JP2017163589A - Projection apparatus and projection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection apparatus surely projecting a video image.SOLUTION: A projection apparatus of an embodiment of the invention includes: content acquisition means of acquiring a content; content output means of outputting the content; projection means of projecting a video image on the basis of the content; request control means of requesting an output start or an output end of the content to the content output means; and notification means of notifying the request control means of the start or the end of switching of the content in response to a switching request of the content from a user. The request control means requests the output end of a first content to first content output means when receiving notification of the switching start of the first content from the notification means, and requests the output start of a second content to second content output means when receiving the notification of the switching end of the first content from the notification means. Thus, the problem mentioned above can be solved.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a projection apparatus and a projection system.

  The projector is a projector that projects an image on a screen when an image signal is input from an external device (input means) such as an external server or a USB memory. Usually, a projector has a plurality of input means for acquiring a video signal necessary for outputting content (still image or moving image). The user arbitrarily selects an input unit from among a plurality of input units, and projects the content existing in the input unit as an image on the screen.

  A projector that automatically starts outputting content existing in an external device in response to a user's selection is already known. In addition, a projector that can separate a system for switching input of a video signal from a system for outputting content existing in an external device is already known.

  Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique for automatically switching television images when a user requests a DVD player to play back content.

  However, conventional projectors have not been able to properly synchronize between a system that switches input means and a system that outputs content existing in the input means.

  For this reason, the conventional projector outputs new content before the switching of the input means is completed (the switching of the current content is completed).

  Therefore, after the end of the switching of the input means, the user has to recognize the video from the middle of output, not the video from the start of output of new content. For example, when the content is a moving image, there is a problem that the user has to recognize the moving image in which the first few seconds are interrupted.

  Also in Patent Document 1, the problem that the first few seconds of the video is interrupted because the video of the television is switched after the reproduction of the content is started cannot be solved.

  SUMMARY An advantage of some aspects of the invention is that it provides a projection apparatus that accurately projects an image.

  In order to achieve the above object, a projection apparatus according to an embodiment of the present invention includes a content acquisition unit that acquires content, a content output unit that outputs content, and content. Based on the projection means for projecting video, the request control means for requesting the content output means to start or end the output of the content, and the request control means in response to the content switching request from the user, A notification means for notifying the start of switching or the end of switching of content, and the request control means, upon receiving notification of the start of switching of the first content from the notification means, to the first content output means, When the end of output of the first content is requested and the notification of the end of switching of the first content is received from the notification means, Against Tsu output means, characterized by requesting an output start of the second content.

  According to the embodiment of the present invention, it is possible to provide a projection apparatus that accurately projects an image.

It is the figure which showed typically schematic structure of the projection system which concerns on Embodiment 1. FIG. It is a figure which shows an example of the sequence in the projection system which concerns on Embodiment 1. FIG. It is a figure which shows an example of the sequence in the projection system which concerns on Embodiment 2. FIG. It is a figure which shows an example of the sequence in the projection system which concerns on Embodiment 3. FIG. It is a figure which shows an example of the sequence in the projection system which concerns on Embodiment 4. FIG. It is a figure which shows an example of the sequence in the projection system which concerns on Embodiment 5. FIG. It is a figure which shows an example of the sequence in the projection system which concerns on Embodiment 6. FIG.

[Embodiment 1]
(Projection system)
FIG. 1 is a diagram schematically showing a schematic configuration of a projection system 110 according to the present embodiment.

  As shown in FIG. 1, the projection system 110 includes a projection apparatus 100 and an external device 106. The projection apparatus 100 and the external device 106 may be connected via a predetermined connection cable or the like. Further, communication may be performed wirelessly without using a connection cable or the like.

  The external device 106 includes a plurality of input means. In this embodiment, a case where an external server 106a and a USB (Universal Serial Bus) memory 106b are used as input means will be described, but the input means is not particularly limited.

  For example, a personal computer, a PDA (Personal Digital Assistant), a digital camera, an external storage, a server connected to a network such as the Internet, or the like may be used as input means.

  Each of the plurality of input means has contents. Each input unit outputs the content to a content acquisition unit included in the projection apparatus. Therefore, the user can project a desired image on the projection device by selecting an input unit including a desired content from a plurality of input units.

  Further, when the user switches the input means, the projection device 100 switches the current content, and after the switching is completed, the projection device 100 can accurately project the user's desired video by outputting the new content. it can.

  The projection apparatus 100 includes a projection unit 101, a content acquisition unit 102, a content output unit 103, a notification unit 104, and a request control unit 105.

  The projection unit 101 obtains an output based on each content existing in a plurality of input units (for example, the external server 106a and the USB memory 106b) included in the external device 106 from the content output unit 103, and based on the output, A light source or the like is used to project or not project an image.

  The content acquisition unit 102 acquires each content existing in the plurality of input units. The content is not particularly limited, and may be a moving image or a still image.

  The content acquisition unit 102 is provided corresponding to each input unit. When one of the input means is the external server 106a, a first content acquisition means 102a is provided corresponding to the external server 106a. The content acquired by the first content acquisition unit 102a is defined as the first content 108a. When one of the input means is the USB memory 106b, a second content acquisition means 102b is provided corresponding to the USB memory 106b. The content acquired by the second content acquisition unit 102b is assumed to be the second content 108b.

  The content output unit 103 outputs or does not output the content acquired from the content acquisition unit 102 based on the request from the request control unit 105.

  Similarly to the content acquisition unit 102, the content output unit 103 is also provided corresponding to each input unit. When one of the input means is the external server 106a, the first content output means 103a is provided corresponding to the external server 106a. When one of the input means is the USB memory 106b, the second content output means 103b is provided corresponding to the USB memory 106b.

  To explain with a specific example, when the first content output means 103a receives the first content 108a output end request from the request control means 105, the first content output means 103a Request to end the acquisition of one content 108a. Further, when the second content output unit 103b receives the second content 108b output start request from the request control unit 105, the second content output unit 103b instructs the second content acquisition unit 102b to start acquiring the second content 108b. Request.

  Further, the first content output unit 103a notifies the request control unit 105 of the end of acquisition of the first content 108a, notifies the projection unit 101 of the end of projection, and ends the projection of the video. The second content output unit 103b notifies the request control unit 105 of the start of acquisition of the second content 108b, notifies the projection unit 101 of the start of projection, and starts projecting the video.

  The notification unit 104 switches the input unit in response to a request for switching the input unit from the user. Specifically, the request control unit 105 is notified of the start of the switching process or the end of the switching process based on the switching request from the user. Since the content can be switched from the first content 108a to the second content 108b by switching the input means, the user may give a switching request to the notification means 104 at a timing when the content is desired to be switched. .

  The request control means 105 requests the content output means 103 to start or end the content output.

  To explain with a specific example, the request control means 105 receives the switching start notification from the notification means 104 and sends the first content 108a (current content) to the first content output means 103a. Request output termination. Further, the request control unit 105 receives the switching end notification from the notification unit 104 and requests the second content output unit 103b to start outputting the second content 108b (new content).

  That is, the request control unit 105 receives the switching start notification or the switching end notification from the notification unit 104 based on the user content switching request, and then outputs the current content output end or a new one to the content output unit 103. Request to start content output.

  Therefore, the projection apparatus 100 can synchronize between the notification unit 104 and the content output unit 103 (for example, the first content output unit 103a and the second content output unit 103b). That is, synchronization can be established between a system that switches input means and a system that outputs content (for example, the first content 108a and the second content 108b) existing in the external device 106. Therefore, the projection apparatus 100 can start outputting new content after waiting for the switching of the input means to end.

  According to projection system 110 according to the present embodiment, even if the user arbitrarily switches the input means, the output of new content is not started while the input means is switched. For this reason, for example, even when the content acquired from the external device 106 is a moving image, it is possible to prevent a problem that the first few seconds of the video are interrupted when the projection device 100 projects the content. That is, according to the system, even if the user arbitrarily switches the input means, the projection apparatus 100 can accurately project the user's desired image.

(Projection system sequence)
An example of a sequence in the projection system 110 according to the present embodiment will be specifically described with reference to FIG.

  The sequence of the projection system 110 includes a sequence 1 to a sequence 13 as shown in FIG.

  Although the number and type of external devices are not particularly limited, as described above, in this embodiment, the external server 106a and the USB memory 106b are used as the external devices.

  Also, a means for acquiring content existing in the external server 106a is referred to as first content acquisition means 102a, and the content is referred to as first content 108a. The means for outputting the first content 108a is referred to as first content output means 103a. Similarly, a means for acquiring content existing in the USB memory 106b is referred to as second content acquisition means 102b, and the content is referred to as second content 108b. The means for outputting the second content 108b is the second content output means 103b.

  First, as a precondition before the start of the sequence, it is assumed that the projection apparatus 100 acquires the first content 108a existing in the external server 106a and projects an image based on the first content 108a.

  Sequence 1: The user requests the notification unit 104 to switch the input unit, that is, switch the input unit from the external server 106a to the USB memory 106b.

  Sequence 2: The notification unit 104 starts input unit switching processing.

  Sequence 3: The notification unit 104 notifies the request control unit 105 that the switching of the input unit is started from the external server 106a to the USB memory 106b based on the switching request from the user.

  Sequence 4: The request control unit 105 requests the first content output unit 103a to end the output of the first content 108a. The request control unit 105 receives the notification of the start of switching the input unit and requests the end of the output of the first content 108a (current content) existing in the external server 106a.

  Sequence 5: The first content output unit 103a requests the first content acquisition unit 102a to end acquisition of the first content 108a. This sequence may be omitted, for example, when the first content 108a is a still image. Once the first content acquisition unit 102a has acquired the content of the still image existing in the external server 106a, the exchange between the first content acquisition unit 102a and the external server 106a is continued thereafter. This is because the projection apparatus 100 can project a still image without it.

  Sequence 6: The first content output unit 103a ends the output of the first content 108a acquired from the first content acquisition unit 102a.

  Sequence 7: The first content output unit 103a notifies the request control unit 105 of the end of output of the first content 108a acquired from the first content acquisition unit 102a. Further, the projection means 101 is notified of the end of projection of the first content 108a.

  Sequence 8: The notification unit 104 notifies the request control unit 105 that the switching of the input unit to the USB memory 106b has been completed from the external server 106a.

  Sequence 9: The request control unit 105 requests the second content output unit 103b to start outputting the second content 108b. The request control unit 105 receives the notification of the end of switching of the input unit and requests the output start of the second content 108b (new content) existing in the USB memory 106b.

  Sequence 10: The second content output unit 103b requests the second content acquisition unit 102b to start acquisition of the second content 108b.

  Sequence 11: The second content acquisition unit 102b acquires the second content 108b existing in the USB memory 106b.

  Sequence 12: The second content output means 103b starts outputting the second content 108b acquired from the second content acquisition means 102b.

  Sequence 13: The second content output unit 103b notifies the request control unit 105 of the start of output of the second content 108b acquired from the second content acquisition unit 102b. In addition, the projection unit 101 is notified of the start of projection of the second content 108b.

  According to the above-described sequence, during the switching of the input means, the request control means 105 requests the first content output means 103a to end the output of the current content, and the second content output means 103b. Is requested to start outputting new contents. Therefore, even when the user arbitrarily switches the input means, the projection apparatus can output new content after waiting for the input means to be switched. That is, in the projection apparatus 100, it is possible to prevent a problem that the first few seconds of the video is interrupted, so that the user recognizes the video from the start of output of new content after the end of the switching of the input means. can do.

[Embodiment 2]
In this embodiment, an example of a sequence different from that in Embodiment 1 will be specifically described with reference to FIG.

  In FIG. 3, the same sequences as those in FIG. 2 are denoted by the same reference numerals, and redundant description is omitted.

  The sequence of the projection system 110 includes a sequence 1 to a sequence 14 as shown in FIG.

  In FIG. 3, it is assumed that an external server 106a and a USB memory 106b are used as external devices.

  Since the sequence 1 to the sequence 7 are the same as those in FIG.

  Sequence 8: The request control unit 105 requests the first content output unit 103a to end the output of the first content 108a existing in the external server 106a, and then requests the second content output unit 103b. The acquisition of the second content 108b existing in the USB memory 106b is requested.

  Sequence 9: The second content output unit 103b requests the second content acquisition unit 102b to start acquisition of the second content 108b.

  Sequence 10: The second content output means 103b acquires the second content 108b existing in the USB memory 106b.

  Sequence 11: The request control unit 105 receives a notification from the second content output unit 103b that acquisition of the second content 108b existing in the USB memory 106b has been completed. Further, the request control unit 105 receives a notification from the notification unit 104 that the switching of the input unit to the USB memory 106b has been completed from the external server 106a.

  Sequence 12: The request control means 105 requests the second content output means 103b to start outputting the second content 108b on the condition that these notifications are received.

  Sequence 13: The second content output unit 103b starts outputting the second content 108b acquired in advance from the second content acquisition unit 102b (see sequences 9 and 10).

  Sequence 14: The second content output unit 103b notifies the request control unit 105 of the output start of the second content 108b acquired from the second content acquisition unit 102b. In addition, the projection unit 101 is notified of the start of projection of the second content 108b.

  According to the above-described sequence, the request control unit 105 requests the second content output unit 103b to start the output of the second content 108b before requesting the second content output unit 103b to output the second content 108b. 2 is requested to start acquisition of the content 108b. For this reason, the projection apparatus 100 can start outputting new content immediately after the switching of the input means is completed.

[Embodiment 3]
In this embodiment, an example of a sequence different from that in Embodiment 1 will be specifically described with reference to FIG.

  4, the same sequences as those in FIG. 2 are denoted by the same reference numerals, and redundant description is omitted.

  The sequence of the projection system 110 includes a sequence 1 to a sequence 16 as shown in FIG.

  In FIG. 4, the external server 106a and the external server 106c set in advance by the user are used as the external devices. Assume that first content output means 103a and first content acquisition means 102a are provided corresponding to the external server 106a. The content acquired by the first content acquisition unit 102a is defined as the first content 108a. In addition, it is assumed that second content output means 103c and second content acquisition means 102c are provided corresponding to the external server 106c. The content acquired by the second content acquisition unit 102c is assumed to be the second content 108c.

  Since the sequence 1 to the sequence 7 are the same as those in FIG.

  Sequence 8: The notification unit 104 notifies the request control unit 105 that the switching of the input unit has been completed.

  Sequence 9: The request control unit 105 requests the second content output unit 103c to start outputting the second content 108c.

  Sequence 10: The second content output unit 103c requests the second content acquisition unit 102c to search for an input unit that is a content acquisition destination. The input means is an external server 106c set in advance by the user.

  Sequence 11: When one of the retrieved input means matches the external server 106c set in advance by the user, the second content output means 103c sends the second content to the second content acquisition means 102c. Request acquisition start of 108c.

  Sequence 12: The second content output unit 103c acquires the second content 108c existing in the external server 106c. Note that information set in advance for the user to specify the external server 106c is not particularly limited. For example, the IP address or server name of the external server 106c is preferably set in advance.

  Sequence 13: The second content output means 103c starts outputting the second content 108c acquired from the second content acquisition means 102c.

  Sequence 14: The second content output means 103c notifies the request control means 105 of the output start of the second content 108c acquired from the second content acquisition means 102c. In addition, the projection unit 101 is notified of the start of projection of the second content 108c.

  Sequence 15: When one of the retrieved input means does not match the external server 106c set in advance by the user, the second content output means 103c starts outputting a list of input means as content acquisition destinations To do. Based on the output, the user selects a desired input means from the list of input means.

  Sequence 16: The second content output means 103c notifies the request control means 105 of the output start of the second content 108c existing in the input means selected by the user. Also, the projection unit 101 is notified of the start of projection of the content.

  In the sequence shown in FIG. 4, similar to the sequence shown in FIG. 2, after the request control means 105 receives the input means switching end notification from the notification means 104, the request control means 105 receives the second content output means 103c. Although the output start of the second content 108c is requested and the second content acquisition unit 102c is requested to start the acquisition of the second content 108c, the present invention is not limited to this sequence. For example, similar to the sequence shown in FIG. 3, the request control means 105 switches the input means from the notification means 104 after requesting the second content output means 103c to start acquiring the second content 108c. Upon receiving the end notification, the second content output unit 103c may be requested to start outputting the second content 108c again.

  According to the above-described sequence, the user sets the input unit as the acquisition destination of the second content 108c in advance, and outputs the second content 108c existing in the input unit, whereby the user acquires the content. It is possible to save the trouble of searching for the destination. In addition, since the content can be automatically acquired from the input means searched based on preset information, the time required for content acquisition can be shortened. Furthermore, since the user can explicitly set the input means in advance, the projection apparatus 100 can project an image suitable for the user's request quickly and accurately.

[Embodiment 4]
In this embodiment, an example of a sequence different from that in Embodiment 1 will be specifically described with reference to FIG.

  In FIG. 5, the same sequence as in FIG.

  The sequence of the projection system 110 includes a sequence 1 to a sequence 16 as shown in FIG.

  In FIG. 5, the external server 106a and the last used external server 106d are used as external devices. Assume that first content output means 103a and first content acquisition means 102a are provided corresponding to the external server 106a. The content acquired by the first content acquisition unit 102a is defined as the first content 108a. Assume that second content output means 103d and second content acquisition means 102d are provided corresponding to the external server 106d. The content acquired by the second content acquisition unit 102d is assumed to be the second content 108d.

  Sequence 1 to sequence 9 are the same as those in FIG.

  Sequence 10: The second content output unit 103d requests the second content acquisition unit 102d to search for an input unit that is a content acquisition destination. The input means is the external server 106d used last time by the second content output means 103d. Note that information for specifying the external server 106d used last time is not particularly limited.

  Sequence 11: When one of the retrieved input means matches the last external server 106d used last time, the second content output means 103d sends the second content 108d to the second content acquisition means 102c. Request start of acquisition.

  Sequence 12: The second content output means 103d acquires the second content 108d existing in the external server 106d.

  Sequence 13: The second content output means 103d starts outputting the second content 108d acquired from the second content acquisition means 102d.

  Sequence 14: The second content output means 103d notifies the request control means 105 of the output start of the second content 108d acquired from the second content acquisition means 102d. In addition, the projection unit 101 is notified of the start of projection of the second content 108d.

  Sequence 15: If one of the retrieved input means does not match the last used external server 106d, the second content output means 103c starts outputting a list of input means that are content acquisition destinations. .

  Sequence 16: The second content output unit 103c notifies the request control unit 105 of the start of output of content existing in the input unit selected by the user. Also, the projection unit 101 is notified of the start of projection of the content.

  In the sequence shown in FIG. 5, similar to the sequence shown in FIG. 2, after the request control means 105 receives the input means switching end notification from the notification means 104, the request control means 105 notifies the second content output means 103e. Although the output start of the second content 108e is requested and the second content acquisition unit 102e is requested to start the acquisition of the second content 108e, the present invention is not limited to this sequence. For example, similar to the sequence shown in FIG. 3, the request control means 105 switches the input means from the notification means 104 after requesting the second content output means 103e to start acquiring the second content 108e. Upon receiving the end notification, the second content output means 103e may be requested to start outputting the second content 108e again.

  According to the above sequence, the last used content can be used by storing the information of the last used external server in the second content output means 103e. Further, it is possible to save the user from searching for a new content acquisition destination, and to shorten the time required to acquire new content.

[Embodiment 5]
In this embodiment, an example of a sequence different from that in Embodiment 1 is specifically described with reference to FIGS.

  In FIG. 6, the same sequences as those in FIG. 4 are denoted by the same reference numerals, and redundant description is omitted.

  The sequence of the projection system 110 includes a sequence 1 to a sequence 14 as shown in FIG.

  In FIG. 6, it is assumed that the external server 106 a and the content acquisition unit use the external server 106 e searched for first time as an external device. Assume that first content output means 103a and first content acquisition means 102a are provided corresponding to the external server 106a. The content acquired by the first content acquisition unit 102a is defined as the first content 108a. Assume that second content output means 103e and second content acquisition means 102e are provided corresponding to the external server 106e. The content acquired by the second content acquisition unit 102e is assumed to be the second content 108e.

  Sequence 1 to sequence 9 are the same as those in FIG.

  Sequence 10: The second content output unit 103e requests the second content acquisition unit 102e to search for an input unit that is a content acquisition destination. The input means is the external server 106e that the second content acquisition means 102c first searches for this time. The second content output means 103e stops the search when searching for one input means as a content acquisition destination. The input means is the external server 106e.

  Sequence 11: The second content output means 103e requests the second content acquisition means 102c to start acquisition of the second content 108e existing in the external server 106e searched for first time this time.

  Sequence 12: The second content output means 103e acquires the second content 108e existing in the external server 106e.

  Sequence 13: The second content output means 103e starts outputting the second content 108e acquired from the second content acquisition means 102e.

  Sequence 14: The second content output unit 103e notifies the request control unit 105 of the output start of the content acquired from the second content acquisition unit 102e. In addition, the projection unit 101 is notified of the start of projection of the second content 108e.

  In the sequence 10, when the second content 108e existing in the external server 106e first searched this time is a content that cannot be output, the next searched external server is set as an input means as a content acquisition destination. To do. By using the content that can be output reliably, the accuracy of the image projected by the projection device can be increased.

  In the sequence 10, the second content output means 103e can also store the information of the content that was last output at the time of the previous output. When the second content acquisition unit 102e starts to acquire content, the second content output unit 103e acquires the content that was last output at the time of the previous output from the second content acquisition unit 102e. It is also possible to request. In this case, the second content output means 103e starts output from the content that was last output during the previous output. The second content output means 103e stores the content that was last output at the time of the previous output, so that the time for reusing the content can be reduced.

  For example, in a presentation using a projection device, an instructor interrupts the explanation during projection of a video, switches to a different video, makes another explanation, then returns to the original video and resumes the explanation. The effect can be exhibited.

[Embodiment 6]
In this embodiment, an example of a sequence different from that in Embodiment 1 will be specifically described with reference to FIG.

  In FIG. 7, the same reference numerals are given to the same sequences as those in FIG.

  The sequence of the projection system 110 includes a sequence 1 to a sequence 14 as shown in FIG.

  In FIG. 7, it is assumed that an external server 106a and a USB memory 106b are used as external devices. As in FIG. 2, a first content output unit 103a, a first content acquisition unit 102a, a second content output unit 103b, and a second content acquisition unit 102b are provided.

  First, as a precondition before the start of the sequence, it is assumed that the projection apparatus 100 acquires the first content 108a existing in the external server 106a and projects a video based on the content.

  Sequence 1: The user requests the notification unit 104 to switch the input unit, that is, switch the input unit from the external server 106a to the USB memory 106b.

  Sequence 2: The notification unit 104 notifies the request control unit 105 that switching of the input unit from the external server 106a to the USB memory 106b is actually started before the input unit switching process is started. To do.

  Sequence 3: The request control unit 105 requests the first content output unit 103a to end the output of the first content 108a.

  Sequence 4: The first content output unit 103a requests the first content acquisition unit 102a to end acquisition of the first content 108a.

  Sequence 5: The first content output means 103a finishes outputting the first content 108a acquired from the first content acquisition means 102a.

  Sequence 6: The first content output unit 103a notifies the request control unit 105 of the end of output of the first content 108a acquired from the first content acquisition unit 102a. Further, the projection means 101 is notified of the end of projection of the first content 108a.

  Sequence 7: The request control means 105 confirms that the preparation for switching is completed with respect to the notification means 104 on condition that the notification of the end of output of the first content 108a is received from the first content output means 103a Notice.

  Sequence 8: The notification unit 104 starts input unit switching processing.

  Sequence 9: The notification unit 104 notifies the request control unit 105 that the switching of the input unit to the USB memory 106b has been completed from the external server 106a.

  The sequence 10 to the sequence 14 are the same as those in FIG.

  According to the above sequence, even if the time required for the switching process of the input means is shorter than the time required to completely output the content existing in the external server 106a, after the switching of the input means, Content existing in the USB memory 106b can be output without fail. Therefore, in such a case, the problem that the content existing in the external server 106a instead of the content existing in the USB memory 106b is output despite the switching of the input means that normally occurs in such a case is solved. be able to.

  The preferred embodiment has been described in detail above. However, the present invention is not limited to the above-described embodiment, and various modifications may be made to the above-described embodiment without departing from the scope described in the claims. And you can make changes.

100 Projector
101 Projection means
102 Content acquisition means
103 Content output means
104 Notification means
105 Request control means
106 External equipment
110 Projection system

JP 2007-067947 A

The present invention relates to a projection apparatus and a projection method .

In order to achieve the above object, a projection apparatus according to an embodiment of the present invention is a projection apparatus that outputs content from an external device, and includes request control means for requesting start or end of content output , and request control. in response to a request from the device, comprising: a notifying means for notifying a switching start or switching completion of content and, when notified of the switching start of the first content from the notification means, the output of the first content When an end is requested and a notice of the end of switching of the first content is received from the notifying means, an output start of the second content is requested.

Claims (9)

Content acquisition means for acquiring content;
Content output means for outputting the content;
Projecting means for projecting video based on the content;
Request control means for requesting the content output means to start or end the output of the content;
A notification unit that receives the content switching request from the user and notifies the request control unit of the content switching start or switching end,
The request control means requests the first content output means to end the output of the first content when receiving notification of the start of switching of the first content from the notification means, and from the notification means A projection apparatus that requests the second content output means to start outputting the second content when receiving a notification of the end of switching of the first content. 2. The projection apparatus according to claim 1, wherein the request control unit requests acquisition of the second content before requesting the second content output unit to start outputting the second content. 2. The projection according to claim 1, wherein the request control unit requests the first content output unit to end output of the first content before receiving notification of the end of switching of the first content. apparatus. An external device containing the content,
Content acquisition means for acquiring the content from the external device;
Content output means for outputting the content;
Projecting means for projecting video based on the content;
Request control means for requesting the content output means to start or end the output of the content;
A notification unit that receives the content switching request from the user and notifies the request control unit of the content switching start or switching end,
The request control means receives the notification of the start of switching the first content, requests the first content output means to end the output of the first content, and completes the switching of the first content. Upon receiving the notification, a projection system that requests the second content output means to start outputting the second content. The projection system according to claim 4, wherein the request control unit requests the second content output unit to acquire the second content before requesting the second content output unit to start outputting the second content. 5. The projection according to claim 4, wherein the request control unit requests the first content output unit to end the output of the first content before receiving a notification of the end of switching of the first content. system. The projection system according to claim 4, wherein the second content is acquired from the external device set in advance by a user. The projection system according to claim 4, wherein the second content is acquired by the user from the external device last used last time. The projection system according to any one of claims 4 to 6, wherein the second content is acquired from the external device that is first searched by the user this time.

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