JP2591735Y2 - Video microscope observation probe - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an observation probe for medical or industrial use, and more particularly to an observation probe of a video microscope capable of illuminating a subject and changing magnification.

[0002]

2. Description of the Related Art In a normal camera, as a means for converting the magnification of a lens system, an auxiliary lens is provided on the front surface of the lens system, or a bellows is provided on the rear surface of the lens system so that the distance between the lens and the film surface is increased. Methods such as changing the distance are known. FIG. 4 shows an example of a conventional configuration in which an auxiliary lens for converting a magnification is provided in an observation probe of a video microscope provided with a solid-state imaging device (hereinafter referred to as a CCD). In FIG. 4, an auxiliary lens 2 having an outer diameter substantially equal to the outer diameter of the imaging lens system 1 for increasing the magnification is provided on the front surface of the imaging lens system 1. On the rear surface of the imaging lens system 1, a CCD 4 for receiving an image of the subject 3 formed by the imaging lens system 1 is arranged. Further, on the optical axis between the imaging lens system 1 and the auxiliary lens 2,
An aperture 5 for increasing the depth of focus is provided.

To observe the subject 3, it is necessary to illuminate the subject 3. For this reason, about 120 optical fibers 6 as a light guide member having a diameter of, for example, 0.5 mm are concentrically arranged on the outer periphery of the imaging lens system 1. Light emitted from a light source (not shown) is guided to the optical fiber 6 and emitted to the front side,
The light is reflected by reflecting mirrors 7 and 8 provided concentrically inside and outside the outer periphery of the front surface of the imaging lens system 1 to illuminate the subject 3.

[Problems to be solved by the invention]

However, according to the observation probe of the conventional video microscope shown in FIG. 4, the illumination light reaches the position of the normal subject 3a when the auxiliary lens 2 is not provided, but the auxiliary lens 2 is provided. There is a problem that the illumination light does not sufficiently reach the position of the subject 3 when the magnification is increased because the reflecting mirrors 7 and 8 and the case 9 of the auxiliary lens 2 block the optical path.

On the other hand, if the diaphragm 5 is omitted, the depth of focus cannot be adjusted, and light rays distant from the optical axis enter the imaging lens system 1, so that the image is affected by aberration of the imaging lens system, and There was a problem of blurring.

The present invention has been made in view of such a point, and is suitable for observing a video microscope which can illuminate a subject satisfactorily and convert a lens magnification easily, has little aberration and has a large depth of focus. It is intended to provide a probe.

[0007]

In order to achieve the above object, the present invention according to the present invention provides an image pickup lens system for forming an image of a subject on a CCD and a front surface of the image pickup lens system. An auxiliary lens that is provided coaxially and converts magnification, and a light guide member that is provided along an outer periphery of the imaging lens system and guides light for illuminating the subject, and an outer diameter of the auxiliary lens. Is equal to the outer diameter of the light guide member, and the auxiliary lens is
It is characterized by being detachable .

According to a second aspect of the present invention, a stop is provided between the imaging lens system and the auxiliary lens.

[0009]

According to the first aspect of the present invention, the outer diameter of the auxiliary lens is made equal to the outer diameter of the light guide member provided on the outer circumference of the imaging lens system. The emitted light can sufficiently illuminate the subject through the auxiliary lens.

According to the second aspect of the present invention, since the stop is provided between the imaging lens system and the auxiliary lens, the light passes substantially on the optical axis and the aberration is reduced. And the depth of focus of the lens system can be increased.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the observation probe of the video microscope of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show the configuration of an embodiment of the present invention. In these figures, portions corresponding to those of the conventional example shown in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. This embodiment is characterized in that an auxiliary lens 2 having an outer diameter substantially equal to the outer diameter of the main body 10 is provided on the front surface of the main body 10 of the observation probe that houses the optical fiber 6. Further, between the front surface of the imaging lens system 1 provided at the center of the main body 10 and the auxiliary lens 2, a diaphragm 5 shown in FIG.
Are provided on the optical axis. The aperture 5 is supported at the center of the ring 11 via three columns 12. Reference numeral 13 shown in FIG. 1 is a CCD assembly that houses the CCD 4,
Reference numeral 14 denotes a signal line for transmitting a signal from the CCD 4 to the outside.

Next, the operation of this embodiment will be described with reference to FIG. Illumination light emitted from a light source (not shown)
, And is reflected by the reflecting mirrors 7 and 8 to enter the auxiliary lens 2. And the illumination light is the auxiliary lens 2
Illuminates the subject 3 by being refracted toward the optical axis. At this time, the image of the subject 3 is magnified by the auxiliary lens 2 and is incident on the imaging lens system 1. The subject 3 is close to the auxiliary lens 2, but is sufficient for the auxiliary lens 2 to collect the illumination light. Can be illuminated.

Further, since the stop 5 is provided on the optical axis between the auxiliary lens 2 and the imaging lens system 1, the aberration of the lens system is reduced and the depth of focus is increased. At this time, the amount of light incident on the imaging lens system 1 from the subject 3 is reduced by the aperture 5, but since the subject 3 is sufficiently illuminated with the illumination light, the decrease in the amount of light can be minimized.

The diameter and the number of the optical fibers 6 shown in the above embodiment are merely examples, and are not limited thereto. Further, the support structure of the diaphragm 5 shown in FIG. 2 is not limited to this.

[0016]

As described above, according to the observation probe of the video microscope according to the first aspect, the outer diameter of the auxiliary lens is made equal to the outer diameter of the light guide member. The subject can be sufficiently illuminated even when the size is increased.

According to the second aspect of the present invention, since the diaphragm is provided between the imaging lens system and the auxiliary lens, the aberration of the auxiliary lens can be reduced and the depth of focus can be increased. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an embodiment of an observation probe of a video microscope of the present invention.

FIG. 2 is a front view showing the configuration of the stop shown in FIG. 1;

FIG. 3 is an explanatory diagram illustrating the operation of the present embodiment.

FIG. 4 is an explanatory diagram showing a configuration of an example of a conventional observation probe of a video microscope.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 imaging lens system 2 auxiliary lens 3 subject 4 CCD (solid-state imaging device) 5 stop 6 optical fiber (light guide member)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-148718 (JP, A) JP-A-63-168614 (JP, A) JP-A-2-59710 (JP, A) 119814 (JP, U) Shokai 63-54118 (JP, U) Shokai 56-75909 (JP, U) JP-B 47-23224 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) G02B 21/00-21/36 G02B 23/24-23/26 A61B 1/00-1/32 H04N 5/222-5/257 G01N 21/84-21/91

Claims (2)

(57) [Scope of request for utility model registration] 1. An imaging lens system for forming an image of a subject on a solid-state imaging device, an auxiliary lens provided coaxially on a front surface of the imaging lens system for converting magnification, and an outer periphery of the imaging lens system. illuminating the subject is provided Te in the observation probe that includes a light guide member for guiding light, the outer diameter of the auxiliary lens equal to the diameter of the outer circumference of the light guide member, before
The auxiliary lens is detachably attached to the imaging lens system.
The video microscope observation probe, characterized in that. 2. The observation probe for a video microscope according to claim 1, wherein an aperture is provided between the imaging lens system and the auxiliary lens.