Anti-dazzling screen and focusing lens location judging system

Abstract

The invention relates to a shade chip and a judging system for a focusing lens position. The system comprises the shade chip, a light interrupter and a processing module. The shade chip comprises a first area and a second area. The length of each sub-area which is shaded in the first area is first length and the length of each un-shaded sub-area gradually increases from the center of the shade chip to a first borderline of the shade chip. The length of each un-shaded sub-area in the second area is a second length and the length of each shaded sub-area in the second area gradually increases forthe center of the shade chip to the borderline of the shade chip. The light interrupter moves within the focusing scope and the shade chip produces a high signal and a low signal. The processing module judges the focusing lens position according to the high signal and the low signal.

Description

technical field [0001] The invention relates to a focusing system and method, in particular to a light-shielding sheet and a system capable of determining the position of a focusing lens. Background technique [0002] With the evolution of the times, the development of the camera has evolved from a traditional film camera to a digital camera in which the film is replaced by an image sensing unit, such as a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). Since the digital photos taken by the digital camera can be easily viewed and processed in related devices, such as a computer system, the digital camera has become one of the necessary items in modern life. [0003] Digital cameras usually provide an auto-focus function. figure 1 Shows the relationship between the shutter and the photointerrupter for a known autofocus. In the known autofocus process, since the position of the focusing lens cannot be directly judged, the photointerrupter 1 m...

AI Technical Summary

Problems solved by technology

[0004] As mentioned above, the known autofocus method is to set the length of each covered sub-region on the light-shielding sheet 2 to be consistent, and the length of each non-covered sub-region is also consistent. or reset, the photointerrupter 1 must first return to the mechanical origin (11 or 12) to ensure the initial position of the photointerrupter

[0005] In addition, during the auto-focus search process, when the driving device driving the photo-interrupter 1 is out of adjustment, it will cause auto-focus failure

Photointerrupter 1 may even run out of the range of light shield 2, because light shield 2 cannot be detected and cause a crash

In addition, in the known autofocus method, if the electronic system inside the digital camera crashes or the driving device has a short-term card failure, the photointerrupter 1 must return to the mechanical origin (11 or 12) again, so that Secure the home position of photointerrupter 1 again

In this way, the digital camera will waste too much time repeating the action of returning to the mechanical origin (11 or 12) at the photointerrupter 1

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