JP4678248B2 - Light source device and image display device - Google Patents

Description

  The present invention relates to a light source device and an image display device, and more particularly to a technology of a light source device provided in an image display device that displays an image using laser light.

  In recent years, a laser projector using laser light has been proposed as an image display device for displaying an image. Laser light is characterized by high monochromaticity and directivity. For this reason, the laser projector has an advantage that an image with good color reproducibility can be obtained. In order to display an image by scanning with laser light, a high-power laser light source is used. In a laser projector, display is performed by scanning laser light at high speed and diffusing it with a screen. By sealing the laser light source in the housing, only the laser light with dispersed intensity can be supplied to the outside of the housing. Therefore, while displaying a bright image, it is possible to prevent a laser beam having an intensity greater than a predetermined intensity, which is considered dangerous, from being emitted outside the casing. Techniques for avoiding a situation in which a laser beam having an intensity greater than a predetermined intensity is emitted outside the housing are proposed in, for example, Patent Documents 1, 2, and 3.

Japanese Patent Laid-Open No. 11-153763 JP-A-6-91924 JP 2001-267670 A

  As a case where a laser beam having a high intensity is emitted outside the housing, for example, a case where an abnormality that stops the scanning of the laser beam has occurred can be considered. According to the technique disclosed in Patent Document 1, it is possible to stop the supply of laser light when an abnormality occurs in scanning. When laser light with high intensity is emitted outside the case, abnormalities may occur in the scanning of the laser light, as well as diversion or misuse of solid-state light emitting elements taken out by disassembly of the light source device. Conceivable. In the technique disclosed in Patent Document 2, it is possible to stop the power supply to the laser diode at the same time as removing the laser diode, which is a solid state light emitting device, but to connect a newly prepared power supply to the laser diode. Thus, there is a possibility of oscillating the laser beam. Patent Document 3 proposes a technique for preventing laser light oscillation by removing a laser resonator and simultaneously destroying a structure that satisfies the laser oscillation condition. Since this technique destroys the external resonator structure, it cannot be applied to an edge-emitting semiconductor laser or a surface-emitting laser that does not have an external resonator structure. As described above, in the conventional technique, there is a problem that it is difficult to sufficiently prevent the laser light from being emitted by the solid-state light emitting element taken out by disassembling the light source device. The present invention has been made in view of the above-described problems, and provides a light source device and an image display device that can reliably prevent light oscillation that may occur by taking out a solid light emitting element from the light source device. The purpose is to do.

  In order to solve the above-described problems and achieve the object, according to the present invention, a light source device that supplies light from a solid light emitting element, the solid light emitting element is moved so as to be removed from the light source device A light source device characterized by having a voltage generation unit that generates a voltage to be applied to the solid state light emitting element in conjunction with the operation can be provided.

  When the solid light emitting element is removed from the light source device, a voltage is generated in the voltage generating unit in conjunction with the movement of the solid light emitting element. When the voltage generator and the solid light emitting element are electrically connected in a state where a predetermined voltage, for example, a voltage capable of destroying the solid light emitting element is generated in the voltage generating unit, the solid light emitting element is caused by overcurrent. fall into disrepair. By removing the solid light emitting element from the light source device and damaging the solid light emitting element at the same time, it becomes possible to reliably prevent laser light oscillation by the solid light emitting element taken out from the light source device. Thereby, it is possible to obtain a light source device capable of reliably preventing light oscillation that may occur when the solid light emitting element is taken out of the light source device.

  Further, according to a preferred aspect of the present invention, it is desirable that the voltage generating unit includes a piezoelectric element. Piezoelectric elements have the property of generating charges in a specific axial direction when pressure is applied in the crystal axial direction. By using the piezoelectric phenomenon of the piezoelectric element, the voltage generator can generate a voltage to be applied to the solid state light emitting element.

  According to a preferred aspect of the present invention, it is desirable to have a compression unit that compresses the piezoelectric element in conjunction with the movement of the solid state light emitting element. When the compression unit is used, the piezoelectric element can be compressed by a force for moving the solid state light emitting element. The light source device can generate a voltage in conjunction with the movement of the solid state light emitting device by using the compression unit.

  Further, as a preferred aspect of the present invention, the compression unit includes a movable part provided adjacent to the piezoelectric element, a fixed part provided on the side opposite to the side where the movable part is provided with respect to the piezoelectric element, It is desirable to compress the piezoelectric element between the movable part and the fixed part by moving the movable part in the direction of the fixed part in conjunction with the movement of the solid state light emitting element. By moving the movable portion, the piezoelectric element provided between the movable portion and the fixed portion can be compressed.

  Moreover, as a preferable aspect of the present invention, it is desirable that the movable portion is provided so as to rotate in conjunction with the movement of the solid state light emitting device. In such a configuration, it is possible to compress the piezoelectric element by using a lever with the rotation axis as a fulcrum, the position where the solid light emitting element is provided as a power point, and the position where the piezoelectric element is provided as an action point. For this reason, the force applied to the solid-state light emitting element can be effectively used as the force for compressing the piezoelectric element.

  Moreover, as a preferable aspect of the present invention, it is desirable that the piezoelectric element is compressed by a movable portion that has an elastic member connected to the movable portion and rotates using the restoring force of the elastic member. By using a hammer mechanism that strikes the piezoelectric element using a movable portion that is rotated by the restoring force of the elastic member, a large compressive force can be instantaneously applied to the piezoelectric element. For this reason, a large voltage can be applied to the solid state light emitting device at the same time that the solid state light emitting device is taken out from the light source device, and the solid state light emitting device can be more reliably damaged.

  Further, as a preferred aspect of the present invention, the voltage generator has a contact portion provided in contact with the solid light emitting element, and generates static electricity by friction between the solid light emitting element and the contact portion. desirable. By using static electricity generated by friction between the solid light emitting element and the contact portion, the voltage generating unit can generate a voltage to be applied to the solid light emitting element.

  As a preferred embodiment of the present invention, it is desirable that the voltage generator has a capacitor. For example, by connecting a solid light emitting element and a capacitor in parallel, the capacitor is charged together with the supply of current to the solid light emitting element. By adopting a configuration in which current is supplied from the capacitor to the solid state light emitting element in conjunction with the movement of the solid state light emitting element, the voltage generated by the voltage generator can be applied to the solid state light emitting element.

  Moreover, as a preferable aspect of the present invention, it is desirable to have a switch unit that stops the supply of current to the solid state light emitting device and at the same time disconnects the connection between the solid state light emitting device and the capacitor. Accordingly, the capacitor is charged when supplying a current to the solid state light emitting device. Further, by stopping the supply of current in the solid state light emitting device and simultaneously disconnecting the connection between the solid state light emitting device and the capacitor, the capacitor can be maintained in a charged state. Accordingly, it is possible to generate a voltage to be applied to the solid state light emitting element at the same time as the solid state light emitting element moves regardless of whether or not current is supplied to the solid state light emitting element.

  Moreover, as a preferable aspect of the present invention, it is desirable to have a connection part that electrically connects the voltage generating part and the solid state light emitting element in conjunction with the movement of the solid state light emitting element. Thereby, the voltage generated by the voltage generator can be applied to the solid state light emitting device.

  In a preferred embodiment of the present invention, the solid state light emitting device is desirably a semiconductor laser. By using the semiconductor laser, the light source device can supply laser light that can be easily modulated. Further, the semiconductor laser can be damaged by a voltage that is generated by a piezoelectric element or the like that is a voltage generating unit.

  Furthermore, according to the present invention, it is possible to provide an image display device including the light source device described above. By providing the light source device described above, it is possible to prevent light oscillation that may occur by taking out the solid light emitting element from the light source device. As a result, an image display device capable of preventing light oscillation that may occur by taking out the solid state light emitting device from the housing can be obtained.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a schematic configuration of an image display apparatus 100 according to Embodiment 1 of the present invention. The image display device 100 is a so-called rear projector that supplies laser light to one surface of the screen 110 and observes an image by observing light emitted from the other surface of the screen 110. A light source device 101 provided in the image display device 100 supplies laser light from a solid-state light emitting element described later.

  The laser light from the light source device 101 enters the scanning unit 200 after passing through the illumination optical system 102. The scanning unit 200 scans the laser light from the light source device 101 in the two-dimensional direction of the X direction and the Y direction. The scanning unit 200 is not limited to the configuration in which the laser beam is scanned in the two-dimensional direction by a single mirror, and is configured to use a mirror that scans the laser beam in the X direction and a mirror that scans the laser beam in the Y direction. Also good. The light from the scanning unit 200 enters the reflection unit 105 after passing through the projection optical system 103. The illumination optical system 102 and the projection optical system 103 image the laser light from the light source device 101 on the screen 110.

  The reflection unit 105 reflects the laser light from the scanning unit 200 toward the screen 110. The housing 107 seals the space inside the housing 107. The screen 110 is provided on a predetermined surface of the housing 107. The screen 110 is a transmissive screen that transmits laser light modulated in accordance with an image signal. The light from the reflection unit 105 enters from the surface of the screen 110 on the inner side of the housing 107 and then exits from the surface on the viewer side. An observer observes the image by observing light emitted from the screen 110.

  FIG. 2 shows a schematic configuration of the light source device 101. The light source device 101 includes an R light source 201R for supplying red light (hereinafter referred to as “R light”), and a G light source 201G for supplying green light (hereinafter referred to as “G light”). Blue light (hereinafter referred to as “B light”). ) For supplying B light. The R light source unit 201R is a semiconductor laser that is a solid-state light emitting element that supplies R light. The light source unit 201B for B light is a semiconductor laser that is a solid-state light emitting element that supplies B light.

  The G light source unit 201 </ b> G includes a semiconductor laser 202 and a wavelength conversion element 203. As the wavelength conversion element 203, for example, an SHG (second harmonic generation) element including a nonlinear optical crystal can be used. The G light source unit 201G converts the laser beam from the semiconductor laser 202 into a laser beam having a half wavelength by the wavelength conversion element 203 and emits the laser beam. The light source unit 201G for G light supplies G light having a wavelength spectrum having a peak at 520 nm by using the semiconductor laser 202 having a wavelength spectrum having a peak at 1040 nm, for example.

  By using the wavelength conversion element 203, the G light source unit 201G can use a general-purpose semiconductor laser 202 that can be easily obtained. The light source part 201G for G light is not limited to the one described above as long as it supplies G light. The G light source unit 201G may use, for example, a DPSS (Diode Pumped Solid State) laser oscillator. The DPSS laser oscillator supplies laser light by exciting a solid crystal using laser light from a laser light source.

  Each color light source unit 201R, 201G, 201B supplies laser light modulated in accordance with an image signal. As the modulation according to the image signal, either amplitude modulation or pulse width modulation may be used. The light source device 101 is provided with two dichroic mirrors 204 and 205. The dichroic mirror 204 transmits R light and reflects G light. The dichroic mirror 205 transmits R light and G light and reflects B light. The R light from the R light source unit 201 </ b> R passes through the dichroic mirrors 204 and 205 and is then emitted from the light source device 101.

  The G light from the G light source unit 201G is reflected by the dichroic mirror 204, whereby the optical path is bent by approximately 90 degrees. The G light reflected by the dichroic mirror 204 passes through the dichroic mirror 205 and is then emitted from the light source device 101. The B light from the B light source unit 201B is reflected by the dichroic mirror 205, whereby the optical path is bent by approximately 90 degrees. The B light reflected by the dichroic mirror 205 is emitted from the light source device 101. In this way, the light source device 101 supplies R light, G light, and B light modulated according to the image signal.

  FIG. 3 illustrates a circuit configuration for driving the R light source unit 201R. The R light source unit 201R, the semiconductor laser 202, and the B light source unit 201B are all provided with the same configuration. In the present embodiment and the following embodiments, the configuration provided for the R light source unit 201R will be described as a representative example. The first terminal 310 and the second terminal 311 provided in the R light source unit 201 </ b> R are connected to a power source 315. The first terminal 311 is connected to the ground electrode 314.

On the substrate 301 on which the R light source unit 201R is provided, in addition to the R light source unit 201R, a piezoelectric element 302 is provided. Examples of the piezoelectric element 302 include lithium tantalate (LiTaO ₃ ) and lithium niobate (LiNbO ₃ ) that are single crystal elements, PZT-based materials (PbTiO ₃ —PbZrO ₃ ) that are polycrystalline ceramic elements, and barium titanate. (BaTiO ₃ ) or the like can be used. The piezoelectric element 302 has a property that charges are generated in a specific axial direction when pressure is applied in the crystal axial direction. By utilizing such a piezoelectric phenomenon, the piezoelectric element 302 generates a voltage to be applied to the R light source unit 201R that is a solid state light emitting element.

  The piezoelectric element 302 is provided on the substrate 301. The substrate 301 is a movable part provided adjacent to the piezoelectric element 302 on the lower side. A fixed portion 303 is formed on the upper side of the piezoelectric element 302 opposite to the side on which the substrate 301 is provided. The fixing unit 303 is firmly fixed to the light source device 101 so as not to be broken even if the R light source unit 201R is moved so as to remove the R light source unit 201R from the light source device 101. The piezoelectric element 302 is provided between a substrate 301 that is a movable part and a fixed part 303.

  A first wiring 312 and a second wiring 313 are connected to two electrodes (not shown) provided on the piezoelectric element 302. The second wiring 313 is connected to the second terminal 311 that is connected to the ground electrode 314. Further, the end of the first wiring 312 opposite to the side connected to the piezoelectric element 302 is cut off at the end 316. The end 316 is fixed to the first terminal 310 with a slight gap, for example, a distance of 1 millimeter.

  Consider a case in which the R light source 201R is moved in the direction of the arrow, which is the R light emission direction, so that the R light source 201R is removed from the state shown in FIG. When a force is applied to the R light source unit 201R so as to remove the R light source unit 201R from the light source device 101, the substrate 301 is interlocked with the movement of the R light source unit 201R as shown by the arrows in FIG. Moves in the direction of the fixed portion 303. Since the fixed portion 303 does not move while the substrate 301 moves, the piezoelectric element 302 is compressed by the movement of the substrate 301. The substrate 301 that is a movable portion and the fixed portion 303 are compression portions that compress the piezoelectric element 302 in conjunction with the movement of the R light source 201R that is a solid light emitting element.

  The piezoelectric element 302 generates a voltage by using a compression action by the substrate 301 and the fixing portion 303. As described above, the piezoelectric element 302 that is a voltage generation unit interlocks with the movement of the R light source unit 201 </ b> R so as to remove the R light source unit 201 </ b> R that is a solid light emitting element from the light source device 101. A voltage to be applied to the light source unit 201R is generated. The voltage generated in the piezoelectric element 302 increases as the amount of deformation of the piezoelectric element 302 caused by lifting the R light source 201R increases.

  Also, as shown in FIG. 4, the electrical connection between the first terminal 310 and the power source 315 is cut by lifting the R light source unit 201 </ b> R. For example, the connection between the first terminal 310 and the power source 315 is cut off by lifting the R light source unit 201 </ b> R so that the first terminal 310 is pulled out from the wiring connected to the power source 315. Can do. Further, when the voltage generated in the piezoelectric element 302 increases and discharge occurs between the end 316 and the first terminal 310, the piezoelectric element 302, the R light source unit 201R, and the ground electrode 314 are electrically connected. Connected.

  The piezoelectric element 302, the R light source unit 201R, and the ground electrode 314 are electrically connected in a state where the electrical connection between the first terminal 310 and the power source 315 is disconnected, so that the piezoelectric element 302 is connected. Is applied to the R light source unit 201R. The light source unit for R light 201R is damaged by an overcurrent by being connected to the piezoelectric element 302 that generates a voltage that generates a discharge between the end 316 and the first terminal 310.

  If the voltage for driving the R light source unit 201R is several volts, the R light source unit 201R has, for example, a voltage of about 10 volts in the forward direction and several tens of volts in the reverse direction. Damaged by application. By adopting a configuration capable of applying a voltage sufficient to damage the R light source unit 201R by the movement of the R light source unit 201R, the R light source unit 201R is taken out from the light source device 101 and at the same time the laser light It is possible to reliably prevent emission. Thereby, there is an effect that it is possible to reliably prevent the emission of laser light that may occur by taking out the solid light emitting element from the light source device 101.

  Note that by lifting the R light source unit 201R, not only the connection between the first terminal 310 and the power source 315 is disconnected, but also the connection between the second terminal 311 and the power source 315 is disconnected. It is good also as a structure. Also in this configuration, it is possible to apply a voltage generated by the piezoelectric element 302 to the R light source unit 201R by electrical connection with the piezoelectric element 302 and the R light source unit 201R.

  The light source device 101 of this embodiment can easily supply laser light modulated for displaying an image by using a semiconductor laser that is a solid-state light emitting element. Further, by using a semiconductor laser, it is possible to be damaged by a voltage generated at the piezoelectric element 302. The light source device 101 may be configured to use other solid-state light emitting elements such as a solid-state laser, a light-emitting diode element (LED), an EL element, and the like, in addition to using a semiconductor laser.

  FIG. 5 illustrates a light source device according to the second embodiment of the present invention, and shows a circuit configuration for driving the R light source unit 201R. The light source device according to this embodiment can be applied to the image display device 100 according to the first embodiment. The same parts as those of the light source device 101 of the first embodiment are denoted by the same reference numerals, and redundant description is omitted. The light source device of this embodiment includes a substrate 501 provided to be rotatable around a rotation shaft 505.

  On the substrate 301, the R light source unit 201 </ b> R is provided on one side with respect to the rotation shaft 505, whereas the piezoelectric element 302 is on the lower side of the substrate 301 and is connected to the rotation shaft 505. On the other hand, it is provided on the opposite side to the side on which the R light source unit 201R is provided. The substrate 501 is a movable part provided adjacent to the piezoelectric element 302. The piezoelectric element 302 is disposed on the fixed portion 502. Also in this embodiment, the piezoelectric element 302 is provided between the substrate 501 that is a movable part and the fixed part 303.

  The first wiring 312 connected to the piezoelectric element 302 is cut off at the end 512. The first terminal 310 provided in the R light source unit 201 </ b> R is provided with a route that is branched from the route connected to the power source 315. The end 511 is provided at the tip of the branching portion of the first terminal 310. In a state before the R light source unit 201R is moved, the end portion 511 and the end portion 512 are arranged so as to be separated from each other.

  A hinge portion 504 that connects the R light source unit 201R and the substrate 501 is provided at a position near the outer edge of the substrate 501 in the joint portion between the R light source unit 201R and the substrate 501. In addition, a hinge portion 503 that connects the piezoelectric element 302 and the substrate 501 is provided at a position in the vicinity of the outer edge portion of the substrate 501 in a joint portion between the piezoelectric element 302 and the substrate 501.

  Here, it is assumed that a force is applied to the R light source unit 201R so as to lift the R light source unit 201R while the position of the rotation shaft 505 is fixed. When the light source unit for R light 201R is lifted, the light source unit for R light 201R moves in the direction of the arrow, which is the emission direction of the R light, while being joined to the substrate 501 by the hinge unit 504. While a force to be lifted is applied to a portion of the substrate 501 where the hinge portion 504 is provided, a force to be pushed down is applied to the side of the substrate 501 where the other hinge portion 503 is provided.

  In this manner, the substrate 501 rotates about the rotation shaft 505 so that the side on which the hinge portion 503 is provided moves downward as indicated by an arrow in FIG. Since the fixed portion 502 does not move while the substrate 501 rotates, the piezoelectric element 302 is compressed by the rotation of the substrate 501. The substrate 501 that is a movable part and the fixed part 502 are compression parts that compress the piezoelectric element 302 in conjunction with the movement of the R light source part 201R that is a solid light emitting element. By providing the hinge portions 503 and 504, the force for moving the R light source portion 201R can be efficiently transmitted to the piezoelectric element 302 by utilizing the rotation of the substrate 501. Note that the hinges 503 and 504 may be omitted as long as the force for moving the R light source 201R can be efficiently transmitted to the piezoelectric element 302.

  The electrical connection between the first terminal 310 and the power source 315 is disconnected by lifting the R light source unit 201R. Further, when the first terminal 310 is lifted in conjunction with the R light source unit 201 </ b> R, the end portion 511 provided in the first terminal 310 is replaced with the end portion 512 provided in the first wiring 312. Move in the direction. When the first terminal 310 is lifted, the end portion 511 and the end portion 512 come into contact with each other, whereby the piezoelectric element 302 and the R light source unit 201R are electrically connected. The end portions 511 and 512 are connection portions that electrically connect the piezoelectric element 302 that is a voltage generation unit and the R light source unit 201R in conjunction with the movement of the R light source unit 201R that is a solid light emitting element. is there. For example, a guide for guiding the end 511 to the position of the end 512 may be provided in order to bring the end 511 and the end 512 into contact with the movement of the R light source 201R.

  The piezoelectric element 302, the R light source unit 201R, and the ground electrode 314 are electrically connected in a state where the electrical connection between the first terminal 310 and the power source 315 is disconnected, so that the piezoelectric element 302 is connected. Is applied to the R light source unit 201R. In this manner, similarly to the first embodiment, it is possible to reliably prevent laser light from being emitted by the solid-state light emitting element taken out from the light source device. In the present embodiment, the piezoelectric element 302 is compressed using a lever having the rotation shaft 505 as a fulcrum, the position of one hinge 504 as a force point, and the position of the other hinge 503 as an action point. For this reason, it is possible to effectively use the force applied to one hinge portion 504 as a force for pushing down the other hinge portion 503. Note that the end portion 511 and the end portion 512 are not brought into contact with each other, and similarly to the first embodiment, a voltage is applied to the R light source unit 201R using the discharge between the end portions 511 and 512. May be applied. Further, in the first embodiment, similarly to the present embodiment, a connection portion that electrically connects the piezoelectric element 302 and the R light source portion 201R may be provided.

  FIG. 7 illustrates a light source device according to the first modification of the present embodiment, and illustrates a configuration for compressing the piezoelectric element 302 by moving the R light source unit 201R. The light source device of this modification is characterized in that an R light source unit 201R is provided on a side surface of a substrate 501. A hinge portion 504 that connects the light source portion for R light 201R and the substrate 501 is provided at a joint portion between the rear surface of the light source portion for R light 201R and the substrate 501. As shown in FIG. 8, also in the case of this modification, the piezoelectric element 302 can be compressed using the force that lifts the R light source 201R.

  In the case of this modification, it is easy to make the distance between the rotating shaft 505 and the hinge portion 504 smaller than the distance between the rotating shaft 505 and the hinge portion 503. As the distance between the rotation shaft 505 and the hinge portion 504 is made smaller than the distance between the rotation shaft 505 and the hinge portion 503, the piezoelectric element 302 is used by using a force that moves the R light source portion 201R. The amount of compression can be increased. Accordingly, it is possible to supply a large voltage to the R light source unit 201R with respect to slight movement of the R light source unit 201R.

  FIG. 9 illustrates a light source device according to the second modification of the present embodiment, and illustrates a configuration for compressing the piezoelectric element 302 by moving the R light source unit 201R. The light source device of this modification has a hammer mechanism that strikes the piezoelectric element 302 using a substrate 501 that is rotated by a restoring force of a spring 901 that is an elastic member. One end of the spring 901 is fixed at a position below the substrate 501. The other end of the spring 901 is connected to the back surface of the substrate 501 and in the vicinity of the outer edge on the side where the R light source 201R is provided.

  The piezoelectric element 302 is bonded to a fixing portion 303 on the side opposite to the side on which the substrate 501 is provided with respect to the piezoelectric element 302. The piezoelectric element 302 is disposed between the substrate 501 which is a movable portion and the fixed portion 303 and at a position away from the substrate 501. The R light source unit 201R is provided on the back surface of the substrate 501 so as to be in contact with a position near the outer edge.

  When the R light source unit 201R is moved in the direction of the arrow in FIG. 9 by bringing the R light source unit 201R into contact with the substrate 501, the substrate 501 rotates about the rotation axis 505 as shown in FIG. Move. In the case of this modification, the piezoelectric element 302 is not compressed when the substrate 501 rotates with the movement of the R light source unit 201R. The force that lifts the side of the substrate 501 on which the R light source 201R is provided is used as a force that stretches the spring 901.

  Further, when the R light source unit 201R is separated from the substrate 501 by lifting the R light source unit 201R, the substrate 501 is reversed in the reverse direction by the restoring force of the spring 901 as shown in FIG. Rotate instantly. The substrate 501 strikes the piezoelectric element 302 in the vicinity of the outer edge on the side opposite to the side where the spring 901 is provided by instantaneously rotating using the restoring force of the spring 901. The piezoelectric element 302 is compressed at the moment it is hit by the substrate 501.

  By applying a striking force to the piezoelectric element 302 using such a hammer mechanism, it is possible to momentarily apply a large compressive force to the piezoelectric element 302. For this reason, a large voltage can be applied to the R light source unit 201R at the same time that the R light source unit 201R is taken out of the light source device, and the R light source unit 201R can be more reliably damaged. Note that the piezoelectric element 302 may be provided at a position where the piezoelectric element 302 can be strongly hit by the substrate 501. For example, in the state illustrated in FIG. 9, the piezoelectric element 302 may be provided at a position where the piezoelectric element 302 contacts the substrate 501. The spring 901 may be provided at a position other than the position described in this modified example, for example, the rotating shaft 505. Further, instead of the spring 901, another elastic member may be used.

  FIG. 12 illustrates a light source device according to the third embodiment of the present invention, and illustrates a circuit configuration for driving the R light source unit 201R. The light source device according to this embodiment can be applied to the image display device 100 according to the first embodiment. The same parts as those of the light source device 101 of the first embodiment are denoted by the same reference numerals, and redundant description is omitted. The light source device of this embodiment is characterized in that static electricity is generated between the R light source unit 201R and the cylindrical unit 1201.

  The cylindrical part 1201 is a cylindrical structure having an inner diameter substantially the same as the outer diameter of the R light source part 201R. The cylindrical part 1201 is an abutting part provided so as to abut on the R light source part 201R which is a solid light emitting element. The cylindrical portion 1201 can be formed of, for example, a Teflon (registered trademark) member. The light source unit for R light 201 </ b> R is disposed at the bottom of the cylindrical unit 1201. The side of the cylindrical portion 1201 opposite to the side where the R light source 201R is provided is open to the outside of the cylindrical portion 1201. Light from the R light source unit 201 </ b> R passes through the inside of the cylindrical part 1201 from the bottom of the cylindrical part 1201 and then exits to the outside of the cylindrical part 1201.

  The wiring 1203 drawn from the inner surface of the cylindrical portion 1201 to the outside of the cylindrical portion 1201 is cut off at the end portion 1212. The first terminal 310 provided in the R light source unit 201 </ b> R is provided with a route that is branched from the route connected to the power source 310. The end 1211 is provided at the tip of the branching portion of the first terminal 310. In a state before the R light source unit 201R is moved, the end portion 1211 and the end portion 1212 are arranged so as to be separated from each other.

  Assume that the R light source unit 201R is moved in the direction of the arrow, which is the emission direction of the R light, so that the R light source unit 201R is removed from the state shown in FIG. Since the surface of the R light source unit 201R is made of a metal, for example, an aluminum member, static electricity is generated by friction between the R light source unit 201R and the cylindrical portion 1201. The cylindrical portion 1201 that is a contact portion is a voltage generating portion that generates static electricity by friction between the light source portion for R light 201R that is a solid light emitting element and the cylindrical portion 1201. The cylindrical portion 1201 that is a voltage generating portion generates a voltage in conjunction with the movement of the R light source unit 201R so as to remove the R light source unit 201R from the light source device.

  As illustrated in FIG. 13, the electrical connection between the first terminal 310 and the power source 315 is disconnected by pulling out the R light source unit 201 </ b> R. Further, when the first terminal 310 is lifted in conjunction with the R light source unit 201 </ b> R, the end 1211 provided on the first terminal 310 moves in the direction of the end 1212 provided on the wiring 1203. To do. When the first terminal 310 is lifted, the end portion 1211 and the end portion 1212 come into contact with each other, whereby the inner surface of the cylindrical portion 1201 and the light source portion for R light 201R are electrically connected. The end portions 1211 and 1212 are connection portions that electrically connect the cylindrical portion 1201 that is a voltage generation portion and the R light source portion 201R in conjunction with the movement of the R light source portion 201R that is a solid light emitting element. is there.

  When the electrical connection between the first terminal 310 and the power source 315 is disconnected, the cylindrical part 1201, the R light source part 201R, and the ground electrode 314 are electrically connected, so that the cylindrical part 1201 is connected. Is applied to the R light source unit 201R. In this manner, similarly to the first embodiment, it is possible to reliably prevent laser light from being emitted by the solid-state light emitting element taken out from the light source device. Also in this embodiment, the voltage generated in the cylindrical portion 1201 may be applied to the R light source unit 201R using the discharge between the end portions 1211 and 1212.

  The cylindrical portion 1201 is not limited to a configuration using a Teflon (registered trademark) member. The cylindrical part 1201 may be configured to use a member that can efficiently generate static electricity by friction with the R light source part 201 </ b> R made of a metal member. For example, since the metal member constituting the surface of the R light source unit 201R is easily positively charged, it is desirable to select a member that is easily negatively charged as the member constituting the cylindrical portion 1201. Furthermore, the contact portion is not limited to the configuration using the cylindrical portion 1201 and may be any shape that can generate static electricity by friction with the R light source portion 201R. For example, a configuration using a plate-like abutting portion formed so as to be abuttable with the R light source unit 201R may be employed.

  FIG. 14 illustrates a light source device according to Embodiment 4 of the present invention, and shows a circuit configuration for driving the R light source unit 201R. The light source device according to this embodiment can be applied to the image display device 100 according to the first embodiment. The same parts as those of the light source device 101 of the first embodiment are denoted by the same reference numerals, and redundant description is omitted. The light source device of this embodiment includes a capacitor 1401 that is electrically connected to a power source 315.

  The capacitor 1401 is connected in parallel with the R light source unit 201R. A switch unit 1410 is provided between the capacitor 1401 and the R light source unit 201R. The switch unit 1410 electrically connects the power source 315 and the capacitor 1401 when the power source 315 supplies current to the R light source unit 201R. Thereby, the current is supplied to the capacitor 1401 at the same time as the current is supplied to the light source unit for R light 201R. The capacitor 1401 is charged by the current from the power source 315 when the R light source unit 201R and the capacitor 1401 are connected.

  Further, the switch unit 1410 stops the supply of current to the R light source unit 201R by the power source 315, and at the same time, disconnects the connection between the R light source unit 201R and the capacitor 1401, as shown in FIG. . Thus, the switch unit 1410 switches between connection and disconnection in conjunction with the presence or absence of current supply to the R light source unit 201R. Since the connection between the R light source unit 201R and the capacitor 1401 is cut off, the electric charge accumulated in the capacitor 1401 is stored in the capacitor 1401 without flowing to the R light source unit 201R. Therefore, as long as the R light source unit 201R is driven in the light source device, no current is supplied from the capacitor 1401 to the R light source unit 201R.

  The wiring from two electrodes (not shown) of the capacitor 1401 is provided with a path branched from the path connected to the power source 315. The end portions 1411 and 1412 are respectively formed at the tips of the branched portions. Assume that the R light source 201R is removed from the state shown in FIG. 14 where the R light source 201R supplies the R light, as shown in FIG. As the R light source unit 201R is lifted, the electrical connection between the first terminal 310 and the power source 315 and between the second terminal 311 and the power source 315 is disconnected. In addition, the first terminal 310 and the second terminal 311 are lifted in conjunction with the R light source unit 201R, so that the first terminal 310 and the second terminal 311 have an end portion 1411 and an end portion 1412, respectively. Move in the direction of. When the first terminal 310 and the second terminal 311 are lifted, the end portion 1411 and the first terminal 310 are brought into contact with each other, and the end portion 1412 and the second terminal 311 are brought into contact with each other, whereby the capacitor 1401 has an R light source. It is electrically connected to the part 201R.

  Furthermore, while the R light source unit 201R is removed, the switch unit 1410 is switched to cut off the connection as shown in FIG. When the capacitor 1401 and the R light source unit 201R are connected and the connection is cut off by the switch unit 1410, a closed circuit including the R light source unit 201R and the capacitor 1401 is formed. In this manner, the R light source unit 201R is removed, and the voltage generated by the capacitor 1401 is applied to the R light source unit 201R.

  When the R light source 201R is removed from the state shown in FIG. 15 where the supply of the R light by the R light source 201R is stopped, as shown in FIG. 16, the voltage generated by the capacitor 1401 is reduced. The light can be applied to the R light source unit 201R. Therefore, it is possible to reliably prevent laser light from being emitted by the solid-state light emitting element extracted from the light source device regardless of whether the R light source unit 201R is ON / OFF. The connection between the switch unit 1410 and the light source unit 201R is disconnected at the same time as the R light source unit 201R is removed, and the wiring between the capacitor 1401 and the power source 315 is disconnected at the same time as the R light source unit 201R is removed. It is good also as a structure.

  The light source device of the present invention is applied to other devices other than the image display device 100, for example, electronic devices such as a laser printer and a barcode reader, and a variety of devices mounted on a vehicle such as a measuring device for preventing a collision. It may be used.

  As described above, the light source device according to the present invention is useful when using light from a solid state light emitting device, and is particularly suitable for use in an image display device that displays an image using laser light.

1 is a diagram illustrating a schematic configuration of an image display apparatus according to Embodiment 1 of the present invention. The figure which shows schematic structure of a light source device. The figure explaining the circuit structure for driving the light source part for R light. The figure explaining the state which moved the light source part for R lights. The figure explaining the light source device which concerns on Example 2 of this invention. The figure explaining the state which moved the light source part for R lights. FIG. 10 is a diagram illustrating a light source device according to a first modification of the second embodiment. The figure explaining the state which moved the light source part for R lights. FIG. 6 is a diagram illustrating a light source device according to a second modification of the second embodiment. The figure explaining the state which moved the light source part for R lights. The figure explaining the state which moved the light source part for R lights further. FIG. 6 is a diagram illustrating a schematic configuration of a projector according to a third embodiment of the invention. The figure explaining the state which moved the light source part for R lights. The figure explaining the light source device which concerns on Example 4 of this invention. The figure explaining the state which stopped supply of the electric current to the light source part for R light by a power supply. The figure explaining the state which moved the light source part for R lights from the state shown in FIG. The figure explaining the state which moved the light source part for R lights from the state shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 Image display apparatus, 101 Light source apparatus, 102 Illumination optical system, 103 Projection optical system, 105 Reflection part, 107 Housing | casing, 110 Screen, 200 Scanning part, 201RR light source part, 201G G light source part, 201B B Light source unit for light, 202 Semiconductor laser, 203 Wavelength conversion element, 204, 205 Dichroic mirror, 301 Substrate, 302 Piezoelectric element, 303 Fixing part, 310 First terminal, 311 Second terminal, 312 First wiring, 313 Second wiring, 314 Ground electrode, 315 power supply, 316 end, 501 substrate, 502 fixed part, 503, 504 hinge part, 511, 512 end part, 901 spring, 1201 cylindrical part, 1203 wiring part, 1211, 1212 end part 1401 Capacitor 1410 Switch part 1411 1 12 end

Claims (12)

A light source device for supplying light from a solid state light emitting device,
A light source device comprising: a voltage generation unit that generates a voltage to be applied to the solid state light emitting device in conjunction with the movement of the solid state light emitting device so as to remove the solid state light emitting device from the light source device.   The light source device according to claim 1, wherein the voltage generation unit includes a piezoelectric element.   The light source device according to claim 2, further comprising a compression unit that compresses the piezoelectric element in conjunction with the movement of the solid state light emitting element.   The compression part includes a movable part provided adjacent to the piezoelectric element, and a fixed part provided on the opposite side of the piezoelectric element from the side on which the movable part is provided. The light source device according to claim 3, wherein the piezoelectric element is compressed by moving the movable part toward the fixed part in conjunction with the movement of the light emitting element.   The light source device according to claim 4, wherein the movable portion is provided to rotate in conjunction with the movement of the solid state light emitting device.   The light source device according to claim 5, further comprising: an elastic member connected to the movable portion, wherein the piezoelectric element is compressed by the movable portion that rotates using a restoring force of the elastic member.   The said voltage generation part has an abutting part provided in contact with the said solid light emitting element, and generates static electricity by friction with the said solid light emitting element and the said abutting part. The light source device according to 1.   The light source device according to claim 1, wherein the voltage generation unit includes a capacitor.   The light source device according to claim 8, further comprising a switch unit that stops a current supply to the solid state light emitting element and simultaneously disconnects the connection between the solid state light emitting element and the capacitor.   The light source according to claim 1, further comprising a connection portion that electrically connects the voltage generation unit and the solid state light emitting device in conjunction with movement of the solid state light emitting device. apparatus.   The light source device according to claim 1, wherein the solid-state light emitting element is a semiconductor laser.   An image display device comprising the light source device according to claim 1.

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