초록 ▼

An apparatus for adjusting light beam direction comprises, for instance, two prisms, i.e., a first and a second prisms arranged, in order, along an incident direction of light beam; an incident face of the first prism being parallel to a plane which is assumed to rotate an imaginary vertical plane p

An apparatus for adjusting light beam direction comprises, for instance, two prisms, i.e., a first and a second prisms arranged, in order, along an incident direction of light beam; an incident face of the first prism being parallel to a plane which is assumed to rotate an imaginary vertical plane perpendicular to the incident direction around a rotational axis by a first acute angle; an outgoing face of the first prism being parallel to a plane which is assumed to rotate the vertical plane around the axis by a second acute angle larger than the first one in the same direction as the latter; an incident face of the second prism being parallel to the outgoing face of the first prism and an outgoing face of the second prism being parallel to the incident face of the first prism, at the zero-adjusting state; and at least one of these prisms being able to adjustably rotate around the rotational axis. The apparatus may be incorporated into a scanning optical apparatus and makes it possible to make the incident and outgoing light beams parallel to one another and to restrict, to a low level or even to zero, the shift therebetween.

대표청구항 ▼

An apparatus for adjusting light beam direction comprising a first prism and a second prism arranged, in order, along an incident direction of light beam, characterized in that an incident face of the first prism is defined by rotating a vertical plane which is perpendicular to the incident directio

An apparatus for adjusting light beam direction comprising a first prism and a second prism arranged, in order, along an incident direction of light beam, characterized in that an incident face of the first prism is defined by rotating a vertical plane which is perpendicular to the incident direction, around a rotational axis parallel to the vertical plane defined by rotating by a first acute angle; an outgoing face of the first prism defined by rotating the vertical plane in the same direction as the first acute angle around the rotational axis by a second acute angle which is larger than the first acute angle; an incident face of the second prism is parallel to the outgoing face of the first prism at zero-adjusting state; an outgoing face of the second prism is parallel to the incident face of the first prism at the zero-adjusting state; and at least one of these two prisms is designed so as to adjustably rotate around the rotational axis.