JP2007259395A - Mobile display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology of enhancing position detection accuracy of a display arm. <P>SOLUTION: Light emitting sections 37a, 37b are provided to the display arm, and light receiving sensors 37c to 37f are provided to the inner side of a container case 31 of an arm support section 30 opposed to the light emitting sections 37a, 37b. Whether or not the display arm 27 is present in the vicinity of a projected position c is detected by receiving light emitted from the light emitting sections 37a, 37b by the light receiving sensors 37c to 37f. Since the light receiving sensors 37c to 37f detect direct light from the light emitting sections 37a, 37b moved to a facing position, high positional accuracy of the display arm 27 is obtained without possibility of an erroneous detection. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a portable display device that is used by being mounted on a user's head.

  2. Description of the Related Art Conventionally, as a portable display device that is worn on a user's head and used, a device called a near-eye display or a head-mounted display such as the device described in Patent Document 1 is known (Patent Document 1). reference).

  In this apparatus, the display arm that supports the display unit is slidably held, and the display arm can be advanced to a position where an image is observed. Further, when the image is not observed, the display arm can be retracted so that the display arm is accommodated in the accommodating portion. In this apparatus, the display arm can be moved forward or backward by the driving force of the display arm driving system, and a position detection sensor is provided to detect the position of the display arm.

JP 2005-215393 A

  For example, when a reflection type photosensor that detects light reflected by the reflection plate is used as the position detection sensor, the reflection type photosensor erroneously detects due to the influence of reflected light from a portion where the reflection plate is not installed. There is a fear.

(1) A portable display device according to the invention of claim 1 includes an image display unit for displaying an image, a display arm to which the image display unit is attached, an arm support unit for movably supporting the display arm, and arm support A case in which the light emitting portion is provided, a light emitting portion that is provided in the display arm and moves together with the display arm, and one or more light receiving portions that are provided in the case and detect light emitted from the light emitting portion. And
(2) The invention of claim 2 is the portable display device according to claim 1, wherein the display arm is movable between the extended position extended from the case and the retracted position accommodated in the case. The light receiving unit is supported by the arm support unit, and at least two light receiving units are provided. At least one light receiving unit among the light receiving units is emitted from the light emitting unit when the display arm is extended near the extended position including the extended position. It is characterized by detecting light.
(3) A third aspect of the present invention is the portable display device according to the second aspect, wherein the feeding device has a power source for feeding the display arm out of the case, and the control for controlling the feeding device based on the detection result of the light receiving unit. The apparatus further comprises means.
(4) According to a fourth aspect of the present invention, in the portable display device according to the third aspect, the control means permits the display arm to be extended by the supply device based on the detection result of the light receiving unit, or the display arm by an external force. It is characterized in that it is determined whether or not to permit movement, and the feeding device is controlled.
(5) According to a fifth aspect of the present invention, in the portable display device according to the third aspect, the control means controls the feeding device so as to change the feeding speed of the display arm based on the detection result of the light receiving unit. It is characterized by.
(6) The invention according to claim 6 is the portable display device according to claim 1, wherein the light emitting unit irradiates a light receiving region of the light receiving unit and a region around the light receiving region.
(7) According to a seventh aspect of the present invention, in the portable display device according to the third aspect, the light emitting section is provided at two positions with a predetermined distance from the display arm along the extending direction. To do.
(8) The invention of claim 8 is the portable display device according to any one of claims 1 to 7, further comprising a mounting device for mounting on the user's head.

  According to the present invention, the position of the display arm can be reliably detected.

  Hereinafter, an embodiment of a portable display device according to the present invention will be described.

  FIG. 1 is a perspective view of a near-eye display system including a portable display device (near-eye display device) 20 and headphones 10 according to the present embodiment.

  The headphone 10 includes left and right speakers 11L and 11R and an arm 12 that connects the left and right speakers 11L and 11R. Both ends of the arm 12 are curved so as to be hung on the left and right ears of the user, and form ear hooks 13L and 13R. The headphone 10 is a rear arm type headphone that turns the arm 12 to the back of the user's head.

  The near-eye display device 20 of the present embodiment includes an image display unit 21 that displays an image in front of the user's eyes, a display arm 27 to which the image display unit 21 is attached at one end, and the display arm 27. An arm support portion 30 that is slidably supported, and an attachment 40 that can attach the arm support portion 30 to the headphone arm 12 are provided.

  2 and FIG. 3 are cutaway plan views of the main part of the near-eye display device of the present embodiment. FIG. 2 shows a state in which the display arm 27 is located at the protruding position c, and FIG. The state located in the retreat position d is shown. FIG. 4 is a diagram schematically showing the inside of the arm support portion 30 when the image display portion 21 is located at the retracted position d.

  The display arm 27 has a hollow bar shape that is smoothly curved with a constant radius of curvature R, and the center of curvature of the display arm 27 is the head H when the near-eye display device 20 is mounted on the user's head H. It comes to exist in. A flexible printed circuit board 29 for exchanging electrical signals between an image processing unit and control unit (to be described later) and the image display unit 21 is inserted into the space of the central portion of the display arm 27. At the other end of the display arm 27, light emitting portions 37a and 37b that emit light toward the outer peripheral side of the display arm 27 are provided. The light emitting units 37 a and 37 b are arranged at intervals along the moving direction of the display arm 27.

  The display arm 27 is configured such that the image display unit 21 is located between a retracted position d (FIG. 3) that fits in the arm support 30 and a projecting position c (FIGS. 1 and 2) that protrudes most from the arm support 30. The arm support 30 supports the display arm 27 so as to move along a locus B corresponding to the curved shape of the display arm 27.

  Further, when the display arm 27 exists in the vicinity of the protruding position c, the image display unit 21 has a displayable position a where the display screen of the image display unit 21 faces the user's eyes, and this display screen is the user's eyes. It is attached to the end of the display arm 27 so as to be swingable in the direction of arrow A between the non-display position b tilted by a certain angle or more with respect to the viewing direction.

  The image display unit 21 includes a display device 22, an optical system 23 for guiding an image displayed by the display device 22 to the user's eyes, and the image display unit 21 at the displayable position or the non-display position. It has the display part position detection sensor 24 which detects whether there exists, and the display case 25 which accommodates these (FIGS. 2, 3). The display case 25 is formed with an attachment portion 26 attached to the end of the display arm 27. The display unit position detection sensor 24 is a magnetic sensor and detects whether the image display unit 21 is a displayable position or a non-display position based on a change in the relative position of the display arm 27 entering the display case 25.

  The arm support unit 30 includes a storage case 31 in which an internal space in which the display arm 27 can be stored is formed, guide rollers 34 a and 34 b that support the display arm 27 so as to be slidable, and a drive roller 35 a that slides the display arm 27. And an arm drive motor 35b for rotating the drive roller 35a and light receiving sensors 37c to 37f. The arm support unit 30 has an arm drive switch 36 for instructing the operation of the arm drive motor 35b.

  The light receiving sensors 37c to 37f are provided inside the storage case 31 so as to face the light emitting portions 37a and 37b provided on the display arm 27 (FIG. 4). The light receiving sensor (retraction detection sensor) 37c detects whether the display arm 27 exists at the retraction position d by detecting light emitted from the light emitting units 37a and 37b. The light receiving sensors (protrusion position detection sensors) 37d to 37f detect whether or not the display arm 27 exists in the vicinity of the above-described protrusion position c. The protruding position detection sensors 37d to 37f are arranged at intervals along the moving direction of the display arm 27.

  The internal space of the storage case 31 is curved corresponding to the curved shape of the display arm 27. As shown in FIG. 4, the inner surface 31a of the storage case 31 is provided with an antireflection coating 31b so as not to reflect light emitted from the light emitting portions 37a and 37b. An antireflection sheet may be attached instead of the antireflection coating 31b. The arm drive switch 36 and the sensors 37c to 37f are arranged so as to be embedded in the storage case 31 so that the portion facing the internal space of the storage case 31 does not protrude from the inner surface 31a of the storage case 31. The flexible printed circuit board 29 exposed from the other end of the display arm 27 to the inside of the arm support 30 is sandwiched between sheet members 291 and 292 having a low friction coefficient.

  An arm insertion port 32 through which the display arm 27 enters and exits is formed on one end (hereinafter referred to as a front end) side of the storage case 31, and an escape portion 33 is provided on the other end (hereinafter referred to as a rear end) side. Is formed. The escape portion 33 extends in a direction away from the headphone arm 12 in order to avoid interference between the speaker 11L or 11R of the headphone 10 and the storage case 31 when the attachment 40 is coupled to the headphone arm 12. It is a part. In the vicinity of the arm insertion opening 32 of the storage case 31, a pair of guide rollers 34 a and 34 b are provided at positions along the movement path B of the display arm 27 so as to sandwich the display arm 27. The driving roller 35a is provided between the guide roller 34a on the front end side and the guide roller 34b on the rear end side, and is provided on the inner peripheral side of the curved display arm 27, in other words, on the user's head side. It has been.

  As shown in FIGS. 2 and 3, a displacement mechanism 50 is provided in the escape portion 33 of the storage case 31. The displacement mechanism 50 changes the relative position and orientation of the image display unit 21 with respect to the attachment 40, and the ball 51 provided on the attachment 40 and the ball receiving unit 52 formed on the escape portion 33 of the storage case 31. And is configured. A certain amount of frictional force acts between the ball 51 and the ball receiving portion 52. Unless a certain amount of rotational force acts on the ball receiving portion 52, Thus, the ball receiving portion 52 cannot be rotated relatively.

  Moreover, a to-be-attached part may be formed in the left and right speakers of the headphones, and the near-eye display device may be attached to each of the left and right to-be-attached parts. The attached portion may be on the side opposite to the ear contact side of the speaker. And the above displacement mechanism 50 may be provided between such an attachment and a storage case.

  FIG. 5 is a circuit configuration diagram of the near-eye display system.

  The storage case 31 of the arm support unit 30 includes the above-described drive roller 35a, arm drive motor 35b, retraction detection sensor 37c, protrusion position detection sensors 37d to 37f, arm drive switch 36, control unit 38, and image. And a processing unit 39. Further, as described above, the display arm 27 is provided with the light emitting portions 37a and 37b. The control unit 38 controls the arm drive motor 35b and the light emitting units 37a and 37b according to signals from the sensors 24 and 37c to 37f and the arm drive switch 36. The image processing unit 39 transmits an image signal to the display device 22 of the image display unit 21 in accordance with a signal from the external controller C.

  Note that an audio signal may be sent from the external controller C to the headphones 10 via a unique signal line, but an audio signal may be sent from the external controller C to the headphones 10 via the near-eye display device 20.

  Next, the operation of the near-eye display device 20 in this embodiment and the operation at that time will be described.

  First, the headphone 10 combined with the near-eye display device 20 is attached to the head. At this time, the near-eye display device 20 has the image display unit 21 at the non-display position b and the display arm 27 at the retreat position d, as shown in FIG.

  When the arm drive switch 36 of the near-eye display device 20 is pressed, an on / off signal from the arm drive switch 36 is output to the control unit 38. When receiving the ON / OFF signal from the arm drive switch 36, the control unit 38 controls the light emitting units 37a and 37b and the light receiving sensors 37c to 37f to supply power, and causes the light emitting units 37a and 37b to emit light. The control unit 38 outputs an arm drive control signal to the arm drive motor 35b to drive the arm drive motor 35b. As a result, the display arm 27 is drawn out and begins to protrude, resulting in the state shown in FIG. The control mode of the arm drive motor 35b by the control unit 38 at this time is called a drive mode.

  In FIG. 6 and FIGS. 7 to 10 described later, the inside of the arm support portion 30 is schematically shown, and the description of the headphones 10 and the like is omitted. 6 to 10, ranges 371a and 371b indicated by broken lines from the light emitting units 37a and 37b to the right side of the drawing are irradiation ranges of light emitted from the light emitting units 37a and 37b. The respective irradiation ranges 371a and 371b are separated from each other on the inner surface 31a of the storage case 31 so as not to overlap each other. This is because detection signals are output from the sensors 37c to 37f by the light emitted from the light emitting units 37a and 37b when the light emitting units 37a and 37b moving together with the display arm 27 pass in the vicinity of the sensors 37c to 37f. This is to make it happen.

  Moreover, the irradiation area in the inner surface 31a of the storage case 31 of each irradiation range 371a, 371b is set so that it may become larger than the light-receiving area | region (not shown) of each sensor 37c-37f arrange | positioned. That is, when the light emitting units 37a and 37b and the sensors 37c to 37f are closest to each other, the light emitted from the light emitting units 37a and 37b irradiates the light receiving areas of the sensors 37c to 37f and the area around the light receiving areas. . This is because the light emitted from the light emitting portions 37a and 37b even if the directions of the light emitting portions 37a and 37b are shifted due to the rattling of the display arm 27 caused by the gap between the guide rollers 34a and 34b and the display arm 27. This is because each of the sensors 37c to 37f is surely detected. The effective irradiation area of the light emitting units 37a and 37b is set to be narrower than the arrangement pitch of the light receiving sensors 37c to 37f. This prevents erroneous position detection.

  When the display arm 27 is extended and the irradiation range 371b of the light emitting portion 37b reaches the protruding position detecting sensor 37d as shown in FIG. 7, that is, when the light emitted from the light emitting portion 37b is received by the protruding position detecting sensor 37d, the protruding portion is protruded. The position detection sensor 37d transmits a detection signal to the control unit 38. When receiving the detection signal from the protrusion position detection sensor 37d, the control unit 38 outputs an arm drive control signal to the arm drive motor 35b so as to drive the arm drive motor 35b at a reduced speed. That is, the drive speed of the arm drive motor 35b can be changed in the drive mode. Thereby, although the protrusion speed of the display arm 27 is decelerated, the drawing-out of the display arm 27 is continued.

  When the display arm 27 is further extended, the irradiation range 371b of the light emitting unit 37b is once removed from the light receiving region of the protruding position detection sensor 37d. Immediately thereafter, as shown in FIG. 8, when the irradiation range 371a of the light emitting portion 37a reaches the protruding position detecting sensor 37d, that is, when the light emitted from the light emitting portion 37a is received by the protruding position detecting sensor 37d, the protruding position detecting sensor 37d. Transmits the detection signal to the control unit 38 again.

  Upon receiving the second detection signal from the protrusion position detection sensor 37d, the control unit 38 outputs an arm drive control signal to the arm drive motor 35b so as to electrically apply a brake and stop the arm drive motor 35b. The control mode of the arm drive motor 35b by the controller 38 at this time is called a brake mode. After shifting to the brake mode and elapse of a predetermined time, the electric brake is released, and an arm drive control signal is output so that the arm drive motor 35b can be rotated by an external force. The control mode of the arm drive motor 35b by the control unit 38 at this time is referred to as a free mode. As a result, as shown in FIG. 8, the display arm 27 stops at the position where the light emitting portion 37a and the protruding position detection sensor 37d face each other, but the user holds the display arm 27 and applies a force in the longitudinal direction. The display arm 27 can be moved to an arbitrary position.

  That is, when receiving the first detection signal from the protrusion position detection sensor 37d, the control unit 38 decelerates the arm drive motor 35b, and when receiving the second detection signal from the protrusion position detection sensor 37d, The brake is applied and the arm drive motor 35b is stopped. The controller 38 releases the electric brake after the arm drive motor 35b is stopped. In the above description, the control unit 38 controls the arm drive motor 35b based on the detection signal from the protrusion position detection sensor 37d, but the detection signal from the protrusion position detection sensor 37e or the protrusion position detection sensor 37f. The same control can be performed based on the above. Which of the protruding position detection sensors 37d to 37f controls the above-described arm drive motor 35b is configured to be selected by a predetermined setting operation by the user. When the operation of extending the display arm 27 is completed in this manner, the control unit 38 stops supplying power to the light emitting units 37a and 37b and the light receiving sensors 37c to 37f. In this way, power saving can be achieved.

  For example, when it is set to control the arm drive motor 35b described above based on the detection signal of the protruding position detection sensor 37e, the arm drive switch 36 is turned on when the display arm 27 is in the retracted position d. When pressed, the display arm 27 protrudes and stops to a position where the light emitting portion 37a and the protruding position detection sensor 37e face each other. When it is set to control the above-described arm drive motor 35b based on the detection signal of the protruding position detection sensor 37f, the arm drive switch 36 is pressed when the display arm 27 is in the retracted position d. Then, the display arm 27 protrudes to a position where the light emitting portion 37a and the protrusion position detection sensor 37f face each other (the protrusion position c described above) and stops.

  As described above, when the arm drive switch 36 is pressed while the display arm 27 is in the retracted position d, any one of the position detection sensors 37d to 37f selected in advance and the light emitting unit 37a. The display arm 27 protrudes to a position where the two face each other, that is, near the protruding position c, and stops. Further, the display arm 27 can be manually moved from the stop position to an arbitrary position in the longitudinal direction of the display arm 27.

  Therefore, the user appropriately sets which of the protruding position detection sensors 37d to 37f performs the control of the arm drive motor 35b described above, so that the user can press the image display unit 21 with a single pressing operation of the arm drive switch 36. The display arm 27 can be protruded to the vicinity of the position where the is used. Thereby, the difference in the head shape for each user can be absorbed, the amount of protrusion of the display arm 27 can be made appropriate, and the amount of manual movement can be reduced during fine adjustment of the amount of protrusion of the display arm 27 performed manually.

  After the display arm 27 is projected to the vicinity of the projecting position c as described above, the image display unit 21 is manually moved from the non-display position b to the displayable position a as shown in FIGS. The position change sensor 24 detects this change in position and outputs a signal to the control unit 38. When receiving a signal from the display unit position detection sensor 24, the control unit 38 transmits a signal indicating that the image display unit 21 has reached the displayable position a to the external controller C and the image processing unit 39. When receiving the signal output from the control unit 38, the image processing unit 39 turns on the backlight of the image display unit 21 and outputs a signal to the image display unit 21 so as to display a video.

  The external controller C recognizes that the near-eye display device 20 is ready to output an image signal by receiving the signal output from the control unit 38. When the reproduction button of the external controller C is pressed here, an image signal is sent from the external controller C to the image processing unit 39, and an image signal is sent from the image processing unit 39 to the display device 22 of the image display unit 21, An image based on this image signal is reproduced.

  When the playback button of the external controller C is pressed, an audio signal is output from the external controller C to the speakers 11L and 11R of the headphones 10. As described above, instead of pressing the arm drive switch 36, the external controller C first transmits an arm drive control signal to the control unit 38 by pressing the playback button of the external controller C, and the series of the above-described series of operations. You may make it perform operation | movement.

  When stopping the image reproduction, the external controller C stops the reproduction, and the display arm 27 is manually moved from the vicinity of the protruding position c to the retracted position d. Then, the arm drive motor 35 detects this movement and outputs a signal to the control unit 38. And the control part 38 is controlled to supply electric power to the light emission parts 37a and 37b and the light reception sensors 37c-37f, and drives the light emission parts 37a, 37b and the light reception sensors 37c-37. When receiving a signal from the light receiving sensor 37c, the control unit 38 transmits a signal indicating that the image display unit 21 has reached the retracted position d to the external controller C and the image processing unit 39. When receiving the signal output from the control unit 38, the image processing unit 39 outputs a signal to the image display unit 21 so that the backlight of the image display unit 21 is turned off. The external controller C stops transmitting the video signal by receiving the signal output from the control unit 38. Note that the transmission of the audio signal from the external controller C is continued regardless of the positions of the image display unit 21 and the display arm 27.

  On the other hand, when the display arm 27 is retracted to the retracted position d automatically instead of manually, when the arm drive switch 36 of the near-eye display device 20 is pressed, an on / off signal from the arm drive switch 36 is output to the control unit 38. Is done. When receiving the on / off signal from the arm drive switch 36, the control unit 38 controls the light emitting units 37a and 37b and the light receiving sensors 37c to 37f to supply power, and controls the light emitting units 37a and 37b and the light receiving sensors 37c to 37. Drive. The control unit 38 outputs a signal to the image processing unit 39 so that the image display unit 21 displays that the display arm 27 is retracted. After a predetermined time, the control unit 38 outputs an arm drive control signal to the arm drive motor 35b, and drives the arm drive motor 35b to retract the display arm 27. As a result, the display arm 27 starts to retract.

  When the display arm 27 is retracted and the irradiation range 371a of the light emitting unit 37a reaches the retreat detecting sensor 37c as shown in FIG. 9, that is, when the light emitted from the light emitting unit 37a is received by the retreat detecting sensor 37c, the retreat detecting sensor. 37 c transmits a detection signal to the control unit 38. When receiving the detection signal from the retraction detection sensor 37c, the control unit 38 outputs an arm drive control signal to the arm drive motor 35b so as to drive the arm drive motor 35b at a reduced speed. As a result, the retracting speed of the display arm 27 is reduced, but the retracting of the display arm 27 is continued.

  When the display arm 27 is further retracted, the irradiation range 371a of the light emitting portion 37a is removed from the light receiving region of the retract detection sensor 37c. After that, as shown in FIG. 10, when the irradiation range 371b of the light emitting unit 37b reaches the retraction detection sensor 37c, that is, when the retraction detection sensor 37c receives light emitted from the light emission unit 37b, the retraction detection sensor 37c again outputs a detection signal. It transmits to the control part 38.

  When receiving the second detection signal from the retraction detection sensor 37c, the control unit 38 outputs an arm drive control signal to the arm drive motor 35b so as to electrically apply a brake and stop the arm drive motor 35b. Note that, after a predetermined time has elapsed, the electric brake may be released, and the arm drive control signal may be output so that the arm drive motor 35b can be rotated by an external force. Thereby, as shown in FIG. 10, the display arm 27 stops at the position where the light emitting portion 37b and the retreat detection sensor 37c face each other, that is, at the retreat position d.

  Further, when receiving the second detection signal from the retraction detection sensor 37c, the control unit 38 outputs a signal indicating that the display arm 27 has reached the retraction position d to the image processing unit 39 and the external controller C. If the image display unit 21 is still set at the displayable position a, it is impossible to electrically retreat. On the other hand, when the display arm 27 is retracted to the retracted position d by being manually pushed, the image processing unit 39 receives a signal from the control unit 38 indicating that the display arm 27 has reached the retracted position d. A signal is output to the image display unit 21 so that the backlight of 21 is turned off. The external controller C stops the transmission of the video signal by receiving a signal from the control unit 38 indicating that the display arm 27 has reached the retreat position d.

The near-eye display system provided with the near-eye display device 20 and the headphones 10 of the present embodiment described above has the following operational effects.
(1) The display arm 27 is provided with light emitting portions 37 a and 37 b, and light receiving sensors 37 c to 37 f for detecting light emitted from the light emitting portions 37 a and 37 b are provided inside the storage case 31 of the arm support portion 30. Unlike this embodiment, for example, in the case of using a reflective photosensor that detects light reflected by the reflector, it is affected by the reflected light from the portion where the reflector is not installed, and the reflective photosensor. There is a risk of false detection. On the other hand, in the present embodiment, since the direct light of the light emitting units 37a and 37b that have moved to the facing position is detected by the light receiving sensors 37c to 37f, there is little risk of erroneous detection, and the position of the display arm 27 is ensured. Can be detected.

(2) The light receiving sensors 37d to 37f that detect a plurality of protruding positions are provided, and the light emitted from the light emitting portions 37a and 37b is detected when the display arm 27 protrudes in the vicinity of the protruding position c. Therefore, the stop position after the display arm 27 is protruded can be appropriately set according to the arrangement position of the light receiving sensors 37d to 37f that detect the protrusion position. As a result, the difference in the head shape of each user can be absorbed, the amount of protrusion of the display arm 27 can be made appropriate, and the amount of manual movement can be reduced during fine adjustment of the amount of protrusion of the display arm 27 performed manually. Convenience is high.

(3) The control unit 38 controls the drive of the arm drive motor 35b based on the detection results of the light receiving sensors 37d to 37f that detect the protruding position by using the power of the arm drive motor 35b to extend the display arm 27. Configured. Thereby, the feeding position (feeding amount) of the display arm 27 can be optimized.

(4) The control unit 38 is configured to determine the control mode of the arm drive motor 35b based on the detection results of the light receiving sensors 37d to 37f that detect the protruding position. Thereby, after the display arm 27 is extended by the driving force of the arm drive motor 35b to a certain extension position and the display arm 27 is stopped, the amount of extension of the display arm 27 can be finely adjusted manually. Position adjustment of the display unit 21 is easy.

(5) The control unit 38 is configured to be able to change the drive speed of the arm drive motor 35b based on the detection results of the light receiving sensors 37d to 37f that detect the protruding position. As a result, the display arm 27 can be quickly extended and the stop position accuracy can be improved.

(6) The projection areas of the irradiation ranges 371 a and 371 b on the inner surface 31 a of the storage case 31 are configured to be wider than the light receiving areas of the sensors 37 c to 37 f disposed on the inner surface 31 a of the storage case 31. As a result, even if the display arm 27 rattles due to the gap between the guide rollers 34a and 34b and the grooves 28a and 28b of the display arm 27, the respective light emitted from the light emitting portions 37a and 37b is emitted from the sensors 37c. It is possible to detect reliably at ˜37f, and the display arm 27 can be reliably stopped at a predetermined position.

(7) The light emitting portions 37a and 37b are arranged at intervals along the moving direction of the display arm 27. Therefore, the sensors 37c to 37f detect light emitted from the light emitting units 37a and 37b as the display arm 27 moves. Thereby, since the control part 38 can control the drive of the arm drive motor 35b according to the output frequency of the detection signal output from each sensor 37c-37f, the precision of the stop position of the display arm 27 can be improved.

(8) Since the near-eye display device 20 is attached to the headphone arm 12 so that the near-eye display device 20 can be worn and used on the user's head, the user can display it on the image display unit 21 regardless of the place of use or use situation. It is possible to see the displayed image and it is convenient.

---- Modified example ---
(1) In the above description, the control unit 38 decelerates the arm drive motor 35b when receiving the first detection signal from any of the preset protruding position detection sensors 37d to 37f. Moreover, when the control part 38 receives the detection signal of the 2nd time from the protrusion position detection sensors 37d-37f, it applies the brake electrically and stops the arm drive motor 35b. However, the present invention is not limited to this. For example, the control unit 38 may control the arm drive motor 35b as follows.

  When the arm drive switch 36 is pressed while the display arm 27 is in the retracted position d, the control unit 38 drives the arm drive motor 35b in the drive mode. When the control unit 38 receives the first detection signal from the light receiving sensors 37d to 37f that detect one of the preset protruding positions, the arm driving motor 35b is decelerated, and then the arm driving switch 36 is pressed again. Until the arm drive motor 35b continues to be driven.

  That is, when the control unit 38 receives the first detection signal from any one of the preset protruding position detection sensors 37d to 37f, the light receiving sensor that decelerates the arm drive motor 35b and then detects the same protruding position. Even if the second detection signals from 37d to 37f are received, the arm drive motor 35b is not stopped. When the arm drive switch 36 is pressed while the arm drive motor 35b is being decelerated and driven, the control unit 38 sets the control mode of the arm drive motor 35b to the brake mode and stops the arm drive motor 35b. After the transition to the brake mode and the elapse of a predetermined time, the control unit 38 sets the control mode of the arm drive motor 35b to the free mode.

  Further, the control unit 38 may control the arm drive motor 35b as follows. When the arm drive switch 36 is pressed while the display arm 27 is in the retracted position d, the control unit 38 drives the arm drive motor 35b in the drive mode. Upon receiving the first detection signal from the light receiving sensors 37d to 37f that detect any one of the preset protruding positions, the control unit 38 sets the control mode of the arm drive motor 35b to the brake mode and stops the arm drive motor 35b. Let

  Thereafter, when the arm drive switch 36 is pressed, the control unit 38 drives the arm drive motor 35b at a lower speed than before while the arm drive switch 36 is pressed. When the arm drive switch 36 is no longer pressed, the control unit 38 sets the control mode of the arm drive motor 35b to the brake mode and stops the arm drive motor 35b. Note that, after the transition to the brake mode and a predetermined time has elapsed, the control unit 38 may set the control mode of the arm drive motor 35b to the free mode.

  In the case where the control unit 38 controls the arm drive motor 35b as in the above modification, only one light emitting unit may be provided in the display arm 27 as shown in FIG. At this time, if light is received by any one of the light receiving sensors 37c to 37f, the brake mode may be immediately started. After that, the free mode may be set after a certain time has elapsed.

(2) In the above description, the light receiving sensors 37c to 37f and the light emitting units 37a and 37b are provided to face each other, but the present invention is not limited to this. Even if the light receiving sensors 37c to 37f and the light emitting portions 37a and 37b are not provided to face each other, the light emitted from the light emitting portions 37a and 37b, such as a light guide rod made of a transparent member or an optical fiber, is used. You may comprise so that the light which the light emission parts 37a and 37b emit can be received with the light-receiving sensor 37c-37f using the member to guide | induced.

(3) You may combine each embodiment and modification which were mentioned above, respectively. For example, the present invention may be applied to a portable display device that automatically displays the display arm by retracting the display device when the remaining amount of power is low.

  In addition, this invention is not limited to the thing of embodiment mentioned above at all, The light emission part which is provided in a display arm and moves with a display arm, and 1 or more which detects the light which is provided in a case and a light emission part emits And various types of portable display devices including the light receiving unit.

It is a perspective view of the near eye display system as one embodiment concerning the present invention. It is a principal part notched top view of the near-eye display system (state of a protrusion position) as one Embodiment concerning this invention. It is a principal part notched top view of the near eye display system (state of a retracted position) as one Embodiment concerning this invention. It is the figure which showed typically the inside of the arm support part 30 when the image display part 21 is located in the retracted position d. It is a circuit block diagram of the near eye display apparatus as one embodiment concerning the present invention. It is the figure which showed typically the inside of the arm support part 30 when the display arm 27 is extended | drawn out. It is the figure which showed typically the inside of the arm support part 30 when the irradiation range 371b of the light emission part 37b reaches | attains the protrusion position detection sensor 37d. It is the figure which showed typically the inside of the arm support part 30 when the irradiation range 371a of the light emission part 37a reaches | attains the protrusion position detection sensor 37d. It is the figure which showed typically the inside of the arm support part 30 when the display arm 27 retract | saves and the irradiation range 371a of the light emission part 37a reaches | attains the retraction | saving detection sensor 37c. It is the figure which showed typically the inside of the arm support part 30 when the irradiation range 371b of the light emission part 37b reaches | attains the retraction | saving detection sensor 37c. It is a figure which shows a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Headphone 12 Arm 20 Near eye display apparatus 21 Image display part 27 Display arm 30 Arm support part 31 Storage case 35b Arm drive motor 36 Arm drive switch 37a, 37b Light emission part 37c Light reception sensor (retraction | saving detection sensor)
37d to 37f Light receiving sensor (projection position detection sensor)
38 Control unit 39 Image processing unit

Claims (8)

An image display unit for displaying an image;
A display arm to which the image display unit is attached;
An arm support section for movably supporting the display arm;
A case in which the arm support is provided inside;
A light emitting unit provided on the display arm and moving together with the display arm;
A portable display device, comprising: one or more light receiving portions provided in the case for detecting light emitted from the light emitting portion. The portable display device according to claim 1,
The display arm is supported by an arm support portion so as to be movable between a payout position drawn from the case and a retracted position accommodated in the case,
The light receiving part is provided in at least two places,
At least one light receiving unit among the light receiving units detects light emitted from the light emitting unit when the display arm is extended to the vicinity of the extended position including the extended position. The portable display device according to claim 2, wherein
A feeding device having a power source for feeding out the display arm from the case;
A portable display device further comprising control means for controlling the feeding device based on a detection result of the light receiving unit. The portable display device according to claim 3, wherein
The control means determines whether to allow the display arm to be extended by the supply device or to allow the display arm to be moved by an external force based on the detection result of the light receiving unit, and controls the supply device. A portable display device characterized by that. The portable display device according to claim 3, wherein
The portable display device, wherein the control means controls the feeding device so as to change a feeding speed of the display arm based on a detection result of the light receiving unit. The portable display device according to claim 1,
The portable display device, wherein the light emitting unit irradiates a light receiving region of the light receiving unit and a region around the light receiving region. The portable display device according to claim 3, wherein
The portable display device according to claim 1, wherein the light emitting unit is provided at two positions with a predetermined distance from the display arm along the feeding direction. In the portable display device according to any one of claims 1 to 7,
A portable display device further comprising a mounting device for mounting on a user's head.

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