Abstract: A valve core of an ink cartridge includes an elastic valve sheet having an inner portion and an outer portion. The outer portion extends outwards from the inner portion and protrudes towards an upstream side of the valve core. The outer portion is adapted to sealingly engage and disengage with a valve seat in which the valve core is mounted.

Abstract: A battery pack for a camera includes a main housing for containing one or more batteries. An adaptor electrically connected to the one or more batteries protrudes from the main housing and is configured for electrical engagement with a camera supported on the main housing. The battery pack optionally includes one or more of the following: a display screen on the main housing for displaying system functions or images and videos captured by the camera; a wireless transmission device in the main housing for transmitting images captured by the camera to a remote receiver; one or more memory unit housings in the main housing for receiving one or more memory units.

Abstract: A battery pack for a camera includes a main housing for containing one or more batteries. An adaptor electrically connected to the one or more batteries protrudes from the main housing and is configured for electrical engagement with a camera supported on the main housing. The battery pack optionally includes one or more of the following: a display screen on the main housing for displaying system functions or images and videos captured by the camera; a wireless transmission device in the main housing for transmitting images captured by the camera to a remote receiver; one or more memory unit housings in the main housing for receiving one or more memory units.

Abstract: A protective device to protect a camera view finder and one kind of LCD protective device, which consists of a frame and a light screen installed on a frame. The frame is a separate structure. A transparent plate is installed in the middle part of the frame and a rotatable light screen is set on the frame, which can be folded through rotation. A rotatable cover plate on the other side of the frame can cover the folded light screen. An adhesive substance on the surface connects the frame to the camera body. This structure improves the view finder from strong light scattering while the camera is in use, and at the same time, provides protection for the view finder.

Abstract: A battery pack for a camera includes a main housing for containing one or more batteries. An adaptor electrically connected to the one or more batteries protrudes from the main housing and is configured for electrical engagement with a camera supported on the main housing. The battery pack optionally includes one or more of the following: a display screen on the main housing for displaying system functions or images and videos captured by the camera; a wireless transmission device in the main housing for transmitting images captured by the camera to a remote receiver; one or more memory unit housings in the main housing for receiving one or more memory units.

Abstract: A valve core of an ink cartridge includes an elastic valve sheet having an inner portion and an outer portion. The outer portion extends outwards from the inner portion and protrudes towards an upstream side of the valve core. The outer portion is adapted to sealingly engage and disengage with a valve seat in which the valve core is mounted.

Abstract: This utility model belongs to the assistant devices field of camera, especially is acceptable for one kind of protective device to protect the camera view finder and one kind of LCD protective device, which consists of frame and light screen installed on the frame. The said frame adopts separate structure. There is a transparent plate installed in the middle part of frame and also a rotatable light screen set on the frame, which can be folded through the rotation. There is a rotatable cover plate on the other side of frame, which can cover the folded light screen. There is adhesive substance on the surface connecting the frame and camera body. This structure can apparently improve the influence against view finder due to strong light scattering while the camera is in use, and at the same time, it can provide protection for the view finder.