Abstract: Provided is a microswitch wherein the versatility of a lever member can be prevented from being reduced while the rigidity of the lever member is improved. The microswitch is provided with a housing containing a switch mechanism, a plunger which transmits power to the switch mechanism, and a lever member, the base end of which is supported by the housing. In the microswitch, the tip end of the plunger abuts with the bottom surface of the lever member at an intermediate position in the longitudinal direction of the lever member, and an object to be detected can abut with the top surface of the lever member on the tip end side of the lever member. Further, a first reinforcement portion is formed on the top surface of the lever member, excluding an object abutment portion with which the object to be detected is to be abutted, and a second reinforcement portion is formed on the bottom surface of the lever member, excluding a plunger abutment portion.

Abstract: Provided is a microswitch wherein the versatility of a lever member can be prevented from being reduced while the rigidity of the lever member is improved. The microswitch is provided with a housing containing a switch mechanism, a plunger which transmits power to the switch mechanism, and a lever member, the base end of which is supported by the housing. In the microswitch, the tip end of the plunger abuts with the bottom surface of the lever member at an intermediate position in the longitudinal direction of the lever member, and an object to be detected can abut with the top surface of the lever member on the tip end side of the lever member.

Abstract: An optical head device may include a laser light source, an objective lens for converging a laser beam emitted from the laser light source on an optical recording medium, a parallel planar half mirror which is disposed on an optical path directing from the laser light source to the optical recording medium and which partially transmits the laser beam emitted from the laser light source diagonally as a divergent beam, and an aberration correcting element for correcting aberration which is occurred when the laser beam before converged on the optical recording medium is transmitted through the half mirror. Since the aberration correcting element is disposed on an optical path directing from the laser light source to the optical recording medium, a satisfactory spot can be formed on an optical recording medium.