JP5068474B2 - Projection display - Google Patents

Description

  The present invention relates to a projection display device, and more particularly to a technique for operating a light source included in a projection display device more safely.

  The projection display device displays an image on a screen by modulating light emitted from a light source and projecting the modulated light onto the screen via an imaging optical system. Here, a high-pressure discharge lamp (hereinafter sometimes abbreviated as “lamp”) such as a halogen lamp, a xenon lamp, a metal halide lamp, or an ultra-high pressure mercury lamp is used as the light source. These high-pressure discharge lamps have an arc tube, a base, lead wires, and electrodes as main members. Further, the discharge tube and other necessary substances are sealed in the arc tube and pressurized to about 200 atm. Therefore, if the arc tube ruptures due to deterioration over time or the like, there is a risk that the fragments or encapsulated material (mercury in the case of an ultra-high pressure mercury lamp) will be scattered around. Therefore, safety is assured by prompting the user to replace the light source or forcibly turning off the light source before the light source reaches the end of its life or when a malfunction occurs in the light source.

  For example, Patent Document 1 discloses a technique for integrating the lighting time of a light source and automatically turning off the driving power source of the light source when the accumulated time reaches a certain time. Japanese Patent Laid-Open No. 2004-228688 acquires or determines the driving condition of the replaced light source lamp when the light source lamp is replaced, and sets the driving condition in the projector so that the lamp is operated under conditions suitable for the replaced light source lamp. Techniques for driving the are disclosed. Further, in Patent Document 3, the interelectrode voltage of the light source lamp is detected, the detected voltage is compared with an initial value, and the light source lamp is turned off when the difference exceeds a predetermined value. A technique for preventing the explosion from occurring in advance is disclosed.

As described above, many techniques for securing the safety of the light source of the projection display device have been proposed. However, the usage environment greatly affects the lifetime of the light source and the occurrence of defects. In particular, a high-pressure discharge lamp generates a large amount of heat when it is lit, and the temperature of the arc tube becomes a high temperature of 1000 ° C. or more. May occur. Therefore, a projection display device must have a cooling mechanism for cooling the light source, and currently an air-cooling type cooling mechanism is widely adopted. Of course, a liquid-cooling type cooling mechanism may be employed in a projection display apparatus that uses a high-power xenon lamp of about 10 kW as a light source.
Japanese Patent Laid-Open No. 04-5622 JP 2004-85749 A JP 2005-128402 A

  As described above, almost all projection display devices include a cooling mechanism for cooling the light source. However, the cooling capacity and operating conditions of the cooling mechanism are determined on the assumption of a predetermined light source. Specifically, the cooling capacity and operating conditions of the cooling mechanism are determined based on the amount of heat generated by the light source mounted at the time of factory shipment, the usage environment, and the like, and a cooling mechanism that satisfies the capacity and conditions is mounted. However, as is clear from the proposal of a technique for prompting the replacement of the light source before reaching the end of its life, the light source is a consumable item and is replaced as necessary. At the time of this replacement, the light source is not necessarily replaced with the same light source that was mounted at the time of shipment from the factory. For example, the projector may be replaced with a light source other than a light source (so-called genuine product) supplied to the market by a producer of the projection display device or a person who has obtained permission from the producer.

  Furthermore, the light source used in the projection display apparatus is often housed in a housing together with a reflector for collecting the light emitted from the light source, and it is necessary to replace the light source for each unit. There are many things. In such a case, there is a possibility that the reflector shape, the thickness and reflectance of the reflection film on the reflector inner surface, and the reflection / transmission spectrum, etc., may be replaced with a reflector different from those of the reflector mounted at the factory. . For example, as a result of replacement with a unit other than a unit (so-called genuine product) supplied to the market by the producer of the projection display device or a person who has obtained permission from the producer, a reflector other than a predetermined reflector is attached. In some cases. When a reflector other than the predetermined reflector is attached, the wind speed and flow path of the cooling air supplied to the light source, the radiant heat from the reflector, and the heat capacity may change. In particular, when the predetermined reflector is a cold type, but the replaced reflector is not a cold type, there is a possibility that infrared light is reflected back to the light source and the light source is overheated.

  As described above, if a light source or reflector other than a predetermined light source or reflector is attached, the cooling condition may deviate from the range assumed when designing the cooling mechanism, and the light source may fall under cooling. Continuing to use the lamp significantly shortens the life of the light source and increases the risk of the arc tube bursting.

  The present invention has been made in view of the above problems, and provides a projection display device that operates safely without causing insufficient cooling even when a light source or reflector other than a predetermined light source or reflector is attached. For the purpose.

  The projection display device of the present invention that achieves the above object has a determining means for determining whether or not a light source or reflector that is mounted is a predetermined light source or reflector, and the light source or the like is not a predetermined one. If so, the light source is cooled more strongly. The discriminating unit does not need to confirm that the mounted light source or reflector is the same as the predetermined light source or the like, and only needs to confirm that it is not the predetermined light source or reflector. This is because when a device other than a predetermined light source or reflector is mounted, the amount of heat generation exceeds the cooling capacity of the cooling means mounted on the projection display device, which may cause insufficient cooling. Of course, there is a possibility that cooling will not be insufficient. However, when there is a possibility of insufficient cooling, it is possible to reliably avoid insufficient cooling by cooling the light source more strongly. Here, “cooling the light source more strongly” means cooling in the direction of further cooling the light source. Specifically, when an air-cooling type cooling means is provided, it means increasing the amount and flow rate of the cooling air, lowering the temperature of the cooling air, or the like. Further, when a liquid cooling type cooling means is provided, it means that the temperature of the cooling liquid is lowered or the flow rate is increased. In addition, when a plurality of cooling means are provided, it means increasing the number of cooling means to be operated.

In the present invention, as a method for determining whether or not the light source or reflector is a predetermined light source or reflector, the following method may be mentioned.
(First method)
The spectral distribution of the ultra-high pressure mercury lamp depends on the amount of mercury enclosed in the lamp. The higher the amount of mercury (the higher the mercury pressure), the longer the emission of the continuous spectrum and the larger the half-value width of the emission line spectrum. This amount of mercury depends on the vendor of the ultra high pressure mercury lamp and its type. Therefore, it is possible to discriminate the lamp by capturing a characteristic wavelength in the spectral distribution of a predetermined ultrahigh pressure mercury lamp and measuring the amount of light at that wavelength. Specifically, when the light emitted from the lamp is received by the semiconductor light receiving element through a filter that transmits only light of a specific wavelength, the intensity of the light of the specific wavelength can be determined. By measuring the light intensity for a necessary wavelength by this method, the spectral distribution of the lamp can be determined, and the lamp can be discriminated based on the spectral distribution.
(Second method)
A general projection display device includes a cold reflector for collecting light emitted from a light source. A cold reflector is a reflector having a reflective film on its inner surface that transmits infrared light and reflects visible light. The light emitted from the light source passes through the reflector, and the transmitted light reflects the wavelength dependence of the transmittance of the reflector reflecting film. Usually, the reflective film is composed of a multilayer film, and the film structure differs depending on the manufacturer. The reflection spectrum in the visible light region is not very different, but the transmittance in the infrared region and the ultraviolet region is often very different. . Therefore, the light source and the reflector can be discriminated by comparing the spectra of the light transmitted through the reflector (transmitted light).
(Third method)
By providing a switch that is turned on or off by the magnetic force of the magnet provided on the light source side, the light source and the reflector can be discriminated depending on whether the switch is on or off.
(Fourth method)
By providing information on the light source side and reading the information on the apparatus side, the light source and the reflector can be determined. Means for providing information to the light source can be realized by providing a nonvolatile semiconductor memory storing information or an RFID (Radio Frequency Identification) chip on the light source side. At this time, if these pieces of information are encrypted, forgery of the identification information can be effectively prevented.

The projection display device of the present invention is characterized in that it has a discriminating means for discriminating a light source and a reflector based on any one of the first to fourth methods or two or more methods. Specifically, a first projection display device of the present invention is a projection display device in which both or one of a light source and a reflector that collects light emitted from the light source can be replaced, and is mounted. Cooling means for cooling the light source, determination means for determining whether or not the mounted light source and / or reflector is a genuine product , and control means for controlling the cooling means based on the determination result by the determination means And the control means controls the cooling means so that the light source is cooled more strongly when the discriminating means discriminates that the mounted light source and / or reflector is not a genuine product .

The second projection display device of the present invention has a determining means for determining whether or not the light source is a genuine product based on the spectrum of the light emitted from the mounted light source.

The third projection display device according to the present invention is configured to determine whether or not the light source and / or the reflector is a genuine product based on a spectrum of light emitted from the mounted light source and transmitted through the reflector. Have means.

A fourth projection display device according to the present invention includes a switch that is turned on or off by the magnetic force of a magnet provided in a mounted light source, and is based on whether the switch is on or off. And a discriminating means for discriminating whether or not the mounted light source and / or the reflector is a genuine product .

A fifth projection display device of the present invention includes a reading unit that reads information stored in an IC chip provided in a mounted light source. Based on the read information, the mounted light source and And / or a discriminating means for discriminating whether or not the reflector is a genuine product .

  According to the projection display device of the present invention, when a light source or reflector other than a predetermined light source or reflector is mounted, the light source is cooled more strongly, so that insufficient cooling of the light source is avoided, and the safety of the projection display device is avoided. The property is further improved.

(Embodiment 1)
Hereinafter, an example of the embodiment of the projection display device of the present invention will be described. FIG. 1 is a plan view showing the internal structure of the projection display apparatus of this example. The projection display device includes a housing 10 and an optical engine 20 (a portion surrounded by a dotted line in the drawing) including a light source unit 21 housed in the housing 10, an electrical component, a mechanical component, and the like. ing.

  FIG. 2 is an enlarged view showing a part of the optical engine 20 and components disposed around the optical engine 20. In the optical engine 20, a light source unit 21, an integrator (not shown), a color separation means (not shown), a light source cooling fan 23, an optical element 24, an image forming element 25, a projection lens 26, and the like are arranged on an opt base 22. It is. However, the light source cooling fan 23 may be fixed not to the opto base 22 but to the housing 10 or the like.

  The image forming element 25 is a digital micromirror element (DMD element) provided with a large number of micromirrors corresponding to pixels. The image forming element 25 is irradiated with light emitted from the light source unit 1 and color-separated in a time division manner by the color separation unit.

  The light source unit 21 includes a lamp, a reflector, a lamp housing, and the like. A 220 [W] ultra-high pressure mercury lamp is used as the lamp. This lamp is integrated with the reflector and housed in the lamp housing. Further, the light source unit 21 is provided with a power connector (not shown). On the other hand, a connector is also provided on the opto base 22 side at a position opposite to the electrical connector of the light source unit 21. When the light source unit 21 is mounted on the opto base 22, both connectors are connected and power is supplied to the lamp. .

  Here, since the lamp is a consumable item, the light source unit 21 can be attached to and detached from the optical engine 20 (the opt base 22). That is, the lamps can be replaced together with the light source unit 21. FIG. 3 is a diagram illustrating a state in which the light source unit 21 is attached to the optical engine 20. The light source unit 21 can be attached to and detached from a receiving portion 22 a formed on the base 22 from below the opto base 22. Further, the accommodating portion 22a of the opt base 22 is provided with a side window 22b. When the lamp is turned on, a part of the light (light that is not transmitted through the reflector) is emitted from the side window 22b.

  As shown in FIG. 4, a light source sensor 30 is disposed outside the side window 22b, and a spectrum of light emitted from the side window 22b can be obtained. The configuration of the light source sensor 30 is shown in FIG. The light source sensor 30 includes three optical sensors (optical sensors 31, 32, and 33). A wavelength selection filter (optical filter) is provided in the light receiving portion of each of the optical sensors 31, 32, and 33 so that light of different wavelengths can be detected. Specifically, an optical low-pass filter (blue transmission filter) having a cut wavelength of 490 [nm] is provided in the light receiving portion of the optical sensor 31. Further, an optical high-pass filter (red transmission filter) having a cut wavelength of 590 [nm] is provided in the light receiving portion of the optical sensor 33. Furthermore, an optical filter (green transmission filter) in which an optical high-pass filter with a cut wavelength of 490 [nm] and an optical low-pass filter with a cut wavelength of 590 [nm] are stacked is provided in the light receiving portion of the optical sensor 32. It has been. With such a configuration, it is possible to measure the intensity of light of each wavelength of blue, red, and green, which are the three primary colors.

  Here, the emission spectrum of the ultra high pressure mercury lamp varies depending on the mercury pressure. Therefore, it is possible to determine whether or not the lamp is a predetermined lamp by measuring the intensity of two or more lights having different wavelengths and obtaining the ratio thereof. In particular, the change in light intensity due to mercury pressure appears remarkably at wavelengths of 407 [nm], 436 [nm], 546 [nm], and 578 [nm]. Therefore, the ratio between the intensity of the specific wavelength light and the intensity of the other wavelength light is particularly effective as a marker for discriminating the lamp.

  In this example, the optical sensor 31 measures the intensity of light having a wavelength of 436 [nm] (first wavelength light). Further, the optical sensor 32 measures the intensities of light having a wavelength of 546 [nm] (second wavelength light) and light having a wavelength of 578 [nm] (third wavelength light). Further, the optical sensor 33 measures the intensity of light (fourth wavelength light) in a wavelength region that does not depend on mercury pressure having a wavelength of 590 [nm] or more. Then, the measurement results of the optical sensors 31, 32, 33 are input to the determination unit 40.

  The determination unit 40 compares the input measurement results of the optical sensors 31, 32, and 33 with the reference value stored in the storage unit 41. Specifically, the ratio of the intensity of the first wavelength light to the third wavelength light with respect to the intensity of the fourth wavelength light is obtained, and the obtained intensity ratio is compared with the reference value stored in the storage unit 41. The reference value refers to the first wavelength light to the fourth wavelength light with respect to the intensity of the fourth wavelength light emitted from a predetermined lamp (in this example, an ultrahigh pressure mercury lamp mounted when the projection display device is shipped from the factory). It is a value indicating the ratio of the intensity of the three-wavelength light. Therefore, if the intensity ratio determined based on the measurement result matches the reference value, the currently installed lamp is an ultra high pressure mercury lamp having the same mercury pressure as the ultra high pressure mercury lamp installed at the time of shipment from the factory. It is estimated that. On the other hand, if the intensity ratio obtained based on the measurement result does not match the reference value, the currently installed lamp is a lamp having a mercury pressure different from the ultrahigh pressure mercury lamp installed at the time of factory shipment. It is guessed.

  Therefore, the determination unit 40 outputs a predetermined signal to the fan control unit 42 when the intensity ratio obtained based on the measurement result does not match the reference value. The fan control unit 42 to which the signal is input controls the driving source (motor 43) of the light source cooling fan 23 so that the rotational speed of the light source cooling fan 23 (FIG. 2) increases. However, when the intensity ratio obtained based on the measurement result does not match the reference value, the signal output from the determination unit 40 can be stopped. In this case, the fan control unit 42 controls the motor 43 so that the number of rotations of the light source cooling fan 23 is increased with the signal input being interrupted as a trigger. In this example, a sirocco fan having an outer shape of 50 mm is used as the light source cooling fan 23. The sirocco fan can adjust the number of rotations by changing the voltage applied to the motor 43, and the amount of blown air varies according to the number of rotations. The fan controller 42 normally applies a voltage of 8.0 [V] to the motor 43 and operates the light source cooling fan 23 at a rotational speed of 4200 [rpm]. On the other hand, when the predetermined signal is input or the input of the predetermined signal is interrupted, the applied voltage is increased to 12 [V], and the light source cooling fan 23 is operated at a rotational speed of 5700 [rpm]. As a result, the amount of cooling air supplied to the light source unit 21 via the duct 28 shown in FIG. 2 increases, and the lamp is cooled more strongly. If the voltage applied to the motor 43 is increased to the maximum value (13.8 [V] in this example), the rotational speed becomes 6300 [rpm], and the cooling effect is further improved.

  As described above, when a lamp different from the ultra-high pressure mercury lamp mounted at the time of shipment from the factory is mounted, the rotational speed of the light source cooling fan 23 automatically increases. As a result, the amount of cooling air increases, the lamp is cooled more strongly, and insufficient cooling of the lamp is avoided.

  In the case where the light source sensor 30 is arranged at a later stage than the color separation means, it is sufficient that the light source sensor 30 includes any one of the optical sensors 31, 32, and 33, and the wavelength of the optical sensor is included in the optical sensor. There is no need to provide a selection filter. This is because the DMD element is sequentially irradiated with blue, green, red, and transparent color lights that have been color-separated in a time-division manner by the color separation means. Therefore, if the light intensity is measured in synchronization with the timing of color separation by the color separation means and the result is stored, the intensity of each color light of blue, green, red and transparent is measured by one optical sensor. be able to. However, when an optical sensor is arranged on the optical path between the color separation means and the DMD element, a part of the illumination light is blocked by the optical sensor, and the illumination efficiency is lowered. Here, in principle, the DMD element generates light (ON light) that enters the projection lens and forms an image on the screen, and unnecessary light (OFF light) that does not enter the projection lens. And each color light switches sequentially also about off light. Therefore, if the light sensor is arranged at a position where the off-light is irradiated (for example, the inner surface of the off-light shielding plate), the intensity of each color light can be measured with one light sensor without reducing the illumination efficiency. it can.

A color wheel is generally used as the color separation means. The color wheel is provided with four color filters of blue, green, red, and transparent, and these color filters time-separate and separate light by rotating so as to sequentially traverse the optical path of light applied to the DMD element.
(Embodiment 2)
Hereinafter, another example of the embodiment of the projection display device of the present invention will be described. The projection display device of this example has the same basic configuration as the projection display device of the first embodiment. Therefore, description of common configurations is omitted, and only different configurations are described below.

  As shown in FIG. 6A, in the projection display device of this example, the light source sensor 30 is on the outer surface of the reflector of the optical unit 21, and the light emitted from the lamp does not enter directly. Placed in position. Here, the reflector is a cold mirror, and has a characteristic of reflecting visible light but transmitting infrared or ultraviolet light. This reflection / transmission characteristic depends on the characteristic of the reflective film provided on the inner surface of the reflector or the material of the reflector. For example, even if the same 220 [W] ultra-high pressure mercury lamp is used, if the reflector is different, the light intensity in the ultraviolet region and the infrared region of the light transmitted through the reflector is different. That is, the light source sensor 30 in this example measures the intensity of light emitted from a lamp and transmitted through a filter called a reflector.

  Specifically, an optical low-pass filter (ultraviolet transmission filter) having a cut wavelength of 450 [nm] is provided in the light receiving portion of the optical sensor 31. The light receiving portion of the optical sensor 33 is provided with an optical high-pass filter (infrared transmission filter) having a cut wavelength of 700 [nm]. The light receiving portion of the optical sensor 32 is provided with an optical high-pass filter with a cut wavelength of 450 [nm], an optical low-pass filter with a cut wavelength of 700 [nm], and a laminated filter (visible light transmission filter). Therefore, it is possible to determine whether or not the lamp or / and the reflector are predetermined by comparing the light intensity measured by each of the optical sensors 31, 32, and 33 with a reference value. The determination method is basically the same as that of the first embodiment, and the measurement result of the optical sensor is compared with the reference value stored in the storage unit 41 (FIG. 5). However, the reference value here is emitted from a predetermined lamp (in this example, an ultra-high pressure mercury lamp that is mounted when the projection display device is shipped from the factory), and a predetermined reflector (in this example, It is a value indicating the intensity of ultraviolet rays, infrared rays, and visible rays of light transmitted through a reflector that is mounted when the projection display device is shipped from a factory.

In the projection display apparatus of the present example having the above configuration, it is possible to determine not only the lamp but also whether or not the reflector is a predetermined reflector. If the lamp and / or the reflector is other than the predetermined one, the light source cooling The rotational speed of the fan 23 is automatically increased. From the above description, it can be easily understood that the light source sensor 30 may or may not be in close contact with the outer surface of the reflector. That is, the light source sensor 30 may be disposed at a position where light emitted from the lamp and transmitted through the reflector can enter. For example, as shown in FIG. 6B, an opening 51 may be formed in the member 50 arranged around the reflector, and the light source sensor 30 may be arranged so as to close the opening 51. The member 50 does not need to be specially provided for installing the light source sensor 30, and a member provided for protecting the light source unit 21 or a member provided for fixing the light source unit 21 may be used. it can.
(Embodiment 3)
Hereinafter, another example of the embodiment of the projection display device of the present invention will be described. The projection display device of this example has the same basic configuration as the projection display device of the first embodiment. Therefore, description of common configurations is omitted, and only different configurations are described below.

  As shown in FIG. 7, a magnet 60 is embedded in the lamp housing of the light source unit 21 constituting the projection display device of this example. Further, the opto base 22 is provided with a reed switch 61 in which a movable contact is accommodated in a glass tube. The reed switch 61 is provided at a position facing the magnet 60 or in the vicinity thereof when the light source unit 21 is accommodated in the accommodating portion 22 a of the opto base 22.

In the projection display device of the present example having the above configuration, when the light source unit 21 is mounted on the opto base 22, the movable contact of the reed switch 61 is displaced by the action of the magnetic force of the magnet 60, and the switch is turned on (conduction). State). On the other hand, when the light source unit mounted on the opto base 22 does not include a magnet, the reed switch 61 is not turned on and the non-conducting state is maintained. Therefore, when the reed switch 61 is in the on state, the determination unit 40 (FIG. 5) determines that the currently mounted lamp is the same lamp that is mounted at the time of shipment from the factory, and the reed switch 61 is in the off state. In this case, it is determined that the currently mounted lamp is different from the lamp mounted at the time of factory shipment. Further, the fan control unit 42 operates the light source cooling fan 23 as usual when it is determined that the currently installed lamp is the same as the lamp installed at the time of factory shipment, and is installed at the time of factory shipment. If it is determined that the lamp is different from the lamp, the rotational speed of the light source cooling fan 23 is increased.
(Embodiment 4)
Hereinafter, another example of the embodiment of the projection display device of the present invention will be described. The projection display device of this example has the same basic configuration as the projection display device of the first embodiment. Therefore, description of common configurations is omitted, and only different configurations are described below.

  As shown in FIG. 8, an IC chip 70 is embedded in the lamp housing of the light source unit 21 constituting the projection display device of this example. Further, the opto base 22 is provided with a reading unit 71 that comes into contact with the IC chip 70 when the light source unit 21 is mounted.

  In the projection display apparatus of the present example having the above configuration, when the light source unit 21 is mounted on the opto base 22, the identification information written in the IC chip 70 is read out via the reading unit 71, and the determination unit 40 (FIG. 5). The determination unit 40 collates the input identification information with the identification information stored in the storage unit 42. If they match, the currently mounted lamp is the same as the lamp mounted at the time of factory shipment. If the lamps do not match, it is determined that the currently mounted lamp is different from the lamp mounted at the time of factory shipment. The control of the light source cooling fan 23 based on the determination result by the determination unit 40 is the same as in the third embodiment.

  So far, the example of the embodiment of the present invention has been described by taking the case where the lamp is an ultra-high pressure mercury lamp as an example. This is because the ultra-high pressure mercury lamp is most popular as the light source of the projection display device, and suggests that the scope of the present invention is limited to the projection display device using the ultra-high pressure mercury lamp as the light source. It is not a thing. The present invention is also applicable to a projection display apparatus using a xenon lamp or other lamp as a light source.

  Further, an example of the embodiment of the present invention has been described so far by taking an air cooling type cooling means as an example. However, the cooling means may be a liquid cooling type. Furthermore, a cooling means using both air cooling and liquid cooling may be provided.

  In the above, an example of the embodiment of the present invention has been described taking the case where the image forming element is a DMD element as an example. However, the image forming element is not limited to the DMD element, and may be a liquid crystal panel or the like.

It is a top view which shows an example of embodiment of the projection type display apparatus of this invention. FIG. 2 is an enlarged view showing a part of the optical engine of FIG. 1 and mechanical parts arranged around the optical engine. It is the side view which showed a mode that the light source unit was mounted | worn to an opto base. It is a side view which shows arrangement | positioning of a light source sensor. It is a block diagram which shows the structural example of a discrimination means. It is a partial expanded side view which shows the other example of embodiment of the projection type display apparatus of this invention. It is a partial expanded side view which shows the other example of embodiment of the projection type display apparatus of this invention. It is a partial expanded side view which shows the other example of embodiment of the projection type display apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Case 20 Optical engine 21 Light source unit 22 Opt base 23 Light source cooling fan 24 Optical element 25 Image formation element 26 Projection lens 27 Off-light shielding board 28 Duct 30 Light source sensor 31, 32, 33 Optical sensor 40 Discriminating part 41 Memory | storage part 42 Fan control unit 43 Motor 50 Member 60 Magnet 61 Reed switch 70 IC chip 71 Reading unit

Claims (5)

A projection display device in which both or one of a light source and a reflector that collects light emitted from the light source can be exchanged,
A cooling means for cooling the mounted light source;
A discriminating means for discriminating whether or not the mounted light source and / or reflector is a genuine product ;
Control means for controlling the cooling means based on the determination result by the determination means,
The projection display device that controls the cooling unit so that the light source is cooled more strongly when the determination unit determines that the mounted light source and / or reflector is not a genuine product . The projection display device according to claim 1, wherein the determination unit determines whether or not the light source is a genuine product based on a spectrum of light emitted from the mounted light source. The projection display according to claim 1, wherein the determination unit determines whether the light source and / or the reflector is a genuine product based on a spectrum of light emitted from a mounted light source and transmitted through the reflector. apparatus. The discriminating means has a switch that is turned on or off by the magnetic force of a magnet provided in the mounted light source and / or reflector, and is mounted based on whether the switch is on or off. The projection display device according to claim 1, wherein it is determined whether or not the light source and / or the reflector is a genuine product . The discriminating means has a reading means for reading information stored in an IC chip provided in the mounted light source and / or reflector, and based on the read information, the mounted light source and / or The projection display device according to claim 1, wherein it is determined whether or not the reflector is a genuine product .

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