JP7121916B2 - projection device - Google Patents

Description

The present invention relates to projection devices.

Conventionally, there has been a technology for cooling the light sources and control substrates of projectors that project images formed using micromirror display elements called DMDs (digital micromirror devices) or liquid crystal plates onto a screen. Proposed. For example, the projection apparatus disclosed in Patent Document 1 has a partition section that partitions a first area having an optical unit including a light source and a transmissive liquid crystal plate and a second area having a power source and a control board. is provided with a cooling fan, and external air is sucked through the dust filter. The second area has a lower dust resistance than the first area, thereby improving the cooling efficiency of the second area.

JP 2016-80957 A

When the projection device is desired to have a compact shape, a plurality of heat-generating members inside the case of the projection device are densely packed. As a result, even if an attempt is made to divide the interior of the compact case into areas by means of a partition as in the conventional case, there is no space for the partition, or the partition itself has a complicated shape. It may be difficult to divide into areas where If one cooling fan is used to cool the first area and the second area in order to reduce the size of the projection apparatus, it may be difficult to sufficiently cool the entire internal parts of the case of the projection apparatus.

SUMMARY OF THE INVENTION It is an object of the present invention to cool a projection apparatus well with a single cooling fan.

The projection apparatus of the present invention comprises an optical device, a control circuit board arranged above the optical device, and a top air intake arranged near the rear air intake portion of the case on the opposite side to the projection direction and sucking air from the upper surface. a cooling fan having an opening and a lower surface intake port for sucking air from the lower surface; and a heat sink provided corresponding to the discharge port of the cooling fan and connected to the optical device, wherein the lower surface intake port side is smaller than the flow path resistance on the side of the upper intake port.

According to the present invention, the projection apparatus can be well cooled with one cooling fan.

1 is a front side perspective view showing the appearance of a projection device according to an embodiment of the present invention; FIG. 1 is a rear perspective view showing the appearance of a projection device according to an embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS The projection apparatus which concerns on embodiment of this invention is shown, (a) is an exploded perspective view seen from the upper direction, (b) is an exploded perspective view seen from the downward direction. FIG. 3 is an exploded perspective view of the optical device in the projection device according to the embodiment of the present invention, viewed from below; FIG. 4A is a top view and FIG. 4B is a bottom view showing a cooling fan in the projection apparatus according to the embodiment of the present invention; 2 is a cross-sectional view taken along the line VI-VI of FIG. 1, omitting the inside of the optical case of the projection apparatus according to the embodiment of the present invention and showing it with shading; FIG. Fig. 3 is a perspective view showing a heat sink for an IC chip on a substrate in a projection device according to an embodiment of the invention; FIG. 2 is a cross-sectional view taken along line VIII-VIII of FIG. 1, omitting the inside of the optical case in the projection apparatus according to the embodiment of the present invention, shown by shading; FIG. 2 is a cross-sectional view taken along line IX-IX of FIG. 1, omitting the inside of the optical case in the projection apparatus according to the embodiment of the present invention and showing it with shading; 3 is a diagram showing functional circuit blocks of the projection device according to the embodiment of the present invention; FIG. 1 is a schematic plan view showing the internal structure of a projection device according to an embodiment of the present invention; FIG. FIG. 4 is a schematic plan view showing the flow of cooling air in the projection device according to the embodiment of the present invention; 12 is a cross-sectional view taken along line XIII-XIII of FIG. 11 showing the case and power circuit board of the projection device according to the embodiment of the present invention; FIG.

A mode for carrying out the present invention will be described below. As shown in FIGS. 1 and 2, the projection device 10 has a compact shape, and has six outer peripheral surfaces (an upper surface 250a, a lower surface 250b, a left side 250c (second side), and a right side 250d). (first side surface), front surface 250e, rear surface 250f) (the first side surface and the second side surface are opposed to each other), and a case 250 having a substantially long rectangular box shape with the left-right direction as the longitudinal direction. . The projection device 10 has a projection aperture 11 on the front surface 250e side. The projection device 10 emits projection light from a projection aperture 11 . In the following description, left and right in the projection device 10 refer to the left and right direction with respect to the projection direction from the projection aperture 11, and front and rear refer to the front and rear direction with respect to the traveling direction of the projection light of the projection device 10. show.

The case 250 has an upper case 251 , a lower case 252 , a left panel 253 , a front panel 254 and a rear panel 255 . The upper case 251, as also shown in FIGS. 3A and 3B, has an upper panel portion 251a having an upper surface 250a and an upper right panel portion 251b having a surface forming a part of the upper side of the right side surface 250d. . The lower case 252 has a lower panel portion 252a with a lower surface 250b and a lower right panel portion 252b with a surface forming a portion of the lower side of the right side surface 250d. A connecting portion between the upper panel portion 251a and the upper right panel portion 251b and a connecting portion between the lower panel portion 252a and the lower right panel portion 252b are curved in an R shape. The left panel 253, the front panel 254, and the rear panel 255, together with the upper panel portion 251a and upper right panel portion 251b of the upper case 251 and the lower panel portion 252a and lower right panel portion 252b of the lower case 252, form a peripheral plate.

A power plug 15 is provided on the lower rear side of the right side surface 250d (the rear side of the lower right panel portion 252b). The lower case 252 is manufactured by die casting using a metal material such as magnesium alloy or aluminum alloy. The upper case 251 and the front, rear, and left panels are molded from a resin material.

A projection image adjustment unit 12 having one or more rotary knobs is provided on the upper surface of the upper case 251 at a portion corresponding to the projection aperture 11 . By operating the rotation knob of the projection image adjustment unit 12, the position of the working lens of the projection optical system is adjusted, and the size and focus of the projection image are adjusted. A key/indicator portion 37 is provided on the upper surface of the rear side of the upper case 251 . The key/indicator unit 37 includes a power switch key, a power indicator for notifying ON/OFF of power, a projection switch key for switching ON/OFF of projection, an optical device 60, a display element 51 (described later in FIG. 11), or a control circuit. Keys and indicators for performing various settings such as an overheat indicator that notifies the user when the heat is overheated are arranged.

A front panel 254 elongated in the left-right direction extends to a front left corner portion 250g of the case 250, and the front left corner portion 250g is rounded. Similarly, the rear panel 255, which is long in the left-right direction, extends to the left rear corner 250h of the case 250, and the left rear corner 250h is rounded. The left panel 253 is provided between a front panel 254 extending to the left front corner 250g and a rear panel 255 extending to the left rear corner 250h.

A horizontal rib 256 is provided across the left panel 253, the front panel 254, and the rear panel 255 at substantially the center in the vertical direction. The upper and lower sides of the horizontal ribs 256 in each panel are formed in a substantially horizontally long lattice shape. The left panel 253 , the front panel 254 , and the rear panel 255 have the horizontal rib 256 as the top, and the upper and lower sides of the horizontal rib 256 are inclined toward the inside of the case 250 .

An air intake section 261 having a plurality of narrow, horizontally long air intake holes is provided in a region extending from the substantially central portion of the left panel 253 to the rear side in a horizontally long lattice pattern. The intake portion 261 is provided with a plurality of thin, horizontally long intake holes along a substantially horizontally long lattice. On the front side of the left panel 253, there is provided a speaker section 48a having a horizontally elongated lattice shape and a part of which is opened. A speaker 48 is provided inside the speaker section 48a. An input/output connector section 21 for image signals is provided on the rear side of the left panel 253 .

The front panel 254 has an exhaust section 260 in a predetermined area on the right end side and an intake section 262 in a predetermined area in the substantially central portion. The intake section 262 includes a right intake section 262a and a left intake section 262b. The front panel 254 has a projection aperture opening 254a facing the projection aperture 11 near the left front corner 250g. A right front corner portion 250i where the front panel 254 is connected to the upper right panel portion 251b and the lower right panel portion 252b of the right side surface 250d is rectangular in plan view.

The exhaust part 260 is provided with inclined ribs 254b on the upper and lower sides in the radial direction from the right end of the horizontal rib 256, respectively. Further, the exhaust portion 260 is provided with two vertical ribs 254c above and below the horizontal rib 256 at a predetermined interval closer to the center than the inclined rib 254b. The exhaust portion 260 is provided with two horizontally elongated substantially U-shaped U-shaped ribs 254d extending over the inclined ribs 254b and the vertical ribs 254c. The exhaust part 260 has a larger opening than the intake parts 261 , 262 , 263 , 264 .

As shown in FIG. 11, the inclined rib 254b and the vertical rib 254c are inclined so that the exhaust direction is rightward. A region of the front panel 254 other than the exhaust portion 260 and the projection port opening 254a has a substantially horizontally long lattice shape.

The rear panel 255 is provided with an output plug 14 for audio equipment on the upper left side. The right end side of the rear panel 255 has a substantially U-shaped lattice that follows the horizontally elongated lattice shape of the other portion. From the left side of the rear panel 255 to approximately the central portion, an air intake portion 263 having thin, horizontally long air intake holes in a horizontally long lattice shape is provided. The right side portion of the rear panel 255 is similarly provided with an air intake section 264 (rear air intake section) having air intake holes (thin, horizontally long air intake holes and thin, substantially U-shaped air intake holes). A right rear corner portion 250j where the rear panel 255 is connected to the upper right panel portion 251b and the lower right panel portion 252b of the right side surface 250d is rectangular in plan view.

In this manner, the projection apparatus 10 is provided with intake/exhaust units including the intake units 261 to 264 having a plurality of intake holes and exhaust holes and the exhaust unit 260 . In other words, the air intake/exhaust unit of the projection device 10 has a plurality of air intake/exhaust holes.

Next, a storage form of the case 250 of the projection device 10 will be described. As shown in FIGS. 3A and 3B, the case 250 of the projection device 10 accommodates the optical case 61, the control circuit board 300, the cooling fan 280, the first heat sink 281, and the second heat sink 282. FIG. In the optical case 61, optical members such as various light sources, lenses, and mirrors of the optical device 60 are arranged, and the lens barrel 225 is attached.

As shown in FIGS. 3B and 4, the optical case 61 is provided with an opening 61a on the lower side (the side of the lower surface 250b of the case 250, the lower side in the thickness direction of the case 250). A cover member 62 is fixed to the opening 61a with a plurality of bolts together with a sealing member (not shown) for dust prevention. The sealing member is arranged along the edge of the opening 61a. The opening 61a is covered with a cover member 62, and the inside of the optical case 61 is a closed space. When manufacturing the optical device 60, optical members such as lenses and mirrors and light sources are mounted inside the optical case 61 through the opening 61a. Here, FIG. 4 shows an exploded perspective view from below, omitting optical members such as a condenser lens housed inside the optical case 61 .

A portion of the later-described fluorescent plate device 100 protrudes through an opening on the upper surface of the optical case 61 and is covered with a cover 65 . The attachment range of the cover 65 is limited compared to the cover member 62, and the attachment range is small. Therefore, the opening covered by the cover 65 can be easily dust-proofed with a sealing member or the like.

As shown in FIG. 3A, a control circuit board 300 serving as a main board is provided on the upper surface side of the optical case 61 . The control circuit board 300 is fixed to the upper side of the case 250 by screwing to bosses and brackets erected from the upper surface of the optical case 61 and the inner surface of the lower panel portion 252a of the lower case 252. . As shown in FIG. 11, a blower-type cooling fan 280 using a sirocco fan is installed on the rear right side of the optical case 61 (in other words, in the vicinity of the intake portion 264 of the case 250 on the side opposite to the projection direction). placed. The projection device 10 is provided with only one cooling fan 280 and is not provided with a plurality of fans.

The upper surface of the cooling fan 280 is provided with an upper surface intake port 280a for sucking air from the upper surface of the cooling fan 280, as shown in FIG. 5(a). The upper air intake port 280a consists of three substantially arcuate openings. On the other hand, the lower surface of the cooling fan 280 is provided with a lower surface intake port 280b. The bottom air intake 280b consists of one circular opening. The area of the lower air intake port 280b is larger than the area of the upper air intake port 280a (the total area of the three substantially arcuate openings). The cooling fan 280 sucks air from the upper surface air intake port 280a and the lower surface air intake port 280b, and exhausts air from the discharge port 280c whose opening direction is perpendicular to the opening direction of the upper surface air intake port 280a and the lower surface air intake port 280b.

Also, as shown in FIG. 6, the cooling fan 280 is provided near the right side surface 250d (upper right panel portion 251b and lower right panel portion 252b). Here, the right side surface 250d is not provided with air intake/exhaust holes, and external air is not taken in from the right side surface 250d. Cooling fan 280 is arranged above case 250 in the thickness direction. That is, the space below cooling fan 280 in case 250 (lower space Y surrounded by a two-dot chain line and hatched inside) is the space above cooling fan 280 in case 250 (two-dot chain line is wider than the upper space X) surrounded by and hatched inside. Therefore, the flow path resistance on the side of the lower surface intake port 280b is smaller than the flow path resistance on the side of the top surface intake port 280a. In FIG. 6, members such as a condenser lens and a mirror inside the optical device 60 are omitted, and the inside is shown by shading.

Returning to FIG. 3A, on the front side of the cooling fan 280, heat sinks (first heat sink 181 and second heat sink 282) connected to the optical device 60 are provided corresponding to the outlet port 280c of the cooling fan 280. . Specifically, a second heat sink 282 is provided in front of the discharge port 280c of the cooling fan 280, and a first heat sink 281 is provided in front of the second heat sink 282. As shown in FIG. A power supply circuit board 310 (see FIG. 6) is arranged directly below the lower side of the cooling fan 280 (between the cooling fan 280 and the lower case 252, that is, the lower space Y). Further, a third heat sink 283 connected to the optical device 60 is provided on the substantially central rear side of the optical case 61 . The third heat sink 283 has multiple fins. A concave grip portion 270 is provided in the front central portion of the lower surface 250 b of the lower case 252 .

An IC heat sink 285 for cooling the IC chip 301 provided on the lower surface of the control circuit board 300 is attached to the left end of the front side of the control circuit board 300 . As shown in FIG. 7, the IC heat sink 285 is made of a sheet metal member, and includes a contact plate 285a arranged in a flat plate shape so as to contact the IC chip 301, and a comb vertically extending downward from the contact plate 285a. It has a tooth-like first fin 285b and a second fin 285c adjacent to the first fin 285b in a direction perpendicular to it and inclined inward. The IC heat sink 285 is attached to the corner of the optical case 61 with the first fins 285b facing the front surface 250e. Accordingly, the first fin 285b and the second fin 285c are arranged along the outer periphery of the optical case 61. As shown in FIG.

As also shown in FIGS. 8, 9 and 6, a gap is provided between the case 250 of the projection device 10 and the optical case 61 (optical device 60). An area including the gap between the upper surface of the optical case 61 (optical device 60) and the lower surface of the upper panel portion 251a of the upper case 251 of the case 250 (the upper area enclosed by the two-dot chain line hatched inside) ) is a first air flow passage 91 through which the cooling air flows. In addition, an area including a gap between the lower surface of the optical case 61 (optical device 60) (the lower surface of the cover member 62) and the upper surface of the lower panel portion 252a in the lower case 252 of the case 250 (inwardly hatched A lower area surrounded by a two-dot chain line) is a second air flow passage 92 through which cooling air flows. In FIGS. 8 and 9, members such as a condenser lens and a mirror inside the optical device 60 are omitted, and the inside of the closed space is indicated by shading.

The gap between the optical case 61 and the case 250 in the first air circulation path 91 is larger than the gap between the optical case 61 and the case 250 in the second air circulation path 92 . In other words, the vertical cross-sectional area of the first air flow passage 91 as shown in the vertical cross sections of FIGS. Further in other words, the first airflow passage 91 is wider than the second airflow passage 92 . Therefore, the flow rate of cooling air in the first air circulation passage 91 is greater than the flow rate of cooling air in the second air circulation passage 92 . That is, the flow path resistance of the first air flow path 91 is smaller than the flow path resistance of the second air flow path 92 . The cooling air in the second air circulation passage 92 flows through the cover member 62 side of the optical case 61 .

FIG. 10 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 , and a formatter unit including a display encoder 24 and a display drive section 26 . Image signals of various standards input from the input/output connector section 21 are converted by the image conversion section 23 through 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. After that, it is output to the display encoder 24 .

The display encoder 24 develops and stores the input image signal in the video RAM 25 , generates a video signal from the storage contents of the video RAM 25 , and outputs the video signal to the display driving section 26 .

The display drive unit 26 drives the display element 51, which is a spatial light modulator (SOM), at an appropriate frame rate corresponding to the image signal output from the display encoder 24. FIG. The projection device 10 irradiates the display element 51 with the light beam emitted from the optical device 60 via the light guide optical system, thereby forming an optical image with the reflected light of the display element 51 , and the projection side optical system 220 An image is projected and displayed on a projection object such as a screen (not shown) via the . The movable lens group 235 of the projection-side optical system 220 can be driven by a lens motor 45 for zoom adjustment and focus adjustment.

The image compression/decompression unit 31 also performs a recording process of compressing the luminance signal and color difference signal of the image signal by processing such as ADCT and Huffman coding and sequentially writing them to the memory card 32 which is a detachable recording medium. Furthermore, the image compression/decompression unit 31 reads the image data recorded in the memory card 32 in the playback mode, decompresses each image data constituting a series of moving images frame by frame, and converts the image data through the image conversion unit 23 . Output to display encoder 24 . Therefore, the image compression/decompression unit 31 can output 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 apparatus 10, and is composed of a CPU, a ROM that permanently stores operation programs such as various settings, and a RAM that is used as a work memory. .

The key/indicator unit 37 is composed of a main key, an indicator, and the like provided on the housing. An operation signal of the key/indicator section 37 is sent directly to the control section 38 . A key operation signal from the remote controller is received by the Ir receiver 35 , demodulated into a code signal by the Ir processor 36 , and output to the controller 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 sound data into analog data in the projection mode and the reproduction mode, and drives the speaker 48 to amplify the sound.

The control section 38 controls the light source control circuit 41 . The light source control circuit 41 individually controls the operation of the excitation light irradiation device of the optical device 60 so that the optical device 60 emits light in a predetermined wavelength band required for image generation.

Further, the control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection using a plurality of temperature sensors provided in the optical device 60 and the like, and controls the rotational speed of the cooling fan 280 based on the temperature detection results. Further, the control unit 38 causes the cooling fan drive control circuit 43 to continue the rotation of the cooling fan 280 by a timer or the like even after the power of the main body of the projection apparatus 10 is turned off. It also performs control such as turning off the power of

Next, based on FIG. 11, the internal structure of the optical device 60 will be described. 11 shows the first heat sink 281 and the second heat sink 282 in cross section so that the plurality of fins of the first heat sink 281 and the second heat sink 282 are shown.

The optical device 60 is a red light source device 120 that is a light source of red wavelength band light, a green light source device 80 that is a light source of green wavelength band light, and a blue light source device that is a light source of blue wavelength band light, and is also an excitation light source. and a certain excitation light irradiation device 70 . The green light source device 80 is composed of the excitation light irradiation device 70 and the fluorescent plate device 100 . The optical device 60 has a light guiding optical system 140 . The light guiding optical system 140 combines the light beams of the green wavelength band light, the blue wavelength band light, and the red wavelength band light, and guides the light beams of each color wavelength band onto the same optical path.

The excitation light irradiation device 70 is arranged on the right rear side of the optical case 61 . The excitation light irradiation device 70 includes a plurality of semiconductor light emitting elements arranged such that the optical axes thereof are parallel to the rear panel 255 . The semiconductor light emitting device of this embodiment is a plurality of blue laser diodes 71 that emit blue wavelength band light. Each blue laser diode 71 is integrally attached with a collimator lens 73 that enhances the directivity of the light emitted from the blue laser diode 71 and converts it into parallel light. These blue laser diodes 71 are fixed to a holding plate 74 . The holding plate 74 is provided with a total of eight blue laser diodes 71 arranged in two rows and four columns.

The excitation light irradiation device 70 also includes a reflecting mirror group 76 , a condenser lens 77 and a diffusion plate 78 . The reflecting mirror group 76 converts the optical axis of the light emitted from each blue laser diode 71 emitted from the right side to the left side from the rear side to the front side, that is, toward the condenser lens 77 by approximately 90 degrees. A diffusion plate 78 arranged in front of the condenser lens 77 diffuses the emitted light from each blue laser diode 71 reflected by the reflecting mirror group 76 and condensed by the condenser lens 77 at a predetermined diffusion angle. do.

The excitation light irradiation device 70 is connected to the heat pipe 79 on the back side of the holding plate 74 . The heat pipe 79 is connected with the first heat sink 281 . A plurality of blue laser diodes 71 , which are lasers, are cooled by a first heat sink 281 . The tips of the plurality of fins 281 a on the left side of the first heat sink 281 are inclined like the inclined ribs 254 b and vertical ribs 254 c of the exhaust section 260 .

The red light source device 120 is provided on the front side of the excitation light irradiation device 70 in the optical case 61 . The red light source device 120 includes a red light source 121 arranged so that the light beam of the blue laser diode 71 and the optical axis are parallel, and a condenser lens group 125 that collects the light emitted from the red light source 121. . The red light source 121 is a red light emitting diode, which is a semiconductor light emitting element that emits light in the red wavelength band. Red light source device 120 is arranged such that the optical axis of red wavelength band light emitted from red light source device 120 intersects the optical axis of green wavelength band light emitted from fluorescent plate 101 . The rear side of the red light source device 120 is connected to the heat pipe 129 . The heat pipe 129 is connected with the second heat sink 282 . The red light source 121 , which is a light emitting diode, is cooled by the second heat sink 282 .

A fluorescent plate device 100 that constitutes the green light source device 80 includes a fluorescent plate 101, a motor 110, and a condenser lens group 117 on the incident side. The fluorescent plate 101 is a fluorescent wheel arranged so as to be perpendicular to the optical axis of the light emitted from the excitation light irradiation device 70 . This fluorescent screen 101 is rotationally driven by a motor 110 . The condenser lens group 117 converges the ray bundle of the excitation light emitted from the excitation light irradiation device 70 onto the fluorescent screen 101 .

Although not shown, the fluorescent plate 101 has a fluorescent emission area and a diffuse transmission area arranged in parallel in the circumferential direction. The fluorescence emission region receives the blue wavelength band light emitted from the blue laser diode 71 as excitation light, and emits excited fluorescence in the green wavelength band. The diffuse transmission region diffusely transmits the emitted light from the blue laser diode 71 . The emitted light diffusely transmitted is emitted as blue wavelength band light of the optical device 60 .

The light guiding optical system 140 has a first dichroic mirror 141 , a first reflecting mirror 143 , a condenser lens 146 , a second dichroic mirror 148 , a condenser lens 149 , a second reflection mirror 145 and a condenser lens 147 . The first dichroic mirror 141 is located at a position where the blue wavelength band light emitted from the excitation light irradiation device 70, the green wavelength band light emitted from the fluorescent plate 101, and the red wavelength band light emitted from the red light source device 120 intersect. placed in The first dichroic mirror 141 transmits blue wavelength band light and red wavelength band light, and reflects green wavelength band light. The optical axis of the green wavelength band light reflected by the first dichroic mirror 141 is turned 90 degrees toward the left panel 253 toward the condenser lens 149 . Therefore, the optical axis of the red wavelength band light transmitted through the first dichroic mirror 141 coincides with the optical axis of the green wavelength band light reflected by the first dichroic mirror 141 .

A condenser lens 149 is arranged on the left side of the first dichroic mirror 141 . Both the red wavelength band light transmitted through the first dichroic mirror 141 and the green wavelength band light reflected by the first dichroic mirror 141 enter the condenser lens 149 . The second dichroic mirror 148 is arranged on the left side of the condenser lens 149 and behind the condenser lens 147 . The second dichroic mirror 148 reflects red and green wavelength band light and transmits blue wavelength band light. Therefore, the red wavelength band light and the green wavelength band light condensed by the condensing lens 149 are reflected by the second dichroic mirror 148 and converted rearward by 90 degrees. A condenser lens 173 is arranged behind the second dichroic mirror 148 . The red wavelength band light and the green wavelength band light reflected by the second dichroic mirror 148 enter the condenser lens 173 .

The first reflecting mirror 143 is arranged on the optical axis of the blue wavelength band light transmitted through the fluorescent plate 101 . The first reflecting mirror 143 reflects the blue wavelength band light and turns the optical axis of the blue wavelength band light leftward by 90 degrees. A condenser lens 146 is arranged on the left side of the first reflecting mirror 143 . Also, the second reflecting mirror 145 is arranged on the left side of the condenser lens 146 . The second reflecting mirror 145 converts the optical axis of the blue wavelength band light reflected by the first reflecting mirror 143 and condensed by the condensing lens 146 backward by 90 degrees. A condenser lens 147 is arranged behind the second reflecting mirror 145 . The blue wavelength band light reflected by the second reflecting mirror 145 passes through the second dichroic mirror 148 via the condenser lens 147 and enters the condenser lens 173 . In this way, the ray bundles of the respective wavelength band lights of red, green, and blue guided by the light guide optical system 140 are guided onto the same optical path of the light source side optical system 170 .

The light source side optical system 170 includes a condenser lens 173 , an optical axis conversion mirror 179 , a microlens array 175 , a condenser lens 183 , an irradiation mirror 185 and a condenser lens 195 . Note that the condenser lens 195 is also a part of the projection-side optical system 220 because the image light emitted from the display element 51 arranged behind the condenser lens 195 is emitted toward the projection-side optical system 220 . .

Each light beam emitted from the condenser lens 173 is reflected substantially leftward by an optical axis conversion mirror 179 arranged behind the condenser lens 173 . Each ray bundle reflected by the optical axis conversion mirror 179 is made into a ray bundle with a uniform intensity distribution by the microlens array 175, is incident on the irradiation mirror 185 via the condenser lens 183, and is reflected. Each light beam reflected by the irradiation mirror 185 irradiates the display element 51 through the condenser lens 195 at a predetermined angle. The display element 51 is connected to the heat pipe 59 on the back side. The heat pipe 59 connects with the third heat sink 283 . The display element 51 as DMD is cooled by the third heat sink 283 .

A light beam, which is the light source light irradiated onto the image forming surface of the display element 51 by the light source side optical system 170, is reflected by the image forming surface of the display element 51, and projected onto the screen via the projection side optical system 220 as projection light. be done. The projection-side optical system 220 includes a condenser lens 195 and a lens barrel 225 . The lens barrel 225 includes a movable lens group 235 and a fixed lens group.

By configuring the projection device 10 in this way, when the fluorescent plate 101 is rotated and light is emitted from the excitation light irradiation device 70 and the red light source device 120 at different timings, light in each wavelength band of red, green, and blue is guided. The light enters the condensing lens 173 of the light source side optical system 170 via the optical system 140 and further enters the display element 51 via the light source side optical system 170 . Therefore, the DMD, which is the display element 51 of the projection device 10 , time-divisionally displays light of each color according to data, so that a color image can be projected from the projection aperture 11 onto the screen.

During use of the projection apparatus 10, according to the operation of the cooling fan 280, air is taken in from the front surface 250e, the left side surface 250c, and the rear surface 250f to the upper surface air intake port 280a and the lower surface air intake port 280b of the cooling fan 280, and the first heat sink. 281 and the second heat sink 282 are discharged to the outside from the exhaust part 260 . As shown in FIG. 12 , outside air is taken into the cooling fan 280 from the intake portions 261 , 262 , 263 and 264 . At this time, the outside air from the intake portions 261, 262, and 263 facing the first air flow passage 91 and the second air flow passage 92 has a large cross-sectional area of the flow passage (a wide flow passage and a high flow resistance). (Smaller) The amount of outside air flowing through the second air flow passage 92 is small. Therefore, since there is little outside air flowing through the second air flow passage 92 that circulates on the cover member 62 side of the optical case 61 , the air enters the optical case 61 through the opening 61 a of the optical case 61 covered with the cover member 62 . contamination of dust is reduced.

In addition, as described above, the amount of outside air flowing through the second air flow passage 92 is reduced to reduce the amount of dust mixed into the optical case 61. No filter installed. This eliminates the need for maintenance such as filter replacement, and eliminates downtime due to filter clogging.

By forming the case 250 into a compact shape, the projection device 10 can reduce the heat generated by the first heat sink 281, the second heat sink 282, the excitation light irradiation device 70, the red light source device 120, the display element 51, the control circuit board 300, and the like. Internal parts containing parts are densely packed. However, in the projection apparatus 10, the cooling fan 280, the first heat sink 281, and the second heat sink 282 are arranged on the right side 250d, and the air intakes 261 to 264 are provided on the front 250e, the left side 250c, and the rear 250f other than the right side 250d. is provided, and air is drawn into the interior from these three surfaces, so that the internal parts can be cooled well.

The flow of cooling air mainly in the first air flow passage 91 will be described below. The outside air taken in from the left air intake portion 262b of the air intake portion 262 on the front surface 250e of the projection device 10 mainly cools the IC chip 301 (IC heat sink 285), and the right air intake portion 262a mainly cools the fluorescent plate device 100. . The IC heat sink 285 is also cooled by the outside air flowing along the side surface of the optical case 61 among the outside air taken in from the left intake portion 262 b of the intake portion 262 . The cooling air from the intake section 262 that has cooled the IC chip 301 (IC heat sink 285 ) and the fluorescent plate device 100 then cools the red light source device 120 .

On the other hand, the outside air taken in from the intake section 261 on the left side surface 250 c of the projection device 10 mainly cools the projection optical system 220 . In addition, the outside air taken in from the intake part 263 of the rear surface 250f of the projection device 10 directly cools the third heat sink 283 and the display element 51 . Then, the cooling air from the intake section 261 and the cooling air from the intake section 263 join. The merged cooling air further merges with the cooling air from the intake section 262 that has cooled the IC chip 301 (IC heat sink 285 ), the fluorescent plate device 100 and the red light source device 120 , thereby cooling the excitation light irradiation device 70 .

The cooling air that flows through the first air circulation passage 91 in accordance with the operation of the cooling fan 280 cools the control circuit board 300 while performing the cooling described above. Since the control circuit board 300 is arranged at the substantially central position in the vertical direction in the first air circulation passage 91 , the cooling air flows substantially evenly above and below the control circuit board 300 . In the second air circulation passage 92 , the outside air taken in from the intake portions 261 , 262 , 263 is circulated to cool the entire lower surface of the optical case 61 .

The cooling air from the first air flow passage 91 that has cooled the excitation light irradiation device 70 is mainly taken into the upper surface intake port 280a of the cooling fan 280, and the cooling air from the second air flow passage 92 is mainly taken in by the cooling fan. 280 is taken into the lower surface inlet 280b. On the other hand, outside air from the air intake portion 264 of the rear surface 250f located on the rear side of the cooling fan 280 is mainly taken into the lower surface air intake port 280b of the cooling fan 280. As shown in FIG. At this time, power supply circuit board 310 arranged directly below cooling fan 280 is cooled by outside air from intake portion 264 . Part of the cooling air from the first air circulation passage 91 and the cooling air from the second air circulation passage 92 are also used to cool the power supply circuit board 310 .

The cooling air taken in by cooling fan 280 is discharged from outlet 280 c of cooling fan 280 . The cooling air discharged from the discharge port 280c cools the second heat sink 282 arranged on the discharge port 280c side, then cools the first heat sink 281 arranged on the front surface 250e side, and is discharged from the exhaust part 260 to the outside. released. The exhaust direction from the exhaust section 260 is inclined away from the intake direction of the adjacent intake section 262 by the inclined rib 254b, the vertical rib 254c of the exhaust section 260, and the tips of the fins 281a of the first heat sink 281. ing.

The projector 10 is exhausted from one exhaust section 260 arranged on the front surface 250e. Therefore, even if the projection apparatus 10 includes the blower-type cooling fan 280 that requires consideration of the exhaust resistance, other devices can be arranged close to the top, bottom, left, right, and rear of the projection apparatus 10 . Therefore, the projection device 10 can be easily used as an embedded device.

In this way, the outside air (cooling air) taken in from the intake units 261, 262, 263, and 264 in accordance with the operation of the cooling fan 280 is used by members with relatively low heat generation (IC chip 301, fluorescent plate device 100, red The light source device 120, the display element 51, the third heat sink 283) gradually cools down the members with a high heat value (the excitation light irradiation device 70, the power circuit board 310, the second heat sink 282, the first heat sink 281). The excitation light irradiation device 70 is arranged on the leeward side of the red light source device 120 , and the first heat sink 281 is arranged on the leeward side of the second heat sink 282 in consideration of the amount of heat generated by the members.

Here, the front panel 254 includes a partition plate 254e that separates the first heat sink 281 from the first airflow passage 91 and the second airflow passage 92. As shown in FIG. The partition plate 254e is arranged at the left end of the exhaust section 260 (that is, the left side of the first heat sink 281). Between the right side surfaces of the first heat sink 281 and the second heat sink 282 and the upper right panel portion 251b of the upper case 251 and the lower right panel portion 252b of the lower case 252, an upper right panel portion 251b and a lower right panel portion 252b are provided. A plurality of vertical rib-like blocking plates 258 are provided standing from the inner surface of the . The blocking plate 258 prevents the air exhausted from the exhaust part 260 from being caught in the right side of the first heat sink 281 and taken into the cooling fan 280 .

Further, as shown in FIG. 13, the lower case 252 is provided with a shield wall 252c adjacent to the air intake portion 264. As shown in FIG. The shield wall 252c is provided integrally with the lower case 252 molded by metal die casting. The shield wall 252 c is provided parallel to the rear panel 255 . The shield wall 252c has a plurality of communication holes 252c1. The plurality of circulation holes 252c1 are matched in position and shape with the intake holes 264a as the intake portion 264 provided in the rear panel 255, respectively. Specifically, both the flow hole 252c1 and the air intake hole 264a are narrow and oblong holes, and both overlap when viewed from the front (when the flat rear panel 255 is viewed from the flat side (the front-rear direction of the projection device 10)). are arranged as follows.

Due to the shield wall 252c, even if the power supply circuit board 310 is arranged near the plurality of air intake holes 264a, the power supply circuit board 310 is not exposed to static electricity or electromagnetic waves from the outside of the projection apparatus 10 through the air intake holes 264a of the air intake section 264. The impact can be reduced. Since the flow hole 252c1 and the air intake hole 264a are aligned, the shield wall 252c does not block the inflow of outside air from the air intake portion 264. As shown in FIG.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and can be implemented with appropriate modifications. For example, in the present embodiment, the first air flow passage 91 is provided on the upper side of the projection device 10 and the second air flow passage 92 is provided on the lower side. When the portion 61a is provided on the upper surface side and the cover member 62 is provided on the upper surface side of the optical case 61, the second air flow path 92 is provided on the upper side of the projection device 10, and the first air flow path is provided on the lower side. A path 91 may be provided. Also, the shield wall 252c may be provided separately from the lower case 252 . Also, the cooling fan 280 is arranged in front of the first heat sink 281 , and the air that has cooled the second heat sink 282 and the first heat sink 281 is supplied from the first air flow path 91 and the second air flow path 92 to the cooling fan 280 . , and the air may be discharged to the outside directly from the cooling fan 280 via the exhaust section 260 .

According to the embodiment of the present invention described above, the projection apparatus 10 includes the optical device 60, the control circuit board 300 arranged above the optical device 60, and the rear air intake portion of the case 250 on the side opposite to the projection direction. A cooling fan 280 is disposed near the air intake portion 264, and has an upper surface air intake port 280a for air intake from the upper surface and a lower surface air intake port 280b for air intake from the lower surface. A heat sink (first heat sink 281, second heat sink 282) connected to the optical device 60 is provided, and the flow resistance on the side of the bottom air intake 280b is smaller than the flow resistance on the side of the top air intake 280a.

As a result, the outside air sucked from the air intake portion 264 is taken in mainly from the lower surface air intake port 280b of the cooling fan 280, and the air that has cooled the control circuit board 300 is taken in from the upper surface air intake port 280a. The projection device 10 can be well cooled.

Also, the lower air intake 280b of the cooling fan 280 is larger than the upper air intake 280a. As a result, more outside air can be taken in from the intake section 264 via the lower surface side of the cooling fan 280 with low flow resistance.

Cooling fan 280 is arranged above case 250 in the thickness direction, and space Y below cooling fan 280 in case 250 is wider than space X above cooling fan 280 in case 250 . As a result, outside air can be more efficiently taken in from the lower side of the cooling fan 280 through the intake section 264 .

In addition, the cooling fan 280 is provided near the right side surface 250d, which is the first side surface of the case 250, and according to the operation of the cooling fan 280, the front surface 250e of the case 250, on which the projection opening 11 is provided, and the first side surface Outside air is taken into the case 250 from three sides, a left side 250c which is a second side facing (right side 250d) and a rear side 250f facing the front face 250e, and outside air is not taken in from the right side 250d. Thereby, the entire control circuit board 300 can be cooled well.

Even if the air intake portion is provided on the right side 250d where the cooling fan 280 and the light source heat sinks (first heat sink 281 and second heat sink 282) are arranged, the amount of air intake from the other three surfaces is reduced. Therefore, the overall cooling efficiency deteriorates. Therefore, it is desirable that the right side surface 250d of the case 250 is not provided with an intake portion.

Further, if an intake portion is provided on the upper surface 250a of the case 250, there is a possibility that the excitation light irradiation device 70 equipped with a laser light source in the vicinity of the cooling fan 280 can be cooled well. Since the amount of air intake from the cooling system is reduced, the overall cooling balance is lost and the overall cooling efficiency is deteriorated. Therefore, it is desirable that the upper surface 250a of the case 250 is not provided with an intake portion.

Further, if an intake portion is provided on the lower surface 250b of the case 250, a cooling effect may be expected in some cases. However, the lower surface 250b side is closer to the installation surface side of the case 250, and is more susceptible to the user's place of use and manner of use than the upper surface 250a side. For example, if the case 250 is placed on a cushion, there is a risk that air cannot be taken in well. In addition, we want to eliminate as much internal space as possible in order to make the entire product compact. Therefore, in this embodiment, a design in which almost no space is provided on the side of the lower surface 250b is adopted, and the cover member 62 of the optical device 60 is provided on the side of the lower surface 250b. Such a design is also advantageous from the point of view of dust protection. For this reason, it is desirable that the lower surface 250b of the case 250 is not provided with an intake portion.

Also, only one cooling fan 280 is provided in the case 250, and a plurality of cooling fans 280 are not provided. Thereby, miniaturization of the projection device 10 can be realized.

A first heat sink 281 for the laser (blue laser diode 71) and a second heat sink 282 for the light emitting diode (red light source 121) are provided on the cooling fan 280 side of the first heat sink 281. FIG. As a result, the cooling air is blown in order from the smaller calorific value to the larger calorific value, so that the cooling efficiency can be further enhanced.

Also, the control circuit board 300 is arranged in the first air circulation passage 91 provided on the upper side of the optical device 60 , and passes through the first air circulation passage 91 according to the operation of the cooling fan 280 to the cooling fan 280 . The air taken in cools the control circuit board 300 . As a result, the control circuit board 300 including electronic components that generate a large amount of heat can be well cooled.

An IC heat sink 285 made of a sheet metal member for cooling the IC chip 301 is arranged in the first air flow passage 91 . As a result, the IC chip 301, which generates a particularly large amount of heat, can be cooled well.

Further, the first air circulation passage 91 is wider than the second air circulation passage 92 provided on the lower side of the optical device 60, and the flow resistance of the first air circulation passage 91 is equal to that of the second air circulation passage. 92 flow resistance. As a result, a sufficient space can be secured in the first air circulation passage 91, and a device that generates a large amount of heat can be arranged.

The opening 61 a of the optical device 60 is provided on the lower side of the case 250 in the thickness direction, and the opening 61 a is closed by the cover member 62 . Accordingly, by narrowing the gap between the lower side of the optical device 60 and the bottom plate of the case 250, it is possible to reduce the flow of air, that is, the inflow of dust. can be reduced. Also, there is no need to provide a dust filter for the air intakes 261-264.

In addition, the case 250 includes an intake/exhaust unit having an intake unit 262 and an exhaust unit 260 on the front surface 250e where the projection port 11 is provided. Tilt in the direction of separation. As a result, it is possible to reduce the fact that the heated air discharged from the exhaust section 260 arranged on the front surface 250e side is sucked again from the intake section 262 without providing a separate flow passage such as a duct. Therefore, the intake section 262 can also be provided on the front surface 250e side.

Further, the case 250 has a metal shield wall 252c having a plurality of circulation holes 252c1 overlapping with a plurality of air intake holes 264a of an air intake section 264, which are a plurality of air intake and exhaust holes of the air intake and exhaust section, in a front view. As a result, it is possible to reduce an adverse electrical effect on the power supply circuit board 310 arranged close to the intake section 264 . Such a shield wall 252c can be provided not only in the intake portion 264 but also in the exhaust portion, that is, in the intake/exhaust portion having an intake/exhaust hole.

It should be noted that the embodiments described above are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and its equivalents.

Below, the invention described in the first claim of the present application is added.
[1] an optical device;
a control circuit board disposed above the optical device;
a cooling fan disposed near the rear surface air intake portion of the case on the side opposite to the projection direction, and having an upper surface air intake port for air intake from the upper surface and a lower surface air intake port for air intake from the lower surface;
a heat sink provided corresponding to the outlet of the cooling fan and connected to the optical device;
with
A projection apparatus, wherein a flow path resistance on the side of the lower air intake is smaller than a flow path resistance on the side of the upper air intake.
[2] the bottom air intake is larger than the top air intake;
The projection device according to [1] above.
[3] The cooling fan is arranged above the thickness direction of the case,
a space below the cooling fan in the case is wider than a space above the cooling fan in the case,
The projection device according to [1] or [2].
[4] The cooling fan is provided near the first side surface of the case,
In response to the operation of the cooling fan, outside air enters the case from three surfaces: a front surface provided with a projection port in the case, a second side surface facing the first side surface, and a rear surface facing the front surface. taken in,
outside air is not taken in from the first side;
The projection device according to any one of [1] to [3].
[5] Only one cooling fan is provided in the case, and a plurality of cooling fans are not provided.
The projection device according to any one of [1] to [4].
[6] The heat sink includes a first heat sink for a laser and a second heat sink for a light emitting diode on the cooling fan side of the first heat sink.
The projection device according to any one of [1] to [5].
[7] The control circuit board is arranged in a first airflow passage provided on the upper side of the optical device,
Air taken into the cooling fan through the first air flow passage in response to the operation of the cooling fan cools the control circuit board.
The projection device according to any one of [1] to [6].
[8] An IC heat sink made of a sheet metal member for cooling the IC chip is arranged in the first air flow passage.
The projection device according to [7] above.
[9] The first air flow passage is wider than the second air flow passage provided below the optical device, and the flow resistance of the first air flow passage is equal to that of the second air flow passage. less than the flow path resistance of
The projection device according to [7] or [8].
[10] The opening of the optical device is provided on the lower side in the thickness direction of the case,
The opening is closed by a cover member,
The projection device according to any one of [1] to [9].
[11] The case includes an intake/exhaust unit having an intake unit and an exhaust unit on the front surface where the projection port is provided,
the exhaust direction of the exhaust unit is inclined in a direction away from the intake direction of the intake unit;
The projection device according to any one of [1] to [10].
[12] The case has a metal shield wall having a plurality of circulation holes that overlap the plurality of air intake and exhaust holes of the air intake and exhaust portion in a front view,
The projection device according to [11] above.

REFERENCE SIGNS LIST 10 projection device 11 projection port 12 projection image adjustment section 14 output plug 15 power plug 21 input/output connector section 22 input/output interface 23 image conversion section 24 display encoder 25 video RAM
26 display driving unit 31 image compression/decompression unit 32 memory card 35 Ir reception unit 36 Ir processing unit 37 key/indicator unit 38 control unit 41 light source control circuit 43 cooling fan drive control circuit 45 lens motor 47 audio processing unit 48 speaker 48a speaker Part 51 Display element 59 Heat pipe 60 Optical device 61 Optical case 61a Opening 62 Cover member 65 Cover 70 Excitation light irradiation device 71 Blue laser diode 73 Collimator lens 74 Holding plate 76 Group of reflecting mirrors 77 Condensing lens 78 Diffusion plate 79 Heat pipe 80 green light source device 91 first air flow passage 92 second air flow passage 100 fluorescent plate device 101 fluorescent plate 110 motor 117 condenser lens group 120 red light source device 121 red light source 125 condenser lens group 129 heat pipe 140 light guide optical system 141 first dichroic mirror 143 first reflecting mirror 145 second reflecting mirror 146 condenser lens 147 condenser lens 148 second dichroic mirror 149 condenser lens 170 light source side optical system 173 condenser lens 175 microlens array 179 optical axis conversion mirror 183 condenser lens 185 irradiation mirror 195 condenser lens 220 projection side optical system 225 lens barrel 235 movable lens group 250 case 250a upper surface 250b lower surface 250c left side surface (second side surface) 250d right side surface (first side surface)
250e front surface 250f rear surface 250g front left corner 250h rear left corner 250i front right corner 250j rear right corner 251 upper case 251a upper panel 251b upper right panel 252 lower case 252a lower panel 252b lower right panel 252c shield wall 252c1 Flow hole 253 Left panel 254 Front panel 254a Projection port opening 254b Inclined rib 254c Vertical rib 254d U-shaped rib 254e Partition plate 255 Rear panel 256 Horizontal rib 258 Blocking plate 260 Exhaust section 261 Intake section 262 Intake section 262a Right intake section 262b left intake part 263 intake part 264 intake part 264a intake hole 270 grip part 280 cooling fan 280a top intake port 280b bottom intake port 280c discharge port 281 first heat sink 281a fins 282 second heat sink 283 third heat sink 285 IC heat sink 285a contact Plate 285b First fin 285c Second fin 300 Control circuit board 301 IC chip 310 Power supply circuit board SB System bus

Claims (12)

an optical device;
a control circuit board disposed above the optical device;
a cooling fan disposed near the rear surface air intake portion of the case on the side opposite to the projection direction, and having an upper surface air intake port for air intake from the upper surface and a lower surface air intake port for air intake from the lower surface;
a heat sink provided corresponding to the outlet of the cooling fan and connected to the optical device;
with
A projection apparatus, wherein a flow path resistance on the side of the lower air intake is smaller than a flow path resistance on the side of the upper air intake. the bottom air intake is larger than the top air intake;
A projection device according to claim 1 . The cooling fan is arranged above the thickness direction of the case,
a space below the cooling fan in the case is wider than a space above the cooling fan in the case,
3. Projection device according to claim 1 or 2. The cooling fan is provided near the first side surface of the case,
In response to the operation of the cooling fan, outside air enters the case from three surfaces: a front surface provided with a projection port in the case, a second side surface facing the first side surface, and a rear surface facing the front surface. taken in,
outside air is not taken in from the first side;
4. A projection device according to any one of claims 1 to 3. Only one cooling fan is provided in the case, and a plurality of cooling fans are not provided.
5. A projection device according to any one of claims 1 to 4. The heat sink comprises a first heat sink for a laser and a second heat sink for a light emitting diode closer to the cooling fan than the first heat sink.
6. A projection device according to any one of claims 1-5. The control circuit board is arranged in a first airflow passage provided on the upper side of the optical device,
Air taken into the cooling fan through the first air flow passage in response to the operation of the cooling fan cools the control circuit board.
7. A projection device according to any one of claims 1-6. An IC heat sink made of a sheet metal member for cooling the IC chip is arranged in the first air flow passage,
8. Projection device according to claim 7. The first air flow passage is wider than the second air flow passage provided below the optical device, and the flow resistance of the first air flow passage is equal to that of the second air flow passage. less than the resistance
9. Projection device according to claim 7 or 8. The opening of the optical device is provided on the lower side in the thickness direction of the case,
The opening is closed by a cover member,
10. A projection device according to any one of claims 1-9. The case includes an intake/exhaust unit having an intake unit and an exhaust unit on the front surface where the projection port is provided,
The exhaust direction of the exhaust unit is inclined in a direction away from the intake direction of the intake unit.
11. A projection device according to any one of claims 1-10. The case has a metal shield wall having a plurality of circulation holes that overlap the plurality of air intake and exhaust holes of the air intake and exhaust portion in a front view,
12. Projection device according to claim 11.

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