WO1992002841A1 - Imaging instrument for observing magnified object - Google Patents

Abstract

An imaging instrument for observing a magnified object, which enables the selection of illuminating beams of light classified as sideway incident, downward incident, and transmitted beams as well as enabling intensive condensation of beams of not only sideway incident light but also downward one. The instrument is provided with a condensing guide at the tip thereof for condensing the illuminating light and throwing light on an object to be observed, and with a light interceptive body inside the condensing body, whereby selection of illuminating beams of light is enabled by selectively closing projecting holes of the condensing guide with the tip of the light interceptive body. Further, with the light projecting hole formed into a specific shape, condensation of downward incident light is also possible.

Description

 Specification

 Imaging device for magnifying observation

〔Technical field〕

 The present invention can be used in various fields such as medical, academic, and industrial fields, for example, by processing the outer surface or surface layer of an observation object such as human skin, microscopic organisms, or integrated circuits in the same position as it is. TECHNICAL FIELD The present invention relates to an image pickup device for magnifying observation that can be magnified and observed without performing image processing.

 (Background technology)

 For example, Japanese Patent Publication Nos. 26642/2001 and 305852/27 or U.S. Pat.No. 4,930,851 describe an imaging device for magnifying observation. Have been.

 These imaging devices are used to reproduce and observe the image of the observation object taken in by the imaging device on a display, that is, a display means. The device itself needs to be fixed in a predetermined state.In contrast to the observation of setting a sample of the object to be observed processed in the prescribed manner in this observation device and observing it, the imaging device Stand-free observation of holding the object by hand and observing the observation object as it is can be done, and anyone can easily do it without any skill or skill, for example, 50 to 100 times It is capable of magnifying observations at a high magnification of 0x.

The most important thing in this kind of magnifying observation is control of illumination light for illuminating the observation position of the observation object or control of image light from the observation object. In other words, the illumination light that illuminates the observation object generally includes the incident light that illuminates the observation object from the front and the steep angle that is almost parallel to the front of the observation object And, in the case of a translucent observation object, transmitted light that illuminates the surface layer from the inside with light transmitted inside. The incident light is suitable for the whole observation, but is easily affected by the reflected light from the surface of the observation object, and the side light is shaded so that it cannot be seen only by the incident light. It is excellent for observing images, and the transmitted light can be used only for translucent objects.However, it is possible to observe the surface of the object with a certain depth in shadow. Each has its own strengths and weaknesses. Therefore, if these lights can be freely selected and appropriately combined, more effective observation can be performed. In particular, in the case of observation of human skin, more effective observation can be performed by utilizing transmitted light. In other words, by illuminating the inner layer with transmitted light, it is possible to observe the surface layer structure, such as the arrangement of capillaries, the state of melanin pigment, etc. well, and the "paste" of makeup that cannot be observed from the surface. The state can be expressed in shadows and shades according to the degree of the "paste", and more meaningful observations can be made, such as being able to grasp quantitatively.

 Regarding such light processing, several technologies have already been proposed.

For example, Japanese Patent Application Publication No. Hei 3 (1985) 2727 mentioned above discloses a condensing guide having a hemispherical front portion and an irradiation hole (small hole) at the front end. Is used to illuminate the observation object. In other words, the condensing guide condenses the illumination light from a large number of light sources arranged in an annular shape on the observation site of the object to be observed. And appropriately combine the incident light and transmitted light with side light (horizontal light) as the main component. ― 8

By doing so, better observation is possible.

 Further, the technique of the above-mentioned U.S. Pat. No. 4,930,851, which is another one, enables selection of image light, and enables more versatile observation. I have.

 However, the light condensing guide in this technology mainly obtains side light only, and relies on illumination light that is not condensed by the light converging guide for incident light. In other words, it is not possible to obtain incident light as strongly focused illumination light. Further, in this technology, no consideration is given to the selective use of side light, incident light, and transmitted light. Therefore, an object of the present invention is to provide an image pickup device capable of selecting the type of illumination light. And

 Another object of the present invention is to provide an imaging device capable of collecting incident light.

 [Disclosure of the Invention]

An imaging device according to the present invention includes an imaging device main body, a light-collecting guide connected to a tip of the imaging device main body, and a light shield provided inside the light-collecting guide. The main body of the imaging device incorporates an optical unit for enlarging the image of the observation object and a light source unit for illuminating the observation object, and the light-condensing guide includes a rear portion and a hemisphere on which the base end surface is formed. It has a front part with an irradiation hole formed in the center and is formed in the center, and the illumination light from the light source means that enters the solid inside from the base end face is guided to the irradiation hole by total internal reflection inside the solid. The observation object is illuminated from the side of the hole. The light shielding body has a tip formed into a shape that allows the irradiation hole of the focusing guide to be closed. The light shield is movable relative to the focusing guide so that the irradiation hole of the guide can be selectively closed. In this imaging device, the illumination light provided by the light source means passes through the space between the inner surface of the light-condensing guide and the outer surface of the light-shielding body, and the incident light that illuminates the observation object from the front through the irradiation hole; Side illumination that illuminates the observation object at a steep angle near parallel to the front by passing through the solid inside of the solid through total reflection and exiting from the irradiation hole, and the observation object from a position other than the irradiation hole Thus, transmitted light that passes through the surface layer and illuminates the observation object from the inside is obtained. Then, by moving the light shield and closing the irradiation hole of the condensing guide at its tip, the incident light and the side light can be reduced to only transmitted light.

 Further, the imaging device according to the present invention includes an imaging device main body, and a light-collecting guide connected to a distal end of the imaging device main body. The main body of the imaging device incorporates an optical unit for enlarging an image of the observation object and a light source unit for illuminating the observation object. It has a front part with a hemispherical body and an irradiation hole formed in the center, and illuminates the illumination light from the light source means that has entered the solid inside from the base end face to the irradiation hole by total internal reflection inside the solid. The side of the hole illuminates the observation object, and the illuminating hole of the focusing guide is the critical angle for the total reflection of the material of the focusing guide, the width of the illuminating hole is d, and the irradiation is It is formed so that t≥d · tan 0, where t is the height of the hole.

In this imaging device, the irradiation hole of the focusing guide is formed so that t ≥ d · tan 0, so that side emission can be obtained from the lower part of the irradiation hole in the same way as the conventional one, and at the same time, the irradiation hole The incident light that falls from the upper part of the object at a steep angle and irradiates the observation target part efficiently can be obtained. In other words, even the incident light can be strongly focused by the focusing guide.c D

Further, also in such an imaging device, similarly to the above, the light shielding body is disposed inside the light collecting guide, and the irradiation hole of the light collecting guide can be selectively closed at the tip of the light shielding body. In this way, it is possible to select the incident light, the side light, and the transmitted light by operating the light shield. In other words, if the irradiation hole is fully open, it is possible to observe in a state where the incident light, side irradiation, and transmitted light are mixed, and if only the upper part of the irradiation hole is closed with a light shield, the incident light will be reduced. Observation can be performed mainly with side emission. If the entire irradiation hole is closed with a light-shielding body, observation can be performed using only transmitted light excluding incident light and side emission.

 Furthermore, with respect to an imaging tool in which the light-shielding body can close the irradiation hole of the light-collecting guide, the light-shielding body is provided with an independently movable part, and the independent movable part is moved relative to other parts to drop the image. Partial irradiation from a specific direction can be performed for the emission light and side emission light. In other words, when the independent movable part is moved and the part of this independent movable part is opened in the state where the entire irradiation hole is closed by the light shielding body, only the side emission light, or the side emission light and the incident light can be emitted from here. This allows partial irradiation from a specific direction.

 Each of the imaging devices is divided into a detachable front block and a rear block, an optical unit is built in the front block, and a light source of the light source unit is built in. The signal processing means for processing the signal from the imaging means and outputting the processed signal to the display means may be incorporated.

By doing so, there is no need to provide an external controller, that is, a signal processing means, and the whole can be reduced in size. Furthermore, the light source and signal processing means are built into the imaging device, and when it comes to the light source, the light source is closer to the object to be observed. This means that the light source itself can be significantly reduced in size, and in terms of signal processing means, the signal processing means is closer to the imaging means, so the capacity of the signal processing means is smaller This means that the signal processing means can be much smaller than in the case, which leads to a significantly smaller signal processing means. In other words, the incorporation of the light source and the signal processing means into the imaging device leads to the downsizing of the light source and the signal processing means, and the organic association that this downsizing also allows the incorporation leads to the overall downsizing. Is what it is.

 [Brief description of drawings]

 FIG. 1 is a partial cross-sectional view of an imaging device according to a first embodiment.

 FIG. 2 is a plan view seen from the direction indicated by arrow A in FIG.

 Fig. 3 is a partially enlarged view showing various light states at the tip of the focusing guide.

 FIG. 4 is a side view as viewed from the direction of arrow B in FIG.

 FIG. 5 is a schematic side view of the imaging device according to the first embodiment.

 FIG. 6 is a partial cross section of the imaging device according to the second embodiment.

 FIG. 7 is a plan view showing the relationship between the light-condensing guide and the light guide means as viewed from the direction indicated by the arrow C in FIG.

 Fig. 8 is an explanatory diagram showing the state of various lights at the tip of the focusing guide.

 FIG. 9 is a partial cross-sectional view of an imaging device according to a third embodiment.

 FIG. 10 is an explanatory view showing a state in which an upper portion of an irradiation hole is closed by a light shielding body. -Fig. 11 is an explanatory view showing a state in which the entire irradiation hole is closed by a light shielding body.

FIG. 12 is a perspective view of a light shield according to a fourth embodiment. ι―

FIG. 13 is an explanatory view showing a state of partial irradiation by an independently movable portion. FIG. 14 is an explanatory view corresponding to FIG. 8 of the light collecting guide according to the fifth embodiment.

 FIG. 15 is a side view including a partial cross-section of the imaging device according to the sixth embodiment, and FIG. 16 is a partial cross-sectional view of a distal end portion of the imaging device of FIG.

 FIG. 17 is a plan view showing the relationship between the base end face of the light guide and the light source, and FIG. 18 is an enlarged cross-sectional view of the light guide near the through hole.

 [Mode for Carrying Out the Invention]

 Hereinafter, embodiments of the present invention will be described.

 First embodiment (Figs. 1 to 5)

 As shown in FIG. 5, an imaging device 1 according to this embodiment includes an imaging device body 2, a light-condensing guide 3, and a light-shielding body 4.

 The imaging device main body 2 is a cylindrical one having a built-in light source means, that is, a light guide means 6 for guiding illumination light for irradiating the observation object M and an optical means 7 for enlarging an image of the observation object M. In addition, an image sensor 8 (CCD device) is built in, and its signal is sent to an observation display via a processing unit (not shown) via a cable 8c, and the observation display increases the magnification by 50 to thousands. Magnification observation is enabled.

The light guide means 6 is for guiding illumination light from a light source provided in a processing apparatus (not shown), and is formed by a large number of optical fibers 19 as shown in FIGS. The ends of the optical fibers 19 are arranged in an annular shape at the connection between the imaging device main body 2 and the light collecting guide 3. Then, as shown in FIG. 3, the light emitted from the tip of each of the optical fibers 19 arranged in the annular shape is partially condensed with the inner surface of the light guide 3 by the light guide 3. Space between the outer surface of the light shield 4 The light enters the condensing guide 3 from the base end face 10 and becomes the incident light Ld and the transmitted light Lt. Although the optical fibers 19 are sparsely shown in FIG. 1, they are actually arranged densely as shown in FIG. _

 The focusing guide 3 has its tip abutted on the surface of the observation object M so that the surface of the observation object M can be moved with respect to the focal point of the objective lens of the optical means 7 (not shown in FIG. 1). As described above, the illumination light from the light guide means 6 is divided into the incident light Ld, the side light Ls, and the transmitted light Lt, and is applied to the observation object M as described above. It is made of highly transparent synthetic resin such as acryl resin.

 Then, the image pickup device main body 2 is screwed to the front end of the image pickup device main body 2 by a screwing screw 11 formed on the rear portion 3r. In this screwed state, the above-described focusing is performed. More specifically, it is composed of a cylindrical rear portion 3 r and a hemispherical front portion 3 f, and a proximal end face 10 is formed at an end of the rear portion 3 r, and the front portion 3 f has the A small irradiation hole 12 is formed in the center of the tip. The irradiation hole 12 is formed in a tapered shape, and the inner surface thereof is formed as a slope 12 f (FIG. 3) having a predetermined angle.

Here, the above-mentioned side light L s is such that the illumination light entering the solid inside of the condensing guide 3 from the base end face 10 passes through the solid inside of the condensing guide 3 by total internal reflection. The object M irradiates the observation object M almost parallel to the front by exiting from the inclined surface 12 f of the irradiation hole 12, and the incident light L d passes through the inner space of the focusing guide 3. The observation object M is illuminated from the front through the irradiation hole 12, and the transmitted light Lt impinges on the observation object M from a part other than the irradiation hole 12 and once passes through the surface layer. Reflected inside and illuminates the surface layer from the inside, transmitted light Lt obtained from the incident light Ld transmitted through the condensing guide 3 at a part other than the irradiation hole 12 and the inclined surface of the irradiation hole 12 There is transmitted light L t obtained from the illumination light reflected by f.

 The rear part 4 r of the light shield 4 has a cylindrical shape in accordance with the inner surface shape of the light collecting guide 3 .The front part 4 f closes the irradiation hole 12 of the light collecting guide 3 at the front end. It has an inverted conical cylindrical shape, which is a possible shape, and a lighting hole 13 is formed at the tip. The light guides 3 are combined so as to be able to move relative to the light guide 3 as indicated by arrows X and Y. When the light guides 3 are moved in the arrow X direction, the tip of the light guides 3 is irradiated with the irradiation holes 1 2 And the incident light Ld and side incident light Ls can be cut.

 Specifically, a bracket projection 14 protruding from the side surface of the light shielding body 4 is engaged with an L-shaped support hole 15 formed on the side surface of the light-condensing guide 3, and further, from the support hole 15 to the outside. The operation ring 16 is attached to the tip of the bracket projection 14 that protrudes from the bracket. Then, when the operation ring 16 is lowered in the direction indicated by the arrow X, the light shield 4 is piled on the biasing force of the spring 17 provided between the light shield 4 and the light-condensing guide 3, and is lowered. The end part enters the irradiation hole 12 of the light guide 3 and fits. This state can be maintained by engaging the bracket projections 14 with the locking portions 15 £ of the support holes 15. However, it is not always necessary to provide the lock portion 15 with the support hole 15 being L-shaped. Further, in order to more quickly open and close the irradiation hole 12 by the light shield 4, the light shield 4 may be electrically driven.

Second embodiment (Figs. 6 to 8) 1 ϋ―

The imaging device 101 of this embodiment is not shown, but has an overall structure similar to that of the imaging device 1 of the first embodiment shown in FIG. Guide 103 is formed.

 Similar to the imaging device body 1 of the first embodiment, the imaging device main body 1 G 2 includes light guiding means 104 (FIGS. 6 and 7) for irradiating the observation object Μ, and the observation object Μ. An optical means 105 for enlarging the image of the image is built in, and although not shown, an image pickup means similar to the image pickup device 1 of the first embodiment is further built in.

 As in the case of the first embodiment, the light guiding means 1G4 guides light from an unillustrated light emitting source into the imaging device main body 102 with an optical fiber cable, and individual light in the optical fiber cable. The optical fiber 107f is formed by arranging the tip of the optical fiber 107f in an annular shape in the imaging device main body 102 as shown in FIG.

 The condensing guide 103 is for condensing the illuminating light from the above-described annular light guiding means 104 to make it more intense illuminating light and irradiating the observation site of the observation object M with For example, it is made of highly transparent synthetic resin such as acryl resin. More specifically, it is composed of a cylindrical rear part 103 r and a hemispherical front part 103 f, and a rear end face 103 formed at the end of the rear part 103 r, An irradiation hole 109 is formed in the center of the front end of the front part 103 f.

 The irradiation hole 109 of this focusing guide 103 is formed so that its width (diameter) is d and its height is t. The relation between d and t is that t ≥ d * tan It is to be. Here, 0 is the material of the light-condensing guide 3, in this example, the critical angle of the acrylic resin, that is, the minimum incident angle at which total reflection of light occurs, which is about 42 °.

By forming the irradiation hole 109 in this way, it is possible to reduce incident light. — 1 i——

However, the light is condensed, and more powerful incident light is obtained. That is,

As shown in Fig. 8, the condensing guide 103 condenses the illumination light from the light guiding means 104 from the light guiding means 104 incident on the solid inside from the base end face〗 08. The illumination light is guided by total reflection inside the solid, concentrated in the irradiation hole 109, and irradiated to the observation object from the side surface 109s. Since the irradiation hole 109 is formed by the relation of t ≥ d · tan, the side emission light from the lower part of the irradiation hole 109 is similar to the focusing guide 103 of the first embodiment. Simultaneously with obtaining Ls, the incident light Ld for irradiating the observation object at a steep angle is obtained from the upper part of the irradiation hole 109. A part of the illumination light propagating inside the solid is not totally reflected but irradiates the observation object M around the irradiation hole 109, that is, around the observation target site, and this becomes the transmitted light Lt. .

 The focusing guide 103 is screwed to the tip of the imaging device main body 102 by a screw 110 formed in the rear portion 103 r, as in the first embodiment. By adjusting the screwing amount, the focus of the observation object M can be adjusted with respect to the optical means 5 in a state where the tip is in contact with the surface of the observation object M.

 Third embodiment (Fig. 9 to Fig. 11)

 FIG. 9 shows a third embodiment, in which a light-shielding body 2 is provided in the inner space of a light-condensing guide 203 having the same structure as the light-condensing guide 103 of the second embodiment described above. This is an example in which 11 is provided.

The light shield 2 11 is composed of a base end side operation unit 2 12 and a distal end light shield 2 13. The operation part 2 12 is a part for operating the entire light shielding body 2 1 1 as shown by arrows X and Y with respect to the condensing guide 203, and a bracket protruding from the side surface thereof. The operation ring 2 passes through the long hole 2 15 formed on the side of the focusing guide 203 The relative movement is made by operating the operation ring 2 16. The light-shielding portion 211 selectively closes the irradiation hole 209 of the focusing guide 203 by the relative movement, and has a cylindrical shape corresponding to the shape of the irradiation hole 209. The inside is formed as a lighting hole 217 through which the image light passes. A spring 218 is interposed between the light shielding member 211 and the focusing guide 203, and the spring 218 is always attached to the light shielding member 211 in a non-blocking direction. I'm trying.

 As shown in FIG. 10, when the upper part of the irradiation hole 109 is closed by the light-shielding body 211, the incident light Ld is eliminated and the side light Ls can be observed as a main body, and As shown in FIG. 11, when the entire irradiation hole 109 is closed, the incident light Lt and the side light Ls are excluded, and observation using only the transmitted light Lt can be performed.

 Fourth embodiment (Figs. 12 to 13)

 FIG. 12 shows a modification of the third embodiment, in which a part of the light shielding body 311 is an independent movable section 319, and the independent movable section 319 is moved relative to other sections. This is an example that can be freely adjusted.

 That is, when the independent movable portion 319 is moved in the direction indicated by the arrow X in a state where the irradiation hole 309 is closed by the light-shielding portion 313, only the portion corresponding to the independent movable portion 319 is opened. As shown in FIG. 13, the side light Ls to the side light Ls and the incident light Ld can be partially irradiated only from a specific direction P, so that more multifaceted observation can be performed.

 Fifth embodiment (Fig. 14)

FIG. 14 shows a condensing guide 430 according to the fifth embodiment. The condensing guide 430 has a front hemispherical shape having the above-mentioned condensing guide. The shape is slightly different from that of Id 203. In other words, while the inner surface, that is, the surface facing the inner space, is made flat around the irradiation hole 209 in the focusing guide 203, the focusing guide 430 The periphery of the irradiation hole 409 is made thick so that the inner surface faces the irradiation hole 409 at a certain slope. As a result, it is possible to obtain the incident light L d that falls at a steeper angle. _C The sixth embodiment (FIGS. 15 to 18)

 As shown in FIG. 15, the imaging device 501 according to this embodiment is divided into a front block 503 and a rear block 504, and the front block 503 is divided into a rear block 503. It can be attached to and detached from 4.

 The front block 503 incorporates therein an optical means 505 for enlarging an object to be observed and a light source, that is, a light source 506 in a light source means provided outside in each of the above embodiments. As in the case of the embodiment, a light-collecting guide 507 is connected to the tip, and a light-shielding body 508 is provided inside the light-collecting guide 507.

 The optical means 505 comprises a cylindrical holder 509 holding an objective lens 510 and other lenses, and the tip of the holder 509 has a tapered light shield. Eaves 5 1 1 are provided. The optical means 505 is basically provided so that the tip of the focusing guide 507 abuts on the surface of the observation object M by bringing the tip of the focusing guide 507 into contact with the surface of the observation object M. Although it is positioned, non-contact observation is also possible by adjusting the screwing state of the focusing guide 507 to the front block 503.

The light source 506 faces the base end face 514 of the light-collecting guide 507 at a position corresponding to the outside of the light-shielding eaves 511 of the holder 509. i 4

It is arranged so that the illumination light does not directly enter the optical means 505. As shown in FIG. 1, as the light source 506, a plurality of minute lamps 506b may be arranged in an annular shape. Alternatively, an annular lamp may be used.

 As in the above-described embodiments, the light-collecting guide 507 has its tip abutted on the surface of the observation object M to observe the focal point of the objective lens 510 of the optical means 505. The illumination light from the light source 506 is divided into incident light L d, side light L s, and transmitted light L t and irradiates the observation object M with the object M so that the surface of the object M matches. It is made of highly transparent synthetic resin such as acryl resin.

 Then, the front block 503 is screwed to the front end of the front block 503 by a screwing screw 513 formed in the rear portion 507 r, and the above-mentioned focusing is performed in this screwed state. ing. More specifically, it is composed of a cylindrical rear portion 507 r and a hemispherical front portion 507 f, and a rear end surface 5r r has a base end face 5 14 at an end thereof. A small irradiation hole 515 is formed at the center of the tip of the front part 507f. The irradiation hole 515 is formed in a tapered shape, and its inner surface is formed as an inclined surface 516 having a predetermined angle (FIGS. 17 and 18).

Here, the above-mentioned side emission L s is the illumination light that has entered the solid inside of the condensing guide 507 from the base end face 5 The light exits from the inclined surface 16 and irradiates the observation object M almost in parallel to the front surface of the observation object M. The incident light L d passes through the inner space of the condensing guide 507 and the irradiation hole 5 15 It illuminates the observation object M from the front, and the transmitted light Lt is other than the irradiation hole 5 15 1 δ 1

The light from the part indicated by 一旦 観 察 層 観 察 観 察 観 察 一旦 観 察 観 察 観 察 観 察 観 察 一旦 一旦 観 察 観 察 落 d d 落 落 落 落 d 落 落 落There is a transmitted light L t obtained from the illumination light reflected by the inclined surface 5 16 of the irradiation hole 5 15 and a transmitted light L t obtained from the illumination surface 5 16.

As in the first embodiment, the light-shielding body 508 has a rear portion 508 r formed into a cylindrical shape in conformity with the inner surface shape of the converging guide 507, but a front portion 508 f has a cylindrical shape. The end of the converging guide 507 has an inverted conical cylindrical shape capable of closing the irradiation hole 515 of the condensing guide 507, and a light-collecting hole 517 is formed at the end. The light guide 507 is combined so as to be able to move relative to the light guide 507 as indicated by arrows X and Y. When the light guide 507 is moved in the X direction, the front end of the light guide 507 is moved. the _c specifically irradiation hole 5 1 5 is closed by incident light L d and side Shako L s is summer as Bok cutlet of bracket protrusion protruding from the side surface of the light shield 5 0 8 5 18 is engaged with the elongated support hole 5 19 formed on the side of the focusing guide 5 07, and the bracket projection 5 18 is connected to the operation ring 5 18 r to operate. The light shield 508 can be moved as indicated by arrows X and Y via the ring 518 r. Note that a spring 520 is interposed between the light shield 508 and the condensing guide 507, and the light shield 508 is always kept upward by the spring 520. It is trying to energize.

 Since the front block 503 can be attached to and detached from the rear block 504, a plurality of dedicated blocks corresponding to the enlargement ratio and the type of the target observation object are prepared in advance and placed. It is possible to selectively use those with special specifications.

The rear block 504 is the observation object obtained by the optical means 505 ] 6

The image pickup means (CCD element) 522 for capturing the magnified image of M and the signal processing means 5 23 for processing the signal from the image pickup means 5 2 2 are built-in. A mating cylinder 524 for connecting the front block 503 protrudes from the surface, and a cable 525 connecting to the display means is led out from the rear end, and the ONZOFF of the light source 506 Switch 526 is provided on the side surface, and the terminal 527 of the lead wire from the switch 526 faces the front end surface and faces the rear end surface of the front block 503. It is designed to be connected to the terminal 528 of the conductor from the light source 506.

 [Industrial applicability]

 In the imaging device according to the present invention, the incident light, the side incident light, and the transmitted light can be selected, and the incident light can also be condensed by the condensing guide, and more powerful illumination light can be obtained. . Therefore, by using such an imaging device, the application field of magnification observation can be further expanded.

Claims

—— i 7 Claims (1) An imaging device body, a light-condensing guide connected to the tip of the imaging device main body, and a light-shielding body disposed inside the light-condensing guide. Built-in optical means for enlarging the image and light source means for illuminating the observation object.The condensing guide has a rear end with a base end face and a hemispherical body, and an irradiation hole is formed in the center. It has a front part, so that the illumination light from the light source means that enters the inside of the solid from the base end surface is guided to the irradiation hole by total internal reflection inside the solid, and irradiates the observation object from the inside surface of the irradiation hole. In the imaging tool for magnifying observation, the tip of the light shield is formed into a shape that can close the irradiation hole of the light guide, and the irradiation hole of the light guide is formed at this tip. The light shield is movable relative to the focusing guide so that it can be selectively closed. Imaging tool for large observation.  (2) An imaging device main body, and a focusing guide connected to the tip of the imaging device main body. The imaging device main body is an optical unit for enlarging an image of an observation object and a light source for illuminating the observation object. The light-collecting guide has a rear part with a base end face formed, and a front part with a hemispherical shape and an irradiation hole formed at the center, and a light-collecting guide from the base end face. An imaging tool for magnifying observation in which the illumination light from the light source means incident on the inside of the solid is guided to the irradiation hole by total reflection inside the solid and illuminates the observation object from the side of the irradiation hole. At The critical hole for the total reflection of the material of the light guide must be such that the critical angle (9, the width of the light hole is d, and the height of the light hole is t, t≥d • tan An imaging device for magnifying observation, characterized in that it is formed in a rectangular shape. 1 δ (3) The light shield is disposed inside the light guide, and the distal end of the light shield is formed into a shape that can block the irradiation hole of the light guide, and the distal end of the light shield is formed. 3. The imaging device according to claim 2, wherein the light shield is movable relative to the light guide so that the irradiation hole of the light guide is selectively closed with the light guide.  (4) The imaging according to any one of claims 1 and 3, wherein a part of the light shield is an independently movable part, and the independent movable part is movable relative to other parts. Utensils.  (5) The imaging device body is divided into a front block and a rear block that can be freely connected and separated, and the light source of the optical unit and the light source unit is captured by the front block, and the enlarged image captured by the optical unit is captured by the rear block. The imaging device according to any one of claims 1 to 4, wherein a signal processing unit that processes a signal from the imaging unit and outputs the processed signal to a display unit is incorporated.