Lens array group and projector

Abstract

The invention discloses a lens array group and a projector, wherein the lens array group used in the projector comprises a first lens array and a second lens array; the first lens array comprises a plurality of first lens units, each first lens unit is a rectangle, and one side edge of the rectangle is defined as a first direction; the second lens array is parallel to the first lens array, and comprises a plurality of second lens units, each second lens unit is a rectangle, one side edge of the rectangle is defined as a second direction, and the second lens units are arranged corresponding to the first lens units; the center of one first lens unit is coaxial with the center of the corresponding second lens unit, and based on the dissimilarity degree of the rectangles of the first and second lens units, the first direction forms a rotation angle relative to the second direction. When the lens array group is used in the projector, a light source can effectively provide lights required by the imaging of a micro-display device, thereby reducing the light loss.

Description

technical field [0001] The invention relates to a lens group for a projection device, in particular to a lens group for reducing internal light loss of the projection device. Background technique [0002] Since Light Emitting Diodes (LEDs) have the advantages of long service life, low operating temperature, and instant switchability, they are gradually replacing Ultra High Performance (UHP) bulbs as light sources for projection devices. When a light emitting diode is used as a light source of a projection device, the design and adjustment of its internal optical components also need to be considered in order to obtain better light utilization and uniformity of light distribution. [0003] With regard to light utilization, since most light emitting diodes are made in a square shape, the projected shape of the light emitted by the light emitting diodes is also substantially square. However, when a square light is projected to a non-square micro-display device (Micro-display d...

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Problems solved by technology

However, as mentioned above, the lens unit 131 needs to be designed in accordance with the shape of the lens unit 141. Therefore, the lens array group cannot change the light projection shape of the LED 12, and in the second optical path, the light projection shape will be different from that of the light projection. The problem of light loss caused by the different shapes and proportions of the micro-display device 15

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