A driving apparatus which is capable of smoothly moving a follower by a cam portion, and realizes the stopper structure of the follower by a small number of components without the size increased. The driving apparatus comprises an up cam gear having an up radial cam and an up thrust cam, and a down cam gear unit having a down radial cam and a down thrust cam. The up cam gear and the down cam gear unit mesh with each other in a vicinity of a region in which a lift amount of the up radial cam with respect to the follower increases. In a vicinity of a position at which the up cam gear and the down cam gear unit mesh with each other, a lift amount of the up thrust cam is larger than a lift amount of the down thrust cam in the thrust direction.

A driving apparatus which is capable of smoothly moving a follower by a cam portion, and realizes the stopper structure of the follower by a small number of components without the size increased. The driving apparatus comprises an up cam gear having an up radial cam and an up thrust cam, and a down cam gear unit having a down radial cam and a down thrust cam. The up cam gear and the down cam gear unit mesh with each other in a vicinity of a region in which a lift amount of the up radial cam with respect to the follower increases. In a vicinity of a position at which the up cam gear and the down cam gear unit mesh with each other, a lift amount of the up thrust cam is larger than a lift amount of the down thrust cam in the thrust direction.

An eyepiece optical system includes a focal-plane plate, having a positive refractive power on one side and a diffusion surface on the other side thereof; a reflector which reflects light rays of an object image, formed on the diffusion surface, a predetermined number of times; an optical lens group, by which the object image is observed, in that order along an optical path from the object side to the viewing side; and a condenser lens element, having a positive refractive power, provided between the focal-plane plate and the reflector, the condenser lens element having an aspherical surface formed on at least one side thereof. At least one of the aspherical surface of the condenser lens element has a profile, when viewed macroscopically, such that the positive refractive power thereof increasingly weakens with respect to a direction away from the optical axis.

An eyepiece optical system includes a focal-plane plate, having a positive refractive power on one side and a diffusion surface on the other side thereof; a reflector which reflects light rays of an object image, formed on the diffusion surface, a predetermined number of times; an optical lens group, by which the object image is observed, in that order along an optical path from the object side to the viewing side; and a condenser lens element, having a positive refractive power, provided between the focal-plane plate and the reflector, the condenser lens element having an aspherical surface formed on at least one side thereof. At least one of the aspherical surface of the condenser lens element has a profile, when viewed macroscopically, such that the positive refractive power thereof increasingly weakens with respect to a direction away from the optical axis.

A laser-based speed gun includes a camera module and a folded optical system including an objective lens and an eyepiece lens. The folded optical system includes first and second image redirecting elements for redirecting an image pathway from the objective lens to the eyepiece lens adjacent the camera module.

A laser-based speed gun includes a camera module and a folded optical system including an objective lens and an eyepiece lens. The folded optical system includes first and second image redirecting elements for redirecting an image pathway from the objective lens to the eyepiece lens adjacent the camera module.

A sighting device, including an optical element having a concave reflection surface and an aiming light source and forming in a visual field frame, comprises a main-body housing section that houses the optical element and the aiming light source and has an opening on an upper surface side, a cover member that covers the upper surface side of the main-body housing section, and a link mechanism that couples the main-body housing section and the cover member and moves the cover member with respect to the main-body housing section. The cover member is moved by the link mechanism between a closed position where the cover member covers the opening of the main-body housing section and an open position where the cover member is disposed in a position separated from the opening of the main-body housing section and forms an optical path of the aiming light.

A sighting device, including an optical element having a concave reflection surface and an aiming light source and forming in a visual field frame, comprises a main-body housing section that houses the optical element and the aiming light source and has an opening on an upper surface side, a cover member that covers the upper surface side of the main-body housing section, and a link mechanism that couples the main-body housing section and the cover member and moves the cover member with respect to the main-body housing section. The cover member is moved by the link mechanism between a closed position where the cover member covers the opening of the main-body housing section and an open position where the cover member is disposed in a position separated from the opening of the main-body housing section and forms an optical path of the aiming light.

An apparatus is disclosed. The apparatus may include a housing detachably couplable to a sighting device. The housing has a first opening and a second opening defining a viewing axis, and a sight shade disposed adjacent the first opening. The second opening is configured to engage an end of the sighting device. The viewing axis of the housing is coaxial with a viewing axis of the sighting device. The housing also includes at least one elongated member coupled with the housing and extending away from the second opening in a direction that is parallel with the viewing axis. The housing also includes a coupling device that is slidably coupled with the at least one elongated member, and configured to couple the at least one elongated member to the sighting device.

An apparatus is disclosed. The apparatus may include a housing detachably couplable to a sighting device. The housing has a first opening and a second opening defining a viewing axis, and a sight shade disposed adjacent the first opening. The second opening is configured to engage an end of the sighting device. The viewing axis of the housing is coaxial with a viewing axis of the sighting device. The housing also includes at least one elongated member coupled with the housing and extending away from the second opening in a direction that is parallel with the viewing axis. The housing also includes a coupling device that is slidably coupled with the at least one elongated member, and configured to couple the at least one elongated member to the sighting device.