BenQ 2720S Service Guide - Page 20
Diagram of Light Path, 1.1 Light Source, 1.2 Imaging
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The optics process can be divided into three steps in detail: light source, imaging and receiving. The light path diagram is shown in Figure 4-2. And the three steps will be described in the following: Figure 4-2 Diagram of Light Path 4.1.1 Light Source Using a lamp to be the light source here. Reflect plate is a tool that used to increase light intensity. Applying light to go through the object and the non-reflected light will pass through window cover, lens, and finally forms an image on color CCD. If the intensity of light is too low, the color CCD can't work precisely. Please replace a new lamp under this situation. 4.1.2 Imaging It gets an image by lens in this step, and the diagram is shown in Figure 4-3. The light of the object passing through this lens to form an image on the CCD, and the magnification (M) equals image distance (q) divided by object distance (p), i.e., M= q / p. From Fig.4-4, we can get the paraxial formula about lens focus (f), object distance (p) and image distance (q). The formula describes relation between lens focus (f), object distance (p), and image distance (q) as 1/f = 1/p +1/q. 4-6 API Confidential Mechanism No Copy/Reproduction allowed