JP5531859B2 - Manufacturing method of lighting control device - Google Patents

Description

  The present invention relates to a method for manufacturing a lighting control device.

  As this type of technology, there is an auto light system that automatically turns on and off a head lamp / tail lamp of an automobile or the like in accordance with a measured value of illuminance outside the vehicle. For example, in Patent Document 1, an optical sensor circuit including an illuminance sensor such as a photodiode and a current detection resistor are connected in series to a detection line extending from a power source to ground in an auto light control unit. A technique is disclosed in which lighting control of illumination such as a vehicle headlight is performed based on a voltage generated in the vehicle.

JP-A-8-5456

  As described above, in the system that measures the illuminance of external light by the illuminance sensor and controls the predetermined illumination based on the measurement value obtained by the measurement, the illuminance of external light with the same brightness was measured under the same conditions. However, the measurement value obtained by this measurement may be different for each system. This is due to the existence of variations in the performance of the illuminance sensor itself for each system. For this reason, in the system described in Patent Document 1, the lighting / lighting timing may be different for each system (for each vehicle). In other words, even under the same environment, the lighting control content (lighting-on / off timing) may vary from system to system.

  This invention is made | formed in view of such a point, The place made into the objective is to suppress that the control content of illumination changes for every illumination control apparatus in the same environment.

A method for manufacturing a lighting control device according to the present invention includes:
A storage unit that stores a correspondence table between the measurement value of the illuminance of the external light and the control information of the illumination, and the illumination control information corresponding to the measurement value obtained by measuring the illuminance of the external light using the illuminance sensor Is obtained by referring to the correspondence table stored in the storage unit, and a control unit that controls the illumination based on the acquired control information of the illumination, and a manufacturing method of an illumination control device comprising:
An assembling step of assembling the illuminance sensor to an assembling target;
A measurement step of illuminating the illuminance sensor assembled to the assembly target in the assembly step with reference light, and measuring the illuminance of the reference light using the illuminance sensor;
The measurement value obtained by measurement in the measurement step is compared with a predetermined reference value, and based on the comparison result, the measured value of the illuminance of the external light and the illumination control information according to the comparison result And a writing step of writing the created correspondence table in the storage unit as the correspondence table;
Is provided.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the control content of illumination changes for every illumination control apparatus manufactured in the same environment.

It is an external view of the meter for vehicles concerning one embodiment of the present invention. It is the sectional view on the AA line of FIG. It is a block diagram of the instrument for vehicles of FIG. It is a figure which shows the illumination intensity and measurement voltage characteristic which are the relationship between the illumination intensity which the vehicle meter of FIG. 1 measures, and a measurement voltage. It is a figure which shows an example of the content of the measurement voltage and duty ratio correspondence table used with the vehicle meter of FIG. It is a schematic sectional drawing explaining a state when a reference | standard light source device is applied to the vehicle meter of FIG.

  Embodiments according to the present invention will be described with reference to the drawings. In addition, this invention is not limited by the following description and drawing. It goes without saying that the configuration and the like shown in the following description and the drawings can be changed as appropriate (including deletion of components). Moreover, in the following description, in order to make an understanding of this invention easy, description of a known technical matter is abbreviate | omitted suitably.

  First, an illumination control device manufactured according to this embodiment will be described with reference to FIGS. The illumination control device in the present embodiment is a vehicle meter 1 mounted on a vehicle (automobile or the like) shown in FIG. In FIG. 2, hatching representing a cross section is omitted for easy understanding of the drawing.

  As shown in FIGS. 1 and 2, the vehicular instrument 1 includes a casing 11, a substrate 12, a light emitting element 13, a pointer 14, a transmission part 15, a support part 16 as main components. The illuminance sensor 17 and the indicator plate 18 are provided.

  The casing 11 has a transparent window portion 11a on the front surface, and is configured by combining a plurality of predetermined members such as an upper case, an intermediate case, and a lower case. The housing 11 houses the substrate 12, the light emitting element 13, the pointer 14, the support portion 16, the illuminance sensor 17, and the indicator plate 18 inside. In addition, a through hole that communicates the inside and the outside is formed in the housing 11, and a transmission portion 15 is attached in the through hole.

  The substrate 12 is disposed inside the housing 11. In particular, the substrate 12 is disposed behind the indicator plate 18 (on the side opposite to the window portion 11a) and separated from the indicator plate 18. A light emitting element 13, an illuminance sensor 17, and the like are mounted on the substrate 12. Other elements, circuits, wirings, and the like are also mounted on the substrate 12, and a control unit 20 and a storage unit 30 that will be described later are configured by these elements. What is mounted on the substrate 12 is also housed inside the housing 11 together with the substrate 12. The control unit 20 is electrically connected to the light emitting element 13 and the illuminance sensor 17.

  The light emitting element 13 emits light under the control of the control unit 20. The light emitting element 13 illuminates the indicator plate 18 from behind. Although only one light emitting element 13 is depicted for each meter in FIG. 1, there are actually a plurality of light emitting elements 13 (may be one). Further, the light emitting element 13 may be disposed on the substrate 12 so as to illuminate the pointer 14 and the like from behind. The light emitting element 13 includes an LED (Light Emitting Diode) or the like. In the present embodiment, the light emitting element 13 serves as illumination for illuminating the inside of the vehicle meter 1.

  The pointer 14 is attached to a rotating shaft mounted on the substrate 12 and is disposed on the front side of the indicator plate 18 (opposite side of the back side). The pointer 14 rotates along with the rotation of the rotation shaft (for example, controlled by the control unit 20), and indicates the indicator portion (scale) of the indicator plate 18. Thus, for example, the speed is displayed by the left hand pointer 14 in FIG. 1, and the engine speed is displayed by the right hand hand guide 14 in FIG.

  The transmission part 15 is configured by a translucent member that transmits only a part of the external light (light outside the vehicle instrument 1 that reaches the vehicle instrument 1), such as a smoke lens and smoke glass, It is attached to the through hole of the housing 11 and closes the through hole. The transmission unit 15 is located on the front side of the illuminance sensor 17. The vehicular instrument 1 is configured such that only the light transmitted through the transmission part 15 reaches the illuminance sensor 17.

  The support unit 16 is fixed to the substrate 12 and supports the illuminance sensor 17.

  The illuminance sensor 17 is mounted on the substrate 12 by being supported by the support unit 16. The illuminance sensor 17 is a light receiving element such as a photodiode. The illuminance sensor 17 is used for measuring the illuminance of external light. The illuminance sensor 17 is supported by the support unit 16 so that the light receiving surface thereof faces the front side of the substrate 12, that is, the upper side of the substrate (upper side in FIG. 2) and is located above the light receiving surface. Is approaching. Thereby, the illuminance sensor 17 can easily receive the light transmitted through the transmission unit 15. The illuminance sensor 17 receives light transmitted through the transmission unit 15 and supplies a current (analog detection signal) having a current value corresponding to the brightness (illuminance) of the received light to the control unit 20. Since the light transmitted through the transmission unit 15 is a part of the external light, the illuminance sensor 17 supplies a current having a current value corresponding to the illuminance of the external light to the control unit 20. The illuminance sensor 17 supplies more current as the amount of received light increases, that is, as the illuminance of outside light increases. Note that the relationship between the illuminance of external light and the amount of current supply (current supply characteristics) is basically approximately proportional.

  Since the transmission part 15 is a smoke lens, smoke glass, or the like, the internal structure of the illuminance sensor 17 or the like can be made darker and less conspicuous than the outside, and such a vehicle instrument 1 is excellent in design. It will be a thing. In addition, the transmission part 15 can enlarge the detection range of external light (that is, the range of external light received by the illuminance sensor 17) with respect to the position of the sun and the external light (incident angle) by providing a lens-shaped convex part. In addition, external light passes through the transmissive part 15 and reaches the illuminance sensor 17, but since the transmissive part 15 is a translucent member that allows only a part of the external light to pass, The brightness is darkened and softened. As a result, the current flowing out from the illuminance sensor 17 is suppressed, and the load and heat generation of various electronic components including the illuminance sensor 17 may be reduced.

  The indicator plate 18 is a sheet-like member and is supported by, for example, the middle case of the housing 11. The indicator plate 18 is configured by, for example, forming a predetermined decorative layer representing a scale or the like on a translucent synthetic resin sheet-like member, and a predetermined amount of light emitted from the light emitting element 13, Transmits at a predetermined position. As a result, when illuminated from behind from the light emitting element 13, the front side of the indicator plate 18 shines brightly. Thereby, the inside of the vehicle meter 1 is illuminated.

  Next, the structure of the control part 20 and the memory | storage part 30 comprised on the board | substrate 12 of the vehicle meter 1 is demonstrated with reference to FIG. The control part 20 is provided with the resistance R, the microcomputer (microcomputer) 21, and the output control part 22 as the main structures, for example. In FIG. 3, there is one light emitting element 13, but there are actually a plurality of light emitting elements 13, and each of the plurality of light emitting elements 13 is controlled in the same manner.

  The resistor R is a resistor that is mounted on the substrate 12 and converts a current flowing from the illuminance sensor 17 into a voltage. One end of the resistor R is connected to the microcomputer and the illuminance sensor 17, and the other end is connected to the ground. The voltage converted by the resistor R is applied to the microcomputer 21.

  The microcomputer 21 is an appropriate device such as a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), various input / output ports, and an A / D (analog / digital conversion circuit) connected to the resistor R. And is mounted on the substrate 12. The microcomputer 21 performs an operation described later, and this operation is realized by the CPU performing a process according to a program recorded in the ROM. The microcomputer 21 performs processing using data or the like recorded in the ROM or the storage unit 30. The microcomputer 21 is connected to the resistor R and is also connected to the storage unit 30 and the output control unit 23. A voltage converted by the resistor R is applied to A / D. The A / D samples this voltage every predetermined period (for example, several seconds), converts it into a measurement voltage Vx that is a digital value, and supplies the measurement voltage Vx to the CPU.

  As described above, if the illuminance of outside light is large, the current supplied from the illuminance sensor 17 also increases. For this reason, if the current (supply current) supplied from the illuminance sensor 17 is large, the measurement voltage Vx also increases. Since the amount of light received by the illuminance sensor 17 and the supply current from the illuminance sensor 17 are in a substantially proportional relationship, the illuminance of external light and the measurement voltage Vx are in a proportional relationship as shown in FIG.

  The microcomputer 21 (CPU) refers to the measurement voltage / Duty ratio correspondence table recorded in the storage unit 30 based on the measurement voltage Vx supplied from the A / D to the CPU, and outputs the PWM signal corresponding to the measurement voltage Vx. Get the duty ratio. As will be described in detail later, the measurement voltage / duty ratio correspondence table is a table in which each data indicating each value of the measurement voltage Vx and each data indicating each duty ratio are recorded in the storage unit 30 in association with each other. The relationship between the measurement voltage Vx and the duty ratio is, for example, as shown in FIG. When acquiring the duty ratio, the microcomputer 21 (CPU) generates a PWM (Pulse Width Modulation) signal having the duty ratio and supplies the generated PWM signal to the output control unit 22.

  The output control unit 23 is a switching circuit configured by predetermined circuit elements configured on the substrate 12. The output control unit 23 is turned on during the period of the High signal in the PWM signal supplied from the microcomputer 21, and causes a current necessary for light emission to flow through the light emitting element 13. The output control unit 23 is turned off during the Low signal period of the PWM signal supplied from the microcomputer 21, and does not flow a current necessary for light emission to the light emitting element 13. Since the luminance of the light emitting element 13 depends on the length of the light emitting period (that is, the ON period in which the current required for light emission is supplied from the output control unit 23), this luminance corresponds to the change in the duty ratio of PWM. Will change. If the duty ratio of the PWM signal is increased, the period during which the PWM signal is a high signal is lengthened, and the ON period of the output control unit 23 is lengthened accordingly, and the current from the output control unit 23 to the light emitting element 13 is increased. The supply period becomes longer, the light emission period of the light emitting element 13 becomes longer, and the light emission luminance of the light emitting element 13 becomes higher. The reverse occurs when the duty ratio of the PWM signal is reduced.

  The storage unit 30 is configured by a nonvolatile memory such as an EEPROM (Electrically Erasable Programmable ROM) or a flash memory, and stores predetermined data. In particular, the storage unit 30 stores a measurement voltage / duty ratio correspondence table.

  The vehicle instrument 1 includes a control unit 20 and an external computer so that the control unit 20 can be controlled from the outside and the storage unit 30 can be controlled from the outside via the control unit 20 (microcomputer 21). Configured to be connectable. Specifically, it is used for communication with the vehicle side on which the vehicle meter 1 is mounted, and a communication connector (not shown) mounted on the substrate 12 is diverted, and through this communication connector, the microcomputer 21, A cable is connected to an external computer provided outside the housing 11 of the vehicle instrument 1. Accordingly, each component such as the casing 11 and the substrate 12 of the vehicle instrument 1 is assembled (particularly, the vehicle instrument 1 main body described later or the finished state of the vehicle instrument 1). In addition, data can be written / updated in the storage unit 30. By writing / updating in a state where each part is assembled, it is possible to write / update data in the storage unit 30 in consideration of individual variations such as the external light transmittance, shape, and assembly position in the transmission unit 15. In addition, it is possible to reduce the time of the assembling process that requires careful attention such as dust contamination. In addition, a connection other than the communication connector, for example, a dedicated land or a dedicated wiring is prepared on the board 12 and connected to an external computer so that data can be written / updated in the storage unit 30. It is also possible.

  As described above, in the control unit 20, the A / D digitally converts the current corresponding to the illuminance of external light into the measurement voltage Vx. In the present embodiment, the control unit 20 thereby measures the illuminance using the illuminance sensor 17. The measurement voltage Vx represents the illuminance detected by the illuminance sensor 17, and is a measured value of illuminance. Further, the control unit 20 refers to the correspondence table based on the measured voltage Vx measured in the above process, acquires the duty ratio of the PWM signal from the storage unit 30, and only the period of the acquired high signal of the duty ratio. The light emitting element 13 is caused to emit light. Since the duty ratio of the PWM signal is a value for controlling the light emission luminance of the light emitting element 13, the duty ratio of the present embodiment corresponds to the control information of the light emitting element 13.

  The control unit 20 includes a current amplification circuit between the resistor R and the illuminance sensor 17 so that a sufficient voltage is applied to the microcomputer 21, or a low-pass filter or the like between the microcomputer 21 and the resistor R. You may prepare.

  The vehicle instrument 1 as described above uses the illuminance sensor 17 to store the illuminance of external light using the storage unit 30 that stores a measurement voltage / duty ratio correspondence table between the measurement value of the illuminance of external light and the control information of the illumination. Control which measures and acquires the illumination control information corresponding to the measurement value obtained by this measurement with reference to the correspondence table stored in the storage unit 30, and controls the illumination based on the acquired illumination control information The illuminance of the external light is first measured by the illuminance sensor, and the light emitting element 13 is caused to emit light with the luminance corresponding to the measured illuminance, so that the inside of the vehicle instrument 1 such as the indicator plate 18 is provided. The illumination is performed with brightness according to the brightness of the outside of the vehicle instrument 1. Here, when the external brightness is high, the illumination is controlled to be bright so that the indicator portion of the indicator plate 18 and the like are easy to see. As a result, the indicator portion of the indicator plate 18 is illuminated with a brightness corresponding to the brightness of the external light, so that the driver of the vehicle equipped with the vehicle meter 1 can easily see the indicator portion.

  Next, the manufacturing method of the some instrument 1 for vehicles is demonstrated. In this manufacturing method, the assembly of the vehicle meter 1 can be performed by an appropriate method. However, even if the vehicle meter 1 has the same structure, the performance of each product is slightly different. For example, even if the illuminance is the same, the measurement voltage Vx obtained by measuring the illuminance may vary depending on the product. This is because of variations in the performance (current supply characteristics) of the illuminance sensor 17 in each vehicle instrument 1 (for example, the straight line A moves up and down in the graph of FIG. 4), and the mounting position of the illuminance sensor 17 in each vehicle instrument 1 And the variation in the transmission amount of the transmission part 15 in each vehicle instrument 1. In such a case, when each product uses the measurement voltage / duty ratio correspondence table having the same content, the brightness of the illumination may be different even with the same illuminance. In the present embodiment, by generating a measurement voltage / Duty ratio correspondence table in consideration of this variation, each product can illuminate with the same brightness with respect to the same illuminance. Hereinafter, the manufacturing method of the vehicle instrument 1 will be described focusing on this method.

  First, various parts of the vehicle instrument 1 are prepared, the prepared parts are assembled, and the vehicle instrument 1 at a stage where the measured voltage / Duty ratio correspondence table has not yet been recorded in the storage unit 30 (hereinafter referred to as this The vehicle instrument 1 is referred to as a vehicle instrument body). If the vehicle instrument 1 main body having the above structure can be obtained, the assembling method is arbitrary.

  Next, any one vehicle instrument 1 body is selected as a master sample body from a plurality of vehicle instrument 1 bodies (note that the selected vehicle instrument 1 is used as a master sample), and this master. The microcomputer 21 and the storage unit 30 of the sample main body are connected to an external computer or the like, and the microcomputer 21 and the storage unit 30 are controlled by the external computer.

  Next, the master sample body is illuminated with a predetermined illumination light source (that is, illuminated with external light), and the microcomputer 21 is controlled by an external computer to cause the light emitting element 13 to emit light with a duty ratio of 50%. Then, the external light is changed from a dark state to a bright state by an arbitrary method, and the brightness of the external light (that is, the external brightness of the vehicle instrument 1) and the brightness in the master sample body are visually observed by a person. When the relationship with (the brightness of the illumination by the light emitting element 13) is confirmed and the inside of the master sample body (for example, the indicator portion of the indicator plate 18) becomes easy to see (that is, the inside of the vehicle instrument 1 is not too bright) Specify the brightness of the outside light. Then, the microcomputer 21 is controlled by the external computer, and the measurement voltage Vx at this time is output from the microcomputer 21 to the external computer. The external computer stores the measurement voltage Vx output from the microcomputer 21. This is also done when the duty ratio is set to 100%, and the measurement voltage V2 is obtained.

  As described above, when the external light gradually becomes brighter, it is better to start the light emitting element 13 by setting the duty ratio to 50% and 100%. The measurement voltages V1 and V2 of the illuminance of the external light are specified. Is done. Note that when the external light gradually becomes brighter, the duty ratio is basically set to 10% before the duty ratio is set to 50%. That is, in the vehicle meter 1, basically, the light emitting element 13 is caused to emit light by setting the duty ratio to 10%, 50%, and 100%, and the interior of the vehicle meter 1 is illuminated.

  Next, the external computer creates a measurement voltage / Duty ratio correspondence table based on the measurement voltages V1 and V2 based on a human operation and the like, and stores it in the storage unit. At this time, the external computer creates and stores the measurement voltage / duty ratio correspondence table as a reference table so that the contents of the correspondence table (relationship between the measurement voltage Vx and the duty ratio) are in the form of the curve X in FIG. . As indicated by the curve X, in the present embodiment, the luminance of the light emitting element 13 is mainly set in three stages of duty ratios of 10%, 50%, and 100%. In addition, in the curve X, the duty ratio changes smoothly in the vicinity of the measurement voltages V1 and V2 so that the luminance of the light emitting element 13 does not change abruptly with the measurement voltages V1 and V2 as boundaries.

  Next, the reference light source device 50 is applied to the housing 11 so as to cover the transmission part 15 of the master sample body (see FIG. 6). As shown in FIG. 6, the reference light source device 50 includes, for example, a cylindrical body 51 having openings at both ends, and a light source unit 52 including a light emitting element such as an LED that closes an opening at one end of the cylindrical body 51. Composed. In FIG. 6, hatching is appropriately omitted in order to make the drawing easier to see. The light source unit 52 is connected to, for example, the external computer, and can cause the light emitting element to emit light with an arbitrary luminance under the control of the external computer. This light emission illuminates the transmissive portion 15, and the light reaches the illuminance sensor 17. The shape of the opening at the other end of the cylindrical body 51 is such that when this opening is applied to the reference light source device 50, external light does not enter the cylindrical body 51 and reach the transmission section 15. The shape matches the shape of the casing 11 (the shape around the transmission portion 15). Thereby, the illuminance sensor 17 receives only light from the light source unit 52.

  Next, the light source unit 52 is controlled by an external computer so that the light emitting element of the light source unit 52 emits light while changing the light emission luminance, and the microcomputer 21 outputs the measurement voltage Vx, and the microcomputer 21 outputs the measurement voltage. The control content of the light source unit 52 when Vx becomes V1 and V2 is stored in the storage unit of the external computer. In the master sample main body, the relationship between the luminance of the light emitting element of the light source unit 52 (that is, the illuminance of light emitted from the light emitting element) and the measurement voltage Vx is, for example, as shown by a straight line A in FIG. The reference light 1 and the reference light 2 in FIG. 4 are light of the light emitting element when the measurement voltage Vx becomes V1 and V2. The external computer stores the control contents when the external computer causes the light emitting element to emit the reference light 1 and the control contents when the reference light 2 is emitted.

  Next, the following method is performed for each of the plurality of vehicle instrument 1 bodies assembled as described above except for the master sample. For each vehicle instrument 1 body, the microcomputer 21 and the storage unit 30 of the vehicle instrument 1 body are connected to an external computer or the like, and the microcomputer 21 and the storage unit 30 are controlled by the external computer.

  First, as in the case of the master sample, the reference light source device 50 is applied to the casing 11 of the vehicle meter 1 body so as to cover the transmission part 15 of the vehicle meter 1 body (see FIG. 6). Next, an external computer controls the light source unit 52 with the control content stored above, and the reference light 1 is emitted from the light emitting element of the light source unit 52, and the microcomputer 21 outputs the measurement voltage V3. It memorize | stores in the memory | storage part of a computer. Further, the light source unit 52 is controlled by the external computer with the control content stored above, and the reference light 2 is emitted from the light emitting element of the light source unit 52, and the microcomputer 21 outputs the measurement voltage V4. Is stored in the storage unit.

  Next, V1 and V3 are measurement voltages obtained when the reference light 1 is applied to the master sample body and an arbitrary vehicle instrument 1 body, and V2 and V4 are the master sample body and an arbitrary vehicle. This is a measurement voltage obtained when the reference light 2 is irradiated onto the main body of the measuring instrument 1. Then, by comparing V1 and V3 and comparing V2 and V4, the difference in performance between the master sample main body and any vehicle instrument 1 main body can be understood. Then, in consideration of the difference between V1 and V3 and the difference between V2 and V4, the content of the reference table created above is corrected, and the corrected reference table is used as a measurement voltage / duty ratio specific to the vehicle instrument 1 The correspondence table is recorded in the storage unit 30. For example, the reference table is corrected so that the curve X is shifted in the x-axis direction while keeping the shape substantially unchanged by the difference between V1 and V3 or the difference between V2 and V4. Alternatively, the reference table is corrected so that the contents of the curve X are shifted in the x-axis direction by the difference between V1 and V3 and the difference between V2 and V4. The measured voltage / Duty ratio correspondence table is recorded in the storage unit 30, whereby the vehicle instrument 1 is completed.

  For example, as shown in FIG. 4, when V3 and V4 are larger by a predetermined amount than V1 and V2, respectively, as shown in FIG. 5, the curve X is moved to the right by a predetermined amount (for example, the difference between V1 and V3). A measurement voltage / duty ratio correspondence table showing the contents of the shifted curve Y is created.

  In the present embodiment, the illuminance sensor 17 is assembled to the assembly target (the casing 11, the substrate 12, etc.) by the manufacturing process as described above, and the illuminance sensor 17 assembled to the assembly target in the assembly step is used as the reference light ( A measurement step of illuminating with reference light 1 and reference light 2) and measuring the illuminance of the reference light using the illuminance sensor 17, measurement values (V3, V4) obtained by measurement in the measurement step, and predetermined reference values (V1, V2) are compared, and based on the comparison result, a correspondence table (measurement voltage / Duty ratio correspondence table) between the measured value of the illuminance of the external light and the control information of the illumination according to the comparison result And a writing step of writing the created correspondence table into the storage unit 30 is performed. By such a step, since the measurement voltage / Duty ratio correspondence table is recorded in the storage unit 30 for each of the vehicle instruments 1, each of the vehicle instruments 1 causes the light emitting element 13 to emit light with substantially the same illuminance. Can do. For this reason, it can suppress that the control content of illumination (light emitting element 13) changes for every instrument 1 for vehicles under the same environment. That is, even if the brightness is the same, inconveniences such as insufficient brightness in the vehicle meter 1 depending on the vehicle meter 1 are eliminated or reduced.

  In particular, the writing step corrects the content of a reference table indicating a reference relationship between a measured value of illuminance of external light and illumination control information (Duty ratio) based on the comparison result. In this step, the corrected reference table is recorded in the storage unit 30 as a correspondence table (measurement voltage / duty ratio correspondence table), so that a correspondence table for each vehicle instrument 1 can be created from the reference, and under the same environment Therefore, it can suppress that the control content of illumination changes for every instrument 1 for vehicles. In this embodiment, the measurement voltage / Duty ratio correspondence table after correcting the reference table is newly recorded in the storage unit 30. As another example of the above step, for example, a vehicle meter to be manufactured is used. A reference table for the master sample is recorded in advance in the storage unit 30 of one main body (for example, a master sample main body is separately manufactured in advance, a reference table is created for the master sample main body, and the vehicle instrument 1 main body is assembled. By using the reference table already recorded in the storage unit 30) and correcting / updating the reference table recorded in the storage unit 30 based on the comparison result, the corrected reference table ( The measurement voltage / duty ratio correspondence table) may be recorded in the storage unit 30. Even in such a case, under the same environment, it can suppress that the control content of illumination changes for every vehicle meter 1. FIG.

  The reference value is obtained by measuring the illuminance when the illuminance sensor 17 included in the master sample (master sample main body) of the assembly target and the illuminance sensor is illuminated with the reference light using the illuminance sensor 17. Since it is a value, the correspondence table of the vehicle instrument 1 can be created using the master sample, and the accuracy of the correspondence table can be improved. Thereby, it can suppress that the control content of illumination changes for every illumination control apparatus under the same environment.

  Since the reference table is the correspondence table that is referred to when the lighting control device uses the master sample, the correspondence table of the vehicle instrument 1 can be created using the master sample, and the accuracy of the correspondence table is improved. be able to. Thereby, it can suppress that the control content of illumination changes for every illumination control apparatus under the same environment.

  The control unit 20 includes a current-voltage conversion resistor (resistor R) that converts the current supplied from the illuminance sensor into a voltage, and the measured value of the illuminance of the reference light is a voltage converted by the current-voltage conversion resistor. Thus, it is possible to create a correspondence table that takes into account the variation in resistance, and it is possible to further prevent the illumination control content from being different for each illumination control device.

  Further, the illuminance of the reference light or the external light is an illuminance after the reference light or the external light is transmitted through the transmission unit 15 that transmits only a part of the light traveling toward the illuminance sensor 17. In addition, it is possible to create a correspondence table in consideration of the variation of the transmission unit 15, and it is possible to further prevent the illumination control content from being different for each illumination control device.

  The lighting control device is not limited to the vehicle meter 1. The illumination control device may not include illumination and an illuminance sensor. The illumination control device may control external illumination such as a headlight, for example. At this time, the illuminance sensor 17 is not provided in the illumination control device, but is assembled to the vehicle to be assembled. In this case, for example, the illumination control device controls the luminance of the external illumination according to the illuminance measured by the illuminance sensor. In addition, assembling means that the illuminance sensor 17 is arranged in a state where the same operation as the original operation can be performed in the product. By creating the correspondence table using the illuminance sensor 17 after assembling as described above, it is possible to prevent the illumination control content from being different for each illumination control device under the same environment. Become.

DESCRIPTION OF SYMBOLS 1 Vehicle instrument 11 Case 12 Board | substrate 13 Light-emitting element 14 Pointer 15 Transmission part 16 Support part 17 Illuminance sensor 18 Indicator plate 20 Control part 21 Microcomputer 23 Output control part 30 Storage part 50 Reference light source device 51 Cylindrical body 52 Light source part R resistance

Claims (6)

A storage unit that stores a correspondence table between the measurement value of the illuminance of the external light and the control information of the illumination, and the illumination control information corresponding to the measurement value obtained by measuring the illuminance of the external light using the illuminance sensor Is obtained by referring to the correspondence table stored in the storage unit, and a control unit that controls the illumination based on the acquired control information of the illumination, and a manufacturing method of an illumination control device comprising:
An assembling step of assembling the illuminance sensor to an assembling target;
A measurement step of illuminating the illuminance sensor assembled to the assembly target in the assembly step with reference light, and measuring the illuminance of the reference light using the illuminance sensor;
The measurement value obtained by measurement in the measurement step is compared with a predetermined reference value, and based on the comparison result, the measured value of the illuminance of the external light and the illumination control information according to the comparison result And a writing step of writing the created correspondence table in the storage unit as the correspondence table;
The manufacturing method of the illumination control apparatus characterized by the above-mentioned. The writing step corrects the content of a reference table indicating a reference relationship between a measured value of illuminance of external light and illumination control information based on the comparison result, and the corrected reference table is displayed. Record in the storage unit as the correspondence table;
The manufacturing method of the illumination control apparatus of Claim 1 characterized by the above-mentioned. The reference value is a measurement value obtained by measuring the illuminance when the illuminance sensor included in the master sample for the assembly target and the illuminance sensor is illuminated with the reference light, using the illuminance sensor.
The manufacturing method of the illumination control apparatus of Claim 1 or 2 characterized by the above-mentioned. The reference table is the correspondence table that is referred to when the lighting control device uses the master sample.
The manufacturing method of the illumination control apparatus of Claim 2 or 3 characterized by the above-mentioned. The control unit includes a current-voltage conversion resistor that converts a current supplied from the illuminance sensor into a voltage,
The measurement value of the illuminance of the reference light is the voltage converted by the current-voltage conversion resistor.
The manufacturing method of the illumination control apparatus of any one of Claims 1 thru | or 4 characterized by the above-mentioned. The illuminance of the reference light or the external light is an illuminance after the reference light or the external light is transmitted through a transmission part that transmits only a part of the light traveling toward the illuminance sensor. ,
The manufacturing method of the illumination control apparatus of any one of Claims 1 thru | or 5 characterized by the above-mentioned.

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