JP4700858B2 - Operating device, photographing lens system, and camera system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an operation device that can be rotated, and more particularly, to an imaging lens system and a camera system that use this operation device for driving an imaging optical system.
[0002]
[Prior art]
A zoom operation device called a zoom demand or the like is connected to a photographing lens device used in a television camera system or the like. In this zoom demand, the photographer rotates the thumb ring from the middle point (neutral position) to the tele and wide directions with the thumb of his hand, and outputs an electrical signal corresponding to the direction and amount of operation. The zoom position can be controlled by inputting to the lens device.
[0003]
In addition, the zoom demand is such that a midpoint return torque (midpoint return force) acts so that the thumbling automatically returns to the midpoint when the photographer removes his hand from the thumbring that was rotating. It is configured.
[0004]
Here, the midpoint return mechanism of the thumb ring in the conventional zoom demand will be described.
[0005]
FIG. 8A shows a conventional zoom demand midpoint return mechanism. In this figure, reference numeral 101 denotes a potentiometer, which is fixed to the demand main body 103 with screws 104 by several presser fittings 102. Further, the input shaft 101 a of the potentiometer 101 is connected to the coupling 106 by a set screw 5.
[0006]
A grip 107 is fixed to the demand main body 103 with a screw 108, and a camshaft 109, one end of which is fixed to a coupling 106 with a set screw 105, is fitted into an inner diameter portion of the grip 107, and is held rotatably. Has been.
[0007]
As shown in FIG. 8D showing the AA cross section in FIG. 8A, a rotating piece 110 is fastened and fixed to the camshaft 109 with a screw 111. Further, a thumb ring 112 is attached to the rotating piece 110 with a screw. It is fixed at 112A. Therefore, the rotational operation force applied to the thumb ring 112 is transmitted from the rotary piece 110 to the camshaft 109 to the coupling 106 to the potentiometer input shaft 101a.
[0008]
Further, as shown in FIG. 8B, which shows a BB cross section in FIG. 8A, the cam section 109 has a substantially heart-shaped cross section provided in the recess of the cam portion 109a. A cam follower 113 fixed to the child 114 abuts.
[0009]
As shown in FIG. 8 (c) showing a CC cross section in FIG. 8 (a), the rotor 114 is a shaft fitted into a bearing stand 115 fixed to the inner diameter portion of the grip 107 with screws 117. 116, the rotor 114 can move like a pendulum about the shaft 116 as a rotation axis.
[0010]
Further, the other end of the rotor 114 is in contact with the spring receiver 118, and a compression coil spring 119 is disposed between the opposite surface of the spring receiver 18 and the lid 120 fixed with screws to the grip 107.
[0011]
In the zoom demand having such a structure, FIG. 8A shows a state where the thumb ring 112 is not operated at all (the middle point state).
[0012]
9 (a) to 9 (c), the entire zoom demand, the EE cross section, and the D-, respectively, in a state where the operator applies a rotational force to the thumb ring 112 with a finger to rotate the camshaft 109 by an angle φ. D section is shown.
[0013]
In this state, the cam follower 113 of the rotor 114 is pushed in while sliding along the convex portion from the concave portion of the cam portion 109 a, and the rotor 114 rotates around the shaft 116. Thus, the spring receiver 118 is pushed in while compressing the compression coil spring 119.
[0014]
The rotational force applied to the thumb ring 112 by the operator is represented by a value of k · Δ1 (where k is a spring constant) when the compression coil spring 119 is contracted by Δ1 from the middle point state.
[0015]
Accordingly, when the force applied to the thumb ring 112 by the operator is released, the thumb ring 112 returns to the original state, that is, the midpoint position.
[0016]
In such a structure, the input of the rotational force to the thumb ring 112 is transmitted to the input shaft 101a of the potentiometer 101 via several members as described above, so that a necessary electrical signal output can be obtained. .
[0017]
Further, the midpoint return torque of the thumb ring 112 can be adjusted by changing the initial tension of the compression coil spring 19. By increasing / decreasing the midpoint return torque, it is possible to set the operation force necessary for operating the thumb ring 112 (overcoming the midpoint return torque) to the photographer's preference.
[0018]
[Problems to be solved by the invention]
However, in the midpoint return mechanism configured as described above and capable of changing the midpoint return torque, the shape and configuration of the parts are complicated and the number of parts increases, so the size and the weight of the mechanism are increased. There is a problem that the cost becomes high because it is easy to perform and is difficult to assemble.
[0019]
An object of the present invention is to provide a lightweight, low-cost operating device, a photographing lens system and a camera system that can variably set the restoring force of an operating member such as a thumb ring with a simple configuration.
[0020]
[Means for Solving the Problems]
In order to achieve the above object, an operating device according to one aspect of the present invention is capable of rotating in a first direction and a second direction opposite to the first direction from a midpoint position around a rotation axis. An operation member; a first fixed end; and a first movable end that moves in the first direction by a rotation operation in the first direction from the operation member. A first torsion coil spring that elastically deforms as the first member moves in the first direction, and that applies an urging force generated by the elastic deformation to the operating member as a return force to the midpoint position; And a second movable end portion that moves in the second direction by a rotation operation in the second direction from the operation member, and the second movable end portion in the second direction. Elastically deforms with the movement of the actuator, and the biasing force generated by the elastic deformation is A second torsion coil spring that is applied to the member as a return force to the midpoint position; and initial elastic deformation of the first and second torsion coil springs when the operating member is located at the midpoint position. Return force setting means for variably setting the return force by changing the amount, wherein the return force setting means determines the position of the first or second fixed end in the first direction or the The return force is variably set by changing in the second direction .
[0022]
In the operating device according to the present invention, since the operating member and the movable end of the torsion coil spring can be connected by a simple rotation transmission mechanism, a return force is applied to the operating member with a simple configuration with a small number of parts. It becomes possible. In addition, the return force of the operating member can be adjusted by variably setting the initial elastic deformation amount of the torsion coil spring. For this reason, it is possible to realize an operating device having a function of automatically returning the operating member to the initial position (or midpoint position) and a returning force adjusting function with a small size, light weight and low cost.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
1 to 4 show the configuration of a zoom demand (operation device) according to the first embodiment of the present invention. FIGS. 2A and 2B show an enlarged view of the midpoint return mechanism in the zoom demand. 3 and 4 show the operation of the midpoint return mechanism.
[0024]
1 and 2, 1 is a demand body, and 2 is a thumb ring.
Reference numeral 3 denotes a potentiometer fixed to the demand main body 1. The input shaft 3a of the potentiometer 3 is coupled to the rear end portion of the shaft member 4 so as to be integrally rotatable with the shaft member 4.
Further, the shaft member 4 and the thumb ring 2 are connected so as to be integrally rotatable.
[0025]
A pin holding plate 18 is screwed to the tip end side of the shaft member 4 so as to be rotatable integrally with the shaft member 4, and an interlocking pin 5 is fixed to the lower end portion of the pin holding plate 18.
[0026]
In addition, the coil portions of the first and second torsion coil springs 11 and 12 are disposed on the outer periphery on the distal end side of the shaft member 4.
[0027]
As shown in FIG. 3A, fixed end side covers 7 and 8 are attached to the fixed end portions 11a and 12a side portions of the first and second torsion coil springs 11 and 12, and a movable end is also provided. Indexing plates 9 and 10 are attached to the portions 11b and 12b.
[0028]
Moreover, the index plates 9 and 10 have a cover part extending along the movable end parts 11b and 12b, and a pin contact part extending so as to form a bifurcated form with the cover part.
[0029]
The pin contact portions of the index plates 9 and 10 are in pressure contact with the interlocking pin 5 by an urging force for returning the movable end portions 11b and 12b generated by the elastic deformation of the torsion coil springs 11 and 12, respectively.
[0030]
Reference numeral 6 denotes a midpoint determination pin fixed to the demand main body 1, and the midpoint determination pin 6 is in contact with the pins of the index plates 9 and 10 in a midpoint state in which the thumb ring 2 shown in FIG. The parts abut.
[0031]
Reference numeral 13 denotes an adjustment screw rotatably fitted in a hole formed in the demand main body 1, and an external thread formed in the adjustment screw 13 has a female screw hole formed through the angle determining pin 14 in a radial direction. The parts are screwed together. The adjustment screw 13 is held by the demand main body 1 so as to rotate at a fixed position in the vertical direction of FIG. 1, and by rotating the adjustment screw 13, the demand screw 1 is formed in a groove formed to extend in the vertical direction. It is possible to move the angle determination pin 14 accommodated in the vertical direction.
[0032]
The operation of the midpoint return mechanism in the zoom demand configured as described above will be described with reference to FIGS. 3 and 4 show only the configuration and operation on the first torsion coil spring 11 side, except for FIG. 3A.
[0033]
As shown in FIG. 3A, the fixed ends 11a and 12a of the first and second torsion coil springs 11 and 12 are in contact with the angle determining pin 14 through the covers 7 and 8, and this contact is made. This state does not change even if the thumb ring 2 is operated.
[0034]
Assuming that the thumb ring 2 is rotated forward in FIG. 1 from the neutral state shown in FIG. An electrical signal corresponding to the corner is output. When the shaft member 4 is rotated, the interlocking pin 5 is rotated clockwise around the shaft member 4 as shown in FIG. 4A, and the index plate 9 is pushed by the interlocking pin 5 accordingly. Then, the movable end portion 11b of the first torsion coil spring 11 to which the index plate 9 is attached is also pushed and moved in the clockwise direction. As described above, since the fixed end portion 11a is fixed by contact with the angle determining pin 14, when the movable end portion 11b moves by the angle θ, the elastic deformation amount of the first torsion coil spring 11 also becomes the angle θ. Increase by a corresponding amount.
[0035]
When the operator removes his / her finger from the thumb ring 2, the first torsion coil spring 11 expands so as to return to its original position, and the movable end portion 11 b moves in the counterclockwise direction until the index plate 9 contacts the midpoint pin 6. To do. At this time, since the index plate 9 moves while pushing the interlocking pin 5, the urging force of the first torsion coil spring 11 is transmitted to the thumb ring 2 via the interlocking pin 5 and the shaft member 4, and the thumb ring 2 is returned to the middle position. Let
[0036]
When the thumb ring 2 is rotated in the back direction in FIG. 1, the interlocking pin 5 causes the index plate 10 and the movable end portion 12b of the second torsion coil spring 12 to move in the counterclockwise direction as shown in FIG. Push. Thereby, the amount of elastic deformation of the second torsion coil spring 12 increases. When the operator removes his / her finger from the thumb ring 2, the movable end 12 b of the second torsion coil spring 12 moves in the clockwise direction until the index plate 10 contacts the midpoint determination pin 6. At this time, since the index plate 10 moves while pushing the interlocking pin 5, the urging force of the second torsion coil spring 12 is transmitted to the thumb ring 2 via the interlocking pin 5 and the shaft member 4, and the thumb ring 2 is returned to the middle position. Let
[0037]
Further, when the adjusting screw 13 is rotated to move the angle determining pin 14 in the vertical direction, the angle determining pin 14 and the fixed end portions 11a and 12a (the fixed end side) of the first and second torsion coil springs 11 and 12 are fixed. The contact position with the covers 7 and 8) changes, and the spread (that is, the initial elastic deformation amount) in the midpoint state of the first and second torsion coil springs 11 and 12 changes.
[0038]
2 (b) and 3 (b), the angle determination pin 14 moves downward by L from the state of FIGS. 2 (a) and 3 (a), and the first and second torsion coil springs 11, 12 are shown. This shows a state in which the spread of the angle increases from the angle α to the angle β. As a result, the initial elastic deformation amount of the first and second torsion coil springs 11 and 12 is increased, acting on the thumb ring 2 positioned at the midpoint position and the thumb ring 2 operated as shown in FIG. 4B. Each point return force increases.
[0039]
On the contrary, when the angle determination pin 14 is moved upward from the state shown in FIGS. 2A and 3A, the spread of the first and second torsion coil springs 11 and 12 becomes small, and the first and second The initial elastic deformation amount of the torsion coil springs 11 and 12 becomes small, and the midpoint return force acting on the thumb ring 2 at each rotational position of the thumb ring 2 becomes small.
[0040]
(Second Embodiment)
FIG. 5 shows the configuration of the midpoint return mechanism of the zoom demand that is the second embodiment of the present invention. The present embodiment has basically the same configuration as that of the first embodiment, and components common to the first embodiment are denoted by the same reference numerals as those of the first embodiment. 5A and 5B show only the configuration on the first torsion coil spring 11 side.
[0041]
In the first embodiment, the initial elastic deformation amount of the first and second torsion coil springs 11 and 12 is changed by the vertical movement of the angle determination pin 14 interlocked with the adjustment operation of the adjustment screw 13, but in this embodiment, As shown in FIGS. 5A and 5B, the initial elastic deformation amount of the torsion coil springs 11 and 12 is changed by rotating the cam 15, and the midpoint return force acting on the thumb ring 2 is changed.
[0042]
(Third embodiment)
FIG. 6 shows the configuration of the zoom point midpoint return mechanism according to the third embodiment of the present invention. The present embodiment has basically the same configuration as that of the first embodiment, and components common to the first embodiment are denoted by the same reference numerals as those of the first embodiment.
[0043]
In the first embodiment, the initial elastic deformation amounts of the first and second torsion coil springs 11 and 12 are simultaneously changed by the same amount by the vertical movement of the angle determination pin 14 interlocked with the adjustment operation of the adjustment screw 13. In the embodiment, angle determining pins 16a and 16b that move up and down in conjunction with an adjusting operation of an adjusting screw (not shown) are provided for each torsion coil spring, and as shown in FIGS. 6 (a) and 6 (b), the first and The initial elastic deformation amounts of the second torsion coil springs 11 and 12 can be set individually.
[0044]
As shown in FIG. 6B from the state of FIG. 6A, only the initial elastic deformation amount of the first torsion coil spring 11 is reduced by lowering only the angle determining pin 16a on the first torsion coil spring 11 side by L. And the midpoint return force acting on the thumb ring 2 can be increased only during the rotation operation to one side.
[0045]
In the first to third embodiments, the case where the thumb ring 2 can be rotated in two directions from the midpoint position has been described. However, in the present invention, the operation member is rotated only in one direction from the initial position. It can also be applied to an operating device that can be used.
[0046]
FIG. 7 shows a camera system provided with the zoom demand. A zoom demand 16 is connected to a photographic lens 19 attached to the photographic camera 18 via a connection cable 17. When the zoom operation of the taking lens 19 is performed, the thumb ring 2 of the zoom demand 16 is operated so that an electric signal from the potentiometer 3 (not shown in FIG. 7) is transmitted to the taking lens 19 through the connection cable 17 and zoomed. Driving is performed. At this time, the operating force of the thumb ring 2 can be adjusted by operating the adjusting screw 13.
[0047]
【The invention's effect】
As described above, according to the present invention, since the operation member and the movable end of the torsion coil spring can be connected by a simple rotation transmission mechanism, the return force can be obtained with a simple configuration with a small number of parts. Can act on. Moreover, the return force of the operating member can be adjusted by variably setting the initial elastic deformation amount of the torsion coil spring. For this reason, it is possible to realize an operating device having a function of automatically returning to the initial position (or midpoint position) of the operating member and a returning force adjusting function with a small size, light weight and low cost.
[Brief description of the drawings]
FIG. 1 is a sectional view of a zoom demand according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of a midpoint return mechanism in the zoom demand.
FIG. 3 is an explanatory diagram of the midpoint return mechanism (midpoint state).
FIG. 4 is an explanatory diagram of the midpoint return mechanism (when the angle θ is operated).
FIG. 5 is an explanatory diagram of a midpoint return mechanism in a zoom demand that is the second embodiment of the present invention.
FIG. 6 is an explanatory diagram of a midpoint return mechanism in a zoom demand that is the third embodiment of the present invention.
FIG. 7 is a diagram showing a configuration of a camera system provided with the zoom demand.
FIG. 8 is a diagram illustrating a configuration of a conventional zoom demand.
FIG. 9 is a diagram illustrating an operation of a conventional zoom demand.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Demand body 2 Thumb ring 3 Potentiometer 4 Shaft member 5 Interlocking pin 6 Midpoint determining pin 7, 8 Cover plate 9, 10 Indexing plate 11, 12 Torsion coil spring 13 Adjustment screw 14, 16a, 16b Angle determining pin 15 Cam 16 Zoom demand 17 Connecting cable 18 Camera 19 Camera lens

Claims (9)

An operation member capable of being rotated in a first direction and a second direction opposite to the first direction from the midpoint position around the rotation axis ;
The first fixed end portion, said has a first movable end moved by the first direction of the rotational operation of the operation member in the first direction, the first of the first movable end A first torsion coil spring that elastically deforms with movement in the direction, and that imparts an urging force generated by the elastic deformation to the operating member as a return force to the midpoint position;
A second fixed end portion; and a second movable end portion that moves in the second direction by a rotation operation in the second direction from the operation member, wherein the second movable end portion is the second movable end portion . A second torsion coil spring that elastically deforms with movement in the direction, and that imparts an urging force generated by the elastic deformation to the operating member as a return force to the midpoint position;
Return force setting means for variably setting the return force by changing initial elastic deformation amounts of the first and second torsion coil springs when the operation member is located at the midpoint position ;
And have a,
The operating device , wherein the return force setting means variably sets the return force by changing the position of the first or second fixed end portion in the first direction or the second direction . 2. The operating device according to claim 1 , wherein the return force setting unit changes a position in a torsion direction of the fixed end portion of the torsion coil spring. The return force setting means includes a positioning member that positions the fixed end in the torsion direction, and an adjustment member that displaces the positioning member in a direction in which the position of the fixed end changes in the torsion direction according to an adjustment operation. The operating device according to claim 2 , wherein the operating device is provided. The operating device according to claim 3 , wherein the adjustment member is a screw member. The operating device according to claim 3 , wherein the adjustment member is a cam member. The return force setting means is provided for each of the first and second torsion coil springs, and the initial elastic deformation amounts of the first and second torsion coil springs can be individually set by the return force setting means. The operating device according to claim 1 , wherein: A photographic lens system comprising: the operating device according to claim 1; and a lens device that drives the photographic optical system based on a signal output from the operating device in accordance with an operation amount of the operating member. The photographing lens system according to claim 7 , wherein the operating device causes the photographing optical system to perform zoom driving. Camera system characterized by a photographic lens system according to claim 7 or 8, wherein the imaging lens is configured to have a camera mounted.

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