JPH10274735A - Lens device for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To actuate an operation ring without imposing load on a motor at the time of automatic operation by providing a release member for releasing a coupling between the operation ring and a fixed supporting mechanism. SOLUTION: An insertion hole 74 is formed on a holding ring 52 where a click spring 72 is fixed so that it may be orthogonal to the spring 72. When a pressing pin 76 is inserted in the hole 74, the spring 72 is pressed by the pin 76 and forcibly retreated from a click 70. Thus, a click mechanism is released by the pin 76. The pin 76 is provided in a drive unit 78 and constituted to be inserted in the hole 74 when the unit 78 is attached to a lens barrel 12. Therefore, even when an iris driving motor 86 is driven in such a state, the load is not imposed on the motor 86 by the click mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field 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]

2. Description of the Related Art In a camera for manually performing operations such as a stop and a zoom, a click mechanism or a friction mechanism is employed in 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 use a small motor from the viewpoint of power saving and compactness. It has not been.

For this reason, conventionally, a camera for manual operation and a camera for automatic operation have been produced with different specifications.

[0004]

However, as described above, if a camera for manual operation and a camera for automatic operation are manufactured with different specifications, there is a disadvantage that the cost is increased. There is also a demand that a user attaches and detaches a drive unit and wants to use manually and automatically.

[0005] The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a lens apparatus for a camera in which one lens can be used for manual operation and automatic operation.

[0006]

According to the present invention, in order to achieve the above object, a fixed support mechanism is connected to an operation ring of a camera lens so that the operation ring does not rotate until a given power is applied. In the above-described camera lens device, a release member for releasing the connection between the operation ring and the fixed support mechanism is provided.

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, at the time of automatic operation, the operation ring can be operated without applying a load to the motor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a lens device for a camera 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 a television lens for an ENG camera to which the present invention is applied.

As shown in FIG.
In the lens barrel 12, a focus lens 14, a variable power lens 16, a correction lens 18, a diaphragm device 20, and a relay lens 22 are arranged in this order from the front of the optical axis L. 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.

A focus gear 28 is formed on the outer periphery of the focus ring 24. The focus gear 28 is configured such that the drive unit 78 is connected to the lens barrel 12.
When mounted on the drive unit 78, it is engaged with a focus drive gear 82A connected to a focus drive motor 82 built in the drive unit 78. The focus lens 14
When the focus drive motor 82 is rotated forward / reversely, the optical axis L is controlled by the action of the helicoid screw 26.
Move back and forth along

The variable power lens 16 is supported by a variable power lens frame 29,
A pin 30 is implanted in 9. This pin 30
It is engaged with a variable power 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 lens frame 38 for a correction lens, and a pin 40 is implanted in the lens frame 38 for a variable power lens. The pin 40 is engaged with the cam groove 42 for the correction lens formed on the cam barrel 32, and is also engaged with the rectilinear groove 36 formed on the lens barrel 12.

A pin 44 is implanted in the cam barrel 32, and the pin 44 is connected to a zoom ring 48 through a clearance groove 46 formed in the lens barrel 12. Therefore, by rotating the zoom ring 48, the cam barrel 32 is rotated. 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 84A connected to a zoom drive motor 84 built in the camera.

When the zoom drive motor 84 is rotated forward / reversely, the variable power lens 16 moves back and forth in the optical axis L direction along the locus of the variable power lens cam groove 34.
Similarly, the correction lens 18 also moves back and forth in the optical axis L direction along the locus of the correction lens cam groove 42. Since the variable power lens 16 and the correction lens 18 are lenses having positive power, WIDE imaging can be performed at a position where the variable power lens 16 and the correction lens 18 are farthest from each other, and TELE imaging can be performed at a position closest to the variable power lens 16 and the correction lens 18. it can.

The relay lens 22 is supported by a relay lens lens frame 51. The relay lens lens frame 51 is supported by a holding ring 52 connected to the rear end of the lens barrel 12. I have. The aperture device 20 includes an iris ring 54, a chrysanthemum seat 56, a plurality of aperture blades 58,
8 and an aperture frame 60.

The iris ring 54 includes the retaining ring 5
An iris gear 62 is formed on the outer peripheral surface of the iris gear 62. This iris gear 62
When the drive unit 78 is mounted on the lens barrel 12, the drive unit 78 meshes with an iris drive gear 86A connected to an iris drive motor 86 built in the drive unit 78.

A chrysanthemum seat 56 is connected to the inside of the iris ring 54 via a pin 64. This pin 64
Is inserted into an escape groove 66 formed in the holding ring 52, so that the pin 64 does not interfere with the holding ring 52 during rotation of the iris ring 54. The chrysanthemum seat 56 is formed in a donut shape, and a plurality of grooves (not shown) are radially formed on the surface thereof around the optical axis L. A dowel pin (not shown) provided on one surface of the aperture blade is engaged with these grooves.

A rotating pin (not shown) is provided on the other surface of the diaphragm blades 58. The rotating pin is rotatably engaged with a hole (not shown) formed in the diaphragm frame 60. Have been. With the above configuration, when the chrysanthemum seat 56 is rotated via the iris ring 54, the aperture blades 58, 58...
The aperture diameter is adjusted by the action of the rotation pin and the hole of the aperture frame 60.

Incidentally, the aperture device 20 is provided with a click mechanism. This click mechanism is for preventing the iris ring 54 from rotating due to vibration or the like during manual operation of the aperture and changing the aperture value, and is configured as follows. FIG. 2 shows the drive unit 78.
FIG. 3 is a cross-sectional view of a main part showing an automatic operation mode mounted on the television lens 10, and FIG. 3 is a cross-sectional view of a main part showing a manual operation mode in which the drive unit 78 is removed from the TV lens 10.

As shown in FIGS. 2 and 3, the iris ring 54 has an annular groove 68 formed therein. 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), and the click 70 has a click spring 72 fixed to the holding ring 52. However, as shown in FIG. 3, the click spring 72 is pressed and contacted by the urging force of the click spring 72 itself.

By providing the click mechanism having the above configuration, when the camera operator rotates the iris ring 54 to adjust the aperture during the manual operation shown in FIG. 3, the click spring 72 is rotated every time the iris ring 54 rotates. Engages with the click 70, and the iris ring 54 is locked with a click. This effectively prevents the iris ring 54 from rotating and changing the aperture value due to vibration or the like.

As described above, the click mechanism works effectively at the time of manual operation of the iris, but rather acts as a driving load of the iris drive motor 86 at the time of automatic adjustment of the iris. Therefore, 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. The insertion pin 74 has a pressing pin 7
When the click 6 is inserted, 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.

The pressing pin 76 is provided on the drive unit 78, and the drive unit 78
Is attached to the lens barrel 12, the insertion hole 74
It is configured to be inserted into. The drive unit 78 is connected to the lens barrel 1 via a screw (not shown).
2 is attached to the side. A focus drive motor 82, a zoom drive motor 84, and an iris drive motor 86 are built in the drive unit 78. 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.

As described above, the drive unit 7
When the lens 8 is mounted on the lens barrel 12, the focus drive gear 82A meshes with the focus gear 28, the zoom drive gear 84A meshes with the zoom gear 50, and the iris drive gear 86A meshes with the iris gear 62, respectively. Further, the pressing pin 76 is inserted into the insertion hole 74 to press the click spring 72 and retreat from the click 70.

The operation of the lens apparatus for a camera according to the present embodiment having the above-described structure is as follows. First, a case where the aperture is manually adjusted will be described. in this case,
The TV 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 click spring 72 is released from the restriction by the pressing pin 76 and pressed against the click 70 as shown in FIG. .

In this state, when the camera operator rotates the iris ring 54 to adjust the aperture, the click spring 72 is clicked every time the iris ring 54 rotates.
The iris ring 54 is locked with a click. Thus, it is possible to prevent the iris ring 54 from rotating and changing the aperture value due to vibration or the like. Also, the click response is a guide when adjusting the aperture.

Next, a case where the aperture adjustment is performed automatically will be described. In this case, the TV lens 10 is used with the drive unit 78 attached. The drive unit 78 is mounted on the lens barrel 12 of the television lens 10 via screws (not shown). When the drive unit 78 is mounted on the lens barrel 12, the focus drive gear 82A
In addition, the zoom drive gear 84A is connected to the zoom gear 50,
The iris drive gear 86A meshes with the iris gear 62, respectively. At the same time, the pressing pin 76 provided on the drive unit 78 is inserted into the insertion hole 74.

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. As a result, the click spring 72 is forcibly retracted from the click 70. Let me do. Therefore, even if the iris drive motor 86 is driven in this state, no load is applied to the iris drive motor 86 by the click mechanism.

As described above, according to the aperture device of the present embodiment, the click mechanism can be operated only at the time of manual operation, so that one TV lens 10 can arbitrarily perform manual operation and automatic operation. You can use them properly. In the present embodiment, the pressing pin 76 is provided in the drive unit 78, and when the drive unit 78 is mounted on the lens barrel 12, the pressing pin 76 automatically presses the click spring 72 and retreats from the click 70. Although it is configured so as to make it possible, it may be configured as follows.

That is, the insertion hole 74 is a screw hole, and the pressing pin 76 inserted into the insertion hole 74 is a bolt.
Then, the bolt is provided independently of the drive unit 78, and by screwing this bolt into the screw hole,
The click spring 72 is configured to be pressed and retracted from the click 70. Thus, even when the drive unit 78 is not mounted, the click mechanism can be optionally operated and released.

In the present embodiment, the case where the click 70 is formed on the iris ring 54 has been described. Can be selectively activated. Further, in the present embodiment, the case where the aperture mechanism 20 is provided with the click mechanism has been described, but the same can be applied to the case where the focus apparatus or the zoom apparatus is provided with the click mechanism.

[0031]

As described above, according to the camera lens device of the present invention, the member for releasing the connection between the fixed support mechanism and the operation ring allows the fixed support mechanism to be optionally operated and released. As a result, one lens can be used for manual operation and automatic operation.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a television lens for an ENG camera to which the present invention is applied.

FIG. 2 is an enlarged sectional view showing a main part of FIG. 1;

FIG. 3 is an enlarged sectional view showing a main part of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... TV 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 (2)

[Claims] 1. A lens device for a camera, wherein a fixed support mechanism for preventing the operation ring from rotating until an arbitrary rotation power is applied to the operation ring of the camera lens, wherein the operation ring and the fixed support mechanism are provided. A lens device for a camera, comprising a release member for releasing the connection with the camera. 2. The method according to claim 1, wherein the release member is provided on a drive unit that drives the operation ring with a motor, and detaches the connection between the operation ring and the fixed support mechanism by mounting the drive unit on a lens body. The lens device for a camera according to claim 1, wherein: