TWI680342B - Projector and its projection lens - Google Patents

Abstract

A projector and a projection lens. The projector includes an image light source generating device and a projection lens. The image light source generating device is configured to generate an image beam. The projection lens includes a relay optical system to receive the image beam. A projection optical system includes at least one lens and a reflecting member. When the relay optical system receives the image beam, the image beam passes through the at least one lens, is reflected by the reflecting member, and passes through the at least one again. Lens, and projected onto the imaging surface; wherein the ratio of the maximum mirror diameter of the reflector to the mirror diameter of the lens is one of the largest mirror diameters in the relay optical system, which satisfies the following conditions: 1.5 ≦ X ≦ 4 .

Description

Projector and its projection lens

The invention relates to an optical projection device; in particular, it relates to a projector and a projection lens for reducing the formation of ghost images.

With the advancement of video technology and the rapid development of optoelectronic technology, projection display devices such as projectors are becoming more and more popular. In addition to being used in conferences in the workplace, they can also be used in home theaters such as home entertainment The projection lens used to clearly present the image on the imaging surface is one of the core components.

In order to achieve clear projection in a small space, the projection lens of the projector is gradually designed toward the short-focus projection lens. However, in order to have a good projection effect at short distances, short-focus lenses are usually used in large numbers. And the larger lens achieves the effect of short focus and high optical power.

However, conventional projectors and projection lenses are not only bulky and heavy, and they cannot meet the requirements of miniaturization and light weight. In order to improve the above disadvantages, some researchers have developed a rear-projection projector, which uses a mirror to The image beam of the projector is reflected and projected onto the imaging surface to achieve the purpose of miniaturization and light weight. However, when a conventional rear-projection projector is used for projection, there are often multiple reflections between the lens groups to generate haloes and flare. For example, between the mirror and the lens, it is easy to generate multiple times between the lens and the lens. Reflections, so that on their projection screens, there are often defects such as overlapping shadows and ghosting shadows of varying positions and shapes. Depression not only hinders the beauty of the projection screen, but also destroys the composition of the projection screen, causing user distress.

Therefore, how to reduce or eliminate the occurrence of defects such as ghost images to provide a high-quality projection screen is one of the efforts of the inventors.

In view of this, an object of the present invention is to provide a projector and a projection lens thereof which can effectively improve the ghost problem.

In order to achieve the above object, a projector provided by the present invention includes: an image light source generating device for generating an image light beam; a projection lens for receiving the image light beam and projecting it to an imaging surface, the projection The lens includes a relay optical system and a projection optical system; the relay optical system is located between the image light source generating device and the projection optical system to receive the image light beam; the projection optical system includes a first lens and a A second lens having a first optical surface and a second optical surface opposite to each other, a reflective film is disposed on the first optical surface; the second lens is located on the first lens and the relay optics Between the systems, and the second lens has a third optical surface and a fourth optical surface opposite to each other, the fourth optical surface faces the relay optical system; wherein when the relay optical system receives the image After the light beam, the image light beam enters the second lens from the fourth optical surface, leaves the second lens from the third optical surface, and then enters the first optical surface from the second optical surface. Mirror, reflected by the reflective film, leaves the first lens from the second optical surface, enters the second lens from the third optical surface, and exits the second lens from the fourth optical surface, and then projects To the imaging surface.

In order to achieve the above object, the present invention further provides a projection lens for receiving an image beam and projecting the image beam onto an imaging surface, which includes: a relay optical system for receiving Receiving the image beam; a projection optical system including a first lens and a second lens, the first lens having a first optical surface and a second optical surface opposite to each other, and a first optical surface is provided with a A reflective film; the second lens is located between the first lens and the relay optical system, and the second lens has a third optical surface and a fourth optical surface opposite to each other, and the fourth optical surface faces The relay optical system; wherein, after the relay optical system receives the image beam, the image beam enters the second lens from the fourth optical surface and leaves the second lens from the third optical surface, The second optical surface is incident on the first lens and reflected by the reflective film, and then leaves the first lens from the second optical surface, and then enters the second lens from the third optical surface, and is then transmitted by the first optical surface. After the four optical surfaces leave the second lens, they are projected onto the imaging surface.

The effect of the present invention is that after the image light beam penetrates the second lens, it is incident from the second optical surface of the first lens, and is reflected again by the reflective film, and is emitted again from the second optical surface of the first lens, and again After passing through the second lens, it is projected onto the imaging surface. In this way, the image beam can be repeatedly passed through the projection optical system to achieve the optical design of the secondary optical effect, which can effectively reduce the size of the projector and the projection lens, and also has the ability of high-light school. In addition, the image beam does not penetrate the first optical surface of the first lens, but is reflected by a reflective film on the first optical surface, exits from the second optical surface of the first lens, and passes through the first optical surface again. Through the above design, the second lens can reduce the chance of unnecessary multiple reflections of the image beam between the lenses, thereby reducing the occurrence of ghost images and improving the quality of the projected picture.

100‧‧‧ Projector

10‧‧‧Image light source generating device

20‧‧‧ projection lens

22‧‧‧ Relay Optical System

24‧‧‧ Projection Optical System

A‧‧‧ Optical axis

B1, B1’‧‧‧first shade

B2‧‧‧Second shade

D‧‧‧distance

F‧‧‧ 稜鏡

G‧‧‧ lens

L1‧‧‧First lens

L2‧‧‧Second lens

L3‧‧‧ Third lens

L4 ~ L12‧‧‧ lens

P‧‧‧Image Beam

R1‧‧‧Reflector

R2‧‧‧Reflective film

ST‧‧‧ aperture

S1‧‧‧First optical surface

S2‧‧‧Second optical surface

S3‧‧‧ third optical surface

S4‧‧‧ Fourth optical surface

200, 300, 400, 500, 600, 700 ‧‧‧ projection lens

FIG. 1 is a structural diagram of a projector according to a first embodiment of the present invention.

FIG. 2 is a structural diagram of the projection lens of the above embodiment.

FIG. 3 is a partially enlarged view of FIG. 2, and it is disclosed in an embodiment that a first light shielding member is provided.

FIG. 4 is a partially enlarged view of FIG. 2, and it is disclosed in an embodiment that a second light shielding member is provided.

FIG. 5 is a structural diagram of a projection lens according to a second embodiment.

FIG. 6 is a structural diagram of a projection lens according to a third embodiment.

FIG. 7 is a structural diagram of a projection lens according to a fourth embodiment.

FIG. 8 is a structural diagram of a projection lens according to a fifth embodiment.

FIG. 9 is a structural diagram of a projection lens according to a sixth embodiment.

FIG. 10 is a structural diagram of a projection lens according to a seventh embodiment.

In order to explain the present invention more clearly, an embodiment is described in detail below with reference to the drawings. Please refer to FIG. 1 and FIG. 2, a projector 100 according to an embodiment of the present invention includes an image light source generating device 10 and a projection lens 20.

The image light source generating device 10 is used for reading image information of an image source, and has one piece of 稜鏡 F, and generates a corresponding image beam P passing through the 稜鏡 F according to the read image information. The projection lens 20 is used to receive the image beam P and project it to an imaging surface after optical processing with a predetermined effect. For example, the image beam P can be projected onto a projection screen to project the image on the projection screen (equivalent to imaging). Surface) to form a projection screen. In addition, in other practical implementations, depending on the application of different optical systems, the 稜鏡 F is not limited. For example, in an embodiment, the image light source generating device 10 may not be provided with a rib. Mirror, and generates an image beam P according to the read image information, and directly shoots the projection beam P, without being limited to the above description.

The projection lens 20 includes a relay optical system 22 and a projection optical system 24 arranged in order from a side near the image light source generating device 10 to a side far from the image light source generating device 10.

The relay optical system 22 is mainly composed of a plurality of lenses. For example, in this embodiment, the relay optical system 22 includes 10 lenses, including a third lens L3 and other lenses L4 to L12. Among them, the third lens L3 and lenses L3 ~ L5, L7, L10 ~ L12 are single-layer lenses, and lenses L6, L8, and L9 are compound lenses. The compound lenses can be cemented by two or more lenses, but this is not the case. In addition, in an embodiment, an aperture ST may be provided between the lens L7 and the lens L8. The relay optical system 22 is used to receive the image light beam P and conduct the image light beam P according to the designed optical effect. Astigmatism, field curvature, distortion and other aberrations, or adjustment of light path, such as optical design for focusing, zooming, etc., but not limited to this. In addition, in other applications, lens parameters and architectures such as the number of lenses and lens shape of the relay optical system 22 can also be adjusted or changed according to different optical design or characteristic requirements.

The projection optical system 24 includes at least one lens G and a reflector R1. In this embodiment, the at least one lens G includes a first lens L1 and a second lens L2. The first lens L1 has a first optical surface S1 and a second optical surface S2. The second lens L2 is located at Between the first lens L1 and the relay optical system 22, and the second lens L2 has a third optical surface S3 and a fourth optical surface S4 facing away from each other, and the fourth optical surface S4 faces the middle Following the optical system 22. In this embodiment, the first lens L1 and the second lens L2 are both meniscus lenses, the first optical surface S1 of the first lens L1 is convex, the second optical surface S2 is concave, and the first The third optical surface S3 of the two lenses L2 is a concave surface, the fourth optical surface S4 is a convex surface, and the third optical surface S3 faces the second optical surface S2. The reflector R1 In this embodiment, a reflector is disposed on one side of the first optical surface S1 of the first lens L1.

In this embodiment, the projection lens 100 satisfies the following conditions: 1.5 ≦ X ≦ 4, where X is one of the maximum lens diameter of the reflector R1 and the maximum lens diameter of the relay optical system 22 For example, in this embodiment, the maximum mirror diameter of the reflector R1 refers to the mirror diameter of the mirror, and its mirror diameter is 52 mm; the lens with the largest mirror diameter in the relay optical system 22 is The third lens L3 has a lens diameter of 27.8 mm, and its calculated X is about 1.87, which satisfies the foregoing conditions. Preferably, the projection lens 100 satisfies the following conditions: 1.8 ≦ X ≦ 3.5. Through the foregoing design, the projector 100 of the present invention can be implemented while effectively reducing the system length, size, and volume of the projection lens 20. The effect of large light angle can be used to design short-focus, miniaturized projection lenses and projectors.

In addition, preferably, the projection lens 100 also satisfies the following conditions: 0.5 ≦ Y ≦ 4, where Y is the largest lens diameter of the lens in the projection optical system 24 and the largest lens diameter in the relay optical system 22 The ratio of the lens diameter of the lens diameter. For example, in this embodiment, the lens with the largest lens diameter in the projection optical system 24 is the second lens L2, whose lens diameter is 53.4mm; the relay optical system 22 The lens with the largest mirror diameter is the third lens L3, whose mirror diameter is 27.8 mm, and its Y is calculated to be about 1.92, which satisfies the above conditions. Preferably, in an embodiment, the projection lens satisfies the following conditions: 1.0 ≦ Y ≦ 3.5. Through the above design, the projector 100 of the present invention can further effectively reduce the system length of the projection lens 20, In the case of size and volume, the effect of large light angle can be achieved, and short-focus, miniaturized projection lenses and projectors can be designed accordingly.

Therefore, please cooperate with FIG. 1 and FIG. 2, when the image light source generating device 10 generates an image beam P, when the image beam P enters the projection lens 20, it first passes through the relay optical system 22, Four optical surfaces S4 enter the second lens L2 and pass through the third optical surface. S3 leaves the second lens L2, enters the first lens L1 through the second optical surface S2, and reflects through the reflector R1, and then leaves the first lens L1 from the second optical surface S2 of the first lens L1. Then, the third optical surface S3 enters the second lens L2, and the fourth optical surface S4 leaves the second lens L2, and then is projected onto the imaging surface (not shown), for example, onto a projection screen, To form a projection screen.

Through the above design, the image beam P is repeatedly passed through the second lens L2 and the first lens L1 to achieve a secondary optical effect, and through the above-mentioned relay lens system 22 and projection lens system 24, the lens matching and parameter conditions The design of the projector and the projection lens of the present invention can effectively achieve a high optical efficiency design while reducing the size and volume of the lens, and can achieve the effects of short focus and miniaturization.

In addition, with the design of the projection lens of this embodiment, the image light beam P is incident into the projection optical system 24 from the lower half of the second lens L2, and then exits from the upper half of the second lens L2. The projection optical system 24 projects to the imaging surface. In this way, the optical path before the reflection by the reflector R1 and the optical path after the reflection by the reflector R1 intersect with each other, which can effectively avoid optical interference and improve the projection imaging quality.

In addition, please cooperate with FIG. 3. In one embodiment, based on the structure of any projection lens in this specification, a first light shielding member B1 is further provided on the at least one of the reflecting member R1 and the projection optical system 24. Between the lenses, for example, in this embodiment, the first light-shielding member B1 is disposed between the reflection member R1 and the first lens L1 to shield, block, or absorb the first light-shielding member B1. Preferably, the first light-shielding member B1 is made of an opaque material. The purpose of the first light-shielding member B1 is that when the image light beam is directed to the first light-shielding member B1, whether it is The image light beam emitted from the side of the first lens L1 toward the first light shielding member B1, or the image light beam reflected by the reflection member R1 and directed toward the first light shielding member B1 can be shielded by the first light shielding member B1. In addition, in addition to the first lens L1 and the reflector R1, In addition to a light-shielding member B1, in an embodiment, a first light-shielding member B1 may also be disposed between the first lens L1 and the second lens L2, so as to block unnecessary light, such as stray light.

In addition, in an embodiment, the first lens L1 is divided into a first half (also referred to as the upper half in the perspective of FIG. 3) and a second half (in the perspective of FIG. 3) according to the optical axis A. It can also be referred to as the lower half), in which the second half mainly passes the image light beam, in other words, most of the image light beam passes through the first lens L1 through the second half of the first lens L1, and The first light shielding member B1 is disposed between the first half portion and the reflection member R1. That is, preferably, the extension range of the first light-shielding member B1 is extended from the optical axis A to the edge of the reflector R1 and the first lens L1, or the first light-shielding member B1 is provided on the optical axis. One side of A may be disposed in a region above the optical axis A. In addition, in some embodiments, a shielding range of the first light shielding member B1 may be set according to requirements. It is also mentioned that, in some embodiments, the first light-shielding member B1 may extend to a portion below the optical axis A, but it is better that the portion of the first light-shielding member B1 above the optical axis A will be significantly more Below the optical axis A. Among them, the above-mentioned determination of the above-mentioned optical axis A and below is explained from the perspective of FIG. 3. In other applications, the above-mentioned and below may also be changed according to the way the projector is arranged.

Therefore, through the design of the first light-shielding member B1, stray light can be effectively eliminated, and defects such as ghosting can be prevented, thereby helping to improve optical imaging quality.

In addition, as shown in FIG. 4, in an embodiment, a second light shielding member B2 may be provided between the first lens L1 and the second lens L2. The material and characteristics of the second light shielding member B2 may be selected. It is substantially the same as the first light shielding member B1, and is not repeated here. In addition, preferably, the second light shielding member B2 is relatively close to the second lens L2 and relatively far from the first lens L1. Furthermore, more preferably, the second light-shielding member B2 is relatively close to the center of the second lens L2 and relatively far from the edge or outer diameter portion of the second lens L2.

Therefore, through the design of the second light-shielding member B2, stray light can be further effectively eliminated, and defects such as ghosting can be prevented, thereby helping to improve optical imaging quality.

≦4，其中，D為該投影光學系統與該中繼光學系統之間的距離，M為該中繼光學系統中最大鏡徑之透鏡的鏡徑，舉例而言，於一實施例當中，所述投影光學系統與中繼光學系統之間的距離D係指第二透鏡L2與第三透鏡L3於光軸A上的距離，而中繼光學系統當中最大鏡徑的透鏡係為透鏡L12，該距離D為50.5mm，透鏡L12的鏡徑為24mm，經計算其

=2.1，滿足前述條件。較佳者，所述投影鏡頭200係滿足以下條件，0.7≦

≦3.5。透過前述設計，本發明之投影機可以在有效地縮減投影鏡頭之系統長度、大小與體積的情況下，實現出光角度大之效果，並可據以設計出短焦、小型化的投影鏡頭與投影機。 Please refer to FIG. 5, which is a projection lens 200 according to a second embodiment of the present invention. The structure of the projection lens 200 is substantially the same as the projection lens 100 of the first embodiment. The reflector R1 has a mirror diameter of 53.14 mm. The largest lens diameter in the optical system is the lens L12. The lens diameter of the lens L12 is 24mm. After calculation, X = 2.21416. In addition to satisfying the condition of 1.5 ≦ X ≦ 4, in particular, the following conditions are more satisfied. : 0.5 ≦

≦ 4, where D is the distance between the projection optical system and the relay optical system, and M is the mirror diameter of the lens with the largest mirror diameter in the relay optical system. For example, in one embodiment, all The distance D between the projection optical system and the relay optical system refers to the distance between the second lens L2 and the third lens L3 on the optical axis A, and the lens with the largest lens diameter in the relay optical system is the lens L12. The distance D is 50.5mm, and the lens diameter of the lens L12 is 24mm.

= 2.1, meeting the aforementioned conditions. Preferably, the projection lens 200 meets the following conditions, 0.7 ≦

≦ 3.5. Through the aforementioned design, the projector of the present invention can effectively reduce the system length, size, and volume of the projection lens to achieve a large light angle, and can be used to design short-focus, miniaturized projection lenses and projections. machine.

Please refer to FIG. 6, which is a projection lens 300 according to a third embodiment of the present invention, and its structure is substantially the same as the projection lens of the foregoing embodiment. In particular, the reflecting member of the projection optical system of this embodiment is provided with The reflective film R2 on the first optical surface S1 of the first lens L1 is taken as an example. The reflective film R2 may be formed by plating a metal film such as silver or aluminum on the first optical surface S1 of the first lens L1. Structure, but not limited to this, in other applications, reflective films made of other materials can also be used. For example, a dielectric film can also be used to form the reflective film, such as a ceramic dielectric coating (Dielectric Coating), not limited to the above-mentioned metal film. Among them, in the projection lens 300 of the third embodiment, the maximum of the reflective film R2 The lens diameter is 96.8mm, the lens with the largest lens diameter in the relay optical system is the third lens L3, and the lens diameter is 50mm. After calculation, X = 1.936, which satisfies: 1.5 ≦ X ≦ 4; and 1.8 ≦ X ≦ 3, etc. condition. Through the foregoing design, the projector 100 of the present invention can effectively reduce the system length, size, and volume of the projection lens 20 to achieve the effect of a large light angle, and can be used to design short-focus, miniaturized projection lenses. With the projector.

It is also mentioned that the material of the first lens L1 is optional but not limited to plastic or glass. Preferably, in the third embodiment, the first lens L1 is made of glass material. High-temperature optical coating process can form a reflective film with many layers and good reflection efficiency.

Thereby, the image light beam P is not transmitted through the first optical surface S1 of the first lens L1, but is reflected by the reflective film 26 provided on the first optical surface S1, so that the The design that the image beam P leaves the first lens L1 again by the second optical surface S2 can reduce the quality loss of the image beam P and reduce the chance of the image beam P generating unnecessary and unnecessary reflections, thereby reducing or eliminating ghosts. Defects such as shadows and glare can help improve imaging quality.

It is added that in this embodiment, a first light-shielding member and / or a second light-shielding member may also be provided between the first lens L1 and the second lens L2 to shield unnecessary light such as stray light. .

≦4，其中，D為該投影光學系統與該中繼光學系統之間的距離，M為該中繼光學系統中最大鏡徑之透鏡的鏡徑，於本實施例中，D為第二透鏡L2與第三透鏡L3於光軸A上的距離，該距離D為27.34mm，而其中繼光學系統中最大鏡徑之透鏡 為第三透鏡L3，第三透鏡L3的鏡徑為31.6mm，經計算其

=0.865，滿足前述條件。透過前述設計，本發明之投影機可以在有效地縮減投影鏡頭之系統長度、大小與體積的情況下，實現出光角度大之效果，並可據以設計出短焦、小型化的投影鏡頭與投影機。 Please refer to FIG. 7, which is a projection lens 400 according to a fourth embodiment of the present invention. The structure of the projection lens 400 is substantially the same as the projection lens 100 of the first embodiment. The reflector R1 has a diameter of 49.64mm. The lens with the largest mirror diameter in the relay optical system is the third lens L3, whose mirror diameter is 31.6mm. After calculation, X = 1.5708, in addition to satisfying the condition of 1.5 ≦ X ≦ 4, in addition, it also meets the following Condition: 0.5 ≦

≦ 4, where D is the distance between the projection optical system and the relay optical system, and M is the mirror diameter of the lens with the largest mirror diameter in the relay optical system. In this embodiment, D is the second lens The distance between L2 and the third lens L3 on the optical axis A, the distance D is 27.34mm, and the lens with the largest mirror diameter in the relay optical system is the third lens L3, and the third lens L3 has a mirror diameter of 31.6mm. Calculate it

= 0.865, meeting the aforementioned conditions. Through the aforementioned design, the projector of the present invention can effectively reduce the system length, size, and volume of the projection lens to achieve a large light angle, and can be used to design short-focus, miniaturized projection lenses and projections. machine.

=1.4645，滿足0.5≦

≦4之條件。 In addition, please refer to FIG. 8, which is a projection lens 500 according to a fifth embodiment of the present invention. The structure of the projection lens 500 is substantially the same as the projection lens 100 of the first embodiment. The reflector R1 has a diameter of 54.28 mm. The lens with the largest lens diameter in the following optical system is the lens L12, the lens diameter of the lens L12 is 25.14 mm, the lens with the largest lens diameter in the projection optical system is the second lens L2, and the lens diameter of the second lens L2 is 53.5mm, the distance between the projection optical system and the relay optical system is D, the distance D is 36.82mm, after calculation, X = 2.1591, which meets the condition of 1.5 ≦ X ≦ 4; Y = 2.1280, which meets 0.5 ≦ Y Condition ≦ 4;

= 1.4645, satisfy 0.5 ≦

The condition of ≦ 4.

=1.658，滿足0.5≦

≦4之條件。 Please refer to FIG. 9, which is a projection lens 600 according to a sixth embodiment of the present invention. The structure of the projection lens 600 is substantially the same as the projection lens 100 of the first embodiment. The reflector R1 has a mirror diameter of 54.66 mm. The lens with the largest lens diameter in the optical system is the lens L12. The lens diameter of the lens L12 is 25 mm. The lens with the largest lens diameter in the projection optical system is the second lens L2. The lens diameter of the second lens L2 is 64 mm. The distance between the projection optical system and the relay optical system is D, and the distance D is 41.45mm. After calculation, X = 2.1864, which satisfies the condition of 1.5 ≦ X ≦ 4; Y = 2.56, which satisfies the condition of 0.5 ≦ Y ≦ 4 ;

= 1.658, satisfy 0.5 ≦

The condition of ≦ 4.

=0.7282，滿足0.5≦

≦4之條件。 Please refer to FIG. 10, which shows a projection lens 700 according to a seventh embodiment of the present invention. The structure of the projection lens 700 is substantially the same as that of the projection lens 100 according to the first embodiment. The lens system with the largest lens diameter in the relay optical system is the first lens. Three lenses L3. The lens diameter of the third lens L3 is 36.8mm. The lens with the largest lens diameter in the projection optical system is the second lens L2. The lens diameter of the second lens L2 is 52mm. The projection optical system and relay The distance between the optical systems is D, and the distance D is 26.8mm. After calculation, Y = 1.4130, which satisfies the condition of 0.5 ≦ Y ≦ 4;

= 0.7282, satisfy 0.5 ≦

The condition of ≦ 4.

It is worth mentioning that in other applications, the projection optical system of the above embodiments does not exclude that one or more other lenses are additionally provided between the first lens L1 and the second lens L2, and the above description is not used as limit. However, preferably, in the foregoing embodiment, the projection optical system 24 is only provided with the first lens L1 and the second lens L2. In this way, in addition to reducing the number of lenses of the projection optical system, In addition to cost, based on the reduction in the number of lenses, the chance of unnecessary light reflections between lenses can be reduced, which can reduce the chance of ghosting and improve imaging quality. In addition, in an embodiment, the projection optical system may also be provided with a single lens, and is not limited to the above embodiment having the first lens L1 and the second lens L2.

It is added that through the above parameter design, the present invention can effectively shorten the total system length to design a short-focus, miniaturized projector and projection lens. The lenses are all on the same optical axis, so even if the lens closest to the projection optical system (such as the third lens) in the relay optical system needs to be trimmed, it can still easily find its optical axis, which can effectively Improve measurement accuracy and production yield in production.

The above is only the preferred and feasible embodiment of the present invention. In this embodiment, the optical architecture of the projector and the projection lens adopts a telecentric system design, but in other applications, this is not the case. However, in one embodiment, a non-telecentric system design can also be adopted. Example of applying the present invention The equivalent changes in the description and the scope of patent application should be included in the patent scope of the present invention.

Claims (11)

A projection lens for receiving an image beam and projecting it to an imaging surface includes: a relay optical system including a plurality of lenses for receiving the image beam; a projection optical system including at least one lens and A reflecting member, the at least one lens has a first optical surface and a second optical surface opposite to each other, the first optical surface faces the reflecting member, and the second optical surface faces the relay optical system; When the relay optical system receives the image beam, the image beam passes through the second optical surface and is reflected by the reflector, then leaves the at least one lens from the second optical surface, and is projected onto the imaging surface; The ratio of the maximum mirror diameter of the reflector to the mirror diameter of the lens, which is one of the largest mirror diameters in the relay optical system, is X, which satisfies the following condition: 1.5708 ≦ X ≦ 4. The projection lens according to claim 1, wherein the at least one lens includes a first lens and a second lens, the first lens has the first optical surface and the second optical surface, and the second lens has opposite sides A third optical surface and a fourth optical surface; the image beam enters the second lens from the fourth optical surface, leaves the second lens from the third optical surface, and then passes through the second optical surface After entering the first lens and reflecting through the reflecting member, it leaves the first lens from the second optical surface, enters the second lens from the third optical surface, and leaves the first lens from the fourth optical surface. After two lenses, it is projected onto the imaging surface. The projection lens according to claim 2, wherein the reflective member is a reflective film disposed on the first optical surface of the first lens. The projection lens according to claim 1, wherein the ratio of the lens diameter of the lens with the largest lens diameter in the projection optical system to the lens diameter of the lens with the largest lens diameter in the relay optical system is Y, which satisfies the following conditions: 0.5 ≦ Y ≦ 4. The projection lens according to claim 1, wherein the distance between the projection optical system and the relay optical system is D, and the lens diameter of the lens with the largest mirror diameter in the relay optical system is M, which satisfies the following conditions: 0.5 ≦ ≦ 4. The projection lens according to claim 1 includes a first light shielding member located between the reflection member and the at least one lens of the projection optical system. A projection lens for receiving an image beam and projecting it to an imaging surface includes: a relay optical system including a plurality of lenses for receiving the image beam; a projection optical system including at least one lens and A reflecting member, the at least one lens has a first optical surface and a second optical surface opposite to each other, the first optical surface faces the reflecting member, and the second optical surface faces the relay optical system; When the relay optical system receives the image beam, the image beam passes through the second optical surface and is reflected by the reflector, then leaves the at least one lens from the second optical surface, and is projected onto the imaging surface; The ratio of the maximum mirror diameter of the reflector to the mirror diameter of the lens, which is one of the largest mirror diameters in the relay optical system, is X, which satisfies the following conditions: 1.5 ≦ X ≦ 4; and further includes a first light shielding member located in the Between the reflector and the at least one lens of the projection optical system; wherein the at least one lens of the projection optical system is divided into a first half and a second half according to the optical axis, and the first half and the reflection With a light blocking member disposed between the first member, the second half of the main image beam through the supply. A projection lens for receiving an image beam and projecting it to an imaging surface includes: a relay optical system including a plurality of lenses for receiving the image beam; a projection optical system including at least one lens and A reflecting member, the at least one lens has a first optical surface and a second optical surface opposite to each other, the first optical surface faces the reflecting member, and the second optical surface faces the relay optical system; When the relay optical system receives the image beam, the image beam passes through the second optical surface and is reflected by the reflector, then leaves the at least one lens from the second optical surface, and is projected onto the imaging surface; The ratio of the maximum mirror diameter of the reflector to one of the largest mirror diameters in the relay optical system is X, which satisfies the following conditions: 1.5 ≦ X ≦ 4; wherein the at least one lens includes a first A lens and a second lens, the first lens having the first optical surface and the second optical surface, the second lens having a third optical surface and a fourth optical surface opposite to each other; the image beam system from A fourth optical surface is incident on the second lens, and the third optical surface is separated from the second lens. The second optical surface is incident on the first lens, and is reflected by the reflecting member. The first lens leaves the first lens, and then enters the second lens through the third optical lens, and then leaves the second lens from the fourth optical lens, and then projects onto the imaging surface; Between a lens and the second lens. A projection lens for receiving an image beam and projecting it to an imaging surface includes: a relay optical system including a plurality of lenses for receiving the image beam; a projection optical system including at least one lens and A reflecting member, the at least one lens has a first optical surface and a second optical surface opposite to each other, the first optical surface faces the reflecting member, and the second optical surface faces the relay optical system; When the relay optical system receives the image beam, the image beam passes through the second optical surface and is reflected by the reflector, then leaves the at least one lens from the second optical surface, and is projected onto the imaging surface; The ratio of the maximum mirror diameter of the reflector to one of the largest mirror diameters in the relay optical system is X, which satisfies the following conditions: 1.5 ≦ X ≦ 4; wherein the at least one lens includes a first A lens and a second lens, the first lens having the first optical surface and the second optical surface, the second lens having a third optical surface and a fourth optical surface opposite to each other; the image beam system from A fourth optical surface is incident on the second lens, and the third optical surface is separated from the second lens. The second optical surface is incident on the first lens, and is reflected by the reflecting member. The first lens leaves the first lens, and then enters the second lens through the third optical lens, and then leaves the second lens from the fourth optical lens, and projects to the imaging surface; Between a lens and the second lens, the second light shielding member is relatively close to the second lens and relatively far from the first lens. The projection lens according to claim 9, wherein the second light shielding member is relatively close to a center of the second lens and relatively far from an outer periphery of the second lens. A projector includes: an image light source generating device for generating an image light beam; and a projection lens according to any one of claims 1 to 10.