JP2012155003A - Projector and method for controlling projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector capable of preventing a situation in which exciting light from a solid light source is directly output to the outside due to the deterioration of a fluorescent plate while grasping a deterioration state of the fluorescent plate and method for controlling the same.SOLUTION: A projector 1 comprises: a solid light source 11 for emitting exciting light; a rotating fluorescent plate 13 for emitting light by receiving the exciting light; a sensor 60 for detecting the temperature around the rotating fluorescent plate 13; a detection part 80 for determining whether or not the detection temperature by the sensor 60 falls within a range between a first temperature corresponding to the blackening of a fluorescent body of the rotating fluorescent plate 13 and a second temperature corresponding to the breaking of the fluorescent body; and a control part 90 for stopping the light emission of the solid light source 11 when the detection part 80 determines that the detection temperature does not fall within the range.

Description

  The present invention relates to a projector and a projector control method.

  In recent years, attention has been focused on laser light sources capable of individually emitting red light R, green light G, and blue light B as light sources for projectors. For example, like a projector disclosed in Patent Document 1, a method of using light emitted from a phosphor by causing excitation light to enter the phosphor has been proposed.

JP 2009-277516 A

  By the way, there are two types of phosphor degradation (damage), blackening and cracking. In general, blackening proceeds as the conversion efficiency of the phosphor decreases. Further, as the blackening proceeds, the excitation laser light is absorbed as heat, so that the surface temperature rises and the glass serving as the phosphor support is broken. In the projector disclosed in Patent Document 1, since the surface of the phosphor is irradiated with a high light density laser, the phosphor itself may be deteriorated, that is, may be blackened or cracked. If the phosphor itself is broken, excitation light (for example, blue light B) is transmitted through the broken portion, so that the excitation light from the solid light source may be directly output to the outside of the projector. There was a problem.

  The present invention has been made in view of the above points, and it is possible to prevent a situation in which excitation light from a solid light source is directly output to the outside due to deterioration of the phosphor while grasping the deterioration state of the phosphor. An object of the present invention is to provide a projector that can be used and a projector control method.

The present invention has been made to solve the above-described problem, and is a first light source that detects a temperature in the vicinity of the phosphor, a solid-state light source that emits excitation light, a phosphor that emits light upon receiving the excitation light. A sensor and a determination unit that determines whether or not the temperature detected by the first sensor is within a range from a first temperature corresponding to blackening of the phosphor to a second temperature corresponding to cracking of the phosphor; And a control unit that stops light emission of the solid-state light source when the determination unit determines that the detected temperature is not within the range.
With this configuration, the temperature near the phosphor is detected by the first sensor, and the range from the first temperature corresponding to blackening of the phosphor to the second temperature corresponding to cracking of the phosphor is determined by the determination unit. In addition, it is determined whether or not the temperature detected by the first sensor is within the range, and when the determination unit determines that the detected temperature is not within the range by the control unit, the emission of the solid state light source is stopped. Since it did in this way, the projector can prevent the situation where the excitation light from the solid light source is directly output to the outside due to the deterioration of the phosphor while grasping the deterioration state of the phosphor.

In addition, the present invention further includes a second sensor that detects a temperature inside the housing of the projector, and a calculation unit that subtracts the temperature detected by the second sensor from the temperature detected by the first sensor, and the determination unit Determining whether the subtraction result is within a range from the first temperature that changes according to the temperature in the housing to the second temperature that changes according to the temperature inside the housing. It is a projector characterized by this.
With this configuration, the temperature in the housing of the projector is detected by the second sensor, the temperature detected by the second sensor is subtracted from the temperature detected by the first sensor by the calculating unit, and the temperature inside the housing is determined by the determining unit. Since it is determined whether or not the subtraction result is within a range from the first temperature that changes according to the temperature to the second temperature that changes according to the temperature inside the housing. While grasping the deterioration state of the phosphor, it is possible to prevent a situation in which excitation light from the solid light source is directly output to the outside due to the deterioration of the phosphor.

In the projector according to the aspect of the invention, the second sensor may detect a temperature corresponding to outside air sucked into the housing.
With this configuration, since the temperature detected by the second sensor is set to a temperature corresponding to the outside air, the projector grasps the deterioration state of the phosphor according to the temperature of the outside air, and the excitation light from the solid light source due to the deterioration of the phosphor. Can be prevented from being directly output to the outside.

The present invention is also a control method for a projector, wherein the solid light source emits excitation light, the sensor detects the temperature in the vicinity of the phosphor, and the determination unit includes the black of the phosphor. Determining whether or not the temperature detected by the sensor falls within a range from a first temperature corresponding to crystallization to a second temperature corresponding to cracking of the phosphor; And a step of stopping light emission of the solid state light source when the determination unit determines that it is not within the range.
With this configuration, the sensor detects the temperature in the vicinity of the phosphor, and the determination unit has a range from a first temperature corresponding to blackening of the phosphor to a second temperature corresponding to cracking of the phosphor, Since it is determined whether or not the temperature detected by the sensor is within the range, and the controller determines that the detected temperature is not within the range, the emission of the solid state light source is stopped. The projector can prevent the excitation light from the solid light source from being directly output to the outside due to the deterioration of the phosphor while grasping the deterioration state of the phosphor.

It is a block diagram which shows the structure of the projector in one Embodiment of this invention. It is a block diagram which shows the structure of the optical system of the projector in one Embodiment of this invention. It is a block diagram which shows the structure of the laser light source in one Embodiment of this invention. It is a figure which shows the light emission wavelength characteristic of fluorescent substance in one Embodiment of this invention. It is a block diagram which shows the structure of the control system for performing deterioration determination of a rotation fluorescent plate in one Embodiment of this invention. It is a figure which shows the relationship between the temperature (outside temperature) in a housing | casing, and a detected temperature difference in one Embodiment of this invention. It is a figure which shows minimum temperature difference Temp_min and maximum temperature difference Temp_max when the temperature in a housing | casing is 40 degreeC in one Embodiment of this invention. It is a flowchart which shows the procedure which determines deterioration based on the temperature detected by two sensors in one Embodiment of this invention. It is a flowchart which shows the procedure which determines deterioration based on the temperature detected by one sensor in one Embodiment of this invention.

[First Embodiment]
A first embodiment of the present invention will be described in detail with reference to the drawings. The projector according to the first embodiment grasps the deterioration state of the phosphor based on the difference between the temperature in the vicinity of the phosphor and the temperature in the housing, and the excitation light from the solid light source is exposed to the outside due to the deterioration of the phosphor. Prevents direct output.

  FIG. 1 is a block diagram showing the configuration of the projector. The projector 1 includes a main board 2, liquid crystal panels (light modulation elements) 30R, 30G, and 30B, a light source device 10, a detection unit 80, a control unit 90, and a driver 100. The main board 2 drives the liquid crystal panels 30R, 30G, and 30B by outputting image signals to the liquid crystal panels 30R, 30G, and 30B based on the input image data and timing signals. The liquid crystal panels 30R, 30G, and 30B modulate and emit the light when transmitting the laser light from the light source device 10.

  The light source device 10 includes a solid light source unit 11 that emits laser light that is excitation light, and a rotating fluorescent plate 13. The solid-state light source unit 11 is driven by a driver 100 to emit blue light that is excitation light (emission intensity peak: about 445 [nm]). The solid-state light source unit 11 is a plurality of semiconductor laser elements arranged in a matrix. The solid-state light source unit 11 can obtain high-output blue light by including a plurality of semiconductor laser elements. Hereinafter, the solid light source unit 11 will be described as an example that emits blue light having an emission intensity peak of 445 [nm], but the emission intensity peak different from this (for example, about 460 [nm]). ) Can also be used.

  The rotating fluorescent plate 13 converts part of the blue light, which is excitation light, into fluorescence containing red light and green light. The rotating fluorescent plate 13 is rotatably supported by a motor 14 controlled by the main board 2. The light source device 10 is provided with sensors (thermistors) 60 and 70. The sensor (first sensor) 60 is provided in the vicinity of the rotating fluorescent plate 13 and detects the temperature th1 in the vicinity of the rotating fluorescent plate 13. The sensor 60 is disposed, for example, in the vicinity of a region where the laser light is collected on the rotating fluorescent plate 13.

  The sensor 70 (second sensor) detects the temperature inside the housing of the projector 1, for example, the temperature th2 according to the outside air sucked into the housing. The sensor 70 is disposed, for example, near the air inlet (not shown) of the housing. The detection unit 80 detects the temperature th1 detected by the sensor 60 and the temperature th2 detected by the sensor 70, and outputs information representing the detected temperature to the control unit 90 for each sensor.

  The control unit (microcontroller, μC) 90 calculates a temperature difference (hereinafter referred to as “detection temperature difference”) between the temperature (phosphor vicinity temperature) th1 and the temperature (temperature in the housing) th2 and calculates the calculated detection temperature. Based on the difference, the driver 100 is driven and controlled.

  More specifically, when the detected temperature difference is within a predetermined temperature range, the control unit 90 determines that the rotating fluorescent plate 13 is not blackened or cracked (has not deteriorated), and passes the driver 100. Then, the driving of the solid light source unit 11 is continued. On the other hand, when the detected temperature difference is not within the predetermined temperature range, the control unit 90 determines that the rotating fluorescent plate 13 has been blackened or cracked (deteriorated), and the excitation light (laser light) emission is turned off. As described above, the solid-state light source unit 11 is controlled via the driver 100.

  FIG. 2 is a block diagram showing the configuration of the optical system of the projector. The excitation light emitted from the solid light source unit 11 is condensed on the rotating fluorescent plate 13 by the condenser lens 12. Further, the phosphor of the rotating fluorescent plate 13 emits light by the excitation light. The light emitted from the rotating fluorescent plate 13 is condensed again on the rod integrator 16 by the collimating optical system 15. In the rod integrator 16, light is mixed and made uniform by multiple reflection. The light output from the rod integrator 16 is separated into blue light B, green light G, and red light R by the dichroic mirrors 21 and 22 through the superimposing lens 19. The separated blue light B, green light G, and red light R are reflected by the mirrors 23, 24, and 25, respectively. The reflected blue light B, green light G, and red light R are collected by the relay lens 27 and illuminate the corresponding transmissive liquid crystal panels 30B, 30G, 30R, respectively.

  The transmissive liquid crystal panels 30B, 30G, and 30R spatially modulate the illumination light according to the input image signal. In addition, the transmissive liquid crystal panels 30B, 30G, and 30R output images based on spatially modulated illumination light. The image lights output from the transmissive liquid crystal panels 30B, 30G, and 30R for the respective colors are combined by the cross prism 40 and projected onto a screen (not shown) by the projection optical system 50.

  FIG. 3 is a block diagram showing the configuration of the light source device. The solid-state light source unit 11 includes an excitation LD (Laser Diode) 11a and a collimator lens 11b. For example, the excitation LDs 11a are arranged in a matrix of 5 × 5. The excitation LD 11a outputs blue light (excitation light) in the vicinity of a wavelength of 450 [nm]. The excitation light is collimated by the collimator lens 11 b and is condensed on the rotating fluorescent plate 13 by the condenser lens 12.

  The phosphor 13b of the rotating fluorescent plate 13 is applied in a state of being mixed in a transparent resin on a disc (glass) 13a on which a dichroic film 13c as a wavelength separation mirror is formed. The transparent resin is, for example, silicone, and is kneaded with the powder of the phosphor 13b, applied, then thermally cured, and fixed on the dichroic film 13c.

  FIG. 4 shows the emission wavelength characteristics of the phosphor. In FIG. 4, the horizontal axis represents wavelength [nm], and the vertical axis represents relative intensity. The phosphor 13b (see FIG. 3) is, for example, a YAG (yttrium, aluminum, garnet) phosphor, and has a wavelength of about 490 to 750 [nm] around 570 [nm] as shown in FIG. Emitting light. The phosphor light includes green light (G: near wavelength 530 [nm]) and red light (R: near wavelength 630 [nm]).

  Part of the blue light B incident on the phosphor 13b leaks to the opposite side of the rotating phosphor plate 13 without exciting the phosphor 13b. As the leaked blue light and phosphor light are mixed, phosphor 13b emits white light. That is, when blue light is incident on the phosphor 13b, three color lights necessary for color display are obtained by the red light and green light converted by the phosphor 13b and the blue light transmitted through the phosphor 13b.

  Returning to FIG. 2, the description of the configuration of the light source device will be continued. The rotating fluorescent plate 13 is rotationally driven by the motor 14 at 7500 [rpm]. For example, when the diameter of the rotating fluorescent plate 13 is 50 [mm], the incident position (condensing spot) of the excitation light on the rotating fluorescent plate 13 is at a position away from the rotation center of the rotating fluorescent plate 13 by about 22.5 [mm]. Is set. In this case, the rotating fluorescent plate 13 is rotationally driven by the motor 14 so that the incident position of the excitation light moves on the phosphor 13b at a rotational speed of about 18 [m / s].

  As shown in FIG. 2, since the excitation light is locally incident on the rotating fluorescent plate 13 by the condenser lens 12, the surface temperature of the rotating fluorescent plate 13 is locally high at the incident position. This local temperature rise causes deterioration of the rotating fluorescent screen 13. Therefore, the rotating fluorescent plate 13 is rotationally driven by the motor 14 so that the surface temperature thereof is substantially uniform. In such a configuration, it is necessary to prevent the excitation light from being directly output to the outside of the projector 1 even when the phosphor is deteriorated (blackened or cracked).

  FIG. 5 is a block diagram showing the configuration of the control system for determining the deterioration of the rotating fluorescent screen. In FIG. 5, parts corresponding to those in FIG. 1 or FIG. The control unit 90 includes a calculation unit 91 and a determination unit 92. The calculation unit 91 acquires information representing the temperature from the detection unit 80, and calculates a detected temperature difference.

  When the detected temperature difference is within a predetermined temperature range (described later), the determination unit 92 determines that the rotating fluorescent plate 13 is not blackened or cracked (is not deteriorated), and passes through the driver 100 to obtain a solid-state light source. Continue driving the unit 11. On the other hand, when the detected temperature difference is not within the predetermined temperature range, the determination unit 92 determines that the rotating fluorescent plate 13 has been blackened or cracked (deteriorated), and the excitation light (laser light) emission is turned off. As described above, the solid-state light source unit 11 is controlled via the driver 100.

  FIG. 6 shows the relationship between the temperature inside the housing (outside air temperature) and the detected temperature difference. Hereinafter, the temperature difference (first temperature) corresponding to the detected temperature difference when blackening occurs in the rotating fluorescent plate is referred to as “maximum temperature difference Temp_max”. Further, the temperature difference (second temperature) corresponding to the detected temperature difference when the rotating fluorescent plate is cracked is referred to as “minimum temperature difference Temp_min”.

  It is assumed that the relationship between the temperature in the housing and the detected temperature difference is measured in advance. For example, when the temperature in the housing (outside temperature) is 40 degrees Celsius, the phosphor vicinity temperature th1 when blackening occurs is 85 degrees Celsius. In this case, the maximum temperature difference Temp_max is 45 degrees Celsius (= 85 degrees Celsius−40 degrees Celsius). On the other hand, when the temperature in the housing (outside air temperature) is 40 degrees Celsius, the phosphor vicinity temperature th1 when the crack occurs is assumed to be 50 degrees Celsius. In this case, the minimum temperature difference Temp_min is 10 degrees Celsius (= 50 degrees Celsius−40 degrees Celsius). The maximum temperature difference Temp_min and the minimum temperature difference Temp_max measured in advance in this way are stored in advance in a memory (not shown) as a lookup table (LUT) for each temperature in the housing.

  FIG. 7 shows the minimum temperature difference Temp_min and the maximum temperature difference Temp_max when the temperature in the housing is 40 degrees Celsius. When the detected temperature difference (= phosphor vicinity temperature th1−internal housing temperature th2) is within the range from the minimum temperature difference Temp_min to the maximum temperature difference Temp_max, the determination unit 92 (see FIG. 5) It is determined that no deterioration has occurred. On the other hand, when the detected temperature difference is not within the range from the minimum temperature difference Temp_min to the maximum temperature difference Temp_max, the determination unit 92 determines that the rotating fluorescent plate 13 has been blackened or cracked (deteriorated).

  As shown in FIG. 6, when the temperature in the housing is 40 degrees Celsius, the maximum temperature difference Temp_max is 45 degrees Celsius. The minimum temperature difference Temp_min is 10 degrees Celsius. Therefore, when the detected temperature difference is in the range from 10 degrees Celsius to 45 degrees Celsius, the determination unit 92 determines that the rotating fluorescent plate 13 has not deteriorated. On the other hand, when the detected temperature difference is not within the range of 10 degrees Celsius to 45 degrees Celsius, the determination unit 92 determines that the rotating fluorescent screen 13 has been blackened or cracked (deteriorated). In a normal case where no deterioration has occurred, the detected temperature difference (detect_temp) is, for example, 40 degrees Celsius.

Next, a procedure for determining deterioration based on the temperatures detected by the two sensors will be described.
FIG. 8 is a flowchart showing a procedure for determining deterioration based on temperatures detected by two sensors. This procedure is started when the projector 1 is powered on (PJ activation). When the projector 1 is turned on, the solid light source unit 11 (see FIG. 1) is driven by the driver 100. Similarly, the rotating fluorescent screen 13 is rotationally driven by a motor 14.

  In addition, when the solid light source unit 11 is driven by the control unit 90 via the driver 100, blue light (excitation light) is emitted from the solid light source unit 11. The emitted blue light (excitation light) is condensed by the condensing optical system 12 and is incident on the rotating fluorescent plate 13 that is rotationally driven by the motor 14. Part of the blue light incident on the rotating fluorescent plate 13 is converted into yellow light (fluorescence) including red light and green light by the phosphor 13b (see FIG. 3) formed on the rotating fluorescent plate 13 (FIG. 4). See). The blue light incident on the rotating fluorescent plate 13 passes through the phosphor 13b with the remaining blue light remaining unchanged. The phosphor 13b emits white light by mixing the transmitted blue light and the phosphor light.

  The blue light transmitted through the phosphor 13 b and the yellow light (red light and green light) converted by the phosphor 13 b are approximately parallelized by the collimator optical system 15 and are made uniform by the rod integrator 16. Further, the uniformized light is separated into blue light B, green light G and red light R by the dichroic mirrors 21 and 22. The separated red light R, green light G, and blue light B illuminate the transmissive liquid crystal panels 30R, 30G, and 30B (see FIG. 2).

  Red light, green light, and blue light incident on the transmissive liquid crystal panels 30R, 30G, and 30B are spatially modulated according to an image signal input from the outside. Thereby, red image light, green image light, and blue image light are respectively generated. The generated image light is combined with a color image by the cross prism 40 and then enlarged and projected onto a screen (not shown) by the projection optical system 50. The image corresponding to the image signal input from the outside is projected on the screen in this way.

  The detection unit 80 (see FIG. 5) detects the temperature th1 detected by the sensor 60 and the temperature th2 detected by the sensor 70, and sends information representing the detected temperature to the control unit 90 for each sensor. Output. (Step S1).

  The calculation unit 91 acquires information representing the temperature from the detection unit 80, and calculates a detected temperature difference. The determination unit 92 determines whether the detected temperature difference (detect_temp) is equal to or greater than the minimum temperature difference Temp_min and whether the detected temperature difference is equal to or less than the minimum temperature difference Temp_max (step S2).

  When the detected temperature difference is equal to or greater than the minimum temperature difference Temp_min and the detected temperature difference is equal to or less than the minimum temperature difference Temp_max (step S2-YES), the determination unit 92 has blackened or cracked in the rotating fluorescent plate 13. The solid light source unit 11 is continuously driven via the driver 100. The process of each part of the projector 1 returns to step S1.

  On the other hand, when the detected temperature difference is less than the minimum temperature difference Temp_min or the detected temperature difference exceeds the minimum temperature difference Temp_max (step S2-NO), the determination unit 92 causes the rotating fluorescent screen 13 to be blackened or cracked. The solid light source unit 11 is controlled via the driver 100 so that it is determined that it has been generated (deteriorated) and the emission of excitation light (laser light) is turned off (step S3). Further, the power supply to each part of the projector 1 is stopped (PJ stop) (step S4).

  According to the first embodiment described above, the projector 1 includes the solid-state light source unit 11 that emits excitation light, the phosphor 13 that emits light by receiving excitation light, the sensor 60 that detects the temperature in the vicinity of the phosphor 13, A sensor 70 that detects the temperature inside the housing of the projector 1, a calculation unit 91 that subtracts the temperature detected by the sensor 70 from the temperature detected by the sensor 60, and calculates a detected temperature difference as a subtraction result, and a temperature according to the temperature inside the housing A determination unit 92 that determines whether or not the detected temperature difference is within a range from the maximum temperature difference Temp_max that changes depending on the temperature in the housing to the minimum temperature difference Temp_min that changes according to the temperature in the housing, and the detected temperature difference is within the range And a control unit 90 that stops the light emission of the solid light source unit 11 when the determination unit 92 determines that the light does not fall within the range.

  The sensor 70 detects the temperature inside the housing of the projector, and the calculating unit 91 subtracts the detected temperature by the sensor 70 from the detected temperature by the sensor 60 to calculate a detected temperature difference as a subtraction result. Thus, it is determined whether or not the detected temperature difference is within the range from the maximum temperature difference Temp_max that changes according to the temperature inside the casing to the minimum temperature difference Temp_min that changes according to the temperature inside the casing. Therefore, the projector can prevent a situation in which the excitation light from the solid light source is directly output to the outside due to the deterioration of the phosphor while grasping the deterioration state of the phosphor. In addition, since the projector grasps the deterioration state of the phosphor based on the temperature in the vicinity of the phosphor instead of the light amount of the excitation light, the projector is not affected by the deterioration of the phosphor without reducing the amount of light projected on the screen. It is possible to prevent the excitation light from the solid light source from being directly output to the outside.

[Second Embodiment]
A second embodiment of the present invention will be described in detail with reference to the drawings. The second embodiment is different from the first embodiment in that the projector 1 has one sensor. In the second embodiment, only differences from the first embodiment will be described.

  The projector 1 according to the second embodiment prevents a situation in which excitation light from the solid light source is directly output to the outside due to the deterioration of the phosphor while grasping the deterioration state of the phosphor based on the temperature in the vicinity of the phosphor. To do. In the projector 1 according to the second embodiment, the sensor 70 (see FIG. 1) is not provided, and only the sensor 60 is provided in the light source device 10.

  The sensor 60 detects the temperature th2 in the housing of the projector 1 before the solid light source unit 11 is activated. The sensor 60 detects the temperature th1 in the vicinity of the rotating fluorescent plate 13 after the solid light source unit 11 is activated. The detection unit 80 outputs information indicating the temperature th1 in the vicinity of the rotating fluorescent plate 13 detected by the sensor 60 and information indicating the temperature th2 in the housing of the projector 1 to the control unit 90.

Next, a procedure for determining deterioration based on the temperature detected by one sensor will be described.
FIG. 9 is a flowchart showing a procedure for determining deterioration based on the temperature detected by one sensor. This procedure is started when the projector 1 is powered on (PJ activation). The sensor 60 detects the temperature th2 in the housing of the projector 1. The detection unit 80 outputs information indicating the temperature th2 detected by the sensor 60 to the control unit 90 (step Sa1).

The rotating fluorescent screen 13 is driven to rotate by a motor 14. Moreover, the solid light source part 11 inject | emits excitation light by starting the light source device 10 (step Sa2).
Further, the sensor 60 detects the temperature th1 in the vicinity of the rotating fluorescent plate 13. The detection unit 80 outputs information indicating the temperature th1 detected by the sensor 60 to the control unit 90 (step Sa3).

  The calculation unit 91 acquires information representing the temperature from the detection unit 80, and calculates a detected temperature difference. The determination unit 92 determines whether or not the detected temperature difference (detect_temp) is equal to or greater than the minimum temperature difference Temp_min and whether the detected temperature difference is equal to or less than the minimum temperature difference Temp_max (step Sa4).

  When the detected temperature difference is equal to or greater than the minimum temperature difference Temp_min and the detected temperature difference is equal to or less than the minimum temperature difference Temp_max (step Sa4-YES), the determination unit 92 has blackened or cracked in the rotating fluorescent plate 13 The solid light source unit 11 is continuously driven via the driver 100. The processing of each part of the projector 1 returns to step Sa3.

  On the other hand, when the detected temperature difference is less than the minimum temperature difference Temp_min or the detected temperature difference exceeds the minimum temperature difference Temp_max (step Sa4-NO), the determination unit 92 causes the rotating fluorescent plate 13 to be blackened or cracked. It is determined that the light source has been generated (deteriorated), and the solid-state light source unit 11 is controlled via the driver 100 so that the emission of the excitation light (laser light) is turned off (LD extinguishing) (step Sa5). Furthermore, the power supply to each part of the projector 1 is stopped (PJ stop).

  According to the second embodiment described above, the projector 1 includes a solid-state light source unit 11 that emits excitation light, a phosphor 13 that emits light by receiving excitation light, a sensor 60 that detects a temperature near the phosphor 13, and A determination unit 92 that determines whether or not the detected temperature difference is within a range from a maximum temperature difference Temp_max that changes according to the temperature in the housing to a minimum temperature difference Temp_min that changes according to the temperature inside the housing; And a control unit 90 that stops the light emission of the solid light source unit 11 when the determination unit 92 determines that the detected temperature difference is not within the range.

  As a result, the projector has a simpler configuration than that of the second embodiment, and grasps the deterioration state of the phosphor, while the excitation light from the solid light source is directly output to the outside due to the deterioration of the phosphor. Can be prevented. In addition, since the projector grasps the deterioration state of the phosphor based on the temperature instead of the excitation light, the excitation light from the solid light source is externally transmitted by the deterioration of the phosphor without reducing the amount of light projected on the screen. It is possible to prevent a situation where the data is directly output to the output.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

  For example, the solid light source unit 11 may be a single semiconductor laser element.

  The projector and the program for realizing the projector control method described above may be recorded on a computer-readable recording medium, and the program may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible disk, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, “computer-readable recording medium” means a volatile memory (RAM) inside a computer system that becomes a server or client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included. The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Main board, 10 ... Light source device, 11 ... Solid light source part, 11a ... LD array, 11b ... Collimator lens, 12 ... Condensing lens, 13 ... Rotating fluorescent plate, 13a ... Disc, 13b ... Fluorescence Body, 13c ... dichroic film, 14 ... motor, 15 ... collimating optical system, 16 ... rod integrator, 19 ... superposition lens, 21 ... cross dichroic mirror, 22 ... cross dichroic mirror, 23, 24, 25 ... mirror, 27 ... relay Lens, 30R, 30G, 30B ... Liquid crystal panel, 40 ... Cross prism, 50 ... Projection optical system, 60, 70 ... Sensor, 80 ... Detection part, 90 ... Control part, 100 ... Driver

Claims (4)

A solid state light source that emits excitation light;
A phosphor that emits light in response to the excitation light;
A first sensor for detecting a temperature in the vicinity of the phosphor;
A determination unit for determining whether or not the temperature detected by the first sensor is within a range from a first temperature corresponding to blackening of the phosphor to a second temperature corresponding to cracking of the phosphor;
When the determination unit determines that the detected temperature is not within the range, a control unit that stops light emission of the solid light source;
A projector comprising: A second sensor for detecting a temperature in the housing of the projector;
A calculation unit that subtracts the temperature detected by the second sensor from the temperature detected by the first sensor;
Further comprising
The determination unit determines whether the subtraction result is within a range from the first temperature that changes according to the temperature in the housing to the second temperature that changes according to the temperature inside the housing. The projector according to claim 1, wherein the projector is determined.   The projector according to claim 2, wherein the second sensor detects a temperature according to outside air sucked into the housing. A control method in a projector,
A solid state light source emitting excitation light;
A sensor detecting a temperature in the vicinity of the phosphor;
A step of determining whether or not the temperature detected by the sensor falls within a range from a first temperature corresponding to blackening of the phosphor to a second temperature corresponding to cracking of the phosphor;
If the controller determines that the detected temperature is not within the range, the controller stops light emission of the solid light source;
Including a projector control method.

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