JP6270500B2 - Light quantity measuring sensor and light quantity measuring device - Google Patents

Description

  The present invention relates to a light quantity measuring sensor and a light quantity measuring device in which a cover part, a filter part, and a photoelectric conversion part are arranged in this order along the incident direction of light to be measured.

  As this type of light quantity measuring sensor and light quantity measuring device, a light receiving device for various photometric devices such as an illuminometer is disclosed in Patent Document 1 below. Specifically, for example, in the light receiving device disclosed in Example 1 (see FIG. 14 of the same document), a cover plate, a diffusion plate, a filter (an infrared absorption filter and an interference filter), and a photoelectric conversion element are measurement targets. It arrange | positions in this order along the advancing direction of light (henceforth "measurement object light"), and is comprised so that measurement of the irradiation amount of measurement object light is possible. Further, in the light receiving device disclosed as a comparative example (see FIG. 15 of the same document), the globe, the filter (the first glass filter and the second glass filter), and the photoelectric conversion element are arranged along the traveling direction of the measurement target light. It arrange | positions in order and is comprised so that measurement of the irradiation amount of measurement object light is possible.

  In this case, the cover plate and the globe in both the above-described light receiving devices (hereinafter, the cover plate and the globe in both the light receiving devices are collectively referred to as a “cover portion”) are formed in a hemispherical shape from a milky white acrylic resin material. The protruding end portion is disposed so as to protrude toward the front side in the incident direction of the measurement target light. Thereby, in both light receiving devices, for example, the light receiving device (the cover portion protrudes) is arranged so that the flat cover portion is flush with the light receiving surface side of the device housing. Unlike a non-light receiving device), even when the measurement target light is incident on the light receiving device at a slight angle, the measurement target light is guided to the photoelectric conversion element by the hemispherical cover and received. Can be measured accurately.

  Further, both the light receiving devices described above are provided with an annular inclined wall (wall-shaped light-shielding convex portion) so as to surround the cover portion. In this case, in both light receiving devices, the protruding length of the annular inclined wall from one surface of the device housing on the light receiving surface side is shorter than the protruding length of the cover portion (the annular inclined wall is lower than the cover portion). It is comprised so that when the light receiving device is viewed from the side, the protruding end of the cover portion appears to protrude from the annular inclined wall. As a result, both light receiving devices can receive the measurement target light from the side of the device to some extent, and the amount of light received by the photoelectric conversion element decreases as the measurement target light is irradiated obliquely. Thus, the irradiation amount for each incident angle of the measurement target light with respect to the apparatus is adjusted.

JP 2011-220769 A (page 7-25, FIG. 1-18)

  However, the conventional light receiving device has the following problems to be solved. That is, in the conventional light receiving device, the protruding length of the cover portion from one surface of the device housing on the light receiving surface side is longer than the protruding length of the annular inclined wall (the cover portion is higher than the annular inclined wall). And the projecting end of the cover part projects from the annular inclined wall toward the front side in the incident direction of the measurement target light. For this reason, in the conventional light receiving device, for example, when the device is accidentally dropped, the protruding end of the cover portion comes into contact with the ground surface, the floor surface, etc., which causes the cover portion to be damaged or deformed. May occur.

  In this case, in a state where the cover portion is scratched, the amount of light to be measured is diffused in an unintended direction due to the presence of the scratch and the amount of light received by the photoelectric conversion element is different from the original received light amount. It becomes a state to do. Further, when the cover portion is deformed, the distance between the filter or the photoelectric conversion element and the cover portion is different from the design value, and the amount of light received by the photoelectric conversion element is the original light reception. It becomes a state different from the amount. As described above, in the conventional light receiving device in which the protruding end of the cover portion protrudes, the cover portion is easily damaged or deformed, and it is difficult to accurately measure the irradiation amount of the measurement target light due to this. There is a problem that sometimes.

  The present invention has been made in view of such problems, and a main object of the present invention is to provide a light quantity measuring sensor and a light quantity measuring apparatus that can suitably avoid damage and deformation of the cover portion.

In order to achieve the above object, the light quantity measuring sensor according to claim 1, wherein the cover portion, the filter portion, and the photoelectric conversion portion are arranged in this order in the sensor casing along the incident direction of the light to be measured, and The measurement target that is projected from the light receiving surface side of the sensor housing toward the front side in the incident direction and that is received by the photoelectric conversion unit through the cover and the filter unit A light quantity measuring sensor configured to be able to output a sensor signal corresponding to the amount of received light, and intersecting at an angle exceeding a predetermined angle with respect to a vertical incident direction of the measurement target light with respect to the photoelectric conversion unit an annular shielding portion formed on the periphery of the regulating capable the cover portion incidence of light to the cover portion from the direction of the sensor housing, the front side in the vertical direction of incidence Includes a protrusion protruding from selfish said one surface, wherein the annular shielding portion, the second first projecting length to projecting end of the annular light-shielding portion from the one side to the projecting end of the cover portion from the one side The projecting portion has a third projecting length from the one surface to the projecting end of the projecting portion that is longer than the second projecting length, and the cover portion. When the light quantity measurement sensor is placed on the horizontal plane so that the protruding portion is in contact with the horizontal plane in a state in which the cover is faced downward, the cover portion is defined as a protruding length that is not in contact with the horizontal plane , The light-transmitting material capable of transmitting the measurement target light is formed on the protruding end portion of the annular light shielding portion .

  The light quantity measuring sensor according to claim 2 is the light quantity measuring sensor according to claim 1, wherein the protruding portion is at least two convex portions formed at positions facing each other across the cover portion on the one surface. It is configured with.

  The light quantity measuring sensor according to claim 3 is the light quantity measuring sensor according to claim 1, wherein the protrusion includes at least three convex portions scattered around the cover portion on the one surface. Configured.

  The light quantity measuring sensor according to claim 4 is the light quantity measuring sensor according to claim 1, wherein the projecting portion includes an annular convex portion formed on the one surface so as to surround the cover portion. Yes.

According to a fifth aspect of the present invention, there is provided a light quantity measurement sensor according to any one of the first to fourth aspects, and the sensor signal output from the light quantity measurement sensor. And a measuring unit for measuring the amount of light.

Further, in the light quantity measuring device according to claim 6 , the cover portion, the filter portion, and the photoelectric conversion portion are arranged in this order along the incident direction of the measurement target light in this order, and on the near side of the incident direction. The cover portion is protruded from one surface of the apparatus housing toward the light receiving surface side, and the light is received by the photoelectric conversion portion through the cover portion and the filter portion and received by the photoelectric conversion portion. A sensor unit configured to be able to output a sensor signal, and a measurement unit configured to be able to measure the light amount of the measurement target light based on the sensor signal output from the sensor unit and housed in the apparatus housing a light amount measuring apparatus equipped with a preparative, light to the cover portion in the direction intersecting at an angle greater than a predefined angle relative to the vertical incident direction of the measurement target light on the photoelectric conversion portion An annular shielding portion formed around the regulation capable the cover portion of the incident, the device housing is provided with a protrusion protruding from the one surface toward the front side in the vertical incident direction, the annular shielding The portion is formed such that a first protrusion length from the one surface to the protruding end portion of the annular light shielding portion is shorter than a second protrusion length from the one surface to the protruding end portion of the cover portion. parts, the third projecting length to projecting end of the projecting portion from the one side, the longer than the second protrusion length, and so that the protrusion is in contact with the horizontal surface while the cover portion downwardly When the light quantity measuring device is placed on the horizontal plane, the cover portion is defined to have a protruding length that is not in contact with the horizontal plane, and the light transmitting material is capable of transmitting the measurement target light. It is formed on the projecting end of the annular shielding portion To have.

Further, the light amount measuring apparatus according to claim 7, wherein, in the light amount measuring apparatus according to claim 6, wherein said protruding portion comprises at least two protrusions are formed at positions facing each other across the cover portion at the one surface Configured.

In addition, the light amount measuring device according to claim 8 is the light amount measuring device according to claim 6 , wherein the protruding portion includes at least three convex portions scattered around the cover portion on the one surface. Has been.

A light quantity measuring device according to a ninth aspect is the light quantity measuring device according to the sixth aspect , wherein the projecting portion includes an annular convex portion formed on the one surface so as to surround the cover portion.

In the light quantity measuring sensor according to claim 1 and the light quantity measuring device according to claim 6, when the light quantity measuring sensor is placed on the horizontal plane so that the protruding portion is in contact with the horizontal plane with the cover portion facing downward. The protruding portion is formed with a protruding length in which the cover portion is not in contact with the horizontal plane. According to a fifth aspect of the present invention, the light quantity measuring apparatus includes the light quantity measuring sensor and a measuring unit that measures the light quantity of the measurement target light based on the sensor signal output from the light quantity measuring sensor. Therefore, according the light amount measurement sensor according to claim 1 Symbol placement, and the light amount measurement device according to claim 5 and 6, wherein, even when dropped accidentally quantity measurement sensor (light quantity measurement unit), the projecting portion is horizontal Since the cover part is in contact with the (horizontal or floor) surface and is not in contact with the horizontal plane, a gap is generated between the cover part and the horizontal plane, and the cover part is damaged or deformed. Can be suitably avoided. As a result, the optical characteristics of the cover part can be maintained in the initial state. As a result, the measurement target light is suitably guided to the filter part and the photoelectric conversion part by the cover part, and the state in which the light quantity is accurately measured is maintained. be able to.
According to the light quantity measuring sensor according to claim 1 and the light quantity measuring device according to claims 5 and 6, the first protrusion length of the annular light shielding portion is shorter than the second protrusion length of the cover portion, In addition, since the third protrusion length of the protrusion portion is formed to be longer than the second protrusion length of the cover portion, the protrusion portion intersects the vertical incident direction while avoiding damage and deformation of the cover portion. As a result of being able to suitably limit the incident amount of the measurement target light from the direction to the cover portion by the annular light shielding portion, it is possible to suitably execute the measurement process standardized by JIS or the like.
Further, according to the light quantity measuring sensor according to claim 1 and the light quantity measuring device according to claims 5 and 6, the protruding portion is formed on the protruding end portion of the annular light shielding portion by the light transmissive material capable of transmitting the measurement target light. With this, the sensor for measuring light quantity (light quantity measuring device) is sufficiently miniaturized, and the cover part is prevented from being damaged or deformed by the protruding part. The amount of incident light can be suitably limited by the annular light shielding portion.

Further, according to the light quantity measuring sensor according to claim 2 and the light quantity measuring device according to claim 7 , the light receiving surface side includes at least two convex portions formed at positions facing each other across the cover portion. For example, even if the light quantity measuring sensor (light quantity measuring device) falls in a tilted state, any one of the convex parts constituting the protruding part is on the horizontal plane (ground or floor). As a result of being able to reliably avoid the situation where the cover part first contacts and touches the horizontal surface, it is possible to suitably avoid the situation where the cover part is damaged or deformed, and thereby the light quantity can be accurately measured. Can be reliably maintained.

Further, according to the light quantity measuring sensor according to claim 3 and the light quantity measuring device according to claim 8 , the light quantity measuring device according to claim 8 is provided with at least three convex portions scattered around the cover portion on one surface of the light receiving surface side. For example, even if the sensor for measuring light quantity (light quantity measuring device) falls in a tilted state, any one of the convex parts constituting the protruding part is first placed on the horizontal plane (the ground or floor). As a result of being able to reliably avoid the situation in which the cover part comes into contact with the horizontal plane, the situation in which the cover part is damaged or deformed can be suitably avoided, and the state in which the amount of light can be measured accurately is ensured. Can be maintained.

Further, according to the light quantity measuring sensor according to claim 4 and the light quantity measuring device according to claim 9, the protruding portion is configured by including the annular convex portion formed on one surface of the light receiving surface side so as to surround the cover portion. Thus, for example, even if the sensor for measuring light quantity (light quantity measuring device) falls in a tilted state, any part of the annular convex part constituting the protruding part first comes into contact with the horizontal plane (the ground or the floor). As a result of being able to reliably avoid the situation where the cover part comes into contact with the horizontal surface, it is possible to suitably avoid the situation where the cover part is damaged or deformed, thereby ensuring a state in which the amount of light can be accurately measured. Can be maintained.

1 is a front view of a light quantity measuring device 1. FIG. 2 is a front view of the light quantity measuring device 1 in a state in which the measuring device main body 2 and the light quantity measuring sensor 3 are separated and connected to each other by a connection cable 4. FIG. 2 is a cross-sectional view illustrating a configuration of a light quantity measurement sensor 3 in the light quantity measurement device 1. FIG. FIG. 3 is a cross-sectional view of a state where the light quantity measurement device 1 (light quantity measurement sensor 3) is placed on the horizontal plane X with the globe 21 facing downward. It is a front view of the sensor 3a for light quantity measurement in the light quantity measuring apparatus 1A which concerns on other embodiment. It is a front view of the sensor 3b for light quantity measurement in the light quantity measuring apparatus 1B which concerns on other embodiment. It is a front view of the sensor 3c for light quantity measurement in 1C of light quantity measuring apparatuses which concern on other embodiment. It is sectional drawing which shows the structure of the sensor 3c for light quantity measurement in the light quantity measuring apparatus 1C. FIG. 3 is a cross-sectional view of a state in which the light quantity measurement device 1C (light quantity measurement sensor 3c) is placed on the horizontal plane X with the globe 21 facing downward. It is a front view of light quantity measuring device 1D concerning other embodiments. It is sectional drawing which shows the structure of light quantity measuring apparatus 1D. It is sectional drawing of the state which mounted the light quantity measuring device 1D on the horizontal surface X with the globe 21 facing down.

  Hereinafter, embodiments of a light quantity measuring sensor and a light quantity measuring device will be described with reference to the accompanying drawings.

  The light quantity measuring apparatus 1 shown in FIG. 1 is an “illuminance meter” which is an example of a “light quantity measuring apparatus”, and is an illuminance measurement process standardized in “JIS C 1609-1” and “JIS C 1609-2”. Is configured to run. The light quantity measuring apparatus 1 includes a measuring apparatus main body 2 and a light quantity measuring sensor 3, and as shown in the figure, a usage configuration in which measurement processing is performed in a state where the measuring apparatus main body 2 and the light quantity measuring sensor 3 are integrated. As shown in FIG. 2, a usage mode in which measurement processing is performed in a state where the measurement device body 2 and the light amount measurement sensor 3 are connected to each other by the connection cable 4 in a state where the light amount measurement sensor 3 is disconnected from the measurement device body 2 Any one of the above can be arbitrarily selected by the user.

  As shown in FIGS. 1 and 2, the measuring device main body 2 includes a measuring unit (measuring circuit) that measures the irradiation amount (illuminance) of light to be measured based on a sensor signal output from the light quantity measuring sensor 3 as described later. : Not shown) is provided. Further, the device housing 10 displays an operation unit 11 capable of switch operations such as a measurement range changing operation, a hold operation for holding a display of a measurement result, and an adjustment operation, and a measurement result by the measurement unit is displayed as a numerical value. The display unit 12 is disposed.

  The light quantity measuring sensor 3 is an example of a “light quantity measuring sensor”, and as shown in FIG. 3, the glove 21, the filter unit 22, and the photoelectric conversion unit 23 are incident directions of the measurement target light (arrow L 0 in the figure). The sensor signal corresponding to the amount of light to be measured that is transmitted through the globe 21 and the filter unit 22 and received by the photoelectric conversion unit 23. It can be output to the measurement unit of the main body 2.

  The globe 21 is an example of a “cover part”, and functions as a “protective member” that prevents the filter part 22 from being scratched or attached with dust, and the filter part 22 ( It is configured to have a function as an “incident light diffusing unit” for guiding to the photoelectric conversion unit 23). Specifically, as an example, the globe 21 is formed in a hemispherical shape with a light-transmissive milky white resin material (for example, acrylic resin), and is opened on one surface 24a of the sensor housing 20 on the light receiving surface side. By being fitted into the opening 24b from the inside of the sensor housing 20, it is fixed to the sensor housing 20 in a state of protruding from the one surface 24a toward the near side in the incident direction of the measurement target light.

  The filter unit 22 is an example of a “filter unit”, and is fixed to the sensor housing 20 so as to be positioned between the globe 21 and the photoelectric conversion unit 23, and the light quantity measuring device 1 (light quantity measurement sensor 3). ) Transmits light having a predetermined wavelength, and restricts transmission of light having other wavelengths. The photoelectric conversion unit 23 is an example of a “photoelectric conversion unit”, and is fixed to the sensor housing 20 so as to be able to receive the measurement target light transmitted through the globe 21 and the filter unit 22 and is a sensor signal corresponding to the amount of light received. Is output.

  In order to facilitate understanding of the configuration of the light quantity measurement device 1 (light quantity measurement sensor 3), a configuration having the globe 21, the filter unit 22, and the photoelectric conversion unit 23 will be described as an example. The configuration of the “measurement device (light quantity measurement sensor)” is not limited to this, and various optical functional layers (for example, between the globe 21 and the filter unit 22 and between the filter unit 22 and the photoelectric conversion unit 23). , "Optical diffusion layer") can also be provided. Further, the filter unit 22 is not limited to a single layer structure, and a multilayer structure in which a plurality of types of filter layers are stacked may be employed.

  In this case, the sensor housing 20 is an example of a “sensor housing”, and is formed in a box shape as a whole, and the opening 24b (the measurement object in the box body) into which the globe 21 can be fitted as described above. A round hole for introducing light) is opened on one surface 24a. As shown in FIGS. 1 to 3, the sensor housing 20 faces the light shielding wall 25 formed around the globe 21 on the one surface 24 a and the near side in the vertical incident direction of the measurement target light with respect to the photoelectric conversion unit 23. And a protective protrusion 26 protruding from one surface 24a.

  The light shielding wall 25 is an example of an “annular light shielding portion”, and intersects at an angle exceeding a predetermined angle with respect to the vertical incident direction of the measurement target light with respect to the light amount measuring device 1 (the light amount measuring sensor 3). It is comprised so that incidence of the light to the globe 21 from can be controlled. Specifically, in the light quantity measuring device 1 (light quantity measuring sensor 3) of this example, as shown in FIG. 3, the measurement target light (light incident as indicated by the arrow L0) incident in the vertical incident direction is a globe. The light to be measured (light incident as shown by arrow L1) that is irradiated from almost the entire area of the hemispherical portion 21 and incident at an intersection angle θ of 80 ° with respect to the vertical incident direction is incident on the hemispherical portion of the globe 21. The height H25 from the one surface 24a to the protruding end of the light shielding wall 25 (an example of “first protruding length”) and the distance of the light shielding wall 25 from the globe 21 (light shielding) so that the range indicated by the arrow A is irradiated. The diameter of the wall 25) is defined and formed.

  The protective protrusion 26 is an example of a “protrusion”, and as shown in FIGS. 1 and 2, two protrusions formed at positions facing each other across the globe 21 on one surface 24 a of the sensor housing 20. It is configured with. In both figures, the projecting end portions (projecting end surfaces) of both projecting portions constituting the protective projecting portion 26 are shown with mesh lines. As shown in FIG. 4, the protective protruding portion 26 has the light amount measuring sensor 3 so that the protective protruding portion 26 is in contact with the horizontal plane X (for example, the ground surface, floor surface, etc.) with the globe 21 facing downward. When placed on the horizontal plane X, the globe 21 is formed in a protruding length that is not in contact with the horizontal plane X.

  In this case, as shown in FIG. 3, in the light quantity measurement device 1 (light quantity measurement sensor 3) of this example, the height H25 of the light shielding wall 25 is the height H21 from the one surface 24a to the protruding end of the globe 21 (" The height H26 (an example of the “third projecting length”) from the one surface 24a to the projecting end of the protective projecting part 26 is lower than the “second projecting length” (an example of the “second projecting length”). The sensor housing 20 is formed so as to be higher than the height H21 of 21 (the protrusion length is long). The protective protrusion 26 is not simply formed higher than the height H 21 of the globe 21, but the measurement target light incident on the light quantity measuring sensor 3 with the arrow L 1 is indicated by the arrow A in the globe 21. The height (protrusion length) and the formation position (distance from the globe 21) that do not hinder the irradiation of the range, that is, the height and formation position that do not impede the function of the light shielding wall 25 are defined. .

  When measuring the illuminance by the light amount measuring device 1, the light amount measuring sensor 3 is directly connected to the measuring device main body 2 as shown in FIG. 1, or the light amount is measured via the connection cable 4 as shown in FIG. In a state where the sensor 3 is connected to the measuring device main body 2, the operation unit 11 of the measuring device main body 2 is operated to select a desired measurement range. Next, the light quantity measuring sensor 3 is positioned on the measurement target portion with the globe 21 facing upward. At this time, the measurement target light incident in the vertical incident direction or the measurement target light incident obliquely from the direction intersecting the vertical incident direction is irradiated on the globe 21, and the filter unit is configured to diffuse these lights by the globe 21. It is guided toward 22.

  Further, the light guided to the filter unit 22 is transmitted through the filter unit 22 and received by the photoelectric conversion unit 23. At this time, the photoelectric conversion unit 23 outputs a sensor signal corresponding to the amount of light to be measured, and the measurement unit in the measurement apparatus main body 2 receives the light amount based on the sensor signal output from the photoelectric conversion unit 23. The irradiation amount (illuminance) of the measurement target light with respect to the measurement sensor 3 is calculated and displayed on the display unit 12 as a numerical value or a graph. In addition, about the measurement process of said irradiation amount (illuminance), it is the process which satisfy | fills the measurement standard standardized as mentioned above, and since detailed content is well-known, detailed description is abbreviate | omitted.

  On the other hand, the light quantity measuring device 1 (light quantity measuring sensor) is mistakenly set when installed on the measurement target part, when removed from the measurement target part, or when the user is moving with the light quantity measuring apparatus 1. 3) may be dropped. In such a case, in the conventional light receiving device, as described above, the protruding end of the cover portion that protrudes from the housing of the device comes into contact with the ground surface, the floor surface, etc., and the cover portion is scratched or deformed to cause accurate irradiation. It may be difficult to measure the amount.

  On the other hand, in the light quantity measuring device 1 (light quantity measuring sensor 3) of this example, even if it is accidentally dropped, as shown in FIG. The protruding end (protruding end surface) is in contact with the horizontal plane X (the ground or floor surface), the protruding end of the globe 21 is in non-contact with the horizontal plane X, and the gap S is between the globe 21 and the horizontal plane X. Will occur. Thereby, the situation where the glove 21 is damaged or deformed is preferably avoided.

  Moreover, in the light quantity measuring device 1 (light quantity measuring sensor 3) of this example, not only when it is accidentally dropped as described above, but also, for example, a state where the glove 21 is placed on the measurement target site with the glove 21 facing upward Even when a notebook or binder is accidentally dropped on the light quantity measurement device 1 (light quantity measurement sensor 3) with the globe 21 facing upward when not in use, for protection The fallen object comes into contact with the projecting ends (projection end surfaces) of both convex portions constituting the projecting portion 26, and the projecting end of the globe 21 is in a non-contact state with respect to the fallen object. A gap S is generated between them. Thereby, the situation where the glove 21 is damaged or deformed is preferably avoided.

  As described above, in the light quantity measurement sensor 3 and the light quantity measurement device 1, the light quantity measurement sensor 3 is placed on the horizontal plane X so that the protective projection 26 is in contact with the horizontal plane X with the globe 21 facing downward. If the glove 21 is formed with the protruding length 26 that is not in contact with the horizontal plane X, even if the light quantity measuring sensor 3 (light quantity measuring device 1) is accidentally dropped, the protection is provided. Since the projecting portion 26 is in contact with the horizontal plane X (the ground or floor surface) and the globe 21 is not in contact with the horizontal plane X, a gap S is generated between the globe 21 and the horizontal plane X. A situation in which the globe 21 is damaged or deformed can be preferably avoided. As a result, the optical characteristics of the globe 21 can be maintained in the initial state. As a result, the measurement target light is suitably guided to the filter unit 22 and the photoelectric conversion unit 23 by the globe 21 and the amount of light is accurately measured. Can be maintained.

  In addition, according to the light quantity measuring sensor 3 and the light quantity measuring device 1, the protective protrusion 26 is configured by including two convex portions formed at positions facing each other across the globe 21 on the one surface 24a. For example, even if the light quantity measuring sensor 3 (light quantity measuring device 1) falls in a tilted state, any one of the two convex portions constituting the protective protruding portion 26 is first on the horizontal plane X (the ground surface or the floor surface). As a result of being able to reliably avoid the situation in which the globe 21 comes into contact with the horizontal plane X, the situation in which the globe 21 is damaged or deformed can be suitably avoided, and thereby the amount of light can be accurately measured. The state can be reliably maintained.

  Furthermore, according to the light quantity measuring sensor 3 and the light quantity measuring device 1, the height H25 of the light shielding wall 25 is lower than the second height H21 of the globe 21 (the projection length is short), and the protective projection. By forming the height 26 of the portion 26 to be higher than the height H21 of the globe 21 (the projection length is longer), the protective projection 26 prevents the globe 21 from being damaged or deformed, and is perpendicularly incident. As a result of being able to suitably limit the incident amount of the measurement target light to the globe 21 from the direction crossing the direction, the measurement process standardized by JIS or the like can be suitably executed.

  As an example, the light quantity measuring sensor 3 (light quantity measuring apparatus 1) having a protective protruding part 26 having two convex parts formed at positions facing each other across the globe 21 as a “cover part”. Although described above, the configuration of the “light quantity measuring sensor” is not limited to this. For example, a plurality of pairs of convex portions formed at positions facing each other with the “cover portion” interposed therebetween (provided with four or more convex portions) can constitute the “projecting portion”. Specifically, as an example, in addition to the two protrusions constituting the protective protrusion 26 in the light quantity measurement sensor 3 described above, two protrusions are further provided at positions facing each other across the globe 21 in the vertical direction in FIG. The “protruding portion” can be formed by a total of four convex portions (two sets of convex portions) (not shown).

  Further, as in the light quantity measuring sensor 3a (another example of the “light quantity measuring sensor”) in the light quantity measuring apparatus 1A (another example of the “light quantity measuring apparatus”) illustrated in FIG. Another example of the “protrusion” can be configured as a protective protrusion 26a by including three protrusions scattered around the globe 21 on the one surface 24a of another example of the “case”. In the figure, the projecting end portions (projecting end surfaces) of the respective convex portions constituting the protective protruding portion 26a are filled with a mesh line.

  Further, the light quantity measuring device 1A and light quantity measuring devices 1B and 1C (see FIGS. 6 to 9), which will be described later, include a measuring device main body 2 in the same manner as the light quantity measuring device 1 described above. Since the configuration of 2 is the same as that of the measuring device main body 2 of the light quantity measuring device 1, illustration and detailed description thereof are omitted. Furthermore, in the light quantity measuring devices 1A to 1C and the light quantity measuring device 1D (FIGS. 10 to 12) described later, components having the same functions as those of the light quantity measuring device 1 are denoted by the same reference numerals and redundant description is omitted. To do. In this case, in the light quantity measuring sensor 3a (light quantity measuring device 1A), the height from the one surface 24a of each convex portion constituting the protective protrusion 26a is the above-described light quantity measuring sensor 3 (light quantity measuring device 1). The sensor housing 20a is configured to be the same as the height H26 of both convex portions of the protective protruding portion 26 in FIG.

  Therefore, by adopting such a configuration, for example, even if the light amount measuring sensor 3a (light amount measuring device 1A) falls in a tilted state, any of the convex portions constituting the protective protruding portion 26a is As a result of reliably avoiding the situation where the globe 21 contacts the horizontal plane X by first contacting the horizontal plane X (the ground or floor surface), the situation where the globe 21 is damaged or deformed can be suitably avoided. Thus, it is possible to reliably maintain a state in which the light amount can be accurately measured. In addition, instead of the configuration of the light quantity measuring sensor 3a described above, even when the “projection portion” is configured by including four or more convex portions scattered around the globe 21 on the one surface 24a (not shown). 1), the same effects as those of the light quantity measuring sensor 3a (light quantity measuring device 1A) can be obtained.

  In addition, in the light quantity measurement sensor 3b (a further example of the “light quantity measurement sensor”) in the light quantity measurement apparatus 1B (a further example of the “light quantity measurement apparatus”) shown in FIG. A protective protrusion 26b, which is still another example of the “protrusion”, is configured by including an annular protrusion formed on one surface 24a of the body 20b (a further example of the “sensor housing”). In the figure, the projecting end portion (projecting end surface) of the annular projecting portion constituting the protective projecting portion 26b is illustrated with a mesh line. In this case, also in the light quantity measuring sensor 3b (light quantity measuring apparatus 1B), the height from the one surface 24a of the annular convex portion constituting the protective protrusion 26b is equal to the above-described light quantity measuring sensor 3 (light quantity measuring apparatus 1). The sensor housing 20b is configured so as to be the same as the height H26 of both convex portions of the protective protrusion 26 in FIG.

  Therefore, by adopting such a configuration, for example, even if the light quantity measuring sensor 3b (light quantity measuring device 1B) falls in a tilted state, any one of the annular convex portions constituting the protective protruding portion 26b. As a result of reliably avoiding a situation where the part first contacts the horizontal plane X (the ground or the floor) and the globe 21 contacts the horizontal plane X, a situation where the globe 21 is damaged or deformed is preferably avoided. Thus, it is possible to reliably maintain a state in which the amount of light can be accurately measured. Instead of the above configuration of the light quantity measuring sensor 3b, a configuration in which a part of the annular convex portion constituting the protective protruding portion 26b is cut away (a configuration in which the “protruding portion” is C-shaped in front view: FIG. (Not shown) can provide the same effects as the light quantity measuring sensor 3b (light quantity measuring device 1B).

  On the other hand, in the light quantity measurement sensor 3c (a further example of the "light quantity measurement sensor") in the light quantity measurement apparatus 1C (a further example of the "light quantity measurement apparatus") shown in FIGS. , 3a and 3b on the protruding end of the light shielding wall 25c (another example of the “annular light shielding part”) formed in the sensor housing 20c (a further example of the “sensor housing”) in the same manner as the light shielding wall 25 in FIGS. In addition, an annular convex portion is formed of a light-transmitting material (for example, a resin material such as acrylic resin) that can transmit the measurement target light, and this annular convex portion further protects the protruding portion 26c ("protruding portion"). Another example) is configured. In FIG. 7, the projecting end portion (projecting end surface) of the annular projecting portion constituting the protective projecting portion 26 c is illustrated by being filled with a mesh line.

  In this case, as shown in FIG. 8, in this light quantity measuring sensor 3c (light quantity measuring apparatus 1C), one surface 24a is arranged so that the light shielding wall 25c has the same light shielding characteristics as the light shielding wall 25 such as the light quantity measuring sensor 3. The height H25 of the light shielding wall 25c is defined in the same manner as the height H25 of the light shielding wall 25 of the light quantity measuring sensor 3 or the like. Further, the height H26c from the projecting end portion (projecting end surface) of the light shielding wall 25c to the projecting end portion of the protective protruding portion 26c is the sum of the height H25 of the light shielding wall 25c and the height H21 of the globe 21 from the one surface 24a. (As an example, it is specified to be equal to the height H26 of the protective projection 26 of the light quantity measuring sensor 3).

  In the light quantity measuring sensor 3c (light quantity measuring apparatus 1C), as described above, the protective protrusion 26c is formed of a light transmissive material. Therefore, as shown by the arrow L1 in FIG. 8, the incident light is irradiated to the range of the arrow A in the globe 21 without being blocked by the protective protrusion 26c. Thereby, the irradiation amount measurement (illuminance measurement) similar to the light amount measuring sensor 3 (light amount measuring device 1) or the like can be executed.

  Further, in this light quantity measuring sensor 3c (light quantity measuring device 1C), even if it is accidentally dropped, as shown in FIG. 9, the projecting end portion (projecting end surface) of the annular convex portion constituting the protective projecting portion 26c. ) Is in contact with the horizontal plane X (the ground or floor surface), and the tip of the globe 21 is not in contact with the horizontal plane X as shown in FIG. In this state, a gap S is generated. Thereby, the situation where the glove 21 is damaged or deformed is preferably avoided.

  Therefore, according to the light quantity measurement sensor 3c and the light quantity measurement device 1C adopting such a configuration, the protection projection 26c is formed on the light shielding wall 25c, so that the light quantity measurement sensor 3c (light quantity measurement device 1C) is configured. ) Is sufficiently miniaturized, and the protection projection 26c avoids damage and deformation of the globe 21, and the amount of incident light to be measured on the globe 21 from the direction intersecting the vertical incidence direction is preferably adjusted by the light shielding wall 25c. Can be limited.

  Instead of the above configuration of the light quantity measuring sensor 3c, a configuration in which a part of the annular convex portion constituting the protective protruding portion 26c is cut away (a configuration in which the “protruding portion” is C-shaped in front view: FIG. Not shown), a configuration in which the annular convex portion constituting the protective protruding portion 26c is divided into two or more (a configuration in which two convex portions are formed at positions on the light shielding wall 25c facing each other across the globe 21, or Even in a configuration in which three or more convex portions are scattered on the light shielding wall 25c so as to surround the globe 21 (not shown), the same effects as those of the light quantity measuring sensor 3b (light quantity measuring device 1B) can be obtained. Can do.

  Further, although the light amount measuring devices 1 and 1A to 1C in which the “sensor for measuring light amount” and the “measuring device main body” provided with the “measuring unit” and the like are separately described have been described, the light amount measuring devices 1 and 1A to 1C are described. The light quantity measuring sensors 3, 3 a to 3 c in 1 </ b> C and the measuring device main body 2 can be integrally formed so as not to be separated. Also in the “light quantity measuring apparatus” adopting such a configuration, the same effects as those of the light quantity measuring apparatuses 1 and 1A to 1C described above can be obtained.

  Further, in the configuration in which the “light quantity measuring sensor” and the “measuring device main body” are integrally formed, for example, as in the light quantity measuring device 1D shown in FIGS. The projecting portion 36 may be formed on the device housing 30 (an example of “device housing”). In FIG. 10, the projecting end portion (projecting end surface) of the projecting portion constituting the protective projecting portion 36 is illustrated by being filled with a mesh line.

  In the light amount measuring apparatus 1D, the sensor unit 3d is disposed in the apparatus housing 30, and the light amount (irradiation amount) of the measurement target light based on the sensor signal output from the sensor unit 3d (an example of the “sensor unit”). Measurement unit (not shown) for measuring (illuminance) is accommodated in the apparatus housing 30. The sensor unit 3d is configured to include the globe 21, the filter unit 22, and the photoelectric conversion unit 23 in the same manner as the light quantity measurement sensors 3 and 3a to 3c described above. The globe 21 is fitted from the inside of the apparatus housing 30 into the opening 34b formed in 34a, and the globe 21 is projected toward the front side in the vertical incident direction.

  Further, as shown in FIG. 11, in this light quantity measuring apparatus 1D, the height H36 from the one surface 34a to the protruding end of the protective projection 36 in the apparatus housing 30 is higher than the height H21 of the globe 21 from the one surface 34a. Is higher (the protrusion length is longer). In this light quantity measuring device 1D, even if it is accidentally dropped, as shown in FIG. 12, the projecting end portion (projecting end surface) of the projecting portion constituting the protective projecting portion 36 and the projecting end portion of the light shielding wall 25 Is in contact with the horizontal plane X (the ground or floor surface), and as shown in the figure, the tip of the globe 21 is not in contact with the horizontal plane X, so that the gap between the globe 21 and the horizontal plane X is A gap S is generated. Thereby, also in this light quantity measuring device 1D, the situation where the glove 21 is damaged or deformed is preferably avoided.

  Therefore, according to this light quantity measuring device 1D, even if it is accidentally dropped, the portion other than the protective protrusion 36 and the protective protrusion 36 in the device housing 30 (in this example, the light shielding wall 25) is horizontal. Since the globe 21 is in contact with X (the ground surface or the floor surface) and is not in contact with the horizontal plane X, a situation in which the globe 21 is damaged or deformed can be suitably avoided. As a result, the optical characteristics of the globe 21 can be maintained in the initial state. As a result, the measurement target light is suitably guided to the filter unit 22 and the photoelectric conversion unit 23 by the globe 21 and the amount of light is accurately measured. Can be maintained.

  Although the description has been given by taking as an example the light quantity measuring device 1D having a configuration in which the protective protrusion 36 and the light shielding wall 25 are in contact with the horizontal plane X and the globe 21 is in a non-contact state with respect to the horizontal plane X, Instead of such a configuration, for example, the protective protrusion 36 and the upper edge (the edge of the one surface 34 a) of the device housing 30 are in contact with the horizontal plane X so that the globe 21 is positioned with respect to the horizontal plane X. A configuration in a non-contact state can also be employed (not shown). Also in the “light quantity measuring apparatus” adopting such a configuration, the same effects as those of the light quantity measuring apparatus 1D can be obtained.

  In addition, the configuration of the “illuminance meter”, which is an example of the “light intensity measurement device”, has been described as an example, but the “color illuminance meter”, “ultraviolet intensity meter”, “photo exposure meter”, and “photo color” Various types of “light quantity measuring devices” such as “meters”, and “light quantity measuring sensors” that can be used in such “light quantity measuring devices” can also employ the same configuration as the above exemplified configuration (see FIG. Not shown).

DESCRIPTION OF SYMBOLS 1,1A-1D Light quantity measuring apparatus 2 Measuring apparatus main body 3,3a-3c Light quantity measuring sensor 3d Sensor part 4 Connection cable 10,30 Apparatus housing 20, 20a-20c Sensor housing 21 Globe 22 Filter part 23 Photoelectric conversion part 24a, 34a One surface 24b, 34b Opening 25, 25c Light-shielding wall 26, 26a-26c, 36 Protective protrusion H21, H25, H26, H26c, H36 Height S Clearance X Horizontal plane θ Cross angle

Claims (9)

A cover part, a filter part, and a photoelectric conversion part are arranged in this order in the sensor casing along the incident direction of the measurement target light, and one surface on the light receiving surface side of the sensor casing toward the near side in the incident direction The light amount measurement is configured such that the cover portion is protruded from the sensor unit and the sensor signal corresponding to the amount of light of the measurement target light that is transmitted through the cover portion and the filter portion and received by the photoelectric conversion portion can be output. Sensor for
It is formed around the cover part so as to be able to regulate the incidence of light on the cover part from a direction that intersects at an angle exceeding a predetermined angle with respect to the vertical incident direction of the measurement target light with respect to the photoelectric conversion part. With an annular light shield,
The sensor housing is provided with a protrusion protruding from the one surface toward the front side in the vertical direction of incidence,
The annular light shielding portion is formed such that a first protruding length from the one surface to the protruding end portion of the annular light shielding portion is shorter than a second protruding length from the one surface to the protruding end portion of the cover portion. ,
The protrusion, the third protrusion length to projecting end of the projecting portion from the one side, the longer than the second protrusion length, and the projecting portion in the horizontal plane in a state in which the cover portion downwardly Light transmittance that allows the measurement target light to be transmitted by defining the cover portion so as to be in non-contact with the horizontal plane when the light quantity measurement sensor is placed on the horizontal plane so as to be in contact with the sensor . A light quantity measuring sensor formed on a protruding end portion of the annular light shielding portion by a material .   2. The light quantity measuring sensor according to claim 1, wherein the protruding portion includes at least two convex portions formed at positions facing each other across the cover portion on the one surface.   2. The light quantity measuring sensor according to claim 1, wherein the protruding portion includes at least three convex portions that are scattered around the cover portion on the one surface.   The light quantity measuring sensor according to claim 1, wherein the protruding portion includes an annular convex portion formed on the one surface so as to surround the cover portion. A sensor for measuring light quantity according to any one of claims 1 to 4 ,
A light quantity measuring device comprising: a measurement unit that measures the light quantity of the measurement target light based on the sensor signal output from the light quantity measurement sensor. A cover part, a filter part, and a photoelectric conversion part are arranged in this order in the device casing along the incident direction of the measurement target light, and one surface on the light receiving surface side of the apparatus casing toward the near side in the incident direction The sensor unit is configured to output the sensor signal corresponding to the amount of the measurement target light received by the photoelectric conversion unit through the cover unit and the filter unit while the cover unit is projected from When,
A light quantity measuring device including a measurement unit configured to be able to measure the light quantity of the measurement target light based on the sensor signal output from the sensor unit and housed in the device housing;
It is formed around the cover part so as to be able to regulate the incidence of light on the cover part from a direction that intersects at an angle exceeding a predetermined angle with respect to the vertical incident direction of the measurement target light with respect to the photoelectric conversion part. With an annular light shield,
The device housing includes a protrusion protruding from the one surface toward the front side in the vertical direction of incidence,
The annular light shielding portion is formed such that a first protruding length from the one surface to the protruding end portion of the annular light shielding portion is shorter than a second protruding length from the one surface to the protruding end portion of the cover portion. ,
The protrusion, the third protrusion length to projecting end of the projecting portion from the one side, the longer than the second protrusion length, and the projecting portion in the horizontal plane in a state in which the cover portion downwardly A light-transmitting material in which the cover portion is defined to have a protruding length that is not in contact with the horizontal plane when the light amount measuring device is placed on the horizontal plane so as to be in contact with the measurement target light. The light quantity measuring device formed on the protruding end portion of the annular light shielding portion . The light quantity measuring device according to claim 6 , wherein the protruding portion includes at least two convex portions formed at positions facing each other across the cover portion on the one surface. The light quantity measuring device according to claim 6 , wherein the protruding portion includes at least three convex portions that are scattered around the cover portion on the one surface. The light quantity measuring device according to claim 6 , wherein the projecting portion includes an annular convex portion formed on the one surface so as to surround the cover portion.

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