The cat's eye, also known as the door mirror, is a small optical instrument mounted on the door of a residential house, which is convenient for residents to observe the outdoor situation. Has become a necessity for home security. It consists of a concave lens (objective lens) and a convex lens. The focal length of the objective lens is extremely short, which makes the outdoor person or object a virtual image that is upright and narrow. This image falls within the focus of the eyepiece, and finally an enlarged erect virtual image is obtained. This image is just in the human eye. Nearby, the situation outside the door can be seen clearly.
The electronic cat's eye, also known as the visual doorbell, integrates the functions of the cat's eye and the doorbell, and overcomes the shortcomings and safety hazards of the traditional optical cat's eye, and increases the role of monitoring. It is widely used in the doorway of homes and high-end hotels. An upgraded and replacement product for the optical cat's eye.
Comparison of electronic cat's eye traditional cat's eye
Traditional cat eyes:
Traditional cat eyes are optical imaging and have a lot of inconvenience in practical use. For example, the viewing angle is not large enough and the viewing range is limited. Must be close to the door to see. In the evening, there is no light in the corridor, and the old man’s eyesight is not good. The child’s height is not enough for them to use.
In addition to the inconvenience, it is more important to bury hidden dangers for the safety of the family. A cat-eye voyeur has appeared in the society. Through it, criminals can see the situation inside the house from outside the door. In addition to the protection of privacy, it will also facilitate the crimes committed by criminals. I only pay attention to it. We often see relevant reports from the media: criminals found no one in the house, removed the cat's eye, and used tools to reach into the door to open the lock for theft.
Electronic cat's eye:
The electronic cat eye has overcome all the above drawbacks and integrated the doorbell function, and also enhanced the monitoring and safety performance of the cat's eye.
Specific contrast between electronic cat eyes and traditional cat eyes
Insufficient traditional cat eyes
1 The image is uneven, and the viewing angle is small, and the range of viewing is limited;
2 need to be close to the door to see, the old man's eyesight is not easy to see clearly, the child's height is not enough to watch;
3 If there is insufficient light or there is no light at night, you cannot see the situation outside the door;
4 No doorbell function, you need to install another doorbell;
5 optical imaging, using the "anti-cat eye" to see the room from the outside of the door;
6 is mostly easy to be smashed;
Differences in electronic cat eyes
In fact, the electronic cat's eye is an upgraded product of the traditional cat's eye. Specifically, they have two different aspects:
(1) First of all, it overcomes the inconvenience of the use of traditional cat eyes;
1 large wide-angle and high-pixel camera, the image is not deformed, and the range of viewing is quite large;
2 large screen LCD display, can be seen from a long distance;
3 There are night vision lights, and the environment without lights is used as usual;
4 integrated doorbell function, the doorbell and cat's eye are integrated, the bell rings and the screen displays;
(2) Secondly, it basically prevents the possibility of peeping from outside the door and strengthens the role in security.
1 has a memory function, when someone rings the doorbell, not only can hear the ringtone, but also see the guest from the screen, it can also take pictures, this is very good, can remember the voice image information of the coming person, or it is very convenient Leave a message to the owner and play it back when we need it.
2 In addition, there is more automatic memory, that is, the function of detection. Within a certain range, after sensing the human body, it will automatically take pictures and video recording, which is a very practical safety monitoring function;
3 alloy external machine, installed from the outside, to achieve the anti-mite effect
The reason why the electronic cat's eye replaces the traditional cat's eye
The benefits and advantages of the electronic cat's eye compared to the traditional cat's eye are well known to everyone. This is one of them. The second is that the electronic cat's eye itself is in the field of electronic technology applications, and other smarter and richer technologies will be used, such as wireless intercom, etc., and will become more and more part of the overall home security system. Therefore, it is inevitable to replace the traditional cat eyes.
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