Surface light emission device, method of manufacturing the same, and liquid crystal display device
First Claim
1. A surface light emitting device, characterized by comprising a light source and a light introduction plate having a structure for causing the light from the light source to be incident from a side end surface and causing the light to outgo from a light outgoing surface, wherein a plurality of grooves each composed of a gentle slanting surface and a steep slanting surface having a slanting angle steeper than that of the gentle surface are periodically formed in a stripe shape on the opposing surface of the light introduction plate opposite to the light outgoing surface, and a groove having a larger distance from the light source of the grooves is formed deeper as well as the difference between the depths of adjacent grooves is made larger as they have a distance longer from the light source.
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Accused Products
Abstract
A surface light emitting device includes a light source and a light introduction plate having a structure for causing the light from the light source to be incident from a side end surface and to outgo from a light outgoing surface. Grooves are formed in a stripe shape on an opposing surface opposite to the light outgoing surface, and the grooves are formed deeper as they have a longer distance from the light source, and the difference between the depths of adjacent grooves is made larger as they have a distance longer from the light source. A method of manufacturing the surface light emitting device and a liquid crystal device including the surface light emitting device are also disclosed. With this arrangement, the surface light emitting device can obtain a sufficiently quantity of light at any position and the liquid crystal device can display an image in uniform brightness.
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Citations
16 Claims
- 1. A surface light emitting device, characterized by comprising a light source and a light introduction plate having a structure for causing the light from the light source to be incident from a side end surface and causing the light to outgo from a light outgoing surface, wherein a plurality of grooves each composed of a gentle slanting surface and a steep slanting surface having a slanting angle steeper than that of the gentle surface are periodically formed in a stripe shape on the opposing surface of the light introduction plate opposite to the light outgoing surface, and a groove having a larger distance from the light source of the grooves is formed deeper as well as the difference between the depths of adjacent grooves is made larger as they have a distance longer from the light source.
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9. A method of manufacturing a surface light emitting device, characterized by comprising a step of producing a casting mold by flatly machining one surface of a casting mold substrate at a predetermined pitch and by forming a plurality of grooves in a stripe shape to the step portions formed on the surface of the casting mold substrate by the flat machining at the pitch;
- a step of producing a metal mold from the casting mold;
a step of producing a light introduction plate by injection molding using the metal mold; and
a step of disposing a light source to the light introduction plate, wherein a groove having a larger distance from the light source of the plurality of grooves is formed deeper as well as the difference between the depths of adjacent grooves is made larger as they have a distance longer from the light source.
- a step of producing a metal mold from the casting mold;
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10. A method of manufacturing a surface light emitting device, characterized by comprising a step of producing a metal mold by flatly machining one surface of a metal mold substrate at a predetermined pitch and by forming a plurality of grooves in a stripe shape to the step portions formed on the surface of the metal mold substrate by the flat machining at the pitch;
- a step of producing a light introduction plate by injection molding using the metal mold; and
a step of disposing a light source to the light introduction plate, wherein a groove having a larger distance from the light source of the plurality of grooves is formed deeper as well as the difference between the depths of adjacent grooves is made larger as they have a distance longer from the light source. - View Dependent Claims (11, 12, 13, 14, 15)
- a step of producing a light introduction plate by injection molding using the metal mold; and
Specification