Abstract: A camera device with multiple lens units and having a function of changing focus automatically comprises: a camera unit with multiple lens units, an image display screen and an image control circuit. The camera unit includes a lens assembly with a plurality of lens units, a base tightly adhered to a back of the lens frame, an image sensor is installed on the base at a position with respect to the lens cavity; and at least one passive sensor being set with different sensing length which is exactly matched with the focus or visual angle of each lens set. The image control circuit is installed between the camera unit and the image display screen and has a detecting signal judging portion, a priority image operation portion, and an image display execution portion. The image display execution portion receives the signals from the detecting signal judging portion or priority image operation portion, and then receives images of a specific lens, and then actuates a screen and displaying the image on the screen.

Abstract: A door security device mounted on a door having a hole comprises a lens mounted on a fitting, a telescopic tube inserted into the hole secured to the fitting on front of door, a complementary metal oxide semiconductor (CMOS) based image sensor in the rear end of hole for sensing image through lens for converting into image signals, an image processor for processing image signals sent from image sensor, and a liquid crystal display (LCD) for showing the image. With this, advantages such as high safety, low power consumption, adaptability, easy assembly, compact, flexibility, and no damage to door by using existing door hole can be effected.

Abstract: A electromagnetic wave preventing cover of an mobile phone handset is covered to a casing of a handset and is connected to the antenna seat hole of the handset, so that the transmitting antenna of the mobile phone handset for emitting electromagnetic radiation is far away from the brain, and thus, the harm of the electromagnetic wave to the brain is reduced. A cover has a space for enclosing the mobile phone handset, and has a slot at the front surface of the cover for extending the communicating covering plate of the handset, and the cover has an opening for receiving the handset into the cover. A terminal serves to insert into the antenna seat hole of the mobile phone handset. An antenna is adhered to the outer surface of the communicating covering plate of the handset. A micro-wave shield coaxial cable is fixed within the cover and has an end connected to the terminal and another end connected to the planar antenna.

Abstract: An artificial knee joint includes a hollow cylinder (5) in which a piston member (62) is disposed movably. The piston divides the cylinder (5) into upper and lower chambers (51, 52). The swing phase control member (8) has first and second channels (80, 81), a fulcrumed lever member (82) bridging the first and second channels (80, 81). The second channel (81) is communicated with the upper and lower chambers (51, 52). The first end of the lever member (82) extends into the first channel (80) for movement in response to an air pressure in the first channel (80). The second end of the lever member (82) has a first throttle valve unit (83) for regulating the air flow through the second channel (81) in response to a movement of the lever member (82). A pump unit (7) is associated operatively with the piston member (62) for pumping air from the ambient to the first channel (80) in response to a movement of the piston member (62).