JPH1172712A - Transmission illuminator for stereomicroscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the reflection angle of a deflecting member shallow even when the diameter of luminous flux is made large and to make height from the upper surface of a stage to the base of a transmission illumination frame low by arranging the optical axis of emitted light from a light source in the transmission illumination frame so that it may be inclined obliquely downward and illuminating a sample in a state where the optical axis of the emitted light is deflected upward by a deflecting member. SOLUTION: In the bright field optical system of the transmission illumination frame; the light source 1 such as a halogen lamp is disposed in a housing 03 constituted of a housing main body 01 and a base plate 02 so that the optical axis of the emitted light may be inclined obliquely downward to the horizontal optical axis of the emitted light. Then, the optical axis of the emitted light from the light source 1 is perpendicularly deflected by the deflecting member 6 such as a mirror so as to illuminate a sample 9 arranged on a sample placing glass 8 provided at the aperture part 01a of the main body 01. A collector lens 2, filters 3a to 3c which can be attached/detached by a filter switching mechanism, a diffusion plate 4 and a convex lens 5 are disposed on an optical axis between the light source 1 and the member 6, and a convex lens 7 having a Fresnel surface 7a and a diffusion surface 7b is disposed between the member 6 and the sample placing transparent member 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereomicroscope transmission illumination device.

[0002]

2. Description of the Related Art A first example of a conventional stereomicroscope illuminating device is disclosed, for example, in Japanese Utility Model Publication No. 41-5808, and as shown in FIG. The light emitted from the light source 31 passes through the collector lens 32 placed horizontally, illuminates the diffusion plate 33, deflects the light vertically by the mirror 34 using the diffusion plate 33 as a second light source, and then passes through the condenser lens 35. The sample 36 is illuminated. FIG. 11A is a diagram of the stereomicroscope viewed from the side, and FIG. 11B is a diagram of the stereomicroscope viewed from the front.

In FIG. 11, a knife edge 37 is disposed on a diffusion plate 33 so as to be freely inserted and removed. After the light emitted from the light source 31 is condensed by the collector lens 32, the diffuser 33 is illuminated.
Is used as a second light source for illumination. Knife edge 3
Dark field illumination for observing only the diffracted light of the sample 36 is also possible by moving the 7 up and down to block direct light from entering the microscope pupil. Reference numeral 38 denotes an objective lens, and 39 denotes an eyepiece.

A second example of a conventional illuminating device for performing dark field illumination is disclosed in, for example, Japanese Utility Model Publication No. 45-11051. As shown in the sectional view of FIG. A dark field illumination for illuminating an upper sample 36 by reflecting light traveling in the peripheral direction by a cylindrical mirror 40 and a light field perpendicular to the light emitted vertically from the light source 31 by the diffusion plate 3 are arranged in a bright field. Switching between bright field and dark field is performed by interrupting illumination with a shutter 41.

In FIG. 12, reference numeral 42 denotes a container;
Is an arm, 44 is a lid, 45 is a window, 46 is a support frame, 47 is a connecting rod, 48 is a support portion, 49 is a bowl-shaped frost plate, 50 is a rainbow collecting aperture, 51 is a light shielding portion for preventing stray light, 52 is It is a bearing frame. Also, in any conventional example, the lens is circular.

[0006]

In recent years, stereo microscopes have been systematized and are required to have a wide magnification range. Also, ease of use is important. In order to cope with the magnification range, it is required to uniformly illuminate a wide field of view, and for ease of use, a sample surface as low as possible is required.

In the first prior art described above, in order to enlarge the field of view, the size of the diffusion plate 33 must be increased, the diameter of the light beam must be increased, and the size of the mirror 34 must also be increased. Becomes too thick, and it is impossible to achieve both wide field of view and low stage.

Further, in the second prior art, since a dark-field device has a bright-field optical path vertically, it is impossible to uniformly illuminate a wide field with a short optical path distance.
Furthermore, in a dark field device, both the bright field and the dark field use light from a light source in a part of the direction, and the efficiency is extremely low.

According to the present invention, the height from the upper surface of the sample mounting transparent member on which the sample is mounted to the lower surface of the transmission illumination base can be reduced,
Further, it is another object of the present invention to provide a stereoscopic microscope transmission illumination device that can obtain uniform illumination even when switching to either the bright-field optical system or the dark-field optical system, and can simultaneously obtain both effects.

[0010]

According to a first aspect of the present invention, a light source in a transmission illumination mount is disposed such that an emission optical axis of the light source is inclined obliquely downward.
A stereomicroscope transmission illumination apparatus characterized in that the output optical axis is deflected upward by a deflection member to illuminate a sample placed on the transmission illumination mount.

According to the first aspect of the invention, the light beam diameter of the light source is increased by arranging the emission optical axis of the light source obliquely downward and deflecting the optical axis upward by the deflection member to illuminate the sample. However, since the reflection angle of the deflecting member is shallow, the height from the upper surface of the stage to the bottom surface of the transmission illumination base can be reduced.

In order to achieve the above object, an invention according to claim 2 is a diffusion device that is insertable into and removable from an emission optical axis of a light source provided in a transmission illumination mount and diffuses a light beam from the light source. A first deflecting member for deflecting the optical axis of the light beam diffused by the diffusing member upward, and a sample arranged on the deflected optical axis to the sample on the transmission illumination mount from the light source. A bright-field optical system comprising a light-collecting member for condensing light, a second deflecting member for deflecting the emission optical axis of the light source upward, and a second deflecting member for reflecting the deflected light beam toward the outer periphery. 1
A reflection member, a dark-field optical system including a second reflection member that reflects the reflected light of the first reflection member inward and irradiates the sample on the transmission illumination mount with light from the light source, An optical system switching mechanism that is attached to the transmission illumination base and is capable of switching between the bright field optical system and the dark field optical system,
A stereoscopic microscope transmitted illumination device characterized by comprising:

According to the second aspect of the present invention, it is possible to switch between the dark field optical system and the bright field optical system, so that a portion common to the bright field optical system is increased, and the light emitted from the light source is efficiently used by the diffusing member. The well-condensed light can be used effectively, and as a result, the brightness can be increased, the uniform illumination can be performed, and the performance of the bright-field optical system can be improved.

According to a third aspect of the present invention, there is provided a light source disposed in a transmission illumination base such that an output optical axis is inclined obliquely downward, and a light source disposed on the output optical axis of the light source. A diffusing member that can be inserted and withdrawn and diffuses the light beam from the light source, a first deflecting member that deflects the optical axis of the light beam diffused by the diffusing member upward, and an optical axis after the deflection. A bright-field optical system including a condensing member arranged to condense light from the light source onto the sample on the transmission illumination mount; a second deflecting member for deflecting an emission optical axis of the light source upward; A first reflecting member for reflecting the deflected light beam toward the outer peripheral direction, and reflecting the reflected light beam of the first reflecting member toward the inside to reflect the light from the light source to the sample on the transmission illumination mount. A dark-field optical system comprising a second reflecting member to be illuminated, and an attachment to the transmission illumination mount Is a stereomicroscope transmitted illumination apparatus characterized by comprising a, an optical system switching mechanism capable of switching the dark field optical system and the bright-field optical system.

According to the third aspect of the present invention, the height from the upper surface of the stage on which the sample is mounted to the bottom surface of the transmission illumination base can be reduced, and the mode can be switched between bright field illumination and dark field illumination. Uniform illumination is obtained.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an overall view of a stereomicroscope according to the present invention, and includes a transmission illumination mount SK having a light / dark switching lever and a filter lever, and a volume knob R described later, a lamp house LH, a focusing unit S, and a focusing handle SH. , A lens barrel K, a lens body KB, and an interchangeable objective lens T.

FIG. 2 shows a bright field optical system which is a first example of the transmission illumination stand SK of FIG. This is the housing body 01
A light source 1 such as a halogen lamp is placed in a housing 03 composed of the base plate 02 and the bottom plate 02. The light emitting axis of the light source 1 is obliquely downward from the horizontal light emitting axis by about 5 to 10 degrees, for example, 6 degrees here. It is arranged to incline. The optical axis of the light emitted from the light source 1 is deflected upward, for example, vertically by a deflecting member 6, for example, a mirror, and a sample-mounting transparent portion 8 material, for example, a sample-mounting glass provided in an opening 01a of a housing main body 01 of the housing. The sample (specimen) 9 arranged on the (specimen mounting glass) is illuminated.

On the optical axis between the light source 1 and the deflecting member 6, a collector lens 2, filters 3a, 3b, 3c which can be inserted into and removed from the optical axis by a filter switching mechanism described later, and a diffusing member such as a diffusing plate And a resin-molded oval convex lens 5 in which the upper and lower parts of a circular lens are cut off, and a Fresnel surface 7a and a diffusion surface 7b between the deflecting member 6 and the sample mounting transparent member 8.
Is provided, and this and the deflecting member 6 are configured to be switchable by a switching mechanism described later.

In the configuration shown in FIG. 2, the light emitted from the light source 1 passes through the collector lens 2 which is arranged horizontally inclined at 6 degrees, and can be inserted and removed along the optical axis which is lowered 6 degrees forward. After being transmitted through the filters 3a, 3b, 3c disposed in the optical path, the light incident on the diffusion member 4 and diffused by the diffusion member 4 is collected by the oval convex lens 5, reflected by the deflection member 6, and deflected upward. This is incident on the Fresnel surface of the convex lens 7 and illuminates the sample 9 from the diffusion surface of the convex lens 7 through the sample mounting transparent member 8.

FIG. 3 shows a dark-field optical system according to the present invention. This includes a second deflecting member 10, for example, a mirror for deflecting the emission optical axis of the light source 1 upward, and a circular light shielding plate 1 for reflecting the deflected light beam toward the outer peripheral direction.
A first reflecting member 11 to which the first reflecting member 3 is attached, which is formed of, for example, resin and has a reflecting surface formed of aluminum and has an upwardly opened conical mirror, and reflects light reflected by the first reflecting member 11 inward. A second reflection member 12 for irradiating the light from the light source 1 to the sample mounting glass 8 provided in the opening 01a of the housing body 01 is formed of, for example, resin, and aluminum is vapor-deposited on the reflection surface, and The mirror comprises a cylindrical or conical mirror, and includes a second deflecting member 10, a first reflecting member 11, and a second deflecting member.
The reflection member 12 is configured to be switchable by an optical system switching mechanism described later. In addition, the light source 1, the collector lens 2, and the filters 3a, 3b, 3 provided in FIG.
Needless to say, an illumination system composed of c, the diffusion member 4 and the convex lens 5 is provided.

In FIG. 3, the light emitted from the light source 1 is
Through the collector lens 2 arranged at 6 degrees downward in the horizontal direction,
Thereafter, the light is condensed by the oval convex lens 5 along the optical axis that has fallen forward by 6 degrees, is reflected by the deflecting member 10 and is deflected upward, and the first reflecting member 11 deflects the light in the outer peripheral direction. The light is deflected inward and upward by the second reflection member 12 to produce annular illumination with a large opening angle, and the sample 9 is illuminated in the dark field through the sample mounting transparent member 8.

FIG. 4 shows an optical system switching mechanism.
In FIG. 3 and FIG. 3, the bottom plate 02 of the housing is removed and viewed in the direction of arrow A, where 14 indicates a dark-field optical system and 15 indicates a bright-field optical system. As described above, the dark-field optical system 14 includes the deflecting member 10, the first reflecting member 11, the second reflecting member 12, and the circular light-shielding plate 13. These have an annular mounting portion 23a at one end. Dark field side support member 2
3 are integrally connected.

The bright-field optical system 15 comprises the diffusing member 4, the deflecting member 6, and the second convex lens 7 as described above, and these have a bright-field-side support having an annular mounting portion 22a at one end. The members 22 are integrally connected.

A cylindrical shaft 20 is vertically fixed near one end of the housing body 01 and on the side opposite to the light source 1. A long hole for driving the lever (a hole long in the direction of the paper surface in FIGS. 1 and 2) 01 b is formed on a side surface of the housing main body 01 where the shaft 20 exists. The mounting portion 22 a of the bright field side support member 22 is rotatably inserted into the shaft 20. Further, a lever 21 having an annular mounting portion 21a at one end and a grip portion 21b at the other end is provided on the shaft 20.
And the grip 21b is inserted into the elongated hole 01b. A mounting portion 23 a of the dark-field-side support member 23 is rotatably inserted into the shaft 20. Then, the mounting portion 21a of the lever 21 and the bright field side support member 2
2 mounting section 22a and mounting section 2 of dark field side support member 23
Reference numeral 3a is integrally fixed by a fixing member (not shown). As a result, the grip 21b of the lever 21 is
4, the dark-field optical system 14 is positioned at the solid line position in FIG. 4, that is, at the optical axis (the bright-field optical system 15 is rotated by approximately 45 degrees from the optical axis), and the lever 21 is moved.
Is rotated to the position indicated by the two-dot chain line along the long hole 01b, the bright-field optical system 15 is positioned at the optical axis (the dark-field optical system 14 is rotated approximately 45 degrees from the optical axis). I do.

Referring to FIG. 5, filters 3a, 3b, 3c
Will be described. FIG. 5 is a view in which the bottom plate 02 of the housing is removed in FIGS.
The filters 3a, 3b, 3c are normally arranged so as to be orthogonal to the optical axis (in a state inclined at a predetermined angle, for example, 6 degrees with respect to the horizontal optical axis), and the filters 3a, 3b, 3c are respectively provided on the support arms 04a, 04b, 04c. Supported by one end,
The other ends of the support arms 04a, 04b, 04c are
Vertical axes 16a, 16b, 16c respectively fixed to 1
Is rotatably supported. An operation shaft 17 is provided on the housing main body 01 so as to be able to move in and out of a predetermined stroke corresponding to each of the support arms 04a, 04b, and 04c.
Pins 05a, 05 are provided at one end of each operation shaft 17, respectively.
b, 05c (only 05c is shown in the figure) is fixed, and each pin is a long hole 04ah, 04bh, 04ch formed in each support arm 04a, 04b, 04c (only 04ch is shown in the figure). Each). As a result, when one of the operation shafts 17 (connected to the support arm 04c) is pulled out to the position indicated by the two-dot chain line, the pin 05c moves along the long hole 04ch and the support arm 04c is moved to the vertical shaft 16c. When the filter 3c moves to the position indicated by the two-dot chain line, that is, the position deviated from the optical axis, and conversely, returns the operation shaft 17 from this position to the solid line position. Move to a position that matches the axis. This operation is performed by the filter 3c, but the other filters 3a and 3b can be similarly switched by moving the operation shaft 17 in and out.

According to the embodiment described above, the following operation and effect can be obtained. That is, as shown in FIG. 2, in the bright-field optical system, the light from the light source 1 is tilted 6 degrees downward from the horizontal direction (horizontal optical axis) by the collector lens 2 and 6 degrees from the horizontal direction.
It emits light that is substantially parallel along the optical axis in the downward direction. The height of the light source 1 cannot be extremely low due to the height of the halogen lamp, the position of the lamp socket, and the heat radiation design, and requires a certain height. Along the optical axis, the filters 3a,
3b and 3c are arranged, the light is incident on the diffusion plate 4, and the diffusion plate 4 is incident on the oval convex lens 5 as a secondary light source having a large area.

The diffusing member 4 greatly contributes to the determination of the illumination visual field, and can cover a wide illumination visual field by increasing the degree of diffusion and a narrow illumination visual field by decreasing the degree of diffusion. The large-sized convex lens 5 needs a large diameter in order to increase the numerical aperture in the left-right direction required for the illumination of the stereomicroscope. To keep the required amount. Thereby, a small optical system can be assembled in the vertical direction.

The deflecting member 6 reflects the incident and outgoing light at 84 degrees, that is, at 42 degrees with respect to the mirror surface normal as shown in FIG. Can be arranged in any way. If the required beam diameter is φ40,
As shown in FIG. 6A, the height is 4 compared to the 45-degree reflection.
0−40 × tan42 ° = 4, and the thickness can be reduced by 4 mm. The light reflected by the mirror 6 and directed upward is converted into a convex lens 7.
The light is deflected in the converging and converging directions, and is diffused by the integrally formed diffusing surface to illuminate the sample 9.

The effect of changing the degree of diffusion of the diffusion plate 4 can be obtained by inserting and removing the diffusion plate with the filter 3a, and the illumination visual field can be controlled. By making the second convex lens 7 a Fresnel lens, an economically large lens can be made thin and the diffusion of the diffusion plate 4 can be strengthened to produce a large divergent light, and the second convex lens 7 bends the light in the convergent direction. By passing through the diffusion surface, the illumination field of view of φ60 to φ70 can be secured, while the illumination field of view of the ordinary stereomicroscope apparatus is about φ35. Almost four times the area can be illuminated.

Next, as shown in FIG. 3, in the dark-field optical system, the diffusing member 4 is removed, and the light that has not been diffused is converged by the oval convex lens 5 and is incident on the reflecting member 11 by the small deflecting member 10. Is deflected in the outer circumferential direction. All the light collected by the collector lens 2 goes to the outer peripheral direction. Light directed in the outer peripheral direction is reflected inward and upward by the reflection member 12 to realize dark field illumination. The circular light-shielding plate 13 blocks light leaking from below and darkens the background of the dark field.

The height of the filters 3a, 3b and 3c does not change because they are retracted from the optical axis in the horizontal direction. Further, the filter switching mechanism connects the operation shaft 17 to the support arms 04a, 04b,
Since the connection is made at 04c, the amount of pulling out the lever is small.

By these functions, the height from the upper surface of the stage on which the sample is placed to the bottom surface of the transmission illumination mount is extremely low due to the inclination of the optical axis, the use of the Fresnel lens 7, the integration of the diffusion member 5, and the like. Thin).

Further, even when switching to either the bright-field optical system or the dark-field optical system, both the bright-field optical system and the dark-field optical system can use all the light taken in by the collector lens 2 without waste. Bright and uniform illumination can be efficiently performed. A very large field of view can be illuminated by providing a diffusion surface on the final surface of a bright field, in which the illumination optical path can be lengthened and a wide field of view can be illuminated with less unevenness while including a dark field illumination system. Further, the use of the Fresnel lens hardly increases the thickness of a large lens. By inserting and removing the diffuser, the range of the field of view can be controlled, and bright illumination can be achieved when the field of view is narrow.

Furthermore, even if the filters 3a, 3b, 3c are incorporated, the optical axis can be configured to support a large number of filters in a compact manner without changing the height.
This is because the filters 3a, 3b, and 3c have different positions in the height direction because they are tilted by degrees, which is very convenient. As shown in FIG. 7, the amount of protrusion of the operation shaft 17 of the filter switching mechanism is small and does not hinder the work. FIG. 7A shows the operation axis 1.
7, the filter 3a, 3b, 3
FIG. 7B shows a state in which the operating shaft 17 is removed, that is, the filters 3a, 3b, 3
This is a state where c has been removed from the optical axis.

According to the first embodiment described above, the following effects can be obtained. 1) The height of the housing, that is, the dimension from the sample mounting surface to the bottom surface can be reduced without reducing the field of view that can illuminate the transmission illumination device.

2) In actual designing, the upper surface of the transparent member on which the sample is placed on the gantry can be made wide and thin. 3) It is possible to incorporate filters 3a to 3c so that the illumination can be changed without moving the sample 9 and not to affect the thickness of the apparatus.

4). In the dark field illumination system, the light beam emitted from the light source 1 can be used without waste, and bright illumination can be performed. In the bright-field optical system 15, since the optical path can be designed to be long, a wide illumination field with less unevenness can be obtained without difficulty. Since each of them can be switched, a preferable illumination method for the bright-field optical system and the dark-field optical system can be easily selected. It is bright during dark-field observation and can be evenly illuminated during bright-field observation.

5) With only one switching operation, illumination can be made bright during dark-field observation and can be illuminated evenly during bright-field observation. 6) By switching the optical system by rotating in the horizontal direction, the device can be configured (thinned) without increasing the thickness of the device.

7) Since a lens having a large diameter can be made thin, the apparatus can be made thin and inexpensive. 8) Since two optical elements can be made into one, the apparatus can be made thin. A large illumination field of view with little unevenness and a large numerical aperture can be realized.

9) By illuminating a large visual field by increasing the diffusion angle, it is possible to avoid insufficient peripheral light quantity. (Second Embodiment) A second embodiment of the present invention will be described with reference to the drawings. FIG. 8 shows a bright-field optical system which is a second example of the illumination stand SK of FIG. Light emitted from a light source 1 such as a halogen lamp passes through a collector lens 2 arranged at 10 degrees downward in the horizontal direction, and filters 3a, 3
After passing through b and 3c, the light is incident on the first diffusion plate 4, and the light diffused by the first diffusion plate 4 is condensed by an oval convex lens 5 formed of a resin having a circular upper and lower portion. The light is reflected by the mirror 6 through the second diffusion plate 18 and deflected upward, enters the convex lens 19, and illuminates the sample 9 through the sample mounting glass 8.

The dark-field optical system of this embodiment is the same as that of the first embodiment, and is configured as shown in FIG. Light emitted from a light source 1 such as a halogen lamp passes through a collector lens 2 arranged at 6 degrees downward in the horizontal direction, and is formed of a resin that is cut vertically upward and downward along an optical axis that is 6 degrees down. Mirror 1 condensed by an oval convex lens 5
The first conical mirror 11 which is reflected by the first mirror and is deflected upward, is formed of resin and plated, and is opened upward.
Deflects the light in the outer peripheral direction with the second conical mirror 12 formed of resin and plated integrally with the first conical mirror 12
The light is deflected inward and upward to produce annular illumination having a large aperture angle, and the sample 9 is illuminated in the dark field through the sample mounting glass 8.
On the first conical mirror 11, a circular light shielding plate 13 is arranged.

FIG. 9 shows a bright-field optical system 15 and a dark-field optical system 1.
4 shows a switching mechanism. As described above, the dark-field optical system 14 includes the mirror 10, the first conical mirror 11, the second conical mirror 12, and the circular light-shielding plate 13, which are provided at one end with an annular mounting portion 23a. Are integrally connected by a dark field side support member 23 having

The bright-field optical system 15 comprises the first diffuser 4, the second diffuser 18, the mirror 5, and the second convex lens 19 as described above. They are integrally connected by a bright field side support member 22 having a portion 22a.

The bright field side support member 22 of the bright field optical system 15
And the dark-field support member 23 of the dark-field optical system 14 are rotatably connected to a vertical axis 20 fixed to the housing body 01, and the bright-field support member 22 and the dark-field support member Reference numeral 23 is integrally connected to the lever 21, and switching between the bright field optical system 15 and the dark field optical system 14 is possible by switching the lever 21.

FIG. 10 is a view showing a filter insertion / removal mechanism, in which filters 3a, 3b, and 3c are arranged along the optical axis, and are arranged obliquely with respect to the horizontal optical axis. , 3b, 3c are support arms 04, respectively.
a, 04b, and 04c are supported by one end of
The other ends of 4a, 04b and 04c are rotatably connected to vertical shafts 16a, 16b and 16c fixed to the housing body 01, respectively. Rotation knobs 25 are attached to the housing main body 01 so as to be rotatable from the outside, and shafts 16a, 16b, 1 perpendicular to the rotation knobs 25 are respectively provided.
6c are connected by a ring-shaped belt 24, and the filters 3a, 3b, 3c
Is configured to be switchable between a two-dot chain line position and a solid line position.

In the bright field, the configuration is the same as that of the first embodiment until the diffuser 4 is incident on the oval convex lens 5 as a secondary light source having a large area in the bright field. The diffusion plate 4 greatly contributes to determining the illumination visual field, and can cover a wide illumination visual field when the diffusion degree is increased, and a narrow illumination visual field when the diffusion degree is reduced. The oval convex lens mirror 6 can be arranged so that the incident light and the outgoing light are reflected at 80 degrees, that is, at 40 degrees with respect to the mirror surface normal in order to deflect the optical axis inclined at 10 degrees vertically. When the required light beam diameter is 40, the height becomes 40−40 × tan 40 ° = 6.4 as compared with the reflection at 45 °, and the thickness can be reduced to 6.4 mm. The light reflected by the mirror 6 and directed upward is condensed by the convex lens 7 and deflected in the convergence direction.

By making the lens into an oval shape with a circular upper and lower portion, the lens can be enlarged only in the left-right direction that requires a large numerical aperture, and the illumination device can be made thinner by reducing the size in the up-down direction.

Next, the dark-field optical system is the same as in the first embodiment, and a description thereof will be omitted. By these actions, the illumination device can be formed thin by tilting the optical axis. Further, even if the filters 3a, 3b, 3c are incorporated, the configuration can be made without changing the height, which is very convenient. The illumination optical path can be lengthened while including a dark-field illumination system, so that illumination can be performed without unevenness in the visual field and with a large numerical aperture. Both bright field and dark field can use all the light taken in by the collector lens without waste, so efficient bright illumination is possible.

(Modification) In the above embodiment, the light source 1
The case where the inclination angle of the emission optical axis is 6 degrees and 10 degrees has been described. According to the experimental results, if the inclination angle is about 5 degrees to 10 degrees, the same operation and effect as in the above-described embodiment can be obtained. If the inclination angle of the output optical axis of the light source 1 is too small (unless the angle is set), there is no effect, and if the inclination angle of the output optical axis of the light source 1 is too large (the angle is set too much), the illuminating light beam is placed on the sample. The sample mounting transparent member is restricted at a position higher than the upper surface of the transparent member.

The conical mirrors 11 and 12 of the dark-field optical system according to the above-described embodiment may condense and diverge by, for example, making a cylinder or a section a curved line. , 12 may be made of metal.

Further, the bright-field optical system is not limited to the embodiment described above, and can be arbitrarily combined. A gear may be used instead of the belt 24 of the filter insertion / removal mechanism in FIG. Naturally, a Fresnel lens having a diffusing surface integrally formed can be used as long as the normal lens allows the thickness to be increased, and the same applies to separating the diffusing plate and the lens.

Although the present invention has been described with respect to claims 1 to 3, the following claims are also included. [4] A light source in a transmission illumination mount is disposed such that an emission optical axis of the light source is inclined obliquely downward, and the transmission optical mount is deflected by deflecting the output optical axis upward with a deflecting member. A stereomicroscope transmission illumination device for illuminating a sample disposed thereon, wherein a tilt angle at which an emission optical axis of the light source is inclined obliquely downward is about 5 to 10 degrees.

[Claim 5] A diffusing member which can be inserted into and removed from an emission optical axis of a light source provided in the transmission illumination mount and diffuses a light beam from the light source is rotatably supported by a vertical axis. A filter is rotatably arranged on the vertical axis,
Thus, a stereomicroscope transmission illumination device comprising an insertion / removal mechanism for the diffusion member and the filter.

[Claim 6] An illuminating device for a stereomicroscope using an oval lens whose upper and lower parts are cut off from a circular lens as a light-collecting member provided in a bright-field optical system.

[Claim 7] The illumination device for a stereo microscope according to claim 6, wherein the oval lens is formed by resin molding.

[8] The transmission and illumination apparatus for a stereomicroscope according to [3], wherein the insertion and removal of the diffusion member is interlocked with the optical system switching mechanism.

[Claim 9] The transmission illumination apparatus for a stereomicroscope according to claim 3, wherein the optical system switching mechanism is rotatable about a vertical axis fixed in a transmission illumination mount.

[Claim 10] The light-collecting member of the bright-field optical system is a Fresnel lens.
A transmission illumination device for a stereomicroscope as described in the above.

[Claim 11] The transmission illumination apparatus for a stereomicroscope according to claim 3, wherein the light-collecting member of the bright-field optical system and the diffusion member are integrally formed.

[0060]

According to the present invention, the height from the upper surface of the sample mounting transparent member on which the sample is mounted to the bottom surface of the transmission illumination base can be reduced, and it can be applied to either the bright field optical system or the dark field optical system. It is possible to provide a stereoscopic microscope transmission illuminating device capable of obtaining uniform illumination even when switching is performed, and simultaneously obtaining both of these effects.

[Brief description of the drawings]

FIG. 1 is an external view of a stereo microscope for explaining a schematic configuration of the present invention.

FIG. 2 is a cross-sectional view mainly showing a bright-field optical system for explaining a first embodiment of the stereomicroscope transmission illumination device of the present invention.

FIG. 3 is a cross-sectional view mainly showing a dark-field optical system for describing a first embodiment of a stereomicroscope transmission illumination device of the present invention.

FIG. 4 is a diagram showing an optical system switching mechanism for explaining a first embodiment of the stereoscopic microscope transmission illumination device of the present invention.

FIG. 5 is a diagram showing a filter switching mechanism for explaining a first embodiment of the stereomicroscope transmission illumination device of the present invention.

FIG. 6 is a diagram for explaining the operation and effect of the first embodiment of the stereomicroscope transmission illumination device of the present invention.

FIG. 7 is a view for explaining the operation and effect of the first embodiment of the stereoscopic microscope transmission illumination device of the present invention.

FIG. 8 is a cross-sectional view mainly showing a bright-field optical system for describing a second embodiment of the stereomicroscope transmission illumination device of the present invention.

FIG. 9 is a diagram showing an optical system switching mechanism for explaining a second embodiment of the stereoscopic microscope transmission illumination device of the present invention.

FIG. 10 is a diagram showing a filter switching mechanism for explaining a second embodiment of the stereomicroscope transmission illumination device of the present invention.

FIG. 11 is a diagram illustrating a problem in a first example of a conventional stereomicroscope illumination device.

FIG. 12 is a diagram for explaining a problem in a second example of a conventional stereomicroscope illumination device.

[Explanation of symbols]

 Reference Signs List 01 housing main body 02 bottom plate 03 housing 1 light source 2 collector lens 3a, 3b, 3c filter 4 diffusion member 5 convex lens 6 deflection member 7 diffusion member 8 sample transparent member 9 Sample 10: Deflection member 11: Reflection member 12: Reflection member 13: Circular light shielding member 14: Dark field optical system 15: Bright field optical system 16a, 16b, 16c: Vertical axis 17: Operation axis 20: Axis 21: Lever 22 ... bright field side support member 23 ... dark field side support member

Claims (3)

[Claims] 1. A light source in a transmission illumination mount is disposed such that an emission optical axis of the light source is inclined obliquely downward, and the emission optical axis is deflected upward by a deflecting member to deflect the optical axis. A stereomicroscope transmission illuminator, which illuminates a sample placed thereon. 2. A diffusing member which can be inserted into and removed from an emission optical axis of a light source provided in a transmission illumination mount and diffuses a light beam from the light source, and an optical axis of the light beam diffused by the diffusing member. Bright-field optical system comprising: a first deflecting member for deflecting light upward, and a condensing member arranged on the optical axis after the deflection and for condensing light from the light source onto a sample on the transmission illumination mount. A second deflecting member for deflecting the emission optical axis of the light source upward, a first reflecting member for reflecting the deflected light beam toward an outer peripheral direction, and a reflection of the first reflecting member. A dark-field optical system comprising a second reflecting member for reflecting light rays inward and irradiating the sample on the transmission illumination base with light from the light source; and a bright-field optical system attached to the transmission illumination base. And an optical system switching mechanism capable of switching the dark field optical system, Stereomicroscope transmission illumination apparatus characterized. 3. A light source disposed in a transmission illumination base such that an emission optical axis is inclined obliquely downward, and a diffusion that can be inserted into and removed from the emission optical axis of the light source and diffuses a light beam from the light source. A first deflecting member for deflecting the optical axis of the light beam diffused by the diffusing member upward; and a sample arranged on the optical axis after the deflection and on the transmission illumination mount to receive a sample from the light source. A bright-field optical system including a light-collecting member for condensing light, a second deflecting member for deflecting the emission optical axis of the light source upward, and a second deflecting member for reflecting the deflected light beam toward an outer peripheral direction. A dark field optical system comprising: a first reflecting member; and a second reflecting member that reflects the reflected light of the first reflecting member inward and irradiates the sample on the transmission illumination mount with light from the light source. , Mounted on the transmission illumination base and disconnecting the bright-field optical system and the dark-field optical system. An optical system switching mechanism capable example, stereomicroscope transmission illumination apparatus characterized by comprising a.