JP2023151746A - Light source device and projection device - Google Patents

Abstract

To provide a light source device capable of reducing size and a projection device having the light source device.SOLUTION: A light source device comprises: an excitation light irradiation device 70 emitting blue wavelength band light; a dichroic mirror part 201 through which the blue wavelength band light is transmitted and which reflects red wavelength band light; a fluorescent wheel device 100 disposed such that the blue wavelength band light having transmitted through the dichroic mirror part 201 is made incident at an angle inclined with respect to an incidence plane, which has a reflection region 102 reflecting the blue wavelength band light, and a red light emitting region emitting fluorescent light including the red wavelength band light by irradiation of the blue wavelength band light; and a reflection mirror part 202 reflecting at least the blue wavelength band light. The fluorescent wheel device 100 is disposed such that the blue wavelength band light reflected in the reflection region 102 is made incident into the reflection mirror part 202, and the red wavelength band light emitted in the red light emitting region is made incident into the dichroic mirror part 201 and the reflection mirror part 202.SELECTED DRAWING: Figure 9

Description

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

BACKGROUND OF THE INVENTION Today, projection devices are used to project personal computer screens, video screens, image data stored in memory cards, etc. onto screens. This projection device focuses light emitted from a light source onto a micromirror display element called a DMD (digital micromirror device) or a liquid crystal plate to display a color image on a screen.

For example, Patent Document 1 describes a laser diode that emits light in a blue wavelength band, two dichroic mirrors, a fluorescent wheel device that generates light in a yellow wavelength band that includes light in a green wavelength band and light in a red wavelength band, and a fluorescent wheel device that emits light in a yellow wavelength band, and A projection type image display device including a phosphor that generates band light is disclosed. A portion of the blue wavelength band light that has passed through the fluorescent wheel device passes through one dichroic mirror and enters the phosphor, and the rest is reflected by one dichroic mirror. The green wavelength band light generated in the phosphor by the blue wavelength band light and the blue wavelength band light reflected by one dichroic mirror are combined by the other dichroic mirror and guided to the display element side. Further, the light in the yellow wavelength band generated by the fluorescent wheel device is reflected by the other dichroic mirror and guided to the display element side.

JP2020-71307A

However, in the projection display device of Patent Document 1, the optical path of the blue wavelength band light reflected by one dichroic mirror is different from the optical path of the green wavelength band light and the yellow wavelength band light, so the blue wavelength band light is It is necessary to separately arrange a lens member, a mirror member, etc. for guiding light, making it difficult to downsize the device.

In view of the above points, an object of the present invention is to provide a light source device that can be downsized, and a projection device equipped with this light source device.

The light source device of the present invention includes a light source that emits light in a first wavelength band, a first mirror portion that transmits the light in the first wavelength band and reflects light in the second wavelength band, and a light source that transmits the light in the first wavelength band. a reflection region that is provided so that the first wavelength band light is incident on the incident surface at an oblique angle with respect to the incident surface, and that reflects the first wavelength band light; The fluorescent light emitting device includes a first light emitting region that emits fluorescence including band light, and a second mirror portion that reflects at least the first wavelength band light reflected by the reflection region, the fluorescent light emitting device comprising: The first wavelength band light reflected by the reflective area is incident on the second mirror section, and the second wavelength band light emitted from the first light emitting area is incident on the first mirror section and the second mirror section. It is set up to do so.

The projection device of the present invention includes the above-mentioned light source device, a display element that generates image light, a projection optical system that projects the image light emitted from the display element onto a projection object, the light source device, and the display device. and a control unit that controls the element.

According to the present invention, it is possible to provide a light source device that can be downsized, and a projection device that includes this light source device.

FIG. 3 is a diagram showing a functional circuit block of the projection device according to the embodiment. FIG. 2 is a schematic plan view showing the internal structure of the projection device according to the embodiment. FIG. 2 is a schematic plan view of a fluorescent wheel of a fluorescent wheel device according to an embodiment. FIG. 2 is a schematic plan view of a color wheel of a color wheel device according to an embodiment. FIG. 2 is a schematic plan view showing how blue wavelength band light and fluorescence are reflected in the fluorescent wheel device according to the embodiment. (a) is a schematic front view of the mirror member according to the embodiment in a state where it is not irradiated with blue wavelength band light, and (b) is a front view of the mirror member according to the embodiment in a state where it is irradiated with blue wavelength band light. It is a schematic diagram. (a) is a schematic diagram showing the long-axis component of the luminous flux of blue wavelength band light emitted from the excitation light irradiation device according to the embodiment, and (b) is a schematic diagram showing the long axis component of the luminous flux of blue wavelength band light emitted from the excitation light irradiation device according to the embodiment. FIG. 3 is a schematic diagram showing short-axis components of a luminous flux of wavelength band light. It is a graph showing the light distribution of blue wavelength band light emitted from the excitation light irradiation device according to the embodiment. FIG. 2 is a schematic plan view showing how the blue wavelength band transmitted through the mirror member and irradiated onto the fluorescent wheel in the embodiment is reflected by the fluorescent wheel device and the mirror member and transmitted through the color wheel device. FIG. 3 is a schematic plan view illustrating how fluorescence transmitted through a mirror member, irradiated onto a fluorescent wheel, and emitted by a fluorescent wheel device is reflected by a mirror member and transmitted through a color wheel device in an embodiment.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a functional circuit block diagram of the projection device 10. As shown in FIG. The projection device control section includes a CPU including an image conversion section 23 and a control section 38, a front end unit including an input/output interface 22, a display encoder 24, a display drive section 26, and the like. Image signals of various standards inputted from the input/output connector section 21 are converted by the image conversion section 23 via the input/output interface 22 and the system bus SB so as to be unified into image signals of a predetermined format suitable for display. Thereafter, it is output to the display encoder 24.

Further, 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 generated video signal to the display drive section 26.

The display drive unit 26 drives a display element 50 such as a DMD, which is a spatial light modulator (SOM), at an appropriate frame rate in response to the image signal output from the display encoder 24. The projection device 10 forms an optical image with the reflected light from the display device 50 by irradiating the display device 50 with a beam of light emitted from the light source device 60 via the light guide optical system 170, and forms an optical image with the light reflected from the display device 50. The image is projected and displayed on a projection object such as a screen (not shown) via the image forming apparatus (see FIG. 2). The movable lens group 235 of the projection optical system 220 can be driven by a lens motor 45 for zoom adjustment and focus adjustment.

Further, the image compression/expansion unit 31 performs a recording process of compressing the luminance signal and color difference signal of the image signal by processing such as ADCT and Huffman encoding, and sequentially writing the data into a memory card 32, which is a removable recording medium. Furthermore, the image compression/decompression section 31 reads out the image data recorded on the memory card 32 during the playback mode, decompresses each image data constituting a series of moving images frame by frame, and converts the image data via the image conversion section 23. It is output to the display encoder 24. Therefore, the image compression/expansion section 31 can output a moving image or the like based on the image data stored in the memory card 32.

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

The key/indicator section 37 includes a main key, an indicator, etc. provided on the housing. The operation signal of the key/indicator section 37 is sent directly to the control section 38. Further, a key operation signal from the remote controller is received by the Ir receiving section 35, demodulated into a code signal by the Ir processing section 36, and output to the control section 38.

The control section 38 is connected to the audio processing section 47 via the system bus SB. The audio processing unit 47 includes a sound source circuit such as a PCM sound source, converts the audio data into analog data in the projection mode and the playback mode, and drives the speaker 48 to amplify the sound.

The control unit 38 controls the light source control circuit 41. The light source control circuit 41 controls the excitation light irradiation device 70, the fluorescent wheel device 100, and the color wheel device 150 (see FIG. 2)) are individually controlled.

Furthermore, the control unit 38 causes the cooling fan drive control circuit 43 to detect the temperature using a plurality of temperature sensors provided in the light source device 60, etc., and controls the rotation speed of the cooling fan 261 (not shown) based on the result of this temperature detection. There is. In addition, the control unit 38 causes the cooling fan drive control circuit 43 to continue rotating the cooling fan 261 even after the power of the projection apparatus 10 main body is turned off using a timer or the like, or depending on the result of temperature detection by the temperature sensor, the projection apparatus 10 main body It also performs controls such as turning off the power.

Next, the internal structure of the projection device 10 will be explained. 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 an upper panel and a lower panel (not shown), a front panel 12 , a rear panel 13 , a right panel 14 , and a left panel 15 . Furthermore, the projection device 10 has a projection aperture 12a on the front side. In addition, in the following explanation, left and right in the projection device 10 refers to the left and right directions with respect to the projection direction from the projection aperture 12a, and front and rear refers to the side direction of the projecting object of the projection device 10 and the traveling direction of the light beam. Indicates the front and rear directions.

The projection device 10 includes a control circuit board 242 near the left panel 15. This control circuit board 242 includes a power supply circuit block, a light source control block, and the like. Furthermore, the projection device 10 includes a light source device 60 arranged approximately at the center of the projection device 10 . A power connector 57, a heat sink 130, a cooling fan 261, and the like are arranged between the light source device 60 and the right panel 14.

The light source device 60 includes an excitation light irradiation device (light source) 70 that is a light source of blue wavelength band light (first wavelength band light) and also a light source of excitation light, and red wavelength band light (second wavelength band light) and green wavelength band light. It includes a red-green light source device 80 that is a light source of wavelength band light (third wavelength band light). The red-green light source device 80 includes an excitation light irradiation device 70 and a fluorescent wheel device 100. The light source device 60 is provided with a light source optical system 140 that guides blue wavelength band light, red wavelength band light, and green wavelength band light.

The light source optical system 140 includes a fluorescent wheel device (fluorescent light emitting device) 100, a color wheel device (filter device) 150, a mirror member 200, and a first condenser lens 142. The light source optical system 140 focuses the light beams emitted from the excitation light irradiation device 70 and the red-green light source device 80 onto an incident surface of a microlens array 90, which will be described later. Further, the light source device 60 is provided with a light guiding optical system 170 that guides the light from the light source optical system 140 (light that has passed through the color wheel device 150) to a projection optical system 220, which will be described later.

The excitation light irradiation device 70 is arranged approximately at the center of the housing of the projection device 10. The excitation light irradiation device 70 has a plurality of blue laser diodes (light emitting section) 71 and a plurality of collimator lenses (lens section) 72. Each blue laser diode 71 and each collimator lens 72 are held by a holding member (not shown). The excitation light irradiation device 70 is connected to a heat sink 130 via a heat pipe so that it is cooled.

The blue laser diodes 71 constituting the light source group are semiconductor light emitting elements that emit blue wavelength band light as excitation light, and are arranged in a matrix of 2 rows and 2 columns (in the plan view of FIG. 2, etc., the row direction is (showing two blue laser diodes 71 arranged in the figure). The collimator lens 72 is arranged on the optical axis of each blue laser diode 71, and converts the emitted light from the blue laser diode 71 into parallel light so as to improve the directivity of the light. The blue wavelength band light emitted from each blue laser diode 71 becomes a luminous flux that is limited to a predetermined range by the collimator lens 72.

Here, with reference to FIGS. 7 and 8, the emission mode of the blue wavelength band light emitted from the excitation light irradiation device 70 will be described. The blue wavelength band light emitted from each blue laser diode 71 spreads into a substantially elliptical shape with a long axis component in the vertical direction (vertical direction) and a short axis component in the horizontal direction (horizontal direction). Of the luminous flux of the first wavelength band light emitted from each blue laser diode 71, FIG. 7(a) shows the spread of the long axis component, and FIG. 7(b) shows the spread of the short axis component. (See the solid line extending from the light emission point P).

As shown in FIGS. 7A and 7B, each collimator lens 72 is located at a position where the light emission point P of the corresponding blue laser diode 71 is slightly shifted from the axis C passing through the center of each collimator lens 72. It is provided. Thereby, the blue wavelength band light converted into parallel light by each collimator lens 72 is emitted from each collimator lens 72 in a state in which both the long axis component and the short axis component are slightly inclined.

FIG. 8 is a graph showing the light distribution of the blue wavelength band light emitted from the excitation light irradiation device 70, where the vertical axis shows the intensity of the light (numerical values and units are not shown), and the horizontal axis shows the spread angle of the light. It shows. In FIG. 8, the line indicated by the symbol A1 indicates the light distribution of the long axis component of the blue wavelength band light, and the line indicated by the symbol A2 indicates the light distribution of the short axis component of the blue wavelength band light. The blue wavelength band light emitted from the excitation light irradiation device 70 has a spread angle of 46.0° in 1/e ² width of the maximum intensity of the long axis component, and 1/e ² width of the maximum intensity of the short axis component. The spread angle at is 9.2°.

Returning to FIG. 2, the configuration of the fluorescent wheel device 100 will be described. The fluorescent wheel device 100 includes a fluorescent wheel 101 provided in a disk shape or an annular shape, a motor 110 that rotationally drives the fluorescent wheel 101, and a drive control device (not shown) that drives and controls the motor 110. There is. The drive control device is controlled by the light source control circuit 41 described above. The fluorescent wheel device 100 is arranged in such a manner that the surface side of the fluorescent wheel 101 (the side opposite to the side on which the motor 110 is arranged) on which the blue wavelength band light is incident is directed toward the mirror member 200 side, which will be described later.

The fluorescent wheel 101 shown in FIG. 3 is made of a metal material such as copper or aluminum, and its surface is mirror-finished by silver vapor deposition or the like. The fluorescent wheel 101 has a reflective region 102, a red light emitting region (first light emitting region) 104, and a green light emitting region (second light emitting region) 106. The reflective area 102, the red light emitting area 104, and the green light emitting area 106 are arranged in parallel in the circumferential direction of the fluorescent wheel 101, and in the example shown in FIG. 3, they are each arranged in an angular range of about 120 degrees. Note that the proportions occupied by each of the reflective region 102, the red light emitting region 104, and the green light emitting region 106 are not limited to the angular range of approximately 120 degrees, and may be changed as appropriate.

The reflective region 102 is provided in a flat shape and reflects light in the blue wavelength band. In the red light emitting region 104, a red phosphor layer is provided on a mirror-processed surface. The red light emitting region 104 receives the blue wavelength band light emitted from the excitation light irradiation device 70 as excitation light, and emits fluorescence including the red wavelength band light. The green light emitting region 106 receives the blue wavelength band light emitted from the excitation light irradiation device 70 as excitation light, and emits fluorescence including the green wavelength band light.

As shown in FIG. 5, the reflection angle α1 of the reflected light RE of the blue wavelength band light reflected by the reflection region 102 is about 5 to 10 degrees. Furthermore, the diffusion angle α2 of the red wavelength band light and the green wavelength band light LU emitted from the red light emitting region 104 and the green light emitting region 106 is about 120°, respectively. In this way, the red wavelength band light and the green wavelength band light are diffused from the surface of the fluorescent wheel 101 at a wider angle than the blue wavelength band light.

The color wheel device 150 includes a color wheel 151 provided in a disk shape or an annular shape, a motor 160 that drives the color wheel 151, and a drive control device (not shown) that drives and controls the motor 160. . The drive control device is controlled by the light source control circuit 41 described above. The color wheel device 150 is arranged in such a manner that the front side of the color wheel 151 (the side opposite to the side where the motor 160 is arranged) is directed toward the mirror member 200 side, which will be described later.

The color wheel 151 shown in FIG. 4 is made of a transparent material such as transparent glass or resin, and includes a blue transmission area (transmission area, transmission diffusion area) 152, a red transmission area (first filter area) 154, and a color wheel 151 shown in FIG. It has a green transmission area (second filter area) 156. The blue transmitting region 152, the red transmitting region 154, and the green transmitting region 156 are arranged in parallel in the circumferential direction of the color wheel 151, and in the example shown in FIG. 4, are each arranged in an angular range of about 120 degrees. Note that the proportions occupied by each of the blue transmitting region 152, the red transmitting region 154, and the green transmitting region 156 are not limited to the angular range of approximately 120 degrees, and may be changed as appropriate.

The blue transmission region 152 transmits and diffuses light in the blue wavelength band. The red transmission region 154 transmits light in the red wavelength band and reflects light in other wavelength bands. The green transmission region 156 transmits light in the green wavelength band and reflects light in other wavelength bands. The wavelength band of light transmitted through the red transmission region 154 is, for example, 590 to 650 nm. The wavelength band of light transmitted through the green transmission region 156 is, for example, 465 to 590 nm. Note that in this embodiment, the blue transmission region 152 transmits not only light in the blue wavelength band but also light in other wavelength bands that are considered visible light. For example, the blue transmission region 152 transmits light in the blue wavelength band and The wavelength band of light transmitted through the blue transmission area 152 may be from 440 to 465 nm.

As shown in FIGS. 5 and 6, the mirror member 200 is a horizontally elongated substantially rectangular plate-like member, and is provided between the excitation light irradiation device 70 and the fluorescent wheel device 100. Of the two plate surfaces of the mirror member 200, the surface facing the excitation light irradiation device 70 is the excitation light incidence surface 200a on which the blue wavelength band light emitted from the excitation light irradiation device 70 enters, and the surface on the opposite side The surface (the surface facing the fluorescent wheel device 100 side) is the excitation light emitting surface 200b from which the blue wavelength band light transmitted through the mirror member 200 is emitted.

The mirror member 200 has a dichroic mirror section (first mirror section) 201 and a reflective mirror section (second mirror section) 202. The dichroic mirror portions 201 are provided in two locations in the mirror member 200 in the form of slits (vertically elongated rectangular shapes) whose long sides are in the vertical direction (see FIG. 6(a)). A portion of the mirror member 200 excluding the dichroic mirror section 201 is a reflecting mirror section 202. As described above, in this embodiment, the dichroic mirror section 201 and the reflective mirror section 202 are provided in the same mirror member 200 in close proximity to each other.

The dichroic mirror section 201 has a dichroic mirror-processed surface, transmits blue wavelength band light, and reflects red wavelength band light and green wavelength band light. The reflecting mirror section 202 has a mirror-processed surface and reflects all visible wavelength band light including blue wavelength band light, red wavelength band light, and green wavelength band light. Blue wavelength band light emitted from each blue laser diode 71 enters the two dichroic mirror sections 201 .

Specifically, the dichroic mirror section 201 is provided in a slit shape whose long side direction is the long axis direction of the light beam R1 of the blue wavelength band light that is emitted from the excitation light irradiation device 70 and enters the dichroic mirror section 201. That is, as shown in FIG. 6(b), the dichroic mirror section 201 is provided so that the entire range of the light beam R1 of the blue wavelength band light, which spreads in a substantially elliptical shape with the long axis component in the vertical direction, is incident thereon. Specifically, the vertical direction (vertical direction) dimension of the dichroic mirror section 201 is such that the long axis component of the light beam R1 of the blue wavelength band incident on the dichroic mirror section 201 enters the dichroic mirror section 201. The lateral dimension of the portion 201 is such that the short axis component of the light flux R1 of the blue wavelength band light is incident on the dichroic mirror portion 201.

Note that in the mirror member 200, the dichroic mirror section 201 includes a group of blue laser diodes 71 arranged in a column direction (vertical direction, vertical direction) among the blue laser diodes 71 arranged in a matrix. It is provided so as to correspond to the section 201.

The first condensing lens 142 is provided between the mirror member 200 and the fluorescent wheel device 100. The first condensing lens 142 condenses the blue wavelength band light that has passed through the dichroic mirror section 201 of the mirror member 200 and guides it to the fluorescent wheel device 100 side. The first condensing lens 142 also collects the blue wavelength band light reflected by the reflection area 102 of the fluorescent wheel device 100, the red wavelength band light emitted from the red light emitting area 104 and the green light emitting area 106 of the fluorescent wheel device 100, and the green wavelength band light emitted from the red light emitting area 104 and the green light emitting area 106 of the fluorescent wheel device 100. The wavelength band light is focused and guided to the mirror member 200 side.

Next, the arrangement of each member constituting the light source device 60 will be described. As described above, the mirror member 200 is arranged so that the blue wavelength band light emitted from the excitation light irradiation device 70 enters the dichroic mirror section 201 and is transmitted therethrough. The fluorescent wheel device 100 is arranged so that the blue wavelength band light transmitted through the dichroic mirror section 201 is incident at an oblique angle to the wheel surface (incidence surface) of the fluorescent wheel. Further, in the fluorescent wheel device 100, the blue wavelength band light reflected by the fluorescent wheel 101 enters the reflection mirror unit 202, and the red wavelength band light and the green wavelength band light emitted by the fluorescent wheel 101 enter the dichroic mirror unit 201 and the reflection mirror. The light is provided in such a manner that the light enters the portion 202. The color wheel device 150 is arranged so that the blue wavelength band light, the red wavelength band light, and the green wavelength band light reflected by the mirror member 200 are incident thereon.

Returning to FIG. 2, the light guide optical system 170 includes a microlens array 90, a concave lens 174, a second condensing lens 175, an irradiation mirror 185, and a condenser lens 195. The concave lens 174 is arranged between the microlens array 90 and the second condensing lens 175. Note that the condenser lens 195 is also a part of the projection optical system 220 because it emits the image light emitted from the display element 50 disposed on the rear panel 13 side of the condenser lens 195 toward the projection optical system 220.

The projection optical system 220 includes a condenser lens 195, a movable lens group 235, and a fixed lens group 225. A fixed lens group 225 arranged on the optical axis of the condenser lens 195 on the front panel 12 side is housed in a fixed lens barrel and is moved manually or automatically to enable zoom adjustment and focus adjustment.

In the projection device 10 configured as described above, the control unit 38 controls the fluorescent wheel device 100 and the color wheel device 150 so that the emission period of the blue wavelength band light is adjusted to the position where the blue wavelength band light is incident. Control is performed so that the reflective area 102 of the fluorescent wheel device 100 is located and the blue transparent area 152 of the color wheel device 150 is located. Furthermore, during the emission period of the red wavelength band, the control unit 38 determines that the red light emitting region 104 of the fluorescent wheel device 100 is located at the position where the red wavelength band light is incident, and the red transmitting region 154 of the color wheel device 150 is located. Control as follows.

Further, during the emission period of the green wavelength band, the control unit 38 controls the green wavelength band light to be incident on the green light emitting region 106 of the fluorescent wheel device 100 and the color wheel device 150 to have the green light transmitting region 156 located at the position where the green wavelength band light is incident. Control as follows. As a result, each wavelength band light is incident on the display element 50 via the light guide optical system 170, and the display element 50 displays each color of light in a time-division manner according to the data, thereby projecting a color image on the screen. Can be done.

Next, the ingress and egress of light in each member constituting the light source device 60 will be explained. First, a case where blue wavelength band light, which is excitation light, is emitted will be described based on FIG. 9. Here, the position on the fluorescent wheel 101 where the blue wavelength band light (light L1 shown by the solid line in FIGS. 9 and 10) is incident is defined as the first irradiation spot SP1 (see FIG. 3), and the blue wavelength band light and the red wavelength band light are incident. The position on the color wheel 151 where the light and green wavelength band light are incident is defined as a second irradiation spot SP2 (see FIG. 4). In FIG. 9, the reflection area 102 of the fluorescent wheel 101 is located at the first irradiation spot SP1, and the blue transmission area 152 of the color wheel 151 is located at the second irradiation spot SP2.

The blue wavelength band light (excitation light) emitted from each blue laser diode 71 of the excitation light irradiation device 70 has a light beam R1 (see FIG. 5(b)) throughout the entire area of the dichroic mirror section 201 of the mirror member 200 at two locations. and are transmitted through the dichroic mirror section 201. The blue wavelength band light transmitted through the dichroic mirror section 201 enters the fluorescent wheel 101 at an inclined angle with respect to the incident surface via the first condenser lens 142 . When the reflection area 102 is located at the first irradiation spot SP1, the blue wavelength band light incident on the fluorescent wheel 101 is reflected at the reflection area 102 at an angle of about 5 to 10 degrees with respect to the incident angle. .

The blue wavelength band light reflected by the fluorescent wheel 101 enters the reflection mirror section 202 of the mirror member 200 via the first condenser lens 142. The blue wavelength band light incident on the reflection mirror section 202 is reflected toward the color wheel device 150 side, and is incident on the color wheel 151. When the blue transmission area 152 is located at the second irradiation spot SP2, the blue wavelength band light incident on the color wheel 151 is diffused by the blue transmission area 152 and passes through the blue transmission area 152. It is emitted towards. In this way, the excitation light in the blue wavelength band can be used as light source light.

Next, based on FIG. 10, a case where red wavelength band light and green wavelength band light are emitted will be described. In FIG. 10, the red light emitting region 104 is located at the first irradiation spot SP1, and the red transmitting region 154 is located at the second irradiation spot SP2. Alternatively, in FIG. 10, the green light emitting region 106 is located at the first irradiation spot SP1, and the green transmission region 156 is located at the second irradiation spot SP2. The optical path of the blue wavelength band light, which is the excitation light, until it enters the fluorescent wheel 101 is as described above. When the red light emitting region 104 is located in the first irradiation spot SP1, the blue wavelength band light incident on the fluorescent wheel 101 illuminates the red phosphor layer, and the green light emitting region 106 is located in the first irradiation spot SP1. When the phosphor wheel 101 is in the green phosphor layer, the blue wavelength band light incident on the phosphor wheel 101 illuminates the green phosphor layer.

When the red light emitting region 104 is irradiated with blue wavelength band light, which is excitation light, fluorescence (light L2 shown by a broken line in FIG. 10) including red wavelength band light is emitted. Furthermore, when the green light emitting region 106 is irradiated with light in the blue wavelength band, fluorescence (light L2 indicated by a broken line in FIG. 10) including the light in the green wavelength band is emitted. Here, the light emitted by the red light emitting region 104 and the green light emitting region 106 includes fluorescence including red wavelength band light, fluorescence including green wavelength band light, and light emitted by the red light emitting region 104 or the green light emitting region 106. Excitation light reflected by the mirror-finished surface of the fluorescent wheel 101 (hereinafter referred to as "residual excitation light") remains.

The red wavelength band light emitted from the red light emitting region 104 and the green wavelength band light emitted from the green light emitting region 106 are diffused at an angle of about 120° and go to the mirror member 200 side via the first condensing lens 142. It is emitted. Most of the red wavelength band light and green wavelength band light emitted to the mirror member 200 side enters the dichroic mirror section 201 of the mirror member 200, the remainder enters the reflecting mirror section 202, and the remaining portion enters the dichroic mirror section 201 and the dichroic mirror section 201. The light is reflected by the reflective mirror section 202 toward the color wheel device 150 and enters the color wheel 151 .

When the red transmission area 154 is located in the second irradiation spot SP2, the red wavelength band light incident on the color wheel 151 is transmitted through the red transmission area 154, has increased color purity, and is directed toward the microlens array 90. It is emitted. Furthermore, when the green transmission area 156 is located in the second irradiation spot SP2, the green wavelength band light incident on the color wheel 151 is transmitted through the green transmission area 156, has increased color purity, and is transmitted to the microlens array 90. It is emitted towards the target. In this way, red wavelength band light and green wavelength band light can be used as light source light.

Note that the residual excitation light reflected by the fluorescent wheel 101 is emitted to the mirror member 200 side via the first condensing lens 142 and enters either the dichroic mirror section 201 or the reflective mirror section 202 of the mirror member 200. . Of this, residual excitation light that has entered the dichroic mirror section 201 is transmitted through the dichroic mirror section 201 and removed. On the other hand, the residual excitation light that has entered the reflective mirror section 202 is reflected by the reflective mirror section 202 toward the color wheel device 150 side and enters the red transmitting region 154 or the green transmitting region 156 of the color wheel 151 . The residual excitation light incident on the red transmission area 154 or the green transmission area 156 is reflected by the red transmission area 154 or the green transmission area 156 and removed.

In this embodiment, a configuration in which the fluorescent wheel device 100 is provided with the red light emitting region 104 and the green light emitting region 106 is illustrated, but the fluorescent wheel device 100 includes a yellow light emitting body that emits fluorescence including yellow wavelength band light. A structure including layers may also be used. In this case, the blue wavelength band light, which is excitation light, is irradiated onto the yellow light emitter layer to emit yellow wavelength band light, and the emitted yellow wavelength band light is passed through the dichroic mirror section 201 and the reflection mirror section 202 to the color wheel device 150 side. reflected to. When the red wavelength band light incident on the color wheel 151 is located in the red transmission area 154 at the second irradiation spot SP2, the red wavelength band light is transmitted through the red transmission area 154 and the other green wavelength band light is reflected. When the green wavelength band light is located at the second irradiation spot SP2, the green wavelength band light is transmitted through the green wavelength band light and the other red wavelength band light is reflected and removed.

As described above, the light source device 60 according to the present embodiment includes the excitation light irradiation device 70 that emits light in the blue wavelength band, the dichroic mirror section 201 that transmits the light in the blue wavelength band and reflects the light in the red wavelength band, The blue wavelength band light transmitted through the dichroic mirror section 201 is provided so as to be incident at an oblique angle with respect to the incident surface, and there is a reflection area 102 that reflects the blue wavelength band light, and a reflection area 102 that is irradiated with the blue wavelength band light to reflect the red wavelength band light. It includes a fluorescent wheel device 100 having a red light emitting region 104 that emits fluorescent light including band light, and a reflecting mirror section 202 that reflects at least blue wavelength band light. In the fluorescent wheel device 100, the blue wavelength band light reflected by the reflection region 102 enters the reflection mirror section 202, and the red wavelength band light emitted from the red light emitting region 104 enters the dichroic mirror section 201 and the reflection mirror section 202. It is set up to do so.

Since the light source device 60 is configured as described above, the blue wavelength band light reflected by the fluorescent wheel device 100 and the red wavelength band light emitted by the fluorescent wheel device 100 are guided to the same side. Of the red wavelength band light incident on the dichroic mirror section 201 and the reflecting mirror section 202, at least the red wavelength band light incident on the dichroic mirror section 201 is reflected to the same side as the blue wavelength band light incident on the reflecting mirror section 202. Ru. As a result, the optical paths of the blue wavelength band light and the red wavelength band light become the same optical path, so lens members, mirror members, etc. are separately arranged to guide the light of one wavelength band independently from the light of the other wavelength band. There's no need to. Therefore, the light source device 60 can be made smaller.

The light source device 60 also includes a fluorescent wheel device 100 as a fluorescent light emitting device. This makes it possible to provide a specific configuration for controlling the fluorescent wheel device 100 so that either the reflective region 102 or the red light emitting region 104 is located in a time-sharing manner at a position where blue wavelength band light is incident. . Further, it is possible to suppress heat caused by irradiation with excitation light from concentrating on a part of the phosphor layer provided in the phosphor wheel device 100.

Further, in the light source device 60, the dichroic mirror section 201 and the reflective mirror section 202 are provided on the same mirror member 200. This makes it possible to provide a specific configuration for providing the dichroic mirror section 201 and the reflecting mirror section 202 close to each other.

Further, in the light source device 60, the dichroic mirror section 201 is provided in the shape of a slit in the mirror member 200, and the entire portion of the mirror member 200 except for the dichroic mirror section 201 is a reflecting mirror section 202. This makes it possible to narrow the area of the dichroic mirror section 201 and widen the area of the reflective mirror section 202 in the mirror member 200. Therefore, most of the blue wavelength band light reflected by the fluorescent wheel device 100 can be reflected by the reflecting mirror section 202, and the blue wavelength band light reflected by the fluorescent wheel device 100 can enter the dichroic mirror section 201. , energy loss due to transmission through the dichroic mirror section 201 can be reduced.

Furthermore, in the light source device 60, the dichroic mirror section 201 has a slit shape whose long side direction is the long axis direction of the light beam of the blue wavelength band light that is emitted from the excitation light irradiation device 70 and enters the dichroic mirror section 201. There is. Thereby, the entire range of the light beam R1 of the blue wavelength band light emitted from the excitation light irradiation device 70 to the dichroic mirror section 201 side can be made incident on the dichroic mirror section 201. Therefore, a part or all of the blue wavelength band light emitted from the excitation light irradiation device 70 may lose energy due to being removed from the dichroic mirror section 201, or may be energy loss due to entering the reflecting mirror section 202 and being reflected. can be reduced.

In the light source device 60, the excitation light irradiation device 70 is a laser diode, and includes a blue laser diode 71 that emits light, and a blue laser diode 71 that is provided on the light output side of the blue laser diode 71 to emit blue light emitted from the blue laser diode 71. It has a collimator lens 72 that converts wavelength band light into a parallel beam of light. As a result, the light beam R1 of the blue wavelength band light emitted from the blue laser diode 71 is converged, thereby providing a specific configuration for making the entire range of the light beam R1 of the blue wavelength band incident on the dichroic mirror unit 201. be able to.

Further, in the light source device 60, the collimator lens 72 is provided so that the light emission point P of the blue laser diode 71 is shifted from the axis C passing through the center of the collimator lens 72. Thereby, the blue wavelength band light emitted from the collimator lens 72 can be adjusted to be tilted in any direction, and the blue wavelength band light emitted from the blue laser diode 71 can be effectively directed to the dichroic mirror unit 201. It can be made incident.

Further, in the light source device 60, the excitation light irradiation device 70 includes a plurality of blue laser diodes 71 and a plurality of dichroic mirror sections 201. As a result, the irradiation intensity in the excitation light irradiation device 70 can be increased, and each dichroic mirror section 201 can be provided in a manner corresponding to one or a group of blue laser diodes 71 among the plurality of blue laser diodes 71. I can do it.

In addition, in the light source device 60, the fluorescent wheel device 100 has a green light emitting region 106 that emits fluorescence including green wavelength band light when irradiated with blue wavelength band light, and the green light emitting region 106 emits the green wavelength band light in a dichroic manner. Light is emitted toward the mirror section 201 and reflective mirror section 202 sides. Thereby, the optical path of the light in the green wavelength band can be made the same optical path as the light in the blue wavelength band and the light in the red wavelength band, and it is possible to increase the display colors of the light source device 60 and reduce the size of the device.

Further, in the light source device 60, the reflection mirror section 202 is provided close to the dichroic mirror section 201, and reflects the red wavelength band light emitted from the red light emitting region 104 and the green wavelength band light emitted from the green light emitting region 106. . As a result, out of the red wavelength band light and the green wavelength band light emitted by the fluorescent wheel device 100, not only the light incident on the dichroic mirror section 201 but also the light incident on the reflecting mirror section 202 enters the reflecting mirror section 202. It is reflected to the same side as the blue wavelength band light. Therefore, the optical paths of the red wavelength band light and the green wavelength band light can be made more effectively the same optical path as the optical path of the blue wavelength band light.

The light source device 60 also includes a blue transmission region 152 that transmits light in the blue wavelength band, a red transmission region 154 that transmits light in the red wavelength band and reflects light in other wavelength bands, and a red transmission region 154 that transmits light in the green wavelength band and reflects light in other wavelength bands. The color wheel device 150 is provided with a color wheel device 150 having a green transmission region 156 that reflects light in a wavelength band of . As a result, the color purity of the red wavelength band light that passes through the red transmission region 154 and the green wavelength band light that passes through the green transmission region 156 can be increased, and the color purity of the blue wavelength band light that passes through the color wheel device 150 and the red wavelength band light that passes through the color wheel device 150 can be increased. Band light and green wavelength band light can be guided along the same optical path.

The light source device 60 also includes a color wheel device 150 as a filter device. As a result, in the color wheel device 150, the corresponding blue transmission area 152, red transmission area 154, and green transmission area 156 are time-divided at the positions where the blue wavelength band light, the red wavelength band light, and the green wavelength band light are incident. A specific configuration for controlling the position can be provided.

Furthermore, in the light source device 60, the color wheel device 150 has a blue transmission region 152 that transmits and diffuses blue wavelength band light as a transmission region. Thereby, the blue wavelength band light transmitted through the blue transmission region 152 can be made into a luminous flux having approximately the same size as the red wavelength band light and the green wavelength band light.

Furthermore, the projection device 10 according to the present embodiment includes the above-described light source device 60, a display element 50 that generates image light, and a projection optical system 220 that projects the image light emitted from the display element 50 onto an object to be projected. , a control unit 38 that controls the light source device 60 and the display element 50. As a result, the optical paths of the blue wavelength band light, red wavelength band light, and green wavelength band light guided from the light source device 60 to the projection optical system 220 side can be made into the same optical path, and the light source device 60 can be miniaturized. A projection device 10 can be realized.

Each embodiment 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 forms, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

For example, in the above embodiment, the dichroic mirror section and the reflective mirror section are provided on the same mirror member, but the dichroic mirror section and the reflective mirror section may be provided on different members. . Further, in the above embodiment, the configuration in which the dichroic mirror portion is provided at two locations in the mirror member is illustrated, but the configuration may be such that the dichroic mirror portion is provided in one location in the mirror member, or the dichroic mirror portion may be provided in one location in the mirror member. The configuration may be such that the portions are provided at three or more locations.

Below, the invention described in the first claim of the present application will be added.
[1] A light source that emits light in a first wavelength band;
a first mirror portion that transmits the first wavelength band light and reflects the second wavelength band light;
a reflection region that is provided so that the first wavelength band light transmitted through the first mirror section is incident at an oblique angle with respect to an incident plane and reflects the first wavelength band light; and a reflection region that reflects the first wavelength band light; a fluorescent light emitting device having a first light emitting region that emits fluorescence including the second wavelength band light upon being irradiated with the fluorescent light;
a second mirror portion that reflects at least the first wavelength band light reflected by the reflection region;
In the fluorescent light emitting device, the first wavelength band light reflected by the reflection region enters the second mirror section, and the second wavelength band light emitted from the first light emitting region enters the first mirror section and the second wavelength band light. provided so as to be incident on the second mirror section,
Light source device.
[2] The light source device according to [1], wherein the fluorescent light emitting device is a fluorescent wheel device.
[3] The light source device according to [2], wherein the first mirror portion and the second mirror portion are provided on the same mirror member.
[4] The first mirror portion is provided in a slit shape in the mirror member,
The entire portion of the mirror member excluding the first mirror portion is the second mirror portion.
The light source device according to [3] above.
[5] The first mirror section has a slit shape whose long side direction is the long axis direction of the luminous flux of the first wavelength band light that is emitted from the light source and enters the first mirror section. The light source device according to [4].
[6] The light source is a laser diode, and is provided with a light emitting part that emits light, and a light emitting side of the light emitting part, and converts the first wavelength band light emitted from the light emitting part into parallel light. The light source device according to [5] above, which has a lens section that converts the light beam into a light beam of .
[7] The light source device according to [6], wherein the lens portion is provided such that the light emission point of the light emission portion is shifted from an axis passing through the center of the lens portion.
[8] A plurality of the light emitting parts;
a plurality of the first mirror sections;
The light source device according to [7] above.
[9] The fluorescent light emitting device has a second light emitting region that is irradiated with the first wavelength band light and emits fluorescence including the third wavelength band light, and the second light emitting region emits the third wavelength band light. The light source device according to any one of [1] to [8], wherein the light source device emits light toward the first mirror portion and the second mirror portion.
[10]
The second mirror section is provided close to the first mirror section, and reflects the second wavelength band light emitted from the first light emitting region and the third wavelength band light emitted from the second light emitting region. The light source device according to [9] above.
[11]
a transmission area that transmits the first wavelength band light, a first filter area that transmits the second wavelength band light and reflects other wavelength band light, and a first filter area that transmits the third wavelength band light and reflects other wavelength band light. a filter device having a second filter region that reflects light;
The filter device is provided so that the light reflected by the second mirror section is incident thereon.
The light source device according to [10] above.
[12] The light source device according to [11], wherein the filter device is a color wheel device.
[13] The light source device according to [12], wherein the transmission region of the color wheel device is a transmission diffusion region that transmits and diffuses the first wavelength band light.
[14] The light source device according to [13] above,
a display element that generates image light;
a projection optical system that projects the image light emitted from the display element onto a projection object;
comprising a control unit that controls the light source device and the display element;
Projection device.

10 Projection device 12 Front panel 12a Projection port 13 Back panel 14 Right panel 15 Left panel 21 Input/output connector section 22 Input/output interface 23 Image converter 24 Display encoder 25 Video RAM 26 Display drive section 31 Image compression/expansion section 32 Memory card 35 Ir receiving section 36 Ir processing section 37 Key/indicator section 38 Control section 41 Light source control circuit 43 Cooling fan drive control circuit 45 Lens motor 47 Audio processing section 48 Speaker 50 Display element 57 Power connector 60 Light source device 70 Excitation light irradiation device 71 Blue laser diode 72 Collimator lens 80 Red-green light source device 90 Microlens array 100 Fluorescent wheel device 101 Fluorescent wheel 102 Reflective region 104 Red light emitting region 106 Green light emitting region 110 Motor 130 Heat sink 140 Light source optical system 142 First condensing lens 150 Color wheel Apparatus 151 Color wheel 152 Blue transmission area 154 Red transmission area 156 Green transmission area 160 Motor 170 Light guide optical system 174 Concave lens 175 Second condensing lens 185 Irradiation mirror 195 Condenser lens 200 Mirror member 200a Excitation light incident surface 200b Excitation light exit surface 201 Dichroic mirror unit 202 Reflection mirror unit 220 Projection optical system 225 Fixed lens group 235 Movable lens group 242 Control circuit board 261 Cooling fan C Axis L1, L2 Light LU Emitted light P Light output point R1 Luminous flux RE Reflected light SB System bus SP1 No. 1 irradiation spot SP2 2nd irradiation spot α1 Reflection angle α2 Diffusion angle

Claims (14)

a light source that emits light in a first wavelength band;
a first mirror portion that transmits the first wavelength band light and reflects the second wavelength band light;
a reflection region that is provided so that the first wavelength band light transmitted through the first mirror section is incident at an oblique angle with respect to an incident plane and reflects the first wavelength band light; and a reflection region that reflects the first wavelength band light; a fluorescent light emitting device having a first light emitting region that emits fluorescence including the second wavelength band light upon being irradiated with the fluorescent light;
a second mirror portion that reflects at least the first wavelength band light reflected by the reflection region;
In the fluorescent light emitting device, the first wavelength band light reflected by the reflection region enters the second mirror section, and the second wavelength band light emitted from the first light emitting region enters the first mirror section and the second wavelength band light. provided so as to be incident on the second mirror section,
Light source device. The light source device according to claim 1, wherein the fluorescent light emitting device is a fluorescent wheel device. The light source device according to claim 2, wherein the first mirror section and the second mirror section are provided on the same mirror member. The first mirror portion is provided in a slit shape in the mirror member,
The entire portion of the mirror member excluding the first mirror portion is the second mirror portion.
The light source device according to claim 3. According to claim 4, the first mirror section has a slit shape whose long side direction is the long axis direction of the luminous flux of the first wavelength band light that is emitted from the light source and enters the first mirror section. The light source device described. The light source is a laser diode, and includes a light emitting part that emits light, and is provided on the light emitting side of the light emitting part to convert the first wavelength band light emitted from the light emitting part into a parallel beam of light. The light source device according to claim 5, comprising a converting lens section. 7. The light source device according to claim 6, wherein the lens portion is provided such that a light emitting point of the light emitting portion is shifted from an axis passing through the center of the lens portion. a plurality of the light emitting parts;
a plurality of the first mirror sections;
The light source device according to claim 7. The fluorescent light emitting device has a second light emitting region that is irradiated with the first wavelength band light and emits fluorescence including the third wavelength band light, and the second light emitting region emits the third wavelength band light. The light source device according to claim 1, wherein the light source device emits light toward the first mirror section and the second mirror section. The second mirror section is provided close to the first mirror section, and reflects the second wavelength band light emitted from the first light emitting region and the third wavelength band light emitted from the second light emitting region. The light source device according to claim 9. a transmission area that transmits the first wavelength band light, a first filter area that transmits the second wavelength band light and reflects other wavelength band light, and a first filter area that transmits the third wavelength band light and reflects other wavelength band light. a filter device having a second filter region that reflects light;
The filter device is provided so that the light reflected by the second mirror section is incident thereon.
The light source device according to claim 10. The light source device according to claim 11, wherein the filter device is a color wheel device. The light source device according to claim 12, wherein the transmission region of the color wheel device is a transmission diffusion region that transmits and diffuses the first wavelength band light. The light source device according to claim 13;
a display element that generates image light;
a projection optical system that projects the image light emitted from the display element onto a projection object;
comprising a control unit that controls the light source device and the display element;
Projection device.

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