laser pointer can make the audience lighted-hearted

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Convex cylindrical lens focus and the focus is called the distance between the focus of the interval D, the detection range of the disc △ dsk, the greater the detection range, sensitivity is lower, but more difficult to derail the servo, whereas the detection range of more small, the higher the sensitivity, but the servo easy to derail, D and △ dsk is the focus servo error detection system designed to determine the two values before, is the design basis for the incident light A, m the direction of the light in the S direction intersection before the light from the optical axis D, so you can find the cylindrical lens of j (power). in which the refractive lens was n1, thickness d1, n2 was thick cylindrical lens of refractive lens for the distance of two d3 e2 , j is the lens of Power, into the wavelength, the other as shown above, calculated by the following formula can be cylindrical lens radius of curvature. laser pointer can make the audience lighted-hearted.
The optical path near the PD and PD location diagram as shown below (a high for the incident, F1 is a focal length lens AF system, F2 is a cylindrical lens focal length, x is the location of PD): PD ordinary CD with four split the interval between the general is 10mm, but the DVD is generally to improve the accuracy of 5mm. Relations from the above diagram, you can easily find the required size of the PD. Returned from the surface of the disc with the information of the reflected light, the first total reflection at the PBS, and then dispose of the prism light and signal light for the servo, typically 30% and 70%. Signal with PD before the condenser lens, can be easily calculated by the following formula. Looking at laser pointer , you can immediately know the wrapping material.
In the system design is completed, the system is also necessary to discuss tolerance, including the ministries assembly of goods, processing errors and errors. Which is to discuss the various processing errors or optical head assembly error in a request for the impact indicators, whether the extent permitted. Shaping prism tolerance evaluation criteria is the level of change in the direction of the Rim intensity within ± 1%, which changes in parameters are: refractive index changes in optical glass. LD laser wavelength change (impact on the refractive index). Changes in the angle of incidence of the plastic prism. Plastic prism angle changes. Collimating lens focal length changes. LD outgoing light radiation angle changes. We can clearly visualize a bright straight laser beam of laser pointer piercing into the sky.