JP2011075332A - Light-measuring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-measuring apparatus capable of easily setting the ranges of a plurality of optical sensors, according to the predicted amount of variations, or the like, in the intensity of light to be measured. <P>SOLUTION: The light-measuring apparatus 100 includes: the plurality of optical sensors S<SB>1</SB>-S<SB>n</SB>; an A/D converter 2 for converting analog signals inputted from the plurality of optical sensors into digital signals; and a display 5 for displaying information on the characteristics of light to be measured determined, on the basis of the digital signals. The light-measuring apparatus is constituted to have: a range changeover means 12 for independently changing over each range of the plurality of optical sensors; a level determination means 13 for determining a current level of input from each of the plurality of optical sensors to each current range of the plurality of optical sensors; and a display information generating means 14 for inputting signals to a display for displaying a level list, indicating discriminating information capable of discriminating each of the plurality of optical sensors and information on each current level of the plurality of optical sensors by relating each other. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention generally measures light characteristics such as chromaticity, illuminance, color rendering, wavelength, and power of light sources such as fluorescent lamps, light bulbs, LED lighting, LED elements, LDs, and LCDs (liquid crystal displays). In particular, the optical measuring device is characterized by a function relating to setting of the range of each optical sensor in the optical measuring device that measures the characteristics of light using a plurality of optical sensors.

  2. Description of the Related Art Conventionally, there is an optical measuring instrument that has a plurality of optical sensors, and each optical sensor is configured to detect light in different wavelength bands (Patent Document 1).

FIG. 7 shows a schematic configuration of an example of a conventional optical measuring device. Light meter 200 shown in the figure, has a plurality of photoelectric conversion elements E ₁ to E _n being a plurality of photodiodes. The light incident portion of the photoelectric conversion elements E ₁ to E _n, optical filter spectral transmission characteristics is limited (bandpass filter) F ₁ to F _n are provided as spectroscopic means. Detection circuit C ₁ -C _n each photoelectric conversion element E ₁ to E _n in correspondence with each photoelectric conversion element E ₁ to E _n detects a signal output by receiving is provided. Detection circuit C ₁ -C _n is the photoelectric conversion element E ₁ to E _n provided for each current - is the voltage conversion amplifier (IV conversion amplifier). As described above, the optical filters F _{1 to} F _n having different characteristics, the photoelectric conversion elements E _{1 to} E _n, and the detection circuits C _{1 to} C _n are combined to form a plurality of optical sensors S ₁ to S ₁ having different spectral sensitivity characteristics. S _n is configured.

When measuring light to be measured in the optical measurement device 200, current generated by photoelectric conversion by the photoelectric conversion elements E ₁ to E _n which receives the measured light, the detection circuit (current detection circuit) C ₁ ~ Converted to voltage at C _n .

In general, the detection circuit C ₁ -C _n, the resistance value and capacitance value of the feedback system (for integrating circuit) switched by gain control switches G ₁ ~G _n, the gain of photoelectric conversion elements E ₁ to E _n of the signal Used as a range amplifier to switch. The gain of the range amplifier generally changes by 10 times.

Signals from the optical sensors S _{1 to} S _n are input to the A / D converter 202, A / D converted by the A / D converter 202, and taken into the CPU 201 that is an arithmetic control unit.

In CPU 201, the spectral sensitivity characteristic of the optical sensor S ₁ to S _n (which is measured in advance and stored), the intensity of the signal from the optical sensor S ₁ to S _n, based on the chromaticity of the light to be measured The characteristics of the light to be measured such as the light intensity and the light intensity are calculated and the result is displayed on the display 203.

By switching the range of the optical sensor S ₁ to S _n to be able to enter an appropriate level of the signal relative to the full scale of the A / D converter 202 inputs the high measurement data of the S / N ratio in the CPU201 More accurate measurement results can be obtained. Range setting of the optical sensor S ₁ to S _n can be automatic or fixed to be able to select.

In the optical measuring device 200 as described above, since the detection circuit C ₁ -C _n to each of the plurality of light sensors S ₁ to S _n are provided, S / N ratio can be a good measure. That is, in general, linear sensors and CCDs used in polychromators, etc., output signals with a single readout circuit because all photodiodes output a signal as described above. 200 has a wide dynamic range and a good S / N ratio.

FIG. 8 shows an example of a measurement time screen D ₂ that displays the measurement result of the optical measuring device 200. In the illustrated example, the measurement result I ₁ of the luminous flux and chromaticity of the light to be measured is displayed. Further, the setting of the optical sensor S ₁ to S _n ranges Displays whether the selected I ₂ to or fixed to automatic. Further, when the set range is fixed, when one of the optical sensors S ₁ to S _n are measured over range, and displays an I ₃ that is over range.

The number of the optical sensors S ₁ to S _n of the optical measuring instrument 200 as described above, for example 10, 20, many to as 30, when over range even one of them, measured values incorrectly Become.

In general range settings are automatic, is set to be the optimum range to each photosensor S ₁ to S _n. If the signal within the input range of the optical measuring instrument 200, if the setting of the range of the optical sensor S ₁ to S _n in automatic, does not be over range for any of the optical sensors S ₁ to S _n.

However, for example, when the light to be measured is pulsed light, it is necessary to measure with a fixed range. That is, for example, when measuring on a production line, more specifically, for example, when selecting a product of a light source to be measured (for example, LED) or measuring variation in emission color, the optical measuring device 200 is used. Input light to be measured is often pulsed light. In this case, when the setting of the range to automatic, the limitations on the circuit configuration of the optical measuring instrument 200, the blinking of the measured light input to the optical measuring instrument 200 to switch the optical sensor S ₁ to S _n ranges in time Therefore, it becomes difficult to measure in the optimum range. Therefore, in such a case, measurement is generally performed with a fixed range.

When measuring in this way to secure the range, for example, a measurement target light source in advance a measured light reference (typical) is DC lit, the range of the optical sensor S ₁ to S _n of the optical measuring instruments 200 Set automatically and fix each range at the optimized range. Then, while fixing the range of the optical sensor S ₁ to S _n, become procedure to measure light of the measurement target light source.

JP 2002-013981 A

As described above, for example, when measuring the like manufacturing line can be fixed by setting the range of the optical sensor S ₁ to S _n in advance.

  However, for example, when light that exceeds the range can be input with respect to the range optimized by the measurement target light source that is the reference of the light to be measured in advance as described above due to variations in the intensity of the measurement target light source, etc. There is.

In such a case, in consideration of the variation in the intensity of the pre-measurement target light source, so as not to range over, it is desirable to set the range of the optical sensor S ₁ to S _n.

However, conventionally, for each of the plurality of optical sensors S ₁ to S _n, to set the individual range of the detection circuit C ₁ -C _n is a very troublesome work.

  Accordingly, an object of the present invention is to easily change the range of each optical sensor in an optical measuring instrument that measures the characteristics of light using a plurality of optical sensors in accordance with an expected fluctuation amount of the intensity of light to be measured. It is to provide an optical measuring device that can be set.

  The above object is achieved by the optical measuring device according to the present invention. In summary, the present invention is a photoelectric conversion element and a detection circuit that detects a signal received and output by the photoelectric conversion element, and switches the gain of the signal of the photoelectric conversion element to change the signal of the photoelectric conversion element. A plurality of optical sensors each provided with a detection circuit capable of selectively switching a plurality of ranges to be measured; an A / D converter that converts analog signals input from the plurality of optical sensors into digital signals; A display that displays information relating to the characteristics of the light to be measured obtained based on the digital signal; in the optical measuring instrument, range switching means for independently switching each range of the plurality of photosensors; Level determination means for determining a current level of an input from each of the plurality of photosensors with respect to a current range of each of the plurality of photosensors; Display information for inputting to the display a signal for displaying a level list in which identification information capable of identifying each of the optical sensors and information on the current level for each of the plurality of optical sensors are associated with each other. And an optical measuring device.

  According to an embodiment of the present invention, the level determination means may determine whether the current level for each of the plurality of photosensors exceeds (i) a predetermined first level, (ii) the first The display information generating means determines whether or not it falls below a predetermined second level that is smaller than one level, or (iii) falls below or exceeds the first level. Is determined by the level determining means (i) to exceed the first level, (ii) to be determined to be below the second level, or (iii) to be below the second level Or the information of at least one item in the level list related to the photosensors determined to exceed the first level is displayed in a display mode different from the information related to the photosensors other than those determined as described above. Inputting the order of signals to the display.

  According to another embodiment of the present invention, there is provided a fluctuation range input means for inputting information relating to the fluctuation range of the intensity of the light to be measured to the level determination means, wherein the level determination means has the intensity of the light to be measured as the above Whether or not the level of the input from each of the plurality of photosensors may fluctuate from the current level when it fluctuates by a fluctuation range, and (ii) exceeds a predetermined third level; ) Whether it may fall below a predetermined fourth level that is less than the third level, or (iii) whether it may fall below the fourth level or exceed the third level The display information generating means determines that the level determining means determines that (i) the third level may be exceeded, or (ii) that the display information generating means may fall below the fourth level. Or (iii) the fourth Information on at least one item in the list of levels related to the photosensors determined to be below the level or above the third level is information about the photosensors other than those determined so Signals for display in different display modes are input to the display.

  According to another embodiment of the present invention, the range of the plurality of photosensors is switched to the range-of-change input unit that inputs information relating to the range of variation in the intensity of the light to be measured to the level determination unit, and the range switching unit. Range reset signal generation means for inputting a signal for resetting, and the level determination means is configured to detect from each of the plurality of optical sensors when the intensity of the light to be measured fluctuates within the fluctuation range. Whether the input level of the input fluctuates from the current level and exceeds (i) a predetermined third level; (ii) a predetermined fourth level smaller than the third level; It is determined whether or not (iii) it is less than the fourth level or exceeds the third level, and the range reset signal generating means determines the level determination By means ( ) It is determined that it may exceed the third level, (ii) it is determined that it may be below the fourth level, or (iii) it is below the fourth level or A signal for switching the range of the photosensor determined to sometimes exceed a third level and resetting the range to a range not so determined by the level determination unit is provided as the range switching unit. To enter.

  According to the present invention, the range of each optical sensor in an optical measuring instrument that measures the characteristics of light using a plurality of optical sensors is easily set according to the predicted amount of variation in the intensity of the light to be measured. It becomes possible.

It is a block diagram which shows schematic structure of one Example of the optical measuring device which concerns on this invention. It is a schematic diagram which shows an example of a range setting screen. It is a schematic diagram which shows the other example of a range setting screen. It is a schematic diagram which shows the other example of a range setting screen. It is a block diagram which shows schematic structure of the other Example of the optical measuring device which concerns on this invention. It is a schematic diagram which shows the other example of a range setting screen. It is a block diagram for demonstrating the conventional optical measuring device. It is a schematic diagram which shows an example of the screen at the time of a measurement.

  Hereinafter, the optical measuring device according to the present invention will be described in more detail with reference to the drawings.

Example 1
FIG. 1 shows a schematic configuration of an embodiment of an optical measuring device according to the present invention. In this embodiment, the optical measuring device 100 can measure light characteristics such as chromaticity, illuminance, color rendering, wavelength, and power of a light source such as an LED using a plurality of optical sensors. It is.

Light meter 100 includes a plurality of photoelectric conversion elements E ₁ to E _n being a plurality of photodiodes. The light incident portion of the photoelectric conversion elements E ₁ to E _n, optical filter spectral transmission characteristics is limited (bandpass filter) F ₁ to F _n are provided as spectroscopic means. Corresponding to each photoelectric conversion element E ₁ to E _n, the detection circuit C ₁ -C _n are provided each photoelectric conversion element E ₁ to E _n detects a signal output by receiving. Detection circuit C ₁ -C _n is the photoelectric conversion element E ₁ to E _n provided for each current - is the voltage conversion amplifier (IV conversion amplifier). Combined different characteristics optical filter F ₁ of to F _n and the photoelectric conversion elements E ₁ to E _n a detection circuit C ₁ -C _n is, the spectral sensitivity characteristics differ plurality of light sensors S ₁ to S _n is configured Has been.

Detection circuit C ₁ -C _n is it possible to switch the plurality of ranges by switching the gain of photoelectric conversion elements E ₁ to E _n of the signal measuring the signal of the photoelectric conversion elements E ₁ to E _n selectively ing. In this embodiment, the detection circuits E ₁ to E _n switches the feedback resistor by gain control switches G ₁ ~G _n, is configured as a range amplifier for switching the gain of the photoelectric conversion elements E ₁ to E _n. In this embodiment, the gain of each range amplifier is configured to change in four stages by 10 times.

In this embodiment, as an example, the number of optical sensors S ₁ to S _n is the 30 (i.e., n = 30). However, this invention is not limited to this, For example, n = 5-100 etc. can be set arbitrarily.

  The optical measuring device 100 includes an A / D converter 2, a CPU 1 that is an arithmetic control unit, a ROM 3 and a RAM 4 as storage means, a display unit 5, and an operation unit 6.

The A / D converter 2 converts analog signals input from the plurality of optical sensors S _{1 to} S _n into digital signals and inputs them to the CPU 1.

  The CPU 1 comprehensively controls the operation of the optical measuring device 100 in accordance with programs and data stored in the ROM 3. In particular, in this embodiment, the CPU 1 has the function of the measurement unit 11 as a measurement unit that obtains information related to the characteristics of the light to be measured based on the digital signal input from the A / D converter 2. In addition, as will be described in detail later, the CPU 1 has functions of a range switching unit 12 as a range switching unit, a level determination unit 13 as a level determination unit, and a display information generation unit 14 as a display information generation unit. The CPU 1 embodies each unit that performs the above functions by performing arithmetic control processing according to predetermined programs and data read from the ROM 3.

  The ROM 3 stores programs and data for the CPU 1 to perform control according to it. The RAM 4 temporarily stores data such as measurement data written under the control of the CPU 1.

Display 5, in addition to displaying information relating to the characteristics of the light to be measured is determined by the CPU 1, as will be described in detail later, setting range setting screen D ₁ (FIG. At the range of the optical sensor S ₁ to S _n 2) is displayed. The display 5 performs a predetermined display on the display 5 according to a signal generated by the display information generation unit 14 of the CPU 1.

  The operation unit 6 is used to input information such as measurement start / end instructions and various set values to the CPU 1. The operation unit 6 can be provided separately from the display device 6, but can also be configured as a so-called touch panel integrated with the display device 5.

When measuring light to be measured by the optical measuring device 100, current generated by photoelectric conversion by the photoelectric conversion elements E ₁ to E _n which receives the measured light, the detection circuit (current detection circuit) C ₁ -C _n is converted to voltage.

Signal from the optical sensor S ₁ to S _n are input to the A / D converter 2, is A / D converted by the A / D converter 2 is taken into CPU1 is an arithmetic control unit.

In CPU1 measurement unit 11, and the spectral sensitivity characteristic of the optical sensor S ₁ to S _n (which is measured in advance and stored), the intensity of the signal from the optical sensor S ₁ to S _n, based on, the measured The characteristics of the light to be measured such as light chromaticity and light intensity are calculated. The display information generation unit 14 inputs a signal for displaying the result obtained by the measurement unit 11 on the display 3 to the display 5.

In this embodiment, the range setting of the optical sensor S ₁ to S _n are auto or fixed is adapted to be selected. Either the setting of the optical sensor S ₁ to S _n ranges automatic, is either a fixed, selected by a user by a key input from the operation unit 6 instructs the range switching portion 12 of CPU1 as range switching means Is done. Range switching unit 12 can switch independently each range of a plurality of optical sensors S ₁ to S _n.

When the setting range in an automatic, range of the optical sensor S ₁ to S _n is set to be the optimum range. In this embodiment, the ROM 3 stores information related to the full scale (for example, 2V) of the A / D converter 2, and the range switching unit 12 of the CPU 1 is stored in the ROM 3 when measuring the measured light. reads information about the full scale of the a / D converter 2 which are, by comparing the respective optical sensors S ₁ to S _n and input to the a / D converter 2, the level of the input exceeds the full scale Always select the optimal range and switch automatically so that no range over occurs.

On the other hand, when the set range is fixed, the range of the optical sensor S ₁ to S _n are fixed from the optical sensor S ₁ to S _n regardless of the inputs to the A / D converter 2, the set range Is done. The range of each of the optical sensors S _{1 to} S _n can be manually switched at an arbitrary time point when the user instructs the range switching unit 12 of the CPU 1 by key input from the operation unit 6. Therefore, once the range setting is fixed, the range is not changed until it is manually switched or the range setting is made automatic.

In this embodiment, the measurement time screen D ₂ is a screen displayed in the display unit 5 of the optical measuring instrument 100 at the time of measurement is the same as the conventional one described with reference to FIG. In the illustrated example, the display and displays the measurement result I ₁ of the light flux and chromaticity of the light to be measured, whether the setting of the optical sensor S ₁ to S _n range to either fixed to the automatic selection state I ₂ and also the optical sensor S ₁ to S _n of any when the set to a fixed range displays that I ₃ is over range when being measured over range.

  Here, as described above, for example, when selecting a product of a light source to be measured (for example, LED) on a production line or measuring variation in light emission color, the measurement target input to the optical measuring device 100 is used. In many cases, the light is pulsed light. In this case, if the range is automatically set, it is difficult to switch the range to the blinking of the light to be measured input to the optical measuring device 100, and it is difficult to measure in the optimum range. It becomes. Therefore, in such a case, the range can be set in advance and fixed for measurement.

The optical measurement instrument 100 of this embodiment sets the range in advance, when fixing, so as not to over range occurs such as by variation of the intensity of the measurement target light source during the measurement, the optical sensor S ₁ In order to make it easy to set the range of .about.S _n, the display 5 is controlled to display a range setting screen D ₁ (FIG. 2 or the like) which is a screen D ₁ at the time of setting the range.

For example, when measuring with a range fixed on a production line or the like, the measurement target light source serving as a reference (representative value) of the light to be measured is turned on by DC, and this light is automatically set to the range of the optical measuring instrument 100. Switch to and measure. Thus, the range of the optical sensor S ₁ to S _n is optimized automatically.

It shows an example of a range setting screen D ₁ in FIG. When you a range set as described above to automatically measures the measured light reference (typical), the level determining unit 13 of CPU1 as level decision means, the plurality of optical sensors S ₁ to S _n for each current range, the current level of the input from each of the plurality of optical sensors S ₁ to S _n is determined. In this embodiment, the level judging unit 13 is stored in the ROM 3, reads the information about the full scale of the A / D converter 2, the input from the optical sensor S ₁ to S _n to the A / D converter 2 To determine what percentage the input level is relative to the full scale. In this embodiment, the range of the optical sensor S ₁ to S _n is capable of range switching in four stages ranges numbers 1, level determination section 13 above the current level in association with the range number Determine.

Next, the display information generation unit 14 of CPU1 as the display information generating means, respectively the identification information capable of identifying a plurality of optical sensors S ₁ to S _n, for each of a plurality of optical sensors S ₁ to S _n of A signal for displaying the level list T expressed in association with the current level information is generated, and the signal is input to the display 5. Thus, the display device 5, according to a signal for displaying the input level list T in range setting screen D _1, it is possible to display the range setting screen D ₁ include a level list T. The display information generation unit 14, the addition to the current level of information, the information for displaying the range of the currently selected for each photosensor S ₁ to S _n is the identification information of the optical sensors S ₁ to S _n A signal may be generated for displaying the level list T associated with the.

In this embodiment, as shown in FIG. 2, the display information generation unit 14, for each PD number (PD1~PD30) as identification information of the optical sensors S ₁ to S _n, and the current range number, A / A level list T in which the current input level (ratio to the range (%), A / D level) with respect to the full scale of the D converter 2 is associated is displayed.

Thus, each optical sensor S ₁ to S _n, by displaying a list of what percentage of the level for the current range and the range is entered, the user of the optical sensors S ₁ to S _n You can easily check if the range setting is optimal.

  In the present embodiment, the current level is displayed as a numerical value. However, the present invention is not limited to this. For example, as shown in FIG. 3, each level is displayed as a graph using a bar graph or the like. You can also.

In this state, the user switches the set range is fixed, to secure the range of the optical sensor S ₁ to S _n in the current range. Range switching unit 12 records the current range numbers of each optical sensor S ₁ to S _n in the RAM 4.

User checks the level of the current input to each range of each optical sensor S ₁ to S _n in the level list T, if either of the range is also determined that there is no need to manually change each of the optical sensors S ₁ without changing the range of to S _n, while the set range is fixed, it is possible to measure light of the measurement target light source which is, for example, pulsed light. On the other hand, for the user, the amount of change to be expected of the intensity of the light to be measured, for example, the range of variations due to light emission amount of the individual difference such as measurement target light source serving LED in the production line, each range of the optical sensor S ₁ to S _n based like the current input level, for either of the optical sensors S ₁ to S _n, or when it is determined that there is a possibility that the range over the actual time of measurement of the measured light in the current range, By instructing the range switching unit 12 by key input from the operation unit 6, the range can be manually changed. The range switching unit 12 records the changed range number in the RAM 4. After that, it is possible to measure the light from the measurement target light source that is, for example, pulsed light while the range setting is fixed.

In the present embodiment, the user instructs the display information generating unit 14 of the CPU 1 to switch the display on the display 5 by a key input from the operation unit 6 that functions as a display switching instruction unit. The screen to be switched is switched between a measurement time screen D ₂ as shown in FIG. 8 and a range setting time screen D ₁ as shown in FIG. As described above, in the present embodiment, the display information generation unit 14 displays a signal for displaying the level list T and information related to the characteristics of the light to be measured in response to an instruction from the operation unit 6. Are selectively input to the display 5. Thereby, the setting of each range can be displayed only when necessary, and operability can be improved.

Here, in order to make it easy for the user to check the current input level for each range and to prompt the user to change the range, in the level list T, the current input level is the intensity of the light to be measured. for information on the optical sensor S ₁ to S _n has reached the range generally range over is considered likely to occur by varying, can be displayed in other things different display modes.

In more detail, first, the level judging unit 13, the current level for each of the plurality of optical sensors S ₁ to S _n it is determined whether more than a predetermined first level (e.g., 80%) be able to. Then, the display information generating section 14, at least one item of information levels in the list T relates to an optical sensor S ₁ to S _n determined that the level determining unit 13 exceeds the first level (e.g., an optical sensor S ₁ identification information to S _n, the information of the current range, the information of the current level, or combinations thereof), in a display mode different from the optical sensor S ₁ to S _n information on other than so those determined A signal for display can be input to the display 5. Accordingly, when the increased strength of the measured light, as the light sensor S ₁ to S input level from _n be in the range over which greater than the full scale of the A / D converter 2 does not occur In addition, the user can be prompted to change the range manually. For example, in the example of FIG. 2, the terms first optical sensor S ₁ has a level of level greater than 80% as a to S _n, is set so as to blink the display of the level, PD 19, PD 20 current It blinks because the input level for the range is 85% and 90%.

Further, if the level judging unit 13, the current level for each of the plurality of optical sensors S ₁ to S _n is below the first level smaller predetermined second level than (e.g. 20%) or not Can be determined. Then, the display information generating section 14, the level judging unit 13 (such as level display) at least one item of information in the second optical sensor S ₁ is determined to be below the level of the to S _n-level lists for T and it can be input to the display unit 5 a signal for displaying in a different display mode information about the optical sensor S ₁ to S _n other than such a judgment is made. As a result, when the intensity of the light to be measured is reduced, the user does not have the input level from the optical sensors S _{1 to} S _n too low with respect to the full scale of the A / D converter 2. Can be prompted to change the range manually. For example, with respect to the optical sensor S ₁ to S _n which is a level of less than 30% as the second level, it is possible to blink the display of the level.

Further, the level judging unit 13, the current level for each of the plurality of optical sensors S ₁ to S _n is the second level (e.g., 20%) was below or above the first level (e.g., 80% ) Can be determined. Then, the display information generating section 14, level by the determination unit 13 of at least one in the second or below the level of the optical sensor S ₁ is determined to exceed the first level to S _n level list for T the items of information (such as the level display), can be input to the display unit 5 a signal for displaying in a different display mode information about the optical sensor S ₁ to S _n other than such a judgment is made . As a result, it is possible to cope with cases where the intensity of the light to be measured increases and decreases.

Further, the user inputs the rate of change in intensity of the light to be measured, taking into account the variation in the intensity of the measured light, the optical sensor S ₁ to S _n likely will range over the level list It is possible to prompt the user to change the range by blinking the display in T.

For example, when the intensity of light emitted from a light source to be measured fluctuates in a production line of a light source device (LED or the like), the entire emission spectrum as a reference is usually shifted to a high intensity side or a low intensity side. Therefore, from the relationship between the intensity of the received light amount and the output signal of the optical sensor S ₁ to S _n are obtained in advance, and the expected fluctuation range of the intensity of the measured light, the optical sensor S ₁ to S _n It can be determined whether the input to the A / D converter 2 fluctuates and exceeds the full scale of the A / D converter 2, or whether it becomes too small with respect to the full scale.

More specifically, the user inputs information related to the fluctuation range of the intensity of the light to be measured to the level determination unit 13 by key input from the operation unit 6 functioning as a fluctuation range input unit. As shown in FIG. 4, the input value V ₁ of this fluctuation range can be displayed on the range setting screen D ₁ . Then, first, the level judging unit 13, when the intensity of the measured light is changed by the fluctuation range, the level of the input from the plurality of optical sensors S ₁ to S _n varies from the current level, given It can be determined whether a third level (eg, 100%) may be exceeded. In this case, the display information generating section 14, the level judgment section 13 of at least one item in the level list T relates to an optical sensor S ₁ to S _n which is judged to may exceed the third level information (level a display, etc.), can be input to the display unit 5 a signal for displaying in a different display mode information about the optical sensor S ₁ to S _n other than such a judgment is made. Level determining unit 13, based on the information indicating the relationship between the intensity of the received light amount and the output signal of the optical sensor S ₁ to S _n which is previously stored in the ROM 3, the variation intensity of the measured light by the fluctuation range when the input to the a / D converter 2 determines whether or not can exceed the full scale of the a / D converter 2 from the optical sensor S ₁ to S _n. Accordingly, when the increased strength of the measured light, as the light sensor S ₁ to S input level from _n be in the range over which greater than the full scale of the A / D converter 2 does not occur In addition, the user can be prompted to change the range manually. For example, in the example of FIG. 4, the input levels with respect to the current ranges of the PD 19 and PD 20 are 85% and 90%, and at this level, 50 is the amount of change in the intensity of the measured light input from the operation unit 6. % (Meaning that the intensity of the light to be measured fluctuates by ± 50% based on the current measurement result.) When the intensity of the light to be measured fluctuates by This is indicated by a flashing display.

Further, the level judging unit 13, when the intensity of the measured light is changed by the fluctuation range, the level of the input from each of the plurality of optical sensors S ₁ to S _n is varied from the current level, said first It can be determined whether or not a predetermined fourth level (for example, 1%) that is smaller than the level of 3 may be exceeded. In this case, the display information generating section 14, the level judgment section 13 of at least one item in the level list T relates to an optical sensor S ₁ to S _n which is determined as being be less than the fourth level information (level a display, etc.), can be input to the display unit 5 a signal for displaying in a different display mode information about the optical sensor S ₁ to S _n other than such a judgment is made. As a result, when the intensity of the light to be measured is reduced, the user does not have the input level from the optical sensors S _{1 to} S _n too low with respect to the full scale of the A / D converter 2. Can be prompted to change the range manually. As described above, not only the range over but also the input for the range is low, the display for prompting the range change can be performed.

Further, the level judging unit 13, when the intensity of the measured light is changed by the fluctuation range, the level of the input from each of the plurality of optical sensors S ₁ to S _n is varied from the current level, said first It can be determined whether or not the level of 4 (eg, 1%) is below or above the third level (eg, 100%). In this case, the display information generating section 14, the level judging unit 13 by the fourth or below the level of or the third is level judged to may exceed the photosensor S ₁ to S _n regarding level list in T at least one item of information (such as the level display), the display unit 5 a signal for displaying in a different display mode information about the optical sensor S ₁ to S _n other than such a judgment is made inputs can do. As a result, it is possible to cope with cases where the intensity of the light to be measured increases and decreases.

  The first level and the third level may be the same or different. Similarly, the second level and the fourth level may be the same or different.

  In addition, the above-mentioned “different display modes” are not limited to this, but the display color, size, font, addition of characters / graphics / symbols, presence / absence of blinking, or a combination thereof may be varied. It is preferable that the display is highlighted. For example, when a level is displayed as a bar graph as shown in FIG. 3, it can be displayed by changing the color of the bar graph and emphasizing it.

As described above, in this embodiment, by displaying a level list T, user when setting the individual ranges of the plurality of optical sensors S ₁ to S _n, easy to confirm whether optimal each range Can be done. Further, the level list T can assist the user in changing the range so that the range is not over during the measurement.

Example 2
Next, another embodiment according to the present invention will be described. Since the basic configuration and operation of the photodetector of the present embodiment are the same as those of the first embodiment, elements having the same functions or configurations as those of the first embodiment are denoted by the same reference numerals. Detailed explanation is omitted.

FIG. 5 shows a schematic configuration of the optical measuring device 100 of the present embodiment. In this embodiment, when setting the range of the optical sensor S ₁ to S _n, so that each range can be automatically re-set based on the variation width of the intensity of the measured light is expected.

In this embodiment, the CPU 1 has a function as a reset signal generator 15 as a range reset signal generator. The range resetting signal generating means is for inputting a signal for resetting the range of a plurality of optical sensors S ₁ to S _n to the range switching unit 12 of the range switching means. Then, as described in the first embodiment, the reset signal generation unit 15 is based on the ratios of fluctuations in the intensity of the light to be measured input by the user based on the ratios of the optical sensors S _{1 to} S. _In the current range of _n , it is determined that the input level may exceed a predetermined third level (eg, 100%) or fall below a predetermined fourth level (eg, 1%) during actual measurement. for sensors S ₁ to S _n, changing the range automatically.

For example, in the same manner as described in the first embodiment, a measurement target light source serving as a reference (representative value) of light to be measured is DC-lit in advance, and this light is automatically set in the range of the optical measuring device 100. Te, measured and fixed in an optimized range for the optical sensor S ₁ to S _n. Range switching unit 12, for each PD number as identification information of each optical sensor S ₁ to S _n, the current range numbers of each optical sensor S ₁ to S _n of the time and its A / D levels RAM4 Record.

Then, the user inputs the ratio of the variation in the intensity of the light to be measured by key input from the operation unit 6 and instructs the resetting of the range. range of the optical sensor S ₁ to S _n of can be automatically set to.

Figure 6 shows an example of a range setting screen D ₁ in the present embodiment. In this embodiment, similarly to Embodiment 1, the range setting screen D _1, such as the level list T are displayed. In the first embodiment, in general, the input becomes too small with respect to the range over or the range in consideration of the variation in the intensity of the measured light from the ratio of the variation in the intensity of the measured light input by the user. it analogously as determined optical sensor S ₁ to S _n likely to occur, either the level determination unit 13 may for such range over the optical sensor S ₁ to S _n is determined that there may occur In addition, the display information generating unit 14 can input a signal for displaying the display R ₁ prompting the user to input a range resetting instruction to the display 5. Also in this embodiment, in the same manner as in Example 1, the display mode in the level list T of the optical sensor S ₁ to S _n etc. is determined to be able to occur over range, otherwise This can be different from the display mode for the optical sensors S _{1 to} S _n , thereby prompting the user to input an instruction to reset the range. Alternatively, the range may be reset automatically when the user needs to reset the range by inputting the rate of change in the intensity of the light to be measured.

More specifically, the user inputs information related to the fluctuation range of the intensity of the light to be measured to the level determination unit 13 by key input from the operation unit 6 functioning as a fluctuation range input unit. Then, the level judgment section 13, in a manner similar to that described in Example 1, when the intensity of the measured light is changed by the fluctuation range of the input from each of the plurality of optical sensors S ₁ to S _n It can be determined whether the level may vary from the current level and exceed a predetermined third level (eg, 100%). In this case, resetting signal generation unit 15 switches the range of the third optical sensor S ₁ to S _n which is judged to may exceed the level of the level judgment section 13, the intensity of the measured light is the Even if the input level from the optical sensor fluctuates in the fluctuation range and the current level fluctuates from the current level, the signal for resetting the input level to the range that does not exceed the third level is switched between ranges. Input to section 12.

Further, the level judging unit 13, when the intensity of the measured light is changed by the fluctuation range, the level of the input from each of the plurality of optical sensors S ₁ to S _n varies from the current level, given It can be determined whether or not it may fall below a fourth level (eg, 1%). In this case, resetting signal generation unit 15 switches the range of the optical sensor S ₁ to S _n which is determined as being be less than the fourth level of the level judgment section 13, the intensity of the measured light is the Even if the input level from the optical sensor fluctuates in the fluctuation range and the current level fluctuates from the current level, the signal for resetting the input level to a range that does not fall below the fourth level is switched between ranges. Input to section 12.

Further, the level judging unit 13, when the intensity of the measured light is changed by the fluctuation range, the level of the input from each of the plurality of optical sensors S ₁ to S _n is varied from the current level, said first It can be determined whether or not the level of 4 (eg, 1%) is below or above the third level (eg, 100%). In this case, resetting signal generation unit 15 switches the range of the optical sensor S ₁ to S _n which is judged to may exceed or the third level below the fourth level of the level judgment section 13 Even if the intensity of the light to be measured fluctuates within the fluctuation range and the input level from the optical sensor fluctuates from the current level, the input level falls below the fourth level or the third level. A signal for resetting to a range that does not exceed the level is input to the range switching unit 12.

  In the present embodiment, the range reset signal generator 12 generates the signal by instructing the generation of a signal for switching from the operation unit 6 functioning as a range reset instruction unit.

As described above, in this embodiment, the user is not required to set the individual ranges of the plurality of optical sensors S ₁ to S _n manually. Also, pre-entered by the user, the predicted value of the variation in the intensity of the light to be measured by setting a range of the optical sensor S ₁ to S _n in automatic, light of the measurement target light source is within the variation range Even if it changes, the range is not exceeded in all ranges, and accurate measurement is possible.

1 CPU1
2 A / D converter 3 ROM
4 RAM
5 display 6 operation unit 11 measuring unit 12 range change unit 13 level determination unit 14 display information generating section 15 re-set signal generating unit C ₁ -C _n detection circuits E ₁ to E _n photoelectric conversion elements S ₁ to S _n light sensor

Claims (6)

A photoelectric conversion element and a detection circuit that detects a signal received and output by the photoelectric conversion element, and selectively selects a plurality of ranges for measuring the signal of the photoelectric conversion element by switching a gain of the signal of the photoelectric conversion element A plurality of optical sensors each having a switchable detection circuit, an A / D converter for converting an analog signal input from the plurality of optical sensors into a digital signal, and the digital signal In a light measuring instrument having a display that displays information relating to the characteristics of the light to be measured,
Range switching means for independently switching the ranges of the plurality of photosensors;
Level determining means for determining a current level of input from each of the plurality of photosensors for each current range of the plurality of photosensors;
A signal for displaying a level list in which identification information that can identify each of the plurality of photosensors and information on the current level for each of the plurality of photosensors is displayed is input to the display. Display information generating means for
An optical measuring instrument comprising: The level determination means is configured to determine whether the current level of each of the plurality of photosensors exceeds (i) a predetermined first level, or (ii) a predetermined first smaller than the first level. Determining whether to fall below a level of 2 or (iii) below the second level or above the first level;
The display information generating means is determined by the level determining means to (i) exceed the first level, (ii) determine below the second level, or (iii) the first level. Information of at least one item in the level list relating to an optical sensor determined to be below a level of 2 or exceeding the first level is different from information relating to an optical sensor other than that determined A signal for display in a display mode is input to the display.
The optical measuring instrument according to claim 1. It has a fluctuation range input means for inputting information relating to the fluctuation width of the intensity of the light to be measured to the level determination means,
When the intensity of the light to be measured fluctuates within the fluctuation range, the level determination means changes the input level from each of the plurality of optical sensors from the current level, and (i) a predetermined third (Ii) whether it may be below a predetermined fourth level that is less than the third level, or (iii) below the fourth level, or Determining whether the third level may be exceeded;
Whether the display information generating means is determined by the level determining means (i) that it may exceed the third level, or (ii) whether it may be lower than the fourth level, Or (iii) information of at least one item in the level list relating to an optical sensor that has been determined to be below the fourth level or above the third level, so determined A signal for display in a display mode different from information related to the optical sensor other than is input to the display.
The optical measuring instrument according to claim 1. A fluctuation range input means for inputting information relating to the fluctuation range of the intensity of the light to be measured to the level determination means;
Range reset signal generating means for inputting a signal for switching and resetting the ranges of the plurality of optical sensors to the range switching means;
Have
When the intensity of the light to be measured fluctuates within the fluctuation range, the level determination means changes the input level from each of the plurality of optical sensors from the current level, and (i) a predetermined third (Ii) whether it may be below a predetermined fourth level that is less than the third level, or (iii) below the fourth level, or Determining whether the third level may be exceeded;
The range reset signal generation means is determined by the level determination means to determine that (i) the third level may be exceeded or (ii) may be less than the fourth level. Or (iii) switching the range of the photosensors determined to be below the fourth level or exceeding the third level, and to be so determined by the level determination means A signal for resetting to a range having no is input to the range switching means.
The optical measuring instrument according to claim 1.   The different display modes are modes in which display colors, sizes, fonts, addition of characters / graphics / symbols, presence / absence of blinking, or combinations thereof are emphasized for display. Item 5. The optical measuring instrument according to any one of Items 2 to 4. Comprising display switching instruction means for instructing the display information generating means to switch the display on the display;
The display information generating unit selectively selects a signal for displaying the level list and a signal for displaying information related to characteristics of the light to be measured in response to an instruction from the display switching instruction unit. The light measuring device according to claim 1, wherein the light measuring device is input to the display device and displayed on the display device.

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