Projection optical system and projection equipment
A projection optical system and light technology, applied in optics, optical components, instruments, etc., can solve the problems of a large number of mirror groups, and the difficulty of assembling and assembling projection equipment.
Pending Publication Date: 2020-11-06
UNION OPTECH
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Problems solved by technology
[0003] The main purpose of the present invention is to provide a projection optical system, which aims to solve the problem that the number of mirror groups in the optical system of the projection device is large, which leads to the difficulty of assembling and assembling the projection device
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[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0059] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.
[0060] In addition, the ...
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The invention provides a projection optical system, which sequentially comprises a display unit, a third lens group, a second lens group and a first lens group along the light transmission direction,wherein the first lens group has negative focal power, the second lens group has positive focal power, the third lens group has positive focal power, the projection optical system further comprises amoving assembly, and the moving assembly is connected with the first lens group, the second lens group and the third lens group so as to drive the first lens group, the second lens group and the thirdlens group to move together, so that the image plane position of the projection optical system does not move in the zooming process, repeated focusing is not needed under the same projection distance, and the picture is still clear. According to the technical scheme, the focal power of the projection optical system is reasonably distributed, the total length of the projection optical system is reduced, the first lens group, the second lens group and the third lens group are arranged in a linkage mode, and the effect of keeping pictures clear in the zooming process is achieved.
Description
technical field [0001] The invention relates to the technical field of optical imaging, in particular to a projection optical system and projection equipment. Background technique [0002] The projection equipment can project pictures of different sizes in a fixed space, and its flexibility and convenience make the projection equipment can be used in different occasions. The display unit and the optical system are the core components of the projection equipment. Most of the projection lenses currently on the market are designed by combining multiple mirror groups. The number of mirror groups is usually greater than 4. When it is large, the number of mirror groups usually exceeds 7, which seriously increases the difficulty of assembly and assembly of projection equipment. Contents of the invention [0003] The main purpose of the present invention is to provide a projection optical system, aiming to solve the problem that the assembly and assembly of the projection equipme...
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Login to View More IPC IPC(8): G02B15/16G02B15/14G03B21/14
CPCG02B15/16G03B21/142G02B15/143507
Inventor 全丽伟李建华
Owner UNION OPTECH