Patent ID: 8451367

Claim:
A bearing device, comprising: a support plate to support a plurality of optical modules; and a fastening element to fasten the plurality of optical modules onto the support plate; wherein each of the plurality of optical modules comprises an effective optical surface, and the fastening element comprises a first fastening piece and a second fastening piece which are fixed opposite to each other on the support plate; the first fastening piece comprises a plurality of bevels on a surface proximal to the second fastening piece, the second fastening piece comprises a plurality of receiving grooves on a surface proximal to the first fastening piece and opposite to the corresponding bevels; when the first and second fastening pieces cooperatively mount each optical module on the support plate, an end of each optical module opposite to the effective optical surface is received in each of the receiving groove, the effective optical surface of each optical module attaches to each bevel opposite to the corresponding receiving groove, such that the plurality of effective optical surfaces are coplanar.