JP7630224B2 - Case and Projector - Google Patents

Description

The present invention relates to a case and a projection device equipped with this case.

Cases with a ceiling suspension structure and projection devices equipped with this case have been disclosed in the past. For example, Patent Document 1 discloses a projection device equipped with a sheet metal member (metal shield) that is connected to an object to be housed, such as an optical case, housed inside the projection device case, 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. This fixing screw is a countersunk screw that screws into the female screw portion of the sheet metal member.

JP 2015-4780 A

When the projection device was installed on a ceiling and exposed to an oily environment for a long period of time, solvent cracks, a type of cracking that occurs when a solvent is added, could occur, damaging the plastic case and causing the projection device to fall.

In view of the above, the present invention aims to provide a case and a projection device that can prevent falling.

The case of the present invention comprises a case outer wall made of a meltable resin material, and an insert nut including a cylindrical portion provided in a hole formed in the case outer wall, wherein the insert nut has a first female screw portion formed on the inner surface of the cylindrical portion on the exterior 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 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 contained on the interior side of the case outer wall is connected, and a flange portion is formed, and the insert nut is provided with an annular groove for engaging with molten resin on the inner surface of the hole , and has a second screw screwed from a burring-shaped connection hole formed in the sheet metal member to a boss portion erected on the inner surface of the case outer wall .

The projection device of the present invention is characterized by 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.

The present invention provides a case and projection device that can prevent falling.

1 is an external perspective view of a projection device according to an embodiment of the present invention. FIG. 2 is a bottom view of the projection device according to the embodiment of the present invention. FIG. 2 is a diagram showing functional circuit blocks of the projection device according to the embodiment of the present invention. FIG. 2 is a schematic plan view showing the internal structure of a projection device according to an embodiment of the present invention. 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. 6 is a cross-sectional view of the projection device according to the embodiment of the present invention taken along the line VI-VI of FIG. 7 is a cross-sectional view of the projection device according to the embodiment of the present invention taken along line VII-VII of FIG. 4.

The following describes an embodiment of the present invention. As shown in Figures 1 and 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.

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

The projection image adjustment unit 15a provided on the left panel 15 side has one or more rotary knobs. Operating the rotary knob adjusts the position of the movable lens of the projection optical system 220, which will be described later in FIG. 4, and allows the size and focus of the projected image to be adjusted. The projection device 10 also has an infrared receiving unit (not shown) that receives control signals from a remote controller.

The projection device 10 has a light emitting section 12a recessed in a mortar shape at the left front corner. An air intake 310 formed of a plurality of rectangular holes is provided on the inner surface on the right side of the light emitting 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 appear and disappear 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, which includes the front panel 12 and a part of the back panel 13. An exhaust port 330 (see FIG. 4) is provided on the right panel 14.

The rear panel 13 is provided with an input/output connector section 21 that includes a USB terminal, a D-SUB terminal for inputting image signals, an S terminal, an RCA terminal, an HDMI (registered trademark) terminal, etc., and various input/output connector sections 21 such as a power adapter plug (see Figure 4).

Figure 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 to be unified into image signals of a predetermined format suitable for display, and then output to the display encoder 24.

In addition, the display encoder 24 expands and stores the input image signal in the video RAM 25, generates a video signal from the contents of the video RAM 25, and outputs it to the display driver 26.

The display driver 26 drives the display element 51, which is a spatial light modulator (SOM), at an appropriate frame rate in response to the image signal output from the display encoder 24. The projection device 10 forms an optical image with the reflected light from the display element 51 by irradiating the light beam emitted from the light source device 60 to the display element 51 via a light guide optical system, and projects and displays the image on a screen (not shown) via the projection optical system 220. The movable lens group of this projection optical system 220 can be driven by the lens motor 45 for zoom adjustment and focus adjustment.

The image compression/expansion unit 31 also performs a recording process in which the luminance signal and color difference signal of the image signal are compressed using processes such as ADCT and Huffman coding, and the data is written sequentially to a memory card 32, which is a removable recording medium. Furthermore, the image compression/expansion unit 31 reads 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.

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

The key/indicator section 37 is composed of a main key and an indicator provided on the housing. Operation signals of the key/indicator section 37 are sent directly to the control section 38. In addition, key operation signals from the remote controller are received by the Ir receiving section 35, demodulated into code signals by the Ir processing section 36, and output to the control section 38.

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

The control unit 38 controls the light source control circuit 41. This light source control circuit 41 controls the light source device 60 to emit light of a specific wavelength band required for image generation.

The control unit 38 also causes the cooling fan drive control circuit 43 to detect temperatures using multiple 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 even after the power of the projection device 10 main body is turned off using a timer, etc., or to turn off the power of the projection device 10 main body based on the results of temperature detection by the temperature sensors.

Figure 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 the optical members that constitute 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 circuit block and a light source control block. The optical case 61 and the power supply are connected and fixed to a sheet metal member 162 (see Figure 6) that serves as a metal shield and is 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) that stand on the inner surface of the bottom plate 16 and screws.

The projection device 10 is equipped with multiple exhaust fans 401-403 arranged close to the inside of the right panel 14 side of the housing. Each exhaust fan 401-403 is an axial flow fan arranged approximately parallel to the right panel 14 so as to blow air toward the exhaust port 330 side. 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.

Now, referring to FIG. 5, the configuration 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 irradiation device 70 that is a light source of blue wavelength band light and also an excitation light source, a green light source device 80 that is a light source of green wavelength band light, a red light source device 120 that 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 irradiation device 70 and a fluorescent wheel device 100.

The light source device 60 is provided with a light guide optical system 140 that guides light of each color wavelength band. The light guide optical system 140 guides the light emitted from the excitation light irradiation device 70, the green light source device 80, and the red light source device 120 to the light source side optical system 170.

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 in 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. The 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-to-rear direction of the projection device 10 (see FIG. 4).

The above-mentioned light source group 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 it to the diffusion plate 79. The diffusion plate 79 diffuses and transmits the incident blue wavelength band light to the first dichroic mirror 141 arranged on the fluorescent wheel 101 side.

The fluorescent wheel device 100 is disposed on the optical path of the excitation light emitted from the excitation light irradiation 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 a position above the fluorescent wheel 101 so as to be perpendicular to the optical axis of the emitted light from the excitation light irradiation device 70. The motor 110, disposed below the condenser lens group 111 and the condenser lens 115, drives the fluorescent wheel 101 to rotate.

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 this base material facing the excitation light irradiation device 70 is mirror-finished by silver deposition or the like. In the fluorescent light emitting region, a green phosphor layer is formed on this mirror-finished surface. The fluorescent light emitting region receives blue wavelength band light from the excitation light irradiation device 70 as excitation light and emits fluorescent light in the 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.

The transmission area of the fluorescent wheel 101 can be formed by fitting a transparent base material having translucency into a cutout portion formed in the base material of the fluorescent wheel 101. The transparent base material is made of a transparent material such as glass or resin. The transparent base material may also be provided with a diffusion layer on the surface on the side where the blue wavelength band light is irradiated or on 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 irradiation device 70 that is incident on the transmission area is transmitted or diffused through the transmission area and enters the focusing lens 115.

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

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. The heat sink 620 of the cooling unit 600, which is 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).

The light guide optical system 140 is composed of a first dichroic mirror 141, a second dichroic mirror 142, a third dichroic mirror 143, focusing lenses 145, 146, and 147 that focus the light beams, and a reflecting mirror 144 that converts the optical axis of each light beam to make it the same optical axis. Each component will be described below.

The first dichroic mirror 141 is disposed between the diffuser plate 79 and the condenser lens group 111. The first dichroic mirror 141 transmits blue wavelength band light toward the condenser lens group 111, and reflects green wavelength band light toward the condenser lens 145, converting its optical axis by 90 degrees.

The second dichroic mirror 142 is a combining means that combines 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 focused by the focusing lens 145 and enters the second dichroic mirror 142.

The green wavelength band light reflected by the second dichroic mirror 142 is focused by the focusing lens 146 and enters the third dichroic mirror 143 arranged on the left panel 15 side of the focusing 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 focused by the focusing lens 146 to the focusing lens 173, and guides the red wavelength band light and the green wavelength band light.

When the illumination area of the blue wavelength band light on the fluorescent wheel 101 is a transmission area, the blue wavelength band light emitted from the blue laser diode 71 passes through the fluorescent wheel 101, is collected by the collecting lens 115, and is then guided to the reflecting mirror 144. The reflecting mirror 144 is disposed on the optical axis of the blue wavelength band light that passes through or is 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.

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.

The focusing lens 173 is disposed on the third dichroic mirror 143 side of the light tunnel 175. The focusing lens 173 focuses the green wavelength band light, blue wavelength band light, and red wavelength band light guided from the third dichroic mirror 143. Each color wavelength band light focused by the focusing lens 173 is irradiated onto the color wheel 201 of the color wheel device 200.

The color wheel device 200 includes a color wheel 201 and a motor 210 that rotates and drives the color wheel 201. The color wheel device 200 is disposed between the condenser lens 173 and the light tunnel 175 so that the optical axis of the light beam emitted from the condenser lens 173 is perpendicular to the irradiation surface on the color wheel 201.

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 side by side 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 that enter the color wheel 201 are dimmed 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 that enters the light tunnel 175 becomes a light beam with a uniform intensity distribution within the light tunnel 175.

A condensing lens 178 is disposed on the optical axis of the light tunnel 175 on the rear panel 13 side. An optical axis conversion mirror 181 is disposed further on the rear panel 13 side of the condensing lens 178. The light beam emitted from the exit of the light tunnel 175 is condensed by the condensing lens 178, and then reflected by the optical axis conversion mirror 181 towards the left panel 15 side.

The light beam reflected by the optical axis conversion mirror 181 is focused by the focusing lens 183, and then projected by the projection mirror 185 through the condenser lens 195 onto the display element 51 at a predetermined angle. 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.

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 the 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.

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 light is incident on the condenser lens 173 via the light guide optical system 140 and is incident on the display element 51 via the light source side optical system 170. Therefore, the display element 51 displays the light of each color in a time-division manner according to the data, thereby projecting a color image on the screen.

The projection device 10 can project 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 with the connection part 16a will be described below. The connection part 16b is formed by fixing a bottomed cylindrical insert nut (not shown) with a flange at the end and a screw part to the bottom plate 16 by welding.

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. A hole 16a3 penetrating the inner and outer surfaces of the bottom plate 16 is formed in the bosses 16a1 and 16a2. An insert nut 161 is inserted into this 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 circumferential 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 circumferential surface of the hole 16a3 and fixed.

The insert nut 161 has a generally cylindrical body 161a (tubular portion). 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, thereby firmly welding and fixing the insert nut 161 to the hole portion 16a3.

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 arranged so as to face the outer surface of the bottom plate 16. In addition, 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.

A flange portion 161e is formed on the outer peripheral surface at the other end of the cylindrical body 161a (in other words, the outer peripheral surface end corresponding to the second female screw portion 161c of the insert nut 161). The flange portion 161e is received in a countersunk 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 countersunk 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 the ceiling. The 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.

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 not possible 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.

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, etc.) by the second screw 166. The inner circumferential surface of the connection hole 162b (cylindrical portion 162b1) and the inner circumferential surface of the small diameter hole portion 16c2 do not initially have a screw groove, and a self-tapping structure 167 is formed in which a screw groove 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.

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 range 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-tap 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, and the second screw 166 can be firmly screwed in.

As described above, according to the embodiment of the present invention, the case 1 includes a bottom plate 16 that is one of the outer walls of the case, and an insert nut 161 that is provided in a hole 16a3 formed in a connection portion 16a of the bottom plate 16 and includes a cylindrical body 161a (tubular 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 a second female screw portion 161c with 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.

This allows the second female screw portion 161c to be used to connect the optical case 61 or other object to be housed, and the hanger 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.

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 is used to screw the components 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 allows greater freedom in the layout of the equipment housed in the case 1.

The insert nut 161 also has a partition wall 161d between the first female screw portion 161b and the second female screw portion 161c. This reduces 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.

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

The connection structure that connects the contained body to the sheet metal member 162 includes a self-tapping structure 167 that is formed from a burring-shaped connection hole 162b formed in the sheet metal member 162 to a boss portion 16c that stands upright from 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 contained body is fixed to the bottom plate 16 and also to the sheet metal member 162.

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. Therefore, it is possible to provide a projection device 10 with improved freedom of layout of devices such as the light source device 60 and the display element 51 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 that secures 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 device can be improved.

Of the multiple locations where the case is screwed to the outer wall 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 plan view. 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 when viewed in a plan view is close, and when the insert nuts 161 are provided at three or more locations, the center of gravity of the projection device 10 when viewed in a plan view may be located within the range of the area connecting the insert nuts 161.

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 within the scope and spirit of the invention, and are included in the scope of the invention and its equivalents as set forth in the claims.

The invention described in the first claim of this application is set forth below.
[1] A case outer wall,
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 screw portion is formed on the inner surface of the cylindrical portion on the outer side of the case outer wall, and a second female screw portion having a smaller nominal diameter than the first female screw portion is 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 a contained object housed on the inner side of 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 screwed to the outer wall of the case via the sheet metal member.
[6] The case according to any one of [1] to [5],
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.

LIST OF SYMBOLS 1 Case 10 Projection device 11 Top panel 12 Front panel 12a Light output section 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 section 16a1 Boss section 16a2 Boss section 16a3 Hole section 16b Connection section 16c Boss section 16c1 Large diameter hole section 16c2 Small diameter hole section 21 Input/output connector section 22 Input/output interface 23 Image conversion section 24 Display encoder 25 Video RAM 26 Display drive section 31 Image compression/expansion section 32 Memory card 35 Ir receiving section 36 Ir processing section 37 Key/indicator section 38 Control section 41 Light source control circuit 43 Cooling fan drive control circuit 45 Lens motor 47 Audio processing section 48 Speaker 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 suspension structure 161 Insert nut 161a Cylindrical main body (tubular part)
Description of the Reference Signs 161a1 Annular groove 161b First female screw portion 161c Second female screw portion 161d Partition wall 161e Flange portion 162 Sheet metal member 162a Hole portion 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 Intake port 320 Intake port 330 Exhaust port 401 Exhaust fan 402 Exhaust fan 403 Exhaust fan 500 Cooling unit 510 Heat pipe 520 Heat sink 600 Cooling unit 610 Heat pipe 620 Heat sink SB System bus

Claims (5)

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 on the inner side of the case outer wall for screwing the first screw through 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 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 case according to claim 1, characterized in that the insert nut has a partition wall formed between the first female screw portion and the second female screw portion. 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. 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: 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.

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