JP2013205528A - Luminaire and camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an optical member from being thermally damaged at the time of photographing.SOLUTION: A luminaire which can communicate with a photographic device, includes a light emitting element 7 to emit illumination light for illuminating a subject, an optical member 9 arranged in front of the light emitting element, a temperature sensor 13 to measure temperature of or in proximity to the optical member, and a transmission unit 14 to transmit sensitivity information on the photographic sensitivity of the photographic device on the basis of the temperature detected by the temperature sensor.

Description

  The present invention relates to an illumination device that emits illumination light for illuminating a subject, and a camera that shoots a subject by illuminating the subject with the illumination device.

  Conventionally, when the temperature of a light emitting element rises, a lighting device is known that prevents thermal damage to an optical member disposed in front of the light emitting element by zooming the position of the light emitting element rearward (for example, Patent Document 1). In this illuminating device, it is assumed that shooting is performed in a state where the position of the light emitting element is set to a fixed position. Therefore, it is necessary to zoom the light emitting element to the fixed position every time shooting is performed.

JP 2009-75401 A

  However, when performing continuous shooting using the above-described illumination device, since the zoom movement of the light emitting element is not in time, it is arranged in front of the light emitting element to emit light while the light emitting element is positioned at a fixed position. In some cases, the optical member may become hot and be thermally damaged.

  The objective of this invention is providing the illuminating device which prevents that an optical member receives a thermal damage at the time of imaging | photography.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, it attaches | subjects and demonstrates the code | symbol corresponding to embodiment of this invention, but this invention is not limited to this.

  The illuminating device (2) of the present invention is an illuminating device that can communicate with a photographing device, and is disposed in front of the light emitting element (7) that emits illumination light for illuminating a subject. An optical member (9), a temperature sensor (13) that measures the temperature of the optical member or the vicinity thereof, and a transmission that transmits sensitivity information related to the imaging sensitivity of the imaging device based on the temperature detected by the temperature sensor. Part (14).

  The camera (3) of the present invention is a camera that can be photographed using an illumination device that emits illumination light that illuminates a subject, and includes a receiver (34) that receives sensitivity information from the illumination device; A change unit (34) that changes sensitivity information based on the sensitivity information received via the reception unit, and a determination unit (34) that determines the light emission amount of the lighting device based on the changed sensitivity information changed by the change unit. ) And a transmission unit (34) for transmitting a light emission instruction to emit light with the light emission amount determined by the determination unit to the illumination device.

  According to the present invention, it is possible to prevent the optical member from being thermally damaged during photographing.

It is the figure which looked at the internal structure of the illuminating device which concerns on embodiment from the side surface. It is a figure which shows the internal mechanism of the light emission part of the illuminating device which concerns on embodiment. It is a circuit block diagram which shows the system configuration | structure of the illuminating device and camera which concern on embodiment. It is a flowchart which shows the process of the illuminating device which concerns on embodiment.

  Hereinafter, an illumination device according to an embodiment will be described with reference to the drawings. Drawing 1 is a figure which looked at the internal configuration of lighting installation 2 concerning an embodiment from the side. The illuminating device 2 includes a light emitting unit 4 and a main body unit 6. The light emitting unit 4 is rotatably attached to the main body unit 6 so as to bounce upward from a horizontal position.

  Inside the light emitting unit 4, there are provided a xenon tube 7 which is a light emitting element, and a reflection mirror 8 which reflects direct light emitted from the xenon tube 7, and light is emitted from the xenon tube 7 in front of the xenon tube 7. A Fresnel panel 9 that collects the direct light and the reflected light reflected by the reflecting mirror 8 is provided. The subject is illuminated with the illumination light collected by the Fresnel panel 9.

  Further, inside the light emitting unit 4, a zoom guide shaft 11 for zooming the position of the light emitting unit 10 including the xenon tube 7 and the reflecting mirror 8 to the tele side or the wide side shown in FIG. A drive motor 12 for adjusting the irradiation angle of illumination light emitted through the Fresnel panel 9 by zooming along the guide shaft 11 and a temperature sensor 13 for measuring the temperature in the vicinity of the Fresnel panel 9 are provided. Yes. The temperature sensor 13 may measure the temperature of the Fresnel panel 9 itself.

  Here, as shown by a two-dot chain line in FIG. 2, when the light emitting unit 10 is zoomed to the tele side by the drive motor 12 and moved away from the Fresnel panel 9, the temperature of the Fresnel panel 9 decreases and measured by the temperature sensor 13. The temperature in the vicinity of the Fresnel panel 9 is lowered. On the other hand, when the light emitting unit 10 is zoomed to the wide side by the drive motor 12 and brought closer to the Fresnel panel 9, the temperature of the Fresnel panel 9 rises and the temperature near the Fresnel panel 9 measured by the temperature sensor 13 increases. .

  Further, inside the main body 6, a control circuit 14 that comprehensively controls each part of the lighting device 2, a main capacitor 16 that stores electric energy for causing the xenon tube 7 to emit light, and an emission amount of the xenon tube 7 are adjusted. A light emitting circuit 18 for boosting, a booster circuit 20 for boosting the voltage of the power supply, and a bounce angle detection switch 22 for detecting the angle bounced by the light emitting unit 4. Moreover, the attachment part 24 which attaches the illuminating device 2 to a camera is provided in the lower surface of the main-body part 6, and it communicates between cameras with the attachment part 24 in the state which attached the illuminating device 2 to the camera. A communication terminal 25 is provided.

  FIG. 3 is a circuit block diagram showing a system configuration of the illumination device 2 according to the embodiment. The lighting device 2 includes a control circuit 14, and a booster circuit 20, a light emitting circuit 18, and a communication terminal 25 are connected to the control circuit 14.

  The control circuit 14 outputs a boost signal for controlling the operation of the boost circuit 20. When the boost signal is input, the booster circuit 20 boosts the voltage of the power supply 30 and charges the main capacitor 16. Further, the control circuit 14 outputs a light emission signal for causing the xenon tube 7 to emit light to the light emission circuit 18. The light emission circuit 18 adjusts the light emission amount of the xenon tube 7 based on the input light emission signal. In addition, the control circuit 14 transmits / receives information regarding photographing sensitivity (ISO value, etc.) to and from the camera via the communication terminal 25.

  In addition, a bounce angle detection switch 22, a drive motor 12, and a temperature sensor 13 are connected to the control circuit 14. The control circuit 14 detects the bounce angle of the light emitting unit 4 via the bounce angle detection switch 22. Further, the control circuit 14 adjusts the illumination angle of the illumination light by driving the drive motor 12 and zooming the light emitting unit 10 to the telephoto side or the wide side (see FIG. 2). Further, the control circuit 14 measures the temperature near the Fresnel panel 9 by the temperature sensor 13.

  In addition, the camera 3 includes a control circuit 34 that comprehensively controls each unit of the camera 3, and an imaging element 36 and a communication terminal 38 are connected to the control circuit 34. The control circuit 34 images light from the subject via the photographing lens (not shown) by the image sensor 36. In addition, communication with the illumination device 2 attached to the camera 3 is performed via the communication terminal 38.

  FIG. 4 is a flowchart showing processing of the illumination device 2 according to the embodiment. First, when the illumination device 2 is attached to the camera 3 via the attachment portion 24 and the illumination device 2 is turned on, the control circuit 14 communicates with the camera 3 via the communication terminal 25 to 3 is acquired and stored in a storage unit (not shown) regarding the ISO value set in 3 (hereinafter referred to as the set ISO value) (step S1). Thereafter, the control circuit 14 communicates with the camera 3 at regular time intervals, and periodically acquires information on the current ISO value of the camera 3 (hereinafter referred to as the current ISO value).

  Next, the control circuit 14 measures the temperature near the Fresnel panel 9 by the temperature sensor 13 (step S2). Here, the following description will be made on the assumption that the light emitting unit 10 is located in the vicinity of the Fresnel panel 9. Next, the control circuit 14 determines whether or not the temperature measured by the temperature sensor 13 is equal to or higher than T1 ° C. (Step S3). Here, the operator can arbitrarily set a value of T1 ° C., which is a threshold temperature.

  When the temperature measured by the temperature sensor 13 is equal to or higher than T1 ° C. (step S3: Yes), the control circuit 14 further determines whether or not the temperature detected by the temperature sensor 13 is equal to or higher than T2 ° C. (Step S4). Here, the temperature of T2 ° C. is higher than T1 ° C. (T2 ° C.> T1 ° C.), and the operator can arbitrarily set the value of T2 ° C.

  When the temperature measured by the temperature sensor 13 is not T2 ° C. or higher (step S4: No), that is, when the temperature measured by the temperature sensor 13 is T1 ° C. or higher and lower than T2 ° C., the control circuit 14 It is determined whether or not the current ISO value of 3 is K1 times the set ISO value (step S5). For example, when the set ISO value is ISO400 and the magnification of K1 is twice, the control circuit 14 determines whether or not the current ISO value is ISO800 that is twice that of ISO400. The operator can arbitrarily set the magnification of K1.

  When the current ISO value is K1 times the set ISO value (step S5: Yes), the control circuit 14 determines whether or not the illumination device 2 is turned off (step S6). When the power supply of the illuminating device 2 is turned off (step S6: Yes), the control circuit 14 ends a series of processes. When the power supply of the illuminating device 2 is not turned off (step S6: No), it returns to the process of step S2.

  On the other hand, if the current ISO value is not K1 times the set ISO value (step S5: No), the control circuit 14 sets the current ISO value to the camera 3 via the communication terminal 25 by K1 times the set ISO value. An instruction to change to a value is transmitted (step S7).

  When receiving an instruction via the communication terminal 38, the control circuit 34 of the camera 3 changes the current ISO value to a value that is K1 times the set ISO value based on the received instruction. And the light emission amount (guide number (GN)) of the illuminating device 2 is calculated by Formula 1 using the changed ISO value.

Light emission amount (GN) = shooting distance (m) × aperture value (F value) × √ (100 / ISO value)
According to Equation 1, when the ISO value is increased by K1 times, the light emission amount value is reduced by 1 / √K1 times.

  Here, when the release operation is performed by the operator, the control circuit 34 of the camera 3 emits light with the light emission amount calculated by Equation 1 to the lighting device 2 via the communication terminal 38 and the communication terminal 25. Send instructions. When receiving the instruction, the control circuit 14 causes the xenon tube 7 to emit light with the light emission amount calculated by Equation 1, and emits illumination light through the Fresnel panel 9 to illuminate the subject. Further, the control circuit 34 of the camera 3 shoots the subject with the imaging element 36 with the changed ISO value in a state where the subject is illuminated with the illumination light.

  In step S4, when the temperature measured by the temperature sensor 13 is equal to or higher than T2 ° C. (step S4: Yes), the control circuit 14 determines that the current ISO value of the camera 3 is K2 times the set ISO value. It is determined whether or not there is (step S8). For example, when the set ISO value is ISO400 and the magnification of K2 is four times, the control circuit 14 determines whether or not the current ISO value is ISO1600 that is four times that of ISO400. Note that the magnification of K2 is larger than K1 (K2> K1), and the operator can arbitrarily set the magnification of K2.

  When the current ISO value is K2 times the set ISO value (step S8: Yes), the process proceeds to step S6. On the other hand, when the current ISO value is not K2 times the set ISO value (step S8: No), the control circuit 14 sets the current ISO value to the camera 3 via the communication terminal 25 and sets the current ISO value K2. An instruction to change to a double value is transmitted (step S9).

  When receiving the instruction via the communication terminal 38, the control circuit 34 of the camera 3 changes the current ISO value to a value K2 times the set ISO value based on the received instruction, and uses the changed ISO value. The amount of light emitted from the illumination device 2 is calculated using Equation 1. Note that the light emission amount when the current ISO value is changed to a value K2 times the set ISO value is further reduced from the light emission amount when the current ISO value is changed to a value K1 times the set ISO value. Specifically, when the current ISO value is changed to ISO 1600, which is four times the set ISO value (ISO 400), the light emission amount is 1 / √2 when ISO 800 is set (twice the set ISO value). The value is double that of the set ISO value (ISO400).

  In step S3, when the temperature measured by the temperature sensor 13 is not equal to or higher than T1 ° C. (step S3: No), the control circuit 14 determines whether or not the current ISO value is a set ISO value (step S3). S10). When the current ISO value is the set ISO value (step S10: Yes), the process proceeds to step S6. On the other hand, when the current ISO value is not the set ISO value (step S10: No), the control circuit 14 transmits an instruction to return the current ISO value to the set ISO value to the camera 3 via the communication terminal 25. (Step S11).

  When receiving the instruction via the communication terminal 38, the control circuit 34 of the camera 3 returns the current ISO value to the set ISO value based on the received instruction, and uses the set ISO value to emit light of the lighting device 2 according to Equation 1. Calculate the amount.

  According to the lighting device 2 and the camera 3 according to this embodiment, when the temperature measured by the temperature sensor 13 is a temperature equal to or higher than T1 ° C., the light emission amount of the lighting device 2 is reduced and generated in the light emitting unit 10. In order to suppress heat, it is possible to prevent the optical member from being thermally damaged during continuous shooting. Further, when the light emission amount is decreased, the ISO value of the camera is increased in accordance with the decrease in the light emission amount, so that it is possible to perform photographing with appropriate exposure.

  In the above-described embodiment, T1 ° C. and T2 ° C. are set as threshold temperatures, but a threshold temperature higher than T2 ° C. may be provided. For example, if the temperature measured by the temperature sensor 13 is equal to or higher than T3 ° C. (T3 ° C.> T2 ° C.), whether or not the current ISO value is K3 times the set ISO value (K3> K2). May be determined. Further, a plurality of threshold values of temperatures higher than T3 ° C. may be set. Thereby, the ISO value of the camera 3 can be increased stepwise as the temperature in the vicinity of the Fresnel panel 9 increases.

  Further, in the above-described embodiment, an external illumination device that is mounted on a camera and used is described as an example. However, the illumination device may be of a type that is built in the camera. Since the lighting device built in the camera cannot zoom the light emitting portion, the optical member is effectively thermally damaged by reducing the amount of light emission and suppressing the heat generated in the light emitting portion. Can be prevented. The lighting device may be a remote lighting device that can be used in a state of being separated from the camera.

  In the above-described embodiment, the case where the magnification of K1 that is a multiple of the set ISO value is 2 times and the magnification of K2 is 4 times is described as an example. However, the value of the magnification is an integer value. It is not limited to. For example, the magnification of K1 may be set to 1.4 times, and the magnification of K2 may be set to 2.8 times. Further, when the temperature measured by the temperature sensor 13 exceeds a predetermined temperature, an instruction to directly change the current ISO value to the predetermined ISO value to the camera 3 without multiplying the set ISO value by the magnification. May be performed.

  In the above-described embodiment, an LCD display unit is provided on the back surface of the main body unit 6 of the lighting device 2, and the instruction content is displayed when an instruction to change the current ISO value is given to the camera 3. You may do it. For example, when an instruction is given to change the current ISO value to ISO 800, which is twice the set ISO value (ISO 400), the LCD display unit may display “ISO 400 → 800”.

  Moreover, in the above-mentioned embodiment, the light emitting element provided in the light emitting unit 4 is not limited to the xenon tube, and for example, an LED light source may be provided as the light emitting element.

DESCRIPTION OF SYMBOLS 2 ... Illuminating device, 3 ... Camera, 4 ... Light emission part, 6 ... Main part, 7 ... Xenon tube, 8 ... Reflection mirror, 9 ... Fresnel panel, 10 ... Light emission part, 12 ... Drive motor, 13 ... Temperature sensor, 14 ... Control circuit, 18 ... Light emitting circuit, 24 ... Mounting part, 25 ... Communication terminal, 34 ... Control circuit, 36 ... Image sensor, 38 ... Communication terminal

Claims (8)

A lighting device capable of communicating with a photographing device,
A light emitting element that emits illumination light to illuminate a subject;
An optical member disposed in front of the light emitting element;
A temperature sensor for measuring the temperature of the optical member or the vicinity thereof;
An illumination apparatus comprising: a transmission unit configured to transmit sensitivity information related to imaging sensitivity of the imaging apparatus based on a temperature detected by the temperature sensor.   The lighting device according to claim 1, wherein the transmission unit transmits an instruction to increase imaging sensitivity to the camera when a temperature equal to or higher than a predetermined temperature is detected by the temperature sensor.   The lighting device according to claim 1, wherein the transmission unit transmits an instruction to increase the photographing sensitivity in a stepwise manner to the camera based on a temperature detected by the temperature sensor.   The said transmission part transmits the instruction | indication which returns to the imaging sensitivity before raising the said imaging sensitivity, when the temperature lower than the said predetermined temperature is detected by the said temperature sensor. The lighting device according to claim 1.   The illuminating device according to claim 1, further comprising a display unit that displays an instruction content by the transmission unit.   The lighting device according to claim 1, wherein the light emitting element is a xenon tube. A camera capable of photographing using an illumination device that emits illumination light that illuminates a subject,
A receiver for receiving sensitivity information from the lighting device;
A changing unit for changing sensitivity information based on the sensitivity information received via the receiving unit;
A determination unit that determines the light emission amount of the illumination device based on the change sensitivity information changed by the change unit;
A camera comprising: a transmission unit configured to transmit a light emission instruction to emit light with the light emission amount determined by the determination unit to the illumination device. The receiving unit receives an instruction to return the change sensitivity information to the sensitivity information before the change,
The camera according to claim 7, wherein the determination unit determines a light emission amount of the lighting device based on sensitivity information before the change.

Images