JP2021060558A - Illumination device and control method thereof, and program - Google Patents

Abstract

To provide an illumination device capable of properly controlling the temperature rise of an optical panel during continuous light emission, a control method thereof, and a program.SOLUTION: A stroboscopic device 100 includes: an optical panel 111 that is held so as to change the relative position with a discharge tube 104, and to change the light distribution angle of light from the discharge tube 104 according to its relative position; and a cooling unit 117 that cools the optical panel 111 heated by the discharge tube 104. The operating output of the cooling unit 117 is controlled based on control temperature Tf, which is the relative temperature of the optical panel 111 calculated based on the relative position, the light source emission, and the heat transfer caused by the drive of the cooling unit.SELECTED DRAWING: Figure 5

Description

The present invention relates to a lighting device and its control method and program, and more particularly to a lighting device including a cooling unit and its control method and program.

Conventionally, the lighting device is provided with a cooling unit that limits the temperature rise of the optical panel arranged in front of the lighting device, which occurs during continuous light emission by the light emitting unit, to a range in which the optical panel can be safely used.

However, since the temperature of the light emitting unit changes greatly depending on the driving state of the cooling unit, it is not possible to limit the temperature rise of the optical panel depending on the driving state of the cooling unit, and the optical panel may not be used safely. Was there.

In order to solve such a problem, for example, in Patent Document 1 in which a blower unit is installed in the lighting device as a cooling unit, the amount of air blown by the blower unit is adjusted based on the distance between the light emitting unit and the optical panel.

Japanese Patent No. 6330544

However, the temperature rise curve of the optical panel at the time of continuous light emission is not determined only by the distance between the light emitting unit and the optical panel. Therefore, if the amount of air blown by the blower unit is reduced when the light emitting unit and the optical panel are separated as in Patent Document 1, the optical panel can safely use the temperature rise and rise of the optical panel during continuous light emission. It may not be possible to limit the range that can be done.

Therefore, an object of the present invention is to provide a lighting device capable of appropriately controlling the temperature rise of the optical panel during continuous light emission, a control method thereof, and a program.

The lighting device according to claim 1 of the present invention includes an optical panel in which the relative positions of the light source and the light source are held in a changeable manner and the light distribution angle of light from the light source is changed according to the relative position. An illuminating device including a cooling unit that cools the optical panel heated by the light source, and is relative to the optical panel based on the relative position, light emission of the light source, and heat transfer generated by driving the cooling unit. It is characterized by including a calculation means for calculating a control temperature, which is a temperature, and a control means for controlling the operation output of the cooling unit based on the control temperature.

According to the present invention, it is possible to appropriately control the temperature rise of the optical panel during continuous light emission.

It is a block diagram which shows the schematic structure of the strobe device as a lighting device which concerns on 1st Embodiment of this invention. It is a figure which shows the schematic cross section of the strobe apparatus of FIG. It is a flowchart of the light emission processing which concerns on 1st Embodiment of this invention in a strobe apparatus. It is a flowchart of the state confirmation process of step S302 of FIG. It is a flowchart of the continuous light emission control processing of step S311 of FIG. It is a flowchart of the state determination process of step S503 of FIG. It is a flowchart of the light emission energy NL calculation process of step S504 of FIG. It is a figure which shows the heat transfer model of the light emitting part in FIG. It is a flowchart of the control step determination process of step S509 of FIG. It is a flowchart of the zoom position change process of step S514 of FIG. FIG. 5 is a flowchart of a cooling unit drive control process executed every time the control temperature Tf is calculated in step S508 of FIG. It is a graph which shows the measured temperature value of the optical panel in FIG. 2 and the assumed panel temperature. It is a block diagram which shows the schematic structure of the strobe device as a lighting device which concerns on 2nd Embodiment of this invention. It is a flowchart of the control parameter determination process which concerns on 2nd Embodiment of this invention. It is a continuation of FIG. 14A.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(First Embodiment)
FIG. 1 is a block diagram showing a schematic configuration of a strobe device 100 as a lighting device according to a first embodiment of the present invention. FIG. 2 is a diagram showing a schematic cross section of the strobe device 100. The same components are designated by the same reference numerals in FIGS. 1 and 2.

First, the configuration of the strobe device 100 will be described. As shown in FIG. 2, the strobe device 100 has a main body 100a that is detachably attached to a camera body (not shown) and a light emitting unit that is rotatably held in the vertical and horizontal directions with respect to the main body 100a. It is composed of 100b. In the present embodiment, the rotation direction of the light emitting unit 100b is defined with the side of the main body 100a connected to the light emitting unit 100b as the upper side.

The microcomputer FPU (hereinafter, strobe microcomputer) 101 controls each part of the strobe device 100. The strobe microcomputer 101 is a one-chip IC circuit having a built-in microcomputer including, for example, a CPU, ROM, RAM, an input / output control circuit (I / O control circuit), a multiplexer, a timer circuit, an EEPROM, an A / D, and a D / A converter. It is composed.

The battery 200 functions as a power source (VBAT) for the strobe device 100.

As shown in FIG. 1, the booster circuit block 102 includes a booster unit 102a, resistors 102b and 102c used for voltage detection, and a main capacitor 102d. The booster circuit block 102 boosts the voltage of the battery 200 to several hundred volts by the booster 102a to charge the main capacitor 102d with electric energy for light emission.

The charging voltage of the main capacitor 102d is divided by the resistors 102b and 102c, and the divided voltage is input to the A / D conversion terminal MCV_AD of the strobe microcomputer 101.

The trigger circuit 103 applies a pulse voltage to the discharge tube 104 for exciting the discharge tube 104, which will be described later.

The light emission control circuit 105 controls the start and stop of light emission of the discharge tube 104.

When the discharge tube 104 (light source) receives a pulse voltage of several KV applied from the trigger circuit 103, it excites and emits light using the electric energy charged in the main capacitor 102d.

The photodiode 106 is a sensor that receives light emitted from the discharge tube 104, and receives light emitted from the discharge tube 104 directly or via glass fiber or the like.

The integrating circuit 107 integrates the received current of the photodiode 106, and its output is input to the inverting input terminal of the comparator 108 and the A / D converter terminal INT_AD of the strobe microcomputer 101. The non-inverting input terminal of the comparator 108 is connected to the D / A converter terminal INT_DAC in the strobe microcomputer 101, and the output of the comparator 108 is connected to the input terminal of the AND gate 109. The other input of the AND gate 109 is connected to the light emission control terminal FL_START of the strobe microcomputer 101, and the output of the AND gate 109 is input to the light emission control circuit 105.

The reflecting umbrella 110 reflects the light emitted from the discharge tube 104 and guides it in a predetermined direction.

The optical panel 111 is included in a zoom optical system (not shown), and is held so that the relative position (zoom position) with respect to the reflecting umbrella unit 112 including the discharge tube 104 and the reflecting umbrella 110 can be changed. By changing the relative positions of the reflecting umbrella unit 112 and the optical panel 111 in this way, the guide number (light distribution angle of light from the discharge tube 104) of the strobe device 100 can be changed.

The light emitting portion 100b is mainly composed of a discharge tube 104, a reflecting umbrella 110, and an optical panel 111, and the irradiation direction thereof changes by rotation from the main body portion 100a.

The input unit 113 includes a power switch, a mode setting switch for setting the operation mode of the strobe device 100 including the drive setting of the cooling unit 117 described later according to the user operation, a setting button for setting various other parameters according to the user operation, and the like. including. The strobe microcomputer 101 executes various processes according to the input to the input unit 113.

The display unit 114 has a liquid crystal device and a light emitting element, and displays each state of the strobe device 100.

The zoom drive circuit 115 includes a zoom detection unit 115a that detects information about the relative positions of the reflector unit 112 and the optical panel 111 by an encoder or the like, and a zoom drive unit 115b that includes a motor for moving the reflector unit 112. .. The amount of movement of the reflecting umbrella unit 112 by the zoom driving unit 115b is calculated by the strobe microcomputer 101 based on the focal length information of the photographing lens obtained through the camera body.

The terminal 116 includes a terminal SCLK_S for synchronizing communication between the camera body and the strobe device 100, a terminal MOSI_S for transmitting data from the camera body to the strobe device 100, and a terminal MISO_S for receiving data transmitted from the strobe device 100. .. The terminal 116 also includes a GND terminal that connects both the camera body and the strobe device 100.

The cooling unit 117 is a module having a fan for cooling the optical panel 111, and is connected to the terminal FAN_PWM and the terminal FAN_FG of the strobe microcomputer 101. The cooling unit 117 can change the rotation speed of the fan by PWM control from the strobe microcomputer 101 to change the output air volume. Further, by feeding back the rotation speed information to the strobe microcomputer 101, it is possible to maintain the rotation speed as instructed to rotate.

Next, the light emission processing according to the present embodiment in the strobe device 100 will be described with reference to FIG. This process is executed by the CPU included in the strobe microcomputer 101 reading a program held in the ROM also included in the strobe microcomputer 101.

When the power switch included in the input unit 113 is turned on and the strobe microcomputer 101 of the strobe device 100 can operate, the strobe microcomputer 101 starts the light emitting process shown in the flowchart of FIG.

In step S301, the strobe microcomputer 101 initializes its own memory and port. Further, the state of the switch included in the input unit 113 and the preset input information are read, various light emission modes such as how to determine the light emission amount and the light emission timing are set, and the process proceeds to step S302.

In step S302, the strobe microcomputer 101 performs a state confirmation process for confirming the state of the hardware (hereinafter, referred to as the target hardware) related to the continuous light emission control process of FIG. 5, which will be described later. After that, the confirmed state result is stored in the RAM of the strobe microcomputer 101, and the process proceeds to step S303. The details of the state confirmation process will be described later using the flowchart of FIG.

In step S303, the strobe microcomputer 101 causes the booster circuit block 102 to start its operation to charge the main capacitor 102d. After starting charging of the main capacitor 102d, the process proceeds to step S304.

In step S304, the strobe microcomputer 101 acquires the focal length information of the photographing lens from the camera body via the terminal 116, stores the acquired focal length information in the RAM included in the strobe microcomputer 101, and then proceeds to step S305. .. If the focal length information is already stored in the RAM, the focal length information of the RAM is updated with the focal length information newly acquired in step S304.

In step S305, the strobe microcomputer 101 moves the reflecting umbrella unit 112 to the zoom drive circuit 115 so that the light distribution angle of the strobe light falls within the range corresponding to the focal length information acquired in step S304, and then steps S306. Move to. If it is not necessary to move the reflective umbrella unit 112, the process proceeds to step S306 as it is.

In step S306, the strobe microcomputer 101 displays an image related to the light emitting mode set in the input unit 113 in step S301, an image related to the focal length information acquired in step S304, and the like on the display unit 114. Further, when it is detected in the state confirmation process of step S302 that an error state has occurred in any of the hardware related to the continuous light emission process, a warning is displayed according to the error content. After that, the process proceeds to step S307.

In step S307, the strobe microcomputer 101 confirms whether or not the charging of the main capacitor 102d is completed based on the voltage input to the A / D conversion terminal MCV_AD. If charging is completed, the strobe microcomputer 101 transmits a charging completion signal to the camera microcomputer (not shown) of the camera body via the terminal 116, and proceeds to step S308. If charging is not completed, the strobe microcomputer 101 proceeds to step S302. Return.

In step S308, the strobe microcomputer 101 determines whether or not a light emission start signal has been received from the camera microcomputer as a light emission instruction, and if so, proceeds to step S309, and if not, returns to step S302.

In step S309, the strobe microcomputer 101 gives a light emission instruction to the light emission control circuit 105 according to the received light emission start signal, and the light emission control circuit 105 causes the discharge tube 104 to emit light according to the light emission instruction. After the light emission is completed, information related to light emission such as voltage information of the main capacitor 102d is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S310. Regarding a series of light emission such as pre-light emission for dimming and main light emission, the process proceeds to step S310 after the series of light emission is completed in step S309.

In step S310, it is determined whether the light emission in step S309 is the first light emission, that is, the first light emission after the start of the light emission process of FIG. If it is the first light emission, the process proceeds to step S311, and if it is the second or subsequent light emission, the process returns to step S302.

In step S311 the strobe microcomputer 101 starts a continuous light emission control process for controlling light emission and charging so that heat is not excessively generated even if heat due to light emission is continuously applied by continuous light emission or the like. The details of the continuous light emission control process will be described later using the flowchart of FIG. If the control temperature Tf and other calculation results described later are not in the initial state, the continuous light emission control process repeats the calculation and ends when the calculation result returns to the initial state. That is, the calculation of the assumed temperature of the optical panel 111, which is the target portion to be protected from the influence of heat generated by the light emission in step S309, or the counter as an alternative thereof is started from the time when the first light emission occurs. Then, the continuous light emission control process of FIG. 5 is continued in parallel with the light emission process of FIG. 3 until the heat dissipation time elapses until the calculation result becomes the same as the initial state or the reset is performed. Therefore, although the process of FIG. 5 is the continuous light emission control process in the present embodiment, the same process may be performed for the control of single light emission. After starting the continuous light emission control process in this way, the process returns to step S302. Further, every time the control temperature Tf described later is calculated by the continuous light emission control process, the cooling unit drive control process is executed in order to effectively protect the optical panel 111 from the heat from the discharge tube 104. The details of the cooling unit drive control process will be described later with reference to the flowchart of FIG.

Next, the state confirmation process (step S302) in the strobe device 100 will be described with reference to the flowchart of FIG.

This process starts when the hardware (target hardware) related to the continuous light emission control process is detected. The target hardware refers to a member that affects an optical system or a heat source. Specific examples thereof include a cooling unit 117 for cooling the optical panel 111, and optical accessories (not shown) such as a color filter and a bounce adapter attached to the front of the optical panel 111. Further, the target hardware may include an external power source (not shown) for accelerating the charging of the main capacitor 102d, a modeling LED (not shown) for making it easy to grasp the optical axis of the light emitted from the optical panel 111, and the like.

In step S401, the strobe microcomputer 101 acquires the state information of the target hardware. The state information includes information indicating whether or not each of the target hardware is mounted / connected to the strobe device 100, an operation enable / disable setting by the input unit 113, and the like. The status information is updated every time the status of the target hardware is changed, together with the error information described later. The acquired state information of the target hardware related to the continuous light emission control process is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S402.

In step S402, the strobe microcomputer 101 detects whether or not the target hardware itself is in an error state based on the state information of the target hardware acquired in step S401. For example, although the cooling unit 117 is connected to the strobe device 100 and the cooling unit 117 is operable in the light emission mode setting performed in step S301, the cooling unit 117 operates due to a failure or the like. It may not be possible. In this case, it is detected that the cooling unit 117 itself, which is the target hardware, is in an error state. If the target hardware itself is in an error state as a result of the detection, information indicating that fact is acquired as error information in the RAM included in the strobe microcomputer 101, and the process proceeds to step S403.

In step S403, the strobe microcomputer 101 stores the information acquired in steps S401 and S402 in the RAM included in the strobe microcomputer 101, and ends this process.

Next, the continuous light emission control process (step S311) in the strobe device 100 will be described with reference to the flowchart of FIG.

This process limits the protection of the light emitting unit 100b, particularly the optical panel 111, from the influence of heat generated by the light emission of the discharge tube 104. Specifically, a numerical value capable of relatively evaluating the temperature of the optical panel 111 is calculated as the assumed panel temperature, and the light emission interval, charging current, and the like are controlled based on the calculation result.

When the discharge tube 104 emits light for the first time in step S309 of FIG. 3, the strobe microcomputer 101 starts this process in parallel with the light emission process of FIG.

In step S501, the strobe microcomputer 101 initializes the settings related to continuous flash control. The input information and parameters set in advance are read, and the process proceeds to step S502. If the reading has already been performed in step S301 of FIG. 3, this step can be omitted.

In step S502, the strobe microcomputer 101 starts sampling for controlling continuous light emission. Every time a predetermined sampling time elapses, the operations of steps S503 to S512, which will be described later, are performed. In the following description, the calculation in one sampling will be described, and the calculation will be repeated every time a predetermined sampling time elapses until the heat dissipation time elapses until the calculation result becomes the same as the initial state or the reset is performed. After starting sampling, the process proceeds to step S503.

In step S503, the strobe microcomputer 101 performs a state determination process for setting calculation parameters. The details of the state determination process will be described later using the flowchart of FIG. After setting the calculation parameters in the state determination process, the result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S504.

In step S504, the strobe microcomputer 101 performs a light emission energy NL calculation process for calculating the light emission energy NL emitted during the main sampling. The light emission energy NL is calculated based on the voltage information of the main capacitor 102d, the light emission value information of the discharge tube 104 obtained from the photodiode 106, the light emission command information from the camera body, and the like. The details of the light emission energy NL calculation process will be described later using the flowchart of FIG. After calculating the light emission energy NL, it is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S505.

In step S505, the strobe microcomputer 101 calculates the control temperature addition amount Tfu. The control temperature addition amount Tfu will be described later. After calculating the control temperature addition amount Tfu, the calculation result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S506.

In step S506, the strobe microcomputer 101 calculates the control elapsed temperature Tfd. The controlled elapsed temperature Tfd will be described later. After calculating the control elapsed temperature Tfd, the calculation result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S507.

In step S507, the strobe microcomputer 101 calculates the control temperature subtraction amount Tfa. The control temperature subtraction amount Tfa will be described later. After calculating the control temperature subtraction amount Tfa, the calculation result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S508.

In step S508, the strobe microcomputer 101 calculates the control temperature Tf. The control temperature Tf will be described later. After calculating the control temperature Tf, the calculation result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S509. The cooling unit drive control process (FIG. 11) is executed every time the control temperature Tf is calculated in step S508.

In step S509, the strobe microcomputer 101 performs the control stage determination process. The control stage is a stage for setting the shortest light emission interval when continuous light emission is performed in the strobe device 100, and a plurality of stages including a warning stage, which is the highest control stage, are provided. The shortest emission interval is set to increase as the control stage rises. The details of the control stage determination process will be described later using the flowchart of FIG. After the control stage determination process, the determination result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S510.

In step S510, the strobe microcomputer 101 calculates the panel temperature counter Cp. The panel temperature counter Cp will be described later. After calculating the panel temperature counter Cp, the calculation result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S511.

In step S511, the strobe microcomputer 101 calculates the internal temperature counter Ci. The internal temperature counter Ci will be described later. After calculating the internal temperature counter Ci, the calculation result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S512.

In step S512, the strobe microcomputer 101 calculates the internal cooling amount Fi. The internal cooling amount Fi will be described later. After calculating the internal cooling amount Fi, the calculation result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S513.

In step S513, the strobe microcomputer 101 compares the zoom position at the time of the last light emission in the main sampling with the zoom position at the time of the previous sampling. If there is no change as a result of the comparison, the process proceeds to step S515. At the time of the previous sampling, if the zoom position change process of step S514 is executed and a bit indicating that the zoom position has been changed is set, this is lowered. On the other hand, if there is a change as a result of the comparison in step S513, the process proceeds to step S514.

In step S514, the strobe microcomputer 101 performs a zoom position change process. The details of the zoom position change process will be described later using the flowchart of FIG. After the zoom position change process, the result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S515.

In step S515, the strobe microcomputer 101 stores various calculation results and light emission energy-NL in the RAM included in the strobe microcomputer 101, and then proceeds to step S516. This step may be skipped if they are already stored in RAM.

In step S516, the strobe microcomputer 101 confirms whether or not the control temperature Tf and other calculation results have returned to the initial state set in step S501. If it has returned to the initial state, it proceeds to step S517, and if it is not in the initial state, it returns to step S503 and starts the next sampling.

In step S517, the strobe microcomputer 101 ends the sampling started in step S502, and ends this process.

Next, the state determination process (step S503) will be described with reference to the flowchart of FIG.

The state determination process determines the state based on the information stored in the state confirmation process of FIG. 4 described above.

In step S601, the strobe microcomputer 101 determines whether or not it has the cooling unit 117. If the cooling unit 117 is provided, the process proceeds to step S602, and if the cooling unit 117 is not provided, the process proceeds to step S607.

In step S602, the strobe microcomputer 101 determines whether the cooling unit 117 can be driven or cannot be driven. The driveable state is a state in which driving of the cooling unit 117 is permitted by the drive setting of the cooling unit 117 by the input unit 113. Further, the non-driving state means that the driving of the cooling unit 117 is prohibited by the drive setting of the cooling unit 117 by the input unit 113, or the cooling unit 117 becomes an error state in step S402 due to a failure of the cooling unit 117 or the like. It is in the state where it is detected. If it is in a driveable state, the process proceeds to step S603, and if it is in a non-driveable state, the process proceeds to step S604.

In step S603, the strobe microcomputer 101 determines whether or not an external power source has been detected and whether or not there is a response from the external power source. Since the continuous charging performance differs depending on the external power supply, the purpose is to optimize the continuous charging performance according to the charging performance and to protect the external power supply that does not correspond to the identification response. As a result of the determination in step S603, if the external power supply is detected and there is a response, the process proceeds to step S605, and if the external power supply is detected, but there is no response, the INDEX: 2 bit is set (step S608a). The process proceeds to step S609. If the external power supply is not detected, the process proceeds to step S606. The strobe microcomputer 101 sets the number of possible flashes indicating the number of flashes of the discharge tube 104 from the start of continuous flash to the warning stage described later, according to the value of the INDEX. Further, the strobe microcomputer 101 switches the shortest flash interval at a timing set according to the value of the INDEX (setting / switching means).

In step S604, the strobe microcomputer 101 determines whether or not an external power supply is attached. Unlike the case of step S603, it is not determined whether or not there is a response from the external power supply. The reason for this is that the cooling unit 117 is determined to be in a non-driving state (NO in step S602), and cooling by the cooling unit 117 cannot be used. Therefore, it is necessary to set a small number of light emission in the first place. Therefore, it is possible to protect the external power supply by further reducing the number of times that the light can be emitted to the extent that it is not necessary to determine whether or not there is a response from the external power supply. If the external power supply corresponds to the identification response, the same determination as in step S603 is performed. As a result of the determination in step S604, if the external power supply is installed, the bit of INDEX: 7 is set (step S608f), the process proceeds to step S609, and if not installed, the process proceeds to step S607.

In step S605, step S606, and step S607, the strobe microcomputer 101 determines whether or not the optical accessory is attached. As a result of the determination in step S605, if it is mounted, a bit of INDEX: 4 is set (step S608b). Further, as a result of the determination in step S606, if it is mounted, a bit of INDEX: 3 is set (step S608d). Similarly, as a result of the determination in step S607, if it is mounted, a bit of INDEX: 6 is set (step S608 g). After that, the process proceeds to step S609, respectively. On the other hand, as a result of the determination in step S605, if it is not mounted, a bit of INDEX: 1 is set (step S608c). Further, as a result of the determination in step S606, if it is not mounted, a bit of INDEX: 0 is set (step S608e). Similarly, as a result of the determination in step S607, if it is not mounted, a bit of INDEX: 5 is set (step S608h). After that, the process proceeds to step S609, respectively.

In step S609, the strobe microcomputer 101 sets the calculation parameter associated with the INDEX in which the bit is set. If it has already been set, the calculation parameter is updated.

In the present embodiment, the strobe device 100 is equipped with the cooling unit 117 as shown in FIG. 1, and the drive is permitted in the setting from the input unit 113 (YES in step S601, YES in step S602). Further, the strobe device 100 can be equipped with an external power supply and an optical accessory, but is not equipped with an external power supply and an optical accessory (no detection in step S603, NO in step S606). Therefore, the strobe microcomputer 101 proceeds to step S608e and sets a bit of INDEX: 0. Therefore, in the strobe device 100 of the present embodiment, the number of times the flash can be fired is set with energy equivalent to full flash in step S609. Since the degree of temperature rise of the light emitting unit 100b also changes, the calculation parameters of the conversion gain CS described later, which affect the switching timing of the shortest light emission interval, are also set in step S609. After setting the calculation parameters in step S609, this process ends, and the process proceeds to step S504.

Next, the light emission energy NL calculation process (step S504) will be described with reference to the flowchart of FIG.

In this embodiment, the light emitting energy NL is calculated from the voltage information of the main capacitor 102d.

In step S701, the strobe microcomputer 101 acquires the information of the pre-flash voltage bVCM from the A / D conversion value of the main capacitor 102d. After acquiring the pre-emission voltage bVCM, the process proceeds to step S702.

In step S702, the strobe microcomputer 101 acquires information on the post-flash voltage aVCM from the A / D conversion value of the main capacitor 102d. After acquiring the voltage aVCM after light emission, the process proceeds to step S703.

In step S703, the strobe microcomputer 101 calculates the electrical energy EC by using the pre-flash voltage bVCM acquired in step S701 and the post-flash voltage aVCM acquired in step S702. The electrical energy EC is calculated by the following formula.

From the equation (1), the electrical energy EC adjusts the output range with the gain Os, which is the adjustment gain on the farm, in order to convert it into a number of digits that is easy to handle in terms of control. After calculating the electrical energy EC, the process proceeds to step S704.

In step S704, the strobe microcomputer 101 calculates the light emission energy NL used in the calculation formula used in the continuous light emission control process described later by weight value conversion. The light emitting energy NL is obtained by the following approximate formula according to the configuration of the strobe device 100 and the like.

The coefficients α and β are adjusted based on the measurement data. More specifically, the coefficients α and β are adjusted based on the amount of change in the voltage of the main capacitor 102d for each amount of light emitted. After calculating the light emission energy NL, the result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S705.

In step S705, the strobe microcomputer 101 determines whether the main sampling is continuing (within the main sampling time) or finished. If the main sampling is continuing, the process returns to step S701, and if the sampling is completed, the process proceeds to step S706.

In step S706, the strobe microcomputer 101 adds up the light emitting energy NLs emitted during the main sampling time, and updates the light emitting energy NL. When there are multiple (z) times of light emission within this sampling time, assuming that the respective light emission energies calculated in step S704 are NL1, NL2, ..., NLz, the updated light emission energy NL is the following equation. Is sought after.

In step S309, the pre-emission and the main emission are treated as a series of emission, but in the calculation of the emission energy NL, the pre-emission is also regarded as individual emission and is added up using the equation (3). If no light is emitted within the sampling time, the value of the light emission energy NL added up in step S706 becomes 0. After updating the light emitting energy NL, the result is stored in the RAM included in the strobe microcomputer 101, the light emitting energy NL calculation process is completed, and the process proceeds to step S505.

Next, various arithmetic expressions (steps S505 to step S508 and steps S510 to S512) used in the continuous light emission control process of FIG. 5 will be described with reference to FIG.

FIG. 8 is a diagram showing a heat transfer model of the light emitting unit 100b. FIG. 8A is a diagram showing heat radiation to the optical panel 111 when the discharge tube 104 emits light. FIG. 8B is a diagram showing heat transfer from the internal space of the heated light emitting unit 100b to the optical panel 111 after the discharge tube 104 emits light. FIG. 8C is a diagram showing heat transfer when heat is dissipated from the heated optical panel 111 to the external space after the discharge tube 104 emits light. FIG. 8D is a diagram showing heat transfer when the optical panel 111 heated by the light emission of the discharge tube 104 dissipates heat by blowing air from the cooling unit 117. FIG. 8E is a diagram showing heat transfer to the internal space of the light emitting unit 100b when the discharge tube 104 emits light. FIG. 8 (f) is a diagram showing heat transfer when heat is dissipated from the internal space of the heated light emitting unit 100b to the external space through the outer shell.

First, as shown in FIG. 8A, the optical panel 111 is heated by the heat radiation when the discharge tube 104 emits light. Assuming that this amount of heat is the amount of radiant heating Rh, the following equation is obtained using the above-mentioned light emitting energy NL.

Rhc indicates the radiant heating coefficient. Since the optical panel 111 has a different effect of heat radiation from the effective range of the optical panel and the discharge tube 104 for each zoom position, the radiant heating amount Rh is obtained by setting the radiant heating coefficient Rhc for each zoom position.

As shown in FIG. 8B, after the discharge tube 104 emits light, heat transfer occurs from the heated internal space of the light emitting unit 100b to the optical panel 111 with a time lag from the time when the above-mentioned heat radiation occurs. .. Assuming that this is the heat transfer heating amount Hh, it can be obtained by the following formula.

Ci indicates an internal temperature counter, and Cp indicates a panel temperature counter. The prefix pre indicates the result calculated in the sampling time one or more before. Hhc indicates the heat transfer coefficient when the heat in the internal space of the light emitting unit 100b is transferred to the optical panel 111.

As shown in FIG. 8C, the optical panel 111 is heated and at the same time dissipates heat. Assuming that the amount of heat radiated from the optical panel 111 to the outside is the amount of heat radiated from the panel Fp, it can be obtained by the following equation.

T indicates the ambient temperature or an alternative counter, and Fhc indicates the heat transfer coefficient when heat is dissipated from the optical panel 111.

As shown in FIG. 8D, the optical panel 111 is cooled by blowing air from the cooling unit 117. Assuming that the amount of heat for which the optical panel 111 is forcibly cooled by the cooling unit 117 is the amount of heat for forced cooling Ap, it can be obtained by the following formula.

Af indicates the cooling flow rate, Dt indicates the operating output, and Afc indicates the conversion coefficient.

Originally, in addition to the above, heat conduction with the outer shell is also included, but since the contact area is small and the heat transfer when the discharge tube 104 emits light is sufficiently small, it is omitted in the present embodiment.

Next, the internal temperature counter Ci represented by the equation (5) is obtained.

As shown in FIG. 8E, the internal space of the light emitting unit 100b is heated by heat transfer when the discharge tube 104 emits light. Assuming that this calorific value is the calorific value Hv, the following equation is obtained using the light emitting energy NL.

Cic indicates the internal temperature coefficient, which is the conversion coefficient from the light emission energy NL to the calorific value Hv. CS indicates a conversion gain, and has a function of adjusting a deviation at the time of conversion to a calorific value Hv that changes depending on the temperature of the internal space of the light emitting unit 100b.

As shown in FIG. 8 (f), the internal space of the heated light emitting unit 100b dissipates heat. Assuming that the amount of heat radiated to the external space through the outer shell is the internal cooling amount Fi, it is calculated by the following formula.

Fic indicates the internal cooling coefficient.

The internal temperature counter Ci represented by the formula (5) is obtained by the following formula.

Ap indicates the amount of heat of forced cooling, and Cr indicates the contribution rate of preAP to the internal temperature counter Ci.

Further, the panel temperature counter Cp represented by the equation (5) is obtained by the following equation.

Thereby, the heat transfer heating amount Hh can be obtained by the formula (5).

と表すことができる。式（１２）より、環境温度Ｔがわかれば、その時の想定パネル温度を求めることができる。本実施形態では公知の温度センサ等を用いず、コストダウンを図りながら連続発光制御を実現することを想定し、また制御の簡単化のため、Ｔ＝０として以降の演算を行う。 Next, the assumed temperature of the optical panel 111 (hereinafter referred to as the assumed panel temperature) assumed by using the panel temperature counter Cp obtained by the equation (11) and the environmental temperature T is calculated. Assuming that the assumed panel temperature is Tps,

It can be expressed as. If the environmental temperature T is known from the equation (12), the assumed panel temperature at that time can be obtained. In this embodiment, it is assumed that continuous light emission control is realized while reducing costs without using a known temperature sensor or the like, and for simplification of control, the subsequent calculations are performed with T = 0.

In order to perform the calculation related to the continuous light emission control processing, the equation (12) is expanded and arranged as follows.

となる。制御温度加算量Ｔｆｕは本サンプリングでの熱放射による光学パネル１１１の発熱を示している。制御経過温度Ｔｆｄは前回のサンプリングの演算結果から想定される本サンプリングでの光学パネル１１１の温度（想定パネル温度）を示している。制御温度減算量Ｔｆａは本サンプリングでの冷却部１１７による光学パネル１１１の冷却熱量を示している。また、制御経過温度Ｔｆｄ内には前回サンプリングのパネル温度カウンタｐｒｅＣｐと前回サンプリングの内部温度カウンタｐｒｅＣｉが含まれるため、図５のフローチャートから、以下の３式で１サンプリング内の演算を完了することができる。 Tf indicates the control temperature, which is the relative temperature of the optical panel 111, and at the same time, has the role of a light emission counter, and is used for the control determination described later. Here, assuming that the first term on the right side of the equation (13) is the control temperature addition amount Tfu, the second and third terms on the right side are the control elapsed temperature Tfd, and the fourth term on the right side is the control temperature subtraction amount Tfa.

Will be. The control temperature addition amount Tfu indicates heat generation of the optical panel 111 due to heat radiation in this sampling. The control elapsed temperature Tfd indicates the temperature (assumed panel temperature) of the optical panel 111 in the main sampling estimated from the calculation result of the previous sampling. The control temperature subtraction amount Tfa indicates the amount of heat of cooling of the optical panel 111 by the cooling unit 117 in this sampling. Further, since the panel temperature counter preCp of the previous sampling and the internal temperature counter preCi of the previous sampling are included in the control elapsed temperature Tfd, the calculation within one sampling can be completed by the following three equations from the flowchart of FIG. it can.

The above is the arithmetic expression used in the continuous light emission control process. That is, in step S505, the first equation of the equation (14), in step S506, the second equation of the equation (14), in step S507, the third equation of the equation (14), and in step S508, the fourth equation of the equation (14). The calculation is performed using the eyes. Further, the calculation is performed using the equation (15) in step S510, the equation (16) in step S511, and the equation (17) in step S512. Further, in each of the equations (15) to (17), the panel temperature counter, the internal temperature counter, and the amount of internal cooling heat to be fed back to the next sampling are calculated. This makes it possible to calculate the assumed panel temperature based on the heat dissipation time, the amount of air blown determined by the cooling flow rate Af corresponding to the operating output Dt of the cooling unit 117, and the temperature difference in the internal space of the optical panel 111 and the light emitting unit 100b. Become.

Next, the control stage determination process (step S509) during the continuous light emission control process will be described with reference to the flowchart of FIG.

In step S901, the strobe microcomputer 101 acquires the zoom position at the time of light emission in this sampling from the zoom detection unit 115a, stores the result in the RAM included in the strobe microcomputer 101, and then proceeds to step S902.

In step S902, the strobe microcomputer 101 reads a plurality of determination threshold values set corresponding to the zoom position acquired in step S901 from the RAM included in the strobe microcomputer 101, and proceeds to step S903. Here, the plurality of determination threshold values indicate the minimum temperature of each different control stage.

In step S903, the strobe microcomputer 101 determines the control stage based on the control temperature Tf obtained in step S508 and the determination threshold value read in step S902. Specifically, in order from the highest control stage, whether or not the control temperature Tf exceeds the judgment threshold is compared, and as a result of the comparison, when the control temperature Tf exceeds the judgment threshold, the judgment threshold is set to the lowest temperature. It is determined that this is the control stage. After that, the determined control step is stored in the RAM included in the strobe microcomputer 101, and then the process proceeds to step S904.

In step S904, the strobe microcomputer 101 updates from the current control stage to the control stage determined in step S903, and updates the related parameters. The shortest emission interval is changed by updating the control stage. This step may be omitted if there is no change from the current control stage. After updating the control stage, the result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S905.

In step S905, the strobe microcomputer 101 determines whether or not the control stage updated in step S904 is in the warning stage. If the control step is not updated in step S904 and the step is omitted, this step may be omitted. If it is in the warning stage, the process proceeds to step S906, and if it is not in the warning stage, the control stage determination process of FIG. 9 is terminated and the process proceeds to step S510. If the sampling time is not in the warning stage and the sampling time is updated to the determination processing time for the warning stage described later in step S906, the sampling time is returned to the sampling time set in step S502.

In step S906, the strobe microcomputer 101 updates the sampling time set in step S502 to the determination processing time for the warning stage. Here, the determination processing time is a time longer than the sampling time set in step S502. This is because when the warning display in the next step S907 is updated with the sampling time set in step S502, a phenomenon such as chattering on the display occurs, and the display is not only difficult to see, but also the user can use the strobe device 100. This is because it may be misunderstood as a failure of. After applying the determination processing time for the warning stage, the result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S907.

In step S907, the strobe microcomputer 101 (display control means) causes the display unit 114 to display a warning of the corresponding warning stage, and then ends the control stage determination process and proceeds to step S510.

Next, the zoom position change process (step S514) during the continuous light emission control process will be described with reference to the flowchart of FIG.

In step S1001, the strobe microcomputer 101 reads the determination threshold value of the control temperature Tf of the control stage determined in step S509 at the zoom position before the zoom position is changed. After reading the determination threshold value before the change, the process proceeds to step S1002.

In step S1002, the strobe microcomputer 101 reads the determination threshold value of the control temperature Tf of the control stage determined in step S509 at the zoom position after the zoom position is changed. After reading the changed determination threshold value, the process proceeds to step S1003.

In step S1003, the strobe microcomputer 101 performs conversion processing on the panel temperature counter preCp, which is the calculation result of step S510, at the ratio of the determination threshold values read in each of steps S1001 and S1002. This is because the range of the control stage is different for each zoom position. The value of the panel temperature counter Cp after conversion is obtained from the following equation from the equation (15), where the determination threshold value before conversion is FPZ and the determination threshold value after conversion is FAZ.

After the conversion process in step S1003, the calculation result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S1004.

In step S1004, similarly to step S1003, the strobe microcomputer 101 performs conversion processing on the internal temperature counter preCi, which is the calculation result of step S511, at the ratio of the determination threshold values read in each of steps S1001 and S1002.

After the conversion process in step S1004, the calculation result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S1005.

In step S1005, the strobe microcomputer 101 updates the determination threshold value before the change with the determination threshold value after the change, and stores the determination threshold value in the RAM included in the strobe microcomputer 101. As a result, the current judgment threshold value can be used as the judgment threshold value before the change in the next sampling. Also, a bit indicating that the zoom position has been changed is set. If this bit is set, the control stage determination process in step S509 is not performed. This is because feedback is performed in the continuous light emission control process, and immediately after the zoom position is changed, the control temperature Tf is calculated using the panel temperature counter Cp and the internal temperature counter Ci calculated at the previous zoom position. This is because if the control stage determination is performed at that stage, the control stage may temporarily deviate from the normal value. After storing the bits in the RAM included in the strobe microcomputer 101, the zoom position change process of FIG. 10 is completed.

Next, the cooling unit drive control process that starts in conjunction with the continuous light emission control process of FIG. 5 will be described with reference to the flowchart of FIG.

The cooling unit drive control process is a process of blowing air from the cooling unit 117 to the optical panel 111 to cool the light emitting unit 100b, particularly the optical panel 111, from the influence of heat generated by the light emitted from the discharge tube 104. .. By determining the operating output Dt at the time of blowing air based on the control temperature Tf, the operating output Dt is increased when the temperature of the optical panel 111 is high to increase the cooling efficiency, and the operating output when the temperature of the optical panel 111 is low. It enables control by lowering Dt to suppress driving noise and power consumption.

When the control temperature Tf is calculated in step S508 of FIG. 5, the strobe microcomputer 101 starts the cooling unit drive control process shown in FIG.

In step S1101, the strobe microcomputer 101 reads the result of the control temperature Tf calculated in step S508 from the RAM. After reading the control temperature Tf, the process proceeds to step S1102.

In step S1102, the strobe microcomputer 101 reads a plurality of cooling unit drive control threshold values for determining the operation output Dt of the cooling unit 117 from the RAM included in the strobe microcomputer 101, and proceeds to step S1103.

In step S1103, the strobe microcomputer 101 determines which control stage (cooling control stage) among the plurality of cooling unit drive control thresholds read in step S1102 the control temperature Tf read in step S1101. Then, the operation output Dt corresponding to the determined control stage is determined. Specifically, information indicating the value of the operation output Dt for each control stage is held in advance in the ROM of the strobe microcomputer 101, and this determination is made using the information. After determining the operation output Dt, the result of the operation output Dt is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S1104.

In step S1104, the strobe microcomputer 101 updates the drive control setting in order to drive the cooling unit 117 with the operation output Dt determined in step S1103. After updating the drive control setting, the setting result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S1105.

In step S1105, the strobe microcomputer 101 is driven by the cooling unit 117 with the operation output set in step S1104, and confirms whether or not there is an abnormality in the operation output. If there is no abnormality in the operation output, the cooling unit drive control process of FIG. 11 is terminated and the process returns to step S302, and if there is an abnormality in the operation output, the process proceeds to step S1106.

In step S1106, the strobe microcomputer 101 determines that the cooling unit 117 cannot operate normally due to a failure or the like, and stops driving the cooling unit 117. Then, the state determination process of step S503 is executed to update the INDEX that sets the bit, and the setting is updated to the calculation parameter associated with the INDEX. In the example of this embodiment, the bit set from INDEX: 0 to INDEX: 5 is updated, and the setting is updated to the operation parameter associated with INDEX: 5. After updating the setting of the calculation parameter, the cooling unit drive control process of FIG. 11 is terminated.

In step S1103, instead of the cooling unit drive control threshold value in step S1102, the operation output Dt of the cooling unit 117 may be determined based on the determination threshold value used in the control stage determination process in step S902. This makes it difficult to fine-tune the operation output Dt, but it is possible to eliminate the need for a table of cooling unit drive control threshold values, and it is possible to link the shortest emission interval and the operation output Dt for each control stage.

Next, an example in which the optical panel 111 can be effectively protected by the light emission processing of FIG. 3 described above will be described with reference to the graph of FIG.

FIG. 12 is a graph showing the actual temperature value of the optical panel 111 and the assumed panel temperature thereof. As described above, the assumed panel temperature can be obtained by the equation (12).

It shows the temperature result of the optical panel 111 when the driving of the cooling unit 117 is stopped from the input unit 113 150 seconds after the end of continuous light emission in the state where the cooling unit 117 is being driven.

In the example of FIG. 12, from the measured value shown by the dotted line, the temperature of the optical panel 111 is temporarily lowered to around 72 ° C. after the temperature of the optical panel 111 rises to around 88 ° C. by continuous light emission until the driving of the cooling unit 117 is stopped. .. However, after the cooling unit 117 is stopped, the temperature rises again to around 100 ° C. due to the heat of the internal space of the light emitting unit 100b heated by the discharge tube 104. The assumed panel temperature Tps of the equation (12) shown by the solid line is assumed by a series of processes and calculations described above for the temperature change of the optical panel 111 caused by the cooling unit 117 being stopped while being driven. Is possible. In the example of FIG. 12, when the cooling unit 117 changes from the driven state to the stopped state, the operation parameters are updated from INDEX: 0 to INDEX: 5 according to the state determination process (FIG. 6) in step S503. As a result, the number of times that light can be emitted is reduced, and the switching timing of the shortest light emission interval is accelerated. By doing so, even if the cooling unit 117 continues to emit light in the stopped state, the optical panel 111 is controlled from the heat of the discharge tube 104 by controlling the light emission based on the control temperature Tf obtained from the assumed panel temperature Tps. Can be protected. Further, when the cooling unit 117 changes from the stopped state to the driven state, the operation parameter is similarly updated from INDEX: 5 to INDEX: 0 according to the determination flow in the state determination process in step S503. As a result, the number of times that light can be emitted is increased within an appropriate range, and the switching timing of the shortest light emission interval is delayed.

As described above, various processes associated with the light emission of the strobe device 100 are executed. In the present embodiment, the strobe microcomputer 101 has been described as a one-chip IC circuit configuration with a built-in microcomputer including a CPU for executing the above-mentioned series of processes, a RAM for storing various information, and the like, but the present invention is not limited thereto. For example, a dedicated control unit, determination unit, memory, etc. that execute each of the above-mentioned series of processes may be provided. Further, although the cooling unit 117 has been described as a fan module, it may be a cooling module having an equivalent function such as a pump.

It should be noted that each flowchart described in this embodiment is merely an example, and various processes may be executed in a different order from each flowchart described in this embodiment if there is no inconvenience.

(Second embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. 13, 14A, and 14B.

Among the configurations of the strobe device 150 as the lighting device of the present embodiment, the same configurations as those of the strobe device 100 according to the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

In the present embodiment, the light emitting unit 100b further includes the modeling LED 118, and also drives the cooling unit 117 when protecting the optical panel 111 from the heat generated by the modeling LD 118. Therefore, for example, the setting condition of the operation output Dt of the cooling unit 117 is different from the first embodiment in that the setting condition exists in addition to the control temperature Tf calculated based on the heat transfer model of FIG. That is, the strobe device 150 includes a light emitting unit thermometer 119 and a control unit thermometer 120, and the temperature information detected by these can be used as a setting condition for the operation output Dt of the cooling unit 117. .. As described above, the present embodiment has a plurality of setting conditions of various control parameters including the operation output Dt of the cooling unit 117.

As described above, in the present embodiment, among the plurality of setting conditions, various control parameters are actually set in the strobe device 150 by using the setting conditions in which the set control parameters can surely protect the optical panel 111. The feature is that it is set.

FIG. 13 is a block diagram showing a schematic configuration of a strobe device 150 as a lighting device according to a second embodiment of the present invention.

The modeling LED 118 is a light projection LED used to aim the optical axis direction of the light emitted from the discharge tube 104 emitted from the optical panel 111 before the discharge tube 104 emits light. The modeling LED 118 is unitized with a dedicated small lens (not shown), and is arranged in the light emitting unit 100b at a position having an optical axis approximately equal to the optical axis of the optical panel 111. In addition, the modeling LED 118 is also provided with an LED heat radiating section (not shown) that suppresses heat generation generated when the model LED 118 is lit, and a part of the air blown from the cooling section 117 also hits the LED heat radiating section to further increase the heat dissipation effect. There is.

The light emitting unit thermometer 119 is connected to the strobe microcomputer 101 and is arranged at a position in the light emitting unit 100b so as not to block the optical path of the light from the discharge tube 104. The light emitting unit thermometer 119 detects the temperature of the light emitting unit 100b whose temperature rises due to the light emitted from the discharge tube 104. The temperature information detected by the light emitting unit thermometer 119 is transmitted to the strobe microcomputer 101 and stored in the RAM included in the strobe microcomputer 101.

The control unit thermometer 120 is connected to the strobe microcomputer 101 and is arranged in the main body unit 100a at a position where the influence of heat dissipation from the light emitting unit 100b heated by the discharge tube 104 is small. That is, the control unit thermometer 120 detects the temperature inside the main body unit 100a of the strobe device 150. The temperature information detected by the control unit thermometer 120 is transmitted to the strobe microcomputer 101 and stored in the RAM included in the strobe microcomputer 101.

Next, the control parameter determination process according to the present embodiment in the strobe device 150 will be described with reference to FIGS. 14A and 14B.

In the first embodiment, the shortest emission interval (hereinafter, the shortest emission interval Ft) is set from the control stage determined by the control stage determination process (FIG. 9). Further, the value of the operation output Dt of the cooling unit 117 is determined by the cooling unit drive control processing (FIG. 11) from the control temperature Tf calculated by the continuous light emission control processing (FIG. 11).

On the other hand, in the control parameter determination process according to the present embodiment, first, various control parameters (number of possible light emission, shortest light emission interval, operation output of cooling unit 117) under a plurality of setting conditions are obtained. After that, the values of various control parameters under the plurality of set conditions obtained are compared, and the control parameter having the greatest protective effect on the optical panel 111 is actually used in the strobe device 150. In the present embodiment, the cooling unit 117 is set to the operation output DtL under the setting condition that the modeling LED 118 is lit. Further, when the temperature of the light emitting unit 100b heated by the light emission of the discharge tube 104 or the lighting of the modeling LED 118 is set as the temperature detected by the light emitting unit thermometer 119, the cooling unit 117 is set to the operation output DtT at the same time. , Set to the shortest emission interval FtT.

In step S1401, the strobe microcomputer 101 confirms whether or not the power switch of the input unit 113 is turned on. If the power switch of the input unit 113 is ON, the process proceeds to step S1402, and if it is OFF, the process proceeds to step S1414.

In step S1402, the strobe microcomputer 101 determines whether the cooling unit 117 can be driven or cannot be driven. Since this determination is the same as the determination in step S602 of FIG. 6, details will be omitted. If it is in a driveable state, the process proceeds to step S1403, and if it is in a non-driveable state, the process proceeds to step S1414.

In step S1403, the strobe microcomputer 101 confirms whether or not the strobe device 150 is in the auto power-off state. If it is in the auto power off state, the process proceeds to step S1414, and if it is not in the auto power off state, the process proceeds to step S1404.

In step S1404, the strobe microcomputer 101 detects the temperature with the light emitting unit thermometer 119, and the operation output and the shortest light emission of the cooling unit 117 when the detected temperature information (hereinafter referred to as temperature control condition) is set as a setting condition. Calculate the interval. In the present embodiment, based on the temperature information detected by the light emitting unit thermometer 119, it is determined which temperature control stage the temperature of the light emitting unit 100b is among the plurality of temperature control thresholds, and the determined temperature control stage is supported. The operation output DtT and the shortest emission interval FtT are determined. In the present embodiment, information indicating the value of the operation output DtT and the value of the shortest emission interval FtT for each temperature control stage is stored in advance in the ROM of the strobe microcomputer 101, and this determination is made using the information. Further, it is preferable to provide the temperature control steps stepwise at the same intervals as the control steps between the cooling unit drive control thresholds shown in the first embodiment because the comparison described later becomes easy. After that, the shortest light emission interval FtT and the operation output DtT in the temperature control stage determined in the RAM included in the strobe microcomputer 101 are stored, and the process proceeds to step S1405.

In step S1405, the strobe microcomputer 101 sets the shortest light emission interval FtT and the operation output DtT of the cooling unit 117 as the control parameters in the tentative selection state based on the result determined in step S1404. Instead of the shortest emission interval FtT and the operation output DtT of the cooling unit 117, the above-determined temperature control step may be set as the control parameter in the tentative selection state. After that, the set control parameters in the temporary selection state are stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S1406.

In step S1406, the strobe microcomputer 101 performs the same processing as the continuous light emission control processing (FIG. 5) shown in the first embodiment to calculate the control temperature Tf, and the calculated control temperature Tf is 0 (zero). ) Is exceeded. When the control temperature Tf exceeds 0 (zero), the information of the control temperature Tf (hereinafter referred to as continuous light emission control condition) is tentatively determined as the setting condition, and the process proceeds to step S1407. If it is 0 (zero), step S1409 Move to. Since the control temperature Tf is defined as 0 (zero) or higher, it does not become negative.

In step S1407, the strobe microcomputer 101 is in which control stage (cooling control stage) between the plurality of cooling unit drive control thresholds where the control temperature Tf is similar to the cooling unit drive control process (FIG. 11) in the first embodiment. Judge whether or not. Then, the operation output Dt corresponding to the determined control stage is determined. Further, the shortest emission interval Ft is determined based on the control stage determined by the control stage determination process of FIG. After that, the shortest light emission interval Ft and the operation output Dt are stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S1408.

In step S1408, the strobe microcomputer 101 sets the shortest light emission interval Ft and the operation output Dt of the cooling unit 117 as the control parameters in the tentative selection state based on the result determined in step S1407. Instead of the shortest emission interval Ft and the operation output Dt of the cooling unit 117, the above-determined control step may be set to the tentative selection state. After that, the set control parameters in the temporary selection state are stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S1409.

In step S1409, the strobe microcomputer 101 confirms whether the modeling LED 118 is on or off. If it is lit, the information that the modeling LED 118 is lit (hereinafter referred to as modeling LED condition) is tentatively determined as a setting condition, and the process proceeds to step S1410. If it is off, the process proceeds to step S1411.

In step S1410, the strobe microcomputer 101 sets the operation output DtL of the cooling unit 117 under the modeling LED condition as the control parameter in the tentative selection state. After that, the set control parameters in the temporary selection state are stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S1411. The lowest temperature control stage may be temporarily selected instead of the operation output DtT of the cooling unit 117.

In step S1411, the strobe microcomputer 101 determines the control parameter that maximizes the shortest light emission interval and the operation output of the cooling unit 117 from the control parameters in the temporarily selected state in steps S1405, S1408, and S1410. That is, the values of the shortest flash interval FtT and the shortest flash interval Ft are compared, and a larger value (that is, the shortest flash interval is long) is determined as a control parameter actually set in the strobe device 150. For the cooling unit 117, the values of the operating output DtT, the operating output Dt, and the operating output DtL are compared, and the largest value (that is, the maximum air flow amount) is determined as the control parameter actually set in the strobe device 150. ..

When the temperature control stage or the control stage is set in the control parameter in the tentative selection state, it is first determined which temperature control stage the control stage set in step S1408 corresponds to. After that, the highest temperature control step among the determined temperature control step and the temperature control step set in steps S1405 and S1410 is determined as the control parameter actually set in the strobe device 150.

By doing so, the control parameters can be determined in consideration of the three setting conditions of the temperature control condition, the continuous light emission control condition, and the LED modeling condition. Therefore, even when the number of heat sources such as the modeling LED 118 increases, the optical panel 111 can be more reliably protected. After that, the determined control parameters are stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S1412. The shortest flash interval set in the strobe device 150 is updated when the control parameter is determined in step S1411, and is applied from the timing of the subsequent flash instruction.

In step S1412, the strobe microcomputer 101 determines whether or not the operation output of the cooling unit 117 determined as the control parameter in step S1411 exceeds 0 (zero). If the operating output of the cooling unit 117 exceeds 0 (zero), the process proceeds to step S1413, and if it is 0 (zero), the process proceeds to step S1414. Since the operation output is defined as 0 (zero) or more, it does not become negative (backward ventilation).

In step S1413, the strobe microcomputer 101 updates the operation output of the cooling unit 117 set in the strobe device 150 with the operation output of the cooling unit 117 determined as the control parameter in step S1411, and starts driving. After the start of driving, the process proceeds to step S1415.

In step S1414, the strobe microcomputer 101 stops driving the cooling unit 117. This step may be omitted if it has already stopped. After the drive is stopped, the process proceeds to step S1415.

In step S1415, the strobe microcomputer 101 feeds back the operation output of the cooling unit 117, and determines whether or not the strobe microcomputer 101 is driven by the operation output as set. After the determination, the determination result is stored in the RAM included in the strobe microcomputer 101, and the process proceeds to step S1416.

In step S1416, the strobe microcomputer 101 determines from the determination result in step S1415 whether or not there is an error in the operation output of the cooling unit 117 due to an operation failure such as a failure. If it is determined that there is an error, the process proceeds to step S1417, and if it is determined that there is no error, the process returns to step S1401.

In step S1417, the strobe microcomputer 101 displays a warning on the display unit 114 to the effect that the cooling unit 117 has a malfunction. After the warning is displayed, the process proceeds to step S1414, and the driving of the cooling unit 117 is stopped. This step may be omitted if it has already stopped. After the drive is stopped, the process proceeds to step S1415.

As described above, according to the control parameter determination processing shown in FIGS. 14A and 14, at least one of the shortest emission interval and the operation output of the cooling unit 117 under each of the three setting conditions of the temperature control condition, the continuous emission control condition, and the modeling LED condition. Temporarily select control parameters. After that, the shortest emission interval and the operation output of the cooling unit, which are the maximum among the tentatively selected control parameters, are determined as control parameters. As a result, the optical panel 111 heated by the light emission of the discharge tube 104 can be reliably protected.

Further, the number of times that light can be emitted under the above three setting conditions may be determined by the same method as other control parameters so that the temporary selection state can be obtained. In this case, the smallest number of light emission possible times among the temporarily selected light emission possible times in each setting condition is determined as a control parameter. As a result, the optical panel 111 heated by the light emission of the discharge tube 104 can be reliably protected.

In the flowcharts of FIGS. 14A and 14B, the temperature information detected by the light emitting unit thermometer 119 is used only when tentatively determining the temperature control condition in step S1404, but the control temperature in step S1406 is used. It may be used to calculate Tf.

An example in which the temperature information detected by the light emitting unit thermometer 119 is used for calculating the control temperature Tf will be described with reference to the flowchart of FIG.

In step S511, the strobe microcomputer 101 calculates the internal temperature counter Ci based on the temperature information detected by the light emitting unit thermometer 119. Assuming that the temperature Ti is detected by the light emitting unit thermometer 119, the internal temperature counter Ci can be converted by the following equation.

The coefficients σ and τ differ depending on the configuration of the strobe device 150 and the like, and are adjusted based on the measurement data.

Further, by using the equation (12) and the temperature detected by the control unit thermometer 120 as a substitute for the environmental temperature T, it is possible to obtain the assumed panel temperature Tps. As a result, in the first embodiment, the control temperature Tf is calculated with T = 0 for simplification of control, whereas in the present embodiment, the control temperature Tf corrected by the environmental temperature T can be calculated. It becomes.

With respect to other points, the continuous light emission control process is performed in the same manner as in the first embodiment, and the control temperature Tf is calculated in step S1406.

As described above, in the present embodiment, there are a plurality of setting conditions for various control parameters (number of possible flashes, shortest flash interval, operation output of the cooling unit 117) of the strobe device 150, and one of the setting conditions is used. The set control parameters are set in the strobe device 150.

It should be noted that each flowchart described in this embodiment is merely an example, and various processes may be executed in a different order from each flowchart described in this embodiment if there is no inconvenience.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

[Other Embodiments]
Needless to say, the object of the present invention is also achieved by supplying the device with a storage medium in which the program code of the software that realizes the functions of the above-described embodiment is recorded. At this time, the computer (or CPU or MPU) including the control unit of the supplied device reads and executes the program code stored in the storage medium.

In this case, the program code itself read from the storage medium realizes the function of the above-described embodiment, and the program code itself and the storage medium storing the program code constitute the present invention.

As the storage medium for supplying the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a non-volatile memory card, a ROM, or the like can be used.

Further, based on the instruction of the above-mentioned program code, the OS (basic system or operating system) running on the device performs a part or all of the processing, and the processing realizes the function of the above-described embodiment. Needless to say, cases are also included.

Further, the program code read from the storage medium may be written in the memory provided in the function expansion board inserted in the device or the function expansion unit connected to the computer to realize the functions of the above-described embodiment. Needless to say, it is included. At this time, based on the instruction of the program code, the function expansion board, the CPU provided in the function expansion unit, or the like performs a part or all of the actual processing.

100 Strobe device 100a Main unit 100b Light emitting unit 101 Strobe microcomputer 104 Discharge tube 111 Optical panel 113 Input unit 114 Display unit 117 Cooling unit 118 Modeling LED
119 Light emitting part thermometer

Claims (11)

The optical panel in which the relative positions of the light source and the light source are held changeably and the light distribution angle of the light from the light source is changed according to the relative position and the optical panel heated by the light source are cooled. A lighting device equipped with a cooling unit
A calculation means for calculating the control temperature, which is the relative temperature of the optical panel, based on the relative position, the light emission of the light source, and the heat transfer generated by driving the cooling unit.
A lighting device including a control means for controlling an operation output of the cooling unit based on the control temperature. Setting / switching means for setting the number of times the light source can emit light during continuous light emission and switching the shortest light emission interval at a set timing.
A detection means for detecting whether the cooling unit can be driven or the cooling unit cannot be driven.
Further provided with a setting means for setting calculation parameters used when calculating the control temperature by the calculation means based on the number of times of light emission and the set timing.
When the state detected by the detection means changes from the driveable state to the non-driveable state, the setting / switching means reduces the number of times the light can be emitted and advances the set timing. The lighting device according to claim 1. When the state detected by the detection means changes from the non-driveable state to the driveable state, the switching means increases the number of times the light can be emitted and delays the set timing. The lighting device according to claim 2. Further provided with a drive setting means for setting the drive of the cooling unit according to a user operation from the input unit, the detection means is based on the drive setting of the cooling unit, and whether the state of the cooling unit is the driveable state. The lighting device according to claim 2 or 3, wherein it detects whether or not it is in a non-driving state. In the first sampling time, an update means for updating the control step for determining the shortest emission interval according to the relative position from the plurality of control steps is further provided.
The number of times the light can be emitted is the number of times the light source emits light from the start of the continuous light emission to the warning stage in which the shortest light emission interval is maximized among the plurality of control stages. Item 2. The lighting device according to any one of Items 2 to 4. The lighting device according to claim 5, further comprising a display control means for causing the display unit to display a warning when the warning stage is reached. The lighting device according to claim 5 or 6, wherein in the case of the warning stage, updating is performed by the updating means at a sampling time at an interval longer than the first sampling time. The lighting device according to any one of claims 5 to 7, wherein the calculation means calculates the control temperature at the first sampling time. It has a plurality of setting conditions for changing at least one control parameter of the number of possible light emission, the shortest light emission interval, and the operation output of the cooling unit, and the at least one control parameter in at least one of the plurality of setting conditions. Further equipped with a temporary selection means for temporarily selecting
Any of claims 2 to 8, wherein among the tentatively selected control parameters, the minimum number of possible light emission, the maximum shortest light emission interval, and the maximum operation output of the cooling unit are determined as the control parameters. Or the lighting device according to item 1. The optical panel in which the relative positions of the light source and the light source are held changeably and the light distribution angle of the light from the light source is changed according to the relative position and the optical panel heated by the light source are cooled. It is a control method of a lighting device including a cooling unit.
A calculation step of calculating a control temperature, which is a relative temperature of the optical panel, based on the relative position, light emission of the light source, and heat transfer generated by driving the cooling unit.
A control method comprising a control step for controlling an operation output of the cooling unit based on the control temperature. A program comprising executing the control method of claim 10.

Images