Disclosed is an ultra thin optical scanning device for a portable information device, which includes an LED as a light source and totally reflects light from an object-side surface to form an image, thereby increasing a contrast ratio of the image and improving the resolution thereof. The ultra thin optical scanning device includes a light emitting device that emits light for sensing an object, an object-side surface contacting the object and totally reflecting the light emitted from the light emitting device, an image formation part collecting the light totally reflected by the object-side surface, and transmitting the light, and a light receiver part forming an image by using the light transmitted by the image formation part.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An ultra thin optical scanning device for a portable information device, comprising: a light emitting device that emits light for sensing an object; a condensing lens that collects the light emitted from the light emitting device and emits the light in parallel to an optical axis of the light emitting device, and has a plurality of concentric Fresnel patterns; an object-side surface contacting the object and totally reflecting the light emitted from the light emitting device; an optical path changer part having reflective surfaces with a reflective coating layer formed thereon and refractive surfaces having no reflective coating layer, the optical path changer part guiding a path of the light emitted from the light emitting device to the object-side surface; an image formation part collecting the light totally reflected by the object-side surface, and transmitting the light; and a light receiver part forming an image by using the light transmitted by the image formation part, wherein the light which is reflected from the reflective surface arrives at the object-side with an incidence angle which is equal to or greater than a critical angle, wherein the light which is not reflected from the reflective surface arrives at the object-side with an incidence angle which is smaller than the critical angle, and wherein the critical angle satisfies a total reflection condition, and wherein the incidence angle of the light totally reflected by the object-side surface and collected by the image formation part is within 15° based on an optical axis.
2. The ultra thin optical scanning device of claim 1 , wherein the condensing lens is a Fresnel lens.
3. The ultra thin optical scanning device of claim 1 , wherein the light guided to the object-side surface by the optical path changer part forms an incidence angle such that the light is totally reflected from the object-side surface.
4. The ultra thin optical scanning device of claim 1 , wherein the light emitting device is a light emitting diode (LED).
5. The ultra thin optical scanning device of claim 4 , wherein the LED is a blue LED.
6. The ultra thin optical scanning device of claim 1 , further comprising a re-reflection surface that totally reflects the light totally reflected by the object-side surface to the image formation part.
7. The ultra thin optical scanning device of claim 1 , wherein the image formation part is a Fresnel lens.
8. The ultra thin optical scanning device of claim 1 , wherein the image formation part is an array lens.
9. The ultra thin optical scanning device of claim 1 , wherein the object-side surface, the image formation part, and the optical path changer part are integrally formed with a main body.
10. The ultra thin optical scanning device of claim 6 , wherein the object-side surface, the image formation part, and the re-reflection surface are integrally formed with a main body.
11. The ultra thin optical scanning device of claim 9 , wherein an assembly guide is disposed in a side portion of the main body.
12. An ultra thin optical pointing device for a portable information device, comprising: a light emitting device that emits light for sensing an object; a condensing lens that collects the light emitted from the light emitting device and emits the light in parallel to an optical axis of the light emitting device, and has a plurality of concentric Fresnel patterns; an object-side surface contacting the object and totally reflecting the light emitted from the light emitting device; an optical path changer part having reflective surfaces with a reflective coating layer formed thereon and refractive surfaces having no reflective coating layer, the optical path changer part guiding a path of the light emitted from the light emitting device to the object-side surface; an image formation part collecting the light totally reflected by the object-side surface, and transmitting the light; a light receiver part forming an image by using the light transmitted by the image formation part; a calculation part detecting a movement of the object by using the image, to calculate a coordinate value; and a display part displaying a pointer according to the calculated coordinate value, wherein the light which is reflected from the reflective surface arrives at the object-side with an incidence angle which is equal to or greater than a critical angle, wherein the light which is not reflected from the reflective surface arrives at the object-side with an incidence angle which is smaller than the critical angle, and wherein the critical angle satisfies a total reflection condition, and wherein the incidence angle of the light totally reflected by the object-side surface and collected by the image formation part is within 15° based on an optical axis.
13. The ultra thin optical pointing device of claim 12 , further comprising a re-reflection surface that totally reflects the light totally reflected by the object-side surface, to the image formation part.
14. The ultra thin optical pointing device of claim 12 , wherein the object-side surface, the image formation part, and the optical path changer part are integrally formed with a main body.
15. The ultra thin optical pointing device of claim 13 , wherein the object-side surface, the image formation part, and the re-reflection surface are integrally formed with a main body.
16. The ultra thin optical scanning device of claim 10 , wherein an assembly guide is disposed in a side portion of the main body.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
December 14, 2010
February 23, 2016
Browse 5M+ US patents with plain-English claim translations and AI-generated analysis.