CN203882076U - Projector and its projection lens - Google Patents

Abstract

A projector comprises an image light source generating device and a projection lens, wherein the image light source generating device is used for generating an image light beam. The projection lens comprises a relay optical system and a projection optical system, wherein the relay optical system is used for receiving the image light beam, and the projection optical system comprises at least one lens and a reflector. Therefore, when the image light source generating device generates the image light beam, the image light beam passes through the relay optical system, penetrates through the at least one lens, is reflected by the reflector, penetrates through the at least one lens again, and is emitted from the projection lens to be projected to the imaging surface. In addition, the utility model discloses still disclose the structure of this projector projecting lens.

Description

Projector and its projection lens

technical field

The utility model relates to an optical projection device; in particular, it refers to a projector and a projection lens.

Background technique

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

With the limitation of the use of space, in order to achieve a clear projection effect in a small space, the projection lens of the projector is gradually designed in the direction of a short-focus projection lens, but in order to have a good projection effect in a short distance, short Focal lenses usually use a large number of lenses with large volume to achieve the effect of short focal length and high optical power.

As a result, the existing short-focus projection lens is not only bulky and heavy, but cannot achieve the miniaturized and lightweight design advocated today, but also because the internal lenses are both heavy and heavy, so it takes a long time to manufacture. It takes a long time to assemble, and its material cost is also relatively expensive.

Based on the above, it can be seen that the known optical designs of projectors and projection lenses are still not perfect and need to be improved.

Utility model content

In view of this, the purpose of the present invention is to provide a projector and its projection lens, 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 comprising an image light source generating device and a projection lens, wherein the image light source generating device is used to generate an image light beam. The projection lens is used to receive the image light beam and project it onto an imaging surface, and includes a relay optical system and a sequentially arranged side from the side close to the image light source generating device to the side far away from the image light source generating device The projection optical system, the relay optical system is used to receive the image beam, the projection optical system is used to project the image beam to the direction of the imaging surface, and includes at least one lens and a mirror, and the at least one lens is located at 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.

Wherein, the image light beam generated by the image light source generating device is reflected by the reflector, leaves the at least one lens from the first optical side, passes through part of the lenses of the relay optical system, and then projects to the imaging noodle.

Wherein, the image light beam generated by the image light source generating device passes through the last lens projected to the imaging surface, the optical path before the image light beam is reflected by the reflector is the same as the image beam reflected by the reflector The subsequent optical paths do not intersect.

Wherein, the area through which the image light beam generated by the image light source generating device passes when it exits from the first optical side is not greater than 1/2 of the total area of the first optical side.

Thus, when the image light source generating device generates the image light beam, the image light beam passes through the relay optical system, enters at least one lens from the first optical side, and leaves the at least one lens from the second optical side , and after being reflected by the mirror, the image light beam enters the at least one lens from the second optical side again, leaves the at least one lens from the first optical side, and projects onto the imaging surface.

According to the above idea, the utility model also provides a projection lens, including a relay optical system and a projection optical system, the projection optical system includes at least one lens and a reflector, and the at least one lens is located between the reflector and the reflector 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.

Wherein, the mirror diameter of the reflecting mirror is between 0.5 times and 1.5 times of the mirror diameter of the lens with the largest mirror diameter in the relay optical system and the projection optical system.

Wherein, the following conditions are further satisfied: -20≤CRA≤20, wherein, CRA is the chief ray angle (Chief ray angle) of the projection lens.

Wherein, the mirror surface of the reflecting mirror facing the at least one lens is a concave mirror.

Wherein, the mirror surface of the reflection mirror facing the at least one lens is an aspheric surface.

Wherein, the number of lenses of the relay optical system is greater than the number of lenses of the projection optical system.

Thus, when a light beam passes through the relay optical system, enters the at least one lens from the first optical side, leaves the at least one lens from the second optical side, and is reflected by the mirror, the light beam It enters the at least one lens again from the second optical side, and exits the at least one lens from the first optical side.

In this way, through the above-mentioned design of the projector and its projection lens, the purpose of reducing the size and cost can be effectively achieved, and at the same time, it has the advantage of high optical performance.

Description of drawings

In order to illustrate the utility model more clearly, the following description will be given in conjunction with the preferred embodiments and accompanying drawings, wherein:

Fig. 1 is the structural diagram of projector of the present utility model;

Fig. 2 is the structural diagram of the projection lens of the first preferred embodiment of the utility model;

Figure 3 discloses that the image beam is projected to the imaging surface through the projection lens;

FIG. 4 is a structural diagram of a projection lens according to a second preferred embodiment of the present invention.

Detailed ways

Please refer to FIG. 1 , which is a projector 100 according to a preferred embodiment of the present invention, which includes an image light source generating device 10 and a projection lens 20 . The image light source generating device 10 is used to read image information from an image source, and has a prism F, and generates a corresponding image light beam P passing through the prism F according to the read image information. The projection lens 20 is used for receiving the image light beam P and projecting it to an imaging surface after undergoing optical processing with a predetermined effect. The projection lens 20 includes a relay optical system 22 and a projection optical system 24 sequentially arranged from a side close to the image light source generating device 10 to a side far away from the image light source generating device 10 . in:

Please refer to Fig. 2, in the present embodiment, this relay optical system 22 comprises 11 lenses L1-L11 (comprising single-layer lens L1-L2, L5-L11 and compound lens L3, L4), its function is to receive the The image light beam P is transmitted to the projection optical system 24 according to the required optical effect. Of course, in actual implementation, the number of lenses and the shape of the lenses are not limited thereto, and corresponding adjustments and changes can be made 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 single-layer lens L13 and compound 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 than the second optical side S2 Relay optical system 22 . The mirror surface of the reflector R facing the lens group G is a concave mirror and an aspherical surface, and the mirror diameter of the reflector R (that is, the distance between the upper and lower edges) is between the relay optical system 22 and the projection optical system The mirror diameter of the lens with the largest mirror diameter among 24 is between 0.5 times and 1.5 times. Of course, in practice, the mirror surface of the reflector R facing the lens group G can also be a spherical mirror surface or other free-form surfaces according to different optical requirements. In addition, in this embodiment, the mirror diameter of the reflecting mirror R is 62 mm, and the mirror diameter of the lens L11 with the largest mirror diameter is 80 mm. In other words, the mirror diameter of the mirror R is 0.775 times the mirror diameter of the lens L11 with the largest mirror diameter;

In addition, the projection lens will meet the following conditions:

-20≤CRA≤20

The above-mentioned CRA is the chief ray angle (Chief ray angle) of the projection optical system 24. In this embodiment, the chief ray angle measured at the test position T shown in FIG. 2 is 7.542 when the value of the normalized field is 1.0 (that is, the edge).

Therefore, please refer to FIG. 3 , and continue to refer to FIGS. 1 and 2 , when the image light source generating device 10 generates the image beam P, the image beam P enters the projection lens 20 and first passes through the relay optical system 22 , and enter the lens group G from the first optical side S1, and then leave the lens group G from the second optical side S2, and after being reflected by the mirror R, the image beam P emerges from the second optical Side S2 enters the lens group G again, leaves the lens group G from the first optical side S1, and penetrates the lens L11 of the relay optical system 22 closest to the projection optical system, and then passes through the projection lens 20 is projected onto a curtain 200 (ie, the imaging surface). What needs to be explained is that the reflection mirror R of the above-mentioned projection optical system reflects the image beam P, and the lens group G is repeatedly penetrated by the image beam P to achieve the secondary optical effect design, even if the lens size is reduced It can also effectively achieve the design of high optical performance, and can effectively achieve the effect of short focal length and miniaturization.

In addition, it can be seen from FIG. 2 that the number of optical elements (i.e. lenses L1-L11) of the relay optical system 22 of the present invention is greater than the number of optical elements (i.e. lenses L12-L13 and reflector R) of the projection optical system 24 , and the purpose of this design is to allow the image beam P to pass through the relay optical system 22 to produce a better optical effect, and to provide a short-focus projection while still having a good projection imaging effect.

Moreover, when the image light beam P generated by the image light source generating device 10 exits from the first optical side S1, the first optical side of the lens group G (that is, the lens L12 facing the relay optical system 22) passes through the first optical side. The area of the mirror surface S) is not greater than 1/2 of the total area of the mirror surface S. In addition, in the last lens (i.e. lens L11) that the image light beam P passes through before exiting the projection lens 20, the optical path before being reflected by the reflector R is different from the optical path after being reflected by the reflector R. Interlaced with each other, thereby avoiding optical interference and improving the quality of projection imaging.

It is worth mentioning that, in order to improve the optical performance more effectively, as shown in FIG. 4, without affecting the optical effect, part of the lenses in the relay optical system 22' (that is, the lens L8' , L9', L10') lenses are cut or ground so that the image beam reflected by the reflector R will not penetrate the lenses L8', L9', L10', which can effectively avoid optical interference situation occurs, thereby achieving the effect of thinning and improving optical performance.

The above description is only a preferred feasible embodiment of the utility model, and all equivalent changes made by applying the utility model description and the scope of the patent application should be included in the scope of the claims of the utility model.

Claims (10)

1. a projector, is characterized in that, comprising:

One image light-source generation device, produces an image strip; And

One projection lens, receive this image strip and be projected to an imaging surface, and include from a side that approaches this image light-source generation device to a relay optical system and a projection optical system of sequentially arranging away from a side of this image light-source generation device, wherein this relay optical system is in order to receive this image strip, this projection optical system is in order to the direction projection toward this imaging surface by this image strip, and include at least a slice lens and a catoptron, this at least a slice lens between this catoptron and this relay optical system, and this at least a slice lens there is one first optical side and one second optical side, and this first optical side this second optical side approaches this relay optical system,

Thus, in the time that this image light-source generation device produces this image strip, this image strip is by this relay optical system, and this first optical side is injected this at least a slice lens certainly, leave this at least a slice lens by this second optical side again, and by after the reflection of this catoptron, this image strip is injected this at least a slice lens once again from this second optical side, then leave this at least a slice lens and be projected to this imaging surface by this first optical side.

2. projector as claimed in claim 1, is characterized in that, this image strip that wherein this image light-source generation device produces, reflect by this catoptron, and leave this at least after a slice lens by this first optical side, penetrate the part lens of this relay optical system, then be projected to this imaging surface.

3. projector as claimed in claim 1 or 2, it is characterized in that, this image strip that wherein this image light-source generation device produces, in the last a slice lens that pass through before being projected to this imaging surface, optical path before this image strip is reflected by this catoptron, the optical path after being reflected by this catoptron with this image strip is non-intersect.

4. projector as claimed in claim 1, is characterized in that, this image strip that wherein this image light-source generation device produces, and the area passing through while ejaculation by this first optical side, is not more than 1/2 of this first optical side total area.

5. a projection lens, include a relay optical system and a projection optical system, this projection optical system includes at least a slice lens and a catoptron, and this at least a slice lens between this catoptron and this relay optical system, and this at least a slice lens there is one first optical side and one second optical side, and this first optical side this second optical side approaches this relay optical system, it is characterized in that:

When an image strip is by this relay optical system, and this first optical side is injected this at least a slice lens certainly, leave this at least a slice lens by this second optical side again, and by after this catoptron reflection, this light beam is injected this at least a slice lens once again from this second optical side, then leaves this at least a slice lens by this first optical side.

6. projection lens as claimed in claim 5, is characterized in that, wherein between 0.5 times to 1.5 times, the mirror footpath of the mirror footpath of this catoptron eyeglass in maximum mirror footpath in this relay optical system and this projection optical system.

7. projection lens as claimed in claim 5, is characterized in that, more meets the following conditions :-20≤CRA≤20, wherein, the chief ray angle that CRA is this projection lens.

8. projection lens as claimed in claim 5, is characterized in that, wherein this catoptron towards this at least the minute surface of a slice lens be concave mirror.

9. projection lens as claimed in claim 8, is characterized in that, wherein this catoptron towards this at least the minute surface of a slice lens be non-spherical surface.

10. projection lens as claimed in claim 5, wherein the lens numbers of this relay optical system is greater than the lens numbers of this projection optical system.