JP2012021957A - Property measuring method and property measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently obtain the electric power-entire light property of a light source.SOLUTION: A property measuring apparatus 100 having a first box body 101 with a reflective surface part 113 on which light is regularly reflected, a second box body 102 with an absorbing surface part 123 for absorbing light, and detection means 103 for detecting the reflective light amount which is light amount obtained by the first box body 101 and the direct light amount obtained by the second box body 102 is used to measure a plurality of reflective light amounts by using the first box body 101 to provide the light source 300 with a plurality of different electric powers and to use the second box body to provide the light source 300 with a plurality of different electric powers to measure a plurality of direct light amounts, thereby calculate the electric power-entire light property of the light source 300 based on the plurality of reflective light amounts and the plurality of direct light amounts measured.

Description

  The present invention relates to a characteristic measurement method and characteristic measurement for measuring a power-total light quantity characteristic indicating a relationship between power input to a light source including an LED (Light Emitting Diode) and the like and total light quantity generated from the light source based on the power. Relates to the device.

  Generally, in order to measure the total amount of light from a light source, a light amount measurement system including an integrating sphere is used. The value obtained by the light quantity measuring system provided with this integrating sphere is used as a standard indicating the total light quantity of the light source.

  Here, the integrating sphere is a member in which a diffuse reflection material is applied to the inner wall surface of a housing having a spherical space inside. When a light source is arranged in the inner space of the integrating sphere and this light source is turned on, all the light emitted from the light source is reflected in a diffused state on one of the inner wall surfaces of the integrating sphere. Since the inner space of the integrating sphere is spherical, light reflection occurs repeatedly, and light diffuses at each reflection. Therefore, the amount per unit area of light irradiated on the inner wall surface of the integrating sphere is the same in any part. The light intensity measurement system with an integrating sphere uses the properties of this integrating sphere, and the total light intensity of the light source placed inside the integrating sphere is proportional to the light intensity acquired from a part of the inner wall of the integrating sphere. , A sensor for measuring the amount of light is arranged on a part of the inner wall surface of the integrating sphere, and the value measured by the sensor is used as the total amount of light of the light source. The total light quantity measured by a light quantity measurement system equipped with such an integrating sphere is a relative value that varies depending on the size of the integrating sphere and the type of sensor that measures the quantity of light. The total light quantity of the light source is absolutely evaluated based on the comparison with the standard value.

  In such a light quantity measurement system equipped with an integrating sphere, the light source must be arranged in a pseudo floating state in the space inside the integrating sphere, so that it is difficult to mount the light source. Therefore, it takes a long time to acquire the total amount of light for a large number of light sources.

  Therefore, Patent Document 1 discloses an invention relating to the following light quantity measurement system. That is, the light quantity measurement system includes an integrating hemisphere in which a light diffusing material is applied to a hemispherical inner wall surface, and a flat mirror installed so as to cover the opening of the integrating hemisphere. The light source is disposed at the center of the mirror. According to such a configuration, the integration hemisphere and the virtual image of the integration hemisphere are present by the mirror as if the integration sphere exists, and the light source is fixed in the space inside the integration sphere simply by placing the light source at the center of the mirror. Can be realized. Therefore, it is possible to simplify the work of attaching the light source.

JP 2009-103654 A

  However, when measuring the total amount of light using an integrating sphere or hemisphere, it takes a relatively long time to measure the total amount of light because it uses a part of the light that is uniform in the integrating sphere or integrating hemisphere due to diffuse reflection. I need. Therefore, when measuring the power-total light quantity characteristic indicating the relationship between the input power and the total light quantity of the light source using an integrating sphere, a plurality of total light quantities corresponding to the input power by applying a plurality of different powers to the light source As the light is measured, heat from the light emission accumulates in the light source, and the temperature of the light source rises, making it difficult to accurately measure the total amount of light. Furthermore, when the electric power supplied to the light source is finely changed and the total amount of light is measured each time, an enormous measurement time is required to measure the power-total amount of light characteristic.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a characteristic measuring method and a characteristic measuring apparatus capable of measuring an accurate power-total light quantity characteristic in a short time while suppressing a temperature rise of a light source. And

  In order to achieve the above object, the characteristic measuring method according to the present invention is a characteristic measuring method for measuring the power-total light quantity characteristic, which is the relationship between the power input to the light source and the total light quantity of light emitted from the light source. And a first housing having a first space in which the light source can be arranged, and having a reflection surface portion on the inner surface for regularly reflecting light emitted from the light source arranged in the first space. A first housing having a first opening through which direct light directly reaching from the light source and reflected light reaching after being reflected by the reflecting surface portion pass, and a second space in which the light source can be disposed inward. A second housing having the same shape and the same area as the first opening, and only direct light radiated from the light source arranged in the second space and directly reaching the second opening. A second surface having an absorption surface portion that absorbs light so as to pass through Using a characteristic measuring device comprising: a body; and a detecting means for detecting a reflected light amount that is a light amount of light passing through the first opening and a direct light amount that is a light amount of light passing through the second opening. A first arrangement step of arranging a light source in the first space of one housing to make the measurement possible; and first measuring a first reflected light amount by applying a first power to the light source in the first housing A measuring step; a second measuring step of measuring a second reflected light amount by applying a second power different from the first power to the light source in the first housing; and the second space of the second housing. A second disposing step of disposing the light source in a measurable state, a third measuring step of measuring the first direct light quantity by applying the first power to the light source in the second housing, Apply the second power to the light sources in two housings to measure the second direct light quantity. And a calculation step for calculating the power-total light quantity characteristic of the light source based on the measured first reflected light quantity, second reflected light quantity, first direct light quantity, and second direct light quantity. It is characterized by that.

  According to this, since the reflected light by direct reflection and direct light are directly measured, the amount of light can be measured using strong light, and sufficiently accurate measurement is possible even if measurement is performed in a relatively early time. . Therefore, since the total amount of light can be measured while the temperature of the light source does not rise, errors due to the temperature rise of the light source are possible even when the power is turned on step by step and the total amount of light corresponding to the applied power is measured. An accurate power-total light quantity characteristic can be measured while keeping it as low as possible. Also, the overall measurement time can be shortened, and the power-total light quantity characteristics of many light sources can be measured.

  In the first measurement step and the third measurement step, the time for applying the first power to the light source is 20 msec or less, and in the second measurement step and the fourth measurement step, the second time is applied to the light source. The time for supplying power is preferably 20 msec or less.

  According to the present invention, it is possible to measure the amount of light sufficiently accurately in one measurement step in which the time during which power is applied to the light source, that is, the time during which the light source emits light is 20 msec or less. Accordingly, by suppressing the time for applying power to the light source in one measurement step to 20 msec or less, even if a plurality of measurement steps are executed, all the measurement steps are performed before the temperature of the light source becomes high enough to affect the measurement result. Thus, accurate power-total light quantity characteristics can be acquired.

  In addition, it is preferable that the total time for applying power to the light source in the first housing is 300 msec or less and the total time for supplying power to the light source in the second housing is 300 msec or less.

  According to this, it is possible to suppress heat accumulation at the light source by repeating the measurement step to such an extent that the measurement result is not affected, and it is possible to acquire an accurate power-total light quantity characteristic.

  In order to achieve the above object, a characteristic measuring apparatus according to the present invention is a characteristic measuring apparatus that measures a power-total light quantity characteristic that is a relationship between the power input to a light source and the total light quantity of light emitted from the light source. A first housing having a first space in which the light source can be disposed inward, and a reflection surface portion that regularly reflects light emitted from the light source disposed in the first space on an inner surface A first housing having a first opening through which direct light directly reaching from the light source and reflected light reaching after being reflected by the reflecting surface portion pass, and a second space in which the light source can be disposed inward A second housing having the same shape and the same area as the first opening, and direct light radiated from the light source arranged in the second space and directly reaching the second opening It has an absorption surface part that absorbs light so that only light can pass through Two housings, driving means for applying different power to the light source to cause the light source to emit light, a reflected light amount that is a light amount that passes through the first opening, and a light amount that passes through the second opening Detection means for detecting a certain amount of direct light; first arrangement means for placing the light source in the first space of the first casing to enable measurement; and in the second space of the second casing Second arrangement means for arranging the light source to be in a measurable state, and supplying the first power to the light source in the measurable state in the first housing, and in the measurable state in the first housing A second power different from the first power is applied to the light source, a third power is applied to the light source that is in a measurable state in the second housing, and the light source is in a measurable state in the second housing Control the drive means so that a fourth power different from the third power is input to The first reflected light amount, the second reflected light amount, the first direct light amount, and the second direct light amount measured by the power control unit and the detection unit, and calculating the power-total light amount characteristic of the light source. It is characterized by providing a part.

  According to this, since the reflected light by direct reflection and direct light are directly measured, the amount of light can be measured using strong light, and sufficiently accurate measurement is possible even if measurement is performed in a relatively early time. . Therefore, since the total amount of light can be measured while the temperature of the light source does not rise, errors due to the temperature rise of the light source are possible even when the power is turned on step by step and the total amount of light corresponding to the applied power is measured. An accurate power-total light quantity characteristic can be measured while keeping it as low as possible. Also, the overall measurement time can be shortened, and the power-total light quantity characteristics of many light sources can be measured.

  Note that executing a program for causing a computer to execute each process included in the characteristic measurement method also corresponds to the implementation of the present invention. Of course, implementing the program itself or a recording medium on which the program is recorded also corresponds to the implementation of the present invention.

  According to the present invention, it is possible to accurately measure the power-total light quantity characteristic of the light source while keeping the influence of heat as low as possible.

FIG. 1 is a diagram schematically illustrating a characteristic measuring apparatus. FIG. 2 is a perspective view showing the first housing by cutting away. FIG. 3 is a perspective view showing the second housing by cutting away. FIG. 4 is a block diagram showing a functional configuration of the characteristic measuring apparatus together with a mechanism configuration. FIG. 5 is a diagram schematically showing the characteristic measuring apparatus in order to show the flow of the characteristic measuring method. FIG. 6 is a graph showing the power-total light quantity characteristic measured by the characteristic measurement method.

  Next, the characteristic measuring apparatus 100 according to the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram schematically illustrating a characteristic measuring apparatus.

  As shown in the figure, the characteristic measuring apparatus 100 is an apparatus for measuring a power-total light quantity characteristic that is a relationship between the electric power input to the light source 300 and the total light quantity of light emitted from the light source. The body 101, the second housing 102, the driving means 105, the detection means 103, the conversion means 230, and the processing device 104 (not shown) are provided.

  FIG. 2 is a perspective view showing the first housing by cutting away.

  The first housing 101 is a member that reflects part of light emitted from the light source 300 by regular reflection and guides the light to the first opening 111, and includes a reflective surface portion 113.

  The reflective surface portion 113 is a portion that regularly reflects light emitted from the light source 300 disposed in the first space 110. The reflection surface portion 113 may be provided with a surface (corresponding to the inner surface of the first housing 101) that reflects the light as much as possible without irregular reflection, and may have a so-called mirror surface. In the case of the present embodiment, the reflecting surface portion 113 is a mirror-finished inner surface of the first housing 101 made of metal. Therefore, in FIG. 1 and FIG. 2, the reflection surface portion 113 is described as a separate body, but the reflection surface portion 113 may be integrated with the first housing 101.

  The reflection surface portion 113 has a shape such that the light emitted from the light source 300 reaches the first opening 111 with a single reflection.

  The reflective surface portion 113 is not limited to the truncated cone shape as in the present embodiment, and the reflective surface portion 113 may be a curved surface that curves from the light source 300 toward the first opening 111. As the curved reflecting surface 113, for example, the reflecting surface 113 having a paraboloid on the surface can be listed.

  The first space 110 is a space provided in the first housing 101 and in which the light source 300 is arranged. That is, the first space 110 is a space formed by being surrounded by the reflection surface portion 113 of the first housing 101. In the case of the present embodiment, the first space 110 has a truncated cone shape. That is, the first housing 101 has a cylindrical shape that forms a truncated conical first space 110.

  The first opening 111 is an opening for establishing communication between the first space 110 and another adjacent space. The direct light directly reaching from the light source 300 and the reflected light reaching after being reflected by the reflecting surface portion 113. It is an opening that passes through. In the case of the present embodiment, the bottom surface portion (circular portion having a large area) of the first space 110 having a truncated cone shape corresponds to the first opening 111.

  Here, the total amount of light emitted from the light source 300 disposed in the first space 110 and passing through the first opening 111 may be referred to as reflected light amount. The amount of reflected light is the sum of the amount of direct light that directly reaches the first opening 111 and passes through the first opening 111 and the amount of reflected light that passes through the first opening 111 after being reflected by the reflecting surface portion 113.

  In addition, the first housing 101 is provided with a first insertion hole 112 for placing the light source 300 in the first space 110 on a surface facing the first opening 111.

  In the present embodiment, the first insertion hole 112 is a hole that penetrates the first housing 101 and is connected to the first space 110, and is an upper surface portion (small area) of the frustoconical first space 110. A circular portion) corresponds to the first insertion hole 112.

  FIG. 3 is a perspective view showing the second housing by cutting away.

  The second housing 102 is a member that allows only direct light that is emitted from the light source 300 and directly reaches the second opening 121 to pass therethrough, and includes an absorption surface portion 123.

  The absorption surface portion 123 is a portion that absorbs light emitted from the light source 300 disposed in the second space 120. The absorption surface part 123 should just be provided with the surface (it corresponds to the inner surface of the 2nd housing | casing 102) which absorbs light as much as possible, without reflecting light. In the case of the present embodiment, the absorbing surface portion 123 is formed by applying electroless black plating to the inner surface of the second housing 102 made of metal. Accordingly, in FIG. 1 and FIG. 3, the absorption surface portion 123 is described as a separate body, but the absorption surface portion 123 may be integrated with the second housing 102.

  Here, the electroless black plating is a process for growing a film on the surface of the second housing 102, and is widely used in the field of optical equipment. The film obtained by electroless black plating can absorb not only visible light but also light in the wavelength region of ultraviolet rays and near infrared rays due to its own black color and fine irregularities on the surface.

  It should be noted that the term “absorption” described in the present specification and claims does not mean that incident light such as a black body or a complete cavity is not reflected at all. This means that the reflectance is small.

  The second space 120 is a space provided in the second housing 102 and in which the light source 300 is disposed. That is, the second space 120 is a space formed by being surrounded by the absorption surface portion 123 of the second housing 102. In the case of the present embodiment, the second space 120 has a truncated cone shape having the same shape and the same volume as the first space 110. That is, the second housing 102 has a cylindrical shape that forms the second space 120 having a truncated cone shape.

  The second opening 121 is an opening for establishing communication between the second space 120 and another adjacent space, and has the same shape and the same area as the first opening through which direct light directly reaching from the light source 300 passes. It is. In the case of the present embodiment, the bottom surface portion (circular portion having a large area) of the truncated conical second space 120 corresponds to the second opening 121.

  Here, the total light quantity of the light emitted from the light source 300 arranged in the second space 120 and passing through the second opening 121 may be referred to as a direct light quantity. The direct light amount is only the direct light amount that directly reaches the second opening 121 and passes through the second opening 121, but this is not exact and may include reflected light from the absorption surface portion 123. .

  In the second housing 102, a second insertion hole 122 for placing the light source 300 in the second space 120 is provided on the surface facing the second opening 121.

  In the case of the present embodiment, the second insertion hole 122 is a hole that penetrates the second housing 102 and is connected to the second space 120, and is an upper surface portion (small area) of the second space 120 having a truncated cone shape. A circular portion) corresponds to the second insertion hole 122.

  As shown in FIG. 1, the driving unit 105 is a device that can emit light from the light source 300 by applying different power to the light source 300. In the case of the present embodiment, since the electric power input to the light source 300 is proportional to the current, the driving unit 105 employs a constant current power source. Further, the driving means 105 can output a current having a value determined based on a signal from a power control unit (described later) in a pulse shape. Therefore, in the present embodiment, the power-total light quantity characteristic of the light source 300 is measured as a current-total light quantity characteristic.

  As shown in FIG. 1, the detection means 103 is a device that detects a reflected light amount that is a light amount that passes through the first opening 111 and a direct light amount that is a light amount that passes through the second opening 121.

  In the case of the present embodiment, the detection means 103 includes a detector 114 and an amplifier 115.

  The detector 114 is a sensor that is disposed in the first opening 111 of the first casing 101 and outputs a signal corresponding to the reflected light amount, and is a sensor that is disposed in the second opening 121 and directly outputs a signal corresponding to the light amount. But there is.

  In the case of the present embodiment, the detector 114 includes a photodiode that detects all the amount of light passing through the entire first opening 111. Further, the first opening 111 and the second opening 121 have the same size, and can detect all the light amount of light passing through the entire area of the second opening 121. The detector 114 may be a photodiode array in which a plurality of photodiodes are arranged on the surface, but is preferably a photodiode that seamlessly covers the first opening 111 and the second opening 121.

  The amplifier 115 is a device that amplifies the signal transmitted from the detector 114 to such an extent that the processing device 104 (see FIG. 4) can process it. The amplifier 115 is not an essential component of the present invention.

  In the case of the present embodiment, the amplifier 115 includes an amplifier that amplifies the current signal transmitted from the detector 114 including a photodiode, a converter that converts the current signal into a voltage signal, and a digital analog voltage signal. And an AD conversion unit for converting the signal into the above signal.

  Further, the detection unit 103 includes a light amount suppression filter 131 and a visibility correction filter 132.

  The light quantity suppression filter 131 is a filter that reduces the reflected light quantity and the direct light quantity. The light amount suppression filter 131 is a filter that suppresses the reflected light amount and the direct light amount so as to reach the detector 114 so as to be within the capability range of the detector 114, particularly when the reflected light amount exceeds the detection capability of the detector 114. It is.

  Specifically, the characteristic measurement device 100 is a system that measures the total light amount of the light source 300 that emits visible light, and the light amount suppression filter 131 uniformly suppresses the light amount of light corresponding to a wavelength range of 350 nm to 800 nm. It has a function.

  The visibility correction filter 132 is a filter for adjusting the wavelength distribution of the light emitted from the light source 300 to the specific visibility representing the intensity with which the human eye feels the brightness for each wavelength of light as a numerical value. When the visibility correction filter 132 is used, the total light amount of the light source 300 measured by the characteristic measurement device 100 is strongly correlated with the brightness of the light source 300 felt by humans, and is an effective index (total luminous flux) indicating the capability of the light source 300. It becomes.

  In the present embodiment, the characteristic measuring apparatus 100 includes one detector 114, one amplifier 115, and the like. However, the present invention is not limited to this, and the characteristics of the first casing 101 and the second casing 102 are not limited thereto. Each may include a detector 114 and an amplifier 115. Further, the light amount suppression filter 131 and the visibility correction filter 132 may be appropriately used as necessary. That is, if it is desired to measure the total amount of light from the light source, the visibility correction filter 132 may be omitted, and if it is desired to measure the total luminous flux, the visibility correction filter may be used.

  The conversion unit 230 is disposed at a position corresponding to the first opening 111 and is disposed at a position corresponding to the second opening 121 in a state where the reflected light amount of the light source 300 can be measured, and the direct light amount of the light source 300 is measured. This is a device that can convert the characteristic measuring device to any one of the possible states. In the case of the present embodiment, the conversion unit 230 has a function as a first arrangement unit that arranges the light source 300 in the first space 110 of the first case 101 and makes it possible to measure the amount of reflected light, and the second case. 102 has a function as a second arrangement unit that arranges the light source 300 in the second space 120 so that the amount of light can be directly measured. The apparatus moves the two housings 102 at the same time and switches the positions of the first housing 101 and the second housing 102.

  Further, the conversion unit 230 avoids interference between the detector 114 and the light source 300 and the first casing 101 and the second casing 102 when the first casing 101 and the second casing 102 move. An avoidance mechanism 311 and a detector moving means 231 are provided.

  The avoidance mechanism 311 moves the light source 300 away from the first housing 101 and the second housing 102 when the position of the first housing 101 and the second housing 102 is changed by the conversion means 230, and the conversion operation is performed. When completed, the light source 300 can be brought closer to the first casing 101 and the second casing 102. In the case of this embodiment, the light source 300 is attached to the lifting platform 320, and the avoidance mechanism 311 avoids interference with the first casing 101 and the second casing 102 by lowering the lifting platform 320. The light source 300 is arranged at a measurable position by raising the elevator 320.

  The detector moving means 231 causes the distance between the detector 114 and the first casing 101 or the distance between the detector 114 and the second casing 102 to be relatively close (contact) and to be separated from each other. It is a device that can do.

  In the present embodiment, the conversion unit 230 moves the first housing 101 and the second housing 102, but the present invention is not limited to this embodiment. For example, the detector 114 and the light source 300 may be moved with the first housing 101 and the second housing 102 fixed.

  FIG. 4 is a block diagram showing a functional configuration of the characteristic measuring apparatus together with a mechanism configuration.

  As shown in the figure, the characteristic measuring apparatus 100 includes a processing apparatus 104. The processing device 104 includes a power control unit 141 and a calculation unit 142, and further includes a storage unit 143 and a mechanism control unit 144 as functional units. The characteristic measuring apparatus 100 includes an input device and an output device.

  The processing device 104 is a device that exchanges information with each mechanism unit via an interface, and processes the information based on the respective functions. In general, the processing device 104 is a device such as a computer that includes a central processing unit and a memory and processes information using basic software such as an operating system, and each functional unit is realized by software.

  The power control unit 141 is a processing unit that controls the driving unit 105 to sequentially input a plurality of different powers into the light source 300 for a predetermined time. In the present embodiment, the power control unit 141 controls the driving unit 105 so that a predetermined current flows through the light source 300, and controls the driving unit 105 so that a current flows in a pulsed manner.

  Note that the pulse width, which is the time during which current flows through the light source 300, is not particularly limited, but is preferably 20 msec or less. This is because if the current is passed through the LED that is the light source 300 longer than this, the temperature of the light source 300 rises to a level that cannot be ignored. Further, the lower limit of the pulse width depends on the response performance of the detector 114 and the light source 300 and cannot be generally described, but at present, the pulse width is preferably 100 μsec or more. This is because it is difficult to measure the correct total amount of light when the pulse width is 100 μsec or less. Furthermore, a good range is a range of 1 msec or more and 10 msec or less, and a time selected from the range may be a pulse width. According to this, a stable measurement result can be obtained.

  In addition, the current flowing through the light source 300 does not have to be pulsed, and the current is changed stepwise if the total time for flowing the current in the first casing 101 or the second casing 102 is 300 msec or less. In addition, a current may flow continuously.

  The calculation unit 142 is a processing unit that calculates various information based on a predetermined program and outputs a calculation result. For example, the calculation unit 142 associates the reflected light amount or direct light amount measured by the detection unit 103 with other information and stores it in the storage unit 143, and stores the reflected light amount or direct light amount from the storage unit 143 as necessary. The total light quantity of the light source 300 is calculated by obtaining and substituting it into a predetermined calculation formula.

  Here, the predetermined calculation formula is D = A + (CA) / t. D is the total light quantity. C is the amount of reflected light. A is the direct light quantity. t is a reflectance correction coefficient. The reflectance correction coefficient is a coefficient unique to the characteristic measuring apparatus 100 and is determined using a light source whose total light quantity is known.

  The storage unit 143 is a processing unit that stores the first reflected light amount, the second reflected light amount, the first direct light amount, the second direct light amount, and the like measured by the detection unit 103 together with the first power and the second power.

  The mechanism control unit 144 is a processing unit that controls the conversion unit 230 to cause the light source 300 to perform an operation of switching the first casing 101 and the second casing 102.

  In this embodiment, a computer is employed as the processing device 104, and the processing device 104 performs various controls including control of the mechanism unit. However, the power control unit 141, the calculation unit 142, and the like function individually. It doesn't matter. For example, the calculation unit 142 may be a digital circuit or an analog circuit that satisfies the above equation for calculating the total light amount.

  The input device 210 is a device for inputting information related to the light source 300 that is a measurement target or inputting measurement conditions, and is a man-machine interface such as a keyboard or a mouse.

  The output device 200 is a device that outputs the characteristics of the light source 300 as a numerical value or a graph. For example, the output device 200 is a display device 201 that displays the numerical value or the graph as an image, a printer that prints on a paper medium, or the like.

  Next, a characteristic measuring method using the characteristic measuring apparatus 100 will be described.

  FIG. 5 is a diagram schematically showing the characteristic measuring apparatus in order to show the flow of the characteristic measuring method.

  In the case of the present embodiment, an LED is employed as the light source 300 that is the measurement target of the characteristic measurement apparatus 100. The characteristic measuring apparatus 100 is a system that automatically measures the characteristic of one light source 300. The light source 300 is attached to a lifting platform 320 included in the avoidance mechanism 311 and can be lit with a predetermined current by the driving means 105.

  In advance, the reflectance correction coefficient t of the characteristic measuring apparatus 100 used in the present embodiment is calculated and stored in the storage unit 143 of the processing apparatus 104. The specific method is as follows. The total light quantity of the same type of LED used this time is measured by a light quantity measurement system using an integrating sphere or a light distribution measurement system. This value is set as D. Next, the total amount of light of the LED is measured in the same state as shown in FIG. Next, the light quantity of the LED is measured in the same state as shown in FIG. By substituting D, A, and C obtained as described above into the formula D = A + (C−A) / t, t is calculated. Then, the calculated t is stored in the storage unit 143 of the processing device 104.

  Next, the characteristic of the light source 300 is measured using the characteristic measuring apparatus 100.

  As shown in FIG. 6A, the mechanism control unit 144 controls the avoidance mechanism 311 to raise the lifting platform 320 so that the light source 300 is inserted into the first insertion hole 112 and is ready for measurement. It arrange | positions in the 1st space 110 (1st arrangement | positioning step). Further, the mechanism control unit 144 controls the detector moving means 231 to lower the detector 114 and arrange it at the corresponding position of the first housing 101.

  Note that the bottom of the first housing 101 is in a state where it is pressed against the elevator base 320 or close to the elevator base 320, and stray light outside the first casing 101 is generated inside the first casing 101. To prevent you from getting in.

  Next, the driving means 105 causes the first current I1 (first power) to flow through the light source 300 in the measurable state in the first housing 101 to cause the light source 300 to emit light, and the detector 114 performs the first reflection. The light quantity C1 is measured (first measurement step). In the case of the present embodiment, the first current I1 flows in a pulse manner, and the pulse width is 30 msec. Hereinafter, the current flows in a pulse manner, and the pulse width is unified to 30 msec.

  The measured first reflected light amount C1 is linked to the first current I1 or the like and stored in the storage unit 143.

  Subsequently, the driving unit 105 causes the second current I2 (second power) that is larger than the first current I1 to flow to cause the light source 300 to emit light, and the detector 114 measures the second reflected light amount C2. (Second measurement step).

  The measured second reflected light amount C2 is associated with the second current I2 or the like and stored in the storage unit 143.

  In the present embodiment, the cooling step and the measurement step similar to those described above are further repeated to detect the reflected light amounts C3, C4, and C5 at the current values I3, I4, and I5. Further, these measurement results were stored in the storage unit 143 together with the current value.

  Next, as shown in FIG. 4B, the elevator base 320 is lowered, the detector 114 is raised, the positions of the first casing 101 and the second casing 102 are changed, and the elevator base 320 is raised, The light source 300 is inserted into the second insertion hole 122 and arranged in the second space 120 so as to be in a measurable state (second arrangement step). Further, the detector 114 is lowered and arranged at the corresponding position of the second housing 102.

  Note that the bottom of the second housing 102 is in a state where it is pressed against the elevator base 320 or close to the elevator base 320, and light outside the second casing 102 is reflected inside the second casing 102. To prevent you from getting in.

  Next, the driving means 105 causes the first current I1 to flow to the light source 300 in the measurable state in the second housing 102 to cause the light source 300 to emit light, and the detector 114 measures the first direct light amount A1. (Third measurement step)

  The measured first direct light amount A1 is linked to the first current I1 and the like and stored in the storage unit 143.

  Subsequently, the driving unit 105 causes the second current I2 having a current value larger than the first current I2 to flow to cause the light source 300 to emit light, and the detector 114 measures the second direct light amount A2 (fourth measurement step). ).

  The measured second direct light amount A2 is linked to the second current I2 and the like and stored in the storage unit 143.

  In the present embodiment, the same cooling steps and measurement steps as described above were repeated to detect the direct light amounts A3, A4, A5 at the current values I3, I4, I5. The measurement result is stored in the storage unit 143 together with the current value. It is measured as I3 <I4 <I5.

  Next, the power of the light source 300 based on the measured first reflected light amount C1, second reflected light amount C2, first direct light amount A1, second direct light amount A2, and other C3, C4, C5, A3, A4, A5. -Calculate the total light quantity characteristic (calculation step). The formula used for calculating the power-total light quantity characteristic is Dn = An + (Cn-An) / t (n = 1, 2, 3, 4, 5).

  FIG. 6 is a graph showing the power-total light quantity characteristic measured by the characteristic measurement method.

  As shown in the figure, a graph in which the horizontal axis represents the current value and the vertical axis represents the total light amount, the current value passed through the light source 300 by the driving unit 105 and the total light amount calculated in the above calculation step based on the current value. If the point which shows a relationship is described, the graph which shows an electric power-total light quantity characteristic can be drawn. This graph is output to the output device 200, and the characteristics of the light source 300 are displayed.

  If the characteristic measuring method is implemented using the characteristic measuring apparatus 100 described above, the characteristic of the light source 300 can be accurately measured while suppressing the influence of heat generation. Moreover, since the time for measuring the characteristics is short, the characteristics can be measured for all of the light sources produced in large quantities.

  In addition, this invention is not limited to the said embodiment. Another embodiment realized by arbitrarily combining the components described in this specification may be used as an embodiment of the present invention. In addition, the present invention also includes modifications obtained by making various modifications conceivable by those skilled in the art without departing from the gist of the present invention, that is, the meanings indicated in the claims. included.

  For example, in the present invention, the first housing 101 and the second housing are automatically switched with respect to the light source 300 by the mechanism control unit 144 and the conversion means 230, but these operations are performed manually without using the conversion means 230. It doesn't matter. Further, although the current flowing through the light source 300 is automatically changed by the power control unit 141, this operation may be performed manually.

  In the above embodiment, the power-total light quantity characteristic of the light source 300 is obtained by acquiring the current-total light quantity characteristic. However, the present invention is not limited to this. For example, depending on the type of the light source, it is possible to obtain the power-total light quantity characteristic of the light source by acquiring the voltage-total light quantity characteristic. Further, the current value and the voltage value may be actually measured, and the power-total light quantity characteristic may be acquired based on these values.

  The present invention can measure the characteristics of a light source. In addition, it can be used for inspection of all products in a light source manufacturing factory and evaluation of a light source when the light source is mounted on a substrate.

DESCRIPTION OF SYMBOLS 100 Characteristic measurement apparatus 101 1st housing | casing 102 2nd housing | casing 103 Detection means 104 Processing apparatus 105 Driving means 110 1st space 111 1st opening 112 1st insertion hole 113 Reflecting surface part 114 Detector 115 Amplifier 120 2nd space 121 1st Two openings 122 Second insertion hole 123 Absorption surface portion 131 Light amount suppression filter 132 Visibility correction filter 141 Power control unit 142 Calculation unit 143 Storage unit 144 Mechanism control unit 200 Output device 201 Display device 210 Input device 230 Conversion unit 231 Detector moving unit 300 Light source 311 Avoidance mechanism 320 Lifting platform

Claims (5)

A characteristic measurement method for measuring a power-total light quantity characteristic, which is a relationship between the power input to a light source and the total light quantity of light emitted from the light source,
A first housing having a first space in which the light source can be disposed inward, and having a reflection surface portion on the inner surface for regularly reflecting light emitted from the light source disposed in the first space; A second housing having a first housing having a first opening through which direct light directly reaching from the light source and reflected light reaching after being reflected by the reflecting surface portion passes, and a second space in which the light source can be disposed inward. A casing, which is a second opening having the same shape and the same area as the first opening, and passes only the direct light radiated from the light source arranged in the second space and directly reaching the second opening. A second housing having an absorption surface portion for absorbing light on the inner surface, a reflected light amount that is a light amount of light passing through the first opening, and a direct light amount that is a light amount of light passing through the second opening Using a characteristic measuring device comprising a detecting means for detecting,
A first arrangement step in which a light source is arranged in the first space of the first casing to enable measurement;
A first measurement step of measuring a first reflected light amount by applying a first power to the light source in the first housing;
A second measurement step of measuring a second reflected light amount by applying a second power different from the first power to the light source in the first housing;
A second disposing step of disposing the light source in the second space of the second casing to enable measurement;
A third measurement step of measuring the first direct light quantity by applying the first power to the light source in the second housing;
A fourth measurement step of measuring the second direct light quantity by applying the second power to the light source in the second housing;
And a calculation step of calculating a power-total light quantity characteristic of the light source based on the measured first reflected light quantity, second reflected light quantity, first direct light quantity, and second direct light quantity. In the first measurement step and the third measurement step, the time for applying the first power to the light source is 20 msec or less,
2. The characteristic measurement method according to claim 1, wherein in the second measurement step and the fourth measurement step, a time for applying the second power to the light source is 20 msec or less. The total time for applying power to the light source in the first housing is 300 msec or less,
The characteristic measuring method according to claim 1, wherein a total time for supplying power to the light source in the second casing is 300 msec or less. The calculation step includes:
Calculate the first total light amount corresponding to the first power based on the first reflected light amount and the first direct light amount,
The characteristic measurement method according to claim 1, wherein a second total light amount corresponding to the second power is calculated based on the second reflected light amount and the second direct light amount. A characteristic measuring device for measuring a power-total light quantity characteristic, which is a relationship between electric power input to a light source and total light quantity of light emitted from the light source,
A first housing having a first space in which the light source can be disposed inward, and having a reflection surface portion on the inner surface for regularly reflecting light emitted from the light source disposed in the first space; A first housing having a first opening through which direct light directly reaching from the light source and reflected light reaching after being reflected by the reflecting surface portion pass;
A second housing having a second space in which the light source can be disposed inward, the second opening having the same shape and the same area as the first opening, and radiating from the light source disposed in the second space A second housing having an absorption surface portion for absorbing light so as to allow only direct light that directly reaches the second opening to pass therethrough,
Drive means for causing the light source to emit light by applying different power to the light source;
Detecting means for detecting a reflected light amount that is a light amount passing through the first opening and a direct light amount that is a light amount passing through the second opening;
A first placement means for placing the light source in the first space of the first housing to enable measurement;
A second arrangement means for arranging the light source in the second space of the second casing to be in a measurable state;
A first power and a second power different from the first power are input to the light source in the measurable state in the first housing, and the first power is applied to the light source in the measurable state in the second housing. And a power control unit for controlling the driving means to input the second power,
A characteristic measurement including a first reflected light amount, a second reflected light amount, a first direct light amount, and a second direct light amount measured by the detection means, and a calculation unit that calculates a power-total light amount characteristic of the light source. apparatus.

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