JP2010009887A - Fold-up type lighting fixture - Google Patents

Abstract

In a foldable lighting fixture, the illuminance on a surface to be irradiated is ensured to be substantially constant.
A foldable luminaire includes a light emitting body 2 having a light emitting surface 2a and incorporating an LED panel, a main body 4 having a mounting surface 4a, a triaxial acceleration sensor for detecting an inclination angle of the light emitting surface 2a, and And a control unit for controlling the emission intensity. The control unit controls the light emission intensity of the LED panel so as to decrease as the target angle formed by the mounting surface 4a and the light emitting surface 2a becomes smaller than a right angle. For example, when the light emitting surface 2a and the mounting surface 4a are vertical as shown in FIG. 3 (5), the light emission intensity of the LED panel is maximized, and the target angle is 45 degrees as shown in FIG. 3 (6). Reduce the light emission intensity of the panel to half. With such control, when the front surface of the instrument is substantially the same surface as the surface to be irradiated, the illuminance on the irradiated surface is kept constant regardless of the distance from the light emitting surface to the irradiated surface. can do.
[Selection] Figure 3

Description

  The present invention relates to a folding lighting apparatus capable of controlling the emission intensity.

  In recent years, people who travel or go on business trips may read or work on trains, airplanes, hotels, etc., and in such situations, they may need their own lighting equipment that can be used immediately. is there.

  However, a conventional lighting fixture such as a lighting stand is such that a hollow arm having flexibility is erected on a base portion (pedestal), and a reflecting umbrella, a socket, and a light bulb are mounted on the upper end of this arm. . This type of lighting fixture is designed to be installed and used on a desk or bedside. For this reason, this type of lighting fixture is bulky, and is not suitable for being carried in a pocket or bag of clothes when traveling or traveling on business, and is unusable under the above-described circumstances.

  In addition, even if you carry the lighting equipment on a trip or business trip, install it properly if the installation in the train is unstable or the space on the desk is limited. Since it may not be possible, it is not convenient and lacks practicality.

  On the other hand, by folding, the size of the lighting fixture can be made as compact as a passport or a mobile phone, and when it is used for reading on a desk or working on a personal computer, it can be used as a lighting stand by deploying it. An instrument is known (see, for example, Patent Document 1). This type of foldable luminaire is easy to carry by being folded when carried.

  This type of folding lighting fixture is shown in FIGS. 10 (a) and 10 (b). The folding lighting device 100 includes a light emitter 101 having a planar light emitting surface 101 a, an arm 102, and a main body 103. In the luminaire 100, a main body 103 is rotatably attached to one end of an arm 102, and a light emitter 101 is rotatably attached to the other end of the arm 102. The light emission intensity of the light emitting surface 101a is always constant.

  As shown in FIG. 10A, when illuminating the small-sized document B <b> 1, the luminaire 100 is used in a state where the light emitting surface 101 a has an acute angle with respect to the main body 103. Then, the irradiated surface L1 on the document B1 is irradiated with light. On the other hand, as shown in FIG. 10B, when illuminating the large-sized document B <b> 2, the luminaire 100 is used so that the light emitting surface 101 a stands vertically with respect to the main body 103. As a result, the irradiated surface L2 on the document B2 is irradiated with light.

When comparing the illuminance of the irradiated surface L1 and the illuminance of the irradiated surface L2, the distance from the light emitting surface 101a to the irradiated surface L1 is closer than the distance from the light emitting surface 101a to the irradiated surface L2. The illuminance of the surface L1 is higher than the illuminance of the irradiated surface L2. Thus, since the illuminance on the irradiated surface varies depending on the distance from the light emitting surface 101a to the irradiated surface, the luminaire 100 cannot keep the illuminance on the irradiated surface constant. In addition, since the illuminance on the irradiated surface cannot be kept constant, it is difficult for the user to read the written document and the like, and stress is applied to the user's eyes.
Japanese Utility Model Publication No. 3-127711

  The present invention has been made to solve the above-described problems, and provides a foldable lighting fixture that can ensure a substantially constant illuminance on an irradiated surface when the light emitting surface is expanded and used. The purpose is to do.

  In order to achieve the above object, the invention of claim 1 is a light emitter having a planar light emitting surface, an arm that rotatably supports the light emitter on the distal end side, and a base end side of the arm that rotates. And a main body having a mounting surface on which the light emitter is placed when the arm is tilted, and a folded state in which the light emitter, the mounting surface of the main body, and the arm are arranged close to each other, In the folding lighting device having a deployed state in which the light emitting surface of the light emitter and the mounting surface of the main body are remotely arranged by raising the arm, an angle formed by the mounting surface and the light emitting surface is detected. Angle detection means and light emission control means for controlling the light emission intensity of the light emitter. The light emission control means emits light from the light emitter as the angle detected by the angle detection means becomes smaller than a right angle. Small strength And controls so as to.

  According to the present invention, as the angle between the mounting surface and the light emitting surface becomes smaller than a right angle, the light emission intensity of the light emitter decreases. When the surface to be irradiated is used, the light emission intensity of the light emitting surface decreases as the distance from the light emitting surface to the surface to be irradiated decreases. Therefore, the illuminance on the irradiated surface can be kept substantially constant regardless of the distance from the light emitting surface to the irradiated surface.

  In addition, since the illuminance on the irradiated surface can be kept substantially constant, it is easy for the user to read the written document and the like, and it is difficult for the user's eyes to be stressed. Further, since the light emission intensity can be reduced, the power consumption of the light emitter can be reduced, and the amount of power used can be saved.

  A folding lighting apparatus according to an embodiment of the present invention will be described with reference to FIG. Fig.1 (a)-(d) shows the change aspect from the folding state of the folding-type lighting fixture (henceforth a lighting fixture) 1 to an expansion | deployment state in order. The luminaire 1 includes a planar light-emitting body 2, an arm 3 that supports the light-emitting body 2, a main body 4 that supports the arm 3, and a clip 5 for locking the apparatus to clothes as necessary. And a triaxial acceleration sensor 6 for detecting the inclination angle of the light emitting surface 2a of the light emitter 2.

  The light emitter 2 includes an LED panel 7 which is a planar thin light source. The light emitter 2 is supported so as to be rotatable around a distal end side rotation shaft (hereinafter referred to as a first shaft) 8 of the arm 3. The main body 4 has a mounting surface 4a on which the light emitter 2 is placed when the arm 3 is tilted, and rotatably supports a base end side rotation shaft (hereinafter referred to as a second shaft) 9 of the arm 3. ing. The end 5a of the clip 5 is joined in the vicinity of the second shaft 9. The user can use the lighting apparatus 1 even in a confined place by holding the clip 5 in the pocket of the clothes.

  The triaxial acceleration sensor 6 is disposed inside the light emitter 2 or at an appropriate portion of the light emitter 2. Note that the tilt angle of the light emitting surface 2a may be detected by using a piezoelectric acceleration sensor, a capacitive acceleration sensor, or the like instead of the triaxial acceleration sensor 6. Further, instead of the LED panel 7, an organic EL panel may be used.

  The first shaft 8 and the second shaft 9 have an appropriate braking mechanism built therein, and the lighting apparatus 1 can be rotated at any angle by rotating the light emitting surface 2a and the arm 3 by the user. Thus, the light emitting surface 2a and the arm 3 can be held.

  The luminaire 1 has a folded state and an unfolded state. As shown in FIG. 1A, the light emitter 2, the mounting surface 2 a, and the arm 3 are mounted by placing the light emitter 2 on the mounting surface 4 a of the main body 4. Are in a folded state in which they are arranged close to each other. At this time, the light emitting surface 2a faces upward. In addition, as shown in FIGS. 1B to 1D, the lighting fixture 1 raises the arm 3 to separate the light emitter 2 from the mounting surface 4 a of the main body 4, and thereby the light emitting surface 2 a of the light emitter 2, and The loading surface 4a of the main body 4 is in a deployed state in which it is remotely arranged.

  The state change from the folded state of the luminaire 1 to the unfolded state will be described. From the folded state of the luminaire 1 shown in FIG. 1 (a), the user can change the second state as shown in FIG. 1 (b). The arm 3 is raised about the axis 9 in the direction of the arrow m1. Thereafter, when the light emitter 2 is driven to rotate in the direction of the arrow m2 around the first axis 8, the lighting fixture 1 is in the unfolded state shown in FIG. When the user rotates the light emitter 2 around the first axis 8 in the direction of the arrow m3, the luminaire 1 is in the unfolded state shown in FIG. Thus, the lighting fixture 1 can rotate the light emitting surface 2a and the arm 3 at an arbitrary angle by the user.

  Next, the internal configuration of the lighting fixture 1 will be described with reference to FIG. The luminaire 1 includes a main body 4 in which a storage unit 41 in which various types of information are stored, a processing unit 42 that performs various arithmetic processes, a control unit (light emission control unit) 43 that controls the operation of each unit of the device, and each unit of the device. And a battery (not shown) for supplying power to the battery. A triaxial acceleration sensor 6 and an LED panel 7 are built in the light emitter 2. The processing unit 42 and the control unit 43 may be built in the light emitter 2.

  In the storage unit 41, light emission intensity information 41a indicating the light emission intensity of the LED panel 7 corresponding to an angle formed by the mounting surface 4a and the light emitting surface 2a (hereinafter referred to as a target angle) is stored in advance. The light emission intensity stored in the light emission intensity information 41a is such that the light emission intensity of the LED panel 7 decreases as the target angle becomes smaller than the right angle, and the light emission intensity of the LED panel 7 increases as the target angle approaches the right angle. Is. When the target angle exceeds a right angle, the light emission intensity of the LED panel 7 is zero and the LED panel 7 does not emit light.

  The processing unit 42 calculates the light emission intensity corresponding to the target angle based on the light emission intensity information 41 a stored in the storage unit 41, and transmits a light emission intensity signal including the calculated light emission intensity information to the control unit 43. As for the target angle, for example, when the mounting surface 4a is on a horizontal plane, the inclination angle of the light emitting surface 2a detected by the triaxial acceleration sensor 6 becomes the target angle, so the processing unit 42 emits light corresponding to this inclination angle. A light emission intensity signal including intensity information is transmitted to the control unit 43.

  The control unit 43 receives the light emission intensity signal transmitted from the processing unit 42 and controls the light emission intensity of the LED panel 7 based on the information of the received light emission intensity signal. Therefore, the light emission intensity of the LED panel 7 is controlled so as to decrease as the target angle becomes smaller than the right angle, and is controlled so as to increase as the target angle approaches the right angle.

  Next, the light emission intensity of the LED panel 7 according to the target angle will be described with reference to FIG. Here, it is assumed that the mounting surface 4a is located on a horizontal plane, is substantially on the same plane as the horizontal plane, and the front side of the luminaire 1 is an irradiated surface by the light emitting surface 2a. It is assumed that the inclination angle of the surface 2a is the same as the target angle. Further, the light emission intensity of the LED panel 7 is shown as a percentage, the maximum light emission intensity of the LED panel 7 is shown as “100%”, and the light emission intensity of the LED panel 7 in the unlit state is shown as “0%”.

  When the luminaire 1 changes from the folded state shown in FIG. 3 (1) to the unfolded state shown in FIGS. 3 (2) and 3 (3), the mounting surface 4a and the light emitting surface 2a are parallel in any state, and the target angle Is 180 degrees, the light emission intensity of the LED panel 7 is “0%”. Further, when the lighting fixture 1 is in the unfolded state shown in FIG. 3 (4), the target angle is 135 degrees, and the light emission intensity of the LED panel 7 is “0%”.

  Moreover, when the lighting fixture 1 is in the unfolded state shown in FIG. 3 (5), the mounting surface 4a and the light emitting surface 2a are vertical and the target angle is 90 degrees (right angle). “100%”. Further, when the lighting fixture 1 is in the unfolded state shown in FIG. 3 (6), the target angle is 45 degrees, so the emission intensity of the LED panel 7 is “50%”. When the lighting fixture 1 is in the unfolded state shown in FIG. 3 (7), the mounting surface 4a and the light emitting surface 2a are parallel and the target angle is 0 degrees, so the light emission intensity of the LED panel 7 is “0%”. Become.

  Next, the relationship between the light emission intensity of the LED panel 7 and the illuminance of the irradiated surface will be described with reference to FIGS. 4 (a) and 4 (b) show cases in which the writing fixtures B1 and B2 are irradiated using the luminaire 1, respectively. Here, it is assumed that the document B1 is a document having a smaller size than the document B2. Further, the mounting surface 4a is located on the horizontal plane, is substantially on the same plane as the horizontal plane, and the front of the luminaire 1 is a surface to be irradiated by the light emitting surface 2a.

  As shown to Fig.4 (a), when irradiating light with respect to the document B1, the lighting fixture 1 is used in the state where the light emission surface 2a becomes an acute angle with respect to the mounting surface 4a, Light is irradiated to the irradiated surface L1 on B1. At this time, since the target angle is an acute angle, the light emission intensity of the LED panel 7 is reduced.

  On the other hand, as shown in FIG. 4 (b), when illuminating the document B2, the luminaire 1 is used with the light emitting surface 2a standing in the vertical direction with respect to the mounting surface 4a. Light is irradiated to the irradiated surface L2 on B2. At this time, since the target angle is a right angle, the emission intensity of the LED panel 7 is maximized.

  In the latter state, the distance from the light emitting surface 2a to the document B2 is longer than the distance from the light emitting surface 2a to the document B1 in the former state, but the light emission intensity of the LED panel 7 is high. The surface L1 and the irradiated surface L2 in the latter state have substantially the same illuminance.

  Next, the structure of the triaxial acceleration sensor (hereinafter referred to as sensor) 6 will be described with reference to FIG. The sensor 6 utilizes a piezoresistive effect that a crystal lattice is distorted by applying a mechanical external force to the crystal, and the resistance value changes due to changes in the number of carriers and carrier mobility in the semiconductor. It is. The sensor 6 is an inertial sensor that measures a component obtained by subtracting the gravitational acceleration component from the motion acceleration component with respect to each of the X-axis, Y-axis, and Z-axis directions.

  The sensor 6 includes twelve piezoresistive elements 61 and a sensor structure 62. The sensor structure 62 includes a rectangular frame-shaped support portion 62a formed by dry etching a base material such as silicon, a weight portion 62b disposed inside the rectangular frame-shaped support portion 62a, and a support portion 62a. And a thin beam portion 62c for connecting the weight portion 62b.

  The piezoresistive element 61 is installed on the beam part 62c, and the beam part 62c is deformed by the movement of the weight part 62b according to the acceleration, so that stress is applied to the piezoresistive element 61. Specifically, when a tilting force is applied to the light emitter 2 (see FIG. 1) in which the sensor 6 is built, the weight portion 62b has an X axis, a Y axis, and a Z axis (depending on the tilting direction of the tilting force). Hereinafter, the beam portion 62c is deformed by displacement in the direction of three axes). A force corresponding to the degree of deformation of the beam portion 62c (hereinafter referred to as stress) is applied to the piezoresistive element 61. Since the resistance value of the piezoresistive element 61 is changed by this stress, the sensor 6 can detect the inclination angle of the light emitting surface 2a by detecting these resistance value changes, that is, signals proportional to the acceleration.

  A signal proportional to the acceleration of the piezoresistive element 61 constitutes a Wheatstone bridge circuit using four piezoresistive elements 61 for each of three axes among the twelve piezoresistive elements 61. And it detects by detecting the change of the resistance value of the piezoresistive element 61 to which the stress was given as a change of voltage.

  Next, a specific example of the detection operation of the tilt angle by the sensor 6 will be described with reference to FIGS. 6 shows the operation when the sensor 6 is displaced in the X-axis direction and the Y-axis direction shown in FIG. 5, and FIG. 7 shows the operation when the sensor 6 is displaced in the Z-axis direction shown in FIG. Indicates. A symbol h in FIGS. 6 and 7 indicates a horizontal plane.

  As shown in FIG. 6, when the weight portion 62b is displaced in the X-axis and Y-axis directions, tensile stress acts on the piezoresistive element 61a on the beam portion 62c1, so that the resistance value of the piezoresistive element 61a increases. And since compressive stress acts on the piezoresistive element 61b on the beam portion 62c1, the resistance value of the piezoresistive element 61b decreases. Further, since a tensile stress acts on the piezoresistive element 61c on the beam portion 62c2, the resistance value of the piezoresistive element 61c increases, and a compressive stress acts on the piezoresistive element 61d on the beam portion 62c2. The resistance value of 61d decreases.

  As described above, when the weight portion 62b is displaced in the X-axis and Y-axis directions, the resistance values of the piezoresistive element 61a and the piezoresistive element 61c and the piezoresistive element 61b and the piezoresistive element 61d have opposite changes. Arise.

  Next, as shown in FIG. 7, when the weight portion 62b is displaced in the Z-axis direction, compressive stress acts on the piezoresistive element 61a on the beam portion 62c1, so that the resistance value of the piezoresistive element 61a decreases. Since tensile stress acts on the piezoresistive element 61b on the beam portion 62c1, the resistance value of the piezoresistive element 61b increases. Further, since a tensile stress acts on the piezoresistive element 61c on the beam portion 62c2, the resistance value of the piezoresistive element 61c increases, and a compressive stress acts on the piezoresistive element 61d on the beam portion 62c2. The resistance value of 61d decreases.

  As described above, when the weight portion 62b is displaced in the Z-axis direction, the resistance values of the piezoresistive element 61a and the piezoresistive element 61c and the piezoresistive element 61b and the piezoresistive element 61d undergo opposite changes. Therefore, when the three axes are inclined by an angle θ from the vertical axis, the sensor 6 obtains a component that is cos θ times. Therefore, based on the gravitational acceleration detection values of the three axes, The inclination angle of the light emitting surface 2a (see FIG. 1) can be detected by obtaining the angle inclined from the vertical axis.

  Next, a method of expressing the tilt angle detected by the sensor 6 will be described with reference to FIG. As a method of expressing the tilt angle, it is generally appropriate to express the tilt angle with respect to the vertical axis. For example, consider a case where the Z axis of the sensor 6 before tilting coincides with the vertical axis, and the axes of the sensor 6 after tilting are the Ax axis, the Ay axis, and the Az axis. In this case, as shown in FIG. 8, the inclination angle detected by the sensor 6 is the angle from the X axis “angle θx from the vertical axis Z”, and the angle from the Y axis “angle from the vertical axis Z”. θy ”. However, it is more practical to express as “angle α from the X axis” and “angle β from the Y axis” using the X axis and the Y axis on the horizontal plane. Note that the angle α and the angle β are positive upward from the horizontal plane.

  Therefore, as a method of expressing the tilt angle detected by the sensor 6, it is suitable to use the angle α and the angle β from the horizontal plane for the X axis and the Y axis, and the angle θz from the vertical axis Z for the Z axis. ing. According to such a method of expressing the tilt angle, when the sensor 6 is not tilted, that is, when the Z axis and the vertical axis coincide with each other, each of the angle α, the angle β, and the angle θz is Expressed as zero.

  When the lighting device 1 is used to irradiate the paper surface, the irradiated paper surface is often in a posture substantially parallel to the mounting surface 4 a of the main body 4 of the lighting device 1. Therefore, it is more appropriate to set the X axis and the Y axis serving as the reference lines on a plane parallel to the mounting surface 4a of the luminaire 1 than on the horizontal plane. At this time, the Z-axis of the sensor 6 before tilting coincides with an axis that is perpendicular to the plane parallel to the mounting surface 4a.

  Therefore, as a method of expressing the tilt angle detected by the sensor 6, the angle α and the angle β from the plane parallel to the mounting surface 4a are used for the X-axis and Y-axis directions, and the Z-axis is from the vertical axis Z. It is suitable to use the angle θz. According to such a method of expressing the inclination angle, when the sensor 6 is in a state parallel to the mounting surface 4a, that is, when the Z axis coincides with an axis perpendicular to the surface parallel to the mounting surface 4a, the angle Each of α, angle β, and angle θz is expressed as zero. The angles α and β are positive upward from the mounting surface 4a.

  Next, an example of the posture of the sensor 6 built in the light emitter 2 will be described with reference to FIG. As shown in FIG. 9, the sensor 6 can be built in a posture in which the X axis and the Y axis are on the horizontal plane and the Z axis is coincident with the vertical axis. Therefore, when the mounting surface 4a is positioned on the horizontal plane, the inclination angle of the light emitting surface 2a detected by the sensor 6 becomes the target angle, and the light emission intensity of the LED panel 7 is controlled based on the detected inclination angle.

  As described above, in the lighting fixture 1 according to the present embodiment, the light emission intensity of the LED panel 7 decreases as the target angle becomes smaller than a right angle. When the front side of the instrument 1 is an irradiated surface by the light emitting surface 2a, the light emission intensity of the light emitting surface 2a decreases as the distance from the light emitting surface 2a to the irradiated surface decreases. Accordingly, the illuminance on the irradiated surface can be kept substantially constant regardless of the distance from the light emitting surface 2a to the irradiated surface.

  In addition, since the illuminance on the surface to be irradiated can be kept substantially constant, the user's reading difficulty is reduced and the user's eyes are less likely to be stressed. Moreover, since the light emission intensity of the LED panel 7 can be reduced, the power consumption of the light emitter can be reduced, and the amount of power used can be saved.

  In addition, this invention is not restricted to the structure of the said embodiment, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, the sensor 6 may detect only the tilt angle of the light emitting surface 2a in the X-axis direction, and the control unit may control the light emission intensity of the LED panel 7 according to this angle.

  Further, by providing a contact switch whose area changes in accordance with the rotation angle of the first shaft 8 and the second shaft 9 in the vicinity of the first shaft 8 and the second shaft 9 of the lighting fixture 1. The target angle may be calculated.

  The luminaire 1 further incorporates a triaxial acceleration sensor in the main body 4. The tilt angle of the mounting surface 4 a of the main body 4 and the tilt angle detected by the triaxial acceleration sensor 6 built in the light emitter 2. The target angle may be calculated using

  Further, when the lighting apparatus 1 is used while being attached to the clothes using the clip 5 in a folded state, that is, the Z axis of the sensor 6 coincides with an axis perpendicular to the plane parallel to the mounting surface 4a. In the state, the LED panel 7 may emit light with an arbitrary light emission intensity regardless of the angle of the light emitting surface 2a.

(A)-(d) is a perspective view which shows the change aspect of the folding-type lighting fixture which concerns on one Embodiment of this invention, respectively. The block block diagram of the said lighting fixture. The figure which shows the emitted light intensity of the LED panel according to the object angle of the said lighting fixture in time series. (A) is a perspective view which shows the state which irradiates the small size document by the said lighting fixture. (B) is a perspective view which shows the state which irradiates a large-sized document. (A) is a perspective view of the 3-axis acceleration sensor of the said lighting fixture, (b) is a top view of the same sensor, (c) is the sectional view on the aa line of (b). The sectional side view explaining the displacement operation | movement of the X-axis of the said sensor, and a Y-axis direction. The sectional side view explaining the displacement operation | movement of the Z-axis direction of the said sensor. Explanatory drawing for defining the expression of the inclination angle detected by the said sensor. Explanatory drawing which shows the axial direction of the sensor in the said lighting fixture. The perspective view for demonstrating the irradiation state by light emission of the conventional folding-type lighting fixture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Folding-type lighting fixture 2 Light-emitting body 2a Light emission surface 3 Arm 4 Main body 4a Mounting surface 6 3-axis acceleration sensor (angle detection means)
7 LED panel (light emitter)
43 Control unit (light emission control means)

Claims (1)

A light emitter having a planar light emitting surface;
An arm that rotatably supports the light emitter on the tip side;
A main body having a mounting surface on which the base end side of the arm is rotatably supported and the light emitter is placed when the arm is tilted;
A folded state in which the light emitter, the mounting surface of the main body, and the arm are disposed close to each other; and a deployed state in which the light emitting surface of the light emitter and the mounting surface of the main body are remotely disposed by raising the arm. Foldable lighting fixture having
An angle detecting means for detecting an angle formed by the mounting surface and the light emitting surface;
A light emission control means for controlling the light emission intensity of the light emitter,
The folding light fixture is characterized in that the light emission control means controls to reduce the light emission intensity of the light emitter as the angle detected by the angle detection means becomes smaller than a right angle.

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