Patent Application
20160025570
1. Field of the Invention
The present invention relates to a sensing device with a glare shield, and more particularly to an infrared sensing device using a glare shield against glare from neighboring light sources.
2. Description of the Related Art
Sensing devices can be classified info many different types, such as temperature-sensing device, humidity-sensing device, infrared-sensing device and the like, based on sensing techniques of the sensing devices. The infrared-sensing devices can be bundled with lighting devices in operation and mounted at venues like hallway, stairway, garage and so on. For example, an infrared sensing device detects infrared rays emitted from an intruder and drives a bundled lighting device to turn on upon detection of the intruder's entry into a detection range thereof, and drives the lighting device to turn off when the intruder is out of the detection range, thereby providing powers-saving and anti-theft functions.
However, when in use, conventional infrared sensing devices are susceptible to glare from lighting devices in the nearby or in a range of lighting and thus easily misjudge environmental luminance to incorrectly turn on or turn off lighting devices corresponding to the conventional infrared sensing devices.
An objective of the present invention is to provide a sensing device with a glare shield prevent an infrared sensor of the sensing device from being affected by glare emitted from adjacent light sources and resulting in incorrect determination of ambient luminance and misoperation when the infrared sensor is bundled with a lighting device in operation.
To achieve the foregoing objective, the sensing device with a glare shield has an infrared sensor and a glare shield.
The infrared sensor has a body and a lens hood.
The body has a light-receiving side.
The lens hood is mounted on the light-receiving side of the body.
The glare shield is detachably mounted around the lens hood of the infrared sensor, extends in a direction away from the body, and has a conical portion and a bottom opening.
The conical portion has two open ends differing from each other in diameter, and progressively increasing in outer diameter and extending outwards from one of the open ends with a smaller outer diameter to the other open end with a larger outer diameter.
The bottom opening is defined at the open end of the conical portion with the larger outer diameter.
The present invention is advantageous in inclusion of the glare shield, which prevents glare emitted from adjacent lighting devices from entering the infrared sensor and causing incorrect judgment of ambient luminance and misoperation thereof when the infrared sensor is bundle with a lighting device in operation.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
The infrared sensor has a body 10 and a lens hood 20. The body 10 has a light-receiving side, a mounting portion 110, an outer threaded portion 111, a positioning disc 112, an annular protrusion 113, and an infrared sensing element 114.
In the present embodiment, the mounting portion 110 is cylindrical. The outer threaded portion 111 is formed on an outer periphery of the mounting portion 110. The positioning disc 113 is formed on a bottom surface of the mounting portion 110 with an edge of the positioning disc 113 protruding beyond the outer periphery of the mounting portion 110. The annular protrusion 113 is formed on a bottom of the positioning disc 112, and has multiple L-shaped recesses 1130 formed in an outer wall of the annular protrusion 113 and spaced apart by gaps. The infrared sensing element 114 is mounted on the bottom of the positioning disc 112 and is surrounded by the annular protrusion 113.
The lens hood 20 is conical, is mounted on the light-receiving side of the body 10, and has a closed end, an open end, a conical surface 21, a ring wall 22 and multiple bosses 221. The lens hood 20 progressively increases in outer diameter from the closed end to the open end. The closed end is transparent. The conical surface 21 is formed around the closed end of the lens hood 20. The ring wall 22 is formed around the open end of the lens hood 20. The bosses 221 are formed on an inner periphery of the ring wall 22, spaced apart by gaps, and corresponding to the L-shaped recesses 1130 such that the bosses 221 rotatably engages in the respective L-shaped recesses 1130 and the lens hood 20 can be fastened on a bottom of the body 10 to cover the infrared sensing element 114. Accordingly, external sensing signals can be focused on the infrared sensing element 114 through the lens hood 20 to expand a sensible range of the infrared sensing element 114 by increasing intensity of the sensing signals.
The glare shield 30 is detachably mounted on an outer wall of the lens hood 20, extends in a direction away from the body 10, and has a conical portion 31, an annular flange 32, at least one barb 33 and a bottom opening 34. The conical portion 31 has two open ends. The two open ends of the conical portion 31 differ from each other in outer diameter. The conical portion 31 extends outwards from one of the open ends with a smaller outer diameter to the other open end with a larger outer diameter. An included angle between an inner side of the conical portion 31 and the lens hood 20 is in a range of 145°±30°. The annular flange 32 is formed on and protrudes inwards from the open end of the conical portion 31 with a smaller diameter, and is detachably mounted on the lens hood 20. The at least one barb 33 is formed on a top edge of an inner wall of the annular flange 32, is spaced apart by gaps, and detachably engages an outer wall of the ring wall 22 of the lens hood 20 for the convenience of assembly and disassembly. The bottom opening 34 is defined at the open end of the conical portion 31 with a larger diameter.
With reference to
From the foregoing, the sensing device in accordance with the present invention can prevent glare emitted from adjacent lighting device from entering and influencing the sensing device. Accordingly, when the sensing device is bundled with a lighting device in operation, the sensing device can perform normal judgment of environmental luminance without causing misoperation arising from glare generated in the neighborhood.
With reference to
The glare shield 70 has a conical portion 71 and a bottom opening 72. The conical portion 71 has two open ends. The two open ends of the conical portion 71 differ from each other in diameter. The lens hood 60 is integrally formed on an inner wall of the open end of the conical portion 72 with a smaller diameter. An included angle between an inner side of the conical portion 71 and the lens hood 60 is in a range of 145°±30°. The bottom opening 72 is defined at the open end of the conical portion 71 with a larger diameter.
The body 50 has a mounting portion 51 and an outer threaded portion 52. The outer threaded portion 52 is formed on a periphery of the mounting portion 51. The mounting ring 80 is selectively mounted around the outer threaded portion 52 to engage the mounting portion 51 of the body 50.
With reference to
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only. Changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
