Abstract: A bokeh filter membrane, which is disposed on a surface of a substrate, includes a gradient thickness absorbing membrane and an anti-reflection membrane. The anti-reflection membrane includes a high-and-low refraction membrane and a gradient refraction membrane. A transmittance of the substrate at a center thereof is greater than a transmittance of the substrate at a peripheral region thereof. The high-and-low refraction membrane includes a first high-and-low refraction membrane and a second high-and-low refraction membrane, the gradient thickness absorbing membrane is farther away from the substrate than the first high-and-low refraction membrane, the second high-and-low refraction membrane is farther away from the substrate than the gradient thickness absorbing membrane, and the gradient refraction membrane is farther away from the substrate than the second high-and-low refraction membrane. The gradient refraction membrane includes a plurality of pores.

Abstract: A catadioptric optical membrane, which is disposed on a surface of a substrate, includes a reflection membrane and a matting membrane. The reflection membrane is disposed on an effective optical path area of the substrate and includes a reflection metal membrane and a reflection oxidation membrane. The reflection oxidation membrane includes a first reflection oxidation membrane and a second reflection oxidation membrane. The reflection metal membrane is farther away from the substrate than the first reflection oxidation membrane. The second reflection oxidation membrane is farther away from the substrate than the reflection metal membrane. The matting membrane is disposed on a non-effective optical path area of the substrate. The matting membrane includes a deep-color membrane and a first anti-reflection membrane. The deep-color membrane includes a deep-color metal membrane and a deep-color oxidation membrane. The deep-color membrane is farther away from the substrate than the first anti-reflection membrane.

Abstract: A fixing device includes a fixing member and two fixing belts. The fixing member includes a plate, two fixing portions extending from opposite sides of the plate, and a locking portion located between the two fixing portions. The locking portion includes a locking belt extending from the plate and a connecting portion extending from the plate. The locking belt is locked to the connecting portion to form a locking loop. The two fixing belts are fixed to the two fixing portions.

Abstract: A fixing device includes a fixing member and two fixing belts. The fixing member includes a plate, two fixing portions extending from opposite sides of the plate, and a locking portion located between the two fixing portions. The locking portion includes a locking belt extending from the plate and a connecting portion extending from the plate. The locking belt is locked to the connecting portion to form a locking loop. The two fixing belts are fixed to the two fixing portions.