| 摘要 |
The present application provides a lamp cover (202, 278, 346, 358, 386, 394) for closing a window (43) of a flash unit (200, 276). The lamp cover (202, 278, 346, 358, 386, 394) comprises a first array of optical zones (254, 330, 347, 361, 388, 390, 392, 396) that are contiguously connected to each other on a surface (63) of the lamp cover (202, 278, 346, 358, 386, 394). One or more of the optical zones (202, 278, 346, 358, 386, 394) have a pitch (255, 342, 362) of 0.07 millimeter at most for visually blurring objects (34, 36, 38, 44, 48, 54, 56) placed behind the lamp cover (202, 278, 346, 358, 386, 394). The application also provides a method for making or using the flash unit (200, 276), which comprises a step of sealing the window (43) with the lamp cover (202, 278, 346, 358, 386, 394). The application further provides a method for making the lamp cover (202, 278, 346, 358, 386, 394), which comprises a step of injecting a molten optical plastic material into a mould insert (262) for providing optical zones (254, 330, 347, 361, 388, 390, 392, 396) or Fresnel zones (254, 330, 347, 361, 388, 390, 392, 396) and a step of detaching the lamp cover (202, 278, 346, 358, 386, 394) from the mould insert (262). |
