Reticle unit, optical instrument, and rifle scope

A reticle unit comprising:

• a reflector provided with a concave portion on one of surfaces of a plate-like optical member, wherein at least part of a side surface of the concave portion is a reflection surface;
• a light source that is arranged laterally to the reflector and that emits light;
• and
• a light collector that is arranged between the light source and the reflector and that collects the light from the light source onto a surface substantially parallel to the surface on which at least the concave portion is formed to form an image of the light source on or near the reflection surface, wherein
• at least part of the light incident on the reflection surface is totally reflected by the reflection surface and the totally reflected light is exited from the reflector;
• the reticle unit further comprising a reticle member provided with a reticle on one of the surfaces of the plate-like optical member,
• wherein the reflector is arranged so that one of the surfaces of the reflector faces the surface provided with the reticle.

A reticle unit comprising:

• a reflector provided with a concave portion on one of surfaces of a plate-like optical member, wherein at least part of a side surface of the concave portion is a reflection surface;
• a light source that is arranged laterally to the reflector and that emits light;
• and
• a light collector that is arranged between the light source and the reflector and that collects the light from the light source onto a surface substantially parallel to the surface on which at least the concave portion is formed to form an image of the light source on or near the reflection surface, wherein
• at least part of the light incident on the reflection surface is totally reflected by the reflection surface and the totally reflected light is exited from the reflector, and wherein
• when an optical axis of the light source and the light collector is defined as a first optical axis, and an optical axis for reflecting the light by the reflection surface to exit the light from the reflector is defined as a second optical axis, the first optical axis and the second optical axis are substantially orthogonal.

A reticle unit comprising:

• a reflector provided with a concave portion on one of surfaces of a plate-like optical member, wherein at least part of a side surface of the concave portion is a reflection surface;
• a light source that is arranged laterally to the reflector and that emits light;
• and
• a light collector that is arranged between the light source and the reflector and that collects the light from the light source onto a surface substantially parallel to the surface on which at least the concave portion is formed to form an image of the light source on or near the reflect ion surface, wherein
• at least part of the light incident on the reflection surface is totally reflected by the reflection surface and the totally reflected light is exited from the reflector, wherein
• an optical axis of the light source and the light collector is defined as a first optical axis, and an optical axis for reflecting the light by the reflection surface to exit the light from the reflector is define as a second optical axis, and wherein
• the reflection surface is a cylindrical surface in which only a meridional plane, which includes the first optical axis and the second optical axis, has a curvature, and an intersection of the meridional plane and a sagittal plane, which includes the optical axis of the reflection surface and which is perpendicular to the meridional plane, is tilted substantially 45° relative to the second optical axis.

A reticle unit comprising:

• a reflector provided with a concave portion on one of surfaces of a plate-like optical member, wherein at least part of a side surface of the con cave portion is a reflection surface;
• a light source that is arranged laterally to the reflector and that emits light;
• and
• a light collector that is arranged between the light source and the reflector and that collects the light from the light source onto a surface substantially parallel to the surface on which at least the concave portion is formed to form an image of the light source on or near the reflection surface, wherein
• at least part of the light incident on the reflection surface is totally reflected by the reflection surface and the totally reflected light is exited from the reflector, and wherein
• a diameter when the reflection surface is projected to the side surface provided with the concave portion forming the reflection surface is within a range of 10 μm to 200 μm.