JP2021085978A - Color wheel unit and image projection device - Google Patents

Abstract

To enable normal image projection even when tape for markers has peeled off during projection.SOLUTION: The color wheel unit comprises: a color wheel formed by arranging segments of prescribed colors in order along the direction of rotation; a rotor that rotates in synchronism with the color wheel and is provided coaxially with the rotation axis of the color wheel; and a marker for rotation position detection which is provided at one or a plurality of points of the rotor. The marker is provided in plurality at the same position of the rotor overlapping one on another. Thus, even when an upper marker peels off, a lower marker functions normally, making it possible to accurately detect the rotation position of the color wheel and perform image projection normally.SELECTED DRAWING: Figure 8

Description

The present invention relates to a color wheel unit and an image projection device.

Today, DLP (Digital Light Processing) projector devices are known. This DLP projector device irradiates the color wheel with the light emitted from the light source. The color wheel is formed by arranging several types of filters that transmit a specific wavelength along the circumferential direction of the disk. On the optical path of the light from the light source, the light transmitted through each filter of such a color wheel, which is rotationally driven at a high distance, is applied to the optical modulation element via a light tunnel. The light modulation element forms an image for projection based on the light transmitted through each filter of the color wheel. The image for projection is projected on a screen or the like via the projection optical system.

As the light modulation element, for example, a DMD (Digita1 Micromirror Device) is used. The DMD generates an image in synchronization with the rotation of the color wheel based on the image data input from an external device such as a personal computer device. That is, the DMD drives the image conversion element in synchronization with the rotation reference position signal obtained based on the rotation reference position of the color wheel, thereby generating an image while synchronizing the color modulation of the signal.

Further, the color light other than one color light emitted from the projection lens is detected by the color light detector, and the rotation timing of the color wheel or the color modulation is performed so that the output of this color light detector becomes the minimum or zero <0>. Projection projection devices that control synchronization timing are also known.

Patent Document 1 (Japanese Unexamined Patent Publication No. 2012-137558) discloses a color wheel unit that detects a rotation reference position of a color wheel with a marker tape. This color wheel unit detects the light reflected by the annular marker tape rotating together with the color wheel by a position sensor arranged so as to face the marker tape. As a result, the rotation reference position of the color wheel can be detected.

However, in the color wheel unit of Patent Document 1, a marker tape is glued to the color wheel motor. Therefore, when the marker tape is peeled off, there is a problem that normal image projection becomes difficult.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a color wheel unit and an image projection device capable of continuing normal image projection even if the marker tape is peeled off during projection. To do.

In order to solve the above-mentioned problems and achieve the object, the present invention provides a color wheel formed by arranging predetermined color segments in order along the rotation direction and coaxial with the rotation axis of the color wheel. A rotating body that rotates in synchronization with the color wheel and markers for detecting the rotation position provided at one or a plurality of positions of the rotating body are provided, and a plurality of markers are stacked at the same position of the rotating body. It is characterized in that it is provided.

According to the present invention, even if the marker tape is peeled off, a normal image projection can be performed.

FIG. 1 is a perspective view showing the appearance of the projector of the embodiment. FIG. 2 is a perspective view of the optical engine of the projector of the embodiment. FIG. 3 is a perspective view of the illumination optical system unit of the projector of the embodiment. FIG. 4 is a diagram for explaining a configuration of a color wheel unit provided in the projector of the embodiment. FIG. 5 is a hardware configuration diagram of the projector of the embodiment. FIG. 6 is a functional block diagram of the projector of the embodiment. FIG. 7 is a timing chart showing the timing of each part when the rotation of the color wheel is normally detected by the first marker provided on the rotating body of the color wheel. FIG. 8 is a perspective view showing a state in which the first marker attached to the color wheel is peeled off and the second marker is exposed. FIG. 9 is a timing chart for explaining the rotation detection pulse of the first marker and the rotation detection pulse of the second marker, which have different detection levels. FIG. 10 is a timing chart for explaining the rotation detection pulse of the first marker and the rotation detection pulse of the second marker, which have different pulse widths.

Hereinafter, the projector according to the embodiment of the color wheel unit and the image projection device will be described with reference to the attached drawings.

(Projector configuration)
FIG. 1 is a perspective view showing a projection state of the projector 1 of the embodiment. FIG. 2 is a perspective view of the optical engine of the projector 1 of the embodiment. FIG. 3 is a perspective view of the illumination optical system unit of the projector 1 of the embodiment.

First, as shown in FIG. 1, the projector 1, which is an example of the image projection device, has an exit window 3 and an external interface (external I / F) 9. Further, an optical engine for generating a projected image is provided inside the projector 1. In the projector 1, for example, an optical engine generates a projected image based on image data transmitted from a personal computer device (personal computer) or a digital camera connected to an external I / F9, and an exit window 3 is as shown in FIG. Projects an image onto the screen S from. The X1X2 direction shown in FIG. 1 indicates the width direction of the projector 1, the Y1Y2 direction indicates the depth direction of the projector 1, and the Z1Z2 direction indicates the height direction of the projector 1.

(Optical engine configuration)
As shown in FIG. 2, the optical engine 15 provided in the projector 1 of the embodiment includes a light source 30, an illumination optical system unit 40, an image display unit 50, and a projection optical system unit 60.

The light source 30 is provided on the side surface of the illumination optical system unit 40 and irradiates light in the X2 direction. The illumination optical system unit 40 guides the light emitted from the light source 30 to the image display unit 50 provided at the lower part. The image display unit 50 generates a projected image using the light guided by the illumination optical system unit 40. The projection optical system unit 60 is provided above the illumination optical system unit 40, and projects the projected image generated by the image display unit 50 to the outside of the projector 1.

The optical engine 15 according to the present embodiment is configured to project an image upward using the light emitted from the light source 30, but it may also be configured to project an image in another direction such as a horizontal direction. Good.

(Configuration of illumination optical system unit)
As shown in FIG. 3, the illumination optical system unit 40 provided in the projector 1 of the embodiment includes a color wheel unit 430 having a color wheel 401, a light tunnel 402, relay lenses 403, 404, and a cylinder mirror 405. It has a concave mirror 406.

The color wheel 401 is, for example, a disk in which filters of each color of R (red), G (green), and B (blue) are provided in different portions in the circumferential direction. The color wheel 401 is rotationally driven at high speed, and converts the light emitted from the light source 30 into light of each RGB color in a time division manner.

The light tunnel 402 is formed in a square tubular shape by, for example, laminating flat glass or the like. The light tunnel 402 multiple-reflects the light of each RGB color transmitted through the color wheel 401 on the inner surface to make the brightness distribution uniform and guide the light to the relay lenses 403 and 404. The relay lenses 403 and 404 collect the light emitted from the light tunnel 402 while correcting the axial chromatic aberration.

The cylinder mirror 405 and the concave mirror 406 reflect the light emitted from the relay lenses 403 and 404 to the DMD (Digita1 Micromirror Device) 551 provided in the image display unit 50. The DMD 551 modulates the reflected light from the concave mirror 406 to generate a projected image.

(Composition of color wheel unit)
FIG. 4 is a diagram for explaining the configuration of the color wheel unit 430. Of these, FIG. 4A is a right side view of the color wheel unit 430. FIG. 4B is a front view (viewed from the side where light is incident) of the color wheel unit 430. FIG. 4C is a perspective view of the color wheel unit 430 as viewed from diagonally above right.

As shown in FIGS. 4A to 4C, the color wheel unit 430 includes a color wheel 401, a rotating body 450, and a rotation detection sensor 400.

The color wheel 401 is composed of an RGB color filter colored based on glass of several colors having different wavelengths as a color dividing element of the projector 1. The color wheel 401 is rotationally driven at high speed by the motor 460. As a result, the light from the light source (reference numeral 301 in FIG. 5) sequentially passes through each of the RGB color filters.

The rotating shaft 461 of the motor 460 is provided with a cylindrical rotating body 450 that rotates together with a color wheel 401 composed of a color filter. That is, the rotating shaft 461, the rotating body 450, and the color wheel 401 of the motor 460 are provided so as to rotate around the same rotating shaft (coaxially). As an example, the motor 460 rotates and drives the color wheel 401 via the rotating body 450 at a rotation frequency of 120 Hz.

A first marker 700 is attached to a part of the outer peripheral surface of the rotating body 450 with an adhesive member. The first marker 700 is formed by applying a black treatment to a member based on an aluminum (AL) film. The rotating body 450 to which the first marker 700 is attached is made of an iron member and has a certain gloss. Specifically, the rotating body 450 is formed by plating the surface with zinc or by subjecting it to corrosion after electrolytic polishing.

Therefore, in the rotating body 450, the amount of light reflected is different between the portion to which the first marker 700 is attached and the portion to which the first marker 700 is not attached. That is, the portion to which the first marker 700 is attached absorbs light, and the portion to which the first marker 700 is not attached reflects light.

The rotation detection sensor 400 irradiates the rotating body 450 with light and receives the light reflected by the rotating body 450. Of the rotating body 450, the portion to which the first marker 700 is not attached is glossy, so that a large amount of light is reflected, and the amount of light received by the rotation detection sensor 400 increases. On the other hand, in the portion of the rotating body 450 to which the first marker 700 is attached, the amount of reflected light is small, and the amount of light received by the rotation detection sensor 400 is also small. The rotation detection sensor 400 detects the position of the first marker 700 based on such a difference in the amount of received light.

(Structure of second marker)
Here, in the case of the projector 1 of this embodiment, the second marker 750 (see FIG. 8) is provided in the portion covered by the first marker 700 of the rotating body 450 to be attached. The second marker 750 is provided at the same position as the first marker 700, and is processed into a black color that absorbs light. Since the second marker 750 is covered with the first marker 700, it is desirable that the thickness is as small as possible. Further, as will be described later, the second marker 750 functions when the first marker 700 is peeled off. Therefore, the second marker 750 is formed by cutting the surface of the rotating body 450 by, for example, laser marking processing so as not to peel off together with the first marker 700.

Further, the second marker 750 is formed in black or the like different from the first marker 700 so as to have a detection level different from that of the first marker 700 by such laser marking processing. As a result, even if the first marker 700 is peeled off, the second marker 750 functions, so that a normal projection operation can be performed.

The size of the second marker 750 may be the same as that of the first marker 700, or may be one size smaller. Further, by matching the color start position of the color filter with the color start position of the color filter as an end positioning reference when the first marker 700 is attached and forming the first marker 700 on the rotating body 450, the position accuracy of the attachment position of the first marker 700 is accurate. Can be improved. The first marker and the second marker are examples of markers.

(Hardware configuration)
FIG. 5 is a hardware configuration diagram of the projector 1. As shown in FIG. 5, the projector 1 has a control unit 10 and an optical engine 15.

(Control unit configuration)
The control unit 10 has a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, an SDRAM (Synchronous Dynamic Random Access Memory) 103, and an NVRAM (Non Volatile Random Access Memory). Further, the control unit 10 includes a fan 105, an operation unit 106, a remote controller receiving unit (remote control receiving unit) 107, an external I / F 108, a network I / F 109, a media I / F 110, and a power supply unit 4. Each of these units 101 to 110 and the power supply unit 4 are connected to each other via a bus line 111.

The CPU 101 controls the operation of the entire projector 1. Various programs executed by the CPU 101 are stored in the ROM 102. For example, the rotation control program of the color wheel 401 is stored in the ROM 102. By executing this rotation control program, the CPU 101 realizes each function described later with reference to FIG. The SDRAM 103 is used as a work area of the CPU 101.

The operation unit 106 is provided with various keys, buttons, a light emitting unit (LED), and the like. By operating the operation unit 106, the user can perform instruction operations such as adjusting the size of the image to be projected, adjusting the color tone, adjusting the focus, adjusting the keystone, changing the power mode, changing the image projection mode, and the like. And so on. These operation contents are notified (output) to the CPU 101.

The remote control receiver 107 has a receiver for receiving commands from the remote controller. The remote control receiver 107 receives and accepts instruction operations from the remote controller such as, for example, the size adjustment operation of the projected image, the color tone adjustment operation, the focus adjustment operation, the keystone adjustment operation, the power mode change, and the image projection mode change. The operation content is notified (output) to the CPU 101.

The fan 105 rotates or stops based on the control signal from the CPU 101 to exhaust the inside of the projector 1 and cool the inside of the projector 1. The media I / F 110 controls reading or writing (storage) of data to a recording medium such as a flash memory. The bus line is an address bus, a data bus, or the like for electrically connecting each component.

The network I / F109 is an interface for performing data communication using a communication network such as the Internet. An external device such as a personal computer device is connected to the external I / F 108. The control signal or image data from the personal computer device is acquired via this external I / F 108.

(Optical engine configuration)
The optical engine 15 forms a projected image based on the image data controlled by the CPU 101 and input to the projector 1. The optical engine 15 includes a light source unit 30, a lighting unit 40, an image display unit 50, and a projection optical system unit 60.

The light source unit 30 includes, for example, a light source 301 such as a light emitting diode (LED), and irradiates the lighting unit 40 with light under the control of the CPU 101. The light source may be, for example, a mercury high-pressure lamp or a xenon lamp other than the LED.

The lighting unit 40 includes, for example, a color wheel 401, a rotation detection sensor 400, a light tunnel 402, relay lenses 403 and 404, a cylinder mirror 405, a reflection mirror 406, and the like. The lighting unit 40 guides the light emitted from the light source unit 30 to the image display unit 50.

The color wheel 401 has a disk shape in which a plurality of segments (RGB transmission regions) that transmit only light in a specific wavelength region are arranged in order in the rotation direction. The light emitted from the light source 301 is converted into light of each color by the passing segment of the rotating color wheel 401. Further, by passing through the color wheel 401, the light in which each color of RGB is repeated every unit time is emitted toward the light tunnel 402.

The light tunnel 402 is formed of, for example, flat glass laminated in a polygonal tubular shape. Then, silver or a dielectric multilayer film or the like is vapor-deposited on the inner surface of the light tunnel 402 to reflect light. The light tunnel 402 guides the light emitted from the color wheel 401 to the relay lenses 403 and 404 with uniform illuminance.

The relay lenses 403 and 404 are formed by two combined lenses. The relay lenses 403 and 404 correct the axial chromatic aberration of the light emitted from the light tunnel 402 and collect the light. The light that has passed through the relay lenses 403 and 404 is incident on the light modulation element (display element) that is the image generation unit of the image display unit 50 via the cylinder mirror 405 and the reflection mirror 406.

The image display unit is controlled by the CPU 101 and modulates the light guided by the lighting unit 40 to generate a display image. As an example, a micromirror (DMD (Digital Micromirror Device) 551) 551 can be used as the display element. The input light is modulated by driving the DMD 551 on and off according to the image data by the CPU 101. As the display element, for example, a liquid crystal panel or the like can be used other than DMD551.

The projection optical system unit 60 includes a projection mirror 601 and a projection lens. The projection optical system unit 60 magnifies the display image formed by the DMD 551 of the image display unit 50 with a projection lens, and projects the projected image on the screen S. The number of projection lenses may be plural, or may be provided with an optical element such as a mirror.

Here, at the timing when the light of each color of RGB emitted through the color wheel 401 is irradiated to the DMD 551, it is necessary for the DMD 551 to perform a modulation operation corresponding to the light of that color. Therefore, it is necessary to synchronize the output timing of the drive signal for causing the DMD 551 to perform the modulation operation with the rotation timing of the color wheel 401. In order to achieve this synchronization, the color wheel 401 of the lighting unit 40 is provided with the above-mentioned first marker 700 (and the second marker 750) for detecting the rotation position.

Further, the lighting unit 40 is provided with a rotation detection sensor 400 for detecting the first marker 700 (and the second marker 750) provided at the rotation reference position of the color wheel 401.

When the first marker 700 (or the second marker 750) is in a position facing the rotation detection sensor 400, the rotation detection sensor 400 causes the first marker 700 (or the second marker 750) to be in the rotation reference position. A position detection signal indicating that it has arrived is output. Based on this position detection signal, the above-mentioned synchronization control is performed.

When power is supplied from the power supply unit 4 to start the CPU 101, the light source 301 of the light source unit 30 is turned on and controlled based on a rotation control program stored in advance in the ROM 102, and the fan 105 is turned on at a predetermined rotation speed. Rotation control. When the power supply of the power supply to the projector 1 is started, the optical engine 15 is in a state where the image can be displayed, and the power supply unit 4 supplies power to various other components.

Further, when the power switch of the projector 1 is turned off, a power off signal is supplied to the CPU 101. When the CPU 101 detects the power OFF signal, the light source 301 is turned off. After that, when a predetermined time elapses, the CPU 101 stops and controls the fan 105 to end the control process.

(Functional configuration)
FIG. 6 is a functional block diagram of the projector 1. The CPU 101 of the projector 1 executes an operation reception unit 250, a data reception unit 251 and a fan control unit 252, a position signal acquisition unit 253 and a display control unit 254, and an optical engine control by executing a rotation control program stored in the ROM 102. Each function of the unit 255 and the storage control unit 259 is realized. The optical engine control unit 255 includes an image generation unit 256, a light source control unit 257, and a synchronization control unit 258.

The operation reception unit 250 processes the CPU 101 and the operation unit 106, or the CPU 101 and the remote controller reception unit 107, and receives various inputs by the user. The display control unit 254 displays various information about the projector 1, for example, to the user by performing display processing of the CPU 101 and the operation unit 106. For example, when the operation unit 106 has a lamp, the display control unit 254 controls the lighting and extinguishing of the lamp, and when the operation unit 106 has a touch panel, controls the display on the touch panel.

The data receiving unit 251 processes the CPU 101 and the external I / F 108, and receives various data such as image data input from an external device such as a personal computer device. Further, the data receiving unit 251 processes the CPU 101 and the network I / F 109, and receives various data such as image data input via a predetermined network such as a LAN (Local Area Network) or the Internet.

The fan control unit 252 controls the rotation and stop of the fan 105. The position signal acquisition unit 253 is realized by the processing of the rotation detection sensor 400, detects a signal indicating the rotation position of the color wheel 401, and notifies the optical engine control unit 255.

The optical engine control unit 255 has a light source control unit 257, an image generation unit 256, and a synchronous control unit 258, and controls the entire optical engine 15. The light source control unit 257 controls the output of the light source 301. The light source control unit controls the output of the light source 301 by controlling the power supplied to the light source 301 as an example.

The image generation unit 256 controls the DMD 551 provided in the image display unit 50 of the optical engine 15 based on the input image data or the superimposed image (OSD) data such as menu information, and outputs an image to be projected on the screen S. Generate.

The synchronization control unit 258 generates a synchronization signal to the light source 301, the color wheel 401, and the DMD 551 based on the rotation position signal from the position signal acquisition unit 253, and synchronizes these movements. For example, the cycle of displacement of the DMD 551 and the cycle of rotating the color wheel 401 are synchronously controlled, and an image of each color is generated by the synchronous control time division.

In the storage control unit 259, the CPU 101 stores and controls various data in a storage unit such as the SDRAM 103 or NVRAM 104, or reads and controls various data from the storage unit. Further, the storage unit stores in advance the magnitude of the voltage of the rotation detection pulse detected by the rotation detection sensor 400 as a position signal or the pulse width of the rotation detection pulse.

In this example, the operation reception unit 250 to the memory control unit 259 are realized by software, but even if some or all of them are realized by hardware such as an IC (Integrated Circuit). Good.

Further, the rotation control program may be provided by recording a file in an installable format or an executable format on a recording medium readable by a computer device such as a CD-ROM or a flexible disk (FD). Further, the rotation control program may be provided by recording on a recording medium readable by a computer device such as a CD-R, a DVD (Digital Versatile Disk), a Blu-ray disc (registered trademark), or a semiconductor memory. Further, the rotation control program may be provided in the form of being installed via a network such as the Internet, or may be provided by being incorporated in advance in a ROM or the like in the device.

(Rotation detection operation)
Next, the rotation detection operation of the color wheel 401 in the projector 1 of the embodiment will be described. First, FIG. 7 is a timing chart showing the timing of each part when the rotation of the color wheel 401 is normally detected by the first marker 700 provided on the rotating body 450 of the color wheel 401. Of these, FIG. 7A shows the timing at which the light of each color is sequentially formed by the light from the light source 301 incident on each of the RGB segments of the rotating color wheel 401. FIG. 7B shows the timing of the rotation detection pulse obtained by detecting the first marker 700 attached to the rotating body 450 of the rotating color wheel 401 by the rotation detection sensor 400. FIG. 7C shows the timing at which the first marker 700 attached to the rotating body 450 of the rotating color wheel 401 is detected by the rotation detection sensor 400.

As can be seen from FIGS. 7 (a) to 7 (c), when the first marker 700 is normally detected by the rotation detection sensor 400, for example, B ( At the timing when the light of the color (blue) is formed (FIG. 7 (a)), the rotation detection sensor 400 detects the first marker 700 (FIG. 7 (c)) and outputs a rotation detection pulse (FIG. 7). (B)).

As described above, the amount of reflected light obtained from the first marker 700 is smaller than the amount of reflected light from other portions. Therefore, the rotation detection pulse of the first marker 700 shown in FIG. 7B is usually a rotation detection pulse having a negative polarity. FIG. 7B is an example in which the rotation detection pulse of the first marker 700 is illustrated as a positive polarity pulse by inversion control of the polarity of the entire rotation detection pulse.

Next, as shown in FIGS. 8A to 8B, the first marker 700 attached to the color wheel 401 may come off. As a result, as shown in FIG. 8B, the second marker 750 covered with the first marker 700 is exposed.

FIG. 9 is a timing chart showing the timing of each part immediately after the first marker 700 is peeled off from the rotating body 450 of the color wheel 401. Of these, FIG. 9A shows the timing at which the light of each color is sequentially formed by the light from the light source 301 incident on each of the RGB segments of the rotating color wheel 401. FIG. 9B shows the timing of the rotation detection pulse obtained by detecting the first marker 700 and the second marker 750 attached to the rotating body 450 of the rotating color wheel 401 by the rotation detection sensor 400. Shown. FIG. 9C shows the timing at which the first marker 700 and the second marker attached to the rotating body 450 of the rotating color wheel 401 are detected by the rotation detection sensor 400.

As described above, the second marker 750 is formed in black or the like different from the first marker 700 so as to have a detection level different from that of the first marker 700 by laser marking processing. Therefore, when the first marker 700 is peeled off, the level of the rotation detection pulse of the second marker 750 is the rotation detection of the first marker 700, as shown by the second rotation detection pulse in FIG. The level is lower than the pulse level.

In this example, the amount of reflected light from the second marker 750 is smaller than the amount of reflected light from the first marker 700. In this case, as described above, the level of the rotation detection pulse of the second marker 750 is lower than the level of the rotation detection pulse of the first marker 700. On the contrary, the amount of reflected light from the second marker 750 may be larger than the amount of reflected light from the first marker 700. In this case, the level of the rotation detection pulse of the second marker 750 is higher than the level of the rotation detection pulse of the first marker 700.

The first marker 700 and the second marker 750 may be formed so as to cause a difference in detection levels in this way.

In the case of this embodiment, even if the first marker 700 is peeled off, the second marker 750 is exposed and the rotation detection pulse can be continuously formed. Therefore, even if the first marker 700 is peeled off during projection, normal image projection can be continued.

(Warning operation)
Next, the display control unit 254 shown in FIG. 6 has the level of the rotation detection pulse of the first marker 700 or the second marker 750 acquired by the position signal acquisition unit 253 and the position signal stored in the storage unit. Levels are compared at all times or at regular time intervals. The position signal stored in the storage unit indicates the level of the rotation detection pulse of the first marker 700 and the level of the rotation detection pulse of the second marker 750. Therefore, by comparing the actually detected rotation detection pulse with the level of the position signal stored in the storage unit, the currently detected rotation detection pulse is the rotation detection pulse of the first marker 700. It can be determined whether the pulse is the rotation detection pulse of the second marker 750.

It is assumed that the rotation detection pulse currently detected by this discrimination process is determined to be the rotation detection pulse of the second marker 750. This indicates that the first marker 700 has peeled off from the rotating body 450. Therefore, the display control unit 254, which is an example of the notification unit, displays and controls a message prompting repair such as "The marker has peeled off from the color wheel. Please request repair for maintenance." As a result, the user can recognize the failure in which the marker is peeled off, and can promptly request repair.

(Modification example)
In the above example, the rotation detection pulse of the first marker 700 and the rotation detection pulse of the second marker 750 detect each of them by the level difference. This may be detected by the difference (time difference) between the pulse width of the rotation detection pulse of the first marker 700 and the pulse width of the rotation detection pulse of the second marker 750.

FIG. 10 shows the width of the first marker 700 and the width of the second marker so that the pulse width of the rotation detection pulse of the second marker 750 is wider than the pulse width of the rotation detection pulse of the first marker 700. It is a timing chart which shows the timing of each part when it is provided in the rotating body 450 wider than the width of 750. Of these, FIG. 10A shows the timing at which the light of each color is sequentially formed by the light from the light source 301 incident on each of the RGB segments of the rotating color wheel 401. FIG. 10B shows the timing of the rotation detection pulse obtained by detecting the first marker 700 and the second marker 750 attached to the rotating body 450 of the rotating color wheel 401 by the rotation detection sensor 400. Shown. FIG. 10C shows the timing at which the first marker 700 and the second marker attached to the rotating body 450 of the rotating color wheel 401 are detected by the rotation detection sensor 400.

In the case of this modification, when the first marker 700 is peeled off from the rotating body 450, the second marker 750 having a width narrower than the width of the first marker 700 is exposed, which is shown in FIG. 10 (b). As described above, the rotation detection pulse of the second marker 750, which is narrower than the pulse width of the rotation detection pulse of the first marker 700, is detected. Therefore, as described above, the projection can be continuously executed. Further, when the display control unit 254 detects the rotation detection pulse of the wide second marker 750 based on the position signal stored in the storage unit, the display unit displays the above-mentioned message prompting repair. Can be controlled.

(Effect of embodiment)
As is clear from the above description, in the projector device of the embodiment, the second marker 750 is provided on the rotating body 450 of the color wheel 401 by cutting, and the first marker 750 is covered with the second marker 750. Marker 700 is pasted. Then, normally, projection is performed based on the rotation detection pulse of the first marker 700, and when the first marker 700 is peeled off, it is based on the rotation detection pulse of the second marker 750 exposed thereby. Make a projection. As a result, even if the first marker 700 for detecting the rotation position of the color wheel 401 is peeled off, projection can be performed based on the second marker 750.

Further, when the display control unit 254 recognizes the rotation detection pulse of the second marker 750, a message prompting repair is displayed and controlled on the display unit, so that the user can perform a failure in which the first marker 700 is peeled off. Can be recognized and repairs can be requested promptly.

Finally, the embodiments described above are presented as an example and are not intended to limit the scope of the invention. This novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention.

For example, in the above description of the embodiment and the modified example, the paired first marker 700 and the second marker 750 are provided at one place, but the paired first marker 700 and the second marker 700 Markers 750 may be provided at a plurality of locations. In this case as well, the same effect as described above can be obtained.

Moreover, the embodiment and the modification of each embodiment are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and the equivalent scope thereof.

1 Projector 3 Exit window 9 External interface 10 Control unit 15 Optical engine 30 Light source unit 40 Illumination optical system unit 50 Image display unit 60 Projection optical system unit 253 Position signal acquisition unit 254 Display control unit 255 Optical engine control unit 301 Light source 401 Color wheel 430 Color wheel unit 450 Rotating body 460 Motor 461 Rotating shaft 700 First marker 750 Second marker

Japanese Unexamined Patent Publication No. 2012-137558

Claims (7)

A color wheel formed by arranging predetermined color segments in order along the rotation direction,
A rotating body provided coaxially with the rotation axis of the color wheel and rotating in synchronization with the color wheel,
A marker for detecting a rotation position provided at one or a plurality of locations of the rotating body is provided.
The color wheel unit is characterized in that a plurality of the markers are provided at the same position of the rotating body in an overlapping manner. The marker is provided with a first marker superimposed on the second marker at the same position on the rotating body, and the second marker has the same size as the first marker or the first marker. The color wheel unit according to claim 1, wherein the color wheel unit is formed smaller. The second marker is formed by cutting the rotating body.
The color wheel unit according to claim 2, wherein the first marker is provided by being glued so as to cover the second marker formed by cutting. The first marker and the second marker are formed so that the amount of light reflected is different from each other, and each of the first marker and the second marker formed based on the amount of light reflected. The color wheel unit according to claim 2 or 3, wherein the detection pulse has a different level depending on the amount of light reflected. The first marker and the second marker are formed so as to reflect light and have different widths, respectively, and are formed based on the amount of light reflected. The color wheel unit according to claim 2 or 3, wherein each detection pulse of the second marker has a different pulse width according to the amount of light reflected. A color wheel formed by arranging predetermined color segments in order along the rotation direction,
A rotating body provided coaxially with the rotation axis of the color wheel and rotating in synchronization with the color wheel,
Markers for detecting the rotation position provided at one or a plurality of locations of the rotating body, and
A light source that irradiates the color wheel with light,
A rotation detection sensor that detects the rotation position of the color wheel based on the marker,
An image forming unit for forming and projecting an image with light from the light source via each segment of the color wheel in synchronization with the rotation position of the color wheel detected by the rotation detection sensor
An image projection device characterized in that a plurality of the markers are provided at the same position of the rotating body in an overlapping manner. The marker is provided with the first marker superimposed on the second marker at the same position on the rotating body.
The sixth aspect of claim 6 is further provided with a notification unit that performs a predetermined notification operation when the rotation detection pulse detected by the rotation detection sensor is the rotation detection of the second marker. Image projection device.

Images