JP2019032430A - Optical component holder and optical device - Google Patents

Abstract

To provide an optical component holder and an optical device, excellent in maintainability.SOLUTION: An optical component holder comprises a holder body formed with an open hole through which an optical axis of an optical component can pass, and having a holding part positioned around the open hole and holding the optical component. The holder body comprises: a circumferential slit provided over the whole circumference of the open hole, and opened to an inner wall surface of the open hole; and at least one first fluid supply hole opened to a surface of the holder body on an outer peripheral side of the holding part, and communicating with the circumferential slit.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to an optical component holder and an optical device.

For example, in a device such as a coal gasifier or a pulverized coal combustion boiler, a monitoring device is provided to monitor the inside of the furnace. Such a monitoring device is configured to take an image of the inside of the furnace with an imaging device through a transparent window shielded from the atmosphere in the furnace. Since the surface inside the furnace of the transparent window is exposed to an atmosphere containing dust at a high temperature in the furnace, dust or the like may adhere.
Therefore, in such a monitoring device, in order to prevent dust and the like from adhering to the surface inside the furnace of the transparent window, for example, cleaning air is configured to be blown onto the surface inside the furnace of the transparent window. The thing is known (refer patent document 1).
In the monitoring device described in this patent document, since cleaning air is blown onto the surface inside the furnace of the transparent window, it is possible to suppress dust and the like from adhering to the surface inside the furnace of the transparent window.

JP 2002-105464 A

  By the way, in the monitoring apparatus as described above, maintenance such as replacement of the transparent window may be performed. Therefore, in the monitoring apparatus as described above, it is desired that the maintainability is good.

  In view of the above-described circumstances, at least one embodiment of the present invention aims to provide an optical component holder and an optical device that have good maintainability.

(1) An optical component holder according to at least one embodiment of the present invention includes:
A through hole through which the optical axis of the optical component can pass is formed, and a holder body having a holding portion for holding the optical component located around the through hole,
In the holder body,
An all-around slit that is provided over the entire circumference of the through-hole and opens on the inner wall surface of the through-hole;
At least one first fluid supply hole that opens to the surface of the holder body on the outer peripheral side of the holding portion and communicates with the all-round slit;
Is formed.

  According to the configuration of (1) above, the holder main body of the optical component holder is provided over the entire circumference of the through hole and opens to the inner wall surface of the through hole, and the holder on the outer peripheral side of the holding portion. At least one first fluid supply hole that is open to the surface of the main body and communicates with the entire circumferential slit is formed. Thereby, the holding | maintenance function of an optical component and the adhesion prevention function of the dust etc. to an optical component are realizable by the optical component holder of a simple structure. In addition, since it is not necessary to prepare a member for holding the optical component and a member for preventing dust from adhering to the optical component separately, the maintainability of the optical apparatus using the optical component holder can be improved. .

(2) In some embodiments, in the configuration of the above (1), each of the first fluid supply holes has the through hole as it goes to the connection end with the circumferential slit of the first fluid supply hole. It extends within the holder body so as to be displaced in the circumferential direction.

  The fluid that has flowed into the perimeter slit from the connection end with the perimeter slit of the first fluid supply hole flows toward the wall facing the connection end among the walls constituting the perimeter slit and collides with the wall surface. . Here, according to the configuration of the above (2), each of the first fluid supply holes is displaced in the circumferential direction of the through hole toward the connection end with the entire circumferential slit of the first fluid supply hole. Since it extends in the inside, the distance from the said connection end to the said wall surface where a fluid collides can be lengthened. Thereby, since the diffusion of the fluid that has flowed into the all-around slit from the first fluid supply hole in the all-around slit is promoted, the bias of the fluid blown out from the all-around slit is suppressed.

(3) In some embodiments, in the configuration of (1) or (2), the all-around slit extends beyond the communication position between the all-around slit and each of the first fluid supply holes. It extends in the holder main body.

  According to the configuration of (3) above, since the perimeter slit extends in the holder main body beyond the communication position between the perimeter slit and each of the first fluid supply holes, A volume on the opposite side of the slit from the opening of the inner wall surface of the through hole can be secured. Thereby, since the diffusion of the fluid that has flowed into the all-around slit from the first fluid supply hole in the all-around slit is promoted, the bias of the fluid blown out from the all-around slit is suppressed.

(4) In some embodiments, in any one of the above configurations (1) to (3),
The at least one first fluid supply hole includes a plurality of first fluid supply holes arranged along the circumferential direction of the through hole on the outer peripheral side of the holding portion,
The holder body has a first circumferential groove provided along the circumferential direction on the surface of the holder body,
The plurality of first fluid supply holes may be opened at a bottom surface of the first circumferential groove.

  According to the configuration of (4) above, the plurality of first fluid supply holes are opened at the bottom surface of the first circumferential groove provided in the circumferential direction on the surface of the holder body. As a result, for example, when the optical component holder having the configuration (4) is used in an optical device, the first circumference even if the position of the first fluid supply hole and the fluid supply position from the optical device side are slightly shifted. A fluid is supplied to the first fluid supply hole through the directional groove. Therefore, the position of the first fluid supply hole does not have to be strictly matched with the position of supplying the fluid from the optical device side, so that the optical component holder can be easily manufactured and the manufacturing cost can be suppressed.

(5) In some embodiments, in any one of the above configurations (1) to (4), the through hole has a tapered shape whose inner diameter increases as the distance from the holding portion increases in the optical axis direction. Features.

  According to the configuration of (5) above, since the through hole has a tapered shape in which the inner diameter increases as it moves away from the holding part in the optical axis direction, the light beam passing through the optical component held on the holding part side is the inner wall surface of the through hole. It becomes difficult to be blocked by.

(6) In some embodiments, in any one of the configurations (1) to (5), the all-around slit is directed to the inner side in the radial direction as it approaches the holding portion in the optical axis direction. It is characterized by extending in the body.

  According to the configuration of (6) above, since the entire circumferential slit extends in the holder main body so as to go radially inward as it approaches the holding portion in the optical axis direction, the optical component held on the holding portion side The fluid can be efficiently sprayed on the surface.

(7) In some embodiments, in any one of the configurations (1) to (6) above,
Each of the first fluid supply holes is
One end opening in the end face of the holder body provided with the holding portion;
Of the pair of slit inner wall surfaces facing each other inside the holder main body so as to form the entire circumferential slit, the other end opened to the first slit inner wall surface located on the end surface side,
It is characterized by including.

  According to the configuration of (7), one end of each of the first fluid supply holes is open to the end surface of the holder body provided with the holding portion. Thereby, for example, when the optical component holder having the configuration (7) is used in an optical device, it becomes easy to supply fluid from the optical device side to the first fluid supply hole.

(8) In some embodiments, in any one of the above configurations (1) to (7),
The holding part includes a holding surface orthogonal to the central axis of the through hole,
Of the pair of slit inner wall surfaces facing each other inside the holder main body so as to form the entire circumferential slit, the first slit inner wall surface located on the holding surface side is the holding edge at the inner peripheral edge of the holding surface. It is characterized by intersecting the surface.

  According to the configuration of (8) above, of the pair of slit inner wall surfaces, the first slit inner wall surface located on the holding surface side intersects the holding surface at the inner peripheral edge of the holding surface. As a result, the circumferential slit can be brought close to the holding surface, so that the fluid blown out from the circumferential slit is sprayed without stagnation even in the vicinity of the inner wall surface of the through hole in the surface of the optical component held by the holding surface. It becomes like this.

(9) In some embodiments, in any one of the configurations (1) to (8), the holder main body has a male screw portion formed on an outer peripheral surface of the holder main body.

  According to the configuration of (9) above, since the external thread portion is formed on the outer peripheral surface of the holder main body, the optical component holder can be easily attached to the counterpart member.

(10) In some embodiments, in the configuration of (9) above,
Each of the first fluid supply holes is open to the surface of the holder body on the inner peripheral side of the male screw portion and on the outer peripheral side of the holding portion.

  According to the configuration of (10) above, each of the first fluid supply holes opens on the surface of the holder main body on the inner peripheral side of the male screw portion and on the outer peripheral side of the holding portion. Thereby, for example, when the optical component holder having the configuration (10) is used in an optical device, it becomes easy to supply fluid from the optical device side to the first fluid supply hole.

(11) An optical device according to at least one embodiment of the present invention includes:
A housing,
An optical component incorporated in the housing;
The optical component holder according to any one of (1) to (10), configured to hold the optical component in the housing;
It is characterized by providing.

According to the configuration of (11) above, since the optical device includes the optical component holder of any one of (1) to (10), the function of holding the optical component and the function of preventing adhesion of dust or the like to the optical component, Can be realized by an optical component holder having a simple configuration. In addition, since the member for holding the optical component and the member for preventing dust from adhering to the optical component need not be prepared separately, the maintainability of the optical device can be improved.
Further, according to the configuration of (11) above, the fluid that has flowed from the first fluid supply hole into the all-round slit is supplied to the first fluid supply hole through the opening on the surface of the holder body. It is sprayed onto the optical component held by the holding portion while diffusing in the slit. Thereby, a fluid can be sprayed from the perimeter of a through-hole with respect to the surface of the optical component which faced the through-hole. Therefore, since the bias of the fluid sprayed onto the optical component can be suppressed, the effect of preventing adhesion of dust or the like to the optical component can be improved.

(12) In some embodiments, in the configuration of the above (11), the at least one first fluid supply hole of the optical component holder communicates with a fluid flow path provided inside the housing. It is characterized by being.

  According to the configuration of (12) above, since at least one first fluid supply hole of the optical component holder communicates with the fluid flow path provided in the housing, fluid can be passed from the housing to the optical component holder. A supply path can be secured.

(13) In some embodiments, in the configuration of (12) above,
The at least one first fluid supply hole is provided inside the holder body, and includes a plurality of first fluid supply holes arranged along the circumferential direction of the through hole on the outer peripheral side of the holding portion,
The fluid flow path includes a plurality of second fluid supply holes provided in the housing and arranged along the circumferential direction,
At least one circumferential groove for communicating the plurality of first fluid supply holes and the plurality of second fluid supply holes is formed in at least one of the holder body or the housing.

  According to the configuration of (13) above, at least one circumferential groove for communicating the plurality of first fluid supply holes and the plurality of second fluid supply holes is formed in at least one of the holder body or the housing. Therefore, even if the position of the first fluid supply hole and the position of the second fluid supply hole are somewhat shifted, the fluid from the second fluid supply hole can be supplied to the first fluid supply hole via the circumferential groove. Therefore, the position of the first fluid supply hole and the position of the second fluid supply hole do not have to be strictly matched, so that the optical device can be easily manufactured and the manufacturing cost can be suppressed.

(14) In some embodiments, in the configuration of (13) above,
The at least one circumferential groove is
A first circumferential groove provided along the circumferential direction on the surface of the holder body;
Or
It includes at least one of second circumferential grooves provided along the circumferential direction on the surface of the casing facing the holder body.

  According to the configuration of (14) above, the at least one circumferential groove is a first circumferential groove provided in the circumferential direction on the surface of the holder body, or a circumferential direction on the surface of the housing facing the holder body. At least one of the second circumferential grooves provided along. Thereby, even if the position of the first fluid supply hole and the position of the second fluid supply hole are slightly deviated, the fluid from the second fluid supply hole passes through the first circumferential groove or the second circumferential groove. One fluid supply hole can be supplied. Therefore, the position of the first fluid supply hole and the position of the second fluid supply hole do not have to be strictly matched, so that the optical device can be easily manufactured and the manufacturing cost can be suppressed.

(15) In some embodiments, in the configuration of (14) above,
The at least one circumferential groove includes the second circumferential groove;
The holder body has a tapered surface formed on the outer peripheral side of the holding portion so as to be displaced from the holding portion in the optical axis direction as it goes radially outward.
The taper surface faces the second circumferential groove.

  According to the configuration of (15), the tapered surface is formed on the outer peripheral side of the holding portion so as to deviate from the holding portion in the optical axis direction toward the radially outer side, and this tapered surface is the second circumferential groove. Facing. Thereby, it becomes easy to ensure the volume of the space formed by the second circumferential groove and the tapered surface.

  According to at least one embodiment of the present invention, it is possible to provide an optical component holder and an optical device that have good maintainability.

It is a block diagram which shows the principal part of the coal gasification apparatus in which the imaging device in a furnace is used as an example of the optical apparatus which concerns on some embodiment. It is typical sectional drawing of the imaging device in a furnace which concerns on some embodiment. It is a figure which shows the external appearance of the optical component holder which concerns on one embodiment among the optical component holders which concern on some embodiment, (a) is a perspective view of the whole optical component holder which concerns on one embodiment, FIG. 5B is a perspective view showing a cross section of the optical component holder according to the embodiment cut along the optical axis AX. It is a perspective view of a section when the optical component holder concerning one embodiment is seen from a different angle from Drawing 3 (b). It is the figure which looked at the optical component holder which concerns on other embodiment among the optical component holders which concern on some embodiment from the furnace outer side. It is a perspective view which shows the cross section which cut | disconnected diagonally the optical component holder which concerns on other embodiment along the direction which cross | intersects an optical axis. It is a figure which shows the external appearance of the optical component holder which concerns on other embodiment among the optical component holders which concern on some embodiment, (a) saw the optical component holder which concerns on other embodiment from the furnace outer side. It is an external appearance perspective view, (b) is a perspective view which shows the cross section which cut | disconnected the optical component holder which concerns on other embodiment along an optical axis. It is typical sectional drawing of the imaging device in a furnace using the optical component holder which concerns on other embodiment shown in FIG. It is a figure explaining the flow of air. It is a figure explaining the flow of air. It is typical sectional drawing of the in-furnace imaging device which concerns on a modification.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.

FIG. 1 is a configuration diagram illustrating a main part of a coal gasifier in which an in-furnace imaging apparatus is used as an example of an optical apparatus according to some embodiments.
The gasification furnace 200 includes a combustor unit 201 and a reductor unit 202. The combustor unit 201 constitutes a combustion stage that melts pulverized coal and char and generates high-temperature gas. The reductor unit 202 constitutes a gasification stage for heating and thermally decomposing pulverized coal ejected from a reductor burner 205 described later with the high-temperature gas generated in the combustor unit 201.
The combustor unit 201 includes a combustor burner 203 that jets the pulverized coal transported by a transport gas such as nitrogen from the pulverized coal supply device 207 into the combustor unit 201 together with the gasifying agent from the gasifying agent supply pipe 206, and a gas A char burner 204 for ejecting the separated char into the combustor unit 201 is provided. In addition, the reductor unit 202 is provided with a reductor burner 205 that ejects the pulverized coal transported by the transport gas from the pulverized coal supply device 207 into the reductor unit 202.

  The carrier gas pipe 215 conveys the pulverized coal from the pulverized coal supply device 207 to the combustor burner 203 and the reductor burner 205 by the carrier gas in the carrier gas pipe 215 and also conveys the char after the product gas separation to the char burner 204. It is a gas pipe for. The generated gas pipe 211 is a gas pipe for conveying the pyrolysis gas generated in the reductor unit 202. The cyclone 212 is a separation device that separates char from the pyrolysis gas sent through the product gas pipe 211. The char separated by the cyclone 212 is supplied to the combustor unit 201 via the char supply pipe 214 and the char burner 204 by the char supply device 213. The lower combustor 241 is a combustor for light oil combustion when the gasification furnace 200 is started.

  In the coal gasifier according to some embodiments, in the combustor unit 201, pulverized coal transported by the transport gas from the combustor burner 203 is ejected, and char is supplied from the char burner 204 as described above. High temperature and high load combustion is performed by the gasifying agent. A high-temperature gas of about 2000 ° C. generated by the combustion is sent to the upper reductor unit 202. On the other hand, the ash content in the coal is melted by high-temperature combustion in the combustor unit 201 to form molten slag, which naturally falls from the slag hole below the lower combustor 241 and is discharged out of the system.

  In the reductor unit 202, the pulverized coal transported by the transport gas as described above is ejected from the reductor burner 205, and is thermally decomposed by the high-temperature gas from the combustor unit 201 to be gasified. The product gas generated by the gasification action is sent out from the reductor unit 202, enters the cyclone 212 through the product gas pipe 211, and is separated into char as described above, and then sent to a use destination such as a gas turbine. It is done.

  In the coal gasifier according to some embodiments, an in-furnace imaging device 100 for monitoring the combustion state in the furnace, such as the state of fluid slag in the gasification furnace 200, is attached to the furnace wall. Yes. An image processing apparatus 221 is connected to the in-furnace imaging apparatus 100, and data of an in-furnace image obtained by imaging with the in-furnace imaging apparatus 100 is output to the image processing apparatus 221.

(In-furnace imaging device 100)
FIG. 2 is a schematic cross-sectional view of the in-furnace imaging apparatus 100 according to some embodiments. The in-furnace imaging apparatus 100 includes a casing 110, an imaging unit 101, a transparent window 102, and an optical component holder 130.
The in-furnace imaging apparatus 100 according to some embodiments shields the inside of the casing 110 provided with the imaging unit 101 and the inside of the gasification furnace 200 by the transparent window 102, and passes the gas through the transparent window 102 by the imaging unit 101. The inside of the chemical conversion furnace 102 is imaged.

  The casing 110 is a member having a cylindrical shape, and includes a cylindrical portion 111 having a cylindrical shape and a tip wall portion 112 in the vicinity of the left end portion of the cylindrical portion 111 in the drawing. An imaging unit 101 is disposed inside the cylindrical unit 111. The imaging unit 101 includes an imaging element (not illustrated) that captures a subject image and an imaging optical system (not illustrated) that guides subject light to the imaging element.

  The front wall 112 has an opening 113 for allowing a light beam incident on the imaging unit 101 through the transparent window 102, which is an optical component, and a plurality of housings provided around the opening 113 along the circumferential direction. A fluid supply hole 114 is formed. In some embodiments, the casing-side fluid supply hole 114 extends along the axial direction of the cylindrical portion 111, that is, along the optical axis AX of the light beam incident on the imaging unit 101 through the transparent window 102. ing. In FIG. 2, the left side in the figure is the inside of the furnace, and the right side in the figure is the outside of the furnace. An end portion inside the furnace of the case 110 is disposed in the lower combustor 241 of the gasification furnace 200.

A transparent window attaching portion 115 to which the transparent window 102 is attached is provided inside the furnace wall of the tip wall portion 112. The transparent window attaching portion 115 holds the transparent window 102 in contact with the vicinity of the outer edge of the outer end face of the transparent window 102 described later.
Each of the plurality of housing-side fluid supply holes 114 is a through-hole that penetrates the tip wall portion 112 and communicates with a space inside the housing 110 that has a cylindrical shape.
A holder attaching portion 116 to which the optical component holder 130 is attached is provided on the inner side of the furnace than the front end wall portion 112 in the housing 110. The holder attachment portion 116 has a female screw portion 116a formed on the inner peripheral surface of the cylinder.

  A fluid flow path 118 is provided between the inner peripheral surface of the cylindrical portion 111 and the imaging unit 101. A fluid for cooling the imaging unit 101, specifically, for example, air supplied from the outside flows through the fluid flow path 118.

FIG. 3 is a diagram illustrating an appearance of an optical component holder 130A according to one embodiment among the optical component holders 130 according to some embodiments, and FIG. 3A is an optical component holder according to the embodiment. FIG. 3B is a perspective view showing a cross section of the optical component holder 130A according to the embodiment cut along the optical axis AX.
FIG. 4 is a perspective view of a cross section when the optical component holder 130A according to the embodiment is viewed from an angle different from that in FIG.
FIG. 5 is a view of an optical component holder 130B according to another embodiment of the optical component holders 130 according to some embodiments as viewed from the outside of the furnace.
FIG. 6 is a perspective view showing a cross section obtained by obliquely cutting an optical component holder 130B according to another embodiment along a direction intersecting the optical axis AX.
FIG. 7 is a diagram illustrating an appearance of an optical component holder 130C according to another embodiment among the optical component holders 130 according to some embodiments, and FIG. 7A relates to the other embodiments. FIG. 7B is an external perspective view of the optical component holder 130C as viewed from the outside of the furnace, and FIG. 7B is a perspective view showing a cross section of the optical component holder 130C according to another embodiment cut along the optical axis AX.
FIG. 8 is a schematic cross-sectional view of the in-furnace imaging apparatus 100 using the optical component holder 130 </ b> C according to still another embodiment shown in FIG. 7.

As shown in FIGS. 3 to 7, the optical component holder 130 according to some embodiments includes a holder main body 131. The holder body 131 is formed with a through hole 132 through which the optical axis of the transparent window 102 as an optical component can pass.
The holder main body 131 of some embodiments shown in FIGS. 3 to 7 has a holding portion 133 that is positioned around the through hole 132 and holds the transparent window 102. The holding part 133 includes a holding surface 133a that is orthogonal to the central axis of the through-hole 132, that is, orthogonal to the optical axis AX.

The holder main body 131 of some embodiments shown in FIGS. 3 to 7 is provided over the entire circumference of the through hole 132 and opens to the inner wall surface 132a of the through hole 132, and the holding portion. A plurality of first fluid supply holes 150 that open to the surface of the holder main body 131 on the outer peripheral side of 133 and communicate with the entire circumferential slit 140 are formed.
The holder main body 131 according to some embodiments shown in FIGS. 3 to 7 has a male screw portion 134 formed on the outer peripheral surface of the holder main body 131.

  In the optical component holder 130 according to some embodiments shown in FIG. 3 to FIG. 7, the through hole 132 has a tapered shape in which the inner diameter increases with increasing distance from the holding portion 133 in the optical axis AX direction, that is, toward the furnace inner side. Have

In the optical component holder 130 according to some embodiments shown in FIG. 3 to FIG. 7, the all-around slit 140 is directed radially inward as it approaches the holding unit 133 in the optical axis AX direction, that is, toward the furnace outer side. As shown in FIG.
In the optical component holder 130 according to some embodiments shown in FIGS. 3 to 7, among the pair of slit inner wall surfaces 141 and 142 facing each other inside the holder main body 131 so as to form the entire circumference slit 140, The first slit inner wall surface 141 located on the holding surface 133a side intersects the holding surface 133a at the inner peripheral edge of the holding surface 133a.
In the optical component holder 130 according to some embodiments shown in FIGS. 3 to 7, the perimeter slit 140 extends beyond the communication position between the perimeter slit 140 and each of the first fluid supply holes 150. It extends in the holder main body 131.

In the optical component holder 130 according to some embodiments shown in FIGS. 3 to 7, a plurality of first fluid supply holes 150 are arranged along the circumferential direction of the through hole 132 on the outer peripheral side of the holding portion 133. .
In the optical component holder 130 </ b> A according to the embodiment shown in FIGS. 3 and 4, each of the first fluid supply holes 150 extends along the optical axis AX in the holder main body 131.
In the optical component holder 130B according to another embodiment shown in FIGS. 5 and 6 and the optical component holder 130C according to still another embodiment shown in FIGS. 7A and 7B, the first fluid supply hole 150 is provided. Each extends in the holder main body 131 so as to be displaced in the circumferential direction of the through-hole 132 toward the connection end of the first fluid supply hole 150 with the entire circumferential slit 140.

In the optical component holder 130 according to some embodiments shown in FIGS. 3 to 7, each of the first fluid supply holes 150 includes one end 151 that opens to the end surface of the holder main body 131 provided with the holding portion 133, and Of the pair of slit inner wall surfaces 141 and 142, the other end 152 opened to the first slit inner wall surface 141 located on the end surface side is included.
In the optical component holder 130 according to some embodiments shown in FIGS. 3 to 7, each of the first fluid supply holes 150 has a holder main body on the inner peripheral side of the male screw portion 134 and on the outer peripheral side of the holding portion 133. The surface of 131 is opened.

  As shown in FIGS. 3 to 6, in the optical component holder 130 </ b> A and the optical component holder 130 </ b> B according to some embodiments, the holder main body 131 is provided on the surface of the holder main body 131 along the circumferential direction. A groove 135 is provided. In the optical component holder 130 </ b> A and the optical component holder 130 </ b> B according to some embodiments, the first fluid supply hole 150 opens at the bottom surface of the first circumferential groove 135.

As shown in FIGS. 2 and 8, the optical component holder 130 according to some embodiments described above is fixed to the housing 110 by the male screw portion 134 being screwed into the female screw portion 116 a of the housing 110. At the same time, the holding surface 133a of the holding unit 133 is in contact with the vicinity of the outer edge of the inner end face of the transparent window 102 to hold the transparent window 102. When the optical component holder 130 according to some embodiments is fixed to the housing 110, the first fluid supply hole 150 communicates with the fluid flow path 118 provided inside the housing 110.
Specifically, the fluid flow path 118 is provided inside the casing 110 and includes a plurality of casing-side fluid supply holes 114 arranged in the circumferential direction as described above. In the following description, the housing side fluid supply hole 114 is also referred to as a second fluid supply hole 114.
As shown in FIG. 2, in some embodiments, a first circumferential groove 135 provided in the holder body 131 allows the first fluid supply hole 150 and the second fluid supply hole 114 to communicate with each other.

  As shown in FIG. 8, in some embodiments, the casing 110 is provided on the surface (inner peripheral surface) of the casing 110 along the circumferential direction inside the furnace than the tip wall portion 112. A second circumferential groove 119 is formed, and the second circumferential groove 119 communicates the first fluid supply hole 150 and the second fluid supply hole 114.

  As shown in FIG. 8, in some embodiments, the holder main body 131 is a taper formed on the outer peripheral side of the holding portion 133 so as to be displaced from the holding portion 133 in the optical axis direction as going outward in the radial direction. It has a surface 136. The tapered surface 136 faces the second circumferential groove 119.

  In the in-furnace imaging apparatus 100 according to some embodiments configured as described above, the casing 110 in which the imaging unit 101 that captures the light image incident through the transparent window 102 disposed at the tip inside the furnace is disposed. The imaging unit 101 is cooled by circulating cooling air from the outside of the furnace. In addition, the in-furnace imaging apparatus 100 according to some embodiments is configured to blow cooling air for the imaging unit 101 onto the inner surface of the transparent window 102. Hereinafter, the flow of air in the in-furnace imaging apparatus 100 will be described with reference to FIGS. 9 and 10. FIG. 9 is the same diagram as FIG. 2, but some reference numerals are omitted for convenience of explanation. FIG. 10 is a diagram similar to FIG. 8, but some reference numerals are omitted for convenience of explanation.

In the in-furnace imaging apparatus 100 according to some embodiments, the cooling air is, for example, the fluid flow path 118 of the casing 110 illustrated in FIGS. 9 and 10 from the right outer furnace to the left inner furnace. It flows toward.
In some embodiments, as shown in FIG. 9, the air that has flowed through the fluid flow path 118 passes through the plurality of housing-side fluid supply holes 114 (second fluid supply holes 114) and the first circumferential groove 135. Flow into. In some embodiments, as shown in FIG. 10, the air flowing through the fluid flow path 118 passes through the plurality of housing-side fluid supply holes 114 (second fluid supply holes 114) in the second circumferential direction. It flows into the groove 119.
In some embodiments, as shown in FIG. 9, the air that has flowed into the first circumferential groove 135 flows into the plurality of first fluid supply holes 150. In some embodiments, as shown in FIG. 10, the air that has flowed into the second circumferential groove 119 flows into the plurality of first fluid supply holes 150.

Thus, in some embodiments, air from the plurality of housing-side fluid supply holes 114 (second fluid supply holes 114) once flows into the first circumferential groove 135 or the second circumferential groove 119. Then, it is configured to flow into the plurality of first fluid supply holes 150. The reason is as follows.
That is, in some embodiments, the optical component holder 130 is attached to the housing 110 by screwing the male screw portion 134 of the holder main body 131 into the female screw portion 116 a of the holder attaching portion 116. Therefore, when viewed along the optical axis AX direction, the position of the one end 151 that is the opening outside the furnace of the first fluid supply hole 150 and the position of the opening inside the furnace of the casing-side fluid supply hole 114 do not necessarily coincide with each other. Is not limited. Therefore, in some embodiments, the air from the plurality of housing-side fluid supply holes 114 is configured to once flow into the first circumferential groove 135 or the second circumferential groove 119. Thereby, even if the position of the one end 151 of the first fluid supply hole 150 when viewed along the optical axis AX direction does not coincide with the position of the opening inside the furnace of the casing side fluid supply hole 114, the housing side Air from the fluid supply hole 114 (second fluid supply hole 114) flows into the first fluid supply hole 150.

  In the embodiment shown in FIGS. 8 and 10, the holder main body 131 has a tapered surface 136 formed on the outer peripheral side of the holding portion 133 so as to be displaced from the holding portion 133 in the optical axis AX direction as it goes outward in the radial direction. Have The tapered surface 136 faces the second circumferential groove 119. This facilitates securing the volume of the space formed by the second circumferential groove 119 and the tapered surface 136, that is, the volume of the second circumferential groove 119, and therefore the first fluid supply from the second circumferential groove 119. The amount of air flowing into the holes 150 is suppressed from being biased for each first fluid supply hole 150. Therefore, the amount of air blown from the first fluid supply hole 150 to the perimeter slit 140 is suppressed from being biased depending on the circumferential position of the perimeter slit 140.

In some embodiments, as shown in FIGS. 9 and 10, the air that has flowed into the plurality of first fluid supply holes 150 flows into the circumferential slit 140. And the air which flowed into the perimeter slit 140 is sprayed on the surface inside the furnace of the transparent window 102 from the perimeter slit 140.
Thereby, the air blown out from the all-round slit 140 flows from the radially outer side to the inner side on the inner surface of the transparent window 102, and dust or the like in the gasification furnace 200 is formed on the inner surface of the transparent window 102. It can suppress adhering.
In some of the above-described embodiments, the air from the first fluid supply hole 150 flows into the perimeter slit 140 and is blown from the perimeter slit 140 to the inner surface of the transparent window 102. Thus, the flow of the air blown out from the all-around slit 140 is suppressed from being biased depending on the position of the all-around slit 140 in the circumferential direction.

  In the optical component holder 130 </ b> A of the embodiment shown in FIGS. 3 and 4, each of the first fluid supply holes 150 extends along the optical axis AX direction in the holder main body 131. The air blown out from the other end 152 that opens to the first slit inner wall surface 141 in each of 150 collides with the second slit inner wall surface 142 facing the first slit inner wall surface 141 and diffuses in the entire circumferential slit 140. . Thereby, it is suppressed that the flow of the air which blows off from the perimeter slit 140 is biased by the circumferential position of the perimeter slit 140.

  Moreover, in the optical component holder 130B according to another embodiment shown in FIGS. 5 and 6 and the optical component holder 130C according to still another embodiment shown in FIGS. 7A and 7B, the first fluid supply is performed. Each of the holes 150 extends in the holder main body 131 so as to be shifted in the circumferential direction of the through hole 132 from the one end 151 toward the other end 152. Therefore, the distance until the air blown out from the other end 152 collides with the second slit inner wall surface 142 is longer than the optical component holder 130A of the embodiment shown in FIGS. For this reason, since the air blown out from the other end 152 is more easily diffused in the entire circumferential slit 140, the flow of the air blown out from the entire circumferential slit 140 may be biased depending on the circumferential position of the entire circumferential slit 140. It is further suppressed.

  In the optical component holder 130 of some embodiments shown in FIGS. 3 to 7, the perimeter slit 140 extends beyond the communication position between the perimeter slit 140 and each of the first fluid supply holes 150 to the far side. It extends within the holder body 131. Thereby, since the volume of the perimeter slit 140 can be increased, the air blown out from the other end 152 is more easily diffused in the perimeter slit 140. Therefore, it is further suppressed that the flow of the air blown out from the circumferential slit 140 is biased depending on the circumferential position of the circumferential slit 140.

The in-core imaging device 100 according to some embodiments has the following operational effects.
(1) The optical component holder 130 according to some embodiments has a through-hole 132 through which the optical axis of the transparent window 102 that is an optical component can pass, and is positioned around the through-hole 132 to be a transparent window. A holder main body 131 having a holding portion 133 for holding 102 is provided.
The holder body 131 is formed with an all-around slit 140 that is provided over the entire circumference of the through-hole 132 and opens to the inner wall surface 132 a of the through-hole 132. The holder main body 131 is formed with at least one first fluid supply hole 150 that opens to the surface of the holder main body 131 on the outer peripheral side of the holding portion 133 and communicates with the entire peripheral slit 140.

As a result, the function of holding the transparent window 102 and the function of preventing adhesion of dust and the like to the transparent window 102 can be realized by the optical component holder 130 having a simple configuration. In addition, since the member for holding the transparent window 102 and the member for preventing dust from adhering to the transparent window 102 need not be prepared separately, the in-furnace imaging apparatus 100 using the optical component holder 130 is not required. The maintainability can be improved.
Further, by supplying air from the opening on the surface of the holder main body 131 to the first fluid supply hole 150, the air flowing from the first fluid supply hole 150 into the entire circumferential slit 140 is diffused in the entire circumferential slit 140. However, it is sprayed on the transparent window 102 held by the holding unit 133. Thereby, air can be blown from the entire circumference of the through hole 132 to the surface of the transparent window 102 facing the through hole 132. Therefore, since the bias of the air blown to the transparent window 102 can be suppressed, the effect of preventing the adhesion of dust or the like to the transparent window 102 can be improved.

(2) In some embodiments, the holder main body 131 has a first circumferential groove 135 provided along the circumferential direction on the surface of the holder main body 131. The plurality of first fluid supply holes 150 are open to the bottom surface of the first circumferential groove 135.
Thereby, even if the position of the one end 151 of the first fluid supply hole 150 when viewed along the optical axis AX direction and the position of the opening inside the furnace of the casing-side fluid supply hole 114 are slightly shifted, the first Air is supplied to the first fluid supply hole 150 via the circumferential groove 135. Therefore, the position of the first fluid supply hole 150 does not have to be exactly matched to the position of the opening inside the furnace of the housing-side fluid supply hole 114, which is the supply position of air from the housing 110. Manufacturing becomes easy and manufacturing cost can be suppressed.

(3) In some embodiments, the through hole 132 has a tapered shape in which the inner diameter increases as the distance from the holding portion 133 increases in the optical axis AX direction.
Thereby, the light beam passing through the transparent window 102 held on the holding portion 133 side is not easily blocked by the inner wall surface of the through hole 132.

(4) In some embodiments, the perimeter slit 140 extends in the holder main body 131 so as to go radially inward as the holding portion 133 is approached in the optical axis AX direction.
Thereby, air can be efficiently blown with respect to the transparent window 102 hold | maintained at the holding | maintenance part 133 side.

(5) In some embodiments, each of the first fluid supply holes 150 has an end 151 that opens on the end surface of the holder main body 131 provided with the holding portion 133 and a holder main body so as to form an all-around slit 140. Among the pair of slit inner wall surfaces 141, 142 facing each other inside 131, the other end 152 opened to the first slit inner wall surface 141 located on the end surface side is included.
Thereby, it becomes easy to supply air from the housing 110 side to the first fluid supply hole 150.

(6) In some embodiments, the holding unit 133 includes a holding surface 133a that is orthogonal to the central axis (optical axis AX) of the through hole 132. Of the pair of slit inner wall surfaces 141 and 142 facing each other inside the holder main body 131 so as to form the entire circumferential slit 140, the first slit inner wall surface 141 located on the holding surface 133a side is the inner peripheral edge of the holding surface 133a. , Crosses the holding surface 133a.

  Thereby, since the perimeter slit 140 can be brought close to the holding surface 133a, it is blown out from the perimeter slit 140 also in the vicinity of the inner wall surface 132a of the through-hole 132 among the surfaces of the transparent window 102 held by the holding surface 133a. Air can be blown without stagnation.

(7) In some embodiments, the holder main body 131 has a male threaded portion 134 formed on the outer peripheral surface of the holder main body 131.
Thereby, the optical component holder 130 can be easily attached to the counterpart member.

(8) In some embodiments, each of the first fluid supply holes 150 opens on the surface of the holder main body 131 on the inner peripheral side of the male screw portion 134 and on the outer peripheral side of the holding portion 133.
Thereby, it becomes easy to supply air from the housing 110 side to the first fluid supply hole 150.

(9) In some embodiments, at least one first fluid supply hole 150 of the optical component holder 130 is in communication with a fluid flow path 118 provided inside the housing 110.
Thereby, the path | route which supplies air from the housing | casing 110 to the optical component holder 130 is securable.

(10) In some embodiments, the fluid flow path 118 includes a plurality of second fluid supply holes 114 provided inside the housing 110 and arranged in the circumferential direction. Then, at least one of the holder main body 131 and the housing 110 is a first circumferential groove 135 that is at least one circumferential groove that communicates the plurality of first fluid supply holes 150 and the plurality of second fluid supply holes 114. Alternatively, the second circumferential groove 119 is formed.
As a result, even if the position of the first fluid supply hole 150 and the position of the second fluid supply hole 114 are slightly shifted, the air from the second fluid supply hole 114 is allowed to flow through the first circumferential groove 135 or the second circumferential groove. 119 can be supplied to the first fluid supply hole 150. Therefore, the position of the first fluid supply hole 150 and the position of the second fluid supply hole 114 do not have to be strictly matched, so that the in-furnace imaging apparatus 100 can be easily manufactured and the manufacturing cost can be suppressed.

The present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.
For example, in some embodiments described above, a plurality of the first fluid supply holes 150 are provided, but it is sufficient that at least one first fluid supply hole 150 is provided. In some embodiments described above, a plurality of second fluid supply holes 114 are provided, but at least one second fluid supply hole 114 may be provided.

  In some embodiments described above, the in-furnace imaging apparatus 100 is provided with either the first circumferential groove 135 or the second circumferential groove 119, but the in-furnace imaging apparatus 100 has the first circumference. Both the direction groove 135 and the second circumferential groove 119 may be provided.

  In some embodiments described above, the first circumferential groove 135 and the second circumferential groove 119 are arc-shaped grooves provided over the entire circumference. However, the first circumferential groove 135 or the second circumferential groove 119 may be a partial arc-shaped groove that is interrupted at one or more points along the circumferential direction.

The second circumferential groove 119 only needs to be provided on the surface of the housing 110 facing the holder main body 131 and is not limited to the one shown in FIGS. 8 and 10. For example, as shown in FIG. It may be provided on the inner surface of the wall 112 along the circumferential direction. FIG. 11 is a schematic cross-sectional view of the in-furnace imaging apparatus 100 according to this modification.
That is, the second circumferential groove 119 does not have to be provided radially outside the first fluid supply hole 150 and the second fluid supply hole 114 as shown in FIGS. Similarly to 135, it may be a groove formed so as to connect openings inside the furnace of the plurality of second fluid supply holes 114 (see FIG. 11).

  In some embodiments described above, the fluid for cooling the imaging unit 101 and preventing adhesion such as dust on the transparent window 102 is air. However, the fluid for cooling the imaging unit 101 and preventing adhesion of dust or the like on the transparent window 102 may be another gas such as carbon dioxide or nitrogen, or may be a liquid such as water. A fluid can be used.

  In some embodiments described above, the holder main body 131 holds the transparent window 102 with the holding surface 133 a of the holding portion 133 in direct contact with the transparent window 102. However, another member may be interposed between the holding surface 133 a of the holding unit 133 and the transparent window 102.

  In some embodiments described above, the in-furnace imaging apparatus 100 has been described as an example of the optical apparatus. However, the present invention can be applied to various optical apparatuses other than the in-furnace imaging apparatus 100. That is, for example, the optical component holder 130 according to some embodiments described above may be used for holding a cover glass of a sensor of a detection device that detects the presence or absence of light, luminance, or the like. Further, the optical component holder 130 according to some embodiments described above may be used for holding the optical component of the laser emitting portion of the laser processing apparatus, and for holding the optical component of the light emitting portion of the illumination device. The optical component holder 130 according to some embodiments described above may be used.

100 In-furnace imaging device 101 Imaging unit 102 Transparent window 110 Housing 114 Housing-side fluid supply hole (second fluid supply hole)
118 Fluid flow path 119 Second circumferential groove 130 Optical component holder 131 Holder body 132 Through hole 132a Inner wall surface 133 Holding part 133a Holding surface 134 Male thread part 135 First circumferential groove 136 Tapered surface 140 All-round slit 141 Slit inner wall ( 1st slit inner wall)
142 Slit inner wall surface (second slit inner wall surface)
150 First fluid supply hole 151 One end 152 Other end 200 Gasification furnace

Claims (15)

A through hole through which the optical axis of the optical component can pass is formed, and a holder body having a holding portion for holding the optical component located around the through hole,
In the holder body,
An all-around slit that is provided over the entire circumference of the through-hole and opens on the inner wall surface of the through-hole;
At least one first fluid supply hole that opens to the surface of the holder body on the outer peripheral side of the holding portion and communicates with the all-round slit;
An optical component holder characterized in that is formed. Each of the first fluid supply holes extends in the holder main body so as to be displaced in the circumferential direction of the through-hole as it goes toward a connection end of the first fluid supply hole with the entire circumferential slit. The optical component holder according to claim 1. The said all-around slit is extended in the said holder main body to the back side beyond the communicating position of this all-around slit and each of the said 1st fluid supply hole. The optical component holder according to 1. The at least one first fluid supply hole includes a plurality of first fluid supply holes arranged along the circumferential direction of the through hole on the outer peripheral side of the holding portion,
The holder body has a first circumferential groove provided along the circumferential direction on the surface of the holder body,
4. The optical component holder according to claim 1, wherein the plurality of first fluid supply holes open on a bottom surface of the first circumferential groove. 5. 5. The optical component holder according to claim 1, wherein the through hole has a tapered shape having an inner diameter that increases with distance from the holding portion in the optical axis direction. The said all-around slit is extended in the said holder main body so that it may go to a radial inside as it approaches the said holding | maintenance part in an optical axis direction, The Claim 1 thru | or 5 characterized by the above-mentioned. The optical component holder described. Each of the first fluid supply holes is
One end opening in the end face of the holder body provided with the holding portion;
Of the pair of slit inner wall surfaces facing each other inside the holder main body so as to form the entire circumferential slit, the other end opened to the first slit inner wall surface located on the end surface side,
The optical component holder according to claim 1, comprising: The holding part includes a holding surface orthogonal to the central axis of the through hole,
Of the pair of slit inner wall surfaces facing each other inside the holder main body so as to form the entire circumferential slit, the first slit inner wall surface located on the holding surface side is the holding edge at the inner peripheral edge of the holding surface. The optical component holder according to any one of claims 1 to 7, wherein the optical component holder intersects with a surface. The optical component holder according to any one of claims 1 to 8, wherein the holder main body has a male screw portion formed on an outer peripheral surface of the holder main body. 10. The optical device according to claim 9, wherein each of the first fluid supply holes is open to the surface of the holder body on the inner peripheral side of the male screw portion and on the outer peripheral side of the holding portion. Parts holder. A housing,
An optical component incorporated in the housing;
The optical component holder according to claim 1, wherein the optical component holder is configured to hold the optical component in the housing.
An optical device comprising: The optical device according to claim 11, wherein the at least one first fluid supply hole of the optical component holder communicates with a fluid flow path provided in the housing. The at least one first fluid supply hole is provided inside the holder body, and includes a plurality of first fluid supply holes arranged along the circumferential direction of the through hole on the outer peripheral side of the holding portion,
The fluid flow path includes a plurality of second fluid supply holes provided in the housing and arranged along the circumferential direction,
At least one circumferential groove for communicating the plurality of first fluid supply holes and the plurality of second fluid supply holes is formed in at least one of the holder main body or the housing. Item 13. The optical device according to Item 12. The at least one circumferential groove is
A first circumferential groove provided along the circumferential direction on the surface of the holder body;
Or
The optical apparatus according to claim 13, further comprising at least one of second circumferential grooves provided along the circumferential direction on a surface of the housing facing the holder main body. The at least one circumferential groove includes the second circumferential groove;
The holder body has a tapered surface formed on the outer peripheral side of the holding portion so as to be displaced from the holding portion in the optical axis direction as it goes radially outward.
The optical device according to claim 14, wherein the tapered surface faces the second circumferential groove.

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