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US 7,611,248 B2Granted
Projection lens unit and thin projector using the same
AssigneeLG Electronics Inc.
InventorsNam Sik Kim, Seung Gyu Lee, Han Kyoung Cho, Ki So Bok, Jun Ho Lee, Soon Hyung Kwon
Life of this patent
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Abstract
A projection lens unit and a thin projector using the same are disclosed. The projection lens unit includes a plurality of lens sets for emitting light carrying an image, and a reflector arranged between adjacent ones of the lens sets or at a downstream end of the lens sets, and adapted to change a direction of light incident on the reflector.
Claims19
A projection lens unit, comprising:
- a plurality of lens sets for emitting light carrying an image;
- and
- a reflector arranged between adjacent ones of the lens sets or at a downstream end of the lens sets, and adapted to change a direction of light incident on the reflector,
- wherein the plurality of lens sets comprise
- a first lens set including at least one focus adjusting lens,
- a second lens set, separate from the first lens set, and including at least one zoom lens,
- a third lens set including at least one compensation lens, and
- a fourth lens set including at least one master lens, and
- wherein the first lens set, the second lens set, and the third lens set are arranged in parallel to a central axis of the light reflected from the reflector in an aligned manner and perpendicularly to a central axis of the light emitted from the fourth lens set.
6 more elements
A projection lens unit, comprising:
- a master lens set adapted to emit light carrying a produced image;
- a reflector arranged downstream from the master lens set, and adapted to change a direction of the light emitted from the master lens set;
- a compensation lens set adapted to compensate light reflected from the reflector;
- a zoom lens set adapted to adjust a focal length of light emitted from the compensation lens set;
- and
- a focus adjusting lens set, separate from the zoom lens set, adapted to adjust a focus of light emitted from the zoom lens set, and to externally emit the focus-adjusted light,
- wherein the compensation lens set, the zoom lens set, and the focus adjusting lens set are arranged in parallel to a central axis of the light reflected from the reflector in an aligned manner and perpendicularly to a central axis of the light emitted from the master lens set.
4 more elements
A thin projector comprising:
- a housing having a panel shape including a front side, a rear side, a top side, and opposite lateral sides;
- an illumination unit arranged in the interior of the housing, the illumination unit generating light and emitting the generated light;
- a micro device arranged in the interior of the housing, the micro device receiving the light from the illumination unit and producing an image using the received light;
- a projection lens unit arranged in the interior of the housing, the projection lens unit including a plurality of lens sets for emitting the image produced by the micro device, and a reflector arranged between adjacent ones of the lens sets or at a downstream end of the lens sets, and adapted to change a direction of light incident on the reflector, one of the lens units and reflector being arranged to be externally exposed through the front side of the housing;
- a connector adapted to fix the housing such that the housing is arranged in an upright state;
- air inlets formed at the lateral side of the housing where the projection lens unit is arranged and at the bottom side of the housing where the circuit is arranged;
- and
- an air outlet formed at the top side of the housing where the illumination unit is arranged,
- wherein the plurality of lens sets comprise
- a first lens set including at least one focus adjusting lens,
- a second lens set, separate from the first lens set, and including at least one zoom lens,
- a third lens set including at least one compensation lens, and
- a fourth lens set including at least one master lens.
10 more elements
Dependencies are inferred from the claim text.