the case where the focus apparatus or the zoom device is provided with the click mechanism.
[0031]
【The invention's effect】
As described above, according to the camera lens device of the present invention, the fixed support mechanism can be operated and released optionally by the member that releases the connection between the fixed support mechanism and the operation ring. One lens can be used for manual operation and automatic operation.
[Brief description of the drawings]
1 is a side cross-sectional view of an ENG camera television lens to which the present invention is applied; FIG. 2 is an enlarged cross-sectional view showing the main part of FIG. 1. FIG. 3 is an enlarged cross-sectional view showing the main part of FIG. Explanation】
DESCRIPTION OF SYMBOLS 10 ... Television lens 20 ... Aperture device 54 ... Iris ring 56 ... Kikuza 58 ... Aperture blade 60 ... Aperture frame 70 ... Click 72 ... Click spring 76 ... Pressing pin 78 ... Drive unit

Claims (1)

In a lens device of a camera provided with a click mechanism that presses and abuts a click spring on a click formed on the inner periphery of the operation ring to give a predetermined response to the rotation operation of the operation ring ,
A drive unit mounted on the lens body and driving the operation ring by a motor;
A release member that is provided in the drive unit, and when the drive unit is mounted on the lens body, presses the click spring to release the engagement between the click and the click spring ;
A lens device for a camera, comprising:

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