JPS6227691B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an endoscope suitable for taking endoscopic photographs.

Conventionally, the method of measuring the size of an ulcer or foreign object inside a body cavity is to bring a measurement sonde or measurer to the vicinity of the ulcer, etc. inside the body cavity, to capture these within the observation field, and to compare them. It was used to measure the distance to and the size of the object. However, all of these conventional methods require complicated and expensive instruments, and the handling operations for guiding the instruments into the body cavity are cumbersome. Furthermore, disinfection and post-treatment before use of the instruments are troublesome. It was hot. In addition, inserting instruments into body cavities is expected to have adverse effects on the human body, and careless increases in the types and number of instruments should be avoided as much as possible due to safety concerns.

The present invention has been made focusing on the above circumstances,
The purpose is to make it possible to easily measure the distance to a photographed subject using an endoscopic photograph taken using this endoscope.

Embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 in FIG. 1 is a rigid endoscope, which has an eyepiece 3 attached and fixed to the proximal end of an insertion section 2, and an observation optical system and an illumination optical system are provided inside the endoscope. The observation optical system includes a relay lens 4 that guides an optical image in the field of view seen from the tip of the insertion section 2 to the eyepiece section 3 side.
... and an eyepiece 5, the eyepiece 5
constitutes an eyepiece optical system 6.

The eyepiece 3 of the rigid endoscope 1 is adapted to be fitted with a focusing adapter 7 which is attached when taking a photograph. A camera 8 is attached to this photography adapter 7. A photographic lens 9 is provided in the photographic adapter 7, and this photographic lens 9
By moving the lens in the optical axis direction, an image is formed on a film 10 within the camera 8.

Further, a field mask 11 is provided within the eyepiece section 3 of the rigid endoscope 1, located in the imaging range Z of the eyepiece optical system 6. This field mask 11 is formed by forming a transparent hole 13 in a disk 12, and this is fixedly attached to a lens frame 14 of an eyepiece lens 5, as shown in FIG. Furthermore, the visual field mask 11
As shown in FIG. 4, an indicator 15 is formed protruding from the upper edge of the opening to indicate the direction of the field of view. Furthermore, a plurality of through holes 16 are arranged in a row around the openings of the through holes 13 of the field mask 11 by circularly perforating each of the disks 12. The inner diameters of the through holes 16 are sequentially increased in order from the one closest to the index 15 to the one furthest from the index 15.
That is, each of the through holes 16 is formed on the mask surface of the visual field mask 11, has stepwise dimensions, and constitutes a plurality of identification portions that transmit light.

Next, a case will be described in which the rigid endoscope 1 is used to photograph the subject 17 inside the body cavity.

First, as shown in FIG. 1, a photography adapter 7 is attached to the eyepiece 3 of the rigid endoscope 1, and a camera 8 is attached to the photography adapter 7. Then, the photographing lens 9 of the photographing adapter 7 is moved and adjusted in the optical axis direction (y direction) according to the distance x from the tip of the insertion section 2 to the subject 17,
An observation visual field image is formed on a film 10 of a camera 8. In this way, the observation field image can be formed on the film 10 of the camera 8, but the image formation position in the eyepiece optical system 6 is determined by the distance x to the subject 17.
It is located somewhere within the imaging range Z depending on. At this imaging position, the field mask 11, the index 15 formed on the mask surface, and the through hole 16...
are respectively imaged on the film 10. However, at this time, not all of the through holes 16 are photographed clearly, but they change depending on the position of the photographing lens 9 of the photographing adapter 7, and the closer the photograph is taken, the smaller the diameter becomes. It disappears. Therefore, the distance to the subject 17, which is optically known in advance from the number of remaining through holes 16 or the distance from the index 15, can be easily measured from the photographed photograph. Further, the photographing magnification at that distance x can be similarly known. In other words, the distance x to the subject 17 and its magnification can be immediately determined from the photograph taken.

Incidentally, FIGS. 5 to 7 each show a modification of the identification section provided on the visual field mask 11. That is, FIG. 5 shows a rectangular slit 18...
This is the case when it is formed by Figures 6 and 7
The figures are constructed by forming an uneven shape, and in particular, the recesses 19 in FIG. 6 and the convex portions 20 in FIG. 7 are identified. That is, the identification section of the present invention is provided with a plurality of identification sections having different spatial frequencies and having size differences such as transmission area and width, and distinguishes the subject 1 according to the degree of blur of the identification section.
7 and the imaging magnification at that position.

As explained above, by taking endoscopic photographs using the endoscope of the present invention, there is no need to use special equipment, and the distance and size of the subject can be easily determined from the endoscopic photographs. be able to. Furthermore, it is possible to measure the inside of the body cavity, that is, regardless of the location or shape of the subject. Furthermore, since there is no need to separately prepare special equipment, it is safe, and sterilization is sufficient just by sterilizing the endoscope. In addition, a field mask is provided on the optical axis in the imaging range of the eyepiece optical system, and a plurality of identification portions that are different in size and transmit light in stages are provided on the mask surface of this field mask, and any one of the field masks is provided. Since it is designed to project, it can be constructed compactly without providing many members.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural explanatory diagram showing an embodiment of the present invention, FIG. 2 is a side sectional view of the eyepiece of the rigid endoscope, and FIG. 3 is a side sectional view of the eyepiece and photography. FIG. 4 is an explanatory diagram of the optical system of the adapter, FIG. 4 is a diagram showing the shape of a field mask, and FIGS. 5 to 7 are diagrams showing the shape of each field mask in other embodiments of the present invention. 1... Rigid endoscope, 3... Eyepiece, 5... Eyepiece, 6... Eyepiece optical system, 7... Photography adapter, 9... Photography lens, 10... Film,
11...Visual field mask, 13...Transmission hole, 16...
Through hole, 17...Subject, 18...Slit, 19
...concavity, 20...protrusion.

Claims (1)

[Scope of Claims] 1. An eyepiece section in which the eyepiece optical system is composed of a lens system,
In an endoscope that takes photographs by attaching a camera via a focusable photography adapter,
An endoscope characterized in that the eyepiece optical system is provided with a field mask that performs a field stop, and a mask surface of the field mask is provided with a plurality of identification parts that have stepwise dimensions and that transmit light. 2. Claim 1, wherein the identification portion is formed around the opening of the transmission hole of the field mask.
The endoscope described in section. 3. The endoscope according to claim 1, wherein the identification portion is a through hole. 4. The endoscope according to claim 1, wherein the identification portion is a slit. 5. The endoscope according to claim 1, wherein the identification portion is an uneven shape formed on the periphery of the opening of the field mask.