JP2594208B2 - Camera attitude control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera attitude control device which is installed in a case such as an explosion-proof type, a wind-proof type or a waterproof type with a lens barrel facing a window of the case.

[0002]

2. Description of the Related Art FIG. 4 illustrates an installation structure of a camera in a conventional explosion-proof case and a method of controlling the attitude of the camera.

In the figure, K is a spherical explosion-proof case,
It is composed of a case body 1 and a lid 2 detachably screwed over an opening on the back surface thereof. Reference numeral 3 denotes a circular window provided on the front of the case body 1. The window 3 is formed by fitting a windshield 3b into a front opening 3a of the case main body 1 and fixing the windshield 3b to the case main body 1 with a holder 3c screwed thereto. The size is at most 1
It is about 00 mmφ. If it becomes larger than this, case K
This is because the explosion-proof function cannot be maintained.

[0004] C is a television camera (hereinafter referred to as a camera)
4 is the lens barrel. The camera C is located at the intersection of the optical axis k of the lens barrel 4 and the distal end surface of the lens barrel 4 and is located at the window 3,
That is , it is rotatable vertically about a point P on an axis m passing through the center of the windshield 3b. The position of the point P is set at a position close to the windshield 3b so that the monitor range of the camera C through the window 3 can be maximized.

The camera C is vertically rotated by a driving device (not shown), and the rotation angle θ is controlled by a control device (not shown).

Α is the angle of view of the camera C, a and b are the angle of view lines of the camera C, and θ is the rotation angle of the camera C with respect to the axis m. Reference numeral 5 denotes a mounting bracket for fixing the case K to a mounting table (not shown).

With such a structure, when controlling the attitude of the camera C, the driving device
Is rotated in the vertical direction, and the rotation angle θ at that time is arbitrarily set by the control device.

[0008]

However, in the conventional installation structure of the camera C in the explosion-proof case, as described above, the camera C is connected to the optical axis k of the lens barrel 4 and the distal end surface thereof. An axis m which is an intersection and passes through the center of the windshield 3b
Since the camera C is rotated in the vertical direction about the upper point P, the camera C is slightly rotated (by the rotation angle θ), and the angle-of-view lines a and b become the edges of the window 3. (Holder 3c). For this reason, there is a problem that the monitor range of the camera C cannot be widened.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and a camera attitude control device capable of expanding a monitor range of a camera installed in an explosion-proof type case or the like. The purpose is to provide.

[0010]

According to the camera attitude control device provided by the present invention , a circular window is provided at the front opening.
A lid that is detachably mounted on the case body and the rear opening
Become more spherical explosion-proof, wind-type, in the case of a waterproof type, such as, the camera is placed on a longitudinal axis passing through the center of the window, Jo Tokoro distance which upward direction with respect to the coaxial line and rotated by rotation angle in the upward direction Jo Tokoro want a moving only when rotated by a predetermined rotation angle downward while moving downward by a predetermined distance, the lens barrel of the camera is the window so as not to contact with, an attitude control system of a camera mounted in said casing, said shaft while the camera in the line is moved in front Symbol within a predetermined distance upward <br/> direction before the upward direction SL Rotate within a predetermined rotation angle , and within the predetermined distance in the downward direction.
While moved are those provided with a control means for rotating at the plant constant of rotation angle in a downward direction.

[0011]

[Action] In this invention, up or down while moving upward or downward direction of the camera in the case
Runode be rotated in the direction, the angle line of the camera can shake the wide angle through the window, thus, it is possible to increase the monitoring range of the camera.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows an installation structure of a camera in an explosion-proof case and a method of controlling its posture.

In FIG. 1, 1, 2, 3, 3a, 3b,
Reference numerals 3c, 4, 5, K, C, a, b, k, m, and α indicate the same parts as those in the conventional example shown in FIG. θ ₁ is windshield 3b
Rotation angle of the camera C to the axis m as a reference for, l ₂ camera
The moving distance of C in the vertical direction is shown. Camera C has window 3
The same window 3 with a certain distance l ₁ between it and the tip of the lens barrel 4
Is rotated in the vertical direction with the intersection point of the optical axis k of the lens barrel 4 facing the front end and the tip end surface of the lens barrel 4 as the rotation center P ₁ , and is rotated in the vertical direction with respect to the axis m while rotating . Each camera
C is moved by a half of the moving distance l ₂ of C.

[0015] The above a certain distance l _1, the camera C is the move
And within the dynamic range l ₂ in the vertical direction by rotation angle theta ₁ rotation is set to a size that is not in contact with the window 3 also.

FIGS. 2 and 3 show an attitude control device for moving the camera C installed in the case K while rotating it as described above. FIG. 2 is a side view, FIG.
Is a front view.

In both figures, reference numerals 6 and 7 denote brackets mounted in parallel on the upper and lower sides of a case K, 8 and 9 guide shafts mounted in parallel with the upper end fixed to the bracket 6 and the lower end fixed to the bracket 7, respectively. Is a base plate, which is attached to the guide shafts 8 and 9 via bearings 11 and is movable in the vertical direction.

A worm gear shaft 12 is mounted on the base plate 10 via a bearing 13 and is mounted in parallel with the guide shafts 8, 9. One end of the worm gear shaft 12 is fixed to the output shaft of the gear head 14, and the male screw 1 at the other end.
2a is screwed into a female screw (not shown) of the bracket 6. The gear head 14 is fixed to the bearing 13. 1
Reference numeral 5 denotes a motor, which is connected to the gear head 14.

Reference numeral 16 denotes a worm gear fixed to the worm gear shaft 12, and 17 denotes a worm wheel that meshes with the worm gear 16. Reference numeral 18 denotes a tilt shaft rotatably mounted on the base plate 10, and a worm wheel 17 and a camera mount 19 are integrally fixed on both sides of the base plate 10 with the base shaft 10 interposed therebetween. The camera C is mounted on the mount 19.

The relationship between the rotation angle of the camera C in the vertical direction and the amount of movement in the vertical direction is as follows. That is,
The motor 15 is rotated forward, as shown in FIG. 2, the camera C which is on the axis m, as shown in FIG. 1, the 1/2 · l ₂ is moved upward, the camera C is upwardly driven to Rotation angle θ ₁
And is set to the solid line position. By reversing the motor 15, as shown in FIG. 2, back to the axis m, from the same position, as shown in FIG. 1, it is moved by 1/2 · l ₂ downward, the camera C is driven to It is set to dashed line position pivoted by pivot shaft theta ₁ downward.

Reference numeral 20 denotes control means for controlling the forward / reverse rotation and rotation speed of the motor 15.

Next, the operation based on the above configuration will be described.

When the motor 15 is rotated forward by the control means 20 and the number of rotations corresponding to the rotation angle θ ₁ of the camera C is set, the camera C on the axis m rotates upward by the rotation angle θ _1. As well as upward by 1/2 · l ₂ . For this reason, the angle-of-view lines a and b of the camera C can be largely shaken downward without being blocked by the frame of the window 3.

Similarly, when the motor 15 is reversed and the number of rotations corresponding to the downward rotation angle θ ₁ is set, the camera C
Returns on the axis m, from which it rotates downward by the rotation angle θ _{1 and} moves downward by １ ／ · l ₂ . Therefore, the angle-of-view lines a and b of the camera C can be largely swung upward without being blocked by the frame of the window 3.

The above operation is performed when the camera C is swung up and down as much as possible. The camera C has the rotation angle θ
It goes without saying that optionally may have a range of movement amount l _{2 1} and.

In the above embodiment, the configuration in which the camera C is rotated in the vertical direction and simultaneously moved in the same direction has been described. However, if the attitude control device is set horizontally in the case K, C can be rotated in the left and right direction and at the same time moved in the same direction. In this case, the monitor range of the camera C in the left-right direction can be widened.

In the above-described embodiment, the configuration in which the camera C is rotated and moved in the vertical direction has been described. However, the configuration in which the camera C is rotated and moved along all the surfaces passing through the axis m is described. Can also be adopted.

In such a configuration, for example, a rotation shaft for rotating the base plate 10 around the optical axis k of the camera C is attached to the case K in FIGS. This can be realized by providing control means for controlling.

In the above embodiment, a television camera has been described as an example. However, the present invention is also applicable to a case where optical equipment such as a video camera, a camera, and a telescope is operated in a case. Can be similarly explained.

[0030]

As described above, according to the present invention, since the above-described configuration is employed, the monitor range of the camera installed in the explosion-proof type case or the like with the lens barrel facing the window of the case is provided. Can be widened.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an installation structure of a camera in an explosion-proof case and a method of controlling its posture according to an embodiment.

FIG. 2 is a side view of the camera attitude control device in FIG. 1;

FIG. 3 is a front view of the attitude control device of the camera shown in FIG. 2;

FIG. 4 is a longitudinal sectional side view showing a conventional camera installation structure in an explosion-proof case and a method of controlling its posture.

[Explanation of symbols]

 K Explosion-proof case C Television camera 3 Window 4 Lens barrel k Optical axis 6,7 Bracket 8,9 Guide shaft 10 Base plate 11,13 Bearing 14 Gear head 15 Motor 16 Worm gear 17 Worm wheel 18 Tilt axis

Claims (1)

(57) [Claims] 1. A case in which a circular window is provided in a front opening.
The main body and the lid that can be
In a spherical explosion-proof, wind-proof, or waterproof case
Camera on the longitudinal axis passing through the center of the window.
Location and which rotates only by a constant rotation angle of Tokoro upward direction while moving distance Jo Tokoro upward direction with respect to the coaxial line, the lower
A predetermined distance in the downward direction while moving the
When rotated by rotation angle as the lens barrel of the camera is not in contact with the window, an attitude control system of a camera mounted within the case, before the camera in the axis upward direction <br /> Symbol while moving within a predetermined distance by rotating the previous SL within a predetermined rotation angle upward direction, it is moved within the predetermined distance downward
Control to rotate downward within the predetermined rotation angle while rotating
Camera attitude control device characterized by comprising means.