Patent ID: 7329053
Filing Date: 2008-02-12
Classification: G02B,G11B

Abstract:
1. An optical transmission device, comprising: a case that holds an optical element that receives and/or transmits light, provided with a plug insertion hole into which an optical signal transmission plug is inserted; and a shutter mechanism having a shutter that opens and closes the plug insertion hole; wherein the case is provided with an installation part that holds the shutter such that it can rotate freely, and the shutter mechanism can be installed from an outside to the installation part, wherein the shutter mechanism is provided with a torsion coil spring, the torsion coil spring being held by the shutter and biasing the shutter in a direction that closes the shutter, wherein the shutter is provided with a rotating shaft and a holding means for holding the torsion coil spring, the holding means being configured of a support portion for holding the torsion coil spring and a protrusion for preventing detachment of the torsion coil spring, and wherein the installation part is provided with a bearing into which the rotating shaft is fitted.