JP2013190617A - Projector and control method of projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector which can prevent heat from being confined inside a shutter when the shutter is closed.SOLUTION: A projector is provided with shutter position detection means 15 for detecting which of an opening position and a closing position a shutter 4 of a projection lens 13 is at. When the shutter 4 is at the opening position, a switching plate 8 is brought into contact with wind guides 6A and 6B so as to close a space between them and guides all of air from a fan 24 to a vent 7. When the shutter 4 is at the closing position, the switching plate 8 is turned to open the space between the wind guides 6A and 6B and sends a part of air from the fan 24 to the vicinity of the projection lens 13, whereby the inside of the shutter is cooled.

Description

  The present invention relates to a projector and a projector control method.

2. Description of the Related Art Conventionally, in a presentation using a projector, a screen mute function that temporarily stops projecting an image is used, for example, when it is not desired to show an operating screen when switching to the next presentation. In this case, a projector capable of stopping image projection by projecting a black image or closing a sliding lens shutter is disclosed. When the lens shutter is closed, since the light source is lit, heat is generated inside the lens shutter, and there is a possibility that a malfunction may occur in the devices around the projection lens.
Patent Document 1 discloses a projector that prevents hot air from being blown by a vent hole opened in a lens cover.

JP 2009-3222 A

  However, in a projector such as Patent Document 1, it is difficult to release heat unless the vent hole has a certain size, and if it is too large, there is a problem that foreign matter enters when the lens cover is closed. .

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

  Application Example 1 A projector according to this application example modulates light emitted from a light source in accordance with image information and projects it onto a projection surface from a projection lens, a housing for housing these, A shutter that is provided in the housing and closes the projection lens, a shutter position detection unit that detects whether the shutter is in an open position or a closed position, and the housing A fan that cools the inside of the body and a fan control that blows the wind of the fan toward the periphery of the projection lens when it is detected that the shutter is in the closed position based on the detection result of the shutter position detecting means Means.

  According to this application example, when the shutter that closes the projection lens is closed to stop projecting the image, the fan wind is blown around the projection lens to cool it. Therefore, it is possible to prevent the temperature from rising. Also, when projecting an image with the shutter open, the fan wind is not blown around the projection lens, preventing the influence of the heated air convection around the projection lens on the projected image. it can.

  Application Example 2 In the projector according to the application example described above, it is preferable that the shutter includes a ventilation port that discharges the wind from the fan to the outside of the housing.

  According to this application example, when the shutter is closed and the fan wind is blown around the projection lens, the air inside the shutter is discharged to the outside of the housing from the ventilation opening provided in the shutter. Thus, it is possible to cool the periphery of the projection lens.

  Application Example 3 A projector control method according to this application example includes an image projection unit that modulates light emitted from a light source in accordance with image information and projects the light onto a projection surface from a projection lens, and a housing that accommodates the image projection unit. And a projector for closing the projection lens, and a fan for cooling the inside of the housing, wherein the shutter is in an open position and a closed position. The shutter position detecting step for detecting the position and the shutter position detecting step detects that the shutter is in the closed position, and blows the fan wind toward the periphery of the projection lens. A projector control method comprising: a fan control step;

  According to this application example, when the shutter that closes the projection lens is closed to stop projecting the image, the fan wind is blown around the projection lens to cool it. Therefore, it is possible to prevent the temperature from rising. Also, when projecting an image with the shutter open, the fan wind is not blown around the projection lens, preventing the influence of the heated air convection around the projection lens on the projected image. it can.

It is a perspective view of a projector, (a) shows a state when a shutter is in an open position, and (b) shows a shutter in a closed position. It is a top view of a projector, (a) shows a state when a shutter is an open position, (b) shows a shutter in a closed position. The block diagram which shows the circuit structure of a projector. The flowchart which shows operation | movement when a projector detects closure of a shutter during projection.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, the following embodiment does not limit the invention according to the scope of claims, and all combinations of features in the embodiment are based on the invention. It is not always essential to the solution.

(First embodiment)
FIG. 1 is a perspective view of the projector according to the present embodiment as viewed from the front. FIG. 1A shows a state when the shutter 4 is in the open position, and FIG. 1B shows a state when the shutter 4 is in the closed position. Show.
As shown in FIG. 1, the projector 1 has a configuration in which the apparatus main body is covered by a housing 2 having an upper surface 2t, a front surface 2f, and the like. In the present embodiment, the projector 1 will be described assuming that the front surface 2f direction, which is the projection direction, is the front.

The upper surface 2t of the housing 2 is provided with an input operation means 23 having a plurality of operation keys on which an input operation is performed by a user.
The front surface 2f of the housing 2 is formed with an exhaust port 7 for exhausting air inside the housing 2 and an opening 3, and inside the opening 3, image light is directed forward. A projection lens 13 for projecting is provided. The opening 3 is provided with a shutter 4 as a cover member that can be opened and closed. By closing the opening 3 with the shutter 4, the projection lens 13 can be protected and the projection light can be shielded. ing.

  The shutter 4 is a substantially rectangular plate made of synthetic resin, and an operation knob 4a for performing an opening / closing operation is integrally formed at one corner portion thereof. The operation knob 4 a is exposed from a slit 5 formed on the upper surface 2 t of the housing 2, and the shutter 4 can be opened and closed by sliding the operation knob 4 a left and right along the slit 5. . Further, the operation knob 4a protrudes upward from the upper surface 2t of the housing 2 to facilitate the sliding operation.

As shown in FIG. 1A, when the shutter 4 is in the open position, the shutter 4 opens the opening 3 and the projection lens 13 is exposed.
As shown in FIG. 1B, when the shutter 4 is in the closed position, the shutter 4 closes the opening 3. A ventilation port 4 b is provided at the lower part of the shutter 4, and the opening 3 is closed by the shutter 4 and the projection light from the projection lens 13 is blocked. Air can be discharged.

  In addition, a shutter position detecting means 15 configured by a photo sensor (not shown) that detects the position of the shutter 4 is disposed inside the housing 2 and adjacent to the shutter 4, and the shutter 4 is in the open position. Or in the closed position.

FIG. 2 is a plan view showing the opening / closing of the shutter 4 and the blowing state of the fan 24, and shows a state seen through from the upper surface 2 t of the housing 2. FIG. 2A shows a state when the shutter 4 is in the open position, and FIG. 2B shows a state when the shutter 4 is in the closed position. Note that FIG. 2 is simplified and does not represent all devices inside the housing 2.
As shown in FIG. 2, wall-shaped wind guides 6 </ b> A and 6 </ b> B for guiding the wind of the fan 24 to the exhaust port 7 are formed inside the housing 2. Between the wind guides 6A and 6B, a plate-shaped switching plate 8 for switching the wind of the fan 24 is provided. One end of the switching plate 8 is connected to one end of the shutter 4, and the switching plate 8 is interlocked with the opening / closing operation of the shutter 4 and rotates about the shaft 8 p.
As shown in FIG. 2A, when the shutter 4 is in the open position, the switching plate 8 is in contact with the air guides 6A and 6B so that all the air from the fan 24 is directed to the exhaust port 7. Lead.
As shown in FIG. 2B, when the shutter 4 is moved to the closed position, the switching plate 8 rotates to open the space between the wind guides 6A and 6B, and a part of the wind of the fan 24 is projected onto the projection lens 13. To the vicinity of

FIG. 3 is a block diagram illustrating a circuit configuration of the projector 1 according to the present embodiment.
As shown in FIG. 3, the projector 1 includes an image projection unit 10, a shutter position detection unit 15, an OSD processing unit 16, an image signal processing unit 17, an image signal input unit 18, a control unit 20, a storage unit 21, and a light source control unit. 22, an input operation means 23, a fan 24, a fan control means 25, a power supply terminal 30, a power supply unit 31, and the like, which are accommodated inside or outside the housing 2 (FIG. 1).

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

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

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

  In the present embodiment, the projector 1 that projects using the light source lamp 11a as the light source is exemplified. However, the present invention is also applicable to a projector that projects using a light emitting diode (LED) light source or a laser light source as the light source. Can do.

  In the present embodiment, the image projection unit 10 is exemplified by a transmissive liquid crystal type projection optical system using three liquid crystal light valves 12R, 12G, and 12B as light modulators. You may employ | adopt the light modulation apparatus of other display systems, such as a micromirror device system (light switch display system).

  The control means 20 includes a CPU (Central Processing Unit) (not shown), a RAM (Random Access Memory) used for temporary storage of various data, and the like, according to a control program (not shown) stored in the storage means 21. By operating, the overall operation of the projector 1 is controlled. That is, the control unit 20 functions as a computer together with the storage unit 21. In addition, the control unit 20 includes a timer 201 that measures time.

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

  The input operation means 23 includes a plurality of operation keys for the user to give various instructions to the projector 1. The operation keys provided in the input operation means 23 include a power key for alternately switching on / off the power, an input switching key for switching a plurality of image input terminals input to the image signal input means 18, and various settings. There are a menu key for superimposing a setting menu for performing, a cursor key for selecting a setting item from the menu, a determination key, an escape key, and the like.

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

  As described above, the image signal input means 18 includes a plurality of image input terminals, and image information is input from each image input terminal from an external device such as a video playback device or a personal computer via a cable (not shown). The Note that the image signal input unit 18 may include a receiving unit for wireless communication, optical communication, or the like, and input an image signal wirelessly from an external device.

  The image signal processing means 17 converts the image information input from the image signal input means 18 into image information representing the gradation of each pixel of the liquid crystal light valves 12R, 12G, and 12B. Here, the converted image information is for each of the R, G, and B color lights, and is composed of a plurality of pixel values corresponding to all the pixels of the liquid crystal light valves 12R, 12G, and 12B. The pixel value defines the light transmittance of the corresponding pixel, and the intensity (gradation) of light transmitted through each pixel and emitted is defined by this pixel value.

  The OSD processing unit 16 performs processing for superimposing and displaying an OSD (on-screen display) image such as a menu image or a message image on the projection image based on an instruction from the control unit 20. The OSD processing unit 16 includes an OSD memory (not shown), and stores OSD image information representing graphics, fonts, and the like for forming an OSD image.

  When the control unit 20 instructs to superimpose the OSD image, the OSD processing unit 16 reads necessary OSD image information from the OSD memory, and outputs an image signal so that the OSD image is superimposed at a predetermined position on the projected image. The OSD image information is synthesized with the image information input from the processing means 17. The image information combined with the OSD image information is output to the liquid crystal driving means 14. When there is no instruction to superimpose the OSD image from the control unit 20, the OSD processing unit 16 outputs the image information input from the image signal processing unit 17 to the liquid crystal driving unit 14 as it is.

  When the liquid crystal driving unit 14 drives the liquid crystal light valves 12R, 12G, and 12B according to the image information input from the OSD processing unit 16, the liquid crystal light valves 12R, 12G, and 12B form images corresponding to the image information, An image is projected from the projection lens 13.

  The light source control unit 22 controls supply and stop of power to the light source 11 based on an instruction from the control unit 20 and switches between turning on and off the light source 11.

  The shutter position detection means 15 includes a photo sensor, a magnetic sensor, a mechanical switch, and the like, and detects whether the position when the shutter 4 is slid with the operation knob 4a is in the open position or the closed position. The detection result is output to the control means 20.

  The fan control means 25 controls the start and stop of the rotational operation of the fan 24 based on the instruction of the control means 20, the air inside the housing 2 is discharged from the exhaust port 7 by the fan 24, and the shutter 4 When the lens is closed, air is blown to cool the vicinity of the projection lens 13.

The power supply unit 31 is supplied with electric power such as AC 100V from the outside via the power supply terminal 30. The power supply unit 31 converts input power (AC power) into predetermined DC power and supplies the power to each unit of the projector 1.
In addition, the power supply unit 31 stops supplying power (operating power) necessary for image projection to each unit (power-on state) and operating power supply based on an instruction from the control unit 20. It is possible to switch between a state (standby state) of waiting for an operation for turning on.

Next, the operation of the projector 1 of the present embodiment will be described using the flowchart of FIG. In the present embodiment, the fact that a predetermined image (mute image) is projected by the image projection means 10 to pause image projection is expressed as a mute state.

FIG. 4 is a flowchart showing the operation when the projector 1 detects that the shutter 4 has moved to the closed position during projection.
As shown in FIG. 4, when it is detected that the shutter 4 has moved to the closed position while the projector 1 is operating (step S101), the process proceeds to step S102. Step S101 and later-described step S105 correspond to a shutter position detection step.

  In step S102, the switching plate 8 rotates as described with reference to FIG. 2, and the air from the fan 24 starts to be blown to the vicinity of the projection lens 13 (step S102). Next, the process proceeds to step S103. Step S102 corresponds to a fan control step.

  In step S103, the control unit 20 causes the image projection unit 10 to project a predetermined mute image so that the projector 1 is muted, and the process proceeds to step S104.

  In step S104, the control means 20 starts measuring time by the timer 201, and proceeds to step S105.

  In step S105, the control means 20 checks whether or not the shutter 4 has moved to the open position. When the shutter 4 has moved to the open position (step S105: Y), the process proceeds to step S110. If the shutter 4 has not moved to the open position (step S105: N), the process proceeds to step S106.

  In step S106, the control means 20 checks whether or not the time measured by the timer 201 has passed a time T1 (for example, 5 minutes). When the timer 201 has passed the time T1 (step S106: Y), the process proceeds to step S107. When the timer 201 has not elapsed the time T1 (step S106: N), the process proceeds to step S105.

  In step S107, the control unit 20 causes the light source control unit 22 to turn off the light source 11, and the process proceeds to step S108.

  In step S108, the control means 20 turns off the power of the projector 1 to shift to the standby state, and ends this operation flow.

  In step S110, as described with reference to FIG. 2, the switching plate 8 rotates to end the blowing of air to the vicinity of the projection lens 13 by the fan 24, and the process proceeds to step S111.

  In step S111, the control means 20 stops timing by the timer 201, and proceeds to step S112.

  In step S112, the control unit 20 ends the mute state of the screen, causes the image projection unit 10 to project an image based on the image signal input to the image signal input unit 18, and proceeds to step S113.

  In step S113, the operation flow ends.

As described above, according to the projector 1 of the present embodiment, when the shutter 4 that closes the projection lens 13 is closed in order to pause image projection, the wind of the fan 24 is blown around the projection lens 13. Since cooling is performed, it is possible to prevent heat from being generated inside the shutter 4 and around the projection lens 13 to increase the temperature.
Further, when the shutter 4 is opened and an image is projected, the wind of the fan 24 is not blown around the projection lens 13, so that the projected image is generated by the convection of heated air around the projection lens 13. Can be prevented.
Further, when the shutter 4 is closed and the wind of the fan 24 is blown around the projection lens 13, the air inside the shutter 4 is exhausted to the outside of the housing 2 from the ventilation port 4 b provided in the shutter 4. Therefore, it becomes possible to cool the periphery of the projection lens 13 more effectively.

Moreover, you may change the said embodiment as follows.
(Modification 1)
In the above-described embodiment, the switching plate 8 interlocked with the shutter 4 is used to blow a part of the wind of the fan 24 around the projection lens 13 when the shutter 4 is closed. A dedicated fan for cooling the vicinity may be provided, and air may be blown when the closing of the shutter 4 is detected.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Housing | casing, 3 ... Opening part, 4 ... Shutter, 4a ... Operation knob, 4b ... Ventilation opening, 6A, 6B ... Wind guide, 7 ... Exhaust opening, 8 ... Switching board, 8p ... Shaft, 10 DESCRIPTION OF SYMBOLS Image projection means 11 ... Light source, 12R, 12G, 12B ... Liquid crystal light valve, 13 ... Projection lens, 14 ... Liquid crystal drive means, 15 ... Shutter position detection means, 16 ... OSD processing means, 17 ... Image signal processing means, DESCRIPTION OF SYMBOLS 18 ... Image signal input means, 20 ... Control means part, 21 ... Memory | storage means, 22 ... Light source control means, 23 ... Input operation means, 30 ... Power supply terminal, 31 ... Power supply part.

Claims (3)

A projector comprising: an image projection unit that modulates light emitted from a light source according to image information, and projects the light from a projection lens onto a projection surface; and a housing that accommodates the image projection unit.
A shutter provided in the housing and closing the projection lens;
Shutter position detection means for detecting whether the shutter is in an open position or a closed position;
A fan for cooling the inside of the housing;
Fan control means for blowing the wind of the fan toward the periphery of the projection lens when detecting that the shutter is in the closed position based on the detection result of the shutter position detection means;
A projector comprising: The projector according to claim 1,
The projector according to claim 1, wherein the shutter includes a vent hole for discharging the wind from the fan to the outside of the housing. An image projecting unit that modulates light emitted from the light source according to image information and projects the light onto a projection surface from the projection lens, a housing that accommodates the image projecting unit, and a housing that is provided in the housing and closes the projection lens A method of controlling a projector comprising a shutter and a fan for cooling the inside of the housing,
A shutter position detecting step for detecting whether the shutter is in an open position or a closed position;
A fan control step for blowing the wind of the fan toward the periphery of the projection lens when the shutter position detecting step detects that the shutter is in the closed position; and
A projector control method comprising the steps of:

Images