JP2010153110A - Light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device which adjusts chromaticity without lowering a quantity of light. <P>SOLUTION: This light source device 1 includes a plurality of LEDs 11 to emit illumination light having at least two kinds of wavelength components toward inwards in the radial direction of a circular ring, a light guide member 12 to guide illumination light emitted from the LED 11 in the direction along the axis 0 of the circular ring, a rotary motor 13 to rotationally drive the light guide member 12 around the axis 0, a setting portion 16 to set the wavelength component ratio of light emitted from the light guide member 12, a rotation control portion 18 to control the rotational speed of the rotary motor 13 so that the wave length component ratio of light obtained in the sum of times during which the entrance plane 20 of the light guide member 12 faces the LED 11 to emit each wavelength component becomes the same wavelength component ratio set by the setting portion 16, and a light source control portion 19 to determine the light emitting time of the LED 11 in accordance with the time during which the entrance plane 20 of the light guide member 12 faces the LED, and to make the LED 11 emit pulsed light at a time the entrance plane 20 of the light guide member 12 faces the LED. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a light source device including a plurality of light sources.

Conventionally, a light source device that emits high-intensity light by sequentially turning on light sources such as LEDs arranged in an annular shape with high output and rotating a light guide rod in accordance with the lighting cycle is known (for example, , See Patent Document 1). In addition, in a field sequential color camera, a technique is known in which when a color filter color is switched to an area where the color filter is reached, the rotation speed of the motor is increased to shorten the time during which the colors are mixed (see, for example, Patent Document 2). .
Japanese Patent No. 4027747 JP-A-8-331572

  However, according to the technique disclosed in Patent Document 1, since the rotation speed of the motor is constant, when adjusting the chromaticity of the light emitted from the light guide rod, the light amount of the LED of a specific color is set. As a reference, the output of LEDs of other colors is lowered. For this reason, the LEDs other than the reference LED are used at a maximum output or less, and there is an inconvenience that the amount of light as a whole is reduced. On the other hand, according to the technique disclosed in Patent Document 2, since the motor is simply switched at the maximum speed and the minimum speed, there is a disadvantage that the chromaticity cannot be adjusted.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a light source device capable of adjusting the chromaticity of emitted light without reducing the amount of light.

In order to achieve the above object, the present invention employs the following means.
The present invention includes a plurality of light sources that are arranged side by side in an annular shape and emit illumination light having at least two types of wavelength components radially inward of the ring, and incident light that emits illumination light emitted from the light source. A light guide portion disposed with its surface directed radially outward of the ring and guiding incident illumination light in a direction along the center axis of the ring; and the light guide portion around the center axis The total of the time during which the rotating part that rotates and rotates, the setting part that sets the wavelength component ratio of the light emitted from the light guide part, and the light source that emits each wavelength component on the incident surface of the light guide part A rotation control unit for controlling the rotation speed of the rotating unit, and an incident surface of the light guide unit so that the wavelength component ratio of the light obtained in the step is the same as the wavelength component ratio set by the setting unit. The light emission time of the light source is determined according to the facing time, and the light guide is turned on. Surface adopts a light source device and a light source control unit for pulse emission of the light source at a timing opposite.

  According to the present invention, the wavelength component ratio of the light obtained by the rotation control unit by the total time for which the incident surface of the light guide unit faces each light source is the same as the wavelength component ratio set by the setting unit. As described above, the rotation speed of the rotating unit is controlled. Thereby, for each wavelength component, the time during which the incident surface of the light guide portion faces the light source is changed, and the chromaticity of the superimposed light obtained by superimposing the illumination light from each light source can be adjusted. In addition, the light source control unit determines the light emission time of the light source according to the time the light guide unit is facing, thereby changing the total amount of light incident on the incident surface of the light guide unit from each light source and superimposing it. The amount of light can be adjusted. As described above, the chromaticity and light amount of the superimposed light emitted from the light guide unit can be adjusted at the same time, and the light amount can be increased while setting the superimposed light to a desired chromaticity.

  In the above invention, the rotation control unit is incident on the specific light source that emits illumination light necessary to make the light emitted from the light guide unit have a wavelength component ratio set by the setting unit. It is good also as making the rotational speed of the said rotation part small when a surface approaches.

  By doing so, it is possible to lengthen the time during which the incident surface of the light guide portion faces the specific light source, and to allow a large amount of illumination light from the specific light source to be incident on the light guide portion. By making the ratio coincide with the wavelength component ratio set by the setting unit, the superimposed light can have a desired chromaticity.

  In the above invention, the light source control unit lengthens the light emission time of the specific light source that emits illumination light necessary to set the light emitted from the light guide unit to the wavelength component ratio set by the setting unit. It is good.

  By doing in this way, the total value of the amount of light incident on the incident surface of the light guide unit while the incident surface of the light guide unit faces the specific light source can be increased and emitted from the light guide unit. The superimposed light can have a desired chromaticity and the amount of light can be increased.

  In the above invention, a detection unit for detecting a wavelength component ratio of light emitted from the light guide unit, and a wavelength component ratio detected by the detection unit so as to coincide with a wavelength component ratio set by the setting unit It is good also as providing the calculating part which calculates the rotational speed of the said rotation part, and the light emission time of the said light source.

  By doing so, the rotation speed of the rotating unit and the light emission time of the light source are set so that the wavelength component ratio of the light emitted from the light guide unit matches the wavelength component ratio set by the setting unit by the calculation unit. Is calculated, and the rotation control unit and the light source control unit can control the rotation unit and the light source. Thereby, the adjustment accuracy can be improved while facilitating the adjustment operation of the chromaticity and the light amount of the superimposed light emitted from the light guide unit.

In the above invention, the calculation unit calculates a rotation speed of the rotation unit and a light emission time of the light source so as to minimize a light extinguishing period of the light source while the light guide unit faces the light source. It is good as well.
By doing so, the amount of light can be maximized while the superimposed light has a desired chromaticity.

  According to the present invention, there is an effect that the chromaticity of emitted light can be adjusted without reducing the amount of light.

[First Embodiment]
The light source device according to the first embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic diagram illustrating the configuration of the light source device according to the present embodiment.
As shown in FIG. 1, the light source device 1 according to the present embodiment includes a plurality of LEDs (light sources) 11 arranged in an annular shape and a light guide member (inner radial direction of the ring) ( A light guide unit 12, a rotation motor 13 that rotates the light guide member 12 about the central axis 0 of the ring, a rotation sensor 14 that detects a rotation angle of the rotation motor 13, and a light guide member. 12 chromaticity sensors (detection units) 15 arranged on the emission optical axis, a setting unit 16 for setting the chromaticity of the emitted light, and a calculation unit 17 for calculating the rotation speed of the rotary motor 13 and the emission time of the LED 11. And a rotation control unit 18 that controls the rotary motor 13 and a light source control unit 19 that controls the LED 11.

  As shown in FIG. 2, the LEDs 11 are arranged side by side with the optical axis facing the center of the ring, and emit illumination light of three types of wavelength components inward in the radial direction of the ring. Yes. In the present embodiment, the LED 11 includes a green LED (symbols L1 to L6) that emits green illumination light, a blue LED (symbols L7 to L9) that emits blue illumination light, and a red that emits red illumination light. It demonstrates as what is comprised from LED (code | symbol L10-L12).

  The light guide member 12 has an incident surface 20 on which illumination light emitted from the LED 11 is incident, and the incident surface 20 is disposed with the annular surface facing outward in the radial direction. As shown in FIG. 1, the light guide member 12 includes a light guide rod 21 that guides illumination light incident on the incident surface 20 inward in the radial direction of the ring, and illumination guided by the light guide rod 21. And a prism 22 that reflects light in a direction along the center axis 0 of the ring. A lens 23 is provided in a direction along the central axis 0 of the ring, and emits illumination light reflected by the prism 22.

  The rotation motor 13 is disposed so that the rotation axis thereof coincides with the center axis 0 of the ring, and the light guide rod 21 and the prism 22 are integrally rotated around the center axis 0. .

The rotation sensor 14 is composed of, for example, a reflective photosensor (photoreflector), and detects the rotation angle of the rotation motor 13, that is, the rotation angle of the light guide member 12.
The chromaticity sensor 15 is a photoelectric conversion element that converts light energy into electric power, such as a CCD, and detects the chromaticity of light emitted from the light guide member 12, that is, the wavelength component ratio.

  The setting unit 16 sets the wavelength component ratio of light emitted from the light guide member 12 by selecting the chromaticity of light desired by the user. Further, the setting unit 16 may automatically set the wavelength component ratio of the light emitted from the light guide member 12 when the user selects the application of the light source device 1.

  The calculation unit 17 calculates the rotation speed of the rotary motor 13 and the light emission time of the LED 11 so that the wavelength component ratio detected by the chromaticity sensor 15 matches the wavelength component ratio set by the setting unit 16. ing.

  That is, the calculation unit 17 uses the wavelength component set by the setting unit 16 so that the wavelength component ratio of the light obtained as the sum of the time during which the incident surface 20 of the light guide member 12 faces the LED 11 emitting each wavelength component is set. The rotational speed of the rotary motor 13 is calculated so as to be the same ratio as the ratio. Specifically, the calculation unit 17 specifies the LED 11 that emits illumination light necessary to match the wavelength component ratio of the light emitted from the light guide member 12 with the wavelength component ratio set by the setting unit 16. Identify as light source. Here, it demonstrates as a specific light source being green LED (code | symbol L1-L6). And the calculating part 17 makes the rotational speed of the rotation motor 13 small, when the entrance plane 20 of the light guide member 12 approaches green LED which is a specific light source.

  The calculation unit 17 includes a light emission magnification calculation unit 27 that calculates a light emission time when the LED 11 emits pulses, that is, a light emission magnification. The light emission magnification calculation unit 27 determines the light emission time of the LED 11 according to the time that the incident surface 20 of the light guide member 12 faces (changes according to the rotation speed of the rotary motor 13). Specifically, when the rotation speed is reduced, the light emission magnification calculation unit 27 continuously emits the green LED that is the specific light source while the incident surface 20 of the light guide member 12 is facing. As shown, the light emission time of the green LED is lengthened.

  Furthermore, the light emission magnification calculation unit 27 calculates the light emission time of each LED 11 so as to minimize the turn-off period of the LED 11 while the incident surface 20 of the light guide member 12 faces the LED 11. Specifically, the light emission magnification calculating unit 27 continues the blue LED (reference L7 to L9) and the red LED (reference L10 to L12) while the incident surface 20 of the light guide member 12 is facing. The light emission time of the blue LED and the red LED is changed so as to emit light.

Here, the relationship between the duty and the light emission magnification will be described with reference to FIG.
The duty is the ratio of the light emission time per unit time. For example, when the light is emitted for 0.1 sec per second, the duty is 10%. When the light is emitted for 0.2 sec per second, the duty is 20%. It becomes. That is, a large duty means that the ratio of the light emission time is large.

  Next, the light emission magnification will be described. For example, it is known that an LED can instantaneously obtain bright light by instantaneously passing a current 10 times the rated current. Therefore, when the duty is 10%, a current that is 10 times the rated current and when the duty is 20%, a current that is 5 times the rated current can be instantaneously passed. The light emission magnification indicates how many times the amount of light obtained at this time is the amount of light when a rated current is passed. An LED having the characteristics shown in FIG. 3 is generally used.

  As shown in FIG. 3, the LED has a characteristic that although the light emission magnification decreases when the duty is increased, the duty and the light emission magnification are not in a proportional relationship. For this reason, even if the duty increases, the amount of light does not decrease proportionally but only slightly decreases. Therefore, as in the present embodiment, by increasing the emission time of the specific light source, that is, by increasing the duty, the peak value of the light amount of the specific light source is slightly reduced, but the capture time from the specific light source is increased. A large amount of light can be obtained in total.

The rotation control unit 18 controls the rotation motor 13 at the rotation speed calculated by the calculation unit 17.
Based on the rotation angle of the light guide member 12 detected by the rotation sensor 14, the light source control unit 19 identifies the LED 11 that the incident surface 20 of the light guide member 12 faces, and the incident surface 20 of the light guide member 12 faces. The LED 11 sequentially emits pulses at the timing of the operation. At that time, the light source control unit 19 controls the LED 11 so that the light emission time of the LED 11 becomes the light emission time calculated by the calculation unit 17.

The operation of the light source device 1 having the above configuration will be described below.
When the light source device 1 is driven, the rotation control unit 18 outputs a control signal for driving the rotation motor 13 to rotate. Thereby, the rotation motor 13 rotates the light guide member 12 around the central axis 0. The rotation sensor 14 detects the rotation angle of the light guide member 12 (rotary motor 13).

  When the rotation speed of the light guide member 12 becomes equal to or higher than a predetermined value, the light source controller 19 starts pulse lighting of the LED 11. Specifically, the light source control unit 19 identifies the LED 11 with which the incident surface 20 of the light guide member 12 faces based on the rotation angle of the light guide member 12 detected by the rotation sensor 14, and for the identified LED 11 Supply power and emit illumination light. At this time, the LED 11 emits high-luminance illumination light by instantaneously lighting the pulse with a current higher than the rated value.

  Thereby, the illumination light emitted from the LED 11 and incident from the incident surface 20 of the light guide member 12 is reflected by the prism 22, passes through the lens 23, and is emitted in a direction along the central axis 0. At this time, the light from each LED 11 appears to be superimposed and emitted as white light.

Next, a method for adjusting the chromaticity of the superimposed light emitted in this way will be described below with reference to the flowcharts shown in FIGS.
Hereinafter, the area where the green LEDs (reference numerals L1 to L6) are arranged is the area C1, the area where the blue LEDs (reference numerals L7 to L9) are arranged is the area C2, and the area where the red LEDs (reference numerals L10 to L12) are arranged. Will be described as region C3.

When the operation is started (S1) and the chromaticity (wavelength component ratio) of the superimposed light from the light guide member 12 is set in the setting unit 16 (S2), the chromaticity sensor 15 detects the chromaticity of the superimposed light. (S3).
When a color shift is recognized between the chromaticity set in the setting unit 16 and the chromaticity detected by the chromaticity sensor 15 (S4), it is determined whether or not the amount of light in the region C1 is small (S5). ).

When the amount of light in the region C1 is small, the rotation speed of the light guide member 12 in the region C1 is reduced (S11), the duty factor in the region C1 is calculated by the light emission magnification calculator 27 (S12), and the duty is increased. (S13).
Next, the rotation speed of the light guide member 12 in the area C2 and the area C3 is calculated (S14), and the rotation speed is increased (S15).

Next, the duty factor in the region C2 and the region C3 is calculated by the light emission magnification calculating unit 27 (S16), and those Duty are reduced (S17).
Next, the chromaticity of the superimposed light is detected again by the chromaticity sensor 15 (S18), and a color shift is recognized between the chromaticity set in the setting unit 16 and the chromaticity detected by the chromaticity sensor 15. Then (S19), it is determined whether or not the amount of light in the region C2 is small (S20).

  When the amount of light in the region C2 is small, the rotation speed of the light guide member 12 in the region C2 is reduced (S21), the light emission magnification calculation unit 27 calculates the duty in the region C2 (S22), and the duty is increased. (S23).

  Next, the chromaticity of the superimposed light is detected again by the chromaticity sensor 15 (S24), and a color shift is recognized between the chromaticity set in the setting unit 16 and the chromaticity detected by the chromaticity sensor 15. Then (S25), it is determined whether or not the amount of light in the region C3 is small (S26).

When the amount of light in the region C3 is small, the process returns to S3 and the chromaticity adjustment of the superimposed light is continued.
When the amount of light in the region C3 is sufficient, the amount of light necessary for the region C3 is calculated (S27), the duty is reduced (S28), and the process returns to S3 to continue the chromaticity adjustment of the superimposed light. The

On the other hand, if the amount of light in the region C2 is sufficient in S20, it is determined whether or not the amount of light in the region C3 is small (S30).
When the amount of light in the region C3 is small, the rotation speed of the light guide member 12 in the region C3 is reduced (S31), the light emission magnification calculation unit 27 calculates the duty in the region C3 (S32), and the duty is increased. (S33).

  Next, the chromaticity of the superimposed light is detected again by the chromaticity sensor 15 (S34), and a color shift is recognized between the chromaticity set in the setting unit 16 and the chromaticity detected by the chromaticity sensor 15. Then (S35), it is determined whether the amount of light in the region C2 is small (S36).

When the amount of light in the region C2 is small, the process returns to S3 and the chromaticity adjustment of the superimposed light is continued.
When the amount of light in the region C2 is sufficient, the amount of light necessary for the region C2 is calculated (S37), the duty is reduced (S38), and the process returns to S3 to continue the chromaticity adjustment of the superimposed light. The

  In S5, if the amount of light in the region C1 is sufficient, it is determined whether or not the amount of light in the region C2 is small (S6). If the amount of light in the region C2 is small, the same as S11 to S38 described above. Are performed (S41 to S68).

  In S6, if the amount of light in the region C2 is sufficient, it is determined whether or not the amount of light in the region C3 is small (S7). If the amount of light in the region C3 is small, the same as S11 to S38 described above. Are performed (S71 to S98). On the other hand, when the amount of light in the region C3 is sufficient in S7, the process returns to S3 and the chromaticity adjustment of the superimposed light is continued.

The effect of the light source device 1 that performs the above operation will be described below.
Here, as a comparative example, a method for adjusting the chromaticity of superimposed light in a conventional light source device will be described with reference to FIG.
In the conventional light source device shown in FIG. 19, the amount of illumination light from the blue LED (reference L7 to L9) and the red LED (reference L10 to L12) with respect to the amount of illumination light from the green LED (reference L1 to L6). Is large, the chromaticity of the superimposed light emitted from the light guide member 12 is adjusted by shortening the light emission time of the blue LED and the red LED. Therefore, while the incident surface 20 of the light guide member 12 is facing, the blue LED and the red LED are turned off, and the amount of light from these LEDs is lost. As a result, the amount of superimposed light emitted from the light guide member 12 is reduced.

  On the other hand, in the light source device 1 according to the present embodiment, as shown in FIG. 11, in the region C1 where the green LEDs (reference numerals L1 to L6) are arranged, the rotation speed of the light guide member 12 is reduced, Increase the light emission time of the green LED. On the other hand, in the area C2 where the blue LEDs (reference numerals L7 to L9) are arranged and the area C3 where the red LEDs (reference signs L10 to L12) are arranged, the rotational speed of the light guide member 12 is increased, and the blue and red LEDs are also increased. Reduce the flash time of. Thereby, more illumination light emitted from each LED can be captured.

  As described above, according to the light source device 1 according to the present embodiment, the wavelength component ratio of the light obtained by the rotation control unit 18 as the total of the time when the incident surface 20 of the light guide member 12 faces each LED 11. However, the rotational speed of the rotary motor 13 is controlled so as to be the same ratio as the wavelength component ratio set by the setting unit 16. Thus, for each wavelength component, the time during which the incident surface 20 of the light guide member 12 faces each LED 11 is changed, and the chromaticity of the superimposed light obtained by superimposing the illumination light from each LED 11 is adjusted. Can do. Further, the light source control unit 17 determines the light emission time of each LED 11 according to the time when the light incident surface 20 of the light guide member 12 is facing, so that the light enters the light incident surface 20 of the light guide member 12 from each LED 11. The total amount of light can be changed to adjust the amount of superimposed light. As described above, the chromaticity and light amount of the superimposed light emitted from the light guide member 12 can be adjusted at the same time, and the light amount can be increased while setting the superimposed light to a desired chromaticity.

  Further, the chromaticity of the superimposed light is detected by the chromaticity sensor 15, and the rotation speed of the rotary motor 13 is set so that the wavelength component ratio of the superimposed light matches the wavelength component ratio set by the setting unit 16 by the calculation unit 17. By calculating the light emission time of each LED 11, the adjustment accuracy can be improved while facilitating the adjustment operation of the chromaticity and the light amount of the superimposed light emitted from the light guide member 12.

[Second Embodiment]
Next, a light source device according to a second embodiment of the present invention will be described with reference to the drawings.
The light source device according to the present embodiment is different from the first embodiment in that the rotational speed of the rotary motor 13 is controlled so that the non-light emission period of each LED 11 is as small as possible. Hereinafter, the light source device 2 of the present embodiment will not be described for points that are common to the first embodiment, and different points will be mainly described. Since the device configuration is the same as that of the first embodiment, the same reference numerals are used for the respective components.

Below, the adjustment method of the chromaticity of the superimposing light inject | emitted from the light guide member 12 is demonstrated using the flowchart shown in FIG. 12 and FIG.
When the operation is started (S101) and the chromaticity (wavelength component ratio) of the superimposed light from the light guide member 12 is set in the setting unit 16 (S102), the chromaticity sensor 15 detects the chromaticity of the superimposed light. (S103).
When a color shift is recognized between the chromaticity set in the setting unit 16 and the chromaticity detected by the chromaticity sensor 15 (S104), it is determined whether or not the chromaticity is appropriate (S104). S105).

When the chromaticity is appropriate, it is determined whether or not there is a non-lighting period in the green LEDs (reference numerals L1 to L6) in the region C1 (S111).
When there is a non-lighting period in the area C1, the rotation speed of the light guide member 12 is detected by the rotation sensor 14 (S112), and it is determined whether the rotation speed is equal to or lower than the maximum speed (S113).

  When the detected rotation speed is equal to or lower than the maximum speed, the process returns to S103 and the chromaticity adjustment of the superimposed light is continued. On the other hand, when the rotation speed is higher than the maximum speed, the rotation speed in the region C1 is increased (S114), and the process returns to S103 and the chromaticity adjustment of the superimposed light is continued.

  In S111, when there is no non-lighting period in the area C1, it is determined whether or not the blue LED (reference numerals L7 to L9) has a non-lighting period in the area C2 (S121), and there is a non-lighting period. The same processing as S112 to S114 described above is performed (S122 to S124).

  In S121, when there is no non-lighting period in the region C2, it is determined whether or not the red LED (reference numerals L10 to L12) has a non-lighting period in the region C3 (S131). The same processing as S112 to S114 described above is performed (S132 to S134).

  On the other hand, if the chromaticity is not appropriate in S105, it is determined whether or not the amount of light in the region C1 is large (S106). When the amount of light in the region C1 is large, the duty in the region C1 is reduced (S110), and the process returns to S103 to continue the chromaticity adjustment of the superimposed light.

  If the amount of light in area C1 is not large in S106, it is determined whether the amount of light in area C2 is large (S107). When the amount of light in the region C2 is large, the duty in the region C2 is reduced (S120), and the process returns to S103 to continue the chromaticity adjustment of the superimposed light.

  If the amount of light in the region C2 is not large in S107, it is determined whether or not the amount of light in the region C3 is large (S108). When the amount of light in the region C3 is large, the duty in the region C3 is reduced (S130), and the process returns to S103 to continue the chromaticity adjustment of the superimposed light.

  As described above, according to the light source device 2 of the present embodiment, the rotational speed of the rotary motor 13 is increased so as to eliminate the non-light emitting period of the LED 11 as shown in the timing chart of FIG. Thereby, while making superimposition light inject | emitted from the light guide member 12 make desired chromaticity, while being able to maximize the light quantity, control at the time of chromaticity adjustment of superimposition light can be made easy. .

[Third Embodiment]
Next, a light source device according to a third embodiment of the present invention will be described with reference to the drawings.
The light source device according to this embodiment is different from the above-described embodiments in that only some of the LEDs 11 arranged in a ring shape are caused to emit light. Hereinafter, with respect to the light source device 3 of the present embodiment, description of points that are common to the above-described embodiments will be omitted, and different points will be mainly described. Since the device configuration is the same as that of the first embodiment, the same reference numerals are used for the respective components.

As shown in FIG. 15, in this embodiment, only some of the LEDs 11 (reference symbols L1 to L6) are turned on among a plurality of LEDs 11 (reference symbols L1 to L12) arranged side by side in an annular shape.
In this case, according to the light source device 3 of the present embodiment, as shown in FIG. 16, as in the first embodiment described above, the rotary motor 13 while facing the LEDs to be lit (reference characters L1 to L6). And the light emission time of the LEDs to be turned on (reference numerals L1 to L6) are lengthened. Thereby, the light quantity of the superimposing light inject | emitted from the light guide member 12 can be increased compared with the conventional light source device shown in FIG.

  Moreover, as shown in FIG. 17, it is good also as increasing the rotational speed of the rotary motor 13 between opposing LED (code | symbol L7-L12) which is not made to light similarly to the above-mentioned 2nd Embodiment. Thereby, the light quantity of the superimposing light inject | emitted from the light guide member 12 can be increased compared with the conventional light source device shown in FIG.

As mentioned above, although each embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention. .
For example, in the first embodiment, the calculation unit 17 has been described as calculating the rotation speed of the rotation motor 13 and the light emission time of the LED 11, but instead of this, the chromaticity of the superimposed light and the rotation speed of the rotation motor 13 are described. Further, the light emission time of the LED 11 may be stored in advance in association with each other. Thereby, the rotational speed of the rotary motor 13 and the light emission time of the LED 11 can be determined according to the chromaticity of the superimposed light desired by the user.

  Moreover, in the first embodiment and the second embodiment, the example in which the white light is emitted by superimposing the illumination light from the green LED, the blue LED, and the red LED has been described, but depending on the use of the light source device It is good also as changing the ratio of the illumination light from each LED. For example, when the light source device of the present invention is applied to an endoscope system, special light observation may be performed by increasing the ratio of illumination light from a green LED or a blue LED.

  In addition, it has been described that the light emission time of each LED 11 is controlled so as to minimize the extinguishing period while the incident surface 20 of the light guide member 12 faces the LED 11, but it is not always necessary to minimize it. The total amount of illumination light incident on the light guide member 12 during the period may be increased.

It is a schematic block diagram of the light source device which concerns on each embodiment of this invention. It is a figure explaining arrangement | positioning of LED of the light source device of FIG. It is a figure explaining the relationship between the light emission magnification of LED, and Duty. It is a flowchart which shows operation | movement of the light source device of FIG. It is a flowchart which shows operation | movement of the light source device of FIG. It is a flowchart which shows operation | movement of the light source device of FIG. It is a flowchart which shows operation | movement of the light source device of FIG. It is a flowchart which shows operation | movement of the light source device of FIG. It is a flowchart which shows operation | movement of the light source device of FIG. It is a flowchart which shows operation | movement of the light source device of FIG. It is a timing chart of the light source device of FIG. It is a flowchart which shows operation | movement of the light source device which concerns on 2nd Embodiment. It is a flowchart which shows operation | movement of the light source device which concerns on 2nd Embodiment. It is a timing chart of the light source device of FIG. 12 and FIG. It is a figure explaining arrangement | positioning of LED of the light source device which concerns on 3rd Embodiment. It is a timing chart of the light source device of FIG. It is a timing chart of the light source device of FIG. It is a timing chart of the conventional light source device. It is a timing chart of the conventional light source device.

Explanation of symbols

1, 2, 3 Light source device 11 LED (light source)
12 Light guide member (light guide part)
13 Rotating motor (rotating part)
14 Rotation sensor 15 Chromaticity sensor (detection unit)
16 Setting part 17 Calculation part 18 Rotation control part 19 Light source control part 20 Incident surface 21 Light guide rod 22 Prism 23 Lens 27 Luminous magnification calculation part 0 Center axis L1-L6 Green LED
L7 ~ L9 Blue LED
L10 to L12 Red LED

Claims (5)

A plurality of light sources arranged in an annular shape and emitting illumination light of at least two types of wavelength components radially inward of the ring;
A light guide unit that is arranged with an incident surface on which illumination light emitted from the light source is incident facing radially outward of the ring, and guides the incident illumination light in a direction along the central axis of the ring When,
A rotating unit that rotationally drives the light guide unit around the central axis;
A setting unit for setting a wavelength component ratio of light emitted from the light guide unit;
The wavelength component ratio of the light obtained by the total amount of time that the incident surface of the light guide unit faces the light source that emits each wavelength component is the same as the wavelength component ratio set by the setting unit. A rotation control unit for controlling the rotation speed of the rotating unit;
A light source device comprising: a light source control unit that determines a light emission time of the light source according to a time when the incident surface of the light guide unit faces, and causes the light source to emit light at a timing when the incident surface of the light guide unit faces.   In the rotation control unit, the incident surface of the light guide unit approaches a specific light source that emits illumination light necessary to set the light emitted from the light guide unit to the wavelength component ratio set by the setting unit. The light source device according to claim 1, wherein the rotation speed of the rotating unit is reduced.   The said light source control part lengthens the light emission time of the specific light source which inject | emits illumination light required in order to make the light inject | emitted from the said light guide part into the wavelength component ratio set by the said setting part. Item 3. The light source device according to Item 2. A detection unit for detecting a wavelength component ratio of light emitted from the light guide unit;
2. A calculation unit that calculates a rotation speed of the rotation unit and a light emission time of the light source so that the wavelength component ratio detected by the detection unit matches the wavelength component ratio set by the setting unit. The light source device according to claim 3.   The calculation unit calculates a rotation speed of the rotation unit and a light emission time of the light source so as to minimize a light extinguishing period of the light source while the light guide unit faces the light source. The light source device described.

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