JPH07113941A - Monitoring camera - Google Patents

Abstract

PURPOSE:To provide the viewing angle for monitoring desired by a user with a simple structure by individually moving a variable power lens and a focusing lens, respectively. CONSTITUTION:A variable power lens 13 provided on the rear side of an objective lens 20 is supported freely movable in the direction of the optical axis 26 of the objective lens 20 and a variable lens moving means 14 for moving the variable lens 13 in the direction of the optical axis 26. The focusing lens 15 provided on the rear side of the variable power lens 13 is supported freely movable in the direction of the optical axis 26 and a focusing lens moving means 16 for moving the focusing lens 15 in the direction of the optical axis 26. Consequently, by moving the variable power lens 13 by the variable lens moving means 14 in the direction of the optical axis 26, the viewing angle for monitoring is adjusted and by moving the focusing lens 15 by means of the focusing lens moving means 16 in the direction of the optical axis 26, a light beam from an object is focused on an image pickup surface. Thus, since the moving means for moving the variable power lens 13 and the focusing lens 15 are separately provided, the constitution is simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance camera, and more particularly to a surveillance camera used to monitor a desired area.

[0002]

2. Description of the Related Art Conventionally, a surveillance camera used for observing a desired area is provided to a user in a state of a monitoring angle of view that meets the user's request. Then, it is set by selecting the monitoring angle of view and the optimum lens for the monitoring angle of view and incorporating the selected lens in the monitoring camera.

[0003]

However, if there is no lens that matches the desired angle of view, a lens that can obtain an angle of view close to the desired angle of view is selected and installed in the surveillance camera. There is a problem that the user cannot obtain a desired monitoring angle of view. The present invention has been made in view of such circumstances, and an object thereof is to provide a surveillance camera capable of obtaining a surveillance angle of view desired by a user with a simple structure.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an image pickup surface for subject light incident through an objective lens, a variable power lens, a focus lens and a relay lens provided on a lens barrel. In the surveillance camera focusing on the, the zoom lens has a zoom ring that is connected to the zoom lens and is movably provided on the outer periphery of the lens barrel in the optical axis direction. A zoom lens moving means for moving the zoom lens to the optical axis direction and a focus ring connected to the focus lens and rotatably provided on the outer periphery of the lens barrel. Focus lens moving means for rotating the focus ring to move the focus lens in the optical axis direction.

[0005]

According to the present invention, the variable power lens provided behind the objective lens is supported in a movable position in the optical axis direction of the objective lens. The variable-magnification lens moving means has a variable-magnification ring connected to the variable-magnification lens and movably provided on the outer periphery of the lens barrel, and the variable-magnification lens moves the variable-magnification ring in the optical axis direction to move the light. Moved axially. Further, a focus lens provided behind the variable power lens is supported in a moving position in the optical axis direction. The focus lens moving means has a focus ring connected to the focus lens and rotatably provided on the outer circumference of the lens barrel, and the focus lens is moved in the optical axis direction by rotating the focus ring. Therefore, the variable-magnification lens moving unit moves the variable-magnification lens in the optical axis direction to adjust the monitoring angle of view, and the focus lens moving unit moves the focus lens in the optical axis direction to focus the subject light on the imaging surface. .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a surveillance camera according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view of a surveillance camera according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.
As shown in FIG. 2, the surveillance camera 10 includes a main body 12, a zoom lens 13, a zoom lens moving unit 14, and a focus lens 1.
5 and the focus group moving means 16
An objective lens 20 is fixed to the tip of the second lens barrel 18. A first lens 22A is fixed in the lens barrel 18 via a lens frame 22.
A second lens 24 is fixed to the rear end of the lens 8. Then, the objective lens 20, the first and second lenses 22A, 2
4, each optical axis 26 is arranged coaxially. Further, shafts 28A and 28B are fixed in the lens barrel 18 in parallel with the optical axis 26.

A variable power lens frame 30 is slidably supported on the shafts 28A and 28B, and a variable power lens 13 is fixed to the variable power lens frame 30. Magnifying lens 13
Is arranged between the objective lens 20 and the first lens 22A, and the optical axis of the variable power lens 13 is arranged coaxially with the optical axis 26. The optical axis 2 is provided on the outer periphery of the variable power lens frame 30.
An elongated hole 30B extending in a direction orthogonal to 6 is formed (see FIG. 3), and the distal end portion of the variable power lens connecting pin 32 is loosely fitted in the elongated hole 30B. The variable power lens connecting pin 32 is fixed to the variable power ring 34 through a guide hole 18C formed in the lens barrel 18. That is, the screw 32 is provided near the head of the variable power lens connecting pin 32.
A is formed, and the screw 32A is screwed to the variable power ring 34 as shown in FIG. The variable magnification ring 34 is movably provided outside the lens barrel 18. In this way, the distal end portion of the variable power lens connecting pin 32 is loosely fitted in the long hole 30B of the variable power lens frame 30 to obtain the variable power lens connecting pin 3
Since 2 and the variable power lens frame 30 are connected, the variable power ring 34 and the variable power lens frame 30 are connected via the variable power lens connecting pin 32.
The precision for connecting and is relatively low.

The guide hole 18C is formed as an elongated hole extending parallel to the direction of the optical axis 26, and guides the variable power lens connecting pin 32 so as to move in the direction of the optical axis 26. Therefore, the variable power ring 34 moves in the direction of the optical axis 26 between the protrusions 18A and 18B. A fixing screw 36 is screwed to the variable power ring 34, and the fixing screw 36 is used as a handle when moving the variable power ring 34 in the direction of the optical axis 26. Further, by screwing in the fixing screw 36 and bringing the tip end into contact with the lens barrel 18, the variable magnification ring 34 is fixed to the lens barrel 18. Then, the fixing screw 36
Is moved in the direction of the optical axis 26 (the direction of arrow AA in FIG. 1), the variable power lens 13 is moved to the optical axis 26 via the variable power ring 34, the variable power lens connecting pin 32, and the variable power lens frame 30. Move in parallel. Thereby, the angle of view is adjusted. The variable-magnification lens connecting pin 32, the variable-magnification ring 34, and the like constitute the variable-magnification lens moving means 14.

Further, a focus lens frame 38 is slidably supported on the shafts 28A and 28B, and the focus lens 15 is fixed to the focus lens frame 38. The focus lens 15 is arranged between the first and second lenses 22A and 24, and the optical axis of the focus lens 15 is arranged coaxially with the optical axis 26. On the outer periphery of the focus lens frame 38, similarly to the variable power lens frame 30, there is an elongated hole 38B extending in a direction orthogonal to the optical axis 26.
Is formed, and the tip portion of the variable power lens connecting pin 32 is loosely fitted in the elongated hole 38B. The focus lens connecting pin 40 is fixed to the slider 42 via a guide hole 18D formed in the lens barrel 18 so as to extend in the direction of the optical axis 26.

That is, the connecting pin 4 for the focus lens
A screw 40A is formed on the head of 0, and the screw 40A
Are screwed to the slider 42. The slider 42 is formed in a ring shape, and is rotatably supported on the outside of the lens barrel 18 and movably supported in the direction of the optical axis 26. A male screw 42A is formed on the outer circumference of the slider 42. A female screw 46A is formed on the inner circumference of the focus ring 46 described above, and the male screw 42A of the slider 42 is screwed to the female screw 46A.

Therefore, when the focus ring 46 is rotated (in the direction of arrow BB in FIG. 1), the focus lens connecting pin 40 moves along the guide hole 18D via the slider 42, so that the focus lens 15 moves. It moves in the direction of the optical axis 26 via the focus lens frame 38. The slider 42, the focus lens connecting pin 40, the focus ring 46, and the like constitute the focus lens moving means 16. Further, in FIG. 2, 48 is a low-pass filter, 50 is an image pickup surface of an image pickup element, and 44 is a stopper, and the stopper 44 is fixed to the lens barrel 18 via a screw (not shown).

The operation of the surveillance camera according to the present invention constructed as described above will be described. First, the fixing screw 36 is moved parallel to the optical axis 26, and the variable power lens 1 is moved through the variable power ring 34, the variable power lens connecting pin 32, and the variable power lens frame 30.
3 is moved in parallel with the optical axis 26 to obtain a desired angle of view. After the desired angle of view is obtained, the fixing screw 36 is screwed in, the tip portion is brought into contact with the lens barrel 18, and the variable magnification ring 34 is fixed to the lens barrel 18.

Next, the focus ring 46 is rotated to move the focus lens connecting pin 40 along the guide hole 18D via the slider 42, and the focus lens 15 is moved to the optical axis 26 via the focus lens frame 38. Move in the direction. Then, the position of the focus lens 15 is adjusted so that the subject light focuses on the image pickup surface 50 of the image pickup element. After the adjustment is completed, similarly to the case of the variable power ring 34, a fixing screw (not shown) is screwed in, the tip end is brought into contact with the lens barrel 18, and the focus ring 46 is fixed to the lens barrel 18.

[0014]

As described above, according to the surveillance camera of the present invention, the magnification varying lens moving means moves the magnification varying lens in the optical axis direction to adjust the monitoring angle of view, and the focus lens moving means performs focusing. The lens is moved in the optical axis direction to focus the subject light on the imaging surface. In this way, the zoom lens moving means and the focus lens moving means are provided independently,
Furthermore, since the variable magnification ring of the variable power lens moving means is configured to move in the optical axis direction, it is possible to obtain the monitoring angle of view desired by the user with a simple structure.

[Brief description of drawings]

FIG. 1 is a perspective view of a surveillance camera according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged view of a main part of a surveillance camera according to the present invention.

[Explanation of symbols]

 10 ... Surveillance camera 13 ... Magnification lens 14 ... Magnification lens moving means 15 ... Focus lens 16 ... Focus lens moving means 18 ... Lens barrel 18C, 18D ... Guide hole 20 ... Objective lens 26 ... Optical axis 32 ... Magnification lens Connection pin 34 ... Variable magnification ring 40 ... Focus lens connection pin 42 ... Slider 46 ... Focus ring 46A ... Screw 50 ... Imaging surface

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location G03B 13/36 H04N 5/232 A 8411-2K G02B 7/11 N 8411-2K G03B 3/00 A

Claims (2)

[Claims] 1. A surveillance camera which focuses an object light incident through an objective lens, a variable power lens, a focus lens and a relay lens provided on a lens barrel on an image pickup surface, the monitoring camera being connected to the variable power lens. Along with it, a variable magnification ring is provided on the outer circumference of the lens barrel so as to be movable in the optical axis direction, and the variable magnification ring is moved in the optical axis direction to move the variable magnification lens in the optical axis direction. A zoom lens moving unit, and a focus ring connected to the focus lens and rotatably provided on the outer periphery of the lens barrel,
A surveillance camera, comprising: a focus lens moving unit that rotates the focus ring to move the focus lens in the optical axis direction. 2. The variable power lens moving means connects the variable power lens and the variable power ring, and the variable power lens is movably supported by a guide hole extending in the optical axis direction on the lens barrel. And a focus lens moving unit provided between the lens barrel and the focus ring, the slider being screwed to a screw formed on an inner circumference of the focus ring, and the focus lens. 2. The surveillance camera according to claim 1, further comprising: a focus lens connecting pin that is connected to the slider and the slider and is movably supported by a guide hole extending in the optical axis direction on the lens barrel.