Ultra-small-sized 4K-resolution ultra-short-focus projection optical system
AssigneeUnion Optech Co., Ltd.
InventorJunqiang Gong
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Abstract
The present invention discloses an ultra-small-sized 4K-resolution ultra-short-focus projection optical system, which is characterized by including in sequence in a projection direction: a DMD chip, an equivalent prism, a 4K oscillating mirror, a refraction lens assembly and an aspherical reflector. Through reasonable distribution of focal power, the semi-aperture size of the reflector is reduced to be less than 50 mm, and the assembling sensitivity is substantially reduced, so that batch production can be realized.
Claims10
An ultra-small-sized 4K-resolution ultra-short-focus projection optical system, characterized by comprising in sequence in a projection direction:
- a DMD chip, an equivalent prism, a 4K oscillating mirror, a refraction lens assembly and an aspherical reflector, wherein the refraction lens assembly comprises in sequence along the projection direction:
- a first lens group capable of moving back and forth relative to the DMD chip, a second lens group capable of moving back and forth relative to the DMD chip and a third lens group which is static relative to the DMD chip;
- the first lens group has positive focal power;
- the second lens group has positive focal power;
- and the third lens group has negative focal power.
Dependencies are inferred from the claim text.