Light source device for endoscope and endoscope system

Abstract

The light source device for an endoscope of the present application has: a case which can be connected to a light guide of an endoscope; a first light source which is disposed in the case and which emits light of a first wavelength band; a second light source which is disposed in the case and which emits light of a second wavelength band different from the first wavelength band; a combining section which combines the light emitted by the first light source and the light emitted by the second light source; a diffusing section which is provided between the combining section and an incident end of the light guide connected to the case, and which diffuses a part of the light combined by the combining section to the outside of the light path toward the light guide; a light quantity sensor which is provided outside the light path to the light guide, and which detects the light quantity of at least a part of the light diffused by the diffusing section; and an illumination control section which controls the light quantity of the light emitted by at least one of the first light source and the second light source, based on the result detected by the light quantity sensor.

Description

TECHNICAL FIELD

[0001] The present application relates to an endoscope light source device and an endoscope system. BACKGROUND

[0002] In the past, in the medical field, an endoscope system has been used in order to observe the inside of an object. An endoscope is generally inserted into an object such as a patient in an elongated flexible insertion section, and the inside of the object is illuminated with illumination light from the tip of the insertion section. A light source device that supplies the illumination light is connected to the endoscope.

[0003] In the endoscope system, in order to stably irradiate the illumination light, the light quantity of the illumination light is controlled with respect to the change in the light quantity of the illumination light caused by the change over time of the light source in the light source device and the optical member. In order to detect the light quantity of the illumination light emitted from the light source device, it is known that a part of the illumination light is taken in by an optical fiber, and a sensor detects the taken-in light (for example, refer to Patent Literature 1). In addition, it is known that a part of the light about to be emitted from the light source device is reflected, and the light deviated from the optical path by the reflection is detected (for example, refer to Patent Literatures 2 and 3).

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent No. 5909091

[0007] Patent Literature 2: Japanese Patent Application Laid-Open No. 2011-165607

[0008] Patent Literature 3: International Publication No. 2010 / 100898 SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] However, in the technology described in Patent Literature 1, an optical fiber must be provided in the optical path of the illumination light, and the optical system that guides the illumination light can be large-sized. In addition, in the technologies described in Patent Literatures 2 and 3, an optical structure for reflecting a part of the illumination light is required, and the optical system that guides the illumination light can be large-sized.

[0011] The present application has been achieved in view of the above-described circumstances, and an object thereof is to provide an endoscope light source device that can suppress a large size and detect the light quantity of illumination light.

[0012] MEANS FOR SOLVING THE PROBLEMS

[0013] To solve the above problems, the endoscope light source device of the present application is characterized in that it comprises: a box capable of being connected to a light guide of an endoscope; a first light source disposed in the box and emitting light of a first wavelength band; a second light source disposed in the box and emitting light of a second wavelength band different from the first wavelength band; a combining section that combines the light emitted by the first light source and the light emitted by the second light source; a diffusion section provided between the combining section and an incident end of the light guide connected to the box, and diffusing a portion of the light combined by the combining section to the outside of a light path incident to the light guide; a light quantity sensor provided outside the light path incident to the light guide and detecting the light quantity of at least a portion of the light diffused by the diffusion section; and an illumination control section that controls the light quantity of the light emitted by at least one of the first light source and the second light source based on the result detected by the light quantity sensor.

[0014] In addition, the endoscope light source device of the present application is characterized in that, in the above-mentioned application, the endoscope light source device further comprises a condenser lens, the light combined by the combining section is incident to the condenser lens, and the condenser lens converges the incident light to the incident end of the light guide, and the diffusion section is provided at a portion of the condenser lens.

[0015] Furthermore, the endoscope light source device of the present application is characterized in that, in the above-mentioned application, the light quantity sensor detects the light quantity of the light of the first wavelength band and the light quantity of the light of the second wavelength band in the light diffused by the diffusion section, respectively.

[0016] In addition, the endoscope light source device of the present application is characterized in that, in the above-mentioned application, the diffusion section is disposed at a position on the outer circumferential side than the optical axis center of the condenser lens.

[0017] In addition, the endoscope light source device of the present application is characterized in that, in the above-mentioned application, the diffusion section is disposed at a position including the optical axis center of the condenser lens.

[0018] In addition, the endoscope light source device of the present application is characterized in that, in the above-mentioned application, the endoscope light source device further comprises: a condenser lens, the light combined by the combining section is incident to the condenser lens, and the condenser lens converges the incident light to the incident end of the light guide; and a transmission member provided between the combining section and the condenser lens, having light transmission property, and the diffusion section is provided at a portion of the transmission member.

[0019] Further, the light source device for an endoscope according to the present application is characterized in that the light source device for an endoscope according to the above-mentioned application further comprises: a condenser lens, the light synthesized by the combining section is incident to the condenser lens, and the condenser lens condenses the incident light to the incident end of the light guide; and a lens holder that holds the condenser lens, the diffusing section being held to the lens holder.

[0020] Further, the light source device for an endoscope according to the present application is characterized in that the light source device for an endoscope according to the above-mentioned application further comprises: a condenser lens, the light synthesized by the combining section is incident to the condenser lens, and the condenser lens condenses the incident light to the incident end of the light guide; and a lens holder that holds the condenser lens, the diffusing section being held to the lens holder.

[0021] Further, the light source device for an endoscope according to the present application is characterized in that the light source device for an endoscope according to the above-mentioned application further comprises: a condenser lens, the light synthesized by the combining section is incident to the condenser lens, and the condenser lens condenses the incident light to the incident end of the light guide; and a lens holder that holds the condenser lens, the diffusing section being held to the lens holder.

[0022] Further, the light source device for an endoscope according to the present application is characterized in that the light source device for an endoscope according to the above-mentioned application further comprises: a condenser lens, the light synthesized by the combining section is incident to the condenser lens, and the condenser lens condenses the incident light to the incident end of the light guide; and a lens holder that holds the condenser lens, the diffusing section being held to the lens holder.

[0023] Further, the light source device for an endoscope according to the present application is characterized in that the light source device for an endoscope according to the above-mentioned application further comprises: a condenser lens, the light synthesized by the combining section is incident to the condenser lens, and the condenser lens condenses the incident light to the incident end of the light guide; and a lens holder that holds the condenser lens, the diffusing section being held to the lens holder.

[0024] Further, the light source device for an endoscope according to the present application is characterized in that the light source device for an endoscope according to the above-mentioned application further comprises: a condenser lens, the light synthesized by the combining section is incident to the condenser lens, and the condenser lens condenses the incident light to the incident end of the light guide; and a lens holder that holds the condenser lens, the diffusing section being held to the lens holder.

[0025] Effects of the Invention

[0026] According to the present application, it is possible to detect the light quantity of the illumination light while suppressing the increase in size. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 FIG. 1 is a diagram showing the schematic configuration of an endoscope system according to Embodiment 1 of the present application.

[0028] Figure 2 FIG. 2 is a block diagram showing the outline configuration of the endoscope system according to Embodiment 1 of the present application.

[0029] Figure 3 FIG. 1 is a diagram illustrating a structure of a light source device of an endoscope system according to Embodiment 1 of the present application.

[0030] Figure 4 FIG. 2 is a diagram illustrating a structure of a connecting portion with a light guide in the light source device.

[0031] Figure 5 FIG. 3 is a plan view of a vicinity of a condenser lens in the light source device, viewed from a light axis direction.

[0032] Figure 6 FIG. 4 is a diagram illustrating a structure of a connecting portion with a light guide in a light source device of a variation of Embodiment 1 of the present application.

[0033] Figure 7 FIG. 5 is a diagram illustrating a structure of a connecting portion with a light guide in a light source device of another variation of Embodiment 1 of the present application.

[0034] Figure 8 FIG. 6 is a diagram illustrating a structure of a connecting portion with a light guide in a light source device of Embodiment 2 of the present application.

[0035] Figure 9 FIG. 7 is a plan view of a vicinity of a condenser lens in the light source device of Embodiment 3 of the present application, viewed from a light axis direction.

[0036] Figure 10 FIG. 8 is a diagram illustrating a structure of a connecting portion with a light guide in a light source device of Embodiment 4 of the present application.

[0037] Figure 11 FIG. 9 is a plan view of a vicinity of a condenser lens in the light source device of Embodiment 4 of the present application, viewed from a light axis direction.

[0038] Figure 12 FIG. 10 is a diagram illustrating a structure of a light source device of an endoscope system according to Embodiment 5 of the present application.

[0039] Figure 13 FIG. 11 is a diagram illustrating a structure of a connecting portion with a light guide in the light source device of Embodiment 5 of the present application.

[0040] Figure 14 FIG. 12 is a diagram illustrating a structure of a light source device of an endoscope system according to Embodiment 6 of the present application. DETAILED DESCRIPTION

[0041] Hereinafter, a mode for carrying out the present application (hereinafter, referred to as "embodiment") will be described. In the embodiment, as an example of a system including the light source device for an endoscope of the present application, an endoscope system for medical use that captures and displays an image of an inside of a patient or the like will be described. In addition, the present application is not limited to this embodiment. Also, in the description of the drawings, the same reference numerals are attached to the same parts to describe them.

[0042] (Embodiment 1)

[0043] Figure 1 is a diagram showing a schematic structure of an endoscope system of Embodiment 1 of the present application. Figure 2 is a block diagram showing a schematic structure of the endoscope system of the present embodiment 1.

[0044] Figure 1 and Figure 2 The endoscope system 1 shown in FIG. 1 has an endoscope 2 that captures an in-vivo image of a subject by inserting a distal end portion into the subject, a light source device 3 that generates illumination light emitted from the distal end of the endoscope 2, a processing device 4 that performs prescribed signal processing on an imaging signal captured by the endoscope 2 and that controls the operation of the entire endoscope system 1, and a display device 5 that displays an in-vivo image generated by the signal processing of the processing device 4.

[0045] The endoscope 2 has an insertion portion 21 that has an elongated shape and that has flexibility, an operation portion 22 that is connected to a proximal end side of the insertion portion 21 and that receives input of various operation signals, and a general-purpose cable 23 that extends from the operation portion 22 in a direction different from the direction in which the insertion portion 21 extends, and that has various cables connected to the light source device 3 and the processing device 4 built therein.

[0046] The insertion portion 21 has a distal end portion 24 that has a CCD 244 in which pixels that generate signals by receiving light and performing photoelectric conversion are arranged in a two-dimensional shape, a bendable bending portion 25 that is composed of a plurality of bending pieces, and an elongated flexible tube portion 26 that is connected to a proximal end side of the bending portion 25 and that has flexibility. The insertion portion 21 is inserted into a body lumen of a subject, and a subject such as a living body tissue located at a position where external light does not reach is captured by the CCD 244.

[0047] The distal end portion 24 has a light guide 241 that is composed of a glass fiber or the like and that constitutes a light guide path of light emitted from the light source device 3, an illumination lens 242 that is provided at a distal end of the light guide 241, a converging optical system 243, and a CCD 244 (imaging portion) that is provided at an imaging position of the optical system 243, that receives light converged by the optical system 243 and photoelectrically converts it into an electric signal, and that performs prescribed signal processing.

[0048] The optical system 243 is configured using one or more lenses, has an optical zoom function that changes the angle of view and a focus function that changes the focus.

[0049] The imaging element 244 generates an electric signal (image signal) by photoelectrically converting light from the optical system 243. Specifically, the imaging element 244 has: a light-receiving portion 244a in which a plurality of pixels each having a photodiode that accumulates electric charges corresponding to the amount of light, a capacitor that converts the electric charges transferred from the photodiode into a voltage level, and the like are arranged in a matrix, each pixel generating an electric signal by photoelectrically converting light from the optical system 243; and a readout portion 244b that sequentially reads out the electric signal generated by the pixel arbitrarily set as a readout target among the plurality of pixels of the light-receiving portion 244a and outputs it as an image signal. The imaging element 244 is implemented using, for example, a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor.

[0050] In addition, the endoscope 2 has a memory (not shown) that stores an execution program and a control program for the imaging element 244 to perform various actions, and data containing identification information of the endoscope 2. The identification information contains inherent information (ID) of the endoscope 2, a model year, specification information, and a transmission method, and the like. In addition, the memory can temporarily store image data and the like generated by the imaging element 244.

[0051] The operation portion 22 has a bending knob 221 that bends the bending portion 25 in the up-down direction and the left-right direction, a treatment instrument insertion portion 222 that inserts a biopsy forceps, an electrosurgical knife, an examination probe, and the like into the body cavity of the subject, and a plurality of switches 223 as operation input portions that input operation instruction signals of a surrounding device such as a gas feeding unit, a water feeding unit, and a screen display control, in addition to the processing device 4. The treatment instrument inserted from the treatment instrument insertion portion 222 is exposed from an opening portion (not shown) via a treatment instrument channel (not shown) of the distal end portion 24.

[0052] The general-purpose cable 23 has at least an optical waveguide 241 and a collection cable 245 that collects one or a plurality of signal lines. The general-purpose cable 23 branches at the end portion on the side opposite to the side connected to the operation section 22. A connector 231 that is detachable with respect to the light source device 3 and a connector 232 that is detachable with respect to the processing device 4 are provided at the branched end portion of the general-purpose cable 23. A portion of the optical waveguide 241 extends from the end portion of the connector 231. The general-purpose cable 23 propagates the illumination light emitted from the light source device 3 to the distal end portion 24 via the connector 231 (optical waveguide 241), the operation section 22, and the flexible tube portion 26. In addition, the general-purpose cable 23 transmits the image signal captured by the image pickup element 244 provided at the distal end portion 24 to the processing device 4 via the connector 232. The collection cable 245 includes a signal line for transmitting the image pickup signal, a signal line for transmitting a drive signal for driving the image pickup element 244, and a signal line for transmitting and receiving information including intrinsic information related to the endoscope 2 (image pickup element 244) and the like. In addition, in the present embodiment, a case where an electric signal is transmitted using a signal line is described, but an optical signal can also be transmitted, and the signal can also be transmitted between the endoscope 2 and the processing device 4 by wireless communication.

[0053] Next, the structure of the light source device 3 will be described. The light source device 3 includes a light source section 31, an illumination control section 32, and a light source driver 33. Figure 3 FIG. 1 is a diagram illustrating the structure of a light source device of an endoscope system according to Embodiment 1 of the present application.

[0054] The light source section 31 is configured using a plurality of light sources that emit a plurality of illumination lights having mutually different wavelength bands, a plurality of lenses, and the like, and emits illumination light including a prescribed wavelength band by driving each of the light sources. Specifically, the light source section 31 has a first light source 311V, a second light source 311B, a third light source 311G, a fourth light source 311A, a fifth light source 311R, a lens 312V that converges the violet light emitted by the first light source 311V, a lens 312B that converges the blue light emitted by the second light source 311B, a lens 312G that converges the green light emitted by the third light source 311G, a lens 312A that converges the amber light emitted by the fourth light source 311A, a lens 312R that converges the red light emitted by the fifth light source 311R, a first dichroic mirror 313V, a second dichroic mirror 313B, a third dichroic mirror 313G, a fourth dichroic mirror 313A, a fifth dichroic mirror 313R, a condenser lens 314 that converges the wavelength of the light emitted by each of the light sources and guides it to the optical waveguide 241, a light quantity sensor 315 that detects the amount of light of a portion of the light that has passed through the condenser lens 314, a rotary filter 316, and a diffusion section 317. Each of the light sources is implemented using an LED light source, a laser light source, or the like.

[0055] The first light source 311V emits light in the wavelength band of 380 to 420 nm (violet light).

[0056] The second light source 311B emits light in the wavelength band of 420 to 495 nm (blue light).

[0057] The third light source 311G emits light in the wavelength band of 495 to 570 nm (green light).

[0058] The fourth light source 311A emits light in the wavelength band of 590 to 620 nm (amber light).

[0059] The fifth light source 311R emits light in the wavelength band of 620 to 750 nm (red light).

[0060] The first light source 311V to the fifth light source 311R are constituted by an LED (Light Emitting Diode), an LD (Laser Diode), or a combination of an LED and an LD.

[0061] In addition, the above-described wavelength bands are examples, and depending on the type of light source, a light source in a wavelength band that partially overlaps with the wavelength of light emitted by another light source can also be used.

[0062] Each of the dichroic mirrors (313V, 314B, 314G, 314A, 314R) bends the light from the light sources and causes them to travel on the same optical axis, thereby combining the light. The combining section is constituted using the dichroic mirrors.

[0063] The first dichroic mirror 313V bends the wavelength band of light emitted by the first light source 311V and transmits light in other wavelength bands.

[0064] The second dichroic mirror 313B bends the wavelength band of light emitted by the second light source 311B and transmits light in other wavelength bands.

[0065] The third dichroic mirror 313G bends the wavelength band of light emitted by the third light source 311G and transmits light in other wavelength bands.

[0066] The fourth dichroic mirror 313A bends the wavelength band of light emitted by the fourth light source 311A and transmits light in other wavelength bands.

[0067] The fifth dichroic mirror 313R bends the wavelength band of light emitted by the fifth light source 311R and transmits light in other wavelength bands.

[0068] Furthermore, in Embodiment 1, as long as light in red, blue, and green is emitted, at least the second light source 311B, the third light source 311G, and the fifth light source 311R are provided. The lenses and the dichroic mirrors are provided in accordance with the light sources provided.

[0069] The rotating filter 316 has a hole portion 316a that passes the combined illumination light and a wavelength selection filter 316b that is used to select a wavelength band of light incident on the light guide 241. The rotating filter 316 is disposed between the first dichroic mirror 313V and the condenser lens 314, and under the control of the illumination control section 32, plugs or unplugs the hole portion 316a or the wavelength selection filter 316b with respect to the optical path of the illumination light by rotation of itself. The rotating filter 316, for example, in the case of fluorescence observation, in which the wavelength band of the excitation light to be irradiated to the subject is to be guided to the light guide 241, inserts the corresponding wavelength selection filter into the optical path.

[0070] Figure 4 is a view that explains the structure of the connection portion to the light guide in the light source device. Figure 5 is a plan view that observes the vicinity of the condenser lens in the light source device from the direction of the optical axis. The condenser lens 314 is held by a lens holder 3141 that is supported to the housing (box) of the light source device 3.

[0071] The light quantity sensor 315 has a first sensor 315A that has photosensitivity to the wavelength band of light emitted by the second light source 311B, the third light source 311G, and the fifth light source 311R, respectively, and a second sensor 315B that has photosensitivity to the wavelength band of light emitted by the first light source 311V, the third light source 311G, and the fourth light source 311A, respectively (refer to FIG. 6). The first sensor 315A and the second sensor 315B output each detection value (light quantity value) of light for each wavelength band to the illumination control section 32. In addition, the light quantity sensor 315 outputs the detection value of at least one of the first sensor 315A and the second sensor 315B to the illumination control section 32 with respect to the detection value of light emitted by the third light source 311G. Figure 5 ) to the illumination control section 32. In addition, the light quantity sensor 315 outputs the detection value of at least one of the first sensor 315A and the second sensor 315B to the illumination control section 32 with respect to the detection value of light emitted by the third light source 311G.

[0072] The light quantity sensor 315 is disposed so as not to be in the optical path (optical axis N L) overlapping position, and is disposed at a position on the light guide 241 side (downstream side of the optical path) of the condenser lens 314, and is disposed in the vicinity of the condenser lens 314. The light amount sensor 315 detects the light amount of a part of the light in which the light emitted from the first to fifth light sources 311V to 311R is combined. The first and second sensors 315A and 315B are held by a support member 3151 supported to the housing of the light source device 3. The first and second sensors 315A and 315B are configured using a sensor provided with a photodiode having photosensitivity to a waveband of an object, a CCD image sensor, and a CMOS image sensor. In the CCD image sensor and the CMOS image sensor used as the light amount sensor 315, a light filter that transmits light from each light source is disposed in front of a pixel. At this time, by using the CCD image sensor and the CMOS image sensor as the light amount sensor 315, it is possible to detect a change in the amount of light emitted in association with a change in the light amount distribution in detail. On the other hand, the sensor provided with the photodiode having photosensitivity to a waveband of an object can be configured inexpensively as compared with the case of using the CCD image sensor and the CMOS image sensor.

[0073] The diffusion portion 317 is provided to the condenser lens 314 to diffuse the incident light. The diffusion portion 317 is formed by surface processing of the condenser lens 314. The diffusion portion 317 is provided to the surface of the condenser lens 314 and is provided to the surface on the side on which the combining portion is provided, and thus is provided between the condenser lens 314 and the combining portion. The surface roughness of the diffusion portion 317 is rougher than the surface of the condenser lens other than the portion in which the diffusion portion 317 is formed.

[0074] The diffusion portion 317 is provided on the side opposite to the side on which the light guide 241 is provided, and on the side on which the light axis N L The light amount sensor 315 is provided in the emission range of the light emitted from the condenser lens 314 in which the light diffused by the diffusion portion 317 is emitted. That is, a part of the light diffused by the diffusion portion 317 is taken into the light amount sensor 315 via the condenser lens 314.

[0075] Here, the diffusion portion 317 is preferably provided so as to have an area of 2% or less of the effective diameter area of the condenser lens 314. By satisfying the above condition, it is possible to guide a sufficient amount of illumination light to the light guide 241 and diffuse the light for detection.

[0076] The light source driver 33 causes the light sources to emit light by supplying a current to each light source under the control of the illumination control portion 32.

[0077] In the light source section 31, the first light source 311V and the second light source 311B emit light to become blue illumination light, the third light source 311G emits light to become green illumination light, and the fourth light source 311A and the fifth light source 311R emit light to become red illumination light, and each colored illumination light is emitted.

[0078] Hereinafter, the red (R) illumination light, the green (G) illumination light, and the blue (B) illumination light are simply referred to as R illumination light, G illumination light, and B illumination light, respectively.

[0079] The illumination control section 32 controls the driving timing of each light source based on a control signal (dimming signal) from the control section 37. In addition, the illumination control section 32 performs feedback control of the amount of power supplied to each light source based on the detection values of light of each waveband acquired from the light amount sensor 315. The illumination control section 32 outputs, for example, an output value that makes the ratio of the light amounts of the light emitted from each light source a predetermined ratio. Furthermore, the illumination control section 32 can also determine the light amount of the G illumination light that makes the brightness of the image an appropriate value based on the correlation between the brightness of the green (G) component and the detection value of the G illumination light acquired from the light amount sensor 315, based on the image generated by the image processing section 41. In addition, the light amount that makes the brightness of the light amount each color component appropriate can also be determined based on the ratio of the detection value of the R illumination light with respect to the detection value of the G illumination light, and the ratio of the detection value of the B illumination light with respect to the detection value of the G illumination light.

[0080] Returning to Figure 2 The structure of the processing device 4 will be described. The processing device 4 is provided with an image processing section 41, a synchronization signal generation section 42, an input section 43, a control section 44, and a storage section 45.

[0081] The image processing section 41 receives image data of each color illumination light photographed by the imaging element 244 from the endoscope 2. The image processing section 41 generates a digital imaging signal by performing A / D conversion in a case where analog image data is received from the endoscope 2. Also, the image processing section 41 generates digital image data by performing photoelectric conversion in a case where image data is received as an optical signal from the endoscope 2.

[0082] The image processing section 41 generates an image by performing prescribed image processing on image data received from the endoscope 2 and outputs the image to the display device 5. Here, the prescribed image processing is simultaneous processing, gradation correction processing, color correction processing, and the like. The simultaneous processing is processing that makes the image data of each color component of RGB simultaneous. The gradation correction processing is processing that performs gradation correction on the image data. The color correction processing is processing that performs hue correction on the image data. The image processing section 41 generates processed imaging signals (hereinafter, also simply referred to as imaging signals) that include the in-vivo image generated by the above-described image processing. In addition, the image processing section 41 can also perform gain adjustment according to the brightness of the image. The image processing section 41 is constituted using a general-purpose processor such as a CPU (Central Processing Unit), various kinds of operation circuits such as an ASIC (Application Specific Integrated Circuit) that execute specific functions, and the like.

[0083] In addition, the image processing section 41 can also be constituted so as to have a frame memory that holds R image data, G image data, and B image data.

[0084] The synchronization signal generating section 42 generates a clock signal (synchronization signal) that becomes a reference for the operation of the processing device 4 and outputs the generated synchronization signal to the light source device 3, the image processing section 41, the control section 44, and the endoscope 2. Here, the synchronization signal generated by the synchronization signal generating section 42 includes a horizontal synchronization signal and a vertical synchronization signal.

[0085] Accordingly, the light source device 3, the image processing section 41, the control section 44, and the endoscope 2 operate in synchronization with each other using the generated synchronization signal.

[0086] The input section 43 is realized using a keyboard, a mouse, a switch, a touch panel, and the like and accepts the input of various kinds of signals such as an operation instruction signal that instructs the operation of the endoscope system 1. In addition, the input section 43 can also include a switch provided to the operation section 22, a movable terminal such as a tablet-type computer, and the like.

[0087] The control section 44 performs drive control of each of the structure sections including the imaging element 244 and the light source device 3, input / output control of information to / from each of the structure sections, and the like. The control section 44 refers to control information data (for example, a readout timing and the like) for photographing control stored in the storage section 45 and transmits a drive signal to the imaging element 244 via a prescribed signal line included in the collection cable 245. The control section 44 is constituted using a general-purpose processor such as a CPU, various kinds of operation circuits such as an ASIC that execute specific functions, and the like.

[0088] The storage section 45 stores various programs for causing the endoscope system 1 to operate, and data including various parameters required for the operation of the endoscope system 1 and the like. In addition, the storage section 45 stores identification information of the processing device 4. Here, the identification information includes inherent information (ID) of the processing device 4, year model, and specification information, and the like. In addition, the storage section 45 has an illumination information storage section 451 that stores information about the configuration of the light source of the light source device 3 and the like. In the illumination information storage section 451, for example, an emission pattern of the light source corresponding to a set light amount (in this case, the light amount of the illumination light emitted by the light source device 3) is stored.

[0089] In addition, the storage section 45 stores various programs including an image acquisition processing program for executing the image acquisition processing method of the processing device 4. The various programs can also be recorded in a computer-readable recording medium such as a hard disk, a flash memory, a CD-ROM, a DVD-ROM, a floppy disk, and the like, and widely circulated. Furthermore, the above-described various programs can also be acquired by downloading via a communication network. The communication network described here is realized by, for example, an existing public line network, a LAN (Local Area Network), a WAN (Wide Area Network), and the like, and can be wired or wireless.

[0090] The storage section 45 having the above structure is realized using a ROM (Read Only Memory) in which various programs and the like are installed in advance, and a RAM, a hard disk, and the like that store operation parameters, data, and the like of each process.

[0091] The display device 5 displays a display image corresponding to an image signal received from the processing device 4 (the image processing section 41) via the video cable. The display device 5 is constituted using a monitor such as a liquid crystal or an organic EL (Electro Luminescence).

[0092] In the above-described embodiment 1, the diffusion section 317 that diffuses a part of the light incident on the condenser lens 314 is provided at a part of the condenser lens 314, and a part of the light diffused by the diffusion section 317 is taken into the light amount sensor 315, and the light amount is detected by the light amount sensor 315. According to the present embodiment 1, by providing the diffusion section 317 at a part of the condenser lens 314, a part of the light is made to be incident on the light amount sensor 315 provided outside the optical path, and as a result, it is possible to detect the light amount of the illumination light while suppressing the increase in size.

[0093] (Modified example 1 of embodiment 1)

[0094] Next, the modified example 1 of the embodiment 1 of the present application will be described with reference to Figure 6 The modified example 1 of the embodiment 1 of the present application will be described. Figure 6This diagram illustrates the structure of the connection portion with the light guide in the light source device of the endoscope system according to a variation of Embodiment 1 of the present invention. The endoscope system of this variation 1 has the same structure except for changing the placement of the diffuser 317 in the endoscope system 1 described above. Hereinafter, the diffuser 317A, whose structure differs from that of Embodiment 1, will be described.

[0095] A diffuser portion 317A, like diffuser portion 317, is disposed between the condenser lens 314 and the beam combiner to diffuse the incident light. The diffuser portion 317A is formed by surface machining of the condenser lens 314. Furthermore, the diffuser portion 317A is disposed on the opposite side of the condenser lens 314 to the side opposite to the light guide 241, and is positioned on the optical axis N of the illumination optical system including the condenser lens 314. L The center of the lens through which it passes. In this modified example 1, a portion of the light diffused by the diffuser 317A is also captured by the condenser lens 314 and taken into the light sensor 315.

[0096] In Modification 1 described above, similar to Embodiment 1, a diffusion section 317A is provided in a portion of the condenser lens 314 to diffuse a portion of the light incident on the condenser lens 314. A portion of the light diffused by the diffusion section 317A is taken into the light intensity sensor 315, and the light intensity sensor 315 detects the light intensity. According to this Modification 1, by simply providing a diffusion section 317A in a portion of the condenser lens 314, a portion of the light can be incident on the light intensity sensor 315 located outside the optical path. As a result, the light intensity of the illumination light can be detected while suppressing the increase in size.

[0097] Furthermore, in Modification 1, since the diffuser 317A is disposed at the center of the lens, alignment is not required when mounting the condenser lens 314 onto the lens holder 3141, and the condenser lens 314 can be easily mounted onto the lens holder 3141. On the other hand, in Embodiment 1, the diffuser 317 is disposed at a position offset from the center of the lens, therefore, when mounting the condenser lens 314 onto the lens holder 3141, the position of the diffuser 317 around the central axis of the lens needs to be aligned.

[0098] (Modification 2 of Implementation Method 1)

[0099] Next, refer to Figure 7 A variation of Embodiment 1 of the present invention, Example 2, will be described. Figure 7 This diagram illustrates the structure of the connection portion with the light guide in the light source device of the endoscope system of Modified Example 2 of Embodiment 1 of the present invention. The endoscope system of Modified Example 2 has the same structure as described above, except for the change in the placement position of the diffuser 317 in Endoscope System 1. Hereinafter, the diffuser 317B, whose structure differs from that of Embodiment 1, will be described.

[0100] Diffuser 317B, like diffuser 317, is disposed between condenser lens 314 and wave combiner to diffuse incident light. Diffuser 317B is formed by surface machining of condenser lens 314. Furthermore, diffuser 317B is disposed on the side of condenser lens 314 opposite to light guide 241, and is positioned along the optical axis N of the illumination optical system including condenser lens 314. L The offset position. Additionally, similar to Modified Example 1, the diffuser 317B can also be positioned on the optical axis N of the illumination optical system including the condenser lens 314. L The center of the lens through which it passes. In this modified example 2, a portion of the light diffused by the diffuser 317B is also captured by the light intensity sensor 315.

[0101] In Modification 2 described above, similar to Embodiment 1, a diffuser 317B is provided in a portion of the condenser lens 314 to diffuse a portion of the light incident on the condenser lens 314. A portion of the light diffused by the diffuser 317B is captured by the light intensity sensor 315, and the light intensity sensor 315 detects the light intensity. According to this Modification 2, by simply providing a diffuser 317B in a portion of the condenser lens 314, a portion of the light can be incident on the light intensity sensor 315 located outside the optical path. As a result, the light intensity of the illumination light can be detected while suppressing the increase in size.

[0102] Furthermore, according to Modification 2, compared with the structure using diffuser sections 317 and 317A, light is scattered at a position close to the light sensor 315, so light can be guided to the sensor more efficiently than in Embodiment 1.

[0103] (Implementation Method 2)

[0104] Next, refer to Figure 8 Embodiment 2 of the present invention will be described. Figure 8 This diagram illustrates the structure of the connection portion with the light guide in the light source device of the endoscope system according to Embodiment 2 of the present invention. The endoscope system of Embodiment 2 is identical in structure to the endoscope system 1 described above, except for the change in the placement of the diffuser 317. Hereinafter, the diffuser 317C, whose structure differs from that of Embodiment 1, will be described.

[0105] Diffusion portion 317C is formed on optical axis N. L A retaining member 3171 is disposed adjacent to the condenser lens 314 in the direction of light transmission. The retaining member 3171 is made of a material with high light transmittance, such as glass. The retaining member 3171 is equivalent to a light-transmitting member.

[0106] The diffusion portion 317C is formed by surface processing the holding member 3171. The diffusion portion 317C is formed on one side or both sides of the holding member 3171. The holding member 3171 is provided on the side opposite to the side of the condenser lens 314 that faces the light guide 241. Since the holding member 3171 is provided between the condenser lens 314 and the wave combining portion, the diffusion portion 317C is located between the condenser lens 314 and the wave combining portion. In addition, when the holding member 3171 is provided in the light source device 3, the diffusion portion 317C is provided on the side of the optical axis N L deviated position. In addition, as in Modification 1, the diffusion portion 317B can be provided on the optical axis N L passing through the lens center. In the present embodiment 2, a part of the light diffused by the diffusion portion 317C is also taken into the light quantity sensor 315 via the condenser lens 314.

[0107] In the above-described embodiment 2, the holding member 3171 provided adjacent to the condenser lens 314 is provided with the diffusion portion 317C that diffuses a part of the light incident on the condenser lens 314, and a part of the light diffused by the diffusion portion 317C is taken into the light quantity sensor 315, and the light quantity is detected by the light quantity sensor 315. According to the present embodiment 2, by providing the diffusion portion 317C in a part of the holding member 3171, it is possible to cause a part of the light to be incident on the light quantity sensor 315 provided outside the optical path, and as a result, it is possible to detect the light quantity of the illumination light while suppressing the increase in size.

[0108] In addition, in the present embodiment 2, since the diffusion portion 317C is formed on a member (the holding member 3171) different from the condenser lens 314, it is easy to provide the diffusion portion in the optical path compared to the case where the condenser lens 314 is directly processed.

[0109] (Embodiment 3)

[0110] Next, the structure of the light source device of the endoscope system according to the present embodiment 3 will be described with reference to FIG. 17. Figure 9 The present embodiment 3 will be described. Figure 9 is a view that illustrates the structure of the connection portion with the light guide in the light source device of the endoscope system according to the present embodiment 3. The endoscope system of the present embodiment 3 is the same structure as the above-described endoscope system 1 except that the diffusion portion 317 of the above-described endoscope system 1 is replaced with the diffusion portion 317A of Modification 1, and the structure of the light quantity sensor 315 is changed. Hereinafter, the light quantity sensor 318 whose structure is different from that of the present embodiment 1 and Modification 1 will be described.

[0111] The light quantity sensor 318 has a first sensor 318V, a second sensor 318B, a third sensor 318G, a fourth sensor 318A, and a fifth sensor 318R. The light quantity sensor 318 is held by the lens holder 3141.

[0112] The first sensor 318V has photosensitivity to light of a waveband emitted by the first light source 311V.

[0113] The second sensor 318B has photosensitivity to light of a waveband emitted by the second light source 311B.

[0114] The third sensor 318G has photosensitivity to light of a waveband emitted by the third light source 311G.

[0115] The fourth sensor 318A has photosensitivity to light of a waveband emitted by the fourth light source 311A.

[0116] The fifth sensor 318R has photosensitivity to light of a waveband emitted by the fifth light source 311R.

[0117] The first sensor 318V to the fifth sensor 318R are disposed at positions on the light guide 241 side (downstream side of the optical path) of the condenser lens 314, and on the outer peripheral side of the condenser lens 314 when viewed in the direction of the optical axis N. L The distance between each sensor and the diffusion portion 317A can be set to the same distance, or can be set to a distance set in accordance with a representative value of the waveband emitted by each light source.

[0118] In addition, the light receiving surface of each of the first sensor 318V to the fifth sensor 318R is orthogonal to the radial direction of the condenser lens 314. That is, each light receiving surface of the first sensor 318V to the fifth sensor 318R faces toward the center of the condenser lens 314.

[0119] In Embodiment 3 described above, the diffusion portion 317A that diffuses a portion of light incident on the condenser lens 314 is provided at a portion of the condenser lens 314, and a portion of light diffused by the diffusion portion 317A is taken into the light quantity sensor 318, and the light quantity is detected by the light quantity sensor 318. According to Embodiment 3, by providing the diffusion portion 317A at a portion of the condenser lens 314, it is possible to cause a portion of light to be incident on the light quantity sensor 318 provided outside the optical path, and as a result, it is possible to detect the light quantity of the illumination light while suppressing an increase in size.

[0120] In addition, in Embodiment 3, the first sensor 318V to the fifth sensor 318R respectively detect light diffused by the diffusion portion 317A for each waveband, and therefore it is possible to realize each sensor by providing a filter that transmits light of the waveband of the detection object in the same monochromatic photodiode, and it is possible to manufacture at a relatively low cost.

[0121] (Embodiment 4)

[0122] Next, the embodiment 4 of the present application will be described with reference to Figure 10 and Figure 11 The embodiment 4 of the present application will be described. Figure 10 is a view illustrating the structure of the connection portion with the light guide in the light source device of the endoscope system of the embodiment 4 of the present application. Figure 11 is a plan view of the vicinity of the condenser lens in the light source device of the endoscope system of the embodiment 4 of the present application, as viewed from the optical axis direction. The endoscope system of the embodiment 4 is the same structure as the above-described embodiment 3 except for the arrangement of the respective sensors of the light quantity sensor 318. Hereinafter, the arrangement of the light quantity sensor 318 which is different from the embodiment 3 will be described.

[0123] The first to fifth sensors 318V to 318R are held by the holding member 3181 provided at the position of the light guide 241 side (downstream side of the optical path) of the condenser lens 314. Each sensor held by the holding member 3181 is provided at the outer peripheral side of the condenser lens 314 when viewed from the optical axis N direction (refer to L ). Figure 11

[0124] In addition, the light receiving surface of each of the first to fifth sensors 318V to 318R is orthogonal to the optical axis N L direction. That is, the light receiving surface of each of the first to fifth sensors 318V to 318R is opposed to the surface of the condenser lens 314.

[0125] In the above-described embodiment 4, the diffusion portion 317A which diffuses a part of the light incident to the condenser lens 314 is provided at a part of the condenser lens 314, and a part of the light diffused by the diffusion portion 317A is taken into the light quantity sensor 318, and the light quantity is detected by the light quantity sensor 318. According to the embodiment 4, by providing the diffusion portion 317A at a part of the condenser lens 314, it is possible to cause a part of the light to be incident to the light quantity sensor 318 provided outside the optical path, and as a result, it is possible to detect the light quantity of the illumination light while suppressing the increase in size.

[0126] In addition, in the embodiment 4, as in the embodiment 3, the light diffused by the diffusion portion 317A is individually detected by the first to fifth sensors 318V to 318R for each wavelength band, and therefore, each sensor can be realized by providing the light filter which transmits the wavelength band of the detection object light to the same single-color photodiode, and can be manufactured at a relatively low cost.

[0127] (Embodiment 5)

[0128] Next, the embodiment 5 of the present application will be described with reference to​Figure 12 and Figure 13 Embodiment 5 of the present application will be described. Figure 12 is a view that illustrates the structure of the light source device of the endoscope system of Embodiment 5 of the present application. Figure 13 is a view that illustrates the structure of the connecting portion with the light guide in the light source device of the endoscope system of Embodiment 5 of the present application. The endoscope system of Embodiment 5 is the same as the endoscope system 1 except that the light guide unit that diffuses the light diffused by the diffusion portion 317 is changed. Hereinafter, the structure of the light source device 3A that is different from that of Embodiment 1 will be described.

[0129] In the light source portion 31A of Embodiment 5, the optical fiber 319 is provided between the condenser lens 314 and the light amount sensor 315. The optical fiber 319 has an optical fiber portion 319a that guides light, an incident end 319b provided at one end of the optical fiber portion 319a to which the light diffused by the diffusion portion 317 is incident, and an emission end 319c provided at the other end of the optical fiber portion 319a that emits the light guided by the optical fiber portion 319a. The incident end 319b is provided on the light guide 241 side of the condenser lens 314 and at a position that deviates from the optical axis N of the illumination optical system including the condenser lens 314. The emission end 319c is provided opposite to the light receiving surface of the light amount sensor 315. A part of the light diffused by the diffusion portion 317 is incident to the optical fiber 319 after passing through the condenser lens 314. The light emitted from the emission end 319c via the optical fiber portion 319a is taken into each sensor (the first sensor 315A and the second sensor 315B) of the light amount sensor. In addition, the first sensor 315A and the second sensor 315B are arranged opposite to the light emission surface of the emission end 319c. A light splitting unit such as a prism can also be provided at the emission end 319c so that the light split thereby is incident to the first sensor 315A and the second sensor 315B. L deviates from the optical axis N of the illumination optical system including the condenser lens 314. The emission end 319c is provided opposite to the light receiving surface of the light amount sensor 315. A part of the light diffused by the diffusion portion 317 is incident to the optical fiber 319 after passing through the condenser lens 314. The light emitted from the emission end 319c via the optical fiber portion 319a is taken into each sensor (the first sensor 315A and the second sensor 315B) of the light amount sensor. In addition, the first sensor 315A and the second sensor 315B are arranged opposite to the light emission surface of the emission end 319c. A light splitting unit such as a prism can also be provided at the emission end 319c so that the light split thereby is incident to the first sensor 315A and the second sensor 315B.

[0130] In addition, the emission end 319c and the light amount sensor 315 are provided within the light shielding space 320 formed by the light shielding member, in a structure in which light from the outside does not enter. Furthermore, the incident end 319b is held by the lens holder 3141.

[0131] In Embodiment 5 described above, as in Embodiment 1, the diffusion portion 317 that diffuses a part of the light incident to the condenser lens 314 is provided at a part of the condenser lens 314, and a part of the light diffused by the diffusion portion 317 is taken into the light amount sensor 315 via the optical fiber 319, and the light amount is detected by the light amount sensor 315. According to Embodiment 5, by providing the diffusion portion 317 at a part of the condenser lens 314 on the optical path of the illumination light, it is possible to cause a part of the light to be incident to the light amount sensor 315 provided outside the optical path, and as a result, it is possible to detect the light amount of the illumination light while suppressing the increase in size.

[0132] Further, in Embodiment 5, the light fiber 319 is provided between the condenser lens 314 and the light quantity sensor 315 to guide a part of the diffused light, so that the light propagating between the condenser lens 314 and the light quantity sensor 315 can be more reliably incident on the light quantity sensor 315.

[0133] (Embodiment 6)

[0134] Next, referring to Figure 14 Embodiment 6 of the present application will be described. Figure 14 is a view illustrating the structure of the light source device of the endoscope system of Embodiment 6 of the present application. The endoscope system of Embodiment 6 is the same as the endoscope system 1 except for the arrangement of the diffusion section 317. Hereinafter, the light source section 31B of the light source device 3B different from Embodiment 1 will be described.

[0135] The light source section 31B has the first to fifth light sources 311V to 311R, the lenses 312V to 312R, the first to fifth dichroic mirrors 313V to 313R, the condenser lens 314, the light quantity sensor 315, the rotary filter 316A, and the diffusion section 317D.

[0136] The rotary filter 316A has a hole section 316a through which the combined illumination light passes, and a light-transmissive section 316c provided with the diffusion section 317D that diffuses a part of the illumination light. The light-transmissive section 316c is configured using a material having a high light transmittance, such as glass. The rotary filter 316A is provided between the first dichroic mirror 313V and the condenser lens 314, and plugs or unplugs the hole section 316a or the light-transmissive section 316c with respect to the light path of the illumination light by its own rotation under the control of the illumination control section 32. Since the rotary filter 316A is provided between the condenser lens 314 and the combining section, the diffusion section 317D is located between the condenser lens 314 and the combining section. Further, the rotary filter 316A can also have the wavelength-selective filter 316b described above. Further, in the case where the rotary filter 316A has the wavelength-selective filter 316b, it can also be configured to provide the diffusion section at the wavelength-selective filter 316b to detect the light quantity of the excitation light or the like. At this time, the diffusion section can be provided at a transmissive member provided overlapping the wavelength-selective filter 316b, or can be provided by machining a part of the wavelength-selective filter 316b.

[0137] When the light-transmissive section 316c is disposed on the light path, the diffusion section 317D is provided at a position deviated from the optical axis N L of the illumination optical system including the condenser lens 314. Further, as in Modification 1, the diffusion section 317D can also be provided at the optical axis NL The light diffused by the diffusion section 317D is also taken into the light quantity sensor 315 via the condenser lens 314.

[0138] In the above-described embodiment 6, the diffusion section 317D is provided to the rotary filter 316A, and a part of the light diffused by the diffusion section 317D is taken into the light quantity sensor 315, and the light quantity is detected by the light quantity sensor 315. According to the embodiment 6, by providing the diffusion section 317D to the rotary filter 316A in the light path of the illumination light, a part of the light can be made to be incident to the light quantity sensor 315 provided outside the light path, and as a result, the light quantity of the illumination light can be detected while suppressing the increase in size.

[0139] Further, in the embodiment 6, the diffusion section 317D is freely inserted and removed with respect to the light path by the rotary filter 316A, and thus, in the case where the light quantity detection is not required, the diffusion section 317D can be retracted from the light path. By retracting the diffusion section 317D from the light path, the illumination light after passing through the first dichroic mirror 313V can be made to be incident to the light guide 241 without leakage due to diffusion.

[0140] Further, in the above-described embodiment 6, an example in which a part of the light diffused by the diffusion section 317D is taken into the light quantity sensor 315 via the condenser lens 314 is described, but it can also be configured so as to be taken directly from the diffusion section 317D to the light quantity sensor 315 without passing through the condenser lens 314. In this case, for example, the diffusion section 317D is provided between the rotary filter 316A and the condenser lens 314.

[0141] Further, in the above-described embodiments 1 to 6, an example in which the light source device 3 and the processing device 4 are separate is described, but it can also be a structure in which the light source device 3 and the processing device 4 are integrated.

[0142] Further, in the above-described embodiments 1 to 6, an example in which the light quantity of the light of the object waveband is detected by a plurality of sensors is described, but it can also be configured so as to detect the light quantity of the white light by providing one light quantity sensor that receives the white light.

[0143] Further, in the above-described embodiments 1 to 4 and 6, it can also be configured so as to provide a light splitting unit such as a prism between the condenser lens 314 and the light quantity sensor, split the light of the waveband to be detected, and detect the split light by a plurality of sensors. If it is configured to split the light, by disposing monochromatic photodiodes at positions where the light of each waveband is split, the light quantity of the light of each waveband can be detected. At this time, as the photodiodes, the same kind of photodiodes are disposed at the split positions, respectively.

[0144] In addition, in the above-described embodiments 1 to 6, the endoscope system of the present application is described as the endoscope system 1 using the flexible endoscope 2 in which the observation object is a biological tissue or the like in a subject, but can also be applied to a rigid endoscope, an industrial endoscope in which the characteristics of an observation material are observed, or an endoscope system using an endoscope in which a camera head is connected to an eyepiece portion of a fiber scope, an optical view tube, or the like.

[0145] Industrial Applicability

[0146] As described above, the light source device for endoscope of the present application is useful in suppressing the increase in size while detecting the amount of light of the illumination light.

[0147] Explanation of Reference Signs

[0148] 1 Endoscope system

[0149] 2 Endoscope

[0150] 3, 3A, 3B Light source device

[0151] 4 Processing device

[0152] 5 Display device

[0153] 21 Insertion portion

[0154] 22 Operation portion

[0155] 23 Universal cable

[0156] 24 Distal end portion

[0157] 25 Curved portion

[0158] 26 Flexible tube portion

[0159] 31, 31A Light source portion

[0160] 32 Illumination control portion

[0161] 33 Light source driver

[0162] 41 Image processing portion

[0163] 42 Synchronous signal generation portion

[0164] 43 Input portion

[0165] 44 Control portion

[0166] 45 Storage portion

[0167] 311V First light source

[0168] 311B Second light source

[0169] 311G Third light source

[0170] 311A fourth light source

[0171] 311R fifth light source

[0172] 312V, 312B, 312G, 312A, 312R lenses

[0173] 313V first dichroic mirror

[0174] 313B second dichroic mirror

[0175] 313G third dichroic mirror

[0176] 313A fourth dichroic mirror

[0177] 313R fifth dichroic mirror

[0178] 314 condenser lens

[0179] 315 light amount sensor

[0180] 316, 316A rotating filter

[0181] 317, 317A to 317D diffusion sections

Claims

1. An endoscope light source device, comprising: The box is designed to connect to the light guide of the endoscope. A first light source, which is disposed inside the box, emits light of a first wavelength. A second light source is disposed inside the box and emits light of a second wavelength band that is different from the first wavelength band. The beam combiner combines the light emitted from the first light source and the light emitted from the second light source. A focusing lens is used to focus the light synthesized by the wave combiner onto the focusing lens, and the focusing lens focuses the incident light onto the incident end of the light guide connected to the box; A diffuser is disposed between the wave combiner and the incident end of the light guide, so that a portion of the light combined by the wave combiner diffuses to the outside of the light path into the light guide; A light intensity sensor is disposed on the light guide side of the condenser lens and located outside the light path into the light guide, and detects the light intensity of at least a portion of the light diffused by the diffuser. as well as The lighting control unit controls the amount of light emitted by at least one of the first light source and the second light source based on the result detected by the light quantity sensor.

2. The endoscope light source device according to claim 1, wherein, The diffuser is disposed on a portion of the condenser lens.

3. The endoscope light source device according to claim 1, wherein, The light sensor detects the light intensity of the first band and the light intensity of the second band in the light diffused by the diffuser.

4. The endoscope light source device according to claim 2, wherein, The diffuser is positioned on the outer periphery of the optical axis center of the condenser lens.

5. The endoscope light source device according to claim 2, wherein, The diffuser is positioned at the center of the optical axis containing the condenser lens.

6. The endoscope light source device according to claim 1, wherein, The endoscope light source device also has: A transmission component, disposed between the wave combiner and the condenser lens, is transparent. The diffuser is disposed on a portion of the transmission component.

7. The endoscope light source device according to claim 1, wherein, The endoscope light source device also has: Lens holder, which holds the condenser lens The light sensor is held in the lens holder.

8. The endoscope light source device according to claim 1, wherein, The endoscope light source device also has: A retaining component, disposed on the side connected to the light guide relative to the condenser lens, holds the light sensor.

9. The endoscope light source device according to claim 1, wherein, The light sensor is a sensor having a first filter that allows light of the first wavelength band to pass through and a second filter that allows light of the second wavelength band to pass through.

10. The endoscope light source device according to claim 1, wherein, The light sensor includes: A first sensor detects the amount of light in the first wavelength band; and The second sensor detects the amount of light in the second wavelength band.

11. The endoscope light source device according to claim 1, wherein, The endoscope light source device also includes an optical fiber into which at least a portion of the light diffused by the diffuser is incident. The light sensor is located at the light-emitting end of the optical fiber.

12. The endoscope light source device according to claim 1, wherein, The endoscope light source device also includes a rotating filter, which is disposed between the wave combiner and the incident end of the light guide. The diffuser is disposed on the rotating filter and can be inserted or removed relative to the optical path by rotating the rotating filter.

13. An endoscope system comprising: An endoscope is used to take internal images of a subject by inserting its tip into the body of the subject. A light source device that generates illumination light emitted from the tip of the endoscope; The processing device performs prescribed signal processing on the camera signals captured by the endoscope and uniformly controls the overall operation of the endoscope system; as well as A display device that displays an in vivo image generated by signal processing of the processing device. The light source device includes: A box that can be connected to the light guide of the endoscope, wherein the light guide directs light incident on the incident end to the front end of the insertion part; The first light source emits light in the first wavelength band; The second light source emits light in a second wavelength band that is different from the first wavelength band; The beam combiner combines the light emitted from the first light source and the light emitted from the second light source. A diffuser is disposed between the wave combiner and the incident end of the light guide, so that a portion of the light combined by the wave combiner diffuses to the outside of the light path into the light guide; A light intensity sensor, disposed outside the optical path into which the light is directed, detects the intensity of at least a portion of the light diffused by the diffuser; and The lighting control unit controls the amount of light emitted by at least one of the first light source and the second light source based on the result detected by the light quantity sensor.

Images