JP2008284304A - Variable spectrum element, and endoscope system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To highly precisely detect the distance between optical substrates by reducing parasitic capacitance components generated between signal lines connected to electrode parts for providing a spectrum of a desired wavelength with favorable precision. <P>SOLUTION: The variable spectrum element is provided with two optical substrates 3a and 3b at an interval from each other, each having a reflection film 2 on mutually facing surfaces, an actuator to vary the interval between the optical substrates 3a and 3b, and an electrostatic capacity sensor 6 comprising the electrode parts 6a and 6b to detect the interval between the optical substrates 3a and 3b respectively disposed on the mutually facing surfaces. A connection position for the signal line 7 to be connected to the electrode part 6a on one optical substrate 3a is circumferentially deflected from a connection position for the signal line 7 to be connected to the electrode part 6b on the other optical substrate 3b around the optical axes of the optical substrates 3a and 3b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a variable spectroscopic element and an endoscope apparatus.

There is known an etalon-type variable spectroscopic element in which two optical substrates each having an optical coating layer provided on the opposite surface are opposed to each other and the distance between them is variable (see, for example, Patent Document 1).
This variable spectroscopic element is provided with a sensor electrode of a capacitance sensor on the opposing surface of two optical substrates, and the interval between the optical substrates is detected by the capacitance sensor, and the interval is controlled while maintaining parallelism. Can be done.

JP-A-1-94312

  However, when a capacitance sensor is used, not only the capacitance between the electrodes but also the parasitic capacitance generated between the signal lines is detected at the same time. When the parasitic capacitance increases, there is a problem that the resolution becomes relatively small and the resolution is lowered. In particular, as the distance between the optical substrates increases, the absolute value of the detection signal decreases, but the parasitic capacitance generated between the signal lines does not change much, so the detection signal is buried in the noise associated with the parasitic capacitance. There is an inconvenience.

  The present invention has been made in view of the above-described circumstances, and reduces the parasitic capacitance component generated between the signal lines connected to the electrode portion, detects the distance between the optical substrates with high accuracy, and has a desired wavelength. An object of the present invention is to provide a variable spectroscopic element and an endoscope apparatus that can disperse light with high accuracy.

In order to achieve the above object, the present invention provides the following means.
The present invention includes two optical substrates having a reflective film on the opposing surface and facing each other with an interval, an actuator for changing the interval between the optical substrates, and the interval between the optical substrates disposed on the opposing surface, respectively. A capacitance sensor having an electrode portion for detecting the signal line, a connection position of a signal line connected to the electrode portion of one of the optical substrates, and a signal line connected to the electrode portion of the other optical substrate The variable spectroscopic element is shifted in the circumferential direction around the optical axis of the optical substrate.

In the said invention, the said electrode part is good also as arrange | positioning at three or more places at intervals in the circumferential direction around the said optical axis.
Further, in the above invention, the one optical substrate is provided with a separation portion disposed at a position away from the other optical substrate in the optical axis direction than the facing surface of the one optical substrate, The connection position of the signal line may be provided in the separation portion.

  In the above invention, the separation portion may be provided on an outer peripheral portion of the facing surface, and may be an inclined surface that gradually moves away from the other optical substrate in the optical axis direction outward in the radial direction.

  In the present invention, any one of the variable spectroscopic elements described above is provided at the distal end of an elongated insertion portion to be inserted into a body cavity, and all the signal lines connected to the electrode portions of the variable spectroscopic elements are connected to the electrode portions. An endoscope apparatus is provided that is wired along the longitudinal direction of the insertion portion with a relative interval equal to or greater than the minimum interval of the connection positions.

In the above invention, the signal lines may be wired along the longitudinal direction of the insertion portion while maintaining a substantially equal relative distance from each other.
Further, in the above invention, an amplifier circuit for amplifying a signal transmitted by the signal line is provided in the insertion portion, and all the signal lines are between the electrode portion and the amplifier circuit. It is good also as wiring along the longitudinal direction of the said insertion part leaving the relative space | interval more than the space | interval of the connection position to.

  According to the present invention, it is possible to reduce the parasitic capacitance component generated between the signal lines connected to the electrode portion, detect the distance between the optical substrates with high accuracy, and to spectroscopically analyze light having a desired wavelength. There is an effect.

Hereinafter, a variable spectral element 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the variable spectroscopic element 1 according to the present embodiment has, for example, two disc-like shapes that are arranged with a parallel interval and are provided with a reflective film (optical coat layer) 2 on an opposing surface. It is an etalon-type optical filter including optical substrates 3a and 3b and an actuator 3c that changes the distance between the optical substrates 3a and 3b. The optical substrate 3a is directly fixed to the frame member 4, and the optical substrate 3b is attached to the frame member 4 via an actuator 3c.

  Of the two optical substrates 3a and 3b, one optical substrate 3b has a tapered inclined surface (separating portion) 5 formed on the entire outer periphery of the surface facing the other optical substrate 3a. Is provided. The inclined surface 5 is inclined in a direction in which the distance between the two optical substrates 3a and 3b is gradually increased outward in the radial direction.

The actuator 3c is a laminated piezoelectric element, and is provided at four locations at equal intervals in the circumferential direction along the periphery of the optical substrate 3b.
In the variable spectroscopic element 1, the distance between the optical substrates 3a and 3b is changed by the operation of the actuator 3c, whereby the wavelength band of light passing in the optical axis direction can be changed.

  The two optical substrates 3a and 3b are provided with a sensor 6 for detecting the distance between the optical substrates 3a and 3b. The sensor 6 is of the electrostatic capacity type and is provided on the outer peripheral portion outside the optical effective diameter B (see FIG. 2) of the optical substrates 3a and 3b, and has four pairs of sensor electrodes 6a and 6b. Yes.

  As shown in FIG. 2, the sensor electrodes 6a and 6b are arranged at equal intervals along the circumferential direction on the outer peripheral portion of the optical substrate 3a, and are arranged so as to face each other. Each sensor electrode 6a, 6b is provided with wiring patterns 6c, 6d connected to the sensor electrodes 6a, 6b and wiring pads (connection patterns) 6e, 6f connected to the wiring patterns 6c, 6d. Yes. The sensor electrodes 6a and 6b, the wiring patterns 6c and 6d, and the wiring pads 6e and 6f are integrally coated by vapor-depositing a material such as aluminum on the surfaces of the optical substrates 3a and 3b.

  In the present embodiment, the wiring pattern 6d and the wiring pad 6f are provided on the inclined surface 5, respectively. The wiring pads 6e and 6f are disposed radially outward from the wiring patterns 6c and 6d. Accordingly, the wiring pads 6e and 6f are arranged at positions sufficiently separated in the interval direction of the optical substrates 3a and 3b.

The wiring pads 6e and 6f have a sufficiently large area compared to the wiring patterns 6c and 6d in order to connect the wiring 7 by, for example, welding. Further, the wiring pattern 6c (6d) is sufficiently thin so as not to form a large capacitance between the wiring pattern 6d (6c) and the wiring pattern 6c (6d), and does not become a resistance for signal transmission from the sensor electrodes 6a and 6b. It is formed in the thickness.
Furthermore, in this embodiment, the connection position of the wiring 7 in the wiring pads 6e and 6f provided on the two optical substrates 3a and 3b is set to a position shifted by an angle α in the circumferential direction around the optical axis. .

The etalon-type variable spectroscopic element 1 can obtain a high transmittance when the reflective film is parallel, but the transmittance is drastically lowered if there is an error in adjusting the parallelism. Therefore, the variable spectral element 1 used in the imaging unit 2 includes a plurality of sensors 6 and a plurality of actuators 3c in order to adjust the tilt error of the two optical substrates 3a and 3b when the interval is changed. It is desirable to have.
By performing feedback control of the drive signal to the actuator 3c based on the signals from the sensor electrodes 6a and 6b, it is possible to improve accuracy in controlling the transmittance characteristics.
If a high transmittance is obtained by adopting the above-described configuration, it is particularly large when the amount of return light is small, for example, in the case of living body observation (reflection light observation, particularly fluorescence observation) where the return light amount is often small. Expected to be effective.

The operation of the variable spectroscopic element 1 according to this embodiment configured as described above will be described below.
According to the variable spectroscopic element 1 according to the present embodiment, the distance between the optical substrates 3a and 3b is reduced by making light incident on the region of the optical effective diameter B of the two optical substrates 3a and 3b spaced apart from each other. Only light having a wavelength determined accordingly passes through the two optical substrates 3a and 3b, and the remaining light is reflected. Then, by changing the distance between the two optical substrates 3a and 3b by the operation of the actuator 3c, the wavelength of the light transmitted through the two optical substrates 3a and 3b is changed. Light can be split from light in other wavelength bands.

  Since the sensor electrodes 6a and 6b are arranged opposite to each other on the opposing surfaces of the optical substrates 3a and 3b, a voltage signal indicating the capacitance formed between the sensor electrodes 6a and 6b is detected, and the voltage signal is Accordingly, the distance between the sensor electrodes 6a and 6b can be detected. Since four pairs of sensor electrodes 6a and 6b are provided at intervals in the circumferential direction of the optical substrates 3a and 3b, the distance between the optical substrates 3a and 3b at the corresponding positions for each pair of sensor electrodes 6a and 6b. By controlling the actuator 3c based on the detected distance dimension, the distance dimension can be accurately adjusted while maintaining the two optical substrates 3a and 3b in a parallel state.

In this case, in the variable spectral element 1 according to the present embodiment, a tapered inclined surface 5 is provided on the outer peripheral portion of one optical substrate 3b, and a wiring pattern 6d and a wiring pad 6f are formed on the inclined surface 5. Therefore, the positions of the wiring pads 6e and 6f on the two optical substrates are sufficiently spaced from each other, and the capacitance formed between the opposing wiring pads 6e and 6f can be sufficiently suppressed. Furthermore, since the connection position of the wiring 7 in the wiring pads 6e and 6f provided on the two optical substrates 3a and 3b is set at a position shifted by the angle α in the circumferential direction around the optical axis, the wiring 7 is extremely It is also possible to prevent it from approaching.
The wiring patterns 6c and 6d also have portions close to each other, but the width dimension is formed sufficiently small, so that the capacitance formed in the same manner can be suppressed.

  Further, by providing the wiring pattern 6c and the wiring pad 6e on the inclined surface 5 adjacent to the facing surface of one optical substrate 3b, the sensor electrode 6b, the wiring pattern 6d, and the wiring pad 6f are formed by aluminum vapor deposition from one direction. It can be manufactured integrally in a single manufacturing process. In this case, the sensor electrode 6b, the wiring pattern 6d, and the wiring pad 6f formed on the opposing surface and the inclined surface 5 that changes gently from the opposing surface are formed as a coating having a stable thickness. As a result, the signal from the sensor electrode 6b can be correctly taken out without causing disconnection or an increase in electrical resistance.

  Further, according to the variable spectroscopic element 1 according to the present embodiment, the wiring pads 6e and 6f for connecting the wiring 7 are arranged at the outermost peripheral position of the inclined surface 5 of the optical substrates 3a and 3b, and therefore the optical substrate 3a. , 3b can be sufficiently close to each other, the spacing between the wiring pads 6e, 6f can be sufficiently widened, and the interference and proximity between the wirings 7 connected to the wiring pads 6e, 6f can be ensured. Can be prevented.

In particular, since the inclined surface 5 is formed on the entire circumference of the optical substrate 3b, the wiring 7 and the optical substrates 3a and 3b interfere even if the optical substrates 3a and 3b are moved relative to each other in the circumferential direction. Nor. As a result, even when the phase of the optical substrates 3a and 3b is adjusted so that the sensor electrodes 6a and 6b are arranged at positions facing each other during assembly, the optical substrates 3a and 3b and the other wirings 7 It is possible to prevent the wiring 7 from being damaged due to the interference.
Further, like the variable spectroscopic element 1 according to the present embodiment, it can be easily manufactured by keeping one optical substrate flat. The optical substrates 3a and 3b may be interchanged.

In the variable spectroscopic element 1 according to the present embodiment, the inclined surface 5 is formed in a tapered surface shape having a single inclination angle. Instead, a curved surface shape in which the inclination angle gradually changes. You may employ | adopt the inclined surface 5 which has these.
In the variable spectroscopic element 1 according to the present embodiment, only one of the optical substrates 3b is provided with the inclined surface 5 formed on the outer peripheral portion over the entire circumference. Instead, both optical substrates are provided. 3a and 3b may have the inclined surface 5 partially or over the entire circumference in the portion where the wiring pads 6e and 6f are formed.

  In addition, the sensor electrodes 6a and 6b are provided at four locations at intervals in the circumferential direction of the optical substrates 3a and 3b. Alternatively, any number of three or more locations may be provided. . By using three or more locations, the planes of the optical substrates 3a and 3b can be defined, and the parallelism between the two optical substrates 3a and 3b can be easily and accurately achieved.

  Further, as shown in FIG. 3, as the sensor electrode 6a provided on one optical substrate 3a, a single sensor electrode 6a having a size and shape opposed to all the sensor electrodes 6b provided on the other optical substrate 3b. It is good also as adopting. Also in this case, if the connection position of the wiring 7 to the sensor electrode 6a is arranged at a position shifted by an angle α with respect to the connection position of the wiring 7 to the sensor electrode 6b on the other optical substrate 3b. Good.

  With this configuration, the optical substrates 3a and 3b can be assembled without worrying about the relative circumferential shift between them, the assembling work can be further facilitated, and the number of wires 7 can be reduced. Thus, generation of crosstalk noise and parasitic capacitance can be prevented.

  Even if the number of sensor electrodes 6a and 6b facing each other is different, the four sensor electrodes 6a provided on the optical substrate 3a are opposed to the sensor electrodes 6b provided on the optical substrate 3b. Is configured. As a result, it is possible to detect the same four voltage signals as the degree of freedom of driving, that is, the number of actuators 3c.

  Therefore, the distance between the two optical substrates 3a and 3b is accurately determined based on the same number of voltage signals as the number of actuators 3c, which indicates a capacitance uniquely corresponding to the distance between the two optical substrates 3a and 3b. There is an effect that the light of a desired wavelength band can be spectroscopically controlled with high accuracy.

  Contrary to the above, the number of sensor electrodes 6 b provided on the optical substrate 3 b that is displaced by driving the actuator 3 c is set to the number of sensor electrodes 6 a provided on the optical substrate 3 a that is directly fixed to the frame member 4. If the number is less than that, the number of wirings 7 that move when the actuator 3c is driven can be reduced, and the generation of noise due to the capacitance change between the wirings 7 can be reduced.

  Further, as shown in FIGS. 4 and 5, sensor electrodes 6b having different sizes and shapes may be employed as the sensor electrodes 6b facing the sensor electrodes 6a. The example shown in FIG. 4 is a case where the sensor electrode 6b having a semicircular arc shape facing the two sensor electrodes 6a at the same time is provided. Further, the example shown in FIG. 5 is a case where the sensor electrodes 6b each have a ¼ arc-shaped sensor electrode 6b facing each sensor electrode 6a.

  Further, the reflective film 2 provided on the opposing surfaces of the optical substrates 3a and 3b is made of a conductive material, and the reflective film 2 itself is also used as sensor electrodes 6a and 6b for forming capacitance. Also good.

Next, an endoscope apparatus 10 according to an embodiment of the present invention will be described with reference to FIGS. 6 and 7.
As shown in FIG. 6, an endoscope apparatus 10 according to the present embodiment includes an insertion section 11 that is inserted into a body cavity of a living body, and an imaging unit (spectral apparatus) 12 that is disposed in the insertion section 11. A light source unit 13 that emits a plurality of types of light, a control unit 14 that controls the imaging unit 12 and the light source unit 13, and a display unit 15 that displays an image acquired by the imaging unit 12.

The insertion portion 11 has an extremely thin outer dimension that can be inserted into a body cavity of a living body, and includes therein the imaging unit 12 and a light guide 16 that propagates light from the light source unit 13 to the tip 11a. Yes.
The light source unit 13 illuminates an observation target in a body cavity and emits illumination light for acquiring reflected light reflected and returned from the observation target, and a light source for controlling the illumination light source 17 And a control circuit 18.

The illumination light source 17 is a combination of a xenon lamp and a bandpass filter (not shown).
As shown in FIG. 7, the imaging unit 12 is arranged at the distal end of the insertion portion 11, and the above-described variable spectroscopic element 1 that selects the wavelength of light incident from the observation target (the simple spectrum shown in FIG. 7). Therefore, only the optical substrates 3a and 3b are shown.) And an imaging optical system 19 including an imaging element and a lens that collects and photographs the light transmitted through the variable spectral element 1.

As shown in FIG. 6, the control unit 14 includes an image sensor driving circuit 20 that drives and controls the image sensor, a variable spectral element control circuit 21 that drives and controls the variable spectral element 1, and an image acquired by the image sensor. A frame memory 22 that stores information and an image processing circuit 23 that processes image information stored in the frame memory 22 and outputs the processed image information to the display unit 15 are provided.
The imaging element driving circuit 20 and the variable spectral element control circuit 21 are connected to the light source control circuit 18 and drive-control the variable spectral element 1 and the imaging element in synchronization with the operation of the illumination light source 17 by the light source control circuit 18. It is like that.

  Specifically, when the variable spectral element control circuit 21 sets the variable spectral element 1 in the first state, the image sensor driving circuit 20 outputs image information output from the image sensor to the first frame memory 22a. It is like that. When the variable spectral element control circuit 21 sets the variable spectral element 1 to the second state, the image sensor driving circuit 20 outputs image information output from the image sensor to the frame memory 22b.

  Further, the image processing circuit 23 receives, for example, the reflected light image information of the green band from the first frame memory 22a and outputs it to the first channel of the display unit 15. The image processing circuit 23 receives the reflected light image information in the red band from the second frame memory 22b and outputs it to the second channel of the display unit 15.

  In the endoscope apparatus 10 according to the present embodiment, as shown in FIG. 7, the wiring 7 connected to the wiring pads 6e and 6f of the optical substrates 3a and 3b is connected to the wiring pads 6e and 6f. Wiring is performed along the longitudinal direction of the insertion portion 11 in a substantially parallel manner while maintaining an interval equal to or greater than the interval between the positions, and is led out to the variable spectroscopic element control circuit 21.

The operation of the endoscope apparatus 10 according to the present embodiment configured as described above will be described below.
In order to image a subject to be imaged in a body cavity of a living body using the endoscope apparatus 10 according to the present embodiment, the insertion unit 11 is inserted into the body cavity, and the distal end 11a is opposed to the object to be imaged in the body cavity. In this state, the light source unit 13 and the control unit 14 are operated, and the light source control circuit 18 is operated to operate the illumination light source 17 to generate illumination light.

Illumination light generated in the light source unit 13 is propagated to the distal end 11a of the insertion portion 11 through the light guide 16, and is irradiated from the distal end 11a of the insertion portion 11 toward the photographing target.
The illumination light is reflected on the surface of the object to be imaged, and the reflected light having a predetermined wavelength that has passed through the variable spectral element 1 is imaged on the imaging surface of the imaging element of the imaging optical system 19 to obtain reflected light image information.

  In this case, in order to acquire a reflected light image in the green band, the wavelength of the reflected light reaching the imaging device is activated by operating the variable spectral element control circuit 21 to switch the variable spectral element 1 to the first state. Limit the bandwidth to 530-560 nm. The reflected light image information acquired in this way is stored in the first frame memory 22a, and is output to the first channel of the display unit 15 and displayed.

When acquiring a red reflected light image, the variable spectral element control circuit 21 is operated to switch the variable spectral element 1 to the second state, so that the wavelength band of the reflected light reaching the imaging element is changed to 630. Limit to ~ 660nm. The reflected light image information acquired in this way is stored in the second frame memory 22b, and is output to the second channel of the display unit 15 and displayed.
Thus, according to the endoscope apparatus 10 according to the present embodiment, image information for different wavelength bands of reflected light can be provided to the user.

  In this case, according to the endoscope apparatus 10 according to the present embodiment, since the sensor 6 is provided in the variable spectral element 1, the sensor 6 is switched when switched between the first state and the second state. Thus, the distance between the two optical substrates 3a and 3b is detected, and the voltage signal applied to the actuator 3c is feedback-controlled. Thereby, the diameter of the distal end 11a of the insertion portion 11 can be reduced, the distance between the optical substrates 3a and 3b is accurately controlled while being small, and light in a desired wavelength band is dispersed with high accuracy. A clear fluorescent image and reflected light image can be obtained.

  Further, in the present embodiment, the inclined surface 5 is provided on the outer peripheral portions of the optical substrates 3a and 3b, and wiring patterns 6c and 6d and wiring pads 6e and 6f connected to the sensor electrodes 6a and 6b are provided on the inclined surface 5, respectively. Since it is provided, the wiring pads 6e and 6f provided on the opposing optical substrates 3a and 3b are sufficiently separated. Further, the connection position of the wiring 7 to the wiring pads 6e and 6f is arranged at a position shifted in the circumferential direction around the optical axis. Therefore, the optical substrates 3a and 3b can be sufficiently close to each other without causing the wires 7 connected to the wiring pads 6e and 6f to interfere with each other.

  Furthermore, in the endoscope apparatus 10 according to the present embodiment, the wiring 7 wired in the insertion portion 11 maintains a substantially parallel distance while maintaining the distance between the connection positions to the wiring pads 6e and 6f. Since it arrange | positions in the longitudinal direction of the insertion part 11, it can prevent that the some wiring 7 adjoins extremely. Thereby, the parasitic capacitance generated between the wirings 7 can be suppressed, and the generation of noise can be suppressed. By preventing the occurrence of noise, the entire dynamic range of the output signal of the sensor 6 can be widely used, and the interval between the optical substrates 3a and 3b can be adjusted precisely, and a desired image can be obtained with high accuracy. can do.

  In addition, by wiring the wirings 7 approximately in parallel with substantially the same relative spacing, the wirings 7 can maintain the same relative spacing to each other, and the parasitic capacitance between the plurality of wirings 7 can be minimized. . In addition, since the distances between the plurality of wirings 7 are maintained to be equal, variations in parasitic capacitances parasitic on the respective wirings 7 are minimized, so that more precise adjustment is expected.

In the endoscope apparatus 10 according to the present embodiment, the variable spectroscopic element 1 may be the one shown in any of FIGS.
Further, as shown in FIG. 8, an amplifier 24 for amplifying signals from the sensor electrodes 6a and 6b is arranged in the insertion portion, and the wiring 7 from the wiring pads 6e and 6f to the amplifier 24 is wired at a substantially parallel interval. You may decide to do it.

As an image pickup device, an arbitrary type such as a C-MOS, a photodiode, an electron multiplying CCD (EMCCD), an electron implantation type CCD (EBCCD) can be adopted.
As the actuator, a magnetostrictive element may be used instead of the piezo element.

Moreover, in the endoscope apparatus 10 according to the present embodiment, the apparatus that acquires the reflected light image has been described, but instead, it may be used for other observation methods such as acquiring a fluorescent image and a reflected light image. it can.
Moreover, in this embodiment, you may apply not only to the flexible mirror which has a bending part but to a rigid mirror. Further, the observation target is not limited to a living body. The present invention can also be applied to an industrial endoscope for the inside of piping, machines, structures, and the like.

  In the present embodiment, the endoscope apparatus 10 including the variable spectral element 1 in the imaging unit 12 has been described. Instead, the variable spectral element 1 is attached to the light source unit disposed at the distal end of the insertion portion 11. It is good also as an endoscope apparatus provided.

It is a longitudinal cross-sectional view which shows the variable spectral element which concerns on one Embodiment of this invention. It is a perspective view which shows a pair of optical board | substrate with which the variable spectroscopy element of FIG. 1 is equipped. It is a perspective view which shows the modification of the optical board | substrate of FIG. It is a figure which shows the form and arrangement | positioning of a sensor electrode in the modification of the variable board | substrate of FIG. It is a figure which shows the form and arrangement | positioning of the sensor electrode in the other modification of the variable board | substrate of FIG. 1 is an overall configuration diagram showing an endoscope apparatus according to an embodiment of the present invention. It is a figure which shows the wiring method to the variable spectroscopy element in the insertion part with which the endoscope apparatus of FIG. 6 is equipped. It is a figure which shows the modification of the wiring method of FIG.

Explanation of symbols

1 Variable Spectroscopic Element 2 Coat Layer (Reflective Film)
3a, 3b Optical substrate 3c Actuator 5 Inclined surface (separating part)
6 Sensor (Capacitance sensor)
6a, 6b Sensor electrode (electrode part)
7 Wiring (signal line)
DESCRIPTION OF SYMBOLS 10 Endoscope apparatus 11 Insertion part 24 Amplification part (amplification circuit)

Claims (7)

Two optical substrates having a reflective film on opposite surfaces and facing each other with a gap between them,
An actuator for changing the distance between the optical substrates;
A capacitance sensor having an electrode part for detecting the interval between the optical substrates respectively disposed on the facing surface;
A connection position of a signal line connected to the electrode portion of one optical substrate and a connection position of a signal line connected to the electrode portion of the other optical substrate are circumferentially around the optical axis of the optical substrate. The variable spectroscopic element which has shifted.   The variable spectroscopic element according to claim 1, wherein the electrode portions are arranged at three or more locations at intervals in the circumferential direction around the optical axis. The one optical substrate is provided with a separation portion arranged at a position away from the other optical substrate in the optical axis direction than the facing surface of the one optical substrate,
The variable spectroscopic element according to claim 1, wherein a connection position of the signal line is provided in the separation portion.   4. The variable spectroscopic element according to claim 3, wherein the separation portion includes an inclined surface that is provided on an outer peripheral portion of the facing surface and gradually moves away from the other optical substrate in the optical axis direction outward in the radial direction. The variable spectroscopic element according to any one of claims 1 to 4 is provided at a distal end of an elongated insertion portion to be inserted into a body cavity,
All the signal lines connected to the electrode part of the variable spectroscopic element are wired along the longitudinal direction of the insertion part with a relative interval equal to or greater than the minimum interval of the connection position to the electrode part. Endoscopic device.   The endoscope apparatus according to claim 5, wherein the signal lines are wired along a longitudinal direction of the insertion portion while maintaining a substantially equal relative distance from each other. An amplification circuit for amplifying a signal transmitted through the signal line is provided in the insertion portion,
The signal lines are all wired along the longitudinal direction of the insertion portion with a relative interval equal to or greater than the minimum interval of the connection position to the electrode portion between the electrode portion and the amplifier circuit. The endoscope apparatus according to Item 5.

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