Patent ID: 11966071
Assignee: SHARP DISPLAY TECHNOLOGY CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G | IPC F

Claim 4:
5. An illumination device comprising:
a first sheet including a first light entering main surface being one main surface disposed along a first direction, a first light emission main surface being another main surface along the first direction, two first light blocking portions disposed at an interval in the first direction, and a first light-transmitting portion disposed between the two first light blocking portions;
a second sheet including a second light entering main surface being one main surface disposed along the first direction and configured to face the first light emission main surface, a second light emission main surface being another main surface along the first direction, and a first lens disposed on the second light entering main surface or the second light emission main surface; and
a third sheet including a third light entering main surface being one main surface disposed along the first direction and configured to face the second light emission main surface, a third light emission main surface being another main surface along the first direction, two second light blocking portions disposed at an interval in the first direction, and a second light-transmitting portion disposed between the two second light blocking portions,
wherein the first lens includes a first inclined surface having an inclination rising from an end side in the first direction in the second sheet toward a central side,
the third sheet has a ratio acquired by dividing a width of the second light-transmitting portion by a height of the second light-transmitting portion greater than a ratio acquired by dividing a width of the first light-transmitting portion by a height of the first light-transmitting portion,
a plurality of first lenses, including the first lens, is disposed side by side in the first direction,
the plurality of first lenses includes a central side lens and an end side lens located closer to the end side in the first direction in the second sheet than the central side lens, and
an angle formed by the first inclined surface of the end side lens with respect to the first direction is greater than an angle formed by the first inclined surface of the central side lens with respect to the first direction.