JP2008047406A - Hanging-type lighting apparatus and lantern - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hanging-type lighting apparatus which can use a projector function while being hung and provide a lantern. <P>SOLUTION: The hanging-type lighting apparatus is provided with an LED light source 33 and a lighting lamp 41, a projector module 14 to project a projected image by using light from the LED light source 33, a lighting part 40 to irradiate out light of the lighting lamp 41 for a lighting purpose, a swinging detecting sensor 38 to detect swinging of the hanging lighting apparatus and a swinging calculating and correcting circuit 21 to compensate blurring of a projected image due to the swinging based on the detected swinging by the swinging detecting device. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hanging illumination device and a lantern having a projector function.

In addition to the function of projecting an image recorded on a recording medium onto a screen, a projector device that can be used as a flashlight is known as a prior art (for example, Patent Document 1).
JP-A-6-59239

  In the conventional projector apparatus as described in Patent Document 1, when it is used in a reduced size, there is a problem that image blur occurs when projected in an unstable state.

(1) The illumination device of the invention of claim 1 is a projection and / or illumination light source, projection means for projecting a projection image using light from the light source, and the light from the light source to the outside for illumination. A radiation means for radiating, a shake detection means for detecting a shake of the projection means, and an image blur compensation means for compensating for a shake of a projected image caused by the shake based on the shake detected by the shake detection means. And
(2) According to a second aspect of the present invention, in the illumination device according to the first aspect, the image blur compensation means includes an image shift means and an image rotation means.
(3) The invention of claim 3 is the illumination device according to claim 2, wherein the image shift means performs image processing on an image shift compensation optical system that moves the position of the projection lens or an image that generates a projection image. It is the image processing means which shifts a projection image by, It is characterized by the above-mentioned.
(4) According to a fourth aspect of the present invention, in the illumination device according to the second aspect, the image rotating means rotates the projection image around its optical axis.
(5) In the illumination device according to claim 4, the image rotation means rotates the projection image by rotating the projection means or by performing image processing on an image for generating a projection image. It is characterized by making it.
(6) The invention of claim 6 is the illuminating device according to any one of claims 1 to 5, wherein the illuminating device has a suspending portion for suspending the illuminating device. It is caused by shaking caused by suspending.
(7) A lantern according to a seventh aspect of the present invention includes the illumination device according to any one of the first to sixth aspects.

  ADVANTAGE OF THE INVENTION According to this invention, the projector which can compensate the blurring of the projection image by the shaking of an illuminating device can be provided.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is an external view of a lantern 1 with a projector according to an embodiment of the present invention. The projector-equipped lantern 1 emits light from the fluorescent tube 11 by a built-in battery. As shown in FIG. 1, the projector-equipped lantern 1 includes a fluorescent tube 11, a squirt 12, and a hanging tool 13 in the same manner as a normal dry battery type lantern. The lantern 1 with a projector can be suspended using the hanging tool 13. Further, since it has a projector function, it includes a projector module 14, a function selector switch 15, a memory card slot 16, a TV channel switch button 17, and an external input terminal 18. Details of the projector module 14 will be described later.

  The function switch 15 is a rotary switch, and switches between the illumination function and the projector function of the projector-equipped lantern 1. The function changeover switch 15 displays a switching position of “OFF”, “LIGHT”, and “PJ”. When the switching position of the function selector switch 15 is set to “OFF”, the function of the projector-equipped lantern 1 is stopped. When the switching position is set to “LIGHT”, the illumination function of the lantern 1 with a projector operates and the projector function stops. When the switching position is set to “PJ”, the illumination function is stopped, or the light quantity of the fluorescent tube 11 is reduced, and the projector function is activated.

  The memory card slot 16 is an insertion slot into which a memory card storing images and videos is inserted. The channel switching button 17 is a button for switching a channel received by the built-in TV tuner. The external input terminal 18 is a terminal for connecting a cable connected to an external device such as a video camera.

  FIG. 2 is a block diagram for explaining the configuration of the projector-equipped lantern 1 of FIG. As shown in FIG. 2, the projector-equipped lantern 1 includes a control circuit 20, a projector module 14, a module driving unit 30, a lighting unit 40, a power supply unit 50, and an input unit 60.

  The control circuit 20 sends a control signal to each part of the projector-equipped lantern 1 by performing a predetermined calculation using a signal input from each part of the projector-equipped lantern 1 based on the control program. Control the lighting function and projector function. The power supplied from the power supply unit 50 is also controlled. The control program is stored in a nonvolatile memory (not shown) in the control circuit 20.

  The control circuit 20 has a shake calculation correction circuit 21. The shake calculation correction circuit 22 corrects left and right blurring of the projected image that occurs when the projector module 14 projects the image by image processing.

  The projector module 14 has a projector function, and includes a projection lens 31, a liquid crystal panel 32, an LED light source 33, a lens driving unit 34, a liquid crystal driving unit 35, and an LED driving unit 36. The LED drive unit 36 supplies current from the battery 51 to the LED light source 33 in accordance with the LED drive signal output from the control circuit 11. The LED light source 33 illuminates the liquid crystal panel 32 with brightness according to the supply current.

  The liquid crystal drive unit 35 generates a liquid crystal element drive signal according to the image data, and drives the liquid crystal panel 32 with the generated drive signal. Specifically, a voltage corresponding to the image signal is applied to the liquid crystal layer for each pixel. In the liquid crystal layer to which a voltage is applied, the arrangement of liquid crystal molecules changes, and the light transmittance of the liquid crystal layer changes. Thus, the liquid crystal panel 32 generates a light image by modulating the light from the LED light source 33 in accordance with the image signal.

  The lens driving unit 34 drives the projection lens 31 to advance and retract in the optical axis direction of the projection lens 31 based on the control signal output from the control circuit 20. Further, the lens driving unit 34 can adjust the focus of the image on the projection surface placed in a predetermined projection distance range by driving the focus lens of the projection lens 31. The projection lens 31 projects the light image emitted from the liquid crystal panel 32 toward a projection surface such as a screen.

  The module driving unit 30 includes a motor 37 and a shake detection sensor 38. The motor 37 rotates the projector module 14 around a rotation axis that is substantially parallel to the optical axis of the projection lens 31. The shake detection sensor 38 includes a gyro, an angular velocity sensor, an acceleration sensor, and the like, detects a shake of the lantern 1 with a projector, and outputs a detection signal to the control circuit 20. That is, when the lantern 1 with a projector is suspended, the swing of the lantern 1 with a projector that swings in parallel with the projection screen is detected. Note that the shake detection sensor 38 can also detect a swing other than the direction parallel to the screen to be projected.

  The illumination unit 40 has an illumination function, and includes an illumination lamp 41 and an illumination lamp drive unit 42. The illumination lamp drive unit 41 supplies the current from the battery 51 to the illumination lamp 41 in accordance with the illumination lamp drive signal output from the control circuit 11. In addition to the fluorescent tube 11, a halogen lamp, a krypton lamp, or the like is used as the illumination lamp 41.

  The power supply unit 50 supplies necessary power to each unit in the projector-equipped lantern 1 and includes a battery 51 and a power supply circuit 52. The power supply circuit 52 converts the voltage supplied from the battery 51 into a predetermined voltage. The battery 51 includes a rechargeable battery, a removable battery pack, a dry battery, or the like.

  The input unit 60 has a function of inputting an external video signal or the like to the projector-equipped lantern 1 and includes a TV tuner 61, a speaker 62, an external input / output terminal 63, a memory card slot 64, and an operation device 66. The TV tuner 61 receives a television broadcast according to a command from the control circuit 20. The speaker 62 outputs audio information received by the TV tuner 61. The external input / output terminal 63 receives data from an external device via a cable (not shown) according to a command from the control circuit 20. The memory card slot 64 reads image data stored in the loaded memory card 65. The read image data is read by the control circuit 20 and stored in a memory (not shown). The operation device 66 includes buttons and switches such as the function selector switch 15 and the TV channel selector button 17. By operating the operation device 66, it is possible to switch functions, and to forward, return, temporarily stop images projected sequentially on the projection surface.

  Next, the structure of the projector module 14 will be described with reference to FIG. FIG. 3 is an enlarged view of the projector module 14. In FIG. 3, a cylindrical member 39 accommodates all the two lenses 31 a and 31 b constituting the LED light source 33, the liquid crystal panel 32, and the projection lens 31. In a state where the projection lens 31 does not shift in the direction perpendicular to the optical axis of the projection lens 31, the optical axis of the projection lens 31 coincides with the illumination optical axis Ax.

  The lens driving unit 34, the liquid crystal driving unit 35, and the LED driving unit 36 that drive the two lenses 31a and 31b forward and backward are not shown. When the projector module 14 is rotated, for example, the liquid crystal panel 32 rotates about the illumination optical axis Ax by the LED light source 33. Thus, since the liquid crystal panel 32 and the projection lens 31 are rotated by the rotation of the projector module 14, the projection image can be rotated around the optical axis. The relative positional relationship among the projection lens 31, the liquid crystal panel 32, and the LED light source 33 is kept constant even when the projector module 14 is rotated.

  Next, details of the shake correction process performed by the shake calculation correction circuit 22 described above will be described. As shown in FIG. 4, when the projection image 71 is projected onto the projection surface 72 in a state where the lantern 1 with a projector is suspended, the lantern 1 with a projector is shaken. For this reason, as shown in FIG. 5, the projected image 71 sways in the direction of the arrow 73.

  At this time, the shake detection sensor 38 detects the inclination θ of the lantern 1 with a projector, the movement distance in the horizontal direction (X direction), and the movement distance in the vertical direction (Y direction), and outputs a detection signal to the control circuit 20. To do. The control circuit 20 stores in advance a table showing the relationship between the movement distances of the lantern 1 with a projector in the X direction and the Y direction and the shift amount of the projection image for eliminating the blur of the projection image. The shake calculation correction circuit 22 refers to the table and calculates the shift amount of the projected image. Then, the image processing for shifting the projected image is performed in the direction opposite to the direction in which the lantern 1 with a projector is shaken, and the image is output to the projector module 14. In the projector module 14, an optical image obtained by shifting the projection image is generated on the liquid crystal panel 32 and is projected from the projection lens 31.

  As shown in FIG. 5, the projection image 71 is not only moved in the X direction and the Y direction, but also tilted, and thus a process for further rotating the projection image 71 is required. The rotation processing of the projected image will be described with reference to FIG. The control circuit 20 drives the motor 37 based on the inclination θ of the lantern 1 with a projector detected by the shake detection sensor 38 and rotates the projector module 14 by a predetermined angle so that the projected image is projected as an erect image. The erect image is obtained by rotating the projection image around the opening center O (more precisely, a rotation axis substantially parallel to the optical axis of the projection lens 31).

  When the lantern 1 with a project is suspended and used as shown in FIG. 4 by the shake correction process and the rotation process described above, the projected image 71 is projected on the projection plane 72 without being shaken even if the lantern 1 with a project is shaken. Will come to be.

According to the embodiment described above, the following operational effects can be obtained.
(1) Even when the projector-equipped lantern 1 is suspended, it is possible to reliably correct the blur of the projected image due to the shaking. As a result, it is not necessary to provide a shake prevention mechanism.

(2) Since the rotation component of the shake is corrected by the rotation of the projector module 14 and the blur in the X direction and the Y direction is eliminated by image processing, a mechanical mechanism for eliminating the blur of the projected image is provided in the projector module 14. The projector module 14 can be reduced in size.

(3) Since the tilt of the projected image due to the tilt of the lantern 1 with a projector can be corrected, the projector function of the lantern 1 with a projector can be used even when the projector is suspended.

(4) The projection image can be projected as an erect image by rotating the projector module 14. Since a rotation process by image processing is not performed, a clear projection image can be projected.

The embodiment described above can be modified as follows.
(1) If it is an illuminating device, it will not be limited to a lantern. For example, the present invention can also be applied to a portable hanging illumination device other than a lantern, such as a flashlight or a disaster light.

(2) The projected image may be rotated by image processing without rotating the projector module 14. That is, in the above-described embodiment, the posture of the projector-equipped lantern 1 is detected by the shake detection sensor 38, and the projector module 14 is rotated by the motor 37 based on the detection result. Instead, the projection image may be rotated by image processing that rotates the projection image formed on the liquid crystal panel 32 based on the detection result of the shake detection sensor 38. Since a mechanism for rotating the projector module 14 is not required, the projector module 14 can be reduced in size.

(3) In the above description, image processing for shifting the projection image on the liquid crystal panel 32 is performed in order to suppress the fluctuation of the projection image on the projection plane caused by the shaking of the lantern 1 with a project. Instead, the relative positional relationship between the liquid crystal panel 32 and the projection lens 31 may be mechanically moved in a plane perpendicular to the optical axis of the projection lens 31 so as to eliminate the shaking. Further, a configuration may be adopted in which the fluctuation of the projected image is corrected by performing optical correction using a variable apex angle prism. Since it is not performed by image processing, a clear projection image can be projected.

(4) A light source for projection and a light source for illumination may be shared. For example, the LED light source 33 may be emitted outside for illumination. In this case, it is preferable to provide light guiding means for radiating the light from the LED light source 33 to the outside. By doing so, the projector-equipped lantern 1 can be reduced in size.

(5) As shown in FIG. 6, a leg 19 that can be expanded and contracted may be provided on the lantern 1 with a projector so that a projected image can be projected horizontally. Applicable when installed on an inclined outdoor surface.

(6) A camera may be provided in the lantern 1 with a projector, and the image processing may be performed so as to detect the shake of the projection image by photographing the projection image projected on the projection surface and to cancel the shake of the projection image.

  The above description is merely an example, and the present invention is not limited to the above embodiment.

1 is an external view of a lantern with a projector according to an embodiment of the present invention. It is a block diagram for demonstrating the structure of the lantern with a projector by one embodiment of this invention. It is a figure for demonstrating the structure of the projector module by one embodiment of this invention. It is a figure for demonstrating the lantern with a projector by one embodiment of this invention used hanging. It is a figure for demonstrating the blurring of a projection image when hanging and using the lantern with a projector. It is an external view of the lantern with a projector by other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lantern with a projector 14 Projector module 15 Function changeover switch 20 Control circuit 21 Shake calculation correction circuit 31 Projection lens 32 Liquid crystal panel 33 LED light source 37 Motor 38 Shake detection sensor

Claims (7)

A light source for projection and / or illumination;
Projection means for projecting a projected image using light from the light source;
Radiation means for radiating the light of the light source to the outside for illumination;
Shaking detection means for detecting shaking of the projection means;
An illumination device, comprising: an image blur compensation unit that compensates for a blur of the projected image caused by a shake based on a shake detected by the shake detection unit. The lighting device according to claim 1.
The image blur compensation unit includes an image shift unit and an image rotation unit. The lighting device according to claim 2,
The image shift means is an image shift compensation optical system that moves the position of the projection lens, or an image processing means that shifts the projection image by image processing the image that generates the projection image. apparatus. The lighting device according to claim 2,
The illuminating device characterized in that the image rotating means rotates the projection image around its optical axis. The lighting device according to claim 4.
The illumination device characterized in that the image rotation means rotates the projection image by rotating the projection means or by performing image processing on an image for generating the projection image. In the illuminating device of any one of Claims 1 thru | or 5,
A hanging part for hanging the lighting device;
The blur of the projected image is caused by shaking due to the suspension of the illumination device by the suspension unit.   The lantern provided with the illuminating device of any one of Claims 1 thru | or 6.

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