WO2006115100A1 - 電光表示針と導光体 - Google Patents
電光表示針と導光体 Download PDFInfo
- Publication number
- WO2006115100A1 WO2006115100A1 PCT/JP2006/308061 JP2006308061W WO2006115100A1 WO 2006115100 A1 WO2006115100 A1 WO 2006115100A1 JP 2006308061 W JP2006308061 W JP 2006308061W WO 2006115100 A1 WO2006115100 A1 WO 2006115100A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- light guide
- incident
- light emitting
- display needle
- Prior art date
Links
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K37/00—Dashboards
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
- G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/28—Structurally-combined illuminating devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D13/00—Component parts of indicators for measuring arrangements not specially adapted for a specific variable
- G01D13/22—Pointers, e.g. settable pointer
- G01D13/26—Pointers, e.g. settable pointer adapted to perform a further operation, e.g. making electrical contact
- G01D13/265—Pointers which conduct light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D13/00—Component parts of indicators for measuring arrangements not specially adapted for a specific variable
- G01D13/22—Pointers, e.g. settable pointer
- G01D13/28—Pointers, e.g. settable pointer with luminescent markings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0078—Side-by-side arrangements, e.g. for large area displays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
- B60K2360/60—Structural details of dashboards or instruments
- B60K2360/68—Features of instruments
- B60K2360/698—Pointers of combined instruments
- B60K2360/6992—Light conducting pointers
Definitions
- the present invention relates to an electroluminescence display needle used for, for example, a speedometer and a tachometer of an automobile or a motorcycle, and a light guide body thereof.
- an electric light display needle used in a speedometer 700 for an automobile or the like for example, there is an electric light display needle in which light emitting diodes are arranged in a line and the light of the light emitting diode is directly seen (for example, patent Reference 1).
- the electroluminescent display needle 600 disclosed in this Patent Document 1 is provided with light emitting diodes 611a to 611i in a row, and the length of the needle is increased by, for example, lighting them sequentially from the inside. It was possible to give the observer a feeling of change.
- Patent Document 1 Japanese Patent Laid-Open No. 10-332438
- the conventional electroluminescent display needle for directly viewing the light from the light emitting diode has a problem in that uneven brightness occurs, continuity is lost, and an ideal line light source cannot be obtained. Since it is necessary to reduce the space between adjacent light emitting diodes and mount the light emitting diodes with high density, it is difficult to manufacture at low cost, and the wiring and control are complicated! It was.
- the present invention provides an electroluminescent display needle that can be controlled such that the length of the needle is changed, can be manufactured at low cost, and can be manufactured at low cost. Objective.
- the electroluminescent display needle according to the present invention is provided corresponding to each of the plurality of incident surfaces and the respective incident surfaces, and the light incident from each incident surface is transmitted. That A light guide having a plurality of reflection surfaces to be reflected and a plurality of emission surfaces provided corresponding to the respective reflection surfaces and emitting light reflected by the respective reflection surfaces, and the respective incident surfaces And a plurality of light emitting diodes provided to face each other.
- the light guide according to the present invention includes a plurality of incident surfaces
- a plurality of reflecting surfaces provided corresponding to the respective incident surfaces, respectively reflecting the light incident from the respective incident surfaces, and provided corresponding to the respective reflecting surfaces, respectively.
- a plurality of emission areas each emitting light reflected by the surface, and a plurality of the emission areas constitute a needle-like light emitting surface.
- FIG. 1 is a perspective view showing a configuration of an electroluminescent display needle 1 according to a first embodiment of the present invention.
- FIG. 2 is a perspective view showing a configuration of light guide body 10 in the electroluminescent display needle of the first embodiment.
- FIG. 3A is an enlarged side view showing a part of the light guide body 10 of the first embodiment.
- FIG. 3B is a side view showing the configuration of the electroluminescent display needle 1 of the first embodiment.
- FIG. 5 is a circuit diagram showing an example of a circuit configuration for sequentially lighting the light-emitting display hands according to the embodiment of the present invention.
- FIG. 6 is a side view ((a) (b)) and a perspective view ((c)) showing the configuration of the electroluminescent display needle 1 of the third embodiment according to the present invention.
- FIG. 7 is a side view ((a) (b)) and a perspective view ((c)) showing the configuration of the electroluminescent display needle 1 according to the fourth embodiment of the present invention.
- FIG. 8 is a side view showing a configuration of a reflecting surface ((a)) or an incident surface ((b) (c)) in an electroluminescent display needle according to a modification of the present invention.
- FIG. 9 is a plan view of a speedometer in which an electric light indicating hand is used.
- FIG. 10 is a plan view showing a configuration of a conventional direct-view type light-emitting display needle.
- An electroluminescent display needle 1 includes a pointer substrate 3, a plurality of light emitting diodes 2 arranged on the pointer substrate, and a pointer light emitting surface 15 having a sufficiently long length in one direction.
- the pointer light guide 10 is constituted.
- the light-emitting display needle of Embodiment 1 is used, for example, in a speedometer as shown in FIG. 9, and the light-emitting display needle rotates to start from the center of the speedometer to display the speed to the viewer. Show.
- the plurality of unit light guide portions 14 each having the unit emission surface 11, the incident surface 12, and the reflection surface 13 have the same longitudinal direction.
- the indicator light guide body 10 is configured to be arranged in such a manner that the light emitting surface of the light emitting diode 2 is disposed so as to face the incident surface 12 of each unit light guide section 14. It is a feature.
- the electroluminescent display needle 1 of the first embodiment configured as described above has, for example, a control in which the length of the needle changes by causing the light emitting diode 2 to emit light sequentially from the inner side (center of the needle).
- the unit light guides 14 are provided corresponding to the respective light emitting diodes 2. The luminance unevenness that occurs when the light emitting diode is directly visually recognized can be eliminated. Further, in the electroluminescent display needle 1 of the first embodiment, since the light emitted from each light emitting diode 2 is expanded and emitted by the corresponding unit light guide sections 14, the number of light emitting diodes can be reduced. It can be manufactured at low cost.
- the pointer light guide body 10 has an integrally molded body force in which a plurality of unit light guide portions 14 each having a unit emission surface 11, an incident surface 12, and a reflection surface 13 are connected.
- the pointer light-emitting surface 15 is configured such that the exit surfaces of the unit light guides 14 are arranged in series without a break (FIG. 2 (a)).
- the unit light guide 14 constituting the pointer light guide 10 includes an incident surface 12 on which light emitted from the light emitting diode 2 is incident, and light incident through the incident surface 12 as a unit output surface.
- a reflecting surface 13 that reflects in 11 directions and a unit emitting surface 11 that emits light reflected by the reflecting surface 13 are provided.
- the incident surface 12 is formed so as to be substantially orthogonal to the unit exit surface 11.
- the reflection surface 13 that reflects the light incident through the incident surface 12 toward the unit output surface 11 is shaped and positioned so that the light emission luminance of the unit output surface 11 in the unit light guide 14 is uniform. Is set! Speak.
- a light emitting diode used as a light source has a directivity such that the intensity in the vicinity of the optical axis is high and the intensity decreases as the distance from the optical axis increases.
- the directivity of the light emitting diode is used.
- the reflecting surface 13 is an arc surface, and the radius R of the arc, the center C thereof, and the center angle ⁇ (FIG. 3A) are determined by the directivity characteristics of the light emitting diode 2 and the light emitting diode. Is set so that the light emission luminance distribution on the unit exit surface 11 is uniform.
- the light-emitting diodes 2 are respectively provided for the unit light-guiding units 14 configured as described above, and the light-emitting surface of the light-emitting diodes 2 is opposed to the incident surface 12 of the unit light-guiding unit 14 as illustrated in FIG. 3B. Arrange as you do. With such a configuration, the light is emitted from the light emitting diode 2 and the incident surface 12 is A part of the light incident on the unit light guide 14 via the light exit surface 11 is directly emitted from the unit light guide 14, and the rest of the light is reflected by the reflection surface 13 and spreads over the entire light exit surface 11 to be emitted. The intensity distribution of the combined outgoing light is uniform over the entire unit outgoing surface 11.
- the exit surface of the unit light-guiding unit 14 of Embodiment 1 is a rough surface
- FIG. 3B shows a state in which light is diffused and emitted by the rough surface.
- the light emitting diode 2 can be made of a material using various semiconductor materials. Since the space in which the light emitting diode 2 is arranged is limited, the light emitting diode 2 is relatively small. It is preferable to use surface mount type light emitting diodes.
- the electroluminescent display needle 1 of Embodiment 1 configured as described above, the sum of the light directly reaching the emission surface 11 from the light emitting diode 2 and the light reaching the emission surface 11 after being reflected by the reflection surface 13
- the reflecting surface is adjusted so that is uniform over the entire light emitting surface, and uniformity of luminance can be secured over the entire pointer light emitting surface.
- the light-emitting diode may be a curved surface such as a force parabolic column surface, an elliptical column surface, or a parabolic column surface with the reflecting surface 13 as an arc surface.
- An appropriate curved surface can be selected according to the directivity.
- the reflecting surface 13 is a paraboloid
- the light emitting diode 2 is arranged so that the light emitting point is located at the focal point of the paraboloid, all the light reflected by the paraboloid becomes parallel light. . Therefore, if the reflecting surface is uniformly irradiated with light and direct light from the light emitting diode is not emitted from the emitting surface, only the reflected light is emitted uniformly with the emitting surface force. And the occurrence of uneven brightness can be suppressed.
- the reflecting surface is a hyperboloid
- the light emitting diode is disposed at the focal point of the hyperboloid, the light reflected by the reflecting surface proceeds in the direction of dispersion.
- the reflecting surface is an elliptical arc surface
- the reflected light when the light emitting diode is placed at one focus, the reflected light always passes through the other focus. Therefore, it is possible to disperse light evenly on the exit surface by disposing a light diffuser at the focal point where no light emitting diode is disposed.
- the wavelength converting substance can be used efficiently by arranging the wavelength converting substance at the focal point where the light emitting diode is not arranged.
- FIG. 4 (a) is a schematic side view of the electroluminescent display needle 200 according to the second embodiment.
- the light emitting diode 111 and the unit light guide 121 form a unit light emitting part 100 in pairs.
- the unit light emitting portions are arranged in tandem in the X-axis direction to constitute an electroluminescent display needle 1000.
- the electroluminescent display needle 200 includes four unit light emitting portions 100, where 120a indicates an incident surface, 120b indicates a reflective surface, and 120c indicates an output surface.
- Reference numeral 111 denotes a light emitting diode.
- a plurality of unit light guides 121 are arranged in a column to constitute a pointer light guide, and a pointer light emitting surface is constituted by the emission surfaces 120c arranged in a column. Is done.
- FIG. 4 (b) is a schematic side view showing a light emission state of the electroluminescent display needle 200 according to the second embodiment.
- the arrow indicates the optical path from the light emitting diode.
- FIG. 4 (c) is a schematic perspective view of the electroluminescent display needle 200 according to the second embodiment.
- FIG. 4 (d) is a side view of the unit light emitting part 100
- FIG. 4 (e) is a perspective view of the unit light emitting part 100.
- Fig. 4 (a) shows the unit light emitting sites 100 of Fig. 4 (d) arranged in a column.
- the unit light guides 121 of the unit light emitting sites 100 may be physically in contact with each other as shown in FIG.
- the unit light guide is connected with an opaque substance in between, the light emission of one adjacent unit light emitting part 100 can be prevented from being emitted from the emission surface of the other unit light emitting part 100. It is possible to improve the visibility when light is emitted in order.
- by arranging the unit light guides through an opaque substance it becomes possible to prevent light from being propagated to other adjacent unit light emitting parts, and there is a feeling of dynamism when sequentially lighting. Change is possible.
- the reflecting surface 120b is not a circular arc surface as in Embodiment 1, but a flat reflecting surface, the size of the reflecting surface 120b, the angle with respect to the incident surface 120a, and the light emitting diode.
- the position of the reflective surface 120b with respect to the The light emission luminance distribution of the unit exit surface 121 is set so as to be almost uniform in consideration of the position of the light-emitting surface with respect to the incident surface 120a.
- the light emitting diode 111 is arranged for each of the unit light guides 121 configured as described above, and the light emitting surface of the light emitting diode 111 is disposed on the incident surface 111 of the unit light guide 121, the light is emitted from the light emitting diode 111. Then, the light that has entered the unit light guide 121 via the incident surface 120a is reflected by the reflecting surface 13, spreads over the entire emitting surface 11, and is emitted.
- the electroluminescent display needle 200 of the second embodiment configured as described above can make the light emission luminance distribution of the unit emission surface 121 substantially uniform with a relatively simple configuration.
- FIG. 6 is a side view ((a) (b)) and a perspective view ((c)) showing the electroluminescent display needle 300 according to the third embodiment of the present invention.
- This electroluminescent display needle according to the third embodiment is configured in the same manner as in the second embodiment except that the diffuser 315 is disposed immediately above the pointer light guide.
- the same members as those in the second embodiment are denoted by the same reference numerals, and redundant description is omitted.
- the diffuser 315 has a size that covers the pointer light emitting surface of the pointer light guide when viewed from the observation surface direction (y-axis direction). That is, the size in the xz plane direction is preferably equal to or larger than the pointer light emitting surface.
- the thickness of diffuser 315 in the y-axis direction is not particularly limited, and is set to, for example, 10 ⁇ m or more and lmm or less, preferably 50 ⁇ m or more and 700 ⁇ m or less.
- the lower limit of the preferable thickness is set is that the mechanical strength becomes weaker if the lower limit is not reached, and when the pointer light guide body is bonded with a binder, the curl is caused by the stress generated at the interface with the binder. This is because there is a problem that it becomes difficult to handle such as easy to occur. On the contrary, if the thickness of the diffuser exceeds the upper limit value of the preferable thickness, the luminance is lowered.
- FIG. 6 illustrates the positional relationship between the diffuser 315 and the pointer light guide, but the present invention is not limited to this.
- it may be physically and physically arranged to be in contact with each other. It is also possible to bond them together using a binder.
- an air layer with a low refractive index can be interposed, and multiple reflections are made at the interface between the light emitting surface of the needle and the air layer and between the air layer and the diffuser, further reducing brightness unevenness. it can.
- the diffuser is mechanically supported by the light guide and can be handled even if the diffuser becomes thin. It becomes easy.
- the light guide and the diffuser are bonded via a binder or the like, it is possible to enhance the diffusion effect by using a diffuser as a noinder or the like.
- the method of roughing the diffuser is the same as the method of roughing the light guide described above, and etching, blasting, sandpaper, etc. are used.
- the diffuser 315 will be described in more detail below.
- the diffuser 315 includes a light diffusing material in a translucent material. That is, the diffuser 315 is formed by dispersing a light diffusing substance in the translucent substance.
- the same material as the light guide material can be used.
- Acrylic resin, polycarbonate resin, amorphous polyolefin resin, polystyrene resin, norbornene resin, cycloolefin Examples include polymer (COP).
- acrylic resin is highly transparent, yellowing due to light deterioration is unlikely to occur. Therefore, it is preferable for the present invention because the output is less likely to decrease with time.
- Polycarbonate resin is characterized by excellent impact resistance. Therefore, it is preferably used for applications such as the present invention in which mechanical impact is always involved during operation of an automobile or the like.
- Light diffusing materials that have the property of diffusing light are roughly classified into inorganic fillers and organic fillers.
- silica silica, aluminum hydroxide, aluminum oxide, zinc oxide, barium sulfate, magnesium silicate, or a mixture thereof can be used.
- organic filler acrylic resin, acrylonitrile resin, polyurethane, polyvinyl chloride, polystyrene, polyacrylonitrile, polyamide (nylon) and the like can be used.
- the shape of the light diffusing substance is not particularly limited, and examples thereof include a spherical shape, a cubic shape, a needle shape, a rod shape, a spindle shape, a plate shape, a scale shape, and a fiber shape. Spherical beads that excel in sex are preferred.
- the particle size of the light diffusing material is 3 ⁇ m to 25 ⁇ m, preferably 5 ⁇ m to 20 ⁇ m, more preferably 8 111 to 15 111. The smaller the particle size of the light diffusing substance, the higher the light diffusing effect. The larger the particle size, the higher the impact resistance of the diffuser. Therefore, the above range is preferable considering both.
- FIG. 7 illustrates an electric light indicating needle 400 according to the fourth embodiment of the present invention.
- the electroluminescent display needle 400 of the fourth embodiment is the same as that of the embodiment except that a pointer light guide formed by a plurality of unit light guides 121a each having the same function as the unit light guide 121 is used.
- the configuration is the same as in Form 3.
- the entrance surface, the reflection surface, and the exit surface of the unit light guide unit 121a are configured in the same manner as the unit light guide 121. Therefore, the entrance surface, the reflection surface, and the exit surface in FIG. 7 are the same as those in FIG. It is shown with a symbol.
- the diffuser is configured in the same manner as the diffuser 315 of the third embodiment, which is denoted by the reference numeral 415.
- the electroluminescent display needle 400 of the fourth embodiment configured as described above has the same effect as that of the third embodiment, and is easy to handle because the light guide is an integrally molded body. . Furthermore, since it is not necessary to bond the light guides forming the unit light emitting site, the light guide can be made thinner.
- the light emitting diode is, for example, one in which the light emitting element is mounted on a semiconductor / cage or a substrate, and the light emitting element is sealed with grease or the like.
- a semiconductor such as GaAlN, ZnO, ZnS, ZnSe, SiC, GaP, GaAlAs, A1N, InN, AlInGaP, InGaN, GaN, and AlInGaN is formed as a light emitting layer on a substrate. Things are used.
- a light emitting diode having a different light emitting element type and emission color for each unit light emitting site may be used. Also use light emitting diodes containing wavelength converting material. In addition, it is possible to arbitrarily change the emission color for each unit light emitting site by combining the light emitting element and the wavelength converting substance.
- a typical example of the wavelength converting substance is a phosphor.
- This phosphor one that converts light from the light emitting element into a longer wavelength has good luminous efficiency.
- the particle size of the phosphor is preferably 5 ⁇ m to 30 ⁇ m, more preferably the center particle size is in the range of ⁇ 50 ⁇ m.
- the phosphor having such a particle size has a light absorption rate and Conversion efficiency is high and excitation wavelength width is wide. Phosphors smaller than 2 ⁇ form relatively agglomerates and settle quickly in a dense manner in liquid grease, which reduces the light transmittance and converts the light absorption rate. The efficiency is poor and the excitation wavelength is narrow.
- an organic phosphor having a high wavelength conversion efficiency is preferably used when it is used for a portion that is not subject to heat.
- FIGS. 8 (a), (b), (c), and (d) show modified examples of the unit light guide (unit light guide unit) in the first to fourth embodiments.
- the reflecting surface is shown as a plane, but the same applies to the curved surface as shown in the first embodiment.
- a reflection promoting member can be provided so as to cover the side surface of the unit light guide (pointer light guide). In this way, radiation loss from the side surface can be prevented, and the luminance is improved. It becomes possible.
- a white paint for example, barium sulfate
- a white finish for example, white alumite
- a white sheet for example, polypropylene
- metals such as Ag, Al, Ni, Au and Cu, or SiO 2 / ZrO or SiO 2 / TiO, etc.
- a 2 2 2 2 2 metal oxide film is used.
- the film thickness it is preferable to set the film thickness so that it does not transmit light because it does not depend on the wavelength of the light emitting diode force.
- metals high reflectivity !, Ag or high durability, A1 is preferably used
- the reflectance has wavelength dependency. This wavelength dependency is related to the film thickness of the oxide film.
- High refractive index When an oxide film and a low-refractive index oxide film are stacked in pairs, the thickness of each oxide film needs to satisfy the relationship of ⁇ 4 ⁇ , where the light emission wavelength of the light-emitting element is ⁇ .
- ⁇ is a refractive index.
- the reflecting surface is a flat surface or a curved surface
- specular caloring it is preferable to carry out specular caloring in order to improve the reflectance.
- loss due to transmission of light from the reflecting surface can be prevented, and extraction of light from the exit surface can be improved.
- the reflection promoting member is formed on the mirror-finished reflecting surface, it is possible to further improve the extraction of the light having the exit surface force.
- the shape of the incident surfaces 12, 120a may be a flat surface, but more preferably, the incident light is converted into y by prism processing the surface facing the light-emitting diode as shown in Fig. 8 (b). For example, it is possible to increase the luminance of the exit surface closer to the entrance surface. In other words, by prism-casing the light incident part of the incident surfaces 12 and 120a, it is possible to adjust the spread of the light beam after entering the unit light guide (unit light guide part) according to the prism shape. Therefore, it becomes possible to suppress the occurrence of uneven brightness.
- a light emitting diode with a lens as shown in Fig. 8 (c).
- the surface facing the light emitting diode is matched with the lens shape to form a recess.
- exit surface rough total reflection at the exit surface can be suppressed, and the light extraction efficiency can be improved even when the exit surface is strong. It is possible to combine the functions of. As the rough surface force, etching, blast force, sandpaper or the like is used.
- Examples of the light guide material include acrylic resin, polycarbonate resin, amorphous polyolefin resin, polystyrene resin, norbornene resin, cycloolefin polymer (C OP), and the like. It is done.
- acrylic resin has high transparency, so that yellowing due to light deterioration is unlikely to occur. Therefore, it is difficult for the output to decrease with time, so the light guide in the present invention It is suitable as a body material.
- the polycarbonate resin has a characteristic of excellent impact resistance, and as shown in the present invention, an electric light indicating needle used in an environment in which mechanical shock is always applied during operation such as an automobile. Is suitable.
- a configuration in which a wavelength converting substance is contained in the light guide may be employed.
- the wavelength converting substance is disposed in the sealing resin forming the light emitting diode, it is less susceptible to thermal degradation because it is physically separated from the light emitting diode as a heat source. Therefore, not only inorganic phosphors but also organic phosphors with high wavelength conversion efficiency can be used.
- the location of the wavelength converting substance in the light guide may be distributed throughout the light guide, or may be placed only in the portion of the incident surface close to the light emitting diode, or the light exit surface of the light guide. It may be arranged in the vicinity. Due to the difference in the location of the wavelength conversion material, it is possible to make a difference in the light distribution by color harmony between the light from the light emitting diode on the emission surface and the light converted by the wavelength conversion material.
- the surface state can be changed by making different tools for cutting out the exit surface side and the reflection surface side. For example, by cutting out the exit surface side with a coarse saw and cutting the reflective surface side with a fine saw, the exit surface can be obtained in a rough state, and the reflective surface can be in a mirror state.
- the light emitting diodes 211a, 211b, 211c, and 211d are connected in parallel, and the Zener diodes 212b, 212c, and 212d are connected in series with the light emitting diodes 2 l ib, 211c, and 2 l id, respectively. .
- the operating voltage of the Zener diode is increased in the order of 212b, 212c, and 212d.
- the light emitting diode 21 la that is not lighted is turned on first, then the light emitting diode 21 lb, then the light emitting diode 211c, and finally the light emitting diode 21 Id.
- the sequential lighting circuit as described above has a very simple configuration and can be reduced in size, it can be configured on the substrate 3 shown in FIG.
- the present invention can be used for display needles for automobile speedometers and tachometers and various display hands for cockpits.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Transportation (AREA)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Details Of Measuring Devices (AREA)
- Planar Illumination Modules (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Instrument Panels (AREA)
- Led Device Packages (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007514589A JP5616570B2 (ja) | 2005-04-21 | 2006-04-17 | 電光表示針と導光体 |
US11/918,866 US7721672B2 (en) | 2005-04-21 | 2006-04-17 | Electrically illuminating indicator needle and light guiding member |
EP06731990.5A EP1876426B1 (en) | 2005-04-21 | 2006-04-17 | Electric light indication needle and light guide |
KR1020077027111A KR101227609B1 (ko) | 2005-04-21 | 2006-04-17 | 전광표시침과 도광체 |
Applications Claiming Priority (4)
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---|---|---|---|
JP2005123308 | 2005-04-21 | ||
JP2005-123308 | 2005-04-21 | ||
JP2006029957 | 2006-02-07 | ||
JP2006-029957 | 2006-11-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006115100A1 true WO2006115100A1 (ja) | 2006-11-02 |
Family
ID=37214722
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/308061 WO2006115100A1 (ja) | 2005-04-21 | 2006-04-17 | 電光表示針と導光体 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7721672B2 (ja) |
EP (1) | EP1876426B1 (ja) |
JP (1) | JP5616570B2 (ja) |
KR (1) | KR101227609B1 (ja) |
WO (1) | WO2006115100A1 (ja) |
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US9021978B2 (en) * | 2011-10-14 | 2015-05-05 | Denso Corporation | Indicator displaying device |
US9453340B2 (en) | 2009-09-24 | 2016-09-27 | Koninklijke Philips N.V. | Wall or ceiling covering with lighting system layer |
JP2019120804A (ja) * | 2018-01-05 | 2019-07-22 | キヤノン株式会社 | 表示装置および記録装置 |
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FR2901605B1 (fr) * | 2006-05-24 | 2008-08-08 | Sonceboz Sa Suisse | Module indicateur de tableau de bord |
US7963689B2 (en) * | 2007-10-24 | 2011-06-21 | Kun Dian Photoelectric Enterprise Co. | LED-edgelit light guide fixture having LED receiving grooves |
JP5011151B2 (ja) * | 2008-02-12 | 2012-08-29 | 株式会社日立製作所 | 液晶ディスプレイ機器 |
US8616147B2 (en) | 2008-05-16 | 2013-12-31 | Continental Automotive Systems, Inc. | Pointer illumination |
JP5169594B2 (ja) | 2008-08-01 | 2013-03-27 | セイコーエプソン株式会社 | 照明装置、および液晶表示装置 |
US20100231498A1 (en) | 2009-03-13 | 2010-09-16 | Microsoft Corporation | Image display via multiple light guide sections |
KR20110011463A (ko) * | 2009-07-28 | 2011-02-08 | 엘지이노텍 주식회사 | 라이트 유닛 및 이를 구비한 표시장치 |
JP2011249059A (ja) * | 2010-05-25 | 2011-12-08 | Harison Toshiba Lighting Corp | 線状発光装置 |
EP2420883A3 (en) * | 2010-08-17 | 2012-03-07 | LG Innotek Co., Ltd. | Backlight unit and display apparatus having the same |
TWI416049B (zh) * | 2010-09-10 | 2013-11-21 | Young Lighting Technology Corp | 光源裝置及光源裝置的使用方法 |
US9081125B2 (en) | 2011-08-08 | 2015-07-14 | Quarkstar Llc | Illumination devices including multiple light emitting elements |
JP6028616B2 (ja) * | 2013-02-21 | 2016-11-16 | 日亜化学工業株式会社 | 照明装置、及び、液晶表示装置 |
US20150068443A1 (en) * | 2013-09-06 | 2015-03-12 | Kia Motors Corporation | Instrument panel having pointer |
CN110286437A (zh) | 2013-09-17 | 2019-09-27 | 夸克星有限责任公司 | 照明装置 |
US9499097B2 (en) | 2013-12-02 | 2016-11-22 | Continental Automotive Systems, Inc. | Wing pointer illumination |
JP6622965B2 (ja) * | 2015-01-06 | 2019-12-18 | 株式会社小糸製作所 | 車輌用灯具 |
AT517105B1 (de) * | 2015-06-29 | 2016-11-15 | Zkw Group Gmbh | Lichtleiteranordnung zur Erzeugung von zumindest einer Beleuchtungsfunktion und/oder Signalisierungsfunktion eines Kraftfahrzeugscheinwerfers |
AT517414A1 (de) * | 2015-06-29 | 2017-01-15 | Zkw Group Gmbh | Lichtleiteranordnung zur Erzeugung von zumindest einer Beleuchtungsfunktion und/oder Signalisierungsfunktion eines Kraftfahrzeugscheinwerfers |
US10338305B1 (en) * | 2015-11-06 | 2019-07-02 | Eaton Intelligent Power Limited | Luminaire with integrated lightguide |
US20190192879A1 (en) * | 2017-12-22 | 2019-06-27 | Inikoa Medical, Inc. | Disinfecting Methods and Apparatus |
WO2019159828A1 (ja) * | 2018-02-16 | 2019-08-22 | 株式会社小糸製作所 | 自動運転およびバッテリー充電量を表示する車両用灯具システム |
FR3099229B1 (fr) * | 2019-07-23 | 2021-07-30 | Dav | Dispositif de rétroéclairage pour au moins un premier bloc comprenant au moins un premier symbole destiné à être éclairé |
KR20210015342A (ko) * | 2019-08-01 | 2021-02-10 | 엘지이노텍 주식회사 | 조명 장치 |
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Also Published As
Publication number | Publication date |
---|---|
US7721672B2 (en) | 2010-05-25 |
EP1876426A4 (en) | 2009-12-23 |
KR20080005565A (ko) | 2008-01-14 |
JPWO2006115100A1 (ja) | 2008-12-18 |
US20080210154A1 (en) | 2008-09-04 |
EP1876426A1 (en) | 2008-01-09 |
KR101227609B1 (ko) | 2013-01-30 |
JP5616570B2 (ja) | 2014-10-29 |
EP1876426B1 (en) | 2016-06-08 |
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