JP2015158652A - Projector, and control method of projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector for drawing with an electronic pen, and can prevent a user from forgetting to return the electronic pen to a predetermined place after use.SOLUTION: When a predetermined period of time T1 has elapsed while a projector 1 does not receive drawing by an electronic pen during the operation in a drawing mode (step S106: Y), if an electronic pen 40 is not stored in a pen storage part 3 (step S107: N), control means 20 causes image projection means 10 to project a pen storage warning message M1 prompting a user to store the electronic pen 40 (step S108).

Description

The present invention relates to a projector that projects an image, and a projector control method.

When using a projector in a school class, etc., I sometimes wanted to explain by writing letters and figures in the projected image. In this case, in addition to a method of inputting characters and figures by operating a pointing device such as a mouse on the screen of a personal computer (PC / PC) for inputting image data, An apparatus (electronic blackboard system) that operates an electronic pen on an image projected on a screen and writes characters and figures is disclosed. However, in the system of Patent Document 1, since the projector and the electronic pen are handled separately, there is a risk that the electronic pen may be forgotten and lost after the use of the projector is finished.

Patent Document 2 proposes an electronic device (pen input information processing device) that uses an input pen, which holds off the power until the input pen is stored when the power is turned off. According to such a device, it is possible to prevent forgetting to store the input pen when the power is turned off.

JP 2011-140154 A JP 2000-132322 A

However, the projector may not perform drawing or operation with the electronic pen when in use. For this reason, after drawing with the electronic pen during image projection, if only the image was projected without using the electronic pen, it may become difficult to know where the electronic pen was placed when the power was turned off. It was.

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 having an image projecting unit that modulates and projects light emitted from a light source according to image information, and a housing that houses the image projecting unit. The housing includes a pen storage unit that stores an electronic pen, a position detection unit that detects a position indicated by the electronic pen, and generates drawing data based on a detection result of the position detection unit, and a drawing image A drawing means for projecting the image projection means, a pen storage detection means for detecting whether or not the electronic pen is stored in the pen storage section, and an operation by the electronic pen is not detected for a predetermined time. Control means for causing the image projection means to project a message prompting to store the electronic pen if the electronic pen is not stored in the pen storage section. And features.

According to this application example, when the electronic pen is not stored in the pen storage unit and is not used for a while, the projector projects a message prompting the storage, so the electronic pen is stored in the pen storage unit when not in use. It is possible to prevent forgetting and losing.

Application Example 2 In the projector according to the application example described above, when the projector receives a power-off operation, the control unit suspends power-off until the electronic pen is stored in the pen storage unit. It is preferable.

According to this application example, when the electronic pen is not stored in the pen storage unit when the projector is turned off, the power off is suspended, so that the electronic pen is forgotten to be stored and lost when the projector is turned off. Can be prevented.

Application Example 3 In the projector according to the application example described above, mode setting means for setting one of a drawing mode in which drawing with the electronic pen is performed when the projector is used and a normal mode in which drawing with the electronic pen is not performed. The control means further includes a message for prompting the electronic pen to be accommodated when the electronic pen is not accommodated in the pen accommodating portion when the drawing mode is switched to the normal mode. It is preferable to project it.

According to this application example, when the drawing mode in which drawing is performed with the electronic pen is switched to the normal mode in which drawing is not performed, if the electronic pen is not stored in the pen storage unit, the projector projects a message prompting storage. Therefore, it is possible to prevent the electronic pen from being forgotten and lost when switching to the normal mode.

Application Example 4 In the projector according to the application example described above, the mode setting unit detects that the electronic pen is taken out from the pen storage unit while the projector is operating in the normal mode. In addition, it is preferable to switch to the drawing mode.

According to this application example, it is possible to switch to the drawing mode simply by taking out the electronic pen from the pen storage unit during the operation in the normal mode.

Application Example 5 A projector control method according to this application example includes: an image projecting unit that modulates and projects light emitted from a light source according to image information; a housing that houses the image projecting unit;
The projector includes a pen storage unit that stores an electronic pen, a position detection step for detecting a position indicated by the electronic pen, and a detection result detected in the position detection step A drawing step for generating drawing data on the basis of the image, and causing the image projection means to project a drawing image; a pen storage detecting step for detecting whether or not the electronic pen is stored in the pen storage unit; and the electronic pen And a control step of causing the image projection means to project a message prompting to store the electronic pen if the operation by is not detected for a predetermined time and the electronic pen is not stored in the pen storage unit. It is characterized by that.

According to this application example, when the electronic pen is not stored in the pen storage unit and is not used for a while, the projector projects a message prompting the storage, so the electronic pen is stored in the pen storage unit when not in use. It is possible to prevent forgetting and losing.

Explanatory drawing which shows the usage condition of the projector which concerns on embodiment. 1 is an external perspective view of a projector according to an embodiment. The external view of an electronic pen. 1 is a block diagram showing a circuit configuration of a projector according to an embodiment. The schematic diagram for demonstrating a projection image. 6 is a flowchart showing an operation in a drawing mode of the projector. The flowchart which shows operation | movement when a projector receives power-off operation.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The following embodiments do not limit the invention according to the claims,
Not all combinations of features in the embodiments are essential for the solution of the invention.

(Embodiment)
FIG. 1 is an explanatory diagram showing a usage pattern of the projector 1 of the present embodiment. As shown in FIG. 1, the projector 1 is placed on a desk DK and projects an image on the projection screen SC. User H performs a drawing operation using electronic pen 40 on projection surface SC. The projector 1 detects operation information such as a position indicated by the electronic pen 40 by a pen operation detection unit 25 (see FIG. 4) described later. Then, the projector 1 combines the drawing image D1 based on the drawing operation of the electronic pen 40 with the projection image G1, and projects it on the projection screen SC.

FIG. 2 is an external perspective view of the projector 1 according to the present embodiment, as viewed obliquely from the front. In the present embodiment, the description will be made assuming that the direction in which an image is projected is the front.

As shown in FIG. 2, the projector 1 has a housing 2 having an upper surface 2T, a left surface 2L, a front surface 2F, and the like.
An opening is formed in the front surface 2F of the housing 2, and the tip of the projection lens 13 that projects an image onto the projection surface SC (see FIG. 1) is exposed from this opening.

The upper surface 2T of the housing 2 includes a plurality of operation keys, and is provided with input operation means 23 for giving various instructions to the projector 1.

A pen storage unit 3 for storing the electronic pen 40 is formed from a portion of the upper surface 2T of the housing 2 adjacent to the left surface 2L to the left surface 2L, and the pen storage unit 3 can be opened and closed by a pen cover 3A. Although not shown in FIG. 2, the pen storage unit 3 is provided with pen storage detection means 26 (see FIG. 4) so that it can detect whether or not the electronic pen 40 is stored in the pen storage unit 3. It has become.

FIG. 3 is an external view of the electronic pen 40.
As shown in FIG. 3, the electronic pen 40 has a pen-shaped housing 40 </ b> A with a sharp tip, and the housing 40
The tip of A is provided with a nib switch 40B and a light emitting unit 40C that emits infrared light. A pen operation detection unit 25 of the projector 1 described later captures infrared light and detects a position indicated by the electronic pen 40.

FIG. 4 is a block diagram illustrating a circuit configuration of the projector 1 according to the present embodiment. As shown in FIG. 4, the projector 1 includes an image input terminal 6, an image projection unit 10, and an OSD processing unit 16.
, Image signal processing means 17, image signal input means 18, control means 20, storage means 21, light source control means 22, input operation means 23, pen operation detection means 25, pen storage detection means 26, power supply terminal 30, power supply unit 31. These are housed inside or outside the housing 2 (see FIG. 2) of the projector 1.

The image projection means 10 includes a light source 11 and three liquid crystal light valves 12R as light modulators.
12G, 12B, a projection lens 13 as a projection optical system, liquid crystal driving means 14 and the like. The image projection means 10 converts the light emitted from the light source 11 into liquid crystal light valves 12R and 12G.
, 12B and projecting from the projection lens 13, an image is displayed on the projection surface SC or the like.

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

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

In the present embodiment, the projector 1 that projects using the light source lamp 11 a as the light source 11.
However, the present invention can also be applied to a projector that projects using a light emitting diode (LED) light source or a laser light source as a light source.

In the present embodiment, the image projection unit 10 includes three liquid crystal light valves 12R and 12G.
, 12B is used as an example, but a light modulation device of another display system such as a reflective liquid crystal display system or a micromirror device system (light switch display system) may be employed. .

The image signal input means 18 receives image information from a plurality of image input terminals 6 from an external image output device such as a video reproduction device or a personal computer via a cable (not shown) or a communication device. The input image information is output to the image signal processing unit 17 based on an instruction from the control unit 20. Note that the image signal input unit 18 may include a receiving unit for wireless communication, optical communication, or the like, and input an image signal wirelessly from an external device.

The image signal processing unit 17 converts the image information input from the image signal input unit 18 into image information representing the gradation of each pixel of the liquid crystal light valves 12R, 12G, and 12B based on an instruction from the control unit 20. Here, the converted image information is classified into red (R), green (G), and blue (B) color lights, and a plurality of pixels corresponding to all the pixels of the liquid crystal light valves 12R, 12G, and 12B. Consists of values. The pixel value defines the light transmittance of the corresponding pixel, and the intensity (gradation) of light transmitted through each pixel and emitted is defined by this pixel value.

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

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

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

The control means 20 includes a CPU (Central Processing Unit), a RAM (Random Access Memory) used for temporary storage of various data, and the like, and operates according to a control program (not shown) stored in the storage means 21. As a result, the overall operation of the projector 1 is controlled. That is, the control unit 20 functions as a computer together with the storage unit 21. The control unit 20 generates drawing data based on the position information of the electronic pen 40 detected by the pen operation detection unit 25 and stores the drawing data in the storage unit 21. Is also equivalent. The control means 20 includes a timer for measuring time not shown. In addition, the control unit 20 includes a mode setting unit 201 that sets one of a drawing mode for drawing with the electronic pen 40 and a normal mode in which drawing is not performed.

The storage means 21 is composed of a rewritable nonvolatile memory such as a flash memory or FeRAM, a control program for controlling the operation of the projector 1, various setting data for defining the operating conditions of the projector 1, etc. Is remembered. The storage unit 21 stores drawing data by the electronic pen 40 and the like.

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

Although not shown in detail, the input operation unit 23 includes a plurality of operation keys for the user H to give various instructions to the projector 1, and as described above, the outer surface of the housing 2 (see FIG. 2). Placed in.

The operation keys of the input operation means 23 include a power key for alternately switching on / off the power, an input switching key for switching a plurality of image input terminals 6, and a menu for displaying a setting menu in a superimposed manner. Direction keys (four operation keys corresponding to up / down / left / right) used to select an item in the key, setting menu, etc., a decision key for confirming the selected item, a cancel key for canceling the operation, etc., electronic pen 40 And a mode switching key for switching between a drawing mode for drawing by and a normal mode for not drawing.

When the user H operates various operation keys of the input operation unit 23, the input operation unit 23 outputs an operation signal corresponding to the operation content of the user H to the control unit 20. Input operation means 2
3 may be configured to include a remote controller (remote controller) signal receiving means (not shown) and a remote controller (not shown) capable of remote operation. In this case, the remote controller emits an operation signal such as an infrared ray according to the operation content of the user, and the remote control signal receiving means receives it and transmits it to the control means 20 as control information.

The pen operation detection means 25 corresponds to a position detection means, and is composed of an image sensor or the like (not shown). The pen operation detection unit 25 detects and detects a pen operation state such as an operation position (coordinates) of the electronic pen 40 and a pressed state of the pen tip switch 40B (see FIG. 3) based on an instruction from the control unit 20. The pen operation information is notified to the control means 20.

The pen storage detection unit 26 includes a mechanical switch (not shown) and the like, and the control unit 2 indicates a detection result of whether or not the electronic pen 40 is stored in the pen storage unit 3 of the projector 1.
Notify 0. The control unit 20 projects a warning message based on the detection result of the pen storage detection unit 26.

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

Next, a projected image that changes according to the operation of the projector 1 will be described.
FIG. 5 is a schematic diagram for explaining a projected image, and shows an example of each state. Specifically, FIG. 5A is a diagram showing the state in the drawing mode, FIG. 5B is a diagram showing the first warning state, FIG. 5C is a diagram showing the second warning state, and FIG. FIG. 5D is a diagram showing a state in the normal mode, FIG. 5E is a diagram showing a third warning state, and FIG. 5F is a diagram showing a power-off state (standby state).

As shown in FIG. 5A, in the state where the projector 1 is operating in the drawing mode, the projection image G1 is projected on the projection surface SC, and the drawing image D1 is superimposed and drawn by the electronic pen 40. .
In the drawing mode operation state shown in FIG. 5A, when a state in which drawing with the electronic pen 40 is not performed passes a predetermined time T1 (for example, 5 minutes), the electronic pen 40 is stored in the pen storage unit 3. If not, as shown in FIG. 5B, the pen warning message M <b> 1 that makes a transition to the first warning state and prompts the electronic pen 40 to be stored in the pen storage unit 3 is projected.

Further, in the drawing mode operation state of FIG. 5A, when the switching operation to the normal mode by the input operation means 23 is detected, when the electronic pen 40 is not stored in the pen storage unit 3, FIG. As shown in FIG. 5C, the state transits to the second warning state, and when the electronic pen 40 is housed in the pen housing unit 3, the state transits to the normal mode state as shown in FIG. And
In the second warning state, as shown in FIG. 5C, a pen storage warning message M2 that prompts the user to store the electronic pen 40 in the pen storage unit 3 is projected.

Further, in the drawing mode operation state of FIG. 5A, when the power-off operation is detected, if the electronic pen 40 is not stored in the pen storage unit 3, as shown in FIG. Third
When the state transits to the warning state and the electronic pen 40 is housed in the pen housing unit 3, the state transitions to the power-off state as shown in FIG. In the third warning state, as shown in FIG. 5E, a pen storage warning message M3 that prompts the user to store the electronic pen 40 in the pen storage unit 3 is projected.

When the drawing operation by the electronic pen 40 is accepted in the first warning state shown in FIG. 5B or when it is detected that the electronic pen 40 is stored in the pen storage unit 3, the drawing shown in FIG. Return to operating mode.

In the second warning state shown in FIG. 5C, when it is detected that the electronic pen 40 is stored in the pen storage unit 3, the operation state transits to the normal mode operation state shown in FIG.

As shown in FIG. 5D, in the operation mode of the normal mode, the projected image G is projected on the projection surface SC.
1 is projected, and the image drawn by the electronic pen 40 is not projected.
In the normal mode operation state shown in FIG. 5D, when it is detected that the electronic pen 40 has been removed from the pen storage unit 3, the state transitions to the drawing mode operation state shown in FIG. .
Further, when a power-off operation is detected in the normal mode operation state shown in FIG. 5D, the state transits to the power-off state shown in FIG.

In the third warning state shown in FIG. 5E, when it is detected that the electronic pen 40 is stored in the pen storage unit 3, the state transits to the power-off state shown in FIG.

  As shown in FIG. 5F, no image is projected in the power-off state (standby state).

Next, the operation of the projector 1 according to the present embodiment will be described with reference to the flowcharts of FIGS.
FIG. 6 is a flowchart showing the operation of the projector 1 in the drawing mode, and FIG. 7 is a flowchart showing the operation when the projector 1 receives a power-off operation.

[Drawing mode operation]
As shown in FIG. 6, when the projector 1 starts the drawing mode operation (step S
101), the control means 20 starts time measurement by a timer (step S102), and transitions to step S103.

In step S <b> 103, the control unit 20 checks whether the pen operation detection unit 25 has detected a drawing operation by the electronic pen 40. When the drawing operation of the electronic pen 40 is detected (step S103: Y), the process proceeds to step S104. When the drawing operation of the electronic pen 40 is not detected (step S103: N), the process proceeds to step S105. Step S
103 corresponds to a position detection step.

In step S104, the control unit 20 executes a drawing operation based on the position information of the electronic pen 40 detected by the pen operation detection unit 25, and the process proceeds to step S102. Step S1
04 corresponds to a drawing step.

In step S <b> 105, the control unit 20 checks whether or not a switching operation to the normal mode by the input operation unit 23 has been accepted. When the switching operation to the normal mode is accepted (step S105: Y), the process proceeds to step S112. When the switching operation to the normal mode is not received (step S105: N), the process proceeds to step S106.

In step S106, the control means 20 checks whether or not the timer has passed a predetermined time T1. When the timer has passed the time T1 (step S106: Y), the process proceeds to step S107. When the timer has not elapsed time T1 (step S106: N)
) Transitions to step S103.

In step S <b> 107, the control unit 20 checks whether or not the electronic pen 40 is stored in the pen storage unit 3. When the electronic pen 40 is stored in the pen storage unit 3 (step S1)
07: Y), the process proceeds to step S103. When the electronic pen 40 is not stored in the pen storage unit 3 (step S107: N), the process proceeds to step S108. Step S1
07 corresponds to a pen storage detection step.

In step S108, the control means 20 causes the pen storage warning message M1 (FIG. 5B).
Reference) is projected by the image projection means 10, and the process proceeds to step S109. Step S1
Steps S108 to S108 correspond to control steps.

In step S109, the control unit 20 checks whether or not the pen operation detection unit 25 has detected a drawing operation by the electronic pen 40. When the drawing operation of the electronic pen 40 is detected (step S109: Y), the process proceeds to step S111. When the drawing operation of the electronic pen 40 is not detected (step S109: N), the process proceeds to step S110.

In step S <b> 110, the control unit 20 checks whether or not the electronic pen 40 is stored in the pen storage unit 3. When the electronic pen 40 is stored in the pen storage unit 3 (step S1)
10: Y), the process proceeds to step S111. When the electronic pen 40 is not stored in the pen storage unit 3 (step S110: N), the process proceeds to step S109. Step S1
10 corresponds to a pen storage detection step.

In step S111, the control means 20 deletes the pen storage warning message M1, and proceeds to step S102.

In step S112, the control means 20 stops counting by the timer,
Transition to 113.

In step S <b> 113, the control unit 20 checks whether or not the electronic pen 40 is stored in the pen storage unit 3. When the electronic pen 40 is stored in the pen storage unit 3 (step S1)
13: Y), the process proceeds to step S117. When the electronic pen 40 is not stored in the pen storage unit 3 (step S113: N), the process proceeds to step S114.

In step S114, the control means 20 causes the pen storage warning message M2 (FIG. 5C).
Reference) is projected by the image projection means 10, and the process proceeds to step S115.

In step S <b> 115, the control unit 20 checks whether or not the electronic pen 40 is stored in the pen storage unit 3. When the electronic pen 40 is stored in the pen storage unit 3 (step S1)
15: Y), the process proceeds to step S116. When the electronic pen 40 is not stored in the pen storage unit 3 (step S115: N), the process proceeds to step S115.

In step S116, the control means 20 deletes the pen storage warning message M2, and the process proceeds to step S117.

In step S117, the mode setting unit 201 sets the projector 1 to the normal mode and operates it. The operation in the normal mode is not shown, but the electronic pen 4 is in operation
When it is detected that 0 is taken out from the pen storage unit 3, the operation in the drawing mode of FIG. 6 is started (step S101).

[Operation when power-off operation is accepted]
As illustrated in FIG. 7, when a power-off operation is received by the power key of the input operation unit 23 while the projector 1 is operating (step S201), the process proceeds to step S202.

In step S <b> 202, the control unit 20 checks whether or not the electronic pen 40 is stored in the pen storage unit 3. When the electronic pen 40 is stored in the pen storage unit 3 (step S2)
02: Y), the process proceeds to step S205. When the electronic pen 40 is not stored in the pen storage unit 3 (step S202: N), the process proceeds to step S203.

In step S203, the control means 20 causes the pen storage warning message M3 (FIG. 5E).
Reference) is projected by the image projection means 10, and the process proceeds to step S204.

In step S <b> 204, the control unit 20 checks whether or not the electronic pen 40 is stored in the pen storage unit 3. When the electronic pen 40 is stored in the pen storage unit 3 (step S2)
04: Y), the process proceeds to step S205. When the electronic pen 40 is not stored in the pen storage unit 3 (step S204: N), the process proceeds to step S204.

In step S205, the control unit 20 turns off the light source 11 of the projector 1, performs a power-off process for shifting to the standby state, and transitions to step S206.

In step S206, the control unit 20 shifts the projector 1 to the standby state, and ends this operation flow.

According to the embodiment described above, the following effects can be obtained.
According to the projector 1 of the present embodiment, since the electronic pen 40 is not stored in the pen storage unit 3 and the pen storage warning message M1 that prompts storage is projected when the electronic pen 40 is not used for a predetermined time T1, the electronic pen 40 is projected. It is possible to prevent the user from forgetting to store it in the pen storage unit 3 when it is not used and losing it.

If the electronic pen 40 is not stored in the pen storage unit 3 when the projector 1 is turned off, a pen storage warning message M3 is projected and the power-off is suspended until the electronic pen 40 is stored in the pen storage unit 3. Therefore, it is possible to prevent the electronic pen 40 from being forgotten and lost when the projector 1 is powered off.

In addition, when the drawing mode in which drawing is performed with the electronic pen 40 is switched to the normal mode in which drawing is not performed, if the electronic pen 40 is not stored in the pen storage unit 3, a pen storage warning message M2 that prompts storage is projected. When switching to the normal mode, it is possible to prevent the electronic pen 40 from being forgotten and lost.

Further, it is possible to switch to the drawing mode simply by taking out the electronic pen 40 from the pen storage unit 3 during the operation in the normal mode.

The embodiment may be modified as follows.
(Modification 1) You may make it provide the alerting | reporting means which shows whether the electronic pen 40 is accommodated in the pen accommodating part 3 in the housing | casing 2 of the projector 1. FIG.

(Modification 2) Although the projector 1 which accommodates one electronic pen 40 was illustrated in the said embodiment, you may make it accommodate two or more electronic pens. In this case, the pen storage detection unit 26 detects the storage state of each electronic pen 40 and notifies the control unit 20 of it.
(Modification 3) Moreover, although the aspect applied to the projector 1 which projects an image was illustrated in the said embodiment, the technical idea of this invention is not limited to such a projector 1. FIG. For example, the present invention can be applied to a display device that displays an image according to image information. That is,
Since the electronic pen used for the display device is not stored in the predetermined storage unit, it is possible to solve the problem that the electronic pen is lost and lost.
Such a display device is assumed to be a cathode ray tube (CRT), a liquid crystal display, a plasma display, an organic EL display, a head mounted display, or the like.

DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Housing | casing, 3 ... Pen storage part, 3A ... Pen cover, 6 ... Image input terminal, 10 ... Image projection means, 11 ... Light source, 12R, 12G, 12B ... Liquid crystal light valve, 1
DESCRIPTION OF SYMBOLS 3 ... Projection lens, 14 ... Liquid crystal drive means, 16 ... OSD processing means, 17 ... Image signal processing means, 18 ... Image signal input means, 20 ... Control means, 201 ... Mode setting means, 21 ... Storage means, 22 ... Light source Control means, 23 ... input operation means, 25 ... pen operation detection means, 26 ... pen storage detection means, 30 ... power supply terminal, 31 ... power supply unit, 40 ... electronic pen, 40A ... housing, 40B ... pen tip switch, 40C ... light emitting part, G1 ... projected image, D1 ... drawn image, SC ... projection plane.

Claims (5)

A projector having an image projecting unit that modulates and projects light emitted from a light source according to image information, and a housing that houses the image projecting unit,
The housing includes a pen storage unit for storing an electronic pen,
Position detecting means for detecting a position indicated by the electronic pen;
Drawing means for generating drawing data based on the detection result of the position detection means, and causing the image projection means to project a drawing image;
Pen storage detection means for detecting whether or not the electronic pen is stored in the pen storage unit;
A control unit that causes the image projection unit to project a message prompting to store the electronic pen when the operation by the electronic pen is not detected for a predetermined time and the electronic pen is not stored in the pen storage unit; A projector comprising: The projector according to claim 1,
When the projector receives a power-off operation, the control unit suspends power-off until the electronic pen is stored in the pen storage unit. The projector according to claim 1 or 2,
It further comprises mode setting means for setting one of a drawing mode for drawing with the electronic pen when using the projector and a normal mode for not drawing with the electronic pen,
The control unit causes the image projection unit to project a message prompting to store the electronic pen when the electronic pen is not stored in the pen storage unit when the drawing mode is switched to the normal mode. Projector. The projector according to claim 3,
The mode setting means switches to the drawing mode when it is detected that the electronic pen has been removed from the pen storage unit while the projector is operating in the normal mode. A projector control method comprising: an image projection unit that modulates and projects light emitted from a light source according to image information; and a housing that houses the image projection unit,
The housing includes a pen storage unit for storing an electronic pen,
A position detecting step for detecting a position indicated by the electronic pen;
A drawing step of generating drawing data based on the detection result detected in the position detecting step, and causing the image projecting unit to project a drawn image;
A pen storage detection step for detecting whether or not the electronic pen is stored in the pen storage unit;
A control step of causing the image projection means to project a message prompting to store the electronic pen if the operation with the electronic pen is not detected for a predetermined time and the electronic pen is not stored in the pen storage unit; And a projector control method.

Images