TW201835672A - Optical System - Google Patents

Abstract

The present invention discloses an optical system comprising, in sequence along light path, a first light source, a first wavelength conversion element, and a first light valve. The optical system further includes a second light source and a second light valve. The first light source emits illumination light, and the first wavelength conversion element is a fluorescent wheel. The fluorescent wheel receives the illumination light and outputs another illumination light; the first light valve is a digital micro-mirror device that converts the illumination light into image light. And the second light source may emit two different colors of illumination light, and the second light valve may emit two corresponding image light; and the image light may be combined by, for example, a dichroic mirror, and outputted via an optical lens output, for color projection. The number of light valves of the optical system of the present invention is two.

Description

Optical system

The present invention relates to an optical system, and more particularly to an optical system with a double light valve.

The development of science and technology promotes the progress of the times, and due to the large changes in consumer demand, projectors on the market are constantly being updated. In digital projectors, light valves are often used to convert illumination light into image light. Digital projector products generally use different light valve structures as a way to distinguish projectors. According to the type of light valve, the main technologies can be divided into three types: LCD, DLP and LCOS. In response to the increase in consumer demand for brightness, some manufacturers have started to use multiple light valve structures to simultaneously provide images with multiple wavelengths to increase the overall brightness of the optical system.

However, when higher brightness is required, the existing common multi-light valve projectors often increase the number of light sources, but in this situation, it will enlarge the optical angularity (Etendue), resulting in loss of light reception and only Time-domain brightness adjustment. Or, using more than three groups of light valves and light source groups, the overall architecture is to adjust the brightness in space, but the architecture of the three groups of light valves is a major challenge in design and production.

An embodiment of the present invention provides an optical system including a first light source, a first spatial light modulator, and a first light valve in order according to a traveling path of the light; in addition, the optical system also includes in order A second light source and a second spatial light modulator. The first light source emits blue illumination light, the first wavelength conversion element is a fluorescent wheel, and the fluorescent wheel is provided with a fluorescent powder layer. The phosphor layer receives the blue illumination light and outputs a green illumination light, and the green illumination light then enters the first spatial light modulator. The first spatial light modulator is a digital micro-mirror element that converts green illumination light into green image light. The second light source may emit, for example, blue light or red light and enter the second light valve to generate image light of a corresponding color; and each image light may be combined by a light combining element such as a dichroic mirror and then combined by optical Lens output for color projection. For example, the number of light valves in the optical system is two.

Compared with the single light valve structure, the invention can effectively improve the overall brightness. Compared with the three-light valve architecture, the present invention has less difficulty in design and production, and the brightness can achieve the effect close to that of the three-light valve architecture. In addition, in order to make the above features and advantages of the present invention more comprehensible, embodiments are described below in detail with reference to the accompanying drawings.

The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of various embodiments with reference to the drawings. The directional terms mentioned in the following embodiments, such as "up", "down", "front", "rear", "left", "right", etc., are only directions referring to the attached drawings. Therefore, the directional terms used are used for illustration, not for limiting the present invention. In addition, the terms "first" and "second" used in the following examples are used to identify the same or similar elements, and are not intended to limit the elements. In addition, the following embodiments are only further described for the optical system. Those skilled in the art can apply this connection system to any required situation according to actual needs.

The so-called optical element in the present invention means that the element is composed of a part or all of a material that can be reflected or penetrated, and usually includes glass or plastic. The so-called light combining in the present invention means that more than one light beam can be combined into one light beam and output.

FIG. 1 is a schematic diagram illustrating an optical system according to a first embodiment of the present invention. Please refer to FIG. 1, the optical system 11 includes a first imaging module 10, a second imaging module 20 and a projection lens 30.

The design of the first imaging module 10 is described below. Generally speaking, the first imaging module 10 may include a light source and a first spatial light modulator in the most simplified form. The light source provides illumination light, and the illumination light enters the first spatial light modulator, and the first spatial light modulator The transformer converts the illumination light into the image light. Please refer to FIG. 1. In this example, it can be seen from the figure that the first imaging module 10 includes a first light source 101, a first beam splitter 103, a first lens group 104, and a first wavelength in the order of the light path. The conversion element 105, the first light uniformity element 109, the first chirp 110, and the first spatial light modulator 111 (or, a light valve).

Generally, the first light source 101 is used to generate a first illumination light IL1. In this example, the first light source 101 is a blue laser chip array, and a microlens is disposed above each laser chip to adjust the light type of the light emitted by each laser chip. There is a peak wavelength in the spectrum of the first illumination light IL1. The peak wavelength is between 430 and 470 nm, which is essentially blue light.

The first beam splitter 103 of the present invention refers to a bandpass filter, a bandstop filter, a DM filter, a dichroic mirror, and a dichroic filter. DM prism, X plate, X Plate, X Prism, transflective mirror, mirror, lens, plate glass , Polarization beam splitter (BS) and other components, or including at least one of the foregoing and combinations thereof. Taking a dichroic filter as an example, it is a flat glass coated with a dichroic coating, which can reflect or transmit light of a specified wavelength. In this example, the first beam splitter 103 is a dichroic filter that allows blue light to pass through and green light to reflect.

In addition, in general, the first lens group 104 is used to control the light path of the light. The first lens group 104 includes at least one lens, preferably at least two lenses. Generally, the optical quality of the light after passing through it will vary with the lens. Quantity. In this example, the first lens group 104 is composed of two lenses, and the refractive power of the first lens group 104 is positive.

Furthermore, in general, the first wavelength conversion element 105 can convert the first illumination light IL1 of the first light source 101 into a different wavelength or can be used to adjust the spectrum of the incident light. The so-called first wavelength conversion element 105 in the present invention is a bandpass filter, a bandstop filter, a DM filter, a dichroic mirror, DM prism, X plate, X plate, X Prism, transmissive / reflective color wheel, transmissive / reflective fluorescent wheel, transmissive / A reflective phosphor plate or other optical element coated with a phosphor or a filter material. In this example, the first wavelength conversion element 105 is a monochrome reflective fluorescent wheel. More specifically, the fluorescent wheel train includes a motor and a substrate connected to the motor. The axis of the motor is connected to the center of the circular substrate and is linked. The motor rotates the axis and drives the substrate to rotate. The substrate has a circular reflective area. A reflective material layer (or, a fluorescent powder layer) and a reflective layer are provided in the reflective area. The substrate passes the reflective layer and the fluorescent material-containing material layer. connection. The layer of phosphor-containing material can accept a short-wavelength light and output a long-wavelength light. In other words, the material layer containing fluorescent powder has a mixture of fluorescent powder and colloid that is at least partially transparent. The reflective layer includes a reflective film, such as a silver film or an aluminum film, for reflecting light. More specifically, in this example, the material layer containing the fluorescent powder on the surface of the first wavelength conversion element 105 can be excited by blue light and output green light, but the material layer containing the fluorescent powder is not completely opaque, so it will Part of the blue light penetrates the material layer containing the fluorescent powder, and the blue light is reflected by the reflective layer behind the material layer containing the fluorescent powder and re-enters the material layer containing the fluorescent powder to increase the excitation efficiency.

In addition, generally, the first light homogenizing element 109 is used to homogenize light. The first light homogenizing element 109 of the present invention is an integrating column, a fly-eye lens, a light homogenizing sheet, or other optical elements having a light homogenizing effect. In this example, the first light homogenizing element 109 is a fly-eye lens.

Furthermore, the first chirp 110 in the present invention is a chirp group such as a TIR prism, a reverse total reflection (RTIR prism), or a polarizer prism (Polarizer Prism). In this example, the first chirp 110 is a reverse total reflection chirp (RTIR prism). In this example, the total internal reflection chirp consists of a triangular cylinder. In addition, when a plurality of cymbals in the first cymbal 110 cooperate with each other, a gap may be selectively included between them, and the gap is less than 1 mm, or less than 0.01 mm. However, the first chirp 110 does not have to be composed of multiple chirps. For example, if the first chirp 110 is a reverse total reflection chirp (RTIR prism), it may include only a single chirp. In addition, the first ridge 110 must also be formed by combining a plurality of cooperating polygonal cylinders or cones (including triangles).

The spatial light modulator referred to in the present invention includes a plurality of independent units, which are spatially arranged in a one-dimensional or two-dimensional array. Each unit can be independently controlled by optical or electrical signals, using various physical effects (Pockels effect, Kerr effect, acousto-optic effect, magneto-optic effect, semiconductor self-optical effect, photorefractive effect, etc.) to change itself The optical characteristics of the light are modulated to illuminate the illumination light in the plurality of independent units and output image light. In this example, the first spatial light modulator 111 in the first imaging module 10 is a digital micro-mirror element (DMD), and the so-called independent unit in the first spatial light modulator 111 refers to its Each micro-mirror on the surface can rotate independently and reflect the incident light at a specific angle.

The design of the second imaging module 20 is described below. Generally speaking, the second imaging module 20 may include a light source and a spatial light modulator in the simplest form. The light source provides illumination light, and the illumination light enters the spatial light modulator. The spatial light modulator converts the illumination light. Converted into image light. In addition, it can be seen from FIG. 1 that the second imaging module 20 includes a second light source 201, a reflector 202, a second beam splitter 203, a second lens group 204, and a second wavelength conversion element in the order of the light path. 205, two reflecting mirrors 206, 207, a third dichroic mirror 208, a second light homogenizing element 209, a second chirp 210, and a second spatial light modulator 211.

Generally, the second light source 201 can generate a second illumination light IL2 according to requirements. The peak wavelength of the second illumination light IL2 is between 430 and 470 nm, which is essentially blue light. In this example, the second light source 201 is a two-blue laser chip array, and a microlens element is disposed above each laser chip to adjust the light type of the light emitted by each laser chip.

Furthermore, the second dichroic mirror 203 and the third dichroic mirror 208 can be used to separate or combine light, respectively. More specifically, the second dichroic mirror 203 and the third dichroic mirror 208 of the present invention refer to bandpass filters, bandstop filters, and DM filters. ), Dichroic mirror, DM prism, X plate, X plate, X Prism, transflective, total reflection Elements such as a mirror, a lens, a plate glass, a polarization beam splitter (BS), or at least one or a combination of the foregoing. In this example, the second dichroic mirror 203 and the third dichroic mirror 208 are dichroic filters, respectively. The second beam splitter 203 allows blue light to pass through and red light is reflected. The third dichroic mirror 208 allows red light to penetrate and blue light to reflect.

In addition, the description of the second lens group 204 corresponds to the description of the first lens group 104, so it will not be described repeatedly.

The second wavelength conversion element 205 is used to convert the wavelength of incident light. The second wavelength conversion element of the present invention is a bandpass filter, a bandstop filter, a DM filter, a dichroic mirror, and a dichroic edge. DM prism, X plate, X plate, X Prism, transmissive / reflective color wheel, transmissive / reflective fluorescent wheel, transmissive / reflective A phosphor plate or other optical element coated with phosphor. In this example, the second wavelength conversion element is a half transflective transflective fluorescent wheel. More specifically, in this example, the fluorescent wheel includes a motor and a substrate connected to the motor. The axis of the motor is connected to the center of the circular substrate and is linked. The motor rotates the axis and drives the substrate to rotate. The substrate is provided with a reflection region 205A and a penetration region 205B, and the reflection region 205A and the penetration region 205B are combined into a substantially annular shape. The surface of the reflection area 205A is provided with a material layer (or, a fluorescent powder layer) and a reflective layer. The substrate is connected to the material layer through the reflective layer. The material layer includes fluorescent powder, which can accept a short-wavelength light and Output a long wavelength light. Generally, the material layer includes a mixture of fluorescent powder and colloid that is at least partially transparent. The reflective layer includes a reflective film, such as a silver film or an aluminum film, for reflecting light. In the transmissive region 205B, the substrate is at least partially transparent, allowing light of a specific wavelength or characteristic to pass through. In this example, the material layer on the surface of the reflective region 205A can receive blue light and be excited to output red light, and the reflective layer is a silver film. On the other hand, the substrate of the penetrating region 205B is transparent and can allow light of any wavelength to pass through. The reflection area 205A and the penetration area 205B account for about 60% and 40% of the circumference of the circular substrate.

Furthermore, the description of the second light homogenizing element 209, the second chirp 210, and the second spatial light modulator 211 (or, the light valve) is the same as that of the first light homogeneous element 109, the first chirp 110, and the first spatial light. The design of the modulator 111 is corresponding, so it will not be described in detail.

The design of the projection lens 30 will be described below. Generally, the projection lens 30 refers to a device including at least one lens. Generally speaking, the projection lens 30 may be provided with an aperture stop (STOP), and one or more lenses may be respectively provided before and after the aperture stop. The lens preferably refers to an optical element having at least one curved surface. In this example, the projection lens 30 includes a first lens group 31, a second lens group 32, a third lens group 33, and a combining optical element 34. In addition, an aperture light bar (not shown) is also provided.

Please refer to FIG. 1. As can be seen from the figure, in this example, the projection lens 30 includes a first lens group 31, a second lens group 32 and a third lens group 33. The first lens group 31, the second lens group 32, and the third lens group 33 each include at least one lens, preferably at least two lenses, and generally the optical quality will improve with the number of lenses. In this example, the first lens group 31 is composed of four lenses, and the refractive power of the first lens group 31 is positive. The second lens group 32 is composed of four lenses, and the refractive power of the second lens group 32 is positive. The third lens group 33 is composed of four lenses, and the refractive power of the third lens group 33 is negative. Incidentally, the third lens group 33 may be optionally provided with a flat plate or a reflector having a curvature.

The light-combining optical element 34 is made of a part or all of a material that can reflect or penetrate, and usually comprises glass or plastic, and it can combine more than one light beam into one light beam to output. In this example, the light combining optical element 34 is a dichroic filter. The light combining optical element 34 is configured to combine the light emitted from the first lens group 31 and the second lens group 32 and combine the lights to output the combined image light to the third lens group. The combined optical element 34 only receives image light from the first spatial light modulator and the second spatial light modulator. In other words, the previous sentence can also be understood as the images passed by the combined light optical element 34 The light is limited from the first spatial light modulator 111 and the second spatial light modulator 211, and does not receive the image light (if any) output from other spatial light modulators, such as collective light and the like. , Not for him.

The first lens group 31, the second lens group 32, and the third lens group 33 are provided on three sides of the light combining optical element 34. That is, the light combining optical element 34 is disposed between the first lens group 31, the second lens group 32, and the third lens group 33 and is inclined at 45 degrees, respectively. The aperture light barrier (not shown) may be disposed between the first lens group 31, the second lens group 32 and the third lens group 33. From another perspective, the light combining optical element 34 includes a first light incident surface 341, a second light incident surface 342, and a first light emitting surface 343. The first lens group 31 and the second lens group 32 are disposed in the light The light incident path of the optical element 34 corresponds to the first light incident surface 341 and the second light incident surface 342, respectively, and the third lens group 33 is disposed on the light path of the light combining optical element 34 and is in line with the first The light emitting surface 343 corresponds to the second light incident surface 342 and the first light emitting surface 343 in this example.

The arrangement of the first imaging module 10, the second imaging module 20, and the projection lens 30 will be described below. As can be seen from FIG. 1, the first imaging module 10 is disposed at the corresponding position of the first lens group 104 of the projection lens 30; and the second imaging module 20 is disposed at the corresponding position of the projection lens 30. In addition, the angles at which the image light of the first imaging module 10 and the second imaging module 20 enter the projection lens 30 are substantially perpendicular to each other. More specifically, the position of the first lens group 31 in the projection lens 30 corresponds to the first frame 210, and the position of the second lens group 32 corresponds to the second frame 310. In this example, the first The number of prism groups between the spatial light modulator 111 and the first prism 210 is one. The number of prism groups between the second spatial light modulator 211 and the second chirp 210 is also the same.

In the following, the way of travel of light in the optical system 1 of this example will be exemplified. More specifically, in this example, the first light source 101 of the first imaging module 10 emits the first illumination light IL1, and the first illumination light IL1 is blue light. More specifically, in the spectrum of the first illumination light IL1, A Peak Wavelength is between 430nm and 470nm. The first illumination light IL1 passes through the first beam splitter 103 and the first lens group 104 and reaches the first wavelength conversion element 105. That is, the first lens group 104 is disposed between the first beam splitter 103 and the first wavelength conversion element 105. The first wavelength conversion element 105 is a fluorescent wheel. The ring-shaped fluorescent powder layer on the surface of the fluorescent wheel is excited by the blue light of the first light and emits the third illumination light IL3. The third illumination light IL3 line is green light. That is, a peak wavelength (Peak Wavelength) in the spectrum of the third illumination light IL3 falls between 490 nm and 560 nm. The third illumination light IL3 is reflected by the first beam splitter 103 and enters the first frame 110 after passing through the first light uniforming element 109. The third illumination light IL3 penetrates the first ridge 110 and enters the first spatial light modulator 111, and the first spatial light modulator 111 converts the third illumination light IL3 into the first image light IM1 and outputs the same. . The first image light IM1 is reflected by the first frame 110 and leaves the first frame 110 and outputs the first imaging module 10.

On the other hand, in this example, the second light source 201 of the second imaging module 20 emits blue second illumination light IL2. More specifically, a peak wavelength (Peak) in the spectrum of the second illumination light IL2 (Peak Wavelength) falls between 430nm and 470nm. The second illumination light IL2 is reflected by the reflector and reaches the second beam splitter 203. The second illumination light IL2 penetrates the second beam splitter 203 and the second lens group 204 and reaches the second wavelength conversion element 205. That is, the second lens group 204 is disposed between the second beam splitter 203 and the second wavelength conversion element 205. The second wavelength conversion element 205 is a half-transparent fluorescent wheel. When the penetrating region 205B on the surface of the phosphor wheel is illuminated by the second illumination light IL2, the second illumination light IL2 passes through the penetrating region 205B and passes through two The reflecting mirrors 206 and 207 are reflected to the third beam splitter 208, that is, the third beam splitter 208 is disposed between the light paths of the first spatial light modulator 211, the second beam splitter 203, and the mirror 207. The third beam splitter 208 reflects the second illumination light IL2 and makes the second illumination light IL2 penetrate the second light uniforming element 209 and the second chirp 210 to enter the second spatial light modulator 211, and the second spatial light modulator The transformer 211 converts the second illumination light IL2 into a second image light IM2 and outputs the same. The second image light IM2 is reflected by the second chirp 210 and leaves the second chirp 210 and outputs the second imaging module 20. When the phosphor layer on the part 205A of the reflection area on the surface of the fluorescent wheel is excited by the blue light of the second illumination light IL2, the fourth illumination light IL4 is emitted, and the fourth illumination light IL4 line is red light. More specifically, the first A peak wavelength (Peak Wavelength) in the spectrum of the four illumination lights IL4 falls between 625nm and 740nm. The fourth illumination light IL4 travels to the second beam splitter 203 and is reflected by the second beam splitter 203 to reach the third beam splitter 208. The fourth illumination light IL4 will penetrate the third beam splitter 208, the second light homogenizing element 209, and the second chirp 210 to enter the second spatial light modulator 211, and the second spatial light modulator 211 will The illumination light IL4 is converted into a fourth image light IM4 and output. The fourth image light IM4 is reflected by the second frame 210 and leaves the second frame 210 to output the second imaging module 20.

It can be known from the foregoing description that, in this example, because the green light is excited by the monochromatic fluorescent wheel, the first spatial light modulator 111 can continuously receive the green third illumination light IL3, that is, the first The light source 101 can be continuously turned on. To put it another way, it can be said that for a specified length of time (for example, within one second), the time that the spatial light modulator receives the illumination light is close to 100% of the specified time length or slightly greater than 99%. In other words, if the time for playing a single frame is a specified time length, for example, about 1 / 60S, the time length when the first spatial light modulator 111 receives the first illumination light IL1 beam is 60 times the specified time length. % Or 80% or even 100%. Conversely, the red light and blue light are output by the transflective fluorescent wheel, so the time when the second spatial light modulator 211 can receive the second illumination light IL2 or the fourth illumination light IL4 will not reach the specified length of time, respectively. 100%. In this example, the ratio of the red light and blue light illumination light reaching the second spatial light modulator 211 is the same as the ratio of the reflection region 205A and the transmission region 205B of the second wavelength conversion element 205, which is about 6 to 4, That is about 60% and 40%.

On the other hand, in this example, the green-colored first image light IM1 passes through the first lens group 31 and reaches the light-combining optical element 34 after outputting the first imaging module 10. The blue and red second image light IM2 and fourth image light IM4 will reach the first lens group 31 after outputting the first imaging module 10, and the second image light IM2 and fourth image light IM4 will pass through the first lens group 31, respectively. The two lens groups 32 reach the light combining optical element 34. The first image light IM1 is reflected by the light combining optical element 34, and the second image light IM2 and the fourth image light IM4 are reflected by the light combining optical element 34. The first image light IM1, the second image light IM2, and the fourth image light IM4. Will be combined into a third image light IM3. The third image light IM3 then penetrates the third lens group 33 and outputs the projection lens 30. Thereby, the projection lens 30 can output image light of at least three colors.

Moreover, please refer to FIG. 2, which is a schematic diagram illustrating a second embodiment of the optical system 1. It can be seen from the figure that the main difference from the first embodiment lies in the design of the second imaging module 20. More specifically, in this example, the second embodiment has a second light source 201 and a third light source 212, and the second light source 201 and the third light source 212 can emit red and blue second illumination lights IL2 and Fourth illumination light IL4. In this example, the second light source 201 and the third light source 212 include a plurality of red and blue light emitting diode modules or laser light emitting modules, respectively. A second beam splitter 203 is provided between the second light source 201 and the third light source to allow the second illumination light IL2 and the fourth illumination light IL4 emitted by the second light source 201 and the third light source 212 to pass through, respectively. And is reflected and travels to the second spatial light modulator 211. Considering the travel paths of the second illumination light IL2 and the fourth illumination light IL4 behind the second beam splitter 203, the first embodiment is substantially the same, and will not be described in detail here. In addition, compared with the first wavelength conversion element of the first embodiment, this example is a fluorescent optical element 106. The so-called fluorescent optical element 106 in the present invention refers to an element provided with a phosphor layer and partially or fully reflective or transmissive material, and generally includes glass or plastic. The fluorescent optical element 106 is disposed on the optical path of the first illumination light, and can receive the first illumination light and output a third illumination light. The third illumination light is a green illumination light.

Moreover, please refer to FIG. 3, which is a schematic diagram illustrating a third embodiment of the optical system 1. As can be seen from the figure, the main differences from the second embodiment are as follows. In this example, the first light source 101 of the third embodiment can emit green light. More specifically, the first light source 101 includes a plurality of green light emitting diode modules or laser light emitting modules, respectively. The light source emitted by the first light source 101 can enter the first light valve 113 through the first light uniforming element 109 and the first chirp 110 to be converted into image light. After the light source is output, it is not converted by the phosphor. Correspondingly, the second light source 102 also enters the second light valve 213 correspondingly to be converted into image light. In addition, the present invention is replaced with a light combining element 35 with respect to the light combining optical element 34 of the second embodiment. The so-called light combining element 35 in the present invention refers to a bandpass filter, a bandstop filter, a DM filter, a dichroic mirror, DM prism, X Plate, X Plate, X Prism, or a combination of at least one of the foregoing, or semi-transparent, Any one of a group consisting of a mirror, a lens, a plate glass, and a polarization beam splitter (BS). In this example, the light combining element 35 is a dichroic filter.

Compared with the single light valve structure, the invention can effectively improve the overall brightness. Compared with the three-light valve architecture, the present invention has less difficulty in design and production, and the brightness can achieve the effect close to that of the three-light valve architecture. Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

1‧‧‧ optical system

10‧‧‧The first imaging module

101‧‧‧first light source

103‧‧‧First Beamsplitter

104‧‧‧The first lens group

105‧‧‧first wavelength conversion element

106‧‧‧Fluorescent Optical Elements

109‧‧‧The first uniform light element

110‧‧‧First

111‧‧‧The first spatial light modulator

113‧‧‧The first light valve

20‧‧‧Second imaging module

201‧‧‧second light source

202‧‧‧Mirror

203‧‧‧Second Beamsplitter

204‧‧‧Second lens group

205‧‧‧Second wavelength conversion element

205A‧‧‧Reflected area

205B‧‧‧ Penetration zone

206‧‧‧Reflector

207‧‧‧Mirror

208‧‧‧Third dichroic mirror

209‧‧‧Second uniform light element

210‧‧‧Secondary

211‧‧‧Second spatial light modulator

212‧‧‧third light source

213‧‧‧Second light valve

30‧‧‧ projection lens

31‧‧‧first lens group

32‧‧‧Second lens group

33‧‧‧ Third lens group

34‧‧‧Combined Optical Elements

35‧‧‧Combined light element

342‧‧‧Second light entrance

343‧‧‧First light surface

IL1‧‧‧First illumination light

IL2‧‧‧Second Illumination Light

IL3‧‧‧Third illumination light

IL4‧‧‧Fourth illumination light

IM1‧‧‧First image light

IM2‧‧‧Second image light

IM3‧‧‧Third image light

FIG. 1 is a schematic diagram of an optical system according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of an optical system according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram of an optical system according to a third embodiment of the present invention.

Claims (10)

An optical system includes: a first light source that generates a first illuminating light; a spectrum of the first illuminating light has a peak wavelength between 430 and 470 nm; a second light source that generates a A second illumination light; a first wavelength conversion element disposed on the light path of the first illumination light, the first wavelength conversion element including a layer of at least partially transmissive material, and the first light source An illumination light is converted into a third illumination light of different wavelengths; a first spatial light modulator and a second spatial light modulator, the first spatial light modulator and the second spatial light modulator, Individually including a plurality of independent units arranged in an array can accept a signal, and according to the signal, change the optical characteristics of the plurality of independent units, thereby modulating the illumination light illuminating the plurality of independent units and outputting image light individually; the The first spatial light modulator is disposed on the travel path of the third illumination light and can receive the third illumination light; and the second spatial light modulator is disposed on the travel path of the second illumination light; One light optical element Including a material that is at least partially transmissive, and can receive and combine a first image light from the first spatial light modulator and a second image light from the second spatial light modulator to output a first Three image light; wherein the light combining optical element substantially only receives image light from the first spatial light modulator and the second spatial light modulator. An optical system includes: a first light source to generate a first illumination light; a second light source to generate a second illumination light; a fluorescent optical element provided with a phosphor powder layer and disposed on the first illumination The light path of the light can receive the first illumination light and output a third illumination light, and the third illumination light is green light; a first light valve is disposed on the light path of the green illumination light and receives the third The illumination light can convert the third illumination light into a first image light; a second light valve, which is arranged on the light path of the second illumination light, can convert the second illumination light into a second image light; A first frame is disposed on the optical path of the first image light; a second frame is disposed on the optical path of the second image light; a light combining element includes a first light incident surface and a second The light incident surface, the light combining element is disposed on the light path of the first image light and the second image light, and can combine the first image light passing through the first frame and the first light incident surface, and Prism and the second image of the second light to the second light incident surface, and outputs the image light through a combination of And a first lens group disposed on the image light through the optical path bound. The optical system according to claim 1, wherein the first spatial light modulator and the second spatial light modulator are respectively a digital miniature mirror element. The optical system according to claim 1 or 2, wherein a time length of the received third illumination light in a specified time length is more than 60% of the specified time length. The optical system according to claim 1, wherein the first wavelength conversion element is a reflective monochrome fluorescent wheel. The optical system according to claim 1, further comprising a second wavelength conversion element disposed between the second light source and the optical path of the second spatial light modulator. The second wavelength conversion element may The second illumination light of the second light source is converted into a fourth illumination light of a different wavelength. The second wavelength conversion element is a fluorescent wheel and includes a motor and a substrate connected to the motor. The substrate is provided with a reflection area. And a penetrating area, the reflecting area is provided with a material layer including a phosphor and a reflecting layer, the reflecting layer is disposed between the reflecting layer and the phosphor layer, and the material layer is used for receiving the first The two illumination lights output the fourth illumination light. The spectrum of the fourth illumination light has a peak wavelength, and the peak wavelength is between 600 nm and 765 nm. The optical system according to claim 1, further comprising: a first beam splitter disposed between the first light source, the first wavelength conversion element, and the optical path of the first spatial light modulator, the a first dichroic mirror reflecting blue light and lets green light penetrates; a first lens group disposed between the first dichroic mirror and the wavelength of the first optical path converting element; a first Prism, disposed on the first beam splitter Between the mirror and the optical path of the first spatial light modulator, the first chirp is a reverse total reflection chirp; a first light homogenizing element is provided on the first chirp and the first beam splitter Between the light paths, the first light homogenizing element is a fly-eye lens; a second wavelength conversion element is provided between the second light source and the light path of the second spatial light modulator, and the second wavelength conversion element is a A fluorescent wheel, the fluorescent wheel includes a light-transmitting surface and a light-reflecting surface, and a material layer including a fluorescent powder is provided on the light-reflecting surface to output red light; a second beam splitter is provided on the second light source and the Between the light paths of the second wavelength conversion element, the second beam splitter reflects red light and allows blue Light penetration; a second lens group is disposed between the second beam splitter and the optical path of the second wavelength conversion element; a third dichroic mirror is disposed between the second beam splitter and the second spatial light adjustment Between the light paths of the converter, the third dichroic mirror reflects blue light and allows red light to penetrate; a second frame is provided between the second spatial light modulator and the light path of the third dichroic mirror, The second chirp is a reverse total reflection chirp; a second homogenizing element is disposed between the second chirp and the third dichroic mirror, and the second homogeneous element is a fly-eye lens; A light combining optical element is provided between the light paths of the first frame and the second frame; a first lens group includes a plurality of lenses, and the first lens group is provided between the first frame and the combined light Between the optical paths of the optical elements; a second lens group including a plurality of lenses, the second lens group being disposed between the second frame and the optical path of the combining optical element; and a third lens group including at least A lens, the light combining optical element is disposed between the light paths of the first lens group, the second lens group and the third lens group; Wherein the first spatial light modulator and the second spatial light modulator are respectively a digital micro-mirror element, and the first wavelength conversion element is a fluorescent wheel of a monochrome reflection type, and the fluorescent wheel includes a reflective surface A phosphor layer is disposed on the reflective surface, and the phosphor layer absorbs blue light and outputs green light. An optical system includes: a first light source to generate a first illumination light; a second light source to generate a second illumination light; a fluorescent optical element provided with a phosphor powder layer and disposed on the first illumination The light path of the light can receive the first illumination light and output a green illumination light; a first light valve is disposed on the light path of the green illumination light and receives the green illumination light, and can convert the green illumination light into a A first image light; a second light valve disposed on the light path of the second illumination light, which can convert the second illumination light into a second image light; a first frame disposed on the first image light A light beam; a second beam set on the light path of the second image light; a beam splitter including a first light incident surface and a second light incident surface; the light beam splitter is disposed on the first image light And the optical path of the second image light, the first image light passing through the first frame and the first light incident surface, and the first image light passing through the second frame and the second light incident surface can be combined two image light and outputs image light upon binding; and a first lens group disposed in the warp Optical path of the image light engaged. The optical system according to claim 8, wherein the fluorescent optical element is a reflective monochrome fluorescent wheel. The optical system according to claim 8, wherein the first light valve and the first light valve are respectively a digital miniature mirror element.