JP2013029680A - Projection type display apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display apparatus able to satisfactorily protect the temperature of a power source device while restricting decrease in the reliability of a temperature protection element.SOLUTION: A power supply line SL is branched into a first line L1 and a second line L2. The first line L1 is branched into two lines, one of which is connected to an LF lamp power source 500a and the other of which is connected to an LR lamp power source 500b. Also, the second line L2 is branched into two lines, one of which is connected to an RF lamp power source 500c and the other of which is connected to an RR lamp power source 500d. An LF temperature fuse 401a and an LR temperature fuse 401b are electrically connected in series in a first line L1 before branched into two lines. An RF temperature fuse 401c and an RR temperature fuse 401d are electrically connected in series in the second line L2 before branched into two lines.

Description

  The present invention relates to a projection display device that modulates light from a light source and projects the light onto a projection surface.

  In a projection display device (hereinafter referred to as “projector”), light emitted from a light source is modulated by a light modulation element, and the modulated light (hereinafter referred to as “video light”) is projected onto a projection surface by a projection lens. Projected. For example, a lamp is used as the light source.

  In order to protect the lamp when the lamp is overheated due to factors such as deterioration of the lamp itself or deterioration of cooling performance by a cooling device that cools the lamp, a temperature protection means, for example, a temperature fuse is provided around the lamp. (See Patent Document 1). In addition to the temperature fuse, a temperature protection element such as a thermostat may be provided.

  A driving signal for driving the lamp is supplied to the lamp from a lamp power source made of ballast or the like. The temperature protection element is disposed, for example, on a power supply line from a commercial power source to a lamp power source.

  When the lamp is overheated and the temperature of the temperature protection element exceeds the set temperature, the temperature protection element is activated, the power signal from the commercial power supply device to the lamp power supply is cut off, and the lamp is forcibly stopped.

JP 2006-215138 A

  By the way, a so-called multi-lamp type projector in which a light source device is constituted by a plurality of lamps is known. In such a projector, a temperature protection element can be arranged for each lamp so as to correspond to each lamp.

  When a temperature protection element corresponding to one lamp is activated among a plurality of lamps, for example, when the cause is not the lamp itself but a decrease in cooling performance, not only the lamp but also the lamp Nearly all lamps or all lamps may overheat.

  Therefore, in order to increase the temperature protection of the light source device, in the power supply line, all temperature protection elements are electrically connected in series before the line to the lamp power supply corresponding to each lamp is branched. It is desirable that the drive signal to all the lamps is stopped when any one of the temperature protection elements is activated.

  However, in such a configuration, a current flowing through all lamp power supplies flows through each temperature protection element (N × I where I is the current flowing through one lamp power supply and N is the number of lamp power supplies). Accordingly, since a considerably large current flows through one temperature protection element, self-heating of the temperature protection element increases. In this case, since a relatively high temperature due to self-heating is added to the temperature due to the lamp, the temperature protection element is activated even though the lamp is not overheated. Malfunction may occur. Thereby, there exists a possibility that the reliability of a temperature protection element may fall.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a projection display device that can satisfactorily protect the temperature of the light source device while suppressing a decrease in reliability of the temperature protection element.

  A projection display device of the present invention includes a light source device including a first light source, a second light source, a third light source, and a fourth light source, a light modulation unit that modulates light emitted from the light source device, A drive signal for driving each light source is generated from a power signal supplied from a commercial power supply, and a first power supply, a second power supply, a third power supply, and a first power supply that supply the generated drive signals to the corresponding light sources, respectively. 4 power supplies, and a first temperature protection element, a second temperature protection element, a third temperature protection element, and a fourth temperature protection element respectively arranged around each of the light sources. Here, the power supply line through which the power signal flows is the first line through which the power signal flows to the first power source and the second power source, and the power to the third power source and the fourth power source. The signal is branched to a second line through which a signal flows. The first line is branched into two lines connected to the first power source and the second power source, respectively, and the second line is connected to the third power source and the second power source. Branches into two lines connected to each of the four power sources. The first temperature protection element and the second temperature protection element are electrically connected in series in the first line before being branched into two lines, and the first light source and the second temperature protection element The power signal flowing through the first line is cut off based on the temperature of the second light source. The third temperature protection element and the fourth temperature protection element are electrically connected in series in the second line before being branched into two lines, and the third light source and the second temperature protection element The power signal flowing in the second line is cut off based on the temperature of the light source 4.

  As each temperature protection element, for example, a thermal fuse is used.

  According to the projection display apparatus of the present invention, when either the first light source or the second light source is overheated and either the first temperature protection element or the second temperature protection element is activated, the first light source is activated. The first light source and the second light source are stopped by shutting off power signals to both the power source and the second power source. In addition, when either the third light source or the fourth light source is overheated and either the third temperature protection element or the fourth temperature protection element is activated, both the third power source and the fourth power source are used. When the power signal to is cut off, the third light source and the fourth light source are stopped.

  As described above, if a temperature abnormality is detected by one temperature protection element, the two light sources are stopped. Therefore, compared with a case where only the light source corresponding to one temperature protection element is stopped, the light temperature of the light source device is large. Protection can be achieved.

  In addition, since only one current for two power supplies flows through one temperature protection element, a temperature increase of the temperature protection element due to self-heating can be suppressed, and malfunction of the temperature protection element can be suppressed.

  The projection display device of the present invention may be configured such that the first light source and the second light source are adjacent to each other, and the third light source and the fourth light source are adjacent to each other. In this case, the first light source and the third light source face each other, and a first reflecting portion that reflects and guides light emitted from these light sources in the same direction is provided between these light sources. Further, the second light source and the fourth light source face each other, and the light emitted from these light sources is reflected between the light sources and guided in the same direction as the reflection direction by the first reflecting portion. Two reflecting portions are provided.

With such a configuration, two light sources that are simultaneously stopped by the operation of one temperature protection element are adjacent to each other, and therefore, if one light source is overheated, the other light source is easily affected. The two light sources below are used. Therefore, more effective temperature protection of the light source device can be achieved while suppressing self-heating of the temperature protection element.

  In the case of the above configuration, the first temperature protection element and the first light source and the second light source on the opposite side of the first reflection unit and the second reflection unit, and The second temperature protection elements are arranged side by side, and the third light source and the fourth light source are opposite to the first reflection unit and the second reflection unit, The temperature protection element and the fourth temperature protection element may be arranged side by side.

  With such a configuration, since two temperature protection elements connected in series are arranged close to each other, the length of the electric wire connecting the two temperature protection elements can be suppressed.

  The projection display apparatus according to the present invention may be configured to further include a plurality of cooling units for cooling the light source device. In this case, in the plurality of cooling units, the cooling capacity for the first light source and the cooling capacity for the second light source are relatively close, and the cooling capacity for the third light source and the fourth light source are relatively small. The cooling capacity is relatively close to each other.

  With such a configuration, two light sources that are simultaneously stopped by the operation of one temperature protection element are two light sources that have similar temperature environments because the cooling capabilities of these light sources are close. Therefore, more effective temperature protection of the light source device can be achieved while suppressing self-heating of the temperature protection element.

  As described above, according to the present invention, it is possible to provide a projection display device that can satisfactorily protect the temperature of the light source device while suppressing a decrease in the reliability of the temperature protection element.

  The effects and significance of the present invention will become more apparent from the following description of embodiments. However, the following embodiment is merely an example when the present invention is implemented, and the present invention is not limited to what is described in the following embodiment.

It is a figure which shows the external appearance structure of the projector which concerns on embodiment. It is a figure which shows the internal structure of the projector which concerns on embodiment. It is a figure which shows the structure of the optical system which concerns on embodiment. It is a figure which shows the structure of the light source device which concerns on embodiment. It is a figure which shows the structure of the light source device which concerns on embodiment. It is a figure which shows the structure of the lamp unit which concerns on embodiment. It is a figure which shows the structure of the thermal fuse unit which concerns on embodiment. It is a block diagram which shows the structure regarding the drive of the lamp unit which concerns on embodiment. It is a figure which shows the structure of the lamp power supply which concerns on embodiment.

  Hereinafter, a projector according to an embodiment will be described with reference to the drawings.

<Overall configuration of projector>
FIG. 1 is a diagram showing an external configuration of a projector. The projector according to the present embodiment includes four lamp units, and is a so-called four-lamp type large projector.

  Referring to FIG. 1, the projector includes a main body cabinet 1 having a substantially rectangular parallelepiped shape. The main body cabinet 1 includes a lower cabinet 2 and an upper cabinet 3 that covers the lower cabinet 2 from above.

  A projection window 4 is formed at the center of the front surface of the upper cabinet 3, and the front surface of the projection lens 5 is exposed to the outside through the projection window 4.

  The upper cabinet 3 is provided with a main cover 6 that covers the main opening from the front surface to the upper surface. The main opening is provided for exchanging the projection lens 5 and the prism unit and adjusting the polarizing plate and the like. Four lamp covers 7 that respectively cover the four lamp openings are provided on the upper rear portion of the upper cabinet 3. Each lamp opening is provided above each lamp unit in order to replace each lamp unit.

  Further, an input / output terminal portion 8 is provided on the right side surface of the upper cabinet 3. Various AV terminals are arranged in the input / output terminal unit 8, and an AV (Audio Visual) signal is input through the AV terminal.

  Two handles 9 are provided on each of the left and right side surfaces of the lower cabinet 2. The handle 9 is used when carrying the projector.

  FIG. 2 is a diagram showing the internal structure of the projector, and shows a state where the upper cabinet 3 is removed.

  Referring to FIG. 2, a light source device 10 and an optical system 11 that generates image light by modulating light emitted from the light source device 10 are arranged in the lower cabinet 2.

  The light source device 10 is arranged at the rear part of the lower cabinet 2. The optical system 11 is disposed in front of the light source device 10. The optical system 11 is arranged in the lower cabinet 2, and the prism unit 12 is arranged in the optical system 11 so that it can be attached and detached from above. Detailed configurations of the light source device 10 and the optical system 11 will be described later.

  A projection lens 5 is disposed in front of the optical system 11. The projection lens 5 enlarges the image light generated by the optical system 11 and projects it onto a projection surface such as a screen.

  A first lamp power supply device 13 is disposed on the left side of the optical system 11, and a second lamp power supply device 14 is disposed on the right side of the light source device 10. The first lamp power supply device 13 includes two lamp power supplies that supply electric power to the two front and rear lamp units, respectively. The second lamp power supply device 14 includes two lamp power supplies that supply electric power to the two front and rear lamp units, respectively.

  A main power supply device 15 is disposed in front of the second lamp power supply device 14. The main power supply 15 supplies power to electrical components (such as a liquid crystal panel) that constitute the optical system 11, the control board 17, and the like.

  A filter unit 16 including a noise filter is disposed below the second lamp power supply device 14. AC power from the commercial power supply is supplied to the first lamp power supply device 13, the second lamp power supply device 14, and the main power supply device 15 through the filter unit 16.

A control board 17 is disposed above the optical system 11. The control board 17 is provided with a control circuit for controlling electrical components such as a liquid crystal panel and a lamp unit. In FIG. 2, the control board 17 is indicated by a broken line so that the optical system 11 can be seen.

  The light source device 10 includes a first exhaust unit 18 and a second exhaust unit 19 disposed on the rear side of the light source device 10. The first exhaust unit 18 and the second exhaust unit 19 are supplied to the four lamp units from the first cooling unit and the second cooling unit, which will be described later, and suck in the cooling air warmed by cooling the lamp unit to the outside. Discharge.

  A first power supply cooling fan 20 is disposed in front of the first lamp power supply device 13. The first power supply cooling fan 20 blows air to the rear first lamp power supply device 13 to cool the first lamp power supply device 13. A second power supply cooling fan 21 is arranged between the second lamp power supply device 14 and the main power supply device 15. When the second power supply cooling fan 21 operates, the air taken into the main body cabinet 1 passes through the main power supply device 15 as cooling air and is sucked into the second power supply cooling fan 21. Further, the cooling air sent from the second power supply cooling fan 21 is supplied to the second lamp power supply device 14. Thereby, the main power supply device 15 and the second lamp power supply device 14 are cooled.

  The cooling air from the first power supply cooling fan 20 passes through the first lamp power supply device 13 and is also supplied to the two lamp units on the left side of the light source device 10. Therefore, in the light source device 10, the cooling capacity for the two left lap units is slightly higher than the cooling capacity for the two right lamp units.

  In other words, the arrangement of the first cooling unit, the second cooling unit, the first exhaust unit 18, the second exhaust unit 19 and the first power supply cooling fan 20 involved in the light source device 10 provides a cooling capacity for the two lamp units on the left side. The cooling capacity for the two lamp units on the right side is relatively close. On the other hand, the cooling capacity for the two left lamp units and the cooling capacity for the two right lamp units are relatively far from each other.

<Configuration of optical system>
FIG. 3 is a diagram showing the configuration of the optical system 11.

  As shown in FIG. 3, the optical system 11 includes a light guide optical system 101, three transmissive liquid crystal panels 102, 103, and 104, and a dichroic prism 105. Note that polarizing plates (not shown) are arranged on the incident side and the emission side of the liquid crystal panels 102, 103, and 104.

  White light emitted from the light source device 10 enters the light guide optical system 101. The light guide optical system 101 includes a fly eye integrator, a PBS array, a condenser lens, a dichroic mirror, a plane mirror, a relay lens, and the like. White light incident on the light guide optical system 101 includes light in a red wavelength band (hereinafter referred to as “R light”), light in a green wavelength band (hereinafter referred to as “G light”), and light in a blue wavelength band (hereinafter referred to as “G light”). Hereinafter, the liquid crystal panels 102, 103, and 104 are irradiated with the light. The R light, G light, and B light modulated by the liquid crystal panels 102, 103, and 104 are color-combined by the dichroic prism 105 and emitted as video light. The liquid crystal panels 102, 103, 104 and the dichroic prism 105 are integrated to form a prism unit 12.

  As the light modulation element constituting the optical system 11, a reflective liquid crystal panel or a MEMS device can be used in addition to the transmissive liquid crystal panels 102, 103, and 104. Further, instead of the three-plate optical system including the three light modulation elements as described above, for example, a single-plate optical system using one light modulation element and a color wheel may be used.

<Configuration of light source device>
4 and 5 are diagrams showing the configuration of the light source device 10. 4 is a perspective view of the light source device 10 viewed from the front oblique direction, and FIG. 5 is a perspective view of the light source device 10 viewed from the rear oblique direction.

  4 and 5, the light source device 10 includes a lamp mounting unit 200 fixed to the lower cabinet 2 and four lamp units 300 mounted on the lamp mounting unit 200.

  The lamp mounting unit 200 includes a housing 210, two mirror members 220, four first UV cut members 230, and a second UV cut member 240.

  The housing 210 is made of a resin material, and includes two mirror arrangement portions 211 arranged in the center and four lamp housing portions 212 formed on both sides of the mirror arrangement portion 211. The bottom surface of the front mirror arrangement portion 211 is lower than the bottom surface of the rear mirror arrangement portion 211. Further, the bottom surfaces of the left and right two lamp housing portions 212 are set lower than the bottom surfaces of the rear left and right two lamp housing portions 212. A mirror member 220 is disposed in the mirror placement portion 211, and the lamp unit 300 is mounted in the lamp housing portion 212. The upper part of the mirror arrangement part 211 is covered with a mirror cover (not shown) after the mirror member 220 is arranged.

  The mirror member 220 has a configuration in which a flat mirror 222 formed in a V shape is attached to the front surface of a base member 221 formed in a V shape. The mirror member 220 reflects the light emitted from the lamp unit 300 and guides it forward.

  The first UV cut member 230 includes a UV cut glass 231 that blocks the passage of ultraviolet rays. Each first UV cut member 230 is disposed between each lamp housing portion 212 and the corresponding mirror arrangement portion 211.

  The second UV cut member 240 is UV cut glass that blocks the passage of ultraviolet rays, and is arranged in front of the front mirror arrangement portion 211. The height of the second UV cut member 240 is set so as to be higher than the optical path of light reflected by the rear mirror member 220 and traveling forward.

  FIG. 6 is a diagram illustrating a configuration of the lamp unit 300. FIG. 6A is a perspective view of the lamp unit 300 as viewed from the front oblique direction. FIG. 6B is a perspective view of the lamp unit 300 as viewed from the rear oblique direction.

  Referring to FIG. 6, the lamp unit 300 includes a lamp 310 and a lamp holder 320 that holds the lamp 310. The lamp 310 includes an arc tube 311 that emits white light and a reflector 312 that reflects white light emitted from the arc tube 311. For the lamp 310, for example, an ultra-high pressure mercury lamp, a xenon lamp or the like is used.

  The lamp holder 320 is made of a resin material, and includes a holder main body 321 and a bottom plate 322. An exit window 323 through which light from the lamp 310 is emitted is formed on the front surface of the holder body 321. A heat-resistant glass plate 324 is fitted into the exit window 323. The holder main body 321 has an open bottom, and the lamp 310 is mounted from below. A bottom plate 322 is attached to the front half of the bottom surface of the holder main body 321, and the bottom portion of the lamp 310 is supported by the bottom plate 322.

A handle 325 is provided on the upper surface of the holder body 321. The handle 325 is used when the lamp unit 300 is carried or attached to or detached from the lamp mounting unit 200.

  Returning to FIG. 4 and FIG. 5, in the state where the four lamp units 300 are incorporated in the lamp mounting unit 200, the left and right two front and rear lamp units 300 are adjacent to each other. The left and right lamp units 300 in the front row are opposed to each other with the front mirror member 220 interposed therebetween, and the left and right lamp units 300 in the rear row are opposed to each other with the rear mirror member 220 interposed therebetween.

  When the projector is operated, light is emitted from each lamp unit 300. As shown in FIG. 4, the light emitted from each lamp unit 300 passes through the corresponding first UV cut member 230, and at that time, the ultraviolet rays are removed. And the light which passed each 1st UV cut member 230 is reflected ahead of the light source device 10 by the mirror member 220 corresponding to each lamp unit 300, and is synthesize | combined into one light. At this time, the front two lamp units 300 are arranged at a position lower than the rear two lamp units 300. For this reason, the light from the rear lamp unit 300 is not blocked by the front lamp unit 300. The synthesized light passes through the second UV cut member 240, and ultraviolet rays are further removed. In this way, the light from the four lamp units 300 is combined, and thus the light source device 10 emits light with high luminance.

  On the rear surface of the lamp mounting unit 200, a first exhaust unit 18 is attached to the left side, a second exhaust unit 19 is attached to the right side, and a third exhaust unit 22 is attached to the center. Further, on the bottom surface of the lamp mounting unit 200, a first cooling unit 23 is attached on the left side, and a second cooling unit 24 is attached on the right side.

  The first cooling unit 23 includes two cooling fans respectively corresponding to the front and rear lamp housing portions 212, and the cooling air sent from these cooling fans is supplied to the corresponding lamp housing portions 212. Thereby, the left and right two lamp units 300 on the left side are cooled.

  The second cooling unit 24 includes two cooling fans respectively corresponding to the front and rear lamp housing portions 212, and the cooling air sent from these cooling fans is supplied to the corresponding lamp housing portions 212. Thereby, the front and rear two lamp units 300 are cooled.

  In the first exhaust unit 18, two exhaust fans 18a and 18b are arranged in two upper and lower stages. The upper exhaust fan 18a sucks the cooling air warmed by cooling the lamp unit 300 in the left rear lamp housing portion 212 and discharges it to the outside. Further, the lower exhaust fan 18b sucks the cooling air warmed by cooling the lamp unit 300 in the left front lamp housing portion 212 through the duct 250 and discharges it to the outside.

  In the second exhaust unit 19, two exhaust fans 19a and 19b are arranged in two upper and lower stages. The upper exhaust fan 19a sucks the cooling air warmed by cooling the lamp unit 300 in the right rear lamp housing portion 212 and discharges it to the outside. The lower exhaust fan 19b sucks the cooling air warmed by cooling the lamp unit 300 in the right front lamp housing portion 212 through the duct 260 and discharges it outside.

  The third cooling unit 22 is provided with an exhaust fan 22a. The exhaust fan 22a sucks air in the front and rear mirror arrangement portions 211 and discharges it to the outside. As a result, new air is introduced into the mirror arrangement portion 211, and the mirror member 220 is cooled by the introduced air.

  A thermal fuse unit 400 corresponding to each lamp unit 300 is disposed in the vicinity of the side wall 212 a of each lamp housing portion 212. The two left and right thermal fuse units 400 on the left side are mounted on mounting plates 251 formed on the front side and the rear side of the duct 250. The two right and left thermal fuse units 400 on the right side are mounted on mounting plates 261 formed on the front side and the rear side of the duct 260.

  That is, the two left and right thermal fuse units 400 (thermal fuses) on the left side are arranged in the front and rear direction on the opposite side of the front and rear mirror members 220 with respect to the two front and rear lamp units 300. The two right and left thermal fuse units 400 (thermal fuses) on the right side are arranged on the opposite side to the front and rear mirror members 220 with respect to the two front and rear lamp units 300 so as to be lined up and down.

  A relay unit 270 is attached to each of the mounting plates 251 and 261 so as to be adjacent to the thermal fuse unit 400. Electric wires from the lamp power supply devices 13 and 14 side and electric wires from the lamp unit 300 side are relayed by the relay unit 270.

  FIG. 7 is a diagram illustrating a configuration of the thermal fuse unit 400. The thermal fuse unit 400 includes a thermal fuse 401 and a fuse holder 402 in which the thermal fuse 401 is accommodated. In the fuse holder 402, openings are formed on the upper surface and the front surface to accommodate the temperature fuse 401, and these openings are covered with a holder cover 403.

  The thermal fuse 401 is disposed on an AC power supply line from the filter unit 16 to the lamp power supply devices 13 and 14. When the lamp unit 300 is overheated for some reason, such as the cooling performance of the first cooling unit 23 and the second cooling unit 24 is lowered, and the temperature of the temperature fuse 401 exceeds the set temperature, the temperature fuse 401 is blown. As a result, AC power is not supplied to the lamp power supply devices 13 and 14, so that power supply to the lamp unit 300 is cut off.

<Configuration for driving the lamp unit>
FIG. 8 is a block diagram showing a configuration relating to driving of the lamp unit 300.

  Hereinafter, for convenience of description, when the lamp units 300 are individually specified, the left front lamp unit 300 illustrated in FIG. 5 is referred to as an LF lamp unit 300a. Similarly, the left rear, right front, and right rear lamp units 300 are referred to as an LR lamp unit 300b, an RF lamp unit 300c, and an RR lamp unit 300d, respectively. Further, the thermal fuses 401 corresponding to the LF lamp unit 300a, the LR lamp unit 300b, the RF lamp unit 300c, and the RR lamp unit 300d are referred to as an LF temperature fuse 401a, an LR temperature fuse 401b, an RF temperature fuse 401c, and an RR temperature fuse 401d, respectively. Called. FIG. 8 shows names and symbols for individually specifying the lamp unit 300 and the thermal fuse 401.

  As described with reference to FIG. 2, the first lamp power supply device 13 includes an LF lamp power supply 500a corresponding to the LF lamp unit 300a and an LR lamp power supply 500b corresponding to the LR lamp unit 300b. The second lamp power supply device 14 includes an RF lamp power source 500c corresponding to the RF lamp unit 300c and an RR lamp power source 500d corresponding to the RR lamp unit 300d.

  A power plug PL provided on the projector is connected to a commercial power source. An AC power signal is supplied from a commercial power source.

  A power supply line SL for supplying an AC power signal from the commercial power supply to each of the lamp power supplies 500a to 500d is branched into a first line L1 and a second line L2 at a first branch point P1.

  The first line L1 is branched into two lines at the second branch point P2, and the branched lines are connected to the LF lamp power source 500a and the LR lamp power source 500b, respectively. The second line L2 is branched into two lines at the third branch point P3, and the branched lines are connected to the RF lamp power source 500c and the RR lamp power source 500d, respectively.

  The filter unit 16 includes two noise filters 601 and 602. The noise filter 601 is arranged on the first line L1, and removes noise included in the AC power signal flowing through the first line L1. The noise filter 602 is arranged on the second line L2, and removes noise included in the AC power signal flowing through the second line L2.

  On the first line L1 between the noise filter 601 and the second branch point P2, the LF temperature fuse 401a and the LR temperature fuse 401b are arranged so as to be electrically connected in series. Further, an RF temperature fuse 401c and an RR temperature fuse 401d are arranged in a second line L2 between the noise filter 602 and the third branch point P3 so as to be electrically connected in series.

  FIGS. 9A and 9B are diagrams showing configurations of the lamp power supplies 500a to 500d.

  As shown in FIG. 9A, in the first lamp power supply device 13, a power factor correction unit 510, an LF ballast unit 530a, and an LR ballast unit 530b are arranged.

  The power factor correction unit 510 includes a substrate 511. On the substrate 511, an LF power factor correction circuit 540a, an LR power factor correction circuit 540b, an input side connector 512, and two output side connectors 513 and 514 are mounted. The input side connector 512 is connected to the electric wire (first line L1) from the LR temperature fuse 401b. The input side connector 512 and the LF power factor correction circuit 540a and the LR power factor correction circuit 540b are connected by a conductive pattern formed on the substrate 511. A second branch point P2 is formed by branching the conductive pattern in the middle. The LF power factor correction circuit 540a and the output side connector 513 are connected by a conductive pattern, and the LR power factor improvement circuit 540b and the output side connector 514 are also connected by a conductive pattern. An electric wire from the LF ballast unit 530a is connected to the output side connector 513, and an electric wire from the LR ballast unit 530b is connected to the output side connector 514.

  The LF lamp power source 500a includes an LF power factor correction circuit 540a and an LF ballast unit 530a, and the LR lamp power source 500b includes an LR power factor improvement circuit 540b and an LR ballast unit 530b.

  As shown in FIG. 9B, a power factor correction unit 520, an RF ballast unit 530c, and an RR ballast unit 530d are disposed in the second lamp power supply device 14.

The power factor correction unit 520 includes a substrate 521. On the substrate 521, an RF power factor correction circuit 540c, an RR power factor correction circuit 540d, an input connector 522, and two output connectors 523 and 524 are mounted. The input side connector 522 is connected to the electric wire (second line L2) from the RR temperature fuse 401d. The input side connector 522, the RF power factor correction circuit 540c, and the RR power factor correction circuit 540d are connected by a conductive pattern formed on the substrate 521. A third branch point P3 is formed by branching the conductive pattern in the middle. The RF power factor correction circuit 540c and the output side connector 523 are also connected by a conductive pattern, and the RR power factor improvement circuit 540d and the output side connector 524 are also connected by a conductive pattern. The output side connector 523 is connected to the electric wire from the RF ballast unit 530c, and the output side connector 524 is connected to the electric wire from the RR ballast unit 530d.

  The RF lamp power source 500c includes an RF power factor correction circuit 540c and an RF ballast unit 530c, and the RR lamp power source 500d includes an RR power factor correction circuit 540d and an RR ballast unit 530d.

  The power factor improvement circuits 540a to 540d improve the power factor seen from the commercial power source side by making the current waveform similar to the voltage waveform and bringing the current waveform close to a sine wave. Also, the AC power signal is converted into a DC power signal and output to the corresponding ballast units 530a to 530d.

  The ballast units 530a to 530d convert the DC power signals input from the power factor correction circuits 540a to 540d into rectangular AC power signals suitable for driving the lamp units 300a to 300d (lamps 310), and the converted AC power signals. Is supplied as a drive signal to the corresponding lamp units 300a to 300d to drive the lamp units 300a to 300d.

  In such a configuration, when the LF lamp unit 300a or the LR lamp unit 300b is overheated, the LF temperature fuse 401a or the LR temperature fuse 401b is blown. Since the LF temperature fuse 401a and the LR temperature fuse 401b are connected in series in the first line L1, an AC power signal to both the LF lamp power source 500a and the LR lamp power source 500b if one of the temperature fuses is blown. Is cut off. Thereby, both the LF lamp unit 300a and the LR lamp unit 300b are stopped.

  When the RF lamp unit 300c or the RR lamp unit 300d is overheated, the RF temperature fuse 401c or the RR temperature fuse 401d is blown. Since the RF temperature fuse 401c and the RR temperature fuse 401d are connected in series in the second line L2, if one of the temperature fuses is blown, an AC power signal to both the RF lamp power source 500c and the RR lamp power source 500d is generated. Blocked. Thereby, both the RF lamp unit 300c and the RR lamp unit 300d are stopped.

<Effects of the present embodiment>
As described above, according to the present embodiment, if a temperature abnormality is detected by one temperature fuse 401, two lamp units 300 are stopped, and therefore only the lamp unit 300 corresponding to one temperature fuse 401 is stopped. Compared to the case, it is possible to protect the light source device 10 with a warm temperature.

  In addition, since only one lamp power supply current flows through one thermal fuse 401, a temperature rise of the thermal fuse 401 due to self-heating can be suppressed, and malfunction of the thermal fuse 401 can be suppressed.

  Therefore, the light source device 10 can be well protected while suppressing a decrease in the reliability of the thermal fuse 401.

  In addition, according to the present embodiment, two lamp units 300 that are stopped simultaneously when one thermal fuse 401 is blown out are two lamp units 300 of an LF lamp unit 300a and an LR lamp unit 300b, and an RF lamp unit. Two lamp units 300, 300c and RR lamp unit 300d, are set. These two lamp units 300 are adjacent to each other in the light source device 10, and if one lamp unit 300 is overheated, the other lamp unit 300 is easily affected. In addition, these two lamp units 300 have similar temperature environments because the cooling capacities of these lamp units 300 are close.

  Therefore, by combining the lamp unit 300 that is stopped simultaneously when one thermal fuse 401 is blown, the temperature of the light source device 10 is more effectively protected while suppressing the self-heating of the thermal fuse 401. be able to.

  Furthermore, according to the present embodiment, the LF temperature fuse 401a (the left front temperature fuse unit 400) and the LR temperature fuse 401b (the left rear temperature fuse unit 400) connected in series are arranged in the vicinity of the left side surface of the lamp mounting unit 200. It is arranged to line up. Further, the RF temperature fuse 401c (the right front temperature fuse unit 400) and the RR temperature fuse 401d (the right rear temperature fuse unit 400) connected in series are arranged in the vicinity of the right side surface of the lamp mounting unit 200. .

  Therefore, the length of the electric wire connecting the LF temperature fuse 401a and the LR temperature fuse 401b can be suppressed, and the length of the electric wire connecting the RF temperature fuse 401c and the RR temperature fuse 401d can be suppressed.

<Others>
Although the present embodiment has been described above, the present invention is not limited to the above embodiment, and the embodiment of the present invention can be variously modified in addition to the above embodiment. is there.

  For example, in the above embodiment, the thermal fuse 401 is used as the temperature protection element. However, the present invention is not limited to this. For example, a thermostat may be used.

  In the above embodiment, the lamp power supplies 500a and 500b of the LF lamp unit 300a and the LR lamp unit 300b arranged on the left side of the light source device 10 are connected to the commercial power supply through the first line L1, and the lamp unit 300a. , 300b respectively corresponding to LF temperature fuse 401a and LR temperature fuse 401b are connected in series in the first line L1. Further, the lamp power supplies 500c and 500d of the RF lamp unit 300c and the RR lamp unit 300d arranged on the right side of the light source device 10 are connected to the commercial power supply through the second line L2, and correspond to the lamp units 300c and 300d, respectively. The RF temperature fuse 401c and the RR temperature fuse 401d are connected in series in the second line L2.

However, the present invention is not limited to this. For example, the lamp power supplies 500a and 500d of the LF lamp unit 300a and the RR lamp unit 300d arranged at diagonal positions in the light source device 10 are connected to the commercial power supply by the first line L1. The LF temperature fuse 401a and the RR temperature fuse 401d respectively corresponding to the lamp units 300a and 300d may be connected in series in the first line L1. In this case, the lamp power supplies 500b and 500c of the LR lamp unit 300b and the RF lamp unit 300c arranged at the other diagonal position are connected to the commercial power supply by the second line L2, and are connected to the lamp units 300b and 300c. Corresponding LR temperature fuse 401b and RF respectively
A thermal fuse 401c is connected in series in the second line L2.

  With such a configuration, for example, even if the LF temperature fuse 401a or the RR temperature fuse 401d is blown and both the LF lamp unit 300a and the RR lamp unit 300d are stopped, the LR lamp unit 300b at the diagonal position is stopped. Further, by continuing the lighting of the RF lamp unit 300c, it is possible to continue the projection operation while suppressing the luminance unevenness of the image generated by using only some of the lamp units 300 as much as possible.

  Further, in the above-described embodiment, the cooling capacity for the two front and rear lamp units 300 on the left side and the cooling capacity for the two front and rear lamp units 300 on the right side are relatively far from each other. However, a configuration may be adopted in which a plurality of cooling devices are arranged in the main body cabinet 1 so that the cooling capacities for the four lamp units 300 are all close to each other.

  Furthermore, the projector of the above embodiment is a so-called four-lamp type projector provided with four lamp units 300, but may be a multi-lamp type projector other than four lamps.

  Furthermore, in the above embodiment, the light source device 10 is configured by the lamp unit 300 using the lamp light source, but the light source device 10 may be configured by a light source unit using an LED light source or a laser light source.

  In addition, the embodiment of the present invention can be variously modified as appropriate within the scope of the technical idea shown in the claims.

10 Light source device 18 First exhaust unit (cooling section)
19 Second exhaust unit (cooling section)
20 1st power supply cooling fan (cooling part)
23 1st cooling unit (cooling part)
24 Second cooling unit (cooling section)
102, 103, 104 Liquid crystal panel (light modulator)
220 Mirror member (first reflection part, second reflection part)
300a LF lamp unit (first light source)
300b LR lamp unit (second light source)
300c RF lamp unit (third light source)
300a RR lamp unit (fourth light source)
401a LF thermal fuse (first temperature protection element)
401b LR temperature fuse (second temperature protection element)
401c RF temperature fuse (third temperature protection element)
401d RR temperature fuse (fourth temperature protection element)
500a LF lamp power supply (first power supply)
500b LR lamp power supply (second power supply)
500c RF lamp power supply (third power supply)
500d RR lamp power supply (fourth power supply)
SL power supply line L1 first line L2 second line

Claims (5)

A light source device including a first light source, a second light source, a third light source, and a fourth light source;
A light modulator that modulates the light emitted from the light source device;
A drive signal for driving each light source is generated from a power signal supplied from a commercial power supply, and a first power supply, a second power supply, a third power supply, and a first power supply that supply the generated drive signals to the corresponding light sources, respectively. 4 power supplies,
A first temperature protection element, a second temperature protection element, a third temperature protection element, and a fourth temperature protection element respectively arranged around each of the light sources;
With
The power supply line through which the power signal flows flows a first line through which the power signal flows to the first power source and the second power source, and a power line to the third power source and the fourth power source. Branch to the second line,
The first line is branched into two lines connected to the first power source and the second power source, respectively, and the second line is divided into the third power source and the fourth power source. Branched into two lines connected to each of the power supplies,
The first temperature protection element and the second temperature protection element are electrically connected in series in the first line before being branched into two lines, and the first light source and the second temperature protection element Based on the temperature of the light source, cut off the power signal flowing in the first line,
The third temperature protection element and the fourth temperature protection element are electrically connected in series in the second line before being branched into two lines, and the third light source and the fourth temperature protection element Blocking the power signal flowing in the second line based on the temperature of the light source;
A projection display device characterized by that. The projection display device according to claim 1,
The first light source and the second light source are adjacent to each other, and the third light source and the fourth light source are adjacent to each other.
The first light source and the third light source are opposed to each other, and a first reflecting portion is provided between the light sources to reflect the light emitted from the light sources and guide the light in the same direction.
The second light source and the fourth light source face each other, and between these light sources, the light emitted from these light sources is reflected and guided in the same direction as the reflection direction by the first reflecting portion. A reflective part is provided,
A projection display device characterized by that. The projection display device according to claim 2,
The first temperature protection element and the second temperature protection element are arranged on a side opposite to the first reflection part and the second reflection part with respect to the first light source and the second light source. Placed in
The third temperature protection element and the fourth temperature protection element are arranged on the side opposite to the first reflection part and the second reflection part with respect to the third light source and the fourth light source. Arranged in the
A projection display device characterized by that. The projection display device according to claim 1,
A plurality of cooling units for cooling the light source device;
The plurality of cooling units are:
The cooling capacity for the first light source and the cooling capacity for the second light source are relatively close,
The cooling capacity for the third light source and the cooling capacity for the fourth light source are relatively close,
Arranged so that,
A projection display device characterized by that. The projection display device according to any one of claims 1 to 4,
Each temperature protection element includes a thermal fuse,
A projection display device characterized by that.

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