TW201530246A - Projector and projection lens and projection method thereof - Google Patents

Abstract

A projector comprises an image light source generator and a projection lens, wherein the image light source generator is used to generate an image light beam. The projection lens comprises a relay optical system and a projection optical system. The relay optical system is used to receive the image light beam. The projection optical system comprises at least one lens and a reflector. Thus, when the image light source generator produces the image light beam, the image light beam passes through the relay optical system and penetrates at least one lens, and is reflected by the reflector and then passed through at least one lens and emitted from the projection lens and projected to the imaging surface. In addition, this invention also discloses the structure of the projector projection lens and projection method.

Description

Projector, projection lens and projection method thereof

The invention relates to an optical projection device; in particular to a projector, a projection lens thereof and a projection method.

With the advancement of video technology, projectors are becoming more and more popular, and the projection lens for clearly displaying images on the screen is one of the core components.

With the limitation of the use space, in order to achieve the effect of clear projection in a small space, the projection lens of the projector is gradually designed in the direction of the short-focus projection lens, but the short projection can also have a good projection effect. A focal lens typically uses a larger number of larger lenses to achieve short-focus and high optical power.

In this way, the conventional short-throw projection lens is not only bulky and heavy, but cannot achieve the design of miniaturization and light weight that is advocated today, and because the internal lens is both heavy and heavy, it takes a long time to manufacture. Working hours, and the material cost is also relatively expensive.

Based on the above, it can be known that the optical design of the known projector and projection lens is still not perfect, and there is room for improvement.

In view of this, the object of the present invention is to provide a projector, a projection lens thereof and a projection method, which can effectively reduce the size and cost, and have high optical performance.

In order to achieve the above object, the present invention provides a projector including an image light source generating device and a projection lens, wherein the image light source generating device is used to generate an image beam. The projection lens is configured to receive the image beam and project to an image plane, and includes a relay optical system sequentially arranged from a side close to the image light source generating device to a side away from the image light source generating device. a projection optical system for receiving the image beam, the projection optical system for projecting the image beam toward the imaging surface, and comprising at least one lens and a mirror, the at least one lens Located between the mirror and the relay optical system, the at least one lens has a first optical side and a second optical side, and the first optical side is closer to the relay optical system than the second optical side.

Thereby, when the image light source generating device generates the image light beam, the image light beam passes through the relay optical system, and at least one lens is incident from the first optical side, and the at least one lens is separated from the second optical side. After being reflected by the mirror, the image beam is re-injected into the at least one lens from the second optical side, and then the first optical side is separated from the at least one lens and projected onto the imaging surface.

According to the above concept, the present invention further provides a projection lens including a relay optical system and a projection optical system, the projection optical system including at least one lens and a mirror, and the at least one lens is located at the mirror and the mirror Between the relay optical systems, the at least one lens has a first optical side and a second optical side, and the first optical side is closer to the relay optical system than the second optical side.

Thereby, when a light beam passes through the relay optical system, and the at least one lens is incident from the first optical side, and then the second optical side leaves the at least one lens and is reflected by the mirror, the light beam The at least one lens is re-injected from the second optical side, and the at least one lens is separated from the first optical side.

According to the above concept, the present invention further provides a projection method of a projector, comprising the steps of: A. generating an image beam by the image source generating device; B. causing the image beam to be incident on the projection lens; C. Passing the image beam through the relay optical system, and injecting at least one lens from the first optical side, and then leaving the at least one lens from the second optical side; D. reflecting the image beam by the mirror; E. The image beam is again incident on the at least one lens from the second optical side, and the first optical side is separated from the at least one lens; F. the image beam is emitted from the projection lens and projected onto the imaging surface.

In this way, through the design of the projector and its projection lens and projection method, the purpose of reducing the volume and cost can be effectively achieved, and the optical performance is high.

100‧‧‧Projector

10‧‧‧Image light source generating device

P‧‧‧Image Beam

20‧‧‧Projection lens

22‧‧‧Relay optical system

F‧‧‧Filter

L1~L11‧‧ lens

24‧‧‧Projection optical system

G‧‧‧Lens Group

L12, L13‧‧ lens

S1‧‧‧ first optical side

S2‧‧‧ second optical side

R‧‧‧Mirror

T‧‧‧ test location

200‧‧‧ curtain

22'‧‧‧In the relay optical system

L8', L9', L10'‧‧ lens

1 is a structural view of a projector according to a first embodiment of the present invention; FIG. 2 is a structural view of a projection lens according to a first preferred embodiment of the present invention; FIG. 3 discloses that an image beam is projected through a projection lens to an imaging surface; Embodiment A structural diagram of a projection lens.

In order to explain the present invention more clearly, the preferred embodiment will be described in detail with reference to the accompanying drawings. FIG. 1 shows a projector 100 according to a preferred embodiment of the present invention. The device 10 and a projection lens 20. The image light source generating device 10 is configured to read image information of an image source, and has one piece of 稜鏡F, and generates an image beam P corresponding to the image beam P according to the read image information. The projection lens 20 is configured to receive the image beam P and perform optical processing of a predetermined effect to project onto an imaging surface. The projection lens 20 includes a relay optical system 22 and a projection optical system 24 arranged in sequence from a side close to the image light source generating device 10 to a side away from the image light source generating device 10. For example, referring to FIG. 2, in the embodiment, the relay optical system 22 includes 11 lenses L1~L11 (including single-layer lenses L1~L2, L5~L11 and composite lenses L3, L4), and its function is The image beam P is received and transmitted to the projection optical system 24 in accordance with the desired optical effect. Of course, in actual implementation, the number of lenses and the shape of the lens are not limited thereto, and may be adjusted and changed according to the requirements of different optical designs.

1 and 2, the projection optical system 24 includes a lens group G and a mirror R. The lens group G is located between the mirror R and the relay optical system 22, and includes two lenses L12. L13 (including the single-layer lens L13 and the composite lens L12), and the lens group G has a first optical side S1 and a second optical side S2, and the first optical side S1 is closer to the second optical side S2. Relay optical system 22. The mirror surface of the mirror R facing the lens group G is a concave mirror and is an aspherical surface, and the mirror diameter of the mirror R (ie, the distance between the upper and lower ends) is between the relay optical system 22 and the projection optical system 24 . The lens diameter of the lens with the largest mirror diameter is between 0.5 and 1.5 times. Of course, in practical implementation, the mirror surface of the mirror R facing the lens group G can also be changed to a spherical mirror surface or other free curved surface according to different optical requirements. In addition, in the embodiment, the mirror R has a mirror diameter of 62 mm. The lens L11 having the largest mirror diameter has a mirror diameter of 80 mm. In other words, the mirror diameter of the mirror R is 0.775 times the mirror diameter of the lens L11 having the largest mirror diameter.

In addition, the projection lens will meet the following conditions: -20 ≦ CRA ≦ 20

The above CRA is the chief ray angle of the projection optical system 24. In the present embodiment, the main ray angle measured at the test position T shown in FIG. 2 and measured at a normalized field value of 1.0 (ie, the most edge) is 7.542.

Therefore, referring to FIG. 3 , and referring to FIG. 1 and FIG. 2 , when the image light source generating device 10 generates the image light beam P, the image light beam P enters the projection lens 20 and passes through the relay optical system 22 first. And entering the lens group G from the first optical side S1, and then leaving the lens group G from the second optical side S2 and being specularly reflected by the mirror R, the image light beam P is from the second optical The side S2 is again incident on the lens group G, and then the first optical side S1 leaves the lens group G, and penetrates the lens L11 of the relay optical system 22 that is closest to the projection optical system, and then the projection lens 20 is projected and projected onto a curtain 200 (ie, an image plane). It should be noted that the image beam P is reflected by the mirror R of the projection optical system described above, and the lens group G is repeatedly penetrated by the image beam P to achieve a secondary optical effect design, even if the lens size is reduced. The design with high volume can also effectively achieve high optical performance, and can effectively achieve short-focus and miniaturization effects.

In addition, it can be seen from FIG. 2 that the number of optical elements (ie, lenses L1 to L11) of the relay optical system 22 of the present invention is greater than the optical elements of the projection optical system 24 (ie, lenses L12 to L13 and mirror R). The purpose of this design is to provide a better optical effect when the image beam P passes through the relay optical system 22, and to provide a good projection imaging effect when the short-focus projection is provided.

Furthermore, the image generated by the image light source generating device 10 When the image beam P is emitted from the first optical side S1, the area of the first optical side of the lens group G (ie, the lens surface of the lens L12 facing the mirror surface S of the relay optical system 22) is not larger than the total area of the mirror surface S. One-of-a-half. In addition, in the last lens (ie, lens L11) that the image beam P passes before exiting the projection lens 20, the optical path before being reflected by the mirror R is not reflected by the optical path reflected by the mirror R. Interlaced to avoid optical interference to improve the quality of projection imaging.

It is worth mentioning that, in order to improve the optical performance more effectively, as shown in FIG. 4, part of the lens in the relay optical system 22' (ie, the lens L8' may be affected without affecting the optical effect. The lens of L9', L10') is cut or polished so that the image beam reflected by the mirror R does not penetrate the lenses L8', L9', L10', thereby effectively avoiding optical interference. The situation occurs, which in turn achieves the effect of thinning and improving optical performance.

The above is only a preferred embodiment of the present invention, and equivalent changes to the scope of the present invention and the scope of the patent application are intended to be included in the scope of the present invention.

100‧‧‧Projector

10‧‧‧Image light source generating device

20‧‧‧Projection lens

22‧‧‧Relay optical system

24‧‧‧Projection optical system

G‧‧‧Lens Group

R‧‧‧Mirror

200‧‧‧ curtain

Claims (14)

A projector comprising: an image light source generating device for generating an image beam; and a projection lens for receiving the image beam and projecting to an image plane, and including the self-adjacent image source generating device One of the relay optical systems and a projection optical system are sequentially arranged from a side of the image light source generating device, wherein the relay optical system is configured to receive the image light beam, and the projection optical system is configured to receive the image The light beam is projected toward the imaging surface, and includes at least one lens and a mirror, the at least one lens is located between the mirror and the relay optical system, and the at least one lens has a first optical side and a a second optical side, and the first optical side is closer to the relay optical system than the second optical side; thereby, when the image light source generating device generates the image light beam, the image light beam passes through the relay optical system, and The at least one lens is incident from the first optical side, and the second optical side is separated from the at least one lens and reflected by the mirror. The optical image beam from the second side of the at least one re-enters the lens, and then leave from the first side of the at least one optical lens and projected onto the imaging plane. The projector of claim 1, wherein the image light beam generated by the image light source generating device is reflected by the mirror and is separated from the at least one lens by the first optical side, and penetrates the relay optical system. Part of the lens is projected onto the imaging surface. The projector of claim 1 or 2, wherein the image light source generated by the image light source generating device is projected into the last lens passed by the image, and the image beam is reflected by the mirror The path does not intersect the optical path of the image beam that is reflected by the mirror. The projector of claim 1, wherein the image light beam generated by the image light source generating device passes through the first optical side and is not larger than one-half of the total optical side. . A projection lens includes a relay optical system and a projection optical system, the projection optical system including at least one lens and a mirror, and the at least one lens is located between the mirror and the relay optical system, and the At least one lens has a first optical side and a second optical side, and the first optical side is closer to the relay optical system than the second optical side, wherein when an image beam passes through the relay optical system, And the at least one lens is incident from the first optical side, and the second optical side is separated from the at least one lens and reflected by the mirror, and the light beam is re-injected into the at least one lens from the second optical side. And leaving the at least one lens from the first optical side. The projection lens of claim 5, wherein the mirror has a mirror diameter between 0.5 and 1.5 times the mirror diameter of the relay optical system and the lens of the largest mirror diameter in the projection optical system. The projection lens of claim 5 further satisfies the following condition: -20 ≦ CRA ≦ 20, wherein CRA is the chief ray angle of the projection lens. The projection lens of claim 5, wherein the mirror faces the mirror of the at least one lens as a concave mirror. The projection lens of claim 8, wherein the mirror faces the mirror surface of the at least one lens as an aspherical surface. The projection lens of claim 5, wherein the number of lenses of the relay optical system is greater than the number of lenses of the projection optical system. A projection method of the projector according to claim 1, comprising the steps of: A. generating an image beam by the image source generating device; B. causing the image beam to be incident on the projection lens; C. passing the image beam through The relay optical system, and injecting at least one lens from the first optical side, and then leaving the at least one lens from the second optical side; D. reflecting the image beam by the mirror; E. making the image beam from The second optical side is again incident on the at least one lens, and the first optical side is separated from the at least one lens; F. the image beam is emitted from the projection lens and projected onto the imaging surface. The projection method of the projector according to claim 11, wherein in the step E, the image beam is separated from the at least one lens by the first optical side, penetrates a part of the lens of the relay optical system, and is projected to the lens. Imaging surface. The projection method of the projector according to claim 11 or 12, wherein in step E, the optical path of the image beam in the last lens passed before the projection lens is emitted does not intersect the optical path of step C. The projection method of the projector according to claim 13, wherein in step E, the area of the mirror surface closest to the first optical side through the at least one lens when the image beam is emitted by the first optical side is not greater than One-third of the total area of the mirror.