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US 7,581,840 B2Granted
Focus regulator and projection apparatus having same
AssigneeSamsung Electronics Co., Ltd.
InventorMin-Chul Kim
Life of this patent
Estimating the term…
Abstract
A focus regulator is provided for simplifying and minimizing the structure of an image projector. The focus regulator includes a controller rotatably formed on a main body to be limitedly movable in the direction of the optical axis. A focus lens unit is affixed to the projection lens unit of the main body to be movable in the direction of the optical axis (OX) by being rotated with the controller.
Claims5
A projection apparatus, comprising:
- a main body;
- an illuminating optical system formed on the main body that generates and emits light;
- an image formation unit formed on the main body that converts the light emitted by the illuminating optical system into an optical image;
- a projection lens unit that receives the optical image converted by the image formation unit;
- a focus lens unit affixed to the projection lens unit and adapted to move in a direction of an optical axis (OX) when rotated;
- and
- a controller rotatably formed on the main body that transmits rotary power to the focus lens unit and is adapted not to move in the direction of the optical axis (OX),
- wherein the controller includes a ring-shaped body into which one end of the focus lens unit is selectively inserted in an inner portion thereof,
- wherein the main body includes
- a base that supports the projection unit;
- a cover formed on the base and having an opening for inserting a first end of the controller;
- and
- a mask formed on the cover to cover a side of the cover in which the cover opening is formed and having a mask opening adapted to receive a second end of the controller, the controller having limited movement in a direction of an optical axis (OX) by means of the cover and the mask.
10 more elements
Dependencies are inferred from the claim text.