JP2011053079A - Led display device serving as infrared sensor lens and method for integrating infrared sensor lens and led lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an infrared proximity sensor avoiding malfunction even if visible light enters a filter (lens) and reaches a detection part, by integrating/sharing an infrared lens and an LED lens. <P>SOLUTION: An infrared proximity sensor 1 includes a resonance point part of the infrared proximity sensor 1; a detection part 1b detecting a peak value of the resonance point part; a resistance part 1d for multiplying the peak value by a constant resistance value; and a filter 8 through which light of any wavelength is attenuated. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to, for example, an infrared sensor lens combined LED display device and a method for integrating an infrared sensor lens and an LED lens.

  Conventionally, filter materials (parafilter (registered trademark), etc.) with wavelength filter characteristics are commonly used for infrared remote control and detection unit lenses that use infrared rays, such as human body detection sensor lenses for toilets. Used for. Infrared sensor lenses and LED lenses are separate and are generally ordered and manufactured separately.

Conventionally, it has been a general view of those skilled in the art that a general LED lens cannot be shared as a lens of an infrared sensor. As one of the causes, there has been known a problem that light close to the sensor window such as a fluorescent lamp or sunlight causes the infrared sensor to malfunction. As a means for solving this problem, technical ideas disclosed in the following three documents have been proposed.

JP 2008-112792 A JP-A-6-251616 JP 57-25738 A

  In the method of removing optical noise by the interference film filter proposed in Patent Document 2 and Patent Document 3, a gap is generated between the semiconductor light receiving device and the interference film filter, and the optical noise from the fluorescent lamp is circulated. There was a case. There is also a problem that the assembly process is complicated. Patent Document 1 is provided as a semiconductor light-receiving element and a semiconductor light-receiving device that can solve these problems and easily remove optical noise. However, in the technical idea disclosed in Patent Document 1, only light of about 910 nm immediately after lighting of the fluorescent lamp and 1013 nm during lighting is blocked. When a light source other than the fluorescent lamp, for example, an LED is a light source, Although the wavelength value changes, it does not change the malfunction of the infrared proximity sensor.

  Further, in any of Patent Documents 1, 2, and 3, the above-mentioned problem cannot be properly solved, so the idea of sharing the infrared proximity sensor and the LED lens in an integrated manner is currently present. There is nothing. As described above, when the infrared proximity sensor and the LED lens are integrated and shared, visible light must pass through the filter (lens). Accordingly, since all of the adjacent light enters from the outside of the filter (lens), there is a problem that the infrared proximity sensor reacts to such proximity light / environment light and causes malfunction.

  In the first place, the mechanism that causes the proximity light / environmental light such as fluorescent light or sunlight to cause the infrared proximity sensor to malfunction is that the wavelength of light emitted from the fluorescent light or sunlight is the wavelength of infrared light (approximately 0.7 μm to 0 μm). .1mm), the detector of the infrared proximity sensor misunderstands that it has received infrared light, converts the light into an electrical signal, and malfunctions occur such as TV / audio etc. is there.

  The present invention is intended to appropriately solve the above-mentioned problems, and its fundamental purpose is an infrared ray that does not cause malfunction even when visible light is incident on a filter (lens) and reaches a detection unit. It is to provide a proximity sensor. Another object of the present invention is to provide an infrared sensor lens combined LED display device that integrates and shares an infrared lens and an LED lens without malfunction and a method for integrating the infrared sensor lens and the LED lens.

  In order to achieve this object, the present invention according to claim 1 is an infrared proximity sensor, comprising: a resonance point portion of the infrared proximity sensor; a detection portion for detecting a peak value of the resonance point portion; and the peak portion. A resistor unit for applying a certain resistance value and a filter (lens) for passing and attenuating all wavelengths of light are provided.

  According to the present invention, as a method for preventing malfunction of an infrared proximity sensor from near light around the sensor window, a peak of a resonance point existing in the sensor is found, and a certain resistance value described later is applied to that point. The unique resonance point to which this sensor responds was found by cut-and-try and succeeded in preventing malfunctions with a probability of almost 100%. As a result, it is possible to use an infrared sensor and an LED on a single substrate and use a common lens.

  The sensitivity of the sensor is best when the electric resistance constant range in the circuit for controlling the infrared proximity sensor is 330Ω to about 3 kΩ, and the sensing distance (distance from the object to the infrared proximity sensor) is about 20 mm to 40 mm.

  Further, the resistance constant range is not limited to 330Ω to about 3 kΩ as long as there is an electric resistance constant range that is outside the above constant range and prevents malfunction of the infrared proximity sensor. That is, when a parapet (registered trademark: manufactured by Kuraray Co., Ltd.) is used for the filter (lens), a constant range of 39 kΩ to about 51 kΩ is preferable.

  Further, according to the above configuration, since the resistance value to be applied is large, the standby current consumption of the infrared proximity sensor can be suppressed to 36 μA or less, and a low load on the battery can be realized.

  Infrared proximity sensors are usually and generally distributed, manufactured, and sold. The infrared rays with a wavelength of approximately 0.7 μm to 0.1 mm are received by the detector and converted into electrical signals to transmit information. To do. Infrared sensors can be divided into two types, thermal type and quantum type, and the present invention is the latter type. In general, the infrared proximity sensor is made of polysilicon, but is not limited thereto.

  For quantum infrared sensors, semiconductor elements such as phototransistors and photodiodes (including PN photodiodes, PIN photodiodes, avalanche photodiodes, and Schottky photodiodes) are compatible with the present invention. The photodiode is mainly made of silicon (Si), but is not limited thereto. In other words, materials other than silicon can be applied to GaAsP, Ge, InGaAs / InP, and the like.

  The LED is a kind of a semiconductor element that emits light when an electric current is applied, which is usually distributed / manufactured / sold, and includes those that emit light from the infrared region to the visible light region and the ultraviolet region.

  An electronic circuit is an electric circuit that connects an electronic element or the like with an electric conductor to create a path for current and to perform a desired operation. The electronic circuit controls an infrared proximity sensor and uses the above method to detect the proximity light around the sensor window. It serves to prevent malfunctions.

  In general, a filter material (such as a parafilter) that transmits infrared light and red light and has wavelength filter characteristics is commonly used for infrared remote controllers and detection lenses that use infrared light. However, in the parafilter, the visibility of blue and green is severe.

  Therefore, the present invention places three colors of RGB-LEDs and an infrared proximity sensor on the same base, and allows the LED and visible light to pass through one window. Filter materials that make this possible are produced and manufactured using colored PET (polyethylene terephthalate) materials, colored acrylic materials, colored polycarbonate materials, etc. that have the characteristic of passing and attenuating all wavelengths of light. Can be used. For example, Parapet (registered trademark: manufactured by Kuraray Co., Ltd.), Iupilon sheet (manufactured by Mitsubishi Engineer Plastics), Sepcal sheet (manufactured by Shin-Etsu Polymer), Suntelfie (manufactured by Sun Delta), Finelite (registered trademark: manufactured by Sumitomo Bakelite), Sunroid (registered trademark) : Manufactured by Sumitomo Bakelite) and Polyca Ace (registered trademark: manufactured by Sumitomo Bakelite), the functions of the present invention can be efficiently exhibited.

  In the case, light is generally irregularly reflected, and the white case is likely to cause irregular reflection of light. Therefore, it is preferable to fix the above-mentioned integrally shared lens more securely, and to fix it with black or near gray gray resin-based double-sided tape to prevent irregular reflection of light around the infrared proximity sensor. It is.

  Further, the double-sided tape may be constituted by adopting a rubber-based tape for countermeasures against static electricity.

  Further, when the casing is made black, a rubber or resin-based double-sided tape of black or a gray color close to black is not particularly required.

  By providing the above configuration, in the infrared proximity sensor, when near-field light or ambient light such as fluorescent light or sunlight enters from the sensor window, the wavelength is attenuated by the filter (lens), and the detection unit of the infrared proximity sensor When activated, the detection unit detects the peak portion of the resonance point portion, and when the resistance portion applies a certain resistance to the peak portion, malfunction of the infrared proximity sensor is prevented.

  Therefore, according to the present invention, the infrared proximity sensor lens and the LED lens are integrated and shared, and visible light enters the filter (lens) and does not cause malfunction even when it reaches the detection unit. A sensor can be realized.

  In the above configuration, the resonance point portion and the peak portion can be found by a cut-and-dry method.

  According to the present invention, an infrared proximity sensor that does not cause malfunction even when a lens of an infrared proximity sensor and an LED lens are integrated and shared, and visible light is incident on a filter (lens) and reaches a detection unit. realizable. That is, an infrared proximity sensor and R (red), G (green), and B (blue) LEDs can be mounted on a single substrate, and the infrared sensor device functions as a display by mounting a plurality of LEDs. Can be realized. Further, there is no need to separately order an infrared proximity sensor lens and an LED lens that have been generated and manufactured separately, which is significant in terms of cost.

It is a schematic diagram which shows the functional structure of the infrared proximity sensor and filter (lens) which concern on one Embodiment of this invention. It is the front view with which the infrared proximity sensor and LED which concern on one Embodiment of this invention were arranged in parallel. It is a figure which shows the transmittance | permeability of the light in the parafilter and parapet which concerns on one Embodiment of this invention. It is a figure showing LED luminous intensity after parapet passing based on one Embodiment of this invention. It is a figure showing LED luminous intensity after para filter PF68 (color number) passage. It is a figure showing a thing with high lens density concerning one embodiment of the present invention. It is a figure showing a thing with low lens density concerning one embodiment of the present invention. It is sectional drawing which shows the structure in the housing | casing shared with the infrared proximity sensor and filter (lens) which concern on one Embodiment of this invention. It is a control circuit diagram concerning one embodiment of the present invention. It is a graph showing the recommended constant of Ohm concerning one embodiment of the present invention. It is a figure which shows the reflection pattern of the ambient light which concerns on one Embodiment of this invention. It is the figure which incorporated the conventional infrared proximity sensor in the automatic door. It is the figure which incorporated the infrared proximity sensor and LED device which concern on one Embodiment of this invention in the automatic door.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following, the range necessary for the description for achieving the object of the present invention is schematically shown, and the range necessary for the description of the relevant part of the present invention will be mainly described. Are according to known techniques.

  FIG. 1 is a schematic diagram showing a functional structure of an infrared proximity sensor and a filter (lens) according to an embodiment of the present invention. The infrared proximity sensor 1 includes a detection unit 1a that receives infrared light and other light, a resonance point unit 1c that exists in the infrared proximity sensor 1, a detection unit 1b that detects a peak value of the resonance point unit 1c, and a peak value. It is composed of a resistance portion 1d that applies a certain resistance value, and a filter (lens) 8 that attenuates all wavelengths of light. In the figure, the dimensional aspect may not reflect the actual situation.

  FIG. 2 is a front view of an aspect in which an infrared proximity sensor and RGB LEDs according to an embodiment of the present invention are arranged in parallel. An RGB-LED is arranged on the right side of the proximity sensor 1. Further, it is a base (not shown in the figure) that supports the infrared proximity sensor 1 and the RGB-LED. In addition, these positional relationships are not particularly limited to this, and do not prevent narrowing or expanding as much as possible. For example, if a plurality of LEDs are used, the infrared proximity sensor and the LED device also function as a full color display.

  FIG. 3 is a diagram showing the light transmittance in the Parafilter (registered trademark) and Parapet (registered trademark) according to an embodiment of the present invention. Parapet (PP) (registered trademark) is indicated by a graph in which the transmittance falls within a range of about 10% to 53%, and Parafilter (PF) (registered trademark) is indicated by a graph in which the transmittance falls within a range of about 0% to about 90%. . Parapet (registered trademark) is a molding material of methacrylic resin that attenuates all wavelengths of light. Parafilter (registered trademark) is a filter grade product of Kuraray Co., Ltd. The transmittance of the parapet wavelength is constant from 10% to 50% at 61 nm to 670 nm, and from 50% to 55% above 670 nm. On the other hand, the transmittance of the wavelength of the parafilter is 10% at 820 nm to 850 nm, and 10% to 80% at 850 nm to 880 nm, and maintains a numerical value of 80% or more from 880 nm. Even with a transmittance of 50%, the infrared proximity sensor 1 reacts sufficiently. The infrared proximity sensor 1 reacts to about 30% as a limit. However, as the transmittance decreases, the distance between the infrared proximity sensor 1 and the object also decreases. In addition, the numerical values in the figure are not limited to this because they change by using a filter material that passes and attenuates all wavelengths of light that are arbitrarily selected.

  In addition to Parapet (registered trademark) filter materials, colored PET (polyethylene terephthalate) materials, colored acrylic materials, colored polycarbonate materials include Iupilon sheet (Mitsubishi Engineered Plastics), Sepcal sheet (Shin-Etsu Polymer), Suntelfee (Sun Delta), Fine Light (Sumitomo Bakelite), Sunroid (Sumitomo Bakelite), Polyca Ace (Sumitomo Bakelite) and the like can be used.

  FIG. 4 is a diagram illustrating LED luminous intensity after passing through a filter according to an embodiment of the present invention. LED intensity after passing through Parapet (registered trademark) is shown. On the other hand, FIG. 4A shows the LED luminous intensity after passing through the parafilter PF68 (color number) (registered trademark). In Parafilter (registered trademark), the wavelength of transmission is adjusted by material distribution, and red having a wavelength close to that of infrared light is visible, but blue is difficult to see. In addition, green is not as blue, but there are visible difficulties. On the other hand, in the parapet, as shown in the figure, it is recognized that all colors of red, green and blue are clearly seen.

  5 and 5A are diagrams showing the difference in the lens density according to the embodiment of the present invention. FIG. 5 shows a high lens density, and FIG. 5A shows a low lens density. The filter material used for the lens is as described above.

  FIG. 6 is a cross-sectional view showing a structure in a shared housing for the infrared sensor 1 and the filter (lens) 8 according to an embodiment of the present invention. Inside this housing are an infrared proximity sensor 1, a sensor window 6 through which light enters and exits, an outer cover 7 that covers the housing, an inner cover 7A, a filter (lens) 8, and a double-sided tape that covers the lens. 9, a main board 10, a spacer 11, a screw 12, an antenna board 13, and a lead frame 14 are combined and shown in the figure. The sensor window 6 has a width of about 8 mm, but is not limited to this. The center of the detection axis and the center of the infrared proximity sensor 1 are about 1.2 mm apart, but the present invention is not limited to this. Also, both the outer cover 7 and the inner cover 7A are white, and the double-sided tape 9 is preferably black or a color close to black in order to prevent light scattering in the housing and to absorb heat. The double-sided tape 9 is made of a rubber-based insulator, but a resin-based one is preferred. If the cover is black or dark gray, the black double-sided tape is not necessary. In addition, the LED display is omitted in FIG. Further, the main board 10 may be omitted for cost reduction.

  Since this figure is only an example of the present invention, the positional relationship, quantity, and type of each component in the housing are not limited to this.

  FIG. 7 is a control circuit diagram according to an embodiment of the present invention. R1 in the circuit diagram 25 is a pull-up resistor 20. The pull-up resistor is a resistor when the circuit is connected to Vdd by inserting a resistor. The output terminal of the infrared proximity sensor 1 is connected to a power supply voltage of about 3.3 volts and a pull-up resistor of 470 kΩ. R2 is an adjustment resistor 20A for the infrared proximity sensor. C12 is a noise absorbing capacitor 21. C13 is also a noise absorbing capacitor 21A, but C12 absorbs the high frequency region and C13 absorbs the low frequency region. A-LED is an anode LED, GND is ground, OUT is an output, prog is a sensor adjustment terminal, Vdd is a power supply voltage, and a number is placed on the side of it is a pin arrangement number.

  FIG. 8 shows the voltage and current parameters at each resistance value of 330Ω to about 3 kΩ. The vertical axis is Idd, that is, the current of the unit μA, and the horizontal axis is Vdd and the voltage. This is a voltage that the infrared proximity sensor 1 can use from 2.4V to 3.6V. 330, 470, and 2k are resistance values, and inf is a limit point. Since the value of the flowing current decreases as the resistance value increases, the power consumption can be suppressed.

  Next, the operation of the present invention configured as described above will be described in detail.

  As shown in FIG. 1, when the proximity light / environment light passes through the filter (lens) 8, the wavelength of the light is attenuated. The detection unit 1a receives the attenuated light, and among them, the resistor unit 1d applies a certain resistance to the peak value of the resonance point unit 1c that causes the infrared proximity sensor 1 to malfunction, thereby preventing malfunction.

  The constant resistance value applied to the resistance portion 1d is as shown in FIG. That is, it is preferable to use it in the recommended constant range of 330Ω to 3 kΩ. However, when Parapet (registered trademark) 4 is adopted as the material of the filter (lens) 8, it is desirable to use it at 39 kΩ to 51 kΩ. Further, since the resistance value is large, the power consumption is also small. Specifically, it decreases to 100 μA to 30 μA. The sensing distance is originally a performance of the infrared proximity sensor 1, but is a distance from the object to the infrared proximity sensor 1. It is 20mm to 40mm. When a cover or lens is attached to this, the sensing distance changes from about 5 mm to 10 mm. N refers to the number of bases here. That is, N = 10 means that the number of the bases is 10, and even if the experiment is performed with that number, the probability is almost 100%. Moreover, normal operation | movement by air temperature-20 degreeC-45 degree | times is recognized.

  FIG. 9 is a diagram conceptually showing the state of infrared reflection according to one embodiment of the present invention. Among those stacked on the substrate 10, the one displayed as “E” is the infrared light emitting block 1 </ b> A. What is displayed as “D” is a block 1B that receives infrared rays. The ambient light is red, orange, or yellow, which is near-infrared light having a wavelength close to that of infrared rays. Under normal circumstances, the light receiving block 1B that has received this light may malfunction, but with the structure of the present invention. That doesn't happen. Crosstalk is a phenomenon in which infrared light incident on the light receiving block 1B propagates through the substrate 10. When the propagated heat reaches the adjacent light receiving block 1B having the opposite polarity, the original light receiving block. It is a phenomenon that works in the direction of canceling the output generated from 1B.

  FIG. 10 is a front view conceptually showing a state in which a conventional infrared proximity sensor according to an embodiment of the present invention is incorporated in an automatic door. FIG. 10A shows an infrared proximity sensor and an LED device (not shown) in an automatic door. It is a front view which shows notably the mode at the time of incorporating in. In FIG. 10, the infrared proximity sensor 1 senses infrared rays emitted from the user, but the display board only displays red. On the other hand, in FIG. 10A, the infrared ray proximity sensor 1 senses infrared rays emitted from the user, and at that time, the message can be expressed more easily by the user by various display methods using RGB-LEDs. .

  As described above, according to the present invention, the lens of the infrared proximity sensor and the lens of the LED are integrated and shared, and even if visible light enters the filter (lens) and reaches the detection unit, malfunction occurs. There can be no infrared proximity sensor.

  Further, according to the present invention, the infrared proximity sensor and the R (red), G (green), and B (blue) LEDs can be mounted on one base, and the infrared sensor device can be mounted by mounting a plurality of LEDs. It can be realized to serve as a display.

  Further, according to the present invention, there is no need to separately order an infrared proximity sensor lens and an LED lens that have been separately produced and manufactured, which is significant in terms of cost.

  The present invention is not limited to the above-described embodiment, and allows various modifications, additions, substitutions, expansions, reductions, etc., to the above-described embodiment within the scope of the same and equivalent technical idea. is there. Further, what has been described above is merely an example of an embodiment for realizing the technical idea of the present application, and the technical idea of the present application can be applied to other embodiments.

  Furthermore, even when the apparatus, method, and system produced using the present invention are mounted on the secondary product and commercialized, the value of the present invention is not reduced at all.

  As described above, according to the present invention, sharing and integration of a lens used for an infrared proximity sensor and a lens used for an LED can be realized. In other words, for example, a television or a personal computer can also be used as a receiver because the liquid crystal screen includes an infrared proximity sensor. Especially for companies pursuing a simple design, whether or not to add a sensor window or lamp display is a matter of life and death, so it can be said that the demand is very high. What has been separated so far, such as a laptop computer or a TV with a recording function, has a social impact. In other words, by combining separate things into one, various possibilities are expanded, and it is highly possible that the present invention will become a standard in the infrared sensor industry and the display industry in the future.

  Therefore, the present application is not limited to the infrared sensor industry, but in any place including a general home where a scene dealing with a display monitor may occur, or in any mechanical equipment including a mobile phone as a portable music player, and even in the television industry. , TV conference opportunities in companies between remote areas from various events at national and local government level, various industries such as toy industry, advertising industry, hotel / tourism industry, shipbuilding industry, automobile industry, or space development projects, etc. It can be used in various industries and opportunities, such as in each project.

DESCRIPTION OF SYMBOLS 1 Infrared proximity sensor 1a Detection part 1b Detection part 1c Resonance point part 1d Resistance part 1A Light emission block 1B Light reception block 2 RGB-LED
3 base 6 sensor window 7 outer cover 7A inner cover 8 filter (lens)
9 Double-sided tape 10 Main board 11 Spacer 12 Screw 13 Antenna board 14 Lead frame 20 Pull-up resistor 20A Adjustment resistor 21 Noise absorbing capacitor 21A Noise absorbing capacitor 25 Circuit diagram

Claims (5)

  In the infrared proximity sensor, a resonance point portion of the infrared proximity sensor, a detection portion that detects a peak value of the resonance point portion, a resistance portion that applies a certain resistance value to the peak portion, and attenuation through all wavelengths of light An infrared proximity sensor, comprising:   An infrared sensor lens combined LED display comprising the infrared proximity sensor according to claim 1 and a plurality or a single LED (light emitting diode).   3. The infrared proximity sensor lens combined LED device according to claim 2, further comprising a semiconductor element including a photodiode, a phototransistor, and the like.   2. The infrared proximity sensor according to claim 1, wherein the filter that attenuates all wavelengths is at least one of a colored PET (polyethylene terephthalate) material, a colored acrylic material, and a colored polycarbonate material.   The infrared sensor lens combined LED according to claim 2, wherein the filter that attenuates all wavelengths is at least one of a colored PET material (polyethylene terephthalate), a colored acrylic material, and a colored polycarbonate material. Display device.