WO2010073914A1

WO2010073914A1 - Projection device

Info

Publication number: WO2010073914A1
Application number: PCT/JP2009/070653
Authority: WO
Inventors: 直樹久保; 眞弘中来田
Original assignee: コニカミノルタオプト株式会社
Priority date: 2008-12-26
Filing date: 2009-12-10
Publication date: 2010-07-01

Abstract

A projection device (A) includes: a light source unit (1); a projection unit (a scan unit) (2) for projecting light; a power source (3) for supplying drive power; a projection switch (41); a state detection unit (7) for detecting movement of the projection device; and a control unit (4) for the power source which starts normal power supply upon detection of that the projection device is in a still state and then an operation unit (41) is operated and which stops the normal power supply when the state detection unit (7) detects that the projection device is moved.

Description

Projection device

The present invention relates to a projection apparatus that projects an image on a projection unit such as a wall surface or a screen.

When performing presentations in front of a large audience, a projection device that projects an image on a wall or a screen is often used. As a conventional projection apparatus, a projector using a discharge lamp as a light source and using a two-dimensional spatial modulation element such as liquid crystal or DMD (Digital Micromirror Device) is known. A conventional projection apparatus modulates light from a light source with the spatial modulation element, enlarges the modulated image with a projection lens, and projects it onto a wall surface or a screen.

On the other hand, a laser scanning projection device using a laser light source has been attracting attention. A laser scanning projection apparatus includes a light source that can emit laser beams of R, G, and B colors, and projects an image by two-dimensionally scanning the laser light on a projection surface. The laser scanning type projection device uses a small MEMS (Micro Electronic Mechanical System) mirror instead of a two-dimensional spatial modulation element, and does not require a projection lens. Compared to the device, the size can be significantly reduced (size that can be driven by hand).

Further, the laser scanning projection device has a larger color reproduction range than a projection device using a conventional discharge lamp as a light source, and when light from the light source is unnecessary, for example, when projecting a black screen, There is an advantage that the emission of laser light from the laser light source can be stopped and the power consumption is low.

However, since the laser scanning projection apparatus irradiates laser light, there is a concern about safety during use (particularly, the risk of irradiating the eye with laser light). In view of this, a projection apparatus using a laser light source has been devised so that laser light is not directly irradiated to the eyes.

For example, in Japanese Patent Application Laid-Open No. 2005-134563, infrared light emitting means are arranged in a grid pattern on a screen, infrared light from the infrared light emitting means is detected, and whether there is an obstacle in front of the screen based on the detection result. If it is judged whether or not (a person is standing), and the non-irradiated area is judged to be obstructed, it is not irradiated with projection light, or what is irradiated with low brightness even if it enters the human eye is described ing.

Further, in the case of a small-sized projection device that can be driven by hand, there is a possibility that the projection device may be mistakenly directed at a person to project an image, and high-power (high brightness) laser light is irradiated to the person. May end up. In addition, in the case of a projection device of the same size and lightness that can not be held, the projection device itself is easy to move with a slight impact or vibration, and high-power (high-intensity) laser light is directed toward humans. May be emitted. Therefore, in order to suppress such an accident that occurs when projecting toward a person, there has been proposed one that suppresses the output (luminance) of the laser light emitted from the light source to a level that is not dangerous even if the person is always irradiated. ing.

JP 2005-134563 A

However, the projection apparatus described in Japanese Patent Application Laid-Open No. 2005-134563 requires a screen in which infrared light emitting means are arranged in a grid and a projector capable of detecting infrared light emitted from the infrared light emitting means. Becomes complicated.

Japanese Patent Laid-Open No. 2005-134563 also discloses a method for projecting onto a screen that does not have an infrared light emitting means so that the brightness of laser light emitted from a light source is safe even if it is incident on human eyes. Although what is suppressed is described, if the brightness of the laser beam is suppressed, the projected image becomes dark and difficult to see.

Therefore, an object of the present invention is to provide a projection apparatus that can reduce the risk of projection toward a person while keeping the brightness of the projected image high.

In order to achieve the above object, the present invention provides a light source unit, a projection unit that projects light emitted from the light source unit, a power source that supplies driving power to the light source unit and the projection unit, and a start of projection. An operation unit that can be operated by the user for switching the end, a state detection unit that detects whether or not the projection device itself is in a stationary state, and the state detection unit that detects that the projection device is stationary When the operation unit is operated, power supply to the light source unit and the projection unit is always started. When the state detection unit detects that the projection apparatus is not stationary, at least the light source And a power supply control unit that stops the constant supply of power to the unit.

According to this configuration, when the projection device is in a stationary state, power can be supplied to the light source unit and the projection unit at all times, and the projection device is not stationary due to vibration or impact. At least the constant supply of power to the light source unit is stopped, and the emission of projection light is stopped.

Since it is possible to suppress the projection light from being projected toward a place other than the projection surface (screen), the projection light of the projection device being projected is irradiated to a person (particularly the eye) by moving the projection device. As a result, the risk of injuries, blindness, etc. can be reduced. Thereby, it is difficult for humans to be harmed by the projection light from the projection device, and a high output (high luminance) projection light can be used as the projection light of the projection device.

In the above configuration, the state detection unit may include a gyro sensor or an acceleration sensor. The state detection unit may include a sensor that is provided on a bottom surface of the projection device and detects whether the projection device is placed on the installation unit with the bottom surface facing down. Furthermore, you may provide the touch sensor which detects that the user contacted as said state detection part. These sensors may be used in combination.

In the above configuration, when the state detection unit detects that the projection device is not in a stationary state, the power supply control unit supplies power to at least the light source unit only while the operation unit is being operated. You may make it perform.

According to this configuration, when the user performs the projection / stop operation while being held in the hand, the user is made aware of the start of the projection by not supplying power all the time when the hand is held. Since electric power is supplied (projected) only when the operation unit is operated, it is possible to reduce the occurrence of accidents in which projected light is irradiated toward a person. Thereby, it is possible to use high output (high luminance) projection light for the projection apparatus.

To achieve the above object, the present invention provides a light source unit, a projection unit that projects light emitted from the light source unit, an internal power source that is disposed inside and supplies driving power to the light source unit and the projection unit. An external connection unit that is connected to an external power source that is disposed outside and supplies driving power to the light source unit and the projection unit, an operation unit that can be operated by a user for switching between start and end of projection, and When an external power source detection unit that detects whether or not the external power source is connected to the projection device, and the external power source detection unit detects a connection with the external power source, and the operation unit is operated, The power source is constantly supplied to the light source unit and the projection unit, the connection to the external power source is not detected by the external power source detection unit, and the operation unit is not continuously operated. Sometimes, there is provided a projection apparatus comprising a power control unit to stop the supply of power to at least the light source unit.

According to this configuration, when the projection device is connected to the external power source, when the operation unit is operated, the power source is always started to be supplied to the light source unit and the projection unit, and the internal power source is used. When the unit is not continuously operated, power is not supplied to the light source unit.

When the projection apparatus is connected to an external power source, the projection apparatus is limited to a connection cable that supplies power, and the movement range is limited. Thereby, it is considered that the possibility of irradiating the projection light toward the person is reduced, and the projection light is difficult to be irradiated toward the person. Therefore, even if power is constantly supplied to the light source unit and the projection unit, the injury ( Low risk of burns and blindness.

On the other hand, when an internal power supply is used, since there is no restriction on the movement of the projection device, there is a high risk that the projection light from the projection device is irradiated to a person. Therefore, when the user does not continuously operate the operation unit that switches between projection / stop, power is not supplied to the light source unit.

This makes it possible to suppress the occurrence of injury, burns, or the like due to projection light being irradiated from the projection device toward the person. Moreover, since it can suppress that projection light is irradiated toward a person, even if what uses the light source part which radiate | emits light of high output (high brightness) should be used safely. Is possible. Note that power may be constantly supplied to the projection unit regardless of an internal power supply or an external power supply.

In the above configuration, when the supply of power to the light source unit and the projection unit is stopped as the power supply control unit, the supply of power to the projection unit is stopped after the power supplied to the light source unit is stopped. Things can be mentioned.

It is possible to prevent the projection unit from stopping first and irradiating the light emitted from the light source in a concentrated manner without being scanned.

In the above configuration, the light source unit includes a laser diode that emits laser light. In addition to the laser diode, a light source such as an LED or a xenon lamp can be used.

According to the present invention, it is possible to provide a projection apparatus that can reduce the risk of projection toward a person while keeping the brightness of the projected image high.

These are figures which show the state which is projecting the image with the projection apparatus concerning this invention. These are block diagrams which show schematic arrangement | positioning of the projection apparatus concerning this invention. These are figures which show the structure of a MEMS mirror device. These are flowcharts which show operation | movement of the projection apparatus shown in FIG. These are the flowcharts which show the electric power supply stop operation | movement of the projection apparatus shown in FIG. These are block diagrams which show the schematic arrangement | positioning state of the other example of the projection apparatus concerning this invention. These are the block diagrams which show the further another example of the projection apparatus concerning this invention. These are side views of the projection apparatus shown in FIG. These are the block diagrams of the further another example of the projection apparatus concerning this invention. These are flowcharts which show operation | movement of the projection apparatus shown in FIG.

A projection apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a state in which an image is projected by the projection apparatus according to the present invention. As shown in FIG. 1, the projection apparatus A is an image projection apparatus that projects an image on a screen SC by performing raster scanning of laser light with horizontal scanning and vertical scanning. A laser light source that emits a laser beam as a light source and an image is formed on the screen by two-dimensionally scanning the laser beam, so that a projection lens is unnecessary, and the projection apparatus A has a conventional two-dimensional light spatial modulation element. It can be downsized compared to the one used. Further, compared with a conventional projection apparatus using a two-dimensional spatial light modulation element, the laser light is turned on / off according to the image, so that power consumption is low.

Since the projection apparatus according to the present invention is small and consumes less power, it can be driven by a battery, so that it can be driven (projected on a screen) while being held by a user. In addition, although the screen SC is mentioned as a surface on which the image is projected, it is not limited to this, and it is needless to say that the image can be projected onto an object that can reflect light such as a white wall.

The projection apparatus A will be described in more detail with reference to the drawings. FIG. 2 is a block diagram showing a schematic arrangement of the projection apparatus according to the present invention. As shown in FIG. 2, the projection apparatus A includes a light source unit 1, a scanning unit 2 that is a projection unit, an internal power supply 3, a power supply control unit 4, a projection switch 41 that is an operation unit, and an external input unit 5. A signal processing unit 6, a state detection unit 7, a control unit 8, and a memory 81.

As shown in FIG. 2, the light source unit 1 receives a red laser light source 10R that emits a laser beam with a red wavelength, a green laser light source 10G that emits a laser beam with a green wavelength, and a laser beam with a blue wavelength. And a blue laser light source 10B that emits light. In addition, although the thing using a laser light source (laser diode) is employ | adopted as the light source part 1, it is not limited to it, It is small and can radiate | emit the light of a big output (for example, LED A light source using an element, a xenon lamp, or the like) can be widely used.

The light source unit 1 includes a collimator lens 11 for converting laser light, which is divergent light, into parallel light for each laser light source. The light source unit 1 uses two dichroic prisms 12 to combine red laser light, green laser light, and blue laser light into one beam. The dichroic prism 12 is a prism that reflects light of a predetermined wavelength and transmits light of other wavelengths. Further, the light source unit 1 is provided with a laser driver 13, and the laser driver 13 adjusts the output (luminance) of laser light emitted from the red laser light source 10R, the green laser light source 10G, and the blue laser light source 10B. . The light emitted from the light source unit 1 is combined into one beam as described above and enters the scanning unit 2.

The scanning unit 2 includes a MEMS (Micro Electro Mechanical System) mirror device 21 and a mirror driver 22. The MEMS mirror device 21 will be described with reference to the drawings. FIG. 3 is a configuration diagram of the MEMS mirror device. The MEMS mirror device 21 includes a rectangular fixed frame 211, a drive unit 212 arranged inside the fixed frame 211, a rhombus-shaped support frame 213 held on the fixed frame 212 via a torsion bar 216, and a support A mirror 210 that is supported by a frame 213 via a torsion bar 215 and reflects light emitted from the light source unit 1 is provided. Note that the scanning unit 2 is not limited to the one using the MEMS mirror device, and a configuration that can project the light from the light source 1 as an image can be widely used.

As shown in FIG. 3, in the drive unit 212, drive elements 214 having a unimorph structure in which a material having a reverse piezoelectric effect such as PZT (lead zirconate titanate) is attached on a substrate are arranged at four corners. The four drive elements 214 are arranged so as to be symmetric with respect to each of two orthogonal axes. In the following description, one of the two axes is an X axis (horizontal scanning direction: Sh direction in FIG. 1), and the other is a Y axis (vertical scanning direction: Sv direction in FIG. 1).

The support frame 213 is supported by a torsion bar 216 disposed so as to overlap the X axis. At this time, the shorter diagonal of the support frame 213 overlaps the X axis. One end of the torsion bar 216 is fixed to the fixed frame 211, and the other end holds the support frame 213. The torsion bar 216 has a thin portion on the fixed frame 211 side and a thick portion on the support frame 213 side. As shown in FIG. 3, the torsion bar 216 is connected to each of the drive elements 214 arranged side by side in the Y-axis direction.

The mirror 210 is supported by the support frame 213 via a torsion bar 215 arranged on the longer diagonal of the support frame 213. One end of the torsion bar 215 is fixed to the support frame 213, and the other end holds a mirror 210 (hatching in the figure indicates a reflecting surface). The torsion bar 215 is arranged so as to overlap with an axis orthogonal to the X axis (Y axis when the mirror is stationary). The torsion bars 215 and 216 act as so-called torsion springs that are elastically twisted.

The driving element 214 is an element that is displaced by supplying electric power. In the MEMS mirror device 21, the mirror 210 can be vibrated around the X axis (around the torsion bar 216) and around the Y axis (around the torsion bar 215) by adjusting the driving timing of the four drive elements 214. . The vibration of the mirror 210 will be described in detail. For convenience of explanation, the drive elements 214 (shaded portions in the figure) are numbered 214a, 214b, 214c, and 214d as shown in FIG.

First, the vibration around the torsion bar 216 will be described. By driving the drive element 214a and the drive element 214c as a set and the drive element 214b and the drive element 214d as a set, the torsion bar 216 between the drive element 214a and the drive element 214b and between the drive element 214c and the drive element 214d are driven. A rotational force in the same direction acts on the torsion bar 216. By alternately driving the two sets, the torsion bar 216 is twisted, and the support frame 213 held by the torsion bar 216 vibrates around the X axis. Note that the twisting direction of the torsion bar 215 is perpendicular to the vibration direction around the X axis, and therefore does not affect the vibration around the X axis.

Next, the vibration around the torsion bar 215 will be described. By alternately driving the set of the drive element 214a and the drive element 214b and the set of the drive element 214c and the drive element 214d, vibration around the Y axis is generated. By setting the vibration frequency to the resonance frequency of the mirror 210 and the torsion bar 215, the torsion bar 215 is twisted, and the mirror 210 can be vibrated around the torsion bar 215 at the resonance frequency. As described above, the mirror 210 can be vibrated around the torsion bar 216 and around the torsion bar 215. Using the vibration of the mirror 210, the laser light reflected by the mirror 210 can be two-dimensionally scanned on the screen.

In the scanning unit 2 used in the projection apparatus of the present invention, the frequency when vibrating around the torsion bar 216 (vertical scanning frequency) is 60 Hz, and the frequency when vibrating around the torsion bar 215 (horizontal scanning frequency). Although it is about 30 kHz, it is not limited to this. Moreover, although the MEMS mirror device 21 is used for the projection part, it is not limited to this, What can deflect | deviate the light from a light source part two-dimensionally is widely employable. In this embodiment, a piezoelectric element having a reverse piezoelectric effect is used as the MEMS mirror device, but the present invention is not limited to this, and the mirror may be driven by magnetic force or electrostatic force. The scanning unit 2 includes a mirror driver 22 for driving the driving unit 212.

The internal power supply 3 includes a battery disposed inside the main body of the projection apparatus A. Examples of the battery include an easily detachable dry battery, a rechargeable battery that is always disposed inside the projection apparatus A, and can be repeatedly used by recharging when the amount of stored power decreases, a fuel cell, and the like.

The projection apparatus A can be miniaturized by using the MEMS mirror device 21 for the scanning unit 2 and a small battery as the internal power supply 3. For example, the projection apparatus A can be manufactured in a hand-held size.

The power control unit 4 is connected to the control unit 8. The power supply control unit 4 performs a control to switch between a state in which the power from the internal power supply 3 can be constantly supplied to the light source unit 1 and the scanning unit 2 and a state in which the continuous supply is stopped according to a command from the control unit 8. The power supply control unit 4 is a circuit that can constantly supply power from the internal power supply 3 to the light source unit 1 and the scanning unit 2, and stops supplying the power constantly and supplies power while the projection switch 41 is continuously operated. And a circuit for performing. Note that the circuit that constantly supplies power may be such that the light source unit 1 and the scanning unit 2 such as a bypass circuit are directly connected to the internal power supply 3, and an element that can maintain an energized state (for example, switching) (Element, relay, etc.) may be provided.

The projection switch 41 is connected to the control unit 8, and the state of the projection switch 41 is detected by the control unit 8. The projection switch 41 is an automatic return type push button switch that is ON only while being pressed and automatically returns to OFF when the projection is stopped. The projection switch 41 is not limited to the automatic return type push button switch, and a wide range of switches that turn on only when operated, such as those operated by tilting the lever and those operated by sliding, can be widely used. It is. When the projection switch 41 is pressed, the projection apparatus A performs projection.

The external input unit 5 is connected to the control unit 8 and inputs information (for example, video information, image information) from an external device such as a DVD or a BD. Video data input from the external input unit 5 is stored in the memory 81. An example of the memory 81 includes a memory element such as a DRAM that can be read and written.

The signal processing unit 6 is controlled by the control unit 8, generates video signals for driving the red, green, and blue laser light sources based on the video data stored in the memory 81, and sends them to the laser driver 13. To be sent. Further, in order to send a driving timing signal to the mirror driver 22 provided in the scanning unit 2 and reflect the laser light emitted from the light source unit 1 to an appropriate position on the screen, the driving unit 212 at an appropriate timing. Drive. Note that the video data input from the external input unit 5 is not stored in the memory 81 but directly converted into a video signal by the signal processing unit 6 and transmitted to the laser driver 13, and the mirror is synchronized with the drive timing of the laser driver 13. A driving timing signal may be transmitted to the driver 22 to drive the driving unit 212.

The state detection unit 7 is connected to the control unit 8, detects whether the projection apparatus A is in a stationary state, and sends the detection result to the control unit 8. The state detection unit 7 includes a gyro sensor 71 as a sensor for detecting whether or not the projection apparatus A is in a stationary state. The gyro sensor 71 is a sensor that detects angular velocity. When the projection apparatus A is tilted, the gyro sensor 71 detects the occurrence of angular velocity. In the present invention, the state detection unit 7 sends a signal to the control unit 8 that the projection device A is not stationary when the projection device A is not stationary (that is, when the gyro sensor 71 detects angular velocity). is there.

In addition, the present invention is not limited to this, and the projection device such as a device that always transmits a signal and transmits a signal that is different from normal when the projection apparatus is not stationary, or a device that transmits a signal only when the projection device is stationary. What can transmit the information of whether the apparatus A is a stationary state to the control part 8 is employable widely.

When the projection apparatus A is placed or fixed on an installation surface such as an installation table, the projection apparatus A is stationary and the gyro sensor 71 does not detect angular velocity. For example, when the projection apparatus A is held in the user's hand, the human hand is mostly moving delicately, and the gyro sensor 71 detects the occurrence of angular velocity due to the delicate movement. At this time, the state detection unit 7 sends a signal to the control unit 8 that the projection apparatus A is not stationary.

The control unit 8 includes a processing device such as a CPU. The control unit 8 is connected to the power supply control unit 4, the projection switch 41, the external input unit 5, the signal processing unit 6, the state detection unit 7, and the memory 81, and signals input from the projection switch 41 and the state detection unit 7. Based on the above, the laser driver 13, the scanning unit 2, the power supply control unit 4, the external input unit 5 and the signal processing unit 6 can be driven and controlled. In addition to storing the video data as described above, the memory 81 can also record information necessary for the control unit 8 to control.

The operation of the projection apparatus A will be described with reference to the drawings. FIG. 4 is a flowchart showing the operation of the projection apparatus shown in FIG. First, consider the case where the projection apparatus A is placed on the installation surface. The projection apparatus A is stationary by being disposed on the installation surface.

After the main power supply of the projection device A is turned on (step S11), the control unit 8 causes the state detection unit 7 to check whether the projection device A is no longer stationary (step S12). When the projection apparatus A is stationary (no signal is input from the state detection unit 7) (NO in step S12), the control unit 8 checks whether or not an image is projected by the projection apparatus A. (Step 13). As a method for confirming whether or not the control unit 8 is projected, there is a method in which the power source control unit 4 is activated and the internal power source 3 detects whether power is supplied to the light source unit 1 and the scanning unit 2. be able to.

When the projection apparatus A is not projecting (NO in step 13), the control unit 8 confirms whether the projection switch 41 is pressed (operated) (step S14). If the projection switch 41 is not pressed (not operated) (NO in step S14), the control unit 8 returns to step S12 and resumes detecting whether or not the projection apparatus A is no longer stationary. When the projection switch 41 is pressed (operated) (YES in step S14), the control unit 8 causes the power supply control unit 4 to supply power from the internal power supply 3 to the light source unit 1 and the scanning unit 2 (step S15). ), And starts projecting the video onto the screen SC.

If it is detected in step S13 that the control unit 8 is projecting an image on the screen SC (YES in step S13), the control unit 8 causes the power source control unit 4 to connect the light source unit 1 and the internal power source 3. The power supply to the scanning unit 2 is continued (step S15). Then, the control unit 8 confirms whether or not the projection of the image from the projection apparatus A onto the screen SC has been completed (step S16). When the control unit 8 confirms that the projection has not ended (NO in step S16), the control unit 8 returns to step S12 and restarts detection of whether or not the projection apparatus A is stationary.

When it is detected that the projection of the projection apparatus A has been completed (YES in step S16), the control unit 8 instructs the power supply control unit 4 to stop the supply of power to the light source unit 1 and the scanning unit 2 ( Step S17). Then, the control unit 8 turns off the main power supply of the projection apparatus A (step S18). Note that the control unit 8 also determines that projection has ended (YES in step S16) and stops supplying power to the power supply control unit 4 when it is detected in step S16 that the imaging switch 41 has been operated. An instruction is issued (step S17). The image is projected on the screen SC from the projection apparatus A by the above procedure.

As described above, the control unit 8 supplies power from the internal power supply 3 to the light source unit 1 and the scanning unit 2 to the power supply control unit 4 until the projection switch 41 is pressed when projection is not started. I try not to let you. In addition, once the projection is started, the control unit 8 supplies power to the light source unit 1 and the scanning unit 2 until the projection is finished or the projection apparatus A is not in a stationary state regardless of the state of the projection switch 41. The supplied state, i.e., the constant power supply state is maintained.

Next, the case where the projection apparatus A is used by being held in the user's hand will be described. After the main power supply is turned on (step S11), the control unit 8 causes the state detection unit 7 to check whether the projection apparatus A is in a stationary state (step S12). When the control unit 8 receives a signal from the state detection unit 7 that the projection apparatus A is not in a stationary state (YES in step S12), the control unit 8 confirms whether the projection apparatus A is projecting an image (step S19). Confirmation during projection is performed in the same manner as described in step S13 above.

If the projection apparatus A is projecting (YES in step S19), it is confirmed whether the projection switch 41 is pressed (operation is continued) (step S110). When the projection switch 41 is pressed (the operation is continuing) (YES in step S110), the control unit 8 sends a command to the power supply control unit 4, and the light source unit 1 and the scanning unit 2 from the internal power supply 3. Power is supplied to (step S15). After step S15, in the same manner as described above, it is confirmed whether or not the projection is finished in step S16. If the projection is not finished (NO in step S16), the process returns to step S12 and whether or not the projection apparatus A is no longer stationary. Restart detection. In the case of the end of projection (in the case of YES in step S16), the power supply is stopped (step S17), and the operation is ended when the main power is turned off (step S18).

If the projection switch 41 is not pressed in step S110 (the operation is not continuing) (NO in step S110), the control unit 8 sends a command to the power supply control unit 4, and the light source unit 1 and scanning are performed from the internal power supply 3. The supply of power to the unit 2 is stopped (step S111).

After it is confirmed that the projection apparatus A is not projecting (NO in step S19) or after the supply of power from the internal power supply 3 to the light source unit 1 and the scanning unit 2 is stopped in step S111, the control unit 8 performs projection. It is confirmed whether or not the process is finished (step S112). Since the method for confirming the end of projection is the same as that described in the description of step S16, the details are omitted. When it is confirmed that the projection is completed (YES in step S112), the process proceeds to step S18, the main power supply is turned off, and the drive of the projection apparatus A is terminated. If the projection has not ended (NO in step S112), the process returns to step S12, and restarts from detection of whether or not the projection apparatus A is in a stationary state.

As described above, when the projection apparatus A is not stationary, power is supplied to the light source unit 1 and the scanning unit 2 only when the projection switch 41 is pressed (operation is continued).

The operation of stopping power supply (step S17 or step S111) will be described in detail with reference to the drawings. FIG. 5 is a flowchart showing a power supply stop operation of the projection apparatus shown in FIG. When the projection apparatus A projects an image on the screen SC, the laser light is emitted from the

laser light sources

10R, 10G, and 10B, and the MEMS mirror device 21 is in a driving state.

If the MEMS mirror device 21 is stopped in a state where the laser light is emitted, there is a risk that the laser light is concentrated and irradiated when the mirror 210 is stopped. Therefore, when stopping the supply of power to the light source unit 1 and the scanning unit 2 of the projection apparatus A, first, the supply of power to the light source unit 1 is stopped (step S171). After the emission of laser light from the

laser light sources

10R, 10G, and 10B is stopped, the supply of power to the scanning unit 2 is stopped (step S172). Thus, by determining the order of stopping the supply of power, it is possible to suppress the risk of the laser light being concentrated at one point.

Another example of the projection apparatus according to the present invention will be described with reference to the drawings. FIG. 6 is a block diagram showing a schematic arrangement state of another example of the projection apparatus according to the present invention. In the projection apparatus B shown in FIG. 6, the state detection unit 7 includes an acceleration sensor 72 instead of the gyro sensor 71. Other than that, it has the same configuration as the projection apparatus A, and substantially the same parts are denoted by the same reference numerals. Detailed descriptions of parts having substantially the same configuration are omitted.

In the projection apparatus B shown in FIG. 6, the state detection unit 7 includes an acceleration sensor 72. The acceleration sensor 72 is fixed to the projection device B. The acceleration sensor 72 is a sensor that measures the acceleration of the object (speed change rate: speed change amount per unit time). The state detection unit 7 including the acceleration sensor 72 can also detect the linear movement of the projection apparatus B.

Thereby, even when the projection apparatus B is moved in parallel (for example, when the stage on which the projection apparatus B is placed is moved horizontally or vertically, that is, a movement that cannot be detected by the gyro sensor), It is possible to detect that the projection apparatus B is moved.

The operation procedure is the same as that of the projection apparatus A except that the posture is detected by the acceleration sensor 72, and a detailed description thereof will be omitted.

Still another example according to the present invention will be described with reference to the drawings. FIG. 7 is a block diagram showing still another example of the projection apparatus according to the present invention, and FIG. 8 is a side view of the projection apparatus shown in FIG. The projection device C shown in FIGS. 7 and 8 has the same configuration as the projection device A except that the state detection unit 7 includes a bottom switch 73 provided on the bottom surface of the projection device C instead of the gyro sensor 71. The same parts are denoted by the same reference numerals. Detailed descriptions of substantially the same parts are omitted.

As shown in FIGS. 7 and 8, the projection apparatus C includes a bottom switch 73 having the state detection unit 7 provided on the bottom surface. When the projection device C is disposed on the stable installation surface St (for example, the upper surface of the installation table), the bottom switch 73 is pushed by the installation surface St, and the bottom switch 73 is turned on. When the bottom switch 73 is turned on, the state detection unit 7 recognizes that the projection apparatus C is stationary. On the other hand, when the projection apparatus C is lifted, the bottom switch 73 that has been pushed on the installation surface St until then returns to the original state, and the bottom switch 73 is turned off. At this time, the state detection unit 7 detects that the projection apparatus C is not in a stationary state. Instead of the bottom switch 73, a sensor that can detect that the projection apparatus is installed on the installation surface may be used.

As described above, by using the projection apparatus C, the projection apparatus C is separated from the installation surface St even when the projection apparatus C is moved with a minute movement that is difficult to detect with a gyro sensor or an acceleration sensor. Can be detected. The state detection unit 7 is the same as the projection apparatus A except that the state detection unit 7 includes a bottom switch 73 instead of the gyro sensor 71, and detailed description thereof is omitted.

In this embodiment, the state detection unit 7 having the bottom switch 73 on the bottom surface is described as an example, but the present invention is not limited to this. For example, you may provide the touch sensor which detects that the hand and / or finger contacted in the part which the user's hand and / or finger of the holding part (grip) of a projection apparatus contact. By providing such a touch sensor, it is possible to detect that the projection device has been lifted by the user, and thereby detect that the projection device has been moved. As a touch sensor, what detects the pressure by a hand and / or a finger, what detects the weak electric current which flows into a hand and / or a finger, etc. can be illustrated. As the projection switch, a sensor that reacts to a touch of a hand and / or a finger may be used similarly to the touch sensor.

Although the state detection unit 7 of each of the projection apparatuses A to C includes a gyro sensor 71, an acceleration sensor 72, and a bottom switch 73, the present invention is not limited thereto. For example, two or more types of the gyro sensor 71, the acceleration sensor 72, and the bottom switch 73 may be used in combination with the state detection unit 7. In addition, elements (switches, sensors) that can detect movement of the projection apparatus other than those described above may be provided. In this case, it may be provided together with at least one of the above three elements.

When two or more elements such as sensors and switches are used in combination, the state detection unit transmits a signal to the control unit when any of the elements detects movement. Also good. In addition, the state detection unit sends a signal to the control unit that the projection device is moving when all the elements detect movement or when at least one of the specific element and other elements detects the state. You may make it transmit.

Still another example of the projection apparatus according to the present invention will be described with reference to the drawings. FIG. 9 is a block diagram of still another example of the projection apparatus according to the present invention. The projection apparatus D shown in FIG. 9 includes an external power supply detection unit 9 instead of the state detection unit 7. Moreover, the external connection part 91 for connecting with the external power supply Pws is provided. Other than that, it has the same configuration as the projection apparatus A, and substantially the same parts are denoted by the same reference numerals. Detailed descriptions of substantially the same parts are omitted.

The projection apparatus D includes an internal power supply 3 and an external connection 91 for connecting a connection cable Pca connected to the external power supply Pws. The external connection unit 91 includes an external power supply detection unit 9 that detects whether the connection cable Pca is connected to the external connection unit 91 and power is supplied to the projection device D from the external power supply Pws. I have. When the internal power supply 3 is a rechargeable battery, the external connection unit 91 and the internal power supply 3 may be connected to charge the internal power supply 3.

The external power supply Pws is not something that can be easily transported by the user, such as an external battery, and cannot be easily moved or moved like a large battery, a generator, or a wall outlet. By connecting the projection device D to the external power supply Pws with the connection cable Pca, the distance between the projection device D and the external power supply Pws is limited. Since the movement range of the projection device D is limited by the length of the connection cable Pca, the possibility of projecting toward a portion where a person is present is low.

Next, the operation of the projection apparatus D will be described. FIG. 10 is a flowchart showing the operation of the projection apparatus shown in FIG. First, the operation of the projection apparatus D connected to an external power supply will be described.

After the main power supply of the projection device D is turned on (Step S21), the control unit 8 confirms whether the external power supply detection unit 9 is connected to the external power supply Pws (Step S22). When the projection apparatus D is connected to the external power supply Pws (YES in step S22), the control unit 8 checks whether or not the projection apparatus D is projecting (step 23). As a method for confirming whether the control unit 8 is projecting, the power control unit 4 is driven, and power is supplied from the external power source Pws to the light source unit 1 and the scanning unit 2 via the connection cable Pca and the external connection unit 91. The method of detecting this can be mentioned.

If the projection apparatus D is not projecting (NO in step 23), the control unit 8 confirms whether the projection switch 41 is pressed (operated) (step S24). If the projection switch 41 is not pressed (not operated) (NO in step S24), the control unit 8 returns to step S22 and resumes detection of whether or not the projection device D is connected to the external power supply Pws. To do. When the projection switch 41 is pressed (operated) (YES in step S24), the control unit 8 sends the power source control unit 4 from the external power source 3 to the light source unit 1 through the connection cable Pca and the external connection unit 91. Power is supplied to the scanning unit 2 (step S25), and projection of an image onto the screen SC is started.

When the projection is being performed in step S23 (YES in step S23), the control unit 8 sends the power source control unit 4 to the light source unit 1 and the scanning unit 2 from the external power source Pws via the connection cable Pca and the external connection unit 91. Is continued (step S25). And the control part 8 confirms whether the projection of the image | video from the projection apparatus D to the screen SC was complete | finished (step S26). If it is confirmed that the projection has not ended (NO in step S26), the process returns to step S22, and detection of whether or not the projection apparatus D is connected to the external power supply Pws is resumed.

When the end of projection from the projection device D to the screen SC is detected (YES in step S26), the control unit 8 sends a command to the power supply control unit 4 from the external power supply Pws via the connection cable Pca and the external connection unit 91. Then, the supply of power to the light source unit 1 and the scanning unit 2 is stopped (step S27). Then, the control unit 8 turns off the main power supply of the projection apparatus A (step S28). Through the above procedure, the projection apparatus A projects an image on the screen SC.

As described above, when the projection is not started, the control unit 8 sends the light source from the external power source Pws to the power source control unit 4 via the connection cable Pca and the external connection unit 91 until the projection switch 41 is pressed. The power is not supplied to the unit 1 and the scanning unit 2. When the projection switch 41 is operated and projection is started, thereafter, the control unit 8 is switched from the external power source Pws until the projection is completed regardless of the state of the projection switch 41 or until the projection device D is switched to the internal power source 3. A state in which power is supplied to the light source unit 1 and the scanning unit 2 via the connection cable Pca and the external connection unit 91, that is, a state in which power is always supplied is maintained.

Next, the case where the internal power supply 3 is used in the projection apparatus will be described. After the main power source is turned on (step S21), the control unit 8 causes the external power source detection unit 9 to check whether it is connected to the external power source Pws (step S22). When the external power source detection unit 9 does not detect the connection with the external power source Pws (NO in step S22), the control unit 8 is not connected to the external power source Pws from the external power source detection unit 9 (driven by the internal power source 3). ) Is acquired, and it is confirmed whether or not an image is projected by the projection apparatus D (step S29). The confirmation during projection is performed by the same method as described in step S23.

When the projection device D is projecting (NO in step S23), it is confirmed whether the projection switch 41 is pressed (operation is continued) (step S210). When the projection switch 41 is pressed (the operation is continuing) (YES in step S210), the control unit 8 sends a command to the power supply control unit 4, and the light source unit 1 and the scanning unit 2 from the internal power supply 3. Is supplied with power (step S211). Then, the process jumps to step S26 to check whether the projection is finished. If not finished (NO in step S26), the process returns to step S22 and the detection of whether the projection apparatus D is connected to the external power supply Pws is resumed. . When projection is completed (YES in step S26), power supply is stopped (step S27), and operation is terminated when main power is turned off (step S28).

If the projection switch 41 has not been pressed (the operation is not continuing) (NO in step S210), the control unit 8 sends an instruction to the power supply control unit 4 from the internal power supply 3 to the light source unit 1 and the scanning unit 2. Is stopped (step S212).

After it is confirmed that the projection apparatus A is not projecting (NO in step S29) or after the supply of power from the internal power source 3 to the light source unit 1 and the scanning unit 2 is stopped in step S212, the control unit 8 operates the projection apparatus. It is confirmed whether the projection of the image from D to the screen SC is completed (step S213). Since the method for confirming the end of projection is the same as that described in the description of step S26, the details are omitted. When it is confirmed that the projection is completed (YES in step S213), the process proceeds to step S28, the main power supply is turned off, and the drive of the projection apparatus D is terminated. If the projection has not ended (NO in step S213), the process returns to step S22 and restarts from the detection of whether or not the projection apparatus D is connected to the external power supply Pws.

As described above, when the projection apparatus D is not connected to the external power source Pws (power is supplied from the internal power source 3), only when the projection switch 41 is pressed, the light source unit 1 and the scanning unit 2 are used. Is supplied with power.

In each of the above-described embodiments, the projection apparatus including the state detection unit 7, the external power supply detection unit 9, and the external connection unit 91 is described as an example. However, the present invention is not limited thereto, and the projection apparatus is not limited thereto. May include both the state detection unit 7, the external power supply detection unit 9, and the external connection unit 91. In this case, when connected to an external power supply, power is always supplied regardless of the signal from the state detection unit 7, and in the case of an internal power supply, the power supply is based on the signal from the state detection unit 7. The supply may be controlled.

Further, in each of the above embodiments, the control unit 8 stops the power supply to the light source unit 1 and the scanning unit 2, but only the power supply to the light source unit 1 may be stopped. Even in this case, since the projection light is not emitted, it is possible to suppress the occurrence of problems (injuries, blindness, etc.) that occur when the projection light is directly applied to the human body.

In each of the above embodiments, a light source that uses a laser light source that emits laser light is exemplified as the light source of the projection apparatus. However, the present invention is not limited to this. For example, projection light such as an LED or a xenon lamp may be used. A light source capable of emitting light can be widely used.

The small-sized projection device described in each of the above-described embodiments is built in the mobile terminal in order to display internal information of the mobile terminal such as a mobile phone, a PDA (personal digital assistant), and a mobile GPS device to the outside. Can be illustrated.

The description of the above embodiment is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. It is needless to say that each part configuration of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

The present invention can be applied to a safety measure for a small projection apparatus using a high-intensity light source that may cause injury or blindness when irradiated to human eyes such as laser light or LED.

A, B, C, D Projection device 1 Light source unit 10R Red laser light source 10G Green laser light source 10B Blue laser light source 11 Collimator lens 12 Dichroic prism 13 Laser driver 2 Scan unit 21 MEMS mirror device 210 Mirror 211 Fixed frame 212 Drive unit 213 Support Frame 214 Drive element 215 Torsion bar 216 Torsion bar 22 Mirror driver 3 Internal power supply 4 Power supply control unit 41 Projection switch 5 External input unit 6 Signal processing unit 7 State detection unit 71 Gyro sensor 72 Acceleration sensor 73 Bottom switch 8 Control unit 81 Memory 9 External power supply detection part 91 External connection part Pws External power supply

Claims

A light source unit;
A projection unit for projecting light emitted from the light source unit;
A power source for supplying driving power to the light source unit and the projection unit;
An operation unit that can be operated by the user for switching between start and end of projection;
A state detection unit for detecting whether or not the projection device itself is stationary;
When the state detection unit detects that the projection device is stationary and the operation unit is operated, the state detection unit starts to constantly supply power to the light source unit and the projection unit. A projection device comprising: a power supply control unit that stops at least the constant supply of power to the light source unit when it is detected that the projection device is not stationary.
The power control unit
2. The projection according to claim 1, wherein when the state detection unit detects that the projection device is not in a stationary state, power is supplied to the light source unit only while the operation unit is continuously operated. apparatus.
The projection device according to claim 1, wherein the state detection unit includes a gyro sensor.
The projection device according to claim 1, wherein the state detection unit includes an acceleration sensor.
The projection device according to claim 1, wherein the state detection unit is provided on a bottom surface of the projection device, and includes a sensor that detects whether the projection device is placed on the installation unit with the bottom surface facing down.
2. The projection apparatus according to claim 1, wherein the state detection unit includes a touch sensor that detects that a user has touched.
When the power control unit stops supplying power to the light source unit and the projection unit,
The projection apparatus according to claim 1, wherein after the power supplied to the light source unit is stopped, the power supply to the projection unit is stopped.
The projection device according to claim 1, wherein the light source unit includes a laser diode that emits laser light.
A light source unit;
A projection unit for projecting light emitted from the light source unit;
An internal power supply that is disposed inside and supplies driving power to the light source unit and the projection unit;
An external connection unit for connecting to an external power source disposed outside and supplying driving power for the light source unit and the projection unit;
An operation unit that can be operated by the user for switching between start and end of projection;
An external power source detection unit for detecting whether or not the external power source is connected to the projection device;
When the connection to the external power source is detected by the external power source detection unit and the operation unit is operated, the power source unit and the projection unit are constantly supplied with power,
When the connection to the external power supply is not detected by the external power supply detection unit and the operation unit is not continuously operated, a power supply control unit that stops at least power supply to the light source unit And a projection apparatus comprising:
When the power control unit stops supplying power to the light source unit and the projection unit,
The projection apparatus according to claim 9, wherein the power supply to the projection unit is stopped after the power supplied to the light source unit is stopped.
The projection device according to claim 9, wherein the light source unit includes a laser diode that emits laser light.