JP4946737B2 - Light source device, illumination device, monitor device, and image display device - Google Patents

Description

  The present invention relates to a light source device, an illumination device, a monitor device, and an image display device, and more particularly, to a technology of a light source device that emits laser light.

  In recent years, a technique using a laser light source as a light source device of an image display device has been proposed. Compared with a UHP lamp conventionally used as a light source device for an image display device, a laser light source has advantages such as high color reproducibility, instant lighting, and long life. The laser light source is designed to prevent leakage of laser light from an unexpected part to the outside by sealing a semiconductor element or the like that emits light in a package. For example, in the technique proposed in Patent Document 1, in a laser light source that introduces generated laser light into an optical fiber, the optical fiber is housed in a metal package so that the laser light due to damage to the optical fiber is reduced. Prevent leakage.

JP 2004-212522 A

  By using an external resonator that resonates light, the light source device can narrow the wavelength of the laser light and increase the output of the laser light. Within the resonator structure that resonates the light, there is light having a higher energy density than the laser light emitted outside the package. Since high energy density light exists in the package, high energy density light may leak if the package breaks. As a laser light source, one that emits harmonic light whose wavelength is converted by a wavelength conversion element is known. By using the wavelength conversion element, it is possible to supply laser light having a desired wavelength and a sufficient amount of light using a general-purpose light-emitting element that can be easily obtained. In general, a light source device that emits visible light as harmonic light uses infrared light as fundamental wave light. In the case of infrared light, evacuation by a repelling reaction is more difficult than in the case of visible light, and leakage of high-power infrared light may cause problems that cause discomfort to the human body, particularly the eyes. The technique of Patent Document 1 has a problem in that not only the optical fiber but also the package is damaged, so that light with a high energy density may leak. The present invention has been made in view of the above-described problems, and a light source device capable of preventing leakage of light having a high energy density and ensuring high safety when a package of the light source device is damaged, and illumination using the light source device An object is to provide a device, a monitor device, and an image display device.

  In order to solve the above-described problems and achieve the object, a light source device according to the present invention is formed so as to form a light source unit that emits light, a package that houses at least the light source unit, and a package. And the emission of light from the light source unit is stopped when the package wiring unit is disconnected.

  When the package is damaged, the package wiring portion is disconnected at the damaged portion of the package. By using the package wiring part, the emission of light from the light source part can be stopped together with the breakage of the package. Thereby, when the package is broken, a light source device capable of preventing leakage of light having a high energy density and ensuring high safety can be obtained.

  In addition, as a preferable aspect of the present invention, a disconnection detection unit that detects disconnection of the package wiring unit is provided, and the disconnection detection unit may stop driving the light source unit when the disconnection of the package wiring unit is detected. desirable. Thereby, the emission of light from the light source unit can be stopped in accordance with the breakage of the package.

  Moreover, as a preferable aspect of the present invention, the package desirably includes a first structure in which the light source unit is disposed and a second structure in which the package wiring unit is disposed. Thereby, the emission of light from the light source unit can be stopped according to the breakage of the second structure.

  Moreover, as a preferable aspect of the present invention, it is desirable that the package has a connecting lead for connecting the package wiring part and the disconnection detecting part, and the connecting lead is arranged in the first structure. Thereby, the disconnection of the package wiring part can be detected by the disconnection detection part.

  Moreover, as a preferable aspect of the present invention, it is desirable that the second structure body has a joint portion formed so as to be capable of being joined to the first structure body, and an end portion of the package wiring portion is arranged at the joint portion. . Thereby, a package wiring part and a disconnection detection part can be easily connected by joining of a 1st structure and a 2nd structure.

  As a preferred aspect of the present invention, the light source unit emits light of the first wavelength, converts the wavelength of the first wavelength of light emitted from the light source unit, and has a second wavelength different from the first wavelength. A wavelength conversion element that emits light of a wavelength; a wavelength selective transmission unit that is provided at a position where light from the wavelength conversion element of the package is incident, reflects light of the first wavelength, and transmits light of the second wavelength; The pattern of the package wiring portion has an interval in the region where the first wavelength light reflected by the wavelength selective transmission portion of the package is incident is larger than the interval in the region other than the region where the first wavelength light is incident. It is desirable to form it small. Thereby, the detection resolution of the package breakage can be enhanced at a portion where the light with the first wavelength is likely to be incident, and the leakage of the light with the first wavelength can be effectively prevented.

  Moreover, as a preferable aspect of the present invention, a wavelength conversion element that converts the wavelength of light emitted from the light source unit, a temperature measurement unit that measures the temperature of the wavelength conversion element, and a wavelength based on a measurement result by the temperature measurement unit, It is desirable that the package wiring unit is connected to at least one of the temperature measuring unit and the temperature adjusting unit. Thereby, at least one of the measurement by the temperature measurement unit and the temperature adjustment by the temperature adjustment unit can be stopped due to breakage of the package.

  According to a preferred aspect of the present invention, the package wiring portion includes a first wiring layer and a second wiring layer disposed on the side where the light source portion is provided with respect to the first wiring layer. It is desirable that the pattern in the first wiring layer and the pattern in the second wiring layer are substantially orthogonal to each other. By making the pattern in the first wiring layer and the pattern in the second wiring layer substantially orthogonal to each other, it is possible to increase the detection resolution of the package breakage. Thereby, leakage of light can be effectively prevented.

  Moreover, as a preferable aspect of the present invention, it is desirable that the second structure is configured using a ceramic member. By using the second structure formed of the ceramic member that is an insulating member, unnecessary conduction between the package wiring portions can be cut off.

  Moreover, as a preferable aspect of the present invention, it is desirable that the second structure is configured by using a metal member and has an insulating layer provided between the second structure and the package wiring portion. By using the second structure made of a metal member, the package can be made inexpensive and strong. By using the insulating layer, unnecessary conduction between the package wiring portions can be cut off.

  Furthermore, an illumination device according to the present invention includes the light source device described above, and illuminates an object to be irradiated using light from the light source device. By using the above light source device, it is possible to prevent leakage of light having a high energy density and to ensure high safety. Thereby, the illuminating device which can ensure high safety | security can be obtained.

  Furthermore, a monitor device according to the present invention includes the above-described illumination device and an imaging unit that captures an image of a subject illuminated by the illumination device. By using the lighting device described above, high safety can be ensured. Thereby, a monitor device capable of ensuring high safety can be obtained.

  Furthermore, an image display device according to the present invention includes the light source device described above, and displays an image using light from the light source device. By using the above light source device, it is possible to prevent leakage of light having a high energy density and to ensure high safety. Thereby, an image display device capable of ensuring high safety 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 a light source device 10 according to Embodiment 1 of the present invention. The light source device 10 is a semiconductor laser that emits laser light. The semiconductor element 11 is a light source unit that emits fundamental light having a first wavelength, and is, for example, a surface-emitting type semiconductor element. The fundamental light is, for example, infrared light. The first wavelength is, for example, 1064 nm. The optical prism 13 is disposed on the prism base 12. The optical prism 13 has a right triangular side surface. The optical prism 13 is configured by bonding two triangular prisms that bisect the right triangle. A dichroic film 14 is formed on the joint surface of the two triangular prisms. The dichroic film 14 transmits light having a first wavelength and reflects light having a second wavelength that is different from the first wavelength.

The second-harmonic generation (SHG) element 15 is disposed on the SHG element base 16. The SHG element 15 is a wavelength conversion element that converts the wavelength of the fundamental wave light of the first wavelength from the semiconductor element 11 and emits the harmonic light of the second wavelength. The harmonic light is, for example, visible light. The second wavelength is half the first wavelength and is, for example, 532 nm. The SHG element 15 has a rectangular parallelepiped shape. As the SHG element 15, for example, a nonlinear optical crystal can be used. As the nonlinear optical crystal, for example, a polarization inversion crystal (Periodically Poled Lithium Niobate; PPLN) of lithium niobate (LiNbO ₃ ) can be used. The SHG element 15 has a polarization inversion structure with a pitch corresponding to the first wavelength of the fundamental light. By using the SHG element 15, it is possible to supply laser light having a desired wavelength and a sufficient amount of light using a general-purpose light source that can be easily obtained.

The external resonator 17 resonates light from the semiconductor element 11 with the semiconductor element 11. The external resonator 17 selectively reflects light having the first wavelength and transmits light having a wavelength different from the first wavelength (including the second wavelength). As the external resonator 17, for example, VHG (Volume Holographic Grating) can be used. VHG can be formed using a photorefractive crystal such as LiNbO ₃ or BGO, a polymer, or the like.

  The first structure 19 and the second structure 21 constitute a package that houses the semiconductor element 11, the optical prism 13, the SHG element 15, and the external resonator 17. The first structure 19 is configured using a plate-shaped metal member. The semiconductor element 11, the optical prism 13, the SHG element 15, and the external resonator 17 are disposed on the first structure 19. The prism base 12 supports the optical prism 13 with respect to the semiconductor element 11 on the front side and the back side. The prism base 12 is formed with a portion where the semiconductor element 11 is provided. The SHG element base 16 supports the SHG element 15.

  The second structure 21 covers the semiconductor element 11, the optical prism 13, the SHG element 15, and the external resonator 17 on the first structure 19. The second structure 21 is configured using a ceramic member. The first structure 19 and the second structure 21 are formed by bonding the joint portion 22 of the second structure 21 to the first structure 19, so that the semiconductor element 11, the optical prism 13, the SHG element 15, and the external resonator 17. The space provided with is sealed. The joint portion 22 is a portion that can be joined to the first structure 19, and is formed around a portion of the second structure 21 that houses the semiconductor element 11 and the like. The joint portion 22 is formed by bending the outer edge portion of the second structure 21 so as to be parallel to the upper surface of the first structure 19. By forming the joining portion 22 into a thin shape, the first structure 19 and the second structure 21 can be easily joined by laser heating of solder or the like.

  The window 18 is provided in the second structure 21 at a position where light from the semiconductor element 11 enters. The window 18 is provided so as to completely close the opening formed in the second structure 21. The window 18 functions as a wavelength selective transmission unit that reflects light of the first wavelength and transmits light of the second wavelength. The window 18 is configured by providing a dielectric multilayer film on the surface of the transparent member such as glass on the side of the external resonator 17. The sealed structure using the first structure 19 and the second structure 21 and the window 18 having wavelength selectivity reduce the emission of fundamental light to the outside of the light source device 10.

  The fundamental wave light from the semiconductor element 11 enters the optical prism 13. The light incident on the optical prism 13 is reflected at the interface of the optical prism 13 and is incident on the dichroic film 14 after the optical path is bent. The fundamental wave light incident on the dichroic film 14 passes through the dichroic film 14 and exits from the optical prism 13. The light from the optical prism 13 enters the SHG element 15.

  The harmonic light generated in the SHG element 15 when the fundamental light is incident from the optical prism 13 passes through the external resonator 17. The harmonic light transmitted through the external resonator 17 passes through the window 18 and then exits from the light source device 10. The fundamental light transmitted from the optical prism 13 through the SHG element 15 is reflected by the external resonator 17. The light reflected by the external resonator 17 enters the SHG element 15.

  Harmonic light generated in the SHG element 15 when the fundamental wave light is incident from the external resonator 17 is reflected by the dichroic film 14 in the optical prism 13 and the optical path is bent. The light reflected by the dichroic film 14 is further bent by the reflection at the interface of the optical prism 13 and is emitted from the optical prism 13. The light emitted from the optical prism 13 passes through the vicinity of the SHG element 15 and the vicinity of the external resonator 17. The light that has passed through the vicinity of the SHG element 15 and the vicinity of the external resonator 17 travels substantially parallel to the light that has passed through the external resonator 17 and passes through the window 18.

  The fundamental light that has passed through the SHG element 15 from the external resonator 17 side passes through the dichroic film 14 in the optical prism 13. The light transmitted through the dichroic film 14 is reflected at the interface of the optical prism 13 and travels toward the semiconductor element 11. Light incident on the semiconductor element 11 from the optical prism 13 is reflected by a mirror layer (not shown) provided on the semiconductor element 11. The light reflected by the mirror layer of the semiconductor element 11 and the external resonator 17 resonates with the fundamental wave light newly emitted from the semiconductor element 11 and is amplified. By using the optical prism 13, the harmonic light generated by making the fundamental light incident from the external resonator 17 to the SHG element 15 travels outside the light source device 10, and the fundamental light transmitted through the SHG element 15 is transmitted to the semiconductor element 11. It can be advanced in the direction of Thereby, wavelength conversion efficiency can be improved.

  FIG. 2 shows a state where the second structure 21 is removed from the first structure 19. FIG. 3 shows an AA cross-sectional configuration of the second structure 21 shown in FIG. In FIG. 2, the second structure 21 shows a configuration viewed obliquely from the first structure 19 side. A package wiring portion 25 is provided in the second structure 21 constituting the package. As shown in FIG. 3, the package wiring portion 25 is disposed along the inner surface of the second structure 21. The package wiring portion 25 is formed so as to form a striped pattern by bending one conductive wire at a plurality of locations. The pattern of the package wiring portion 25 is arranged so as to be substantially orthogonal to the traveling direction of light from the semiconductor element 11. The first end portion 26 and the second end portion 27, which are the end portions of the package wiring portion 25, are both arranged at the joint portion 22. The package wiring part 25 can be formed by, for example, forming a metal film on the second structure 21 using a metallization technique or the like and then patterning the metal film.

  The first structure 19 shown in FIG. 2 shows a configuration viewed obliquely from the second structure 21 side. A substrate 20 is provided on a portion of the first structure 19 other than the portion on which the semiconductor element 11, the prism base 12, the SHG element base 16, and the external resonator 17 are provided. The substrate 20 is configured using an insulating member. A light source power supply unit 33 is provided on a portion of the substrate 20 facing the semiconductor element 11. The light source power supply unit 33 is a conducting wire for supplying power to the semiconductor element 11. A light source driving unit (not shown) is connected to an end of the light source power supply unit 33 opposite to the semiconductor element 11 side.

  A first connection conductor 31 and a second connection conductor 32 are provided on both sides of the light source power supply unit 33 on the substrate 20. The first connection conductor 31 and the second connection conductor 32 are connection conductors that connect the package wiring portion 25 and a disconnection detection circuit (not shown). The board | substrate 20 interrupts | blocks unnecessary conduction | electrical_connection of the power supply part 33 for light sources, the 1st connection conducting wire 31, and the 2nd connection conducting wire 32. FIG. The end portion 34 of the first connection conducting wire 31 is placed at a position where it abuts on the first end portion 26 of the package wiring portion 25 by joining the first structure 19 and the second structure 21 together.

  The end portion 35 of the second connecting conductor 32 is installed at a position where it abuts on the second end portion 27 of the package wiring portion 25 by joining the first structure 19 and the second structure 21 together. Since the first end portion 26 and the second end portion 27 are arranged at the joint portion 22 of the second structure body 21, the first connection conductor is obtained by joining the first structure body 19 and the second structure body 21. 31, the second connecting conductor 32 and the package wiring portion 25 can be easily connected.

  FIG. 4 shows a configuration of the disconnection detection circuit 40. The disconnection detection circuit 40 is a disconnection detection unit that detects disconnection of the package wiring unit 25. The disconnection detection circuit 40 detects disconnection of the package wiring part 25 by a change in voltage. An energizing power source 42 is connected to the first connecting lead 31. A voltage detection resistor 43 is connected to the second connection conductor 32. The package wiring portion 25 and the voltage detection resistor 43 are energized by the energization power source 42. The comparator 45 compares the voltage of the voltage detection resistor 43 with the reference voltage from the comparison power supply 44 and outputs two different voltages depending on the magnitude relationship. The light source driving unit 41 drives the semiconductor element 11 according to the input from the comparator 45. While the package wiring portion 25 is energized, the magnitude relationship between the voltage of the voltage detection resistor 43 and the reference voltage is constant. During this time, the light source driving unit 41 continues to drive the semiconductor element 11 in accordance with the input from the comparator 45.

  For example, it is assumed that the package wiring part 25 is disconnected due to the damage of the second structure 21. The magnitude relationship between the voltage of the voltage detection resistor 43 and the reference voltage changes due to the disconnection of the package wiring portion 25. The light source drive unit 41 stops driving the semiconductor element 11 in accordance with the change in the magnitude relationship between the voltage of the voltage detection resistor 43 and the reference voltage. In this way, the disconnection detection circuit 40 stops the driving of the semiconductor element 11 when the disconnection of the package wiring portion 25 is detected. The semiconductor element 11 stops emitting light due to the disconnection of the package wiring part 25.

  As described above, by using the package wiring portion 25, the emission of light from the semiconductor element 11 can be stopped together with the package damage. Thereby, when a package is damaged, there exists an effect that the leakage of the light of a high energy density can be prevented and high safety | security can be ensured. The disconnection detection circuit 40 only needs to be able to detect disconnection of the package wiring portion 25 and is not limited to the configuration described in this embodiment.

  FIG. 5 illustrates a modification of the present embodiment. The second structure 47 of the present modification is configured using a metal member. An insulating layer 46 is provided between the second structure 47 and the package wiring part 25. The insulating layer 46 blocks conduction between the package wiring part 25 and the second structure 47. By using the second structure 47 made of a metal member, the package can be made inexpensive and strong. By using the insulating layer 46, unnecessary conduction between the package wiring portions 25 can be cut off. The package wiring portion 25 described in the present modification can be formed by patterning the metal layer after laminating the insulating layer 46 and the metal film on the second structure 47.

  The light source device 10 may be configured to use a semiconductor laser pumped solid state (DPSS) laser, a solid laser, a liquid laser, a gas laser, or the like, in addition to using a semiconductor element as a light source unit. The light source unit may be an array light source that emits a plurality of lights. The light source device 10 is not limited to the configuration described in the present embodiment, and the configuration may be changed as appropriate.

  FIG. 6 shows a schematic configuration of a light source device 50 according to Embodiment 2 of the present invention. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. The window 51 is disposed so as to be inclined with respect to the light beam from the external resonator 17. The window 51 functions as a wavelength selective transmission unit that reflects light of the first wavelength and transmits light of the second wavelength. The window 51 is configured by providing a dielectric multilayer film on the surface of the transparent member such as glass on the side of the external resonator 17. The harmonic light emitted from the external resonator 17 passes through the window 51 and then exits from the light source device 50. The fundamental wave light incident on the window 51 obliquely from the external resonator 17 is reflected by the window 51 and then enters the second structure 21. The fundamental light incident on the second structure 21 is absorbed by the second structure 21.

  FIG. 7 illustrates the configuration of the package wiring portion 52 provided in the second structure 21. The area AR is an area where the fundamental wave light having the first wavelength reflected by the window 51 is incident in the second structure 21 and an area in the vicinity thereof. The pattern of the package wiring part 52 is formed such that the interval in the area AR is smaller than the area other than the area AR in the second structure 21. The pattern of the package wiring portion 52 is formed so that the width in the area AR is smaller than the area other than the area AR. By reducing the width of the package wiring part 52, the package wiring parts 52 can be arranged densely. By reducing the interval between the package wiring portions 52 in the region AR, the detection resolution of package breakage can be increased at a location where the fundamental light is likely to be incident. Thereby, leakage of the fundamental wave light can be effectively prevented.

  FIGS. 8-10 demonstrates the light source device which concerns on Example 3 of this invention. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. As shown in FIG. 8, a heater 61 and a thermistor 62 are provided on the SHG element 15. The heater 61 is disposed at the center of the SHG element 15. The heater 61 is a temperature adjusting unit that adjusts the temperature of the SHG element 15 by supplying heat. The heater 61 is, for example, an electric heater. The thermistor 62 is a temperature measurement unit that measures the temperature of the SHG element 15. The thermistor 62 is disposed at a position other than the center of the SHG element 15. The thermistor 62 only needs to be able to measure the temperature of the SHG element 15 and is not limited to being disposed at the position described in the present embodiment.

  FIG. 9 shows a block configuration for adjusting the temperature of the SHG element 15. The thermistor 62 outputs a change in temperature to the temperature control unit 63 as a change in resistance value. The temperature control unit 63 calculates the amount of power supplied to the heater 61 from the temperature measured by the thermistor 62 and the deviation of a predetermined set temperature, and supplies the heater 61 with power corresponding to the calculated amount of power. The temperature control unit 63 performs feedback control of the heater 61 based on the measurement result by the thermistor 62. The heater 61 adjusts the temperature of the SHG element 15 based on the measurement result by the thermistor 62.

  FIG. 10 illustrates a configuration in which a heater 61 is connected between the first connection conductor 31 and the second connection conductor 32. The heater 61 is connected between the end portion 64 of the first connecting conductor 31 and the first end portion 26 of the package wiring portion 25. Electric power is supplied to the heater 61 using a circuit including the first connection conductor 31, the second connection conductor 32, and the package wiring portion 25. When the package wiring part 25 is disconnected, the heater 61 stops driving when the power supply is cut off. In the present embodiment, the semiconductor element 11 stops driving due to the disconnection of the package wiring portion 25 and the heater 61 also stops driving. Accordingly, the driving of the semiconductor element 11 can be stopped and the temperature adjustment by the heater 61 can be stopped due to the package damage. In addition, since it is not necessary to separately provide wiring for supplying power to the heater 61, the light source device can be simplified.

  The light source device may connect the signal line of the thermistor 62 to the package wiring part 25. The thermistor 62 can be connected to the package wiring portion 25 in the same manner as the heater 61. Thereby, the driving of the semiconductor element 11 can be stopped and the measurement by the thermistor 62 can also be stopped due to the breakage of the package. The position, quantity, and shape of the heater 61 are not limited to those described in this embodiment, and may be changed as appropriate. As the temperature adjusting unit, in addition to the heater 61, a Peltier element or a thin film resistor may be used. Moreover, you may utilize as a temperature control part what controls temperature by controlling energy, such as infrared irradiation.

  FIG. 11 shows a schematic configuration of the main part of a light source device according to Embodiment 4 of the present invention. The light source device of the present embodiment has a package wiring portion constituted by a first wiring layer 77 and a second wiring layer 72. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. The first wiring layer 77 is configured in the same manner as the package wiring part 25 (see FIG. 2) of the above embodiment.

  The second wiring layer 72 is disposed on the side where the semiconductor element 11 (see FIG. 1) is provided with respect to the first wiring layer 77. The pattern in the first wiring layer 77 and the pattern in the second wiring layer 72 are substantially orthogonal to each other. An insulating layer 71 is provided between the first wiring layer 77 and the second wiring layer 72. The insulating layer 71 blocks unnecessary conduction between the first wiring layer 77 and the second wiring layer 72. The insulating layer 71 is configured using an insulating member.

  Of the package wiring portion, the first end portion 26 of the first wiring layer 77 is connected to the end portion 34 (see FIG. 2) of the first connection conducting wire 31. A second end 73 of the first wiring layer 77 opposite to the first end 26 is disposed in alignment with the first end 74 of the second wiring layer 72. A through hole (not shown) is formed in the insulating layer 71 between the second end 73 of the first wiring layer 77 and the first end 74 of the second wiring layer 72. The second end 73 of the first wiring layer 77 and the first end 74 of the second wiring layer 72 are connected by a bump (not shown) provided in the through hole. The bump is configured using a conductive member, for example, a metal member.

  The second end portion 76 of the second wiring layer 72 in the package wiring portion is connected to the end portion 35 (see FIG. 2) of the second connection conducting wire 32. With such a configuration, the first wiring layer 77 and the second wiring layer 72 of the package wiring portion are connected between the first connecting conductor 31 and the second connecting conductor 32. The light source device according to the present embodiment stops the emission of light from the semiconductor element 11 when disconnection occurs in at least one of the first wiring layer 77 and the second wiring layer 72 of the package wiring portion due to the package damage. By making the pattern in the first wiring layer 77 and the pattern in the second wiring layer 72 substantially orthogonal to each other, it is possible to improve the detection resolution of the package breakage. Thereby, leakage of light can be effectively prevented.

  In each embodiment, the package wiring portion is not limited to being configured with one conductive wire, and may be configured with two or more conductive wires. For example, in the case where the package wiring portion is configured by two conductive wires in the third embodiment, a heater may be connected to one conductive wire, and a thermistor may be connected to the other conductive wire. The configurations of the embodiments may be combined as appropriate.

  FIG. 12 shows a schematic configuration of a monitor device 80 according to the fifth embodiment of the present invention. The monitor device 80 includes a device main body 81 and an optical transmission unit 82. The apparatus main body 81 includes the light source apparatus 10 (see FIG. 1) of the first embodiment. The light transmission unit 82 includes two light guides 84 and 85. A diffusion plate 86 and an imaging lens 87 are provided at the end of the light transmission unit 82 on the subject (not shown) side. The first light guide 84 transmits light from the light source device 10 to the subject. The diffusion plate 86 is provided on the emission side of the first light guide 84. The light propagating through the first light guide 84 is diffused on the subject side by passing through the diffusion plate 86. Each part in the optical path from the light source device 10 to the diffusion plate 86 constitutes an illumination device that illuminates the subject.

  The second light guide 85 transmits light from the subject to the camera 83. The imaging lens 87 is provided on the incident side of the second light guide 85. The imaging lens 87 condenses light from the subject onto the incident surface of the second light guide 85. The light from the subject enters the second light guide 85 through the imaging lens 87, then propagates through the second light guide 85 and enters the camera 83.

  As the 1st light guide 84 and the 2nd light guide 85, what bundled many optical fibers can be used. By using an optical fiber, it is possible to transmit laser light far away. The camera 83 is provided in the apparatus main body 81. The camera 83 is an imaging unit that captures an image of a subject illuminated by light from the light source device 10. By making the light incident from the second light guide 85 enter the camera 83, the camera 83 can image the subject. By using the light source device 10 of the first embodiment, it is possible to prevent leakage of light having a high energy density and to ensure high safety. Thereby, there exists an effect that high safety is securable. Note that any of the light source devices of the above-described embodiments may be applied to the monitor device 80.

  FIG. 13 shows a schematic configuration of a projector 90 according to Embodiment 6 of the present invention. The projector 90 is a front projection type projector that views light by supplying light to the screen 99 and observing light reflected by the screen 99. The projector 90 includes a red (R) light source device 91R, a green (G) light source device 91G, and a blue (B) light source device 91B. Each of the color light source devices 91R, 91G, and 91B has the same configuration as the light source device 10 (see FIG. 1) of the first embodiment. The description which overlaps with the said Example 1 is abbreviate | omitted. The projector 90 displays an image using light from each color light source device 91R, 91G, 91B.

  The R light source device 91 </ b> R is a light source device that supplies R light. The diffusing element 92 shapes and enlarges the illumination area, and makes the light amount distribution of the laser light uniform in the illumination area. As the diffusing element 92, for example, a computer generated hologram (CGH) which is a diffractive optical element can be used. The field lens 93 collimates the laser light from the R light source device 91R and makes it incident on the R light spatial light modulator 94R. The R light source device 91R, the diffusing element 92, and the field lens 93 constitute an illumination device that illuminates the R light spatial light modulator 94R. The spatial light modulator 94R for R light is a spatial light modulator that modulates R light from the illumination device according to an image signal, and is a transmissive liquid crystal display device. The R light modulated by the R light spatial light modulator 94R enters a cross dichroic prism 95 which is a color synthesis optical system.

  The G light source device 91G is a light source device that supplies G light. The laser light that has passed through the diffusing element 92 and the field lens 93 is incident on the G light spatial light modulator 94G. The light source device 91G for G light, the diffusing element 92, and the field lens 93 constitute an illumination device that illuminates the spatial light modulation device 94G for G light. The G light spatial light modulation device 94G is a spatial light modulation device that modulates the G light from the illumination device in accordance with an image signal, and is a transmissive liquid crystal display device. The G light modulated by the G light spatial light modulator 94G is incident on a surface of the cross dichroic prism 95 different from the surface on which the R light is incident.

  The light source device 91B for B light is a light source device that supplies B light. The laser light that has passed through the diffusing element 92 and the field lens 93 enters the B light spatial light modulator 94B. The light source device 91B for B light, the diffusing element 92, and the field lens 93 constitute an illumination device that illuminates the spatial light modulation device 94B for B light. The B light spatial light modulation device 94B is a spatial light modulation device that modulates B light from the illumination device in accordance with an image signal, and is a transmissive liquid crystal display device. The B light modulated by the B light spatial light modulator 94B is incident on a surface of the cross dichroic prism 95 different from the surface on which the R light is incident and the surface on which the G light is incident. As the transmissive liquid crystal display device, for example, a high temperature polysilicon TFT liquid crystal panel (HTPS) can be used.

  The cross dichroic prism 95 has two dichroic films 96 and 97 arranged substantially orthogonal to each other. The first dichroic film 96 reflects R light and transmits G light and B light. The second dichroic film 97 reflects B light and transmits R light and G light. The cross dichroic prism 95 combines R light, G light, and B light incident from different directions, and emits the light toward the projection lens 98. The projection lens 98 projects the light combined by the cross dichroic prism 95 toward the screen 99.

  By using each color light source device 91R, 91G, 91B having the same configuration as the light source device 10 described above, it is possible to prevent leakage of light having a high energy density and to ensure high safety. Thereby, there exists an effect that high safety is securable. Each color light source device 91R, 91G, 91B may have the same configuration as any of the light source devices described in the above embodiments. For example, the projector 90 emits the fundamental light from the light source unit without using the SHG element for the R light source device 91R, and the above light source for the G light source device 91G and the B light source device 91B. It is good also as a structure similar to the apparatus 10. FIG.

  The projector is not limited to the case where a transmissive liquid crystal display device is used as the spatial light modulation device. As the spatial light modulator, a reflective liquid crystal display (Liquid Crystal On Silicon; LCOS), DMD (Digital Micromirror Device), GLV (Grating Light Valve), or the like may be used. The projector is not limited to a configuration including a spatial light modulator for each color light. The projector may be configured to modulate two or three or more color lights with one spatial light modulator. The projector is not limited to the case where the spatial light modulator is used. The projector may be a laser scanning projector that scans the laser light from the light source device by scanning means such as a galvanometer mirror and displays an image on the irradiated surface. The projector may be a slide projector that uses a slide having image information. The projector may be a so-called rear projector that supplies light to one surface of the screen and observes an image by observing light emitted from the other surface of the screen.

  The light source device of the present invention may be applied to a liquid crystal display that is an image display device. By combining the light source device of the present invention and the light guide plate, it can be used as an illumination device for illuminating the liquid crystal panel. Also in this case, high safety can be ensured. The light source device of the present invention is not limited to being applied to a monitor device or an image display device. The light source device of the present invention may be used, for example, in an optical system such as an exposure device for laser beam exposure or a laser processing device.

  As described above, the light source device according to the present invention is suitable for use in a monitor device or an image display device.

The figure which shows schematic structure of the light source device which concerns on Example 1 of this invention. The figure which shows the state which removed the 2nd structure from the 1st structure. The figure which shows the AA cross-section structure of the 2nd structure shown in FIG. The figure which shows the structure of a disconnection detection circuit. FIG. 6 is a diagram for explaining a modification of the first embodiment. The figure which shows schematic structure of the light source device which concerns on Example 2 of this invention. The figure explaining the structure of the package wiring part provided in the 2nd structure. The figure explaining arrangement | positioning of a heater and a thermistor. The figure which shows the block structure for adjusting the temperature of a SHG element. The figure explaining the structure by which the heater was connected to the conducting wire for 1st connection. The figure which shows the principal part schematic structure of the light source device which concerns on Example 4 of this invention. The figure which shows schematic structure of the monitor apparatus which concerns on Example 5 of this invention. FIG. 10 is a diagram illustrating a schematic configuration of a projector according to a sixth embodiment of the invention.

Explanation of symbols

  Reference Signs List 10 light source device, 11 semiconductor element, 12 prism base, 13 optical prism, 14 dichroic film, 15 SHG element, 16 SHG element base, 17 external resonator, 18 window, 19 first structure, 20 substrate, 21 2nd structure, 22 junction part, 25 package wiring part, 26 1st end part, 27 2nd end part, 31 1st connection lead wire, 32 2nd connection lead wire, 33 light source power supply part, 34, 35 end, 40 disconnection detection circuit, 41 light source drive unit, 42 power supply for energization, 43 voltage detection resistor, 44 power supply for comparison, 45 comparator, 46 insulating layer, 47 second structure, 50 light source device, 51 window, 52 package wiring part, 61 heater, 62 thermistor, 63 temperature control part, 64 end part, 71 insulating layer, 72 second wiring layer, 73, 7 Second end portion, 74 First end portion, 77 First wiring layer, 80 Monitor device, 81 Device body, 82 Light transmission portion, 83 Camera, 84 First light guide, 85 Second light guide, 86 Diffuser plate, 87 Imaging lens, 90 projector, 91R R light source device, 91G G light source device, 91B B light source device, 92 diffusing element, 93 field lens, 94RR light spatial light modulator, 94G G light space Light modulator, spatial light modulator for 94B light, 95 cross dichroic prism, 96 first dichroic film, 97 second dichroic film, 98 projection lens, 99 screen

Claims (9)

A light source that emits light;
A package for storing at least the light source unit;
A package wiring portion provided in the package and formed to form a pattern;
A disconnection detection unit for detecting disconnection of the package wiring unit;
Have
The package is
A first structure in which the light source unit is disposed, and a connecting conductor for connecting the package wiring unit and the disconnection detection unit is disposed;
A second structure in which the package wiring portion is disposed and an end portion of the package wiring portion is disposed at a joint portion formed so as to be capable of being joined to the first structure;
Have
When disconnection of the package wiring part is detected, driving of the light source part is stopped and emission of light from the light source part is stopped. The light source unit emits light of a first wavelength,
A wavelength conversion element that converts the wavelength of the first wavelength of light emitted from the light source unit and emits light of a second wavelength that is different from the first wavelength;
A wavelength selective transmission part that is provided at a position where light from the wavelength conversion element is incident in the package, reflects the light of the first wavelength, and transmits the light of the second wavelength;
The pattern of the package wiring portion is such that the interval in the region where the light of the first wavelength reflected by the wavelength selective transmission portion of the package is incident is greater than the interval in the region other than the region where the light of the first wavelength is incident. The light source device according to claim 1, wherein the light source device is formed small. A wavelength conversion element that converts the wavelength of light emitted from the light source unit;
A temperature measurement unit for measuring the temperature of the wavelength conversion element;
A temperature adjusting unit that adjusts the temperature of the wavelength conversion element based on a measurement result by the temperature measuring unit;
The package wiring portion, the temperature measuring unit and the light source apparatus according to claim 1 or 2, characterized in that it is connected to at least one of the temperature adjusting unit. The package wiring portion includes a first wiring layer and a second wiring layer disposed on a side where the light source unit is provided with respect to the first wiring layer, and a pattern in the first wiring layer; the light source device according to any one of claims 1 to 3, characterized in that the pattern in the second wiring layer is substantially orthogonal to each other. The light source device according to any one of claims 1 to 4 , wherein the second structure is configured using a ceramic member. The second structure is configured using a metal member,
The light source device according to any one of claims 1 to 5, characterized in that an insulating layer provided between said second structure and the package wiring portion. It has a light source device according to any one of claims 1 to 6 lighting device characterized by illuminating the object to be irradiated with light from the light source device. A lighting device according to claim 7 ;
An image pickup unit for picking up an image of a subject illuminated by the illumination device. It has a light source device according to any one of claims 1 to 6, the image display device and displaying an image using light from the light source device.

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