JP5035435B2 - Projection apparatus, projection control method, and program - Google Patents

Description

  The present invention relates to a projection apparatus using a high-pressure mercury lamp or the like as a light source, a projection control method, and a program.

  Conventional projectors with retractable projection lens barrels are equipped with a lens cover, and the power is turned on without operating the power switch, such as extending the projection lens barrel or turning on the light source lamp in response to the opening operation of the lens cover. The thing which was made to perform the operation of was thought. (For example, Patent Document 1)

Japanese Unexamined Patent Publication No. 2003-029332

  The technique described in Patent Document 1 is based on the opening operation of the lens cover, and the power is turned on instead of turning on the power switch. Therefore, if this technology is further developed, when the retractable lens barrel has already been extended and the power is turned on, if the lens cover is closed by a certain angle within a range that does not interfere with the lens barrel, the power switch is turned on. Even without turning off the lens, it seems that the lens barrel is retracted, the light source lamp is turned off, etc. as needed.

  In fact, it is not a projector device, but with the same technology, a lens barrel or pop-up type can be automatically operated without operating the power switch by operating a certain amount of members called lens covers and lens barriers. Many compact cameras using a silver salt film, digital still cameras, etc. that automatically retract and retract the strobe part of the camera and turn off the power are commercialized.

  However, since the projector device uses a light source lamp that has high brightness at a very high temperature, such as a high-pressure mercury lamp, once the power to the light source lamp is cut off, the necessary illuminance can be obtained again by re-lighting. Not only is there a problem that it takes time to become, but if the energization is repeatedly turned on and off frequently, the expensive light source lamp will deteriorate and its life will be exhausted quickly, resulting in a great economic burden on the user. It is never a positive factor to turn on / off the power supply to the light source lamp without darkness.

  On the other hand, for example, it is generally performed by connecting a personal computer installed with software for presentation and this type of projector device, and during such a presentation, projection display is temporarily performed in the middle. However, there is also a demand to avoid switching the energized state of the light source lamp as frequently as possible as described above, and the content of the presentation is significantly limited.

The present invention has been made in view of the circumstances described above, and an object, even when the temporarily stopped freely projected and displayed in the middle of projecting shadow operation, low power consumption, It is an object of the present invention to provide a projection apparatus, a projection control method, and a program that can be operated more safely .

The invention according to claim 1 is a projection device,
A projection means including an optical lens that forms and emits an optical image using light from the light source lamp, and a reflective or transmissive spatial light modulator ;
A lens cover which is attached to the light image emission position of the projection means so as to be freely opened and closed, and shields the emission of the light image in a closed state;
Detecting means for detecting the open / closed state of the lens cover;
A gradation control means for reducing a gradation value of an image of the spatial light modulation element when the closed state of the lens cover is detected by the detection means;
When the closed state of the lens cover is detected by the detecting means, the gradation control means reduces the gradation value of the image of the spatial light modulation element, and the predetermined value is obtained without opening the lens cover. A determination means for determining whether time has elapsed,
When the determination means determines that a predetermined time has elapsed without lowering the gradation value of the image of the spatial light modulator , the power supply is turned off. Means.

Invention 請 Motomeko 2 wherein, in the invention according to the first aspect,
The gradation control means reduces the gradation value of the image of the spatial light modulator by bit-shifting the gradation value of the image.
The invention according to claim 3 is the invention according to claim 1 or 2, wherein
A light emission control means for reducing the light emission luminance of the light source lamp when the detection means detects the closed state of the lens cover;
The determination means is configured to detect the closed state of the lens cover by the detection means and reduce the light emission luminance of the light source lamp by the light emission control means for a predetermined time without opening the lens cover. Determine if it has passed,
The power-off means turns off the power when the determination means determines that a predetermined time has passed without the lens cover being opened after the light emission luminance of the light source lamp is lowered. It is a characteristic.
The invention according to claim 4 is the invention according to claim 3 , wherein
When it is determined by the determination means that the lens cover has been opened before a predetermined time has elapsed since the light emission brightness of the light source lamp has been reduced,
The light emission control means returns the light emission luminance of the light source lamp to a rated state.
The invention according to claim 5 is the invention according to claim 3 or 4,
A cooling fan that blows and cools the light source lamp;
The rotation speed of the cooling fan when the detection means detects the closed state of the lens cover.
Cooling control means to reduce the degree of
Is further provided.
According to a sixth aspect of the present invention, in the above claim 5 Symbol mounting,
When it is determined by the determination means that the lens cover has been opened before a predetermined time has elapsed since the light emission brightness of the light source lamp has been reduced,
The cooling control means returns the rotational speed of the cooling fan to a rated state.
The invention according to claim 7 is the invention according to any one of claims 1 to 6,
When it is determined by the determination means that the lens cover is in an open state before a predetermined time has elapsed since the gradation value of the image of the spatial light modulator is reduced,
The gradation control means returns the gradation value of the image of the spatial light modulator to a normal gradation value.
The invention according to claim 8 is a projection device,
A projection means including an optical lens that forms and emits an optical image using light from the light source lamp, and a reflective or transmissive spatial light modulator ;
A lens cover which is attached to the light image emission position of the projection means so as to be freely opened and closed, and shields the emission of the light image in a closed state;
Detecting means for detecting the open / closed state of the lens cover;
A light emission control means for reducing the light emission luminance of the light source lamp when the closed state of the lens cover is detected by the detection means;
Whether or not a predetermined time has passed without the lens cover being opened after the light emission control means has lowered the light emission luminance of the light source lamp when the detection means detects the closed state of the lens cover. A judging means for judging;
When it is determined by the determining means that a predetermined time has elapsed without lowering the light emission luminance of the light source lamp and the lens cover is not opened, a power-off means for turning off the power;
Gradation control means for reducing the gradation value of the image of the spatial light modulator when the detection means detects the closed state of the lens cover;
It is characterized by comprising .

The invention according to claim 9 is a projection control method,
A projection unit including an optical lens and a reflective or transmissive spatial light modulation element that forms and emits an optical image using light from a light source lamp, and can be opened and closed at a light image emission position of the projection unit A projection control method for a projection apparatus, comprising a lens cover that is attached to the lens cover and shields emission of a light image in a closed state,
A detection step of detecting an open / closed state of the lens cover;
A gradation control step for reducing the gradation value of the image of the spatial light modulation element when the closed state of the lens cover is detected in this detection step;
Whether or not a predetermined time has passed without the lens cover being opened after the light emission luminance of the light source lamp was reduced by the gradation control step when the closed state of the lens cover was detected by the detection step A judging process for judging
If it is determined by this determination step that a predetermined time has elapsed without lowering the gradation value of the image of the spatial light modulator, the lens cover is not opened. And a process.
The invention according to claim 10 is a projection control method,
A projection unit including an optical lens and a reflective or transmissive spatial light modulation element that forms and emits an optical image using light from a light source lamp, and can be opened and closed at a light image emission position of the projection unit A projection control method for a projection apparatus, comprising a lens cover that is attached to the lens cover and shields emission of a light image in a closed state,
A detection step of detecting an open / closed state of the lens cover;
A light emission control step of reducing the light emission luminance of the light source lamp when the closed state of the lens cover is detected in this detection step;
Whether or not a predetermined time has passed without the lens cover being opened after the light emission brightness of the light source lamp is reduced by the light emission control step when the closed state of the lens cover is detected by the detection step. A judging process for judging;
If it is determined that a predetermined time has elapsed without lowering the light emission luminance of the light source lamp and the lens cover is not opened by this determination step,
A gradation control step for reducing a gradation value of an image of the spatial light modulation element when the closed state of the lens cover is detected by the detection step;
It is characterized by having.

The invention according to claim 11
A projection unit including an optical lens and a reflective or transmissive spatial light modulation element that forms and emits an optical image using light from a light source lamp, and can be opened and closed at a light image emission position of the projection unit Is a program executed by a computer built in a projection apparatus including a lens cover that is attached to the lens cover and shields emission of a light image in a closed state,
A detecting step for detecting an open / closed state of the lens cover;
A gradation control step for reducing the gradation value of the image of the spatial light modulation element when the closed state of the lens cover is detected in this detection step;
Given without the lens cover, and thus reduce the tone value of the image of the spatial light modulation element by the tone control step when detecting a closed state of the lens cover is in the open state by said detecting step A determination step for determining whether time has elapsed;
If the determination step determines that a predetermined time has elapsed without lowering the gradation value of the image of the spatial light modulator, the lens cover is not opened. And causing the computer to execute the steps.
The invention according to claim 12
A projection unit including an optical lens and a reflective or transmissive spatial light modulation element that forms and emits an optical image using light from a light source lamp, and can be opened and closed at a light image emission position of the projection unit Is a program executed by a computer built in a projection apparatus including a lens cover that is attached to the lens cover and shields emission of a light image in a closed state,
A detecting step for detecting an open / closed state of the lens cover;
A light emission control step for reducing the light emission luminance of the light source lamp when the closed state of the lens cover is detected in this detection step;
By the detecting step whether a predetermined time has elapsed without the lens cover, and thus reduce the emission luminance of the light source lamp by the light emission control step when detecting a closed state of the lens cover is opened A judgment step to judge;
A power-off step for turning off the power when it is determined that a predetermined time has passed without the lens cover being opened after the light emission luminance of the light source lamp is lowered by the determination step;
When the closed state of the lens cover is detected by the detection step, the computer executes a gradation control step for reducing the gradation value of the image of the spatial light modulator.

According to the onset bright, even when the temporarily stopped freely projected and displayed in the middle of projecting operation, low power consumption, more safely can be operated projection apparatus, a projection control method and program Can provide.

1 is a perspective view showing an external configuration of a projector apparatus according to an embodiment of the present invention. The block diagram which shows the function structure of the electronic circuit of the projector apparatus which concerns on the same embodiment. The flowchart which shows the processing content of the drive control of the projection system which concerns on the same embodiment. The figure which shows the other structural example of the lens cover which concerns on the embodiment, and its detection switch.

  Hereinafter, an embodiment in which the present invention is applied to a projector apparatus will be described with reference to the drawings.

  FIG. 1 shows an external configuration of a projector apparatus 10 according to the embodiment. FIG. 1 (A) is mainly arranged on the front and top surfaces of the housing, and FIG. 1 (B) is arranged on the back and bottom surfaces of the housing. Indicates.

  As shown in FIG. 1 (A), a part of the front surface of the rectangular parallelepiped main body casing 11, the right side of the main body casing 11 is an upper open lens cover 12 that can be manually opened and closed as indicated by an arrow A. In addition to the projection lens 13 and the distance measuring sensor 14 being disposed inside, a lens cover switch 15 for detecting the lens cover 12 in a closed state is disposed at the contact position.

An Ir receiver 16 is disposed on the front and left end sides of the main casing 11.
The projection lens 13 is for projecting a light image formed by a spatial light modulation element such as a micromirror element, which will be described later, onto an object such as a screen. Here, a focus position and a zoom position (projection angle of view) Is arbitrarily variable.

  The distance measuring sensor 14 is arranged in directions orthogonal to each other so that one of the two pairs of phase difference sensors is in the horizontal direction and the other is in the vertical direction. The distance to the light / dark pattern is measured along a one-dimensional detection line.

  The Ir receiver 16 receives an infrared light (Ir) signal on which a key operation signal from a remote controller of the projector device 10 (not shown) is superimposed.

A switch unit 17 and a speaker 18 are disposed on the upper surface of the main body casing 11.
The switch unit 17 includes various key switches for instructing power on / off of the apparatus, input switching, automatic focusing, automatic keystone correction, and the like.

  The speaker 18 emits a sound of the input audio signal and a beep sound during operation.

As shown in FIG. 1B, an input / output connector portion 19, an Ir receiving portion 20, and an AC adapter connecting portion 21 are disposed on the back surface of the main casing 11.
The input / output connector unit 19 includes, for example, a USB terminal for connection with an external device such as a personal computer, a mini D-SUB terminal for video input, an S terminal, an RCA terminal, a stereo mini terminal for audio input, and the like. Become.

Similar to the Ir receiver 16, the Ir receiver 20 receives an infrared light (Ir) signal on which a key operation signal from a remote controller (not shown) is superimposed.
The AC adapter connection unit 21 connects a cable from an AC adapter (not shown) serving as a power source.

  Further, adjustment legs 22 a to 22 d capable of height adjustment are attached to the bottom surface of the main body casing 11 at the four corners. The lengths of the adjusting legs 22a, 22b, 22c, and 22d are adjusted by key operation on the keyboard unit 16.

  In the state of FIG. 1B, the pair of adjustment legs 22a and 22b located on the front side are adjusted slightly longer, and the pair of adjustment legs 22c and 22d located on the rear side are adjusted to the shortest state. Has been.

  Therefore, when the projector device 10 in this state is installed in a horizontal place, if the projection optical axis of the projection lens 13 is perpendicular to the mounting surface of the projection lens 13, the actual projection lens 13 The projection optical axis has a slight elevation angle and is emitted upward to a screen (not shown) to be projected.

  Therefore, if the screen to be projected is stretched in the vertical direction, the distance from the projection lens 13 increases as the screen approaches the upper end of the screen. Therefore, in the state where automatic keystone correction is not performed, a rectangular image is displayed. When projected, a trapezoidal image in which the upper base is longer than the lower base is projected and displayed on the screen.

  Next, the functional configuration of the electronic circuit of the projector apparatus 10 will be described with reference to FIG. In the figure, image signals of various standards input from the input / output connector unit 19 are unified into image signals of a predetermined format by the image conversion unit 32 via the input / output interface (I / F) 31 and the system bus SB. Later, it is sent to the projection encoder 33.

  The projection encoder 33 develops and stores the transmitted image signal in the video RAM 34, generates a video signal from the stored contents of the video RAM 34, and outputs the video signal to the projection drive unit 35.

  The projection driving unit 35 corresponds to the transmitted image signal as appropriate according to a frame rate, for example, 30 [frames / second] and the number of gradation displays, and a spatial light modulator ( SOM) 36 is driven to display, and a high-luminance white light emitted from a light source lamp 38 such as an ultra-high pressure mercury lamp disposed in a reflector 37 is passed through a color wheel 39 to the spatial light modulator 36. By appropriately coloring the primary color and irradiating it through the mirror 40, an optical image is formed by the reflected light, and projected and displayed on a screen (not shown) through the projection lens 13.

However, the projection lens 13 is driven by a lens motor (M) 41 to appropriately move the zoom position and the focus position.
The fan motor (M) 43 that rotates and drives the light source lamp 38 and the cooling fan 42 that cools the reflector 37 that forms the light source lamp 38 is both based on the supply voltage value from the light source drive unit 44. Works.

  The control unit 45 controls all the operations of the above circuits. The control unit 45 includes a CPU, a non-volatile memory that stores an operation program executed by the CPU including processing for temporarily stopping a projection operation, which will be described later, and a work memory.

  The control unit 45 is also connected to the lens cover switch 15, the leg driving unit 46, the sound processing unit 47, and the distance measurement processing unit 48 via the system bus SB.

  Under the control of the control unit 45, the leg drive unit 46 individually rotates and drives the motors (not shown) connected to the adjustment leg units 22a to 22d mounted on the lower surface of the main body casing 11, respectively. The posture of the main casing 11 is controlled by adjusting the leg lengths of the adjusting leg portions 22a to 22d.

The sound processing unit 47 includes a sound source circuit such as a PCM sound source, converts the sound data given during the projection operation into an analog signal, and drives the speaker 18 to emit a loud sound.
The distance measurement processing unit 48 drives the distance sensor 14 to measure the vertical and horizontal distances to the projection target.

  In addition, each key operation signal in the switch unit 17 is directly input to the control unit 45, and infrared light reception signals in the Ir reception unit 16 and the Ir reception unit 20 provided on the back side of the main body casing 11 are also controlled. Directly input to the unit 45.

Next, the operation of the above embodiment will be described.
3 mainly shows the control unit 45 and the control unit 45 in a state where an operation of projecting an image input from an external device (not shown) connected to the input / output connector unit 19 is performed. The control content including the light source system by the light source drive unit 44 operating under control is shown.

  During the initial normal operation, the light source drive unit 44 applies a rated voltage, for example, 200 [V] to the light source lamp 38 to drive light emission (step S01), and at the same time, a cooling fan 42 for cooling the light source lamp 38. A rated voltage, for example, 15 [V] is applied to the fan motor 43 that rotationally drives the fan motor 43 (step S02).

  At this time, the image displayed for projection by the spatial light modulator 36 is driven by gradation based on the normal gradation value as converted by the image conversion unit 32 for each RGB primary color component (step S03). ).

  Incidentally, when the spatial light modulation element 36 is composed of, for example, a micromirror element, each one-pixel mirror element forming the micromirror element displays only a binary image by one on / off operation. I can't.

  Therefore, by time-division driving, one frame of an image is divided into a plurality of fields, for example, if the number of gradation bits of the image signal of each primary color component is 4, and divided into 16 fields to control the number of times of on / off in time division. Thus, an image for one pixel of each primary color component can be displayed in gradation.

  While performing the normal projection operation as described above, it is determined whether or not the lens cover switch 15 is turned on, thereby waiting for the lens cover 12 to be closed (step S04).

  When the lens cover 12 is closed and the lens cover switch 15 is turned on, this is determined in step S04, and the projection operation is temporarily stopped. Specifically, the light source driving unit 44 applies a voltage 20% lower than the rated voltage to the light source lamp 38, for example, if the rated voltage is 200 [V], 160 [V] is applied to maintain the light emission driving ( In step S05), the fan motor 43 that rotationally drives the cooling fan 42 for cooling the light source lamp 38 is also reduced by 20 [%] from the rated voltage, for example, if the rated voltage is 15 [V]. [V] is applied to drive rotation (step S06).

  At this time, the image displayed for projection by the spatial light modulator 36 is a direction in which each pixel of the RGB primary color components is reduced by, for example, 1 bit from the normal gradation value as converted by the image conversion unit 32. The gradation value is substantially halved by driving the gradation based on the shifted value, and the number of times that the spatial light modulator 36 is turned off for gradation driving is increased by that amount, thereby projecting. It is assumed that the luminance of an image output for projection display from the lens 13 is halved (step S07).

  Whether or not a predetermined time (for example, 5 minutes) has passed in a state where the light emission luminance of the light image emitted from the projection lens 13 and the cooling capacity of the cooling fan 42 are intentionally reduced as described above ( In step S08), it is determined whether or not the lens cover switch 15 is turned off (step S09), thereby waiting for a predetermined time to elapse or for the lens cover 12 to be opened.

  If the predetermined time has elapsed, this is determined in step S08, and the power is turned off as it is in order to avoid unnecessary power consumption.

  When the lens cover 12 is opened and the lens cover switch 15 is turned off, this is determined in step S09, the process returns to the process from step S01, and the normal projection operation is started again.

  In this way, the lens cover switch 15 detects this only by closing the lens cover 12, and the light source lamp 38 is automatically driven to emit light at an applied voltage reduced from the rated value at a predetermined rate. Therefore, while the lens cover 12 is closed, the amount of heat generated by the light source lamp 38 is suppressed to some extent, and while the projection display as the projector device 10 is temporarily stopped, if the lens cover 12 is opened, the light source lamp 38 is restored. In addition, the light source lamp 38 can be easily turned on so as to emit light with the brightness of the light source, and the lighting drive itself of the light source lamp 38 is maintained, so that deterioration of the light source lamp 38 can be avoided.

  In addition, the rotation speed of the cooling fan 42 that cools the light source lamp 38 is also reduced as the light emission luminance of the light source lamp 38 is reduced, so that the projector apparatus 10 is in a state where the projection display is temporarily stopped. The noise generated by the cooling fan 42 as a main noise source can also be suppressed to a low level.

  Furthermore, the display drive is performed so as to lower the display gradation in order to temporarily reduce the luminance of the light image formed by the spatial light modulator 36 in conjunction with the decrease in the light emission luminance of the light source lamp 38. The absolute value of the amount of light applied to the back surface of the lens cover 12 while the lens cover 12 is closed can be greatly reduced, and the lens cover 12 can be reliably prevented from becoming hot.

  In this case, as a specific process for lowering the display gradation of the spatial light modulator 36, it is formed by a very simple process for shifting the digital value of the gradation of the image signal in the direction of decreasing by 1 bit or 2 bits. The luminance of the optical image can be set to approximately 1/2 or approximately 1/4.

  In addition, you may abbreviate | omit the operation | movement which reduces the drive voltage of a lamp | ramp and a fan in said step S05 and step S06. In that case, even with only the process of lowering the display gradation, a gray display is performed and the lighting drive of the light source lamp 38 itself is maintained, so that it is possible to avoid the deterioration. Conversely, step S07 may be omitted, and only the operation of lowering the lamp and fan drive voltages in steps S05 and S06 may be performed.

  As a simpler process for lowering the display gradation in the spatial light modulation element 36, a method of setting all gradation values to “0 (zero)”, that is, in a state where the lens cover 12 is closed. The spatial light modulator 36 may perform only display in which the entire screen is black.

  In this case, since the light from the light source lamp 38 is totally reflected by the spatial light modulator 36 at a place other than the optical path reaching the projection lens 13, the amount of light applied to the back surface of the light emitting lens cover 12 is “0 (zero)”. Therefore, it is possible to reliably avoid the lens cover 12 from becoming hot.

  It should be noted that the method of reducing the display gradation in the spatial light modulator 36 and the method of setting it to “0 (zero)” are the same even if they are implemented without reducing the light emission luminance on the light source lamp 38 side. In addition, when the lens cover 12 is opened again, it is possible to cope with excellent responsiveness so that the required light emission luminance can be obtained immediately. Generates heat in the same way as during normal projection, and therefore the rotational speed of the cooling fan 42 that cools it is not reduced.

  In the above-described embodiment, the case where the lens cover 12 is opened in the forward and downward direction of the projection lens 13 as shown by the arrow A in FIG. 1 has been described as an example. However, the present invention is not limited to this. The lens cover may be opened and closed by sliding.

  FIG. 4 shows an example of the configuration of the projector apparatus 10 comprising a main body casing 11 ′ having a slide type lens cover 12 ′. In this case, the projector apparatus 10 is turned on with the lens cover 12 ′ closed. It is assumed that a lens cover switch 15 'is disposed at the position.

  4A shows a state in which the lens cover 12 'is opened and the projection lens 13 and the distance measuring sensor 14 are exposed and can be projected, while FIG. 4B shows the projection lens 13 with the lens cover 12' closed. And the distance measuring sensor 14 is covered.

  As shown in FIG. 4B, when the lens cover switch 15 'is turned on while the lens cover 12' is slid and closed, this is detected and the same operation as in the above embodiment is performed.

  In the above-described method embodiment, a digital mirror element is used as the spatial light modulation element 36, an ultrahigh pressure mercury lamp is used as the light source lamp 38, and a cooling fan 42 for cooling the light source lamp 38 is also present. However, the present invention does not limit the elements of the individual members. For example, as the spatial light modulation element 36, a transmissive color liquid crystal panel is used instead of the digital mirror element, and the color wheel 39 and the mirror 40 are provided. A color light image may be formed by transmitting the light emitted from the light source lamp 38 without being arranged, and may be led out to the projection lens 13.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, at least one of the problems described in the column of the problem to be solved by the invention can be solved, and described in the column of the effect of the invention. In a case where at least one of the obtained effects can be obtained, a configuration in which this configuration requirement is deleted can be extracted as an invention.

  DESCRIPTION OF SYMBOLS 10 ... Projector apparatus 11, 11 '... Main body casing, 12, 12' ... Lens cover, 13 ... Projection lens, 14 ... Distance sensor, 15, 15 '... Lens cover switch, 16 ... Ir receiving part, 17 ... Switch , 18 ... Speaker, 19 ... Input / output connector, 20 ... Ir receiver, 21 ... AC adapter connection, 22a-22d ... Adjustment leg, 31 ... Input / output interface (I / F), 32 ... Image converter 33 ... Projection encoder, 34 ... Video RAM, 35 ... Projection drive unit, 36 ... Spatial light modulation element (SOM), 37 ... Reflector, 38 ... Light source lamp, 39 ... Color wheel, 40 ... Mirror, 41 ... Lens motor (M), 42 ... Fan, 43 ... Fan motor (M), 44 ... Light source drive unit, 45 ... Control unit, 46 ... Leg drive unit, 47 ... Audio processing unit, 48 ... Distance measurement process Section, SB ... system bus.

Claims (12)

A projection means including an optical lens that forms and emits an optical image using light from the light source lamp, and a reflective or transmissive spatial light modulator;
A lens cover which is attached to the light image emission position of the projection means so as to be freely opened and closed, and shields the emission of the light image in a closed state;
Detecting means for detecting the open / closed state of the lens cover;
A gradation control means for reducing a gradation value of an image of the spatial light modulation element when the closed state of the lens cover is detected by the detection means;
When the closed state of the lens cover is detected by the detecting means, the gradation control means reduces the gradation value of the image of the spatial light modulation element, and the predetermined value is obtained without opening the lens cover. A determination means for determining whether time has elapsed,
When the determination means determines that a predetermined time has elapsed without lowering the gradation value of the image of the spatial light modulator, the power supply is turned off. A projection apparatus.   2. The projection apparatus according to claim 1, wherein the gradation control means reduces the gradation value of the image of the spatial light modulator by bit-shifting the gradation value of the image. A light emission control means for reducing the light emission luminance of the light source lamp when the detection means detects the closed state of the lens cover;
The determination means is configured to detect the closed state of the lens cover by the detection means and reduce the light emission luminance of the light source lamp by the light emission control means for a predetermined time without opening the lens cover. Determine if it has passed,
The power-off means turns off the power when the determination means determines that a predetermined time has passed without the lens cover being opened after the light emission luminance of the light source lamp is lowered. The projection apparatus according to claim 1, wherein the projection apparatus is characterized in that: When it is determined by the determination means that the lens cover has been opened before a predetermined time has elapsed since the light emission brightness of the light source lamp has been reduced,
4. The projection apparatus according to claim 3, wherein the light emission control means returns the light emission luminance of the light source lamp to a rated state. A cooling fan that blows and cools the light source lamp;
5. The projection apparatus according to claim 3, further comprising cooling control means for reducing a rotation speed of the cooling fan when the detection means detects the closed state of the lens cover. When it is determined by the determination means that the lens cover has been opened before a predetermined time has elapsed since the light emission brightness of the light source lamp has been reduced,
6. The projection apparatus according to claim 5, wherein the cooling control means returns the rotational speed of the cooling fan to a rated state. When it is determined by the determination means that the lens cover is in an open state before a predetermined time has elapsed since the gradation value of the image of the spatial light modulator is reduced,
The projection apparatus according to claim 1, wherein the gradation control unit returns the gradation value of the image of the spatial light modulation element to a normal gradation value. A projection means including an optical lens that forms and emits an optical image using light from the light source lamp, and a reflective or transmissive spatial light modulator;
A lens cover which is attached to the light image emission position of the projection means so as to be freely opened and closed, and shields the emission of the light image in a closed state;
Detecting means for detecting the open / closed state of the lens cover;
A light emission control means for reducing the light emission luminance of the light source lamp when the closed state of the lens cover is detected by the detection means;
Whether or not a predetermined time has passed without the lens cover being opened after the light emission control means has lowered the light emission luminance of the light source lamp when the detection means detects the closed state of the lens cover. A judging means for judging;
When it is determined by the determining means that a predetermined time has elapsed without lowering the light emission luminance of the light source lamp and the lens cover is not opened, a power-off means for turning off the power;
A projection apparatus comprising: gradation control means for reducing a gradation value of an image of the spatial light modulation element when the closed state of the lens cover is detected by the detection means. A projection unit including an optical lens and a reflective or transmissive spatial light modulation element that forms and emits an optical image using light from a light source lamp, and can be opened and closed at a light image emission position of the projection unit A projection control method for a projection apparatus, comprising a lens cover that is attached to the lens cover and shields emission of a light image in a closed state,
A detection step of detecting an open / closed state of the lens cover;
A gradation control step for reducing the gradation value of the image of the spatial light modulation element when the closed state of the lens cover is detected in this detection step;
When the closed state of the lens cover is detected by the detecting step, the gradation control step reduces the gradation value of the image of the spatial light modulator, and the predetermined value is obtained without opening the lens cover. A determination step for determining whether time has elapsed;
If it is determined by this determination step that a predetermined time has elapsed without lowering the gradation value of the image of the spatial light modulator, the lens cover is not opened. A projection control method comprising the steps of: A projection unit including an optical lens and a reflective or transmissive spatial light modulation element that forms and emits an optical image using light from a light source lamp, and can be opened and closed at a light image emission position of the projection unit A projection control method for a projection apparatus, comprising a lens cover that is attached to the lens cover and shields emission of a light image in a closed state,
A detection step of detecting an open / closed state of the lens cover;
A light emission control step of reducing the light emission luminance of the light source lamp when the closed state of the lens cover is detected in this detection step;
Whether or not a predetermined time has passed without the lens cover being opened after the light emission brightness of the light source lamp is reduced by the light emission control step when the closed state of the lens cover is detected by the detection step. A judging process for judging;
If it is determined that a predetermined time has elapsed without lowering the light emission luminance of the light source lamp and the lens cover is not opened by this determination step,
A projection control method comprising: a gradation control step of reducing a gradation value of an image of the spatial light modulation element when the closed state of the lens cover is detected by the detection step. A projection unit including an optical lens and a reflective or transmissive spatial light modulation element that forms and emits an optical image using light from a light source lamp, and can be opened and closed at a light image emission position of the projection unit Is a program executed by a computer built in a projection apparatus including a lens cover that is attached to the lens cover and shields emission of a light image in a closed state,
A detecting step for detecting an open / closed state of the lens cover;
A gradation control step for reducing the gradation value of the image of the spatial light modulation element when the closed state of the lens cover is detected in this detection step;
Given without the lens cover, and thus reduce the tone value of the image of the spatial light modulation element by the tone control step when detecting a closed state of the lens cover is in the open state by said detecting step A determination step for determining whether time has elapsed;
If the determination step determines that a predetermined time has elapsed without lowering the gradation value of the image of the spatial light modulator, the lens cover is not opened. A program that causes a computer to execute the steps. A projection unit including an optical lens and a reflective or transmissive spatial light modulation element that forms and emits an optical image using light from a light source lamp, and can be opened and closed at a light image emission position of the projection unit Is a program executed by a computer built in a projection apparatus including a lens cover that is attached to the lens cover and shields emission of a light image in a closed state,
A detecting step for detecting an open / closed state of the lens cover;
A light emission control step for reducing the light emission luminance of the light source lamp when the closed state of the lens cover is detected in this detection step;
By the detecting step whether a predetermined time has elapsed without the lens cover, and thus reduce the emission luminance of the light source lamp by the light emission control step when detecting a closed state of the lens cover is opened A judgment step to judge;
A power-off step for turning off the power when it is determined that a predetermined time has passed without the lens cover being opened after the light emission luminance of the light source lamp is lowered by the determination step;
A program that causes a computer to execute a gradation control step of reducing a gradation value of an image of the spatial light modulation element when the closed state of the lens cover is detected by the detection step.

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