JP2009135877A - Projector and method of controlling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector that can improve the operational convenience when a user interrupts or resumes playback of a recording medium, and an operation method for such a projector. <P>SOLUTION: When a lens cover open/close detection sensor 51 detects a state change of a lens cover 50 from open to closed, a lamp 11 is turned off, and the playback by a DVD playback unit is interrupted. When the lens cover open/close detection sensor 51 detects a state change of the lens cover 50 from closed to open, the lamp 11 is turned on, and the playback by the DVD playback unit 30 is started in accordance with predetermined requirements. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projector and a control method thereof, and more particularly, to a projector including a recording medium reproducing unit and a control method thereof.

  As a conventional projector, for example, in Patent Document 1, “DVD playback unit 3 is provided with an insertion slot 3a, and a DVD recording medium D is inserted so that playback from DVD or recording on DVD can be performed. The image reproduced by the DVD reproducing unit 3 is projected from the projection lens unit 2b onto a screen or the like. ”(See paragraphs 0019 and FIG. 1).

  As a conventional projector, for example, in Patent Document 2, it is configured that “the open / close state of the shutter 5 is input to the control unit 11 as an on / off state signal of the mechanical switch 21. When it is detected that the lamp is closed, the lamp 6 is turned off and the cool-down operation is started. When the cool-down operation is completed, the electronic switch 22 is turned off and the supply of the AC power supply 8 is stopped. (See summary).

  As a conventional information reproducing apparatus, for example, in Patent Document 3, “when the reproduction operation is interrupted, the reproduction position when the reproduction operation is interrupted is acquired and the next reproduction is performed based on the acquired information. The address information necessary for the special reproduction operation is acquired, the acquired address information is stored in the nonvolatile memory, and when the reproduction of the same optical disk is instructed, the address information stored in the nonvolatile memory is obtained. A resume reproduction method in an information reproducing apparatus characterized in that normal reproduction is performed after performing a special reproduction operation ”(refer to claim 1).

JP 2005-99617 A JP 2007-171895 A JP 2002-25235 A

  2. Description of the Related Art Conventionally, in a projector provided with a recording medium reproducing unit that reproduces information recorded on a recording medium such as a DVD (Digital Versatile Disc), for example, an operation relating to reproduction of the recording medium reproducing unit is performed by an operation key (button). It was. In addition, when it is not necessary to project an image, the front of the projection lens is blocked by a lens cover in order to prevent dust from being attached to the projection lens and scratches.

  However, when the reproduction of the recording medium is interrupted (including pause, reproduction stop, and power-off) and the image is not projected, the operation relating to the reproduction interruption of the recording medium reproducing means and the closing operation of the projection lens by the lens cover Must be performed separately. In addition, when resuming reproduction and projecting an image again, it is necessary to separately perform an operation for opening the lens cover and an operation relating to reproduction of the recording medium reproduction unit, and the operation is complicated. there were.

  In addition, when the image is not projected, it is necessary to turn off the lamp as the light source of the projected image light together with the above operation, and when the image is projected again, it is necessary to perform the lamp on operation together with the above operation. There is a problem that the operation is complicated.

  The present invention has been made to solve such problems, and to obtain a projector and an operation method thereof that can improve the convenience of operation when the reproduction of a recording medium is interrupted or resumed. Objective.

The projector according to the present invention includes a light source, lighting means for turning on or off the light source, recording medium reproducing means for reproducing information recorded on the recording medium and outputting a video signal, and input from the recording medium reproducing means A video signal processing unit that converts the generated video signal to generate a video signal for a projected video, and based on the video signal generated by the video signal processing unit, modulates light from the light source and emits video light A projection optical system having an optical modulation means, a projection lens, and enlarging and projecting image light emitted by the light modulation means, a lens cover for opening and closing the front of the projection lens, and detecting the opening and closing of the lens cover A lens cover open / close detection sensor for controlling the operation of at least the lighting means and the recording medium reproducing means, and the control section includes the lens cover open / close detection sensor. Detects the change from opening to closing of the lens cover, turns off the light source and interrupts playback of the recording medium playback means, and the lens cover open / close detection sensor detects the change from closing to opening of the lens cover. When detected, the light source is turned on and the reproduction of the recording medium reproducing means is started according to a predetermined condition. It should be noted that the suspension of reproduction of the recording medium reproduction means, the reproduction stop, or the interruption due to the power-off is collectively referred to as “reproduction interruption”. Examples of the light source include a lamp, a light emitting diode, and a laser diode.
In the present invention, when the lens cover open / close detection sensor detects a change from opening to closing of the lens cover, the light source is turned off and the reproduction of the recording medium reproducing means is interrupted. When a change from closed to open is detected, the light source is turned on and the reproduction of the recording medium reproduction means is started in accordance with a predetermined condition, so that the light source can be turned on or off without any troublesome operation, and the recording medium It is possible to interrupt or resume the reproduction of the reproduction means, and the convenience can be improved.

The projector according to the present invention includes a recording medium reproducing unit that reproduces information recorded on a recording medium and outputs a video signal, and a video signal for projection video obtained by converting the video signal input from the recording medium reproducing unit. A video signal processing unit for generating image light, light modulation means for emitting light by modulating light from a light source based on the video signal generated by the video signal processing unit, and a projection lens, and the light modulation A projection optical system for enlarging and projecting image light emitted by the means, a lens cover for opening and closing the front of the projection lens, a lens cover opening and closing detection sensor for detecting opening and closing of the lens cover, and at least the recording medium reproducing means A control unit that controls the operation, and the control unit detects the recording medium playback unit when the lens cover open / close detection sensor detects a change from opening to closing of the lens cover. Interrupt the reproduction, when the lens cover open and close detection sensor detects a change in the opening from the closed lens cover, it is intended to start the reproduction of the recording medium reproducing device according to a predetermined condition.
In the present invention, when the lens cover opening / closing detection sensor detects a change from opening to closing of the lens cover, the reproduction of the recording medium reproducing means is interrupted, and the lens cover opening / closing detection sensor changes from closing to opening of the lens cover. Since the reproduction of the recording medium reproducing unit is started according to a predetermined condition, the reproduction of the recording medium reproducing unit can be interrupted or resumed without performing a troublesome operation. Can be improved.

The projector according to the present invention further includes a light source and lighting means for turning on or off the light source, and the control unit detects when the lens cover opening / closing detection sensor detects a change from opening to closing of the lens cover, The light source is turned off, and the light source is turned on when the lens cover open / close detection sensor detects a change from closing to opening of the lens cover.
In the present invention, when the lens cover opening / closing detection sensor detects a change from opening to closing of the lens cover, the light source is turned off, and when the lens cover opening / closing detection sensor detects a change from closing to opening of the lens cover, Since the light source is turned on, the operation of turning on or off the light source can be performed without performing troublesome operations, and convenience can be improved.

The projector according to the present invention further includes a light source and a lighting unit that controls a light amount of the light source, and the control unit detects when the lens cover opening / closing detection sensor detects a change from opening to closing of the lens cover, The light amount of the light source is decreased, and the light amount of the light source is increased when the lens cover open / close detection sensor detects a change from closing to opening of the lens cover.
In the present invention, when the lens cover opening / closing detection sensor detects a change from opening to closing of the lens cover, the light amount of the light source is decreased, and the lens cover opening / closing detection sensor detects a change from closing to opening of the lens cover. Since the light quantity of the light source is increased, the light quantity of the light source can be increased in a short time when the lens cover is opened.

In the projector according to the aspect of the invention, when the lens cover open / close detection sensor detects a change from opening to closing of the lens cover, the control unit determines the amount of light emitted from the projection optical system by the light modulation unit. The light from the light source is modulated to be less than a predetermined amount of light, and when the lens cover open / close detection sensor detects a change from closing to opening of the lens cover, the light modulation means changes the light from the light source. Modulation is based on the video signal.
In the present invention, when the lens cover open / close detection sensor detects a change from opening to closing of the lens cover, the amount of light emitted from the projection optical system is less than a predetermined amount of light, and the lens cover open / close detection sensor is When a change from the closed to the open of the cover is detected, video light modulated based on the video signal is emitted, so that when the lens cover is closed, the amount of light from the light source irradiated to the lens cover can be reduced. The overheating of the lens cover can be suppressed.

In the projector according to the aspect of the invention, when the lens cover opening / closing detection sensor detects a change from opening to closing of the lens cover, the control unit suspends reproduction of the recording medium reproducing unit by temporarily stopping the lens cover When the cover open / close detection sensor detects a change from closing to opening of the lens cover, the temporary stop is canceled and the reproduction of the recording medium reproducing means is started.
In the present invention, the playback of the recording medium playback means is paused or released in response to the opening and closing of the lens cover, so that playback can be resumed from the position following the previous playback without performing any troublesome operations. Can do.

In the projector according to the aspect of the invention, the recording medium reproduction unit has a resume reproduction function, and the control unit detects the recording when the lens cover open / close detection sensor detects a change from opening to closing of the lens cover. The reproduction of the medium reproducing means is stopped (including power off), and the recording medium reproducing means is resumed when the lens cover open / close detection sensor detects a change from closing to opening of the lens cover.
In the present invention, the playback of the recording medium playback means is stopped or resumed according to the opening and closing of the lens cover, so that playback can be resumed from the position following the previous playback without performing any troublesome operations.

In the projector according to the aspect of the invention, the control unit starts the reproduction of the recording medium reproducing unit when a predetermined time has elapsed after the lens cover opening / closing detection sensor detects a change from closing to opening of the lens cover. It is something to be made.
In the present invention, after detecting the open state of the lens cover, the light source is turned on, and the reproduction of the recording medium reproducing means is started when a predetermined time has elapsed. Therefore, the reproduction is started with the operation of the light source being stable. be able to.

In the projector according to the aspect of the invention, the projector may further include an imaging unit that captures a projected image projected by the projection optical system, and the control unit may detect a change in the lens cover from closed to open by the lens cover open / close detection sensor. After that, when the light source is turned on and the illuminance of the projected image picked up by the image pickup means becomes a predetermined value or more, the reproduction of the recording medium reproduction means is started.
In the present invention, after detecting the open state of the lens cover, when the light source is turned on and the illuminance of the projected image exceeds a predetermined value, the reproduction of the recording medium reproducing means is started. The reproduction can be started in a state where the predetermined value or more is reached.

In the projector according to the aspect of the invention, the projector may further include an imaging unit that captures a projected image projected by the projection optical system, and the control unit may detect a change in the lens cover from closed to open by the lens cover open / close detection sensor. After that, when the illuminance of the projected image picked up by the image pickup means becomes greater than a predetermined value by increasing the light amount of the light source, the reproduction of the recording medium reproduction means is started.
In the present invention, after detecting the open state of the lens cover, when the light amount of the light source is increased and the illuminance of the projected image exceeds a predetermined value, the reproduction of the recording medium reproducing means is started. Reproduction can be started in a state where the length becomes equal to or greater than a predetermined value.

The projector control method according to the present invention includes a recording medium reproducing unit that reproduces information recorded on a recording medium and outputs a video signal, and a lens cover that opens and closes the front of the projection lens, and the recording medium reproducing unit A projector control method for projecting image light from the projection lens by modulating light from a light source based on an image signal input from the above, when detecting a change from opening to closing of the lens cover, The step of turning off the light source and interrupting the reproduction of the recording medium reproducing means, and when detecting the change from the closing to the opening of the lens cover, the light source is turned on and the recording medium according to a predetermined condition And a step of starting the reproduction of the reproduction means.
In the present invention, when the opening and closing of the lens cover is detected, the light source is turned off and the reproduction of the recording medium playback means is interrupted. When the opening and closing of the lens cover is detected, the light source is turned on and Since the reproduction of the recording medium reproducing means is started according to the conditions of the recording medium, the light source can be turned on or off, and the reproduction of the recording medium reproducing means can be interrupted or resumed without performing troublesome operations. Can be improved.

The projector control method according to the present invention includes a recording medium reproducing unit that reproduces information recorded on a recording medium and outputs a video signal, and a lens cover that opens and closes the front of the projection lens, and the recording medium reproducing unit A projector control method for projecting image light from the projection lens by modulating light from a light source based on an image signal input from the above, when detecting a change from opening to closing of the lens cover, A step of interrupting reproduction of the recording medium reproduction means, and a step of starting reproduction of the recording medium reproduction means according to a predetermined condition when a change from closing to opening of the lens cover is detected. .
In the present invention, the reproduction of the recording medium reproducing means is interrupted when the opening and closing of the lens cover is detected, and the reproduction of the recording medium reproducing means is performed according to a predetermined condition when the opening and closing of the lens cover is detected. Since the operation is started, the light source can be turned on or off and the reproduction of the recording medium reproducing unit can be interrupted or resumed without performing any troublesome operations, and convenience can be improved.

In the projector control method according to the present invention, the step of interrupting the reproduction of the recording medium reproducing unit reduces the light amount of the light source, interrupts the reproduction of the recording medium reproducing unit, and In the step of starting reproduction, the light quantity of the light source is increased, and reproduction of the recording medium reproducing unit is started.
In the present invention, when the change from the opening to the closing of the lens cover is detected, the light amount of the light source is decreased, and when the change from the closing to the opening of the lens cover is detected, the light amount of the light source is increased. When the is opened, the light amount of the light source can be increased in a short time.

In the projector control method according to the present invention, the step of interrupting the reproduction of the recording medium reproducing unit modulates the light from the light source so that the amount of light emitted from the projection lens is less than a predetermined amount of light. The step of interrupting the reproduction of the recording medium reproduction unit and starting the reproduction of the recording medium reproduction unit modulates the light from the light source based on the video signal and starts the reproduction of the recording medium reproduction unit. Is.
In the present invention, when detecting a change from opening to closing of the lens cover, the amount of light emitted from the projection lens is set to be less than a predetermined amount of light, and when detecting a change from closing to opening of the lens cover, Since the image light modulated based on the image signal is emitted, when the lens cover is closed, the amount of light from the light source applied to the lens cover can be reduced, and overheating of the lens cover can be suppressed.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing the configuration of the projector according to the first embodiment. As shown in the figure, the projector 1 projects a lamp 11 as a light source and liquid crystal light valves 12R, 12G, and 12B as light modulating means (hereinafter simply referred to as “liquid crystal light valve 12” if not distinguished). Optical system 13, liquid crystal light valve drive unit 14, control unit 20, DVD playback unit 30 as a recording medium playback unit, video signal processing unit 32, frame memory 33, trapezoidal distortion correction unit 34, lighting Ballast 40, a focus control unit 41, a zoom control unit 42, an operation signal processing unit 43, an operation panel 44, a storage unit 45, a lens cover 50, and a lens that detects opening and closing of the lens cover 50. A cover open / close detection sensor 51 is provided. The DVD playback unit 30 has a playback control unit 31, and the projection optical system 13 has a projection lens 13 a. The projector 1 projects video light corresponding to the input video signal supplied from the DVD playback unit 30 and enlarges and projects it onto a projection target (hereinafter referred to as “screen SC”) such as a screen, a white wall, or a whiteboard. Is.
In this embodiment, the case where the lamp 11 is used as a light source will be described. However, the present invention is not limited to this, and an arbitrary light source such as a light emitting diode or a laser diode may be used.

  The control unit 20 includes a video signal processing unit 32, a trapezoidal distortion correction unit 34, a ballast 40, a focus control unit 41, a zoom control unit 42, an operation signal processing unit 43, a storage unit 45, a lens cover open / close detection sensor 51, and a DVD playback. The control unit 20 is connected to the reproduction control unit 31 of the unit 30, and is configured by a microprocessor or the like, executes a control program stored in the storage unit 45, and performs overall control of the operation of the projector 1. 20 calculates various data input from each unit connected to 20 and outputs a calculation result to each unit. In addition, the operation of the DVD playback unit 30 is controlled based on the operation signal from the operation signal processing unit 43 and the detection result of the lens cover open / close detection sensor 51 by the operation described later.

The DVD reproduction unit 30 is provided with an insertion slot (not shown), reproduces information recorded on the DVD when a DVD as a recording medium is inserted, and outputs a video signal to the video signal processing unit 32. Is. The DVD playback unit 30 is controlled by the playback control unit 31 to control various DVD playback operations such as DVD playback, pause, playback stop, fast forward / rewind playback, skip, and DVD menu display. The DVD playback unit 30 also has a resume playback function. When playback is stopped or the power is turned off, time information, track information, etc. at the time of stop are stored in the memory, and when playback is started again, the memory is stored. With reference to the information stored in, reproduction is possible from the position following the previous reproduction.
In the first embodiment, a case where a DVD is reproduced as a recording medium will be described. However, the present invention is not limited to this, and the video tape, CD (Compact Disc), HD DVD (High Definition DVD), Blu-ray Any storage medium such as a ray disc may be played back. Accordingly, it is possible to provide the projector 1 including a device that reproduces a wide range of images or sounds. HD DVD is a registered trademark of DVD Dee Format Logo Licensing Co., Ltd. Blu-ray Disc is a registered trademark of Sony Corporation.

  The video signal processing unit 32 is configured by a signal processing circuit such as a microprocessor (for example, DSP), for example, and performs various processes by executing a control program stored in a storage unit incorporated therein. In addition, a frame memory 33 is connected to the video signal processing unit 32, and the video signal from the DVD playback unit 30 is stored in the frame memory 33 for each frame (one video screen) and stored in the frame memory 33. A video image (hereinafter also referred to as a “frame video”), and various signal processing such as resolution conversion processing for matching the resolution of the video signal to the resolution of the liquid crystal light valve 12 is performed. Generate a video signal.

  Further, the video signal processing unit 32 has a function of performing OSD (On-Screen Display) processing, and is used when characters and symbols representing various states of the projector 1 and image quality adjustment are performed according to control commands of the control unit 20. A process of combining the OSD video signal of the menu video with the frame video signal is performed. Specifically, the control unit 20 reads out menu video data or the like from the storage unit 45, for example, and supplies it to the video signal processing unit 32. The video signal processing unit 32 generates an OSD video signal from the menu video data, for example, and this OSD The video signal is combined with the frame video signal. If OSD processing is not performed, the frame video signal is output as it is. When the menu image is displayed by the OSD process, the user sets or adjusts the function of each unit of the projector 1 according to the menu image.

  The trapezoidal distortion correction unit 34 corrects the input video signal to suppress the trapezoidal distortion that occurs when projection (tilting projection) is performed with the projector 1 tilted with respect to the screen SC. Is output to the liquid crystal light valve driving unit 14. If no trapezoidal distortion occurs, the video signal output from the video signal processing unit 32 is supplied to the liquid crystal light valve driving unit 14 as it is without performing the above correction.

  The liquid crystal light valve driving unit 14 drives the liquid crystal light valves 12R, 12G, and 12B in accordance with the input video signal. In the liquid crystal light valves 12R, 12G, and 12B, a plurality of pixels (not shown) are formed in a matrix, and the transmittance of each pixel is adjusted by the liquid crystal light valve driving unit 14, whereby the lamp 11 R (red), G (green), and B (blue) light beams emitted from the color light separation optical system (not shown) are separated by corresponding liquid crystal light valves 12R, 12G, and 12B. Modulate. The image lights emitted from the liquid crystal light valves 12R, 12G, and 12B are combined by a combining optical system such as a cross dichroic prism (not shown), and enlarged and projected on the screen SC by the projection lens 13a of the projection optical system 13. . Further, the projection optical system 13 includes a focus mechanism that can change the focus of the projection light and a zoom mechanism that can change the magnification of the projection light.

  The ballast 40 is lighting means for turning on or off the lamp 11 in accordance with an instruction from the control unit 20. For example, when the lamp 11 is a high-pressure discharge lamp, a lighting circuit for applying a starting voltage or an appropriate lamp current is provided. It consists of a ballast to be supplied.

  The focus control unit 41 can adjust the focus state by moving the focus lens constituting the focus mechanism of the projection optical system 13 in the optical axis direction in accordance with an instruction from the control unit 20. The focus control unit 41 can also detect the focus adjustment amount, that is, the focus lens movement amount (focus amount), and can output the detected focus amount to the control unit 20. As a method for detecting the focus amount, a detection mechanism such as a rotary encoder or a potentiometer that detects the rotation amount of a rotary cam mechanism (not shown) for moving the focus lens in the optical axis direction can be used. Alternatively, the focus amount may be detected based on the number of steps of a stepping motor that is a drive source of the focus mechanism.

  In accordance with an instruction from the control unit 20, the zoom control unit 42 moves the zoom lens constituting the zoom mechanism of the projection optical system 13 in the optical axis direction to change the focal length, thereby changing the image displayed on the screen SC. It is possible to change the enlargement ratio. The zoom control unit 42 also functions as a zoom amount detection unit that detects the focal length, that is, the movement amount (zoom amount) of the zoom lens, and can output the detected zoom amount to the control unit 20. As a method of detecting the zoom amount, as with the method of detecting the focus amount, detection by a rotary encoder, a potentiometer, or the like that detects the rotation amount of a rotary cam mechanism (not shown) for moving the zoom lens in the optical axis direction. It may be detected by a mechanism, or may be detected based on the number of steps of a stepping motor that is a drive source of the zoom mechanism.

The operation panel 44 includes operation keys related to DVD playback operations such as a power on / off key, a play key, a pause key, a stop key, a menu key, a volume key and a skip key, and a trapezoid for performing an operation according to a keystone distortion correction direction. Various switches for changing the state of the projector 1 such as a correction key and an input switching key are provided. Then, an operation signal corresponding to the key operation by the user is output to the operation signal processing unit 43.
Similarly to the operation panel 44, the remote controller (hereinafter referred to as "remote controller") RC has various switches and outputs an operation signal corresponding to a key operation by the user to the operation signal processing unit 43. The operation signal processing unit 43 receives an operation signal input from the operation panel 44 or the remote controller RC and outputs it to the control unit 20.

  The storage unit 45 stores a control program executed by the control unit 20, menu images for image quality adjustment, and OSD information for generating OSD images such as display of trapezoidal distortion correction amounts. Various setting values are stored.

  FIG. 2 is a diagram schematically showing the appearance of the projector according to the first embodiment. 2A is a diagram illustrating a state in which the lens cover 50 is open, and FIG. 2B is a diagram illustrating a state in which the lens cover 50 is closed. As shown in FIG. 2, a lens cover 50 that opens and closes the front of the projection lens 13 a by sliding left and right by a user's manual operation is provided on the housing of the projector 1. When projecting an image, the lens cover 50 opens the front of the projection lens 13a as shown in FIG. 2A. When the lens cover 50 is not used or stopped for reproduction as described later, the projection lens 13a is used as shown in FIG. 2B. The front of the projector is closed to prevent dust from adhering to and scratching the projection lens 13a.

  Further, the projector 1 is provided with a lens cover open / close detection sensor 51 that detects opening / closing of the lens cover 50, and is configured by, for example, a contact switch or the like, and when the lens cover is in an open state (FIG. 2 (a)). When the contact switch is turned on, the opening of the lens cover 50 (hereinafter referred to as “lens cover open”) is detected, and when the lens cover is closed (FIG. 2B), the contact switch is turned off. The blocking of the lens cover 50 (hereinafter referred to as “lens cover closing”) is detected. As long as the opening / closing of the lens cover 50 is detected, not only a mechanical contact switch but also a device that detects the opening / closing state electrically and optically may be used.

  In the first embodiment, the case where the slide-type lens cover 50 is provided will be described. However, the present invention is not limited to this, and may be anything that opens and closes the front of the projection lens 13a. A cap may be used. In this case, as the lens cover open / close detection sensor 51, a sensor capable of detecting attachment / detachment of the lens cap is used.

The projector 1 having such a configuration reproduces information recorded on the DVD and enlarges and projects an image on the screen SC by the following operation.
First, the user turns on the projector 1 by operating the power-on key of the operation panel 44 or the remote controller RC. Then, after inserting a desired DVD into the DVD playback unit 30 and opening the lens cover 50 by manual operation, a playback key, a menu key, and the like are operated. As a result, the lens cover open / close detection sensor 51 receives the lens cover open detection signal and the operation signal processing unit 43 receives the operation signal corresponding to the key operation. Then, the control unit 20 instructs the reproduction control unit 31 of the DVD reproduction unit 30 to reproduce the DVD or the like according to the input operation signal.

  The reproduction control unit 31 reproduces the DVD in accordance with an instruction from the control unit 20 and outputs the video signal to the video signal processing unit 32. The video signal processing unit 32 converts the input video signal to generate a video signal for projection video, and outputs the video signal to the liquid crystal light valve driving unit 14. The liquid crystal light valve drive unit 14 drives the liquid crystal light valve 12 in accordance with the input video signal. The liquid crystal light valve 12 modulates the light of the lamp 11 and emits image light by adjusting the transmittance of each pixel by the liquid crystal light valve driving unit 14. This image light is projected onto the screen SC via the projection optical system 13, and an image corresponding to the input image signal is enlarged and projected onto the screen SC.

During playback of a DVD and projection of an image on the screen SC by such an operation, for example, when the user suspends DVD viewing, the lens cover 50 is closed by user operation, and DVD viewing is resumed. The lens cover 50 is opened by a user operation.
Hereinafter, the operation in the first embodiment for controlling the operation of the lamp 11 and the DVD reproducing unit 30 according to the opening and closing of the lens cover 50 will be described with reference to FIGS. 3 and 4.

FIG. 3 is an operation flowchart when the lens cover according to Embodiment 1 is closed.
First, the operation when the lens cover 50 is closed during DVD playback will be described with reference to FIG.
When the lens cover 50 is closed by the user, a lens cover closing detection signal is input to the control unit 20 from the lens cover opening / closing detection sensor 51. When the control unit 20 detects a change from opening to closing of the lens cover 50 based on the detection signal (S101), the control unit 20 instructs the ballast 40 to turn off the lamp 11, and the ballast 40 turns off the lamp 11 (S102). . Then, the control unit 20 instructs the playback control unit 31 to pause the playback of the DVD. The playback control unit 31 temporarily stops playback of the DVD based on an instruction from the control unit 20 (S103).

  Note that the interruption of reproduction is not limited to a pause, and a reproduction stop may be instructed. Further, the reproduction may be interrupted by turning off the power. Further, for example, any one of pause, playback stop, or power-off may be selected according to the user setting. In addition, when playback is interrupted due to playback stop or power off, the playback control unit 31 stores time information, track information, and the like at the time of stop in a memory.

FIG. 4 is an operation flowchart when the lens cover according to Embodiment 1 is opened.
Next, the operation when the lens cover 50 is opened after the reproduction is interrupted will be described with reference to FIG.
When the lens cover 50 is opened by the user, a lens cover open detection signal is input from the lens cover open / close detection sensor 51 to the control unit 20. When the control unit 20 detects a change from closing to opening of the lens cover 50 based on the detection signal (S111), the control unit 20 instructs the ballast 40 to turn on the lamp 11, and the ballast 40 turns on the lamp 11 (S112). . Then, the control unit 20 determines whether or not a predetermined time has elapsed after the lamp 11 is turned on (S113). The predetermined time can be set according to the type of the lamp 11 and the like, for example, the time until the predetermined amount of light is emitted after the lamp 11 is turned on again.
The control unit 20 instructs the reproduction control unit 31 to start reproducing the DVD when a predetermined time has elapsed after the lamp 11 is turned on. Based on the instruction from the control unit 20, the playback control unit 31 releases the pause and starts playback of the DVD (S114).

  In the above-described interruption of reproduction, when reproduction is interrupted by stopping reproduction or turning off the power, the reproduction control unit 31 refers to the information stored at the time of stopping reproduction and turning off the power, and continues from the previous reproduction. To start playback (resume playback).

  In the above description, the control unit 20 waits for a predetermined time after the lamp 11 is lit and gives an instruction to start playback of the DVD. However, the present invention is not limited to this, and the predetermined time is zero. DVD playback may be started immediately after the lamp 11 is turned on.

  As described above, in the first embodiment, when the lens cover 50 is closed, the lamp 11 is turned off to interrupt DVD reproduction, and when the lens cover 50 is opened, the lamp 11 is turned on to turn on the DVD. By resuming the reproduction, the operation of turning on or off the lamp 11 and interrupting or resuming the DVD reproduction can be performed without performing troublesome operations, and convenience can be improved. That is, the lamp 11 can be turned off, the lens cover 50 can be closed, and the DVD playback can be interrupted by a single operation of closing the lens cover 50. The lamp 11 can be turned on, The operation of opening the lens cover 50 and starting the reproduction of the DVD can be performed by a single operation of opening the lens cover 50.

  In addition, since the lamp 11 can be turned on or off and the DVD playback can be interrupted or resumed by opening or closing the lens cover 50, the operation can be performed intuitively and easily by operating buttons such as operation keys. Can do.

  In addition, since the reproduction of the DVD is resumed after waiting for a predetermined time after the lamp 11 is lit, the reproduction can be started with the lamp 11 being lit stably.

  Further, the reproduction of the DVD is interrupted by a pause, and the pause is canceled when the DVD is resumed. Therefore, the reproduction can be resumed from the position following the previous reproduction.

  In addition, the playback of the DVD is interrupted by stopping the playback or turning off the power, and the playback is resumed using the resume playback function at the time of restarting, so that the playback can be resumed from the position following the previous playback.

Embodiment 2. FIG.
FIG. 5 is a block diagram showing a configuration of the projector according to the second embodiment.
In addition to the configuration of the first embodiment, the projector 1 according to the first embodiment includes a CCD camera 52 that is an imaging unit that captures a projected image projected onto the screen SC by the projection optical system 13.

  The CCD camera 52 has a plurality of light receiving elements (not shown) formed in a matrix, and outputs information of electrical signals photoelectrically converted by the light receiving elements to the control unit 20. Since other configurations and operations are the same as those of the first embodiment, description thereof is omitted.

  Next, the operation when the lens cover 50 is opened in the second embodiment will be described with reference to FIG. The operation when the lens cover 50 is closed during DVD playback is the same as that in the first embodiment (FIG. 3).

FIG. 6 is an operation flowchart when the lens cover according to Embodiment 2 is opened.
When the lens cover 50 is opened by the user after the lens cover 50 is closed during playback of the DVD and the playback is interrupted by the same operation as in the first embodiment described above, the control unit 20 includes a lens cover open / close detection sensor. A lens cover open detection signal is input from 51. When the control unit 20 detects a change from the closing to the opening of the lens cover 50 based on the detection signal (S211), the control unit 20 instructs the ballast 40 to turn on the lamp 11, and the ballast 40 turns on the lamp 11 (S212). . The light from the lamp 11 is modulated by the liquid crystal light valve 12 and projected onto the screen SC by the projection optical system 13. At this time, when the reproduction of the DVD is interrupted due to the pause, the projected image of the video screen being paused is projected onto the screen SC. Further, when the reproduction is interrupted or the reproduction is interrupted by turning off the power, the white light is projected on the screen SC without modulating the light from the predetermined video screen or the lamp 11.

  Next, the control unit 20 determines whether or not the brightness of the projected image, for example, the illuminance of the projected image is greater than or equal to a predetermined value, based on the information of the projected image captured by the CCD camera 52 (S213). When it is determined that the illuminance is equal to or higher than the predetermined value, the reproduction control unit 31 is instructed to start reproducing the DVD. Based on the instruction from the control unit 20, the playback control unit 31 releases the pause and starts playback of the DVD (S114). Also in the second embodiment, when the reproduction is interrupted by stopping the reproduction or turning off the power, the reproduction control unit 31 refers to the information stored when the reproduction is stopped and the power is turned off, and continues the previous reproduction. Start playback (resume playback) from the position.

  As described above, in the second embodiment, in addition to the same effects as those of the first embodiment, the reproduction of the DVD is resumed when the illuminance of the projected image picked up by the CCD camera 52 exceeds a predetermined value. Therefore, reproduction can be started in a state where the brightness of the projected image is equal to or higher than a predetermined value.

  In the first and second embodiments, the case where the lighting or extinguishing of the lamp 11 and the interruption or resumption of DVD playback are controlled when the opening or closing of the lens cover 50 is detected has been described. However, the present invention is not limited to this, and only interruption or resumption of DVD playback may be controlled.

Embodiment 3 FIG.
In the first or second embodiment, the case where the lamp 11 is turned on or off has been described. In the third embodiment, a mode in which the light amount of the lamp 11 is changed will be described.

  The ballast 40 according to the first embodiment reduces or increases the light amount of the lamp 11 in accordance with an instruction from the control unit 20. For example, when the lamp 11 is a high-pressure discharge lamp, dimming control is performed by increasing or decreasing the lamp current. Other configurations are the same as those of the first embodiment, and the same portions are denoted by the same reference numerals and the description thereof is omitted.

FIG. 7 is an operation flowchart when the lens cover according to Embodiment 3 is closed.
First, the operation when the lens cover 50 is closed during DVD playback will be described with reference to FIG.
When the lens cover 50 is closed by the user, a lens cover closing detection signal is input to the control unit 20 from the lens cover opening / closing detection sensor 51. When the control unit 20 detects a change from opening to closing of the lens cover 50 based on the detection signal (S301), the control unit 20 instructs the ballast 40 to decrease the light amount of the lamp 11, and the ballast 40 decreases the light amount of the lamp 11. (S302). For example, when the lamp 11 is a high-pressure discharge lamp, the dimming control is performed so that the lamp current becomes the minimum lamp current that can continue the discharge.

  Then, the control unit 20 instructs the playback control unit 31 to pause the playback of the DVD. The playback control unit 31 temporarily stops playback of the DVD based on an instruction from the control unit 20 (S303).

  Note that the interruption of reproduction is not limited to a pause, and a reproduction stop may be instructed. Further, the reproduction may be interrupted by turning off the power. Further, for example, any one of pause, playback stop, or power-off may be selected according to the user setting. In addition, when playback is interrupted due to playback stop or power off, the playback control unit 31 stores time information, track information, and the like at the time of stop in a memory.

FIG. 8 is an operation flowchart when the lens cover according to Embodiment 3 is opened.
Next, the operation when the lens cover 50 is opened after the reproduction is interrupted will be described with reference to FIG.
When the lens cover 50 is opened by the user, a lens cover open detection signal is input from the lens cover open / close detection sensor 51 to the control unit 20. When the control unit 20 detects a change from closing to opening of the lens cover 50 based on the detection signal (S311), the control unit 20 instructs the ballast 40 to increase the light amount of the lamp 11, and the ballast 40 increases the light amount of the lamp 11. (S312). For example, when the lamp 11 is a high pressure discharge lamp, the increase in the amount of light is controlled so that the lamp current becomes a rated value.

  Then, the control unit 20 instructs the playback control unit 31 to start playback of the DVD. Based on the instruction from the control unit 20, the playback control unit 31 releases the pause and starts playback of the DVD (S313).

  In the above-described interruption of reproduction, when reproduction is interrupted by stopping reproduction or turning off the power, the reproduction control unit 31 refers to the information stored at the time of stopping reproduction and turning off the power, and continues from the previous reproduction. To start playback (resume playback).

  In the above description, the control unit 20 starts the reproduction of the DVD immediately after the instruction to increase the light amount of the lamp 11. However, the present invention is not limited to this, and a predetermined time elapses after the instruction to increase the light amount of the lamp 11. You may wait and instruct | indicate the reproduction | regeneration start of DVD. Thereby, for example, the dimming control for increasing the light amount of the lamp 11 is completed, and the reproduction can be started after the light amount is stabilized. Further, as described in the second embodiment, the CCD camera 52 as the imaging means is provided, and the reproduction of the DVD is resumed when the illuminance of the projected image captured by the CCD camera 52 exceeds a predetermined level. May be. Thereby, the reproduction can be started in a state where the brightness of the projected image is equal to or higher than a predetermined value.

  As described above, in the third embodiment, in addition to the effects of the first embodiment, the light amount of the lamp 11 is decreased or increased by opening / closing the lens cover 50, so the lamp 11 is turned off and turned on again. Compared to the case, the light quantity of the lamp 11 can be increased in a short time when the lamp cover 50 is opened.

  In addition, since the blinking frequency of the lamp 11 can be reduced, for example, when the lamp 11 is a high pressure discharge lamp, the load at the time of starting the lamp can be reduced and the lamp life can be extended.

Embodiment 4 FIG.
In the fourth embodiment, a mode in which the amount of light emitted from the projection optical system 13 is changed will be described. Note that the configuration of the projector 1 in the present embodiment is the same as that in the first embodiment, and the same portions are denoted by the same reference numerals and the description thereof is omitted.

FIG. 9 is an operation flowchart when the lens cover according to Embodiment 4 is closed.
First, the operation when the lens cover 50 is closed during DVD playback will be described with reference to FIG.
When the lens cover 50 is closed by the user, a lens cover closing detection signal is input to the control unit 20 from the lens cover opening / closing detection sensor 51. When the control unit 20 detects a change from opening to closing of the lens cover 50 based on the detection signal (S401), the control unit 20 changes the light from the lamp 11 so that the light amount emitted from the projection optical system 13 is less than a predetermined light amount. Modulate (s402). This modulation is performed, for example, by supplying a frame image (for example, a black screen) that minimizes the transmittance of each pixel of the liquid crystal light valve 12 to the liquid crystal light valve driving unit 14 via the video signal processing unit 32. Do. The modulation method is not limited to this, and any modulation method may be used as long as the amount of light emitted from the projection optical system 13 is reduced. At least a part of the light from the lamp 11 is blocked by the liquid crystal light valve 12. good.

  Next, the control unit 20 instructs the playback control unit 31 to pause playback of the DVD. The playback control unit 31 temporarily stops playback of the DVD based on the instruction from the control unit 20 (S403).

  Note that the interruption of reproduction is not limited to a pause, and a reproduction stop may be instructed. Further, the reproduction may be interrupted by turning off the power. Further, for example, any one of pause, playback stop, or power-off may be selected according to the user setting. In addition, when playback is interrupted due to playback stop or power off, the playback control unit 31 stores time information, track information, and the like at the time of stop in a memory.

FIG. 10 is an operation flowchart when the lens cover according to Embodiment 4 is opened.
Next, the operation when the lens cover 50 is opened after the reproduction is interrupted will be described with reference to FIG.
When the lens cover 50 is opened by the user, a lens cover open detection signal is input from the lens cover open / close detection sensor 51 to the control unit 20. When the control unit 20 detects a change from the closing to the opening of the lens cover 50 based on the detection signal (S411), the liquid crystal light valve 12 modulates the light from the lamp 11 based on the video signal (S412). That is, the video signal processing unit 32 converts the input video signal to generate a video signal for projection video, and supplies the video signal to the liquid crystal light valve driving unit 14. The liquid crystal light valve 12 is driven according to the input video signal. As a result, an image corresponding to the input image signal is enlarged and projected onto the screen SC via the projection optical system 13.

  Next, the control unit 20 instructs the playback control unit 31 to start playback of the DVD. Based on an instruction from the control unit 20, the playback control unit 31 releases the pause and starts playback of the DVD (S413).

  In the above-described interruption of reproduction, when reproduction is interrupted by stopping reproduction or turning off the power, the reproduction control unit 31 refers to the information stored at the time of stopping reproduction and turning off the power, and continues from the previous reproduction. To start playback (resume playback).

  As described above, in the fourth embodiment, in addition to the effect of the first embodiment, when the lens cover 50 is closed, the lamp is configured so that the light amount emitted from the projection optical system 13 is less than the predetermined light amount. 11 is modulated, the amount of light from the lamp 11 irradiated to the lens cover 50 can be reduced, and overheating of the lens cover 50 can be suppressed.

  In addition, since it is not necessary to turn on or off the lamp 11 or to perform control for increasing or decreasing the amount of light, DVD playback can be resumed in a short time when the lens cover is opened.

  In addition, since the blinking frequency of the lamp 11 can be reduced, for example, when the lamp 11 is a high pressure discharge lamp, the load at the time of starting the lamp can be reduced and the lamp life can be extended.

  In the first to fourth embodiments, the light emitted from the lamp 11 is modulated using the liquid crystal light valve 12, but the present invention is not limited to this, and other spatial light modulators may be used. For example, a DMD (Digital Micromirror Device) that projects an image by controlling the tilt of a mirror with a small area spread on a semiconductor substrate based on an image signal may be used. DMD is a registered trademark of Texas Instruments Incorporated.

1 is a block diagram illustrating a configuration of a projector according to a first embodiment. 1 is a diagram schematically showing an external appearance of a projector according to a first embodiment. 6 is an operation flowchart when the lens cover according to Embodiment 1 is closed. 4 is an operation flowchart when the lens cover according to Embodiment 1 is opened. FIG. 6 is a block diagram showing a configuration of a projector according to a second embodiment. 10 is an operation flowchart when the lens cover according to Embodiment 2 is opened. 10 is an operation flowchart when the lens cover according to Embodiment 3 is closed. 10 is an operation flowchart when the lens cover according to Embodiment 3 is opened. 10 is an operation flowchart when the lens cover according to Embodiment 4 is closed. 10 is an operation flowchart when the lens cover according to Embodiment 4 is opened.

Explanation of symbols

  1 projector, 11 lamp, 12R liquid crystal light valve, 12G liquid crystal light valve, 12B liquid crystal light valve, 13 projection optical system, 13a projection lens, 14 liquid crystal light valve drive unit, 20 control unit, 30 DVD playback unit, 31 playback control unit 32 Video signal processing unit 33 Frame memory 34 Trapezoidal distortion correction unit 40 Ballast 41 Focus control unit 42 Zoom control unit 43 Operation signal processing unit 44 Operation panel 45 Storage unit 50 Lens cover 51 Lens Cover open / close detection sensor, 52 CCD camera, RC remote control, SC screen.

Claims (14)

A light source;
Lighting means for turning on or off the light source;
Recording medium reproducing means for reproducing information recorded on the recording medium and outputting a video signal;
A video signal processing unit that converts a video signal input from the recording medium playback means to generate a video signal for a projected video;
Light modulating means for modulating light from the light source and emitting image light based on the image signal generated by the image signal processing unit;
A projection optical system having a projection lens and enlarging and projecting image light emitted by the light modulation means;
A lens cover that opens and closes the front of the projection lens;
A lens cover opening / closing detection sensor for detecting opening / closing of the lens cover;
A control unit for controlling operations of at least the lighting unit and the recording medium reproducing unit,
The controller is
When the lens cover open / close detection sensor detects a change from opening to closing of the lens cover, the light source is turned off and the reproduction of the recording medium reproducing means is interrupted,
When the lens cover open / close detection sensor detects a change from closing to opening of the lens cover, the light source is turned on, and reproduction of the recording medium reproducing means is started according to a predetermined condition. . Recording medium reproducing means for reproducing information recorded on the recording medium and outputting a video signal;
A video signal processing unit that converts a video signal input from the recording medium playback means to generate a video signal for a projected video;
Light modulating means for modulating the light from the light source based on the video signal generated by the video signal processing unit and emitting the video light;
A projection optical system having a projection lens and enlarging and projecting image light emitted by the light modulation means;
A lens cover that opens and closes the front of the projection lens;
A lens cover opening / closing detection sensor for detecting opening / closing of the lens cover;
A control unit for controlling the operation of at least the recording medium reproducing means,
The controller is
When the lens cover open / close detection sensor detects a change from opening to closing of the lens cover, the playback of the recording medium playback means is interrupted,
A projector characterized in that, when the lens cover open / close detection sensor detects a change from closing to opening of a lens cover, the recording medium reproducing means starts reproduction according to a predetermined condition. Further comprising a light source and lighting means for turning on or off the light source,
The controller is
When the lens cover open / close detection sensor detects a change from opening to closing of the lens cover, the light source is turned off,
3. The projector according to claim 2, wherein the light source is turned on when the lens cover opening / closing detection sensor detects a change from closing to opening of the lens cover. Further comprising a light source and lighting means for controlling the light quantity of the light source,
The controller is
When the lens cover open / close detection sensor detects a change from opening to closing of the lens cover, the light amount of the light source is decreased,
3. The projector according to claim 2, wherein when the lens cover open / close detection sensor detects a change from closing to opening of the lens cover, the light amount of the light source is increased. The controller is
When the lens cover open / close detection sensor detects a change from opening to closing of the lens cover, the light from the light source is controlled so that the light amount emitted from the projection optical system is less than a predetermined light amount by the light modulation means. Modulate
The light modulation unit modulates light from the light source based on the video signal when the lens cover open / close detection sensor detects a change from closing to opening of the lens cover. projector. The controller is
When the lens cover opening / closing detection sensor detects a change from opening to closing of the lens cover, the playback of the recording medium playback means is suspended by pausing,
6. The recording medium reproducing means according to claim 1, wherein when the lens cover opening / closing detection sensor detects a change from closing to opening of the lens cover, the pause is released and reproduction of the recording medium reproducing means is started. A projector according to any one of the above. The recording medium playback means has a resume playback function,
The controller is
When the lens cover open / close detection sensor detects a change from opening to closing of the lens cover, the playback of the recording medium playback means is stopped,
6. The projector according to claim 1, wherein when the lens cover open / close detection sensor detects a change from closing to opening of the lens cover, the recording medium playback means is resumed. The controller is
8. The reproduction of the recording medium reproducing means is started when a predetermined time elapses after the lens cover open / close detection sensor detects a change from closing to opening of the lens cover. A projector according to any one of the above. An image pickup means for picking up an image projected by the projection optical system;
The controller is
After the lens cover open / close detection sensor detects a change from closing to opening of the lens cover, the recording medium is turned on when the illuminance of the projected image picked up by the image pickup means is turned on by turning on the light source 8. The projector according to claim 1, wherein reproduction of the reproduction unit is started. An image pickup means for picking up an image projected by the projection optical system;
The controller is
After the lens cover open / close detection sensor detects a change from closing to opening of the lens cover, the light intensity of the light source is increased and when the illuminance of the projected image captured by the imaging unit becomes a predetermined value or more, 8. The projector according to claim 4, wherein playback of the recording medium playback means is started. A recording medium reproducing unit that reproduces information recorded on the recording medium and outputs a video signal; and a lens cover that opens and closes the front of the projection lens, and a light source based on the video signal input from the recording medium reproducing unit A projector control method for modulating image light and projecting image light from the projection lens,
When detecting a change from opening to closing of the lens cover, turning off the light source and interrupting playback of the recording medium playback means;
And a step of turning on the light source and starting reproduction of the recording medium reproducing means according to a predetermined condition when detecting a change from closing to opening of the lens cover. Method. A recording medium reproducing unit that reproduces information recorded on the recording medium and outputs a video signal; and a lens cover that opens and closes the front of the projection lens, and a light source based on the video signal input from the recording medium reproducing unit A projector control method for modulating image light and projecting image light from the projection lens,
A step of interrupting reproduction of the recording medium reproducing means when detecting a change from opening to closing of the lens cover;
And a step of starting reproduction of the recording medium reproducing means in accordance with a predetermined condition when detecting a change from closing to opening of the lens cover. The step of interrupting the reproduction of the recording medium reproducing means reduces the light amount of the light source and interrupts the reproduction of the recording medium reproducing means,
13. The projector control method according to claim 12, wherein the step of starting the reproduction of the recording medium reproducing unit starts the reproduction of the recording medium reproducing unit while increasing the light amount of the light source. The step of interrupting reproduction of the recording medium reproducing means modulates light from the light source and interrupts reproduction of the recording medium reproducing means so that the amount of light emitted from the projection lens is less than a predetermined amount of light. ,
13. The projector according to claim 12, wherein the step of starting reproduction of the recording medium reproduction unit modulates light from the light source based on the video signal and starts reproduction of the recording medium reproduction unit. Control method.

Images