WO2019198293A1

WO2019198293A1 - Microscope system and medical light source device

Info

Publication number: WO2019198293A1
Application number: PCT/JP2019/001376
Authority: WO
Inventors: 高橋　祐一; 聡史長江; 智之大木
Original assignee: ソニー株式会社
Priority date: 2018-04-11
Filing date: 2019-01-18
Publication date: 2019-10-17

Abstract

[Problem] To provide a microscope system and a medical light source device which have good light utilization efficiency. [Solution] The microscope system is provided with a medical light source device and a microscope. The medical light source device is provided with: a broadband light source which emits broadband light having a wavelength band including a visible light range; a plurality of narrowband light sources which emit narrowband light having a wavelength band narrower than the broadband light; and an optical element having a dielectric multilayer onto which the broadband light and the narrowband light, emitted from each of the plurality of narrowband light sources and considered to have the same polarization direction, are incident. The microscope is connected with the medical light source device and guides the light emitted from the medical light source device.

Description

Microscope system and medical light source device

This technology relates to a microscope system and a medical light source device.

In the medical field, an endoscope system is known in which an inside (in vivo) of an observation target such as a person is imaged and the inside of the living body is observed. The endoscope system includes an endoscope inserted into a living body and a light source device (see, for example, Patent Document 1). An optical fiber that transmits light emitted from the light source device is provided in the endoscope, and light from the light source device that has passed through the endoscope is irradiated to the observation target portion from the distal end of the endoscope. The

In a medical observation system such as an endoscope system or a microscope system, diagnosis is performed using an image obtained by imaging an observation target portion illuminated with illumination light. The endoscope light source device of Patent Document 1 is configured to be able to combine white illumination light and narrowband light and emit as illumination light.

JP 2012-81133 A

For more accurate diagnosis, it is desirable to brighten the entire image.
In view of the circumstances as described above, an object of the present technology is to provide a microscope system and a medical light source device with high light use efficiency.

In order to achieve the above object, a microscope system according to an embodiment of the present technology includes a medical light source device and a microscope.
The medical light source device includes: a broadband light source that emits broadband light having a wavelength band including a visible region; a plurality of narrow band light sources that emit narrow band light having a narrower wavelength band than the broadband light; and a plurality of the narrow bands The narrow band light emitted from each light source and having the same polarization direction and an optical element including a dielectric multilayer film on which the broadband light is incident.
The microscope is connected to the medical light source device and guides output light from the medical light source device.

According to such a configuration, in the medical light source device, the plurality of narrow band lights have the same polarization direction and are incident on the optical element, so that the light use efficiency of the narrow band light is good. Thereby, the light quantity of the combined light formed by combining the incident narrowband light and broadband light with the optical element can be increased. Therefore, it is possible to increase the amount of light irradiated to the irradiated object.

In order to achieve the above object, a medical light source device according to an embodiment of the present technology includes a broadband light source, a plurality of narrow-band light sources, and an optical element.
The broadband light source emits broadband light having a wavelength band including a visible region.
The narrowband light source emits narrowband light having a narrower wavelength band than the broadband light.
The optical element includes a dielectric multilayer film that is emitted from each of the plurality of narrowband light sources and into which the narrowband light and the broadband light that are in the same polarization direction are incident.

According to such a configuration, a plurality of narrowband lights having the same polarization direction are incident on the optical element, so that the light use efficiency of the narrowband light is improved. Thereby, the light quantity of the combined light formed by combining the incident narrowband light and broadband light with the optical element can be increased.

The optical element may transmit a plurality of the narrowband light whose incident polarization directions are all P-polarized light and reflect the incident broadband light.

According to such a configuration, since the transmission wavelength band of P-polarized light is wider than the transmission wavelength band of S-polarized light, when combining with the narrow band light of P-polarized light, the narrow band light of P-polarized light is transmitted. It is preferable to dispose an optical element in this, and the light utilization efficiency of narrowband light is improved.

The optical element may reflect a plurality of the narrowband light whose incident polarization directions are all S-polarized light and transmit the incident broadband light.

According to such a configuration, since the reflection wavelength band of S-polarized light is wider than the reflection wavelength band of P-polarized light, when combining using S-polarized narrow band light, S-polarized narrow band light is reflected. It is preferable to arrange the optical elements in this manner, and the light utilization efficiency of narrowband light is improved.

The optical element may be a wavelength selection element.
As a result, light in which the narrow band light having the same polarization direction and the non-polarized broadband light are combined by the optical element is generated.

The optical element may be a polarization selection element.
As a result, the optical element generates light in which narrowband light having the same polarization direction and broadband light having a polarization that is orthogonal to the narrowband light are combined.

A first lens group that is positioned between the broadband light source and the optical element, collimates the incident broadband light, and emits the light toward the optical element, and between the narrow band light source and the optical element. A second lens group that collimates the plurality of narrow-band lights having the same polarization direction and is emitted toward the optical element; and the light from the optical element is incident; And a third lens group that emits as illumination light. The first lens group, the second lens group, and the third lens group have a refractive index Nd greater than 1.70 and 1.85. The glass material may be smaller and the Abbe number νd may be greater than 40 and less than 55.

The first lens group, the second lens group, and the third lens group may have an antireflection film having the same antireflection characteristics.
Since the first lens group, the second lens group, and the third lens group can be configured using the same glass material having the same refractive index and the same Abbe number, an antireflection film having the same characteristics is used for each glass material. Films can be formed and manufacturing efficiency is good.

The broadband light may be white light.
The narrowband light may be laser light.
The medical light source device may be configured to be connectable to a microscope or an endoscope.

As described above, according to the present technology, it is possible to obtain an endoscope system and a medical light source device in which a reduction in the amount of irradiation light is suppressed. Note that the effects described here are not necessarily limited, and may be any of the effects described in the present disclosure.

It is explanatory drawing for demonstrating typically an example of a structure of the endoscope system to which the medical light source device which concerns on 1st and 2nd embodiment of this technique is applied. It is a schematic diagram which shows one structural example of the medical light source device which concerns on 1st Embodiment. It is a figure which shows the characteristic of the dichroic mirror used for the medical light source device of FIG. It is a figure which shows the difference in the transmittance | permeability of the dichroic mirror in the wavelength band of blue light in the case where it does not consider the polarization direction of narrow-band light, and the case where it arranges to P polarization. It is a schematic diagram which shows one structural example of the medical light source device which concerns on 2nd Embodiment. It is a figure which shows the characteristic of the dichroic mirror used for the medical light source device of FIG. It is a schematic diagram which shows one structural example of the medical light source device which concerns on 3rd Embodiment. FIG. 8 is a partial view of the configuration shown in FIG. 7, which is a schematic diagram for explaining an optical system on an optical path of light from a narrow-band light source unit. FIG. 8 is a partial view of the configuration shown in FIG. 7, which is a schematic diagram for explaining an optical system on an optical path of light from a broadband light source. It is a schematic diagram which shows one structural example of the medical light source device which concerns on 4th Embodiment. FIG. 11 is a partial view of the configuration shown in FIG. 10, and is a schematic diagram for explaining an optical system on an optical path of light from a narrow-band light source unit. FIG. 11 is a partial view of the configuration shown in FIG. 10 and is a schematic diagram for explaining an optical system on an optical path of light from a broadband light source. It is a figure showing roughly the whole operation room system composition. It is a figure which shows the example of a display of the operation screen in a concentrated operation panel. It is a figure which shows an example of the mode of the surgery to which the operating room system was applied. It is a block diagram which shows an example of a function structure of the camera head shown in FIG. 15, and CCU. It is a figure which shows an example of a schematic structure of a microscope operation system. It is a figure which shows the mode of an operation using the microscope operation system shown in FIG.

Hereinafter, an endoscope system to which a medical light source device according to an embodiment of the present technology is applied will be described with reference to the drawings.

(First embodiment)
[Configuration of endoscope system]
An endoscope system 1 according to the present embodiment will be described with reference to FIG.
The endoscope system 1 is a system that is used in the medical field and observes the inside (in vivo) of an observation object such as a person. The endoscope system 1 includes an endoscope 2, a camera 4, a medical light source device 5 (hereinafter referred to as a light source device 5), and a light guide cable 6.

The endoscope 2 includes an insertion tube 21 that is inserted into a living body, an optical system 22, an objective lens 23, and a light guide 24. The endoscope 2 irradiates the observation target site 3 that is an irradiated body from the distal end of the insertion tube 21 with the irradiation light 7 supplied from the light source device 5.

The insertion tube 21 is hard or at least partly soft and has an elongated shape. A connection connector 25 is provided on the outer peripheral surface of the insertion tube 21 so as to protrude along the radial direction and to which the other end of the light guide cable 6 is connected.

The objective lens 23 is provided at the distal end inside the insertion tube 21 and condenses the subject image.
The optical system 22 is provided inside the insertion tube 21 and guides the subject image condensed by the objective lens 23 to the proximal end of the insertion tube 21.

The light guide 24 as a light guide is constituted by an optical fiber, for example. The light guide 24 is routed from the distal end to the proximal end side in the insertion tube 21 and further extends to be bent at a substantially right angle toward the connection connector 25 side.

In a state where the light guide cable 6 is connected to the connection connector 25, the light supplied from the light source device 5 is guided by the light guide cable 6 and the light guide 24, emitted from the distal end of the insertion tube 21, and observed in the living body. Irradiation toward the target region 3.

The light source device 5 is connected to one end of a light guide cable 6. The light source device 5 supplies light for irradiating the observation target portion 3 to the light guide cable 6. Details of the light source device 5 will be described later.

The light guide cable 6 has one end detachably connected to the light source device 5 and the other end detachably connected to the connection connector 25 of the insertion tube 21. The light guide cable 6 transmits light supplied from the light source device 5 from one end to the other end and supplies the light to the insertion tube 21.

The camera 4 is detachably connected to the proximal end of the insertion tube 21. The camera 4 has an image sensor (not shown) and images the observation target portion 3.

[Configuration of light source device]
FIG. 2 is a schematic diagram illustrating a configuration example of the light source device 5.
As shown in FIG. 2, the light source device 5 includes a broadband light source 51, a narrow-band light source unit 52, a dichroic mirror 53 as an optical element, a first collimating lens 54, a second collimating lens 55, And an optical lens 56. The first collimating lens 54 constitutes a first lens group. The condensing lens 56 constitutes a third lens group.

The light from the broadband light source 51 and the light from the narrow band light source unit 52 are incident on the dichroic mirror 53. The first collimating lens 54 is located between the broadband light source 51 and the dichroic mirror 53 on the optical path. The second collimating lens 55 is located between the narrow-band light source unit 52 and the dichroic mirror 53 on the optical path. The second collimating lens 55 constitutes a second lens group.
In addition, in the case where the lens is composed of a plurality of lenses, the lens group is also referred to as a lens group.

The broadband light source 51 is composed of a white LED (Light Emitting Diode) and emits broadband light having a wide wavelength band including the visible region, for example, white light in a band of 400 nm to 700 nm. This white light is unpolarized light. White light emitted from the broadband light source 51 is incident on the first collimating lens 54.

The narrow-band light source unit 52 includes

laser light sources

52R, 52G, 52B, and 52IR as a plurality of narrow-band light sources. These laser light sources emit narrowband light having a narrower wavelength band than broadband light.

The narrow-band light source unit 52 includes a red laser light source (hereinafter referred to as R light source) 52R, a green laser light source (hereinafter referred to as G light source) 52G, a blue laser light source (hereinafter referred to as B light source) 52B, and an infrared ray. A laser light source (hereinafter referred to as an IR light source) 52IR, an IR light source dichroic mirror 521, an R light source dichroic mirror 522, a G light source dichroic mirror 523, and a B light source dichroic mirror 524 are provided.
In the present embodiment, an example in which one IR light source, one R light source, one G light source, and one B light source are provided. However, the type of laser light source and the number of light sources of each color are not limited to this, and may be set as appropriate. it can.

The IR light source 52IR is, for example, two IR light sources that emit laser light in an infrared band of 790 nm to 820 nm with a center wavelength of 808 nm and laser light in an infrared band of 905 to 970 nm with a center wavelength of 940 nm.
The IR light source dichroic mirror 521 reflects light in the infrared band and transmits light of other wavelengths. Infrared light emitted from the IR light source 52IR is reflected by the IR light source dichroic mirror 521, sequentially passes through the

dichroic mirrors

522, 523, and 524, and enters the second collimating lens 55.

The R light source 52R emits laser light in the red band of 630 nm to 645 nm, for example, having a center wavelength of 638 nm. The R light source dichroic mirror 522 reflects light in the red band and transmits light of other wavelengths. The red light emitted from the R light source 52 R is reflected by the R light source dichroic mirror 522, sequentially passes through the

dichroic mirrors

523 and 524, and enters the second collimating lens 55.

The G light source 52G emits a laser beam in a green band of 515 nm to 540 nm with a center wavelength of 525 nm, for example. The G light source dichroic mirror 523 reflects light in the green band and transmits light of other wavelengths. The green light emitted from the G light source 52G is reflected by the G light source dichroic mirror 523, passes through the dichroic mirror 524, and enters the second collimating lens 55.

The B light source 52B emits a laser beam in a blue band of 435 nm to 465 nm with a center wavelength of 445 nm, for example. The dichroic mirror 524 for the B light source reflects blue band light and transmits light of other wavelengths. The blue light emitted from the B light source 52 B is reflected by the B light source dichroic mirror 524 and enters the second collimating lens 55.

White light can be generated by combining light respectively emitted from the R light source 52R, the G light source 52G, and the B light source 52B. By controlling the output intensity of each color (each wavelength), it is possible to adjust the white balance of the captured image and adjust the amount of emitted light.

The white light from the broadband light source 51 is collimated by passing through the first collimating lens 54 to become substantially parallel light, and enters the dichroic mirror 53 serving as a multiplexing unit.
Laser light, which is narrowband light of a plurality of different bands from the narrowband light source unit 52, is collimated by passing through the second collimating lens 55, becomes substantially parallel light, and enters the dichroic mirror 53.

In normal light observation, combined white light generated by combining white light from the broadband light source 51 and red laser light, green laser light, and blue laser light from the narrow-band light source unit 52 by the dichroic mirror 53 is generated. Is irradiated as irradiation light 7 toward the observation target region 3. White light is generated by using red, green, and blue laser lights, and the white light from the broadband light source 51 is combined, so that the combined white light can be made close to sunlight, thereby rendering the color rendering property. Will improve.

In special light observation, white light is not emitted from the broadband light source 51, but laser light in a predetermined wavelength band corresponding to special light observation is emitted from the narrow-band light source unit 52.

In special light observation, for example, by utilizing the wavelength dependency of light absorption in body tissue, blue light and green light, which are narrowband light compared to illumination light (ie white light) during normal light observation, are irradiated. As a result, so-called narrow band imaging (Narrow Band Imaging) is performed in which a predetermined tissue such as a blood vessel on the mucous membrane surface is imaged with high contrast.

Alternatively, in special light observation, autofluorescence observation in which an image is obtained by fluorescence generated by irradiating excitation light may be performed. Further, infrared light observation may be performed in which a substance having a change in absorbance in the infrared light region is expressed by color using two infrared light beams having different wavelength bands as irradiation light.

In the normal light / special light observation, similarly to the normal light observation, the combined white light is irradiated to the observation target part 3. At this time, the laser light of the predetermined wavelength band from the narrow band light source unit 52 is irradiated. The output is adjusted to an intensity suitable for autofluorescence observation, for example. Thereby, an image in which the normal light observation image and the special light observation image are superimposed is obtained.

In the present embodiment, all the laser beams from the narrow-band light source unit 52 are configured such that their polarization directions are aligned with P-polarized light and are incident on the second collimating lens 55. Specifically, the laser light emitted from each of the light sources 52IR, 52R, 52G, and 52B is configured to be P-polarized light.

The dichroic mirror 53 is a wavelength selection element configured to transmit the narrowband light emitted from the narrowband light source unit 52 and reflect the white light emitted from the broadband light source 51.

Specifically, the white light emitted from the broadband light source 51 is incident on the dichroic mirror 53, so that the same wavelength band component as that of the narrow band light emitted from the narrow band light source unit 52 is transmitted, and the other wavelength bands are transmitted. The component will be reflected.

The dichroic mirror 53 combines the incident red laser light, blue laser light, and green laser light from the narrow-band light source unit 52 and the light reflected by the dichroic mirror 53 among the white light from the broadband light source 51. The generated combined white light is configured to be a desired white light.

The dichroic mirror 53 is configured by forming a dielectric multilayer film on a glass material.
FIG. 3 is a diagram showing the transmittance / reflectance characteristics of a general dichroic mirror, in which the horizontal axis represents wavelength and the vertical axis represents transmittance or reflectance. A broken line with a narrow line spacing indicates a transmission spectrum of P-polarized light, a dashed-dotted line indicates a transmission spectrum of S-polarized light, a solid line indicates a non-polarized transmission spectrum, and a broken line with a wide line spacing indicates a non-polarized reflection spectrum.

FIG. 4 shows a case where the polarization direction of the laser light from the narrow-band light source unit 52 incident on the dichroic mirror 53 is not considered and when the polarization direction is all considered as the P-polarization in the design, the dichroic mirror 53 in each blue light band. The transmittance at is shown.

The non-consideration of the polarization direction in FIG. 4 is an example in which the polarization directions of the laser beams from all the narrow-band light sources do not coincide with each other. Here, the P-polarized light from the IR light source 52IR, the S-polarized light from the R light source 52R, G A case where P-polarized laser light is emitted from the light source 52G and P-polarized laser light is emitted from the B light source 52B is shown. In this example, the transmittance of light incident on the dichroic mirror 53 in the blue light band was 98.87%.

On the other hand, when all the light emitted from all the light sources 52IR, 52R, 52G, and 52B becomes P-polarized light and enters the dichroic mirror 53, the transmittance in the blue light band is 99.67%.

In this way, in consideration of the polarization direction of the narrowband light, the polarization directions of the plurality of laser beams from the narrowband light source unit 52 incident on the dichroic mirror 53 are all aligned with the P-polarized light. Light utilization efficiency can be improved. As a result, the site to be observed can be imaged under irradiation light with an increased amount of light, a bright image as a whole can be obtained, and more accurate endoscopic diagnosis can be performed.

The first collimator lens 54, the second collimator lens 55, and the condenser lens 56 all have a refractive index Nd of greater than 1.70 and less than 1.85, and an Abbe number νd of greater than 40 and 55. By using a smaller glass material, it is possible to realize high NA (Numerical Aperture) and improved transmittance in a short wavelength region. The refractive index Nd and the Abbe number νd are the refractive index and Abbe number defined by the d line 587.56 nm.

When the light source device 5 of the present embodiment is applied to an endoscope system or a microscope, the radiation angle of illumination light is wide, and thus it is necessary to collect light with a high NA in the condenser lens 56. In order to realize a high NA, it is conceivable to use a high refractive index glass. Generally, a high refractive index glass has a low transmittance in a short wavelength band, for example, an ultraviolet region.

Therefore, by using a glass material whose refractive index and Abbe number are within the above ranges, it is possible to achieve both a high NA and improved transmittance in the short wavelength region in a balanced manner, and illumination suitable for endoscope systems and microscopes. Light can be obtained. In particular, when the light source device has an ultraviolet light source as a narrow-band light source, the utilization efficiency of light from the ultraviolet laser light can be improved.

Further, the same glass material whose refractive index and Abbe number satisfy the above ranges can be applied to the first collimating lens 54, the second collimating lens 55, and the condensing lens 56, and antireflection deposited on each lens. Since the design of the coating film can be made common, the manufacturing efficiency is good and the cost can be reduced.

As in the present embodiment, when the narrowband light incident on the dichroic mirror 53 is P-polarized light, the dichroic mirror 53 transmits the P-polarized light of the narrowband light (laser light), and the white light from the broadband light source 51 is transmitted. It is preferable to arrange each light source so as to reflect, and the light efficiency is improved.

This is because the transmission wavelength band of P-polarized light is wider than the transmission wavelength band of S-polarized light. Therefore, when combining using P-polarized narrow band light, the dichroic mirror 53 is set so that the narrow band light of P-polarized light is transmitted. This is because the light efficiency is improved by the arrangement.

In this embodiment, combined white light can be generated by P-polarized narrow band light and non-polarized broadband light (white light). As a result, since it is possible to multiplex without the need to align the polarization of the broadband light, an optical element such as a PS converter is not necessary, and the apparatus can be miniaturized.

(Second Embodiment)
The endoscope system 101 according to the present embodiment and the light source device 105 used therefor will be described with reference to FIGS. 1 and 5. FIG. 5 is a schematic diagram illustrating a configuration example of the light source device 105. Components similar to those in the first embodiment are denoted by the same reference numerals, and description thereof may be omitted.

In the first embodiment, the laser light from the narrow-band light source unit 52 is emitted while being aligned with the P-polarized light, and the P-polarized laser light from the narrow-band light source unit 52 is transmitted through the dichroic mirror 53 and the broadband light source 51. The white light from the dichroic mirror 53 was reflected.

On the other hand, in the present embodiment, the laser light from the narrow-band light source unit 52 is emitted while being aligned with S-polarized light, and the S-polarized laser light from the narrow-band light source unit 52 is reflected by a dichroic mirror 153 described later. The white light from the broadband light source 51 is configured to pass through the dichroic mirror 153.
Hereinafter, a description will be given focusing on the configuration different from the first embodiment.

As shown in FIG. 1, the endoscope system 101 includes an endoscope 2, a camera 4, a medical light source device 105 (hereinafter referred to as a light source device 105), and a light guide cable 6. As shown in FIG. 5, the light source device 105 includes a broadband light source 51, a narrow-band light source unit 52, a dichroic mirror 153 as an optical element, a first collimating lens 54, a second collimating lens 55, And an optical lens 56.

The dichroic mirror 153 is a wavelength selection element configured to reflect the narrow-band laser light emitted from the narrow-band light source unit 52 and transmit the white light emitted from the broadband light source 51.

Specifically, the white light emitted from the broadband light source 51 is incident on the dichroic mirror 153, so that the same wavelength band component as the wavelength band emitted from the narrow band light source unit 52 is reflected, and the other wavelength band components. Will be transparent.

The dichroic mirror 153 combines the incident red laser light, blue laser light, and green laser light from the narrow-band light source unit 52 and the light reflected by the dichroic mirror 153 among the white light from the broadband light source 51. The generated combined white light is configured to be a desired white light.

The dichroic mirror 153 is configured by forming a dielectric multilayer film on a glass material.
FIG. 6 is a diagram showing the transmittance / reflectance characteristics of a general dichroic mirror, in which the horizontal axis represents wavelength and the vertical axis represents transmittance or reflectance. A broken line with a narrow line interval indicates a reflection spectrum of P-polarized light, a dashed-dotted line indicates a reflection / transmission spectrum of S-polarized light, a solid line indicates a non-polarization reflection spectrum, and a broken line with a large line interval indicates an unpolarized transmission spectrum.

Also in the present embodiment, similarly to the first embodiment, the dichroic mirror 153 is incident with laser light whose polarization direction is aligned so that the polarization direction of the laser light from the narrow-band light source unit 52 is all S-polarized light. As a result, the light utilization efficiency of narrowband light can be improved as compared with the case where the polarization direction is not taken into consideration.

As in the present embodiment, when the light incident on the dichroic mirror 153 is S-polarized light, the dichroic mirror 153 reflects the S-polarized light of the narrow band light (laser light) and transmits the white light from the broadband light source 51. Thus, it is preferable to arrange each light source so that the light efficiency is improved.

This is because the reflection wavelength band of S-polarized light is wider than the reflection wavelength band of P-polarized light, and therefore when combining using S-polarized narrow band light, the dichroic mirror 153 is reflected so that the S-polarized narrow band light is reflected. This is because the light efficiency is improved by disposing.

In this embodiment, combined white light can be generated by S-polarized narrow-band light and non-polarized broadband light (white light). As a result, since it is possible to multiplex without the need to align the polarization of the broadband light, an optical element such as a PS converter is not necessary, and the apparatus can be miniaturized.

The dichroic mirror 153 that reflects the predetermined narrow band light is difficult to produce and is likely to be expensive in cost as compared with the dichroic mirror 53 that transmits the predetermined narrow band light. The configuration shown in the form is desirable.

(Other embodiments)
In the above-described embodiment, the wavelength selection element is used as the optical element including the dielectric multilayer film, but a polarization selection element may be used.

For example, instead of the dichroic mirror 53 of the first embodiment, a polarization beam splitter (PBS; Polarizing Beam Splitter) as a polarization selection element can be used. This polarization beam splitter transmits P-polarized light and reflects S-polarized light.

In this configuration, the P-polarized narrow-band light from the narrow-band light source unit 52 is transmitted through the polarization beam splitter and is incident on the condenser lens 56. On the other hand, white light from the broadband light source 51 is separated into S-polarized light and P-polarized light by the polarization beam splitter, and the S-polarized component of the white light is incident on the condenser lens 56.

Further, instead of the dichroic mirror 153 of the second embodiment, a polarization beam splitter as a polarization selection element can be used. This polarizing beam splitter transmits S-polarized light and reflects P-polarized light.

In this configuration, the S-polarized narrow-band light from the narrow-band light source unit 52 is reflected by the polarization beam splitter and is incident on the condenser lens 56. On the other hand, white light from the broadband light source 51 is separated into S-polarized light and P-polarized light by the polarization beam splitter, and the P-polarized component of the white light is incident on the condenser lens 56.

Thus, when a polarization selection element is used as an optical element, combined white light is generated by narrow band light of P polarization (S polarization) and broadband light (white light) of S polarization (P polarization). That is, narrowband light and broadband light whose polarization directions are orthogonal to each other are multiplexed. For this reason, since broadband light can always use only one polarization component, the efficiency is greatly reduced. However, if the polarization of broadband light is made uniform with a PS converter or the like, the efficiency can be greatly recovered.

Embodiments of the present technology are not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present technology.
For example, in the endoscope systems 1 and 101 described above, the monitor observation by the camera 4 is possible. However, the medical light source device may be applied to a surgical microscope, and illumination light suitable for visual observation. Can be obtained.

In the above-described embodiment, the plurality of narrow-band light sources are configured to have the same polarization direction. However, the present invention is not limited to this. For example, an optical element for converting P-polarized light (S-polarized light) into S-polarized light (P-polarized light) is provided between a narrow-band light source and a dichroic mirror corresponding to the light source, and finally enters the second collimating lens 55. The narrow band light may be configured to have the same polarization direction.

Next, specific examples of the optical system when the light from the narrow-band light source and the light from the broadband light source are combined and incident on the light guide cable will be described below using the third and fourth embodiments. In the description of the following embodiments, the same reference numerals are given to the same configurations as those of the above-described embodiments, and the description may be omitted.
In the third and fourth embodiments, specific lens data is given, but these are examples and are not limited to these.

(Third embodiment)
FIG. 7 is a configuration example of the medical light source device 205 according to the present embodiment, from when the light from the narrow-band light source unit 52 and the light from the broadband light source 51 are combined and enter the light guide cable 6. It is a figure explaining an optical system. In FIG. 7, the illustration of light rays is omitted to make the drawing easier to see.
FIG. 8 is a partial view of the configuration shown in FIG. 7, and is a schematic diagram for explaining an optical system until light from the narrow-band light source unit 52 reaches the light guide cable 6. This optical system is referred to as a first illumination optical system.
FIG. 9 is a partial view of the configuration shown in FIG. 7, and is a schematic diagram for explaining an optical system until light from the broadband light source 51 reaches the light guide cable 6. This optical system is referred to as a second illumination optical system.

First, a schematic configuration of the medical light source device 205 of the present embodiment will be described.
As shown in FIG. 7, the medical light source device 205 of the present embodiment includes a broadband light source 51, a narrow-band light source unit 52, a dichroic mirror 53 as an optical element, a first lens group 254, A collimator lens G1, a third lens group 256, a diffusion plate 251, a diaphragm S1, and a diaphragm S2 are provided. The second collimating lens G1 constitutes a second lens group.

The diffuser plate 251 is arranged at the rear stage of the emission part of the narrow band light source part 52. Laser light from the narrow-band light source unit 52 is applied to the diffusion plate 251. The diffusion plate 251 diffuses the laser light from the narrow-band light source unit 52 at a diffusion angle corresponding to NA 0.164. The emission size is φ11.0. The diffused light is incident on the second collimating lens G1.

The light from the broadband light source 51 and the light from the narrow band light source unit 52 are incident on the dichroic mirror 53.

The first lens group 254 is located between the broadband light source 51 and the dichroic mirror 53 on the optical path. The first lens group 254 collimates the white light from the broadband light source 51 into substantially parallel light, and enters the dichroic mirror 53 serving as a multiplexing unit.

The second collimating lens G1 is located between the narrow-band light source unit 52 and the dichroic mirror 53 on the optical path. The second collimating lens G1 collimates the laser light from the narrow-band light source unit 52 into substantially parallel light, and enters the dichroic mirror 53 serving as a multiplexing unit.

The third lens group 256 is located between the dichroic mirror 53 and the light guide cable 6 on the optical path. The third lens group 256 makes the combined light combined by the dichroic mirror 53 enter the incident end face 61 of the light guide cable 6. In the drawing, an image plane (image plane) on the incident end face 61 of the light guide cable 6 for the combined light is denoted by I.

The first lens group 254 includes a lens G4, a lens G5, and a lens G6 in order from the object side (broadband light source 51 side). Lens data for each lens will be described later.
The third lens group 256 includes a lens G2 and a lens G3 in order from the object side (narrowband light source 52 side).

In the present embodiment, all of the lenses G1 to G6 have the same refractive index Nd and the same Abbe number vd, the refractive index Nd is larger than 1.70 and smaller than 1.85, and the Abbe number νd is 40. It is made of a glass material that is larger and smaller than 55.

Next, the first illumination optical system will be described.
As shown in FIG. 8, the second collimating lens G 1, the lens G 2, and the lens G 3 are positioned on the optical path until the light from the narrow band light source unit 52 reaches the incident end surface 61 of the light guide cable 6.

In the first illumination optical system shown in FIG. 8, the object-side numerical aperture is 0.164, the object height is 5.500 mm, the image-side numerical aperture is 0.495, and the image height is 1.903 mm.
Table 1 shows lens data of lenses located on the optical path until the light from the narrow-band light source unit 52 shown in FIG. 8 reaches the incident end face 61 of the light guide cable 6.

In the surface data in Table 1 and Tables 2 to 4 to be described later, the object surface is the object surface, the surface number is the lens surface number counted from the object side, r is the radius of curvature (mm) of the lens, and d is the lens surface distance ( mm), nd is the refractive index for the d-line (wavelength λ = 587.6 nm), vd is the Abbe number for the d-line (wavelength λ = 587.6 nm), the effective radius is the effective radius (mm) of the lens, and (aperture) is The aperture stop S1 (the aperture stop S2 in Tables 2 and 4) and the image plane represent the image plane I, respectively.

In Table 1,

surface numbers

1 and 2 are surface numbers of the second collimating lens G1,

surface numbers

4 and 5 are surface numbers of the lens G2, and

surface numbers

6 and 7 are surface numbers of the lens G3.

Next, the second illumination optical system will be described.
As shown in FIG. 9, a lens G4, a lens G5, a lens G6, an aperture S2, a lens G2, and a lens G3 are on the optical path until the light from the broadband light source 51 reaches the incident end face 61 of the light guide cable 6. To position. In FIG. 9, the diaphragm S2 is not shown.

In the second illumination optical system shown in FIG. 9, the object-side numerical aperture is 0.731, the object height is 1.500 mm, the image-side numerical aperture is 0.553, and the image height is 2.045 mm.
Table 2 shows lens data of lenses located on the optical path until the light from the broadband light source 51 shown in FIG. 9 reaches the incident end face 61 of the light guide cable 6.

In Table 2,

surface numbers

1 and 2 are surface numbers of the lens G4,

surface numbers

3 and 4 are surface numbers of the lens G5,

surface numbers

5 and 6 are surface numbers of the lens G6, surface numbers 8 and 9 is the surface number of the lens G2, and surface numbers 10 and 11 are the surface numbers of the lens G3.

In FIGS. 7 and 9 and FIGS. 10 and 12 described later, the dichroic mirror 53 is illustrated as a simple reflecting surface. Surface number 7 in lens data in Table 2 and Table 4 described later corresponds to a dichroic mirror surface. In Tables 2 and 4, since the seventh and subsequent surfaces are optical systems after reflection, a minus sign is included in the radius of curvature and the surface interval.

As shown in Tables 1 and 2, all of the lenses G1 to G6 have the same refractive index Nd and the same Abbe number vd, and the refractive index Nd is larger than 1.70 and smaller than 1.85. The Abbe number νd is larger than 40 and smaller than 55, which is 54.6735.

Next, the combination of the laser light from the narrow band light source unit 52 of the medical light source device 205 of the present embodiment and the white LED light from the broadband light source 51 will be described.

First, the first illumination optical system will be described.
In the ray diagram shown in FIG. 8, nine light emitting points on the diffusion plate 251 are set. Specifically, a total of 9 points on the light emitting surface of the diffuser plate 251 in the 0% direction (center), ± 40% direction, ± 70% direction, ± 90% direction, and ± 100% direction are set as the emission points. Yes. The ± 100% direction is set to 5.5 mm.
In addition, in the light from each light emitting point, three rays of an upper ray, a principal ray, and a lower ray are illustrated.

The light diffused by the diffusing plate 251 is converted into substantially parallel light by the second collimating lens G1, and then enters a dichroic mirror (reference numeral 53 in FIG. 7) disposed with an inclination of 45 degrees with respect to the optical axis. In FIG. 8, the dichroic mirror 53 is arranged at the position of surface number 3 in Table 1.

The dichroic mirror 53 has a characteristic of transmitting laser light bands such as red light, green light, blue light, violet light, and infrared light from the narrow-band light source 52 and reflecting other bands. Hereinafter, a dichroic mirror having such characteristics may be referred to as a bandpass dichroic mirror.

In general, when the incident angle of light on the dichroic mirror increases and deviates from the design median value, the phenomenon that the spectral characteristics shift to the short wavelength side occurs, and the desired spectral characteristics cannot be exhibited.
However, in the present embodiment, as described above, the diffused light diffused by the diffuser plate 251 is converted into substantially parallel light by the second collimating lens G1, so that the incident angle of the light beam to the bandpass dichroic mirror is set. , Upper light, lower light, and principal light.
Thereby, the angle-dependent characteristics can be sufficiently suppressed.

The laser beam that has passed through the bandpass dichroic mirror is imaged by the lens G2 and the lens G3 with an image side NA (image side numerical aperture) of 0.495 and a spot radius (image height) of 1.903 mm. An incident end face 61 of the light guide cable 6 for guiding illumination light (combined light) is disposed on the imaging plane (image plane I in FIG. 7). The end of the light guide cable 6 opposite to the incident end face 61 is connected to various medical observation devices such as an endoscope and a surgical microscope.

The image side NA (numerical aperture) is set to a value that is substantially the same as or smaller than the numerical aperture of the light guide cable 6 used. Thereby, the optical transmission loss inside the light guide cable 6 can be suppressed.

In this embodiment, the lenses G2 and G3 are both convex lenses and have a convex meniscus shape. Although it is conceivable to use one convex lens as the third lens group 256 and guide the light to the light guide cable 6, by using two lenses such as lenses G2 and G3 as in the present embodiment, a spherical surface is obtained. Occurrence of aberration and coma can be suppressed. Thereby, illumination quality can be improved.

When absorption aberration and coma occur, these aberration components appear as NA errors. For example, since the spherical aberration generated in the convex lens is a high aperture component having an NA of 0.495 or more, it is lost without being guided to the light guide cable 6, or even if the light is guided, the luminance of the illumination light It appears as unevenness, and the illumination quality deteriorates.

Further, in this embodiment, only the convex lens is used, and a Petzval sum minus field curvature is generated. However, the longitudinal chromatic aberration, the lateral chromatic aberration, and the curvature aberration including the field curvature are not problematic. This is because in order to guide the light to the light guide cable 6, it is sufficient that the specification of the image side NA is satisfied, and the above-described aberration that appears in the form of the shift of the image formation point is unlikely to be a problem.

Next, the second illumination optical system will be described.
The broadband light source 51 is composed of a white LED having a light emission size of φ3.0 mm, for example. The light generated from the broadband light source 51 is converted into substantially parallel light by the lens G3, the lens G4, and the lens G5, and then enters the dichroic mirror 53 disposed at an inclination of 45 degrees with respect to the optical axis.

The laser light in the first illumination optical system and the white LED light in the second illumination optical system are combined by the band bus dichroic mirror 53, so that the color rendering index is higher than that of mere white LED light. Illumination light can be obtained.
Thus, the medical light source device according to the present embodiment is suitable as a medical light source device used in a medical observation device that requires high color reproducibility.

The optical path of the white LED light reflected by the dichroic mirror 53 is the same as the optical path of the light passing through the lens G2 and the lens G3 described in the first illumination optical system. That is, white LED light is imaged by the lens G2 and the lens G3 so that the image side NA (image side numerical aperture) is 0.553 and the spot radius (image height) is 2.045 mm.

White LED light is characterized by a Lambert distribution and a wide radiation angle. For this reason, in this embodiment, in order to ensure output power as illumination, the object-side numerical aperture is set to a relatively large value of 0.731.

Also, as the numerical aperture increases, spherical aberration and coma are more likely to occur. However, in this embodiment, the power of the convex lens is divided into three parts using the three lenses G3, G4, and G5, so that spherical aberration and coma are obtained. A high numerical aperture is achieved while suppressing the occurrence of.

In the case of the medical light source device 205, it is important that the image-side numerical apertures in the first illumination optical system and the second illumination optical system are substantially the same. If there is a difference in the image-side numerical aperture between the two optical systems, it appears as a difference in the radiation angle of the illumination light, resulting in uneven color and brightness, resulting in a reduction in illumination quality. Are preferably substantially the same.
Here, “substantially the same” means that one image-side numerical aperture is in a range of ± 3% of the other image-side numerical aperture.

Here, it is conceivable to use a high refractive index glass in order to achieve both high numerical aperture and aberration correction. In general, high refractive index glass has low transmittance in the short wavelength region. Therefore, if the refractive index is excessively increased, the transmittance of short wavelength light such as violet laser light is reduced although it is advantageous in correcting aberrations. The brightness will be reduced. This is not preferable in an illumination system light source device that requires high output.

On the other hand, in the present embodiment, as the lenses G1 to G6, a glass material having a refractive index Nd larger than 1.70 and smaller than 1.85 and an Abbe number νd larger than 40 and smaller than 55 is used. The transmittance in the short wavelength region can be improved.

For example, when the refractive index Nd is 1.85 or more or the Abbe number νd is 40 or less, the transmittance of short wavelength light such as violet laser light is reduced, and the luminance of short wavelength light is reduced.
Further, when the refractive index Nd is 1.70 or less and the Abbe number νd is 55 or more, a decrease in transmittance of short-wavelength light is suppressed, but it becomes difficult to correct spherical aberration and coma aberration. .

In the present embodiment, since all the lenses G1 to G6 are designed so that the refractive index Nd and the Abbe number νd are the same, the design of the antireflection coating film deposited on the lenses is common. The cost can be reduced.

(Fourth embodiment)
FIG. 10 is a configuration example of the medical light source device 305 according to the present embodiment, from when the light from the narrow-band light source unit 52 and the light from the broadband light source 51 are combined and enter the light guide cable 6. It is a figure explaining an optical system. In FIG. 10, illustration of light rays is omitted to make the drawing easier to see.
FIG. 11 is a partial view of the configuration shown in FIG. 10, and is a schematic diagram for explaining an optical system until light from the narrow band light source unit 52 reaches the light guide cable 6. This optical system is referred to as a first illumination optical system.
FIG. 12 is a partial view of the configuration shown in FIG. 10, and is a schematic diagram for explaining an optical system until light from the broadband light source 51 reaches the light guide cable 6. This optical system is referred to as a second illumination optical system.
The same reference numerals are given to the same configurations as those in the above-described embodiment, and the description will be omitted.

First, a schematic configuration of the medical light source device 305 of the present embodiment will be described.
As shown in FIG. 10, the medical light source device 305 of this embodiment includes a broadband light source 51, a narrow-band light source unit 52, a dichroic mirror 53 as an optical element, a first lens group 354, a second lens group 354, and a second lens group 354. A collimator lens G31, a third lens group 356, a diffusion plate 251, a diaphragm S1, and a diaphragm S2 are provided. The second collimating lens G31 constitutes a second lens group.

The diffusing plate 251 is arranged at the rear stage of the emission part of the narrow band light source part 52. Laser light from the narrow-band light source unit 52 is applied to the diffusion plate 251. The diffusion plate 251 diffuses the laser light from the narrow band light source unit 52. The diffused light is incident on the second collimating lens G1.
The light from the broadband light source 51 and the light from the narrow band light source unit 52 are incident on the dichroic mirror 53.

The first lens group 354 is located between the broadband light source 51 and the dichroic mirror 53 on the optical path. The first lens group 354 collimates the white light from the broadband light source 51 into substantially parallel light and makes it incident on the dichroic mirror 53 serving as a multiplexing unit.

The second collimating lens G31 is located between the narrow-band light source unit 52 and the dichroic mirror 53 on the optical path. The second collimating lens G1 collimates the laser light from the narrow-band light source unit 52 into substantially parallel light, and enters the dichroic mirror 53 serving as a multiplexing unit.

The third lens group 356 is located between the dichroic mirror 53 and the light guide cable 6 on the optical path. The third lens group 356 causes the combined light combined by the dichroic mirror 53 to enter the incident end surface 61 of the light guide cable 6. In the drawing, an image plane (image plane) on the incident end face 61 of the light guide cable 6 for the combined light is denoted by I.

The first lens group 354 includes a lens G34, a lens G35, and a lens G36 in order from the object side (broadband light source 51 side). Lens data for each lens will be described later.
The third lens group 356 includes a lens G32 and a lens G33 in order from the object side (narrowband light source 52 side).

In this embodiment, all of the lenses G31 to G36 have the same refractive index Nd and the same Abbe number vd, the refractive index Nd is larger than 1.70 and smaller than 1.85, and the Abbe number νd is 40. It is made of a glass material that is larger and smaller than 55.

Next, the first illumination optical system will be described.
As shown in FIG. 11, the second collimating lens G31, the lens G32, and the lens G33 are positioned on the optical path until the light from the narrow-band light source unit 52 reaches the incident end face 61 of the light guide cable 6.

In the first illumination optical system shown in FIG. 11, the object-side numerical aperture is 0.164, the object height is 5.500 mm, the image-side numerical aperture is 0.496, and the image height is 1.8353 mm.
Table 3 shows lens data of lenses located on the optical path until the light from the narrow-band light source unit 52 shown in FIG. 11 reaches the incident end face 61 of the light guide cable 6.

In Table 3,

surface numbers

1 and 2 are surface numbers of the second collimating lens G31, surface numbers 34 and 35 are surface numbers of the lens G32, and

surface numbers

6 and 7 are surface numbers of the lens G33.

Next, the second illumination optical system will be described.
As shown in FIG. 12, a lens G34, a lens G35, a lens G36, an aperture S2, a lens G32, and a lens G33 are arranged on the optical path until the light from the broadband light source 51 reaches the incident end face 61 of the light guide cable 6. To position. In FIG. 12, illustration of the diaphragm S2 is omitted.

In the second illumination optical system shown in FIG. 12, the object-side numerical aperture is 0.731, the object height is 1.500 mm, the image-side numerical aperture is 0.553, and the image height is 2.045 mm.
Table 4 shows lens data of lenses located on the optical path until the light from the broadband light source 51 shown in FIG. 9 reaches the incident end face 61 of the light guide cable 6.

In Table 4,

surface numbers

1 and 2 are surface numbers of the lens G34,

surface numbers

3 and 4 are surface numbers of the lens G35,

surface numbers

5 and 6 are surface numbers of the lens G36, surface numbers 8 and 9 is the surface number of the lens G32, and surface numbers 10 and 11 are the surface numbers of the lens G33.

As shown in Tables 3 and 4, all of the lenses G31 to G36 have the same refractive index Nd and the same Abbe number vd, and the refractive index Nd is larger than 1.70 and smaller than 1.85. The Abbe number νd is larger than 40 and smaller than 55, which is 54.6735.

In this embodiment, the basic concept of lens design is the same as in the third embodiment. In this embodiment, the cost can be further reduced by adopting a configuration in which a part of the plurality of lenses to be used is made common.

Specifically, the second collimating lens G31, the lens G32, and the lens G36 are shared, and the lens G33 and the lens G34 are also shared. Thereby, an optical system that combines the laser light from the narrow-band light source unit 52 and the white LED light from the broadband light source 51 can be configured using substantially three types of lenses.

In the third embodiment, the numerical aperture (object-side numerical aperture) of the second collimating lens G31 is 0.164, the numerical aperture of the third lens group 256 is 0.496 to 0.500, The numerical aperture of one lens group 254 is 0.731. As described above, the numerical aperture increases in the order of the lens group including the second collimating lens G31, the third lens group 256, and the first lens group 254.
As described in the third embodiment, the higher the numerical aperture, the more the number of lenses increases in the order of this lens group in order to divide the power of the convex lens and reduce the power of the convex lens to form a meniscus shape for aberration correction. ing.

In the fourth embodiment, the third lens group 356 is configured to use the same lens G32 as the second collimating lens G31, and the lens G33 is used to correct the numerical aperture in the third lens group 356. 31 and the lens G33 are designed.
Similarly, the first lens group 354 is configured to use the same lens G36 as the lens G32 of the third lens group 356 and the same lens G34 as the lens G33, and the numerical aperture in the first lens group 354 by the lens G35. The lens G35 is designed so as to correct the above.

By designing the lens in this way, the second collimating lens G31, the lens G32, and the lens G36 can be shared, and the lens G33 and the lens G34 can be shared.

The medical light source device according to the present disclosure can be applied to an endoscope system and a microscope system. The endoscopic surgery system will be described below with reference to FIGS. 13 to 16 and the microscopic surgery system with reference to FIGS. 17 and 18. FIG.

[Endoscopic surgery system]
Hereinafter, an endoscopic surgery system to which the technology according to the present disclosure can be applied will be described with reference to FIGS.
The light source device denoted by reference numeral 5157 in FIG. 15 corresponds to the medical light source device according to the present disclosure. In the endoscopic surgery system, an endoscope is provided that is connected to a medical light source device, guides output light from the medical light source device, and irradiates an observation target site.

FIG. 13 is a diagram schematically showing an overall configuration of an operating room system 5100 to which the technology according to the present disclosure can be applied. Referring to FIG. 13, the operating room system 5100 is configured by connecting a group of apparatuses installed in the operating room so as to cooperate with each other via an audiovisual controller 5107 and an operating room control apparatus 5109.

Various devices can be installed in the operating room. In FIG. 13, as an example, various apparatus groups 5101 for endoscopic surgery, a ceiling camera 5187 provided on the ceiling of the operating room and imaging the operator's hand, and an operating room provided on the operating room ceiling. An operating field camera 5189 that images the entire situation, a plurality of display devices 5103A to 5103D, a recorder 5105, a patient bed 5183, and an illumination 5191 are illustrated.

Here, among these devices, the device group 5101 belongs to an endoscopic surgery system 5113 described later, and includes an endoscope, a display device that displays an image captured by the endoscope, and the like. Each device belonging to the endoscopic surgery system 5113 is also referred to as a medical device. On the other hand, the display devices 5103A to 5103D, the recorder 5105, the patient bed 5183, and the illumination 5191 are devices provided in an operating room, for example, separately from the endoscopic surgery system 5113. These devices that do not belong to the endoscopic surgery system 5113 are also referred to as non-medical devices. The audiovisual controller 5107 and / or the operating room control device 5109 controls the operations of these medical devices and non-medical devices in cooperation with each other.

The audiovisual controller 5107 comprehensively controls processing related to image display in medical devices and non-medical devices. Specifically, among the devices included in the operating room system 5100, the device group 5101, the ceiling camera 5187, and the surgical field camera 5189 have a function of transmitting information to be displayed during surgery (hereinafter also referred to as display information). It may be a device (hereinafter also referred to as a source device). Display devices 5103A to 5103D can be devices that output display information (hereinafter also referred to as output destination devices). The recorder 5105 may be a device that corresponds to both a transmission source device and an output destination device. The audiovisual controller 5107 controls the operation of the transmission source device and the output destination device, acquires display information from the transmission source device, and transmits the display information to the output destination device for display or recording. Have. The display information includes various images captured during the operation, various types of information related to the operation (for example, patient physical information, past examination results, information on a surgical procedure, and the like).

Specifically, the audiovisual controller 5107 can transmit information about the image of the surgical site in the patient's body cavity captured by the endoscope from the device group 5101 as display information. In addition, information about the image at hand of the surgeon captured by the ceiling camera 5187 can be transmitted from the ceiling camera 5187 as display information. Further, information about an image showing the entire operating room imaged by the operating field camera 5189 can be transmitted from the operating field camera 5189 as display information. When there is another device having an imaging function in the operating room system 5100, the audiovisual controller 5107 acquires information about an image captured by the other device from the other device as display information. May be.

Alternatively, for example, information about these images captured in the past is recorded by the audiovisual controller 5107 in the recorder 5105. The audiovisual controller 5107 can acquire information about the image captured in the past from the recorder 5105 as display information. Note that the recorder 5105 may also record various types of information related to surgery in advance.

The audiovisual controller 5107 displays the acquired display information (that is, images taken during the operation and various information related to the operation) on at least one of the display devices 5103A to 5103D that are output destination devices. In the example shown in the figure, the display device 5103A is a display device that is suspended from the ceiling of the operating room, the display device 5103B is a display device that is installed on the wall surface of the operating room, and the display device 5103C is installed in the operating room. The display device 5103D is a mobile device (for example, a tablet PC (Personal Computer)) having a display function.

Although not shown in FIG. 13, the operating room system 5100 may include a device outside the operating room. The device outside the operating room can be, for example, a server connected to a network constructed inside or outside the hospital, a PC used by medical staff, a projector installed in a conference room of the hospital, or the like. When such an external device is outside the hospital, the audio-visual controller 5107 can display the display information on a display device of another hospital via a video conference system or the like for telemedicine.

The operating room control device 5109 comprehensively controls processing other than processing related to image display in non-medical devices. For example, the operating room control device 5109 controls the driving of the patient bed 5183, the ceiling camera 5187, the operating field camera 5189, and the illumination 5191.

The operating room system 5100 is provided with a centralized operation panel 5111, and the user gives an instruction for image display to the audiovisual controller 5107 via the centralized operation panel 5111, or the operating room control apparatus 5109. An instruction about the operation of the non-medical device can be given. The central operation panel 5111 is configured by providing a touch panel on the display surface of the display device.

FIG. 14 is a diagram showing a display example of an operation screen on the centralized operation panel 5111. In FIG. 14, as an example, an operation screen corresponding to a case where the operating room system 5100 is provided with two display devices as output destination devices is illustrated. Referring to FIG. 14, a transmission source selection area 5195, a preview area 5197, and a control area 5201 are provided on the operation screen 5193.

In the transmission source selection area 5195, a transmission source device provided in the operating room system 5100 and a thumbnail screen representing display information of the transmission source device are displayed in association with each other. The user can select display information to be displayed on the display device from any of the transmission source devices displayed in the transmission source selection area 5195.

The preview area 5197 displays a preview of the screen displayed on the two display devices (Monitor 1 and Monitor 2) that are output destination devices. In the illustrated example, four images are displayed as PinP on one display device. The four images correspond to display information transmitted from the transmission source device selected in the transmission source selection area 5195. Of the four images, one is displayed as a relatively large main image, and the remaining three are displayed as a relatively small sub image. The user can switch the main image and the sub image by appropriately selecting an area in which four images are displayed. In addition, a status display area 5199 is provided below the area where the four images are displayed, and the status relating to the surgery (for example, the elapsed time of the surgery, the patient's physical information, etc.) is appropriately displayed in the area. obtain.

In the control area 5201, a GUI (Graphical User Interface) part for displaying a GUI (Graphical User Interface) part for operating the source apparatus and a GUI part for operating the output destination apparatus are displayed. And an output destination operation area 5205 in which is displayed. In the illustrated example, the transmission source operation area 5203 is provided with GUI parts for performing various operations (panning, tilting, and zooming) on the camera in the transmission source device having an imaging function. The user can operate the operation of the camera in the transmission source device by appropriately selecting these GUI components. Although illustration is omitted, when the transmission source device selected in the transmission source selection area 5195 is a recorder (that is, in the preview area 5197, images recorded in the past are displayed on the recorder). In the case of GUI), a GUI component for performing operations such as playback, stop playback, rewind, and fast forward of the image can be provided in the transmission source operation area 5203.

In the output destination operation area 5205, GUI parts for performing various operations (swap, flip, color adjustment, contrast adjustment, switching between 2D display and 3D display) on the display device that is the output destination device are provided. Is provided. The user can operate the display on the display device by appropriately selecting these GUI components.

Note that the operation screen displayed on the centralized operation panel 5111 is not limited to the example shown in the figure, and the user can use the audiovisual controller 5107 and the operating room control device 5109 provided in the operating room system 5100 via the centralized operation panel 5111. Operation input for each device that can be controlled may be possible.

FIG. 15 is a diagram showing an example of a state of surgery to which the operating room system described above is applied. The ceiling camera 5187 and the operating field camera 5189 are provided on the ceiling of the operating room, and can photograph the state of the operator (doctor) 5181 who performs treatment on the affected part of the patient 5185 on the patient bed 5183 and the entire operating room. It is. The ceiling camera 5187 and the surgical field camera 5189 may be provided with a magnification adjustment function, a focal length adjustment function, a photographing direction adjustment function, and the like. The illumination 5191 is provided on the ceiling of the operating room and irradiates at least the hand of the operator 5181. The illumination 5191 may be capable of appropriately adjusting the irradiation light amount, the wavelength (color) of the irradiation light, the light irradiation direction, and the like.

Endoscopic surgery system 5113, patient bed 5183, ceiling camera 5187, operating field camera 5189 and illumination 5191 are connected via audiovisual controller 5107 and operating room controller 5109 (not shown in FIG. 15) as shown in FIG. Are connected to each other. A centralized operation panel 5111 is provided in the operating room. As described above, the user can appropriately operate these devices existing in the operating room via the centralized operating panel 5111.

Hereinafter, the configuration of the endoscopic surgery system 5113 will be described in detail. As shown in the figure, an endoscopic surgery system 5113 includes an endoscope 5115, other surgical tools 5131, a support arm device 5141 that supports the endoscope 5115, and various devices for endoscopic surgery. And a cart 5151 on which is mounted.

In endoscopic surgery, instead of cutting and opening the abdominal wall, a plurality of cylindrical opening devices called trocars 5139a to 5139d are punctured into the abdominal wall. Then, the lens barrel 5117 of the endoscope 5115 and other surgical tools 5131 are inserted into the body cavity of the patient 5185 from the trocars 5139a to 5139d. In the illustrated example, as other surgical tools 5131, an insufflation tube 5133, an energy treatment tool 5135, and forceps 5137 are inserted into the body cavity of the patient 5185. The energy treatment instrument 5135 is a treatment instrument that performs incision and detachment of a tissue, sealing of a blood vessel, and the like by high-frequency current and ultrasonic vibration. However, the illustrated surgical tool 5131 is merely an example, and as the surgical tool 5131, for example, various surgical tools generally used in endoscopic surgery such as a lever and a retractor may be used.

An image of the surgical site in the body cavity of the patient 5185 taken by the endoscope 5115 is displayed on the display device 5155. The surgeon 5181 performs a treatment such as excision of the affected part using the energy treatment tool 5135 and the forceps 5137 while viewing the image of the surgical part displayed on the display device 5155 in real time. Although not shown, the pneumoperitoneum tube 5133, the energy treatment tool 5135, and the forceps 5137 are supported by an operator 5181 or an assistant during surgery.

(Support arm device)
The support arm device 5141 includes an arm portion 5145 extending from the base portion 5143. In the illustrated example, the arm portion 5145 includes

joint portions

5147a, 5147b, and 5147c, and

links

5149a and 5149b, and is driven by control from the arm control device 5159. The endoscope 5115 is supported by the arm unit 5145, and its position and posture are controlled. Thereby, the stable position fixing of the endoscope 5115 can be realized.

(Endoscope)
The endoscope 5115 includes a lens barrel 5117 in which a region having a predetermined length from the distal end is inserted into the body cavity of the patient 5185, and a camera head 5119 connected to the proximal end of the lens barrel 5117. In the illustrated example, an endoscope 5115 configured as a so-called rigid mirror having a rigid lens barrel 5117 is illustrated, but the endoscope 5115 is configured as a so-called flexible mirror having a flexible lens barrel 5117. Also good.

An opening into which an objective lens is fitted is provided at the tip of the lens barrel 5117. A light source device 5157 is connected to the endoscope 5115, and the light generated by the light source device 5157 is guided to the tip of the lens barrel by a light guide extending inside the lens barrel 5117, and the objective Irradiation is performed toward the observation target in the body cavity of the patient 5185 through the lens. Note that the endoscope 5115 may be a direct endoscope, a perspective mirror, or a side endoscope.

An optical system and an image sensor are provided inside the camera head 5119, and reflected light (observation light) from the observation target is condensed on the image sensor by the optical system. Observation light is photoelectrically converted by the imaging element, and an electrical signal corresponding to the observation light, that is, an image signal corresponding to the observation image is generated. The image signal is transmitted to a camera control unit (CCU) 5153 as RAW data. Note that the camera head 5119 has a function of adjusting the magnification and the focal length by appropriately driving the optical system.

Note that a plurality of image sensors may be provided in the camera head 5119 in order to cope with, for example, stereoscopic viewing (3D display). In this case, a plurality of relay optical systems are provided inside the lens barrel 5117 in order to guide observation light to each of the plurality of imaging elements.

(Various devices mounted on the cart)
The CCU 5153 includes a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), and the like, and comprehensively controls the operations of the endoscope 5115 and the display device 5155. Specifically, the CCU 5153 performs various image processing for displaying an image based on the image signal, such as development processing (demosaic processing), for example, on the image signal received from the camera head 5119. The CCU 5153 provides the display device 5155 with the image signal subjected to the image processing. Further, the audiovisual controller 5107 shown in FIG. 13 is connected to the CCU 5153. The CCU 5153 also provides an image signal subjected to image processing to the audiovisual controller 5107. In addition, the CCU 5153 transmits a control signal to the camera head 5119 to control the driving thereof. The control signal can include information regarding imaging conditions such as magnification and focal length. Information regarding the imaging conditions may be input via the input device 5161 or may be input via the above-described centralized operation panel 5111.

The display device 5155 displays an image based on an image signal subjected to image processing by the CCU 5153 under the control of the CCU 5153. For example, the endoscope 5115 is compatible with high-resolution imaging such as 4K (horizontal pixel number 3840 × vertical pixel number 2160) or 8K (horizontal pixel number 7680 × vertical pixel number 4320), and / or 3D display. In the case of the display device 5155, a display device 5155 that can display a high resolution and / or a device that can display 3D can be used. In the case of 4K or 8K high resolution imaging, a more immersive feeling can be obtained by using a display device 5155 having a size of 55 inches or more. Further, a plurality of display devices 5155 having different resolutions and sizes may be provided depending on applications.

The light source device 5157 is composed of a light source such as an LED (light emitting diode), for example, and supplies the endoscope 5115 with irradiation light when photographing a surgical site.

The arm control device 5159 is configured by a processor such as a CPU, for example, and operates according to a predetermined program to control driving of the arm portion 5145 of the support arm device 5141 according to a predetermined control method.

The input device 5161 is an input interface to the endoscopic surgery system 5113. A user can input various information and instructions to the endoscopic surgery system 5113 via the input device 5161. For example, the user inputs various types of information related to the operation, such as the patient's physical information and information about the surgical technique, via the input device 5161. In addition, for example, the user instructs to drive the arm unit 5145 via the input device 5161 or an instruction to change the imaging conditions (type of irradiation light, magnification, focal length, etc.) by the endoscope 5115. An instruction to drive the energy treatment instrument 5135 is input.

The type of the input device 5161 is not limited, and the input device 5161 may be various known input devices. As the input device 5161, for example, a mouse, a keyboard, a touch panel, a switch, a foot switch 5171 and / or a lever can be applied. In the case where a touch panel is used as the input device 5161, the touch panel may be provided on the display surface of the display device 5155.

Alternatively, the input device 5161 is a device worn by the user, such as a glasses-type wearable device or an HMD (Head Mounted Display), for example, and various inputs according to the user's gesture and line of sight detected by these devices. Is done. The input device 5161 includes a camera capable of detecting a user's movement, and various inputs are performed according to a user's gesture and line of sight detected from an image captured by the camera. Furthermore, the input device 5161 includes a microphone that can pick up the voice of the user, and various inputs are performed by voice through the microphone. As described above, the input device 5161 is configured to be able to input various types of information without contact, so that a user belonging to the clean area (for example, an operator 5181) operates a device belonging to the unclean area without contact. Is possible. In addition, since the user can operate the device without releasing his / her hand from the surgical tool he / she has, the convenience for the user is improved.

The treatment instrument control device 5163 controls driving of the energy treatment instrument 5135 for tissue cauterization, incision, blood vessel sealing, or the like. In order to inflate the body cavity of the patient 5185 for the purpose of securing the visual field by the endoscope 5115 and securing the operator's work space, the pneumoperitoneum device 5165 passes gas into the body cavity via the pneumothorax tube 5133 Send in. The recorder 5167 is an apparatus capable of recording various types of information related to surgery. The printer 5169 is a device that can print various types of information related to surgery in various formats such as text, images, or graphs.

Hereinafter, a particularly characteristic configuration in the endoscopic surgery system 5113 will be described in more detail.

(Support arm device)
The support arm device 5141 includes a base portion 5143 which is a base, and an arm portion 5145 extending from the base portion 5143. In the illustrated example, the arm portion 5145 includes a plurality of

joint portions

5147a, 5147b, and 5147c and a plurality of

links

5149a and 5149b connected by the joint portion 5147b. However, in FIG. The structure of the arm part 5145 is shown in a simplified manner. Actually, the shape, number and arrangement of the joint portions 5147a to 5147c and the

links

5149a and 5149b, the direction of the rotation axis of the joint portions 5147a to 5147c, and the like are appropriately set so that the arm portion 5145 has a desired degree of freedom. obtain. For example, the arm portion 5145 can be preferably configured to have six or more degrees of freedom. Accordingly, the endoscope 5115 can be freely moved within the movable range of the arm unit 5145, and therefore the lens barrel 5117 of the endoscope 5115 can be inserted into the body cavity of the patient 5185 from a desired direction. It becomes possible.

The joint portions 5147a to 5147c are provided with actuators, and the joint portions 5147a to 5147c are configured to be rotatable around a predetermined rotation axis by driving the actuators. When the drive of the actuator is controlled by the arm control device 5159, the rotation angles of the joint portions 5147a to 5147c are controlled, and the drive of the arm portion 5145 is controlled. Thereby, control of the position and posture of the endoscope 5115 can be realized. At this time, the arm control device 5159 can control the driving of the arm unit 5145 by various known control methods such as force control or position control.

For example, when the surgeon 5181 appropriately inputs an operation via the input device 5161 (including the foot switch 5171), the arm controller 5159 appropriately controls the driving of the arm unit 5145 according to the operation input. The position and posture of the endoscope 5115 may be controlled. With this control, the endoscope 5115 at the distal end of the arm portion 5145 can be moved from an arbitrary position to an arbitrary position and then fixedly supported at the position after the movement. The arm unit 5145 may be operated by a so-called master slave method. In this case, the arm unit 5145 can be remotely operated by the user via the input device 5161 installed at a location away from the operating room.

When force control is applied, the arm control device 5159 receives the external force from the user and moves the actuators of the joint portions 5147a to 5147c so that the arm portion 5145 moves smoothly according to the external force. You may perform what is called power assist control to drive. Accordingly, when the user moves the arm unit 5145 while directly touching the arm unit 5145, the arm unit 5145 can be moved with a relatively light force. Therefore, the endoscope 5115 can be moved more intuitively and with a simpler operation, and the convenience for the user can be improved.

Here, in general, in an endoscopic operation, an endoscope 5115 is supported by a doctor called a scopist. In contrast, by using the support arm device 5141, the position of the endoscope 5115 can be more reliably fixed without relying on human hands, so that an image of the surgical site can be stably obtained. It becomes possible to perform the operation smoothly.

Note that the arm control device 5159 is not necessarily provided in the cart 5151. Further, the arm control device 5159 does not necessarily have to be one device. For example, the arm control device 5159 may be provided in each of the joint portions 5147a to 5147c of the arm portion 5145 of the support arm device 5141, and the plurality of arm control devices 5159 cooperate to drive the arm portion 5145. Control may be realized.

(Light source device)
The light source device 5157 supplies irradiation light for imaging the surgical site to the endoscope 5115. The light source device 5157 is constituted by a white light source constituted by, for example, an LED, a laser light source, or a combination thereof. At this time, when a white light source is configured by a combination of RGB laser light sources, the output intensity and output timing of each color (each wavelength) can be controlled with high accuracy. Adjustments can be made. In this case, the laser light from each of the RGB laser light sources is irradiated onto the observation target in a time-sharing manner, and the driving of the image sensor of the camera head 5119 is controlled in synchronization with the irradiation timing, thereby corresponding to each RGB. It is also possible to take the images that have been taken in time division. According to this method, a color image can be obtained without providing a color filter in the image sensor.

Further, the driving of the light source device 5157 may be controlled so as to change the intensity of the output light every predetermined time. Synchronously with the timing of changing the intensity of the light, the driving of the image sensor of the camera head 5119 is controlled to acquire an image in a time-sharing manner, and the image is synthesized, so that high dynamic without so-called blackout and overexposure is obtained. A range image can be generated.

Further, the light source device 5157 may be configured to be able to supply light of a predetermined wavelength band corresponding to special light observation. In special light observation, for example, by utilizing the wavelength dependence of light absorption in body tissue, the surface of the mucous membrane is irradiated by irradiating light in a narrow band compared to irradiation light (ie, white light) during normal observation. So-called narrow band imaging is performed in which a predetermined tissue such as a blood vessel is imaged with high contrast. Alternatively, in special light observation, fluorescence observation may be performed in which an image is obtained by fluorescence generated by irradiating excitation light. In fluorescence observation, the body tissue is irradiated with excitation light to observe fluorescence from the body tissue (autofluorescence observation), or a reagent such as indocyanine green (ICG) is locally administered to the body tissue and applied to the body tissue. What obtains a fluorescence image by irradiating excitation light corresponding to the fluorescence wavelength of the reagent can be performed. The light source device 5157 can be configured to be able to supply narrowband light and / or excitation light corresponding to such special light observation.

(Camera head and CCU)
The functions of the camera head 5119 and the CCU 5153 of the endoscope 5115 will be described in more detail with reference to FIG. FIG. 15 is a block diagram illustrating an example of functional configurations of the camera head 5119 and the CCU 5153 illustrated in FIG.

Referring to FIG. 15, the camera head 5119 has a lens unit 5121, an imaging unit 5123, a drive unit 5125, a communication unit 5127, and a camera head control unit 5129 as its functions. Further, the CCU 5153 includes a communication unit 5173, an image processing unit 5175, and a control unit 5177 as its functions. The camera head 5119 and the CCU 5153 are connected to each other via a transmission cable 5179 so that they can communicate with each other.

First, the functional configuration of the camera head 5119 will be described. The lens unit 5121 is an optical system provided at a connection portion with the lens barrel 5117. Observation light taken from the tip of the lens barrel 5117 is guided to the camera head 5119 and enters the lens unit 5121. The lens unit 5121 is configured by combining a plurality of lenses including a zoom lens and a focus lens. The optical characteristics of the lens unit 5121 are adjusted so that the observation light is condensed on the light receiving surface of the image sensor of the imaging unit 5123. Further, the zoom lens and the focus lens are configured such that their positions on the optical axis are movable in order to adjust the magnification and focus of the captured image.

The imaging unit 5123 is configured by an imaging element, and is arranged at the rear stage of the lens unit 5121. The observation light that has passed through the lens unit 5121 is collected on the light receiving surface of the imaging element, and an image signal corresponding to the observation image is generated by photoelectric conversion. The image signal generated by the imaging unit 5123 is provided to the communication unit 5127.

As the image pickup element constituting the image pickup unit 5123, for example, a CMOS (Complementary Metal Oxide Semiconductor) type image sensor that can perform color photographing having a Bayer array is used. In addition, as the imaging element, for example, an element capable of capturing a high-resolution image of 4K or more may be used. By obtaining an image of the surgical site with high resolution, the surgeon 5181 can grasp the state of the surgical site in more detail, and can proceed with the surgery more smoothly.

Also, the image sensor that constitutes the image capturing unit 5123 is configured to have a pair of image sensors for acquiring right-eye and left-eye image signals corresponding to 3D display. By performing the 3D display, the operator 5181 can more accurately grasp the depth of the living tissue in the surgical site. Note that in the case where the imaging unit 5123 is configured as a multi-plate type, a plurality of lens units 5121 are also provided corresponding to each imaging element.

Further, the imaging unit 5123 is not necessarily provided in the camera head 5119. For example, the imaging unit 5123 may be provided inside the lens barrel 5117 immediately after the objective lens.

The driving unit 5125 includes an actuator, and moves the zoom lens and the focus lens of the lens unit 5121 by a predetermined distance along the optical axis under the control of the camera head control unit 5129. Thereby, the magnification and focus of the image captured by the imaging unit 5123 can be adjusted as appropriate.

The communication unit 5127 includes a communication device for transmitting and receiving various types of information to and from the CCU 5153. The communication unit 5127 transmits the image signal obtained from the imaging unit 5123 to the CCU 5153 via the transmission cable 5179 as RAW data. At this time, in order to display a captured image of the surgical site with low latency, the image signal is preferably transmitted by optical communication. At the time of surgery, the surgeon 5181 performs the surgery while observing the state of the affected part with the captured image, so that a moving image of the surgical part is displayed in real time as much as possible for safer and more reliable surgery. Because it is required. When optical communication is performed, the communication unit 5127 is provided with a photoelectric conversion module that converts an electrical signal into an optical signal. The image signal is converted into an optical signal by the photoelectric conversion module, and then transmitted to the CCU 5153 via the transmission cable 5179.

The communication unit 5127 receives a control signal for controlling the driving of the camera head 5119 from the CCU 5153. The control signal includes, for example, information for designating the frame rate of the captured image, information for designating the exposure value at the time of imaging, and / or information for designating the magnification and focus of the captured image. Contains information about the condition. The communication unit 5127 provides the received control signal to the camera head control unit 5129. Note that the control signal from the CCU 5153 may also be transmitted by optical communication. In this case, the communication unit 5127 is provided with a photoelectric conversion module that converts an optical signal into an electrical signal. The control signal is converted into an electrical signal by the photoelectric conversion module and then provided to the camera head control unit 5129.

The imaging conditions such as the frame rate, exposure value, magnification, and focus are automatically set by the control unit 5177 of the CCU 5153 based on the acquired image signal. That is, a so-called AE (Auto Exposure) function, AF (Auto Focus) function, and AWB (Auto White Balance) function are mounted on the endoscope 5115.

The camera head control unit 5129 controls driving of the camera head 5119 based on a control signal from the CCU 5153 received via the communication unit 5127. For example, the camera head control unit 5129 controls driving of the image sensor of the imaging unit 5123 based on information indicating that the frame rate of the captured image is specified and / or information indicating that the exposure at the time of imaging is specified. For example, the camera head control unit 5129 appropriately moves the zoom lens and the focus lens of the lens unit 5121 via the drive unit 5125 based on information indicating that the magnification and focus of the captured image are designated. The camera head control unit 5129 may further have a function of storing information for identifying the lens barrel 5117 and the camera head 5119.

It should be noted that the camera head 5119 can be resistant to autoclave sterilization by arranging the lens unit 5121, the imaging unit 5123, and the like in a sealed structure with high airtightness and waterproofness.

Next, the functional configuration of the CCU 5153 will be described. The communication unit 5173 is configured by a communication device for transmitting and receiving various types of information to and from the camera head 5119. The communication unit 5173 receives an image signal transmitted from the camera head 5119 via the transmission cable 5179. At this time, as described above, the image signal can be suitably transmitted by optical communication. In this case, corresponding to optical communication, the communication unit 5173 is provided with a photoelectric conversion module that converts an optical signal into an electric signal. The communication unit 5173 provides the image processing unit 5175 with the image signal converted into the electrical signal.

Also, the communication unit 5173 transmits a control signal for controlling the driving of the camera head 5119 to the camera head 5119. The control signal may also be transmitted by optical communication.

The image processing unit 5175 performs various types of image processing on the image signal that is RAW data transmitted from the camera head 5119. Examples of the image processing include development processing, high image quality processing (band enhancement processing, super-resolution processing, NR (Noise reduction) processing and / or camera shake correction processing, etc.), and / or enlargement processing (electronic zoom processing). Various known signal processing is included. Further, the image processing unit 5175 performs detection processing on the image signal for performing AE, AF, and AWB.

The image processing unit 5175 is configured by a processor such as a CPU or a GPU, and the above-described image processing and detection processing can be performed by the processor operating according to a predetermined program. Note that when the image processing unit 5175 includes a plurality of GPUs, the image processing unit 5175 appropriately divides information related to the image signal, and performs image processing in parallel with the plurality of GPUs.

The control unit 5177 performs various controls relating to imaging of the surgical site by the endoscope 5115 and display of the captured image. For example, the control unit 5177 generates a control signal for controlling driving of the camera head 5119. At this time, when the imaging condition is input by the user, the control unit 5177 generates a control signal based on the input by the user. Alternatively, when the endoscope 5115 is equipped with the AE function, the AF function, and the AWB function, the control unit 5177 determines the optimum exposure value, focal length, and the distance according to the detection processing result by the image processing unit 5175. A white balance is appropriately calculated and a control signal is generated.

Also, the control unit 5177 causes the display device 5155 to display an image of the surgical site based on the image signal subjected to image processing by the image processing unit 5175. At this time, the control unit 5177 recognizes various objects in the surgical unit image using various image recognition techniques. For example, the control unit 5177 detects the shape and color of the edge of the object included in the surgical part image, thereby removing surgical tools such as forceps, specific biological parts, bleeding, mist when using the energy treatment tool 5135, and the like. Can be recognized. When displaying an image of the surgical site on the display device 5155, the control unit 5177 causes various types of surgery support information to be superimposed and displayed on the image of the surgical site using the recognition result. Surgery support information is displayed in a superimposed manner and presented to the operator 5181, so that the surgery can be performed more safely and reliably.

The transmission cable 5179 connecting the camera head 5119 and the CCU 5153 is an electric signal cable corresponding to electric signal communication, an optical fiber corresponding to optical communication, or a composite cable thereof.

Here, in the illustrated example, communication is performed by wire using the transmission cable 5179, but communication between the camera head 5119 and the CCU 5153 may be performed wirelessly. When communication between the two is performed wirelessly, there is no need to install the transmission cable 5179 in the operating room, so that the situation where the movement of the medical staff in the operating room is hindered by the transmission cable 5179 can be solved.

Heretofore, an example of the operating room system 5100 to which the technology according to the present disclosure can be applied has been described. Note that although the case where the medical system to which the operating room system 5100 is applied is the endoscopic operating system 5113 is described here as an example, the configuration of the operating room system 5100 is not limited to such an example. For example, the operating room system 5100 may be applied to an examination flexible endoscope system or a microscope operation system instead of the endoscope operation system 5113.

In this way, by using the medical light source device capable of increasing the amount of output light of the present technology, it is possible to image the observation target site under the irradiation light with the increased amount of light, and a bright image as a whole. It is possible to obtain a more accurate endoscopic diagnosis.

[Microscopic surgery system]
Hereinafter, a microscopic surgery system to which the technology according to the present disclosure can be applied will be described with reference to FIGS. 17 and 18.

The light source device denoted by reference numeral 5350 in FIG. 18 corresponds to the medical light source device according to the present disclosure. As shown in FIG. 18, the light source device 5350 is installed on the side surface of a fifth link 5313e described later of the microscope device 5301. In FIG. 17, the light source device is not shown.

The output light from the light source device 5350 passes through a light guide cable constituted by an optical fiber or the like provided in an arm portion 5309 described later, and covers glass from a lower end opening surface of a cylindrical portion 5305 of the microscope portion 5303 described later. It irradiates with respect to an observation object via.
The microscope system includes a microscope unit 5303 as a microscope, a light source device 5350 connected to the microscope unit 5303, and a light guide cable. The microscope unit 5303 guides the output light from the light source device 5350 and irradiates the site to be observed.

FIG. 17 is a diagram illustrating an example of a schematic configuration of a microscopic surgery system 5300 to which the technology according to the present disclosure can be applied. Referring to FIG. 17, the microscope surgery system 5300 includes a microscope device 5301, a control device 5317, and a display device 5319. In the following description of the microscope surgery system 5300, “user” means any medical staff who uses the microscope surgery system 5300, such as an operator and an assistant.

The microscope apparatus 5301 includes a microscope unit 5303 for magnifying and observing an observation target (a patient's surgical site), an arm unit 5309 that supports the microscope unit 5303 at the distal end, and a base unit 5315 that supports the proximal end of the arm unit 5309. Have.

The microscope unit 5303 includes a substantially cylindrical cylindrical part 5305, an imaging unit (not shown) provided inside the cylindrical part 5305, and an operation unit 5307 provided in a partial area on the outer periphery of the cylindrical part 5305. And. The microscope unit 5303 is an electronic imaging type microscope unit (so-called video type microscope unit) in which a captured image is electronically captured by the imaging unit.

A cover glass that protects the internal imaging unit is provided on the opening surface at the lower end of the cylindrical part 5305. Light from the observation target (hereinafter also referred to as observation light) passes through the cover glass and enters the imaging unit inside the cylindrical part 5305. A light source such as an LED (Light Emitting Diode) may be provided inside the cylindrical portion 5305, and light is emitted from the light source to the observation target through the cover glass during imaging. May be.

The imaging unit includes an optical system that collects the observation light and an image sensor that receives the observation light collected by the optical system. The optical system is configured by combining a plurality of lenses including a zoom lens and a focus lens, and the optical characteristics thereof are adjusted so that the observation light is imaged on the light receiving surface of the image sensor. The imaging element receives the observation light and photoelectrically converts it to generate a signal corresponding to the observation light, that is, an image signal corresponding to the observation image. As the imaging element, for example, an element having a Bayer array capable of color photography is used. The image sensor may be various known image sensors such as a CMOS (Complementary Metal Oxide Semiconductor) image sensor or a CCD (Charge Coupled Device) image sensor. The image signal generated by the image sensor is transmitted to the control device 5317 as RAW data. Here, the transmission of the image signal may be preferably performed by optical communication. At the surgical site, the surgeon performs the operation while observing the state of the affected area with the captured image. For safer and more reliable surgery, the moving image of the surgical site should be displayed in real time as much as possible. Because it is. By transmitting an image signal by optical communication, a captured image can be displayed with low latency.

The imaging unit may have a drive mechanism that moves the zoom lens and focus lens of the optical system along the optical axis. By appropriately moving the zoom lens and the focus lens by the drive mechanism, the enlargement magnification of the captured image and the focal length at the time of imaging can be adjusted. The imaging unit may be equipped with various functions that can be generally provided in an electronic imaging microscope unit, such as an AE (Auto Exposure) function and an AF (Auto Focus) function.

In addition, the imaging unit may be configured as a so-called single-plate imaging unit having one imaging element, or may be configured as a so-called multi-plate imaging unit having a plurality of imaging elements. When the imaging unit is configured as a multi-plate type, for example, image signals corresponding to RGB may be generated by each imaging element, and a color image may be obtained by combining them. Or the said imaging part may be comprised so that it may have a pair of image sensor for each acquiring the image signal for right eyes and left eyes corresponding to a stereoscopic vision (3D display). By performing the 3D display, the surgeon can more accurately grasp the depth of the living tissue in the surgical site. When the imaging unit is configured as a multi-plate type, a plurality of optical systems can be provided corresponding to each imaging element.

The operation unit 5307 is configured by, for example, a cross lever or a switch, and is an input unit that receives a user operation input. For example, the user can input an instruction to change the magnification of the observation image and the focal length to the observation target via the operation unit 5307. The magnification ratio and the focal length can be adjusted by appropriately moving the zoom lens and the focus lens by the drive mechanism of the imaging unit in accordance with the instruction. Further, for example, the user can input an instruction to switch the operation mode (all-free mode and fixed mode described later) of the arm unit 5309 via the operation unit 5307. Note that when the user attempts to move the microscope unit 5303, it is assumed that the user moves the microscope unit 5303 while holding the cylindrical unit 5305. Therefore, the operation unit 5307 may be provided at a position where the user can easily operate with a finger while holding the tubular portion 5305 so that the operation portion 5307 can be operated while the tubular portion 5305 is moved. preferable.

The arm portion 5309 is configured by a plurality of links (first link 5313a to sixth link 5313f) being connected to each other by a plurality of joint portions (first joint portion 5311a to sixth joint portion 5311f). Is done.

The first joint portion 5311a has a substantially cylindrical shape, and at its tip (lower end), the upper end of the cylindrical portion 5305 of the microscope portion 5303 is a rotation axis (first axis) parallel to the central axis of the cylindrical portion 5305. O ₁ ) is supported so as to be rotatable around. Here, the first joint portion 5311a may be configured such that the first axis O ₁ coincides with the optical axis of the imaging unit of the microscope unit 5303. Thus, by rotating the microscope section 5303 to the first about the shaft O _1, it is possible to change the view to rotate the captured image.

The first link 5313a fixedly supports the first joint portion 5311a at the tip. More specifically, the first link 5313a is a rod-shaped member having a substantially L-shaped, while stretching in the direction in which one side of the front end side is perpendicular to the first axis O _1, the end portion of the one side is first It connects to the 1st joint part 5311a so that it may contact | abut to the upper end part of the outer periphery of the joint part 5311a. The second joint portion 5311b is connected to the end portion on the other side of the substantially L-shaped base end side of the first link 5313a.

The second joint portion 5311b has a substantially cylindrical shape, and at the tip thereof, the base end of the first link 5313a can be rotated around a rotation axis (second axis O ₂ ) orthogonal to the first axis O _1. To support. The distal end of the second link 5313b is fixedly connected to the proximal end of the second joint portion 5311b.

The second link 5313b is a rod-shaped member having a substantially L-shaped, while stretching in the direction in which one side of the front end side is perpendicular to the second axis O _2, the ends of the one side of the second joint portion 5311b Fixedly connected to the proximal end. A third joint portion 5311c is connected to the other side of the base end side of the substantially L-shaped base of the second link 5313b.

The third joint portion 5311c has a substantially cylindrical shape, and at its tip, the base end of the second link 5313b is a rotation axis (third axis O ₃₎ orthogonal to the first axis O ₁ and the second axis O _2. ) Support so that it can rotate around. The distal end of the third link 5313c is fixedly connected to the proximal end of the third joint portion 5311c. The microscope unit 5303 is moved so as to change the position of the microscope unit 5303 in the horizontal plane by rotating the configuration on the distal end side including the microscope unit 5303 around the second axis O ₂ and the third axis O _3. Can be made. That is, by controlling the rotation around the second axis O ₂ and the third axis O ₃ , the field of view of the captured image can be moved in a plane.

The third link 5313c is configured such that the distal end side thereof has a substantially cylindrical shape, and the proximal end of the third joint portion 5311c has substantially the same central axis at the distal end of the cylindrical shape. Fixedly connected. The proximal end side of the third link 5313c has a prismatic shape, and the fourth joint portion 5311d is connected to the end portion thereof.

The fourth joint portion 5311d has a substantially cylindrical shape, and at the tip thereof, the base end of the third link 5313c can be rotated around a rotation axis (fourth axis O ₄ ) orthogonal to the third axis O _3. To support. The distal end of the fourth link 5313d is fixedly connected to the proximal end of the fourth joint portion 5311d.

Fourth link 5313d is a rod-shaped member extending substantially in a straight line, while stretched so as to be orthogonal to the fourth axis O _4, the end of the tip side of the substantially cylindrical shape of the fourth joint portion 5311d It is fixedly connected to the fourth joint portion 5311d so as to abut. The fifth joint portion 5311e is connected to the base end of the fourth link 5313d.

The fifth joint portion 5311e has a substantially cylindrical shape, and on the distal end side thereof, the base end of the fourth link 5313d can be rotated around a rotation axis (fifth axis O ₅ ) parallel to the fourth axis O _4. To support. The distal end of the fifth link 5313e is fixedly connected to the proximal end of the fifth joint portion 5311e. The fourth axis O ₄ and the fifth axis O ₅ are rotation axes that can move the microscope unit 5303 in the vertical direction. By rotating the distal end of the side structure including a microscope unit 5303 about the fourth shaft O ₄ and the fifth axis O _5, the height of the microscope unit 5303, i.e. by adjusting the distance between the observation target and the microscope section 5303 Can do.

The fifth link 5313e includes a first member having a substantially L shape in which one side extends in the vertical direction and the other side extends in the horizontal direction, and a portion extending in the horizontal direction of the first member in a vertically downward direction. A rod-shaped second member that extends is combined. The proximal end of the fifth joint portion 5311e is fixedly connected in the vicinity of the upper end of the portion of the fifth link 5313e extending in the vertical direction of the first member. The sixth joint portion 5311f is connected to the proximal end (lower end) of the second member of the fifth link 5313e.

The sixth joint portion 5311f has a substantially cylindrical shape, and supports the base end of the fifth link 5313e on the distal end side thereof so as to be rotatable about a rotation axis (sixth axis O ₆ ) parallel to the vertical direction. . The distal end of the sixth link 5313f is fixedly connected to the proximal end of the sixth joint portion 5311f.

The sixth link 5313f is a rod-like member extending in the vertical direction, and its base end is fixedly connected to the upper surface of the base portion 5315.

The rotatable range of the first joint portion 5311a to the sixth joint portion 5311f is appropriately set so that the microscope portion 5303 can perform a desired movement. As a result, in the arm portion 5309 having the above-described configuration, a total of 6 degrees of freedom of translational 3 degrees of freedom and 3 degrees of freedom of rotation can be realized with respect to the movement of the microscope unit 5303. In this way, by configuring the arm unit 5309 so that six degrees of freedom are realized with respect to the movement of the microscope unit 5303, the position and posture of the microscope unit 5303 can be freely controlled within the movable range of the arm unit 5309. It becomes possible. Therefore, the surgical site can be observed from any angle, and the surgery can be performed more smoothly.

The configuration of the arm portion 5309 shown in the figure is merely an example, and the number and shape (length) of the links constituting the arm portion 5309, the number of joint portions, the arrangement position, the direction of the rotation axis, and the like are desired. It may be designed as appropriate so that the degree can be realized. For example, as described above, in order to freely move the microscope unit 5303, the arm unit 5309 is preferably configured to have six degrees of freedom, but the arm unit 5309 has a greater degree of freedom (ie, redundant freedom). Degree). When there is a redundant degree of freedom, the arm unit 5309 can change the posture of the arm unit 5309 while the position and posture of the microscope unit 5303 are fixed. Therefore, for example, control that is more convenient for the operator can be realized, such as controlling the posture of the arm unit 5309 so that the arm unit 5309 does not interfere with the field of view of the operator who views the display device 5319.

Here, the first joint portion 5311a to the sixth joint portion 5311f may be provided with actuators mounted with a drive mechanism such as a motor, an encoder for detecting a rotation angle at each joint portion, and the like. Then, the drive of each actuator provided in the first joint portion 5311a to the sixth joint portion 5311f is appropriately controlled by the control device 5317, whereby the posture of the arm portion 5309, that is, the position and posture of the microscope portion 5303 can be controlled. . Specifically, the control device 5317 grasps the current posture of the arm unit 5309 and the current position and posture of the microscope unit 5303 based on information about the rotation angle of each joint unit detected by the encoder. Can do. The control device 5317 calculates the control value (for example, rotation angle or generated torque) for each joint unit that realizes the movement of the microscope unit 5303 according to the operation input from the user, using the grasped information. And the drive mechanism of each joint part is driven according to the said control value. At this time, the control method of the arm unit 5309 by the control device 5317 is not limited, and various known control methods such as force control or position control may be applied.

For example, when a surgeon performs an appropriate operation input via an input device (not shown), the drive of the arm unit 5309 is appropriately controlled by the control device 5317 according to the operation input, and the position and posture of the microscope unit 5303 are controlled. May be. By this control, the microscope unit 5303 can be moved from an arbitrary position to an arbitrary position and then fixedly supported at the position after the movement. In consideration of the convenience of the operator, it is preferable to use an input device that can be operated even if the operator has a surgical tool in his / her hand. Further, non-contact operation input may be performed based on gesture detection or gaze detection using a wearable device or a camera provided in an operating room. Thereby, even a user belonging to a clean area can operate a device belonging to an unclean area with a higher degree of freedom. Alternatively, the arm portion 5309 may be operated by a so-called master slave method. In this case, the arm unit 5309 can be remotely operated by the user via an input device installed at a location away from the operating room.

When force control is applied, the actuators of the first joint portion 5311a to the sixth joint portion 5311f are driven so that the external force from the user is received and the arm portion 5309 moves smoothly according to the external force. In other words, so-called power assist control may be performed. Thus, when the user grips the microscope unit 5303 and tries to move the position directly, the microscope unit 5303 can be moved with a relatively light force. Accordingly, the microscope unit 5303 can be moved more intuitively and with a simpler operation, and the convenience for the user can be improved.

Also, the driving of the arm portion 5309 may be controlled so as to perform a pivoting operation. Here, the pivoting operation is an operation of moving the microscope unit 5303 so that the optical axis of the microscope unit 5303 always faces a predetermined point in space (hereinafter referred to as a pivot point). According to the pivot operation, the same observation position can be observed from various directions, so that more detailed observation of the affected area is possible. Note that in the case where the microscope unit 5303 is configured such that its focal length cannot be adjusted, it is preferable that the pivot operation is performed in a state where the distance between the microscope unit 5303 and the pivot point is fixed. In this case, the distance between the microscope unit 5303 and the pivot point may be adjusted to a fixed focal length of the microscope unit 5303. As a result, the microscope unit 5303 moves on a hemispherical surface (schematically illustrated in FIG. 18) having a radius corresponding to the focal length centered on the pivot point, and is clear even if the observation direction is changed. A captured image is obtained. On the other hand, when the microscope unit 5303 is configured to be adjustable in focal length, the pivot operation may be performed in a state where the distance between the microscope unit 5303 and the pivot point is variable. In this case, for example, the control device 5317 calculates the distance between the microscope unit 5303 and the pivot point based on the information about the rotation angle of each joint unit detected by the encoder, and based on the calculation result, the microscope 5317 The focal length of the unit 5303 may be automatically adjusted. Alternatively, if the microscope unit 5303 is provided with an AF function, the focal length may be automatically adjusted by the AF function every time the distance between the microscope unit 5303 and the pivot point is changed by the pivot operation. .

Also, the first joint portion 5311a to the sixth joint portion 5311f may be provided with a brake that restrains the rotation thereof. The operation of the brake can be controlled by the control device 5317. For example, when it is desired to fix the position and posture of the microscope unit 5303, the control device 5317 activates the brake of each joint unit. Accordingly, since the posture of the arm unit 5309, that is, the position and posture of the microscope unit 5303 can be fixed without driving the actuator, power consumption can be reduced. When it is desired to move the position and posture of the microscope unit 5303, the control device 5317 may release the brake of each joint unit and drive the actuator according to a predetermined control method.

Such an operation of the brake can be performed according to an operation input by the user via the operation unit 5307 described above. When the user wants to move the position and posture of the microscope unit 5303, the user operates the operation unit 5307 to release the brakes of the joint units. Thereby, the operation mode of the arm part 5309 shifts to a mode (all free mode) in which the rotation at each joint part can be freely performed. In addition, when the user wants to fix the position and posture of the microscope unit 5303, the user operates the operation unit 5307 to activate the brakes of the joint units. Thereby, the operation mode of the arm part 5309 shifts to a mode (fixed mode) in which rotation at each joint part is restricted.

The control device 5317 comprehensively controls the operation of the microscope operation system 5300 by controlling the operations of the microscope device 5301 and the display device 5319. For example, the control device 5317 controls the driving of the arm portion 5309 by operating the actuators of the first joint portion 5311a to the sixth joint portion 5311f according to a predetermined control method. Further, for example, the control device 5317 changes the operation mode of the arm portion 5309 by controlling the brake operation of the first joint portion 5311a to the sixth joint portion 5311f. Further, for example, the control device 5317 performs various kinds of signal processing on the image signal acquired by the imaging unit of the microscope unit 5303 of the microscope device 5301 to generate image data for display and display the image data. It is displayed on the device 5319. In the signal processing, for example, development processing (demosaic processing), high image quality processing (band enhancement processing, super-resolution processing, NR (Noise reduction) processing and / or camera shake correction processing, etc.) and / or enlargement processing (that is, Various known signal processing such as electronic zoom processing may be performed.

Note that communication between the control device 5317 and the microscope unit 5303 and communication between the control device 5317 and the first joint unit 5311a to the sixth joint unit 5311f may be wired communication or wireless communication. In the case of wired communication, communication using electrical signals may be performed, or optical communication may be performed. In this case, a transmission cable used for wired communication can be configured as an electric signal cable, an optical fiber, or a composite cable thereof depending on the communication method. On the other hand, in the case of wireless communication, there is no need to lay a transmission cable in the operating room, so that the situation where the transmission cable prevents the medical staff from moving in the operating room can be eliminated.

The control device 5317 may be a processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit), or a microcomputer or a control board in which a processor and a storage element such as a memory are mixedly mounted. The various functions described above can be realized by the processor of the control device 5317 operating according to a predetermined program. In the illustrated example, the control device 5317 is provided as a separate device from the microscope device 5301, but the control device 5317 is installed inside the base portion 5315 of the microscope device 5301 and integrated with the microscope device 5301. May be configured. Alternatively, the control device 5317 may be configured by a plurality of devices. For example, a microcomputer, a control board, and the like are arranged in the microscope unit 5303 and the first joint unit 5311a to the sixth joint unit 5311f of the arm unit 5309, and these are communicably connected to each other. Similar functions may be realized.

The display device 5319 is provided in the operating room, and displays an image corresponding to the image data generated by the control device 5317 under the control of the control device 5317. In other words, the display device 5319 displays an image of the surgical part taken by the microscope unit 5303. Note that the display device 5319 may display various types of information related to the surgery, such as information about the patient's physical information and the surgical technique, for example, instead of or together with the image of the surgical site. In this case, the display of the display device 5319 may be switched as appropriate by a user operation. Alternatively, a plurality of display devices 5319 may be provided, and each of the plurality of display devices 5319 may display an image of the surgical site and various types of information regarding surgery. Note that as the display device 5319, various known display devices such as a liquid crystal display device or an EL (Electro Luminescence) display device may be applied.

FIG. 18 is a diagram showing a state of surgery using the microscope surgery system 5300 shown in FIG. In FIG. 18, a state in which an operator 5321 performs an operation on a patient 5325 on a patient bed 5323 using a microscope operation system 5300 is schematically shown. In FIG. 18, for the sake of simplicity, the control device 5317 is omitted from the configuration of the microscope surgery system 5300 and the microscope device 5301 is illustrated in a simplified manner.

As shown in FIG. 18, at the time of surgery, an image of the surgical part taken by the microscope apparatus 5301 is enlarged and displayed on the display device 5319 installed on the wall of the operating room using the microscope operation system 5300. The display device 5319 is installed at a position facing the surgeon 5321, and the surgeon 5321 observes the state of the surgical site by an image projected on the display device 5319, for example, the surgical site such as excision of the affected site. Various treatments are performed on

Heretofore, an example of the microscopic surgery system 5300 to which the technology according to the present disclosure can be applied has been described. Here, the microscopic surgery system 5300 has been described as an example, but a system to which the technology according to the present disclosure can be applied is not limited to such an example. For example, the microscope apparatus 5301 can function as a support arm apparatus that supports another observation apparatus or another surgical tool instead of the microscope unit 5303 at the tip. As the other observation device, for example, an endoscope can be applied. In addition, as the other surgical tools, forceps, a lever, an insufflation tube for insufflation, or an energy treatment instrument for incising a tissue or sealing a blood vessel by cauterization can be applied. By supporting these observation devices and surgical tools with the support arm device, it is possible to fix the position more stably and reduce the burden on the medical staff than when the medical staff supports it manually. It becomes possible to do. The technology according to the present disclosure may be applied to a support arm device that supports a configuration other than the microscope unit.

Thus, by using the medical light source device capable of increasing the amount of output light according to the present technology, it is possible to image an observation target region under irradiation light with an increased amount of light. As a result, various treatments can be performed on the surgical site more accurately, for example, excision of the affected area, while observing the state of the surgical site displayed in a bright image.

In addition, this technique can also take the following structures.
(1) A broadband light source that emits broadband light having a wavelength band including a visible region, a plurality of narrow band light sources that emit narrow band light having a narrower wavelength band than the broadband light, and a plurality of narrow band light sources respectively. A medical light source device comprising: the narrow band light having the same polarization direction; and an optical element comprising a dielectric multilayer film on which the broadband light is incident;
A microscope system comprising: a microscope that is connected to the medical light source device and guides output light from the medical light source device.
(2) a broadband light source that emits broadband light having a wavelength band including the visible region;
A plurality of narrowband light sources that emit narrowband light having a narrower wavelength band than the broadband light;
A medical light source device comprising: the narrow band light emitted from each of the plurality of narrow band light sources and having the same polarization direction and an optical element including a dielectric multilayer film on which the broadband light is incident.
(3) The medical light source device according to (2) above,
The optical element transmits a plurality of the narrow-band lights whose incident polarization directions are all P-polarized light and reflects the incident broadband light.
(4) The medical light source device according to (2) above,
The optical element reflects a plurality of the narrow-band lights whose incident polarization directions are all S-polarized light and transmits the incident broadband lights.
(5) The medical light source device according to any one of (2) to (4) above,
The optical element is a wavelength selection element.
(6) The medical light source device according to any one of (2) to (4) above,
The optical element is a polarization selection element.
(7) The medical light source device according to any one of (2) to (6) above,
A first lens group that is located between the broadband light source and the optical element, collimates the incident broadband light, and emits the light toward the optical element;
A second lens group positioned between the narrow-band light source and the optical element, collimating the plurality of narrow-band lights having the same polarization direction and emitting the collimated light toward the optical element; ,
A third lens group that receives light from the optical element and emits it as illumination light; and
Each of the first lens group, the second lens group, and the third lens group is made of a glass material having a refractive index Nd of greater than 1.70 and less than 1.85, and an Abbe number νd of greater than 40 and less than 55. A medical light source device.
(8) The medical light source device according to (7) above,
The medical light source device, wherein the first lens group, the second lens group, and the third lens group include an antireflection film having the same antireflection characteristic.
(9) The medical light source device according to any one of (2) to (8) above,
The medical light source device, wherein the broadband light is white light.
(10) The medical light source device according to any one of (2) to (9),
The narrow-band light is a laser beam.
(11) The medical light source device according to (10), wherein the medical light source device is configured to be connectable to a microscope or an endoscope.

DESCRIPTION OF SYMBOLS 1, 101 ... Endoscope system 2 ... Endoscope 3 ... Observation object part (irradiated body)
5, 105, 205, 305, 5157, 5330 ... Light source device (medical light source device)
51: Broadband light source 52IR: IR light source (narrowband light source)
52R ... R light source (narrow band light source)
52G ... G light source (narrowband light source)
52B ... B light source (narrowband light source)
53, 153 ... Dichroic mirror (optical element, wavelength selection element)
54 ... 1st collimating lens (1st lens group)
55. Second collimating lens (second lens group)
56 ... Condensing lens (third lens group)
254, 354 ...

First lens group

256, 356 ... Third lens group 5113 ... Endoscopic surgery system 5300 ... Microscopic surgery system 5303 ... Microscope section (microscope)
G1, G31: second collimating lens (second lens group)

Claims

A broadband light source that emits broadband light having a wavelength band including a visible region, a plurality of narrow band light sources that emit narrow band light having a narrower wavelength band than the broadband light, and a plurality of narrow band light sources, respectively, A medical light source device comprising: the narrowband light having the same polarization direction; and an optical element including a dielectric multilayer film on which the broadband light is incident;
A microscope system comprising: a microscope that is connected to the medical light source device and guides output light from the medical light source device.
A broadband light source that emits broadband light having a wavelength band including the visible region;
A plurality of narrowband light sources that emit narrowband light of a narrower wavelength band than the broadband light;
A medical light source device comprising: the narrowband light emitted from each of the plurality of narrowband light sources and having the same polarization direction and an optical element including a dielectric multilayer film on which the broadband light is incident.
The medical light source device according to claim 2,
The optical element transmits a plurality of the narrowband light whose incident polarization directions are all P-polarized light and reflects the incident broadband light.
The medical light source device according to claim 2,
The optical element reflects a plurality of the narrowband light whose incident polarization directions are all S-polarized light and transmits the incident broadband light.
The medical light source device according to claim 3 or 4,
The optical element is a wavelength selection element.
The medical light source device according to claim 3 or 4,
The optical element is a polarization selection element.
The medical light source device according to claim 5 or 6,
A first lens group positioned between the broadband light source and the optical element, collimating the incident broadband light and emitting it toward the optical element;
A second lens group positioned between the narrowband light source and the optical element, collimating the plurality of narrowband lights having the same polarization direction and emitting the collimated light toward the optical element; ,
A third lens group that receives light from the optical element and emits it as illumination light; and
Each of the first lens group, the second lens group, and the third lens group is made of a glass material having a refractive index Nd of greater than 1.70 and less than 1.85 and an Abbe number νd of greater than 40 and less than 55. A medical light source device.
The medical light source device according to claim 7,
The first lens group, the second lens group, and the third lens group have an antireflection film having the same antireflection characteristic.
The medical light source device according to claim 8,
The broadband light is white light.
The medical light source device according to claim 9,
The narrow band light is a laser beam.
The medical light source device according to claim 10,
The medical light source device is configured to be connectable to a microscope or an endoscope.