KR101406157B1 - Window Assembly For CCTV Camera - Google Patents

Abstract

It is possible to prevent the vignetting phenomenon commonly occurring in a wide angle CCTV camera installed in a narrow space and to prevent the infrared light irradiated from the LED from entering the camera lens to prevent the image quality from being deteriorated, Lt; / RTI > A main body portion having a lens portion in the center and a plurality of LEDs mounted on an edge thereof; A window portion mounted on the front of the body portion and configured by a window for a lens positioned on a front surface of the lens portion and a window for an LED located on a front surface of the LED and disposed around the lens window; And a lens barrel which is provided between the lens part and the LED and blocks the light of the LED from being introduced into the lens part. In order to support a part of the front surface of the LED window, And a second support step extending to support a part of the bottom surface of the lens window is formed on the inner side surface of the lens barrel so as to be interfered with within the imaging angle of the lens part .

Description

[0001] The present invention relates to a window assembly for a CCTV camera,

The present invention relates to a window assembly for a CCTV camera, and more particularly to a window assembly for a CCTV camera, which prevents infra-red light emitted from an LED from entering the camera lens to prevent image quality from being deteriorated, A window assembly of a CCTV camera in which a vignetting phenomenon (a phenomenon in which edges or outer portions of an image photographed due to a decrease in the light amount at the periphery of the lens or darkness is obscured or blacked out) often occurs in a wide angle CCTV camera will be.

Generally, a CCTV camera is provided with a lighting means so that it can be photographed even at night. At this time, infrared LED is widely used as a lighting device of a CCTV camera. The body of such a CCTV camera has been attempted to separate the camera lens and the LED from the light shielding wall so that the LED light is prevented from being directly incident on the camera lens.

However, a waterproof type CCTV camera is equipped with a transparent window to transmit the light of the LED in front of the subject in the front direction, to allow the image to be incident through the lens from the subject, and to protect the inside of the camera. The light is reflected by the front window and penetrated into the camera lens, thereby deteriorating the quality of the image. In order to solve this problem, various types of window assemblies have been disclosed.

1 is an exemplary view illustrating a conventional window assembly of a CCTV.

The front part of the CCTV camera in which the window is installed includes a window assembly composed of a main body 1 in which an LED 2 and a camera lens 3 are installed, an upper ring 14, a lower ring 18, and a window part 10, A fixing ring 6 for fixing the assembly to the main body 1 and a waterproof O-ring 5 sandwiched between the window and the fixing ring 6. [

The main body 1 is formed with an LED 2 and a camera lens 3, and the LED 2 provides illumination light to a subject. The periphery of the camera lens 3 is surrounded by the circumferential shielding wall 4 to prevent the LED 2 light generated in the LED 2 from penetrating into the camera lens 3. [

The window assembly functions to protect the LED 2 and the camera lens 3 of the main body 1 and includes an upper ring 14 coupled to the upper surface of the window assembly 10 and a lower ring 14 coupled to the lower surface of the window assembly 10. [ And a lower ring (18).

The retaining ring 6 is coupled to the body 1 and serves to secure the window assembly 10 to the body 1 such that the window assembly 10 maintains its original position in the body 1. The waterproof o-ring 5 functions to maintain the airtightness between the stationary ring 6 and the window assembly 10, thereby preventing moisture and the like from penetrating into the window assembly 10 from the outside.

FIG. 2A is a state diagram showing an angle of view for an example of a conventional window assembly, and FIG. 2B is a state diagram showing a vignetting shape generated around a photographed image.

2A and 2B, a conventional window assembly has a lens window 11 disposed in front of a camera lens 30 and a window 12 for LEDs disposed in front of the LED 2, ) On the same line. At this time, a fixing portion 4a for fixing the windows 11 and 12 is formed at the tip of the light-shielding wall 4 so as to fix the front surfaces of the windows 11 and 12, The windows 11 and 12 are fixed to the back surface of the windows 11 and 12 by adhesion of the windows 11 and 12 and the light shielding wall 4 through the adhesive agent g. That is, the conventional window assembly is provided with a waterproof type and a light shielding part for blocking the inflow of light into the lens by LED illumination, And the like are disposed in front of the lens (these parts encroach on the imaging range of the lens).

However, it can be seen that the conventional window assembly interferes with the tip of the fixing portion 4a of the light-shielding wall 4 within the imaging angle of the lens as in Fig. That is, the fixed portion 4a formed at the tip of the light-shielding wall 4 is provided with extended regions A and B for fixing the lens window 11. However, the regions A and B are extended to the inside of the imaging angle of the lens, thereby preventing the light from being incident on the periphery of the maximum imaging angle of the lens. As a result, a phenomenon in which a light quantity is reduced or blackened (a so-called vignetting phenomenon) occurs in a peripheral portion of the photographed image. That is, the maximum imaging angle (maximum angle of view) '?' At the wide angle side of the lens and the maximum effective angle of view allowed by the conventional window assembly is? 2,?>? 1, Vignetting occurs in the range (regions A and B)

This peripheral blurring phenomenon causes vignetting (V1) around the photographed image 15 as shown in FIG. 2B, thereby deteriorating the image quality. This is a problem in that the peripheral vignetting phenomenon becomes more serious in a wide-angle CCTV installed in a narrow space (an elevator, an indoor space, etc.) as the imaging angle becomes wider as the wide-angle lens becomes wider.

The present invention has been made in view of the above-described need, and it is an object of the present invention to provide an image display apparatus and a display apparatus which can prevent infra-red light emitted from an LED from entering into a camera lens to deteriorate image quality, The present invention provides a window assembly of a CCTV camera in which a vignetting phenomenon commonly occurs in a camera is removed.

According to an aspect of the present invention, there is provided a light emitting device comprising: a body portion having a lens portion at a center and a plurality of LEDs at an edge; A lens window 11 mounted in front of the main body 50 and positioned at a front surface of the lens unit 30; A window portion (11, 12) composed of a window (12) for an LED disposed in the window; And a lens barrel (40) installed between the lens part (30) and the LED (20) to block the light of the LED from entering the lens part (30) A first support step (41) extending only toward the LED window (12) is formed to support a part of the front surface of the window (12), and the inner surface of the lens barrel A second support step 42 is formed extending to support a part of the lens unit 30 so as to prevent interference with the lens unit 30 within an imaging angle.

The first supporting step 41 of the barrel part 40 is formed at a right angle to the tip of the barrel part and the second supporting step 42 is formed in a direction opposite to the first supporting step 41 .

The first supporting step 41 and the second supporting step 42 of the barrel part 40 may be coupled to the window part through the adhesives g1 and g2 in a sealed state.

The lens window (11) and the LED window (12) may be arranged at the same height on a plane.

According to the present invention, since the lens window can be installed without vignetting interference within the angle of view of the lens portion, a sufficient amount of light can be secured even at the peripheral portion of the lens, and the image quality of the peripheral portion of the photographed image can be greatly improved have.

Further, according to the present invention, the window portion is supported by the first supporting step and the second supporting step in the vertical direction, and the sealed state is maintained through the adhesive, so that the fixed state can be maintained even under external pressure, There is an effect that can be.

1 is an exemplary view illustrating a conventional window assembly of a CCTV,
Figure 2a is a state diagram illustrating the angle of view of a conventional window assembly;
FIG. 2B is a state diagram showing a vignetting shape generated around the photographed image,
FIG. 3 is a state diagram illustrating a state in which a window assembly is mounted on a window assembly of a CCTV according to an exemplary embodiment of the present invention.
4 is a cross-sectional view illustrating a configuration of a window assembly of a CCTV according to an exemplary embodiment of the present invention, and FIG.
5 is an exemplary view illustrating the effective imaging angle of a window assembly of a CCTV according to an embodiment of the present invention, and
FIG. 6 illustrates an example of a comparison between effective imaging angles of a window assembly of a CCTV and a conventional window assembly according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The specific features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

FIG. 3 is a state diagram showing a state where a window assembly of a CCTV is assembled according to an embodiment of the present invention, FIG. 4 is a sectional view showing the construction of a window assembly of a CCTV according to an embodiment of the present invention, FIG. 5 is an exemplary view illustrating an effective imaging angle of a window assembly of a CCTV according to an exemplary embodiment of the present invention.

3, the window assembly of the CCTV of the present invention includes window portions 11 and 12, an LED 20, a lens portion 30, window portions 11 and 12, a barrel portion 40, and a body portion 50 ).

The window units 11 and 12 include a lens window 11 and a window 12 for LED. The lens window 11 is positioned on the front surface of the lens unit 30 and the LED window 12 is positioned on the front surface of the LED 20. Also, as shown in FIG. 3, it is preferable that the LED windows 12 are arranged on the same line (height) in the periphery of the lens window 11, but they may be disposed so as to have a difference in height.

On the other hand, the outer circumferential side of the LED window 12 can be sealed by interposing an O-ring O (FIG. 3) between the body 50 and the outer circumference side. The O-ring O can be employed in consideration of the waterproof performance.

Further, the LED window 12 and the lens window 11 are provided with the lens barrel 40 interposed therebetween. The barrel unit 40 is installed between the lens unit 30 and the LED 20 to block the light from the LED unit 20 from entering the lens unit 30, thereby preventing image quality degradation due to light interference of the LED unit.

Specifically, as shown in Figs. 3 and 4, the barrel portion 40 has a first support step 41 and a second support step 42 at a predetermined distance from the tip end thereof.

Here, the first support step 41 extends toward the LED window 12 so as to support a part of the front surface of the LED window 12 (the inner circumferential surface side). In other words, the first support step 41 does not have a portion extending toward the lens window 11, and does not affect the imaging angle of view of the lens unit 30. [

On the other hand, the second support step 42 is provided to support the bottom surface of the lens window 11. In other words, the lens window 11 extends in a direction opposite to the extending direction of the first support step 41 and is provided to support an external pressure exerted from the outside.

The lens window 11 is provided in a state of being sealed through the adhesive g1 on the back surface of the first support step 41 (Outer surface of the tip of the lens barrel) of the lens barrel 42 through the adhesive g2.

Since the window portions 11 and 12 are sealed in the barrel portion 40 and the main body 50, the waterproof performance can be secured.

FIG. 5 is a view illustrating an effective imaging angle of a window assembly of a CCTV according to an embodiment of the present invention. FIG. 6 is a view illustrating an effective imaging angle of a window assembly of a CCTV and a conventional window assembly according to an embodiment of the present invention. Fig. In Fig. 5, [theta] is the maximum imaging angle of view of the lens, and [theta] 2 refers to the maximum effective angle of view allowed by the window assembly according to the present invention.

That is, the lens window 11 can be provided within the maximum image capture angle? Of the lens unit 30 without exposing the first support step 41. Accordingly, it is possible to prevent a peripheral blur (vignetting phenomenon) caused by the fixing portion of the lens window 11 in the related art. In other words, the angle of view angle caused by vignetting can be prevented by matching the maximum imaging angle of view '?' Of the lens with the maximum effective angle of view '? 2' allowed by the window assembly of the present invention.

6, in order to fix the lens window 11, the tip end of the lens barrel 40 is provided in a shape of '┳' so that a conventional effective angle of view (maximum angle of view at which no vignetting phenomenon occurs) In the present invention, since the tip of the lens barrel 40 is formed of "?, " it is possible to suppress the light interference at the tip of the lens barrel 40 to secure a wide effective angle of view? The angle of view angle can be improved by matching with the maximum imaging angle of view '?' Unique to the lens.

Accordingly, the window assembly of the present invention can provide an excellent image without vignetting particularly in a CCTV employing a wide-angle lens. That is, a sufficient amount of light can be secured even at the peripheral portion of the lens, thereby reducing the deterioration or blurring of the image quality of the peripheral portion of the photographed image.

While the present invention has been particularly shown and described with reference to the particular embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

11: lens window 12: LED window
20: LED 30:
40: barrel portion 41: first support jaw
42: second supporting chin 50: main body
?: Maximum imaging angle of the lens? 1: Effective angle of view
? 2: effective angle of view of the present invention

Claims (4)

A main body portion having a lens portion in the center and a plurality of LEDs mounted on an edge thereof;
A window portion mounted on the front of the main body portion and configured to be positioned on a front surface of the lens portion; a window portion disposed on a front surface of the LED and separated from an LED window disposed around the lens window; And
And a barrel installed between the lens unit and the LED to block light from the LED from entering the lens unit,
A first support protrusion extending only to the LED window is formed at the tip of the lens barrel to support a part of the outer surface of the LED window and a part of the bottom surface of the lens window is fixed to the inner surface of the lens barrel And a second support step extended to support the lens assembly to prevent the peripheral part from interfering with the imaging angle of the lens part, The method according to claim 1,
Wherein the first supporting step of the lens barrel is formed at a right angle to the front end of the barrel, and the second supporting step is formed in a direction opposite to the first supporting step. 3. The method according to claim 1 or 2,
Wherein the first supporting jaws and the second supporting jaws of the barrel portion are coupled to the window portion in a sealed state through an adhesive agent. The method according to claim 1,
Wherein the lens window and the LED window are disposed at the same position on a plane.

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