JP4513214B2 - Wide angle photographing device and camera device using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wide-angle photographing apparatus that expands a photographing angle of view by being attached to a tip portion of a camera apparatus.
[0002]
[Prior art]
In recent years, surveillance cameras using CCD (charge coupled device) elements have become small and inexpensive, and have been used to visually monitor the state of the camera, which is attached to the entrance of a private house or attached to the rear of an automobile. Yes. In such a conventional surveillance camera, the front end portion has a flange portion, and by rotating the flange portion, the distance between the built-in lens and the CCD element is adjusted, and the subject image is focused on the CCD element. I have to.
[0003]
Some cameras send an image signal converted into an electrical signal by a CCD element to an external device for output. In addition, for example, an automatic cash machine (ATM) with such a monitoring camera built therein is being considered for use in monitoring the operation of a customer who operates the ATM in order to prevent troubles during 24-hour operation.
[0004]
[Problems to be solved by the invention]
However, it is difficult to take a wide-angle image with the surveillance camera as described above. The lens part of a small surveillance camera is generally designed exclusively for the camera, and the lens part cannot be exchanged even if wide-angle shooting is attempted according to the shooting specifications. Fisheye lenses that can shoot a wide area are expensive, and there are very few small surveillance cameras equipped with actual fisheye lenses. In a small surveillance camera, if a new lens capable of wide-angle shooting is newly developed, its development cost and development period will be required.
[0005]
Although it is conceivable that the lens of the surveillance camera can be exchanged, even if it can be exchanged, dust or dust may adhere to the lens during the exchange.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a wide-angle photographing device attached to a camera device having a lens fixing portion having a built-in lens portion and a rotatable flange portion fixed to the lens portion, comprising a plano-concave lens, A first position fixing portion for fixing the position of the plano-concave lens , and a positioning portion for positioning one end of the flange portion in a state where the position of the plano-concave lens is fixed to the position fixing portion. A fixing plate and a second fixing plate having a positioning portion on which the other end of the flange portion is positioned. The first fixing plate and the second fixing plate include the plano-concave lens and the second fixing plate. In the state where the flange portion is positioned, the flange portions are fixed so as to be removable from each other. In this state, the plano-concave lens can be rotated together with the flange portion.
[0007]
According to the present invention having the above-described configuration, the plano-concave lens is overlapped and fixed to the flange portion by the first fixing plate and the second fixing plate. There is no need to replace it. The plano-concave lens fixed by the first fixing plate and the second fixing plate can be easily exchanged, and by changing the plano-concave lens, it is possible to easily cope with the specifications for photographing.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a main part of a small surveillance camera to which a wide-angle photographing apparatus according to an embodiment of the present invention is attached, and FIG. FIG. 3 is a side view showing a small surveillance camera to which the wide-angle imaging device of the embodiment is attached.
[0010]
1, 2, and 3, the small surveillance camera 1 includes a flange portion 2, a lens fixing portion 3, and a control circuit portion 4. The lens fixing unit 3 includes a lens unit 5, and the lens unit 5 can be displaced with respect to the lens fixing unit 3 by a screw unit 6. A CCD element 7 is disposed in the control circuit unit 4 facing the lens unit 5. The flange portion 2 is fixed to the lens portion 5 and is rotatably provided. As the flange portion 2 rotates, the distance between the lens portion 5 and the CCD element 7 changes. Light entering from the flange portion 2 passes through the lens portion 5 and reaches the CCD element 7.
[0011]
A gap 8 is formed between the flange portion 2 and the lens fixing portion 3, and a leaf spring 9 is disposed in the gap 8. The leaf spring 9 presses the flange portion 2 and the lens fixing portion 3 away from each other.
[0012]
The wide angle photographing device 10 of the present invention is attached to the flange portion 2. The wide-angle imaging device 10 includes a lens mount 11, a front ring 12, and a plano-concave lens 13. The wide angle photographing device 10 rotates together with the flange portion 2, and the distance between the lens portion 5 and the CCD element 7 can be changed by rotating the wide angle photographing device 10. By attaching the wide-angle imaging device 10 in this way, when the plano-concave lens 13 having a focal length of f = -12 mm is attached, the focal length of the lens unit 5 having the focal length f = 3.5 mm before being attached is as follows. Changes to f = about 2.3 mm. That is, the angle of view of the small surveillance camera 1 can be changed to a wide angle.
[0013]
The plano-concave lens 13 is fixed in a state where it is overlapped on the flange portion 2 by the front ring 12. The front ring 12 covers the entire side surface of the plano-concave lens 13 and the upper side surface of the flange portion 2. Light does not enter from the direction. The lens mount 11 is attached so as to cover the lower peripheral surface of the flange portion 2, and a part of the lens mount 11 (a stepped portion 17 described later) enters the gap 8, and the above-described leaf spring 9 includes the part and the lens fixing portion. 3. The lens mount 11 and the front ring 12 are fixed by screws 14. The plano-concave lens 13 is also fixed to the flange portion 2 by this screwing.
[0014]
Next, details of each part of the wide-angle imaging device 10 will be described. 4 is a top view showing the lens mount, FIG. 5 is a side view showing the lens mount, and FIG. 6 is a bottom view showing the lens mount.
[0015]
4, 5, and 6, the lens mount 11 is formed with a U-shaped notch 16, and a stepped portion 17 is formed on the upper surface side of the lens mount 11 along the U-shaped notch 16. . The lower peripheral surface of the flange portion 2 is positioned on the step portion 17. A protrusion escape portion 18 is formed continuously with the stepped portion 17. The protrusion escape portion 18 is configured to receive a protrusion, which will be described later, formed on the flange portion 2. A chamfer 19 is formed at the end of the U-shaped notch 16.
[0016]
Leaf spring fixing grooves 20 are formed on both sides of the U-shaped notch 16 on the bottom surface side of the lens mount 11. Part of the above-described leaf spring 9 enters the leaf spring fixing groove 20. The lens mount 11 is formed with screw holes 21 at three locations.
[0017]
7 is a top view showing the front ring, FIG. 8 is a side view showing the front ring, and FIG. 9 is a bottom view showing the front ring.
[0018]
7, 8, and 9, a hole 22 is formed in the center of the front ring 12, and a step portion 23 is formed on the upper surface side of the front ring 12 over the entire periphery of the hole 22. The upper part 23a of the step part 23 has a shape capable of fixing the plano-concave lens 13 as shown in FIG. A step portion 24 is formed on the bottom surface side of the front ring 12 at a position facing the U-shaped notch portion 16 of the lens mount 11, and a positioning portion 25 for positioning the flange portion 2 is formed on the bottom surface portion of the step portion 23. Has been. A protrusion escape portion 26 is formed continuously with the positioning portion 25. The front ring 12 is formed with screw holes 27 at three locations.
[0019]
Next, a method for attaching the wide-angle photographing apparatus 10 will be further described with reference to FIGS. 10 and 11 are explanatory views showing a mounting method of the wide-angle photographing apparatus according to the embodiment. FIG. 10 shows a state where a lens mount is attached to the flange portion, and FIG. 11 shows a state where a plano-concave lens and a front ring are further attached. Indicates.
[0020]
First, the lens mount 11 is fitted into the lower portion of the flange portion 2. When the lens mount 11 is fitted, it is necessary to first change the posture of the leaf spring 9 and fit it into the leaf spring fixing groove 20 of the lens mount 11. When the lens mount 11 is fitted, the lens mount 11 is fitted so that the lens portion 5 between the flange portion 2 and the lens fixing portion 3 enters the U-shaped notch portion 16. At this time, since the chamfered portion 19 formed on the lens mount 11 can easily enter between the leaf spring 9 and the flange portion 2, the lens mount 11 can be easily fitted.
[0021]
The orientation of the leaf spring 9 is adjusted when the wide-angle photographing device 10 is rotated when the wide-angle photographing device 10 is rotated and the distance between the lens unit 5 and the CCD element 7 is adjusted. When the leaf spring 9 also rotates and the two contact points where the leaf spring 9 pushes the lens mount 11 enter the U-shaped notch 16 of the lens mount 11, the pushing force of the leaf spring 9 is biased. This is to prevent it. If the pressing force is biased, backlash occurs between the wide-angle imaging device 10 and the lens fixing unit 3, and focusing on the CCD element 7 is not successful. When the two contact points of the leaf spring 9 are fitted into the leaf spring fixing groove 20, the leaf spring 9 rotates with the rotation of the wide-angle imaging device 10 and the pressing force is not biased.
[0022]
When the lens mount 11 is fitted into the lower portion of the flange portion 2, the protrusion 2 a (FIG. 10) formed on the flange portion 2 enters the protrusion escape portion 18 of the lens mount 11. The lower peripheral surface of the flange portion 2 is in close contact with the stepped portion 17 of the lens mount 11.
[0023]
Next, the plano-concave lens 13 is fitted into the stepped portion 23 of the front ring 12 and fixed. The step portion 23 is formed to have substantially the same size as the outer diameter of the plano-concave lens 13, and the plano-concave lens 13 is fixed to the front ring 12 by being fitted into the step portion 23. Next, the front ring 12 to which the plano-concave lens 13 is fixed is attached so that the upper portion of the flange portion 2 enters the positioning portion 25 of the front ring 12.
[0024]
At this time, the protrusion 2 a formed on the flange portion 2 enters the protrusion escape portion 26 of the front ring 12. Further, as shown in FIG. 11, the step portion 24 of the front ring 12 enters the U-shaped notch portion 16 of the lens mount 11, and the position of the screw hole 27 coincides with the position of the screw hole 21 of the lens mount 11. Let Finally, the lens mount 11 and the front ring 12 are fixed by the screw 14 to complete the mounting.
[0025]
When exchanging the plano-concave lens 13 in accordance with the photographing specifications, it can be easily exchanged for a new plano-concave lens by removing the screw 14.
[0026]
【The invention's effect】
As described above in detail, according to the present invention, since the angle of view of the camera device can be changed to a wide angle simply by attaching the wide-angle imaging device to the flange portion of the camera device, it is necessary to develop a new lens. There is no need to disassemble the camera device. Therefore, the development cost and development period for lens development are not required. Further, since there is no need to disassemble the camera device, dust and dust do not enter the camera device.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a small surveillance camera to which a wide-angle imaging device according to an embodiment is attached.
FIG. 2 is a plan view showing a small surveillance camera to which the wide-angle imaging device of the embodiment is attached.
FIG. 3 is a side view showing a small surveillance camera to which the wide-angle imaging device of the embodiment is attached.
FIG. 4 is a top view showing a lens mount.
FIG. 5 is a side view showing a lens mount.
FIG. 6 is a bottom view showing a lens mount.
FIG. 7 is a top view showing a front ring.
FIG. 8 is a side view showing a front ring.
FIG. 9 is a bottom view showing the front ring.
FIG. 10 is an explanatory diagram illustrating a mounting method of the wide-angle imaging device according to the embodiment.
FIG. 11 is an explanatory diagram illustrating a mounting method of the wide-angle imaging device according to the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Small surveillance camera 2 Flange part 3 Lens fixing part 5 Lens part 9 Leaf spring 10 Wide angle imaging device 11 Lens mount 12 Front ring 13 Plano-concave lens

Claims (3)

A wide-angle photographing device attached to a camera device having a lens fixing portion incorporating a lens portion and a rotatable flange portion fixed to the lens portion ,
A plano-concave lens;
A first position fixing portion for fixing the position of the plano-concave lens , and a positioning portion for positioning one end of the flange portion in a state where the position of the plano-concave lens is fixed to the position fixing portion. A fixed plate,
A second fixing plate having a positioning portion on which the other end of the flange portion is positioned;
The first fixing plate and the second fixing plate are detachably fixed to each other with the plano-concave lens and the flange portion positioned, and the plano-concave lens can rotate together with the flange portion in this state. Wide-angle imaging device characterized by The wide-angle imaging device according to claim 1 , wherein a leaf spring is disposed between the lens fixing portion and the second fixing plate . In a camera device having a lens fixing part containing a lens part and a rotatable flange part fixed to the lens part,
A plano-concave lens;
A first position fixing portion for fixing the position of the plano-concave lens; and a positioning portion for positioning one end of the flange portion in a state where the position of the plano-concave lens is fixed to the position fixing portion. A fixed plate,
A second fixing plate having a positioning portion on which the other end of the flange portion is positioned;
The first fixing plate and the second fixing plate are detachably fixed to each other in a state where the plano-concave lens and the flange portion are positioned, and in this state, the plano-concave lens is rotatable with the flange portion. A camera apparatus characterized in that a photographing apparatus is provided.

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