JP2013061515A - Projector, projector system, and control method for projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector which can intelligibly notify a user of an operating state regardless of a change in an installation state.SOLUTION: A projector 1 comprises notification mode setting means 201 configured to set a body notification section 26, provided for a housing of the projector 1, to one of first and second notification modes different from each other in a notification state. Based on the first or second notification mode set by the notification mode setting means 201, control means 20 notifies a user of an operating state of the projector 1 by use of the body notification section 26.

Description

  The present invention relates to a projector, a projector system including a projector and a ceiling suspension device, and a projector control method.

  The projector is provided with a notification unit (hereinafter referred to as an LED) using an LED (Light Emitting Diode) or the like in the projector housing in order to notify the user of an operation state and an error state. When the projector is used on a desk and the user is nearby, the operation status of the projector can be visually confirmed by the LED, but when installing the projector on the ceiling, the distance from the user is increased, so the LED is small, When it was dark, the operating state was difficult to see. However, when the LED display is made large and bright, there is a problem that the LED display becomes an obstacle during projection when the user operates near the projector on a desk in a relatively dark room.

  Patent Document 1 discloses a remote control system that notifies a user by voice or vibration using a remote controller (remote controller) that performs two-way communication. According to such a remote control system, a projector capable of confirming an operation state has been proposed.

JP-A-11-262073

  However, when using a remote control system that performs two-way communication, there is a problem that the cost increases. In addition, a remote control is required every time to confirm the notification content, and when the remote control is not used, such as operating only with the main body key, the notification content cannot be easily confirmed. Furthermore, due to differences in installation conditions such as when used on a desk and when suspended from a ceiling, there is a problem that the operation becomes complicated such as registering the installation condition on the remote control side when changing the notification state.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example is a projector that projects and displays an image of the projector, and is provided in a housing of the projector, and a main body notification unit for notifying an operation state; A notification mode setting unit configured to set the notification unit to either the first notification mode or the second notification mode having a different notification state; and a control unit configured to control the operation of the projector. Based on either the first notification mode or the second notification mode set in the notification mode setting means, the operation state of the projector is notified by the main body notification unit.

  According to this application example, since the main body notification unit can be set to either the first notification mode or the second notification mode in which the notification state is different, for example, when installing in a ceiling-mounted installation or a bright room The user can select a notification mode according to the installation environment, such as a notification mode with high visibility for the user, a notification mode that does not interfere with the projection of the image when the projector is installed on a desk or installed in a dark room. It becomes possible to select. In this way, the notification content can be confirmed by a simple method without using a remote controller or the like.

  Application Example 2 In the projector according to the application example described above, the projector further includes an installation mode setting unit that sets the installation state of the projector to a ceiling installation mode or a normal installation mode, and the notification mode setting unit includes: The notification unit is set to either the first notification mode or the second notification mode based on the setting state by the installation mode setting means.

  According to this application example, the main body notification unit is set based on the ceiling-mounted installation mode in which the setting state by the installation mode setting means is suspended from a high place or the in-place installation mode used on a desk or the like. Since either the notification mode or the second notification mode is set, the notification mode can be set only by the user setting the installation mode.

  Application Example 3 In the projector according to the application example described above, the projector further includes an illuminance detection unit that detects brightness around the projector, and the notification mode setting unit is configured to perform the notification based on a detection result of the illuminance detection unit. The unit is set to either the first notification mode or the second notification mode.

  According to this application example, since the main body notification unit is set to either the first notification mode or the second notification mode based on the ambient illuminance detected by the illuminance detection unit, the brightness around the projector changes. Even in such a case, the user can easily set the notification mode without performing a special operation.

  Application Example 4 A projector system according to this application example is a projector system including a projector that projects an image and a ceiling suspension device that suspends and supports the projector. Control means for controlling the operation, the ceiling suspension device includes a ceiling suspension device notifying unit for notifying the operation state of the projector, and the control means indicates the operation state of the projector. It is characterized by alerting | reporting by.

  According to this application example, when the projector is suspended from the ceiling, the operating state of the projector is notified by the ceiling suspension device notification unit provided in the ceiling suspension device. However, the operating state of the projector can be easily grasped by the ceiling suspension device notification unit.

  Application Example 5 A projector control method according to this application example is a projector control method that is provided in a projector housing that projects an image and has a main body notification unit for notifying an operation state. A notification mode setting step for setting the unit to one of a first notification mode and a second notification mode with different notification states, and an operation state of the projector by the main body notification unit by the first notification mode or the second notification mode. A notification step of performing notification in any one of the notification modes.

  According to this application example, the notification state of the main body notification unit can be set to either the first notification mode or the second notification mode in which the notification state is different. The user selects a notification mode according to the installation environment, such as a notification mode with high visibility for the user when used in a remote control, and a notification mode that does not obstruct the eye when projecting an image when used in a dark room with upright installation. It becomes possible.

1 is a perspective view of a projector 1 according to a first embodiment. The figure which shows the installation state of a projector and a ceiling suspension apparatus alerting | reporting part. (A) is the perspective view of the installation state of a ceiling suspension apparatus, a ceiling suspension apparatus alerting | reporting part, and a projector, (b) is the perspective view which looked at the ceiling suspension apparatus alerting | reporting part 40 from the downward direction. 1 is a block diagram showing a schematic configuration of a projector. The figure which shows alerting | reporting mode setting corresponding to installation mode and the detection illumination intensity of the illumination intensity detection part 24. FIG. 6 is a flowchart showing the operation of the projector 1. The figure which shows the alerting | reporting state of the main body alerting | reporting part 26 corresponding to alerting | reporting mode. It is the elements on larger scale which show the alerting | reporting state of the main body alerting | reporting part 26 of the projector 1 of the modification 1, (a) shows 1st alerting | reporting mode, (b) shows the alerting | reporting state of the main body alerting | reporting part 26 in 2nd alerting | reporting mode. . It is the elements on larger scale which show the alerting | reporting state of the main body alerting | reporting part 26 of the projector 1 of the modification 2, (a) has the alerting | reporting part cover 3 in the position P1, (b) has the alerting | reporting part cover 3 in the position P2. The alerting | reporting state of the main body alerting | reporting part 26 is shown.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The following embodiments do not limit the invention according to the scope of claims, and all combinations of features in the embodiments are not necessarily essential to the solution means of the invention.

(First embodiment)
FIG. 1 is a perspective view of a projector 1 according to this embodiment.
As shown in FIG. 1, the projection lens 13 is exposed from the opening formed in the front surface 2 f of the housing 2 of the projector 1. An upper surface 2t of the housing 2 is provided with an input operation means 23 for operating the projector 1, an illuminance detection means 24 for detecting the illuminance around the projector 1, and a main body notification unit 26 composed of an LED, a buzzer, and the like. Yes. In this embodiment, the main body notification unit 26 includes three notification LEDs 261, 262, and 263.

FIGS. 2A and 2B are diagrams showing an installation state of the projector 1 and the ceiling suspension device 40 of the present embodiment.
As shown in FIG. 2A, in the projector 1, the casing 2 is supported by a ceiling suspension device 40, and the ceiling suspension device 40 is provided with a ceiling suspension device notification unit 41.
FIG. 2B is a diagram showing the ceiling suspension device notification unit 41. As shown in FIG. 2B, the ceiling suspension device notification unit 41 includes three ceiling suspension notification LEDs 411, 412, and 413 and a speaker 410. When the projector 1 is suspended from the ceiling device 40, the ceiling suspension notification unit 41 includes ceiling suspension notification LEDs 411, 412, 413 and the like so as to be easily visible from below.

FIG. 3 is a block diagram illustrating a schematic configuration of the projector 1 according to the present embodiment.
As shown in FIG. 3, the projector 1 includes an image projection unit 10, an OSD processing unit 15, an image signal processing unit 16, an image signal input unit 18, a control unit 20, a storage unit 21, an input operation unit 23, and an illuminance detection unit 24. , A light source control means 25, a main body notification section 26, an abnormality detection means 27, and the like, which are housed inside the casing 2 of the projector 1.
The ceiling suspension device 40 includes a ceiling suspension device notification unit 41 and the like, and the ceiling suspension device notification unit 41 is connected to the control unit 20 of the projector 1 via the connector 30.

  The image projection means 10 includes a light source 11, three liquid crystal light valves 12R, 12G, and 12B as light modulation devices, a projection lens 13 as a projection optical system, a liquid crystal drive means 14, and the like. The image projection means 10 modulates the light emitted from the light source 11 with the liquid crystal light valves 12R, 12G, and 12B and projects the light from the projection lens 13 to display an image on the screen SC or the like.

The light source 11 includes a discharge-type light source lamp 11a made of an ultra-high pressure mercury lamp, a metal halide lamp, or the like, and a reflector 11b that reflects light emitted from the light source lamp 11a toward the liquid crystal light valves 12R, 12G, and 12B. ing.
Light emitted from the light source 11 is converted into light having a substantially uniform luminance distribution by an integrator optical system (not shown), and red (R), green (G), and blue, which are the three primary colors of light, by a color separation optical system (not shown). After being separated into each color light component of (B), it enters the liquid crystal light valves 12R, 12G, and 12B, respectively.

The liquid crystal light valves 12R, 12G, and 12B are configured by a liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates. In the liquid crystal light valves 12R, 12G, and 12B, a plurality of pixels (not shown) arranged in a matrix are formed, and a driving voltage can be applied to the liquid crystal for each pixel.
When the liquid crystal driving unit 14 applies a driving voltage corresponding to the input image information to each pixel, each pixel is set to a light transmittance corresponding to the image information. Therefore, the light emitted from the light source 11 is modulated by passing through the liquid crystal light valves 12R, 12G, and 12B, and image light corresponding to image information is formed for each color light.
The formed image light of each color is synthesized for each pixel by a color synthesis optical system (not shown) to become color image light, and then enlarged and projected onto the screen SC or the like by the projection lens 13.

  In the above embodiment, the projector 1 that projects using the light source lamp 11a as the light source 11 is exemplified, but the present invention can also be applied to a projector that projects using an LED light source or a laser light source as the light source. In the above-described embodiment, the image projection unit 10 is exemplified by the transmissive liquid crystal type projection optical system using the light source 11 and the three liquid crystal light valves 12R, 12G, and 12B as the light modulation device. You may employ | adopt the light modulation apparatus of other display systems, such as a liquid crystal display system and a micromirror device system (light switch display system).

The control means 20 includes a CPU (Central Processing Unit), a RAM (Random Access Memory) used for temporary storage of various data, and the like, and operates according to a control program (not shown) stored in the storage means 21. As a result, the overall operation of the projector 1 is controlled. That is, the control unit 20 functions as a computer together with the storage unit 21.
Further, the control unit 20 includes a notification mode setting unit 201 and an installation mode setting unit 202.
The notification mode setting means 201 sets the main body notification unit 26 to either the first notification mode or the second notification mode in which the notification state is different.
The installation mode setting means 202 sets the installation state of the projector 1 to either a ceiling installation mode that is used by suspending the projector 1 from a high place or a regular installation mode that is used by installing on a desk.

  The storage means 21 is composed of a rewritable nonvolatile memory such as a flash memory or FeRAM (Ferroelectric RAM). The storage unit 21 stores a control program for controlling the operation of the projector 1, various setting data for defining operation conditions of the projector 1, and the like.

The input operation means 23 is for the projector 1 to accept an input operation from the user, and includes a plurality of operation keys for the user to give various instructions to the projector 1, and the housing 2 of the projector 1 main body. It consists of a main body key provided on the outer surface.
The operation keys provided in the input operation means 23 include a power key for alternately switching on / off the power supply, an input switching key for switching image input terminals input to the plurality of image signal input means 18, and various settings. There are a menu key that superimposes a setting menu for performing an operation, a cursor key that allows a user to select a setting item from the menu, an enter key, an escape key, and a screen mute key that interrupts projection.

When the user operates various operation keys of the input operation unit 23, the input operation unit 23 outputs an operation signal corresponding to the operation content of the user to the control unit 20.
The input operation means 23 may have a configuration including a remote controller (remote control) signal receiving means (not shown) and a remote controller (not shown) capable of remote operation. In this case, the remote controller emits an operation signal such as an infrared ray corresponding to the operation content of the user, and the remote control signal receiving means receives this and transmits it to the control means 20 as control information.

  The image signal input means 18 includes a plurality of image input terminals, and image information is input from each image input terminal from an external image output device such as a video reproduction device or a personal computer via a cable (not shown). .

  The image signal processing unit 16 converts the image information input from the image signal input unit 18 into image information representing the gradation of each pixel of the liquid crystal light valves 12R, 12G, and 12B. Here, the converted image information is for each color light of R, G, and B, and is composed of a plurality of pixel values corresponding to all the pixels of the liquid crystal light valves 12R, 12G, and 12B. The pixel value defines the light transmittance of the corresponding pixel, and the intensity (gradation) of light transmitted through each pixel and emitted is defined by this pixel value.

The OSD processing unit 15 performs processing for superimposing and displaying an OSD (on-screen display) image such as a menu image or a message image on the projection image based on an instruction from the control unit 20. The OSD processing unit 15 includes an OSD memory (not shown), and stores OSD image information representing graphics, fonts, and the like for forming an OSD image.
When the control unit 20 instructs to superimpose the OSD image, the OSD processing unit 15 reads out necessary OSD image information from the OSD memory, and outputs an image signal so that the OSD image is superimposed at a predetermined position on the projected image. The OSD image information is combined with the image information input from the processing means 16. The image information combined with the OSD image information is output to the liquid crystal driving means 14. When there is no instruction to superimpose the OSD image from the control unit 20, the OSD processing unit 15 outputs the image information input from the image signal processing unit 16 to the liquid crystal driving unit 14 as it is.

  When the liquid crystal driving unit 14 drives the liquid crystal light valves 12R, 12G, and 12B according to the image information input from the OSD processing unit 15, the liquid crystal light valves 12R, 12G, and 12B form images corresponding to the image information, and this image Is projected from the projection lens 13.

  The illuminance detection unit 24 includes an illuminance sensor and the like, detects the illuminance around the projector 1, and notifies the control unit 20.

  The light source control unit 25 controls the supply and stop of power to the light source 11 based on an instruction from the control unit 20, and switches between turning on and off the light source 11.

  The main body notification unit 26 includes an LED, a buzzer, and the like, and notifies the user of the operation state and abnormality occurrence state of the projector 1 according to instructions from the control unit 20. The lighting brightness of the LED of the main body notification unit 26 and the buzzer volume can be changed by an instruction from the control means 20.

  The abnormality detection unit 27 detects the occurrence of an abnormality in the projector 1 and notifies the control unit 20 of it.

  The ceiling suspension device notification unit 41 is configured by an LED, a buzzer, a speaker, or the like, and notifies the user of the operating state of the projector 1 and the abnormality occurrence state according to an instruction from the control means 20.

Next, the setting contents in the notification mode setting unit 201 corresponding to the installation state by the installation mode setting unit 202 and the detected ambient illuminance by the illuminance detection unit 24 of the projector 1 of the present embodiment will be described with reference to FIG. explain.
As shown in FIG. 4, when the installation mode setting unit 202 is set to the normal installation mode, the notification mode setting unit 201 is in the second notification mode if the detected illuminance of the illuminance detection unit 24 is equal to or greater than a predetermined illuminance L1. If the detected illuminance is less than L1, the notification mode setting means 201 is set to the first notification mode.
Moreover, when the installation mode setting means 202 is set to the ceiling installation mode, the notification mode setting means 201 is set to the first notification mode regardless of the detection result of the illuminance detection means 24.
The first notification mode and the second notification mode will be described later.

Next, the operation of the projector of this embodiment will be described using the flowchart of FIG.
First, the control unit 20 of the projector 1 detects a change in the operation state based on an input operation to the input operation unit 23, a detection result of the abnormality detection unit 27, and the like (step S101). The control unit 20 that has detected the change in the operation state acquires the setting state of the installation mode setting unit 202 (installation state of the projector 1) and the ambient brightness by the illuminance detection unit 24 (step S102), and transitions to step S103. To do.

  In step S103, the control unit 20 determines the notification mode setting unit based on the setting state of the installation mode setting unit 202 (installation state of the projector 1) acquired in step S102 and the ambient brightness detection result by the illuminance detection unit 24. Either the first notification mode or the second notification mode is set in 201, and the process proceeds to step S104 as a notification step. FIG. 6 shows the setting contents of the notification mode setting means 201 at this time. This step S103 corresponds to a notification mode setting step.

  In step S104, the control unit 20 notifies the operating state of the projector 1 by the main body notification unit 26 based on either the first notification mode or the second notification mode set in the notification mode setting unit 201, and the process proceeds to step S105. To do. At this time, the lighting brightness of the LED of the main body notification unit 26, the buzzer volume, and the like are changed according to the setting content of the notification mode setting means 201 (see FIG. 6).

  In step S105, the control means 20 checks whether or not the installation mode setting means 202 is set to the ceiling suspension installation mode and the ceiling suspension device 40 is connected. When the installation mode setting means 202 is set to the ceiling suspension installation mode and the ceiling suspension device 40 is connected (step S105: Y), the process proceeds to step S106. When the installation mode setting means 202 is set to the normal installation mode or the ceiling suspension device 40 is not connected (step S105: N), the process proceeds to step S107.

  In step S107, the operation flow ends.

Next, the notification state in each notification mode of the main body notification unit 26 will be described with reference to FIG.
The main body notification unit 26 has two modes, a first notification mode and a second notification mode, and notifies based on the setting contents of the notification mode setting means 201 shown in FIG. In the first notification mode, the LED lighting luminance of the main body notification unit 26 is bright and the buzzer volume is increased. In the second notification mode, the LED lighting brightness of the main body notification unit 26 is dark and the buzzer volume is small.

As described above, according to the projector 1 of the present embodiment, the main body notification unit 26 can be set to either the first notification mode or the second notification mode having a different notification state. Or a first notification mode that is highly visible to the user when used in an upright installation in a bright room, and a second notification mode that does not obstruct the image projection when used in an upright installation in a dark room. The user can select the notification mode according to the installation environment.
Further, since the main body notification unit 26 is set to either the first notification mode or the second notification mode based on the setting state by the installation mode setting unit 202, the main body notification unit can be set only by the user setting the installation mode. 26 notification modes can be set simultaneously.
In addition, since the main body notification unit 26 is set to either the first notification mode or the second notification mode based on the ambient detected illuminance by the illuminance detection means 24, the brightness of the projector 1 surroundings has changed. However, the notification mode can be set without the user performing a special operation.
Further, when the projector 1 is suspended from the ceiling, the ceiling suspension device notification unit 41 provided in the ceiling suspension device 40 notifies the operation state of the projector 1, so that it is difficult for the main body notification unit 26 of the projector 1 to visually recognize the projector 1. Even in the environment, the operating state of the projector 1 can be easily grasped by the ceiling suspension device notification unit 41.

Moreover, you may change the said embodiment as follows.
(Modification 1)
In the above-described embodiment, the main body notification unit 26 changes the lighting brightness of the three notification LEDs 261, 262, and 263 according to the setting of the notification mode setting unit 201. As in the configuration, each of the three notification LEDs 261, 262, 263 has a configuration in which a plurality of small LED groups are gathered, and the brightness of the LEDs of the main body notification unit 26 is changed depending on the lighting area depending on the number of lighting. Also good.

FIGS. 7A and 7B are partial enlarged views showing a notification state of the main body notification unit 26 of the present modification, where FIG. 7A is a first notification mode, and FIG. 7B is a second notification mode. The alerting | reporting state of the main body alerting | reporting part 26 is shown.
As shown in FIGS. 7A and 7B, each of the notification LEDs 261, 262, and 263 of the main body notification unit 26 includes four LED groups.
As shown in FIG. 7A, in the first notification mode, all four LEDs of the notification LEDs 261, 262, and 263 are lit.
As shown in FIG. 7B, in the second notification mode, only one of the four LEDs, 261a, 262a, and 263a, lights up in the notification LEDs 261, 262, and 263, respectively.
That is, in the second notification mode, the lighting areas of the notification LEDs 261, 262, and 263 become smaller and the brightness becomes darker than in the first notification mode.

  As described above, according to the projector 1 of this modification, the brightness of the LEDs can be changed depending on the number of the LED groups that constitute each LED of the main body notification unit 26, so that the brightness of the LEDs can be changed individually. This eliminates the need for a drive current changing circuit.

(Modification 2)
In the above-described embodiment, the main body notification unit 26 changes the lighting brightness of the three notification LEDs 261, 262, and 263 according to the setting of the notification mode setting unit 201. As described above, the notification unit cover 3 having an opening for transmitting the lighting light of the three notification LEDs 261, 262, and 263 is provided, and the size of the opening is changed by sliding the notification unit cover 3. May be. Then, the size of the opening changes, and the transmission area of the lighting light changes. The brightness of the LED of the main body notification unit 26 is changed according to the difference in the transmission area.
FIGS. 8A and 8B are partially enlarged views showing a notification state of the projector 1 according to this modification. As shown in FIGS. 8A and 8B, the notification unit cover 3 is installed on the main body notification unit 26 so as to be slidable between a position P1 and a position P2. The notification unit cover 3 is formed with notification unit cover openings 3a, 3b, and 3c for transmitting the lighting lights of the three notification LEDs 261, 262, and 263 of the main body notification unit 26. The shape is a combination of rectangles.
FIG. 8A is a partially enlarged view showing a notification state when the notification unit cover 3 is at the position P1. As shown in FIG. 8A, when the notification unit cover 3 is at the position P1, the large rectangular side openings of the notification unit cover openings 3a, 3b, 3c are three notification LEDs 261 of the main body notification unit 26. All the lighting areas 262 and 263 are exposed, and all the respective lighting lights are transmitted. The state where the notification unit cover 3 is at the position P1 corresponds to the first notification mode.
FIG. 8B is a partially enlarged view showing a notification state when the notification unit cover 3 is at the position P2. As shown in FIG. 8B, when the notification unit cover 3 is at the position P2, the notification unit cover openings 3a, 3b and 3c have three notification LEDs 261 and 262 of the main body notification unit 26 whose small rectangular side openings are provided. , 263 are partially exposed, and a part of each lighting light is transmitted. Therefore, in the state where the notification unit cover 3 is moved to the position P2, the light transmitted by the three LEDs of the main body notification unit 26 has a small transmission area and darkness. The state where the notification unit cover 3 is at the position P2 corresponds to the second notification mode.

  As described above, by moving the notification unit cover 3 to either the position P1 or the position P2, the area of the main body notification unit 26 that transmits the lighting light of each LED is changed, and the brightness of the LED is changed. Therefore, a drive current changing circuit for individually changing the luminance of the LED is not necessary. Moreover, it becomes possible to change to the notification mode desired by the user regardless of the installation state of the projector 1 and the ambient brightness.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Housing | casing, 3 ... Notification part cover, 3a, 3b, 3c ... Notification part cover opening part, 10 ... Image projection means, 11 ... Light source, 12R, 12G, 12B ... Liquid crystal light valve, 13 ... Projection Lens: 14 ... Liquid crystal drive means, 15 ... OSD processing means, 16 ... Image signal processing means, 18 ... Image signal input means, 15 ... Shutter position detection unit, 20 ... Control means, 21 ... Storage means, 23 ... Input operation means , 24 ... Illuminance detection means, 25 ... Light source control means, 26 ... Main body notification unit, 261, 262, 263 ... Notification LED, 27 ... Abnormality detection means, 30 ... Connector, 40 ... Ceiling suspension device, 41 ... Ceiling suspension device notification Part, 410 ... speaker, 411, 412, 413 ... ceiling-suspended notification LED.

Claims (5)

A projector that projects and displays an image,
A main body notification unit provided in a housing of the projector, for notifying an operation state of the projector;
A notification mode setting means for setting the notification unit to either the first notification mode or the second notification mode with different notification states;
Control means for controlling the operation of the projector;
With
The control means notifies the operation state of the projector by the main body notification section based on either the first notification mode or the second notification mode set in the notification mode setting means. projector. The projector according to claim 1,
It further comprises an installation mode setting means for setting the installation state of the projector to either the ceiling installation mode or the normal installation mode,
The notification mode setting unit sets the notification unit to either the first notification mode or the second notification mode based on a setting state by the installation mode setting unit. The projector according to claim 1 or 2,
It further comprises illuminance detection means for detecting the brightness around the projector,
The notification mode setting unit sets the notification unit to either the first notification mode or the second notification mode based on a detection result of the illuminance detection unit. The projector according to any one of claims 1 to 3,
A ceiling suspension device for installing the projector on the ceiling;
A ceiling suspension device notification section provided on the ceiling suspension device;
Further comprising
The said control means alert | reports the operation state of the said projector by the said ceiling suspension apparatus alerting | reporting part. A projector control method provided in a housing of a projector that projects an image and having a main body notification unit for notifying an operation state,
A notification mode setting step for setting the main body notification unit to one of a first notification mode and a second notification mode with different notification states;
A notification step of notifying the operation state of the projector in the notification mode of either the first notification mode or the second notification mode by the main body notification unit;
A projector control method characterized by comprising:

Images