Case and Projector

Abstract

To provide a case and a projection apparatus that can prevent falling.SOLUTION: A case of a projection apparatus includes a bottom plate 16 which is one of the outer walls of the case, and an insert nut 161 provided in a hole formed in the bottom plate 16 and including a cylindrical body 161a which is a tubular part. In the insert nut 161, a first female screw portion 161b is formed on the inner surface of the cylindrical body 161a on the outer side of the outer wall of the case, and a second female screw portion 161c having a nominal diameter smaller than that of the first female screw portion 161b and a flange portion 161e are formed on the inner side of the outer wall of the case.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a case and a projection device equipped with the case. [Background technology]

[0002] Conventionally, cases with a ceiling suspension structure and projection devices with this case have been disclosed. For example, Patent Document 1 discloses a projection device that includes a sheet metal member (metal shield) that is connected to an object to be accommodated, such as an optical case, housed inside the case of the projection device, and an insert nut that is connected to a hanging metal fitting or the like. A flange-shaped fixing portion is formed in this insert nut. A recess is formed in the fixing portion, and the sheet metal member and the insert nut are fixed by a screw through this recess. The fixing screw is a countersunk screw that is screwed into the female screw portion of the sheet metal member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-4780 A Summary of the Invention [Problem to be solved by the invention]

[0004] When the projection device was installed suspended from the ceiling and exposed to an oily environment for a long period of time, solvent cracking, a type of cracking that occurs when a solvent is added, could occur, damaging the resin case and causing the projection device to fall.

[0005] In view of the above, an object of the present invention is to provide a case and a projection device that can prevent the case and projection device from falling. [Means for solving the problem]

[0006] The case of the present invention comprises a case outer wall made of a meltable resin material, and an insert nut provided in a hole formed in the case outer wall and including a cylindrical portion, the insert nut having a first female screw portion formed on the inner surface of the cylindrical portion on the outer side of the case outer wall for screwing to a ceiling hanger, a second female screw portion having a smaller nominal diameter than the first female screw portion on the inner side of the case outer wall for screwing a first screw via a sheet metal member to which an object to be accommodated on the inner side of the case outer wall is connected, and a flange portion, and the insert nut is provided with an annular groove for engaging with the molten resin on the inner peripheral surface of the hole. A second screw is screwed from a burring-shaped connection hole formed in the sheet metal member to a boss portion standing on the inner surface of the outer wall of the case. It is characterized by:

[0007] The projection device of the present invention is characterized in having the above-mentioned case, a light source device, a display element that is irradiated with light source light from the light source device and forms image light, a projection optical system that projects the image light emitted from the display element onto a screen, and a projection device control unit that controls the display element and the light source device. Effect of the Invention

[0008] According to the present invention, it is possible to provide a case and a projection device that can prevent the case from falling. [Brief description of the drawings]

[0009] [Figure 1] 1 is an external perspective view of a projection device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a bottom view of the projection device according to the embodiment of the present invention. [Diagram 3] FIG. 2 is a diagram showing functional circuit blocks of the projection device according to the embodiment of the present invention. [Figure 4] FIG. 2 is a schematic plan view showing the internal structure of a projection device according to an embodiment of the present invention. [Diagram 5] 1 is a schematic plan view showing a configuration of a light source device and a light source side optical system of a projection device according to an embodiment of the present invention. [Figure 6] 6 is a cross-sectional view of the projection device according to the embodiment of the present invention taken along line VI-VI in FIG. 2. [Figure 7] 7 is a cross-sectional view taken along line VII-VII of FIG. 4 in the projection device according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described. As shown in Fig. 1 and Fig. 2, the projection device 10 is formed in a substantially rectangular parallelepiped shape. The case 1 of the projection device 10 is provided with a top panel 11, a front panel 12, a rear panel 13, a right panel 14, a left panel 15, and a bottom plate 16 (bottom panel), which are the outer walls of the case. In the following description of this embodiment, the left and right of the projection device 10 refer to the left and right directions relative to the projection direction, and the front and rear refer to the front and rear directions relative to the screen side of the projection device 10.

[0011] A key / indicator section 37 is provided on the top panel 11 of the projection device 10. This key / indicator section 37 has arranged thereon keys and indicators for performing various settings, such as a power switch key, a power indicator that notifies the user that the power is on or off, a projection switch key that switches projection on and off, and an overheat indicator that notifies the user when the light source device, the display element, the control circuit, or the like, overheats.

[0012] The projection image adjustment unit 15a provided on the left panel 15 side includes one or more rotating knobs. Operating the rotating knob adjusts the position of a movable lens in the projection optical system 220, which will be described later in Fig. 4, making it possible to adjust the size and focus of the projected image. The projection device 10 also includes an infrared receiving unit (not shown) that receives control signals from a remote controller.

[0013] A light output section 12a recessed in a mortar shape is provided at the left front corner of the projection device 10. An air intake 310 formed of a plurality of rectangular holes is provided on the inner surface on the right side of the light output section 12a. A height adjustment button 12b is provided at the bottom end of the front panel 12. The projection device 10 can make the support legs 12c protrude and retract from the bottom while the height adjustment button 12b is pressed. By operating the height adjustment button 12b, the support legs 12c can be fixed at any protruding height, and the projection angle of the projection device 10 can be adjusted. An air intake 320 is provided on the left panel 15 side including the front panel 12 and a part of the rear panel 13. An exhaust port 330 (see FIG. 4) is provided on the right panel 14.

[0014] The rear panel 13 is provided with various input / output connector sections 21 including a USB terminal, a D-SUB terminal for inputting image signals, an S terminal, an RCA terminal, an HDMI (registered trademark) terminal, etc., and a power adapter plug (see FIG. 4).

[0015] 3 is a functional circuit block diagram of the projection device 10. The projection device control unit is composed of a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, etc. Image signals of various standards input from the input / output connector unit 21 are converted by the image conversion unit 23 via the input / output interface 22 and the system bus SB so as to be unified into image signals of a predetermined format suitable for display, and then output to the display encoder 24.

[0016] Furthermore, the display encoder 24 develops and stores the input image signal in a video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to a display driver .

[0017] The display drive unit 26 drives the display element 51, which is a spatial light modulation element (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 light reflected from the display element 51 by irradiating the light beam emitted from the light source device 60 onto the display element 51 via a light guiding optical system, and projects and displays the image on a screen (not shown) via the projection optical system 220. The movable lens group of the projection optical system 220 can be driven by a lens motor 45 for zoom adjustment and focus adjustment.

[0018] Moreover, the image compression / expansion unit 31 performs a recording process in which the luminance signal and the color difference signal of the image signal are compressed by processes such as ADCT and Huffman coding, and the data is sequentially written to a memory card 32, which is a removable recording medium. Furthermore, the image compression / expansion unit 31 reads out image data recorded on the memory card 32 in the playback mode, expands each piece of image data constituting a series of moving images on a frame-by-frame basis, and outputs the expanded data to the display encoder 24 via the image conversion unit 23. Thus, the image compression / expansion unit 31 can display moving images, etc., based on the image data stored in the memory card 32.

[0019] The control unit 38 is responsible for controlling the operation of each circuit in the projection device 10, and is composed of a CPU, a ROM in which operating programs such as various settings are permanently stored, a RAM used as a work memory, and the like.

[0020] The key / indicator section 37 is composed of a main key and an indicator provided on the housing. An operation signal of the key / indicator section 37 is directly sent to the control section 38. In addition, 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.

[0021] The control unit 38 is connected to an audio processing unit 47 via a system bus SB. The audio processing unit 47 includes a sound source circuit such as a PCM sound source, and converts audio data into analog data in the projection mode and the playback mode, and drives a speaker 48 to emit amplified sound.

[0022] The control unit 38 controls a light source control circuit 41. The light source control circuit 41 controls the light source device 60 to emit light of a predetermined wavelength band required for image generation.

[0023] The control unit 38 also controls the cooling fan drive control circuit 43 to detect temperatures using a plurality of temperature sensors provided in the light source device 60, etc., and controls the rotation speed of the cooling fan based on the results of this temperature detection. The control unit 38 also controls the cooling fan drive control circuit 43 to continue rotating the cooling fan using a timer or the like even after the power supply of the projection device 10 body is turned off, or to turn off the power supply of the projection device 10 body based on the results of temperature detection by the temperature sensors.

[0024] FIG. 4 is a schematic plan view showing the internal structure of the projection device 10. The projection device 10 includes a light source device 60, a light source side optical system 170, and a projection optical system 220 at the front and center. The light source device 60 includes an optical case 61, which houses optical members constituting the light source side optical system 170 and the projection optical system 220. The projection device 10 also includes a circuit board 241 connected to the input / output connector unit 21 at the rear, and a control circuit board 242 including a power supply circuit block and a light source control block. The optical case 61, the power supply, and the like are connected and fixed to a sheet metal member 162 (see FIG. 6) as a metal shield disposed on the inner surface of the bottom plate 16. The sheet metal member 162 is fixed to the bottom plate 16 by a plurality of bosses (not shown) standing on the inner surface of the bottom plate 16 and screws.

[0025] The projection device 10 is equipped with a plurality of exhaust fans 401-403 arranged close to the inside of the right panel 14 of the housing. Each of the exhaust fans 401-403 is an axial flow fan arranged substantially parallel to the right panel 14 so as to blow air toward the exhaust port 330. Therefore, the entire cooling air inside the projection device 10 flows from the left panel 15 side, where the intake ports 310, 320 are formed, toward the right panel 14 side, where the exhaust port 330 is formed.

[0026] 5, the configurations of the light source device 60 and the light source side optical system 170 will be described. The light source device 60 includes an excitation light irradiating device 70 which is a light source of blue wavelength band light and also an excitation light source, a green light source device 80 which is a light source of green wavelength band light, a red light source device 120 which is a light source of red wavelength band light, and a color wheel device 200. The green light source device 80 is composed of the excitation light irradiating device 70 and a fluorescent wheel device 100.

[0027] A light guide optical system 140 that guides light of each color wavelength band is disposed in the light source device 60. The light guide optical system 140 guides the light emitted from the excitation light irradiating device 70, the green light source device 80, and the red light source device 120 to the light source side optical system 170.

[0028] The excitation light irradiation device 70 is disposed near the front panel 12 of the projection device 10. The excitation light irradiation device 70 includes a plurality of blue laser diodes 71 held by an element holder 72, condenser lenses 77, 78, and a diffusion plate 79. The blue laser diodes 71 are semiconductor light-emitting elements, and are disposed so that their optical axes are parallel to the rear panel 13. The excitation light irradiation device 70 is cooled by a cooling unit 500 or the like disposed within the projection device 10. A heat sink 520 of the cooling unit 500, which is connected to the excitation light irradiation device 70 via a heat pipe 510, is disposed approximately at the center side in the front-rear direction of the projection device 10 (see FIG. 4).

[0029] The light source group described above is formed by arranging a plurality of blue laser diodes 71 in a matrix. A collimator lens 73 is arranged on the optical axis of each blue laser diode 71 to convert the light emitted from the blue laser diode 71 into parallel light so as to increase the directivity of the light. The condenser lens 77 and the condenser lens 78 reduce the light beam emitted from the blue laser diode 71 in one direction and emit the reduced beam to a diffusion plate 79. The diffusion plate 79 diffuses and transmits the incident blue wavelength band light to a first dichroic mirror 141 arranged on the fluorescent wheel 101 side.

[0030] The fluorescent wheel device 100 is disposed on the optical path of the excitation light emitted from the excitation light emitting device 70, near the front panel 12. The fluorescent wheel device 100 includes a fluorescent wheel 101, a motor 110, a condenser lens group 111, and a condenser lens 115. The fluorescent wheel 101 is disposed at an upper position of the fluorescent wheel 101 so as to be perpendicular to the optical axis of the emitted light from the excitation light emitting device 70. The motor 110, disposed below the condenser lens group 111 and the condenser lens 115, drives the fluorescent wheel 101 to rotate.

[0031] The fluorescent wheel 101 is formed in a disk shape and can be rotated by driving the motor 110. Although not shown, the fluorescent wheel 101 has a fluorescent light emitting region and a transmission region arranged side by side in the circumferential direction. The base material of the fluorescent wheel 101 can be made of a metal base material such as copper or aluminum. The surface of the base material facing the excitation light irradiating device 70 is mirror-finished by silver deposition or the like. In the fluorescent light emitting region, a green phosphor layer is formed on the mirror-finished surface. The fluorescent light emitting region receives blue wavelength band light from the excitation light irradiating device 70 as excitation light and emits fluorescent light in a green wavelength band in all directions. A part of the fluorescent light is directly emitted to the condenser lens 111, and the other part is reflected by the reflecting surface of the fluorescent wheel 101 and then emitted to the condenser lens 111.

[0032] The transmission region of the luminescent wheel 101 can be formed by fitting a transparent base material having light-transmitting properties into a cutout portion formed in the base material of the luminescent wheel 101. The transparent base material is made of a transparent material such as glass or resin. The transparent base material may be provided with a diffusion layer on the surface of the side irradiated with the blue wavelength band light or the opposite side. The diffusion layer can be provided, for example, by forming fine irregularities on the surface of the transparent base material by sandblasting or the like. The blue wavelength band light from the excitation light irradiating device 70 that is incident on the transmission region is transmitted or diffused through the transmission region and is incident on the condenser lens 115.

[0033] The condenser lens group 111 condenses the light beam of blue wavelength band light emitted from the excitation light irradiation device 70 onto the fluorescent wheel 101, and also condenses the fluorescence emitted from the fluorescent wheel 101 in the direction of the right panel 14. The condenser lens 115 condenses the light beam emitted from the fluorescent wheel 101 in the direction of the left panel 15.

[0034] The red light source device 120 includes a red light emitting diode 121, which is a semiconductor light emitting element arranged so that the optical axis of the emitted light is parallel to that of the blue laser diode 71, and a condensing lens group 125 that condenses the red wavelength band light emitted from the red light emitting diode 121. The red light source device 120 is arranged so that the optical axis of the red wavelength band light emitted by the red light emitting diode 121 intersects with the optical axis of the green wavelength band light emitted from the fluorescent wheel 101 and reflected by the first dichroic mirror 141. The excitation light irradiation device 70 is cooled by a cooling unit 600 or the like arranged in the projection device 10. A heat sink 620 of the cooling unit 600 connected to the red light source device 120 via a heat pipe 610 is arranged approximately at the center side in the front-rear direction of the projection device 10 (see FIG. 4).

[0035] The light guide optical system 140 includes a first dichroic mirror 141, a second dichroic mirror 142, a third dichroic mirror 143, condenser lenses 145, 146, and 147 for condensing the light beams, and a reflecting mirror 144 for converting the optical axes of the light beams to make them coincident with each other. Each component will be described below.

[0036] The first dichroic mirror 141 is disposed at a position between the diffusion plate 79 and the condenser lens group 111. The first dichroic mirror 141 transmits the blue wavelength band light toward the condenser lens group 111 side, and reflects the green wavelength band light toward the condenser lens 145 to convert the optical axis thereof by 90 degrees.

[0037] The second dichroic mirror 142 is a combining means for combining the green wavelength band light and the red wavelength band light on the same optical axis, and reflects the green wavelength band light and transmits the red wavelength band light. The green wavelength band light reflected by the first dichroic mirror 141 is collected by the collecting lens 145 and enters the second dichroic mirror 142.

[0038] The green wavelength band light reflected by the second dichroic mirror 142 is collected by the collecting lens 146 and enters the third dichroic mirror 143 arranged on the left panel 15 side of the collecting lens 146. The third dichroic mirror 143 reflects the red wavelength band light and the green wavelength band light and transmits the blue wavelength band light. Therefore, the third dichroic mirror 143 reflects the red wavelength band light and the green wavelength band light collected by the collecting lens 146 to the collecting lens 173, and guides the red wavelength band light and the green wavelength band light.

[0039] Furthermore, when the irradiation area of ​​the fluorescent wheel 101 with the blue wavelength band light is a transmission area, the blue wavelength band light emitted from the blue laser diode 71 transmits through the fluorescent wheel 101, is collected by the collecting lens 115, and then is guided to the reflecting mirror 144. The reflecting mirror 144 is disposed on the optical axis of the blue wavelength band light that is transmitted or diffused through the fluorescent wheel 101. The reflecting mirror 144 reflects the blue wavelength band light and guides the optical axis to the collecting lens 147 disposed on the rear panel 13 side. The third dichroic mirror 143 transmits the blue wavelength band light collected by the collecting lens 147 and guides it toward the collecting lens 173.

[0040] The light source side optical system 170 includes a condenser lens 173, a light tunnel 175, a condenser lens 178, an optical axis conversion mirror 181, a condenser lens 183, an irradiation mirror 185, and a condenser lens 195. The condenser lens 195 emits image light emitted from a display element 51 arranged on the rear panel 13 side of the condenser lens 195 toward the projection optical system 220, and is therefore also a part of the projection optical system 220.

[0041] Condenser lens 173 is disposed on the third dichroic mirror 143 side of light tunnel 175. Condenser lens 173 collects the green wavelength band light, blue wavelength band light, and red wavelength band light guided from third dichroic mirror 143. The color wavelength band lights collected by condenser lens 173 are irradiated onto color wheel 201 of color wheel device 200.

[0042] Color wheel device 200 includes color wheel 201 and motor 210 that rotates color wheel 201. Color wheel device 200 is disposed between condenser lens 173 and light tunnel 175 so that the optical axis of the light beam emitted from condenser lens 173 and the irradiation surface on color wheel 201 are perpendicular to each other.

[0043] The color wheel 201 is formed in a disk shape and can be rotated by a motor 210. The color wheel 201 has a full-color transmission region and a blue / red transmission region arranged in parallel in the circumferential direction. The full-color transmission region can transmit blue wavelength band light, green wavelength band light, and red wavelength band light. The blue / red transmission region can transmit blue wavelength band light and red wavelength band light. The blue wavelength band light, green wavelength band light, and red wavelength band light incident on the color wheel 201 are modulated by transmitting through the full-color transmission region or the blue / red transmission region, and then guided toward the light tunnel 175. The light beam incident on the light tunnel 175 becomes a light beam with a uniform intensity distribution in the light tunnel 175.

[0044] Collecting lens 178 is disposed on the optical axis of light tunnel 175 on the rear panel 13 side. Optical axis changing mirror 181 is disposed further toward rear panel 13 from collecting lens 178. The light beam emitted from the exit port of light tunnel 175 is collected by collecting lens 178, and then reflected by optical axis changing mirror 181 toward the left panel 15 side.

[0045] The light beam reflected by the optical axis conversion mirror 181 is collected by the collecting lens 183, and then is irradiated at a predetermined angle by the irradiation mirror 185 via a condenser lens 195 to the display element 51. A heat sink 190 is provided below and in front of the display element 51, which is a DMD. The display element 51 is cooled by this heat sink 190.

[0046] 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 as projection light onto the screen via the projection optical system 220. Here, the projection optical system 220 is composed of a condenser lens 195, and a movable lens group and a fixed lens group provided in a lens barrel 230. The lens barrel 230 is a variable focus lens, and is formed to allow zoom adjustment and focus adjustment. The movable lens group is formed to be movable automatically by the lens motor 45 or manually by the projection image adjustment unit 15a.

[0047] By configuring the projection device 10 in this manner, when the fluorescent wheel 101 and the color wheel 201 are rotated synchronously and light is emitted from the excitation light irradiation device 70 and the red light source device 120 at appropriate timing, the green, blue and red wavelength band lights are incident on the condenser lens 173 via the light guide optical system 140 and are then incident on the display element 51 via the light source side optical system 170. Therefore, the display element 51 displays the lights of the respective colors in a time-division manner according to the data, thereby making it possible to project a color image on the screen.

[0048] The projection device 10 can project images while suspended from the ceiling by connecting it to a ceiling hanger (not shown). As shown in FIG. 2, the bottom plate 16 of the case 1 of the projection device 10 has two connection parts 16a and two connection parts 16b, which are fixed to the ceiling hanger by screws, for a total of four connection parts. The connection parts 16a and 16b are arranged at the top and bottom of the left side of the bottom plate 16 as viewed in FIG. 2, and the connection parts 16b are arranged at the top and bottom of the right side. The ceiling suspension structure 160 provided in the connection part 16a will be described below. The connection part 16b is formed by fixing a bottomed cylindrical insert nut (not shown) having a flange at its end and a screw part to the bottom plate 16 by welding.

[0049] As shown in FIG. 6, the ceiling suspension structure 160 formed in the connection portion 16a has bosses 16a1 and 16a2 formed on the outer and inner surfaces of the bottom plate 16, respectively. The bosses 16a1 and 16a2 have holes 16a3 penetrating the inner and outer surfaces of the bottom plate 16. The insert nut 161 is inserted into the hole 16a3 and fixed. The insert nut 161 is formed of a metal material such as a copper alloy, and is formed by appropriately plating or the like. The insert nut 161 is attached by inserting the insert nut 161 into the hole 16a3 and then applying heat to the insert nut 161 to melt the inner peripheral surface of the hole 16a3 of the case 1 (bottom plate 16) made of a resin material. In this way, the insert nut 161 is welded to the inner peripheral surface of the hole 16a3 and fixed.

[0050] The insert nut 161 has a cylindrical body 161a (tubular portion) having a substantially cylindrical shape. Annular grooves 161a1 are formed at appropriate intervals on the outer surface of the cylindrical body 161a. When the insert nut 161 is welded and fixed to the bottom plate 16, the molten resin on the inner peripheral surface of the hole portion 16a3 engages with the annular grooves 161a1, so that the insert nut 161 can be firmly welded and fixed to the hole portion 16a3.

[0051] A first female screw portion 161b is formed on the inner surface of the cylindrical body 161a on the outer side of the outer wall of the case 1, which is one side of the insert nut 161. A second female screw portion 161c is formed on the inner surface of the cylindrical body 161a on the inner side of the outer wall of the case 1, which is the other side of the insert nut 161. The first female screw portion 161b is disposed so as to face the outer surface of the bottom plate 16. The second female screw portion 161c is set to have a smaller nominal diameter than the first female screw portion 161b. Therefore, the second female screw portion 161c can be set to have a shorter screw length than the first female screw portion 161b. Meanwhile, a partition wall 161d is formed between the first female screw portion 161b and the second female screw portion 161c.

[0052] A flange portion 161e is formed on the outer circumferential surface at the other end of the cylindrical main body 161a (in other words, the outer circumferential surface end corresponding to the second female screw portion 161c of the insert nut 161). The flange portion 161e is received in a counterbore portion formed on the upper surface of the boss portion 16a2. Therefore, the upper surface of the boss portion 16a2 is an annular flat surface. The flange portion 161e is engaged with the bottom plate 16 by the counterbore portion into which it is received, and supports the load of the case 1 (i.e., the housing portion) when the projection device 10 is suspended from a ceiling. A first screw 163 is screwed into the second female screw portion 161c through the screw fixing hole portion 162a of the sheet metal member 162 described above.

[0053] Also, the sheet metal member 162 is fixed to the bottom plate 16 together with the optical case 61 at another fixed location. For example, the optical case fixing portion 62 in FIG. 4 has a connection structure 165 shown in FIG. 7 formed therein. The connection structure 165 has a boss portion 16c standing upright from the inner surface of the bottom plate 16, which is omitted in FIG. 7. A large diameter hole portion 16c1 is formed on the upper side of the boss portion 16c. A small diameter hole portion 16c2 is formed on the lower side communicating with the large diameter hole portion 16c1. A cylindrical portion 162b1 protruding from a burred-shaped connection hole 162b formed in the sheet metal member 162 is inserted into the large diameter hole portion 16c1. If the plate thickness is thin, it is impossible to machine a screw hole, so a rising portion is formed around the burred hole in this way to make it possible to machine a screw hole. A hole portion 61b for fixing the optical case 61 is arranged around the upper surface of the connection hole 162b of the sheet metal member 162.

[0054] Here, the outer diameter of the cylindrical portion 162b1 in the connection hole 162b of the sheet metal member 162 is sufficiently smaller than the inner diameter of the large diameter hole portion 16c1 of the boss portion 16c. Therefore, a gap is formed between the cylindrical portion 162b1 and the large diameter hole portion 16c1. The hole portion 61b of the optical case 61 and the connection hole 162b of the sheet metal member 162 are fixed to the boss portion 16c (containing resin or the like) by the second screw 166. The inner peripheral surface of the connection hole 162b (cylindrical portion 162b1) and the inner peripheral surface of the small diameter hole portion 16c2 do not initially have a screw groove, and a self-tapping structure 167 is formed by screwing the second screw 166 such as a tapping screw from the connection hole 162b to the small diameter hole portion 16c2.

[0055] The connection structure 165 thus formed is applied to a plurality of optical case fixing parts that fix the sheet metal member 162, the optical case 61, and the bottom plate 16. The connection structure 165 can widen the tolerance of the machining position accuracy of the connection hole 162b of the sheet metal member 162. That is, even if the connection hole 162b and the large diameter hole portion 16c1 (small diameter hole portion 16c2) of the boss portion 16c are misaligned, the misalignment is absorbed to some extent by the gap between the cylindrical portion 162b1 and the large diameter hole portion 16c1. Then, the self-tapping structure 167 forms a screw groove extending from the connection hole 162b to the small diameter hole portion 16c2, and the optical case 61 is fixed to the sheet metal member 162 and also to the bottom plate 16, so that the second screw 166 can be firmly screwed in.

[0056] As described above, according to the embodiment of the present invention, the case 1 includes the bottom plate 16, which is one of the outer walls of the case, and the insert nut 161, which is provided in the hole 16a3 formed in the connection portion 16a of the bottom plate 16 and includes a cylindrical body 161a (cylindrical portion). The insert nut 161 has a first female screw portion 161b formed on the inner surface of the cylindrical body 161a on the outer side of the bottom plate 16, and has a second female screw portion 161c having a smaller nominal diameter than the first female screw portion 161b and a flange portion 161e formed on the inner side of the bottom plate 16.

[0057] This allows the second female screw portion 161c to be used to connect an object to be housed, such as the optical case 61, and the hanger for hanging from the ceiling can be connected to the insert nut 161, providing a case 1 that can be prevented from falling even if a solvent crack occurs in the case 1.

[0058] Furthermore, the head of the screw that screws into the second female screw portion 161c can be made smaller than the head of the screw that screws into the first female screw portion 161b. The screw that screws into the second female screw portion 161c is disposed inside the case 1 and screws a member housed in the case 1, and because the head can be made small in this way, it is possible to provide a case 1 that provides increased freedom in the layout of the devices housed in the case 1.

[0059] Furthermore, the insert nut 161 has a partition wall 161d between the first female screw portion 161b and the second female screw portion 161c. This makes it possible to reduce the intrusion of oil components into the case 1 through the insert nut 161 in restaurants and other establishments where oil components float in the indoor space.

[0060] Furthermore, a first screw 163 is screwed into the second female screw portion 161c via a sheet metal member 162 to which an object to be contained, such as the optical case 61 or a power supply, which is housed inside the bottom plate 16, is connected. This allows the ceiling hanger to be connected to the sheet metal member 162 to which the object to be contained, which is a heavy object, via the insert nut 161, without going through the case outer wall (bottom plate 16) of the resin case 1.

[0061] The connection structure for connecting the accommodated body to the sheet metal member 162 includes a self-tapping structure 167 formed from a burring-shaped connection hole 162b formed in the sheet metal member 162 to a boss portion 16c standing on the inner surface of the bottom plate 16, and a second screw 166 that screws into the self-tapping structure 167. As a result, the accommodated body is fixed to the bottom plate 16 and also to the sheet metal member 162.

[0062] The projection device 10 also includes a case 1 having a ceiling suspension structure 160, a light source device 60, a display element 51, a projection optical system 220, and a projection device control unit. This allows the head of the screw that engages with the second female screw portion 161c used inside the case 1 to be made smaller. This allows the projection device 10 to be provided with improved freedom in the layout of devices such as the light source device 60 and the display element 51 that are placed inside the case 1. That is, the first screw 163 that fixes the insert nut 161 to the sheet metal member 162 is attached from the inside of the sheet metal member 162. On the other hand, an object to be accommodated, such as an optical case, is attached to the inside of the sheet metal member 162. If the head of the first screw 163 fixing the insert nut 161 to the sheet metal member 162 is large or is a countersunk screw, the layout of the contained object will be restricted due to interference from the first screw 163 when attaching the contained object to the sheet metal member 162. However, by making the head of the first screw 163 smaller, the freedom of layout of the equipment can be improved.

[0063] Among the multiple locations where the case outer wall is screwed via the sheet metal member 162, the locations where the insert nuts 161 are provided are only some of the locations. When the insert nut 161 is provided at one location, the location where the insert nut 161 is provided may be near the center of gravity when the projection device 10 is viewed in a plane. When the insert nuts 161 are provided at two locations, the distance between the line connecting the two insert nuts 161 and the center of gravity of the projection device 10 viewed in a plane may be close, and when the insert nuts 161 are provided at three or more locations, the center of gravity of the projection device 10 viewed in a plane may be located within the range of the area connecting the insert nuts 161.

[0064] The above-described embodiments 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, substitutions, 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 and its equivalents described in the claims.

[0065] The invention described in the first claim of this application is set forth below. [1] The outer wall of the case; An insert nut provided in a hole formed in the outer wall of the case and including a cylindrical portion; Equipped with The insert nut is a case characterized in that a first female thread portion is formed on the inner surface of the cylindrical portion on the outer side of the case outer wall, and a second female thread portion having a smaller nominal diameter than the first female thread portion and a flange portion are formed on the inner side of the case outer wall. [2] The case described in [1], wherein the insert nut has a partition wall formed between the first female thread portion and the second female thread portion. [3] The case described in [1] or [2], characterized in that a first screw is screwed into the second female screw portion via a sheet metal member to which an object to be contained inside the outer wall of the case is connected. [4] The case described in [3] above, characterized in that it has a second screw screwed from a burring-shaped connection hole formed in the sheet metal member to a boss portion standing on the inner surface of the outer wall of the case. [5] The case described in [3] or [4], characterized in that the locations at which the insert nuts are provided are only some of the multiple locations at which the sheet metal member is screwed to the outer wall of the case. [6] A case according to any one of [1] to [5] above; A light source device; a display element that is irradiated with light from the light source device and forms image light; a projection optical system that projects the image light emitted from the display element onto a screen; a projection device control unit that controls the display element and the light source device; A projection device comprising: [7] When the insert nut is provided at one location, the location where the insert nut is provided is near the center of gravity when the device is viewed in a plan view, When the insert nuts are provided at two locations, the distance between the line connecting the two insert nuts and the center of gravity of the device in a plan view is close, The projection device described in [6], characterized in that when the insert nuts are provided at three or more locations, the center of gravity of the device in a planar view is located within the area connecting each of the insert nuts. [Explanation of symbols]

[0066] 1 Case 10 Projector 11 Top Panel 12 Front Panel 12a Light output part 12b Height adjustment button 12c Support leg 13 Rear panel 14 Right Panel 15 Left Panel 15a Projection image adjustment section 16 Bottom plate 16a Connection part 16a1 Boss part 16a2 Boss portion 16a3 Hole portion 16b Connection part 16c Boss part 16c1 Large diameter hole 16c2 Small diameter hole 21 Input / Output Connector Section 22 Input / Output Interface 23 Image conversion unit 24 Display encoder 25 Video RAM 26 Display driver 31 Image compression / expansion section 32 Memory card 35 Ir receiving unit 36 ​​Ir processing unit 37 Key / indicator section 38 Control section 41 Light source control circuit 43 Cooling fan drive control circuit 45 Lens motor 47 Audio processing unit 48 Speaker 51 Display element 60 Light source device 61 Optical case 61b Hole 62 Optical case fixing part 70 Excitation light irradiation device 71 Blue laser diode 72 Element holder 73 Collimator lens 77 Condenser lens 78 Condenser lens 79 Diffuser plate 80 Green light source device 100 Fluorescent wheel device 101 Fluorescent wheel 110 Motor 111 Condenser lens group 111 Condenser lens 115 Condenser lens 120 Red light source device 121 Red light emitting diode 125 Condenser lens group 140 Light guide optical system 141 First dichroic mirror 142 Second dichroic mirror 143 Third dichroic mirror 144 Reflecting mirror 145 Condenser lens 146 Condenser lens 147 Condenser lens 160 Ceiling-suspended structure 161 Insert nut 161a Cylinder body (cylindrical part) 161a1 Annular groove 161b First female screw portion 161c Second female screw part 161d Partition wall 161e flange portion 162 sheet metal member 162a Hole 162b Connection hole 162b1 Cylindrical portion 163 First screw 165 Connection structure 166 Second screw 167 Self-tapping structure 170 Light source side optical system 173 Condenser Lens 175 Light Tunnel 178 Condenser lens 181 Optical axis conversion mirror 183 Condenser lens 185 Irradiation mirror 190 Heat sink 195 Condenser lens 200 Color wheel device 201 Color wheel 210 Motor 220 Projection optical system 230 Lens barrel 241 Circuit board 242 control circuit board 310 air intake 320 Intake 330 Exhaust 401 Exhaust fan 402 Exhaust fan 403 Exhaust fan 500 Cooling section 510 Heat pipe 520 Heat sink 600 Cooling section 610 Heat pipe 620 Heatsink SB System Bus

Claims

1. a case outer wall made of a meltable resin material; An insert nut provided in a hole formed in the outer wall of the case and including a cylindrical portion, The insert nut has a first female screw portion formed on the inner surface of the cylindrical portion on the outer side of the case outer wall for screwing to a ceiling hanger, and a second female screw portion having a smaller nominal diameter than the first female screw portion and for screwing the first screw through a sheet metal member to which a contained body housed on the inner side of the case outer wall is connected, and a flange portion is formed, The insert nut is provided with an annular groove for engaging with the molten resin on the inner circumferential surface of the hole, a second screw is screwed from a burring-shaped connection hole formed in the sheet metal member to a boss portion standing on an inner surface of the outer wall of the case; A case characterized by the above.

2. 2. The case according to claim 1, wherein the insert nut has a partition wall formed between the first female screw portion and the second female screw portion.

3. 3. The case according to claim 1, wherein the insert nuts are provided at some of a plurality of locations screwed to the outer wall of the case via the sheet metal member.

4. A case according to any one of claims 1 to 3, A light source device; a display element that is irradiated with light from the light source device and forms image light; a projection optical system that projects the image light emitted from the display element onto a screen; a projection device control unit that controls the display element and the light source device; A projection device comprising:

5. When the insert nut is provided at one location, the location where the insert nut is provided is near the center of gravity when the device is viewed in a plan view, When the insert nuts are provided at two locations, the distance between the line connecting the two insert nuts and the center of gravity of the device in a plan view is close, 5. The projection device according to claim 4, wherein when the insert nuts are provided at three or more locations, the center of gravity of the device in a plan view is located within a range of an area connecting the respective insert nuts.

Images