JP2018005164A - Projector and method for controlling projector - Google Patents

Abstract

Provided are a projector and a projector control method capable of reducing the possibility of occurrence of a malfunction by irradiating a light modulator with external light. A projector includes a light source that emits first light and a second light that is modulated from the first light based on image data input from an external device. Including an optical modulation unit 72, a projection lens, an image projection unit 73 that projects the second light using the projection lens, a lens position adjustment unit 121 that moves the projection lens, and the operating state of the projector 11 or external When at least one of the states of the image data input from the apparatus 5 satisfies a preset condition, the light modulation unit 72 causes the third light incident on the lens position adjustment unit 121 to be incident from the projection lens. And a control unit 103 that moves the projection lens to a position where no image is formed. [Selection] Figure 2

Description

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

  High power laser devices for production may be used in concert venues. Among them, a projector may be used. At that time, external light (laser light, etc.) incident from the projector's projection lens forms an image on the light modulation means (liquid crystal panel, DMD, etc.) and parts of the polarizing plate, etc., causing heat generation and causing failure of the projector. There was a risk of this.

  On the other hand, in an image projection apparatus using DMD, a shutter member is provided so as to face the light image incident surface of the projection lens, and the light shielding position where the shutter member faces the light image incident surface when the projector is turned off. (For example, refer patent document 1).

  In Patent Document 1, a shutter member is provided on the light image incident surface side of the projection lens, and the shutter member is moved to the retracted position when the light source is on, and the shutter member is moved to the light shielding position when the light source is off. As a result, even if laser light enters from the projection lens when the light source is turned off, the laser light is blocked by the shutter member, and damage to the image forming unit such as the DMD or its driving substrate is suppressed.

JP 2014-174314 A

  However, when a shutter member is provided between the projection lens and the image forming unit as in Patent Document 1, the distance (back focus) between the projection lens and the image forming unit is increased, so that more accurate projection is performed. A lens is required and the cost increases. Moreover, in order not to increase the back focus, it is necessary to reduce the adjustment width in the optical axis direction of the projection lens or to reduce the space for mounting the optical function. There is concern about the decline. Furthermore, even if the shutter member is provided on the light exit surface side of the projection lens, the number of parts of the projector increases, resulting in an increase in cost and a decrease in yield.

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

  Application Example 1 A projector according to this application example is a projector, and includes a light source that emits first light and a second light that modulates the first light based on image data input from an external device. A light modulation unit that emits the light, a projection lens, an image projection unit that projects the second light using the projection lens, a lens position adjustment unit that moves the projection lens, and the projector When at least one of the operating state or the state of the image data input from the external device meets a preset condition, the third light incident from the projection lens on the lens position adjustment unit is And a control unit that moves the projection lens to a position where no image is formed by the light modulation unit.

  According to this application example, when at least one of the operation state of the projector or the state of the image data input from an external device satisfies a preset condition, the third light incident from the projection lens is The projection lens can be moved to a position where no image is formed by the light modulator. As a result, no image can be formed on the light modulator. As a result, the third light is applied to the light modulation unit, thereby reducing the possibility of occurrence of a problem.

  Application Example 2 In the projector according to the application example described above, when the input of image data from the external device is stopped, the control unit transmits the third light to the lens position adjustment unit. It is preferable to move the projection lens to a position where no image is formed by the light modulator.

  According to this application example, when there is no image data input from an external device, the projection lens can be moved to a position where the third light is not imaged by the light modulation unit.

  Application Example 3 In the projector according to the application example described above, when the light modulation unit reduces the light amount to a predetermined light amount or less by the light modulation unit, the third light is transmitted to the lens position adjustment unit. Preferably, the projection lens is moved to a position where no image is formed by the light modulator.

  According to this application example, when the light is attenuated by the light modulator, the projection lens can be moved to a position where the third light is not imaged by the light modulator.

  Application Example 4 In the projector according to the application example described above, the projection lens when at least one of an operation state of the projector or a state of image data input from the external device satisfies a preset condition. It is preferable to further include a storage unit that stores lens position information representing the position of the lens, and the control unit controls the lens position adjustment unit based on the lens position information stored in the storage unit.

  According to this application example, after the projection lens moves to a position where the second light is not imaged by the light modulation unit, at least one of the operation state of the projector and the state of the image data input from the external device is The projection lens can be automatically moved to a position when a preset condition is met.

  Application Example 5 In the projector according to the application example described above, it is preferable that the projection lens is a zoom lens.

  According to this application example, the projection lens can be moved to a position where no image is formed on the light modulation unit.

  Application Example 6 In the projector according to the application example described above, the position of the zoom lens in which the second light is not imaged by the light modulation unit is closer to the light modulation unit than the tele end of the zoom lens. It is preferable.

  According to this application example, it is possible to ensure the lens performance of the wide, tele, and non-imaging positions.

  Application Example 7 In the projector according to the application example described above, the position of the zoom lens in which the second light is not imaged by the light modulation unit is farther from the light modulation unit than the wide end of the zoom lens. It is preferable.

  According to this application example, it is possible to secure the lens performance of the non-imaging position, wide, and tele.

  Application Example 8 A projector control method according to this application example includes a light source that emits first light and second light obtained by modulating the first light based on image data input from an external device. Control of a projector including a light modulation unit that emits light, an image projection unit that projects the second light using the projection lens, and a lens position adjustment unit that moves the projection lens In the method, the lens position adjustment unit is configured to start from the projection lens when at least one of an operation state of the projector or a state of image data input from the external device satisfies a preset condition. The projection lens is moved to a position where the incident third light is not imaged by the light modulator.

  According to this application example, when at least one of the operation state of the projector or the state of the image data input from an external device satisfies a preset condition, the third light incident from the projection lens is The projection lens can be moved to a position where no image is formed by the light modulator. As a result, no image can be formed on the light modulator. As a result, the third light is applied to the light modulation unit, thereby reducing the possibility of occurrence of a problem.

The principal part top view which shows the structure of the projection part with which the projector which concerns on this embodiment is provided. The block diagram which shows the functional structure of the projection system containing an image supply apparatus and a projector. Sectional drawing which shows a zoom lens. Sectional drawing which shows the zoom lens of a wide end state. Sectional drawing which shows the zoom lens of a tele end state. FIG. 6 is a flowchart illustrating a projector control method according to the present embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings. Note that the drawings to be used are appropriately enlarged or reduced so that the part to be described can be recognized.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a main part plan view showing a configuration of a projection unit included in the projector according to the present embodiment.
As shown in FIG. 1, the projector 11 according to the present embodiment includes a lamp 2 as a light source. Light (first light) emitted from the lamp 2 is modulated by a liquid crystal light valve 79 and screen SC ( 2). The lamp 2 is composed of a high-intensity lamp such as a metal halide lamp or a high-pressure mercury lamp, for example, and includes light Lw including red light Lr, green light Lg, and blue light Lb shown in the figure (hereinafter, these lights are not distinguished from each other). (Sometimes referred to as “light L”).

  The projector 11 includes a pair of lens arrays 61a and 61b, a superimposing lens 62, liquid crystal light valves 79r, 79g and 79b (hereinafter also referred to as “liquid crystal light valve 79” when not distinguished), dichroic mirrors 74r and 74b, and reflection mirrors 75a to 75a. 75d, a relay lens 76, a prism 77, and a projection lens 6. The lens array 61a functions as a light beam splitting optical element that splits the light beam from the lamp 2 into a plurality of partial lights, and is arranged in a matrix at a predetermined pitch (array pitch) P in a plane orthogonal to the illumination optical axis. A plurality of optical elements (not shown) are arranged. The lens array 61b is an optical element that adjusts the divergence angles of a plurality of partial light beams divided by the lens array 61a. Similar to the lens array 61a, the lens array 61b has a plurality of arrays arranged in a matrix in a plane orthogonal to the illumination optical axis. An optical element (not shown) is provided.

  The superimposing lens 62 condenses a plurality of partial light beams that have passed through the pair of lens arrays 61 a and 61 b and superimposes them on the image forming area of the liquid crystal light valve 79.

  The liquid crystal light valves 79r, 79g, and 79b are driven by a light modulation device driving unit 119, which will be described later, to display an image and transmit the red light Lr, the green light Lg, and the blue light Lb based on the image data. Each color light Lr, Lg, Lb is modulated, and the modulated light (second light) is emitted to the prism 77. The dichroic mirrors 74 r and 74 b, the reflection mirrors 75 a to 75 d, and the relay lens 76 are disposed in the optical path of the light L and cause the light L to enter each liquid crystal light valve 79. In this case, the dichroic mirror 74r transmits the red light Lr and reflects the green light Lg and the blue light Lb. The dichroic mirror 74b transmits the blue light Lb and reflects the green light Lg. Further, the reflection mirrors 75a to 75d reflect the light L (total reflection). Therefore, only the red light Lr of the light Lw is incident on the liquid crystal light valve 79r, only the green light Lg of the light Lw is incident on the liquid crystal light valve 79g, and the light Lw of the light Lw is incident on the liquid crystal light valve 79b. Only blue light Lb is incident. The prism 77 combines the red light Lr, the green light Lg, and the blue light Lb modulated by the liquid crystal light valves 79r, 79g, and 79b. The projection lens 6 enlarges the light synthesized by the prism 77 (projection light Lp) and projects it onto the screen SC.

FIG. 2 is a block diagram illustrating a functional configuration of the projection system 10 including the image supply device 5 and the projector 11.
The projector 11 is connected to an external image supply device (not shown) such as a personal computer or various image players via an I / F (interface) 101, and images input from these image supply devices (external devices). Is projected onto the screen SC. The I / F 101 is, for example, a USB interface, a wired or wireless LAN interface, a VGA terminal to which an analog video signal is input, a DVI (Digital Visual Interface) to which a digital video signal is input, a composite video signal such as NTSC, PAL, or SECAM. Input S video terminal, composite video signal input RCA terminal, component video signal input D terminal, HDMI (registered trademark) standard HDMI connector, etc. via the above terminals and connectors An interface circuit for inputting and outputting signals. Examples of the image supply device include a video playback device, a DVD playback device, a TV tuner device, a CATV set top box, an image output device such as a video game device, and a PC (Personal Computer).

  The projector 11 can display either a still image or a moving image (video). Further, the screen SC is, for example, a rectangular screen that is installed almost upright. In addition to a screen for a projector, the wall surface may be a screen SC.

  In addition, the projector 11 includes an external device I / F 88 connected to the image supply device 5 as an external device. The external device I / F 88 is provided as an interface dedicated to the image supply device 5, and has a dedicated connector compatible with the external I / F 59 provided in the image supply device 5. When image data is input from the image supply device 5 to the external device I / F 88, the control unit 103 acquires the input image data by the functions of the input image detection unit 103A and the display control unit 103B described later, Similarly to the image data input from the I / F 101, image processing is performed by the image processing unit 107, and an image based on this image data is projected on the screen SC by the projection unit 3.

  The image supply device 5 is configured as, for example, a portable media player, and has a function of supplying an image stored therein and an image acquired by the image supply device 5 from an external device to the projector 11. As a specific example, the image supply device 5 may have a mobile phone function in addition to an audio / video player.

  The image supply device 5 includes a CPU that executes a predetermined program to control each unit of the image supply device 5, a ROM that stores a basic control program executed by the CPU, data related to the basic control program, and the like, and a CPU A control unit 91 having a RAM and the like for temporarily storing programs executed by the computer, a storage unit 92 for storing application programs executed by the control unit 91, and various screens according to the control of the control unit 91 56, a display unit 57 that is displayed on the display unit 56, a switch unit 54 that is provided on the main body of the image supply device 5, and a touch screen 55 that is arranged on the surface of the display panel 56 to detect a touch operation. An operation detection unit 53 that detects an input operation to the switch unit 54 and the touch screen 55, and a control unit 91 A wireless communication unit 58 that transmits and receives various data to and from other personal computers and external devices such as the projector 11 via a wireless communication line, and an external I / O that outputs digital image data to the projector 11 F59, and these units are connected to each other via a bus.

  The image supply device 5 starts to operate according to the operation detected by the operation detection unit 53, executes the application program specified by this operation, and stores the image stored in the storage unit 92 by the function of the image viewer program, for example. Data 92B is reproduced and displayed. Here, the image supply device 5 displays the image data 92 </ b> B, which is a moving image or a still image, on the display panel 56 by the function of the display unit 57, and is the same as the screen displayed on the display panel 56. Image data for displaying the screen is transmitted to the projector 11.

  The image supply device 5 can also transmit image data and control information to the projector 11 by the wireless communication unit 58. In this embodiment, an example in which image data is output from the external I / F 59 will be described. The storage unit 92 stores various data such as a control program 92A executed by the control unit 91 and image data 92B processed by the image supply device 5 in a manner that can be read by the CPU of the control unit 91. Furthermore, when the image supply device 5 has a still image or moving image shooting function, the storage unit 92 may store the captured image data.

  The image supply device 5 executes a control program 92A stored in the storage unit 92, thereby outputting an image output unit 91A that outputs an image to the projector 11, and a communication control unit 91B that controls communication with an external device. It functions as a display control unit 91C that controls display on the display panel 56. After detecting that the image output unit 91A is connected to the projector 11 via the external I / F 59, the image output unit 92A selects image data 92B selected by the operation of the operation detection unit 53 or the communication control unit 91B from an external device. Data for displaying the acquired image data is generated and output to the projector 11 via the external I / F 59. Here, the image output unit 91A can also execute processing for adjusting or converting the resolution, frame rate, color tone, data format, and the like of the image data 92B or the image data acquired from the external device according to the projector 11. is there. When the image output unit 91A detects that the external I / F 59 has been removed from the projector 11, the image output unit 91A stops outputting data from the external I / F 59.

  The projector 11 is roughly composed of a projection unit 3 that forms an optical image and an image processing system that electrically processes a display signal input to the projection unit 3. The projection unit 3 includes an illumination device 71, a light modulation device 72 as a light modulation unit, and a projection optical system 73 as an image projection unit. The illumination device 71 includes the lamp 2 as a light source. As the light source provided in the illumination device 71, in addition to the lamp 2, an LED (Light Emitting Diode) or the like can be used. The illuminating device 71 includes the pair of lens arrays 61 a and 61 b and the superimposing lens 62 in addition to the lamp 2. The lighting device 71 includes a cooling fan 65 that cools the lamp 2 by blowing outside air onto the lamp 2. The cooling fan 65 may be installed in the vicinity of the lamp 2, or may be provided at a position communicating with the air passage when an air passage for blowing air to the lamp 2 is formed. Further, the cooling fan 65 may be arranged so as to blow air also to a power supply circuit unit (not shown) that supplies power to each unit including the lamp 2.

  A cooling fan driving unit 118 that supplies a driving current to the cooling fan 65 is connected to the cooling fan 65, and the cooling fan 65 rotates at a rotation speed corresponding to the driving current. The cooling fan drive unit 118 can switch the rotational speed of the cooling fan 65 to at least two stages by controlling the drive current supplied to the cooling fan 65. The lamp 2 is connected to a light source driving unit 117 that controls the lighting of the lamp 2, and the light source driving unit 117 turns on / off the lamp 2 according to the control of the control unit 103.

  The light modulation device 72 modulates the light emitted from the illumination device 71 based on the image data input from the image supply device 5 and emits the modulated light. The light modulation device 72 has a configuration for modulating the light emitted from the illumination device 71, and includes a liquid crystal light valve 79 composed of three liquid crystal panels corresponding to the three primary colors of RGB, as shown in FIG. The modulated light modulated by the liquid crystal light valve 79 is emitted to the projection optical system 73. The configuration in which the light modulation device 72 modulates light is not limited to the configuration of the liquid crystal light valve 79 using three transmissive liquid crystal panels, and for example, three reflective liquid crystal panels can be used. It is also possible to configure with a method that combines one liquid crystal panel and a color wheel, a method that uses three digital mirror devices (DMD), and a method that combines one digital mirror device and a color wheel. is there. When the light modulator 72 uses only one liquid crystal panel or DMD, members corresponding to the combining optical system such as the dichroic mirrors 74r and 74b and the prism 77 shown in FIG. 1 are unnecessary. In addition to the liquid crystal panel and the DMD, any configuration that can modulate the light emitted from the light source can be used without any problem.

  The projection optical system 73 includes the projection lens 6 and projects the projection light Lp via the projection lens 6. The projection optical system 73 includes a projection lens 6 (FIG. 1) that performs enlargement / reduction of a projected image and adjustment of the focus, a zoom motor 50 (FIG. 3) that drives the projection lens to adjust the degree of zoom, and a focus. And a focus adjustment motor (not shown). The projection optical system 73 projects the light modulated by the light modulator 72 onto the screen SC (display surface) using the projection lens 6 to form an image. The projection optical system 73 is connected to a projection optical system drive unit 121 that drives each motor included in the projection optical system 73 according to the control of the control unit 103.

  The projector 11 includes a projection optical system driving unit 121 that moves the first to third lens groups 23 to 25 (FIG. 3) constituting the projection lens 6. When at least one of the operation state of the projector 11 and the state of the image data input from the image supply device 5 meets a preset condition, the control unit 103 causes the projection optical system driving unit 121 to transmit the projection lens 6. The first to third lens groups 23 to 25 are moved to a position where the light Lo (FIG. 1, third light) incident on the light modulation device 72 does not form an image. At this time, when the projection lens 6 is composed of a plurality of lenses (for example, the first to third lens groups 23 to 25), the light Lo incident from the projection lens 6 is not imaged by the light modulator 72. If there is, it is not necessary to move all the lenses constituting the projection lens 6 (for example, all of the first to third lens groups 23 to 25), and at least one lens among the plurality of lenses constituting the projection lens 6 is present. Should be moved.

  When the input of the image data from the image supply device 5 is stopped, the control unit 103 causes the first to third lenses to be placed on the projection optical system driving unit 121 at a position where the light Lo is not imaged by the light modulation device 72. The groups 23 to 25 are moved. According to this, when there is no image data input from the image supply device 5, the first to third lens groups 23 to 25 can be moved to a position where the light Lo is not imaged by the light modulation device 72.

When the light modulation device 72 reduces the light amount to a predetermined light amount or less, the control unit 103 causes the light Lo to be projected to the projection optical system drive unit 121 at a position where the light modulation device 72 does not form an image. The three lens groups 23 to 25 are moved. According to this, the first to third lens groups 23 to 25 can be moved to a position where the light Lo is not imaged by the light modulation device 72 when it is dimmed by the light modulation device 72.
Further, when the lamp 2 is turned off, the control unit 103 moves the first to third lens groups 23 to 25 to a position where the light Lo is not imaged by the light modulation device 72 in the projection optical system driving unit 121. Let Alternatively, when the luminance of the lamp 2 becomes smaller than a predetermined threshold, the control unit 103 causes the projection optical system driving unit 121 to place the light Lo at a position where the light modulation device 72 does not form an image. The three lens groups 23 to 25 may be moved.

  The image processing system is configured around a control unit 103 that controls the entire projector 11 in an integrated manner. The storage unit 105 stores the data processed by the control unit 103 and the control program 105A executed by the control unit 103, and the operation panel 85. And an input processing unit 123 that detects an operation via the remote control light receiving unit 81, an image processing unit 107 that processes image data input to the I / F 101, and a display signal output from the image processing unit 107. An optical modulator driving unit 119 for driving the liquid crystal light valve 79 of the optical modulator 72 is provided.

  The control unit 103 reads out and executes the control program 105 </ b> A stored in the storage unit 105, thereby controlling each unit of the projector 11. The control unit 103 detects the content of the operation performed by the user based on the operation signal input from the input processing unit 123, and in response to this operation, the image processing unit 107, the light source driving unit 117, and the cooling fan driving unit 118. The light modulator driving unit 119 and the projection optical system driving unit 121 are controlled to project an image on the screen SC.

  The storage unit 105 stores the first to third lens groups 23 to 25 when at least one of the operation state of the projector 11 and the state of the image data input from the image supply device 5 satisfies a preset condition. First lens position information 105B representing the position to move is stored.

The control unit 103 stores the first lens position stored in the storage unit 105 when at least one of the operation state of the projector 11 and the state of the image data input from the image supply device 5 satisfies a preset condition. Based on the information 105B, the projection optical system driving unit 121 is controlled.
The storage unit 105 also includes first to third lens groups 23 to 25 when at least one of an operation state of the projector 11 and a state of image data input from the image supply device 5 satisfies a preset condition. The second lens position information 105C representing the position of is stored. According to this, the first to third lens groups 23 to 25 are located at positions when at least one of the operation state of the projector 11 or the state of the image data input from the image supply device 5 meets a preset condition. Can be moved automatically.

  In the main body of the projector 11, an operation panel 85 including various switches and indicator lamps for operation by a user is disposed. The operation panel 85 is connected to the input processing unit 123, and the input processing unit 123 appropriately lights or blinks the indicator lamp of the operation panel 85 according to the operation state and setting state of the projector 11 according to the control of the control unit 103. . When the switch of the operation panel 85 is operated, an operation signal corresponding to the operated switch is output from the input processing unit 123 to the control unit 103.

  The projector 11 has a remote controller (not shown) used by the user. The remote control includes various buttons, and transmits an infrared signal corresponding to the operation of these buttons. In the main body of the projector 11, a remote control light receiving unit 81 that receives an infrared signal emitted from the remote control is disposed. The remote control light receiving unit 81 decodes the infrared signal received from the remote control, generates an operation signal indicating the operation content on the remote control, and outputs the operation signal to the control unit 103.

  The control unit 103 includes an input image detection unit 103A that detects the state of image data input via the I / F 101 or the external device I / F 88, and image data input from the I / F 101 or the external device I / F 88. A display control unit 103B that obtains and controls the image processing unit 107, the light source driving unit 117, the light modulation device driving unit 119, and the projection optical system driving unit 121 to project an image based on the acquired image data. ing.

  The image processing unit 107 generates a display signal based on the image data input via the I / F 101 or the external device I / F 88 according to the control of the control unit 103, and outputs the display signal to the light modulation device driving unit 119. The light modulation device driving unit 119 drives the light modulation device 72 based on the display signal input from the image processing unit 107. As a result, the digital image data input from the image supply device 5 is processed by the image processing unit 107, and the light L is modulated into image light by the light modulation device 72 driven based on the processed image data. Light is projected as a projected image on the screen SC via the projection optical system 73.

  Further, the control unit 103 detects an operation of an AV mute key (not shown) included in a remote controller (not shown) by the remote control light receiving unit 81 and an operation of an AV mute key (not shown) provided in the operation panel 85. When detected, it has an AV mute function that stops projecting an image on the screen SC. When this AV mute function is executed, the control unit 103 controls the image processing unit 107 to control a display signal output to the light modulation device driving unit 119 so that a black image is projected. For this reason, the light emitted from the illuminating device 71 is substantially blocked by the liquid crystal light valve 79, the amount of light emitted from the liquid crystal light valve 79 becomes less than a predetermined amount, and nothing appears on the screen SC. . When a release operation such as pressing the AV mute key again is performed, the control unit 103 stops the AV mute function and returns to the normal image projection state.

  Here, as a condition in which at least one of the operation state of the projector 11 and the state of the image data input from the image supply device 5 is set in advance, the input image data from the image supply device 5 acquired by the display control unit 103B. When the input is stopped, when the AV mute is executed and the light modulation device 72 reduces the light amount to a predetermined light amount or less, the light Lo incident from the projection lens 6 does not form an image on the light modulation device 72. The first to third lens groups 23 to 25 are moved.

FIG. 3 is a cross-sectional view showing the zoom lens 6. FIG. 4 is a cross-sectional view showing the zoom lens 6 in a state where the zoom lens 6 is positioned at the wide end. FIG. 5 is a cross-sectional view showing the zoom lens 6 in a state where the zoom lens 6 is located at the telephoto end. FIG. 6 is a development view of the cam cylinder 22.
Conventional projection lenses have adjustment mechanisms such as focus, zoom, and distortion. Generally, by rotating a ring mechanism on the outer periphery of the lens, the lens group in the projection lens is moved to the design position along the cam. In this embodiment, one of those rings is further rotated to move the projection lens to a lens group position where no image is formed (resolved). A state where no image is formed on the projection optical system 73 is created (a non-imaged position) (a state where no image is formed: a state where the lens does not function as a projection lens, and can be realized by arranging the lens group at an appropriate position). .

  The projection lens 6 is a zoom lens. According to this, the first to third lens groups 23 to 25 can be moved to positions where no image is formed on the light modulation device 72 at all.

  As shown in FIGS. 3 to 5, the zoom lens 6 includes a rectilinear barrel 21, a cam barrel 22, and first to fourth lens groups 23 to 26 arranged in this order from the screen SC side. The first to third lens groups 23 to 25 are held by the first to third moving frames 30 to 32, respectively. Reference numeral 2 denotes a lamp, reference numeral 79 denotes a liquid crystal light valve, and reference numeral 77 denotes a prism.

  The cam cylinder 22 rotates to a zoom range between the tele end and the wide end and to a non-imaging position that exceeds the zoom range. When the cam cylinder 22 is rotated from the non-image formation position toward the zoom range, the first to third lens groups 23 to 25 are moved from the storage position retracted most from the screen SC to the protrusion position protruding most toward the screen SC. Move.

  When the cam barrel 22 is rotated within the zoom range, the second and third lens groups 24 and 25 are moved in the direction of the optical axis 6a so as to change their mutual distance, thereby performing zooming. Focusing is a front group extension system in which the first lens group 23 is moved in the direction of the optical axis 6a with respect to the first moving frame 30.

  In the straight cylinder 21, a flange 21 a provided on the outer peripheral rear end side is fixed to a head plate (not shown) of the projector 11. The cam cylinder 22 is rotatably supported by the rectilinear cylinder 21 on the outer side. The rectilinear cylinder 21 incorporates first to third moving frames 30 to 32 so as to be movable in the direction of the optical axis 6a. A holding frame 33 is coupled to the inside of the first moving frame 30 by a helicoid 33a. The holding frame 33 holds the first lens group 23, and rotates around the optical axis 6a so that the first lens group 23 moves in the direction of the optical axis 6a with respect to the first moving frame 30 according to the lead of the helicoid 33a. Move to. The second and third moving frames 31 and 32 hold the second and third lens groups 24 and 25. The fourth lens group 26 is fixed to the rectilinear cylinder 21.

  Cam pins 35 to 37 are provided in the first to third moving frames 30 to 32, respectively. Each of the cam pins 35 to 37 is provided at three circumferentially divided positions around the optical axis 6a. These cam pins 35 to 37 are engaged with first to third cams 38 to 40 provided on the cam cylinder 22, respectively. There are also three first to third cams 38 to 40 in the circumferential direction. The rectilinear cylinder 21 is provided with rectilinear guide openings 42 at three circumferential positions. The rectilinear guide opening 42 is formed in parallel with the optical axis 6a.

  The cam pins 35 to 37 are also engaged with the rectilinear guide openings 42, respectively. The rectilinear guide openings 42 allow the first to third moving frames 30 to 32 to move in the direction of the optical axis 6a, and stop these rotations. The rectilinear guide opening 42, the cam pins 35 to 37, and the first to third cams 38 to 40 constitute first to third moving frame guide means for guiding the first to third moving frames 30 to 32. The cam cylinders 35 to 37 are guided to the intersections of the cams 38 to 40 and the straight guide opening 42 by the rotation of the cam cylinder 22, thereby moving the first to third moving frames 30 to 32 along the direction of the optical axis 6 a. Let me.

  As shown in FIG. 6, the second cam 39 includes a second non-imaging area guide cam 41 corresponding to the rotation of the cam cylinder 22 outside the zoom area, and a second variable magnification corresponding to the rotation within the zoom area. The cam 43 is connected. The second non-imaging area guide cam 41 is a spiral that extends the second moving frame 31 so that the second lens group 24 is located at the wide end on the zoom locus from the retracted position most retracted from the screen SC side. It is a trajectory. The second zoom cam 43 has a spiral trajectory that causes the second moving frame 31 to advance and retreat along the direction of the optical axis 6a so that the second lens group 24 moves along the zoom locus. Yes.

  The third cam 40 has a configuration in which a third non-imaging area guide cam 44 corresponding to the rotation of the cam barrel 22 outside the zoom range and a third zooming cam 45 corresponding to the rotation within the zoom range are connected. It has become. The third non-imaging area guide cam 44 is a spiral that extends the third moving frame 32 so that the third lens group 25 is positioned at the wide end of the zoom locus from the retracted position most retracted from the screen SC. It has become a trajectory. The third zooming cam 45 has a spiral trajectory for moving the third moving frame 32 back and forth along the direction of the optical axis 6a so that the third lens group 25 moves along the zooming trajectory. Yes.

  The first cam 38 has a configuration in which a first non-imaging area guide cam 47 corresponding to rotation of the cam cylinder 22 outside the zoom range and a movement prevention cam 48 corresponding to rotation within the zoom range are connected. ing. The first non-imaging area guide cam 47 is a spiral that moves the first moving frame 30 between a storage position that is most retracted from the screen SC and a protruding position that protrudes toward the screen SC. It has become a trajectory. The movement-preventing cam 48 has an arcuate locus that is not displaced in the direction of the optical axis 6a and is displaced in the rotational direction around the optical axis 6a, and the cam cylinder 22 rotates within the zoom range. The first moving frame 30 is held at the protruding position within the range.

Next, the operation of the above configuration will be briefly described.
In the non-imaging position state of the projector 11, as shown in FIG. 3, the first lens group 23, the holding frame 33, and the first moving frame 30 are housed inside the cam barrel 22. In order to enter the use state, for example, a zoom operation or a power-on operation is performed from the outside. In response to this operation, the control unit 103 of the projector 11 controls the projection optical system drive unit 121, and the projection optical system drive unit 121 drives the zoom motor 50. The drive of the zoom motor 50 is transmitted to the gear portion 52 formed on the outer periphery of the cam cylinder 22 via the gear train 51.

  The cam cylinder 22 is rotated in one direction around the optical axis 6a on the outer periphery of the rectilinear cylinder 21 by the drive being transmitted. This direction is the upward direction in FIG. When the cam cylinder 22 rotates, the first moving frame 30 moves from the storage position to the protruding position, and the second and third moving frames 31 and 32 cooperate with the first to third cams 38 to 40 and the rectilinear guide opening 42. Are extended from the respective storage positions to the wide position of the zooming locus, and as shown in FIG. 4, the focal length of the zoom lens 6 becomes the wide end. In this state, the first lens group 23 and the holding frame 33 protrude from the cam barrel 22 toward the screen SC. Thereafter, by performing a zoom operation, the cam cylinder 22 is rotated within the zoom range, and an arbitrary magnification position between the wide end and the tele end shown in FIG. 5 is selected.

  After zooming, focusing is performed manually while viewing the image projected on the screen SC. Focusing is performed by rotating a focus ring 33 b provided on the holding frame 33. Since the focus ring 33b protrudes from the outside of the cam cylinder 22 within the zoom range, it is easy to operate. When the focus ring 33b is rotated, the first lens group 23 moves in the direction of the optical axis 6a according to the lead of the helicoid 33a with respect to the first moving frame 30, and the focus of the zoom lens 6 is adjusted. At this time, the rotation of the focus ring 33b is transmitted to the first moving frame 30 by the resistance of the coupling portion of the helicoid 33a, and the cam pin 35 of the first moving frame 30 moves the movement preventing cam 48 of the first cam 38 to the optical axis. Energize in the direction of 6a. However, the movement preventing cam 48 of the present embodiment has a range corresponding to the rotation of the cam cylinder 22 in the zoom range formed in an arc shape along the direction perpendicular to the optical axis 6a. Even if the cam 48 is urged in the direction of the optical axis 6a, the cam barrel 22 does not rotate. Therefore, the movement in the direction of the optical axis 6a is prevented while the first moving frame 30 is held at the protruding position. Therefore, the zoom position of the zoom lens 6 does not change.

  In the present embodiment, the position of the zoom lens 6 where the light Lo is not imaged by the light modulation device 72 is closer to the light modulation device 72 than the tele end of the zoom lens 6. According to this, it is possible to secure the lens performance in which the wide, tele, and non-imaging positions are arranged.

(Projector control method)
FIG. 7 is a flowchart illustrating a method for controlling the projector 11 according to the present embodiment. Hereinafter, a control method of the projector 11 will be described with reference to FIG.

  As shown in FIG. 7, first, in step S10, the power supply of the projector 11 is turned on.

  Next, in step S <b> 15, the control unit 103 reads the second lens position information 105 </ b> C from the storage unit 105.

  Next, in step S20, the control unit 103 controls the projection optical system driving unit 121 to move the first to third lens groups 23 to 25 to a position stored in the second lens position information 105C. . Specifically, when the power is turned on, the lens group position before the power is turned off is automatically restored.

  Next, in step S <b> 25, the control unit 103 acquires the operating state of the projector 11 or the state of the image data input from the image supply device 5 while the projector 11 is in the normal operating state.

  Next, in step S <b> 30, the control unit 103 determines whether at least one of the operation state of the projector 11 or the state of the image data input from the image supply device 5 satisfies a preset condition. In No, it returns to step S25. In the case of Yes, it progresses to step S35.

  Next, in step S <b> 35, the control unit 103 stores the current second lens position information 105 </ b> C of the first to third lens groups 23 to 25 in the storage unit 105.

  Next, in step S40, the control unit 103 controls the projection optical system driving unit 121 to position the first to third lens groups 23 to 25 in the first lens position information 105B (non-image formation). Move to (position).

  The projection optical system drive unit 121 receives the light Lo incident from the zoom lens 6 when at least one of the operation state of the projector 11 and the state of the image data input from the image supply device 5 meets a preset condition. However, the first to third lens groups 23 to 25 are moved to positions where the light modulator 72 does not form an image.

  Next, in step S45, the control unit 103 determines whether the power is turned off. In No, it progresses to Step S50. In the case of Yes, it progresses to step S60.

  Next, in step S <b> 50, the control unit 103 acquires the operation state of the projector 11 or the state of image data input from the image supply device 5.

  Next, in step S55, the control unit 103 determines whether at least one of the operating state of the projector 11 or the state of the image data input from the image supply device 5 satisfies a preset condition. In No, it progresses to step S15. If yes, the process returns to step S50.

  Next, in step S60, the control unit 103 turns off the power of the projector 11. In the power-off state, the first to third lens groups 23 to 25 of the zoom lens 6 are moved to the non-imaging position so that the liquid crystal panel does not break down even when external laser light enters.

  According to this, external laser light is imaged on the light modulation device 72 in the wide and tele positions, energy is concentrated, and damage to the light modulation device 72 is large. On the other hand, at the position of the non-imaging position, the light Lo is greatly blurred by the light modulator 72, so that damage to the light modulator 72 can be greatly reduced. The non-imaging position is not limited to defocusing, and may include a state where the image is not resolved in the first place.

  Note that, as software control of different viewpoints, it is preferable to perform control so that the user operation during normal operation of the projector 11 can operate only between the wide end and the tele end.

  According to the present embodiment, when at least one of the operating state of the projector 11 or the state of the image data input from the image supply device 5 satisfies a preset condition, the light Lo incident from the projection lens 6 is detected. The first to third lens groups 23 to 25 can be moved to positions where no image is formed by the light modulator 72. As a result, no image can be formed on the light modulation device 72. As a result, the light Lo is irradiated onto the light modulation device 72, thereby reducing the possibility of occurrence of a malfunction.

  Further, as compared with the conventional case where a mechanical shutter or the like is provided in the back focus, there is an effect that the cooling performance and the contrast performance due to the compensation element are not lowered. Further, it is not necessary to provide a mechanical shutter member or the like separately. Further, since no components are arranged in the back focus with respect to the conventional mechanical shutter configuration, it is not necessary to sacrifice other performance and functions. In addition, by shortening the back focus of the new lens, it is possible to reduce the design and manufacturing difficulty of the projection lens and reduce the cost. In addition, the number of parts for the mechanical shutter can be reduced. In addition, in this embodiment, since the adjustment mechanism cam of the existing projection lens is extended, it is only necessary to slightly modify the existing lens, and it is necessary to create a completely new lens at a large cost. Absent.

(Second Embodiment)
The projector 11 of the present embodiment is different from the first embodiment in that the fourth lens group 26 of the zoom lens 6 is moved. Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified here. The zoom lens 6 of the present embodiment is an example constituted by a four-group lens as in the first embodiment.

  The projector 11 according to the present embodiment protects at least the operation state of the projector 11 or the state of the image data input from the image supply device 5 in order to protect the components inside the projector 11 from the light Lo from the outside of the projector 11. A mechanism and an operation for automatically moving the fourth lens group 26 of the zoom lens 6 to prevent image formation on the internal parts when any one of the conditions meets a preset condition are provided.

  Specifically, the projector 11 automatically moves the fourth lens group 26 of the zoom lens 6 when the power is turned off to protect the light modulation device 72 of the projector 11 from light Lo from the outside of the projector 11, A mechanism and operation for preventing image formation by the modulator 72 are provided.

  According to the present embodiment, when at least one of the operating state of the projector 11 or the state of the image data input from the image supply device 5 satisfies a preset condition, the light Lo incident from the projection lens 6 is detected. The fourth lens group 26 can be moved to a position where the light modulator 72 does not form an image. As a result, no image can be formed on the light modulation device 72. As a result, the light Lo is irradiated onto the light modulation device 72, thereby reducing the possibility of occurrence of a malfunction.

(Modification)
The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

  In the above-described embodiment, the position of the zoom lens 6 where the light Lo is not imaged by the light modulation device 72 is not limited to the case where the light Lo is closer to the light modulation device 72 than the tele end of the zoom lens 6. The position of the zoom lens 6 that is not imaged by the light modulation device 72 may be farther from the light modulation device 72 than the wide end of the zoom lens 6. According to this, it is possible to secure the lens performance of the non-imaging position, wide and tele.

  The zoom lens 6 of the above-described embodiment is configured to include the four lens groups of the first to fourth lens groups 23 to 26. However, the zoom lens 6 may be configured of a number of lens groups other than this.

  In addition to the projector 11, the projection lens 6 of the above-described embodiment can be applied to a single-lens reflex camera, a video camera, an electronic camera, an optical device for medical equipment, and the like that have an optical image scaling function. .

  DESCRIPTION OF SYMBOLS 2 ... Lamp (light source) 3 ... Projection part 5 ... Image supply apparatus (external apparatus) 6 ... Zoom lens (projection lens) 6a ... Optical axis 10 ... Projection system 11 ... Projector 21 ... Straight advance cylinder 21a ... ２２ 22 ... Cam cylinder 23-26 ... 1st-4th lens group 30-32 ... 1st-3rd moving frame 33 ... Holding frame 33a ... Helicoid 33b ... Focus ring 35-37 ... 1st-3rd cam pin 38-40 ... 1st-3rd 3rd cam 41 ... 2nd non-imaging area guide cam 42 ... Straight running guide opening 43 ... 2nd zoom cam 44 ... 3rd non-image area guide cam 45 ... 3rd zoom cam 47 ... 3rd 1 Non-imaging area guide cam 48 ... Movement prevention cam 50 ... Zoom motor 51 ... Gear train 52 ... Gear section 53 ... Operation detection section 54 ... Switch section 55 ... Touch screen 56 ... Display screen 57 ... Display unit 58 ... Wireless communication unit 59 ... External I / F 61a, 61b ... Lens array 62 ... Superimposing lens 65 ... Cooling fan 71 ... Illumination device 72 ... Light modulation device (light modulation unit) 73 ... Projection optical system ( Image projection unit) 74r, 74b ... Dichroic mirrors 75a to 75d ... Reflection mirror 76 ... Relay lens 77 ... Prism 79, 79r, 79g, 79b ... Liquid crystal light valve 81 ... Remote control light receiving unit 85 ... Operation panel 88 ... External device I / F 91 ... Control unit 91A ... Image output unit 91B ... Communication control unit 91C ... Display control unit 92 ... Storage unit 92A ... Control program 92B ... Image data 101 ... I / F 103 ... Control unit 103A ... Input image detection unit 103B ... Display control Part 105 ... Storage part 105A ... Control program 105B ... First lens position Position information 105C ... Second lens position information 107 ... Image processing unit 117 ... Light source driving unit 118 ... Cooling fan driving unit 119 ... Light modulation device driving unit 121 ... Projection optical system driving unit (lens position adjusting unit) 123 ... Input processing unit SC: Screen.

Claims (8)

A projector,
A light source that emits first light;
A light modulator that emits second light obtained by modulating the first light based on image data input from an external device;
An image projection unit including a projection lens, and projecting the second light using the projection lens;
A lens position adjusting unit for moving the projection lens;
When at least one of the operation state of the projector or the state of image data input from the external device meets a preset condition, a third incident light is incident on the lens position adjustment unit from the projection lens. A control unit that moves the projection lens to a position where light is not imaged by the light modulation unit;
A projector comprising:   When the input of image data from the external device is stopped, the control unit moves the projection lens to the lens position adjustment unit at a position where the third light is not imaged by the light modulation unit. The projector according to claim 1, wherein the projector is moved.   When the light modulation unit reduces the light amount to a predetermined light amount or less, the control unit projects the projection on the lens position adjustment unit at a position where the third light is not imaged by the light modulation unit. The projector according to claim 1, wherein the lens is moved. A storage unit for storing lens position information indicating a position of the projection lens when at least one of an operation state of the projector or a state of image data input from the external device satisfies a preset condition; Have
The projector according to claim 1, wherein the control unit controls the lens position adjustment unit based on the lens position information stored in the storage unit.   The projector according to claim 1, wherein the projection lens is a zoom lens.   The projector according to claim 5, wherein the position of the zoom lens where the second light is not imaged by the light modulation unit is closer to the light modulation unit than a tele end of the zoom lens.   The projector according to claim 5, wherein the position of the zoom lens at which the second light is not imaged by the light modulation unit is farther from the light modulation unit than a wide end of the zoom lens. A light source that emits first light; a light modulator that emits second light obtained by modulating the first light based on image data input from an external device; and a projection lens, the projection lens A projector control method comprising: an image projection unit that projects the second light using a lens position adjustment unit that moves the projection lens,
The lens position adjustment unit is configured to receive a third incident light from the projection lens when at least one of an operation state of the projector and a state of image data input from the external device satisfies a preset condition. A projector control method, wherein the projection lens is moved to a position where light is not imaged by the light modulator.

Images