Optical device, transfer mold, and image pickup apparatus
View Patent ↗An optical device includes a refracting surface refracting light, a flat surface transmitting light, and a prism group including prism elements having at least the refracting surface. Here, the prism elements are arranged with a plurality of pitches therebetween on a straight line parallel to a reference surface on which the prism elements are disposed.
1. An image pickup apparatus, comprising:
an image pickup device having a plurality of light-receiving elements arranged in a matrix;
an image picking lens guiding light to the image pickup device; and
an optical device comprising:
a refracting surface refracting light;
a flat surface transmitting light; and
a prism group including prism elements having at least the refracting surface,
the prism elements being arranged with a plurality of pitches therebetween on a straight line parallel to a reference surface on which the prism elements are disposed;
the optical device being disposed in an optical path between the image picking lens and the image pickup device.
2. The optical device of claim 1 , wherein at least one of the prism elements arranged in the straight line is disposed in a direction different from that of at least one different prism element in the straight line.
3. The optical device of claim 1 , the prism elements being arranged in a substantially concentric shape.
4. The optical device of claim 1 , the prism elements being arranged in a spiral shape.
5. The optical device of claim 1 , the prism elements having a plurality of the refracting surfaces which are inclined in directions different from each other, and
the refracting surfaces having substantially the same area.
6. The optical device of claim 1 , the prism elements being formed of a glass member.
7. The optical device of claim 1 , the prism elements being formed of a resin member.
8. The optical device of claim 1 , further comprising a substrate formed of a glass member.
9. The optical device of claim 1 , further comprising an infrared reducing member reducing a transmission of an infrared ray.
10. The image pickup apparatus of claim 1 , the optical device including a refracting surface refracting light, a flat surface transmitting light, and a prism group including prism elements having at least the refracting surface, and
the prism elements being arranged with respect to a position of the optical device corresponding to the center position of an iris.
11. The image pickup apparatus of claim 1 , the optical device including a refracting surface refracting light, a flat surface transmitting light, and a prism group including prism elements having a plurality of the refracting surfaces inclined in directions different from each other, and
the refracting surface having substantially the same area being formed in every inclining direction in a unit area determined based on an F number of the image picking lens.