Fresnel , lens, screen, image display device, lens mold manufacturing method and lens manufacturing method
First Claim
Patent Images
1. A Fresnel lens, comprising:
- a pitch area having a hybrid type prism portion which has both a refraction type prism portion for making a ray of first incident light having a prescribed incident angle go out according to a first a refraction phenomenon and a second refraction phenomenon as a ray of first outgoing light having a prescribed outgoing angle; and
a total reflection prism portion for making a ray of second incident light having the prescribed incident angle go out according to a third refraction phenomenon, a total reflection phenomenon and a fourth refraction phenomenon as a ray of second outgoing light parallel to the ray of first outgoing light.
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Abstract
A Fresnel lens has a pitch including a hybrid prism comprising a refraction prism unit (3A) for emitting an incident light (li1) of an incident angle (a) as an outgoing light (lo1) of an outgoing angle (f) by two refractions, and a total reflection prism unit (4A) for emitting an incident light (li2) of an incident angle (a) as an outgoing light (lo2) parallel to the outgoing light (lo1) by a refraction, a total reflection, and a refraction.
21 Citations
77 Claims
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1. A Fresnel lens, comprising:
a pitch area having a hybrid type prism portion which has both a refraction type prism portion for making a ray of first incident light having a prescribed incident angle go out according to a first a refraction phenomenon and a second refraction phenomenon as a ray of first outgoing light having a prescribed outgoing angle; and
a total reflection prism portion for making a ray of second incident light having the prescribed incident angle go out according to a third refraction phenomenon, a total reflection phenomenon and a fourth refraction phenomenon as a ray of second outgoing light parallel to the ray of first outgoing light. - View Dependent Claims (2, 23, 24, 25)
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3. A Fresnel lens, in which a ray of incident light having a prescribed incident angle goes out through a prism portion as a ray of outgoing light having a prescribed outgoing angle for each pitch area, comprising:
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a plurality of pitch areas respectively having a hybrid type prism portion which has both a refraction type prism portion and a total reflection prism portion integrally formed with each other, wherein a sectional shape of the refraction type prism portion of each pitch area is formed by;
a first incident plane for changing a ray of first incident light incident at a prescribed incident angle to a ray of first transmitted light according to a first refraction phenomenon;
a plane-shaped outgoing plane for changing the ray of first transmitted light obtained on the first incident plane to a ray of first outgoing light having a prescribed outgoing angle according to a second refraction phenomenon; and
an ineffective plane connecting with the first incident plane and an adjacent pitch area, a sectional shape of the total reflection type prism portion of each pitch area is formed by;
a second incident plane for changing a ray of second incident light incident at the prescribed incident angle to a ray of second transmitted light according to a third refraction phenomenon;
a total reflection plane for changing the ray of second transmitted light obtained on the second incident plane to a ray of third transmitted light parallel to the ray of first transmitted light according to a total reflection phenomenon; and
the outgoing plane of the refraction type prism portion, the ray of third transmitted light obtained in the total reflection plane is changed to a ray of second outgoing light having the prescribed outgoing angle according to a fourth refraction phenomenon on the outgoing plane, and a portion of the ray of second incident light not changed to the ray of third transmitted light is received as the ray of first incident light. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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26. A Fresnel lens, comprising:
a plurality of total reflection type prism portions which are arranged on a light incident side and respectively have both a second incident plane, on which a plurality of rays of light are incident, and a total reflection plane on which a part of the rays of light are totally reflected and are deflected in a desired direction, wherein each total reflection type prism portion has a subsidiary unit-prism portion arranged in a part of the second incident plane on which a ray of light expected not to be totally reflected on the total reflection plane is incident, and the subsidiary unit-prism portion functions as a refraction type prism portion having a first incident plane on which the ray of incident light is refracted to be deflected in the desired direction. - View Dependent Claims (27, 28, 29, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71)
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30. A Fresnel lens, comprising:
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a plurality of refraction type prism portions which are arranged on a light incident side and respectively have both a first incident plane, on which a ray of incident light is refracted to be deflected in a desired direction, and an ineffective plane different from the first incident plane, wherein each refraction type prism portion has a subsidiary unit-prism portion arranged on the first incident plane, a ray of light expected to be incident on the ineffective plane of another adjacent refraction type prism portion placed on a Fresnel periphery side is received in the subsidiary unit-prism portion, and the subsidiary unit-prism portion functions as a total reflection type prism portion having both a second incident plane, on which a ray of light is received, and a total reflection plane on which the ray of light received on the second incident plane is totally reflected to be deflected in the desired direction. - View Dependent Claims (31, 32, 33, 67)
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72. A method of manufacturing a lens forming mold, in which a lens forming mold is cut in a reversed shape of both a refractive type prism portion and a total reflection type prism portion formed for each pitch area of a Fresnel lens by using a cutting tool, comprising:
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a main unit-prism portion cutting step of cutting the lens forming mold in a reversed shape of the refractive type prism portion of a cutting pitch area by using the cutting tool; and
a subordinate unit-prism portion cutting step of cutting the lens forming mold in a reversed shape of the total reflection type prism portion of the cutting pitch area by using the cutting tool on condition that a plane obtained by extending a total reflection plane in the reversed shape of the total reflection type prism portion intersects a trough line placed between the cutting pitch area and another cutting area adjacent to the cutting pitch area on a Fresnel center side or pass through an area shifted from the trough line toward a light outgoing side, wherein the combination of the main unit-prism portion cutting step and the subordinate unit-prism portion cutting step is repeatedly performed by a prescribed number equal to the number of cutting pitch areas. - View Dependent Claims (74, 77)
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73. A method of manufacturing a lens forming mold, in which a lens forming mold is cut in a reversed shape of both a refractive type prism portion and a total reflection type prism portion formed for each pitch area of a Fresnel lens by using a cutting tool, comprising:
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a main unit-prism portion cutting step of cutting the lens forming mold in a reversed shape of the total reflection type prism portion of a cutting pitch area by using the cutting tool; and
a subordinate unit-prism portion cutting step of cutting the lens forming mold in a reversed shape of the refractive type prism portion of the cutting pitch area by using the cutting tool on condition that a plane obtained by extending a first incident plane in the reversed shape of the refractive type prism portion intersects a trough line placed between the cutting pitch area and another cutting area adjacent to the cutting pitch area on a Fresnel periphery side or pass through an area shifted from the trough line toward a light outgoing side, wherein the combination of the main unit-prism portion cutting step and the subordinate unit-prism portion cutting step is repeatedly performed by a prescribed number equal to the number of cutting pitch areas. - View Dependent Claims (75, 76)
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Specification