Lenses can be widely used in fields such as safety, automotive, digital cameras, lasers, optical instruments, etc. With the continuous development of the market,led lens technology has been increasingly widely applied.
Lens pattern:
1. Lenses are represented by lens symbols (a line segment has two V-shaped markings at both ends)
Draw the main optical axis and mark the optical center. The focal point can obtain the image features of the lens (such as virtual, real, size, forward and backward) based on the intersection point of two refracted lights (usually the optical center light and parallel to the main optical axis) among the three special lights of the LED lens.
2. When imaging with a lens, all the light rays emitted from each point on the object that illuminate the lens are imaged at the same position, blocking some of the light rays and not affecting others that illuminate the LED lighting lens, resulting in a complete image. However, due to the decrease in light on the shooting image, the brightness of the screen image will darken.
The three changes of the lens:
① Changes in image size and distance: When an object approaches the focal point, the image becomes larger and the image distance becomes larger.
② Changes in image movement speed: When the object is located outside the focal length point of 2 times (u>2f) and the distance between the objects is greater than the image distance, an inverted and reduced image is formed, and the object's movement speed is greater than the image's movement speed; The distance variation of an object between 2 times the focal length and the focal length (f times the focal length).
③ The change in distance between object positions: When an object is at twice the focal length, the imaging is at twice the focal length on the other side, and the distance between object positions is smaller, equal to four times the focal length. When an object is outside the double focal length, the imaging is between the other side's focal length and the double focal length, and the object moves towards the double focal length, resulting in a smaller distance between the objects; When an object is at double focal length (between focal length and double focal length), the imaging is outside the other side at double focal length, and the object moves towards double focal length, resulting in a smaller distance between the objects; When an object moves towards the focus, the distance between objects increases.
