JP2010210742A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector which appropriately copes with abnormality in an illumination state, such as deterioration of a lamp before standard exchange time. <P>SOLUTION: In the projector 10, a control section 98 reports state change of illumination light (concretely speaking, deterioration of a lamp body 22a), and adjusting a projection state of an image (concretely speaking, correction of color balance), based on output of light sensors 81 to 85 for detecting the illumination light, and thereby, warning and rationalization of operation etc., which directly reflect the state of the illumination light emitted from an illumination section 20, are made possible. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projector that projects an image formed by illuminating a light valve with a lighting device onto a screen.

  As a projector, there is a projector that includes a light source lamp, a liquid crystal panel, and a projection lens, measures the accumulated usage time of the light source lamp, and calculates and displays the remaining time with respect to the scheduled replacement time of the light source lamp (for example, Patent Document 1). reference).

JP 2002-287243 A

  However, in the method of calculating the remaining time with respect to the scheduled replacement time as in the above projector, since the replacement guidance is not given even if the lamp deteriorates before the standard scheduled replacement time, the user has deteriorated the lighting. There is a possibility to continue using the projector in the state.

  Therefore, an object of the present invention is to provide a projector that can appropriately cope with a change in the illumination state such that the lamp deteriorates before the standard replacement time.

  In order to solve the above-described problems, a projector according to the present invention includes an illumination device that emits illumination light, a light valve that modulates illumination light emitted from the illumination device according to image information, and an image. A projection optical system for projecting an image formed by the optical sensor, an optical sensor for detecting illumination light that passes through a predetermined position on the optical path, a change in the state of the illumination light based on the output of the optical sensor, and an image And a control unit that performs at least one of adjusting the projection state.

  In the projector, the control unit performs at least one of notifying the change in the state of the illumination light and adjusting the projection state of the image based on the output of the optical sensor that detects the illumination light. Notification and adjustment that directly reflects the state of the emitted illumination light are possible. Specifically, the projector according to the present invention monitors the occurrence of an abnormality such as a decrease in luminance of the illumination light or a fluctuation in luminance, and an alarm that notifies the abnormality reflecting the result, and correction of the operation for eliminating such an abnormality. It is possible to take appropriate measures including the above.

  According to a specific aspect or aspect of the present invention, in the projector, the control unit notifies a decrease in luminance of illumination light emitted from the illumination device. In this case, it can be notified that the light emission characteristics of the light source lamp are abnormally lowered, for example, and the operating status of the projector can be properly grasped by the user or the like.

  According to another aspect of the present invention, the control unit notifies that the deterioration of the lamp incorporated in the lighting device has exceeded a predetermined limit. In this case, it can be notified that the light source lamp has reached the end of its life, and an appropriate replacement time for the light source lamp can be suggested.

  According to still another aspect of the present invention, the control unit notifies a decrease in luminance of illumination light emitted from the illumination device as image information in the display image. In this case, visual warning information can be clearly communicated to the user.

  According to still another aspect of the present invention, the control unit notifies the decrease in luminance of the illumination light emitted from the illumination device as audio information. In this case, auditory warning information can be easily transmitted to the user.

  According to still another aspect of the present invention, the control unit monitors at least one of the luminance, color balance, and flicker of illumination light during steady operation. In this case, it becomes possible to perform feedback control and alarm reporting by monitoring various operating states of the projector.

  According to still another aspect of the present invention, the control unit includes a storage unit that stores information related to the state change of the illumination light. In this case, for example, during maintenance of the projector, it is possible to grasp the operating state until just before by operating the projector and reading the information stored in the storage unit, so it is possible to quickly respond to repairs, etc. Repair and other maintenance costs can be saved.

It is a block diagram explaining the structure of the projector of embodiment. 2 is a flowchart for explaining the operation of the projector in FIG. 1. It is a figure explaining the example of a display which requests | requires lamp replacement. It is a figure explaining the modification of arrangement | positioning of an optical sensor.

  Hereinafter, the structure and operation of a projector according to an embodiment of the invention will be described with reference to the drawings.

  As shown in FIG. 1, the projector 10 of the present embodiment includes a main body optical device 11 that is also called an optical engine unit, a circuit device 17 that controls the operation of the entire device, and an exterior case 19 that covers the entire device. For convenience of explanation, the illustrated circuit device 17 is displayed outside the outer case 19, but is actually disposed in the vicinity of the main body optical device 11 and the like in the outer case 19.

  The main optical device 11 includes an illumination unit 20, a color separation light guide optical system 40, a light modulation unit 50, a cross dichroic prism 60, a projection lens 70, and a sensor device 80. Among these, the illumination unit 20, the color separation light guide optical system 40, the light modulation unit 50, the cross dichroic prism 60, and the projection lens 70 are substantially entirely housed in a light guide 11a having a light shielding property. In the main body optical device 11, the illumination unit 20 and the color separation light guide optical system 40 constitute an illumination device for illuminating the light modulation unit 50.

  First, the illumination unit 20 includes a light source lamp unit 21 and a uniformizing optical system 23. Among these, the light source lamp unit 21 includes a lamp portion 21a and a concave lens 21b as light sources. The lamp unit 21a includes a lamp body 22a such as a high-pressure mercury lamp, and a concave mirror 22b that collects light source light and emits the light forward. The concave lens 21b serves to change the light source light from the lamp unit 21a into a light beam substantially parallel to the system optical axis SA, that is, the illumination optical axis, but may be omitted if the concave mirror 22b is a parabolic mirror, for example. it can. The homogenizing optical system 23 arranged at the next stage of the light source lamp unit 21 includes first and second lens arrays 23a and 23b, a polarization conversion member 23f, and a superimposing lens 23h. The first and second lens arrays 23a and 23b are each composed of a plurality of element lenses arranged in a matrix. Among these, the luminous flux emitted from the light source lamp unit 21 is divided into a plurality of partial luminous fluxes by the element lenses constituting the first lens array 23a. Further, the partial lenses from the first lens array 23a are emitted at an appropriate divergence angle by the element lenses constituting the second lens array 23b. The polarization conversion member 23f is composed of a prism array of PBS or the like, converts the light source light emitted from the lens array 23b into only linearly polarized light in a specific direction, and supplies it to the next stage optical system. The superimposing lens 23h enables the superimposing illumination to the light valves 50a, 50b, and 50c for each color provided in the light modulation unit 50 by appropriately converging the illumination light passing through the polarization conversion member 23f as a whole. That is, the illumination light emitted from the illumination unit 20 uniformly illuminates the displayable areas of the light valves 50a, 50b, and 50c for each color through the color separation light guide optical system 40, as will be described later.

  The color separation light guide optical system 40 includes first and second dichroic mirrors 41a and 41b, reflection mirrors 42a, 42b, and 42c, and three field lenses 43a, 43b, and 43c, which are emitted from the illumination unit 20. The illumination light is separated into three colors of red (R), green (G), and blue (B), and each color light is guided to the next-stage light valves 50a, 50b, and 50c. More specifically, first, the first dichroic mirror 41a reflects the R illumination light LR out of the three RGB colors and transmits the G and B illumination lights LG and LB. The second dichroic mirror 41b reflects the G illumination light LG of the two colors GB and transmits the B illumination light LB. In this color separation light guide optical system 40, the illumination light LR reflected by the first dichroic mirror 41a is reflected by traveling substantially along the system optical axis SA along the R-color optical path branched so as to be bent here. The light enters the field lens 43a for adjusting the incident angle through the mirror 42a. Further, the illumination light LG transmitted through the first dichroic mirror 41a and reflected by the second dichroic mirror 41b travels substantially along the system optical axis SA along a G-color optical path branched so as to be bent. The light enters the field lens 43b for adjusting the incident angle. Furthermore, the illumination light LB that has passed through the second dichroic mirror 41b travels along the B-color optical path branched so as to travel straight along the system optical axis SA, whereby the relay lenses 44a and 44b and the reflection mirror 42b. , 42c and then enters the incident angle adjusting field lens 43c.

  In the light modulation unit 50, each light valve 50a, 50b, 50c individually modulates the spatial intensity distribution of the incident illumination light as a non-light-emitting light modulation device. These light valves 50a, 50b, and 50c are liquid crystal panels 51a, 51b, and 51c that are illuminated in correspondence with the respective color lights emitted from the color separation light guide optical system 40, and the liquid crystal panels 51a, 51b, and 51c. Incident-side polarizing filters 52a, 52b, and 52c arranged on the incident side, and outgoing-side polarizing filters 53a, 53b, and 53c arranged on the outgoing side of the liquid crystal panels 51a, 51b, and 51c, respectively. Each liquid crystal panel 51a, 51b, 51c changes the spatial distribution of its polarization direction with respect to the illumination light LR, LG, LB incident through the incident side polarizing filters 52a, 52b, 52c. That is, the illumination lights LR, LG, and LB of the respective colors incident on the liquid crystal panels 51a, 51b, and 51c, respectively, according to the drive signals or control signals input as electrical signals to the liquid crystal panels 51a, 51b, and 51c, The polarization state is adjusted in units of pixels, and spatial intensity modulation is performed in units of pixels as the light passes through the output side polarization filters 53a, 53b, and 53c.

  The cross dichroic prism 60 is a light combining optical system for combining color images, and includes a first dichroic film 61 that is a dielectric multilayer film that reflects R light and a dielectric multilayer that reflects B light. A second dichroic film 62, which is a film, is arranged in an X shape in plan view. The cross dichroic prism 60 reflects the red light LR from the light valve 50a disposed on the R color optical path and substantially perpendicular to the system optical axis SA by the first dichroic film 61 and emits it to the right in the traveling direction. . Further, the cross dichroic prism 60 linearly emits the green light LG from the light valve 50b disposed on the G color optical path and substantially perpendicular to the system optical axis SA via both dichroic films 61 and 62. . Further, the cross dichroic prism 60 reflects the blue light LB from the light valve 50c disposed on the optical path for the B color and substantially perpendicular to the system optical axis SA by the second dichroic film 62 and emits it to the left in the traveling direction. Let

  The projection lens 70 is a projection optical system, and magnifies the image light by the combined light formed through the cross dichroic prism 60 at a desired magnification, and projects a color still image or moving image on a screen described later.

  The sensor device 80 includes a plurality of optical sensors 81, 82, 83, 84, 85. Of these, the first light sensor 81 is disposed in the light guide 11 a and behind the concave mirror 22 b of the light source lamp unit 21. The first optical sensor 81 detects the luminance of the illumination light emitted from the lamp unit 21a as leakage light partially passing through the concave mirror 22b. In the present embodiment, for example, minute leakage light in the entire visible light range is detected by the first optical sensor 81, but the light beam passing through the concave mirror 22b includes infrared light and the like. The brightness of the illumination light can also be detected indirectly by detection. The second optical sensor 82 is disposed to face the side surface of the polarization conversion member 23f of the homogenizing optical system 23 so as to be embedded in the light guide 11a. The second optical sensor 82 detects the luminance of the illumination light emitted from the homogenizing optical system 23 as leakage light emitted to the side of the polarization conversion member 23f. In the present embodiment, for example, leakage light in the entire visible light range is detected by the second optical sensor 82. The third light sensor 83 is disposed behind the reflection mirror 42a provided in the color separation light guide optical system 40 so as to be embedded in the light guide 11a. The third light sensor 83 detects particularly the luminance of the red light LR out of the illumination light emitted from the light source lamp unit 21 as leakage light passing through the reflection mirror 42a. The fourth optical sensor 84 is disposed in the light guide 11a, for example, in the vicinity of the field lens 43b. The fourth optical sensor 84 detects, in particular, the luminance of the green light LG among the illumination light emitted from the light source lamp unit 21 as leakage light passing through the periphery of the field lens 43b. The fifth optical sensor 85 is disposed behind the reflection mirror 42b provided in the color separation light guide optical system 40 so as to be embedded in the light guide 11a. The fifth optical sensor 85 detects, in particular, the luminance of the blue light LB among the illumination light emitted from the light source lamp unit 21 as leakage light that passes through the reflection mirror 42b.

  The circuit device 17 includes an image processing unit 91 to which an external image signal such as a video signal is input, a panel driving unit 92 that drives each liquid crystal panel 51a, 51b, 51c based on the output of the image processing unit 91, and a sensor device. The sensor drive unit 94 that operates 80 to receive the detection output, the lamp drive unit 96 that supplies power to the light source lamp unit 21 to adjust the operation state, the speaker 97 that outputs audio information, and the circuit portions 91 and 92. , 94, 96, etc., and a key operation unit 99 for user operation.

  In the circuit device 17, the image processing unit 91 includes a correction unit 91 a that appropriately corrects the input external image signal, and image information such as character information instead of or superimposed on the projection image corresponding to the external image signal. And an OSDC unit 91b for displaying. The former correction unit 91a performs various image processing such as color correction and distortion correction on the external image signal based on a command from the control unit 98. Specifically, when the brightness of a specific color among the illumination lights LR, LG, and LB emitted from the illumination unit 20 is decreased, image processing, that is, color correction is performed so as to maintain the color balance by compensating for the decrease in brightness of the specific color. Done. In addition, when the input external image signal relates to a movie or the like, for example, image processing is performed so as to set a display mode in which color is emphasized, or the input external image signal relates to digital data from a personal computer or the like In such a case, image processing is performed so that, for example, the display mode is focused on brightness. The latter OSDC unit 91b is for displaying various data relating to the operating state of the projector 10 on the screen as image information based on a command from the control unit 98. That is, the OSDC unit 91b causes the liquid crystal panels 51a, 51b, and 51c to perform light modulation corresponding to various information including characters, figures, and the like that are not directly related to the external image signal via the panel driving unit 92. Since the image obtained by such light modulation is enlarged and projected on the screen via the projection lens 70, various image information including warnings, guidance, and the like can be presented to the user.

  The panel drive unit 92 generates a drive signal for adjusting the transmission state of each light valve 50a, 50b, 50c based on the image signal after image processing output from the image processing unit 91. Accordingly, an image as a transmittance distribution can be formed in the light valves 50a, 50b, and 50c corresponding to the input external image signal.

  The sensor driving unit 94 operates the first, second, third, fourth, and fifth optical sensors 81, 82, 83, 84, and 85 that constitute the sensor device 80, respectively, to detect the outputs S1, S2, and S3. , S4, S5 are received. Among these, the detection outputs S1 and S2 are indirectly detected values of the luminance of the illumination light before being emitted from the illumination unit 20 and branched to the optical paths for each color. When the decrease of the detection outputs S1 and S2 with respect to the initial value exceeds a predetermined threshold value, the lamp unit 21a has reached a usable limit. Note that short-term fluctuations in the detection outputs S1 and S2 mean that the luminance of the illumination light flickers, that is, the operation of the lamp unit 21a becomes unstable. Further, the unbalanced decrease in the detection outputs S3, S4, S5 means a luminance difference between the illumination lights LR, LG, LB of each color, that is, a change in the color balance of the illumination light.

  The lamp driving unit 96 can adjust the voltage, current, driving frequency, and the like supplied to the light source lamp unit 21. The lamp drive unit 96 can change the operation parameter, for example, between lighting and steady state. In addition, the lamp driving unit 96 can increase or decrease the luminance of the illumination light emitted from the light source lamp unit 21 by adjusting the driving voltage, the driving frequency, or the like in a steady state, or can be emitted from the light source lamp unit 21. The flickering of the illumination light to be made can be reduced.

  The speaker 97 outputs audio information corresponding to the audio signal output from the control unit 98. The audio information includes not only a warning sound but also audio guidance. The information content notified by the warning sound or the voice guidance includes, for example, the brightness status of the lamp unit 21a and information that prompts replacement of the lamp unit 21a.

  The control unit 98 includes a microcomputer or the like, and operates based on a program that is appropriately prepared for controlling the image processing unit 91, the sensor driving unit 94, the lamp driving unit 96, and the like. The control unit 98 includes a storage unit 98a for storing various information necessary for control.

  Hereinafter, a control example of the operation of the projector 10 will be described with reference to the flowchart of FIG.

  First, the control unit 98 causes the lamp driving unit 96 to start an activation operation (step S11). The starting operation means a power feeding operation to the lamp unit 21a within a predetermined period from the start of lighting. By gradually increasing the power to be supplied to the lamp body 22a of the lamp unit 21a, the emission luminance of the lamp body 22a is gradually increased. Increase to. At this time, by adjusting the increase rate of the pulsed voltage value and current value applied to the lamp body 22a, the driving frequency, etc., the lamp body 22a can be quickly shifted to the high-luminance emission state without deteriorating. .

  Next, the control unit 98 switches the operation of the lamp driving unit 96 to start a steady operation (step S12). The steady operation means a power feeding operation to the lamp part 21a that has reached a sufficient light emission state by heating or the like, and the lamp body 22a is kept at an appropriate value by maintaining the power to be supplied to the lamp body 22a of the lamp part 21a. Maintain stable and high-luminance emission. At this time, the lamp body 22a can be maintained in a stable high-luminance emission state by appropriately increasing or decreasing the pulsed voltage value and current value applied to the lamp body 22a, the driving frequency, and the like.

  Next, the control unit 98 operates the image processing unit 91 to perform image display processing (step S13). Specifically, external image signal capture, external image signal correction processing, and information display processing for displaying character information and the like are appropriately combined. The image signal obtained by the processing in the image processing unit 91 in this way is output to the panel drive unit 92. Accordingly, the liquid crystal panels 51a, 51b, and 51c can be caused to perform light modulation corresponding to various image information including the projection image corresponding to the external image signal or the character information. The images formed on the liquid crystal panels 51a, 51b, 51c by such light modulation are enlarged and projected on the screen via the projection lens 70.

  Next, the control unit 98 checks the detection status of the first and second photosensors 81 and 82 in the sensor device 80, that is, the luminance level of the illumination light via the sensor driving unit 94 (step S14). Then, the control unit 98 determines whether or not the decrease of the detection outputs S1 and S2 of the two light sensors 81 and 82 with respect to the initial value is less than a predetermined threshold, that is, the decrease in the luminance of the illumination light is within the allowable limit range. It is determined whether or not there is (step S15). Note that the initial values of the detection outputs S1 and S2 and the threshold value for lowering the brightness are stored from the beginning in the storage unit 98a of the control unit 98, and the detection outputs S1 and S2 themselves are updated in the storage unit 98a of the control unit 98 as needed. Being stored. Information such as the detection outputs S1 and S2 is used as maintenance information when the manufacturer repairs and manages the information. That is, when performing maintenance, the state immediately before the failure can be saved simply by reading the information stored in the storage unit 98a of the control unit 98 by operating the projector 10 without the trouble of measuring the projector 10 brought in with a dedicated machine. This makes it possible to quickly understand the situation and reduce repair costs. Furthermore, by accumulating data such as the detection outputs S1, S2 as needed, it is possible to grasp the operation status of the product over a long period of time. By grasping such an operating state, information can be reflected in the design of a projector to be developed in the future, the customer service method, and the like.

  When the decrease in the detection outputs S1 and S2 exceeds a predetermined threshold, it is handled that the decrease in the luminance of the illumination light exceeds the allowable limit. In this case, assuming that the lamp unit 21a has reached the end of its useful life, the control unit 98 sends a warning image requesting lamp replacement to each liquid crystal panel via the image processing unit 91 and the panel driving unit 92. It is displayed on 51a, 51b, 51c (step S16). Specifically, as shown in FIG. 3, for example, as a warning requesting lamp replacement, subtitle-shaped image information WI can be included in the projection image PI projected on the screen SC. Further, the control unit 98 outputs a warning sound such as a guidance requesting lamp replacement from the speaker 97 (step S17).

  On the other hand, when the decrease in the detection outputs S1 and S2 is equal to or less than the predetermined threshold value, the control unit 98 determines that the deterioration of the lamp unit 21a has not progressed, and the control unit 98 includes the third sensor device 80 via the sensor driving unit 94. The detection status of the? 5 optical sensors 83 to 85 is checked (step S18). Then, the control unit 98 determines whether or not the variation among the detection outputs S3 to S5 of the optical sensors 83 to 85 is less than a predetermined threshold, that is, the amount of change in the color balance of the illumination light is within the allowable limit. It is judged whether it is (step S21). Note that the amount of change in the color balance of the illumination light is updated and stored in the storage unit 98a of the control unit 98 as needed. The amount of change in the color balance of the illumination light is used as maintenance information when the manufacturer repairs or manages it.

  When the variation among the detection outputs S3 to S5 exceeds a predetermined threshold value, it is handled as a characteristic in which the color balance of the illumination light is broken due to a change in characteristics of the lamp portion 21a and the like. In this case, adjustment of the projection state that restores the color balance, that is, color correction is performed (step S22). In other words, the control unit 98 causes the image processing unit 91 to perform image processing as color correction that compensates for the loss of color balance of the illumination light based on the variation among the detection outputs S3 to S5. The panel drive unit 92 operates each of the liquid crystal panels 51a, 51b, 51c with the drive signal after color correction as described above. As a result, an image with an appropriate color balance can be projected on the screen.

  On the other hand, when the variation among the detection outputs S3 to S5 is equal to or less than the predetermined threshold value, the control unit 98 assumes that the color balance of the illumination light is not lost, and the control unit 98 passes the first and second optical sensors via the sensor driving unit 94. Of the detection statuses 81 and 82, a short-term luminance increase / decrease of the illumination light is checked (step S23). Then, the control unit 98 determines whether or not the flickering degree, which is a short-term luminance increase / decrease in the detection outputs S1 and S2 of the two light sensors 81 and 82, is within the allowable limit range (step S24). Note that the flickering degree of the detection outputs S1 and S2 is stored in the storage unit 98a of the control unit 98 while being updated as needed. This flickering degree is used as maintenance information when a manufacturer repairs or manages the information.

  When the flickering degree of the detection outputs S1 and S2 exceeds a predetermined threshold value, it is treated that flickering exceeding the limit of illumination light occurs due to a change in the light emission state of the lamp unit 21a. In this case, the projection state is adjusted so as to eliminate flicker (step S25). That is, for example, the control unit 98 switches the operation of the lamp driving unit 96 from a standard one to one that is effective in suppressing flickering, and performs lighting driving of the lamp unit 21a that suppresses flickering. Specifically, by adjusting the pulsed voltage value and current value applied to the lamp body 22a, the driving frequency, etc., the lamp body 22a is lit in a stable state with little flicker even if the brightness is somewhat sacrificed. .

  When the flickering degree of the detection outputs S1 and S2 is equal to or less than a predetermined threshold value, if the power is not turned off (step S26), the process returns to step S14 to continue a series of checks, alarms, and the like (steps S14 to S14). S25).

  As apparent from the above description, in the projector 10 according to the present embodiment, the control unit 98 changes the state of the illumination light (specifically, the lamp body based on the outputs of the light sensors 81 to 85 that detect the illumination light). 22a), and adjusting the projection state of the image (specifically, correction of color balance, etc.), an alarm that directly reflects the state of the illumination light emitted from the illumination unit 20, It is possible to optimize the operation.

  In addition, this invention is not restricted to said embodiment, In the range which does not deviate from the summary, it can be implemented in a various aspect, For example, the following deformation | transformation is also possible.

  That is, in the above-described embodiment, the optical sensors 81 to 85 are arranged on the upstream side of the optical modulation unit 50, but the optical sensors 81 to 85 are arranged around the optical modulation unit 50 and on the downstream side of the optical modulation unit 50. It can also be arranged. For example, as shown in FIG. 4, an optical sensor 88 can be provided outside the optical path on the light emission side of the cross dichroic prism 60. In this case, the light beam SL from the light valves 50a, 50b, 50c deviated along the optical path is made incident on the optical sensor 88 by the mirror 89 fixed to the cross dichroic prism 60. Here, the optical sensor 88 can indirectly detect the intensity of illumination light as the intensity of image light for white display or the like, but the illumination of each color can be used as the color balance of image light for white display or the like. It is also possible to detect the intensity of light indirectly.

  In the above embodiment, the illumination light luminance drop, color balance deterioration, flicker, and the like are detected during steady operation. However, the illumination light luminance drop, color balance deterioration, flicker, etc. are monitored during start-up operation. The monitoring information can be stored in the storage unit 98a of the control unit 98 for maintenance.

  In the above-described embodiment, the main body optical device 11 includes the light source lamp unit 21, the uniformizing optical system 23, the color separation light guiding optical system 40, the light modulation unit 50, the cross dichroic prism 60, and the projection lens 70. Although described specifically as being, the present invention is not limited to this. For example, in the above embodiment, the transmissive liquid crystal panels 51a, 51b, 51c are used in the light modulation unit 50. However, the present invention can also be applied to a projector incorporating a reflective liquid crystal panel. Here, the “reflective type” means that the light valve reflects light. Further, in the above embodiment, the light modulation unit 50 is configured by the three light valves 50a, 50b, and 50c, but the present invention is also applicable to a projector incorporating one or more arbitrary light valves. Can do.

  In the main body optical device 11 of the above-described embodiment, the light modulation of each color is performed using the color separation light guide optical system 40, the light valves 50a, 50b, 50c, and the like. By using a combination of a color wheel illuminated by a micromirror and a device (light valve) that is composed of pixels of a micromirror and is irradiated with light transmitted through the color wheel, it is also possible to perform light modulation and synthesis of color. it can.

  Moreover, as a projector, there are a front projection type projector that projects an image from the direction of observing the projection surface and a rear projection type projector that projects an image from the side opposite to the direction of observing the projection surface. The configuration of the projector shown in 1 can be applied to any of them.

DESCRIPTION OF SYMBOLS 10 ... Projector, 11 ... Main body optical device, 17 ... Circuit apparatus, 19 ... Exterior case, 20 ... Illumination part, 21 ... Light source lamp unit, 21a ... Lamp part, 21b ... Concave lens, 23 ... Uniformation optical system, 23a, 23b ... lens array, 23f ... polarization conversion member, 23h ... superimposing lens, 40 ... color separation light guide optical system, 41a, 41b ... dichroic mirror, 50 ... light modulator, 50a, 50b, 50c ... light valve, 51a, 51b, 51c ... Liquid crystal panel, 53a, 53b, 53c ... Outgoing side polarization filter, 60 ... Cross dichroic prism, 70 ... Projection lens, 80 ... Sensor device, 81, 82, 83, 84, 85 ... Optical sensor, 91 ... Image processing section 92 ... Panel drive unit, 94 ... Sensor drive unit, 96 ... Lamp drive Parts, 97 ... speaker, 98 ... control unit, 98a ... storage unit, LR, LG, LB ... illumination light, SA ... system optical axis

Claims (7)

An illumination device that emits illumination light;
A light valve that modulates illumination light emitted from the illumination device according to image information to form an image;
A projection optical system for projecting an image formed by the light valve;
An optical sensor for detecting illumination light passing through a predetermined position on the optical path;
A projector comprising: a control unit that performs at least one of notifying an illumination light state change and adjusting an image projection state based on an output of the optical sensor.   The projector according to claim 1, wherein the control unit notifies a decrease in luminance of illumination light emitted from the illumination device.   The projector according to claim 2, wherein the control unit notifies that the deterioration of a lamp incorporated in the lighting device has exceeded a predetermined limit.   The projector according to any one of claims 2 and 3, wherein the control unit notifies a decrease in luminance of illumination light emitted from the illumination device as image information in a display image.   The projector according to any one of claims 2 and 3, wherein the control unit notifies a decrease in luminance of illumination light emitted from the illumination device as audio information.   6. The projector according to claim 1, wherein the control unit monitors at least one of luminance, color balance, and flicker of illumination light during a steady operation.   The projector according to any one of claims 1 to 6, wherein the control unit includes a storage unit that stores information regarding a change in state of illumination light.

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