JP7001974B2 - Light source device and projection device - Google Patents

Description

The present invention relates to a light source device and a projection device including the light source device.

Today, projectors that focus the light emitted from a light source on a micromirror display element called a DMD (Digital Micromirror Device) or a display element such as a liquid crystal plate and display a color image on the screen are generally used. Has been done.

For example, in Patent Document 1, an excitation light source, an optical wheel on which a phosphor layer is formed, a dichroic mirror provided between the wheel and the excitation light source, and a dichroic mirror provided between the wheel and the dichroic mirror. An image display device (light source device) including a 1/4 wavelength plate which is a polarization conversion element for changing the polarization direction of the excitation light is disclosed.

Japanese Unexamined Patent Publication No. 2012-212129

In the light source device of Patent Document 1, each phosphor layer that emits different colors provided on the wheel is irradiated with excitation light to emit light in the red and green wavelength bands. However, since the wheel is composed of a substrate that is a body of revolution and a rotation control unit that performs rotation and rotation control, the light source device may become large in size.

In view of the above points, it is an object of the present invention to provide a light source device and a projection device that can be miniaturized with a simple configuration.

The light source device of the present invention reflects the first light source that emits the first wavelength band light, the second light source that emits the second wavelength band light, and the first wavelength band light incident at the first incident angle. A first dichroic mirror that transmits the second dichroic band light incident at a second incident angle different from the first incident angle, and a second dichroic that reflects the second wavelength band light transmitted through the first dichroic mirror. A mirror is provided, and the second wavelength band light is reflected by the second dichroic mirror, and then incident on the first dichroic mirror at the first incident angle and reflected.

The projection device of the present invention projects the above-mentioned light source device, a display element that is irradiated with the light source light from the light source device to form an image light, and the image light emitted from the display element onto a projected object. It is characterized by having a projection optical system and a projection device control unit that controls the display element and the light source device.

According to the present invention, it is possible to provide a light source device and a projection device that can be miniaturized with a simple configuration.

It is a figure which shows the functional circuit block of the projection apparatus which concerns on Embodiment 1 of this invention. It is a plane schematic diagram which shows the internal structure of the projection apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the transmission characteristic of the 1st dichroic mirror which concerns on Embodiment 1 of this invention, and the wavelength band distribution of light. It is a partial plane schematic diagram of the light source apparatus which concerns on Embodiment 1 of this invention. It is a partial plane schematic diagram of the light source apparatus which concerns on Embodiment 2 of this invention. (A) is a partial plan view of the light source device according to the third embodiment of the present invention, and (b) is an enlarged view showing an enlarged central portion of FIG. 6 (a).

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described. FIG. 1 is a diagram showing a functional circuit block of the projection device 10. The projection device control unit includes a CPU including an image conversion unit 23 and a control unit 38, a front-end unit including an input / output interface 22, a display encoder 24, and a formatter unit including a display drive unit 26. Image signals of various standards input from the input / output connector unit 21 are converted by the image conversion unit 23 via the input / output interface 22 and the system bus (SB) so as to be unified into an image signal of a predetermined format suitable for display. After that, it is output to the display encoder 24.

The display encoder 24 expands and stores the input image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display drive unit 26.

The display drive unit 26 drives the display element 50, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal output from the display encoder 24. Then, the projection device 10 irradiates the display element 50 with the light beam emitted from the light source device 60 via the light guide optical system to form an optical image with the reflected light of the display element 50, and the projection optical system The image is projected and displayed on a projected object such as a screen (not shown) via the 220. The movable lens group 235 of the projection optical system 220 can be driven by the lens motor 45 for zoom adjustment and focus adjustment.

The image compression / decompression unit 31 performs recording processing in which the luminance signal and color difference signal of the image signal are data-compressed by processing such as ADCT and Huffman coding and sequentially written to the memory card 32 which is a detachable recording medium. Further, the image compression / decompression unit 31 reads out the image data recorded in the memory card 32 in the reproduction mode, and decompresses the individual image data constituting the series of moving images in units of one frame. The image compression / decompression unit 31 outputs the image data to the display encoder 24 via the image conversion unit 23, and performs a process that enables display of a moving image or the like based on the image data stored in the memory card 32. ..

The control unit 38 controls the operation of each circuit in the projection device 10, and is composed of a ROM that fixedly stores operation programs such as a CPU and various settings, and a RAM that is used as a work memory. There is.

The operation signal of the key / indicator unit 37 composed of the main key and the indicator provided on the upper panel of the housing is directly transmitted to the control unit 38. The key operation signal from the remote controller is received by the Ir receiving unit 35, and the code signal demodulated by the Ir processing unit 36 is output to the control unit 38.

The control unit 38 is connected to the voice processing unit 47 via the system bus (SB). The voice processing unit 47 includes a sound source circuit such as a PCM sound source, converts voice data into analog in the projection mode and the reproduction mode, and drives the speaker 48 to make a loudspeaker sound.

Further, the control unit 38 controls the light source control circuit 41 as the light source control unit. The light source control circuit 41 includes a light source unit 700 (first light source 710 and second light source 720) and a red light source device 380, which will be described later, so that light in a predetermined wavelength band required at the time of image generation is emitted from the light source device 60. Operation of the light source device 60 including (third light source 310) and the like (for example, by turning on and off the first light source 710, the second light source 720, and the third light source 310 in a time-divided manner, the light source device 60 can receive arbitrary light (second light source 310). It is possible to control the operation) of emitting light) produced by additively mixing three lights emitted from the light source 720, the phosphor 110 described later, and the third light source 310.

Further, the control unit 38 causes the cooling fan drive control circuit 43 to detect the temperature by a plurality of temperature sensors provided in the light source device 60 and the like, and controls the rotation speed of the cooling fan from the result of the temperature detection. Further, the control unit 38 keeps the cooling fan rotating even after the power of the projection device 10 is turned off by a timer or the like in the cooling fan drive control circuit 43, or depending on the result of temperature detection by the temperature sensor, the projection device 10 main body. Controls such as turning off the power of.

Next, the internal structure of the projection device 10 will be described. FIG. 2 is a schematic plan view showing the internal structure of the projection device 10. Here, the housing of the projection device 10 is formed in a substantially box shape, and includes a front panel 12, a back panel 13, a right panel 14, and a left panel 15. In the following description, the left and right in the projection device 10 indicate the left-right direction with respect to the projection direction, and the front-back means the front-back direction with respect to the screen side direction of the projection device 10 and the traveling direction of the light flux. ..

The projection device 10 includes a control circuit board 242 in the vicinity of the left panel 15. The control circuit board 242 includes a power supply circuit block, a light source control block, and the like. Further, the projection device 10 includes a light source device 60 in a substantially central portion of the housing of the projection device 10. Further, in the projection device 10, a light source side optical system 170 and a projection optical system 220 are arranged between the light source device 60 and the left panel 15.

The light source device 60 includes a first light source 710 which is a light source of the first wavelength band light, a second light source 720 which is a light source of the second wavelength band light, and a third light source 310 which is a light source of the fourth wavelength band light. It includes a phosphor 110 that emits a third wavelength band light using the first wavelength band light as excitation light, a first dichroic mirror 140, a second dichroic mirror 141, a first reflection mirror 705, and a second reflection mirror 706. .. A power connector 57 and a heat sink 150 are arranged between the light source device 60 and the right side panel 14 in order from the back panel 13 side. Further, the light source device 60 includes a heat pipe 130 for guiding the heat generated by the red light source device 380 (third light source 310) to the heat sink 150, and a cooling fan 261 for cooling the heat sink 150. The red light source device 380 (third light source 310) is cooled by the heat sink 81 in addition to the cooling fan 261, the heat pipe 130, and the heat sink 150 described above.

The light source unit 700, which is a light source unit, is arranged on the right side panel 14 side of the back panel 13 side of the projection device 10. The first wavelength band light and the second wavelength band light emitted by the first light source 710 and the second light source 720 of the present embodiment are blue wavelength band light, respectively. The first light source 710 and the second light source 720 each include a plurality of blue laser diodes 71 as semiconductor light emitting devices. The plurality of blue laser diodes 71 of the first light source 710 and the second light source 720 are held by a common holding member 701. On the optical axis of each blue laser diode 71, a collimator lens 73 that converts light into parallel light is arranged so as to enhance the directivity of the light emitted from each blue laser diode 71.

In this embodiment, since the first light source 710 and the second light source 720 use the same blue laser diode 71, the wavelength bands of the first wavelength band light and the second wavelength band light are the same. However, the first light source 710 and the second light source 720 may be composed of blue laser diodes having different wavelengths, and the wavelength bands of the first wavelength band light and the second wavelength band light may be different. Alternatively, as an example in which the first light source 710 and the second light source 720 are light emitting elements that emit light in different wavelength bands, the second light source 720 is a blue laser diode 71, and the first light source 710 is a laser diode that emits ultraviolet light. It may be used as a light source element such as. In this case, the cut-on wavelength of P-polarization, which will be described later in FIG. 3, can be arranged on the shorter wavelength side than the ultraviolet wavelength band light.

Although the front view is not shown, the plurality of blue laser diodes 71 of the first light source 710 and the second light source 720 are arranged in a matrix of 2 rows and 5 columns by the holding member 701. The number of blue laser diodes 71 constituting the first light source 710 and the second light source 720 is not limited to a plurality, and may be one for each. In other words, the first light source 710 and the second light source 720 are composed of one or a plurality of blue laser diodes 71. In the light source unit 700 of the present embodiment, the three rows of blue laser diodes 71 (total of six) located in front of the front panel 12 side are used as the first light source 710, and the two rows of blue laser diodes 71 (total) on the back side are used as the first light source. 4) is the second light source 720. The first light source 710 and the second light source 720 emit light in a predetermined polarization direction, respectively. In the present embodiment, the polarization directions of all the blue laser diodes 71 in the first light source 710 and the second light source 720 are aligned so as to be the same, and the blue laser emitted by the first light source 710 and the second light source 720 is emitted. The diode 71 is all incident on the first dichroic mirror 140 in the direction of P polarization by the first reflection mirror 705 or the second reflection mirror 706.

The first light source 710 includes one or a plurality of blue laser diodes 71, and a collimator lens 73 arranged on the optical axis of each blue laser diode 71, respectively. Further, the second light source 720 includes one or a plurality of blue laser diodes 71 and a collimator lens 73 arranged on the optical axis of each blue laser diode 71.

The first reflection mirror 705 and the second reflection mirror 706 are arranged on the emission side of the light source unit 700 so that the light from the light source unit 700 is incident. That is, the first reflection mirror 705 is arranged so that the first wavelength band light emitted from the first light source 710 is incident, and the second reflection is incident so that the second wavelength band light emitted from the second light source 720 is incident. The mirror 706 is arranged. Further, the first reflection mirror 705 is tilted so as to be incident on the first dichroic mirror 140 within the first incident angle θ1, which will be described later, and the second reflection mirror 706 is the second incident angle described later on the first dichroic mirror 140. It is tilted so that it is incident within θ2. That is, in the first reflection mirror 705 on which the first reflection surface for reflecting the first wavelength band light is formed and the second reflection mirror 706 on which the second reflection surface for reflecting the second wavelength band light is formed, the first The reflective surface and the second reflective surface are not parallel to each other.

In the present embodiment, the first reflection mirror 705 and the second reflection mirror 706 are provided with the same number of rows as the blue laser diode 71 constituting the first light source 710 and the second light source 720 (in the present embodiment, the first light source). Since the 710 has three rows and the second light source 720 has two rows, the first reflection mirror 705 has three rows and the second reflection mirror 706 has two rows). Further, the number of the first reflection mirror 705 and the second reflection mirror 706 may be the same as that of the blue laser diode 71. When a plurality of first reflection mirrors 705 and second reflection mirrors 706 are provided, the overall width of the light beam bundle after reflection by the first reflection mirror 705 and the second reflection mirror 706 is reduced by arranging each of them in a stepped manner. Can be. The number of columns of the first reflection mirror 705 and the second reflection mirror 706 is not limited to the same as that of the blue laser diode 71 constituting the first light source 710 and the second light source 720. For example, even if the blue laser diodes 71 constituting the first light source 710 have three rows, the first reflection mirror 705 having a size capable of reflecting all the light of the three rows of blue laser diodes 71 is the first. The number of reflection mirrors 705 may be one. Similarly, the second reflection mirror 706 may be composed of one reflection mirror corresponding to the plurality of blue laser diodes 71.

In the light source device 60 of the present embodiment, the diffuser plate 703 is arranged between the first reflection mirror 705 and the first dichroic mirror 140, and the diffuser plate 704 is arranged between the second reflection mirror 706 and the first dichroic mirror 140. Will be done. The diffuser plate 703 and the diffuser plate 704 transmit light to perform diffusion shaping of light. The diffuser plate 703 can make the intensity distribution of the first wavelength band light applied to the phosphor 110 uniform, and can improve the luminous efficiency and the service life of the phosphor 110. The diffuser plate 704 can reduce the speckle noise of the image projected on the projected object by making the intensity distribution of the second wavelength band light uniform.

The red light source device 380 includes a third light source 310 and a condenser lens group 311 (condenser lens 312 and condenser lens 313) that collects the light emitted from the third light source 310. The third light source 310 is composed of a red light emitting diode 300. The red light emitting diode 300 is a semiconductor light emitting device that emits fourth wavelength band light, which is red wavelength band light. The number of red light emitting diodes 300 constituting the third light source 310 is one in FIG. 2 (same in FIGS. 4 and 5), but may be plural.

The green light source device 100 includes a phosphor 110, a condensing lens group 111 (condensing lens 112 and condensing lens 113) that condenses the reflected light from the first dichroic mirror 140 and the emitted light from the phosphor 110. To prepare for. The phosphor 110 is a green phosphor that emits fluorescent light (third wavelength band light) using the first wavelength band light as excitation light. The phosphor 110 of the present embodiment is a fluorescent plate formed and fixed on a mirrored flat surface, but may be a rotationally driven fluorescent wheel in which a green fluorescent substance is formed in the circumferential direction. However, if the fluorescent wheel is used, the phosphor 110 may become large and power consumption for rotation is generated. Therefore, by using a fixed fluorescent plate, it is possible to reduce the size and power consumption of the light source device 60.

The first dichroic mirror 140 is a mirror that transmits light in a predetermined wavelength band to be incident on and reflects light in a wavelength band different from the predetermined wavelength band. Further, the first dichroic mirror 140 has an incident angle-dependent characteristic that is transmitted or reflected depending on the incident angle of the incident light. The incident angle-dependent characteristics of the first dichroic mirror 140 will be described with reference to FIG. FIG. 3 shows the transmission characteristics of the first dichroic mirror 140 and the light incident on the first dichroic mirror 140 when light whose polarization directions are P-polarized and S-polarized is incident on the first dichroic mirror 140 at different incident angles. It is a figure which shows the wavelength band distribution of. The lower horizontal axis of FIG. 3 indicates the wavelength, and the left vertical axis indicates the transmittance. The vertical axis on the right side shows the light intensities of the first wavelength band light L1, the second wavelength band light L2, the third wavelength band light L3, and the fourth wavelength band light L4 shown in FIG. In the broken line, one-dot chain line, two-dot chain line, and three-point chain line, P-polarized light was incident at 55 degrees, S-polarized light was incident at 55 degrees, and P-polarized light was incident at 25 degrees. This is the transmission characteristic of the first dichroic mirror 140 in the case where the S-polarized light is incident at 25 degrees.

Here, the transmittance means a case where the light transmittance is 50% or more, and the reflection means a case where the light transmittance is less than 50%. The characteristics of general dichroic mirrors including the first dichroic mirror 140 are cut-on wavelengths that are transmitted and reflected by the polarization direction (P-polarization or S-polarization) and the angle of incidence (waves that reach 50% transmittance). C1 and the cutoff wavelength C2), which is a wavelength that drops to 50% (less than) transmittance, are different, and there are polarization direction dependence and incident angle dependence.

Regarding the polarization direction dependence, the first dichroic mirror 140 transmits the wavelength component over a wide band even when the light incident with P polarization is incident at the same incident angle than the light incident with S polarization. .. The P-polarized cut-on wavelength C1 is located on the shorter wavelength side than the S-polarized cut-on wavelength C1, and the P-polarized cut-off wavelength C2 is located on the longer wavelength side than the S-polarized cut-off wavelength C2.

Regarding the incident angle dependence, in the first dichroic mirror 140, as the incident angle of the incident light increases, the cut-on wavelength C1 and the cut-off wavelength C2 shift to the shorter wavelength side in both P-polarization and S-polarization. The degree of incident angle dependence of the first dichroic mirror 140 differs between P-polarized light and S-polarized light, and when the incident angle of the incident light is increased, the cut-on wavelength C1 of P-polarized light changes more than that of S-polarized light. On the other hand, when the incident angle of the incident light is increased, the cutoff wavelength C2 of the S-polarized light changes more than that of the P-polarized light.

The first dichroic mirror 140 has the positions of the cut-on wavelength C1 and the cut-off wavelength C2, and the incident angle dependence and the polarization direction dependence of the first dichroic mirror 140 (changes in the cut-on wavelength C1 and the cut-off wavelength C2). The degree) can be changed by design.

In FIG. 3, the transmission of P-polarized and S-polarized light when the light is incident on the first dichroic mirror 140 at a relatively small incident angle of 25 degrees and when the light is incident on the first dichroic mirror 140 at a relatively large incident angle of 55 degrees. It shows the characteristics. For example, when light having P polarization is incident on the first dichroic mirror 140 at an incident angle of 25 degrees, the cut-on wavelength C1 is about 475 nm and the cutoff wavelength C2 is about 625 nm, as shown by the two-dot chain line. Is. Further, when light having P polarization is incident on the first dichroic mirror 140 at an incident angle of 55 degrees, the cut-on wavelength C1 is about 435 nm and the cut-off wavelength C2 is about 595 nm, as shown by the broken line. .. For example, if the wavelength of the incident light is 455 nm, it can be reflected if the incident angle is 25 degrees and transmitted if the incident angle is 55 degrees. Further, if the incident angle reflected when light is incident on the first dichroic mirror 140 is the first incident angle θ1 and the transmitted incident angle is the second incident angle θ2, the second incident angle θ2 is the first incident angle. The angle is larger than the angle θ1.

Here, the first dichroic mirror 140 reflects the first wavelength band light L1 and the second wavelength band light L2 when they are incident at the first incident angle θ1, and the first wavelength band light L1 and the second wavelength band light L2. Is transmitted when it is incident at the second incident angle θ2. For example, for light that is P-polarized, if the first incident angle θ1 is 25 degrees and the second incident angle θ2 is 55 degrees, the wavelengths of the first wavelength band light L1 and the second wavelength band light L2 are 435 nm to 475 nm. It may be within the separable band W1 in the range of. In this case, the first dichroic mirror 140 can reflect and transmit and separate the optical paths of the first wavelength band light L1 and the second wavelength band light L2 depending on the incident angle, respectively.

As described above, in the first dichroic mirror 140, the cut-on wavelength C1 and the cut-off wavelength C2 shift to the shorter wavelength side as the incident angle increases. Then, in the first dichroic mirror 140, the cut-on wavelength C1 and the cut-off wavelength C2 shift to the longer wavelength side as the incident angle becomes smaller. Therefore, the width of the separable band W1 can be widened by at least either lowering the angle of the first incident angle θ1 or increasing the second incident angle θ2, and the first wavelength band light L1 and the first wavelength band light L1 and the first. The wavelength selection range of the two-wavelength band light L2 (for example, the range that can be taken as the peak wavelength P1 of the first wavelength band light L1 and the second wavelength band light L2, or half of the first wavelength band light L1 and the second wavelength band light L2. The size of the price range) can be expanded.

Here, since the third wavelength band light L3 has a wavelength band of 500 nm to 570 nm as a main component, it substantially transmits the first dichroic mirror 140 regardless of the incident angle of the third wavelength band light L3. Since the fourth wavelength band light L4 has a wavelength band of 650 nm to 710 nm as a main component, it substantially reflects the first dichroic mirror 140 regardless of the incident angle of the fourth wavelength band light L4. Therefore, the first dichroic mirror 140 has a transmission characteristic of transmitting the third wavelength band light L3 and reflecting the fourth wavelength band light L4. Further, since the first dichroic mirror 140 substantially transmits and substantially reflects the third wavelength band light L3 and the fourth wavelength band light L4, respectively, regardless of the incident angle, the phosphor 110 that emits the third wavelength band light L3. The width (degree of freedom) of the layout of the third light source 310 that emits the fourth wavelength band light L4 is widened, which contributes to the realization of miniaturization of the light source device 60 and the projection device 10.

Returning to FIG. 2, the second dichroic mirror 141 is a mirror that transmits or reflects incident light. The second dichroic mirror 141 has a transmission characteristic of reflecting the second wavelength band light emitted from the second light source 720 and transmitting the fourth wavelength band light emitted from the third light source 310. The second dichroic mirror 141 has an incident angle-dependent characteristic that is transmitted or reflected depending on the incident angle, like the first dichroic mirror 140.

Generally, a dichroic mirror is made by applying a reflective coating that reflects light of a specific wavelength to a transparent substrate such as glass. In the present embodiment, the second dichroic mirror 141 is provided with a reflection coat capable of reflecting the second wavelength band light regardless of its incident angle. Further, the second dichroic mirror 141 is known to have a place where the second wavelength band light emitted from the second light source 720 is irradiated and a place where the fourth wavelength band light emitted from the third light source 310 is irradiated. If this is the case, the second wavelength band light reflection processing may be performed only in the vicinity of the irradiation point of the second wavelength band light. For example, the optical path of the second wavelength band light is located on the right side of the second dichroic mirror 141 in the long direction shown in FIG. 2, and the optical path of the fourth wavelength band light is located on the left side of the second dichroic mirror 141 in the long direction. In this case, the second dichroic mirror 141 can be created by applying a reflection coating of the second wavelength band light from the right end to the center of the second dichroic mirror 141 in the long direction.

The light source side optical system 170 includes a condenser lens 173, a light guide device such as a light tunnel or a glass rod, condenser lenses 178 and 179, an irradiation mirror 185, and a condenser lens 195. The condenser lens 195 is also a part of the projection optical system 220 because the image light emitted from the display element 50 arranged on the rear panel 13 side of the condenser lens 195 is emitted toward the projection optical system 220.

The condenser lens 173 is arranged in the vicinity of the incident port of the light guide device 175 and collects the light source light from the light source device 60. The luminance distribution of each color wavelength band light collected by the condenser lens 173 is made uniform by the light guide device 175. The light beam bundle emitted from the exit port of the light guide device 175 is focused by the condenser lenses 178 and 179, and then guided to the irradiation mirror 185 side.

The irradiation mirror 185 reflects the light beam focused by the condenser lenses 178 and 179, and causes the display element 50 to irradiate the display element 50 at a predetermined angle via the condenser lens 195. A heat sink 190 is provided on the back panel 13 side of the display element 50, which is a DMD, and the display element 50 is cooled by the heat sink 190.

The light bundle, which is the light source light applied to the image forming surface of the display element 50 by the light source side optical system 170, is reflected by the image forming surface of the display element 50 and projected onto the screen as projected light via the projection optical system 220. The light source. Here, the projection optical system 220 is composed of a condenser lens 195, a movable lens group 235, a fixed lens group 225, and the like. The movable lens group 235 is formed so as to be movable by a lens motor or manually. Further, the movable lens group 235 and the fixed lens group 225 are built in the fixed lens barrel. Therefore, the fixed lens barrel provided with the movable lens group 235 is a variable focus type lens, and is formed so that zoom adjustment and focus adjustment are possible.

By configuring the projection device 10 in this way, when light is emitted from the light source device 60 at an appropriate timing, each wavelength band light such as blue, green, and red is incident on the display element 50 via the light source side optical system 170. Will be done. Therefore, the DMD, which is the display element 50 of the projection device 10, can project a color image on the screen by displaying the light of each color in a time-division manner according to the data.

Next, the optical path in the light source device 60 will be described. FIG. 4 shows a part of the optical path of the first wavelength band light to the fourth wavelength band light in the present embodiment. The first wavelength band light emitted from the first light source 710 is reflected by the first reflection mirror 705 toward the first dichroic mirror 140. Further, the first wavelength band light reflected by the first reflection mirror 705 is diffused to a diffusion angle preset by the diffuser plate 703, and is used as P-polarized light on the first dichroic mirror 140 at the first incident angle θ1. Incident. The first incident angle θ1 in FIG. 4 can be, for example, 25 degrees. As shown in FIG. 3, the first wavelength band light incident at the first incident angle θ1 is reflected on the phosphor 110 side because it is located on the shorter wavelength side than the cut-on wavelength C1. The first wavelength band light from the first light source 710 reflected by the first dichroic mirror 140 is collected by the condenser lens group 111 and irradiated to the phosphor 110.

The phosphor 110 is excited by the first dichroic mirror 140 and emits a third wavelength band light (green wavelength band light) which is fluorescent light in all directions. The third wavelength band light emitted from the phosphor 110 is condensed by the condenser lens group 111 and guided to the first dichroic mirror 140. As shown in FIG. 3, since the first dichroic mirror 140 substantially transmits the third wavelength band light, most of the third wavelength band light incident on the first dichroic mirror 140 is a collection of the light source side optical system 170. It is incident on the optical lens 173.

The second wavelength band light emitted from the second light source 720 is reflected by the second reflection mirror 706 toward the first dichroic mirror 140. Further, the second wavelength band light reflected by the second reflection mirror 706 is diffused to a diffusion angle preset by the diffuser plate 704, and is used as P-polarized light on the first dichroic mirror 140 at a second incident angle θ2. Incident. The second incident angle θ2 in FIG. 4 can be, for example, 55 degrees. As shown in FIG. 3, the second wavelength band light incident at the second incident angle θ2 is located on the longer wavelength side than the cut-on wavelength C1, so that it is transmitted to the second dichroic mirror 141 side. The second wavelength band light from the second light source 720 transmitted through the first dichroic mirror 140 is reflected by the second dichroic mirror 141 and is incident on the first dichroic mirror 140 as P-polarized light at a first incident angle θ1. The first incident angle θ1 of the second wavelength band light is set to the same angle as or different from the first incident angle θ1 of the first wavelength band light. Since the second wavelength band light incident from the second dichroic mirror 141 at the first incident angle θ1 (for example, an angle of 25 degrees) is located on the shorter wavelength side than the cut-on wavelength C1 as shown in FIG. , It is reflected on the condenser lens 173 side of the light source side optical system 170. Therefore, the second wavelength band light reflected by the first dichroic mirror 140 is incident on the condenser lens 173 of the light source side optical system 170.

The fourth wavelength band light emitted from the third light source 310 is condensed by the condenser lens group 311 and guided to the second dichroic mirror 141. As described above, the second dichroic mirror 141 transmits the fourth wavelength band light. Therefore, the fourth wavelength band light incident on the second dichroic mirror 141 passes through the second dichroic mirror 141 and is incident on the first dichroic mirror 140. The fourth wavelength band light incident on the first dichroic mirror 140 is reflected on the condenser lens 173 side of the light source side optical system 170 because the first dichroic mirror 140 has a characteristic of reflecting the fourth wavelength band light. Therefore, the fourth wavelength band light reflected by the first dichroic mirror 140 is incident on the condenser lens 173 of the light source side optical system 170.

As described above, the second wavelength band light to the fourth wavelength band light (blue wavelength band light, green wavelength band light, red wavelength band light) focused on the condenser lens 173 are used as the light source light of the light source device 60. It is combined in the same optical path and emitted to the projection optical system 220 side via the light source side optical system 170.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described. In the description of the present embodiment, the same components as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted or simplified. As shown in FIG. 5, in the present embodiment, the λ / 2 wave plate 722 is arranged between the first reflection mirror 705 and the diffuser plate 703 on the optical path of the first wavelength band light. The λ / 2 wave plate 722 has an action of rotating the polarization direction by 90 degrees, and can convert the first wavelength band light emitted by P polarization into S polarization. Therefore, the S-polarized first wavelength band light and the P-polarized second wavelength band light are incident on the first dichroic mirror 140.

For example, it is assumed that the S-polarized first wavelength band light is incident on the first dichroic mirror 140 at 25 degrees, and the P-polarized second wavelength band light is incident on the first dichroic mirror 140 at 55 degrees. Here, referring to FIG. 3, the S-polarized light incident at 25 degrees has a higher cut-on wavelength C1 than the P-polarized light incident at the same 25 degrees. Therefore, the width of the separable band W2 of the first wavelength band light L1 and the second wavelength band light L2 is wider than that of the separable band W1. That is, the present embodiment can be taken as a selection width of the first wavelength band light and the second wavelength band light (for example, the peak wavelength P1 of the first wavelength band light L1 and the second wavelength band light L2) as compared with the first embodiment. The range and the size of the half-price width of the first wavelength band light L1 and the second wavelength band light L2) are widened.

Further, the λ / 2 wave plate 722 may be arranged between the second reflection mirror 706 and the diffuser plate 704 on the optical path of the second wavelength band light. When the λ / 2 wave plate 722 is arranged between the second reflection mirror 706 and the diffuser plate 704, the first dichroic mirror 140 contains the first wavelength band light of P polarization and the second wavelength band light of S polarization. Since they are incident at the first incident angle θ1 and the second incident angle θ2, respectively, referring to FIG. 3, the separable band W1 has a narrower bandwidth than the separable band W1 and the separable band W2, and the first wavelength band. Although the selection range of light and second wavelength band light is narrowed, there is an advantage that the degree of freedom in the configuration layout of the light source device 60 is increased. Even when the λ / 2 wavelength plate 722 is arranged between the second reflection mirror 706 and the diffuser plate 704, the blue laser diode 71 of the first light source 710 and the second light source 720 is the first dichroic mirror 140. If the S-polarized light is arranged so as to be emitted, the first wavelength band light L1 and the second wavelength band light L2 can be separated by the separable band W2.

(Modification 1)
Next, a modification 1 of the present invention will be described. In the description of this modification, the description of the same configurations as those of the first and second embodiments will be omitted or simplified. In this modification, the first dichroic mirror 140 is movable around a point that is the center in the long direction and the center in the short direction of the first dichroic mirror 140. The movable first dichroic mirror 140 can adjust the incident angles of the first wavelength band light and the second wavelength band light in a time division manner. As a result, in the first embodiment, the first reflection mirror 705 and the first reflection mirror 705, which have played a role of incident the first wavelength band light and the second wavelength band light on the first dichroic mirror 140 at the first incident angle θ1 and the second incident angle θ2. It is also possible to use a light source device 60 that does not include the second reflection mirror 706. Alternatively, even when the first dichroic mirror 140 is fixed, the first light source 710 and the second light source 720 are arranged so as to be non-parallel to each other, that is, the angle of the first light source 710 and the second light source 710. By tilting the angle of the light source 720 to a predetermined non-parallel angle, the first wavelength band light and the second wavelength band light incident on the first dichroic mirror 140 become non-parallel to each other, and the first reflection mirror 705 and the first reflection mirror 705 and the first. 2 Reflection mirror 706 is not required. The position of the rotation axis of the movable first dichroic mirror 140 is not limited to the central portion of the first dichroic mirror 140, and may be any position (for example, the center in the short direction and the left end in the long direction). Further, by configuring the configuration to include a plurality of first dichroic mirrors 140, each may be movable. Further, this modification is applicable to both the above-mentioned first and second embodiments.

(Modification 2)
Next, a modification 2 of the present invention will be described. In the description of the present modification, the description thereof will be omitted or simplified for the same configurations as those of the first embodiment, the second embodiment and the first modification. In this modification, the first reflection mirror 705 and the second reflection mirror 706 are not limited to those whose position and inclination angle are adjusted and fixed in advance, but are movable. The movable operation of the first reflection mirror 705 and the second reflection mirror 706 can change the position by approaching or moving away from the light source unit 700 (the first light source 710 and the second light source 720). For example, when the first reflection mirror 705 is moved, the optical path to the phosphor 110 is shortened by shortening the distance between the first reflection mirror 705 and the first light source 710 (blue laser diode 71), and the light converges. The property can be improved, and the effect of reducing the size of the phosphor 110 can be expected.

Further, in the movable operation of the first reflection mirror 705 and the second reflection mirror 706, the light from the first light source 710 and the second light source 720 is incident on the first dichroic mirror 140 at the first incident angle θ1 and the second incident angle θ2. The operation may be such that the tilt angle is changed. By changing the tilt angle of the first reflection mirror 705 and the second reflection mirror 706, the number of locations that can be adopted as the placement locations of the first light source 710 and the second light source 720 increases, and as a result, the number of configuration layouts of the light source device 60 increases. .. In particular, when the first reflection mirror 705 is made variable, the irradiation location of the first wavelength band light incident on the phosphor 110 can be changed, and as a result, the useful life of the phosphor 110 can be improved. It should be noted that this modification is applicable to both the above-mentioned first and second embodiments, and can be used in combination with the first embodiment.

Further, the movable operation of the first reflection mirror 705 and the second reflection mirror 706 includes changing the tilt angle of the first reflection mirror 705 and the second reflection mirror 706, the first reflection mirror 705 and the second reflection mirror 706, and the light source. A point where the distance between the unit 700 (first light source 710 and second light source 720) can be changed can be used together. In FIGS. 4 and 5, the first dichroic mirror 140 is placed at a position where all the light of the blue laser diode 71 does not directly hit the first dichroic mirror 140, and when the timing is blue, the first dichroic mirror 140 is shown in FIGS. 4 and 5. The 1-reflection mirror 705 is moved to a position separated from the blue laser diode 71 in the same manner as the 2nd reflection mirror 706, and the entire 2nd reflection mirror 706 and the 1st reflection mirror 705 are located on substantially the same inclined surface. By arranging in such a manner, it is possible to make all the light of the blue laser diode 71 incident on the first dichroic mirror 140 at an angle of the second incident angle θ2. With such a configuration, all the light of the blue laser diode 71 passes through the first dichroic mirror 140, so that all the light of the blue laser diode 71 can be used as blue.

Next, at the time of green timing, the second reflection mirror 706 of FIGS. 4 and 5 is brought closer to 71 in the same manner as the first reflection mirror 705, so that the entire second reflection mirror 706 and the first reflection mirror 705 are almost the same. By arranging them so as to be located on the same inclined surface, it is possible to make all the light of the blue laser diode 71 incident on the first dichroic mirror 140 at an angle of the first incident angle θ1. With such a configuration, all the light of the blue laser diode 71 is reflected by the first dichroic mirror 140 and irradiates the phosphor 110. Therefore, all the light of the blue laser diode 71 is used for the phosphor 110. Can be irradiated. Therefore, the light source light can be brightened.

Further, in the above-described embodiments 1 and 2 and the modified examples 1 and 2, an example in which the mirror surface of the fluorescent plate on which the phosphor 110 is formed is arranged toward the first dichroic mirror 140 and the light source side optical system 170 has been shown. , The fluorescent plate may be arranged so as to be tilted with respect to the optical axis connecting the first dichroic mirror 140 and the light source side optical system 170. As a result, even when the first wavelength band light is reflected by the mirror surface without exciting the phosphor 110, the first wavelength band light is guided to the light source side optical system 170 side and the third wavelength band. It is possible to prevent color mixing with light.

(Embodiment 3)
Next, the third embodiment of the present invention will be described with reference to FIG. 6A. FIG. 6A is a schematic plan view of a part of the light source device according to the third embodiment of the present invention. In the description of the third embodiment, the description thereof will be omitted or simplified for the same configurations as those of the first and second embodiments.

In the third embodiment, the holding member 701 in which the first light source 710 and the second light source 720 are held is a separate body. The holding member 701 in which the first light source 710 is held and the holding member 701 in which the second light source 720 is held are separated, and the arrangement position and arrangement direction of the first light source 710 and the second light source 720 are carried out. It has been changed with respect to the arrangement position and arrangement direction of the first embodiment and the second embodiment. That is, the first reflection mirror 705 and the second reflection mirror 706 are eliminated, and the light emitted from the first light source 710 and the second light source 720 is directly first without passing through the first reflection mirror 705 and the second reflection mirror 706. It is configured to be incident on the dichroic mirror 140.

The first light source 710 is arranged at a position and a predetermined angle such that the first wavelength band light emitted from the first light source 710 is incident on the first dichroic mirror 140 at a first incident angle θ1 (for example, 25 degrees). ing. Further, in the second light source 720, the second wavelength band light emitted from the second light source 720 has a second incident angle θ2 (for example, 55) larger than the first incident angle θ1 (for example, 25 degrees) on the first dichroic mirror 140. It is arranged at a position and a predetermined angle so that it is incident at (degrees).

6 (b) shows the approximate optical path of the second wavelength band light emitted from the first dichroic mirror 140 and the second dichroic mirror 141 of FIG. 6 (a) and the second light source 720 (emitted from the second light source 720). The optical path of one of the second wavelength band lights generated) is shown. FIG. 6B is an enlarged view showing an enlarged central portion of FIG. 6A. The second wavelength band light emitted from the second light source 720 is incident on the first dichroic mirror 140 at a second incident angle θ2 (for example, 55 degrees) larger than the first incident angle θ1 (for example, 25 degrees), and the first It passes through the dichroic mirror 140.

Next, the second wavelength band light transmitted through the first dichroic mirror 140 is incident on the second dichroic mirror 141 at a third incident angle θ3 (for example, 15 degrees) smaller than the first incident angle θ1 (for example, 25 degrees). , Reflected by the second dichroic mirror 141. The angle θ4 formed by the surface of the first dichroic mirror 140 and the surface of the second dichroic mirror 141 is about 40 degrees.

The second wavelength band light reflected by the second dichroic mirror 141 is incident on the first dichroic mirror 140 at a first incident angle θ1 (for example, 25 degrees) and is reflected by the first dichroic mirror 140. As a result, the second wavelength band light reflected by the first dichroic mirror 140 is incident on the condenser lens 173 of the light source side optical system 170.

The first incident angle θ1 (for example, 25 degrees), the second incident angle θ2 (for example, 55 degrees), and the third incident angle θ3 (for example, 15 degrees) of the second wavelength band light described in the third embodiment are the first embodiment. The same applies to the second embodiment. Further, the angle θ4 (about 40 degrees) formed by the surface of the first dichroic mirror 140 and the surface of the second dichroic mirror 141 described in the third embodiment is the same in the first and second embodiments.

As described above, according to the embodiment of the present invention, the light source device 60 uses the first light source 710 that emits the first wavelength band light, the second light source 720 that emits the second wavelength band light, and the first wavelength band light. As the excitation light, the phosphor 110 that emits the first wavelength band light and the third wavelength band light having a different wavelength band from the second wavelength band light, and the second wavelength band light and the third wavelength band light that reflect the first wavelength band light. It includes a first dichroic mirror 140 that transmits light in the wavelength band. The first light source 710, the second light source 720, and the phosphor 110 are provided on one surface side of the first dichroic mirror 140, and the first wavelength band light and the second wavelength band light incident on the first dichroic mirror 140 are provided. Are non-parallel to each other.

As a result, the first dichroic mirror 140 can transmit or reflect two lights having different incident angles (first wavelength band light and second wavelength band light) depending on the respective incident angles. Then, using the light reflected by the first dichroic mirror 140 (first wavelength band light) as excitation light, the phosphor 110 has a different wavelength band from the light incident on the first dichroic mirror 140 (first wavelength band light). Light (third wavelength band light) is emitted. Since the light emitted by the phosphor 110 (third wavelength band light) is transmitted through the first dichroic mirror 140, the light source device 60 is combined with the light transmitted through the first dichroic mirror 140 (second wavelength band light). Two types of light (second wavelength band light and third wavelength band light) can be emitted.

Further, the light source device 60 has a first reflection mirror 705 on which a first reflection surface that reflects the first wavelength band light is formed, and a second reflection that reflects the second wavelength band light and is not parallel to the first reflection surface. The surface is provided with the second reflection mirror 706, or the first light source 710 and the second light source 720 are arranged so as to be non-parallel to each other.

As a result, the first reflection surface and the second reflection surface formed on the first reflection mirror 705 and the second reflection mirror 706 are non-parallel, so that two lights (first wavelength band light and second wavelength band light) are present. ) Can be different in the angle of incidence on the first dichroic mirror 140. Even when the reflection mirror is not provided, the same effect as when the reflection mirror is provided can be obtained by arranging the first light source 710 and the second light source 720 in a non-parallel manner.

Further, the light source device 60 includes a λ / 2 wave plate 722 between either the first light source 710 or the second light source 720 and the first dichroic mirror 140. The polarization directions of the first wavelength band light and the second wavelength band light incident on the first dichroic mirror 140 are orthogonal to each other.

As a result, the two lights whose polarization directions are orthogonal to each other (first wavelength band light and second wavelength band light) are cut by the angle of incidence on the first dichroic mirror 140 as compared with the case of two lights having the same polarization direction. The difference in on-wavelength C1 may be large. The larger the difference between the cut-on wavelengths C1, the larger the wavelength range that can be selected as the wavelengths of the two lights incident on the first dichroic mirror 140. In addition, since the λ / 2 wave plate 722 may be provided on either the first light source 710 or the second light source 720, the degree of freedom in layout can be expanded.

Further, in the light source device 60, the first wavelength band light is incident on the first dichroic mirror 140 at the first incident angle θ1, and the second wavelength band light is incident on the first dichroic mirror 140 at a first incident angle θ1. The excitation light incident at the two incident angles θ2 and irradiating the phosphor 110 is the first wavelength band light reflected by the first dichroic mirror 140.

As a result, the first wavelength band light having a first incident angle θ1 with a small incident angle to the first dichroic mirror 140 can be reflected, and the second incident angle θ2 having a large incident angle to the first dichroic mirror 140 can be reflected. A certain second wavelength band light can be transmitted. Then, the first wavelength band light reflected by the first dichroic mirror 140 can be irradiated to the phosphor 110 to be the excitation light of the third wavelength band light.

Further, in the light source device 60, the first wavelength band light and the second wavelength band light pass through the diffuser plate before being incident on the first dichroic mirror 140. As a result, the light source device 60 reduces the speckle noise of the second wavelength band light projected on the projected object, and improves the luminous efficiency and the useful life of the phosphor 110. Diffuse shaping of the first wavelength band light and the second wavelength band light) can be performed.

Further, the light source device 60 has a third light source 310 that emits a fourth wavelength band light having a wavelength band different from that of the first wavelength band light to the third wavelength band light, and a second wavelength band light that has passed through the first dichroic mirror 140. A second dichroic mirror 141 that reflects light and transmits light in the fourth wavelength band is provided. As a result, the light source device 60 can emit another light (fourth wavelength band light) in addition to the two lights (second wavelength band light and third wavelength band light).

Further, in the light source device 60, the first dichroic mirror 140 transmits the second wavelength band light incident at the second incident angle θ2, is reflected by the second dichroic mirror 141, and then is incident at the first incident angle θ1. It reflects the second wavelength band light, reflects the fourth wavelength band light transmitted through the second dichroic mirror 141, and synthesizes the second wavelength band light to the fourth wavelength band light in the same optical path. As a result, the light source device 60 can synthesize and emit three lights (second wavelength band light to fourth wavelength band light) in the same optical path.

Further, the light source device 60 emits the first wavelength band light, the second wavelength band light, and the fourth wavelength band light in a time-divided manner by the first light source 710 to the third light source 310, respectively. As a result, the light source device 60 can additively mix the light emitted from the first light source 710 to the third light source 310.

Further, in the light source device 60, the first wavelength band light is blue wavelength band light or ultraviolet light, the second wavelength band light is blue wavelength band light, and the third wavelength band light is green wavelength band light. The four-wavelength band light is red wavelength band light. As a result, the light source device 60 can create green light from blue or ultraviolet light, and in addition to the created three primary colors of green, blue, and red, by mixing these three primary colors, light of various colors can be produced. It can be emitted.

Further, in the light source device 60, the first dichroic mirror 140 is movable by a rotation shaft provided at a predetermined position. Thereby, the incident angles of the first wavelength band light and the second wavelength band light can be set to the first incident angle θ1 and the second incident angle θ2, respectively, regardless of the reflection mirror.

In the above embodiment, the first dichroic mirror 140 reflects the first wavelength band light incident at the first incident angle θ1, which is set to 25 degrees, for example, and is set to, for example, 55 degrees, which is larger than the first incident angle. Although it is assumed that the second wavelength band light incident at the incident angle θ2 is transmitted, the present invention is not limited to this configuration. The first dichroic mirror 140 has a configuration that transmits the first wavelength band light incident at the first incident angle θ1 and reflects the second wavelength band light incident at the second incident angle θ2 larger than the first incident angle. Is also good.

Further, in the light source device 60, the position or the tilt angle of at least one of the first reflection mirror and the second reflection mirror can be adjusted. Thereby, the incident angle of the first wavelength band light and / or the second wavelength band light incident on the first dichroic mirror 140 can be adjusted and changed by various operations of the reflection mirror. Further, various operations of the reflection mirror are such that the light of all the blue laser diodes 71 constituting the first light source 710 is incident on the first dichroic mirror 140 at the first incident angle θ1 and reflected toward the phosphor 110. Therefore, the third wavelength band light emitted from the phosphor 110 can be used as brighter light. In addition, various operations of the reflection mirror are such that the light of all the blue laser diodes 71 constituting the second light source 720 can be incidented on the first dichroic mirror 140 at the second incident angle θ2 and transmitted. The light of the blue laser diode 71 can be used as blue.

With the above configuration, it is possible to obtain a light source device 60 that can be miniaturized with a simple configuration. Then, the light source device 60, the display element 50, the projection optical system 220, the projection device control unit, and the like can be used to obtain the projection device 10 that can be miniaturized.

It should be noted that each of the embodiments described above is presented as an example, and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and variations thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

The inventions described in the first claims of the present application are described below.
[1] A first light source that emits light in the first wavelength band,
A second light source that emits light in the second wavelength band,
A first dichroic mirror that reflects the first wavelength band light incident at the first incident angle and transmits the second wavelength band light incident at a second incident angle different from the first incident angle.
A second dichroic mirror that reflects the second wavelength band light that has passed through the first dichroic mirror, and a second dichroic mirror.
Equipped with
A light source device characterized in that the second wavelength band light is reflected by the second dichroic mirror, then incident on the first dichroic mirror at the first incident angle and reflected.
[2] The light source device according to the above [1], wherein the second incident angle is larger than the first incident angle.
[3] Further provided with a phosphor that uses the first wavelength band light as excitation light and emits third wavelength band light having a wavelength band different from that of the first wavelength band light and the second wavelength band light.
The first dichroic mirror transmits the third wavelength band light and transmits the third wavelength band light.
The first light source, the second light source, and the phosphor are provided on one surface side of the first dichroic mirror.
The light source device according to the above [1] or the above [2].
[4] The excitation light irradiated to the phosphor is the first wavelength band light reflected by the first dichroic mirror.
The light source device according to the above [3].
[5] A first reflection mirror on which a first reflection surface that reflects the first wavelength band light is formed, and a second reflection surface that reflects the second wavelength band light and is non-parallel to the first reflection surface. With a formed second reflective mirror,
Alternatively, the first light source and the second light source are arranged so as to be non-parallel to each other.
The light source device according to any one of the above [1] to the above [4].
[6] A λ / 2 wave plate is provided between either one of the first light source or the second light source and the first dichroic mirror.
The polarization direction of the first wavelength band light and the polarization direction of the second wavelength band light are orthogonal to each other with respect to the first dichroic mirror.
The light source device according to any one of the above [1] to the above [5].
[7] Any of the above [1] to the above [6], wherein the first wavelength band light and the second wavelength band light pass through a diffuser plate before being incident on the first dichroic mirror. The light source device described in.
[8] Further provided with a third light source that emits a fourth wavelength band light having a wavelength band different from that of the first wavelength band light to the third wavelength band light.
The second dichroic mirror transmits the fourth wavelength band light.
The light source device according to the above [4].
[9] The first dichroic mirror is
Reflecting the fourth wavelength band light transmitted through the second dichroic mirror,
The second wavelength band light to the fourth wavelength band light are combined in the same optical path.
The light source device according to the above [8].
[10] The first light source to the third light source are characterized in that the first wavelength band light, the second wavelength band light, and the fourth wavelength band light are emitted in a time-divided manner, respectively. [8] Or the light source device according to the above [9].
[11] The first wavelength band light is blue wavelength band light or ultraviolet light.
The second wavelength band light is blue wavelength band light, and is
The third wavelength band light is green wavelength band light.
The fourth wavelength band light is red wavelength band light.
The light source device according to any one of the above [8] to the above [10].
[12] The light source device according to any one of the above [1] to [11], wherein the first dichroic mirror is movable by a rotation shaft provided at a predetermined position.
[13] The light source device according to the above [5], wherein at least one of the first reflection mirror and the second reflection mirror can adjust the position or the tilt angle.
[14] The light source device according to any one of the above [1] to [13] and the light source device.
A display element that is irradiated with light from the light source from the light source device to form image light, and
A projection optical system that projects the image light emitted from the display element onto the projected object, and
A projection device control unit that controls the display element and the light source device,
A projection device characterized by having.

10 Projection device 12 Front panel 13 Back panel 14 Right panel 15 Left panel 21 I / O connector part 22 I / O interface 23 Image conversion part 24 Display encoder 25 Video RAM 26 Display drive part 31 Image compression / decompression part 32 Memory card 35 Ir reception Part 36 Ir processing part 37 Key / indicator part 38 Control part 41 Light source control circuit 43 Cooling fan drive control circuit 45 Lens motor 47 Sound processing part 48 Speaker 50 Display element 57 Power connector 60 Light source device 71 Blue laser diode 73 Collimeter lens 81 Heat sink 100 Green light source device 110 Fluorescent material 111 Condensing lens group 112 Condensing lens 113 Condensing lens 130 Heat pipe 140 1st dichroic mirror 141 2nd dichroic mirror 150 Heat source 170 Light source side optical system 173 Condensing lens 175 Light guide device 178 Optical lens 179 Condensing lens 185 Irradiation mirror 190 Heat sink 195 Condenser lens 220 Projection optical system 225 Fixed lens group 235 Movable lens group 242 Control circuit board 261 Cooling fan 300 Red light emitting diode 310 Third light source 311 Condensing lens group 312 Condensing lens 313 Condensing lens 380 Red light source device 700 Light source unit 701 Holding member 703 Diffusing plate 704 Diffusing plate 705 1st reflection mirror 706 2nd reflection mirror 710 1st light source 720 2nd light source 722 λ / 2 wavelength plate L1 1st wavelength band light L2 2nd wavelength band light L3 3rd wavelength band light L4 4th wavelength band light θ1 1st incident angle θ2 2nd incident angle C1 cut-on light source C2 cut-off light source W1 to W3 separable band P1 peak wavelength

Claims (14)

The first light source that emits the first wavelength band light and
A second light source that emits light in the second wavelength band,
A first dichroic mirror that reflects the first wavelength band light incident at the first incident angle and transmits the second wavelength band light incident at a second incident angle different from the first incident angle.
A second dichroic mirror that reflects the second wavelength band light that has passed through the first dichroic mirror, and a second dichroic mirror.
Equipped with
A light source device characterized in that the second wavelength band light is reflected by the second dichroic mirror, then incident on the first dichroic mirror at the first incident angle and reflected. The light source device according to claim 1, wherein the second incident angle is larger than the first incident angle. Further comprising a phosphor that uses the first wavelength band light as excitation light and emits third wavelength band light having a wavelength band different from that of the first wavelength band light and the second wavelength band light.
The first dichroic mirror transmits the third wavelength band light and transmits the third wavelength band light.
The first light source, the second light source, and the phosphor are provided on one surface side of the first dichroic mirror.
The light source device according to claim 1 or 2, wherein the light source device is characterized by the above. The excitation light irradiated to the phosphor is the first wavelength band light reflected by the first dichroic mirror.
The light source device according to claim 3. A first reflection mirror on which the first reflection surface for reflecting the first wavelength band light was formed, and a second reflection surface for reflecting the second wavelength band light and non-parallel to the first reflection surface were formed. With a second reflective mirror,
Alternatively, the first light source and the second light source are arranged so as to be non-parallel to each other.
The light source device according to any one of claims 1 to 4. A λ / 2 wave plate is provided between either one of the first light source or the second light source and the first dichroic mirror.
The polarization direction of the first wavelength band light and the polarization direction of the second wavelength band light are orthogonal to each other with respect to the first dichroic mirror.
The light source device according to any one of claims 1 to 5. The light source device according to any one of claims 1 to 6, wherein the first wavelength band light and the second wavelength band light pass through a diffuser plate before being incident on the first dichroic mirror. .. A third light source that emits a fourth wavelength band light having a wavelength band different from that of the first wavelength band light to the third wavelength band light is further provided.
The second dichroic mirror transmits the fourth wavelength band light.
The light source device according to claim 4. The first dichroic mirror is
Reflecting the fourth wavelength band light transmitted through the second dichroic mirror,
The second wavelength band light to the fourth wavelength band light are combined in the same optical path.
The light source device according to claim 8. 8. The light source device described in. The first wavelength band light is blue wavelength band light or ultraviolet light, and is
The second wavelength band light is blue wavelength band light, and is
The third wavelength band light is green wavelength band light.
The fourth wavelength band light is red wavelength band light.
The light source device according to any one of claims 8 to 10. The light source device according to any one of claims 1 to 11, wherein the first dichroic mirror is movable by a rotation shaft provided at a predetermined position. The light source device according to claim 5, wherein at least one of the first reflection mirror and the second reflection mirror can adjust the position or the tilt angle. The light source device according to any one of claims 1 to 13.
A display element that is irradiated with light from the light source from the light source device to form image light, and
A projection optical system that projects the image light emitted from the display element onto the projected object, and
A projection device control unit that controls the display element and the light source device,
A projection device characterized by having.

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