JP4127013B2 - projector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projector.
[0002]
[Background]
2. Description of the Related Art Conventionally, a discharge light-emitting type light source lamp has been used as a light source for a projector or the like.
The light source lamp includes an arc tube and a pair of electrodes installed in the arc tube. For example, mercury and a rare gas such as argon are enclosed in the arc tube.
When such a lamp is discharged by applying a voltage to a pair of electrodes, mercury evaporates and is excited by the discharge to emit light. Since the temperature of the arc tube is low when the arc tube is extinguished, the mercury in the arc tube is solid. When the arc tube is warmed by the discharge during lighting, mercury is gradually heated and evaporated. Therefore, there is a problem that it takes time until the luminous flux in the steady state is emitted after the lamp is turned on.
In order to solve this problem, a metal reservoir for storing solid mercury in the arc tube is formed, and a rod-like heating electrode such as tungsten is inserted into the metal reservoir to heat mercury in advance. (For example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 5-54863 (pages 3 to 4, FIG. 1)
[0004]
[Problems to be solved by the invention]
However, when mercury is heated by a rod-like heating electrode such as tungsten as described above, there is a problem that power consumption increases and it is difficult to save energy.
[0005]
An object of the present invention, the light source can reduce the time to fully lit is to provide a pulp projector can be saved energy.
[0006]
[Means for Solving the Problems]
The projector of the present invention forms an optical image by modulating a preheating device for preheating a discharge-type light source, a light source device having the light source, and a light beam emitted from the light source device according to input image information. A projector comprising a light modulation device , wherein the preheating device is a laser light output unit that emits laser light to the light source, and drive control that performs drive control of the laser light output unit based on an input power signal And a shielding unit that is provided on the optical path of the laser beam emitted from the laser beam output unit and blocks the laser beam based on a control signal from the drive control unit .
Here, a solid-state laser, a liquid laser, a gas laser, a semiconductor laser, or the like can be employed as the laser light source of the laser light output unit.
Examples of the discharge light source include a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, and a metal halide lamp.
[0007]
According to this invention, the light source can be preheated by emitting and irradiating laser light from the laser light output section of the preheating device. As a result, the metal excited by the discharge, such as mercury, can be evaporated, so that the time until the light source is completely turned on can be shortened. Further, since the laser light can be condensed and the energy density can be increased, the light source can be heated in a short time, and the time required for lighting can be shortened more effectively.
Further, when a laser is used, the light source can be sufficiently preheated with a laser beam of about 1 to 2 W, so that energy saving can be achieved.
Further, by providing a shielding part on the optical path of the laser light, it is possible to prevent the laser light from being unexpectedly emitted, and to improve the safety of the preheating device.
[0008]
In the present invention, the laser beam output unit preferably includes a red semiconductor laser or an infrared semiconductor laser.
According to this invention, since the semiconductor laser is smaller than other laser light sources, the preheating device can be downsized. In addition, since the size can be reduced in this way, the preheating device can be mounted on a projector that is desired to be reduced in weight and size, such as a projector.
Furthermore, since the red semiconductor laser and the near infrared semiconductor laser are inexpensive, the cost of the preheating device can be reduced.
[0011]
In the present invention, the laser beam output unit of the preheating device includes an infrared semiconductor laser, the light source device includes a reflector that reflects light emitted from the light source, and the reflective film of the reflector emits visible light. A dielectric multilayer film that reflects and transmits infrared rays is preferable.
When the reflecting film of the reflector is a film that does not transmit infrared rays, such as aluminum, a preheating device must be installed on the opening side of the reflector in order to allow infrared laser light to reach the lamp.
According to the present invention, since the reflective film of the reflector is a dielectric multilayer film that reflects visible light and transmits infrared light, for example, a preheating device is installed not only on the opening side of the reflector but also on the back side of the reflector. It is also possible, and the installation position of the preheating device is not limited.
[0012]
In the present invention, the laser light output unit of the preheating device includes an infrared semiconductor laser, and the light source of the light source device includes a light emitting unit main body and a light emitting tube surrounding the light emitting unit main body. An infrared absorption coat is preferably applied.
According to the present invention, the arc tube is provided with the infrared ray absorbing coating. Therefore, if the infrared ray absorbing light is irradiated to the infrared ray absorbing coat, the infrared ray is absorbed and the arc tube can be warmed more efficiently. Therefore, the preheating time can be shortened and energy can be saved.
[0013]
In the present invention, power detection means for detecting the supply of power to the power supply of the projector, and lighting on / off detection means for detecting lighting on / off of the light source, the drive control unit of the preheating device is the power detection means It is preferable that when the supply of power to the power source is detected, the laser light output unit is driven, and when the lighting on / off detecting unit detects that the light source is turned on, the driving of the laser light output unit is stopped.
According to the present invention, when the drive control unit of the preheating device detects the supply of power to the power source by the power detection means, the laser light output unit is driven, so that the preheating device can be sufficiently preheated before the light source is turned on. It is. Further, when the light on / off detection means detects that the light source is turned on, the driving of the laser light output unit is stopped. Therefore, when the light source is turned on, the laser light is not emitted and energy saving can be achieved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
[Configuration of optical system]
FIG. 1 is a schematic diagram showing the structure of an optical system of a projector 1 according to an embodiment of the present invention. The projector 1 includes a preheating device 10A, an integrator illumination optical system 41, a color separation optical system 42, a relay optical system 43, an optical device 44, a cross dichroic prism 444 that is a color synthesis optical system, and a projection lens 46 that is a projection optical system. It has.
The preheating device 10A is for preheating a lamp 416 that is a light source of a light source device 411 described later. Details of the preheating device 10A will be described later.
The integrator illumination optical system 41 illuminates almost uniformly the image forming areas of the three liquid crystal panels 441 constituting the optical device 44 (respectively, the liquid crystal panels 441R, 441G, and 441B for red, green, and blue color lights). And includes a light source device 411, a first lens array 412, a second lens array 413, a polarization conversion element 414, and a superimposing lens 415.
[0015]
The light source device 411 includes a lamp 416 as a radiation light source, a reflector 417, and an IR filter 417A arranged on the opening side of the reflector 417, and reflects the radial light beam emitted from the lamp 416 by the reflector 417. A parallel light beam is used, and the parallel light beam is emitted to the outside.
The lamp 416 includes a pair of electrodes (not shown) that are spaced apart from each other by a predetermined distance, and an arc tube 416A that covers the electrode and the separated portion of the pair of electrodes.
In the present embodiment, the lamp 416 is an ultra-high pressure mercury lamp, and mercury and a small amount of argon gas are enclosed in the arc tube 416A. When a voltage is applied between the pair of electrodes, arc discharge occurs in the arc tube 416A, and the evaporated mercury is excited to emit light. As a result, the lamp 416 is turned on.
The arc tube 416A has a bulging portion that bulges outward at the electrode separation portion. An infrared absorption coat C is applied to the outer surface of the base end side of the arc tube 416A (surface on the bottom portion side of the reflector 417) and in the vicinity of the bulging portion.
[0016]
The reflector 417 employs a parabolic mirror, which opens on the right side (light emission side) in the figure and has a bottom portion on the left side in the figure. The reflective film of the reflector 417 is a dielectric multilayer film that reflects visible light and transmits infrared light.
In addition, you may employ | adopt what combined the parallelizing concave lens and the ellipsoidal mirror as a reflector instead of the parabolic mirror.
The IR filter 417A absorbs infrared laser light from a preheating device 10A described later. Thereby, it can prevent that the 1st lens array 412 etc. which are arrange | positioned at the back | latter stage of the light source device 411 are heated with an infrared laser beam.
[0017]
The first lens array 412 has a configuration in which small lenses having a substantially rectangular outline when viewed from the optical axis direction are arranged in a matrix. Each small lens splits the light beam emitted from the lamp 416 into a plurality of partial light beams. The contour shape of each small lens is set so as to be almost similar to the shape of the image forming area of the liquid crystal panel 441. For example, if the aspect ratio (ratio of horizontal and vertical dimensions) of the image forming area of the liquid crystal panel 441 is 4: 3, the aspect ratio of each small lens is also set to 4: 3.
[0018]
The second lens array 413 has substantially the same configuration as the first lens array 412, and has a configuration in which small lenses are arranged in a matrix. The second lens array 413 has a function of forming an image of each small lens of the first lens array 412 on the liquid crystal panel 441 together with the superimposing lens 415.
[0019]
The polarization conversion element 414 is disposed between the second lens array 413 and the superimposing lens 415. Such a polarization conversion element 414 converts the light from the second lens array 413 into a single type of polarized light, thereby improving the light use efficiency in the optical device 44.
[0020]
Specifically, each partial light converted into one type of polarized light by the polarization conversion element 414 is finally superimposed on the liquid crystal panel 441 of the optical device 44 by the superimposing lens 415. In the projector 1 using the liquid crystal panel 441 of the type that modulates polarized light, only one type of polarized light can be used, and therefore approximately half of the luminous flux from the lamp 416 that emits other types of randomly polarized light is not used. For this reason, by using the polarization conversion element 414, all the light beams emitted from the lamp 416 are converted into one kind of polarized light, and the light use efficiency in the optical device 44 is enhanced. Such a polarization conversion element 414 is introduced in, for example, Japanese Patent Application Laid-Open No. 8-304739.
[0021]
The color separation optical system 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423, and a plurality of partial light beams emitted from the integrator illumination optical system 41 by the dichroic mirrors 421 and 422 are red (R) and green. (G) and blue (B) have a function of separating into three color lights.
[0022]
The relay optical system 43 includes an incident side lens 431, a relay lens 433, and reflection mirrors 432 and 434, and has a function of guiding red light, which is color light separated by the color separation optical system 42, to the liquid crystal panel 441R. ing.
[0023]
At this time, the dichroic mirror 421 of the color separation optical system 42 transmits the red light component and the green light component and reflects the blue light component of the light beam emitted from the integrator illumination optical system 41. The blue light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 418, and reaches the blue liquid crystal panel 441B. The field lens 418 converts each partial light beam emitted from the second lens array 413 into a light beam parallel to the central axis (principal ray). The same applies to the field lens 418 provided on the light incident side of the other liquid crystal panels 441G and 441R.
[0024]
Of the red light and green light transmitted through the dichroic mirror 421, the green light is reflected by the dichroic mirror 422, passes through the field lens 418, and reaches the liquid crystal panel 441G for green. On the other hand, the red light passes through the dichroic mirror 422, passes through the relay optical system 43, passes through the field lens 418, and reaches the liquid crystal panel 441R for red light.
The relay optical system 43 is used for red light because the optical path length of the red light is longer than the optical path lengths of the other color lights, thereby preventing a decrease in light use efficiency due to light divergence or the like. Because. That is, this is to transmit the partial light beam incident on the incident side lens 431 to the field lens 418 as it is. The relay optical system 43 is configured to pass red light of the three color lights, but is not limited thereto, and may be configured to pass blue light, for example.
[0025]
The optical device 44 modulates an incident light beam according to image information to form a color image. The optical device 44 includes three incident-side polarizing plates 442 on which the respective color lights separated by the color separation optical system 42 are incident. Liquid crystal panels 441R, 441G, 441B as light modulation devices disposed at the subsequent stage of each incident-side polarizing plate 442, and emission-side polarizing plates 443 disposed at the subsequent stages of the respective liquid crystal panels 441R, 441G, 441B, and color synthesis And a cross dichroic prism 444 as an optical system.
[0026]
The liquid crystal panels 441R, 441G, and 441B use, for example, polysilicon TFTs as switching elements.
In the optical device 44, each color light separated by the color separation optical system 42 is modulated according to image information by the three liquid crystal panels 441R, 441G, 441B, the incident side polarizing plate 442, and the emission side polarizing plate 443. To form an optical image.
[0027]
The incident side polarizing plate 442 transmits only polarized light in a certain direction out of each color light separated by the color separation optical system 42 and absorbs other light beams. A polarizing film is attached to a substrate such as sapphire glass. It has been done. Further, the polarizing film may be attached to the field lens 418 without using the substrate.
The exit-side polarizing plate 443 is configured in substantially the same manner as the incident-side polarizing plate 442, and transmits only polarized light in a predetermined direction out of the light beams emitted from the liquid crystal panel 441 (441R, 441G, 441B), and transmits the other light beams. Absorb. Further, the polarizing film may be attached to the cross dichroic prism 444 without using the substrate.
The incident side polarizing plate 442 and the exit side polarizing plate 443 are set so that the directions of the polarization axes thereof are orthogonal to each other.
[0028]
The cross dichroic prism 444 emits from the exit-side polarizing plate 443, and forms a color image by combining optical images modulated for each color light.
The cross dichroic prism 444 is provided with a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light in a substantially X shape along the interface of four right-angle prisms. Three color lights are synthesized by the multilayer film.
[0029]
[Configuration of Preheating Device 10A]
As described above, the preheating device 10A preheats the lamp 416 by irradiating the lamp 416 with laser light.
As shown in FIG. 2, the preheating device 10 </ b> A is disposed on the side surface side of the reflector 417. The lamp 416 is irradiated with laser light that has passed through the reflector 417.
The preheating device 10A includes a laser beam output unit 11, a drive control unit 12 that drives and controls the laser beam output unit 11 based on an input signal, a laser shutter 13, and an aperture shutter 18.
The drive control unit 12 includes a drive circuit 14 that supplies power supplied from the power source 20 (see FIG. 3) to the laser light output unit 11. The drive control unit 12 drives the laser beam output unit 11 when a power detection unit 22 described later detects the supply of power. Further, the laser light output unit 11 is driven when the light on / off detection unit 23 detects the light off of the lamp 416, and when the light on / off detection unit 23 detects the light on of the lamp 416, the driving of the laser light output unit 11 is stopped.
[0030]
The laser light output unit 11 includes a laser device 15A, a heat sink 16 attached to the laser device 15A, and a collimator lens 17 installed on the optical path of the laser light emitted from the laser device 15A.
The laser device 15A converts the electric power supplied from the drive circuit 14 into infrared laser light and emits it. Although not shown, the laser device 15A includes an infrared semiconductor laser that is a laser light source, a base 151 on which the infrared semiconductor laser is installed, a cap 152 that is fixed to the base 151 and encloses the infrared semiconductor laser. It has. An electrode (not shown) is mounted on the base 151, and power from the drive circuit 14 is supplied to the infrared semiconductor laser via a lead wire.
[0031]
The heat sink 16 is provided to dissipate heat from the laser device 15A.
The collimator lens 17 converts the laser light emitted from the laser device 15 </ b> A into parallel light beams, and emits the parallel light beams toward the lamp 416.
[0032]
The laser shutter 13 is disposed between the laser light output unit 11 and the drive control unit 12, and prevents power supply from the drive circuit 14 to the laser light output unit 11 based on a signal from the drive control unit 12. .
The aperture shutter 18 is provided on the optical path of the laser light emitted from the laser light output unit 11 and at the rear stage of the collimator lens 17. The aperture shutter 18 is a shielding unit that blocks laser light based on a signal from the drive control unit 12.
[0033]
[Detailed configuration of projector 1]
As shown in FIG. 3, the projector 1 having the above-described configuration includes a power source 20, a power detection unit 22 that detects supply of power to the power source 20, and a lighting on / off detection unit 23 that detects lighting on / off of the lamp 416. And have.
The power supply 20 supplies power to the light source device 411, the drive circuit 14 of the laser device 15A, and the like. The power source 20 is supplied with power through a power cable (not shown).
The on / off detection means 23 has an optical sensor and detects the on / off of the lamp 416.
[0034]
Such a projector 1 operates as follows. This will be described with reference to the flowchart of FIG.
(1) When the user inserts a power plug provided on the power cable into an outlet, power is supplied to the power source 20. Then, the power detection unit 22 detects the supply of power (process S1), and the drive control unit 12 drives the laser beam output unit 11 (process S2). As a result, infrared laser light is emitted and the lamp 416 is preheated.
[0035]
(2) When supply of power to the power source 20 is detected again by the power detection means 22 (process S3), the turn-off detection means 23 detects turning on / off of the lamp 416 (process S4).
(3) When the lighting of the lamp 416 is detected, the drive control unit 12 stops the driving of the laser beam output unit 11 (processing S5). Thereby, preheating is complete | finished.
(4) On the other hand, when the extinction of the lamp 416 is detected, preheating by the preheating device 10A is continued.
[0036]
(5) After the preheating device 10A is stopped, the on / off detection means 23 detects the on / off of the lamp 416 again (processing S6).
(6) When the extinction of the lamp 416 is detected, the drive control unit 12 drives the laser beam output unit 11. Thereby, preheating of the lamp | ramp 416 is performed again (process S2).
(7) On the other hand, when the lighting of the lamp 416 is detected, the preheating device 10A remains stopped.
[0037]
(8) After the preheating device 10A is driven, the power detection means 22 detects again the supply of power to the power source 20 (process S3), and the turn-off detection means 23 detects the turning on / off of the lamp 416 (process S4). Thereafter, the processes S5 and S6 are performed again.
(9) When power supply is not detected, that is, when the user pulls out the power plug from the outlet, the operation of the projector 1 ends.
[0038]
Therefore, according to this embodiment, the following effects can be produced.
(1) The lamp 416 can be preheated by emitting and irradiating laser light from the laser light output unit 11 of the preheating device 10A. Thereby, mercury excited by the discharge can be evaporated, and the time until the lamp 416 is completely lit can be shortened.
(2) Since the laser beam can be condensed and the energy density can be increased, the lamp 416 can be heated in a short time, and the time required for lighting can be shortened more effectively. .
(3) Further, when a laser is used, the lamp 416 can be sufficiently preheated with about 1 to 2 W, so that energy saving can be achieved.
[0039]
(4) In the present embodiment, an infrared semiconductor laser is used as the laser light source. However, since the semiconductor laser is smaller than other laser light sources, the preheating device 10A can be downsized. Further, since the size can be reduced in this way, even if the preheating device 10A is mounted on the projector 1, the projector 1 does not increase in size.
(5) Furthermore, since the infrared semiconductor laser is inexpensive, the cost of the preheating device 10A can be reduced.
[0040]
(6) Since the laser shutter 13 and the aperture shutter 18 are provided, the laser beam can be prevented from being unexpectedly emitted, and the safety of the preheating device 10A can be improved.
(7) In addition, a laser shutter 13 is provided between the drive control unit 12 and the laser beam output unit 11, and an aperture shutter 18 is provided after the laser beam output unit 11 to prevent laser beam emission in two stages. Since it can, safety can be improved more.
[0041]
(8) When the reflecting film of the reflector 417 is a film that does not transmit infrared rays, such as aluminum, the preheating device 10A must be installed on the opening side of the reflector 417 in order to allow the infrared laser beam to reach the lamp 416. I must. In the present embodiment, since the reflective film of the reflector 417 is a dielectric multilayer film that reflects visible light and transmits infrared light, the preheating device 10 </ b> A can be installed on the side surface side of the reflector 417.
(9) Since the infrared ray absorbing coat C is applied to the arc tube 416A, when the infrared ray absorbing coat C is irradiated with the infrared ray laser beam, it is absorbed and the arc tube 416A can be warmed more efficiently. Therefore, the preheating time can be shortened and energy can be saved.
[0042]
(10) When the drive control unit 12 of the preheating device 10A detects the supply of power to the power source 20 by the power detection means 22, the drive control unit 12 drives the laser light output unit 11 and sufficiently preheats the lamp 416 before turning it on. It is possible.
(11) When the on / off detection means 23 detects that the lamp 416 is turned on, the laser light output unit 11 is stopped driving. Therefore, when the lamp 416 is turned on, the laser light is not emitted, thereby saving energy. Can be planned.
[0043]
(12) Further, when the lamp 416 is turned off, this is detected by the lighting on / off detecting means 23, and the preheating device 10A is driven again. Accordingly, even after the lamp 416 is turned off, the lamp 416 is in a preheated state, so that it can be turned on again in a short time.
[0044]
(13) Since the IR filter 417A is provided on the opening side of the reflector 417, the laser light emitted from the preheating device 10A is incident on the first lens array 412 and the like, and the first lens array 412 and the like are heated by the laser light. Can be prevented.
[0045]
Next, a second embodiment of the present invention will be described with reference to FIG. In the following description, the same parts as those already described are denoted by the same reference numerals and the description thereof is omitted.
In the embodiment, the laser device 15A of the preheating device 10A includes an infrared semiconductor laser, but the laser device 15B of the preheating device 10B of the present embodiment includes a red semiconductor laser. From this preheating device 10B, visible red laser light is emitted.
Unlike the above-described embodiment, the arc tube 416A is not provided with the infrared absorption coat C.
Further, the reflective film of the reflector 417 is a dielectric multilayer film that reflects visible light. The preheating device 10B is disposed on the opening side of the reflector 417, and the laser light emitted from the preheating device 10B is incident from the opening of the reflector 417 and applied to the lamp 416.
Moreover, in the said embodiment, although the lighting on / off detection means 23 which detects the lighting on / off of the lamp | ramp 416 was provided, the lighting on / off detection means 23 is not provided in this embodiment. That is, in the present embodiment, the preheating device 10B is driven when power is supplied to the power source 20 regardless of whether the lamp 416 is turned on or off.
[0046]
According to this embodiment, in addition to the same effects as (1) to (7) and (10) of the above embodiment, the following effects can be obtained.
(14) In the present embodiment, as long as power is supplied to the power supply 20, the preheating device 10B continues to be driven. Therefore, since the red laser beam is emitted even while the lamp 416 is lit, the red laser beam is reflected by the reflector 417 and added to the light beam emitted from the lamp 416. Therefore, the red color coordinate of the projected image can be improved.
[0047]
It should be noted that the present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved.
For example, in the above-described embodiment, the power detection unit 22 is provided, and the preheating devices 10A and 10B are driven at the same time as the power is supplied to the power source 20. However, the present invention is not limited to this, for example, the preheating devices 10A and 10B. A drive switch may be provided. In this case, since the preheating devices 10A and 10B are not driven even when power is supplied to the power source 20, the preheating devices 10A and 10B do not operate even if the plug is forgotten to be unplugged from the outlet. Can be achieved.
[0048]
Further, in the first embodiment, the lighting / light-off detecting means 23 provided with the optical sensor detects the lighting / light-off of the lamp 416. However, the present invention is not limited to this. For example, a temperature sensor is provided and the lamp 416 is below a predetermined temperature. In such a case, the preheating device 10A may be driven, and the preheating device 10A may be stopped when the temperature exceeds a predetermined temperature. In addition, a timer or the like may be provided, and the preheating device 10A may be automatically stopped when a predetermined time has elapsed after power is supplied to the power source 20.
[0049]
In the first embodiment, the arc tube 416A of the lamp 416 is provided with the infrared absorption coat C, but the infrared absorption coat C may not be provided. In this way, it is not necessary to coat the arc tube 416A, so that it is possible to save labor for manufacturing.
In the first embodiment, the preheating device 10A is disposed on the side surface side of the reflector 417. However, the present invention is not limited to this. For example, the preheating device 10A may be disposed on the bottom side of the reflector 417.
[0050]
In the first embodiment, the reflective film of the reflector 417 is a dielectric multilayer film that reflects visible light and transmits infrared light. However, the reflective film has a function of reflecting the visible light by the reflector 417. For example, a film made of aluminum or the like that reflects not only visible light but also infrared light may be used. In this case, the preheating device 10 </ b> A may be disposed on the opening side of the reflector 417 and the lamp 416 may be irradiated with infrared laser light through the opening of the reflector 417.
[0051]
Et al is, in the embodiment, an infrared semiconductor laser, was used a red semiconductor laser, this not limited, may be a blue semiconductor laser or the like.
Further, the laser light source may be a solid, liquid, gas or the like instead of a semiconductor. However, when a solid, liquid, or gas is used as the laser light source, the preheating device may be larger than when a semiconductor is used.
[0052]
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an optical system according to a first embodiment of the present invention.
FIG. 2 is a schematic view showing the preheating device of the embodiment.
FIG. 3 is a block diagram showing a preheating device.
FIG. 4 is a diagram showing a flow of operation of the projector.
FIG. 5 is a schematic diagram showing a preheating device according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Projector, 10A, 10B ... Preheating apparatus, 11 ... Laser beam output part, 12 ... Drive control part, 18 ... Aperture shutter, 20 ... Power supply, 22 ... Electric power detection means, 23 ... Turning on / off detection means, 411 ... Light source device 416 ... Lamp, 416A ... Arc tube, 417 ... Reflector, 441 (441R, 441G, 441B) ... Liquid crystal panel, C ... Infrared absorbing coating

Claims (5)

A preheating device that preheats a discharge-type light source, a light source device including the light source, and a light modulation device that modulates a light beam emitted from the light source device according to input image information to form an optical image. A projector ,
The preheating device is:
A laser beam output unit for emitting a laser beam to the light source;
A drive control unit that performs drive control of the laser light output unit based on an input power signal ;
A projector , comprising: a shielding unit that is provided on an optical path of laser light emitted from the laser light output unit and blocks the laser light based on a control signal from the drive control unit . The projector according to claim 1,
The laser beam output unit, the projector characterized by comprising a red semiconductor laser or infrared laser. The projector according to claim 1, wherein
The laser beam output unit of the preheating device includes an infrared semiconductor laser,
The light source device has a reflector that reflects the light emitted from the light source,
The projector according to claim 1, wherein the reflective film is a dielectric multilayer film that reflects visible light and transmits infrared light. The projector according to claim 1 or 3,
The laser beam output unit of the preheating device includes an infrared semiconductor laser,
The light source of the light source device includes a light emitting unit main body and an arc tube surrounding the light emitting unit main body,
A projector characterized in that an infrared ray absorbing coat is applied to the arc tube. The projector according to any one of claims 1 to 4,
Power detection means for detecting the supply of power to the power supply of the projector, and lighting on / off detection means for detecting turning on / off of the light source,
The drive control unit of the preheating device drives the laser beam output unit when detecting the supply of power to the power source by the power detection unit,
When the light on / off detection means detects that the light source is turned on, the projector stops driving the laser light output unit.

Images