CN216531507U - Lens structure for security protection of outdoor camera - Google Patents
Lens structure for security protection of outdoor camera Download PDFInfo
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- CN216531507U CN216531507U CN202123272714.2U CN202123272714U CN216531507U CN 216531507 U CN216531507 U CN 216531507U CN 202123272714 U CN202123272714 U CN 202123272714U CN 216531507 U CN216531507 U CN 216531507U
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Abstract
The utility model discloses a lens structure for security protection of an outdoor camera, which comprises a mirror body with an arc surface, wherein the projection of the mirror body is semicircular, and the mirror body is sequentially divided into an upper layer visual area, a middle layer visual area and a lower layer visual area; the upper layer visual area, the middle layer visual area and the lower layer visual area respectively comprise a plurality of lens units, and the lens units are lens sheets provided with Fresnel lines and focus on induction positions of the pyroelectric sensor of the outdoor camera. The utility model realizes the wide-angle detection induction range of the outdoor security system, meets the application requirement of intelligent security camera shooting, increases the detection angles and visual area ranges in a side view area and a top view area, has a plurality of trigger points and theoretically has no blind area.
Description
Technical Field
The utility model belongs to the technical field of optical accessories, and particularly relates to a lens structure for security protection of an outdoor camera.
Background
In the field of intelligent home security, outdoor security is also an important part, an important function of an outdoor security system is infrared induction for human body movement, a passive infrared detection technology is applied to the function, and the passive infrared detection technology needs two key elements, namely a pyroelectric infrared sensor PIR and a Fresnel lens; the pyroelectric infrared sensor (PIR) can convert infrared signal change into an electric signal and has an inhibiting effect on white light signals in nature, when no human body moves, the pyroelectric infrared sensor senses only background temperature, and when a human body enters a detection area, the pyroelectric infrared sensor senses a difference signal between the human body temperature and the background temperature through a Fresnel lens; the fresnel lens acts on two: firstly, the focusing effect, be about to the infrared signal refraction (reflection) of releasing heat on the PIR, the second effect is with dividing into a plurality of bright district and dark space in the alert district, makes the removal object that gets into the alert district can produce the infrared signal of releasing heat of change on the PIR with the form of temperature variation, and the PIR just can produce the signal of telecommunication of change like this.
The outdoor security system can use the camera inevitably, along with the application of the intelligent camera in life is more and more extensive, the functional design is more and more perfect, the design of the lens structure applied by the outdoor security camera in the prior art is adopted, the infrared induction is realized by utilizing the lens structure, but the problem that the lens structure design installed on the outdoor security camera cannot effectively break through the visual area angle and the blind area is solved, the detection angle is small, the visual area range is small, the false triggering is easy, and the application requirement of the outdoor security system on the detection function of the surrounding environment cannot be well met.
SUMMERY OF THE UTILITY MODEL
The utility model provides a lens structure for security protection of an outdoor camera, which can be used on the outdoor security camera to realize a wide-angle detection sensing range of an outdoor security system.
In order to achieve the purpose, the technical scheme of the utility model is realized as follows:
a lens structure for security protection of an outdoor camera comprises a mirror body in an arc surface shape, wherein the mirror body is projected in a semicircular shape and sequentially divided into an upper visual area, a middle visual area and a lower visual area; the upper layer visual area, the middle layer visual area and the lower layer visual area respectively comprise a plurality of lens units, the lens units are lens sheets provided with Fresnel lines, and the lens units are focused at the sensing positions of the pyroelectric sensor of the outdoor camera.
Furthermore, all the lens units of the upper visual area are arranged in parallel; the circle centers of the concentric circles of the Fresnel lines of each lens unit are positioned at the lower positions of the vertical center lines of the lens units, and all the circle centers are in a parabolic form from left to right; the bottom of each lens unit is in a parabolic form from left to right.
Furthermore, the lens units in the middle-layer visual area are arranged in parallel below the upper-layer visual area, the centers of the concentric circles of the Fresnel lines of the lens units on the left edge are positioned on the upper right side, the centers of the concentric circles of the Fresnel lines of the lens units on the right edge are positioned on the upper left side, the centers of the concentric circles of the Fresnel lines of the lens units between the lens units on the left edge and the lens units on the right edge are positioned on the upper vertical central line, and all the centers of the circles are in a parabolic form from left to right; the upper parts of the lens units in the middle-layer visual area correspond to the bottoms of the lens units in the upper-layer visual area, and the bottoms of the lens units in the middle-layer visual area are in a parabolic form from left to right.
Furthermore, the lens units of the lower-layer visual area are arranged in parallel below the middle-layer visual area, the centers of the concentric circles of the Fresnel lines of the lens units on the left edge are positioned on the left lower side, the centers of the concentric circles of the Fresnel lines of the lens units on the right edge are positioned on the right lower side, the centers of the concentric circles of the Fresnel lines of the lens units in the middle are positioned on the upper part of the vertical central line of the lens units, and all the centers of the circles are in a parabolic form from left to right; the upper part of each lens unit of the lower layer visual area corresponds to the bottom of each lens unit of the middle layer visual area.
Compared with the prior art, the utility model has the following beneficial effects:
the lens structure provided by the utility model ingeniously utilizes the Fresnel principle, and aims at the application requirement of installing infrared induction on the outdoor security camera, the wide-angle detection induction range of the outdoor security system is realized through the visual area design of the lens and the optical texture design in the visual area, the application requirement of intelligent security camera shooting is met, the detection angles and the visual area ranges in a side view area and a top view area are increased, the number of trigger points is large, and the design of theoretical blind area is avoided.
Drawings
FIG. 1 is a schematic diagram of a lens structure according to an embodiment of the utility model.
Wherein:
1. an upper viewing zone; 2. a middle layer viewing zone; 3. and a lower layer visual area.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The utility model is further described with reference to the following figures and examples.
The pyroelectric sensor is applied to an outdoor security system and is arranged on an outdoor camera structure, the pyroelectric sensor which is arranged in the outdoor security camera structure and focuses infrared signals through the lens structure provided by the utility model jointly forms infrared detection, the detection position of the lens is 2.5 meters high, the inclination angle is 20 degrees, the ambient temperature is 25 degrees, and the walking of a human body is about 1 meter/second.
The embodiment of the utility model provides a lens structure schematic diagram as shown in fig. 1, wherein a lens body is in an arc surface shape, a front projection view is in a semicircular shape, three visual areas are longitudinally arranged and respectively comprise an upper visual area 1, a middle visual area 2 and a lower visual area 3, each visual area comprises a plurality of lens units with Fresnel lines, the lens units are combined to form the whole lens body, and a detection structure with a large angle and a large visual area range is formed by matching with a pyroelectric sensor PIR in an outdoor security camera.
The projection of the lens body is in the shape of a lower semicircle, the upper part is wide, the lower part is narrow, the upper visual area 1 comprises 7 lens units, and all the lens units are arranged in parallel; the circle center of the Fresnel line concentric circle of each lens unit is positioned at the lower position of the vertical central line of the lens unit, and the circle center of the Fresnel line concentric circle of each lens unit is in an upward parabolic form from left to right; the bottom of each lens unit is in an upward parabolic form from left to right; the upper viewing zone 1 has a horizontal detection sensing angle of 120 degrees.
The middle-layer visual area 2 comprises 7 lens units, the lens units are arranged below the upper-layer visual area 1 in parallel, the upper parts of the lens units correspond to the bottom formed by the lens units of the upper-layer visual area 1, and the bottoms of the lens units of the middle-layer visual area 2 are in a parabolic form from left to right; the center of the concentric circle of the Fresnel lines of the lens units at the left edge of the middle-layer visual area 2 is positioned on the upper right side, the center of the concentric circle of the Fresnel lines of the lens units at the right edge of the middle-layer visual area 2 is positioned on the upper left side, the circle centers of the concentric circles of the Fresnel lines of the lens units between the lens units at the left edge and the right edge are positioned on the upper vertical center line of the concentric circles, and all the circle centers are in a parabolic form from left to right; the middle viewing zone 2 has a horizontal detection sensing angle of 100 degrees.
The lower visual area 3 comprises 3 lens units, the lens units are arranged in parallel below the middle visual area 2, the centers of the concentric circles of the Fresnel lines of the lens units at the left edge of the lower visual area 3 are arranged on the left lower side, the centers of the concentric circles of the Fresnel lines of the lens units at the right edge of the lower visual area 3 are arranged on the right lower side, the centers of the concentric circles of the Fresnel lines of the lens units at the middle are arranged on the upper part of the vertical central line of the lens units, and all the centers of the circles are in a parabolic form from left to right; the upper part formed by each lens unit of the lower layer visual area 3 corresponds to the bottom part formed by each lens unit of the middle layer visual area 2; the lower viewing zone 3 has a horizontal detection sensing angle of 60 degrees.
In summary, the lens structure provided by the utility model skillfully utilizes the fresnel principle, and aiming at the application requirements of intelligent security camera shooting, the detection angles and the visual area ranges of the side view area and the top view area are increased, the left detection angle and the right detection angle can reach 120 degrees at most, and a plurality of trigger points are provided, so that necessary hardware support is provided for meeting the requirements of intelligent camera shooting on the detection of the surrounding environment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. The lens structure for security protection of the outdoor camera is characterized by comprising a mirror body with an arc surface, wherein the mirror body is projected into a semicircular shape and sequentially divided into an upper visual area, a middle visual area and a lower visual area; the upper layer visual area, the middle layer visual area and the lower layer visual area respectively comprise a plurality of lens units, the lens units are lens sheets provided with Fresnel lines, and the lens units are focused at the sensing positions of the pyroelectric sensors of the outdoor camera.
2. The lens structure for the security of the outdoor camera according to claim 1, wherein the lens units in the upper visual area are arranged in parallel; the circle centers of the concentric circles of the Fresnel lines of each lens unit are positioned at the lower positions of the vertical center lines of the lens units, and all the circle centers are in a parabolic form from left to right; the bottom of each lens unit is in a parabolic form from left to right.
3. The lens structure for the security of the outdoor camera according to claim 1, wherein the lens units in the middle visual area are arranged in parallel below the upper visual area, the center of the concentric circle of the fresnel patterns of the lens units on the left edge is located on the upper right side, the center of the concentric circle of the fresnel patterns of the lens units on the right edge is located on the upper left side, the center of the concentric circle of the fresnel patterns of the lens units between the lens units on the left edge and the lens units on the right edge is located on the upper vertical center line, and all the centers of the concentric circles are in a parabolic form from left to right; the upper parts of the lens units in the middle-layer visual area correspond to the bottoms of the lens units in the upper-layer visual area, and the bottoms of the lens units in the middle-layer visual area are in a parabolic form from left to right.
4. The lens structure for the security of the outdoor camera according to claim 1, wherein the lens units in the lower visual area are arranged in parallel below the middle visual area, the center of the concentric circle of the fresnel pattern in the lens unit at the left edge is located at the left lower side, the center of the concentric circle of the fresnel pattern in the lens unit at the right edge is located at the right lower side, the center of the concentric circle of the fresnel pattern in the lens unit at the middle is located at the upper position of the vertical center line of the lens unit, and all the centers of the circles are in a parabolic form from left to right; the upper part of each lens unit of the lower layer visual area corresponds to the bottom of each lens unit of the middle layer visual area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123272714.2U CN216531507U (en) | 2021-12-23 | 2021-12-23 | Lens structure for security protection of outdoor camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123272714.2U CN216531507U (en) | 2021-12-23 | 2021-12-23 | Lens structure for security protection of outdoor camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216531507U true CN216531507U (en) | 2022-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123272714.2U Active CN216531507U (en) | 2021-12-23 | 2021-12-23 | Lens structure for security protection of outdoor camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216531507U (en) |
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2021
- 2021-12-23 CN CN202123272714.2U patent/CN216531507U/en active Active
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