Intraoral measurement device

Abstract

To provide an oral cavity measurement device in which dew condensation in a light transmission window is prevented in a configuration in which a prism is covered with a cover with the light transmission window via a space part.SOLUTION: An oral cavity measurement device includes: a device body 10 in which a base end side of a prism 12 is held by a housing; a cover member 100 attached to the device body in a state of covering a tip end side of the prism arranged to face a measurement object via a space part and having a portion arranged to face the measurement object composed of a light transmission window 101; and a heat transmission member 13 extending from the device body along a non-optical surface of the prism, in which, when a projection end provided to project from the prism abuts on the light transmission window of the cover member, heat from the device body is transmitted to the light transmission window. The non-optical surface of the prism is provided with a positioning member 14 projecting from the non-optical surface in an opposite direction from the projection end of the transmission member. When the positioning member is pressed to a projection end side by an inner wall of the cover member attached to the device body, the prism and the projection end of the heat transmission member are pressed to the light transmission window side.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to an intra-oral measurement device. [Background technology]

[0002] An intraoral measuring device is a technology for measuring the intraoral shape of teeth and gums. As a technology related to such a device, there is a technology disclosed in the following Patent Document 1. This Patent Document 1 describes a configuration in which a cover-like tip with a mirror is attached to a tube, which is a part of the main body, and the tip is removed and sterilized at the end of treatment to reuse the tip. In addition, in order to prevent condensation on the front window provided at the tip of the tube and the mirror provided on the tip, a thermally conductive sheet is provided at the tip (tube) of the scanner body, and the thermally conductive sheet is extended from behind the mirror to an area that physically contacts the tube. As a result, the heat generated by heating the tube is transmitted to the front window and mirror through the thermally conductive sheet, and the temperatures of the front window and mirror rise, preventing condensation of moisture. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Publication No. 2015 / 0018613 Summary of the Invention [Problem to be solved by the invention]

[0004] In another embodiment of the intra-oral measurement device, the tip of the main body is made of a prism, and the tip is covered by a cover with a light-transmitting window in a removable manner. In this type of configuration, the measurement light enters and leaves the prism through the light-transmitting window in the cover, so the heat-conducting sheet cannot be attached to the entire surface of the light-transmitting window.

[0005] Furthermore, in order to heat the light-transmitting window provided on the cover side in such a configuration, the tip of the electric heating sheet provided on the main body side where the heat source is located must be configured to protrude outward from the prism at a position opposite the light-transmitting window, and the protruding end of the electric heating sheet must be abutted against the light-transmitting window when the cover is attached to the main body.

[0006] However, since the prism surface facing the light-transmitting window is a total reflection surface and an air gap is required between the prism and the light-transmitting window, there is some degree of play in the position of the prism relative to the cover, which makes it difficult to abut the protruding end of the electric heating sheet against the light-transmitting window, and makes it impossible to reliably prevent condensation on the light-transmitting window.

[0007] Therefore, an object of the present invention is to provide an intra-oral measurement device that can reliably prevent condensation on a light-transmitting window in a configuration in which a prosm is covered through a space with a cover with a light-transmitting window. [Means for solving the problem]

[0008] In order to solve the above problem, the present invention is an intra-oral measurement device comprising: a device main body that holds the base end side of a prism by a housing that contains an illumination member and an imaging member; a cover member that is attached to the device main body in a state where it covers the tip side of the prism that is positioned opposite the measurement object via a space, and the portion that is positioned opposite the measurement object is constituted by a light-transmitting window; and a heat transfer member that extends from the device main body along the non-optical surface of the prism and transfers heat from the device main body to the light-transmitting window by having a protruding end that protrudes from the prism abut against the light-transmitting window of the cover member, wherein a positioning member is provided on the non-optical surface of the prism and protrudes from the non-optical surface in a direction opposite to the protruding end of the heat transfer member, and the positioning member is pressed toward the protruding end side by the inner wall of the cover member attached to the device main body, thereby pressing the protruding ends of the prism and the heat transfer member toward the light-transmitting window side. Effect of the Invention

[0009] According to the present invention, it is possible to provide an intra-oral measurement device that can reliably prevent condensation on the light-transmitting window in a configuration in which a prosm is covered through a space with a cover with a light-transmitting window. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is an overall configuration diagram (part 1) for explaining the configuration of an intra-oral measurement device according to a first embodiment. [Diagram 2] FIG. 2 is an overall configuration diagram (part 2) for explaining the configuration of the intra-oral measurement device according to the first embodiment. [Diagram 3] FIG. 1 is an enlarged view (part 1) of a main part for explaining the configuration of the intra-oral measurement device according to the first embodiment. [Figure 4] FIG. 2 is an enlarged view (part 2) of a main part for explaining the configuration of the intra-oral measurement device according to the first embodiment. [Diagram 5] FIG. 3 is an enlarged view (part 3) of a main part for explaining the configuration of the intra-oral measurement device according to the first embodiment. [Figure 6] FIG. 4 is an enlarged view (part 4) of a main part for explaining the configuration of the intra-oral measurement device according to the first embodiment. [Figure 7] 1 is a cross-sectional view of a main part of an intra-oral measurement device according to a first embodiment. [Figure 8] 4 is a cross-sectional view of a main part of an intra-oral measurement device of a modified example according to the first embodiment. FIG. [Figure 9] FIG. 11 is an enlarged view (part 1) of a main part for explaining the configuration of an intra-oral measurement device according to a second embodiment. [Figure 10] FIG. 11 is an enlarged view (part 2) of a main part for explaining the configuration of the intra-oral measurement device according to the second embodiment. [Figure 11] FIG. 11 is a cross-sectional view of a main part of an intra-oral measurement device according to a third embodiment. [Figure 12] FIG. 11 is an enlarged view of a main part for explaining the configuration of an intra-oral measurement device according to a fourth embodiment. [Figure 13] FIG. 13 is an enlarged view of a main part for explaining the configuration of an intra-oral measurement device according to a fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, embodiments of an intra-oral measurement device to which the present invention is applied will be described in detail with reference to the drawings. In each embodiment described below, the same components are given the same reference numerals and duplicated descriptions will be omitted.

[0012] First Embodiment 1 and 2 are overall configuration diagrams (part 1) and (part 2) for explaining the configuration of an intra-oral measurement device 1 according to the first embodiment. The intra-oral measurement device 1 shown in these figures is for capturing 3D images of the oral cavity, for example, and includes a device body 10 and a cover member 100 that is removable from the device body 10. FIG. 1 is an overall configuration diagram of the device body 10 with the cover member 100 attached, and FIG. 2 is an overall configuration diagram of the device body 10 with the cover member 100 removed. The configurations of the device body 10 and the cover member 100 will be described below in order.

[0013] <Device body 10> The device body 10 comprises a housing 11 that houses optical components, a prism 12 that is provided with its tip protruding from the housing 11, a heat transfer member 13 that is provided on the side wall of the prism 12, and a positioning member 14. The device body 10 that comprises these members also has a heat source. Each element that constitutes the device body 10 will be described below.

[0014] [Chassis 11] The housing 11 houses optical components and holds the base end side of the prism 12. The optical members housed in the housing 11 are an illumination member 11a and an imaging member 11b. The housing 11 houses these optical members so that the measurement light irradiated from the illumination member 11a is incident on the prism 12, and the measurement light emitted from the prism 12, reflected by a measurement object (not shown), and again incident on the prism 12 is incident on the imaging member 11b. Among them, the illumination member 11a is provided with a light source such as an LED (light emitting diode). This light source is an example of a heat source of the heat transfer member 13 described below. Note that the heat source of the heat transfer member 13 is not limited to the light source provided in the illumination member 11a, and may be another member constituting the device main body 10, such as the housing 11 or another member whose description is omitted here.

[0015] [Prism 12] The prism 12 has an elongated shape extending from the housing 11, and the tip side of the elongated shape extending from the housing 11 is inserted into the oral cavity, and a cover member 100 is attached to this tip side. The end of the prism 12 held by the housing 11 is the base end side, and the illumination member 11a and the imaging member 11b are arranged on this base end side.

[0016] FIG. 3 is an enlarged view (part 1) of a main part for explaining the configuration of the intra-oral measurement device 1 according to the first embodiment, which is an enlarged view of the tip side of the prism 12 and shows the optical path of the measurement light [H]. Referring to FIG. 3, FIG. 1 and FIG. 2, the prism 12 reflects the measurement light [H] supplied from the illumination member 11a multiple times inside and guides it to the tip side, and irradiates the measurement light [H] on the measurement object [T]. The measurement object [T] is, for example, teeth or gums in the oral cavity. The prism 12 also reflects the measurement light [H] reflected by the measurement object [T] multiple times inside and guides it to the imaging member 11b.

[0017] Here, the prism 12 is, for example, a rectangular column having a non-optical surface 12a facing the front in the drawing and another non-optical surface 12a substantially parallel to the non-optical surface 12a, with the non-optical surfaces 12a as the bottom surfaces. The side walls of the rectangular column are arranged perpendicular to the xz plane and parallel to the y direction. In such a prism 12, the multiple side walls arranged perpendicular to the xz plane become optical surfaces 12b. These optical surfaces 12b are all surfaces composed of flat surfaces. Among them, the optical surface on the base end side of the prism 12, which is omitted in FIG. 3, is a light transmitting surface, and the other optical surfaces 12b are light reflecting surfaces that totally reflect the measurement light [H].

[0018] The optical surfaces 12b of the prism 12, excluding the optical surface on the base end side of the prism 12 that is not shown in FIG. 3, are, for example, the first surface 12ba, the second surface 12bb, and the third surface 12bc in the order of arrival of the measurement light [H] irradiated from the illumination member 11a. The measurement light [H] is totally reflected by the third surface 12bc, and then irradiated again to the second surface 12bb, and passes through the second surface 12bb to be irradiated to the measurement object [T]. The area of ​​the second surface 12bb that is particularly disposed opposite the measurement object [T] and through which the measurement light [H] passes is referred to as the objective surface 12bb'.

[0019] [Heat transfer material 13] 1 to 3, the heat transfer member 13 is a thin, long plate-like member made of a material with good thermal conductivity such as silver, copper, gold, aluminum, nickel, platinum, etc. Such heat transfer member 13 is drawn out from a light source portion of the illumination member 11a that serves as a heat source, extended along the non-optical surface 12a of the prism 12, and disposed so as to protrude from the prism 12 on the side of the objective surface 12bb'.

[0020] In the heat transfer member 13, the length of the protruding end 13a protruding from the prism 12, i.e., the protruding length [d] (see Figure 3), is slightly larger than the distance between the optical surface 12b (particularly the second surface 12bb) and the inner wall of the cover member 100 when the cover member 100 is attached to the prism 12.

[0021] Such heat transfer member 13 may be fixed, for example, by adhesion, to device body 10 including prism 12. Heat transfer member 13 may be provided along each of two non-optical surfaces 12a of prism 12, or may be provided only on one of non-optical surfaces 12a.

[0022] [Positioning member 14] 4 is an enlarged view (part 2) of a main part for explaining the configuration of the intra-oral measurement device according to the first embodiment, and is an enlarged view of the tip side of the prism 12. As shown in this figure, the positioning member 14 is, for example, a sheet-like member that covers the non-optical surface 12a of the prism 12, and is arranged to overlap the heat transfer member 13. In FIG. 4, the configuration in which the heat transfer member 13 is sandwiched between the non-optical surface 12a of the prism 12 and the positioning member 14 is illustrated, but the positioning member 14 may be sandwiched between the non-optical surface 12a of the prism 12 and the heat transfer member 13.

[0023] The positioning member 14 is shaped to protrude outward from the prism 12 on the first surface 12ba side of the optical surface 12b, i.e., the side opposite to the side on which the heat transfer member 13 protrudes. Furthermore, the positioning member 14 may also protrude outward from the prism 12 on the second surface 12bb side including the objective surface 12bb', i.e., the side on which the heat transfer member 13 protrudes, and may also protrude from the prism 12 on the third surface 12bc side as shown in the figure.

[0024] The length by which positioning member 14 protrudes from prism 12 is within a range that does not prevent insertion of prism 12, with positioning member 14 attached, into cover member 100, which will be described next. In particular, on the second surface 12bb side, it is essential that the length be shorter than protruding end 13a of heat transfer member 13, thereby preventing positioning member 14 from preventing protruding end 13a of heat transfer member 13 from abutting against cover member 100.

[0025] The thickness of the positioning member 14 is set within a range that does not prevent the insertion of the prism 12 with the positioning member 14 attached to the cover member 100 described below. Even if the heat transfer member 13 is disposed on only one of the two non-optical surfaces 12a of the prism 12, it is preferable that the positioning member 14 is disposed on both non-optical surfaces 12a. This makes it possible to stably maintain the position of the prism 12 inserted into the cover member 100.

[0026] Such a positioning member 14 is for pressing the protruding end 13a of the heat transfer member 13 toward the cover member 100 by pressing the peripheral edge of the heat transfer member 13 opposite the protruding end 13a toward the protruding end 13a by the inner wall of the subsequent cover member 100. The material of such a positioning member 14 is not limited, but it may be made of, for example, a resin material or a metal material, and the positioning member 14 itself may be made of a heat transfer material.

[0027] <Cover member 100> 5 and 6 are enlarged views (part 3) and (part 4) of the main part for explaining the configuration of the intra-oral measurement device 1 according to the first embodiment, and are enlarged views of the prism 12 and the cover member 100 covering it. As shown in these Figs. 5 and 6 and the above Figs. 1 and 2, the cover member 100 is a member that covers the tip side of the prism 12 that is provided in the device body 10 so as to protrude from the housing 11, and is freely attachable to and detachable from the device body 10.

[0028] The cover member 100 has a cylindrical shape following the outer shape of the prism 12, with one end closed and the other end serving as an insertion opening 100a for the prism 12. Such a cover member 100 forms a space between the prism 12 and the cover member 100 by attaching the cover member 100 to the device body 10 along the outer shape of the prism 12. This space becomes an air layer. In this state, the prism 12 is sealed inside the housing 11 of the device body 10 and the cover member 100. Such a cover member 100 includes a light-transmitting window 101 and an elastic member 102.

[0029] [Light-transmitting window 101] The light-transmitting window 101 constitutes a part of the wall of the cover member 100, and is disposed opposite the objective surface 12bb' of the prism 12 when the cover member 100 is attached to the device body 10. Such a light-transmitting window 101 is made of glass or a resin material.

[0030] [Elastic member 102] The elastic member 102 is provided at a position and with a size such that it presses the positioning member 14 from the first surface 12ba side to the second surface 12bb side of the prism 12 in a state in which the cover member 100 is attached to the device body 10. The second surface 12bb of the prism 12 is the surface in the direction in which the heat transfer member 13 protrudes from the prism 12, and is the surface facing the light transmitting window 101.

[0031] Such an elastic member 102 is provided, for example, on the inner wall of the cover member 100 facing the first surface 12ba of the prism 12 in a position facing the peripheral edge of the positioning member 14 when the cover member 100 is attached to the device body 10. Such an elastic member 102 is not limited to a leaf spring as shown in the figure, and may be made of an elastic material such as rubber. The elastic member 102 may also be formed integrally with the cover member 100, which prevents an increase in the number of parts.

[0032] <Advantages of the First Embodiment> According to the first embodiment described above, the positioning member 14 provided to protrude from the prism 12 is pressed by the inner wall of the cover member 100, and the prism 12 and the heat transfer member 13 are pressed toward the light transmission window 101 via the positioning member 14. As a result, since a space is present between the prism 12 of the device body 10 and the cover member 100, the protruding end 13a of the heat transfer member 13 can be abutted against the light transmission window 101 even if there is play in the installation between the prism 12 of the device body 10 and the cover member 100.

[0033] Here, Fig. 7 is a cross-sectional view of a main part of the intra-oral measurement device 1 according to the first embodiment, which corresponds to the cross section AA in Fig. 6. As shown by the arrows in Fig. 7 and Fig. 6, the protruding end 13a of the heat transfer member 13 is pressed against the light-transmitting window 101 side of the cover member 100 in response to the pressing of the positioning member 14, so that the protruding end 13a of the heat transfer member 13 is easily brought into contact with the light-transmitting window 101 (see Fig. 7A). As a result, it is possible to reliably prevent condensation on the light-transmitting window 101.

[0034] 8 is a cross-sectional view of a main part of an intra-oral measurement device 1' of a modified example according to the first embodiment, which corresponds to the cross section AA in FIG. 6. The modified example shown in this figure is an example in which a heat transfer member 13 and a positioning member 14 are provided on each of two non-optical surfaces 12a of the prism 12. In this case, too, the protruding end 13a of each heat transfer member 13 is easily brought into contact with the light-transmitting window 101 (see FIG. 8A). As a result, it is possible to more reliably prevent condensation on the light-transmitting window 101 due to heating from the two heat transfer members 13.

[0035] Second Embodiment 9 and 10 are enlarged views (part 1) and (part 2) of a main part for explaining the configuration of an intra-oral measurement device 2 according to a second embodiment. The intra-oral measurement device 2 of the second embodiment shown in these Figs. 9 and 10 differs from the intra-oral measurement device 1 of the first embodiment described using Figs. 1 to 8 in that an elastic member 15 is attached to the positioning member 14 on the device body 10 side. Therefore, no elastic member is provided on the cover member 100. The other configurations are similar to those of the intra-oral measurement device 1 of the first embodiment.

[0036] In this case, the elastic member 15 is positioned and sized to press the positioning member 14 from the first surface 12ba side to the second surface 12bb side of the prism 12 via the cover member 100 when the cover member 100 is attached to the device main body 10.

[0037] Such an elastic member 15 is provided, for example, on the peripheral edge of the positioning member 14 protruding from the first surface 12ba of the prism 12. Such an elastic member 102 is not limited to a leaf spring as shown in the figure, and may be made of an elastic material such as rubber. Furthermore, the elastic member 15 may be formed integrally with the positioning member 14, which prevents an increase in the number of parts.

[0038] <Effects of the second embodiment> In the intra-oral measurement device 2 of the second embodiment described above, the protruding end 13a of the heat transfer member 13 is pressed against the light transmission window 101 side of the cover member 100 in response to the pressing of the positioning member 14 from the cover member 100 side. Therefore, the same effect as that of the first embodiment can be obtained.

[0039] Third Embodiment Fig. 11 is a cross-sectional view of a main part of an intra-oral measurement device 3 according to a third embodiment, which corresponds to the cross section AA in Fig. 6. The intra-oral measurement device 3 of the third embodiment shown in Fig. 11 differs from the intra-oral measurement device 1 of the first embodiment described with reference to Figs. 1 to 8 in the shape of the protruding end 13a' of the heat transfer member 13' provided along the non-optical surface 12a of the prism 12. The other configurations are similar to those of the intra-oral measurement device 1 of the first embodiment.

[0040] In the heat transfer member 13', a protruding end 13a' protruding from the prism 12 is bent at the tip of the protruding length [d] (see FIG. 3) along the objective surface 12bb' of the prism 12. That is, the tip of the protruding end 13a' of the heat transfer member 13' is bent in parallel with the light transmitting window 101 in a state in which the cover member 100 is attached to the device body 10.

[0041] The tip of the protruding end 13a', that is, the length from the bent portion to the tip side, is set within a range that does not affect the transmission of the measurement light at the objective surface 12bb'. The material of the bent portion and the tip side is set to be a material with good thermal conductivity such as silver, copper, gold, aluminum, nickel, platinum, like the device main body of the heat transfer member 13', and may be the same material as the device main body or a different material. However, the bent portion of the heat transfer member 13' is preferably elastic in consideration of mechanical strength, and is made of an elastic material or has an elastic structure, for example, by fine bending. The heat transfer member 13' may be made of the same material as a whole. Furthermore, the plate thickness of the bent portion may be partially increased or the structure may be reinforced by being supported by a separate body.

[0042] <Effects of the third embodiment> According to the third embodiment described above, it is possible to increase the contact area between the protruding end 13a' of the heat transfer member 13' and the light-transmitting window 101, compared to the other embodiments. Therefore, the heat transfer effect from the protruding end 13a' to the light-transmitting window 101 is improved, and it is possible to more reliably prevent condensation on the light-transmitting window 101.

[0043] Fourth Embodiment Fig. 12 is an enlarged view of a main part for explaining the configuration of an intra-oral measurement device 4 according to a fourth embodiment. The intra-oral measurement device 4 of the fourth embodiment shown in Fig. 12 differs from the intra-oral measurement device 1 of the first embodiment explained using Figs. 1 to 8 in that a positioning mechanism is provided in the housing 11 of the device main body 10 and the cover member 100, and the other configurations are similar to those of the intra-oral measurement device 1 of the first embodiment.

[0044] That is, in the housing 11 of the device body 10, a positioning pin 16 serving as a fitting portion is erected along the extension direction of the prism 12 at a position where the peripheral edge of the insertion port 100a of the cover member 100 abuts. Meanwhile, in the cover member 100, a positioning hole 103 into which the positioning pin 16 is inserted is provided as a fitting portion at a position where the peripheral edge of the housing 11 of the device body 10 abuts. The positioning pin 16 and the positioning hole 103 form a positioning mechanism between the device body 10 and the cover member 100.

[0045] It is preferable that the positioning mechanism consisting of the positioning pins 16 and the positioning holes 103 is disposed in at least two places. Also, the positioning pins 16 and the positioning holes 103 may be reversed, and the positioning pins may be provided in the cover member 100 and the positioning holes may be provided in the housing 11.

[0046] <Effects of the Fourth Embodiment> According to the fourth embodiment described above, by providing a positioning mechanism for the housing 11 and the cover member 100, the mounting state of the cover member 100 when mounted on the device body 10 can be kept constant. Therefore, even if a space is interposed between the prism 12 of the device body 10 and the cover member 100, it is possible to eliminate any wobble when mounting the prism 12 of the device body 10 and the cover member 100. This also ensures that the protruding end 13a of the heat transfer member 13 and the light transmitting window 101 abut against each other, so that condensation on the light transmitting window 101 can be reliably prevented.

[0047] Fifth embodiment FIG. 13 is an enlarged view of a main part for explaining the configuration of an intra-oral measurement device 5 according to a fifth embodiment. The intra-oral measurement device 5 of the fifth embodiment shown in FIG. 13 differs from the intra-oral measurement device 1 of the first embodiment described using FIGS. 1 to 8 in the shape of a heat transfer member 13" provided along the non-optical surface 12a of a prism 12. The other configurations are similar to those of the intra-oral measurement device 1 of the first embodiment.

[0048] In other words, the heat transfer member 13" is not limited to being a thin, elongated member, but may be a thin, plate-like member having a wide shape that conforms to the non-optical surface 12a of the prism 12. In this case, as shown in FIG. 13, the heat transfer member 13" is formed so that its surface area is wide from the illumination member 11a, which has a light source portion that serves as a heat source, toward the non-optical surface 12a of the prism 12, and has approximately the same surface shape as the non-optical surface 12a at the non-optical surface 12a of the prism 12, and may protrude from the non-optical surface 12a to an extent that does not affect the attachment of the cover member 100.

[0049] In this case, it is preferable that the protruding end of the heat transfer member 13" protrudes from the non-optical surface 12a of the prism 12 with a width approximately the same as the light-transmitting window 101 of the cover member 100. Here, approximately the same includes a width identical to the width of the light-transmitting window 101, and preferably means a width that is 80% or more, and more preferably 90% or more, of the width of the light-transmitting window, and it is even more preferable that the width is larger than the width of the light-transmitting window 101 taking into account positional misalignment. This results in a configuration in which the protruding end 13a" of the heat transfer member 13" protruding from the non-optical surface 12a abuts against the light-transmitting window 101 of the cover member 100 over a wide area.

[0050] <Effects of the Fifth Embodiment> According to the fifth embodiment described above, the surface area is formed wide from the illumination member toward the non-optical surface of the prism, so that heat generated in the illumination member can be effectively transferred to the light-transmitting window 101 by the heat-transfer member 13". Such improvement in heat conduction efficiency makes it possible to reliably prevent condensation on the light-transmitting window 101.

[0051] The above-described embodiments and modifications can be combined with each other, and the respective effects can be obtained by combining them. [Explanation of symbols]

[0052] 1,1',2,3,4,5...Intraoral measurement device 10...Device body 11…Housing 11a…Lighting components 11b...imaging member 12. Prism 12a…Non-optical surface 12b…Optical surface 12ba…Side 1 12bb…Second side 12bb'...Object plane 12bc...Side 3 13,13,13"...Heat transfer material 13a,13a',13a"...Protruding end 14... Positioning member 15...Elastic member 16...Locating pin (fitting part) 100...Cover member 101...Light-transmitting window 102...Elastic member 103... Positioning hole (fitting portion) [T]…Measurement object

Claims

1. a device body in which a base end side of the prism is held by a housing that houses an illumination member and an imaging member; a cover member attached to the device body in a state of covering, via a space, a tip side of the prism that faces the measurement object, and a portion that faces the measurement object is constituted by a light transmitting window; a heat transfer member extending from the device body along a non-optical surface of the prism and having a protruding end protruding from the prism abutting against the light-transmitting window of the cover member, thereby transferring heat from the device body to the light-transmitting window, a positioning member is provided on a non-optical surface of the prism, the positioning member protruding from the non-optical surface in a direction opposite to the protruding end of the heat transfer member; The positioning member is pressed toward the protruding end by an inner wall of the cover member attached to the apparatus body, thereby pressing the protruding ends of the prism and the heat transfer member toward the light transmitting window. Intraoral measurement device.

2. The cover member is freely attachable to the device body. The intraoral measurement device according to claim 1 .

3. the positioning member is a sheet-like member having peripheral edges protruding from the non-optical surface of the prism on the protruding end side of the heat transfer member and on the opposite side thereof, The protruding end of the heat transfer member protrudes larger than the positioning member. The intraoral measurement device according to claim 1 or 2.

4. An elastic member is provided on an inner wall of the cover member to press the positioning member against the protruding end of the heat transfer member. The intraoral measurement device according to any one of claims 1 to 3.

5. The elastic member is integrally formed with the cover member. The intraoral measurement device according to claim 4.

6. The positioning member is provided with an elastic member for pressing the prism and the positioning member toward the protruding end of the heat transfer member via the inner wall of the cover member. The intraoral measurement device according to any one of claims 1 to 3.

7. The elastic member is integrally formed with the positioning member. The intraoral measurement device according to claim 6.

8. The prism has two non-optical surfaces disposed opposite each other; The heat transfer member is provided on at least one of the two non-optical surfaces. The intraoral measurement device according to any one of claims 1 to 7.

9. The prism has two non-optical surfaces disposed opposite each other; The heat transfer member is provided on both of the two non-optical surfaces. An intra-oral measurement device according to any one of claims 1 to 8.

10. The positioning members are provided for the two non-optical surfaces, The intraoral measurement device according to claim 8 or 9.

11. The protruding end of the heat transfer member is bent so that a tip end of the protruding end of the heat transfer member is parallel to the light transmitting window of the cover member when the cover member is attached to the apparatus body. An intraoral measurement device according to any one of claims 1 to 10.

12. The heat transfer member has an elastic bent portion at the protruding end. The intraoral measurement device according to claim 11.

13. The device body and the cover member have a plurality of fitting portions that fit together when the cover member is attached to the device body. An intra-oral measurement device according to any one of claims 1 to 12.

14. The heat transfer member transfers heat generated by the illumination member to the light-transmitting window. An intra-oral measurement device according to any one of claims 1 to 13.

15. The heat transfer member is formed so that its surface area is wide from the illumination member toward the non-optical surface of the prism. The intraoral measurement device according to claim 14.

16. The protruding end of the heat transfer member is provided to protrude from the non-optical surface of the prism with a width approximately equal to that of the light transmitting window of the cover member. The intraoral measurement device according to claim 15.

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