JPH073302Y2 - UV measuring device - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is capable of highly accurately measuring the intensity of light in the ultraviolet region of sunlight and the irradiation dose obtained by integrating the intensity with time, and a clock. The present invention relates to a small and portable ultraviolet ray measuring device which also has functions.

(Prior Art) The inflammation of the skin that occurs when the skin is exposed to sunlight for a long time is a result of the action of light in the ultraviolet region (ultraviolet rays) contained in the sunlight. The degree of skin irritation in this case is defined by the dose of ultraviolet rays irradiated. Here, the irradiation dose of ultraviolet rays is defined as the product of the intensity of ultraviolet rays (watt / m ² ) and the irradiation time (seconds), and its unit is represented by Joul / m ² .

Various expressions have been proposed as the expression format of this ultraviolet irradiation dose, but as an index related to the skin, ME
D (Minimum Erythema Dose) and SPF (Sun Protection Fa
ctor) is used.

Among these indicators, MED is a “slight erythema” when ultraviolet rays are applied to multiple parts of the skin with different irradiation doses.
It is defined by the minimum irradiation dose of ultraviolet rays required to induce. That is, the MED is a measure of the threshold for the skin, which gives an advance notice of the start of sunburn.

And this MED is said to have a unique value for each skin such as race and skin type.For example, it is said that the average MED of Japanese is about 91.7 kJ / m ² . .

On the other hand, SPF is an index showing how many times the above MED increases when sunscreen is applied to the skin.
In other words, it is an index showing how many times the amount of ultraviolet rays can be prevented by using the sunscreen as compared with the case where it is not used.

Therefore, between SPF and MED, the following equation: The relationship is established.

By the way, as a device for quantitatively measuring light in the ultraviolet region of sunlight, conventionally, on the light-receiving surface of a silicon photodiode having a spectral sensitivity in the ultraviolet region, the photodiode has a spectral sensitivity in a region other than the ultraviolet region. It is known that an ultraviolet transmission / visible absorption type colored glass filter is arranged. However, the above-mentioned colored glass filter has a sub-transmission band near the wavelength of 650 to 1000 nm in addition to the ultraviolet region, while the spectral sensitivity of the silicon photodiode extends to the infrared region. Not only that, it has spectral sensitivity even in the near-infrared region, which causes a problem of low measurement accuracy. In addition, the ultraviolet transmission / visible absorption type colored glass filter has a problem that the spectral transmittance changes when it is exposed to ultraviolet rays for a long time, so that the measurement accuracy and sensitivity change with time.

In order to solve such a problem, the inventors have already proposed a new type of ultraviolet ray measuring apparatus in Japanese Patent Application No. 62-155825. This device includes two light receivers, that is, a measurement-side light receiver and a reference-side light receiver, and the light-receiving elements of each light-receiver have the same spectral sensitivity. The device has a structure in which an optical filter that blocks only light in the ultraviolet region is arranged on the light receiving surface of the device, and is an apparatus that obtains the intensity of light in the ultraviolet region from the difference between the outputs of two light receivers.

In the case of this device, the output from the measurement side light receiver is the output based on the light in the entire region including the ultraviolet region, and the output from the reference side light receiver is the output based on the light in the region other than the ultraviolet region, The difference between the two outputs is based on only the light in the ultraviolet region. Then, by operating the arithmetic circuit based on this output, the intensity of light in the ultraviolet region and the integrated value of light intensity can be obtained.

(Problems to be solved by the device) However, when the ultraviolet measuring device of the above device is placed in sunlight to measure the intensity of light in the ultraviolet region, the visible light compensation accuracy is not very high. There's a problem.

For example, place this device in the sunlight and the intensity is 100w / m.
Considering the accuracy of visible light compensation when detecting light in the ultraviolet region of ² , the following results are obtained.

That is, in the measurement side receiver, the intensity of light in the ultraviolet region
Based on the 100 w / m ² and intensity 6400w / m ² of light in the region other than the ultraviolet region, the output corresponding to _{S 1 = 100 + 6400 = 6500w} / m 2 is obtained.

On the other hand, from the reference-side light receiver, an output corresponding to S ₂ = 6400 w / m ² is obtained based on only the intensity 6400 w / m ² of light in the region other than the ultraviolet region. Therefore, an output corresponding to S ₁ −S ₂ = 6500−6400 = 100 w / m ² is obtained from the differential amplifier circuit based on only the light in the ultraviolet region.

Assuming that the light detection accuracy in each light receiver is ± 1% of full scale, the measurement error in both light receivers is ± (6500 × 0.01) = 65 w / m ² .

Therefore, the visible light compensation accuracy in this device is S ₁ −
S ₂ = (6500 ± 65)-(6400 ± 65) = 100 ± 130 w / m ² . That is, the measurement error of this device is ± 130%.

By the way, measuring the intensity of light in the ultraviolet region means
The spectral distribution curve S of sunlight as shown in FIG.
In (λ), the intensity in the wavelength (λ) range of 180 to 390 μm is integrated.

When the integrated value is T, This is to obtain the area of the hatched portion in FIG.

On the other hand, on the light-receiving surface of the silicon photodiode having the spectral sensitivity in the ultraviolet region as described above, of the photodiode,
The spectral sensitivity in the ultraviolet range of the conventional device, which is equipped with an ultraviolet transmission / visible absorption type colored glass filter for killing the spectral sensitivity in the region other than the ultraviolet region, is
Due to the characteristics of the visible absorption type colored glass filter, as shown in FIG. 25, it has a mountain-shaped profile R (λ) and does not have a distinct boundary between the ultraviolet region and the visible light region. Therefore, the output obtained from the measuring device is, as shown in FIG. (However, R (λ) is a value corresponding to an intensity integrated value corresponding to the spectral sensitivity of the measuring device.

That is, T'is the 24th as shown by the diagonal lines in FIG.
The value is smaller than the area T in the figure. The ratio of these: T / T 'is 1.39. In other words, if no correction is made in this apparatus, the area portion having the intensity corresponding to TT 'out of the hatched areas in FIGS. 24 and 25 cannot be measured.

In order to avoid such a problem, the spectral sensitivity of the device to the ultraviolet light is not a mountain-shaped profile like the spectral sensitivity shown in Fig. 25, but is not a mountain-shaped profile to the ultraviolet light. A trapezoidal profile is preferred.
However, to date, no optical filter that provides the above-described spectral sensitivity over a wavelength in the ultraviolet region is known.

In addition, this device can display the intensity of light in the ultraviolet region by a number, but depending on the user, not only the displayed number but also the degree of the intensity of the light in the ultraviolet region that is actually exposed. For example, there is a demand to know what is known in a bar graph at a glance, and to make a decision to take an action such as prevention of sunburn.

The purpose of this device is to solve the above-mentioned accuracy problem in the device of the above-mentioned device, so that its spectral sensitivity becomes a trapezoidal profile instead of a mountain-shaped profile in the ultraviolet region.
By improving the structure of the light receiving part and further meeting the above-mentioned demands, the intensity of light in the ultraviolet region of sunlight can be measured with high accuracy and high sensitivity, and the intensity measurement values can be integrated to obtain the irradiation dose. It is possible to measure these intensity, irradiation dose, directly by digital number or multi-step display means, based on those data, such as a tanning notice function or a function to issue a warning from the degree of tanning performance, Various functions can be displayed to the user in a bar graph,
An object is to provide a small and portable ultraviolet device.

(Means for Solving the Problems) This invention for achieving the above-mentioned object is to provide a measuring-side photodetector including a photodetector having a spectral sensitivity in the ultraviolet region, and a photodetector having the same spectral sensitivity as the photodetector. On the light-receiving surface of the reference optical receiver having a first optical filter that blocks only light in the ultraviolet region, and the interference filter and the interference filter disposed on the light-receiving surfaces of the measurement-side optical receiver and the reference-side optical receiver. A light receiving portion provided with a composite filter composed of a quartz diffuser plate or a quartz concave lens arranged on the front surface of the light receiving surface of the interference filter; the light intensity in the ultraviolet region depending on the difference between the outputs of the measurement side light receiving device and the reference side light receiving device. And a calculation circuit unit for calculating the integrated value of light intensity; and a display unit for displaying a calculation value obtained from the calculation circuit unit.

The device of the present invention comprises two light receivers, a measurement side light receiver and a reference side light receiver. The measurement side light receiver is composed of a light receiving element, for example, a silicon photodiode. On the other hand, the reference side light receiver has a light receiving element having the same spectral sensitivity as that of the light receiving element used for the measurement light receiving device, and is composed of, for example, a silicon photodiode, and the first light receiving surface of the light receiving element. Optical filter, for example, a colored glass filter.

Then, on the light receiving surfaces of the two light receivers, that is, the light receiving surface of the light receiving element used in the measurement side light receiver and the light receiving surface of the first optical filter described above, a composite filter described later is arranged. There is.

As shown in FIG. 7, the light-receiving elements used in the measurement-side light receiver and the reference-side light receiver have spectral sensitivity not only in the ultraviolet region but also in the ultraviolet region to the infrared region. In FIG. 7, λ is the wavelength and R is the spectral sensitivity. On the other hand, as shown in FIG. 8, the first optical filter arranged on the light receiving surface of the light receiving element of the reference side light receiver blocks only the light in the ultraviolet region, and the light in other regions. Is a so-called sharp cut type colored glass filter.

In addition, as shown in FIG. 9, the composite filter arranged on the light receiving surfaces of the two light receivers has a main transmission band with a half-value width of 10 to 20 nm in the ultraviolet region and a low-order sub-band in a wavelength region twice that of the main transmission band. An interference filter having a transmission band and a quartz diffuser plate or a quartz concave lens, which is disposed on the light receiving surface of the interference filter and transmits the light in the ultraviolet region, are integrally formed in close contact with each other.

At this time, the light incident on the quartz diffuser plate and the quartz concave lens can be made uniform by appropriately controlling the degree of minute irregularities on the quartz diffuser plate, and in the case of the concave quartz lens, by appropriately controlling the focal length. Can be changed to a diffused state, so that the light that has entered the quartz diffuser plate or the quartz concave lens from any direction will always enter the interference filter located behind at various incident angles. .

As a result, the interference filter has the property that the main transmission band shifts to the shorter wavelength side as the incident angle of light increases, so it is converted into various incident angles by the quartz diffuser plate and the quartz concave lens. , The light transmitted through this interference filter is, as shown in FIG. 10, the light in the ultraviolet region having a trapezoidal profile in which the main transmission band and the sub-transmission band of this interference filter are connected to the short wavelength side. Become.

That is, by passing through this composite file, light in the ultraviolet region having a trapezoidal profile instead of a chevron shape is obtained, so that the spectral sensitivity of the device based on it is also trapezoidal. At this time, when the sunlight passes through the composite filter and is received by the measurement side photodetector, the output corresponding to the light in the sub-transmission band is 150 It becomes a ratio of about%.

In FIGS. 8, 9, and 10, λ is the wavelength, T is the spectral transmittance, and R is the relative spectral transmittance.

Therefore, in the reference-side light receiver, the composite filter transmits light in the ultraviolet region of the profile shown in FIG.
Subsequently, with respect to this light, only the light in the ultraviolet region is blocked by the first optical filter arranged on the light receiving surface of the light receiving element of the reference side light receiver, and the light in the sub-transmission band is transmitted through this first optical filter. And reaches the light receiving element. Then, from the reference side light receiver, regarding the light in this sub-transmission band, the spectral sensitivity of the light receiving element and the first
And the spectral sensitivity given by the product of the spectral transmittance of the composite filter is output. The relative spectral sensitivity at that time is as shown in FIG.

On the other hand, in the measurement light-receiving side device, the ultraviolet light having the profile shown in FIG. 9 reaches the light-receiving element by the composite filter. Then, the measurement side light receiver outputs the spectral sensitivity given by the product of the spectral sensitivity of the light receiving element and the spectral transmittance of the composite filter. The relative spectral sensitivity at that time is
It looks like Figure 12.

The output of the difference between the output from the measurement side light receiver and the output of the reference side light receiver is based on only the light in the ultraviolet region because the output based on the spectral sensitivity due to the light in the sub-transmission band is canceled. . The output of the output difference at this time is an output based on the relative spectral sensitivity as shown in FIG.

In FIGS. 11, 12, and 13, λ is the wavelength and RS is the relative spectral sensitivity.

Therefore, in order to obtain the difference between the outputs of the photodetectors, the output of each photodetector is amplified by the input circuit section 40 at the subsequent stage, AD-converted, and supplied to the arithmetic circuit section 50 to obtain the light intensity in the ultraviolet region. Then, as will be described in detail later, it can be integrated over time, and the liquid crystal display unit 60 can display information regarding the light intensity in various ultraviolet regions and the integrated value based on the respective values.

(Function) First, the intensity of the calculation circuit unit is adjusted so that the output of the calculation circuit unit becomes zero in a state where the composite filter arranged on the light-receiving surface of the measurement-side light receiver and the reference-side light receiver is not exposed to sunlight. Adjust the arithmetic circuit.

Next, the measurement-side photodetector is exposed to ultraviolet light of a desired intensity within the main transmission band to adjust the gain of the measurement-side photodetector. Further, an equal amount of light in the sub-transmission band is applied to both light receivers, and the gain of the reference light receiver is adjusted so that the difference between the outputs of both light receivers becomes zero.

As a result, the output of the difference between the outputs of the two light receivers obtained from the above-described intensity calculation circuit becomes an output based only on the light in the ultraviolet region, and the intensity of the light in the ultraviolet region is calculated based on this output. Moreover, since this output covers the ultraviolet region based on the trapezoidal relative spectral sensitivity shown in FIG. 13,
It accurately represents the intensity of the ultraviolet light that is exposed. Further, the arithmetic circuit section performs various calculations based on the light intensity data, and the obtained calculated values are displayed on the display means.

(Embodiment) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

External Configuration of the Device FIGS. 1 and 2 are a plan view and a side view showing the external appearance of a wrist watch type ultraviolet measuring device according to the present invention. The outer diameter is about 50 mm, which is slightly larger than a normal wrist watch. The belt 2 attached to both sides of the disk-shaped container (case) 1 is worn on the arm of the user to measure the intensity of ultraviolet rays. A light receiving part for receiving light in the ultraviolet region of sunlight in the container 1, an input circuit part for converting an analog signal into a digital signal after amplifying an output signal from the light receiving part, a signal read from the input circuit part Based on the above, a calculation circuit unit for calculating the light intensity and the like in the ultraviolet region, a liquid crystal display unit for displaying the light intensity and the like in the ultraviolet region calculated by this calculation circuit unit, and the like are housed.

The upper surface 1a of the container 1 is provided with a half-moon shaped light receiving window 3 and a half moon shaped display window 4, and the light receiving window 3 includes
The light-receiving surface of the light-receiving portion described below is exposed. In the display window 4, the digital number display section 4a that digitally displays the time (time) and the light intensity in the ultraviolet region with a four-digit number, and the light intensity in the ultraviolet region or its irradiation dose is No. 1 in the bar graph. The multi-level intensity display section 4b capable of displaying five levels up to No. 5 and the measurement mode display sections 4c and 4d for displaying the mode at the time of measurement, which will be described later, are visible. Two measurement mode displays
4c and 4d display intensity mode and integration mode, respectively. The digit of each digit of the digital numeral display portion 4a is made of a liquid crystal of 7 segments, and the liquid crystal is also used for the other display portions 4b, 4c, 4d. Note that these display sections 4a to 4d are LE
D can also be used.

An inclined surface 1c is formed between the side wall 1b and the upper surface 1a of the container 1. The half-moon shaped switches SW1 and SW2 are provided at positions opposite to each other on the inclined surface 1c. The switches SW1 and SW2 are push-button type on / off switches for selectively switching the arithmetic mode of the arithmetic circuit unit and setting the clock as described later. Every time these switches SW1 and SW2 are pressed, one pulse is generated and input to the arithmetic circuit section.

FIG. 3 is an enlarged side view of the one switch SW2, and since the switches SW1 and SW2 are provided on the inclined surface 1c, malfunction of the switch is prevented. That is, for the moment,
When the switch is attached to the side wall 1b of the container 1 as shown by the phantom line SW2 'in the figure, since this ultraviolet measuring device is a wristwatch type, the switch SW2' may touch a bent wrist or touch it. If something comes into contact with it, the switch 6b 'will malfunction easily. This ultraviolet ray measuring device is often operated for a long time because it is necessary to integrate the light intensity in the ultraviolet region, and if the switch malfunctions, the stored integrated value of the light intensity in the ultraviolet region will be stored. The inconvenience of disappearing occurs. By providing the switches SW1 and SW2 on the inclined surface 1c, such inconvenience is less likely to occur.

FIG. 4 shows the back surface 1d of the ultraviolet ray measuring device. A back lid 7 is attached to the back surface 1d by screws 8 in a liquid-tight manner such as a waterproofing. When the back lid 7 is opened, the mercury battery 5 is replaced. Can be done easily. That is, unlike the ordinary wristwatch, the back cover 7 is screwed to the container 1 with the screw 8, so that even a person who is not an expert such as a watch technician can remove the screw 8 to open the back cover 7. As a result, the battery 5 can be easily replaced.

Circuit Configuration Next, the configuration of the circuit housed in the container 1 of the ultraviolet ray measuring apparatus of the present invention will be described with reference to FIGS. 5 and 6.

First, the entire circuit is configured by including a light receiving circuit section 3A, an input circuit section 40, and an arithmetic circuit section 50 including a drive circuit and the like.
Liquid crystal display 60 consisting of etc. and a buzzer for generating an alarm sound
70 is connected.

[Light receiving circuit part]

The light receiving circuit section 3A includes a measurement side light receiver 10, a reference side light receiver 20, and a composite filter 30. The measurement side light receiver 10 is, for example, a model S1227 series photodiode (light receiving element) 101 manufactured by Hamamatsu Photonics KK having a spectral sensitivity as shown in FIG. 7, and the reference side light receiver 20 is the photodiode described above. A photodiode (light receiving element) 201 having the same spectral sensitivity as 101 and a light receiving surface of the photodiode 201, which has a spectral transmittance as shown in FIG.
For example, from the UV cut color glass filter (first optical filter) 202 such as model L-39 manufactured by HOYA,
Each is configured. Photodiodes 101 and 201
As shown in FIG. 7, it has not only the ultraviolet region but also the spectral sensitivity from the ultraviolet region to the infrared region.
In FIG. 7, λ is the wavelength and R is the spectral sensitivity.

On the other hand, as shown in FIG. 8, the first optical filter 202 arranged on the light receiving surface of the photodiode 201 on the reference side blocks only light in the ultraviolet region and transmits light in other regions. This is generally called a sharp cut type colored glass filter.

A composite filter 30 is arranged on the light receiving surfaces of both of the light receivers 10 and 20.

The composite filter 30 has a half width of 20 nm and a transmission line of 390 nm.
Interference filter (IF-W, manufactured by Nippon Vacuum Optical Co., Ltd.) 31
And a quartz diffusion plate 32 which is disposed in close contact with the light receiving surface of the interference filter and uniformly diffuses the incident light in the range of -70 ° to + 70 °.

This composite filter 30 has a structure of 290 to 390 as shown in FIG.
It transmits the ultraviolet rays of nm and the light of the sub-transmission band and blocks the light of other areas. When sunlight passes through this composite filter and is received by the receiver on the measurement side, the output corresponding to the light in the sub-transmission band is approximately 150% of the output corresponding to the light in the ultraviolet region (main transmission band). It becomes the ratio of. In FIGS. 8, 9, and 10, λ is the wavelength, T is the spectral transmittance, and RT is the relative spectral transmittance.

Therefore, in the reference side light receiver 20, the composite filter
At 30, only the light having the profile shown in FIG. 10, that is, the light in the ultraviolet region and the light in the sub-transmission band of the trapezoidal profile is selectively transmitted. Subsequently, of this light, only the light in the ultraviolet region is blocked by the first optical filter arranged on the light receiving surface of the photodiode 201 of the reference side light receiver 20, and the light in the sub-transmission band is blocked by the first optical filter. It passes through 202 and reaches the photodiode 201. Then, from the reference side light receiver 20, it corresponds to the spectral sensitivity given by the product of the spectral sensitivity of the photodiode 201 and the spectral transmittance of the first and second optical filters 202 and 30 with respect to the light in this sub-transmission band. The output is output. The relative spectral sensitivity at that time is as shown in FIG.

On the other hand, in the measurement side light receiver 10, the composite filter 30 blocks light other than the light in the ultraviolet region and the light in the sub-transmission band, and the light having the profile as shown in FIG.
Reach Then, the measurement side light receiver 10 outputs the spectral sensitivity given by the product of the spectral sensitivity of the photodiode 101 and the spectral transmittance of the composite filter 30. The relative spectral sensitivity at that time is as shown in FIG.

The difference between the output from the measurement side photodetector 10 and the output from the reference side photodetector 20 is based on only the light in the ultraviolet region because the output based on the spectral sensitivity due to the light in the sub-transmission band is canceled. is there. The output of the difference at this time is an output based on the relative spectral sensitivity as shown in FIG. Therefore, in order to obtain the difference between the photodetector outputs, the output of each photoreceiver is amplified by the input circuit section 40 in the subsequent stage, and then AD converted to perform the arithmetic circuit section 50.
To obtain the intensity of light in the ultraviolet region. And
As will be described in detail later, it can be integrated over time, and the liquid crystal display unit 60 can display information regarding light intensities in various ultraviolet regions based on the respective values.

[Input circuit section]

Next, explaining the input circuit section 40 which is an analog circuit,
Two amplifiers 401 and 402 are incorporated in the circuit unit 40, the amplifier 401 is connected to the measurement-side photodiode 101, and the amplifier 402 is connected to the reference-side photodiode 201. The output side of each amplifier 401, 402 is a switch circuit 4
This AD is connected to the AD converter (ADC) 403 via 06.
By the converter 403, the outputs S1 and S2 of each amplifier, which are analog signals, are converted into digital signals and supplied to the arithmetic circuit unit 50.

More specifically, the switch circuit 406 is switched according to a channel select signal from the arithmetic circuit unit 50 described later,
The output of the switched amplifier is supplied to the AD converter 403. Then, a digital signal corresponding to the amplifier output is output to the arithmetic circuit unit 50 by the sampling signal from the arithmetic circuit unit 50.

The feedback variable resistance 404 and
405 are connected in parallel, and the feedback variable resistors 404 and 405 allow the gain adjustment of the amplifier when the device is calibrated. Further, since the input circuit section 40 consumes a large amount of power, the power supplied to the circuit is controlled to be turned on / off by a control signal P1 from a power saving circuit 503 described later.

[Arithmetic circuit part]

The detailed configuration of the arithmetic circuit unit 50 is shown in FIG. 6, but this circuit configuration is an equivalent circuit, and actually, the central processing unit (CP
U), various storage devices (ROM, RAM, non-volatile RAM), LCD driver, etc. The calculation circuit unit 50 calculates the light intensity in the ultraviolet region based on the clock function (clock mode M1) and the light reception signal from the AD converter 403 of the input circuit unit 40, and based on the MED value from the calculated light intensity in the ultraviolet region. Predict sunburn,
A function to convert this into bar graph intensity data (intensity mode M2), a function to integrate the light intensity in the ultraviolet region to calculate an integrated value, and a function to convert this integrated light intensity value in the ultraviolet region into bar graph data (integrate Mode M3), the light intensity in the ultraviolet region is ME
Function to convert to D multiple value display (MED multiple mode M4), Function to convert ultraviolet light intensity integrated value to MED multiple value display (integrated MED multiple mode M5), Convert ultraviolet light intensity to SPF value display Function (SPF mode M6), the integrated value of the ultraviolet light intensity is S
A function to convert to a PF value display (total SPF mode M7) and an alarm function to issue an alarm when the calculated value exceeds a predetermined reference value based on the information about the light in the ultraviolet region obtained by these various calculation functions is doing.

As a circuit having a clock function, a clock circuit 516 that sequentially counts up or down by a divided clock pulse and updates time data every 0.5 seconds,
A stopwatch circuit 517, a clock circuit 516, and a stopwatch circuit 51 that count the lap time from the time of inputting the trigger signal and update the lap data every 0.5 seconds.
Clock data register that is connected to the output side of 7 and stores the time data or lap data calculated by these circuits
528, and a time correction circuit 515, which is connected to the input side of the clock circuit 516 and supplies clock pulses to the clock circuit 516 at different frequency division periods by operating the mode changeover switches SW1 and SW2 described later.

As a circuit for calculating the light intensity in the ultraviolet region, an AD converter
The received light data S1, S2 received by the measuring-side photoreceiver 10 and the reference-side photoreceiver 20 are sequentially fetched from 403, and the ultraviolet intensity Xs (unit W / m ² ) is calculated from these deviations (S1-S2). Intensity calculation circuit (visible light component compensation circuit) 501, intensity data register 519 for storing the light intensity calculation value Xs in the ultraviolet region of this intensity calculation circuit 501, and standard data Xsm that is predetermined as the MED value.
MED value memory 506 that stores the value, strength calculation circuit 501 on the input side
And multi-stage (5 steps) suitable for use as burn prediction information from the standard MED value Xsm stored in the MED value memory 506 and the light intensity Xs in the ultraviolet region calculated by the intensity calculation circuit 501 connected to the MED value memory 506. ) Bar graph strength calculation / comparator circuit 50 for calculating bar graph strength data (details will be described later)
9. A bar graph intensity data register 520 for storing calculation data of the calculation / comparator circuit 509.

As a circuit of the light intensity integrated value calculation function in the ultraviolet region, the light intensity Xs in the ultraviolet region calculated by the intensity calculation circuit 501 described above is added every predetermined time (every 0.5 seconds), and the integrated value Xa is calculated. Circuit 505, integrated data register 522 for storing this integrated value Xa, input side is connected to integrator 505 and MED value memory 506, and standard MED value Xsm stored in MED value memory 506 and integrated calculated by integrator circuit 505 Bar graph integration calculation / comparator circuit 510 for calculating multi-step (5-step) bar graph integration data (details will be described later) suitable for use as sunburn warning information from the value Xa, operation of this calculation / comparator circuit 510 A bar graph integrated data register 521 for storing data is provided. In addition, the bar graph integration calculation / comparator circuit 51
An alarm control circuit 523 is connected to the output side of 0,
Alarm control circuit when the bar graph value calculated by the bar graph integration calculation / comparator circuit 510 exceeds a specified value
The buzzer 70 is operated via 523.

As the circuit of the MED value calculation function, the input side is the strength calculation circuit 5
01 and MED value memory 506, from the standard MED value Xsm stored in the MED value memory 506 and the light intensity Xs in the ultraviolet region calculated by the intensity calculation circuit 501, the current light in the ultraviolet region continues for a predetermined time. A MED value calculation circuit 508 for predicting and calculating the MED value Xm when exposed to water, a MED multiple data register 526 for storing the MED value Xm, and the like are provided.

As a circuit having a function of calculating the integrated MED value, the input side is connected to the strength calculation circuit 501 and the MED value memory 506, and the strength calculation circuit 501 calculates from the time when a trigger signal from a mode changeover switch SW2 described later is input. The light intensity Xs in the ultraviolet region is integrated, and from this integrated value and the standard MED value Xsm stored in the MED value memory 506, the MED value Xmr (details described later) when the light in the ultraviolet region continues to be exposed to the present is calculated. A MED value calculation / accumulator circuit 514, an integrated MED multiple data register 527 for storing the MED value Xmr, and the like are provided. In addition, MED value calculation
An alarm control circuit 523 is connected to the output side of the integrator circuit 514 via a comparison circuit 513, and when the MED value Xmr exceeds a predetermined value, the alarm control circuit 523 activates the buzzer 70.

As the circuit for the SPF value calculation function, the input side is the strength calculation circuit 5
01 and MED value memory 506, from the standard MED value Xsm stored in the MED value memory 506 and the light intensity Xs in the ultraviolet region calculated by the intensity calculation circuit 501, the current light in the ultraviolet region continues for a predetermined time. An SPF value calculation circuit 507 for predicting and calculating the SPF value Xsp when exposed to water, an SPF value data register 524 for storing the SPF value Xsp, and the like are provided.

As a circuit having a function of calculating the integrated SPF value, the input side is connected to the strength calculation circuit 501 and the MED value memory 506, and the strength calculation circuit 501 calculates from the time when a trigger signal from a mode changeover switch SW2 described later is input. Ultraviolet light intensity Xs is integrated, and from this integrated value and the standard MED value Xsm stored in the MED value memory 506, the SPF value Xspr is calculated and integrated when the ultraviolet light continues to be exposed to the present Circuit 512,
Accumulated SPF value data register 525 that stores this SPF value Xspr
And so on. Further, the above-mentioned alarm control circuit 523 is connected to the output side of the SPF value calculation / accumulator circuit 512 via the comparator circuit 511, and when the SPF value Xspr exceeds a predetermined value, the alarm control circuit 523 causes the buzzer 70 to operate. Is designed to operate.

Note that each of the integrated data register 522, the bar graph integrated data register 521, the integrated MED multiple register 527, and the integrated SPF value data register 525 has a switch S as described later.
It has a hold function that keeps the previous measurement result unless a new integration start action is triggered by W2 switch operation.

The arithmetic circuit unit 50 detects a liquid crystal driver circuit 530 that drives each liquid crystal element of the liquid crystal display unit 60, and a liquid crystal driver circuit 530 that detects that the battery voltage has dropped below a predetermined voltage.
By intermittently driving the
A battery dead detection circuit 529 is provided to notify by blinking. In addition, a mode switching circuit 51 for switching and connecting the liquid crystal driver circuit 530 to one of the above-mentioned data registers.
The switching element 518a of the mode switching circuit 518 sequentially switches and connects the liquid crystal driver circuit 530 to one of the data registers in a predetermined order for each switch operation of the changeover switches SW1 and SW2. . Mode switching circuit 51
Details of the mode switching procedure according to 8 will be described later.

The arithmetic circuit section 50 is further provided with the above-mentioned power saving circuit 503 for controlling on / off of the power supply of the input circuit section 40. The power saving circuit 503 is connected to the intensity calculation circuit 501 via the intensity measurement time counter circuit 502, and is also connected to the integration circuit 505 described above via the integration time counter circuit 504.

Next, the operation of the ultraviolet ray measuring device configured as described above will be described.

Mode Switching First, a procedure for sequentially switching the modes by pressing the switches SW1 and SW2 will be described. The first switch SW1 on the right side of the container upper surface 1a outputs a pulse signal mainly used for mode switching, and the second switch SW2 on the left side.
Respectively generate pulse signals mainly used as trigger signals for starting integration.

Immediately after the battery 5 is attached to the ultraviolet ray measuring device, the clock mode M1 is selected, and the switch element 518a connects the clock data register 528 and the liquid crystal driver circuit 530. The LCD driver circuit 530 has a clock data register 5
The time data stored in 28 is read out, and the digital number display section of the liquid crystal display section 60 is read according to the read out time data.
The liquid crystal element 4a is applied to display the time (Fig. 14 (a)).

Then, when switch SW1 is pressed once, strength mode M2
Is selected, and the intensity data register 519 and the bar graph intensity data register 520 are connected to the liquid crystal driver circuit 530 by the switch element 518a of the mode switching circuit 518. At this time, the light intensity Xs in the ultraviolet region stored in the intensity data register 519 is stored in the digital number display unit 4a of the liquid crystal display unit 60, and the bar graph intensity data register 520 is stored in the bar graph display unit 4b. In addition to displaying the bar graph data, the measurement mode display section 4c on the right side is turned on to indicate that these displays are in the intensity mode (FIG. 14 (b)).

Furthermore, when the switch SW1 is pressed once, it means that the integration mode M3 has been selected, and the bar graph integration data register
The integrated data register 521 and the integrated data register 522 are connected to the liquid crystal driver circuit 530. In the digital number display section 4a of the liquid crystal display section 60, the integrated value Xa of the ultraviolet light intensity stored in the integrated data register 522 is displayed in the bar graph display section. The bar graph data stored in the bar graph integrated data register 521 is displayed in 4b, and the measurement mode display section 4d on the left side is displayed.
Is lit to indicate that these displays are in the integration mode (FIG. 14 (c)).

Similarly, every time the switch SW1 is pressed once, the MED
The modes are switched in the order of the mode M4, the integrated MED mode M5, the SPF mode M6, and the integrated SPF mode M7, and when the switch SW1 is further pressed, the mode returns to the clock mode M1 of FIG. 13 (a).

Further, the pulse signals of the switches SW1 and SW2 are both to be supplied to the alarm control circuit 523 described above, and the pulse signal activates the buzzer 70 via the alarm control circuit 523 to generate a buzzer sound. By playing the sound, the user can hear the buzzer sound and confirm whether or not the switch operation is reliably performed.

Main Routine Next, the control procedure of the main routine executed by the arithmetic circuit section 50 will be described with reference to FIG.

The main routine shown in FIG.
Is repeated from the time of mounting the battery until the battery 5 is removed, or until the battery 5 runs out of energy and the voltage drops below a predetermined value. First, after each register is cleared immediately after the battery 5 is installed, a repeating loop is entered, and it is determined whether or not 0.5 seconds, which is a predetermined cycle, has elapsed since the previous execution of this loop. If so, wait until the time has passed. Then, immediately after 0.5 second has elapsed, the data in the clock data register 528 is updated. This corresponds to counting the predetermined value corresponding to 0.5 seconds by the clock circuit 516 and updating the data value of the clock data register 528 every time the predetermined value is counted. Then, the routine corresponding to the designated mode selected by the switches SW1 and SW2 is executed. The details of the routine of each designated mode will be described later.

When the execution of the routine corresponding to the designated mode is completed, the display data is specified by the designated mode and the liquid crystal display unit
Update the display data of 60. This is the mode switching circuit 51
The switch element 518a is switched by 8 to connect the register corresponding to the designated mode to the liquid crystal driver circuit 530, read the data of the connected register into the liquid crystal driver circuit 530, and read the data of the liquid crystal display unit 60 according to the read data content. It corresponds to turning on the liquid crystal element.

In addition, totalization mode M3, totalization MED mode M5, totalization SPF mode M7
As will be described later, each mode of (1) is changed to another mode (for example, by a mode switch unless measurement end operation is performed by the switch SW2 or the measurement time exceeds a predetermined time (for example, 12 hours) and automatically ends. Even if the clock mode and intensity mode are being executed, the integrated measurement is continuously performed. Therefore, when each integration mode (M3, M5, M7) is selected again by mode switching, each ongoing integration measurement value is displayed on the liquid crystal display unit 60.

When the clock mode designation mode is set to the clock mode M1, an M1 routine (not shown) is executed. In this M1 routine,
Time adjustment processing and stopwatch processing are executed,
In the case of normal time display, nothing is done and the process returns to the main routine of FIG.

FIG. 16 shows a time adjustment processing procedure executed in the M1 routine. When the second switch SW2 is kept pressed for a predetermined time (for example, 1 second), the liquid crystal element at the time of the digital numeral display portion 4a blinks to indicate that the correction is possible. At this time, the time adjustment circuit 515 stops the supply of the clock pulse, and the clock circuit 516 is in the count standby state only for its upper bit (hour bit). Then,
When the first switch SW1 is pressed once, the time portion of the digital numeral display portion 4a is moved up by one, and when the switch 6a is continuously pressed, it is fast forwarded. That is,
A clock pulse for incrementing the above-mentioned upper bit by 1 is supplied from the time correction circuit 515 to the clock circuit 516, and when the switch SW1 is kept pressed, the clock pulse is continuously supplied to the clock circuit 516.

When the portion at the time of the digital numeral display portion 4a is set to the desired value, the switch SW2 is pressed once. Then, the liquid crystal element in the portion corresponding to the digital number display portion 4a blinks to indicate that the correction is possible. At this time, the clock circuit 51
In 6, only the lower bit (minute bit) of the 6 is in the count standby state. Then, as described above, the first switch SW1
When is pressed once, the portion of the digital numeral display portion 4a is moved up by 1, and when the switch SW1 is continuously pressed, it is fast forwarded.

In this way, when the hour and minute portions of the digital number display portion 4a have been set to the desired values respectively, the second switch SW2 is kept pressed for a predetermined time (1 second) as in the start, and the clock mode is set again. return. Return to watch mode and watch circuit 516
Restarts counting by supplying the clock pulse from the time correction circuit 515, and the digital number display section of the liquid crystal display section 60
The time is displayed in 4a.

Next, the stopwatch processing procedure executed in the M1 routine will be described. After selecting the timepiece mode by the first switch SW1, the second switch SW2 is continuously pressed twice to put the switchwatch circuit 517 into a standby state. . Although the clock circuit 516 continues counting clock pulses, it stops outputting time data, and instead the stopwatch circuit 517 starts outputting lap data. Then, when the second switch SW2 is pressed again, the stopwatch circuit 517 starts counting clock pulses,
Update the lap data. This lap data is updated every predetermined time (0.5 seconds), stored in the clock data register 528, and the lap time is displayed on the digital number display section 4a of the liquid crystal display section 60.

As described above, since the ultraviolet ray measuring device of the present invention has a normal clock function and a stopwatch function, the light intensity in the ultraviolet region and its integrated value, and further, from these data, MD
It is possible to deal with sunburn by finding P value, SPF value, etc. and comparing them with the time of exposure to sunlight and the time of future exposure.

Intensity Mode When the intensity mode M2 is selected by the first switch SW1, the intensity mode M2 routine shown in FIG. 17 is repeatedly executed every predetermined time (0.5 seconds).

When this mode is selected, first, the power saving circuit 503 outputs the control signal P1 to turn on the power of the input circuit unit 40.
Then, as described above, the ultraviolet light intensity signals S1 and S2 of the measurement-side photoreceiver 10 and the reference-side photoreceiver 20 converted into digital signals by the AD converter 403 are sequentially read by the intensity calculation circuit 501, and these received light data are received. The light intensity Xs in the ultraviolet region is calculated from the deviation (S1-S2). Then, the calculated light intensity Xs in the ultraviolet region is stored in the intensity data register 519 and updated with new data.

On the other hand, the bar graph intensity calculation / comparator circuit 509 is configured to store the ultraviolet light intensity Xs calculated by the intensity calculation circuit 501 and a MED value memory.
Using the standard MED value Xsm stored in 506, bar graph intensity data is calculated by the following equation (1).

Lighting No. = (Xs × Ts) / (Xsm × n) (1) where Xsm is, for example, the average MED of Japanese (90,000J /
m ² ) is set. This value Xsm may be appropriately changed according to the type of skin of the user. Ts is a fixed time, for example, 2 hours (7200 seconds), and n is a natural number of 1, 2, 3, ..., Which determines each bar graph lighting step. For example, n =
If 2, then each bargraph will illuminate every 2 MED increments.
As is clear from the above formula (1), the lighting No. is for the predetermined time Ts.
It shows how many times the standard MED value Xsm of ultraviolet light is exposed when the currently detected ultraviolet light intensity Xs continues to be exposed. The lighting No. is calculated from equation (1). It is given as a natural number that does not exceed the value indicated by 0 to 5 levels. Table 1 shows the relationship between the light intensity Xs in the ultraviolet region and bar graph intensity data when Xsm is set to 90,000 J / m ² , Ts is set to 2 hours (7200 seconds), and n is set to 1.

The bar graph intensity data calculated in this way is stored and updated in the bar graph intensity data register 520. And
The measurement time counter value stored in the intensity measurement time counter circuit 502 is incremented by 1 and whether the measurement time of the light intensity in the ultraviolet region exceeds the predetermined time (for example, 3 minutes) from the incremented measurement time count value Determine whether or not. When this predetermined time is not exceeded, the routine is repeatedly executed and the measurement of the light intensity Xs in the ultraviolet region is continued. If another mode is selected in the main routine before the predetermined time is reached, the power is turned off, the measurement time counter is reset to zero, and the measurement is completed.

The respective data stored and updated in the intensity data register 519 and the bar graph intensity data register 520 are displayed on the liquid crystal display unit 60 by executing the main routine as described above.

When a predetermined time (3 minutes) has passed, the mode designated by the switch SW1 is returned to the clock mode, the control signal P1 output from the power saving circuit 503 is stopped, and the power of the input circuit unit 40 is turned off. The measurement time counter value of the measurement time counter circuit 502 is reset to 0 and the routine is finished. As a result, the input circuit section with high power consumption
The 40 is prevented from being left on for a long time, and its power saving effect is great.

In this way, in the intensity mode, the light intensity Xs in the ultraviolet region is displayed as a digital number, and the light reception amount in the ultraviolet region after a predetermined time is displayed on the bar graph, so the light intensity Xs in the ultraviolet region is displayed.
In contrast, the future amount of sunburn can be predicted, and this makes it possible to prevent further excessive sunburn by using a cosmetic product having an appropriate SPF value.

Integration Mode FIG. 18 shows the processing procedure of the integration mode executed in the M3 routine. When the first switch SW1 is pressed a predetermined number of times, the integration mode is selected and the liquid crystal display unit 60 displays the integration data register. The previous measurement result stored in 522 and the bar graph integrated data register 521 is displayed.
When the second switch SW2 is pressed once in this state, the integrated data stored in these registers 522 and 521 is reset to 0, and the integration of the light intensity in the ultraviolet region is started. And. For example, when the continuous measurement time from the start of integration exceeds a predetermined time (maximum integration time, for example, 12 hours), the power saving circuit 503 automatically ends the integration,
Return to clock mode. If you want to end the integration measurement at the time when this predetermined time is not reached, switch SW2 for a predetermined time (for example, 1
Press and hold for more than a second) to complete integration and return to clock mode. Even if either measurement ends, the measurement result continues to be stored in the accumulated data registers 522, 521 (hold function) unless a new measurement start action is taken, so this measurement result will be displayed on the liquid crystal display unit 60 at a later date. When the display is desired, the integration mode may be selected by operating the switch SW1. Switch SW2 to 1 in this state
When pressed twice, the stored values in the integrated data register 522 and the bar graph integrated data register 521 are erased, the display is erased from the liquid crystal display unit 60, and new integrated measurement is started.

As described above, even if another mode (for example, a clock mode or an intensity mode) is executed by mode switching during execution of the integration mode, the integration measurement continues to be executed.

When the integration mode M3 is selected by the first switch SW1 and the second switch SW2 is pressed, the integration mode M3 routine shown in FIG. 19 is executed, and the integration of the light intensity in the ultraviolet region described above is started.

First, it is determined whether or not the integrated time counter value of the integrated time counter circuit 504 is 0. Since this determination is affirmative (Yes) immediately after the integration is started, the power saving circuit 503 turns on the power supply of the input circuit unit 40, and then the stored values of the integration data register 522 and the bar graph integration data register 521 are stored. Both are reset to 0. If such a process is executed once, the integrated time counter value becomes larger than 0, and therefore it is not executed again until the ending operation by the switch SW2 or the routine is ended by the automatic end. Therefore, in the main routine, even if another mode (for example, a clock mode or an intensity mode) is executed during execution of the routine, the integration routine continues to be executed.

Next, in the same manner as in the intensity mode described above, the intensity calculation circuit 50
1 calculates the light intensity Xs in the ultraviolet region and calculates it by the integrator circuit 505.
Supply to. The integrator circuit 505 updates the integrated value Xa by adding the light intensity Xs of the ultraviolet region calculated this time to the previously integrated value, and stores and updates this in the integrated data register 522. Since the integrated value Xa (J / m ² ) of light intensity in the ultraviolet region is added with the light intensity Xs (W / m ² ) in the ultraviolet region detected at every predetermined time (0.5 seconds), the following formula (2) ) Can be represented.

Light intensity integrated value in the ultraviolet region Xa = Xs × time (s) (2) This light intensity integrated value Xa in the ultraviolet region is equal to the total irradiation dose of light in the ultraviolet region, and eventually, the light intensity integrated value Xa in the ultraviolet region. Represents the degree of sunburn that has progressed to the present.

On the other hand, the bar graph integrating operation / comparator circuit 510 uses the integrated value Xa calculated by the integrator circuit 505 and the standard MED value Xsm stored in the MED value memory 506 to calculate the bar graph according to the following equation (3). Calculate integrated data.

Lighting No. = Xa / (Xsm × n) (3) Here, Xsm is set to an average MED (90,000 J / m ² ). This value Xsm may be appropriately changed according to the skin type of the user, as in the case of the bar graph intensity data. n
Is a natural number such as 1,2,3, ..., and determines each bar graph lighting step. For example, if n = 2, each bar graph is lit every 2 MED increments. The lighting No. represents how many times the total irradiation dose of the ultraviolet light that has hitherto hits the standard MED value Xsm. The lighting No. is a natural number that does not exceed the value calculated from Equation (3). And is represented by 0 to 5 steps. Table 2 shows the relationship between the light intensity integrated value Xa in the ultraviolet region and bar graph integrated data when Xsm is set to 90,000 J / m ² and n = 1.

The bar graph integrated data calculated in this way is stored and updated in the bar graph integrated data register 521 and is also compared with a predetermined value k _n (k _n = 1,2,3 ...) to calculate the bar graph integrated data. First matches this predetermined value k _n ,
That is, each time the value of the bar graph integrated data is incremented by 1, the buzzer 70 is operated via the alarm control circuit 523,
Sound an alarm sound. From this, it can be seen that the exposure dose that has been exposed exceeds a predetermined value k _n and inflammation is becoming dangerous.

Then, the integrated time counter value stored in the integrated time counter circuit 504 is incremented by 1 to determine whether or not there is a measurement end operation (press the switch SW2 for 1 second or more), and N
If it is O, it is further determined from the incremented measurement time count value whether or not the light intensity integrated time in the ultraviolet region exceeds a predetermined time (for example, 12 hours). When this predetermined time is not exceeded, the routine is repeatedly executed and the light intensity integration in the ultraviolet region is continued.

The respective data stored and updated in the integrated data register 521 and the bar graph integrated data register 522 are displayed on the liquid crystal display unit 60 by executing the main routine as described above. The integrated data register 521 and the bar graph integrated data register 522 have a hold function, and are held until a new measurement start action is taken, as described above. Therefore, the irradiation amount taken on the previous day can be recalled to the liquid crystal display unit 60 again.

There was a measurement end operation or a predetermined time (12 hours)
When the time elapses, the mode designated by the switch SW1 is returned to the watch mode, the control signal P1 output from the power saving circuit 503 is stopped to turn off the power of the input circuit unit 40, and the integration time counter circuit 505 performs integration. The time counter value is reset to 0 and the routine ends. As a result, it is possible to prevent the input circuit section 40, which consumes a large amount of power, from being left on for a long period of time, resulting in a large power saving effect.

In this way, in the integration mode, the ultraviolet light intensity integrated value Xa
Since it is displayed as a digital number and also as a bar graph, it is possible to judge the actual degree of sunburn by comparing it with the total irradiation dose of light in the ultraviolet range. Value cosmetics will be used immediately to prevent further sunburn in the future.

MED multiple mode M4 When the MED multiple mode is selected by pressing the first switch SW1 a predetermined number of times, the routine shown in FIG. 20 is repeatedly executed at the predetermined cycle (0.5 seconds). This MED multiple mode is the same as the standard MED value when the measured light intensity Xs in the UV region is continuously exposed to UV light of the same intensity for a predetermined time (for example, 1 hour). It predicts whether or not you will be exposed to UV light with double the MED value.

First, when the MED multiple mode is selected by pressing the first switch SW1, the power saving circuit 503 outputs the control signal P1 to turn on the power of the input circuit unit 40. Then, similarly to the case of the intensity mode, the intensity calculation circuit 501 calculates the light intensity Xs in the ultraviolet region, and supplies this to the MED multiple calculation circuit 508. The MED multiple calculation circuit 508 is the light intensity of the supplied ultraviolet region.
Using Xs and the standard MED value Xsm stored in the MED value memory 506, the MED multiple value is calculated by the following equation (4).

MED multiple value = (Xs × Tm) / Xsm (4) where Tm is a predetermined time, for example, 3600 seconds (1 hour)
Is set to. As is clear from the above equation (4), the calculated MED multiple value is the standard MED value (90,000
It shows how many times more UV rays than J / m ² ) it is exposed to. The standard MED value (90,000 J / m) used in the above equation (4)
^{Also in 2} ), an appropriate value may be used depending on the skin type (skin type, race) of the user of the ultraviolet ray measuring device.

The MED multiple value calculated by the MED multiple calculation circuit 508 is stored and updated in the MED multiple data register 526. Then, the measurement time counter value stored in the intensity measurement time counter circuit 501 is incremented by 1, and whether the measurement time of the light intensity in the ultraviolet region exceeds the predetermined time (3 minutes) from the incremented measurement time count value. Determine whether. If this predetermined time is not exceeded, the routine is repeatedly executed,
The calculation of the light intensity Xs in the ultraviolet region and the MED multiple value is continued.
If another mode is selected in the main routine when this predetermined time is not reached, turn off the power,
Further, the measurement time counter is reset to zero to finish the measurement.

The MED multiple value stored and updated in the MED multiple data register 526 is displayed on the liquid crystal display unit 60 by executing the main routine as described above. At this time, the MED multiple value may be digitally displayed on the digital numeral display portion 4a, or may be displayed in multiple stages as a bar graph on the bar graph display portion 4b.

After a lapse of a predetermined time (3 minutes), the mode designated by the switch SW1 is returned to the watch mode, the control signal P1 output from the power saving circuit 503 is stopped, the power of the input circuit 40 is turned off, and the strength measurement is performed. The measurement time counter value of the time counter circuit 502 is reset to 0 and the routine is finished.

Integrated MED Multiple Mode When the integrated MED multiple mode M5 is selected by pressing the first switch SW1 a predetermined number of times, the M5 routine of FIG. 21 is repeatedly executed at a predetermined cycle (0.5 seconds). This routine displays how many times the integrated value of the light intensity in the ultraviolet region corresponds to the standard MED value.

When this integrated MED multiple mode is selected by pressing the first switch SW1, it is first determined whether or not the integrated time counter value of the integrated time counter circuit 504 is zero. Immediately after this mode is selected, this count value is 0 (the determination result is affirmative).
0 power is turned on and accumulated MED multiple data register 527
The stored value of is reset to 0. If such a process is executed once, the integrated time counter value becomes larger than 0, and therefore it is not executed again until the ending operation by the switch SW2 or the routine is ended by the automatic end. Therefore, in the main routine,
Even if another mode (for example, a clock mode or an intensity mode) is executed during execution of the routine, the integration routine continues to be executed.

Then, as in the case of the intensity mode, the intensity calculation circuit 501
Calculates the light intensity Xs in the ultraviolet region and supplies this to the MED value calculation / integrator circuit 514. The calculator / integrator circuit 514 uses the supplied light intensity Xs in the ultraviolet region and the standard MED value Xsm stored in the MED value memory 506 to calculate the integration ME by the following equation (5).
Calculates a D multiple value.

Cumulative MED multiple value = ΣXs / Xsm (5) Here, ΣXs is a value obtained by sequentially adding the light intensity Xs in the ultraviolet region calculated every predetermined time (0.5 seconds). As is clear from the above equation (5), the calculated integrated MED multiple value indicates how many times the standard MED value (90,000 J / m ² ) of ultraviolet light has been exposed so far. is there. The standard MED value (90,000 J / m ² ) used in the above formula (5) may be an appropriate value depending on the type of skin of the user.

The integrated MED multiple values calculated by the calculator / integrator circuit 514 are integrated.
The data is updated in the MED multiple data register 527 and is also supplied to the comparator circuit 513 to be compared with _a predetermined value k _a . When it is detected for the first time that the calculated integrated MED multiple value becomes equal to or greater than this predetermined value k _a , the alarm control circuit 52
The buzzer 70 is operated via 3 and an alarm sound is emitted.
Thereby, it is possible to notify the user that the irradiation dose of light in the ultraviolet region has reached the dangerous region.

Then, the integrated time counter value stored in the integrated time counter circuit 504 is incremented by 1, and it is determined whether or not there is a measurement end operation (pressing the switch SW2 for 1 second or more).
If it is O, the integrated time of the light intensity in the ultraviolet region is further calculated by the predetermined time (12
Time) is determined. If this specified time is not exceeded, the routine is repeatedly executed and the accumulated MED
Continues the calculation of multiple values.

Accumulated MED Accumulated ME stored and updated in the multiple data register 527
The D multiple value is displayed on the liquid crystal display unit 60 by executing the main routine as described above. At this time, the integrated MED multiple value may be digitally displayed on the digital numeral display portion 4a, or may be displayed in multiple stages as a bar graph on the bar graph display portion 4b.

There was a measurement end operation or a predetermined time (12 hours)
When the time elapses, the mode designated by the switch SW1 is returned to the watch mode, the control signal P1 output from the power saving circuit 503 is stopped, the power of the input circuit 40 is turned off, and the integrated time counter of the integrated time counter circuit 504 is further turned off. The value is reset to 0 and the routine ends.

SPF Mode 6 When the SPF mode is selected by pressing the first switch SW1 a predetermined number of times, the routine shown in FIG. 22 is repeatedly executed at the predetermined cycle (0.5 seconds). This SPF mode is
From the measured light intensity Xs in the ultraviolet region, when the same intensity of light in the ultraviolet region is continuously exposed for a predetermined time (for example, 1 hour), the sunburn is generated despite the exposure dose (see the above-mentioned “ In order to prevent the occurrence of slight erythema "), this indicates the value of cosmetics having an SPF value.

First, when the SPF mode is selected by pressing the first switch SW1, the power saving circuit 503 turns on the power of the input circuit unit 40. Then, similarly to the case of the intensity mode, the intensity calculation circuit 501 calculates the light intensity Xs in the ultraviolet region, and calculates this SPF.
It is supplied to the value calculation circuit 507. The SPF value calculation circuit 507 calculates the SPF value by the following equation (6) using the supplied light intensity Xs in the ultraviolet region and the standard MED value Xsm stored in the MED value memory 506.

SPF value = (Xs × Tm) / Xsm (6) Here, Tm is the above-mentioned predetermined time, and is set to, for example, 3600 seconds (1 hour). As is clear from the above equation (6), the calculated SPF value must be exposed to an irradiation dose that is many times the standard MED value (90,000 J / m ² ) when the light intensity Xs in the ultraviolet region is exposed for another hour. Is displayed. In addition,
As the standard MED value (90,000 J / m ² ) used in the above formula (6), an appropriate value may be used depending on the skin type of the user.

The SPF value calculated by the SPF value calculation circuit 507 is stored and updated in the SPF value data register 524. Then, the measurement time counter value stored in the intensity measurement time counter circuit 501 is set to 1
It is determined whether or not the measurement time of the light intensity in the ultraviolet region exceeds a predetermined time (3 minutes) from the incremented measurement time count value. When this predetermined time is not exceeded, the routine is repeatedly executed, and the calculation of the light intensity Xs in the ultraviolet region and the SPF value is continued. If another mode is selected in the main routine before the predetermined time is reached, the power is turned off, the measurement time counter is reset to zero, and the measurement is completed.

The SPF value stored and updated in the SPF value data register 524 is stored in the liquid crystal display unit 60 by executing the main routine as described above.
Is displayed in. At this time, the SPF value is displayed on the digital number display 4
It may be digitally displayed in a or may be displayed in multiple stages in a bar graph on the bar graph display unit 4b.

After a lapse of a predetermined time (3 minutes), the mode designated by the switch SW1 is returned to the watch mode, the control signal P1 output from the power saving circuit 503 is stopped, the power of the input circuit 40 is turned off, and the strength measurement is performed. The measurement time counter value of the time counter circuit 502 is reset to 0 and the routine is finished.

Total SPF mode Total SPF mode by pressing the first switch SW1 a predetermined number of times
When M7 is selected, the M7 routine of FIG.
It is repeatedly executed in 5 seconds). This routine is based on the integrated value of the light intensity in the ultraviolet region, that is, from the total irradiation dose of light in the ultraviolet region, in order to prevent sunburn despite exposure to this irradiation dose, the SPF value can be any value. It indicates whether to use the cosmetics that the user has. For example, it is convenient when deciding the cosmetics to be used today from the irradiation dose of ultraviolet rays yesterday.

When the cumulative SPF mode is selected by pressing the first switch SW1, it is first determined whether the cumulative time counter value of the cumulative time counter circuit 504 is 0 or not. Immediately after this mode is selected, this count value is 0 (the determination result is affirmative), so the power saving circuit 503 turns on the power of the input circuit unit 40, and the stored value of the integrated SPF value data register 525 is set to 0. Reset to. If such a process is executed once, the integrated time counter value becomes larger than 0, and therefore it is not executed again until the ending operation by the switch SW2 or the routine is ended by the automatic end. Therefore, in the main routine, even if another mode (for example, a clock mode or an intensity mode) is executed during execution of the routine, the integration routine continues to be executed.

Then, as in the case of the intensity mode, the intensity calculation circuit 501
Calculates the light intensity Xs in the ultraviolet region and supplies this to the SPF value calculation / integrator circuit 512. The calculator / accumulator circuit 512 uses the supplied light intensity Xs in the ultraviolet region and the standard MED value Xsm stored in the MED value memory 506 to calculate the sum SP according to the following equation (7).
Calculate the F value.

Accumulated SPF value = ΣXs / Xsm (7) Here, ΣXs is a value obtained by sequentially adding the light intensity Xs in the ultraviolet region calculated every predetermined time (0.5 seconds). The standard MED value (90,000 J / m ² ) used in the above formula (7) may also be an appropriate value depending on the type of skin of the user.

The integrated SPF value calculated by the calculator / integrator circuit 512 is the integrated SPF.
It is stored in the value data register 525 and updated, and is also supplied to the comparator circuit 511 to be compared with the predetermined value k _b . Then, when it is detected for the first time that the calculated integrated SPF value becomes equal to or _larger than the predetermined value k _b , the buzzer 70 is operated via the alarm control circuit 523, and an alarm sound is emitted. This makes it possible to notify the user that the irradiation dose in the ultraviolet region up to now has reached the irradiation dose that requires the use of cosmetics having a higher SPF value.

Then, the integrated time counter value stored in the integrated time counter circuit 504 is incremented by 1 to determine whether or not there is a measurement end operation (press the switch SW2 for 1 second or more), and N
If it is O, the integrated time of the light intensity in the ultraviolet region is further calculated by the predetermined time (12
Time) is determined. If the specified time is not exceeded, the routine is repeatedly executed to calculate the total SPF.
Continue calculating the value.

Accumulated SPF value data register 525
The value is displayed on the liquid crystal display unit 60 by executing the main routine as described above. At this time, the integrated SPF value may be digitally displayed on the digital numeral display unit 4a or may be displayed in multiple stages as a bar graph on the bar graph display unit 4b.

There is a measurement end operation, or the mode designated by the switch SW1 is returned to the watch mode, the control signal P1 output from the power saving circuit 503 is stopped, the power of the input circuit 40 is turned off, and the integration time counter circuit The integrated time counter value of 504 is reset to 0 and the routine is finished.

In the above-mentioned embodiment, the ultraviolet measuring device is described as a wristwatch type, but it may be a pendant type or a hair band type.

Also, the standard MED value necessary for calculating the bar graph display of the ultraviolet intensity and the MED multiple is preset in the MED value memory 506, but the first and second switch SW
A desired value may be input by using 1 and SW2. The input of the MED value at this time can be performed by a method similar to the method described in the time adjustment described above.

(Effects of the Invention) The ultraviolet measuring device of the present invention comprises a measuring-side light receiver including a light-receiving element having spectral sensitivity in the ultraviolet region, and a light-receiving surface of the light-receiving element having the same spectral sensitivity as the light-receiving element in the ultraviolet region. On the front side of the reference side light receiving device in which the first optical filter for blocking only the light is arranged, and the interference filter and the light receiving face of the interference filter arranged on the light receiving faces of the measurement side light receiving device and the reference side light receiving device. A light receiving part provided with a composite filter composed of a quartz diffuser plate or a quartz concave lens arranged; Calculates the light intensity in the ultraviolet region and the integrated value of the light intensity according to the difference between the outputs of the measurement side light receiver and the reference side light receiver. An arithmetic circuit unit; and a display unit for displaying an arithmetic value obtained from the arithmetic circuit unit are provided, and only the light in the ultraviolet region and the light in the sub-transmission band are introduced into both light receivers, In contrast, the difference between the outputs of both receivers Since the sensitivity to light in the sub-transmission band does not appear, the measurement accuracy is greatly improved as compared with the conventional case.

For example, the accuracy of visible light compensation is as follows.

First, the output S _{1 of the} amplifier 401 is 100 + 150 = 250 W / m ^{2 because} it is based on the light in the ultraviolet region and the light in the sub-transmission band. Further, the output S _{2 of the} amplifier 402 is 150 W / m ^{2 because} it is based only on the light in the sub-transmission band. Therefore, from the intensity calculation circuit 501 of the calculation circuit 50, an output corresponding to S ₁ −S ₂ = 250−150 = 100 W / m ² is obtained based on only the light in the ultraviolet region.

Here, assuming that the light detection accuracy of each of the light receivers 10 and 20 is ± 1% of full scale, the error is ± 1% of 6500 W / m ^{2 in} the conventional case, but in the case of this device, it is in the ultraviolet range. Since the visible light component in the region other than is 150 W / m ² , the measurement error of each of the light receivers 10 and 20 is ± (250 × 0.01) = ± 2.5 W / m ² .

Therefore, the visible light compensation accuracy in this device is S ₁ −
S ₂ = (250 ± 2.5)-(150 ± 2.5) = 100 ± 5 W / m ² .
That is, the measurement error of this device is ± 5%.

Therefore, as compared with the above-mentioned conventional device, the visible light compensation accuracy is 130 / 5≈26, that is, about 26 times, when detecting the ultraviolet region of 100 W / m ² , which is extremely high accuracy.

Further, in this device, since the composite filter as described above is arranged on the light receiving surface, the relative spectral sensitivity of the device becomes trapezoidal rather than mountain-shaped in the ultraviolet region as shown in FIG. Therefore, the integrated value of the intensity with respect to the wavelength is not as shown in FIG. 25, but is a value that covers all the shaded portion T in FIG.

In addition, in this device, not only the intensity of ultraviolet light and its integrated value are displayed as digital numbers, but various calculations are performed using the standard MED value stored in the calculation circuit unit 50 as the measured value. Since the calculation result is displayed in a bar graph in multiple stages, it is possible for the user to judge the degree of sunburn at a glance, which is extremely useful for the user.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is an enlarged side view, FIG. 4 is a plan view showing the back surface, and FIG. FIG. 6 is a circuit diagram of the whole of the device of the invention, FIG. 6 is a circuit diagram of the arithmetic circuit section, FIG. 7 is a graph showing the spectral sensitivity of the light receiving element, and FIG. 8 is a spectral transmission of the first optical filter. FIG. 9 is a graph showing the spectral transmittance of the interference filter, FIG. 10 is a graph showing the profile of the light transmitted through the composite filter, and FIG. 11 is the relative spectral sensitivity of the reference side light receiver. , FIG. 12 is a graph showing the relative spectral sensitivity of the measurement-side photoreceiver, FIG. 13 is a graph showing the difference between the relative spectral sensitivity of the measurement-side photoreceiver and the reference-side photoreceiver, and FIG. Fig. Is an explanatory view showing the operation procedure for mode switching, and Fig. 15 is a view for explaining the control procedure of the overall main routine. Flowchart, FIG. 16,
Explanatory drawing showing the time adjustment processing procedure, FIG. 17 is a flow chart showing the intensity mode routine, FIG. 18 is an explanatory view showing the processing procedure of the integration mode, and FIG. 19 is a flow chart showing the integration mode routine. Fig. 20 is a flow chart showing the routine of the MED multiple mode, and Fig. 21 is
FIG. 22 is a flowchart showing a routine of the integrated MED multiple mode, FIG. 22 is a flowchart showing a routine of the SPF mode, FIG. 23 is a flowchart showing a routine of the integrated SPF mode, and FIG. 24 is a spectrum distribution curve of sunlight. FIG. 25 is a graph showing S (λ), and FIG. 25 is a graph showing ultraviolet ray intensity (T ′) in sunlight detected by the measuring device. 1 ... container, 1a ... top of container, 1b ... side wall of container, 1c
…… Sloping surface, 1d …… Back side of container, 2 …… Band, 3 ……
Receiver, 4 …… Display window, 4a …… Digital number display, 4b
…… Bar graph (multi-level intensity display), 4c, 4d …… Measurement mode display, 5 …… Mercury battery, SW1, SW2 …… Switch, 7 …… Back cover, 8 …… Bis, 10 …… Measurement Side receiver, 10
1 …… Hui diode, 20 …… Reference side photoreceiver, 201 …… Photodiode, 202 …… First optical filter, 3A …… Light receiving circuit section, 30 …… Composite filter, 31 …… Interference filter,
32 ... Quartz diffuser, 40 ... Input circuit, 401, 402 ... Amplifier, 403 ... AD converter, 404, 405 ... Feedback variable resistor, 406 ... Switch circuit, 50 ... Arithmetic circuit section, 501 ...
Strength calculation circuit, 502 ... Strength measurement time counter circuit, 503
...... Power saving circuit, 504 …… Integrated time counter circuit, 505 ……
Accumulator circuit, 506 ... MED value memory, 507 ... SPF value calculation circuit, 508 ... MED multiple calculation circuit, 509 ... Bar graph intensity calculation / comparator circuit, 510 ... Bar graph integration / calculation comparator circuit , 511 …… Comparator circuit, 512 …… SPF value calculation / integrator circuit, 513 …… Comparator circuit, 514 …… MED value calculation / integrator circuit, 515 …… Time adjustment circuit, 516 …… Clock circuit, 517
...... Stopwatch circuit, 518 …… Mode switching circuit, 5
18a ... Switch element, 519 ... Intensity data register, 52
0 …… Bar graph intensity data register, 521 …… Bar graph integrated data register, 522 …… Integrated data register, 5
23 …… Alarm control circuit, 524 …… SPF value data register, 525 …… Integrated SPF value data register, 526 …… MED multiple data register, 527 …… Integrated MED multiple data register,
528 …… Clock data register, 529 …… Low battery detection circuit,
530 …… LCD driver circuit, 60 …… LCD display, 70 ……
buzzer.

Claims (1)

[Scope of utility model registration request] 1. A measuring-side light receiver comprising a light-receiving element having a spectral sensitivity in the ultraviolet range, and a light-receiving surface of a light-receiving element having the same spectral sensitivity as the light-receiving element for blocking only light in the ultraviolet range.
A reference-side light receiver formed by arranging the optical filter of, and arranged on the light-receiving surfaces of the measurement-side light-receiver and the reference-side light receiver,
A light-receiving unit including an interference filter and a composite filter formed of a quartz diffuser plate or a quartz concave lens arranged in front of the light-receiving surface of the interference filter; ultraviolet light depending on a difference between outputs of the measurement-side light receiver and the reference-side light receiver. An ultraviolet ray measuring apparatus comprising: an arithmetic circuit section for calculating the light intensity of the region and an integrated value of the light intensity; and a display means for displaying the arithmetic value obtained from the arithmetic circuit section.