CN2710008Y - Long-short automatic focus camera - Google Patents

Abstract

The utility model relates to a long-short automatic focus camera which is used in the monitor camera. The utility model comprises a camera lenses, an image acceptance unit, an illuminating apparatus and a light sensitive module, which are arranged inside a container crust. And the camera lenses orderly comprises a first concave-convex lens, a second concave-convex lens, a third concave lens, and a fourth convex lens. The curvature radius of the image-fetching side both the first concave-convex lens and the second concave-convex lens is smaller than the curvature radius of the image-forming side; the curvature radius of the image-fetching side of the third concave lens is greater than the curvature radius of the image-forming side; both sides of the fourth convex lens has the same curvature radius. Because of the structure design, after the camera lenses of the utility model is assembled, the objective image is direct transferred to the invigilator through accepted by the image acceptance unit to display clear image without any actions of focus alteration. So, the utility model can reduce the product cost and can also reduce the integral volume to improve the business competitive strength of products.

Description

The far and near full-automatic video camera that focuses on

Technical field

The utility model is automatically to focus on video camera about a kind of distance, is meant far and near full-automatic the focus on video camera of a kind of use on monitoring camera especially.

Background technology

The general use at the monitoring camera that monitors the place situation possesses the lens group that the focal length that can stretch is adjusted mostly, image process unit group and image receiving element group, wherein, the excellence of traditional monitoring camera depends on lens group mostly, and the quality factor of decision camera lens is the eyeglass number, the eyeglass transmittance, coating and grinding, and mechanical hook-up, and in order to reach the purpose of zoom capture, mechanical hook-up is a most important driver element in the lens group structure normally, utilize a such driver element, make various eyeglass in the lens group be carried out the variation between focal length, reach the purpose of clear capture.

But the driving circuit that its action of driving of must arranging in pairs or groups mostly is set of above-mentioned mechanical hook-up, and the shared volume of the circuit board of driving circuit and mechanical hook-up itself is quite big, make that general monitoring camera volume can't be dwindled, in addition, driving circuit that installs additional and mechanical hook-up will cause the increase of monitoring camera cost of manufacture, cause the monitoring camera price to descend and are popularized.

The utility model content

The purpose of this utility model just is to improve above-mentionedly commonly uses the structural ectrogeny of monitoring camera, thereby a kind of far and near full-automatic video camera that focuses on that does not need mechanical hook-up just can reach autozoom capture purpose is provided.

In order to achieve the above object, the utility model adopts following technical scheme: full-automatic focusing video camera of the present utility model comprises lens group, image receiving element group, lighting device and the illuminant module that is arranged in the ccontaining housing, it is characterized in that:

This lens group comprises first concave-convex lens, second concave-convex lens, the 3rd concavees lens and the 4th convex lens of arranging in regular turn; Wherein, this first concave-convex lens and second concave-convex lens are in the radius-of-curvature of the capture thing side radius-of-curvature less than the imaging side; The 3rd concavees lens are biconcave lens, and it is in the radius-of-curvature of the capture thing side radius-of-curvature greater than the imaging side; The 4th convex lens are biconvex lens, and its both sides have identical curvature.

The effect of the eyeglass of first concave-convex lens is into light when eyeglass, draw short its directional light and focus on second concave-convex lens and the eyeglass of the 3rd concavees lens on; The eyeglass of the 4th convex lens act as the removing aberration, also be about to light-inletting quantity and do suitable adjustment with optical path, make illuminant module obtain accurately and image clearly.

Design by said structure, after in a single day lens group of the present utility model is assembled and is finished, without any need for focal length change action, promptly image can be received via image receiving element group and directly be sent to the monitor place and be shown sharp image, the mechanical hook-up that not only can save driving lens group zoom is to reduce cost of manufacture, more can dwindle overall volume, to promote the commercial competitiveness of product.

Description of drawings

Fig. 1 automatically focuses on the structural representation of the lens group of video camera for distance of the present utility model.

Embodiment

Principal character of the present utility model is the structure of lens group, its only need to utilize 4 eyeglasses just can so that the capture object of long distance or low coverage via illuminant module CCD or CMOS blur-free imaging in addition, this phenomenon is just like the mankind's retina neural system, the readability of the thing of " robotization " adjustment capture completely, also just like telescopical user mode, in case after the focal length adjustment finished, in certain distance range, no matter far and near object all can be discerned clearly.

Since image receiving element group, lighting device and the illuminant module of utility model all with commonly use structure in order to the reception image, provide throw light on and the structure of sensing luminosity identical, therefore is omitted explanation, the lens group that only shows with regard to the utility model feature is elaborated.

As shown in Figure 1, the lens group that distance of the present utility model automatically focuses on video camera comprises first concave-convex lens 10, second concave-convex lens 11, the 3rd concavees lens 12 and the 4th convex lens of arranging in regular turn 13, wherein, this first concave-convex lens 10 and second concave-convex lens 11 are in the radius-of-curvature of the capture thing side radius-of-curvature less than the imaging side;

The 3rd concavees lens 12 are biconcave lens, and it is in the radius-of-curvature of the capture thing side radius-of-curvature greater than the imaging side;

The 4th convex lens 13 are biconvex lens, and its both sides have identical curvature.

Wherein, the effect of first concave-convex lens 10 is to draw the directional light of short capture thing, and it is focused on second concave-convex lens 11 and the 3rd concavees lens 12, image is converged whole to the image receiving element via the 4th convex lens 13 again.

Wherein the arrangement of each eyeglass of lens group is provided with according to physical lens imaging theory, that is:

$\frac{1}{v}+\frac{1}{u}=f$

F=focal length wherein; The u=object distance; The v=image distance.

The combination of each eyeglass is with object distance=image distance, and thing is grown=arranged as long light projection principle.

For example, when object beyond two focus length, then imaging promptly has the phenomenon of dwindling; When object on two focus length, imaging then can be as the object size; When the object position between one times of focal length and two focus length, then imaging will be exaggerated; When object was on one times of focal length, the imaging meeting at infinity; Object then only has the virtual image in one times of focal length; And when object at infinity the time, imaging just can drop on the focus place.

First concave-convex lens, 10 center thicknesses in the present embodiment are 5.1 ± 0.1mm, are 14.155 in the curvature of capture thing side, and the curvature of opposite side is 201.8.

Second concave-convex lens, 11 center thicknesses are 3.1 ± 0.1mm, are 10.544 in the curvature of capture thing side, and the curvature of opposite side is 17.298.

The 3rd concave mirror 12 center thicknesses are 0.7 ± 0.1mm, are 731.1 in the curvature of capture thing side, and the curvature of opposite side is 7.691.

The 4th convex lens 13 center thicknesses are 3.5 ± 0.1mm, and the curvature of its both sides is 21.33.

The central point minimum distance of first concave-convex lens 10 and second concave-convex lens 1 is 0.1 ± 0.1mm, the central point minimum distance of second concave-convex lens 11 and the 3rd concavees lens 12 is 1.27mm, the central point minimum distance of the 3rd concavees lens 12 and the 4th convex lens 13 is 5.4 ± 0.1mm, and the 4th convex lens 13 central points and image receiving element apart from 12.64mm.

Through facts have proved, distance of the present utility model automatically focuses on video camera, and setting completed at each lens of lens group, after the i.e. distance decision, do not need to rechange the relative distance between each lens, all can obtain image clearly, provable thus, lens group of the present utility model no longer needs the mechanical hook-up of any zoom, promptly can obtain image clearly, the circuit that so not only can save mechanical hook-up, drive mechanism is to reduce manufacturing cost, can reduce overall volume because of the minimizing of part again, make competitiveness of product be promoted.

Claims (6)

1, a kind of distance automatically focuses on video camera, comprises the lens group, image receiving element group, lighting device and the illuminant module that are arranged in the ccontaining housing, it is characterized in that:

This lens group comprises in regular turn first concave-convex lens, second concave-convex lens, the 3rd concavees lens and the 4th convex lens of arranging, and wherein, this first concave-convex lens and second concave-convex lens are in the radius-of-curvature of the capture thing side radius-of-curvature less than the imaging side;

The 3rd concavees lens are biconcave lens, and it is in the radius-of-curvature of the capture thing side radius-of-curvature greater than the imaging side;

The 4th convex lens are biconvex lens, and its both sides have identical curvature.

2, distance as claimed in claim 1 automatically focuses on video camera, it is characterized in that, the first concave-convex lens center thickness is 5.1 ± 0.1mm, is 14.155 in the curvature of capture thing side, and the curvature of opposite side is 201.8.

3, distance as claimed in claim 1 automatically focuses on video camera, it is characterized in that, the second concave-convex lens center thickness is 3.1 ± 0.1mm, is 10.544 in the curvature of capture thing side, and the curvature of opposite side is 17.298.

4, distance as claimed in claim 1 automatically focuses on video camera, it is characterized in that, the 3rd concave mirror center thickness is 0.7 ± 0.1mm, is 731.1 in the curvature of capture thing side, and the curvature of opposite side is 7.691.

5, distance as claimed in claim 1 automatically focuses on video camera, it is characterized in that, the 4th convex lens center thickness is 3.5 ± 0.1mm, and the curvature of its both sides is 21.33.

6, distance as claimed in claim 1 automatically focuses on video camera, it is characterized in that, the central point minimum distance of first concave-convex lens and second concave-convex lens is 0.1 ± 0.1mm, the central point minimum distance of second concave-convex lens and the 3rd concavees lens is 1.27mm, the central point minimum distance of the 3rd concavees lens and the 4th convex lens is 5.4 ± 0.1mm, and the 4th convex lens central point and image receiving element apart from 12.64mm.

Images