JPS6227690B2 - - 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 endoscopic photographs 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 section 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.

Furthermore, within the eyepiece section 3 of the rigid endoscope 1, there are a plurality of field masks 11 located in the imaging range Z of the eyepiece optical system 6 and offset from each other on the optical axis l to perform a field stop. It is provided. The above-mentioned field masks 11... have shape differences that are distinguishable from each other as shown in FIG. has been done. That is, each field mask 11 is composed of a circular plate 14 in which a circular transmission hole 13 of the same diameter is formed, and an index 15 protruding from the upper edge of the opening of each hole 13 is formed to indicate the direction of the field of view. ing. Further, next to the index 15, a mask identification index 16 is formed protrudingly, and the mask identification index 1 of each field mask 11 is formed.
The number of 6... is different for each. In other words,
The number of field masks 11 on the distal end side is sequentially decreased. For example, when five field masks 11 are provided, they are sequentially reduced to 4, 3, 2, and 1 starting from the furthest one, as shown in Figure 4 A, B, C, D, and E. The one in the foreground has mask identification index 1
6 may be omitted.

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

First, the photography adapter 7 is attached to the eyepiece section 3 of the rigid endoscope 1, and the 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) in accordance with the distance x from the tip of the insertion section 2 to the subject 17, and the observation field image is focused on the film 10 of the camera 8. image. In this way, the observation field image can be formed on the film 10 of the camera 8, but the image forming position in the eyepiece optical system 6 is determined by the image forming range Z depending on the distance x to the subject 17.
It is in one of the following. The closer the visual field mask 11 is to this imaging position, the clearer the photograph is taken.
This clearly imaged mask identification index 16...
By counting the number of...
can be identified. Therefore, the distance x from the specified position of the field mask 11 to the subject 17 can be measured. That is, if the magnification on the film 10 and the distance x to the subject 17 corresponding to the imaging position of each of the field masks 11 are checked in advance, the magnification and the distance x can be immediately determined.

In the above embodiment, the mask identification index 1 protrudes from the edge of the transparent hole 13 of the field mask 11.
Although the field masks 11 can be identified from each other by providing the visual field masks 6, the means for identifying is not limited to this, and may be a cutout, a protrusion, a combination thereof, or the like. Furthermore, Figure 5 A, B,
As shown by C, D, and E, each field mask 18 has a scale 20 with graduations 19 at different intervals.
may be provided. Incidentally, each scale 20 can be formed on a thin transparent plate 21 by means such as etching stamping. Further, each scale 20... is displayed to indicate the magnification at the position of the field mask 18... and to indicate the distance x to the subject. In this embodiment, the scale 20 of one of the field masks 18 appears clearly depending on the distance x to the subject 17, and this scale 2
By reading 0..., it is possible to know the distance x to the subject 17 and the magnification. Also, film 1
The size of the subject 17 can be visually measured on the 0 plane.

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 prepare any special equipment, it is safe, and sterilization is sufficient just by sterilizing the endoscope. In addition, since the field masks are provided offset from each other on the optical axis in the imaging range of the eyepiece optical system and one of the field masks is projected, a clear field mask image is obtained and easy to distinguish.

[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. Explanatory diagram of the optical system of the adapter, Figure 4 A,
B, C, D, and H are diagrams showing the shape of each field mask, respectively, and FIG. . 1... Rigid endoscope (endoscope), 3... Eyepiece,
6... Eyepiece optical system, 7... Photography adapter,
11... Visual field mask, 16... Mask identification index, 18... Visual field mask, 20... Scale.

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 plurality of distinguishable field masks for forming a field diaphragm, which are offset from each other on the optical axis of an imaging range of a subject. 2. Claim 1, characterized in that the field masks have shape differences that are distinguishable from each other.
The endoscope described in section. 3. The endoscope according to claim 1 or 2, wherein each of the field masks is provided with a directly readable scale on the same surface thereof.