JPH01211715A - Light source device for endoscope - Google Patents

Abstract

PURPOSE:To prevent the incident end surface of a light guide from being burnt and damaged with illuminating light by detecting that a filter which can be freely inserted and pulled out between a light source and an object is pulled out from an optical path and controlling the quantity of illuminating light emitted from the light source. CONSTITUTION:A light source control means 115 is provided, which detects that the filter cassette 38 is pulled out and controls the quantity of the illuminating light emitted from the light source 31. Therefore, the quantity of incident light onto the light guide 14 is increased by the light quantity control means 115 when the filter 38 is inserted and the light quantity is decreased when the filter 38 is pulled out. Since an automatic dimming circuit 115 can be directly actuated as well as through a three primary colors signal by providing a switch 87 for detecting that the filter cassette 38 is inserted and pulled out, the illuminating light made incident on the incident end surface of the light guide can be decreased immediately even when the filter cassette 38 is pulled out. Then, the incident end surface of the light guide can be surely prevented from being burnt and damaged.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides illumination light suitable for a scope equipped with a field-sequential imaging means, a scope equipped with a color mosaic imaging means, and a fiberscope. It is related to light source devices for endoscopes that can be used.

[Problems to be solved by conventional techniques and inventions] In recent years,
By inserting the elongated insertion part into the body cavity, an endoscope (
Also called scope or fiber scope. ) is widely used.

Furthermore, various electronic scopes using solid-state imaging devices such as charge-coupled devices (CCDs) as imaging means have been proposed. This electronic scope has advantages such as higher resolution than the FiPass, easier to record and play back images, and easier to perform image processing such as enlarging images and comparing two images. .

The color image capturing method of the electronic scope includes, for example, J: sea urchin disclosed in Japanese Patent Application Laid-open No. 61-8273'1, and the illumination light is divided into R (red), G (green), B (blue), etc. For example, as shown in Japanese Unexamined Patent Publication No. 60-76888, R, G,
There is a color mosaic type (also called a simultaneous type) in which a filter array is provided in which color filters that transmit color light such as B are arranged in a mosaic shape or the like. The frame sequential method has the advantage that the number of pixels can be reduced compared to the color mosaic method, while the color mosaic method has the advantage of not causing color shift.

Further, the electronic scopes are diversified depending on the purpose of use. For example, for upper or lower gastrointestinal use,
Those with an insertion portion having an outer diameter of around 10φ are used.

On the other hand, for example, for use in the bronchus, an outer diameter of approximately 5φ or less is usually required. As described above, it is physically and performance-wise impossible to use the same type of image pickup element and the same type of image pickup method for various electronic scopes whose insertion portions have a wide range of outer diameters. That is, for example, in order to realize an electronic scope for the bronchus (small diameter), an image sensor with a small number of pixels must be used.

In this case, when the number of pixels is small, in order to prevent a decrease in resolution, R, G is used rather than a color mosaic type imaging method using a color mosaic filter.

It is advantageous to use a field-sequential (J-ra) imaging method in which light of each wavelength of B is sequentially illuminated in the r-plane, images are taken sequentially under the illumination, and these images are combined and displayed in color.

On the other hand, for those with an outer diameter of about 10φ, it is advantageous to increase the number of pixels and use a color mosaic imaging method to improve image quality.

Incidentally, the fiber scope or electronic scope is generally used by being connected to an optical device that supplies illumination light suitable for each scope.

The fiber scope, the field-sequential electronic scope, and the color mosaic electronic scope have different illumination methods.

That is, fiber scopes and color mosaic type electronic scopes require white light, and field sequential type electronic scopes require light that is sequentially switched to R, G, B, etc. Furthermore, even with the same field-sequential wL imaging method, it is necessary to change the spectral intensity of the illumination light and the blanking period depending on the type of solid-state image sensor and the purpose of the endoscope. However, it is necessary to use different light source devices and perform different operations, resulting in poor economy and efficiency.

In order to solve the above problems, the applicant proposed R.
A technology has been proposed in which a filter that can transmit wavelengths of , G, and B is removably installed in a light source device, so that even one light source device can be used with endoscope devices of various imaging methods. There is. By the way, if you remove this filter,
As the amount of illumination light emitted from the light source increases, there is a possibility that the incident end face of the light guide that transmits the illumination light to the observation area may be burned out, and the technique proposed by the applicant mentioned above does not take this problem into account. It wasn't there.

[Object of the invention] The present invention has been made in view of the above circumstances, and includes R,
It is an object of the present invention to provide a light source device for internal DI H in which a light guide entrance end face is not burned out by illumination light even when a filter that transmits each of the G and B wavelengths is removed.

[Means and operations for solving the problems] The present invention is equipped with a light amount control means that detects that the filter is removed and can control the illumination light m emitted from the light source.

That is, by this light amount control means, the amount of light incident on the light guide is increased when the filter is inserted, and the amount of light is reduced when the filter is removed.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

1 to 14 show one embodiment.

The endoscope device 1 shown in FIGS. 4(a) to 7 houses the light source device of this embodiment and a video processor that processes video signals, )
It is equipped with a control device 1a that can connect any of 2A, 2B, 2G, 2D, and 2E. As shown in the figure, there are five types of scopes, namely, the field sequential electronic scope 2A1, the color mosaic electronic scope 2B using a color mosaic filter, the firebus scope with an external field sequential television camera, and the following. It is called a fiberscope with a field-sequential television camera. ) 2G, fiberscope with external color mosaic TV camera (
Hereinafter, it will be referred to as a fiberscope with a color mosaic television camera. ) 2D, and fiberscope 2F.

Each of the scopes 2A, 2B, 2C, 2D, and 2E has an elongated insertion section 3 and an operation section 4 connected to the rear end of the insertion section 3. - A reel iodine is extended, and light source connectors 5A, 5B,
5G, 5D, and 5E are installed.Furthermore, a field-sequential electronic scope 2A and a color mosaic electronic scope 2 are installed.
In B, on the tip side of the universal cord 4a, in addition to the light source = 1 connector 5A, 5B, the signal = 1 connector 6△
, 61:3 is installed.Furthermore, the Fiberscope 2C with a sequential TV camera and the Fiberscope 2D with a color mosaic TV camera are equipped with a Fiberscope with a 61:3 ratio.
It has a structure in which a frame-sequential TV camera 8G and a color mosaic TV camera 8[] are installed in the eyepiece section 7 of 1-2F, and are extended from each TV camera 8C and 8D to the tip of the signal group. Signal connectors 6C and 6D are provided.

Connectors 5A, 6Δ; 5B, 68; 5C of the scopes 2A, 2B, 2C, 2D, 2E (hereinafter, if common to all these scopes, they are represented by the symbol @2)
, 6C; Control i11 device 1a so that 5D, 6D, and bE can be connected and each scope 2 can be set to a usable state.
For example, a set of connector sockets is provided on the curved surface of the housing.

These connector sockets [P] are light source connector sockets (P11,
It consists of a signal connector receiver 12. The light source connector receiver (11) is shaped to be able to connect the light source connectors 5A, 5B, 5G, 5D, and 5F of the respective scopes 2 of the same shape. The signal connector receivers 12 adjacent to the lower side of the signal connectors 11 are the signal connectors 6A and 6B of the respective scopes 2 having the same shape.

It has a shape that allows connection of 6C and 611 respectively.

When using the above-mentioned fibre-pass lobe 2F, it is possible to observe with the naked eye, but with the other scope 2A.

When using 2B, 2C, and 2D, connect it to the signal node j end of the control device 1a and use the IC color monitor 13 to
Captured images can be displayed on the screen.

Incidentally, the light source connector 5△ in each space]-12.

5B, 5G, 5D, and 5E are provided with a light guide connector and an air/water supply connector (not shown) in this embodiment, and the connector receiver 11 is also structured to connect these. . Furthermore, for signal = 1 connector 6A,
A scope length determination resistor and an electrostatic protection resistor (not shown) are provided in 6B, 6C, and 6D, and the signal connector receiver 12 is also structured to connect these.

A light guide 14 for transmitting illumination light is inserted through each sprue 2, and the illumination light supplied to the input end surface from the light source section 15a of the light source device 15 in the control device 1a is directed to the output end surface side. Transmit and get out! The object side in front can be illuminated through a light distribution lens 16 placed in front of the 8 end faces.

Further, in each of the scopes 2, an objective lens 17 for imaging is disposed at the distal end of the insertion section 3. This objective lens 1
At the imaging position 7, a solid-state imaging device 18 such as a COD is disposed in the field-sequential or color mosaic type double-lens probe 2A or 2B, and on the other hand, a solid-state imaging device 18 such as a COD is disposed at the imaging position of the fiber-pass lobe 2[, a television camera. A TV camera equipped with 8C or 81 is used with fiber path robe 2C or 2D.
The image guide 19 is arranged so that the entrance end face thereof faces. Further, an eyepiece lens 21 is disposed opposite to the output end surface of the image guide 19, and in the fiber scope 2F, observation with the naked eye can be performed by bringing the eyepiece 7 close to the eyepiece 7. ing.

On the other hand, in the case where a field-sequential television camera 8C or a color 1149-type television camera 8D is attached to the eyepiece 7 of the fiberscope 2F, each camera is placed opposite the eyepiece 21 through an imaging lens (not shown). A solid-state image sensor 22 is provided.

The solid-state image sensor 18 or 22 constituting the image carrying means is
The optical image focused on the imaging surface is photoelectrically converted, and the preamplifier 2
After being amplified by signal connector 6 (6A, 6B, 6C), the signal is amplified by signal connector 6 (6A, 6B, 6C).

Represents 6D. ) and is input to the video processor 25a or 25b via the signal receiver 12 to which this connector 6 is connected.

Further, a clock for driving the solid-state image sensor is applied to each solid-state image sensor 18 or 22 from the driver 26a or 26b of the video processor 25a or 25b.
: Sea urchins are turning.

In addition, for scopes other than the fiberscope 2E, a type signal i generation circuit 2 that outputs a type signal for scope identification is provided.
7A, 27B, and 270.27D are provided, and are identified by the identification circuit 28 in the control device 1a via the signal connector 6.

By the way, inside the control device 1a which can be connected to any of the scopes 2, as shown in FIG. 4(a), a light source section 15 is installed.
a light source device 15 consisting of a light source device 15, and two sets of video processors 2.
5a and 2bb are stored.

The light source section 15a of the optical KA device 15 is shown in FIGS.
In the figure, a light source lamp 31 that emits white light, and a connection 7 between the light source lamp 31 and the incident end surface of the light guide 140 are shown.
On the S optical path, there is an aperture 35 that is driven by an aperture motor 31 to adjust its tip, and a filter that is inserted when the field sequential electronic scope 2A and the field sequential television camera 8C are connected to the light source device 15. The transmitted light of the rotating filter 33 is focused on the incident end face of the cassette 38 and the parallel light lens 3 (5) and the light guide 14 for converting the white light incident on the rotating filter 33 provided in the filter cullet 38 into parallel light. A condensing lens 37 that emits light is provided.

The rotary filter 33 has a disc shape, and has color transmission filters 32R, 32G, and 32B of three primary colors, red (R), green (G), and blue (B), in the circumferential direction of the plate surface, The white light emitted from the light source lamp 31 is used as illumination light of each wavelength of red, green, and blue, and it is possible to emit illumination light suitable for the frame-sequential type electronic screen 2A and the frame-sequential type television camera 8C. There is. Note that this filter cassette 38 includes a mosaic type electronic scope 2B and a mosaic type television camera 8 in the light source device 15.
When D and the fiber scope 2E are connected, it can be removed to emit white light suitable for each scope.

A plurality of holes 47, 4.7, . . . are provided in the circumferential direction on the inner diameter side of the color transmission filters 32R, 32G, 32B for detecting the timing of reading signals from the solid-state image sensor.

The rotating filter 33 is housed in a filter cassette 1-38, and a rotating shaft 40 is supported at the center of rotation of the rotating filter 33 by ball bearings 39 and 39, and is provided at the center of the filter cassette 38. It is provided.

Windows 50, 50 are provided on the front plate 48 and rear plate 49 of the filter current 38, so that the white light emitted from the light source lamp 31 can pass through the color transmission filters 32R932G and 32B.

Furthermore, windows 53 and 53 are provided on the front plate 48 and the rear plate 49 facing the timing detection hole 47, and a light emitting element 74, for example, is arranged so as to face the hole 47 from one window 53. For example, a photosensor 75 is provided so as to face the hole 47 from the other window 53.

A hole 66 having grooves 51 and 51 provided in the axial direction is provided in the front end surface of the rotating shaft 40, and a window 67 is provided in the center of the front plate 48 so as to face the hole 66. It is provided.

The hole 66 has six pins projecting in the radial direction.

69 is provided to coincide with the groove portion 51.51,
A drive shaft 68 of a rotary filter drive motor 70 supported by a sliding bearing 72a is inserted.

In front of the rotary filter drive motor 70, a substantially cylindrical attachment/detachment knob 73 is connected, passing through, for example, the front plate 71 of the control device 1a and supported by a sliding bearing 72b.

In the filter cassette 38, information such as the spectral intensity of the illumination light transmitted through the rotary filter 33 and the blanking period is stored, for example, by a ROM (read-only memory), a combination of contacts, etc., in order to determine the type of filter. A green section 83 indicating the type of filter is provided, and is connected to a contact 84 provided on the side surface of the filter cassette 38.

As shown in FIG. 3, the filter cassette 38 is inserted, for example, through an opening 78 provided on the top plate 77 of the control device 1a, and is positioned by positioning pins 79 and 79 provided on the bottom plate 86 of the filter cassette 38. It has become so. After positioning, by pushing the attachment/detachment knob 73 in the direction of the control device 1a, the drive shaft 68 of the rotary filter drive shaft 70 is inserted into the hole 66 provided in the rotary shaft 40 that supports the rotary filter 33. and are connected to each other so that rotation can be transmitted.

Furthermore, at the same time as this positioning, the bottom plate 86 of the filter cassette 38 turns on a switch 87.
This switch 870 on signal is input to the automatic dimming circuit 115. This automatic light control circuit 115 operates the aperture motor 34 to close the aperture 35 when an ON signal is input, thereby avoiding an increase in the amount of illumination light incident on the color transmission filters 32R, 32G, and 32B. It has become.

When the filter cullet 38 is removed, the switch 8
7 is turned off, and the automatic light control circuit 115 turns off the aperture motor 3.
4 operates the diaphragm 35 to narrow down the large amount of illumination light flowing from the light 1 to the guide entrance end face.

The contact point 84 of the filter type recording section 83 is connected to the timing generator 52 in the control device 1a at the same time as the filter cassette 38 is positioned, and records the type and characteristics of the inserted rotary filter 33. The signal is transmitted to the timing generator 52, and a signal corresponding to the signal can be outputted to the frame-sequential process circuit 41a, the mosaic process circuits 4 and 1b, the drivers 26a and 26b, the output circuit 80, and the driver 116.

The driver 116 drives the rotary filter driving motor 70 in response to a synchronization signal from the timing generator 52 that is compatible with the rotary filter 33 .

Note that the above-mentioned photo sensor 75 synchronizes the timing of the output of the timing generator 52 with the rotation of the rotary filter 33, and
The output of is adapted to control the timing of the frame sequential process circuit 4.18.

By the way, one of the video processors l+ 258 is for frame-sequential signal processing, and the signal input to the signal input terminal of the frame-sequential type Ig connector receiver 12 is sent to the frame-sequential process circuit 41a. The signals inputted to the image sensor and imaged under illumination light of each wavelength of R, G, and B are output as color signals R, G, and B. These color signals R and G.

B is output by the output circuit 80 from the three primary color output terminal 43 as a three primary color signal RGB. Further, the color signals R, G
, B are converted to NTSC composite video signals,
It is output from the SC output terminal 46.

The frame-sequential process circuit 41a is configured as shown in FIG. 8, for example.

That is, the im signal inputted through the preamplifier is inputted to the lean pull-hold circuit 54, sampled and held, then subjected to γ correction in the γ correction circuit 55, and converted into a digital signal by the A/D converter 56. Then, the signals transferred through the multiplexer 57, which is switched by the signal from the timing generator 52, under the sequential illumination of R, G, and B are stored in the R frame memory 58R, the G frame memory 58G, and the B frame memory 58B. written.

Each of these frame memories 58R, 58G, 58B (signal data written therein is read out simultaneously, and each D/A
:1 is converted into analog color signals R2G and B by the inverter 59 and output to the output circuit 80.

On the other hand, the signals captured by the solid-state image sensor 18 or 22 of the color mosaic electronic scope 2B and the mosaic fiber scope 2F are input to the color mosaic process circuit 4lb, and the luminance signal is Y1 color difference signals R-Y and B-Y are output. This signal is input to the output circuit 80, converted into an NTSC composite video signal, and outputted from the NTSC output terminal 46.
Y is converted into color signals R, G, and B by the output circuit 80, and three primary color signals RGB are output from the three primary color signal output terminal 43.

The color mosaic type process circuit 41b is configured, for example, as shown in FIG.

That is, the solid-state image sensor 1 amplified by the preamplifier 24
The signal from 8 or 22 passes through a brightness signal processing circuit 61 to generate a brightness signal Y. In addition, the color signal reproducing circuit 62
and the color difference signal R-Y.

B-Y is generated in time series for each horizontal line, white balance compensated by the white balance circuit 63, one is sent directly to the analog switch 64, and the other is delayed by one horizontal line by the 1H delay line 63a and sent to the analog switch. 64a, and the timing generator 52
The color difference signals R-Y and B-Y are obtained by the switching signal.

Note that the timing generator 52 applies signals to the drivers 26a, 26b and an NTSC encoder (not shown), respectively, and performs control so that signal processing is performed in synchronization with a drive pulse used for signal reading ratio from the solid-state image sensor 18 or 22. In this case, the frame sequential video processor 25
In a, as described above, the timing generator 52 is synchronized with the rotary filter 33 by the output of the photosensor 75.

By the way, the type signal generation circuits 27A and 27B.

270.27D is formed, for example, by connecting resistors with different resistance values between two terminals. It is possible to identify which scope is connected.

The identification circuit 28 controls switching of the changeover switch 103 in addition to controlling both drivers 26a and 26b. For example, when the frame-sequential scope 2A or 2C is connected, it is switched to the frame-sequential side, and the drive pulse of the driver 26a is applied to the solid-state image sensor 18 via the connector, and the signal read from the solid-state image sensor 18 is is input to the frame sequential process circuit 41a.

On the other hand, if the field sequential type scopes 2A and 2C are not connected, the mosaic type process circuit side is selected. Incidentally, the case of the mosaic type scope 2B or 2D may be detected and the changeover switch 103 may be switched to the mosaic type side.

The identification circuit 28 also sends a control signal to the timing generator 52 so that it can handle either method.

Further, as shown in FIG. 10, the output circuit 80 includes a 3-circuit, 2-contact changeover switch 81 between the output end of the matrix circuit 44a and the NTSC encoder 45, and the output end of the inverse matrix circuit 4.4b. A three-circuit, two-contact changeover switch 82 is also provided between the driver and the buffer 42 forming the driver.

When one contact side of the changeover switch 81 is turned on, the signal from the matrix circuit 44a is guided to the common NTSC encoder 45, and this NTS'C encoder 45
It is converted into a TSC video signal and outputted from a common NTSC output terminal 46. Also, when the other contact side is selected,
The signal from the mosaic processing circuit 41b is guided to an NTSC encoder 45 and output from a common NTSC output terminal 46.

On the other hand, as for the other switch 82, when the frame sequential type side is selected, the output signal of the frame sequential type process circuit 41a passes through the common buffer 42 forming a driver, and one is outputted to the automatic dimming circuit 115. , the other is a common RG
Three primary color signals are output from the B output terminal 43. Furthermore, when the mosaic process circuit side is selected, the three primary color signals R, G, and B that have passed through the inverse matrix circuit 44b are outputted on one side to the automatic light control circuit 115, and on the other hand, outputted from the common RGB output terminal 43. be done.

Each of the changeover switches 81 and 82 can be manually switched, or they can be switched in conjunction with each other.

The automatic light control circuit 115 receives, for example, three primary color signals R, G,
A brightness signal is generated from B and integrated, and the aperture motor 34 is driven to adjust the aperture 35 so that the magnitude of this brightness signal is constant.

In addition, as shown in FIG. 11, it is also possible to prevent erroneous insertion of the filter cassette 38 into the filter cassette l.

In FIG. 11(a), the filter cassette 38 is provided with a recess 89 into which a cassette holding member 88 can be inserted. This recess 89 has a side plate 92 of the filter cassette 38.
A pin 91 that can be fitted into a hole 93 provided in the holder is provided in a protruding manner. Furthermore, in FIG. 11<b>, one edge 94 of the filter cassette 38 protrudes in the thickness direction of the cassette 38, and if the insertion direction is incorrect, this edge 94 will come into contact with the cassette holding member 88. are in contact with each other and cannot be inserted.

Further, as shown in FIG. 12, when the rotary filter 33 is rotating, the filter cassette 38 may not be removed.

In FIG. 12, a frequency generator 96 that can generate a signal such as a pulse wave is installed at the rear end of a rotary filter motor 70 (7) that drives the rotary filter 33 only when the motor 70 is being driven. Being beaten. The signal from this frequency generator 96 is input to a rotation/+°:"/stop detection circuit 97. The rotation/stop detection circuit 97 is connected to a solenoid 99 having a pin 98 inserted into a hole 93 in a side plate 92 of a filter cullet 38. This rotation/stop detection circuit 97 detects pin 9 when a pulse wave is applied manually.
8 is protruded to prevent the filter current 38 from being accidentally removed. Further, when the rotation of the rotary filter 33 stops and the pulse wave is no longer input, the pin 98 is retracted so that the filter cassera 1 to 38 can be removed.

Furthermore, when the window 50 of the filter cullet 38 is provided with a cover and removed as shown in FIGS. 13 and 14, the window 5
It may be possible to prevent dust and the like from entering.

In FIG. 13, a window 50 through which the illumination light of the cassette filter 38 passes is provided with an M2O3 which can be slid up and down. At the bottom of this lid 106 is a flange portion 1.0.
7 is provided, and the end of this flange portion 107 forms a claw portion 108 that projects in the lateral direction of the filter cassette 38 . A spring 109 whose one end is supported by the filter cassette 38 is locked to this flange portion 107, and when the lid 106 is opened, the spring 109
09 is energized. When the filter cassette 38 is inserted in the direction of arrow R, the claw portion 108
When the cassette filter 38 is removed, the spring 109 closes the lid 106 by contacting the protrusion 111 that is attached to the light source device 15 and biasing the spring 109. is closed to prevent dust from entering.

In FIG. 14, the filter cullet 38 has a drive shaft 6.
An opening 121 is formed in which an insertion port 8 and an illumination light window are integrated. During this time, the two shutter blades 122 and 123 that close the 11 section 121 are pivotally connected to the shaft 12=1.126 fixed to the filter cassette 38, with fixing pins 127 and 128 on the cassette side and fixing pins 129 on the shutter blade side. Tension springs 132, 133 between ゜131
are urged to rotate relative to each other and close and cover the opening 121. The side plates of the filter cassette 38 are provided with hooks 134 and 136 that slide along the side edges, and when the filter cassette 38 is inserted in the direction of arrow R, they engage with protrusions (not shown) on the light source device side. The V ivy blades 122 are attached to the hooks 134 and 136 through guide rollers 137 and 138, and are slid in the direction of the arrow.
．． The shutter blades 122, 123 are opened by wires 142, 143 fixed to the tilt stops 139, 141 of the shutter 123.

Note that the shutter blade 122. '123 has stopper I
Il! Filter holders 14, 7, and 148 are provided to prevent the rotating filter 33 from rattling when the rotating filter 33 is not in use.

In the above embodiment, the insertion and removal of the filter cassette 38 is detected by the on/off switch 87, but the present invention is not limited to this embodiment, and other detection means such as a light emitting diode and a first transistor can be used. You may.

Alternatively, the signal generated by the filter type recording section 83 may be input to the automatic light adjustment circuit 115 to operate the diaphragm 35.

Furthermore, as a means for controlling the amount of light, the illumination light incident on the light guide entrance end surface may be defocused by moving the condensing lens 37.

Furthermore, the color transmission filters 32R, '32G, and 32B may be filters for special observation such as infrared observation.

Further, the amount of light emitted from the light source lamp 31 may be reduced.

In the present invention, the automatic dimming circuit 115 is provided with a switch 87 that can detect insertion and removal of the filter cassette 38.
can be operated not only via the three primary color signals but also directly, so even if the filter cassette 38 is removed, the illumination light incident on the light guide entrance end face can be quickly narrowed down, ensuring that the light guide entrance end face is not burnt out. can be prevented.

[Effects of the Invention] As described above, according to the present invention, even when the filter that can transmit each wavelength of R, G, and B is removed,
By providing a detection means that can detect that the filter has been removed, it is possible to prevent the light guide entrance end surface from being burned out due to an excessive amount of illumination light.

[Brief explanation of the drawing]

1 to 14 relate to one embodiment, in which FIG. 1 is a sectional view showing the configuration of the light source section, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. A perspective view showing the storage method, FIG. 4(a) is a block diagram showing the configuration of the endoscope device,
Figure 4(b) is an explanatory diagram showing the configuration of a color mosaic type electronic scope, Figure 5 is an explanatory diagram showing the configuration of a frame sequential type external fiberscope with a camera, and Figure 6 is an explanatory diagram showing the configuration of a mosaic type external optical scope. FIG. 7 is an explanatory diagram showing the configuration of a fiberscope with a fiberscope, FIG. 8 is a block diagram showing the configuration of a field sequential process circuit,
Figure 9 is a block diagram showing the configuration of the mosaic process circuit, Figure 10 is a block diagram showing the configuration of the output circuit,
Figure 1 is a perspective view of a filter cassette incorrect insertion prevention device, Figure 12 is an explanatory diagram of a removal prevention device configured to prevent the filter cassette from being removed when the rotary filter is rotating, and Figure 13 is a filter cassette Fig. 14 is an explanatory view of a cover device for a window for illumination light, and Fig. 14 is an explanatory view of a filter cassette provided with 11 ivy blades. 15... Light source device 33... Rotating filter 3
8... Filter cassette 87... Switch 115.
・・Automatic dimming circuit agent Patent attorney Susumu Ito) □□□−→ 100■

Claims (1)

[Scope of Claims] An endoscope light source device comprising a light source that emits white light and a removable filter that sequentially transmits each color light in a field-sequential manner between the light source and a subject, comprising: 1. A light source device for an endoscope, comprising a light amount control means capable of controlling the amount of illumination light emitted from a light source by detecting that a filter is removed from an optical path.