Nittoh Kogaku K.k.

Nittoh Inc.

Takashi Yamaguchi

Takuya Kageyama

Atsuro Yajima

In a reflection mirror having a concave curved reflection surface, when a surface of the reflection mirror on the side where the reflection surface is formed is a front surface, a surface thereof opposite to the front surface is a rear surface, a direction parallel to an optical axis of the reflection mirror is a first direction, and a direction from the front surface toward the rear surface which is oriented to one side in the first direction is a second direction, the rear surface of the reflection mirror has a flat surface orthogonal to the first direction and a wall surface that rises from at least a part of a region around the flat surface toward the second direction.

Reflecting mirror and mirror holding mechanism

A mirror holding mechanism includes: a reflection mirror, a mirror holding member, and a cam member. The mirror holding member has two side surface portions sandwiching the reflection mirror in an X direction. In the side surface portion, a guide hole through which a shaft portion protruding from the reflection mirror to an outer side in the X direction is formed so as to pass through the side surface portion. The guide hole is formed into a long hole longitudinally extending in a Y direction. The cam member is disposed on an outer side of the side surface portion in the X direction and rotatably held by the side surface portion. On the cam member, a cam surface with which a distal end part of the shaft portion comes into contact is formed. When the cam member rotates, the shaft portion moves in the Y direction.

Mirror holding mechanism

A lens holder holds a plurality of lenses aligned in a direction of an optical axis. This lens holder is at least partially assembled from subunits divided on a plane that includes the optical axis. In a connecting shell that connects a first shell and a second shell and holds an optical element for bending an optical path, an optical path of only one subunit is effectively used. The connecting shell includes a first connecting structure for connecting to the first shell and second connecting structures for connecting to the second shell, the second connecting structures being disposed at two symmetrical positions around the first optical axis.

Lens holder and lens unit

A lens holder for holding a plurality of lenses is provided. The lens holder is assembled from a plurality of subunits divided on a plane that is parallel to an optical axis. A subunit includes a substantially cylindrical outer shell and front side rear side portions that extend from an inner surface of the outer shell toward the optical axis to support at least one lens from in front and behind respectively. When the at least one lens is attached between the portions, one of the portions is harder to deform than the other of portions.

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Suwa, Japan

Takashi Yamaguchi